CN102288209B - Method for positioning rotating position of character wheel and metering device thereby - Google Patents
Method for positioning rotating position of character wheel and metering device thereby Download PDFInfo
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- CN102288209B CN102288209B CN201010206683.8A CN201010206683A CN102288209B CN 102288209 B CN102288209 B CN 102288209B CN 201010206683 A CN201010206683 A CN 201010206683A CN 102288209 B CN102288209 B CN 102288209B
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Abstract
The invention relates to a method for positioning the rotating position of a character wheel and a metering device thereby. The metering device with an optical sensing counting character wheel comprises at least one group of character wheel assembly, wherein the character wheel assembly comprises a character wheel bracket, a cylindrical character wheel body and a microprocessor unit (MCU); and each group of optical sensor assembly comprises an optical receiving pipe as well as a first optical emitting pipe and a second optical emitting pipe with emitting light rays over against the optical receiving pipe. The optical sensor assembly outputs four state signals which are applied in the same coding design; the number of the optical sensor assembly is smaller than that of the optical sensor in the prior art, and the manufacture cost of the metering device is reduced; meanwhile, the optical sensor assembly can confirm the rotating direction of the character wheel body and prevent a reading error caused by character wheel body reversal.
Description
Technical field
The present invention relates to realize the measuring apparatus of counting and definite method of character wheel position of rotation with character wheel, particularly relate to by optical sensor and determine the method for character wheel position of rotation and the measuring apparatus of use the method.
Background technology
Prior art realizes the measuring apparatus of counting with character wheel, such as water meter, ammeter, gas meter etc., comprises at least one print wheel component, and each print wheel component is for showing the one-bit digital of metering reading.Described print wheel component comprises on cylinder evenly that mark has the character wheel body of character code and for supporting the character wheel support of this character wheel body.Cost of labor and the low problem of meter reading efficiency in order to solve manual metering, brought, prior art is also provided for detecting pick-up unit and the data processing equipment of character wheel position of rotation in described print wheel component, by this pick-up unit and data processing equipment, can between character wheel position of rotation and the character code reading of reading by the reading window of measuring apparatus, set up relation one to one, thereby realize measuring apparatus Auto-counting reading, and realize remote meter reading by building network.Optical sensor is a kind of conventional described pick-up unit of prior art, when using described optical sensor, also need on described character wheel body, at least one optical transmission window be set, by this optical transmission window, can make optical sensor output two states, the status information of optical transmission window by optical sensor and optical transmission window be not by the status information of optical sensor.Quantity and the position of optical transmission window are rationally set, and the quantity of optical sensor and position, just can determine a group coding by gathering the output state of each optical sensor, and then according to this group coding, determine the position of rotation of described character wheel body.
Prior art realizes the measuring apparatus of character wheel automatic reading is also existed to following defect and weak point with light sensing principle:
1. prior art optical sensor comprises a light-emitting tube and a light receiving tube, therefore, this optical sensor can only be exported two states, be that state and the light receiving tube that light receiving tube receives from the light of light-emitting tube do not receive the state from the light of light-emitting tube, optical sensor can only corresponding binary-coded one, can not adapt to comparatively complicated code Design needs, and there is misalignment in order to prevent to character wheel automatic reading in prior art, and the false readings situation occurring because of character wheel reversion, be often forced to the comparatively complicated coding of design;
2. as mentioned above, an optical sensor can only be exported two states, and can not reflect character wheel sense of rotation, because character wheel reversion causes the problem of error in reading, it is the major issue that the current measuring apparatus that designs described character wheel automatic reading need to solve, prior art is mostly by the complicated code system of design, Gray code for example, whether the sense of rotation of differentiating character wheel is correct, the coding more complicated that this method forms, and in order to realize this code system, also need optical sensor and optical transmission window position and quantity separately to make special design, for example, a plurality of optical transmission windows and a plurality of optical sensor are set and strictly limit their angle relations between mutually, even need to arrange the optical transmission window of two groups or more different radii, thereby increased the design cost of described measuring apparatus, also reduced the physical strength that character wheel itself can bear,
3. the light-emitting tube of prior art optical sensor must keep illuminating state, even if character wheel body does not rotate, described light-emitting tube still needs to light, and causes energy loss; Although it is very little to light the electric energy of needs of light-emitting tube, but be arranged on the described measuring apparatus of field or rugged surroundings for some, need to use battery to this measuring apparatus power supply and in the lifetime of described measuring apparatus, reach the effect of as far as possible not changing battery, therefore, saving power consumption is also a major issue that needs solution to described measuring apparatus.
Summary of the invention
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art part and proposes a kind of for accurately locating character wheel to determine the method for demonstration character code and the measuring apparatus of the configuration light sensing gauge digit wheel that use the method is made, change configuration and the working method thereof of traditional photo sensor, the coded system of simple implementation character wheel automatic reading, improve automatic reading accuracy, and solve the false readings problem that character wheel reversion causes.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Design, manufacture a kind of measuring apparatus that configures light sensing gauge digit wheel, comprise at least one group of print wheel component, described print wheel component comprises that uniform labelling on character wheel support, cylinder has the cylindric character wheel body of N character code, at least one group of optical sensor components and Micro-processor MCV, wherein, and N >=2.Described character wheel body arranges the optical transmission window that at least one runs through this character wheel body vertically.Described optical sensor components is realized state variation by optical transmission window, and described Micro-processor MCV gathers the different conditions of each optical sensor components and encodes to determine the position of rotation of character wheel body.Especially, described in every group, optical sensor components comprises a light receiving tube, and penetrates the first light-emitting tube and the second light-emitting tube that light all faces this light receiving tube; Described light receiving tube and first, second light-emitting tube are separately positioned on the outside of character wheel body both ends of the surface.Described each first, second light-emitting tube is all in each self-gravitation or the normality lighted.Described Micro-processor MCV is controlled each first light-emitting tube and is changed successively their normalities separately, and detects each light receiving tube and whether receive the state of corresponding the first light-emitting tube separately and change, thereby forms the first code set; Subsequently, this Micro-processor MCV is controlled each second light-emitting tube and is changed successively their normalities separately, and detects each light receiving tube and whether receive the state of corresponding the second light-emitting tube separately and change, thereby forms the second code set.Described Micro-processor MCV is determined the position of rotation of character wheel body according to the first code set and the second code set, determine the reading that this character wheel body shows by reading window.
On described character wheel body, be provided with an optical transmission window, the window angle φ of this optical transmission window is
degree; Described window angle φ, refers to the maximum central angle forming between the orthogonal projection in the plane perpendicular to this character wheel body axis along character wheel body sense of rotation two boundary surfaces of described optical transmission window.Described print wheel component is provided with
group optical sensor components, function INT[x] represent the integral part get variable x; Described in every group in optical sensor group, in the plane perpendicular to described character wheel body axis, the orthogonal projection that the first light-emitting tube and the second light-emitting tube form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube, and the first interval central angle alpha between the orthogonal projection of described the first light-emitting tube and the orthogonal projection of described the second light-emitting tube meets
described
the second interval central angle β between individual light receiving tube is
degree; Described the second interval central angle β refers to the central angle forming between the orthogonal projection of adjacent two light receiving tubes in the plane perpendicular to this character wheel body axis.The center of circle of described central angle refers to the orthogonal projection of described character wheel body axis in the plane perpendicular to this character wheel body axis.
Described in every group in optical sensor group, in the plane perpendicular to described character wheel body axis, the orthogonal projection place radial line of light receiving tube of take is axis of symmetry, and the orthogonal projection of the orthogonal projection of the first light-emitting tube and the second light-emitting tube is symmetrical arranged.
For improving automatic reading accuracy, described the first interval central angle alpha also meets
degree.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Implement a kind of for accurately locating character wheel to determine the method that shows character code, measuring apparatus based on configuration light sensing gauge digit wheel, affiliated measuring apparatus comprises at least one group of print wheel component, described print wheel component comprises that uniform labelling on character wheel support, cylinder has cylindric character wheel body and the Micro-processor MCV of N character code, wherein, N >=2.Described method comprises the steps:
A. on described character wheel body, offer the optical transmission window that at least one runs through this character wheel body vertically;
B., at least one group of optical sensor components is set, and by described optical transmission window, described each optical sensor components is realized state variation, and described Micro-processor MCV gathers the different conditions of each optical sensor components and encodes to determine the position of rotation of character wheel body;
Especially,
C. a light receiving tube of optical sensor components configuration described in being every group, and penetrate the first light-emitting tube and the second light-emitting tube that light all faces this light receiving tube; Described light receiving tube and first, second light-emitting tube are separately positioned on the outside of character wheel body both ends of the surface; Described each first, second light-emitting tube is all in often going out separately or the normality of Chang Liang;
D. described each first light-emitting tube of Micro-processor MCV control changes their normalities separately successively, and detects the state change whether each light receiving tube receives each self-corresponding the first light-emitting tube, thereby forms the first code set;
E. described Micro-processor MCV is controlled each second light-emitting tube and is changed successively their normalities separately, and detects each light receiving tube and whether receive the state of corresponding the second light-emitting tube separately and change, thereby forms the second code set;
F. described Micro-processor MCV is determined the position of rotation of character wheel body according to the first code set and the second code set, determines the reading that this character wheel body shows by reading window.
Described step F comprises as follows step by step:
F1. described Micro-processor MCV compares the first code set and the second code set, only have when described the first code set is with the second code set when identical, according to the identical coding of two code set, determine again the position of rotation of described character wheel body, determine the reading that this character wheel body shows by reading window.
In steps A, on described character wheel body, offer an optical transmission window, and make the window angle φ of this optical transmission window be
degree; Described window angle φ, refers to the maximum central angle forming between the orthogonal projection in the plane perpendicular to this character wheel body axis along character wheel body sense of rotation two boundary surfaces of described optical transmission window.In step B, arrange
group optical sensor components, function INT[x] represent the integral part get variable x.In step C, the position of described light receiving tube, the first light-emitting tube and the second light-emitting tube is set, described in every group in optical sensor group, in the plane perpendicular to described character wheel body axis, the orthogonal projection that the first light-emitting tube and the second light-emitting tube form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube, and the first interval central angle alpha between the orthogonal projection of described the first light-emitting tube and the orthogonal projection of described the second light-emitting tube meets
meanwhile, described in arranging
the second interval central angle β between individual light receiving tube is
degree; Described the second interval central angle β refers to the central angle forming between the orthogonal projection of adjacent two light receiving tubes in the plane perpendicular to this character wheel body axis.The center of circle of described central angle refers to the orthogonal projection of described character wheel body axis in the plane perpendicular to this character wheel body axis.
In described step C, optical sensor group described in every group, in the plane perpendicular to described character wheel body axis, the orthogonal projection place radial line of light receiving tube of take is axis of symmetry, the orthogonal projection of the orthogonal projection of the first light-emitting tube and the second light-emitting tube is symmetrical arranged.For improving automatic reading accuracy, in described step C, described the first interval central angle alpha also meets
degree.
Compared with the existing technology, the present invention's " for locating the method for character wheel position of rotation and the measuring apparatus of use the method " technique effect is:
1. optical sensor components of the present invention comprises a light receiving tube and two light-emitting tubes, one group of this optical sensor components just can be exported four kinds of status signals, comprises that the state of only being received by light receiving tube from the light of the first light-emitting tube, the state of only being received by light receiving tube from the light of the second light-emitting tube, the state of being received by light receiving tube from the light of two light-emitting tubes and light receiving tube do not receive the state of light; Be applied in same code Design, the quantity of described optical sensor components will be less than the quantity of using prior art optical sensor, has reduced the manufacturing cost of measuring apparatus;
2. by light receiving tube in judgement optical sensor components, receive respectively the sequencing of the light of two light-emitting tubes, can determine the sense of rotation of character wheel body self, avoided the error in reading problem causing because of the reversion of character wheel body;
3. using whether receive the first light-emitting tube state as initial code, using whether receive the second light-emitting tube state as confirming coding, by initial code and the accurate location of confirming the state correspondence character code reading that coding is identical, can greatly simplify code Design, make only to arrange an optical transmission window and just can realize the accurate location to character wheel position of rotation, also solved the false readings problem that misplaces reading problem and reverse and cause because of character wheel simultaneously;
4. the present invention adopts polling mode to the state-detection of described optical sensor components, thereby make two light-emitting tubes in optical sensor components need to be in normal bright state, saved the power consumption of described optical sensor components, for the life-span extending in described measuring apparatus lowered in field environment or rugged surroundings provides condition.
Accompanying drawing explanation
Fig. 1 is the present invention's " for locating the method for character wheel position of rotation and the measuring apparatus of use the method " main schematic diagram of looking of optical sensor components 110 principle of work orthogonal projection;
Fig. 2 is that schematic diagram is looked on optical sensor components of the present invention 110 principle of work orthogonal projection left sides;
Fig. 3 is optical sensor components 110 state-detection hardware connection diagrams of the present invention;
Fig. 4 is the main schematic diagram of looking of the orthogonal projection of first embodiment of the invention;
Fig. 5 is that the character code of described the first embodiment shows and the coding table of comparisons;
Fig. 6 is the main schematic diagram of looking of the orthogonal projection of second embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, be described in further detail.
The present invention proposes a kind of measuring apparatus that configures light sensing gauge digit wheel, comprise at least one group of print wheel component 100, described print wheel component 100 comprises that uniform labelling on character wheel support, cylinder has the cylindric character wheel body 120 of N character code, at least one group of optical sensor components 110 and Micro-processor MCV 140, wherein, N >=2.Described character wheel body 120 arranges at least one optical transmission window that runs through vertically this character wheel body 120 121.Described optical sensor components 110 is realized state variation by optical transmission window 121, and described Micro-processor MCV 140 gathers the different conditions of each optical sensor components 110 and encodes to determine the position of rotation of character wheel body.The quantity of described print wheel component 100 determines by concrete application demand, and described measuring apparatus need to show the figure place of data, the one-bit digital in the corresponding shown data of each print wheel component 100.
As depicted in figs. 1 and 2, described in every group, optical sensor components 110 comprises a light receiving tube 111, and penetrates the first light-emitting tube 112 and the second light-emitting tube 113 that light all faces this light receiving tube 111.Dotted line in Fig. 2 represents the light that light-emitting tube sends.Described light receiving tube 111 and first, second light-emitting tube 112,113 are separately positioned on the outside of character wheel body 120 both ends of the surface.For convenient, install, described light receiving tube 111 and two light-emitting tubes 112,113 are all arranged on described character wheel support.Described character wheel support is used to described character wheel body 120 that bearing is provided, and fixedly mounts whole print wheel component 100.The optical transmission window 121 that coordinates character wheel body 120 and upper setting thereof, described optical sensor components 110 can be exported four kinds of states, and Fig. 1 has embodied this four kinds of states.In Fig. 1, on described character wheel body 120, be provided with three optical transmission windows 121 and four groups of optical sensor components 110, every group of optical sensor components 110 is in a kind of duty.Four kinds of output states of described optical sensor components 110 are respectively:
1. light receiving tube 111 is received the state from the light of two light-emitting tubes 112,113 simultaneously, as in Fig. 1 at dotted line O
1z
10and O
1z
11folded region Z
1in the output state of optical sensor components 110, the light that now two light-emitting tubes 112,113 send can pass through optical transmission window 121 directive light receiving tubes 111;
2. light receiving tube 111 is only received the state from the light of the first light-emitting tube 112, as in Fig. 1 at dotted line O
1z
20and O
1z
21folded region Z
2in the output state of optical sensor components 110, the light that now the first light-emitting tube 112 sends can pass through optical transmission window 121 directive light receiving tubes 111, but the light that the second light-emitting tube 113 sends is blocked by character wheel body 120;
3. light receiving tube 111 does not receive the state of light, as in Fig. 1 at dotted line O
1z
30and O
1z
31folded region Z
3in the output state of optical sensor components 110, the light that now two light-emitting tubes 112,113 send is all blocked by character wheel body 120;
4. light receiving tube 111 is only received the state from the light of the second light-emitting tube 113, as in Fig. 1 at dotted line O
1z
40and O
1z
41folded region Z
4in the output state of optical sensor components 110, the light that now the second light-emitting tube 113 sends can pass through optical transmission window 121 directive light receiving tubes 111, but the light that the first light-emitting tube 112 sends is blocked by character wheel body 120.
As shown in Figure 3, the present invention adopts the mode of poll to realize the detection to above-mentioned four kinds of states by Micro-processor MCV 140.Suppose to be provided with M optical sensor components 110 in print wheel component 100, each first light-emitting tube 112 is electrically connected to the port T of Micro-processor MCV 140 so
11, T
21..., T
m1, each the second light-emitting tube 113 is electrically connected to the port T of Micro-processor MCV 140
12, T
22..., T
m2, each light receiving tube 111 is electrically connected to the port R of Micro-processor MCV 140
1, R
2..., R
m.First need to make all a kind of normalities in extinguishing state or illuminating state separately of described each first, second light-emitting tube 112,113.From Energy Angle, consider, described two light-emitting tubes 112,113 should be set to the state that often goes out.Therefore, below take two light-emitting tubes 112,113 and be set to the state that often goes out as example description status testing process: described Micro-processor MCV 140 is controlled each first light-emitting tubes 112 and changed successively their normalities separately, be i.e. Micro-processor MCV 140 successively to port T
11, T
21..., T
m1send and light signal, each first light-emitting tube 112 is lighted successively, and Micro-processor MCV 140 detection port R
1, R
2..., R
mstate, detect each light receiving tube 111 and whether receive the state from extinguishing to lighting of corresponding the first light-emitting tube 112 separately and change, thereby form the first code set; Certainly epicycle has detected the normality that will recover each first light-emitting tube 112, and state often goes out; Subsequently, this Micro-processor MCV 140 is controlled each second light-emitting tubes 113 and is changed successively their normalities separately, i.e. Micro-processor MCV 140 successively to port T
12, T
22..., T
m2send and light signal, each second light-emitting tube 113 is lighted successively, and Micro-processor MCV 140 detects each light receiving tube 111 and whether receives the state change of corresponding the second light-emitting tube 113 from extinguishing to lighting separately, thereby form the second code set, same epicycle has detected the normality that will recover each second light-emitting tube 113, and state often goes out.Described Micro-processor MCV 140 is determined the position of rotation of character wheel body 120 according to the first code set and the second code set, determine the reading that this character wheel body 120 shows by reading window.Obviously, if the normality of two light-emitting tubes 112,113 is set, be normal bright state, the principle that can apply equally above-mentioned poll realizes the output state that detects optical sensor components 110.
Obviously, by judging the order of lighting of the first light-emitting tube 112 and the second light-emitting tube 113, just can know the sense of rotation of described character wheel body 120.
For take two light-emitting tubes 112,113 be set to normal bright state as time, the poll of described Micro-processor MCV 140 and testing process are contrary with above-mentioned example, this is apparent to those of ordinary skills, repeats no more herein.
The present invention realizes above-mentioned technology contents by the following method:
Implement a kind of for accurately locating character wheel to determine the method that shows character code, measuring apparatus based on above-mentioned configuration light sensing gauge digit wheel, described measuring apparatus comprises at least one group of print wheel component 100, described print wheel component 100 comprises that uniform labelling on character wheel support, cylinder has cylindric character wheel body 120 and the Micro-processor MCV 140 of N character code, wherein, N >=2.Described method comprises the steps:
A. at described character wheel body 120, offer at least one optical transmission window that runs through vertically this character wheel body 120 121;
B., at least one group of optical sensor components 110 is set, by described optical transmission window 121, described each optical sensor components is realized state variation, and described Micro-processor MCV 140 gathers the different conditions of each optical sensor components 110 and encodes to determine the position of rotation of character wheel body;
C. a light receiving tube 111 of optical sensor components 110 configurations described in being every group, and penetrate the first light-emitting tube 112 and the second light-emitting tube 113 that light all faces this light receiving tube 111; Described light receiving tube 111 and first, second light-emitting tube 112,113 are separately positioned on the outside of character wheel body 120 both ends of the surface; Described each first, second light-emitting tube 112,113 is all in often going out separately or the normality of Chang Liang;
D. described Micro-processor MCV 140 each first light-emitting tubes 112 of control change their normalities separately successively, and detect the state change whether each light receiving tube 111 receives each self-corresponding the first light-emitting tube 112, thereby form the first code set;
E. described Micro-processor MCV 140 is controlled each second light-emitting tubes 113 and is changed successively their normalities separately, and detects each light receiving tube 111 and whether receive the state of corresponding the second light-emitting tube 113 separately and change, thereby forms the second code set;
F. described Micro-processor MCV 140 is determined the position of rotation of character wheel body 120 according to the first code set and the second code set, determines the reading that this character wheel body 120 shows by reading window.
Optical sensor components 110 of the present invention can be exported four kinds of states, is applied in same code Design, and the quantity of described optical sensor components 110 will be less than the quantity of using prior art optical sensor, has reduced the manufacturing cost of measuring apparatus; By light receiving tube 111 in judgement optical sensor components, receive respectively the sequencing of the light of two light-emitting tubes 112,113, can determine the sense of rotation of character wheel body 120 self, avoided the error in reading problem causing because of 120 reversions of character wheel body.
About optical transmission window 121 quantity and the position of offering on described character wheel body 120, and can there be kinds of schemes quantity and position that optical sensor components 110 is set, from commercial Application angle, consider, the present invention proposes some concrete technical schemes of simplifying the most, also be the scheme that cost is minimum, but should be with following concrete scheme as unique restriction technical scheme of the present invention.
From simplifying the processing procedure of Micro-processor MCV 140, consider, above-mentioned steps F of the present invention can be more specifically F1 step by step as follows:
F1. described Micro-processor MCV 140 compares the first code set and the second code set, only have when described the first code set is with the second code set when identical, according to the identical coding of two code set, determine again the position of rotation of described character wheel body 120, determine the reading that this character wheel body 120 shows by reading window.
From simplifying print wheel component 100 configuration aspects, can realize and character wheel body 120 be presented to the automatic reading of character code at display window with minimum optical transmission window 121 and minimum optical sensor components 110.
Because the distribution of N character code on character wheel body 120 cylinders is uniformly, be equivalent in the process rotating a circle of character wheel body 120, each character code has occupied
the anglec of rotation of degree, therefore, as shown in Figure 4 and Figure 6, character wheel body 120 can be divided into N fan section in the circular orthogonal projection perpendicular in axis plane, so as minimalist program, on described character wheel body 120, be only provided with an optical transmission window 121, this optical transmission window 121 should cover the minimum fan section that is no less than half, and the fan section that optical transmission window 121 covers should reach
individual, function INT[x] represent the integral part of getting variable x, after rounding up
thus, the window angle φ of described optical transmission window 121 is
degree; Described window angle φ, refer to described optical transmission window 121 along the maximum central angle forming between 120 orthogonal projection of sense of rotation two boundary surfaces in the plane perpendicular to these character wheel body 120 axis of character wheel body.
Adapt to the plan of establishment of above-mentioned optical transmission window 121, described print wheel component 100 is provided with
group optical sensor components 110, is equivalent to each optical sensor components 110 fan section of corresponding detection, and can occurs the situation that all optical sensor components 110 are all covered by optical transmission window 121.Therefore, as shown in Figure 4 and Figure 6, described in every group in optical sensor group 110, in the plane perpendicular to described character wheel body 120 axis, the orthogonal projection that the first light-emitting tube 112 and the second light-emitting tube 113 form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube 111, and the first interval central angle alpha between the orthogonal projection of described the first light-emitting tube 112 and the orthogonal projection of described the second light-emitting tube 113 meets
described
the second interval central angle β between individual light receiving tube 111 is
degree.Described the second interval central angle β refers to the central angle forming between the orthogonal projection of adjacent two light receiving tubes 111 in the plane perpendicular to these character wheel body 120 axis.The center of circle of described central angle refers to the orthogonal projection of described character wheel body 120 axis in the plane perpendicular to these character wheel body 120 axis.
In order to obtain good detection effect, described in every group in optical sensor group 110, in the plane perpendicular to described character wheel body 120 axis, the orthogonal projection place radial line of light receiving tube 111 of take is axis of symmetry, and the orthogonal projection of the orthogonal projection of the first light-emitting tube 112 and the second light-emitting tube 113 is symmetrical arranged.
If reach best detection effect, should should be tried one's best in the region between two light-emitting tubes 112,113 near the region that reaches a fan section, described the first interval central angle alpha also meets
degree.
Technique scheme can also realize according to following method:
In steps A, on described character wheel body 120, offer an optical transmission window 121, and make the window angle φ of this optical transmission window 121 be
degree.Described window angle φ, refer to described optical transmission window 121 along the maximum central angle forming between 120 orthogonal projection of sense of rotation two boundary surfaces in the plane perpendicular to these character wheel body 120 axis of character wheel body.
In step B, arrange
group optical sensor components 110, function INT[x] represent the integral part get variable x.
In step C, the position of described light receiving tube 111, the first light-emitting tube 112 and the second light-emitting tube 113 is set, described in every group in optical sensor group 110, in the plane perpendicular to described character wheel body 120 axis, the orthogonal projection that the first light-emitting tube 112 and the second light-emitting tube 113 form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube 111, and the first interval central angle alpha between the orthogonal projection of described the first light-emitting tube 112 and the orthogonal projection of described the second light-emitting tube 113 meets
degree.Meanwhile, described in arranging
the second interval central angle β between individual light receiving tube 111 is
degree.Described the second interval central angle β refers to the central angle forming between the orthogonal projection of adjacent two light receiving tubes 111 in the plane perpendicular to these character wheel body 120 axis.The center of circle of described central angle refers to the orthogonal projection of described character wheel body 120 axis in the plane perpendicular to these character wheel body 120 axis.
In order to obtain good detection effect, in described step C, optical sensor group 110 described in every group, in the plane perpendicular to described character wheel body 120 axis, the orthogonal projection place radial line of light receiving tube 111 of take is axis of symmetry, and the orthogonal projection of the orthogonal projection of the first light-emitting tube 112 and the second light-emitting tube 113 is symmetrical arranged.
If reach best detection effect, in described step C, described the first interval central angle alpha also meets
degree.
The representative that is even number as character code number, first embodiment of the invention, as shown in Figure 4, character code is counted N=10, and character wheel body 120 is rotated counterclockwise along arrow RD direction indication, measuring apparatus reading window line segment S
1s
2signal, reading visual angle is as arrow W indication, and each shared central angle in the fan section separating with dotted line is 36 °, therefore, be provided with 5 groups of optical sensor components, wherein, φ=180 °, 36 ° of 18 ° of < α=30 ° <, β=36 °.The center of circle of described central angle is O
2.Optical sensor group 110 described in every group, in the plane perpendicular to described character wheel body 120 axis, the orthogonal projection place radial line of light receiving tube 111 of take is axis of symmetry, the orthogonal projection of the orthogonal projection of the first light-emitting tube 112 and the second light-emitting tube 113 is symmetrical arranged.Character wheel body 120 rotates a circle, from measuring apparatus reading window S
1s
2the character code of reading, the first code set, the second code set and character code are at the show state corresponding relation of window as shown in Figure 5.As shown in Figure 5, only have the first code set when identical, could determine the character code showing with the second code set, the corresponding self-reading character code of coding that two code set are identical, and when two code set are different, by relatively encoding and can determine the sense of rotation of character wheel body 120.And adopt prior art optical sensor, and with prior art optical sensor, replace optical sensor group 110 of the present invention, prior art cannot reach accurate corresponding reading and determine the technique effect that character wheel body turns to.
The representative that is odd number as character code number, second embodiment of the invention, as shown in Figure 6, character code is counted N=7, and character wheel body 120 is rotated counterclockwise along arrow RD direction indication, measuring apparatus reading window line segment S
3s
4signal reading visual angle is as arrow W indication, each shared central angle in the fan section separating with dotted line is approximately 51.42 °, therefore, be provided with 4 groups of optical sensor components, wherein, 205.68 ° of φ ≈ 51.42 ° * 4 ≈, 51.42 ° of 25.71 ° of < α=45.42 ° <, 51.42 ° of β ≈.The center of circle of described central angle is O
3.Optical sensor group 110 described in every group, in the plane perpendicular to described character wheel body 120 axis, the orthogonal projection place radial line of light receiving tube 111 of take is axis of symmetry, the orthogonal projection of the orthogonal projection of the first light-emitting tube 112 and the second light-emitting tube 113 is symmetrical arranged.
Claims (9)
1. a measuring apparatus that configures light sensing gauge digit wheel, comprise at least one group of print wheel component (100), described print wheel component (100) comprises that uniform labelling on character wheel support, cylinder has cylindric character wheel body (120), at least one group of optical sensor components (110) and the Micro-processor MCV (140) of N character code; Wherein, N >=2; Described character wheel body (120) arranges at least one optical transmission window (121) that runs through vertically this character wheel body (120); Described optical sensor components (110) is realized state variation by optical transmission window (121), and described Micro-processor MCV (140) gathers the different conditions of each optical sensor components (110) and encodes to determine the position of rotation of character wheel body; It is characterized in that:
Optical sensor components described in every group (110) comprises a light receiving tube (111), and penetrates the first light-emitting tube (112) and the second light-emitting tube (113) that light all faces this light receiving tube (111); Described light receiving tube (111) and first, second light-emitting tube (112,113) are separately positioned on the outside of character wheel body (120) both ends of the surface;
Described each first, second light-emitting tube (112,113) is all in each self-gravitation or the normality lighted; Described Micro-processor MCV (140) is controlled each first light-emitting tube (112) and is changed successively their normalities separately, and detect the state whether each light receiving tube (111) receive corresponding the first light-emitting tube (112) separately and change, thereby form the first code set; Subsequently, this Micro-processor MCV (140) is controlled each second light-emitting tube (113) and is changed successively their normalities separately, and detect the state whether each light receiving tube (111) receive corresponding the second light-emitting tube (113) separately and change, thereby form the second code set; Described Micro-processor MCV (140) is determined the position of rotation of character wheel body (120) according to the first code set and the second code set, determine the reading that this character wheel body (120) shows by reading window.
2. the measuring apparatus of configuration light sensing gauge digit wheel according to claim 1, is characterized in that:
On described character wheel body (120), be provided with an optical transmission window (121), the window angle φ of this optical transmission window (121) is
degree; Described window angle φ, refers to the maximum central angle forming between the orthogonal projection in the plane perpendicular to this character wheel body (120) axis along character wheel body (120) sense of rotation two boundary surfaces of described optical transmission window (121);
Described print wheel component (100) is provided with
group optical sensor components (110), function INT[x] represent the integral part get variable x; In optical sensor components described in every group (110), in the plane perpendicular to described character wheel body (120) axis, the orthogonal projection that the first light-emitting tube (112) and the second light-emitting tube (113) form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube (111), and the first interval central angle alpha between the orthogonal projection of described the first light-emitting tube (112) and the orthogonal projection of described the second light-emitting tube (113) meets
degree; Described
the second interval central angle β between individual light receiving tube (111) is
degree; Described the second interval central angle β refers to the central angle forming between the orthogonal projection of adjacent two light receiving tubes (111) in the plane perpendicular to this character wheel body (120) axis;
The center of circle of described central angle refers to the orthogonal projection of described character wheel body (120) axis in the plane perpendicular to this character wheel body (120) axis.
3. the measuring apparatus of configuration light sensing gauge digit wheel according to claim 2, is characterized in that:
In optical sensor components described in every group (110), in the plane perpendicular to described character wheel body (120) axis, the orthogonal projection place radial line of light receiving tube (111) of take is axis of symmetry, and the orthogonal projection of the orthogonal projection of the first light-emitting tube (112) and the second light-emitting tube (113) is symmetrical arranged.
4. according to the measuring apparatus of the configuration light sensing gauge digit wheel described in claim 2 or 3, it is characterized in that:
Described the first interval central angle alpha also meets
degree.
One kind for accurate location character wheel to determine the method that shows character code, measuring apparatus based on configuration light sensing gauge digit wheel, described measuring apparatus comprises at least one group of print wheel component (100), and described print wheel component (100) comprises that uniform labelling on character wheel support, cylinder has cylindric character wheel body (120) and the Micro-processor MCV (140) of N character code; Wherein, N >=2; Described method comprises the steps:
A. on described character wheel body (120), offer the optical transmission window (121) that at least one runs through this character wheel body (120) vertically;
B., at least one group of optical sensor components (110) is set, by described optical transmission window (121), described each optical sensor components is realized state variation, and described Micro-processor MCV (140) gathers the different conditions of each optical sensor components (110) and encodes to determine the position of rotation of character wheel body;
It is characterized in that described method also comprises the steps:
C. described in being every group, optical sensor components (110) configures a light receiving tube (111), and penetrates the first light-emitting tube (112) and the second light-emitting tube (113) that light all faces this light receiving tube (111); Described light receiving tube (111) and first, second light-emitting tube (112,113) are separately positioned on the outside of character wheel body (120) both ends of the surface; Described each first, second light-emitting tube (112,113) is all in each self-gravitation or the normality lighted;
D. each first light-emitting tube (112) of described Micro-processor MCV (140) control changes their normalities separately successively, and detect the state change whether each light receiving tube (111) receives each self-corresponding the first light-emitting tube (112), thereby form the first code set;
E. each second light-emitting tube (113) of described Micro-processor MCV (140) control changes their normalities separately successively, and detect the state whether each light receiving tube (111) receive corresponding the second light-emitting tube (113) separately and change, thereby form the second code set;
F. described Micro-processor MCV (140) is determined the position of rotation of character wheel body (120) according to the first code set and the second code set, determines the reading that this character wheel body (120) shows by reading window.
6. according to claim 5 for accurately locating character wheel to determine the method that shows character code, it is characterized in that:
Described step F comprises as follows step by step:
F1. described Micro-processor MCV (140) compares the first code set and the second code set, only have when described the first code set is with the second code set when identical, according to the identical coding of two code set, determine again the position of rotation of described character wheel body (120), determine the reading that this character wheel body (120) shows by reading window.
7. according to claim 5 for accurately locating character wheel to determine the method that shows character code, it is characterized in that:
In steps A, on described character wheel body (120), offer an optical transmission window (121), and make the window angle φ of this optical transmission window (121) be
degree; Described window angle φ, refers to the maximum central angle forming between the orthogonal projection in the plane perpendicular to this character wheel body (120) axis along character wheel body (120) sense of rotation two boundary surfaces of described optical transmission window (121);
In step B, arrange
group optical sensor components (110), function INT[x] represent the integral part get variable x;
In step C, the position of described light receiving tube (111), the first light-emitting tube (112) and the second light-emitting tube (113) is set, in optical sensor components described in every group (110), in the plane perpendicular to described character wheel body (120) axis, the orthogonal projection that the first light-emitting tube (112) and the second light-emitting tube (113) form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube (111), and the first interval central angle alpha between the orthogonal projection of described the first light-emitting tube (112) and the orthogonal projection of described the second light-emitting tube (113) meets
degree; Meanwhile, described in arranging
the second interval central angle β between individual light receiving tube (111) is
degree; Described the second interval central angle β refers to the central angle forming between the orthogonal projection of adjacent two light receiving tubes (111) in the plane perpendicular to this character wheel body (120) axis;
The center of circle of described central angle refers to the orthogonal projection of described character wheel body (120) axis in the plane perpendicular to this character wheel body (120) axis.
8. according to claim 7 for accurately locating character wheel to determine the method that shows character code, it is characterized in that:
In described step C, optical sensor components described in every group (110), in the plane perpendicular to described character wheel body (120) axis, the orthogonal projection place radial line of light receiving tube (111) of take is axis of symmetry, and the orthogonal projection of the orthogonal projection of the first light-emitting tube (112) and the second light-emitting tube (113) is symmetrical arranged.
9. according to to determine the method that shows character code, it is characterized in that for accurate location character wheel described in claim 7 or 8:
In described step C, described the first interval central angle alpha also meets
degree.
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| CN201010206683.8A CN102288209B (en) | 2010-06-19 | 2010-06-19 | Method for positioning rotating position of character wheel and metering device thereby |
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| CN201010206683.8A CN102288209B (en) | 2010-06-19 | 2010-06-19 | Method for positioning rotating position of character wheel and metering device thereby |
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