US1614801A - Type cylinder for rotary presses - Google Patents

Description

Jan. 18,1927. 1,614,801

A. F. OSTERLIND TYPE CYLINDER FOR ROTARY PRESSES Filed lay a 1 11911527? QyZerZzw w, MW 02%? I dummy Patented Jan. 18, 1921.

UNITED ST TES ml FOB ROTARY P338838.

Application filed m e. was. sci-m m. 23,391.

In my co-pending application for atent upon a rotary press, Serial No. 735,23 filed September 2nd, 1924, I have described a machine adapted for general or job printing, in which the type cylinders have peripheries equal or substantially equal to one of the principal dimensions of the sheet to be printed. To ada t such machines for printmg sheets of di ering sizes, a number of type cylinders of corresponding sizes are provided and arranged to be exchanged one for another. Type cylinders of small diameter are necessarily employed in such machines, and this precludes the use of electrotypes of the usual thickness of 11/72ds of an inch. Abrupt bending of such thick plates distorts the surface of the type to an extent which renders printing therewith impractical. However, I have discovered that the thickness of the'plates may safely be reduced to about .06 of an inch and that such thin plates are adapted to be mounted on cylinders of small diameter, viz, from 2 to 5 inches in diameter.

Obviously, the commonly employed means for securing plates to cylinders or other bases cannot be used upon such thin plates, and the present invention relates to improved means for securing printers plates of the type described in said application, filed September 2nd, 1924, to small printing cylinders.

It is the object of this invention to provide novel and efiicient means for'securing printers plates, of the thin type used in such machines, upon supporting cylinders. This invention also includes certain novel features of construction, which will be more fully pointed out in the following specification and claims.

Referring to the accompanying drawings, which illustrate the best form'of my device at present known to me, Figure 1 is a side elevation of my improved type cylinder with the driving pinion in central, vertical section; Fig. 2 is a section taken on the line 22 of Fig. 1; Fig. 3 is 'a fragmentary section taken on the line,33 of Fig. 1; Fig. 4 is a fragmentary end view, showing the means for securing the drive pinion on the shaft of the cylinder; Fig; 5 1s a detail of the dog for engaging the shaft and Fig. 6 is a detail, perspective view of an end of the bar for engaging the printers plate or electrotype on the cylinder.

In the drawin I have used the numeral 7 to indicate a t in plate of the type adapted to be mounted on a cylinder 8 of small diameter. A shaft 15 rigidly supports the cylinder 8, while a gear 16 is adjustable on said shaft, being arranged to be driven at a. fixed speed relative to the paper cuttin mechamsm of a rotary press. This fixed speed ratio is not changed when cylinders 8 of different sizes are laced in the machine, but the impression cylinder (not shown) is merely moved into peripherial contact with the type cylinders. The cylinder 8 is formed with a longitudinal oove 9 in its periphery, the sides of whic converge inward. In the bottom of this groove 9 is a series of tapped holes 10 for a series of screws 11, adapted to secure a longitudinal bar 12 in said groove. The screws 11 have countersunk heads formed with depressions adapted to be engaged by a wrench for turningsaid screws. Extending transversely through the 'bar 12, at suitable spaced intervals, is a series of pins 13, which project at the sides of said bar to engage margins 14 on the plate 7.

To permit chan 'ng of the angular position of the cylin er 8, relative to a drive pinion or gear 16 upon an axial shaft 15, I form a hub on said gear, which has an inwardl extending groove 17, ad'acent to the sha 15, for a dog 18. This og has a. roughened surface 19, adapted to grip the shaft 15, and a suitable set screw 20 threaded in the hub of the gear 16 is arranged to be turned to press the dog 18 against the shaft 15. This set screw 20 is formed with an axial hole, which is squared to receive a. wrench or key for turning said screw.

In operation, the plate 7 is repared in the usual manner by the electro yte process or otherwise, thus producing under the present practice, a plate of about eleven seventyseconds of an inch thick. This plate is then reduced to about six hundredths of an inch thick by removing metal from the back thereof. The margins 14, of about a quarter of an inch in width, consisting of the copper shell of the plate, are left at the adjoining edges thereof. The thin plate thus produced may now be bent to conform to the cylinder 8 by the use of straps placed about the plate and cylinder. Now with the clamping bar 12- removed, the edges or margins 14 of the plate 7 are bent into the groove 9, as clearly shown in Figure 3, when said bar 12 is relaced and. ressed into thev groove 9. Finall to secure y fasten said bar in place and to raw the plate 7 snugly about the cylinder- 8, the screws 11 are inserted and turned to cause the ins 11 to grip the margins 14 and draw t em downward into the groove 9. ..The shaft 15 is referably formed integral with the cylin ersbf the smaller sizes, and said shaft is arranged to be placed in bearings of the .type described in m coending application, above referre to. Finally, to adjust the cylinder 8 and shaft 15, relative to the drive gear 16 and other parts of the press, said cylinder is rotated to bring the bar 12 along the line where the printed sheet is to be severed and then the set screw 20 is tightened to engage the shaft 15 with the dog 18.

Having described my invention what I claim as new and desire to protect by Letters Patent is:

1. The combination with 'a type cylinder formed with a longitudinal groove in the eriphery thereof, a type plate adapted to a plied to the periphery of said cylinder and having a margin adapted to be bent into said groove, a bar adapted to be placed longitudinally in said groove, means on a side edge of said bar adated to engage the margin of said plate an means for securing said bar in engagement with said margin, whereby said plate may be drawn tight about said cylinder and secured against rotation thereon.

. 2. The combination witha type cylinder 'formed' with a longitudinal groove in the riphery thereof, the sides of said groove ing arranged to converge inward, a type plate adapted to be applied to the periph:

ery of said cylinder and having margins adapted to be bent aga nst verging sides of said groove, said mar being separated one from the other, a at formed tofit in said ve, teeth projecting laterally from. said bar to engage the margins of said plate and means for securgpposite e coning said bar in engagement with said marins. I

a 3. Thecombination with a t e cylinder having its periphery substantial y equal to one of the principal dimensions of a shee to be printed, said cylinder being forme with a longitudinal groovein the periphery thereof, a thin type plate adapted to encircle said cylinder and havin g opposite margins adapted to be bent into said groove,

a bar extending longitudinall in I said groove, teeth on said bar adaipte to enga said margins and means for securingsaid bar in engagement with said margins.

4. The combination with a type cylinder formed with a, longitudinal groove in the periphery thereof, and a driving .gear arranged in axial alignmentwith said cylinder for driving the same, means for changing the angular position of said cylinder relative to said gear, a, type plate adapted to encircle said cylinder and havin margins adapted to be bent into'opposite si es of said groove, a bar adapted to be placed longitudinally in said groove, means on said bar adapted to engage the inwardly bent margins of said plate and means for securing said bar in engagement with saidmargins and cylinder.

In testimony whereof, I have hereunto signed my name to this specification,

AUGUST F. OSTERLTND.

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