US1653839A - Sheet-feeding mechanism for printing machines and the like - Google Patents

Description

Dec. 27, 1927.

A. BUTTNER SHEET FEEDING MECHANISM FOR PRINTING MACHINES AND THE LIKE Filed July26, 1926 2 Sheets-Sheet l JJlVtZZZOJ 111' r 12271281" 5'51 2520 may- Dec. 27, 1927.

A. BUTTNER SHEET FEEDING MECHANISM FOR PRINTING MACHINES AND THE LIKE 2 Sheets-Sheet 2 Filed July26, 1926 1214912 for r JfWf flit v2 9y,

Patented Dec.. 27, 1927.

* assen UNITED" STATES PATENT OFFICE. g,

ABTUR iBfiT'INEB, F HEIDELI BERG, GERMANY, ASSIGNOR TO 'SCHNELLPRESSEN- FABRIK AKTIENGESELLSCHAFT HEIDELBERG, 0F HEIDELBERG, GERMANY, A COR- PORATION OF GERMANY SHEET-FEEDING MECHANISM FOR PRINTING MACHINES AND THE LIKE.

Application filed July 26, 1926, Serial No. 125,027, and in Germany July 25, 1925.

My invention relates to a driving gear for slowing down the movement of the'sheets'in automatic sheet feeding mechanism for printing machines or the like, without the aid of cam gear.

For the purpose of moving the sheets brought from the pile to the feeding means of the laying-0n table to the gauge pins with decreased speed, various devices are already known; most of them make use of elliptical wheel gearing which is little suited for high speed printing.

In other known devices the slowing down of the movement of the sheets has also been effected without cams, merely by wheel.

gearing, whichhowever has hitherto only enabled a reduction of speed of about 70% to be obtained. By the present invention a driving gear without cams is provided by which in a very simple manner a slowing down of the speed to nil may be attained.

The invention consists essentially in that a pinion rotated at uniform speed about a. second stationary pinion isconnected by means of a rod or the like with the driving wheel of the feeding means which'bring the sheets to the. laying-on table. By the simple manner of workingof the driving gear itself according to the invention continually quiet running at the highest speed of the machine is assured,as only very small masses are rotating and therefore no large stresses are occasioned within the driving gear. 4

The invention is illustrated diagrammatically and by way of example on the accompanying drawings on which Figure 1 is a side-view of those parts of a printing. machine in which the invention is. embodied; Figure 2 is a section in the plane II of Fig. 1, Figure 3 a section in the plane II1I of Fig. 2; and Figure 4 is a diagram showing the speed variation of the sheet feeding device.

The electromotor a is driving by means of a belt I) the pulley 0 which is keyed to the shaft (Z. There is afiixed to this shaft also a pinion e meshing with a toothed-wheel g secured to the main-shaft f of the machine.

At one end of the driving shaft 7' is rigidly secured ,a crank f At the free end of this crank f is fixed a bearing pin it, upon which a pinion i is free to rotate. The pinion '11 engages with a pinion lcof the same size, which is rigidly mounted on a nonrotatable pin Zheld in the machine frame m,

and co-axial with the shaft f. On thepin described below, the feeding means for the sheets. The bush'z' to which the pinion i is keyed, has a projecting arm provided with a radial slot Q1. The driving wheel a is connected by a rod 0 with the rotating pinion i, said rod engaging on the one hand with the pin p secured to the driving wheel at and on the other hand with the'pin g which engages the slot 9. of the rotating pinion i. The pin 9 can be adjusted in the slot 9 so that its centre of attachment can be disposed nearer the circumference or nearer the axis of the pinion f'z' as may be necessary.

The operation of the driving gear is as follows L The shaft f which is driven by the electromotor a in such manner that it performs a rotation at each printing operation of the machine, drives the pinion i by means of the crank f round the stationary pinion 70, so that i turns around this. Since the two piniryfi s I: and i have the same diameter, the $0 pini n 2' turns once about its axis at each rotation around pinion k, and the centre point of the pin 9 moves through the so-- called pericardoid curve indicated bypoints l to 12 on Fig. 4. As is evident from this diagram, the speed increases from points 1 to 6 and then decreases again from points 6 to 12. The acceleration and retardation of the. speed is transmitted to the driving wheel at. The centre point of the pin p 110 traces a circular path, and the points I to XII show how the speed of rotation of the driving wheel 11. is acceleratedand retarded. On passing through the point 12 the speed" of rotation of wheel n is practically nil.

According to the-adjustment of the pin 1 on. pinion i the magnitude of the retardation is determined for a given time.

The accelerated and retarded rotary motion of the toothed-wheel n is transmitted to a toothed-wheel r meshing with the wheel 'n. The wheel 1' is affixed to ashaft r supported in the frame of the machine and carrying, besides, a bevel-wheel s keyed to it. This wheel is in gear with another bevel-wheel s secured to a shaft)? also supported in the frame of the, machine. This shaft drives, by means of a pair of bevel-wheels u, the

driving roller '0 for the endless conveying band 0 The sheet to be printed which has been withdrawn in known manner from the pile w is placed upon said conveying band and carried byit with decreasing speed to the abutments a: from where it is transmitted in known manner to andupon the printing cylinder 3 Those parts and devices that serve to drive the main shaft 7, as well as the means for transmitting the accelerated or retarded 1otary motion of the toothed-wheel n to the sheet conveying means, and, finally, these means themselves, do not form parts of the present invention; they havebeen shown and described solely for the sfire of a betterunderstanding of the geari g forming the subject-matter of the invention.

I claim:

1. A driving gear for retarding the movement of the sheets in automatic sheet feeding mechanism for printing machines and the like,icomprising, in combination, a stationary pinion, a movable pinion rotated with uniform speed about said stationary one, feeding means for the sheets to be printed, a

wheel formin part of this means and being adapted to bring the sheet into printing 0- sition, and means connecting said mova le pinion with said wheel, the connection of these means with the movable pinion being such that its point of engagement between the )eriphery and the axis of the said pinion can adjusted, substantially as set forth.

2. A driving gear for retarding the movement of the sheets in automatic sheet feeding mechanism for printing machines and the like, comprising, in combination, a stationary pinion, a movable pinion rotated with uniform speed about said stationary one, feeding means for the sheets to be print ed, a wheel .forming part of this means and being adapted to bring the sheet into printing position, and a rod connecting said movable pinion with said whecL'the connection of said rod with the movable pinion being such that its point of engagement between the periphery and the axis of the said pinion can be adjusted, substantially as set forth.

In testimony whereof I have aflixed my signature.

ARTUR BUTTNER.

Images