US1854775A

US1854775A - Sheet depositing device

Info

Publication number: US1854775A
Application number: US494677A
Authority: US
Inventors: Wichmann Reginald
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-11-12
Filing date: 1930-11-10
Publication date: 1932-04-19
Anticipated expiration: 1949-04-19

Description

April 19, 1932.

R. WICHMANN SHEET DEPOSITING DEVICE Filed NOV. 10, 1950 /n venfor': W

Patented Apr. 19, 1932 PATENT OFFICE REGINALD WIGHMANN, OF-CHISLEHURST, ENGLAND SHEET DEPOSITING DEVICE Application filed November 10, 1930, Serial No. 494.67? and in Germany November 12, 1929.

Sheet depositing devices with chain grippers are already known, in which the sheets are gripped at the rear end of the chain gripper path by rocking lever grippers, by

L} which they are deposited on the pile at a reduced speed. It is also known, that the chain grippers, which take over the sheet and slowly deposit same, are oscillatably mounted in the rocking levers and carry out a positive downward movement besides the oscillating movement. These known devices are actuated by cams and possess the inconvenience,

that the sheet can only be deposited with a certain retardation as far as a cam will allow. A further objection is, that in the known devices the gripper system was not moved over the sheet last deposited with the result, that very often in the case of thin paper the upper sheet is again pulled back.

The novelty consists in that, instead of a stationary curved guide for controlling the rocking grippers, a groove guide controlled by a cam is provided. The result of th 1s a'rrangement is, that the downward guiding, as also the conducting of the rocking gripper over the sheet last deposited can be adapted or adjusted to the thickness of the paper to be printed. I

In order to obtain the greatest retardatlon of the sheet, the rocking lever is driven by a crank gearing. By this improvement it is possible, in utilizing the retardation occurring near the dead centre for the last stroke of the sheet depositor, to feed the sheet, in conjunction with the improvement described in the previous paragraph, quietly and re liably to the pile of paper, even at a high speed.

An embodiment of the invention is illustrated diagrammatically by way of example in the accompanying drawings in which:

Fig. 1 shows the parts in the sheet delivering position.

Fig. 2 shows the parts in the sheet depositing position.

Fig. 3 is a top plan view of the rocking lever with the gripper system.

Fig. 4 is a side elevation of Fig. 3.

Fig. 5 shows the position of the parts during the return movement of the gripper system after depositing a sheet.

' 1 designates the known depositing chain Withthe gripper system 2 which brings the sheet 3 from the machine. The sheet has to be slowed down on the sheet stop 4; of the deposit pile 5, and deposited at right angles to the edge 4. 6 represents the known rocking lever. The gripper system 7 taking over thesheet ismounted on a two armed lever 8, which is oscillatably mounted in the levers 6. The gripper system 7 performs besides the oscillating movement (arrow a) a downward movement 7), before the sheet'arrivesin the horizontal plane relative to the sheet stop 4 Thus the sheetS in Fig. 1 is conducted along the path 0, which representsthe resultant of the movements a and b, downwardly at an incline and passes horizontally through the last portion (lot the travelup tothe'sheet To stop 4. A continuous retardation of the sheet occurs duringthe said travels 0 and d.

A pin 10 is ec'centrically mounted on a spur wheel 9 driven in known manner. A rod 11 is'mounted loosely oscillatabl'e on the pin 10- and has on its other'end' a pin 12', on which an elbow lever with the

arms

13 and 6 is arranged. This elbow'lever is pivotally mounted onthe pin 14.- The lower end of the lever arm 6" is fixed on a pin-15. The tWo-armed lever 8 is V loosely pivotably mounted on the pin 15, the gripper system 7 being fixed to one arm of this lever, whereas a 1301191116lS mOUHtBCl'OII the other arni of the lever 8. 'This-r'oller I6 is guided by a groove 17 in guide bar 18 which ispivotally mounted on a pin 19. On the upper side of the guide bar 18 a rigid pin 20 is fixed, onwhich a rod 21 is arranged. The rod 21 has at its other end a pin 22, on which the arm 23 05 a two armed lever 23,525 is hinged, said lever being pivot ally mounted on a pivot pin 24. The free end of the lever arm 25 carries a roller 26 bearing against a cam disc 27 This cam disc is keyed on the driving shaft 28, on which the spur Wheel 9 is keyed.

The operation is as follows:

If the shaft 28 revolves, the elements move from the position shown diagrammatically in Fig. 1 into the position shown in Fig. 2 m

during one half revolution of the shaft 28. The selection of a crank drive 10, l1, 13 for the rocking lever 6 presents the advantage, that near the lower dead centre 30 a great retardation of the movement of the gripper system 7 occurs during its travel along the portion (Z of the path of the sheet depositing. The rocking lever 6 merely performs a movement along the are 31. In order to 10 obtain the travel 0 and d of the gripper system 7, the lever 8 hingedly connected to the rocking lever 6 is controlled by the cam disc 27 and the elements coupled to the bolt thereby. Owing to the cooperation of the crank gearing with the adjustable control of the groove guide, the gripper system performs a movement, which can be adapted to the trajectory of the sheet for the different kinds of paper. The cam e on the cam disc 27 lifts the groove guide 17 by means of the connecting elements 20 to 26 at the instant, i when the sheet reaches the stop 4:. By this i lifting of the groove guide 17, the grippers 7 are also raised and freely moved back over the sheet last deposited (Fig. 5) so that, when the machine is running at high speed, a beating back of the last deposited sheet by the returning gripper 7 cannot occur.

I claim 1. A sheet depositing device comprising in combination a sheet stop, a rocking lever adapted to first move the sheet downwards to the upper surface of the pile and then horizontally up to said sheet stop, a crank gearing, an elbow lever adapted to drive together with said crank gearing said rocking lever utilizing the retardation occurring near the dead centres for the last portion of the sheet depositing travel, a gripper system, a lever to. which said gripper system is attached oscillatably mounted on the end of said rocking lever, a roller on the end of said lever, a groove guide adapted to guide said roller, a cam disc adapted to regulate the vertical position of said groove guide, and transmission elements adapted to transmit the novement of said cam disc to said groove 2. A sheet depositing device as specified in claim 1, in which the cam disc has a cam adapted through the intermediary of the transmission elements to guide the gripper system back into its initial position in raised position above the pile after a sheet has been de osited.

J n testimony whereof I'afiix my signature.

REGINALD WICHMANN.