Patent GB-811438-A (GB)
Title: Improvements in or relating to a sheet feeder for printing and other sheet handling machines
Inventor: SCHWEBEL ADOLF
IPC: B65H1/30
Filed: 1955-07-01
Abstract: 811,438. Feeding sheets. MABEG MASCHINENBAU G.m.b.H. July 1, 1955, No. 19132/55. Class 100(1) A sheet-feeding device having a pile raising device allowing uninterrupted feed of sheets is characterized in that the support table of a nearly used pile is engaged by latches which include switches operated by the table to domplete an electric circuit to effect movement of a part of the guides on which the table carriers run so that the latter are swung out of engagement with the table of the nearly used pile while a fresh pile is raised up. Pile raising mechanism. The pile, table 87 with a pile 57 is lifted by table carriers 88. The carriers 88 are pivotally mounted onrnembers 80 and connected to chains 3. The chains 3 are driven by shafts 4 and 5 mounted in the frame walls 1 and 2. The shafts are operated by a bevel drive 8. 9 the wheel 9 being keyed to a worm shaft 10 having fast thereon a wheel 11 meshing with a worm 12 secured to a worm shaft 13. A motor 26 is provided having a shaft 25 with a pinion 24 meshing with a gear 23. The gear 23 forms part of a clutch which connects the motor to the shaft 13 when a lever 35 on a shaft 34 is moving clockwise from the position shown in Fig. 9. Fixed to the shaft 13 is a ratchet wheel 14 which co-operates with a pawl 16 having a roller 18 which follows a groove in a continuously rotating cam 17. A lever 50 pivoted at 51 is provided to disable the pawl 16 when the motor 26 is clutched to the; shaft 13, a mechanical connection between the shaft 34 and lever 50 being provided for this purpose. The groove in the cam 17 is such that at each rotation of the cam, i.e. each time a sheet is fed from the pile, the pawl engages the ratchet wheel 14 and raises the pile unless disabled by the lever 50. A hand crank 27 is provided whereby the motor shaft 25 can be rotated manually on removal of a cover 28. Removal of cover 28 renders the motor inoperative. The table carriers 88 have rollers 84, 85 which engage in grooves 69 formed by fixed members 68 and movable members 71. When the pile has reached a certain height it is engaged by latches 103 including switches 107 which are thereby closed. Closure of the switches operates a solenoid 92 which causes pivoting of a lever 75 out of engagement with a lever 73 on a pin 72 on which the members 71 are fixed. Members 71 thus pivot clockwise as seen in Fig. 4 to allow in turn pivoting of the carriers 88 about the members 80 so that the residual pile is entirely supported on the latches 103. At this time a new pile is introduced and raised by the motor 26 until pressure is relieved on the switches 107 and they are opened. These switches are also connected in the motor circuit so that the motor is then de-energized together with the solenoid 92. During normal separation by a conventional separator 121 the height of the pile is controlled in a known manner by a feeler device 122 which, when the pile height drops a predetermined amount rotates the lever 50 clockwise as seen in Fig. 7 to allow the pawl 16 to rotate the ratchet wheel 14 and shaft 13. Sheet-registering; blowers. The pile is provided with front stops 139, rear stops 124 and side guides 126. Connected to, and adjacent each side stop is a blower tube 129 having nozzles 127 for blowing air into gaps 128 to assist in sheet separation. The new pile is positioned against bars 114 and against a side bar 116 adjustable so that the new pile is positioned correctly relative to the old pile. The new pile is run into position on a truck 119 on rails 120 after the bars 114 are withdrawn. Operation. When a new pile has been inserted into position against the stops 139 the lever 35 (Fig. 9) is rotated clockwise from the "off" position shown to the "on" position thus clutching motor 26 to the shaft 13 and causing raising of a safety latch 61 to allow movement of a lever 54 anti-clockwise. Switch 62A of the control circuit (Fig. 15) is placed on contact F of circuit A, the motor 26 being connected in circuit with switch 62A via switch 30 which is closed as long as the motor cover 28 is in position. Lever 54 is now moved to "on" position to close switch 59 and the start button P pressed. Motor 26 is thus energized to rotate the shaft 13 and causes the pile to be lifted, the pawl 16 having been disabled by lever 50 by rotation of lever 35 to the "on" position. When the pile has reached a predetermined height it contacts a rammer 56 mechanically connected to lever 54 so that as the rammer is moved upwardly it moves the lever 54 back to the "off" position thus opening switch 59 and breaking the circuit to the motor 26. The lever 35 is now moved to the "off" position to declutch the motor and release lever 50, the pile being maintained at a constant height during separation by the feeler 122. If it is desired to effect continuous separation from successive piles the switch 62A is now moved to contact G of circuit B. The old pile is raised until the table 87 rests on the latches 103 and thus closes switches 107. Closure of switches 107 completes a circuit to the solenoid 92 energization of which pivots the lever 75 to release the guides 71 and allow the table carriers 88 to pivot about the members 80 and also pivots levers 142 to close switches 143 and complete a circuit to the motor 26. Lever 35 is then moved to the "on" position to clutch the motor to shaft 13 and a new pile, previously introduced beneath the old pile, is raised until it contacts the bottom of the old table 87 and releases the pressure on the switches 107 allowing them to open. Opening of switches 107 de-energizes solenoid 92 and motor 26 and the lever 35 is again moved to the "off" position. The old table 87 is manually removed and is provided with a bevelled edge 123 (Fig. 13) to reduce interference with sheet separation. The motor shaft handle 27 is used to ensure correct positioning of the first pile after operation of the rammer 56.