GB867036A - Improvements in or relating to pile table mechanisms for printing and like machines - Google Patents

Abstract

867,036. Feeding sheets. SCHNELLPRESSENFABRIK FRANKENTHAL ALBERT & CIE A.G. Sept. 18, 1957 [Sept. 18, 1956], No. 29329/57. Class 100(1) Pile tables:-In apparatus for raising or lowering a sheet pile quickly in a printing or like machine by motor-driven mechanism, the motor can be rotated in either direction when one of two switches 31, 32 is closed by a manuallyoperated lever 36 having two cams 37, 38 thereon, one for each switch, the switch box being provided with a safety projection 33 which prevents the cams operating both switches simultaneously. The lever 36 can be operated automatically to stop the motor by a feeler device 59, 60 when the motor has raised the top of the sheet pile 21 to the appropriate height for sheet separation, and also by an abutment screw 22 connected to the pile table support 18, and a stop member connected to one of the chains 14 moving the support 18, if the latter, in the absence of a pile, is raised beyond a certain limit. In addition to the motor, the pile table can be adjusted manually, and for normal sheet separating operations it is raised continuously by constant increments through a pawl and ratchet means driven from the printing machine. In Fig. 1, the switches 31, 32 and gear box 3 are shown swung out of their normal position to enable the connections to be shown more clearly. The pile table 20 is supported on rods carried by supports 18 slidable vertically on guides 17. The supports are connected to the chains 14 passing over sprockets 13 secured to a shaft 11 which is driven from a motor through a first worm gearing 10, 12, and a second worm gearing which drives the shaft 7 of the worm 10 through an over-running clutch 9 (not shown) controlled by the hand lever 36. The lever 36 is keyed to, but slidable along, a spindle 34 which is journalled in the gear box 3 and has secured thereto a bifurcated lever 39 adapted to control the clutch in the motor drive to the shaft 11. A bell-crank lever 40, 41 secured on the end of the spindle 34 has one arm 40 in alignment with the abutment screw 22 on the support 18 whereby when the pile table is raised too high the spindle 34 is rocked to throw out the clutch and open the motor switch 31 or 32. The other arm 41 of the bell-crank has pivoted thereto a rod 43 which passes through a swivel block on an arm 46 secured on a spindle 48. A compression spring 44 on the rod 43 forms a means for rocking the spindle 34 when the spindle 48 is rocked by the feeler 59, 60, or by a limit stop on a chain 14 engaging an arm 47 on the spindle 48, whereby the motor is stopped and the clutch disengaged. The spindle 48 is associated with a snap-over linkage which is arranged to lift the feeler end 60 clear of the top of the pile 21 to facilitate sheet separation, and holds the control spindle 34 in one of two definite positions. During sheet separation, the pile table 20 is raised by constant increments by a pawl and ratchet device on the end of the shaft 7.