Patent GB-763834-A (GB)
Title: Improvements in or relating to sheet conveyors
Inventor: TEBBS GEORGE WILLIAM
IPC: B65H5/16
Filed: 1953-10-08
Abstract: 763,834. Feeding sheets. BACKHOUSE, H. T. Sept. 1. 1954 [Oct 8, 1953], No. 27658/53. Class 100(1) A sheet conveyer for forwarding sheets over a horizontal or sloping table, e.g. the feed table of an addressing machine comprises one or two pairs of parallel spaced tapes or cables 119, 120 (only one pair being shown in Fig. 2) which are reciprocated in opposite directions and carry abutments adapted to engage the edge of the sheet and displace the sheet when moving in the forward direction and to ride over the edge of the sheet without displacing it when moving in the opposite direction. Each pairo f tapes is connected to a driving pulley 114 adjustable along a transverse shaft 113 so as to accommodate sheets of different sizes. From the pulley 114 the tapes are arranged to pass closely over the table 111 and are connected to a corresponding pulley 118 at the other end which is mounted on a bracket 116 adjustable along a bar 115 so that pulley 118 may be aligned with pulley 114. The pulleys 114, 118 are each formed with a pair of peripheral grooves to receive the tapes 119, 120. Each tape 120 passes downwardly from the upper side of pulley 114, under a jockey pulley 122, along the table parallel to tape 119, under a jockey pulley 125 and upwardly for connection to the corresponding pulley 118. Tape 120 therefore moves in a direction opposite to tape 119. Adjustable hooks 126a, 126b on the tapes rub backwards and forwards as the shaft 113 is oscillated, either rubbing on the surface of the table or running in shallow grooves therein. The hooks may be resilient. The conveyer is adapted to be driven from the movements of the presser head 112 of the addressing machine. To this end a gear 128 mounted on the shaft 113 meshes with a gear 130 on shaft 132. A forked arm 134 on shaft 132 co-operates with a pin 138 on a bell-crank lever 136 pivoted about shaft 123. Lever 136 is connected by links 140 and 141 to the presser head 112 so that as the head descends the pin 138 engages in the fork and turns the arm 134. This causes rotation of pulleys 114 and movement of the tapes. Hooks 126a on tapes 119 engage a sheet presented to the conveyer (e.g. by the "first conveyer" described in Specification 763,833), and forward it to the printing position under the presser head. The tapes then stop because pin 138 is arranged to pass out of the fork in arm 134 at this point so that the sheet is stationary while printing is effected. Upward movement of the arm after printing causes reverse rotation of pulleys 114 and reverse movements of the tapes. Hooks 126b on tapes 120 now engage the sheet and displace it out of the printing position. If more than one impression is to be made on each sheet, the sheet is only displaced a predetermined small distance, only part of the stroke of the forwarding hooks being used for the sheet forwarding movement. To prevent the pulleys 114 overrunning the predetermined limiting positions a brake disc 142 is attached to shaft 113 and a brake shoe 144 is provided bearing against the disc. The shoe is forced into braking engagement with the disc at each end of the movement of the conveyer by stop screws 146, 147 on arm 134. Overrunning is thereby prevented and the sheet is brought accurately to the desired position at the end of each movement of the conveyer tapes.