Patent GB-497426-A (GB)
Title: Improvements in sheet delivery apparatus for printing machines
IPC: B65H29/04
Filed: 1937-06-14
Abstract: 497,426. Sheet-delivery apparatus for printing-machines. DRESDEN-LEIPZIGER SCHNELLPRESSEN. FABRIK AKT..GES., and LANG, K. T. June 14, 1937, No. 16449. [Class 100(i)] In sheet - delivery apparatus for printing. machines in which the main gripper - conveyer 45, Figs. 1 and 22, can be coupled to one of two suceeding conveyers 106, 34<1> for delivering sheets to either of two tables 150, 151, the drive between the conveyers 45 and 106, 34<1> comprises two members which, after manual release, are held in engagement by a spring and by their subsequent relative movement cause a rotating gear to be moved into and out of driving position during one revolution thereof. The sheets may be delivered alternately to the tables 150, 151, or a proof sheet may be diverted to the table 151 when the sheets are being delivered to the table 150. As shown, the conveyers 45, 106 are endless gripper-chains and the conveyer 34<1> is a gripper-cylinder. The conveyer 106 is driven continuously from a gear 49, Fig. 2, and the gear 34 of the conveyer 34<1> is coupled when desired to a gear 7 slidable on the shaft 3 of the gear 49. Integral with the gear 7 is a sleeve 8 and a disc 9, the latter having a gap 10 bounded at one end by a wedge-shaped part 11 and at the other end by a pivoted block 13 having sloping sides 14, 15. The parts 7, 8, 9 are urged by a spring 20 against a shoulder on the shaft 3. Adjacent to the extension 5 of the shaft 3 is mounted a headed-pin 22 carrying a slidable member 23 spring-urged towards the head 25 and normally held retracted by a catch 31 engaging a pawl 29 on the member 23. A roller 28 is rotatably mounted on the member 23. In order to throw the conveyer 34<1> into operation, the catch 31 is retracted, and the member 23 moves under spring action until the roller 28 engages the side of the disc 9. During its rotation, the part 11 of the disc 9 allows the roller to move into the gap 10 where it takes up a position along the central plane of the disc. Subsequently, the roller engages the face 15 of the block 13 so as firstly to move the disc 9 and with it the gear 7 to the left, Fig. 2, to effect engagement of the gears 7, 34 and secondly to tilt the block 13 so that the face 15 becomes parallel to the face of the disc. The gears 7, 34 thus remain in mesh until the disc completes a revolution and the gap 10 allows the spring 20 to move the parts 7, 8, 9 to inoperative position. During subsequent rotation of the disc 9. the face 14 of the block 13 engages the roller 28 and moves the member 23 back to its initial position with the catch 31 engaging the pawl 29. If, however, the catch 31 is held retracted, the conveyer 34<1> continues to operate at alternate revolutioms. In order that the roller 28 can come into operation only at a certain position in the rotation of the members 7, 8, 9, the member 23 is normally held retracted by the engagement of a laterally-extending lug 55 thereon with an arm 53 of a lever 52 which is operated by a cam part 50 on the disc 9 so as to release the member 23 at the correct moment. Devices to ensure smooth engagement of the gears 7, 34 are provided, and for this purpose teeth are omitted from the gears at the parts of their peripheries which are adjacent to one another when the devices 28 and 9 start to operate. A lever 37 normally held stationary by an arcuate surface 43 thereon engaging a cylindrical part of the member 9 has a forked end 39 engaging a pin 40 on the gear 34 to prevent rotation of the gear. When the members 7, 8, 9 move to the left, Fig. 2, the part 43 is released and a roller 41 on the lever moves into a cam-groove 42 on the gear 7 so that the lever is oscillated and starts the rotation of the gear 34. When the gear 34 completes a revolution, the forked-end 39 again engages the pin 40 and brings the gear to rest. In a modified arrangement, a roller 60, Fig. 18, which is the equivalent of the roller 28, is carried by a bell-crank lever 62 normally held inoperative by a spring-catch 64. A spring-pressed rod 66 attached to the lever 62 and having a shoulder 70 engaging a guide 67 prevents the roller 60 moving into operative position after release of the catch until the cam part 50 of the disc engages a roller 69 thereon and releases the shoulder. The conveyers 45, 341, 106 carry grippers 109, 109<11>, 109<1> respectively, and in order that the alternate deliveries may be achieved, the grippers 109, 109<1> must open and close respectively at position I and the grippers 109<11> remain open during one revolution, and the grippers 109, 109<11> must open and close respectively at position II during the next revolution. For this purpose, two cams 113, 114 are slidably but non-rotatably mounted on the shaft 5 and move axially with the disc 9 so that the cam 114 operates on the gripper-roller 111 at the point shown for delivery to the grippers 1091 and the cam 113 operates on the gripper-roller 111 when the gripper 109 is adjacent to the gripper 109<11> for the alternate delivery. Corresponding cams 115, 116 control the grippers 109<11> and are linked to the cams 114, 115 by a lever 126 so as to be moved in unison therewith.