Patent GB-601140-A (GB)
Title: Improvements in or relating to printing machines
IPC: B41F21/14
Filed: 1945-11-19
Abstract: 6 0 1,14 0. Printing machines; feeding sheets. LINOTYPE & MACHINERY, Ltd., and SPENCE, F. Nov. 19, 1945, No. 30982. [Classes 100(i) and 100(ii)] A printing-machine provided with means for feeding, registering, and delivering a sheet and having an impression cylinder movable into and out of printing position is constructed so that the feeding, registering, and delivery mechanisms are mounted on a support which is moved in accordance with movement of the impression cylinder, said mechanism continuing in operation independently of the position of the impression cylinder and support. As applied to a cylinder machine of the kind described in Specification 601,141, an impression cylinder 8 which is mounted in eccentric bearings 6 in a frame 5 is formed with feed frames 10 slidably secured in guideways 9 in the upper part of each frame member 5, a link 11, Fig. 2, connected to each frame 10 being formed with a lower end 12 embracing a boss 13 on the bearings 6. The sheets are fed by a swinging suction gripper 21 to a feed-board 16 which is reciprocated by a forked lever 19 actuated by a cam 20 on the cylinder 8, and are registered by front guides 29, Fig. 2, on arms guidably connected to arms on a shaft 22 mounted in bearings 22a in the frames 10 and oscillated by a cam 35 on the gear 36 of the cylinder 8. The front guides 29 cooperate with under guides 28 attached to arms 37, Fig. 2, on a square shaft 27 mounted in the frames 10, which also are provided with bearings 24a for a sprocket 25 of a delivery chain 26. The sheets on the board 1b are acted upon by a sideregistering device 47 carried by an oscillating arm 53 which moves the device 47 so as to engage a side edge of the sheets by means of a projection which engages in a transverse recess in the board 16. The arm 53 is connected by a spring-plunger 54, Fig. 8, to a lever 53a adjustably clamped to a sleeve 46 on which the device 47 is mounted. The sleeve 46 is connected to a reciprocating rod 50 which is actuated from a cam 69 secured to the impression cylinder gear, and the sleeve 46 oscillated about the rod 50 by means of an arm 68 on a sleeve 48 freely mounted on the rod 50 and oscillated by means of a cam secured to the boss of the gear 36. A pin 67 transfers rotary motion to the sleeve 46 and arm 53 while permitting sliding motion of the sleeve 46, Springs 61, 63 control the sliding motion of the sleeve 46. The sheet when registered is held in position until taken by the grippers 18 of the cylinder 8 by means of drop guides 31 actuated by a cam on the impression cylinder and adjustable lever connections. The impression cylinder bearings 6 can be rotated so as to trip the impression by means of adjustable links 86 which can be operated by trip mechanism controlled by a hand-lever 117, Fig. 16, or by vacuumoperated means which trip the cylinder 8 if a sheet is not gripped by the cylinder grippers 124. The links 86 are connected to eccentrics 88, Fig. 1B, on a shaft 89 which is geared to a shaft 92 fitted with a disc 93 formed with four slots 94 adapted to be engaged by a pawl 101 mounted on a lever arm 99 which is freely mounted on the shaft 92 of the disc 93. Normally when the impression is on a trip cam 96 controlled by a lever 110 prevents the pawl 101 from rotating the disc 93, but a cam 112, Fig. 1B, can operate the cam 96 and cause the pawl 101 to engage a notch 94 and rotate the shaft 92 through a quarter of a revolution, and this by gears 91, 90 rotates the shaft 89 through a half of a revolution and so causes the eccentrics 88 to move the links 86 and rotate the eccentric bearings 6 to trip the impression. The cam 112 is either operated by moving a lever 117 by hand, or the lever 117 can be operated by a vacuum-controlled diaphragm 129 under control of apertures 125 in the gripper bar 123, Fig. 16, and apertures 126 in the gripper 124. If a sheet is gripped to close these apertures the diaphragm maintains a locking pawl 133 in contact with a notch 135 in a disc on a shaft 136, and prevents a roller 139 thereon from actuating a slotted lever 144 on the shaft of the lever 117. If a sheet is not fed the roller 139 actuates the lever 144 and the impression cylinder is tripped.