Patent GB-240145-A (GB)
Title: Improvements in and relating to sheet feeding and delivery devices for printing presses
IPC: B41F3/00
Filed: 1925-08-29
Abstract: 240,145. American Type Founders Co., (Assignees of Kelly, W. M.). Sept. 19, 1924, [Convention date]. Cylinder machines; inking-apparatus; gripper mechanism.-Cylinder printing-machines, more particularly those of the type described in Specification 186,586, are constructed so as to feed and deliver the sheets automatically, and the control of the impression is governed by a feeler device to stop the press when a sheet is not fed correctly. The machine is constructed with improved gripper mechanism, and with an improved construction of impression cylinder and means for driving the same. The inking-apparatus is constructed with means for tripping the fountain roller when the impression is checked, for raising the frame carrying the ink-applying rollers, and to permit easy removal of the ductor roller. The feeding and delivery apparatus are mounted in a common frame 112, 113, Figs. 1 and 5, movable relatively to the main frame 10 of the machine, and so arranged that the drive of the feed mechanism is not disturbed when the frame is withdrawn. The sheetfeeding devices are improved as to the construction of the pneumatic separator and associated sheet guiding, controlling, and side-registering devices. The machine has a readily adjustable calipering device to prevent double feed, a pump to control the suction driven from the main shaft of the press, and front stops supported under the feed board and operated by mechanism also arranged under the feed board. The delivery apparatus comprises a stripper, rollers which are tripped out of contact with the impression cylinder, and knocking-up devices on the delivery table. The machine may be set while in motion from a single to a double-rolling press, and is under the control of automatic stopping devices for either setting. When double-rolling occurs, the feeding-apparatus is arranged to feed one sheet for each double reciprocation of the bed. The sheets pass over a feed board 197 and are taken by grippers 58 on the impression cylinder 34, with which coacts a bed 36 reciprocating in inclined guide ways. The cylinder 34 is mounted in eccentric bearings 43 in a housing 32, the bearings 43 being operable to trip the cylinder by a rod 54 and lever mechanism. This lever mechanism and also the means for oscillating the cylinder from the bed are the same as described in Specification 259,595. The grippers are operated to open and close quickly as described in Specification 259,597, and the bed is inked by rollers 80, associated with other rollers which are constructed and are adapted to be tripped as described in Specification 259,596. The printing mechanism and also the feeding and delivery mechanisms are driven from a shaft 17 in gear with one of two wheels 20, which reciprocate the bed by means of a pitman 24<a>. The shaft 17 drives by means of spiral gearing an inclined shaft 120 which is splined to its driving- gear in such a manner that it remains in gear when the frames 112, 113 are wthdrawn. The shaft 120 drives by bevel gearing a shaft 119, Fig. 12, for operating the feeding and delivering mechanisms. The shaft 119 is connected by spur-gearing to a shaft 130 which operates the feed and delivery rollers. Stopping and tripping arrangements. - The sheets as they approach the front stops are acted upon by a feeler device 261, Fig. 12, arranged below the feed board, and this feeler device controls a stopping-arrangement for the press and the feeder, which is brought into operation if a sheet is not fed correctly. The stopping mechanism is similar to that described in Specification 184,176, and comprises a dog 272, Fig. 1, pivoted to an oscillating lever 273. A pin 271, Fig. 14, controlled by the feeler 261 moves the dog into or out of contact with a rod 274, and if the rod 274 is operated it depresses a lever 275 and may operate a switch 280 for cutting off the driving-current, and also disconnects a link 48 from its operating lever 47, and thus prevents the impression from being thrown on. The lever 275 engages a pin 284a on a rod 284 connected to an arm 285 on the valve shaft 140 of the suction feeder, and operates to prevent the feed of a subsequent sheet if a sheet fails to reach the front stops correctly. For double rolling a star wheel 287 is moved to the dotted line position, Fig. 14, and this wheel is rotated a quarter of a revolution for each operation of the machine. The long arms of the star wheel prevent operation of valve 140, and thus sheets are fed only for alternate operations of the machine. This mechanism co-operates with a rod 293 parallel to rod 274 fitted with a pivoted dog 295, which for single rolling is in the retracted position shown in Fig. 1. For double rolling the dog is swung clockwise to form an extension of rod 293, and the mechanism acts as described in Specification 184,176 to cause sheets to be fed for alternate operations of the machine only, but the machine is tripped if the alternate sheets are not fed when due. To prevent double feed to the feed board a pivoted curved tongue 158, Fig. 12, is arranged near a guide plate 164 adjacent to the wheels 129, and this tongue can be set to allow sheets of a predetermined size to pass readily on to the board 197. The tongue 158 is in pivoted plate 157 acted on by a spring tending to move the tongue away from the plate. A laterally adjustable screwed member 163 is provided having a tapered end which engages an arm integral with the plate 157, Fig. 20. By moving the member 163 laterally, the tongue 158 is moved to and from the plate 164. Specification 194,294 also is referred to.