Patent GB-476523-A (GB)
Title: Improvements in calipering devices for sheet feed mechanism
IPC: B65H7/12
Filed: 1936-06-09
Abstract: 476,523. Feeding sheets. CROWN CORK & SEAL CO., Inc. June 9, 1936, No. 32787. Convention date, June 10, 1935. Divided out of 476,502. [Class 100 (ii)] Stopping and like arrangements.- Relates to a sheet calipering or gauging mechanism which is especially applicable to sheet-feeding machines as described in Specification 476,502, in which sheets fed by suction separators from a pile 51 are advanced by feed rollers on the same shaft as a gauge roller 64a. While passing over the roller 64a the sheets are operated upon by the calipering mechanism which permits single sheets to be advanced to the printing-machine by means of driven feed rollers, and causes double sheets to be acted on by a reject member 68 to direct the sheets to a shelf arranged below the member 68, but if more than two sheets are engaged by the calipering mechanism a clutch is actuated to stop the feeding apparatus. The gauge roller 64a is arranged outside the feed roller, and is of slightly larger diameter so as to bend the sheet upwardly to a slight degree. The sheets pass under a roller 280 arranged above the roller 64a and mounted in a spring-pressed lever 278 pivoted to a gauge lever 277 which is depressed by a cam at regular intervals. The thickness of the sheets beneath the roller 280 determines the position of a trigger 284 which is connected to the lever 278 by means of a rod 281. The trigger 284 is arranged to control the movement of a pair of toggle levers 301, 302 which are periodically acted upon by a cam 300 tending to raise the toggles to the position shown by dotted lines, and, when the cam permits, a spring 299 tends to depress the toggles and the position of the trigger 284 determines the extent of depression of the toggles. If only one sheet is passing, the top of the trigger engages the outer end 311 of a drop lever 310 which is keyed to a sleeve freely mounted on a clutch-operating shaft 276. The toggle member 302 is keyed to the same sleeve and the toggle is not depressed sufficiently to cause actuation of the reject member 68, which thus permit the passage of the sheet. If, however, at any time of the sheet feed two sheets pass below the roller 280, a shoulder 288 on the trigger engages the end 311 of lever 310 as shown in Fig. 1, and the lever 310 is depressed sufficiently to operate by means of a spring 323 an arm 318 on a sleeve 319 connected by a lever 326, link 327, and lever 328 to the shaft 250 of the reject member 68 which is raised into the path of the sheets. If more than two sheets at a time pass beneath the roller 280, the trigger 284 is moved out of the path of the arm 310 and the toggle 302 is depressed to such a position that a shoulder on it operates a lever on the shaft 276. An arm on the shaft 276 is thus moved to cause a key to move in an inclined key-way formed in a pawl hold-out member, which is thus moved axially and disengages a spring-pressed pawl carried by a driven member from driving- engagement with a recess in a wheel by means of which the feeding mechanism is driven. The clutch-operating shaft 276 may be operated by a hand-lever.