GB597346A - Sheet feeding apparatus - Google Patents

Abstract

597,346. Sheet-feeding apparatus. DEXTER FOLDER CO. Aug. 1, 1945, No. 19819. Convention date Nov. 18, 1944. [Class 100 (ii)] A calipering device for stopping the action of a sheet-feeding apparatus if more than one sheet is fed at a time to a printing or like machine is described in connection with a stream feeder in which the sheets are fed by rollers 13, 14, Fig. 1, and tapes 15 over a feed board 16 to front stops 24, and the calipering device is arranged to act on the forward edge of a sheet after the preceding sheet has been taken by the oscillating gripper 28 for feeding to the machine The calipering device comprises a roller 37 which is rotated intermittently through angles of 120 degrees, and is formed with three projecting surfaces 39 which engage the sheet when the roller 32 rotates, the surfaces 39 being separated by recesses 38 which permit free passage of the sheet when the roller 37 is stationary. The roller 37 coacts with a calipering segment 89 mounted in a lever 91 which can be adjusted by a screw 97 and locknut 101 to set the segment 89 to permit the passage of one or more sheets between the surfaces 39, 89 without rotating the segment, but, if additional sheets are present when the roller 37 is rotated, the segment 89 is moved clockwise, Fig. 5, and an arm 102 moves with it and permits a spring-controlled pendulum device 103 to follow-up the motion of the segment, and an eccentric member 104 is moved into the path of a reciprocating feeler member 108 shown in Fig. 7 as being moved counterclockwise. The member 108 is actuated by cam-and-lever mechanism from a cam 131, Fig. 1, driven from the printing-press, and when the feeler 108 is arrested the roller 130 of the cam mechanism is prevented from following the. low part of the cam. A shaft 120, Fig. 1, forming part of the lever-and-link mechanism, actuates mechanism for stopping the feeder and tripping the press, when its rocking movement is interrupted. The caliper member 89 is held in tripped position by a gravity pawl 138 which engages a tooth 139 to hold the member 89 in its displaced position until the mechanism is reset by hand. The roller 37 is mounted in ball bearings in a bracket 32 which can be adjusted laterally of supporting brackets 31 to accommodate sheets of different widths. The roller 37 is geared to a wheel which is intermittently rotated by a ratchet and pawl on a rocking lever, a spring-controlled stopping- device being used to ensure that the roller 37 rotates 120 degrees for each oscillation of the pawl lever.