Patent GB-180438-A (GB)
Title: Improvements in and relating to sheet-feeding apparatus
IPC: B65H3/06
Filed: 1921-02-24
Abstract: 180,438. Brasseur, E. J. Feb. 24, 1921. Sheet-separators; pile tables and supports; dropping-roller and like feeds.-A sheet-feeding apparatus, which is especially applicable for rotary duplicators, and is of the type in which the top sheet of a pile is separated by a buckling roller engaging the front of the top sheet of a pile and a pressing device arranged to bear on the pile behind this roller, is constructed so as to be capable of adjustment for dealing with sheets of different thicknesses, and of different qualities. In the machine shown the rotation of a handle effects adjustments for simultaneously controlling (a) the distance of the pressing device from the buckler, (b) the pressure between the buckler and the sheets, (c) the duration of the time of action of the buckler. The adjustments may, however, be effected independently. The sheets are fed from a table formed with a pivoted front part 5, Fig. 4, which is normally kept raised towards a series of buckling-rollers 10 on a shaft 11 above which is arranged a feed roller 13 which assists to forward the separated sheet. The front edge of the pile is arranged beneath a plate 9, and the top sheet is withdrawn thereform when the rollers 10 and a rod 12 press on the pile. The effect the adjustments (a), (b), (c) a handle 18, Fig. 3, is turned and this operates via bevel gears 20, 21, screw 22, nut 25, link 26 to rotate a disc 29 upon a shaft 30. This disc 29 is fitted with a pointer 17 movable over a scale to indicate the direction of adjustment required for " thick," or " thin " sheets. The disc 29 effects the various adjustments as follows : (a) the rod 12 can move in slots 54 in a frame 55, the rod being connected to links 58, 58<1>, connected to a linkwork system comprising levers 59, 59', links 64, 64<1>, and levers 65, 65<1> on a shaft 66. Lever 59 is connected by a link 61 to disc 29, and rotation of disc 29 causes the rod 12 to move in slots 54 either towards or from the rollers 10; (b) the disc 29 is fitted with a cam 79 acting on a lever 77 which controls the tension of a spring 73 acting on an arm 72<1> on a shaft 71. An arm 70 on this shaft is fitted with a roller 72 acting on a slotted plate 69 attached to the pile table 5, and the pressure with which this table is pressed towards the rollers 10 depends on the tension of spring 73 which, as stated, depends on the position of cam 79; (c) the table 5 is depressed periodically by a cam 41, Fig. 3, which is freely mounted on shaft 30, and is oscillated by a link, and camactuated bell-crank lever 51. The cam 41 acts on a roller 84 on an arm 80 on a shaft 81, and the time that the raised part of cam 41 acts on roller 84 depends on the position of disc 29. The disc 29 carries a pinion 38, which gears with a toothed sector 32, and the shaft of the pinion 38 also carries a pinion 39 which gears with a pinion 40 on cam disc 41. Rotation of disc 29 thus adjusts the position of cam 41. The motion of shaft 81 is transferred to shaft 71 for raising and lowering table via a spring-pressed arm 87 freely mounted on arm 71, the arm 87 being connected to a pawl-carrier 92 acted on by a spring to cause a pawl 94 to engage a rack 86 on an arm 85 fixed to shaft 71. As the pawl carrier is moved upwards on release of the table depressing-means, a fixed bracket 96 disengages the pawl from the carrier.