Patent GB-169000-A (GB)
Title: Improvements in sheet feeding machines
IPC: B65H3/06
Filed: 1920-06-14
Abstract: 169,000. Mills, C. K., (Dexter Folder Co.). June 14, 1920. Tripping, throw-out, and like arrangements.-A sheet-feeding device of the kind in which the sheets are separated by rising and falling combing-wheels fitted with combing rollers is contructed with two such wheels mounted in tandem in a common frame. The means for advancing the pack is made dependent on the period of activity of the combing-wheels which are raised automatically as soon as the front edge of the sheet reaches a feeler. If the top sheet reaches this feeler quickly the pack is not advanced. As shown, a pack of sheets P is fed by belts 19 over a table 20. The sheets are separated by combing-wheels 52, 56 the former of which is mounted on a shaft 43 carried in arms 45 keyed to a sleeves 47 freely mounted on a shaft 39 driven by gearing from the main power-driven cam shaft 8. One of the arms 45 is formed as a housing for the gears 40, 41, 42, which connect the shaft 39 to the shaft 43. The wheel 56 is mounted in arms 48 pivoted to the shaft 43 and provi'ded with extensions which are secured to the sleeve 47, so that both combing wheels are raised or lowered together when the sleeve 47 is oscillated by means of a lever arm 58 fitted on opposite sides with cam rollers which co-operate with concentric cams 61, 64 on the shaft 8. The cam 61 is a fixed cam and limits the action of the combing rollers to a certain period of rotation of the shaft 8. The cam 64 is freely mounted on the shaft 8 and it can act to raise the combing wheels before the time at which the cam 61 would raise them, if the sheet which has been separated reaches a pivoted feeler 93 carried by an oscillating lever 91 prior to the raising action of the cam 61. This feeler causes a pawl 97, to engage a reciprocating rack-bar 84, connected by a link 83 to a lever 76, 75, pivoted to a pin 74 on the freely mounted cam 64. The lever 75 is connected by a link to an arm 78 on a shaft 79 which is oscillated by a crank 82 on a cam 11 on the shaft 8. When the bar 84 is held by pawl 97, the lever 75 causes the cam 64 to rotate clockwise in Fig. 3 and the combing wheels are raised out of action. An oscillating arm 13, Fig. 2, which actuates a ratchet wheel 18 for advancing the feed belts 19 is either caused to actuate this feed wheel or not according to the time at which the combing rollers are raised. The arm 13 is provided with a roller 12 which is pressed towards a cam 11 by a spring 26 but when the pack is well advanced, and the sheet reaches the feeler 93 quickly, a catch 23 engages a hook 21 on the lever 13 and prevents the roller 12 from moving into the depressed part of the cam. If, however, the sheet takes longer to reach the feeler, a projection 73, Fig. 3, on the frame of the combing wheels maintains the catch 23 out of action until the roller 12 passes into the depressed part of the cam, and the lever 13 moves until it engages a stop 29 which can be adjusted to vary the extent of motion which is given to the ratchet wheel 18. At each rotation of cam 11 a projection 11<1> on the cam frees the hook 21 from the catch 28, but it is re-angaged by the same if the combing rolls are moved from the pile soon enough.