Patent GB-146366-A (GB)
Title: Improvements in sheet feeding machines
IPC: B65H3/06
Filed: 1920-07-02
Abstract: 146,366. Christophel, C. E. Sept. 19, 1917, [Convention date]. Tripping and like arrangements.-Sheet-feeding devices of the kind in which sheets are separated from a pile by the action of oombing-rollers are so constructed that the combing-rollers, which are independently actuated, control by their action the means for raising the pile automatically. This controlling-means comprises pivoted fingers actuated by the advancing sheets to control the raising of the combing-rolls from the pile, and according as the sheets reach these fingers quickly or slowly, the pile is prevented from rising, or is raised. As shown in Fig. 2, the pile 109 is supported by a table 7 carried by rollers 5 on carriages 4 which are carried by counterweighted chains 9. A feed-table 177, Figs. 6 and 7, on a support 178, carried by shafts 179, 180, is arranged in front of the pile, and the combing- rollers 58, which are carried in pivoted arms 56 and are driven continuously by sprocket gearing, distribute their pressure over the sheets on the pile and those which are combed on to the table 177, the arrangement being such that the top sheet is advanced less quickly when few sheets are combed on the table 177. From the table 177, the sheets pass to a continuously-driven roller 62 with which cam-actuated drop rollers coact to advance the separated sheet. The roller 62 is carried by a power shaft 61 which is geared by toothed gearing to a cam shaft 43, and to the shaft which drives the combing-rollers. The means for controlling the actuation of the pawl 35 bv the rod 36 comprises a pawl 49 on a shaft 50 which is controlled by a depending arm 52 controlled by a roller 55 on an arm 56 of the combing-roll. The arms 56 are raised to the position shown in Fig. 7 at each actuation of the machine by a cam 106 on shaft 43 which acts on a roller 79 on an arm 78 integral with the arms 56. When the cam 106 permits the arms 56 to lower the roll 58, the roller 55 acts on a straight end of the lever 52 and raises a pawl 49 from the path of a shoulder 48 on the link 38 which operates the pile ratchet. If the pile is low, the pawl 49 remains out of engagement with the shoulder 48, and the pile is raised. If, however, the pile is at about normal height the action of the pile-raising means is dependent on the time the sheet reaches a pivoted finger 100. This finger controls the bringing into action of a freely-mounted auxiliary cam 80 on the shaft 43, and if this cam is brought into action to engage a second cam roller on the arm 78 at an early period, the arms 56 are raised in time to release the pawl 49 to check the link 38, and thus prevent the action of the pile-raising means. There are two fingers 100 which operate independently; and each is integral with a pawl 96 which is caused to engage a rack 95 when the finger is moved by the sheet about its pivot 97, which is carried in a rock arm 98 operated by a cam to raise the fingers periodically out of the path of the sheet. The engagement of rack 95 by means of the pawl 96 causes a chain or cable 84 which is attached to the rack to move cam 80 in a clockwise direction, Figs. 6 and 7. This chain passes around a pulley 93 and one 83 freely mounted on the cam shaft, and around a pulley 82 carried by a pin 81 on the cam 80. The cable is attached to an oscillating arm 86 actuated by a crank from the shaft 43. Normally the cable can move without moving the cam, but when the bar 95 is held by the pawl, the arm 86 tends to straighten out the cable and the cam 80 is thus moved. The cam 80 is provided with a rear camarm 104 with a recess 105 in which the roller 79 is held to hold the combing-rolls in lowered or active position after the action described above has taken place, and until the cam 80 is returned by the cable 84.