Patent GB-815920-A (GB)
Title: An improved feed mechanism for book trimmer machines
IPC: B26D7/06
Filed: 1956-04-11
Abstract: 815,920. Book trimming machines. WALLS, F. A. April 11, 1957 [April 11, 1956], No. 11003/56. Class 31 (1). [Also in Groups XXIV and XXXIV] A device for feeding books or similar articles to a three-knife trimming machine comprises a feeder device, means for imparting a reciprocating feed motion to the feeder device and control means for initiating the trimming operation only when books or similar articles are being fed to the trimming position. As shown, a reciprocable slider member 26 supports a book holder 27 which is provided with a spring-actuated pivotally-mounted presser bar 31, Fig. 2, adapted to press on a pile of books 15 to be trimmed, the presser bar having a depending arm 32 operatively linked thereto. The slider 26 has a nose part 34 adapted to engage an adjustable stop 35 of a lever 36 freely mounted on a shaft 37 but adapted to be coupled therewith by means of an electromagnetic device, Fig. 9 (not shown). When no books are present beneath the presser bar 31, the arm 32 actuates a switch 33 which in turn actuates the electromagnetic device so that when the nose part 34 strikes the stop 35, the lever 36 is displaced without, however, actuating the shaft 37. Conversely when books 15 are present, the presser bar 31 is raised and the arm 32 does not actuate the switch 33 and hence the lever 36 is coupled to the shaft 37 so that the latter is actuated by the nose part 34. The shaft 37 is coupled to the operating means for a onerevolution clutch driving the trimming mechanism so that the latter is operated only when books 15 are present beneath the presser bar 31. The trimming mechanism comprises a presser 17 and side and front trimming knives 18, 19. The slider 26 is operated by a depending lever 52 actuated from a driving pin 54 on a driving disc 55 by means of a connecting rod 56. A shaft 61, Fig. 5, is driven from the main driving motor 20, Fig. 1, of the trimming machine by means of a clutch 58 which is operatively connected to a pedal control 66, Fig. 3, and to a hand-operating knob 67. The shaft 61 drives a gear reduction mechanism which is connected to the input shaft 77 of a change-speed gear 78 comprising spur gears 781 to 784 meshing with further gear-wheels 791 to 794 adapted to be selectively coupled with an output shaft 81 by means of a selector lever 82 adapted to be actuated by a rocker lever 85 by a selector knob 86. The driven shaft 81 actuates the disc 55 through an intermittent drive mechanism comprising a driving disc 89 having two pairs of driving pins 93, Fig. 7, a part-toothed wheel 88 having toothed sections between the pins 93 of each pair of pins, a slotted Geneva-type wheel 94 engageable by the pins 93 and a partly-toothed pinion 96 rigidly coupled to the wheel 94 and adapted to come into mesh with the toothed sections of the wheel 88, the wheel 94 being keyed to a shaft 95 on which the disc 55 is mounted. The wheel 94 has curved surface portions 98 adapted to hold the wheel 94 from rotation during its idle periods, by engaging concentric surface portions of a disc 91 coupled to the driving disc 89. To assist in holding the shaft 95 stationary when the Geneva wheel 94 is not being driven, a brake device is employed comprising a brake wheel 101 engageable with a segmental brake member 102, Fig. 8, carried by a spring- influenced pivotally-mounted lever 103 provided with a follower 106 engageable with a cam 107 mounted on the shaft 81. The feed table 13 is provided with adjustable side lay means 114 controlled by means of a further cam 109 on the shaft 81, the cam engaging with a follower 110, Fig. 3, on a centrally pivoted lever 111 operatively connected to the side lay means. The operating mechanism including the clutch 58, change speed gear 78 and intermittent drive mechanism are accommodated upon a channel member 51 bolted to the frame of the machine.