Patent GB-764701-A (GB)
Title: Improvements in or relating to skiving machines
IPC: C14B11/00
Filed: 1954-04-09
Abstract: 764,701. Skiving-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and CHOICE, F. C. April 7, 1955 [April 9, 1954], No. 10427/54. Class 31 (1). A skiving-machine comprises a rotary knife 5, Fig. 1, a yielding feed roll 3 for feeding a work-piece to the knife and pressing it against an adjustable work guide 1, means for adjusting the work guide heightwise and/or angularly whereby to vary the thickness and/or angle of the cut, and operator-actuated mechanism connected with such means for causing the work guide to be moved alternately from one predetermined setting to another on successive movements in the same direction of an operator-actuated member (e.g. a treadle) and to be retained in each of such settings in turn until the operator-actuated member, having returned to its initial position after having once been actuated, is again actuated.. The guide 1, Figs. 1 and 3, is pivoted on a rounded lip 11 on a carrier 13 having a depending stem 15 which is adjustable in an inclined bearing 17 against the action of a spring 19 to set the guide at either of two predetermined heights by means of a bell-crank 29; the bell-crank has a toothed connection 25, 27 with the carrier 13 and is moved to each of its two positions corresponding to the two height settings of the guide by its engagement with one end of a horizontallymovable thrust rod 41. The guide may also be set into either of two predetermined angular positions on the carrier by a second thrust rod 97 acting upon a bell-crank 89 connected by a link 91 with an arm 83 which depends from the guide and has a rib 85 movable in an arcuate track in the carrier; a spring-biased lever 94 engages the arm 83 and urges the bell-crank into contact with the end of the thrust rod 97. Both thrust rods extend from the bell-cranks 29, 89 for control by a snap-over member 61, Figs. 1 and 5, which can be snapped about its pivot 63 into either one of two positions. For the actuation of the thrust rod 41, the member 61 is provided with two rolls 45, 47 on two relativelyinclined bars 53, 55 and arranged so that one roll is effective upon a crosshead 43 on the thrust rod 41 when the member 61 is in one position and the other roll is similarly effective when the member 61 is snapped to its second position; the bars 53, 55 are adjustable axially by screwthreaded means 79, 81 to vary the radial positions of the rolls and hence the corresponding heightwise settings of the guide 1. The thrust rod 97 is similarly operated by the member 61 through two rolls (of which only 101 is shown on Fig. 5) acting on axially-adjustable bars. By suitably adjusting the radial positions of the four rolls, movement of the snap-over member from one position to another can therefore result in the guide 1 being adjusted for height only, angle only or both height and angle. The member 61 is snapped over from one position to the other by the alternate action of two horizontally-slidable push rods 135, 137, Fig. 5, upon rolls-131, 133 mounted on the member, and the action of these rods is completed by a spring toggle 111 connected to the member 61. The rods 135, 137 are alternately actuated by the depression of a treadle which acting through a link 187 rocks, against the action of a spring 185, a bell-crank 179 pivotally supporting in its upper arm a whipple tree 177 carrying rolls 169, 171 engaging in slots in the push rods. The necessary movement of one arm of the whipple tree to actuate the corresponding rod is achieved by preventing movement of the other rod by means of a vertically-slidable stop bar 129 which works in association with the spring toggle 111. The rod 135 extends through an opening 160 in the bar 129 and has a stop face 161 which engages the bar when the latter is lowered, and the rod 137 has a stop face 163 which engages the upper edge of the bar when the latter is raised. The toggle 111 consists of a spring- loaded link having one end pivoted to the member 61 and the other end slidably received in a trunnion block 119 which has a pin-and-slot connection with one arm of a lever 123, the other arm of which has a ballshaped projection engaging a hole in the bar 129. With the member 61 in the position shown in Fig. 5, depression of the treadle results in clockwise movement of the bell-crank 179 and, since the bar 129 is at this time lowered to stop the rod 135, movement of the upper end of the whippletree to actuate the rod 137 so that the member 61 is moved clockwise sufficiently far to allow the toggle 111 to snap it over to its other position ; the stop bar 129 is thereby raised so that it blocks movement of the rod 137 instead of the rod 135 and the next depression of the treadle results in the return of the member 61 to its initial position. Specification 416,352 is referred to.