Patent GB-1021038-A (GB)
Title: Presser foot for high speed skiving machine
Inventor: BLACK EDWIN H
IPC: C14B1/22
Filed: 1964-02-21
Abstract: 1,021,038. Skiving machines. MANUFACTURERS SUPPLIES CO. Feb. 21, 1964, No. 7434/64. Heading B4B. A skiving machine for producing plain or grooved skives comprises a rotatable knife 12, Fig. 1, rotatable feed roller 15 to engage one side of a work blank and move it to the knife, a presser foot 20 having a working face 55 to engage the other side of the work blank, and an edge guide 59 and grooving finger 64 which are mounted on the presser foot for setting according to the operation desired. The presser foot is mounted on an eccentric pin 46 at the lower end of rod 27, Fig. 3, mounted in a head 18 and adjustable by a handle 22. The grooving finger 64, Fig. 3, is mounted in a slot 65 in the back face of the foot 20 and is held in adjusted position by a wing nut 66. The finger 64 is spring-urged to its retracted and inoperative position upon release of the nut 66, its upper end then contacting an adjustable limit screw 79. The edge guide 59 is mounted on the underside of the foot 20 adjacent the face 55 by a screw 60 permitting adjustment of the guide to and from the finger 64; it is held against twisting by a rib-and-groove engagement with the foot. In operation, a thumb screw 25 at the top of the head 18 sets the lower position of the face 55, Fig. 3, when the handle 22 lowers the guide rod 27 and so determines the depth of cut. The setting of a thumb screw 36 operating against an upwardlyinclined arm 51 of the presser foot adjusts the angle of the face 55 with respect to the knife 12 to determine the length of the bevel to be cut. The rotation of the head 45 of the eccentric pin, using a screw driver, changes both the angular relation of the presser foot with respect to the rod 27 and the position of the edge 62 of the guide 59 with respect to the rear face of the feed roll 16; a pivoted latch 50 holds the eccentric pin 46 in position while permitting this rotation. By suitable adjustments of the above settings it is therefore possible to obtain a wide variety of plain bevelled or partially bevelled skives, such skives being performed with the grooving finger 64 retracted so as to be flush with the face 55 and its upper end urged to its extreme upper position, after release of the thumb nut 66, in contact with the limit screw 79. For both skiving and grooving, the page 64 is caused to project to the desired extent from the face 55. The operation of the finger 64 can be performed mechanically, electrically or pneumatically, instead of manually as shown. In a second embodiment, the presser foot is provided in addition to the edge guide 259 and grooving finger 264, Fig. 11 (not shown), with a second and retractable edge guide 370 for producing shorter bevels without grooves. The guide 370, which is normally held in retracted position by a spring 377, can be pivoted to operative position where it abuts a screw 380 by tensioning a wire 375, the edge 385 of the guide being aligned in this position with the forward face of the finger 264 and so rendering the latter ineffective. In the further modification shown in Fig. 13 (not shown), the edge guide 485 is mounted separately from the foot on a bracket 492 which is swingably mounted on the shaft 409 of the knife 412 and carries, in addition to the guide, the feed roller 415 driven through flexible gearing. The bracket 492 can be swung by an air cylinder 498 to position the guide 485 according to the type of skive required; in its advanced position its front edge aligns with the front of the grooving finger 464 so as to produce a plain bevelled skive, and in its retracted position is disposed adjacent the heel of the foot to form a grooved skive. In the embodiment of Fig. 14 (not shown), a cable 570 is used to overcome the force of a spring 577 and move the guide 570, which is mounted slidably on the presser foot, from a position in which it is in alignment with the side of the grooving finger 564 to an extreme rearward position.