Patent GB-1280501-A (GB)
Title: Apparatus for installing edging in a workpiece
IPC: B27D5/00
Filed: 1969-08-18
Abstract: 1280501 Finishing edges ROYAL INDUSTRIES Inc 18 Aug 1969 [3 March 1969 41141/69 Heading B5K Apparatus for installing edging 174 comprising a tongue 178 within a slot 408 in the peripheral edge of a workpiece 406 comprises a hammer structure 310 comprising a hammer head 312 normally biased to an idle position and drive means 354 for oscillating the head 312 when the head is displaced counter to the bias into responsive relation with the drive means to hammer the tongue 178 of the edging 174 into the slot 408, and a cutting structure comprising (a) means defining a through-bore 172 into which the edging 174 is loosely fitted and from which the edging 174 is discharged adjacent the head 312, (b) a severing blade 232 disposed generally transverse to the edging 174 in the through-bore 172 and (c) actuating means for displacing the blade 232 across the edging to sever the edging at the desired location. A slotting head mechanism 30, Figs. 1, 2 and 3, is mounted on a workbench 22 and, in operation, the peripheral edge of a workpiece is guided past a motor driven cutting blade 56 by maintaining the edge of the workpiece against spacer blocks 48, 50 and/or a bearing 64, through which a shaft 58 carrying the blade 56 extends, until the blade 56 has cut a central groove around the entire periphery of the workpiece. Levers 98, 100, 102 pivoted on a shaft 88 and acted on by springs 120 exert a downward pressure on the workpiece as it is displaced. The levers 98, 100, 102 are pre-set into a desired space relation with the upper surface of a base plate 32 by adjustment of nuts 114. Freely-rotatable spherical balls 130 allow the workpiece to be displaced without undue restraint. A guiding and cutting unit 140 comprises a block 146, Figs. 6, 7 and 9, having members 152, 154, Fig. 6, secured thereto to define a tapered notching channel 166 and a T-shaped channel 172 to accommodate plastics T-edging 174 comprising a tongue 178 and a top 176 perpendicular thereto. A U-shape notching die 180 having a lower cutting edge 182, Fig. 7, is positioned in the channel 166 and is secured to a bar 188. When it is required to cut a notch 179, Fig. 6, in the tongue 178, to accommodate curvilinear disposition of the edging 174 along the workpiece without binding of the tongue in the slot therein, a foot bar (230), Fig. 11 (not shown), is depressed to open an air valve (210) and actuate a pneumatic cylinder 202, Fig. 7, to lower the bar 188 so that the die 180 cuts the notch. A severing blade 232, Fig. 9, having a knife edge 234 is located in a channel 150 in the block 146 and is actuatable by depression of a foot bar (290), Fig. 11 (not shown), which opens an air valve (274) to actuate a one-way pneumatic cylinder 266, Fig. 9, to displace the blade 232 to the dotted line position to completely sever through the edging 174. In another embodiment of the severing blade, Fig. 12, a saw blade 450 is rapidly rotated by a motor 486 through chain-and-sprocket gearing 474, 476, 478, 480, 482 and is mounted on a beam 454 connected to a rod 460 in a block 466 which, upon depression of a foot bar, is moved to the dotted line position so that the blade 450 is displaced across the channel 172 to sever the T-edging 174. The exposed side 186, Fig. 6, of the die 180 is covered with a tapered block 305 having a vertical groove 321 with which a corner portion, e.g. 407, of a workpiece 406 becomes aligned and the die 180 is actuated to form a notch 179. When the T-edging 174 has been disposed around the entire periphery of the workpiece 406, the leading end 409 of the T-edging is disposed adjacent a recess 313 until it abuts a shoulder 319. The blade 232 is actuated to sever the T-edging precisely so that the trailing end will ultimately tightly abut the end 409 with only a hairline joint therebetween. A reciprocable hammer 310, Figs. 1, 14 and 16, comprises an annular head 312 provided with an annular groove 322 adapted to receive a laterally extending flange 327 of each of a pair of discshaped hold-down devices 326 which define the path of the reciprocating movement of the head 312 along a single path normal to a line connecting the two devices 326. In use, the tongue of the leading end of the T-edging 174 is pressed into a cut peripheral groove 408 in the workpiece 406. The workpiece and edging are positioned so that the edging 174 is disposed adjacent the head 312. An operator urges the workpiece 406 against the head 312, as indicated by arrow 399, Fig. 14, until the head 312 is laterally displaced against the tension bias of a spring 374 to place a cam follower 350 on the head with a cam 354. As the cam 354 rapidly rotates, lobes 355 thereon serially strike the follower 350 to serially displace the head 312 to drive the tongue of the T-edging 174 into the groove 408 as the T-edging and the workpiece are displaced along the hammer. The resulting movement of the head 312 is accommodated by ball bearings 384, Fig. 16, disposed in a groove 386. When the workpiece 406 is moved away from the head 312, the spring 374 urges the head 312 against a stop 375 so that the follower 350 is out of contact with the cam 354. In another embodiment of the hammer 410, Figs. 17 and 18, the hammer head 312 is supported by a guide plate 412 and a carriage bar 418 upon ball bearings 440, 442 so that the head 312 is capable of smooth reciprocal movement along a path indicated by arrow 447. Shoulders 425 on plates 422, 424 function as stops for the head 312 when the spring 374 urges the head to its inactive position.