Patent GB-292652-A (GB)
Title: Improvements in or relating to tape-applying or like machines
IPC: A43D43/06
Filed: 1927-03-14
Abstract: 292,652. British United Shoe Machinery Co., Ltd., and Roberts, W. T. B. March 14, 1927. Affixing by adhesives.- A machine for applying adhesive tape to sheet material by means of pressure, as described for example in Specifications 220,502 and 272,183, comprises, inter alia, a heated tape-pressing hammer having a yielding, straight-line, operative movement towards an adjustable table, members for feeding and guiding the tape and applying it to the work in advance of the hammer, a cutter for the tape, and means for drawing the tape taut and clamping it before it is cut. As shown, the machine comprises a base 1, Fig. 1, having at one end bearings for a worksupport post 81 and at the other end a column 3 carrying an overhung bracket 5 having at its end a head 6 for the operating instrumentalities. Mounted in the bracket 5 is a driving shaft 7 having at its right-hand end a hand-wheel 9 and a clutch member 11 for co-operation with a pulley 13 on a sleeve 17 adapted to rotate and slide axially on the shalt 7. The pulley 13 is urged by springs 19 and a collar 21 into clutching position, but is normally held declutched by the engagement with a collar 23 of a roll 37 on a spring-held multi-armed lever 31. The latter is moved, to allow clutching movement of the sleeve 17, by a treadle rod 41 and clutch treadle. A stop 49 engaging the lever 31 and controlled by a cam face on the disc 23 prevents declutching until the machine instrumentalities are in a predetermined position in their cycle. An adjustable brake-block 57 is applied through suitable connections when the disc 23 moves to declutching position. The work-support post 81, Fig. 2, is held downwardly by its own weight, and moved upwardly by a treadle rod, a cam-lever 91, and a roll 87 to an extent controlled by a thumb-screw 99, a very strong spring 95 yielding when the upward limit is reached. A work-support carried by the post 81 comprises a rearwardly-convex fixed anvil 101 and a rocking support 103 adapted to rock against a spring 107 for work-feeding purposes and located beneath a work feed foot 141. The parts 101 and 103 may be covered with rubber. In use, the foot 141 presses the work against the part 103, makes its feeding stroke, carrying the part 103 with it, and then rises, the part 103 sliding back beneath the work. An edge guide 109 is mounted adjacent the work-support so that it can be turned out of the way. The hammer 121, Fig. 4, which encloses an electric heating element and has a hammer foot 125, is connected to the head by pairs of parallel links 127, 129 ensuring a straightline reciprocation. The hammer is urged downwardly by a pin 138 and adjustable spring, reciprocation being effected through a contact stud 133 and a hammer actuating cam, not shown. The work feed foot 141, which comprises a feed dog 143 acting on the work at one side of the tape, is mounted on a plunger 145 which is slidable in a casing 147 pivoted at 149 to the head 6 and is reciprocated vertically by a cam 142, and laterally, for feeding the work, by a cam 144. A tape feed foot 161 is mounted slidingly in the foot 141 and is held downwardly by a spring 165. A tapeguiding tube 171 with its rear end adjacent the foot 161 is mounted in a carrier 175 pivoted in a slot in a bracket 181, Fig. 2, on the head 6. A tape-cutting knife 191 carried between the hammer 121 and feed foot 161 by a bent lever 193 is so controlled by a spring-held plunger 195, Fig. 1, that when the latter is depressed the knife is moved across the tape from edge to edge after first being lowered towards the tape. The plunger 195 is so controlled through a lever 203 and a camlever 211 linked to the work-support treadle that the cutting stroke is effected just before the worksupport is lowered. Before it is cut, the tape is held taut by the hammer 121 on one side of the knife 191 and the tape tube 171 on the other. To this end, the tape tube is rocked upwardly, to press the tape against the feed foot 161, by the lever 31, as the machine is declutched, acting through a rock-shaft 221, Fig. 1, arm 229, and U- shaped member 231, Fig. 4. At the same time, the tape is clamped against a ledge on the bracket 181 by an arm 241 on the shaft 221. The tape passes from a roll above the machine through a slot in the bracket 181, over a guide roll, through the tube 171, under the foot 161, and finally under the hammer. At the commencement of a taping operation, the tube 171 acts to present the end of the tape to the work. In a modified feed foot, the work feed dog is mounted on the tape feed foot and may be turned into inoperative position. For taping the skived edge of a piece of work, the work support is provided with a tapered raised part adapted to underlie the skived edge. An alternative tape-severing mechanism comprises a rotary disc cutter 327 mounted on a bracket 335, Fig. 9, in association with a tape guide or presenter 336 pivoted at 337. The tape 300 is led through a yoke 341 on the presenter and over adjustable tension pins 343, 344. The presenter is normally held in the angular position shown in Fig. 9, but is swung outwardly, to tauten the tape for cutting, by means of a cam and a lever 363 connected to a presenter-treadle rod 365. The cutter 327 on a pivoted arm 369 is rotated through pulleys 367, 383, shaft 389, and spiral gear 391, 393, and is swung to operative position, when the presenter 336 is swung outwardly, through rack gearing and a rock shaft. The separate presenter treadle enables the cutting to be effected without stopping the work feed and other operations. One of the Provisional Specifications describes also a, modified form of worktable wherein the part 103 has a finger overlying the part 101, which is reduced, and the whole table oscillates, and another modification wherein a rubber-covered, endless steel band passes over the work support and around a tensioning roll, and is adapted to slide over the support with the work.