Patent GB-642162-A (GB)
Title: Improvements in or relating to the ornamentation of workpieces
IPC: B28B11/00
Filed: 1947-11-01
Abstract: 642,162. Transferring designs. BRITISH UNITED SHOE MACHINERY CO., Ltd., JAMES, C. H., and PRATT, J. W. Nov. 1, 1947, Nos. 29188/47 and 3472/48. [Class 100 (ii)] In a transfer impressing machine wherein during the operation of the tool relative movement takes place between the work support and the tool, whereby the transfer is operated on over its whole pattern locality by locality, and wherein the work is subjected at each locality to repeated pressing operations by rapid reciprocation of the tool towards and away from the work support, straightening of a toggle device is arranged to cause relative approach between the support and the path of the tool to cause the tool to operate on the work, the pressure between the work and the tool not being passed back substantially to an operator-controlled member such as a treadle by which the toggle device is operated. A member 67, Fig. 1, having a slot 73 is mounted on a shaft 69 and continuously oscillated by an eccentric mechanism from a power-driven shaft 51. The tool 25 and work support 27 are carried on arms 21, 23, pivoted at 17, 19 and reciprocated by a toggle 99, one arm of which is pivoted to an extension 107 of the arm 21 and both arms of which are pivoted at 103 to a lever 81 oscillated from the member 67 through a link 79. The amplitude of oscillation of the lever 81 depends on the position in the slot 73 of a slide block 75 on the link 79, which position is controlled by a treadle on a rod 95 and a spring 97. When the treadle is not pressed, the block 75 is adjacent the shaft 69 and the amplitude is substantially zero. When the block is midway of the slot the reciprocation of the tool and support is a maximum and if the block is at the top the frequency is doubled since the toggle is broken in both directions. Excessive pressure on a workpiece such as a cup blank B is prevented by relative pivoting of the arm 21 and extension 107 against a spring 113. The tool and support comprise facings 35, 43 of sponge rubber, hard rubber, felt, cork, stiff bristles or a combination thereof. A cylindrical tool 127 comprising a stiff-bristled brush or having a work-engaging surface of hard rubber, felt, cork or the like is given a small oscillatory movement from the shaft 69 through lever 119, link 121 and two-armed lever 123, and the bottom of the blank B may be manually held against it. In another form, Fig. 3, the support 211 for a plate blank P comprises an aluminium casting 225 fixed to a shaft 223 and resting in its lower position on a metal disc 229 on a rubber buffer 231 fixed in a table 219. Tensioned round the casting are two endless smooth rubber bands 241, 242 gripping a number of positioning elements E. The blank P rises on the rim of band 241 forming an airtight space acting as a cushion, and on forcing down the rim of the band 241 the latter bends over a rim 235 of the casting, thus giving greater support. A mushroom valve 247, 251 allows leakage of water from below the plate blank. The tool 213, comprising sponge rubber sheets 327 shaped to engage a diametrical strip of the blank, is vertically reciprocated by a power-driven pulley 285 through an eccentric 287 and slide members 293, 299 separated by an adjustable compression spring 301. The tool is supplied with water through pipes 329. The support 211 is raised into operative position adjacent the tool by a treadle actuating a bell-crank 271, 273, pivoted at 275 on a sleeve 221 of the table 219 and actuating, against a spring 278, a toggle lever 263 pivoted to the shaft 223. The support is slowly rotated, to allow the whole blank to be operated on, by power through reduction gearing at 345 and a chain 341. In a third form, Fig. 6, the support 427 and tool 425 are shaped to hold a cup blank T and supplied with liquid through pipes 439, 515. The tool is reciprocated as in the second form. The support is slidable vertically in a slide 445 and is raised by a treadle acting against a spring 537 to straighten a toggle 463, 451, the stud 451 threading into a transverse pin 449 mounted on a slide member 443 of the work support. The eccentric 487 also operates a stiff felt tool 517 for impressing the bottom of the blank T. Specifications 1432/97, [Class 100], 491,273 and 527,173 are referred to.