Patent GB-691354-A (GB)
Title: Improvements in or relating to the ornamentation of blanks in the manufacture of ceramic ware
IPC: B28B11/00
Filed: 1949-09-01
Abstract: 691,354. Transferring designs. BRITISH UNITED SHOE MACHINERY CO., Ltd., and BARKER, W. A. Aug. 31, 1950 [Sept. 1, 1949], No. 22664/49. Class 100(ii) In a machine for impressing paint from a transfer, comprising a backing sheet carrying the desired pattern on one side, upon a blank in the manufacture of ceramic ware, and characterized by a membrane forming a wall of a chamber, a support for a blank, means whereby relative movement of approach may be caused to take place in the operation of the machine between the membrane and support to place them in juxtaposition and confine the blank therebetween, and means for causing said membrane to be acted upon by fluids under pressure in said.chamber whereby the transfer and blank are pressed together between the membrane and support, there is provided regulator means which automatically determine the duration for which said membrane is acted upon by the fluid under pressure. The drawings show an apparatus very similar in broad outline to that of Specification 667,265, but comprising two complete assemblies arranged side by side and operable in turn. In the operation of the machine the motor is started and causes rotation of shaft 335 and eccentric 339 thus moving: lever 345 bifurcated into two parts 347, 349, 347 being pivoted on hub 351 (Figs. 8 and 11) and 349 on shaft 353 and the two lying one at the front and one at the back of toothed ratchet wheel 355 splined to shaft 353 and being fixed together at pivot 343 and by stud 357 on which is pivoted driving pawl 361 with tooth 363, and causing pawl 361 to swing to and fro since it is held out of engagement with ratchet wheel 355 by face plate 371 engaged beneath roll 373 carried by tail 375 of the pawl 361. The motor also rotates shaft 129 (Fig. 16), but since dog 133 is held forward by projection 135 on lever 137 the clutch 59 is not tripped and hence shaft 129 rotates idly. A workpiece carrying the transfer which has been applied thereto by hand is now placed on the membrane and, if desired, a treadle is depressed, this forces in a valve member and admits water to pipe 67 (Fig. 19, not shown) and hence along pipe 693 (Fig. 3) and to pipe 717 where it is sprayed out upon membrane 25 through a number of small holes spaced along this pipe. After spraying, handles 61 (Fig. 1, not shown) and 63 are pulled out thus moving lever 179, 181 into a forward position in engagement with stop screws 189, 191 so that pawl 207 pushes a block forward against a spring thus causing rod 241 to be pulled out and lever 247 to be swung clockwise (Fig. 16) as is also collar 275 so that stop screw 281 thrusts down arm 139 to swing lever 137, 139 anticlockwise and trip clutch 59. Both handles 61 and 63 have to be pulled out before arm 185 is moved forward into its forward position and the clutch tripped. Tripping of the clutch rotates shaft 129 and hence, through gearing, shaft 119 which through eccentric 115 and pin 117 forces bar 89 against element 41 slowly lowering this on to element 15. Rotation of shaft 119 (Fig. 16) causes a dog 293 to engage plate 295 and rock lever 297, 299 clockwise against spring 303 causing rod 307 to be pulled back thus forcing down valve stem 321 (Fig. 20, not shown) putting the space between the membranes into communication with a tank maintained at subatmospheric pressure. The plate 371 (referred to above) is held beneath roll 373 by the action of a swelling 421 on cam 385 which acts on lever 377, 379 (Fig. 13)-while this is happening roll 425 is not acted upon by the swelling 421 and hence block 431 lies beneath tooth 433 on ratchet plate 435 thus preventing gear 437 moving anticlockwise, and pawl 439 engages one of the teeth 433 so preventing clockwise movement. However, as shaft 119 rotates (and element 41 is lowered) cam 385 moves so that swelling 421 is disengaged from roll 383 allowing pawl 361 to engage and rotate wheel 355 and shaft 353, the stop block 431 being forced forwards by swelling 421. Rotation of shaft 353 takes dials 55 and 57 therewith. As dial 57 rotates cam roll 445 attached thereto operates lever 447, 449 and via links 505, 509, 513 and 515 moves arm 521 down on to valve stem 525 so opening valve 451 and allowing air under pressure from pipe 529 via pipe 531 (Fig. 3), valve chest 533 and a side passage to chamber 30 and hence via a further side passage, nozzle and passage to chamber 51. The rotation of dial 55 following dial 57 brings cam 453 into position to act on arm 449 and hence close valve 451. The time between the instant at which space between the two membranes is connected to the subatmospheric tank and that at which air under pressure is admitted to chambers 30 and 51 depends on the setting of dial 57 with relation to shaft 353; this is done by the meshing of teeth on its sleeve portion 461 with those on extension piece 477 fixed to shaft 353 but dial 57 may be pressed in against the action of spring 467 to disengage the teeth, turned and then re-engaged in a different position. A similar arrangement governs the relative settings of dials 55 and 57 which determines the length of time during which air under pressure is admitted to the chambers 30 and 51. These settings are altered according to the requirements of any particular run.