Patent GB-311680-A (GB)
Title: Improvements in or relating to machines for stretching and conditioning hides, skins, leather and the like
IPC: C14B1/02
Filed: 1928-02-14
Abstract: 311,680. Turner Tanning Machinery Co., Ltd., and Harrison, J. H. Feb. 14, 1928. Boarding, breaking, and staking.-Leather, hides, skins, and the like are stretched by a machine of the type in which the material is forced between adjacent work supports by a blade or equivalent member while being drawn over the supports by a device such as a roller, the machine being also provided with means between the blade and the roller for laterally spreading the material during the stretching action. Two cylindrical work supports 1, 2, Fig. 1, are non-rotatably secured in jaws 3, 4, respectively, by screws 7 engaging the jaws and one of a series of holes in the supports, the screws being removable to permit of independent adjustment of the supports in case of wear. The jaw 3 is fixed in the frame 5 of the machine, but the jaw 4 is adapted to rock. Springs 10, tending to force the jaws apart, are provided. Non-rotatable screws 9 are mounted near the ends of the jaws and carry nuts in the form of worm-wheels 11 actuated bv worms on a common shaft 15. The heads of the screws and the worm-wheels prevent movement of the jaws during the stretching-action when the work is pressed by a blade 18 between the supports 1. 2. Alternatively, the supports may be adjustable by means of screws to the minimum thickness of the work and adapted to yield, for example, under spring control, to accommodate the thicker portions of the work. Set-screws 13 may be provided to prevent tilting of the jaw 4. The support 1 is formed with helical grooves extending outwardly in each direction from the centre, the grooves tending to stretch the work laterally as it is drawn over the support 1 by a draw roller 40 arranged at a slightly lower level than the support. The support 2 may be grooved or plain as desired. 'The work is forced between the supports by a blade 18 or the like which is carried on a beam 19 slidable in guides on the frame of the machine. The guides are connected by rods 25, Fig. 3, to cranks on a shaft 27 driven by gearing from a constantly-driven shaft 29 through the medium of a clutch 28 under the control of a treadle 34, means being provided for disconnecting the clutch automatically after half a revolution of the shaft 27 so that the blade is stopped in raised or lowered position. The roller 40, Fig. 1, is provided with a leather or other apron 43 secured in place by a clamping-plate 44 and is rotated from the shaft 29, Fig. 3, through the medium of chain gearing 48, 49, 50, shaft 47, and gear-wheels 51, 52, the gear-wheel 51 being slidable on the shaft 47. Movement of the wheel 51 to connect or disconnect the roller 40 may be obtained by means of a hand-lever 53, rock-shaft 55, and fork 54; alternatively, the disconnection may be effected automatically, when the beam 19 is raised, through the medium of a cam 56, Fig. 7, rotated by one of the cranks on the shaft 27 controlling the movements of the beam and acting on a lever 61 adapted to rock the shaft 55. The cam stops in a position clear of the lever 61 so as not to interfere with the movement of the wheel 51 by the hand-lever 53. In use, half the work is thrown over the supports 1, 2, the other half is wound upon the roller 40 and the blade 18 lowered to stretch the material, the grooves of the support acting simultaneously to extend the work laterally.