Patent GB-289916-A (GB)
Title: Improvements in or relating to leather working machines
IPC: C14B1/44
Filed: 1927-01-27
Abstract: 289,916. Turner Tanning Machinery Co., Ltd., and Schettler, G. A. Jan. 27, 1927. Rolling, samming, and squeezing.-A machine specially suitable for ironing, flattening, embossing, smooth plating, &c. comprises a pair of segments which oscillate together in the same direction to operate on the leather, which is placed between them. The segments 1, 2 are pivotally mounted at 19, 20 and may each comprise several sections connected together by bolts. The segments are interconnected at each end by pairs of cables 6, 7, which cross each other on the line connecting the pivot points 19, 20 and are each attached to opposite ends of opposed segments by adjustable anchorages. A suitable anchorage comprises a bracket 13 having an opening which receives a screwed sleeve 11 into which the cable 6 is wedged by a plug 12. The cable is tensioned by a nut 14 rotatable by a tommy bar and abutting against the bracket. The shafts 19, 20 are mounted in self-aligning bearings having hemispherical seatings. A driving means for the machine comprises oppositely running pulleys 30, 31 alternatively clutched by clutches 27, 28 to a shaft 29 which drives, through gearing 32 - - 35, a gear wheel 37 meshing with a segmental rack 38 on the quadrant 2. The driving devices are controlled by means operable from each side of the machine so that a hide may be passed through from one operator to another, and these means are so arranged that when the segments are on one side the machine cannot be started by an operator on the other side. Handles 39, 40 are supported on each side of the machine on arms 41, 42, and 43, 44, Fig. 5, the arms 41, 42 being mounted on shafts 45, 47 carrying levers 46, 48 and the arms 43, 44 turning freely on a shaft 49. The levers 46, 48 are linked to levers 58, 62 mounted to engage a forked member 60 and turn it respectively clockwise or anticlockwise, the movement being conveyed through gearing 63, 64 and a linkage 66 - - 68 to a clutch fork 75 normally held in neutral position between the clutches bv springs. The clutches 27, 28 are accordingly operated by the handles 40, 39 respectively. To ensure a complete stroke of the operative segments a device is provided for locking the clutch lever in the correct position, and this comprises a lever 77, Fig. 4, on the shaft of the arm 66. on which are cam projections 78, 78<a> adapted to be engaged by a bolt 79. This bolt is linked to a lever 82 which extends into the path of two cams 81 mounted on either side of the segment 1. When the segment is in its starting position on either side one of these cams holds the bolt in retracted position and allows the clutch lever to be moved, but as the motion starts the bolt is released and drops behind one or other of the projections 78, 78a and holds the respective clutch in engagement, until on the completion of the stroke the engagement of the second cam with the lever 82 lifts the bolt and releases the lever 77. The cams 81 carry tappets 96. which, by engagement with a, lever 92 operating locking mechanism, including a detent 89, serve to incapacitate the starting device on the side of the machine opposite to that on which the segments 1. 2 are situated. An emergency stopping device is provided comprising fences 99, 100 mounted on arms 101, 102 connected by linkages to levers 111. 112 which engage the lever 82 to withdraw the locking bolt and allow the operative clutch to become inoperative. When either of these devices has been operated the sectors can only be returned to initial position by the operator on the other side of the machine. The machine may be adapted for use on small pieces of work by operation from one side only by putting the detent 79 out of operation and using an auxiliary starting handle 116 or 117 connected to the starting device so as to engage each of the clutches 27, 28 according to its direction of movement. Hydraulic means for applying pressure to the work comprises rams 122 at each end of the shaft 19, the bearings 21 of which are carried by means 119 supported on rods 121 slidable in the machine frame. Oil is admitted through pipes 131, 132 to the ram cylinders 123 by valve-controlled apparatus of the kind described in Specification 290,104, [Class 135, Valves &c.], the control valve of which is actuated by handles 128 on a rockshaft 126 extending across the machine. In order to prevent pinching of the work at the beginning and end of a stroke, the hydraulic pressure is relieved at those times by the actuation of the valve rock-shaft by cams 138, Fig. 8, on the projections 81 which engage a lever 139 on the rockshaft. Means is provided for vertically adjusting the position of the segment 1 relatively to the segment 2 comprising worm gearing 140, 141 operated by a hand-wheel 143. Channels 148 are provided in one or both segments to which steam or hot water can be supplied through articulated pipes 149, 150.