A new or improved machine for severing lengths of endwise moving stock

摘要

627,916. Sawing. BARTON CONDUITS, Ltd., and PRICHARDS, A. July 24, 1947, No. 19937. [Class 145(ii)] A sawing machine for severing endwise moving stock, e.g. metal tube emerging from a tube rolling machine, comprises a carriage reciprocably mounted on a support, a severing tool mounted or the carriage for movement transverse to the stock pneumatic means for reciprocating the carriage and means for moving the tool transversely, the carriage being moved forwardly by pneumatic pressure and completing its return against said pressure so that in its starting position the carriage is under load tending to urge it forwardly; together with a device releasable by the stock for retaining the carriage against forward motion until released by the operation of the said device by the stock, whereupon the carriage is accelerated quickly to the speed of the stock. The carriage 12, sliding on the base 10 and carrying a motor-driven saw 17, is held stationary by a latch 64 which is under load due to air pressure in the cylinder 5. Moving stock 40 actuates a trip device 74 on the receiving table 41 (see Fig. 2 not shown) which via rod 68 releases the latch 64, the carriage 12 thus moving forwardly. The cam B, adjustable in guides 75 on the side of the carriage, then strikes the arm 58 pivoted at 9 to operate an air valve X admitting air to cylinders 50 to close grippers 48 on the stock so synchronising the carriage and tube speeds. A roller 28 riding up the slope 36 of the cam A affixed to the bed 10 raises, through the agency of the arm 27, the leg 21 to tilt the cutter frame about the pivots 22, 23 for severing the stock, the cutter moving back from the stock as roller 28 moves down the slope 37 of the cam. As the cam B clears the arm 58 the valve lever 55 returns to its normal position thereby releasing the grippers 48. During the latter portion of this forward stroke of the carriage the trip lever R strikes the arm 54 of the control valve Y so cutting off the forward air supply to the cylinder 5 and allowing air to pass to the opposite end of the cylinder for the reverse stroke, and thus also giving a cushioning effect for the remainder of the forward stroke. This cushioning effect being overcome the carriage reverses direction, and towards the latter portion of the reverse movement the trip lever F strikes the arm 54 thus once again admitting air to the cylinder 5 for the forward stroke, and again producing a cushioning effect. The latch 64 engages an arm 63 on the carriage at the end of the return stroke, so retaining the carriage in readiness for the next forward stroke and under load due to the cylinder 5 being under full pressure. The cylinder 5 is pivoted to the base at 59, whilst the cam A can be adjusted with respect to the roller 28 and the trip lever F can be moved relative to the trip lever R.