Patent GB-311515-A (GB)
Title: Improvements in slicing machines
IPC: B26D1/14
Filed: 1928-03-30
Abstract: 311,515. Fitzpatrick, H. D., (Maatschappij tot Vervaardiging van Snijmachines Volgens van Berkel's Patent en van Andere Werktuigen). March 30, 1928. Cutting slices in succession.-In a slicing- machine the working parts, or any of them, are operated by pressure fluid, i.e., hydraulically or pneumatically. The invention is applicable to slicing machines wherein the knife axis is stationary and the knife is reciprocated or oscillated bodily. As shown in Figs. 1, 2, the invention is applied to a disc knife reciprocating table machine. The knife 3 is rotated by a pressure fluid motor 15 on its shaft, the table is reciprocated by a plunger 33 which slides in a hydraulic cylinder 24, and the meat clamp is actuated by a plunger 39 which slides in a hydraulic cylinder 40. An electric motor 10 drives a centrifugal pump 9 having two discharge pipes, one pipe 12 leading to the knife driving motor 15 and the other 13 leading to a valve chest 18 and an adjustable leak valve 16a, which may be an ordinary safety valve. The pipe 26 leads the waste fluid from the motor 15 to the main reservoir 8 in which the pump 9 has its suction. The valve chest 18 contains a sliding valve 17 operated by a lever 27 pivoted at 28 to the base 1 and having its end disposed between stops 31, 32 on the meat table, the stop 32 being adjustable to permit the stroke of the table to be varied. As shown in Fig. 2, the valve 17 is positioned to permit fluid from the pump to pass through ports 19, 20 and pipe 20<a> to the cylinder 24. Exhaust fluid passes through the pipe 21a, ports 21, 23 to the tank 8. At the end of the stroke, the stop 31 moves the valve 17 and fluid passes from the pump through ports 19, 21 and pipe 21a to the other end of the cylinder 24, and exhaust fluid returns to the tank 8 through the pipe 20a and ports 20, 22. The plunger 33 is mounted on a rod 34 secured to a pin 35 depending from the reciprocating table. The press 40 for the meat clamp is supplied with fluid from a pipe 44 and a hand actuated valve 43, the exhaust fluid passing to the tank through a pipe 45. The pipes 43, 45 are connected to the pump and tank by flexible pipes. The clamp is slidable on a post 36 and has an arm 37 connected to the rod 38 of the plunger 39. By regulating the leakage past the valve 16<a>, the speed of the machine may be varied. An additional valve may be provided in the pipe 21<a> to obstruct the passage of fluid to the cylinder 24, thus making the cutting stroke slower than the return. Leak valves may be provided at the end of the chest 18 to permit the valve 17 to work freely and to assist in retarding the. carriage as it nears the ends of its stroke. The carriage may be operated by fluid pressure, whilst the knife is rotated by a mechanical connection with the carriage. When the town main water pressure is adequate, the reversing valve 17 may be connected directly thereto. With a slicing machine having a rotary carriage, the rotation may be effected by a motor similar to the motor 15, or a piston and cylinder press may be used and coupled to the carriage by a crank and connecting rod. According to the Provisional Specification, the machine is controlled by a hand or foot member coupled to a control valve.