Patent GB-353125-A (GB)
Title: Improvements in hydraulically operated shaping machines
IPC: B23Q5/26
Filed: 1930-05-09
Abstract: 353,125. Shaping-machines. LANGE, A., 43, Raffineriestrasse, Halle-on-Saale, Germany. May 9, 1930, No. 14361. Convention date, Dec. 31, 1929. [Class 83 (iii).] In a shaping or like machine the ram 5 is driven by a hydraulic pump 6 having an adjustable and reversible delivery and the feed of the table 45 is actuated by further hydraulic mechanism which is actuated intermittently. The ram cylinder 2 is secured to the machine framing and the pistonrods 4, 4<1> of the piston 3 are mounted in the ram. The pump 6, driven by a motor or by a power belt, is connected to the cylinder by pipes 7, 7<1>, and its delivery is controlled by a member 9 actuated through a shaft 10 and lever 11 by a cam 14 which is adjustable in a sliding member 16 which is actuated alternately in opposite directions by means of stops on the ram. The cam member is so shaped that one end portion corresponds to a constant quick return speed of the ram, a central portion causes the pump to run idly while the other end gives the working delivery which, by adjustment of the cam, may be varied from zero to a maximum. Adjustment of the cam is effected by means of a spindle 18 actuated from a hand-wheel through worm gearing 22. In order to move the cam slide at the ends of the ram travel, the ram carries adjustable stops 25<1>, coacting with slides 26, 261, to impart alternate rotary movements to a shaft 27 connected to a slide 30. The pump drives through a shaft 33 and worm 34, a worm 32 having internal teeth 31<1> enclosing a disc 35 carrying a crank pin 24 which actuates the cam slide. The disc carries a double-armed pawl 36 one arm of which coacts with the teeth 311 while the other arm coacts with abutments 301, 30<11> carried by the slide 30 and located at diametrally opposed points in the path of the pawl arm. In Fig. 4, the pawl is held away from the teeth 31 by the abutment 30<1> and the pump control is shown in position for a maximum working feed of the ram. At the end of the stroke the slide 30 is moved to the right through a stop thus releasing the pawl 36 whereupon a spring 37 engages the pawl with the teeth 31 and the crank pin 24 is thereby rotated through 180‹ thus actuating the cam slide to reverse the delivery of the pump. At this point the pawl is disengaged from the teeth by the left-hand abutment 30<11>. At the end of the return movement a second stop 25<1> comes into operation and the crank pin 24 is rotated a further 180‹ to initiate the next working stroke. In order to stop the ram the cam slide may be arrested when the pump control is in the " idling " position. For this purpose a stop lever 40 may be shifted by means of a handle to a position such that it releases the pawl 36 after only 90‹ of rotation. To enable the reversal to be effected by hand, the shaft 27 may be manually operated from a handle 43 through a shaft 42 and bevel gearing 44. The feed of the table 45 is effected by hydraulic gearing mounted in a casing 46 and comprising a pump 47 and motor 48, the pump being driven from the main pump shaft 49 through bevel gearing 50, shaft 51, and worm gearing 52. A valve 53 is positioned between the pump and motor and may be positioned by a handle 58 so that the pump delivers into either of the passages 56, 57 to drive the motor in either direction. A plunger 60 is arranged to provide a variable byepass between the suction and delivery sides of the pump. During the working movement of the ram this plunger is withdrawn to uncover the aperture 59 and the motor therefor remains idle. When the slide 16 is moved for the return of the ram a projection thereon engages a spring bolt which acts through lever mechanism 63, 65, to force the plunger 60 into the aperture 59, the motor being then rotated to effect the feed movement. The extent of the feed is regulated by a screw 66 controlling the plunger 60.