Patent GB-600808-A (GB)
Title: Improvements in or relating to trip mechanisms for metal working machines
IPC: B21J9/06
Filed: 1944-07-11
Abstract: 600,808. Forging machines. WILCOX, R. L., and WATERBURY FARREL FOUNDRY & MACHINE CO. July 11, 1944, No. 13244. [Class 83 (iv)] A trip mechanism for automatically disengaging and stopping operating parts of metal upsetting and like machines such as feed and transfer mechanisms embodied therein, comprises a breaker plate forming part of the coupling between a driving means and the ejector mechanism of the machine and adapted to be fractured under abnormal pressure to energize normally inoperative means including a movably mounted stop member or members for automatically and positively stopping the feed and or transfer mechanism independently of the driving means. The invention is described as applied to a machine for upsetting wire stock in a die 123 and the fracture of the breaker plate 23 in the coupling between a cam 12 and the ejector pin 109 serves to stop not only the ejector but also the stock-feeding mechanism and the transfer mechanism operating between the cutting-off station and the upsetting station. The cam 12 operates a rocking lever 14 to which a slide 18 is adjustably connected by means of a pin 19 in one of a series of holes 27-30. The slide 18 projects within a body 20 and is normally rigidly connected thereto by means of a pressure screw 22 engaging the breaker plate 23 and by means of a latch 33. A pin 21 connects the body 20 to a slide 16, axial movement of which operates the ejector pin 109 through a pressure pin 110 and a lever 108. Should the pin 109 fail to eject the . work, the plate 23 will fracture and the slide 18 will move further into the body 20, thus raising the latch 33 and rocking a lever 34 which is connected by a rod 38 with a rocking lever 37, 39. The rocking of this lever operates through a lever 40, rod 48 and arm 46 to rock a shaft 45. This effects the stopping of two other operating parts of the machine. A latch 54 mounted on the shaft 45 is moved to release a plunger 52' which is moved by a spring 53 into the path of a lever 60 connected with the transfer mechanism and a rock arm 91 on the shaft 45 operates through a rod 88, rock lever 87, rod 86 and latch lever 81 to release a spring plunger 82 which operates through levers 77 and 75 to disengage the clutch operating the feed rolls 73. The transfer fingers are carried by a swinging plate 57 adapted to be rocked by levers mounted on a shaft 62 which is coupled by an adjustable connection 63 to the rocking lever 60 which carries a roll 64 in contact with the transfer cam 65 on a shaft 59. Another cam 58 on the shaft 59 operates through a rock lever 95, adjustable connection 101, 102 and rock lever 105, a gagger plate 92 which is thus reciprocated at each revolution of the shaft 59 to move a finger 94 into the path of movement of the clutch operating lever 77. When a complete feed of stock has been made, the finger 94 is in the position shown in Fig. 1 and the clutch may be operated by the hand lever 78 or, in the event of a breakdown, by the plunger 82. At this time the lever 60 is in its rearmost position away from the plunger 52 and the workpiece and transfer fingers are out of the path of the punches 116 and the slide 18 is moving forwardly to operate the ejector pin and a fracture of the plate 23 will prevent further operation of the feed and transfer mechanisms and keep'the transfer fingers out of the path of the punch. If the feed has been interrupted by operation of the hand lever 78, it may be resumed only when the gagger plate is in its rear position. This ensures correct timing of the feed.