Improvements in Automatic Hack Sawing Machines.

摘要

17.372. Herbert, E. G., and Fletcher, C. July 29. Reciprocating-saw machines. - Relates to automatic hack sawing machines of the type in which successive cuts are made automatically through metal bars, tubes, &c., and comprises (1) regulating-mechanism whereby the machine, or the repeat mechanism only, is thrown out of action automatically after a single or any predetermined number of cuts; (2) improved repeat mechanism; (3) means for automatically locking the movable vice jaw against handadjustment while open; (4) a work feed; (5) a rising and falling work-support; and (6) means for stopping the machine when the whole of the work is cut up, or on breakage of the saw blade. (1) The various parts of the machine are operated by the repeat mechanism from a shaft 1 which is driven from a main shaft 3 through clutch members 39, 36 and chain and worm gear 38, 35, 33, 32. The movable clutch member 36 is controlled by the regulating- mechanism, which comprises a lever 40 pivoted to the saw-frame guide 41 and furnished at its lower end with a projection 40a, Fig. 5, adapted to engage the tail 47a of a spring catch lever 47 normally engaging with a lug 42b on a lever 42 connected to the clutch member 36; a spring 42a connected to the lever 42 normally tends to close the clutch, but after each complete cycle of operations a pendent lever 46 is deflected by a cam 49 on the shaft 1, and, swinging back under the influence of gravity and a spring 46c, rocks the lever 42 through projections 46a, 42a until the lug 42b passes under the catch lever 47. Co-operating with the lever 40 is a setting-device comprising a disk 57, Figs. 1 and 4, furnished with a stop 57a adapted to come into the path of a projection 40c on the lever and swing the lever aside so that the projection 40a misses the catch lever 47. The disk 57 is furnished with a graduated dial 1, 2, 3, ... which can be set relatively to a fixed pointer 58a. Upon each descent of the lever 40, the disk is partly rotated through a projection 40b lever 59, pawl 60, and ratchet 58. After the predetermined number of operations. the stop 57a engages with the projection 40c and throws the repeat mechanism out of operation. In addition, the machine may he stopped by a projection 40d on the lever 40 engaging with and releasing a locking-lever 54, which holds the belt-shifter 51a, 51 against the action of a spring 51c, Fig. 5. The ratchet 58 is formed with a blind tooth corresponding to the indication R on the disk, whereby the disk can be set so that the ratchet is not rotated and an indefinite repeat is obtained. (2) The shaft 1, Fig. 1, is furnished, in addition to the cam 49, with a cam 6 adapted to raise the saw-frame guide 41 through a lever 8 and link 9, and to operate the feed stop 11, and with a face cam 13 acting upon a lever 14 for closing the movable vice jaw 17. (3) Rotation of the vice adjusting-screw 16 is prevented, when the vice is opened, by a pin 14a on the shorter arm of the lever 14 engaging recesses in a disk 19 mounted upon the screw. (4) A spur-wheel 12 on the shaft 1 drives a feed roller 20, Fig. 2, arranged beneath the work, through a pinion 21 and friction plate 22 influenced by a spring 23. The work is supported upon rollers 20a mounted in brackets 25 some of which are adjustably mounted upon standards. Motion is imparted to the rollers 20a from the roller 20 through chain gearing 28. (5) A worksupport 78, Fig. 1, which is pivoted at 79 to the lever 14, is lowered during feeding and is raised to support the work, during cutting, by a cam 12a and levers 82, 80. (6) A roller 61, Figs. 2 and 4, resting upon the work above the roller 20 is carried by a lever 62 carrying a notched bar 63 under the influence of a spring 64. When the whole of the work is cut up, the roller 61 drops and the bar 63 rocks a bellcrank lever 69 and moves a rod 65 carrying a shoe 67 embracing the lever 40, deflecting the lever and throwing the repeat mechanism out of operation. (7) A spring finger 70, Fig. 1c, normally held by the saw clamping-nut 73, is released upon breakage of the saw, and under the influence of the spring 72 swings into position to engage a lever 74 mounted upon a shaft 75, Fig. 5, fitted with a weighted lever 76, Fig. 4, which acts upon a bar 77 carried by the rod 65.