| 摘要 |
965,946. Broaching. SUNDSTRAND INTERNATIONAL CORPORATION S.A. March 13, 1962 [Oct. 2, 1961], No. 9685/62. Headings B3B and B3L. A screw or like nicking machine comprises a rotatable wheel 21 for carrying the screws 42 against a broaching blade 90. Screws from a shoot 30 are positioned in the notches 41 of work-holders 40 on the wheel 21 by a notched feed-disc 31 from which the screws are stripped by a spring 68. A bevel-gear 70 on the front of the wheel 21, through a shaft 72, Fig. 10, driving clutch pins 74 pressed by a spring 75 into recesses in the disc 31, drives the disc which may be released by the pins if jamming occurs. This release, by means of a cable 81, Fig. 1, operates a switch 80 which operates an indicator light and stops the machine. For each work-holder 40 there is a slidable member 43 having a sloping surface 44 at one end and roll 52 at the other which follows a cam 50. This, against the influence of springs 46, retracts the members clear of the notches 41 for the loading operation and allows them to advance over the occupied notches. A hammer 60 on a pivot 61 and biased by a spring, has a sloping inpact surface 65 for striking the member 43. If the hammer moves back too far after striking a blow, indicating that the member 43 is incorrectly positioned, its backing plunger 62 operates a switch 66 which operates an indicator light and stops the machine. The radius of the screw-heads is sensed by a pivoted member 55 biased by a spring-loaded plunger 56. If the head is too high, the plunger is raised and operates a switch 58 which stops the motor driving the wheel 21 and operates an indicator light. A blade 90, Fig. 12, at each of the broaching stations 23, 24 is pressed against a seating 101, Fig. 5, by screw-operated pads 109 carried by a member 102 pivoted at one end and having a slot 105 at the other for engaging releasably a post 106. The back 92 of the blade engages a fence 110 pivoted at one end 125 to a slide 111, adjustable by a screw in a channel formed in the base 100, and at the other adjustable about end 125 by an eccentric 126, so that the depth-of-cut per tooth can be adjusted while maintaining the positions of the last tooth to cut. A key on the base 100 guides the slide 111. A deburring tool (not shown) may treat the screw-head before the cam 50 again retracts the member 43, releasing the screw into shoot 32. If the screw remains in the work-holder, its continued presence is detected by a pivoted feeler 86 operating a switch for stopping the motor and operating an indicator light. Drive from the motor to the wheel 21 is by worm-gearing, Fig. 11 (not shown). |
