Improvements in or relating to motor mechanism with special reference to switch arrangements for automatic telephone systems

摘要

189,822. Lenaghan, T. June 14, 1921. Selectors of the type wherein one of a number of wiper sets is clutched to a shaft which is subsequently raised, are driven by a motor mechanism comprising blades associated with a rotating shaft and constrained by a cam device to move in a straight path, during which time they may be clutched to the wiper shafts. Each of the blades 29, which are housed in radial slots 28 in two discs 27 on the rotating shaft 26, has a roller 30 engaging in a partly circular, partly straight and vertical cam groove 31 in a plate 32. A tube 47 associated with each vertical series of wiper-sets is free to slide on a guide rod b, and carries at the lower end an arm 21, which upon rotation of the tube engages one of the blades 29. The shaft 26 may be driven through a two-speed gear operated by an electromagnetic clutch 24 controlled by a contact 53 closed by the arm 21 in the clutching position. The guide rod b has two vertical grooves 36, 36a, communicating at the top and bottom by gates, forming a narrow rib d. The tube 47 has an internal pin 37 which is adapted to ascend one groove and descend the other, a collar 20 being acted on by a magnet 19 and a spring 22 to effect proper rotation of the tube. Upon energization of the appropriate magnet 38, a shaft 41 is rotated by means of a pawl and ratchet p bringing one of the stepped trippers 57 thereon into engagement with the latch 42 of the corresponding wiper carriage h, and also clutching the shaft 41 to the tube 47 by the engagement of a star-wheel 40 in a slot 45. Operation of the magnet 19 rotates the tube to bring the arm 21 into engagement with a blade 29. After slight raising of the shaft 41 during which the wipers are tilted into operative position, and the wiper carriage is clutched to the tube 47 by the engagement of a pin 43 in a slot therein, the magnet 38 is again momentarily energized to roiate the star-wheel 40 beyond the slot 45. Upon release of the magnet 19 the tube is locked in position by the forcing of the pin 37 against the rib d, and upon subsequent energization of the magnet, the carriage reaches the top of the bank, whereupon a trigger 46 causes the withdrawal of the pin 43, and the carriage drops to the bottom of the bank.