| 摘要 |
1,144,069. Escapements. TELETYPE CORP. 16 June, 1966 [6 July, 1965], No. 26950/66. Heading F2X. Intermittent drive apparatus comprises an escapement wheel 20, a rotatable arrangement constrained to rotate in only one direction under control of a constant drive torque, a pawl 30 for limiting movement of the wheel 20, and a resilient coupling between the rotatable arrangement and the wheel to urge the latter in the same direction as the rotatable arrangement when released by the pawl 30. The rotatable arrangement consists of a flywheel 22 connected by a spiral spring 34 to a cup-shaped extension 40 of a toothed pulley 41 driven by a toothed belt 43 and a torque-limiting coupling 46 from a motor 45. A torsion rod 14 forms the resilient coupling between the flywheel and the member 20 and a one-way brake 23 prevents reversal of the flywheel when the torsion rod is fully wound. The spring rate of the torsion rod and the mass of the driven member are chosen to decelerate the escapement wheel before engagement with the pawl and to permit flywheel 22 to unwind reverse torque in the rod 14 before it can cause the escapement wheel to rebound. The escapement drives the paper-feeding sprockets 10, 11 of a telegraph printer. |
