| 摘要 |
<p>1,152,976. Clutches. INTERNATIONAL BUSINESS MACHINES CORP. 5 April, 1967 [26 April, 1966], No. 15515/67. Headings F2C and F2U. To prevent overrunning of a driven shaft 11, after sudden application of a coil spring clutch 30, due to the release of stored energy in a resilient coupling 40 through which the clutch connects the driven and drive-shafts 11, 20 in machines such as electromechanical typewriters, calculators or telegraph transmitters, the shafts 11, 20 are directly connected by a one-way jamming- roller clutch 50 which allows the drive-shaft 20 to overrun the driven shaft 11, but not vice versa, the backlash of the clutch 50 being sufficiently limited to prevent relief of the coupling 40 until the clutch 30 is disengaged. The shaft 20 is continuously driven by an electric motor 21 and carries input member 41 of the resilient coupling, the teeth 43 of which drive teeth 44 of the output member 42 through resilient blocks 45. The output member 42 carries a sleeve 34 adapted to be clutched to an extension 35 of the output shaft 11 by spring 31 on actuating an electromagnet 37 to remove latch 33 from its abutting position on a doublelobe or half-revolution control collar 32 to which one end of the spring is fixed. A followup latch 36 is provided to secure the output shaft in its home position. The one-way clutch comprises rollers 53 between cam surfaces 51, 52 on extensions of the shafts 20 and 11. The coupling 40 may follow the spring clutch.</p> |
