公开(公告)号：US1895108A

公开(公告)日：1933-01-24

申请号：US49950430

申请日：1930-12-02

申请人： CREED & CO LTD

发明人： DENNIS SALMON REGINALD ,  ELLIS KIRK STANLEY

IPC分类号： H04L17/04

CPC分类号： H04L17/04

公开(公告)号：US1882954A

公开(公告)日：1932-10-18

申请号：US55357631

申请日：1931-07-28

申请人： CREED & CO LTD

发明人： DENNIS SALMON REGINALD ,  ELLIS KIRK STANLEY

IPC分类号： H04L12/12

CPC分类号： H04L12/12 ,  Y02D50/40

摘要： 380,126. Actuation of switches. CREED & CO., Ltd., SALMON, R. D., and KIRK, 'S. E., Telegraph House, Croydon. June 11, 1931, No. 16983. [Class 38 (v).] Relates to switches of the kind described in Specification 284,740, [Class 38 (v), Electric switches &c.], for disconnecting a printer motor when signalling has ceased for a predetermined period, and restarting it when signalling begins again. According to the invention the switch is forced open by the inertia of a moving mass, a snap-action spring is provided, the interval elapsing before operation of the switch is made uniform, and the switch sends a clearing-signal to line. The disc 1 is rotated slowly counterclockwise by the printer motor 9 and when current flows in the line L the arm 2 is drawn axially towards the disc so that pin 3 engages in one of the holes 4. The arm thereafter rotates counterclockwise unless a spacing signal detaches it from the wheel, when it falls back to its original position. If, however, no signals occur before the arm reaches its topmost position, switch S is operated to stop the motor 9. The axial movement of arm 2 in response to signals is preferably' effected by cam action as described in the prior Specification. The arm 2 as it rises moves a spring-controlled guard 20 to the right about pivot 21, and when the arm falls in response to a signal this guard moves so as to cover the holes 4 and to prevent premature re-engagement. The number of the holes 4 is great enough to ensure uniformity of the time interval determined by the device. When a signal is received after a period of rest, the arm 2 falls and the momentum of the weight 17 ensures operation of the switch S. A horizontally moving spring-urged mass may be substituted for the mass 17. The arm 12 operates through a spring 16 which produces a snap action. A short interruption of the line L is effected by the switch S as the mass 17 reaches its topmost position. Arm 13 first breaks the line at 28, but when the threearmed lever 11, 12, 13 has moved a little further the blade 30 snaps upwards (owing to the action of spring 16) and closes the line again at 29.