Patent GB-190221473-A (GB)
Title: Improvements in Machinery or Apparatus for Perforating Telegraphic Tape suitable for use in the Automatic Transmission of Telegraphic Messages.
Inventor: CREED FREDERICK GEORGE
Filed: 1902-10-02
Granted: 1903-10-01
Abstract: 21,473. Creed, F. G. Oct. 2. Telegraphs. - A keyboard machine operating pneumatically for perforating type for automatic transmitters is modified from that described in Specification No. 25,396, A.D. 1901. Fig. 3 is a longitudinal section of part of the machine. The key-levers b are pivoted at c, and spread out in front of the machine under a base a, which carries the principal supports e, d, 14. A spacing-bar is carried by levers 1 pivoted at 3. The rear support d carries three air cylinders and pistons, not shown. The main air cylinder is placed longitudinally, to operate a link 15, a lever 12, and pressure bars 18, to drive and return the punches 20. Above the main cylinder is a transverse cylinder acting through a long lever (not shown) to reciprocate the tapefeeding pins transversely in the machine. Beside the main cylinder is a longitudinal cylinder, which reciprocates the tape feeding and retaining pins longitudinally in the machine, and also controls the air supply and exhaust of the main and feeding cylinders. The valve supplying the control cylinder is linked to an arm of a shaft t, arms of which, over the spacing-levers 1, carry a transverse bar over all the key-levers b, so that depression of any key or the spacing-bar admits air to the rear of this cylinder ; its piston-rod is connected to an arm of a shaft 8. An arm 10 of this shaft then moves a valve, supplying air to the main and feeding cylinders simultaneously. When the key is allowed to rise, the controlling-piston and other parts return. In the punching-mechanism, depression of any key-lever b raises one of a row of lifting-blades 28, between guides, and this raises a notched selector blade 25. When the pressure bars 18 are moved forwards by the action of the main cylinder, the raised blade 25 only is pushed forwards. The blades 25 bear against differently-placed projections on horizontal selector plates 19, which are arranged in a pile and have front projections bearing against distance-pieces 23, each of which bears against one of the punches 20. The forward movement of one selector blade thus drives corresponding punches. The punches are beaded, and pass through a perforated transverse strip 35, which is connected by rods to the lever 12, so that, when this is moved backward by the main cylinder, the punches and other parts are returned rearwards. The tape passes transversely between two plates 31, arranged so that the perforations made are immediately visible. During punching, the tape is held stationary by a set of pins 52 held forwards by an arm 54, connected to the shaft 8. Fig. 6 is a transverse section showing the pins 52 and punches 20. Another set of pins 37 slides longitudinally in a block 41, which is reciprocated transversely in the machine by the long lever and transverse cylinder, to feed the tape. The pins 37 are moved longitudinally by connection with an upright lever, not shown, linked to an arm of the shaft 8, Fig. 3, so that they are always in engagement with the tape when the pins 52 are withdrawn. For feeding the tape, when the spacing-bar is depressed, or any lifting-blade 28 raised by depression of a key-lever b, a frame 66 is also raised, turning one of several bell-crank levers 65, and placing one of several stops 60 in the path of the transverse slider 41. The movement of the slider 41 toward the punches is thus limited in accordance with the length of the letter being punched ; this movement occurs while the paper is being punched. The feeding- pins 37 afterwards enter the paper, and move outwards with it, until the slider 41 bears against a sorew stop 73.