Patent GB-191003406-A (GB)
Title: Improvements in Machines for Perforating Controlling Strips for Typewriters.
Inventor: FAIRWEATHER WALLACE
IPC: B41J3/50
Filed: 1910-02-11
Granted: 1911-01-12
Abstract: 3406. Fairweather, W., [Underwood Typewriter Co.]. Feb. 11. Strip-perforating machines; keyboards. - Relates to keyboard perforating - machines f o r preparing typewritercontrolling sheets. (1) The punches 14 are guided by dieplates 15, 16, and are secured to separate springs 11, which have trip connexions with the key-levers 2. The trips each consist of a finger 9 which is formed with a hook 10 to engage the spring and is also formed with a channel-end, which is pivoted on an arm 4 on the key-lever. When a key is depressed, the spring is tensioned and then tripped, the punch being thereby snapped through the sheet 18. When the key-lever is released it is returned by a spring 20 and a bevelled nose 21 on the trip rides over the spring 11, the trip being finally restored by a spring 22. The punches are each formed with an annular groove which engages a key-hole slot in the spring 11, screws 11<b> being provided for adjusting the tension of each of the springs. The punchings drop into a box 22<a>. (2) The keyboard is arranged and operated in the same manner as that of a typewriter, and contains keys for making the following special-function perforations in the sheet. The carriage-return and line-space perforation is made by a punch 67<a> which is connected to a key-lever, adapted to be operated directly by the key 67 or indirectly by a lever 57 which is pivoted at 58 and is provided with a lug 69 adapted to engage an arm 68 on the key-lever. The lever 57 is arranged as described in Specification 18,917/10 to rewind a spring 31 forming part of the sheet-feeding device. This device comprises feed - rollers 26, 27, which are geared to the spring 31, and are controlled for step-feed by an escapement which is operated from a universal bar 39 carried by levers 40. Normally, at the line end, the lever 57 is depressed, thereby simultaneously making the carriage-return perforation and rewinding the spring 31, the lever 57 thus corresponding in action to the ordinary line-space lever of a type - writer. The carriage - return perforation may be made without rewinding the spring 31, by depressing directly the key 67. The perforation for operating the space-bar of the typewriter is made by a corresponding space-bar 70 which is carried by arms 71 and operates a punch 81. The perforations for effecting carriage shift and release are respectively made by punches 75<a>, 76<a>, the corresponding perforations serving to operate in the typewriter, the locking shift - key, and the release-key, so that all perforation occurring between these, made by the punches 75<a>, 76<a>, cause the writing of capital letters. The punches 75<a>, 76<a> are set slightly in advance of the character and like punches 14, so that the corresponding perforations on the sheet are also set slightly in advance, and thus allow extra time for the operation of shifting and releasing the carriage. This ensures that the carriage shall have had time to reach the intended position before the next letter is printed. The punch 78 is of the same depth as the normal feed of the sheet, so that repeated operations of this key produce a continuous slot, which serves to hold down the tabulator-key of the typewriter for the desired length. The punch 79 makes a perforation which throws out the working sheet and brings into action a second sheet as described in Specification 25,290/08. The punch 81 makes a perforation which effects the arrest of the typewriter. (3) The sheet 18, Fig. 3, is prepared with a series of transverse scales each having the characters in the same order as the punches. The scale is repeated at short intervals so that the operator can read the perforations at any time.