Patent GB-521551-A (GB)
Title: Typewriter for reproduction purposes
IPC: B41B13/00
Filed: 1938-10-20
Abstract: 521,551. Typewriters. KESZLER, E., and BARCZI, B. G. Oct. 20, 1938, No. 30336. [A Specification was laid open to inspection under Sect. 91 of the Acts, April 21, 1939] [Class 100 (iv)]  The platen-roller 1, Fig. 1 or carriage is provided with means for removably securing thereon a bar or rod 3 -having a front surface adapted to be typed upon. In the preparation of a printing- surface, a typewriter having variable letter-spacing mechanism is employed, justified lines are typed on individual bars, the bars are assembled in page form, and a printing-plate is prepared therefrom by photographic or other methods. Letter-spacing mechanism; paper-supports;  keyboards.-The Specification as open to inspection under Sect. 91 comprises also the following subject-matter. To provide for key-controlled variable-spacing, the keys control means for moving the platen-roller relatively to a support controlled by the ordinary letter-spacing mechanism. In the mechanism shown in Fig. 1 (Cancelled), the platen-roller 2 is connected by a spline 4 and friction-springs 3 to a roller 1 mounted in a carriage 60 provided with ordinary letter-spacing mechanism. The platen-roller engages a fork 8 on a rack 9 gearing with a pinion 10 provided with ratchet-wheels 11, 11<SP>1</SP> which have opposite teeth and co-operate with pawls 12, 35 respectively. The pawls 12, preferably six in number, are operated by individual solenoids 13 and are arranged to move the platen-roller towards the left through one to six space-units. Similarly, six pawls 35 are operated by individual solenoids and move the platenroller to the right through one to six space-units. When keys 31 of medium letters are operated, none of the solenoids is energized, and the ordinary letter-spacing mechanism imparts to the carriage and platen-roller a twelve-unit spacing movement. When a key 32 for a narrow letter such as i is depressed and released, a contact 34 is closed twice, the associated solenoid is energized twice, one of the pawls 35 is operated twice, and the platen-roller is moved six units towards the right to correct the feed imparted by the ordinary letter-spacing mechanism. Similarly, when a key 17 for a wide letter such as m is operated, a contact 20 is closed twice one of the pawls 12 moves the platen-roller'six units towards the left to correct the spacing. The solenoids may be provided with plug-connections 23 for enabling the spacing produced by any of the keys to be readily changed. When a type-bar is provided with a medium and a wide type, for instance l, L, a double key is provided, the l-key overlapping the L-key and being provided with a contact for closing the circuit of a solenoid. For variable word-spacing, a series of space-keys providing spaces of from one to sixteen are employed. Some of the spacekeys actuate the space-bar and also energize solenoids, whilst the remainder of the spacekeys energize solenoids but do not actuate the space-bar. The character-keys may be arranged to close their contacts once only, and in this case the types are offset on the type-bars by an amount equal to half the appropriate total space - correction. In an alternative spacing - mechanism, the platen - roller is mounted in a yoke which is movable relatively to the carriage and engages two claws which are caused to grip the yoke on energization of electromagnets. The claws are moved to the left and right by means of solenoids and are arrested by stops of graded thickness which are projected by other solenoids. On depression of a key associated with a narrow or wide type, one of the claws moves the yoke and platen-roller into a position determined by the projected stop to correct the spacing. This subject-matter does not appear in the Specification as accepted.