Patent GB-290918-A (GB)
Title: Case shift apparatus for typewriting machines
IPC: B41J11/14
Filed: 1927-11-29
Abstract: 290,918. Rheinische Metallwaarenund Maschinenfabrik S÷mmerda Akt.-Ges., and Goldenberg, B. Z. Nov. 29, 1927. Platen and carriage shift mechanism; shiftkey actions. - In machines equipped with a platen or carriage having two or more shift positions, the shift mechanism, comprises two or more key-operated members or slides which are movable relatively through a distance equal to twice that between two banks of types, and are arranged to transmit their aggregate movement. The mechanism shown diagrammatically in Fig. 1 is adapted for use in a machine having four banks of types, the carriage bed 19 being supported by a slide 2 mounted in guides 7, 8 on a slide 1 movable in stationary guides 3, 4. Stops 5. 6 co-operating with the guide 3 permit the slide 1 to move through a distance a, which is equal to that between two banks of types, whilst stops 9, 10 co-operating with the guide 7 permit the slide to move through a distance 2<a> relatively to the slide 1. The slides 1. 2 are connected to levers 13, 14 provided with shift-keys 11, 12, and a third shift-key 23 is carried by a lever 24 which is pivoted at 22 to the lever 14 and is connected by a link 25 to a pivoted hook 18 co-operating with a lug 17 on the slide 1. The hook is normally disengaged by a spring 26. On depressing the shift-key 11, both slides are raised through the distance a and the carriage receives singleshift movement. On depressing the shift-key 23, the hook is caused to lock the slide 1 and the slide 2 is raised through the distance 2<a>, the carriage receiving double-shift movement. On depressing the shift-key 12, the slide 2 is moved through the distance 2<a> relatively to the slide 1, and the slide 1 is moved through the distance a, the carriage receiving treble-shift movement. Shift-mechanism embodying the above-described arrangements is constructed in the manner shown in Fig. 5, the slide 1 being guided vertically by means of levers 13, 13' and being provided with a lug 3 co-operating with stops 5, 6. The slide 2 has slots 9, 10 engaging studs 7, 8 on the slide 1, and is connected to a lever 14. The shift-key 11 is secured to the lever 13, and the shift-keys 12, 23 are formed on the head of a lever which is pivoted at 22 to the lever 14 and is connected by a link 25 to a hook 18 adapted to engage a recess 17 in the slide 1. The mechanism can be adapted for use in a machine having six banks of types by providing a third slide which is operated by a key-lever and can move relatively to the slide 2 through a distance 2<a>. On depressing the key-lever the carriage is shifted into the fifth or sixth position according as to whether the slide 1 is locked or released by the hook 18. When applied to machines having five banks of types, the third slide is arranged to move relatively to the slide 2 through a distance a. Key-locks.-A finger-lever 33. Fig. 5, for locking the carriage in any of its three shift positions is provided with a pin 31 adapted to engage recesses 29, 30, 31 in the shift-key levers 13, 14. Ink-ribbon mechanism.-In machines equipped with the above-described multiple-shift mechanism, the ink ribbon is compensated for shift by mounting the spools 35, Fig. 6, on the shiftable carriage-bed 19, and the vibrator 36 also is mounted on the carriage bed and is operated from the universal bar 38 by means comprising an arm engaging a slot 44 in a link 37, the slot being of sufficient length to maintain engagement in all the shift positions.