Patent GB-1193498-A (GB)
Title: Improvements in or relating to Typewriters
IPC: B41J3/36
Filed: 1967-09-07
Abstract: 1,193,498. Typewriters. WILLY FEILER Z€HL-UND RECHENWERKE G.m.b.H. 7 Sept., 1967, No. 40863/67. Heading B6F. Power operated type lever machines; framework.-A low-profile power-operated typewriter comprises a keyboard mounted on a subframe 3, 43, 44 releasably secured to a main frame 67, Fig. 7, a continuously driven snatch roll 9 supported by the main frame and located below and rearwardly of the keyboard, and a type lever segment (21), Fig. 1 (not shown), inclined rearwardly at an angle of substantially 45 degrees. Flanges 3a formed on the subframe rest on the main frame 67, slots (3b), Fig. 8 (not shown), formed in the flanges receiving hooks 67a on the main frame so that folding strips 68 can be pushed beneath the hooks to secure the subframe to the main frame. The strips 68 are held in place by detents 68a on the underside of the strips engaging holes 3c in the flanges. Key-levers; power operation; prevention of repeat action.-Keys 4-7 are each secured to a key-lever 39 which in the case of lower keys 4, 5 is pivoted at 42 and guided in a comb 43, and in the case of upper keys 6, 7 is pivoted at 41 and guided in a comb 44, in order to provide substantially uniform key dip. Each key-lever 39 includes a projection 40 which engages a corresponding carrier lever 22 pivoted at 23 and carrying a trip element 25 at its free end. The trip element 25 is formed with a slot 25b which receives a pin 22b fixed to the lever 22, and a triangular cut-out 25c which receives a pin 22c fixed to a depending projection of the lever 22. A spring 36 fixed to hooks (25d, 22d), Figs. 3a, 4a (not shown), formed on the element 25 and the projection of the lever 22 respectively, biases the element 25 counterclockwise and downwardly. On depression of a key the corresponding lever 22 is depressed and a notch 37 on the element 25 engages a hook 38 to hold the element 25 against the action of the spring 36. The pin 22c forces the element 25 out of engagement with the hook 38 to strike a projection 26a of a pawl 26 firmly, the pawl thereby being rotated into contact with the snatch roll 9. The pawl strikes a stop screw 35 to transmit rotational force to a sublever 28 and thereby actuate a type bar 8. On return of the type bar and sublever, the projection 26a engages the side of the trip element 25 to prevent repeat action. Repeated actuation; multiple-action keys.- Further depression of selected keys, e.g. underscore, period and "x" for cancellation, against a spring 47, brings a repeat trip element 51 into engagement with a pin 26c of a returning pawl. The pin 26c strikes a tapered edge of the trip element 51 which thereby acts to return the pawl into engagement with the snatch roll 9. Impact adjustment.-The period of operative engagement between a pawl and the corresponding stop screw 35 may be adjusted by adjustment of the stop screw to effect letter-byletter impact adjustment. Collective adjustment, e.g. for carbon copying, is effected by moving a mounting bar 60 for the screws by means of a wheel (65), Figs. 5, 6 (not shown), in which is formed a spiral slot (65a) which is followed by a pin (64a) attached to a pivotable lever (64) which acts through bifurcated levers (63) and pins (60c) to move the bar 60. Case shift mechanism.-A case shift key 76, Fig. 9, operates through a key lever to depress a carrier lever 75 carrying a trip element 25 to bring a shift pawl 70 into engagement with the snatch roll 9. The shift pawl 70 is provided with a plurality of teeth. The pawl 70 acts on a sublever 71 to rotate a link 72 about a pivot 72b through camming action between a pin fixed to the link 72 and a slot in the sublever 71. The link 72 acts with toggle action together with a further link 73 to rotate an arm 74 about a fixed pivot and displace the platen carriage 18 upwardly through an arm 80a. A ball race (Fig. 10, not shown) aids movement of the carriage. The carriage is held in a raised position as long as the key 76 is depressed by engagement of a tooth 71a on the sublever 71 with a catch 78 resiliently connected to a lever 77 rocked by a tail 75a of the shift carrier lever 75. Sound - deadening arrangements.-The motor (10), Figs. 1, 2, 11, 12 (not shown), driving the snatch roll 9 is mounted in a resilient mounting comprising upstanding rectangular frames (90) holding rectangular rubber or like resilient material blocks (94) having rectangular apertures receiving bearing blocks (93) for the motor shaft (92). A flange 94a of resilient material lies between each frame and the motor casing.