Patent GB-241780-A (GB)
Title: Improvements in type bar actions for typewriting machines
IPC: B41J7/02
Filed: 1925-02-16
Abstract: 241,780. James, R. W., (Remington-Noiseless Typewriter Corporation). Feb. 16, 1925. Type-lever actions. -Each type-carrier is provide wich two types and is associated with two keys .adapted to move the type - carrier along different paths to select the corresponding type, the type-carrier being decelerated and pressed noiselessly against the platen by motiongoverning means, which may include a momentum accumulator. If platen-snift mechanism is provided the type-carriers may have more than two types. Each typecarrier 3 is provided with two type-heads 4, 5 having different types 6, 7 which are moved to the printing point along paths c, b by depressing keys 41, 42 respectively. The type-heads may also have upper-case types 6<a>, 7a which are rendered effective by shifting the platen 99. The associated pair of keys 41, 42 may be as shown in adjacent banks but are preferably in alternate banks. The type-carrier is mounted on rooking arms 8, 9 pivoted on pins 12, 13, the pin 13 being stationary, and the pin 12 being carried by a bell-crank 14 which is rocked when the key 41 is depressed but remains stationary when the key 42 is depressed. The levers 43. 61 carrying the keys 41, 42 are connected by links 48, 62 to parallel sub-levers 53, 64 respectively, the sub-lever 53 having an arm 55 connected by a link 56 to the bell-crank 14; the arm and link form a toggle, and are normally in alignment. A stop-pin 60 arranged in an aperture 59 limits the movement of the arm. The sub-levers 53, 64 have curved treads 53<a>, 64<a> co-operating with curved treads 84 on a lever 73 which is connected by linkage described below to the type-carrier. The lever 73 has lugs 79 for engaging a. stop consisting of a segmental strip 80 abutting on a pad 81. The links 48. 62 engage pivots on the keylevers and are retained by pivoted spring-clips 50. On depressing the key 42, the pivot 12 remains stationary and the type 7 moves to the printing point. On depressing the key 41, the bell-crank 14 is rocked by the toggle 55, 56, and the pivot 12 is depressed, thereby causing the type 6 to move to the printing point. The parts connected to the key-levers are normally returned by springs 45, but to ensure the toggle 55, 56 being in normal position when the key 42 is operated, the sub-lever 64 is connected by linkage @7, 69 to a rocking arm 72 adapted to depress the arm 55 if it has remained in abnormal position after operation of the key 41. The lever 73 is connected by a link 94 to a lever 91 which is connected by a link 89 to the type-carrier, the link 94 being in the known manner provided with a momentum accumulator or weight 96 normally resting on a pad 97. On depressing either of the key-levers 43, 61, the lever 73 causes the toggle 89, 91 to move the type-carrier, and when the type approaches the printing point, the keylever is arrested and the movement is completed by the weight 96. The type comes into contact with the paper before the toggle is completely straightened, and at that time the upper part of the type is slightly in advance, the effect being that the type effects impression by a rolling or kneading movement. The levers 53, 64, 73, 91 are pivoted on a bracket 17 arranged radially to the printing point and having an arm 28 engaging a radial slot in a frame member 2, and a slot 32 engaging a segmental comb 35 in a frame member 34, a projection 28 on the arm being engaged by an adjusting-screw 31. The pivot 15 of the bell-crank 14 is carried by a support 16 adjustably mounted on the bracket 17 in the following manner :-The bracket has a pin 24 and revoluble eccentrics 18, 22, Fig. 2, engaging inclined slots 25, 21, 23 in the support, the slot 25 and the part of the slot 23 that receives the eccentric 22 being at right-angles to the slot 21. The support is secured bv means of a washer 26 clamped by a screw 27 which passes through the slot 23 and is tapped into the bracket 17. The pivot 13 is carried by an arm 36 which is pivoted at 37 to the bracket 17 and has a longitudinal slot engaging a revoluble eccentric 39. To adjust the types 6, 7, and consequently :he types 6a, 7a with reference to the printing point, the type 6 is brought to the printing point and is adjusted by turning the eccentric 22 or 39 and thereby raising or lowering the links 9, 8; these eccentrics are employed also for tilting the type-carrier to set the types 6, 6<a> in tangency to the platen at the printing point. The type 7 is then brought to the printing-point and is adjusted by turning the eccentric 18 and thereby moving the support in a direction parallel to the slots 23, 25, the movement of the pivot 15 causing the bell-crank to rock and raise or depress the type-carrier. The above-described adjustments of the type 6 are not affected by the adjustment of the type 7, since the parts are so arranged that the movement of the support 16 effected bv the eccentric 18 is at right-angles to the line occupied by the pivots 12, 15, 10 when the type 6 is at the printing point.