公开(公告)号：SE344434B

公开(公告)日：1972-04-17

申请号：SE1744268

申请日：1968-12-19

Applicant: IBM

Inventor： OKCUOGLU S ,  WALKER G

IPC: B41J29/50 ,  B41J21/02

Abstract: 1,212,928. Typewriters. INTERNATIONAL BUSINESS MACHINES CORP. 2 Dec., 1968 [9 Jan., 1968], No. 57057/68. Heading B6F. In a typewriter in which the letter-spacing may be either one of two different pitches the margin stop mechanism is coupled to the escapement rack so that the stops may be set accordingly. As shown a spherical type-head 12 is mounted for relative movement to a platen 11 and is mounted on a carrier 13 having an escapement pawl 17 co-operating with a double toothed rack 16 and a projection 64 for engagement with a margin stop 41. The teeth 25, 26 on the rack 16 may be set so that one series of teeth co-operates with the pawl 17 by the operation of a letter-space-setting lever 35 having an over dead-centre biasing spring mechanism 30, 32. Movement of the lever 35 is transmitted via linkage 85, 83, 84 so that an elongated bail 81 moves transversely from the position shown in full, to the dotted line position. The bail 81 is positioned below a double toothed rack 42, the teeth 51, 56 corresponding to the two different letter-spaces. Slidably mounted on the rack is the margin stop assembly 41 including a control member 43 and a double pawl 67 with pins 65, 66 for respective engagement with the teeth 51, 56. The pawl is biased into engagement with the respective side of the rack 42 by an overcentre spring mechanism 71 according to the setting of the bail 81. To set the margin stop the control member 43 is pressed inwardly to release the pawl 67 by engagement of pins 99, or 73 according to how the pawl 67 is set and moved sideways to reposition the margin stop assembly 41 on the rack 42.

公开(公告)号：DK111689B

公开(公告)日：1968-09-30

申请号：DK163761

申请日：1961-04-21

Applicant: IBM

Inventor： WALKER G ,  DODGE R ,  PALMER L

IPC: B41J1/60 ,  B41J7/34

Abstract: 925,011. Typewriters. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 26, 1961 [May 2, 1960], No. 15054/61. Class 100 (4). [Also in Group XXIV] In a typewriter, e.g. as described in Specification 873,920, wherein a printing head 4 with a part-spherical surface is rotated against spring action from an initial position by a band 3 to position a type to be printed, and the band is operated by a pulley 27 on a lever 1 connected by a link 2 to mechanism which controls the movement of the lever 1, the lever is constructed so that compensation is automatically effected for inaccuracy in the positioning of the type due to wear in the parts. The lever 1 includes arms 35 pivoted about a shaft 25 mounted on a bracket 54, and carrying the pulley 27 at their upper end by means of a bolt 47, Fig. 3. On the head of the bolt 47 is an eccentric pin 50 which, at the end of clockwise movement of the arms 35 first engages a leaf-spring 51, Fig. 4 (not shown), on the frame 52 and then abuts against the frame, such movement causing rotation of the head 4 to the fifth letter of a row thereon, i.e. a distance of five units. Mounted on the shaft 25 between the arms 35 is a member 56, Fig. 3, with arms 60, 63, 66 and an eccentric hub 57, a spring 64 connecting the arm 63 to a stud 38 on the arms 35 so that the arm 60 is held against an eccentrically-mounted stop 61 on the arms 35. The arm 66 engages the bracket 54 in certain positions of the mechanism as referred to later. Pivoted on the hub 57 is a two-part lever, one part 76 having a flanged hole 70 fitting on the hub and an arm 77 connected by a spring 78 to the stud 38, and the other part 72 having a slot 71 fitting over the flange 70 and being connected to the part 76 by a bolt 74 passing through a narrow lower part 73 of the slot 71 into a hole 75 in the part 76. The lever 72, 76, which is subject to the action of a spring 87, Fig. 1, is adjustable in length by means of the bolt-and-slot arrangement 73, 74, and is pivoted at its lower end to the link 2 connected to mechanism controlling the movement of the link 2 and lever 1 so as to position the type face required to be printed. A roller 82 rides freely in slots 80 in the arms 35 and, before any wear in the parts occurs, is held at the top of the slot by an inclined surface 86 on an arm 68 of the lever part 76. Initially the length of the lever 72, 76 and the position of the eccentric pin 50 so adjusted that the requisite movement of the type-head is attained. Just after four units of such movement of the typehead, the pin 50 engages the leaf-spring 51, Fig. 4 (not shown), and the arm 66 engages the bracket 54 so that the lever 72, 76 now rotates about the centre of eccentric hub 57, i.e. its lower arm is shortened and its upper arm lengthened. The fifth position of movement is always correctly determined by the engagement of the eccentric pin 50 with the frame 52, but if wear has occurred, this engagement takes place before the link 2 has completed its movement. Further movement of the link then causes the lever 72, 76 to move clockwise relatively to the arms 35 thus allowing the roller 82 to drop in the slot 80 a distance corresponding to such movement, and so setting the lever in relation to the arms to compensate for the wear. When sufficient wear to cause the roller to drop to the bottom of the slot has occurred, manual resetting has to be effected.