Patent GB-233072-A (GB)
Title: Improvements in or relating to spacing mechanism for typewriters
IPC: B41J19/14
Filed: 1924-02-14
Abstract: 233,072. Peeters, H. Feb. 14, 1924. Back-spacing mechanism; carriage-releasing arrangements; carriage-returning mechanism.-Relates to machines of the kind wherein the carriage is spring- driven in the direction of writing and is traversed in the return direction by a hand-lever geared to a toothed wheel meshing with the carriage rack. The hand-lever consists of two parallel rods 106, 117, Fig. 1, coupled together by yokes 118, 119 so that they can be rotated independently by handles 120, 121 to open the carriage-releasing mechanism and line-spacing mechanism respectively, and can also be moved by translation, in a direction parallel to the movement of the carriage, the extent of their movement corresponding with the movement of the carriage. The rear ends of the rods 106, 117 are fitted within the yoke 119 in the cross-bar 114 of an oscillating frame consisting of a pair of side arms 113 pivoted at one end on fixed pivots 115 and at the other end to the cross-bar 114. one of the arms 113 also being connected by a link 116 to a rack 100 which is longitudinally movable within guides 112. The rack 100 meshes with a pinion 107 at the lower end of a vertical countershaft 102 mounted in a collar 135 secured to the carriage bed, and a pinion 105 at the upper end meshes with the carriage rack 103. A helical driving spring 101 surrounds the countershaft 102 and is connected between the collar 135 and the upper end of the countershaft. The lever rod 106 is provided with a pair of lateral arms 128 carrying between them a roller 127 which bears upon a pivoted horizontal bar 129 when the handle 120 is rotated in a clockwise direction, thereby swinging the bar about fixed pivots 123 and depressing a pivoted lever 131 to release the escapement mechanism. A stop 130 is provided to limit the movement of the bar 129. In a modification wherein the carriage direction can be reversed for writing oriental languages, the rod 117 is mounted above rod 106 and both rods are provided with. arms on each side carrying rollers to actuate the pivoted horizontal bars when the operating handles are rotated in either direction. The carriage return may be effected simultaneously with the line-spacing by rotating the handle 121 and simultaneously swinging the yoked rods 106, 117 to the right. This also effects the tensioning of the driving-spring 101. Carriage scales.-In order to measure the travel of the carriage on a scale 138, the rods 106, 117 carry a pointer 136 near their ends and are each made in two telescopic sections to enable the pointer to move within a slot 137 in the scale. Letter-spacing mechanism. - To enable the machine to be used for oriental languages a reversing train 141 - - 143, Fig. 3, is geared to the pinion 105, and the carriage-rack 103 is arranged on a frame 144, Fig. 2, which is movable in a vertical direction on the carriage 60 by means of a cam 140 to enable the rack 103 to engage either the pinion 105 or the reversing- pinion 141. To ensure that the direction of rotation of the escapement wheel remains the same for either direction of movement of the carriage, the frame 144 is provided with oppositely-directed racks 134, 145 respectively to engage the pinion 133 on the escapement wheel shaft when the carriage rack 103 is engaged by the pinion 105 or bv the reversing pinion 141. Line-spacing mechanism.-The rod 117, Fig. 1, is provided with lateral arms 126 supporting a roller 125 which bears upon a pivoted horizontal bar 122 when the operating handle 121 of the rod is rotated clockwise, thereby raising the bar about its end pivots 123, and actuating the linespacing ratchet 70 through an intermediate link 124. A stop 99 limits the upward movement of the horizontal bar 122. Specifications 233,071, 233,073, and 233,074 are referred to.