Patent GB-127734-A (GB)
Title: Improvements in or relating to Keyboard Composing and Similar Machines.
IPC: B41B25/00
Filed: 1918-06-12
Abstract: 127,734. Lanston Monotype Corporation, (Lanston Monotype Machine Co.). June 12, 1918. Strip - perforating machines; justifying type; keyboards.- Relates to measuring- mechanism for typographical composing and like machines, and comprises means for causing the feedmovement of the measuring - member to occur in two stages, either of which can be varied. As applied to stripperforating machines, the feed-movement of the units - rack consists of a main movement controlled by the unit stops, and a supplementary movement controlled by a device such as that described below. The main and supplementary feed-movements may occur upon key-depression and release. respectively, this arrangement enabling the speed of the machine to be increased; further, shocks are reduced, since the travel of the units-rack at each stage is less than the normal travel. The device for varying the supplementary feed-movement may be associated with means for adding a fixed addition component or the transfer-component of a signal to character-signals. As applied to the strip-perforating machine described in Specification 17199/08, the retaining-pawl for the unitswheel 7 is formed as a sector 9, Fig. 2, which plays between a fixed stop 10 and an adjustable stop 21, formed on the end of a lever 36. The sector is pivoted on a bell-crank 3 connected by a link 2 to the usual lever 53, which is pivoted at 12 to the carrier 42 for the units-rack 11. The bell-crank is held against an adjustable stop 32 by a spring 30, and is connected to the sector by a spring 18. On depressing the keys, first, the carrier is raised to cause, the units-rack to engnge the units-wheel, and then the lever 53, by turning on the pivot 12, rocks the bell-crank and causes the sector to be released from the units-wheel. The units-wheel is then rotated by the motor 4 until the units-rack is arrested by one of the stops 13, which determine the main feed-movement. The sector, upon being released, drops by gravity aided by the spring 18, on to the stop 21. On releasing the keys, first, the lever 53, by turning on the pivot 12, causes the bell-crank to move the sector into engagement with the units-wheel, and then causes the units-rack to be released. The units-wheel can then rotate until the stop 10 arrests the sector, the supplementary feed-movement being normally two units. To prevent the units-rack from being released before the sector is engaged, the bell-crank 3 is connected to a slide 27 formed with a tooth 27<1>, which is positioned beneath a lug 42<1> on the carrier when the sector is released. The tooth is normally in register with a slot in the lug. The line-scale rack is restored to the initial position by the operation of the usual lever 74, which is now arranged to release the sector by engaging a lug 33 on the bell-crank 3. The lever 74 is operated by a tripping-motor which is controlled by a linerestorer key or, in some cases, by a justifying-key. On release of the line-restoring key, the lever 36 is rocked about the pivot 36<1> by a motor 34, the stop-end 21 being raised to retain the sector in engagement with the stop 10, so that the sector will re-engage the units-wheel without permitting of any further movement. The means for controlling the position of the lever 36 to determine the supplementary feed-movement comprises a keyboard switch-lever 45, Fig. 3, which can rock horizontally on a pivot 47. The switch-lever is formed with fingers 48, 49 for engaging bell-cranks 55, 55<1> having slot connexions with bars 50, 50' which are slotted to engage guide-pins 58, 58<1>. The bar 50 is formed with a lug 51 engaging an arm on the rock-shaft 174S that controls the operation of the transfer punch. The bar 50' is formed with a lug 51<1> engaging an arm on the rock-shaft 174F, controlling the operation of a punch for the addition of a fixed-value component to a signal. The bars 50, 50<1> are also formed with lugs 54, 54<1> adapted, when the bars are moved laterally, to engage arms on the rockshafts 174P that control the punches of one component of a signal. The bell-crank 55<1> is connected by bell-cranks 65, 68 and a link 67 to a iever 69, Fig. 2, which is pivoted at 70 and is provided with a hook 71 for engaging a pin 72 on the stop-lever 36. When the switch lever is set to the right and one of the character-keys is depressed, the transfer or justification component is added to the character signal; further, the motor 34 is operated to raise the stop 21, as described above, in order that the value of a character-signal associated with the transfer component may be registered as two units less than the normal. The reduction compensates automatically for the reduction in value of such character signals by the caster. The space key also is arranged to operate the motor 34. When the switch lever is set to the left and one of the character-keys is depressed, the fixed addition component is added to the signal, and the hook 71 is released from the pin 72, the stop lever 36 being then moved by a spring 73 until the shoulder 78 engages one of a series of stops 80. The stop 21 is thus positioned to adjust the supplementary feed-movement of the units-wheel, the full value of the signal being registered under these conditions. The stops 80 consist of screws projecting graded distances from the rim 81 of a disk 82, which can be turned to bring any stop into position, and is secured by a spring detent 84. There may be, as shown, nine stops, which are adjusted to permit of the sector 10 performing supplementary movements of from one to nine units. The switch lever 45 is returned to the middle position by a spring 63<1> which is arranged between the bell-cranks 55, 51' and holds them against a stop. The switch lever is engaged by a catch lever 86, Fig. 3, which is urged by a spring 88 and locks the switch-lever to the right or left position. The catch lever can be released by hand, or automatically by a motor 96 which operates a lever 93 connected by a link 92 to the catch lever. The motor 96 is arranged to release the catch lever at each line-restoring operation, for the purpose of preventing the fixed addition from being added to the first character in a line, and thereby causing the printed line to be indented. Specifications 30036/10, 15988/13, 15989/13, 103,338, and 111,703 also are referred to.