Patent GB-190812776-A (GB)
Title: Improvements in and relating to Spacing and Counting Devices for Typewriters, Type Space Indicators, Type Line Justifying Devices, Band Perforating Mechanisms and the like.
Inventor: LEAN CLEMENT
Filed: 1908-06-15
Granted: 1909-05-27
Abstract: 12,776. Lean, C., [Schnellsetzmaschinen Ges.]. June 15. Typewriters and like machines; type, setting.-Relates to variablefeed devices such as are employed in connexion with typewriter paper carriages, typespace indicators used in perforating-apparatus for making register bands for controlling type-setting machines, line-justifying devices, telegraphic bandperforating apparatus, &c. Two or m o r e independent ratchet feed-mechanisms operated by universal bars from the key mechanism may be combined together at will to produce a number of different additional feeds. The parts are shown applied to an Underwood typewriter, Fig. 1, in which key-levers 10 operate type-bars 18, and the platen is supported for change of case upon a rail 7. A carriage rack 25 gears with a pinion 26 on a shaft 27 provided with pivots 31, 32 for bevel-gears 33, 34 which mesh with bevel-gears 35, 36 connected with ratchet-wheels 21, 22, the rotations of which, under the influence of the carriage driving-spring, are controlled by pins of escapement pawls 40, 41, 55, 56. The swinging pawls 41, 56 are spring-controlled, their movements being limited by stops, and are pivoted upon plates to which the fixed pawls 40, 55 are secured. The plates are rigidly attached to shafts 49, 59, the ends of which have arms supporting links 63, 64 connected by universal bars 65, 66 underlying the key-levers. The ratchet mechanism above described may be replaced by any other usually employed in typewriters. Each key-lever 10 is provided with one or two shoulders 67, 68 which operate either or both of the ratchet mechanisms so as to produce three different amounts of carriage feed, the third amount of feed being equal to the arithmetical mean of the two feeds produced independently by the separate ratchet mechanisms, Fig. 3 shows an arrangement in which four different ratchet mechanisms are employed, the pivots 71, 72, 73, 74 of the corresponding bevel-gears being carried by sleeves 69, 70 loose upon the shaft 27 and secured to the bevel gears 35, 36. The ratchet-wheels 83, 86 are attached to the bevelgears 79, 82 and the other two ratchet-wheels to the sleeves 69, 70. In this case, fifteen different amounts of carriage feed are obtainable, the angle of rotation of the shaft 27 being equal to the fourth part of the sum of all the angles of rotation of the ratchet-wheels. Fig. 4 shows a further modification in which the pivot of a pinion 104 is secured to the carriage or other part to be moved and two racks 98, 99 are displaceable under the influence of the driving-spring. The movements of either rack are controlled by escapements comprising fixed teeth 111 on levers 106 mounted on pivots 108, and teeth 112 on members slidable lengthways on the levers 106. Three different feeds are obtainable, and, if both racks are moved simultaneously, the extent of movement of the pivot of the pinion is equal to half the sum of the movements of the racks. Fig. 1 shows two types on the type-bar 18 which may be of different width, so that it is desirable that the carriage may be fed to an extent corresponding with the change of width, when a shift key 120 is depressed. This depression operates members 121, 122, 123, 124, 125 to move the bars 65, 66 beneath one or two additional shoulders 87, 88 on the key-levers 10. Fig. 5 shows a further modification in which two ratchet-wheels 133, 135 on a sleeve 134 are provided. A fixed tooth 131 on a disk 130 secured to the shaft 27 and a movable tooth 132 provide an escapement for the wheel 133 when it is displaced axially by means of the bar 65, and the escapement for the wheel 135 consists of a device, rocked by a bar 66, comprising fixed and loose pawls wide enough to allow the axial displacement of the wheels. Three different feeds are obtainable. A larger number of feeds may be obtained by the arrangement of the disk 130 upon a sleeve which carries a ratchet-wheel co-operating with escapement mechanism. Fig. 8 shows a further modification in which the bevel-gears described in connexion with Fig. 1 are combined with four ratchet-wheels on sleeves 167, 171, the escapements of each pair of wheels being similar to those of the wheels 133, 135, Fig. 5, and the fixed teeth 160,162 being carried by the bevel-gears.. Fifteen different feeds are obtainable. When the various mechanisms are used in telegraphic hand-perforating apparatus the paper is fed to varying extents according to the lengths of the perforated symbols. In the case of type-space indicators and line-justifying devices, the mechanisms are operated by the keys of the composing or band-perforating machine, the breadth of the characters in a line being registered by a pointer and scale. Instead of a device having a pointer, the paper-carriage of a typewriter connected with the apparatus for perforating the typesetting band may be employed as a type-space indicator or justifying-device. Such an arrangement is described in Specification No. 402, A.D. 1907.