Patent GB-101329-A (GB)
Title: Improvements in or relating to Printing Telegraph Systems.
Inventor: CARDWELL ALLEN DONALD
IPC: H04L17/26
Filed: 1915-06-07
Abstract: 101,329. Cardwell, A. D. June 7, 1915. Electric type-wheel actions and case-shift mechanism.-In a type-printing telegraph system the type-wheel has two normal positions, and means are provided for moving the wheel to and retaining it in its second normal position, or to move it progressively to and beyond its second normal position. The typewheel is provided with four rows of type and may be given a longitudinal movement in addition to its rotary movement. The printing apparatus is controlled by the keyboard transmitter described in Specification 8451/15, [Class 40 (iii), Telegraphs, Electric]. Specification 17439/13, which describes a typewheel actuating mechanism, also is referred to. The type-wheel 14 is splined to a shaft 12, Figs. 3 and 6, rotated by a pinion 16 and a tooth sector 17, whereby the characters of one annular row of type are brought successively opposite the printing-hammer 15. The sector 17 is mounted on an arm 18, pivoted on a shaft 19, to which is secured an arm 20. The arm 18 is given an angular movement due to the angular motion of the arm 20, while an additional rotation, if necessary, is given to the arm 18 by causing an arm 21 provided with an inclined slot to slide relatively to the arm 20. The movements of the arm 18 are limited by stops 34. To rotate the type-wheel 14 four steps, a magnet 1<d>, Fig. 2, is energized to cause a lever 35, pivotally connected to the lever 37 at the point 36, Fig. 4, to move the arm 18 by means of a stud 38, Figs. 4 and 6, and the levers 20, 23, through the correct angle. To move the type-wheel 14 one step a magnet 3d, Fig 2, is energized in series with a companion magnet. The energization of the magnet 3d causes its armature 3e, Figs. 2 and 6, to move the arm 21, through the rod 40 and piece 42, until the armature 3<e> is arrested by the stop 2<d>@. To move the type-wheel two steps, the magnet 2d is energized in series with a companion magnet, thereby causing the armature 3e to move the arms 21 until the armature 3e is arrested by the stop 3d<1>. Similarly, the type-wheel is moved three steps by energization of the magnets 2<d>, 3<d>, and their companion magnets, and by energizing the magnet 1<d> with 2d or 3d, or both, the typewheel is moved five, six, or seven steps. The typewheel is moved seven steps from the normal position 14<b>, Fig. 15, to the " figureshift" position 14<c> by the energization of a magnet 0, Fig 2, controlled by the figure-shift key, whereby the arm 37 with its slot connexion 37<a>, 38 moves the arm 18 through the correct angle, while the arm 18 is prevented from returning the type-wheel to its normal position 14b by a stop 49, which is released by the energization of a magnet controlled by the keyboard switch. The type-wheel is moved from its figure-shift position 14c by the energization of the magnets 1<d>, 2d &c. To move the typewheel 14 along the shaft 12 to bring the rows of type 14g, 14f, 14h, Fig. 15, opposite the hammer 15, a lever 56, Figs. 6 and 8, is provided with a projection 56<1> engaging an annular groove 14e in the wheel 14. The lever 56 is adapted to be moved by the energization of the magnets 4<d>, 5d, or both, and is provided with a pin 65 engaging a slot 62<a> on the end of a lever 62 pivoted to a lever 64 at the point 63. The lever 64 is attached to the armature of the magnet 5d, while a slotted lever 60, pivoted at its lower end, is adapted to be operated by the magnet 4d. To bring the row 14f, Fig. 15, opposite the hammer 15, the magnet 4<d> is energized, whereby the lever 60 is drawn to the right to rotate the lever 62 in a clockwise direction about the point 63, thereby causing the lever 56 to rise through the action of the slot 62a. To bring the row 14<g> opposite the hammer, the magnet 5d is energized tc raise the lever 62 through the lever 64, the pin 61 sliding in the slot 60<a> of the lever 60 to cause the lever 56 to rise ; while to bring the row 14h opposite the hammer, both the magnets 4d, and 5d are energized. To retain the type-wheel 14 in its correct raised position, a notched lever 78, operated by the magnet Q, is caused to engage a projection 56b on the lever 56. Alining for impression.-To aline and retain the type-wheel 14 in its set angular position, the pinion 16, Figs. 3 and 6, is provided with a starwheel 16a adapted to be engaged by a projection 81 on an arm 77, which, together with an arm 78, is operated by a magnet Q, Fig. 8. Hammer - impression arrangements. - The printing-hammer 15, Figs. 10 and 13, operated by the armature T' of the printing-magnet T, Fig. 13, its mounted on a spring-controlled pivoted member 72, whereby it may be rotated to allow the paper-carriage 90 to be removed and inserted. Paper-carriages.-The carriage 90, Fig. 10, is mounted on guide-rails 92, 93 carried on rollers 94, and, after being placed in position, is held against rising by means of a spring-controlled pin 138 which extends over the rail 192. Web feeding and guiding arrangements.-A paper-roll is carried on a shaft 112 mounted on the carriage in bearings 115, 116, Figs. 10 and 12 The bearing 116 is opened and closed by a spring-controlled recessed piece 117, whereby the shaft 112 may be removed. The paper 114 is led from the roll under a feeding-roller 121, upon which it is pressed by a spring-controlled roller 122, and up between a rod 126 and a cutter plate 127. Electric line-spacing mechanism.-To feed the paper for line-spacing, the roller 121 is provided with a ratchet wheel 129 which is held against rotation in one direction by a detent 130. The roller 121 is operated in a stepby step manner by a pawl 131 mounted on a spring- controlled arm 132 secured to a shaft 133 journaled in the carriage 90. The arm 132 is provided with an extension 132a, which is engaged in any position of the carriage by an arm 135 operated by a magnet M, Fig 8. The roller 121 is operated on the deenergization of the magnet M which is energized by the operation of a linespacing key. Electric letters p a c i n g mechanism.- The carriage 90 is moved in a step-by-step manner by means of a magnet R, Fig. 12, the spring - controlled arrnature R<1> of which carries a pawl 85 engaging the ratchet-wheel 86 of a spring drum provided with a spur-wheel 88 engaging a rack 89. For letterspacing, the magnet R is energized in series with the printing - magnet T, and, when de-energized, a spring 91 causes the carriage to advance a letter space. The ratchet-wheel 86 is normally prevented from rotation in a clockwise direction by means of a spring-controlled pawl 97, pivoted at the point 98 and connected to the operating-pawl by means of a link 105. Electric back - spacing mechanism. - To backspace the carriage 90, a magnet N, Fig. 12, is energized to operate a lever 95, the free end of which bears upon a pin 96 on the link 105. The armature N<1> of the magnet N is maintained in its inoperative position by means of a spring 104, and when the magnat is energized the pawls 85, 97 are released from the ratchet-wheel 86, while a pawl 100 is caused to engage the wheel 86 in such a position that the wheel rotates in a clockwise direction through a distance equal to one-half the pitch of the teeth on the wheel when it is held by the pawl 100. When the magnet N is deenergized, the wheel 86 rotates through a distance equal to the other half of the pitch of the teeth. The magnet N is energized by the operation of a key Electric carriage-releasing arrangements and carriage-returning mcchanism.-To return the carriage to its starting position, a magnet P, Fig. 12, is energized, whereby its armature P' is caused to engage the pin 96, thereby releasing the pawls 85, 97 without actuating the pawl 100. The armature P<1> of the magnet P is normally drawn against a notch 107a in a spring-controlled lever 107, Figs. 12 and 13, by means of a spring 106 and, when operated by the magnet P, is retained in its position by means of a second notch 107<b> in the lever 107. The carriage is then returned to its starting position by means of the spring drum when a stop 89a on the carriage engages the bevelled end 109a of a lever 109 connected to the lever 107 by a pin 111. The armature P<1> is then released from the notch 107b by the movement of the lever 107 and again engages the notch 107a, whereupon the pawls 85, 97 will again engage the ratchet-wheel 86. The pawls 85, 97 may be released by the manual operation of the armature P'. The carriage is brought to rest by means of a spring or air dash-pot, the plunger B of which engages a projection C on the carriage. The plunger B is provided with an enlarged end b adapted to be engaged by a lever D provided with a projection d<1>. The lever D is so arranged that, as the carriage is moved from its starting position the plunger B is withdrawn from the cylinder A until the projection C depresses the lever D by engaging with its projection d<1>, thereby disengaging the lever D and plunger B. Ink-ribbon mechanism.-The ribbon 140 is carried upon reels 141, 142, Figs. 8 and 14; and passes through inclined slots 143<a> in a plate 143, Figs. 6 and 8, while the hammer strikes through an opening 144a in a shield 144. The reels 141, 142 are loosely journaled on a shaft 145 and are pressed against shoulders 149, 150 by means of springs 147, 148 bearing against collars 146 on the shaft. The reels are provided with teeth 153, 154 adapted to be engaged by teeth 152 on the ends of a clutch member 151 keyed to the shaft 145. The clutch member 151 is retained in engagement with one of the reels 141, 142 by means of a spring-controlled member adapted to engage recesses 151x in the member 151. The drive is shifted from one reel to the other, in accordance with the amount of ribbon on the reels, by means of a pair of forked levers 157, 157a, the arms 157 of which sngage the ribbon, while the arms 157a are adapted to engage cam-surfaces 151<a>, 151b on the member 151. The arm