Patent GB-237602-A (GB)
Abstract: 237,602. National Cash Register Co., (Assignees of Robertson, W. H.). July 28, 1924, [Convention date]. Web - feeding arrangements; linespacing mechanism. - In a lever-key set and operated machine, items and totals are printed upon the record-strip by the operation of the machine effected by means of an amount key and the total key respectively. The record-strip shifted automatically to- and-fro between an autograph slot and the type-wheels is normally in a slack condition and is made taut for impression. the item type-wheels 37 and the total type wheels 198 are actuated in the usual manner from the amount keys 30 by means of the actuating segments 35. The strip passes from the supply roll 141 over a part-cylindrical guard plate 142, around a roller 139, back again over the guard plate to guide rollers 144, Fig. 10, along the ink-ribbon guard 95 and around rollers 140, 143 to the receiving spool 146. The rollers 139, 140 are mounted on rocking arms 135, 137 loose on shaft 166 and geared to sectors 130, 131 connected by springs 133 to an abutting pin 132 on a lever 126 linked with the key coupler 66. The strip is normally loose and when the machine is operated the rocking of the coupler oscillates the arms 135, 137 first clockwise and then counterclockwise, thus shifting the strip so that the next line is moved from the writing aperture 116 to the printing line and, after impression, returned so as to be observable through the glass cover plate 120. In order that the strip may be in stretched condition for receiving the impression the arm 137 is rocked somewhat farther than arm 135, this being effected by making the sectors 130, 131 of slightly different length to give one a longer stroke than the other, the strokes being delimited by a stop pin 150. As the total type is located nearer the front than the item type means are provided to cause a greater shift of the strip when total-printing. To this end the stop pin 150 is mounted on an arm 151 connected with an arm 208 cam-slotted at 207 to co-operate with a pin 206 on the total key 205 so that when this is depressed to operate the machine to take a total the pin 150 is displaced to permit a longer stroke of the sectors 130, 131. During the return shift of the strip the receiving roll is fed for linespacing by means of a friction pawl 171 carried by a lever 160, Fig. 11, having a stud 161 engaging an abutment on the rocking arm 137. The lever 160 carries an arm 163 a stud 164 on which is engaged by a spring encircling the shaft 166 so as to maintain stud 161 in contact with the abutment. The stroke of the lever 160 is limited by engagement of a pin 167 on arm 163 with a shaped edge 168 of the stationary frame 128 but as the receiving roll increases in diameter a bent rod 180 carried bv the arm 163 and bearing against the roll raises the arm about its pivot on the lever so as to shorten the stroke. The supply and receiving rolls are mounted in the frame 128 pivoted at 99, Fig. 4, and normally held in operative position by a catch lever 220. To render the rolls accessible this lever is displaced to disengage the shoulders 221, 222 whereupon the frame may be swung up. While the frame is out of position the lever is maintained displaced by the stationary edge 227, and a flange 225 upon the lever is thus held in engagement with the teeth on the arms 135, 137 so as to secure them until the frame is returned. Hammer-impression arrangennents.-The item and total printing hammers 114, 216 are coaxially mounted and are selectively operated by a lever 105 rocked by a cam 101 on the main shaft. In the position of the parts shown in Fig. 8 the item hammer follows the stud 110 on the lever during the preparatory movement and is therefore subsequently operated, but the total hammer is restrained by a flange 210 on a pitman 209 pivotally connected to arm 151 referred to above. When the total key is used therefore the pitman is lowered to remove the flange to free the total hammer and another flange 211 is positioned opposite the pin 217 on the item hammer which is thus disabled. Ink-ribbon mechanisms. - According to the Specification, as open to inspection under Sect. 91 (3) (a) the ink-ribbon passes from one to the other of two rollers 92, Fig. 8 (Cancelled), and is fed step-by-step by a ratchet feed operated from the key coupler through a link 71. This link rocks a lever 75 notched at 81 to engage a spring-controlled pawl 82 carried by an arm 84 and engaging by its pivot pin 83 a slide-bar 90 formed as a pawl at each end. When the ribbon has been traversed to its limit in one direction the pawl 82 slips into the other notch 81 and the feed is consequently reversed. This subjectmatter does not appear in the Specification as accepted.