Patent GB-411845-A (GB)
Title: Improvements in machines for preparing tapes for controlling type composing machines
IPC: B41B25/00
Filed: 1932-12-13
Abstract: 411,845. Type-making machines. TELETYPE CORPORATION, 1400, Wrightwood Avenue, Chicago, U.S.A.-(Assignees of Potts, L. M. ; 1202, Maple Avenue, Evanston, Illinois, U.S.A.) Dec. 13, 1932, No. 35323. Convention date, Dec. 23, 1931. [Class 100 (iii).] Strip-perforating machines ; justifying type ; keyboards.-A machine for perforating strips for controlling composing- machines, particularly those of the line-casting type, is provided with indicating - mechanism for representing the length of line composed and the space remaining to be filled, and with an interchangeable codebar unit for effecting the measurement of types of different fount. Indicating-mechanism. The indicator is substantially the same as that described in Specification 355,933, and comprises a cylindrical chart or drum 88, Fig. 1, bearing a series of scales, one of which is visible through a slot 107, and a co-operating helical shutter 89, the edge of which indicates on the scale the progress of the line. The scales represent different numbers of spacebands from 0 to 9, and the chart bears two identical series of scales, so that a halfrotation is sufficient to restore it to initial position. The chart is rotated a step for each spaceband inserted in the line, and the shutter is rotated a varying amount at each keydepression according to the width of the character represented. The chart is carried by a shaft 21, Fig. 6, which is driven from an electromotor through a gear 19, which is loosely mounted on the shaft and is connected thereto by a friction device. The rotation of the shaft is controlled by an escapementmechanism, which is operated by the space-key. The shutter 89 is loosely mounted on the shaft 21, and carries a gear 91 meshing with a gear 117, Fig. 4, on a units-wheel shaft 111, by which the shutter is rotated. As the line approaches completion, a signal-lamp is lighted, the circuit of the lamp being closed by a rocking bar 98, which is under the control of cams 96, 99 attached to the chart 88 and the shutter 89 respectively. The chart is interchangeable, so as to permit of composition in different founts. Units-counting mechanism. The units-wheel shaft 111, Fig. 4, is frictionally driven, and carries a units-wheel 113, which is engaged by stationary and movable pawls 125, 126. At each depression of a key, a cam 32 on an operating-shaft 20 is permitted to make a halfrotation, which moves the pawl 126 into engagement with the units-wheel and retracts the holding-pawl 125, The units-wheel then rotates until the pawl 126 is arrested by one of a number of stop-bars 127, which are projected by the keys. The stop-bars are locked during the counting-operation by a detent-bar 143. The shaft 20 rotates continuously, and the cam 32 is at first driven therefrom through a friction device, and is afterwards positively driven by a grab-clutch, the sliding member 33 of which is caused to engage the driving member 36 by a cam 37, which co-operates with a fixed stop 38. At the end of a line, both of the pawls 125, 126 are retracted, to allow the units-wheel to return to initial position, in which it is arrested by a stop-arm 168. Perforating - mechanism. The punches 213, Fig. 16, are mounted in an inclined punch-block 208, and are operated by notched interponent-bars 201, which can slide through holes in an actuating- lever 192, which is operated by the cam 32 that actuates the unitscounting mechanism. An arm on the lever 192 operates the tape-feed ratchet-mechanism, and a backspace lever 235 is provided. The punches may be operated by an electromagnet instead of by a cam. Permutation mechanism. The key-levers 5, Fig. 20, act through notched code-bars 242 on permutation bars 241, which are supported at their ends by pivoted links, and, when depressed by the code-bars, rock levers 185, 186, which are connected to the punch-interponent bars 201 and the units stop-bars 127 respectively. A special lever 184 acts through a lever 142, Fig. 4, to disable the counting-mechanism, when perforation is to be effected without counting, as in the case of spacing and shift signals. The code-bars are mounted in a frame, which can be slid into the machine, and forms an interchangeable unit, so that composition can be effected in different founts. The frame is adjustable into either a front or a rear position under the action of shift-keys, to provide for upper and lower case characters. Key-action. Each key-lever 5, Fig. 29, has associated with it a sliding member 282, which when the key is depressed, is moved to the left by a link 292 and a lever 288. A shoulder 294 on the member 282 is thereby brought between an operating-bail 295 and the code-bar 242 corresponding to the key-lever. The sliding movement of the member 292 rocks a bail 314 and displaces a trip-latch which supports the operating-bail 295. The bail 295 is thereupon depressed by a spring and operates the code-bar. An arm 318, Fig. 20, on the bail shaft 301 releases the frictionally-driven cam 32 that operates the units-counting and perforating devices, and a second cam resets the bail. Depression of the space-key bring into action a second operating-bail, which actuates the escapement of the indicating-chart and permits the chart to rotate a step. At the end of the line, an elevator or resetting key is depressed, which makes a perforation for operating the assembler-elevator of the casting-machine, and permits the rotation of a resetting-cam, which disengages the escapement-pawls of the unitswheel and the indicating-chart. A special train of gearing is provided to effect a quick return of the counting and indicating mechanism to initial position. The elevator-key also operates a line-counting device. A repeat-key is provided, which disengages the trip-latch of the operating-bail 295, so that the symbol corresponding to a depressed key is indefinitely repeated. Correction of errors. Means are provided for subtracting from the units-counting mechanism the units representing an incorrect word. A differential gear, which can be brought into action by a hand-operated brake, is interposed in the driving-mechanism of the indicating- shutter and serves to reverse its motion. The depression of the brake-lever also brings all the punch-interponent bars 201 into operative relation with the punches. In order to correct an error, the tape is back-spaced to the beginning of the incorrect word, and the same keys are depressed again, whilst the brake-lever is held depressed. The counting-mechanism is thereby rotated backwards, and all the punches are simultaneously operated, so as to cancel the incorrect signals. Tape-winding device. The tape-feed mechanism acts on a lever 221, Fig. 2, carrying a pawl 503 which rotates a ratchet-wheel 499 on the winding-on spool 495, so as to cause the spool to take up the slack in the tape. If the tape becomes too taut, it lifts a rod 505 and disengages the pawl from the ratchet-wheel.