Patent GB-1052016-A (GB)
IPC: B41J1/48
Abstract: 1,052,016. Selective-printing apparatus. BELL PUNCH CO. Ltd. Dec. 24, 1963 [Dec. 28, 1962], No. 48803/62. Heading B6F. A printing apparatus, more particularly for printing data on cheques or other documents in magnetic ink, comprises a holder into which the document is inserted for printing, and having means to sense when the document is correctly inserted, a number of settable printing members, and means to sense data set up in a calculating machine and to set the printing members according to such data. Paper supports.-The document holder comprises two plates 3, 4, Fig. 4, spaced apart by flanges serving to locate the document correctly, and sensing fingers 7, Fig. 1 (not shown), projecting through the flanges so as to close microswitches in series with a motor-starting switch 44, Fig. 2, when the document is inserted. Apertures are provided in the plates 3, 4 at the location where printing is to be effected. Operation of the switch 44 also energizes a solenoid 73, Fig. 5, which through levers 74, 76, operates pads 77 to clamp the document in position. Type-wheel machines; type-selecting mechanism.-Keys 10, Fig. 2, of the calculating machine are operated to enter amounts and add them up, and upon actuation of the drive motor 40, as described later, racks 9 are moved according to the denominations of the total. Each rack 9 is associated with a slider 11, constituting sensing means, pressed towards its rack by a spring 21 attached to a lever 14 having a part 12 bearing against a pin 13 on the slider. The lower end of the lever 14 bears against a pin 16 on a slider 17, each slider 17 being connected by a flexible cable 18 to a slider 22, Fig. 4, urged upwardly by a spring 22a. A rack 23 on each slider 22 is coupled by gearing 24, 25 to a corresponding type-wheel 26 which is thus set according to the position of the rack 9 of the calculating machine. Aligning for impression is effected by pawls 27, 28 engaging respectively the gears 25 and the gears on the typewheels, these pawls being freed during type setting by stirrups 69, 70 actuated by cams on a main shaft 43 driven from the motor 40 through a one-revolution clutch 42, Fig. 5. Driving arrangements.-Operation of the starting switch 44, Fig. 2, causes energizing of a solenoid 46, Fig. 4, which through intermediate devices 47 ... 49 releases a latch 49a from engagement with a lever 50, so that the latter can swing under spring action to close a switch 53 of the motor 40 to start the latter. At the same time an arm 55, Fig. 5, on the lever 50 acts to couple up the one revolution clutch 42 so that the main shaft 43 is driven. Another switch 45, Fig. 2, is provided whereby the printing devices can be disconnected from the calculating machine. Hammer-impression arrangements.-Hammers 66, Fig. 4, are pivoted on a spindle 60 and are pulled by springs 66a against a stop 62 on a framework 59, 61 also pivoted at 60 and urged by a spring 64 to hold a roller 58 thereon in contact with a cam 57 on the main shaft 43. During printing, the cam 57 causes the assemblage 59, 61, 66 to move sharply in a clockwise direction until the part 61 brings up against a screwed stop 65 whereupon the hammers 66 continue to move forward under their momentum to effect an impression. Ink-ribbon mechanism.-The ink ribbon 30 passes from a supply spool 31, Fig. 4, over guide rollers to the printing position and then over further guide rollers 33, Fig. 5, to a feedroller 34 and a take-up spool 35. The roller 34 is rotated to present a new piece of ribbon to the type prior to each printing operation and for this purpose is driven from the shaft 43 by a gear 72 having teeth on part only of its periphery so that no feed takes place whilst printing is taking place. The spool 35 rests on two rollers 37 driven by belts 38, 39, Fig. 3 (not shown), from the motor so that the spool 35 is rotated when the roller 34 is rotated but is otherwise held stationary by the ribbon tension. A feeler 79, Fig. 4, engages the ribbon on the supply spool and, when the spool is nearly exhausted, closes a switch 80 to light an indicator lamp.