Patent GB-937309-A (GB)
Title: Improvements in or relating to paper-feeding mechanism
Inventor: MUNDAY BASIL SIDNEY
IPC: B41L47/24
Filed: 1961-01-05
Abstract: 937,309. Typewriters; feeding webs. INTERNATIONAL COMPUTERS & TABULATORS Ltd. Sept. 26, 1961 [Jan. 5, 1961], No. 569/61. Classes 100 (1) and 100 (4). [Also in Group XXIV] In a printing apparatus such as described in Specification 707,736, having a reciprocating stylus producing characters on a web of paper, the paper feeding mechanism comprises paperfeeding means, driving means coupled to the paper-feeding means and including a drive shaft, a set of Geneva drives to effect rotation of the shaft, the Geneva drives including a plurality of differential gears each adapted to operate the feeding means by an incremental value equal to a predetermined number of line spaces, and a set of perforated tape controlled solenoids selectively to operate the Geneva drives either individually or simultaneously in any combination to effect paper-feeding according to the sum of the incremental values thereof. Web-feeding arrangements.-The paper-feeding means 4 (in Fig. 2, not shown), advancing a web of paper 1 at a constant linear speed during imprinting are driven by a drive shaft 15 in Fig. 5, through one or other of a pair of gear-wheels 16, 17 slidable axially thereon to mesh with one or other of two gear-wheels 18, 19 rotatable with an output shaft 20 with the pair of wheels 16, 18 and 17, 19, providing eight and six lines of printing to the inch, respectively. Line-spacing mechanism.-To provide linespacing between successive lines of printing the spacing mechanism is arranged to effect such spacing by incremental values of 1, 2, 4, 8 or 16 line spaces or by any combination of these values giving line spacings varying between 1 to 31. Single-line spacing is initiated by a one-revolution clutch 43 in Fig. 3, engaging a gear-wheel 42, which rotates a first Geneva driver 41, to cause a single pin 50 thereon to rotate a Geneva cross 53 through 90 degrees and to rotate a gear 59, which in turn rotates cage gears 66 thereby to rotate a stub shaft 65 and differential gear 70, mounted fixedly on the shaft, which in turn rotates cage gears 68, fast on the shaft 67 with which a line-space feeding gear 71, meshing with gear 100 in Fig. 5, is rotatable to superimpose on a driving gear 72 the motion effecting single-line spacing. At this time the differential gears 63 and 64 are held stationary by gears 57 and 58 of the two and four-line spacing Geneva drives, respectively. Two-line spacing is affected by a clutch 46, and the Geneva cross 59 through a differential gear 63, cage gears 66 transmits the rotation of the gear 71, differential gears 62, 64 being held stationary. Four-line spacing is initiated in a similar manner by a clutch 49. To obtain, say seven-line spacing all three clutches 43, 46, 49 are operated simultaneously and the differential gears 62, 63, 64 in unison effect rotation of the gear 71 according to the sum of the incremental values of the operated differential gears. An eight or sixteenline spacing is obtained from the Geneva crosses 88, 96, in Fig. 6, driving gears 85, 102 respectively, which in turn through the respective differential gears 93 or 104 operate the driving wheel 72. The Geneva drivers 90 and 97 have each three pins 89 and 98 respectively. Perforated tape-controlled driving mechanism.- The solenoids (not shown) for operating the line-space feeding clutches of the Geneva drives may receive selectively or simultaneously their operating signals from a perforated tape (not shown), lengthwise movement of which is controlled from the output shaft 20 through skew gears 121, 122, in Fig. 5, and a shaft 123 rotated by the skew gear 122.