Patent GB-428061-A (GB)
Title: Improvements in or relating to paper feeding mechanism for typewriters and like machines
IPC: B41J11/36
Filed: 1933-11-01
Abstract: 428,061. Typewriters &c. CAMPOS, F., 4, Rue DufrÚnoy, Paris. Nov. 1, 1933, No. 30350. [Class 100 (iv)] Paper feeding and guiding arrangements; ink-ribbon mechanism.- Paper-feeding mechanism for typewriters and like machines comprises line-spacing mechanism for feeding line by line a web of paper having cut-away portions located at predetermined intervals along its length, auxiliary feed rolls narrower than the width of the cut-away portions of the paper, which feed rolls are inoperative during the line-spacing operation, and means for rendering the auxiliary rolls operative at will to grip the paper whereby the auxiliary rolls pull the paper through the line-spacing mechanism until movement of the paper is arrested owing to cut-away portions reaching the auxiliary rolls. The invention is described as applied to a book-keeping machine of the type described in Specification 377,957. The journal web 1 and form-sheet web 2 are led from rolls between lengths 5<a>, 5b of ink ribbon arranged beneath the platen 740, and pass between a main-driving roll 6 and a driven roll 7 mounted in spring-pressed arms 9. The web 1 then passes around the roll 6 to a storage roll, while the web 2 is led between two guide plates 14, 15 supported by two pivoted arms 32, (not shown), which carry the shaft 8 of the roll 6. Mounted in apertures in the plate 14 are two small rolls 17 over which the form-web 2 passes. The outer plate 15 is apertured opposite the rolls 17, and is hinged at 15b and spring-pressed towards the web 2. A pair of auxiliary feed rolls 21, disposed adjacent to but normally separated from the small rolls 17, are secured to a shaft 22 geared to a shaft 24 which is adapted to be driven from a clutch-operated pulley. The shaft 22 is freely mounted in arms 23 pivoted on the shaft 24. During item printing both webs are driven by the roll 6 from line-spacing mechanism, but the form-web 2 is adapted to receive longer feed movements between item printing to bring the forms in the web into printing position, and for this purpose is provided with holes of a width larger than the width of the auxiliary rolls 21 and disposed in those parts of the web over which the rolls 21 operate. The holes in the web 2 are preferably arranged opposite the last line of the printed heading on each form. A single control means is provided whereby the main driving roll 6 is raised from the roll 7, and the auxiliary driving rolls 21 co-operate with the rolls 17 to feed the form-web 2 until the next set of holes in the web reach these rolls, whereupon the feed stops. The control means consists of a handle and a system of levers. When the handle is moved clockwise, as seen from above, the pivoted arms 32 of the roll 6 are raised and the pulley from which the shaft 24 is driven is clutched to one of a pair of power-driven pulleys, driven in opposite directions, whereby the rolls 21 are rotated. When the arms 32 of the roll 6 are raised the pivot of the outer guide plate 15 is engaged by notches 23a of the arms 23, the latter being spring-pressed into engagement about the pivot shaft 24, and the auxiliary feed rolls 21 engage the form-web 2 for the long feed. In a modification the auxiliary feed rolls 21 may be brought into operation automatically to feed the form-web 2 forward after a predetermined number of operations of the machine by the cyclic control device described in Specification 328,319, [Class 106 (i)]. The machine also comprises means for feeding double ledger leaves into printing position, and then feeding them out in the reverse direction. The ledger leaf 58 is of transparent paper and folded double prior to insertion in the machine, and the upper edge 58<a> of the sheet projects beyond the edge of the lower sheet. The folded leaf is fed by hand between a driving roll 59, secured to the shaft 24, and a driven roll 60 mounted between the arms 9, so that the upper edge 58<a> passes over, and the lower edge passes under, a comb plate 62. The plate 62 is carried at the ends of arms pivoted to the arms 32 of the feed roller 6, so that the plate will be lifted with the roller 6. An ink ribbon length 5<c>, which is below and may be a continuation of the ribbon lengths 5<a>, 5b, is supported on members of the comb plate 62. As shown, the ink ribbon is fed from one spool 100<a> to a similar spool 100<a> and passes over the printing types three times, being supported by guide rollers. The guide rollers 70, 74, 74<a> and 74b are carried by the two arms 32, and the guide rollers 72, 73 are stationarily mounted. To allow of the feeding of the folded ledger leaf 58 into printing position the main feed roller 6 is lifted by movement of the control handle, whereupon the length 5<c> of ink ribbon is slackened and moved upwardly from the printing types by the comb plate 62. To initiate feeding of the ledger leaf 58 the control handle is moved counterclockwise, as seen from above, whereby the main feed roll 6 is moved to its highest position. In this position the auxiliary feed rolls 21 cannot co-operate with the small rolls 17, but the arms 9 can move upwardly under spring action so that the feed rolls 59 and 60 can grip the ledger leaf. Movement of the control handle also clutches the pulley, from which the shaft 24 is driven, to the second of the power-driven pulleys whereby the ledger leaf is fed into printing position, astride the ink-ribbon length 5<c>. The ledger leaf 58 is fed under the platen to a predetermined extent, the control handle is then moved to its middle position to allow the roll 6 to return, and printing is effected on the webs 1 and 2, and the two sheets of the ledger leaf. After printing, the control handle is moved clockwise whereby the main feed roll 6 is raised to the intermediate position to allow the auxiliary rolls 21 to feed the form-web 2 as before, and to allow the feed roll 59 to co-operate with the roll 60 to feed the ledger leaf 58 out in a direction opposite to that in which it was fed into the machine. Since the ledger leaf is adapted to be fed into printing position many times the means provided to ensure that it is fed into the correct position each time comprises a punching-device which, at the printing of each item, automatically punches a hole in the margin of the leaf, and a spring-influenced sensing pin is provided to sense the hole punched at the last printing position whereby the feed of the ledger leaf is stopped. As shown, the punching-mechanism comprises a hollow punch slidable in a vertical tubular guide 83 and connected to a bar 86 pivoted at one end to a bracket 87, and at the other end to a link 88 which is operated from levers pivoted and operated as described in Specification 377,957. Means is provided for ensuring the retraction of the punch at each operation. The sensing- pin 81 is mounted to slide within the hollow punch, and is pivoted to the end of an arm 92 secured to a shaft 93. A pawl 95 also pivotally secured to the shaft 93 is controlled by means connected to the main control handle of the machine, so that when the latter is moved counterclockwise to allow the ledger leaf 58 to be fed into the machine the shaft 93 is allowed to rotate under the action of a spring until the sensing-pin 81 contacts the ledger leaf. As soon as the appropriate hole in the leaf 58 registers with the pin 81 the latter passes downwardly through the hole and the consequent further rotation of the shaft 93 brings the pawl 95 thereon into engagement with a ratchet-wheel secured to the shaft 24 on which feed roll 59 is secured, and the feed of the ledger leaf is arrested. Specification 428,062 also is referred to.