Patent GB-678316-A (GB)
Title: Improvements in and relating to typewriter attachments for obtaining copies on superposed paper webs
IPC: B41J17/00
Filed: 1950-01-27
Abstract: 678,316. Typewriters &c. EGRY, Ltd. Jan. 27, 1950 [Jan. 29, 1949], No. 2246/50. Class 100 (iv). Paper supports; duplicating arrangements.- A typewriter attachment supporting a multipleweb 54 and travelling with the carriage has a retaining or engaging means which co-operates with the folded or tearing lines or longitudinally spaced apertures when a sheet or form length has been drawn through, the retaining means being automatically released on further rotation of the typewriter platen to feed the leading edge of the web past the said platen. The support is linked to the typewriter carriage to travel along a rail 9 and comprises a front plate 5, two side walls 4 strapped together by a channel 6 and a pair of flanges 72 formed on the walls on which slides a carbon-paper anchorage 68-71. At the lower end of the walls is the web retaining means shown as a blade 48 extending into a curved part 46 of a guide 44 having adjustable side stops or turned-up edges 55. Adjacent to the blade 48 is a flap 51, pivoted at 50 on a lug 49 on the walls 4 and having a pair of springs 52 upwardly extending to engage the web 54. The insides of the walls each support, by brackets 17, rods 18 upon which slide journals for a roller 19. The journals are urged into the upper position by chains 25 attached thereto and which extend over pulleys 26 attached to the walls 4 and are wound on pulleys 27 fixed on a shaft 28 geared by a pinion 29 and wheel 30 to a sleeve 31. The sleeve is mounted on a spindle 32 and a spring 35 connects the two so that when the slides are lowered the spring 35 is further tensioned, the initial tensioning being effected by means of a handwheel attached to an extension of the spindle 32 and controlled by a releasable ratchet and pawl mechanism. The sleeve 31 carries a pair of discs 63 between which is a short pin 65 coacting with a notch 64 in a link 61 pivotally connected with arcuate members 57 carrying a bar 59 which when operated releases the web from the blade 48. In operation the webs 54 with the interleaved carbons 66 are fed between the blade 48 and the flap 51 over the roller 19 to the platen 56. The anchorage 68-71 for the carbon papers is adjusted, so that their leading edges do not quite reach the platen, by means of a handwheel rotating a shaft 76 carrying pulleys 75 having chains 73 which extend over pulleys 74 on the roller shaft 20 and downwardly to the anchorage 68, 71. Rotation of the platen will draw the web through the support until a fold &c. engages the blade 48, the roller 19 and pulleys 74 remaining at the uppermost position. With the web now retained by the blade 48, the roller 19 and pulleys 74-which have until now remained in the uppermost position-now commence to slide downwardly causing clockwise rotation of pulleys 27 and hence movement of pin 65 which causes the bar 59 to contact and release the web from the retaining blade 48. The roller 19 does not rise since it is held down by the chain 73, the anchorage 68-71 and the carbon-papers 66 now held by the platen 56 and friction roll 82. The springs 52 give the web an immediate forward movement preventing re-engagement of the fold with the blade 48. The webs are fed by the platen during typing after which the friction roll 82 is released allowing the assembly of web 54 and carbon papers 66 to return until the carbon papers are released from the platen 56 whereupon the webs are advanced past the platen and torn off. Fine adjustments can be made to the initial position of the carbon papers so that areas between the used portions thereof can be made available. In a modification, Fig. 7 (not shown), the retention and release of the web is effected by a pair of pins 88 on the equivalent of bar 59 which engage corresponding holes adjacent to the tear-off perforations in the web. In a further modification the control of the web is effected by a toothed drum engaging perforations in the edge of the webs the drum having a double notched boss with which co-operates a projection on a lever connected by a link similar to link 61 above. Carbon-paper, maximum wear arrangements. -The whole of the carbon-paper is used by making fractional line-spacing adjustments to the commencing position of the attachment 68- 71 effected by rotation of a hand-wheel attached to the end of the shaft 76.