Patent GB-1218266-A (GB)
Title: Ribbon vibrating device in type bar typewriters
Inventor: ALBRILE WALTER
IPC: B41J35/12
Filed: 1968-10-09
Abstract: 1,218,266. Typewriters; ink-ribbon mechanisms. ING. C. OLIVETTI & C., S.p.A. 9 Oct., 1968 [14 Oct., 1967], No. 47923/68. Heading B6F. In a type bar typewriter, wherein the ribbon is guided to the printing point by a ribbon vibrator 25 operated with each operation of a type bar, there is provided means for alternately producing a high lift and a low lift of the vibrator 25 to alternately bring two different tracks to the printing point, and a member rendered effective when the case shift device selects the upper characters of the type bars, for reducing the lift of the vibrator in those alternate operations producing a high lift, so as to bring a third, intermediate ribbon track to the printing point, instead of the lower of the two tracks. Power case shifting mechanism, Fig. 1.-The usual curved rod 7 on a conventional type bar segment 6 pivotally supports the type bars 8. A power operable case shift device comprises a shaft 13 with an eccentric 14 adapted to be rotated 180 degrees in response to a case shift key (not illustrated). The eccentric 14 controls a connecting rod 16 pivoted to an arm 18 fast on a shaft 19. Spaced, parallel arms 20 secured to the shaft 19 are pivoted to the segment 6 which has a downreaching member 22 connected to a leaf spring 23 extending from a machine frame portion 24.  Ribbon feed, Fig. 2.-The ribbon is supplied to the vibrator 25 from a supply spool (not illustrated), and is received by a take-up spool 28 carried on a spindle 29 rotatable with a disc 31 which has a driving pin 32 engaging a hole in the spool. A pulley drive 34, 37, 36 connects the spool with a ratchet-wheel 46, the pawl 47 of which is stepped by a cam 60 via levers 56, 52 and 49 (Fig. 5). A pinion 41 fast with the ratchet wheel 46 meshes with a pinion 42 fast on the shaft 43 of a ribbon feed roller 44, which has a pressure roller (not illustrated) co-operating therewith. The cam 60 and another cam 80 are normally stationary on a constantly power rotated shaft 61. 120 degrees cyclic steps are imparted to the cams 60 and 80 through the closure of a normally open clutch (Fig. 7) fast on the shaft 61. Varying throw vibrator mechanism, Figs. 2 and 3.-The vibrator 25 is connected at 73 to a spring-loaded lever 72 pivoted at 58. A pin 74 on the lever 72 engages an extension 77 of a lever 75 pivoted at 76. Before each typing operation, one of three lobes on the cam 80 holds the lever 75 against the tension of a spring 79, and therefore blocks the ribbon vibrator 25 against upward movement. Once the cam 80 releases the lever 75, the high and low lift of the vibrator is governed by a projection 71 on lever 72 engaging respectively a fixed lug 81 or a lug 69 movable into and out of the path of the projection 71. Movement of lug 69 is governed by a square toothed wheel 62 fast with the ratchet wheel 46, and having only half as many teeth. A lever 63, Fig. 2, pivoted at 64, is urged by a spring 68 to enter the voids between the teeth of the wheel 62. Alternate steps of the ratchet 46 causes a clockwise displacement of the lever 63, which displacement is transmitted by a link 65 to a lever 66 pivoted at 67. The lever 67 carries the lug 69 which moves into the path of the projection 71 of the vibrator means. When an upper case character is selected, a lug 97, Fig. 3, on a spring-loaded lever 96 pivoted at 67, is moved from the full line position to the broken line position in front of lug 81. The projection 71 of the vibrator means will therefore be stopped at an intermediate position, defining a third track on the ribbon, instead of the high lift position. An arm 108 fast on the shaft 19 of the ease shift mechanism controls the lever 96 through a projection 99 on a link 101 underlying an ear 98 on the lever 96. Stencil cutting. Fig. 2.-A control lever 86 pivoted at 87 has a pin 88 engaging a notched, spring urged, detent member 89. An arm 85 of a lever 82 has a pin and slot connection with the lever 86. Movement of the lever 86 to the broken line position moves an extending stop member 84 on the lever 82 into the path of the projection 71 of the vibrator means, thereby preventing movement thereof. In addition, an upreaching arm 91 of the lever 82 moves a slide 92, Fig. 2 and (Fig. 5) so that its edge (94) holds the feed pawl 47 clear of the ratchet-wheel 46 so that no ribbon feed occurs during stencil cutting.