Patent GB-1167268-A (GB)
Title: Printing Device for Typewriters, Teleprinters, Accounting and like Machines
IPC: B41J7/62
Filed: 1967-06-05
Abstract: 1,167,268. Typewriters &c. ING. G. OLIVETTI & C. S.p.A. 5 June, 1967 [25 June, 1966], No. 25807/67. Heading B6F. A type carrier for a typewriter, teleprinter, accounting or like machine is positioned to select a particular type for printing by the aggregate rotary movement of a group of eccentrics e.g. eccentrics 35 ... 38, Fig. 2, each settable according to a code unit, by being rotated through 180 degrees by means of a pinion 49 connected thereto, the pinions 49 being coaxial. As shown in Fig. 1 the arrangement is employed to set circumferentially a group of four typewheels 12 mounted on a carriage 20 which is movable for letter spacing along an axially-fixed platen 11. As described later, the set of typewheels is also moved axially relatively to the carriage 20 to bring a selected typewheel to the printing position and in alignment with a printing hammer, this also being effected by the aggregate movement of a group of eccentrics. The outermost eccentric 38 carries a pin 66 engaging a slotted arm 64 fixed to a sleeve 52 rotatable on a shaft 39 extending between the end plates 21, 22 of the carriage 20. A pinion 49 with diametrically opposite parts 51 devoid of teeth is fixed to the sleeve 52. Two diametrically opposite teeth 54, 56 spaced from the pinion 49 are also provided on the sleeve 52. A sleeve similar to the sleeve 52 is also provided on the shaft 39 for each of the other eccentrics 35 . . . 37. A shaft 75, Fig. 2, is mounted on the carriage 20 parallel to the shaft 39 and carries axially movable members 67, one corresponding to each sleeve 52. Each member 67 comprises a narrow pinion 69 and two diametrically-opposite teeth 76. Before a type-setting operation, the toothless parts of the pinions 49 are opposite the pinions 69 and the teeth 54, 56 are axially spaced from the teeth 76. The pinions 69 engage pinions 70 on a sleeve 71 extending between the side plates 21, 22 of the carriage 20 and splined to a motor driven shaft 72 extending across the width of the machine. Each axiallymovable member 67 is associated with a code bar 104 and rocking of selected code bars by signals from a teleprinter or by operation of a key causes, through a lever connection, axial movement of the corresponding members 67. Such movement of a member 67 brings the teeth 76 thereon into alignment with the teeth 54 or 56 of a sleeve such as 52, thus initiating the rotation of the sleeve which rotation is continued for 180 degrees by the engagement of the pinions 49, 69. One or more of the eccentrics are thus rotated through 180 degrees. This causes movement of a connecting rod 41 which through a stirrup 32, racks 26 and pinions 24 effects rotation of the type wheels 12. Each typewheel 12 is rotatable about a pivot 13 mounted on a plate 14, Fig. 1, each plate 14 being slidable towards and away from the platen 11 by the engagement of slots therein with two hollow square bars 16 themselves slidable axially along bars 23 fixed to the carriage end plates 21, 22. The bars 16 have projections engaging the plates 14 so that the plates move parallel to the platen with the bars 16. Also, the bars 16 are attached to two flank plates 18, 19, and the plate 19 has a hooked extension (89, Fig. 3) engaged by a stirrup (84) which is movable by a two-eccentric arrangement similar to the eccentrics 35 . . . 38 when one or the other or both eccentrics are coupled to the rotating sleeve 71. Thus a selected type is brought to the printing point, at which point a notch 126 on the corresponding plate 14 is aligned with a printing hammer 125. Type alignment.-After type selection has been effected, a code bar 119, Fig. 1, operates a lever 114 to cause endwise movement of a gear device 110 which causes a pinion 107 on a shaft 108 to be driven from a gear 70 on the rotating sleeve 71. A cam 120 on the shaft 108 controls the initial movement, under the action of a spring 121, of a bail 123 of which the hammer 125 is a part. The corresponding initial movement of the selected plate 14 frees a spring- urged lever (151, Fig. 4) thereon from a stop rod (153), and the lever 151 moves so that a projection 154 engages internal teeth on the typewheel to align the wheel. Another cam 156 on the shaft 108 operates a linkage 157 . . . 160 to move a projection into engagement with a notch 162 on one of the bars 16 to effect axial alignment of the selected typewheel 12. Hammer impression arrangements.-After the initial movement of the hammer 125 (see preceding paragraph), a part 137 on the bail 123 engages a cam 138 on the shaft 108 so that subsequent forward movement is controlled by the cam 138. This cam has three differently-shaped edges either of which can be operative on the part 137 by adjusting the cam 138 axially of the shaft 108 according to the speed of telegraphic code transmission. As the type nears the platen 11, an arm on the bail 123 engages a pin 141 on a lever 142 having an adjustable spring 143 attached thereto, the spring causing the plate 14 and typewheel to be retarded during the latter part of their movement. Also, the hammer 125 has some play in the notch 126 so that the final part of the movement takes place under the inertia of the plate 14 &c. The hammer 125 normally engages a notch 127 in a bar 128 pivoted about a shaft 124 and urged by springs 131 against abutments 136 on the carriage end plates 21, 22. A projection 132 on the hammer 125 enters a hole 133 in the bar 128. The notches 126 in the plates 14 engage the bar 128. During printing movement of the hammer 125, the bar 128 follows the hammer until the abutments 136 stop its movement, all the plates 14 moving with the bar. Subsequently the hammer moves independently as described above to effect printing from the selected typewheel.