Patent GB-1088179-A (GB)
Title: Function operating device for an electric typewriter
IPC: B41J25/06
Filed: 1965-08-02
Abstract: 1,088,179. Typewriters. ING. C. OLIVETTI & C. S.p.A. Aug. 2, 1965 [Aug. 1, 1964], No. 32917/65. Heading B6F. An electric typewriter having a transversely movable carriage controlled in letter-space direction by an escapement mechanism, a power-driven carriage return and a tabulating mechanism is provided with a function operating device including a common member 54 operating either the carriage return mechanism or tabulating mechanism at the depression of a carriage return key 32 and tabulating key 104, respectively, the common member 54 being operated by a two-step cyclic cam 11, effecting a first step on the depression of the respective key, control means 86, 102, 103 being provided to cause the cam to effect a second step upon termination of the carriage stroke to restore the common member 54 together with the respectively operated mechanism. Carriage-return mechanism; carriage-return key action; power-assisted key actions.-Depression of carriage-return key 32 and its associated lever 33 rocks lever 43 through lever 41 and link 42 to pivot a further lever 46, Fig. 2 (not shown), to position a nose 52 thereof into the path of lug 53 of the common member 54, Fig. 1, having an arm 57 adapted as a cam follower spring biased into contact with a clutch-operated cam 11 by a spring 58. During the course of depression of the key a pin 38 on the lever 33 rocks a bail 29 which via a link 27 rocks a lever 21 to free a lug 18 of a lever 12 to cause engagement of a clutch 7, 8, which rotates through 90 degrees and becomes thereafter arrested by the arm 103 of lever 12 engaging a lug 102 on lever 99 which is pivoted into the path of the arm 103. During rotation of the clutch through the 90 degrees step the cam 11 rocks the bail 54 whose lug 53 rocks a lever 48 to concomitantly pivot a lever 66 which rocks a bail 86 through lever 68 whose projection 88 by engagement of lug 84 rocks the arm 93 of the bail 86 into engagement with pawl 94 of escapement rack 95 to free the carriage stand to engage a clutch 62, Fig. 2 (not shown), of the carriage return mechanism. Carriage return stroke terminates when projection 77 on counterstop 74 strikes left-hand margin stop 79 whereupon counterstop is displaced against bias of spring 160 to pivot lug 72 of lever 70 to move link 69, Fig. 1, towards the right whereby lever 68 and its associated projection 88 cause the bail 86 to be rocked anticlockwise. Arm 93 releases pawl 94 of escapement rack 95 causing former to engage the latter and lug 96 of bail 86 pivots the lever 99 disengaging arm 103 so that the clutch 7, 8 rotates through 270 degrees restoring common member 54 to its original position when lug 18 of lever 12 re-engages lever 21 associated with the carriage-return key 32, which is released when the clutch 7, 8 has been rotated through its first step of 90 degrees. Tabulating mechanism; power-assisted tabulating by actions.-Depression of tabulating key 104 rocks lever 106 displacing link 109 to pivot lever 116 whose lug is interposed over bail 119. Concomitantly arm 107 rocks bail 29 which causes clutch 7, 8 to be engaged in a manner as described for carriage-return. During the course of movement of the clutch through its first step of 90 degrees, the bail 54 rocks bail 119 through links 125, 123 and pin 122 to pivot a lever 117 anti-clockwise, by lug 127 permitting counterstop 131 mounted in a slide 133 to move upwardly for engagement with displaced tabulating stops 137 when the carriage 81 is moved. Lever 117 also displaces a further lever 146 whose lug 148 displaces lug 149 on the bail 86 to disable the escapement mechanism as during carriage-return described in the preceding paragraph and displaces indirectly the lug 102 of lever 99 into the path of arm 103, which arrests the clutch 7, 8 at the end of its 90 degrees step. Tabulating stroke terminates when tabulating stop 137 engages counterstop 131 displacing its associated slide 133, Fig. 3 (not shown), a projection 140 thereon rocking a lever 141 which pivots the lever 146 so that the lug 148 frees the lug 149 on the bail 86, which is restored its lug 96 disengaging lug 102 from arm 103 whereby the clutch 7, 8 is enabled to rotate through the second step of 270 degrees the cam 11 through cam follower 57 of bail 54 restoring bail 119 disengaging the latter from the lug 118 of lever 117. Reverse tabulating arrangements; combined tabulating and carriage return key power assisted actions.-Reverse tabulation is effected by first depressing the carriage return key 32 and then when the carriage has passed the required column position depressing the tabulating key 104. Depression of key 32 rotates cam 11 through its first step of 90 degrees as described in the paragraph dealing with carriage return i.e. cam 11 is arrested by coaction of arms 103 and lug 102. In this position cam 11 positions lug 152 of link 151 into the path of shoulder 154 of reverse tabulation slide 156. As the tabulating key 104 is depressed whilst the carriage is returning the lever 106 is rocked clockwise to cause lug 158 on slide 156 to displace the lever 99 and break the engagement between arm 103 and lug 102 and clutch 7, 8 is re-engaged causing cam 11 to rotate irrespective of termination of carriage return stroke. Depression of key 104 prevents lever 21 arresting lug 18 of lever 12 hence a new cycle pertaining to carriage tabulation is effected. Carriage is arrested in the column having the first tabulating step stop 137, Fig. 3 (not shown) at right of the counterstop 131. When the key 104 is depressed when the carriage is returning and the counterstop 131 is close to a set stop 137, the latter engages the tapered edge 139, Fig. 3 (not shown), of the counterstop 131 which is temporarily depressed and rendered ineffective. The stop 137 thus passes to the right of the counterstop 131.