US3441119A - Pawl release mechanism - Google Patents

Pawl release mechanism Download PDF

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Publication number
US3441119A
US3441119A US552841A US3441119DA US3441119A US 3441119 A US3441119 A US 3441119A US 552841 A US552841 A US 552841A US 3441119D A US3441119D A US 3441119DA US 3441119 A US3441119 A US 3441119A
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carriage
pawl
movement
pawls
control means
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US552841A
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English (en)
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Horst Schweizer
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Olympia Werke AG
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Olympia Werke AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/54—Locking devices applied to printing mechanisms
    • B41J29/58—Locking devices applied to printing mechanisms and automatically actuated
    • B41J29/70—Interlocks between any two-carriage-moving mechanisms, e.g. character-space, back space, tabulation, carriage return or carriage- release mechanisms

Definitions

  • PAWL RELEASE MECHANISM Filed May 25, 1966 Sheet 13 of 5 ATTORNEY H. S'CHWEIZER
  • PAWL RELEASE MECHANISM A ril 29, 1969 Sheet 3 of 3 Filed May 25, 1966 INVENTOR ATTORNEY United States Patent 3,441,119
  • the present invention relates to a pawl release mechanism for the paper carriage of a typewriter and more particularly, to a pawl release mechanism which cooperates with an escapement mechanism for moving the paper carriage in steps which are proportional to the dimensions of the typed characters.
  • the escapement mechanism includes escapement pawls which are mounted for turning and translatory movement and are spring-biased to cooperate with a rack secured to the paper carriage. During a tabulating operation, or when release of the carriage by the escapement pawls is desired, the escapement pawls are retracted from the rack of the paper carriage.
  • the escapement pawls are aligned and are, after moving a short distance with the returned paper carriage, moved out of engagement with the rack of the paper carriage, and then automatically locked so that the carriage can continue its return movement without being impeded by the escapement pawls. After this movement of the pawls in rearward carriage return direction, they are again moved forward when the return movement is interrupted so that the pap-er carriage is stopped after moving forward from the end position a distance corresponding to the spacing of the rack teeth, although the pawls are arranged to move a greater distance during normal escapement functions.
  • Another object of the invention is to use control means which are operable to move the pawls to a releasing position, and hold the pawls in the releasing position during a carriage return movement.
  • Another object of the invention is to automatically lock the control means in the position holding the pawls in the releasing position, until return movement of the carriage is terminated, and a movement in the writing direction starts.
  • Another object of the invention is to provide margin control means which effect the stopping of the carriage in desired end positions.
  • the present invention relates to an escapement mechanism for a carriage movable in a forward direction and in a rearward return direction, and having a rack with teeth and recesses.
  • One embodiment of the invention comprises escape ment pawl means having a releasing position, and an en gaging position engaging the rack for blocking carriage movement in the forward direction; biassing means for urging the pawl means to move in the rearward direction, and also to the engaging position; control means, prefer- 3,441,119 Patented Apr. 29, 1969 "ice ably mounted for angular and translatory movement from a normal position to an operative position for moving the pawl means to the releasing position and for holding the same in this position; and locking means movable between an inoperative position and a locking position for locking the control means in the operative position.
  • the pawl means move at first in the engaging position with the carriage until they are stopped by the control means in the normal position, moved by the rack to the releasing position, and then move the control means by frictional engagement to the operative position so that the pawl means are held in the releasing position.
  • the locking means are frictionally coupled with the carriage to be moved at the beginning of the carriage return movement to the locking position for locking the control means in the operative position whereby the pawl means are held in the releasing position during the carriage return movement, and cannot engage the rack of the carriage.
  • the locking means are frictionally moved back to an inoperative position so that the control means is returned by biassing means to the normal position, permitting the pawl means to move to the engaging position to block carriage movement in the forward direction.
  • Margin end stops are provided on the carriage, and cooperate with margin control means which move the control means out of locking engagement with the locking means when displaced by a margin end stop at the end of a carriage return movement.
  • the control means When the control means is released from the locking means it returns to its normal position so that the pawl means are free to move to a position engaging the rack and blocking carriage movement.
  • the excess movement of the paper carriage beyond its end position is used for driving the control means to move the pawl means in the writing direction so that the pawl means fall into the recess of the rack trailing less than the distance between adjacent rack teeth in respect to the blocking position. In this manner the necessary excess movement of the paper carriage is reduced.
  • FIG. la is a fragmentary front view illustrating an embodiment of a pawl release mechanism according to the invention, and also showing parts of an escapement mechanism and of a back spacing mechanism, FIG. 1a being partially in section along the lines C-D in FIG. 1b;
  • FIG. lb is a plan view of the embodiment of FIG. 1a;
  • FIG. 2 is a fragmentary elevation, partially in section, illustrating a pawl release mechanism in an operational position assumed during the carriage return movement, omitting the parts of the escapement mechanism and back spacing mechanism;
  • FIG. 3 is an elevation, partially in section, illustrating the pawl release mechanism in another operational position assumed at the end of a carriage return movement.
  • the paper carriage of a typewriter carries the escapement rack 1, and is urged by a carriage spring, not shown, to move in a forward writing direction indicated by the arrow 2.
  • a carriage spring not shown
  • the carriage with rack 1 moves in the opposite rearward direction.
  • An escapement mechanism P includes pawl means, shown to be a set of three pawls 4 whose engaging portions cooperate with the recesses between teeth 3 of rack 1.
  • the pawls 4 are operated in a manner which is not an object of the present invention to permit the carriage to move steps of different length proportionate to the dimensions of a typed character, the steps having a length of one, two or three distances e.
  • the set of escapement pawls 4 is mounted on a stationary rod 7 for turning movement into and out of the recesses between teeth 3, and for movement in the direction of rack 1 and of the carriage movement.
  • Pawls 4 have slots 6 open at one end and closed at the other end by semi-circular stop portions 6', which are spaced different distances L L L from the tip of the respective engaging portion 5, and since the pawls 4 are of corresponding lengths, the foremost pawl 4 is the longest, and the rearmost pawl 4 is the shortest.
  • Distance L +e is distance L and distance L is distance L +e, as diagrammatically indicated in the upper portion of FIG. 1a.
  • FIG. 1a shows the foremost longest pawl 4 in dash-dot lines.
  • Each of the pawls 4 is biassed by a spring 8 engaging an arm 9 thereof to turn in counterclockwise direction about rod 7 to an engaging position in which engaging portion 5 is located in a recess of rack 1, but springs 8 also urge pawls 4 to move in rearward direction along rack 1.
  • FIG. 1a shows the engaging portions 5 of all three pawls 4 located in the same recess between adjacent teeth 3 of rack 1, abutting tooth 3 under the action of the carriage spring which urges rack 1 in the direction of the arrow 2. Consequently, the flank of tooth 3 urges all three pawls 4 toward the left, overcoming the weaker springs 8, so that the longest pawl 4 abuts with its stop portion 6' on rod 7, which blocks carriage movement, while stop portions 6' of the shorter rearward pawls 4 are spaced from blocking rod 7 the distances e and 22, respectively, while only the foremost pawl blocks movement of the carriage in forward direction together with blocking rod 7.
  • the position of pawls 4 shown in FIG. 1a in which all engaging portions 5 are located in the same recess, is a basic position, but other positions can be assumed by the pawls 4 in which the respective stop portion 6 of another pawl 4 abuts blocking rod 7 and in which different engaging portions are located in adjacent recesses between rack teeth 3.
  • Each pawl 4 has a projecting lug 10 shown in FIG. 1a.
  • Lugs 10 have shoulders 10 spaced from each other distances e so that each shoulder 10' is spaced the same distance from the respective stop portions 6'. Each shoulder cooperates with engaging edges 11', 11'a of pairs of releasing members 11, 11a, one pair of releasing members 11, 11a being respectively associated with each pawl 4.
  • Releasing members 11, 11a have slots 12 open to the right as viewed in FIG. la, and embracing rod 7 so that the releasing members 11, 11a are guided for longitudinal and turning movement.
  • Springs 13 and 13a are respectively connected with each pair of releasing members 11, 11a and urge the same to turn in counterclockwise direction until a stop 14 abuts a stationary abutment 15, schematically indicated in FIG. 1a and preferably mounted on the frame 50 of the machine.
  • the action of 4 springs 13, 13a urges releasing members 11, 11a to the right until edges 1.1, 11'a abut shoulders 10' of lugs 10 of pawls 4.
  • Each releasing member 11, 1111a has a projecting portion 16, 16a, of which portions 16 and 16a of the second releasing member are shown in FIG. la.
  • Projecting portions 16, 16a project over the respective lug 10 of the associated pawl 4.
  • Projecting portion 16 of each releasing member 11 projects over the respective lug 10 substantially the distance e so that when releasing member 11 turns in clockwise direction, engagement of lug 10 is assured.
  • Projection 16a of each releasing member 11a is a distance 1 longer than projection 16, the distance r being the spacing between adjacent teeth 3.
  • Each projection lea has consequently a length of t+e.
  • the above described parts belong to an escapement mechanism P whose escapement pawls 4 effect proportionate spacing between typed characters having different dimensions.
  • the escapement mechanism, P is not an object of the present invention, but the pawl release mechanism of the invention makes use of pawls 4 and of projecting lugs 10.
  • a back spacing mechanism S is partly illustrated in FIG. 1a and includes a member 52 mounted on a stationary shaft 53 supported on frame 50 and being tiltable about shaft 53 together with a pin 43 carried by arms of member 52. Coupling levers have forked ends embracing pin 43.
  • a drive means 36 is mounted ona shaft 38 and has a part 39 abutting an abutment under the action of springs 42.
  • a back spacing means 41 embraces part 39 so that upon operation of the back spacing means 41, drive means 36 is turned. Coupling portions 35' cooperate with cut-outs 45 in pawls 4.
  • the back spacing mechanism S with member 52 is not an object of the present invention.
  • the above mentioned springs 8 connect pawls 4 with member 52 and hold the same in the illustrated position. Parts of the escapement mechanism P and of the back spacing mechanism S which have no bearing on the present invention, are omitted in FIGS. 2 and 3.
  • Lugs 10 have, in addition to the staggered shoulders 10, also shoulders 10 which are spaced equal distances from the respective tips of engaging portions 5, so that shoulders 10- are aligned in the position of FIG. 1a in which all three engaging portions 5 of pawls 4 are located in the same recess of rack 1.
  • a substantially U-shaped control means 54 has a pair of arms 54", 54 connected by a bar 54a having an edge 54 located opposite the aligned shoulders 10", and another edge 54b.
  • aligned shoulders 10" are spaced from edge 54 a distance which is substantially 2t, that is twice the spacing between adjacent recesses of rack 1.
  • Arms 54", 54" of control means 54 are respectively mounted for turning movement with bar 54a about a pair of journals 55, 55a inwardly projecting from the arms 57, 57" of a carrier 57 which is mounted for rocking movement about shaft 43 which connects the arms of the U- shaped member 52.
  • member 52 and shaft 43 are immovably held by springs 8, and also by a spring 56 connecting member 52 with arm 54' of control means 54.
  • the other arm 54" of control means 54 projects beyond the axis formed by journals 55, 55:: into the region of shaft 43 on which carrier 57 is supported for angular movement. Since spring 56 is connected to arm 54" spaced from the axis 55, 55a, control means 54 is biassed to turn in clockwise direction until arm 54 abuts a stop 58 which is secured to frame 50, as best seen in FIG. 1b.
  • a spring 49 which is connected with an arm of carrier 57 and with a locking bail 48, which locks releasing members 11, 1111 by engaging teeth 30, has the same effect so that carrier 57 is resiliently held in a normal position in which its arm 57" abuts shaft 53.
  • Member 52 is held by springs 56 and 8 in a position in which shaft 43 abuts a fixed abutment 50" schematically shown in FIG. 1a, and provided on a wall of the frame 50, as shown in FIG. 1b. Consequently, shaft 43 is immovable during turning movement of carrier 57 during carriage return operations. A turning of member 52 about shaft 53 takes place only during back spacing operations by mechanism S, which is not an object of the present invention.
  • Carrier 57 has a projecting pin 55" cooperating with a projecting abutment 59 of a slide 59 which rests on pin 55'', and is biassed upward by a spring 59s.
  • Slide 59 is guided behind wall 50 for vertical movement and has a slotted end on which the standard carriage release rod 590 acts, when manually operated by pressure on the ends of the release rod 590 projecting from the carriage end walls.
  • Carrier 57 has another projecting pin 55 embraced by the fork-shaped end portion of another slide 60 which is controlled by the tabulator key, not shown. By operation of slide 59 or slide 60, carrier 57 is turned for effecting a release of the carriage by the escapement mechanism, and more particularly by pawls 4.
  • control means 54 When carrier 57 is further turned in counterclockwise direction by operation of members 59 or 60', control means 54 is turned in counterclockwise direction since its arm 54" abuts guide shaft 43. Bar 54a engages arms 9 of pawls 4, and turns pawls -4 to a position in which engaging portions 5 release rack teeth 3. The released carriage is moved by the carriage spring in the writing and tabulating direction indicated by arrow 2.
  • the above described mechanism is not only used for releasing the carriage for tabulating movement and for fast movement in the writing direction, but also for the carriage return during which the carriage with rack bar 1 is moved either manually or by a motor towards the right as viewed in the drawing in a carriage return direction.
  • pawls 4 are at first taken along by the carriage and rack teeth 3 until shoulders 10" abut control edge 54'.
  • the force exerted by the carriage on pawls 4 urges lugs 10 against control edge 54' and bar 54 while pawls 4 turn about rod 7 in clockwise direction until engaging portions 5 release the recesses of the rack teeth 3.
  • shoulders 10 are in frictional engagement with edge 54 which forces bar 54a downward, and turn control means 54 in counterclockwise direction about journals 55, a to the position shown in FIG. 2 in which the tips of engaging portions 5 are located on the tip of the next following tooth of rack 1.
  • a bail 48 cooperates with releasing members 11, 11a.
  • Locking means are provided to hold the pawls 4 in the releasing position during the continued carriage return movement.
  • a U-shaped coupling means 62 consisting of highly resilient steel is mounted for angular movement.
  • the legs 62 resiliently and frictionally engage the sides of rack bar 1 so that the upper ends of arms 62' are coupled with and taken along by the carriage.
  • One of legs 62 is connected with a locking member 63 having two angularly spaced arms 63 and 63" located on opposite sides of the stationary stop 58.
  • rack bar 1 acts on coupling means 62 to turn the same until a locking portion 63 of locking member 63 abuts edge 54b of control bar 54a.
  • portions 5 are pushed out of the respective recess of rack 1, as explained above, permitting lugs 10 to engage control edge 54' of bar 5411 and to turn control means 54 to the position shown in FIG. 2 in which edge 54b is moved below the locking portion 63 of locking means 63 so that the friction force still acting on coupling means 62 turns locking means 63, 62 to the position illustrated in FIG. 2 in which arm 63 abuts stop 58 so that rack bar 1 slides on legs 62' during the continued return movement of the carriage.
  • locking portion 63 locks through control bar 54a pawls 4 in the releasing position illustrated in FIG. 2 so that the carriage return movement is in no way impeded.
  • control bar 54a Since the end face of locking portion 63 is not concentric with the turning axis 61 of locking means 62, 63, control bar 54a is forced down by the cam action of the end face of locking portion 63'". Therefore, control means 54 may be locked by locking portion 63" before arm 63" abuts stop 58.
  • rack bar 1 turns locking means 62, 63 in counterclockwise direction until arm 63" abuts stop 58.
  • Locking portion 63" releases edge 54b of control bar 54a, so that spring 56 turns control means 54 in clockwise direction to the normal position of FIG. 1a in which control means 54 abuts stop 58, as shown in FIG. 1a.
  • Control bar 54 releases arms 9 of pawls 4 so that the pawls 4 are turned by springs 8 in counterclockwise direction and engaging portions 5 fall into the next approaching recess of rack 1.
  • the pawls 4 are thus coupled to the carriage which moves in writing direction, and are moved in the same direction until the longest pawl 4 abuts with its stop portion 6' on rod 7, while lugs 10 separate from control edge 54' of control bar 54.
  • the distance of movement of pawls 4 from control edge 54' to the position in which the longest pawl 4 abuts rod 7 is at least as long as required for the longest arresting step of pawls 4, which is in the present case six distances 2, or two distances 2.
  • Margin control means 65 is an angular lever mounted for angular movement about pivot pin 58 which also cooperates with locking means 63 and control means 54, as described above.
  • a strong spring 66 biases margin control lever 65 to turn in counterclockwise direction to the position shown in chain lines in FIG. 3 in which arm 65 abuts the stationary shaft 53. Arm 65' projects across journal pin 55 of carrier 57.
  • Margin control means 65, and left and right end stops 64 and 67 are illustrated in a simplified manner as regards the spacial arrangement, but sufficient to fully understand the function of this mechanism.
  • Known and conventional devices such as shock absorbers, particularly for dampening the impact on the end stop 67, are omitted for the sake of simplicity.
  • margin stop 64 engages and turns margin control lever 65 in clockwise direction so that arm 65' moves away from shaft 53 and engages journal pin 55 to turn carrier 57 in counterclockwise direction about shaft 43 so that control means 54 is displaced to the left, as explained above, and moves the pawls 4 to the left in the writing direction a distance 1.
  • edge 54b of control bar 54a slides off the end face of stop portion 63 and separates from the same.
  • edge 54b of control bar 54a slides off the end face of stop portion 63 and separates from the same.
  • margin stop 64 On margin control lever 65, the same is turned against the action of Spring 66 an angular distance proportionate to the impact force and carrier 57 is turned a corresponding angle for moving control bar 54a a corresponding distance to the left.
  • the displaced positions of margin control lever 65 and carrier 57 are shown in FIG. 3 in solid lines.
  • Friction coupling 62, 62 is turned in counterclockwise direction as viewed in FIG. 2 and moves locking portion 63" away from control bar 54a.
  • Margin stop lever 65 has already started its counterclockwise movement under the action of spring 66 so that carrier 57 turns in clockwise direction and moves control means 54 to the right permitting engaging portions of pawls 4 to move toward rack 1, while still abutting control edge 54 of control bar 54a.
  • the longest pawl 4 should be spaced a certain distance to the blocking position abutting blocking rod 7. This distance must be smaller than the still present portion of the excess distance moved by margin stop 64 beyond the desired line start position so that a certain play for engaging portions 5 permits the falling of the same into the recess corresponding to the desired line start position.
  • a pawl release mechanism for a carriage movable in a forward direction and in a rearward return direction, and having a rack bar with teeth and recesses comprising, in combination, escapement pawl means having a releasing position, and an engaging position located in at least one of said recesses cooperating with said rack bar for blocking carriage movement in said forward direction; biassing means for urging said pawl means to move in said rearward direction, and also to said engaging position; control means movable from a normal position to an operative position for moving said pawl means to said releasing position, and holding in said operative position said pawl means in said releasing position, said control means in said normal position being engaged by said pawl means moving in said return direction in said engaging position with said carriage at the beginning of a carriage return movement in said rearward return direction so that said pawl means are stopped by said control means in said normal position and are cammed toward said releasing position by said rack bar during continued movement of said carriage so as to move by frictional engagement said control means to said operative
  • said csacpement pawl means include a plurality of pawls of different length, said pawls having control shoulders aligned when said pawls engage the same recess; including a carrier mounted for turning movement, and supporting said control means for turning and translatory movement; said control means having a control edge extending across said control shoulders spaced the same distance from the same, and a control bar crossing said pawls and moving the same from said engaging position to said releasing position during movement of said control means from said normal position to said operative position; and including manually operated means for moving said carrier so that said control means is moved from said normal position to said operative position.
  • a pawl release mechanism according to claim 2, wherein said coupling means frictionally engages said rack bar and being mounted -for turning movement between two end positions, and a locking portion cooperating with said control bar to engage and lock the same in said operative position when said coupling means is turned by said rack bar to one of said end positions at the beginning of a carriage return movement, and to unlock and release said control bar when said coupling means is turned to the other end position during movement of said rack bar in the forward writing direction.
  • a pawl release mechanism according to claim 3 wherein said locking portion is a cam exerting an in creasing pressure on said control bar during turning movement of said coupling means to said one end position.
  • a pawl release mechanism including a stop; wherein said control means is guided along said stop for translatory movement in said writing direction for movement to a position in which said control edge engages said control shoulders of said pawls; and wherein said locking means has a pair of arms respectively engaging said stop in said end positions of said locking means so that said coupling means is blocked and said rack bar slides on said coupling means during further movement of said carriage after said locking means is blocked against turning movement by said stop in one of said end positions.
  • a pawl release mechanism as claimed in claim 1 comprising pivoted carrier means supporting said control means for movement between said normal and operative positions; and manually operated means connected with said carrier means for turning the same for moving said control means to said operative position.
  • a pawl release mechanism including at least one end stop of said carriage; and margin control means having an inoperative position, and an operative position for moving said control means in said operative position out of locking engagement with said locking means in said locking position so that said control means returns to said normal position whereby said pawl means are free to be moved by said biasing means to said engaging position for blocking carriage movement.
  • a pawl release mechanism according to claim 7, wherein said margin control means is mounted for turning movement and is angularly displaced to said operative position when engaging said end stop at the end of a carriage return movement; wherein said margin control means in said angularly displaced operative position engages said carrier means to turn the same for moving said control means to said operative position; andincluding spring means acting on said margin control means for urging the same to said inoperative position upon separation of said margin control means from said end stop.
  • a pawl release mechanism wherein said pawl means have a control shoulder located opposite said control means; and wherein said turned carrier means moves said control means in a translatory movement in said forward direction to engage said shoulder for moving said pawl means in said forward direction so that said pawl means when released by said control means in said operative position moves a distance less than the spacing between two recesses of said rack before engaging a recess for stopping said carriage.
  • a pawl release mechanism including resilient means for returning said margin control means from said operative position to said inoperative position when said carriage starts movement in said forward direction after a carriage return movement; and wherein said margin control means is operatively connected with said control means for moving the same in said forward direction into engagement with said pawl means whereby the latter are shifted in said forward direction to a position spaced less than the distance between two adjacent teeth from a blocking position of said pawl means; and including blocking means for blocking said pawl means in said blocking position.
  • a pawl release mechanism as claimed in claim 1 comprising pivotally mounted carrier means supporting said control means for pivotal movement; first means for guiding said control means so that the same moves during turning of said carrier means in a rectilinear movement toward said pawl means, and second means for then turning said control means to said operative position for moving said pawl means to said releasing position so that said carriage is free to move in said forward direction; and means operated during tabulation connected with said carrier means for turning the same so as to cause movement of said control means to said operative position.

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US552841A 1965-05-25 1966-05-25 Pawl release mechanism Expired - Lifetime US3441119A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752289A (en) * 1969-12-31 1973-08-14 Triumph Werke Nuernberg Ag Typewriter escapement and control devices therefor
US3757923A (en) * 1971-06-25 1973-09-11 P Kosters Silencer for eliminating noise caused by a pawl on a gear rack when the gear rack is returned to a initial position
US3777870A (en) * 1970-09-16 1973-12-11 Olympia Werke Ag Escapement controlling tabulating apparatus
US3978961A (en) * 1975-04-21 1976-09-07 Western Stamping Corporation Typewriter carriage actuating mechanism
US3985220A (en) * 1970-10-23 1976-10-12 Olympia Werke Kg Tabulator apparatus for a typewriter carriage moving in steps of different length
US4344714A (en) * 1978-02-07 1982-08-17 Hermes Precisa International S.A. Device for positioning the beginning of a line in a typewriter

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US555594A (en) * 1896-03-03 Type-writing machine
US2547449A (en) * 1948-07-08 1951-04-03 Ibm Proportional spacing mechanism for typewriters
US2753973A (en) * 1953-03-12 1956-07-10 Ibm Justifier for typewriters
US2818154A (en) * 1954-11-29 1957-12-31 Underwood Corp Proportional letter feed mechanism for typewriting machines
US2818959A (en) * 1954-11-19 1958-01-07 Ibm Pawl control
US2862595A (en) * 1954-10-18 1958-12-02 Underwood Corp Proportional letter-feed mechanism for typewriters or the like
US2905303A (en) * 1955-12-29 1959-09-22 Ibm Escapement pawl control
US2972401A (en) * 1958-07-26 1961-02-21 Olivetti & Co Spa Variable spacing mechanism for typewriters
US3288262A (en) * 1962-11-08 1966-11-29 Olivetti & Co Spa Variable spacing mechanism for typewriters and like machines
US3288263A (en) * 1963-02-07 1966-11-29 Olivetti & Co Spa Carriage long run controlling device for typewriters and like machines

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US474937A (en) * 1892-05-17 Type weiting machine
US555594A (en) * 1896-03-03 Type-writing machine
US2547449A (en) * 1948-07-08 1951-04-03 Ibm Proportional spacing mechanism for typewriters
US2753973A (en) * 1953-03-12 1956-07-10 Ibm Justifier for typewriters
US2862595A (en) * 1954-10-18 1958-12-02 Underwood Corp Proportional letter-feed mechanism for typewriters or the like
US2818959A (en) * 1954-11-19 1958-01-07 Ibm Pawl control
US2818154A (en) * 1954-11-29 1957-12-31 Underwood Corp Proportional letter feed mechanism for typewriting machines
US2905303A (en) * 1955-12-29 1959-09-22 Ibm Escapement pawl control
US2972401A (en) * 1958-07-26 1961-02-21 Olivetti & Co Spa Variable spacing mechanism for typewriters
US3288262A (en) * 1962-11-08 1966-11-29 Olivetti & Co Spa Variable spacing mechanism for typewriters and like machines
US3288263A (en) * 1963-02-07 1966-11-29 Olivetti & Co Spa Carriage long run controlling device for typewriters and like machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752289A (en) * 1969-12-31 1973-08-14 Triumph Werke Nuernberg Ag Typewriter escapement and control devices therefor
US3777870A (en) * 1970-09-16 1973-12-11 Olympia Werke Ag Escapement controlling tabulating apparatus
US3985220A (en) * 1970-10-23 1976-10-12 Olympia Werke Kg Tabulator apparatus for a typewriter carriage moving in steps of different length
US3757923A (en) * 1971-06-25 1973-09-11 P Kosters Silencer for eliminating noise caused by a pawl on a gear rack when the gear rack is returned to a initial position
US3978961A (en) * 1975-04-21 1976-09-07 Western Stamping Corporation Typewriter carriage actuating mechanism
US4344714A (en) * 1978-02-07 1982-08-17 Hermes Precisa International S.A. Device for positioning the beginning of a line in a typewriter

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DE1436699B2 (de) 1971-04-01
GB1153522A (en) 1969-05-29
NL6607141A (de) 1966-11-28
DE1436699A1 (de) 1969-03-20
CH446404A (de) 1967-11-15

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