US3358806A - Escapement mechanism for typewriters - Google Patents

Escapement mechanism for typewriters Download PDF

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Publication number
US3358806A
US3358806A US346716A US34671664A US3358806A US 3358806 A US3358806 A US 3358806A US 346716 A US346716 A US 346716A US 34671664 A US34671664 A US 34671664A US 3358806 A US3358806 A US 3358806A
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Prior art keywords
escapement
carriage
movement
support
lever
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Expired - Lifetime
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US346716A
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English (en)
Inventor
Krauss Otto
Decker Herbert
Link Manfred
Stuiber Walter
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TA Triumph Adler GmbH
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Triumph Werke Nuernberg AG
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Assigned to TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INFORMATIONSTECHNIK reassignment TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INFORMATIONSTECHNIK CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE 8/13/80 Assignors: TRIUMPH WERKE NURNBERG AKTIENGESELLSCHAFT
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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/34—Escapement-feed character-spacing mechanisms
    • B41J19/58—Differential or variable-spacing arrangements
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/34—Escapement-feed character-spacing mechanisms
    • B41J19/40—Escapements having a single pawl or like detent
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/66—Carriage-release mechanisms

Definitions

  • the present invention relates to an escapement mechanism for a typewriter or similar business machine including a stepwise movable carriage.
  • Escapement mechanism of this type must be constructed lin such a manner that the carriage moves rapidly one step after each type bar actuation, and is also very rapidly stopped without a bouncing movement. Such bouncing movement upon engagement between the carriage rack and the escapement pawl may cause the printing of characters in displaced positions so that the appearance of the typewritten script is inferior.
  • Escapement mechanism in which the escapement pawl is moved in a direction opposite to the carriage movement to engage the carriage rack before the carriage has completed one step.
  • Escapement pawls of this type are mounted for turning and translatory movement on pins passing through elongated slots in the escapement pawl.
  • this type of mounting does not permit a precise positioning of the escapement pawl, and the pawl is also subjected to very great wear.
  • the escapement mechanism must have a very rigid construction, since the'rapidly moving carriage must be stopped quickly in spite yof its great inertia.
  • resilient means in order to stop the carriage faster after a step, and to reduce the impact on the escapement pawl.
  • Such resilient means reduce the hard impact of the carriage on the escapement pawl, but it can be used for a limited time only since due to the heavy wear, the dampening characteristics are lost.
  • Another object of the invention is to provide an escapement mechanism comprising two connected members movable in transverse directions so that the escapement pawl need not be mounted for movement intwo directions.
  • Another object of the invention is to damp the carriage movement by non-resilient damping means which consume the energy of the inertia of the moving carriage before the same is stopped by the escapement mechanism.
  • Another object of the invention is to provide an escapement mechanism which produces very little noise.
  • Another object of the invention is to provide an escapement mechanism which operates so rapidly that the type actions can be operated in very rapid succession.
  • Another object of the present invention is to provide an escapement mechanism which can be set to automatic double spacing.
  • Another object of the invention is to provide an escapement mechanism which is rendered inoperative during operation of the back spacing device or of the tabulating device of a typewriter.
  • the present invention provides an escapement mechanism for the carriage of a Patented Dec. 19, 1967 typewriter.
  • One embodiment of the invention comprises a support reciprocable along the rack of the carriage; an escapement member mounted on the support for movement between a rack engaging position and a releasing position, and for movement with the support between a plurality of positions cooperating with different teeth of the rack.
  • Biasing means urge the support to move opposite to the direction of carriage movement, and urge the escapement member to move to the position engaging the rack of the carriage.
  • the escapement member is moved to the releasing position, and the support moves with the escapement member opposite to the direction of carriage movement whereupon the escapement member engages the rack of the carriage before the same starts its stepwise movement.
  • the escapement member and the support move together with the carriage until the support of the escapement member engages a stop which brings the support with the escapement member, and the carriage to a standstill.
  • Control stop means are provided for limiting movement of the support in the opposite direction, and such control stop means can be set to two different positions so that the escapement member moves either one step or two steps opposite to the direction of the carriage movement, and then moves with the carriage corresponding distances so that by adjustment of the control stop means the mechanism can be set to a condition in which the carriage performs single steps, and another condition in which the carriage performs double steps, as is desirable for typing spaced letters.
  • damping means are provided for reducing the speed of the carriage before the same is stopped.
  • damping means are preferably pneumatic means which consume the energy of the inertia of the carriage by transforming the kinetic energy into heat.
  • FIGS. 1 to 6 are fragmentary side views of an escapement mechanism according to the invention and illustrating different operational positions of the mechanism
  • FIG. 7 is a fragmentary perspective View of a part of the mechanism.
  • FIG. 8 is a ⁇ fragmentary perspective View illustrating the connection between spacing device with the escapement mechanism.
  • FIG. 1 shows the normal inoperative position of the escapement mechanism in which the projection 3 of an escapement pawl 2 engages recess I of the rack, and abuts the next following tooth of the rack since the carriage is biased to move in the direction of the arrow a by the conventional carriage spring 1a with which it is connected by a band 1b.
  • a support lever 5 is mounted on the machine on a stationary pivot pin means 6 and has a portion provided with an abutment face 7, and with a pivot pin 4 on which escapement pawl 2 is mounted for angular movement between the rack engaging position illustrated in FIG. 1, and the releasing position illustrated in FIG. 2.
  • Support lever has an arm 10 articulated to a link 11 which is connected to a damping means in the form of a pneumatic brake 11a.
  • a spring 12 is connected at one end to escapement pawl 2, and at the other end to a pin 13 fixed to the stationary frame of the machine.
  • Spring 12 is oriented at an angle to the direction of carriage movement so that the spring force urges escapement pawl 2 to turn in counterclockwise direction from the releasing position shown in FIG. 2 to the engaging position shown in FIG. 1.
  • a force is exerted by spring 12 on the upper portion of support lever S and urges the same to turn in clockwise direction away from stop 8.
  • Such movement is prevented due to the fact that the carriage spring acts with a far greater force on escapement pawl 2 than spring 12.
  • Escapement pawl 2 has a projecting part 14 with a face parallel to rack 1 in the position of FIG. 1. A recess 15 is separated by shoulder 15a from this face, and is located adjacent the projection 3 of escapement pawl 2.
  • a control stop lever 22 is mounted on a stationary bracket 19a of the frame for turning movement about a pivot screw 19 located in a slot 1917 of bracket 19a.
  • control stop lever 22 has two stepped abutment faces 20 and 21 which are respectively positioned opposite a projection 9 of support lever 5 when control stop lever 22 is turned about pivot 19.
  • Control stop lever 22 has a portion 24 to which a rod is secured which is composed of a rod portion 29, a threaded connecting part 28, and a guide rod 25 which extends substantially parallel to the rack 1.
  • the hub 27 of an operating lever 16 is mounted on rod 25 for turning and axial movement.
  • An abutment 25a is secured to rod 25, and supports a spring 26 coiled about rod 25 and abutting hub 27 so that the operating lever 16 is urged outwardly until abutting a stop 25h.
  • operating lever 16 is connected to a link 18 which is operated by the universal bar 18a of the typewriter whenever a typebar 18h or the space bar is operated for the purpose of causing the carriage to move a step.
  • Arm 17 of operating lever 16 abuts portion 14 of escapement pawl 2, and when operating lever 16 is actuated, pawl 2 is turned in clockwise direction from the position shown in FIG. l to the position shown in FIG. 2 while arm 17 moves in the direction of the arrow b in FIG. 8.
  • the exact position of arm 17 on the horizontal face of projection 14 can be adjusted by operation of the threaded connection 28 which permits the displacement ot rod 25 with hub 27 of operating member 16, 17.
  • Blocking means are provided for controlling the escapement mechanism during operation of the tabulator and back spacing key of the typewriter, and include a springloaded blocking lever 30, a connecting shaft 32 mounted in the frame of the machine, and another arm 33, as best seen in FIG. 8.
  • a link 38 is connected to lever arm 33, and to the back spacing key, not shown, of the typewriter so that blocking lever 30 is held in a blocking position engaging arm of support lever 5 by a blocking face 31.
  • Arm 33 abuts a shiftable member 34 which includes a guide member 36 provided with slots in which stop tabs 35 of the tabulating device of the typewriter are mounted for vertical sliding movement.
  • Each stop tab 35 can be operated to be set to an operative position in which its upper end projects beyond the top of guide member 36, as shown for one stop tab 35 in FIG. 8.
  • Member 34, 36 is mounted on the stationary frame of the typewriter, and each set tabulator stop tab 35 cooperates with a stop 37 on the carriage of the typewriter to stop the carriage in a position determined by the setting of the respective stop tab 35. This arrangement is known, and not an object of the invention.
  • Member 34 has a pair ot longitudinal slots 34a receiving guide pin 34h, so that member 34, 36 can move a short distance when the carriage stop 37 engages a set tabulator tab 35. Such movement of member 34 will cause turning movement of lever arm 33 to the position illustrated in FIG. 8 in which blocking lever 30 is turned to a position abutting support lever 5 when the same is in the position shown in FIGS. 1 and 2.
  • the escapement mechanism illustrated in FIGS. 1 to 8 operates as follows:
  • the escapement mechanism In the normal condition of the typewriter, the escapement mechanism is in the position shown in FIG. l.
  • the projection 3 of escapernent pawl 2 projects into a recess I of rack 1 of the paper carriage of the typewriter, and holds the carriage which is urged to move in the direction of the arrow a by the conventional carriage spring, not shown.
  • Spring 12 acts on escapement pawl 2 with a force component which tends to turn escapement pawl 2 in counterlockiwse direction and to push projection 3 of escapement pawl 2 into recess I in the position illustrated in FIG. l.
  • spring 12 acts parallel to rack 1 and tends to turn support lever 5 in clockwise direction, but since the carriage spring exerts a stronger force in the opposite direction, spring 12 is ineffective and the abutment face 7 of support lever 5 abuts the terminal stop 8.
  • Control stop lever 22 is in a position in which its abutment face 20 is located opposite projection 9 of support lever 5 spaced from the same.
  • link 1S acts on operating lever 16 to turn the same in the direction of the arrow b in FIG. 8 so that arm 17 moves downward as viewed in FIGS. 1 and 2 and engages projection 14 of escapement pawl 2 to turn the same in clockwise direction from the position shown in FIG. 1 to the position shown in FIG. 2.
  • projection 3l moves out of recess I of rack 1 and assumes the releasing position shown in FIG. 2, the carriage is free to move in the direction of the arrow a under the action of the carriage spring 1a.
  • Projection 3 has thus been shifted at high speed in a direction opposite to the carriage movement and is located opposite the next following recess II of rack 1 before the carriage and rack 1 have moved in the direction of the arrow a which is due to the fact that the inertia of the carriage is much greater than the inertia of the light parts 5 and 2.
  • recess 15 of escapement pawl 2 has also moved to the right, and in the position of FIG. 3, arm 17 ot operating lever 16 is located opposite recess 15.
  • escapement pawl 2 out of a recess of rack 1 was accomplished by the force of lever arm 17 acting on projection 14, and as soon as lever arm 17 is located opposite recess 15, spring 12 can turn escapement pawl 2 in counterclockwise direction from the position shown in FIG. 3 to the position shown in FIG. 4 in which the tip of projection 3 is located in recess II of rack bar 1, whose next following tooth immediately engages projection 3 so that the force of the carriage spring is transmitted through the escapement pawl to the upper portion ot support lever 5 whereby support lever 5 is turned in counterclockwise direction to the position shown in FIG. 1 in which stop 8 engaging abutment face 7 blocks further movement of support lever 5 and of the carriage.
  • lever arm 17 of operating lever 16 remains in the actuated position shown in FIG. 4 due to the jamming of type bars, shoulder 15a of recess 5 engages lever arm 17 when escapement pawl 2 and support lever 5 are moved in the direction of the arrow a by the carriage and carriage spring toward stop 8. Since operating lever 16, 17 is mounted on rod 25 for axial movement, spring 26 is slightly compressed while operating member 16 is moved to the left on rod 25. As soon as the jammed type bars are restored to normal positions, spring means 116, see FIG. 8, and acting in a conventional manner on operating member 16, turn operating member 16 back to the normal position shown in FIG. l, overcoming the small friction produced by spring 26 between lever arm 17 and shoulder 15a. Consequently, even if the type bars are jammed, jamming of the escapement pawl 2 and corresponding running away of the carriage in the direction of the arrow a is prevented by the recess 15.
  • Doube-spacng operation In typing of headings it is customary to provide double spaces between successive letters. This is normally accomplished by operating the space bar after the carriage has performed a single step under the control of the escapement mechanism.
  • the escapement mechanism is set to automatically produce double spaces after each key actuation, in other words to stop the carriage after the same has moved a distance corresponding to two normal steps of the carriage.
  • abutment face 20 of control stop lever 22 is effective to stop support lever 5 in the position of FIG. 4.
  • a control means including a manually operated member 23a, see FIG. 1, and link 23 is manually set on the typewriter to shift link 23 so that control stop lever 22 is turned from its normal position in which abutment face 20 is located opposite projection 9, to a double step position in which abutment face 21 is located opposite projection 9.
  • Link 23 is attached to projecting part 24 of stop lever 22 to which rod 25 and operating lever 16 are also connected. Consequently, operating lever 16 is shifted to the right out of its normal position shown in FIG. l, and is located spaced a greater distance from recess 15 and shoulder 15a when abutment face 21 cooperates with support lever 5.
  • link 18 turns operating lever 16 as explained above so that escapement pawl 2 is turned in clockwise direction until projection 3 releases recess I, whereupon spring 12 turns support lever 5 in clockwise direction to the position shown in FIG. 5 in which projection 9 abuts abutment face 21 of control stop lever 22.
  • support lever 5 can turn through a greater angle as compared with the operation described with reference to FIGS. 1 and 2, and consequently escapement pawl 2 is shifted to the right as viewed in FIG. 5 to a position located opposite recess III, instead of re- 'the normal operation.
  • lever arm 17 was spaced twice the distance from recess 15 than in the condition of FIG. 1, and consequently will be located opposite recess 15 in the position shown in F-IG. 5 in Which escapement pawl 2 has travelled to the right twice the distance as during the normal operation. Consequently, even if the type bars are jammed, and operating lever 16 cannot return to its normal position, recess 15 will permit escapement pawl 2 to return to the rack engaging position shown in FIG. 6. Shoulder 15a again engages lever arm 17 during movement of escapement pawl 2 to the left while the carriage moves a distance corresponding to two steps until stopped by terminal stop 8.
  • coil spring 26 When operating lever 16 is urged to the left as viewed in FIG. 6, coil spring 26 is compressed so that operating lever 16 is again moved to the right to its normal position when releasing shoulder 15a. If coil spring 26 is secured to hub 27, and torsionally stressed by operating lever 16 in the position shown in FIGS. 3 to 6, it also exerts a torque on operating lever 16 tending to return the same to its normal position.
  • the escapement pawl is moved in a direction opposite to the carriage movement to engage the rack of the carriage before the released carriage has started its movement under the action of the carriage spring.
  • This arrangement has advantages over constructions in which the carriage is stopped by the escapement pawl when the same moves back into a rack engaging position.
  • such relative movement between escapement pawl and the carriage rack are undesirable since the carriage would not be stopped in the intended position.
  • Blocking means 33, 32, 30 is normally held by a spring 30a in a position in which abutment face 31 of blocking lever 31) is spaced from support lever 5 in the normal position of FIG. l. Blocking means 33, 32, 30 can be moved to a blocking position in which abutment face 31 abuts arm 10 of support lever 5, as shown in FIG. 8.
  • Blocking means 33, 32, 30 can be moved from its normal inoperative position to the blocking position by a link 38 which is operated by back spacing means including link 38.
  • link 38 Upon operation of the back spacing key, not shown, link 38 is shifted to the left as viewed in FIG. 8, and turns the blocking means so that blocking lever 30 moves to the block-ing position in which turning of support lever 5 in clockwise direction is prevented. Consequently, when operating lever 16 is turned in the direction of the arrow b in FIG. 8, and escapement pawl 2 is turned in clockwise direction to the position shown in F-IG. 2, blocking lever 30 prevents turning of support lever 5 in clockwise direction out of the position shown in FIG. 2 so that escapement pawl 2 cannot move to the position shown in FIG. 3 in the direction of the arrow c.
  • spring 12 will turn escapement pawl 2 about pivot pin 4 in counterclockwise direction so that projection 3 would move back to the same recess as before, were it not for the fact that the conventional hook of the back spacing means has engaged a recess in rack 1 under the control of the conventional back spacing key and shifted the carriage in the meantime one step in the direction of the arrow c so that projection 3 will fall into the preceding recess, as desired.
  • escapement pawl 2 When the tabulating means 90 of the typewriter is actuated, escapement pawl 2 is turned about pin 4 by a part 90a of the tabulator means to the position of FIG. 2 so that the carriage can start its tabulating movement which continues as long as tabulator key 90 is depressed. Release of key 90 causes engagement of rack 1 by projection 3.
  • tabulator stop 37 of the carriage When key 90 is held depressed and the carriage arrives in a tabulating position in which a tabulator tab 35 was set, tabulator stop 37 of the carriage abuts the projecting set tabulator tab 35, and shifts member 36, 34 to the left as viewed in FIG. 8 from a position in which pins 34b are located at the left ends of slots 34a to the illustrated position in which pins 34h are located at the other end of slots 34a and stop member 34, 36 and thereby the carriage.
  • lever arm 33 of the blocking means is turned so that blocking lever 30 is turned from its normal inoperative position to the blocking position shown in FIG. 8.
  • End face 31 of blocking lever 30 engages arm of lever 5 and turns the same to the position shown in FIG. l before projection 3 of pawl 2 can engage a recess in the rack.
  • rotation of support lever S in clockwise direction is prevented and projection 3 engages a recess of the rack when tabulator key 90 is released.
  • a lost-motion connection between link 3S and the back spacing key, not shown, permits the turning of lever arm 33 with link 38.
  • escapement pawl 2 does not perform a movement in the direction of the arrow c, and its projection 3 will be urged by spring 12 to engage a recess spaced from the previously engaged recess I a distance corresponding exactly to the tabulated distance.
  • a spring 11b urges the piston 11C of damping means 11a into the position shown in FIG. 3.
  • the force of spring 12 is not required for this operation during clockwise movement of support lever 5 when the same moves away from ange 11d.
  • the fast pneumatic braking movement caused by the inertia of the carriage requires far more force than the compression of spring 11b.
  • the damping piston 11C is returned by spring 11 from the position of FIG. l to the position of FIG. 3 until ange 11d abuts against lever 5.
  • the movement of supp-ort lever 5 is dampened at least during the last part of its movement toward stop 8 so that the speed of the carriage is gradually reduced.
  • Tests and exact measurings have proven that the braking of the carriage by damping means requires less time than the destruction of the kinetic energy after an undampened impact of abutment face 7 on stop S.
  • fast stopping of the carriage after a step has the result that the next following imprint is made in exactly the right position so that the typed characters are exactly spaced. Due to the damping of the carriage before engagement with the stop, no bouncing back of the carriage takes place after engagement between abutment face 7 and stop 8.
  • the damping means are in accordance with the present invention non-resilient, and consume the entire kinetic energy of the carriage, for example by trasforming the energy into heat, so that after the carriage has been stopped, no energy remains which could cause bouncing back of the carriage.
  • stop 8 is adjustable, for example by threaded means 8a located in the slot 8b of a iixed -bracket 8c so that the carriage position in the normal condition of the escapement mechanism shown in FIG. l is exactly determined.
  • the left end position of projection 3 is set.
  • the right end position of projection 3 of escapement pawl 2 is determined by adjusting control stop lever 22 in vertical direction by adjustment of screw 19 relative to bracket 19a whereby the abutment faces 20 and 2l of control lever 22 are moved toward or away from projection 9 of support lever 5.
  • the escapement mechanism of the present invention comprises few and simple parts which operate reliably in such a manner as to be subjected to very little wear.
  • the principle of the invention may also be applied to escapement mechanism employing two escapement pawls in which event each escapement pawl is mounted on an individual support lever 5, each of which is connected to a damping means.
  • An escapement mechanism comprising, in combination, carriage means biassed to move in one direction and having a rack with teeth spaced in said one direction; a support reciprocable along said rack; an escapement member mounted on said support for movement between a rack engaging position and a releasing position, and for movement with said support between a plurality of positions cooperating with different teeth of said rack, said escapement member having a lrecess; biassing means for urging said support to move opposite to said one direction of carriage movement for moving said escapement member to said plurality of positions, and said escapement member to move to said engaging position; operating means including an operating member movable transversely to said one direction of carriage movement to and from an operative position engaging said escapement member for moving said escapement member to said releasing position so that lsaid biassing means move said support with saidl escapement member in a direction opposite to the carriage movement until said escapement member moves to said engaging position whereupon said carriage means moves said escapement member and said support in said one direction, said operating member being located opposite said recess when
  • An escapement mechanism comprising, in combination, carriage means biassed to move in one direction and having a rack with teeth spaced in said one direction; a support reciprocable along said rack; an escapement member mounted on said support for movement between a rack engaging position and a releasing position, and for movement with said support between a plurality of positions cooperating with diierent teeth of said rack, said escapement member having a recess; biassing means for urging said support to move opposite to said one direction of carriage movement for moving said escapement member to said plurality of positions, and said escapement member to move to said engaging position; operating means including an operating member movable transversely to said one direction of carriage movement to and from an operative position engaging said escapement member for moving said escapement member to said releasing position so that said biassing means move said support with said escapement member in a direction opposite to the carriage movement until said escapement member moves to said engaging position whereupon said carriage means moves said escapement member and said support in said one direction, said operating member being located opposite said recess when said support has moved
  • an escapement mechanism comprising carriage means biassed to move in one direction and having a rack with teeth and recesses spaced in said one direction; a support reciprocable along said rack; an escapement member mounted on said support for movement between a rack engaging position and a releasing position, and for movement with said support between a plurality of positions cooperating with different teeth of said rack; means connecting said escapement member with said tabulating device so that said escapement member is moved to said releasing position when said tabulating device is operated; biassing means for urging said support to move opposite to said one direction of carriage movement, and said escapement member to move to said engaging position; operating means for moving said escapement member to said releasing position out of one said recesses so that said biassing means move said support with said escapement member in a direction opposite to said one direction until said escapement member moves to said engaging position into another recess before said carriage means moves, whereupon said carriage means moves said escapement member and said support in said one direction; stop means for limiting movement of said support and said carriage means in said one direction
  • an escapement mechanism comprising carriage means biassed to move in one direction and having a rack with teeth and recesses spaced in said one direction; stationary pivot means; a support lever mounted on said stationary pivot means for turning movement about the same and having a portion reciprocable substantially in the direction of said rack; an escapement pawl mounted on said portion of said support lever for angular movement between a rack engaging position and a releasing position, and for movement with said portion between a plurality of positions located opposite different recesses of said rack said escapement pawl having a ⁇ face substantially parallel to said rack, and a recess in said face; spring means secured to said stationary pivot means and connected to said escapement pawl for turning the same into said engaging position and acting on said support lever through said escapement pawl to urge said portion to move opposite to said one direction of carriage movement for moving said escapement member to said plurality of positions; a rod extending parallel to said rack; an operating member mounted on said rod for movement with the same and for turning movement, said operating member
  • control stop means being Connected with said rod for shifting the same with said operating member parallel to said rack so that said part of said operating member moves relative to said recess and said face of said escapement pawl; and terminal stop means for limiting movement of said support lever and said carriage means in said one direction.
  • a mechanism as set forth in claim 4i wherein said operating member is mounted on said rod for moving along the same, and including a spring abutting said rod and said operating member so that said spring is deformed when said operating member moves on said rod while located in said recess of said escapement pawl and er1- gaged by the same during movement of the same with said carriage, said rod including two parts, and an adjustable part between said two parts whereby the position of said operating member can be adjusted.

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US346716A 1963-02-27 1964-02-24 Escapement mechanism for typewriters Expired - Lifetime US3358806A (en)

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DE19631303084 DE1303084C2 (de) 1963-02-27 1963-02-27 Wagenschrittschaltwerk fuer schreiboder aehnliche maschinen
DEG0037157 1963-02-27

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578132A (en) * 1967-02-06 1971-05-11 Olivetti & Co Spa Half-space carriage return mechanism for typewriters
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
US3861513A (en) * 1974-02-14 1975-01-21 Teletype Corp System for dampening return motion of a carriage
US3944029A (en) * 1974-11-22 1976-03-16 Centronics Data Computer Corporation Damper for printing and the like
US3985220A (en) * 1970-10-23 1976-10-12 Olympia Werke Kg Tabulator apparatus for a typewriter carriage moving in steps of different length

Citations (6)

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US1090219A (en) * 1912-05-03 1914-03-17 Underwood Typewriter Co Type-writing machine.
US2010223A (en) * 1934-03-20 1935-08-06 L C Smith & Corona Typewriters Typewriting machine
US2536619A (en) * 1948-03-26 1951-01-02 Underwood Corp Escapement mechanism for typewriting and like machines
US2862595A (en) * 1954-10-18 1958-12-02 Underwood Corp Proportional letter-feed mechanism for typewriters or the like
US2872015A (en) * 1954-12-29 1959-02-03 Under Wood Corp Stepwise carriage positioning mechanism and related features
US3095077A (en) * 1958-03-29 1963-06-25 Byers Edward Victor Universal bar for typewriters

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US1090219A (en) * 1912-05-03 1914-03-17 Underwood Typewriter Co Type-writing machine.
US2010223A (en) * 1934-03-20 1935-08-06 L C Smith & Corona Typewriters Typewriting machine
US2536619A (en) * 1948-03-26 1951-01-02 Underwood Corp Escapement mechanism for typewriting and like machines
US2862595A (en) * 1954-10-18 1958-12-02 Underwood Corp Proportional letter-feed mechanism for typewriters or the like
US2872015A (en) * 1954-12-29 1959-02-03 Under Wood Corp Stepwise carriage positioning mechanism and related features
US3095077A (en) * 1958-03-29 1963-06-25 Byers Edward Victor Universal bar for typewriters

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578132A (en) * 1967-02-06 1971-05-11 Olivetti & Co Spa Half-space carriage return mechanism for typewriters
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
US3861513A (en) * 1974-02-14 1975-01-21 Teletype Corp System for dampening return motion of a carriage
US3944029A (en) * 1974-11-22 1976-03-16 Centronics Data Computer Corporation Damper for printing and the like

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DE1303084B (enrdf_load_stackoverflow) 1974-01-31

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