US2951572A - Repeat actuation mechanism for business machines - Google Patents

Repeat actuation mechanism for business machines Download PDF

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Publication number
US2951572A
US2951572A US817785A US81778559A US2951572A US 2951572 A US2951572 A US 2951572A US 817785 A US817785 A US 817785A US 81778559 A US81778559 A US 81778559A US 2951572 A US2951572 A US 2951572A
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actuating
control
control member
holding
actuation
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US817785A
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English (en)
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Neidhardt Rudolf
Bahmann Franz
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Triumph Werke Nuernberg AG
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Triumph Werke Nuernberg 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • B41J25/04—Back spacing

Definitions

  • the present invention relates to a mechanism for selectively effecting single actuation and repeated actuation of a machine element, and more particularly to a mechanism for effecting in an electric business machine, such as an electric typewriter, repeated line shifting, spacing, back-spacing, and similar repeated operations as long as the respective key is held depressed, whereas only a single operation is performed if the key is immediately released.
  • Another object of the present invention is to provide an actuation mechanism of compact construction permitting an alignment of several devices of this type along the drive roll of an electric typewriter within a comparatively small space.
  • Another object of the present invention is to provide an actuation mechanism permitting start of any repeat operation only after completion of the preceding operation.
  • Another object of the present invention is to provide a mechanism for selectively effecting single actuation and repeated actuation of different machine elements of a business machine, so that the same mechanism can be used for line shifting, spacing, back-spacing, and other operations.
  • the present invention mainly consists in a mechanism for selectively effecting single actuation and repeated actuation of a machine element such as a line shifting device, a spacing device, or a backspacing device of an electric typewriter provided with a rotary drive roll, the mechanism comprising a support; control means, preferably including a control member mounted on the support and an eccentric disc turnably mounted on the control member and engaging the drive roll in a control position of the control member so that the control member is reciprocated; operator influenced means, for example a line-shifting key, the space bar, or the back-spacing key, for eliecting movement of the control member to the position in which the eccentric disc engages the drive roll; holding means mounted on the support movable to a holding position for holding the control member in a normal position; and actuating means movable to and from an actuating position for effecting a single actuation of the machine element.
  • a machine element such as a line shifting device, a spacing device, or a backspac
  • the actuating means are operatively connected to the control means, and more particularly to the control member, by a linkage so as to be moved by the control membet to the actuating position when the eccentric disc turns and moves the control member.
  • the actuating means are also connected by a suitable linkage to the holding means for moving the same to and from the holding position when moving to and from the acutating position.
  • the control member moves again to the control position after the first actuation of the machine element so that the eccentric disc is again engaged by the drive roll and shifts the control member to effect another actuation of the machine element, and such actuations are repeated as long as the operator influenced means is held in actuated position.
  • the control member can return to its normal position after a single actuation of the machine element, and in this manner the initial condition of the mechanism is again established.
  • a locking means is provided which tends to lock the control member in its normal position.
  • the operator influenced means ⁇ acts on the locking means to move the same to a position releasing the control member so that the same moves to the position in which the eccentric disc engages the drive roll.
  • Fig. l is a perspective view illustrating a part of the actuation mechanism of the present invention with other parts omitted for the sake of clarity;
  • Fig. 2 is a fnagmentary side elevation of the mechanism. of the present invention illustrating the normal position of rest of the mechanism;
  • Fig. 3 is a fragmentary side elevation of the mechanism illustrating the operational position of the device directly after actuation of the operator influenced means
  • Fig. 4 is a side elevation illustrating another operational position of the mechanism
  • Fig. 5 is a side elevation of the mechanism illustrating a further operational position of the device.
  • Fig. 6 is a side elevation of a line-shifting device operated by the actuation mechanism of the present invention.
  • a support 1 is fixedly mounted on the frame of the business machine, not shown, opposite the conventional drive roll 13 which is continuously rotated in the direction of the arrows.
  • the support is U-shaped, and has two parallel legs 2 and 3.
  • a control means is provided which includes a control member 41, and arm 27 fixedly secured to control member 4, and an eccentric disc 9 which is mounted for turning movement on a pin 8 extending between two parallel plates which are part of control member 4.
  • the plates are further connected by a pin 7 which is turnably mounted on the leg 2 of support 1 so that the entire control means may turn about the axis of pin 7.
  • the position of Fig. 1 corresponds to the position of Fig.
  • a projecting member 17 is fixedly secured, for example welded, to one plate of control member 4, and has a shoulder 16 located opposite a hook-shaped projection 26 of the locking means'6.
  • Locking means 6 has an arm engaged by a spring 21 which is secured to the frame of the machine, not shown, so that the locking means 6 tends to assume the illustrated locking position in which projection 26 engages shoulder 16, and locks control member 4 in the normal position of rest illustrated in Figs. 1 and 2. 7
  • Locking means 6 has another arm formed with a rectangular cutout 25 which receives the reduced end portion 24 of an operator influenced bar 22 which is shifted in longitudinal direction when a corresponding key, not shown, is moved to, and held in, an actuated depressed position.
  • Locking means 6 has a fixed pin 23 which is turnably mounted in a corresponding bore in leg 3 of support 1. Therefore, when the operator influenced means 22 is shifted in longitudinal direction due to the actuation of the respective key, locking means 6 is turned in clockwise direction as viewed in Figs. 1 and 2, so that the projection 26 releases the shoulder 16 of control member 4 permitting the control member to move from the position illustrated in Fig. 2 to the position illustrated in Fig. 3 under the action of spring 12.
  • a holding means 5 is mounted on leg 3 of support 1 turnable about a pin 18.
  • Holding means 5 includes an arm 28, and a hook-shaped projection 20 which is located opposite a shoulder 15 in control member 4. Shoulder 15 is aligned with shoulder 16 in the projecting member 17.
  • a spring 19 is secured to a projection on leg 3 of support 1 and to a projection on arm 28 of holding means 5 and urges holding means 5 into a holding position engaging shoulder 15 on control member 4 as will be explained hereinafter in greater detail.
  • the holding means 5 in holding position is capable of holding control member 4 in its normal position of rest, but is normally in the inoperative position illustrated in Fig. 1.
  • Leg 2 of support 1 has an inner projection 11 which is engaged by a lateral projection on the eccentric disc 9 in the normal position of rest of the mechanism.
  • control member 4 moves from the normal position of rest shown in Figs. 1 and 2 to the control position shown in Fig. 3 upon release by locking means 6, projection 10' moves away from projection 11.
  • the device illustrated in Fig. 1 is connected by linkages to an actuating member 40 which is operatively connected to the machine element which is to be actuated, and actuates the same to perform a single operation whenever the actuating member 40 moves from the normal position illustrated in Figs. 2 and 3 to the actuating position illustrated in Figs. 4 and 5.
  • a first linkage is connected to arm 27 of control member 4- and includes a rod 31, and a pin 131 located in a slot 29 in arm 27.
  • the other end of rod 31 in articulated to a lever system including a lever 33 pivotally mounted on a pin 32 on the frame of the machine, another lever 37 pivotally mounted on a pin 36 on the frame of the machine, and a connecting link 35 articulated to levers 33 and 37 and being spring-loaded by a spring 34 which is secured to the frame of the machine.
  • Actuating member 40 has a slot 39 extending in longitudinal direction of the same, and receiving pin 38 which is fixed to lever 37. Actuating member 40 is under the influence of a spring 41 which is secured to the frame of the machine, and urges actuating member 40 into the normal position of rest illustrated in Figs. 2 and 3 in which pin 38 is located at the upper end of slot 39.
  • Actuating member 40 has an arresting projection 42 which cooperates with an arresting member 43. In the position illustrated in Figs. 2 and 3, arresting member 43 is inoperative, but when actuatingmember 40 is raised to the actuating position illustrated in Figs. 4 and 5, ar-
  • resting member 43 engages the projection 42, and arrests actuating member 40 in its actuating position, until upon retraction of arresting member 43, actuating member 40 is again free to return to its normal position of rest under the action of spring 41.
  • Actuating member 40 controls and actuates a machine element, for example a line-shifting device, a spacing device or a back-spacing device. Whenever actuating member 40 is moved to its actuating position, the respective device will be once actuated, for example shift the platen to another line position, or shift the carriage of the machine one space in forward direction, or shift the carriage of the machine one step in backward direction.
  • the respective devices are of a mechanical construction in which upon completion of a single operation, the arresting member 43 is retracted to the inoperative position shown in Figs. 2 and 3, permitting return of actuating member 40 from its actuating position shown in Figs. 4 and 5 to its position of rest shown in Figs. 2 and 3.
  • Second linkage means connect the lower end of actuating member 40 with arm 28 of holding means 5.
  • the second linkage means include a lever 45 mounted on a pin 44 on the frame of the machine, and articulated at its ends to actuating member 40 and to the end of a rod 46.
  • the other end of rod 46 is provided with a fixed pin slidable in a slot 30 in arm 28 of holding means 5.
  • Pin 130 in slot 30 and pin 131 in slot 29 constitute lost motion means permitting a relative movement .between arms 27, 28 and actuating member 40.
  • actuating member 40 has a slot 47 receiving a pin 48.
  • the end of actuating member 40 has an arcuate face 40a on which lies a rib member 49 extending over the whole length of platen roll 57.
  • the rib member 49 has arms 50 pivoted on a pin 51.
  • rib member 49 is under the influence of a spring 52 which is secured to the frame of the machine.
  • a bar 53 having a tooth 54 meshing with the teeth 55 of a toothed wheel 56 which is mounted together with the platen roll 57 on shaft 58.
  • Bar 53 has a slot 59 which cooperates with a pin 60 of a double-armed lever 62, pivoted on apin 61.
  • the free end of the lever 62 has an arcuate face 63 cooperating with the free end 64 of another lever 65 pivoted on a pin 66.
  • the other end of lever 65 turnably supports the arresting member 43 resting on a stop 68 under the influence of a spring 67 which is secured to the frame of the machine.
  • Control member 4 turns under the action of spring 12 in clockwise direction about the axis of pin 7 so that shaft 8 of eccentric disc 9 moves in direction of the arrow b from the position illustrated in Fig. 2 to the position illustrated in Fig. 3 in which the periphery of the eccentric disc 9 frictionally engages the surface of the continuously rotating drive roll 13 and is rotated in direction of the arrow in Fig. 3.
  • shifting of the actuating member 40 to its actuating position effects actuation of an element of the business machine, for example a single line shifting operation of the line shifting device.
  • the line shifting device or corresponding device, will retract arresting member 43, so that actuating member 44 ⁇ is released after a single actuation, and will return to its normal position of rest under the action of spring 41.
  • lever 45 turns and pulls rod 46 to the left in direction of the arrow e in Fig. 4 so that, after overcoming the lost-motion between pin 130 and slot 30, the holding'means is turned by its arm 28 in clockwise direction as viewed in the drawing.
  • holding means 5 has been turned in clockwise direction under control of linkage 31, 45 while actuating member 40 moved to its actuating position, so that the holding projection 20 of holding means 5 engages shoulder of control member 4, as shown in Fig. 5, and temporarily holds control member 4 in its normal position.
  • Locking means 6 is free to turn under the action of spring 21 about the axis of pin 23 to the locking position
  • Actuating member 40 moves to its normal position ofrest shown in Figs. 2 and 3, under the action of spring 41.
  • the linkage means 45, 46 move back to the position shown in Fig. 2.
  • Holding means 5, 28 turns: in counterclockwise direction as viewed in Fig. 2, so that projection 20 releases shoulder 15, and the device is again in its initial position in which the control means 4, 27, 9, 17 are held in normal position only by the shoulder 26 of locking means 6.
  • locking means 4 will return to its lockin-g position locking control member 4 in its normal position in which it is temporarily held by the holding means 20 after each actuation. Since the locking means 6, 26 lock the control member 4, retraction of the holding means 5, 26 will not cause movement of the control member 4 toward the drive roll 13.
  • a hue-shifting device but a spacing device, or a back-spacing device, or any other machine element which may be actuated once or several times, can be controlled by the actuating member 40.
  • the devices used in connection with the mechanism of the present invention must be provided with means for retracting the arresting member 43 after a single actuation, permitting return of the actuating member to its normal position of rest after each actuation.
  • the particular construction of the respective devices is not an object of the present invention.
  • a mechanism for selectively effecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means mounted on said support movable between a normal position and a control position engaging said drive roll for being reciprocated by the same; operator influenced means movable to and from an actuated position for efiecting movement of said control means to said control position and for holding said control means in said control position so that said control means is once reciprocated by said drive roll if said operator influenced means is immediately released and is repeatedly reciprocated if said operator influenced means is maintained in said actuated position; holding means mounted on said support movable to and from a holding position for engaging and holding said control means in said normal position; and actuating means movable to and from an actuating position for efiecting a single actuation of the machine element, said actuating means being operatively connected to said control means to be moved by the same to said actuating position when said control means is reciprocated, said actuating means
  • a mechanism for selectively eflecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member mounted on said support movable between a normal position and a control position, and an eccentric disc rotatively mounted on said control member, said eccentric disc engaging said drive roll in said control position of said control member so that the same is reciprocated; operator influenced means movable to and from an actuated position for eflecting movement of said control member to said control position and for holding said control member in said control position so that said control member is once reciprocated by said drive roll if said operator influenced means is immediately released and is repeatedly reciprocated if said operator influenced means is maintained in said actuated position; holding means mounted on said support movable to and from a holding position for engaging and holding said control member in said normal position; and actuating means movable to and firom an actuating position for efiecting a single actuation of the machine element, said actuating means being
  • a mechanism for selectively efiecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member mounted on said support movable between a normal position and a control position, and an eccentric disc rotatively mounted on said control member, said eccentric disc engaging said drive roll in said control position of said control member so that the same is reciprocated, said eccentric disc engaging said support in said normal position of said control member in an initial position in which said eccentric disc is spaced from said drive roll, said disc releasing said support when said control member moves to said control position; operator influenced means movable to and from an actuated position for effecting movement of said control member to said control position and for holding said control member in said control position so that said control member is once reciprocated by said drive roll if said operator influenced means is immediately released and is repeatedly reciprocated if said operator influenced means is maintained in said actuated position; holding means mounted on said support movable to and from a holding position for engaging and holding said control
  • a mechanism for selectively efiecting single actuation and repeated actuation of a machine element comprising, in combination, a notary drive roll; a support; control means including a control member mounted on said support movable between a normal position and a control position, and an eccentric disc rotatively mounted I011 said control member, said eccentric disc engaging said drive roll in said control position of said control member so that the same is reciprocated; operator influenced means movable to and from an actuated position for eflecting movement of said control member to said control position and for holding said control member in said control position so that said control member is once reciprocated by said drive roll if said operator influenced means is immediately released and is repeatedly reciprocated if said loperator influenced means is maintained in said actuated position; holding means mounted on said support movable to and from a holding position for engaging and holding said control member in said normal position; spring means on said support for urging said holding means into said holding position; actuating means movable to and from an actuating position for effecting
  • control member is pivotally mounted on said support; wherein said holding means is a holding lever pivotally mounted on said support and having a holding projection for engaging said control member; wherein said holding lever and said control member are formed with slots; and wherein said first and second linkage means include pins respectively located in said slots to provide a lost motion between said actuating means, and said holding lever and control member.
  • a mechanism for selectively effecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member and an eccentric disc mounted on said control member rotatable about an axis, said control member being pivotally mounted on said support movable between an intermediate normal position, a first control position in which said axis is spaced a shorter distance and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc engaging said drive roll in said control positions of said control member so that the same is reciprocated between said first and second control positions; operator influenced means movable to and from an actuated position for effecting movement of said control member to said first control position so that said control member is once reciprocated by said drive roll it said operator influenced means is immediately released and is repeatedly reciprocated if said operator influenced means is maintained in said actuated position; holding means mounted on said support movable to and from a holding position for engaging and holding said control member in said normal position
  • a mechanism for selectively eflecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member and an eccentric disc mounted on said control member rotatable about an axis, said control member being pivotally mounted on said support movable between an intermediate normal position, a first control position in which said axis is spaced a shorter distance and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc engaging said drive roll in said control positions of said control member so that the same is reciprocated between said first and second control positions, said eccentric disc having a projection engaging said support in said normal position of said control member in an initial angular position in which the periphery of said eccentric disc is spaced from said drive roll, said projection releasing said support in said first control position of said control member; operator influenced means movable to and from an actuated position for effecting movement of said control member to said first control position so that said control member is once reciproc
  • a mechanism for selectively effecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member and an eccentric disc mounted on said control member rotatable about an axis, said control member being pivotally mounted on said support movable between an intermediate normal position, a first control position in which said axis is spaced a shorter distance and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc engaging said drive roll in said control positions of said control member so that the same is reciprocated between said first and second control positions, said eccentric disc having a projection engaging said support in said normal position of said control member in an initial angular position in which the periphery of said eccentric disc is spaced from said drive roll, said projection releasing said support in said first control position of said control member; spring means connected to said support and urging said control member to move to said first control position; operator influenced means movable to and from an actuated position for effecting
  • a mechanism for selectively effecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member mounted on said support, and an eccentric disc mounted on said control member rotatable about an axis, said control member being turnable between an intermediate normal position, a first control position in which said axis of said eccentric disc is spaced a shorter distance, and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc peripherally engaging said drive roll in said control positions of said control member, so that the same is reciprocated between said first and second control positions; locking means mounted on said support movable between a locking position for locking said control member in said normal position, and a releasing position; operator infiuenced means operatively connected to said locking means and being movable to and from an actuated position for moving said locking means to said releasing position and for holding the same in said releasing position, if desired; holding means mounted on said support
  • a mechanism for selectively effecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support;
  • control means including a control member mounted on said support, and an eccentric disc mounted on said control member rotatable about an axis, said control member being turnable between an intermediate normal position, a first control position in which said axis of said eccentric disc is spaced a shorter distance, and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc peripherally engaging said drive roll in said control positions of said control member, so that the same is reciprocated between said first and second control positions; spring means on said support for urging said control member into said first control position; locking means mounted on said support movable between a locking position for locking said control member in said normal position, and a releasing position; spring means on said support for urging said locking means to said locking position; operator influenced means operatively connected to said locking means and being movable to and from an actuated position for moving said locking means to said releasing position and for holding the same in said releasing position, if desired; holding means mounted on said support movable to and from a holding posi
  • a mechanism for selectively effecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member mounted on said support, and an eccentric disc mounted on said control member rotatable about an axis, said control member being turnable between an intermediate normal position, a first control position in which said axis of said eccentric disc is spaced a shorter distance, and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc peripherally engaging said drive roll in said control positions of said control member, so that the same is reciprocated between said first and second control positions, said eccentric disc having a projection engaging said support in said normal position of said control member in an initial position in which the periphery of said eccentric disc is spaced from said drive roll, said projection releasing said support in said first control position of said control member; spring means on said support for urging said control member into said first control position; locking means mounted on said support movable between a locking position for locking said control
  • a mechanism for selectively efiecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member pivotally mounted on said support, and an eccentric disc mounted on said control member rotatable about an axis, said control member being turnable between an intermediate normal position, a first control position in which said axis of said eccentric disc is spaced a shorter distance, and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc peripherally engaging said drive roll in said control positions of said control member, so that the same is reciprocated between said first and second control positions, said eccentric disc having a projection engaging said support in said normal position of said control member in an initial position in which the periphery of said eccentric disc is spaced from said drive roll, said projection releasing said support in said first control position of said control member; spring means on said support for urging said control member into said first control position; locking means pivotally mounted on said support movable between
  • a mechanism for selectively eifecting single actuation and repeated actuation of a machine element comprising, in combination, a rotary drive roll; a support; control means including a control member pivotally mounted on said support, and an eccentric disc mounted on said control member rotatable about an axis, said control member being turnable between an intermediate normal position, a first control position in which said axis of said eccentric disc is spaced a shorter distance, and a second control position in which said axis is spaced a greater distance from said drive roll, said eccentric disc peripherally engaging said drive roll in said control positions of said control member, so that the same is reciprocated between said first and second control positions; locking means pivotally mounted on said support movable between a locking position for locking said control member in said normal position, and a releasing position; operator influenced means operatively connected to said locking means and being movable to and from an actuated position for moving said locking means tosaid releasing position and for holding the same in said releasing position, if desired; holding means pivot
  • said locking means has a hook-shaped locking portion;
  • said holding means is a holding lever having a hookshaped holding portion;
  • said control member includes two parallel fixedly connected portions and a projecting member secured to one of said portions, shoulders being formed on said projecting member and on said 15 one portion of said control member; and wherein said hook-shaped holding portion engages the shoulder on said one portion of said control member in said holding position of said holding means, and said hook-shaped locking portion engages said shoulder on said projecting member in said locking position of said locking means.
  • a mechanism as set forth in claim 13 wherein said support is a U-shaped member having one leg pivotally supporting said holding means and said locking. means, and another leg pivotally supporting said control member.
  • said actuating means include a spring-loaded actuating member operatively connected to said holding means, and a spring-loaded lever system connected to said actuating means and operatively connected to said control member; and means adapted to be controlled by said machine element to lock said actuating member in said actuating position, and to release said actuating member to move out of said actuating position after completion of a single operation of the machine element.
  • said holding means includes a lever arm formed with a slot; wherein said control member includes a lever arm having a slot; and including first linkage means connecting said actuating means with said arm of said control member and including a pin located in said slot of the same; and second linkage means for connecting said actuating means with said arm of said holding means and including a pin located in said slot of said arm of said holding means.

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US817785A 1958-06-04 1959-06-03 Repeat actuation mechanism for business machines Expired - Lifetime US2951572A (en)

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Application Number Priority Date Filing Date Title
DET0015226 1958-06-04
DE870217X 1958-06-04
DE2951572X 1958-06-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181680A (en) * 1963-05-14 1965-05-04 Scm Corp Power control apparatus in a data transferring device
US3322254A (en) * 1966-08-17 1967-05-30 Royal Typewriter Co Inc Cam operated repeat mechanism
US3430748A (en) * 1966-11-04 1969-03-04 Gwynn J Parri Paper feeder coordinated with platen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2188935A (en) * 1937-02-18 1940-02-06 Wittenmyer Carles Typewriter
US2600200A (en) * 1949-10-19 1952-06-10 Underwood Corp Repeat type action for typewriters and like machines
US2714948A (en) * 1951-07-25 1955-08-09 Sperry Rand Corp Repeat key action for power operated typewriters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2188935A (en) * 1937-02-18 1940-02-06 Wittenmyer Carles Typewriter
US2600200A (en) * 1949-10-19 1952-06-10 Underwood Corp Repeat type action for typewriters and like machines
US2714948A (en) * 1951-07-25 1955-08-09 Sperry Rand Corp Repeat key action for power operated typewriters

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181680A (en) * 1963-05-14 1965-05-04 Scm Corp Power control apparatus in a data transferring device
US3322254A (en) * 1966-08-17 1967-05-30 Royal Typewriter Co Inc Cam operated repeat mechanism
US3430748A (en) * 1966-11-04 1969-03-04 Gwynn J Parri Paper feeder coordinated with platen

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DE1073008B (de) 1960-01-14
CH368511A (de) 1963-04-15

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