US3595361A - Ribbon fork actuating mechanism for typewriters and the like - Google Patents

Ribbon fork actuating mechanism for typewriters and the like Download PDF

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Publication number
US3595361A
US3595361A US713808A US3595361DA US3595361A US 3595361 A US3595361 A US 3595361A US 713808 A US713808 A US 713808A US 3595361D A US3595361D A US 3595361DA US 3595361 A US3595361 A US 3595361A
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US
United States
Prior art keywords
lever
coupling links
levers
drive
drive shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US713808A
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English (en)
Inventor
Rudolf Rekewitz
Peter Kulzer
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Siemens AG
Siemens Corp
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Siemens Corp
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Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
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Publication of US3595361A publication Critical patent/US3595361A/en
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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
    • B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/04—Ink-ribbon guides
    • B41J35/10—Vibrator mechanisms; Driving gear therefor
    • B41J35/12—Vibrator mechanisms; Driving gear therefor adjustable, e.g. for case shift
    • B41J35/14—Vibrator mechanisms; Driving gear therefor adjustable, e.g. for case shift for multicolour work; for ensuring maximum life of ink ribbon; for rendering ink-ribbon inoperative

Definitions

  • Pellegrino Attorney-Hill, Sherman, Meroni, Gross and Simpson ABSTRACT An apparatus for typewriters and the like, particularly power-driven apparatus for effecting a positive lifting and lowering of the ribbon fork thereof between a rest position and either one of two operating positions, in which a drive lever is operatively coupled to the ribbon fork actuating arm through a pair of intermediate levers, and control of the operating connection is effected by rigidly connecting the drive lever with one of the intermediate levers, whereby they act as one, or rigidly connecting the intermediate levers whereby they act as a single lever, the selection being determined by the positioning of a control member which correspondingly actuates the means for effecting such rigid connections.
  • the invention is directed to an apparatus for use in typewriters, particularly power-driven typewriters, and similar equipment for example, teletype machines, where high operating speeds are involved, for positively lifting and lowering the ribbon fork thereof between a rest position and one of two possible operating positions by means of an articulated lever system.
  • the ribbon fork During the typing operations the ribbon fork must be lifted for each symbol to be printed, prior to the actual imprinting by the type bar, and subsequent thereto the ribbon fork must return into its rest position in order to enable a reading of the letter so printed.
  • the high operating speeds to be attained require that the ribbon actuating movement be transmitted to the ribbon fork as positively as possible as at such high operating speeds it is no longer sufficient to merely accelerate the ribbon fork and let it impact without subsequent delayed action, for example against a suitable stop member. Conditions resulting from wear and impact breakdowns thereby occurring prevent a completely safe and dependable shifting from one color strip of ribbon to the other, whereby the desired identification of certain sections of typing by different color of ink cannot be assured. Consequently it is not merely advantageous but necessary to provide a positive drive of the rib bon fork at the high speeds involved.
  • the problem to which the invention is directed thus resides in the development of a device for the positive raising and lowering of the ribbon fork in which only low forces are required to effect the controlling operations, and yet provides a safe and completely dependable shifting of the ribbon fork.
  • the present invention contemplates an apparatus which meets the requirements above set forth, in which a lever pivotal through a constant angular range by suitable drive means, is pivotally coupled over a linkage which includes intermediate levers pivotally connected to each other and to a moveable arm which actuates the ribbon fork, whereby a rigid connection can be selectively established, either between the drive lever pivotal by the drive means and the first intermediate lever of the intermediate levers or between the two intermediate levers of the chain.
  • the lever pivotally actuated by the drive means is rigidly connectable through the intermediate lever pivotally connected therewith to effect a positive locking of such intermediate lever on the pivotal axis of the drive lever.
  • Such intermediate lever preferably is provided with an extension which is disposed at one side of the pivotal axis of the drive lever and cooperable with a blocking lever disposed at the opposite side of such axis which may be selectively pivoted by suitable control means into a position adjacent such pivotal axis, thereby locking the first intermediate lever to the drive lever.
  • the intermediate levers are connected by a pair of coupling links, the pivotal axis of which extend parallel to those of the intermediate levers.
  • a stop member positioned on one of the intermediate levers cooperates with spring means biasing said coupling links, when in extended relation, in an overcenter position in which the two coupling links act as a single member to effect a rigid connection between the two intermediate levers, but if withdrawn from the overcenter position, the two coupling members may pivot without effect on the connection between the intermediate levers.
  • the action of the coupling links is controlled by adjustment or control members which in one setting do not act upon the coupling links whereby they remain in extended position, and in another setting are operable to effect a pivoting between the coupling links and permit pivotal action between the two intermediate members.
  • the present invention thus enables the adjustment of the actuating mechanism for control of the ribbon fork stroke by utilization of very low adjustment forces, but at the same time results in a positive completely dependable stroke regardless of the length thereof, with the change being accomplished merely by change in the lever ratios in the articulated lever chain. Strokes of the ribbon fork of intermediate lengths are completely prevented in the present invention as the shift from one ribbon stroke to the other takes place in a single step without an intermediate range. Disturbances and breakdowns in the typing operations are thus to a very large extent excluded.
  • FIG. I is a perspective view of a simplified presentation of the actuation mechanism for effecting the stroke of a ribbon fork
  • FIGS. 2 and 3 are generally diagrammatic end elevational views of the mechanism of FIG. 1 illustrating changed positions during actuation of the mechanism to effect the smaller of the two possible stroke lengths transmitted to the ribbon fork in which FIG. 2 illustrates the ribbon fork in its lowermost or rest position;
  • FIGS. 4 and 5 are views similar to FIGS. 2 and 3, respectively illustrating changed positions of the mechanism when adjusted for effecting the longer of the two possible adjustments of the strokes to be transmitted to the ribbon fork, in which FIG. 4 illustrates the ribbon fork in its lowermost or rest position.
  • a drive lever 1 in the form of a rocker arm rigidly supported on a drive shaft 2 and actuated by an eccentric, not shown, pivotally supports, on shaft 3', a lever 3 of platelike formation which has rigidly mounted thereon linkage-supporting rods 4 and 5 and a stop rod or pin 6, the levers l and 3 forming the first and second members of the transmission chain.
  • the plate 3 is biased by means of a spring 7 in a counterclockwise direction to bring a stop member 8, formed on the plate, into engagement with the shaft 2, in which position the plate 3 may rotate through the same arcuate range as the drive lever l.
  • a intermediate lever 9 which forms the third member of the chain, and a blocking lever 10, the levers 9 and 10 being freely pivotal on the rod 4 independently of one another.
  • a rod 11 which operatively couples the lever 9 to an arm 12, pivotally supported on a stationary shaft 13, with the ribbon fork 14 being pivotally connected to the lever arm 12.
  • Coupled with the two intermediate levers 3 and 9 are a pair of coupling links 15 and 16 which are pivotally connected by a rod 17, the opposite end of the link 15 being pivotally mounted on the rod 5 and that of the link 16 being pivotally mounted on the rod 18, rigidly connected with the intermediate lever 9.
  • the coupling links 15 and 16 are urged in a direction to move the rod 17 to the right as viewed in FIGS. 2-5 by means of a spring 19, illustrated as being secured at one end to the link 15, with the link 15 engaging the stop rod 6 as clearly illustrated in FIG. 4.
  • FIGS. 2 and 3 The functional connections existing to effect a transmission of the pivotal motion of the rocker drive arm 1 to the ribbon fork 14 whereby the shorter of the two operating strokes is to be effected, is illustrated in FIGS. 2 and 3.
  • the rocker arm 1 is initially rotated by the eccentric, not shown, from driven position A to rest position B, and as the control member 21 has been pivoted into engagement with a stop 23, its extension 22 is disposed in the path of the rod 17, and as a result the coupling links 15 and 16 are pivoted out of their overcenter position (with respect to a line extending between the rods 5 and 18,) illustrated in FIG.
  • FIGS. 4 and 5 illustrate the functional connection utilized to transmit the pivotal motion of the drive rocket arm 1 to the ribbon fork 14, whereby the longer of the two operating strokes is effected.
  • selection of the stroke is effected merely by the positioning of the control member 21 with respect to the rod 17, with the only force required to effect the selection being that required to move the control member 21 from one position to another, which obviously is very low.
  • a drive lever rigidly mounted on a drive shaft, pivotal through a predetermined arcuate range, a pair of intermediate levers operatively connected to the drive lever for pivotal movement relative thereto, first means for selectively establishing a rigid connection between the two intermediate levers, and second means for establishing a rigid connection between the drive lever and one of said intermediate levers when said first means is inoperative, said intermediate levers operatively connecting the drive lever to said ribbon fork.
  • a mechanism according to claim 2, wherein said second means includes an extension provided on said one intermediate lever engageable with said drive shaft at one side thereof, and a blocking lever, pivotal to selectively engage the drive shaft at the opposite side thereof.
  • said first means includes a pair of pivotal coupling links which connect said intermediate levers and are spring biased in an overcenter position in engagement with a stop disposed on one of said intermediate levers, whereby said coupling links may act as a single rigid member connecting said intermediate levers in rigid relation, and a control member selectively engageable with said coupling links to enable movement of said coupling links out of said overcenter position for relative pivotal movement therebetween.
  • said one intermediate lever is pivotally connected at one end thereof with the free end of said drive lever and at its opposite end to the other intermediate lever intermediate the ends thereof, said first means including a pair of coupling links having their adjacent ends pivotally connected, the free end of one of said coupling links being pivotally connected to one end of said other intermediate lever and the free end of the other of said coupling links being pivotally connected to said one intermediate lever intermediate the ends thereof, a stop member thereof, and a blocking lever pivotally connected to said one intermediate lever disposed for pivotal movement to selectively engage said drive shaft at the opposite side thereof to rigidly connect said one intermediate lever thereto, said blocking lever being engageable with means associated with said other intermediate lever when said coupling links are in overcenter position operative to dispose said blocking lever in a nonblocking position.

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  • Impression-Transfer Materials And Handling Thereof (AREA)
US713808A 1967-04-25 1968-03-18 Ribbon fork actuating mechanism for typewriters and the like Expired - Lifetime US3595361A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0109523 1967-04-25

Publications (1)

Publication Number Publication Date
US3595361A true US3595361A (en) 1971-07-27

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Application Number Title Priority Date Filing Date
US713808A Expired - Lifetime US3595361A (en) 1967-04-25 1968-03-18 Ribbon fork actuating mechanism for typewriters and the like

Country Status (6)

Country Link
US (1) US3595361A (enrdf_load_stackoverflow)
JP (1) JPS4831327B1 (enrdf_load_stackoverflow)
BE (1) BE714215A (enrdf_load_stackoverflow)
FR (1) FR1558125A (enrdf_load_stackoverflow)
GB (1) GB1185592A (enrdf_load_stackoverflow)
NL (1) NL6802740A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236839A (en) * 1977-09-26 1980-12-02 Siemens Aktiengesellschaft Device for adjusting the height of a ribbon guide

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1800854A (en) * 1927-04-06 1931-04-14 Barr Morse Corp Typewriter and the like
US3233716A (en) * 1962-04-26 1966-02-08 Grundig Max Ribbon positioning arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1800854A (en) * 1927-04-06 1931-04-14 Barr Morse Corp Typewriter and the like
US3233716A (en) * 1962-04-26 1966-02-08 Grundig Max Ribbon positioning arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236839A (en) * 1977-09-26 1980-12-02 Siemens Aktiengesellschaft Device for adjusting the height of a ribbon guide

Also Published As

Publication number Publication date
FR1558125A (enrdf_load_stackoverflow) 1969-02-21
NL6802740A (enrdf_load_stackoverflow) 1968-10-28
DE1561315B1 (de) 1972-07-13
JPS4831327B1 (enrdf_load_stackoverflow) 1973-09-28
BE714215A (enrdf_load_stackoverflow) 1968-10-25
GB1185592A (en) 1970-03-25

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