US3905464A - Ribbon change apparatus - Google Patents

Ribbon change apparatus Download PDF

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US3905464A
US3905464A US44470874A US3905464A US 3905464 A US3905464 A US 3905464A US 44470874 A US44470874 A US 44470874A US 3905464 A US3905464 A US 3905464A
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Prior art keywords
vibrator
ribbon
arms
recess
guide
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Thomas E Frechette
Daniel J Rosborg
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Western Atlas Inc
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Litton Business Systems Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J35/00Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/04Ink-ribbon guides

Abstract

A vibrator-ribbon guide connecting structure is provided for facilitating coupling thereto of a ribbon guide through which a ribbon is prethreaded whereby quick and clean ribbon changing may be accomplished. The ribbon guide and vibrator are so associated that the ribbon guide is freely removable from the vibrator when the vibrator is at rest yet is positioned to be elevated and positively retracted by the vibrator during vibrator movement.

Description

United States Patent Frechette et a1.
RIBBON CHANGE APPARATUS inventors: Thomas E. Frechette, Windsor Locks; Daniel J. Rosborg, Bristol, both of Conn.
Litton Business Systems, Inc., New York, N Y.
Filed: Feb. 21, 1974 Appl. No.: 444,708
Assignee:
U.S. Cl 197/170; 197/159 Int. Cl. i B41J 35/04 Field of Search 197/151, 157-159, 197/170, 154
References Cited UNITED STATES PATENTS 8/1941 Johnson 197/170 X 1 Sept. 16, 1975 2,518,893 8/1950 Huether 197/170 2,919,784 1/1960 Morris 197/159 3,302,766 2/1967 Page 197/159 X Primary Examiner-Clifford D. Crowder Assistant Examiner-R. T. Rader Attorney, Agent, or Firm.loseph R. Spalla 5 7 ABSTRACT 10 Claims, 4 Drawing Figures PATENTE SEP 1 5 r975 RIBBON CHANGE APPARATUS This invention relates to ribbon mounting structures for typewriters or like business machines to facilitate ribbon changes; more particularly,- it relates to vibrator elevator structure which is freely receivable within an opening in a ribbon guide mounted on a ribbon; and specifically it relates to a vibrator elevator structure which expands into the'opening in the ribbon guide during operative movement-thereof.
Problems in providing clean quick change of ribbons in typewriters or like machines arise from the fact that the ribbon must be threaded through ribbon guides associated with a vibrator which raises and lowers the ribbon opposite the print point incident to each type action. Various solutions to this problem have been presented including ribbon guides which facilitate the manipulation of a new ribbon into the guide forming part of the vibrator mechanism. Still, even with a nimble operator, quick ribbon changes are not possible. Still other solutions have separated the ribbon guide from the vibrator and prethreaded the ribbon on the ribbon guide. In these structures, the ribbon guide is designed for reception by vibrator elevator structure associated with the machine. U.S. Pat. Nos. 2,252,075 (Johnson); 2,518,893 (Huether); and 2,873,015 (Gray) are exemplary of these prior art solutions. In Huether, the ribbon guide is detentably secured to and removable from the vibrator elevator structure through application of manual force. The application of force may subject the vibrator structure to damage and the repeated insertion of new ribbon guides subject the vibrator structure to wear. In the Johnson and Graypatents, the ribbon guide merely rests on the vibrator structure and after being raised returns by gravity in Gray or by springs in Johnson. 7
In that the vibrator must raise a ribbon opposite the printing line incident to and before a type bar strikes and returns, the ribbon guides of Johnson and Gray are likely to become disengaged from and not follow the movements. of the vibrator structure due to the accelerating forces or friction and not work properly.
In accordance with the present invention, the disadvantages of the prior art are overcome in the provision of a vibrator elevator'structure which is freely receivable in an opening of a ribbon guide structure through which a ribbon is prethreaded to facilitate mounting and removal of the ribbon guide from the vibrator structure without application of force, yet which during elevating and retracting movement of the vibrator elevator structure is engaged with and carried by the vibrator structure. More particularly, a vibrator elevator structure is provided having a ribbon guide coupling end which expands incident to elevating movement to engage the walls of a receiving opening provided in a ribbon guide.
An object of the invention is in the provision of a clean quick change ribbon structure.
Another object of the invention is in the provision of a ribbon guide-vibrator coupling structure to facilitate ribbon changes.
Another object of the invention is in the provision of a ribbon guide-vibrator coupling structure which is freely separable in quiescent state and positively engaged in active state. i
Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawing in which like reference numerals designate like or corresponding parts through the figuresthereof and wherein:
FIG. 1 is an elevational view of a prethreaded ribbon guide operatively associated vibrator elevator structure in restposition;
FIG. 2 is a view similar to FIG. 1 with the parts in elevated position;
FIG. 3 is a perspective view of the vibrator structure;
and I FIG. 4 is a perspective view of another ribbon guide embodiment.
With reference now to the drawing wherein like reference characters designate like or corresponding parts throughout the several views there is shown in FIG. 1 a ribbon 10 prethreaded through a ribbon guide means generally designated by reference numeral 11 adapted to be mounted for vertical elevating movement at a print point location. As will be appreciated by persons skilled in the art, the prethreaded ribbon 10 may be spooled on spools mounted on either side of a printing point, or, alternat ively, on spools located to one side of the machine print point with the ribbon running to the printing point and back via a tum-around prethreaded ribbon guide. In either case, the ribbon guide means 1 1 may be slidably supported in a rigid ribbon guide structure extending to the printing point from the spool location. In the embodiments shown, the ribbon guide means 11 areadapted to be mounted on vibrator structure vertically. With particular reference to FIG. 3, one embodiment of ribbon guide means 11 comprises upwardly extending spaced ribbon guide forks generally designated by reference 12 which may take any form. The guide forks 12 are provided with openin s 13 through which the ribbon 10 is prethreaded. The ribbon forks 12 extend from a common lower end 14 which as best seen in FIG. 1 is provided with a rectangular recess 15 with a restricted opening 16 to the A lower edge 17T defining inwardly directed internal shoulders 18.
, The ribbon guide means in the embodiment shown in FIGS. 1-3, below guide forks 12 is formed with bent out ears 19 which are adapted to embrace and be slidably guided by conventional type guide structure generally designated 21 when the ribbon guide is operatively mounted thereon. The type guide structure 21 is secured to a type bar segment (not shown) as is conventional.
As viewed in FIGS. 13, the ribbon guide means 11, is associated with vibrator elevator means in the form of a rod.22 pivoted in machine side frames (not shown) which is bent to form an eccentric bar 23 parallel to the pivots of the rod 22. As will be understood, the rod 22 will be oscillated, as by a crank (not shown), about its pivots with the result that the eccentric bar 23 will swing through an arc. The vibrator elevator structure further comprises a first vertically extending arm 24 which is secured to the eccentric bar 23 as by wrap around tabs 25 and 26 formed at its lower end with tab 25 wrapped loosely around the bar 23 and tab 26 partially therearound so as to permit limited pivoting movement of the arm 24 with respect to the bar 23. A shouldered pivot pin 27 mounted on arm 24 pivotally secures a second upstanding arm 28 to and forwardly of the first upstanding arm 24. An arm guide bracket 30 supported on part 31 of the typewriter frame is provided which extends upwardly and forwardly with the uppermost forward extension 32 as best seen in FIG. 3 having a guide opening 33. Also extending from the frame part is an upstop 29 located in the path of the eccentric bar. Both arms 24 and 28 extend upwardly through the opening 33 with the face of the forward arm 28 guided by the forward edge 34 of the opening and the rear face of the rear arm 24 by the face 35 of the intermediate upward run 36 of the bracket thus precluding movement of the arms out of a vertical plane. The arms 24 and 28 are also held with their upper oppositely outwardly facing edges 37 and 38 against the side edges 41 of the guide bracket opening 33 by a spring 42 wrapped around the pivot pin 27 having one end 43 bent aboutthe edge of arm 24 and the other end 44 bent around the edges of a lateral projection 45 of the other arm 28. As will be appreciated, the arms 24 and 28 are mounted scissor fashion and biased to an open position by the spring 42. As viewed in FIGS. 1 and 2, left edge of the rear arm 24 immediately below the upper forward slotted extension 32 of the bracket is flared outwardly forming a cam edge 46 and the right edge of the forward arm 28 immediately below the extension 32 is flared outwardly forming a second cam edge 47. Thus, as the vibrator elevator structure is raised, the action of the cam edges 46 and 47 on the side edges 41 of the guide bracket opening 33 pivotally cam the arms toward one another about their pivots. As viewed in FIG. 1, the upper terminal ends of both arms 24 and 28 are freely received by the recess opening 16 and are adapted on elevation to engage the upper wall 48 of the recess to elevate the ribbon guide means 11. The upper ends of the arms 24 and 28 located within the recess are further formed with oppositely facing projections 51 and 52 with the result, as shown in FIG. 2, that when the vibrator structure is elevated the terminal ends are moved toward one another past overlap toward inner side walls of the recess with the projections 51 and 52 overlying the shoulders 18 of the recess opening. Thus, in this expanded crossover state, relative vertical movement between ribbon guide and vibrator arms during elevation of the ribbon guide under push of the vibrator arms is precluded by the interposition of projections 51 and 52 over shoulders 18. The interposition of projections 51 and 52 with shoulders 18 also serve to positively retract or lower the ribbon guide means 1 1. While the terminal upper ends of the arms are shown as extending into the recess, it is also within the scope of the invention to support the ribbon guide as by abutments 53 on the type guide 21 located in the path of ears 19 and to locate the terminal ends of the arms below the recess with initial upward movement moving the terminal ends of the arms first into the recess and then causing their expansion in the recess as hereinbefore described. In such a modification. the cam edges 46 and 47 would be formed lower relative to guide bracket extension 32.
With reference to FIG. 4, there is shown another embodiment of ribbon guide means generally designated by reference 55 preferably of molded plastic couplable to vibrator elevator structure in the same manner as described with reference to FIGS. 1-3. In this embodiment, the ribbon guide means 55 is assembled with, supported by and slidably mountedfor elevating movement within a window opening 56 in ribbon guide structure generally designated by reference 57 rigidly attached to ribbonspool housings located=to either side of a print station. The ribbon guide structure 57 comprises spaced walls 58 and 59 between which a ribbon tracks, with the front side of the front wall 59 provided with formed lugs 62 to'embrace the type guide-whereby the Window opening of guide structure 57 may be located at the machine print point and with the recess opening in the ribbon guide means positioned to receive the vibrator arms 24 and 28.
In this embodiment, slotted ribbon forks designated by reference numerals 63 are integral with the common recessed end 14 adapted to receive the vibrator arms 24 and 28. Both slotted ribbon forks 63have a right angled offset 64 which when assembled with the guide structure rests on the lower edge 65 of the window opening. Each fork 63 further is formed with lugs 66 which when assembled with the guide structure 57 are slidably received between the walls 58 and 59 of the guide structure. Each of the guide forks 63 are formed with offset ribbon accommodating vertical slots 67 and 68 and is also formed with ribbon threading horizontal slots 69.
FIG. 4 shows two guard lugs 70 and 71 located on the ribbon guide structure 57 to either side of the common ribbon fork section 14 which serve to protect the ribbon fork when the assembly is mounted on the machine between the type guide and a platen.
The invention claimed is:
1. In a typewriter having a frame,
a ribbon, I
ribbon guide means through which said ribbon is prethreaded,
vibrator means supported on said frame,
means for elevating said vibrator means, and
means on said guide means and said vibrator means for coupling said guide means and vibrator means when typing,
said means comprising a recess in said guide means and means on said vibrator means freely extendable into said recess and engageable therewith as said vibrator means is elevated when typing.
2. In a typewriter as recited in claim 1, wherein said means extendable into and engageable with said recess comprises at least one arm coupled to said vibrator elevating means, means holding said arm to a position free of said recess, and responsive to elevating movement for effecting engagement of said arm with said recess.
3. In a typewriter as recited in claim 2, wherein said holding means includes a slot through which said arm extends, a spring biasing said arm into engagement with said slot, and cam means on said am cooperative with said slot for moving said arm into engagement with said recess.
4. The typewriter recited in claim 1 wherein said means for elevating said vibrator means is adapted to position said ribbon at a printing line, and wherein said means on said vibrator means freely extendable into said recess engages said recess so that said ribbon is positively retracted from said printing line when said vibrator means is lowered.
5. In a typewriter as recited in claim 4, wherein said means extendable into and engageable with said recess comprises a pair of arms, one of said anns being coupled to the vibrator elevating means, the other of said arms overlying said one arm and pivoted thereto scissor fashion, means to position said arms relative to one another whereby the ends thereof are free to enter said recess in said guide means, and means on said arms and said typewriter frame for moving said arms into engagement with said recess as said vibrator means is raised.
6. A typewriter as recited in claim 5 wherein said means to position said arms relative to one another includes spring means biasing said arms.
7. In a typewriter as recited in claim 6, said means for moving said arm into engagement with the recess comprises cooperating camming surfaces on at least one of said arms and associated with said typewriter frame for moving said arms relative to said frame.
8. A typewriter as recited in claim 7, wherein said cooperative camming surface associated with said frame comprises an edge of a guide slot through which said ribbon guide means to lower said ribbon guide means.

Claims (10)

1. In a typewriter having a frame, a ribbon, ribbon guide means through which said ribbon is prethreaded, vibrator means supported on said frame, means for elevating said vibrator means, and means on said guide means and said vibrator means for coupling said guide means and vibrator means when typing, said means comprising a recess in said guide means and means on said vibrator means freely extendable into said recess and engageable therewith as said vibrator means is elevated when typing.
2. In a typewriter as recited in claim 1, wherein said means extendable into and engageable with said recess comprises at least one arm coupled to said vibrator elevating means, means holding said arm to a position free of said recess, and responsive to elevating movement for effecting engagement of said arm with said recess.
3. In a typewriter as recited in claim 2, wherein said holding means includes a slot through which said arm extends, a spring biasing said arm into engagement with said slot, and cam means on said arm cooperative with said slot for moving said arm into engagement with said recess.
4. The typewriter recited in claim 1 wherein said means for elevating said vibrator means is adapted to position said ribbon at a printing line, and wherein said means on said vibrator means freely extendable into said recess engages said recess so that said ribbon is positively retracted from said printing line when said vibrator means is lowered.
5. In a typewriter as recited in claim 4, wherein said means extendable into and engageable with said recess comprises a pair of arms, one of said arms being coupled to the vibrator elevating means, the other of said arms overlying said one arm and pivoted thereto scissor fashion, means to position said arms relative to one another whereby the ends thereof are free to enter said recess in said guide means, and means on said arms and said typewriter frame for moving said arms into engagement with said recess as said vibrator means is raised.
6. A typewriter as recited in claim 5 wherein said means to position said arms relative to one another includes spring means biasing said arms.
7. In a typewriter as recited in claim 6, said means for moving said arm into engagement with the recess comprises cooperating camming surfaces on at least one of said arms and associated with said typewriter frame for moving said arms relative to said frame.
8. A typewriter as recited in claim 7, wherein said cooperative camming surface associated with said frame comprises an edge of a guide slot through which said arms extend.
9. A typewriter as recited in claim 8, wherein said ribbon guide recess has a restricted opening forming internal shoulders and wherein the ends of said vibrator arms have laterally extending projections engageable with said shoulders operative to lower said ribbon guide means.
10. A typewriter as recited in claim 9 having further cooperative camming surfaces which engage and move said arms to allow said projections on the ends of said arms to thereby engage said shoulders formed on the ribbon guide means to lower said ribbon guide means.
US44470874 1974-02-21 1974-02-21 Ribbon change apparatus Expired - Lifetime US3905464A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2252075A (en) * 1937-06-24 1941-08-12 Johnson Lane Ribbon rack
US2518893A (en) * 1946-07-13 1950-08-15 Charles P Huether Detachable ribbon guide for typewriting machines
US2919784A (en) * 1958-08-04 1960-01-05 Sperry Rand Corp Ribbon vibrator loading means
US3302766A (en) * 1962-09-12 1967-02-07 Royal Typewriter Co Inc Ribbon handling mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2252075A (en) * 1937-06-24 1941-08-12 Johnson Lane Ribbon rack
US2518893A (en) * 1946-07-13 1950-08-15 Charles P Huether Detachable ribbon guide for typewriting machines
US2919784A (en) * 1958-08-04 1960-01-05 Sperry Rand Corp Ribbon vibrator loading means
US3302766A (en) * 1962-09-12 1967-02-07 Royal Typewriter Co Inc Ribbon handling mechanism

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