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Publication numberUS3872960 A
Publication typeGrant
Publication dateMar 25, 1975
Filing dateFeb 25, 1972
Priority dateFeb 25, 1972
Also published asCA980708A1, DE2306036A1
Publication numberUS 3872960 A, US 3872960A, US-A-3872960, US3872960 A, US3872960A
InventorsAndrew Gabor
Original AssigneeXerox Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
High-speed printer with drift compensated cable for carriage
US 3872960 A
Abstract
A high speed printer in which the carriage carrying a printing wheel is coupled to a servo controlled driving motor having intermittent motion. The motor drives a helically grooved pulley which has attached to it left and right cable segments of equal length. The other ends of the cable segments are attached to the movable carriage. During movement of the carriage the total length of each cable segment remains constant and equal and provides protection against temporary mechanical drift.
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Description  (OCR text may contain errors)

tlnited ttes atent 1191 1111 3,872,960 Gabor Mar. 25, 1975 HlGH-SPEED PRINTER WITH DRIFT 3,011,034 11/1961 Lzlvianzl et a1. 74/8922 x COMPENSATED CABLE FOR CARRIAGE 3,044,312 7/1962 3,168,182 2/1965 Bernard et a1. 197/49 Inventor: Andrew Gabor, lle, 0111f. 3,273,408 9/1966 Nagel et 111 74/8922 x [73] AssigneeZ Xerox Corporation, Stamford, 3,374,873 3/1968 Takenaka 197/49 Conn. I Primary E.\'aml'ner-Edgar S. Burr [2'2] F1led: Feb. 25, 1972 [21] Appl. No: 229,397 [57] ABSTRACT A high speed printer in which the carriage carrying a [52] Cl 197/531 74/892 197/555 printing wheel is coupled to a servo controlled driving 197/601 {97/82 motor having intermittent motion. The motor drives a [51] Int. Ll B411 l/54 helically groove-d pulley which has attached to i left [58 Fleld 01 Search 197/49, 53, 55, 18, 60, and right Cable segments of equal length. The other 197/82? 74/1071 89-22 ends of the cable segments are attached to the mov able carriage. During movement of the carriage the [561 References cued total length of each cable segment remains constant UNITED STATES PATENTS and equal and provides protection against temporary 2,757,775 8/1956 Hickerson 197 49 hanical drift. 2,831,424 4/1958 MacDonald 1 197/49 X 2,859,629 11/1958 Parker et a1. 197/49 x Clams 5 Drawmg Flgures PATENTEI] HARE 5 I975 H V Exmanna am HIGH-SPEED PRINTER WITH DRIFT COMPENSATED CABLE FOR CARRIAGE BACKGROUND OF THE INVENTION The present invention is directed to a high-speed printer with a drift compensated cable for driving a carriage.

In printing devices of, for example, the Teletype or IBM Selectric type, it is necessary to convert the rotary motion of a drive shaft of a motor to linear carriage motion. One solution is a lead screw. This must be made heavy to avoid windup and thus presents a high inertia to the system.

Cables and belts have also been used. These are normally unsuitable when the carriage is intermittently moved with high acceleration and deceleration because of the resultant mechanical drift which causes misregistration.

OBJECT AND SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a drift compensated cable for use in driving the carriage of a high-speed printer.

In accordance with the above object there is provided a high-speed printer for printing on a record medium comprising a movable carriage for carrying a printing unit along a predetermined line of printing with respect to the record medium. Means for intermittently transporting the carriage and printing unit to stationary printing positions along the line of printing is provided. The carriage is movable from a center position to extreme left and right positions. The transporting means includes a motor. Pulley means are driven by the motor. Cable means couple the pulley means to the carriage, The cable means are divided into two segments of equal length, each of the segments having an end affixed to the pulley means. The pulley means have peripheral wrapping surfaces for wrapping equal lengths of the two segments on said surfaces when the carriage is in the center position. The pulley means respectively accommodate a substantially greater length of one segment than the other when the carriage is is one of the extreme positions.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a printer embodying the present invention;

FIG. 2 is a perspective view of the cable drive portion of FIG. 1;

FIG. 3 is an enlarged plan view of a pulley of FIG. 2;

FIG. 4 is an enlarged cross-sectional view of a portion of FIG. 2; and

FIG. 5 is an enlarged view of another portion of FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIG. 1, an overall plan view of the printer of the present invention is illustrated which is contained within a frame 10. The printer includes a platen or roller 11 which carries the paper or record medium. This is printed upon by a print wheel 12 carried by carriage 13. Print wheel 12 is of the type having a number of radially extending spokes with the type element being on the periphery of the spokes. Printing occurs when a hammer 14 impacts the particular type element which has been previously positioned. Details of printing wheel 12 and its operation are disclosed and claimed in a copending application entitled High Speed Printer with Intermittent Print Wheel and Car riage Movement, Ser. No. 229,314, filed Feb. 25, 1972, now abandoned, in the name of Andrew Gabor and assigned to the present assignee.

Printing wheel 12 is carried along a predetermined line of printing along platen 11 by carriage 13. The carriage itself is mounted for linear movement on rods 16 and 17. The carriage includes a ribbon cartridge 18, which has an inked ribbon l9 driven by a stepping motor 21, and a vertical paper feed assembly 20.

Carriage 13 is intermittently transported to various stationary printing positions along the line of printing by a motor 22. This motor is actually part of a servo control system; mounted on its shaft 15 is a rotary disc 23 adjacent a fixed disc 24. As discussed in the above copending application a series of radial parallel metal conductors are present on the discs and provide position signals for the servo system.

A pulley 26 is also mounted on shaft 15. Motor 22 drives carriage 13 by cable means indicated generally as 27. This includes a left segment 28 and a right segment 29. The motor in conjunction with the pulley and cable segments serve to transport the carriage from a center position in which it is now shown to extreme left and right printing positions.

Referring now to FIG. 2, the cables are coupled to carriage 13 through a pulley arrangement 31 which is mounted on an axle 32 which in turn is mounted for rotation on carriage 13. Cable segments 28 and 29 are .wrapped around the two grooves of pulley 31 in oppo site directions as illustrated with their remaining free ends coupled to the frame 10; in the case of segment 28 to resilient fastener 33, and in the case of segment 29 fixed fastener '34. Fastener 33 is illustrated in greater detail in FIG. 4 and includes a sleeve 36 which is resiliently biased against frame 10 by a spring 37. In the case of segment 29 and fastening 34 as illustrated in FIG. 5, there is a fixed fastening to frame 10. Spring 37 provides for the takeup of any slack in either of the cables which might occur due to long term temperature drift. While such long term drift does not have the effect of shifting the registration of printing positions one with respect to the other, it may occur uniformly across the entire line ofprinting. Cable segments 28 and 29 are changed in direction by the idler pulleys 38 in the case of segment 28 and pulleys 39 in the case of cable segment 29, both of which are affixed to frame 10 as best shown in FIG. 1.

Although the pulley arrangement 31 is believed to be a preferable method of attaching the cable segments 28 and 29, it would, of course, also be possible to permanently attach the cable segments directly to the carriage.

As is more clearly illustrated in FIG. 3 pulley 26 has a helically grooved rim around which the cable segments 28 and 29 are wrapped. An end of cable segment 29 is affixed to the rim at point 41 as shown in FIG. 3 and the end of cable segment 28 is affixed to the rim at point 42. The cable, as illustrated with the carriage 13 in its center position, has equal lengths of each segment in the grooves of the pulley. This is necessarily so if the entire lengths of the cable segments 28 and 29 are to be equal. As the carriage is driven, as illustrated by the arrows in FIG. 2, to either the left or right extreme positions, a substantially greater length of one segment than the other will be accommodated or wrapped about pulley 26.

The provision of equal length cable segments and the details of the foregoing mounting or coupling of the carriage to the motor 22 provide for a compensation of 5 temporary mechanical drift due to, for example, the stretching of the cable caused by the intermittent motion of the carriage. With the high speeds and high accelerations and decelerations obtainable by the servo system used in conjunction with the present invention this is especially critical.

1 claim:

1. A high-speed printer for printing on a record medium comprising; a movable carriage for carrying a printing unit along a predetermined line of printing with respect to said record medium said carriage including first pulley means mounted for rotation on an axle mounted for rotation on said carriage; means for intermittently transporting said carriage and said printing unit to stationary printing positions along said line of printing, said carriage being movable from a center position to extreme left and right positions, such transporting means including a motor, second pulley means driven by said motor; a frame for accommodating said carriage and motor; cable means coupling said second pulley means to said carriage, said cable means being divided into two segments of equal length each of said segments having an end affixed to said second pulley means, said second pulley means having peripheral wrapping surfaces for wrapping equal lengths of said two segments on said surfaces when said carriage is in said center position, and for respectively accommodating a substantially greater length of one segment than the other when said carriage is in one of said extreme positions said two segments being respectively wrapped around such pulley means in opposite directions, the other ends of said two segments being affixed to said frame, at least one of said ends being affixed to said frame by resilient means biased to provide a continuous tension in said cable segments.

2. An arrangement for positioning a printing unit at predetermined lateral printing positions relative to a recording medium in a high speed'printer comprising, a frame arrangement associated with said high speed printer, a carriage member for supporting said printing unit in operative relationship to said recording medium, means operatively associated with said carriage member and said frame arrangement for defining a path of travel of said printing unit in a substantially lateral direction reative to said recording medium, a motor supported in fixed relationship relative to said frame arrangement, a first pulley member rotatably supported on said carriage member and adapted for movement with said carriage member in said lateral direction relative to said recording medium, a second pulley member drivingly connected to the output shaft of said motor, a first length of cable fixed at one end thereof to said second pulley member and at the other end thereof to said frame arrangement, said first length of cable being operatively entrained about said first pulley member for transporting said carriage member and said printing unit to one lateral extreme of said recording medium when said motor is driven in a first direction of rotation, a second length of cable substantially equal in length to said first length fixed at one end thereof to said second pulley member and at the other end thereof to said frame arrangement said second length of cable being operatively entrained about said first pulley member for transporting said carriage member and said printing unit to the other lateral extreme of said recording medium when said motor is driven in a second direction of rotation, and means for energizing said motor in predetermined directions of intermittent rotation for reducing the effective length in one of said lengths of cable between said second pulley member and said frame arrangement and for correspondingly increasing the effective length in the other end of said lengths of cable between said second pulley member and said frame arrangement for producing a proportional movement of said carriage member and said print member in said lateral direction.

3. Apparatus according to claim 2 wherein, said second pulley member includes surfaces for peripherally wrapping said equal lengths of said first and said second lengths of cable when said print member is in a substantially central lateral position and for respectively accommodating a substantially greater length of one segment than the other when said print member is in one of said extreme positions.

4. Apparatus according to claim 2 further including, spring means for resiliently connecting at least one of the ends of said lengths of said cable to said frame arrangement for maintaining a continuous tension in each of said lengths of said cable.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2757775 *Jan 19, 1953Aug 7, 1956IbmSingle printing element typewriter
US2831424 *Mar 1, 1954Apr 22, 1958Burroughs CorpTraveling type carriage in high speed printers
US2859629 *Apr 28, 1955Nov 11, 1958Jr Benjamin H MattesonDifferential cable drive mechanism
US3011034 *Mar 20, 1957Nov 28, 1961Gen Motors CorpLinear scale timer
US3044312 *May 20, 1960Jul 17, 1962Curtiss Wright CorpMechanism for converting rotary to linear movement
US3168182 *Mar 21, 1963Feb 2, 1965David W BernardType wheel shifting and impacting means in high speed printers
US3273408 *Dec 3, 1964Sep 20, 1966Pneumafil CorpDrive apparatus for a carriage movable upon a guide
US3374873 *Feb 17, 1964Mar 26, 1968Codamite CorpPrinting apparatus employing bidirectional stepping motors to position type member
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3908809 *Dec 30, 1974Sep 30, 1975IbmHigh speed printer
US4053043 *Dec 29, 1975Oct 11, 1977Xerox CorporationMeans and method for enhancing ribbon lift
US4066160 *Mar 17, 1976Jan 3, 1978Lee Kuo LiangSingle element imprinting assembly with inertially and kinematically independent motion controls
US4116568 *Apr 4, 1977Sep 26, 1978Ricoh Co., Ltd.Carriage driving mechanism for printer
US4149810 *Jan 16, 1978Apr 17, 1979"Meci" Material Electrique de Controle et IndustrielCarriage return device
US4203680 *Jul 10, 1978May 20, 1980Xerox CorporationHigh-speed printer with self-adjusting cable preload mechanism
US4208141 *Sep 19, 1978Jun 17, 1980Xerox CorporationSerial printer with cable tensioning apparatus
US4231674 *Mar 28, 1979Nov 4, 1980Xerox CorporationClip for attaching guide rails to a frame
US4303347 *Mar 31, 1980Dec 1, 1981Autelca AgMatrix printer carriage arrangement
US4353262 *Jun 10, 1981Oct 12, 1982Mannesmann Tally CorporationRotary/linear shuttle mechanism
US4368647 *Jul 15, 1980Jan 18, 1983Konishiroku Photo Industry Co., Ltd.Reciprocating driving device
US4468144 *Jun 9, 1982Aug 28, 1984Contitronix, Inc.Detachable carriage assembly for printer
US4498792 *Apr 9, 1982Feb 12, 1985Ing. C. Olivetti & C., S.P.A.Printing and/or correcting device for printing machines
US4526050 *Jan 4, 1982Jul 2, 1985Motorola, Inc.Self-tensioning differential capstan cable drive mechanism
US4534664 *Apr 22, 1983Aug 13, 1985Silver Seiko Ltd.Printing mechanism having a plurality of type plates
US4591969 *Aug 11, 1983May 27, 1986International Business Machines CorporationMicroprocessor-controlled positioning system
US4626650 *Jun 15, 1984Dec 2, 1986Cybermation, Inc.Two-axis cutting machine using a plasma arc torch or the like
US4711591 *Feb 10, 1986Dec 8, 1987Canon Kabushiki KaishaPrinter for printing by ink transfer
US4927537 *Mar 9, 1989May 22, 1990Envirotech CorporationTape drive with self-expanding coils for sludge collector
US4976556 *Jan 9, 1989Dec 11, 1990Smith Corona CorporationPrint carrier rack drive
US4986141 *Mar 9, 1990Jan 22, 1991Baker Hughes IncorporatedTape drive with self-expanding coils for sludge collector
US4986915 *Mar 9, 1990Jan 22, 1991Baker Hughes IncorporatedTape drive with self-expanding coils for sludge collector
US5149057 *Mar 9, 1990Sep 22, 1992Baker Hughes IncorporatedTape drive with self-expanding coils for sludge collector
US5331862 *Oct 30, 1992Jul 26, 1994Erno Raumfahrttechnik GmbhLinear drive for converting a rotational drive movement into a linear output movement
US5655727 *May 18, 1995Aug 12, 1997Meurer Research, Inc.Sludge collector method and drive with shared reel for taking up and paying out cables
US7314572Feb 14, 2006Jan 1, 2008Meurer Research, Inc.Low-angle fluid flow path alongside a still low-angle sludge collection zone; sludge rapidly settles into the collection zone where a transversely-movable pusher pushes the settled particles out of the collection zone without crossing the fluid flow path.
US7560035Jun 22, 2007Jul 14, 2009Charles Lonnie MeurerOverhead trough with constant trough flow velocity configuration and methods of regulating trough flow velocity
US7718076Feb 14, 2006May 18, 2010Charles Lonnie MeurerMethods of and common gantry drive for single-pass cleaning of multiple stages of a material separation and removal system
US7780015Aug 24, 2006Aug 24, 2010Meurer Research, Inc.Methods of and sludge collector with adjacent opposed oppositely-moving blades for moving sludge in a basin
US7981302Aug 24, 2010Jul 19, 2011Meurer Research Inc.Method and apparatus for enhanced settling and collection of settled material
US8074810Aug 24, 2010Dec 13, 2011Meurer Research, Inc.Methods of and sludge collector with adjacent opposed oppositely-moving blades for moving sludge in a basin
US8516913Apr 14, 2010Aug 27, 2013Timothy John JonesActuator
US20070089557 *Dec 15, 2006Apr 26, 2007Solomon Todd RMulti-ply strap drive trains for robotic arms
US20130239735 *May 8, 2013Sep 19, 2013Intuitive Surgical Operations, Inc.Multi-Ply Strap Drive Trains for Robotic Arms
DE2715244A1 *Apr 5, 1977Oct 13, 1977Ricoh KkAntriebseinrichtung fuer einen wagen eines druckers
EP0048806A1 *Aug 5, 1981Apr 7, 1982International Business Machines CorporationStepper motor load tuning
EP0743276A2 *May 13, 1996Nov 20, 1996Meurer Research, Inc.Drive with shared reel for taking up and paying out cables
Classifications
U.S. Classification400/335, 400/320, 400/225, 400/322, 400/208, 400/902, 400/568, 74/89.22
International ClassificationB41J19/20, B41J1/30
Cooperative ClassificationY10S400/902, B41J19/20
European ClassificationB41J19/20