US3739384A - Self-balancing recorder - Google Patents

Self-balancing recorder Download PDF

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Publication number
US3739384A
US3739384A US00236242A US3739384DA US3739384A US 3739384 A US3739384 A US 3739384A US 00236242 A US00236242 A US 00236242A US 3739384D A US3739384D A US 3739384DA US 3739384 A US3739384 A US 3739384A
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United States
Prior art keywords
pen
assembly
slidewire
chart
cable
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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
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US00236242A
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English (en)
Inventor
S Harkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leeds and Northrup Co
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Leeds and Northrup Co
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Assigned to LEEDS AND NORTHRUP COMPANY reassignment LEEDS AND NORTHRUP COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LEEDS & NOTHRUP COMPANY A CORP. OF PA.
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Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/24—Drives for recording elements and surfaces not covered by G01D5/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/16—Recording elements transferring recording material, e.g. ink, to the recording surface
    • G01D15/18—Nozzles emitting recording material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/12—Recording devices

Definitions

  • ABSTRACT A strip chart recorder of the self-balancing type char- [111 3,739,384 June 12, 1973 acterized by a novel index mounting, pen assembly, and linear slidewire assembly which is movable about a guide shaft for the pen assembly.
  • the pen assembly is comprised of a molded plastic body having a cavity forming an inkwell, integral mounting structure for releasably supporting and precisely positioning a pen in the well, and integral upstanding ears supporting bearings which cooperate with a guide shaft for the pen assembly.
  • the molded plastic body additionally supports electrical contacts of spring material which engage the slidewire and trolley of the movable slidewire assembly and supply pressure for biasing the pen into engagement with the recorder chart.
  • the slidewire contact and pen pressures are simultaneously adjusted by setting the position of the movable slidewire assembly. Means may also be provided for separate adjustment of the pen pressure.
  • the pen assembly additionally has a part cooperating with a portion of the slidewire assembly so that the pen may be lifted regardless of its position across the chart when the slidewire assembly is swung to a pen lift position.
  • the index is mounted on a separate loop of a pen carriage drive cable to avoid tipping the index when the pen is lifted.
  • J. I-Iarkins discloses pen lift mechanism for a strip chart recorder wherein an index is assembled on a'pen carriage in a manner such that it will not move as a result of apen lifting operation. This is accomplished in accordance with applicants invention by utilizing a simple plastic index which snaps onto a loop of drive cable for moving the pen carriage assembly thus avoiding mounting of the index or pointer onthe pen carriage.
  • the pen assembly additionally supports a pen for recording on the recorder chart.
  • means to position the movableframe to move the slidewire against the spring biased slidewire contact structure for developing a fixed biasing force to control slidewire contact pressure and effect rotation of the pen above its guide means to a position for recording on the chart.
  • an integral pen assembly for a recorder is comprised of a body member including an internal cavity for the storage of a supply of ink therein and integral means for cooperation with guide means for the pen assembly for limiting movement thereof to a fixed path.
  • the body member additionally includes means releasably to retain and ac curately position a plug-in pen relative to the body and in ink receiving relation with the internal cavity.
  • an index or pointer member for a selfbalancing recorder of the type having a cable for mov- I ing a pen assembly comprising an integral member including clip structure for fastening the index to the cable.
  • the index member includes a web portion between the clip structure and a pointer portion which separates the clip and pointerportions a distance freely to receive a scale.
  • FIG. 4 is a view similar to FIG. 3 with the parts in position for the pen to be raised from the chart
  • FIG. 5 is a top plan view of applicant's pen assembly
  • FIG. 6 is a sideelevation partly in section taken along I the line 6-6 of FIG. 5,
  • FIG. 1 illustrates the essential parts of an automatic self-balancing strip chart recorder 10.
  • Side plates 11 and 12 are part of a frame the details of which are conventional and therefore not shown.
  • Supported for rota tion in the side plates 11 and 12 is a chart metering roll for advancing a chart 14 in any customary manner.
  • a pen 15 carried by a pen assembly 16 extends into a position overlying the chart for recording thereon.
  • FIG. 2 is a partial perspective of the recorder with parts omitted better to show features of applicants invention.
  • the pen carriage 16 has affixed thereto, as by a screw, a contact support bracket 22.
  • Thiscontact support bracket 22 7 supports a pair of contacts 23 of spring material for contacting a slidewire 24 which is supported on a support plate 27.
  • another pair of contacts 25 of spring material is supported by bracket 22 for engagement with a trolley 26 which is likewise supported on plate 27.
  • a slidewire is part of a measuring circuit of a self-balancing recorder and in operation'a pen assembly is moved along a guide shaft by the recorder balancing motor simultaneously with positioning of a contact along the slidewire until a null condition exists in the measuring circuit thusto-indicate and record the instant value of a measured quantity.
  • the slidewire and trolley elements 24 and 26 supported on plate 27 are in'turn supported on a cross member 28 rigidly affixed to a pair of arms 29 and 31 to form a slidewire frame assembly. While various means may be utilized to fasten the arms 29 and 31 to the cross member 28, a screw through a countersunk hole in each arm into the ends of the cross member 28, such as shown in FIGS. 2-4, will be found satisfactory.
  • the end faces of cross member 28 are parallel so that the arms 29 and 31 are disposed parallel.
  • Each arm has a bushing 32 which serve as bearings for movement of the slidewire frame assembly about the guide rod 17 as a center.
  • Arm 29 has a portion 29A extending to the left as viewed in FIG. 3.
  • This portion has a bent-over tab 293 which overlies an extension 1 1A of sideplate 11.
  • the tab 29B is threaded to receivea knurled adjusting screw 33 which is disposed in alignment with the extension 11A, which serves as a stop upon engagement therewith.
  • a lock nut 34 may be tightened to secure the screw in its adjusted position for reasons later to be described.
  • the slidewire frame assembly is biased in a clockwise direction with respect to rotation about shaft 17 by means of a pen lift lever 36 which pushes'a link 37 connected to arm 29 to force the adjusting screw 33 against the extension 11A of sideplate l l.
  • the lever 36 being retained in the position shown against a stop 368 by an overcenter spring 36A which has an end fixedly related to sideplate 11 in a manner not shown.
  • the slidewire frame assembly comprised of the cross member 28, arms 29 and 31, the plate 27 and the slidewire 24 and trolley 26, as mentioned above, is movable about the guide shaft 17. As mentioned above, it is limited as to how far it may be moved in the clockwise direction around the shaft 17 by means of the knurled adjustment screw 33 which serves as a stop when it contacts the mating portion 11A of frame 11. Counterclockwise rotation of the slidewire frame assembly is limited by engagement of cross member 28 with an adjustable eccentric cam 35 best shown in FIGS. 3 and 4.
  • the range of movement of the slidewire frame assembly between 9 its clockwise and counterclockwise positions is limited by the adjustments of the knurled screw 33 and the eccentric cam 35.
  • the slidewire frame assembly may be moved from the position shown in FIG. 3 to the position shown in FIG. 4 wherein the pen is raised from the chart by an amount which is a function of the clearance between the protrusion 40B and lip 27A, which is dependent upon the position of adjusting screw 33, and the position of the eccentric cam 35. Moving the lever 36 to the position shown in FIG.
  • the support plate. 27 extends upwardly beyond the cross member 28 to form the lip 27A and that the pen assembly 16 has the protrusion 40B which faces lip 27A and which, as seen in FIG. 3, is out of engagement with the lip 27A of support plate 27 by an amount which is a function of the position of adjustment screw 33.
  • spring 38 has been placed under tension and the link 37 is pulled to the right to bias the .slidewireframe assembly against the eccentric cam 35.
  • the lip 27A engages the protrusion 40B and rotates the pen assembly 16 counterclockwise lifting pen l5clear of the chart. From the foregoing it will be evident that no matter what the position of the pen assembly 16 relative to the width of the chart, the lip 27A of the support plate 27 which extends the full width of the chart may engage the protrusion 408 to effect a pen lift operation.
  • the knurled screw 33 serves as an adjustment to control the amount of pressure exerted by the pen 15 on the chart 14. With the lever 36 in the position shown in FIG. 3, pressure is applied to bias the slidewire frame assembly clockwise through link 37. Backing off the adjustment screw 33 will permit the arm 29 to rotate further in the clockwise direction about the shaft 17, thus moving the slidewire 24 and trolley 26 more firmly against the spring contacts 23 and 25 to increase both the slidewire and trolley contact pressure, this in turn tends to rotate the pen assembly 16 clockwise about the guide shaft 17 and increase the pressure of pen on the chart 14. Turning the adjusting screw 33 in the opposite direction so as to cause the slidewire frame assembly to move counterclockwise will reduce slidewire contact pressure and the pressure of the pen 15 on the Y chart 14.
  • the pressure of a pen or other type of marker, on the'chart may be set at a desired positive value or a fixed clearance may be provided between marker and chart. In either case these adjustments are independent of pen-lift operation.
  • the distance from the center of shaft 17 to the average point of engagement of contacts 23 and 24 constitutes the length of a first lever arm and the distance from the center of shaft 17 to the point of engagement of the pen 15 with the chart 14 constitutes'the length of a'second lever arm.
  • Applicant has, for example, used an approximately one-to-one ratio for the lever arms and forv the I contacts 23 and 25 has used contacts obtainable from 1.8. Ney Co., Bloomfield, Connecticut, USA, which are described on pates 49 and 60 of their catalog R-69 as Formed Wire Brushes Type I020, Paliney 7 (heat vtreated) having a basic wire diameter of 0.0l2-inch.
  • the pen assembly includes a body portion which may desirably be made of a transparent or translucent molded plastic such as a selected one of General Electric CO.s LEXAN polycarbonate resins. As best seen in FIG. 6 the body portion has a hollow interior 40K forming an inkwell.
  • the body 40 has integral therewith upstanding ear portions 40A having holes'to receive bushings 39 which are a good slide fit on the shaft 17.
  • Bushings 39 may be made of phosphor bronze, a suitable plastic such as E.I. Du- Pont de NemoursDELRIN, acetal resin or other material having desirable properties for use as a bearing material.
  • the body 40 may have a protrusion 403 (FIG. 6) which may be a molded part thereof and hence integral therewith which cooperates with the lip 27A of the support plate 27 to provide a pen lift function.
  • Each of the upstanding portions 40A may additionally have rearwardly extending ears 40C with a notch 40C into which knotted portions of cable 17A may be captured.
  • the cable 17 is knotted at spaced locations with the knots serving as stops so that an excess length of cable is left between the ears 40C so that together with the spring 178, later to be described, the cable is a continuous loop, hence the pen assembly may be removed without losing ends of the cable.
  • the molded body 40 additionally includes a pair of holes 40D and 40E.
  • the hole 40D is adapted to receive a rubber grommet 41 the center hole of which is a snug pen 15.
  • the hole 40E receives a rubber grommet 42 having molded integral therewith a bulbous portion for priming thepen.
  • the bulb itself may include a vent hole which is covered with an operators finger when the pen is primed or a separate vent hole may be included adjacent the holes 40D and 40E.
  • Another portion of the molded body 40 is an upstanding ear 40G terminating in a thickened portion 40H.
  • the portion 40H has a hole therethrough and a slot 40] which provides a resilient clamp to receive the horizontal portion of the capillary pen 15.
  • the pen 15 is snapped into the slot in this resilient plastic material it is securely held and retained against motion vertically and against rotation with respect to the body 40.
  • the pen 15 is held securely at right angles with respect to the longitudinal axis of the guide shaft 17 and as best seen in FIG. 6 the pen 15 is held securely against vertical motion with respect to the'body 40 and with respect to the longitudinal axis of the guide shaft 17.
  • the writing tip 15A of pen 15 is supported in a sleeve 15B which is removable to permit changing the writing tip.
  • a sapphire writing tip was employed which requires a pen pressure in excess of 15 grams.
  • a felt tip which sembly 16 may include a spring 40L with a slide 40M of low friction material to engage and move along member 28 and apply a-force in opposition to that of spring contacts 23 and 25.
  • the body 40 may include an inwardly extending threaded boss 40N for supporting the spring 40L as by a capscrew 40?.
  • the rider 40M may be mounted on a threaded adjusting screw not shown to provide a fine adjustment for the reduced pen pressure.
  • the member 28 may support a retransmitting slidewire in this location and the slide 40M may comprise spring contact structure for engagement therewith.
  • the structures described enable one skilled in the art by selection of contact spring configurations. and materials, the distances-between the center of shaft 17 and the points of engagement of the contacts 23 and 25 with the slidewire and trolley and the writing tip of pen with the chart, and the material and dimensions of spring 40L to obtain slidewire contact and pen or other marker pressures or spacing over a wide range and accurately control them during recording and pen lift operations.
  • FIG. 7 It is another feature of applicants invention, as best shown in FIG. 7, to so mount an index relative to the pen 15 so that there will be no interaction between the two when the pen is lifted. It has been customary in prior art recorders to mount an indicator on the pen carriage in a manner shown, for example, in US. Pat. No. 2,113,748. Mounting an indicator on the pen carriage in a manner such that it moves when a pen is raised or lowered with respect to writing engagement on the chart causes the pen to move relative to a fixed scale in a manner such as to introduce a parallax error when reading the relationship between pointer and scale. In FIG. 7 there is shown a stringing arrangement for the cable 17A wherein there is provided an extra loop of cable on which may be mounted separately and apart from the pen assembly the indicator 20.
  • the cable 17A has a pair of knots 17C, only one of which shows in FIG. 7, between which there is a slack portion 17D.
  • the cable 17A With the cable secured as shown in FIGS. 2 and 6 in the grooves 40C in the ears 40C of the pen body 40, the cable 17A, due to the action of a tension spring 178, forms a continuous closed loop securely fastened to the pen assembly 16.
  • reference numbers have been applied to the various strands of cable 17A as well as to the pulleys around which the cable is passed.
  • 65 Index 20 is comprised of a molded element which may be made of a colored resilient plastic such as one of the General Electric Co.s
  • An upstanding portion 20A of the molded plastic part has a shape similar to an inverted T.
  • a U-shaped part 20C At the top of the T-shaped portion is a U-shaped part 20C with the legs of the U-spaced apart a distance freely to pass element 55 of cable 17A.
  • the T-shaped portion extends upwardly from a flat bottom portion 20D which has an upwardly projecting pointer portion 20E. The width of the flat bottom web portion between the upstanding T and the pointer is sufficient freely to accommodate a scale interposed between the pointer and the T-shaped portion.
  • the index 20 is secured to cable element 57 by snapping the close fitting clips 20B onto the cable with the index portion 20E positioned in line with the pen 15.
  • the upper U-shaped element which straddles the cable element 55 merely serves to steady the index in an upright position, and as best shown in FIG. 1 the scale fits freely between the upstanding portion 20A and 20E shown in FIG. 8.
  • th index will move back-and-forth in alignment with the pen 15, however the pen 15 may be raised or lowered without in any way affecting the position of the index 20.
  • a self-balancing recorder including a chart and drive means therefore and a pen assembly and guide means therefore, with the improvement comprising:
  • a movable frame supporting a slidewire parallel to said guide means for said pen assembly, said pen assembly being rotatable with respect to its guide means and supporting spring biased slidewire contact structure for engagement with said slidewire and a pen for recording on said chart, and
  • a self-balancing recorder according to claim 1 wherein an adjustable stop is provided to limit movement of said movable frame to control the pressure of said pen on said chart.
  • a self-balancing recorder according to claim I wherein said guide means for said pen assembly is a round shaft about the longitudinal axis of which both said pen assembly and said movable frame rotate.
  • a self-balancing recorder according to claim 1 wherein said pen assembly is comprised of an integral body member including:
  • a self-balancing recorder according to claim 4 wherein the integral body member of said pen assembly additionally includes spaced apart slotted structures for reception of a length of cable and cable stops for moving said pen assembly relative to said chart.
  • a self-balancing recorder according to claim 4 wherein the integral body member of said pen assembly additionally includes means to support a spring mounted slider for engagement with an element of said movable frame disposed parallel to said slidewire.
  • a self-balancing recorder according to claim 1 wherein said pen assembly additionally supports spring means for application of a force on said slidewire assembly in opposition to that of said spring biased slidewire contact structure for reduction of the pressure of said pen on said chart.
  • a self-balancing recorder including a cable for moving said pen assembly along said guide means therefor and an index attached to a loop of said cable for movement in alignment and together with said pen of said pen assembly.
  • a self-balancing recorder according to claim 1 wherein said movable frame includes lip structure and said pen assembly includes means cooperating with said lip structure to oppose the spring bias of said slidewire contact structure.
  • a self-balancing recorder according to claim 9 wherein said means to position said movable frame includes mean to move said movable frame in a direction causing said lip structure to push against said means cooperating with said lip structure to raise said pen from the chart.
  • a self-balancing recorder according to claim I wherein said pen assembly additionally supports a spring biased slider for engagement with an element of said movable frame supporting a slidewire parallel to said guide means for said pen assembly, said spring biased slider exerting a force in opposition to that of said spring biased slidewire contact structure.
  • An inkwell, for recorder pen assembly comprised of molded plastic forming wall structure of a supply of ink therein, a portion of said plastic projecting outwardly from said wall structure for cooperation with guide means for limiting movement of said body member to a fixed path relative to a recorder chart, said wall structure of molded plastic including one of more portions for receiving and supporting a plug-in pen, and a portion of said molded plastic projecting outwardly from said wall structure forming a resilient clamp to receive a pen portion releasably to retain and accurately position a plug-in pen relative to said body member in ink recieving relation with said internal cavity and prevent rotation of said pen with respect to said body.
  • An inkw'elLfor a recorder having means releasably to retain a plug-in pen in said well comprising support means in the top of said well in alignment with support means in a protrusion extending internally into said well, and an ear portion including a pen engaging slot securely to hold a pen in vertical alignment in said support means and against rotation about an axis defined by a linethrough the centers of said support means.
  • An inkwell for a recorder pen assembly, comprised of molded plastic forming wall structure of a body member including an internal cavity for the storage of a supply of ink therein, portions of said plastic projecting outwardly from said wall structure and forming a pair of spaced apart ear portions having aligned holes for cooperation with a guide rod for limiting movement of said body member to a fixed path relative to a recorder chart, said wall structure of molded plastic including means for supporting a plug-in pen in ink receiving relation with said internal cavity, and a portion of said molded plastic projecting outwardly from said wall structure and having a pen engaging portion providing means releasably to retain and accurately position a plug-in pen relative to said body member.
  • An index member for a self-balancing recorder of the type having a cable for moving a marker assembly comprising an integral member including clip structure for fastening said index to a cable, a web portion having said clip structure associated with one edge of said web portion and a pointer portion associated with the other edge of said web portion and with the width of said web separating said clip portion and said pointer portion a distance to receive a scale.
  • a marker assembly for a self balancing recorder of the type having a cable for moving the marker assembly, said assembly including a pair of spaced apart slotted elements for reception therebetween of an element of said cable having a pair of cable stops separated by a distance greater than that between said spaced apart slotted elements thereby to permit separa tion of said cable from said marker assembly without losing ends of cable.
  • a self-balancing recorder including a chart and drive means therefore, a marker assembly and guide means therefore, and a cable actuated by a balancing motor to move said marker assembly relative to said chart with the improvement comprising:
  • said cable including stop structure spaced along the length thereof a distance greater than that between said spaced apart slotted elements, and cable tensioning means f0 holding said cable with said stop structure against said slotted elements.
  • a self-balancing recorder including a chart and drive means therefore and a marker assembly and guide means therefore with the improvement comprismg:
  • a movable frame swingable about the guide means for said marker assembly, said movable frame supporting a slidewire parallel to said guide means, said marker assembly being rotatable with respect to said guide means and supporting; spring biased slidewire contact structure for engagement with said slidewire, marking means for recording on said chart, and a marker lift element for cooperation with said movable frame, and spring controlled marker lift means in one position applying a force to said movable frame to press said extent of movement of said movable frame toward said spring biased slidewire contact structure for regulation of the pressure of the contacts on the slidewire and the pressure of the marker on the chart.
  • a self-balancing recorder according to claim 19 wherein an adjustable stop is provided for limiting the distance that the marker may be lifted from the chart.
US00236242A 1972-03-20 1972-03-20 Self-balancing recorder Expired - Lifetime US3739384A (en)

Applications Claiming Priority (1)

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US23624272A 1972-03-20 1972-03-20

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US3739384A true US3739384A (en) 1973-06-12

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US00236242A Expired - Lifetime US3739384A (en) 1972-03-20 1972-03-20 Self-balancing recorder

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US (1) US3739384A (de)
JP (1) JPS498264A (de)
CA (1) CA969152A (de)
FR (1) FR2177347A5 (de)
GB (1) GB1382374A (de)
IT (1) IT981485B (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877035A (en) * 1974-02-01 1975-04-08 Leeds & Northrup Co Event marker for graphic recorder
US4000494A (en) * 1975-05-23 1976-12-28 Honeywell Inc. Printing apparatus for multipoint recorder
US4017871A (en) * 1976-02-09 1977-04-12 Graphic Controls Corporation Marker with three phase ink circuit
DE2723710A1 (de) * 1977-05-26 1978-11-30 Kienzle Apparate Gmbh Registrieranordnung fuer geschwindigkeitsregistriergeraete
DE2738708A1 (de) * 1977-08-27 1979-03-08 Kienzle Apparate Gmbh Registrieranordnung fuer geschwindigkeitsregistriergeraete
FR2422145A1 (fr) * 1978-04-03 1979-11-02 Enertec Enregistreur avec indication de la grandeur en cours d'enregistrement
US4227219A (en) * 1977-09-23 1980-10-07 Ricoh Company, Ltd. Carriage guide mechanism for use in scanning device
US4233609A (en) * 1978-06-07 1980-11-11 Graphic Controls Corporation Disposable instrument pen with integral spring member
US4306244A (en) * 1977-05-26 1981-12-15 Kienzle Apparate Gmbh Speed recording device
US4306245A (en) * 1978-09-21 1981-12-15 Canon Kabushiki Kaisha Liquid jet device with cleaning protective means
DE3041195A1 (de) * 1980-11-03 1982-06-09 Eckardt Ag, 7000 Stuttgart Registriervorrichtung fuer senkrechtregistrierende geraete

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146058A (en) * 1961-07-06 1964-08-25 Esterline Angus Instr Company Recording pen and ink supply system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146058A (en) * 1961-07-06 1964-08-25 Esterline Angus Instr Company Recording pen and ink supply system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877035A (en) * 1974-02-01 1975-04-08 Leeds & Northrup Co Event marker for graphic recorder
US4000494A (en) * 1975-05-23 1976-12-28 Honeywell Inc. Printing apparatus for multipoint recorder
US4017871A (en) * 1976-02-09 1977-04-12 Graphic Controls Corporation Marker with three phase ink circuit
DE2723710A1 (de) * 1977-05-26 1978-11-30 Kienzle Apparate Gmbh Registrieranordnung fuer geschwindigkeitsregistriergeraete
US4306244A (en) * 1977-05-26 1981-12-15 Kienzle Apparate Gmbh Speed recording device
DE2738708A1 (de) * 1977-08-27 1979-03-08 Kienzle Apparate Gmbh Registrieranordnung fuer geschwindigkeitsregistriergeraete
US4227219A (en) * 1977-09-23 1980-10-07 Ricoh Company, Ltd. Carriage guide mechanism for use in scanning device
FR2422145A1 (fr) * 1978-04-03 1979-11-02 Enertec Enregistreur avec indication de la grandeur en cours d'enregistrement
US4233609A (en) * 1978-06-07 1980-11-11 Graphic Controls Corporation Disposable instrument pen with integral spring member
US4306245A (en) * 1978-09-21 1981-12-15 Canon Kabushiki Kaisha Liquid jet device with cleaning protective means
DE3041195A1 (de) * 1980-11-03 1982-06-09 Eckardt Ag, 7000 Stuttgart Registriervorrichtung fuer senkrechtregistrierende geraete

Also Published As

Publication number Publication date
CA969152A (en) 1975-06-10
FR2177347A5 (de) 1973-11-02
JPS498264A (de) 1974-01-24
IT981485B (it) 1974-10-10
DE2313883A1 (de) 1973-10-04
AU5351973A (en) 1974-09-26
DE2313883B2 (de) 1975-12-11
GB1382374A (en) 1975-01-29

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AS Assignment

Owner name: LEEDS AND NORTHRUP COMPANY, PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEEDS & NOTHRUP COMPANY A CORP. OF PA.;REEL/FRAME:004060/0224

Effective date: 19780929

Owner name: LEEDS AND NORTHRUP COMPANY A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LEEDS & NOTHRUP COMPANY A CORP. OF PA.;REEL/FRAME:004060/0224

Effective date: 19780929