US3817365A - Automatic print head shifting device - Google Patents

Automatic print head shifting device Download PDF

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Publication number
US3817365A
US3817365A US00365130A US36513073A US3817365A US 3817365 A US3817365 A US 3817365A US 00365130 A US00365130 A US 00365130A US 36513073 A US36513073 A US 36513073A US 3817365 A US3817365 A US 3817365A
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US
United States
Prior art keywords
carriage
printing
housing
lever
print head
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
US00365130A
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English (en)
Inventor
N Zimmermann
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.)
TA Triumph Adler AG
Original Assignee
Triumph Werke Nuernberg AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Triumph Werke Nuernberg AG filed Critical Triumph Werke Nuernberg AG
Application granted granted Critical
Publication of US3817365A publication Critical patent/US3817365A/en
Assigned to TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INFORMATIONSTECHNIK reassignment TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INFORMATIONSTECHNIK CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE 8/13/80 Assignors: TRIUMPH WERKE NURNBERG AKTIENGESELLSCHAFT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3086—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means between the print head and its carriage
    • 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
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms

Definitions

  • This invention relates to pin matrix printers; more particularly, it relates to an automatically operable shifting device for controlling the spacing between a pin matrix print head and a printing plane, and, specifically, it relates to a shifting device operable to retract the printing head mounted on a movable carriage to an inactive position spaced from the printing plane incident to carriage return movement and to restore the print head to a printing position closely adjacent the printing plane on return of the carriage to a beginning of line position.
  • Pin type print heads because of the short stroke of the pins to effect printing, require that the spacing of the print head from the printing plane be kept uniform to assure even density of print from character to character.
  • Such print heads have been associated with devices for controlling the spacing of the print head from the printing plane according to the thickness of the information bearing record. This has been accomplished by sensing devices, for example, by heads resiliently spring biased toward the printing plane or associated rollers mounted on the printing head which ride against the record and cause the spring biased head to retract according to record thickness sensed by the roller. Sensing devices of this type which bear against the paper interposed between print head and printing plane are apt, atthe high return speeds of the carriage supporting the print head, to damage the paper and/or an inked ribbon and otherwise render illegible printed information.
  • a print head shifting device operable to increase the spacing between print head and printing plane during return movement of a carriage supporting the print head to avoid frictional contact between print head and record.
  • the print head is associated with a spring biased lever acting normally to retract the print head from a normal print position closely adjacent the printing plane.
  • Means are provided to automatically urge said lever against its spring bias and to latch it when a carriage supporting the print head reaches a beginning of line position thereby to hold the print head in print position.
  • means are provided to release the latch incident to a carriage return command issuing when the carriage has moved to a particular print location or on receipt of a prearranged signal following printing of selected information in a line.
  • an object of the invention is to provide an automatic system for varying the spacing between a pin matrix head and a print plane according to the direction of movement of a carriage supporting said print head.
  • Another object of the invention is in the provision of a system for normally releasably holding a print head in printing position closely adjacent a printing. plane during movement of a carriage supporting the print head in a printing direction and for releasing said print head for movement away from said printing plane incident to and over the interval of a carriage return movement to a beginning of line position.
  • FIG. I is an elevational view showing a carriage supported pin matrix print head in a retracted position with the carriage moving in carriage return direction;
  • FIG. 2 is an elevational view similar to FIG. 1 showing the print head in printing position closely adjacent a printing plane after movement of the carriage to a beginning of line position.
  • FIG. 1 a carriage 3 which is supported for movement relative to a printing plane 4 on a pair of parallel guide rails 5 parallel to the printing plane 4.
  • the carriage 3 pivotally supports a lever generally designated by reference numeral 6 as at 7 which has a rightwardly extending arm 8 the end of which is coupled as by a pin 9 to the housing of a pin matrix print head generally designated by reference numeral 11.
  • the lever 6 also has a downwardly extending arm 12 whose end is formed with a latching recess 13 adapted to cooperate with a latching pin l4 on the end of a horizontal latch member or bar 15.
  • the other end of the latch member 15 is pivotally mounted on the carriage as at 16 and a spring 17 connected to an anchor 18 on the print head and to latch member 15 intermediate its ends normally tends to bias the latch member 15 upwardly into engagement with the end of lever arm 12.
  • the lever 6 is normally urged clockwise by a torsion spring 19 wrapped about pivot 7 and having an end coupled to lever arm 12 as at 21.
  • an abutment or pin 22, secured to the lever arm 12 and extending upwardly from the plane of the drawing, will encounter a frame abutment 23 in its path defining a beginning of line or left margin position with the result that the lever 6 will be moved counterclockwise, cam the latch member counterclockwise, and be held by cooperative engagement of the latching pin 14 of the latch member and the latching recess on the end of lever arm 12, as shown in FIG. 2.
  • This movement of the lever 6 against the bias of its spring 19 will move the print head 11 in the direc tion of arrow III (FIG. 2) to print position closely adjacent the printing plane as illustrated in FIG. 2.
  • Printing of a line of characters by pins in the print head may be accomplished with the carriage moving in the direction of arrow IV under control of suitable motive or escapement mechanism.
  • a carriage return command will occur and function to release lever 6 from latch member 15 as by rocking. the latch member counterclockwise about its pivot with the result that the parts will reassume their FIG. 1 position until again the carriage returns to beginning of line position.
  • the carriage return command may be a signal pulse that may be applied to momentarily energize an electromagnet 25 located to attract the latch member directly or through an armature (not shown) and rotate it to release lever 6.
  • the objects of the present invention to regulate the distance between the printing head and the printing counterbearing are achieved by means of simple, readily produced components enabling the distance between the printing head and the printing plane to be increased for the return motion of the carriage so that damage to the information carrier by the print head cannot occur even when the return motion of the carriage takes place at a high rate of speed.
  • the present invention is not limited to the embodiment described and shown in the drawing, modifications being possible within the scope of the idea behind the invention.
  • the latch member instead of the detent pin of the latch member 15, the latch member may be provided with a recess into which the lever arm 12 snaps. It is also possible to design the lever 6 itself so as to perform the function of the pin 22 at the end of lever arm 12.
  • the disengagement of the lever 6 from the latch member 15 may also be triggered by purely mechanical means rather than by the magnet, for instance, in response to the carriage encountering the right margin setter usually present in such printing systems together with an appropriate design of the latch member 15.
  • a pin matrix printer having a printing plane, a pin matrix housing and a carriage supporting said housing mounted for movement relative to said printing plane in writing and carriage return directions,
  • means on said carriage for releasably holding said housing in printing position close to said printing plane to permit pins supported therein to print against a record located in front of said printing plane, said means being operative on release to retract said housing away from said printing plane, other means responsive to a carriage return signal for releasing said holding means,
  • said means on said carriage for releasably holding said matrix housing comprising lever means pivoted on said carriage and connected to said housing, spring means biasing said lever in a direction to retract said housing. and latch means for holding said lever against movement by said spring means.
  • said other means comprising a latch member, a spring biasing said latch member to latching position, and means responsive to movement of said carriage to an end of line position to operate said latch member against its spring bias to release said lever means.
  • said further means including an abutment on said lever means, and a frame stop positioned to engage said abutment when said carriage is returned to force said lever means to latched position.

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US00365130A 1972-08-09 1973-05-30 Automatic print head shifting device Expired - Lifetime US3817365A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2239117A DE2239117C3 (de) 1972-08-09 1972-08-09 Verstellvorrichtung zum Verändern des Abstandes zwischen Druckkopf und Druckwiderlager

Publications (1)

Publication Number Publication Date
US3817365A true US3817365A (en) 1974-06-18

Family

ID=5853093

Family Applications (1)

Application Number Title Priority Date Filing Date
US00365130A Expired - Lifetime US3817365A (en) 1972-08-09 1973-05-30 Automatic print head shifting device

Country Status (3)

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US (1) US3817365A (ja)
JP (1) JPS5321329B2 (ja)
DE (1) DE2239117C3 (ja)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910395A (en) * 1974-03-06 1975-10-07 Ibm Apparatus for print head retraction to facilitate paper insertion
US3949851A (en) * 1975-01-24 1976-04-13 Victor Comptometer Corporation Motion translation means for high speed printer print head
US4023662A (en) * 1974-12-19 1977-05-17 Ing. C. Olivetti & C., S.P.A. Arrangement for adjusting the spacing between a print head and a platen
US4050568A (en) * 1975-12-05 1977-09-27 Sperry Rand Corporation Stylus carriage drive
US4088215A (en) * 1976-12-10 1978-05-09 Ncr Corporation Record media compensation means for printers
FR2370591A1 (fr) * 1976-11-10 1978-06-09 Facit Ab Imprimante rapide a tete d'impression a actionnement pneumatique
US4098389A (en) * 1976-08-20 1978-07-04 Bunker Ramo Corporation Three position platen control mechanism
US4372698A (en) * 1980-03-11 1983-02-08 Akira Matsushima Driving device for a print head of a printer
US4420269A (en) * 1981-03-27 1983-12-13 Triumph-Adler A.G. Fur Buro- Und Informationstechnik Device for lifting the printing head off the platen
US4657415A (en) * 1984-06-12 1987-04-14 Oki Electric Industry Co., Ltd. Mechanism for adjusting the spacing between the print head and platen of a printer
US4738552A (en) * 1985-03-11 1988-04-19 Oki Electric Industry Co., Ltd. Platen gap adjusting mechanism of printer
EP0435695A2 (en) * 1989-12-29 1991-07-03 Canon Kabushiki Kaisha Ink jet recording apparatus
EP0501800A2 (en) * 1991-02-28 1992-09-02 Canon Kabushiki Kaisha Ink jet apparatus
US6672696B2 (en) * 2001-01-31 2004-01-06 Hewlett-Packard Development Company, L.P. Automatic printhead-to-media spacing adjustment system
CN104760429A (zh) * 2015-04-29 2015-07-08 福建实达电脑设备有限公司 一种自动调整打印间隙的印字方法及装置
US20150360542A1 (en) * 2013-01-28 2015-12-17 Thermo King Corporation System and method of distributing airflow in a transport refrigeration unit

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5520518Y2 (ja) * 1975-02-12 1980-05-16
JPS5237942U (ja) * 1975-07-03 1977-03-17
JPS52106920A (en) * 1976-03-04 1977-09-08 Hitachi Koki Kk Printer
JPS5321608A (en) * 1976-08-10 1978-02-28 Nippon Electric Co Automatic printing media thickness sensor
JPS5499712U (ja) * 1977-12-23 1979-07-13
JPS54136011U (ja) * 1978-03-15 1979-09-20
US4222673A (en) * 1978-09-20 1980-09-16 Durango Systems, Inc. Print head carriage assembly for serial printers
JPS55146782A (en) * 1979-05-02 1980-11-15 Hitachi Ltd Shifting method for ink ribbon
SE465665B (sv) * 1990-02-02 1991-10-14 Philips Norden Ab Apparat foer uppteckning och/eller avlaesning av information

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567134A (en) * 1945-08-27 1951-09-04 Stuivenberg Cornelis Hendricus Printing machine controlled by symbol cards
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3145822A (en) * 1960-10-24 1964-08-25 Monroe Calculating Machine Tape actuated movable mechanical writing head
DE1221649B (de) * 1963-04-02 1966-07-28 Standard Elektrik Lorenz Ag Schreibkopf fuer Mosaikdrucker, dessen Aufzeichnungstraeger angefeuchtet ist
US3534847A (en) * 1966-09-21 1970-10-20 Frederick P Willcox High speed teleprinter
US3572238A (en) * 1967-11-15 1971-03-23 Philips Corp Print-head drive
US3596746A (en) * 1968-09-25 1971-08-03 Sagem Multitype wheel printing machine
US3610518A (en) * 1968-10-24 1971-10-05 Diehl Printing device for calculating machines
US3724631A (en) * 1971-01-15 1973-04-03 Printer Technology Inc Printer with helically arranged type divided into axially offset group
US3776340A (en) * 1970-04-24 1973-12-04 Rena Buromaschinenfab Gmbh & C Recording instrument with mosaic printing head

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879876A (en) * 1955-11-17 1959-03-31 Ibm Single element printing machine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567134A (en) * 1945-08-27 1951-09-04 Stuivenberg Cornelis Hendricus Printing machine controlled by symbol cards
US3145822A (en) * 1960-10-24 1964-08-25 Monroe Calculating Machine Tape actuated movable mechanical writing head
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
DE1221649B (de) * 1963-04-02 1966-07-28 Standard Elektrik Lorenz Ag Schreibkopf fuer Mosaikdrucker, dessen Aufzeichnungstraeger angefeuchtet ist
US3534847A (en) * 1966-09-21 1970-10-20 Frederick P Willcox High speed teleprinter
US3572238A (en) * 1967-11-15 1971-03-23 Philips Corp Print-head drive
US3596746A (en) * 1968-09-25 1971-08-03 Sagem Multitype wheel printing machine
US3610518A (en) * 1968-10-24 1971-10-05 Diehl Printing device for calculating machines
US3776340A (en) * 1970-04-24 1973-12-04 Rena Buromaschinenfab Gmbh & C Recording instrument with mosaic printing head
US3724631A (en) * 1971-01-15 1973-04-03 Printer Technology Inc Printer with helically arranged type divided into axially offset group

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910395A (en) * 1974-03-06 1975-10-07 Ibm Apparatus for print head retraction to facilitate paper insertion
US4023662A (en) * 1974-12-19 1977-05-17 Ing. C. Olivetti & C., S.P.A. Arrangement for adjusting the spacing between a print head and a platen
US3949851A (en) * 1975-01-24 1976-04-13 Victor Comptometer Corporation Motion translation means for high speed printer print head
US4050568A (en) * 1975-12-05 1977-09-27 Sperry Rand Corporation Stylus carriage drive
US4098389A (en) * 1976-08-20 1978-07-04 Bunker Ramo Corporation Three position platen control mechanism
FR2370591A1 (fr) * 1976-11-10 1978-06-09 Facit Ab Imprimante rapide a tete d'impression a actionnement pneumatique
US4088215A (en) * 1976-12-10 1978-05-09 Ncr Corporation Record media compensation means for printers
US4372698A (en) * 1980-03-11 1983-02-08 Akira Matsushima Driving device for a print head of a printer
US4420269A (en) * 1981-03-27 1983-12-13 Triumph-Adler A.G. Fur Buro- Und Informationstechnik Device for lifting the printing head off the platen
US4657415A (en) * 1984-06-12 1987-04-14 Oki Electric Industry Co., Ltd. Mechanism for adjusting the spacing between the print head and platen of a printer
US4738552A (en) * 1985-03-11 1988-04-19 Oki Electric Industry Co., Ltd. Platen gap adjusting mechanism of printer
EP0435695A2 (en) * 1989-12-29 1991-07-03 Canon Kabushiki Kaisha Ink jet recording apparatus
EP0435695A3 (en) * 1989-12-29 1991-12-18 Canon Kabushiki Kaisha Ink jet recording apparatus
US5610636A (en) * 1989-12-29 1997-03-11 Canon Kabushiki Kaisha Gap adjusting method and ink jet recording apparatus having gap adjusting mechanism
EP0501800A2 (en) * 1991-02-28 1992-09-02 Canon Kabushiki Kaisha Ink jet apparatus
EP0501800A3 (en) * 1991-02-28 1993-06-09 Canon Kabushiki Kaisha Ink jet apparatus
US5363132A (en) * 1991-02-28 1994-11-08 Canon Kabushiki Kaisha Color ink jet printing apparatus having retractable printheads to prevent nozzle contamination
US6672696B2 (en) * 2001-01-31 2004-01-06 Hewlett-Packard Development Company, L.P. Automatic printhead-to-media spacing adjustment system
US20040056911A1 (en) * 2001-01-31 2004-03-25 Fairchild Michael A. Automatic printhead-to-media spacing adjustment system
US6840598B2 (en) * 2001-01-31 2005-01-11 Hewlett-Packard Development Company, L.P. Automatic printhead-to-media spacing adjustment system
US20150360542A1 (en) * 2013-01-28 2015-12-17 Thermo King Corporation System and method of distributing airflow in a transport refrigeration unit
CN104760429A (zh) * 2015-04-29 2015-07-08 福建实达电脑设备有限公司 一种自动调整打印间隙的印字方法及装置

Also Published As

Publication number Publication date
DE2239117A1 (de) 1974-02-28
JPS5321329B2 (ja) 1978-07-01
JPS4957914A (ja) 1974-06-05
DE2239117C3 (de) 1982-04-01
DE2239117B2 (de) 1976-07-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INF

Free format text: CHANGE OF NAME;ASSIGNOR:TRIUMPH WERKE NURNBERG AKTIENGESELLSCHAFT;REEL/FRAME:003935/0913

Effective date: 19800813