US3656818A - Self-damped guide rail - Google Patents

Self-damped guide rail Download PDF

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Publication number
US3656818A
US3656818A US35717A US3656818DA US3656818A US 3656818 A US3656818 A US 3656818A US 35717 A US35717 A US 35717A US 3656818D A US3656818D A US 3656818DA US 3656818 A US3656818 A US 3656818A
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US
United States
Prior art keywords
recess
guide
printing head
bar
printing
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
US35717A
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English (en)
Inventor
Vincent E Bischoff
Paul S Colecchi
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.)
AB Dick Co
Videojet Technologies Inc
Original Assignee
AB Dick Co
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 AB Dick Co filed Critical AB Dick Co
Application granted granted Critical
Publication of US3656818A publication Critical patent/US3656818A/en
Assigned to VIDEOJET SYSTEMS INTERNATIONAL, INC., A CORP OF DE reassignment VIDEOJET SYSTEMS INTERNATIONAL, INC., A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: A. B. DICK COMPANY A CORP OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/04—Sound-deadening or shock-absorbing devices or measures therein
    • B41J19/06—Resilient mounting of mechanism

Definitions

  • ABSTRACT A vibration resistant guide for an ink jet printing head that moves back and forth acrossa paper web, comprising a flat rail supported at opposite ends and having guideways extending along opposite edges to guide the printing head, the center of the rail having a recess in its under surface.
  • a damping bar composed of a rubber matrix with lead shot embedded therein is disposed in the recess to damp out vibrations of the rail. The damping bar fits loosely within the recess, and is retained therein by a diaphragm that covers the recess.
  • An ink jet printing machine generally employs a printing head that moves back and forth across a web of paper. While moving in the forward direction across the paper, a stream of minute ink droplets is projected at the paper and deflected so that the stream creates letters on the paper.
  • the printing head can be guided in lateral motion across the paper by an elongated guide bar or rail.
  • the printing head In order to maintain good printing fidelity, the printing head must be free from mechanical vibrations. It has been found that the guide rail is subject to resonant vibrations of large amplitudes as the printing head is thrust rapidly back and forth along it.
  • Various methods have been tried in an effort to reduce vibrations of the guide rail, including the use of viscous or elastic materials to support the rail, and the use of rails of various shapes and materials supported at various locations. None of these attempts have proven successful.
  • An object of the present invention is to provide a guide for a printing head, which effectively resists vibrations.
  • Another object is to provide an ink jet printing machine of good printing fidelity.
  • an ink jet printing machine which includes a guide along which the printing head reciprocates, wherein the guide is compact and economical to produce and effectively resists vibrations.
  • the guide is an elongated flat rail with opposite edges forming guide tracks along which the printing head moves.
  • a recess is formed at the center of the rail, and a small bar of rubber with lead shot embedded therein is positioned within the recess.
  • the recess is covered by a thin diaphragm of flexible material to retain the rubber-lead matrix therein.
  • the effect of the rubber-lead dampening bar is similar to that of a weight attached by a spring to the center of the guide rail, that counteracts vibrations to damp them.
  • FIG. 1 is a perspective view of an ink jet printer constructed in accordance with the present invention
  • FIG. 2 is a bottom view of the guide rail in the apparatus of FIG. 1;
  • FIG. 3 is a sectional view taken on and FIG. 4 is a sectional view taken on the line 4-4 of FIG. 2.
  • an ink jet printer includes a printing head that can move laterally across a guide rail 12 while a jet of ink droplets 14 is projected at a web of paper 16.
  • the printing head includes electrodes 18 for charging the ink droplets, charged deflector plates 20 for deflecting the droplets in accordance with their charge, and a catching device 22 for catching the droplet stream when no character is to be printed on the paper.
  • the printing head 10 is supported by four slider bearings or shoes 24 that move along opposite edges 26, 28 of the guide rail.
  • a servo motor 30 moves a cable 32 that is attached to the printing head to thrust the head back and forth along the guide rail.
  • the printing machine is capable of printing at high speeds, so that the printing head 10 moves at a rapid rate in a forward printing apparatus and, more parto apparatus for damping vibrations of a printing the line 33 of FIG. 2;
  • the guide rail 12 is supported by fasteners 34 that project through holes at opposite ends of the rail, and into rail supports 35. This manner of support which leaves the center portion of the rail unsupported to allow the printing head to move therealong, allows vibrations of the rail that are primarily of one frequenc which is determined by the length of the rail.
  • a cavity or recess 36 is formed in the lower face of the guide rail, and a damping bar is held therein.
  • the chamber or recess 36 is largely filled by a damping bar 38.
  • the damping bar 38 is formed from a predetemrined mass of lead shot uniformly dispersed in a soft, live rubber compound.
  • the damping bar 38 is constructed to fit loosely in the recess so that it is free to shift position slightly therein.
  • the damping bar is held in place by a diaphragm 40 that covers the recess.
  • the diaphragm 40 includes an outer sheet 42 of foil tape which completely covers the recess, and an inner sheet 44 of masking tape which is cut to a size that allows it to be received within the recess.
  • the foil tape 42 has pressure-sensitive adhesive on its upper face for sticking to the guide rail 12, while the masking tape 44 is free from adhesive on its upper surface so that it can serve to prevent sticking of the damping bar to it.
  • the damping bar 38 and diaphragm 40 operate to damp vibrations in somewhat the same manner as a weight attached by a spring to the center of a vibrating beam that is supported at opposite ends in a manner that causes the center of the beam to have the greatest amplitude of vibrations. If the spring and weight have a natural frequency of oscillation equal to that of the vibrating beam, then the weight will tend to oscillate out of phase with the beam and reduce the amplitude of vibrations.
  • the damping bar 38 largely serves as a combined spring and weight, the weight being embedded in the spring. Furthermore, the rubbery matrix material in which the lead shot weight is embedded, is a good vibration absorber.
  • the combined weight of the rubber matrix and lead shot also serves as a weight
  • the diaphragm 40 which couples the damping bar to the guide rail serves as a spring.
  • One ink jet printing machine that was constructed included a guide rail 12 of extruded aluminum, with a width of 1 inch, height of five-sixteenths inch and unsupported length of 18 inches along which the printing head moved.
  • a damping bar construction which was found highly effective in reducing vibrations, included a matrix of Dow-Corning type 732RTV silicone rubber with one-sixteenth inch diameter lead shot uniformly dispersed therein.
  • the damping bar was composed of 3 parts lead shot by weight to 1 part rubber, and the entire damping bar had a weight of approximately 15 grams.
  • the bar had a height of approximately eleven sixty-fourths inch and was held in a recess in the guide rail of approximately onefourth inch.
  • the outer sheet 42 of the diaphragm was formed from 0.0075 inch thick aluminum foil with pressure-sensitive adhesive on one side thereof.
  • the masking tape sheet 44 of the diaphragm was formed from ordinary masking tape having a thickness of about one sixty-fourth inch.
  • a guide rail having a cavity filled with loose particles of a relatively high specific gravity at least that of iron is also resistant to vibrations.
  • a resilient matrix particularly one of elastomeric material
  • additional dampening reduction is obtained while permitting easier handling of the damping material during construction.
  • good dampening is obtained while retaining compactness of the flat guide rail.
  • a guide for a printing head comprising:
  • a damping member which includes a multiplicity of items of a material at least about the density of iron embedded in elastic material, said clamping member coupled to said unsupported portion of said elongated member.
  • said elongated member comprises a substantially flat bar with guides extending along opposite edges, and with a recess formed in one face;
  • said damping member is disposed in said recess; and includa diaphragm of flexible material disposed to cover said recess to hold said matrix therein.
  • said bar is oriented with one face facing primarily downward, and said recess is formed in said downward facing face of said bar.
  • a guide for a printing head comprising:
  • an elongated member having a center portion for guiding a printing head back and forth across a printing medium, and having end portions;
  • an elongated guide member having end portions and having a center portion for guiding a printing head in back and forth motion
  • a diaphragm mounted on said elongated member and extending under said recess to support said first material, said diaphragm constructed of a thin resilient material to springingly support said material on said member so that said material can deflect downwardly with respect to said member.
  • a printing machine comprising:
  • an elongated guide bar having opposite end portions and having a recess at least in center portion thereof;
  • said recess is formed on an underside of said guide bar
  • diaphragm extending across said recess and having opposite ends mounted on said bar, said diaphragm constructed of a thin resilient material to permit downward deflection of said first material and block relative to said bar.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Ink Jet (AREA)
US35717A 1970-05-08 1970-05-08 Self-damped guide rail Expired - Lifetime US3656818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3571770A 1970-05-08 1970-05-08

Publications (1)

Publication Number Publication Date
US3656818A true US3656818A (en) 1972-04-18

Family

ID=21884384

Family Applications (1)

Application Number Title Priority Date Filing Date
US35717A Expired - Lifetime US3656818A (en) 1970-05-08 1970-05-08 Self-damped guide rail

Country Status (8)

Country Link
US (1) US3656818A (de)
BE (1) BE766895A (de)
CA (1) CA931617A (de)
DE (1) DE2122756C3 (de)
DK (1) DK129176B (de)
FR (1) FR2093445A5 (de)
GB (1) GB1350694A (de)
NL (1) NL7105763A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293053A (en) * 1979-12-18 1981-10-06 United Technologies Corporation Sound absorbing structure
FR2547227A1 (fr) * 1983-06-08 1984-12-14 Cincinnati Milacron Ind Inc Amortisseur pour glissieres de machines-outils
EP0198649A2 (de) * 1985-04-15 1986-10-22 Melles Griot, Irvine Company Gerät mit Schwingungsdämpfung
WO2003012313A2 (en) * 2001-07-27 2003-02-13 C.G. Bretting Manufacturing Company, Inc. Vibration reduction assembly for a web converting machine component
EP2679393A1 (de) * 2011-07-04 2014-01-01 Seiko I Infotech Inc. Tintenstrahldrucker
US9802431B2 (en) 2016-01-13 2017-10-31 Océ Holding B.V. Impact damping device for print-head assembly and printing apparatus incorporating same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9308318D0 (en) * 1993-04-22 1993-06-09 Montford University De Damping material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2272639A (en) * 1938-03-26 1942-02-10 Johns Manville Vibration isolating mounting
US2375818A (en) * 1943-04-15 1945-05-15 Melville F Peters Commutator brush
GB920586A (en) * 1960-09-21 1963-03-06 Bourcier Carbon Christian Improvements in or relating to pneumatic shock absorbers
US3088561A (en) * 1958-11-06 1963-05-07 Wright Barry Corp Damped structures
US3239185A (en) * 1964-02-03 1966-03-08 Cons Kinetics Corp Apparatus for isolating vibrations

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2272639A (en) * 1938-03-26 1942-02-10 Johns Manville Vibration isolating mounting
US2375818A (en) * 1943-04-15 1945-05-15 Melville F Peters Commutator brush
US3088561A (en) * 1958-11-06 1963-05-07 Wright Barry Corp Damped structures
GB920586A (en) * 1960-09-21 1963-03-06 Bourcier Carbon Christian Improvements in or relating to pneumatic shock absorbers
US3239185A (en) * 1964-02-03 1966-03-08 Cons Kinetics Corp Apparatus for isolating vibrations

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293053A (en) * 1979-12-18 1981-10-06 United Technologies Corporation Sound absorbing structure
FR2547227A1 (fr) * 1983-06-08 1984-12-14 Cincinnati Milacron Ind Inc Amortisseur pour glissieres de machines-outils
US4529255A (en) * 1983-06-08 1985-07-16 Cincinnati Milacron Inc. Machine tool way damper
EP0198649A2 (de) * 1985-04-15 1986-10-22 Melles Griot, Irvine Company Gerät mit Schwingungsdämpfung
US4706788A (en) * 1985-04-15 1987-11-17 Melles Griot, Irvine Company Vibration damped apparatus
EP0198649A3 (de) * 1985-04-15 1988-05-18 Melles Griot, Irvine Company Gerät mit Schwingungsdämpfung
WO2003012313A2 (en) * 2001-07-27 2003-02-13 C.G. Bretting Manufacturing Company, Inc. Vibration reduction assembly for a web converting machine component
WO2003012313A3 (en) * 2001-07-27 2003-06-26 Bretting C G Mfg Co Inc Vibration reduction assembly for a web converting machine component
EP2679393A1 (de) * 2011-07-04 2014-01-01 Seiko I Infotech Inc. Tintenstrahldrucker
US20140118439A1 (en) * 2011-07-04 2014-05-01 Seiko I Infotech Inc. Inkjet printer
EP2679393A4 (de) * 2011-07-04 2015-01-07 Seiko I Infotech Inc Tintenstrahldrucker
US9802431B2 (en) 2016-01-13 2017-10-31 Océ Holding B.V. Impact damping device for print-head assembly and printing apparatus incorporating same

Also Published As

Publication number Publication date
BE766895A (fr) 1971-10-01
DE2122756C3 (de) 1974-12-12
CA931617A (en) 1973-08-07
GB1350694A (en) 1974-04-18
NL7105763A (de) 1971-11-10
FR2093445A5 (de) 1972-01-28
DE2122756B2 (de) 1974-04-25
DK129176B (da) 1974-09-02
DK129176C (de) 1975-01-20
DE2122756A1 (de) 1971-11-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VIDEOJET SYSTEMS INTERNATIONAL, INC., 2200 ARTHUR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:A. B. DICK COMPANY A CORP OF DE;REEL/FRAME:004381/0140

Effective date: 19850320