EP0221837B1 - Druckwiderlager - Google Patents

Druckwiderlager Download PDF

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Publication number
EP0221837B1
EP0221837B1 EP86730110A EP86730110A EP0221837B1 EP 0221837 B1 EP0221837 B1 EP 0221837B1 EP 86730110 A EP86730110 A EP 86730110A EP 86730110 A EP86730110 A EP 86730110A EP 0221837 B1 EP0221837 B1 EP 0221837B1
Authority
EP
European Patent Office
Prior art keywords
layer
metallic
print
print bar
frequency
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
EP86730110A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0221837A2 (de
EP0221837A3 (en
Inventor
Wolfgang Dipl.-Ing. Hauslaub
Günter Dipl.-Ing. Gomoll
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT86730110T priority Critical patent/ATE83437T1/de
Publication of EP0221837A2 publication Critical patent/EP0221837A2/de
Publication of EP0221837A3 publication Critical patent/EP0221837A3/de
Application granted granted Critical
Publication of EP0221837B1 publication Critical patent/EP0221837B1/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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/02—Platens
    • B41J11/08—Bar or like line-size platens
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/10—Sound-deadening devices embodied in machines

Definitions

  • the invention relates to a pressure abutment in a printer, in particular in a matrix printer of the needle type, which consists of a layer structure in the cross section perpendicular to the longitudinal extent with a metallic fixed pressure beam, which is supported by an insulating layer air and structure-borne noise in a pressure beam support of a printer frame.
  • Such printers serve as so-called workplace printers and must not exceed the prescribed noise levels during operation.
  • the operating noises can be attributed to a hard stop when the devices are parked for a long service life and high character throughput, e.g. not just one original, but about five copies to print. This creates structure-borne noise emanating from the metallic pressure beam.
  • the vibrations propagating within the pressure bar can continue into the printer frame and the printer housing and stimulate further vibrations.
  • the printer referred to above is known from DE-PS 29 28 233.
  • the known solution provides for the pressure beam, which is mounted at both ends in rubber damping blocks to reduce the emission of structure-borne noise, to be provided with at least one damping weight.
  • the damping weight is attached by means of screws on the top and bottom of the pressure beam with a rubber damping film in between. The effect of such additional weights is low, however, because the shock waves introduced into the pressure beam propagate almost horizontally and therefore, with the known arrangement of the damping weights and damping foils, slight inhibiting effects occur.
  • a thrust abutment which has a layer structure of three layers: a relatively thin metal band made of steel, a damping layer made of a damping material and a pressure beam carrier.
  • the metal band made of steel can be vulcanized onto the damping material.
  • the pressure beam support can consist of aluminum, for example.
  • the body made of the damping material is inserted directly into a groove.
  • This noise-damped structural unit for the pressure beam of a mechanical printer consisting of the metallic support block, the inserted damping material (made of rubber) and the metal band made of steel, which is arranged on the damping material and is not directly connected to the support block, on which the compressive forces act upon mechanical pressures , however, does not meet all requirements for adequate airborne and structure-borne noise reduction.
  • the aim here is to emit very little airborne noise to the environment and very little structure-borne noise to the device.
  • such a solution cannot combat the type of structure-borne noise generation, nor can it sufficiently prevent the type of air-borne noise generation from occurring.
  • the invention is based on the object of achieving improved air and structure-borne sound absorption of the pressure beam of a printer.
  • the object is achieved according to the invention in that between the metallic pressure beam and a metallic pressure beam support, which is connected to the printer frame to form an enlarged mass via the pressure beam support, at least one vibration-reducing damping layer, a metallic intermediate layer and at least one vibration at the same time in succession in the direction of impact an insulating layer that isolates an emerging frequency are provided.
  • This design has the advantage that the shock waves are inhibited in their direction of origin. Since the force excitation occurs in a pulse-like manner due to the printing of the printing needles, it can be assumed that the force excitation represents a broadband frequency spectrum from which the printing frequency stands out.
  • the operation of the invention is based on the reflection of the waves from obstacles, which are formed from discontinuities in the transmission paths. The invention achieves that the resonance frequency achieved is far below the pressure frequency.
  • the sandwich-like structure takes advantage of the structure-borne noise damping of constrained coverings. In principle, the damping layer can consist of any material with high loss factors.
  • the vibration-reducing damping layer consists of a plastic adhesive layer which is attached between the pressure beam and a metallic intermediate layer.
  • a plastic adhesive layer transforms vibration energy particularly advantageously by flexing the plastic adhesive layer as an intermediate layer takes place, ie a simultaneous stress on bending and shear.
  • the relaxation of plastics, in which the change in position of the molecules takes place after the force is applied is used twice.
  • a relatively large proportion of structure-borne noise energy can thus be converted by means of relatively thin plastic intermediate layers.
  • a further embodiment of the invention consists in that the insulating layer decoupling the vibrations of a resulting frequency consists of a resilient plastic layer. This can be used to influence the spring constant in a replacement system to be considered.
  • a practical embodiment of the invention is now designed in such a way that the metallic pressure beam is glued to the metallic intermediate layer by means of the vibration-reducing damping layer, which in turn rests on the insulating layer that uncouples the vibrations of a frequency that occurs, the insulating layer being supported on the pressure beam underlay. In this way, optimal coordination of all parameters to be observed can be used in individual cases.
  • the metallic intermediate layer is designed as a thin strip and consists of the material brass. Tests have shown that brass has a particularly favorable effect in order to advantageously form a three-layer unit for the damping layer.
  • the pressure abutment 2 essentially consists of a pressure beam support 4, a pressure beam 5 and a pressure beam support 6.
  • the pressure beam support 6 is usually firmly connected to the pressure beam support 4 by means of screws 7.
  • the vibration excitation of the pressure beam 5 takes place through the Pressure needles in the direction of arrow 8, that is to say in the plane (drawing plane) of FIG. 2, of the cross section 9 running perpendicular to the longitudinal extent (FIG. 3).
  • the pressure abutment 2 is shown in a layer structure 10.
  • the layers extend in a constant thickness over the length of the pressure beam support 6 up to the screws 7 (FIG. 3).
  • the pressure beam support 6, the pressure beam support 4 and the printer frame 1 advantageously form the largest possible mass (M).
  • the layer structure 10 is broken down as follows:
  • a vibration-reducing damping layer 11 consists of a two-component adhesive, for example based on polyurethane. It is important for this damping layer 11 that it is soft with regard to its adhesive property, that its temperature resistance is taken into account because of the heating of the matrix printer after several hours of operation and because of the required continuous operation in large EDP systems.
  • the damping layer 11 can generally be designed as a plastic adhesive layer 11a. Furthermore, a "decoupling frequencies" insulation layer 12 is provided, which consists of plastics, such as the polymer group. In addition, a metallic intermediate layer 13 in the form of a strip 13a is provided.
  • the pressure beam 5 forms a mass (m) which is substantially increased by the damping layer 11 and by the metallic intermediate layer 13 (preferably made of brass).
  • the pressure beam 5, the damping layer 11 and the metallic intermediate layer 13 therefore represent the greatest possible mass (m) as layer group 5, 11, 13.
  • the resilient insulation layer 12 Separated from this layer group 5, 11, 13 is the resilient insulation layer 12 in the form of a plastic layer 12a. Plastics are made of plastic layer 12a here preferred from the polymer group.
  • the insulation layer 12 forms a spring in order to interrupt the transmission of the vibrations to the pressure beam carrier 4.
  • the greatest possible mass (m) - consisting of layers 5, 11, 13 - the spring action of the insulation layer 12 is kept soft in the interest of the lowest possible resonance frequency.
  • FIGS. 4 and 5 The mode of operation of an oscillation system formed by a pressure abutment is shown with the aid of FIGS. 4 and 5:
  • the force excitation of the pressure abutment 2 takes place through the mode of operation of the needle printhead 3, which works in pressure passes from left to right or from right to left, in a pulsed manner, so that it can be assumed that the force excitation represents a broadband frequency spectrum from which the pressure frequencies 14 stand out (FIG. 4).
  • the result of this is that a pressure beam itself emits airborne sound and introduces structure-borne noise into the components of the printer, stimulates other parts of the device to vibrate, which in turn emit airborne sound. Together, these phenomena result in the sound of a writing matrix printer that can be perceived as too high and therefore annoying at a workstation.
  • Curve 15 shows several structure-borne noise level curves as a function of a resonance frequency (f-res) or a pressure frequency (f-print).
  • Curve 15 was recorded on the basis of a solid pressure bar. It shows a relatively low resonance frequency, but an extremely disadvantageous pressure frequency with an increasing tendency of the structure-borne noise level.
  • curve 16 is based on the layering according to the invention steel / plastic / brass.
  • the resonance frequency is relatively low and the printing frequency considerably higher. It is very important that the pressure frequency is as far as possible above the resonance frequency.
  • the invention is also shown in simplified form on the basis of a replacement image (FIG. 6). It is assumed that the layer group consisting of the pressure beam 5, the damping layer 11 and the metallic intermediate layer 13 represents the mass (m) of a uniform pressure beam.
  • the insulation layer 12 corresponds to the damping (k) and the spring (c).
  • the printer frame 1 and the pressure beam carrier 4 together correspond to the large mass (M).
  • the resonance frequency (f-res) can be calculated, above which the pressure beam 5 effectively absorbs structure-borne noise.
  • Measurements with the accelerometer (a) have confirmed the curves according to FIG. 5.
  • the noise level of the matrix printer equipped with the invention was found to be in the range of approximately 50 dB (A).

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Impact Printers (AREA)
  • Handling Of Sheets (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP86730110A 1985-10-31 1986-07-15 Druckwiderlager Expired - Lifetime EP0221837B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86730110T ATE83437T1 (de) 1985-10-31 1986-07-15 Druckwiderlager.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853538762 DE3538762A1 (de) 1985-10-31 1985-10-31 Drucker, insbes. matrixdrucker der nadelbauart
DE3538762 1985-10-31

Publications (3)

Publication Number Publication Date
EP0221837A2 EP0221837A2 (de) 1987-05-13
EP0221837A3 EP0221837A3 (en) 1989-10-25
EP0221837B1 true EP0221837B1 (de) 1992-12-16

Family

ID=6284935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86730110A Expired - Lifetime EP0221837B1 (de) 1985-10-31 1986-07-15 Druckwiderlager

Country Status (5)

Country Link
US (1) US4984917A (ja)
EP (1) EP0221837B1 (ja)
JP (1) JPS62290548A (ja)
AT (1) ATE83437T1 (ja)
DE (2) DE3538762A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940776C1 (ja) * 1989-12-06 1991-09-12 Mannesmann Ag, 4000 Duesseldorf, De
DE3941598C2 (de) * 1989-12-13 1994-06-30 Mannesmann Ag Matrixdrucker mit einem Matrixdruckkopf, insbesondere einem Matrixnadeldruckopf, der auf einem hin- und herbewegbaren Schlitten gelagert ist
JP3001244B2 (ja) * 1990-09-21 2000-01-24 日本電気株式会社 ドットインパクトプリンタの印字方式
DE4034071C2 (de) * 1990-10-26 1993-12-09 Triumph Adler Ag Schreibmaschine, Drucker o. dgl. mit Führungsstangen für einen Schlitten
JPH0524274A (ja) * 1991-07-18 1993-02-02 Matsushita Electric Ind Co Ltd 防振防音用ノブ
US5575575A (en) * 1992-12-25 1996-11-19 Matsushita Electric Industrial Co., Ltd. Small-sized printer having multiple function motor
JP2996918B2 (ja) * 1996-06-18 2000-01-11 インターナショナル・ビジネス・マシーンズ・コーポレイション プラテン及び、印字装置
US5791795A (en) * 1996-10-07 1998-08-11 Illinois Tool Works Inc. Hot stamp impriniting system with backup pad assembly
DE19835234C2 (de) * 1998-08-04 2000-06-15 Siemens Nixdorf Inf Syst Druckbalken für ein Anschlagdruckwerk
US6561641B1 (en) 2000-02-11 2003-05-13 Lexmark International, Inc. Precision writing line control platen for high resolution ink jet printing

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1524661A (en) * 1922-10-27 1925-02-03 Underwood Typewriter Co Typewriting machine
US2224083A (en) * 1939-04-14 1940-12-03 Royal Typewriter Co Inc Typewriting machine
US3160549A (en) * 1960-12-29 1964-12-08 Minnesota Mining & Mfg Vibration damping structures
DE1182862B (de) * 1962-11-03 1964-12-03 Gruenzweig & Hartmann A G Element zur kombinierten Koerperschall- und Schwingungsisolierung
DE2437454B2 (de) * 1974-08-03 1976-12-23 Philips Patentverwaltung Gmbh, 2000 Hamburg Druckwiderlager fuer druckwerke
IT1091281B (it) * 1977-10-19 1985-07-06 Olivetti & Co Spa Organo di contrasto per una stampante ad impatto
DE2928233C2 (de) * 1979-07-12 1984-06-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen Vorrichtung zur Dämpfung des von einem Druckbalken eines Druckers ausgehenden Geräusches
DE2947111A1 (de) * 1979-11-22 1981-05-27 Siemens AG, 1000 Berlin und 8000 München Laermgedaempfte baueinheit eines geraetes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 7(M-350)(1730), 12. Januar 1985, JP-A-59158273 *

Also Published As

Publication number Publication date
US4984917A (en) 1991-01-15
DE3538762A1 (de) 1987-05-14
EP0221837A2 (de) 1987-05-13
ATE83437T1 (de) 1993-01-15
DE3687301D1 (de) 1993-01-28
DE3538762C2 (ja) 1988-04-07
JPS62290548A (ja) 1987-12-17
EP0221837A3 (en) 1989-10-25

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