EP0030271B1 - Antinoise structure - Google Patents
Antinoise structure Download PDFInfo
- Publication number
- EP0030271B1 EP0030271B1 EP80106663A EP80106663A EP0030271B1 EP 0030271 B1 EP0030271 B1 EP 0030271B1 EP 80106663 A EP80106663 A EP 80106663A EP 80106663 A EP80106663 A EP 80106663A EP 0030271 B1 EP0030271 B1 EP 0030271B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- platen
- frame
- bars
- guiding bars
- carriage
- 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
Links
- 241001247986 Calotropis procera Species 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
-
- 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 present invention relates to impact serial printers used in data processing systems, and more particularly to the mechanical structure of such printers with reference to the noise produced during the printing.
- FR - A - 2 280 511 it has been disclosed a way of reducing noise by providing a printer with a hollow cylindrical platen, the platen cavity being filled with noise deadening material such as small lead or steel balls.
- the platen shaft is further mounted to the printer frame through the interposition of rubber bushing.
- a noise reduction is therefore obtained by decoupling, as regards vibration diffusion, the mechanical elements, which constitute the main noise source, the one from the other and from the secondary element that is the frame.
- the mechanical structure of a printer includes a metallic frame formed by a bottom 5 and at least two sides 2, 3.
- front bar 6 is therefore engaged in the two grooves of side plate 3 and of side plate 2 respectively, through bushes 9, 10 and rear bar 7 is engaged in the other two grooves of side plate 3 and of side plate 2 respectively, through bushes 12 and 11. Both couples of bushes 10, 11 and 8, 9 are then clamped to side plates 2 and 3 respectively through clamping plates 13, 12.
- the parallelism between bars 6 and 7 is essential for a proper advancement of the printing head carriage; the parallelism between platen 16 and bar 7 is essential for uniform printing.
- platen 16 ends are not restrained to side plates 2 and 3 of the metallic frame (solution adopted in the prior art) but platen 16 together with bars 6 and 7, thanks to arms 14 and 15 form a unitary member connected to the metallic frame only through bushes 8, 9, 10, 11.
Landscapes
- Handling Of Sheets (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Description
- The present invention relates to impact serial printers used in data processing systems, and more particularly to the mechanical structure of such printers with reference to the noise produced during the printing.
- It is known that one of the main Inconveniences of impact printers is the considerable noise produced during the working.
- This is one of the reasons which have induced the manufacturers to invest in the research and development of non impact printers (ink-jet, electrostatic and so on) Intrinsically noiseless.
- However the need to have several printing copies existing in several activities makes still essential the use of impact printers; besides the printing speed of impact printers of matrix type satisfies, at present, the need of a large range of users.
- In the prior art the solutions adopted to reduce the noise of such printers were to equip them with covers and frames lined with deadening material and enclosing, in the best way possible, the noise source.
- So, the purpose was to reduce the effects not to remedy the causes, as the noise causes were considered impossible to be eliminated or reduced.
- In FR - A - 2 280 511 it has been disclosed a way of reducing noise by providing a printer with a hollow cylindrical platen, the platen cavity being filled with noise deadening material such as small lead or steel balls. The platen shaft is further mounted to the printer frame through the interposition of rubber bushing.
- Similarly to the above French publication the device object of the present invention allows a limitation of noise by acting on the generating causes instead of reducing the consequences. As it is known an impact serial printer generally includes a rigid frame equipped with parallel guides, arranged in the direction of the printing line, and a platen on which a printing support is held. Guides and platen are strictly fixed to the frame and are part of the same.
- In case the platen is capable of rotation.
- A printing carriage, equipped with a printing head (of needle type for mosaic printing or of bearing-type element kind) slides on the guides. It has been experimentally noted that the main noise source is given by the impact on the platen caused by the printing head, and by the head and carriage vibrations during the carriage sliding on the guides. However the produced vibrations induce vibrations all over the frame through the mechanical restraints, which frame acts therefore as sound source.
- According to the Invention a noise reduction is therefore obtained by decoupling, as regards vibration diffusion, the mechanical elements, which constitute the main noise source, the one from the other and from the secondary element that is the frame.
- Carrying out such decoupling it is necessary that the required links among elements are maintained as they are essential for the relative and invariant positioning of the elements forming the printer. Such decoupling can be obtained through elastic intermediate rubber elements and through rigid arm elements. The resilient elements are used to restrain one another, the platen and the carriage guides in a reciprocally determined position, the elastic rubber elements are used to restrain the carriage guides to the frame. These and other features of the invention will appear more clearly from the description of a preferred form of embodiment of the invention and from the attached drawings where:
- figure 1 is a perspective simplified view of the mechanical structure of a printer designed according to the invention;
- figure 2 is the perspective view of some detail of the elements which form the mechanical structure of the printer according to the invention.
- With reference to the figures the mechanical structure of a printer, according to the invention, includes a metallic frame formed by a bottom 5 and at least two
sides - Both bottom 5 and
sides sides metallic bar 6 and a rear metallic bar 7 are to be engaged. - Figure 2 shows, for better clearness, the detail of such grooves on
side 2, indicated withreference numerals side 3 is specular toside 2.Bars 6 and 7 have a bearing and guiding function for a carriage which supports the printing head. - Carriage and printing head are shown in figure 1 where they are respectively indicated by
reference numerals - The carriage is mounted on guides by means of bushes or axial bearings.
Bars 6 and 7 are preferably cylindrical and are provided with two end cylindrical tapers. - In figure 2 the tapers are indicated by
reference numerals - Four
rubber bushes bars 6 and 7. in turn the rubber bushes are inserted into the grooves of the printer side plates. - With reference to figure 1,
front bar 6 is therefore engaged in the two grooves ofside plate 3 and ofside plate 2 respectively, throughbushes side plate 3 and ofside plate 2 respectively, throughbushes bushes side plates clamping plates - In this
way bars 6 and 7 are restrained to the frame through interposition of the rubber bushes and the mutual position of the bars to assure a proper sliding of the carriage is determined within acceptable tolerances. -
Clamping plates side plates - In figure 2
clamping plate 13 and twoclamping screws 17, 18 are shown. -
Platen 16 is formed by a prismatic elongated rigid element provided with twofixing holes bars 6 and 7 by means of twoarms holes bars 6 and 7 and athird hole 30 designed to receive a screw or fixing element of the platen and corresponding to one of the twoholes platen 16 ends. - As shown in figure 1,
arms bar 6 and 7 and are interposed between the untapered end portions of the bars and the shoulder of therubber bush pairs Platen 16 is restrained to the twoarms screws - The two
arms platen 16 allowing parallelism between platen andbars 6 and 7 within acceptable tolerances also during printing. It is to be noted that the paralleism between the axis ofbars 6 and 7 within acceptable tolerances is determined by theside plates - The parallelism between
bars 6 and 7 is essential for a proper advancement of the printing head carriage; the parallelism betweenplaten 16 and bar 7 is essential for uniform printing. - It is to be noted that
platen 16 ends are not restrained toside plates platen 16 together withbars 6 and 7, thanks toarms bushes - In this way the vibrations produced on
platen 16 by the printing head needles, thanks toarms bars 6 and 7 and with further attenuation to the metallic frame owing to the damping effect of the rubber bushes. It is clear that other arrangements can be used to form two separate members, one related to bars and platen and the other related to the metallic frame of a printer, coupled together in order to form a vibration damping structure without departing from the scope of the invention.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT27050/79A IT1126317B (en) | 1979-11-06 | 1979-11-06 | ANTI-NOISE STRUCTURE OF AN IMPACT PRINTER |
IT2705079 | 1979-11-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0030271A2 EP0030271A2 (en) | 1981-06-17 |
EP0030271A3 EP0030271A3 (en) | 1981-08-12 |
EP0030271B1 true EP0030271B1 (en) | 1983-09-14 |
Family
ID=11220847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80106663A Expired EP0030271B1 (en) | 1979-11-06 | 1980-10-30 | Antinoise structure |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0030271B1 (en) |
JP (1) | JPS5684984A (en) |
DE (1) | DE3064842D1 (en) |
IT (1) | IT1126317B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58138024U (en) * | 1982-03-15 | 1983-09-17 | 株式会社堀場製作所 | recorder |
US4466753A (en) * | 1982-09-24 | 1984-08-21 | Willcox Frederick P | Carriage guiding system and frame for a printer |
FR2566705B1 (en) * | 1984-06-29 | 1986-12-19 | Dassault Electronique | CYLINDRICAL ANVIL PRINTING DEVICE, PARTICULARLY FOR TRANSPORTATION TITLES |
GB2221654B (en) * | 1988-07-12 | 1992-10-28 | Citizen Watch Co Ltd | Printing apparatus including means for absorbing vibration and for locking vibrating portion against movement |
DE3940776C1 (en) * | 1989-12-06 | 1991-09-12 | Mannesmann Ag, 4000 Duesseldorf, De | |
JP4810215B2 (en) * | 2004-12-22 | 2011-11-09 | オセ−テクノロジーズ・ベー・ヴエー | Printer having reciprocating carriage and two-stage frame structure |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2827147A (en) * | 1954-12-30 | 1958-03-18 | Underwood Corp | Typewriter and the like, with elongated platen carriage |
DE2437454B2 (en) * | 1974-08-03 | 1976-12-23 | Philips Patentverwaltung Gmbh, 2000 Hamburg | PRINTING PLATFORM FOR PRINTING UNITS |
-
1979
- 1979-11-06 IT IT27050/79A patent/IT1126317B/en active
-
1980
- 1980-10-30 EP EP80106663A patent/EP0030271B1/en not_active Expired
- 1980-10-30 DE DE8080106663T patent/DE3064842D1/en not_active Expired
- 1980-11-06 JP JP15642180A patent/JPS5684984A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
DE3064842D1 (en) | 1983-10-20 |
EP0030271A2 (en) | 1981-06-17 |
JPS6345954B2 (en) | 1988-09-13 |
EP0030271A3 (en) | 1981-08-12 |
IT1126317B (en) | 1986-05-21 |
JPS5684984A (en) | 1981-07-10 |
IT7927050A0 (en) | 1979-11-06 |
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