GB2220888A - Preventing set-off of printed matter - Google Patents
Preventing set-off of printed matter Download PDFInfo
- Publication number
- GB2220888A GB2220888A GB8911585A GB8911585A GB2220888A GB 2220888 A GB2220888 A GB 2220888A GB 8911585 A GB8911585 A GB 8911585A GB 8911585 A GB8911585 A GB 8911585A GB 2220888 A GB2220888 A GB 2220888A
- Authority
- GB
- United Kingdom
- Prior art keywords
- printed matter
- printed
- roller
- polyimide resin
- ink
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F22/00—Means preventing smudging of machine parts or printed articles
-
- 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
- B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
- B41J13/02—Rollers
- B41J13/076—Construction of rollers; Bearings therefor
Landscapes
- Handling Of Cut Paper (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
In order to prevent set-off of incompletely dry ink from freshly printed matter, the contacting surface of the handling machinery is formed of polyimide resin. In one embodiment, Fig. 1, the printed matter is a sheet 3 passing between a driving roller 2 and a pressing roller 1, with the latter having a central metal core 13, an elastic body 12 and polyimide tape wound round the body to form an anti-adherent surface for ink, Fig. 2. It is suggested that polyimide resins are stronger than other conventionally-used materials, and can be retained on the elastic body with greater ease. One particular use is downstream of a wire dot matrix printer. <IMAGE>
Description
ELEMENT FOR HOLDING PRINTED MATTER
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to an element for holding a printed matter.
As an example of prior art for holding a printed matter, a pair of rollers for transferring a printed matter is shown in Japanese Unexamined Patent
Publication No. 60-258051. This pair of rollers has a driving roller for driving a printed matter in a direction tangent to the circumference of roller and a pressing roller for pressing the printed matter on the driving roller. The pressing roller includes a rigid central roller rotatable on its own axis, a circumferential
surface-member made of Teflongresin or of vinyl resin and an elastic member disposed between the rigid central roller and the circumferential surface-member.
Since the pressing roller includes the elastic member enabling the circumferential surface-member to transform elastically, the pair of rollers can accurately hold and transfer various kinds of printed matters having respective thicknesses different from each other. But, an anti-ink-adherent characteristic of Teflon resin or of vinyl resin for preventing incompletely-dry ink from adhering to the circumferential surface-member deteriorates in accordance with a number of times of transferring. Further, when the circumferential surface-member is made of Teflon resin, it is difficult to fix the circumferential surface-member on the elastic member because of the anti-adherent characteristic of Teflon resin and the circumferential surface-member having a low strength of Teflon resin is usually broken down by large transformation of the elastic member.
OBJECT AND SUMMARY OF THE INVENTION
The main object of the present invention is to provide a printed-matter-holding element which maintains against large number of times of holding printed matters an anti-ink-adherent characteristic for preventing incompletely-dry ink applied to a printed surface from adhering to the element. Further, the present invention prevents a surface-member of printed-matter-holding element contacting with the printed surface from being broken down in accordance with a number of times of holding the printed matters. Further, the present invention enables the printed-matter-holding element to be used in a wide range of temperature, particularly at a high temperature.
In order to carry out the above objects, the printed-matter-holding element according to the present invention has a surface-member made of polyimide.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross-sectional view showing an embodiment of the present invention, in which a printedmatter-holding element according to the present invention is applied to a printed-matter-transferring device of impact printer.
Fig. 2 is a cross-sectional view showing a pressing roller used in the embodiment of Fig. 1.
Fig. 3 is a partially cross-sectional view showing another embodiment of the present invention, in which a printed-matter-holding element according to the present invention is applied to a device for moving a printed matter.
Fig. 4 is a partially cross-sectional view showing the other embodiment of the present invention, in which a printed-matter-holding element according to the present invention is applied to a device for settling a printed matter.
Fig. 5 is a schematic view showing a wire dot impact printer used for measuring the advantageous characteristics of polyimide resin.
Fig. 6 is a bar graph showing anti-ink-adherent characteristics of various materials.
Fig. 7 is a bar graph showing fed accuracies of printed matters fed by various rollers made of respective materials different to each other.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Fig. 1 shows a printed-matter-transferring device of impact printer. The printed-matter-transferring device has a pressing roller 1 and a driving roller 2.
The axes of rollers are arranged parallel to each other and the circumferential surfaces of rollers are arranged in close vicinity to each other. The pressing roller l is rotatable on its own axis. The driving roller 2 is driven by a stepping motor or by a servomotor. One of the pressing roller 1 and driving roller 2 is pressed on the other roller. A printed matter or piled papers are inserted between the pressing roller 1 and driving roller 2. A printed surface 3' of the printed matter 3 inserted between the rollers contacts with the pressing roller 1 and another surface contacts with the driving roller 2. The printed matter 3 is driven by the driving roller 2 and the pressing roller 1 is rotated through the printed matter 3 by the driving roller 2.
The pressing roller 1 has a circumferential surface member 11 made of polyimide resin. The circumferential surface member 11 is formed by a thin tape of polyimide resin wound and adhered onto a circumferential surface of elastic roller 12. The thin tape of polyimide resin has a width of 7 mm and a thickness of 25 microns. The elastic roller 12 has a diameter of 15 mm. As an adhesive for adhering the thin tape 11 to the elastic roller 12, silicon adhesives are preferable. The ends of thin tape of polyimide resin are adhered to each other with an overlap length of 5 mm. The elastic roller 12 is made of form rubber having low elastic modulus. The thickness of elastic roller 12 is 3 mm and inside of that a central metal roller 13 is arranged.
In the present invention, it was found that the anti-ink-adherent characteristic of polyimide resin is superior to that of Teflon resin and so forth. In addition, it is well known that the elastic limit of polyimide resin is higher than that of Teflon resin in a wide range of temperature. Further, it is also well known that the characteristics of polyimide resin do not change at ordinary temperature during a long period of time.
Since the anti-ink-adherent characteristic of polyimide resin is superior to that of Teflon resin and so forth, the element according to the present invention can hold printed surfaces with less stain of printed surface in comparison with the prior art. In addition, since the polyimide resin can be used in a range from -250 degrees C. to 400 degrees C., the element according to the present invention can used when the printed matter is heated to dry ink or when the room temperature changes between high temperature and low temperature.
In addition, since polyimide resin is adhered easily by adhesives in comparison with Teflon resin, the element according to the present invention can used without separation between the surface member and the body of element. In addition, since the elastic limit of polyimide resin is high, the thickness of surface member of polyimide resin can be very small, so that the surface member can transform largely in accordance with the shape and/or elasticity of element body supporting the surface member.
When the element according to the present invention is used as the circumferential surface member 11 of the pressing roller 1 as shown in Fig. 1, the pressing roller 1 can be transformed by the printed matter 3 having a step portion 3'. An impact force generated at a time of contact between the pressing roller 1 and the printed matter 3 is absorbed by the transformations of the elastic roller 12 and the circumferential surface member 11. Since the pressing roller 1 transforms softly in accordance with the shape of the printed matter 3, the fed length of the printed matter 3 is accurately in proportion to the rotational degrees of the driving roller 2.
Since the ends 14 of the thin tape 11 of polyimide resin are adhered to each other through the overlap length, there is the possibility of separation of the adhered overlap length. But, the pressing force of the pressing roller 1 prevents the separation.
In an embodiment shown in Fig. 3, the element according to the present invention is used as a surface member not of the pressing roller but of the driving roller 21. The.pressing roller is not used in this embodiment. When the frictional force between a printed matter 22 and the driving roller 21 is large enough to transfer the printed matter 22, it is not necessary to use a pressing roller as this embodiment.
In an embodiment shown in Fig. 4, the element according to the present invention is used as a surface member of a printed matter holding element 31. A printed matter 22 supported on a supporting base 33 is held by the printed matter holding element 31 through a polyimide resin film 32 which contacts with a printed surface having incompletely-dry ink. The anti-inkadherent characteristic of polyimide resin prevents the incompletely-dry ink applied to the printed surface from adhering to the printed matter holding element 31.
Fig. 5 shows schematically a wire dot impact printer used for measuring anti-ink-adherent characteristics of various materials and for measuring fed accuracy of sheaf constituted by piled papers. The wire dot impact printer has a printing head 44, an upstream pressing roller 41, a downstream pressing roller 42 and driving rollers 43. The anti-ink-adherent characteristics are determined from ink-stain-densities on the printed surfaces. The ink-stain is made of incompletely-dry ink used for printing. The ink-staindensities are measured with PCS (Print Contrast Signal) measuring device after the printed matter 22 has passed through a downstream pressing roller 42. The point to be measured on the printed surface has a maximum inkstain-density on the printed surface.Fig. 6 shows ink-stain-densities on the printed surfaces fed by various rollers made of respective materials different to each other. PCS is defined by a following formula when Rw is a maximum index of reflection of unprinted surface and Rp is an index of reflection of the measured point, and Rw and Rp are measured with PCS (Print Contrast Signal) measuring device.
PCS = (Rw - Rp)/Rw
In Fig. 6, it is understood that the anti-inkadherent characteristic of polyimide resin is superior in comparison with the other used materials.
The fed accuracy of sheaf constituted by piled papers is determined by measuring a difference in fed length between a first paper contacting with the pressing roller 41 and a fifth paper contacting with the driving roller 43. In Fig. 7, it is understood that the fed accuracy of sheaf fed by the element according to the present invention is superior in comparison with the prior art.
Claims (6)
1. An element for holding a printed matter, said element having a surface member for contacting with a printed surface having incompletely-dry ink, wherein said surface member is made of polyimide resin.
2. A device having at least one roller for transferring a printed matter, said roller having a surface member for contacting with a printed surface having incompletely-dry ink, wherein said surface member is made of polyimide resin.
3. A device having at least one pair of rollers for transferring a printed matter, said printed matter inserted between said pair of rollers, said printed matter transferred in accordance with rotations of said pair of rollers, at least one roller of said pair of rollers having a surface member for contacting with a printed surface having incompletely-dry ink, wherein said surface member is made of polyimide resin.
4. A device according to Claim 3, wherein said at least one roller having an elastic roller on which said surface member is attached.
5. An element for holding printed matter constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
6. A device for transferring printed matter constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63125989A JPH01295869A (en) | 1988-05-25 | 1988-05-25 | Feed roller |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8911585D0 GB8911585D0 (en) | 1989-07-05 |
| GB2220888A true GB2220888A (en) | 1990-01-24 |
| GB2220888B GB2220888B (en) | 1992-07-08 |
Family
ID=14923975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8911585A Expired - Lifetime GB2220888B (en) | 1988-05-25 | 1989-05-19 | Element for holding printed material |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH01295869A (en) |
| KR (1) | KR940010364B1 (en) |
| GB (1) | GB2220888B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711578A1 (en) * | 1993-10-29 | 1995-05-05 | Seiko Epson Corp | Low noise printer. |
| WO1997009262A1 (en) * | 1995-09-08 | 1997-03-13 | Indigo N.V. | Imaging apparatus and improved exit device therefor |
| DE10037952A1 (en) * | 2000-08-03 | 2002-02-21 | Agfa Gevaert Ag | Device for borderless printing of image material by means of an ink jet printer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101153568B1 (en) | 2009-11-02 | 2012-06-11 | 삼성전기주식회사 | Multi-stage cmos power amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4150181A (en) * | 1977-07-01 | 1979-04-17 | Xerox Corporation | Fixing method using polysiloxane-fluorocarbon blends as release agents |
-
1988
- 1988-05-25 JP JP63125989A patent/JPH01295869A/en active Pending
-
1989
- 1989-05-19 GB GB8911585A patent/GB2220888B/en not_active Expired - Lifetime
- 1989-05-24 KR KR1019890006954A patent/KR940010364B1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4150181A (en) * | 1977-07-01 | 1979-04-17 | Xerox Corporation | Fixing method using polysiloxane-fluorocarbon blends as release agents |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711578A1 (en) * | 1993-10-29 | 1995-05-05 | Seiko Epson Corp | Low noise printer. |
| US5913626A (en) * | 1993-10-29 | 1999-06-22 | Seiko Epson Corporation | Printer having noise noise reduction structure |
| US6336758B1 (en) | 1993-10-29 | 2002-01-08 | Seiko Epson Corporation | Printer |
| DE4435452B4 (en) * | 1993-10-29 | 2009-09-24 | Seiko Epson Corp. | printer |
| WO1997009262A1 (en) * | 1995-09-08 | 1997-03-13 | Indigo N.V. | Imaging apparatus and improved exit device therefor |
| US6163676A (en) * | 1995-09-08 | 2000-12-19 | Indigo N.V. | Imaging apparatus and improved exit device therefor |
| DE10037952A1 (en) * | 2000-08-03 | 2002-02-21 | Agfa Gevaert Ag | Device for borderless printing of image material by means of an ink jet printer |
| US6733109B1 (en) | 2000-08-03 | 2004-05-11 | Agfa-Gevaert Aktiengesellschaft | Device for borderless printing of images using an ink jet printer |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2220888B (en) | 1992-07-08 |
| KR900017887A (en) | 1990-12-20 |
| GB8911585D0 (en) | 1989-07-05 |
| JPH01295869A (en) | 1989-11-29 |
| KR940010364B1 (en) | 1994-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040519 |