WO2000044655A1 - Sheet feeder for office machines and process for its manufacture - Google Patents
Sheet feeder for office machines and process for its manufacture Download PDFInfo
- Publication number
- WO2000044655A1 WO2000044655A1 PCT/EP1999/006497 EP9906497W WO0044655A1 WO 2000044655 A1 WO2000044655 A1 WO 2000044655A1 EP 9906497 W EP9906497 W EP 9906497W WO 0044655 A1 WO0044655 A1 WO 0044655A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- feed
- synthetic resin
- water
- coating layer
- Prior art date
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
- B65H3/00—Separating articles from piles
- B65H3/02—Separating articles from piles using friction forces between articles and separator
- B65H3/06—Rollers or like rotary separators
- B65H3/0638—Construction of the rollers or like rotary separators
Definitions
- - Fig. 1 shows a sheet feeder for printers according to a first exemplary embodiment of the invention, in which the feed shaft is interrupted for the sake of clarity;
- - Fig. 2 is a sectional view, on an enlarged scale, on the plane II-II in Fig. 1;
- each feed roller 12 has an outer peripheral annular friction band 12.1 consisting of a surface coating made up of at least one layer consisting of at least one synthetic resin or at least one water-based varnish, containing at least one evenly distributed surface roughening means in powder or granule form.
- Synthetic resins which can be used to form the said annular friction band 12.1 are, for example, polyester resins, epoxy resins, polyurethane resins and the like.
- the said base layer incorporating the said surface roughening means is then allowed to dry over a suitable period of time, for example at room temperature;
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
According to the invention, in a sheet feeder for office machines, the feed shaft (11) and/or the integral feed members (12) have at least one outer peripheral annular friction band (12.1) consisting of a surface coating comprising at least one layer consisting of at least one synthetic resin or at least one water-based varnish, containing at least one evenly distributed surface roughening means in powder or granule form. The following stages are carried out in order to form the said band: a coating layer is deposited on part of the surface of the shaft and/or of each feed member, applying at least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means; at least one additive in powder or granule form and constituting the surface roughening means is then applied in a uniform layer onto the said coating layer while it is still wet and acts like an adhesive; it is then allowed to dry.
Description
"SHEET FEEDER FOR OFFICE MACHINES AND PROCESS FOR ITS MANUFACTURE"
The present invention relates to a sheet feeder for office machines. The invention also relates to a process for manufacturing such a feeder.
Known sheet feeders of the type specified generally comprise a rotary feed shaft which can be fitted with integral friction members which, as they rotate in contact with the surface of a sheet, cause the latter to advance in the desired direction. Such friction members consist, for example, of feed rollers fixed coaxially to the feed shaft.
Moreover, in photocopiers, fax machines and in all types of printers (impact, laser and ink-jet printers) and similar known office machines, sheets of paper are fed by means of a feed shaft, as mentioned above, working against rollers or pads made of a "soft" material. Such an arrangement enables a number of sheets stacked on top of each other in a magazine to be picked up individually and advanced sequentially, being passed forward one at a time in the desired direction. However, in order for this process to take place, the coefficient of friction (Ka) of the various elements must satisfy the following relationship:
Ka Rl > Ka R2 < Ka F, in which:
Ka Rl = coefficient of friction between the feed member (e.g. feed roller) and the sheet to be fed; Ka R2 = coefficient of friction between the member working against the feed member and the sheet to be fed; Ka F = coefficient of friction between stacked sheets.
This relationship must, furthermore, remain constant, possibly for the entire service life of the feed member, which is equivalent to about one hundred thousand sheets.
The choice of material used to make the feed roller and/or shaft is clearly crucial to the system's correct and efficient operation.
The following are currently used as feed members :
- metal rollers, in which the friction surface is roughened by means of successive treatments. (Certain known feeders in particular employ brass feed rollers in which the peripheral friction surface is roughened by means of a tungsten carbide plasma deposition treatment. The main drawback of these brass feed rollers is that their manufacture requires exacting and expensive technical processes);
- rubber rollers or the like, in which the rubber contains suitable additives and has been suitably treated to give a surface roughness suited to the feed action.
The use of these materials results in a number of disadvantages for which there are no simple solutions.
In the first case, in addition to the rather high production costs involved, the sheets can be damaged as a result of abrasion when paper jams occur.
In the second case, the powder produced by abrasion of the sheets during their advance is deposited on the rollers and thus reduces the value of
Ka Rl.
The main object of the present invention is, therefore, to provide a sheet feeder for office machines which does not abrade the paper and which, after a normal initial loss, stabilizes at a coefficient of friction which remains virtually constant over time and for the feeder's entire service life. A further object is to provide a sheet feeder as specified which has a simplified structure and does not require such exacting and expensive technical processes for its manufacture.
A further object is to provide a sheet feeder as specified which satisfies the requirements of current legislation on the protection of the environment and health and safety regulations. It is also an object of the invention to provide a process for manufacturing a sheet feeder for office machines which is simple and economical to implement .
In the light of these objects, the present invention provides a sheet feeder for office machines, the essential characteristic of which forms the subject of the main claim.
A further advantageous characteristic is detailed in the dependent claim. The process according to the present invention forms the subject of Claims 3 to 7.
These claims are understood to form an integral part of this description.
The present invention is described in detail below with reference to the appended drawings which are given by way of non-limiting example and in which:
- Fig. 1 shows a sheet feeder for printers according to a first exemplary embodiment of the invention, in which the feed shaft is interrupted for the sake of clarity; - Fig. 2 is a sectional view, on an enlarged scale, on the plane II-II in Fig. 1;
- Fig. 3 is a view in partial section on the plane III- III in Fig. 2;
- Fig. 4 is a view similar to that in Fig. 1, but shows another exemplary embodiment of the present invention;
- Fig. 5 is a sectional view, on an enlarged scale, on the plane V-V in Fig. 4;
- Fig, 6 is a view in partial section on the plane VI- VI in Fig. 5. Referring first of all to Figures 1 to 3, the general reference 10 (Fig. 1) denotes the sheet feeder for printers according to the said first exemplary embodiment .
The said feeder 10 comprises a feed shaft 11, made for example of steel, on which a plurality of plastic feed rollers 12 are fixed coaxially and spaced axially apart from one another. The said feed rollers 12 rotate integrally with the shaft 11 by virtue of coupling means in the form of splines.
According to the invention, each feed roller 12 has an outer peripheral annular friction band 12.1 consisting of a surface coating made up of at least one layer consisting of at least one synthetic resin or at least one water-based varnish, containing at least one evenly distributed surface roughening means in powder or granule form. Synthetic resins which can be used to form the said annular friction band 12.1 are, for example, polyester resins, epoxy resins, polyurethane resins and the like.
Additives for roughening the surface of the said annular friction band 12.1 are, for example, fumed silica, aluminium oxide, quartz powders and the like.
Forming the said annular friction band 12.1 on each feed roller 12 involves the following stages of surface treatment: - firstly, a coating layer is deposited on the outer lateral surface of the roller, applying at least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means (e.g. spraying means, deposition rollers and the like); - at least one additive in powder or granule form and constituting the surface roughening means is then applied in a uniform layer onto the said coating layer while it is still wet and acts like an adhesive, for example according to methods involving the deposition of sand on a wet base, using conventional application means (e.g. spraying means, deposition rollers and the like) ;
- the said coating layer incorporating the said surface roughening means is then allowed to dry over a suitable period of time, for example at room temperature.
According to an alternative method for forming the said annular friction band 12.1 on each feed roller 12, the following operational stages are carried out:
- the coating material to be applied is first of all prepared by mixing together, in suitable proportions, at least one synthetic resin in the liquid state or a solution of at least one water-based varnish with at least one additive in powder or granule form constituting the surface roughening means, a coating layer of the said material is then deposited on the outer lateral surface of the roller using conventional application means (e.g. spraying means, deposition rollers and the like), and
- the said coating layer is then allowed to dry over a suitable period of time, for example at room temperature. In a variant embodiment, each feed roller 12 has an outer peripheral annular friction band 12.1 consisting of a surface coating made up of several layers, i.e. :
- a base layer including at least one synthetic resin or at least one water-based varnish, containing at least one evenly distributed surface roughening means in powder or granule form, and
- a surface coating layer, applied onto the said base layer incorporating the said roughening means and it too including at least one synthetic resin or at least one water-based varnish.
It should be noted that the use of at least one water-based varnish is particularly advantageous from the environmental and health and safety viewpoints. Forming the said annular friction band 12.1 made up of several layers on each feed roller 12 involves the following stages of surface treatment:
- firstly, a base layer is deposited on the outer lateral surface of each feed roller 12, applying at
least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means (e.g. spraying means, deposition rollers and the like) ; - at least one additive in powder or granule form and constituting the surface roughening means is then applied in a uniform layer onto the said base layer while it is still wet and acts like an adhesive, for example according to the method involving the deposition of sand on a wet base, using conventional application means (e.g. spraying means, deposition rollers and the like) ;
- the said base layer incorporating the said surface roughening means is then allowed to dry over a suitable period of time, for example at room temperature;
- a surface coating layer is next deposited onto this base layer incorporating the said surface roughening means, applying at least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means (e.g. spraying means, deposition rollers and the like) . It is allowed to dry, for example at room temperature.
During the process described above, the feed shaft 11 bearing the feed rollers 12 is advantageously kept in rotation about its axis, for example by means of a conventional electric motor, while the said application means operate from a stationary position.
The process detailed above expediently comprises a preliminary stage for preparing the surface of each feed roller in order to provide it with a sufficient roughness to enable the resin or varnish to be applied, for example by means of a sand deposition operation, to adhere.
Referring now to Figures 4 to 6, the general reference 20 denotes the sheet feeder for printers according to the said alternative exemplary embodiment of the present invention.
The said feeder 20 comprises a feed shaft 21, made for example of steel, bearing a plurality of integral and coaxial feed rollers 22.
The feed rollers 22 are made in the form of rings 22.1 which are rigidly connected to the shaft 21 by means of an integral part forming an internal flange 22.2 which is also integral with the shaft.
Each of the said feed rollers 22 has a friction portion which is formed by an outer peripheral annular friction band 22.3 which consists of a surface coating made up of several layers. The said friction band 22.3 comprises - as in the example according to Figures 1 to 3:
- a base layer (applied onto the outer lateral surface of each feed roller 22 and consisting of a coating including at least one synthetic resin or at least one water-based varnish) , the said base layer containing at least one evenly distributed surface roughening means in powder or granule form, as specified above, and - a surface coating layer, applied onto the said base layer incorporating the said roughening means and it too including at least one synthetic resin or a water- based varnish.
For further details please refer to the description given above with respect to the sheet feeder 10.
The main advantages of the sheet feeder for an office machine according to the invention are:
- greater stability; - greater dimensional precision;
- virtually no wear;
- high feed force; and
- coefficient of friction which is constant over time.
Additional advantages of the sheet feeder and the associated manufacturing process according to the invention are: simplified feeder structure, reduced costs, extended feeder service life and greater compliance with current legislation on the protection of the environment and health and safety regulations.
Of course, numerous modifications can, in practice, be made to the embodiments specified above which have been described and illustrated solely by way of example. Thus, for example, the outer cylindrical surface of the said feed shaft can be at least partly coated with one or more annular bands of a friction material made up of one or more layers, the latter including a base layer made up of at least one synthetic resin or at least one water-based varnish, at least one surface roughening means in powder or granule form which is distributed and incorporated evenly within the said base layer, and a surface coating layer made up of at least one synthetic resin or at least one water-based varnish. The sheet feed is in this case performed directly by the said shaft, without the need for feed members such as integral rollers.
Claims
1. Sheet feeder for office machines, including a feed shaft which, directly or via integral feed members, causes each of a plurality of sheets stacked on top of one another in a magazine of sheets to advance in the desired direction, characterized in that the said feed shaft (11, 21) and/or the said integral feed members (12, 22) have at least one outer peripheral annular friction band (12.1, 22.3) consisting of a surface coating comprising at least one layer consisting of at least one synthetic resin or at least one water-based varnish, containing at least one evenly distributed surface roughening means in powder of granule form.
2. Sheet feeder according to Claim 1, characterized in that the said surface coating comprises a plurality of layers, i.e. at least: - a base layer including at least one synthetic resin or at least one water-based varnish, containing at least one evenly distributed surface roughening means in powder or granule form, and
- a surface coating layer, applied onto the said base layer incorporating the said roughening means and it too including at least one synthetic resin or at least one water-based varnish.
3. Process for manufacturing the sheet feeder according to Claim 1, characterized in that forming the said annular friction band (12.1, 22.3) on the said shaft and/or on the said feed members (11, 12; 21, 22) involves the following stages of surface treatment:
- firstly, a coating layer is deposited on at least part of the outer lateral surface of the shaft and/or of each feed member, applying at least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means (e.g. spraying means, deposition rollers and the like);
- at least one additive in powder or granule form and constituting the surface roughening means is then applied in a uniform layer onto the said coating layer while it is still wet and acts like an adhesive, for example according to methods involving the deposition of sand on a wet base, using conventional application means (e.g. spraying means, deposition rollers and the like);
- the said coating layer incorporating the said surface roughening means is then allowed to dry over a suitable period of time, for example at room temperature.
4. Process for manufacturing the sheet feeder according to Claim 1, characterized in that forming the said annular friction band (12.1, 22.3) on the said shaft and/or on the said feed members (11, 12; 21, 22) involves the following operational stages: - the coating material to be applied is first of all prepared by mixing together, in suitable proportions, at least one synthetic resin in the liquid state or a solution of at least one water-based varnish with at least one additive in powder or granule form constituting the surface roughening means, a coating layer of the said material is then deposited on at least part of the outer lateral surface of the shaft and/or of each feed member, using conventional application means (e.g. spraying means, deposition rollers and the like) , and
- the said coating layer is then allowed to dry over a suitable period of time, for example at room temperature .
5. Process for manufacturing the sheet feeder according to Claim 2, characterized in that forming the said annular friction band (12.1, 22.3) on the said shaft and/or on the said feed members (11, 12; 21, 22) involves the following stages of surface treatment: - firstly, a base layer is deposited on at least part of the outer lateral surface of the shaft and/or of each feed member, applying at least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means (e.g. spraying means, deposition rollers and the like) ;
- at least one additive in powder or granule form and constituting the surface roughening means is then applied in a uniform layer onto the said base layer while it is still wet and acts like an adhesive, for example according to the method involving the deposition of sand on a wet base, using conventional application means (e.g. spraying means, deposition rollers and the like) ;
- the said base layer incorporating the said surface roughening means is then allowed to dry over a suitable period of time, for example at room temperature;
- a surface coating layer is next deposited onto the said base layer incorporating the said surface roughening means, applying at least one synthetic resin in the liquid state or a solution of at least one water-based varnish, using conventional application means (e.g. spraying means, deposition rollers and the like) , then allowing it to dry over a suitable period of time, for example at room temperature.
6. Process according to Claim 3, 4 or 5, characterized in that the said feed shaft (11, 21) is kept in rotation about its axis, for example by means of a conventional electric motor, while the said application means operate from a stationary position.
7. Process according to Claim 3, 4 or 5, characterized in that it comprises a preliminary stage for preparing the surface of the said shaft and/or of the said feed members (11, 12; 21, 22) in order to provide it with a roughness at least sufficient to enable the resin or varnish to be applied, for example by means of a sand deposition operation, to adhere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU58602/99A AU5860299A (en) | 1999-01-27 | 1999-09-03 | Sheet feeder for office machines and process for its manufacture |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITTO990057 IT1307014B1 (en) | 1999-01-27 | 1999-01-27 | SHEET FEEDER FOR OFFICE MACHINES AND PROCESS FOR LASUA MANUFACTURE. |
| ITTO99A000057 | 1999-01-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000044655A1 true WO2000044655A1 (en) | 2000-08-03 |
Family
ID=11417391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1999/006497 WO2000044655A1 (en) | 1999-01-27 | 1999-09-03 | Sheet feeder for office machines and process for its manufacture |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5860299A (en) |
| IT (1) | IT1307014B1 (en) |
| WO (1) | WO2000044655A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2343603A3 (en) * | 2009-12-24 | 2014-09-17 | Samsung Electronics Co., Ltd. | Pickup roller and image forming apparatus having the same |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3802735A1 (en) * | 1988-01-28 | 1989-08-10 | Siemens Ag | Paper transporting roller and its use in a printing device |
| US4883703A (en) * | 1988-08-29 | 1989-11-28 | Riccio Louis M | Method of adhering thermal spray to substrate and product formed thereby |
| JPH0395046A (en) * | 1989-09-06 | 1991-04-19 | Riken Korandamu Kk | Friction member and manufacture thereof |
| EP0452880A1 (en) * | 1990-04-17 | 1991-10-23 | Canon Kabushiki Kaisha | Delivery member and apparatus making use of it |
| US5180612A (en) * | 1990-05-31 | 1993-01-19 | Komori Currency Technology Uk Ltd. | Apparatus and method for progressively coating a cylinder |
| EP0545707A1 (en) * | 1991-12-04 | 1993-06-09 | Canon Kabushiki Kaisha | Delivery member, and apparatus employing the same |
| DE4238508A1 (en) * | 1992-11-14 | 1994-05-19 | Gf Flamm Metallspritz Gmbh | Roller with roughened surface - has adhesive layer for fine grain hard materials to be embedded before the adhesive hardens to give longer working life |
| DE4238507A1 (en) * | 1992-11-14 | 1994-05-19 | Gf Flamm Metallspritz Gmbh | Surfaced rollers for paper - has ultra hard particles embedded in layer of resin glue |
| DE19701542A1 (en) * | 1996-01-19 | 1997-07-24 | Alps Electric Co Ltd | Sheet feeder roll for e.g. printer |
| JPH10265079A (en) * | 1997-03-21 | 1998-10-06 | Bridgestone Corp | Paper supply member and paper supply device |
| JPH10291677A (en) * | 1997-04-18 | 1998-11-04 | Harada Kogyo:Kk | Paper feeder roller and its manufacture |
-
1999
- 1999-01-27 IT ITTO990057 patent/IT1307014B1/en active
- 1999-09-03 AU AU58602/99A patent/AU5860299A/en not_active Abandoned
- 1999-09-03 WO PCT/EP1999/006497 patent/WO2000044655A1/en active Application Filing
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3802735A1 (en) * | 1988-01-28 | 1989-08-10 | Siemens Ag | Paper transporting roller and its use in a printing device |
| US4883703A (en) * | 1988-08-29 | 1989-11-28 | Riccio Louis M | Method of adhering thermal spray to substrate and product formed thereby |
| JPH0395046A (en) * | 1989-09-06 | 1991-04-19 | Riken Korandamu Kk | Friction member and manufacture thereof |
| EP0452880A1 (en) * | 1990-04-17 | 1991-10-23 | Canon Kabushiki Kaisha | Delivery member and apparatus making use of it |
| US5180612A (en) * | 1990-05-31 | 1993-01-19 | Komori Currency Technology Uk Ltd. | Apparatus and method for progressively coating a cylinder |
| EP0545707A1 (en) * | 1991-12-04 | 1993-06-09 | Canon Kabushiki Kaisha | Delivery member, and apparatus employing the same |
| DE4238508A1 (en) * | 1992-11-14 | 1994-05-19 | Gf Flamm Metallspritz Gmbh | Roller with roughened surface - has adhesive layer for fine grain hard materials to be embedded before the adhesive hardens to give longer working life |
| DE4238507A1 (en) * | 1992-11-14 | 1994-05-19 | Gf Flamm Metallspritz Gmbh | Surfaced rollers for paper - has ultra hard particles embedded in layer of resin glue |
| DE19701542A1 (en) * | 1996-01-19 | 1997-07-24 | Alps Electric Co Ltd | Sheet feeder roll for e.g. printer |
| JPH10265079A (en) * | 1997-03-21 | 1998-10-06 | Bridgestone Corp | Paper supply member and paper supply device |
| JPH10291677A (en) * | 1997-04-18 | 1998-11-04 | Harada Kogyo:Kk | Paper feeder roller and its manufacture |
Non-Patent Citations (3)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 015, no. 276 (M - 1135) 12 July 1991 (1991-07-12) * |
| PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01 29 January 1999 (1999-01-29) * |
| PATENT ABSTRACTS OF JAPAN vol. 1999, no. 02 26 February 1999 (1999-02-26) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2343603A3 (en) * | 2009-12-24 | 2014-09-17 | Samsung Electronics Co., Ltd. | Pickup roller and image forming apparatus having the same |
| US8858412B2 (en) | 2009-12-24 | 2014-10-14 | Samsung Electronics Co., Ltd. | Pickup roller and image forming apparatus having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| ITTO990057A1 (en) | 2000-07-27 |
| IT1307014B1 (en) | 2001-10-11 |
| AU5860299A (en) | 2000-08-18 |
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