EP0528049A1 - Paper clamp for printer - Google Patents
Paper clamp for printer Download PDFInfo
- Publication number
- EP0528049A1 EP0528049A1 EP92905969A EP92905969A EP0528049A1 EP 0528049 A1 EP0528049 A1 EP 0528049A1 EP 92905969 A EP92905969 A EP 92905969A EP 92905969 A EP92905969 A EP 92905969A EP 0528049 A1 EP0528049 A1 EP 0528049A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- clamp member
- clamping device
- hard
- friction material
- 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.)
- Withdrawn
Links
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
- 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
- B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
- B41J13/22—Clamps or grippers
Definitions
- the present invention relates to a sheet clamping device for holding a sheet at one end when the sheet is being printed in a printer.
- Fig. 3 is a side view of a sheet clamping device constructed in accordance with the prior art and disclosed in Japanese Patent Laid-Open No. Hei 2-132471.
- the clamping device 1 conveys a sheet 2 by moving in a direction shown by arrow 14 in Fig. 3 while holding the sheet 2 at one end.
- the sheet clamping device 1 comprises upper and lower clamp members 4, 5 which are adapted to grasp the sheet 2.
- the upper clamp member 4 is pivotally supported at one end on a support shaft 3, with the other end of the upper clamp member being adapted to engage the sheet 2.
- the engaging end of the upper clamp member 4 is biased against the lower clamp member 5 under the influence of a spring 7.
- the engaging end of the lower clamp member 5 includes a friction plate 6 of resilient material secured thereto. The sheet 2 will be held between the friction plate 6 on the lower clamp member 5 and the upper clamp member 4 biased against the lower clamp member 5 under the biasing force of the spring 7.
- the right-hand portion of the Fig. 3 schematically shows a printing mechanism including a thermal head 8.
- the sheet 2 On printing, the sheet 2 is grasped, together with an ink sheet 11, between a platen roller 9 and the thermal head 8.
- the sheet clamping device 1 When the sheet clamping device 1 is moved in the direction of arrow 14, the sheet is also fed in the same direction.
- the respective heat emitting elements in the thermal head 8 are energized by image signals. The heat fuses the ink on the ink sheet 11 and the fused ink is transferred to the sheet 2 for printing.
- the ink sheet 11 is also moved from an ink sheet supply roller 13 to an ink sheet take-up roller 12.
- a pinch roller 10 is provided to stabilize the sheet 2 on the platen roller 9.
- the coefficient of friction at the friction plate 6 is insufficient to clamp the sheet 2. If any dirt or dust is deposited on the friction plate 6, the clamping force is further reduced, resulting in slippage of the sheet 2 into misalignment. This will raise various problems such as printing shear, jamming and others.
- a color shift may be produced due to the printing shear since a plurality of printing operations are carried out onto the same sheet.
- an object of the present invention is to provide a sheet clamping device in a printer, which will not reduce the clamping force even if any dirt or dust is deposited therein and which can provide an improved reproducibility with respect to the sheet position.
- the present invention provides a sheet clamping device in a printer, comprising a lower clamp member, a support shaft disposed thereon at one end, and an upper clamp member pivotally supported on the support shaft.
- One of the upper and lower clamp members includes a sheet contacting surface of hard, high-friction material while the sheet contacting surface of the other clamp member includes a resilient urging member applied thereto.
- the hard, high-friction material may be a bonded body of ceramic particles or sand paper.
- a printing sheet can be reliably clamped and grasped between one sheet contacting surface of hard, high-friction material and another sheet contacting surface of resilient urging member. Even if any dust becomes deposited on the hard, high-friction layer, they can be absorbed by the resilient urging member without reduction of the clamping force. Therefore, the position of sheet can be repro Jerusalem with an increased accuracy.
- Fig. 1 is a side view of one embodiment of a sheet clamping device constructed in accordance with the present invention.
- Fig. 2 is a view showing another embodiment of the present invention.
- Fig. 3 is a side view of a sheet clamping device constructed in accordance with the prior art.
- reference numeral 15 denotes an upper clamp member; 16 a hard, high-friction material; 17 a lower clamp member; and 18 a resilient urging member.
- a sheet clamping device constructed in accordance with the present invention which comprises parts 2, 3 and 7-13 similar to those of the prior art device shown in Fig. 3 and which will not be further described herein.
- the sheet clamping device comprises upper and lower clamp members 15, 17.
- the upper clamp member 15 is pivotally supported on a support shaft 3 for rotational movement relative to the lower clamp member 17.
- the other end of each of the upper and lower clamp members 15, 17 includes a pressure sheet contacting surface formed therein.
- One of the pressure sheet contacting surfaces (the upper clamp surface) is formed of a hard, high-friction material 16 in the form of a bonded body of ceramic particles while the other pressure sheet contacting surface (the lower clamp surface) is formed of a resilient urging member 18 applied thereto, such as a rubber plate, a synthetic resin elastomer plate or the like.
- the upper clamp member 15 is pivoted about the support shaft 3 to provide an opening between the upper and lower clamp members 15, 17.
- the sheet 2 is then inserted into the opening. Thereafter, the opening is closed to hold the sheet 2 between the hard, high-friction material 16 of the upper clamp member 15 and the resilient urging member 18 of the lower clamp member 17.
- the upper clamp member 15 is loaded by the spring 7.
- the thermal head 8 is brought into pressure contact with the platen roller 9. While the sheet clamping device is being moved in a direction of arrow 19, the thermal head 8 is energized by image signals to heat the head 8. The heat fuses the ink in the ink sheet 11 with the fused ink being transferred to the sheet 2.
- the sheet 2 is subjected to an increased tension. However, the sheet 2 will be undesirably shifted since it is firmly clamped between the upper and lower clamp members 15, 17.
- the hard, high-friction material 16 is formed of ceramic particles, the combination of such a material 16 with the resilient urging member prevents the frictional force therebetween from being reduced. Even if any dust is, present on the hard, high-friction material 16, they can be absorbed by the resilient urging member to provide a stabilized clamping force for a prolonged period without reduction of the frictional force. Consequently, the sheet 2 can be reliably held in place to provide a high-quality print with a substantial reduction in undesirable shift in printing.
- the present invention has been described as to the ceramic particles used in the hard, high-friction material 16, the present invention is not limited to such a configuration and may be similarly applied to a hard, high-friction material of sand paper.
- the pressure sheet contacting surface of an upper clamp member 25 may include a resilient urging member 28 while the pressure sheet contacting surface of a lower clamp member 27 may include a hard, high-friction material 26. This can provide the same advantages as in the first embodiment.
- the sheet clamping device of the present invention comprises one of two clamp members which includes its pressure sheet contacting surface of hard, high-friction material, with the other clamp member including its pressure sheet contacting surface of resilient material, the sheet can be reliably urged against the hard and high-friction member to increase the area of contact for holding the sheet. Further, any dust on the hard, high-friction member can be absorbed by the resilient urging member to prevent the frictional force from being reduced. Consequently, the sheet clamping device can provide a reduced shift of the sheet away from the desired position.
- the present invention may be applied to the paper feed device in the printer as described and also to any other sheet conveying systems.
Landscapes
- Handling Of Cut Paper (AREA)
- Advancing Webs (AREA)
- Handling Of Continuous Sheets Of Paper (AREA)
Abstract
A paper clamp for printer having a satisfactory clamping force which does not decrease even if dusts such as paper powder stick to it and being able to position paper with high reproducibility. The clamp is provided with pressing surfaces for clamping the paper at ends on one side of upper and lower clamp members, ends on the other side of which are rotatably supported independently of each other, wherein either one of the paper pressing surfaces is formed of an elastic pressing member and the other of the paper pressing surfaces is formed of a hard, highly frictional member such as ceramics, thus increasing the paper clamping force.
Description
- The present invention relates to a sheet clamping device for holding a sheet at one end when the sheet is being printed in a printer.
- Fig. 3 is a side view of a sheet clamping device constructed in accordance with the prior art and disclosed in Japanese Patent Laid-Open No. Hei 2-132471. The clamping device 1 conveys a
sheet 2 by moving in a direction shown byarrow 14 in Fig. 3 while holding thesheet 2 at one end. The sheet clamping device 1 comprises upper andlower clamp members sheet 2. Theupper clamp member 4 is pivotally supported at one end on asupport shaft 3, with the other end of the upper clamp member being adapted to engage thesheet 2. The engaging end of theupper clamp member 4 is biased against thelower clamp member 5 under the influence of aspring 7. On the other hand, the engaging end of thelower clamp member 5 includes afriction plate 6 of resilient material secured thereto. Thesheet 2 will be held between thefriction plate 6 on thelower clamp member 5 and theupper clamp member 4 biased against thelower clamp member 5 under the biasing force of thespring 7. - The right-hand portion of the Fig. 3 schematically shows a printing mechanism including a
thermal head 8. On printing, thesheet 2 is grasped, together with an ink sheet 11, between aplaten roller 9 and thethermal head 8. When the sheet clamping device 1 is moved in the direction ofarrow 14, the sheet is also fed in the same direction. At the same time, the respective heat emitting elements in thethermal head 8 are energized by image signals. The heat fuses the ink on the ink sheet 11 and the fused ink is transferred to thesheet 2 for printing. - As the
sheet 2 is being moved, the ink sheet 11 is also moved from an inksheet supply roller 13 to an ink sheet take-up roller 12. In the illustrated device, apinch roller 10 is provided to stabilize thesheet 2 on theplaten roller 9. - In the aforementioned arrangement, the coefficient of friction at the
friction plate 6 is insufficient to clamp thesheet 2. If any dirt or dust is deposited on thefriction plate 6, the clamping force is further reduced, resulting in slippage of thesheet 2 into misalignment. This will raise various problems such as printing shear, jamming and others. - Particularly when it is desired to make a color print, a color shift may be produced due to the printing shear since a plurality of printing operations are carried out onto the same sheet.
- In order to overcome the aforementioned problems in the prior art, an object of the present invention is to provide a sheet clamping device in a printer, which will not reduce the clamping force even if any dirt or dust is deposited therein and which can provide an improved reproducibility with respect to the sheet position.
- To this end, the present invention provides a sheet clamping device in a printer, comprising a lower clamp member, a support shaft disposed thereon at one end, and an upper clamp member pivotally supported on the support shaft. One of the upper and lower clamp members includes a sheet contacting surface of hard, high-friction material while the sheet contacting surface of the other clamp member includes a resilient urging member applied thereto. The hard, high-friction material may be a bonded body of ceramic particles or sand paper.
- In such an arrangement, a printing sheet can be reliably clamped and grasped between one sheet contacting surface of hard, high-friction material and another sheet contacting surface of resilient urging member. Even if any dust becomes deposited on the hard, high-friction layer, they can be absorbed by the resilient urging member without reduction of the clamping force. Therefore, the position of sheet can be repro duced with an increased accuracy.
- Fig. 1 is a side view of one embodiment of a sheet clamping device constructed in accordance with the present invention.
- Fig. 2 is a view showing another embodiment of the present invention.
- Fig. 3 is a side view of a sheet clamping device constructed in accordance with the prior art.
- In the drawings:
reference numeral 15 denotes an upper clamp member; 16 a hard, high-friction material; 17 a lower clamp member; and 18 a resilient urging member. - Referring to Fig. 1, there is shown one embodiment of a sheet clamping device constructed in accordance with the present invention which comprises
parts - The sheet clamping device comprises upper and
lower clamp members upper clamp member 15 is pivotally supported on asupport shaft 3 for rotational movement relative to thelower clamp member 17. The other end of each of the upper andlower clamp members resilient urging member 18 applied thereto, such as a rubber plate, a synthetic resin elastomer plate or the like. - In operation, the
upper clamp member 15 is pivoted about thesupport shaft 3 to provide an opening between the upper andlower clamp members sheet 2 is then inserted into the opening. Thereafter, the opening is closed to hold thesheet 2 between the hard, high-friction material 16 of theupper clamp member 15 and theresilient urging member 18 of thelower clamp member 17. Theupper clamp member 15 is loaded by thespring 7. Thus, thesheet 2 can be reliably clamped between the upper andlower clamp members thermal head 8 is brought into pressure contact with theplaten roller 9. While the sheet clamping device is being moved in a direction ofarrow 19, thethermal head 8 is energized by image signals to heat thehead 8. The heat fuses the ink in the ink sheet 11 with the fused ink being transferred to thesheet 2. During this operation, thesheet 2 is subjected to an increased tension. However, thesheet 2 will be undesirably shifted since it is firmly clamped between the upper andlower clamp members - Although the hard, high-friction material 16 is formed of ceramic particles, the combination of such a material 16 with the resilient urging member prevents the frictional force therebetween from being reduced. Even if any dust is, present on the hard, high-friction material 16, they can be absorbed by the resilient urging member to provide a stabilized clamping force for a prolonged period without reduction of the frictional force. Consequently, the
sheet 2 can be reliably held in place to provide a high-quality print with a substantial reduction in undesirable shift in printing. - Although the embodiment of the present invention has been described as to the ceramic particles used in the hard, high-friction material 16, the present invention is not limited to such a configuration and may be similarly applied to a hard, high-friction material of sand paper.
- As shown in Fig. 2, the pressure sheet contacting surface of an
upper clamp member 25 may include aresilient urging member 28 while the pressure sheet contacting surface of alower clamp member 27 may include a hard, high-friction material 26. This can provide the same advantages as in the first embodiment. - Since the sheet clamping device of the present invention comprises one of two clamp members which includes its pressure sheet contacting surface of hard, high-friction material, with the other clamp member including its pressure sheet contacting surface of resilient material, the sheet can be reliably urged against the hard and high-friction member to increase the area of contact for holding the sheet. Further, any dust on the hard, high-friction member can be absorbed by the resilient urging member to prevent the frictional force from being reduced. Consequently, the sheet clamping device can provide a reduced shift of the sheet away from the desired position.
- The present invention may be applied to the paper feed device in the printer as described and also to any other sheet conveying systems.
Claims (10)
- A sheet clamping device in a printer for conveying a printing sheet while holding said sheet at one end: said device comprising:(a) a lower clamp member including a pressure sheet contacting surface of hard, high-friction material;(b) an upper clamp member pivotally supported on a support shaft, said support shaft being fixedly mounted relative to said lower clamp member; and(c) a resilient urging member applied to the pressure sheet contacting surface of said upper clamp member.
- A sheet clamping device as defined in claim 1 wherein said hard, high-friction material comprises a bonded body of ceramic particles.
- A sheet clamping device as defined in claim 1 wherein said hard, high-friction material comprises sand paper.
- A sheet clamping device as defined in any one of claims 1, 2 and 3 wherein said upper clamp member is supported at one end on said support shaft, the other end of said upper clamp member including the pressure sheet contacting surface disposed thereon.
- A sheet clamping device as defined in any one of claims 1, 2 and 3 wherein a force holding the sheet is provided under the biasing force of a spring.
- A sheet clamping device in a printer for conveying a printing sheet while holding said sheet at one end: said device comprising:(a) a lower clamp member;(b) an upper clamp member pivotally supported on a support shaft fixedly mounted on said lower clamp member, said upper clamp member including a pressure sheet contacting surface of hard, high-friction material; and(c) a resilient urging member applied to the pressure sheet contacting surface of said lower clamp member.
- A sheet clamping device as defined in claim 6 wherein said hard, high-friction material comprises a bonded body of ceramic particles.
- A sheet clamping device as defined in claim 6 wherein said hard, high-friction material comprises sand paper.
- A sheet clamping device as defined in any one of claims 6, 7 and 8 wherein said upper clamp member is supported at one end on said support shaft, the other end of said upper clamp member including the pressure sheet contacting surface disposed thereon.
- A sheet clamping device as defined in any one of claims 6, 7 and 8 wherein a force holding the sheet is provided under the biasing force of a spring.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63659/91 | 1991-03-06 | ||
JP6365991A JPH04278376A (en) | 1991-03-06 | 1991-03-06 | Paper clamper in printer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0528049A1 true EP0528049A1 (en) | 1993-02-24 |
EP0528049A4 EP0528049A4 (en) | 1993-08-11 |
Family
ID=13235698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920905969 Withdrawn EP0528049A4 (en) | 1991-03-06 | 1992-03-06 | Paper clamp for printer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0528049A4 (en) |
JP (1) | JPH04278376A (en) |
WO (1) | WO1992015460A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0699538A3 (en) * | 1994-08-31 | 1997-03-12 | Altech Company Limited | Printing apparatus |
FR2919522A1 (en) * | 2007-08-03 | 2009-02-06 | Born To Print Sarl | Flexible band e.g. web paper, printing device for self-service printing terminal, has displacement unit formed by tensioning unit for allowing band to be stressed from initial position to final position in permanent manner |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106743883B (en) * | 2017-01-12 | 2019-12-13 | 深圳弘美数码纺织技术有限公司 | Paper head conveying device and paper feeding equipment |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2340208A1 (en) * | 1976-02-06 | 1977-09-02 | Sodern | Printing surface drive mechanism - has coating with protrusions on flat component bearing against sheets printed |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60287Y2 (en) * | 1980-04-14 | 1985-01-07 | 株式会社 ソ−ケン | Typewriter platen paper holding device |
JPS6146670A (en) * | 1984-08-10 | 1986-03-06 | Ricoh Co Ltd | Recording method of color recorder |
JPS61100483A (en) * | 1984-10-23 | 1986-05-19 | Sharp Corp | Paper-feeding system for color recorder |
JPS61123356A (en) * | 1984-11-20 | 1986-06-11 | Matsushita Electric Ind Co Ltd | Heat sensitive copying recorder |
JPS61158481A (en) * | 1984-12-28 | 1986-07-18 | Matsushita Electric Ind Co Ltd | Thermal transfer recording method |
JPH0698800B2 (en) * | 1985-09-25 | 1994-12-07 | シャープ株式会社 | Recording device |
JPS63161746U (en) * | 1987-04-06 | 1988-10-21 | ||
JPH02134271A (en) * | 1988-11-15 | 1990-05-23 | Mitsubishi Electric Corp | Printing paper clamp apparatus of printer |
JPH02144449U (en) * | 1989-05-11 | 1990-12-07 |
-
1991
- 1991-03-06 JP JP6365991A patent/JPH04278376A/en active Pending
-
1992
- 1992-03-06 WO PCT/JP1992/000269 patent/WO1992015460A1/en not_active Application Discontinuation
- 1992-03-06 EP EP19920905969 patent/EP0528049A4/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2340208A1 (en) * | 1976-02-06 | 1977-09-02 | Sodern | Printing surface drive mechanism - has coating with protrusions on flat component bearing against sheets printed |
Non-Patent Citations (1)
Title |
---|
See also references of WO9215460A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0699538A3 (en) * | 1994-08-31 | 1997-03-12 | Altech Company Limited | Printing apparatus |
FR2919522A1 (en) * | 2007-08-03 | 2009-02-06 | Born To Print Sarl | Flexible band e.g. web paper, printing device for self-service printing terminal, has displacement unit formed by tensioning unit for allowing band to be stressed from initial position to final position in permanent manner |
Also Published As
Publication number | Publication date |
---|---|
JPH04278376A (en) | 1992-10-02 |
EP0528049A4 (en) | 1993-08-11 |
WO1992015460A1 (en) | 1992-09-17 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 19921103 |
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17Q | First examination report despatched |
Effective date: 19950727 |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 19951207 |