CA1100538A - Method and apparatus for feeding documents with variable driving force - Google Patents
Method and apparatus for feeding documents with variable driving forceInfo
- Publication number
- CA1100538A CA1100538A CA325,545A CA325545A CA1100538A CA 1100538 A CA1100538 A CA 1100538A CA 325545 A CA325545 A CA 325545A CA 1100538 A CA1100538 A CA 1100538A
- Authority
- CA
- Canada
- Prior art keywords
- document
- driving force
- nip pressure
- roller
- feeding
- 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
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims 2
- 208000036366 Sensation of pressure Diseases 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
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
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
- B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/22—Distance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/22—Distance
- B65H2511/224—Nip between rollers, between belts or between rollers and belts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
METHOD AND APPARATUS FOR FEEDING
DOCUMENTS WITH VARIABLE DRIVING FORCE
Abstract To feed sheet material such as punched cards, copy sheets and the like along a given feed path, the driving force applied to the material is altered in dependence upon the specific driving force requirements at any given portion of the feed path. Where a pair of feed rollers are used, (a drive roller and or idler roller), the driving force is varied by selectively varying the nip pressure between the rollers.
Control of nip pressure can be effected by electro-magnetic means operatively connected one or other of the idler and drive rollers.
DOCUMENTS WITH VARIABLE DRIVING FORCE
Abstract To feed sheet material such as punched cards, copy sheets and the like along a given feed path, the driving force applied to the material is altered in dependence upon the specific driving force requirements at any given portion of the feed path. Where a pair of feed rollers are used, (a drive roller and or idler roller), the driving force is varied by selectively varying the nip pressure between the rollers.
Control of nip pressure can be effected by electro-magnetic means operatively connected one or other of the idler and drive rollers.
Description
ll~Q538 This invention relates generally to the feeding of sheet material and more specifically to the feeding of separate sheets of material which may be, for example, in the form of computer cards, sheets of paper for use in various printing processes, etc.
Where a card or sheet is to be delivered along a physical path to a registration gate, a considerable driving force is necessary to overcome frictional drag. In the case of a card handling device, for example, a high frictional drag is encountered by a card in leaving the hopper.
If the driving force applied is too high, it is found that the leading edge of the card or sheet is damaged upon impact with the regis-tration gate. This can adversely affect subsequent processing of the card or sheet. Too low a driving force could result in undesirable slippage.
In the face of these considerations, it has heretofore been the practice to select an optimum driving force which, of course, is merely a compromise and fails to provide a totally acceptable, universal answer to the problem.
Broadly stated, the present invention resides in the improvement of methods and apparatus for feeding sheet material, which improvement, in its basic aspect, calls for the capability of selectively varying the ` driving force applied to the sheet material as required by varying conditions and situations met with along the feed path.
Essentially, the improvement is achieved by simply varying nip pressure between the feed rolls which drive the card or sheet along the path. Since driving force is proportional to nip pressure, the mag-nitude of the driving force can be readily and accurately changed ` for any given card stock or sheet weight by simply varying the force with which an idler roller is moved into operative relationship with its drive roller and the sheet material to be fed.
The invention will now be more specifically described as embodied ;n a card transport. It will be understood, however, that the use of _l_ ~0~538 1 the invention is not limited to such an embodiment.
To assist in describing the embodiment, the following drawing figures are appended:
Fig. 1 - A schematic representation of a card transport embodying the invention.
Fig. 2 - A schematic representat;on showing an example of a current regulation system useable in an embodiment of the invention.
With reference to Figure 1, a card hopper (10) includes a moveable card support plate (12) and an upper housing member (14) in which is located a roller (16) which, in operation, is continuously rotating by means of a motor (not shown).
Cards (18), which may be of variable length, are inserted into the hopper through a hopper loading aperture (20) and are supported and urged upwardly, as is known, by the card support plate (12). Again, in known manner, rotation of roller (16) in the clockwise direction picks the top card when the roller is lowered into operative position and drives it under the knife element (22) through exit throat (24) onto feed path (26).
When the card's leading edge is detected by photo-sensor (28), idler roller (30) is forced downwardly into driving relationship with drive roller (32) and, at the same time, roller (16) and pressure roller (34) are raised.
As shown in Fig. 1, idler roller (30) is rotatably mounted at one end of an arm (36) which is pivotally mounted as at (38).
Connected to the other end of arm (361 is the armature (40) which, in conjunction with magnetic yoke (42) of the electro-magnet device (44) is operable to raise and lower idler roller (30) relative to drive roller (32) by pivoting the arm (36).
The electro magnet device (44) is energized in response to the signal generated by photosensor (28) upon detection of the leading edge of a card.
~ C~S 3 8 1 It will be noted that the distance between rollers (32-34) and roller (16) is such that the shortest card can be driven to the photo-sensor (28) by roller (16) alone.
From the point where the card is detected by photosensor (28), it is driven along feed path (26) solely by drive roller (32) and idler or pressure roller (30) until its leading edge is again detected, this time by photosensor (46) at the READ center-line. In response to a signal generated by photosensor (46) idler roller (30) is raised causing the card to stop, momentarily, short of registration gate (48).
Registration gate (48) is then lowered against the feed path (26), idler roller (30) is again forced down into driving relationship with drive roller (32) and the card is fed into contact with registration gate (48).
As noted above, detection of the card's leading edge by the first photosensor (28) had raised pressure roller (34) such that the card has a clear, unobstructed path to the gate (48).
As the card registers against gate (48), drive roll (32) slips on the card's under surface and after pressure roller (34) is again lowered, idler roller (30) is lifted. As a result, the card is accurately posi-tioned with respect to gate (48) and incrementer (50).
It will be appreciated that as the card is moved from the hopper to the READ center-line, its passage is resisted to a relatively high degree by virtue of frictional engagement with the card path and the resistance encountered from conventional spring-loaded card aligners.
Thus, at this stage, a relatively high driving force is required to move the card along the path. The necessary driving force is achieved by applying full rated current to the electro-magnet device (44) and by appropriate adjustment of the gap (52) between armature (40 and magnet yoke (42). The smaller the gap (52) the greater the pull upon armature 40, hence the greater the nip pressure.
In moving the card from the READ center-line to gate (48), a relatively low driving force is desired to avoid damage to the leading --` 1100538 1 edge of the card.
The lower driYing force is achieved by a second magnet driyer circuit which includes, for example, a potentiometer in series with the magnet coil of electro-magnet device (44). By appropriately increasing the resistance of the potentiometer, the current through the magnet coil is reduced and the downward force with which idler roller (30) is driven agalnst, or towards, drive roller (32) is decreased, thus decreasing the nip pressure between the rollers (30-32) relative to the pressure gen-erated with full current flowing through the magnet coil.
Turning to Figure 2, it will be seen that a plurality of magnet driver circuits can be provided, each connected in series to the magnet - coil of electro-magnet device (44) through respective potentiometersand diodes. By setting each of the various potentiometers at different resistances, nip pressure can be selectively changed for driving a card or sheet through various different sections of a feed path in response ; to feedback signals generated by various elements such as location, velocity or acceleration sensors.
Alternately, an operational amplifier could be used in place of discrete drivers to provide infinitely variable control.
'`~
:
Where a card or sheet is to be delivered along a physical path to a registration gate, a considerable driving force is necessary to overcome frictional drag. In the case of a card handling device, for example, a high frictional drag is encountered by a card in leaving the hopper.
If the driving force applied is too high, it is found that the leading edge of the card or sheet is damaged upon impact with the regis-tration gate. This can adversely affect subsequent processing of the card or sheet. Too low a driving force could result in undesirable slippage.
In the face of these considerations, it has heretofore been the practice to select an optimum driving force which, of course, is merely a compromise and fails to provide a totally acceptable, universal answer to the problem.
Broadly stated, the present invention resides in the improvement of methods and apparatus for feeding sheet material, which improvement, in its basic aspect, calls for the capability of selectively varying the ` driving force applied to the sheet material as required by varying conditions and situations met with along the feed path.
Essentially, the improvement is achieved by simply varying nip pressure between the feed rolls which drive the card or sheet along the path. Since driving force is proportional to nip pressure, the mag-nitude of the driving force can be readily and accurately changed ` for any given card stock or sheet weight by simply varying the force with which an idler roller is moved into operative relationship with its drive roller and the sheet material to be fed.
The invention will now be more specifically described as embodied ;n a card transport. It will be understood, however, that the use of _l_ ~0~538 1 the invention is not limited to such an embodiment.
To assist in describing the embodiment, the following drawing figures are appended:
Fig. 1 - A schematic representation of a card transport embodying the invention.
Fig. 2 - A schematic representat;on showing an example of a current regulation system useable in an embodiment of the invention.
With reference to Figure 1, a card hopper (10) includes a moveable card support plate (12) and an upper housing member (14) in which is located a roller (16) which, in operation, is continuously rotating by means of a motor (not shown).
Cards (18), which may be of variable length, are inserted into the hopper through a hopper loading aperture (20) and are supported and urged upwardly, as is known, by the card support plate (12). Again, in known manner, rotation of roller (16) in the clockwise direction picks the top card when the roller is lowered into operative position and drives it under the knife element (22) through exit throat (24) onto feed path (26).
When the card's leading edge is detected by photo-sensor (28), idler roller (30) is forced downwardly into driving relationship with drive roller (32) and, at the same time, roller (16) and pressure roller (34) are raised.
As shown in Fig. 1, idler roller (30) is rotatably mounted at one end of an arm (36) which is pivotally mounted as at (38).
Connected to the other end of arm (361 is the armature (40) which, in conjunction with magnetic yoke (42) of the electro-magnet device (44) is operable to raise and lower idler roller (30) relative to drive roller (32) by pivoting the arm (36).
The electro magnet device (44) is energized in response to the signal generated by photosensor (28) upon detection of the leading edge of a card.
~ C~S 3 8 1 It will be noted that the distance between rollers (32-34) and roller (16) is such that the shortest card can be driven to the photo-sensor (28) by roller (16) alone.
From the point where the card is detected by photosensor (28), it is driven along feed path (26) solely by drive roller (32) and idler or pressure roller (30) until its leading edge is again detected, this time by photosensor (46) at the READ center-line. In response to a signal generated by photosensor (46) idler roller (30) is raised causing the card to stop, momentarily, short of registration gate (48).
Registration gate (48) is then lowered against the feed path (26), idler roller (30) is again forced down into driving relationship with drive roller (32) and the card is fed into contact with registration gate (48).
As noted above, detection of the card's leading edge by the first photosensor (28) had raised pressure roller (34) such that the card has a clear, unobstructed path to the gate (48).
As the card registers against gate (48), drive roll (32) slips on the card's under surface and after pressure roller (34) is again lowered, idler roller (30) is lifted. As a result, the card is accurately posi-tioned with respect to gate (48) and incrementer (50).
It will be appreciated that as the card is moved from the hopper to the READ center-line, its passage is resisted to a relatively high degree by virtue of frictional engagement with the card path and the resistance encountered from conventional spring-loaded card aligners.
Thus, at this stage, a relatively high driving force is required to move the card along the path. The necessary driving force is achieved by applying full rated current to the electro-magnet device (44) and by appropriate adjustment of the gap (52) between armature (40 and magnet yoke (42). The smaller the gap (52) the greater the pull upon armature 40, hence the greater the nip pressure.
In moving the card from the READ center-line to gate (48), a relatively low driving force is desired to avoid damage to the leading --` 1100538 1 edge of the card.
The lower driYing force is achieved by a second magnet driyer circuit which includes, for example, a potentiometer in series with the magnet coil of electro-magnet device (44). By appropriately increasing the resistance of the potentiometer, the current through the magnet coil is reduced and the downward force with which idler roller (30) is driven agalnst, or towards, drive roller (32) is decreased, thus decreasing the nip pressure between the rollers (30-32) relative to the pressure gen-erated with full current flowing through the magnet coil.
Turning to Figure 2, it will be seen that a plurality of magnet driver circuits can be provided, each connected in series to the magnet - coil of electro-magnet device (44) through respective potentiometersand diodes. By setting each of the various potentiometers at different resistances, nip pressure can be selectively changed for driving a card or sheet through various different sections of a feed path in response ; to feedback signals generated by various elements such as location, velocity or acceleration sensors.
Alternately, an operational amplifier could be used in place of discrete drivers to provide infinitely variable control.
'`~
:
Claims (6)
1. In a method of feeding a document along a given path by feed roller means, the improvement comprising the step of selectively varying nip pressure between said feed roller means to effect variable control of the driving force applied to said document as such document passes over different portions of said given path.
2. In a method of feeding a document along a given path by feed roller means from a first position to a second position, the steps of:
applying a first nip pressure between said feed roller means to feed the document from said first position to an intermediate position with a first predetermined driving force, applying a second nip pressure between said feed roller means to feed the document from said intermediate position to said second posi-tion with a second predetermined driving force, the variations in driving force being effected to limit potential damage to a document in transit along said given path.
applying a first nip pressure between said feed roller means to feed the document from said first position to an intermediate position with a first predetermined driving force, applying a second nip pressure between said feed roller means to feed the document from said intermediate position to said second posi-tion with a second predetermined driving force, the variations in driving force being effected to limit potential damage to a document in transit along said given path.
3. In a method of feeding a document as defined in claim 3, the further steps of sensing arrival of the document at said intermediate position and generating a signal to change the nip pressure and produce said second driving force.
4. Apparatus for feeding a document along a given path including feed roller means having a driven roller and an idler roller means for driving said driven roller, and means for selectively varying nip pres-sure between said rollers to vary the driving force exerted thereby on said document; said means for selectively varying nip pressure being connected to said idler roller, and sensing means operable to provide a signal upon arrival of said document at a preselected position on said given path, said means for selectively varying nip pressure being re-sponsive to said signal.
5. Apparatus for feeding a document as defined in claim 4 wherein said means for selectively varying nip pressure includes a pivotable arm, said idler roller being rotatably mounted at one end of said arm for movement towards and away from said driven roller; electromagnetic means connected to said pivotable arm and operative in response to a signal from said sensing means to pivot said arm and move said idler roller relative to said driven roller.
6. Apparatus for feeding a document as defined in claim 5 and further including current regulating means connected to said electromagnetic means whereby, upon receiving a signal from said sensing means, the electromagnetic means will pivot said arm to a degree dependent upon the current flow permitted by said current regulating means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA325,545A CA1100538A (en) | 1979-04-11 | 1979-04-11 | Method and apparatus for feeding documents with variable driving force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA325,545A CA1100538A (en) | 1979-04-11 | 1979-04-11 | Method and apparatus for feeding documents with variable driving force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1100538A true CA1100538A (en) | 1981-05-05 |
Family
ID=4113980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA325,545A Expired CA1100538A (en) | 1979-04-11 | 1979-04-11 | Method and apparatus for feeding documents with variable driving force |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1100538A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4718658A (en) * | 1986-02-27 | 1988-01-12 | Nippon Seimitsu Kogyo Kabushiki Kaisha | Sheet feeding system using detachable sheet storage unit in image processing device |
| US4778169A (en) * | 1987-04-08 | 1988-10-18 | Ziyad, Inc. | Feeders for sheetlike articles |
| US6672587B1 (en) * | 1999-05-28 | 2004-01-06 | Heidelberger Druckmaschinen Ag | Multiple-sheet monitoring device |
| CN111409367A (en) * | 2020-04-17 | 2020-07-14 | 杭州放温科技有限公司 | Electromagnetic diameter-variable paper jam-preventing office printer |
-
1979
- 1979-04-11 CA CA325,545A patent/CA1100538A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4718658A (en) * | 1986-02-27 | 1988-01-12 | Nippon Seimitsu Kogyo Kabushiki Kaisha | Sheet feeding system using detachable sheet storage unit in image processing device |
| US4778169A (en) * | 1987-04-08 | 1988-10-18 | Ziyad, Inc. | Feeders for sheetlike articles |
| US6672587B1 (en) * | 1999-05-28 | 2004-01-06 | Heidelberger Druckmaschinen Ag | Multiple-sheet monitoring device |
| CN111409367A (en) * | 2020-04-17 | 2020-07-14 | 杭州放温科技有限公司 | Electromagnetic diameter-variable paper jam-preventing office printer |
| CN111409367B (en) * | 2020-04-17 | 2021-11-09 | 临沂市蓝晶光电科技有限公司 | Electromagnetic diameter-variable paper jam-preventing office printer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |