CA1156274A - Roller normal force applicator for bottom article feeder - Google Patents
Roller normal force applicator for bottom article feederInfo
- Publication number
- CA1156274A CA1156274A CA000376696A CA376696A CA1156274A CA 1156274 A CA1156274 A CA 1156274A CA 000376696 A CA000376696 A CA 000376696A CA 376696 A CA376696 A CA 376696A CA 1156274 A CA1156274 A CA 1156274A
- Authority
- CA
- Canada
- Prior art keywords
- articles
- normal force
- feed belt
- driven feed
- stack
- 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
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
- B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
- B65H3/52—Friction retainers acting on under or rear side of article being separated
- B65H3/5207—Non-driven retainers, e.g. movable retainers being moved by the motion of the article
- B65H3/523—Non-driven retainers, e.g. movable retainers being moved by the motion of the article the retainers positioned over articles separated from the bottom of the pile
- B65H3/5238—Retainers of the pad-type, e.g. friction pads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A normal force applicator for a bottom feeder. The normal force applicator forms a rolling nip between a roller and a drive belt designed to apply force to only a few of the bottom articles in the stack to be fed at a time. Therolling nip ensures a constant normal force between the articles and the feed belt that feeds articles to a separator even using a very low applied force, independent of stack size. Also, since the roller contacts only a few of the bottom articles, additional articles can be added to the stack readily even while the feeder is operating.
A normal force applicator for a bottom feeder. The normal force applicator forms a rolling nip between a roller and a drive belt designed to apply force to only a few of the bottom articles in the stack to be fed at a time. Therolling nip ensures a constant normal force between the articles and the feed belt that feeds articles to a separator even using a very low applied force, independent of stack size. Also, since the roller contacts only a few of the bottom articles, additional articles can be added to the stack readily even while the feeder is operating.
Description
A ROLLER NORMAL FORCE APPLICATOR FOR BOTTOM ARTICLE FEEDER
.
The invention relates to a feeder for serially feeding the bottom article, such as a sheet of paper, an envelope or a magazine, from a stack of S such unseparated articles. Specifically, the invention relates to a normal force applicator, which utilizes a roller, which roller presses on the leading area ofonly a few of the bottom articles in a stack of articles ensuring a reliable feed to an article separator. The article separator may be, for example, a conventional friction retard device using a friction retard pad. The individual article thus 10 separated feeds articles to the next processing station.
There are numerous applications in which a bottom feeder to feed articles serially from an unseparated stack of articles can be used, for example, to feed sheets of paper serially to a printer or copier or to feed envelopes to a printer or labeler. Obviously, many more examples could be given. One aspect 15 common to all bottom feeders is the difficulty experienced in reliably driving and feeding but one article from the set of stacked articles. The reliability ofbottom feeders can be affected by variations in the height of the stack of articles. For example, where only a few lightweight articles, such as sheets of thin paper, are in the stack, there may not be enough weight, that is, normal 20 force, on the stack to make the feeder work properly. To alleviate such problems, a normal force applicator can be used.
Conventional normal force applicators are designed to press down on the top of the stack of articles to hold the stack down and to provide sufficient engagement force between the bottommost article of the stack of articles and 25 the bottom feeder. The normal force applicators can be a weighted or spring-loaded plate1 bail bar or the like. One problem with such normal force applicators is that they must be removed or lifted out of the way before more articles can be added to the top of the stack. Also, where the stack is relatively large, a larger force may be required where the force is applied through the 30 entire stack to ensure proper feeder operation. The invention as claimed is intended to provide a remedy. It solves the problem of how to provide a reliableserial bottom feeder for articles, which feeder also allows for the convenient addition of further articles to the top of the stack.
A ~ ~
1~5G'~ ,'4 -la-An aspect of the invention is as follows:
An apparatus for assisting bottom feeding an article from a stack of articles to a separator, which comprises:
an input tray for holding a stack of articles, said input tray having a slot formed therein;
a driven feed belt positioned to protrude through said slot in said input tray in feeding relationship to a stack of articles on said input tray;
a normal force applicator roller positioned in spaced relationship to said driven feed belt to form a rolling nip therewith, article guide means for guiding the bottom articles in the stack of articles to said nip formed by said normal force applicator roller and said driven feed belt;
means for urging said normal force applicator roller toward said driven feed belt, said means being of strength sufficient to allow more than one article to pass into said rolling nip under the influence of a moving driven feed belt;
separator means positioned in spaced relationship to said driven feed belt and positioned to receive articles passing through said rolling nip, said separator means being designed to allow the passage of only one article at a time therethrough.
One way of carrying out the invention is described in detail below with reference to drawings, which illustrate only one specific embodiment, in which:
.
' 4 Figure 1 is an end view looking into the normal force applicator from the direction of article input.
Figure 2 is a side-sectional view of the normal force applicator of this invention taken along lines 2-2 of Figure 1 and in addition shows a typical5 friction retard separator.
Figure 3 is a partial side sectional view of the normal force appli-cator of this invention, which shows how the normal force applicator interacts with the stack of articles to be fed, the feed belt and the friction retard assembly.
Figure 4 is a top view of the frame for the normal force applicator of this invention.
Figure 5 is a top view of the friction retard pad support frame for use with the present invention.
Referring now to the Figures, an input tray 1 is provided on which a stack of articles 3 (see Figure 3) is provided. The stack of articles 3 may be, for example, a stack of paper or envelopes or any suitable article that it is desired to feed serially to a work station. Protruding through a slot 9 in the input tray 1 in feeding relationship to the stack of articles 3 is driven feed belt 5. Drivenfeed belt 5 is driven in the direction shown by the arrows (see Figures 2 and 3) by driven feed belt pulleys 7. The means for driving driven feed belt pulleys 7 is not shown although obviously one of the driven feed belt pulleys 7 could be, for example, mounted on the shaft of a motor; or, as another example, the driven feed belt 5 could be driven by frictional contact with a third pulley, and pulleys 7 would not be driven.
The normal force applicator generally designated as 11 includes a roller support frame 13, which is connected by bolts 15 to base 17. Roller support frame 13 has formed therein slot 19 (see Figure 4) and aperture 21, bothof which traverse the complete height of roller support frame 13 as shown in Figure 2. Slot 19 acts as a guide for normal force applicator roller support 23,which is mounted for slidable movement in the space defined by slot 19 and base 17 when it is attached to base 17, Normal force applicator roller support 23 hasformed thereon roller support arms 25 (see Figure 1) between which normal force applicator roller 27 is mounted for rotation. Normal force applicator roller support 23 is urged downwardly against driven feed belt 5 by normal force applicator spring 29 to form a rolling nip 2~ therewith. Normal force applicatorspring 29 in this instance is attached to pin 31 in slot 33 on normal force 1 ~G~7~
applicator roller support 23 and to pin 35 in slot 37 on roller support frame 13.
Also attached to base 17 is separator generally designated as 16, which in this instance comprises friction retard pad support frame 39 (see Figure 5). Frictionretard pad support frame 39 has a depression or slot 41 and an aperture 43 formed therein. Friction retard pad support frame 39 is bolted by bolt means (not shown) to base 17. Friction retard pad support 45 is mounted for sliding motion in the space formed by slot 41 when it is attached to base 17. Attached to the bottom of friction retard pad support 45 is friction retard pad 47.
Friction retard pad 47 is urged downward into contact with driven feed belt 5 byfriction retard pad spring 49, which is held in aperture 43 of friction retard pad support 39 by shoulder 51.
In operation a stack of articles 3 is placed in input tray 1. Article guide means 53 (see Figure 3) is positioned such that none of the articles can rest above a centerline 55 of the normal force applicator roller drawn parallel to the direction of feed of the articles. This encourages the articles to be drawn intothe rolling nip 28 formed between normal force applicator roller 27 and driven feed belt 5. When it is desired to feed an article, the driven feed belt 5 is driven by means (not shown) in the direction of travel of the fed articles as shown by arrow 59 (see Figure 3). The movement of driven feed belt 5 in the direction shown by the arrow 57 (see Figure 3) causes normal force applicator roller 27 toturn in the direction shown by arrow 61 ~see Pigure 3). Normal force applicator spring 29 urges normal force applicator roller 27 downward against the top of the articles present (usually two or three) in the rolling nip 28 formed by normal force applicator roller 27 and driven feed belt 5. The normal force applicator spring 29 is adjusted so that it will allow a few articles to be brought into nip 28 under the influence of a moving feed belt 5. The coefficient of friction betweendriven belt 5 and the bottom article of the stack of articles 3 and the rolling motion of normal force applicator roller 27 causes two or more articles from thestack of articles 3 to be drawn into the rolling nip 28 formed between normal force applicator roller 27 and driven feed belt 5. Since normal force applicatorroller 27 is pressed against only a few of the bottom articles in the stack of articles 3, very little force is required to ensure feed of an article, even an article whose leading edge may not lie flat. Similarly, since normal force applicator roller 27 applies a force to only a few of the bottom articles in a stack of articles 3, the top of the stack of articles 3 is unencumbered allowingthe addition of more articles to the stack of articles 3 even while the feeder is 1 ~S~j~74 operating. The a~ticles in the stack of articles 3, which are moved into the rolling nip 28 formed between normal force applicator roller 27 and driven feed belt 5 by the movement of driven feed belt 5, are then brought into contact withfriction retard pad 47. The coefficient of friction between driven feed belt 5 5 and the bottom article of the stack of articles 3 is chosen to be higher than the coefficient of friction between friction retard pad 47 and the same article so that the article can be moved between the friction retard pad 47 and driven feedbelt 5 when driven feed belt 5 is operating. The friction retard pad 47 applies sufficient force to block the feed of the article next above the bottom article 10 causing the friction retard pad 47 to act as an article separator.
Other types of separators may also be used with the present normal force applicator concept. It has been found that the present normal force applicator will operate reliably feeding ordinary sheets of paper or envelopes with no adjustments being required. Also, typically only 100 to 150 grams of 15 force are required for a normal force applicator roller measuring about 1/4 inch in diameter and about 3/8 inch in length.
Although specific embodiments and components have been described, it will be understood by those skilled in the art that various changes in the form and details may be made therein without departing from the spirit and scope of 20 the invention. All such changes in form and detail should be considered as encompassed by the following claims.
.
The invention relates to a feeder for serially feeding the bottom article, such as a sheet of paper, an envelope or a magazine, from a stack of S such unseparated articles. Specifically, the invention relates to a normal force applicator, which utilizes a roller, which roller presses on the leading area ofonly a few of the bottom articles in a stack of articles ensuring a reliable feed to an article separator. The article separator may be, for example, a conventional friction retard device using a friction retard pad. The individual article thus 10 separated feeds articles to the next processing station.
There are numerous applications in which a bottom feeder to feed articles serially from an unseparated stack of articles can be used, for example, to feed sheets of paper serially to a printer or copier or to feed envelopes to a printer or labeler. Obviously, many more examples could be given. One aspect 15 common to all bottom feeders is the difficulty experienced in reliably driving and feeding but one article from the set of stacked articles. The reliability ofbottom feeders can be affected by variations in the height of the stack of articles. For example, where only a few lightweight articles, such as sheets of thin paper, are in the stack, there may not be enough weight, that is, normal 20 force, on the stack to make the feeder work properly. To alleviate such problems, a normal force applicator can be used.
Conventional normal force applicators are designed to press down on the top of the stack of articles to hold the stack down and to provide sufficient engagement force between the bottommost article of the stack of articles and 25 the bottom feeder. The normal force applicators can be a weighted or spring-loaded plate1 bail bar or the like. One problem with such normal force applicators is that they must be removed or lifted out of the way before more articles can be added to the top of the stack. Also, where the stack is relatively large, a larger force may be required where the force is applied through the 30 entire stack to ensure proper feeder operation. The invention as claimed is intended to provide a remedy. It solves the problem of how to provide a reliableserial bottom feeder for articles, which feeder also allows for the convenient addition of further articles to the top of the stack.
A ~ ~
1~5G'~ ,'4 -la-An aspect of the invention is as follows:
An apparatus for assisting bottom feeding an article from a stack of articles to a separator, which comprises:
an input tray for holding a stack of articles, said input tray having a slot formed therein;
a driven feed belt positioned to protrude through said slot in said input tray in feeding relationship to a stack of articles on said input tray;
a normal force applicator roller positioned in spaced relationship to said driven feed belt to form a rolling nip therewith, article guide means for guiding the bottom articles in the stack of articles to said nip formed by said normal force applicator roller and said driven feed belt;
means for urging said normal force applicator roller toward said driven feed belt, said means being of strength sufficient to allow more than one article to pass into said rolling nip under the influence of a moving driven feed belt;
separator means positioned in spaced relationship to said driven feed belt and positioned to receive articles passing through said rolling nip, said separator means being designed to allow the passage of only one article at a time therethrough.
One way of carrying out the invention is described in detail below with reference to drawings, which illustrate only one specific embodiment, in which:
.
' 4 Figure 1 is an end view looking into the normal force applicator from the direction of article input.
Figure 2 is a side-sectional view of the normal force applicator of this invention taken along lines 2-2 of Figure 1 and in addition shows a typical5 friction retard separator.
Figure 3 is a partial side sectional view of the normal force appli-cator of this invention, which shows how the normal force applicator interacts with the stack of articles to be fed, the feed belt and the friction retard assembly.
Figure 4 is a top view of the frame for the normal force applicator of this invention.
Figure 5 is a top view of the friction retard pad support frame for use with the present invention.
Referring now to the Figures, an input tray 1 is provided on which a stack of articles 3 (see Figure 3) is provided. The stack of articles 3 may be, for example, a stack of paper or envelopes or any suitable article that it is desired to feed serially to a work station. Protruding through a slot 9 in the input tray 1 in feeding relationship to the stack of articles 3 is driven feed belt 5. Drivenfeed belt 5 is driven in the direction shown by the arrows (see Figures 2 and 3) by driven feed belt pulleys 7. The means for driving driven feed belt pulleys 7 is not shown although obviously one of the driven feed belt pulleys 7 could be, for example, mounted on the shaft of a motor; or, as another example, the driven feed belt 5 could be driven by frictional contact with a third pulley, and pulleys 7 would not be driven.
The normal force applicator generally designated as 11 includes a roller support frame 13, which is connected by bolts 15 to base 17. Roller support frame 13 has formed therein slot 19 (see Figure 4) and aperture 21, bothof which traverse the complete height of roller support frame 13 as shown in Figure 2. Slot 19 acts as a guide for normal force applicator roller support 23,which is mounted for slidable movement in the space defined by slot 19 and base 17 when it is attached to base 17, Normal force applicator roller support 23 hasformed thereon roller support arms 25 (see Figure 1) between which normal force applicator roller 27 is mounted for rotation. Normal force applicator roller support 23 is urged downwardly against driven feed belt 5 by normal force applicator spring 29 to form a rolling nip 2~ therewith. Normal force applicatorspring 29 in this instance is attached to pin 31 in slot 33 on normal force 1 ~G~7~
applicator roller support 23 and to pin 35 in slot 37 on roller support frame 13.
Also attached to base 17 is separator generally designated as 16, which in this instance comprises friction retard pad support frame 39 (see Figure 5). Frictionretard pad support frame 39 has a depression or slot 41 and an aperture 43 formed therein. Friction retard pad support frame 39 is bolted by bolt means (not shown) to base 17. Friction retard pad support 45 is mounted for sliding motion in the space formed by slot 41 when it is attached to base 17. Attached to the bottom of friction retard pad support 45 is friction retard pad 47.
Friction retard pad 47 is urged downward into contact with driven feed belt 5 byfriction retard pad spring 49, which is held in aperture 43 of friction retard pad support 39 by shoulder 51.
In operation a stack of articles 3 is placed in input tray 1. Article guide means 53 (see Figure 3) is positioned such that none of the articles can rest above a centerline 55 of the normal force applicator roller drawn parallel to the direction of feed of the articles. This encourages the articles to be drawn intothe rolling nip 28 formed between normal force applicator roller 27 and driven feed belt 5. When it is desired to feed an article, the driven feed belt 5 is driven by means (not shown) in the direction of travel of the fed articles as shown by arrow 59 (see Figure 3). The movement of driven feed belt 5 in the direction shown by the arrow 57 (see Figure 3) causes normal force applicator roller 27 toturn in the direction shown by arrow 61 ~see Pigure 3). Normal force applicator spring 29 urges normal force applicator roller 27 downward against the top of the articles present (usually two or three) in the rolling nip 28 formed by normal force applicator roller 27 and driven feed belt 5. The normal force applicator spring 29 is adjusted so that it will allow a few articles to be brought into nip 28 under the influence of a moving feed belt 5. The coefficient of friction betweendriven belt 5 and the bottom article of the stack of articles 3 and the rolling motion of normal force applicator roller 27 causes two or more articles from thestack of articles 3 to be drawn into the rolling nip 28 formed between normal force applicator roller 27 and driven feed belt 5. Since normal force applicatorroller 27 is pressed against only a few of the bottom articles in the stack of articles 3, very little force is required to ensure feed of an article, even an article whose leading edge may not lie flat. Similarly, since normal force applicator roller 27 applies a force to only a few of the bottom articles in a stack of articles 3, the top of the stack of articles 3 is unencumbered allowingthe addition of more articles to the stack of articles 3 even while the feeder is 1 ~S~j~74 operating. The a~ticles in the stack of articles 3, which are moved into the rolling nip 28 formed between normal force applicator roller 27 and driven feed belt 5 by the movement of driven feed belt 5, are then brought into contact withfriction retard pad 47. The coefficient of friction between driven feed belt 5 5 and the bottom article of the stack of articles 3 is chosen to be higher than the coefficient of friction between friction retard pad 47 and the same article so that the article can be moved between the friction retard pad 47 and driven feedbelt 5 when driven feed belt 5 is operating. The friction retard pad 47 applies sufficient force to block the feed of the article next above the bottom article 10 causing the friction retard pad 47 to act as an article separator.
Other types of separators may also be used with the present normal force applicator concept. It has been found that the present normal force applicator will operate reliably feeding ordinary sheets of paper or envelopes with no adjustments being required. Also, typically only 100 to 150 grams of 15 force are required for a normal force applicator roller measuring about 1/4 inch in diameter and about 3/8 inch in length.
Although specific embodiments and components have been described, it will be understood by those skilled in the art that various changes in the form and details may be made therein without departing from the spirit and scope of 20 the invention. All such changes in form and detail should be considered as encompassed by the following claims.
Claims (4)
1. An apparatus for assisting bottom feeding an article from a stack of articles to a separator, which comprises:
an input tray for holding a stack of articles, said input tray having a slot formed therein;
a driven feed belt positioned to protrude through said slot in said input tray in feeding relationship to a stack of articles on said input tray;
a normal force applicator roller positioned in spaced relationship to said driven feed belt to form a rolling nip therewith, article guide means for guiding the bottom articles in the stack of articles to said nip formed by said normal force applicator roller and said driven feed belt;
means for urging said normal force applicator roller toward said driven feed belt, said means being of strength sufficient to allow more than one article to pass into said rolling nip under the influence of a moving driven feed belt;
separator means positioned in spaced relationship to said driven feed belt and positioned to receive articles passing through said rolling nip, said separator means being designed to allow the passage of only one article at a time therethrough.
an input tray for holding a stack of articles, said input tray having a slot formed therein;
a driven feed belt positioned to protrude through said slot in said input tray in feeding relationship to a stack of articles on said input tray;
a normal force applicator roller positioned in spaced relationship to said driven feed belt to form a rolling nip therewith, article guide means for guiding the bottom articles in the stack of articles to said nip formed by said normal force applicator roller and said driven feed belt;
means for urging said normal force applicator roller toward said driven feed belt, said means being of strength sufficient to allow more than one article to pass into said rolling nip under the influence of a moving driven feed belt;
separator means positioned in spaced relationship to said driven feed belt and positioned to receive articles passing through said rolling nip, said separator means being designed to allow the passage of only one article at a time therethrough.
2. The apparatus of Claim 1 wherein said guide means is positioned to direct articles against the periphery of said normal force applicator roller at a point below a centerline of said roller drawn parallel to the direction of feed of an article.
3. The apparatus of Claim 1 wherein said means for urging said normal force applicator roller toward said driven feed belt is a spring.
4. The apparatus of Claim 1 wherein said separator comprises a friction retard pad placed in spaced relationship to said driven feed belt, and means are provided to urge said friction retard pad toward said driven feed belt of strength sufficient to allow the passage of only one article at a time between said friction retard pad and said driven feed belt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16383480A | 1980-06-27 | 1980-06-27 | |
| US163,834 | 1980-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156274A true CA1156274A (en) | 1983-11-01 |
Family
ID=22591782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000376696A Expired CA1156274A (en) | 1980-06-27 | 1981-05-01 | Roller normal force applicator for bottom article feeder |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0043262B1 (en) |
| JP (1) | JPS5727843A (en) |
| CA (1) | CA1156274A (en) |
| DE (1) | DE3168460D1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8502572D0 (en) * | 1985-02-01 | 1985-03-06 | Ofrex Group Plc | Sheet feeding mechanism |
| JP2657918B2 (en) * | 1987-12-02 | 1997-09-30 | 株式会社タイトー | Card issuing device |
| GB0129095D0 (en) * | 2001-12-05 | 2002-01-23 | Pueschel Johannes | Sheet feeding apparatus |
| HUE028933T2 (en) * | 2011-11-16 | 2017-01-30 | Creasestream Llp | Sheet feeders |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3838851A (en) * | 1972-02-22 | 1974-10-01 | Addressograph Multigraph | Bottom sheet feeder |
| US3984659A (en) * | 1972-05-08 | 1976-10-05 | Ball Computer Products, Inc. | Apparatus for feeding sheet material from the bottom of a stack |
| US3970298A (en) * | 1975-06-05 | 1976-07-20 | Pitney-Bowes, Inc. | Mixed thickness sheet separator and feeder |
| US4014537A (en) * | 1975-11-28 | 1977-03-29 | Xerox Corporation | Air floatation bottom feeder |
| FI781640A (en) * | 1977-06-10 | 1978-12-11 | Joensas Inter Marketing | ARKSEPARERINGS- OCH MATNINGSANORDNING |
-
1981
- 1981-05-01 CA CA000376696A patent/CA1156274A/en not_active Expired
- 1981-06-22 JP JP9540681A patent/JPS5727843A/en active Pending
- 1981-06-26 EP EP19810302913 patent/EP0043262B1/en not_active Expired
- 1981-06-26 DE DE8181302913T patent/DE3168460D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5727843A (en) | 1982-02-15 |
| EP0043262A1 (en) | 1982-01-06 |
| EP0043262B1 (en) | 1985-01-23 |
| DE3168460D1 (en) | 1985-03-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |