GB1596474A - Sheet feeding apparatus for a folding machine - Google Patents
Sheet feeding apparatus for a folding machine Download PDFInfo
- Publication number
- GB1596474A GB1596474A GB20719/78A GB2071978A GB1596474A GB 1596474 A GB1596474 A GB 1596474A GB 20719/78 A GB20719/78 A GB 20719/78A GB 2071978 A GB2071978 A GB 2071978A GB 1596474 A GB1596474 A GB 1596474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet
- diverter
- double
- transport path
- sensor
- 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
- 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
- B65H7/06—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 responsive to presence of faulty articles or incorrect separation or feed
- B65H7/12—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 responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
- B65H7/125—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 responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation sensing the double feed or separation without contacting the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H45/00—Folding thin material
- B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
- B65H45/14—Buckling folders
- B65H45/142—Pocket-type folders
Landscapes
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Controlling Sheets Or Webs (AREA)
Description
(54) SHEET FEEDING APPARATUS FOR A
FOLDING MACHINE
(71) We, MASCHINENBAU OPPEN WEILER G.m.b.H., a German limited liability company, of Grabenstrasse, D-7155 Oppenweiler, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to a sheet feeding apparatus for a folding machine, the apparatus including a conveyor which delivers sheets to the folding machine and a double sheet barrier controlled by a double sheet sensor arranged adjacent the transport path of the conveyor.
In known sheet feeding apparatus, sheet transport is interrupted when a double sheet sensor, which is located at the beginning of the conveyor detects a double sheet, in order that the double sheet can be manually removed from the conveyor. Double sheets thus cause a substantial decrease in the performance of the sheet feeding apparatus because of the interruption in operation necessary to remove the same. This is the case especially for sheet feeding apparatus with a conveyor comprising bands and rails between which the delivered sheets lie, be- cause with such a conveyor a double sheet must be removed from between the bands and rails. Moreover, the double sheet thus becomes unusable which is a further disadvantage of such known apparatus.
An object of the invention is to provide a sheet feeding apparatus for a folding machine having a performance capability which is decreased as little as possible by double sheets. According to the invention there is provided a sheet feeding apparatus having a conveyor for supplying sheets along a transport path, a double sheet barrier. and a double sheet sensor arranged adjacent the transport path for detecting double sheets and controlling the double sheet barrier wherein i) the double sheet barrier includes a sheet diverter, arranged downstream of the sensor for movement between a first position permitting onward movement of the sheets and a second position diverting from the path a double sheet detected by the sensor, and drive means responsive to the sensor for shifting the sheet diverter from the first to the second position; ii) the distance between the sensor and the diverter along the transport path is such that, when a double sheet is detected by the sensor, the drive means is operative to move the sheet diverter into the second position before the sheet preceding the double sheet has passed the diverter and to return the diverter to the first position before the double sheet has passed the diverter; and iii) the sheet diverter comprises a guide body rotatable about an axis which is transvese to the path, the guide body having a curved guide surface facing the sensor, which guide surface forms a continuation of the transport path when the sheet diverter is in the second position.
When a double sheet is detected by the sensor, sheet transport need not be stopped for the double sheet to be removed manually, as is necessary with the known apparatus, but rather the double sheet is automatically rejected by the sheet diverter. Double sheets are thus easily rejected without damage.
Especially advantageous is the fact that the sheet diverter is controlled in such a manner that it is moved into the second position when a double sheet is detected, before the preceding sheet has completely passed the diverter, and that the diverter returns to this position before the double sheet has left it. It is thus provided in a simple manner, that the sheet diverter is located in the second position, ready to rejet a double sheet, when the double sheet reaches the sheet diverter, and that the sheet diverter is shifted to its original or first position when the single sheet following the double sheet reaches it, even at high sheet transport speeds and even when there is a very small distance between successive sheets. The delivery speed of the conveyor and the distance between two successive sheets therefore, need not be adapted to the time necessary for activating the drive means to move the sheet diverter from the first position to the second, as would be necessary if the sheet diverter had to be moved during the time between the passing of the trailing edge to one sheet and the front edge of the next sheet.
Preferably, the sheet diverter is arranged at the end of the transport path formed by the conveyor. so that no additional means are necessary to avoid damage to the sheet preceding a double sheet by the sheet diverter. This preceding sheet will have already been gripped by for example the first pair of rollers of a downstream folding machine when the sheet diverter is moved into the second position, thus deflecting the sheet portion still running over the sheet diverter out of the transport path. This deflection, however, cannot detrimentally influence orderly entry of the sheet into the folding machine.
The sheet diverter may move towards the sheet preceding the double sheet from either above or below, and may be brought into the second position causing some deflection of the preceding sheet. Which of these two possibilities is more advantageous depends upon spatial conditions as well as upon the direction in which a deflection of the sheet preceding the double sheet will be preferred.
A double sheet will be guided by the diverter in the second position along a curved and preferably concave path, which makes rejection possible using a relatively short path. In order that a rejected double sheet need not be immediately removed from the transport path, the rejection advantageously takes place downwardly. Generally, a rigid guide having a surface extending downwardly along a curved path from the concave guide surface is sufficient to collect the rejected double sheets beneath the conveyor into a stack.
If the guide body is to be moved from below towards the sheet preceding the double sheet, preferably it has a second guide surface forming an acute angled wedge with the curved guide surface, which second guide surface, in the first position of the sheet diverter, forms the final portion of the transport path.
In order to keep the cost for the drive of the sheet diverter low and still make possible a rapid shifting of the sheet diverter, in a preferred embodiment, the drive has an electromagnet which holds the sheet diverter in the second position when activated and a spring which is biased to hold the sheet diverter in the first position.
In the following the invention is described in greater detail with the aid of two exemplary embodiments shown in the drawings, wherein:
Figure 1 is a schematic side view of a first exemplary embodiment of the invention in the position of the sheet diverter for transporting the sheets to the folding machine;
Figure 2 is a schematic side view of the first exemplary embodiment in a position of a sheet diverter for rejecting a double sheet; and
Figure 3 is a schematic side view of a second exemplary embodiment of the invention.
A sheet feeding apparatus for feeding sheets to a folding machine I includes, as shown in Figure 1, a conveyor belt 2, which, in the exemplary embodiment, is shown as an endless belt conveyor. The belt 2 conveys the sheets to be folded successively along a straight transport path to the entrance of the folding machine 1, which entrance comprises a roller pair 3. The delivery speed of the conveyor belt 2 is variable and can. for example, be set at 150 sheets per minute. The spacing between successive sheets is also variable. It is set as low as possible, such as at 1 cm, to achieve the highest possible performance of the sheet diverter. At this setting, the leading edge of a sheet passes a certain point 4 thousandths of a second (0.004 sec.) after the trailing edge of the previous sheet has passed the same point.
The sheets are delivered to the conveyor belt 2 by means of a suction wheel 4, which removes the uppermost sheet from a stack 5.
At the end of the transport area formed by the delivery belts 12 of the conveyor belt 2, that is, the end of the conveyor belt 2 where the folding machine 1 is located, there is located a sheet diverter 6, which comprises a guide body 7, an electromagnet 8 and a return spring 9. The guide body 7 can be rotated about an axis 10, which lies parallel to the axes of the roller pair 3 and the axis of the diverter roller 11 at the end of the delivery area of the conveyor belt 2 and beneath the transport path which extends to the entrance of the folding machine 1. The final portion of the transport path, which extends to a point between the rollers of the roller pair 3, is formed by a guide surface 13 of the guide body 7. In the exemplary embodiment, guide surface 13 is flat and the axis 10 lies beneath its end section confronting the roller pair 3. A curved guide surface 14, which is convex when viewed from the axis 10, extends to the edge of the guide surface 13 confronting the conveyor belt 2 and forms an acute angled wedge with the guide surface 13. The guide surfaces 13 and 14 are made of sheet metal and are connected with each other by side walls 15, also made of sheet metal, so that the guide body 7 has a small mass.
As Figure 1 shows, the electromagnet 8 and the return spring 9 engage a respective side wall 15 at a distance from the axis 10.
The other end of the spring 9 is connected to a holding element, which is rigidly affixed beneath the guide body 7, while the housing of the electromagnet 8 is rigidly affixed above the guide body 7. Of course, other arrangements of the electromagnet 8 and the return spring 9 are possible, and the electromagnet 8 could, for example, also drive the guide body 7 by means of a pivotable lever.
In addition, the return spring could be eliminated if the electromagnet were arranged to move the guide body 7 in both pivotable directions about axis 10.
The electromagnet 8 is controlled by means of a double sheet sensor 16 arranged above and below the transport path of the conveyor belt 2 formed by the belts 12 and placed some distance upstream of the guide body 7 of the sheet diverter 6. This double sheet sensor is able to detect, for example, by capacitive means, whether the sheet passing it is a double sheet or a single sheet. If the double sheet sensor 16 detects a double sheet, it activates the electromagnet 8, whereby the guide body 7 is moved upwardly against the force of the return spring 9, that is, counterclockwise as viewed in Figure 1, into a second position, where the edge formed by the two guide surfaces 13 and 14 lies somewhat above the transport path leading to the roller pair 3. When the guide body 7 is in this position, the front edge of a sheet approaching the guide body contacts the curved guide surface 14 and is thereby diverted or deflected downwardly. This downward deflection is completed by a rigid guide plate 17, which is curved in the same direction as the guide surface 14 and is adjacent thereto.
A sheet which strikes the curved guide surface 14 is, therefore, rejected downwardly and deposited below the conveyor belt 2.
In the first pbsition of the guide body 7 shown in Figure 1, the edge formed by the guide surfaces 13 and 14 lies somewhat below the path along which the sheets delivered from the belts 12 approach the guide body 7. In this position of the guide body, the sheets come into contact with the flat guide surface 13 and are transported into the nip of the roller pair 3.
The distance of the double sheet sensor 16 from the guide body 7 is chosen in such a manner that when a double sheet is detected, the guide body 7 is rotated into the second position shown in Figure 2, after the preceding sheet has already been grasped by the roller pair 3, but before this preceding sheet has fully passed the guide body 7. The sheet grasped by the roller pair 3 is thus deflected somewhat upwardly by the edge formed by the two guide surfaces 13 and 14, as Figure 2 shows, but this deflection does not disturb the orderly drawing of the grasped sheet into the folding machine 1 because the roller pair 3 prevents such sheet from shifting.
Rotation of the guide body 7 into the second position, as necessary for the rejection of the double sheet, before the preceding sheet has passed the guide body 7, assures that the subsequent double sheet will be rejected, even when the delivery speed is high and the distance between the successive sheets is very small.
The time during which the electromagnet 8 is activated is set by means of a control device (not shown) having a known circuitry, for example, an RC circuit, in such a manner that the guide body 7 returns into the first position shown in Figure 1, before the rejected double sheet has fully passed the guide body 7, so that the succeeding sheet comes into contact with the guide surface 13 so long as it is not also a double sheet. If two double sheets are transported in succession, the guide body 7 is held in or returned to the second position before the first double sheet passes the sheet diverter.
The roller pair 20, which in the exemplary embodiment is arranged between the diverter roller 11 and the guide body 7, and an associated entry plate 19 improve the guiding of the sheet during the approach toward the sheet diverter and during the time the sheet passes the sheet diverter.
The second exemplary embodiment shown in Figure 3 is basically distinguished from the previously described exemplary embodiment only in that the guide body 107 is arranged above the transport path of the sheets to the entrance of the folding machine.
Guide body 107 is rotatable about an axis parallel to the axes of the diverter roller 111 of the conveyor belt 102 and the roller pair 103. In the first position, where the sheet diverter 106 allows the sheets to enter between the rollers of the roller pair 103, the guide body 107, which can be rotated by means of an electromagnet 108, is rotatted upwardly into the position shown in Figure 3 by solid lines so that it does not influence the transport of the sheets from the conveyor belt 102 into the entrance of the folding machine.
If the guide body 107, however, is rotated downwardly, i.e., clockwise as seen in Figure 3, into the position indicated by broken lines, then the curved guide surface 114 extends into the transport path of the sheet and diverts it downwardly. A rigid diverting surface 117 guides the sheet downwardly where it enters, in the exemplary embodi ment. between a diverting roller 120 and a compressing roller 121. The upper periphery of the diverting roller 120, which roller is arranged next to the diverting roller 111 for the belts 112 of the conveyor belt 102, lies in the transport path of the sheets coming from the conveyor belt 102, whereby a rigid entry plate 119 insures that the sheets contact the diverting roller 120.
A rigid guide surface 122, which bridges the space between the sheet diverter 106 and the roller pair 103, is formed in such a manner as to allow the necessary downward deflection of the sheet preceding a double sheet by the guide body 107, in order that the latter, as in the first exemplary embodiment, can be rotated into its second position before the sheet preceding the double sheet has passed the guide body. In the exemplary embodiment, a space or opening is therefore provided between the guide surface 122 and the diverting roller 120 into which the guide body 107 can be shifted. In addition, the guide surface 122 is inclined toward the transport path leading to the roller pair 103.
The remaining details of the second exemplary embodiment and the actuation thereof are apparent by reference to the explanation of the first exemplary embodiment hereinabove.
WHAT WE CLAIM IS: I. A sheet feeding apparatus having a conveyor for supplying sheets along a transport path, a double sheet barrier, and a double sheet sensor arranged adjacent the transport path for detecting double sheets and controlling the double sheet barrier.
wherein i) the double sheet barrier includes a sheet diverter, arranged downstream of the sensor for movement between a first position permitting onward movement of the sheets and a second position diverting from the path a double sheet detected by the sensor, and drive means responsive to the sensor for shifting the sheet diverter from the first to the second position; ii) the distance between the sensor and the diverter along the transport path is such that, when a double sheet is detected by the sensor, the drive means is operative to move the sheet diverter into the second position before the sheet preceding the double sheet has passed the diverter and to return the diverter to the first position before the double sheet has passed the diverter means; and iii) the sheet diverter comprises a guide body rotatable about an axis which is transverse to the path, the guide body having a curved guide surface facing the sensor, which guide surface forms a continuation of the transport path when the sheet diverter is in the second position.
2. Apparatus according to claim 1, wherein the sheet diverter in the second position presents a concave curved surface to a double sheet.
3. Apparatus according to claim 1 or claim 2, wherein the sheet diverter is downstream of the transport path formed by the conveyor.
4. Apparatus according to any preceding claim, including a rigid guide arranged adjacent the curved guide surface, the rigid guide having a surface extending downwardly in a curved path.
5. Apparatus according to any preceding claim, wherein the guide body has a further guide surface forming an acute angled wedge with the curved guide surface, the further guide surface forming a final portion of the transport path when the sheet diverter is in the first position.
6. Apparatus according to any preceding claim, wherein the drive means includes electromagnetic means, which when activated, moves and holds the sheet diverter in the second position, and spring means biased for holding the sheet diverter in the first position.
7. A sheet feeding apparatus constructed and arranged substantially as herein described and shown in the drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
- **WARNING** start of CLMS field may overlap end of DESC **.can be rotated into its second position before the sheet preceding the double sheet has passed the guide body. In the exemplary embodiment, a space or opening is therefore provided between the guide surface 122 and the diverting roller 120 into which the guide body 107 can be shifted. In addition, the guide surface 122 is inclined toward the transport path leading to the roller pair 103.The remaining details of the second exemplary embodiment and the actuation thereof are apparent by reference to the explanation of the first exemplary embodiment hereinabove.WHAT WE CLAIM IS: I. A sheet feeding apparatus having a conveyor for supplying sheets along a transport path, a double sheet barrier, and a double sheet sensor arranged adjacent the transport path for detecting double sheets and controlling the double sheet barrier.wherein i) the double sheet barrier includes a sheet diverter, arranged downstream of the sensor for movement between a first position permitting onward movement of the sheets and a second position diverting from the path a double sheet detected by the sensor, and drive means responsive to the sensor for shifting the sheet diverter from the first to the second position; ii) the distance between the sensor and the diverter along the transport path is such that, when a double sheet is detected by the sensor, the drive means is operative to move the sheet diverter into the second position before the sheet preceding the double sheet has passed the diverter and to return the diverter to the first position before the double sheet has passed the diverter means; and iii) the sheet diverter comprises a guide body rotatable about an axis which is transverse to the path, the guide body having a curved guide surface facing the sensor, which guide surface forms a continuation of the transport path when the sheet diverter is in the second position.
- 2. Apparatus according to claim 1, wherein the sheet diverter in the second position presents a concave curved surface to a double sheet.
- 3. Apparatus according to claim 1 or claim 2, wherein the sheet diverter is downstream of the transport path formed by the conveyor.
- 4. Apparatus according to any preceding claim, including a rigid guide arranged adjacent the curved guide surface, the rigid guide having a surface extending downwardly in a curved path.
- 5. Apparatus according to any preceding claim, wherein the guide body has a further guide surface forming an acute angled wedge with the curved guide surface, the further guide surface forming a final portion of the transport path when the sheet diverter is in the first position.
- 6. Apparatus according to any preceding claim, wherein the drive means includes electromagnetic means, which when activated, moves and holds the sheet diverter in the second position, and spring means biased for holding the sheet diverter in the first position.
- 7. A sheet feeding apparatus constructed and arranged substantially as herein described and shown in the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772724387 DE2724387A1 (en) | 1977-05-28 | 1977-05-28 | SHEET FEEDER FOR FOLDING MACHINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1596474A true GB1596474A (en) | 1981-08-26 |
Family
ID=6010233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20719/78A Expired GB1596474A (en) | 1977-05-28 | 1978-05-19 | Sheet feeding apparatus for a folding machine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS53147367A (en) |
| DE (1) | DE2724387A1 (en) |
| GB (1) | GB1596474A (en) |
| IT (1) | IT1103315B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58184436U (en) * | 1982-05-29 | 1983-12-08 | 株式会社濱田印刷機製造所 | Paper ejection device in the paper feed section of a vertical printing press |
| US4431322A (en) * | 1982-09-20 | 1984-02-14 | Ncr Canada Ltd - Ncr Canada Ltee | Multiple path recording means |
| DE9004480U1 (en) * | 1990-04-19 | 1990-07-05 | Maschinenbau Oppenweiler Binder GmbH & Co, 7155 Oppenweiler | Sheet separator |
| US5217220A (en) * | 1991-08-19 | 1993-06-08 | Carlson Herbert L | Diverter for a printing press |
| US5673910A (en) * | 1994-12-13 | 1997-10-07 | Heidelberg Finishing Systems, Inc. | Apparatus and method for use in feeding sheet material assemblages |
| US5660385A (en) * | 1995-12-11 | 1997-08-26 | Eastman Kodak Company | Apparatus for diverting a photocopying medium in photocopies |
| DE10328803B4 (en) * | 2002-07-15 | 2017-04-27 | Heidelberger Druckmaschinen Ag | Device for the uninterrupted supply of pieces to be processed to a processing machine, in particular supply of sheets to a printing machine |
| DE102006012330C5 (en) | 2006-03-17 | 2023-04-06 | manroland sheetfed GmbH | Sheet-fed printing machine with post-processing unit |
-
1977
- 1977-05-28 DE DE19772724387 patent/DE2724387A1/en not_active Withdrawn
-
1978
- 1978-05-19 GB GB20719/78A patent/GB1596474A/en not_active Expired
- 1978-05-24 JP JP6211678A patent/JPS53147367A/en active Pending
- 1978-05-26 IT IT12629/78A patent/IT1103315B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT7812629A0 (en) | 1978-05-26 |
| IT1103315B (en) | 1985-10-14 |
| DE2724387A1 (en) | 1978-12-07 |
| JPS53147367A (en) | 1978-12-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |