GB2265361A - Device for controlling the lateral position of a web - Google Patents
Device for controlling the lateral position of a web Download PDFInfo
- Publication number
- GB2265361A GB2265361A GB9302979A GB9302979A GB2265361A GB 2265361 A GB2265361 A GB 2265361A GB 9302979 A GB9302979 A GB 9302979A GB 9302979 A GB9302979 A GB 9302979A GB 2265361 A GB2265361 A GB 2265361A
- Authority
- GB
- United Kingdom
- Prior art keywords
- web
- air
- traverses
- blowing
- dryer
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/032—Controlling transverse register of web
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Winding Of Webs (AREA)
- Advancing Webs (AREA)
- Drying Of Solid Materials (AREA)
Description
1 :iL., 2265361 DEVICE FOR CONTROLLING THE LATERAL POSITION OF A WEB Spe
ification: The invention relates to a device for controlling the lateral position of a web, especially as the web travels through a dryer of a web-fed rotary printing machine, the web being floatingly guided between two arrangements of air-blowing traverses disposed transversely to the web travel direction.
After the web, which is f ormed of paper, f or example, has been printed on both sides with a desired printed area or subject in the respective printing units of a web-fed rotary printing press, it travels through the dryer. The freshly printed web is guided through the dryer between airblowing traverses arranged above and below it. The stream of heated air blown against the web from both sides thereof, i.e. from above and below, on the one hand, causes it to float through the dryer between the arrangements of the air-blowing traverses and, on the other hand, causes the process of drying the printing ink on the paper to be accelerated by the heating of the air.
The time during which a web section dwells in the dryer must be of such length that the printing ink on the web is completely dry when it leaves the dryer, because otherwise the ink would smudge 1 - when the web comes into contact with the surface of chill rollers located downstream from the dryer in the web travel direction. Thus, the desire to drive web-fed rotary presses at higher speeds is directly tied or subject to the requirement that the length of the dryer be suitably increased.
An increase in length of the drying path, however, causes serious problems with respect to the stability of the web guidance in the dryer. Accurate register adjustment is essential for eliminating these problems. A misadjustment of mechanical parts of the dryer, for example, can be the cause of an inclined course of travel of the web in the dryer, i.e., the cause of a deviation of the web from its reference position. Web guidance has proven to be especially critical, if the web does not correspond to the maximum web format or size. Turbulent air flows occurring at the edges of the web exert forces which act upon the web and cause a lateral deviation or shifting of the web from its reference position. similar effects are produced when the solvent-polluted air is exhausted from the dryer, especially when the air circulation or recirculation motors of the dryer are switched on or stepped up.
U.S. Patent No. 3,826,416 describes a device for controlling the lateral edges of a continuous web. After the material web has moved floatingly through an installation, it is brought into contact with a controlling roller which is pivotable about an axis perpendicular to the plane in which the web travels. If the web is in an inclined position indicating a lateral displacement, the displacement is sensed by a detector and the controlling roller is pivoted causing an increased tensile stress to be exerted on one of the web edges. In accordance with this required correction of the web position, a deviation from the reference position is compensated for in this manner.
A disadvantage of this heretofore known device is that a lateral deviation of the web from its reference position can only be corrected after it has passed through the dryer. When the path over which a printed web is dried is especially long, a minute deviation from the reference position at the entrance to the dryer or even in the dryer can develop into a considerably large deviation at the exit of the dryer. The deviation can be so large that it cannot be compensated for any more by the controlling roller without tearing the web due to the high tensile strength which would necessarily be applied to one side or edge of the web.
In German Published Non-Prosecuted Patent Application (DE-OS) 26 44 618, a device is disclosed wherein the lateral guidance of the web does not take place by contact with a solid body at the dryer exit but rather, by a varying blowing air flow applied to the web on both sides of the center line thereof. An occurrence of greater rippling or undulation in the web on one side thereof causes an apparent shortening of this one side, and the web is pulled to the side where it has the greater rippling or undulations.
It proves to be disadvantageous, in the foregoing heretofore known device, that the force created by the blowing air and transferred to the web depends quadratically upon, i.e., depends upon the square of, the radius of the blowing air jet or nozzle. Thus, minute variations in the jet or nozzle opening can already lead to marked changes in the blowing air relationships on both sides of the web. Therefore, web guidance with the device disclosed in the aforementioned German publication is possible only within rough limits. It is even noted in this German publication itself that the disclosed device functions with sufficient accuracy only in connection with web guidance via a controlling roller located at the dryer exit.
It is, accordingly, an object of the invention of the instant application to provide a device for controlling the lateral position of a web, wherein the web is laterally guided free of any contact with any part of the device or any other equipment.
1 With the foregoing and other objects in view, there is provided, in accordance with the invention, a device for controlling a lateral position of a travelling web floatingly guided by two arrangements of air- blowing traverses disposed transversely to a travel direction of the web, comprising a sensor for detecting a detectable location on the web, a control device, means for transmitting from the sensor to the control device a signal corresponding to a deviation Ax of the web from a reference position thereof, means actuable by the control device for pivoting one of the arrangements of air-blowing traverses about a longitudinal axis thereof in response to the signal corresponding to the deviation from the transmitting means so as to exert a lateral force upon the web counteracting the deviation of the web from the reference position thereof.
In accordance with another feature of the invention, there are provided means for adjusting height and inclination of the lower arrangement of air-blowing traverses with respect to the upper arrangement of airblowing traverses, the means comprising an assembly of cables fastened to the lower arrangement of traverses, pulleys over which the cables are looped, and servomotors connected to respective free ends of the cables for tightening and loosening the cables so as to displace the lower arrangement of traverses.
In accordance with a further feature of the invention, an upper one of the arrangements of air-blowing traverses is rigidly fastened in position, and a lower one of the arrangements of has a longitudinal axis and is pivotable axis thereof. Control of lateral force the web is achieved by relatively posithe lower arrangement of air-blowing relationship, i.e., at an inclination to air-blowing traverses about the longitudinal components exerted upor tioning the upper and traverses in a skewed one another, In accordance with other features of the invention, the device includes means for adjusting height and inclination of the lower arrangement of air-blowing traverses with respect to the upper arrangement of airblowing traverses, the adjusting means either comprising an assembly or cables fastened to the lower arrangement of traverses, pulleys over which the cables are looped, and servomotors connected to the respective free ends of the cables for tightening and loosening the cables so as to displace the lower arrangement of traverses, or an assembly of threaded spindles fastened at one end to the lower arrangement of traverses, and servomotors connected to the other ends of the threaded spindles, respectively, for raising and lowering respective parts of the lower arrangement of air-blowing traverses.
In accordance with an additional f eature of the invention, the device includes longitudinal beams carrying the air-blowing traverses of the upper arrangement, and mechanical stoppers located at least at ends of the longitudinal beams. Assurance is thereby provided that the mutual spacing of both arrangements will not be less than a given minimum, so that the web does not come in contact with the air-blowing traverses, for example.
In accordance with an added f eature of the invention, the arrangements of traverses are located in a dryer of a web-f ed rotary printing press, and the sensor for detecting the detectable location on the web is located at an exit of the dryer in which the web is located.
In accordance with a specif ic feature of the invention, the sensor is a photoelectric sensor.
In accordance with yet another f eature of the invention, the arrangements of traverses are located in a dryer of a web-f ed rotary printing press, and including a first chill roller located downstream from the dryer, as reviewed in the travel direction of the web, the sensor for detecting the detectable location on the web being located at the first chill roller.
In accordance with yet a further feature of the invention, there is provided a device for maintaining in a reference position a laterally deviating web floatingly guided by two arrangements of air-blowing jets disposed transversely to a travel direction of the web, which includes sensing device disposed at a lateral distance from a reference position of the travelling web f or detecting a detectable location on the web having a deviation from the reference position thereof corresponding to the lateral distance, device for applying to the web having the deviation a f orce having a component acting in a direction opposite to the direction of the deviation, and control device having an input connected to the sensing device for receiving a signal from the sensing device corresponding to the deviation from the reference position, and an output connected to the f orce-applying device for actuating the force-applying device in response to the signal to apply the force to the web so as to restore the web to the reference position thereof.
In accordance with a concomitant f eature of the invention, the detectable location on the web is an edge of the web.
At either the location of the dryer exit or the chill roller a deviation of the web from its reference position, which is to be compensated for in the dryer in accordance with the invention, can be detected accurately.
Although the device according to the invention is intended especially for use in a dryer of a web-f ed rotary press as hereinafter described, it can be utilized quite generally wherever a contact-free web guidance and/or control over long stretches or travel distances are required.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a device for controlling the lateral position of a web, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specif ic embodiments when read in connection with the accompanying drawings, in which:
Fig. 1 is a diagrammatic top plan view of arrangements of air blowing traverses in accordance with the invention; -g- Fig. 2 is a cross-sectional view of Fig. 1 taken along the line II-II in the direction of the arrows; Fig. 3 is a very diagrammatic cross-sectional view of Fig. 1 taken along the line III-III in the direction of the arrows, showing the force component of the blowing air which shifts the web back to its initial travel position; Fig. 4a is a front, side and top perspective view of the device for controlling the lateral position of a web in accordance with the invention, wherein the air-blowing traverses are adjustable by cables and pulleys; and Fig. 4b is a view like that of Fig. 4a of another embodiment of the device according to the invention, wherein the air-blowing traverses are adjustable by threaded spindles.
Referring now to the drawing and, first, particularly to Fig. 1 thereof, there is shown therein, in a diagrammatic top plan view, upper and lower arrangements 3 and 4 of air-blowing traverses, such as headers with air bars 2. The air-blowing traverses of the arrangements 3 and 4 are disposed transversely to the travel direction, as indicated by the arrow y, of a web 1 and are offset with respect to one another in the travel direction y. The offset relationship of the air bars 2 represents a safety 1 measure, for preventing the web 1 from coming into contact with the airblowing traverses f or the air bars 2 of one of the two arrangements 3 and 4 of the traverses when there is an irregular supply of air through the air7blowing traverses. Additionally, the dwell time of a web section in the dryer is prolonged by the vertically sintsoidal or undulating travel of the web 1 through and between the arrangements 3 and 4 of the air-blowing traverses. The blowing air jets, headers and feeding lines for the blowing air to which the air bars 2 are connected and the housing of the dryer are generally of conventional construction and are not illustrated in the drawing.
The reference position of the web 1 between the arrangements 3 and 4 of air bars 2 is indicated in phantom in the drawing. Through interfering effects, for example, as a result of misadjustment of a mechanical part of the dryer or an irregular feeding of blowing air onto the web 1, a lateral displacement of the web 1 over a distance Ax may occur in the dryer. A conventional sensor 5 such as a photoelectric sensor for detecting a detectable location on the web, such as a lateral edge of the web 1, is located at each lateral side of the web 1 and detects the actual position of the web 1. The detectable location on the web may, of course, also be a suitable non-illustrated marker, such as a magnetic, printed or other marker conventionally detectable by a suitably disposed sensor.
Fig. 2 is a cross-sectional and diagrammatic view of Fig. 1 taken along the line II-II. The web 1 moves in a vertically undulating path substantially in the middle between an upper and a lower arrangement 3 and 4 of air-blowing traverses, and is laterally displaced a distance Ax. The web-edge sensor 5 detects the actual position of the web 1 and transmits the information as a value XA to a conventional adder 6 which calculates the lateral displacement of the web 1 from a predetermined reference value XR for an ideal position of the web 1 equidistant from both side frames of the machine through which the web travels, and the measured actual value XA. The value or amount Ax of the displacement is transmitted to a control device 7, such as a conventional microcomputer, which actuates servomotors 17, 18, 19 and 20 in accordance with the amount of the displacement. The servomotors 17 and 18, for example, are connected to the lefthand side of the lower arrangement 4 of the air- blowing traverses, as viewed in Fig. 2, and the servomotors 19 and 20 to the right-hand side thereof by means of the devices illustrated in Figs. 4a and 4b and adjust the lower arrangement 4 with respect to the upper arrangement 3 of the air-blowing traverses so that the deviation Ax of the material web 1 towards either the lefthand or the right-hand side of Fig. 2 from its reference position is suitably compensated for.
Fig. 3 shows how the inventive device f or controlling a web 1 during its travel through the dryer of a web-fed rotary printing machine operates. Conventional devices f or detection, data feed-back and control of the material web position in the dryer are not illustrated in detail in Fig. 3. The control device 7 shown in Fig. 2 transmits setting or adjusting signals to servomotors 17 and 18, on the one hand, and 19 and 20, on the other hand, (Fig. 4b) in accordance with a deviation Ax from a ref erence position shown in phantom in Fig. 1, or a corresponding non-illustrated deviation in the opposite direction which is detected by the respective web-edge sensor 5. The respective servomotors 17 to 20 then cause a skewadjustment of the lower arrangement 4 of the air-blowing traverses. By this skew-adjustment of the lower arrangement 4 of the air-blowing traverses with respect to the upper arrangement 3, in the case of the illustrated deviation Ax, a lateral f orce F is exerted on the web 1 towards the operator's side. This force is computed in a conventional manner by the control device 7 so that the lateral deviation Ax of the web 1 from its reference position is compensated thereby. A possible alternative to effecting the skew-adjustment of the lower arrangement 4 is to provide the upper arrangement 3 with movable air-blowing jets or nozzles which may be inclined in a direction opposite to the direction of deviation of the web and which may blow the air with increased force against the web so that a component of that force restores the web to its reference position.
Figs. 4a and 4b illustrate two further embodiments of the inventive device for controlling a web during its travel through the dryer of a web- fed rotary printing machine. In both embodiments of Figs. 4a, and 4b, the upper arrangement 3 of air-blowing traverses is rigidly fastened in the dryer while the lower arrangement 4 of air-blowing traverses can be adjusted with respect to the upper arrangement 3.
The embodiment of Fig. 4a has cables 13, 14, 15 and 16 f ixedly connected to the ends of beams 27 and 28 of the lower arrangement 4 of air-blowing traverses. The cables 13, 14, 15 and 16 extend through bore holes in the ends of beams 25 and 26 of the upper arrangements 3 of the air-blowing traverses and via pulleys 9, 10, 11 and 12 to servomotors which are not illustrated in Fig. 4a but which are like those described hereinafter with respect to the embodiment of Fig. 4b. In accordance with a respective adjustment command from the control device 7 (also not illustrated in Fig. 4a), the lower arrangement 4 of air-blowing traverses on the operator's or machine side is suitably lifted or lowered. The beams 25 to 28 may be provided with headers for supplying blowing air to the air bars 2.
A mechanical stopper 8 at both ends of the respective beams 25 and 26 ensures that the spacing between both of the arrangements 3 and 4 of the air blowing traverses, on the one hand, and the web 1, on the other hand, does not fall below a given minimum, so that the web 1 always can be guided through the dryer intermediate both arrangements 3 and 4 of the air-blowing traverses without contacting any part of the arrangements 3 and 4.
The lower arrangement 4 of the air-blowing traverses of the embodiment of Fig. 4b is connected to the upper rigidly fastened arrangement 3 by means of threaded spindles 21, 22, 23 and 24. The threaded spindles 21, 22, 23 and 24 are screwed into pivotably mounted nuts fitted into bore holes at the ends of the beams 25 and 26 of the upper arrangement 3 of air-blowing traverses, and the ends of the beams 27 and 28 of the lower arrangement 4 of the air-blowing traverses. In accordance with the adjustment commands from the control device 7, the servomotors 17 and 18, on the one hand, and 19 and 2 0, on the other hand, respectively cause the lower arrangement 4 to be set askew to the upper arrangement 3 of the air- blowing traverses at the machine side and the operator side respectively. This kind of connection of both arrangements 3 and 4 of air-blowing traverses permits a possible adjustment range to be provided by the play of the pivotably mounted nuts, thereby dispensing with any mechanical -is- stopper at the ends of the mounts 25 and 26 of the upper arrange- ment. 3 of the air-blowing traverses in the embodiment of Fig. 4b.
It will of course be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention.
p claims:
1. Device for controlling a lateral position of a travelling web f loatingly guided by two arrangements of air-blowing traverses disposed transversely to a travel direction of the web, comprising a sensor for detecting a detectable location on the web. a control device, means for transmitting from said sensor to said control device a signal corresponding to a deviation Ax of the web from a reference position thereof, means detectable by said control device for pivoting one of the arrangements of air-blowing traverses about a longitudinal axis thereof in response to said signal corresponding to said deviation from said transmitting means so as to exert a lateral force upon the web counteracting said deviation of the web from the reference position thereof.
2. Device according to claim 1, wherein an upper one of the arrangements of air-blowing traverses is rigidly fastened in position, and a lower one of the arrangements of air-blowing traverses has a longitudinal axis and is pivotable about said longitudinal axis thereof.
3. Device according to claim 2, including means for adjusting height and inclination of said lower arrangement of air-blowing traverses with respect to the upper arrangement of air-blowing traverses, said means comprising an assembly of cables fastened to said lower arrangement of traverses, pulleys over which said cables are looped, and servomotors connected to respective free ends of said cables for tightening and loosening said cables so as to displace said lower arrangement of traverses.
4. Device according to claim 3, including longitudinal beams carrying the air-blowing traverses of said upper arrangement, and mechanical stoppers located at least at ends of said longitudinal beams.
5. Device according to claim 2, including means for adjusting height and inclination of said lower arrangement of air-blowing traverses with respect to the upper arrangement of air-blowing traverses, said means comprising an assembly of threaded spindles fastened at one end to said lower arrangement of traverses, and servomotors connected to the other ends of said threaded spindles, respectively, for raising and lowering respective parts of said lower arrangement of air-blowing traverses.
6. Device according to claim 1, wherein the arrangements of traverses are located in a dryer of a web-fed rotary printing press, and wherein said sensor for detecting the detectable location on the web is located at an exit of the dryer in which the web is located.
1 7. Device according to claim 1, wherein the arrangements of traverses are located in a dryer of a web-fed rotary printing press, and including a first chill roller located downstream from said dryer, said sensor for detecting the detectable location on the web being located at said first chill roller.
8. Device according to claim electric sensor.
wherein said sensor is a photo- 9. Device for maintaining in a reference position a laterally deviating web floatingly guided by two arrangements of air-blowing jets disposed transversely to a travel direction of the web, comprising sensing means disposed at a lateral distance from a reference position of the travelling web for detecting a detectable location on the web having a deviation from the reference position thereof corresponding to said lateral distance, means for applying to the web having said deviation a force having a component acting in a direction opposite to the direction of said deviation, and control means having an input connected to said sensing means for receiving a signal from said sensing means corresponding to said deviation from said reference position, and an output connected to said force-applying means for actuating said force- applying means in response to said signal to apply said force to the web so as to restore the web to the reference position thereof.
109 Device according to claim 1, wherein said detectable location on the web is an edge of the web.
11. A device for controlling a lateral position of a travelling web floatingly guided by two arrangements of air-blowing traverses disposed transversely to a travel direction of a web, substantially as hereinbefore described with reference to the accompanying drawings.
12. A device for maintaining in a reference position a laterally deviating web floatingly guided by two arrangements of air-blowing jets disposed transversely to a travel direction of the web, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US85527092A | 1992-03-23 | 1992-03-23 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9302979D0 GB9302979D0 (en) | 1993-03-31 |
| GB2265361A true GB2265361A (en) | 1993-09-29 |
| GB2265361B GB2265361B (en) | 1995-08-09 |
Family
ID=25320809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9302979A Expired - Fee Related GB2265361B (en) | 1992-03-23 | 1993-02-15 | Device for controlling the lateral position of a web |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH0616296A (en) |
| CN (1) | CN1028628C (en) |
| DE (1) | DE4305088A1 (en) |
| FR (1) | FR2689490B1 (en) |
| GB (1) | GB2265361B (en) |
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| EP0733870A2 (en) * | 1995-03-21 | 1996-09-25 | W.R. Grace & Co.-Conn. | Non-contact flotation web guide/dryer |
| EP0783106A1 (en) * | 1996-01-05 | 1997-07-09 | Xerox Corporation | Motion tracking using applied thermal gradients |
| EP0810413A1 (en) * | 1996-05-31 | 1997-12-03 | Brückner Trockentechnik GmbH & Co. KG | Drying and/or fixing apparatus |
| WO1997047934A1 (en) * | 1996-06-14 | 1997-12-18 | Koenig & Bauer Ag | Suspension drier |
| EP3456669A4 (en) * | 2017-03-24 | 2020-04-01 | Chugai Ro Co., Ltd. | Conveying device for belt-shaped material capable of correcting meandering |
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| DE4328445B4 (en) * | 1993-08-24 | 2004-03-04 | Heidelberger Druckmaschinen Ag | Device for conveying sheets onto a stack |
| DE19833977A1 (en) * | 1998-07-28 | 2000-02-03 | Voith Sulzer Papiertech Patent | Method of controlling transverse position of moving material, esp. paper or cardboard, involves using path guide element(s) to contactlessly guide material on compressed gas cushion |
| EP1201429B1 (en) * | 2000-10-24 | 2012-06-27 | Goss Contiweb B.V. | Method and device for cooling a material web |
| CN103568359A (en) * | 2013-11-13 | 2014-02-12 | 立华彩印（昆山）有限公司 | Paper feed device of box pasting machine |
| CN107008961A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | It is a kind of to prevent the control method of circle shear steel-fastening |
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| JP2021535881A (en) * | 2018-10-29 | 2021-12-23 | ヒューレット−パッカード デベロップメント カンパニー エル.ピー.Hewlett‐Packard Development Company, L.P. | Web shift compensation |
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| CN110589563A (en) * | 2019-09-02 | 2019-12-20 | 红塔烟草(集团)有限责任公司 | Device for detecting left and right side offset of reel material paper tape |
| CN110817535B (en) * | 2019-11-26 | 2020-12-15 | 安徽骄阳软门有限责任公司 | Gauze conveyor with prevent that gauze from taking off line |
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-
1993
- 1993-02-01 CN CN 93100676 patent/CN1028628C/en not_active Expired - Fee Related
- 1993-02-04 FR FR9301219A patent/FR2689490B1/en not_active Expired - Fee Related
- 1993-02-15 GB GB9302979A patent/GB2265361B/en not_active Expired - Fee Related
- 1993-02-19 DE DE4305088A patent/DE4305088A1/en not_active Withdrawn
- 1993-03-23 JP JP6416393A patent/JPH0616296A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3826416A (en) * | 1969-12-17 | 1974-07-30 | Fuji Photo Film Co Ltd | Web edge position controlling device |
| DE2644618A1 (en) * | 1976-10-02 | 1978-04-06 | Lamicoater Ets | Equipment for handling flexible material band - has gas jets for holding material band in suspension |
| US4480777A (en) * | 1981-06-15 | 1984-11-06 | Daidotokushuko Kabushikikaisha | Apparatus for conveying strip material |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0733870A2 (en) * | 1995-03-21 | 1996-09-25 | W.R. Grace & Co.-Conn. | Non-contact flotation web guide/dryer |
| EP0733870A3 (en) * | 1995-03-21 | 1997-07-16 | Grace W R & Co | Non-contact flotation web guide/dryer |
| EP0783106A1 (en) * | 1996-01-05 | 1997-07-09 | Xerox Corporation | Motion tracking using applied thermal gradients |
| EP0810413A1 (en) * | 1996-05-31 | 1997-12-03 | Brückner Trockentechnik GmbH & Co. KG | Drying and/or fixing apparatus |
| WO1997047934A1 (en) * | 1996-06-14 | 1997-12-18 | Koenig & Bauer Ag | Suspension drier |
| US5921451A (en) * | 1996-06-14 | 1999-07-13 | Koenig & Bauer-Aktiengesellschaft | Dryer assembly for supporting and positioning a web |
| EP3456669A4 (en) * | 2017-03-24 | 2020-04-01 | Chugai Ro Co., Ltd. | Conveying device for belt-shaped material capable of correcting meandering |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1076666A (en) | 1993-09-29 |
| JPH0616296A (en) | 1994-01-25 |
| GB2265361B (en) | 1995-08-09 |
| CN1028628C (en) | 1995-05-31 |
| FR2689490B1 (en) | 1995-03-03 |
| FR2689490A1 (en) | 1993-10-08 |
| DE4305088A1 (en) | 1993-09-30 |
| GB9302979D0 (en) | 1993-03-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990215 |