CN109703188B - Device for drying sheets, sheet delivery device and printing machine - Google Patents
Device for drying sheets, sheet delivery device and printing machine Download PDFInfo
- Publication number
- CN109703188B CN109703188B CN201811251799.6A CN201811251799A CN109703188B CN 109703188 B CN109703188 B CN 109703188B CN 201811251799 A CN201811251799 A CN 201811251799A CN 109703188 B CN109703188 B CN 109703188B
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- CN
- China
- Prior art keywords
- sheet
- dryer
- blowing
- preparation
- air
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
- B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
- B65H29/041—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands and introducing into a pile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/044—Drying sheets, e.g. between two printing stations
- B41F23/0443—Drying sheets, e.g. between two printing stations after printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/044—Drying sheets, e.g. between two printing stations
- B41F23/045—Drying sheets, e.g. between two printing stations by radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/70—Article bending or stiffening arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/44—Moving, forwarding, guiding material
- B65H2301/443—Moving, forwarding, guiding material by acting on surface of handled material
- B65H2301/4433—Moving, forwarding, guiding material by acting on surface of handled material by means holding the material
- B65H2301/44331—Moving, forwarding, guiding material by acting on surface of handled material by means holding the material at particular portion of handled material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/44—Moving, forwarding, guiding material
- B65H2301/446—Assisting moving, forwarding or guiding of material
- B65H2301/4461—Assisting moving, forwarding or guiding of material by blowing air towards handled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/512—Changing form of handled material
- B65H2301/5121—Bending, buckling, curling, bringing a curvature
- B65H2301/51214—Bending, buckling, curling, bringing a curvature parallel to direction of displacement of handled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/517—Drying material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/24—Post -processing devices
- B65H2801/31—Devices located downstream of industrial printers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a device for drying sheets, comprising: a first gripper bridge (5a) for fastening the front edge (3a) of the sheet (3); a second gripper bridge (5b) for simultaneously fastening the rear edges (3c) of the sheets (3); a dryer (6) provided on one side (4a) of the sheet conveying path (4); and a blowing device (8,8a,8b) which is arranged on the other side (4b) of the transport path and which generates blowing air (9,9a,9b) in such a way that a section (3b) of the sheet located between the front edge and the rear edge is pushed towards the dryer.
Description
Technical Field
The invention relates to a device for drying sheets.
Background
The invention is in the field of drying printed sheets of printing material (e.g. provided with printing colours, varnishes or inks).
Document DE 4218421 a1 discloses a device for guiding sheets in a feeder of a printing press. The device comprises a circulating conveyor chain and a sheet gripper arranged thereon for the front edge of the sheet to be guided and a rear gripper for the rear edge thereof. The sheets are guided through a dryer, which discharges blowing air in the direction of the sheets. These sheets are to be guided reliably on a straight transport path and are held taut (draft) there.
Dryers are also known which generate electromagnetic radiation, in particular Infrared Radiation (IR), instead of blowing air.
In the prior art, the problem may arise that an uncontrolled change in the distance between the sheet to be dried and the dryer due to the sheet sagging can lead to an undesirably changing drying result (for example uneven curing of the uv ink) and thus to a reduction in the quality of the printed product. This problem may occur particularly in large and very large sheet sizes.
Disclosure of Invention
Against this background, the object of the invention is to provide an apparatus which is improved compared to the prior art and which makes it possible in particular to: the spacing of the sheet (or its surface) from the dryer is maintained substantially constant during drying.
The technical scheme of the invention is as follows:
this object is achieved by the device according to the invention.
Advantageous and further preferred developments of the invention result from the description and the drawing.
The invention relates to a device for drying sheets, comprising:
-a first gripper bridge for fastening a leading edge of a sheet;
-a second gripper bridge for simultaneously fastening the rear edges of the sheets;
a dryer disposed on one side of a conveying path of the sheet; and
a blowing device which is arranged on the other side of the transport path and which generates blowing air in such a way that a sheet section located between the leading edge and the trailing edge is pushed towards the dryer.
The invention advantageously enables: the spacing of the sheet (or its surface facing the dryer) from the dryer is kept substantially constant during drying, and as a result undisturbed drying results are achieved and correspondingly high quality printing results can be produced. The blowing air can advantageously tension the sheet and, for example, convert it from a concave (uncontrolled sagging) shape into a convex (controlled tensioned) shape.
The control of the blowing air can preferably be effected in dependence on operating parameters, wherein the following parameters can be taken into account: grammage of the sheet, conveying speed of the sheet, and/or Format of the sheet. In addition, it can be provided that the position of the blowing device with respect to the sheet and/or the gripper bridge is taken into account. Furthermore, the time of the blowing of air (Taktung) can be set. Such a beat may be a beat that is simply turned on/off in the presence/absence of a sheet. The intensity of the blowing air can also be varied, preferably over the length of the sheet. Finally, the intensity of the blowing air can be set and/or varied individually for each air source in the case of two air sources (for example air knives). Control devices can be provided for the measures listed here.
Instead of drying the sheets, the invention can also be applied to dusting (spraying of powder), moistening (spraying of water) or cutting (longitudinal cutting) of the sheets.
The improvement scheme of the invention is as follows:
a preferred development of the invention can be characterized in that the blowing device comprises an air knife. The air doctor may be a tube arranged transversely to the sheet transport direction, the tube having spaced apart air exit openings, the tube being attached to the blowing air supply device. Alternatively or in addition to the air scraper, the blowing device can be configured as a (one-dimensional) fan strip or as a (two-dimensional) fan zone (for example consisting of two or more transversely arranged fan rows), transverse to the sheet transport direction, wherein each individual fan of the fan strip or fan zone can be configured as a fan (for example an axial fan), in particular with an individually controllable electric drive.
A preferred development of the invention can be characterized in that the blowing device comprises at least two air knives. The directions of the respective outflowing air may be parallel. Preferably, the scrapers are slightly inclined pointing away from each other. Alternatively, a zone of blowing nozzles can also be employed.
A preferred development of the invention can be characterized in that the apparatus comprises a suction device.
A preferred development of the invention can be characterized in that the suction device is arranged on such a side of the transport path: a dryer is also provided on this side.
A preferred development of the invention can be characterized in that the suction device is arranged upstream and/or downstream of the dryer in the conveying direction.
A preferred development of the invention can be characterized in that the dryer is an LED dryer and/or an ultraviolet dryer.
A preferred development of the invention can be characterized in that the transport path extends in the region of the blowing device essentially along a straight section or essentially along a curved section or a circular section (Kreisabschnitt).
The features of the invention, the improvements of the invention and the embodiments of the invention are advantageous improvements of the invention in any combination with one another. The improvements of the invention can furthermore be provided with individual features or combinations of features disclosed in the above sections of the "technical field" and "background".
Drawings
The invention and its preferred modifications are further described below in accordance with preferred embodiments with reference to the accompanying drawings. Features that correspond to each other are provided with the same reference numerals in the figures. The figures show:
FIG. 1: an apparatus according to the prior art;
FIG. 2: an apparatus according to the prior art;
FIG. 3: preferred embodiments of the apparatus according to the invention; and
FIG. 4: preferred embodiments of the device according to the invention.
Detailed Description
Fig. 1 shows a printing press 1 or sheet delivery 2 for transporting sheets 3 of printing material on a sheet guide path or transport path 4. The collector is a double gripper sheet collector (Doppelgreifer-bogenausleeger). The transported sheets are, for example, made of paper, cardboard or film. The conveying path 4 is in the example shown a straight section 4 c.
The sheet start 3a (or the front edge of the sheet) is held (e.g., clamped) by a first (or front) gripper bridge 5 a. Accordingly, the sheet end 3c (or the rear edge of the sheet) is held (e.g., clamped) by the second (or rear) gripper bridge 5 b.
Fig. 1 illustrates the problem that the sheet central portion 3b may sag and the spacing a of the sheet (or its surface) from the dryer 6 may increase. The dryer is arranged on the first side 4a of the transport path. The dryer is preferably an LED dryer and preferably radiates in the ultraviolet range. The radiation 7 exits through the exit window 6a of the dryer. The spacing a may be defined as the spacing between the outer surface of the exit window and the surface of the sheet facing the window.
It can be seen that the spacing a changes in the case of a sheet sagging. Thereby, the drying result also changes. This is undesirable.
Fig. 2 shows a printing press 1 or a sheet feeder 2, which conveys a sheet 3 on a circular section 4d (generally a non-linear section or a curved section) of a conveying path 4. In this example, it can also be seen that the spacing a changes undesirably in the event of a sheet drop.
Fig. 3 shows a preferred embodiment of the device according to the invention, in which a sheet 3 is transported on a straight section 4c of the transport path 4. A blowing device 8 is provided according to the invention on a second (further or opposite) side 4b of the transport path 4. In the example shown, the blowing device comprises two air knives 8a and 8 b. These blowing devices 8 supply blowing air 9 (in particular a first air stream 9a and a second air stream 9b) to the underside of the sheet 3 (i.e. the side facing away from the dryer 6). The central sheet part 3b is pushed by blowing air toward the dryer 6 according to the invention. Thereby, the interval a becomes smaller (compared to fig. 1) and in particular substantially constant (i.e. without interval variations interfering with the drying process). The dried printed product thus has no appreciable quality reduction. This is advantageous. Instead of the air scrapers 8a and 8b shown (or in addition) a fan row 8 or a fan zone 8 can also be provided.
In fig. 3, one or more suction devices 10 can optionally be arranged on the side 4 a. The one or more suction devices 10 can support the displacement of the central sheet part 3b toward the dryer 6 by suction. For example, the suction device may be arranged before the dryer 6 (or its housing 6b) in the conveying direction 4. Alternatively, two suction devices may be provided in the housing before and after the dryer.
Also shown in fig. 3, a further (third) air doctor 8c can optionally be provided. The air doctor 8c is preferably arranged on the second side 4b of the transport path 4 in the transport direction 4 before the dryer housing 6b of the dryer 6, and it is advantageously possible to achieve: for the dryer 6, the sheet 3 is already loaded with blowing air 9 and the sheet 3 is thereby tensioned and/or smoothed.
Fig. 4 shows a further preferred embodiment of the device according to the invention, in which the sheet 3 is transported on a circular segment 4d of the transport path 4. In this example, a blowing device 8 (preferably with two air knives 8a and 8b) is provided according to the invention on the (further or opposite) side 4b of the transport path 4. Also in this example one or more suction devices 10 can optionally be provided. Instead of the air scrapers 8a and 8b shown, (or in addition) a fan row 8 or a fan zone 8 can also be provided.
As can be seen from fig. 4, in the case of a sheet 3 transported on a circle segment 4d, the drying according to the invention with the aid of blowing air is particularly advantageous, since the sheet 3 lies essentially completely against the circle segment and the distance a can be kept almost ideally constant.
The blowing device 8 according to fig. 3 or 4 can also comprise only one single air knife. The illustrated example with two air knives 8a and 8b is however preferred in particular if these knives are slightly (pointing away from each other) inclined as illustrated.
List of reference numerals:
1 printing machine
2 (double-grabber type) sheet material collector
3 sheet/sheet made of printing material
3a sheet start/sheet leading edge
3b sheet center/sheet overhang/sheet section between front and rear edge
3c end of sheet/trailing edge of sheet
4 sheet guide rail/conveying path/conveying direction
4a first side of the conveying path
4b second (other) side of the conveying path
4c straight line segment
4d circular segment/curved segment
5a first (front) gripper bridge
5b second (rear) gripper bridge
6 dryer
6a exit window
6b dryer housing
7 radiation
8 blowing device or fan row or fan zone
8a first air knife
8b second air knife
8c third air knife
9 blowing air
9a first air flow
9b second air flow
10 suction device
A sheet to dryer spacing
Claims (10)
1. An apparatus for drying a sheet, comprising:
-a first gripper bridge (5a) for fastening a leading edge (3a) of a sheet (3);
-a second gripper bridge (5b) for simultaneously fastening the rear edge (3c) of the sheet (3);
-a dryer (6) arranged on one side (4a) of the transport path (4) of the sheets; and
-blowing means (8,8a,8b) which are arranged on the other side (4b) of the transport path and which generate blowing air (9,9a,9b) for pushing a sheet section (3b) lying between the leading edge and the trailing edge towards the dryer,
wherein the blowing device (8,8a,8b) interacts with the first gripper bridge (5a) and with the second gripper bridge (5b) in such a way that the region between the front edge (3a) of the sheet (3) which is fastened by the first gripper bridge (5a) and the rear edge (3c) which is fastened by the second gripper bridge (5b) is configured in a controlled tensioned shape when the sheet (3) is guided through the dryer (6), so that the spacing (A) of the sheet surface of the region from the dryer (6) is kept constant during drying.
2. The apparatus as set forth in claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
the blowing device (8,8a,8b) comprises an air scraper (8a,8b), a fan bank (8) or a fan zone (8).
3. The apparatus as set forth in claim 2, wherein,
it is characterized in that the preparation method is characterized in that,
the blowing device (8,8a,8b) comprises at least two air knives (8a,8 b).
4. The apparatus according to one of claims 1 to 3,
it is characterized in that the preparation method is characterized in that,
the apparatus comprises a suction device (10).
5. The apparatus as set forth in claim 4, wherein,
it is characterized in that the preparation method is characterized in that,
the suction device (10) is arranged on such a side (4a) of the transport path (4): a dryer (6) is also arranged on this side.
6. The apparatus as set forth in claim 5, wherein,
it is characterized in that the preparation method is characterized in that,
the suction device (10) is arranged in the conveying direction (4) before and/or after the dryer (6).
7. The apparatus according to one of claims 1 to 3,
it is characterized in that the preparation method is characterized in that,
the dryer (6) is an LED dryer and/or an ultraviolet dryer.
8. The apparatus according to one of claims 1 to 3,
it is characterized in that the preparation method is characterized in that,
the transport path (4) extends in the region of the blowing devices (8,8a,8b) essentially along a straight section (4c) or essentially along a curved section (4d) or a circular section (4 d).
9. A sheet feeder (2) having at least one apparatus according to one of claims 1 to 8.
10. Printing press (1) with at least one device according to one of claims 1 to 8.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017219022.1 | 2017-10-25 | ||
| DE102017219022 | 2017-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109703188A CN109703188A (en) | 2019-05-03 |
| CN109703188B true CN109703188B (en) | 2022-06-03 |
Family
ID=65996456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811251799.6A Active CN109703188B (en) | 2017-10-25 | 2018-10-25 | Device for drying sheets, sheet delivery device and printing machine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109703188B (en) |
| DE (1) | DE102018211588A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4218421A1 (en) | 1992-06-04 | 1993-12-09 | Heidelberger Druckmasch Ag | Sheet guide in the delivery of a printing press |
| EP0701958B1 (en) * | 1994-09-02 | 1998-07-15 | Heidelberger Druckmaschinen Aktiengesellschaft | Device for guiding a sheet |
| DE19607397A1 (en) * | 1996-02-28 | 1997-09-04 | Heidelberger Druckmasch Ag | Device and method for guiding sheet material in a printing press, in particular in a sheet-fed offset printing press |
| GB2468703A (en) * | 2009-03-19 | 2010-09-22 | Gew | Ink curing apparatus with water cooled heat exchanging means |
| EP2463100B1 (en) * | 2010-12-03 | 2013-07-17 | Heidelberger Druckmaschinen AG | Machine for processing brackets, in particular bracket pressure machine |
| CN204322723U (en) * | 2014-12-12 | 2015-05-13 | 中华商务联合印刷(广东)有限公司 | A kind of UV machine cooling system |
| CN205112652U (en) * | 2015-11-09 | 2016-03-30 | 中山市金海包装科技有限公司 | Radium -shine paper lithography apparatus of cryodrying formula |
-
2018
- 2018-07-12 DE DE102018211588.5A patent/DE102018211588A1/en active Pending
- 2018-10-25 CN CN201811251799.6A patent/CN109703188B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018211588A1 (en) | 2019-04-25 |
| CN109703188A (en) | 2019-05-03 |
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