EP0809574A1 - Puderbestäubungseinrichtung - Google Patents
PuderbestäubungseinrichtungInfo
- Publication number
- EP0809574A1 EP0809574A1 EP96937226A EP96937226A EP0809574A1 EP 0809574 A1 EP0809574 A1 EP 0809574A1 EP 96937226 A EP96937226 A EP 96937226A EP 96937226 A EP96937226 A EP 96937226A EP 0809574 A1 EP0809574 A1 EP 0809574A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzles
- powder
- powder dusting
- gripping
- printed products
- 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
-
- 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
- B41F23/06—Powdering devices, e.g. for preventing set-off
Definitions
- the invention relates to a powder dusting device for a printing press
- Powder dusting devices of this type are used to provide printed products in printing machines which come from the printing unit and have passed through a drying section with a powder layer which prevents subsequent sticking of the printed products.
- they are arranged in the vicinity of the transport plane of the printed products in such a way that their nozzles can apply a mixture of air (air) and powder to the printed products.
- the transport systems of printing machines are formed by parallel endless conveyor chains which are connected to one another by a large number of gripping devices.
- the gripping devices comprise a gripping mechanism which can hold the printed products on the edge and protrude beyond the transport plane of the printed products.
- the nozzles must be at a relatively large distance from the transport plane at which the gripping devices can pass.
- this large distance has the disadvantage that the powder-air mixture which is pushed out of the nozzles spreads in an uncontrolled manner in the printing press.
- the object of the present invention is to design a powder dusting device of the type mentioned at the outset in such a way that the powder-air mixture can be applied to the printed products in a more spatially concentrated manner
- a lifting device which can move the nozzles between two positions, namely
- a control device which detects the position of the gripping devices and which cooperates with the lifting device in such a way that it brings the nozzles into the first position as long as an gripping device is in the vicinity of the nozzles and the nozzles into brings the second position when the gripping device is at a sufficient distance from the nozzles.
- the nozzles of the powder dusting device are no longer fixed. Rather, they receive a mobility perpendicular to the transport plane of the printed products, in such a way that they can "dodge" approaching gripping devices, that is, in the relatively short period in which the gripping devices pass under the nozzles, maintain a correspondingly large distance from the transport plane
- the lifting device like the control device, can be implemented in very different ways.
- both the lifting and the control device are constructed mechanically and combined with one another. It is characterized in that the lifting device and the control device are combined in a cam mechanism which comprises:
- the relative position between the gripping devices on the transport system and the nozzles is detected mechanically; the lifting mechanism does not require any special drive and the control device does not require its own power supply.
- This exemplary embodiment is particularly robust and susceptible to faults.
- two parallel cam surfaces are provided which form a cam track in which the cam follower is received.
- the two parallel cam surfaces guide the cam follower in both possible directions of movement, so that the latter can perform its function without the aid of other components.
- the lifting device is mechanically separated from the control device.
- the latter can then also be easily carried out electrically / electronically.
- it can comprise a first sensor arranged on the transport plane, which, when a gripping device approaches the nozzles, emits a first signal to the lifting device, which causes the lifting device to bring the nozzle into the first position.
- the sensor can be any device that responds to the physical proximity of the gripping device, such as. B. all forms of proximity switches, light barriers, but also mechanical switches, the actuating member of which can be acted upon by the gripping devices moving past.
- control device comprises a second sensor arranged on the transport plane which, when a gripping device moves away, emits a second signal to the lifting device which causes the lifting device to bring the nozzle into the second position.
- control device contains a timing element which is triggered by the first signal of the first sensor and, after a certain period of time, emits a second signal which is fed to the lifting device and causes it to put the nozzles in the second position.
- this variant is likely to be less expensive than the above-mentioned control device working with two sensors.
- the time period defined by the timer between The occurrence of the first and the second signal is selected so that it is sufficient at the respective speed of the transport system to let the gripping device pass at the nozzles.
- one of the two following variants of combining the nozzles into a nozzle assembly can prove to be particularly advantageous:
- the first variant is characterized in that the nozzles are rigidly connected to a distributor pipe and form a movable unit with this, which is connected to the mixing channel via a flexible hose.
- This variant manages with a single flexible hose, which is favorable both in terms of the use of materials and in terms of assembly costs.
- a distributor pipe rigidly connected to the nozzle generally also means a somewhat larger moving mass.
- eme embodiment of the invention can be selected, in which the nozzles are connected to a movable unit via a light supporting rod and each nozzle is connected via a flexible hose to a fixed distributor pipe which is one of them ⁇ is connected to the mixing device.
- the distributor pipe is not moved; the cohesion of the nozzle assembly, which unites the various nozzles, is carried out via the support rod, which can be much lighter than a manifold. In this case, however, a connection must be made via a flexible hose between each nozzle and the distributor pipe.
- An embodiment of the invention is particularly preferred which has a sensor which detects the position of the nozzles and generates an output signal which operates the mixing device only as long as the nozzles are in the second position (close to the transport plane) are located.
- the pollination is thus interrupted as long as the nozzles for passing a gripping device are raised to the first position; in this way the disadvantages mentioned above, which are found in known powder dusting devices, are also avoided in these time periods.
- the lifting device can be controlled particularly easily if it adjusts the nozzles in a pivoting movement between the two positions.
- the lifting device has a single-arm or multi-arm lever which carries the nozzles at a first point and is driven by a cam surface at a second point.
- the cam surface serving to move the nozzles between the two positions is designed and driven in such a way that one revolution of the cam surface of the
- Figure 1 schematically the outlet area of a printing machine
- FIG. 2 likewise schematically, a powder dusting device provided in the printing machine from FIG. 1 in a first position of the nozzles;
- Figure 3 is a view corresponding to Figure 2, but in which the nozzles are in a second position;
- Figure 4 the view of a cam track carrying
- Figure 5 a schematic representation of a modified drive for adjusting the nozzles of a powder dusting device.
- FIG. 1 The outlet area of a printing press is shown in FIG. To the right of the area shown is the actual printing unit.
- the printed products are moved through the entire printing press with the aid of a conveyor system which comprises two endless conveyor chains 1.
- a conveyor system which comprises two endless conveyor chains 1.
- Conveyor chain 1 lies behind the drawing level; A corresponding endless conveyor chain 1 is arranged in front of the drawing plane of FIG. 1 and runs parallel to the conveyor chain 1 shown.
- the two conveyor chains 1 are interconnected by a plurality of gripping devices 2 connected, which extend perpendicular to the plane of Figure 1 and on each of which a gripping mechanism for gripping a printed product is attached.
- the construction of such gripping devices 2 is known per se.
- the gripping devices 2 are arranged along the conveyor chains 1 at regular intervals from one another and transport the printed products from the inlet area of the printing machine, not shown, through the printing unit, also not shown, and then in the direction of the arrow 3 on the powder dusting device 4, which is only schematically indicated in FIG over to a stack 5, on which they are dropped.
- the powder dusting device 4 is provided, with which a powder layer is applied to the printed products. This prevents the stacked printed products from sticking together in the stack 5.
- FIGS. 2 and 3 An exemplary embodiment of such a powder dusting device 4 is shown on a larger scale in FIGS. 2 and 3.
- a plurality of nozzles 6, which are fed via a common distributor pipe 7, are aligned with the transport plane of the printed products that are conveyed past by means of the conveyor chains 1.
- the distribution The pipe 7 is connected via a flexible hose 16 to a mixing device 8, in which the powder, generally a corn starch product, is mixed with carrier air and is thus conveyed to the nozzles 6.
- a sprocket 9 is rotatably mounted in the machine housing, which is not shown in more detail, by means of an axle stub 10 and engages in the transport chain 1, which is moved behind the plane of the drawing in the direction of arrow 3 in FIGS. 2 and 3.
- the circumference of the chain wheel 9 corresponds to the distance at which the gripping devices 2 are carried by the conveyor chains 1.
- a cam track 11 is formed in the sprocket 9 on the side facing the distributor pipe 7, said cam track 11 having cam surfaces Ila, Ilb running parallel to one another.
- the cam track 11 has the following shape:
- the cam track 11 follows an arc that is concentric with the center of rotation of the chain wheel 9 and has a relatively small radius.
- the angle region a is adjoined on both sides by angles ⁇ and ⁇ transition regions in which the cam track 11 changes from the smaller radius to a larger radius.
- the cam track 11 follows an arc that is also concentric with the center of rotation of the chain wheel 9, but has a larger radius.
- the distributor pipe 7 is provided with a pin 12, which serves as a cam follower and projects in the axial direction provided which engages in the cam track 11.
- the distributor pipe 7 and thus the nozzles 6 can be displaced in the vertical direction between two guides 13, which are indicated by dashed lines in the drawing.
- the arrangement is such that the vertical position of the nozzles 6 is determined by the cam track 11, and thus ultimately by the rotational position of the chain wheel 9.
- the distance between two successive gripping devices 2 on the transport chain 1 corresponds to the scope of the
- the sprocket 9 is mounted so that the cam track 11 is in the angular range ⁇ , in which it follows the circular arc of smaller diameter, in engagement with the cam follower 12 of the distributor pipe 7 when a gripping device 2 passes under the nozzles 6.
- the powder dusting device 4 described above works as follows:
- the cam follower 12 is located on the distributor pipe 7 in the area of the cam track 11 which has the larger radius. This means that the distributor pipe 7 with the nozzles 6 attached to it is lowered relatively far down between the guides 13. The openings of the nozzles 6 are at a relatively small distance from the printed products which are being dragged past and which move in the transport plane defined by the conveyor chains 1. This means that the powder-air mixture, which emerges from the nozzles 6, has only relatively few possibilities to escape laterally.
- the gripping device 2 moves under the nozzles 6, for which there is sufficient space due to the large distance between the nozzles 6 and the transport plane defined by the conveyor chains 1 Transition area of the cam track 11 in the chain wheel 9, which is assigned to the lagging angular area ⁇ .
- the cam follower 12 so that the distributor pipe 7 and the nozzles 6 fastened thereon, is again transferred into the area of the cam track 11 which has the larger radius.
- This transfer of the cam follower 12 goes hand in hand with a lowering of the distributor pipe 7, which is displaceable between the guides 13, and the nozzles 6 m, the position shown in FIG. 3
- the conditions are such that the nozzles 6 withdraw briefly from the transport plane of the printed products in order to allow a gripping device 2 to pass, and that they then immediately return to the position adjacent to the transport plane.
- a sensor 15 which detects the presence of the lowered distributor pipe 7 or the lowered nozzles 6.
- the exemplary embodiment of the sensor 15 shown in the drawing is a reflection light barrier.
- all types of proximity switches or a mechanical microswitch whose actuating element lies in the path of movement of the nozzles 6 or a component which moves with them are equally well suited.
- the sensor 15 sends a switch-on signal to the mixing device 8.
- the mixing device 8 requests the powder-air mixture through the flexible hose 16 to the distributor pipe 7, from which it emerges via the nozzles 6 m in the direction of the printed products. If, on the other hand, the sensor 15 detects, as shown in FIG. 2, that the nozzles 6 and the distributor pipe 7 are raised upwards for the passage of a gripper device 2, it sends a shutdown signal to the mixing device 8, so that no powder from the Nozzles 6 is blown out.
- the cam device which causes the nozzles 6 to be raised and lowered, is designed as a cam track 11 with two opposing cam surfaces Ila and Ilb.
- the cam follower 7 is thus both in
- the lifting and lowering movement is controlled electronically.
- the distributor pipe 7 with the nozzles 6 is fastened to a pneumatic cylinder or another lifting drive (eg a magnetic drive), which is able to move the distributor pipe 7 and nozzle 6 vertically back and forth between two positions.
- a gripping device 2 to the nozzles 6 is detected by a first sensor, e.g. B. a (reflection) light barrier, found. This first sensor then sends a first signal to the lifting device, which then moves the nozzles 6 and the distributor pipe 7 into the upper position.
- the gripping device 2 Once the gripping device 2 has passed the nozzles 6, it passes through a second sensor, which can be constructed similarly to the first sensor. This second sensor gives a second signal when it passes the gripping device 2, whereupon the latter returns the nozzles 6 and the distributor pipe 7 to the position adjacent to the transport plane of the printed products.
- the sensors which act on the lifting device can also be used to switch the mixing device 8 on and off.
- a complete nozzle assembly consisting of distributor pipe 7 and the nozzles 6, is moved back and forth in the vertical direction.
- a single flexible hose 16 is sufficient, which establishes the connection between the mixing device 8 and the distributor pipe 7.
- a flexible hose leads from each nozzle to the distributor pipe.
- the lifting device comprises a double-arm lever 17, on one arm 18 of which the nozzles 6 are arranged and the other arm 19 of which is driven by a cam surface 11a, 11b, for which purpose it engages with a drive pin 20 in the cam track 11.
- the lever 17 is mounted on a frame-fixed pin 21.
- the sprocket 9 rotates the cam track 11 in synchronism with the movement of the conveyor chains 1, and as a result, the nozzles receive a swinging movement from one position to the other.
- the cam track 11 is mounted on the chain wheel 9, the circumference of which corresponds to the distance between two successive gripping devices 2.
- the phase position of the chain wheel 9 is matched to the phase position of the gripping devices 2 during assembly, so that it is again ensured that the nozzles 6 are each lifted by a sufficient distance from the path traversed by the printed products during the passage of a gripping device 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Discharge By Other Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19546720 | 1995-12-14 | ||
DE19546720A DE19546720A1 (de) | 1995-12-14 | 1995-12-14 | Puderbestäubungseinrichtung |
PCT/EP1996/004635 WO1997021545A1 (de) | 1995-12-14 | 1996-10-25 | Puderbestäubungseinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0809574A1 true EP0809574A1 (de) | 1997-12-03 |
EP0809574B1 EP0809574B1 (de) | 1999-05-26 |
Family
ID=7780139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96937226A Expired - Lifetime EP0809574B1 (de) | 1995-12-14 | 1996-10-25 | Puderbestäubungseinrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US5823112A (de) |
EP (1) | EP0809574B1 (de) |
JP (1) | JPH11500376A (de) |
DE (2) | DE19546720A1 (de) |
WO (1) | WO1997021545A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19636658C2 (de) * | 1996-09-10 | 2000-12-14 | Roland Man Druckmasch | Vorrichtung zur Oberflächenbehandlung von bogenförmigen Bedruckstoffen |
JP2001239645A (ja) * | 2000-03-02 | 2001-09-04 | Komori Corp | 枚葉輪転印刷機のパウダー装置 |
US20050045055A1 (en) * | 2003-08-28 | 2005-03-03 | Daniel Gelbart | Security printing method |
DE102009041225A1 (de) | 2009-09-11 | 2011-03-24 | Heidelberger Druckmaschinen Ag | Druckmaschine mit einer Pudervorrichtung |
DE102011076067A1 (de) | 2011-05-18 | 2012-11-22 | manroland sheetfed GmbH | Verfahren zum Auslegen von Bogenmaterial in einer Bogenverarbeitungsmaschine und Auslegervorrichtung |
US9731498B2 (en) * | 2013-10-28 | 2017-08-15 | Hewlett-Packard Indigo B.V. | To apply a fluid to a substrate |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1555797A (en) * | 1924-09-12 | 1925-09-29 | Allen L Grammer | Spraying apparatus |
US4332198A (en) * | 1980-06-23 | 1982-06-01 | Schmoeger Duane A | Printing press with an air assist sheet delivery and powdering system |
DE3143089A1 (de) * | 1981-10-30 | 1983-05-26 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Vorrichtung zum trocknen von bedruckten bogen an offsetdruckmaschinen |
US4807528A (en) * | 1987-06-10 | 1989-02-28 | Airtech Company, Inc. | Offset prevention means for printing presses |
US5001980A (en) * | 1988-12-29 | 1991-03-26 | Komori Printing Machinery Co., Ltd. | Delivery apparatus for sheet-fed printing press |
JP2870660B2 (ja) * | 1990-03-06 | 1999-03-17 | 理想科学工業株式会社 | 孔版印刷装置 |
JP3025361B2 (ja) * | 1992-02-07 | 2000-03-27 | 理想科学工業株式会社 | 孔版印刷装置のブレード式スキージ装置 |
-
1995
- 1995-12-14 DE DE19546720A patent/DE19546720A1/de not_active Withdrawn
-
1996
- 1996-10-25 WO PCT/EP1996/004635 patent/WO1997021545A1/de active IP Right Grant
- 1996-10-25 US US08/860,765 patent/US5823112A/en not_active Expired - Fee Related
- 1996-10-25 DE DE59602001T patent/DE59602001D1/de not_active Expired - Fee Related
- 1996-10-25 JP JP9521641A patent/JPH11500376A/ja active Pending
- 1996-10-25 EP EP96937226A patent/EP0809574B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9721545A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19546720A1 (de) | 1997-06-19 |
WO1997021545A1 (de) | 1997-06-19 |
EP0809574B1 (de) | 1999-05-26 |
DE59602001D1 (de) | 1999-07-01 |
US5823112A (en) | 1998-10-20 |
JPH11500376A (ja) | 1999-01-12 |
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