JP2001162767A - Switchable sheet-carrying equipment provided for printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sheet-carrying equipment which carries sheets without offset, in particular, and improves the adaptability to the running of the sheets. SOLUTION: A flow passage 15 is formed of a lower part which is fixed to a frame, an upper part which is borne rotatably by a rotary joint, for instance, and provided with an opening part and has curving elasticity and a driving device which is provided for rotating an intermediate part covering the flow passage 15 hermetically and having elasticity and the upper part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchable sheet transport device provided in a printing press according to the preamble of the main claim.

[0002]

2. Description of the Related Art A sheet transporting device of this kind is disclosed in German Patent No. 4
It is known from the publication of 3 44 039. The sheet transport device is provided on a sheet transport cylinder, and the sheet transport device is selectively supplied with intake air or exhaust air. The sheet transport device is provided below the sheet transport cylinder and comprises an air receiver having an opening in the upper piece, the air receiver reaching below the contact point of the impression cylinder / sheet transport cylinder. , And rotatably provided. Depending on the type of operation (front or duplex printing), an air receiver to which air is supplied is provided near the circumference of the sheet transport cylinder (front printing), and in the case of a duplex printing operation, exhaust is supplied. The air receiver is pivoted away from the sheet transport cylinder.

The disadvantages of the above case are that the entire air receiver must be turned and that the curvature of the air receiver, which is predetermined by the sheet transport cylinder, remains unchanged. If the curvature of the air receiver is constant, there is a lack of consideration for the different properties of the printing material during the running of the sheet in terms of the type of operation and / or the grammaturity or the flexural rigidity.

[0004] A further sheet transporter is the German 43 43 0
It is known from the '40 patent. The sheet transport described in this document is adaptable to different curvatures in the longitudinal direction of the sheet travel, is movable in the longitudinal direction of the sheet travel, and the position of the sheet transport is It is pivotable. This type of sheet transport device is operated only by exhaust air, and has an upper portion having an outlet for exhaust air, and a lower portion having an upper portion and a lower portion connected to each other to form a hollow space. The upper and lower parts are in this case made of an elastic material, the elasticity of the lower part being much greater than the elasticity of the upper part.
The upper part is bendable, the lower part is extendable, and an airbag is formed when exhaust is supplied to the hollow space. When such a sheet transport device is provided in the return device, the return device is formed to be switchable according to the operation method. In this case, in the printing position, the sheet transport device is adapted to the corresponding sheet path, in the duplex printing position the sheet transport device is opened, and in the extended position of the sheet transport device, the two fixed positions. The space between the guide members is filled.

[0005] A disadvantage of the device described above is that the entire air receiver must be turned when changing the bend.

[0006] A further sheet transport device is known from DE 44 34 778, in particular for return devices.
In this device, a sheet transport device is fixed in a horizontal position below the return device, and when the sheet of the return device is raised, the sheet transport device is supported by a rotating joint fixed to a gantry and is rotated by a working cylinder. This is possible, so that the distance between the return device and the sheet transport device can be adjusted.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to avoid the disadvantages mentioned above, in particular to make it possible to transport a sheet without set-off and to take into account the flexural rigidity of the sheet material. It is another object of the present invention to provide a sheet transport device of the type described above, in which the adaptability to the running of the sheet during the reverse printing operation is improved.

[0008]

SUMMARY OF THE INVENTION This object is achieved according to the invention by the features of the design described in the main claim. Further developments are described in the dependent claims.

A first advantage is that the switchable sheet transport device can be used universally for sheet transport cylinders with a return device. This is done in consideration of the bending stiffness of the sheet material during front printing or duplex printing.
An ideal adaptation to various curved or straight sheet runs is realized. The principle of sheet transport supported by pneumatic pressure is maintained here. It is also advantageous that the switching of the sheet transport device can be performed manually or can be suitably automated.

In the case of automatic switching, the drive is connected to the machine control, and the sheet transport device is adapted to flow in the bending section or to the sheet according to the type of operation or the bending stiffness of the respective sheet material. Adjusted for different distances to the sheet transport cylinder, the sheet material is transported without set-off.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on embodiments.

According to FIG. 1, the sheet-fed rotary printing press mainly comprises a paper feed device 4, a number of printing devices 1, a varnishing device 2, and a delivery device 5. Each printing device 1 and varnishing device 2 has an impression cylinder 6, and the printing device 1 and varnishing device 2 are connected to each other by a transfer cylinder 14. Each printing device 1 has a transfer cylinder 8, a plate cylinder and an inking / dampening device. The varnishing device 2 has a plate cylinder 9 provided with a metering mechanism 10. Each transfer cylinder 8, plate cylinder 9, and impression cylinder 6 is provided with a cleaning device 7, respectively. The paper feed cylinder and the transfer cylinder 14 are provided with a sheet conveying device 11 to which air pressure is supplied.

It is also possible to provide a return device 12 instead of the transfer cylinder 14 between the two printing devices 1 or two impression cylinders 6 of the printing press, which can be operated selectively for front printing and duplex printing. The impression cylinder 6, the transfer cylinder 14, and the return device 12 are sheet transport cylinders formed to be twice as large as the transfer cylinder. The sheet-feeding turning device 12 is preferably designed as a double-size turning cylinder which operates according to the principle of turning by the trailing edge.

Such a return device 12 includes an adjustable sheet transport device 13, 1 which is preferably switchable from an exhaust operation to an intake operation and vice versa below the sheet travel path.
5, 24, which are provided over the entire width of the sheet transport path. An impression cylinder 6 provided in front of the return cylinder in the transport direction of the sheet material;
A flow passage 13 is provided below this, which is provided horizontally, has an upper part arranged in the impression cylinder 6 with an opening for ventilation, and has a suitably adjustable exhaust gas. It is connected to an air source which can be switched from operation to intake operation, for example a number of switchable ventilation systems.

Continuing as a sheet transport device switchable in transport direction 3 is a flow path 15 provided in return device 12. The flow passage 15 has a lower part 16 fixed to the gantry, below which is provided an adjustable air source 17 which can be operated for exhaust or intake. The flow passage 15 is furthermore formed with a curved elasticity and has an upper part 18 with a ventilation opening. The upper part 18 is preferably made of a steel piece or plastics or fibrous material having a bending elasticity. Provided between the lower part 16 and the upper part 18 is a suitably resilient intermediate member, for example a telescopic bellows, which seals the flow passage 15 (lower part 16 and upper part 18) in a sealed manner. Wrapping. Other configurations for the telescopic bellows are possible. For example, a resilient material, such as a foil or elastomeric material, that is hermetic and adapts to a pivoting movement that changes the position of the upper portion 18 can be used.

The upper part 18 is rotatably supported on at least one rotary joint 21 provided on the lower part 16 with respect to the sheet running path, and further has at least one connection point 22. A driving device 19 fixed to one stand, for example, a working cylinder capable of supplying air pressure is rotatably supported. Connection points 22 are preferably provided on both sides of the upper part 18 and connected to the driving device 19, respectively. In the preferred configuration, the top 1
8 has an ink / varnish repellent coating or a polished, smooth surface, for example, corresponding to the sheet travel path.

The side mount is provided with a guide edge 25 for supporting the curved flow of the upper portion 18. This guide edge 25 is connected to the drive 19 and is suitably adjusted so that a different curvature of the upper part 18 or a different distance of the upper part 18 with respect to the sheet travel path is realized. In response to the stiffness of the sheet, the upper portion 18 is pivotable from an equidistant position to a spaced position in its curving flow. in this case,
The upper part 18 is preferably connected to a gearing for the upper part 18 to rotate without contact (with respect to the adjacent sheet transport cylinders 6, 12, 14) in the guide path 23. In a preferred embodiment, the upper part 18 is guided in the guide path 23 by means of gearing technology. On the side of the upper part 18 there are provided, for example, rollers which move in engagement with the curvature of the groove.

In this embodiment, the flow passage 15 is provided in the return device 12 when the sheet is lowered. In this case, the rotary joint 21 is preferably provided in the lowest point area below the sheet transport cylinder (return device 12).

The return device 12 is provided with a flow passage 24 to which an air source 17 is connected, which can be suitably switched when the sheet is raised (exhaust / intake operation), and an opening for ventilation at the top. The flow channel 24 is provided behind the flow channel 15 in the transport direction and is journalled by at least one rotary joint, at which point the return device 1
It is connected to at least one drive for realizing a pivoting movement which takes place towards or away from the return device.

The method of operation of the switchable sheet transport device is as follows. The control of the switchable sheet transport device is preferably effected via machine control. During the "front printing" operation, the drive device 19 is extended. At this time, upper 1
8 is pivoted about the rotary joint 21 and is preset with respect to the return device 12 by a suitably adjustable guide edge 25 (with the rotary joint 21, the approximately impression cylinder 6 and the positive contact t of the return device 12). During) the flow of the bend. The upper part 18 can be fixed at a position equidistant or far away from the sheet transport path. A suitably resilient intermediate part 20 which can be repositioned is extended and the flow passage 15 is supplied with intake air. This intake air acts on the sheet material through an opening provided in the upper part 18 and draws the sheet material in the direction of the upper part 18. Depending on the deflection stiffness of the sheet material, the distance that the curved top 18 has with respect to the return device 12 is adjusted via a drive 19.

In a "double-sided printing" operation, the upper part 18 with a preferably resilient intermediate part 20 whose position can be changed, the guide path 23 in a substantially horizontal position, preferably in alignment with the flow passage 13, the drive 19 Is moved as before. Exhaust gas is supplied to the flow passage 15 through an opening provided in the upper portion 18, and the sheet material is conveyed without floating in the air by the exhaust gas.

The upper sides of the flow passages 15 and 24 are provided so as to be aligned with the sheet traveling path in the flow of the curved portion during the front printing operation. Flow path 1 during duplex printing operation
The upper sides of the sheets 3 and 15 are preferably arranged so as to be aligned in a horizontal position, and the upper sides of the flow passages 24 are curved corresponding to the flow of the sheet and continue to be aligned in the transport direction 3.

In a preferred embodiment, the upper part 18 of the flow path 15 is determined by a position equidistant from the sheet travel path and in particular by the lowest point of the sheet travel path in the corresponding sheet transport cylinder. In a region formed by the horizontal plane, the driving device 19 is capable of rotating and fixing at a selectable position. The upper portion 18 of the flow passage 15 is rotatable below the horizontal position in the previous flow passage 13 provided in the front, for example, so that it turns over to the transition portion between the two flow passages 13 and 15 during the reverse operation. There is no fear.

The switchable sheet transport device is not limited to the above-described embodiment, but rather, the lower portion 16, the intermediate portion 20,
A flow path 15 consisting of an upper part 18 is provided in any sheet transport cylinder, for example, the plate cylinder 6, the turning device 12 or the transfer cylinder 14.

In a further embodiment, the flow passage 15 consisting of the lower part 16, the intermediate part 20 and the upper part 18 is provided in a diverting gear of a circulating chain mechanism or in a take-off cylinder also provided in the delivery device.

In such a case, the flow path 15 is provided when the sheet transport of the sheet transport cylinders 6, 12, 14 or the diverting gear of the circulating chain mechanism descends. As an alternative, the flow channel 15 is provided when the sheet transport of the sheet transport cylinders 6, 12, 14 or the turning gear of the circulating chain mechanism is raised.

In this case, the rotary joint 21 is preferably provided substantially at the center below the sheet transport cylinder 6 or 12 or 14.

In addition to forming the sheet transport device for the return device 12 as described above, the sheet transport device is arranged on the impression cylinder 6 or the transfer cylinder 12 as the sheet transport cylinder. You can also. In the flow path 15, a similar further flow path 2 having an opening on the upper side corresponding to the sheet travel path is provided when the sheet transport cylinders 6, 12, 14 raise the sheet.
4 is provided rearward in the transport direction 3. The flow path 24 is rotatable with respect to the sheet travel path (similar to the flow path 15) using a drive and a rotary joint.

As a further alternative according to the invention, a first flow path 15 is provided when the sheet transport cylinders 6, 12, 14 are lowered, and a second flow path 15 of identical construction is provided for the sheet transport. The right and left sides can be reversed when the sheet of the cylinder is raised.

In a further embodiment, the upper part 1 of the flow passage 15
The side facing the sheet running path 8 is operatively connected to the coolant mechanism. The coolant mechanism is preferably formed as channels for guiding the coolant, which are provided on the upper part 18 on the side facing the sheet running path. Such a configuration is advantageous, for example, when the sheet transport cylinders 6, 12, 14 are operatively connected to a drying mechanism.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a sheet-fed rotary printing press having a sheet transport device.

FIG. 2 is an enlarged configuration diagram of a main part of a switchable sheet transport device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 printing device 2 varnishing device 3 transport device 4 paper feed device 5 feed device 6 impression cylinder 7 cleaning device 8 transfer cylinder 9 plate cylinder 10 dispensing mechanism 11 sheet transport device 12 return device 13 flow path 14 transfer cylinder 15 flow Passage 16 Fixed lower part 17 Air source 18 Upper part 19 Drive device 20 Elastic intermediate part 21 Rotating joint 22 Connection point 23 Guide path 24 Flow path 25 Guide edge t Positive contact

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Peter Wulf Germany D-63128 Dietzenbach Theodor-Hois-Ring 24 (72) Inventor Udo Tririch Germany D-63073 Offenbach Vin Gerdstrasse 5

Claims (17)

[Claims] 1. A switchable sheet transporting device for a printing press, said sheet transporting device having a flow passage through which exhaust or suction air can be supplied, the upper side of said flow passage being a sheet running. A sheet transport device provided below a path and provided with an opening for ventilation, wherein a lower portion (16) in which the flow passage (15) is fixed to a gantry.
The lower part is provided with an air source (17), and the flow passage (15) has a curved elasticity and has an upper part (18) formed with an opening for ventilation. An intermediate part (20) is provided between the upper part (18) and the lower part (15), the intermediate part (20) being variable in position, the intermediate part hermetically enclosing the flow passage (15), and the upper part (18) At least the rotary joint (2) provided at the lower portion (16)
1) a connection point provided at at least one drive unit (19), which is rotatably supported with respect to the sheet running path and is fixedly supported on a gantry; Switchable sheet transport device. 2. The switchable sheet conveying device according to claim 1, wherein the upper portion is made of a billet or a plastic or fiber material having a bending elasticity. 3. The switchable sheet transport device according to claim 1, wherein the position-changeable intermediate portion is made of an elastic material. 4. A flow path (13) provided with an opening above the flow path (15) and provided with an air source (17) is provided forward in the transport direction. The switchable sheet transport device according to claim 1, wherein the transport device is a switchable sheet transport device. 5. The sheet conveying cylinder (6, 12, 14), wherein the flow passage (15) formed from a lower part (16), an intermediate part (20) and an upper part (18) is provided in the sheet transport cylinder (6, 12, 14). 2. Switchable sheet transport device according to claim 1, characterized in that it is a switchable sheet transport device. 6. The flow passage (15) formed by a lower part (16), an intermediate part (20), and an upper part (18) is provided on a diverting gear of a circulating chain mechanism provided on a delivery device. The switchable sheet transport device according to claim 1, wherein: 7. The air source (17) is adjustable,
2. Switchable sheet transport device according to claim 1, characterized in that it is switchable from an exhaust supply to an intake supply and vice versa. 8. The switchable sheet transport device according to claim 1, wherein the upper portion has a coating repelling ink or varnish corresponding to the sheet travel path. 9. At least the flow path (15) is provided at the time of sheet descending of a sheet transport cylinder (6, 12, 14) or a turning gear of a circulating chain mechanism. Item 7. A switchable sheet conveying device according to item 1, 5 or 6. 10. At least the flow path (15) is provided when the sheet of a sheet transport cylinder (6, 12, 14) or a turning gear of a circulating chain mechanism is raised. Item 7. A switchable sheet conveying device according to item 1, 5 or 6. 11. An air supply (17) having an opening on the upper side, provided at the time of sheet lifting of a sheet transport cylinder (6, 12, 14), with respect to said flow path (15). 6. The switchable sheet conveying device according to claim 5, wherein the arranged flow passage is provided rearward in the conveying direction. 12. The switchable sheet transport according to claim 11, wherein the flow passage is rotatable with respect to the sheet travel path by means of a drive and a rotary joint. apparatus. 13. The upper part (1) of the flow passage (15).
8. The switchable sheet transport device according to claim 1, wherein the side facing the sheet traveling path of 8) is operatively connected to a coolant mechanism. 7. 14. The switchable sheet transport according to claim 13, wherein a passage for guiding a coolant is provided on a side of the upper part (18) facing the sheet travel path. apparatus. 15. A guide path (2) passing through said upper part (18).
2. Switchable sheet conveying device according to claim 1, wherein the upper part (18) is connected to a gearing for non-contact rotation in 3). 16. The guide path (2) wherein the upper part (18) is a guide path (2).
16. The switchable sheet conveying device according to claim 15, wherein in (3) the gearing technology is guided in a limited manner. 17. A method according to claim 17, wherein the upper portion is equidistant from the sheet travel path and a position below a horizontal plane determined by a lowest point of the sheet travel path. 2. The switchable sheet transport device according to claim 1, wherein the region is rotatable and positionable by a drive.