JP2000108305A - Sheet guiding apparatus for single-side printed/double- side printed sheet in press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet guiding apparatus for guiding a sheet which has a simple structure and guarantees sure sheet guiding in various operation patterns in a sheet-fed printing press. SOLUTION: A rotatable sheet smoothing/guiding device 2 has the first room 21 provided with a suction slot 4 and communicated with a sheet smoothing gap and this room can be solved by making it connect with an air action system 5. In addition, the sheet smoothing/guiding device 2 has the second room 20 and this room is communicated with a guiding face with an air ventilation hole 6 and has an opening part 19 in the axial direction. This opening part 19 can be functionally connected with movable casing parts 18 and 18' of a sheet guiding apparatus 13 with a flow path and an air ventilation hole 6 on its guiding face and as the result, air feeding from the flow path to the room 20 is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet guiding device for single-sided or double-sided printed sheets in a printing press. is there.

[0002]

2. Description of the Related Art A sheet guide device of this kind is disclosed in German Patent No. 22.
5 411 discloses a sheet guide device in which a sheet leveling device and a guide device for smoothing the sheet are connected to each other as one structural part. It is mounted on a printing press frame such that it can rotate about an axis parallel to the paper path. The sheet leveling device and the guide device are located in opposite vertical positions of the structural part, and each time the structural part is rotated by 180 ° into a working range (working area) in the sheet travel path. Be moved. The guide member (guide device) can be connected to an air supply device, and blown air is supplied from an outlet hole,
As a result, the sheets are conveyed to the delivery pile without contact by the action of the blowing air (in the case of sheets printed on both sides). In the case of single-sided printing, the sheet leveling device is pivoted into the working range (working area) in the sheet running path and removes the sheet-like curved bow of the sheet. In this case, the sheet leveling device protrudes beyond the adjacent guide plate for sucking the sheet.

[0003] Known devices are expensive to manufacture. I mean,
This is because the sheet-leveling device and the guide member must be moved by a suitable transmission mechanism when switching from single-sided printing to double-sided printing. A further disadvantage is that the sheet leveling device projecting above the guide surface damages the underside of the sheet. The risk of set-off is additionally increased in the region of the protruding sheet leveling device or in the transition region of the guide member / guide plate, since the transport of the sheets takes place only by the guide plate. In the case of single-sided printing, air is sucked from the sheet-sheet leveling device, and in the case of double-sided printing, the guide member is exclusively supplied with blown air by a switchable air supply device.

[0004] According to DE 34 11 029, a further sheet-guiding device for guiding single- or double-sided printed sheet material is known. The sheet guide device is formed by flow channels arranged in a modular manner, the flow channels having holes in the guide surface as air nozzles. The upper surfaces of the flow passages each constitute a conveying plane as a guide surface, and the flow passages have on their rear surface a plurality of switchable fans for blowing air into or sucking air from each flow passage. have.

[0005]

SUMMARY OF THE INVENTION The object of the invention is to solve the above-mentioned disadvantages, while at the same time featuring a particularly simple structure, and to ensure a reliable guidance of the sheets in each mode of operation. It is an object of the invention to provide a sheet guide device of the type described.

[0006]

According to the present invention, the above-mentioned object is achieved by an arrangement having the features of claim 1. Further configurations are as described in the dependent claims.

A first advantage of the present invention is that the sheet guide device can be switched between single-sided printing and double-sided printing modes of operation with little switching expense. That is, the sheet guiding device is optionally a sheet leveling device for single-sided printing and a sheet for guiding the sheet without contact for double-sided printing. It can be operated as a guide device. For this purpose, a sheet-leveling / guiding device is provided which is supported in a predetermined position with respect to the printing press frame and which is rotatable about an axis extending transversely at right angles to the sheet transport direction. It is provided in the working area. The sheet leveling / guide device is preferably associated with at least one adjacent stationary sheet guide device having a flow path. Advantageously, in the front-back position in the sheet transport direction in the delivery of the sheet-fed printing press,
A pneumatically actuatable flow channel with air flow openings is provided as a stationary sheet guide device. As a result, the sheet is pneumatically supported and reliably guided in all modes of operation. For switching to each operation mode, an action cylinder, a rotary joint, a connecting member,
It just needs Expensive transmissions are not required to control the pivoting movement of the sheet leveling device and the guide member.

The sheet leveling / guiding device according to the invention has a small gap distance in the working area for the pneumatically loadable flow path adjacent to the stationary sheet guiding device. It is advantageous to avoid it. In this way, possible damage to the sheet or set-off of the sheet can be prevented. The kinematic effect on the sheet is avoided by the substantially flat clearance of the sheet leveling / guiding device with a small gap between adjacent sheet guiding devices.

[0009] In the operation mode of double-sided printing,
The sheet leveling / guide device, in particular the sheet guide device, in the sheet guide device can be connected to an adjacent stationary sheet guide device with a pneumatically loadable flow passage. Advantageously, the blowing air or the suction air is made available. With this connection, an additional or switchable air supply is no longer required.

Finally, there is the advantage that the sheet guiding by the sheet guiding device is carried out in a consistently pneumatic manner. As a result, it is possible to realize a reliable sheet guide that can be suitably adapted to each operation mode (operation mode for single-sided printing and operation mode for double-sided printing).

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a sheet delivery having a sheet guiding device. FIG. 2 is a diagram showing a sheet leveling / guide apparatus having a sheet leveling function in a position for single-sided printing. FIG. 3 shows the sheet leveling / guide device of FIG. 2 in a position for double-sided printing or single-sided printing, having a sheet guiding function instead of a sheet leveling function.

The delivery of the sheet-fed rotary printing press is arranged behind the sheet-guiding cylinder 15 of the printing or varnishing device, viewed in the sheet-conveying direction 9. Delivery is mainly
It comprises a delivery drum 16 (or chain wheel shaft) and an endless circulating transport system 14, which is pivotally mounted for feeding the sheets coming from a sheet guide cylinder 15 to the delivery pile 12. A system 10 is provided. In this case, the sheet 11
It is guided in front of the fixedly arranged sheet guide device 13 and of the sheet guide device 3 of variable shape, is braked at the sheet braking device 1 and is lowered onto the delivery pile 12 towards the leading edge stopper. It is.

The stationary sheet guide device 13 is constituted by a modularly arranged, pneumatically loadable flow passage, as described, for example, in DE 34 11 029. The flow passages can be selectively switched, and blow-off or suction air is available. For this purpose, the sheet guide device 13 has an air flow hole 6 and has in each case one guide surface for the sheet 11. In the working area of the sheet guide,
A sheet leveling / guide device 2 is rotatably supported in a transverse direction perpendicular to the transport direction 9 by a support at a predetermined position with respect to the frame. The sheet leveling / guide device 2 has a plurality of functions. That is, it functions as a sheet leveling device for flattening a single-sided printed (including coated) sheet, and a sheet printed on a double-sided printed (including coated) sheet. This is a function as a sheet guide device for guiding so as not to touch, and these functions can be selected. For this purpose, the sheet leveling / guiding device 2 is preferably arranged in the delivery such that it just abuts between two modularly arranged stationary sheet guiding devices 13 in the delivery. When performing the above-mentioned functions in the action area between the sheet guide devices 13, the sheet guide devices 13 are arranged so as to be flush with an adjacent guide surface.

Furthermore, the sheet leveling / guide device 2 and at least one and / or a plurality of adjacent stationary sheet guide devices 13 allow the relative position of their guide surfaces to be determined in the sheet transport direction 9. They are offset from each other. In the sheet transport direction 9, in this case the structural part always provided on the upstream side, ie the guide surface of the stationary sheet guide device 13, is connected to the structural part provided on the downstream side, for example the sheet leveling / Slightly less than the guide surface of the guide device 2 in the range of the gap (the transition range between the sheet leveling / guide device 2, the variable-shaped sheet guide device 3, and the stationary sheet guide device 13). They are staggered so that they are higher (in this case, the concept of a guide surface also includes the upper edge of the sheet-leveling device). That is, on the downstream side when viewed from the structural part provided on the upstream side, the structural part on the downstream side and the structural part on the further downstream side of the structural part are lowered stepwise over at least the maximum shape width.

In this configuration, the amount of additional air is increased at each of these steps, and the air enhances the effect of the air cushion supporting the sheet between the sheet lower surface and the guide surface. This additional air creates a vortex circulating in the area of each step. The spiral axis of this vortex is perpendicular to the sheet transport direction (parallel to the edge of the step).

According to a further embodiment, the gap range between the sheet leveling / guide device 2, the variable-shaped sheet guide device 3, and the stationary sheet guide device 13 is defined by overlapping the guide surfaces. Can be formed by

Rotatable sheet leveling / guide device 2
Has at least two independent first and second chambers 20, 21 extending in the axial direction.

The second chamber 21 is laterally connectable (at the side frame) to the air supply of the pneumatic system 5 and is a sheet as part of the sheet leveling / guide device 2 Functionally connected to the leveling device. The sheet leveling device in communication with the chamber 21 has a suction slot 4 and a wavy curved leveling gap. The leveling gap with this suction slot 4 extends, in particular, over the shape width, in which case the suction slot is formed by a hole, a slit or a through groove.

The first chamber 20 is operatively connected to a sheet guide device 13 as part of the sheet leveling / guide device 2. The guide surface which communicates with the chamber 20 of the sheet guide device 13 also has the air circulation holes 6, in which case the guide surface is flush with the adjacent sheet guide device 13, And they are arranged in their bending directions as required. The chamber 20 further comprises a sheet-leveling / guiding device 2
Has at least one opening 19 in the axial direction separately from the air flow hole 6 in the guide surface, said opening 19 being functionally located on the end face side of the adjacent stationary sheet guide device 13. Connectable. For this purpose, the sheet guide device 13
Has an opening corresponding to the opening 19 on the end face side of the flow passage, which can be opened and closed by means of a movable, for example, pivot joint and the casing part 18 or 18 '. The opening of the flow passage is open at position 18 of the casing parts 18, 18 ', and at position 18' the opening is closed.

As an alternative, the movable housing parts 18, 18 'can be made flexible, for example from spring steel sheets (FIGS. 2 and 3). In this case the flexible movable casing part 1
8, 18 'are in the extended state at position 18,
As a result, there is a very slight gap between the casing of the sheet leveling / guide device 2 and the opening of the flow passage of the sheet guide device 13. Only when the sheet leveling / guiding device 2 is pivoted about the pivot axis, the flexible casing parts 18, 18 '
It is moved to position 18 'and then spring-returned to extended position 18 again. Therefore, in the state of FIG. 2, the flow path of the sheet guide device 13 is a
In the state of FIG. 3, which is substantially sealed by the adjacent housing of the guide device 2, the opening 19 ensures a pneumatic connection between the flow passage of the sheet guide device 13 and the chamber 20.

Since the flow passage of the sheet guide device 13 is operatively connected to a unique pneumatic system, for example, a plurality of fans, air is supplied to the chamber 20 from the flow passage of the sheet guide device 13. It is possible. This allows the flexible casing parts 18, 18 'to be in the position 18
As a result, the opening of the flow passage of the sheet guide device 13 is opened and connected to the opening 19 of the chamber 20.

The sheet leveling / guiding device 2 is connected to at least one connecting member 7 in the region of a bearing which is fixed with respect to the frame, said connecting member being connected by a pivot joint 8 to a piston rod. Operating device 1 via
7, for example connected to a pneumatic cylinder. With this simple operating device 17, the sheet-sheet leveling / guide device 2
The part (sheet-leveling device or sheet-guiding device) required in each case for guiding the sheet can be pivoted into the working area.

The sheet leveling gap with the guide surface having the air flow openings 6 and the suction slot 4 of the sheet leveling / guide device 2 is preferably provided in the adjacent sheet guiding device 3,
It is flush with 13 guideways.

The sheet leveling / guide device 2 can be used in any form. Thus, in the first configuration, the sheet leveling / guide device 2 is located rearward in the sheet transport direction of the adjacent stationary sheet guide device 13.
In another configuration, it is arranged in front of the sheet guide device 13, and in yet another configuration, it is arranged between two stationary sheet guide devices 13. As a further alternative configuration, the sheet leveling / guide device 2 may be arranged forward in the sheet transport direction 9 of the sheet guide device 3 of variable shape. In addition, sheet paper
It is also possible to attach the guide device 2 to a sheet guiding cylinder 15, for example a transport drum. Such a use example in which the stationary sheet guide device 13 is arranged in the front is described in German Patent No.
It is known from 44 30 105.

The operation of the sheet guiding device is as follows. In the case of single-sided printing, the sheet 11 tends to be curved and warped cylindrically. In this case, the sheet leveling / guide device 2 is pivoted into a position in which the sheet leveling gap with the suction slot 4 substantially fills the working area between the sheet guide devices 13. (FIG. 2). The sheet leveling gap with the suction slot 4 and the guide surface of the stationary sheet guide device 13 are flush in this case to form a sheet guide. In order for the sheet to be guided with its unprinted one side as close as possible to the sheet guide device 13, the fan of the sheet guide device 13 is connected to an air suction device. The pneumatic system 5 is activated and the transported sheet 11 is sucked in the area of the sheet leveling gap with the suction slot 4 and drawn into the wavy contour. At this time, in addition to the suction action, the curl removal effect is achieved by returning the curl of the sheet 11 and stretching the sheet in the direction opposite to the transport direction 9. In this way, the sheet 11 is smoothed and lowered on the delivery pile 12 with high quality.

The movable housing part 18, 18 'is in this case arranged, for example, at the position 18, so that the opening of the flow passage of the sheet guide device 13 is open at the end face. A large air volume flow can be advantageously applied to the flow channel at a slightly lower delivery pressure, so that an open configuration on the end side of the sheet guide device 13 can be operated without substantial air loss. is there. As an optional component, the flexible casing parts 18, 18 'can be manually or by means of another operating device (not shown) in the position 1 position.
It is also possible to fix it at 8 ', so that the opening of the flow passage of the sheet guide device 13 can be closed on the end face side.

In double-sided printing, the above-described warping of the sheet 11 does not occur because both sides of the printing material are processed. The sheet leveling / guiding device 2 includes an operating device 1
7, the sheet leveling device (sheet leveling /
A part of the guide device 2, including the sheet leveling gap with the suction slot 4, is moved out of the working area between the sheet guide devices 13. In addition, the guide surface (part of the sheet leveling / guide device 2) having the air circulation holes 6 of the sheet guide device is rotated into the above-mentioned working area and assigned to the sheet 11 (FIG. 3). .

The flow path of the stationary sheet guide device 13 (here, the sheet guide device 13 provided on the upstream side)
Is supplied with blown air by a fan. The blown air flows out of the guide surface of the sheet guide device 13 through the holes 6 and supports the sheet 11, so that set-off is prevented. At the same time, air blown from the end face of the flow passage (casing portions 18, 18 'is at position 18) of the upstream sheet guide device 13 passes through one or more openings 19 into the adjacent chamber 20. Flows into Blowing air is passed from this chamber 20 through the holes 6 to the sheet guide device 13.
Flows out of the guide surface (part of the sheet leveling / guide device 2), and similarly supports the sheet 11 in the area of the sheet leveling / guide device 2 so that set-off does not occur. I do.
In order to minimize the gap distance between the sheet guide device 13 and the sheet leveling / guide device 2,
During the pivotal movement of the sheet-leveling / guide device 2, the chambers 20, 2
One of the casings is a flexible casing part 1 of the adjacent sheet guide device 13 for a short time.
It may be configured to press 8, 18 '. Since the casing parts 18, 18 'are flexible, for example made of spring steel, this does not impair the function.

Since the adjustable fan of the sheet guide device 13 is switchable in the reverse direction, it is also possible to suck air from the flow passage. When the chamber 20 is pivoted into the working area, the air in this chamber 20 is also sucked through the adjacent sheet guide device 13.

An advantage of the invention is that a suitable sheet guide is guaranteed for both single-sided and double-sided printed sheets.

The sheet-fed sheet leveling / guide device 2 shown in FIG.
The configuration is not limited to the configuration having the two chambers 20 and 21. Another chamber is arranged in the axial direction, and the chamber is
By means of 7, it is also possible for the third chamber to be pivotable into the working area as required. This chamber is configured to have a guide surface with a blowing nozzle / suction nozzle, and to blow / press air to an adjacent sheet guide device 13.
It is also possible to provide a functional connection for suction. The blowing nozzle / suction nozzle improves the tension of the sheet 11.

The sheet leveling / guide device 2 also comprises a stationary sheet guiding device and a shape-variable sheet guiding device 13.
And can be arranged between them. In this case, the only requirement is that the flexible casing part 18, 18 'of the sheet guide device 3 or 13 of one of the stationary sheet guide device and the shape-variable sheet guide device.
, But only in communication with the opening 19 of the sheet leveling / guide device 2.

[Brief description of the drawings]

FIG. 1 is a front view showing a sheet delivery having a sheet guiding device.

FIG. 2 is a front view showing the sheet leveling / guide device having a sheet leveling function in a position for single-sided printing.

FIG. 3 is a front view of the sheet leveling / guiding device of FIG. 2 having a sheet guiding function instead of a sheet leveling function in a position for duplex printing or single-sided printing. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet brake device 2 Sheet leveling / guide device 3 Sheet guide device of variable shape 4 Sheet leveling gap with suction slot 5 Pneumatic system 6 Air flow hole 7 Connecting member 8 Rotating joint 9 sheet transport direction 10 gripper system 11 sheet 12 delivery pile 13 stationary sheet guide device 14 transport system 15 sheet guide cylinder 16 delivery drum 17 operating device 18, 18 'casing part 19 opening 20 first 1st room 21 2nd room

Claims (8)

[Claims] The present invention is used for removing warpage of a sheet processed on one side by a printing press and for guiding the sheet processed on both sides while preventing set-off. A sheet guiding device having a rotatable sheet leveling / guide device, wherein the sheet leveling / guide device (2) comprises a sheet leveling gap with a suction slot (4). A second chamber (21), which is operably connectable to a laterally arranged pneumatic system (5) and which is connected to said sheet leveling / guide device (5). 2) has a first chamber (20) which is connected to a guide surface having an air flow hole (6) and has at least one opening (19) in the axial direction; It has a flow passage through which air can be supplied and sucked, and has an air circulation hole (6) in the guide surface. Sheet guide device (13) being disposed adjacent to if the sheet / guide device (2), wherein the flow passage,
Openable by a movable casing part (18, 18 ') and connected to the opening (19) of said sheet leveling / guide device (2); and said sheet leveling / guide device (2) ) Is a sheet guide device which is rotatable around an axis by an operating device (17). 2. The sheet leveling gap with suction slot (4) of the sheet leveling / guide device (2) and the guide surface with air flow openings (6) are adjacent to the sheet. 2. The sheet guiding device according to claim 1, wherein the sheet guiding device is aligned flush with a guide surface provided with an air flow hole of the paper guiding device. 3. The sheet leveling / guide device (2).
2. The sheet guide device according to claim 1, wherein the at least one is arranged behind a stationary sheet guide device that is adjacent when viewed in the sheet transport direction. 4. The sheet leveling / guide device (2).
2. The sheet guide device according to claim 1, wherein the device is arranged in front of an adjacent fixed sheet guide device when viewed in the sheet transport direction. 5. The sheet leveling / guide device (2).
2. The sheet guide device according to claim 1, wherein the at least one sheet guide device is arranged between two stationary sheet guide devices. 6. The sheet leveling / guiding device (2).
2. The sheet guide device according to claim 1, wherein the device is arranged in front of a variable-shaped sheet guide device as viewed in the sheet transport direction. 3. 7. The sheet leveling / guide device (2).
2. The sheet guiding device according to claim 1, wherein the device is attached to the sheet guiding cylinder. 8. A connecting member (7) is connected to the sheet leveling / guide device (2), and the connecting member is connected to an operating device (17) via a rotary joint (8). 2. The sheet guiding device according to claim 1, wherein the sheet guiding device is provided.