JP2006289975A - Take-in suction device for the reversing drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer a suction device for the reversing drum which has a superior gripping quality and an outstanding adaptability to the various printing materials, especially to the printing materials of different thicknesses. <P>SOLUTION: The invention refers to the suction device for the reversing drum which comprises a suction head 1 manufactured from elastomeric material to offer a sheet supporting surface 2 and the suction cavities 3 formed inside of the suction head 1 to absorb the trailing edge domain of the sheet to be gripped onto the sheet supporting surface 2. The suction head 1 is supported rotate-free by the jointing device 4 thereby the above-mentioned suction head 1 is able to incline at the tilting axis X parallel to the rotating axis of the reversing drum. Moreover, the tilting domain S is so limited by the stopper device 5 which co-works with the suction head 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a take-in suction device for use in a sheet reversing apparatus having a reversing cylinder for performing rear edge reversal.

  According to Patent Document 1, a suction device for a sheet reversing device is known. The suction device is used to initiate gripping of the sheet rear edge from the sheet guide cylinder and to deliver the sheet rear edge region to the gripper system. The suction device is made of a rubber-elastic material and has a sheet support part, which has a suction passage extending deeply into the sheet support part.

  According to Patent Document 2, a suction device for a reversing cylinder of a printing press is also known. The suction device is formed as a jumping suction device (Springsauger), and has a suction head with a sheet contact surface directed to the sheet portion to be sucked. The suction device is formed so that the suction device is drawn immediately after the sheet application surface is covered by the sheet portion (sheet rear edge edge region).

  According to Patent Document 3, a suction control device for controlling a suction device of a sheet delivery cylinder is known. In this case, the suction device is forcibly controlled and moved via the transmission to move the sheet rear edge region captured by the suction device into the gripper region.

In particular, the following problems arise when the suction device is guided along a motion trajectory that is forcibly and dynamically determined. In other words, because of the gripping of the sheet rear edge region, different gripping conditions occur depending on the mechanical properties of the printing material (substrate) and the thickness of the printing material. Variations occur in the edge delivery position, gripping reliability, and gripping accuracy.
German Patent Application Publication No. 3009783 German Patent Application Publication No. 3644315 German Patent Application No. 4012497

  The object of the present invention is to provide a suction device for a reversing device, which is distinguished by advantageous gripping properties and high compatibility with different printing materials, in particular with different thicknesses of printing material.

  The object is, according to the invention, a suction device for a reversing cylinder, a suction head made of an elastomer material for providing a sheet support surface, and a sheet to be picked up A suction cavity formed in the suction head for sucking the rear edge area of the paper to the sheet support surface is provided, and the suction head is supported so as to be capable of swiveling via a coupling device. For the reversing cylinder, the suction head is tiltable about a tilting axis parallel to the rotation axis of the reversing cylinder, and the tilting area is limited by a stopper device cooperating with the sucking head. Solved by a suction device.

  Based on the configuration of the suction device according to the present invention, a suction system that automatically adapts to the respective sheet thickness and stands out with a high delivery accuracy almost unchanged even with different printing material thicknesses. It becomes possible to provide.

  According to a particularly advantageous embodiment of the invention, the coupling device is formed as a hinge coupling. The hinge joint may in particular be realized as a film hinge or a sheet hinge or a foil hinge. The hinge device is further formed such that the suction head is preloaded (ie preloaded) in a pre-defined direction by the hinge device, in particular in an orientation suitable for picking up thin print material. It may be.

  The coupling device is advantageously further arranged in such a way that the tilt axis defined by the coupling device is present in the vicinity of the end region of the suction head located downstream in the sheet running direction and Is formed. This arrangement of the tilting axis makes it possible in particular to grip a relatively thick sheet part, whose rear edge region protrudes from the sheet guide cylinder based on the bending stiffness.

  The suction head is tilted toward the stopper surface as soon as the sheet portion to be captured sits on the sheet support surface and covers the sheet support surface as follows. It can be shaped so that exercise is supported. This support is achieved by enabling the barrel structure or bellows structure based on the negative pressure formed inside the suction head after the sheet support surface is covered by the corresponding sheet part. obtain. The tilting area of the suction head is preferably in the range of about 3-15 °. The end position of the suction head in the open swiveled state is also preferably determined by the stopper structure.

  The suction surface provided by the suction head is pivotally attached to the suction finger body so as to be tiltable via a hinge device or a joint device provided according to the present invention. The suction finger body may form part of a lifting suction device and is pulled back towards the stopper by applying a negative pressure, in particular by applying a negative pressure after the suction surface is covered. In this case, the stopper determines the exact position of the sheet edge to be delivered. The return adjustment of the suction finger can be performed by a spring elastic member (steel spring, elastomer structure, etc.). The joint-type support of the suction head makes it possible to process printing materials with different thicknesses and different bending stiffnesses with high reliability. The swivel motion of the suction head is superimposed on the original suction motion, and as long as this is true, the control of the suction motion is simplified.

The suction finger portion of the suction device that supports the suction head can be operated by means of a corresponding transmission device, as is known from DE 4012498 A1. The tiltable support of the suction head designed according to the invention makes it possible to fully take into account the different material thicknesses of the printing material. The following advantages are obtained in particular by the support according to the invention of the suction head. That is,
-The movable arrangement of the suction head allows the suction head to be positioned to assist in guiding the trailing edge of the sheet along an ideal sheet guide path. Thereby, the adsorber movement can be simplified accordingly.
-The suction device is automatically adjusted to the thickness of the printing material to be processed each time, and this adjustment may in some cases handle material that would be overloaded in conventional systems. It becomes possible.
The spring member can be designed to be relatively weak, since the spring member sits directly on the working point. This results in the component being subjected to a relatively weak load.

  Further details and features of the invention can be taken from the following description with reference to the drawings.

  The suction device for the reversing cylinder shown in FIG. 1 has a suction head 1, which is preferably made of an elastomer material and itself provides a sheet support surface 2. To work.

  A plurality of suction cavities 3 are formed in the suction head 1, and the suction cavities communicate with a suction passage extending below the sheet support surface 2. A pressure lower than the ambient pressure can be applied to the suction passage, so that the rear edge region of the sheet is adsorbed to the sheet supporting surface 2 within the frame where the rear edge inversion starts. ing.

  The suction head 1 is supported via a joint device 4 so as to be capable of turning. As a result, the suction head can be tilted about the tilt axis X parallel to the rotation axis of the reversing cylinder (not shown here). The tilting region S is limited by a stopper device 5 that cooperates with the suction head 1.

  The joint device 4 is formed as a hinge joint. The tilt axis X defined by the joint device 4 extends in the vicinity of the end region of the suction head 1 that is located downstream as viewed in the sheet running direction BLR. In this embodiment, the joint device 4 is formed as a film hinge, a sheet hinge, or a foil hinge (Folienscharnier). The suction head 1 is connected to the suction finger base 7 via a fixed structure (here, simply shown as a screw 6) through the film or seat hinge. In this embodiment, the stopper device 5 is directly realized by the suction finger base 7 which cooperates with the structure 1a incorporated in the suction head 1 or connected to the suction head.

  As can be seen from FIG. 2, in the inner region of the suction finger base 7, there is an air guiding device 8 that can be axially shortened or crushed. In the present embodiment, the air guiding device 8 is formed as a folding bellows / hose. As soon as the sheet support surface 2 of the suction head 1 is covered by the rear edge region of the sheet to be captured, the folding bellows hose is shortened (aktiv) and the suction head 1 is actively Tilt toward the stopper surface 5. In this state, the rear edge region of the sheet, which is reliably captured by the suction head 1 and tilted back as defined by the turning angle S, can approach the gripper system by forcibly guiding the suction finger base 7. Can be moved into the gripper region in a manner known per se (see in particular DE 40 12 497 A1).

  FIG. 3 shows again the advantageous configuration of the suction cavity 3 extending into the suction head 1. The holding action achieved by the suction head 1 acts on the back side of the sheet in which the sheet part supported by the sheet support surface 2 is directed to the side opposite to the sheet support surface 2. This is based on being pressed against the sheet supporting surface 2 by the ambient pressure. The sheet support surface 2 is advantageously made from a material that ensures a sufficient lateral force transmission capacity under the action of the pressing force generated by the pressure difference.

FIG. 3 is a perspective view showing a suction device according to the present invention for a reversing cylinder. It is another perspective view which shows the said suction device in order to demonstrate the folding bellows apparatus integrated in the suction device by this invention. FIG. 3 is another view showing the suction device according to FIGS. 1 and 2 in order to more specifically show the sheet support surface provided by the suction head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adsorption head 1a Structure incorporated in the adsorption head or connected to the adsorption head 2 Sheet paper support surface 3 Suction cavity 4 Joint device 5 Stopper device 6 Screw 7 Suction finger base 8 Air guiding device (air guide structure) body)
S Turning angle X Tilt axis BLR Sheet running direction

Claims (7)

A suction device for a reversing cylinder,
A suction head (1) made of an elastomeric material to provide a sheet support surface (2);
A suction cavity (3) formed in the suction head (1) for sucking the sheet rear edge region to be gripped on the sheet support surface (2);
The suction head (1) is supported through a joint device (4) so as to be capable of swiveling movement, so that the suction head (1) has a tilt axis (X) parallel to the rotation axis of the reversing cylinder. Suction device for a reversing cylinder, characterized in that it can tilt as a center and the tilting area (S) is limited by a stopper device (5) cooperating with the suction head (1).   Suction device according to claim 1, wherein the coupling device (4) is formed as a hinge coupling.   The tilting axis (X) defined by the joint device (4) is present in the vicinity of the end region located downstream of the suction head (1) in the sheet running direction. The inhaler described.   Suction device according to claim 2, wherein the hinge device (4) is formed as a film hinge.   The tilting movement of the suction head (1) toward the stopper surface is supported as soon as the sheet part to be captured covers the sheet support surface (2). The suction device according to any one of the above.   6. A suction device according to claim 5, wherein the tilting movement of the suction head (1) towards the stopper surface is supported in cooperation with a negative pressure supply device to the suction head (1).   The tilting movement of the suction head is supported by a deformable, in particular bellows air guide structure (8), which is under the action of the procured negative pressure. The suction device according to claim 6, wherein the suction device is shortened.

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