DE102007005403A1 - Sheet-separating suction device for feeder of sheet printing press, has drive device including stroke length adjusting device for fixing suction position by adjustment of length of stroke of cup along vertical running path - Google Patents

Abstract

The device has a suction cup (1) retractable along a vertical running path (V) from a retraction end position (R) at an upper side of a sheet stack (2) to a suction position (S). The cup is liftable in a vertical direction, when a topmost sheet (B) of the stack is lifted. A drive device shifts the cup along the path. An adjusting device adjusts the suction position. The drive device has a stroke length adjusting device (3) for fixing the suction position by adjusting the length of the stroke along the path.

Description

The The invention relates to a separating suction device for a Sheet-fed printing machine according to the preamble of patent claim 1.

For The sheet separation in sheet feeders it is known, suckers, as such to arrange separating suction, as such along a in the Essentially vertical track to the top of an in the sheet feeder arranged sheet pile are lowered down. The Suckers become after picking up the top sheet of the sheet pile raised in the vertical direction. For this purpose, a drive device provided to the displacement of the nipple along that substantially vertically oriented track.

Out DE 20 2005 007 397 U1 a Trennsaugereinrichtung for a sheet-fed press is known, which has a substantially vertically movable suction cups. By this sucker, it is possible to pick up the top sheet of a sheet pile in a region adjacent to the rear transverse edge of the sheet pile and slightly raise. Under the uppermost arch thus raised, air can be blown in through a blowing nozzle device, by means of which the separation of the uppermost sheet from the sheet stack is further assisted.

Out DE 199 430 30 A1 is a sheet-fed press whose feeder is also provided with a Trennsaugereinrichtung through which viewed in the sheet running direction rear transverse edge region of the uppermost sheet of a sheet pile can be taken.

Out DE 40 061 44 C2 a Trennsaugereinrichtung for a sheet-fed printing machine is known, in which the raising and lowering of a provided for singulating the signature suckers is accomplished by a cam mechanism. The entire, provided for driving the nipple mechanism is adjustable positionable in the vertical direction.

Out DE 197 217 67 A1 a Trennsaugereinrichtung is known, in which the lowering of a nipple on an upper side of a sheet stack is accomplished by a cylinder device, wherein this cylinder device clocked is subjected to a pressure below the ambient pressure level.

Of the Invention has for its object to provide solutions through which printing materials of various kinds reliable can be isolated.

The The aforementioned object is achieved according to the invention with the features of claim 1.

• – einem Sauger der als solcher entlang einer im Wesentlichen vertikal verlaufenden Bahn aus einer Rückzugsendstellung zu der Oberseite eines Bogenstapels hin in eine Saugstellung absenkbar und unter Aufgriff des obersten Bogens des Bogenstapels in vertikaler Richtung anhebbar ist,
• – einer Antriebseinrichtung zur Verlagerung des Saugers entlang jener im Wesentlichen vertikal ausgerichteten Bahn, und
• – einer Einstelleinrichtung zur Einstellung der Saugstellung des Saugers,
• – wobei sich diese Trennsaugereinrichtung dadurch auszeichnet, dass die Antriebseinrichtung eine Hublängenstelleinrichtung umfasst zur Festlegung der Saugstellung durch Abstimmung der Länge des durch den Sauger entlang der Bahn zurückgelegten Hubes.

The invention is accordingly embodied by a separating suction device for a sheet-fed printing press with:

• A sucker which, as such, can be lowered into a suction position along a substantially vertically extending path from a return end position to the upper side of a sheet stack and can be raised in the vertical direction by picking up the uppermost sheet of the sheet stack,
• - Drive means for displacing the nipple along that substantially vertically oriented path, and
• A setting device for adjusting the suction position of the nipple,
• - wherein this Trennsaugereinrichtung is characterized in that the drive means comprises a stroke length adjusting means for determining the suction position by tuning the length of the distance traveled by the sucker along the path Hub.

Thereby it is possible in an advantageous manner, the suction position of the teat regardless of the Rückzugsendstellung to tune the nipple. Based on this concept, it becomes possible by setting a specific to the characteristics of each to be processed printing material matched residual gap between the sucker and the top of the sheet pile one for the reliable sheet separation optimum picking situation to ensure.

By the invention provided stroke length adjusting device will continue to be possible under the operation of the Investor occurring fluctuations in the position of the top Sheet position of a sheet pile with high dynamics, so that the successively tapped sheets of the sheet pile each with be sucked up constant suction nips.

According to one particularly preferred embodiment of the invention an actuator provided for effecting the adjustment the stroke length via an electronic control device. This actuating device can in particular one, for example comprise drive designed as a stepper motor. about this drive, for example, the adjustment of the stroke length appropriate positioning of one for the determination of Suction position relevant attack done.

It is possible to configure the control device such that the adjustment of the stroke length in accordance with a current, respect Lich the vertical position of the cover layer of the sheet stack indicative signal is accomplished. This signal, which is indicative of the vertical position of the uppermost layer of the sheet stack, can be generated in particular by optical means, such as light barrier systems, based on the position of light spots, or preferably also on the basis of an image processing concept.

It is also possible, in terms of position and orientation the stack top to raise indicative signal by measuring means which are integrated directly into the suction device. These measuring devices can be designed in particular as ultrasonic sensors be.

It is possible in the range of Trennsaugereinrichtung also Provide detection means, by which a detection of the course the top sheet layer in the for the attack by the Sucker authoritative bow area is made possible. This makes it possible in particular, curvatures of Cover layer of the sheet pile to capture and automates the sucker align so that its orientation is essentially the orientation corresponds to the aufzufreifenden portion of the substrate.

Preferably the vacuum is applied alternately with negative pressure. To accomplish this alternating negative pressure is preferably a valve device provided, which is controlled by a control device becomes. It is possible the timing of the negative pressure as well as those intended for the handling of the printing material To tune suction distance in a way that is a particularly reliable Separation of the sheet layers allows. These settings can for a variety of substrates, preferably be determined empirically. Based on printing material-specific information can then automatically an optimal setting of Trennsaugereinrichtung be initiated.

It is possible to set the stroke length provided control device and preferably also to the control the negative pressure control device provided in such a way connect a console computer that a corresponding configuration the separating suction device is based on print job information, for example, in the area of the control center access can be.

Further Details and features of the invention will become apparent from the following Description in connection with the drawing. It shows:

1 1 is a schematic illustration for illustrating the construction of a separating suction device according to the invention for the feeder of a sheet-fed printing press;

2 a schematic representation to illustrate the control technology connection of a Trennsaugereinrichtung invention to a central computer,

3 Sketches to illustrate a wide variety of characteristics of the rear transverse edge region of a sheet pile.

1 shows a Trennsaugereinrichtung for a sheet-fed press, as such a sucker 1 which is movable along a substantially vertically extending path V.

The sucker 1 is lowered along the vertically extending path V from a Rückzugsendstellung R vertically downward in a suction position S. When the suction position S is reached, vacuum is applied to the nipple 1 an absorption of the top sheet of the pile of sheets 2 , This is the top sheet B of the sheet pile 2 through the nipple 1 addressed. The picked up bow is in the context of the withdrawal of the teat 1 raised to the level defined by the Rückzugsendstellung R level. At this height level, the one from the sheet pile becomes 2 For example, separated sheets are transferred to a drag sucker not shown here.

The Trennsaugereinrichtung shown here is characterized in that the vertical displacement of the sucker 1 provided drive means a stroke length adjusting device 3 includes, so that the position of the suction position S by tuning the length of the suction from the 1 when lowering completed stroke can be determined. This stroke length adjusting device comprises an actuating drive device in the exemplary embodiment shown here 4 for automatically making the adjustment of the stroke length in accordance with a by a control device C (see 2 ) provided control signal.

at The embodiment shown here is the drive device formed such that the Rückzugsendposition R independently can be fixed by the stroke length. In particular, this is here shown embodiment, the drive device such designed that, regardless of the about the stroke length adjustment device Changes made to the stroke length always the same Rückzugsendposition R can be approached.

By adjusting the stroke length and the thus facilitated bringing about different suction positions S1, S2, S3 it is possible Lich, an optimal for the Aufgriff of the printing material to be processed suction gap between the sucker 1 and to ensure the stack top. This suction gap is preferably matched to the mechanical properties of the printing substrate.

In the embodiment shown here, the adjustment is made for the vertical displacement of the nipple 1 authoritative stroke length via a stop device 5 , in accordance with the drive device 4 is positioned. For fixing the return end position, a stop device is preferably also provided. It is possible, even these decisive for the determination of the Rückzugsendstellung R anchor device 5 be designed so that this Rückzugsendstellung R is automatically adjustable via an actuator. Otherwise, it is also possible, this Rückzugsendstellung R by appropriate vertical positioning of the entire Saugerantriebseinrichtung supporting suction head unit 7 set.

As shown in the illustration 2 can be seen, the control of the Trennsaugereinrichtung invention takes place via a control device C which is preferably connected to a control computer LS, or via another, preferably provided in the area of the sheet feeder user interface is accessible.

The control device C is formed in this embodiment such that this setting of the stroke length and thus the vertical height level of the teat 1 upon reaching the suction position S taking into account a respect to the vertical position of the cover layer of the sheet pile 2 indicative signal.

With regard to the height level of the uppermost layer of the sheet pile 2 indicative signal can be generated by optical means, such as light barriers, laser diodes or image processing systems. It is also possible to generate the signal indicative of the height level of the stack top by other distance measuring systems, in particular ultrasonic sensor systems. These ultrasonic sensor systems may include ultrasonic sensors that are directly in the alternately up and down suckers 1 are involved. Furthermore, it is possible with respect to the spatial course of the top sheet layer in the for the attack by the sucker 1 relevant arc area to generate indicative information and this in the control of Trennsaugereinrichtung, especially when tuning the stroke length and possibly also in the spatial orientation of the sucker 1 to take into account.

In the Trennsaugereinrichtung invention shown here, the control of the vertical displacement of the nipple takes place 1 authoritative drive device 8th in accordance with signals provided by the controller C. This drive device 8th can be designed in particular as an electromechanical drive device or as a pneumatic drive device. It is also possible for vertical displacement of the nipple 1 provided drive device 8th to realize as eccentric or cam mechanism.

The admission of the teat 1 with negative pressure, ie the extraction of air from the area of the nipple 1 takes place in the embodiment shown here via a suction line 9 and a valve device 10 , This valve device 10 is also controlled via the control device C. To determine the suction position of the teat 1 is a stop device 5 provided by which the vertical displacement path of the nipple 1 is limited to the bottom. This stop device 5 is positioned via an adjusting device in an adjustable changeable manner. The control of this actuator device is also carried out via the control unit C. The control unit C is connected to a control computer LS. With regard to the vertical position of the cover layer of the sheet pile 2 indicative signals are in this embodiment by optical means 11 generated and the controller C provided. It is also possible for the measuring means provided with regard to the detection of the vertical position of the uppermost sheet layer to be directly in the separating suction device, in particular the suction device 1 integrate.

In 3 are exemplary various stacks of sheets 2 shown. The distance changes resulting from the retraction end position as well as the different orientations of the edge region of the sheet stack which can be seen in this illustration can be recognized by the separating suction device according to the invention and compensated for with high dynamics.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 202005007397 U1 [0003]
• - DE 19943030 A1 [0004]
• - DE 4006144 C2 [0005]
• - DE 19721767 A1 [0006]

Claims (14)

Separating suction device for a sheet-fed printing press with: - a suction device ( 1 as such, along a substantially vertical path (V) from a return end position (R) to the top of a sheet stack (FIG. 2 ) down into a suction position (S) lowered and under attack of the uppermost sheet (B) of the sheet pile ( 2 ) is liftable in the vertical direction, - a drive means for displacing the nipple ( 1 ) along said substantially vertically oriented web (V), and - an adjusting device for adjusting the suction position (S) of the sucker ( 1 ), characterized in that the drive device comprises a stroke length adjusting device ( 3 ) comprises determining the suction position (S) by tuning the length of the suction by the ( 1 ) along the path (V) Hubs. Separating suction device according to claim 1, characterized in that an actuating drive device ( 4 ) is provided for effecting the adjustment of the stroke length in accordance with a control device (C). Separating suction device according to claim 2, characterized in that the control device (C) is designed such that this setting of the stroke length in accordance with a with respect to the vertical position of the cover layer of the sheet pile ( 2 ) indicative signal accomplished. Separating suction device according to claim 2, characterized in that the drive device is designed such that the return end position (R) independent of the suction position (S) can be fixed. Separating suction device according to claim 3, characterized that with regard to the height level of the stack top indicative signal is generated by optical means. Separating suction device according to claim 3, characterized that the signal indicative of the position of the stack top is determined by an ultrasonic sensor. Separating suction device according to claim 6, characterized in that the ultrasonic sensor in the sucker ( 1 ) is involved. Separating suction device according to claim 1, characterized in that a detection device is provided for detecting the course of the uppermost sheet layer in the for the attack by the sucker ( 1 ) relevant arc range. Separating suction device according to claim 1, characterized in that a valve device ( 10 ) is provided for causing the negative pressure of the nipple ( 1 ). Separating suction device according to claim 1, characterized in that the valve device ( 10 ) is controlled via a control device (C). Separating suction device according to claim 10, characterized characterized in that via the control device (C) of the time course of the negative pressure is tunable. Separating suction device according to claim 2, characterized characterized in that for adjusting the stroke length, or the Hubendstellung provided control device (C) to a Control station computer (LS) is connected. Separating suction device according to claim 1, characterized characterized in that the configuration of the Trennsaugereinrichtung based on print job information. Separating suction device according to claim 1, characterized characterized in that the stroke length adjustable by adjustable Positioning a stop device is set.