DE20313394U1 - Sheet delivery device for paper processing machine has sheet guiding device above upper run of sheet feed system and during sheet withdrawal is periodically movable from inactive initial position into sheet guiding position - Google Patents

Abstract

The sheet delivery device for a paper processing machine has a sheet guiding device (15) located above the upper run (12) of the sheet feed system (5). During sheet withdrawal by a drum (6) the sheet guiding device directly after the passing over of a first gripper system installed on the sheet feed system is periodically movable from an inactive initial position in the direction of the drum into a sheet guiding position, and before the passing over of a second gripper system is moved back into the initial position.

Description

. MAN IROLANDI

MAN Roland Druckmaschinen AG Mühlheimer Str. 341 D-63075 Offenbach

Delivery device for a sheet processing machine

The invention relates to a delivery device for a sheet processing machine according to the preamble of claim 1. Such a delivery device can preferably be used on sheet-fed printing and/or sheet-coating machines.

A delivery device of this type is known from DE 198 19 491 C1 for a rotary printing machine with a continuously rotating conveyor system that feeds the sheets to a first delivery stack and with a drum that acts as a switch in front of the delivery stack and has at least one gripper system. The sheet-guiding drum is used for selective or constant sheet removal and is assigned to the lower run of the conveyor system. For the purpose of depositing the sheets, another stacking system is assigned adjacent to the drum. Outside the lower run, a sheet guide device that can preferably be actuated pneumatically is arranged with a recess that runs across the format width. The gripper system of the drum intersects this recess with its flight circle and the further stacking system is arranged approximately below the drum.

The invention is based on the object of creating a delivery device of the type mentioned at the outset, which has an improved sheet guide, in particular in the conveying direction in the region of a sheet-guiding drum acting as a switch, and allows a safe transport of the sheets when leaving the sheet conveying level.

. MAN . IRELANDl

The problem is solved by the training features of claim 1. Further developments arise from the subclaims.

A first advantage is that in the delivery device with an activatable drum that acts as a switch, a sheet guide device that can be activated as needed and is assigned to the drum is arranged above the gripper systems of the sheet conveyor system that transport the sheets in a sheet conveyor level. This sheet guide device supports the sheets transported away by the drum when they leave the sheet conveyor level.

In a first operating mode, the sheet guiding device in a basic position (first position) is inactive and the printed and/or varnished sheets are fed in a known manner by means of a sheet conveyor system along the sheet conveyor level to a delivery stack and deposited there. The drum can preferably be driven in rotation synchronously with the sheet conveyor system, with the gripper systems of the drum being inactive. Alternatively, the drum can be stopped and, if required, activated synchronously with the rotating sheet conveyor system.

In a second mode of operation, at least one sheet can be transported out of the sheet conveying plane by means of the rotating drum. For this purpose, the sheet guiding device can be moved from the basic position, taking into account the rotating gripper systems of the sheet conveying system in the direction of the sheet conveying plane or the drum, periodically into a sheet guiding position (second position) and back into the basic position. Immediately after passing a first gripper system arranged on the sheet conveying system, which has transferred the sheet to a gripper system of the drum, the sheet guiding device is moved from the basic position into the sheet guiding position and before passing a subsequent second gripper system

. MAN ₃ JROLANDl

(sheet conveyor system) is moved back to the home position. Depending on the mode of operation, the sheet guiding device then remains in the home position or, immediately after passing the second gripper system (sheet conveyor system), the sheet guiding device is moved from the home position back towards the sheet conveyor level into the sheet guiding position and moved to the home position before passing the subsequent third gripper system (sheet conveyor system), etc.

By periodically moving the sheet guide device, each printed and/or varnished sheet fixed on the drum in the gripper closure

&iacgr;&ogr; is safely guided when leaving the sheet conveying level.

A second advantage is that the sheet fed by a gripper system arranged on the sheet conveyor system and transferred to the gripper system arranged on the drum is fixed to the drum in the area of the front edge in the gripper lock and is adequately guided by the sheet guide device in the area of the rear edge when leaving the sheet conveyor level. Turning over of the rear corners of the sheet is thus avoidable. Possible damage to the sheet, particularly in the area of the rear edge of the sheet, or disruptions in the sheet travel are avoidable. Furthermore, possible damage to the sheet guide device, for example to the guide plate, or possible paint/varnish deposits on a sheet guide device downstream of the recess for ejecting the sheets can be avoided.
In addition to the drum, a sheet transfer device is arranged at a distance below the lower run so that when leaving the sheet conveying plane, the function of the sheet guide is ensured for each sheet transported by the drum essentially over its sheet length.

It is also advantageous that the periodic movement of the sheet guiding device takes place synchronously with the gripper systems rotating in the sheet conveying system and the gripper systems on the drum, so that a possible

. MAN . IRELAND

Collision (between a gripper system of the sheet conveying system and the sheet guiding device) can be avoided. The drive of the sheet guiding device is preferably coupled to the drive of the delivery device or the drum. Alternatively, a separate drive can also be used.

The invention will be explained in more detail using an embodiment example. The following diagrammatically shows:

Fig.1 a delivery device with a switch acting as a

&iacgr;&ogr; drum,

Fig. 2 a design of a drivable sheet guide

facility (B-side view),

Fig. 3 the design according to Fig. 2 in A-side view

Fig. 4 the sheet guiding device according to Fig. 2 in basic and

Bow guidance position (overlaid display).

In a sheet-fed rotary printing press, a delivery device 7 is arranged downstream of a printing or coating unit 1, for example with a blanket/form cylinder 2, a printing cylinder 4 and an upstream transfer cylinder 3, in the conveying direction 10 of the sheets to be deposited. The delivery device 7 consists, among other things, of an endlessly rotating sheet conveyor system 5 with several gripper systems fixed to it at intervals, the sheet conveyor system 5 being designed, preferably as a chain conveyor, with an upper and a lower run 11, 12. In a first operating mode, the sheet conveyor system 5 feeds printed and/or varnished sheets to a delivery stack 8 and deposits them there.

The lower run 12 of the sheet conveyor system 5 is in a small

. MAN IROLANDI

A modular sheet guiding device 13, which can preferably be actuated pneumatically, is assigned to the sheet guiding device 13. Outside the lower run 12, a recess 43 running across the format width is arranged in the sheet guiding device 13 at a short distance from the sheet conveying system 5. The sheets are discharged from the conveying plane in the direction of a drum 6 through the recess 43. The size of the recess 43 in the conveying direction 10 of the sheets can preferably be changed. For example, the sheet guiding device 13 arranged downstream of the recess 43 in the conveying direction 10 can preferably be adjusted in length in or against the conveying direction 10. This sheet guiding device 13 has

&iacgr;&ogr; at least one guide surface which can be moved telescopically in or against the conveying direction 10 in order to reduce or enlarge the recess 43. If the sheet guiding device 13 is designed as a flow channel coupled to a pneumatic system for blowing air or suction air operation (with nozzles in the guide surface), this can be reduced or enlarged in a similar manner in a telescopic manner. The recess 43 can be used with a relatively small opening for thin, flexible printing materials and with a relatively large opening for heavier, rigid printing materials. The telescopic length adjustment of the sheet guiding device 13 takes place by means of actuating devices arranged on the side frames (inside), which are preferably coupled to a machine control system and are connected to the movable part of the sheet guiding device 13. The actuating devices are designed, for example, as pneumatically controllable working cylinders.

Each sheet guiding device 13 is preferably coupled to a switchable pneumatic system that can be operated in suction or blowing air mode. The drum 6, which guides sheets when required, is assigned to the lower run 12 in the area of the recess 43. The drum 6 has at least one gripper system on its circumference, which intersects the recess with its flight circle. In the present example, a depositing device 9 for depositing sheets is provided approximately below the drum 6. In an alternative embodiment, instead of the depositing device 9, the drum 6 is directly connected to a further

. MAN .

IRELANDl

Processing station or an interface to another processing station can be ordered subsequently.

The sheet conveying system 5 extends over the delivery stack 8, which functions as the main stack. In the conveying direction 10, the sheet-guiding drum 6 is assigned to the sheet conveying system 5 in front of the delivery stack 8. If required, a powder and/or dryer device 16 is arranged upstream and/or downstream of the drum 6 in the conveying direction 10. The drum 6 is preferably designed as a double-sized drum 6 with two gripper systems arranged symmetrically around the circumference, based on a single-sized blanket/forme cylinder 2. Alternatively, the drum 6 can be designed with a single-sized diameter and one gripper system, or with multiple-sized diameters with a corresponding number of gripper systems arranged symmetrically around the circumference.

The activatable drum 6 acts as a switch for the selective or constant removal of sheets from the sheet conveying plane of the sheet conveying system 5 rotating in the direction of the delivery stack 8. For this purpose, the drum 6 is preferably assigned to the sheet conveying system 5 in a horizontally arranged part thereof.

In the direction of rotation of the drum 6, a sheet transfer device 14 is arranged in the sheet outlet at a defined distance from the flight circle of the gripper systems, which is preferably coupled to a pneumatic system that can be operated, for example, in blow air and/or suction air mode. The sheet transfer device 14 thus supports the guidance of the individual sheets on the drum 6.

Above the lower run 12, adjacent to the drum 6, a sheet guiding device 15 is arranged in the delivery device 7. The sheet guiding device 15 has a transverse to the conveying direction 10 over the maximum

. MAN ₇ JROLANDI

The machine has a preferably tubular cross member 18 which extends over a maximum format width and is accommodated on the frame side in bearings 17 in the pivoting direction 19 (Fig. 2, 4; double arrow). At least one guide element 20 is preferably arranged over the format width on the cross member 18 (in the conveying direction 10).

In the present example, several guide elements 20 are arranged at intervals on the cross member 18 (Fig. 2). In a simple embodiment, the guide elements 20 are tongue-shaped; in a further embodiment, the guide elements 20 are provided with a paint- and/or varnish-repellent coating.

&iacgr;&ogr; Alternatively, instead of the tongue-shaped guide elements 20, several guide elements 20 provided with rollers are arranged on the cross member 18. The rollers are rotatably mounted at least in the conveying direction 10. In a further embodiment, the sheet guiding device 15 can also be operated with blown air and is coupled to a pneumatic system for this purpose. For example, the preferably tongue-shaped guide elements 20 are provided with openings directed in the conveying direction 10 towards the sheet conveying plane or the sheet for the passage of air (Fig. 2, arrows on the guide elements 20). The sheet guidance is thus supported by means of blown air. The cross member 18 is hollow and for this purpose has an internal, pneumatically actuated main channel which is coupled along its extent to secondary channels running in the hollow guide elements 20 and opens out at the above-mentioned openings. The main channel is coupled to the pneumatic system, for example, by means of a rotary union arranged on the frame. Alternatively, a guide element 20 extending over the maximum format width can be arranged on the cross member 18. If required, this guide element is a hollow body with a guide surface assigned to the sheet with openings for the passage of air. The hollow body of the guide element 20 is connected to the main channel of the cross member 18 and the hollow-shaped cross member 18 is in turn coupled to a pneumatic system for the blowing air supply. A gear mechanism 21, 22 is arranged on the sheet guide device 15, which is preferably driven by a coupling gear 21 and a drivable cam gear.

. MAN IROLANDI

be 22 is formed. The coupling gear 21 and the cam gear 22 control the periodic pivoting movement of the sheet guiding device 15, here around the axis of the bearings 17.
For example, the coupling gear 21 consists of a coupling 23 arranged on the cross member 18, which is operatively connected to a ternary member 24. The ternary member 24 has a rotary joint 25 (first joint) which is connected to the coupling 23, a frame-fixed rotary joint 26 (second joint) and a rotary joint 27 (third joint) which carries a spring-loaded cam roller 28. The cam roller 28 is assigned to a control cam 29 which is arranged on the drum axis 30 and is connected to the rotationally driven drum 6.

To secure the basic position of the sheet guiding device 15 in particular, a locking device 31 is provided which acts on the cam/coupling gear 22, 21 and is preferably coupled to a central control. The locking device 31 consists, for example, of a roller lever 33 which is arranged parallel to the ternary member 24 and has the swivel joints 38 and . A spring-loaded cam roller 32 is mounted in the swivel joint 38 and can be brought into engagement with a control cam 42 (which lies parallel to the control cam 29). The roller lever 33 is mounted in the swivel joint 26 which is fixed to the frame and in which the ternary member 24 is also mounted. A locking arm 34 is arranged on the end of the roller lever 33 opposite the cam roller 32. A locking pawl 37 which is mounted in a swivel joint 39 which is fixed to the frame is assigned adjacent to the locking arm 34. The locking pawl 37 is coupled at the other end by means of a swivel joint 40 to an actuating device 36 mounted on the frame, preferably a pneumatically actuated working cylinder. The ternary member 24 has a curve 35 arranged adjacent to the locking arm 34 and a shoulder 41 adjoins the curve 35 in the direction of the swivel joint 26 fixed to the frame.

The mode of operation is as follows: The sheets transported in the delivery device 7 by the sheet conveyor system 5 pass the upstream powder/

. MAN lROLANDl

Dryer systems 16 in the conveying direction 10 and are fed to the delivery stack 8 in the first operating mode and deposited there. The gripper systems of the drivable drum 6 are inactive, the drum 6 is preferably synchronously coupled to the sheet conveying system 5. The sheet guiding device 15 is arranged in the basic position.

If, according to the second operating mode, a sheet is to leave the sheet conveying plane, the sheet is transferred from a gripper system of the sheet conveying system 5 to an activated gripper system of the drum 6. After the gripper system fixed to the sheet conveying system 5 has passed the sheet guiding device 15, the sheet guiding device 15 is moved into the sheet guiding position, i.e. in the direction of the sheet conveying system 5 or drum 6. When designed with a traverse 18, the sheet guiding device 15 pivots about the axis of rotation defined by the bearings 17. Before passing the subsequent gripper system fixed to the sheet conveying system 5, the sheet guiding device 15 pivots back into the basic position. Preferably, the sheet guiding device 15 is arranged in the sheet guiding position approximately flush with the curved sheet transfer device 14, so that the sheet is adequately guided when leaving the sheet conveying plane. The sheet is fed in the direction of rotation of the drum 6 to the downstream depositing device 9 or a further processing station.

The locking device 31 is used to secure the basic position of the sheet guiding device 15. In the basic position of the sheet guiding device 15, the locking pawl 37 is paired with the curve 35, so that the cam roller 28 is disengaged from the control cam 29. If the sheet guiding device 15 is to be activated, i.e. moved into the sheet guiding position, the actuating device 36, preferably a pneumatic cylinder, is activated by the machine control. The locking pawl 37 pivots about the pivot 39 and slides on the curve 35 up to the stop surface on the locking arm 34 (contact). The contact is maintained until the cam roller 32 paired with the control cam 42 is moved due to the law of motion.

. MAN IROLANI

zes pivots around the frame-fixed pivot joint 26 so that the locking arm 34 can be moved under the contour of the curve 35. Since the actuating device 36 is still activated, the locking pawl 37 leaves the curve 35 and dips into the free shoulder 41 (actuating device 36 is extended to the end position). The actuating device 36 remains in the end position, the cam roller 28 is paired with the control cam 29 in this position and the sheet guiding device 15 is thus in the sheet guiding position.

If the sheet guide device 15 is to be returned to the basic position, the ternary member 24 is pivoted about the axis of the frame-fixed swivel joint 26 due to the law of motion of the control curve 29. The distance between the curve 35 (on the ternary member 24) and the pawl 37 increases in such a way that the pawl 37 can run onto the curve 35. To do this, the actuating device 36 is controlled in the opposite direction to the sheet guide position so that the pawl 37 is pivoted about the axis of the frame-fixed swivel joint 39 and is paired with the curve 35 again. Due to the element pairing (curve 35, pawl 37), the cam roller 28 is lifted off the control curve 29 and thus separated, so that the basic position already described is reached again.

The drivable sheet guiding device 15 is not limited to the present embodiment. Rather, for example, the locking device 31, in particular the spring-loaded cam roller 32, roller lever 33 and locking arm 34, can be replaced by an actuating device that can be activated at an angle by means of the machine control, preferably a pneumatic working cylinder. This also means that the control cam 42 can be omitted and the function of the actuating device 36 can be taken over by this actuating device. Since the actuating device is coupled to the machine control, preferably to the control station that records the number of sheets, the actuating device can be switched taking into account the number of sheets to be processed.

·

_&eegr; JROLANDl

Reference symbol list

1 Printing/coating unit ϕ ϕ ϕ ϕ ϕ
φφφφ
φφφφ
ϕ ϕ ϕ ϕ ϕ 2 Blanket/form cylinder 3 Transfer cylinder 4 Pressure cylinder 5 Sheet conveying system 6 drum 7 Laying device 8th Boom stack 9 Storage facility 10 Conveying direction 11 upper run 12 - lower run 13 Sheet guiding device 14 Sheet transfer device 15 - Sheet guiding device 16 Powder and/or drying device 17 storage 18 traverse 19 - Panning direction (double arrow) 20 Guide element 21 Coupling gear 22 Cam gear 23 Paddock 24 ternary member 25 Swivel joint 26 - frame-mounted swivel joint 27 Swivel joint 28 Cam roller φ φ φ &phgr;&phgr;&phgr;&phgr; φ φφ φ &phgr;&phgr;&phgr;&phgr;
••&phgr;&phgr;&phgr;&phgr;&phgr;&phgr;&phgr; φ φ &phgr;&phgr;&phgr;&phgr;&phgr;
• · φ &phgr;&phgr;&phgr;&phgr; φ φ φ φφφ &phgr;&phgr;&phgr;&phgr;

12 Control curve 29 Drum axle 30 Locking device 31 Cam roller 32 Roller lever 33 Locking arm 34 Curve 35 Actuating device 36 - pawl 37 Swivel joint 38 frame-mounted swivel joint 39 - Swivel joint 40 Paragraph 41 Control curve 42 Recess 43

. MAN . IRELAND

Claims (10)

1. Delivery device for a sheet processing machine with an endlessly rotating sheet conveyor system that feeds the sheets to a delivery stack and with a drum for sheet removal that acts as a switch in the conveying direction in front of this delivery stack and has at least one gripper system, wherein the drum is assigned to the lower run of the sheet conveyor system, and a sheet guide device with a recess running across the format width for the discharge of sheets is arranged at a short distance from the lower run, characterized in that a sheet guide device ( 15 ) adjacent to the drum ( 6 ) is arranged above the lower run ( 12 ) of the sheet conveyor system ( 5 ), that when sheets are removed by means of the drum ( 6 ), the sheet guide device ( 15 ) can be moved periodically from an inactive basic position in the direction of the drum ( 6 ) into a sheet guide position immediately after passing a first gripper system arranged on the sheet conveyor system ( 5 ), and before passing a Sheet conveying system ( 5 ) downstream of the second gripper system can be moved back to the basic position. 2. Delivery device according to claim 1, characterized in that the sheet guiding device ( 15 ) has a cross member ( 18 ) which is accommodated in bearings ( 17 ) on the frame side and on which at least one guide element ( 20 ) is arranged in the conveying direction ( 10 ), and that the cross member ( 18 ) can be pivoted about the axis of rotation in the pivoting direction ( 19 ) by means of a gear mechanism ( 21 , 22 ). 3. A delivery device according to claim 2, characterized in that a plurality of guide elements ( 20 ) are arranged at intervals on the cross member ( 18 ). 4. Delivery device according to claim 3, characterized in that the guide elements ( 20 ) are tongue-shaped. 5. Delivery device according to claim 3, characterized in that the guide elements ( 20 ) have a plurality of rollers rotatably mounted in the conveying direction ( 10 ). 6. Delivery device according to at least claim 1, characterized in that the sheet guiding device ( 15 ) having at least one guide element ( 20 ) is coupled to a pneumatic system for the blowing air operation. 7. A rigging device according to claim 2, characterized in that the gear mechanism ( 21 , 22 ) has a coupling ( 23 ) arranged on the cross member ( 18 ) and operatively connected to a ternary member ( 24 ), the ternary member ( 24 ) having a swivel joint ( 25 ) connected to the coupling ( 23 ), furthermore having a swivel joint ( 26 ) fixed to the frame and a swivel joint ( 27 ) which carries a spring-loaded cam roller ( 28 ) associated with a control cam ( 29 ). 8. Delivery device according to claim 1 and 2, characterized in that, in order to secure the basic position, the sheet guiding device ( 15 ) has a locking device ( 31 ) acting on the gear mechanism ( 21 , 22 ), preferably coupled to a central control. 9. Delivery device according to claim 8, characterized in that the locking device ( 31 ) has a roller lever ( 33 ) with the rotary joints ( 38 , 26 ), wherein a spring-loaded cam roller ( 32 ) is mounted in the rotary joint ( 38 ), which is paired with a control cam ( 42 ), and the roller lever ( 33 ) is mounted in the rotary joint ( 26 ) fixed to the frame, that a locking arm ( 34 ) is arranged on the end of the roller lever ( 33 ), to which a locking pawl ( 37 ) mounted in a rotary joint ( 39 ) fixed to the frame is assigned adjacently and the locking pawl ( 37 ) is coupled to an actuating device ( 36 ) fixed to the frame. 10. Delivery device according to claim 1, characterized in that the sheet guiding device (13) arranged downstream of the recess ( 43 ) in the conveying direction ( 10 ) is adjustable in length in or against the conveying direction ( 10 ).