EP1256533B1 - Sheet front edge separator - Google Patents

Abstract

Double suckers (1) have fixed horizontal sucker coupling (6) attached to them. Coupling is freely movable in guide (15) at end opposite to suckers. Guide is fixed to vertical rocker (9) with guide end section rotationally resting on fixed swivel axis (10). Roller (12) is freely rotationally resting on end of rocker opposite to axis (10). Suction coupling (6) is guided along tilting axis (8) of double suckers along curve contour. Suction coupling (6) is guided along tilting axis (8) of double suckers along curve contour. Curve contour overlays a further movement to the vertical and horizontal movement of the sucker coupling, which causes tilting of the lower suction surface of the suckers, so they are raised more at their front part in feed direction thus preventing tilting moment which could release sheet from suction surfaces.

Description

The invention relates to a Bogenvorderkantentrenner with several juxtaposed double suckers for cyclic promotion of bows, the double suckers by a Kurvenkoppelgetriebe indicated movements on a closed path in the conveying direction the bow and back run while doing the double suckers in one two work cycles having motion cycle to a power stroke one after the other moves into the area of the stack leading edge of a stack of sheets to capture a sheet from the pile of sheets, with a Suction coupling of the curve coupling gear, on which a double suction fixed is arranged, wherein the suction coupling with a first cam mechanism and a second cam mechanism is pivotally connected, so that the Double suction can be driven substantially vertically and horizontally movable is.

From US-A-2 060 800 a sheet leader separator is shown in the opening paragraph known type, but not double suction but simple vacuum cleaner has.

A Bogenvorderkantentrenner of the type mentioned is from the DE 42 20 399 A1 known. Since the cam gear of this known Bogenvorderkantentrenners only one vertical and one horizontal movement can generate, it comes in the lifting movement of the double suction to such a tilting of the double suction, that the lower suction surface Lower lifted at its end directed in the conveying direction is called the rear end in the conveying direction. Through this tilting movement is the lower suction surface opposite to the extension of the double suction Tilted on the bow pile drooping back arch part, so that the bow unintentionally easily detached from the double suction can. This danger is particularly great for rigid sheets such as cardboard then the bow with most of the weight of his over the pile of sheets opposite to the conveying direction extending rear area a releasing moment on the front of the double suction sucked Area exercises.

From DE 92 09 663 U a Bogenvorderkantentrenner is known at it is in the vertical lifting movement of the double suction to a Tilting movement of the double suction around a horizontally transversely to the sheet conveying direction extending tilt axis of the double suction comes.

From DE 842 349 C a Bogenvorderkantentrenner is known in which a Saugerkoppel means two crank gears along a curve contour is guided, wherein the curve contour is a tilting movement of the double suction around a horizontally extending transversely to the sheet conveying direction Tilting axis of the double suction intended.

The CH 120 823 A is a tilting device for the suction rod of pneumatic sheet feeders known in which a push rod for the reciprocating movement of the nipple rod and a tilting the sucker causing further push rod is present. The Push rods are so articulated and adjustable by an intermediate member interconnected, that the size of the tilt angle through the Moving the point of the further push rod on the intermediate link is adjustable.

The object of the invention is a Bogenvorderkantentrenner the beginning to create said type, with a simple structure an at least largely vertical lifting of the double suction at the same time defines a stronger lift in the forward direction of his lower suction surface opposite the rear area allows.

This object is achieved in that the double suction from the first cam gear substantially horizontally and is driven by the second cam mechanism substantially vertically, wherein the two cam gears a vertical lifting of the double suction make sure and that the nipple coupling along a tilting movement of the double suction to a horizontally across the sheet conveying direction extending tilt axis of the double suction determining Curve contour is performed, the curve contour such a tilting of the lower suction surface of the double suction causes this on her in Sheet conveying direction front area is raised more than at her rear area.

The two cam gears represent the vertical lifting of the Double suckers and thus a flawless overlay of the sheet leading edge over a scraper usually resting on the stack leading edge for sure.

By the curve contour of the vertical and horizontal movement of Suction pad superimposed on another movement that such a tilting the lower suction surface of the double suction causes this to its in Conveying direction front area is raised more than at its rear Area. Thus, the inclination of the lower suction surface corresponds to Double suckers the extension of the double suckers to the rear Area of the arch. A tilting moment acting on the bow, that for releasing the sheet from the suction surface of the double suction could lead to it is avoided.

By choosing the course of the curve contour, the course of the Tilting movement are determined.

In a simple embodiment, the curve contour may form part of the first Be cam gear.

The first cam gear can be a substantially horizontal have horizontal and horizontally movable drivable horizontal coupling, which is hinged at one end to the suction cup, wherein Advantageously, the pivot axis of the articulation of the horizontal coupling at the suction coupling forms the tilting axis.

To generate the horizontal movement, the first cam gear have a substantially vertically extending rocker, the pivotally mounted at its one end about a fixed pivot axis is and pivotable by a rotatably driven cam is drivable, wherein the horizontal coupling with their double suckers opposite end portion at a distance to the first Swivel axis is hinged to the swingarm.

Is on the rocker a roller freely rotatably mounted, with its radial circumferential circumferential surface on the radial circumferential contour of the cam in abutment, so a reduction in friction is achieved.

To reduce the moving parts, the curve contour can be fixed be connected to the rocker, preferably the curve contour extends approximately radially away from the pivot axis.

If the contour of the curve is a guide in which the end region of the suction coupling opposite the double suction device is guided so that it can move freely, a movement transfer from the curve contour to the suction coupling takes place in a simple manner.
To generate the vertical movement, in a simple embodiment, the second cam gear has a substantially vertically extending coupling, which is driven by a second rotatably driven cam approximately vertically movable.

In this case, the coupling can be articulated with its one end to the suction coupling and at the other end of the second cam approximately be acted upon vertically movable.

To reduce the friction is advantageously at the coupling a second roller freely rotatably mounted, with its radially circumferential surface on the radial circumferential contour of the second cam in plant is.

To about vertically freely movable guidance of the coupling is simple Make one with its one end free to a second fixed pivot axis pivoting roller rocker hinged at its other end to the coupling.

To keep deviations from the vertical guide low, it is preferable the roller rocker near the second cam at the paddock hinged.

Another vertical guide may also be that the coupling articulated at one end to the nipple coupling and at its second End of a double-armed swingarm about vertically movable can be acted upon, the two-armed rocker to a second fixed Swivel axis is freely pivoting, with the free end of her one Swing arm articulated at the second end of the coupling and on a the free end of its second swing arm freely rotatably mounted second roller on the radially encircling contour of the cam of second cam gear is in plant.

Another way of vertical guidance is that the Coupling performed in an axial guide approximately in the direction of its longitudinal axis is.

A particularly low-component construction and a particularly small installation space is achieved when the first and second cam on a common rotatably driven drive shaft are rotatably disposed.

Figur 1

eine schematische Seitenansicht eines Bogenvorderkantentrenners

Figur 2a-2f

die Bewegungsphasen der Doppelsauger des Bogenvorderkantentrenners nach Figur 1

Figur 3

eine schematische Seitenansicht eines zweiten Ausführungsbeispiels eines Bogenvorderkantentrenners.

An embodiment of the invention is illustrated in the drawing and will be described in more detail below. Show it

FIG. 1

a schematic side view of a Bogenvorderkantentrenners

FIGS. 2a-2f

the movement phases of the double suckers of the sheet leading edge separator according to FIG. 1

FIG. 3

a schematic side view of a second embodiment of a Bogenvorderkantentrenners.

The illustrated Bogenvorderkantentrenner consists of at least two spaced apart units, such as one in FIG 1 and Figure 3 is shown.

These units each have a double suction 1 and 1 'on which a substantially horizontally extending suction coupling 6 fixed is arranged.

The suction coupling 6 is opposite to her the double suction 1 End guided in a guide 15 a curve contour freely movable. The Guide 15 is fixed with a substantially vertically extending Swingarm 9 connected, with its one end to a fixed Pivot axis 10 is pivotally mounted, wherein the guide 15 is approximately extends radially away from the pivot axis 10.

At the pivot axis 10 opposite end is at the Rocker 9 a roller 12 freely rotatably mounted, with its radially encircling Jacket surface 13 on the radially circumferential contour 14 a cam 11 of a first cam gear is in plant. For safe investment the roller 12 on the cam 11, the rocker 9 is corresponding acted upon by a spring 24.

The first cam gear further forms a substantially horizontal extending horizontal coupling 7, with one end to the Saugerkoppel 6 near the double aspirator 1 and with its other end in the middle range of the rocker 9 is articulated and for the horizontal Movement drive of the double suction 1 ensures.

The pivot axis of the articulation of the horizontal coupling 7 on the suction coupling 16 simultaneously forms a tilting axis 8, around which the suction coupling 6 upon movement of the double suckers 1 opposite end in the Guide 15 can pivot and so a tilting movement of the double suction 1 causes.

By rotatably driven in a power stroke drive shafts 23 of the Cam 11 are the rocker 9 and with it the horizontal coupling 7, the suction coupling 6 and the double suction 1 substantially horizontally movable drivable.

In the embodiment of Figure 1 is approximately in the central region of Suction coupling 6 hinged a coupling 16, which is substantially vertical extends downwards and facing away from the suction coupling 6 at her Ends a freely rotatably mounted second roller 18 carries. This role is 18 with its radially encircling lateral surface 19 on the radially encircling Contour 20 of a cam 17 of a second cam gear in Appendix, wherein the second cam 17 adjacent to the first cam 11 is also arranged rotatably on the drive shaft 23 and the Coupling 16 and with her the suction pad 6 and the double suction 1 in essentially vertically movable drives. For safe installation of the roller 18 at the contour 20 of the cam 17, the coupling 16 is corresponding acted upon by a spring 25.

In the region of the axis of rotation of the second roller 18 which is one end of a Roller rocker 22 hinged to the coupling 16, wherein the other end the roller rocker 22 about a second fixed pivot axis 21 free is pivotally mounted.

In the embodiment of Figure 3 is also the coupling 16 with hinged her one end to the suction coupling 6, wherein the coupling 16 extends substantially vertically downwards. At her second end is the coupling 16 of a double-armed rocker 29 about vertically movable acted upon, the double-arm rocker 29 to a second fixed pivot axis 21 is freely pivotable. With the free end her one swinging arm 30 is the double-armed rocker 29 am hinged second end of the coupling 16 and one at the free end the second swing arm 31 freely rotatably mounted second roller 18 'on the radially circumferential contour 20 of the cam 17 of the second Cam mechanism by a spring 25 'applied held in abutment.

The first cam 11 and second cam 17 of the two arranged side by side units of the same construction, as in Figure 1 and Figure 3, are arranged offset by 180 ° to each other. This results in that within a cycle of movement involving two working cycles of Bogenvorderkantentrenners the double suction 1 first with its lower suction surface 26, the uppermost sheet 2 in the area the stack leading edge 4 of a sheet stack 5 detected and at least largely vertically raises. By guided in the guide 15 Saugerkoppel while the double suction 1 is tilted so that its lower Suction surface 26 from its parallel to the surface of the sheet stack 5 position pivoted in a forward direction higher than the rear in the conveying direction 3 becomes. In this case, the suction surface 26 fits about the natural extent course with his back still on the sheet pile 5 down hanging sheet 2, which causes the sheet 2 safer is held by the double suckers and not unintentionally by the suction surface 26 dissolves.

In the raised state of the sheet passes the upper suction surface 27 of the double suction 1 in a plane in which also the one another Sheet 2 'carrying the lower suction surface 26' of the double suction 1 'is located. This arc 2 'is now from the upper suction surface 27 of the double suction 1 taken over.

The at its upper suction surface 27 'already a third sheet 2 "bearing Double suction 1 'now moves in the direction 3 to a bath table 28 and hands this bow 2 ".

At the same time, the double suction device 1 moves over the front area of the sheet pile 5 up, so that the double suction 1 'then under the from the double suction 1 raised sheet 2 on the sheet stack. 5 move and another sheet 2 "'can capture.

Now performs the double suction 1 'the beginning of the double suction 1 described lifting movement, while the double suction 1, the beginning described movement of the double suction 1 'performs.

LIST OF REFERENCE NUMBERS

1, 1 '

Doppelsauger

2, 2 ', 2 ", 2 ''

bow

3

conveying direction

4

Stack front edge

5

sheet pile

6

suction coupling

7

Horizontal coupling

8th

tilt axis

9

first swingarm

10

first pivot axis

11

first cam

12

first role

13

Lateral surface first roll

14

Contour first cam

15

guide

16

paddock

17

second cam

18, 18 '

second role

19

Lateral surface second roll

20

Contour second cam

21

second pivot axis

22

role rocker

23

drive shaft

24

feather

25, 25 '

feather

26

lower suction surface

27

upper suction surface

28

belt table

29

double-armed swingarm

30

first swing arm

31

second swing arm

Claims (17)

1. Sheet leading edge separator comprising a plurality of double suckers arranged beside one another for the cyclic delivery of sheets, the double suckers executing movements driven by a cam coupler mechanism on a closed path in the delivery direction of the sheets and back and, in the process, the double suckers, in a movement cycle having two operating cycles, coming one after another, offset by one operating cycle, into the region of the stack front edge of a sheet stack in order to grip a sheet of the sheet stack, comprising a suction coupler which belongs to the cam coupler mechanism, on which a double sucker is arranged in a fixed manner, the suction coupler being connected in an articulated manner to a first cam mechanism and a second cam mechanism, so that the double sucker can be driven so as to move substantially vertically and horizontally, characterized in that the double sucker (1) can be driven substantially horizontally by the first cam mechanism and substantially vertically by the second cam mechanism, the two cam mechanisms ensuring vertical lifting of the double sucker (1), and in that the suction coupler (6) is guided along a cam contour that determines a tilting movement of the double sucker (1) about a tilt axis of the double sucker (1) which extends horizontally transversely with respect to the sheet conveying direction (3), the cam contour effecting tilting of the lower suction surface (26) of the double sucker (1) such that the latter is raised to a greater extent in its front region in the sheet conveying direction (3) than in its rear region.
2. Sheet leading edge separator according to Claim 1, characterized in that the cam contour is a constituent part of the first cam mechanism.
3. Sheet leading edge separator according to one of the preceding claims, characterized in that the first cam mechanism has a horizontal coupler (7) which extends substantially horizontally and can be driven so as to move horizontally and which is attached by its one end to the suction coupler (6).
4. Sheet leading edge separator according to Claim 3, characterized in that the pivot axis of the attachment of the horizontal coupler (7) to the suction coupler (6) forms the tilt axis (8).
5. Sheet leading edge separator according to either of Claims 3 and 4, characterized in that the first cam mechanism has a swinging arm (9) which extends substantially vertically, which is mounted in its one end region such that it can pivot about a fixed pivot axis (10) and which can be driven so as to pivot by a cam disc (11) which can be driven in rotation, the horizontal coupler (7) being attached to the swinging arm (9) with its end region opposite the double sucker (1), at a distance from the first pivot axis (10).
6. Sheet leading edge separator according to Claim 5, characterized in that a roller (12) is mounted on the swinging arm (9) such that it can rotate freely and is in contact with its radially circumferential outer surface (13) on the radially circumferential contour (14) of the cam disc (11).
7. Sheet leading edge separator according to either of Claims 5 and 6, characterized in that the cam contour is firmly connected to the swinging arm (9).
8. Sheet leading edge separator according to Claim 7, characterized in that the cam contour extends approximately radially away from the pivot axis (10).
9. Sheet leading edge separator according to one of the preceding claims, characterized in that the cam contour is a guide (15), in which the end region of the suction coupler (6) opposite to the double sucker (1) is guided such that it can move freely.
10. Sheet leading edge separator according to one of Claims 5 to 9, characterized in that the second cam mechanism has a coupler (16) which extends substantially vertically and can be driven so as to move approximately vertically by a second cam disc (17) which can be driven in rotation.
11. Sheet leading edge separator according to Claim 10, characterized in that the coupler (16) is attached by its one end to the suction coupler (6) and, at its other end, can be acted on by the second cam disc (17) so as to move approximately vertically.
12. Sheet leading edge separator according to Claim 11, characterized in that a second roller (18) is mounted on the coupler (16) such that it can rotate freely and is in contact with its radially circumferential outer surface (19) on the radially circumferential contour (20) of the second cam disc (17).
13. Sheet leading edge separator according to either of Claims 11 and 12, characterized in that a roller swinging arm (22) that can be pivoted freely by its one end around a second fixed pivot axis (21) is attached by its other end to the coupler (16).
14. Sheet leading edge separator according to Claim 13, characterized in that the roller swinging arm (22) is attached to the coupler (16) close to the second cam disc (17).
15. Sheet leading edge separator according to Claim 10, characterized in that the coupler (16) is attached by its one end to the suction coupler (6) and at its second end can be acted on by a double-arm swinging arm (29) so as to move approximately vertically, it being possible for the double-armed swinging arm (29) to pivot freely about a second fixed pivot axis (21), being attached by the free end of its one swinging arm (30) to the second end of the coupler (16) and, via a second roller (18') that is mounted at the free end of its second swinging arm (31) such that it can rotate freely, being in contact with the radially circumferential contour (20) of the cam disc (17) of the second cam mechanism.
16. Sheet leading edge separator according to one of Claims 10 to 12, characterized in that the coupler is guided in an axial guide approximately in the direction of its longitudinal axis.
17. Sheet leading edge separator according to one of Claims 10 to 16, characterized in that the first and second cam discs (11, 17) are arranged fixed on a common drive shaft (15) that can be driven in rotation, so as to rotate with it.

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