EP1712499B1 - Cylinder pertaining to a folder, comprising a cylinder body and at least one gripper - Google Patents

Abstract

Cylinder (01) has axes (21, 24) arranged so that they are fixed in relation to the cylinder. Preferred Features: The first axis (21) is supported by a first arm (19) which pivots about the second axis fixed to the cylinder body to drive the radial inward movement of the first axis. The pivoting movement of a gripping device (02) and the radial movement of the first axis are coupled so that the first axis move radially inward in the end phase of the pivoting movement.

Description

The invention relates to a cylinder of a folding apparatus with a cylinder body and at least one gripper according to the preamble of claim 1.

Such a gripper cylinder carries on its lateral surface one or more grippers which are movable between a position in which they hold a leading end of a piece of flat material to be conveyed on the gripper cylinder against the lateral surface, and a release position in which the flat material of the Cylinder can solve again or a new piece of flat material can be picked up and pinched. In general, the grippers pivot between these two positions. Since the time periods available for clamping or releasing a product are short, the pivoting motion must be at high speed, and the amplitude of movement between the clamping position and the release position of the gripper should be as small as possible in order to limit materially straining strong accelerations hold.

In order to avoid damaging a trailing end of a piece of sheet held by a gripper on the cylinder by the movement of a gripper following in the circumferential direction on the cylinder when clamping a subsequent piece of sheet material, most gripper cylinders are designed to receive pieces of flat stock which respectively face the gripper cylinder be supplied spaced so that the flat pieces of material in each case create a gap between successive pieces of the gripper cylinder and the gripper can move in the gap, without touching the respective preceding piece. If these flat pieces of material are prepared beforehand by cutting off a continuous strand, then the cut pieces to produce such a gap, to be accelerated to a speed higher than that of the strand before cutting. However, if a conveyor system that continues to convey the cut products from the strand after cutting, runs faster than the supplied strand, this leads to slippage and thus friction between the conveyor system and a leading section of the strand penetrating therein prior to cutting necessarily still moved with the original speed of the strand. For flat material with a delicate surface such as fresh printed matter, this friction can affect the quality of the surface, for example, by abrasive marks on the substrate or blurring of paint. Moreover, if the pieces of flat material are composed of a stack of mutually unconnected sheets, the problem arises that different friction on the different sides of the stack can result in the sheets being displaced relative to each other and the pile being pulled apart, significantly increasing further processing of the stack difficult.

It is particularly problematic when the flat material pieces are cut off immediately in contact with the gripper cylinder from the strand, for example by a rotating knife cylinder, which together with the gripper cylinder defines a cutting gap and cooperating with an abutment of the gripper cylinder severed the strand. In order for the strand to be cut to bear evenly against the surface of the gripper cylinder, the grippers must be able to dive into the interior of the gripper cylinder. After a piece of flat material has been cut from the supplied strand, only a very short time is available to grasp the newly formed leading edge of the strand with a gripper and press against the surface of the cylinder. However, the path between the retracted position of the gripper and the extended, the flat material against the cylinder oppressive position is long and requires a high speed of the gripper movement, which can be realized only with a high-quality, expensive drive mechanism. Furthermore is the wear, and thus the susceptibility of the drive mechanism to greater, the higher their operating speed.

Out EP 0 931 748 B1 and the DE 198 57 507 A1 a gripper cylinder is known, which is able to deliver separated from a supplied strand printed products without lead, that is without spacing between the successive printed products. In this gripper cylinder, a gripper is mounted on a shaft rotatably mounted in the cylinder via a translation mechanism that drives the gripper coupled to the pivoting movement to a parallel displacement. This translational mechanism serves to move the gripper between its retracted position and a projecting position over the lateral surface of the cylinder, out of which it can be pivoted about the shaft to press the leading edge of a string of printed products against the cylinder surface.

The DE 100 60 713 A1 , the US Pat. No. 6,093,139 and the US 953 063 A each describe a folding apparatus with a gripper cylinder, which has a cutting strip for a cutting blade of a cooperating with the gripper cylinder cutting knife cylinder. The grippers of the gripper cylinder are pivotable about a first movable axis for clamping the material to be transported. This first axis is in turn mounted on a pivotable about a cylinder-fixed, second axis lever. This lever is controlled by means of a first cam to produce a movement of the gripper in the circumferential direction. A second cam controls the clamping movement of the gripper.

The DE 102 03 059 A1 discloses a transport cylinder for printing material sheet with a gripper. The gripper is movable by means of two fixed pivot axes and a further pivotable about one of the cylinder fixed pivot axes pivot axis. To control only one cam is provided.

The US 5 429 578 A and the US 5 004 451 A show folding blades that act to guide products with tapes together.

The invention has for its object to provide a cylinder of a folder with a cylinder body and at least one gripper.

The object is achieved by the features of claim 1.

Out again EP 0 931 748 B1 Known gripper cylinder uses the present gripper cylinder to shorten the movement between the retracted position and the clamping position of the gripper in addition to the pivotal movement a translational movement, but with the difference that a translation driving mechanism is not pivotable together with the gripper about the pivot axis and so its moment of inertia increases, but shifts the axis of the gripper as such in the radial direction. Since the radial stroke required for clamping or releasing the flat material on the gripper cylinder is small in comparison to the required amplitude of movement of the gripper in the circumferential direction, a small amplitude of the radial displacement movement is sufficient, which can be generated with low energy consumption and low stress of the mechanical components.

When the sheet to be clamped by the gripper is a stack of sheets, it is desirable to avoid, at the moment of clamping the stack, a movement component of the gripper in the circumferential direction of the cylinder, so that the stack is not subjected to shearing forces. While conventionally the clamping is achieved only by a pivoting movement of the gripper and thus the exercise of a shear force on a stack of sheets during clamping is unavoidable, it is preferably provided in the present gripper cylinder, that in a final phase of the pivoting movement into the clamping position, the first axis radially moved inwards.

A simple and robust way to drive the radial inward movement of the first axis is to mount it to a first arm which is pivotable about a second axis fixed relative to the cylinder body so that the radial movement of the first axis is pivotal about that first axis Poor corresponds.

This pivotal movement of the first arm can, as conventionally, the pivoting movement of the gripper itself, be driven in a simple manner by a cam which does not rotate together with the gripper cylinder and whose shape is scanned by a lever connected to the first arm.

In order to drive the pivoting movement of the gripper between the retracted position and the clamping position, a coupling rod is provided which is articulated on the one hand to the gripper and on the other hand to a second arm pivotable about a third axis. Its pivoting movement can also be driven by a cam, as indicated above.

In a space-saving arrangement, the second and third axes are on opposite sides of the gripper with respect to the circumferential direction of the cylinder.

Of the two arms, the first is oriented more in the circumferential direction and the second more in the radial direction of the cylinder body, in other words, the orientation of the first arm is closer to the circumferential direction than that of the second, and that of the second is closer to the radial one Direction than that of the first.

On the cylinder body, each gripper is associated with an abutment which, in cooperation with a knife moved together with the gripper cylinder, serves for cutting material supplied by the gripper cylinder and to be gripped by the gripper.

Relative to the direction of rotation of such a gripper cylinder, the gripper is disposed in front of its associated abutment, and the surface portion of the gripper cylinder against which the gripper presses cut sheet material is preferably its abutment itself, the elasticity of which thus aids both the cutting operation and gripping.

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

Fig. 1

eine schematische Darstellung eines Querfalzapparates, der einen Greiferzylinder verwendet;

Fig. 2

einen vergrößerten Teilschnitt durch den Greiferzylinder, der den Greifer in seiner versenkten Stellung zeigt;

Fig. 3

einen Teilschnitt analog dem der Fig. 2, der den Greifer während des Ausfahrens aus der versenkten Stellung zeigt;

Fig. 4

einen Teilschnitt, der den Greifer in der Klemmstellung zeigt;

Fig. 5

einen Teilschnitt, der den Greifer auf dem Rückweg in die versenkte Stellung zeigt;

Fig. 6

eine schematische Darstellung entsprechend Fig. 2;

Fig. 7

eine schematische Darstellung entsprechend Fig. 4;

Fig. 8

eine schematische Darstellung entsprechend Fig. 5;

Fig. 9

eine schematische Darstellung entsprechend Fig. 1;

Fig. 10

eine schematische Draufsicht eines Greiferzylinders.

Show it:

Fig. 1

a schematic representation of a Querfalzapparates using a gripper cylinder;

Fig. 2

an enlarged partial section through the gripper cylinder, showing the gripper in its retracted position;

Fig. 3

a partial section similar to that of Figure 2, showing the gripper during extension from the retracted position.

Fig. 4

a partial section showing the gripper in the clamping position;

Fig. 5

a partial section showing the gripper on the way back in the lowered position;

Fig. 6

a schematic representation corresponding to FIG. 2;

Fig. 7

a schematic representation corresponding to Fig. 4;

Fig. 8

a schematic representation corresponding to FIG. 5;

Fig. 9

a schematic representation corresponding to FIG. 1;

Fig. 10

a schematic plan view of a gripper cylinder.

Fig. 1 shows a highly schematic section through a folder, z. B. a web-fed rotary printing press according to the present invention. The folder comprises a cylinder 01, z. B. a gripper cylinder 01, which is equipped in the example shown here with five circumferentially uniformly distributed grippers 02 and folding blades 03. In the axial direction of the cylinder 01 are preferably a plurality of these grippers 02, z. B. individually sprung arranged. The gripper cylinder 01, together with a knife cylinder 04, here with two knives 06, a cutting gap 09, in which a fed flat material 07, z. B. a strand 07, which generally consists of a plurality of superimposed printed material webs, for. B. paper webs is composed in single sheet 08, z. B. individual printed products 08 is disassembled from each one printed page of appropriate length.

During the passage through the cutting gap 09, the gripper 02 and the folding blade 03 are sunk inside the gripper cylinder 01. The peripheral speed of the gripper cylinder 01 corresponds exactly to the feed speed of the strand 07, so that the printed products 08 cut off from the strand 07 follow one another without gaps on the circumference of the gripper cylinder 01, ie. H. between the underlying material web and bale of the gripper cylinder 01 is no relative movement.

"Exactly" and "not" is to be understood in a technical sense, meaning that possibly negligible small tolerances can occur.

After passing through the cutting gap 09, the grippers 02 are each below of the trailing portion 11 of one of the printed products 08 extended out of the gripper cylinder 01 and pivoted counter to the direction of rotation to each clamp the leading edge 12 of the strand 07 on the surface of the gripper cylinder 01. The trailing portions 11 of each printed product 08 are so spread a little way from the surface of the gripper cylinder 01, but this does not affect the uniform winding of the strand 07 on the gripper cylinder 01, since they are spread apart only after cutting off the gripper cylinder 01.

The gripper cylinder 01 forms a folding gap 13 with a jaw cylinder 14. During the passage through the folding gap 13, the folding blades 03 extend from the gripper cylinder 01 to insert the printed products 08 along a center line in (not shown) jaws of the jaw cylinder 14. The cross-folded in this way printed products 08 are transported on the jaw cylinder 14 to a point where they are passed, for example, to a (not shown) paddle wheel for laying on a conveyor belt.

Fig. 2 shows in a partial section transverse to the axis of the gripper cylinder 01 a gripper 02 and its surroundings. The gripper 02 comprises a support beam 16 which extends over the entire usable width of the gripper cylinder 01 and carries on a radially outwardly directed side a double-L or Z-profile 17 of an elastic material such as spring steel, which is used for clamping the Printed products 08 is extendable. The profile 17 may extend continuously in the axial direction of the gripper cylinder 01 or be divided into a plurality of spaced-apart in the axial direction tines, each of which is engaged by an opening in the shell of the gripper cylinder 01.

The support beam 16 is hinged on the one hand to a first arm 19, which is fixedly connected to a rotatably mounted in the gripper cylinder 01, ie zylinderortsfesten shaft 21. The first arm 19 extends approximately parallel to the lateral surface of the gripper cylinder 01. The support beam 16 is also a relative to the gripper cylinder 01 pivotable swivel axis 28 hinged to a coupling rod 22, which is also aligned approximately parallel to the lateral surface of the gripper cylinder 01 and in turn via a relative to the gripper cylinder 01 spatially adjustable pivot axis 29 is hinged to an approximately radially oriented second arm 23. This second arm 23 is fixedly connected to a shaft 24 which is rotatably mounted in the gripper cylinder 01. The rotational position of the two arms 19; 23, as shown in Figures 6, 7 and 8 shown on two cams 31; 32 fixed, which do not rotate together with the gripper cylinder 01 and each of a roller 33; 34 are scanned, each having an arm 36; 37 is connected to the shaft 21 and 24, respectively.

The rollers 33; 34 are preferably sprung to the cams 31; 32 pressed, in particular by a torsion bar spring. The cams 31; 32 are arranged offset in the axial direction.

It is easy to understand with reference to FIG. 2 that a rotation of the arm 19 about the shaft 21 substantially causes a radial inward or outward movement of the gripper 02, and possibly to a lesser extent a pivotal movement of the gripper 02 about the axis 27, on the the support beam 16 and the first arm 19 are hinged together. On the other hand, rotation of the shaft 24 would drive a pivotal movement of the gripper 2 about the axis 27 - assuming a fixed shaft 21.

About the two cams 31; 32 is therefore a two-stage movement possible. The cams 31; 32 cause the pivoting movement and the clamping movements of the gripper 02 can each be made substantially independently of each other.

The gripper cylinder 01 shown in detail in FIG. 2 rotates counterclockwise. Clockwise behind the profile 17 receiving opening of the cylinder jacket in this a hard rubber strip is embedded, the surface portion 26 of the z. B. as extending in the axial direction abutment 26 for the knives 06 of the knife cylinder 04th when cutting the strand 07 is used. The gripper 02 is arranged in the direction of movement of the cylinder 01 immediately before the abutment 26 for cutting. The distance a of a tip of the gripper 02 is in the retracted state and an edge of the abutment 26 is less than 30 mm, in particular less than 10 mm. In the configuration shown in Fig. 2, in which the gripper 02 is sunk into the interior of the gripper cylinder 01, the gripper 02 can pass the cutting gap 09, wherein the strand 07 (not shown in Fig. 2) is severed at the level of the abutment 26 , In order to grip the resulting leading edge 12 of the strand 07 and to press against the abutment 26, the gripper 02 is extended from the gripper cylinder 01.

Fig. 3 shows an intermediate position during extension. As can be seen, between the configurations of Figs. 2 and 3, the shaft 21 has rotated significantly counterclockwise, whereby the axis 27 has been displaced radially outwards and the profile 17 of the gripper has emerged from the opening of the cylinder jacket. By a slight clockwise rotation of the shaft 24, the gripper 02 is also pivoted clockwise about the axis 27, so that the tip of the free leg 18 of the profile 17 is radially above the abutment 26.

By a rotation of the shaft 21 in the clockwise direction, as shown in Fig. 4, the axis 27 of the gripper 02 is again moved radially into the interior of the gripper cylinder 01 so that the free end of the profile 17 is lowered to the abutment 26 and the between itself and the abutment 26 lying leading end of the strand 07 (not shown in the figure) clamped.

After the passage of the gripper 02 through the folding gap 13 of the gripper 02 is raised by a rotation of the shaft 21 in the counterclockwise direction again and released between the free end and the abutment 26 clamped printed matter 08, as shown in Fig. 5. From this stage, the shaft 24 pivots counterclockwise to the free leg 18 of the gripper 02 on the abutment 26th away and over the opening of the cylinder jacket. By a subsequent rotation of the shaft 21 in a clockwise direction of the gripper 02 is again withdrawn into the interior of the gripper cylinder 01, in the position shown in Fig. 2. The gripper 02 is now ready for another passage through the cutting gap 09.

As you can see, a small swing angle of the gripper 02 is sufficient to move it between the clamping position and the retracted position, and also the radial stroke is limited - depending on the thickness of the processed printed products 06 - to a few millimeters. Since the gripper 02 can be simple in construction, its weight and moment of inertia are low. The short strokes between sunk position and clamping position of the gripper 02 require low accelerations and thus moderate, material-friendly driving forces.

Fig. 9 shows a gripper cylinder 01 with three gripper systems 02, z. B. grippers 02, wherein located in the region of the knife cylinder 04 gripper system 02 in retracted position, d. H. in the cutting position located in the area between the knife cylinder 04 and jaw cylinder 14 located gripper system 02 in the closed position, d. H. Clamping position and arranged after the jaw cylinder 14 gripper system 02 in the open position, d. H. in release position.

Between knife cylinder 04 and jaw cylinder 14 may also be arranged a band guide. These bands press the cut off printed matter 06, d. H. the signatures against the lateral surface of the gripper cylinder 02. In the axial direction a plurality of bands are arranged at a distance, so that the gripper 02 can run trouble-free at these intervals.

The tape guide can each be driven by the gripper cylinder 01 or the jaw cylinder 14. The band guide can also be driven by friction or by a separate motor.

10 shows a schematic plan view of a gripper system 02.

LIST OF REFERENCE NUMBERS

01

Cylinder, gripper cylinder

02

Gripper system, gripper

03

folding blade

04

diameter cylinder

05

-

06

knife

07

Flat material, strand

08

Flat material, printed matter

09

cutting gap

10

-

11

Section, lagging

12

Edge, leading

13

folding gap

14

jaw cylinder

15

-

16

beams

17

profile

18

leg

19

poor

20

-

21

wave

22

coupling rod

23

poor

24

wave

25

-

26

Surface section, abutment

27

axis

28

swivel axis

29

swivel axis

30

-

31

cam

32

cam

33

caster

34

caster

35

-

36

poor

37

poor

a

distance

Claims (8)

1. A cylinder (01) of a folder with a cylinder body, at least one gripper (02) which is movable between a position recessed in the interior of the cylinder body, an extended position and a clamping position, wherein in the clamping position a tip of the gripper (02) presses flat material (07; 08) from outside against a surface portion (26) of the cylinder body, and wherein an axle (21) is provided about which the gripper (02) performs a pivoting movement between the recessed and the extended positions, wherein an abutment (26) for cutting flat material (07; 08) to be gripped by the gripper (02) is associated with the gripper (02) on the cylinder body, wherein the gripper (02) is arranged in front of the abutment (26) associated with it in relation to the direction of rotation of the gripper cylinder (01), wherein another axle (24) is provided which is different from an axis of rotation of the cylinder (01) and about which the gripper (02) performs a movement in the peripheral direction of the cylinder (01), characterized in that at least one belt is provided which co-operates with the cylinder (01) at least in part in the region between a blade cylinder (04) and a folding-jaw cylinder (14), and a distance (a) between a tip of the gripper (02) in the recessed state and an edge of the abutment (26) is less than 30 mm, and in particular less than 10 mm.
2. A cylinder according to Claim 1, characterized in that a first axle (27) is carried by a first arm (19) which is pivotable about the second axle (21) stationary with respect to the cylinder body, in order to drive the radial inward movement of the first axle (27).
3. A cylinder according to Claim 2, characterized in that the pivoting movement of the gripper (02) and the radial movement of the first axle (27) are coupled in such a way that the first axle (27) moves radially inwards in an end phase of the pivoting movement into the clamping position.
4. A cylinder according to Claim 2, characterized in that a pivoting movement of the first arm (19) is driven with the aid of a cam disc (31).
5. A cylinder according to any one of the preceding Claims, characterized in that a coupling rod (22) is articulated at one end to the gripper (02) and at the other end to a second arm (23) pivotable about a third axle (24), in order to drive the pivoting movement of the gripper (02).
6. A cylinder according to Claim 5, characterized in that a pivoting movement of the second arm (23) is driven with the aid of a cam disc (32).
7. A cylinder according to Claim 5, characterized in that of the two arms (19; 23) the first arm (19) is, if anything, orientated in the peripheral direction and the second arm (23) is, if anything, orientated in the radial direction of the cylinder body.
8. A cylinder according to Claim 1, characterized in that the cylinder (01) is constructed in the form of a folding-jaw cylinder.

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