DE202016107280U1 - Accelerator for accelerating signatures - Google Patents

Abstract

Acceleration device for accelerating or decelerating sheets or signatures (4) or for tearing off sheets or signatures (4) of webs or strands, wherein the accelerating device (2) is rotatable about an axis of rotation (5), and wherein the accelerating device (2) at least one effective segment (10) formed as a cylinder segment and at least one retaining segment (13), and wherein the at least one active segment (10) has an effective surface (11) formed approximately as a cylindrical lateral surface which is operatively connected to an accelerating segment (11) or arc or signature (4) to be delayed, wherein the at least one approximately cylinder jacket-shaped active surface (11) has at least one effective radius (Rw) projected onto an end face (12) perpendicular to the rotation axis (5), and wherein each active surface ( 11) is delimited by two circular radii (W) projected onto the end face (12), and wherein d ie the two circular radii (W) per effective area (11) include the effective angle (αw), and wherein the holding segment (13) has an almost arbitrary holding segment contour (14) projected onto the end face (12) perpendicular to the axis of rotation (5), wherein the retaining segment contour (14) projected onto the end face (12) lies within a circle defined by the effective radius (Rw), and wherein the retaining segment contour (14) extends parallel to the axis of rotation (5) a retaining segment Spans lateral surface (15), characterized in that at least one of the transitions between each active surface (11) and at both ends of the active surface (11) adjacent retaining segment lateral surfaces (15) with a rotation axis (5) parallel rounding lateral surface (16) rounded or chamfered with a chamfer surface (17).

Description

The invention relates to an accelerating device for accelerating or decelerating sheets or signatures or for tearing off sheets or signatures of webs or strands, wherein the accelerating device is rotatable about an axis of rotation, and wherein the accelerating device of at least one formed as a cylinder segment operating segment and at least a retaining segment, and wherein the at least one active segment has an approximately designed as a cylindrical lateral surface active surface, which is in operative connection with an accelerating or to be retarded bow or signature, wherein the at least one approximately cylinder jacket-shaped effective surface at least one perpendicular to the axis of rotation having standing end face projected effective radius, and wherein each active surface is limited by two projected on the end face circular radii and wherein the two circular radii per effective area the effective angle and wherein the retaining segment has an almost arbitrary retaining segment contour projected onto the end face perpendicular to the axis of rotation, wherein the retaining segment contour projected onto the end face lies within a circle defined by the effective radius, and wherein the retaining segment Contour in extension parallel to the axis of rotation spans a holding segment lateral surface. Furthermore, the invention relates to a product slowdown device comprising a counter roll.

Especially in folders for folding sheets or sheet-like signatures, which are separated in the case of a folder of a web press before folding of one or more incoming sheets or strands, an acceleration of the signatures is often required. The acceleration of the signature can be carried out as a positive acceleration, as occurs for example for tearing off sheets or signatures in so-called tear-off perforations. In such a device, the incoming web or the incoming strand is not cut with a cut transverse to the direction, but here the web or the strand is perforated at the separation point, the actual separation is carried out by positive acceleration of the signature to be separated, which are usually narrow Webs of the perforation are severed.

However, the acceleration of the signature can also be carried out as a negative acceleration, so that with it sheets or in particular signatures are delayed in order to reduce their transport speed. Such delays in terms of a negative acceleration are used, for example, in folders of web presses, for example, to reduce the speed of the signatures before feeding to a second Längsfalzstation, which is also known as Schwertfalzeinrichtung.

In such product slowdown devices, the signature to be braked passes through a nip which is present between a mating roll and an accelerator device and is usually adjusted to the corresponding signature thickness. The signature enters the product slowdown device at a first rate and contacts the mating roll. The accelerator rotates at a peripheral speed which is approximately equal to the second speed of the signature as it exits the product slowdown device.

The acceleration device is equipped approximately as a rotating cam with an approximately cylinder jacket-shaped effective area, which has a greatest distance from the axis of rotation or the largest radius with respect to the axis of rotation of this accelerator device. The incoming signature with the first speed is thus detected by the active surface of the accelerating device and decelerated to the second speed of the accelerating device due to the simultaneous contact with the counter roller and the resulting contact pressure for the existing in circumferential or rotational direction length of the active surface. After only a portion of the circumference of the accelerator has a corresponding effective radius and the remaining outer contour within a circle, which is described by the effective radius, is the albeit negative acceleration of the signature only on a relatively short range of the signature, which is usually much smaller than is the extension of the signature in the transport direction and preferably lies in the outlet-side region of the signature, so that the signature leaves the product slow-down device at a second speed.

Alternatively, it is also possible that the signature is detected on the top and the bottom of two rotating, designed as a cam-like acceleration devices and braked accordingly.

Such acceleration devices are for example from the DE ° 100 ° 55 ° 867 ° C2 , from the EP1 ° 840 ° 058 ° B1 or the US 6,572,097 B2 known. Both soft braking cams, which are usually made of elastomers, in conjunction with a hard counter cam or counter roller, which is usually made of metal and optionally provided with a corresponding wear-resistant coating, are known from the prior art. But it is also known hard, preferably off a cams made of a metallic material with a soft, such as coated with an elastomer mating roll to use.

From the prior art, however, only acceleration devices are known in which the active surface, which has approximately the shape of a cylindrical surface or a section thereof abruptly and thus settles with a clearly demarcated edge of the remaining lateral surface of the accelerator, as this a relatively inexpensive production and a very clearly defined Aufsetzpunkt on the accelerated signature allows.

However, such a configuration of the outer contour of the acceleration device has the disadvantage that thereby the active surface very abrupt touches down on the signature or on the counter-roller or gets in contact with this very abruptly, which is connected to a high load on the signature. In addition, subject by the very selective placement of the effective surface on the signature and thus indirectly on the counter roll or counter cam this relatively heavy wear. In a completely synchronous and clocked rotating counter roll, the cam digs at the touchdown point in the lateral surface of the counter roll, at a not completely synchronous and thus ungetaktet rotating counter roll arise on the outer surface of the counter roll due to the relatively hard touch corresponding chatter marks, which in a limited Service life of the counter roll and / or the accelerator device resuliert.

The invention is therefore based on the object to provide a solution with which on the one hand reduces the wear itself and the service life of the accelerator device and / or the counter roll is additionally increased.

This object is achieved by a device according to claim 1.

The object is achieved in that at least one of the transitions between each active surface and the adjacent at both ends of the active surface retaining surface lateral surfaces rounded with a rotation axis parallel to the circumferential surface or is chamfered with a chamfer surface.

Such an embodiment of an acceleration device has the advantage that is significantly reduced by the very gentle contacting of the active surface with the signature and thus indirectly with the backing roll in particular the relatively selective wear on the touchdown point, so that both burial and the formation of chatter marks significantly reduced is, resulting in significantly longer service life of both the accelerator device and the counter roll. Another advantage is the gentler acceleration of the signatures to be accelerated.

In an advantageous embodiment, both transitions between each active surface and the adjacent at both ends of the active surface retaining surface lateral surfaces on a rounding jacket surface, so that the transition is rounded or the transition is chamfered, so that at both ends of each active surface and the Both ends of the active surface adjacent holding segment-lateral surfaces chamfer surfaces are present.

Such a solution has the advantage that in case of wear of the rounding or chamfering surface and / or the active surface, the accelerating device can be mounted rotated by 180 ° about an axis perpendicular to the axis of rotation, so that both an effective surface associated rounding or chamfering Mantle surfaces can be used as in the direction of rotation leading side of the effective surface.

Since most viewed in the direction of rotation front part of the active surface is exposed to greater wear, its service life can be approximately doubled by this design of the accelerator.

In a particularly advantageous embodiment, each active segment of the acceleration device is symmetrical to a plane which is spanned by the axis of rotation and the respective bisector of the effective angle of the respective active segment.

Due to the symmetrical design of the at least one effective segment or the plurality of active segments in itself after 180 ° twisted benefits the acceleration behavior of each active surface at least within the usual technical tolerances and variations are identical, which is a readjustment of the settings after turning the accelerator makes unnecessary.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Various embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

1 a product slowdown device with counter roll in operative connection with a signature

2 an acceleration device according to the prior art

3 an accelerator device with a plurality of active segments

4 an acceleration device according to the invention with a rounding

1 exemplifies a product slowdown device 1 as known in the art. This includes an accelerator device 2 with at least one active segment 10 , In the embodiment of 1 is an example of an acceleration device 2 with only one effective segment 10 shown. The effective segment 10 is either a separate component, which is on the holding segment 13 is attached or the active segment 10 is only an area of a component, which with the signature to be accelerated 4 comes into active connection.

The signature to be accelerated 4 runs in the 1 illustrated example with a first speed v1 in the product slowdown device 1 on to be decelerated to speed v2. The accelerator device 2 rotates with the peripheral speed ωw about the axis of rotation 5 , Wherein this peripheral speed corresponds to the second speed v2. Also the counter roll 3 rotates with the peripheral speed ωg, which is equal to or different from the peripheral speed ωw. Usually comes the effective segment 10 the accelerator device 2 in the second half of the signature as seen in the running direction 4 in operative connection with this, so that the signature 4 in the gap between accelerator 2 and counter roll 3 clamped and braked to the second speed v2.

2 shows an exemplary accelerator 2 as known in the art. This example consists of an effective segment 10 , where the effective segment 10 is defined only as an area of the component which coincides with the signature to be accelerated 4 enters into operative connection.

The effective segment 10 has an effective surface formed approximately as a cylindrical lateral surface 11 which is in operative connection with a sheet or signature to be accelerated or retarded 4 can be brought. The one approximately cylinder jacket-shaped effective area 11 has one on a perpendicular to the axis of rotation 5 standing face 12 projected effective radius Rw. The effective area 11 is through two on the face 12 projected circle radii W limited. The holding segment 13 has one on the perpendicular to the axis of rotation 5 standing face 12 projected holding segment contour 14 on, being on the end face 12 projected holding segment contour 14 is within a circle, which by the effective radius Rw about the axis of rotation 5 is defined. The retaining segment contour 14 spans in extension parallel to the axis of rotation 5 a retaining segment jacket surface 15 on.

Like from the 2 can be seen, have the known from the prior art acceleration devices 2 a sharply defined transition between the effective surface 11 and the adjacent retaining segment lateral surfaces 15 on. Although the shape of the effective area corresponds 11 Although essentially a cylinder surface, since the effective surface 11 to accelerate not only punctually with the signature 4 may be in contact but over a certain Abrolllänge with the signature 4 must be in operative connection, yet it comes to the employment against the platen, if a signature 4 in the gap between accelerator 2 and counter roll 3 is clamped to a sudden buildup of clamping force, resulting in a burden or even shift the position of the signature 4 as well as with increased wear both at the leading edge of the effective surface 11 as well as at the contact point on the counter roll 3 accompanied. Limited life of both the accelerator device 2 as well as the counter-roller 3 is the consequence.

3 shows in addition to 2 schematically an accelerator device 2 with a plurality of active segments 10 two. Such an accelerator device 2 thus comes in one revolution with two signatures 4 in contact to either decelerate or accelerate positively, such as in a so-called tear-off perforation. The present invention is also related to an accelerator device 2 with a plurality of active segments 10 applicable, although due to the better representability of these on an example with only one effective segment 10 is explained.

4 shows an embodiment of an acceleration device according to the invention 2 with only one effective segment 10 although the invention applies to accelerators 2 with a plurality of active segments 10 is applicable.

4 shows an example of an acceleration device according to the invention 2 , with only one effective segment 10 and thus with only one effective area 11 , The effective segment 10 is defined only as an area of the component which matches the signature to be accelerated 4 enters into operative connection. However, it is also possible to use the effective segment 10 perform as originally separate component, which with the holding segment 13 to an accelerator 2 is joined together.

The effective segment 10 has an effective surface formed approximately as a cylindrical lateral surface 11 which is in operative connection with a sheet or signature to be accelerated or retarded 4 can be brought. The one approximately cylinder jacket-shaped effective area 11 has one on a perpendicular to the axis of rotation 5 standing face 12 projected effective radius Rw. The effective area 11 is through two on the face 12 projected circle radii W limited. The holding segment 13 has one on the perpendicular to the axis of rotation 5 standing face 12 projected holding segment contour 14 on, being on the end face 12 projected holding segment contour 14 is within a circle, which by the effective radius Rw about the axis of rotation 5 is defined. The retaining segment contour 14 spans in extension parallel to the axis of rotation 5 a retaining segment jacket surface 15 on.

In contrast to the prior art, the acceleration device according to the invention 2 the feature that at least one of the transitions between the or each effective area 11 and at the two ends of the effective area 11 adjacent retaining segment lateral surfaces 15 with one to the axis of rotation 5 parallel rounding surface 16 rounded.

In projection on the face 12 This means that the transition between the contour of the effective surface 11 and the adjacent retaining segment contour 14 at least one transition between effective area 11 and holding segment contour 14 is rounded, preferably by means of a constant or varying fillet radius Rr.

The fillet radius Rr is basically the geometry of the accelerator 2 such as the size of the accelerator 2 , the angle between effective area 11 and the retaining segment lateral surface 15 etc. to adapt. When used on components for web presses, the radius of the fillet, which is also referred to as the fillet radius Rr, is in the range of about 5 millimeters to about 120 millimeters, preferably in the range of about 10 millimeters to about 70 millimeters ,

Alternatively or as a supplement to the rounding of this transition between the active surface 11 and the adjacent retaining segment lateral surfaces 15 can also be in the projection on the face 12 a chamfer are attached, so that by chamfering in extension of the axis of rotation 5 a chamfer surface 17 is produced in function of a run-on slope, by which when using such an accelerator device 2 in a product slowdown device 1 also the pressure between the signature to be accelerated 4 and the accelerator 2 and thus also the pressure between the accelerating device 2 and the counter roll 3 not abruptly and thus not abruptly but steadily built.

Like in the 4 illustrated, it is also possible and particularly advantageous if the accelerating device 2 at both transitions between each effective surface 11 and at both ends of the effective area 11 adjacent retaining segment lateral surfaces 15 with a rounding surface 16 or with a chamfer surface 17 be provided, that is, that the transitions at both ends of the active surface 11 between the effective area 11 and the adjacent retaining segment lateral surfaces 15 rounded or chamfered.

Such a configuration in which both transitions of an active surface 11 rounded or chamfered executed, has the advantage that at a correspondingly high wear of the first rounding circumferential surface in use 16 or chamfer surface 17 the accelerator 2 when used in a product slowdown device 1 about an axis perpendicular to the axis of rotation 5 and thus rotated by 180 degrees, so that the second rounding surface not yet in use 16 or chamfer surface 17 at the same direction of rotation of the accelerator device 2 in the product slowdown device 1 becomes the new leading edge or surface. Thus, with appropriate wear of the first rounding or chamfer surface 16 . 17 not the direction of acceleration to be replaced, but by using the second rounding or chamfer surface 16 . 17 can thus the accelerator device 2 be used longer, so that the service life of this approximately doubles.

In a particularly advantageous embodiment is each active segment 10 symmetrical to a plane passing through the axis of rotation 5 and the respective bisector of the Angle of action αw of the respective active segment 10 is stretched. This allows an exact same acceleration behavior after the installation of the accelerator device rotated by 180 degrees 2 in a product slowdown device 1 due to the same geometric conditions and thus reduces or avoids additional Einrichtvorgänge.

But it is also possible in principle, the accelerator device 2 intentionally asymmetrical to the plane passing through the axis of rotation 5 and the respective bisector of the effective angle αw of the respective active segment 10 is stretched to execute. For example, at one end of the effective surface 11 a rounding surface 16 and at the other end of the effective area 11 either a rounding surface 16 with another fillet radius Rr or bevel face 17 be attached. Thus, different acceleration behavior with appropriate orientation in the product slowdown device 1 be used.

This in 4 illustrated embodiment has only a single active surface 11 on, the two transitions between the effective surface 11 and the two adjacent retaining sheath lateral surfaces are symmetrical to a plane passing through the axis of rotation 5 and the bisector of the effective angle αw is spanned.

Furthermore, the shows 4 an embodiment of the accelerator device 2 in which the active segment 10 and the holding segment 13 are united in a single part and executed as one component. However, it is also possible to use the effective segment 10 as originally separate component and manufacture and then this with the holding segment 13 to add. Such a configuration in which the active segment 10 and the holding segment 13 consist of a plurality of parts, allows the combination of different materials for the active segment 10 and for the holding segment 13 ,

Furthermore, the in 4 illustrated embodiment of the accelerator device 2 the feature on that the only part, which the Wirksegment 10 and the holding segment 13 comprises, a substantially constant dimension in the extension of the axis of rotation 5 having.

However, it is also possible that the thickness of an accelerator device 2 over the extension of the frontal area 12 varies or that, for example, the active segment 10 one of the holding segment 13 in extension of the axis of rotation 5 has different dimensions. For example, the width of the effective area 11 be enlarged without the entire holding segment 13 is carried out correspondingly massive.

Due to the many possibilities of the embodiment of an acceleration device according to the invention 2 There is a great variety in the choice of materials.

For example, the accelerator device 2 consist of a metallic material such as aluminum or steel. It is usually advantageous if the active surface 11 as well as the rounding surface 16 or the chamfer surface 17 coated or coated, so that in particular the wear properties and thus the service life can be significantly improved by the coating. Furthermore, properties such as, for example, the ink acceptance behavior can be significantly optimized in order to achieve a smearing on the signatures 4 or dropping on the accelerator 2 to avoid.

For example, the effective area 11 as well as the rounding surface 16 or the chamfer surface 17 be coated or coated with polytetrafluoroethylene.

However, it is also possible in an accelerator device 2 to pair different materials. For example, the retaining segment 13 made of a metallic material to the retaining segment 13 by means of concentric with the axis of rotation 5 hole to be mounted on a drive shaft, whereas the effective segment 10 made of polyurethane or another elastomer. As a joining method of different materials here either clamped connections or a cohesive connection by means of gluing available.

A like in 4 illustrated acceleration device 2 can thus be in a schematic as in 1 shown product slowdown device 1 for speeding up or delaying sheets or signatures 4 wherein the product slowdown device 1 a cylindrical counter roll 3 includes used. In such a product slowdown device 1 becomes the counter roll 3 with at least one acceleration device according to the invention 2 in the form employed that the sheet to be slowed down in operative connection with both the counter roll 3 as well as with the effective area 11 the accelerator device 2 stands.

In this case, in extension of the axis of rotation 5 a plurality of acceleration device according to the invention 2 side by side, namely either immediately adjacent to each other or spaced apart, be arranged.

LIST OF REFERENCE NUMBERS

1

 Product deceleration device

2

 accelerator

3

 backing roll

4

 signature

5

 axis of rotation

10

 active segment

11

 effective area

12

 face

13

 holding segment

14

 Retaining segment contour

15

 Retaining segment lateral surface

16

 Fillet lateral surface

17

 chamfer

rw

 effective radius

rr

 Rounding radius

W

 circle radius

aw

 angle of action

ωw

Peripheral speed effective segment

ωg

 Peripheral speed counter roll

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10055867 C2 [0007]
• EP 1840058 B1 [0007]
• US 6572097 B2 [0007]

Claims (13)

Accelerator for accelerating or decelerating sheets or signatures ( 4 ) or to tear off sheets or signatures ( 4 ) of webs or strands, wherein the accelerating device ( 2 ) about a rotation axis ( 5 ) is rotatable, and wherein the acceleration device ( 2 ) of at least one effective segment formed as a cylinder segment ( 10 ) and at least one holding segment ( 13 ), and wherein the at least one active segment ( 10 ) an approximately as a cylindrical lateral surface formed active surface ( 11 ) which is operatively connected to a sheet or signature to be accelerated or retarded ( 4 ), wherein the at least one approximately cylinder jacket-shaped active surface ( 11 ) at least one on a perpendicular to the axis of rotation ( 5 ) standing face ( 12 ) has a projected effective radius (Rw), and wherein each active area (Rw) 11 ) by two on the face ( 12 ) projected circle radii (W) is limited and wherein the two circle radii (W) per effective area ( 11 ) include the angle of action (αw), and wherein the retaining segment ( 13 ) one perpendicular to the axis of rotation ( 5 ) standing face ( 12 ) projected almost any retaining segment contour ( 14 ), wherein on the end face ( 12 ) projected holding segment contour ( 14 ) within a circle, which is defined by the effective radius (Rw), and wherein the holding segment contour ( 14 ) in extension parallel to the axis of rotation ( 5 ) a holding segment lateral surface ( 15 ), characterized in that at least one of the transitions between each active surface ( 11 ) and at both ends of the active surface ( 11 ) adjacent retaining segment lateral surfaces ( 15 ) with an axis of rotation ( 5 ) parallel rounding surface ( 16 ) rounded or with a bevel surface ( 17 ) is chamfered. Acceleration device according to claim 1, characterized in that the two transitions between each active surface ( 11 ) and at both ends of the active surface ( 11 ) adjacent retaining segment lateral surfaces ( 15 ) are rounded or chamfered. Acceleration device according to one of claims 1 to 3, characterized in that the radius of the rounding () in a range of 5 mm to 100 millimeters, but in particular in a range of 10 to 70 millimeters. Acceleration device according to one of claims 1 to 3, characterized in that the active segment ( 10 ) and the holding segment ( 13 ) are united in a single part. Acceleration device according to claim 4, characterized in that the single part which forms the active segment ( 10 ) and the holding segment ( 13 ) has a substantially constant dimension in the extension of the axis of rotation ( 5 ) having. Acceleration device according to one of claims 1 to 3, characterized in that the active segment ( 10 ) and the holding segment ( 13 ) consists of a plurality of parts. Acceleration device according to one of claims 2 to 6, characterized in that each active segment ( 10 ) is symmetrical to a plane passing through the axis of rotation ( 5 ) and the respective bisector of the effective angle (αw) of the respective active segment ( 10 ) is stretched. Acceleration device according to one of claims 1 to 7, characterized in that the acceleration device ( 2 ) consists of a metallic material. Acceleration device according to claim 8, characterized in that the active surface ( 11 ) as well as the rounding surface ( 16 ) or the chamfer surface ( 17 ) are coated or coated. Acceleration device according to claim 9, characterized in that the active surface ( 11 ) as well as the rounding surface ( 16 ) or the chamfer surface ( 17 ) is coated or coated with polytetrafluoroethylene. Acceleration device according to one of claims 1 to 7, characterized in that the active segment ( 10 ) is made of polyurethane. Product slowdown device for accelerating or delaying sheets or signatures ( 4 ), wherein the product slowdown device ( 1 ) a cylindrical counter-roller ( 3 ), characterized in that the mating roll ( 3 ) with at least one acceleration device ( 2 ) according to any one of claims 1 to 11 in the form that the sheet to be slowed down is operatively connected both to the counter-roll ( 3 ) as well as with the effective area ( 11 ) of the accelerator device ( 2 ) stands. Product slowdown device according to claim 12, characterized in that in extension of the axis of rotation ( 5 ) a plurality of accelerating devices ( 2 ) is arranged according to one of claims 1 to 11.

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