WO2000028140A1

WO2000028140A1 - Thread feeding device

Info

Publication number: WO2000028140A1
Application number: PCT/EP1999/008107
Authority: WO
Inventors: Andreas Hoferer; Wolf Gunter Stotz
Original assignee: Voith Sulzer Papiertechnik Patent Gmbh
Priority date: 1998-11-10
Filing date: 1999-10-27
Publication date: 2000-05-18
Also published as: ATE249548T1; EP1082491A1; DE19851673A1; DE59906964D1; EP1082491B1

Abstract

The invention relates to a device for feeding a thread or a material strip within a machine for producing and/or processing said material strip which comprises a suction hose (3) which can be subjected to underpressure in addition to a holder head (5) which is linked to said suction hose (3) and which has an accomodating cavity for said thread and/or said material strip. Said suction hose (3) and said holder head (5) can be moved in and against the direction of said material strip by means of a guiding device (11). The thread feeding device (1) is especially characterised in that the guiding device (11) is provided with a traction discharge device (19) at least in the area of the holder head (5).

Description

Transfer device

description

The invention relates to a device for transferring a threading strip or a material web within a machine for producing and / or processing the material web according to claim 1.

Transfer devices of the type mentioned here are known. They are used within a machine for the production and / or processing of a material web, for example a paper or cardboard web, and serve to thread a threading strip or the entire width of the material web from a transfer area to a transfer area when the machine is started up or after a web break to transfer a web path. This process is also known as threading. It has already been proposed to use a receiving head which has a receiving opening and is connected to a suction hose which can be subjected to a vacuum, the suction hose and receiving head being displaceable in and against the web running direction with the aid of a guide device (DE 197 24 123.9). The guide device comprises flexible guide elements, with which the receiving head and the suction hose are connected. The fact that the guide elements under a very high bias stand, the tensile forces acting on the receiving head and possibly on sections of the suction hose are also high. In order to avoid damage or destruction of the pick-up head and the suction hose, a complex and massive construction is required, which is associated with high costs.

It is therefore an object of the invention to improve a transfer device of the type mentioned in the introduction so that these disadvantages are avoided.

To achieve this object, a transfer device with the features mentioned in claim 1 is proposed. This is characterized in that the guide device, with the aid of which the receiving head and the suction hose can be displaced along the path of the web, has a strain relief device, at least in the area of the receiving head, into which the stresses and forces acting in the longitudinal direction of the at least one guide element can be introduced. The strain relief device can, for example, be designed such that the receiving head and the suction hose are completely strain relieved. Due to this configuration, a pick-up head can be realized in a lightweight construction, which preferably has a simple and therefore inexpensive construction and preferably has only a low weight. In another embodiment variant, it is provided that the tensile load device transmits the tensile forces acting on the receiving head and the tensile forces, if applicable, on the suction hose, which are transmitted from the guiding device to the receiving head and the suction hose are at least reduced to a harmless level.

An embodiment of the transfer device is preferred, which is characterized in that the strain relief device comprises at least two force absorption elements, to which at least one flexible guide element of the guide device is connected. The configuration of the two force-receiving elements arranged at a distance from one another, of which at least one is largely decoupled from the receiving head and the suction hose, is practically arbitrary. It is important that the tensile forces or tensions introduced by the prestressing of the guide element formed by a rope, a belt, a chain or the like do not lead to damage or destruction of the force absorbing elements.

In an advantageous embodiment variant, the force-absorbing elements are non-positively connected to one another via at least one force-locking element, which is preferably designed to be flexible. With the aid of the force-locking element formed, for example, by a rope, a belt or a chain, a relative movement between the two force-absorbing elements is possible, as occurs, for example, when the receiving head is transferred over the peripheral region of a cylinder or a roller.

According to a development of the invention, it is provided that the ends of the force-locking element on a are fastened first force-receiving element and that the force-locking element is guided over a guide wheel which is pivotable about an axis which is preferably oriented transversely to the web running direction and which is connected to a second force-receiving element. When the force-receiving elements are transferred over a cylinder, the two sections of the friction-locking element that run at a distance and preferably parallel to one another adapt accordingly to the curvature of the cylinder. With the help of the guide wheel it can be ensured that the distance between the two sections of the force-locking element leading from the guide wheel to the first force-receiving element remains at least essentially unchanged. The radially inner section of the force-locking element is shortened by the pivoting movement of the guide wheel to the extent that the radially outer section becomes longer. When the force-absorbing elements are displaced along a straight line, the sections of the non-positive-locking element running from the guide wheel to the first force-absorbing element have the same length. The mean value formed from the lengths of the force-locking element sections is therefore always — at least essentially — constant.

Also preferred is an embodiment of the transfer device in which the pick-up head comprises at least two articulated links. This allows the pick-up head to adapt to its curvature when transferred over a cylinder. The articulated connection is so designed that the limbs - like the links in a window / door roller shutter can tilt relative to each other.

In a preferred embodiment, it is provided that part or all of the members of the receiving head located between the force-receiving elements are penetrated by at least one through opening, which run transversely or substantially transversely to the axis of rotation of the members and in the longitudinal direction of the force-locking elements. The at least one force-locking element with preferably little play is arranged in these through-openings, that is to say the force-locking element is at least longitudinally displaceable in the through-openings and is guided therein. If the receiving head is curved, the force-locking element can be supported on the wall regions of the through openings facing the center of the curve.

According to a further development, it is provided that at least one of the members of the receiving head that are at least largely force-free or strain-relieved with the aid of the strain relief device is formed in several parts, the at least two parts being detachably connected to one another. This makes it possible for the links to be replaced even when the at least one guide element (rope, belt, chain) of the guide device and thereby also the non-positive element of the strain relief device is prestressed. Preferably, all those links of the receiving head are designed to be divisible by the one Air duct connected to the intake opening and connected to the suction hose.

In an advantageous embodiment, the links of the receiving head are pressed against one another with the aid of an elastic element, for example a compression spring, the links being aligned with one another and / or with other parts of the receiving head by the tensioned force-locking element.

In a further embodiment variant, the preferably automatic and precise alignment of the links takes place with the aid of an alignment device which comprises at least one alignment element formed, for example, by a straight spring steel wire, which is arranged in the openings of the links provided for this purpose with as little play as possible. With the help of the alignment device, it can thus be ensured that the links, after being transferred via, for example, a cylinder and subsequent straight travel, return to a desired starting arrangement and, above all, that the links and thus the air duct do not experience any significant lateral offset.

In addition, an embodiment of the transfer device is preferred in which the at least one force application point of the guide element and the at least one force application point of the force-locking element on the first and on the second force-receiving element are offset in the axial and / or radial direction. The force application points can therefore be in the direction of web travel seen one behind the other and / or rotated around its center (center of gravity).

Further advantageous embodiments result from the remaining subclaims.

The invention is explained in more detail below with reference to the drawing. Show it:

FIG. 1 shows a schematic diagram of an exemplary embodiment of a strain relief device provided in the area of a receiving head;

Figure 2 is a front view of the pickup head shown in Figure 1;

3 shows a longitudinal section through several members of a second embodiment of a recording head and

Figure 4 shows a cross section through the recording head according to Figure 3 along the section line A-A.

The device described below is used to transfer a material web or a threading strip separated from the material web from a takeover area to a transfer area along a web travel path, which is operated by devices, for example guide rollers, of the manufacturing and / or processing machine within which the transfer device is used, is set. The transfer device is universally applicable bar, for example for transferring paper, cardboard, textile, plastic webs or the like. The function of such a transfer device is known per se, so that only its construction will be discussed in more detail below.

Figure 1 shows a perspective view of a detail of a transfer device 1 for a material web or a threading strip, namely a suction hose 3 and a receiving head 5, which is connected to the suction hose and is shown in a highly schematic manner. The flexible and / or suction hose 3, which is made of a flexible material, is equipped with a vacuum source not shown connected. Of the receiving head 5, only one receiving opening 7 and an air duct 9 adjoining the receiving opening and connected to the suction hose 3 are shown in FIG.

About the function of the pick-up head and the suction hose:

When the suction hose 3 is subjected to a negative pressure, ambient air from the machine for producing and / or processing the material web is sucked into the receiving opening 7 of the receiving head 5. The air flow generated thereby causes the material web shown in FIG. 1 with a continuous line 8 to be sucked in or a threading strip separated therefrom into the receiving opening 7 projecting into the path of the material web / threading strip and the transport through the receiving head 5 and the suction hose 3 and carries moreover for tightening, that is, to adjust the longitudinal tension of the material web / threading strip 3.

The suction hose 3 and the receiving head 5 connected thereto can be displaced in the web running direction (arrow 13) and in the opposite direction with the aid of a guide device 11. In the exemplary embodiment shown in FIG. 1, the guide device 11 comprises twice two guide elements 15 and 17 arranged at a distance and parallel to one another, which are formed, for example, by one or each of a rope, a band, a chain or the like. The suction hose 3 is - seen in the direction of web travel (arrow 13) - arranged between the guide elements 15, 17 and connected to them in such a way that a displacement of the prestressed guide elements 15, 17, which can be up to 50 m and longer, in or against the Direction of web travel (arrow 13) the suction hose 3 and the take-up head 5 are carried along.

The guide device 11 has in the area of the receiving head 5 a strain relief device 19 which is designed such that the forces generated by the pretensioning of the two two guide elements 15, 17 are not or only to a small extent, harmless in the receiving head 5 and / or Suction hose 3 are introduced. The strain relief device 19 comprises a first force-absorbing element 21, which is shown purely by way of example as a ring 20, which is arranged here in the connection area between the suction hose 3 and the receiving head 5, and a second force-absorbing element 25 is shown by way of example as a cross 23 second force receiving element 25, which is at a distance from the first force receiving element 21, is arranged in the region of the receiving opening 7 of the receiving head 5, as seen in the direction of web travel (arrow 13). The force-absorbing element 25 can of course also be arranged at the same height as the receiving opening or behind it. As can be seen from FIG. 1, the two pairs of guide elements 15 and 17 of the guide device 11 connected to the force absorption elements 21 and 25 are interrupted in the area between the two force absorption elements 21, 25. The interruption is non-positively bridged by preferably flexibly designed force-locking elements 27 and 29, which are arranged at a distance and parallel to one another and are connected to the force-receiving elements 21 and 25. The adhesion elements 27, 29 are formed, for example, by at least one or each of a rope, a chain, a band or the like. It can be seen that the force-locking elements 27 and 29 are attached to the force-absorbing elements 21, 25 in such a way that the air channel 9 in the receiving head 5 — seen transversely to the direction of web travel (arrow 13) —is located in the space between the two force-locking elements 27, 29. In this exemplary embodiment, the force application points 31 (attachment points) of the guide elements 15, 17 on the force absorption elements 21, 25 are in relation to the force application points 33 (attachment points) of the force-locking elements 27, 29 —in the circumferential direction of an imaginary circle or the ring shown with dashed line 34 20 seen - arranged offset by approximately 90 °. FIG. 2 shows a front view in the web running direction (arrow 13) of part of the transfer device 1 described with reference to FIG. 1. The same parts are provided with the same reference numerals, so that reference is made to the description of FIG. 1. The first force absorption element 21 is designed such that it completely surrounds the suction hose 3, such that the suction hose 3 is guided quasi centrally through the force absorption element 21. It can also be seen from FIG. 2 that the cross-sectional area of the circular suction hose 3 is significantly larger than the cross-sectional area of the rectangular receiving opening 7, to which the air duct 9 adjoins — without changing the cross section. From Figure 2 it can also be seen that the receiving head 5 is designed so that the receiving opening 7 - viewed in the direction of web travel - is laterally offset from the hose opening. The receiving opening 7 projects into the web path of the material web, while the suction hose 3, the guide elements 15, 17 and the force absorption elements 21, 25 are preferably guided outside the web path. The air duct 9 thus leads from the side of the guide elements 15, 17 in their plane between them to the suction hose 3 without being hindered by the guide elements, since in this area the frictional engagement elements 27, 29 are arranged above or below.

According to an advantageous development of the invention, it is provided that the receiving head 5 comprises a plurality of links, at least two links being connected to one another in an articulated manner. In the figure 1 illustrated embodiment, the links are indicated by lines 35. A total of six links 37 of an exemplary embodiment of the receiving head 5 are shown in FIG. 3 in longitudinal section. The same parts are provided with the same reference numerals, so that in this respect reference is made to the description of the previous figures. The links 37 each have on their one side a semicircular concave shape 39 and on the other side a semicircular, convex shape 41 adapted to the shape 39 in their central region, which engages in the concave shape 39 of the respectively adjacent link 37. When the receiving head 5 is transferred via a roller, a cylinder or the like, the links 37 can tilt relative to one another, that is to say that the convex formations 41 and the concave formations 39 slide into one another. The articulated connection of the links is thus formed without additional parts, such as a bolt or the like.

The links 37 each have a through opening 43 in their central area, which form the air duct 9 in the assembled state of the receiving head 5. As can be seen from FIG. 3, due to the above-described configuration of the individual links 37 or their concave and convex shapes 39, 41, the necessary sealing of the through-openings 43 forming the air duct 9 in the connection area between two links 37, despite the relative movement of the links 37 to one another , realizable. Preferably no further sealing means are required. The In a preferred embodiment, members are pressed together by means of an elastic element (not shown). This can ensure that the convex formations 41 of the links 37 are pushed into the respective concave form 39 of the adjacent link 37, whereby at least adequate sealing of the air duct 9 from the surroundings can be ensured even when the pick-up head 5 is "cornering".

In their outer areas corresponding to the "cornering", some of the links 37 each have a through opening 45, in which the force-locking elements 27, 29 of the strain relief device 19, which in this exemplary embodiment are formed by a chain, in the assembled state of the receiving head 5 with little play are arranged, that is, the frictional locking elements 27, 29 are slidably guided within the through openings 45. In FIG. 3, the beltline of a rope sheave is indicated by dashed line 48, over which the guide elements or the receiving head are guided.

In the embodiment of the transfer device 1 shown in FIG. 3, one of the links 37 of the receiving head 5 is part of the first force-absorbing element 21 and another link 37 is part of the second force-absorbing element 25. The second force-absorbing element 25 comprises a guide wheel 49, which engages the link 37 shown on the left in FIG. 3 is arranged. The guide wheel 49 is pivotable about an axis 47 which preferably transverse to the web running direction (arrow 13) and in the plane of the guide elements 15, 17. All the design variants of the second force-absorbing element have in common that at least one force-locking element is guided over the guide wheel 49, the ends of which are each fixedly but movably connected to the first force-absorbing element 21. The task of the guide wheel 49 is, when the receiving head 5 is transferred via a roller or the like, to change the length of the radially inner portion of the force-locking element compared to the radially outer portion of the force-locking element by a pivoting movement about the axis 47, which at the same time also the longitudinal central axis of the guide wheel 49 is to balance. The design of the guide wheel 49 is correspondingly adapted to the at least one non-positive locking element guided over a circumferential area of the guide wheel 49. In the embodiment shown in FIG. 3, the force-locking element is formed by a chain 51, the ends of which are movably connected to the force-absorbing element 21 with the aid of a bolt 53 in each case (fastening points 33). A chain sprocket is advantageously used here as the guide wheel 49. If the force-locking element is formed by a rope, a band or the like, a guide roller which is preferably adapted on its outer circumference to the shape of the rope or band is used as the guide wheel.

According to a development of the invention it is provided that the strain relief device 19 with at least one rotatable about its longitudinal axis second force-absorbing element 25 connected guide roller, not shown in the figures, via which the at least one guide element 15, 17 (rope, belt, chain) is guided or deflected. Transferred to the exemplary embodiment shown in FIG. 1, the guide elements 15 and 17 would thus be formed in one piece or connected to one another to form a single guide element, the longitudinal central / rotational axis of the guide roller over which the guide element is guided preferably being vertical or essentially perpendicular to the axis 47 of the guide wheel 49, over which the at least one force-locking element is guided.

In an advantageous embodiment, the guide wheel 49 and the guide roller are distributed over a plurality of members of the receiving head, but are articulated and non-positively coupled to one another with the aid of connecting straps or the like. As an alternative to the guide wheel and the guide roller, it is also possible, for example, to use a static slide shoe, which has a curved, preferably semicircular, surface and does not have to rotate itself.

It remains to be noted that the force-absorbing element 21 and / or the force-absorbing element 25 can be integrated into the receiving head 5 or can be integrally connected to the receiving head 5. The force-absorbing elements 21, 25 can be arranged on links of the receiving head, which are movable above all in relation to the links of the receiving head that have the air channel 9. Preferably, too least the members having the air channel 9 completely, but at least essentially decoupled from the parts of the guide device 11 subjected to tension / force, that is to say free of tension / forces. As a result, at least these links can be manufactured in a lightweight construction, that is to say without a solid construction and thus with a relatively low weight and / or external dimensions.

In a preferred embodiment of the transfer device, it is provided that the force transmission from one force receiving element to the other force receiving element and the introduction of the forces and tensions caused by the prestressing of the guide elements from the guide elements into the force receiving elements takes place in different areas or in different members of the receiving head.

FIG. 4 shows a cross section through the recording head 5 shown in FIG. 3 along the section line AA. In Figure 4, two pulleys 55 and 57 are shown, over which the pick-up head 5 is guided and which are freely arranged laterally next to a web guide roller 59. It is clear that the members 37 of the receiving head 5, of which only one can be seen in the illustration according to FIG. 4, run directly with their housing on the curbs 61 of the pulleys 55, 57 when the receiving head 5 is displaced, for example, when it is moved a web guide roller - as shown in Figure 4 - comes to rest on the beltline. Stop edges 63 provided on the sides of the links 37 serve to guide the receiving head 5 the pulleys 55, 57. The receiving head 45 is here guided laterally over the stop edges 63 introduced or provided in the housing of the links on the left and right. In addition, a recess for the guide wheel 49, not shown, is indicated in FIG. 4 with a dashed line 65. It remains to be noted that the link 37, preferably all links through which the air duct passes, is / are of multiple parts, the at least two housing parts of the link preferably being detachably connected to one another.

Claims

Expectations

1. Device for transferring a threading strip or a material web within a machine for producing and / or processing the material web, from a takeover area to a transfer area along a web travel path, with a suction hose (3) which can be subjected to a vacuum and with one with the suction hose (3) connected, a receiving opening (7) for the threading strip / the material web having the receiving head (5), which with the aid of a guide device

(11) can be displaced in and against the direction of web travel (arrow (13)), the guide device (11) having a strain relief device (19) at least in the region of the receiving head (5).

2. Transfer device according to claim 1, characterized in that the strain relief device

(19) comprises at least two force absorption elements (21, 25), to which at least one flexible guide element (15; 17) of the guide device (11) is connected.

3. Transfer device according to one of the preceding claims, characterized in that the force-receiving elements (21, 25) are connected to one another via at least one, preferably flexible, force-locking element (27; 29).

4. Transfer device according to one of the preceding claims, characterized in that the force-locking element (27; 29) is a chain, rope, belt or the like.

5. Transfer device according to one of the preceding claims, characterized in that the ends of the force-locking element (27; 29) are fastened to a first force-receiving element (21) and that the force-locking element (27; 29) is pivotable about at least one axis (47) Guide wheel (49) or a slide shoe which is connected to a second force-absorbing element (25).

6. Transfer device according to one of the preceding claims, characterized in that the receiving head (5) comprises at least two articulated members (37).

7. Transfer device according to one of the preceding claims, characterized in that the force-locking element (27; 29) in through openings

(45) the links (37) is arranged with play.

8. Transfer device according to one of the preceding claims, characterized in that the members (37) of the receiving head (5) are pressed together with the aid of an elastic element.

9. Transfer device according to one of the preceding claims, characterized in that the at least one force application point (31) of the guide element (15; 17) and the at least one Force application point (33) of the force-locking element (27; 29) on the force-receiving elements (21, 25) are offset in the axial and / or radial direction.

10. Transfer device according to claim 9, characterized in that the force application points

(31) of the guide elements (15; 17) and the force application points (33) of the force-locking element (27; 29) are distributed over several members (37) of the receiving head (5), the tensile loads being transmitted with the aid of connecting elements, which are at least largely are decoupled from the limbs (37) of the receiving head (5).

11. Transfer device according to one of the preceding claims, characterized in that the receiving head (5) is designed such that the receiving opening (7) - counter to the web running direction

(Arrow (13)) seen - is laterally offset to the hose opening.

12. Transfer device according to one of the preceding claims, characterized in that the second force receiving element (25) comprises at least one guide roller rotatable about its longitudinal axis, via which the guide element (15; 17) is guided.

13. Transfer device according to one of the preceding claims, characterized in that the longitudinal axis of the guide roller and the axis (47) of the guide wheel (49) are perpendicular or substantially perpendicular to one another.

14. Transfer device according to one of the preceding claims, characterized in that - seen in the web running direction (arrow (13)) - the axis

(47) of the guide wheel (49) is aligned transversely to the web running direction.

15. Transfer device according to one of the preceding claims, characterized in that at least one of the members (37) of the receiving head (5), which are strain-relieved with the aid of the strain relief device (19), is formed in several parts, the at least two parts being detachably connected to one another.

16. Transfer device according to one of the preceding claims, characterized in that the links (37) of the receiving head (5) are preferably automatically aligned with one another by means of an alignment device.