EP0718229B1 - Device for tentering a moving web - Google Patents

Description

The invention relates to a device in the preamble of claim 1 specified type.

DE 28 53 519 A1 describes a device for stripping a web of material known, which has several threaded spindles. The lead screws are rotated by means of a motor so that its threads turn the web pull to the edge. To the stripping effect of this device on the web To be able to adjust, a roller is designed pivotable, so that the wrap angle the web around the threaded spindles can be adjusted.

A similar device is known from US 26 39 483. It has three in a row arranged threaded spindles, which is preceded by a role. The web is removed from a stack from above and redirected at the roller. The web is therefore the threaded spindles approximately in a running through them Level fed. This ensures that the individual threaded spindles are defined in Wrapped around the web and therefore a constant stripping effect exert on the web.

Since the threaded spindles of these known devices only in the edge area of the Material web are provided and do not run across the entire width of the material web, this known device harbors the risk that the web of material on the free Ends of the threaded spindles caught. Especially when samples of the web removed or when two panels have been joined or sewn together caught a hole in the web at the top of the threaded spindle. In this Case tears the web or the stripping device is damaged, so that the System must be switched off.

A web guide is known from WO 91/16258, which has an edge region a web by means of two opposing rollers in the clamping handle detected. The rollers are driven to rotate such that the two rollers on the Line of contact with the web at the same speed as the web. The axes of the two rollers aligned parallel to one another are of this type held pivotable that they are adjustable with the web running direction, pointed Form an angle. In this way there is a lateral displacement force on the entire web exercised. An edge scanning device is arranged downstream of the web guide, which, together with a control device, corrects the web path of the material web enables. To reduce the risk of accidents arising from the pair of rollers is in the area where the roller surfaces are on the line of contact with the web move, a safety device is provided.

From CH-A 0 049 584 another goods operator is known, who is also the Material web with two opposing rollers in the clamping handle holds. in the In the area of one of the rollers, a plate-like stand is provided, which is one of the rollers essentially covers. Its job is to keep the current web of to protect steam emerging from an actuating cylinder.

The invention has for its object a device of the aforementioned To create a way that enables a safe and gentle detection of the web, even if the web has holes in the detection area of the device.

The object is achieved with the in the characterizing part of Features specified claim 1 solved.

The device according to the invention uses web guiding bodies around the material web keep away from the free ends of the threaded spindles. Become the web guide provided at the point mentioned in claim 1, it is surprisingly simple Way ensured that the web is always tangent to the threaded spindles accumulates. The area B of the web after a hole is through the web guide pushed so far away from the threaded spindle that it is properly tangential is gripped by the threaded spindle. Because there are holes in the web in the free Ends of the threaded spindles can no longer get caught is a gentle and trouble-free operation guaranteed. The web guiding bodies are preferably arranged in such a way that they do not affect the course of the properly tapering web, but are spaced from it. The web guiding bodies therefore only unfold in Incidents such as holes, tears or sagging of the web have their effect. This has the advantage that the material web is not constantly affected by friction, which are caused by the web guiding bodies is braked. Is just a guiding body provided, this is preferably in front of the first threaded spindle in Viewed web direction attached. Especially when the web is bad is tensioned or severely torn at the edge, it preferably threads on the first threaded spindle on. The following threaded spindles are due to the low Distance between the spindles reduces the risk. In particular, it is convenient provide a web guide in front of each threaded spindle. The track is very loose, it can sag between the individual threaded spindles. This could lead to threading the web on one of the threaded spindles, what is reliably prevented by the web guide.

The application of the feature according to claim 2 is advantageous because the arrangement of the web guide near the threaded spindle, even with large holes in the web a secure grasping of the material web guaranteed by the threaded spindles. The guiding section of the web guiding body preferably extends at least to one imaginary normal plane to the incoming web, which is the threaded spindle touched.

This results in a particularly clean feed of the material web to the threaded spindle by applying the feature from claim 3. In particular, up to the lateral Web edge torn webs prevents the guide section that the after Tear arriving section of the web from the opposite side of the Threaded spindle could be detected. Because the surface of the lead screw is on this side in the direction of web travel, the could without the web guide Wrap the web completely around the threaded spindle, causing the web to tear at this point.

The application is to prevent the web from being threaded into the web guide of the features according to claim 4 advantageous. A large distance of the guide section of the web reliably prevents threading of the web on Web guide.

The formation of the guide section according to claim 5 is particularly favorable since due to the acute angle of the guide section also one is not working properly incoming web is correctly guided to the threaded spindle. Especially if due to an extremely large lateral offset the contact with the Has lost threaded spindles, the guide sections of the web guide body ensure correct re-threading of the web around the threaded spindles. The web run need not be interrupted in this case, so that the productivity of the Device increased.

A rounded transition between the leading section and the leading section according to claim 6 advantageously ensures correct running of the web, even if it has a hole exactly at the transition between them. The rounded transition does not obstruct the web in any way, so that the web the threaded spindle properly even at high running speeds is fed.

The formation of the web guide body according to claim 7 is inexpensive, since in particular a re-threading of a web that makes contact with the threaded spindles has lost, will be threaded back very securely. The viewed from the side sloping guide sections of the web guide body capture the web edge, which is then lifted into its correct position when the web is moved further or is lowered. The material web is re-threaded into the device therefore automatically.

A particularly inexpensive embodiment of the web guiding body is in claim 8 given. An angled rod fulfills with the least material and manufacturing effort the task, so that the entire device by attaching the web guide barely expensive. The rods preferably have one round cross-section in order to provide the web with as little resistance as possible. Around To ensure the required stability over their entire length, they are preferred made of metal, such as stainless steel.

If a threaded spindle is pivoted to adjust the wrap angle, so the application of the feature according to claim 9 is advantageous. A panning of the web guide with the threaded spindle ensures a correct position of the web guide independent of the swivel angle. Preferably too the web guide in front of the threaded spindle following the swiveling threaded spindle pivoted to their position to the incoming section of the web adjust accordingly.

Due to the flat design of the guide section according to claim 10, the Material web fed to the threaded spindles particularly gently. Even with deep ones Cracked and heavily sagging material web will properly the threaded spindles fed. This configuration of the web guiding body is preferably at Threaded spindles are used, which capture the underside of the web, because sagging webs on these spindles can catch particularly easily. If the guide section covers the threaded spindle axis, the feed of the material web is to the threaded spindles even safer. In addition, the leading section in in this case, effective protection against contact for the threaded spindle by the operator Person. This reduces the risk of accidents caused by the threaded spindles.

In the formation of the web guide body according to claim 11, this covers one Most of the area of the threaded spindle that is used to strip out the edges of the web is not used. This reduces the risk of accidents caused by the threaded spindles further reduced. Is the web to be spread wet or with impregnated with chemical agents, the web guide has at the point below the Threaded spindle preferably one or more recesses that allow the drainage Allow liquids to drip off the web.

The formation of the guide section according to claim 12 allows a special inexpensive and safe threading of the web into the threaded spindles. A catch the web during threading on the flat guide section is excluded even if it is torn at this point. By the flat detection of the web with the guide section becomes very kept gently so that damage to even sensitive webs is excluded are.

A structurally particularly simple and therefore inexpensive realization of the web guiding body results from application of the features of claim 13. By the one-piece Several guideways can be combined in one step for example, by casting or deep drawing a sheet.

Finally, it is favorable according to claim 14 to releasably fix the web guide. As a result, the web guide body can be cleaned very easily, which is particularly the case with wet or soaked with chemical agents is important. Furthermore the device can be easily adapted to different operating conditions, if the attachment of the web guide is not desired for a particular web. It when the web guide body by means of a quick attachment is particularly advantageous is set. This reduces the time required to loosen or attach the Web guiding body and thus the committee in the entire production line.

Preferred embodiments of the invention are shown in the drawing Device explained by way of example, without restricting the scope of protection.

Figur 1

eine perspektivische Darstellung einer Vorrichtung zum Ausstreifen einer laufenden Warenbahn mit stabförmigen Bahnleitkörpern,

Figur 2

eine perspektivische Darstellung einer Vorrichtung zum Ausstreifen einer laufenden Warenbahn mit einem kastenförmigen Bahnleitkörper und

Figur 3

eine perspektivische Darstellung eines Bahnleitkörpers für zwei Gewindespindeln.

It shows:

Figure 1

1 shows a perspective illustration of a device for stripping out a running web of material with rod-shaped web guiding bodies,

Figure 2

a perspective view of a device for stripping a running web with a box-shaped web guide and

Figure 3

a perspective view of a web guide for two threaded spindles.

A device 1 according to FIG. 1 for streaking a running in the direction L. Material web 2 is on both sides of the material web 2 shown only in the partial area provided, only the device 1 is shown on one side. it consists of several threaded spindles 3, 4, 5, 6 with threads 7, which capture the web 2. The threaded spindles 3, 4 and 5, 6 are combined in blocks 8 and 9, which are connected to a gear unit 10. To drive the threaded spindle 3, 4, 5, 6, a motor 11 is provided, which with the threaded spindles 3, 4, 5, 6 via an unillustrated transmission in the transmission unit 10 in operative connection stands. The motor 11 sets the threaded spindles 3, 4, 5, 6 in rotation, whereby the threaded spindles 3, 4, 5, 6 in directions 13, 14, 15, 16 about axes 23, 24, 25, 26 rotate. By the wrap angle of the web 2 around the threaded spindles 3, 4 To be able to adjust, the block 8 is pivotable about the axis 24 of the threaded spindle 4. An actuating device 27 is provided on the block 8 for pivoting, which has a worm gear at the lower end, not shown. The Threads 7 of the threaded spindles 3, 4, 5, 6 are arranged so that they face the outside Edge 28 of the web 2 generate directed forces K. This leads to one Strip out the web 2 and roll out its edge 28. To achieve an optimal To achieve rolling effect through the threaded spindles 3, 4, 5, 6, their directions of rotation are 13, 14, 15, 16 set so that the threaded spindles 3, 4, 5, 6 in the contact area move the web 2 against the running direction L. This allows for a predetermined stripping effect a reduction in the speed of rotation the threaded spindles 3, 4, 5, 6.

For quality control of the web 2, this is usually from time to time Samples taken. This is generally done by punching out a piece of the Web 2 so that a hole 30 is formed. The test piece becomes the web 2 Usually not taken at the edge 28 because this area is used for quality assessment is less meaningful. In addition, a recess on the Edge 28 of the web 2 disturb an edge position control in a sensitive degree. Such a hole 30 can, however, in particular at the free ends 33, 34, 35, 36 of the threaded spindles 3, 4, 5, 6 caught. This leads to a tearing of the Web 2. To thread web 2 at the free ends 33, 34, 35, 36 to prevent the threaded spindles 3, 4, 5, 6 are according to the invention in front of the threaded spindles 3, 4, 5, 6 web guide 43, 44, 45, 46 provided. They are considered angled Rods formed with a round cross-section, which are fixed in blocks 8, 9 are. Alternatively, the plane spanned by the legs of the bars can also be filled be so that the web guide 43, 44, 45, 46 is plate-shaped. The function of the web guide 43, 44, 45, 46 is not affected by this. When the block 8 is pivoted using the actuating device 27 therefore the web guide 43 and 44 pivoted with it. The web guide 43, 44, 45, 46 have guide sections 53, 54, 55, 56, to which are rounded Connect transitions 63, 64, 65, 66 to guide sections 73, 74, 75, 76. For Increase the wrap angle of the web 2 around the threaded spindle 5, 6, a deflection part U is provided between them.

Since the function and structure of the web guide 43, 44, 45, 46 are the same, they are carried out Description by way of example using the web guide body 43. The web guide body 43 is located on the same side of the web 2 as the threaded spindle behind it 3. It is located between the one running towards the respective threaded spindle 3 Section 77 of the web 2 and a plane ε parallel thereto, which through the axis 23 of the threaded spindle 3 runs. It is arranged in such a way that it is properly dated tapered web 2 is spaced so that its run under this Circumstances is not affected. The guide section 53 of the web guide body 43 is as possible near the tapered section 77 of the web 2 and the threaded spindle 3 arranged. To prevent the area B of the web 2 after the hole 30 is gripped by the upper area 78 of the threaded spindle 3, the guide section 53 of the web guide 43 below the axis 23 of the threaded spindle 3. The Material web 2 must therefore be tangential to the lower region 79 of the threaded spindle 3 accumulate. This prevents the material web 2 from being wrapped around a hole 30 around the threaded spindle 3 and thus tearing of the web 2.

Even if the hole 30 of the web 2 is exactly in the transition 63 between the Guide section 53 and the guide section 73 of the web guide 43 is located due to the rounded transition 63, the web 2 does not touch the web guide 43 caught. This guarantees a clean and trouble-free run of the web 2. The guide section 73 of the web guide body 43 forms with the tapering section 77 of the web 2 an acute angle α. To illustrate this angle α is the projection 73 'of the guide section 73 on the level of the tapering Section 77 of the web 2 shown as a dash-dotted line. The free end 80 of the guide section 73 is at a greater distance a from the web 2 than the guide section 53. The guide section 73 is so long that its free end 80 can under no circumstances be caught by the web 2 can. A distance a of the free end 80, which is approximately that, is usually sufficient for this one to two times the diameter D of the threaded spindle 3 corresponds. For the guiding elements 44, 45, 46, which are provided below the web 2, however also take into account any sagging of the web 2, so that in particular the guide section 74 of the web guide body 44 is particularly long. If the web 2 is gripped by the threaded spindle 5, 6 from the same side, as seen from the threaded spindle 4, 5 arranged in front in the running direction L, so the risk of threading the web 2 is very low, so that the guide section 75, 76 of the web guide body 45, 46 can be made relatively short. Alternatively the web guide bodies 45, 46 could also be omitted.

For automatic threading of the web 2 after an extremely large web offset to ensure, the guide portion 73 of the web guide 43 is also in Direction of the center of the web 2 bent by an acute angle β. The single ones Guide sections 73, 74, 75, 76 therefore form for the outer edge 28 of the web 2 a kind of insertion funnel, the web 2 in the correct way the threaded spindles 3, 4, 5, 6 of the device 1 feeds.

In the device 1 according to FIG. 2, the threaded spindles 4, 5 are a web guide 100 assigned, which is box-shaped. This web guide body 100 is in the Detail shown in perspective in Figure 3. It has gutter-like in the upper area Wells 101, 102, in which the threaded spindles 4, 5 are partially immersed. The gutter-shaped Recess 101 has a bottom 103 in which openings 104 are provided. Through these openings 104 dripping from the web 2 Liquid derived from the well 101. So that this liquid from Web guide body 100 can flow, this is designed to be open at the bottom. Alternatively the web guiding body 100 could also have a bottom, but then preferably Has openings that allow the liquid to drain. To increase the stability of the web guide body 100, transverse ones could also be used Struts may be provided.

The web guide body 100 has a surface 106 on the run-up side of the web 2, which with the web 2 has an acute angle γ, which can be seen in particular in FIG includes. This surface 106 forms the guide section, which is necessary for a proper Feeding the web 2 to the threaded spindle 4 ensures. To optimally fulfill this and at the same time an effective fuse protection for the threaded spindle 4 for one To ensure the operator, the upper edge 107 of this surface 106 is above the threaded spindle axis 24.

So that the web 2 can not thread on the threaded spindle 5 is between the depressions 101 and 102 a horizontal web 108 pulled upwards. This web 108 has the same height as the upper edge 107 of the surface 106 and forms a guide section for the threaded spindle 5. In the web 108 there is a recess 109 provided, which serves to receive an edge sensor, not shown, the scans the edge position of the web 2. On the surface 106 opposite The web guide body 100 has a wall 111 which is only in the Area of the free end 35 of the threaded spindle 5 is provided. This wall 111 prevents sagging of the web 2 between the threaded spindles 5 and 6. It also provides safety protection to the free end 35 of the threaded spindle 5 Alternatively, the wall 111 could also over the entire length of the web guide 100 drawn. In this case, however, should also be in the channel-like depression 102 openings in the bottom 103 may be provided so that from the web 2 dripping liquid can drain off.

The web guide has on the side of the free ends 34, 35 of the threaded spindles 4, 5 100 a further surface 113, which is a guide section for the web 2 forms. This surface 113 forms an acute angle δ with the web 2, so that the web 2, which has lost contact with the threaded spindles 4, 5, is guided again along the surface 113 to the top of the threaded spindles 4, 5. The web 2 therefore automatically threads itself on the correct side of the threaded spindles 3 to 6 a.

Between surfaces 106 and 113 there remains a triangular surface 114, which is connected to them is connected at an obtuse angle. Alternatively, as shown in Figure 2, the Surface 114 be rounded like a cone, so that it is almost without edges in the surfaces 106, 113 merges. Although this is more complex in terms of production technology, it is reduced this is the danger that material web 2 on the obtuse-angled edges 115 116 caught between surfaces 106 and 114 and between surfaces 114 and 113. It is also conceivable for the edges 115, 116 to be rounded.

To easily separate the web guide body 100 from the housing 117 of the gear unit 10 To be able to, it is by means of a quick fastening 118, which has a lockable plug connection can be fixed to the housing 117. As a result, the web guide body 100 can be dismantled very quickly, for example the channel-like depressions 101, 102 of deposited dirt. The necessary service life the system is kept to a minimum.

Reference list

1

contraption

2nd

Goods web

3, 4, 5, 6

Threaded spindle

7

Thread

8, 9

block

10th

Gear unit

11

engine

13, 14, 15, 16

Direction of rotation

23, 24, 25, 2

6 axis

27

Actuator

28

Edge

30th

hole

33, 34, 35, 36

free end

43, 44, 45, 46, 100

Web guide

53, 54, 55, 56, 106

Leading section

63, 64, 65, 66

crossing

73, 74, 75, 76

Guide section

73 '

projection

77

tapering section

78

upper area

79

lower area

80

free end

81

center

101, 102

deepening

103

ground

104

Breakthrough

107

Top edge

108

web

109

Recess

111

wall

113

Guide section

114

surface

115, 116

Edge

117

casing

118

Quick fastening

a

distance

α, β, γ, δ

angle

B

Area

D

diameter

ε

level

K

force

L

Running direction

U

Deflecting part

Claims (14)

1. Device for smoothing out a running material web (2) with at least two driven, threaded spindles (3, 4, 5, 6) engaging a marginal edge region of the material web (2), and at least one web-guiding body (43, 44, 45, 46, 100) located upstream of said spindle (3, 4, 5, 6), characterised in, that the web-guiding body (43, 44, 45, 46, 100) is located upstream of at least the first of said spindles (3, 4, 5, 6) seen in the direction (L) of the moving web (2), said web-guiding body (43, 44, 45, 46, 100) having a guiding segment (53, 54, 55, 56, 106) located at least in the region of the free end (33, 34, 35, 36) of the spindle (3, 4, 5, 6) between the web (2) as it runs up on the respective spindle (3, 4, 5, 6) and an imaginary plane (ε) extending parallel to it and intersecting the respective axis (23, 24, 25, 26) of the spindle (3, 4, 5, 6).
2. Device according to claim 1, characterised in, that the web-guiding body (43, 44, 45, 46, 100) with said guiding segment (53, 54, 55, 56, 106) is located adjacent to the threaded spindle (3, 4, 5, 6).
3. Device according to claim 1 or 2, characterised in, that the web-guiding body (43, 44, 45, 46, 100) with said guiding segment (53, 54, 55, 56, 106) extends along the entire length of the threaded spindle (3, 4, 5, 6).
4. Device according to at least one of claims 1 to 3, characterised in, that the web-guiding body (43, 44, 45, 46, 100) includes a leading segment (73, 74, 75, 76, 113) extending outwardly from the free end of the guiding segment (53, 54, 55, 56, 106), wherein the free end (80) of the leading segment (73, 74, 75, 76, 113) is spaced from the web (2) by more than half of the diameter (D) of the threaded spindle (3, 4, 5, 6).
5. Device according to at least one of claims 1 to 4, characterised in, that the web-guiding body (43, 44, 45, 46, 100) with said leading segment (73, 74, 75, 76, 113) forms an acute angle (α) with the material web (2) running up to the threaded spindle (3, 4, 5, 6).
6. Device according to at least one of claims 1 to 5, characterised in, that the web-guiding body (43, 44, 45, 46, 100) includes a rounded segment (63, 64, 65, 66) connected between the guiding segment (53, 54, 55, 56, 106) and said leading segment (73, 74, 75, 76, 113).
7. Device according to at least one of claims 1 to 6, characterised in, that the projection (73') of the leading segment (73, 74, 75, 76) onto the plane of the material web segment (77) running up to the threaded spindle (3, 4, 5, 6) forms an acute angle (β) with the direction (L) of the moving web (2).
8. Device according to at least one of claim 1 to 7, characterised in, that the web-guiding body (43, 44, 45, 46) is a bent rod with one leg comprising the guiding segment (53, 54, 55, 56) and another leg comprising the leading segment (73, 74, 75, 76).
9. Device according to at least one of claims 1 to 8, characterised in, that at least one of said threaded spindles (3) and the respective web-guiding body (43) located upstream to said spindle (3) are jointly pivotal around an axis (24) extending parallel to the axis (23) of said threaded spindle (3).
10. Device according to at least one of claims 1 to 7, characterised in, that the web-guiding body (100) comprises a surface located upstream of the threaded spindle (4), seen in the direction (L) of the moving web (2), wherein said surface forms the guiding segment (106) and which preferably extends the projection of the axis (24) of said spindle (4) in the direction (L) of the moving web (2).
11. Device according to at least one of claims 1 to 7 and 10, characterised in, that the web-guiding body (100) surrounds at least half a circumference of the threaded spindle (4) on a side opposite the material web (2).
12. Device according to at least one of claims 4 to 7, characterised in, that the web-guiding body (100) includes a surface (114) which forming the leading segment (113).
13. Device according to at least one of claims 1 to 12, characterized in, that at least two adjacent web-guiding bodies (100) are integrally formed together.
14. Device according to at least one of claims 1 to 13, characterized in, that the web-guiding body (100) is removably attached to a housing (117) for supporting said threaded spindles (3, 4, 5, 6), preferably by means of a quickrelease connector (118).

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