DE1635182A1 - Clamp device for biaxial tissue stretching machine - Google Patents

Description

Dr. Walter Bei

Alfred Hoeppener

Dr Hans Joachim WeB

Dr HansChr. Bea, ί 9 times in 1966

ReciitsanwSlte Sfefc »™ ^{lal iQVV}

Frankfurt a. M.-Hod * k

AdiWraße! » '

Tefclon 312649.3120H '"'

• Τ635Ί8.2

Our Ur. 12 726

Esso Research and Engineering Company, Elizabeth, N.J./USA

¹¹ Clamping device for biaxial tissue stretching machine "

The present invention relates to biaxial Tissue stretching machines in general, and in particular to an improved device for detecting the longitudinal edges of the tissue when this is the strewn area the machine runs through.

In the known machines of the conventional type, a plurality of individual brackets or engages Brackets. into the long edges of the fabric, if this is introduced into the stretching area. Every single bracket or bracket becomes one diverging guide guided along to a transverse stretch on the tissue to be transmitted during this through the forward movement that is transferred to the bracing, is drawn out. At the same time, the longitudinal distance between the neighboring brackets · ■ enlarged when these reach the diverging stretching area, so that the tissue

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is stretched in a timely manner according to the length and the transverse stretching process. if the working path of the tissue gripping, from the original, parallel to the longitudinal direction of the Web running web when entering the diverging web in the stretching area is changed, transmits this change in cooperation with the increased distance between the adjacent clamps when advancing These staples also change the tension on the tissue due to the stretching area regarding its bracketed surface. In the known machines occurred in the fabric that the Clamps, excessively high stress accumulations, to such an extent that often tearing off and breaking of the tissue in the braced Surface occurred. Even where such occurrences do not occur, the small fortune of known brackets or brackets that.

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piles along the edge of the fabric *! to · regulate and equalize, during the passage darehv the Streekbereieh to unicorn stretch · « Parameters on or in the tissue "

In accordance with the present invention are those described herein Provide brackets with a tenon * which makes it possible * that they see in their effect align yourself, for the total occurring, look at the edges of the Tissue-straightening, forces * This is how the brackets are, albeit initially engage in the edges of the fabric aligned parallel to the longitudinal axes, capable of similarly maintain their direction even after they have their diverging trajectory in the Follow the stretching range. This ability to rotate around a vertical axis enables the The clamp continues to maintain a direction that has the least amount of tension on the tissue edge transmits. Another feature of the invention

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according to the improved bracket consists in the proposal new, curved teeth on the grippers. The teeth formed in the head of the pliers are oriented so that their curvature is essentially corresponds to the direction of tension along the edge of the fabric and thus the equalization of tension in the edge of the fabric between the adjacent brackets because the Distance between adjacent brackets varies as they advance through the extension area. A Another novel feature of the invention is that Creation of improved fixings for the main part, that carries the bracket, with respect to the guideways that lead apart, so this main part is for the clamp does not rotate in a horizontal and / or vertical position with respect to the guides. This becomes the all-round

the bracket
Wear / and their tendency to get stuck reduced.

Accordingly, there is the object of the present invention in proposing an improved bracket, which reduces the accumulation of tension along the edge of the fabric, when it wanders through the Streek area.

More details are from the following description and the attached drawings.

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It shows

1 shows a somewhat schematic plan view of a biaxial stretching machine like them is used according to the invention, wherein certain parts are omitted for clarity and other parts shown partially broken off,

Figure 2 is an enlarged fragmentary sectional view taken along line 2-2 of Pig. 1,

5 is an enlarged perspective partial view, the various of the new brackets or brackets according to the Invention, while this represents the Go through stretching area,

Figure 4 is a vertical cross-section of a single staple according to the invention, generally along the line 4-4 of Figure 3,

FIG. 5 is a partial sectional view taken essentially along line 5-5 of FIG. 4;

Fig. 6 is a partial plan view of an edge.

cut the fabric, which one near each Bracket has curved portions, and

FIG. 7 shows a cross section along the line 7-7 of FIG.

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According to Pig. 1 of the drawings, the machine consists of a main frame, indicated generally at 10. The frame 10 carries feed rollers and a discharge conveyor belt system l4 for receiving and guiding a fabric l6, respectively. that is stretched in and out of the machine. The frame 10 carries two pairs of parallel, self-contained loop guides 18 and 20. Both pairs of guides are the same except that one is the mirror image of the other, as is known to those skilled in the art. Me outer guide 20 and inner guide 18 are in greater detail in the Pig. 2 and 5, which will be referred to later. However, the guides 16 and 20 to delimit the guide path 22 for the tissue clamps are arranged parallel but at a distance from one another (see FIG. 3). The guides l8 and 20 are supported by any suitable support structure, such as. B. by the stand 2k shown in FIG. 2, Similar stands, not shown, are provided for the inner guide 18.

The uprights 24, which support the guides l8 and 20, are supported by movable, not shown

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limbs carried lengthways by any one the three handwheels marked 26, 28 and ^ O can be adjusted (see Fig. I). "

Professionals will easily determine how hiring of the handwheels 26, 28 and JO on the side Distances between the opposite tracks of their correspondingly regulated sections of the guides l8, acts. In this way, the amount of lateral stretch imparted to the tissue 16 can be easily adjusted will.

As shown, the guides 18 and 20 and form the located between these guide path 22 a pair of closed annular channels, which via initial or Entrance sections 352 have, which essentially run straight and lie parallel to each other, in addition, divisive sections 5 ^, which follow out towards the exit end of the machine away from each other and limit a stretching area in between and finally straight and parallel extending portions 36 which the exit ends complete the guides (see Fig. 1).

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As can be seen clearly from FIG. 3 and from Pig »1 a plurality of stapling devices, generally indicated at 38, are attached so as to that they can be moved around the guide path 22 in an annular or revolving endless path * Each of the brackets 38 will travel along its return path advanced by the combined action with an endless conveyor belt 106, also by a pair Gears at the opposite ends of the guideway and by a screw conveyor 86, which the individual clamping devices 38 in äer desired Shape through the stretching area that leads apart the machine continues. As can be seen from FIGS. 3 and 4, each clamping device 38 has a main section or bracket 40. Each main section 40 includes a downward extending part to which a roller 82 is attached which fits into a spiral slot 84 in the screw conveyor 86 can intervene. The screw conveyor 86 is mounted on a rotatable shaft 88 and rotates in a conventional manner, advancing each individual stapler 38 along the length of the auger emotional. It should be emphasized that the spiral-shaped

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Slot 84 has a different slope, so that the brackets guided along their course gradually gain more distance, whereby the film, the The film or fabric is advanced and stretched lengthways at the same time as this in Be stretched in the transverse direction. Each of the bracket carriers has a pair of protruding upper and lower arms or legs 42 and 44 have a pair of guide rollers 46 at their upper end, which engage the upper surfaces of guides 1-8 and 20. In the same way, the lower arms or legs 44 have like rollers 46 which fit into the engage the lower surfaces of the guides l8 and 20. A Pair of U-shaped interlocking plain bearings 48 are approximately in the middle of the bracket 40 than in the longitudinal or Working direction extended wear area. In attached to the guide path 22. The sliding bearing surface, which is elongated in the longitudinal direction, prevents the guide path 22 a twisting of the bracket carrier 40 as well as a seizure in this. At the head of the bracket 40 is a bracket pivot member, indicated generally at 50, is attached and rotatable on the upper extension member 52 is attached. To reduce friction are one

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leg socket 54 and a lower disk 56 serving as a bearing between the clamp pivot part 50 and the pin 52 are provided. In this way, the clamp pivot part can be ^{rotated within predetermined angular limits with respect to the carrier 2} K). In one embodiment of the invention, the desired predetermined angular freedom of movement of the bracket pivot part 50 with respect to the attachment part 52 can extend over a total arc or angle of, namely over 10 ° of freedom in the forward direction and J55 ° in the rearward direction to the guides 18 and In this regard, reference is made to FIG. 7, in which the pin extension 52 has a protruding mounting extension 68 in the form of a dove tail, which engages with an arcuate recess 70 in the pivoting part 50, which is similarly but larger. The recess extends, as shown, over an arc or angle of 135 ^Ω * while the mounting attachment 68 has a segment of 90 ° in order to produce a total of 45 ° angular freedom between these corresponding parts.

The upper part of the pin 52 has a slot 58, which is arranged so that it has one end of a center

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arranged torsion or torsion spring 64 which in turn is held around the upper end of the pin by a washer 62 and a "c" bracket 60. The other end of the torsion spring 64 extends through a slot 66 which is located in the bracket pivot part 50. Thus the normal position of the clamp under the influence of the spring 64 is perpendicular to the path of the guides 18 and 20.

Each of the bracket pivots 50 carries a bracket arm 7k which is rotatably attached to the pivot member by a pin 72. One end of the clamping arm has a curved cam surface 76 which is arranged to mechanically contact a cam plate 77 (see FIGS. 1 and 2) during predetermined distances of travel around the guideways. Each of the clamping arms Jh is normally held in a gripping position by a pig-tailed spring 78 so that the pincer-shaped serrations 80 engage the upper surface of the tissue 16 at all times unless they are otherwise brought into the open position by the plate.

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According to Fig. 2 is the operation and engagement the clamping arms 74 easy to understand * Pig. 2 shows how the end of a vertical shaft 90 acts, which is driven by suitable means, not shown. Professionals recognize how suitable everyone is Drive motor can be connected to shaft 90, to cause it to rotate while the lateral adjustment can still be made. A clutch plate 92 is wedged on shaft 90 but slidably attached. This plate cooperates with a support plate 94, which as an abutment with a protruding shoulder is attached. The clutch plates 92 and 94 are spaced apart and provided with friction surfaces, which with opposing surfaces a gear or a transmission wheel 100 can be brought into engagement. The gear 100 is on one Bearing bush 102 hinged and provided with outwardly projecting teeth 104 which are arranged at such a distance are that the intermediate recesses with the links of the drive chain 106 come into engagement. The drive chain 106 includes a plurality of protruding fingers 108 which facilitate forward movement of the individual brackets carry out j58 after

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these leave the spiral grooves 84 to have.

When handling the / biaxially operating machine according to the invention, the fabric 16, usually made of a suitable ductile or stretchable plastic material, through the feed rollers 12 in the parallel input section 32 of Machine guided. At this stage of the procedure, the Clamping through the plate 77 in the open position brought and are notched shortly after advancing, so that. the teeth 88 the edges of the Grasp the tissue firmly, initially perpendicular to the center line of the machine. When the brackets continue their path through the entry section 32 in a parallel path, they work in such a way that they pulling the tissue through the machine and at the same time being able to move backwards towards the axis of the tissue path Rotate at any angle up to 35 ° (corresponding to the height of the backward Play between the mounting attachment 68 and the recess 70) "

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When the clamps 38 reach or enter the stretching or diverging area 34, they begin their path at an approximate angle of 20 ° with respect to the longitudinal axis of the tissue. This 20 ° change in direction of each stapler as it enters the extension area is easily offset by the ability to rotate with respect to its main portion 40. Therefore, when the staple reaches the stretching area, there is no twisting of the tissue edge under the pincer-shaped teeth. ^l

Furthermore, it is made possible by the pivoting bracket part articulated with respect to the main section 4o to stay behind the clamp or to rotate another 15 ° required to relieve the tension along the edge of the film fabric at an optimum and decrease. From Fig. 6, in which a small section of the fabric edge is shown, can be easily removed, as the bracket pivot parts 50 in terms of the direction of their path along

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the diverging guides 18 and 20 one Accept the delay angle. One can continue to do so Fig. 6 readily shows the optimal stress reduction to see which through the curved teeth 80 is reached on the pliers surfaces of the clamps * Here you can also see * how the curved Edge of the fabric the serrations in a general approaching the tangential direction at the edges of the tong surface. With the clamps according to the state of the art gets related to the straight direction of the gears with their inability to relate to their main section to rotate, undesirably high voltage stresses in the areas near the brackets that usually cause curling of the tissue, even when endeavored to be optimal and controlled working conditions are maintained. With the present invention, the critical effect has been achieved these labor factors are reduced to a significant extent and a machine is created that is economical Way can be worked in practice.

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Another feature of the particular practical suitability of each of the clips according to the invention, which be able to rotate in relation to their main section, is that these staples when they are along a curved path either in the stretching area or moved outside of it, are geared to pick up unequal speeds, as well like tension twists in relation to the edges of the fabric. Because all forces around each clamp forceps are in balance there are few possibilities for Accumulations of tension and for a tearing of the film, the foil or the web, which to a considerable extent have been reduced.

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Claims (1)

1835182 April 29, 1966 Claims 1. Biaxial tissue stretching machine, thereby marked t that they are a feeder for a fabric material in and through a stretching area that the Stretching range is limited by guides that are in Relation to the longitudinal axis and in the direction of the Tissue course are attached diverging and a multitude of movable ones along the guides Has clamps that grasp the tissue edges and the tissue through the stretching area able to slide forward, and that each of the brackets including a main section has elements that engage the feeders around the main section along the guides to advance in a fixed ratio to this, as well as via clamping arms that can be rotated on the Main section for engaging the tissue edge are attached, these clamping arms can rotate in relation to the main section while U.N- they go through the stretching area, and each / even Feed rate and angle of tension in the tissue are balanced and the tension accumulates be reduced in the stretching area, - ² - "V 109825/1523 ν; 2. Machine according to claim 1, characterized in that the clamping arm has a movable pincer , section includes that this pliers section over a multiplicity of toothings in the tissue plane for engagement in this that the toothings has are curved with respect to the central axis of the tissue. and essentially tangential to the direction of Tensions that are in the fabric edge near the Pliers occur, have arranged end sections, the tension acting in the longitudinal direction in the Tissue substantially balanced and along the edge between the adjacent staples is discharged below the surface of the pliers section. 3. Machine according to claim 1 or 2, characterized in that that each of the Verklananerungen has an elongated slide bearing, which with the guides cooperates and prevents the main section from rotating with respect to the guides. 109825/1523 4. Machine naeh claim 1 - 3 * characterized in that each der'Gleitlager from an Eaar interlocking U-shaped _; Part around a section of the clamp body. ,. 5. Machine according to claims 1 - Λ, characterized in that that it has first and second arms or legs extending from the main portion of each bracket extend outwards that the. first arms. or legs have a roll at each end, which with the top surface of the guides Arms or connect that second / thigh each have a role at each end, which with -the lower surface of the guides are in engagement, preventing the brackets from becoming perpendicular with respect to the guides in an axis rotate to the axis of rotation of the clamping arms. 6. Machine according to claim 1 - 5 «characterized in that that each of the brackets has arms with movable pincer sections, that this pincer section has a large number of toothings in the plane of the tissue surface to engage in it, - 4 - '10 9825/1523 18351 andthat these serrations are curved with respect to the longitudinal axis of the tissue and have end portions which are essentially tangential to the direction of the _: tension occurring at the tissue edge and close to the pincer section; whereby the longitudinal tension in the tissue along the edge is essentially balanced between the adjacent brackets and removed below the surface of the & apical section » T * tissue fastener for use in a biaxial Stretching machine according to claim 1 * · 6, characterized gekennzelehnet that this has a stretching range. and ^ ede of the fastenings brackets with one Main section as well as funding includes * the Prescribed main section along the feeders in a fixed ratio, and that Clamping arms are rotatably mounted on the main portion for engagement with the tissue edge, wherein the clamping arms are rotatable with respect to the main section while they are the streek area traverse, with any inequality in the feed rate and also in the tension angle of the Tissue smoothed out and tension accumulations 4 « be reduced in the stretching area * 8. tissue fastener according to claim * J, characterized in that each of the brackets has an elongated slide bearing which cooperates with the guides and prevents the main section from rotating with respect to the feeders. 9. tissue fastening according to claim 7 or 8, characterized characterized in that each of the sliding bearings has a pair of interlocking. U-shaped Elements around a portion of the clamp body has around. I ¹ Ur: Es so Research and Eng. Comp. Lawyer 109825/1523 Empty e ι te