JP4344186B2 - Tenter clip travel device for film stretching machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a tenter clip traveling device used in a plastic film transverse stretching machine and the like, and more particularly to a tenter clip traveling device provided with a guide rail provided with a rail portion for applying a preload to a traveling guide bearing. It is.
[0002]
[Prior art]
An example of a conventional plastic film transverse stretching machine is shown in FIG. Such a transverse stretching machine 1 includes a set of tenter clip traveling devices 4 that travel along a guide track 3 while moving from an inlet 2a to an outlet 2b in an oven 2, which is a hot-air heating chamber. . The guide track 3 is composed of a straight portion 3 a and a curved portion 3 b, and an inlet turn portion 5 and an outlet turn portion 6 are provided at the upstream and downstream ends thereof, and a guide is provided from the inlet turn portion 5 to the outlet turn portion 6. A chain is wound along the track 3.
[0003]
The tenter clip travel device 4 has a long endless structure in which a large number of tenter clips 7 are connected by a chain. The tenter clip 7 grips both edges in the width direction of the belt-shaped plastic film 8 and stretches the tenter clip 7. The plastic film 8 heated in the oven 2 is stretched in the transverse direction by moving in the width direction while traveling from the start position 9 to the stretching end position 10 in the longitudinal direction (from left to right in FIG. 5). It is designed to widen. The widened plastic film 8 is released from gripping by the tenter clip 7 on the outlet 2b side of the oven 2 and taken up to the next step (not shown).
[0004]
As shown in FIG. 6, the guide track 3 is formed of a track main body 13 having a vertical wall portion 11, upper and lower and intermediate horizontal wall portions 12 a, 12 b, and 12 c, and a plurality of thin steel plates. The guide rail 14 is provided perpendicularly to both ends of the portion 12c, and a presser plate 15 that holds the guide rail 14 from the outside and is bolted. The upper surface and both upper and lower side surfaces of the guide rail 14 serve as guide surfaces for a rolling guide bearing described later that rolls.
[0005]
On the other hand, as shown in FIG. 6, the tenter clip 7 includes a clip body 18 including a channel-shaped link plate 16 and a clip plate 17 screwed onto the link plate 16 (for example, a patent). Reference 1). The link plate 16 has a structure in which upper and lower flange portions 16a and 16b corresponding to an outer link of the chain are connected by a web portion 16c. A chain 29 (see FIGS. 7 and 8) is provided between the upper and lower flange portions 16a and 16b. Link pins 19 to be connected are installed along the vertical direction.
The clip plate 17 is a bifurcated arm having a clip base 17b projecting horizontally on the lower outer side (opposite to the guide rail 14) of the vertical bracket 17a and a horizontal pin 20 projecting on the upper outer side of the vertical bracket 17a. 17c, and a protruding piece 17d that protrudes in the horizontal direction on the inner side (the guide rail 14 side) of the upper and lower intermediate portions of the vertical bracket 17a. Between the bifurcated arm 17c, an intermediate portion in the vertical direction of a bell crank-shaped clip lever 21 supported rotatably by a pin 20 is attached. A clip edge 21a for holding the plastic film 8 is provided at the lower end of the clip lever 21, and a sliding portion 21b is provided at the upper end thereof. Note that the clip lever 21 is configured to take either a closed position indicated by a solid line in FIG. 6 or an open position indicated by a two-dot chain line by a compression spring (not shown).
[0006]
On the upper side of the protruding piece 17d, a self-weight support bearing 22 that is a traveling guide bearing is cantilevered rotatably through a horizontal shaft, and the self-weight support bearing 22 is a through-hole (provided in the protruding piece 17d). It arrange | positions so that it may mount on the upper surface 14a of the guide rail 14 through (not shown).
In addition, two upper inner bearings 23 that are traveling guide bearings are rotatably supported by vertical guide shafts at the lower end of the inner tip of the projecting piece 17d. 14 is provided downward at intervals along the line 14. In addition, a single upper outer bearing 24, which is a traveling guide bearing, is cantilevered rotatably via a downward vertical shaft at the lower portion outside the protruding piece 17d. The bearings 24 are arranged to face each other with an appropriate gap across the guide rail 14.
Further, the lower flange portion 16b of the link plate 16 is provided with a receiving base 16d that protrudes inward from this, and a lower inner bearing 25 that is a traveling guide bearing and a lower outer side are provided on the upper surface side of the receiving base 16d. The bearings 26 are cantilevered so as to be freely rotatable via vertical axes, and the lower bearings 25 and 26 are arranged to face each other with an appropriate gap across the guide rail 14.
Therefore, the tenter clip 7 is supported by its own weight support bearing 22 and travels with its lateral movement and posture regulated by the upper bearings 23 and 24 and the lower bearings 25 and 26.
[0007]
[Patent Document 1]
Japanese Utility Model Publication No. 07-36935 [0008]
[Problems to be solved by the invention]
However, the guide rail 14 of the conventional tenter clip traveling device 4 described above corresponds to the straight portion 3a and the curved portion 3b of the guide track 3, as shown in FIGS. A portion 14b is provided. A clearance is provided between the upper bearings 23 and 24 and the lower bearings 25 and 26 and the guide rail 14 so that the tenter clip 7 can smoothly travel on the curved portion 14 b of the guide rail 14. The clearance includes a clearance generated based on an axial tolerance between the bearings of the tenter clip 7 and a manufacturing tolerance in the thickness direction of the guide rail 14.
[0009]
For this reason, in the straight portion 14a of the guide rail 14 as shown in FIG. 7, the tenter clip 7 is inclined toward the grip side of the plastic film 8 by its own weight G during traveling, and the upper bearings 23, 24 and the lower bearings 25, 26 Among them, the upper inner bearing 23 and the lower outer bearing 26 come into contact with the upper and lower side surfaces of the guide rail 14 and rotate by the action of the load pressure, but the upper outer bearing 24 and the lower inner bearing 25 are arranged on the upper and lower side surfaces of the guide rail 14. There is no contact and no rotation. When the tenter clip 7 moves from the straight portion 14a of the guide rail 14 to the curved portion 14b, the chain tension component M acts in addition to its own weight G and centrifugal force F as shown in FIG. The posture changes. Accordingly, the upper and lower inner bearings 23 and 25 are in contact with the upper and lower side surfaces of the guide rail 14, and the upper and lower outer bearings 24 and 26 are not in contact with the upper and lower side surfaces of the guide rail 14. Further, when the tenter clip 7 travels in the reverse direction, the reverse phenomenon occurs, so that the upper bearings 23 and 24 and the lower bearings 25 and 26 come into contact with the guide rail 14 intermittently. When the upper bearings 23 and 24 and the lower bearings 25 and 26 that are not rotating contact the upper and lower side surfaces of the guide rail 14, sliding occurs between them.
Therefore, the conventional tenter clip traveling device 4 has a problem in durability because the guide rail 14 is easily worn. In addition, the wear of the guide rail 14 may be conspicuous in the curved portion 14b where a larger load is applied than in the straight portion 14a.
[0010]
The present invention has been made in view of such a situation, and an object of the present invention is to improve durability and reduce costs by suppressing slippage of the travel guide bearing and reducing wear of the guide rail. An object of the present invention is to provide a tenter clip travel device for a film stretching machine.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art, in the present invention, a clip body including a plurality of travel guide bearings and traveling while gripping a film, and travel of the clip body is performed via the guide bearings. In the tenter clip travel device of a film stretching machine provided with a guide rail for guiding, the thickness of the guide rail is gradually increased with respect to the basic thickness, and the downstream side is gradually decreased. The rail part formed in the original basic plate thickness is partially provided.
[0012]
Moreover, in this invention, it is preferable that the rail part of the said guide rail is provided with elasticity.
And in this invention, the rail part of the said guide rail is a curved part, and plate | board thickness is gradually thick with respect to basic | foundation board | plate thickness in the vicinity of the entrance of this curved part, and the curved part of the said curved part located in the back flow side. In the vicinity of the outlet, it is preferable that the plate thickness is gradually reduced to the original basic plate thickness. Alternatively, in the present invention, the rail portion of the guide rail is a part of a straight portion, and the thickness of the guide portion gradually increases with respect to the basic plate thickness in the vicinity of the entrance of the straight portion, and the straight line located on the downstream side thereof. In the vicinity of the outlet of the part, it is preferable that the plate thickness is gradually reduced to the original basic plate thickness.
[0013]
Furthermore, in the present invention, it is preferable that the rail portion of the guide rail is formed in an H-shaped section having elasticity.
And in this invention, it is preferable that the rail part of the said guide rail is formed using the member of an integral structure. Alternatively, in the present invention, the rail portion of the guide rail is preferably formed by a plurality of strip plate members and spacers arranged between the strip plate members in the plate thickness direction.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a tenter clip traveling device of a film stretching machine of the present invention will be described in detail based on the illustrated embodiments. Here, FIG. 1 is a conceptual plan view showing a curved portion of a guide rail in a tenter clip traveling device of a film stretching machine according to an embodiment of the present invention, and FIG. 2 is a tenter clip of the tenter clip traveling device according to the present embodiment. The conceptual front view which shows a guide rail, FIG. 3 is sectional drawing which shows the structure of the guide rail in FIG. In the embodiment of the present invention, the same parts as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.
[0015]
As shown in FIG. 1, the guide rail 14 of the tenter clip traveling device 4 in the film stretching machine according to the embodiment of the present invention gradually increases the plate thickness T with respect to the basic plate thickness T ₁ and increases the plate thickness T _2. (T ₂ > T ₁ ), and the rail portion formed to the original basic plate thickness T ₁ by gradually reducing the downstream side is partially provided.
As such a rail portion of the guide rail 14, for example, there is a curved portion 14 b from the stretching start position 9 to the stretching end position 10 (see FIG. 5). In the curved portion 14 b, the upper bearings 23 and 24 and the lower bearing are provided. The load applied from the tenter clip 7 traveling through 25 and 26 is larger than that of the straight portion 14a. Then, the curved portion 14b in the vicinity of the inlet A, the thickness T ₂ becomes gradually thicker plate thickness T relative to the thickness T ₁ of the basic linear portion 14a, the curved portion 14b located on the subsequent downstream In the vicinity of the outlet B, the plate thickness T is gradually reduced to the plate thickness T ₁ of the original basic straight portion 14a.
[0016]
Further, the curved portion 14b of the guide rail 14 is given elasticity. That is, as shown in FIGS. 1 to 3, the curved portion 14 b of the guide rail 14 is formed in an H-shaped section having elasticity, and the self-weight support bearing 22 utilizes elastic deflection while the tenter clip 7 is running. By applying a preload to the other upper bearings 23 and 24 and the lower bearings 25 and 26 except for, the rotation of the bearings 23, 24, 25 and 26 is facilitated.
[0017]
For this reason, the curved portion 14b of the guide rail 14 includes two strips 30 and 31 of inner and outer portions which are rolled steel sheets, and a spacer 32 disposed between the strips 30 and 31 in the thickness T direction. And are bolted in a state where they are stacked. In addition, the vertical dimension of the spacer 32 is smaller than that of the strips 30 and 31, and a gap between the strips 30 and 31 in the thickness T direction increases the elasticity of the curved portion 14b. Is provided.
Further, in the curved portion 14b of the guide rail 14, the plate thickness T of the curved portion 14b is changed to the plate thickness T ₁ near the inlet A by changing the thickness of the spacer 32 to be used according to the installation location. The plate thickness T in the middle is increased to the plate thickness T _2, and the plate thickness T in the vicinity of the outlet B on the downstream side is further reduced to the plate thickness T ₁ . In addition, in order to gradually increase or decrease the plate thickness T of the curved portion 14b, both side surfaces of the spacer 32 disposed near the inlet A and the outlet B are on one end side in a plan view as shown in FIG. It is formed in the wedge shape which inclines toward.
[0018]
In the tenter clip traveling device 4 of the film stretching machine according to the embodiment of the present invention, even if a clearance is provided between the upper bearings 23 and 24 and the lower bearings 25 and 26 of the tenter clip 7 and the guide rail 14, the guide The thickness T of the curved portion 14b of the rail 14 is gradually increased with respect to the thickness T ₁ of the basic straight portion 14a at the intermediate portion from the vicinity of the inlet A toward the wake side, and the thickness T ₂ is obtained. from toward the rear stream side of the outlet near the B further gradually decreases to the basic straight portion 14a because of the plate thickness T _1, the tenter clip 7 for traveling straight portion 14a of the guide rail 14 of the curve portion 14b When guided to the vicinity, a preload that promotes rotation is applied to the upper bearings 23 and 24 and the lower bearings 25 and 26.
[0019]
Therefore, in the tenter clip traveling device 4 of the present embodiment, slippage between the upper bearings 23 and 24 and the lower bearings 25 and 26 of the tenter clip 7 and the curved portion 14b of the guide rail 14 is suppressed, and these bearings 23 and 24 are suppressed. , 25 and 26 can be rotated, so that wear of the guide rail 14 can be reduced and durability can be improved. In addition, the curved portion 14b of the guide rail 14 of the present embodiment has an H-shaped cross section by the strip plate materials 30 and 31 on the inner and outer sides and the spacer 32 disposed between the strip plate materials 30 and 31 in the plate thickness T direction. Therefore, the elastic deflection of the guide rail 14 can be fully utilized. As a result, the preload can be smoothly and reliably applied to the bearings 23, 24, 25, and 26.
[0020]
FIG. 4 is a cross-sectional view showing the structure of the curved portion of the guide rail in the tenter clip traveling device of the film stretching machine according to another embodiment of the present invention.
The guide rail 34 according to the embodiment of the present invention is different from the guide rail 14 according to the embodiment described above in that the curved portion is formed by using an integral structure member as shown in FIG. That is, the guide rail 34 according to the present embodiment includes inner and outer vertical pieces 35 and 36, and a horizontal piece 37 that is provided at a central position in the vertical direction of the vertical pieces 35 and 36 and extends in the plate thickness T direction. The cross section is formed in an H shape.
Along with this, vertical grooves 38 are formed between the vertical pieces 35 and 36 in the plate thickness T direction and at the vertical positions of the horizontal pieces 37, respectively, and the elasticity of the guide rail 34 is as follows. It is comprised so that it may change with the width dimension of the vertical groove 38. FIG. Of these vertical pieces 35, 36, the thickness Ta of the vertical piece 35 on the side where the upper bearings 23, 24 and the lower bearings 25, 26 abut is the side where these bearings 23, 24, 25, 26 do not abut. The vertical piece 36 is thicker than the plate thickness Tb (Ta> Tb), and the elastic deflection of the guide rail 34 is easily utilized. Other configurations and operations are the same as those in the above embodiment.
[0021]
In the tenter clip traveling device 4 according to the embodiment of the present invention, the curved portion of the guide rail 34 is formed by using an integral structure member, so that the same effect as that of the above embodiment can be obtained and the guide rail can be obtained. 34 can be easily manufactured.
[0022]
While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.
For example, in the tenter clip traveling device 4 of the present embodiment, a special structure is applied to the curved portion 14b of the guide rail 14, but this special structure can also be applied to a part of the straight portion 14a. According to this, when the tenter clip 7 travels on the linear portion 14 a having a special structure of the guide rail 14, preload is applied to the bearings 23, 24, 25, 26 and rotation is promoted. Even when the vehicle travels on the curved portion 14b, slipping between the guide rail 14 and the guide rail 14 is suppressed, and wear of the guide rail 14 can be reduced.
[0023]
【The invention's effect】
As described above, the tenter clip travel device of the film stretching machine according to the present invention includes a plurality of travel guide bearings and travels by gripping the film and travels of the clip body. The guide rail is provided with a guide rail, the thickness of the guide rail is gradually increased with respect to the basic thickness, and the downstream side is gradually reduced to the original basic thickness. Since the rail part formed in the plate thickness is partially provided, it is possible to suppress the sliding of the guide rail for traveling and reduce the wear of the guide rail. As a result, the durability and cost of the traveling device are improved. You can go down.
[Brief description of the drawings]
FIG. 1 is a conceptual plan view showing a curved portion of a guide rail in a tenter clip travel device for a film stretching machine according to an embodiment of the present invention.
FIG. 2 is a conceptual front view showing a tenter clip and a guide rail in a tenter clip travel device for a film stretching machine according to an embodiment of the present invention.
3 is a cross-sectional view showing the structure of the guide rail in FIG. 1. FIG.
FIG. 4 is a cross-sectional view showing the structure of a guide rail in a tenter clip travel device for a film stretching machine according to another embodiment of the present invention.
FIG. 5 is a conceptual plan view showing a conventional film stretching machine.
6 is a perspective view taken along line CC in FIG.
FIG. 7 is a conceptual front view showing a state of a tenter clip at a straight portion of a guide rail in a tenter clip traveling device of a conventional film stretching machine.
FIG. 8 is a conceptual front view showing a state of a tenter clip at a curved portion of a guide rail in a tenter clip traveling device of a conventional film stretching machine.
[Explanation of symbols]
3 Guide Track 4 Tenter Clip Traveling Device 7 of Film Stretcher 7 Tenter Clip 8 Plastic Film 14 Guide Rail 14a Straight Line 14b Curved Section 15 Pressing Plate 16 Link Plate 16b Lower Flange 16d Receiving Base 17 Clip Plate 17b Clip Base 18 Clip Body 19 Link pin 21 Clip lever 22 Self-weight support bearing 23 Upper inner bearing 24 Upper outer bearing 25 Lower inner bearing 26 Lower outer bearing 29 Chain 30, 31 Strip plate material 32 Spacer 34 Guide rail 35, 36 Vertical piece 37 Horizontal piece 38 Vertical groove A Inlet B Exit T Thickness

Claims (7)

  A tenter clip for a film stretching machine comprising a plurality of travel guide bearings, and a clip body that grips and travels the film, and a guide rail that guides the travel of the clip body through the guide bearings. In the traveling device, the guide rail is partially provided with a rail portion formed to have the original basic plate thickness by gradually increasing the plate thickness with respect to the basic plate thickness and then gradually reducing the flow side. A tenter clip travel device for a film stretching machine.   The tenter clip travel device for a film stretching machine according to claim 1, wherein the rail portion of the guide rail is provided with elasticity.   The rail portion of the guide rail is a curved portion, and the plate thickness gradually increases with respect to the basic plate thickness near the entrance of the curved portion, and the plate thickness gradually increases near the exit of the curved portion located on the downstream side. The tenter clip travel device for a film stretching machine according to claim 1 or 2, wherein the tenter clip travel device is formed to have an original basic plate thickness.   The rail portion of the guide rail is a part of the straight portion, and the plate thickness is gradually thicker than the basic plate thickness near the entrance of the straight portion, and the plate is near the exit of the straight portion located on the downstream side. The tenter clip travel device for a film stretching machine according to any one of claims 1 to 3, wherein the thickness is gradually reduced to be the original basic plate thickness.   The tenter clip traveling device for a film stretching machine according to any one of claims 1 to 4, wherein the rail portion of the guide rail is formed in an H-shaped section having elasticity.   The tenter clip travel device for a film stretching machine according to claim 5, wherein the rail portion of the guide rail is formed using a member having an integral structure.   6. The film stretching machine according to claim 5, wherein the rail portion of the guide rail is formed by a plurality of strips and spacers arranged between the strips in the thickness direction. Tenta clip travel device.

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