JPH0441354A - Tension providing device for tenter clip - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tensioning device for a tentaclinop that can be used in a transverse stretching machine for plastic film and a tenter for fabric.

(Prior art) Fig. 7, Fig. 8, Fig. 9, and Fig. 10 are conventional art
The transverse stretching machine proposed in the -53814 publication is shown.

In FIG. 7, the left side is the entrance side of the film (not shown), and the right side is the exit side, and a pair of endless roller chains (not shown) each run on an outbound path 1 and a return path 2, and between the outbound path A crimp provided on this grips the film. Then, as shown in the figure, the roller chain stretches the film laterally by widening the gap between the pairs in the middle of the run.

Further, the roller chain is guided by a driven wheel 3 on the inlet side to change direction and perform tension control, and is driven by a drive sprocket 4 on the outlet side. The drive sprocket 4 is of the usual type with teeth, and the driven wheel 3 is a normal sprocket with teeth, or, unlike the usual one, a disc without teeth. The driven wheel 3 and its vicinity will be explained below with reference to FIGS. 8 and 9.

FIG. 8 is a sectional view of the driven wheel 3 shown in FIG. 7, which is attached via a key 10 to a shaft 9 supported by bearings 7 and 8 fitted into a cover 6. The middle part is supported by the cover 6 by a bearing 11, and the roller chain 12 is guided around the outer periphery. The outer periphery of this driven wheel 3 is surface-hardened, and it is advantageous to increase its diameter to increase the contact area with the roller chain 12 in terms of wear resistance, and also to prevent centrifugation during high-speed U turns. It is also advantageous for reducing force. Note that the cover 6 is fixed to the lower main rail I3.

FIG. 9 is a detailed view of the Z part in FIG. (see Figure 7), and a pin 22 penetrating through the center has a clip main body 2.
3 is installation. A pin 24 fixed to the left end of the clip body 23 rotatably supports a support 26 to which a clip 25 is attached, and a dog 27 is fixed above the support 26.

The crimp 25 is shown gripping a film (not shown), and the clip 25 is attached to the roller chain 12.
Accordingly, when traveling on return route 2 in Figure 7, dog 2
7 comes into contact with a cam (not shown), so that the clip 25 is in a position rotated counterclockwise from the state shown in the drawing.
When the clip 25 in this state advances to the forward path 1 in FIG. 7, the dog 27 is rotated by the cam to the illustrated position, so that the clip 25 grips the film.

The clip body 23 has a roller 31 rotatably supported by a pin 30 fixed above the clip body 23, which is in contact with the upper surface of the clip rail 32 fixed to the end of the cover 6.
Its weight is supported.

On the other hand, rollers 35 and 3 are rotatably supported by pins 33 and 34 fixed to approximately the center and right end of the clip body 23.
6 is in contact with both sides of the clip guide 32, and the roller 38 rotatably supported by a pin 37 fixed below the clip body 23 is attached to the side surface of the clip guide 40 fixed to a frame 39 attached to the main rail 13. By coming into contact with each other, the horizontal movement of the crimp body 23 is restricted.

However, during actual operation, the position of the driven sprocket 3 is adjusted to apply tension to the roller chain 12 to prevent lateral movement. Only.

(Problems to be Solved by the Invention) In the conventional device described above, tension is applied to the roller chain by the driven wheel 3. Therefore, when increasing the speed of the tenter, the driven wheel 3 and the roller chain are separated at the entrance. The sound generated when the tenters engage or come into contact becomes louder, and this becomes a factor in the aim of increasing the speed of the tenter. Also, driven wheel 3
It is necessary to rotatably support the roller chain on the rail 13, which not only complicates the structure, but also causes the driven wheel 3 to get in the way when applying tension to the roller chain. Since tension cannot be applied on the line (the center in the thickness direction of the driven wheel 3), a rotational moment is generated in the tension applying device (the driven wheel is attached), resulting in a loss of tension.

Furthermore, when the crimp completes its turn from the inbound path to the outbound path at the entrance and leaves the driven wheel, a large force acts on the rail 32 because it is swung outward by centrifugal force during the turn. That is, as shown in FIG. 10, the running direction is changed by the route of linear guide rail 80→circular guide rail 81→straight guide rail 80. At this time, the centrifugal force (-rw") and drastic changes occur in the parts where the line changes from a straight line to a circular arc and from a circular arc to a straight line. As a result, noise is generated during high-speed operation, and the contact area between the support roller and the guide rail. There were problems such as wear and a shortened life of the support roller.

The present invention has been proposed to solve the above-mentioned conventional problems.

(Means for Solving the Problems) Therefore, the present invention provides a tenter apparatus having a semicircular roller guide rail for guiding the running of a clip chain at a turn portion on the entrance side of a tenter, and a supporting stand for the semicircular roller guide rail. The crimp is pushed toward the entrance side via the crimp bearing, thereby applying tension to the clip chain, and this is a means to solve the problem.

(Function) The semi-circular roller guide rail pushes the clip toward the entrance via the clip's bearings, applying tension to the clip chain, making it possible to eliminate the need for a driven wheel. Further, by applying tension to the clip chain by pushing the semicircular roller guide rail on the line of action, no rotational moment is generated in the tension applying device.

(Example) The present invention will be described below with reference to the embodiments shown in the drawings. Figures 1 to 6 show examples of the present invention, in which the present invention is implemented in a tenter clip attachment/detachment device for a plastic film biaxial stretching machine. The first part is a plan view, the second part is a sectional view from A to A in Figure 1, the third part is an enlarged view of part B in Figure 2, and the fourth part is a clip chain guide rail connection part. FIG. 5 is an exploded perspective view of FIG. 4.

In the figure, 41 is a frame that supports the traveling part of the clip chain 60, 42 is a semicircular guide rail of the clip chain 60, and the rail support plate 44 and the support base 45 are used to support the moving platform 4.
It is fixed at 8. 43 is a linear guide rail for the clip chain 60. A clip opener 46 is fixed to a movable table 48 by a support table 47. 49 is a rotary table, and a shaft 50 fixed to this with a bolt 52 is fitted into a bearing of a frame 41 and is stopped by a stop plate 51. The lower end of the shaft 50 is made into a square shaft, and a wrench is placed on this shaft when it is desired to turn the turntable 49. 58 is the turntable 49
It is a flat bearing that supports the In addition, there are two
A pair of support shafts 59 supported by bearings 57 are attached, and the support shafts 59 are fixed by the bearings 57, and a bearing stand 56 fitted with a flat bearing that can slide on the support shafts 59 is attached. It is attached to a moving table 48.

54 is a cylinder support stand attached to the frame 41;
The other cylinder support base 55 is attached to the movable base 48, and the semicircular guide rail 42, clip chain 60, and crimp opener 46 attached to the movable base 48 rotate together with the movable base 48 by the action of the hydraulic cylinder 53. It can be moved on a platform 49. Further, the center line of the hydraulic cylinder 53 is aligned with the center of the semicircle of the semicircular guide rail 42, and the hydraulic cylinder 53 is aligned with the semicircular center of the semicircular guide rail 42.
When pushing out the clip chain 60, unnecessary force is not applied to surrounding members so that no moment is generated.

FIG. 3 shows details of the clip chain 60, in which 61 is a clip base forming a chain link, 62 is a chain roller, and 63 is a chain link pin, which forms a bolt and is screwed to the clip body 64. 67 is the chain link, 64 is the clip body, and the clip lever 65
is supported by a lever pin 66. Further, rollers 68, 69, 70, 71, 72, and 73 are rotatably supported by upper and lower arms extending from the clip stand 61.
The clip chain 60 is attached so as to surround the top, bottom and sides of the semicircular guide rail 42 .
It functions to surely eliminate the wobbling of the clip base 61 along the semicircular guide rail 42 when traveling on it. 74 is a connecting pin, and 75 is a cotter pin for preventing removal.

Figure 4 is a detailed view of part 0 in Figure 1, showing the semicircular guide rail 4.
2 and the connecting portion of the linear guide rail 43 is shown.

FIG. 5 shows an exploded view of FIG. 4, and 76 is a rail support plate which serves to fix the linear guide rail 43 to the frame 41. Reference numeral 77 denotes a support fitting that supports the connecting portion of the guide rail 4243. In addition, as shown in FIG.
At 8, insert the rail support plate 7 through the support fitting 77 and the spacing cylinder 79.
Tighten to 6.

Note that the semicircular guide rail 42 is only inserted into the space 43a and is not fixed.

With the above structure, the hydraulic cylinder 53 moves the semicircular guide rail 4 through the movable table 48, the abutment 45, and the rail support plate 44.
2 is supported by crimp rollers 68 and 71 on the inlet side (E
By pushing in the direction of the arrow), tension can be applied to the clip chain 60. Semicircular guide rail 4 at that time
Paying attention to the running behavior of the clip above 2, in FIG. 6, the clip main body runs on a linear trajectory on the linear guide rail portion 42-1.

At point A in the figure, the linear guide rail section 42-1 is connected to a clothoid curve or a curved guide rail section 422 approximating it, the clip body 64 travels drawing a clothoid locus, and the direction of the clip body 64 is changed in units from the linear direction. The direction of the clip changes at a constant angle per time, and the centrifugal force (-rlW,'') acting on the clip body 64 gradually increases until the direction of the clip approaches the angle at which it touches the arcuate guide rail section 42-3, and The force also reaches -rw'' in the figure. The clip moves along an arcuate trajectory on the arc guide rail section 42-3,
At point C in the figure, it moves to the curve guide rail section 42-4 of the clothoid curve opposite to the entrance side. Curved guide rail section 4
2-4 is connected to the linear guide rail portion 42-1 at point D. Note that the curved guide rail formed by a clothoid curve or an approximate curve thereof may be used for the entire turn part of the clip, in addition to the side where the clothoid curve is partially used, such as clothoid-arc-clothoid. Moreover, a linear guide rail may be interposed in the middle instead of the arcuate guide rail.

(Effects of the Invention) As explained in detail above, the present invention has a structure in which tension is applied to the clip chain using semicircular roller guide rails, thereby eliminating the need for a driven wheel, thereby reducing noise. In addition, since the structure is simplified, it is possible to reduce manufacturing costs, reduce the probability of trouble occurring, and facilitate maintenance. Further, according to the present invention, since the clip is pushed toward the inlet side via the bearing of the clip on the line of action by the semicircular roller guide rail, no rotational moment is generated in the device and no loss of tension occurs. Note that if a clothoid curve or an approximate curve thereof is used for the path of the semicircular roller guide rail, sudden changes in the centrifugal force of the clip can be avoided, and the movement trajectory of the clip at the entrance will be smooth, and the -layer It is possible to reduce the noise of the guide rail, prevent abnormal wear of the guide rail, and extend the life of the support roller of the clip.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the inlet of a tensioning device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
FIG. 4 is an enlarged perspective view of the guide rail connection part showing one embodiment of the present invention, FIG. 5 is an exploded perspective view of FIG. 4, and FIG. 6 is a semicircular guide of the present invention. Explanatory diagram of the rail, No. 7
The figure is an overall plan view showing a conventional transverse stretching machine, Figure 8 is a sectional view of the driven wheel in Figure 7, Figure 9 is a detailed view of the Z section in Figure 8,
FIG. 0 is an explanatory diagram of a conventional entrance semicircular guide rail. Explanation of the main parts of the figure 42 =... - Semicircular roller guide rail 44 - Rail support plate 48 to moving platform 53 - Hydraulic cylinder 57 - Bearing 60 - Clip chain 64 - Clip body 68 to 73 - Bearing JP11 Figure 4 Figure 5! /PJ6 figure qth

Claims (1)

[Claims] In a tenter device that has a semicircular roller guide rail that guides the running of a clip chain at the turn section on the entrance side of the tenter, and a supporting stand for the semicircular roller guide rail, the semicircular roller guide rail pushes the clip toward the entrance side through the bearing of the clip, and the clip A tensioning device for a tenter clip, which is characterized by applying tension to a chain.