JPS61160616A - Sheet-shaped clip device - 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 sheet-like object clipping device, and typically relates to a sheet-like object clipping device for gripping a thermoplastic synthetic resin film or the like.

More specifically, improvements have been made particularly in the gripping ability of sheet-like materials, and sheet-like materials have been developed that can be optimally used as a means for gripping films in simultaneous biaxial stretching equipment used, for example, in the production of thermoplastic synthetic resin films. This invention relates to an object clip device.

(Prior Art) Conventionally, as a film gripping means in the above-mentioned simultaneous biaxial film stretching apparatus, a specially devised gripping clip mechanism is required because stretching forces are applied to the film from two directions at the same time. , for example, Special Public Interest Publication No. 45-3
A two-stage film clip device such as that proposed in Japanese Patent No. 9478 is used.

FIG. 4 and FIG. 5 are for explaining the outline of the two-stage film clip device, and the features of the two-stage film clip device will be listed and explained using these figures. , the two-stage film clipping device applies a stretching force φ in the X direction (horizontal direction) shown in FIG. 11 is clamped and held by an upper grip 3 provided to engage with the lever member 2 and a lower grip 4 provided on the clip device main body 1, and (a) the clip The lever member 2 is rotatable with respect to the device main body 1 about a fulcrum 01, and on the other hand, the upper grip member 3 is rotatable with respect to the lever member 2.
is rotatable about the fulcrum 02, that is, there are two points 01 and 02 as fulcrums that can freely rotate, so that the film can be gripped by the "plane". Here, in FIG. 4, 5 is a lever shaft, and 6 is a pin, which form their respective rotation axes.

As a result, the stress state can be uniform no matter which direction the stretching force is applied, making it possible to stretch the film uniformly, which is why it is often used in simultaneous biaxial stretching machines that apply stretching forces from two directions simultaneously. be.

(b) In general, in order to grip the film reliably and stably, a spring 12 is attached to maintain a constant relative rotation angle between the upper gripping body 3 and the lever member 2 when the upper and lower gripping bodies are not in contact with each other; Thus, the upper gripping body 3 is configured to start gripping the film with the gripping surface always facing upward on the film side.

At this time, the upward angle is regulated by interfering the locking part 7 at the lower end of the lever member 2 with the upper grip 3, as shown in FIG.

(c) Furthermore, by pulling the lever member 2 with the tension spring 13 shown in FIG. 4, the gripping force is improved and the vertical direction (direction of film travel) where the self-tensioning effect does not work.
Even when a stretching force is applied, the film can be gripped well.

Under such a configuration, the film 11 is attached to the upper grip body 3
The clip device main body 1 engages with the traveling body 10 and grips the film while traveling in a predetermined section. Thus, the film is subjected to the desired stretching action while being continuously run.

Furthermore, when starting to hold the film during stretching and when releasing the film at the end of stretching, the guide 9 shown by the dashed line in FIG. roller 8 provided
are configured to engage with each other, and by properly setting this engagement relationship and rotating the lever member, the upper grip body 3 can be pulled up or down. gripping and releasing.

Furthermore, as shown in FIG. 6, the lever member 2 is in a state where it can be handled as if it were in a state that is opposite to the state shown in FIGS. 4 and 5, that is, a straight line connecting points 01 and 02. 0102 passes through the point 01 and the vertical line 01E perpendicular to the surface of the lower gripping body, it is no longer possible to grip the film. If the film thickness is ignored as extremely thin, the lower support portion 14, upper support portion 15, upper and lower grips, etc. of the main body 1 shown in FIG. 4 are combined to form L-4.
−4−cosθmin −M(1−cosθ1lIin) ・It is impossible unless at least a deformation of the length L expressed by (1) occurs, where α is the distance between O1 and 02,
θ is the angle between the straight line 0102 and the above-mentioned vertical line OtE, and θmin is the lever angle (minimum lever angle) when the upper and lower gripping body surfaces are in direct surface contact. Therefore, θmi
If n is set to an appropriate value so that the value of L is appropriately large, deformation by that amount is only possible with a large force, and as a result, the element of the lever member as described above is This is what is to be prevented.

(Problems to be solved by the invention) By the way, even in such a two-stage clip mechanism,
Its gripping ability essentially has the following disadvantages.

That is, the mainstream of film production is low-volume, high-mix production, and in order to accommodate this, it is necessary to grip films with a wide range of thickness with one type of clip.

However, when it is necessary to grip a thick film, the two-stage clipping device is limited in the thickness range that can be gripped well, and if it is not possible to grip a film over a certain thickness, it will no longer be possible to grip it. - A general type clip device, such as the one described in Japanese Patent Publication No. 58-40502, etc., does not produce a self-tensioning effect but causes problems such as being able to handle the film from the clip. Compared to the above case, the thickness range that can be gripped well is about 1/2 to 1/3 or less.

Here, the gripping thickness range H that can be gripped by self-tensioning is determined by the maximum lever angle θmax that can be gripped, which depends on the friction coefficient μ between the upper and lower gripping surfaces, and the lever angle (minimum lever angle) when the upper and lower gripping surfaces make surface contact. Determined by θmin, H=4−cosθIn1n −(1−cosθmax=
4 (cosθakin −cosθmax) −
<2).

Generally, there are various methods as described below to widen the gripping thickness range of a two-stage clip device. That is, (a) serrations (grooves) or the like are provided on the surface of the gripping body to increase the coefficient of friction on the surface, thereby increasing θmax.

(b) From the relationship in equation (2), configure so that Q is as long as possible.

(c) Construct so that θmin is as small as possible.

(d) Multiple types of parts (lower grip body and/or
(or lower gripping body) are prepared, and these are appropriately replaced and used depending on the thickness of the film to be gripped.

There are other means such as

However, these means also have the following problems. That is, in the case of (a), stress concentration occurs in the film at the serrations, making the film extremely susceptible to tearing compared to the case where no serrations are provided. Also,
According to the findings of the present inventors, by providing the serrations, the gripping thickness range increases by about 50%, but no further dramatic increase can be expected. Also, in the case of (b),
In order to increase the gripping thickness range by n times, it is necessary to increase the length of α by n times, which increases the size and weight of the device. The driving force is also large, which is not practical. In addition, in the case of (c), the gripping thickness range becomes somewhat wider, but on the other hand, if θmin is decreased, the value of 0 shown in the above equation (1) becomes smaller, and the lever member is not easily handled. This becomes more likely to occur, and the force of pressing due to the wedge effect increases, so the prevention effect of bare handling becomes small. Also,(
In the case of (d), if the range of film thickness that can be gripped is O≦t≦t 111ax, then the length of the upper gripping body is
Alternatively, by reducing the length a2 of the lower gripping body by a, that is, by creating a parallel gap amount a from the original state between the upper and lower gripping bodies, so that a gap is generated at the gap a,
By making it possible to grip within the range of t where a≦t≦(tmax+a>), and roughly by preparing and replacing various gripping bodies with stepwise differences in a, it is possible to grasp the gripping thickness within the same range as a general type clip. However, in this case, by providing the parallel plow wholesaler a, the deformed scale to prevent the raw handling shown in equation (1) above is When gripping the film fails due to the value decreasing to (L-a>) or in a section where the film is not gripped, the lever member is likely to become loose. When trying to obtain such a large gripping thickness range, the value of (L-a) may be negative, that is, larger than the parallel plow wholesaler alfiL, and in that case, the lever member will not work properly without the film. Without any obstacles, it will be possible to reach the central prefectural state as shown in Figure 6.

In the cases of (c) and (d), if the lever member is tilted to the center, the following problems will occur. In other words, the guide 9 that restricts the engagement of the lever member exists only in a small area when gripping the film is started and when it is released, and is not present in other parts. The lever member rotates freely during most of the travel, and is connected to the traveling body that runs the clip or the regulation guide 9 of the traveling body.
may cause significant damage. Of course, it is no longer possible to control the gripping and release of the film by the guide 9 with the lever member that moves freely in this way, and as a result, normal stretching will no longer be possible at all. . On the other hand, in order to restrict the movement of the lever member over the entire traveling section, there is a method of providing guides 9 over the entire traveling section, but in this case, the rollers 8 and guides 9 of all clips are in substantially constant contact with each other. However, due to the increase in running resistance, it is not possible to increase the speed and reduce the driving force, and a large amount of oil is used to lubricate the rough contact parts, resulting in the problem of oil scattering onto the film. The installation requires extremely large-scale equipment, and there are many practical inconveniences.

From the above points, in order to widen the gripping thickness range of the two-stage clip mechanism, it is necessary to create a structure that does not cause the occurrence of rough handling of the lever member, and to improve the high-speed running performance of the clip.
It is important to do this in such a way that the driveability is not impaired at low driving forces, and in view of this, the object of the present invention is to provide a novel sheet-like object clip with improved clip gripping performance. The aim is to provide the equipment.

(Means for Solving the Problems) A sheet-like object clipping device of the present invention that achieves the above object has the following configuration.

That is, it consists of a lever member rotatable around a point 01 on the main body, an upper grip body rotatable around a point 02 on the lever member, and a lower grip body provided on the main body. In a sheet-like object clipping device in which the upper gripping body and the lower gripping body come into surface contact with the sheet-like object and grip the sheet-like object under pressure by rotating a lever member, the sheet-like object is held downward in the direction in which the sheet-like object should be gripped. In the process of rotating the lever member, the straight line connecting the 01 (!:02)
This sheet-like object clipping device is characterized in that it is provided with a stopper that can restrict further rotation of the lever member in a state in which the lever member passes through a straight line perpendicular to the surface of the lower gripping body through Ql.

In a preferred embodiment of the sheet-like object clipping device of the present invention, a stopper portion is provided on the lever member, and the stopper is configured such that the upper grip body and the lower end portion of the lever member interfere with each other. Alternatively, the stopper portion is provided on the main body or the lever member, and the stopper is configured such that the lever member and the main body interfere with each other. .

Further, as is clear from the above description, the sheet-like material clipping device of the present invention is particularly preferably used as a film gripping clip in a simultaneous biaxial stretching device in a film manufacturing process, for example.

(Function and Examples) The clip device of the present invention is intended to restrict the rotation of the lever before the lever member is moved to the center, and to prevent the lever member from being handled easily. Based on the following, the sheet-like object clipping device of the present invention will be roughly explained in detail.

FIG. 1A is a schematic diagram showing an embodiment of the clip device of the present invention, in which the lower end of the lever member 2 is cut into two surfaces, surface A and surface B, in a substantially straight line.

As described in Japanese Patent Publication No. 45-39478, surface A is a locking portion that regulates the posture of the upper grip when the lever member is pulled up, and surface B is a locking portion that regulates the posture of the upper grip body when the lever member is pulled up. It constitutes a stopper part for prevention. The mechanism for preventing rearward movement by the surface B is such that when the lever member 2 is rearwardly moved, the upper grip body 3
This is done by taking advantage of the relative rotation of the clockwise.

That is, when the amount a of the above-mentioned upper and lower grip body lengths al and α2, that is, the parallel gap a is larger than the deformation ML of the lower support portion of the main body and the grip body, there is no film. In this case, since the upper and lower grip surfaces do not make surface contact and are pushed upward by the spring 12, the lever member is moved counterclockwise while making point contact as shown in FIGS. 1B and C. As the upper grip body 3 rotates, it moves in the X direction. At this time, in order for the upper grip body 3 to move in the X direction until the lever member is centered, the upper grip body 3 must be in the state shown in Figure 1B with respect to the lever member, as shown in Figure 1C. However, due to the rotation of the lever, the portion 16 of the upper grip member 3 on the side opposite to the grip surface is brought into contact with the surface B of the lever member as shown in FIG. 1C. In order to interfere with
Relative rotation is restricted at a certain point before the lever member reaches the center, and further rotation is impossible.

As a result, if the angle of the straight line O1D with respect to the vertical line passing through point 01 and perpendicular to the lower grip body surface in the state when relative rotation is regulated is φ, then The amount of deformation of the support portion 14, etc. is no longer the value shown in the above equation (1), but is expressed as L"=α'-α'・COSφ=Q-(1-cosφ)...(3) L expressed
'. Here, a- is the distance between 01 and 0.

Comparing Equation (3) and Equation (1), the values of α-1φ are both considerably larger than the values of a and θ1llin, so the amount of deformation L' is larger than that of the gap a. This becomes a sufficiently large value, and as a result, a huge force is required to cause the lever member to become centered, which can be effectively prevented after one action.

Here, the value of φ and the lever angle θ when the lever member is restricted from rotating are the diameter d of the upper grip, the distance between the portion 16 of the upper grip on the side opposite to the grip surface and the lever member surface 8. This is determined by the parallel distance b and the length Ql of the upper gripping body. Normally, d is a constant value, roughly 01
is a value that should be changed depending on the gripping thickness range, so it is practical to adjust θ1 and φ by appropriately setting b. By the way, if b is kept constant, θ[, φ will change as D,1 changes, but even if α1 changes, if the value of θ, etc. remains within the regulatory range, then b needs to be changed. There isn't. On the other hand, if you want to keep θ and φ constant, then change b as you change al.
All you have to do is change it. The above is based on the lower grip body length being 0.
．． This also applies to the case where 2 is changed depending on the gripping thickness range.

Also, the range of θL is based on the vertical line in Fig. 1, and if the clockwise direction is positive, then if the lever member can return, then
That is, if φ>0, θ.

([ can be either positive or negative.

Furthermore, the shape of the surface B does not have to be substantially straight, and may be, for example, a curve such as a quadratic curve.

The device of the present invention as described above prevents bare handling when the upper and lower gripping surfaces are in surface contact, that is, the parallel gap a is deformed! This is effective even when the lever angle is smaller than L, and even when the minimum lever angle θmin is quite small, the conventional problem of easy handling of the lever member can be almost eliminated.

2 and 3 are schematic diagrams showing other embodiments of the sheet-like material clipping device of the present invention, respectively. 1 shows a lever member provided with a stopper 18, and in both cases, the lever member and the clip device main body are configured to interfere with each other. In such an embodiment, the regulation angle θL is determined by the position where each stopper is provided, and in this case, if the stopper position is configured to be changed as appropriate by tightening bolts with elongated holes, θ[ can be made variable. is possible and practical. When such a stopper as shown in FIGS. 2 and 3 is provided, the restriction angle θ of the lever member can be arbitrarily set without being influenced by the shape of the upper grip member or the like.

According to the present invention described above, even if the film is handled during film stretching or an abnormally large force is applied to the clip device, the lever member will not become loose.

Furthermore, the clip device to which the present invention is applied can also be used as a gripping device for a stretching device that operates only in the horizontal or vertical direction.

(Effects of the Invention) According to the sheet-like object clipping device of the present invention as described above, the following excellent effects can be obtained.

In other words, in a two-stage clip, in order to widen the gripping thickness range, the parallel gap between the upper and lower gripping body surfaces is increased, or the minimum lever angle is set small.
By regulating the rotation of the lever member □, it is possible to effectively prevent centering.

According to the clip device of the present invention, the device can be enlarged,
Since this can be easily prevented without the addition of particularly large-scale parts, this new product can greatly contribute to the high-speed running of the clip, the reduction of driving force, and the realization of roughly stable film gripping. A lip device is provided.

Additionally, the device of the present invention fully serves as a safety device to prevent damage to rails, clips, etc.

The sheet-like material clipping device of the present invention can typically be optimally used in a simultaneous biaxial stretching device in a film manufacturing process.

[Brief explanation of the drawing]

FIGS. 1A and 1B are schematic diagrams illustrating an embodiment of the sheet-like object clipping device of the present invention and its operation. FIGS. 2 and 3 are schematic diagrams showing other embodiments of the sheet-like object clipping device of the present invention. FIG. 4, FIG. 5, and FIG. 6 are schematic diagrams illustrating the structure, operation, etc. of a conventionally known two-stage clip device. Brief description of the drawings 1: Clip device main body 2 Nilever member 3: Upper gripping body 4: Lower gripping body 5 Nilever shaft 6: Bin 7: Locking part 8: Roller 9 Niguide 10: Traveling body ゛11: Film 12: Spring 13: Tension spring 14: Lower support portion in the main body 15: Upper support portion in the main body 16: Portion on the side opposite to the grip surface of the upper grip body surface 17. 18: Stopper Patent applicant Higashishi Co., Ltd. Figure No. A Figure 1 8 Figure 1 C Figure 2 R Figure 3 Figure 4 Figure 5

Claims (4)

[Claims] (1) A lever member rotatable around a point O_1 on the clip device body, an upper grip body rotatable around a point O_2 on the lever member, and a lower grip body provided on the main body. In the sheet-like object clipping device, the sheet-like object should be gripped by the upper gripping body and the lower gripping body coming into surface contact with the sheet-like object and gripping the sheet-like object under pressure by rotating the lever member. In the process of rotating the lever member in the downward direction, when the straight line connecting O_1 and O_2 passes through O_1 and the straight line perpendicular to the lower grip body surface, further rotation of the lever member is prevented. A sheet-like material clipping device characterized by being provided with a stopper that can be controlled. (2) Claim (1) characterized in that a stopper portion is provided on the lever member, and the stopper is configured such that the upper grip body and the lower end portion of the lever member interfere with each other. The sheet-like material clipping device described above. (3) Claim (1) characterized in that the stopper portion is provided on the clip device main body or the lever member, and the stopper is configured such that the lever member and the clip device main body interfere with each other. The sheet-like material clipping device described above. (4) Claims (1), (2), or (3), wherein the sheet-like material is a film.
The sheet-shaped material clipping device described in 2.