JPS5949939A - Link device for stretching sheetlike material and stretching device using it - Google Patents

Abstract

PURPOSE:To provide the titled stretching device capable of making stable traveling and stable stretching at high speed by such an arrangement wherein a specific chain- link mechanism is equipped with a sub-link capable of constantly maintaining its position perpendicular to the direction of traveling. CONSTITUTION:A special pantograph is composed by short links 11, 12a, 12b and long links 13a, 13b, 14a, 14b, and No.1 sub link 40 is connected to pins A, B and the link 40 is constantly maintained in the direction perpendicular to the direction of traveling of the special pantograph. Intermediate links 15a, 15b, 16a, 16b, of which length is a 1/2 that of the long link, are connected to the center of long links by pins E, F and a link mechanism is composed by connecting adjoining intermediate links together by pin D. No.2 sub link 43 is connected to pins C, D and the link 43 is constantly maintained in the direction perpendicular to the direction of traveling of the special pantograph. The sub links 40, 43 are equipped with clamping units 41 which hold the end of a film respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the physical and mechanical properties of a sheet-like material, such as a thermoplastic synthetic resin film, in the longitudinal direction (longitudinal direction) and and/or a link device for stretching in the lateral direction and a stretching device using the link device.

Conventionally, simultaneous two-wheel stretching devices using links include a system applying a pantograph link proposed in Japanese Patent Publication No. 43'-5560, and a folding scale link proposed in Japanese Patent Publication No. 44-7155. A typical example is the application of

However, with these conventional methods, abnormal force interference occurs between the drive sprocket and the guide rail that guides the special link, so the guide rail has to be cut once at the drive sprocket position. Therefore, it is necessary to transfer the special link to the guide rail before and after the drive sprocket 1, and this transfer causes a problem in that the speed increase is suppressed. In addition, in the normal running section,
The orientation of the gripper of the sheet-like object changes depending on the opening degree of the special link, and the stretching tension of the sheet-like object, the force of running the traveling body, and the force due to the special link's own weight are not balanced. However, there was a problem in that it lacked high-speed stability in stretching and running.

In order to compensate for the above-mentioned drawbacks, the present applicant previously proposed in Japanese Patent Application No. 134349/1982 a sub-link that always maintains a positional relationship perpendicular to the running direction, and the direction of the gripping body for the sheet-like object is adjusted. A pantograph link mechanism has been proposed that does not change depending on the opening of the special link and takes into account the mechanical balance, and it has become possible to achieve higher speeds than conventional ones. However, as the vehicle travels at higher speeds, the force applied to the guide rails that determine the degree of bending and stretching of the pantograph links and to each link increases.

Therefore, in order to achieve stable running at high speeds, a guide rail with a larger shape that does not deform even at high speeds is required, and each link also needs to be larger accordingly. As a result, the gripping depth of the initial sheet 1-like object inevitably becomes large, and as the stretching progresses, a constricted portion occurs in the lateral direction in the portion not supported by the gripping device, and as a result, the sheet-like object There were disadvantages in that the thickness of the product was uneven and the yield of the product was reduced.

The present invention aims to improve the conventional special link running type that has these drawbacks, and proposes a new link opening 1n.The purpose of this invention is to easily achieve higher speeds, and to achieve stable running and extension even at high speeds. The object of the present invention is to provide a stretching device that can perform the following.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 7 is an overall schematic plan view of a stretching device according to an embodiment of the present invention. In the figure, a film (or sheet) 1 to be stretched is carried in in the direction of the arrow, held by a gripper 41 that grips the end of the film, and stretched in the vertical and horizontal directions while being moved. The gripping body 41 is placed over the special pantograph link 10 and the intermediate link 16,
The first and second sub-links 40 and 43 are installed in a direction perpendicular to the traveling direction of the vehicle. Below, the sub link 40 provided in the special pantograph link 1o. The sub-link provided in the intermediate links 15 and 16 is tentatively referred to as a second sub-link 43. The special pantograph link 1o is equipped with a pair of inductors 21 and 22, and the running path of the inductors 21 and 22 is determined by a pair of endless guide rails 23 and 24. Further, the special pantograph link 10 is driven by a drive sprocket 5o arranged on the exit side.

Although not shown in this figure, a pre-tensioning mechanism is incorporated in this chain running system as well as general chain running devices, and this mechanism allows the water special pantograph link 10 to
The M conductors 21 and 22 run without being lifted off the endless rails 23 and 24. The endless rails 23, 24 are arranged so that the pantograph link 1o and the intermediate links 15, 16 are contracted in the running direction on the entrance side, and are expanded on the exit side, as shown in the figure. The left and right sides are spread out in pairs.

2, 3, and 4 are enlarged views of the special pantograph link part of FIG. 1 in order to make the details of the present invention clearer. The figure is a plan view, and FIG. 4 is a longitudinal sectional view.

In FIGS. 2, 3 and 4, the special pantograph link 1o has two types of links, long and short, namely short links 11.12a, 12b and long links 13a, 13b.
14a and 14b, and the respective links are connected by bins Δ, B, and C.Inductors 21a and 21b are installed above and below the bins, and inductors 22a and 22b are installed above and below the bin C. There are two types of inductors: sliding type and rotating type.
In this figure, a rotating type consisting of a rotating body supported via a bearing is shown in consideration of high-speed stability.

11 children 21a, 21+), 22a, 22b Lt
It is guided by d-end rails 23a, 23b, 24a, and 24b.

The endless rails 23a, 23b are attached to the rail 100, and the endless rails 24a, 24b are attached to the rail 200, which is slidably supported in the horizontal direction by the rail 100, as shown in FIG. 4, and the relative positions of the rails 100 and 200 are fixed. It has an adjustment mechanism (not shown) outside the system that can change the value, and also has an adjustment mechanism (not shown) that can be arranged in a shape that expands toward the end.

Furthermore, a first sub-link 4o is connected to the bins A and B, and the connection method of the first sub-link 4o is fixed for bin A and slidable for bin B. Long holes 40a, 40 provided in the sub link 40
By slidably positioning the bin B at the point b, the first sub link 40 can always maintain a direction perpendicular to the running direction of the special pantograph link 10. On the first auxiliary link 4o, there is a gripping body 41 that grips the end of the film, and guides 42a, 42b that bear various vertical loads during traveling, including the own weight of the special pantograph link 10, the first auxiliary link 40, etc. 42c, 42tl 1l
Both are equipped with an IR and move on rails 100 and 200. Also, the system children 42a, 42h,
42c, 4251 are inductors 21a, 21h, 22a,
Similar to 22b, both sliding type and rotating type can be installed, but in this figure, a rotating type consisting of a rotating body supported via a bearing is representative in order to achieve high-speed stability. Illustrated.

At the midpoint of 13a, 13b, 14a, 14b, there is a long link 1 that can be rotated by the bins E and F.
Intermediate links 15a, 15b and 16a, 16b each having a length of 1/2 of those of 3a, 13b, i4a, and 14b are connected. Intermediate phosphorus'y15a, 15b O, J:
'CFI 6a, 16b 1. t, the adjacent pantograph link 1o is similarly provided. J
) 16a, 16b #, J:hi15a 1
151) and the long link 13cl, 131+ of the pantograph link 10, which is connected via the bin D.

14a, 14b and intermediate link 15. a, 15b.

16a and 116b constitute a pantograph-like link structure. Further, a second sub-link 43 is connected to the bins C and D, and the second sub-link 43 is connected in a fixed manner for the bin D, and in a slidable manner for the bin C. By slidably positioning the bottle C in the elongated hole 438.43+1 provided in the sub link 43, the second sub link 43 can be moved in the traveling direction of the special pantograph link 10, as in the case of the first sub link 40. It has a mechanism that allows it to always maintain a perpendicular direction. A gripper 41 is attached to the second sub-link 43 and the first sub-link 40 to grip the film end. In this way, the special pantograph link 10 and the intermediate link 15
By continuously connecting the link mechanisms configured by connecting a, 15t+, 16a, and 16b@, an annular endless genin link is constructed.

As can be seen from the above description, compared to the previous proposal by the applicant in which a sublink is added to a vantagraph link consisting of two types of long and short links, the structural features that characterize the present invention are as follows. , the intermediate link and the second sub-link are numbered, and in this embodiment, the second sub-link is connected to the intermediate link.

Next, in order to further clarify the technical points of the present invention, we will explain the functions and functions of each part. I will clarify.

First of all, the stretching device 2 increases the degree of bending and stretching of the special pantograph link 1o by z'' as it travels at high speed.

24b and the forces generated on each link increase.

Therefore, in order to achieve more stable running at high speeds (9), it is necessary to use high-impedance rules 23 that do not deform even at high speeds, that is, have high rigidity and strength.
a, -23b, 2ja, 24b.

It is necessary to adopt a link member. However, guidance rail 2
In order to increase the rigidity of the inductors 21a, 22a and 21b, 22
It is necessary to take a large interval b, and each link member inevitably becomes long. Generally, when stretching an unstretched film, a lateral constriction occurs in the ungridded portions on both sides of the film, so it is desirable to reduce the initial edge bit of the film as much as possible in terms of film quality. - When the grip bit is made smaller, the guide rails 23a, 23b, 24a, 24b long link 13a
, 13b, 14a, and 14b increase,
As a result, the load on the link increases, leading to deformation of the guide rail, creating a vicious cycle.

Matakai'FM rail 23a, 23b, 24a 12
41) Length')>')l 3a, 13b, 14a
, 1.4b increases, the guide rail 23a
, 23b, 24a, and 24b, the degree of bending and stretching of the pantograph link 1o changes greatly, and this change has the disadvantage that the gripping pitch of the sheet-like object changes greatly.

The present invention solves the above drawbacks by connecting 31 intermediate links 15a, 15b, 16a, and 16b between the pantograph links 10 and disposing a gripping body 41 in the intermediate link portions. If the gripping pitch can be reduced to 1/2, the load generated on each link can be distributed and reduced. As a result, the necessity of increasing the strength of each component is alleviated, the weight of the component is reduced, and the force applied to each inductor 21a, 21b, 22a, 22b is also reduced, resulting in a significant reduction in running resistance.

As a second feature, guide elements 42a, 42b, 42c are provided on the first and second sub-links 40, 43, which maintain the direction perpendicular to the running direction of the special pantograph link 10, and which receive vertical loads when all the links run. , 42d, the inner child 42a , 42b , 42c , 4
2d always substantially coincides with the running direction of the special pantograph link 10, especially the guides 42a, 42b.
, 42c, and 42d are rotation devices, the point is that the rotation direction of the rotor can be made to match the running direction of the one special pantograph link 10.

Furthermore, when the sub-links 40 and 43 are equipped with the film gripping body 41, the direction of the gripping body 41 does not substantially change depending on the bending of the special pantograph link 10, so that
In particular, it is possible to obtain a length of 41 m without generating excessive twisting force at the film gripping portion, which may cause film tearing during high-speed running.

The third feature is that by arranging each member almost vertically symmetrically with respect to the film plane F-F (shown in Figure 4), the stresses generated in each part are comprehensively balanced, and the twisting This prevents the occurrence of unreasonable couples such as the following, and it becomes possible to exhibit extremely excellent performance at high speeds. Note that since the driving force is transmitted only by the special pantograph link 10, intermediate links 15a, 15b, 16a, 16
b may be any material as long as it can sufficiently withstand the stretching stress of the film.

The above description has been made using a biaxial stretching machine with good high-speed stability as an example of the present invention, and the present invention is not limited thereto in any way.

That is, as a very special example, the mechanism of the present invention is
It is also possible to adjust the distance between the pair of guide rails 23 and 24 appropriately and use it as a longitudinal stretching machine.

To further describe the gist of the present invention, the embodiments shown in Figures 141 to 4 show design examples that place particular emphasis on high-speed stability. There is no need to carry heavy equipment. That is, when the stretching stress during film stretching is small, the film surface F-
The upper guides 21a, 22a, 42a, 42c of F (FIG. 4) can be omitted, and the rails 23a, 24a for guiding them can also be omitted. If further developed, it is also possible to divide the second sub-link 43 into upper and lower parts and save the upper part.

In addition, the first sub link 40 and the special pantograph link 10
．． Second sub link 43 and intermediate links 15a, 15b,
Even if the method of attaching 16a and 16b is different, in this embodiment, the case where the diene composite tension for running the special pantograph link 10 is sufficiently larger than the film stretching tension is explained. That is, the degree of bending and stretching of the special pantograph link 10 does not change under the influence of film stretching stress, and each inductor 21a, 21b, 22a,
22b is endless rail 23a, 23b, 24a, 24
This is an explanation of a case that does not emerge from b, and if this premise breaks down, it will naturally be necessary to take some general engineering measures. To give an example, by fixedly connecting the first and second sub-links on the bins B and C sides and sliding the bins A and D sides, all the film stretching stress is transferred to the inductors 22a and 22b. Endless rails 24a, 24
b, and the special pantograph link 10 has
Since the horns are applied so as to extend the pantograph link 10 in the running direction with only the tension of the running system, jff "F
The children 21a, 21b, 22a, 22b are always in contact with the endless rails 23a123b124a, 24b, and each inductor of the pantograph link 10 runs without being lifted up.

As another modification, if it is not necessary to make the initial gripping bits so small depending on the type of sheet material to be stretched, the first sub-link is not provided as shown in FIG. 5, and the intermediate link 15a is , 15b , 16a , 161+
The guide elements 42a, 42 are provided on the letter second sub-link 43.
b, 42c, 42d and the gripping body 41 can also be provided.

In another modified example, as shown in FIG.
It is also possible to provide a holding body 41 on the second sub-link 43 to separate and cover the functions of each sub-link.

As another modified example, as shown in FIG. 7, a gripping body 41 is provided on the first sub-link 40, contrary to FIG. 6, and guide elements 42a, 42b, 42c, 42d are provided on the second sub-link 43
It is also possible to provide

As another modification, if the direction of the gripping body 41 changes due to the movement of the pantograph link 10, it does not lead to breakage of the film to be stretched or quality defects, as shown in FIG. It is also possible to provide the body 41 on an extension of the pantograph link 13a and intermediate link 15a.

As described above, when using the link device for stretching sheet 1-shaped objects of the present invention and the stretching device using the same, an intermediate link is provided in the pantograph link consisting of two types of long and short links, and the pantograph link and the intermediate link The endless chain link, which is constructed by connecting the Since the mounting pitch of the gripper for the shaped object is significantly reduced, it is possible to suppress the increase in size of the link device due to the increase in speed, and also to reduce the size of the end of the sheet 1 to the shaped object due to stretching. It is possible to suppress d sagging, and it is possible to stretch the sheet-like material at high speed and stably.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention applied to a film stretching device; FIG. 2 is a perspective view of a pantograph link in the device shown in FIG. 1; FIG. 3 is a pantograph link in the device shown in FIG. FIG. 4 is a vertical sectional view taken along IV-IV PiA of the device shown in FIG. 3; FIG. The figure is number 1! FIG. 7 is a plan view of a pantograph link according to another embodiment in which the functions of the l'l link and the second sub-link are separated; FIG. Fig. 8 is a plan view of a pantograph link according to another embodiment in which the position of the grip body is changed. 1...Film 10...Special pantograph 11.12a
, 12b...Short links 13a, 13b,
'14a, 14b--Long link 15.16, ......Intermediate link 15a,
15b, 16a, 16b--Intermediate link 21.22...Inductor 21a, 21b 122a, 22b--Inductor 23.24... ...Guidance rail 23a, 2
3b, 24a, 2/lb -・・----・-M
W polishing rail A, B, C, D, E, F... Bin 40.
......First sub-link 41...Gripper 42a, 42b, 42c, 42d--Guide 43...Second Sub-link 50... Drive sub-block]・100.2
00・・・・・・Rail Figure 8

Claims (1)

[Scope of Claims] (L) In a link HWII for sheet-shaped material stretching, which is composed of an endless chain link in which link member units i, in which Fi number of links are arranged in a pantograph shape so as to be able to bend and stretch each other, are connected in an annular manner, The length of the link members on the four sides that make up the bank graph link member unit] is 2.
f! ! And links of the same length are each +1! 'J Arranged so that they are in contact with each other, a pair of links are rotatably connected to the adjacent long links between the adjacent pantograph links, and an intermediate link is connected to connect the chain link). A link device for stretching a sheet-like material, characterized in that a sub-link is provided to maintain a positional relationship perpendicular to the traveling direction. (2) A link member unit in which a plurality of links are arranged in a pantograph shape so that they can be mutually bent and stretched. is an endless chain link connected in an annular shape, and the lengths of the link members on the four sides constituting the pantograph link member unit are long and short, and the links of the same length are arranged adjacent to each other, and the adjacent pantograph A sub-link that constitutes a link tm1M by connecting a pair of intermediate links rotatably connected to adjacent long links between the links, and that maintains a position relationship perpendicular to the running direction in the link shooting mechanism. and a guide for supporting the endless chain link in a movable manner is engaged with the sub-link, and the pantograph link member unit]
- engage an inductor in a positional relationship that determines the degree of bending and stretching of the pantograph link, and align the pair of guide rails that guide the inductor with the degree of elongation in the longitudinal or lateral direction of the sheet to be extended. Seat 1 to
1. A stretching apparatus for a shaped article, which is equipped with a pair of left and right stretching grooves in which a gripper for gripping the end of the shaped article is arranged.