CN109968641B

CN109968641B - Transverse stretcher with longitudinal contraction function of sheet-like object

Info

Publication number: CN109968641B
Application number: CN201811375622.7A
Authority: CN
Inventors: 山下祥平; 中岛一郎
Original assignee: Japan Steel Works Ltd
Current assignee: Japan Steel Works Ltd
Priority date: 2017-11-20
Filing date: 2018-11-19
Publication date: 2021-03-30
Anticipated expiration: 2038-11-19
Also published as: TWI732157B; JP6969050B2; KR102192362B1; KR20190058322A; CN109968641A; JP2019093571A; TW201922453A

Abstract

Provided is a transverse stretching machine having a longitudinal contraction function of a sheet, which can stretch the sheet in one direction and contract the sheet in the other direction or further stretch the sheet in one direction and contract the sheet with a simple structure. Comprising: an inlet area in which outer and inner peripheral side rails facing each other on both sides of the sheet are arranged in parallel and the interval between the rails is arranged at a first distance; a transverse stretching and longitudinal shrinking area which is connected with the inlet area and is used for expanding the outer circumference side guide rail and the inner circumference side guide rail towards the conveying direction of the sheet-shaped objects; in the exit side region, which is connected to the transverse stretching and longitudinal shrinking region, and in which the outer peripheral side rails and the inner peripheral side rails facing each other on both sides of the sheet are arranged in parallel and the intervals of the rails are arranged at a second distance wider than the first distance interval, the first distance interval of the rails arranged in the entry side region is set so that the ring plates of the equal-length ring device are arranged in a straight line and positioned on the inner peripheral side rails.

Description

Transverse stretcher with longitudinal contraction function of sheet-like object

Technical Field

The present invention relates to a stretching machine for stretching a sheet-like object such as a thermoplastic resin film, and more particularly to a transverse stretching machine having a longitudinal contraction function of the sheet-like object.

Background

Conventionally, as a stretcher for stretching a sheet, the following structure has been proposed and put into practical use: the present invention has been made in view of the above problems, and an object of the present invention is to provide an endless loop device which is formed by connecting a plurality of equal length loop devices, which are provided with gripping devices for gripping side end portions of a sheet, are formed in a zigzag shape, and are guided by an outer peripheral side guide rail and an inner peripheral side guide rail arranged along a closed path formed in a substantially horizontal plane and returning from an inlet side into which the sheet is introduced to the inlet side via an outlet side from which the sheet is discharged, on both sides of the sheet, and move the plurality of equal length loop devices along the closed path, thereby conveying the sheet from the inlet side toward the outlet side, and simultaneously stretch the sheet in a longitudinal direction (MD direction) along a conveying direction of the sheet and a transverse direction (TD direction) perpendicular thereto along a width direction of the sheet, and then discharge the sheet from the outlet side (for example, refer to patent documents 1 to 3).

[ Prior Art document ]

[ patent document ]

[ patent document 1 ] Japanese examined patent publication No. 5-4896

[ patent document 2 ] Japanese patent No. 4379306

[ patent document 3 ] Japanese patent No. 4802919

[ problem to be solved by the invention ]

On the other hand, in recent years, along with diversification of the material and function of the sheet-like object, there has been a demand for stretching in one direction and shrinking in the other direction, or further shrinking after stretching in one direction.

Disclosure of Invention

The invention aims to provide a transverse drawing machine which has a simple structure, can draw a sheet in one direction and contract the sheet in the other direction, or further can draw the sheet in one direction and contract the sheet after drawing the sheet in one direction, and has a longitudinal contraction function of the sheet.

[ MEANS FOR solving PROBLEMS ] A method for solving the problems

In order to achieve the above object, a lateral stretching mechanism having a function of contracting a sheet in a longitudinal direction of the sheet according to the present invention includes an endless loop device formed by connecting a plurality of equal length loop devices in a jointless manner, the equal length loop devices having gripping devices for gripping side end portions of the sheet and being formed in a folded length shape, outer peripheral side rails and inner peripheral side rails being arranged on both sides of the sheet along closed paths formed on a substantially horizontal plane and returning from an inlet side into which the sheet is introduced to the inlet side via an outlet side from which the sheet is sent out, the plurality of equal length loop devices being moved along the closed paths by being guided by the outer peripheral side rails and the inner peripheral side rails, thereby conveying the sheet from the inlet side toward the outlet side, and stretching the sheet in a transverse direction perpendicular to a sheet conveying direction along a width direction of the sheet In the above-described transverse drawing machine, the sheet-like material is contracted in a longitudinal direction along a conveying direction, and then the sheet-like material is fed out from the outlet side,

comprising: an inlet area in which an outer peripheral side rail and an inner peripheral side rail facing each other on both sides of the sheet are arranged in parallel and an interval between the outer peripheral side rail and the inner peripheral side rail is arranged at a first distance interval; a transverse stretching and longitudinal shrinking area which is connected with the inlet area and is used for arranging the outer circumference side guide rail and the inner circumference side guide rail in an expanding shape towards the conveying direction of the sheet-shaped objects; and an exit area connected to the transverse stretching and longitudinal shrinking area, wherein the outer periphery side guide rail and the inner periphery side guide rail which are opposite to each other on both sides of the sheet are arranged in parallel, and the interval between the outer periphery side guide rail and the inner periphery side guide rail is arranged at a second distance interval which is wider than the first distance interval,

the first distance interval between the outer peripheral side rail and the inner peripheral side rail disposed in the entrance area is set so that the ring plates of the equal-length ring devices are arranged in a straight line and positioned on the inner peripheral side rail.

In this case, a transversely contracted area may be provided between the transversely stretched and longitudinally contracted area and the exit side area, the transversely contracted area being configured such that the outer circumferential side rail and the inner circumferential side rail are arranged to be narrower toward the sheet conveying direction.

[ Effect of the invention ]

The present invention provides a cross stretcher having a longitudinal contraction function of a sheet, comprising: an inlet area in which an outer peripheral side rail and an inner peripheral side rail facing each other on both sides of the sheet are arranged in parallel and an interval between the outer peripheral side rail and the inner peripheral side rail is arranged at a first distance interval; a transverse stretching and longitudinal shrinking area which is connected with the inlet area and is used for arranging the outer circumference side guide rail and the inner circumference side guide rail in an expanding shape towards the conveying direction of the sheet-shaped objects; and an exit area connected to the transverse stretching and longitudinal shrinking area, wherein the outer peripheral side guide rail and the inner peripheral side guide rail are arranged in parallel on both sides of the sheet, and the interval between the outer peripheral side guide rail and the inner peripheral side guide rail is arranged at a second distance interval wider than the first distance interval, so that the sheet can be stretched in the transverse direction and shrunk in the longitudinal direction with a simple structure, while the basic structure of a conventional stretcher for stretching the sheet can be adopted, or the longitudinally stretched sheet can be shrunk by using the stretched sheet as a raw material for rolling the sheet.

Further, by setting the first distance interval between the outer peripheral side rail and the inner peripheral side rail arranged in the entrance area so that the ring plates of the equal-length ring devices are aligned in a straight line and positioned on the inner peripheral side rail, the longitudinal contraction length and contraction rate of the sheet can be set large, and the transmission of the driving force between the equal-length ring devices and the guiding of the outer peripheral side rail and the inner peripheral side rail can be smoothly performed.

Further, by providing a transverse contraction region in which the outer peripheral side rail and the inner peripheral side rail are arranged so as to become narrower in the sheet conveying direction between the transverse stretching and longitudinal contraction region and the exit side region, the sheet can be stretched and contracted in the transverse direction.

Drawings

Fig. 1 is a plan view showing an embodiment of a transverse stretcher having a longitudinal contraction function of a sheet material according to the present invention.

Fig. 2 is an explanatory view schematically showing a main part of the guide rail and the equal length ring device of the stretching machine.

Fig. 3 is a plan view showing a state where the ring plates of the equal length ring device of the drawing machine are opened.

Fig. 4 is a plan view showing a state where the ring plates of the equal length ring device of the drawing machine are closed.

Fig. 5 shows the equal length ring arrangement of the stretcher, (a) is a cross-sectional view X-X of fig. 3, (b) is a bottom view of (a), and (c) is a right side view of (a).

Figure 6 is a cross-sectional Y-Y view of the equal length ring arrangement of the stretcher of figure 3.

Fig. 7 is a Z-Z cross-sectional view of the isometric ring apparatus of the stretcher of fig. 3.

[ Mark Specification ]

1 sheet-like article

Equal-length ring device

3 jointless ring device

4 entrance side sprocket

5 peripheral side guide rail

6 inner peripheral side guide rail

7 outlet side sprocket

8-ring shaft

9 Ring shaft

10 ring axle support

11 ring axle support

12. 12 a-12 d two pairs of transverse rollers

12a, 12c diagonal to each other

12b, 12d diagonal to each other

13 horizontal roller

14a, 14b support roller

15. 16 ring plate

17 mounting part of gripping device

18 gripping device

19 roll for preventing floating

20 upward floating prevention track

A inlet side zone (preheating zone)

B transverse stretching and longitudinal shrinking zone

B' transverse contraction zone

C Outlet side area (Heat fixation area)

Detailed Description

Next, an embodiment of a transverse stretcher having a longitudinal contraction function of a sheet according to the present invention will be described with reference to the drawings.

The transverse stretching machine with the longitudinal contraction function of the sheet-like object is provided with: a conveying space extending in a front-rear direction (a left-right direction in fig. 1) at a central portion thereof for conveying a sheet 1 made of a thermoplastic resin or the like as a processing object; and a pair of endless ring devices 3 disposed on both sides of the conveyance space.

In this drawing machine, an inlet side area (preheating area) a, a transverse drawing and longitudinal shrinkage area B, and an outlet side area (heat-fixing area) C are set in series in the conveying direction of the sheet 1.

The endless loop device 3 is formed by connecting a plurality of equal length loop devices 2 without joints in the same manner as in patent documents 1 to 3, and the equal length loop devices 2 are formed in a folded-rule shape including a grip device 18 for gripping the side end portion of the sheet-like object 1.

The plurality of equilong ring devices 2 connected without joints are engaged with the inlet-side sprocket 4 and the outlet-side sprocket 7 which are required and arranged at predetermined positions on the inlet side and the outlet side of the sheet 1 in the conveying space.

Further, the endless loop devices 3 are constituted by a plurality of the equal length loop devices 2 being connected without joints, and are placed on the outer peripheral side rail 5 and the inner peripheral side rail 6 via the

support rollers

14a and 14b, and the outer peripheral side rail 5 and the inner peripheral side rail 6 are arranged along a closed path formed on a substantially horizontal plane that returns from the inlet side of the introduction sheet 1 to the inlet side via the outlet side of the delivery sheet 1, and the plurality of the equal length loop devices 2 move along the closed path.

Hereinafter, when the outer peripheral side rail 5 and the inner peripheral side rail 6 need not be described in particular distinction, both are collectively referred to as "

rails

5 and 6".

The endless loop arrangement 3 is driven by an inlet-side sprocket 4. The sheet 1 is gripped by opening and closing the gripping device 18 by an opening and closing means (not shown) such as an opening and closing guide provided on the inlet side, and heated to a temperature necessary for lateral stretching and longitudinal contraction in a preheating region (inlet-side region) a. Further, in the transverse stretching and longitudinal contraction region B, the endless ring device 3 is guided by the

guide rails

5 and 6 arranged to be expanded in the traveling direction and the grasping pitch is gradually reduced from P1 to P2, whereby the sheet 1 is stretched in the transverse direction (TD direction) along the width direction of the sheet 1 perpendicular to the conveying direction of the sheet 1 and contracted in the longitudinal direction (MD direction) along the conveying direction, then, the sheet is thermally fixed at a predetermined temperature in the thermal fixing region (exit side region) C, a cooling region (not shown) is provided as necessary to cool the sheet, the grasping device 18 is opened and closed by an opening and closing means (not shown) such as an opening and closing guide provided on the exit side to detach the sheet 1, and the detached sheet 1 travels as it is. The endless ring device 3 is driven by the outlet-side sprocket 7 and returns to the inlet-side sprocket 4.

As shown in fig. 2a, a transversely contracted area B' in which the outer peripheral side rail 5 and the inner peripheral side rail 6 are arranged to be slightly narrower (narrowed) in the conveying direction of the sheet 1 may be provided between the transversely stretched and longitudinally contracted area B and the outlet side area C. Thereby, the sheet 1 can be slightly contracted after being stretched in the transverse direction.

In this way, the transverse stretching machine having the longitudinal contraction function of the sheet is provided with the endless loop device 3 having the plurality of gripping devices 18 for gripping the end portions of the sheet 1 at both side ends of the sheet 1, and the endless loop device 3 is composed of the plurality of equally long loop devices 2 formed in a folded shape, is driven by the inlet-side sprocket 4 of the sheet 1, is guided by the

guide rails

5, 6 arranged in a spread shape in the traveling direction, and contracts in the longitudinal direction (MD direction) in the conveying direction while stretching the sheet 1 in the transverse direction (TD direction) along the width direction of the sheet 1 perpendicular to the conveying direction of the sheet 1, then detaches the sheet 1, is driven by the outlet-side sprocket 7, and returns to the inlet-side sprocket 4.

Here, the gripping device 18 may be configured to have a small gripping force, specifically, a structure having a small gripping force in the MD direction, and thus the device can be simplified.

The

rails

5 and 6 are a pair of outer peripheral side rails 5 having a rectangular cross section and extending in parallel with inner peripheral side rails 6 on the opposite side of the sheet.

A ring shaft holder 10 (first ring shaft holder) is disposed so as to straddle above the outer peripheral side guide rail 5, and two pairs of horizontal rollers (radial bearings) 12(12a to 12d) are rotatably mounted below both sides thereof about the vertical axis.

A ring shaft holder 11 (second ring shaft holder) is disposed so as to straddle above the inner peripheral side rail 6, and a pair of horizontal rollers (radial bearings) 13 are rotatably attached to the lower portions of both sides thereof about the vertical axis.

The

horizontal rollers

12 and 13 are arranged to roll on both side surfaces of the

guide rails

5 and 6 that regulate the operation of the equal length ring device 2, and by changing (rotating) while always making contact with both side surfaces of the

guide rails

5 and 6 substantially perpendicularly by the operation (rotation) thereof, the ring shafts 8 and 9 (described later) are moved at high speed, and the equal length ring device 2 can be moved at high speed while being guided by the

guide rails

5 and 6.

A mounting portion 17 protruding toward the sheet-like object side (protruding substantially vertically) is formed in the ring shaft holder 10, and a grip device 18 is provided in the mounting portion 17. The grip device 18 is disposed close to the guide rail 5 so that the protruding distance from the guide rail 5 decreases, and is provided so that the movement of the grip position is reduced even if the pivot bracket 10 swings.

A ring shaft 8 is rotatably connected to ring

plates

15 and 16 constituting a bending portion of an equal length ring device, and is attached to the opposite surface of the ring shaft holder 10. The loop shaft 8 of the loop shaft bracket 10 is provided at a position deviated from the center of the guide rail 5 toward the guide rail 6 in order to dispose the grip device 18 close to the guide rail 5.

The ring shaft 9 is provided at the lower end of the ring shaft holder 11 so as to be positioned substantially directly above the center of the guide rail 6. The ring shaft 9 is a ring shaft for rotatably connecting the

ring plates

15 and 16 together with the ring shaft 8.

The ring shaft holder 10 has a pair of

lateral rollers

12a and 12d that sandwich one side of the guide rail 5 and a pair of

lateral rollers

12b and 12c that sandwich the other side of the guide rail 5. A plurality of the above-structured ring shaft brackets 10 are arranged in parallel along the guide rail 5. On the other hand, the ring shaft holder 11 has a pair of horizontal rollers 13 sandwiching the guide rail 6, and a plurality of them are arranged in parallel along the guide rail 6.

The ring shaft holder 10 is in two-point contact (two-point contact) with both side surfaces of the guide rail 5 by two pairs of horizontal rollers 12a to 12d (4 pieces), and therefore its posture is restricted by the guide rail 5. Therefore, the posture of the gripper 18 attached to the loop shaft holder 10 is also restricted, and the posture protruding toward the sheet 1 side in the direction substantially perpendicular to the guide rail 5 (vertical direction) is always maintained in any one of the state in which the

loop plates

15 and 16 shown in fig. 3 are opened (the state in which the

loop plates

15 and 16 are aligned in a straight line and positioned on the inner peripheral side guide rail 6) and the state in which the

loop plates

15 and 16 shown in fig. 4 are closed.

On the other hand, since the ring shaft holder 11 is in contact with both side surfaces of the guide rail 6 one by one (in one-point contact) by the pair of

horizontal rollers

13 and 13, the posture is not strongly restricted by the guide rail 6 as compared with the ring shaft holder 10, and the ring shaft holder can rotate around the ring shaft 9 within the range of the mechanical play, so that smooth operation can be performed when moving along the guide rail 6.

In the present embodiment, the ring shaft holder 10 is provided with the horizontal rollers 12a to 12d vertically shifted, with the

horizontal rollers

12b and 12d located diagonally above the guide rail 5 and the

horizontal rollers

12a and 12c located diagonally below. Due to this vertical relationship, the distance from the positions of the

horizontal rollers

12b and 12d supporting the reaction force to the gripping device 18 is shortened, whereby the deflection therebetween can be reduced. Therefore, by reducing the deflection, the change in the position where the sheet 1 is gripped by the gripping device 18 can be suppressed, and the sheet can be stretched with high accuracy. Here, the lateral roll on the sheet side, i.e., on the inlet side is 12b, and the diagonal lateral roll is 12 d.

The

horizontal rollers

12b and 12d are disposed on the ring shaft holder 10 so as to sandwich the upper portion of the guide rail 5, and the

horizontal rollers

12a and 12c are disposed on the tip end of a support shaft 12e protruding from the lower end of the ring shaft holder 10 so as to sandwich the lower portion of the guide rail 5.

Since the ring shaft holder 10 is configured by arranging two pairs of the horizontal rollers 12a to 12d in the horizontal direction, a larger installation space is required in the direction along the guide rail 5 than in the pair of horizontal rollers.

In the present embodiment, the horizontal rollers adjacent to the ring shaft holder 10 are arranged to overlap while being shifted vertically, thereby suppressing the installation space along the guide rail 5.

That is, since the support shaft 12e protrudes by the thickness of the horizontal roller 12b and the horizontal roller 12d or more, the horizontal roller 12a and the horizontal roller 12b and the horizontal roller 12c and the horizontal roller 12d can be arranged to overlap each other in the lateral direction without contact. Therefore, the installation space of the

lateral rollers

12a and 12b along the guide rail 5 is suppressed by the overlap amount.

When a plurality of the above-structured ring shaft holders 10 are arranged in parallel along the guide rail 5, the

horizontal rollers

12a and 12b and the

horizontal rollers

12c and 12d of the adjacent ring shaft holders 10 are adjacent to each other. In the present embodiment, since the horizontal rollers of the adjacent ring shaft brackets 10 are vertically separated from each other without contact, the ring shaft brackets 10 can be arranged to overlap in the lateral direction, and the pitch between the adjacent ring shaft brackets 10 can be reduced by the overlap amount.

The ring shaft holder 11 is configured such that a pair of horizontal rollers 13 are symmetrically arranged across the guide rail 6, and move in a stable state while sandwiching the same position (position at the same height) of the guide rail 6 from both sides.

Further, by reducing the installation space and the pitch of the horizontal rollers of the ring shaft holder 10, the same pitch is obtained when a plurality of

ring shaft holders

10 and 11 are arranged in parallel on the guide rail.

The ring shaft 9 of the ring shaft holder 11 is disposed so as to be positioned substantially directly above the center of the inner peripheral side rail 6. With this configuration, the size of the ring (ring plates 15 and 16) can be increased. Therefore, the shrinkage length and shrinkage rate in the MD direction (the direction of film travel) can be increased. In other words, the distance between the

guide rails

5 and 6 can be reduced to achieve the same contraction length and contraction rate, and therefore the device can be downsized.

Further, in the present embodiment, the distance interval (first distance interval) between the outer peripheral side rail 5 and the inner peripheral side rail 6 disposed in the entrance side area a is set so that the

ring plates

15 and 16 of the equal length ring devices 2 are aligned in a straight line and positioned on the inner peripheral side rail 6, so that the longitudinal contraction length and the contraction rate of the sheet 1 can be set large, and the transmission of the driving force between the equal length ring devices 2 and the guiding of the outer peripheral side rail 5 and the inner peripheral side rail 6 can be smoothly performed.

In the present embodiment, in order to prevent the equal length hoop device 2 from floating during movement, the floating prevention rollers 19 are disposed on the mounting portion 17 of the grasping device and supported by the floating prevention rail 20 laid on the fixed side.

In the above configuration, the movement operation of the equal length ring device 2 guided by the

guide rails

5, 6 is described.

In the entrance-side area a, in a state where the

ring plates

15, 16 of the equal length ring device 2 are opened to be aligned in line and positioned on the inner peripheral side guide rail 6, the end portions of the sheet 1 are gripped at intervals of a pitch P1 by the respective gripping devices 18 projecting in the substantially vertical direction from the guide rail 5. When the equal length ring device 2 is driven by the entrance side sprocket 4, the horizontal rollers of the respective ring shaft holders move while being rotated while being in contact with the

guide rails

5 and 6, respectively.

When the transverse rollers 12(12a to 12d) and the transverse rollers 13 of the equal length ring device 2 reach the transverse stretching and longitudinal shrinking region B in which the

guide rails

5 and 6 are arranged in the spread state, the interval between the outer peripheral side guide rail 5 and the inner peripheral side guide rail 6 gradually increases, and the angle θ of the

ring plates

15 and 16 of the equal length ring device 2 gradually closes from the open state (180 °) in which they are aligned in a straight line. The intervals between the adjacent

hoop axis brackets

10 and 11 are narrowed, and the interval between the grasping means 18 is also narrowed from the grasping pitch P1 to P2. The areas where the intervals between the

ring shaft brackets

10, 11 are narrowed are a transverse stretching and longitudinal contracting area B and thereafter an exit side area (heat fixing area) C where the distance interval (second distance interval) between the outer circumference side guide rail 5 and the inner circumference side guide rail 6 is maintained at a constant distance greater than the distance interval (first distance interval) between the outer circumference side guide rail 5 and the inner circumference side guide rail 6 disposed in the entrance side area a.

Thus, the ring shaft holder 10 is guided by the guide rail 5 in a posture restricted, and the gripping device 18 stretches the sheet 1 in a transverse direction (TD direction) perpendicular to the conveying direction of the sheet 1 and along the width direction of the sheet 1 in a posture protruding in the vertical direction from the guide rail 5, and at the same time, contracts and stretches in a longitudinal direction (MD direction) along the conveying direction.

In this way, the transverse stretching machine having the longitudinal contraction function of the sheet can stretch the sheet in the transverse direction and contract the sheet in the longitudinal direction with a simple structure, while following the basic structure of the conventional stretching machine for stretching the sheet, or further can contract the sheet stretched in the longitudinal direction by using the stretched sheet as a material for a roll of the sheet.

Further, by setting the first distance interval between the outer peripheral side rail 5 and the inner peripheral side rail 6 disposed in the entrance side area a so that the

ring plates

15 and 16 of the equal length ring devices 2 are aligned in a straight line and positioned on the inner peripheral side rail 6, the longitudinal contraction length and contraction rate of the sheet 1 can be set large, and the transmission of the driving force between the equal length ring devices 2 and the guide of the outer peripheral side rail 5 and the inner peripheral side rail 6 can be smoothly performed.

Further, as shown in fig. 2(a), by providing a transverse contraction region B' between the transverse stretching and longitudinal contraction region B and the exit side region C, in which the outer periphery side rail 5 and the inner periphery side rail 6 are arranged to be slightly narrower (reduced) in the conveying direction of the sheet 1, the sheet 1 can be stretched in the transverse direction and then slightly contracted.

The above description has been made of the embodiment of the transverse stretching machine having the longitudinal contraction function of the sheet-like object according to the present invention, but the present invention is not limited to the configuration described in the above embodiment, and the configuration may be appropriately modified within the scope not departing from the gist thereof.

[ INDUSTRIAL APPLICABILITY ]

The transverse stretching machine having the longitudinal contraction function of the sheet according to the present invention can stretch the sheet in one direction and contract the sheet in the other direction with a simple structure, or further can contract the sheet after stretching in one direction, and therefore can be suitably used for the purpose of stretching and contracting the sheet in accordance with the diversification of the material and function of the sheet, and has a great industrial applicability.

Claims

1. A transverse stretching machine having a function of contracting a sheet in a longitudinal direction is configured to include an endless loop device formed by connecting a plurality of equal-length loop devices in a jointless manner, the equal-length loop devices having a gripping device for gripping a side end portion of the sheet and being formed in a folded-length shape, an outer peripheral side guide rail and an inner peripheral side guide rail being arranged along a closed path formed on a substantially horizontal plane from an inlet side where the sheet is introduced to the sheet through an outlet side where the sheet is sent out and returned to the inlet side, the plurality of equal-length loop devices being moved along the closed path by being guided by the outer peripheral side guide rail and the inner peripheral side guide rail, thereby conveying the sheet from the inlet side toward the outlet side and stretching the sheet in a transverse direction perpendicular to a conveying direction of the sheet along a width direction of the sheet, contracting the sheet in a longitudinal direction along a conveying direction, and then sending out the sheet from the outlet side,

the transverse stretching machine with the longitudinal contraction function of the sheet-like object is characterized in that,

2. The transverse stretching machine with the longitudinal contraction function of the sheet according to claim 1,

between the lateral stretching and longitudinal contracting region and the exit side region, there is a lateral contracting region in which the outer peripheral side rail and the inner peripheral side rail are arranged so as to become narrower toward the sheet conveying direction.