JP2001159067A - Method for spreading cloths and machine for spreading cloths - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that, when a cloth is spread with a conventional cloth-spreading machine, both the chuck-gripped end corner portions are subjected to concentrated large loads and damaged to shorten the life of the cloth. SOLUTION: This method for spreading a cloth, comprising hanging both the end corner portions Sa, Sb of one side of the large area cloth S such as a bed sheet at a prescribed height in a state that both the end corner portions are gripped with a pair of chucks 21, 21 and then laterally separating both the chuck-gripped portions of the cloth to spread the cloth in the hung state, characterized by holding a place near to the central portion Sb of the upper side of the cloth with a holder and then lifting the holder, when the chuck- gripped portions of the cloth are laterally separated. Thereby, the loads at the chuck-gripped portions of the cloth are reduced to improve the durability of the cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth spreading method and a cloth spreading machine for expanding large-area cloths such as sheets.

[0002]

2. Description of the Related Art For example, in a laundry factory, the work of washing and drying cloths is pressed by a press machine or folded by a folding machine. When supplying the cloth to ()), it is necessary to spread the cloth neatly in advance.

[0003] By the way, as a cloth spreading machine for spreading a large area of cloth such as sheets, there is a conventional cloth spreading machine as shown in Figs. The conventional cloth spreading machine includes a charging device 1 that grips both corners Sa, Sa of one side of a large-sized cloth S and transfers the same to a predetermined height.
Corners S of the cloth S ₁ transported to a high position
a, left and right stretched apparatus 2 to be stretched in the lateral direction received Sa, left stretched device 2 by sucking the lower portion of the stretched been cloth S ₃ with substantially right below the right and left stretched devices have been installed in 2 stretched a suction device 3 to right and left deployed device 2 and the suction unit 3 delivery to transfer unit 4 the cloth S ₅ which is stretched in the conveying device for conveying the transfer device 4 receives the cloth S ₆ to the press machine side 6 And

[0004] In this conventional cloth spreading machine, two loading devices 1 are installed on the left and right as shown in FIG. It is to be noted that the charging device 1 may be a single device, or may be a device in which approximately four devices are arranged in the left-right direction. Each of the input devices 1 has a pair of left and right chucks 11 and 1 with an interval of about the width of a shoulder of a person.
One. Each of the chucks 11 is referred to as a charging chuck in the following description. Each of the loading-side chucks 11, 11 grips both corners Sa, Sa of one side of the cloth S, respectively. Then, each of the charging-side chucks 11
Is moved upward by a lifting / lowering device (rodless cylinder) 12 while holding the corners Sa at both ends of the cloth.

[0005] The left and right expanding device 2 is provided with each input side chuck 1.
It has a pair of left and right chucks 21 and 21 for receiving the both-ends corners Sa of the cloths grasped by 1 and 11, respectively. still,
The chuck 21 on the left and right expanding device 2 side is referred to as a receiving chuck in the following description. Each receiving side chuck 2
The left and right movements (servo motors) 22 and 22 are operated in the direction of separating and approaching each other while holding the corners Sa and Sa at both ends of the cloth. Then, the chucks 21 and 21 are denoted by reference numerals 21 'and 21' in FIG.
Position indicated by by spaced to (the upper side portion of the cloth S ₃ position to tension), so that the can cleanly is stretched a cloth such upper portion.

[0006] The suction device 3 includes a vertically oriented suction box 31.
The inside air is sucked downward by a suction machine (vacuum fan) 33. Inlet 3 of suction box 31
In the vicinity of 2, there are provided feed rollers 35, 35 which are rotated by motors 36, 36 (FIG. 2).

The transport device 6 has a front conveyor (vacuum conveyor) 61 for receiving the expanded cloth S ₅ from the left and right expanding device 2 via the transfer device 4, and a rear conveyor (discharge conveyor) 62 continuous with the front conveyor 61. are doing. The rear conveyor 62 is continuous with the press machine.

The cloth spreading machine shown in FIGS. 1 and 2 functions as follows. First, both corners Sa, Sa of one side of the large-area cloth S that has been washed and dried are searched for, and are respectively gripped by the loading-side chucks 11, 11 of the loading device 1. When the start button is pressed, the loading chucks 11 and 11 move upward while gripping the corners Sa at both ends of the cloth, and move the corners at both ends of the cloth to the receiving chucks of the left and right spreading device 2. passing to 21 (state of the S _1), then respective receiving chuck 21 is moved to the left and right outside, is stretched the upper side of the cloth S ₁ (state of the S _3). Subsequently, the high-speed rotation (clockwise) direction infeed is infeed roller 35, the switching damper 53 is switched to the chain line shown side in the suction box 31 the air is sucked, the lower end of the cloth is S ₄ the suction box 31 as S ₅ via the state
It is sucked in. In this case, this cloth S _5, are putting tension downward by the suction action of the vacuum fan 33, the fabric such is deployed in a square shape. afterwards,
Switching damper 53 is switched to the solid line shown side, the upper side portion of the cloth S ₅ which has been gripped by the receiving chuck 21 is adsorbed and held on the front end side upper surface of the suction box 41, the adsorption box 41 Retract as shown by the chain line, and the upper side of the cloth is the front conveyor (vacuum conveyor)
Is ERROR on 61 (state code S _6), cloth is fed to the press machine side through the front conveyor 61 and rear conveyer 62 remains stretched state. As described above, in the cloth spreading machine of FIGS. 1 and 2, the corners S at both ends of one side of the cloth to be spread.
a, Sa, and finds them on each input side chuck 11,
11 can be automatically expanded into a square shape only by holding it.

[0009]

When the area of the cloth is large or the cloth is thick, the weight of the cloth increases. Further, cloths such as sheets become brittle as the number of times of cleaning increases.

In the conventional cloth stretching machine shown in FIGS. 1 and 2, when the cloth is stretched, corners Sa, Sa at both ends of one side thereof are formed.
Sa is lifted while being held by the receiving-side chucks 21 and 21, and the cloth is stretched by applying tension from below by the suction device 3. However, as described above, the cloth is placed at the corners Sa, Sa at both ends.
In the case where the cloth is lifted only at two points, the total weight of the cloth and the tension by the suction device 3 are set at two points (both corners Sa, S at both ends).
a) must be supported. Therefore, when the cloths are spread, a large load is concentrated on the vicinity of both corners Sa, Sa which are gripped by the receiving-side chucks 21, 21.
There was a problem that the fabric of the gripping portion was easily damaged. In particular, in the case of fabrics in which the number of times of cleaning is increased and the fabric is brittle, when only the corners Sa at both ends are grasped, the vicinity of the corners at both ends may be broken, and the service life is shortened.

The present invention has been made in view of the above-mentioned conventional circumstances,
It is an object of the present invention to provide a cloth spreading method and a cloth spreading machine which can reduce a load on a chuck holding portion (both corners) of the cloth during a spreading operation.

[0012]

The present invention has the following structure as means for solving the above-mentioned problems. The invention according to claim 1 of the present application is directed to a method for lifting up to a predetermined high position in a state in which both side corners of one side of a large area cloth such as a sheet are gripped by a pair of chucks, and each of the cloths is The present invention is directed to a cloth spreading method in which a cloth is lifted in a suspended state by separating a chuck holding portion from side to side.

[0013] In the cloth spreading method according to the first aspect of the present invention, when separating the chuck holding portions of the cloth from side to side, the upper part of the cloth is held near the center of the upper side and the holding part is pulled up. It is characterized by performing while doing.

As described above, in the one in which the corners at both ends of one side of the cloth are stretched while being gripped by the respective chucks, the upper part of the cloth is held near the center of the upper side during the spreading operation. If you try to do it while raising it,
The load on the chuck gripping portions (both ends of the cloth) of the cloth can be reduced. The invention according to claim 2 of the present invention is directed to a method of lifting a sheet of a large area such as a sheet to a predetermined high position while holding both corners of one side of the cloth with a pair of chucks, and lifting each piece of the cloth. The present invention is directed to a cloth spreading machine in which a cloth can be stretched in a suspended state by separating a chuck holding portion from side to side. The basic configuration of the cloth spreading machine according to the second aspect can be the one of the conventional example shown in FIGS.

[0015] In the cloth stretching machine of claim 2 of the present application,
A pull-up device is provided that can hold and pull up near the center of the upper side of the cloth in a state where the corners of both ends of the cloth are gripped and lifted by the respective chucks.

Also in the second aspect of the present invention, the load on the chuck gripping portions (both corners) of the cloth during the cloth spreading operation can be reduced by the pulling device.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to FIGS. 3 to 11. FIGS. 3 to 7 show a first embodiment, and FIGS. 8 and 9 show a second embodiment. Embodiment, FIG.
11 shows a third embodiment, and FIG. 11 shows a cloth spreading machine according to a fourth embodiment. In addition, the cloth spreading machine of these embodiments is used to spread a large-area cloth S such as a sheet and transport the cloth S to a next process apparatus such as a press machine or a folding machine.

The cloth spreading machine of the first embodiment shown in FIGS. 3 to 7 has the same structure as the conventional cloth spreading machine shown in FIGS. 1 and 2 except for a pulling device 7 described later. Have been. That is, the cloth spreading machine of the first embodiment also has the same structure as the conventional cloth spreading machine, the input device 1, the left and right expanding device 2, the suction device 3, the transfer device 4, the transfer device, and the like. 6 and
And a switching damper 53. For the description of the structures, functions, and the like of these devices, the description in the section of the related art is cited.
In FIGS. 3 to 7, components denoted by the same reference numerals as those in FIGS. 1 and 2 are the same as each other.

Also in the cloth spreading machine of the first embodiment, the both-end corners Sa, Sa of one side of the large-area cloth S are searched, and the both-end corners Sa, Sa are paired with the pair of input-side chucks 1.
When the start button is pressed after each of the grippers is held by the first and second grippers 11 and 11, the respective loading-side chucks 11 and 11 are moved to the corners S at both ends of the cloth.
a, Sa is moved upward while holding it → each corner corner Sa, Sa
Passing to each recipient chucks 21, 21 of the right and left stretched device 2 (condition of S ₁ in FIG. 4) → the receiving chuck 21 as shown in FIG. 5 is moved to the left and right middle position of the deployed machine ( S ₂ states) → where it holds the upper central portion Sb of the cloth is separated each receiving chuck 21 while pulling upwards on the right and left pulling apparatus 7 as described below stretched the upper side of the cloth make (the state of S _3). Subsequently, as shown in FIG. 3, the feed roller 35 rotates at a high speed (clockwise rotation) in the feed direction, and the switching damper 53 is switched to the chain line side to suck the air in the suction box 31 to remove the cloth. the lower end of the class is sucked into the suction box 31 as S ₅ via the state of S _4. At this time, this cloth S ₅
, A downward tension is applied by the suction action of the vacuum fan 33, and the cloth is spread in a square shape. Thereafter, the switching damper 53 is switched to the solid line shown side, the upper side portion of the cloth S ₅ which has been held in the receiving side chuck 21 and pulling device 7 is adsorbed and held on the front end side upper surface of the suction box 41, retracted as adsorption box 41 the chain line shown, then the cloth upper part is ERROR on the front conveyor (vacuum conveyor) 61 (state of the sign S _6), the front conveyor 6 remains stretched state
1 and to the press machine side via the rear conveyor 62.

By the way, at the time of spreading the cloth, only the corners Sa, Sa at both ends of one side of the cloth are attached to each of the receiving side chucks 2.
In the case where the cloth is lifted in the state of being gripped at 1, 21, the total weight of the cloth and the tension by the suction device 3 must be supported at two points (both corners Sa, Sa) of the chuck gripping portion. . Therefore, in this case, each receiving side chuck 2
A large load is concentrated on the corners Sa, Sa at both ends which are gripped at 1, 21 and a large load is applied, and the fabric at the gripped portion is easily damaged.

The cloth spreading machine of each embodiment of the present application is provided with a pulling device 7 for improving the problem that the cloth at the chuck holding portion is easily damaged when the cloth is spread.

The pulling device 7 used in the first embodiment shown in FIGS. 3 to 7 includes a vertically long swing arm 71, an air cylinder 72 for swinging the swing arm 71 in the front-rear direction, and a swing arm. A vacuum belt 73 attached near the lower end of the base 71;
A motor 74 for driving the vacuum belt 73 and a vacuum fan 75 for sucking air inside the vacuum belt 73 are provided.

As shown in FIG. 4, the swing arm 71 is formed in a vertically long shape having a pair of left and right side plates. Also, this rocking arm 7
Reference numeral 1 denotes an empty space between the two loading devices 1 and 1 (the left and right central portions of the spreading machine), and the upper end thereof is pivotally supported at a suitable position of the loading device 1. The swing arm 71 can swing its lower part back and forth by an air cylinder 72.

The vacuum belt 73 has a number of small intake holes. And this vacuum belt 7
3 is installed so that it can circulate up and down at the tip of the swing arm 71. The left and right openings of the vacuum belt 73 are closed by respective side plates of the swing arm 71. The rear surface of the vacuum belt 73 (the right surface in FIG. 3) projects substantially flush with the rear surface of the swing arm 71 or slightly behind (the right side in FIG. 3) the rear surface of the swing arm. When the vacuum belt 73 swings rearward as shown in FIGS. 6 and 7, the vacuum belt 73 comes into contact with the vicinity of the center Sb of the upper side of the cloth S ₂ suspended by the receiving chucks 21 and 21. I am getting it.

The vacuum belt 73 includes a motor 74
Thus, the rear side of the belt is driven to run upward. Also, the air in the vacuum belt 73 is
It is sucked (reference A) by the vacuum fan 75.
When the rear surface of the vacuum belt 73 comes into contact with the cloth while the motor 74 and the vacuum fan 75 are operating,
While adsorbing cloth on the back of the vacuum belt,
It acts to lift the cloth suction portion upward.
The lifting speed of the central portion of the cloth by the vacuum belt 73 is low.

The cloth spreading machine of the first embodiment shown in FIGS. 3 to 7 operates as follows. First, as shown in FIGS. 3 and 4, an operator finds corners Sa, Sa at both ends of one side of the cloth S to be spread, and causes the chucks 11, 11 of the charging device 1 to grip them, respectively. In this embodiment, one loading device 1 is provided on each of the left and right sides of the pulling device 7, and while one loading device 1 is in use, the other loading device 1 is ready to grip the next cloth. Can be. Then, after the loading-side chucks 11 and 11 grip the corners Sa and Sa at both ends of the cloth, when the start button of the usage-side loading device 1 is pressed, the loading-side chucks 11 and 11 move upward. , each chuck grip once was cloth across corners Sa, Sa is automatically delivered to the chuck 21 of the right and left stretched apparatus 2 (the state of S ₁ in FIG. 4). At this time, the swing arm 71 of the pulling device 7 is stopped at the position of swinging toward the near side, and the cloth S suspended by the receiving chucks 21 and 21 is stopped.
₁ is located on the back side of the position of the swing arm 71 as shown in FIG. Next, from the state shown in FIG.
There was left moves to the position of FIG. 5, the central portion in the width direction of cloth S ₂ causes the position to correspond to the pulling device 7. continue,
The motor 74 of the lifting device 7 is operated to run the vacuum belt 73, and the vacuum fan 75 is operated (intake A) to suck the inside of the vacuum belt 73. Then, in this state, the air cylinder 72 is extended, and the swing arm 71 swings rearward as shown in FIGS.
Cloth S hanging on the rear surface of the vacuum belt 73
₂ Contact near the center Sb of the upper side. Then, the rear surface of the vacuum belt 73 is sucked into its inner surface,
In addition, since the rear surface of the vacuum belt runs upward, it acts to slowly lift the central portion in the width direction of the cloth sequentially while adsorbing the vicinity of the upper side central portion Sb of the cloth at the rear surface of the vacuum belt. Further, at the same time as the cloth lifting operation by the vacuum belt 73, the receiving-side chucks 21 and 21 holding the corners Sa and Sa of the cloth.
1 is operated in the lateral spacing direction, it is stretched a cloth upper portion to tension (cloth is in a state of reference numeral S _3). afterwards,
Immediately, the feed roller 35 is rotated to the feed side, and the switching damper 53 is switched to the side shown by the chain line. Then, the bottom side of the cloth S which is suspended from the receiving side chuck 21 is sucked into the suction box 31, the entire cloth is deployed in a square shape (via the state of S ₄ in FIG. 3 S _{5 in} FIG.
State).

In the first embodiment, the cloth lifting operation by the vacuum belt 73 starts when the two receiving chucks 21 and 21 are positioned so as to straddle the pulling device 7 as shown in FIG. During the suction operation by the device 3 (while the switching damper 53 is switched to the side shown by the dashed line), the suction operation is continued, and almost simultaneously with the completion of the suction operation of the suction device 3 (the vacuum fan 75 on the pulling device 7 side). Is turned off). in this case,
At the position closer to the center in the width direction of the cloth, the upward cloth lifting force by the vacuum belt 73 and the downward cloth suction force by the suction device 3 act, but the cloth raising operation and the cloth suction operation are performed. When the cloths are terminated almost simultaneously, the cloths can be expanded in a rectangular shape without any trouble even if the cloths are lifted up.

Thereafter, the upper end of the cloth S ₅ suspended in an extended state by the two receiving chucks 21 and 21 is removed.
After being transferred onto a front conveyor (vacuum conveyor) 61 via the transfer device 4 (reference numeral S _{6 in} FIG. 3), the sheet is conveyed to the press via the rear conveyor 62. When both the receiving chucks 21 and 21 release the cloth corners Sa and Sa, the receiving chucks 21 and 21 are set at predetermined standby positions (for example, positions corresponding to the left loading device 1 in FIG. 4).
The air cylinder 72 of the swing arm 71 of the pulling device 7 also contracts and returns to the original standby position.

As described above, in the cloth spreading machine of the first embodiment, each of the receiving-side chucks 21 and 21 holding the both-end corners Sa and Sa of the cloth is positioned as shown in FIG. 5 (position straddling the pulling device 7).
At the time of moving to the vacuum belt 7 of the pulling device 7
3 contacts the vicinity of the upper center Sb of the cloth and acts to lift up the vicinity of the upper center Sb of the cloth, and accordingly, the load of the cloth on the chuck gripping portions (both corners Sa, Sa). The burden is reduced. Therefore, the cloths should be
Even in the case where the cloth is suspended in the state of being suspended in 1 and 21, the degree of damage to the fabric at the chuck holding portion is reduced, and the useful life of the cloth can be extended.

The second embodiment shown in FIG. 8 and FIG.
The modification of the pulling-up apparatus 7 in the cloth spreading machine of embodiment is shown. The lifting device 7 according to the second embodiment includes a chuck device 78 on a slider 76 that moves up and down along a rodless cylinder 77. This chuck device 78
Is configured such that the two upper and lower sandwiching rollers 79, 79 can be rotated in the directions of the arrows, respectively, and can be opened and closed between the separated state shown in FIG. 8 and the joined state shown in FIG. The slider 7 to which the chuck device 78 is attached is attached.
6 can be swung back and forth by an air cylinder 72. Further, a blower 80 for blowing pressurized air B toward the chuck device 78 is provided at a position facing the chuck device 78 with the cloth S ₂ suspended from the receiving chuck 21 interposed therebetween.

The pulling device 7 of the second embodiment
Works as follows. The state shown in FIG. 8 corresponds to the state shown in FIG. 5 of the first embodiment.
It has suspended the cloth S ₂ in in gripping the state. Then, from the state shown by the solid line in FIG. 8, the air cylinder 72 is first extended to move each of the sandwiching rollers 79, 79 of the chuck device 78 to the position shown by the chain line (reference numeral 79 '). The air B is blown out. Then, cloth S
₂ near the center Sb of the upper side is pushed between the sandwiching rollers 79 'and 79' as shown by the symbol Sb '.
Immediately after the zero operation, the sandwiching rollers 79 ', 79' are closed, and the upper central portion Sb of the cloth is sandwiched between the sandwiching rollers 79, 79 as shown in FIG. The rotation of the sandwiching rollers 79, 79 is stopped almost simultaneously with the closing operation.
Then, as shown in FIG. 9, after holding the upper central portion Sb of the cloth with the two sandwiching rollers 79, 79, both the receiving side chucks 2 are held.
At the same time as the separating operation (expanding operation of the upper side of the cloth), the slider 76 is moved up along the rodless cylinder 77 to almost the same height as the receiving-side chuck 21 (height 76 '). When the slider is moved up to the position indicated by reference numeral 76 'in this manner, each receiving chuck 21 (two locations)
The corners Sa, Sa at both ends gripped by the above and the center Sb ″ of the upper side held by the chuck device are located at substantially the same height, and the upper side of the cloth is stretched in a straight line. .
Also in the case of the second embodiment, after the upper side of the cloth is spread, the feed roller 35 and the suction device 3 shown in FIG. 3 are operated to spread the cloth in a square shape. It is preferable that the chuck device 78 be kept in a closed state until the suction operation of 3 is completed. Then, when the upper side of the cloth is transferred to the delivery device side, the chuck devices 78 of the pulling device 7 and the two receiving chucks 21 (two) are simultaneously released.

The pulling device 7 according to the third embodiment shown in FIG.
The vacuum box 81 with the vacuum fan 82 is attached to the lower end of the rodless cylinder 83 so that the suction surface 81a of the vacuum box 81 can adsorb the vicinity of the upper center Sb of the cloth. The rodless cylinder 83 can slide with respect to the holding portion 83a. The holding portion 83a can be vertically swung by an air cylinder 84.

The lifting device 7 of the third embodiment shown in FIG. 10 operates as follows. That is, in a state where the intake of the vacuum fan 82 from the actuated allowed by suction surface 81a, and is joined to the upper side central portion Sb of textiles S ₂ as shown the vacuum box 81 by the reference numeral 81 ', the fabric such upper central portion Sb 'Is adsorbed on the suction surface 81a'. And
From this state (the state where the vacuum box is 81 '),
By moving the receiving-side chucks 21 (there are two) in the separating direction, at the same time, by sliding the rodless cylinder 83 and tilting the holding portion 83a, the receiving-side chucks 21 indicated by reference numeral 81 ″ are shown in the vacuum box.
(At this time, the center of the upper side of the cloth is the position of the symbol Sb ″).
When the upper side of the cloth is transferred to the delivery device side, the suction of the vacuum box 81 of the pulling device 7 is stopped and each of the receiving chucks 21 (two) is released.

The pulling device 7 of the fourth embodiment shown in FIG.
10 shows a modification of FIG. 10, in which a chuck device 86 that can open and close two holding pieces 87, 87 is attached to the lower end of a rodless cylinder 83. And
Also in the case of the fourth embodiment shown in FIG.
Chain line illustrates 'to, swung to a position corresponding to the upper central portion Sb of cloth S ₂ which are suspended on both receiving chuck 21, where the sandwiching pieces 87 (reference numeral 86)', 8
7 ', the central portion Sb of the upper side of the cloth is gripped as shown by reference numeral Sb', and then the receiving side chucks 21 (there are two) are respectively moved in the separating direction, and at the same time, the chuck device is shown by reference numeral 86 ". It is moved upward to the same height position as the receiving side chuck 21 (at this time, the central part of the upper side of the cloth is denoted by S
Then, when the upper side of the cloth is transferred to the delivery device side, the chuck devices 86 "of the pulling device 7 and the two receiving-side chucks 21 (two) are released.

In each of the embodiments shown in FIGS. 8 to 11 as well, the receiving chucks 21 and 21 of the right-and-left expanding device 2 move in the separating direction while holding the corners Sa and Sa at both ends of the cloth. At the same time, since the lifting device 7 holds and lifts the vicinity of the central portion Sb of the upper side of the cloth, it is possible to reduce the load burden on the cloth at the chuck holding portion. In the case of using the suction device 3, the cloth suspended by the receiving side chucks 21 and 21 is subjected to downward tension during the suction operation, but the pulling device 7 is stopped until the suction operation of the suction device 3 stops. If the holding function of the upper side central portion Sb of the cloth is continued, the protection of the cloth at the chuck holding portion can be further performed.

[0036]

According to the cloth spreading method of the first aspect of the present invention and the cloth spreading machine of the second aspect of the present invention, both ends corners S of one side of the cloth are provided.
Even when the a and Sa are stretched while being held by the chucks 21 and 21, respectively, the stretching operation is performed while holding the vicinity of the upper side central portion Sb of the cloth and pulling it upward. Therefore, the load on the chuck gripping portions (both corners Sa, Sa) of the cloth can be reduced correspondingly.

Therefore, according to the invention of each claim of the present application,
This has the effect that the fabric at the chuck gripping portion is less likely to be damaged, and the durable period of the fabric during the fabric spreading operation can be extended.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a conventional cloth spreading machine.

FIG. 2 is a left side view of FIG.

FIG. 3 is a longitudinal sectional view of the cloth spreading machine of the first embodiment of the present application.

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a state change diagram from FIG.

FIG. 6 is a vertical sectional view of a central portion of FIG. 5;

FIG. 7 is a partially enlarged view of FIG. 6;

FIG. 8 is a partially enlarged view of a cloth spreading machine according to a second embodiment of the present application.

FIG. 9 is a state change diagram from FIG.

FIG. 10 is a partially enlarged view of a cloth spreading machine according to a third embodiment of the present application.

FIG. 11 is a partially enlarged view of a cloth spreading machine according to a fourth embodiment of the present application.

[Explanation of symbols]

1 is a loading device, 2 is a left and right expanding device, 3 is a suction device, 7 is a pulling device, 11 is a loading chuck, 21 is a receiving chuck, and 22 is a left and right moving device. 31 is a suction box, 71 is a swing arm, 73 is a vacuum belt, 74 is a motor, 75 is a vacuum fan, 76 is a slider, 77 is a rodless cylinder, 78 is a chuck device, 80 is a blower, and 81 is a blower.
Is a vacuum box, 82 is a vacuum fan, 83
Is a rodless cylinder, 86 is a chuck device, S is cloth, Sa is a corner at both ends, and Sb is a central portion on the upper side.

Claims (2)

[Claims] An end (Sa, Sa) of one side of a large-area cloth (S) such as a sheet is attached to a pair of chucks (21, 21).
In the state where the cloth (S) is lifted up to a predetermined height in the state where the cloth (S) is gripped in step 21), the cloth (S) is stretched in a hung state by separating the chuck gripping portions of the cloth (S) from side to side. A stretching method, wherein, when separating each chuck gripping portion of the cloth (S) from side to side, the vicinity of a central portion (Sb) of the upper side of the cloth (S) is held and the holding portion is pulled up. A cloth spreading method characterized by being performed while performing. 2. A pair of chucks (21, 2), which are provided at both corners (Sa, Sa) of one side of a large-area cloth (S) such as a sheet.
In a state where the cloth (S) is lifted up to a predetermined height position in the state where the cloth (S) is gripped in step 21) and the chucking portions of the cloth (S) are separated to the left and right, the cloth (S) can be stretched in a hung state. A similar stretching machine, wherein the cloths (S) are gripped and lifted at both corners (Sa, Sa) of the cloths (S) by the chucks (21, 21).
A cloth spreading machine, comprising: a lifting device (7) capable of holding and lifting the vicinity of the center of the upper side (Sb).