JP2000296599A - Screen mesh tensioning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen mesh tensioning apparatus hard to tear a screen mesh. SOLUTION: A tensioning apparatus is constituted of a base stand 3 arranged around a screen form 2, a large number of the stretchers 4 fixed on the base stand in opposed relationship, the clamp members 6 fixed so as to be freely slide before and behind by the stretchers 4 and holding the end parts of the screen mesh 5 placed on the screen form 2 to grasp the same and a lifter for raising and lowering the screen form 2. Tension is applied to the screen mesh 5 grasped by the clamp members 6 by expanding the interval between the clamp members 6 opposed to each other to provide the screen mesh 5 to the screen form under tension. The clamp members 6 grasping the end parts of the screen mesh 5 are supported on the stretchers 4 in a freely variable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen mesh tightening device which is not easily broken when a screen plate for screen printing is manufactured by stretching a screen mesh on a screen form.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a screen plate for screen printing by tightening a screen mesh 5 on a screen form 2, usually a screen in which several air stretchers 4 are arranged to face each other. Mesh tightening device 1
Alternatively, the end 5a of the screen mesh 5 is gripped by the clamp member 6 using the screen mesh tightening device 1 provided with the motor stretcher 16 having the interval adjusting mechanism 14, and the air stretcher 13 is used. Alternatively, the screen form 2 is pulled by the motor stretcher 16 and tightened. That is, the screen mesh tightening device 1 in which the former air stretcher 13 is provided.
As shown in FIG. 1, two or more sets of air stretchers 13 capable of expanding and contracting the piston 9 by supplying compressed air are provided so as to face each other. After the end 5a of the screen mesh 5 is clamped by the clamping portion 8 of the clamp member 6 attached to the tip of the piston 9 of the air stretcher 13, the piston 9 supporting the clamp member 6 By supplying compressed air into the air tank of the air cylinder 12 formed on the base end side and contracting the piston 9, the screen mesh 5 is pulled from both ends, and an appropriate tension is applied to the screen mesh 5. At this point, the screen form 2 is brought into contact with the adhesive, the adhesive 23 and the like are applied to the screen form 2 and the screen mesh 5 and dried. And, he had stretched the screen mesh 5 to the screen frame 2.

In the screen mesh tightening device 1 provided with the motor stretcher 16, the driving motor 15 is driven between the holding portions 8 of the clamp portion 6 for holding the ends 5a of the screen mesh 5. The screen mesh 5 is pulled from both ends using a screen mesh tightening device 1 provided with a motor stretcher 16 having an interval adjusting mechanism 14 for adjusting the interval between the two clamp members 6, and an appropriate tension is applied to the screen mesh 5. Was given, the screen form 2 was abutted, an adhesive 22 or the like was applied to the screen form 2 and the screen mesh 5, dried and fixed, and the screen mesh 5 was stretched on the screen form 2. .

[0004]

However, if the operating speed of the piston 9 of the air stretcher 13 fluctuates or the screen mesh 5 of the motor stretcher 16 fluctuates, the tension of the screen mesh 5 will be reduced. Screen mesh 5 which is stretched on the screen form 2 because it directly affects
This affects the way in which it is stretched. Therefore, it is always managed whether the operation state of the piston 9 of the air stretcher 13 is always in a normal state, or whether the screen mesh 5 of the gap adjusting mechanism 14 of the motor stretcher 16 is held in a uniform state. If not, the tension applied to the central portion, the peripheral portion, and the four corners of the screen mesh 5 will vary, and the printed matter will be distorted during printing after plate making, and the screen mesh 5 will be broken. Things happen. As shown in FIG. 2, a large number of the pistons 9 of the air stretcher 13 and the motor stretcher 16 are normally disposed at right angles to the screen form 2, and Since the attachment portion 8 also grips the screen mesh 5 in the right angle direction, the screen mesh 5 is gripped by both the clamp members 6 at a location adjacent to the corner 2a of the screen form 2 as shown in FIG. Since it is pulled from both directions by the piston 9, a break 5b often occurs at a location adjacent to the corner 2a.

In general, in a screen mesh 5 woven by plain weave or twill weave, if the tension is applied in a direction perpendicular to the direction in which the fibers are woven theoretically, the tear 5b at the corner 2a is unlikely to occur. It is supposed that such a break 5b at the corner 2a is likely to occur even in the screen mesh 5 woven by plain weave, and the cause thereof has not yet been sufficiently elucidated. However, the air stretcher 13 and the motor stretcher 16 have 4 to 8 small screen form frames 2 and 40
About 50 clamp members 6 are used, and generally,
Since a tension as large as about 1 ton / cm ² is applied to the air stretcher 13 and the motor stretcher 16, even a slight non-uniformity of the tension causes tear 5b. It was not easy to manage whether the tension was even. In addition, even with the screen mesh 5 stretched with an appropriate tension in this way, the tension easily changes with the lapse of time, because the screen mesh 5 begins to stretch again due to the stretching caused by the characteristics of the material of the screen mesh 5 itself. And it must be re-tensioned. Since the tension is applied several times before the material of the screen mesh 5 itself is almost completely stretched, the tension of the screen mesh 5 is measured and the tension is re-applied each time. Such work has to be done with care and is cumbersome. Therefore, it has not been easy to effectively control the tension of the screen mesh 5 in practice.

[0006]

The present inventors have conducted intensive studies in view of the above problems, and as a result, the tensioned screen mesh 5 is broken particularly near the corner 2a of the screen form 2. Since it was found that there were many cases, it was found that a particularly strong tension was applied to the screen mesh 5 near the corner 2a of the screen form 2, and as a result of various studies, By variably supporting the clamp member 6 of the screen mesh 5 near the corner 2a of the screen form 5, breakage of the screen mesh 5 near the corner 2a of the screen form 2 can be significantly reduced. Thus, the present invention has been completed based on the above knowledge.

That is, the screen mesh tightening device of the present invention comprises a base provided around a screen form, a plurality of stretchers fixed on the base in opposition to each other, A clamp member that is slidably fixed back and forth by the stretcher, and that sandwiches and grips an end of a screen mesh placed on a screen form,
A lifting device that lifts and lowers the screen form. The screen mesh held by the clamp member is tensioned by increasing the distance between the opposed clamp members, and the screen mesh is stretched on the screen form. In the screen mesh tightening device for setting, a clamp member for gripping an end of the screen mesh is variably supported by a stretcher.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [I] Screen Mesh Tightening Device FIG. 1 is a side view of a screen mesh tightening device 1 of the present invention, and FIG. 2 is a screen mesh tightening device 1 of FIG.
FIG. As shown in FIGS. 1 and 2, a screen mesh tightening device 1 of the present invention includes a screen form 2.
, A plurality of stretchers 4 fixedly opposed to each other on the base 3, and fixed by the stretchers 4 so as to be slidable back and forth. It is basically composed of a clamp member 6 for holding and holding the end 5a of the screen mesh 5 placed on the frame 2 and an elevator 7 for moving the screen form 2 up and down.

(1) Base The base 3 constituting the screen mesh tightening device 1 of the present invention is disposed around the screen form 2 as shown in FIG. A plurality of stretchers 4 are fixed to face each other, and a clamp member 6 for holding and holding an end 5a of a screen mesh 5 placed on the screen form 2 is attached to the stretchers 4. Are slidably fixed back and forth.

(2) Clamp Member As shown in FIGS. 1 and 2, a large number of clamp members 6 constituting the screen mesh tightening device 1 of the present invention are opposed to each other on the outer periphery of the screen form 2. The base is arranged to sandwich and hold the end 5 a of the screen mesh 5. Each of the clamp members 6 arranged opposite to each other is fixed slidably back and forth by a stretcher 4 so that the distance m between the clamping portions of the opposed clamp members 6 can be increased. It is arranged to be able to. As shown in FIG. 1, the clamp member 6 is configured to hold the end portion 5 a of the screen mesh 5 spread on the screen form 2 by holding the end portion 5 a from the upper surface side and the lower surface side. 3 and a locking portion 1 in which the holding portion 8 is locked to the piston 9 of the stretcher 4 so that the direction of the holding portion 8 can be changed depending on the magnitude of the tension.
It is basically composed of 0. The holding portion 8 attached to the tip of the clamp member 6 can apply even tension to the entire screen mesh 5.
The screen mesh 5 is divided into several parts along the outer periphery of the end part 5a and arranged. As shown in FIG. 3, the piston 9 of the stretcher 4 described below is disposed on the holding portion 8 of the clamp member 6 in a direction perpendicular to the length direction L of the holding portion 8 of the clamp member 6, A pin 11 is inserted into a hole 8a at the center of the holding portion 8 and a hole 9a of the piston 9.
And the like, and the holding portion 8 is rotatably supported by the piston 9.

(3) Stretcher As shown in FIGS. 1 and 5, the stretcher 4 constituting the screen mesh tightening device 1 of the present invention is located on the rear side of the central locking portion 10 of the clamp member 6. Alternatively, a stretcher 4 is disposed on the lower side, and is formed so that the entire clamp member 6 can be slid back and forth by expansion and contraction of the stretcher 4. The stretcher 4 generally slides the clamp member 6 back and forth to extend the distance m between the opposing clamping portions 8 of the clamp member 6 to apply tension to the screen mesh 5, and thus, usually, FIGS. As shown in FIG. 2, the compressed air is introduced into the air cylinder 12 disposed on the rear side of the clamp member 6 or the compressed air is released, and the piston 9 is expanded and contracted from the air cylinder 12 to clamp the air. An air stretcher 13 is provided to extend the distance m between the opposing clamping portions 8 of the clamp member 6 by sliding the entire member 6 in the front-rear direction, or alternatively, as shown in FIGS. Motor stretcher for driving the motor 15 of the interval adjusting mechanism 14 disposed at the center lower side to increase the distance m between the opposed clamping portions 8 of the clamp member 6. 6 can be the provision.

Air stretcher Air stretcher 13 as the stretcher 4
When compressed air is used, as shown in FIG. 1, compressed air is supplied or exhausted into the air cylinder 12, and the pressure of the compressed air causes the partition wall 12a to move back and forth.
The clamp member 6 can be slid back and forth by the piston 9 fixed to 2a expanding and contracting the air cylinder 12.

Motor stretcher The motor stretcher 1 is used as the stretcher 4.
In the case where the screen mesh 5 is used, as shown in FIG. 5, an end of the screen mesh 5 is provided by a clamping portion 8 attached to the tip of several clamp members 6 arranged along the outer periphery of the screen mesh 5. After gripping the portion 5a, the driving motor 15 of the interval adjusting mechanism 14 disposed below the screen mesh 5 is driven to transmit the rotational force of the sprocket 17 to the V-belt 18, and the V-belt 18 The rod-shaped rotating shaft 20 is transmitted to the hung sprocket 19 and is fixed to the sprocket 19 to rotate.
By widening the distance m between the opposing clamp members 6 by the bearing portions 21 screwed with the screen mesh 5, tension can be applied to the screen mesh 5 sandwiched and held by the clamp members 6.

Motor stretch with tension adjusting mechanism
When the motor stretcher 16 is used,
As shown in FIG. 5 and FIG.
By using the air stretcher 13 as a tension adjusting mechanism 22 by using the inside of the air cylinder 12 of the air stretcher 13 as compressed air at a constant pressure, the clamp member 6 is fixed directly to the motor stretcher 16. By fixing the clamp member 6 via the air cylinder 12 without attaching, the operation state of the motor stretcher 16 is indirectly transmitted to the screen mesh 5 of the air stretcher 13 and a tension is applied at a constant air pressure. Therefore, tension can be applied to each clamp member 6 with a constant tension,
It is preferable that the displacement of the operation state of each motor stretcher 16 is not directly transmitted to the screen mesh 5, and the breakage of the screen mesh 5 can be significantly reduced. Further, by providing the limit switch 12b in the air cylinder 12, the tension can be controlled to be constant and the tension can be automatically increased.

(4) Elevator for Screen Form The elevator 7 of the screen form 2 constituting the screen mesh tightening device 1 of the present invention is a screen mesh stretched by the screen mesh tightening device 1 of the present invention. 5, the screen form 2 is raised from below the screen mesh 5, and the screen form 2 is pressed against the screen mesh 5.
An adhesive 23 such as an epoxy resin is applied from above the screen mesh 5, cured and dried to form the screen form 2.
And the screen mesh 5 can be stretched on the screen form 2.

[II] Tightening Method of Screen Mesh (1) Grasping of Screen Mesh To manufacture a screen plate for screen printing by stretching the screen mesh 5 on the screen form 2, first, the screen mesh of the present invention is used. A screen form 2 is arranged at the center of the tightening device 1 and a screen mesh 5 is placed on the screen form 2.
Is placed, and the end 5a of the screen mesh 5 is clamped by the clamping portion 8 of the clamp member 6 from the upper surface side and the lower surface side.

(2) Operation of the Stretcher Then, compressed air is introduced into the air cylinder 12 of the stretcher 4 and the piston 9 of the air cylinder 12 is moved.
To reduce the distance between the clamp members 6 by sliding the entire clamp member 6 to reduce the screen mesh 5.
Give tension.

(3) Operation of the clamping portion of the clamp member The screen mesh 5 to which the tension is applied is designed so that the tension applied to the central portion, the peripheral portion, and the four corners of the screen mesh 5 hardly varies in strength. The clamping portion 8 of the clamp member 6 is rotated around the pin 11 inserted into the central hole of the clamping portion 8 so as to be variable depending on the strength of the tension given by each of the portions. The moving distance of one end of the holding portion 8 on which the strong tension is applied is reduced, and the moving distance of the other end of the holding portion 8 on which the low tension is applied is increased. The tension applied to both ends of the portion 8 is stabilized in a balanced state, and as a result, the length direction L of the holding portion 8 is inclined by α from the direction perpendicular to the piston 9, and Equalize the tension of the stretcher 4 and Thus, an even tension can be given to the entire menu 5 without unevenness. In particular, in the vicinity of the corner 2a of the screen form 2 of the screen mesh 5, as shown in FIG. 3, the holding portion 8 of the clamp member 6 is inclined to provide an even tension. Therefore, as shown in FIG. 4, if the holding portion 8 of the clamp member 6 does not always incline in a direction perpendicular to the piston 9, a strong tension is generated near the corner 2 a of the screen form 2 of the screen mesh 5. The screen mesh 5 may be broken by being bridged.

(4) Operation of the elevator The screen mesh 5 is maintained in a state in which an appropriate tension is applied, and the elevator 7 of the screen form 2 is operated to bring the screen form 2 into contact with the screen mesh 5. .

(5) Fixation The screen mesh 5 in contact with the screen form 2
Then, an adhesive such as an epoxy resin or the like was applied from above the screen mesh 5, cured, dried and fixed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The screen mesh tightening device of the present invention will be specifically described below with reference to embodiments. Screen Mesh Tightening Device A screen form 2 having a length of 95 cm × 95 cm is placed on a lift 7 at the center of the screen mesh tightening device 1 as shown in FIGS. Of screen mesh 5 was put on. As shown in FIG. 2, three sets of clamp members 6 and air stretchers 13 are arranged around the screen form 2 in a direction perpendicular to the long side 2b of the screen form 2, as shown in FIG. A base 3 on which two sets of clamp members 6 and an air stretcher 13 are arranged is disposed in a direction perpendicular to the short side 2c of the base 2.

As shown in FIG. 1, an air stretcher 13 is fixed on the base 3, and the piston 9 in the air cylinder 12 of the air stretcher 13 is fixed.
A clamp member 6 formed to be slidable back and forth by the expansion and contraction of the piston 9 is fixed to the distal end of the clamp member 6.

As shown in FIG. 2, a clamping portion 8 is provided at the tip of the clamp member 6 in a direction perpendicular to the piston 9.
The holding portion 8 is attached at the center in the length direction L. Some of the holding portions 8 are arranged in the length direction and are arranged along the outer periphery of the end portion 5 a of the screen mesh 5. By raising the lever 24, the holding portion 8 at the tip of the clamp member 6 holds the end portion 5a of the screen mesh 5 from the upper surface side and the lower surface side and firmly grips it. The connection between the holding portion 8 and the piston 9 is
The pin 1 of the piston 9 is inserted into the hole 10a of the locking portion 10
1 is inserted, and the holding portion 8 is rotatably supported by the piston 9.

The compressed air in the air tank 25 is supplied into the air cylinder 12 of the air stretcher 13.
The pressure is supplied through the pressure controller 26 and the valve 27, the piston 9 of the air cylinder 12 is contracted to increase the distance m between the holding portions 8 of the clamp member 6, and the screen mesh 5 is supplied with 5 kg.
/ Cm ² tension. Then, while maintaining this state, a constant tension is continuously applied to the screen mesh 5. However, after a while, the screen mesh 5 is stretched and the tension is loosened. Therefore, compressed air is supplied again into the air cylinder 12, and the piston 9 of the air cylinder 12 is further contracted to reduce the distance m between the clamping portions 8 of the clamp member 6. The screen mesh 5 is further expanded, and a tension of 4 kg / cm ² is applied again to the screen mesh 5. Then, the screen mesh 5 is held in a state where a predetermined tension is hung thereon, and the elevator 7 of the screen form 2 is operated,
The screen form 2 is brought into contact with the screen mesh 5.
Screen mesh 5 in contact with this screen form 2
Then, an adhesive 23 such as an epoxy resin or the like was applied from above the screen mesh 5, cured, dried, and fixed.

[0025]

According to the screen mesh tensioning device of the present invention, since the clamping portion of the clamp member is formed to be tiltable, it is possible to apply uniform tension to both ends of the clamping portion of the clamp member. Even in the vicinity of the corner of the screen form of the screen mesh, the screen mesh is not broken. Eliminating such a variation in tension prevents the screen mesh from being partially tensioned more than necessary, so that the tension of the screen mesh can be made uniform.

[Brief description of the drawings]

FIG. 1 is a side view of a screen mesh tightening device of the present invention.

FIG. 2 is a plan view of the screen mesh tightening device of FIG. 1;

FIG. 3 is a plan view of a clamp member and an air stretcher which nipably and variably support and hold an end of a screen mesh with a clamp portion of the clamp member of the screen mesh tightening device of the present invention. FIG.

FIG. 4 is a plan view of a clamp member and an air stretcher that clamp and hold an end portion of a screen mesh in a clamp portion of the clamp member so that the end portion of the screen mesh remains unchanged.

FIG. 5 is a side view of an apparatus for tightening a screen mesh using a motor stretcher.

FIG. 6 is a plan view of an apparatus for tightening a screen mesh using the motor stretcher of FIG. 5;

[Description of Signs] 1 Screen mesh tightening device 2 Screen form 2a Corner 2b Long side 2c Short side 3 Base 4 Stretcher 5 Screen mesh 5a End 5b Rupture 6 Clamp member 7 Elevator 8 Clamping section 8a Hole 9 Piston 9a Hole 10 Locking portion 10a Hole 11 Pin 12 Air cylinder 12a Partition wall 12b Limit switch 13 Air stretcher 14 Interval adjustment mechanism 15 Driving motor 16 Motor stretcher 17 Sprocket 18 V belt 19 Sprocket 20 Rod rotation Shaft 21 Bearing part 22 Tension adjusting mechanism 23 Adhesive 24 Lever 25 Air tank 26 Pressure controller 27 Valve

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takashi Takahashi 5-10, Yokokawa, Sumida-ku, Tokyo F-term in Murakami Corporation (reference) 2C035 AA01 FE01 FF02 FF23

Claims (5)

[Claims] 1. A base provided around a screen form, a plurality of stretchers fixedly opposed to each other on the base, and fixed slidably back and forth by the stretchers. And, a clamp member that sandwiches and grips the end of the screen mesh placed on the screen form,
A lifting device that lifts and lowers the screen form. The screen mesh held by the clamp member is tensioned by increasing the distance between the opposed clamp members, and the screen mesh is stretched on the screen form. A screen mesh tightening device, wherein a clamp member for gripping an end of the screen mesh is variably supported by a stretcher. 2. The screen mesh tightening device according to claim 1, wherein the stretcher is an air stretcher or a motor stretcher. 3. The screen mesh tightening device according to claim 1, further comprising an interval adjusting mechanism for adjusting the interval between the opposed clamp members by adjusting the interval between the motor stretchers. 4. The screen mesh tightening device according to claim 3, further comprising a tension adjusting mechanism for adjusting the distance between the opposed clamp members by adjusting the distance between the motor stretchers. 5. The screen mesh tightening device according to claim 1, wherein the clamp member is rotatably fixed to the piston of the stretcher.