HK1131771B - Extending tool of shee-like material - Google Patents

Description

Tensioning device for sheet-like material

Technical Field

The present invention relates to a new structure of a frame for tensioning a screen used in screen printing.

Such frames involve a tensioning device that tensions the laminar material: a sheet-like or net-like sheet-like material made of metal, resin, or the like, such as used in screen printing; sheet-like materials such as canvas used for painting such as oil paintings; and leather or the like stretched over the cylindrical body of a percussion instrument such as a drum.

Background

Heretofore, screen printing plates of a relatively simple structure have been used, in which a metal mesh having poor stretchability is mainly provided in the center thereof, and a web material having a relatively large elasticity is used as a support portion at an edge portion of a portion to be image-formed.

Such a screen is completely different in elasticity and stretchability depending on the size of a predetermined image forming position and the screen material or the like used, so that the screen needs to be adjusted every time the screen is manufactured in order to achieve the desired object for the printed matter, but it is difficult to adjust.

Since the screen used in screen printing is tensioned by tension, the frame needs to have a certain strength to withstand the tension, and the screen frame is made of very strong wood or metal, so that it is heavy and bulky.

Adjusting the side length of such a frame requires large wire drawing devices and is inconvenient to operate.

Further, the screen frame for freely adjusting the side length of the screen frame and the screen hook device for fixing the screen are used in combination to tension the screen and adjust the tension of the screen, but the screen hook device for fixing the screen is not easily attached and detached.

Further, when the printed matter itself is deformed, the screen tension is not uniform, or the deformation and deviation occur in the relief printing, it is difficult to improve the printing accuracy by correction or adjustment.

Further, once the screen is fixed to the screen frame, it is difficult to adjust distortion and deviation of the image.

In a conventional tension device for a sheet-like material formed of an expandable frame body, the tension of the sheet-like material tensioned by the tension device is generally adjusted by adjusting the respective positions of four frame sides one by one to change the distance between the frame sides.

JP-A-1-141027, JP-A-55-136533 and International publication WO92/03231 disclose a tension frame for finely adjusting the tension of a tension web by a plurality of tension fine adjustment mechanisms.

U.S. patent specification No. 3482343, U.S. patent specification No. 3485165, and U.S. patent specification No. 6427588 disclose a tension frame in which a wire net is fixed to a support frame by a tension pile, the support frame is mounted to the tension frame, and a predetermined tension is applied, and then the tension of the tension frame is adjusted by a screw.

U.S. patent specification No. 5113611 discloses a wire mesh tensioning frame in which a wire mesh is secured to a support frame by means of grooves and securing members, the support frame is mounted to a tensioning frame, and then the frame side length is changed by means of a screw mechanism or a hydraulic cylinder.

A tensioning frame for fine-tuning the tension by rotating the tensioning frame for tensioning the wire mesh is disclosed in the specification of us patent 5076162, us 5271171 and us 5265534.

U.S. patent specification No. 5802971 discloses a tension frame in which a wire mesh is fixed to a support frame with an adhesive and applied with a predetermined tension, and then finely adjusted by a screw or a rotating frame member, wherein the support frame is mounted to the tension frame by a tension pile.

However, the above screen tensioning frames have many adjustment places, and since the tension of the other portions is changed by adjusting one portion, it is difficult to tension all portions of the sheet-like material to a desired tension state, and it takes much time to perform the operation of adjusting the tension. In addition, when the screen is attached to the tension frame, it takes a lot of man-hours to attach and detach the screen.

In view of the above, the inventors have disclosed a new structure of a tensioner which is easier to adjust tension than the four tensioning mechanisms disclosed in international publication No. WO 002/55304.

Patent document 1: JP-A-1-141027

Patent document 2: JP-A-55-136533

Patent document 3: international publication No. WO92/03231

Patent document 4: specification of U.S. Pat. No. 3482343

Patent document 5: specification of U.S. Pat. No. 3485165

Patent document 6: specification of U.S. Pat. No. 6427588

Patent document 7: specification of U.S. Pat. No. 5113611

Patent document 8: specification of U.S. Pat. No. 5076162

Patent document 9: specification of U.S. Pat. No. 5271171

Patent document 10: specification of U.S. Pat. No. 5265534

Patent document 11: specification of U.S. Pat. No. 5802971

Patent document 12: international publication No. WO02/55304

The subject of the application is to provide a tension device for sheet material, which can make the tension operation of the sheet material as simple as possible and can tension the whole sheet material with uniform tension with less adjusting parts.

Disclosure of Invention

To solve the above problems, the present invention proposes a tension device for a sheet-like material, which comprises: the rectangular plate is composed of 4 corner members arranged at four vertexes of a rectangle; 4 frame members supported at both ends by the corner members and respectively erected between the adjacent 2 corner members, movable in the direction of the adjacent corner members between the adjacent 2 corner members and movable in a direction approaching or separating from the opposite frame member in relation to the opposite frame member together with the corner members supporting both ends thereof; and 4 guide rods which are respectively arranged between 2 adjacent corner members and penetrate through each frame member, wherein each frame member or each corner member is provided with a hanging part which is hung and buckled on the periphery of the sheet-shaped material.

In all of the above aspects of the sheet-like material tensioning device of the present invention: the moving mechanism is mounted on the corner of the corner member, and is provided with an insert and a ball body which can move in the direction of connecting the corner with the inner side of the rectangle formed by 4 corner members, the ball body is movably arranged in a space which is formed between the top end of the insert and the end part of the guide rod arranged between the corner member provided with the moving mechanism and the adjacent corner member and close to the corner member provided with the moving mechanism, the ball body is arranged between the insert and the end part of each guide rod, and the top end of the insert is always contacted with the end part of each guide rod close to the corner member provided with the moving mechanism.

In this case, the following configuration is possible: a stopper member is disposed in the corner member provided with the moving mechanism, and the stopper member can restrict the movement of the insert in the direction of the center of the quadrangle formed by the 4 corner members.

The present invention also proposes a tension device for a sheet-like material having the following configuration in the above-described basic form. In this tensioning device for sheet-like material: one of the 4 corner members is provided with a moving mechanism which contacts an end portion of the guide rod provided between the adjacent corner members and moves the guide rod to the adjacent corner member, and is fixedly connected to an end portion of the guide rod provided between the adjacent corner member and one of the 2 corner members.

The tension device for sheet-like materials is further provided with a transmission mechanism for converting the movement of 1 guide bar of 2 guide bars extending toward the corner members other than the corner members provided with the moving mechanism toward the direction approaching the corner members into the movement of the other 1 guide bar toward the direction separating from the corner members, and causing the movement of 1 guide bar toward the direction separating from the corner members to drive the other 1 guide bar toward the direction approaching the corner members.

In the tension device for sheet-like materials according to any of the above aspects of the present invention, each frame member has a hollow portion inside. The 4 guide rods, which are respectively provided between the adjacent 2 corner members and pass through the respective frame members, are supported by the support bodies provided at predetermined intervals in the hollow portions of the frame members between the adjacent 2 corner members so as to be located in the hollow portions.

With the tensioning device of the present invention, not only is it easy to tension a sheet-like or net-like sheet-like material made of metal, resin, or the like used in screen printing to a screen tensioning frame, but also the entire sheet-like material can be tensioned with uniform tension with a small number of adjustment portions.

Drawings

Fig. 1 shows an example of the tensioner of the present invention.

Fig. 2 is an explanatory view of the guide bar support body.

Fig. 3 shows another example of the tensioner of the present invention.

Fig. 4 shows another example of the tensioner of the present invention.

Fig. 5 shows an example of a tensioner having a hook portion provided on the inner side of a housing.

Fig. 6 shows another example of the tensioner of the present invention.

Fig. 7 shows another example of the tensioner of the present invention.

Fig. 8 shows another example of the tensioner of the present invention.

Fig. 9 shows an example of the tensioner of the present invention in which a hook portion is formed on the upper surface of the frame side.

Fig. 10 is an explanatory view of a process of tensioning a sheet-like material and adjusting the tension by the tensioning device of the present invention.

Fig. 11 is an explanatory view of a process of tensioning a sheet-like material and adjusting the tension by another tensioning device of the present invention.

Fig. 12 shows another example of the tensioner of the present invention having a hook portion formed on the upper surface of the rim.

Fig. 13 is an explanatory view of a process of tensioning a sheet-like material and adjusting the tension by a further tensioning device of the invention.

Fig. 14 is an explanatory view of a process of tensioning a sheet-like material and adjusting the tension by a tensioning device according to another embodiment of the present invention.

Fig. 15 shows a tensioner having a hook portion provided inside a housing.

Fig. 16 is an explanatory view of a process of tensioning a sheet material and adjusting the tension by a tensioning device provided with a hook portion inside a frame.

Fig. 17 shows an example of a state before the tension device of the present invention tensions the sheet-like material.

Fig. 18 shows a state of the sheet-like material temporarily tensioned in the tensioning device shown in fig. 17.

Fig. 19 is an explanatory diagram of a state in which the sheet-like material is tensioned by performing tension adjustment.

FIG. 20 shows another example of the state of the tension device of the present invention before the sheet-like material is tensioned.

Fig. 21 is a plan view showing a state of a sheet-like material temporarily tensioned in the tensioning device shown in fig. 20.

Fig. 22 is an explanatory view showing a state in which the sheet-like material is tensioned by tension adjustment after the state shown in fig. 21.

Fig. 23 shows an example of a sheet-like material tensioned by the tensioning device of the present invention.

Fig. 24 shows another example of a sheet-like material tensioned in the tensioning device of the invention.

Fig. 25 shows an example of the tensioner of the present invention.

Description of the reference numerals

1 tensioning device for sheet-like material

2. 3, 4, 5 corner component

6. 7, 8, 9 frame member

6a, 7a, 8a, 9a inner sheet

10. 11, 12, 13 guide rod

10a end of a guide rod 10

10b tip of guide rod 10

11a end of the guide bar 11

11b tip of guide rod 11

12a end of guide rod 12

12b tip of guide rod 12

13a end of guide bar 13

13b tip of guide bar 13

14. 15, 20, 21, 26, 27, 32, 33 flange

18. 19, 24, 25, 30, 31, 36, 37 spring

16. 17, 22, 23, 28, 29, 34, 35 corner member outer edge

51. 51a, 52a insert

53. 54, 59, 62T-shaped spanner

55. 56 sphere

57. 58, 60, 61 screw rod

63. 67 cam

63a one side of cam 63

63b the other side of the cam 63

64. 68 fulcrum

67a, 67b side of cam 67

90 hanging buckle projection

91 thin sheet material

92. 93 hanging buckle hole

Protrusion strip for hanging and buckling 96 and 97 grooves

97 grooves provided at the periphery of the sheet-like material 91

98 groove of hanging buckle projection strip 99

99 projecting strips provided on the periphery of the sheet-like material 91

104. 105 corner member

114. 115, 120 connecting sheet

116. 117, 118, 119 pins

131 hanging holes arranged at 4 corners of the sheet material 91

130 protrusions provided on the upper side of the corner member

103b, 103a, 204b, 205a, 205b grooves

104. 105 corner member

106. 107, 108 connecting sheet

109. 110, 111, 112 pins

204. 205, 303 corner component

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1

Embodiment 1 of the sheet material tensioning device of the present invention will be described with reference to fig. 1 and 2.

The tensioning device 1 of a laminar material is provided with 4 corner members 2, 3, 4, 5; 4 frame members 6, 7, 8, 9 and 4 guide rods 10, 11, 12, 13. 4 corner members 2, 3, 4, 5 are provided at the vertices of the rectangle and 4 frame members 6, 7, 8, 9, respectively, are erected between the adjacent 2 corner members.

The frame member 6 is movable towards the adjacent corner members 4, 2; the frame member 7 is movable towards the adjacent corner members 3, 4; the frame member 8 is movable towards the adjacent corner members 5, 3; the frame member 9 is movable towards the adjacent corner members 2, 5.

The frame members 6, 7, 8, 9 are supported at both ends by adjacent corner members, respectively. Thus, the frame member 6 can be moved together with the adjacent 2 corner members 2 and 4 supporting both ends thereof toward and away from the opposite frame member 8; the frame member 8 is movable together with the adjacent 2 corner members 3 and 5 supporting both ends thereof toward and away from the opposite frame member 6; the frame member 7 is movable together with the adjacent 2 corner members 4 and 3 supporting both ends thereof toward and away from the opposite frame member 9; the frame member 9 is movable toward and away from the opposite frame member 7 with the adjacent 2 corner members 5 and 2 supporting the opposite ends thereof.

The arrows 41-48 indicate the moving direction.

Guide rods 10, 11, 12 and 13 penetrating through the frame members 6, 7, 8 and 9 are respectively arranged between the adjacent 2 corner members. Flanges 14, 15 are provided at both ends of the guide bar 10, an elastic body 18 such as a spring is provided between the flange 14 and an outer edge 16 of the corner member 2, and an elastic body 19 such as a spring is provided between the flange 15 and an outer edge 17 of the corner member 4. One end of the guide rod 10 is forced towards the corner member 2 by means of the elastic bodies 18, 19; the other end is forced in the direction of the corner member 4.

Flanges 20, 21 are provided at both ends of the guide bar 11, an elastic body 24 such as a spring is provided between the flange 20 and the outer edge 22 of the corner member 4, and an elastic body 25 such as a spring is provided between the flange 21 and the outer edge 23 of the corner member 3. One end of the guide rod 11 is forced towards the corner member 4 by means of the elastic bodies 24, 25; the other end is forced in the direction of the corner member 3.

Flanges 26 and 27 are provided at both ends of the guide bar 12, an elastic body 30 such as a spring is provided between the flange 26 and an outer edge 28 of the corner member 3, and an elastic body 31 such as a spring is provided between the flange 27 and an outer edge 29 of the corner member 5. One end of the guide rod 12 is forced towards the corner member 3 by means of the elastic bodies 30, 31; the other end is forced in the direction of the corner member 5.

Flanges 32, 33 are provided at both ends of the guide bar 13, an elastic body 36 such as a spring is provided between the flange 32 and an outer edge 34 of the corner member 5, and an elastic body 37 such as a spring is provided between the flange 33 and an outer edge 35 of the corner member 2. By means of the elastic bodies 36, 37, one end of the guide rod 13 is forced in the direction of the corner member 5; the other end is forced in the direction of the corner member 2. Therefore, the urging forces in the direction of separation between the flange of the guide bar and the outer edge of the corner member are all equalized by the respective elastic bodies 18, 19, 24, 25, 30, 31, 36, 37.

Each frame member 6, 7, 8, 9 is provided with a hanging and buckling part which is a protruding part of a hanging and buckling hole, a protruding strip of a hanging and buckling groove or a groove of a hanging and buckling protruding strip formed on the periphery of a sheet material tensioned by hanging and buckling.

The pair of corner members 2, 3 are brought into contact with respective end portions of guide rods 10, 11, 12, 13 provided between the pair of corner members 2, 3 and the other pair of corner members 4, 5, and the guide rods 10, 11, 12, 13 are moved in the direction of the adjacent corner members 4, 5.

Corner member 2 contacts end 10a of guide bar 10 and moves guide bar 10 toward corner member 4, guide bar 10 being disposed between corner member 2 and corner member 4; at the same time, corner member 2 also contacts end 13a of guide rod 13 and moves guide rod 13 toward corner member 5, with guide rod 13 disposed between corner member 2 and corner member 5.

Corner member 3 contacts end 11a of guide bar 11 and moves guide bar 11 toward corner member 4, and guide bar 10 is disposed between corner member 2 and corner member 4; at the same time, corner member 3 also contacts end 12a of guide rod 12 and moves guide rod 12 toward corner member 5, with guide rod 12 being disposed between corner member 3 and corner member 5.

The corner member 2 is provided with a moving mechanism mounted to a corner of the corner member 2 and consisting of an insert 51 and a ball 55, the insert moving mechanism being movable in the directions indicated by arrows 71, 72 to bring the corner into communication with the inside of the quadrangle formed by the 4 corner members 2, 3, 4, 5.

The insert 51 may be, for example, a threaded rod that is inserted into a threaded hole provided at a corner of the corner member 2.

The ball 55 is movably disposed in a space formed by the tip end of the insert 51 and the ends 10a, 13a of the guide rods 10, 13 on the side close to the corner member 2.

The ball 55 is mounted between the tip of the insert 51 and the ends 10a, 13a of the guide rods 10, 13 near the corner member 2 in such a way that it contacts the tip of the insert 51 and the ends 10a, 13a of the guide rods 10, 13 near the corner member 2.

The corner member 3 is provided with a moving mechanism mounted to a corner of the corner member 3 and consisting of an insert 52 and a ball 56, the insert moving mechanism being movable in the directions indicated by arrows 73, 74 to bring the corner into communication with the inside of the quadrangle formed by the 4 corner members 2, 3, 4, 5. The insert 52 is in the illustrated embodiment a threaded rod that fits into a threaded hole provided at a corner of the corner member 3.

The ball 56 is movably arranged in the space formed by the tip of the insert 52 and the ends 11a, 12a of the guide rod 11, 12 close to the corner member 2. The ball 56 is attached between the tip end of the insert 52 and the end portions 11a, 12a of the guide rods 11, 12 near the corner member 3 so as to constantly contact the tip end of the insert 52 and the end portions 11a, 12a of the guide rods 11, 12 (see fig. 1).

The forces applied to the guide bar 10 and the guide bar 13 become equal after the movement of the insert 51 by the transmission of the ball 55 movably disposed in the space formed by the tip of the insert 51 and the ends 10a, 13a of the guide bar 10 and the guide bar 13 near the corner member 2.

The corner member 3 is provided with a moving mechanism mounted to a corner of the corner member 3 and consisting of an insert 52 and a ball 56, the insert moving mechanism being movable in the directions indicated by arrows 73, 74 to bring the corner into communication with the inside of the quadrangle formed by the 4 corner members 2, 3, 4, 5.

The insert 52, for example, may be a threaded rod that is inserted into a threaded hole provided at a corner of the corner member 3.

The ball 56 is movably arranged in the space formed by the tip of the insert 52 and the ends 11a, 12a of the guide rod 11, 12 close to the corner member 2.

The ball 56 is attached between the tip end of the insert 52 and the end portions 11a, 12a of the guide bar 11, 12 near the corner member 3 so as to constantly contact the tip end of the insert 52 and the end portions 11a, 12a of the guide bar 11, 12

The forces applied to the guide rods 11 and 12 are equal after the movement of the insert 52 by the transmission of the balls 56 movably disposed in the space formed by the tip of the insert 52 and the ends 11a, 12a of the guide rods 11, 12 near the corner member 3.

The tension device 1 for sheet-like materials of the present invention is further provided with a transmission mechanism described below.

The transmission mechanism converts the movement of 1 guide bar of 2 guide bars 10, 11 or 12, 13 extending toward the adjacent corner members 4, 5 of a pair of opposed corner members 2, 3 provided with the moving mechanism toward the adjacent corner members 4, 5 into the movement of the other 1 guide bar toward the direction away from the adjacent corner members 4, 5, and causes the movement of one of the 1 guide bars toward the direction away from the adjacent corner members 4, 5 to follow the movement of the other 1 guide bar toward the adjacent corner members 4, 5.

The transmission mechanism is located at the corner member 4 adjacent to a set of opposite corner members 2, 3 provided with a moving mechanism, and is provided with a cam 63 rotatable about a fulcrum 64, wherein the fulcrum 64 is fixed to the corner member 4. One side 63a of the cam 63 contacts the tip 10b of the guide bar 10; the other side 63b of the cam 63 contacts the tip 11b of the guide bar 11.

Such a transmission mechanism, located at the corner member 5 adjacent to the set of opposite corner members 2, 3 provided with a moving mechanism, is provided with a cam 67 rotatable about a fulcrum 68, wherein the fulcrum 68 is fixed to the corner member 5. One side surface 67a of the cam 67 contacts the tip 13b of the guide bar 13; the other side 67b of cam 67 contacts the top end 12b of guide rod 12.

As described above, the moving mechanism provided at the corner member 2 is provided with the insert 51 and the ball 55. The ball 55 is movably attached between the tip of the insert 51 and the end portions 10a, 13a of the corner members of the guide bar 10, 13 so that the tip of the insert 51 and the end portions 10a, 13a of the guide bar 10, 13 are always in contact with each other and the guide bar 10, 13 is close to the corner member 2.

The guide bar 10 is always urged in the direction of the corner member 2 (the direction of the arrow 42) by the springs 18 and 19; the other side receives a force moving in the direction of the corner member 4 (the direction of the arrow 41).

Further, the guide bar 13 is always urged in the direction of the corner member 2 (the direction of the arrow 47) by the springs 36 and 37; the other side receives a force moving in the direction of the corner member 5 (the direction of the arrow 48).

Here, if the insert 51 is rotated after inserting the T-wrench 53 into the insert 51, the insert 51 advances in the direction of arrow 71. At this time, if the force required to move guide bar 13 in the direction of arrow 48 is less than the force required to move guide bar 10 in the direction of arrow 41, the pressure generated by the advancement of insert 51 in the direction of arrow 71 will primarily be used to move guide bar 13 in the direction of arrow 48. Thus, the end 10a of the guide rod 10 remains in contact with the ball 55 during movement in the direction of arrow 42 under the action of the spring 18.

Thus, if the force required to move guide bar 13 in the direction of arrow 48 is equal to the force required to move guide bar 10 in the direction of arrow 41, the pressure generated by the advancement of insert 51 in the direction of arrow 71 is evenly distributed to move guide bar 13 in the direction of arrow 48 and guide bar 10 in the direction of arrow 41. As a result, guide rods 10 and 13 start to move in the directions of arrows 48 and 41, respectively, under the same amount of force.

On the other hand, if the T-wrench 53 is inserted into the insert 51 and then rotated in the opposite direction, the insert 51 will move back in the direction of arrow 72. At this time, if the interference force of the guide bar 10 exerted on the ball 55 is larger than the interference force of the guide bar 13 exerted on the ball 55, the guide bar 10 moves in the direction of the arrow 42 as the insert 51 retreats in the direction of the arrow 72, during which the end 10a of the guide bar 10 is kept in contact with the ball 55.

If the interference force exerted by the guide rod 10 on the ball 55 is equal to the interference force exerted by the guide rod 13 on the ball 55, the guide rod 10 and the guide rod 13 move equally in the direction of arrows 42, 47, respectively, as the insert 51 is retracted in the direction of arrow 72.

Thus, if, for example, the guide bar 13 is moved in the direction of arrow 48 by the above-described transmission mechanism, the cam 67 is rotated about the fulcrum shaft 68 in the direction of arrow 70, thereby moving the guide bar 12 in the direction of arrow 46, that is, converting the movement of one guide bar 13 of the 2 guide bars 13, 12 extending toward the corner member 5 into the movement of the other guide bar 12 away from the corner member 5.

In the tensioner of the present invention, the moving mechanism is provided at a set of opposed corner members 2, 3, respectively, and moves the guide rods 10, 13, 11, 12 toward the adjacent corner members 4, 5 while keeping contact with the end portions 10a, 13a, 11a, 12a of the guide rods 10, 13, 11, 12 provided between the adjacent corner members 4, 5.

The moving mechanism is attached to the corner portions of the corner members 2, 3, and is provided with inserts 51, 52 and balls 55, 56 which are movable in a direction in which the corner portions are linked with the inside of the quadrangle formed by the 4 corner members 2, 3, 4, 5.

The balls 55, 56 are movably provided in a space formed between the tip ends of the inserts 51, 52 and the end portions 10a, 13a, 11a, 12a of the guide bars 10, 13, 11, 12 provided between the corner members 2, 3 provided with the moving mechanism and the adjacent corner members 4, 5, and are attached between the tip ends of the inserts 51, 52 and the end portions 10a, 13a, 11a, 12a of the guide bars 10, 13, 11, 12 so as to be in contact with the tip ends of the inserts 51, 52 and the end portions 10a, 13a, 11a, 12a of the guide bars 10, 13, 11, 12.

Therefore, the guide rods 10, 13, 11, and 12 can be urged while skillfully balancing the forces.

Further, the corner members 2, 3 provided with the moving mechanism are provided with stopper members for restricting the movement of the inserts 51, 52 toward the inside of the rectangle formed by the 4 corner members 2, 3, 4, 5 (i.e., in the directions indicated by the arrows 71, 73).

The stop members are comprised of screw guides 57, 58 that fit into threaded holes provided at the corners of corner member 2 and screw guides 60, 61 that fit into threaded holes provided at the corners of corner member 3.

As shown in fig. 2, each of the frame members 6, 7, 8, and 9 has a hollow portion therein, and 4 guide rods 10, 13, 11, and 12, which are provided between the adjacent 2 corner members and penetrate through the frame members 6, 7, 8, and 9, are supported by support bodies 509 provided at predetermined intervals in the hollow portions of the frame members 6, 7, 8, and 9 between the adjacent 2 corner members and are located in the hollow portions.

A hollow frame member 6 having a rectangular cross section is provided with a support body 509 made of a synthetic resin, and the outer peripheral shape thereof is matched with the cross-sectional shape of the inner wall of the frame member 6 and is provided at a predetermined interval between the adjacent 2 corner members. The guide rod 10 is supported by the support 509 through a through hole provided in the center of the support 509.

With this configuration, even if the guide bars 10, 11, 12, 13 are easily bent due to their long lengths, the guide bars 10, 11, 12, 13 can be stably supported. Thus, on the one hand, the weight of each guide bar 10, 11, 12, 13 can be reduced, and correspondingly the weight of the tensioning device 1, and on the other hand, the guide bars 10, 11, 12, 13 corner members can be stably supported between the adjacent 2 corner members without bending.

Further, if the guide lever 10 is moved in the direction of arrow 42 by the above-described transmission mechanism, for example, the cam 63 rotates in the direction of arrow 66 about the support shaft 64 to move the guide lever 11 in the direction of arrow 44. That is, the movement of one guide bar 10 of the 2 guide bars 11 and 10 extending toward the corner member 4 in the direction away from the corner member 4 also moves the other guide bar 11 in the direction toward the corner member 4.

Similarly, if guide bar 13 is moved in the direction of arrow 47, cam 67 will rotate about fulcrum 68 in the direction of arrow 69 to move guide bar 12 in the direction of arrow 45. That is, by the above-described transmission mechanism, the movement of one guide bar 13 of the 2 guide bars 12 and 13 extending toward the corner member 5 in the direction away from the corner member 5 also moves the other guide bar 12 in the direction toward the corner member 5.

In addition, if the guide bar 10 moves in the direction of arrow 41, the cam 63 rotates about the fulcrum 64 in the direction of arrow 65 to move the guide bar 11 in the direction of arrow 43. That is, the movement of one guide bar 10 of the 2 guide bars 10 and 11 extending toward the corner member 4 in the direction toward the corner member 4 is converted into the movement of the other guide bar 11 in the direction away from the corner member 4 by the transmission mechanism.

The moving mechanism provided in the corner member 2 has been mainly described above, but in fact, the same moving mechanism is provided in the corner member 3 facing the corner member 2, and the same operation is performed.

The amount of screwing in the direction of the arrows 71, 73 of the inserts 51, 52 can be adjusted by moving the threaded rods 57, 58 in the direction of the arrows 75 or 76 or by moving the threaded rods 60, 61 in the direction of the arrows 77 or 78 by means of the T-wrenches 59, 62.

When the tension device of the present invention is used, the sheet-like material is temporarily hooked on the hooking portions of the frame members and the like, and then the guide bars 10, 11, 12, 13 are moved in the directions of the arrows 42, 43, 44, 45, 46, 47, 48 by the moving mechanism, so that the sheet-like material can be easily tensioned.

Further, by the operation of the moving mechanism and the transmission mechanism, the guide rod 10 and the like can be moved with a delicate balance by adjusting the small number of adjustment portions, that is, by operating the small number of moving mechanisms, so that the entire sheet-like material can be tensioned with a uniform tension by the small number of adjustment portions. Example 2

Example 2 will now be described with reference to fig. 3. Note that, the same members as those denoted by the same reference numerals in embodiment 1 shown in fig. 1 will not be described.

Example 2 differs from example 1 in that: in this embodiment, one end of each guide rod 10, 11, 12, 13 extending toward the adjacent corner member 204, 205, which is provided between the pair of opposed corner members 2, 3 provided with the moving mechanism and the adjacent corner member 204, 205, is fixed to the adjacent corner member 204, 205, respectively.

One end of each guide rod 10, 11, 12, 13 extending toward the corner member 204, 205, which is provided between the pair of opposed corner members 2, 3 provided with the moving mechanism and the adjacent corner member 204, 205, is fixed to the corner member 204, 205, respectively.

Flanges 15, 20, 27, 32 are respectively engaged with the grooves 204b, 204a, 205b, 205a, wherein the flanges 15, 20, 27, 32 are formed at the ends of the guide bars 10, 11, 12, 13; grooves 204b, 204a, 205b, 205a are formed in the corner members 204, 205. Since the flange 15 at the end of the guide bar 10 is fitted into the concave groove 204b and the flange 20 at the end of the guide bar 11 is fitted into the concave groove 204a, the ends of the 2 guide bars 10 and 11 extending toward the corner member 204 are fixed to the corner member 204.

Since flange 27 at the end of guide rod 12 is fitted into notch 205b and flange 32 at the end of guide rod 13 is fitted into notch 205a, the ends of 2 guide rods 12 and 13 extending toward corner member 205 are fixed to corner member 205.

Therefore, the tensioner is not provided with a transmission mechanism that converts the movement of 1 guide bar of 2 guide bars extending toward adjacent corner members of a set of opposed corner members provided with a moving mechanism toward the adjacent corner members into the movement of the other 1 guide bar toward a direction away from the adjacent corner members, and causes the movement of 1 guide bar toward a direction away from the adjacent corner members to follow the movement of the other 1 guide bar toward the adjacent corner members.

The tensioner of embodiment 2 is simpler in structure and has fewer components than the tensioner of embodiment 1.

Example 3

Fig. 4, 5, 6, and 7 show the tensioner of embodiment 3 having only one adjustment location. In this embodiment, the same members as those in embodiment 1 shown in fig. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The embodiment shown in fig. 4, 6, 7 differs from embodiment 1 in that a moving mechanism is provided at only one of the 4 corner members. Respectively as follows: a moving mechanism is provided at the corner member 2 of fig. 4; a moving mechanism is provided at the corner member 3 of fig. 6; a moving mechanism is provided at the corner member 113 of fig. 7.

The moving mechanisms provided at the corner members 2, 3 of fig. 4, 6 are the same as those provided at the corner members 2, 3 of fig. 1.

The moving mechanism provided at the corner member 113 in fig. 7 is constituted by a link mechanism constituted by link pieces 114, 115, 120 and pins 116, 117, 118, 119, and constantly contacts the end portions of the links 11, 12 provided between the adjacent corner members 104, 105, and moves the links 11, 12 toward the adjacent corner members 104, 105.

If the insert 52a is moved in the direction of arrow 73 or 74 by the T-wrench 54, the guide rods 11, 12 will be moved in the direction of arrows 44 or 43, 45 or 46 by the above-described linkage mechanism.

The pressure generated by the advancement of the insert 52a in the direction of arrow 73 primarily serves to move the guide bar 12 in the direction of arrow 45 if the force required to move the guide bar 12 in the direction of arrow 45 is less than the force required to move the guide bar 11 in the direction of arrow 44 by inserting the T-wrench 54 into the insert 52a and rotating the insert 52a and advancing it in the direction of arrow 73. Thus, the guide bar 11 is moved in the direction of the arrow 43 by the link mechanism.

If the force required to move guide bar 12 in the direction of arrow 45 is equal to the force required to move guide bar 11 in the direction of arrow 44, the pressure generated by the advancement of insert 52a in the direction of arrow 73 is evenly distributed to move guide bar 11 in the direction of arrow 44 and guide bar 12 in the direction of arrow 45. As a result, the guide rods 11 and 12 receive the same magnitude of thrust and start to move in the directions of arrows 44 and 45, respectively.

On the other hand, inserting the T-wrench 54 into the insert 52a and rotating the insert 52a in the opposite direction to retract it in the direction of arrow 74, if the guide bar 11 is subjected to a greater force in the direction of the corner member 113 than the guide bar 12 is subjected to a greater force in the direction of the corner member 113, the guide bar 11 will move in the direction of arrow 43 as the insert 52a retracts in the direction of arrow 74.

If the force applied to the guide bar 11 toward the corner member 113 is equal to the force applied to the guide bar 12 toward the corner member 113, the guide bar 11 and the guide bar 12 will move equally in the directions of the arrows 43 and 46, respectively, as the insert 52a is retracted in the direction of the arrow 74.

The embodiment shown in fig. 4, 5, 6 and 7 is also different from embodiment 1 in that: each end of 2 guide rods extending to the corner member at the position opposite to the corner member provided with the moving mechanism is fixed to the corner member at the position opposite to the corner member.

In the embodiment shown in fig. 4, each end of 2 guide rods 11 and 12 extending toward the corner member 103 at the position facing the corner member 2 provided with the moving mechanism is fixed to the corner member 103. In the embodiment shown in fig. 4, the flanges 21, 26 are fitted into the recesses 103b, 103a, respectively, wherein the flanges 21, 26 are formed at the ends of the guide rods 11, 12; the recesses 103b and 103a are formed in the corner member 103, and the flange 21 at the end of the guide bar 11 is fitted into the recess 103b, and the flange 26 at the end of the guide bar 12 is fitted into the recess 103a, so that the respective ends of 2 guide bars 11 and 12 are fixed to the corner member 103.

The tensioner of the embodiment shown in fig. 4 is provided with the same transmission as the embodiment shown in fig. 1.

Compared with the tensioning device of the embodiment shown in fig. 1, the tensioning device of the embodiment shown in fig. 4 has simple structure and fewer components, thereby being beneficial to reducing the manufacturing cost.

The embodiment shown in fig. 6 differs from the embodiment shown in fig. 4 and 2 in the shape of the corner members 4, 5.

The corner members 104,105 of the embodiment of figure 6, which correspond to the corner members 4, 5 of the embodiment of figure 4, employ a connecting rod mechanism rather than the cam mechanism of figure 4.

In the link mechanism formed by connecting the pins 109, 110, 112, the connecting pieces 106, 107, 108, and the pin 111, the links 10, 13 and the connecting piece 107 are coupled by the pin 112; the guide rods 11 and 12 are connected with the connecting piece 106 through a pin 109; the connecting piece 108 is rotatably mounted to the corner member 105 by means of pins 110 provided protruding on the corner members 104, 105.

Thus, even if a link mechanism is employed at the corner members 104, 105 in the embodiment shown in fig. 6 corresponding to the corner members 4, 5 in the embodiment shown in fig. 4 instead of the cam mechanism in fig. 4, the tensioner of the present invention is provided with a transmission mechanism that performs the operations described in the embodiment shown in fig. 1.

For example, if guide bar 13 moves in the direction of arrow 48, guide bar 12 will move in the direction of arrow 46 under the action of a linkage mechanism provided at corner member 105. That is, the movement of one guide bar 13 of the 2 guide bars 13 and 12 extending toward the corner member 105 is converted into the movement of the other guide bar 12 away from the corner member 105.

In addition, if the guide bar 10 moves in the direction of arrow 42, the guide bar 11 moves in the direction of arrow 44 by the guide bar linkage mechanism provided to the corner member 104. That is, the movement of one guide 10 of the 2 guide rods 11 and 10 extending toward the corner member 104 in the direction away from the corner member 104 follows the movement of the other guide rod 11 toward the corner member 104.

Similarly, if guide bar 13 is moved in the direction of arrow 47, guide bar 12 will be moved in the direction of arrow 45 by the action of a linkage mechanism provided at corner member 105. That is, the movement of one guide bar 13 of the 2 guide bars 12, 13 extending toward the corner member 105 in the direction away from the corner member 105 follows the movement of the other guide bar 12 toward the corner member 105.

Further, if the guide bar 10 moves in the direction of the arrow 41, the guide bar 11 moves in the direction of the arrow 43 by the link mechanism provided in the corner member 104. That is, the movement of one guide bar 10 of the 2 guide bars 10, 11 extending toward the corner member 104 is converted into the movement of the other guide bar 11 away from the corner member 104.

The tensioner of the embodiment of fig. 6 may reduce the number of elastic members used as compared to the tensioner of the embodiment of fig. 4-2.

The embodiment shown in fig. 7 differs from the embodiments shown in fig. 1, 4, and 6 only in the form of the moving mechanism (as described above), and the other configurations are the same as those of the embodiment shown in fig. 6.

The embodiment of fig. 7 may reduce the number of elastic members used as compared to the embodiment of fig. 6.

Example 4

Embodiment 4 of the tensioner of the present invention is described with reference to fig. 8. In this embodiment, the same members as those in embodiment 1 shown in fig. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In this tensioner, a moving mechanism is provided for 1 corner member 303 out of 4 corner members, and the moving mechanism is held in contact with an end portion 12a of a guide rod 12 provided between the corner member 303 and one corner member 105 out of 2 adjacent corner members 104 and 105, and moves the guide rod 12 in the direction of an arrow 45 of the one corner member 105. The end of the guide bar 11 provided between the corner member 303 and the other corner member 104 of the 2 corner members 104 and 105 is fixedly connected to the corner member 303 provided with a moving mechanism.

In the corner member 303 provided with the moving mechanism, if the T-wrench 54 is inserted into the insert 81 and the insert 81 is rotated to advance in the direction of the arrow 79, the guide bar 12 provided between the corner member 303 and the corner member 105 moves in the direction of the arrow 45 toward the corner member 105. On the other hand, if the insert 81 is rotated backward to retract in the direction of arrow 80 after the T-wrench 54 is inserted into the insert 81, the guide bar 12 disposed between the corner member 303 and the corner member 105 moves in the direction of arrow 46 away from the corner member 105.

In the tensioning device of the embodiment shown in fig. 8, each corner member 105, 202, 104, except for the corner member 303 provided with the moving mechanism, is provided with the link mechanism provided with the corner member 104, 105 of the embodiment shown in fig. 6.

The tensioning device of the embodiment shown in fig. 8 is provided with a transmission mechanism which converts the movement of 1 of 2 guide rods extending towards the corner members 105, 202, 104 in the direction of the respective corner member 105, 202, 104 into the movement of the other 1 guide rod in the direction away from the respective corner member 105, 202, 104 and causes the movement of one of the 1 guide rods in the direction away from the respective corner member 105, 202, 104 to follow the movement of the other 1 guide rod in the direction towards the respective corner member 105, 202, 104.

The tensioner of the embodiment of figure 8 reduces the number of spring members used as compared to the tensioner of the embodiment of figure 1.

Example 5

A mechanism for tensioning a sheet-like material in a tensioning device will be described with reference to fig. 9, 10, 11, and 12.

In the embodiment shown in fig. 9 and 10, a protrusion 96 is provided on the upper side of each of the frame members 6, 7, 8, 9, and a notch 97 to be fitted into the protrusion 96 is formed around the sheet-like material 91 stretched on the stretching device.

As shown in fig. 10, if the frame members 6, 7, 8, 9 of the sheet-like material tensioning device are pressed in the directions of the arrows 510, 502 to press the ridge 96 into the groove 97, and the tensioning and tension adjusting actions in the directions of the arrows 505, 506 are performed (as shown in fig. 10(b), 11 (b)), the entire sheet-like material 91 can be tensioned with uniform tension.

In the embodiments of fig. 10(a), 10(b), 11(a), and 11(b), the upper ribs 96 of the frame members 6, 7, 8, and 9 are inclined in different directions, and accordingly, the positions of the hooks of the grooves 97 formed around the sheet-like material 91 are different, namely, the outer side in the embodiment of fig. 10(a) and 10(b), and the inner side in the embodiment of fig. 11(a) and 11 (b).

Fig. 13(a), (b) and fig. 14(a), (b) illustrate a case when the sheet-like material 91 is tensioned: the sheet-like material 91 is a metal sheet used in screen printing, and as shown in fig. 12 and 23, a projection 99 is provided on the periphery thereof, and a groove 98 for engaging the projection 99 is provided on the upper side of each of the frame members 6, 7, 8, and 9.

If the frame members 6, 7, 8, 9 of the sheet-like material tensioning device are pressed in the directions of the arrows 510, 502 to press the ribs 99 into the grooves 98 as described in embodiment 1, and the tensioning and tension adjusting actions are performed in the directions of the arrows 507, 508, 505, 506 (as shown in fig. 13(b) and 14 (b)), the sheet-like material 91 as a whole can be tensioned with a uniform tension.

In the embodiments of fig. 13(a), 13(b), 14(a), and 14(b), the upper grooves 98 of the frame members 6, 7, 8, and 9 are inclined in different directions, and accordingly, the positions of the hooks 99 formed around the sheet-like material 91 are different, namely, the outer side in the embodiment of fig. 13(a) and 13(b), and the inner side in the embodiment of fig. 14(a) and 14 (b).

Instead of providing the corner members 2, 3, 4, 5 with hooks for hooking the sheet-like material, the frame members 6, 7, 8, 9 may be provided with hooks.

Example 6

Still another embodiment 6 of the sheet-like material tensioning device of the present invention is described with reference to fig. 15 and 16. In this embodiment, the same members as those in embodiment 1 shown in fig. 1 are designated by the same reference numerals, and the description thereof will be omitted.

Example 6 differs from example 1 in that: the tensioner of this embodiment is provided with inner sheets 6a, 7a, 8a, 9a extending inward from the frame members 6, 7, 8, 9 of the sheet-like material tensioner 1, and the inner sheets 6a, 7a, 8a, 9a are provided with hooking protrusions 90.

The inner sheets 6a, 7a, 8a, and 9a (shown as 7a and 9a in fig. 16) extending inward from the frame members 6, 7, 8, and 9 of the sheet material stretching device 1 are attached to positions where the forming planes of the frame members 6, 7, 8, and 9 do not protrude, and at the positions, they are located inside the frame members 7 and 9 of the sheet material stretching device 1 and are inclined upward from a slightly lower position toward the inner side. The inner sheets 7a and 9a have engaging projections 90 formed at positions flush with the forming planes of the frame members 6, 7, 8, and 9.

As shown in fig. 16(a), the hooking protrusion 90 provided on the inner side sheet 7a or 9a is hooked on the hooking hole 92 of the sheet-like material 91, and pressed in the direction of the arrows 501 or 520 by the fitting device 94, and as shown in fig. 16(b), the tension in the direction of the arrows 503 or 504 is adjusted to tension the sheet-like material.

The inner sheets 7a and 9a are inclined upward toward the inside of the sheet material tensioning device 1 (as shown in fig. 16), and therefore the sheet material 91 is supported by the upper edges of the inner sheets 7a and 9a and tensioned in the horizontal direction. At this time, the upper end of the hooking protrusion 90 does not protrude from the plane of the sheet-like material 91 stretched in the horizontal state (as shown in fig. 16 (c)), and thus the formation surface of the sheet-like material at the time of printing is 1 plane.

Fig. 17, 18, 19, 20 and 21 show a metal sheet material tensioned in the tensioner 1 of example 6, and fig. 23 shows a metal sheet material.

The cut-out portions 510 are effective in preventing the folded portions of the four corners from overlapping each other when the metallic sheet material 91 is folded in the four sides, in which the four corners of the metallic sheet material 91 are each cut out to have a shape curved inward.

In the sheet material stretching device of the present invention, the protruding pieces 511 corresponding to the shapes of the cut-outs 501 are provided inside the 4 corner members 2, 3, 4, and 5, respectively.

The projecting piece 511 can effectively reduce the risk of injury to the hand of the operator when the sheet material 91 is stretched on the sheet material stretching device.

The tensioner of this embodiment is provided with inner sheets 6a, 7a, 8a, 9a extending inward from the frame members 6, 7, 8, 9 of the sheet-like material tensioner 1, and the inner sheets 6a, 7a, 8a, 9a are provided with hooking protrusions 90.

The projecting hooking protrusion 90 is provided in a straight line shape as shown in fig. 17 or in an arc shape convexly curved outward of the tensioner 1 as shown in fig. 20.

As shown in fig. 17, when the hooking protrusion 90 is linearly arranged at least at the outer edge thereof, it is preferable that the hooking holes 92 and 93 provided around the sheet-like material 91 are arranged at least at the outer edge thereof in an arc shape convexly curved toward the inside of the tensioner 1 (as shown in fig. 23 a).

That is, as shown in fig. 17, the hooking protrusion 90 is disposed so that a line in which at least the positions of the outer edges thereof are aligned is orthogonal to a vertical line from the center of the tension device of the sheet-like material to each of the frame members 6, 7, 8, 9.

On the other hand, as shown in fig. 23(a), the hooking holes 92 and 93 provided around the sheet-like material 91 have the outer edges of the hooking holes 93 located on the outer sides of the inner side sheets 6a, 7a, 8a and 9a located on the outer sides thereof and the outer edges of the hooking holes 92 located on the inner sides of the inner side sheets 6a, 7a, 8a and 9a located on the inner sides thereof. In this way, at least the positions of the outer edges of the hooking holes 92 and 93 are arranged in an arc shape convexly curved toward the inside of the tensioner 1.

Therefore, if the sheet-like material 91 shown in fig. 23(a) is temporarily tensioned in the tensioning device shown in fig. 17, the relationship between the protrusion 90 and the hooking holes 92 and 93 becomes as shown in fig. 18.

Here, if the tensioning and tension adjusting operation described in embodiment 1 is performed, the relationship between the hooking protrusion 90 and the hooking holes 92 and 93 becomes as shown in fig. 19, and the entire sheet-like material 91 is tensioned with a uniform tension.

In order to arrange at least the positions of the outer edges of the hooking holes 92, 93 provided in the periphery of the sheet-like material 91 in an arc shape convexly curved toward the inside of the tensioner 1, the hooking hole 93 disposed on the outside of the inner sheet 6a may be formed in an elliptical shape or an oval shape (as shown in fig. 23(a), (c)).

As shown in fig. 23(b), the engaging hole 93 disposed on the outer side of the inner sheet 6a may be formed in a circular shape having a larger radius than the engaging hole 92. It is also possible to provide a snowman shape in which a small radius circle is superimposed on a large radius circle, the small radius circle being directed toward the outer peripheral edge of the sheet-like material 91 (as shown in fig. 23 (d)).

Further, as shown in fig. 23(e), the sheet-like material may be formed into a tear-shaped thin portion, and the thin portion may be directed toward the outer peripheral edge of the sheet-like material 91.

If the hooking protrusion 90 is arranged in a circular arc shape convexly curved toward the outside of the tensioner 1 (as shown in fig. 20), the outer edge positions of the hooking holes 92, 93 provided around the sheet-like material 91 are preferably arranged in a straight line, and the inner edge positions thereof are preferably arranged in a circular arc shape convexly curved toward the outside of the tensioner 1 (as shown in fig. 24 (a)).

That is, the hooking protrusions 90 are arranged in an arc shape convexly curved toward the outside of the tensioner 1 (as shown in fig. 20).

On the other hand, as shown in fig. 24(a), the hooking holes 92, 93 provided on the periphery of the sheet-like material 91 have their outer edges positioned in a line orthogonal to a vertical line from the center of the tension device of the sheet-like material to each of the frame members 6, 7, 8, 9.

The inner edge of the hooking hole 93 located on the outer side of the inner side sheets 6a, 7a, 8a, and 9a is located further inward, and the outer edge of the hooking hole 92 located on the inner side of the inner side sheets 6a, 7a, 8a, and 9a is located further outward. In this way, at least the positions of the inner edges of the hook holes 92 and 93 are arranged in an arc shape convexly curved outward of the tensioner 1.

Therefore, if the sheet-like material 91 shown in fig. 24(a) is temporarily tensioned on the tensioning device shown in fig. 20, the relationship between the protrusion 90 and the hooking holes 92 and 93 becomes as shown in fig. 21.

Here, if the tensioning and tension adjusting operation described in embodiment 1 is performed, the relationship between the hooking protrusion 90 and the hooking holes 92 and 93 becomes as shown in fig. 19, and the entire sheet-like material 91 is tensioned with a uniform tension.

In order to arrange the hooking holes 92 and 93 provided around the sheet-like material 91 so that the outer edge positions thereof are linearly arranged and the inner edge positions thereof are arc-shaped so as to be convexly curved outward of the tensioner 1 as shown in fig. 24(a), the hooking holes 93 located outward of the inner sheet 6a may be formed in an elliptical shape or a circular shape (as shown in fig. 24(a) and (c)).

The hooking hole 93 located outside the inner sheet 6a may be formed in a circular shape having a larger radius than the hooking hole 92 (as shown in fig. 24 b). A snowman shape may be provided in which a small radius circle 93a is superimposed on a large radius circle 93b, the small radius circle 93a facing the outer peripheral edge of the sheet-like material 91 (as shown in fig. 24 (d)).

Further, the sheet-like material may be formed into a tear-shaped thin portion, and the thin portion may be directed toward the outer peripheral edge of the sheet-like material 91 (see fig. 23 (e)).

The inner side sheets 6a, 7a, 8a, 9a extend inward from the respective frame members 6, 7, 8, 9 of the sheet material stretching device 1, and are preferably provided so as to be inclined inward and upward of the sheet material stretching device 1, as described below.

When the sheet material tensioning device 1 is a sheet material such as a metal sheet or a net material and the sheet material is attached to the hooking holes 131 at the 4 frame corners of the frame (as shown in fig. 25), the sheet material can be prevented from being unnecessarily tensioned by providing the protrusions 130 for hooking the hooking holes on the upper sides of the corner members 2, 3, 4, 5.

Industrial applicability

The tension device for a sheet-like material of the present invention can be used as a tool for tensioning a sheet-like, net-like, plate-like, wire-like or the like material made of metal, resin, leather or the like.

For example, the following uses are provided.

The ink can be used as a tool for forming a printing plate for forming an image in a printing field such as screen printing and a tool for forming a canvas for painting. In these cases, the sheet material tensioning device of the present invention can easily attach and detach the tensioned sheet material, thereby saving space.

Can be used as a frame for tensioning a billboard display screen, a frame for a printed product display screen, a frame for a bezel, and a frame for a poster/flag. In these cases, the sheet material tensioning device of the present invention can easily attach and detach the tensioned sheet material, thereby saving space.

Can be used as a frame for tensioning sheet-like materials and photos for vacuum adhesion.

Can be used as a tool for tensioning display screens such as liquid crystal display screens, plasma display screens, EL display screens, screens for image projection, colored drawing glass, light-transmitting panels of lighting fixtures and the like.

Can be used as a tool for tensioning window frames, tents, windows, doors, screens, siding, ceilings, floors, partitions, and the like. These are uses related to construction and construction.

Can be used as a tool for tensioning tables, shelves, racks for drying articles, racks for placing articles, clapboards, curtains and the like. These are uses as furniture.

Can be used as a tool for tensioning a mattress and a seat part of a chair. In this case, the flexibility of the bed or chair can be adjusted by changing the tension at will.

Can be used as a tool for tensioning the specular body. The tension device for sheet-like materials of the present invention can tension a mirror-finished material to a desired tension value. In this case, the flatness can be kept good, and the size and weight can be flexibly adapted.

Can be used as a tool for tensioning the antenna.

In the field of sports, the tensioning device can achieve the tensioning purpose when tensioning strings of rackets or trampoline nets, and can also be used for tensioning rebound walls and clapboards of ball games.

Can be used as a tool for tensioning soundboards, horn cones and the like of percussion instruments, string instruments or keyboard instruments.

Can be used as a tool for tensioning the wings or propellers of an airplane. Can be used as a tool for tensioning propellers for wind power generation.

Can be used as a tool for tensioning net-like or mesh-like materials, such as fishing nets in aquaculture. In this case, it is possible to dry the article placed thereon after tensioning the net-like or mesh-like material, the linear or ribbon-like material. In addition, it can be used as a filter for cooking after the net-like or net-like member is tensioned.

In addition, the tension tool can be used as a tool for tensioning light plates for airplanes. By means of the tensioning device according to the invention, tension in all directions can be applied to the tensioned sheet-like material, so that tensioning of lightweight panels for aircraft is facilitated.

Further, the mechanism of the tensioner of the present invention can be applied to the field of mechanical devices such as fastening tools, detaching tools, and vices, or to the field of civil engineering and construction such as tunnel construction, revetment construction, and pit setting.

Claims (21)

1. A tension device for sheet-like materials, wherein,

the tension device of the sheet-like material is composed of the following parts:

4 corner members provided at four corner portions of the quadrangle and having 2 legs arranged in an L-shape;

4 hollow frame members, both ends of which are supported by the corner members and are respectively erected between the adjacent 2 corner members, and which are movable between the adjacent corner members in the direction of the adjacent corner members, and which are movable in the direction of approaching or separating from the opposite frame members together with the adjacent 2 corner members supporting both ends thereof;

4 guide rods respectively passing through the frame members and provided between the adjacent 2 corner members so as not to be separated from the corner members, and having flanges at both ends; and

an elastic body disposed between the flange and an outer edge of the corner member, for urging one end of the guide rod in a direction toward the corner member and urging the other end in a direction toward the corner member,

each frame component is provided with a hanging and buckling part for hanging and buckling the periphery of the sheet material or tensioning the frame body of the sheet material,

the 4 frame members are each movable between adjacent ones of the corner members in a direction toward the adjacent corner members and in a direction toward or away from the opposing frame member.

2. The tensioning device for sheet-like materials of claim 1,

a set of opposed corner members among the 4 corner members is provided with a moving mechanism which contacts an end portion of the guide rod disposed between the adjacent corner members and moves the guide rod in the direction of the adjacent corner member;

a transmission mechanism is provided which converts the movement of any 1 guide bar of 2 guide bars extending toward a corner member adjacent to a set of opposed corner members provided with the moving mechanism in the direction toward the adjacent corner member into the movement of the other 1 guide bar in the direction away from the adjacent corner member, and causes the movement of the other 1 guide bar in the direction toward the adjacent corner member to follow the movement of the any 1 guide bar in the direction away from the adjacent corner member.

3. The tensioning device for sheet-like materials of claim 1,

a moving mechanism which is always in contact with an end portion of the guide rod disposed between the adjacent corner members and moves the guide rod in a direction toward the adjacent corner member is provided to 1 corner member out of the 4 corner members;

each end of 2 guide rods extending on a corner member at a position opposed to the corner member provided with a moving mechanism is fixed to the corner member;

a transmission mechanism is provided which converts the movement of any 1 of 2 guide rods extending toward a corner member adjacent to the corner member provided with the moving mechanism in the direction toward the adjacent corner member into the movement of the other 1 guide rod in the direction away from the adjacent corner member, and causes the movement of the other 1 guide rod in the direction toward the adjacent corner member to follow the movement of the any 1 guide rod in the direction away from the adjacent corner member.

4. The tensioning device for sheet-like materials of claim 1,

a pair of the opposite corner members of the 4 corner members are respectively provided with a moving mechanism which contacts an end portion of the guide rod disposed between the adjacent corner members and moves the guide rod toward the adjacent corner members,

the end portions of the guide rods, which are respectively disposed between the pair of opposed corner members provided with the moving mechanism and the adjacent corner member, on the side extending toward the adjacent corner member are respectively fixed to the adjacent corner members.

5. The tensioning device for sheet-like materials of claim 1,

one of the 4 corner members is provided with a moving mechanism which contacts an end portion of the guide rod disposed between the one corner member and the adjacent 2 corner members, moves the guide rod toward the one corner member, and is fixedly connected between end portions of the guide rod disposed between the other corner member and the adjacent 2 corner members;

a transmission mechanism is provided for converting the movement of any one of 1 guide bar of 2 guide bars extending toward a corner member other than the corner member provided with the moving mechanism in the direction toward the corner member into the movement of the other 1 guide bar in the direction away from the corner member, and for causing the movement of the other 1 guide bar in the direction toward the corner member to follow the movement of the any one 1 guide bar in the direction away from the corner member.

6. The tensioning device of a sheet-like material as claimed in any one of claims 1, 2, 3, 4 and 5,

the moving mechanism is mounted to a corner portion of the corner member and provided with an insert movable in a direction connecting the corner portion and a center side of a quadrangle formed by the 4 corner members;

the top end of the insert is in contact with the end of each guide rod on the side close to the corner member provided with the moving mechanism.

7. The tensioning device of a sheet-like material as claimed in any one of claims 1, 2, 3, 4 and 5,

the moving mechanism is mounted to a corner portion of the corner member, and is provided with an insert and a ball which are movable in a direction connecting the corner portion and a center side of a quadrangle formed by the 4 corner members;

the ball is movably disposed in a space formed between an end portion of a guide rod disposed between the corner member provided with the moving mechanism and an adjacent corner member, the end portion being on a side close to the corner member provided with the moving mechanism, and a tip end of the insert;

the ball is installed between the tip of the insert and the end of each guide rod so as to be in contact with the tip of the insert and the end of each guide rod on the side close to the corner member provided with the moving mechanism.

8. The tensioning device of a sheet-like material as claimed in claim 6,

a stopper member that restricts an amount of movement of the insert toward a direction of a center side of a quadrangle formed by the 4 corner members is provided in the corner member provided with the movement mechanism.

9. The tensioning device for sheet-like materials of claim 7, wherein,

a stopper member that restricts an amount of movement of the insert toward a direction of a center side of a quadrangle formed by the 4 corner members is provided in the corner member provided with the movement mechanism.

10. The tensioning device of a sheet-like material as claimed in any one of claims 1, 2, 3, 4 and 5,

each frame component is internally provided with a hollow part;

and 4 guide rods respectively passing through the frame members and provided between the adjacent 2 corner members, wherein the support bodies provided at predetermined intervals in the hollow portions of the frame members support the adjacent 2 corner members in the hollow portions.

11. The tensioning device of a sheet-like material as claimed in any one of claims 1, 2, 3, 4 and 5,

the position of the hanging buckle part does not protrude out of the surface formed by the frame component;

the hooking protrusion formed on the frame member does not protrude from the surface on which the frame member is formed.

12. A tension device for sheet-like materials, wherein,

the tension device of the sheet-like material is composed of the following parts:

4 corner members provided at four corner portions of the quadrangle and having 2 legs arranged in an L-shape;

4 hollow frame members, both ends of which are supported by the corner members and are respectively erected between the adjacent 2 corner members, and which are movable between the adjacent corner members in the direction of the adjacent corner members, and which are movable in the direction of approaching or separating from the opposite frame members together with the adjacent 2 corner members supporting both ends thereof;

4 guide rods respectively passing through the frame members and provided between the adjacent 2 corner members so as not to be separated from the corner members, and having flanges at both ends; and

an elastic body disposed between the flange and an outer edge of the corner member, for urging one end of the guide rod in a direction toward the corner member and urging the other end in a direction toward the corner member,

each corner member is provided with a hanging part for hanging and buckling the end part of the sheet material or the end part of the frame body tensioning the sheet material,

the 4 frame members are each movable between adjacent ones of the corner members in a direction toward the adjacent corner members and in a direction toward or away from the opposing frame member.

13. The tensioning device for sheet-like materials of claim 12, wherein,

a pair of opposed corner members of the 4 corner members are provided with a moving mechanism which contacts an end portion of the guide rod disposed between the adjacent corner members and moves the guide rod in the direction of the adjacent corner member;

a transmission mechanism is provided which converts the movement of any 1 guide bar of 2 guide bars extending toward a corner member adjacent to a set of opposed corner members provided with the moving mechanism in the direction toward the adjacent corner member into the movement of the other 1 guide bar in the direction away from the adjacent corner member, and causes the movement of the other 1 guide bar in the direction toward the adjacent corner member to follow the movement of the any 1 guide bar in the direction away from the adjacent corner member.

14. The tensioning device for sheet-like materials of claim 12, wherein,

a moving mechanism which is always in contact with an end portion of the guide rod disposed between the adjacent corner members and moves the guide rod in a direction toward the adjacent corner member is provided to 1 corner member out of the 4 corner members;

each end of 2 guide rods extending on a corner member at a position opposed to the corner member provided with a moving mechanism is fixed to the corner member;

a transmission mechanism is provided which converts the movement of any 1 of 2 guide bars extending toward a corner member adjacent to the corner member provided with the moving mechanism in the direction toward the adjacent corner member into the movement of the other 1 guide bar in the direction away from the adjacent corner member, and causes the movement of the other 1 guide bar in the direction toward the adjacent corner member to follow the movement of the any 1 guide bar in the direction away from the adjacent corner member.

15. The tensioning device for sheet-like materials of claim 12, wherein,

a pair of the opposite corner members of the 4 corner members are respectively provided with a moving mechanism which is in contact with an end portion of the guide rod arranged between the adjacent corner members and moves the guide rod toward the adjacent corner members;

the end portions of the guide rods, which are respectively disposed between the pair of opposed corner members provided with the moving mechanism and the adjacent corner member, on the side extending toward the adjacent corner member are respectively fixed to the adjacent corner members.

16. The tensioning device for sheet-like materials of claim 12, wherein,

one of the 4 corner members is provided with a moving mechanism which contacts an end portion of the guide rod disposed between the one corner member and the adjacent 2 corner members, moves the guide rod toward the one corner member, and is fixedly connected between end portions of the guide rod disposed between the other corner member and the adjacent 2 corner members;

a transmission mechanism is provided for converting the movement of any one of 1 guide bar of 2 guide bars extending toward a corner member other than the corner member provided with the moving mechanism in the direction toward the corner member into the movement of the other 1 guide bar in the direction away from the corner member, and for causing the movement of the other 1 guide bar in the direction toward the corner member to follow the movement of the any one 1 guide bar in the direction away from the corner member.

17. The tensioning device for sheet-like materials according to any one of claims 12, 13, 14, 15 and 16, wherein,

the moving mechanism is mounted to a corner portion of the corner member and provided with an insert movable in a direction connecting the corner portion and a center side of a quadrangle formed by the 4 corner members;

the top end of the insert is in contact with the end of each guide rod on the side close to the corner member provided with the moving mechanism.

18. The tensioning device for sheet-like materials according to any one of claims 12, 13, 14, 15 and 16, wherein,

the moving mechanism is mounted to a corner portion of the corner member, and is provided with an insert and a ball which are movable in a direction connecting the corner portion and a center side of a quadrangle formed by the 4 corner members;

the ball is movably disposed in a space formed between an end portion of a guide rod disposed between the corner member provided with the moving mechanism and an adjacent corner member, the end portion being on a side close to the corner member provided with the moving mechanism, and a tip end of the insert;

the ball is installed between the tip of the insert and the end of each guide rod so as to be in contact with the tip of the insert and the end of each guide rod on the side close to the corner member provided with the moving mechanism.

19. The tensioning device for sheet-like materials of claim 17,

a stopper member that restricts an amount of movement of the insert in a direction toward a center side of a quadrangle formed by the 4 corner members is disposed in the corner member provided with the movement mechanism.

20. The tensioning device for sheet-like materials of claim 18,

a stopper member that restricts an amount of movement of the insert in a direction toward a center side of a quadrangle formed by the 4 corner members is disposed in the corner member provided with the movement mechanism.

21. The tensioning device for sheet-like materials according to any one of claims 12, 13, 14, 15 and 16, wherein,

each frame component is internally provided with a hollow part;

and 4 guide rods respectively passing through the frame members and provided between the adjacent 2 corner members, wherein the support bodies provided at predetermined intervals in the hollow portions of the frame members support the adjacent 2 corner members in the hollow portions.