JP7407884B2 - Frame and screen version - Google Patents

Description

The present invention relates to a gauze tensioning device for producing a screen plate used for screen printing by applying tension to the gauze and attaching it to a frame, and in particular, it is capable of uniformly tensioning the gauze on the frame with high tension. This invention relates to a gauze stretching device with a simple structure, a frame body, and a screen plate.

Patent Document 1 discloses an invention of a gauze stretching device that stretches gauze around a frame with a necessary tension to produce a screen plate. According to this invention, the frame body 4 placed on the lifting table 141 is distorted by the air cylinder 603, and the lifting table 141 is raised from the underside of the gauze which is stretched and held under a predetermined tension to distort the frame 4. A screen plate can be produced by pressing the frame 4 against the gauze and performing a pasting operation, and then lowering the lifting table 141 to release the distorted shape of the frame 4.

Patent Document 2 discloses an invention of a tension-adjustable gauze stretching frame that can easily and stably hold the peripheral edge of gauze. In the gauze tensioning frame of the present invention, the gauze can be tensioned by pulling the edge holder 2, which holds the peripheral edge of the gauze within the groove of the main body frame 1, toward the outer circumferential side with the bolt 5.

Patent Document 3 discloses an invention of a gauze stretching machine that can easily obtain reliable and stable clamping force and uniform tension. The gauze stretching machine of the present invention includes two orthogonal axes, a formwork mounting table on which the formwork is placed, and a clamp bar on the axes that supports the edge of the gauze. By fitting the fixing bar into the slit provided in the clamp bar, the four edges of the gauze can be supported, and the clamp bar can be moved outward on the axis to apply tension to the gauze. .

Japanese Unexamined Patent Publication No. 62-99148 Japanese Patent Application Publication No. 8-20100 Japanese Patent Application Publication No. 2008-302497

The invention of the gauze tensioning device disclosed in Patent Document 1 has the problem that the entire device is enlarged, so the installation location is limited, and the cost is also high. In addition, in the inventions of the gauze stretching frame and gauze stretching machine as shown in Patent Document 2 and Patent Document 3, it requires skill to set the tension acting on the gauze to be equal in two directions orthogonal to each other, so it is necessary to set the gauze tension appropriately. There is a problem in that it is difficult to apply gauze under such conditions. Furthermore, since it is difficult to stretch these gauze frames and the like strongly due to their structure, there is also the problem that it is difficult to stretch the gauze with a strong tension of 20 N or more, for example.

The present invention has been made in view of such conventional techniques and their problems, and provides a gauze stretching device with a simple structure that can stretch gauze on a frame with high and uniform tension, a frame and The purpose is to provide a screen version.

The frame according to claim 1 includes:
A screen plate frame body on which the gauze of a screen master made of a thermoplastic resin film and gauze is attached to the attachment surface with an adhesive,
A low friction material having a predetermined thickness and a friction coefficient of 0.25 or less is provided on the outer periphery of the attachment surface, and a gap is formed between the adhesive and the screen master.

When gauze is applied using the frame described in claim 1, a low-friction sheet is placed on the pasting surface of the frame so that the screen master pushed up by the frame can move over the pasting surface. It can reduce resistance when moving. Furthermore, this low-friction sheet improves sliding on the edge of the frame and reduces resistance. Therefore, the screen master is less likely to be torn, and can be stretched and fixed to the frame with the necessary tension.

It is a perspective view of the gauze tensioning device of a 1st embodiment. FIG. 3 is a perspective view showing the structure and function of a mounting frame provided in the gauze tensioning device of the first embodiment. It is a perspective view of the frame support part and jack provided in the gauze tensioning device of 1st Embodiment. It is a perspective view which shows the frame support part and the drive part of the jack separately in the gauze tensioning apparatus of 1st Embodiment. It is a perspective view which saw through and represented the joint device of the frame support part and the drive part of a jack in the gauze tensioning apparatus of 1st Embodiment. It is a perspective view showing the state where a screen master is placed on the gauze tensioning device of a 1st embodiment. It is a perspective view showing a state where a screen master is held in a mounting frame of a gauze tensioning device of a 1st embodiment. It is a perspective view showing the state where the screen master attached to the gauze tensioning device of a 1st embodiment is pushed up with a jack, and tension is applied. It is a typical sectional view showing the state where tension was given to a screen master by a frame in a gauze tensioning device of a 1st embodiment. It is a perspective view which shows the process of heating the peripheral part of the screen master to which the tension|tensile_strength was given in the gauze tensioning apparatus of 1st Embodiment, and welding it to a frame. It is a typical sectional view showing a modification of the frame used for the gauze tensioning device of a 1st embodiment. FIG. 3 is a perspective view expressed in a line diagram including the content of FIG. 2 showing the structure and function of the attachment frame provided in the gauze tensioning device of the first embodiment. It is a perspective view of the gauze tensioning device of a 2nd embodiment. It is a perspective view which shows the state which opened the upper frame of an attachment frame in the gauze tensioning apparatus of 2nd Embodiment. FIG. 7 is an enlarged perspective view showing the lower frame of the attachment frame and a part of the roller of the frame support section in the gauze tensioning device of the second embodiment with the upper frame of the attachment frame opened. It is a perspective view which shows the state which opened the upper frame of an attachment frame in the gauze tensioning apparatus of 2nd Embodiment, and mounted the frame on the frame support part. FIG. 7 is a perspective view showing a state in which the upper frame of the attachment frame is opened and the screen master is placed on the lower frame in the gauze stretching apparatus of the second embodiment. It is a perspective view which shows the state where the screen master is inserted|pinched and locked between the upper frame and the lower frame of an attachment frame in the gauze tensioning apparatus of 2nd Embodiment. It is a perspective view which shows the state where the screen master attached to the attachment frame was pushed up by the frame support part in the gauze tensioning apparatus of 2nd Embodiment, and the tension|tensile_strength was applied. It is a perspective view seen from the front side showing a state in which the screen master is pushed up by the frame support part and tension is applied in the gauze tensioning device of a second embodiment. FIG. 7 is a cross-sectional view showing the positional relationship between the screen master attached to the attachment frame and the frame support portion and frame at a standby position before being raised in the gauze tensioning device of the second embodiment. FIG. 7 is a cross-sectional view showing a state in which the screen master is pushed up by the frame support part and tension is applied in the gauze tensioning device of the second embodiment. FIG. 7 is a partially enlarged cross-sectional view of the gauze tensioning device of the second embodiment in a state where the screen master is pushed up by the frame support section and tension is applied. FIG. 7 is a plan view illustrating a first example of the size, number, and posture of frames arranged below the screen master when gauze is applied to a frame using the gauze tensioning device of the second embodiment. FIG. 7 is a plan view showing a second example of the size, number, and posture of the frame bodies arranged below the screen master in gauze-stretching the frame bodies using the gauze-stretching device of the second embodiment. FIG. 7 is a plan view showing a third example of the size, number, and posture of the frames arranged below the screen master in gauze-stretching the frames using the gauze-stretching device of the second embodiment. It is a top view of the gauze tensioning device of the modification of 2nd Embodiment. FIG. 7 is a partially enlarged cross-sectional view of the gauze tensioning device according to a modification of the second embodiment in which the screen master is pushed up by the frame support section and tension is applied. In the gauze tensioning device of the modified example of the second embodiment, after the screen master is pushed up by the frame support part and tension is applied, the frame is raised by the moving means and the UV adhesive is brought into close contact with the screen master. It is an enlarged sectional view. It is a perspective view which shows the state which opened the upper frame of an attachment frame in the gauze tensioning apparatus of 3rd Embodiment, and mounted the frame on the frame support part. It is a perspective view which shows the state in which the fixing means is rotated toward the attachment frame which inserted the screen master in the gauze tensioning apparatus of 3rd Embodiment. FIG. 3 is an enlarged sectional view of the gauze tensioning device of the third embodiment taken along a cut plane orthogonal to the support shaft, with the fixing means in the open position and the fixing means immediately in front of the engagement position with respect to the mounting frame being shown in the figure. FIG. It is a perspective view which shows the fixing means just before the engagement position with respect to an attachment frame in the gauze tensioning apparatus of 3rd Embodiment. It is a perspective view which shows the fixing means in the engagement position with respect to an attachment frame in the gauze tensioning apparatus of 3rd Embodiment. It is a perspective view which shows the state where the screen master attached to the attachment frame is pushed up by the frame body support part, and the tension|tensile_strength is applied in the gauze tensioning apparatus of 3rd Embodiment. It is a process diagram which shows the manufacturing procedure of the frame suitably used for the gauze tensioning apparatus of each embodiment. It is a perspective view of the frame used suitably for the gauze tensioning device of each embodiment. 35 is a sectional view taken along the line AA in FIG. 34. FIG. It is a figure which shows the other example of the frame suitably used for the gauze tensioning apparatus of each embodiment, Comprising: Part (a) is a sectional view of the same frame, and part (b) is a cross-sectional view of the frame. FIG. 3 is a cross-sectional view showing the frame body disassembled for peeling.

The gauze stretching apparatus of each embodiment described below is an apparatus for producing a screen plate used for screen printing by applying tension to gauze and attaching it to a frame. "Gas", which is the constituent material of the screen plate, generally refers to a mesh made of metal such as stainless steel or resin such as polyester, but here we also introduce Screen Master, which is made of gauze with a thermoplastic resin film attached. shall be included. When a mesh is stretched over a frame, an emulsion is applied to the mesh and an image is formed on it to form a plate, but when a screen master is stretched over a frame, the screen master's thermoplastic resin An image is formed on a film and used as a plate. In the first and second embodiments described below, the main example is a case where the screen master is stretched over a frame.

1. Configuration of the gauze tensioning device 1 of the first embodiment (FIGS. 1 to 5, FIG. 12)
The configuration of this gauze tensioning device 1 will be explained with reference to FIGS. 1 to 5.
As shown in FIG. 1, the gauze tensioning device 1 of the first embodiment has a main body that is a highly rigid frame 2 in which each side of a rectangular parallelepiped is made of a square tubular structural member. Although aluminum can be used as the structural material, it is not limited to this. Casters (leg wheels) 3 are attached to the four corners of the bottom frame 2a of the frame 2, and the entire device 1 can be moved and rotated in any direction with a relatively small force. A stopper 4 is provided on the caster 3, and the device 1 can be fixed at any position and in any direction. As described later, the power source of this gauze tensioning device 1 is a manual hydraulic jack, so it is not connected to external equipment with air piping or cables, so it can be freely handled and moved within a narrow work space. , can perform screen plate production work.

As shown in FIG. 1, mounting frames 5 are provided on the four sides of the top of the frame 2 to apply tension to and hold the gauze. As shown in FIG. 2, each mounting frame 5 has a groove 6 continuous in the lateral direction. The groove 6 has a structure in which the inside is enlarged vertically with respect to the central opening. The corner portions within the groove 6 are smoothly curved to prevent damage to the screen master held within the groove 6 by a guide portion 7, which will be described later.

As shown in FIGS. 2(a) and 2(b), the guide member 7 member is inserted into the groove 6 with the edge of the screen master 8 sandwiched therebetween. The guide portion 7 includes an insertion portion 7a having the same shape as the groove 6 of the mounting frame 5, and a flange portion 7b provided on the insertion portion 7a to close the opening of the groove 6.
Note that FIG. 12(a) is a perspective view showing the mounting frame 5 with the screen master 8 pushed into the groove 6 and the guide portion 7 in outline or line drawings, and FIGS. 12(b) and (c) 2(a) and 2(b) are shown as outline or line diagrams without gray representation.

As shown in FIG. 1, a reinforcing base 9 is incorporated in the lower half of the frame 2, and a jack 10 is mounted on the base 9. This jack 10 is a means for applying tension to the screen master 8, and is a hydraulic pantograph jack. As shown in FIG. 3, the jack 10 includes a hydraulic unit 11, a lever 12 for operating the hydraulic unit 11, a pantograph-shaped drive unit 13 that is raised by hydraulic pressure, and these parts are attached and fixed to the base 9. A substrate 14 is provided. The jack 10 used in this gauze tensioning device 1 may be any type of jack other than a pantograph jack, but if you want the tension applied to the screen master 8 to be as large as possible, for example 20 N or more, the maximum working load is about 2 tons. It is preferable to employ a jack 10 of.

As shown in FIGS. 3 to 5, a frame support portion 16 is attached to a plate portion 15 at the upper end of the drive portion 13 of the jack 10 via a joint device 20, which will be described later. The frame support part 16 is a member on which a frame 17 of the screen plate is placed. As shown in FIG. 1, the frame support part 16 is a rectangular frame that is one size smaller than the bottom frame 2a of the frame 2 (see FIG. 1) or the mounting frame 5 assembled in a rectangular shape at the top of the frame 2, The center portions of the two pairs of opposite sides are connected by a reinforcing member 18. As shown in FIG. 1, the frame body support part 16 is arranged slightly below the mounting frame 5 provided at the top of the frame 2, and the frame body 17 is placed on the frame body support part 16. In this case, the frame 17 faces the lower surface (porous support side) of the screen master 8 stretched over the mounting frame 5 of the frame 2.

As shown in FIGS. 3 to 5, the plate portion 15 of the drive portion 13 of the jack 10 and the lower surface of the frame support portion 16 are connected by a coupling device 20. As shown in FIGS. This coupling device 20 includes a receiving plate 21a having a recess 22a attached to the plate portion 15 of the jack 10, a receiving plate 21b having a recess 22b attached to the lower surface of the frame support 16, and two receiving plates 21a. , 21b, and a steel ball 28 rotatably fitted into each of the recesses 22a, 22b of the recesses 22a, 22b. The joint device 20 is provided at the center of gravity of the frame support portion 16 and supports the frame support portion 16 . In this way, since the frame support part 16 is supported by the joint device 20, the frame body 17 can contact the screen master 8 as evenly as possible when lifted by the jack 10. .

As shown in the enlarged perspective view of FIG. 5, round holes 23 are formed in each of the four corners of the two receiving plates 21a, 21b, and the opposing round holes 23, 23 of the two receiving plates 21a, 21b are provided with round holes 23. , a cylindrical rod 24 having a slightly smaller outer diameter than the round hole 23 is inserted. Therefore, the frame support part 16 cannot rotate in the horizontal plane because the cylindrical rod 24 stops rotating with respect to the plate part 15 of the drive part 13 of the jack 10, but the gap between the cylindrical rod 24 and the round hole 23 It is possible to swing about the steel ball 28 in the depth direction of each round hole.

2. Effects of the gauze tensioning device 1 of the first embodiment (FIGS. 6 to 10, FIG. 12)
The operation of stretching the screen master 8 on the frame 17 using the gauze stretching device 1 described above will be described with reference to FIGS. 2 and 6 to 10. The following is an example of the specifications of the screen version to be produced. The size of the frame 17 is 650 mm x 910 mm, the screen master 8 is 200 mesh (density of 200 fibers per inch), and the material of the mesh is not limited. It is assumed that the screen master 8 is stretched on the frame 17 with a tension of 20N.

As shown in FIG. 6, the frame 17 is placed on the frame support 16 of the gauze tensioning device 1. Of the two surfaces of the frame body 17, one surface to which the screen master 8 is pasted is referred to as a pasting surface 25. In FIG. 6 , the upper surface of the frame 17 placed on the frame support 16 is the attachment surface 25 . Adhesive is applied to the attachment surface 25 of the frame 17 in advance. As the adhesive, a chloroprene rubber solvent adhesive such as the product name "Konishi Bond G17Z", a hot melt adhesive, or an acrylic adhesive can be used. These adhesives are diluted with a solvent, applied to the attachment surface 25, and left to dry. The frame 17 is placed on the frame support 16 with the adhesive-applied surface 25 facing upward.

As shown in FIG. 6, the screen master 8 is placed on the mounting frame 5 of the gauze stretching device 1 with the thermoplastic resin film facing up and the porous support facing down. The screen master 8 is a rectangle whose four edges are all larger than the mounting frame 5, and the screen master 8 is arranged so that the length of each edge beyond the mounting frame 5 becomes an allowance for stretching the screen master 8.

As shown in FIGS. 2(a) and 12(a), insert the edge of the screen master 8 into the groove 6 of the mounting frame 5, and then insert the guide part 7 into the groove 6 as shown in FIG. 12(b). Insert and fix the edges as shown in FIGS. 2(b) and 12(c). In the example shown in FIG. 2, for convenience of illustration, the guide part 7 material is shorter than the mounting frame 5, but in reality, the length of the mounting frame 5 and the guide part 7 material are the same as shown in FIG. , it is preferable that approximately the entire length of each edge of the screen master 8 is fixed. By fixing the four edges of the screen master 8 in this manner, the screen master 8 can be stretched above the frame support 16 with a tension that does not cause wrinkles, as shown in FIG.

As shown in FIG. 8, the lever 12 of the jack 10 is operated to raise the drive section 13, and the frame 17 placed on the frame support section 16 is moved to the lower surface side (porous support side) of the screen master 8. Press. The screen master 8 is pushed up by the frame 17, and a larger tension is applied thereto. In addition, in FIG. 8, in order to more clearly show the state in which the frame 17 pushes up the screen master 8, the frame support part 16 is omitted from illustration.

As shown in FIG. 9, when the jack 10 is operated to gradually push up the screen master 8 using the frame 17, the screen master 8 slides on the attachment surface 25 of the frame 17, stretches due to tension, and gradually move outside. The goal of this operation is to push up the screen master 8 with the frame 17 to obtain the necessary tension within a range where the angle between the surface of the screen master 8 outside the frame 17 and the perpendicular L is 45 degrees or more. . If this angle is less than 45 degrees, there is a high possibility that the screen master 8 will be cut due to rubbing against the edge of the frame 17. Assuming that the size of the frame 17 and the number of meshes of the screen master 8 are as in the above example, if the jack 10 is used within the maximum working load of 2 tons to push it up to the state shown in FIG. The tension of the screen master 8 can be set to about 20N as described above. Note that the work of applying tension to the screen master 8 is performed as follows. A worker operates the jack 10 to gradually push up the screen master 8, and measures the tension of the screen master 8 with a tension gauge at any time to obtain the target tension.

As previously explained with reference to FIG. 5 etc., the frame support part 16 on which the frame body 17 is mounted is prevented from rotating at any position in the circumferential direction around the steel ball 28 of the joint device 20. It can swing vertically within the range allowed by the gap between the round hole 23 and the cylindrical rod 24. Further, due to the rotation prevention action of the round hole 23 and the cylindrical rod 24, the frame support portion 16 and the frame 17 are able to move in a substantially horizontal plane around the steel ball 28 while the frame 17 is pushing up the screen master 8. The position will not shift in the direction of rotation. Furthermore, since the jack 10 that pushes up the frame 17 is installed on a reinforcing base 9 fixed to the lower half of the robust frame 2, the drive section 13 of the jack 10 is positioned directly above the initial position. It only moves in the direction, and does not wobble left or right.

Therefore, according to this gauze stretching device 1, the frame 17 hits the screen master 8 uniformly. That is, the attachment surface 25 of the frame 17 is in uniform contact with the screen master 8 at any position, and a uniform tension is generated on the screen master 8. Furthermore, there is little risk that the corner or edge of the frame 17 will partially hit the screen master 8 and cut the screen master 8.

As shown in FIGS. 8 and 9, when the screen master 8 is stretched to the frame 17 with the desired tension, the fixing work is performed as shown in FIG. 10. Note that, similarly to FIG. 8, illustration of the frame support portion 16 is omitted in FIG. 10 as well. A worker (not shown) presses the hot iron 26 against the screen master 8 on the pasting surface 25 of the frame 17, moves the hot iron 26 along the circumferential direction of the frame 17, and moves the hot iron 26 around the entire circumference of the screen master 8. heat up. The heating temperature by the hot iron 26 is about 230 degrees. Due to this heating, the thermoplastic resin film of the screen master 8 melts, and the adhesive of the frame 17 melts and enters between the fibers of the gauze.As the adhesive cools and solidifies, the screen master 8 is attached to the frame 17. is glued to.

As mentioned above, in the first embodiment, the tension of the screen master 8 is set to be about 20N, but even if the tension measured with a tension gauge is 20N when the adhesive is heated and melted and fixed, When actually used as a screen plate for printing, the tension may drop, so if the target is 20N, it is better to actually tension it with a tension slightly higher than this.

After the fixation by heating is completed in the state shown in FIG. 10, the screen master 8 is cut along the frame 17 with a knife at a position between the frame 17 and the mounting frame 5, and the completed screen plate is cut into the frame support 16. Take it out.

As explained above, according to the gauze tensioning device 1 of the first embodiment, the screen master 8 can be stretched evenly and with high tension on the frame 17. Specifically, the tension in the Y direction perpendicular to the tension in the X direction of the screen master 8, which is evenly stretched at 20 N or more, can be kept within 3 to 5%.

In addition, in the initial state where the screen master 8 is stretched and fixed on the frame 17, by tensioning the screen master 8 with a tension that exceeds the elastic limit depending on the type of the screen master 8, the screen master 8 may elongate due to changes over time. It becomes difficult to do.

Furthermore, the time required to uniformly adjust the tension of the screen master 8 can be significantly shortened. That is, the complicated adjustment procedure in the conventional technology described in the background art section is eliminated, and problems such as damage to the adjustment mechanism are also eliminated. There is no need to acquire advanced adjustment techniques.

In addition, since the operating mechanism is only in the vertical direction using the jack 10, space is saved. Since a manual hydraulic jack is used as the jack 10, high uniform tension can be obtained with a simple structure and without consuming power. Note that automation is also possible if an electric jack is used.

3. Modified example (Figure 11)
Next, a modification of the first embodiment will be described with reference to FIG. 11.
In the first embodiment described with reference to FIGS. 1 to 10, since the screen master 8 is used, the adhesive is applied to the attachment surface 25 of the frame 17 in advance as described above. If the gauze is to be stretched on the frame 17, the adhesive is applied from the gauze side after the gauze is stretched on the frame 17, and the adhesive is applied between the pasting surface 25 and the gauze. However, even if the adhesive is supplied from the screen master 8 side after the screen master 8 is stretched on the frame 17, the adhesive cannot be applied to the attachment surface 25 because there is a thermoplastic resin film. This is because it cannot be applied.

When attaching the screen master 8 to the frame 17 whose attachment surface 25 is coated with adhesive as in the first embodiment, the screen master 8 is pushed up by the frame 17 as described above. It is necessary to repeat the operation of sliding it on the attachment surface 25 and moving it out of the frame 17 to apply tension. However, according to this method, the following problems may occur depending on the case.

In other words, depending on the size of the frame 17, the number and material of the gauze, the type and application state of the adhesive, the load applied by the jack 10, etc. The problem is that the screen master 8 becomes difficult to slide against the agent, and the pressed screen master 8 becomes difficult to move smoothly out of the frame 17, making it difficult to gradually increase the tension applied to the screen master 8. . Furthermore, as a result of the worsened slippage, there was also a problem that the screen master 8 could rub against the edge of the frame 17 and be torn. To solve this problem, each time you lift the frame 17 little by little with the jack 10, touch the screen master 8 near the frame 17 with your finger from the opposite side of the attachment surface 25 (underside of the frame 17). This can be corrected by performing a correction operation of pushing the frame body 17 to the outside of the frame body 17.

However, in this modification, when the screen master 8 is stretched on the frame 17 using the gauze tensioning device 1 of the first embodiment, the pushed-up screen master 8 easily slides on the pasting surface 25 of the frame 17. In this way, it is an object of the present invention to make it possible to apply a necessary high tension to the screen master 8 simply by operating the jack 10 without performing the above-mentioned correction operation with fingers.

As shown in FIG. 11, in this modification, the adhesive 27 is applied to the required area of the attachment surface 25 of the frame 17, and a low-friction material is applied to the attachment surface 25 and the outer periphery of the adhesive 27. It is characterized in that a low friction sheet 30 is attached. The adhesive 27 may be applied to the entire surface of the attachment surface 25, which is one side of the frame 17, but in the example shown in FIG. 11, it is applied to a portion of the attachment surface 25. The low-friction sheet 30 covers the outer periphery of the attachment surface 25 all around the rectangular frame 17, and also covers the edge of the frame 17 and bends downward, and also covers the upper side of the frame 17. There is. As the low friction sheet 30, a tape coated with polytetrafluoroethylene, which is a type of fluororesin, or a craft tape can be used. Here, the term kraft tape refers to a tape made of kraft paper coated with insoluble glue on one side and laminated with synthetic resin on the other side. Note that, regardless of the material, it is preferable that the coefficient of friction of the low-friction sheet 30 is 0.25 or less, and the thickness of the low-friction sheet 30 is 50 μm or more.

As shown in FIG. 11, by stretching the low-friction sheet 30 over the outer periphery of the adhesive 27 provided on the attachment surface 25 of the frame 17, the height of the low-friction sheet 30 is adjusted to that of the screen master 8 and the adhesive. A gap 35 (the position is indicated by a broken line ellipse in FIG. 11) is created between the surface 27 and the surface 27. This gap 35 can reduce the resistance when the screen master 8 pushed up by the frame 17 moves on the attachment surface 25.

Moreover, according to this low-friction sheet 30, the sliding at the edge of the frame 17 is improved, and the resistance is reduced. For this reason, the screen master 8 is less likely to be torn, and can be stretched and crimped onto the frame 17 with the necessary tension. In addition, the gauze tensioning device 1 can be made smaller and lighter, and the user's operability can be improved.

4. Configuration of the gauze tensioning device of the second embodiment (FIGS. 13 to 15, FIGS. 20 to 23)
The configuration of this gauze tensioning device will be explained with reference to FIGS. 13 to 15 and 20 to 23.
The gauze tensioning device 100 of the second embodiment has some parts in common in configuration with the gauze tensioning device 1 of the first embodiment, but there are also differences. In the following description, parts that are different in configuration from the gauze tensioning device 1 of the first embodiment will be mainly explained, and descriptions of parts that have the same structure as the gauze tensioning device 1 of the first embodiment will be omitted or omitted as appropriate. The explanation of the configuration and operation of the first embodiment will be simplified and the same reference numerals as those of the gauze tensioning device 1 of the first embodiment will be used in the drawings as much as possible.

As shown in FIG. 13, the gauze tensioning device 100 of the second embodiment has a main body that is a highly rigid frame 2 in which each side of a rectangular parallelepiped is made of a square tubular structural member. Although aluminum can be used as the structural material, it is not limited thereto. The gauze tensioning device 100 of the second embodiment does not have casters (leg wheels) 3 attached to the bottom frame 2a of the frame 2, and is used by being installed at a predetermined position. As with the gauze tensioning device 1 of the first embodiment, casters 3 may be provided to make it movable.

As shown in FIG. 13, a mounting frame 101 is provided at the top of the frame 2 to apply tension to and hold the gauze. As shown in FIGS. 13 and 14, the attachment frame 101 is composed of an upper frame 101a and a lower frame 101b having substantially the same shape.

As shown in FIG. 14, the lower frame 101b is a rectangular frame that constitutes the upper part of the frame 2. As shown in FIG. One end of each of the pair of short sides of the lower frame 101b protrudes toward one long side, and two small rectangular attachment parts 102b including the protruding parts protrude outward from the outer shape of the frame 2. It is composed of As shown in FIG. 13, the upper frame 101a is a rectangular frame for sandwiching the screen master between it and the lower frame 101b. Similar to the lower frame 101b, one end of each of the pair of short sides of the upper frame 101a protrudes toward one of the long sides, and two small rectangular attachment parts 102a including the protruding portions correspond to the outer shape of the frame 2. It is configured to protrude outward.

As shown in FIG. 14, the two attachment parts 102b of the lower frame 101b and the two corresponding attachment parts 102a of the upper frame 101a are rotatably connected by hinges 103, respectively. The rotation axis of the hinge 103 is parallel to the long sides of the lower frame 101b and the upper frame 101a, and the upper frame 101a can rotate around the rotation axis of the hinge 103 with its short side as a radius. Further, as shown in FIG. 14, the upper frame 101a can be fixed in the open position, for example, by rotating upward by a predetermined acute angle from the horizontal position, and the upper frame 101a is fixed in the open position. Then, the screen master 8 is placed on the lower frame 101b.

As shown in FIG. 15, fixing members 105 are provided on the upper surface of each side of the lower frame 101b. As understood from FIG. 14, fixing members 105 are provided on the lower surface of each side of the upper frame 101a, similarly to the upper surface of each side of the lower frame 101b shown in FIG. This fixing member 105 is made of an elastic member such as rubber having a high coefficient of friction.

As shown in FIG. 15, the fixing member 105 is an elongated member as a whole, and as can be seen from the end face perpendicular to the longitudinal direction, the fixing member 105 has a base 106 enlarged at the bottom and a cap-like opening provided on the base 106. The contact portion 107 has a substantially circumferential shape. Two mounting grooves 108 are formed parallel to each other along the longitudinal direction on the upper surface of each side of the lower frame 101b. By inserting and fixing the base portion 106 of the fixing member 105 into the mounting groove 108, two contact portions 107 are arranged at a predetermined interval on the upper surface of each side of the lower frame 101b. The fixing structure of the fixing member 105 to the upper frame 101a is also similar. When the upper frame 101a is stacked on the lower frame 101b, the contact portions 107 of the respective fixing members 105 contact each other, so there is a distance of several mm between the lower surface of the upper frame 101a and the upper surface of the lower frame 101b. A gap of some extent will occur. Further, a plurality of grooves 109 parallel to the longitudinal direction are provided on the upper surface of the contact portion 107 of the fixing member 105 to prevent the screen master 8 sandwiched between the upper frame 101a and the lower frame 101b from slipping. .

As shown in FIG. 13, the lower frame 101b and the upper frame 101a can be fixed in a closed state by a fixing means 130. Further, as shown in FIG. 14, by releasing the fixing means 130, the upper frame 101a can be rotated upward to open the upper surface of the lower frame 101b. As shown in FIG. 14, the fixing means 130 is located at positions corresponding to two locking tools 131 provided on the long sides of the lower frame 101b and two locking tools 131 provided on the long sides of the upper frame 101a. It has two locked tools 131 provided therein. As shown in FIG. 16, the locking tool 131 includes a handle 133 that can be rotated up and down about a fulcrum, and an annular member 134 that is connected to the handle 133 and moves up and down in accordance with the operation of the handle 133. have. The locked tool 132 is a hook to which the annular member 134 is locked.

As shown in FIG. 14, the upper frame 101a in the open state is lowered onto the lower frame 101b, and the handle 133 is operated upward to move the annular member 134 upward, and the locked tool 132 of the upper frame 101a is moved upward. Hang the annular member 134. Then, the handle 133 is operated downward to move the annular member 134 downward, and the position of the handle 133 is locked. As shown in FIG. 13, the upper frame 101a is fixed in a drawn state toward the lower frame 101b. Note that the configuration of the fixing means 130 is an example, and as long as it is configured to fix the stacked upper frame 101a and lower frame 101b and further fix them in close contact with each other in the direction of attracting them, it is necessary to limit the configuration to the above-mentioned configuration. There isn't.

How to handle the screen master in the gauze tensioning device 100 of this embodiment will be described in detail later, but before closing and fixing the upper frame 101a, insert the screen master 8 between the upper frame 101a and the lower frame 101b. If this is done, the fixing members 105 of the upper frame 101a and the lower frame 101b will be pressed against each other with the screen master 8 in between, and will be in a crushed state, so together with the action of the groove 109 provided in the fixing member 105, The screen master 8 is securely fixed between the upper frame 101a and the lower frame 101b under tension. Its fixing action is superior to that of the gauze tensioning device 1 of the first embodiment. Therefore, even if a considerable amount of tension is applied to the screen master 8 in order to stretch the screen master 8 to the frame 17 in the process of tensioning the frame 17, which will be described later, the screen does not come out from between the upper frame 101a and the lower frame 101b. Master 8 will not fall out, and Screen Master 8 will not easily tear. As a result, the screen master 8 can be stretched on the frame 17 with a tension exceeding that of the first embodiment (for example, 25 N).

As shown in FIGS. 13 and 20, a reinforcing base 9 is incorporated in the lower half of the frame 2, and a jack 110 is mounted on the base 9. This jack 110 is a means for applying tension to the screen master 8 stretched between the upper frame 101a and the lower frame 101b, and is an electric pantograph jack. As shown in FIG. 20, the jack 110 includes a telescopic pantograph-shaped drive part 113, an electric motor 111, a screw 112 that is driven by the electric motor 111 to extend and retract the drive part 113, and these parts are attached. A substrate 14 fixed to the base 9 is provided. According to the electric jack 110, the tension applied to the screen master 8 can be adjusted easily and quickly. In particular, if the tension is too strong, you can quickly make adjustments to loosen it a little.

As shown in FIGS. 13 and 20, a frame support section 115 is attached to the upper end of the drive section 113 of the jack 110 via a joint device 20 having the same configuration as the first embodiment. The frame support part 115 is a member on which the frame 17 of the screen plate is placed. As shown in FIG. 13, the frame support 115 is a rectangular frame that is one size smaller than the lower frame 101b provided at the top of the frame 2, and the center portions of two pairs of opposite sides are connected by a reinforcing member 18. ing. As shown in FIG. 13, the frame support portion 115 is arranged at a standby position slightly below the lower frame 101b provided at the top of the frame 2. As shown in FIG. When the frame 17 is placed on the frame support 115 in the standby position and the screen master 8 is stretched between the upper frame 101a and the lower frame 101b, the lower surface of the screen master 8 (of the porous support) side) and the upper surface of the frame 17 face each other with a small interval therebetween.

As shown in FIG. 15, which is a partially enlarged view of FIG. 14, rollers 118 are rotatably provided along the four sides of the frame support 115 so as to be parallel to each side. . The roller 118 is a guide member that slidably contacts the screen master 8 and guides the movement of the screen master 8. The roller 118 is made of a low friction material, for example, a fluororesin such as PTFE or PFA.

FIG. 21 is a vertical cross-sectional view of the screen master 8 stretched between the upper frame 101a and the lower frame 101b, and the frame support part 115 in the standby position on which the frame 17 is placed. As shown in FIG. 21, bearings 117 are attached to the outer surface of each side of the frame support 115 via adapters 116. As shown in FIG. The bearing portion 117 is a member that rotatably supports the roller (guide member) 118, and is made of resin, metal, or the like. The bearing portion 117 is configured separately from the adapter 116 so as to have the required shape, structure, and dimensions, and only this portion can be manufactured using a 3D printer. The adapter 116 is made of resin, metal, or the like. The adapter 116, the bearing part 117, and the roller 118 constitute a guide part, and when the screen master 8 is stretched, a gap is formed between the master 8 and the upper surface of the frame 17, and the master 8 can be slid. To support.

As shown in a further enlarged view in FIG. 23, the bearing portion 117 protrudes above the upper surface of the frame support portion 115, and a support groove 140 for receiving the roller 118 is provided on the upper surface. The support groove 140 is a cylindrical cavity that matches the outer diameter of the roller 118, but an uneven support structure 141 is formed on its inner peripheral surface to minimize the contact area with the roller 118. . An adhesive 27 is applied to the upper surface of the frame 17 placed on the frame support 115 , and the top of the roller 118 rotatably fitted into the support groove 140 is attached to the frame support 115 . It is located above the upper surface of the adhesive 27 of the frame 17 placed on the frame body 17.

As shown in FIGS. 22 and 23, when the frame support 115 is raised from the standby position by the jack 110, the rollers 118 on the four sides of the frame support 115 hit the screen master 8 and push it up, giving it tension. However, the frame 17 does not touch the screen master 8, and a predetermined distance is maintained between the frame 17 and the screen master 8. Therefore, when tension is applied to the screen master 8, no frictional force is generated between the screen master 8 and the frame 17.

5. Effects of the gauze tensioning device 100 of the second embodiment (FIGS. 13 to 23)
The operation of stretching the screen master 8 on the frame 17 using the gauze stretching device 100 of the second embodiment described above will be described with reference to FIGS. 13 to 23. The specifications of the screen master 8 and the frame 17 used are generally the same as those described in the first embodiment, but the screen master 8 is attached to the frame 17 with a tension greater than that of the first embodiment (for example, a tension exceeding 25 N). It can be stretched to

The gauze tensioning device 100 of the second embodiment has some parts in common in configuration with the gauze tensioning device 1 of the first embodiment, but also has different parts. The description will focus on the parts that have different functions from the gauze tensioning device 1 of the present invention, and for the same functions as those in the first embodiment, the descriptions will be omitted or simplified as necessary and the description of the functions in the first embodiment will be used. shall be taken as a thing.

In FIG. 13, the screen master 8 and the frame 17 are not set, the upper frame 101a and the lower frame 101b are in a closed state, and both frames are locked by the fixing means 130.

As shown in FIG. 14, the lock by the fixing means 130 is released, the upper frame 101a is rotated upward, and the upper frame 101a is fixed in the open position where the upper frame 101a is rotated upward by a predetermined acute angle from the horizontal position. , perform the operations described below in this open position.

As shown in FIGS. 15 and 16, the frame 17 is placed on the frame support 115. The structure of the frame 17 is similar to that of the first embodiment.

As shown in FIG. 17, the screen master 8 is placed on the lower frame 101b, covering the frame support part 115 and the frame 17 (not shown). Although not shown, the screen master 8 is generally in the form of a long strip wound into a roll, and is often used by unrolling the required length from the roll. A screen master 8 of the required width is rolled out from the roll by the length necessary to cover the four sides of the lower frame 101b, placed on the lower frame 101b, and cut to form a sheet-like screen master as shown in FIG. 17. Get 8. Of course, a sheet-like screen master 8 of a required size may be used.

As shown in FIG. 18, the upper frame 101a is rotated downward and placed on the lower frame 101b with the screen master 8 in between, and the fixing means 130 locks the upper frame 101a and the lower frame 101b.

As shown in FIGS. 19, 20, and 22, the motor 111 of the jack 110 is driven to raise the drive section 113, and the frame support section 115 is moved to the lower surface side (porous support side) of the screen master 8. bring into contact. At this time, the rollers 118 on the four sides of the frame support part 115 uniformly hit the screen master 8, similar to the action described in the first embodiment with reference to FIG. 5 and the like. That is, the four rollers 118 uniformly contact the screen master 8 at any position. Then, the frame support portion 115 is further pushed up, and the screen master 8 is pushed up. In particular, as shown in FIG. 22, the screen master 8 is pushed by the rollers 118 of the frame support 115 and moves upward, and also smoothly moves outward and expands due to the rotation of the rollers 118.

In this way, in the second embodiment, it is the roller 118 of the frame support section 115 that comes into contact with the screen master 8 to apply tension, and when applying tension to the screen master 8, the action of the joint device 20 As a result, all the rollers 118 hit the screen master 8 uniformly, and the rollers 118 rotate in conjunction with the elongation of the screen master 8, so the frictional force generated between the screen master 8 and the rollers 118 is very small. Furthermore, since there is a gap between the screen master 8 and the frame 17, the screen master 8 does not come into contact with the attachment surface 25 of the frame 17.

Therefore, the screen master 8 is stretched over the frame 17 at a very small distance, and at this time, necessary and sufficient tension is uniformly applied to the screen master 8. The tension does not become weak in the center of the screen master 8, and the screen master 8 does not break due to excessive tension acting on the contact position with the roller 118. Note that the gap between the screen master 8 and the frame 17 when it is stretched is necessary to avoid friction with the frame 17, but in consideration of the subsequent adhesion process, it is better to make it as narrow as possible. Since it is difficult to precisely set the thickness of the adhesive (omitted in FIGS. 21 and 22) applied to the attachment surface 25 of the frame 17, the lower limit of the gap is about 50 to 100 μm. Further, if the tension of the screen master 8 is set to be about 20 N or more, for example, the return force after pasting becomes large, so taking this into account, it is better to make the gap as narrow as possible, and the upper limit is about 3 mm.

In addition, according to this gauze tensioning device 100, since the jack 110 is electric, the tension applied to the screen master 8 can be easily and quickly adjusted. In particular, if the tension is too strong, you can quickly make subtle adjustments such as loosening it a little.

As shown in FIGS. 19 and 20, once the state in which the screen master 8 is stretched with the necessary tension above the frame 17 at a small distance is obtained, referring to FIG. 10 in the first embodiment, Carry out the fixing work as described. That is, the worker presses the hot iron 26 against the screen master 8 on the pasting surface 25 of the frame 17, moves the hot iron 26 along the circumferential direction of the frame 17, and presses the hot iron 26 around the entire circumference of the screen master 8. heat up. The screen master 8 is bonded to the frame 17 as the adhesive cools and solidifies. In addition, when using UV adhesive as the adhesive, apply the UV adhesive to the attachment surface 25 of the frame 17 in advance to a predetermined thickness, and attach the screen with a predetermined tension applied to the screen master 8. The UV light is applied from above the master 8 to the pasting surface 25, and the UV light is irradiated while moving around the entire circumference of the screen master 8. As a result, the UV adhesive is cured and the screen master 8 is fixed to the frame 17.

According to the gauze tensioning device 100 of the second embodiment, since the frame 17 and the screen master 8 do not come into contact with each other, a plurality of frames 17 can be simultaneously set on the frame support 115 according to the size of the frame 17. However, gauze can be applied to a plurality of frames 17 in one process. For example, as shown in FIG. 24, when gauging a relatively large frame 17a, one sheet is placed on the frame support 115. Furthermore, as shown in FIG. 25, when gauging is applied to a relatively small frame 17b that is about half the size of the frame 17a in FIG. Can be used to make gauze. Furthermore, as shown in FIG. 26, since the screen master 8 does not come into contact with the edges of the frame 17, gauze can be stretched on a bias by arranging the frame 17a at an angle with respect to the frame support 115. becomes. Note that in FIGS. 24 to 26, rollers 118 and bearings 117 provided on four sides of the frame support 115 are shown instead of the main body of the frame support 115.
In addition, in the first and second embodiments described above, the driving part of the jack and the frame support part are connected using the joint device 20, but even if the joint device is not used, the frame support part can be It is sufficient if it can swing at an angle (for example, within 5 degrees in the horizontal direction) with the vicinity of the center of gravity of the frame support part as a fulcrum. In commonly used hydraulic jacks and electric jacks with a maximum specified load of about 2 tons, the drive section can swing slightly (at a minute angle) relative to the jack body. In such a jack, even if the driving part is fixedly connected to the frame support part, the frame support part can swing at a small angle using the vicinity of the center of gravity of the frame support part as a fulcrum. Therefore, when using such a jack, the driving part of the jack may be fixed to the frame support part.
In addition, in the second embodiment described above, the height of the roller 118 is constant, but when using a frame with a different thickness, etc., the adapter 116 is replaced with one with a different height, and the bearing part 117 is fixed. can be fixed to. In addition, the bearing part 117 is composed of a plurality of metal parts that fit together slidably, and has a structure that allows these metal parts to be screwed and fixed at any position, and the height of the top of the roller 118 is adjusted according to the thickness of the frame. may be adjustable. In this case, it is sufficient that the relationship between the height of the top of the roller 118 and the upper surface of the adhesive 27 can be maintained as shown in FIG.

6. Modifications of the second embodiment (FIGS. 27 to 29)
In the second embodiment, a roller 118 is provided as a guide member to eliminate friction between the adhesive 27 applied in advance and the screen master 8. Therefore, as shown in FIG. 23, when gauze is applied, the adhesive 27 and screen master 8 do not come into contact with each other, and no friction occurs. I was able to do tension.

When using a UV adhesive in the second embodiment, as described above, the UV adhesive is applied to the attachment surface 25 of the frame 17 in advance to a predetermined thickness, and the gap between the UV adhesive and the frame 17 is filled. A method in which a predetermined tension is applied to the screen master 8 in a state where the screen master 8 is held, and a UV light is applied from above the screen master 8, and the screen master 8 is moved around the entire circumference while being pressed against the pasting surface 25 while irradiating the UV light. will be adopted. According to this method, the UV adhesive is cured and the screen master 8 can be fixed to the frame 17.

However, in the second embodiment, when fixing the screen master 8 to the frame 17 using UV adhesive, the inventor of the present application has noticed that there may be some problems that need to be solved depending on the case. reached. When using UV adhesive, if the screen master and the adhesive layer are not in sufficiently stable contact, the screen master 8 cannot be fixed by solidifying the UV adhesive with UV irradiation. The problem is that there is a possibility that it will be sufficient. That is, in the method of using the UV adhesive in the second embodiment described above, a UV light is applied from above the stretched screen master 8, and the screen master 8 is pressed against the pasting surface 25 while being irradiated with UV light. Since the UV adhesive was moved around the entire circumference, there is a possibility that the contact between the UV adhesive and the attachment surface 25 will be insufficient, and the contact may also be uneven depending on the position of the circumferential attachment surface 25. As a result, there may be a problem in that it may be difficult to fix the screen master 8 all around the frame 17 with uniform and sufficient adhesive force. Further, even if such problems are excluded, if the gap between the screen master 8 and the frame body 17 is large, the adhesive layer must be thickened, which increases the amount of adhesive used and increases costs. Conceivable. In order to securely fix the screen master 8 to the frame 17 using UV adhesive, UV irradiation is performed while the screen master 8 is in close contact with the UV adhesive applied to the attachment surface 25 of the frame 17. However, in this case, the purpose of the gauze tensioning device 100 of the second embodiment, which is to create a gap between the adhesive and the screen master 8 during gauze tensioning and perform gauze tensioning at high tension without causing friction, is achieved. become unable.

Therefore, the inventors further improved the second embodiment. In other words, it is possible to create a gap between the adhesive and the screen master 8 during gauze gauging, and to perform gauze gauze with high tension without causing friction. We propose a gauze tensioning device 100a which is a modification of the second embodiment and can be securely fixed to the gauze tensioning device 100a.

The configuration of a gauze tensioning device 100a, which is a modification of the second embodiment, will be described with reference to FIGS. 27 to 29.
The gauze tensioning device 100a of the modified example of the second embodiment is obtained by adding new components to the gauze tensioning device 100 of the second embodiment, and the other configurations are the same as the gauze tensioning device 100 of the second embodiment. It is. Therefore, in the following explanation, the problem found by the inventor of the present invention in the gauze tensioning device 100 of the second embodiment and the new component that is a solution to the problem will be mainly explained, and the structure is common to the second embodiment. The explanation of the structure and operation of the second embodiment will be used by omitting or simplifying the explanation as appropriate for the parts, and the drawings will be given the same reference numerals as the gauze tensioning device 100 of the second embodiment as much as possible. .

As shown by broken lines in FIG. 27, moving means 160 are provided at the four corners of a rectangular frame support portion 115 (not shown) that supports the frame 17 in the gauze tensioning device 100a. As shown in FIGS. 28 and 29, the moving means 160 is fixed to a mounting hole 150 formed in the upper surface of the corner of the frame support 115 by any structure or means such as fitting or screwing. ing. The moving means 160 includes a main body part 161 fixed to the attachment hole 150 and a pressing part 162 provided so as to be freely retractable from the main body part 161. Inside the main body portion 161, there are provided a biasing means such as a spring that biases the pressing portion 162 upward, and a latch mechanism that releasably fixes the position of the pressing portion 162 with a single touch. When the pressing part 162 is pushed down against the urging force of the urging means, the pressing part 162 is retracted into the main body part 161, and when it exceeds a certain position, the latch mechanism works and the pressing part 162 is restrained from moving, as shown in FIG. It is set to the lower position shown at 28. From this state, if a pressing force is applied to the pressing part 162 and it is further pushed down and pushed into the main body part 161, the latch mechanism is released, and when the pressing force is released, the pressing part 162 is raised by the biasing means to a predetermined upper position. is set to Note that the force that this moving means 160 applies to the frame 17 is within the range of 10N to 200N.

The operation of the gauze tensioning device 100a, which is a modification of the second embodiment, will be explained with reference to FIGS. 27 to 29.
With the frame support part 115 in the standby position, the pressing parts 162 of the four moving means 160 are all set to the lower position, and the frame 17 is placed thereon. When the pressing parts 162 of the four moving means 160 are all set at the upper position, the frame 17 is placed on top of the pressing parts 162, and the central parts of the pair of long sides of the frame 17 (or the pair of short sides (center portions of each side) is pushed down, and the pressing portions 162 of the four moving means 160 are set to the lower position. UV adhesive 27a is applied to the attachment surface 25 of the frame 17.

The frame support part 115 is raised from the standby position by the jack 110. The rollers 118 on the four sides of the frame support 115 hit the screen master 8 and push it up, giving it the necessary tension. As shown in FIG. 28, the frame 17 does not come into contact with the screen master 8, and a predetermined distance is maintained between the UV adhesive 27a of the frame 17 and the screen master 8. Therefore, when the tension applied to the screen master 8 is increased to a predetermined value, no frictional force is generated between the screen master 8 and the frame 17, and the UV adhesive 27a is pressed to the outside of the frame 17. Or it will not protrude inward and flow.

As shown in FIG. 28, when a predetermined tension is applied to the screen master 8 and there is a predetermined gap between the screen master 8 and the frame 17 (and the UV adhesive 27a), a pair of frames 17 Simultaneously press down the center portions of each long side (or the center portions of a pair of short sides). The latch mechanisms of the four moving means 160 are released, and the frame 17 is pushed up by the four pressing parts 162 and rises, and as shown in FIG. (bottom side).

In the state shown in FIG. 29, UV light is irradiated from the film (top side) of the screen master 8 to harden the UV adhesive 27a, and the screen master 8 is attached to the frame 17 under a predetermined tension. It is adhered and fixed to the attachment surface 25. The UV adhesive 27a of the frame 17 is in close contact with the screen master 8 on its entire surface to which the necessary tension has been applied, and the state of the close contact is uniform due to the biasing force of the four moving means 160. Then, UV irradiation can be stably performed for the necessary time around the entire circumference of the frame 17.

The distance that the frame 17 is raised by the moving means 160 is such that the distance between the screen master 8, which is under the necessary tension, and the upper surface of the UV adhesive 27a is eliminated, and the UV adhesive 27a is in the state necessary for bonding. Any material that comes into contact with the bottom surface of the screen master 8 may be used. In the example shown in FIG. 29, considering the thickness of the UV adhesive 27a and the weight of the frame 17, the frame 17 is moved upward to a height where the surface of the UV adhesive 27a substantially matches the top of the roller 118. A moving means 160 having such a lifting force is adopted. However, depending on the amount (thickness) of the UV adhesive 27a applied to the attachment surface 25 of the frame 17, the surface of the frame 17 may be Further tension may be applied to the screen master 8 by raising the frame 17 until it substantially coincides with the apex, or by moving it upward to a height slightly above this. In this case, it is preferable to prevent the pressed UV adhesive 27a from flowing out to the outside of the frame 17. Further, the lower position of the pressing portion 162 of the moving means 160 is such that the UV adhesive 27a applied to the attachment surface 25 of the frame 17 does not come into contact with the lower surface of the screen master 8.

According to this modification, when gauze is applied using the UV adhesive 27a, the UV adhesive 27a can be uniformly and stably adhered to the entire circumference of the frame 17. Further, since the UV adhesive 27a is cured by UV irradiation, there is little variation due to differences in the skill of the operator. Furthermore, when using hot melt adhesive etc., it takes about 5 hours to apply and dry the adhesive, but with UV adhesive 27a, there is no need for drying and it only takes about 5 minutes. Improves work efficiency. In this way, by using the UV adhesive 27a, the screen master 8 and the frame 17 can be bonded to each other reliably and easily without the need for skilled techniques in gauze binding. Furthermore, if the UV adhesive 27a is used, there will be no damage to the screen master 8 due to heat or the like, so that the plate-making quality can be stabilized.

In this modification, the method of use in which the screen master 8 and the frame 17 are fixed with the UV adhesive 27a applied to the frame 17 in advance has been explained, but it is also possible to use the method without applying adhesive to the frame 17 in advance. This modification can be applied. That is, in the gauze tensioning device 100a of this modification, after the screen master 8 is stretched with a predetermined tension at a distance above the frame 17, the screen master 8 is heated along the pasting surface 25 with a hot iron. to melt the film and create holes for the adhesive to pass through. Thereafter, the pressing part 162 of the moving means 160 is raised to raise the frame 17, and the attachment surface 25 of the frame 17, which is not coated with adhesive, is brought into contact with the lower surface of the screen master 8. Then, adhesive is applied from the top side of the screen master 8 to bond the screen master 8 and the frame 17 together. In this way, according to the gauze tensioning device 100a of the present modification, the frame body 17 can be finally raised by a minute distance using the moving means 160, so that there is no need to take the trouble of applying adhesive to the frame body 17 in advance. It is possible to take a simple step of applying the necessary tension to the screen master 8, and finally bringing it into contact with the frame 17 and bonding it with an adhesive. Such a simple process cannot be realized unless this modification is provided with a moving means 160 that finally raises the frame 17 by a minute distance.

7. Gauze tensioning device 300 of the third embodiment (FIGS. 30 to 35)
A gauze tensioning device 300 according to the third embodiment will be described with reference to FIGS. 30 to 35.
First, the configuration of the gauze tensioning device 300 of the third embodiment will be explained. The gauze tensioning device 300 of the third embodiment shares the basic configuration with the gauze tensioning device 100 of the second embodiment, but differs in the configuration of the fixing means 330 for fixing the upper frame 101a and the lower frame 101b, etc. ing. In the following explanation, the structure and effects of the fixing means 330 and the like, which are different in configuration from the gauze tensioning device 100 of the second embodiment, will be mainly explained, and parts common to the gauze tensioning device 100 of the second embodiment will be described as appropriate. The explanation of the second embodiment will be used with the explanation omitted or simplified, and the drawings will be given the same reference numerals as those of the gauze tensioning device 100 of the second embodiment as much as possible.

As shown in FIGS. 30 and 35, this gauze tensioning device 300 has two fixing means 330 on each of the four sides of the lower frame 101b. Therefore, the total number of fixing means 330 is eight. As shown in FIGS. 31 and 32, guide grooves 290 are formed along the longitudinal direction on the lower outer surface and lower inner surface of the lower frame 101b, respectively. A slide portion 310 of a fixing means 330 is movably engaged with the guide groove 290 . The slide portion 310 has two box-shaped supports 312 each having two pairs of engagement claws 311 that engage with the guide groove 290 as main bodies. The two supports 312, 312 are arranged with a predetermined gap 313 in between, are penetrated by a support shaft 314, and are fixed together. Therefore, the support shaft 314 is exposed in the gap 313 between the two supports 312, 312.

As shown in FIG. 31, a fixing part 320 of a fixing means 330 is provided in the gap 313 at the center of the slide part 310. The fixing part 320 includes a mounting part 322 having a long hole 321 through which the support shaft 314 passes, a handle 323 continuous to the mounting part 322 at one end, and an operating body 324 integrally provided at the other end of the handle 323. These are arranged in a substantially C-shape as a whole, and have the function of fixing the upper frame 101a and the lower frame 101b. A hole 325 for operation is formed in the handle 323, and when the operator inserts a finger into the hole 325 and operates it, the fixed part 320 can be rotated up and down about the support shaft 314 of the slide part 310. Can be done. Further, as shown in FIG. 32, the operating body 324 is provided with a screw 326. The upper end of this screw 326 is an operation hole (not shown) into which a tool such as a wrench can be inserted and fixed, and the operation hole is visible from a screw hole 327 (see FIG. 31) opened on the top surface of the operation section 324. Therefore, by inserting a tool into the operation hole through this screw hole 327 and rotating the tool, the screw 326 can be moved forward or backward. As shown in FIG. 32, the lower end of this screw 326 penetrates the lower surface of the operating body 324 and protrudes downward, and a seat 328 with a flat lower surface is rotatable at the lower end with a ball joint (not shown). is connected to. Therefore, by arranging the fixing part 320 of the fixing means 330 above the upper surface of the upper frame 101a and advancing it downward by operating the screw 326 with a tool, the seat part 328 can be brought into stable contact with the upper surface of the upper frame 101a. , the load by the screws 326 can be stably applied in a direction perpendicular to the upper surface of the upper frame 101a.

Next, in the gauze tensioning device 300 of the third embodiment, the operation when stretching the screen master 8 on the attachment frame 101 will be explained.
As shown in FIG. 30, the upper frame 101a is rotated upward by a predetermined angle from the horizontal position and fixed in the open position, and the work described below is performed in this open position.

As shown in FIG. 30, the frame 17 is placed on the frame support 115. Next, although not shown in FIG. 27, the screen master 8 is placed on the lower frame 101b, covering the frame support portion 115 and the frame 17.

As shown in FIG. 31, the upper frame 101a is rotated downward and placed on the screen master 8. The screen master 8 is sandwiched between the upper frame 101a and the lower frame 101b, and the edges of the screen master 8 protrude outward from between the upper frame 101a and the lower frame 101b on the four sides of the upper frame 101a and the lower frame 101b. The state will be as follows.

In FIG. 32, when the fixing means 330 is open and the mounting frame 101 is not fixed, the fixing part 320 hangs downward under its own weight as shown in the lower part of FIG. 32. In this state, the position of the fixing means 330 with respect to the lower frame 101b is adjusted. That is, since the sliding part 310 of the fixing means 330 is engaged with the guide groove 290 of the lower frame 101b by its engaging claw 311, the operator can hold the sliding part 310 and move it in a direction parallel to the side of the lower frame 101b. The fixing means 330 can be moved by applying a force (a force in a direction perpendicular to the plane of the paper in FIG. 32). In order to prevent the screen master 8 from slipping out from between the upper frame 101a and the lower frame 101b when the screen master 8 is pushed up by the frame 17 in a later process, a fixing means 330 is set near a position where it can easily come off. It is preferable to keep it. Generally, if the screen master 8 stretched on a rectangular mounting frame 101 is pushed up by the frame 17 in such a manner that each side of the mounting frame 101 and each side of the rectangular frame 17 are parallel to each other, , it is considered that a large force tends to concentrate on the portions of the screen master 8 near the corners of the mounting frame 101. Therefore, it is conceivable to install the fixing means 330 at the corners of each side of the mounting frame 101, but if the fixing means 330 is placed too close to the corners, the force applied to the master will become too large and there is a risk that the master will be damaged. It's coming. Therefore, considering the master strength, it is preferable to arrange the fixing means 330 at a position slightly away from the corner of the mounting frame 101, as shown in FIG .

As shown in FIG. 31, the handle 323 is operated upward by placing a finger (the operator's finger is not shown) in the hole 325 of the handle 323, and the operating body 324 is moved upward in FIG. 32 and as shown in FIG. Pull up the fixing part 320 so that it is at the highest position.

As shown in FIGS. 33 to 34, the fixing means 330 is pushed toward the mounting frame 101 along the horizontal direction. The fixing means 330 moves along the support shaft 314 engaged with the elongated hole 321, and the operating body 324 is set at a position directly above the upper frame 101a. At this time, the edge of the screen master 8 protruding from between the upper frame 101a and the lower frame 101b is pressed by the handle 323 and becomes crushed and bent. In this state, the connecting portion of the torque wrench 329 is inserted through the screw hole 327 of the operating body 324 and coupled to the screw 326. The torque wrench 329 is operated to rotate the screw 326, the screw 326 is advanced toward the upper frame 101a, and the seat 328 of the screw 326 is pressed against the upper surface of the upper frame 101a.

As understood from FIGS. 34 and 35, the upper frame 101a and lower frame 101b with the screen master 8 in between are fixed by a force in a direction perpendicular to the screen master 8. That is, the fixing means 330 is attached to the lower surface side of the lower frame 101b, and pushes the upper surface of the upper frame 101a toward the lower frame 101b using the screw 326 and the seat 328. Therefore, the upper frame 101a and the lower frame 101b are pressed against each other by a force acting only in the vertical direction, with their lower and upper surfaces in contact with each other, so that the screen master 8 is securely fixed.

Further, as described above, the fixing force between the upper frame 101a and the lower frame 101b that sandwich the screen master 8 is determined by the screw 326 of the operating body 324 rotated using the torque wrench 329. A torque wrench is a work tool for tightening screws to a predetermined torque, and it eliminates the need for expensive measuring instruments and equipment required to measure axial force, and eliminates loosening due to insufficient tightening by controlling tightening using torque. This can prevent damage caused by over-tightening.

The torque to be applied to the screw 326 of the fixing means 330 when the screen master 8 is stretched on the mounting frame 101 is determined in advance through experiments or the like. During work, by setting the set torque of the torque wrench 329 to a predetermined value and tightening the screw 326, the fixing force of the screen master 8 by the upper frame 101a and the lower frame 101b can be set to the desired value. . Therefore, when the screen master 8 stretched on the attachment frame 101 is pushed up by the frame 17, the screen master 8 does not fall out from between the upper frame 101a and the lower frame 101b.

The torque to be applied to the screw 326 of the fixing means 330 described above can be set from various viewpoints. Considering the number of meshes in the Screen Master 8, the larger the number of meshes and the finer the mesh, the greater the strength, the stronger the tension, and the greater the push-up force in the process of pushing up with the frame 17. The torque given to 326 is set to be large. For example, according to the experiments of the present inventor, in this gauze tensioning device 300, when the screen master 8 has a mesh number #70 and is stretched on the mounting frame 101 with a torque of 6 N·m, the screen master 8 It came off from the mounting frame 101 due to the pushing up. Further, when the screen master 8 had a mesh number of #200, when it was stretched on the mounting frame 101 with a torque of 8 N·m, the screen master 8 came off from the mounting frame 101 due to the pushing up of the frame 17. From these results, it is preferable that the torque applied to the screw 326 of the fixing means 330 exceeds at least 8 N·m.

Also, considering the size of the frame 17 to which the screen master 8 is finally attached, the larger the frame 17 is, the greater the warpage that occurs when the screen master 8 is pushed up, and the screen master 8 It is preferable to apply a larger torque to the screw 326 of the fixing means 330 than when using a small frame 17, since this makes it easier for the frame 17 to come off.

Furthermore, considering the number of frames 17 that are finally attached to one screen master 8 in one process, the smaller the number of frames 17, the less warping occurs when the screen master 8 is pushed up. The case where there are two frames 17 as in the example shown in FIG. 25 is better than the case where there is one frame 17 as in the example shown in FIG. 24 described in the second embodiment. The warpage is large. Therefore, when the number of frames 17 is small, the torque applied to the screws 326 of the fixing means 330 can be made smaller than when the number of frames 17 is large. Alternatively, the number of fixing means 330 may be reduced, for example, one fixing means 330 may be provided for each side of the mounting frame 101.

After the screen master 8 is stretched on the frame 17 with an appropriate force, the motor 111 of the jack 110 is driven to raise the drive section 113, and the frame support section 115 is placed on the bottom side of the screen master 8 (on the porous support). side) to further push up the frame support part 115 and push up the screen master 8. After that, the screen master 8 is fixed to the frame 17.

As explained above, according to the gauze tensioning device 300 of this embodiment, the screen master 8 is sandwiched between the upper frame 101a and the lower frame 101b, and the fixing means 330 is moved along the attachment frame 101 to set it at an appropriate position. The upper frame 101a and the lower frame 101b are fixed by a force in a direction perpendicular to the screen master 8. The screen master 8 is reliably fixed by the upper frame 101a and the lower frame 101b at optimal positions on each side by vertical loads. Further, the tightening torque of the screw 326 of the fixing means 330 is controlled to an appropriate value by the torque wrench 329 so that it becomes a value appropriately set depending on the number of meshes of the screen master 8 used, the size and number of the frame 17, etc. has been done. Therefore, when the stretched screen master 8 is pushed up by the frame 17, the problem that the screen master 8 comes off from the attachment frame 101 is unlikely to occur. Note that, since the load by the fixing means 330 acts only in the vertical direction on the upper frame 101a and the lower frame 101b, there is a small possibility that a lateral component force will act on the upper frame 101a or the lower frame 101b. There is little risk that the mounting frame 101 or the fixing means 330 itself will be damaged by the load.

In addition, in the third embodiment described above, the fixing means 330 is provided on the lower frame 101b, but it may be attached to the guide groove 290 formed on the upper frame 101a as shown in FIG. 10, and the mounting frame 10 may be fixed as required. Note that the number of fixing means 330 is arbitrary.

8. Frame 17 used in the gauze tensioning device of each embodiment (FIGS. 36 to 39)
The frame body 17 that performs gauze tensioning in the gauze tensioning apparatus 1, 100 of each of the embodiments described above is coated with a chloroprene rubber solvent-based adhesive, hot melt adhesive, acrylic adhesive, etc. on the pasting surface in a predetermined manner. It is necessary to apply it so that it is thick. For this purpose, it is necessary to apply the adhesive to the attachment surface multiple times and dry it, which takes from 5 hours to 1 day.

As a frame body for gauging with the gauze tensioning apparatus 1, 100 of each of the embodiments described above, a frame body with a short preparation time for applying an adhesive will be described.
After applying the adhesive 27 as shown in FIG. 36(b) to the attachment surface 25 of the frame 17 shown in FIG. 36(a), as shown in FIG. The nonwoven fabric 200 is pasted, and the adhesive 27 is reapplied to the upper surface of the nonwoven fabric 200. The adhesive 27 soaks into the nonwoven fabric 200 from both the upper and lower surfaces, and the nonwoven fabric 200 is attached to the attachment surface 25. If this is dried, it can be used for gauze. According to the configuration using such a nonwoven fabric 200, the work of applying the adhesive 27 to the frame 17 in advance to a predetermined thickness can be shortened to about one hour, and the number of man-hours required for gauze can be reduced. can be significantly reduced.

As a frame body for gauging with the gauze tensioning apparatus 1, 100 of each of the embodiments described above, another frame body with a short preparation time for applying the adhesive 27 will be described.
As shown in FIGS. 37 and 38, wedge-shaped slits 122 are formed on the attachment surface 25 of the frame 120 on each side of the frame 120. Continuously formed parallel to. As the adhesive 27, a hot melt adhesive is used. The molten adhesive 27 is poured into the slit 122 until it reaches a thinly exposed position on the attachment surface 25 on each side of the frame 120. By hardening the adhesive 27 in this state, a layer of the adhesive 27 that has a predetermined thickness and is difficult to peel off from the frame 120 can be formed in a short time.

Regarding the frame 123, which performs gauze tensioning in the gauze tensioning apparatus 1, 100 of each of the embodiments described above, the preparation time for applying the adhesive 27 is short, and the time for removing the adhesive after use is short. explain.
As shown in FIG. 39, wedge-shaped slits 124 are formed on the attachment surface 25 of the frame 123 in parallel to each side of the frame 123, the width of which increases from the surface toward the inside when viewed in cross section. Form continuously. Here, the frame 123 is composed of an outer frame 123a that includes a part of the attachment surface 25, and an inner frame 123b that is a part other than the outer frame 123a and includes the remaining part of the attachment surface 25. There is. The slit 124 formed in the outer frame 123a has a wall portion 125 including a part of the attachment surface 25, and a return portion 126 on the opposite side of the wall portion 125 with the slit 124 in between. When the inner frame 123b and the outer frame 123a are combined, a frame body 123 with a slit 124 opened in the attachment surface 25 is formed, and when the outer frame 123a is slid in the horizontal direction, the inner frame 123b and the outer frame 123a can be separated. As the adhesive 27, a hot melt adhesive is used. The molten adhesive 27 is poured into the slit 124 to a position where it is thinly exposed on the attachment surface 25 on each side of the frame 120. By hardening the adhesive 27 in this state, a layer of the adhesive 27 that has a predetermined thickness and is difficult to peel off from the frame 123 can be formed in a short time.

According to this frame 123, the adhesive 27 that has flowed into the wedge-shaped slit 124 and solidified is difficult to peel off from the frame 120 because it is larger inside. If you want to remove the adhesive 27 in order to attach another screen master 8 after use, remove the adhesive 27 in the slit 124 by sliding the outer frame 123a horizontally and removing it from the inner frame 123b. 126 and can be taken out of the slit 124 together with the outer frame 123a.

9. About the structure of the frame body and screen plate of each aspect in the embodiment and their effects The frame body 17 of the first aspect is
A screen plate frame 17 in which the gauze of the screen master 8 made of a thermoplastic resin film and gauze is attached to the attachment surface 25 with an adhesive 27,
A low friction material 30 having a predetermined thickness and a friction coefficient of 0.25 or less is provided on the outer periphery of the attachment surface 25, and a gap is formed between the adhesive 27 and the screen master 8. .

According to the frame 17 of the first aspect,
By applying the low friction sheet 30 to the attachment surface 25 of the frame 17, the resistance when the screen master 8 pushed up by the frame 17 moves on the attachment surface 25 can be reduced. Moreover, according to this low-friction sheet 30, the sliding at the edge of the frame 17 is improved, and the resistance is reduced. For this reason, the screen master 8 is less likely to be torn, and can be stretched and crimped onto the frame 17 with the necessary tension.

The frame 17 of the second aspect has the following features in the frame 17 of the first aspect:
The low friction material 30 is provided on the adhesive 27 applied to the outer periphery of the attachment surface 25 out of the adhesive 27 applied to the attachment surface 25. .

According to the frame 17 of the second aspect,
By applying the low-friction sheet 30 on the upper surface of the outer periphery of the adhesive 27 applied to the attachment surface 25 of the frame 17, the height of the low-friction sheet 30 increases to the extent that there is a gap between the screen master 8 and the adhesive 27. cause Therefore, the resistance when the screen master 8 pushed up by the frame 17 moves on the attachment surface 25 can be reduced.

The screen version of the third aspect is
A frame body 17;
an adhesive 27 applied to the attachment surface 25 of the frame 17;
A low-friction sheet 30 as a low-friction material having a friction coefficient of 0.25 or less at a predetermined thickness and provided on the adhesive 27 applied to the outer periphery of the attachment surface 25 of the adhesive 27. and,
a screen master 8 made of a thermoplastic resin film and gauze bonded together, and adhered to the attachment surface 25 with the adhesive 27 with the gauze in contact with the low-friction material;
It is characterized by having the following.

According to the screen version of the third aspect:
Pushing up the screen master 8 with the frame 17 When the screen master 8 is stretched, the resistance when the screen master 8 pushed up by the frame 17 moves on the pasting surface 25 is small, so the screen master 8 can be pushed up as needed. It is possible to stretch the gauze on the frame 17 with tension and press and fix it, so that the gauze can be stretched evenly and with high tension.

The frame 17 of the fourth aspect is
A screen plate frame 17 in which the gauze of the screen master 8 made of a thermoplastic resin film and gauze is attached to the attachment surface 25 with an adhesive 27,
A nonwoven fabric 200 containing an adhesive 27 is bonded to the attachment surface 25 by the adhesive 27.

According to the frame 17 of the fourth aspect,
Since the nonwoven fabric 200 is adhered to the attachment surface 25 of the frame body 17 with the adhesive 27, the work of applying the adhesive 27 to the frame body 17 in advance to a predetermined thickness is the same as applying the adhesive. The process can be shortened compared to the process of repeatedly drying to obtain the desired thickness, and the number of man-hours required for gauze can be significantly reduced.

DESCRIPTION OF SYMBOLS 1,100,300... Gauze tensioning device 5,101... Mounting frame 8... Screen master 10,110... Jack 13,113... Drive part 16,115... Frame body support part 17,120,123... Frame body 20... Joint device 25...Pasting surface 27...Adhesive 30...Low friction sheet as a low friction material 101a...Upper frame 101b...Lower frame 118...Roller as a guide member 130, 330...Fixing means 160...Moving means 200...Nonwoven fabric 310...Fixing Slide part of means 320... Fixing part of fixing means 326... Screw 329... Torque wrench

Claims (3)

A screen plate frame body on which the gauze of a screen master made of a thermoplastic resin film and gauze is attached to the attachment surface with an adhesive,
A frame body characterized in that a low-friction material having a predetermined thickness and a friction coefficient of 0.25 or less is provided on the outer periphery of the attachment surface, and a gap is formed between the adhesive and the screen master. 2. The low-friction material is provided on the adhesive applied to the outer periphery of the attachment surface of the adhesive applied to the attachment surface. frame body A frame and
an adhesive applied to the attachment surface of the frame;
A low-friction material having a friction coefficient of 0.25 or less at a predetermined thickness and provided on the adhesive applied to the outer periphery of the attachment surface of the adhesive;
a screen master made of a thermoplastic resin film and gauze bonded together, and adhered to the attachment surface with the adhesive with the gauze in contact with the low-friction material;
A screen version characterized by having.

Images