JP3196927B2 - Sheet Clamping Equipment of Sheet Forming Machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sheet clamping device for a sheet forming machine. More specifically, the present invention relates to a sheet clamping apparatus of a sheet forming apparatus for forming a three-dimensional molded product from a thermoplastic resin sheet or a fiber-reinforced composite sheet mainly containing a thermoplastic resin.

[0002]

2. Description of the Related Art The following is a conventional technique relating to a sheet clamping apparatus. The clamp device described in Japanese Utility Model Publication No. 3-51104 is a method in which four front and rear and right and left clamp plates are moved, and the front and rear opening and closing claws do not need to be adjusted. Need to be installed or removed when replacing. Further, there is a problem that it is not easy to cope with a sheet having a small size due to its structure. The width of the front and rear upper sliders can be easily changed in the clamp device described in Japanese Utility Model Laid-Open No. 7-27828, but the left and right upper sliders are mounted between the front and rear upper sliders. The slider had to be replaced. In addition, there is a problem that the upper and lower portions of the clamp frame are required separately. The clamp device described in Japanese Patent Application Laid-Open No. 63-233819 is a method for improving the thickness of a molded product by sliding a sheet into a mold by using a structure in which a peripheral portion of the sheet can be moved inward by using a four-sided clamper. The purpose of use is different from that of the present invention. Further, there is a disadvantage that the clamp frame is required separately for the upper and lower portions, the size of the minimum sheet is determined by the number of clamp claws, and the size of the sheet that can be formed is limited.

[0003]

In short, in the conventional sheet four-side clamping device, the width of two opposing sides can be easily adjusted by turning a screw shaft when changing the sheet size, but the other two sides can be adjusted. In the adjustment, a clamp claw according to the width was added and removed, and it took time to adjust. Even if the adjustment can be easily made by rotating the four-sided screw shaft or driving by a motor, etc., the adjustment range is narrow due to its structure, especially when the vertical and horizontal sizes are smaller than about 1/2 the maximum sheet size. Had to replace parts significantly. As described above, each time the sheet size changes, the clamp part is partially attached and detached, and there is a basic disadvantage in that the adjustment takes time.

[0004] In the case of small-sized to large-scale production of a large variety of products in small quantities, the sheet size is changed several times a day and the setup is changed, so that waste of the setup change time greatly hinders productivity. Met. In other words, to improve productivity in a sheet forming machine, shortening and facilitating the adjustment time associated with changing the sheet size is a major issue.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has a wide adjustment range from a minimum size to a maximum size of a sheet and can automatically adjust the adjustment width over the entire stroke, thereby greatly reducing the adjustment time and labor. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided a sheet clamping apparatus for a sheet forming machine, comprising: a clamp frame having an opening wider than a maximum dimension of a sheet to be formed; A pair of lower sliders in the X direction that move so as to approach and separate from each other in the X direction, and a pair of lower sliders that are installed on the clamp frame with the opening interposed therebetween and move so as to approach and separate from each other in the Y direction A Y-direction upper slider slidably mounted in the Y-direction on the upper surface of each of the pair of X-direction lower sliders, and a slidably mounted X-direction on each of the upper surfaces of the pair of Y-direction lower sliders. An upper slider in the X direction, and one end of the upper slider in the Y direction is connected to an adjacent lower slider in the Y direction so as to be movable in the X direction. One end of the X-direction upper slider is movable in the Y-direction with respect to the adjacent X-direction lower slider and is connected to the X-direction slider so as not to be separated from each other, and each of the upper sliders has a length corresponding to the maximum sheet size. Characterized in that a clamper is attached. The sheet clamping device of the sheet forming machine according to claim 2, wherein the pair of X-direction lower sliders are driven by an X-direction drive unit and a tuning power transmission mechanism so as to be synchronized with each other with an opening center as a boundary, and approach and separate from each other. The pair of Y-direction lower sliders are driven by a Y-direction drive unit and a tuning power transmission mechanism so as to be tuned to and separated from each other with the opening center as a boundary. 4. The sheet clamping apparatus of a sheet forming machine according to claim 3, wherein each of the upper sliders has a guide shoe on a lower surface thereof, and a guide plate on a side edge thereof, and each of the lower sliders is orthogonal to the approach / separation direction. The upper slider guide shoe is inserted into the guide groove, and the guide plate is in sliding contact with a side edge of each lower slider. The sheet clamping device of the sheet forming machine according to claim 4, wherein the clamp frame is a box shape having the opening on an upper surface, the portion other than the opening is in a sealed state, and the upper and lower sliders are plate-shaped. It is characterized by. The sheet clamping device of the sheet forming machine according to claim 5, further comprising: a lower limit photoelectric sensor that detects a sagging lower limit of the sheet being heated and an upper limit photoelectric sensor that detects a sagging upper limit, based on a detection signal of each of the photoelectric sensors, An X-direction drive unit and / or a Y-direction drive unit is driven to keep the amount of sag of the sheet during heating within an allowable range.

According to the first aspect of the present invention, when the pair of X-direction lower sliders approach and separate in the X-direction, the X-direction upper sliders on the adjacent Y-direction lower sliders are pushed and pulled in the X-direction to form a pair of Y-direction sliders. By approaching and separating the lower slider in the Y direction, the upper slider in the Y direction on the adjacent lower slider in the X direction can be pushed and pulled in the Y direction to adjust the four side dimensions according to the sheet size. Sheets of various sizes can be clamped by the clamper. Therefore, various adjustments are unnecessary, and automatic adjustment without human intervention becomes possible. According to the second aspect of the present invention, both the pair of X-direction lower sliders and the pair of Y-direction lower sliders always move in synchronization by the synchronized power transmission mechanism, so that the dimensions can be concentrically changed for any sheet size. The adjustment operation is simplified. According to the third aspect of the present invention, the movement of the upper slider in the X direction or the Y direction with respect to the lower slider,
Guided by two parallel guide mechanisms consisting of a combination of a slide shoe and a guide groove and a combination of a guide plate and a side edge of a lower slider, the moving direction of the upper slider perpendicular to the approaching / separating direction of the lower slider is accurate. And the outer edge of the square sheet can be securely clamped.
According to the fourth aspect of the present invention, the degree of opening of the box-shaped clamp frame is adjusted by the plate-like upper and lower sliders. , The sheet can be pre-stretched blow-molded. According to the fifth aspect of the present invention, if the lower sliders that are opposed to each other are driven by the signal of the lower limit photoelectric sensor so as to be separated from each other and the separating operation is stopped by the signal of the upper limit photoelectric sensor, drooping due to heating of the central portion of the sheet is excessive. , And partial heating of the sheet can be prevented.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sheet clamp apparatus showing an embodiment of the present invention, and is a plan view showing a state where a width is adjusted to fit a sheet S1 of a maximum size, and FIG.
3 is a view showing a drive unit of each lower slider, and FIG. 3 is a view showing an arrow III of FIG. 2; FIG. 4 is a plan view showing each lower slider; and FIG. 5 is a view showing a lower slider and an upper slider. Enlarged plan view,
FIG. 6 is an enlarged sectional view showing the lower slider and the upper slider, and FIG.
Is a plan view of a sheet clamp device adjusted in width to fit a sheet S2 of the minimum size without the clamper, FIG. 8 is a plan view of the clamper, FIG. 9 is a side view of the clamper, and FIG. 11 is a plan view of a sheet clamping device adapted to the sheet width of FIG. 1, FIG. 11 is an explanatory diagram of a sheet sagging detection unit, and FIG. 12 is a side view showing a molding die and a clamping device.

The basic structure will be described with reference to FIGS.
Reference numeral 1 denotes a box-shaped clamp frame, in which an opening 2 having a size larger than the maximum sheet size is formed at the center of the upper surface, and other than the opening 2 is closed. As shown in FIG. 12, a lower mold 5 is provided inside the clamp frame 1.
2 is installed to be able to move up and down. An upper die 51 is provided above the clamp frame 1. And
FIG. 12 shows a case where a female die is used for the lower die 52 and a plug is used for the upper die 51 to pretension the sheet S, and then the upper die 51 is lowered, the lower die 52 is raised, and An example in which the sheet S is formed while vacuum suction is performed will be described.

On four peripheral sides of the opening 2 of the clamp frame 1, four lower sliders 4Ya, 4Yb, 4Y
Xc and 4Xd are slidably installed. Of these, a pair of lower sliders 4Xc and 4Xd are lower sliders in the X direction, and move so as to approach and separate from each other in the X direction. The other pair of lower sliders 4Ya and 4Yb are lower sliders in the Y direction, and move so as to approach and separate from each other in the Y direction.

On the upper surfaces of the X-direction lower sliders 4Xc and 4Xd, plate-like upper sliders 5Yc and 5Yd are slidably mounted in the Y direction. This upper slider 5Yc, 5
Yd is called a Y-direction upper slider. The upper sliders 5Xa, 5Xb are provided on the upper surfaces of the Y-direction lower sliders 4Ya, 4Yb.
Are slidably mounted in the X direction. The upper sliders 5Xa and 5Xb are referred to as X-direction upper sliders.

The clamp frame 1 is provided with motors 10, 20 and the like constituting a drive section for the lower sliders 4Ya, 4Yb, 4Xc, 4Xd, and the upper sliders 5Xa,
A clamper 8 is attached to 5Xb, 5Yc, and 5Yd.

The details of each section will be described below. As shown in FIG. 3, a motor 10 which is a Y-direction drive unit of the Y-direction lower sliders 4Ya and 4Yb is attached to a side wall of the clamp frame 1, and a screw shaft 1 as a tuning power transmission mechanism.
1, a transmission shaft 12, and a screw shaft 13 are provided on an upper lower surface of the clamp frame 1. The screw shaft 11 is directly connected to the motor 10 via a speed reducer, the screw shaft 11 and the transmission shaft 12 are connected by bevel gears 14 and 15, and the transmission shaft 12 and the screw shaft 13
Are connected by bevel gears 16 and 17. Screw shaft 11
Is a right-hand screw, which is screwed into a nut 18 attached to the lower surface of the lower slider 4Ya, and the screw shaft 13 is also a right-hand screw,
It is screwed into a nut 18 attached to the lower surface of the lower slider 4Yb. For this reason, the screw shaft 11,
13 rotate synchronously, the Y-direction lower slider 4Ya,
4Yb are synchronized with each other at the center of the opening 2 and
Move in directions and move away from each other.

A motor 20, which is an X-direction drive unit for the X-direction lower sliders 4Xc, 4Xd, is provided with a screw shaft 21, a transmission shaft 22, and a screw shaft 23 as a tuning power transmission mechanism. The transmission shaft 22 is directly connected to the motor 20 via a speed reducer, the screw shaft 21 and the transmission shaft 22 are connected by bevel gears 24 and 25, and the screw shaft 23 and the transmission shaft 22 are connected by bevel gears 26 and 27. . The screw shaft 21 is a right-hand screw and is screwed to a nut 18 attached to the lower surface of the lower slider 4Xc, and the screw shaft 23 is also a right-hand screw and screwed to the nut 18 attached to the lower surface of the lower slider 4Xd. are doing. Therefore, when the screw shafts 21 and 23 are synchronously rotated by the motor 20, the X-direction lower sliders 4Xc and 4Xd
Are moved synchronously so as to approach and separate from each other in the X direction. In the upper part of the clamp frame 1, there is an opening 50 for allowing the nut 18 to move.
Are formed. Although the screw shafts 11 and 13 and the screw shafts 21 and 23 are right-handed screws, they may be left-handed screws. In short, the opposing lower sliders 4Ya, 4Yb, 4Xc,
It suffices that 4Xd can move so as to approach and separate from each other in synchronization with the center of the opening 2 as a boundary.

Each lower slider 4Y shown by an imaginary line in FIG.
a, 4Yb, 4Xc, and 4Xd are shown by solid lines in FIG. As shown in FIG. 4, each lower slider 4Ya, 4Yb,
In each of 4Xc and 4Xd, a first guide groove 30 extending in the longitudinal direction is formed in a central portion, and a second guide groove 7 is formed in a side edge on a side adjacent to another lower slider.

As shown in FIGS. 5 and 6, slide guides 3a and 3b slidingly contacting the outer edges of the lower sliders 4Ya, 4Yb, 4Xc and 4Xd to guide the movement in the X and Y directions. , 3c, 3d are mounted on the clamp frame 1. Furthermore, as shown in FIG. 1, upper sliders 5Xa, 5Xb, 5Yc, and 5Yd are slidably attached to the sliders 4Ya, 4Yb, 4Xc, and 4Xd, respectively.

Next, these details will be described. FIG. 4-
As shown in FIG. 6, the upper sliders 5Xa, 5Xb, 5Y
Sliders 31 attached to the lower surfaces of c and 5Yd are fitted into the first guide grooves 30 formed in the lower sliders 4Ya, 4Yb, 4Xc and 4Xd, and are slidably guided. Further, each of the upper sliders 5Xa, 5Xb, 5Yc, 5
A guide plate 33 is attached to an outer side edge of Yd, and this guide plate 33 is attached to each of the lower sliders 4Ya, 4Yb, 4X.
c and 4Xd are in sliding contact with the outer side edges. With such a guide mechanism including the first guide groove 30 and the slider 31, and a guide mechanism including the guide plate 33 and the side edge of the lower slider, each of the upper sliders 5Xa, 5Xb, 5Yc, and 5Y.
d slides while maintaining the direction exactly in the longitudinal direction of each of the lower sliders 4Ya, 4Yb, 4Xc, and 4Xd.

The X-direction lower slider 4X shown in FIG.
The upper sliders 5Yc and 5Yd mounted on c and 4Xd slide in the Y direction, and the upper sliders 5Xa and 5Xb mounted on the lower sliders 4Ya and 4Yb in the Y direction slide in the X direction. , 5Y
The slide operation of d is performed by the push-pull operation of the lower sliders 4Ya, 4Yb, 4Xc, and 4Xd that are adjacent in the orthogonal direction. Next, a connection structure for that purpose will be described.

That is, in FIG. 7, one end of the X-direction upper slider 5Xa is connected to the adjacent lower slider 4Xc, one end of the Y-direction upper slider 5Yc is connected to the adjacent lower slider 4Yb, and one end of the X-direction upper slider 5Xb. Is connected to the adjacent lower slider 4Xd, and the tip of the upper slider 5Yd in the Y direction is connected to the adjacent lower slider 4Ya. Since all four connection structures are the same,
One connecting structure will be described with reference to FIGS.

A roller 6 is axially mounted on one end of the X-direction upper slider 5Xa, and a second guide groove 7 is formed on one side of the adjacent lower slider 4Xc and one side of the upper slider 5Yc so as to face vertically. The second guide groove 7 is provided on both sliders 4.
It extends along the longitudinal direction of Xc, 5Yc. The rollers 6 roll along the second guide grooves 7, but are restricted so as not to be separated from each other in a direction perpendicular to the rolling direction. Therefore, since the X-direction upper slider 5Xa is allowed to move in the Y-direction by the first guide groove 7 and the roller 6,
Lower slider 4 on which X-direction upper slider 5Xa is placed
Similarly, the movement of Ya in the Y direction causes the movement in the Y direction.
The movement in the direction is caused by being pushed and pulled by the movement of the adjacent lower slider 4Xc in the X direction. The second guide groove 7 is provided for the lower sliders 4Ya, 4Yb, 4X.
c, 4Xd only, the upper sliders 5Xa, 5Xb,
5Yc and 5Yd need not be formed. That is, the pushing and pulling of the adjacent upper sliders 5Xa, 5Xb, 5Yc, and 5Yd may be performed only by the lower sliders 4Ya, 4Yb, 4Xc, and 4Xd.

As described above, this movement following relationship applies to all four connection structures. Therefore, the movement of the upper sliders 5Xa and 5Xb in the X direction shown in FIG. 7 is caused by the movement of the lower sliders 4Xc and 4Xd in the X direction.
c, 5Yd movement in the Y direction is a Y direction lower slider 4Ya, 4Yd.
It is caused by the movement of Yb.

FIG. 7 shows the operation of each upper slider 5 as described above.
Xa, 5Xb, 5Yc, and 5Yd respectively move toward the center of the opening 2 and move to a position where the sheet S2 having the minimum size is clamped. As is clear from comparison with FIG. 4, each lower slider 4Ya, 4Yb, 4Xc,
4Xd are apart from each other, but each upper slider 5Xa, 5Xd
Xb, 5Yc and 5Yd are connected to each other by the roller 6 and the second guide groove 7, and each of the upper sliders 5Xa and 5X
The sheets S of various dimensions can be surrounded by b, 5Yc, and 5Yd.

Each of the upper sliders 5Xa, 5Xb, 5Y
A clamper 8 for clamping the sheet S is attached to c and 5Yd. FIGS. 1-2 and 8-9
, Each upper slider 5Xa, 5Xb, 5Yc,
On 5Yd, a support shaft 35 is rotatably supported by a bearing 36, and a cylinder 37 is provided at an appropriate position on the support shaft 35 by a lever 3.
8 are connected. A clamp plate 39 having a length corresponding to the length of each side of an appropriate maximum sheet size is attached to the tip of the lever 38. Therefore, when the cylinder 37 is driven to expand and contract and the clamp plate 39 is opened or closed, the periphery of the sheet S can be clamped and unclamped.

The opening and closing means of the clamp plate 39 is optional. Instead of the cylinder 37, a pinion is attached to one end of a support shaft 35, a rack is engaged with the pinion, and the rack is reciprocated by an air cylinder or the like. You may make it do. Further, a plurality of clamp claws may be attached at appropriate intervals instead of the clamp plate 39.

FIG. 1 shows a state in which a sheet S1 having a maximum size is clamped in the clamp device having the above-described structure, and FIG. 10 shows a state in which a sheet S2 having a minimum size is being clamped. In order to change from the clamped state of S2 to the clamped state of the sheet S1 having the maximum size, the following may be performed.

The motor 10 is driven to separate the lower sliders 4Ya and 4Yb in the Y direction from each other in the Y direction. This movement causes the Y-direction upper sliders 5Yc and 5Yd to slide toward the edge of the maximum-size sheet S2. At the same time, the motor 20 is driven to move the lower slider 4Xc, 4Xd in the X direction.
Are separated from each other in the X direction. This movement causes the X-direction upper sliders 5Xa and 5Xb to move to the maximum size sheet S2.
Slide toward the edge of the.

Thus, each of the upper sliders 5Xa, 5Xa,
FIG. 1 shows the result of the movement of Xb, 5Yc, and 5Yd. The sheet S2 having the largest size is clamped by the clamp plate 39 of the clamper 8 attached over the effective length of each of the upper sliders 5Xa, 5Xb, 5Yc, and 5Yd. be able to.

If the sheet size is intermediate between the maximum and minimum, each of the lower sliders 4Ya, 4Yb, 4Xc,
The Xd slide should be stopped halfway. Also,
If a rotation position detection sensor is attached to the motors 10 and 20, it can be automatically stopped at a position corresponding to the sheet size. As described above, according to the sheet clamp device of the present embodiment, the upper sliders 5Xa, 5Xb, 5Yc, and 5Yd are automatically adjusted without any need for manual operations, and the sheet width can be easily changed in a very short time. You can do it.

The sheet clamping procedure in the above embodiment is as follows. Clamp plate 39
In the open state (shown by chain lines in FIG. 9), and move the periphery of the sheet S to the upper sliders 5Xa, 5X
b, 5Yc, and 5Yd are placed so as to overlap the front edges, and the clamp plate 39 is closed to fix the sheet S (FIG. 9).
Solid line). The sides of the sheet S to be clamped can be any of four sides simultaneously or only two opposing sides. In the latter case, only the other two sides may be clamped while the upper slider that is not clamped is moved outside the sheet end face.
Further, as shown in FIG. 12, an air source (not shown) capable of supplying air is provided inside the clamp frame 1 and the sheet S
May be preloaded.

Next, the means for preventing the sheet from sagging during heating in the above embodiment will be described. In normal vacuum forming or compressed air vacuum forming, the sheet is often heated and formed with the four sides of the sheet fixed. However, if the draw-down (drip at the center) of the sheet softened during heating becomes large, the sheet is partially heated. There is a problem that the temperature of the portion approaching the temperature increases too much. As a countermeasure, the clamping device of the present invention clamps only two sides of the sheet S, and when the amount of drooping of the heated sheet S increases, the clamped side can be moved outward to return the drooping. did. For example, this can be achieved by driving only the motor 10 during heating to move only the upper slider 5Xa and the upper slider 5Xb outward in the Y-axis direction.

Therefore, as shown in FIG. 10, light passes through the center 0 of the opening 2 in the clamp frame 1,
A set of photoelectric sensors 41 and 42 and a set of photoelectric sensors 43 and 44 are attached. As shown in FIG. 11, the photoelectric sensors 41 and 42 are mounted at positions where the upper limit of the amount of sag is detected, and the photoelectric sensors 43 and 44 are mounted at positions where the lower limit of the amount of sag is detected.

As shown in FIG. 11A, the sheet S
Droops greatly due to heating, and the photoelectric sensors 43 and 44
When the light is blocked, the lower slider on the two sides is moved outward, and as shown in FIG.
When returning to the position 42, the movement of the lower slider may be stopped. Thus, it is possible to eliminate the disadvantage that the amount of sag of the sheet S becomes large due to the heating, the central portion of the sheet S approaches the heater too much, and the temperature of the sheet partially increases too much.

[0033]

According to the first aspect of the present invention, when a pair of X-direction lower sliders approach and separate in the X-direction, the adjacent X-direction upper sliders are pushed and pulled in the X-direction, and the pair of Y-direction lower sliders are pushed and pulled. The upper and lower sliders in the Y direction can be pushed and pulled in the Y direction by approaching and separating in the directions to adjust the four side dimensions according to the sheet size. Clampers attached to each upper slider clamp sheets of various sizes. can do. Therefore, various adjustments are unnecessary, and automatic adjustment without human intervention becomes possible. According to the second aspect of the present invention, since the pair of X-direction lower sliders and the pair of Y-direction lower sliders always move in synchronization by the synchronizing power transmission mechanism, the dimensions can be adjusted concentrically with respect to any sheet size. Operation becomes simple. According to the third aspect of the present invention, the movement of the upper slider in the X direction or the Y direction with respect to the lower slider is made of a combination of a slide shoe and a guide groove and a combination of a guide plate and a side edge of the lower slider.
Since the guide is guided by the guide mechanism, the moving direction of the upper slider, which is perpendicular to the approaching / separating direction of the lower slider, is accurately guided, and the outer edge of the square sheet can be reliably clamped. According to the fourth aspect of the present invention, the degree of opening of the box-shaped clamp frame is adjusted by the plate-like upper and lower sliders. , The sheet can be pre-stretched blow-molded. Claim 5
According to the invention, by driving the lower sliders facing each other to be separated by the signal of the lower limit photoelectric sensor and stopping the separating operation by the signal of the upper limit photoelectric sensor, it is possible to prevent dripping too much due to heating of the central portion of the sheet. In addition, partial heating of the sheet can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing a sheet clamping apparatus according to an embodiment of the present invention, in which a width is adjusted to fit a sheet S1 having a maximum size.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 shows each lower slider 4Ya, 4Yb, 4Xc, 4Xd
FIG. 3 is a view showing a drive unit of FIG.

FIG. 4 shows each lower slider 4Ya, 4Yb, 4Xc, 4Xd
FIG.

FIG. 5 shows lower sliders 4Ya and 4Xc and upper slider 5X.
It is an enlarged plan view which shows a and 5Yc.

FIG. 6 shows lower sliders 4Ya and 4Xc and upper slider 5X.
It is an expanded sectional view showing a and 5Yc.

FIG. 7 is a plan view of a sheet clamp device adjusted in width so as to fit a sheet S2 of a minimum size, without a clamper.

FIG. 8 is a plan view of the clamper 8. FIG.

FIG. 9 is a side view of the clamper 8;

FIG. 10 is a plan view of a sheet clamping device adapted to a sheet width of a minimum size.

FIG. 11 is an explanatory diagram of a sheet sagging detection unit.

FIG. 12 is a side view showing a molding die and a clamp device.

[Explanation of symbols]

 Reference Signs List 1 clamp frame 4Ya Y direction lower slider 4Yb Y direction lower slider 4Xc X direction lower slider 4Xd X direction lower slider 5Xa X direction upper slider 5Xb X direction upper slider 5Yc Y direction upper slider 5Yd Y direction upper slider 8 clamper 41 photoelectric sensor 42 photoelectric Sensor 43 Photoelectric sensor 44 Photoelectric sensor

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI B29L 22:00 B29L 22:00 (58) Investigated field (Int.Cl. ⁷ , DB name) B29C 51/26 B25B 11/00 B29C 51/06 B29C 51/10 B29C 51/38 B29C 71/06 B29C 51/42

Claims (5)

(57) [Claims] 1. A clamp frame having an opening wider than a maximum dimension of a sheet to be formed, and a pair of lower members in the X direction which are installed on the clamp frame with the opening interposed therebetween and move so as to approach and separate from each other in the X direction. Slider and
Installed on the clamp frame across the opening,
A pair of lower sliders in the Y direction moving so as to approach and separate from each other in the Y direction; an upper slider in the Y direction slidably mounted in the Y direction on upper surfaces of the lower sliders in the X direction; X mounted on the upper surface of each of the downward sliders so as to be slidable in the X direction.
One end of the upper slider in the Y direction is movable in the X direction with respect to the lower slider in the adjacent Y direction, and is connected inseparably in the Y direction, and one end of the upper slider in the X direction is adjacent to the upper slider in the Y direction. The lower slider is movable in the Y direction with respect to the lower slider in the X direction and is connected to the lower slider so as not to be separated from each other in the X direction. Each upper slider is provided with a clamper having a length corresponding to a maximum sheet size. Sheet clamp device for sheet forming machine. 2. The pair of X-direction lower sliders are driven by an X-direction drive unit and a tuning power transmission mechanism so as to be tuned to and separated from each other with an opening center as a boundary.
The sheet clamp of a sheet forming machine according to claim 1, wherein the downward slider is driven by a Y-direction drive unit and a tuning power transmission mechanism so as to be tuned to and separated from each other with the opening center as a boundary. apparatus. 3. Each of the upper sliders has a guide shoe on a lower surface thereof, and a guide plate on a side edge thereof, and each of the lower sliders has a guide groove formed in a direction orthogonal to the approach / separation direction. 3. The sheet clamp according to claim 1, wherein the guide shoe of the upper slider is inserted into the guide groove, and the guide plate is in sliding contact with a side edge of each lower slider. apparatus. 4. The clamp frame according to claim 1, wherein said clamp frame has a box shape having said opening on an upper surface, and other than said opening is in a sealed state, and said upper and lower sliders are plate-shaped. 4. The sheet clamping device of the sheet forming machine according to 2 or 3. 5. A lower limit photoelectric sensor for detecting a lower limit of sagging of a sheet being heated and an upper limit photoelectric sensor for detecting an upper limit of sag of the sheet. 5. The apparatus according to claim 1, wherein the driving unit is driven so that the amount of sagging of the sheet during heating falls within an allowable range.
A sheet clamping device for the sheet forming machine according to the above.