KR19990047631A - Seamless Mold Closing Device - Google Patents

Abstract

The seamless shaping device comprises a frame assembly having a first arm structure and a second arm structure spaced apart from each other along a longitudinal injection axis, wherein a fixed die mounting structure is disposed on the first arm structure and the movable die mounting structure is movable. Disposed on the location device. The stationary, movable die mounting structures each have mounting surfaces approximately perpendicular along the injection axis and face each other, the stationary die mounting structures being pivotally attached to the first arm and attached to the first arm structure. Contains an element. The second arm structure includes a deterioration portion. The deterioration and elastic deformation component together compensate for the deformation of the frame assembly that occurs during operation of the device, thereby minimizing the separation of the mold halves during operation of the device.

Description

Seamless Mold Closing Device

The present invention relates to a barless mold closing device for an injection molding machine. In particular, the present invention relates to such a seamless mold closing device in which the closing and holding forces which occur during operation of the device are absorbed in the frame assembly of the device.

EP 0311133 A1 and DE-GM 9212480 have the advantage that the space in the device between the fixed and movable die mounting structure is unobstructed as a result of the U-shaped device frame. Describe the solution. As a result, the tool change is much simpler than the mold closing device in which the closing force is transmitted by a cross bar connecting the two die mounting structures. Furthermore, large mold dies requiring small closing forces can be used in the injection molding apparatus based on the excellent use of the mounting surface of the mounting structure, which is cost effective.

In order to achieve perfect parallelism of the two mold halves despite deformation of the device frame due to the very large forces that close and hold the die, EP 0311133 A 1 (EP 0311133 A1) has one of two mounting structures, It suggests that it is supported in such a way that it can be oblique.

DE-GM 9212480 further suggests that the stationary mounting structure is supported in such a way that it is oblique around the horizontal axis in the device frame and the movable die mounting structure is rotatable around the horizontal axis away from the structure. In order to prevent the movable die mounting structure from being lifted off the device frame, the movable die mounting structure is provided with a crosshead shoe for fitting with the guide bar. The guide bar is supported by a fixed mounting structure or device frame on one side. In order to ensure relative movement between the movable mounting structure and the guide bar, a spring is provided between the crosshead shoe and the movable mounting structure or the guide bar is fixed by a spring relative to the device frame.

Further, DE 2048258 (DE 2048258) describes a mold closure device of the genus concept for the production of plastic containers by a blow molding method, in which both die mounting structures can move towards and away from each other. have. Both die mounting structures are supported by the arms of the U-shaped device frame, which can pivot about one axis and are guided by suitable guide means.

All known solutions are disadvantageous in that a large and expensive bearing is required to support the fixed die mounting structure and / or the movable die mounting structure or to support the end plate of the device frame using the fixed die mounting structure and uniaxial support means. Has Furthermore, the parallelism of the mounting structures to each other is ensured only by suitable guide means. The uniaxial support and movable die mounting structure of the end plate, respectively, cause a tilt load which in turn causes severe wear of the guides of the molding die and the guides of the movable die mounting structure.

It is therefore an object of the present invention to find a more economical solution and thus to maintain the parallelism of the mold halves when the device frame is deformed by a large die force.

The present invention is a seamless mold closing device, comprising a frame assembly having a first arm structure and a second arm structure. The first arm structure is spaced apart from the second arm structure along the longitudinal injection axis. A fixed die mounting structure having a mounting surface perpendicular to the injection axis is disposed on the first arm structure.

A movable die mounting structure having a mounting surface approximately perpendicular to the ejection axis and facing the mounting surface of the fixed die mounting structure is disposed on the movable position device. The movable position device is constructed and arranged to move the movable die mounting structure along the injection between the movable die mounting structure and the first second arm structure.

The mold die consists of a first mold half disposed on the mounting face of the fixed die mounting structure and a second mold half placed on the mounting face of the movable die mounting structure. The movable position device, the first die half, the second die half and the die mounting structure are aligned along the aforementioned injection axis.

According to the present invention the fixed die mounting structure is pivotally attached to the first arm structure above the injection shaft and is aligned along a transverse axis extending approximately perpendicular to the injection axis. The fixed die mounting structure is formed such that the fixed mounting structure is pivoted with respect to the first arm structure. The fixed die mounting structure includes at least one elastically deformable component, which extends below the aforementioned injection axis in a direction approximately parallel to the injection axis integrally formed therewith and is attached to the first arm structure.

The second arm structure includes a weakened portion disposed below the injection shaft. The deformable portion of the second arm structure and the elastically deformable component integrally formed with the fixed die mounting structure are caused by the closing force and the holding force for holding the first and second die bodies together during operation of the device. By being constructed and arranged to compensate for deformation of the frame assembly, the die mounting surfaces remain approximately parallel to each other and separation of the first and second mold halves is minimized during operation of the apparatus.

1 shows a profile of a mold closing device embodying the principles of the present invention;

FIG. 2 is a profile view of the mold closing device of FIG. 1 showing a deformation of the frame assembly of the device due to the holding and closing forces occurring during operation of the device; FIG.

3 is a plan view of the mold closing device of FIG.

4 is a cross sectional view along line 4-4 of FIG. 1 showing a guide mechanism allowing the movable position device of the device to move along a longitudinal injection axis between the first and second arm structures of the frame assembly; Drawing;

5 is a cross sectional view along line 4-4 of FIG. 1 showing another alternative to the guide mechanism of FIG. 4;

6 is a profile view of an alternative embodiment of a mold closing device embodying the principles of the present invention;

FIG. 7 is a plan view of the mold closing device of FIG. 6; FIG.

8 is a profile view of a third embodiment of a mold closing device embodying the principles of the present invention.

With particular reference to FIG. 1, FIG. 1 is a view showing a profile of a mold closing apparatus, which is generally represented by 10 and is an embodiment of the invention. The mold closing device 10 comprises a u-shaped frame assembly and a movable position device, shown at 12 and 14, respectively.

The frame assembly 12 includes a generally rectangular base plate 16 that extends along the bottom of the frame assembly 12. Vertical sidewalls 18 extend generally upwardly from the base plate 16. The vertical sidewalls 18 extend along the length of the frame assembly 12 parallel to each other. At one end of the frame assembly 12 is a first arm structure 20. The first arm structure 20 consists of plate-like portions 22 extending upwardly from the frame assembly 12 in a generally vertical direction. These upperly extending portions 22 are formed continuously with the vertical sidewalls 18 and are spaced parallel to each other. The second arm structure 24 is located at the other end of the frame assembly 12 and is generally spaced horizontally from the first arm structure 20 along the longitudinal axis 28. Like the first arm structure 20, the second arm structure also consists of plate-like portions 26 extending upwardly generally in the vertical direction from the frame assembly 12. These upwardly extending portions 26 are formed continuously with the sidewalls 18 and extend upwardly therefrom in a vertical direction parallel to each other.

The movable position device 14 is coupled with the second arm structure 24. The movable position device 14 is movable along the longitudinal injection shaft 28 extending from the first arm structure 20 to the second arm structure 24 as a linear drive. A portion of the movable positioning device 14 extends through the second arm structure 24 between the portions 26 extending upwards of the frame assembly 12. The end plate 27 is fixedly mounted to the second arm structure 24 by bolts 29 or by welding or other suitable coupling means and moves the movable positioning device 14 in alignment with the injection shaft 28. Support and maintain The movable position device 14 is driven by a hydraulically actuated cylinder (not shown) or other suitable drive mechanism that generates the force required to actuate the mold closing device 10. The movable positioning device 14 also includes a movable die mounting structure 30 located at the end of the movable positioning device 14.

The movable die mounting structure 30 has a generally vertical mounting surface 32 which is generally perpendicular to the injection axis 28 facing the fixed die mounting structure 34. The fixed die mounting structure 34 is attached to the first arm structure 20 and is generally perpendicular to the injection axis that is parallel to and opposite the generally vertical mounting surface 32 of the movable die mounting casting 30. Generally having a vertical mounting surface 36.

The generally vertical mounting surfaces 32, 36 of the stationary and movable die mounting structures 30, 34 are configured to receive a pair of mold halves 38, 40. As can be seen in FIG. 1, the movable positioning device 14, the die mounting structure 30, 34, the generally vertical mounting surfaces 32, 36 and the first second mold halves 38, 40 are in length. It is aligned along the injection axis 28 in the direction.

The fixed die mounting structure 34 is pivotally mounted to the first arm structure 20 by a pair of bearings 42. The bearings 42 are aligned along the transverse axis 44 as well seen in FIG. 3. The horizontal axis 44 extends in the transverse direction in a direction generally perpendicular to the injection axis 28. As shown in FIG. 3, the bearings 42 pivotally attach the fixed die mounting structure 34 to portions 22 extending above the first arm structure 20. These bearings 42 cause the fixed die mounting structure 34 to pivot about the first arm structure 20 about the transverse axis 44.

One set of elastically deformable elements in the form of compression bars 46 extends outwardly from the fixed die mounting structure 34 in a direction generally parallel to the aforementioned injection axis 28. . Preferably, as shown in FIG. 3, these compression bars 46 are disposed in sets of pairs formed integrally with and extending from each side of the fixed die mounting structure 34 and the injection shaft 28. Symmetrically with respect to

Each pair of compression bars 46 is pivotally attached to the upwardly extending portions 22 of the frame assembly 12 by a set of bearings 48. These bearings 48 are generally aligned in the transverse direction which extend generally parallel to the transverse axis 44 and allow the compression bars 46 to move in a pivotal relationship with respect to the first arm structure 20. The compression bars 46 also have cut-out portions 50 that facilitate the elastic deformation of the compression bars 46. The compression bars 46 may have hollow portions (not shown) than the cutouts 50.

The frame assembly generally includes a guiding mechanism, shown at 52. As shown in FIG. 4, the guide mechanism 52 consists of a set of guide rails 54 attached to each vertical sidewall 18 of the frame assembly 12. The guide rails 54 are attached to the sidewalls 18 by a set of bolts mounted on pleats (not shown) disposed on the sidewalls of the frame assembly 12. On both sides of each side wall 22 are spaced discs 58 that hold the guide rail 54 at a distance relative to the side wall 18. A set of rollers 60 is fixed to the bottom of the movable die mounting structure 30. These rollers 60 are configured to be connected to the faces 62 facing the top of the guide rails 54 in a rolling relationship. These rollers 60 and the guide rails 54 support the movable die mounting structure 30 such that the movable die mounting structure 32 is ejected between the first and second arm structures 20 and 24. It can be moved along axis 28.

5 shows another embodiment of the guide mechanism 52 described with reference to FIG. 4. Like the guide mechanism 52 shown in FIG. 4, the guide mechanism of FIG. 5 includes guide rails 64. The guide rails 64 are attached to the vertical sidewall 918 of the frame assembly 12 by bolts 66 to some extent similar to that described with reference to FIG. 4. The guide rails 64 are maintained at a distance relatively spaced from the vertical sidewalls 18 by a spaced disk 68. In place of the rollers 60, a lower portion of the movable die mounting structure 30 extends longitudinally along the lower portion of the movable die mounting structure 30 and with sidewalls 18 of the frame assembly 12. Opposite horizontally formed grooves 70 are installed. The inner surface of the laterally formed grooves 70 forms a row with sliding materials 72 having a low coefficient of friction. The horizontally formed groove 70 is configured to connect with the guide rails 64 disposed inside the sidewalls 18 in a sliding relationship such that the multi-die die structure 30 has the guide rails 64. It is supported by and can move between the first arm structure 20 and the second arm structure 24 along the injection axis 28 of the.

The second arm structure 24 includes a weak end portion 76. The degradation portion 76 is a cavity formed in portions 26 extending upwardly of each of the frame assemblies 12 located below the injection shaft 28 and is an opening inwardly as the frame assembly 12. Preferably, the weakened portion has a semicircle configuration behind the cavity.

As can be seen in FIG. 2, the movable die mounting structure allows the injection shaft 28 by the movable positioning device 14 to be in a closed position where the first second die halves 38, 40 are held under pressure. Is moved along. The force to pressurize and maintain the first second die halves 38, 40 causes deformation of the frame assembly 12 as shown in the exaggerated manner in FIG. 2. In a conventional mold closing device this deformation caused the separation of the upper sides of the mold halves 38, 40.

However, the mold closing device 10 processor according to the present invention is fixed die mounting structure 34 mounted to the first arm structure 20 to be pivotable as described above and pivotable thereto. The compression bars 46 are elastically deformed in a compressed manner and thus allow the generally vertical mounting surface 36 of the fixed die mounting structure 34 to be maintained in a generally vertical direction. Similarly, the second arm structure 24 deterioration 76 allows the frame assembly 12 to be deformed without affecting the alignment of the movable positioning device 14 along the longitudinal axis 28. Maintain the generally vertical mounting surface 36 of the movable die mounting structure 30 in a generally vertical direction parallel to the generally vertical mounting surface 36 of the fixed die mounting structure 34. By maintaining the generally vertical mounting surfaces 32, 36 parallel to each other, the die halves 38, 40 remain pressed together and are not separated from each other. Accordingly, the deterioration portions 76 of the compression bars 46 and the first second arm structures 20, 24 are each generated by a force for closing and holding the first mold halves 38, 40. Compensation for deformation of the frame assembly 12 and minimization of separation of the first second mold halves 38, 40.

6 shows a second embodiment of the present invention. Where this applies, the structures of the second embodiment corresponding to the first embodiment of the present invention are given the same reference numerals. As such, the mold closing device 10 according to the second embodiment of the invention comprises a frame assembly 12 having a base plate 16 and vertical sidewalls 18 extending therefrom. The mold closing device 10 also includes a movable position device 14 coupled with the second arm structure 24. In addition, a guide mechanism 52 such as that described with reference to FIGS. 4 and 5 is included on the frame assembly 12 of the mold closing device 10 so as to provide a first arm structure 20 and a second arm structure ( The movable die mounting structure 30 is supported as it moves along the longitudinal injection shaft 28, which generally extends transversely, between 24).

The first arm structure 20 consists of upper extension portions 22 of the frame assembly that are formed continuously with the vertical sidewall 18 and generally extend therefrom. The upper extension portions 22 are spaced parallel to each other symmetrically with respect to the injection axis 28. Attached to the first arm structure 20 is a fixed die mounting structure 34. In the second embodiment of the invention, the fixed die mounting structure 34 is fixedly attached to the first arm structure 20 by bolts or welding or other suitable coupling means. As before, the fixed die mounting structure 34 has a mounting surface 36 that is generally vertical.

Furthermore, the first arm structure 20 includes a deterioration portion 80. Preferably, the deterioration portion 80 is comprised of a cavity cut into the upper extension portion 22 of the frame assembly 12. These cavities have a semicircle configuration and the frame assembly 12 opens inward.

The second arm structure 24 consists of an upper extension portion 26 extending upwardly from the frame assembly 12 in a generally perpendicular direction and continuously formed with the side walls 28. The upper extension part 26 is spaced parallel to each other symmetrically with respect to the injection axis 28. The end plate 82 is pivotally mounted to the second arm structure 24 by a set of bearings 84. As can be seen in FIG. 7, the bearings are aligned along a transverse axis 87 which extends transversely in a direction generally perpendicular to the ejection axis 28. The bearings 84 pivotally attach the end plate 82 to the upper extension portions 26 of the second arm structure 24. These bearings 84 allow the end plate 82 to pivot in a second arm structure 24 about the transverse axis 87. The end plate 82 supports the movable positioning device 14 and keeps it aligned with the injection shaft 28.

The end plate 82 has two pairs of compression bars 86, which extend generally transversely from the bottom of the end plate 82 parallel to the ejection axis 28. Each pair of compression bars 86 is pivotally mounted to the upper extension portion 26 of the frame assembly 12 by a bearing set 88. The compression bars 86 preferably include a cutout 90 to facilitate elastic deformation of the compression bars 86. The compression bars 46 may have hollow portions (not shown) than the cutouts 92.

As described with reference to the first embodiment above, the force to close and hold the die halves 38, 40 together causes a deformation of the frame assembly, an example of which is shown in FIG. 2. The degradation portion 80 of the first arm structure allows the frame assembly 12 to be deformed without affecting the alignment of the fixed die mounting structure 34, so that the vertical mounting surface in the generally vertical direction ( 36). The bearings 84 allow the end plate 82 to pivot with respect to the second arm structure 24 and the compression bars 86 are elastically deformed in a compressed manner, such that the frame assembly 12 Allows the die to be deformed without affecting the alignment of the movable position device 14, the movable die in a generally vertical direction parallel to the generally vertical mounting surface 36 of the fixed die mounting structure 34. Maintain a generally vertical mounting surface 32 of the mounting structure 30. Accordingly, the deterioration portion 80 of the first arm structure 20 and the compression bars 86 of the end plate 82 are derived from the closing and retaining forces that occur during the operation of the device 10. ) And maintain the generally vertical mounting surfaces 32, 36 of the die mounting structures 30, 34 parallel to each other to avoid separation of the first second mold halves 38, 40. Minimize.

8 shows a third embodiment of a mold closing device 10 according to the principles of the present invention. As before, where applicable, structures corresponding to the first and second embodiments will be given the same reference numerals. The structure of the mold closing device 10 shown in FIG. 8 is similar to that described with reference to FIGS. 6 and 7, but the end plate 96 is connected to the end plate of the mold closing device 10 shown in FIGS. 6 and 7. Likewise, instead of being mounted inside the second arm structure 24, it is mounted outside the second arm structure 24. The end plate 96 is pivotally mounted by bearings 98 aligned along a transverse axis that extends generally in the transverse direction above the injection axis 28 and is generally perpendicular to the injection axis 28. .

The bearings 98 used to mount the end plate plate 96 are similar to those described in the first second case of the invention. The movable positioning device 14 is supported and maintained in alignment with the longitudinal axis 28 by the end plate 96. In this third embodiment, the compression bars are not used as in the first second embodiment. Thus, when the frame assembly 12 is deformed by the closing and retaining forces that occur during the operation of the device 10, the end plate 96 allows it to pivot outward with respect to the second arm structure 24. The frame structure 12 is thus deformed without affecting the alignment of the movable position device 14 and maintains the generally vertical mounting surface 32 of the movable die mounting structure 30 in a generally vertical direction. Let's do it. As described with reference to FIGS. 6 and 7, the degradation portion 80 of the first arm structure 20 allows the frame assembly to be deformed without affecting the alignment of the fixed die mounting structure 34, and is therefore general. To maintain the generally vertical direction of the die mounting surface 36 that is vertical. Thus, the pivoting behavior of the deterioration 80 and the end plate 96 compensates for deformation of the frame assembly 12 and maintains the vertical die mounting surfaces 32, 36 in generally perpendicular directions parallel to each other. Thereby minimizing the separation of the first second mold halves 38, 40.

Although the principles of the present invention have been clearly described by way of example, various modifications in structure, arrangement, proportions, elements, materials and components necessary for the practice of the present invention will be apparent to those skilled in the art. It is obvious. The scope of these various modifications does not depart from the spirit and scope of the following claims.

Claims (21)

A U-shaped frame assembly having a first arm and a second arm structure, wherein the first arm structure is spaced apart from the second arm structure along the longitudinal injection axis; A fixed die mounting structure having a mounting surface approximately perpendicular to the ejection axis and disposed on the first arm structure; A movable die mounting structure having a mounting surface approximately perpendicular to the injection axis and facing the mounting surface of the fixed die mounting structure and movable along the injection axis with respect to the second arm structure; A movable position device constructed and arranged to move a movable die mounting structure along an ejection axis between the first and second arm structures; The movable position device, the first die half body, the second die half body, and a first mold half body disposed on the mounting face of the fixed die mounting structure, and a second mold half body disposed on the mounting face of the movable die mounting structure. A mold die having a die mounting structure aligned along the injection axis; Made up of Wherein the fixed die mounting structure is pivotally attached to the first arm structure above the injection shaft and is aligned along a transverse axis extending approximately perpendicular to the injection axis, the fixed mounting structure with respect to the first arm structure. Is formed to be turned, The fixed die mounting structure includes an elastically deformable component formed integrally therewith, attached to the first arm structure, extending below the injection shaft in a direction approximately parallel to the injection axis, The second arm structure includes a deterioration portion disposed below the injection shaft, The deformable portion of the second arm structure and the elastically deformable component integrally formed with the fixed die mounting structure are caused by the closing force and the holding force for holding the first and second die bodies together during operation of the device. Configured and arranged to compensate for deformation of the frame assembly such that the die mounting surfaces remain approximately parallel to each other and separation of the first and second mold halves is minimized during operation of the apparatus. Seamless molding closing device. The method of claim 1, And the deterioration portion is made of a cutout cavity of the second arm structure. The method of claim 2, And the cavity has an approximately semi-circular opening towards the interior of the device. The method of claim 1, And a guide mechanism structured and arranged to support the movable position device as it moves along the injection axis. The first arm of claim 1, wherein the elastically deformable component is at least one compression bar integrally formed with the stationary die mounting structure, the first arm being at least one bearing aligned in a direction extending substantially parallel to the transverse axis. Seamless closing device for injection molding machine, characterized in that mounted on the structure. The method of claim 5, And the at least one compression bar has a recessed portion. The method of claim 5, The at least one compression bar is a seamless molding closing device for an injection molding machine, characterized in that it has a hollow portion. A u-shaped frame assembly having a first arm and a second arm structure wherein the first arm structure is spaced apart from the second arm structure along the longitudinal injection axis; A fixed die mounting structure having a mounting surface approximately perpendicular to the ejection axis and disposed on said first arm structure; An end plate disposed on the second arm structure; A movable die mounting structure having a mounting surface substantially perpendicular to the injection axis and facing the mounting surface of the fixed die mounting structure, movable along the injection axis with respect to the second arm structure, disposed on the movable positioning device; ; A movable position device constructed and arranged to move a movable die mounting structure along an ejection axis between the first and second arm structures; A first mold half disposed on a mounting surface of the fixed die mounting structure and a second mold half disposed on a mounting surface of the movable die mounting structure, wherein the movable positioning device, the end plate, the first die half body, and the second A molding die having a die body and a die mounting structure aligned along the injection axis; Made up of Wherein the first arm structure includes a degradation portion disposed below the injection shaft, and the end plate is pivotally attached to the second arm structure at an upper portion of the injection shaft and extends substantially perpendicular to the injection shaft. Aligned along the cut axis, the end plate being pivotable relative to the second arm structure, The end plate is attached to an elastically deformable component attached to the second arm structure and extends below the injection axis in a direction approximately parallel to the injection axis, The deteriorating portion of the first arm structure, the elastically deformable component attached to the second arm structure and the end plate are subjected to a closing force and a holding force which together hold the first and second mold halves occurring during operation of the device. Wherein the die mounting surfaces remain approximately parallel to each other and the separation of the first and second mold halves is minimized during operation of the apparatus by being constructed and arranged to compensate for the deformation of the frame assembly due to Seamless molding closing device for molding machines. The method of claim 8, And the deterioration portion is made of a cut cavity of the first arm structure. The method of claim 9, And the cavity has a semicircular opening towards the interior of the frame assembly. 9. The seamless molding closing device for an injection molding machine according to claim 8, further comprising a guide mechanism constructed and arranged to support the movable position device as it moves along the injection axis. The method of claim 8, The elastically deformable component has one end detachably connected to the end plate and the other end detachably mounted on the second arm structure by one or more bearings aligned in a direction extending substantially parallel to the transverse axis. Seamless closing device for injection molding machine, characterized in that the one or more compression bar having. 9. The method of claim 8, wherein the elastically deformable component is mounted on the second arm structure by at least one bearing integrally formed in the end plate and aligned in a direction extending substantially parallel to the transverse axis. A seamless molding closing device for an injection molding machine, characterized in that the bar. 13. The seamless molding closing device of claim 12, wherein the at least one compression bar has a recess. The method of claim 12, And at least one compression bar having a hollow portion. 14. The seamless molding closing device of claim 13, wherein the at least one compression bar has a recess. The method of claim 1, And at least one compression bar having a hollow portion. A u-shaped frame assembly having a first arm and a second arm structure wherein the first arm structure is spaced apart from the second arm structure along the longitudinal injection axis; A fixed die mounting structure having a mounting surface approximately perpendicular to the ejection axis and disposed on said first arm structure; An end plate disposed on the second arm structure; A movable die mounting structure having a mounting surface approximately perpendicular to the injection axis and facing the mounting surface of the fixed die mounting structure and movable along the injection axis with respect to the second arm structure; A movable position device constructed and arranged to move a movable die mounting structure between the first arm structure and the second arm structure; A first mold half disposed on a mounting surface of the fixed die mounting structure and a second mold half disposed on a mounting surface of the movable die mounting structure, the movable positioning device, an end plate, a first die half body, a second die; A molding die having a half body and a die mounting structure aligned along the injection axis; Made up of Wherein the first arm structure includes a degradation portion disposed below the injection shaft, and the end plate is pivotally attached to the second arm structure at an upper portion of the injection shaft and extends substantially perpendicular to the injection shaft. Aligned along a cut axis, the end plate being pivotable relative to the second arm structure, Deformation of the frame assembly which generates a closing force and a holding force for holding the first mold half and the second mold half together is effected by the deterioration of the first arm structure and during the operation of the device and with respect to one or more bearings. Offset by the pivoting of the end plates, the die mounting surfaces remain substantially parallel to each other and the separation of the first and second mold halves is minimized during operation of the apparatus. Closed device. 19. The seamless molding closing device for an injection molding machine as claimed in claim 18, wherein said deterioration part is made of a cutout cavity of said first arm structure. The method of claim 19, And the cavity has a semi-circular opening facing the interior of the frame assembly. The method of claim 18, And a guide mechanism structured and arranged to support the movable position device as it moves along the injection axis.