Mold closing mechanism with strip plate

Abstract

The utility model relates to a mold closing mechanism with a strip plate. An existing mold closing mechanism is complex in structure. The mold comprises a support, a mold plate assembly, a mold assembly and a band-type brake assembly, the mold plate assembly is opened and closed in a reciprocating mode and locked through the band-type brake assembly after driving the mold assembly to define a mold cavity, and the mold plate assembly comprises a fixed plate fixedly connected with the support and a movable mold plate capable of moving in parallel relative to the fixed plate. The band-type brake assembly comprises a holding piece arranged at the penetrating hole of the fixed plate and two long strip plates arranged on the two side portions of the movable mold plate respectively, the fixed ends of the long strip plates are perpendicularly and fixedly connected to the movable mold plate, the movable ends of the long strip plates penetrate through the penetrating hole and are exposed, and the holding piece clamps the long strip plates when the movable mold plate moves in place. Compared with the prior art, an original cylindrical threaded rod is improved into the long strip plates, the two separated long strip plates are used for carrying out band-type brake fixing on the movable mold plate, the structure of the mold closing mechanism is simplified by reducing the number of the long strip plates, the size of the fixed plate and the size of the movable mold plate can be effectively reduced, the production cost is reduced, and the use convenience is improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing, specifically to a mold closing mechanism. Background Technology

[0002] The existing mold clamping mechanism includes a fixed plate, a moving platen, and a fixed platen. These three plates are arranged parallel to each other. The moving platen is reciprocally positioned between the fixed and fixed plates. The distance between the moving platen and the fixed platen is adjusted by displacement, allowing the mold assembly positioned between them to precisely enclose and form a mold cavity for the production of plastic products. The fixed and fixed plates are fixedly connected by multiple tie rods. After the moving platen is in position, it needs to be fixed to the fixed plate by a brake assembly to ensure a fixed relative position between the moving and fixed plates. The brake assembly includes a threaded rod on the moving platen, a through hole in the fixed plate, and a brake element at the through hole. The threaded rod is cylindrical, with one end fixed to the moving platen and the other end passing through the through hole and engaging with the brake element. When the moving platen is in position, the brake element tightly clamps the threaded rod and positions the moving platen.

[0003] Because the threaded rod is cylindrical, in order to improve the positioning reliability of the moving template, four threaded posts need to be set around the periphery of the moving template, and four corresponding through holes need to be opened on the fixed plate and corresponding brake parts need to be set. This not only makes the mold closing mechanism complex, but also requires the width of the through holes to meet the structural strength requirements, which increases the size of the fixed plate, increases the material cost, increases the volume of the mold closing mechanism, and affects the ease of use. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a mold closing mechanism with elongated plates. The original cylindrical threaded rod is improved by replacing it with elongated plates. Two separate elongated plates are used to brake and fix the moving template. This simplifies the structure of the mold closing mechanism by reducing the number of elongated plates, and also effectively reduces the size of the fixed plate and the moving template, thereby reducing production costs and improving ease of use.

[0005] This utility model is achieved through the following means: a mold closing mechanism with long strips, including a support, a template assembly disposed within the support, and a mold assembly and a brake assembly disposed on the template assembly. The template assembly reciprocates in opening and closing and is locked by the brake assembly after driving the mold assembly to enclose and form a mold cavity. The template assembly includes a fixed plate fixed to the support and a movable template that can move parallel to the fixed plate. The brake assembly includes a clamping member disposed at a through hole in the fixed plate and two long strips disposed on both sides of the movable template. The fixed ends of the long strips are vertically fixed to the movable template, and the movable ends pass through the through holes and are exposed. The clamping member clamps the long strips when the movable template moves into position to limit the displacement of the movable template. The original cylindrical threaded rod was improved by replacing it with a long strip plate. Two separate long strip plates are used to clamp and fix the moving mold plate. A single long strip plate can simultaneously cover the upper and lower parts of the side of the moving mold plate. This increases the coverage area of ​​a single long strip plate, reducing the number of long strip plates required and simplifying the structure of the mold closing mechanism. It also effectively reduces the size of the fixed plate and the moving mold plate, lowering production costs and improving ease of use. In addition, the distance between the moving and fixed mold plates changes with the thickness of the mold assembly. By using longer long strip plates, it can accommodate mold assemblies of different thicknesses, ensuring that the long strip plates can still be used after changing mold assemblies of different thicknesses, thus increasing the applicability.

[0006] Preferably, the moving template remains parallel to the fixed plate during reciprocating movement, and the long strip extends in a direction perpendicular to the moving template so that the long strip passes through the perforation and moves synchronously with the moving template. During the reciprocating movement of the moving template, the long strip always passes through the perforation axis, which not only guides and limits the moving template, but also facilitates the brake assembly to lock the long strip.

[0007] Preferably, the perforation is divided into upper and lower unit holes by a reinforcing rib in the middle. The movable end of the elongated plate includes two parallel forked rods, which pass through the corresponding unit holes and are clamped and positioned by the brake assembly. The perforation is vertically elongated, with reinforcing ribs in the middle of the two side walls, dividing the perforation into two symmetrical unit holes. The top and bottom of the movable end of the elongated plate form independent and parallel forked rods, which can be inserted into the corresponding unit holes. This ensures that the elongated plate can move in tandem with the template and cooperate with the brake assembly through the forked rods. Furthermore, the reinforcing ribs reduce the size of individual holes, thereby increasing the structural strength of the fixing plate and preventing deformation under stress.

[0008] Preferably, the elongated plate is a vertically placed thin sheet extending perpendicular to the direction of the moving template, and the width of the elongated plate is less than its height. The vertical cross-sectional profile of the elongated plate is a vertical rectangle, which ensures that the elongated plate can simultaneously cover the upper and lower parts of the side of the moving template, ensuring that the upper and lower parts of the moving template are subjected to force synchronously and effectively maintain a vertical posture. It also reduces weight and lowers raw material costs while meeting the structural strength requirements of the elongated plate.

[0009] Preferably, the ratio of the height of the elongated plate to the height of the moving template is A, where 0.75 ≥ A ≥ 0.5, to increase the coverage area of ​​the elongated plate on the moving template. By increasing the height of the elongated plate, its coverage area on the moving template is expanded, ensuring that all areas of the moving template can be positioned by the elongated plate. Furthermore, by limiting the height of the elongated plate, the perforation height is reduced, thereby ensuring that the overall structural strength of the fixing plate meets the usage requirements.

[0010] Preferably, the two long strips are of equal height and parallel to each other. The long strips are placed on both sides of the moving template, which respectively play a role in locking and positioning the moving template, thereby ensuring that the moving template always remains parallel to the fixed plate and the fixed template.

[0011] Preferably, the fixed end of the elongated plate is located at the center of the side of the moving template facing the side wall of the fixed plate, so that the side of the moving template can be effectively locked and positioned by the corresponding elongated plate.

[0012] Preferably, the length of the long strip is greater than the distance between the fixed plate and the moving template. When the moving template moves back and forth, the long strip is always inserted into the corresponding hole, ensuring that the long strip is always inserted into the hole when the moving template moves back and forth, which facilitates the brake assembly to clamp and fix the long strip.

[0013] Preferably, the clamping member includes two opposing clamping plates arranged on both sides of the perforation and a driving part for opening and closing the clamping plates. The driving part drives the clamping plates to close and clamp the long strip plate inserted in the perforation. The clamping plates move in mirror motion and can switch between a clamping position for clamping the long strip plate and a separating position for separating the long strip plate, so that the long strip plate can reciprocate and be clamped and fixed.

[0014] Preferably, the movable end of the elongated plate and the facing surfaces of the corresponding clamping plates are provided with teeth. When the mold assembly closes to form the mold cavity, the clamping plates move closer together and the teeth mesh to restrict the deviation of the elongated plate. The meshing of the teeth improves the reliability of the clamping and prevents the moving template from deforming due to force deviation, ensuring that the product contour meets production requirements.

[0015] Preferably, the support is equipped with a guide rail, which guides the moving template to reciprocate in a parallel posture with the fixed plate, so as to switch the mold assembly opening and closing. The guide rail not only supports the moving template, but also guides the moving template to move along a preset path in a preset posture, ensuring that the moving template remains parallel to the fixed template during movement.

[0016] Preferably, an air chamber is provided between the fixed end of the elongated plate and the moving template. The relative position between the moving template and the elongated plate is adjusted by the air chamber to keep the moving template parallel to the fixed plate. The air chamber can both inflate to increase pressure, ensuring that the moving template can be locked and positioned by the elongated plate, and use its own deformation to eliminate the influence of the elongated plate's offset on the posture of the moving template, ensuring that the moving template always remains parallel to the fixed template.

[0017] The beneficial effects of this utility model are as follows: The original cylindrical threaded rod is improved into a long strip plate. Two separate long strip plates are used to brake and fix the moving template. A single long strip plate can cover the upper and lower parts of the side of the moving template at the same time. This not only reduces the number of long strip plates by increasing the coverage area of ​​a single long strip plate, thus simplifying the structure of the mold closing mechanism, but also effectively reduces the size of the fixed plate and the moving template, reduces production costs, and improves ease of use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mold closing mechanism described in Embodiment 1;

[0019] Figure 2 This is a cross-sectional view of the mold-closing structure described in Embodiment 1;

[0020] Figure 3 This is a schematic diagram of the injection molding machine described in Example 1;

[0021] Figure 4 This is a schematic diagram of the mold closing mechanism described in Embodiment 2;

[0022] Figure 5 This is a schematic diagram of the assembly structure of the fixing plate and the long strip plate described in Embodiment 2;

[0023] In the diagram: 1. Support, 2. Fixed plate, 3. Moving template, 4. Long strip plate, 5. Perforation, 6. Clamping plate, 7. Toothed pattern, 8. Guide rail, 9. Fixed template, 10. Unit hole, 11. Reinforcing rib, 12. Forked rod. Detailed Implementation

[0024] The essential features of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1:

[0026] This embodiment provides a mold closing mechanism.

[0027] like Figure 1 and 2 The mold closing mechanism shown comprises a support 1, a template assembly disposed within the support 1, a mold assembly and a brake assembly disposed on the template assembly. The template assembly reciprocates in opening and closing and, after driving the mold assembly to enclose and form a mold cavity, is locked by the brake assembly. The template assembly includes a fixed plate 2 fixedly connected to the support 1 and a movable template 3 that can move parallel to the fixed plate 2. The brake assembly includes a clamping member disposed at a through hole 5 in the fixed plate 2 and two long strips 4 disposed on both sides of the movable template 3. The fixed ends of the long strips 4 are vertically fixed to the movable template 3, and the movable ends pass through the through hole 5 and are exposed. The clamping member clamps the long strips 4 when the movable template 3 moves into position to limit the displacement of the movable template 3. The original cylindrical threaded rod was improved into a long strip plate 4. Two separate long strip plates 4 are used to brake and fix the moving template 3. A single long strip plate 4 can cover the upper and lower parts of the side of the moving template 3 at the same time. This not only reduces the number of long strip plates 4 by increasing the coverage area of ​​a single long strip plate 4, thus simplifying the structure of the mold closing mechanism, but also effectively reduces the size of the fixed plate 2 and the moving template 3, reduces production costs, and improves ease of use.

[0028] In this embodiment, the moving template 3 has two separately arranged elongated plates 4 on its side wall facing the fixed plate 2. The fixed ends of the elongated plates 4 are vertically fixed to the moving template 3, and the movable ends are movably passed through the through holes 5. In use, the moving template 3 moves under force and moves towards the fixed template 9. When the moving template 3 moves into position and the mold assembly is assembled to form the mold cavity, the elongated plates 4 move into position synchronously with the moving template 3. The brake assembly is activated and clamps the elongated plates 4, so that the relative position of the elongated plates 4 and the fixed plate 2 is fixed. Since the relative position between the fixed plate 2 and the fixed template 9 is fixed, the moving template 3 is fixed in relative position with the fixed template 9 through the fixed plate 2. This ensures that the mold cavity contour will not deform due to the relative offset between the moving template 3 and the fixed template 9, ensuring that the mold cavity contour remains constant during product processing and ensuring that the product quality meets the processing requirements.

[0029] In this embodiment, the template assembly includes a fixed plate 2 fixedly connected to the support 1, a movable template 3 that can move parallel to the fixed plate 2, and a fixed template 9 whose relative position is fixed to the fixed plate 2. The fixed plate 2 is provided with a driving component that drives the movable template 3 to reciprocate. The mold assembly includes mold plates respectively disposed on the facing surfaces of the movable template 3 and the fixed template 9. The movable template 3 moves toward the fixed template 9 under the drive of the driving component, causing the mold plates to abut against each other and enclose to form a mold cavity for processing plastic products. The fixed template 9 and the fixed plate 2 are fixed together by tie rods. There are four tie rods, which are placed between the corresponding corners of the fixed plate 2 and the fixed template 9 to ensure that the relative positions of the fixed template 9 and the fixed plate 2 are fixed and always remain parallel to each other. The movable template 3 always remains parallel to the fixed plate 2 when reciprocating. The long strip 4 extends in a direction perpendicular to the movable template 3 so that the long strip 4 passes through the perforation 5 and moves synchronously with the movable template 3. The long strip 4 moves synchronously with the moving template 3 and always passes through the perforation 5. When the moving template 3 is in place, the brake assembly is activated and tightly clamps the long strip 4. This ensures that the long strip 4 will shift radially along the perforation 5, ensuring that the moving template 3, the fixed template 9, and the fixed plate 2 are aligned with each other. It also ensures that the long strip 4 will shift axially along the perforation 5, ensuring that the moving template 3 and the fixed plate 2 remain parallel to each other. This, in turn, ensures that the moving template 3 and the fixed template 9 remain parallel to each other, ensuring that the mold cavity contour remains constant.

[0030] In this embodiment, the elongated plate 4 is a vertically oriented thin sheet extending perpendicular to the moving template 3, and the width of the elongated plate 4 is less than its height. Because the elongated plate 4 has a relatively large height, it can simultaneously cover the top and bottom of the moving template 3. Compared to existing structures, this reduces the number of threaded rods, simplifies the structure for easier disassembly and maintenance, and effectively reduces the size of the fixed plate 2 and the moving template 3, thereby lowering raw material costs and facilitating production, assembly, transfer, and operation.

[0031] In this embodiment, the ratio of the height of the elongated plate 4 to the height of the movable template 3 is A, where 0.75 ≥ A ≥ 0.5, to increase the coverage area of ​​the elongated plate 4 on the movable template 3. By increasing the height of the elongated plate 4, its coverage area on the movable template 3 is expanded, ensuring that all areas of the movable template 3 can be positioned by the elongated plate 4. Furthermore, by limiting the height of the elongated plate 4, the height of the perforation 5 is reduced, thereby ensuring that the overall structural strength of the fixing plate 2 meets the usage requirements. When A < 0.5, the long strip 4 cannot simultaneously cover the top and bottom of the moving template 3, causing the top and bottom of the moving template 3 to shift due to uneven force, resulting in the moving template 3 being unable to remain parallel with the fixed plate 2, and consequently causing the moving template 3 to deform due to its inability to remain parallel with the fixed template 9; when A > 0.75, the distance between the top wall of the perforation 5 and the top wall of the fixed plate 2, and between the bottom wall of the perforation 5 and the bottom wall of the fixed plate 2, is too small, causing the fixed plate 2 located above and below the perforation 5 to deform or even break due to increased force on both sides of the perforation 5, affecting the structural strength of the fixed plate 2.

[0032] In this embodiment, there are two elongated plates 4, which are vertically positioned on both sides of the movable template 3. Specifically, the fixed end of the elongated plate 4 is located at the center of the side of the movable template 3 facing the side wall of the fixed plate 2, so that the fixed part has the same height in the area above and below the perforation 5.

[0033] In this embodiment, the length of the elongated plate 4 is greater than the distance between the fixed plate 2 and the moving template 3. When the moving template 3 reciprocates, the elongated plate 4 is always inserted through the corresponding perforation 5. When the mold plates abut against each other and enclose to form a mold cavity, the distance between the moving template 3 and the fixed plate 2 reaches its maximum. At this time, the movable end of the elongated plate 4 is located at the perforation 5 and can be clamped with the brake assembly to ensure that the moving template 3 is fixedly positioned to the fixed plate 2 through the elongated plate 4.

[0034] In this embodiment, the clamping component includes two opposing clamping plates 6 arranged on both sides of the through hole 5 and a driving part for opening and closing the clamping plates 6. The driving part drives the clamping plates 6 to close and clamp the elongated plate 4 inserted in the through hole 5. The movable end of the elongated plate 4 and the corresponding facing surface of the clamping plate 6 are provided with teeth 7. When the mold assembly closes to form the mold cavity, the clamping plates 6 move closer together, causing the teeth 7 to engage, thereby limiting the displacement of the elongated plate 4. The elongated plate 4 cooperates with the clamping plate 6 by providing teeth 7 on its movable end. By increasing the length of the area where the teeth 7 are provided on the movable end of the elongated plate 4, it is possible to accommodate mold assemblies of different thicknesses, ensuring that the elongated plate 4 can be positioned with the clamping plate 6 through the engagement of the teeth 7 when the mold assembly closes, thus improving positioning reliability.

[0035] In this embodiment, the clamping plates 6 are two pieces and can be switched between opening and closing by the driving part. When the clamping plates 6 are in the open state, the gap between the clamping plates 6 corresponds to the through hole 5, which facilitates the insertion and movement of the long strip plate 4. When the clamping plates 6 are in the closed state, the clamping plates 6 clamp the long strip plate 4 and restrict the long strip plate 4 from moving along the through hole 5, ensuring that the relative position between the long strip plate 4 and the fixed plate 2 is fixed, and ensuring that the fixed template 9 and the moving template 3 can be fixed in relative position through the fixed plate 2.

[0036] In this embodiment, the support 1 is provided with guide rails 8, which guide the moving template 3 to reciprocate in a posture parallel to the fixed plate 2, so as to switch the mold assembly opening and closing. Multiple guide rails 8 are arranged parallel to each other, serving both to support the moving template 3, ensuring that the posture of the moving template 3 always remains parallel to the fixed template 9, and to guide the moving template 3 to move along a preset path, ensuring that the moving template 3 always remains parallel to the fixed template 9 during movement, and guaranteeing that the mold plates can accurately close and enclose to form the mold cavity.

[0037] Understandably, an air chamber is provided between the fixed end of the elongated plate 4 and the moving template 3. Adjusting the relative position between the moving template 3 and the elongated plate 4 using the air chamber to keep the moving template 3 parallel to the fixed plate 2 should also be considered a specific embodiment of this utility model. The air chamber can be inflated after the mold plates are closed, which can drive the moving template 3 and the fixed end of the elongated plate 4 to separate in opposite directions. The fixed end of the elongated plate 4 is fixed to the fixed plate 2 via a brake assembly. The air chamber at the movable end drives the moving template 3 towards the fixed template 9, thereby improving the mold cavity sealing.

[0038] Understandably, the mold clamping mechanism can be installed on an injection molding machine or blow molding machine as needed (e.g., Figure 3 As shown, any embodiment used to process plastic products should be considered a specific embodiment of this utility model.

[0039] Understandably, the template assembly may also include two parallel fixed plates 2 and two movable templates 3 that can move mirror images between the fixed plates 2. The mold assembly is disposed between the corresponding walls of the movable templates 3. The movable templates 3 achieve mirror image movement through a driving component. The brake assembly is disposed between the movable templates 3 and the corresponding fixed plates 2 to lock and position the movable templates 3 in place. This should also be considered a specific embodiment of the present invention.

[0040] Example 2:

[0041] Compared to Embodiment 1, this embodiment provides another mold closing mechanism.

[0042] like Figure 4The mold clamping mechanism shown has a reinforcing rib 11 in the middle of the perforation 5, which divides the perforation 5 into upper and lower power holes 10. The movable end of the elongated plate 4 includes two parallel forked rods 12, which pass through the corresponding power holes 10 and are clamped and positioned by the brake assembly. The perforation 5 is a vertically elongated strip, and the reinforcing ribs 11 are provided in the middle of the two side walls of the perforation 5, so that the perforation 5 is divided into two symmetrical power holes 10. The top and bottom of the movable end of the elongated plate 4 form independent and parallel forked rods 12, which can be inserted into the corresponding power holes 10. This ensures that the elongated plate 4 can move in conjunction with the template and cooperate with the brake assembly through the forked rods 12. It also reduces the size of individual holes by setting the reinforcing ribs 11, thereby improving the structural strength of the fixed plate and preventing the fixed plate from deforming under stress.

[0043] In this embodiment, the forked rod 12 is provided with teeth 8. The forked rods 12 on the same long strip plate 4 can share a set of brake assemblies, or independent brake assemblies can be set as needed. Both should be regarded as specific embodiments of this utility model.

[0044] In this embodiment, the reinforcing rib 11 and the fixing plate 2 are an integral structure (e.g., Figure 5 As shown in the figure, the unit hole 10 is formed by drilling a separate hole in the fixed plate 2.

[0045] The other structures and effects of the mold clamping mechanism described in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Claims

1. A mold closing mechanism with a long strip plate, comprising a support (1), a template assembly disposed within the support (1), and a mold assembly and a brake assembly disposed on the template assembly, wherein the template assembly reciprocates in opening and closing and, after driving the mold assembly to close and form a mold cavity, is locked by the brake assembly, characterized in that, The template assembly includes a fixed plate (2) fixed to the bracket (1) and a movable template (3) that can move parallel to the fixed plate (2). The fixed plate (2) has a through hole (5). The brake assembly includes a clamping member set at the through hole (5) and two long strips (4) placed on both sides of the movable template (3). The fixed end of the long strip (4) is vertically fixed to the movable template (3), and the movable end passes through the through hole (5) and is exposed. The clamping member clamps the long strip (4) when the movable template (3) moves into place to limit the displacement of the movable template (3).

2. The mold closing mechanism with a long strip plate according to claim 1, characterized in that, The moving template (3) remains parallel to the fixed plate (2) during reciprocating movement. The long strip (4) extends in a direction perpendicular to the moving template (3) so that the long strip (4) passes through the perforation (5) and moves synchronously with the moving template (3).

3. The mold closing mechanism with a long strip plate according to claim 2, characterized in that, The perforation (5) is divided into upper and lower unit holes (10) by the reinforcing rib (11) in the middle. The movable end of the long strip plate (4) includes two parallel bifurcated rods (12). The bifurcated rods (12) pass through the corresponding unit holes (10) and are clamped and positioned by the brake assembly.

4. A mold closing mechanism with a long strip plate according to claim 1, characterized in that, The long strip (4) is a vertically placed thin sheet extending perpendicular to the moving template (3), and the width of the long strip (4) is less than the height of the long strip (4).

5. A mold closing mechanism with a long strip plate according to claim 4, characterized in that, The ratio of the height of the long strip (4) to the height of the moving template (3) is A, 0.75≥A≥0.5, so as to increase the coverage area of ​​the long strip (4) on the moving template (3); or, the two long strips (4) are of equal height and are arranged parallel to each other; or, the fixed end of the long strip (4) is located at the center of the side of the moving template (3) facing the side wall of the fixed plate (2).

6. A mold closing mechanism with a long strip plate according to claim 1, characterized in that, The length of the long strip (4) is greater than the distance between the fixed plate (2) and the moving template (3). When the moving template (3) moves back and forth, the long strip (4) is always inserted in the corresponding perforation (5).

7. A mold closing mechanism with a long strip plate according to any one of claims 1-6, characterized in that, The clamping component includes two opposing clamping plates (6) arranged on both sides of the perforation (5) and a driving part for opening and closing the clamping plates (6). The driving part drives the clamping plates (6) to close and clamp the long strip plate (4) inserted in the perforation (5).

8. A mold closing mechanism with a long strip plate according to claim 7, characterized in that, The movable end of the long strip (4) and the facing surfaces of the corresponding clamping plate (6) are provided with teeth (7). When the mold assembly closes to form the mold cavity, the clamping plates (6) move closer to each other and the teeth (7) mesh accordingly to limit the deviation of the long strip (4).

9. A mold closing mechanism with a long strip plate according to any one of claims 1-6, characterized in that, The bracket (1) is provided with a guide rail (8), which guides the moving template (3) to reciprocate in a posture parallel to the fixed plate (2) so as to switch the mold assembly opening and closing.

10. A mold closing mechanism with a long strip plate according to any one of claims 1-6, characterized in that, An air chamber is provided between the fixed end of the long strip (4) and the moving template (3). The relative position between the moving template (3) and the long strip (4) is adjusted by the air chamber so that the moving template (3) and the fixed plate (2) remain parallel.

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