JP2013121643A - Sheet punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate accurately and easily the positions of a trimming die and a caul plate being opposed to each other across a resin sheet in a sheet punching device that punches out and trims the resin sheet formed into a molded article by the trimming die.SOLUTION: In the sheet punching device including: a lift drive mechanism 6 set up on a base frame 2; and a fixed frame 3 and a movable frame 4 disposed thereabove, which can trim the molded article by pressing the movable frame 4 supporting a trimming die with the resin sheet mounted on against the caul plate installed on the lower surface of the fixed frame 3, the fixed frame 3 and the movable frame 4 are supported by four poles 8 set upright on the base frame 2, and an upside of each of these poles 8 is formed to be a large diameter and a downside thereof is formed to be a small diameter on the basis of a top dead center of the movable frame 4 as a boundary.

Description

  The present invention relates to a sheet punching apparatus that trims a molded product from a resin sheet by placing a resin sheet, on which a molded product is formed by vacuum / pressure forming, between a die and a backing plate, and pressing a cutting blade of the die against the backing plate.

  Conventionally, a resin sheet on which a molded product is formed is placed between the mold and the pedestal, and the molded blade is trimmed from the resin sheet by pressing the cutting blade protruding from the mold against the polypropylene backing plate fixed to the pedestal. In the sheet punching device, the cutting edge of the punching blade is deeply cut into the backing plate to achieve a reliable trimming operation, which shortens the life of the backing plate and replaces it frequently. There was a need.

  In order to reduce the cost required for replacement of the contact plate, a mechanism for supporting the contact plate is provided on the pedestal so that the position of the contact plate on the surface of the pedestal changes irregularly. 2. Description of the Related Art A sheet punching device is known in which a contact plate can be used with a longer service life than a conventional one by changing the position of the plate and shifting the position where the punching blade presses (see, for example, Patent Document 1). .

  In addition, as a device for punching flat plates such as base paper, a movable frame that moves up and down by a toggle mechanism that bends and stretches via a crankshaft is arranged below a fixed frame with a die attached to the lower surface, and the flat plate is placed on the movable frame. In a known structure, the movable frame is lifted by a toggle mechanism and pressed against the lower surface of the fixed frame, so that the flat plate is punched out along the die (see, for example, Patent Documents 2 and 3).

JP 2002-113695 A JP 58-192793 A JP-A-4-256599

  The conventional sheet punching device that changes the position of the backing plate for each trimming operation by the support mechanism provided on the pedestal, the construction of the device becomes complicated and the cost of the device must be high. Since there is no change in the leading edge of the punching blade, the cutting blade is cut into the backing plate, so that powdery cutting residue is generated and easily adheres to the molded product. After removing the molded product from the device, the molded product A process of removing adhering cutting residue by blowing air on the surface is unavoidable.

When the punching blade is pressed against the backing plate by the punching operation, the resin sheet can be cut reliably with the punching blade, and the position of the backing plate and the punching blade is precisely adjusted so that the tip of the punching blade slightly touches the surface of the backing plate. If adjusted to the above, it becomes possible to use the contact plate for a long period of time without causing cutting waste.
However, unlike flat sheets made of fiber material that can be cut if the cutting blade is pushed into the wall at a depth of about 90% of the wall thickness, the resin sheet must be punched unless the wall thickness is completely divided by the cutting blade. When trimming a resin sheet formed by arranging a plurality of molded products arranged vertically and horizontally, it is possible to reliably trim all the molded products by penetrating the entire resin sheet by a punching operation. It is necessary to push the cutting blade into the depth.

The surface of the resin sheet is as long as the parallelism is maintained between the punching plate and the backing plate facing each other across the resin sheet at the top dead center position of the drive mechanism that moves the pedestal or the die up and down during the punching operation. The punching blade is pushed in with a uniform penetration depth as a whole, and all of the molded product is reliably trimmed, but in the first place, the thickness of the resin sheet on which the molded product is formed is as extremely thin as about 0.1 to 1 mm. Together, it is difficult to adjust the mounting position of both members so that the die is completely parallel to the backing plate in consideration of the position of the top dead center of the drive mechanism. It is not easy to finely adjust the punching height on the front, back, left, and right sides of the sheet. Adjustment as described above, which can reliably cut the resin sheet with the cutting blade, and the tip of the cutting blade slightly touches the surface of the backing plate, is long. Need time work and human know-how It must be said and poor feasibility me.
Therefore, the conventional punching device is set so that the cutting blade is pushed deeply into the backing plate, and it is necessary for consumption and replacement of the backing plate from the viewpoint of minimizing the depth of pushing into the backing plate. There is no technical idea to keep costs down.

On the other hand, recent facilities are required to save space and power. However, the sheet punching device that employs a toggle mechanism as a drive mechanism of the movable frame disposed below the fixed frame is provided on the lower side of the movable frame. Therefore, it can be said that it is preferable to realize the above-mentioned request because the toggle mechanism is accommodated in the apparatus and the apparatus configuration can be reduced in size.
However, when such a toggle mechanism is used, the mechanism must be precise and complicated in order to move the movable frame up and down while maintaining the level of the upper surface of the movable frame accurately.

  In other words, the toggle mechanism connects the eccentric shaft portion of the crankshaft connected to the drive shaft of the motor and the shaft portions of the link arms arranged on both sides of the crankshaft by the crank lever, and as the crankshaft rotates. Thus, it is configured to move the movable frame supported by the upper ends of both link arms up and down by folding or extending the link arms connected to both crank levers that move forward and backward to the side of the crankshaft. However, because there are many nodes of the power transmission mechanism from the motor drive shaft to the movable frame, it is difficult to bend or extend the two link arms that support the movable frame in perfect synchronization, and the movable frame can be smoothly moved with the naked eye. Even if it seems to move up and down, microscopically, depending on the bending and stretching movements of both link arms, there is a slight difference in extension, Moving frame moves up and down while tilting the top right or back and forth.

Of course, if the level of the upper surface of the movable frame is ensured at the position where the extraction blade installed on the movable frame hits the contact plate attached to the lower surface of the fixed frame, that is, the top dead center of the link arm that bends and stretches, Although it is possible to set the position of the contact plate and the extraction blade so that the depth of pressing into the contact plate of the extraction blade is reduced, the upper dead center of the link arm is reached while the extraction mold on the movable frame is inclined. The pressure when the extraction blade punches the resin sheet and hits the contact plate, that is, the cutting pressure becomes non-uniform, resulting in rapid wear damage of the extraction blade and the contact plate.
Therefore, when the movable frame is driven up and down using a toggle mechanism, in order to extend the service life of the contact plate and the extraction blade, the movable frame in which the extraction mold is installed on the lower surface of the fixed frame to which the contact plate is attached. It is necessary to take measures to operate so that the upper surface of the frame rises in parallel and the cutting blade presses against the contact plate at the top dead center of the link arm.

  In addition, the conventional sheet punching device is configured to move the movable frame up and down by moving the hydraulic cylinder up and down with a hydraulic motor or the like, or by continuously rotating the flywheel. Therefore, power consumption is large, and since the oil viscosity decreases and the internal pressure of the cylinder changes due to the temperature of the enclosed oil, it is difficult to precisely adjust the speed and lift position, and uneven punching There is a drawback that it is likely to occur. The device configuration must be large.

  In view of such problems of the prior art, the present invention provides a sheet punching apparatus for trimming a molded product by punching a resin sheet on which a molded product is formed, and a punching die placed opposite to the resin sheet. It is an object of the present invention to make it possible to accurately and easily adjust the position of the abutting plate and to perform a punching operation by precisely controlling the pushing depth, cutting pressure, and speed of the extraction blade with respect to the abutting plate. Another object of the present invention is to reduce the size and power of the sheet punching apparatus having the above function.

In order to solve the above-described problems, the present invention provides a lift drive mechanism having a toggle mechanism that bends and stretches via a crankshaft on the upper surface of a base frame, and a fixed frame and a movable frame are disposed above the lift mechanism. A molded frame is formed from the resin sheet by raising the movable frame that supports the formed mold on which the formed resin sheet is placed on the upper surface by an elevating drive mechanism, and pressing the extracted blade to a backing plate installed on the lower surface of the fixed frame. In the sheet punching device for trimming
Four circular cross-section pillars are erected on the upper surface of the base frame and around the toggle mechanism, and the fixed frame and the movable frame have four circular shaft hole portions provided in the respective peripheral portions. It is inserted between the columns and supported between the columns,
The fixed frame is attached by fixing the shaft hole portions to the support columns after adjusting the support height along the support columns by a support height adjusting mechanism provided above the fixed frame.
The movable frame is supported and attached so as to be slidable up and down along the support column in conjunction with the lifting operation of the lifting drive mechanism.
The external dimensions of each column in the portion of the movable frame that slides up and down in conjunction with the lifting and lowering operation of the lifting and lowering drive mechanism are slightly lower than the top dead center in the lifting and lowering operation area of the movable frame. The size of the gap between the outer peripheral surface of each column and the inner peripheral surface of the shaft hole of the movable frame is different with the position on the side as a boundary, and the gap is small in the portion above the boundary position, and the boundary position It has the structure set so that the said clearance gap may become large in the lower part.

The sheet punching device of the present invention is configured such that four circular struts are erected on a base frame, and the peripheral portions of the fixed frame and the movable frame that are vertically opposed to each other by these four struts are supported. ing.
The fixed frame and the movable frame are each attached to each column by fitting the shaft hole portion provided in the peripheral part to the outer periphery of each column, and the fixed frame and the movable frame are displaced vertically and slid along the column, It is possible to easily and accurately adjust the support height of both frames by appropriately adjusting the fitting position in each column. The fixed frame is fixed by attaching a fixing tool such as a nut to the support with the support in the state where the support is passed through the shaft hole of the periphery, but the fixing position of each of the four supports is adjusted. By doing so, it is possible to precisely adjust and set the height of the front, rear, left and right of the backing plate installed on the lower surface of the fixed frame.
The movable frame is moved up and down by a lifting drive mechanism having a toggle mechanism installed on the base frame, and in this case, the left and right or the front and rear of the upper surface of the movable frame that may be caused by the bending and stretching operation of the toggle mechanism. Since the movable frame is supported through the four pillars in the peripheral shaft hole, the amount of inclination is extremely small, and the movable frame can be smoothly slid up and down along each of the pillars. Can do.

Furthermore, the sheet punching device according to the present invention is configured such that the outer dimensions of the column in the portion facing the shaft hole portion of the movable frame are made different at a position slightly below the top dead center in the lifting / lowering operation region of the movable frame. The diameter of the gap between the inner peripheral surface of the shaft hole portion and the outer peripheral surface of the support column becomes smaller in the portion above the boundary position, and the gap becomes larger in the portion below the boundary position. The small diameter is set so as to be.
That is, the axis of the movable frame at a position slightly below the top dead center of the lifting operation area of the movable frame that is moved up and down by the lifting drive mechanism, that is, a position slightly below the highest reaching point of the rising movable frame. The portion where the hole is in contact with the column is defined as a boundary position, and the column is formed by setting the column outer dimension above the boundary position to a large diameter and the column dimension below the column to a small diameter to form the column. When the movable frame is raised from the bottom dead center of the operating area, the gap between the inner peripheral surface of the shaft hole and the outer peripheral surface of the column is large below the boundary position, and the contact resistance between both members is small, so the movable frame is smooth. When the shaft hole part rises to the boundary position, the clearance between the inner peripheral surface of the shaft hole part and the outer peripheral surface of the column becomes small, and the contact resistance between both members increases. , Periphery The movable frame supported by the four pillars through the shaft hole is horizontally oriented so that the movable frame is corrected in the horizontal direction, and the top dead center of the lifting operation area, that is, the upper surface of the movable frame It is possible to raise the movable frame while maintaining the above posture until the tip of the cutting blade of the die is in contact with the contact plate on the lower surface of the fixed frame.
With this configuration, when the resin frame is placed on the die and the movable frame is raised, the gap between the inner peripheral surface of the shaft hole and the outer peripheral surface of the column is large at the position where the shaft hole of the movable frame faces the small diameter portion of the column. When the tilting of the upper surface of the movable frame occurs with the bending / extending operation of the toggle mechanism, the tilting mechanism moves upward while absorbing the tilt, that is, tilting the upper surface of the movable frame as appropriate. When the movable frame rises to a position where the shaft hole portion faces the large diameter portion of the support column, the gap between the inner peripheral surface of the shaft hole portion and the outer periphery surface of the support column is small, and there are four shaft hole portions on the periphery of the movable frame. The movable frame supported by each column is oriented so that its upper surface is horizontal, and the movable frame remains as it is until it reaches the top dead center of its lifting and lowering operation area. The tip of the punching die is pressed with the same cutting pressure across the entire resin sheet at the top dead center, and the tip of the punching blade comes into contact with the contact plate installed on the lower surface of the fixed frame. And cut the resin sheet.

According to this, since the movable frame can be held horizontally and can be raised to a position where it is pressed against the lower surface of the fixed frame, the cutting blade on the upper surface of the movable frame can be brought into contact with the resin sheet. The resin sheet is cut by being pressed against the entire surface of the plate with equal pressure, effectively preventing part of the tip of the extraction blade from being biased and hitting the contact plate, and extending the service life of the contact plate and the extraction blade. Can do.
In addition, the movable frame is supported by four pillars through the shaft hole part in the periphery thereof, and the increase in contact resistance due to the shaft hole part that rises in each pillar reaches the boundary position. In order to prevent further raising of the part, the shaft hole parts of the peripheral part of the movable frame are aligned at the same height at the boundary position of each column, and even if the movable frame is inclined, Posture can be corrected.
Note that the outer shape of the strut boundary position has an appropriate length between the lower end of the large-diameter portion and the upper end of the small-diameter portion so that the shaft hole fitted to the outer periphery slides smoothly even at the boundary portion. It is preferable to provide the outer dimensions so that the outer dimensions are gradually reduced.

  Furthermore, in the sheet punching device having the above-described configuration, the present invention is configured to trim a molded product, in a state where a fixed frame is first raised to a position at an appropriate height along a support by a support height adjusting and adjusting mechanism. The movable frame supported by the upper surface is lifted by the lifting drive mechanism and held at the highest lift reaching position, and then the fixed frame is fixed by the support height adjusting mechanism. The resin sheet is lowered to a position where it comes into contact with the blade, the fixed frame is temporarily fixed at the contact position, and the resin frame to be trimmed to the die is installed by lowering the movable frame, and then the movable frame is moved up and down to move the resin sheet After that, adjust the fixing position with each post inserted into each circular shaft hole around the fixed frame that was temporarily fixed. Above, by the to the fixed fastened to each shaft hole in fasteners in posts fixed position of the fixed frame when punching operation is characterized in that it is configured to be adjusted.

According to the sheet punching device having the above configuration, in adjusting the overlapping position of the fixed frame and the movable frame before the punching operation, first, in a state where the movable frame that supports the punching die on the upper surface is held at the highest ascent position. The fixed frame is lowered from above, and the fixed frame is set at a position where the contact plate comes into contact with the extraction blade of the extraction die. At this time, check the degree of contact of the cutting blade against the backing plate, adjust the support height of the fixed frame with the support height adjustment mechanism so that the cutting blade hits the entire backing plate evenly, and support height at the adjustment position. Stop the adjustment mechanism and temporarily fix the fixed frame.
Next, with the resin sheet placed on the punching die, the movable frame is moved up and down to perform trial punching, confirm the trimming state of the molded product, and prevent the punching unevenness from occurring in the entire resin sheet. Adjust the fixing position of the fixed frame at, that is, adjust the height of front, back, left and right of the backing plate installed on the lower surface of the fixed frame precisely, and fix each axial hole around the fixed frame to each support column at the adjusted position. Then, the fixed frame is permanently fixed.
In this way, by adjusting the fixed position of the fixed frame so as to be along the highest rising position of the movable frame, both frames can be overlapped in parallel at the position where the upper surface of the movable frame contacts the lower surface of the fixed frame. Thus, the resin sheet can be cut by pressing the punching blade on the upper surface of the movable frame against the entire surface of the resin sheet and the backing plate with equal pressure. Even if the movable frame does not rise horizontally due to the habit of the device, even if it is slightly tilted at its highest rise position, the fixed position of the fixed frame is adjusted along the tilted movable frame, that is, the fixed frame By tilting and fixing along the movable frame, the parallelism of both frames at the trimming position is ensured precisely, and this allows the cutting blade to be pressed against the entire surface of the resin sheet and the backing plate with equal pressure It becomes possible.
In addition, the resin sheet is stretched when the molded product is molded, and the thickness is different in the central part and the peripheral part of the sheet, but the distribution of the thickness of the entire resin sheet varies depending on the trimming situation at the time of trial punching. By taking into account the adjustment of the fixing position of each support of the fixed frame, the cutting blade can be securely cut into the entire resin sheet with different thicknesses without pushing the cutting blade into the resin sheet more than necessary. Trimming can effectively prevent the tip of the extraction blade from being biased and hitting the contact plate.

The sheet punching device having the above configuration preferably includes a servo motor as a drive source of the elevating drive mechanism.
By driving the toggle mechanism with a servo motor, it is possible to adjust the speed and torque when the movable frame is moved up and down to precisely set the cutting pressure and speed. In addition, the apparatus is compactly configured by being installed on the base frame together with the toggle mechanism, and the power consumption can be reduced, which is preferable in terms of power saving.
Furthermore, it is preferable to have a configuration provided with a pallet table for transferring the punching die from outside the operating region of the movable frame to the upper surface of the movable frame.

1 is an external view of a sheet punching apparatus according to an embodiment of the present invention. It is the front view which permeate | transmitted and showed the principal part of the sheet | seat punching apparatus of FIG. It is the side view which permeate | transmitted and fractured | ruptured and showed the principal part of the sheet | seat punching apparatus of FIG. It is the top view which permeate | transmitted and showed the principal part of the sheet | seat punching apparatus of FIG. It is the top view (A) of a fixed frame, and sectional drawing along the VV line. It is sectional drawing along the top view (A) and VI-VI line of a movable frame. It is the top view which permeate | transmitted and showed the principal part of the raising / lowering drive mechanism part. FIG. 8 is a cross-sectional configuration diagram of a main part of a toggle mechanism that constitutes the lifting drive mechanism of FIG. 7. It is a top view which permeate | transmits and shows the principal part of a pallet table part. It is the figure which showed the attachment position of a base frame, a movable frame, a fixed frame, and an upper frame along the support | pillar. It is the figure which expanded and showed the boundary part from which the external dimension of a support | pillar differs, (A) is the state which lowered | hung the movable frame, (B) is the state which raised the movable frame to the top dead center. It is sectional drawing of the die plate supported by the upper surface of a movable frame, a resin sheet, and the contact plate fixed to the fixed frame lower surface, (A) is the figure which showed arrangement | positioning before resin sheet cutting, (B) is a movable frame. It is the figure which showed the state which raised and cut | judged the resin sheet.

A preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows the appearance of a sheet punching apparatus according to an embodiment of the present invention. In this sheet punching apparatus 1, four columns 8 having a circular cross section are erected on the upper surface of a base frame 2. A fixed frame 3 and a movable frame 4 that are vertically opposed to each other are supported on the peripheral surface, an upper frame 5 is attached to the upper end of the support column 8, and a toggle mechanism that is installed on the upper surface of the base frame 2 is provided. The movable frame 4 is supported by the lift drive mechanism 6 so as to be movable up and down, and a pallet table 7 for transferring the table 71 onto the movable frame 5 is disposed in front of the apparatus. A resin sheet S on which a plurality of molded products Sf are formed is placed on the upper surface of the die D attached to the upper surface, and the table 71 is transferred onto the movable frame 4 to In addition, the movable frame 4 is raised by the elevating drive mechanism 6 in a state where the die D and the resin sheet S are supported on the upper surface of the movable frame 4, and the punching blade De of the die D is installed on the lower surface of the fixed frame 3. By pressing against the plate B, the molded product Sf is trimmed from the resin sheet S (see FIG. 12 for the arrangement of the contact plate B, the die D and the molded product Sf). In addition, the number 10 in FIG. 1 is an operation panel.

  More specifically, as shown in FIGS. 2 to 4, an elevating drive mechanism 6, which will be described later, is installed on the upper surface of the base frame 2. Cylindrical column fixing portions 21 are provided at equal intervals on the left and right sides, and the lower ends of the columns 8 are respectively fitted to the column fixing portions 21 so that the four columns 8 are mounted on the upper surface of the base frame 2. Stands vertically.

As shown in FIG. 5, the fixed frame 3 has a plurality of branch plates 32 spanned between frame members 31 and 31 having an appropriate height and width, and an upper plate 33 and a lower plate above and below each branch plate 32. 34 are overlapped, and the joint portions of these members are integrally formed by welding. In both front and rear portions of the frame members 31, 31 are formed shaft hole portions 35 that are hollow portions having a vertically long circular cross section that penetrate between the upper and lower surfaces of the frame member 31. In addition, the lower surface of the lower plate 34 is a contact plate fixing portion 34a that supports the contact plate B, and the contact plate B is fixed at a predetermined position of the fixing portion 34a.
The fixed frame 3 is supported on the base frame 2 through the pillars 8 through the shaft holes 35 and is displaced up and down along the pillars 8 by a lifting cylinder 9 which is a support height adjusting mechanism described later. After the adjustment, each shaft hole 35 is fixedly attached to each column 8 by fastening a fixing tool (not shown) such as a nut to the column 8 in each shaft hole 35. The fixed positions of the shaft hole portions 35 around the fixed frame 3 and the four support columns 8 are adjustable, and the fixed frame 3 can be adjusted by appropriately setting the fixed positions of the support columns 8. It is provided so that the height of the front, rear, left and right of the backing plate B installed on the lower surface of the can be adjusted and set precisely.

As shown in FIG. 6, the movable frame 4 bridges a plurality of branch plates 42 having recesses 41 c and 41 c at a lower portion between frame members 41 and 41 having appropriate heights and widths. An upper plate 43 is overlaid on the upper portion of 42, and a connecting plate 44 is fitted over and inserted into a recess 41c of each branch plate 42, and the joint portions of these members are formed by welding and integration.
As in the case of the fixed frame 3, shaft hole portions 45, which are vertically long circular cross-section hollow portions, are formed in both front and rear portions of the frame members 41, 41. Further, the branch plate 42 has a flat portion 42a at the center thereof, and both leg portions 42b bent downward are connected to both sides of the flat portion 42a, and ends of both leg portions 42b are fixed to the frame member 41. . The upper plate 43 is attached to a position higher than the frame members 41, 41 with its lower surface fixed to the flat portion 42a of each branch plate 42, and is a table transferred from a pallet table 7 described later on its upper surface. 71 is supported. In addition, the upper ends of link arms 613 and 613 of the lifting drive mechanism 6 described later are joined to the recesses 41c and 41c of the branch plates 42 into which the connecting plate 44 is fitted.
The movable frame 4 is disposed opposite to the lower side of the fixed frame 3 through the pillars 8 through the shaft holes 45 and is installed on the base frame 2 in the recesses 41c and 41c of the branch plates 42, which will be described later. The upper ends of the link arms 613 and 613 of the mechanism 6 are connected and supported on the lift drive mechanism 6, and are slid up and down along the support column 8 in conjunction with the lift operation of the lift drive mechanism 6. It is attached so that it can be displaced.

  As shown in FIG. 4, the upper frame 5 is formed by bridging a plurality of branch frames 52 between the frame bodies 51, 51 and welding and integrating the joint portions of the respective members, and is fixed to the upper end of the column 8. It is. Between the branch frames 52, 52 arranged at the center of the upper frame 5, an elevating cylinder 9 with an operating shaft 91 facing downward is integrally attached. The end of the operating shaft 91 of the elevating cylinder 9 is connected to the upper plate 33 of the fixed frame 3, and the height of the fixed frame 3 is raised and lowered along the column 8 by the elevating operation of the operating shaft 91. It can be displaced.

As shown in FIGS. 7 and 8, the elevating drive mechanism 6 includes a toggle mechanism 61 that is disposed below the movable frame 4 and supports the movable frame 3 so as to be movable up and down, and a servo motor 62 that drives the toggle mechanism 61. Configured.
More specifically, the drive shaft of the servo motor 62 is connected to the input shaft of the speed reducer 64 via the pulley 63, and the output shaft of the speed reducer 64 is connected to the chain coupling 65. The toggle mechanism 61 connects the crankshaft 611 to the output shaft of the chain coupling 65, connects one end of the crank levers 612 and 612 to the eccentric shaft portions 611a and 611b of the crankshaft 611, and crank levers 612 and 612. The other end is connected to shaft portions 613a of link arms 613 and 613 disposed on both sides of the crankshaft 611, respectively. Both link arms 613 and 613 have their lower ends fixed to the base frame 2 with the shaft portion 613a interposed therebetween, and their upper ends are fitted and connected to the recesses 41c and 41c of the movable frame 4, respectively.
The elevating drive mechanism 6 inputs the drive output of the servo motor 62 to the toggle mechanism 61 via the speed reducer 64 and the chain coupling 65 to rotate the crankshaft 611. As the crankshaft 611 rotates, The link arms 613 and 613 connected to the crank levers 612 and 612 moving forward and backward to the side of the shaft 611 are folded or extended vertically, so that the movable frame is supported by the upper ends of the link arms 613 and 613. 4 is configured to move up and down along the column 8.

As shown in FIG. 9, the pallet table 7 is formed by horizontally projecting the left and right end portions of the table 71 to which the die D supporting the resin sheet S is fixed on the upper surface to the front side of the sheet punching device 1. The motor is mounted and supported on the rails 72 and 72, and is slidably displaced along the rails 72 and 72 by a drive motor 73 installed on the lower side of the rails 72 and 72.
More specifically, the upper surface 71a of the table 71 serves as a die attachment surface for supporting the die D in a predetermined position and, as shown in FIG. 3 and FIG. A lever engagement guide 71b having a U-shaped cross section is provided. The rails 72, 72 have one end protruding forward of the sheet punching device 1 and the other end reaching the rear end of the device 1, and the movable frame 4 is lifted and lowered by the front lifting drive mechanism 6. It is horizontally attached to the left and right outer sides of the region and slightly higher than the upper surface of the upper plate 43 of the movable frame 4 when the movable frame 4 is at the bottom dead center of the lifting operation region. The drive motor 73 is attached to the lower side of the rails 72, 72 with the drive shaft 73a facing upward, and one end of a belt-like lever 74 is integrally connected to the drive shaft 73a, and the lever A shaft portion 74 a having an appropriate thickness that is bent upward in a key shape is fixed to the other end portion of 74, and this shaft portion 74 a is engaged with a lever engagement guide 71 b of the table 71.
When the drive motor 73 is driven, the pallet table 7 rotates the lever 74 integrally with the drive shaft 73a, and the shaft portion 74a provided at the end of the lever 74 slides within the lever engagement guide 71b while moving the table 71. The table 72 supported by the rails 72 and 72 is slid in the direction from the front end to the rear end of the rails 72 and 72 by pushing in the rotation direction. Then, the table 71 is arranged at the front ends of the rails 72 and 72, and the resin sheet S is placed on the die D fixed on the upper surface of the table 71, and the cut resin sheet S and the trimmed molded product Sf are taken out. In the state where the table 71 is moved and arranged at the rear end of the rails 72, 72, the table 71 is positioned on the raising / lowering operation region of the movable frame 4, and on the upper surface of the upper plate 43 of the movable frame 4 that rises. The movable frame 4 and the lower surface of the fixed frame 3 are moved up and down together with the movable frame 4.
The table 71 supported on the movable frame 4 is a process in which the movable frame 4 descends to its bottom dead center. 72 so as to be separated from the movable frame 4 and driven by the drive motor 73 so that the movable frame 4 can be slid to the front end side of the rails 72 and 72 outside the operation region from the up / down operation region of the movable frame 4. It has become.

As shown in FIG. 10, each of the four support columns 8 erected on the base frame 2 is fitted with the shaft hole portion 35 of the fixed frame 3 and the shaft hole portion 45 of the movable frame 4 on each peripheral surface. Although both frames are supported on the base frame 2, the outer dimensions of the fixed frame 3 at the position where the shaft hole 35 is inserted and the position where the shaft hole 45 of the movable frame 4 is inserted. Are different.
More specifically, as shown in FIG. 11, the highest point is the top dead center of the lifting operation area of the movable frame 4 that is moved up and down by the lifting drive mechanism 6 and the upper end of the shaft hole 45 is in contact with the column 8. Y, the outer diameter of the column 8 gradually decreases from a position Y1 slightly below the highest point Y, and the outer diameter of the column 8 below the position Y2 is smaller than the outer diameter φ1 at the position Y1. It is formed by setting φ2 (φ1> φ2).
Specifically, the inner diameters φf of the shaft hole portions 35 and 45 of the fixed frame 3 and the movable frame 4 are each 102 mm (φf = 102 mm), and the column above the Y1 to which the shaft hole portion 35 of the fixed frame 3 is fixed. 8 is set to 100 mm (φ1 = 100 mm), the outer diameter φ2 of the support column 8 below from the position Y2 is set to 98 mm (φ2 = 98 mm), and from the highest point Y of the support column 8 to the position Y1 The width X1 is set to 30 mm (X1 = 30 mm), and the width X2 is set to 20 mm (X2 = 20 mm) from the position Y1 where the outer diameter of the support column 8 gradually changes to the position Y2.
As described above, the portion where the shaft hole 45 of the movable frame 4 is in contact with the support column 8 at the position Y1 slightly lower than the top dead center Y of the lifting and lowering operation region of the movable frame 4 is defined as the boundary position, and the position higher than the boundary position. The movable frame 4 is lifted from the bottom dead center of the lifting operation region by forming the column 8 by setting the outer dimension of the column 8 to the large diameter φ1 and the outer dimension of the lower column 8 to the small diameter φ2. In this case, the gap between the inner peripheral surface of the shaft hole 45 and the outer peripheral surface of the support column 8 is large below the boundary position, and the contact resistance between the two members is small, so that the movable frame 4 rises smoothly, and the shaft hole portion When 45 rises to the boundary position, the clearance between the inner peripheral surface of the shaft hole portion 45 and the outer peripheral surface of the support column 8 becomes smaller, and the contact resistance between both members increases, and the contact resistance between the support column 8 and the shaft hole portion 45 increases. So that the movable frame 4 is oriented horizontally Works. As a result, the top dead center of the lifting operation region, that is, the tip of the cutting blade De of the cutting die D supported by sandwiching the table 71 on the upper surface of the movable frame 4 is applied to the contact plate B attached to the lower surface of the fixed frame 3. The movable frame 4 is lifted while maintaining the posture until the contact position.

  The drive devices such as the servo motor 62, the speed reducer 64, the chain coupling 65, the drive motor 73, and the elevating cylinder 9 that displace the fixed frame 3, the movable frame 4, and the table 71 are arranged on the operation panel 10. The operation is controlled on the basis of the installation value input from.

The sheet punching apparatus 1 of this embodiment configured as described above adjusts the overlapping position of the fixed frame 3 and the movable frame 4 as follows before the punching operation for trimming the molded product.
First, with the fixed frame 3 raised to an appropriate height along the support column 8 by the lifting cylinder 9, the movable frame 4 supporting the die D on the upper surface is lifted by the lifting drive mechanism 6 to reach the highest rise. Hold in position.
Next, the fixed frame 3 is lowered by the elevating cylinder 9 to a position where the contact plate B installed on the lower surface of the fixed frame 3 comes into contact with the extraction blade De of the extraction die D, and the fixed frame 3 is set at the contact position. At this time, the degree of contact of the extraction blade De against the backing plate B is confirmed, and the support height of the fixed frame 3 is adjusted by the elevating cylinder 9 so that the extraction blade De uniformly hits the entire backing plate B. After the adjustment, the elevating cylinder 9 is stopped and the fixed frame 3 is temporarily fixed.
Next, after the movable frame 4 is lowered and the resin sheet S to be trimmed to the die D is installed, the movable frame 4 is moved up and down by the lift drive mechanism 6 to perform the trial punching of the resin sheet S. At this time, the trimming state of the trial punched molded product is confirmed, and the fixing position of the fixed frame 3 in each of the four support columns 8 is adjusted so that punching unevenness does not occur in the entire resin sheet S. The heights of the front, rear, left and right are precisely adjusted, and the shaft hole portions 35 around the fixed frame 3 are fixed to the support columns 8 at the adjustment position, respectively, and the fixed frame 3 is permanently fixed.

If the overlapping position of the fixed frame and the movable frame is adjusted, the resin sheet S is punched by the following operation process.
First, in a state where the table 71 of the pallet table 7 is moved to the front of the apparatus 1, the resin sheet S on which the molded product Sf is formed is placed on the die D fixed on the upper surface of the table 71, and the table 71 is transferred onto the raising / lowering operation area of the movable frame 4.
Next, the movable frame 4 is lifted by the lift drive mechanism 6, and as shown in FIG. 12A, the table 71 is placed on and supported by the upper surface of the movable frame 4 in the process of rising, and the movable frame 4 is When sliding from the position Y2 which is the boundary position of the support column 8 to the position Y1, the posture is corrected horizontally.
At the top dead center of the lifting / lowering operation area of the movable frame 4, the tip of the cutting blade De of the cutting die D is pressed against the entire resin sheet S with an equal cutting pressure as shown in FIG. The tip of the extraction blade De abuts against a contact plate B fixed to the lower surface of the fixed frame 3.
The movable frame 4 that has reached the top dead center is then lowered, and in the process of descending to the bottom dead center, the table 71 is supported by the rails 72 and 72 and separated from the movable frame 4, and the table 71 is placed in front of the apparatus 1. The punching process is completed by moving and removing the cut resin sheet S and the trimmed molded product Sf from the die D. The above operation is automatically performed by a program input to the operation panel 10.

  The illustrated structure of the sheet punching device 1 and the structure of each part constituting the same show an example of an embodiment of the present invention. The present invention is not limited to this, and the size of the resin sheet to be punched It can be configured in an appropriate form depending on the shape and the like. Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiment generated by the combination has the effects of the combined embodiment and the modified examples. The backing plate can be made of a synthetic resin such as polypropylene, polyethylene, or vinyl chloride, a metal such as stainless steel or aluminum, or any other appropriate material.

DESCRIPTION OF SYMBOLS 1 Sheet punching device, 2 Base frame, 3 Fixed frame, 35 Shaft hole part, 4 Movable frame, 45 Shaft hole part, 5 Upper frame, 6 Lifting drive mechanism, 7 Pallet table, 8 support | pillar, 9 Lifting cylinder, 10 Control panel , S resin sheet, Sf molded product, B backing plate, D punching die, De punching blade

Claims (4)

An elevating drive mechanism having a toggle mechanism that bends and stretches via a crankshaft is installed on the upper surface of the base frame, and a fixed frame and a movable frame are arranged above it, and a mold with a resin sheet on which a molded product is formed is placed. In the sheet punching device for trimming the molded product from the resin sheet by raising the movable frame supported on the upper surface by the lifting drive mechanism and pressing the punching blade of the mold against the backing plate installed on the lower surface of the fixed frame,
Four circular cross-section pillars are erected on the upper surface of the base frame and around the toggle mechanism, and the fixed frame and the movable frame have four circular shaft hole portions provided in the respective peripheral portions. It is inserted between the columns and supported between the columns,
The fixed frame is attached by fixing the shaft hole portions to the support columns after adjusting the support height along the support columns by a support height adjusting mechanism provided above the fixed frame.
The movable frame is supported and attached so as to be slidable up and down along the support column in conjunction with the lifting operation of the lifting drive mechanism.
The external dimensions of each column in the portion of the movable frame that slides up and down in conjunction with the lifting and lowering operation of the lifting and lowering drive mechanism are slightly lower than the top dead center in the lifting and lowering operation area of the movable frame. The size of the gap between the outer peripheral surface of each column and the inner peripheral surface of the shaft hole of the movable frame is different with the position on the side as a boundary, and the gap is small in the portion above the boundary position, and the boundary position A sheet punching device having a configuration in which the gap is set to be larger in a lower portion than the lower portion. When trimming the molded product, first, the fixed frame is raised to the appropriate height along the support column by the support height adjustment mechanism, and then the movable frame that supports the die on the upper surface is raised by the lifting drive mechanism. Hold it in the highest position
Then, the fixed frame is lowered by the support height adjusting mechanism to a position where the contact plate installed on the lower surface of the fixed frame comes into contact with the punching blade of the upper surface of the movable frame, and the fixed frame is temporarily fixed at the contact position.
Next, after lowering the movable frame and installing a resin sheet to be trimmed into the mold, the movable frame is moved up and down to perform a test punching of the resin sheet,
Then, after adjusting the fixing position with each column that is inserted into each circular shaft hole around the fixed frame that has been temporarily fixed, the shaft hole is fixed to the column with a fixing tool and finally fixed. The sheet punching device according to claim 1, wherein the fixing position of the fixed frame when the punching operation is performed is adjusted.   The sheet punching device according to claim 1, wherein the sheet punching device has a configuration in which a servo motor is provided as a drive source of the elevating drive mechanism. The sheet punching device according to any one of claims 1 to 3, further comprising a pallet table for transferring the punching die from outside the lifting operation area of the movable frame to the upper surface of the movable frame.

Images