JP7005065B1 - Resin molded sheet cutting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded sheet cutting device capable of reducing or avoiding cracking and generation of chips with a simple structure when cutting a resin molded sheet having a plurality of heat-molded resin molded products to a predetermined length. .. SOLUTION: A cutting groove in which a cutting edge is inserted by abutting with a cutter 1 having a cutting edge 11 formed in a wedge shape and a resin molding sheet J having a plurality of resin molded products JS arranged and heat-molded facing the cutter. 22 is a resin molded sheet cutting device 10 including a pedestal 2 formed in the sheet width direction, and a cutter cutting a resin molded sheet in contact with the pedestal at a position of a cutting groove to a predetermined length. A heating device 3 for heating the pedestal is provided in the vicinity of the pedestal or the pedestal, and the resin molded sheet is sandwiched between the pedestal and the pedestal at a position facing the pedestal with the cutting line SL of the cutter sandwiched. A holding table 4 was provided. [Selection diagram] Fig. 4B

Description

The present invention relates to a resin-molded sheet cutting device, and more particularly to a resin-molded sheet cutting device that cuts a resin-molded sheet having a plurality of heat-molded resin-molded products to a predetermined length.

Generally, in a resin molded product used for a food tray or the like, a thermoplastic resin sheet wound in a coil shape is rewound, and the rewound resin sheet is heated with a heater or the like to be softened. After that, it is molded into a predetermined shape (hereinafter, also referred to as "heat molding") with a mold capable of vacuum forming or pressure forming. Heat molding of this resin molded product requires a sheet heating process, a molding process, etc., and a certain amount of production time (cycle time) is required. Therefore, in order to improve productivity, a plurality of resin molded products are molded at one time. Possible molds are often used.

In this case, it is possible to continuously cut the outer peripheral edge of each resin molded product following the heat molding, but the cutting device becomes large and the equipment cost tends to increase. Therefore, a resin-molded sheet having a plurality of heat-molded resin-molded products is cut to a predetermined length using a resin-molded sheet cutting device that cuts the resin-molded sheet in the sheet width direction, and the cut resin-molded sheet is cut. Once stacked and stored, the outer peripheral edge of each resin molded product is cut with a tandem cutting device that cuts individually in a laminated state or in a state where each piece is peeled off, and resin molding as a product. A method of forming an article may be adopted.

For example, Patent Document 1 discloses a resin-molded sheet cutting device that cuts a resin-molded sheet having a plurality of heat-molded resin-molded products to a predetermined length. Specifically, as shown in FIG. 9, a heater 102 that heats the thermoplastic resin sheet 101, a mold 103 that is formed by closely adhering the softened resin sheet 101 that is heated by the heater 102, and a mold. A thermoforming machine 100 including a fixed-size cutting machine (resin-molded sheet cutting device) 104 that cuts the resin-molded sheet 101a molded by 103 into a predetermined size is disclosed. Here, the sizing machine 104 has a wedge-shaped cutter 104a for cutting the resin molded sheet 101a, and the cutter 104a is lowered to obtain a resin molded sheet 101a having a plurality of heat-molded resin molded products 101b. Cut to the specified length. The sizing machine 104 is provided with a pedestal 104b at which the resin molded sheet 101a is brought into contact with the cutter 104a at a position facing the cutter 104a along the sheet width direction.

Japanese Unexamined Patent Publication No. 2001-293774

However, the sizing machine (resin molded sheet cutting device) 104 disclosed in Patent Document 1 has a configuration in which the wedge-shaped cutter 104a descends to cut the resin molded sheet 101a in contact with the cradle 104b. Therefore, as shown in FIG. 10, when the cutting edge 104a1 of the cutter 104a bites into the cutter side (upper end portion) 101a1 of the resin molding sheet 101a, the anti-cutter side (lower end portion) 101a2 of the resin molding sheet 101a is the cutter 104a. It is spread in the horizontal direction perpendicular to the cutting line, making it easier to break.

That is, the pressing force P1 of the wedge-shaped cutter 104a against the resin-molded sheet 101a at the time of cutting cuts while crushing the cutter side (upper end) 101a1 of the resin-molded sheet 101a in which the cutting edge 104a1 bites in advance. Via the pressing force P2 that pushes diagonally outward, the cutting edge 104a1 acts as a tensile force P3 that expands the anti-cutter side (lower end portion) 101a2 of the resin molded sheet 101a that bites into the resin molding sheet 101a in the horizontal direction.

By this tensile force P3, the anti-cutter side (lower end) 101a2 of the resin molded sheet 101a is stretched in the horizontal direction orthogonal to the cutting line, and when the elongation limit is reached, the anti-cutter side of the resin molded sheet 101a is reached. (Lower end) 101a2 breaks. Then, when the anti-cutter side (lower end portion) 101a2 of the resin molded sheet 101a is broken, cracks and minute chips are generated from the fracture surface 101a3. The cracks may reach the resin molded product 101b, and the chips may adhere to the resin molded product 101b. As a result, there may be problems such as disposal of the cracked resin molded product 101b, damage to the resin molded product 101b due to chips, and a decrease in productivity due to cleaning and removal of the chips.

The present invention has been made to solve such a problem, and when a resin molded sheet having a plurality of heat-molded resin molded products is cut to a predetermined length, it has a simple structure to prevent cracks and chips. It is an object of the present invention to provide a resin molded sheet cutting apparatus capable of reducing or avoiding the occurrence.

In order to achieve the above object, the resin molded sheet cutting apparatus according to the present invention has the following configurations.
(1) The sheet width is a cutting groove in which the cutting edge is inserted into contact with a cutter having a wedge-shaped cutting edge and a resin molded sheet having a plurality of heat-molded resin molded products arranged opposite to the cutter. A resin-molded sheet cutting device having a pedestal formed in a direction and the cutter cutting the resin-molded sheet in contact with the pedestal at a position of the cutting groove to a predetermined length.
A heating device for heating the pedestal is provided in the vicinity of the pedestal or the pedestal.
At a position facing the pedestal, a holding pedestal for sandwiching the resin molded sheet with the pedestal across the cutting line of the cutter is provided.

In the present invention, a heating device for heating the pedestal is provided in the vicinity of the pedestal or the pedestal, and the resin molded sheet is sandwiched between the pedestal and the pedestal at a position facing the pedestal. Since the holding table is provided, the temperature of the pedestal heated by the heating device can be raised to a temperature higher than the temperature of the holding table in which the amount of heat transferred from the pedestal is dissipated to a certain extent. Therefore, when cutting a resin-molded sheet having a plurality of heat-molded resin-molded products to a predetermined length, the pedestal is formed from the cutter side of the resin-molded sheet, which comes into contact with the holding table and the cutting edge of the cutter bites in advance. The anti-cutter side of the resin molded sheet that abuts and the cutting edge of the cutter bites in with a delay can be heated more along the cutting line of the cutter. Therefore, while suppressing the sagging due to excessive softening of the cutter side of the resin molded sheet that the cutting edge of the cutter bites in first, the anti-cutter side of the resin molding sheet that the cutting edge of the cutter bites in later is more along the cutting line. It can be softened a lot and the elongation limit leading to breakage can be improved.

Further, at the position facing the pedestal, a holding table for sandwiching the resin molded sheet between the cradle and the cutting line of the cutter is provided, so that when the cutter cuts the resin molded sheet, the pedestal and the pedestal are provided. The holding table can restrain the resin molded sheet along the cutting line. Therefore, when the cutting edge of the cutter formed in a wedge shape bites into the cutter side of the resin molded sheet, the cutting edge of the cutter is delayed and bites into the resin molded sheet. The force can be canceled by the binding force (friction force) in which the pedestal and the holding table restrain the resin molded sheet along the cutting line.

Therefore, when the cutting edge of the cutter bites into the cutter side of the resin molded sheet while softening the anti-cutter side of the resin molded sheet along the cutting line and improving the elongation limit leading to breakage, the anti-cutter side of the resin molded sheet is pressed. By canceling the tensile force that expands in the horizontal direction, it is possible to delay or avoid the breakage of the resin molded sheet on the non-cutter side. As a result, when a resin molded sheet having a plurality of heat-molded resin molded products is cut to a predetermined length, it is possible to reduce or avoid the generation of cracks and chips due to the breakage of the resin molded sheet on the anti-cutter side.

Therefore, according to the present invention, when a resin molded sheet having a plurality of heat-molded resin molded products is cut to a predetermined length, the resin molded sheet can reduce or avoid the generation of cracks and chips with a simple structure. A cutting device can be provided.

(2) In the resin molded sheet cutting apparatus described in (1),
The pedestal is provided with a support frame member in which a widening portion for supporting the abutting portion abutting on the resin molded sheet is formed at least within the range of the sheet width.
At both ends of the support frame member, the holding position where the pedestal is close to the holding table to hold the resin molded sheet and the pedestal are separated from the holding table to pass the resin molded sheet. It is characterized in that an elevating device for moving the cradle up and down is connected to the open position.

In the present invention, the pedestal is provided with a support frame member in which a widening portion for supporting the abutting portion abutting on the resin molded sheet is formed at least within the range of the sheet width, and the pedestal is provided at both ends of the support frame member. An elevating device that moves the pedestal up and down is connected between the holding position where the pedestal holds the resin molded sheet close to the holding pedestal and the open position where the pedestal is separated from the holding pedestal and passes the resin molded sheet. Therefore, in order to cut the resin molded sheet, the elevating device operates, and when the pedestal holds the resin molded sheet close to the holding table, the bending of the contact portion that comes into contact with the resin molded sheet in the pedestal. The amount can be reduced by the rigidity of the widened portion formed at least in the range of the seat width. Therefore, the pedestal and the holding table can restrain the resin molded sheet substantially uniformly along the cutting line, and can more stably reduce or avoid the generation of cracks and chips during cutting.

(3) In the resin molded sheet cutting apparatus described in (2),
The heating device is a plate-shaped heater device, and is characterized in that the heater device is adhesively fixed to a side wall surface of a widened portion of the support frame member.

In the present invention, the heating device is a plate-shaped heater device, and since the heater device is adhesively fixed to the side wall surface of the widened portion of the support frame member, the plate-shaped heater device is formed. As a result, the contact portion of the pedestal that comes into contact with the resin molded sheet can be heated to a substantially uniform temperature. Therefore, it is possible to significantly suppress the variation in the heating temperature with respect to the cut portion of the resin molded sheet. As a result, it is possible to stably reduce or avoid the generation of cracks and chips during cutting in the entire range of the cut portion of the resin molded sheet.

Further, since the heater device is adhesively fixed to the side wall surface of the widened portion of the support frame member, the heat generation amount of the heater device can be stored in the widened portion formed at least within the range of the seat width of the support frame member. Therefore, the heat storage amount of the widening portion is added to the heat generation amount of the heater device, and the contact portion in contact with the resin molded sheet in the pedestal can be quickly heated to a predetermined temperature. As a result, while contributing to energy saving of the heater device, the cutting speed of the resin molded sheet is improved or the cycle time at the time of cutting is shortened, and the generation of cracks and chips in the high-speed cutting of the resin molded sheet is reduced or avoided. Can be made to.

(4) In the resin molded sheet cutting apparatus according to any one of (1) to (3).
The cutter is a circular blade formed in a thin plate shape, and is characterized by having a drive mechanism for reciprocating the circular blade from a retracted position outward in the sheet width direction to a forward position on the opposite side along a cutting line. And.

In the present invention, since the cutter is a circular blade formed in a thin plate shape, when the blade edge of the cutter bites into the cutter side of the resin molded sheet, the cutter side of the resin molded sheet bites into the cutter side in advance. The amount of crushing is reduced, and the tensile force that expands the non-cutter side of the resin molded sheet that the cutting edge of the cutter bites into in the delayed direction can be reduced. Therefore, the pedestal and the holding table can restrain the resin molded sheet more strongly along the cutting line, and the breakage of the resin molded sheet on the non-cutter side can be further delayed or more reliably avoided.

In addition, the cutter is a circular blade formed in the shape of a thin plate, and is equipped with a drive mechanism that reciprocates the circular blade from the retracted position outward in the sheet width direction to the forward position on the opposite side along the cutting line, so that it is circular. The position of the cutting edge that cuts the resin molded sheet when the blade moves from the retracted position to the forward position, and the position of the cutting edge that cuts the resin molded sheet when the circular blade moves from the forward position to the backward position for the next cutting. The position can be separated into different positions, and the durability of the cutting edge can be improved. As a result, when a resin molded sheet having a plurality of heat-molded resin molded products is cut to a predetermined length, the generation of cracks and chips can be further reduced or avoided for a longer period of time.

(5) In the resin molded sheet cutting apparatus described in (4),
The holding base is connected to a fixed portion of the drive mechanism, and the cutter is height-adjustably connected to a movable portion of the drive mechanism via a grip bracket.

In the present invention, the holding base is connected to the fixed portion of the drive mechanism, and the cutter is connected to the movable portion of the drive mechanism in a height-adjustable manner via the grip bracket, so that the height of the grip bracket with respect to the movable portion is high. By adjusting the height, the amount of protrusion of the cutting edge of the cutter from the contact portion with the resin molded sheet in the holding table can be easily adjusted. Therefore, the biting amount of the cutting edge of the cutter capable of optimally cutting the resin molded sheet can be appropriately adjusted according to the plate thickness of the resin molded sheet and the like. As a result, it is possible to easily reduce or avoid cracking and generation of chips during cutting for a plurality of types of resin molded sheets having different plate thicknesses and the like.

(6) In the resin molded sheet cutting apparatus described in (5),
On the holding table, a standing wall portion that rises upward from the abutting portion that abuts on the resin molded sheet is formed with a predetermined width along the movement locus of the gripping bracket, and the cutter advances on the standing wall portion. The gripping bracket is characterized in that an operating notch is formed corresponding to the position or the retracted position.

In the present invention, on the holding table, a standing wall portion that stands up upward from the contact portion that abuts on the resin molded sheet is formed with a predetermined width along the movement locus of the gripping bracket, and the vertical wall portion is formed by advancing the cutter. Since the notch for operation of the grip bracket is formed corresponding to the position or the retracted position, it is easy to operate the grip bracket at the forward position or the retracted position of the cutter in which the notch for operation is formed. The cutter can be attached / detached or the cutting position of the cutting edge can be changed. In this case, it is not necessary to remove the holding base from the fixed portion of the drive mechanism. Therefore, while observing the cutting status of the resin molded sheet, it is possible to quickly replace the cutter or change the position of the cutting edge at a required time. As a result, it is possible to prevent the generation or increase of cracks and chips due to wear and tear of the cutting edge.

(7) In the resin molded sheet cutting apparatus according to any one of (1) to (6).
The abutting portion of the pedestal that comes into contact with the resin molded sheet is characterized in that a protrusion that bites into the resin molded sheet is formed along a cutting line.

In the present invention, a protrusion that bites into the resin molded sheet is formed along the cutting line at the contact portion that comes into contact with the resin molded sheet of the pedestal, so that the protrusion is formed when the cutter cuts the resin molded sheet. When the portion bites into the resin molded sheet, the pedestal and the holding table can restrain the resin molded sheet even more strongly along the cutting line. Further, when the protrusion bites into the resin molded sheet, the contact area in contact with the resin molded sheet of the pedestal increases, and the amount of heat of the heated pedestal is bitten by the cutting edge of the cutter with a delay. It can be transmitted to the side promptly. As a result, the pedestal and the holding base restrain the resin molded sheet even more strongly along the cutting line, and quickly soften the non-cutter side of the resin molded sheet, so that cracks and chips in high-speed cutting of the resin molded sheet can be removed. Occurrence can be further reduced or avoided.

According to the present invention, a resin molded sheet cutting device capable of reducing or avoiding cracks and chips with a simple structure when cutting a resin molded sheet having a plurality of heat-molded resin molded products to a predetermined length. Can be provided.

It is a schematic block diagram of the thermoforming machine including the resin molding sheet cutting apparatus which concerns on one aspect of this Embodiment. It is a schematic diagram of the resin molded sheet cutting apparatus which is used for the thermoforming machine shown in FIG. 1 and which concerns on one aspect of this Embodiment. FIG. 2 is a side view taken along the line A as shown in FIG. FIG. 3 is a cross-sectional view taken along the line BB shown in FIG. It is an enlarged sectional view of the X part shown in FIG. 4A. It is a detailed cross-sectional view of the cutting state in part C shown in FIG. FIG. 5 is a cross-sectional view taken along the line DD shown in FIG. It is a detailed cross-sectional view of the cutting state in part C shown in FIG. 3 in the modification of this resin molded sheet cutting apparatus. FIG. 7 is a cross-sectional view taken along the line EE shown in FIG. It is a schematic sectional drawing of the thermoforming machine disclosed in Patent Document 1. FIG. It is sectional drawing of the main part which shows the cutting state in the fixed size cutting machine shown in FIG.

Next, the resin molded sheet cutting apparatus according to one embodiment of the present embodiment will be described in detail with reference to the drawings. Specifically, the configuration of the thermoforming machine including the present resin molded sheet cutting apparatus as a part thereof will be briefly described, and then the configuration and the operation method of the present resin molded sheet cutting apparatus will be described in detail.

<Structure of thermoforming machine including this resin molding sheet cutting device>
First, the configuration of the thermoforming machine including the present resin molding sheet cutting device will be briefly described with reference to FIG. 1. FIG. 1 shows a schematic configuration diagram of a thermoforming machine including a resin molding sheet cutting device according to an embodiment of the present embodiment.

As shown in FIG. 1, the thermoforming machine 200 including the present resin molding sheet cutting device includes a sheet rewinding stage (S1) and a sheet heating stage (S1) arranged from the upstream side to the downstream side in the sheet feeding direction. S2), a forming stage (S3), a sheet cutting stage (S4), and a loading stage (S5) are provided. Here, the sheet rewinding stage (S1) is a stage for intermittently rewinding the thermoplastic resin sheet JC wound in a roll shape. As the thermoplastic resin sheet JC, various resin sheet JCs such as amorphous polystyrene (PS), crystalline polypropylene (PP), polyethylene terephthalate (PET) and the like can be used depending on the application. .. The rewound resin sheet JC is temporarily made to stand by in a loop-shaped hanging state in front of the next sheet heating stage (S2) for reasons such as eliminating the winding habit.

The next sheet heating stage (S2) is a stage in which the rewound resin sheet JC is held horizontally and heated to a temperature suitable for molding. The heating temperature depends on the type, plate thickness, molding shape, etc. of the resin sheet JC so that proper heat molding can be performed while avoiding wrinkles, cracks, etc. of the resin sheet JC in the next molding stage (S3). , Set as appropriate. The next molding stage (S3) is a stage in which a resin sheet JC heated to a predetermined temperature is heat-molded into a predetermined shape by a mold (not shown) capable of vacuum forming or vacuum forming. .. In the molding stage (S3), for example, in addition to trays for food, resin molded products JS having various shapes can be formed. Usually, the mold has a plurality of molded surfaces of the same shape formed so that a plurality of the same resin molded product JS can be molded by one heat molding. Here, a mold is formed so that three rows of resin molded products JS are arranged in the sheet width direction and two rows of resin molded products JS are arranged in the sheet feeding direction so that molding is possible. In the molding stage (S3), the heat-molded resin molded product JS is cooled to a predetermined temperature at which it can be taken out, and then the mold is opened and sent to the next sheet cutting stage (S4).

Further, the next sheet cutting stage (S4) is a stage for cutting a resin molded sheet J having a plurality of resin molded products JS heat-molded in the molding stage (S3) to a predetermined length. In the sheet cutting stage (S4), for example, at the boundary portion of a plurality of resin molded products JS to be molded at one time in the molding stage (S3) using the resin molded sheet cutting devices 10 and 10B according to the present embodiment described later. , Cut in the sheet width direction. An idle stage is provided between the molding stage (S3) and the sheet cutting stage (S4) for reasons such as installing a charging device for charging the resin molding sheet J into the resin molding sheet cutting devices 10 and 10B. It is provided.

Further, the loading stage (S5) is a stage in which a plurality of resin molded sheets J cut in the sheet cutting stage (S4) are laminated in the vertical direction and temporarily stored. The plurality of laminated resin molded sheets J are conveyed to a separately provided cutting device, and the outer peripheral edge of the resin molded product JS is cut to form the resin molded product JS as a product.

<Configuration and operation method of this resin molded sheet cutting device>
Next, the configuration and operation method of the resin molded sheet cutting device will be described with reference to FIGS. 2 to 8. FIG. 2 shows a schematic view of a resin molded sheet cutting device used in the thermoforming machine shown in FIG. 1 and according to one embodiment of the present embodiment. FIG. 3 shows a side view of the arrow A shown in FIG. FIG. 4A shows a sectional view taken along the line BB shown in FIG. FIG. 4B shows an enlarged cross-sectional view of a portion X shown in FIG. 4A. FIG. 5 shows a detailed cross-sectional view of the cutting state in the portion C shown in FIG. FIG. 6 shows a cross-sectional view taken along the line DD shown in FIG. FIG. 7 shows a detailed cross-sectional view of a cutting state in the portion C shown in FIG. 3 in a modified example of the present resin molded sheet cutting device. FIG. 8 shows a cross-sectional view taken along the line EE shown in FIG.

As shown in FIGS. 2 to 6, in the resin molded sheet cutting device 10, the cutter 1 having the cutting edge 11 formed in a wedge shape and a plurality of resin molded products JS arranged and heat-molded facing the cutter 1 The resin molded sheet J is provided with a pedestal 2 in which a cutting groove 22 is formed in the sheet width direction in contact with the resin molded sheet J and the cutting edge 11 is inserted, and the cutter 1 cuts the resin molded sheet J in contact with the pedestal 2. A resin molded sheet cutting device 10 that cuts to a predetermined length L (see FIG. 1) at the position of the groove 22. Here, the cutter 1 may be a straight blade (so-called Thomson blade or the like) or a circular blade described later, as long as the blade edge 11 is formed in a wedge shape. However, in the case of a straight blade, it is preferable to provide a shear angle or the like on the cutting edge 11 to reduce the cutting load of the resin molded sheet J.

Further, a heating device 3 for heating the pedestal 2 is provided in the vicinity of the pedestal 2 or the pedestal 2, and the resin molded sheet J is placed at a position facing the pedestal 2 with the cutting line SL of the cutter 1 interposed therebetween. It is provided with a holding table 4 to be sandwiched between the cradle 2 and the cradle 2. The holding table 4 is formed with an insertion groove 44 through which the cutting edge 11 of the cutter 1 is inserted along the cutting line SL. The groove width of the insertion groove 44 of the holding table 4 is formed to be substantially the same as the groove width of the cutting groove 22 of the pedestal 2. Here, in FIGS. 2 and 3, the pedestal 2 is formed so as to be vertically movable with respect to the cutter 1 and the holding base 4, but the cutter 1 and the holding base 4 can be moved up and down with respect to the pedestal 2. It may be formed in. Further, in FIGS. 3, 4A and 4B, the heating device 3 is mounted on the pedestal 2 that moves up and down, and the heating device 3 directly heats the pedestal 2, but the pedestal that moves the heating device 3 up and down. The heating device 3 may indirectly heat the cradle 2 by installing it in the vicinity of 2.

Then, the temperature of the pedestal 2 heated by the heating device 3 rises to a temperature equal to or higher than the temperature of the holding pedestal 4 in which the amount of heat transferred from the pedestal 2 is dissipated to a certain extent. Therefore, when the cutter 1 cuts the resin molding sheet J having the plurality of heat-molded resin molded products JS to a predetermined length, the cutter 1 comes into contact with the holding table 4 and the cutting edge 11 of the cutter 1 bites into the resin molding in advance. The anti-cutter side (lower end) J2 of the resin molded sheet J, which comes into contact with the cradle 2 from the cutter side (upper end) J1 of the sheet J and the cutting edge 11 of the cutter 1 bites in with a delay, is along the cutting line SL of the cutter 1. Can be heated more.

In this case, on the cutter side J1 of the resin molded sheet J that comes into contact with the holding table 4 and the cutting edge 11 of the cutter 1 bites in advance, excessive softening due to a temperature rise is avoided. Therefore, it is possible to suppress dripping ND due to excessive softening of the cutter side J1 of the resin molded sheet J. On the other hand, when the temperature of the pedestal 2 rises to a temperature higher than the temperature of the holding pedestal 4, the anti-cutter side J2 of the resin molded sheet J that comes into contact with the pedestal 2 and the cutting edge 11 of the cutter 1 bites in with a delay. , More softening along the cutting line SL can improve the elongation limit leading to fracture.

By the way, the pressing force Q1 of the cutter 1 against the resin molded sheet J at the time of cutting cuts while crushing the cutter side (upper end portion) J1 of the resin molded sheet J in which the cutting edge 11 bites in advance in a wedge shape and diagonally outward. It acts as a tensile force Q3 that horizontally expands the anti-cutter side (lower end portion) J2 of the resin molded sheet J that the cutting edge 11 bites in with a delay via the pressing force Q2 that pushes the resin to.

A holding table 4 for sandwiching the resin molded sheet J with the pedestal 2 with the cutting line SL of the cutter 1 interposed therebetween was provided at a position facing the pedestal 2 with respect to the tensile force Q3. When the cutter 1 cuts the resin molded sheet J, the pedestal 2 and the holding table 4 restrain the resin molded sheet J along the cutting line SL. When the cutting edge 11 of the cutter 1 formed in a wedge shape bites into the cutter side J1 of the resin molding sheet J due to the binding force R2 (friction force) restrained by the pedestal 2 and the holding base 4, the cutting edge 11 of the cutter 1 It is possible to cancel the tensile force Q3 that expands the anti-cutter side J2 of the resin molded sheet J that bites in with a delay in the horizontal direction orthogonal to the cutting line SL.

From the above, the cutting edge 11 of the cutter 1 bites into the cutter side J1 of the resin molding sheet J while softening the anti-cutter side J2 of the resin molding sheet J along the cutting line SL and improving the elongation limit leading to breakage. At this time, by canceling the tensile force Q3 that expands the anti-cutter side J2 of the resin molded sheet J in the horizontal direction, it is possible to delay or avoid the breakage of the anti-cutter side J2 of the resin molded sheet J. As a result, when the resin molded sheet J having the plurality of heat-molded resin molded products JS is cut to a predetermined length, cracks and chips are easily generated due to the breakage of the anti-cutter side J2 of the resin molded sheet J. Can be reduced or avoided. Therefore, according to the present embodiment, when a resin molded sheet J having a plurality of heat-molded resin molded products JS is cut to a predetermined length, the generation of cracks and chips can be reduced or avoided with a simple structure. A resin molded sheet cutting device 10 can be provided.

The temperature of the lower end portion (anti-cutter side) J2 of the resin molding sheet J heated by the cradle 2 is higher than, for example, the glass transition temperature of the resin molding sheet J, and resin molding is performed on the molding stage (S3) described above. It is preferably lower than the molding temperature when the product JS is heat-molded. By heating the resin molded sheet J above the glass transition temperature, the elongation limit leading to fracture is improved, and by heating below the molding temperature, deformation and the like when the pedestal and the holding table are sandwiched are reduced or avoided. This is to make it happen.

Further, since the resin molded sheet J does not have free electrons like metal, the thermal conductivity is generally smaller than that of metal. Therefore, after the pedestal 2 and the holding table 4 sandwich the resin molded sheet J, a predetermined heating time is required before the cutting action by the cutter 1 is started. This heating time is preferably adjusted according to the plate thickness, thermal conductivity, etc. of the resin molded sheet J. Further, in the resin molded sheets J having the same plate thickness, the larger the thermal conductivity, the more easily the amount of heat is diffused to the outside other than the cut portion, so that the heating time may be longer than that of the one having a small thermal conductivity. , It is more preferable in reducing or avoiding cracking and generation of chips during cutting. In the experiment of the present applicant, for example, the heating time for polyethylene terephthalate (PET) having a thermal conductivity of about 0.3 (W / mK) is such that polystyrene (PS) having a thermal conductivity of about 0.1 (W / mK) is used. ), It is preferable to make it longer than the heating time.

Next, in the resin molded sheet cutting device 10, the pedestal 2 is provided with a support frame member 23 in which a widening portion 231 for supporting the abutting portion 21 in contact with the resin molded sheet J is formed at least within the range of the sheet width. At both ends 232 of the support frame member 23, a holding position K3 in which the pedestal 2 holds the resin molded sheet J in close proximity to the holding pedestal 4 and the pedestal 2 are separated from the holding pedestal 4 to form a resin molded sheet. It is preferable that an elevating device 7 for moving the cradle 2 up and down is connected to the open position K4 through which J is passed. Here, as shown in FIGS. 2 and 3, the elevating device 7 uses a fluid pressure cylinder device 7S in which the cylinder rod 71 extends upward from the cylinder case 72, but the fluid pressure cylinder device 7S does not necessarily have to be used. There is no need to limit it.

Further, as shown in FIGS. 3, 4A and 4B, the support frame member 23 is formed in a substantially rectangular cross section and extends horizontally to the outside of the seat width. At the upper end of the support frame member 23, a thin-walled portion 234 having a thickness equal to or larger than the groove width of the cutting groove 22 is formed, and a pedestal 2 divided into two on the upstream side and the downstream side across the cutting groove 22 is formed. , It is fastened with the thin-walled portion 234 sandwiched between them. The pedestal 2 is formed with a stepped portion 24 that transmits a load in the vertical direction to the upper end surface of the thin-walled portion 234. Further, at the lower end portion of the support frame member 23, a widening portion 231 that is widened downward is integrally formed at least within the range of the seat width. A minute gap is formed between the upper end surface of the widening portion 231 and the lower end surface 25 of the cradle 2. The amount of widening of the widening portion 231 in the vertical direction is formed substantially uniformly in the sheet width direction.

Further, as shown in FIGS. 2 and 3, the resin molded sheet cutting device 10 stands upward at a base portion 61 extending in the sheet width direction with a predetermined plate thickness and both ends 61T of the base portion 61. The apparatus main body 6 includes a pair of side wall portions 62 and an upper frame portion 622 that connects the upper ends of the side wall portions 62 to each other. Both ends 232 of the support frame member 23 are connected to the tip of the cylinder rod 71 via a connecting bracket 233, and the cylinder case 72 is fastened to both ends 61T of the base portion 61.

Further, a pair of guide bushes 73 are fixed to the base portion 61 with the cylinder case 72 interposed therebetween as a guide member of the fluid pressure cylinder device 7S. A pair of guide rods 74 connected to the connecting bracket 233 are inserted into the guide bush 73, respectively, to improve the position accuracy of the pedestal 2 at the holding position K3.

From the above configuration, when the elevating device 7 operates and the pedestal 2 sandwiches the resin molded sheet J in the vicinity of the holding pedestal 4, the amount of bending of the contact portion 21 that comes into contact with the resin molded sheet J in the pedestal 2 Can be reduced by the rigidity of the widening portion 231 formed at least within the range of the seat width. Therefore, the pedestal 2 and the holding table 4 restrain the resin molded sheet J substantially uniformly along the cutting line SL, and the generation of cracks and chips during cutting can be reduced or avoided more stably. can.

Further, after cutting the resin molded sheet J, the elevating device 7 operates to move the pedestal 2 to the open position K4 separated from the holding pedestal 4. As a result, the resin-molded sheet J after cutting can be passed from between the receiving table 2 and the holding table 4 in the feeding direction, and the resin-molded sheet J can be conveyed to the next cutting position. A mounting table 64 on which the resin molded sheet J cut to a predetermined length L is mounted is provided on the downstream side of the cradle 2. A plurality of resin molded sheets J having a plurality of resin molded products JS are stacked vertically on the mounting table 64 and temporarily stored. Further, on the upstream side of the pedestal 2, a guide belt 65 for passing the resin molded sheet J to be conveyed without interfering with the pedestal 2 is provided. The resin molded sheet J can slide on the upper surface of the guide belt 65 and move.

Next, as shown in FIGS. 3, 4A, and 4B, the heating device 3 is a plate-shaped heater device 3H, and the heater device is on the side wall surface 231S of the widening portion 231 of the support frame member 23. It is preferable that 3H is adhesively fixed. Here, as the heater device 3H, a rubber heater 3R formed by covering a plurality of heater wires 3H1 arranged in parallel with a rubber sheet 3H2 can be used, but the heater device 3H is not necessarily limited to the rubber heater 3R. ..

From the above configuration, the plate-shaped heater device 3H can heat the cutting groove 22 side of the contact portion 21 in contact with the resin molded sheet J in the pedestal 2 to a more uniform temperature. Therefore, the variation in the heating temperature with respect to the cut portion of the resin molded sheet J can be significantly suppressed. Further, the amount of heat of the heater device 3H is transferred from the widening portion 231 to the pedestal 2 via the thin-walled portion 234. Therefore, the temperature of the cradle 2 rises more stably on the side of the cutting groove 22 adjacent to the thin-walled portion 234. As a result, it is possible to stably reduce or avoid the generation of cracks and chips during cutting in the entire range of the cut portion of the resin molded sheet J.

Since the heater device 3H is adhesively fixed to the side wall surface 231S of the widening portion 231 of the support frame member 23, the heat generation amount of the heater device 3H is formed within at least the range of the seat width of the support frame member 23. Heat will be stored in the widening portion 231. Therefore, the heat storage amount of the widening portion 231 is added to the heat generation amount of the heater device 3H, and the contact portion 21 in contact with the resin molded sheet J in the pedestal 2 is quickly heated to a predetermined temperature. As a result, while contributing to energy saving of the heater device 3H, the cutting speed of the resin molded sheet J is improved or the cycle time at the time of cutting is shortened, and cracks and chips are generated in the high speed cutting of the resin molded sheet J. It can be reduced or avoided.

Next, the cutter 1 is preferably a circular blade 1M formed in a thin plate shape. The cutting edge angle θ of the circular blade 1M is more preferably about 3 to 10 °. In this case, when the cutting edge 11 of the cutter 1 (1M) bites into the cutter side J1 of the resin molding sheet J, the cutting edge 11 of the cutter 1 (1M) pushes the cutter side J1 of the resin molding sheet J into a wedge shape. The amount of crushing will decrease. Then, it is possible to reduce the tensile force Q3 that expands the anti-cutter side J2 of the resin molded sheet J that the cutting edge 11 of the cutter 1 (1M) bites in with a delay in the horizontal direction. Therefore, the pedestal 2 and the holding pedestal 4 can restrain the resin molded sheet J even more strongly along the cutting line SL. Thereby, the breakage of the anti-cutter side J2 of the resin molded sheet J can be further delayed or more reliably avoided.

Further, the cutter 1 is a circular blade 1M formed in a thin plate shape, and is a drive mechanism for reciprocating the circular blade 1M from the retracted position K1 outward in the sheet width direction to the advancing position K2 on the opposite side along the cutting line SL. It is preferable to have 5. In this case, the position of the cutting edge 11 that cuts the resin molded sheet J when the circular blade 1M moves from the retracting position K1 to the advancing position K2, and the circular blade 1M moves from the advancing position K2 to the retracting position K1 for the next cutting. The position of the cutting edge 11 that cuts the resin molded sheet J when moving can be separated into different positions, and the durability of the cutting edge 11 is improved. As a result, when the resin molded sheet J having the plurality of heat-molded resin molded products JS is cut to a predetermined length, the generation of cracks and chips can be further reduced or avoided for a longer period of time.

Next, it is preferable that the holding base 4 is connected to the fixed portion 53 of the drive mechanism 5, and the cutter 1 is connected to the movable portion 51 of the drive mechanism 5 via the grip bracket 52 so that the height can be adjusted. Here, as shown in FIGS. 2 to 4A, the drive mechanism 5 has a fixed portion 53 extending in the seat width direction and having an outer shape formed in a substantially rectangular cross section, and a seat width direction along the fixed portion 53. Although a rodless cylinder 5S having a movable portion 51 formed so as to be reciprocating to the rodless cylinder 5S is used, it is not always limited to the rodless cylinder 5S.

The grip bracket 52 has a first bracket 521 screwed to the movable portion 51 and a second bracket 522 screwed to the first bracket 521 to hold the circular blade 1M between the first bracket 521. I have. The screw member for screw-fastening the first bracket 521 and the second bracket 522 includes a first screw 12 which is inserted through the center of the circular blade 1M and fastened, and a plurality of screw members which are fastened to the outside of the outer peripheral edge of the circular blade 1M. It is provided with a second screw 13. Further, a push screw 523 that moves the first bracket 521 up and down along the guide member 511 fixed to the movable portion 51 is rotatably engaged with the movable portion 51. Therefore, the vertical position of the circular blade 1M with respect to the movable portion 51 can be adjusted by rotating the set screw 523 with the circular blade 1M sandwiched between the first bracket 521 and the second bracket 522. ..

From the above configuration, by adjusting the height of the grip bracket 52 with respect to the movable portion 51, the protrusion amount α of the cutting edge where the cutting edge 11 of the cutter 1 protrudes from the contact portion 41 with respect to the resin molded sheet J in the holding table 4 can be obtained. It can be easily adjusted. Therefore, the biting amount of the cutting edge 11 of the cutter 1 capable of optimally cutting the resin molded sheet J can be appropriately adjusted according to the plate thickness of the resin molded sheet J and the like. As a result, it is possible to easily reduce or avoid cracking and generation of chips during cutting for a plurality of types of resin molded sheets J having different plate thicknesses and the like.

Next, on the holding table 4, a standing wall portion 43 that stands up upward from the abutting portion 41 that abuts on the resin molded sheet J is formed with a predetermined width along the movement locus of the gripping bracket 52, and the standing wall portion 43 has a predetermined width. It is preferable that the operation notch 431 of the gripping bracket 52 is formed corresponding to the forward position K2 or the backward position K1 of the cutter 1.

Here, as shown in FIGS. 3 and 4A, the vertical wall portion 43 has a downstream vertical wall portion 43a adjacent to the downstream side of the grip bracket 52 and an upstream side vertical wall portion 43b adjacent to the upstream side of the grip bracket 52. The operation notch portion 431 is composed of a first screw 12 and a second screw 12 for fastening the grip bracket 52 to both the upstream side standing wall portion 43b and the downstream side standing wall portion 43a corresponding to the retracted position K1 of the cutter 1. The screws 13 and the like are formed so as to be operable. Reinforcing plates 431 and 432 that reinforce the stepped bent portion formed to avoid interference with the grip bracket 52 are joined to the downstream side standing wall portion 43a. The operation notch 431 is also formed in the reinforcing plates 431 and 432.

From the above configuration, at the forward position K2 or the backward position K1 of the cutter 1 in which the notch for operation 431 is formed, the fastening screw of the gripping bracket 52 can be screwed without removing the holding base 4 from the fixing portion 53 of the drive mechanism 5. By operating, the cutter 1 can be easily attached / detached or the cutting position of the cutting edge 11 can be changed. Therefore, the cutter 1 can be replaced and the position of the cutting edge 11 to be cut can be quickly changed at a required time while observing the cutting state of the resin molded sheet J. As a result, it is possible to prevent the generation or increase of cracks and chips due to the wear and tear of the cutting edge 11. Further, since the vertical wall portion 43 is formed with a predetermined width along the movement locus of the grip bracket 52, the rigidity of the holding table 4 is made uniform in the seat width direction, and the heat dissipation and heat storage property of the holding table 4 are made uniform. The temperature of the holding table 4 can be made uniform in the seat width direction.

As shown in FIGS. 2 and 3, the fixing portion 53 of the drive mechanism 5 (5S) is provided at both end portions 531 in the seat width direction via a screw mechanism provided with a ball screw 624 and a nut portion 625. , Is connected to the side wall portion 62 of the apparatus main body 6 so as to be movable up and down. A pulley 626 connected to each other by a chain is formed at the upper ends of both ball screws 624, and a handle 623 is connected to one ball screw 624. For example, the heights of the holding base 4 and the drive mechanism 5 with respect to the apparatus main body 6 can be changed by rotating the handle 623 according to the protruding direction and the amount of protrusion of the resin molded product JS with respect to the resin molded sheet J. can.

Further, as shown in FIGS. 2 and 3, the apparatus main body 6 is mounted on a base 63 installed on the floor surface FL so as to be reciprocating in the sheet feeding direction. Specifically, a roller support portion 611 to which a moving roller body 612 is mounted is connected to both ends 61T of the base portion 61 in the apparatus main body 6. The roller support portion 611 is formed with a nut portion 613 that engages with the ball screw 632 extending in the sheet feeding direction on the base 63. Further, on the base 63, a rail portion 631 for guiding the roller body 612 in the sheet feeding direction is extended, and a drive motor 635 for rotating the ball screw 632 is installed. A pulley 633 is formed at the tip of the ball screw 632, and the pulley 633 is connected to the drive motor 635 via a drive belt 634.

Thereby, the drive motor 635 can be operated to rotate the ball screw 632, and the apparatus main body 63 can be moved in the sheet feed direction via the nut portion 613 that engages with the ball screw 632. For example, at the start of cutting a lot, the apparatus main body 6 is moved to a feed direction forward position set for each product, the terminal of the resin molded sheet J is cut, and then returned to the cutting position shown in FIG. 2, and subsequent cutting is performed. I do. In the subsequent cutting, the resin molded sheet J having the plurality of heat-molded resin molded products JS can be cut to a predetermined length L.

(Modification example)
Although the resin molded sheet cutting apparatus 10 according to the present embodiment has been described in detail above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the present invention. For example, as the present resin molded sheet cutting device 10B according to the modified example, as shown in FIGS. 7 and 8, the contact portion 21B in contact with the resin molded sheet J of the pedestal 2B has a protrusion that bites into the resin molded sheet J. The portion 211B may be formed along the cutting line SL. The resin molded sheet cutting device 10B is common to the above-mentioned resin molded sheet cutting device 10 in configurations other than the above.

In this case, when the cutter 1 cuts the resin molded sheet J, the protrusion 211B bites into the resin molded sheet J, so that the pedestal 2B and the holding table 4 cut the resin molded sheet J along the cutting line SL. It can be restrained even more strongly. Further, when the protrusion 211B bites into the resin molded sheet J, the contact area of the pedestal 2B in contact with the resin molded sheet J increases, and the heat amount of the heated pedestal 2B is delayed by the cutting edge 11 of the cutter 1. It can be quickly transmitted to the anti-cutter side J2 of the resin molded sheet J that bites into the resin.

As a result, while the pedestal 2 and the holding table 4 restrain the resin molded sheet J more strongly along the cutting line SL, the anti-cutter side J2 of the resin molded sheet J is quickly softened, and the high speed of the resin molded sheet J is obtained. It is possible to further reduce or avoid the generation of cracks and chips in cutting. A plurality of protrusions 211B may be arranged along the cutting line SL in the shape of a pyramid or a conical microprojection, or may be extended along the cutting line SL in the shape of a long triangular bead. Is also good. The protrusions 211B of the triangular beads may be arranged independently or in a plurality of rows within the range of the seat width. For example, in the protrusion 211B of a quadrangular pyramid or a triangular bead, when the protrusion 211B adjacent to the cutting groove 22 bites into the resin molding sheet J, the pushing force R3 that pushes the counter-cutter side J2 of the resin molding sheet J toward the cutting line SL side. Works. By this pushing force R3, the breakage of the anti-cutter side J2 of the resin molded sheet J can be further delayed or avoided.

<Action effect>
According to the resin molded sheet cutting devices 10 and 10B according to the present embodiment described in detail above, the pedestal 2 or the pedestal 2 is provided with a heating device 3 for heating the pedestal 2 in the vicinity of the pedestal 2 or the pedestal 2. At the position facing the cutter 1, a holding table 4 for sandwiching the resin molded sheet J with the receiving table 2 is provided, so that the temperature of the receiving table 2 heated by the heating device 3 can be adjusted. The amount of heat transferred from the cradle 2 can be raised to a temperature equal to or higher than the temperature of the holding pedestal 4 to which heat is dissipated to a certain extent. Therefore, when the resin molded sheet J having the plurality of heat-molded resin molded products JS is cut to a predetermined length, the cutter of the resin molded sheet J that comes into contact with the holding table 4 and the cutting edge 11 of the cutter 1 bites in advance. The anti-cutter side J2 of the resin molded sheet J, which comes into contact with the pedestal 2 and bites into the cutter 1 with a delay from the side J1, can be heated more along the cutting line SL of the cutter 1. Therefore, the anti-cutter of the resin molding sheet J that the cutting edge 11 of the cutter 1 bites in with a delay while suppressing the dripping ND due to the excessive softening of the cutter side J1 of the resin molding sheet J that the cutting edge 11 of the cutter 1 bites in advance. The side J2 can be softened more along the cutting line SL to improve the elongation limit leading to breakage.

Further, at a position facing the pedestal 2, a holding table 4 for sandwiching the resin molding sheet J with the cradle 2 across the cutting line SL of the cutter 1 is provided, so that the cutter 1 is provided with the resin molding sheet J. The pedestal 2 and the holding table 4 can restrain the resin molded sheet J along the cutting line SL. Therefore, when the cutting edge 11 of the cutter 1 formed in a frictional shape bites into the cutter side J1 of the resin molding sheet J, the cutting edge 11 of the cutter 1 bites in behind the other side J2 of the resin molding sheet J with respect to the cutting line SL. The tensile force Q3 that expands in the horizontal direction orthogonal to each other can be canceled by the binding force R2 (friction force) in which the pedestal 2 and the holding table 4 restrain the resin molded sheet J along the cutting line SL.

Therefore, when the cutting edge 11 of the cutter 1 bites into the cutter side J1 of the resin molding sheet J while softening the anti-cutter side J2 of the resin molding sheet J along the cutting line SL and improving the elongation limit leading to breakage, the resin By canceling the tensile force Q3 that expands the anti-cutter side J2 of the molded sheet J in the horizontal direction, it is possible to delay or avoid the breakage of the anti-cutter side J2 of the resin molded sheet J. As a result, when the resin molded sheet J having the plurality of heat-molded resin molded products JS is cut to a predetermined length, the generation of cracks and chips due to the breakage of the anti-cutter side J2 of the resin molded sheet J is reduced. Or it can be avoided.

Therefore, according to the present embodiment, when a resin molded sheet J having a plurality of heat-molded resin molded products JS is cut to a predetermined length, the generation of cracks and chips can be reduced or avoided with a simple structure. Resin molded sheet cutting devices 10 and 10B can be provided.

Further, according to the present embodiment, the pedestal 2 is provided with a support frame member 23 in which a widening portion 231 for supporting the abutting portion 21 in contact with the resin molded sheet J is formed at least within the range of the sheet width. At both ends 232 of the frame member 23, the pedestal 2 passes through the resin molded sheet J at a holding position K3 in which the pedestal 2 is close to the holding table 4 and holds the resin molded sheet J, and the pedestal 2 is separated from the holding table 4 and passes through the resin molded sheet J. Since the elevating device 7 for moving the pedestal 2 up and down is connected to the open position K4 to be moved, the elevating device 7 operates to cut the resin molded sheet J, and the pedestal 2 becomes the holding table 4. When sandwiching the resin molded sheet J in close proximity, the amount of bending of the contact portion 21 in contact with the resin molded sheet J in the pedestal 2 is reduced by the rigidity of the widening portion 231 formed at least within the range of the sheet width. Can be done. Therefore, the pedestal 2 and the holding table 4 restrain the resin molded sheet J substantially uniformly along the cutting line SL, and the generation of cracks and chips during cutting can be reduced or avoided more stably. can.

Further, according to the present embodiment, the heating device 3 is a plate-shaped heater device 3H, and the heater device 3H is adhesively fixed to the side wall surface 231S of the widening portion 231 of the support frame member 23. Therefore, the plate-shaped heater device 3H can heat the contact portion 21 in contact with the resin molded sheet J in the pedestal 2 to a substantially uniform temperature. Therefore, the variation in the heating temperature with respect to the cut portion of the resin molded sheet J can be significantly suppressed. As a result, it is possible to stably reduce or avoid the generation of cracks and chips during cutting in the entire range of the cut portion of the resin molded sheet J.

Further, since the heater device 3H is adhesively fixed to the side wall surface 231S of the widening portion 231 of the support frame member 23, the heat generation amount of the heater device 3H is formed within at least the range of the seat width of the support frame member 23. Heat can be stored in the widening portion 231. Therefore, the heat storage amount of the widening portion 231 is added to the heat generation amount of the heater device 3H, and the contact portion 21 in contact with the resin molded sheet J in the pedestal 2 can be quickly heated to a predetermined temperature. As a result, while contributing to energy saving of the heater device 3H, the cutting speed of the resin molded sheet J is improved or the cycle time at the time of cutting is shortened, and cracks and chips are generated in the high speed cutting of the resin molded sheet J. It can be reduced or avoided.

Further, according to the present embodiment, since the cutter 1 is a circular blade 1M formed in a thin plate shape, when the cutting edge 11 of the cutter 1 (1M) bites into the cutter side J1 of the resin molding sheet J, the cutter 1 ( The amount of crushing that crushes the cutter side J1 of the resin molded sheet J that the cutting edge 11 of the cutter 1 (1M) precedes in a wedge shape decreases, and the cutting edge 11 of the cutter 1 (1M) bites in the anti-cutter of the resin molding sheet J with a delay. The tensile force Q3 that expands the side J2 in the horizontal direction can be reduced. Therefore, the pedestal 2 and the holding table 4 can restrain the resin molded sheet J more strongly along the cutting line SL, further delaying or more reliably breaking the resin molded sheet J on the anti-cutter side J2. It can be avoided.

Further, the cutter 1 is a circular blade 1M formed in a thin plate shape, and is a drive mechanism for reciprocating the circular blade 1M from the retracted position K1 outward in the sheet width direction to the advancing position K2 on the opposite side along the cutting line SL. Since the 5 is provided, the position of the cutting edge 11 that cuts the resin molded sheet J when the circular blade 1M moves from the retracting position K1 to the advancing position K2, and the circular blade 1M retracts from the advancing position K2 for the next cutting. The position of the cutting edge 11 that cuts the resin molded sheet J when moving to the position K1 can be separated into different positions, and the durability of the cutting edge 11 can be improved. As a result, when the resin molded sheet J having the plurality of heat-molded resin molded products JS is cut to a predetermined length, the generation of cracks and chips can be further reduced or avoided for a longer period of time.

Further, according to the present embodiment, the holding base 4 is connected to the fixed portion 53 of the drive mechanism 5, and the cutter 1 is connected to the movable portion 51 of the drive mechanism 5 via the grip bracket 52 so as to be adjustable in height. Therefore, by adjusting the height of the grip bracket 52 with respect to the movable portion 51, the protrusion amount α of the cutting edge where the cutting edge 11 of the cutter 1 protrudes from the contact portion 41 with respect to the resin molded sheet J in the holding table 4 can be easily reduced. Can be adjusted to. Therefore, the biting amount of the cutting edge 11 of the cutter 1 capable of optimally cutting the resin molded sheet J can be appropriately adjusted according to the plate thickness of the resin molded sheet J and the like. As a result, it is possible to easily reduce or avoid cracking and generation of chips during cutting for a plurality of types of resin molded sheets J having different plate thicknesses and the like.

Further, according to the present embodiment, on the holding table 4, a standing wall portion 43 standing upward from the abutting portion 41 in contact with the resin molded sheet J is formed with a predetermined width along the movement locus of the grip bracket 52. Since the vertical wall portion 43 is formed with the operation notch 433 of the grip bracket 52 corresponding to the forward position K2 or the backward position K1 of the cutter 1, the cutter 1 having the operation notch 433 formed thereof. At the forward position K2 or the backward position K1, the gripping bracket 52 can be operated to easily attach / detach the cutter 1 or change the cutting position of the cutting edge 11. In this case, it is not necessary to remove the holding base 4 from the fixing portion 53 of the drive mechanism 5. Therefore, the cutter 1 can be replaced and the position of the cutting edge 11 to be cut can be quickly changed at a required time while observing the cutting state of the resin molded sheet J. As a result, it is possible to prevent the generation or increase of cracks and chips due to the wear and tear of the cutting edge 11.

Further, according to the present embodiment, the protrusions 211B that bite into the resin molded sheet J are formed on the contact portion 21B that abuts on the resin molded sheet J of the cradle 2B along the cutting line SL, so that the cutter is formed. When 1 cuts the resin molded sheet J, the protrusion 211B bites into the resin molded sheet J, so that the pedestal 2B and the holding table 4 restrain the resin molded sheet J even more strongly along the cutting line SL. Can be done. Further, when the protrusion 211B bites into the resin molded sheet J, the contact area of the pedestal 2B in contact with the resin molded sheet J increases, and the heat amount of the heated pedestal 2B is delayed by the cutting edge 11 of the cutter 1. It can be quickly transmitted to the anti-cutter side J2 of the resin molded sheet J that bites into the resin. As a result, while the pedestal 2 and the holding table 4 restrain the resin molded sheet J more strongly along the cutting line SL, the anti-cutter side J2 of the resin molded sheet J is quickly softened, and the high speed of the resin molded sheet J is obtained. It is possible to further reduce or avoid the generation of cracks and chips in cutting.

INDUSTRIAL APPLICABILITY The present invention can be used as a resin-molded sheet cutting device for cutting a resin-molded sheet having a plurality of heat-molded resin-molded products to a predetermined length.

1 Cutter 1M Circular blade 2, 2B Receiving stand 3 Heating device 3H Heater device 4 Holding stand 5 Drive mechanism 7 Elevating device 10, 10B Resin molded sheet cutting device 11 Cutting edge 21, 21B Contact part 22 Cutting groove 23 Support frame member 41 Contact part 42 Connecting part 43 Standing wall part 51 Movable part 52 Grip bracket 53 Fixed part 211B Protruding part 231 Widening part 231S Side wall surface 232 Both ends 433 Operation notch K1 Retracting position K2 Forwarding position K3 Holding position K4 Opening position JS Product J Resin molded sheet SL cutting line

Claims (7)

A cutting groove is formed in the width direction of the sheet in which the cutting edge is inserted into contact with a cutter having a wedge-shaped cutting edge and a resin molding sheet having a plurality of heat-molded resin molded products arranged opposite to the cutter. A resin-molded sheet cutting device having a pedestal and a cutter that cuts the resin-molded sheet in contact with the pedestal at a position of the cutting groove to a predetermined length.
A heating device for heating the pedestal is provided in the vicinity of the pedestal or the pedestal.
At a position facing the pedestal, a holding pedestal for sandwiching the resin molded sheet with the pedestal across the cutting line of the cutter is provided .
A resin-molded sheet cutting device , wherein a protrusion that bites into the resin-molded sheet is formed along a cutting line at a contact portion of the pedestal that comes into contact with the resin-molded sheet. A cutting groove is formed in the width direction of the sheet in which the cutting edge is inserted into contact with a cutter having a wedge-shaped cutting edge and a resin molding sheet having a plurality of heat-molded resin molded products arranged opposite to the cutter. A resin-molded sheet cutting device having a pedestal and a cutter that cuts the resin-molded sheet in contact with the pedestal at a position of the cutting groove to a predetermined length.
A heating device for heating the pedestal is provided in the vicinity of the pedestal or the pedestal.
At a position facing the pedestal, a holding pedestal for sandwiching the resin molded sheet with the pedestal across the cutting line of the cutter is provided .
The heating device is provided with a predetermined heating time from the time when the pedestal and the holding table sandwich the resin molded sheet until the cutting action by the cutter is started.
A resin-molded sheet cutting apparatus characterized in that, among the resin-molded sheets having the same plate thickness, the larger the thermal conductivity, the longer the heating time than the one having a smaller thermal conductivity . In the resin molded sheet cutting apparatus according to claim 1 or 2 .
The pedestal is provided with a support frame member in which a widening portion for supporting the abutting portion abutting on the resin molded sheet is formed at least within the range of the sheet width.
At both ends of the support frame member, the holding position where the pedestal is close to the holding table to hold the resin molded sheet and the pedestal are separated from the holding table to pass the resin molded sheet. A resin molded sheet cutting device characterized in that an elevating device for moving the cradle up and down is connected to the open position. In the resin molded sheet cutting apparatus according to claim 3 ,
The heating device is a plate-shaped heater device, and is a resin molded sheet cutting device characterized in that the heater device is adhesively fixed to a side wall surface of a widened portion of the support frame member. In the resin molded sheet cutting apparatus according to any one of claims 1 to 4 .
The cutter is a circular blade formed in a thin plate shape, and is characterized by having a drive mechanism for reciprocating the circular blade from a retracted position outward in the sheet width direction to a forward position on the opposite side along a cutting line. Resin molded sheet cutting device. In the resin molded sheet cutting apparatus according to claim 5 .
The holding base is connected to a fixed portion of the drive mechanism, and the cutter is height-adjustably connected to a movable portion of the drive mechanism via a grip bracket. .. In the resin molded sheet cutting apparatus according to claim 6 ,
On the holding table, a standing wall portion that rises upward from the abutting portion that abuts on the resin molded sheet is formed with a predetermined width along the movement locus of the gripping bracket, and the cutter advances on the standing wall portion. A resin molded sheet cutting device characterized in that an operation notch portion of the gripping bracket is formed corresponding to a position or a retracted position.

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