JP2023007144A - Resin molded sheet cutting device - Google Patents

Abstract

To provide a resin molded sheet cutting device which can reduce or avoid generation of cracks and chips with a simple structure when cutting a resin molded sheet, which has a plurality of thermoformed resin moldings, to a prescribed length.SOLUTION: A resin molded sheet cutting device 10 comprises: a cutter 1 of which a tip 11 is formed into a wedge shape; and a cradle 2 which is so located as to face the cutter, and contacts a resin molded sheet J having a plurality of thermoformed resin moldings JS, and in which a cut groove 22, in which the tip is inserted, is formed in a sheet width direction. In the cutting device, the cutter cuts the resin molded sheet, which is brought into contact with the cradle, to a prescribed length at a position of the cut groove. The device comprises a heater 3 for heating the cradle on the cradle or near the cradle, and a holding base 4 which sandwiches the resin molded sheet between itself and the cradle with a cut line SL of the cutter therebetween at a position facing the cradle.SELECTED DRAWING: Figure 4B

Description

TECHNICAL FIELD The present invention relates to a resin-molded sheet cutting apparatus, and more particularly to a resin-molded sheet cutting apparatus for cutting a resin-molded sheet having a plurality of heat-molded resin-molded products into a predetermined length.

In general, resin molded products used for food trays and the like are made by unwinding a thermoplastic resin sheet wound into a coil, and heating and softening the unwound resin sheet with a heater or the like. After that, it is formed into a predetermined shape (hereinafter also referred to as “heat forming”) using a mold capable of vacuum forming, pressure forming, or the like. The 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. available molds are often used.

In this case, it is possible to continuously cut the outer peripheral edges of the individual resin molded products following the heat molding, but the cutting apparatus becomes large-scaled, and the equipment cost tends to increase. Therefore, using a resin-molded sheet cutting device for cutting the resin-molded sheet in the sheet width direction, the resin-molded sheet having a plurality of heat-molded resin-molded products is cut into a predetermined length, and the cut resin-molded sheet is obtained. Once stacked and stored, the outer periphery of each resin molded product is cut with a tandem cutting device that cuts individually in the stacked state or in the state of peeling off one by one, and resin molding as a product It may adopt a method of forming a product.

For example, Patent Literature 1 discloses a resin-molded sheet cutting apparatus that cuts a resin-molded sheet having a plurality of heat-molded resin-molded products into a predetermined length. Specifically, as shown in FIG. 9, a heater 102 for heating a thermoplastic resin sheet 101, a mold 103 for molding the resin sheet 101 that has been softened by heating with the heater 102, and a mold. A thermoforming machine 100 is disclosed that includes a sizing cutter (resin molded sheet cutting device) 104 that cuts the resin molded sheet 101a molded in 103 to a predetermined size. Here, the sizing cutter 104 has a wedge-shaped cutter 104a for cutting the resin molded sheet 101a. Cut to length. The sizing cutter 104 is provided with a receiving table 104b on which the resin-molded sheet 101a abuts along the sheet width direction at a position facing the cutter 104a.

JP-A-2001-293774

However, the sizing cutter (resin-molded sheet cutting device) 104 disclosed in the above-mentioned Patent Document 1 has a configuration in which a 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) 101a1 of the resin-molded sheet 101a, the counter-cutter-side (lower end) 101a2 of the resin-molded sheet 101a faces the cutter 104a. It is pushed out in the horizontal direction orthogonal 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 is such that the cutter side (upper end) 101a1 of the resin molded sheet 101a, which the cutting edge 104a1 bites first, is crushed in a wedge shape and cut. It acts as a tensile force P3 that horizontally expands the anti-cutter side (lower end) 101a2 of the resin molded sheet 101a into which the cutting edge 104a1 bites later via the pressing force P2 that expands obliquely outward.

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 it reaches its elongation limit, the anti-cutter side of the resin-molded sheet 101a is stretched. (Lower end) 101a2 is broken. When the counter-cutter side (lower end) 101a2 of the resin-molded sheet 101a is broken, cracks and minute chips are generated from the broken surface 101a3. The crack may reach the resin molded product 101b, and the chips may adhere to the resin molded product 101b. As a result, problems such as disposal of the resin molded product 101b with cracks, scratches on the resin molded product 101b due to chips, and a decrease in productivity due to cleaning and removal of chips may arise.

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

In order to achieve the above object, a resin molded sheet cutting apparatus according to the present invention has the following configuration.
(1) 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, and a cutting groove into which the cutting edge is inserted are formed so as to have a width of the sheet. a pedestal formed in a direction, wherein the cutter cuts the molded resin sheet in contact with the pedestal to a predetermined length at the position of the cutting groove,
A heating device for heating the cradle is provided on the cradle or in the vicinity of the cradle,
It is characterized in that a holding table is provided at a position facing the receiving table for holding the resin molded sheet between itself and the receiving table with the cutting line of the cutter interposed therebetween.

In the present invention, a heating device for heating the cradle is provided on the cradle or near the cradle. Since the holder is sandwiched between the two, the temperature of the holder heated by the heating device can be raised to a temperature equal to or higher than the temperature of the holder from which a certain amount of heat transferred from the holder is radiated. Therefore, when cutting a resin-molded sheet having a plurality of heat-molded resin-molded products into a predetermined length, the cutter side of the resin-molded sheet, which is in contact with the holding table and the cutting edge of the cutter bites first, cuts into the cradle and the sheet. The side opposite to the cutter of the resin-molded sheet, which abuts and is later bitten by the cutting edge of the cutter, can be heated more along the cutting line of the cutter. Therefore, while suppressing drooping due to excessive softening of the cutter side of the resin-molded sheet, which the cutting edge of the cutter bites first, the opposite side of the resin-molded sheet, which the cutting edge of the cutter bites later, is more along the cutting line. It softens a lot and can improve the limit of elongation to break.

In addition, at a position facing the cradle, there is provided a cradle for clamping the resin molded sheet with the cradle across the cutting line of the cutter. The holding table can restrain the resin-molded sheet along the cutting line. Therefore, when the cutting edge of the wedge-shaped cutter bites into the cutter side of the resin-molded sheet, the tension that expands the side of the resin-molded sheet opposite to the cutter that the cutter edge bites into in the horizontal direction perpendicular to the cutting line. The force can be canceled by the restraining force (frictional force) that the cradle and holder restrain the resin molded sheet along the cutting line.

Therefore, the side of the resin-molded sheet opposite to the cutter is softened along the cutting line to improve the limit of elongation leading to breakage. By canceling the tensile force that causes the sheet to expand in the horizontal direction, it is possible to delay or avoid breakage of the molded resin sheet on the side opposite to the cutter. As a result, when cutting a resin-molded sheet having a plurality of heat-molded resin-molded articles into a predetermined length, it is possible to reduce or avoid the generation of cracks and chips due to breakage of the resin-molded sheet on the side opposite to the cutter.

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

(2) In the resin molded sheet cutting device described in (1),
The cradle includes a support frame member having a widened portion that supports the abutting portion that abuts on the resin-molded sheet and has a width that is at least within the range of the seat width,
At both ends of the support frame member, there are provided a holding position where the cradle is close to the holding base and holds the resin-molded sheet therebetween, and a holding position where the cradle is spaced apart from the holding base and allows the resin-molded sheet to pass therethrough. A lifting device is connected between the open position and the lifting device for moving the receiving table up and down.

In the present invention, the cradle is provided with a support frame member in which the widened portion for supporting the abutting portion that abuts against the resin molded sheet is formed at least within the range of the seat width. An elevating device for moving the cradle up and down is connected between a nipping position where the cradle is close to the cradle and clamps the resin-molded sheet, and an open position where the cradle is separated from the cradle and allows the resin-molded sheet to pass through. Therefore, in order to cut the resin-molded sheet, the lifting device is operated, and when the cradle comes close to the holding table and sandwiches the resin-molded sheet, the contact portion of the cradle that contacts the resin-molded sheet bends. The amount can be reduced by the stiffness of the widening formed at least in the area of the seat width. Therefore, the cradle and the holding table restrain the resin-molded sheet substantially uniformly along the cutting line, and the generation of cracks and chips during cutting can be more stably reduced or avoided.

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

In the present invention, the heating device is a plate-shaped heater device, and the heater device is adhesively fixed to the side wall surface of the widened portion of the support frame member. Thus, the contact portion of the cradle that contacts the resin-molded sheet can be heated to a substantially uniform temperature. Therefore, it is possible to greatly suppress variations 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.

In addition, since the heater device is adhesively fixed to the side wall surface of the widened portion of the support frame member, the amount of heat generated by the heater device can be stored in the widened portion formed in at least the seat width range of the support frame member. Therefore, the amount of heat stored in the widened portion is added to the amount of heat generated by the heater device, so that the contact portion of the cradle that contacts the molded resin sheet can be rapidly heated to a predetermined temperature. As a result, while contributing to the energy saving of the heater device, the cutting speed of the resin-molded sheet can be improved, or the cycle time during cutting can be shortened, and the generation of cracks and chips during high-speed cutting of the resin-molded sheet can be reduced or avoided. can be made

(4) In the resin molded sheet cutting device described in any one of (1) to (3),
The cutter is a circular blade formed in a thin plate shape, and is provided with a drive mechanism that reciprocates the circular blade from a retracted position on the sheet width direction outer side to an advanced position on the opposite side along the cutting line. and

In the present invention, since the cutter is a circular blade formed into a thin plate, when the cutting edge of the cutter bites into the cutter side of the resin-molded sheet, the cutter side of the resin-molded sheet, which the cutter edge bites into first, is wedged. It is possible to reduce the tensile force that horizontally expands the opposite side of the resin-molded sheet, which the cutting edge of the cutter bites into later, in the horizontal direction. Therefore, the cradle and the holding table can more strongly restrain the resin-molded sheet along the cutting line, and breakage of the resin-molded sheet on the side opposite to the cutter can be further delayed or avoided more reliably.

Further, the cutter is a circular blade formed in a thin plate shape, and has a drive mechanism for reciprocating the circular blade along the cutting line from a retracted position on the sheet width direction outer side to an advanced position on the opposite side. The position of the blade edge that cuts the resin-molded sheet when the blade moves from the retracted position to the forward position, and the blade edge that cuts the resin-molded sheet when the circular blade moves from the forward position to the retracted position for the next cutting. The position can be divided 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 articles is cut into a predetermined length, generation of cracks and chips can be reduced or avoided for a longer period of time.

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

In the present invention, the holding table is connected to the fixed portion of the drive mechanism, and the cutter is connected to the movable portion of the drive mechanism via the gripping bracket so that the height of the gripping bracket relative to the movable portion is adjustable. By adjusting the depth, it is possible to easily adjust the amount of protrusion of the cutting edge of the cutter from the contact portion of the holding base with respect to the resin-molded sheet. Therefore, depending on the thickness of the resin-molded sheet and the like, it is possible to appropriately adjust the biting amount of the cutting edge of the cutter capable of optimally cutting the resin-molded sheet. As a result, it is possible to easily reduce or avoid the generation of cracks and chips when cutting a plurality of types of resin molded sheets having different thicknesses.

(6) In the resin molded sheet cutting device described in (5),
The holding base is formed with an upright wall portion that rises upward from a contact portion that abuts on the resin-molded sheet and has a predetermined width along the moving locus of the gripping bracket. A notch for operation of the gripping bracket is formed corresponding to the position or retracted position.

In the present invention, the holding base is formed with an upright wall portion that rises upward from the abutting portion that abuts on the resin-molded sheet and has a predetermined width along the moving locus of the gripping bracket. Since the operation cutouts of the gripping bracket are formed corresponding to the position or the retracted position, the gripping bracket can be easily operated by operating the cutter at the forward position or the retracted position where the operation cutouts are formed. The cutter can be attached or 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 state of cutting the resin-molded sheet, the cutter can be replaced or the position of the cutting edge to be cut can be quickly changed when necessary. As a result, it is possible to prevent the occurrence or increase of cracks and chips due to wear and chipping of the cutting edge.

(7) In the resin molded sheet cutting device described in any one of (1) to (6),
The abutting portion of the cradle that abuts against the resin-molded sheet is formed with a projection that bites into the resin-molded sheet along the cutting line.

In the present invention, the abutting portion of the cradle that abuts on the resin-molded sheet is formed along the cutting line with a protrusion that bites into the resin-molded sheet. By biting into the resin-molded sheet, the receiving base and the holding base can more strongly restrain the resin-molded sheet along the cutting line. In addition, as the protrusions bite into the resin-molded sheet, the contact area of the cradle with the resin-molded sheet increases, and the heat of the heated cradle is absorbed by the cutting edge of the resin-molded sheet with a delay. It can be transmitted quickly to the side. As a result, while the cradle and the holding base restrain the resin-molded sheet more strongly along the cutting line, the side of the resin-molded sheet opposite to the cutter is quickly softened, and cracks and shavings are generated during high-speed cutting of the resin-molded sheet. Occurrence can be further reduced or avoided.

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

1 is a schematic configuration diagram of a thermoforming machine including a resin-molded sheet cutting device according to one aspect of the present embodiment; FIG. FIG. 2 is a schematic diagram of a resin-molded sheet cutting device according to one aspect of the present embodiment, which is used in the thermoforming machine shown in FIG. 1 ; It is an A arrow side view shown in FIG. 4 is a cross-sectional view taken along the line BB shown in FIG. 3; FIG. 4B is an enlarged cross-sectional view of the X section shown in FIG. 4A. FIG. FIG. 4 is a detailed cross-sectional view of the state of cutting at the C portion shown in FIG. 3; FIG. 6 is a cross-sectional view taken along line DD shown in FIG. 5; FIG. 4 is a detailed cross-sectional view of the state of cutting at the portion C shown in FIG. 3 in a modified example of the resin-molded sheet cutting device. 8 is a cross-sectional view taken along line EE shown in FIG. 7; FIG. 1 is a schematic cross-sectional view of a thermoforming machine disclosed in Patent Document 1; FIG. FIG. 10 is a cross-sectional view of a main part showing a state of cutting in the sizing cutter shown in FIG. 9;

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

<Construction of thermoforming machine including this resin molded sheet cutting device>
First, the configuration of a thermoforming machine including this resin-molded sheet cutting apparatus will be briefly described with reference to FIG. FIG. 1 shows a schematic configuration diagram of a thermoforming machine including a resin-molded sheet cutting device according to one aspect of the present embodiment.

As shown in FIG. 1, a thermoforming machine 200 including this resin-molded sheet cutting apparatus includes a sheet rewinding stage (S1) and a sheet heating stage ( S2), a forming stage (S3), a sheet cutting stage (S4), and a stacking stage (S5). Here, the sheet rewinding stage (S1) is a stage for intermittently rewinding the thermoplastic resin sheet JC wound in a roll. Various resin sheets JC such as amorphous polystyrene (PS), crystalline polypropylene (PP), and polyethylene terephthalate (PET) can be used as the thermoplastic resin sheet JC depending on the application. . The rewound resin sheet JC is temporarily put on standby before the next sheet heating stage (S2) in a state of hanging down in a loop shape for reasons such as removing curling.

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 is determined according to the type, thickness, molding shape, etc. of the resin sheet JC so as to avoid wrinkles, cracks, etc. of the resin sheet JC in the next molding stage (S3) and enable proper heat molding. , set accordingly. Further, the next molding stage (S3) is a stage in which the resin sheet JC heated to a predetermined temperature is heat-molded into a predetermined shape using a mold (not shown) capable of vacuum molding, pressure molding, or the like. . In the molding stage (S3), for example, in addition to food trays, resin moldings JS of various shapes can be formed. Usually, the mold has a plurality of molding surfaces of the same shape so that a plurality of the same resin moldings JS can be molded in one heat molding. Here, the mold is formed so that three rows of the resin molded products JS can be arranged in the sheet width direction, and two rows of the resin molded products JS can be arranged in the sheet feed direction. 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, then the mold is opened and the product is sent to the next sheet cutting stage (S4).

The next sheet cutting stage (S4) is a stage for cutting the resin-molded sheet J having a plurality of resin-molded articles JS heat-molded in the molding stage (S3) into predetermined lengths. In the sheet cutting stage (S4), using the resin molded sheet cutting apparatuses 10 and 10B according to the present embodiment, which will be described later, for example, at the boundaries of the plurality of resin molded products JS molded at once in the molding stage (S3) , 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 loading device for loading the resin molded sheet J into the resin molded sheet cutting devices 10 and 10B. is provided.

The stacking stage (S5) is a stage for temporarily storing a plurality of resin-molded sheets J cut by the sheet cutting stage (S4) stacked vertically. A plurality of laminated resin-molded sheets J are conveyed to a separately provided cutting device, and the outer peripheral edge of the resin-molded article JS is cut to form a resin-molded article JS as a product.

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

As shown in FIGS. 2 to 6, this resin-molded sheet cutting apparatus 10 includes a cutter 1 having a wedge-shaped cutting edge 11, and a plurality of resin molded products JS which are arranged to face the cutter 1 and are heat-molded. and a cutting groove 22 formed in the sheet width direction into which the cutting edge 11 is inserted, and the cutter 1 cuts the resin-molded sheet J abutting on the cradle 2. A resin-molded sheet cutting device 10 for cutting a resin-molded sheet to a predetermined length L (see FIG. 1) at the position of a groove 22. FIG. Here, the cutter 1 may be a linear blade (a so-called Thompson blade or the like) or a circular blade, which will be described later, as long as the cutting edge 11 is formed in a wedge shape. However, in the case of a straight blade, it is preferable to reduce the cutting load of the resin molded sheet J by providing a shear angle or the like on the cutting edge 11 .

Further, a heating device 3 for heating the cradle 2 is provided on the cradle 2 or in the vicinity of the cradle 2, and a resin molded sheet J is placed at a position facing the cradle 2 with the cutting line SL of the cutter 1 interposed therebetween. A holding base 4 is provided to be clamped between the receiving base 2. - 特許庁The holding base 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 have substantially the same size as the groove width of the cutting groove 22 of the receiving table 2 . 2 and 3, the cradle 2 is vertically movable with respect to the cutter 1 and the holder 4, but the cutter 1 and the holder 4 are vertically movable with respect to the holder 2. may be formed to 3, 4A, and 4B, the heating device 3 is attached to the cradle 2 that moves up and down, and the heating device 3 directly heats the cradle 2. 2, and the heating device 3 may heat the cradle 2 indirectly.

Then, the temperature of the cradle 2 heated by the heating device 3 rises to a temperature equal to or higher than the temperature of the cradle 4 from which a certain amount of heat transferred from the cradle 2 is radiated. Therefore, when the cutter 1 cuts the resin-molded sheet J having a plurality of heat-molded resin-molded products JS to a predetermined length, the cutting edge 11 of the cutter 1 abuts against the holder 4 and bites ahead of the resin molding. From the cutter side (upper end) J1 of the sheet J, the counter-cutter side (lower end) J2 of the resin-molded sheet J, which abuts on the cradle 2 and is later bitten by the cutting edge 11 of the cutter 1, is moved along the cutting line SL of the cutter 1. can heat more.

In this case, the cutter side J1 of the resin-molded sheet J, which is in contact with the holder 4 and into which the cutting edge 11 of the cutter 1 precedes, is prevented from softening excessively due to the temperature rise. Therefore, the punching sag ND due to excessive softening of the cutter side J1 of the resin molded sheet J can be suppressed. On the other hand, when the temperature of the cradle 2 rises to a temperature equal to or higher than the temperature of the holder 4, the side J2 opposite to the cutter of the resin molded sheet J which abuts the cradle 2 and which the cutting edge 11 of the cutter 1 bites with a delay. , softens more along the cutting line SL and improves the limit of elongation to break.

By the way, the pressing force Q1 of the cutter 1 against the resin-molded sheet J at the time of cutting is such that the cutter side (upper end) J1 of the resin-molded sheet J, which the cutting edge 11 bites first, is crushed like a wedge and cut diagonally outward. It acts as a tensile force Q3 that horizontally expands the anti-cutter side (lower end) J2 of the resin molded sheet J into which the cutting edge 11 bites later, via the pressing force Q2 that pushes it outward.

With respect to this tensile force Q3, a holding table 4 is provided at a position facing the receiving table 2 to clamp the resin molded sheet J with the receiving table 2 across the cutting line SL of the cutter 1. When the cutter 1 cuts the resin-molded sheet J, the receiving table 2 and the holding table 4 constrain the resin-molded sheet J along the cutting line SL. When the wedge-shaped cutting edge 11 of the cutter 1 bites into the cutter side J1 of the resin-molded sheet J due to the restraining force R2 (frictional force) restrained by the receiving base 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 non-cutter side J2 of the resin molded sheet J that is bitten in later 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 molded sheet J while softening the non-cutter side J2 of the resin molded 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 horizontally expands the anti-cutter side J2 of the resin molded sheet J, breakage of the anti-cutter side J2 of the resin molded sheet J can be delayed or avoided. As a result, when the resin-molded sheet J having a plurality of heat-molded resin-molded products JS is cut into a predetermined length, cracks and chips due to breakage of the resin-molded sheet J on the side opposite to the cutter can be easily prevented. can be reduced or avoided. Therefore, according to the present embodiment, when the resin-molded sheet J having a plurality of heat-molded resin-molded products JS is cut into a predetermined length, 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 (opposite side of the cutter) J2 of the resin-molded sheet J heated by the cradle 2 is, for example, higher than the glass transition temperature of the resin-molded sheet J. It is preferably lower than the molding temperature when heat molding the product JS. By heating the molded resin sheet J to a temperature higher than the glass transition temperature, the elongation limit leading to breakage is improved, and by heating the resin molded sheet J to a temperature lower than the molding temperature, deformation, etc., when the cradle and the holder are held between them is reduced or avoided. This is to let

In addition, since the resin molded sheet J does not have free electrons unlike metals, it generally has a lower thermal conductivity than metals. Therefore, after the resin-molded sheet J is sandwiched between the cradle 2 and the holding table 4, a predetermined heating time is required until the cutting action by the cutter 1 is started. It is preferable to adjust the heating time according to the plate thickness, thermal conductivity, and the like of the resin-molded sheet J. In addition, among 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. , is more preferable in terms of reducing or avoiding the generation of cracks and chips during cutting. In experiments conducted by the present applicant, for example, the heating time for polyethylene terephthalate (PET) with a thermal conductivity of about 0.3 (W/mK) was reduced to polystyrene (PS) with a thermal conductivity of about 0.1 (W/mK). ), it is preferable to lengthen the heating time.

Next, in the resin-molded sheet cutting apparatus 10, the support frame member 23 having the widened portion 231 for supporting the contact portion 21 that contacts the resin-molded sheet J is formed at least within the range of the sheet width. At both end portions 232 of the support frame member 23, there are provided a clamping position K3 where the cradle 2 is close to the holding table 4 to clamp the resin molded sheet J, and a clamping position K3 where the cradle 2 is spaced apart from the holding table 4 to hold the resin molded sheet J. It is preferable that an elevating device 7 for moving the cradle 2 up and down is connected between the open position K4 through which J is passed. Here, as shown in FIGS. 2 and 3, the lifting device 7 uses the fluid pressure cylinder device 7S in which the cylinder rod 71 extends upward from the cylinder case 72. No need to limit.

As shown in FIGS. 3, 4A, and 4B, the support frame member 23 is formed to have a substantially rectangular cross section and extends horizontally to the outside of the seat width. A thin portion 234 having a thickness equal to or greater than the groove width of the cut groove 22 is formed at the upper end portion of the support frame member 23, and the cradle 2 is divided into two on the upstream side and the downstream side with the cut groove 22 therebetween. , are fastened with the thin portion 234 interposed therebetween. The receiving table 2 is formed with a stepped portion 24 that transmits a vertical load to the upper end surface of the thin portion 234 . A widened portion 231 is integrally formed at the lower end portion of the support frame member 23 so as to widen downward at least within the range of the seat width. A minute gap is formed between the upper end surface of the widened portion 231 and the lower end surface 25 of the receiving table 2 . The amount of width increase of the widened portion 231 in the vertical direction is substantially uniform in the seat width direction.

As shown in FIGS. 2 and 3, the resin-molded sheet cutting apparatus 10 includes a base portion 61 having a predetermined thickness and extending in the sheet width direction, and both ends 61T of the base portion 61 that stand upward. and an upper frame portion 622 connecting the upper ends of the side wall portions 62 to each other. Both end portions 232 of the support frame member 23 are connected to the distal end portion of the cylinder rod 71 via connection brackets 233, and the cylinder case 72 is fastened to both ends 61T of the base portion 61. As shown in FIG.

A pair of guide bushes 73 are fixed to the base portion 61 with a cylinder case 72 interposed therebetween as a guide member for the fluid pressure cylinder device 7S. A pair of guide rods 74 connected to the connection bracket 233 are respectively inserted through the guide bushes 73 to increase the positional accuracy of the cradle 2 at the clamping position K3.

From the above configuration, when the lifting device 7 is operated and the receiving table 2 approaches the holding table 4 to sandwich the resin molded sheet J, the amount of deflection of the contact portion 21 in contact with the resin molded sheet J on the receiving table 2 is can be reduced by the rigidity of the widened portion 231 formed at least in the range of the seat width. Therefore, the cradle 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 more stably reduced or avoided. can.

Further, after cutting the resin molded sheet J, the lifting device 7 is operated to move the receiving table 2 to the open position K4 away from the holding table 4 . As a result, the resin-molded sheet J after being cut can be passed between the receiving table 2 and the holding table 4 in the feed direction, and the resin-molded sheet J can be conveyed to the next cutting position. A mounting table 64 for mounting a resin molded sheet J cut to a predetermined length L 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, a guide belt 65 is provided on the upstream side of the cradle 2 so that the resin-molded sheet J to be conveyed can pass through without interfering with the cradle 2 . The resin-molded sheet J can slide on the upper surface of the guide belt 65 to move.

Next, as shown in FIGS. 3, 4A, and 4B, the heating device 3 is a heater device 3H formed in a plate shape. 3H is preferably 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 it is not necessarily limited to the rubber heater 3R. .

With the above configuration, the plate-shaped heater device 3H can heat the cutting groove 22 side of the contact portion 21 that contacts the resin-molded sheet J on the cradle 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 greatly suppressed. Also, the amount of heat of the heater device 3H is transferred from the widened portion 231 to the cradle 2 via the thin portion 234 . Therefore, the temperature of the cradle 2 rises more stably on the cut groove 22 side adjacent to the thin 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 widened portion 231 of the support frame member 23, the amount of heat generated by the heater device 3H is formed at least within the range of the seat width of the support frame member 23. Heat is accumulated in the widened portion 231 . Therefore, the amount of heat stored in the widened portion 231 is added to the amount of heat generated by the heater device 3H, and the contact portion 21 of the cradle 2 that contacts the resin molded sheet J 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 can be improved, or the cycle time during cutting can be shortened, and the generation of cracks and chips during high-speed cutting of the resin-molded sheet J can be prevented. can be reduced or avoided.

Next, the cutter 1 is preferably a circular blade 1M formed like a thin plate. It should be noted that the 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-molded sheet J, the cutting edge 11 of the cutter 1 (1M) pushes the cutter-side J1 of the resin-molded sheet J, which it bites first, into a wedge shape. The crushing amount to be crushed is reduced. Then, it is possible to reduce the tensile force Q3 that horizontally expands the counter-cutter side J2 of the resin molded sheet J into which the cutting edge 11 of the cutter 1 (1M) bites with a delay. Therefore, the receiving table 2 and the holding table 4 can more strongly restrain the resin-molded sheet J along the cutting line SL. As a result, breakage of the molded resin sheet J on the counter-cutter side J2 can be further delayed or avoided more reliably.

Further, the cutter 1 is a circular blade 1M formed in a thin plate shape, and a drive mechanism that reciprocates the circular blade 1M along the cutting line SL from a retracted position K1 on the sheet width direction outer side to an advanced position K2 on the opposite side. 5 is preferred. 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 retracted position K1 to the forward position K2, and the position of the circular blade 1M from the forward position K2 to the retracted 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 to a different position, and the durability of the cutting edge 11 is improved. As a result, it is possible to reduce or avoid generation of cracks and chips for a longer period of time when cutting the resin molded sheet J having a plurality of heat-molded resin molded articles JS into a predetermined length.

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 gripping bracket 52 so as to be height-adjustable. Here, as shown in FIGS. 2 to 4A, the drive mechanism 5 includes a fixing portion 53 extending in the seat width direction and having a substantially rectangular cross section, and a fixing portion 53 extending in the seat width direction. Although the rodless cylinder 5S provided with the movable portion 51 formed to be reciprocally movable is used, it is not necessarily limited to the rodless cylinder 5S.

The gripping bracket 52 includes a first bracket 521 that is screwed to the movable portion 51 and a second bracket 522 that is screwed to the first bracket 521 and holds the circular blade 1M therebetween. I have. The screw members for screwing the first bracket 521 and the second bracket 522 include the first screw 12 that is inserted through the center of the circular blade 1M and fastened, and a plurality of screw members that are fastened outside the outer peripheral edge of the circular blade 1M. A second screw 13 is provided. A push screw 523 for moving the first bracket 521 up and down along a 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 while the circular blade 1M is sandwiched between the first bracket 521 and the second bracket 522. .

From the above configuration, by adjusting the height of the gripping bracket 52 with respect to the movable portion 51, the protrusion amount α of the blade edge 11 of the cutter 1 protruding from the contact portion 41 of the holding base 4 with respect to the resin molded sheet J is can be easily adjusted. Therefore, depending on the thickness of the resin-molded sheet J, etc., 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. As a result, it is possible to easily reduce or avoid the generation of cracks and shavings during cutting of a plurality of types of resin molded sheets J having different thicknesses.

Next, the holding base 4 is formed with a standing wall portion 43 that rises upward from a contact portion 41 that contacts the resin molded sheet J and has a predetermined width along the movement locus of the gripping bracket 52 . , the operation notch 431 of the gripping bracket 52 is preferably formed corresponding to the forward position K2 or the retracted position K1 of the cutter 1 .

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

With the above configuration, the fastening screw of the gripping bracket 52 can be unfastened without removing the holding base 4 from the fixing portion 53 of the drive mechanism 5 at the forward position K2 or the retracted position K1 of the cutter 1 in which the operation notch 431 is formed. The cutter 1 can be easily attached and detached or the cutting position of the cutting edge 11 can be changed easily by operating. Therefore, while observing the state of cutting the resin molded sheet J, the cutter 1 can be replaced or the position of the cutting edge 11 can be quickly changed when necessary. As a result, it is possible to prevent the occurrence or increase of cracks and chips due to wear and chipping of the cutting edge 11 . In addition, since the standing wall portion 43 is formed with a predetermined width along the moving locus of the gripping bracket 52, the rigidity of the holding table 4 is made uniform in the sheet width direction, and the heat dissipation and heat storage properties of the holding table 4 are improved. , and the temperature of the holding table 4 can be made uniform in the sheet width direction.

2 and 3, the fixed portion 53 of the drive mechanism 5 (5S) is fixed at both ends 531 in the seat width direction via a screw mechanism having 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 vertically movable. The upper ends of both ball screws 624 are formed with pulleys 626 connected to each other by a chain, and one ball screw 624 is connected to a handle 623 . For example, the height of the holding table 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 direction and amount of protrusion of the resin molded product JS from 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 FL so as to be reciprocally movable in the sheet feeding direction. Specifically, roller support portions 611 to which roller bodies 612 for movement are attached are connected to both ends 61T of the base portion 61 of the apparatus main body 6 . The roller support portion 611 is formed with a nut portion 613 that engages with a ball screw 632 extending in the sheet feeding direction on the base 63 . A rail portion 631 for guiding the roller body 612 in the sheet feeding direction is extended from the base 63, and a driving 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 a drive motor 635 via a drive belt 634 .

As a result, the drive motor 635 is actuated to rotate the ball screw 632 , thereby moving the apparatus main body 63 in the sheet feeding direction via the nut portion 613 engaged with the ball screw 632 . For example, at the start of cutting a lot, the device main body 6 is moved to the forward position in the feeding direction set for each product, and after cutting the end of the resin molded sheet J, it is returned to the cutting position shown in FIG. I do. In subsequent cutting, the resin-molded sheet J having a plurality of heat-molded resin-molded products JS can be cut into a predetermined length L.

(Modification)
Although the resin-molded sheet cutting apparatus 10 according to the present embodiment has been described above in detail, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention. For example, as the present resin-molded sheet cutting device 10B according to the modified example, as shown in FIGS. The portion 211B may be formed along the cutting line SL. The resin-molded sheet cutting apparatus 10B is in common with the above-described resin-molded sheet cutting apparatus 10 except for the configuration described 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 receiving table 2B and the holding table 4 cut the resin-molded sheet J along the cutting line SL. can be bound even more strongly. In addition, since the projection 211B bites into the resin-molded sheet J, the contact area of the cradle 2B with the resin-molded sheet J increases, and the heat amount of the heated cradle 2B is transferred to the cutting edge 11 of the cutter 1 with a delay. The force can be quickly transmitted to the counter-cutter side J2 of the resin molded sheet J that bites.

As a result, while the cradle 2 and the holding table 4 restrain the resin-molded sheet J more strongly along the cutting line SL, the side J2 of the resin-molded sheet J opposite to the cutter is quickly softened, and the resin-molded sheet J is cut at a high speed. Generation of cracks and chips during cutting can be further reduced or avoided. The protrusions 211B may be pyramidal or conical minute protrusions arranged along the cutting line SL, or may be long triangular beads extending along the cutting line SL. Also good. The protrusions 211B of the triangular bead may be arranged singly or in a plurality of rows within the range of the seat width. For example, in the projection 211B of a square pyramid or a triangular bead, when the projection 211B adjacent to the cutting groove 22 bites into the resin-molded sheet J, there is a pressing force R3 that pushes the counter-cutter side J2 of the resin-molded sheet J toward the cutting line SL. works. This pushing force R3 can further delay or avoid breakage of the molded resin sheet J on the side J2 opposite to the cutter.

<Effect>
According to the resin-molded sheet cutting apparatuses 10 and 10B according to the present embodiment described in detail above, the heating device 3 for heating the cradle 2 is provided on the cradle 2 or in the vicinity of the cradle 2 . At a position opposite to , there is provided a holding table 4 for sandwiching the resin molded sheet J with the receiving table 2 across the cutting line of the cutter 1, so that the temperature of the receiving table 2 heated by the heating device 3 is , the temperature can be raised to a temperature equal to or higher than the temperature of the holding table 4 where a certain amount of heat transferred from the receiving table 2 is radiated. Therefore, when cutting the resin-molded sheet J having a plurality of heat-molded resin-molded products JS into a predetermined length, the cutter of the resin-molded sheet J comes into contact with the holder 4 and the cutting edge 11 of the cutter 1 bites in advance. The non-cutter side J2 of the resin-molded sheet J, which abuts on the pedestal 2 and is later bitten by the cutting edge 11 of the cutter 1, can be heated more along the cutting line SL of the cutter 1 than the side J1. Therefore, while suppressing the pull-out sag ND due to excessive softening of the cutter side J1 of the resin-molded sheet J, which the cutting edge 11 of the cutter 1 bites in ahead of, the resin-molded sheet J, which the cutting edge 11 of the cutter 1 bites in later, is anti-cutter. The side J2 can be softened more along the cutting line SL to improve the limit of elongation to break.

Further, at a position facing the receiving table 2, a holding table 4 is provided for sandwiching the resin molded sheet J with the receiving table 2 across the cutting line SL of the cutter 1. When cutting, the receiving table 2 and the holding table 4 can constrain the resin molded sheet J along the cutting line SL. Therefore, when the cutting edge 11 of the cutter 1 formed in a wedge shape bites into the cutter side J1 of the resin molded sheet J, the counter-cutter side J2 of the resin molded sheet J into which the cutting edge 11 of the cutter 1 bites is delayed with respect to the cutting line SL. The tensile force Q3 that expands the resin molded sheet J in the orthogonal horizontal direction can be canceled by the restraining force R2 (frictional force) that restrains the resin molded sheet J along the cutting line SL.

Therefore, while softening the non-cutter side J2 of the resin-molded sheet J along the cutting line SL and improving the elongation limit leading to breakage, when the cutting edge 11 of the cutter 1 bites into the cutter-side J1 of the resin-molded sheet J, the resin By canceling the tensile force Q3 that horizontally expands the counter-cutter side J2 of the molded sheet J, breakage of the counter-cutter side J2 of the resin molded sheet J can be delayed or avoided. As a result, when cutting the resin-molded sheet J having a plurality of heat-molded resin-molded products JS to a predetermined length, the occurrence of cracks and chips due to breakage of the counter-cutter side J2 of the resin-molded sheet J is reduced. or can be avoided.

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

Further, according to the present embodiment, the support frame member 23 having the widened portion 231 for supporting the contact portion 21 that contacts the resin-molded sheet J is formed in at least the range of the seat width. At both ends 232 of the frame member 23, there are sandwiching positions K3 where the cradle 2 is close to the holding table 4 to sandwich the resin-molded sheet J, and a clamping position K3 where the cradle 2 is separated from the holding table 4 and passes the resin-molded sheet J. Since the elevating device 7 for moving the cradle 2 up and down is connected between the opening position K4 and the open position K4 where the cradle 2 is opened, the hoisting device 7 is operated to cut the resin molded sheet J, and the cradle 2 is moved to the holding base 4. When the resin-molded sheet J is sandwiched closely, the bending amount of the contact portion 21 of the receiving table 2 that contacts the resin-molded sheet J is reduced by the rigidity of the widened portion 231 formed at least within the range of the sheet width. can be done. Therefore, the cradle 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 more stably reduced or avoided. 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 widened portion 231 of the support frame member 23. Therefore, the plate-shaped heater device 3H can heat the contact portion 21 of the cradle 2, which contacts the resin molded sheet J, 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 greatly 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 widened portion 231 of the support frame member 23, the amount of heat generated by the heater device 3H is formed at least within the range of the seat width of the support frame member 23. Heat can be stored in the widened portion 231 . Therefore, the amount of heat stored in the widened portion 231 is added to the amount of heat generated by the heater device 3H, and the contact portion 21 of the cradle 2 that contacts the molded resin sheet J can be rapidly 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 can be improved, or the cycle time during cutting can be shortened, and the generation of cracks and chips during high-speed cutting of the resin-molded sheet J can be prevented. can be reduced or avoided.

Further, according to this 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 molded sheet J, the cutter 1 ( 1M), the cutter side J1 of the resin molded sheet J, which the cutting edge 11 of 1M) bites first, is crushed like a wedge, and the amount of crushing is reduced, and the cutting edge 11 of the cutter 1 (1M) cuts behind the counter cutter of the resin molded sheet J. The tensile force Q3 that horizontally expands the side J2 can be reduced. Therefore, the receiving table 2 and the holding table 4 can more strongly restrain the resin-molded sheet J along the cutting line SL, and the breakage of the resin-molded sheet J on the side opposite to the cutter J2 can be delayed further or more reliably. can be avoided.

Further, the cutter 1 is a circular blade 1M formed in a thin plate shape, and a drive mechanism that reciprocates the circular blade 1M along the cutting line SL from a retracted position K1 on the sheet width direction outer side to an advanced position K2 on the opposite side. 5, the position of the cutting edge 11 for cutting the resin-molded sheet J when the circular blade 1M moves from the retracted position K1 to the forward position K2, and the position of the circular blade 1M retracted from the forward 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 to a different position, and the durability of the cutting edge 11 can be improved. As a result, it is possible to reduce or avoid generation of cracks and chips for a longer period of time when cutting the resin molded sheet J having a plurality of heat-molded resin molded articles JS into a predetermined length.

Further, according to this embodiment, the holding table 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 gripping bracket 52 so as to be adjustable in height. Therefore, by adjusting the height of the gripping bracket 52 with respect to the movable portion 51, the protrusion amount α of the blade edge 11 of the cutter 1 protruding from the contact portion 41 of the holding table 4 with respect to the resin molded sheet J can be easily adjusted. can be adjusted to Therefore, depending on the thickness of the resin-molded sheet J, etc., 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. As a result, it is possible to easily reduce or avoid the generation of cracks and shavings during cutting of a plurality of types of resin molded sheets J having different thicknesses.

Further, according to the present embodiment, the holding table 4 is formed with a predetermined width along the moving locus of the gripping bracket 52 with the standing wall portion 43 rising upward from the contact portion 41 contacting the resin molded sheet J. , the vertical wall portion 43 is formed with a notch portion 433 for operation of the grip bracket 52 corresponding to the forward position K2 or the retracted position K1 of the cutter 1, so that the cutter 1 having the notch portion 433 for operation is formed. At the forward position K2 or the retracted 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 fixed portion 53 of the drive mechanism 5 . Therefore, while observing the state of cutting the resin molded sheet J, the cutter 1 can be replaced or the position of the cutting edge 11 can be quickly changed when necessary. As a result, it is possible to prevent the occurrence or increase of cracks and chips due to wear and chipping of the cutting edge 11 .

Further, according to the present embodiment, the abutting portion 21B of the cradle 2B, which contacts the resin-molded sheet J, is formed with the protrusion 211B that bites into the resin-molded sheet J along the cutting line SL. When 1 cuts the resin-molded sheet J, the protrusion 211B bites into the resin-molded sheet J, so that the cradle 2B and the holding table 4 further restrain the resin-molded sheet J along the cutting line SL. can be done. In addition, since the projection 211B bites into the resin-molded sheet J, the contact area of the cradle 2B with the resin-molded sheet J increases, and the heat amount of the heated cradle 2B is transferred to the cutting edge 11 of the cutter 1 with a delay. The force can be quickly transmitted to the counter-cutter side J2 of the resin molded sheet J that bites. As a result, while the cradle 2 and the holding table 4 restrain the resin-molded sheet J more strongly along the cutting line SL, the side J2 of the resin-molded sheet J opposite to the cutter is quickly softened, and the resin-molded sheet J is cut at a high speed. Generation of cracks and chips during cutting can be further reduced or avoided.

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

Reference Signs List 1 cutter 1M circular blade 2, 2B cradle 3 heating device 3H heater device 4 holding table 5 drive mechanism 7 lifting device 10, 10B resin molded sheet cutting device 11 cutting edge 21, 21B contact portion 22 cutting groove 23 support frame member 41 contact Contact portion 42 Connecting portion 43 Standing wall portion 51 Movable portion 52 Gripping bracket 53 Fixed portion 211B Protruding portion 231 Widening portion 231S Side wall surface 232 Both ends 433 Notch portion for operation K1 Backward position K2 Forward position K3 Clamping position K4 Open position JS resin molding Product J Resin molded sheet SL Cutting line

Claims (7)

A cutter having a wedge-shaped cutting edge and a cutting groove into which the cutting edge is inserted are formed in the width direction of the sheet in contact with a resin-molded sheet having a plurality of heat-molded resin molded products arranged opposite to the cutter. a resin-molded sheet cutting device for cutting the resin-molded sheet with the cutter in contact with the cradle to a predetermined length at the position of the cutting groove,
A heating device for heating the cradle is provided on the cradle or in the vicinity of the cradle,
A resin-molded sheet cutting apparatus, comprising: a holding table, which sandwiches the cutting line of the cutter and holds the resin-molded sheet between itself and the receiving table, at a position facing the receiving table. In the resin molded sheet cutting device according to claim 1,
The cradle includes a support frame member having a widened portion that supports the abutting portion that abuts on the resin-molded sheet and has a width that is at least within the range of the seat width,
At both ends of the support frame member, there are provided a holding position where the cradle is close to the holding base and holds the resin-molded sheet therebetween, and a holding position where the cradle is spaced apart from the holding base and allows the resin-molded sheet to pass therethrough. A resin-molded sheet cutting apparatus, characterized in that an elevating device for vertically moving the cradle is connected to an open position. In the resin molded sheet cutting device according to claim 2,
The resin molded sheet cutting apparatus, wherein the heating device is a plate-shaped heater device, and the heater device is adhesively fixed to a side wall surface of the widened portion of the support frame member. In the resin molded sheet cutting device according to any one of claims 1 to 3,
The cutter is a circular blade formed in a thin plate shape, and is provided with a drive mechanism that reciprocates the circular blade from a retracted position on the sheet width direction outer side to an advanced position on the opposite side along the cutting line. A resin molded sheet cutting device. In the resin molded sheet cutting device according to claim 4,
A resin-molded sheet cutting apparatus, wherein the holding table is connected to a fixed portion of the drive mechanism, and the cutter is connected to a movable portion of the drive mechanism via a gripping bracket so as to be adjustable in height. . In the resin molded sheet cutting device according to claim 5,
The holding base is formed with an upright wall portion that rises upward from a contact portion that abuts on the resin-molded sheet and has a predetermined width along the moving locus of the gripping bracket. A resin-molded sheet cutting apparatus, wherein a notch for operation of said gripping bracket is formed corresponding to a position or a retracted position. In the resin molded sheet cutting device according to any one of claims 1 to 6,
A resin-molded sheet cutting apparatus, wherein a projection portion that bites into the resin-molded sheet is formed along a cutting line on a contact portion of the receiving table that contacts the resin-molded sheet.

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