JP2022191560A - Sheet trimming device, sheet trimming method, and sheet molded item - Google Patents

Abstract

A sheet trimming device capable of easily controlling the position of an uncut portion when molding and trimming a resin molded sheet. A sheet trimming device (100) for cutting a semi-molded sheet (92), which is a resin-molded sheet after molding, by using a cutting blade (122). The dented portion 122a has a top portion 122b in which two arcuate portions 122c facing each other are combined. [Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to a technique for trimming a resin-molded sheet that has been shaped by a molding machine, and more particularly to a technique for controlling uncut portions in trimming using a Thomson blade.

Sheet molded products are widely used, for example, as food packaging containers and food trays. Such sheet molded products are manufactured using a thermoforming machine and a sheet trimming device, and a method of molding a resin molded sheet using a thermoforming machine and punching out using a Thomson blade for trimming is known. ing.

When trimming the shaped resin molded sheet, the sheet trimming device uses a Thomson blade to cut the periphery of the sheet molded product so that the sheet molded product and the connecting frame are connected by the uncut portion. Only the sheet molded product is cut off in the punching process. At this time, since the connecting frame remains in the form of a long sheet, it is wound up and collected by the scrap collecting section. At this time, how to attach the cut off part becomes a problem.

Patent Literature 1 discloses a technology related to a vacuum forming method and apparatus. The vacuum forming apparatus described in Patent Document 1 includes a heating process, a vacuum forming process, a trimming process, and a knockout process. The sheet heated in the heating process is formed in the vacuum forming process, and a Thomson blade is used in the trimming process. Then, the sheet molded product is taken out in the knockout process. Among these steps, in the trimming process, a punching cutter is used in which a ring-shaped Thomson blade corresponding to the contour shape of each sheet molded product is fixed to the substrate. By using this punching cutter, the sheet molded product is cut while a part of the sheet is left uncut.

Japanese Patent Laid-Open No. 2002-200000 discloses a technique related to a punching section and a plastic sheet forming apparatus. A punching unit comprising a Thomson blade, which is a cutting blade for a vacuum-formed or air-formed thermoplastic sheet, and a counter plate for receiving the Thomson blade. The shape of the uncut part that connects the sheet molded product and the connecting frame part (called a skeleton in Patent Document 2) is made with high quality by a plastic sheet molding device having a punching part that can be punched in a state where the uncut part is left uncut. can be minimized.

JP-A-2001-88208 JP 2006-240053 A

However, the technique described in Patent Document 1 and Patent Document 2 has a problem that it is difficult to control the uncut portion. The uncut portion is a portion that connects the sheet molded product and the connecting frame portion, and will be cut off in the subsequent steps. However, conventionally, the sheet molded product and the connecting frame are separated by tearing off the uncut part by the knockout process. There was a problem that I could not control whether to follow the side.

When the uncut portion is attached to the sheet molded product, the uncut portion remains as a projection on the sheet molded product. Then, when the film is applied to the sheet molded product, the film may be damaged, and when the end user touches the end surface of the sheet molded product, it is conceivable that the uncut portion that becomes a protrusion may cause pain. . Therefore, there is a need for a trimming method in which the uncut portion is attached to the connecting frame portion side.

Accordingly, the present invention solves such problems, and provides a sheet trimming device, a sheet trimming method, and a sheet molded product that can easily control the position of an uncut portion when molding and trimming a resin molded sheet. for the purpose of providing

In order to achieve the above object, a sheet trimming device according to one aspect of the present invention has the following features.

(1) A sheet trimming device that cuts a molded resin sheet after molding using a Thomson blade held on a base into a sheet molded product and a connecting frame,
The Thomson blade is
The blade edge is formed into a series of circles or rectangles surrounding the sheet molded product and is held on the base, and at least two of the blade edges are provided with recesses for forming uncut portions,
The cutting edge of the concave portion has a shape in which two arcs facing each other are combined to have a top portion, and the top portion is formed to be convex toward the sheet molded product side or convex toward the connecting frame portion side;
characterized by

According to the aspect described in (1) above, the Thomson blade has a concave portion formed in a shape having a top formed by combining two arcs facing each other to form an uncut portion of the resin molded sheet. Therefore, the uncut portion formed in the resin molded sheet has a shape in which either the sheet molded product side or the connecting frame portion is tapered. This is because the shape of the cutting edge of the Thomson blade is such that two arcs facing each other in the concave portion are combined to form a shape with a top portion, so that the shape of the cutting edge of the concave portion tapers toward the top portion.

Therefore, since the uncut portion becomes thinner in the direction in which the top of the concave portion formed on the cutting edge is formed, it becomes easier to cut at the thinned portion of the uncut portion, and when knocked out in the next process, the cut is made at the target position. can be cut. In other words, by selecting whether the cutting edge shape of the Thomson blade is provided with a concave portion so as to protrude toward the sheet molded product side, or to provide a concave portion so as to protrude toward the connecting frame portion side, the uncut portion is on the sheet molded product side. It is possible to control so as to cut at either the connecting frame side or the connecting frame side. For this reason, for example, if the uncut portion is cut off on the sheet molded product side, the sheet molded product will not be formed with a convex portion. As a result, for example, the end user does not feel pain when touching the edge of the sheet molding.

(2) In the thermoforming machine according to (1),
The recess includes a portion in which the cutting edge is interrupted and spaced apart at the top;
is preferred.

According to the aspect described in (2) above, the same effect as that of the sheet trimming device described in (1) can be obtained. Even if the point where the two arcs intersect is not formed at the top and is spaced apart, if the cutting edge is formed so that the two arcs gradually approach each other, the uncut portion as described in (1) The effect of forming one side of the is thin is obtained. Therefore, it is possible to control whether the uncut portion is formed on the sheet molded product side or the uncut portion is formed on the connecting frame portion side.

(3) In the sheet trimming device according to (1) or (2),
The recess formed in the Thomson blade is a dent formed using a tool;
is preferred.

According to the aspect (3) above, since the Thomson blade of the sheet trimming device described in (2) is processed by a tool, it is possible to easily form the concave portion. For example, a tool with a sharp tip such as a flat chisel is used to strike the place where the projection is to be formed to form a dent. At this time, by changing the direction in which the tool hits the Thomson blade, it is possible to control whether the uncut portion is left on the sheet molded product side or the connecting frame portion side. Since the uncut portion can be formed by an easy method, the working efficiency is high, which is preferable.

(4) In the sheet trimming device according to any one of (1) to (3),
The concave portion is formed so as to protrude toward the sheet molded product side of the resin molded sheet, and the height of the cutting edge from the base is lower at the top portion than at other portions. ,
is preferred.

According to the aspect of (4) above, a recess is formed in the Thomson blade so as to be convex toward the sheet molded product side of the resin molded sheet, and the top portion of the recess is lowered toward the base side, leaving the connecting frame side uncut. It is possible to control to turn on the part. This results in the formation of depressions in the sheet molding. A slight dent is formed in the sheet molding, and two opposing arcs are formed on the Thomson blade, so that the dent is not formed with a corner, and the end user does not get caught even if he or she touches it with a finger. It contributes to the provision of sheet molded products with excellent safety.

Moreover, in order to achieve the above object, a sheet trimming method according to another aspect of the present invention has the following features.

(5) A sheet trimming method in which a molded resin sheet is cut using a Thomson blade held on a base to cut into a sheet molded product and a connecting frame,
The Thomson blade is
The cutting edge is annularly formed so as to surround the sheet molded product and is held on the base plate, and at least two of the cutting edges are provided with recesses for forming uncut portions,
The cutting edge of the concave portion has a shape in which two arcs facing each other are combined to have a top portion, and the top portion is convex toward the sheet molded product side or convex toward the connecting frame portion side,
By advancing the Thomson blade with respect to the resin-molded sheet after molding, cutting the resin-molded sheet and forming the uncut portion that is a connection portion with the connecting frame portion;
characterized by

(6) In the thermoforming machine according to (1),
The recess includes a portion in which the cutting edge is interrupted and spaced apart at the top;
is preferred.

According to the above aspect (5) or (6), it is possible to provide a sheet trimming method that provides the same effects as the invention described in (1). In other words, the present invention provides a sheet trimming method that enables the user to select whether the edge shape of the Thomson blade is provided with a concave portion so as to project toward the sheet molded product side or to provide a concave portion so as to project toward the connecting frame portion side. For example, if the uncut portion is cut off on the side of the sheet molded product, the sheet molded product will not be formed with a convex portion. As a result, for example, the end user does not feel pain when touching the edge of the sheet molding.

(7) In the sheet trimming method according to (5) or (6),
The concave portion is formed so as to protrude toward the sheet molded product side of the resin molded sheet, and the height of the cutting edge from the base is lower at the top portion than at other portions. ,
is preferred.

According to the aspect (7) above, it is possible to provide a sheet trimming method that provides the same effects as the invention described in (4). That is, a slight dent is formed on the sheet molded product side, and two opposing circular arcs are formed on the Thomson blade, so that the dent is not formed with a corner, so that the end user's finger can be caught. It is possible to provide a sheet trimming method capable of providing a sheet molded article excellent in safety without causing any damage.

Moreover, in order to achieve the above object, a sheet molded product according to another aspect of the present invention has the following characteristics.

(8) In the sheet molded product manufactured using the sheet trimming method of (7),
having an outer edge cut off by the Thomson blade and a side portion formed upright connected to the outer edge;
A plurality of notches are formed in a part of the outer periphery of the outer edge,
The notch is formed by transferring the shape of the recess,
characterized by

According to the aspect of (8) above, there is no convex part due to the uncut part on the outer circumference of the outer edge part of the sheet molded product, so that, for example, the end user does not feel pain even if the edge is touched Sheet molding product can be provided.

1 is a side view of the entire sheet trimming device according to the present embodiment; FIG. FIG. 3 is a plan view showing a portion below the delivery line of the sheet trimming device according to the present embodiment; FIG. 2 is a plan view of a cutting blade of this embodiment; FIG. 4 is a perspective view showing a state in which a dent is formed on the cutting blade of the present embodiment; (a) It is a perspective view showing how cutting of this embodiment forms a dent portion. (b) is a plan view showing a sheet molded product processed by the sheet trimming device of the present embodiment; (c) It is an enlarged view of the short side portion of the sheet molded product of the present embodiment. FIG. 2 is a schematic diagram showing a semi-molded article in which a peripheral portion of a main part of the molded article is partially cut while leaving a non-cut portion of the semi-molded article. FIG. 2 is an enlarged view of the main part of the molded product of the present embodiment; It is an enlarged view of the non-cut portion of the present embodiment.

First, the outline of the thermoforming process using the sheet trimming device 100 according to the present invention will be described. In manufacturing the sheet molded product, a semi-molded product is obtained by heat-molding a long resin-molded sheet in a heat-molding process. Next, in a trimming step, the semi-molded product is trimmed to obtain a sheet molded product. A sheet trimming device 100 according to the present invention is a device used in a trimming process.

In the heat molding process, a long resin molded sheet that is intermittently supplied from a sheet winding roll is heated, and a semi-molded product is intermittently molded in a state in which a part of the sheet surface is molded by a mold. manufacture. In the trimming process, which is the next step, the sheet trimming device trims unnecessary portions around the main part of the molded product from the semi-molded product delivered from the sheet thermoforming device. Then, in the product delivery step, the main part of the molded product is taken out to obtain a sheet molded product (product).

Next, embodiments of the present invention will be described with reference to the drawings. First, an overview of the shape of the sheet molded product 90 that is molded in the flow as described above will be described. FIG. 5 is a side view showing a molded product processed by the sheet trimming device 100. FIG. FIG. 5(a) is a side view showing a sheet molded product 90 processed by the sheet trimming device 100. FIG. FIG. 5(b) is a plan view showing a sheet molded product 90 processed by the sheet trimming device 100. FIG. FIG. 5(c) is an enlarged view of the short side outer peripheral edge portion 90cs of the sheet molded product 90. FIG. The sheet molded product 90 is a sheet molded product used for food containers and the like.

As an example of the shape, a substantially rectangular bottom portion 90a as shown in FIG. is formed in A short-side outer peripheral edge portion 90cs of an outer peripheral edge 90c of the sheet molded product 90 includes four small notch portions 90d.

Then, as shown in FIG. 5(c), the notch portion 90d is formed by notching so that two circular arcs project toward the inside of the sheet molded product 90 from the edge of the outer peripheral edge 90c connecting the vertices. and has a depth of about 0.1 to 0.2 mm. The notch portion 90d has a size that does not particularly hinder the use of the sheet molded product 90. As shown in FIG. In addition, it does not prevent changing this depth as needed.

Next, the semi-molded sheet 92 will be briefly described. As shown in FIG. 6, the trim portion 104 of the sheet trimming device 100 cuts the semi-formed sheet 92 at a primary cut portion 94, which will be described later, around the main portion 93 of the molded product, leaving a non-cut portion 95 corresponding to an uncut portion. show the situation. The semi-formed sheet 92 refers to a state in which a long sheet 91 is heat-formed to include a plurality of molded product main parts 93 partially formed in the plane of the sheet 91 . Therefore, the sheet passed from the previous process to the trimming process and supplied to the sheet trimming device 100 is the semi-formed sheet 92 .

Then, the semi-molded sheet 92 is cut at the primary cutting portion 94 in the trimming process, so that the plurality of molded product main portions 93 arranged and the connecting frame portion 96 disposed therearound are separated by the non-cut portion 95. It is assumed to be in a connected state. The connecting frame portion 96 has a ladder shape, holds the sheet molded product 90 as a product by the non-cutting portion 95, and is wound after the sheet molded product 90 is separated from the connecting frame portion 96 in the product dispensing process. be taken.

Next, an outline of the sheet trimming device 100 will be described. FIG. 1 is a side view of the entire sheet trimming device 100 of this embodiment. FIG. 2 is a plan view showing a portion of the sheet trimming device 100 below the delivery line FL. In FIG. 1, the left side in the horizontal direction of the drawing is the upstream side in the feeding direction HZ in which the semi-formed sheet 92 is fed, and the right side is the downstream side in the feeding direction HZ. Also, the vertical direction in the drawing is defined as a vertical direction VT. Each direction is defined as a width direction WD, which is a direction perpendicular to the paper surface of FIG. Each drawing after FIG. 2 will also be described according to this definition.

The sheet trimming device 100 is installed in a post-process of the sheet thermoforming device (not shown), and includes a control unit 102, a trimming unit 104, a molded product delivery unit 105, a molded product unloading unit 106, a scrap collecting unit 107, and a conveying unit. It consists of part 110 grade|etc.,.

The conveying section 110 has a guide member 116 for positioning the semi-formed sheet 92 to be sent out on the delivery line FL, and the semi-formed sheet 92 brought in from the previous process is passed through the trim section 104 to the forming section on the carry-out side. It has a function of sending out in the sending direction HZ toward the product dispensing section 105 . Then, the elongated connecting frame portion 96 separated from the main portion 93 of the molded product is delivered to the scrap recovery portion 107 . The connecting frame portion 96 is wound up and collected by the scrap collecting portion 107 .

The control unit 102 is provided with a storage unit for storing parameter setting values necessary for controlling the operation of various servo motors, setting values for operation/stopping of various units, and programs necessary for operation control. It is The control unit 102 controls various operations of the trim unit 104, the molded product delivery unit 105, the scrap collection unit 107, the transport unit 110, temperature control of the heater 115, and various electrical controls. In addition, the control unit 102 has a controller and a servo driver necessary for drive control of the servo motor (with built-in encoder).

The trim section 104 is provided with a primary trim unit 120 comprising an upper table 121 provided with a cutting blade 122 and a lower table 123 . The cutting blade 122 is deformed into a substantially rectangular shape and held on the base plate 121 a , and the base plate 121 a is fixed to the upper table 121 . The upper table 121 and the lower table 123 are arranged to face each other across the delivery line FL.

The upper table 121 and the lower table 123 move toward or away from each other in a synchronized periodic motion by converting rotary motion into linear motion through a crank mechanism using cams and links based on the rotation of one servomotor. do. With the upper table 121 and the lower table 123 closest to each other, the tip of the cutting blade 122 is pushed into the semi-formed sheet 92 to cut the primary cut portion 94 . Details will be described later.

A lift unit 130 is provided in the molded product delivery section 105 , and the lift unit 130 separates the molded product main portion 93 from the connecting frame portion 96 and sends the sheet molded product 90 to the molded product unloading portion 106 .

FIG. 3 shows a plan view of the cutting blade 122. As shown in FIG. FIG. 4 is a perspective view showing a state in which the dent portion 122a is formed on the cutting blade 122. As shown in FIG. A Thomson blade is used as the cutting blade 122, and is held by the base plate 121a so that the cutting edge protrudes. As shown in FIG. 6, it has a function of cutting the semi-molded sheet 92 at the trim portion 104 so that the main portion 93 of the molded product and the connecting frame portion 96 are connected at the uncut portion 95 . Two dents 122a provided on each short side of the cutting blade 122 contribute to the formation of the non-cutting portion 95. As shown in FIG.

The dented portion 122a is formed using a tool (not shown) having a flat and pointed tip. The cutting blade 122 is fixed upright so as to be perpendicular to the surface of the base plate 121a. The cutting edge 122 is deformed using a tool. At this time, the cutting edge of the cutting blade 122 is deformed by the tool and pushed toward the base plate 121a, and deformed into a shape that is lower than other portions by a height h as shown in FIG. That is, the height of the cutting edge at the dent portion 122a is lower in the direction toward the base plate 121a than the height of the cutting edge at other portions.

Then, the height of the cutting edge of the cutting blade 122 becomes low at the dent portion 122, and the cutting blade 122 is plastically deformed to form a dent portion 122a. is connected to the straight portion on the short side by drawing an arc from the top portion 122b of the . That is, the two circular arc portions 122c are formed to face each other. A top portion 122b is formed on an extension line of the two arc portions 122c.

Although it depends on the material used for the cutting blade 122, in many cases, the cutting blade 122 is torn at the dent portion 122a. In that case, the circular arc portion 122c has a shape in which the intersection points are not connected at the apex portion 122b, but the function of the dent portion 122a is not affected, and the non-cut portion 95 can be formed in the same manner as in the case where the dent portion 122a is connected. can.

Then, as described above, by pushing the main part 93 of the molded product using the elevating unit 130 in the molded product delivery unit 105, the sheet molded product 90 in which the main part 93 of the molded product is separated from the connecting frame part 96 is molded. The product is transferred to the product unloading section 106 . At this time, the elevating unit 130 is provided with a suction portion (not shown), which is fixed by suction from the back side of the bottom portion 90a of the main part 93 of the molded product, and when the main part 93 of the molded product is moved downward, the The sheet molded product 90 is cut off at the cutting portion 95 , and the sheet molded product 90 is moved onto the belt conveyor provided in the product conveying section 106 . Then, the connecting frame portion 96 is recovered by the scrap recovery portion 107 .

Since the sheet trimming device 100 of the present embodiment has the above configuration, it has the following functions and effects.

First, when the sheet 91 is formed and trimmed, the position of the non-cut portion 95 can be easily controlled. In a sheet trimming device 100 that cuts a semi-molded sheet 92, which is a resin-molded sheet after molding, using a cutting blade 122, a part of the cutting blade 122 is provided with a non-cut portion 95 corresponding to an uncut portion. A dent portion 122a is provided, and the dent portion 122a has a top portion 122b in which two arc portions 122c facing each other are combined, and the cutting edge height of the cutting blade 12 is low at the top portion 122b. This is because it is characterized by

FIG. 7 shows an enlarged view of the main part 93 of the molded product in the semi-molded sheet 92. As shown in FIG. FIG. 7 is an enlarged view of the B portion of FIG. FIG. 8 shows an enlarged view of the uncut portion 95. As shown in FIG. Note that the non-cut portion 95 in FIGS. 7 and 8 is enlarged for explanation. By using such a cutting blade 122, a primary cut portion 94 as shown in FIG. 7 is formed in the semi-formed sheet 92 as shown in FIG. A primary cutting portion 94 shaded in FIG. 7 is a portion where the cutting blade 122 contacts the semi-formed sheet 92 and is cut by the cutting blade 122 .

As shown in FIG. 4, the top portion 122b formed on the cutting blade 122 has a cutting edge height lower than that of the cutting blade 122 in the straight portion by the height h. Therefore, when the cutting blade 122 is inserted into the semi-formed sheet 92 sent on the delivery line FL, the cutting edge 122 cannot cut at the dented portion 122a, resulting in non-uniformity as shown in FIGS. A cut site 95 is formed. Since the cutting edge 122 is shaped as shown in FIG. The non-cut portion 95 is cut off on the molded product 90 side.

More specifically, FIG. 8 shows a perforation line 96 distal to the uncut portion 95 . Although it is a line that does not actually exist, this portion of the cut line 96 is the narrowest portion of the non-cut portion 95 . Therefore, this portion is the weakest portion and is cut near the perforation line 96 . A notch portion 90d is formed in the short side outer peripheral edge portion 90cs of the outer peripheral edge 90c of the sheet molded product 90 . Since the dent portion 122a is formed in a convex direction, for example, if the dent portion 122a is formed in a direction away from the molded product main portion 93, a concave portion is formed on the connecting frame portion 96 side. On the sheet molded product 90 side, a convex portion is formed at a location corresponding to the notch portion 90d.

Therefore, by forming the dent portion 122 a on the cutting blade 122 , the position of the perforation line 96 in the non-cutting portion 95 can be controlled. Therefore, it is possible to control whether to attach the uncut portion to the sheet molded product 90 side or to attach the uncut portion (corresponding to the uncut portion 95 ) to the connecting frame portion 96 .

When forming the dent portion 122a on the cutting blade 122, the dent portion 122a is formed including the arc portion 122c. Therefore, as shown in FIG. A smooth concave portion is formed without forming a rough portion. For this reason, when the sheet molded product 90 is wrapped, it does not cause breakage, and when the end user touches it directly, it does not get caught, and the sheet is excellent in safety. A molded product 90 can be provided.

Forming the dent portion 122a on the cutting blade 122 can be easily performed using a tool, which is preferable because of good work efficiency. Even if the dent portion 122a formed on the cutting blade 122 is broken due to insufficient plastic deformation at the top portion 122c as described above, the same effect as when the top portion 122a is connected can be obtained.

Although the sheet trimming device 100 according to the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention. For example, in the present embodiment, the notch portion 90d is formed in the short-side outer peripheral edge portion 90cs of the outer peripheral edge 90c of the sheet molded product 90, but the convex portion is formed in the short-side outer peripheral edge portion 90cs. It does not prevent the formation of the dent portion 122a of the cutting blade 122 as described above. In this case, since the notch portion 90d is not formed in the sheet molded product 90, it is possible to prevent a decrease in product strength. Depending on the material of the resin, it may be more effective to form convex portions on the short-side outer peripheral edge portion 90cs.

Further, even when the notch portion 90d is provided on the outer peripheral edge 90c of the sheet molded product 90, the number thereof may be increased or decreased as necessary. Also, the shape of the sheet molded product 90 is illustrated in FIG. does not prevent you from changing

Moreover, the resin-molded sheet supplied to the sheet trimming device 100 may not be a continuous sheet, but may be a plate-shaped sheet processed to a predetermined length. That is, the sheet trimming device 100 shown in this embodiment may be used in the downstream process of the batch processing machine instead of continuous molding. In that case, the configuration may be such that the molded product delivery unit 105, the molded product unloading unit 106, the scrap collecting unit 107, and the like are not provided. Also, for convenience of explanation, the molded article delivery unit 105 has shown a method of mechanically punching out using the elevating unit 130. It does not prevent the sheet molding 90 from being cut off manually without providing the part 105 . As described above, the configuration of the sheet trimming device 100 and the like may be changed without departing from the gist of the present invention.

In addition to the tool for manually forming the dent portion 122a, the dent portion 122a can be formed by pressing the cutting blade 122 using a cylinder having a jig with a flat and sharp tip. It is not necessary to form a concave portion corresponding to the dent portion 122a in .

90 sheet molded product 92 semi-molded sheet 100 sheet trimming device 104 trim portion 122 cutting blade 122a dent portion 122b top portion 122c arc portion

Claims (8)

A sheet trimming device that cuts a molded resin sheet using a Thomson blade held on a base to cut the molded sheet into a sheet molded product and a connecting frame,
The Thomson blade is
The cutting edge is annularly formed so as to surround the sheet molded product and is held on the base plate, and at least two of the cutting edges are provided with recesses for forming uncut portions,
The cutting edge of the concave portion has a shape in which two arcs facing each other are combined to have a top portion, and the top portion is formed to be convex toward the sheet molded product side or convex toward the connecting frame portion side;
A sheet trimming device characterized by: The sheet trimming device according to claim 1,
The recess includes a portion in which the cutting edge is interrupted and spaced apart at the top;
A sheet trimming device characterized by: In the sheet trimming device according to claim 1 or 2,
The recess formed in the Thomson blade is a dent formed using a tool;
A sheet trimming device characterized by: The sheet trimming device according to any one of claims 1 to 3,
The concave portion is formed so as to protrude toward the sheet molded product side of the resin molded sheet, and the height of the cutting edge from the base is lower at the top portion than at other portions. ,
A sheet trimming device characterized by: In the sheet trimming method, the resin molded sheet after molding is cut by using a Thomson blade held on a base, and the sheet molded product and the connecting frame are cut.
The Thomson blade is
The cutting edge is formed in an annular shape so as to surround the molded product and is held on the base plate, and at least two of the cutting edges are provided with recesses for forming uncut portions,
The cutting edge of the concave portion has a shape in which two arcs facing each other are combined to have a top portion, and the top portion is formed to be convex toward the molded product side or convex toward the connecting frame portion side,
By advancing the Thomson blade with respect to the resin-molded sheet after molding, cutting the resin-molded sheet and forming the uncut portion that is a connection portion with the connecting frame portion;
A sheet trimming method characterized by: In the sheet trimming method according to claim 5,
The recess includes a portion in which the cutting edge is interrupted and spaced apart at the top;
A sheet trimming method characterized by: In the sheet trimming method according to claim 5 or claim 6,
The recess is formed so as to protrude toward the molded product side of the resin molded sheet, and the height of the cutting edge from the base is lower at the top than at other portions;
A sheet trimming method characterized by: In the sheet molded product manufactured using the sheet trimming method of claim 7,
having an outer edge cut off by the Thomson blade and a side portion formed upright connected to the outer edge;
A plurality of notches are formed in a part of the outer periphery of the outer edge,
The notch is formed by transferring the shape of the recess,
A sheet molded product characterized by

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