CN115476405A - Sheet material trimming device, sheet material trimming method, and sheet material molded product - Google Patents

Abstract

The subject provides a sheet trimming device which can easily control the position of an uncut part when a resin molding sheet is formed and trimmed. In a sheet trimming device (100) for cutting a semi-formed sheet (92) as a formed resin formed sheet by using a cutting knife (122), a part of the cutting knife (122) is provided with a marking part (122 a), the marking part (122 a) forms a non-cutting part (95) corresponding to a non-cutting part, the marking part (122 a) has a top part (122 b) formed by combining two opposite arc parts (122 c), and the cutting edge height of the cutting knife (12) is reduced at the top part (122 b).

Description

Sheet material trimming device, sheet material trimming method, and sheet material molded product

technical field

The present invention relates to a technique for trimming a resin molded sheet shaped by a forming machine, and more particularly to a technique for controlling uncut portions during trimming with a Thomson knife.

Background technique

Sheet molded products are widely used, for example, as packaging containers and food trays for foodstuffs. Such a sheet molded product is manufactured using a thermoforming machine and a sheet trimming device, and a method of blanking a resin molded sheet using a thermoforming machine and trimming it using a Thomson knife is known.

When trimming the shaped resin molded sheet, the sheet trimming device cuts off the periphery of the sheet molded product with a Thomson knife, and the sheet molded product and the connection frame part are connected by the uncut part, and the subsequent blanking In the process, only the sheet molded product is cut. At this time, since the connecting frame portion is in the shape of a long sheet, it is rolled up by the scrap collection unit and collected. At this time, the method of attaching the cutout portion becomes a problem.

Patent Document 1 discloses a technology related to a vacuum forming method and apparatus. The vacuum forming apparatus described in Patent Document 1 includes a heating step, a vacuum forming step, a trimming step, and a knock-off step. The sheet heated in the heating step is formed in the vacuum forming step, and cut using a Thomson knife in the trimming step. In the knock-out process, the sheet molded product is taken out. Among them, in the trimming process, a ring-shaped Thomson knife formed to correspond to the outline shape of each sheet molded product is fixed to the substrate and used as a blanking knife. By using this blanking cutter, the sheet is cut into a sheet molded product in a partially uncut state.

Patent Document 2 discloses technology related to a blanking unit and a plastic sheet forming device. With a plastic sheet forming device having a Thomson knife and a blanking part, the shape of the uncut part connecting the sheet formed product and the connecting frame part (referred to as a frame in Patent Document 2) can be high-quality and minimized, The Thomson knife is a cutting knife for vacuum-forming or pressure-shaping thermoplastic sheets, and the blanking part is equipped with an opposite plate for receiving the Thomson knife. By setting a predetermined groove on the opposite plate, the plastic sheet can be Part of the blank in an uncut state.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2001-88208.

Patent Document 2: Japanese Unexamined Patent Publication No. 2006-240053.

Contents of the invention

The problem to be solved by the invention

However, in the techniques described in Patent Document 1 and Patent Document 2, there is a problem that it is difficult to control uncut portions. The uncut portion is cut in a subsequent process at the portion where the sheet molded product and the connection frame portion are connected. However, in the past, processing such as breaking the uncut portion in the knock-off process to separate the sheet molded product from the connection frame portion made it impossible to control whether the sheet molded product side has the uncut portion or the connection frame portion side. Problems with the cutting department.

When an uncut portion is provided on the side of the sheet molded product, the uncut portion becomes a protrusion and remains in the sheet molded product. In this way, it is considered that when the film is provided on the sheet molded product, the film is damaged, and the end user feels pain when touching the end surface of the sheet molded product by touching the uncut portion that becomes the protrusion. Therefore, there is a need for a trimming method such that the connection frame portion has an uncut portion side.

Therefore, an object of the present invention is to solve such problems, and to provide a sheet trimming device, a sheet trimming method, and a sheet molded product that can easily control the position of an uncut portion when trimming a resin molded sheet.

solutions to problems

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

(1) A sheet trimming device that cuts a formed resin sheet with a Thomson knife held on a base, and cuts it into a sheet molded product and a connecting frame portion, characterized in that , the Thomson knife is that its tip is formed into a continuous circular or rectangular shape surrounding the formed sheet product, is held on a base, and at least two parts of the tip are provided for forming an uncut portion The non-cutting portion of the non-cutting portion, the tip of the non-cutting portion is a combination of two facing circular arcs to have a top shape, and the top is formed to protrude toward the sheet molded product side or toward the connecting frame The side is raised.

According to the aspect described in (1) above, the Thomson knife is provided with a non-cutting part, which forms the non-cutting part of the resin molded sheet, and the non-cutting part is formed in the shape of a top by combining two arcs facing each other. Therefore, the uncut portion formed in the resin molded sheet has a tapered shape either on the sheet molded product side or the connection frame portion. This is because the shape of the tip of the Thomson knife is a combination of two arcs facing each other at the non-cutting portion to form a top shape, so the shape of the tip of the non-cutting portion becomes thinner toward the top.

Therefore, the uncut portion becomes thinner in the direction of forming the top of the non-cut portion formed at the blade edge, so the uncut portion becomes easy to be cut at the thinned portion, and when knocked off in the next process, It is possible to cut off the aimed position. That is, by selecting the shape of the tip of the Thomson knife to provide a non-cutting portion protruding toward the sheet molded product side, or to provide a non-cutting portion protruding toward the connection frame portion side, it can be controlled so that the non-cutting portion is not formed. The cut portion is cut so that it is on either the sheet molded product side or the connection frame side. Therefore, for example, if the uncut portion is controlled to be cut on the sheet molded product side, no convex portion will be formed on the sheet molded product. As a result, for example, the situation where the end user feels pain when touching the edge of the sheet molded product can be eliminated.

(2) Preferably, in the sheet trimming device described in (1), the non-cutting portion includes a portion where the blade edge is interrupted and separated from the top.

According to the aspect described in (2) above, the same effect as that of the sheet trimming device described in (1) is obtained. If the point where the two arcs intersect is not formed at the top, but the tip of the knife is formed so that the two arcs gradually approach, then the one side of the uncut portion as described in (1) is obtained. finer effect. Therefore, it is possible to control the formation of uncut portions on the side of the sheet molded product or the formation of uncut portions on the side of the connecting frame portion.

(3) Preferably, in the sheet trimming device described in (1) or (2), the non-cutting portion formed on the Thomson knife is a puncture formed by a tool.

According to the aspect of (3) above, since the processing of the Thomson blade of the sheet trimming device described in (2) is performed with a tool, the non-cutting portion can be easily formed. For example, a sharp-tipped tool such as a chisel is used to strike the portion where the convex portion is formed to form a dent. At this time, by changing the direction in which the tool comes into contact with the Thomson knife, 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 connection frame portion side. Since the uncut portion can be formed by an easy method, the working efficiency is good and it is preferable.

(4) Preferably, in the sheet trimming device described in any one of (1) to (3), the non-cutting portion is formed to protrude toward the molded product side of the resin molded sheet, and the knife The height of the tip from the base is formed lower than that of other parts.

According to the aspect (4) above, the non-cutting portion is formed on the Thomson knife so as to protrude toward the sheet molded product side of the resin molded sheet. The frame side has an uncut portion. By doing so, as a result, depressions are formed in the sheet molded product. A slight depression is formed in the sheet molded product, and two opposing circular arcs are formed on the Thomson knife, so that no corner is formed in the depression, and the end user does not get scratched even if he touches it with his finger, which contributes to safety Provides excellent sheet molded products.

In addition, 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 method of trimming a sheet, wherein a formed resin-formed sheet is cut with a Thomson knife held on a base, and cut into a sheet molded product and a connecting frame portion, wherein the Thomson knife In order that the blade edge is formed in a ring shape so as to surround the sheet molded product, is held on the base plate, and non-cutting portions for forming uncut portions are provided at least two places of the blade edge, and the The blade tip of the non-cutting portion has a shape of a top formed by combining two opposing circular arcs. The Thomson knife advances relative to the molded resin molded sheet, thereby cutting the resin molded sheet and forming the uncut portion connected to the connecting frame portion. connecting part.

(6) Preferably, in the sheet trimming method described in (1), the non-cutting portion includes a portion where the tip of the blade is interrupted at the top.

According to the aspect of said (5) or (6), the sheet trimming method which can obtain the same effect as the invention as described in (1) can be provided. That is, it is possible to provide a sheet trimming method in which the shape of the tip of the Thomson knife can be selected so that the non-cutting portion protrudes toward the sheet molded product side or the non-cutting portion protrudes toward the connection frame portion. Therefore, for example, if the uncut portion is controlled to be cut on the sheet molded product side, no convex portion will be formed on the sheet molded product. As a result, for example, the situation where the end user feels pain when touching the edge of the sheet molded product can be eliminated.

(7) Preferably, in the sheet trimming method described in (5) or (6), the non-cutting portion is formed to protrude toward the molded product side of the resin molded sheet, and the distance between the knife edge and the The height of the base is formed lower than other parts.

According to the aspect of said (7), the sheet trimming method which can obtain the same effect as the invention described in (4) can be provided. That is, it is possible to provide a sheet trimming method in which a slight depression is formed in a sheet molded product, and two opposing circular arcs are formed with a Thomson knife, whereby corners are not formed in the depression. , Even if the end user touches it with their fingers, it will not be scratched, and it can provide a sheet molded product with excellent safety.

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

(8) Preferably, the formed sheet product manufactured by the sheet trimming method described in (7) has an outer edge portion cut by the Thomson knife, and is connected to the outer edge portion to be erected. In the formed side portion, a plurality of notches are formed in a part of the outer periphery of the outer edge portion, and the notches are formed by transferring the shape of the non-cut portion.

According to the aspect of (8) above, it is possible to provide a sheet molded product in which no convex portion due to an uncut portion can be formed on the outer periphery of the outer edge portion of the sheet molded product, so that, for example, the terminal Users will not feel pain when touching the edges.

Description of drawings

FIG. 1 is an overall side view of a sheet trimming device according to the present embodiment.

Fig. 2 is a plan view showing a portion of the sheet trimming device of the present embodiment on the lower side of the delivery line.

Fig. 3 is a plan view of the cutting blade of the present embodiment.

FIG. 4 is a perspective view showing a state in which a dent portion is formed on a cutting blade according to the present embodiment.

FIG. 5A is a perspective view showing a state in which a puncture is formed by cutting according to the present embodiment.

Fig. 5B is a plan view showing a formed sheet product processed by the sheet trimming device according to the present embodiment.

Fig. 5C is an enlarged view of a short side portion of the sheet molded article of the present embodiment.

FIG. 6 is a schematic view showing a state in which a part of the periphery of the useful part of the molded product is partially cut while leaving a non-cut portion in the semi-formed product according to the present embodiment.

Fig. 7 is an enlarged view of a useful portion of a molded article according to this embodiment.

FIG. 8 is an enlarged view of a non-cut portion of the present embodiment.

detailed description

First, an outline of a thermoforming process using the sheet trimming device 100 of the present invention will be described. In the manufacture of a sheet molded product, a long resin molded sheet is used, which is thermoformed in a thermoforming step to obtain a semi-formed product. Next, in the trimming step, the semi-formed product is trimmed to obtain a sheet molded product. The sheet trimming apparatus 100 of the present invention is an apparatus used in a trimming process.

In the thermoforming process, a long resin molded sheet that is intermittently supplied from a sheet winding roll is heated to intermittently produce a semi-formed product in which a part of the sheet surface is molded by a mold. . In the trimming process that is the subsequent process, the useless portion around the useful portion of the molded product is trimmed by the sheet trimming device on the semi-formed product sent out from the sheet thermoforming device. Then, in the product delivery process, the useful part of the molded product is taken out to obtain a sheet molded product (product).

Next, embodiments of the present invention will be described using the drawings. First, an outline of the shape of the sheet molded product 90 formed in the above flow will be described. 5A to 5C are side views showing molded products processed by the sheet trimming device 100 . FIG. 5A is a side view showing a formed sheet product 90 processed by the sheet trimming device 100 . FIG. 5B is a plan view showing the formed sheet product 90 processed by the sheet trimming device 100 . FIG. 5C is an enlarged view of the short-side outer peripheral edge portion 90 cs of the sheet molded product 90 . The sheet molded product 90 is a sheet molded product used for containers suitable for food and the like.

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

And, as shown in FIG. 5C, the notch part 90d is formed to be notched in a manner that two arcs protrude from the edge of the outer peripheral edge 90c connecting the vertices toward the inside of the sheet molded product 90, and the thickness is about 0.1 to 0.2 mm. depth. The cutout portion 90d has a size that does not particularly hinder the use of the sheet molded product 90 . In addition, this depth can also be changed as needed.

Next, the semi-formed sheet 92 will be briefly described. FIG. 6 shows an outline of a primary cutting site 94, which will be described later, around the useful portion 93 of the molded product by leaving a non-cutting site 95 corresponding to an uncut portion with respect to the semi-formed sheet 92 by the trimming unit 104 of the sheet trimming device 100. Condition. The semi-molded sheet 92 refers to a sheet in a state in which a long sheet 91 is thermoformed and includes a plurality of molded product useful portions 93 in which a part of the sheet 91 is formed. Therefore, the sheet in the state of being supplied to the sheet trimming apparatus 100 in the transition from the previous process to the trimming process is referred to as a semi-formed sheet 92 .

In addition, the semi-formed sheet 92 is cut at the primary cutting portion 94 in the trimming process, whereby a plurality of arranged molded product useful portions 93 and the connecting frame portion 96 arranged around them are connected via the non-cutting portion 95. . The connecting frame portion 96 is in the shape of a ladder, and holds the formed sheet product 90 as a product through the non-cutting portion 95 . In the product delivery process, the formed sheet product 90 is cut from the connecting frame portion 96 and rolled up.

Next, an outline of the sheet trimming device 100 will be described. FIG. 1 is an overall side view of a sheet trimming device 100 according to the present embodiment. FIG. 2 is a plan view showing a portion of the sheet trimmer 100 below the delivery line FL. In addition, in FIG. 1 , the left side in the horizontal direction of the drawing is referred to as the upstream side in the delivery direction HZ, and the right side is referred to as the downstream side in the delivery direction HZ. In addition, let the up-down direction in drawing be the up-down direction VT. In addition, each direction is defined with the direction perpendicular|vertical to the paper surface of FIG. 1 being a width direction WD. Each drawing after FIG. 2 is also described based on this definition.

The sheet trimming device 100 is installed in the subsequent process of the sheet thermoforming device not shown in the figure, and consists of a control unit 102, a fine-tuning unit 104, a molded product delivery unit 105, a molded product unloading unit 106, a scrap recycling unit 107, The conveyance part 110 etc. are comprised.

The conveyance section 110 has a guide member for positioning the semi-formed sheet 92 sent out on the delivery line FL, and has a molded product delivery section 105 that moves the semi-formed sheet 92 carried in from the previous process via the trimming section 104 to the output side. The sending direction HZ sending function. Then, the elongated connection frame portion 96 cut from the useful portion 93 of the molded product is sent out to the scrap recovery portion 107 . The connection frame portion 96 is rolled up by the scrap collection unit 107 and collected.

The control unit 102 includes a storage unit for storing parameter setting values necessary for operation control of various servo motors, setting values for operation and stop of various units, and programs necessary for operation control. Furthermore, the control unit 102 performs various operation controls of the trimming unit 104 , the molded product delivery unit 105 , the scrap collection unit 107 , and the conveyance 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 a servo motor (built-in encoder).

The fine adjustment unit 104 includes a primary fine adjustment unit 120 composed of an upper table 121 and a lower table 123 provided with a cutting blade 122 . The cutting blade 122 is deformed into a substantially rectangular shape and is held by the base plate 121 a , and the base plate 121 a is fixed to the upper table 121 . The upper stage 121 and the lower stage 123 are disposed so as to face each other across the delivery line FL.

The upper stage 121 and the lower stage 123 convert rotational motion into linear motion based on the rotation of one servo motor via a crank mechanism using a cam and a link, thereby approaching or moving away from each other in a synchronized periodic motion. In the state where the upper table 121 and the lower table 123 are closest to each other, the end of the cutting knife 122 is pushed into the semi-formed sheet 92 to cut the primary cutting portion 94 . Details will be explained later.

The elevating unit 130 is provided in the molded product delivery unit 105 , and the useful part 93 of the molded product is cut from the connection frame 96 by the elevating unit 130 , and the sheet molded product 90 is sent to the molded product delivery unit 106 .

FIG. 3 shows a plan view of the cutting blade 122 . FIG. 4 is a perspective view showing the state where the punctured portion 122 a is formed on the cutting blade 122 . A Thomson knife is used as the cutting knife 122, and it is held on the base plate 121a so that the tip of the knife protrudes. As shown in FIG. 6 , it has the function of cutting the semi-formed sheet 92 at the trimming part 104 to form a state where the useful part 93 and the connecting frame part 96 are connected via the non-cutting part 95 . The punctured portions 122 a provided at two places on the short side of the cutting blade 122 contribute to the formation of the non-cutting portion 95 .

The punctured part 122a is formed by a tool not shown in the drawing with a flat end and a sharp shape. The cutting blade 122 is erected and fixed so as to form a right angle with respect to the surface of the base plate 121a. This cutting blade 122 is deformed using a tool. At this time, the cutting edge of the cutting blade 122 is deformed by the tool and is pushed toward the base plate 121a side, and as shown in FIG. That is, the height of the cutting edge of the punctured part 122a becomes lower in the direction closer to the base plate 121a side than the height of the cutting edge of other parts.

In this way, the cutting blade 122 becomes lower at the edge of the scoring portion 122, and the cutting blade 122 is plastically deformed to form the scoring portion 122a, so the shape of the cutting edge of the cutting blade 122 draws an arc from the top 122b of the scoring portion 122a. Connect to the straight part on the short side. That is, the two arc portions 122c are formed to face each other. And, the top 122b is formed on the extension line of the two arc portions 122c.

In addition, depending on the material of the cutting blade 122, the cutting blade 122 is often broken at the punctured portion 122a. In this case, the arc portion 122c has a shape in which the intersection points are not connected at the top 122b, but the non-cutting portion 95 can be formed in the same manner as in the case of being connected without affecting the function of the punctured portion 122a.

And, as described above, the molded product useful part 93 is pushed by the elevating unit 130 in the molded product delivery part 105, whereby the sheet molded product 90 cut from the connecting frame part 96 to the molded product useful part 93 is carried out. Section 106 is transferred. At this time, the elevating unit 130 has an adsorption part not shown in the figure, and is fixed by suction from the back side of the bottom 90a of the useful part 93 of the molded product. The molded sheet product 90 is opened, and the molded sheet product 90 is moved onto the conveyor belt provided in the product conveyance unit 106 . Furthermore, the connection frame portion 96 is recovered in the scrap recovery unit 107 .

The sheet trimming device 100 according to the present embodiment has the above-mentioned configuration, and thus has the following functions and effects.

First, when the sheet material 91 is formed and trimmed, the position control of the non-cutting portion 95 can be easily performed. This is because of the following feature: in the sheet trimming device 100 that cuts the semi-formed sheet 92 that is a formed resin molded sheet using the cutting blade 122, a part of the cutting blade 122 is provided with a scoring portion 122a. The portion 122a forms a non-cutting portion 95 corresponding to the uncut portion, and the scored portion 122a has a top 122b in which two opposing circular arc portions 122c are combined.

FIG. 7 shows an enlarged view of a molded product useful portion 93 of the semi-formed sheet 92 . FIG. 7 is an enlarged view of part B in FIG. 6 . FIG. 8 shows an enlarged view of the non-cut portion 95 . In addition, the non-cut portion 95 in FIG. 7 and FIG. 8 is shown enlarged for explanation. By using such a cutting blade 122 , a primary cutting portion 94 as shown in FIG. 7 is formed in the semi-formed sheet 92 as shown in FIG. 6 in the trimming unit 104 . The primary cutting portion 94 shown dotted in FIG. 7 is a portion where the cutting blade 122 comes into contact with the semiformed sheet 92 and is cut by the cutting blade 122 .

As shown in FIG. 4 , the top portion 122 b formed on the cutting blade 122 has a blade edge height that is lower at a height h than that of the straight portion of the cutting blade 122 . Therefore, when the cutting blade 122 is inserted into the semi-formed sheet 92 sent on the delivery line FL, it cannot cut the punctured portion 122a and forms a non-cutting portion 95 as shown in FIGS. 7 and 8 . And, the cutting blade 122 is formed in a shape as shown in FIG. 3 , that is, inwardly protruding and protruding toward the useful part 93 side of the molded product, so that the non-cutting portion 95 is formed on the sheet. The fret 90 side is cut open.

More specifically, in FIG. 8 , the cutting line 96 is shown on the distal end side of the non-cutting portion 95 . Although it is a line that does not actually exist, this cutting line 96 portion is the narrowest portion of the non-cutting portion 95 . Therefore, this portion is the weakest portion and is severed near the cutting line 96 . Further, a notch 90 d is formed in the short-side outer peripheral edge portion 90 cs of the outer peripheral edge 90 c of the sheet molded product 90 . Since the punched portion 122a is formed in a convex direction, for example, if the punched portion 122a is formed in a direction away from the useful portion 93 of the molded product, a non-cut portion is formed on the connection frame portion 96 side, On the sheet molded product 90 side, a convex portion is formed at a portion corresponding to the notch portion 90d.

Therefore, the position of the cutting line 96 at the non-cutting portion 95 can be controlled by forming the puncture portion 122 a on the cutting blade 122 . Thereby, it is possible to control whether the uncut portion is provided on the sheet molded product 90 side or whether the uncut portion is provided on the connection frame portion 96 (abutting against the non-cut portion 95 ).

In addition, when the cutting blade 122 forms the scoring portion 122a, the scoring portion 122a is formed including the arc portion 122c, so as shown in FIG. non-cutting part. Therefore, when the sheet molded product 90 is polished, it does not become a cause of breakage, and when the end user directly touches it, it does not get scratched, and the sheet molded product 90 excellent in safety can be provided.

In addition, forming the punctured portion 122a on the cutting blade 122 can be easily performed by using a tool, and thus the work efficiency is high, which is preferable. Also, when the punctured portion 122a formed by the cutting blade 122 breaks without being completely plastically deformed at the top 122c as described above, the same effect as the case where the top 122a is connected is obtained.

As mentioned above, although the sheet trimming apparatus 100 of this invention was demonstrated, this invention is not limited to this, Various changes are possible in the range which does not deviate from the summary. For example, in this embodiment, an example is shown in which the notch 90d is formed in the short-side outer peripheral portion 90cs of the outer peripheral edge 90c of the sheet molded product 90, but it is also possible to form a protrusion in the short-side outer peripheral portion 90cs. The scoring portion 122a of the cutting blade 122 is formed in a partial manner. In this case, since the notch part 90d is not formed in the sheet molded product 90, the fall of product strength can be prevented. It is thought that it is more effective to form the convex portion on the short-side outer peripheral edge portion 90 cs depending on the material of the resin.

In addition, when notch part 90d is provided in the outer peripheral edge 90c of the sheet|seat molded product 90, the number can also be increased or decreased as needed. In addition, although the shape of the sheet molded product 90 is illustrated in FIG. 5A , the outer shape of the sheet molded product 90 may be changed instead of a bathtub shape to a heart shape, or the outer peripheral edge 90c may be a slightly complicated outer peripheral shape.

In addition, the resin molded sheet supplied to the sheet trimming apparatus 100 may be a plate-like sheet processed into a predetermined length instead of a continuous sheet. That is, instead of continuous forming, the sheet trimming device 100 shown in this embodiment may be used in a subsequent step of a batch processor. This is not the case, and there are cases where the molded product delivery unit 105, the molded product delivery unit 106, the scrap collection unit 107, and the like are not provided. In addition, in the case of description, the method in which the molded product delivery part 105 uses the elevating unit 130 to mechanically drop the material is shown, but in the case of using the semi-formed sheet 92 formed by continuous molding, the molded product delivery unit may not be provided. The sheet molded product 90 is manually cut open at the portion 105 . In this way, the configuration and the like of the sheet trimming device 100 may be changed within a range that does not violate the gist of the present invention.

In addition, besides the tool for forming the scribed portion 122a by hand, the scribed portion 122a may be formed by pressing the cutting blade 122 with a pressure cylinder equipped with a jig with a flat end and a sharp end, so that the scribed portion 122 may be formed on the cutting blade 122. The non-cutting portion of portion 122a.

Explanation of reference signs

90 sheets molded product

92 semi-formed sheet

100 sheet trimming device

104 Fine Tuning Department

122 cutting knife

122a marking part

122b top

122c arc portion.

Claims (8)

1. A sheet trimming device that cuts a formed resin sheet with a Thomson knife held on a base, and cuts it into a sheet molded product and a connecting frame portion, characterized in that, The Thomson knife is, The blade edge is formed in a ring shape to surround the sheet molded product, is held on the base plate, and non-cutting portions for forming uncut portions are provided at least two positions of the blade edge, The blade tip of the non-cutting portion has a top shape formed by combining two opposing circular arcs, and the top portion is formed to protrude toward the sheet molded product side or toward the connection frame portion side. 2. The sheet trimming device according to claim 1, wherein: The non-cutting portion includes a portion where the tip is interrupted at the top. 3. The sheet trimming device according to claim 1 or claim 2, wherein: The non-cutting portion formed on the Thomson knife is a burr formed by a tool. 4. The sheet trimming device according to any one of claims 1 to 3, wherein: The non-cutting portion is formed to protrude toward the sheet molded product side of the resin molded sheet, and the height of the knife edge from the base is formed to be lower than other portions. 5. A sheet trimming method, which cuts the formed resin-formed sheet with a Thomson knife held on a base, and cuts it into a sheet-formed product and a connecting frame portion, characterized in that, The Thomson knife is, The blade tip is formed in a ring shape so as to surround the molded product, is held on the base plate, and non-cutting portions for forming uncut portions are provided at least two positions of the blade tip, The blade tip of the non-cutting portion has a top shape formed by combining two opposing circular arcs, and the top portion is formed to protrude toward the molded product side or toward the connection frame portion side. The Thomson knife is advanced relative to the molded resin molded sheet, thereby cutting the resin molded sheet and forming the uncut portion which is connected to the frame portion. The connecting part of the connection. 6. sheet trimming method as claimed in claim 5, is characterized in that, The non-cutting portion includes a portion where the tip is interrupted at the top. 7. The sheet material trimming method as claimed in claim 5 or claim 6, characterized in that, The non-cutting portion is formed to protrude toward the molded product side of the resin molded sheet, and the height of the knife edge from the base is formed to be lower than other portions. 8. A sheet formed product manufactured by the sheet trimming method according to claim 7, characterized in that, It has an outer edge portion cut by the Thomson knife, and a side portion connected to the outer edge portion and formed upright, a plurality of notches are formed in a part of the outer periphery of the outer edge portion, The notch is formed by transferring the shape of the non-cut portion.

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