Sheet cutting jig, electric trimmer, cutting method, and jointing method

Abstract

The present invention provides a sheet cutting jig, an electric trimmer, a sheet cutting method using the same, and a joining method, all of which enable easy cutting of the side edges of a sheet to a constant width and thickness. [Solution] The sheet cutting jig 1 includes a cover plate 41 having an opening 411 into which a cutting bit 22 is inserted, a stage 51 having a front opening 511 and a rear opening 512 and equipped with a front wheel 61 and a rear wheel 65, a guide plate 52 positioned between the cover plate 41 and the stage 51 and equipped with a guide surface 521, a front feed roller 64 attached to the back side of the stage 51 with its top protruding from the surface of the front opening 511 and connected to the front wheel 61 via a front gear train 63 and rotating in the opposite direction to the front wheel 61, and a rear feed roller 68 attached to the back side of the stage 51 with its top protruding from the surface of the rear opening 512 and connected to the rear wheel 65 via a rear gear train 67 and rotating in the opposite direction to the rear wheel 65.

Description

Technical Field

[0001] The present invention relates to a jig for cutting a sheet such as a waterproof sheet, an electric trimmer using the same, a cutting method, and a joint method.

Background Art

[0002] When applying sheet waterproofing to a place exposed to rainwater such as a roof, rooftop, balcony, etc., as a waterproof sheet, a vinyl chloride resin sheet (hereinafter referred to as "PVC sheet") having weather resistance and flexibility and excellent watertightness at the joint part may be selected. For the same reason, a PVC sheet may also be selected as an indoor floor sheet.

[0003] Generally, the PVC sheet is carried into the construction site in a rolled-up state and cut in the width direction for use. However, when the installation width where the PVC sheet is to be laid is larger than the width dimension of the PVC sheet (material), the joints (side edges) of the PVC sheets arranged adjacent to each other may be laid in a state where they are joined together. At this time, if the side edge of one PVC sheet is joined to the side edge of the other PVC sheet in a state of being overlapped, a step will occur in the joint part, resulting in problems such as poor appearance, easy accumulation of dirt in the joint part, easy tripping at the joint part, and inability to horizontally place an article across the joint part.

[0004] The applicant of this application focused on this problem and invented the laminated sheet and its jointing method described in Patent Document 1. This laminated sheet is formed by integrating a lower sheet and an upper sheet of the same width with a width offset from each other. One end in the width direction has an upper edge portion that has the upper sheet but no lower sheet, and the other end has a lower edge portion that has the lower sheet but no upper sheet. With this laminated sheet, when the side edges (thin-walled portions) of adjacent sheets are joined together in a so-called rabbet joint, no steps are created at the joint portion, and no gaps are created between the sheets due to deterioration over time. Therefore, the waterproofing effect is not impaired, and dirt is less likely to accumulate at the joint portion, etc. (see paragraph 1

[0022] of the same document). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 7641607 [Overview of the project] [Problems that the invention aims to solve]

[0006] When attempting to join sheets together using a jointing method as disclosed in Patent Document 1, it is necessary to either manufacture PVC sheets in a form that has thin-walled sections (upper and lower edges) on the side edges of the sheets in advance at the manufacturing plant, or to form thin-walled sections for joining at the construction site by cutting off the side edges of the PVC sheets to a certain width and thickness. However, the former method has the problem of being difficult to handle during transportation, and the latter method has the problem of requiring time and skill for the cutting process, making it not easy.

[0007] The present invention has been made in view of the above problems, and aims to provide a sheet cutting jig that can easily cut the side edge of a sheet to a certain width and thickness, an electric trimmer using the same, a cutting method, and a method for joining sheets formed by the cutting method. [Means for solving the problem]

[0008] A first aspect of the present invention (first invention) is a sheet cutting jig to be attached to an electric trimmer equipped with a cutting bit, A cover plate is positioned perpendicular to the rotation axis of the cutting bit and has an opening for inserting the cutting edge of the cutting bit, A stage comprising front and rear wheels arranged parallel to and opposite the cover plate, with axles arranged parallel to each other on the back side, a front opening formed forward of the opening hole, and a rear opening formed backward of the opening hole, A guide plate is positioned between the cover plate and the stage, with a guide surface provided on the side of the opening hole for guiding the sheet, which is the workpiece to be cut, and forming a gap between the cover plate and the stage through which the sheet can pass. The top portion is attached to the back side of the stage with the surface of the front opening protruding from the front, and is connected to the front wheel via a front gear train, and the front feed roller rotates in the opposite direction to the rotation direction of the front wheel, A rear feed roller is attached to the back side of the stage with its top portion protruding from the surface of the rear opening, and is connected to the rear wheel via a rear gear train, and rotates in the opposite direction to the rotation direction of the rear wheel. The present invention provides a sheet cutting jig (hereinafter sometimes simply referred to as "jig" or "this jig") characterized by having the following features.

[0009] According to a first aspect of the present invention, the side edges of the sheet can be easily cut to a certain width and thickness.

[0010] The second invention, in the first embodiment of the present invention, is detachably attached to the electric trimmer, and the guide surface is the side surface of the guide plate and is perpendicular to the axle.

[0011] The third invention is characterized in that, in the first embodiment of the present invention, the thickness of the guide plate is set to be slightly greater than the thickness of the sheet.

[0012] The fourth invention is characterized in that, in the first embodiment of the present invention, the front gear train and the rear gear train are provided on the back side of the stage.

[0013] The fifth invention, in a first embodiment of the present invention, is characterized in that the guide plate is provided with an elongated hole extending in a direction parallel to the axle, and a spacer fixed to the cover plate and / or the stage is arranged in the elongated hole. Furthermore, with this configuration, the guide plate maintains a predetermined position by being sandwiched between the cover plate and the stage using fasteners, and by releasing the fasteners, the spacer is made slidable in the axle axis direction within a range of movement of the elongated hole.

[0014] The sixth invention is, in an embodiment of the first invention, The cover plate has a front through-hole located forward of the opening and a rear through-hole located backward of the opening. The bottom portion is attached to the front surface side of the cover plate with the bottom portion protruding from the back surface of the front through-hole, and the front pressing roller has a shaft positioned parallel to the axle, The bottom portion is attached to the front surface of the cover plate with the bottom portion protruding from the back surface of the rear through-hole, and the rear pressing roller is positioned parallel to the axle with the shaft, A front spring member biases the front pressing roller toward the stage by pressing both ends of the shaft of the front pressing roller toward the stage, A rear spring member biases the rear press roller toward the stage by pressing both ends of the shaft of the rear press roller toward the stage, It is characterized by having the following features.

[0015] The seventh invention is characterized in that, in the first embodiment of the present invention, the front gear train is configured such that the ratio of the rotational speed of the front wheel to the rotational speed of the front feed roller is 1:1, and the rear gear train is configured such that the ratio of the rotational speed of the rear wheel to the rotational speed of the rear feed roller is 1:1.1. The embodiment of the sixth invention is particularly preferred.

[0016] A second aspect of the present invention (the eighth invention) is characterized by having a sheet cutting jig of the first aspect of the present invention on its lower end, a cutting bit that is rotated by a motor, and a base plate mounted on the lower end of the electric trimmer that has an insertion hole for the cutting bit, and a protrusion amount adjustment mechanism for adjusting the amount of protrusion of the cutting bit from the insertion hole. The ninth invention is the eighth invention, Multiple block bodies are fixed to the surface of the cover plate, in which they contact each corner of the base plate when it is placed on the cover plate, thereby restricting the horizontal movement of the base plate. The opening in the cover plate is positioned to communicate with the insertion hole in the base plate when the base plate is placed within the area surrounded by the block body on the cover plate.

[0017] A third aspect of the present invention (the tenth invention) is a method for cutting a sheet using a sheet cutting jig of the first aspect of the present invention or an electric trimmer of the second aspect of the present invention, comprising a first step of fixing the arrangement of the guide plate with respect to the stage, The second step involves rotating the cutting bit at high speed, A third step involves sequentially feeding the sheet between the cover plate and the stage so that its edges contact the guide surface, thereby cutting the sheet into a strip shape with the cutting width W of the cutting bit using the cutting bit, After performing the third step, the fourth step is to stop the rotation of the cutting bit, Includes, Until the edges of the aforementioned sheet are cut to the desired width, After performing the step of moving the guide plate in a direction away from the cutting bit with a slide width equal to or less than the cutting width W of the cutting bit, a process of performing the first to fourth steps is repeatedly executed, which is characterized by a method for cutting a sheet.

[0018] A fourth aspect (Invention 11) of the present invention is to cut the edge portion on the surface side of one sheet of vinyl chloride resin with a certain width and thickness by the sheet cutting method according to the second aspect of the present invention to form a lower edge portion on the edge portion. The edge portion on the back side of the other sheet of vinyl chloride resin is cut with a certain width and thickness by the sheet cutting method according to the third aspect of the present invention to form an upper edge portion on the edge portion. A joint method for a sheet cutting jig that joints one sheet and the other sheet at their respective edge portions by welding the lower edge portion and the upper edge portion with liquid or hot air in a state where the upper edge portion of the other sheet is overlapped with the lower edge portion of the one sheet. Note that the welding may be, for example, liquid welding with a welding solution dedicated to vinyl chloride or heat welding with hot air. Alternatively, bonding by pressure bonding using a solvent may also be used. The welding may be pressure bonding without heating or pressure bonding after heating and melting.

Advantages of the Invention

[0019] According to the present invention, the side edge portion of the sheet can be easily cut with a certain width and thickness.

[0020] According to the first invention of the present invention, the above effects are achieved, and with the cutting bit rotating at high speed, the front side of the stage is set as the sheet feeding side and the rear side of the stage as the sheet discharging side, and the sheet is fed between the cover plate and the stage so that the side edge of the sheet is in contact with the guide surface, thereby the side edge of the sheet can be cut off to a constant width (cutting width of the cutting bit) and thickness. The stage is equipped with wheels, and the sheet can be continuously fed onto the stage by manually moving it in a straight line on a floor or paved surface on which the sheet is spread out. At this time, the front feed roller, which rotates in conjunction with the rotation of the front wheel, and the rear feed roller, which rotates in conjunction with the rotation of the rear wheel, can smoothly feed the sheet on the stage from the feeding side to the discharging side. According to the second invention, the sheet can be moved in a straight line while following the guide surface. According to the third invention, since the gap between the cover plate and the stage is set to be slightly larger than the thickness of the sheet, deflection of the sheet passing through this gap can be suppressed. According to the fourth invention, the stage surface through which the sheet passes can be formed flat, making it easier to perform cutting.

[0021] According to the fifth invention, the guide plate is slidable within a predetermined range in the axle axis direction (stage width direction), and the position where it is cut by the cutting bit is variable, so the side edge of the sheet can be cut wider than the cutting width of the cutting bit.

[0022] According to the sixth invention, the sheet on the stage can be pressed down by front and rear pressing rollers, and the sheet can be cut while suppressing the deflection of the sheet as it passes over the stage.

[0023] According to the seventh invention, by setting the rotational speed of the rear feed roller to be slightly higher than that of the front feed roller, a tensile force can be applied to the sheet between the feed rollers, allowing the sheet to be cut while suppressing deflection.

[0024] According to the eighth invention, the cutting depth of the sheet can be adjusted according to the thickness of the sheet being worked on. Furthermore, according to the ninth invention, the sheet cutting jig can be easily attached and detached, and by gripping the electric trimmer and moving it in a predetermined direction, the jig can be moved together with it, making it easy to feed the sheet between the cover plate and the stage.

[0025] According to the tenth invention, the side edges of the sheet can be easily cut to a constant width and thickness. Furthermore, the sheet can be cut to a width exceeding the cutting width of the cutting bit.

[0026] According to the 11th invention, a method for joining vinyl chloride resin sheets formed by the cutting method according to the 10th invention can be provided. With this joining method, the side edges of adjacent sheets can be joined in a so-called rabbet-like manner, and no steps are created in the overlapping joint portion, allowing for quick joining work on site. [Brief explanation of the drawing]

[0027] [Figure 1] This is an external perspective view of a sheet cutting jig, which is a first embodiment of the present invention. [Figure 2] Figure 1 is a schematic side view showing the internal structure of the sheet cutting jig. [Figure 3] Figure 1 is an overall exploded perspective view showing the sheet cutting jig disassembled into individual units. [Figure 4] Figure 1 is an exploded perspective view of the trimmer mounting unit of the sheet cutting jig shown. [Figure 5] Figure 1 is an exploded perspective view of the sheet feeding unit of the sheet cutting jig. [Figure 6] Figure 1 is an exploded perspective view of the wheel unit of the sheet cutting jig shown. [Figure 7] Figure 1 is an exploded perspective view of the press roller unit of the sheet cutting jig. [Figure 8]Figure 1 is a plan view illustrating the configuration of the sheet cutting jig shown. [Figure 9] This is a schematic side view showing the usage state of a sheet cutting jig, which is a first embodiment of the present invention. [Figure 10] Figure 9 is an explanatory diagram illustrating the usage state of the sheet cutting jig shown above, viewed from the top. [Figure 11] This is a modified version of the guide plate. [Modes for carrying out the invention]

[0028] The following describes preferred embodiments of the sheet cutting jig and joint method of the present invention with reference to the attached drawings, but the present invention is not limited to these embodiments.

[0029] This jig is an attachment used when cutting off the side edges of waterproof sheets or similar materials to a certain width and thickness, and is used by attaching it to an electric tool equipped with a cutting bit. The sheet to be cut is typically a waterproof sheet or flooring sheet, such as a laminated sheet of polyvinyl chloride resin, but it can also be a single-layer sheet of polyvinyl chloride resin used for interior flooring, and the material and application of the sheet are not particularly limited.

[0030] The cutting of the sheet using this jig can be achieved, for example, using an electric trimmer. Electric trimmers are generally used for purposes such as chamfering and grooving wood, but when used with this jig, they are used to cut the sheet to a certain width and thickness using a cutting bit (trimmer bit). In this embodiment, a handheld electric trimmer is used, placed on the floor, which has a cutting bit that is rotated by a battery-powered motor, is mounted on the lower tip (towards the cutting edge of the cutting bit), has an ON / OFF control with a power button and standby button, controls the rotation speed of the cutting bit with an adjustment dial, controls the cutting depth with an adjustment screw, and uses a connected vacuum to suck up and collect the cutting chips. However, it is not limited to this. A suitable electric trimmer for this jig includes a base plate (base protector) positioned perpendicular to the rotation axis of the cutting bit and having a through-hole into which the tip of the bit is inserted, and a position adjustment mechanism that allows adjustment of the amount the bit protrudes from the bottom surface of the base plate (see, for example, paragraphs

[0026] and

[0053] of Japanese Patent Application Publication No. 2011-152752). As will be described later, the presence of a base plate makes it easy to attach to this jig, and the position adjustment mechanism allows for arbitrary adjustment of the cutting thickness (depth) of the sheet. The electric trimmer may be a rechargeable type with a battery or a cable type, and may be made by Makita, Ryobi, Takagi, HiKOKI, or any other manufacturer.

[0031] Next, the configuration and effects of this jig will be specifically described based on the drawing showing the sheet cutting jig 1, which is the first embodiment of this jig. However, the embodiments and examples of the present invention are not limited to the configuration of the sheet cutting jig 1 shown in the figure, and can be modified as appropriate without changing the gist of the present invention. In Figures 2, 9, 8, and 10, the electric trimmer body 21, cutting bit 22 and nozzle hole 23, base plate 24, and insertion hole 25 are shown by dashed lines, and the chip collection cover is omitted from the illustration.

[0032] <Overall Structure> Figure 1 is an external perspective view of a sheet cutting jig, which is a first embodiment of the present invention. Figure 2 is a schematic side view showing the internal configuration of the sheet cutting jig shown in Figure 1. Figure 3 is an exploded perspective view showing the sheet cutting jig shown in Figure 1 disassembled into its units. As shown in Figures 1 to 3, the sheet cutting jig 1 consists of a trimmer mounting unit 4 to which an electric trimmer 2 is attached, a sheet feeding unit 5 provided on the bottom side of the unit 4, a wheel unit 6 provided on the back side of the unit 5, and a pressing roller unit 7 provided on the front side of the trimmer mounting unit 4. In this specification, "back side" refers to the side facing the ground, which is the running surface of the sheet cutting jig 1 when cutting a sheet S using the sheet cutting jig 1, and "front side" refers to the opposite side.

[0033] The sheet cutting jig 1 is a sheet cutting jig that can be attached to and detached from an electric trimmer equipped with a cutting bit, and comprises a cover plate 41, a stage 51 arranged parallel to the cover plate 41, a guide plate 52 provided with a guide surface 521 arranged between them, and front and rear feed rollers 64, 68 attached to the stage 51. More specifically, the sheet cutting jig 1 comprises a cover plate 41 arranged in a direction perpendicular to the rotation axis of the bit 22 and having an opening hole 411 into which the cutting edge of the bit 22 is inserted, a stage 51 arranged parallel to the cover plate 41 and having front wheels 61 and rear wheels 65 with axles 62, 66 arranged parallel to each other on the back side, with a front opening 511 formed in front of the opening hole 411 and a rear opening 512 formed behind the opening hole 411, and a guide surface 521 provided between the cover plate 41 and the stage 51 The stage 51 has a guide plate 52 that forms a gap through which the sheet S, which is the workpiece to be cut, can pass; a front feed roller 64 that is mounted on the back side of the stage 51 with its top protruding from the surface of the front opening 511 and connected to the front wheel 61 via a front gear train 63 and rotates in the opposite direction to the rotation of the front wheel 61; and a rear feed roller 68 that is mounted on the back side of the stage 51 with its top protruding from the surface of the rear opening 512 and connected to the rear wheel 65 via a rear gear train 67 and rotates in the opposite direction to the rotation of the rear wheel 65. The guide surface 521 is arranged in a direction perpendicular to the axles 62 and 66.

[0034] <Effects of sheet cutting jig 1> The sheet cutting jig 1 having the above configuration provides a sheet cutting jig 1 that can easily cut the side edges of a sheet S to a constant width and thickness. That is, with the bit 22 rotating at high speed, the front side of the stage 51 is set as the sheet S feeding side and the rear side of the stage 51 is set as the sheet S delivery side, and by feeding the sheet S between the cover plate 41 and the stage 51 so that the side edges of the sheet S are in contact with the guide surface 521, the side edges of the sheet S can be cut to a constant width (cutting width W of the bit 22) and thickness. Since the stage 51 is provided with wheels 62 and 66, the sheet S can be continuously fed onto the stage 51 by manually moving it in a straight line on a floor or paved surface on which the sheet S is spread out. At this time, the front feed roller 64 which rotates in conjunction with the rotation of the front wheel 61 and the rear feed roller 68 which rotates in conjunction with the rotation of the rear wheel 65 can smoothly feed the sheet S on the stage 51 from the feeding side to the delivery side. Next, the configuration of the sheet cutting jig 1 will be described in detail for each of the units 4, 5, 6, and 7. Note that the sheet cutting jig 1 is one preferred configuration of this jig, and various optional configurations that may be added in addition to the above configuration will also be described.

[0035] <Trimmer mounting unit> Figure 4 is an exploded perspective view of the trimmer mounting unit of the sheet cutting jig shown in Figure 1. The trimmer mounting unit 4 consists of a cover plate 41 and a plurality of block bodies 42.

[0036] The cover plate 41 is a rectangular plate positioned perpendicular to the rotation axis of the bit 22, and has an opening 411 in its center into which the cutting edge (tip) of the bit 22 is inserted. As shown in Figure 4, the cover plate 41 has a plurality of screw holes 414 for fixing the block bodies 42 at predetermined positions. Specifically, each block body 42 has screw holes 412 positioned so as to abut against the respective corners of the base plate 24 placed on the cover plate 41. The base plate 24 has an insertion hole 25 for inserting the cutting bit.

[0037] The cover plate 41 is provided with a front through-hole 413 located forward (towards the front wheels) of the opening hole 411 and penetrating in the thickness direction, and a rear through-hole 414 located behind (towards the rear wheels) of the opening hole 411 and penetrating in the thickness direction. Screw holes 415 for attaching the front retaining roller 71 are provided around the front opening 413, and screw holes 415 for attaching the rear retaining roller 75 are provided around the rear opening 414.

[0038] The block body 42 is fixed to the surface of the cover plate 41. Each block body 42 shown in the figure has the same shape and is a V-shaped fixing member in top view, composed of a first wall portion 421 and a second wall portion 422 provided perpendicular to it. Fastening holes 424 are provided on the top surface of the first wall portion 421, the top surface of the second wall portion 422, and the top surface of the portion where each wall portion 421, 422 intersects perpendicularly. Screw members (not shown) are attached to the fastening holes 424 and screw holes 414 to fasten and fix the block body.

[0039] Each block body 4 is positioned and fixed at each corner of the rectangular area on which the rectangular base plate 24 is placed when viewed from above. More specifically, each block body 4 is positioned so as to abut against the corners of the base plate 24 when it is placed on the cover plate 41. In other words, the first wall portion 421 abuts against one side of the base plate 24, and the second wall portion 422 abuts against the other side of the base plate 24. When the base plate 24 of the electric trimmer 2 is fitted into this area, each block body 4 abuts against each corner of the base plate 24, restricting the horizontal movement of the base plate 24. When the electric trimmer 2 is moved horizontally, the sheet cutting jig 1 also moves horizontally as a unit with it. On the other hand, the sheet cutting jig 1 and the electric trimmer 2 can be easily separated by pulling the electric trimmer 2 upwards. That is, the electric trimmer 2 can be easily attached to and detached from the sheet cutting jig 1.

[0040] <Sheet delivery unit> Figure 5 is an exploded perspective view of the sheet feeding unit of the sheet cutting jig shown in Figure 1. The sheet feeding unit 5 consists of a stage 51, a guide plate 52, and a spacer 53.

[0041] The stage 51 is a rectangular plate, positioned parallel to and opposite the cover plate 41, and equipped with front wheels 61 and rear wheels 65 on its back side with axles positioned parallel to each other. A front opening 511 is formed in front of the opening hole 411, and a rear opening 512 is formed behind the opening hole 411. The front opening 511 is a rectangular opening, and the front feed roller 64 is positioned so that its top protrudes from the surface of the stage 51. Similarly, the rear opening 512 is a rectangular opening of the same shape as the front opening 511, and the rear feed roller 68 is positioned so that its top protrudes from the surface of the stage 51. The front and rear openings 511 and 512 are positioned to open along the guide surface 521 without overlapping the guide plate 52 when the guide plate 52 is in the position closest to the opening hole 411 (initial position) (see Figure 3, and Figure 10(A) described later).

[0042] As shown in Figure 5, the stage 51 is provided with screw holes 513 for fixing the front and rear gear trains 63 and 67, screw holes 514 that communicate with screw holes provided in the spacer 53, and screw holes 515 for fixing the guide plate 52 in its initial position. The width of the stage 51 is set to be the same as the width of the cover plate 41, making the sheet cutting jig 1 more compact.

[0043] The guide plate 52 is a rectangular plate and is positioned between the cover plate 41 and the stage 51. The guide plate 52 has a guide surface 521 on the side of the opening hole 411 to guide the sheet to be cut. The guide plate 52 forms a gap between the cover plate 41 and the stage 51 through which the sheet S to be cut can pass (see Figure 9). In its initial position, the guide plate 52 is closest to the bit 22 of the electric trimmer 2 when it is attached to the sheet cutting jig 1. The guide surface 521 is one side of the guide plate 52 and is positioned perpendicular to the axles 62 and 66 (the straight direction of the sheet cutting jig 1). The guide plate 52 is narrower in width (parallel to the axles) than the cover plate 41 and the stage 51, and is located outside the opening hole 411 (right side in Figure 1, top of Figure 10). Cutting is performed while guiding the sheet along the guide surface 521.

[0044] The thickness of the guide plate 52 is preferably set to be slightly greater than the thickness of the sheet S to suppress deflection of the sheet S as it passes between them. The longitudinal dimension of the guide plate 52 is preferably set to be longer than the longitudinal dimension of the cover plate 41 and shorter than the longitudinal dimension of the stage 51, and the ends of the guide plate 52 are positioned so that they protrude from both sides of the cover plate 41 (see Figure 1). These ends can be gripped to move the guide plate 52 in the width direction of the stage 51. The guide plate 52 is a member that is detachably screwed to the cover plate 41 and the stage 51, and can be replaced with other guide plates of different thicknesses to match the thickness of the sheet S.

[0045] The guide plate 52 is provided with multiple elongated holes 522 of the same shape that extend in a direction parallel to the axles 62 and 66. Each elongated hole 522 is formed to have an internal dimension that allows a spacer 53 to be placed inside. Each elongated hole 522 is formed parallel to the others at a certain interval, allowing the guide plate 52 to move parallel to the width direction of the stage 51.

[0046] The spacers 53 are all the same shape and one is placed in each of the elongated holes 522 (see Figure 3). Each spacer 53 is provided with a screw hole 531, and by fastening it with fastening members (not shown) inserted into the screw holes 416, 531, and 514, the guide plate 52 can be sandwiched and fixed between the cover plate 41 and the stage 51. Therefore, when the fastening is loosened by the fastening members, and the end of the guide plate 52 is grasped and force is applied in a direction to pull it out from the surface of the stage 51, each spacer 53 moves relative to each of the elongated holes 522, causing the guide plate 52 to slide in the width direction.

[0047] The guide plate 52 is slidable in the axle axis direction 62, 66 within the range in which the spacer 53 can move through the elongated hole 522, and can be fixed by inserting fastening members (not shown) into the screw holes 416, 531, 514 and tightening them, thereby sandwiching it between the cover plate 41 and the stage 51.

[0048] <Wheel Unit> Figure 6 is an exploded perspective view of the wheel unit of the sheet cutting jig shown in Figure 1. The wheel unit 6 consists of a front wheel unit 6A and a rear wheel unit 6B. The front wheel unit 6A consists of a pair of front wheels 61, an axle 62 connecting the front wheels 61, a pair of front gear trains 63, a front feed roller 64 and a shaft 641. The rear wheel unit 6B consists of a pair of rear wheels 65, an axle 66 connecting the rear wheels 65, a pair of rear gear trains 67, a rear feed roller 68 and a shaft 681.

[0049] In the illustrated configuration, the front wheel unit 6A has a pair of front wheels 61 arranged at a constant distance from each other, and each front wheel 61 is connected by an axle 62. A pair of front gear trains 63 are arranged between these front wheels 62. The axle 62 passes through the case body 633 of the front gear train 63. A front feed roller 64 is arranged on the rear wheel side of the axle 62 and between the pair of front gear trains 63. The shaft 641 of the front feed roller 64 is pivotally supported at both ends by each case body 633. Screw holes 634 are provided on the upper surface of the case body 633 for fixing the case body 633 into which the front gear train 63 is incorporated on the stage 51.

[0050] The case 633 of the front gear train 63 incorporates a first gear 631 and a second gear 632 (see Figure 2). The first gear 631 is mounted on the axle 62, and the second gear 632 is mounted on the shaft 641. The first gear 631 and the second gear 632 are meshed, and therefore the front feed roller 64 rotates in the opposite direction to the rotation of the front wheel 61 (see Figure 9, which will be described later).

[0051] The front feed roller 64 is connected to the front wheel 61 via the front gear train 63 and rotates in the opposite direction to the rotation of the front wheel 61. In the illustrated configuration, the front feed roller 64 is supported by a shaft 641 and a case body 633, and the case body 633 of the front gear train 63 is attached to a predetermined position on the back side of the stage 51, so that its top protrudes from the surface of the front opening 511. Similarly, the rear feed roller 68 is connected to the rear wheel 65 via the rear gear train 67 and rotates in the opposite direction to the rotation of the rear wheel 65.

[0052] The rear wheel unit 6B has a case 673 for the rear gear train 67, into which the first gear 671 and the second gear 672 are incorporated (see Figure 2). The first gear 671 is mounted on the axle 66, and the second gear 672 is mounted on the shaft 681. The first gear 671 and the second gear 672 mesh, causing the rear feed roller 68 to rotate in the opposite direction to the rotation of the rear wheel 65 (see Figure 9, described later). The top surface of the case 673 is provided with screw holes 674 for fixing the case 673, into which the rear gear train 67 is incorporated, to the back surface of the stage 51. The rest of the configuration of the rear wheel unit 6B is the same as that of the front wheel unit 6A described above, so the explanation is omitted.

[0053] The rotational force of the front feed roller 64, which rotates in conjunction with the rotation of the front wheel 61, and the rear feed roller 68, which rotates in conjunction with the rotation of the rear wheel 65, acts in the direction of the sheet S on the stage 51 from the feeding side to the discharging side, thereby enabling the sheet S to be fed out smoothly. The amount of protrusion of the tops of each feed roller 64, 68 (the amount of protrusion from the surface of each opening 511, 512) is set to a length suitable for feeding the sheet S from the front wheel side to the rear wheel side.

[0054] Preferably, the front gear train 63 and the rear gear train 67 are provided on the back side of the stage 51 as shown in the figure. This allows the upper surface of the stage 51 over which the sheet S passes to be flat, making cutting easier. More preferably, the front gear train 63 is configured such that the ratio of the rotational speed of the front wheel 61 to the rotational speed of the front feed roller 64 is 1:1, and the rear gear train 67 is configured such that the ratio of the rotational speed of the rear wheel 65 to the rotational speed of the rear feed roller 68 is 1:1.1. With this configuration, the number of teeth on each gear is adjusted so that the ratio of the rotational speeds of the front feed roller 64 to the rear feed roller 68 is 1:1.1. The rotational speed of the rear feed roller only needs to be slightly faster than that of the front feed roller, and the ratio of rotational speeds may be, for example, 1:1.05 to 1:1.15. By setting the rotational speed of the rear feed roller 68 to be slightly (approximately 1.1 times) higher than that of the front feed roller 64, a tensile force can be applied to the sheet S between the feed rollers 64 and 68 where the bit 22 is positioned. This allows the sheet S to be cut while stretched, resulting in a better finish. Note that the above ratio is not limited to any other ratio and can be adjusted as needed to achieve a rotational speed suitable for applying a suitable tensile force to the sheet S between the feed rollers 64 and 68.

[0055] <Pressing roller unit> Figure 7 is an exploded perspective view of the presser roller unit of the sheet cutting jig shown in Figure 1. The presser roller unit 7 consists of a front presser roller unit 7A and a rear presser roller unit 7B.

[0056] The front pressing roller unit 7A includes a front pressing roller 71, a shaft 75 inserted into the roller 71, front bearings 73 attached to both ends of the shaft 75, a pair of front holders 74 into which the front bearings 73 are incorporated, and a front spring member 72 incorporated between the front bearings 73 and the front holders 74. The front holders 74 are provided with grooves into which the front spring member 72 and the front bearings 73 are incorporated, and mounting holes 741 are provided on their upper surfaces. The rear pressing roller unit 7B includes a rear pressing roller 75, a shaft inserted into the roller 75, rear bearings attached to both ends of the shaft, a pair of rear holders into which the rear bearings are incorporated, and a rear spring member incorporated between the rear bearings and the rear holders, but its specific configuration is the same as that of the front pressing roller unit 7A, so a description is omitted.

[0057] As shown in Figure 3, the cover plate 41 is provided with a front through-hole 413 located on the front wheel 61 side of the opening hole 411 and penetrating in the thickness direction, and a rear through-hole 414 located on the rear wheel 65 side of the opening hole 411 and penetrating in the thickness direction. The front pressing roller 71 is mounted on the front side of the cover plate 41 with its bottom protruding from the back surface of the front through-hole 413, and its axis of rotation (shaft 75) is arranged parallel to the axles 62 and 66. Similarly, the rear pressing roller 75 is mounted on the front side of the cover plate 41 with its bottom protruding from the back surface of the rear through-hole 414, and its axis of rotation (shaft) is arranged parallel to the axles 62 and 66.

[0058] The front spring member 72 biases the front pressing roller 71 toward the stage 51 by pressing both ends of the rotating shaft (shaft 75) of the front pressing roller 71 toward the stage 51 when the front holder 74 is fixed to the stage 51. Similarly, the rear spring member biases the rear pressing roller 75 toward the stage 51 by pressing both ends of the rotating shaft (shaft) of the rear pressing roller 75 toward the stage 51 when the rear holder is fixed to the stage 51. With this configuration, the sheet S on the stage 51 can be pressed toward the stage 51 by the front and rear pressing rollers 71 and 75, and the side edges of the sheet S can be cut while suppressing the deflection of the sheet S as it passes over the stage 51, resulting in a good finish.

[0059] The front pressing roller 71 is preferably positioned directly above the front pressing roller 64, in other words, so that the rotation axes of the respective rollers 64 and 71 are aligned on the same vertical line (see Figure 2, etc.). Similarly, the rear pressing roller 76 is preferably positioned directly above the rear pressing roller 68, in other words, so that the rotation axes of the respective rollers 68 and 76 are aligned on the same vertical line (see Figure 2, etc.). The sheet S can be fed out by being sandwiched between the rollers from above and below.

[0060] Various electric trimmers can be attached to the sheet cutting jig 1 without changing the gist of the present invention, but it is preferable that a chip collection cover (not shown) is attached which has a nozzle hole 23 connected to a dust collector 3 and communicates with the opening 23. When using such an electric trimmer, the inner diameter of the opening 411 of the cover plate 41 is set to a size that allows chips generated when the sheet S is cut with the bit 22 to pass through. This makes it possible to cut the sheet S while sucking and collecting the chips generated by cutting the sheet S through the opening 411 of the cover plate 41.

[0061] <Usage> Next, the usage of the sheet cutting jig 1 and the operation of each component will be described. Figure 8 is a plan view illustrating the configuration of the sheet cutting jig shown in Figure 1. First, as preparation, the base plate 24 of the electric trimmer 2 is fitted into the mounting area of ​​the base plate 24 surrounded by each block body 4 on the assembled sheet cutting jig 1 (see Figures 1 and 8). Next, on a floor or paved surface on which the sheet S is spread out, with the end of the sheet S inserted between the cover plate 41 and the stage 51, the electric trimmer 2 is operated to rotate the bit 22 at high speed. Then, the electric trimmer body 21 is manually driven in a straight line along the Se of the sheet S so that the side edge Se of the sheet S contacts the guide surface 521, thereby sequentially feeding the sheet S between the cover plate 41 and the stage 51 for cutting.

[0062] Figure 9 is a schematic side view showing the usage state of a sheet cutting jig, which is the first embodiment of the present invention. Figure 10 is an explanatory diagram schematically showing the usage state of the sheet cutting jig shown in Figure 9 from a top view. Figure 10(A) shows the cutting state of the first turn, and Figure 10(B) shows the cutting state of the second turn. In Figure 9, the arrows attached to the wheels 61, 65, feed rollers 64, 68, and press rollers 71, 76 respectively indicate the direction of rotation. When the sheet cutting jig 1 is moved forward (to the left of the paper in the case of Figure 9), the feed rollers 64, 68, which rotate in the opposite direction to the rotation direction of the wheels 61, 65, feed out the sheet S on the stage 51.

[0063] If the width of the side edge of the sheet S to be cut off is greater than the cutting width W of the bit 22, as shown in Figure 10, after the first cut (see Figure (A)), the guide plate 52 is slid to change the cutting position relative to the sheet S, and then the second cut is performed (see Figure (B)).

[0064] Specifically, in the first cutting pass, the spacer 53 is in contact with one inner surface 522b in the longitudinal direction (width direction of the guide plate 52) of the elongated hole 522, so that the guide plate 52 is close to the bit 22 (in its initial position) when the cutting operation is performed. Next, in the second cutting pass, the spacer 53 is in contact with the other inner surface 522a of the elongated hole 522, so that the guide plate 52 is separated from the bit 22 when the cutting operation is performed. Here, by pre-setting the amount of slide of the guide plate 52, in other words, the amount of movement of the spacer 53 from one inner surface 522b to the other inner surface 522a, to be equal to or slightly shorter than the cutting width W of the bit 22, after cutting a cutting width W from the side edge Se of the sheet S in the first cutting pass (see Figure 10(A)), the second cutting pass can perform cutting a further cutting width W from the cutting location of the first pass.

[0065] <Method for cutting sheets> Next, a sheet cutting method according to the present invention will be described. The sheet cutting method of the present invention is a sheet cutting method using a sheet cutting jig having a cover plate arranged in a direction perpendicular to the rotation axis direction of a cutting bit and having an opening hole into which the blade portion of the cutting bit is inserted, a stage arranged parallel to and opposite to the cover plate, and a guide plate arranged between the cover plate and the stage and having a guide surface that is slidable in the width direction of the stage, and includes a first step of fixing the position of the guide plate relative to the stage, a second step of rotating the cutting bit at high speed, a third step of sequentially feeding the sheet between the cover plate and the stage so that its edge contacts the guide surface, thereby cutting the sheet in a strip shape with the cutting width W of the cutting bit, and a fourth step of stopping the rotation of the bit after performing the third step, and repeating the process of performing the first to fourth steps after performing a step of moving the guide plate away from the bit with a sliding width of less than or equal to the cutting width W of the bit until the edge portion of the sheet has been cut to a desired width. Note that the direction away from bit 22 refers to the direction toward the outward direction of stage 51, as shown in Figure 10(B).

[0066] The sheet cutting method according to the present invention can be realized using the sheet cutting jig 1 shown in Figures 1 to 10. Specifically, as the first step, the position of the guide plate 52 relative to the stage 51 is fixed. Specifically, the guide plate 52 is fixed in a predetermined position by inserting fastening members (not shown) into screw holes 416, 531, and 514 and tightening them. Next, as the second step, the cutting bit 22 is rotated at high speed, and as the third step, the sheet S is sequentially fed between the cover plate 52 and the stage 51 so that its edge Se contacts the guide surface 521, thereby cutting the sheet S in a strip shape with the cutting width W of the cutting bit 22. After performing this third step, as the fourth step, the rotation of the bit 22 is stopped. If it is necessary to cut the edge of the sheet S to a desired width, the process of moving the guide plate 52 away from the bit 22 with a slide width less than or equal to the cutting width W of the bit 22 is performed, and then the process of performing the first to fourth steps is repeated. Furthermore, by performing steps 1 to 4 each time the guide plate 52 is moved with a sliding width less than or equal to the cutting width W, the sheet can be cut with a width exceeding the cutting width of the cutting bit 22.

[0067] For example, a sheet with an overall width of approximately 1200mm to 1820mm is cut at both ends for a length of approximately 9 to 10m using this method. The sheet thickness is, for example, approximately 2.0mm, and this method is used to cut a portion of both ends in the width direction to about half its thickness. For waterproofing sheets (e.g., 1200mm wide and 10m long), the cutting width is 40mm, and for interior flooring sheets (e.g., 1820mm wide and 9m long), the cutting width is approximately 10 to 20mm. After cutting using this method, one end in the width direction has a width of 10 to 40mm and the upper half has been cut, and the other end in the width direction has a width of 10 to 40mm and the lower half has been cut. In this embodiment, a sheet cutting jig is detachably attached to the body of an electric trimmer for cutting, but it may also be possible to cut using an electric trimmer with the sheet cutting jig integrated into the main body.

[0068] <Method of joining sheets> Next, the sheet joining method according to the present invention will be described. The sheet joining method according to the present invention is a method of joining the side edges of adjacent sheets in a so-called rabbet joint. A lower side edge is formed on the front edge of one sheet by cutting it to a certain width and thickness using the aforementioned sheet cutting method, and an upper side edge is formed on the back edge of the other sheet by cutting it to a certain width and thickness using the aforementioned sheet cutting method. Then, with the upper side edge of the other sheet overlapping the lower side edge of the one sheet, the lower side edge and the upper side edge are welded together, thereby joining one sheet and the other sheet at their respective edges. Suitable welding methods include, for example, liquid welding (for example, liquid welding using a welding solution specifically for polyvinyl chloride) or heat welding with hot air. Welding may also be performed by, for example, joining by pressure using a solvent.

[0069] Preferably, the method for joining the sheets is such that when they are joined in a rabbet-like manner, no step is created at the joint, the width dimensions of the upper edge and the lower edge are approximately the same, and the total thickness when the upper edge is overlapped and bonded or welded to the lower edge is approximately the same as the thickness of the uncut portion of the sheet S.

[0070] According to this embodiment, unprocessed sheets can be quickly and accurately processed on-site and joined in a so-called rabbet joint. There is no need to manufacture sheets with thin sections (upper and lower edges) on the side edges in advance at the manufacturing plant, making them easy to handle during transportation, and on-site cutting can be done quickly and easily even by inexperienced individuals. Moreover, no steps are created in the overlapping joint area, allowing for quick joining work on-site. There is no risk of people tripping, walking is smooth, and dirt such as sand and dust is less likely to accumulate in the stepped area, so it is less likely to leave dirt marks and is aesthetically superior. It also prevents bulging when artificial turf or protective panels are placed on top. Furthermore, unlike simple bonding of end faces, moisture is less likely to reach the bottom, so water resistance problems are less likely to occur, and it has high watertightness and does not impair the waterproofing effect. In addition, the welding area is larger, resulting in superior strength. In laminated vinyl chloride resin sheets used for waterproofing, a reinforcing material made of glass cloth or resin mesh is sandwiched between the lower and upper layers. However, because it is easy to cut and join the sheets up to any desired layer, the joints can be made without compromising strength. Furthermore, because it is a lap joint, there is no risk of gaps forming due to deterioration over time.

[0071] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. Furthermore, the components of each of the above embodiments can be arbitrarily combined without departing from the spirit of the invention.

[0072] Figure 11 shows a modified example of the guide plate. The guide plate 52' shown in Figure 11 is a modified example of the guide plate 52, and a recessed portion 521a is provided on the guide surface 521 in a location close to the opening 411. In order to cut the edge Se of the sheet S, it is necessary to bring the bit 22 and the guide surface 521 close together, but by providing the recessed portion 521a, contact between the bit 22 and the guide plate 52 can be avoided.

[0073] Furthermore, for example, while the material of the cover plate 41, stage 51, and guide plate 5 is not limited as long as they have a certain strength, manufacturing them all from metal can increase the strength of the sheet cutting jig 1, improve durability, and allow for miniaturization of the sheet cutting jig 1. In addition, the length of the elongated hole that defines the sliding width of the guide plate 52 can be arbitrarily set according to the width dimension of the joint (connecting part) of the sheet S. [Industrial applicability]

[0074] The electric trimmer jig according to the present invention can be used when attempting to trim the side edge of a sheet to a certain width and thickness. [Explanation of symbols]

[0075] 1. Jig for electric trimmer 2 Electric trimmer 21 Electric Trimmer Body 22-bit 23 nozzle holes 24 base plate 25 Through hole 3. Dust collector 4 Trimmer mounting unit 41 Cover Plate 411 Opening hole 412 screw holes 413 Front through-hole 414 Rear through-hole 415 screw holes 416 screw holes 42 Block letters 421 1st wall section 422 2nd wall section 423 Top surface 424 fastening holes 5 Sheet Dispensing Unit 51 stages 511 Front opening 512 Rear opening 513 screw holes 514 screw holes 515 Fixing hole 52 Guide Plate 521 Guide surface 522 Slotted hole 523 mounting holes 53 Spacer 531 screw holes 6-wheel unit 61 Front Wheel 62 Axle (front wheel side) 63 Front gear train 631 First gear 632 Second gear 633 Case Body 634 screw holes 64 Front feed rollers 641 Shaft 65 Rear wheel 66 Axle (rear wheel side) 67 Rear gear train 671 First gear 672 Second gear 673 Case Body 674 screw holes 68 Rear feed roller 7 Pressing roller unit 71 Front pressing roller 72 Front spring member 73 Front bearing 74 Front holder 741 Mounting holes 75 shaft 76 Rear retaining roller S Seat Se sheet side edge C Cutting part (thin wall part)

Claims

1. A sheet cutting jig that attaches to an electric trimmer equipped with a cutting bit, A cover plate is positioned perpendicular to the rotation axis of the cutting bit and has an opening for inserting the cutting edge of the cutting bit, A stage comprising front and rear wheels arranged parallel to and opposite the cover plate, with axles arranged parallel to each other on the back side, a front opening formed forward of the opening hole, and a rear opening formed backward of the opening hole, A guide plate is positioned between the cover plate and the stage, with a guide surface provided on the side of the opening hole for guiding the sheet, which is the workpiece to be cut, and forming a gap between the cover plate and the stage through which the sheet can pass. The top portion is attached to the back side of the stage with the surface of the front opening protruding from the front, and is connected to the front wheel via a front gear train, and the front feed roller rotates in the opposite direction to the rotation direction of the front wheel, A rear feed roller is attached to the back side of the stage with its top portion protruding from the surface of the rear opening, and is connected to the rear wheel via a rear gear train, and rotates in the opposite direction to the rotation direction of the rear wheel. A sheet cutting jig characterized by having the following features.

2. The sheet cutting jig according to claim 1, characterized in that it is detachably attached to the electric trimmer, and the guide surface is the side surface of the guide plate and is in a direction perpendicular to the axle.

3. The sheet cutting jig according to claim 1, characterized in that the guide plate is provided with an elongated hole extending in a direction parallel to the axle, and a spacer for fixing to the cover plate and / or the stage is arranged in the elongated hole.

4. The cover plate has a front through-hole located forward of the opening and a rear through-hole located backward of the opening. The bottom portion is attached to the front surface side of the cover plate with the bottom portion protruding from the back surface of the front through-hole, and the front pressing roller has a shaft positioned parallel to the axle, The bottom portion is attached to the front surface of the cover plate with the bottom portion protruding from the back surface of the rear through-hole, and the rear pressing roller is positioned parallel to the axle, A front spring member biases the front pressing roller toward the stage by pressing both ends of the shaft of the front pressing roller toward the stage, A rear spring member biases the rear press roller toward the stage by pressing both ends of the shaft of the rear press roller toward the stage, A sheet cutting jig according to claim 1, characterized by having the following features.

5. The sheet cutting jig according to claim 1, characterized in that the front gear train is configured such that the ratio of the rotational speed of the front wheel to the rotational speed of the front feed roller is 1:1, and the rear gear train is configured such that the ratio of the rotational speed of the rear wheel to the rotational speed of the rear feed roller is 1:1.

1.

6. An electric trimmer characterized by having a sheet cutting jig as described in claim 1 on its lower end, a cutting bit that is rotated by a motor, and a base plate mounted on the lower end of the electric trimmer that has an insertion hole for the cutting bit, and a protrusion amount adjustment mechanism for adjusting the amount of protrusion of the cutting bit from the insertion hole.

7. Multiple block bodies are fixed to the surface of the cover plate, in which they contact each corner of the base plate when it is placed on the cover plate, thereby restricting the horizontal movement of the base plate. The electric trimmer according to claim 6, characterized in that the opening hole of the cover plate is provided at a position that communicates with the insertion hole of the base plate when the base plate is placed in the area surrounded by the block body on the cover plate.

8. A method for cutting a sheet using a sheet cutting jig according to any one of claims 1 to 5 or an electric trimmer according to any one of claims 6 to 7, comprising a first step of fixing the position of the guide plate relative to the stage, The second step involves rotating the cutting bit at high speed, A third step involves sequentially feeding the sheet between the cover plate and the stage so that its edges contact the guide surface, thereby cutting the sheet into a strip shape with the cutting width W of the cutting bit using the cutting bit, After performing the third step, the fourth step is to stop the rotation of the cutting bit, Includes, Until the edges of the aforementioned sheet are cut to the desired width, A method for cutting a sheet, characterized by performing the step of moving the guide plate away from the cutting bit with a slide width less than or equal to the cutting width W of the cutting bit, and then repeatedly performing the first to fourth steps.

9. A lower edge is formed on the edge of a vinyl chloride resin sheet by cutting off a certain width and thickness from the surface edge using the sheet cutting method described in claim 8. An upper edge portion is formed on the edge portion by cutting off the back edge portion of another sheet of polyvinyl chloride resin to a certain width and thickness using the sheet cutting method described in claim 8. A method for joining sheets, characterized in that the upper edge of the other sheet is superimposed on the lower edge of the first sheet, and the lower edge and the upper edge are welded together by liquid or hot air to join the first sheet and the other sheet at their respective edges.

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