Long ruler positioning device

Abstract

To improve detachability of a short guide added to a parallel guide used in positioning a long ruler in parallel to a work piece as the long ruler is used in cutting and processing using a portable circular saw.SOLUTION: A parallel guide 10 has a first guide 20 movable along a rail 13 of a base 11 and a short guide 30 attachable to the first guide 20. The short guide 30 is attachable to / detachable from the base 11 independently from the first guide 20. This allows the short guide 30 to attach to / detach from the base 11 while supporting the first guide 20 to the rail 13. Thus, detachability of the short guide 30 is improved.SELECTED DRAWING: Figure 17

Description

[Technical Field]

[0001] The present disclosure relates to a guide rail positioning device that positions a guide rail used when cutting or processing a workpiece such as wood using a portable processing machine such as a portable circular saw. [Background technology]

[0002] For example, a long ruler is used to guide a cutting tool parallel to or at a certain angle to the end face of a workpiece. The long ruler has a long, rectangular, flat plate shape. The long ruler is used by placing it on the top surface of the workpiece. A portable processing machine is placed on top of the long ruler. The portable processing machine is precisely guided in the processing direction along the guide portion of the long ruler. Several types of guide members can be attached to the long ruler.

[0003] Patent Document 1 discloses an inclination aid for positioning a long ruler at a fixed angle relative to the end face of a workpiece. Patent Document 2 discloses a parallel guide for positioning a long ruler parallel to the end face of a workpiece. Two parallel guides are used as a set, attached at an appropriate interval in the longitudinal direction of the long ruler. The guide members of the two sets of parallel guides abut against the end face of the workpiece. By aligning the distances from the base ends of the guide members of the two sets, the long ruler is positioned parallel to the end face of the workpiece. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-30659 [Patent Document 2] U.S. Patent No. 10,843,368 Summary of the Invention [Problem to be solved by the invention]

[0005] There were some machining methods that could not be handled with conventional guide members. With parallel guides, it is expected that the guide member will not be able to abut the end face of the workpiece when the machining location is close to the end face of the workpiece. For example, if the distance from the end face of the workpiece to the machining location is shorter than the width of the long ruler, the end face of the workpiece will be positioned below the long ruler, making it impossible for the guide member to abut the end face of the workpiece. There was also room for improvement in the method of attaching and detaching the guide member. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, a long ruler is positioned along the surface of a workpiece, for example, by a long ruler positioning device. The long ruler positioning device has, for example, a base connected to the long ruler and extending from the long ruler. The long ruler positioning device has, for example, a first guide attached to the base and abutting against the end surface of the workpiece to determine the long ruler in a first position. The long ruler positioning device has, for example, a second guide attached to the base or the first guide and abutting against the end surface of the workpiece to determine the long ruler in a second position. For example, the second guide is detachable from the base independently of the first guide.

[0007] Therefore, by making the first guide and the second guide detachable, the range of application of processing methods using a long ruler is expanded. Also, the ease of attaching and detaching the first guide and the second guide is improved. [Brief explanation of the drawings]

[0008] [Figure 1] This is a plan view of the long ruler and parallel guides. This figure shows the state in which the long ruler is positioned at the first position by abutting the first guide against the end face of the workpiece. [Figure 2] 2 is a view taken along the arrow II in FIG. 1, and is a front view of the parallel guide. [Figure 3] FIG. [Figure 4]1 is a plan view of the long ruler and parallel guides, showing the state in which the long ruler is positioned at the second position using the short guides. [Figure 5] 5 is a view taken along the arrow V in FIG. 4, and is a front view of the parallel guide. [Figure 6] FIG. 5 is an enlarged view of part VI in FIG. [Figure 7] 7 is a cross-sectional view taken along line VII-VII in FIG. 6, and is a vertical cross-sectional view of the vicinity of the connection of the parallel guides. [Figure 8] 8 is a view taken along the arrow VIII in FIG. 7 and is a bottom view of the short guide. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 6, and is a vertical cross-sectional view of the first guide. [Figure 10] FIG. [Figure 11] 11 is a rear view of the first guide as seen from the direction of arrow XI in FIG. 10. [Figure 12] 12 is a cross-sectional view taken along line XII-XII in FIG. 11, showing a vertical cross-sectional view of the first guide. [Figure 13] FIG. [Figure 14] 14 is a view taken along the arrow XIV in FIG. 13 and is a plan view of the short guide. [Figure 15] FIG. 14 is a view taken along the arrow XV in FIG. 13 and is a rear view of the short guide. [Figure 16] 16 is a view taken along the arrow XVI in FIG. 13 and is a bottom view of the short guide. [Figure 17] 10A and 10B are perspective views showing a procedure for attaching the short guide. [Figure 18] 10 is a bottom view showing the procedure for installing the short guide. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, the long ruler positioning device includes a locking mechanism that secures the first guide to, for example, the base. For example, the locking mechanism also secures the second guide to, for example, the base. This simplifies the locking mechanism.

[0010] In one or more embodiments, the base is provided with rails that support the first guide and the second guide so that they can move toward and away from the long ruler, for example, thereby allowing the first guide and the second guide to move smoothly relative to the long ruler.

[0011] In one or more embodiments, the first guide is provided with an engagement member that engages with the second guide that moves, for example, along a rail, thereby restricting movement of the second guide relative to the first guide.

[0012] In one or more embodiments, the engagement member is provided movably relative to the first guide between, for example, an engagement position where it engages with the second guide and a retracted position where it is retracted from the second guide. The second guide is provided with an engagement retraction portion that pushes the engagement member when it moves, for example, along a rail, to move the engagement member from the engagement position to the retracted position. Therefore, the engagement retraction portion of the second guide retracts the engagement member of the first guide from the engagement position to the retracted position. This allows the engagement member to smoothly engage with the second guide as the second guide moves.

[0013] In one or more embodiments, for example, the engagement retraction portion is provided at the end of the second guide and has an inclined surface or a curved surface that is inclined relative to the direction of movement along the rail, thereby allowing the engagement member to move smoothly to the retracted position.

[0014] In one or more embodiments, for example, bases are connected to two locations in the longitudinal direction of the ruler. By matching the positions of the first guides on the two bases, the ruler is positioned parallel to the end face of the workpiece. This allows the ruler to be quickly and accurately positioned at the first position relative to the end face of the workpiece.

[0015] In one or more embodiments, for example, bases are connected to two locations in the longitudinal direction of the long ruler. The positions of the second guides on the two bases are aligned with each other, and the tips of the second guides are brought into contact with the end surface of the workpiece below the long ruler, thereby positioning the long ruler parallel to the end surface of the workpiece. This allows the long ruler to be quickly and accurately positioned at the second position relative to the end surface of the workpiece.

[0016] In one or more embodiments, a length scale indicating the position of at least one of the first guide and the second guide is provided, for example, on the side of the base. This allows the length scale to be easily seen from the side, allowing for quick and accurate positioning of the ruler.

[0017] In one or more embodiments, a length scale indicating the position of at least one of the first guide and the second guide is provided, for example, on the top surface of the base. This allows the long ruler to be positioned quickly and accurately using the length scale that is easily visible from above.

[0018] In one or more embodiments, for example, the second guide is provided below the base. For example, the second guide is supported without protruding from the base when viewed from above. This allows the second guide to be made compact. Therefore, the long ruler positioning device can be made compact. [Example]

[0019] As shown in Figures 1 to 5, the ruler 1 has a rectangular, flat plate shape. The working edge 1a (left edge in Figure 1) and the non-working edge 1b (right edge in Figure 1) of the ruler 1 are parallel to each other. The ruler 1 is placed on the top surface of the workpiece W. A first guide rail 2 and a second guide rail 3 are provided on the top surface of the ruler 1. The first guide rail 2 and the second guide rail 3 are arranged parallel to each other in the longitudinal direction from the front end to the rear end and parallel to the working edge 1a. For example, a portable circular saw 5 is placed on the top surface of the ruler 1. The portable circular saw 5 is guided back and forth along the first guide rail 2. As a result, the cutting tool 5a of the portable circular saw 5 is guided along the working edge 1a of the ruler 1. Here, the cutting tool 5a is a circular saw blade known as a chip saw. Therefore, by aligning the edge 1a of the ruler 1 on the cutting side with the corner line, the cutting tool 5a is guided along the corner line, thereby enabling precise cutting.

[0020] When cutting parallel to the end face We of the workpiece W, the edge 1a of the ruler 1 on the processing side must be positioned parallel to the end face We of the workpiece W. When positioning the ruler 1 parallel to the end face We of the workpiece W, a ruler positioning device called a parallel guide (hereinafter also referred to as parallel guide 10) is used. As shown in the figure, two sets of parallel guides 10 are usually used. The two sets of parallel guides 10 have the same configuration.

[0021] The two sets of parallel guides 10 are connected to the second guide rails 3 of the long ruler 1. In this embodiment, the right end face of the second guide rail 3 forms the edge 1b of the long ruler 1 on the non-processing side. The parallel guides 10 are connected to any position in the front-to-rear direction along the second guide rail 3. The two sets of parallel guides 10 are connected to the second guide rails 3 at an appropriate distance from each other in the front-to-rear direction.

[0022] The parallel guide 10 has a base 11, a first guide 20, and a second guide 30. The base 11 is connected to the second guide rail 3 of the long ruler 1 and extends from the long ruler 1. The first guide 20 is attached to the base 11 and abuts against the end face We of the workpiece W. This positions the long ruler 1 at the first position shown in FIG. 1. The second guide 30 is attached to the first guide 20 and abuts against the end face We of the workpiece W. This positions the long ruler 1 at the second position shown in FIG. 4.

[0023] The base 11 has a connecting part 12 and a rail 13. Two fixing screws 12a are provided on the connecting part 12. As shown in FIG. 7, by tightening the fixing screws 12a into a fixed plate 12c inserted into the second guide rail 3 of the long ruler 1, the connecting part 12 can be fixed at any position along the second guide rail 3. By loosening the two fixing screws 12a, the connecting part 12 can slide along the second guide rail 3 of the long ruler 1.

[0024] The long rail 13 extends to the right from the connecting part 12. The left end of the rail 13 is joined to the connecting part 12 by tightening a fixing screw 12b. The bottom surfaces of the connecting part 12 and the rail 13 are aligned flush with the bottom surface of the long ruler 1.

[0025] The first guide 20 is supported by the rail 13 of the base 11. As shown in FIGS. 9 to 12, the first guide 20 has a generally block shape and is supported so as to be slidable along the rail 13. As shown in FIGS. 10 to 12, the first guide 20 has a main body 21, an engaging member 22, a support shaft 23, and a torsion spring 24.

[0026] The main body 21 has a rectangular flat top plate 21a, a front wall 21b, and two support columns 21c. The top plate 21a, the front wall 21b, and the support columns 21c are integral with one another. An insertion hole 21d is provided in the center of the top plate 21a. A fixing screw 25 for fixing the first guide 20 to the rail 13 is inserted into the insertion hole 21d.

[0027] The front wall portion 21b protrudes downward from the front edge of the top plate portion 21a with the same width in both directions. The left and right support pillars 21c each have a rectangular column shape. The two support pillars 21c protrude downward from the rear edge of the top plate portion 21a. The two support pillars 21c are arranged at a fixed distance from each other on the left and right.

[0028] One engaging member 22 is supported between two support columns 21c. One support shaft 23 is supported by spanning between the two support columns 21c. The support shaft 23 has a shoulder screw 23a and a nut 23c. A male thread is formed at the tip of the shoulder screw 23a. A cylindrical portion with a diameter larger than the thread diameter of the male thread is provided between the male thread and the screw head. A nut 23c is tightened onto the male thread of the shoulder screw 23a to prevent the support shaft 23 from falling off the support column 21c. The engaging member 22 is supported via the support shaft 23 so that it can rotate back and forth. One torsion spring 24 is interposed between the engaging member 22 and the rear end surface of the top plate portion 21a. The torsion spring 24 urges the engaging member 22 toward the engaged position (counterclockwise in Figure 12). The torsion spring 24 is housed in a recess 22 a provided in the engaging member 22 .

[0029] An operating portion 22b is provided on the upper part of the engaging member 22. The operating portion 22b protrudes rearward. An engaging protrusion 22c is provided on the lower part of the engaging member 22. The engaging protrusion 22c protrudes forward. As shown in FIG. 12, when the operating portion 22b is pushed up with a fingertip against the torsion spring 24, the engaging member 22 is displaced in a direction in which the engaging protrusion 22c retracts from below the top plate 21a (towards the retracted position). When the pushing-up operation of the operating portion 22b is released, the engaging member 22 is displaced by the biasing force of the torsion spring 24 towards the engaging position side, where the engaging protrusion 22c advances below the top plate 21a.

[0030] As shown in Figures 3, 9, and 17, a groove-shaped first rail 13a is provided on the upper surface of the rail 13. A groove-shaped second rail 13b is provided on the lower surface of the rail 13. The first rail 13a and the second rail 13b are provided parallel to each other over the entire longitudinal area of ​​the rail 13 from the left end to the right end. As shown in Figure 9, a fixing screw 25 is fastened to a fixing plate 26 located within the first rail 13a, thereby fixing the first guide 20 so that it cannot slide relative to the rail 13. Loosening the fixing screw 25 from the fixing plate 26 allows the first guide 20 to slide along the rail 13. In this embodiment, the fixing screw 25 and the fixing plate 26 form a locking mechanism for fixing the first guide 20 so that it cannot move relative to the base 11.

[0031] 3, the first guide 20 is attached via the right end of the rail 13. The first guide 20 is attached by inserting the fixing plate 26 into the first rail 13a and positioning the rail 13 between the front wall portion 21b and the support column 21c. The first guide 20 can be removed from the right end of the first rail 13a by loosening the fixing screw 25.

[0032] Length scales 27, 28 are marked on the top and front surfaces of the rail 13, respectively. Both length scales 27, 28 are marked along the longitudinal direction (left-right direction) of the rail 13. Both length scales 27, 28 indicate, for example, the distance from the right end face of the connecting portion 12. Both length scales 27, 28 allow the distance of the first guide 20 from the connecting portion 12 to be confirmed. When the first guide 20 is slid to a position, for example, 50 mm from the right end face of the connecting portion 12, the 50 mm scale can be read from the left end face of the first guide 20. The values ​​on both length scales 27, 28 are marked in a direction that allows them to be read from the front.

[0033] As shown in Figure 1, the positions of the first guides 20 on the rails 13 of the two sets of parallel guides 10 are aligned and brought into contact with the end face We of the workpiece W. This positions the working side edge 1a of the long ruler 1 parallel to the end face We of the workpiece W. The position of the first guide 20 on the rails 13 is accurately determined by reading the length scale 27 (or length scale 28).

[0034] In the first case shown in FIG. 1, there is a sufficiently large distance L1 between the working-side edge 1a (filler line) of the ruler 1 and the end face We of the workpiece W. In contrast, in the second case shown in FIG. 4, there is a short distance L2 between the working-side edge 1a of the ruler 1 and the end face We of the workpiece W. In this case, the first guide 20 cannot be brought into contact with the end face We of the workpiece W. The second case includes not only the case shown in FIG. 4 where the end face We of the workpiece W is located below the ruler 1, but also the case where the end face We is located below the connecting portion 12. Both cases are the same in that the first guide 20 cannot be brought into contact with the end face We. In the second case, the ruler 1 is positioned at the second position by additionally using a second guide 30.

[0035] As shown in Figure 9, the front wall 21b and the two support pillars 21c protrude further downward from the underside of the rail 13. The second guide 30 is attached to the space between the front wall 21b and the support pillars 21c on the underside of the rail 13. This allows the second guide 30 to be attached along the underside of the rail 13. The second guide 30 can be attached to the first guide 20 while the first guide 20 remains attached to the rail 13. Therefore, there is no need to take the trouble of removing the first guide 20 from the rail 13 in order to attach the second guide 30.

[0036] 13 to 16 show the second guide 30 alone. The second guide 30 is called a short guide and has a strip-like shape that is long in the left-right direction. The front-to-rear width of the second guide 30 is set to a width dimension that allows it to be inserted between the front wall portion 21b and the support pillar 21c of the first guide 20. For this reason, as shown in FIGS. 6 and 9, the second guide 30 is attached so that it does not protrude from the first guide 20 in the front or rear.

[0037] As shown in Figures 13 to 16, an engagement retreat portion 30a is provided at the left end of the second guide 30. In this embodiment, a linear inclined surface is formed whose width increases continuously from the tip 30e to the right. This inclined surface serves as the engagement retreat portion 30a. The engagement retreat portion 30a is provided on the rear side, facing the engagement member 22 of the first guide 20.

[0038] An engagement recess 30b and a rail guide portion 30c are provided on the right end side of the second guide 30. The engagement recess 30b is recessed in a rectangular shape with a certain depth from the rear edge to the front. The engagement protrusion 22c of the engagement member 22 of the first guide enters the engagement recess 30b. In this way, the second guide 30 is attached to the first guide 20.

[0039] A rail guide portion 30c is provided on the upper surface of the engagement recess 30b. The rail guide portion 30c has a rectangular parallelepiped shape that is long in the left-right direction. A plurality of ribs 30f are provided inside the rail guide portion 30c to ensure geometric strength. As shown in Figures 9 and 17, when attaching the second guide 30 to the first guide 20, the rail guide portion 30c enters the second rail 13b of the rail 13.

[0040] 8 and 16, a plurality of ribs 30d intersecting in an X-shape are provided on the lower surface of the second guide 30. The surface rigidity of the second guide 30 is increased by the plurality of ribs 30d.

[0041] 17, the second guide 30 can be attached to and detached from the base 11 while the first guide 20 remains attached to the base 11. When attaching the second guide 30, first, the second guide 30 is moved leftward from the right end of the rail 13 along the underside, and the rail guide portion 30c is inserted into the right end of the second rail 13b. This brings the second guide 30 into a state where it is supported so as to be able to slide along the underside of the rail 13.

[0042] 18, when the second guide 30 is moved leftward along the underside of the rail 13, the engagement retraction portion 30a comes into contact with the engagement protrusion 22c of the engagement member 22 of the first guide 20. When the second guide 30 is moved leftward in this state, the engagement protrusion 22c is pressed by the engagement retraction portion 30a, and the engagement member 22 is displaced toward the retracted position against the torsion spring 24.

[0043] When the second guide 30 is further moved leftward with the engaging member 22 displaced to the retracted position, the engaging protrusion 22c of the engaging member 22 fits into the engaging recess 30b due to the biasing force of the torsion spring 24, as shown in Figure 8. The fitted state of the engaging protrusion 22c is maintained by the torsion spring 24. This connects the second guide 30 to the first guide 20. As a result, the second guide 30 is brought into a state in which it protrudes significantly to the left relative to the first guide 20.

[0044] With the second guide 30 connected to the first guide 20, moving the first guide 20 to the left brings the tip 30e of the second guide 30 into contact with the end face We of the workpiece W. This state is shown in Figure 8. In this state, the first guide 20 has not yet come into contact with the connecting portion 12. The contact position of the second guide 30 with the end face We is locked by tightening the fixing screw 25 to fix the position of the first guide 20. With the tip 30e of the second guide 30 in contact with the end face We of the workpiece W, the ruler 1 is positioned at a second position parallel to the end face We of the workpiece W (the position of the ruler 1 when the end face We of the workpiece W is located below the ruler 1 or the connecting portion 12).

[0045] By loosening the fixing screw 25 and sliding the first guide 20 to the right, the second guide 30 can be moved away from the end face We of the workpiece W.

[0046] When removing the second guide 30 from the base 11, the first guide 20 can remain attached to the rail 13; there is no need to take the trouble to remove it. To remove the second guide 30, the operating portion 22b of the engaging member 22 is pushed up with a fingertip against the torsion spring 24 to move the engaging member 22 to the retracted position. When the engaging member 22 is displaced to the retracted position, the engaging protrusion 22c retracts from the engaging recess 30b of the second guide 30. This separates the second guide 30 from the first guide 20, allowing it to slide independently. The second guide 30 is slid to the right along the rail 13, and the rail guide portion 30c is pulled out from the right end of the second rail 13b, removing the second guide 30 from the base 11. Once the second guide 30 is removed in this way, the long ruler 1 can again be positioned in the first position by the first guide 20.

[0047] According to the embodiment described above, the parallel guide 10 positions the ruler 1 along the surface of the workpiece W. The parallel guide 10 has a base 11 that is connected to the ruler 1 and extends from the ruler 1. The parallel guide 10 has a first guide 20 that is attached to the base 11 and abuts against the end face We of the workpiece W to determine the ruler 1 at a first position, and a second guide 30 that is attached to the first guide 20 and abuts against the end face We of the workpiece W to determine the ruler 1 at a second position. The second guide 30 is detachable from the base 11 independently of the first guide 20.

[0048] This allows the second guide 30 to be attached to the first guide 20 while the first guide 20 remains attached to the base 11, and therefore the second guide 30 can be attached to the base 11 indirectly via the first guide 20. Conversely, the second guide 30 can be removed from the base 11 while the first guide 20 remains attached. This improves the ease of attaching and removing the second guide 30 to and from the base 11.

[0049] According to the embodiment, the parallel guide 10 has a locking mechanism (fixing screw 25) that fixes the first guide 20 to the base 11. The second guide 30 is also fixed to the base 11 by the fixing screw 25. This simplifies the locking mechanism for fixing the second guide 30 to the base 11.

[0050] According to the embodiment, the base 11 is provided with rails 13 that support the first guide 20 and the second guide 30 so that they can move toward and away from the long ruler 1. This allows the first guide 20 and the second guide 30 to move smoothly relative to the long ruler 1.

[0051] According to the embodiment, the first guide 20 is provided with an engagement member 22 that engages with the second guide 30 that moves along the rail 13. This restricts the movement of the second guide 30 relative to the first guide 20.

[0052] According to the embodiment, the engaging member 22 is provided so as to be movable relative to the first guide 20 between an engaging position where it engages with the second guide 30 and a retracted position where it is retracted from the second guide 30. The second guide 30 is provided with an engagement retraction portion 30a that pushes the engaging member 22 when it moves along the rail 13, thereby moving the engaging member 22 from the engagement position to the retracted position. Therefore, the engagement retraction portion 30a of the second guide 30 retracts the engaging member 22 of the first guide 20 from the engagement position to the retracted position. As a result, the engagement member 22 can be smoothly engaged with the second guide 30 by the movement of the second guide 30.

[0053] According to the embodiment, the engagement retraction portion 30a is provided at the end of the second guide 30 and has an inclined surface inclined with respect to the movement direction along the rail 13. This allows the engagement member 22 to move smoothly to the retracted position.

[0054] According to the embodiment, the bases 11 are connected to two locations in the longitudinal direction of the ruler 1. By aligning the positions of the first guides 20 on the two bases 11 with each other, the ruler 1 is positioned parallel to the end face We of the workpiece W. This allows the ruler 1 to be quickly and accurately positioned at the first position shown in FIG. 1 relative to the end face We of the workpiece W.

[0055] According to the embodiment, the bases 11 are connected to two locations in the longitudinal direction of the long ruler 1. The positions of the second guides 30 on the two bases 11 are aligned with each other, and the tip 30e of the second guide 30 is brought into contact with the end face We of the workpiece W below the long ruler 1, thereby positioning the long ruler 1 parallel to the end face We of the workpiece W. This allows the long ruler 1 to be quickly and accurately positioned at the second position relative to the end face We of the workpiece W.

[0056] According to the embodiment, a length scale 28 indicating the position of the first guide 20 or the second guide 30 is provided on the side surface (front surface) of the base 11. This makes it easy to see the length scale 28 from the side (front), allowing the long ruler 1 to be positioned quickly and accurately.

[0057] According to the embodiment, a length scale 27 indicating the position of the first guide 20 or the second guide 30 is provided on the upper surface of the base 11. This makes it easy to see the length scale 27 from above, allowing the long ruler 1 to be positioned quickly and accurately.

[0058] According to the embodiment, the second guide 30 is provided below the base 11. When viewed from above, the second guide 30 is supported without protruding from the base 11. This allows the second guide 30 to be made compact, and therefore the parallel guide 10 to be made compact.

[0059] The above-described embodiment can be modified in various ways. For example, the engagement and withdrawal portion 30a of the second guide 30 may be a curved surface instead of a surface that is linearly inclined relative to the direction of movement along the rail 13.

[0060] Although the configuration in which the second guide 30 is attached to the first guide 20 has been exemplified, a configuration in which a separate support member is supported so as to be movable along the rail 13, and the second guide (short guide) is attached to this support member may also be used. Even in this case, the second guide can be attached to and detached from the base 11 while the first guide 20 remains attached to the base 11.

[0061] A length scale indicating the position of the first guide 20 may be displayed on the rear surface of the rail 13 .

[0062] An example has been given of using two sets of parallel guides 10 to position the long ruler 1 parallel to the end face We of the workpiece W, but by using a right-angle ruler to connect one set of parallel guides 10 perpendicular to the processing side edge 1a (non-processing side edge 1b) of the long ruler 1, the long ruler 1 can be positioned parallel to the end face We of the workpiece W using one set of parallel guides 10.

[0063] Although a long ruler 1 for guiding a portable circular saw has been shown as an example, the detachable structure of the second guide 30 relative to the parallel guide 10 shown as an example can also be applied to long rulers for guiding other portable processing machines such as jigsaws and routers.

[0064] The long ruler 1 of the embodiment is an example of a long ruler of the present disclosure. The workpiece W of the embodiment is an example of a workpiece of the present disclosure. The parallel guide 10 of the embodiment is an example of a positioning device for a long ruler of the present disclosure. The base 11 of the embodiment is an example of a base of the present disclosure. The end face We of the embodiment is an example of an end face of the present disclosure. The first guide 20 of the embodiment is an example of a first guide of the present disclosure. The second guide 30 of the embodiment is an example of a second guide of the present disclosure. [Explanation of symbols]

[0065] W…Work material We…end face 1...Long ruler 1a...Edge on the processing side, 1b...Edge on the non-processing side 2...First guide rail 3...Second guide rail 5...Portable circular saw 5a...cutting tool 10...Long ruler positioning device (parallel guide) 11...Foundation 12...Connection part 12a, 12b...Fixing screws, 12c...Fixing plate 13...Rail 13a...first rail, 13b...second rail 20...First Guide 21...Main body 21a...top plate portion, 21b...front wall portion, 21c...support column, 21d...insertion hole 22...Engagement member 22a...recessed portion, 22b...operating portion, 22c...engaging protrusion 23…Spindle 23a... shoulder screw, 23c... nut 24...Torsion spring 25...Fixing screw 26…Fixing plate 27...Length scale (top) 28...Length scale (front) L1: Distance between the edge 1a of the long ruler 1 on the processing side and the end face We of the workpiece W (first position) L2: Distance between the edge 1a of the long ruler 1 on the processing side and the end face We of the workpiece W (second position) 30...Second Guide (Short Guide) 30a... engagement retreat portion, 30b... engagement recess, 30c... rail guide portion, 30d... rib 30e...tip, 30f...rib

Claims

1. A long ruler positioning device that positions a long ruler along the surface of a workpiece, comprising: a base connected to the long ruler via a connecting portion and extending from the long ruler; a first guide attached to the base and abutting against an end surface of the workpiece to position the ruler at a first position; a second guide attached to the base or the first guide and abutting against the end surface of the workpiece when the long ruler is located at a second position where the first guide cannot abut against the end surface of the workpiece because the end surface of the workpiece is located below the long ruler or the connecting portion, and the second guide determines the long ruler at the second position; A positioning device for a long ruler, wherein the second guide is detachable from the base independently of the first guide.

2. 2. The long ruler positioning device according to claim 1, a locking mechanism for fixing the first guide to the base; The locking mechanism also fixes the second guide to the base.

3. 3. The long ruler positioning device according to claim 1, The base is provided with rails that support the first guide and the second guide so that they can move toward and away from the long ruler.

4. 4. The long ruler positioning device according to claim 3, The first guide is provided with an engaging member that engages with the second guide that moves along the rail.

5. 5. The long ruler positioning device according to claim 4, the engaging member is provided to be movable relative to the first guide between an engaging position where it engages with the second guide and a retracted position where it is retracted from the second guide, The second guide is provided with an engagement and retraction portion that pushes the engagement member when the second guide moves along the rail, thereby moving the engagement member from the engagement position to the retracted position.

6. 6. The long ruler positioning device according to claim 5, The engagement and withdrawal portion is provided at the end of the second guide and has an inclined surface or a curved surface that is inclined with respect to the direction of movement along the rail.

7. A long ruler positioning device according to any one of claims 1 to 6, The base is connected to two points in the longitudinal direction of the long ruler, and the positions of the first guides on the two bases are aligned with each other to position the long ruler parallel to the end face of the workpiece.

8. A long ruler positioning device according to any one of claims 1 to 7, The base is connected to two points in the longitudinal direction of the long ruler, and the positions of the second guides on the base at the two points are aligned with each other, and the tip of the second guide is abutted against the end face of the workpiece below the long ruler, thereby positioning the long ruler parallel to the end face of the workpiece.

9. A long ruler positioning device according to any one of claims 1 to 8, A positioning device for a long ruler, in which a length scale indicating the position of at least one of the first guide or the second guide is provided on the side of the base.

10. A long ruler positioning device according to any one of claims 1 to 9, A positioning device for a long ruler, wherein a length scale indicating the position of at least one of the first guide or the second guide is provided on the upper surface of the base.

11. A long ruler positioning device according to any one of claims 1 to 10, The second guide is provided below the base, and is supported so that it does not protrude from the base when viewed from above.

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