Length inspection jig

Abstract

To provide a length inspection jig that can be simplified and made low-cost. 【Solution means】The contact surface 22a of the first wall 20 and the opposing surface 31 of the second wall 30 face each other in parallel, and the maximum jig size SU from the contact surface 22a to the opposing surface 31 is set to the upper allowable size with respect to the length of the rod-shaped member 1. A stepped portion 32 projects vertically from the lower edge of the opposing surface 31 toward the contact surface 22a, and a support portion 60 is arranged on the side of the first wall 20 closer to the first wall 20 than the intermediate position between the first wall 20 and the second wall 30. The minimum jig size SL from the contact surface 22a to the edge of the stepped portion 32 on the side of the first wall 20 is set to the lower allowable size with respect to the length of the rod-shaped member 1. If the rod-shaped member 1 fits between the contact surface 22a and the opposing surface 31 and is supported by the stepped portion 32 and the support portion 60, it can be seen that the rod-shaped member 1 is within the allowable size.

Description

Technical Field

[0001] The present invention relates to a length inspection jig for inspecting the length of a rod-shaped member, and particularly to a length inspection jig that can be simplified and cost-reduced.

Background Art

[0002] Conventionally, in order to inspect whether the length of a rod-shaped member is within an allowable size (between an upper allowable size and a lower allowable size), a length inspection device may be used. For example, in the length inspection device described in Patent Document 1, one end of the rod-shaped member is pressed against a reference surface by an extrusion means, and the other end of the rod-shaped member is pressed by the extrusion means toward the reference surface, and the length of the rod-shaped member is measured by sandwiching the rod-shaped member in the axial direction, and it is determined whether the measurement result is within the allowable size.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the length inspection device of Patent Document 1 described above has a drive part for sandwiching and releasing each rod-shaped member one by one, and a measurement part (various sensors, etc.) for measuring the length when it is sandwiched, so there is a risk that the length inspection device will become complicated and costly.

[0005] The present invention has been made to solve the above-described problems, and an object thereof is to provide a length inspection jig that can be simplified and cost-reduced.

Means for Solving the Problems

[0006] To achieve this object, the length inspection jig of the present invention is for inspecting whether the length of a rod-shaped member is between an upper allowable size and a lower allowable size, and includes a base, a first wall and a second wall that rise upward from the base and face each other in opposite directions, and a support portion that is disposed closer to the first wall side than the intermediate position between the first wall and the second wall and can support the rod-shaped member from below. The first wall includes a contact surface formed perpendicular to the opposite direction facing the second wall. The second wall includes an opposing surface facing parallel to the contact surface, and a stepped portion that projects vertically from the lower edge of the opposing surface toward the contact surface and can support the rod-shaped member from below together with the support portion. The distance from the contact surface to the opposing surface is set to the upper allowable size, and the distance from the contact surface to the edge of the stepped portion on the first wall side is set to the lower allowable size.

Effect of the Invention

[0007] According to the length inspection jig described in claim 1, the contact surface of the first wall and the opposing surface of the second wall face each other in parallel, and the distance from the contact surface to the opposing surface (hereinafter referred to as the "maximum jig size") is set to the upper allowable size for the length of the rod-shaped member to be inspected. Thus, when one end of the rod-shaped member is placed against the contact surface and the rod-shaped member is supported by the support portion, if the rod-shaped member fits between the contact surface and the opposing surface, it can be easily determined that the length of the rod-shaped member is equal to or less than the upper allowable size. On the other hand, if the rod-shaped member does not fit between the contact surface and the opposing surface in this state, it can be easily determined that the length of the rod-shaped member is greater than the upper allowable size.

[0008] A step portion protrudes vertically from the lower edge of the opposing surface toward the contact surface, and a support portion is arranged on the first wall side rather than at the intermediate position between the first wall and the second wall. Therefore, one end side of the rod-shaped member accommodated between the contact surface and the opposing surface is supported from below by the support portion, and the other end side of the rod-shaped member is to be supported from below by the step portion. Since the distance from the contact surface to the edge on the first wall side of the step portion (hereinafter referred to as "minimum jig size") is set to the lower allowable size with respect to the length of the rod-shaped member to be inspected, if the rod-shaped member is supported by the step portion and the support portion, it can be easily understood that the length of the rod-shaped member is equal to or greater than the lower allowable size. On the other hand, when the other end side of the rod-shaped member does not rest on the step portion but falls to the base side, it can be easily understood that the length of the rod-shaped member is smaller than the lower allowable size. As described above, since the length inspection jig does not have a driving portion or a measuring portion (various sensors, etc.) for inspecting whether the length of the rod-shaped member is within the allowable size, the length inspection jig can be simplified and the cost can be reduced.

[0009] According to the length inspection jig described in claim 2, in addition to the effects achieved by the length inspection jig described in claim 1, the following effects are achieved. The first wall includes a fixed wall fixed to the base, and at least one or more adjustment plates that are replaceably stacked on the second wall side of the fixed wall. The contact surface is formed by the adjustment plate closest to the second wall. Thereby, by changing the thickness or number of the adjustment plates, the position of the contact surface in the opposing direction can be easily adjusted and changed. Therefore, while making the maximum jig size match the upper allowable size, the adjustment and change to make the minimum jig size match the lower allowable size can be easily performed. Therefore, it is possible to improve the inspection accuracy of the length inspection jig while suppressing complication and cost increase, and to improve the versatility.

[0010] According to the length inspection jig described in claim 3, in addition to the effects achieved by the length inspection jig described in claim 2, the following effects are achieved. Two or more adjustment plates are stacked on the fixed wall to form the first wall. Since the adjustment plate has a thick plate portion with a thickness of 5 mm or more and a thin plate portion with a thickness of 1 mm or less, the position of the contact surface can be roughly determined by the thick plate portion and finely adjusted by the thin plate portion. Here, when the contact surface is formed by the thin plate portion, if the inspection of applying the rod-shaped member to the contact surface of the thin plate portion is performed multiple times, the thin plate portion will gradually deform, and there is a risk that the maximum jig size and the minimum jig size will deviate from the upper and lower allowable sizes. On the contrary, since the contact surface is formed by the thick plate portion, the thick plate portion is difficult to deform even when the rod-shaped member hits it, and the maximum jig size and the minimum jig size can be made difficult to deviate from the upper and lower allowable sizes. Therefore, the inspection accuracy of the length inspection jig can be further improved.

[0011] According to the length inspection jig described in claim 4, in addition to the effects achieved by the length inspection jig described in claim 2 or 3, the following effects are achieved. The contact surface, the opposing surface, the step portion, and the support portion are formed to extend in the left-right direction so that a plurality of rod-shaped members are arranged in the left-right direction perpendicular to the opposing direction and the up-down direction between the first wall and the second wall. Thereby, the lengths of a plurality of rod-shaped members can be inspected simultaneously. Furthermore, since the adjustment plate is divided in the left-right direction, the thickness of the adjustment plate can be adjusted separately on both sides of the division position to adjust the position of the contact surface. Therefore, it is easy to match the maximum jig size and the minimum jig size with the upper and lower allowable sizes at a plurality of locations in the left-right direction, and the inspection accuracy can be improved even in the simultaneous inspection of a plurality of rod-shaped members.

[0012] According to the length inspection jig described in claim 5, in addition to the effects achieved by the length inspection jig described in claim 2 or 3, the following effects are achieved. Since the support portion is configured to be able to change its position in the opposing direction, the support portion can be brought closer to the contact surface whose position in the opposing direction can be changed. The closer the support portion is to the contact surface, the greater the downward rotational moment applied to the other end side of the rod-shaped member can be when one end side of the rod-shaped member is supported by the support portion. As a result, even if the length of the rod-shaped member is smaller than the lower allowable size, it can be easily avoided that the other end of the rod-shaped member is caught by the edge on the first wall side of the step portion or the like due to frictional force or the like and does not fall to the base side. Therefore, the inspection accuracy of the length inspection jig can be further improved.

[0013] According to the length inspection jig described in claim 6, in addition to the effects achieved by the length inspection jig described in any one of claims 1 to 3, the following effects are achieved. The second wall includes an inclined portion that rises and inclines from the upper edge of the opposing surface toward the side opposite to the first wall. As a result, from the state where one end of the rod-shaped member is placed on the contact surface and the rod-shaped member is supported by the support portion, the other end of the rod-shaped member can be guided along the inclined portion to the opposing surface, making it easier to set the rod-shaped member on the length inspection jig.

[0014] Furthermore, the width from the lower edge to the upper edge of the opposing surface is equal to or less than the diameter of the rod-shaped member. As a result, even if it is equal to or less than the upper allowable size, it can be easily avoided that the rod-shaped member is caught by the upper edge of the opposing surface due to the inclination of the rod-shaped member and the rod-shaped member cannot fit between the contact surface and the opposing surface. Therefore, the inspection accuracy of the length inspection jig can be further improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying out the Invention

[0016] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a top view of a length inspection jig 10 in one embodiment of the present invention. FIG. 2 is a bottom view of the length inspection jig 10. FIG. 3 is a cross-sectional view of the length inspection jig 10 taken along line III-III of FIG. 1. Arrows U, D, L, R, F, and B in each drawing indicate the upper, lower, left, right, front, and rear directions of the length inspection jig 10, respectively. Note that this vertical direction (arrow U-D direction) does not necessarily coincide with the vertical direction.

[0017] As shown in FIG. 1, the length inspection jig 10 is a jig for collectively inspecting whether the length from one end 3 to the other end 4 in the axial direction of a plurality of rod-shaped members 1 and 2 is between the upper allowable size and the lower allowable size. The difference between the upper allowable size and the lower allowable size is the tolerance (size tolerance). In this embodiment, the upper allowable size is the reference dimension +0.1 mm, the lower allowable size is the reference dimension -0.1 mm, and the tolerance is 0.2 mm.

[0018] The length (reference dimension) of the rod-shaped member 1 is shorter than the length (reference dimension) of the rod-shaped member 2. Except for this length, the rod-shaped members 1 and 2 are configured identically to each other. The rod-shaped members 1 and 2 are cylindrical rod-shaped members and have a constant diameter R over substantially the entire length except in the vicinity of one end 3 and the other end 4. In the vicinity of this one end 3 and the other end 4, processing has been performed to reduce the diameter.

[0019] The length inspection jig 10 mainly includes a base 11 that constitutes the bottom, a first wall 20 that constitutes the front wall, a second wall 30 that constitutes the rear wall, a pair of side walls 40 provided on the left and right sides respectively, an intermediate wall 50 provided at the center in the left - right direction (arrow L - R direction), and a support portion 60 that supports the rod - shaped members 1 and 2. The space surrounded by these walls is open upward.

[0020] As shown in FIGS. 1 and 2, the base 11 is a rectangular steel plate with the vertical direction as the plate - thickness direction. The thickness of the base 11 is larger than the diameter R of the rod - shaped member 2. On the lower surface of the base 11, four square - bar - shaped reinforcing bars 12 extending in the front - rear direction (arrow F - B direction) are arranged in parallel in the left - right direction. The reinforcing bars 12 are fixed to the lower surface of the base 11 at a plurality of locations in the front - rear direction by screws 14. Note that the heads of the screws 14 are accommodated in recesses provided on the upper surface of the base 11. Also, this head and the recess are hidden by a rubber plate 13 attached to the upper surface of the base 11.

[0021] As shown in FIG. 3, in this embodiment, by placing the base 11 including the reinforcing bars 12 on the inclined table 6, the length inspection jig 10 inclines forward. Specifically, when the inclined table 6 is placed on a horizontal plane and the length inspection jig 10 is placed thereon, the inclined table 6 is configured such that the vertical direction of the length inspection jig 10 inclines 30 degrees with respect to the vertical direction, and similarly, the front - rear direction of the length inspection jig 10 inclines 30 degrees with respect to the horizontal direction. This inclination angle may be changed as appropriate.

[0022] Note that the left - right direction of the length inspection jig 10 coincides with the horizontal direction. Also, the inclined table 6 is provided with a regulating portion 6a that abuts against the front edge of the base 11. This regulating portion 6a prevents the length inspection jig 10 from sliding forward off the inclined table 6.

[0023] As shown in FIGS. 1 and 3, the first wall 20 is a portion where one end 3 of the rod-shaped members 1 and 2 hits, and rises upward from the front edge of the base 11. The first wall 20 includes a fixed wall 21 fixed over the entire length of the front edge of the base 11, and one or more adjustment plates that are replaceably stacked on the rear surface side (the second wall 30 side) of the fixed wall 21. The fixed wall 21 is a rectangular steel plate perpendicular to the base 11 and has a thickness (front-rear dimension) larger than the thickness of the base 11.

[0024] The adjustment plates include thick plate portions 22, 23, 24 made of steel with a thickness T1, T2, T3 of 5 mm or more, and a thin plate portion 25 made of steel with a thickness T4 of 1 mm or less (for example, a commercially available 0.01 mm shim plate). The thick plate portions 22 to 24 of the present embodiment are made of hardened steel and are harder and more wear-resistant than the fixed wall 21, the thin plate portion 25, and the second wall 30. The thick plate portions 22 to 24 are placed on the base 11. Handles 26 for an operator to grip when replacing the thick plate portions 22 to 24 are respectively attached to the upper surfaces (upper edges) of the thick plate portions 22 to 24.

[0025] In the present embodiment, approximately 1 / 3 of the thickness T1 of the thick plate portion 22 is the thickness T2 of the thick plate portion 23, and approximately 1 / 2 of the thickness T2 of the thick plate portion 23 is the thickness T3 of the thick plate portion 24. The heights (vertical dimensions) of the thick plate portions 22 to 24 are substantially the same as the height of the fixed wall 21. The widths (left-right dimensions) of the thick plate portions 22 to 24 are substantially the same as the left-right interval between the side wall 40 and the intermediate wall 50.

[0026] Between the left side wall 40 and the intermediate wall 50, the thin plate portion 25 and the thick plate portion 22 are sequentially stacked on the fixed wall 21 from the front to the rear. On the left side, a contact surface 22a perpendicular to the front-rear direction is formed by the rear surface of the thick plate portion 22, which is the rearmost adjustment plate.

[0027] Between the right side wall 40 and the intermediate wall 50, the thick plate portion 23 and the thick plate portion 24 are sequentially stacked on the fixed wall 21 from the front to the rear. Note that the thin plate portion 25 may be sandwiched between the thick plate portion 23 and the fixed wall 21 or between the thick plate portions 23 and 24. On the right side, a contact surface 24a perpendicular to the front-rear direction is formed by the rear surface of the thick plate portion 24, which is the rearmost adjustment plate.

[0028] These abutting surfaces 22a and 24a face the second wall 30. Due to the difference in thicknesses T1 to T3, the abutting surface 24a is positioned forward of the abutting surface 22a. For example, instead of the thick plate portions 23 and 24, a thick plate portion 22 may also be provided between the right side wall 40 and the intermediate wall 50, and the front-rear positions of the abutting surfaces 22a and 24a may be made the same.

[0029] The second wall 30 is a portion where the other ends 4 of the rod-shaped members 1 and 2 abut, and is formed of a rectangular steel plate having substantially the same thickness (front-rear dimension) as the thickness of the fixed wall 21. The second wall 30 is fixed to the base 11 so as to rise vertically upward from the entire length of the rear edge portion of the base 11, and faces the first wall 20 in the front-rear direction (opposing direction). The height (vertical dimension) of the second wall 30 is substantially the same as the height of the first wall 20 (such as the fixed wall 21).

[0030] The front surface on the first wall 20 side of the second wall 30 includes an opposing surface 31 that faces parallel to the abutting surfaces 22a and 24a of the first wall 20, a stepped portion 32 that projects vertically forward from the lower edge of the opposing surface 31, and a stepped lower surface 33 that extends vertically downward from the front edge of the stepped portion 32. The width L1 (front-rear dimension) from the front edge to the rear edge of the stepped portion 32 is set to be the same as the tolerance of the rod-shaped members 1 and 2 to be inspected. The width L2 (vertical dimension) from the lower edge to the upper edge of the opposing surface 31 is slightly smaller than the diameter R of the rod-shaped members 1 and 2.

[0031] The corner between the front surface and the upper surface of the second wall 30 is chamfered to form an inclined portion 34 that rises and inclines rearward from the upper edge of the opposing surface 31. The opposing surface 31, the stepped portion 32, the stepped lower surface 33, and the inclined portion 34 are all configured identically over substantially the entire length of the second wall 30 in the left-right direction.

[0032] The pair of side walls 40 are walls for preventing the bar-shaped members 1 and 2 arranged in the left-right direction between the first wall 20 and the second wall 30 from falling off to the outside. The pair of side walls 40 are each formed of a rectangular aluminum alloy plate having a thickness (left-right dimension) substantially the same as that of the fixed wall 21. The pair of side walls 40 are fixed to the base 11 so as to rise vertically upward from both left and right edges of the base 11 and face each other in the left-right direction. The height (up-down dimension) of the side wall 40 is substantially the same as the height of the second wall 30 and the like.

[0033] The side wall 40 is divided in the front-rear direction so as to include a first side wall portion 41 extending rearward from the fixed wall 21 and a second side wall portion 42 extending forward from the second wall 30. By inserting a hand through this divided portion, it becomes easier to insert the bar-shaped members 1 and 2 between the first wall 20 and the second wall 30 even in the vicinity of the side wall 40, and it also becomes easier to take out the bar-shaped members 1 and 2 from between them.

[0034] On the inner surfaces in the left-right direction of the pair of first side wall portions 41, two mounting grooves 43 are formed each. The two mounting grooves 43 are arranged in parallel with each other, separated in the front-rear direction. The mounting grooves 43 are formed over the entire up-down direction of the first side wall portion 41 and open to the upper surface of the first side wall portion 41.

[0035] The intermediate wall 50 is a wall for dividing the space between the pair of side walls 40 where the bar-shaped members 1 and 2 are arranged in the left-right direction, and is configured substantially the same as the side wall 40. The intermediate wall 50 is formed of a rectangular aluminum alloy plate having a thickness (left-right dimension) substantially the same as that of the fixed wall 21. The intermediate wall 50 is fixed to the base 11 so as to rise vertically upward from the center in the left-right direction of the base 11. The height (up-down dimension) of the intermediate wall 50 is substantially the same as the height of the second wall 30 and the like.

[0036] The intermediate wall 50 is divided in the front-rear direction so as to include a first intermediate wall portion 51 extending rearward from the fixed wall 21 and a second intermediate wall portion 52 extending forward from the second wall 30. By inserting a hand through this divided portion, it becomes easier to insert the rod-shaped members 1 and 2 between the first wall 20 and the second wall 30 near the intermediate wall 50, or to take out the rod-shaped members 1 and 2 from between them.

[0037] On both the left and right surfaces of the first intermediate wall portion 51, two mounting grooves 53 are formed. The two mounting grooves 53 are arranged in parallel, separated from each other in the front-rear direction, and facing the two mounting grooves 43 of the first side wall portion 41.

[0038] The support portion 60 is a part for supporting the rod-shaped members 1 and 2 from below. The support portion 60 is formed of a synthetic resin plate material, and the upper end portion is formed in a semi-cylindrical shape over the entire length in the left-right direction.

[0039] The support portion 60 is arranged between the first wall 20 and the second wall 30 by being inserted into the mounting grooves 43 and 53 from above. To facilitate this insertion, the upper edges of the mounting grooves 43 and 53 are chamfered. On the left side of the intermediate wall 50, a part of the front mounting grooves 43 and 53 is blocked by the thick plate portion 22, so the support portion 60 is inserted into the rear mounting grooves 43 and 53. On the right side of the intermediate wall 50, the support portion 60 is inserted into the front mounting groove 43 and 53 close to the thick plate portion 24.

[0040] With reference to FIGS. 1 to 3, the assembly method of the length inspection jig 10 will be described. The assembly order shown below may be changed as appropriate. First, four reinforcing rods 12 are fixed to the base 11 with screws 14. Next, the rubber plate 13 is attached to the upper surface of the base 11.

[0041] Insert the knock pins 15 into the plurality of through holes provided along the front edge of the base 11, respectively, and project the knock pins 15 from the upper surface of the base 11. With the rear surface of the fixed wall 21 abutted against the knock pins 15 and in a positioned state, fix the fixed wall 21 to the base 11 with screws 18. Similarly, insert the knock pins 16 into the plurality of through holes provided along the rear edge of the base 11, respectively, and project the knock pins 16 from the upper surface of the base 11. With the stepped lower surface 33 of the second wall 30 abutted against the knock pins 16 and in a positioned state, fix the second wall 30 to the base 11 with screws 18.

[0042] Next, fix the first side wall portion 41, the second side wall portion 42, the first intermediate wall portion 51, and the second intermediate wall portion 52 to the base 11 with screws 18, respectively. Then, insert one or more adjustment plates (thick plate portions 22 to 24 and thin plate portion 25) between the first side wall portion 41 and the first intermediate wall portion 51, stack them on the fixed wall 21, and form the contact surfaces 22a, 24a. Note that recesses 27 for avoiding interference with the knock pins 16 are formed in the thick plate portions 22 to 24. The thin plate portion 25 is sandwiched between the thick plate portions 22 to 24 and the fixed wall 21 above the knock pins 16.

[0043] The thicknesses T1 to T4 and the number of the adjustment plates are determined so that the distance SU from the contact surfaces 22a, 24a to the opposing surface 31 (hereinafter referred to as "fixture maximum size SU") is set to the upper allowable size with respect to the lengths of the bar-shaped members 1, 2 to be inspected. Since the width L1 of the stepped portion 32 is the same as the tolerance, the distance SL from the contact surfaces 22a, 24a to the front edge of the stepped portion 32 (hereinafter referred to as "fixture minimum size SL") is set to the lower allowable size with respect to the lengths of the bar-shaped members 1, 2. In the present embodiment, the fixture maximum size SU and the fixture minimum size SL are different on the right side and the left side of the intermediate wall 50, and the left side is smaller. Finally, the assembly of the length inspection fixture 10 is completed by inserting the support portions 60 into the mounting grooves 43, 53 closest to the contact surfaces 22a, 24a.

[0044] Next, with reference to FIGS. 3 and 4, a method for inspecting the length of the rod-shaped member 1 by the length inspection jig 10 will be described. FIG. 4(a) is a cross-sectional view of the length inspection jig 10 when the rod-shaped member 1 is larger than the upper allowable size. FIG. 4(b) is a cross-sectional view of the length inspection jig 10 when the rod-shaped member 1 is smaller than the lower allowable size. In contrast, FIG. 3 shows a case where the length of the rod-shaped member 1 is less than or equal to the upper allowable size and greater than or equal to the lower allowable size.

[0045] First, the length inspection jig 10 assembled as described above is placed on the inclined table 6 and lowered and inclined forward. Next, an operator standing in front of the length inspection jig 10 holds a plurality of rod-shaped members 1, places one end 3 of the rod-shaped member 1 against the rubber plate 13, and aligns one end 3 of the plurality of rod-shaped members 1. By providing the rubber plate 13 for aligning one end 3 in this way, it is possible to prevent the operator from hitting one end 3 forcefully against a metal part (for example, the upper surface of the base 11) and damaging one end 3.

[0046] After the operator aligns one end 3, the operator lowers the rod-shaped member 1 until one end 3 abuts against the contact surface 22a and the rod-shaped member 1 is supported by the support portion 60 (hereinafter referred to as the "one-end supported state"). At this time, it is preferable to lower the rod-shaped member 1 so that substantially the entire surface of one end 3 is in surface contact with the contact surface 22a and the rod-shaped member 1 is parallel to the front-rear direction (perpendicular to the contact surface 22a).

[0047] Since the length inspection jig 10 is lowered and inclined forward by the inclined table 6, it is easy to maintain the state where the rod-shaped member 1 abuts against the contact surface 22a by gravity. Therefore, the workability when lowering the rod-shaped member 1 while pressing it against the contact surface 22a can be improved.

[0048] As shown in Fig. 4(a), in the one-end supported state, the rod-shaped member 1 may catch on the upper edge of the opposing surface 31 and not fit between the contact surface 22a and the opposing surface 31. Since the maximum jig size SU from the contact surface 22a to the opposing surface 31 is set to the allowable size above the rod-shaped member 1, and it does not fit between them, it can be easily understood that the length of the rod-shaped member 1 is greater than the allowable size above. On the contrary, as shown in Fig. 3, if the rod-shaped member 1 fits between the contact surface 22a and the opposing surface 31 in the one-end supported state, it can be easily understood that the length of the rod-shaped member 1 is equal to or less than the allowable size above.

[0049] The second wall 30 has a stepped portion 32, and the support portion 60 is arranged closer to the first wall 20 than the intermediate position between the first wall 20 (contact surface 22a) and the second wall 30. Therefore, one end 3 side of the rod-shaped member 1 that fits between the contact surface 22a and the opposing surface 31 is supported from below by the support portion 60, and the other end 4 side of the rod-shaped member 1 is to be supported from below by the stepped portion 32. Since the minimum jig size SL from the contact surface 22a to the leading edge of the stepped portion 32 is set to the allowable size below the rod-shaped member 1, if the rod-shaped member 1 is supported by the stepped portion 32 and the support portion 60, it can be easily understood that the length of the rod-shaped member 1 is equal to or greater than the allowable size below.

[0050] On the other hand, as shown in Fig. 4(b), when the other end 4 side of the rod-shaped member 1 does not rest on the stepped portion 32 and falls toward the base 11 side, it can be easily understood that the length of the rod-shaped member 1 is smaller than the allowable size below. As described above, since the length inspection jig 10 does not have a driving portion or a measuring portion (various sensors, etc.) for inspecting whether the length of the rod-shaped member 1 is within the allowable size (equal to or less than the allowable size above and equal to or greater than the allowable size below), the length inspection jig 10 can be simplified and cost-reduced compared to the case where it has them.

[0051] Incidentally, these inspection methods are the same for the rod-shaped member 2 as well. When the rod-shaped member 2 is in a state of being supported at one end and fits between the contact surface 24a and the opposing surface 31, and the rod-shaped member 2 is supported by the support portion 60 and the stepped portion 32, it can be easily determined that the length of the rod-shaped member 2 is within the allowable size. On the other hand, if the rod-shaped member 2 does not fit between them, or if the other end 4 side of the rod-shaped member 2 drops toward the base 11 side, it can be easily determined that the length of the rod-shaped member 2 is outside the allowable size.

[0052] The contact surfaces 22a, 24a, the opposing surface 31, the stepped portion 32, and the support portion 60 are formed to extend in the left-right direction so that a plurality of rod-shaped members 1, 2 are arranged in the left-right direction between the first wall 20 and the second wall 30. Thereby, the lengths of the plurality of rod-shaped members 1, 2 can be inspected simultaneously. Further, by arranging the plurality of rod-shaped members 1, 2, the difference between the rod-shaped members 1, 2 supported by the support portion 60 and the stepped portion 32 and the rod-shaped members 1, 2 not so supported can be easily distinguished by the operator, and the length inspection work can be facilitated.

[0053] Also, on each of both sides of the intermediate wall 50, it is configured such that 25 rod-shaped members 1, 2 can fit between the side wall 40 and the intermediate wall 50. Thereby, simultaneously with the inspection of the length of the rod-shaped members 1, 2, the number of the rod-shaped members 1, 2 can be easily confirmed. In addition, the appearance of the rod-shaped members 1, 2 can be inspected simultaneously.

[0054] When the rod-shaped members 1, 2 that fit between the contact surfaces 22a, 24a and the opposing surface 31 are supported by the stepped portion 32 and the support portion 60, the heights of the stepped portion 32 and the support portion 60 are set so that the rod-shaped members 1, 2 are parallel to the front-rear direction. Thereby, it can be easily avoided that, due to the rod-shaped members 1, 2 tilting with respect to the front-rear direction, the rod-shaped members 1, 2 do not rest on the stepped portion 32 and drop toward the base 11 side even though they are above the lower allowable size. Therefore, the inspection accuracy of the length inspection jig 10 can be improved.

[0055] Since the inclined portion 34 is continuous with the upper edge of the opposing surface 31, the other end 4 of the rod-shaped members 1 and 2 can be guided along the inclined portion 34 to the opposing surface 31 from the one-end supported state, making it easier to set the rod-shaped members 1 and 2 in the length inspection jig 10. That is, when lowering the rod-shaped members 1 and 2, even if the rod-shaped members 1 and 2 are slightly inclined in the front-rear direction, as long as the length of the rod-shaped members 1 and 2 is below the upper allowable size, the rod-shaped members 1 and 2 can be accommodated between the contact surfaces 22a and 24a and the opposing surface 31. Therefore, variations in the inspection accuracy of the length inspection jig 10 according to the skills of the operator can be suppressed.

[0056] The larger the width L2 of the opposing surface 31 is, the easier it is for the rod-shaped members 1 and 2 to get caught on the upper edge of the opposing surface 31 even if the inclination of the rod-shaped members 1 and 2 in the front-rear direction is small. In contrast, in this embodiment, the width L2 of the opposing surface 31 is less than or equal to the diameter R of the rod-shaped members 1 and 2. As a result, it is easy to avoid the situation where, even though it is below the upper allowable size, the rod-shaped members 1 and 2 get caught on the upper edge of the opposing surface 31 due to the inclination of the rod-shaped members 1 and 2 and the rod-shaped members 1 and 2 cannot be accommodated between the contact surfaces 22a, 24a and the opposing surface 31. Therefore, the inspection accuracy of the length inspection jig 10 can be improved.

[0057] In the length inspection jig 10, since the maximum jig size SU and the minimum jig size SL between the first wall 20 and the second wall 30 are set to the upper and lower allowable sizes of the rod-shaped members 1 and 2, the degree of their deviation is determined according to the positional accuracy of the first wall 20 and the second wall 30 with respect to the base 11. In this embodiment, using the knock pins 15 and 16, with the fixed wall 21 of the first wall 20 and the second wall 30 positioned with respect to the base 11, they are fixed with the screws 18. Therefore, compared with the case of fixing the fixed wall 21 and the second wall 30 to the base 11 only with the screws 18, by using the knock pins 15 and 16, the positional accuracy of the first wall 20 and the second wall 30 with respect to the base 11 can be improved. As a result, the maximum jig size SU and the minimum jig size SL can be made less likely to deviate from the upper and lower allowable sizes, and the inspection accuracy of the length inspection jig 10 can be improved.

[0058] In addition, the maximum jig size SU, the minimum jig size SL, and the upper and lower allowable sizes may shift due to deformation of the base 11, the first wall 20, and the second wall 30. In this embodiment, since the base 11, the first wall 20, and the second wall 30 are made of steel, they have relatively high rigidity and a relatively low coefficient of thermal expansion. As a result, it is difficult for the maximum jig size SU and the minimum jig size SL to shift from the upper and lower allowable sizes, and the inspection accuracy of the length inspection jig 10 can be improved.

[0059] Since four steel reinforcing bars 12 are fixed to the lower surface of the base 11, the rigidity of the base 11 is further increased. Therefore, it is more difficult for the maximum jig size SU and the minimum jig size SL to shift from the upper and lower allowable sizes, and the inspection accuracy of the length inspection jig 10 can be further improved. In addition, compared with the case where the base 11 is thickened and rigidified without providing the reinforcing bars 12, rigidifying the base 11 with the reinforcing bars 12 can reduce the weight of the length inspection jig 10.

[0060] The side wall 40 and the intermediate wall 50, which contribute little to these displacements, are made of an aluminum alloy. They are lighter while having lower rigidity and a higher coefficient of thermal expansion than steel. Therefore, compared with the case where even the side wall 40 and the intermediate wall 50 are made of steel, making them of an aluminum alloy can reduce the weight of the length inspection jig 10.

[0061] As described above, the maximum jig size SU and the minimum jig size SL corresponding to the positions of the contact surfaces 22a and 24a are determined by the thicknesses T1 to T4 and the number of the adjustment plates (the thick plate portions 22 to 24 and the thin plate portion 25). In other words, by changing these thicknesses T1 to T4 and the number, the positions of the contact surfaces 22a and 24a in the front-rear direction can be easily adjusted and changed. Therefore, it is easy to perform adjustment and change so that the minimum jig size SL matches the lower allowable size while making the maximum jig size SU match the upper allowable size. Therefore, the inspection accuracy of the length inspection jig 10 can be improved while suppressing complication and cost increase, and the versatility can be improved.

[0062] Furthermore, since the adjustment plate has thick plate portions 22 to 24 and a thin plate portion 25, the positions of the contact surfaces 22a and 24a can be roughly determined by the thick plate portions 22 to 24 and finely adjusted by the thin plate portion 25. In particular, the thickness T4 of the thin plate portion 25 is preferably 0.05 mm (1 / 4 of the tolerance) or less, which is smaller than the tolerance of the lengths of the rod-shaped members 1 and 2, and more preferably 0.02 mm (1 / 10 of the tolerance) or less. The smaller the thickness T4 of the thin plate portion 25, the finer the positions of the contact surfaces 22a and 24a can be adjusted. Note that a plurality of thin plate portions 25 having different thicknesses T4 may be stacked to adjust the positions of the contact surfaces 22a and 24a.

[0063] Here, consider the case where the contact surfaces 22a and 24a are formed by the thin plate portion 25. Since the thin thin plate portion 25 has low rigidity, if the inspection of applying the rod-shaped members 1 and 2 to the contact surfaces 22a and 24a of the thin plate portion 25 is performed a plurality of times, the thin plate portion 25 will gradually deform, and there is a possibility that the maximum jig size SU and the minimum jig size SL will gradually deviate from the upper and lower allowable sizes.

[0064] On the other hand, in the present embodiment, the contact surfaces 22a and 24a are formed by the thick plate portions 22 and 24. Since the thick plate portions 22 and 24 made of thick solid materials are highly rigid, the thick plate portions 22 and 24 are difficult to deform even when the rod-shaped members 1 and 2 hit the contact surfaces 22a and 24a. In particular, since the thick plate portions 22 and 24 are made of quenched steel and have excellent wear resistance, wear of the contact surfaces 22a and 24a due to contact with the rod-shaped members 1 and 2 can be suppressed. As a result, even if a plurality of inspections are performed, the maximum jig size SU and the minimum jig size SL can be made difficult to deviate from the upper and lower allowable sizes, and the inspection accuracy of the length inspection jig 10 can be improved.

[0065] The thin plate portion 25 is not limited to being sandwiched across substantially the entire left - right direction between the thick plate portions 22, 23 and the fixed wall 21, and may be sandwiched in a part of the left - right direction. Thereby, even when the jig maximum size SU and the jig minimum size SL differ at a plurality of positions in the left - right direction due to manufacturing errors, assembly errors, etc. of the length inspection jig 10, they can be easily made to match the upper and lower allowable sizes by partially sandwiching the thin plate portion 25. Therefore, the inspection accuracy can be improved even in the simultaneous inspection of a plurality of rod - shaped members 1, 2 arranged in the left - right direction.

[0066] Since the support portion 60 is configured to be able to change its position in the front - rear direction, the support portion 60 can be brought closer to the contact surfaces 22a, 24a that can also change their positions in the front - rear direction. The closer they are, the larger the downward rotational moment applied to the other end 4 side of the rod - shaped members 1, 2 can be when the one - end 3 side of the rod - shaped members 1, 2 is supported by the support portion 60. Thereby, even though the length of the rod - shaped members 1, 2 is smaller than the lower allowable size, it can be easily avoided that the other end 4 of the rod - shaped members 1, 2 is caught on the front edge of the step portion 32 or the like and does not fall toward the base 11 side due to frictional force or the like. Thus, the inspection accuracy of the length inspection jig 10 can be improved.

[0067] Since the adjustment plates (thick plate portions 22 - 24 and thin plate portion 25) are divided in the left - right direction with the intermediate wall 50 as a boundary, the thicknesses T1 - T4 and the number of the adjustment plates can be adjusted separately on both sides of the intermediate wall 50 to adjust the positions of the contact surfaces 22a, 24a. Specifically, in this embodiment, the jig maximum size SU and the jig minimum size SL are made different on both sides of the intermediate wall 50. Therefore, the lengths of two types of rod - shaped members 1, 2 can be inspected with one length inspection jig 10.

[0068] Incidentally, the maximum jig size SU and the minimum jig size SL may be made the same on both sides of the intermediate wall 50. By making them, for example, the sizes suitable for the rod-shaped member 1, more rod-shaped members 1 can be inspected at once with one length inspection jig 10. Further, in this case, similar to the clamping of the partial thin plate portion 25 described above, by changing the thickness T4 or the number of the thin plate portions 25 clamped on both sides of the intermediate wall 50, it is possible to easily make the maximum jig size SU and the minimum jig size SL on both sides thereof coincide with the upper and lower allowable sizes. Therefore, the inspection accuracy can be improved even in the simultaneous inspection of a plurality of rod-shaped members 1 arranged in the left-right direction.

[0069] As described above, the present invention has been described based on the embodiments. However, it can be easily inferred that the present invention is not limited to the above embodiments at all, and various improvements and modifications are possible without departing from the gist of the present invention. The shape, material, number, etc. of each part of the length inspection jig 10 may be appropriately changed. Also, the numerical values exemplified in the above embodiments may be appropriately changed.

[0070] In the above embodiment, the case where each part (the base 11, the fixed wall 21, the second wall 30, etc.) of the length inspection jig 10 is fixed with the screws 14 and 18 has been described. However, it is not necessarily limited to this, and they may be integrally formed or joined by welding or the like. Also, the first wall 20 is not limited to the case where it is formed by the fixed wall 21 and the adjustment plates (the thick plate portions 22 to 24 and the thin plate portion 25), and the first wall 20 may be formed only by the fixed wall 21. The thin plate portion 25 may be omitted, and the first wall 20 may be formed by the fixed wall 21 and the thick plate portions 22 to 24.

[0071] In the above embodiment, the case where the support portion 60 is inserted into one of the two mounting grooves 43 and 53 separated in the front-rear direction has been described. However, it is not necessarily limited to this, and the mounting grooves 43 and 53 may be provided at three or more positions in the front-rear direction. Also, for example, the mounting grooves 43 and 53 may be omitted, and the support portion 60 may be fixed to the base 11 so as not to be movable. The position of the support portion 60 in the front-rear direction may be configured to be continuously changeable. A portion protruding from the contact surfaces 22a and 24a, such as the stepped portion 32, may be provided, and that portion may be used as the support portion 60.

[0072] In the above embodiment, the case where the length inspection jig 10 is tilted by placing the base 11 on the inclined table 6 has been described, but it is not necessarily limited to this. For example, the base 11 itself may be provided with the function of the inclined table 6 (integrating the base 11 and the inclined table 6) to tilt the length inspection jig 10.

[0073] In the above embodiment, the case where the space between the pair of side walls 40 is divided into two in the left - right direction by the intermediate wall 50 has been described, but it is not necessarily limited to this. For example, the space between the pair of side walls 40 may be divided into three or more in the left - right direction by two or more intermediate walls 50. Also, the intermediate wall 50 may be omitted, and the adjustment plate may be divided into two or more in the left - right direction. The side wall 40 may be omitted.

Explanation of Reference Numerals

[0074] 1, 2 Rod - shaped members 3 One end 10 Length inspection jig 11 Base 20 First wall 21 Fixed wall 22, 23, 24 Thick plate parts (a kind of adjustment plate) 22a, 24a Contact surface 25 Thin plate part (a kind of adjustment plate) 30 Second wall 31 Opposing surface 32 Step part 34 Inclined part 60 Support part

Claims

1. A length inspection tool for inspecting whether the length of a rod-shaped member is between an upper allowable size and a lower allowable size, With the base, a first wall and a second wall each rising upward from the base and facing each other in an opposing direction; a support portion that is disposed on the first wall side relative to an intermediate position between the first wall and the second wall and is capable of supporting the rod-shaped member from below, The first wall includes a contact surface formed perpendicular to the opposing direction and facing the second wall, The second wall is an opposing surface facing the abutment surface in parallel; a step portion that projects vertically from a lower edge of the opposing surface toward the contact surface and is capable of supporting the rod-shaped member from below together with the support portion, A length inspection jig characterized in that the distance from the abutment surface to the opposing surface is set to the upper allowable size, and the distance from the abutment surface to the edge of the first wall side of the step portion is set to the lower allowable size.

2. The first wall is A fixed wall fixed to the base; one or more adjustment plates replaceably stacked on the second wall side of the fixed wall; 2. The length inspection jig according to claim 1, wherein the contact surface is formed by the adjustment plate that is closest to the second wall.

3. The first wall is formed by stacking two or more of the adjustment plates on the fixed wall, The adjustment plate has a thick plate portion having a thickness of 5 mm or more and a thin plate portion having a thickness of 1 mm or less, 3. The length inspection jig according to claim 2, wherein the contact surface is formed by the thick plate portion.

4. the contact surface, the opposing surface, the step portion and the support portion are formed to extend in the left-right direction so that the rod-shaped members are arranged in a left-right direction perpendicular to the opposing direction and the up-down direction between the first wall and the second wall, 4. The length inspection jig according to claim 2, wherein the adjustment plate is divided in the left and right direction.

5. 4. The length inspection jig according to claim 2, wherein the support portions are configured so that their positions in the opposing direction can be changed.

6. the second wall includes an inclined portion that is inclined upward from an upper edge of the opposing surface toward a side opposite to the first wall, 4. The length inspection jig according to claim 1, wherein a width from a lower edge to an upper edge of the opposing surface is equal to or smaller than a diameter of the rod-shaped member.

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