Measuring device

Abstract

To provide a length measuring device that allows adjustment of the horizontality of the bar section. [Solution] The length measuring device 1 comprises a slide rail 13, a slide body 21, a length measuring instrument 60 for measuring the slide distance of the slide body 21, and an arm member 30 held on the slide body 21 that contacts the workpiece. The arm member 30 has a base member 31 held on the slide body 21, a bar portion 40 connected and fixed to the base member 31 and contacting the workpiece, and a bar connecting and fixing member 50 for connecting and fixing the bar portion 40 to the base member 31. The bar connecting and fixing member 50 has a plurality of spacing adjustment bolts 52 for adjusting the gap between the base member 31 and the bar portion 40, and an elastic member 54 interposed between the base member 31 and the bar portion 40 and pressing in a direction that widens the gap between the base member 31 and the bar portion 40. The arm member 30 is adjustable in terms of the horizontality of the bar portion 40.

Description

Technical Field

[0001] The present invention relates to a length measuring device for measuring the length of a workpiece processed by a processing device.

Background Art

[0002] Conventionally, processing devices for performing various processes such as cutting, drilling, and scribing on a workpiece as a processed object have been widely spread. In such a processing device, in order to cut the workpiece at an accurate cutting position, it is necessary to accurately measure the length from a predetermined position of the workpiece to the processing position.

[0003] For this reason, a length measuring device for measuring the length of a workpiece processed by a processing device has been provided. For example, such a length measuring device is disclosed in Patent Documents 1 and 2 below. The length measuring devices disclosed in Patent Documents 1 and 2 are configured to measure the length of a workpiece from the measured value of a length measuring device provided on a slide body having an arm member that is slidably installed with respect to a slide rail and abuts on the end face of the workpiece, in a state where this abutting portion abuts on the end face of the workpiece.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, the arm member that abuts on the workpiece includes a bar portion whose tip contacts the workpiece during length measurement. However, when length measurement is repeated many times, due to the collision between the bar portion and the workpiece, distortion, displacement, etc. occur in the connection portion at the root of the bar portion.

[0006] Normally, the bar extends horizontally from the slide body in the length-measuring direction. However, if distortion or misalignment occurs in the connecting part, the bar may become tilted at an angle instead of being horizontal in the length-measuring direction. If the bar is tilted, it can lead to a decrease in the accuracy of measuring the length of the workpiece.

[0007] The present invention has been made in view of these problems, and aims to provide a length measuring device having a bar portion that contacts a workpiece processed by a processing device, wherein the degree of horizontality of the bar portion can be adjusted. [Means for solving the problem]

[0008] To solve the above problems, the present invention provides a length measuring device used in combination with a workpiece processing device for measuring the length of a workpiece processed by the workpiece processing device, comprising: a slide rail fixed relative to the workpiece processing device when measuring length; a slide body slidably mounted on the slide rail; a length measuring device for measuring the slide distance of the slide body relative to the slide rail; and an arm member held on the slide body that contacts the workpiece, wherein the arm member has a root member held on the slide body; a bar portion connected and fixed to the root member and contacting the workpiece; and a bar connecting and fixing member for connecting and fixing the bar portion to the root member, wherein the bar connecting and fixing member has a gap adjustment bolt for adjusting the gap between the root member and the bar portion; and an elastic member interposed between the bar portion and the root member and pressing in a direction that widens the gap between the bar portion and the root member, wherein the arm member is characterized in that the degree of horizontality of the bar portion can be adjusted. [Effects of the Invention]

[0009] According to the measuring device of the present invention, the degree of horizontality of the bar portion connected and fixed to the base plate by the bar connecting and fixing member can be easily adjusted. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view of a length measuring device according to an embodiment of the present invention. [Figure 2] Figure 2 is an upper perspective view of the base portion of the arm member according to an embodiment of the present invention. [Figure 3] Figure 3 is a downward perspective view of the base portion of the arm member according to an embodiment of the present invention. [Figure 4] Figure 4 is a perspective view of a root plate according to an embodiment of the present invention. [Figure 5] Figure 5 is a perspective view showing the configuration of the base portion of the bar according to an embodiment of the present invention. [Figure 6] Figure 6 shows the configuration of the base portion of the arm member according to an embodiment of the present invention. [Figure 7] Figure 7 is a front view of the base portion of the arm member according to an embodiment of the present invention. [Figure 8] Figure 8 is a perspective view illustrating the usage of a length measuring device according to an embodiment of the present invention. [Figure 9] Figure 9 is a perspective view of the base portion of an arm member according to a modified embodiment of the present invention. [Modes for carrying out the invention]

[0011] Hereinafter, with reference to the drawings, a length measuring device 1 according to an embodiment of the present invention will be described. In this embodiment, an example will be given of a device that measures the length of a workpiece that is cut to a predetermined length by a cutting device 9, which is a processing device. The length measuring device 1 is characterized by comprising a bar connecting and fixing member 50 that can adjust the degree of horizontality of the bar portion 40 of the arm member 30.

[0012] The length measuring device 1 comprises a base portion 10 fixed relative to the cutting device 9, and a slide portion 20 slidably mounted relative to the base portion 10. The base portion 10 comprises a rectangular base table 11 and a slide rail 13 installed on the base table 11 parallel to the longitudinal direction (length measuring direction).

[0013] The slide rail 13 has a pair of slide grooves 14 extending in the slide direction formed on both side surfaces in the slide direction which is its longitudinal direction. Further, at both longitudinal ends of the slide rail 13, slide stoppers are installed to prevent the slide portion 20 from detaching from the ends of the slide rail 13.

[0014] The slide portion 20 includes a slide body 21, an arm member 30 whose tip contacts the workpiece during length measurement, and a digital length measuring instrument 60, and the slide body 21 is installed so as to be slidable longitudinally with respect to the slide rail 13.

[0015] The slide body 21 includes a linear guide 22 fixed to the body, a clamp 25 for fixing the slide body 21 so as not to be slidable with respect to the slide rail 13, and an arm holding portion 27 for holding the arm member 30.

[0016] The arm holding portion 27 includes an arm support shaft 28 extending in the slide direction and a spring 29 through which the arm support shaft 28 passes. The spring 29 is installed so as to contact the arm member 30 pivotally supported by the arm support shaft 28 in a contracted state, and is configured to bias the arm member 30 toward the cutting position by the cutting device 9 in the slide direction by its elastic force.

[0017] The clamp 25 can switch between a fixed state in which the slide body 21 is fixed with respect to the slide rail 13 and a fixed-release state in which the slide body 21 is released to be slidable with respect to the slide rail 13 by operating the clamp lever.

[0018] The arm member 30 includes a base plate 31 which is a base member held by the slide body 21, a bar portion 40 extending from the base plate 31 toward the cutting position, and a bar connection fixing member 50 for connecting and fixing the bar portion 40 to the base plate 31 so that the levelness of the bar portion 40 can be adjusted.

[0019] Figure 4(a) is an upper perspective view of the base plate 31, and Figure 4(b) is a lower perspective view of the base plate 31. Figure 5(a) is an upper perspective view of the base portion of only the bar portion 40, and Figure 5(b) is an upper perspective view of the bar portion 40 and a part of the bar connecting fixing member 50. Figure 6(a) is a plan view of the base portion of the arm member 30, and Figure 6(b) is a cross-sectional view taken along line AA in Figure 6(a).

[0020] As shown in Figure 4, the base plate 31 has a retaining hole 32 through which the arm support shaft 28 of the slide body 21 passes, a through hole 33 for an adjustment bolt, a through screw hole 34 for a set screw, and a spring storage hole 35 formed in the plate portion. The retaining hole 32 is an elongated hole formed to pass through the base plate 31 from one end to the other along the measuring direction. By passing the arm support shaft 28 through the retaining hole 32, the base plate 31 is pivotally supported on the slide body 21, and as described above, the base plate 31 is supported in a state biased toward the tip by the spring 29.

[0021] The through-hole 33 for the adjustment bolt and the through-hole 34 for the set screw are holes formed by penetrating the base plate 31 vertically. The through-hole 34 for the set screw has internal threads, while the through-hole 33 for the adjustment bolt does not.

[0022] The through holes 33 for the adjustment bolts are formed at the same position in the width direction perpendicular to the length-measuring direction of the base plate 31, but are separated in the length-measuring direction. The through holes 33 for the adjustment bolts are cylindrical in shape, with a larger diameter section 33a formed at the upper entrance side and a smaller diameter section 33b formed at the lower side (see Figure 6(b)).

[0023] The through-holes 34 for the set screws are formed near the center in the direction of measurement and at two locations separated in a direction perpendicular to the direction of measurement. The straight line connecting the two through-holes 33 for the adjustment bolts and the straight line connecting the two through-holes 34 for the set screws intersect perpendicularly at their respective midpoints.

[0024] The spring storage hole 35 is a cylindrical hole formed from the lower surface of the base plate 31 to a predetermined height and length, and does not penetrate the base plate 31 vertically. That is, the entrance opening of the spring storage hole 35 is only visible on the lower surface of the base plate 31. The spring storage hole 35 is formed in two places on either side of the through hole 33 for the adjustment bolt on the base side in the width direction. Of course, the base plate 31 does not have to be entirely plate-shaped.

[0025] The bar portion 40 is an elongated, strip-shaped rod-shaped plate extending in the length measurement direction, and the tip workpiece contact surface 40a located at the end of the bar contact surface contacts the workpiece during length measurement (see Figure 1). This tip workpiece contact surface 40a serves as the length measurement reference surface for the length measuring device 1 during length measurement.

[0026] As shown in Figure 5(a), at the connection point between the bar portion 40 and the base plate 31, which is the base portion, two female threaded spacing adjustment screw holes 42 are formed at the center in the short direction (width direction) and separated in the long direction (measurement direction).

[0027] The bar connecting fixing member 50 includes two spacing adjustment bolts 52, two set screws 53, and two urethane springs 54. The spacing adjustment bolts 52 have a head 52a and a male threaded portion 52b. The head 52a, which has a larger diameter than the male threaded portion 52b, can fit into the larger diameter portion 33a of the through hole for the adjustment bolt in the base plate 31, but cannot fit into the smaller diameter portion 33b (see Figures 5 and 6, etc.).

[0028] Therefore, when the male threaded portion 52b of the spacing adjustment bolt 52 is inserted into the through hole 33 for the adjustment bolt from the upper entrance, the head 52a catches on the step at the boundary between the large diameter portion 33a and the small diameter portion 33b and connects to the base plate 31, and the spacing adjustment bolt 52 hangs from the base plate 31.

[0029] The spacing adjustment bolt 52 is engaged with this step, and the tip of the male threaded portion 52b is long enough to pass through the through hole 33 for the adjustment bolt and be exposed on the lower side of the base plate 31, and the tip of the male threaded portion 52b is screwed into the spacing adjustment screw hole 42 of the bar portion 40.

[0030] Therefore, in this state, when the spacing adjustment bolt 52 is turned in the direction of tightening the screw (clockwise), the male threaded portion 52 is screwed into the spacing adjustment screw hole 42, causing the base plate 31 to rise. Conversely, when the spacing adjustment bolt 52 is turned in the direction of loosening the screw (counterclockwise), the base plate 31 will fall down. In other words, the spacing adjustment bolt 52 can be used to adjust the gap between the lower surface of the base plate 31 and the upper surface of the bar portion 40.

[0031] The set screw 53 is a set screw with a hexagonal socket, which is screwed from above into the through-hole 34 for set screws in the base plate 31, and its tip is long enough to be exposed on the lower surface side of the base plate 31.

[0032] The tip of the set screw 53 contacts the upper surface of the base portion of the bar 40, which is connected and fixed to the lower surface of the base plate 31. This presses the base portion of the bar 40, which is suspended by the spacing adjustment bolt 52, downward, firmly fixing the connection between the base plate 31 and the bar 40.

[0033] As described above, the through-holes 34 for the set screws are formed at two locations separated in directions perpendicular to the measuring direction at the center of the base plate 31 in the measuring direction, and the two set screws 53 are installed by screwing them into the through-holes 34 for the set screws.

[0034] The set screw 53 is equipped with a loosening prevention nut 53a. After the tip of the set screw 53 is pressed against the bar portion 40, the loosening prevention nut 53a is tightened against the base plate 31, thereby preventing the set screw 53 from loosening and more firmly securing the connection between the base plate 31 and the bar portion 40.

[0035] In this embodiment, the two spacing adjustment bolts 52 are installed at the same position in the width direction of the bar section 40, and therefore the degree of horizontality in the width direction of the bar section 40 cannot be adjusted. In contrast, the two set screws 53 are installed at separate positions in the width direction of the bar section 40, so it is possible to adjust the inclination of the bar section 40 in the width direction by adjusting the length of exposure of the two set screws 53 to the lower surface of the base plate 31.

[0036] The urethane spring 54 is a cylindrical urethane elastic member interposed between the base plate 31 and the bar portion 40, housed within a spring storage hole 35 formed in the base plate 31. Its diameter is slightly smaller than the inner diameter of the spring storage hole 35. In this embodiment, the length of the urethane spring 54 is set to be approximately 6 mm longer than the length of the spring storage hole 35, with a total length of 19 mm.

[0037] When the base plate 31 and the bar portion 40 are connected and fixed, if the gap between the base plate 31 and the bar portion 40 becomes 6 mm or less, the urethane spring 54 housed in the spring storage hole 35 is compressed in the longitudinal direction, and its elastic force pushes the lower surface of the base plate 31 and the upper surface of the base portion of the bar portion 40 apart, that is, in a direction that widens the gap between them.

[0038] In the arm member 30 with this configuration, the combination of the spacing adjustment bolt 52 and the spacing adjustment screw hole 42 is installed separately on the base side and the tip side of the base plate 31. When the base side spacing adjustment bolt 52 raises the base side of the bar section 40, or when the tip side spacing adjustment bolt 52 lowers the tip side of the bar section 40, the tip side of the bar section 40 lowers.

[0039] Conversely, lowering the base of the bar section 40 using the spacing adjustment bolt 52 at the base, or raising the tip of the bar section 40 using the spacing adjustment bolt 52 at the tip, will raise the tip of the bar section 40. This allows adjustment of the horizontality of the bar section 40 in the length-measuring direction.

[0040] Here, since the bar section 40 extends from the base plate 31 to the cutting position, a force acts on the tip of the bar section 40, with its own weight acting as a fulcrum at the connection point between the bar section 40 and the base plate 31, causing it to move downwards.

[0041] Furthermore, in this embodiment, the spacing adjustment bolt 52 is fixed to the bar portion 40 by screwing its tip, whereas it is not fixed to the base plate 31, but is simply inserted into the non-threaded through-hole 33 for the adjustment bolt. Therefore, if there is a gap between the base plate 31 and the bar portion 40 at the position of the spacing adjustment bolt 52, the spacing adjustment bolt 52 can move upward relative to the base plate 31 together with the bar portion 40 until this small gap is closed.

[0042] Furthermore, if the urethane spring 54 is not interposed between the base plate 31 and the bar portion 40, then a force will act on the tip of the bar portion 40, causing it to descend and the base of the bar portion 40 to rise, with one part of the bar connecting fixing member 50 acting as a fulcrum.

[0043] In this state, if you turn either of the two spacing adjustment bolts 52 or the two set screws 53 to adjust the horizontality of the bar section 40, the tip of the set screw 53 may separate from the bar section 40, and the spacing adjustment bolt 52 at the base may rise and become loose.

[0044] Thus, each time the spacing adjustment bolt 52 is adjusted, if the spacing adjustment bolt 52 becomes loose, the bar section 40 will tilt in an unintended direction, requiring repeated adjustments.

[0045] In contrast, in this embodiment, a urethane spring 54 is interposed between the base plate 31 and the bar portion 40. Its elastic force constantly presses in a direction that widens the gap between the base plate 31 and the bar portion 40, preventing the gap adjustment bolt 52 from lifting up. This prevents the bar portion 40 from tilting in an unintended direction each time its horizontality is adjusted. As a result, the horizontality of the bar portion 40 can be adjusted easily and efficiently.

[0046] Figure 7 shows that by lowering the base side of the bar section 40 using the spacing adjustment bolt 52 at the base side, a gap is created between the base plate 31 and the bar section 40 at the base side, and the tip side of the bar section 40 is slightly raised and tilted.

[0047] In the figure, the urethane spring 54 presses the base plate 31 and the bar portion 40 in a direction away from each other at the base end of the bar portion 40, creating a small gap between them. The set screw 53 has its tip slightly exposed in this gap and is pressed against the upper surface of the bar portion 40, firmly fixing the relative positions of the base plate 31 and the bar portion 40 so that they do not move closer together and the gap between them shortens, against the elastic force of the urethane spring 54.

[0048] The digital measuring instrument 60 includes a distance measuring unit (not shown) for measuring the sliding distance of the slide body 21 relative to the slide rail 13, a display unit 62 which is a display that digitally displays the measured value measured by the distance measuring unit, and a reset button (not shown) for resetting the measured value of the distance measuring unit.

[0049] Here, the length measuring device 1 is used to measure the distance from the workpiece's processing position (cutting position) to a predetermined part of the workpiece that is to be measured. The distance measuring unit is configured to output the distance from the point where the slide distance is reset by the reset button as the origin, and the distance from this origin as the measured value.

[0050] The distance measuring unit measures with the direction away from the cutting position (approximately upward in Figure 1) as the positive direction, and is configured to display the distance from the origin to the current position of the slide body 21, rather than the total slide distance of the slide body 21 from the origin. The digital length measuring instrument 60 is powered by a built-in battery and does not require a power cord connection, so the length measuring device 1 does not require wiring and can be freely installed in any location.

[0051] The configuration of the length measuring device 1 has been described above. Next, the procedure for cutting the workpiece to a predetermined length using the cutting device 9 while measuring the length of the workpiece using the length measuring device 1 will be explained with reference to Figure 8.

[0052] First, before setting up the workpiece, the origin of the measuring device 1 (digital measuring instrument 60) is reset. The origin of the slide distance of the digital measuring instrument 60 is reset when the tip workpiece contact surface 40a, which is the measuring reference surface, is positioned at the processing position (cutting position) by the processing device (cutting device 9).

[0053] Specifically, with the cutting blade 91 of the cutting device 9 in its initial position (0°), perpendicular to the length measurement direction, the sliding part 20 is slid to bring the tip workpiece contact surface 40a, which is the length measurement reference surface, into contact with the surface of the cutting blade 91, and the reset button of the digital length measuring device 60 is pressed to reset the measured value to 0.

[0054] In this case, if the bar portion 40 is tilted from a horizontal position in the length-measuring direction, the tip workpiece contact surface 40a will be tilted from a vertical position, and therefore will not be able to make surface contact with the surface of the cutting blade 91, but will only make contact at a point or along a line.

[0055] If the origin is reset in this state, the length of the workpiece cannot be measured accurately. Therefore, before resetting the origin, it is necessary to adjust the degree of horizontality of the bar section 40 in the length-measuring direction using the bar connecting fixing member 50.

[0056] Next, in order to position the workpiece at the cutting position, the slide unit 20 is moved away from the cutting position. At this time, the display unit 62 of the digital measuring instrument 60 displays the current distance from the cutting position where the measurement value was reset to the tip workpiece contact surface 40a, which is the length measurement reference surface.

[0057] Then, the slide unit 20 is stopped at the position where the measurement value on the display unit 62 corresponds to the desired length, and fixed with the clamp 25. This makes the distance from the cutting position, which is the origin, to the tip workpiece contact surface 40a, which is the length measurement reference surface, equal to the desired length. In this state, if the workpiece is placed at the cutting position so that one end contacts the tip workpiece contact surface 40a, the workpiece can be cut to the desired length.

[0058] As described above, according to this embodiment, the degree of horizontality of the bar portion 40, which is connected and fixed to the base plate 31 by the bar connecting and fixing member 50, can be easily adjusted. Furthermore, the degree of horizontality of the bar portion 40 in the measuring direction can be easily adjusted by the spacing adjustment bolt 52.

[0059] In particular, in this embodiment, a urethane spring 54, which is an elastic member that presses in a direction that widens the gap between the base plate 31 and the bar portion 40, is installed. As a result, an elastic force that widens the gap is always acting between the base plate 31 and the bar portion 40, preventing the bar portion 40 from tilting unintentionally when operating the spacing adjustment bolt 52 or the set screw 53, and allowing for easy and efficient adjustment of the horizontality of the bar portion 40.

[0060] Furthermore, in this embodiment, a set screw 53 is installed, which firmly fixes the horizontality of the bar section 40 adjusted by the spacing adjustment bolt 52.

[0061] Next, a modified example of this embodiment will be described with reference to Figure 9. This modified example is characterized in that the vertical positions of the base plate 31' and the bar portion 40' of the arm member 30' are reversed compared to the above embodiment. The other configurations are the same, so the explanation will focus on the differences. Figure 9(a) is a perspective view of the base portion of the arm member 30' seen from above, and Figure 9(b) is a perspective view seen from below.

[0062] In this modified example, the base portion of the bar portion 40' rests on the upper surface of the base plate 31', and the two are connected and fixed by the bar connecting and fixing member 50'. In this modified example, the bar connecting and fixing member 50' is equipped with three spacing adjustment bolts 52', four set screws 53', and one urethane spring (not shown).

[0063] A urethane spring (not shown) is interposed in a compressed state between the bar portion 40' and the base plate 31' at the center of the four set screws 53'. In this modified example, a spring storage hole (not shown) is formed on the lower side of the bar portion 40', and the spring is housed there. This modification also provides the same effects as the above embodiment.

[0064] Although embodiments of the present invention, including modifications, have been described above, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. For example, the shape, size, material, etc., of each component constituting the length measuring device according to this embodiment can be changed as appropriate. Furthermore, in the above embodiment, the length measuring device used in combination with the processing device (cutting device) is configured to be directly fixed to the processing device. However, the length measuring device only needs to be configured to be stably and relatively fixed to the processing device so that the length of the workpiece can be measured next to the processing device. It may even be a freestanding length measuring device installed on the floor next to the processing device.

[0065] Furthermore, the elastic member interposed between the base plate and the bar section, which presses in a direction that widens the gap between them, is not limited to a urethane spring; other elastic members that exhibit elastic force, such as coil springs or leaf springs, can be appropriately applied.

[0066] Furthermore, in the above embodiment, through holes for adjustment bolts, through holes for set screws, and spring storage holes are provided on the base plate side, and screw holes for spacing adjustment are provided on the bar side. However, these can be provided on the opposite side as appropriate, and spring storage holes may be provided on both sides. [Explanation of Symbols]

[0067] 1. Measuring device 10 Base section 11 Base 13 Slide rails 14 slide grooves 20 Slide section 21 Slide body 22 Linear Guide 25 clamps 27 Arm holding section 28 Arm support shaft 29 Spring 30 Arm Member 31. Base plate (base component) 32 Holding hole 33 Through-hole for adjustment bolt 33a Large diameter part 33b Small diameter part 34 Through-holes for set screws 35 spring storage holes 40 bar section 40a Tip workpiece contact surface (measurement reference surface) 42 screw holes for spacing adjustment 50 Bar connecting and fixing member 52 Spacing adjustment bolts 52a head 52b Male threaded section 53 Set screws 53a Anti-loosening nut 54 Urethane springs 60 Digital measuring instrument 62 indicates the section 9. Cutting device 91 Cutting blade

Claims

1. A length measuring device used in combination with a workpiece processing device, which measures the length of a workpiece processed by the workpiece processing device, A slide rail that is fixed relative to the workpiece processing device when measuring length, A slide body is slidably attached to the aforementioned slide rail, A measuring device for measuring the sliding distance of the slide body relative to the slide rail, The slide body is held by an arm member that contacts the workpiece, The aforementioned arm member is The base member held by the slide body, A bar portion is connected and fixed to the aforementioned base member and contacts the workpiece, The bar portion is connected to and fixed to the base member, and the bar connecting and fixing member is provided. The aforementioned bar connecting and fixing member is Multiple spacing adjustment bolts for adjusting the gap between the base member and the bar portion, It has an elastic member interposed between the front base member and the bar portion, which presses in a direction that widens the gap between the base member and the bar portion, The arm member is characterized in that it can adjust the degree of horizontality of the bar portion of the length measuring device.

2. The measuring device according to claim 1, characterized in that the spacing adjustment bolts are installed at multiple positions that are separated in the measuring direction.

3. The measuring device according to claim 1, characterized in that the head of the spacing adjustment bolt is connected to either the base member or the bar portion, and the male thread at the tip is screwed into a female thread formed on the other of the bar portion or the base member, thereby preventing the base member and the bar portion from separating beyond a predetermined gap and allowing the gap to be variably connected.

4. The measuring device according to claim 1, wherein the bar connecting fixing member further has a set screw that passes through and screws into a female screw formed in one of the base member or the bar portion, and presses its passing tip against the other of the bar portion or the base member to firmly fix the gap.

5. The elastic member is a urethane spring, The length measuring device according to claim 1, characterized in that at least one of the base member or the bar portion has a storage hole formed in it for storing the urethane spring with a portion of it protruding.

6. The base member or bar portion to which the head of the spacing adjustment bolt is connected has a through hole through which the spacing adjustment bolt passes, and a stepped portion for the head to catch is formed on the entrance side of the through hole. The measuring device according to claim 3, characterized in that the head portion catches on the stepped portion, thereby restricting the base member and the bar portion from separating by more than a predetermined distance.

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