Gear measuring machine

Abstract

A gear measuring machine (1) provided in a machining line (100) for gear machining a workpiece (W) comprises: a workpiece holding device (50) for detachably holding the workpiece; a measurement device (30) for measuring the workpiece by detecting displacement of a probe (31) in contact with the workpiece; a measurement device attachment part (20) to which the measurement device is attached; a bed (10) for supporting the measurement device attachment part; and a cover (60) for collectively covering said components. The cover has an opening / closing part (66) that opens when the workpiece is attached to the workpiece holding device and when the workpiece is removed from the workpiece holding device, and closes when the workpiece is measured by the measurement device. The bed has a movement mechanism (40) for reciprocating the measurement device attachment part between a retract position (P1) and a measurement position (P2). The movement mechanism moves the measurement device attachment part to the retract position when the workpiece is held by the workpiece holding device, and moves the measurement device attachment part to the measurement position when measuring the workpiece.

Description

Technical Field

[0001] The present invention relates to a gear measuring machine.

Background Art

[0002] Conventionally, various gear measuring machines for measuring gears formed on a workpiece have been proposed. For example, Patent Document 1 discloses a configuration in which a gear measuring function is provided in a gear processing machine. Further, Patent Document 2 discloses a configuration in which a gear measuring machine is incorporated into a processing line for in-line inspection.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configurations disclosed in Patent Document 1 and Patent Document 2, no consideration is given to the fact that dust and oil mist generated by gear processing of a workpiece in a gear processing machine or a processing line affect the gear measuring machine and reduce the measurement accuracy. Therefore, usually, the gear measuring machine is configured separately from the gear processing machine and is installed in a measurement room outside the processing line so as not to be affected by dust and oil mist generated in the processing line. In this case, it is necessary to manually carry the processed workpiece into the measurement room and install it on the gear measuring machine for measurement, which is time-consuming.

[0005] In addition, since automation of workpiece attachment / detachment is not considered in a conventional gear measuring machine installed in a measurement room, if a transfer device or the like for automating workpiece attachment / detachment is provided in such a gear measuring machine, there is a risk that the transfer device will interfere with the measurement unit of the gear measuring machine.

[0006] This disclosure is made in view of these circumstances and aims to provide a gear measuring machine that can be installed on a processing line, automate the loading and unloading of workpieces, and improve measurement accuracy. [Means for solving the problem]

[0007] One aspect of the present disclosure is a gear measuring machine installed in a machining line for machining gears on a workpiece, A workpiece holding device for detachably holding the above workpiece, A measuring device that detects the displacement of a probe in contact with the workpiece and measures the workpiece, The measuring device mounting section to which the above measuring device is attached, A bed that supports the above-mentioned measuring device mounting section, The device comprises the above-mentioned workpiece holding device, the above-mentioned measuring device, the above-mentioned measuring device mounting section, and a cover that covers the bed collectively, The cover has an opening / closing section that is configured to be opened when attaching the workpiece to the workpiece holding device and when removing it from the workpiece holding device, and to be closed when the workpiece attached to the workpiece holding device is measured by the measuring device. The bed has a moving mechanism that allows the measuring device mounting section to reciprocate between a retracted position spaced away from the workpiece holding device and a measuring position close to the workpiece holding device. The above-described movement mechanism is configured to move the measuring device mounting portion to the retracted position when the workpiece is held in the workpiece holding device, and to move the measuring device mounting portion to the measuring position when the workpiece held in the workpiece holding device is measured. Occasionally, The above workpiece holding device has a cylindrical space that opens vertically upward on the rotation axis of the workpiece and whose axis is the rotation axis of the workpiece. The cylindrical space described above is configured to accommodate a reference block for calibrating the position of the rotation axis of the workpiece in the workpiece holding device. The above-mentioned reference block consists of a cylindrical member that is inserted into the cylindrical space and fixed to a rotating part provided in the workpiece holding device, the central axis of the inner surface of the reference block is located coaxially with the rotation axis of the rotating part, and when calibrating the position of the rotation axis of the workpiece, the probe is configured to contact the inner surface of the cylindrical member. It's in the gear measuring machine. [Effects of the Invention]

[0008] According to the gear measuring machine of the above embodiment, the measuring device mounting section is positioned in a retracted position when attaching and detaching workpieces, and in a measuring position when measuring workpieces held by the workpiece holding device. This prevents interference between the measuring device and conveying devices for attaching and detaching workpieces provided on the processing line. As a result, the attachment and detachment of workpieces can be automated within the processing line. Furthermore, the machine is equipped with a cover that encloses the workpiece holding device, measuring device, measuring device mounting section, and bed as a whole. The cover has an opening and closing mechanism that opens when attaching and detaching workpieces and closes during measurement. This prevents dust and oil mist generated on the processing line from entering the gear measuring machine, thus preventing a decrease in measurement accuracy.

[0009] As described above, according to one embodiment, a gear measuring machine can be provided that can be installed on a processing line, automate the loading and unloading of workpieces, and improve measurement accuracy. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a conceptual diagram showing the configuration of the processing line in Embodiment 1. [Figure 2] Figure 2 is a first side view of the gear measuring machine of Embodiment 1. [Figure 3] Figure 3 is a second side view with partial transparency of the gear measuring machine of Embodiment 1. [Figure 4] Figure 4 is a perspective view with partial transparency of the gear measuring machine according to Embodiment 1. [Figure 5] Figure 5 is a first perspective view of the gear measuring machine of Embodiment 1. [Figure 6] Figure 6 is a second perspective view of the gear measuring machine of Embodiment 1. [Figure 7] Figure 7 is a front perspective view of the measuring device mounting section of Embodiment 1. [Figure 8] Figure 8 is a rear perspective view of the measuring device mounting section of Embodiment 1. [Figure 9] Figure 9 is a top view of the measuring device mounting section of Embodiment 1. [Figure 10] FIG. 10 is a longitudinal sectional view of the work holding device of Embodiment 1 with a reference block attached thereto.

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] (Embodiment 1) 1. Processing line 100 As shown in FIG. 1, the gear measuring machine 1 of the present Embodiment 1 is incorporated in a processing line 100. In the present embodiment, the processing line 100 includes a plurality of processing devices 101 to 103 and the gear measuring machine 1, and the gear measuring machine 1 is provided at the final position of the line L in the processing line 100. In the present embodiment, the transfer direction of the work W in the processing line 100 is defined as L. Note that the arrangement of the gear measuring machine 1 in the processing line 100 may not be at the final position but at an intermediate position of the line L. The processing devices 101 to 103 are not particularly limited and can be known machine tools. The processing line 100 performs gear machining for processing a work W to be processed into the shape of a gear. The gear may be an internal gear or an external gear.

[0012] In the processing line 100, a plurality of processing devices 101 to 103 sequentially perform processing on the work W, and the gear measuring machine 1 measures the work W processed by the plurality of processing devices 101 to 103. In this way, the processing line 100 continuously performs processing and measurement of the work W and also performs continuous production of a plurality of works W.

[0013] In order to realize continuous production, the processing line 100 includes a transfer device 104 for loading and unloading the work W. The transfer device 104 may be arranged for each of the processing devices 101 to 103 and the gear measuring machine 1, or may be arranged across the plurality of processing devices 101 to 103 and the gear measuring machine 1. For example, a serial robot type transfer device, a loader type transfer device, an automated guided vehicle (AGV), etc. can be applied as the transfer device 104.

[0014] 2. Configuration of the gear measuring machine 1 As shown in Figure 2, the gear measuring machine 1 comprises a bed 10, a measuring device mounting section 20, a measuring device 30, a moving mechanism 40, a workpiece holding device 50, a cover 60, and a measurement result transmission unit 70. A transport device 104 for loading and unloading workpieces W to and from the gear measuring machine 1 is provided near the gear measuring machine 1. The type of gear measuring machine 1 is not limited and can be a vertical measuring machine that measures by moving the probe vertically or a horizontal measuring machine that measures by moving the probe horizontally. In this embodiment, a vertical measuring machine is used, as will be described later. In the gear measuring machine 1, the front-to-back direction parallel to the line L is X, the vertical direction is Z, and the width direction perpendicular to the X and Z directions is Y.

[0015] 2-1. Bed 10 The bed 10 constitutes the base of the gear measuring machine 1, and its upper surface 11 is substantially flat, with a plurality of legs 12 at the bottom. The form of the bed 10 is not limited, but in this embodiment it is constructed by combining sheet metal and is hollow. The hollow part of the bed 10 may be filled with a filler. In the bed 10, a recess 13 with a recessed upper surface 11 is formed in the area on the processing device 103 side adjacent to the gear measuring machine 1, and a workpiece holding device 50, which will be described later, is provided therein.

[0016] 2-2. Measuring device mounting section 20 The measuring device mounting section 20 is provided on the upper surface 11 of the bed 10. The measuring device mounting section 20 is also called a slider. The measuring device mounting section 20 is reciprocally movable on the upper surface 11 of the bed 10 in the direction in which the guide rails 41 extend (in this embodiment, in a direction parallel to line L) via a pair of guide rails 41 that constitute the moving mechanism 40 described later.

[0017] The method for determining the shape of the measuring device mounting section 20 is not limited, but in this embodiment, it was determined based on the optimized shape obtained by performing topology optimization processing based on the results of stress analysis of the measuring device mounting section 20 based on elements that fluctuate in the measuring device mounting section 20. The elements that fluctuate in the measuring device mounting section 20 are not limited, and examples include temperature changes of the measuring device 30 attached to the measuring device mounting section 20, and the position of the load applied to the measuring device mounting section 20 that fluctuates depending on the position state of the probe in the measuring device 30. In this embodiment, the temperature change of the measuring device 30 was adopted as the element that fluctuates in the measuring device mounting section 20, and the optimized shape was calculated by performing stress analysis and topology optimization processing, and the shape of the measuring device mounting section 20 shown in Figures 7 to 9 was determined based on the optimized shape. As a result, the machine configuration (structure) is such that measurement accuracy can be ensured even if the room temperature inside the factory changes.

[0018] As shown in Figures 7-9, the measuring device mounting section 20 includes a pair of bases 21 connected to the guide rail 41, and a plurality of lateral ribs 22 erected vertically in the Z direction on each of the pair of bases 21. Between the lateral ribs 22 facing each other in the width direction Y, there are a first central rib 23 and a second central rib 24 extending in the width direction Y and the vertical direction Z. The first central rib 23 is located on the side of the processing device 103 adjacent to the gear measuring machine 1 (front side), and the second central rib 24 is located on the opposite side. The lower vertical ends of the first central rib 23 and the second central rib 24 are provided with a flat section 25 extending in the width direction Y and the front-to-back direction X. The measuring device 30, which will be described later, is fixed to the surface of the first central rib 23 on the side of the processing device 103 adjacent to the gear measuring machine 1 (front side). A rear rib 27 is connected to the rear side of the second central rib 24, erected vertically in the Z direction from the flat section 25 and extending in the front-to-back direction X.

[0019] As shown in Figure 9, the end portion 251 of the flat section 25 on the side of the processing device 103 adjacent to the gear measuring machine 1 (front side) has multiple arcs that are continuously curved in a wave-like manner, and a first through hole 261 has a portion that follows the shape of the end portion 251, located inside (back side) of the end portion 251. The flat section 25 also has a second through hole 262 located on the back side of the first through hole 261. A portion of the first central rib 23 overlaps with the first through hole 261 when viewed from above in the vertical direction Z.

[0020] 2-3. Measuring device 30 As shown in Figure 4, the measuring device 30 includes a probe 31, a probe holder 32, a first slide base 33, a first guide 34, a second slide base 35, and a second guide 36. The first guide 34 extends in the width direction Y, and the first slide base 33 is provided on the first guide 34 and is configured to be movable in the width direction Y. The second guide 36 is provided on the first slide base 33 and extends in the vertical direction Z. The second slide base 35 is provided on the second guide 36 and is configured to be movable in the vertical direction Z. The probe 31 is substantially rod-shaped and is held by the probe holder 32. The probe holder 32 is provided on the second slide base 35.

[0021] The first guide section 34 and the second guide section 36 are driven by a drive device (not shown), and the probe 31 is positioned in the width direction Y and the vertical direction Z by the driving of the first guide section 34 and the second guide section 36. Positioning in the front-rear direction X is performed by a moving mechanism 40, which will be described later. A displacement detection device (not shown) is connected to the probe 31 to detect the displacement of the probe 31 after positioning. The measuring device 30 then measures the OBD (Over Ball (Pin) Diameter) and BBD (Between Ball Diameter) of the workpiece W by bringing the probe 31 into contact with the tooth grooves of the workpiece W (gear) from the front-rear direction X, the width direction Y, or the vertical direction Z.

[0022] 2-4. Moving mechanism 40 The moving mechanism 40 is configured to move the measuring device mounting section 20 back and forth between the retracted position P1 shown in Figure 2 and the measuring position P2 shown in Figure 3. The moving mechanism 40 includes a pair of guide rails 41 provided on the upper surface 11 of the bed 10 shown in Figure 4, and a drive unit 42. The pair of guide rails 41 are provided on the upper surface 11 of the bed 10 and extend in the front-rear direction X. The measuring device mounting section 20 is movable in the front-rear direction X along the pair of guide rails 41.

[0023] As shown in Figure 3, the measurement position P2 is a position where the measuring device mounting section 20 is close to the workpiece holding device 50, which will be described later. When the measuring device mounting section 20 is at the measurement position P2, the measuring device 30 measures the workpiece W. As shown in Figure 2, the retracted position P1 is a position where the measuring device mounting section 20 is separated from the workpiece holding device 50. When the measuring device mounting section 20 is at the retracted position P1, the measuring device mounting section 20 is retracted from the area R above the workpiece holding device 50 in the vertical direction, so that the transport device 104 and the measuring device 30 do not interfere with each other when the transport device 104 loads and unloads the workpiece W in area R.

[0024] 2-5. Workpiece holding device 50 The workpiece holding device 50 includes a workpiece holding section 51 for holding a workpiece W, and a rotation mechanism 52 for rotating the workpiece holding section 51 to a position of any desired rotation angle. In this embodiment, as shown in Figure 10, the workpiece holding section 51 has a plurality of engagement sections 511 that protrude vertically, and holds the workpiece W by pressing these engagement sections 511 radially outward against the inner cylindrical surface of the workpiece W which constitutes the external gear. Inside the plurality of engagement sections 511, a cylindrical space 512 is formed with the rotation axis 50a as its axis. The workpiece holding section 51 is fixed to a rotary table 521 provided on the rotation mechanism 52. The rotation mechanism 52 rotates the workpiece holding section 51 to a position of any desired rotation angle by rotationally driving the disc-shaped rotary table 521.

[0025] The workpiece holding device 50 uses the reference block 53 shown in Figure 10 when calibrating the workpiece holding device 50. The reference block 53 is substantially cylindrical and, as shown in Figure 10, can be attached to the rotary table 521 via fixing screws 522 while inserted into the cylindrical space 512 of the workpiece holding section 51. The central axis of the inner surface of the reference block 53 is coaxial with the rotation axis of the rotary table 521. When calibrating the workpiece holding device 50, the rotation center of the rotary table 521 can be calibrated by attaching the reference block 53 to the rotary table 521 via the cylindrical space 512 and measuring the inner surface of the opening 531 at the upper end of the reference block 53 with the probe 31.

[0026] 2-6. Cover 60 As shown in Figures 4, 5, and 6, the cover 60 covers the bed 10, the measuring device mounting section 20, the measuring device 30, the moving mechanism 40, and the workpiece holding device 50 together. The cover 60 is erected on the floor and includes a front wall section 61, a rear wall section 62, a right side wall section 63, a left side wall section 64 that surround the above components 10 to 50, and a ceiling section 65 provided at the upper ends of each wall section 61 to 64 to cover the upper part. Also, as shown in Figures 5 and 6, an opening / closing section 66 is provided on the front wall section 61. The configuration of the opening / closing section 66 is not limited, but in this embodiment, the right door 66a and the left door 66b are configured to open and close by sliding left and right. When loading and unloading workpieces W from above the workpiece holding device 50, the opening / closing section 66 may be provided on the ceiling section 65 instead of the front wall section 61.

[0027] As shown in Figure 2, the opening / closing section 66 is configured to open when attaching the workpiece W to the workpiece holding device 50 and when removing it from the workpiece holding device 50, and to close when measuring the workpiece W attached to the workpiece holding device 50 with the measuring device 30. The opening and closing operation of the opening / closing section 66 is performed by a drive mechanism (not shown).

[0028] 2-7. Measurement result transmission unit 70 The measurement result transmission unit 70 shown in Figure 1 displays the measurement results from the measuring device 30 on a display screen (not shown) in the gear measuring machine 1, or transmits them to a control device (not shown). Furthermore, the measurement result transmission unit 70 transmits the measurement results from the measuring device 30 to at least one processing device 101 to 103 included in the processing line 100. Upon receiving the measurement results, the processing devices 101 to 103 can adjust the processing conditions in the processing devices 101 to 103 according to the measurement results.

[0029] 3. Effects In this embodiment of the gear measuring machine 1, the measuring device mounting section 20 is located in a retracted position P1 when attaching and detaching the workpiece W, and in a measuring position P2 when measuring the workpiece W held by the workpiece holding device 50. This prevents interference between the measuring device 30 and the transport device 104 for attaching and detaching the workpiece W provided on the processing line L. This enables the automation of attaching and detaching the workpiece W within the processing line L. Furthermore, the machine is equipped with a cover 60 that covers the bed 10, measuring device 30, measuring device mounting section 20, moving mechanism 40, and workpiece holding device 50 together. The cover 60 is provided with an opening / closing section 66 that opens when attaching and detaching the workpiece W and closes during measurement. This prevents dust and oil mist generated on the processing line L from entering the gear measuring machine 1, thus preventing a decrease in measurement accuracy.

[0030] Furthermore, in this embodiment 1, the probe 31 is configured to contact the workpiece W by moving vertically downward toward the workpiece W from above the workpiece W in the vertical direction Z when the measuring device mounting part 20 is located at the measuring position P2. As a result, since the gear measuring machine 1 is a so-called vertical measuring machine, it is easier to obtain higher measurement accuracy compared to a horizontal measuring machine in which the probe is moved horizontally to perform the measurement. In addition, horizontal measuring machines have poor accuracy, especially at the front / rear or left / right ends, because the probe is tilted due to the influence of gravity, but vertical measuring machines are less affected by gravity and therefore have better accuracy than horizontal measuring machines.

[0031] Furthermore, in this embodiment 1, the moving mechanism 40 includes a pair of guide rails 41 provided on the upper surface of the bed 10, and a drive device 42 that moves the measuring device mounting section 20, which is placed on the pair of guide rails 41, back and forth between a retracted position P1 and a measuring position P2 along the pair of guide rails 41. This allows the measuring device mounting section 20 to move stably back and forth between the retracted position P1 and the measuring position P2.

[0032] Furthermore, in this embodiment 1, the bed 10 has a recess 13 that is recessed vertically downward in the Z direction from the upper surface 11 of the bed 10, at a position vertically downward in the Z direction from the probe 31 when the measuring device mounting part 20 is in the measuring position P2. The workpiece holding device 50 is provided in the recess 13 and has a rotation mechanism 52 that rotates the held workpiece W around the vertical Z direction as an axis. As a result, by simply moving the measuring device mounting part 20 to the retracted position P1, the transport device 104 and the measuring device 30 do not interfere with each other when the transport device 104 attaches the workpiece W to and detaches it from the workpiece holding device 50, and switching between the retracted position P1 and the measuring position P2 is made easy.

[0033] Furthermore, in this embodiment 1, the recess 13 is located vertically below Z of the probe 31 when the measuring device mounting portion 20 is at the measuring position P2, and is positioned between the pair of guide rails 41. This allows the probe 31 to be positioned vertically above Z of the workpiece W while the measuring device 30 is sufficiently supported via the pair of guide rails 41 and the measuring device mounting portion 20, thereby improving measurement accuracy.

[0034] Furthermore, in this embodiment 1, the measuring device mounting section 20 is subjected to stress analysis based on fluctuating elements. Topology optimization processing is then performed based on the results of the stress analysis. The measuring device mounting section 20 has a shape determined based on the optimized shape obtained through the topology optimization processing. This makes it possible to optimize the shape of the measuring device mounting section 20, which has fluctuating elements, with higher precision. For example, one of the fluctuating elements is the change in room temperature inside the factory where the gear measuring machine 1 is installed. However, because the shape of the measuring device mounting section 20 has a shape determined based on the optimized shape, the measurement accuracy of the gear measuring machine 1 can be ensured even if the room temperature inside the factory changes.

[0035] Furthermore, in this embodiment 1, the measuring device mounting portion 20 has a flat portion 25 located vertically Z-downward of the portion (first central rib 23) to which the measuring device 30 is attached. The end portion 251 on the front side (workpiece holding device 50 side) of the flat portion 25 has multiple arcs that are continuously curved in a wave-like manner, and there is a through hole 261 located inside the end portion 251 that follows the shape of the end portion 251. This ensures the rigidity of the measuring device mounting portion 20 while reducing its weight.

[0036] Furthermore, in this embodiment 1, the workpiece holding device 50 has a cylindrical space 512 that opens vertically upward on the rotation axis of the workpiece W, and a reference block 53 for position calibration of the rotation axis 50a of the workpiece W in the workpiece holding device 50 is configured to be installed in the cylindrical space 512. The reference block 53 is a cylindrical member that is inserted into the cylindrical space 512 and fixed to a rotary table 521, which is a rotating part provided in the workpiece holding device 50, and when position calibration of the rotation axis 50a of the workpiece W is performed, the probe 31 is configured to contact the inner circumferential surface of the reference block 53. This makes it possible to perform position calibration of the rotation axis 50a of the workpiece W with high precision.

[0037] Furthermore, by continuously calibrating the position of the rotating shaft 50a using the reference block 53, the position of the rotating shaft 50a can be maintained even in a processing line 100 where temperature changes are likely to occur, and the measurement accuracy of the measuring device 30 can be maintained.

[0038] Furthermore, this embodiment 1 includes a measurement result transmission unit 70 that transmits the measurement results from the measuring device 30 to at least one processing device 101-103 included in the processing line 100. This allows the measurement results from the measuring device 30 to be fed back to the processing devices 101-103, thereby improving the processing accuracy of the processing devices 101-103.

[0039] In this embodiment, by applying a mechanism that constitutes a tailstock as the workpiece holding device 50, it is also possible to measure gears formed on a shaft-shaped workpiece W.

[0040] As described above, according to one embodiment, a gear measuring machine can be provided that can be installed on a processing line, automate the loading and unloading of workpieces, and improve measurement accuracy.

Claims

1. A gear measuring machine installed in a machining line for machining gears on a workpiece, A workpiece holding device for detachably holding the above workpiece, A measuring device that detects the displacement of a probe in contact with the workpiece and measures the workpiece, The measuring device mounting section to which the above measuring device is attached, A bed that supports the above-mentioned measuring device mounting section, The device comprises the above-mentioned workpiece holding device, the above-mentioned measuring device, the above-mentioned measuring device mounting section, and a cover that covers the bed collectively, The cover has an opening / closing section that is configured to be opened when attaching the workpiece to the workpiece holding device and when removing it from the workpiece holding device, and to be closed when the workpiece attached to the workpiece holding device is measured by the measuring device. The bed has a moving mechanism that allows the measuring device mounting section to reciprocate between a retracted position spaced away from the workpiece holding device and a measuring position close to the workpiece holding device. The above-described movement mechanism is configured to move the measuring device mounting portion to the retracted position when the workpiece is held in the workpiece holding device, and to move the measuring device mounting portion to the measuring position when the workpiece held in the workpiece holding device is measured. The above workpiece holding device has a cylindrical space that opens vertically upward on the rotation axis of the workpiece and whose axis is the rotation axis of the workpiece. The cylindrical space described above is configured to accommodate a reference block for calibrating the position of the rotation axis of the workpiece in the workpiece holding device. The gear measuring machine comprises a reference block which is inserted into the cylindrical space and fixed to a rotating part provided in the workpiece holding device, the central axis of the inner surface of the reference block is coaxial with the rotation axis of the rotating part, and the probe is configured to contact the inner surface of the cylindrical member when calibrating the position of the rotation axis of the workpiece.

2. The gear measuring machine according to claim 1, wherein the probe is configured to contact the workpiece by moving vertically downward toward the workpiece from vertically above the workpiece when the measuring device mounting portion is located at the measuring position.

3. The gear measuring machine according to claim 1 or 2, wherein the moving mechanism includes a pair of guide rails provided on the upper surface of the bed, and a drive device that moves the measuring device mounting portion, which is placed on the pair of guide rails, back and forth between the measuring position and the retracted position along the pair of guide rails.

4. The bed has a recess that is vertically recessed downward from the upper surface of the bed, at a position vertically below the probe when the measuring device mounting portion is in the measuring position. The gear measuring machine according to claim 1 or 2, wherein the workpiece holding device is provided in the recess and has a rotation mechanism for rotating the held workpiece about a vertical axis.

5. The bed has a recess that is recessed vertically downward from the upper surface of the bed, at a position vertically below the probe when the measuring device mounting portion is in the measuring position, and between the pair of guide rails. The gear measuring machine according to claim 3, wherein the workpiece holding device is provided in the recess and has a rotation mechanism for rotating the held workpiece about a vertical axis.

6. The gear measuring machine according to claim 5, wherein the measuring device mounting portion has a flat surface located vertically below the part to which the measuring device is attached, and the end on the workpiece holding device side of the flat surface has multiple arcs that are continuously curved in a wave-like manner, and has a through hole located inward from the end that has a portion that conforms to the shape of the end.

7. The gear measuring machine according to claim 1 or 2, further comprising a measurement result transmission unit that transmits the measurement results from the above measuring device to at least one processing device included in the above processing line.

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