JPH0648163B2 - Automatic continuous measuring device for linear pitch - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic continuous measuring device for groove pitches of racks, screws, rack cutters, ball screws, etc. having linear grooves.

[Prior art and its problems] Generally, a length measuring machine, a universal measuring microscope, a tool microscope, etc. are used for measuring the pitch of, for example, a rack, a screw, a rack cutter, and a ball screw having a linear groove. .

Explaining the case where the pitch is measured with a tool microscope. First, select a V-shaped thin wire that matches the angle of the thread to be measured, tilt the microscope barrel in the direction of the screw lead angle, and place it between both sensors. The image of the thread groove of the attached object to be measured should be visible in the field of view of the microscope. After adjusting so that the line connecting the outer diameters of the screw threads matches the left and right sliding directions of the measuring machine table, slightly move the measuring machine table to the left and right and back and forth so that the V-shaped thin wire is correctly aligned with both flanges of the screw groove. , Read the left and right feed amount at that time. Next, the table to be measured is fed by one pitch with the object to be measured as it is, the screw groove is shown in the visual field, and the table is finely moved to the left and right and back and forth in the same manner as described above, so that the V-shaped thin wire is correctly aligned with both flanges of the screw groove. Read the left and right table feed amount at that time. When the reading is obtained by repeating this operation, those values are calculated to obtain the single pitch error and the cumulative pitch error.

On the other hand, when measuring the pitch with a universal measuring microscope, not only the same gauge as the above is used as the gauge to be used, but also a measuring gauge (pin-shaped) is brought into contact with both flanks. In all cases, such as reading the position of the engraved line outside the center or the position of the outer diameter line, or reading the position of the end face of the knife edge using the measuring knife edge, complete the reference line. Therefore, even an expert with a high degree of skill has a great deal of eye fatigue due to one-point gaze, and many of them must continuously measure a large number of DUTs. Those requiring a long measurement time require severe work both mentally and physically, and it cannot be expected to reduce the measurement time and data processing time.

An object of the present invention is to set two contact measuring elements at a predetermined pitch interval, to perform an intermittent feed operation at the same pitch as the object to be measured, and to bring both contact measuring elements into pressure contact with the measuring point of the object to be measured. A device capable of electrically solving the problem of the prior art by electrically detecting the difference between the indicated values when the output is made and displaying and recording as a single pitch error continuously for each pitch is provided. It is something to do.

[Means for Solving the Problems] A configuration of the present invention for solving the problems of the prior art is such that an object to be measured is set on one side of the upper part of the machine body in an exchangeable manner, and the machine body has an indexing gear structure, and , A Geneva mechanism or the like is provided with a base that intermittently moves in parallel with the axis of the object to be measured at a pitch that matches the design pitch of the object to be measured, and on the base, in the direction orthogonal to the intermittent movement direction. It is movable by a cam 9a, and mounts a pedestal 7 that is biased in one direction by the action of a spring, and is movable on the pedestal 7 by a cam 9b in a direction orthogonal to the pedestal 7, Moreover, the pedestal 8 urged in one direction by the action of the spring is placed on the pedestal, while the detection base is provided on the pedestal 8, and
On this detection base, there is provided a surface plate 30 that can be adjusted and moved in the same direction as the moving direction of the pedestal 7, and on the surface plate 30, a slide that can be adjusted and moved in the same direction as the moving direction of the pedestal 8. Mount the board 32, in front of the surface plate 30 and the slide plate 32,
The levers 35 and 36, each of which has a replaceable contact tip 34 which can intervene in the groove of the object to be measured, are exchangeably provided at the tips, and the surface plate 30 and the platen 30 are attached to the rear ends of the levers 35 and 36, respectively. The detectors of the detectors provided separately on the slide board 32 were pressed into contact with each other, and both the detectors were electrically connected to an indicator having an arithmetic unit, and further, the indicator was electrically connected to a recorder. Embodiments Next, details of embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing an outline of the entire apparatus, FIG. 2 is an explanatory view of main parts, FIG. 3 is a partially cutaway side view of the same as above, and FIG. The figure shows a partially cutaway front view of the same as above, FIG. 6 is a plan view of the automatic return structure of the measurement pedestal, FIG. 7 is a side view of the measurement drive camshaft, FIG. 8 is a front view of the same, and FIG. 9 is a plan view of the same. Figures 10a to 10f are flow charts showing the movement of the measurement pedestal and the movement of the contact probe in response to the movement of the measurement drive cam shaft, and Figures 11a to 11f are the objects to be measured of the present invention. Partial front view, 12 a, b, 3 a, b, 14 a,
3B is a side view and a front view, respectively, showing the types of contact probes.

1 shown in FIG. 1 is an airframe, and an upper part of the airframe 1 is
By an indexing gear structure (not shown) and a Geneva mechanism (not shown), intermittent feeding is performed in the direction of the arrow at a pitch that matches the design pitch of the DUT 2, and returning from the end to the start is possible. A measuring device A capable of being mounted is mounted. The DUT 2 is parallel to the moving direction of the measuring apparatus A
Attached to one side. In the figure, 3 is an indicator having an arithmetic unit, and 4 is a recorder electrically connected to the indicator 3.

Next, the details of the measuring apparatus A of the present invention will be described with reference to FIGS. 2 to 9. Reference numeral 5 in FIG. 3 is provided at a predetermined pitch along the guide rail 6 provided along the longitudinal direction of the machine body 1. A pedestal 7 which is intermittently moved, on which is mounted a pedestal 7 which is movable along the intermittent movement direction of the pedestal 5, that is, the X coordinate direction. On the pedestal 7, a direction orthogonal to the intermittent movement direction of the base 5,
That is, the pedestal 8 movable along the Y coordinate direction is mounted. The movement of the pedestal 7 in the X coordinate direction and the movement of the pedestal 8 in the Y coordinate direction are performed by a cam 9a provided on the measurement drive cam shaft 9 shown in FIGS. 3, 5, 7, 8, and 9. , 9b, FIG. 3 shows the moving mechanism of the pedestal 7 in the X coordinate direction, and FIG. 5 shows the moving mechanism of the pedestal 8 in the Y coordinate direction.

First, the structure of the measurement drive cam shaft 9 will be described. As is clear from FIGS.
A circular cam 9a having a circular planar shape, which is largely deviated from the central axis of the measurement drive cam shaft 9, is provided on the upper part of the same, and the upper surface of the cam 9a is the same as the central axis of the measurement drive cam shaft 9. A cam 9b having a flat cam portion 9c with a part cut off on the axis and having a diameter substantially the same as that of the measurement drive cam shaft 9 is integrally formed. The cam 9a acts on the pedestal 7 and the cam 9b acts on the pedestal 8 separately.
9b has the following specific configuration conditions. That is, as shown in FIG. 9, the surface of the flat cam portion 9c formed on the cam 9b is parallel to the line connecting the center of the measurement drive cam shaft 9 and the center of the cam 9a. , And the flat cam portion 9c of the cam 9b is, for example, 1.5 mm from the center of the cam 9b.
It is provided at a position displaced by mm, and this displacement controls smooth movement of the cam 9b. The measurement drive cam shaft 9 is mounted on the base 5 as shown in FIGS.
A bevel gear 10 is provided at the lower end of the measurement drive cam shaft 9 while being rotatably supported with respect to the bevel gear 10.
A bevel gear 12 provided on the drive shaft 11 is meshed with the drive shaft 11 so that the drive of a motor (not shown) provided on the machine body 1 is transmitted. Also, as shown in FIG. 3, the cam 9a is
The flat surface of the working plate 13 provided on the pedestal 7 is brought into contact with the cam 9b, and the end surface of the working plate 14 provided on the pedestal 8 is brought into contact with the cam 9b, as shown in FIG. The above cams 9a, 9
The b and the working plates 13 and 14 are made of a super hard steel material such as stainless steel. Further, reference numeral 15 in FIG. 3 denotes a cradle on which the DUT 2 is set, and the pedestal 15 can be replaced with a cradle suitable for the size of the pitch of the DUT 2. 16 is a bolt for retaining the DUT 2.

Next, reference numerals 17 and 18 shown in FIG. 4 denote mounting pieces provided on two left and right sides of one side of the pedestal 7, that is, one side (parallel to the X coordinate direction) orthogonal to the intermittent movement direction of the base 5. Then, a stroke restricting bolt 19 is provided on the mounting piece 17 on the left side of the paper so as to be adjustable forward and backward, and a bolt 20 is mounted on the mounting piece 18 on the right side of the paper so as to be adjustable forward and backward. Then, both mounting pieces 17,1
A spring support piece 21 fixed to the side surface of the base 5 is interposed in the middle of 8, and the pedestal 7 is placed between the spring support piece 21 and the bolt 20 of the attachment piece 18 to be measured. A spiral spring 22 that urges in the direction opposite to 2 is installed. 21a in the figure is
It is a stopper that comes into contact with the one bolt 19 described above.

Also, as shown in FIG. 6, mounting pieces 23, 24 are fixed to the front surface of the pedestal 8 in the same manner as described above.
Bolts 25 and 26 are screwed into 4 respectively, and the above-mentioned mounting pieces 23 and 24
The spring support piece 27 fixed to the pedestal 7 is interposed in the middle of
A spiral spring 28 for elastically urging the pedestal 8 in the direction opposite to the intermittent movement direction of the base 5 is elastically provided between the spring support piece 27 and the bolt 26 of the one mounting piece 24. 27a in the figure
Is a stopper that comes into contact with the bolt 25.

Next, the main part of the measuring apparatus A of the present invention will be described with reference to FIGS.

Reference numeral 29 denotes a detection base fixed on the pedestal 8 and having a rectangular planar shape. The detection base 29 is moved by the above-mentioned cam mechanism in the X and Y coordinate directions via the pedestals 7 and 8. is there. A surface plate 30 is mounted on the detection table 29, and one surface of the surface plate 30 is finely adjusted only in the X coordinate direction and is provided on the detection table 29. The adjusting bolt 31 is screwed. Further, as is clear from FIG. 5, a slide plate 32 that is movable only in the Y coordinate direction is provided on the surface plate 30. One side of this slide plate 32 is
An adjusting bolt 33 provided on the surface plate 30 is screwed, and by rotating the adjusting bolt 33, the slide plate 32 can be finely adjusted and moved in the Y coordinate direction with respect to the surface plate 30. It was done.

As is clear from FIGS. 4 and 5, the front part of the surface plate 30 and the front part of the slide plate 32 can intervene in the pitch groove of the DUT 2 respectively. Attached are levers 35 and 36 to which a contact probe 34 as shown in FIG. The surface plate 30 of the levers 35 and 36,
Explaining the mounting structure for the slide board 32, the support pieces 37, 38 in which projections 37a, 38a each having a plane shape of an isosceles right triangle are projected rearward on the front upper and lower surfaces of both levers 35, 36 are described.
Are fixed vertically symmetrically. On the other hand, in the rear of the support pieces 37, 38, the support pieces 39, 40 are provided with projections 39a, 40a having a plane shape of an isosceles right triangle facing the projections 37a, 38a of the support pieces 37, 38 in a forward direction. The support pieces 39, 40 are arranged above and below the levers 35, 36, and one support piece
39 is fixed on the surface plate 30, and the other support piece 40 is fixed on the slide plate 32. Then, the leaf springs 41, 42 are attached in an X shape between the slopes of the protrusions 37a, 38a, 39a, 40a facing each other of the supporting pieces 37, 38, 39, 40 facing each other.
The levers 35 and 36 can be swung about an intersection of 1,42 as an axis, which is a so-called non-axial support structure.

At the rear ends of the levers 35 and 36, the detectors 43a and 44 of the detectors 43 and 44 mounted separately on the surface plate 30 and the slide plate 32, respectively.
a is pressed. This detector 43a, 44a is a detector 43,4
It is biased against rotation with respect to 4, and this rotation bias is normally blocked by the levers 35 and 36, and the detectors 43a and 44a follow the rotation of the levers 35 and 36. The motion is converted into an electric signal, and each of the above detectors 4
3,44 are respectively connected to the arithmetic units of the above-mentioned indicator 3 respectively. In the figure, 45 and 46 are return springs for the levers 35 and 36.

The types of the DUT 2 include those shown in FIGS. 11 a to 11 i, in which a and g are racks, b, d,
And, e is a positioning gauge, c is a drawing, h is a blade such as a rack cutter, f is a screw, and i is a ball screw. P is the pitch.

[Description of Operation] The operation of the present invention will be described based on the above-described embodiment.

First, as a preparatory action, as shown in FIG. 1, the DUT 2 is set on a pedestal 15 provided on one side of the machine body 1 and is fixed with bolts 16. On the other hand, a pitch gauge (not shown) set to the pitch of the object to be measured 2 is fixed, and one of the contact gauges 34 fixed to the surface plate 30 at one end of the pitch gauge is brought into contact with the pitch gauge. The indicator based on the signal input to the arithmetic unit of the indicator 3 is set to 0. Next, the slide board 32 is moved in the Y-coordinate direction by the action of the adjusting bolt 33 to bring the other contact probe 34 into contact with the other end of the pitch gauge, and an instruction is given by a signal input to the arithmetic unit via the detector 43. Set the position where the total shows 0. Further, according to the pitch of the object 2 to be measured, the surface plate 30 is moved back and forth by the adjusting bolt 31, and both contact measuring elements 34 are set in the middle of the groove at the starting end of the object 2 to be prepared.

Next, the flow of pitch measurement will be described with reference to FIGS. 10A to 10F. FIG. 10A shows a state in which the measurement apparatus A is sent in the 1-coordinate Y-coordinate direction at the start of measurement or after the pitch measurement at a certain point is completed. Is shown. At this time, the longest eccentric part of the cam 9a is in contact with the flat part of the working plate 13 provided on the pedestal 7, and the center of the arc portion of the cam 9b is the working plate provided on the pedestal 8.
The flat cam portion 9c of the cam 9b is in contact with the surface 14 and is parallel to the flat surface of the working plate. In this state, when the measurement drive cam shaft 9, that is, the cams 9a and 9b rotate, the pedestal 7,
That is, both contact measuring elements 34 move forward in the X-coordinate direction, and as shown in FIG. 2B, both contact measuring elements 34 individually intervene in the central portion of the groove of the DUT 2 adjacent to each other, and the eccentricity of the cam 9a is increased. Stops at 0. When the rotation is further continued, the pedestal 8 moves in the Y coordinate direction until the flat surface portion of the action plate 14 contacts the flat surface cam portion 9c of the cam 9b. That is, as shown in FIG. C, both contact measuring elements 34 intervening in the groove traverse from the position of the imaginary line to the position of the solid line, and the tip edge portions of both contact measuring elements 34 are, for example, of the DUT 2. The rack teeth are pressed against each other in the vicinity of the pitch line.

When both contact probes 34 are pressed into the vicinity of the pitch line of the rack teeth, the levers 35 and 36 have a leaf spring with a non-axial support structure.
It swings around the intersection of 41 and 42. The rotation of both levers 35 and 36 will rotate the detectors 43a and 44a.
An electric signal corresponding to the amount of rotation of the detectors 43a, 44a is generated at 3, 44, and the detection signals of both detectors 43, 44 are input to the arithmetic unit of the indicator 3, where both input signals are compared. The difference between the two signals is calculated and displayed on the indicator 3 and simultaneously printed on the recording paper 4a of the recorder 4. This measurement is performed until the cam 9b rotates from the state shown in c and the contact probe 34 in the pressure contact state is separated from the rack teeth until the pressure contact is released, as shown in FIG. Further, as the cams 9a and 9b continue to rotate, when the arc surface of the cam 9b comes into contact with the flat surface portion of the working plate 14 as shown in FIG. By the action of 9a, both contact measuring elements 34 are retracted to a position irrelevant to the DUT 2 by the movement of the pedestal 7 in the X coordinate direction.

Although the measurement of one pitch is completed by the above, the measuring device A is intermittently moved at this point in the Y coordinate direction by a stroke adapted to the pitch of the DUT 2 by the index gear structure built in the machine body 1 and the Geneva mechanism. After being transferred, the state shown in FIG. After the measurement operation is performed until the end of the DUT 2, the drive of the device is stopped and the measurement device A
Return to the starting point. The quality of the DUT 2 is judged based on the data recorded on the recording paper of the recorder 4. Since the movement of the contact probe 34 is performed by combining the movements of the pedestals 7 and 8 in the X and Y coordinate directions, there is no linear or right angle movement as illustrated.

[Effects of the Invention] According to the configuration of the present invention as described above, the following effects can be obtained.

(a) Compared to the conventional technology, all pitches can be automatically and continuously performed without requiring skill, and measurement can be performed in a short time, and all measurement results are recorded, so that the judgment of pass / fail is accurate. It can be done quickly and quickly.

(b) The pedestal 7, in which the movement of the two parallel contact measuring elements in the X and Y coordinate directions moves in the X coordinate direction with respect to the base.
Is performed by the pedestal 8 that moves in the Y-coordinate direction and the cams 9a and 9b that act on the pedestals 7 and 8 separately, so that the mechanism can be simplified and the entire device can be made compact, and the contact probe It is possible to improve the accuracy of the movement of the, and to make accurate pitch measurement.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of the entire apparatus, FIG. 2 is an explanatory view of main parts, FIG. 3 is a partially cutaway side view of the same as above, and FIG. The figure shows a partially cutaway front view of the same as above, FIG. 6 is a plan view of the automatic return structure of the measurement pedestal, FIG. 7 is a side view of the measurement drive camshaft, FIG. 8 is a front view of the same, and FIG. 9 is a plan view of the same. Figures 10a to 10f are flow charts showing the movement of the measurement pedestal and the movement of the contact probe in response to the movement of the measurement drive cam shaft, and Figures 11a to 11f are the objects to be measured of the present invention. 12 a, b, 13 a, b, 14 a,
3B is a side view and a front view, respectively, showing the types of contact probes. 1 ... Airframe, 2 ... DUT, 3 ... Indicator, 4 ... Recorder, 5 ... Base, 6 ... Guide rail, 7 ... Pedestal,
8 ... Pedestal, 9 ... Measurement drive cam shaft, 9a, 9b ... Cam,
9c …… Plane cam part, 13, 14 …… Working plate, 15 …… Cradle, 1
7,18 …… Mounting piece, 19,20 …… Bolt, 21 …… Spring support piece, 22 …… Spiral spring, 23,24 …… Mounting piece, 25,26
...... Bolts, 27 ...... Spring support pieces, 28 ...... Spiral springs, 29 ...... Detection base, 30 ...... Surface plate, 31 ...... Adjustment bolts, 32
…… Slide board, 33 …… Adjustment bolt, 34 …… Contact probe, 35,36 …… Lever, 37,38 …… Supporting piece, 37a, 38a ……
… Protrusion, 39,40 …… Supporting piece, 39a, 40a …… Protrusion, 41,42
...... Leaf springs, 43,44 …… Detectors, 43a, 44a …… Detectors,
45,46 ...... Return spring.

Claims (1)

[Claims] 1. An object to be measured is set so as to be replaceable on one side of an upper part of the machine body, and the machine body is arranged at a pitch suitable for a designed pitch of the object to be measured by an indexing gear structure and a Geneva mechanism. A base that intermittently moves in parallel with the axis of the object to be measured is provided, and the base can be moved by a cam (9a) in a direction orthogonal to the intermittent movement direction of the base, and a unidirectional direction by the action of a spring. The pedestal (7) is urged on the pedestal, and the cam (9b) is movable on the pedestal (7) in the direction orthogonal to the pedestal (7), and one side is formed by the action of the spring. The pedestal (8) urged in the direction is mounted on the pedestal, while the detection base is provided on the pedestal (8), and the detection base is adjusted and moved in the same direction as the movement direction of the pedestal (7). A possible surface plate (30) is provided, and further on this surface plate (30),
A slide board (32) that can be adjusted and moved in the same direction as the movement direction of the pedestal (8) is mounted, and the surface plate (30) and the slide board (32) are mounted.
The levers (35) and (36), each of which has a replaceable contact probe (34) which can intervene in the groove of the object to be measured, are provided at the front of the lever, respectively. 35), (36) at the rear end,
The detectors of the detectors provided separately on the surface plate (30) and the slide plate (32) are brought into pressure contact with each other, and both detectors are electrically connected to an indicator having an arithmetic unit. An automatic continuous measuring device for a linear pitch, which is characterized in that the is electrically connected to a recorder.