JPH02168101A - Apparatus for automatic continuous measurement of linear pitch - Google Patents

Abstract

PURPOSE:To make it possible to measure the pitch of a rack, a ball screw or the like having a linear groove, automatically and continuously in a short time, by detecting electrically a difference between indication values obtained when two contact probes are pressed on measuring points of a substance to be measured. CONSTITUTION:A substance 2 to be measured is set on a support block 15 and fixed by bolts 16. When two contact probes 34 are pressed on points in the vicinity of a pitch line of rack teeth respectively, levers 35 and 36 shake around the intersecting point of leaf springs 41 and 42 having a formless pivot structure. Rotations of the two levers 35 and 36 are accompa nied by rotations of detectors 43a and 44a, electric signals corresponding to the amounts of rotations of the detectors 43a and 44a are generated in detecting devices 43 and 44, detection signals of the two detecting devices 43 and 44 are inputted to an arithmetic unit of an indica tor 3, the two input signals are subjected therein to a comparative operation, and a difference between the two signals is displayed in the indicator 3, while it is recorded on recording paper 4a of a recorder 4. After the above-mentioned measuring operation is executed to the final end of the substance 2 to be measured, the quality of the substance 2 to be measured is judged on the basis of data recorded on the recording paper 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic continuous measuring device for the groove pitch of a rack having a linear groove, a screw, a rack cutter, a ball screw, etc.

[Prior art and its issues] For example, racks with generally straight grooves.

Length measuring machines, universal measuring microscopes, tool microscopes, etc. are used to measure the pitch of screws, rack cudders, ball screws, etc.

To explain the case of measuring pitch using a tool microscope, first select a type thin wire that matches the angle of the screw thread to be measured, tilt the microscope tube in the direction of the lead angle of the screw, and insert the wire between both sensors. The image of the screw groove of the attached object to be measured is made visible in the field of view of the microscope. After adjusting so that the line connecting the outer diameter of the screw thread matches the left and right sliding direction of the measuring machine table, move the measuring machine table slightly back and forth 9 degrees to the left and right to make sure that the ■-shaped thin line correctly matches both flanges of the thread groove. , read the left and right feed amount at that time.

Next, leave the object to be measured as it is and move the table one pitch to bring the thread groove into view.Similarly to the above, the table is slightly moved back and forth 9 degrees to the left and right to align the ■-shaped thin wire correctly with both flanges of the thread groove. Read the table senders on the left and right at that time. When readings are obtained by repeating this operation, these values are added by +W to obtain the single pitch error and cumulative pitch error.

On the other hand, when measuring the pitch using a universal measuring microscope, the gauge used can of course be measured by the same means as mentioned above, but in addition, a measuring gauge (bottle-shaped one) can be brought into contact with both flanks. In any case, the reference line must be completely set when measuring the position of the marked line or outer diameter line that is above the center, or the position of the end face of the knife using a measuring knife. For this reason, even highly skilled people have to focus on one point, which causes significant eye fatigue, and some people continuously measure a large number of constant objects. , those that require a lot of measurement time require mentally and physically demanding work, and shortening of the measurement time and data processing time cannot be expected.

The purpose of the present invention is to set two contact probes at a predetermined pitch interval, feed them intermittently at the same pitch as the object to be measured, and press and contact both contact probes to the measurement point of the object to be measured. This device is capable of elegantly solving the problems of the prior art by automatically detecting the difference in the indicated value when the pitch is 71i, displaying and recording it as a single pitch error, and continuously performing the operation for each pitch. We aim to provide the following.

[Means for Solving the Problems] The configuration of the present invention that solves the problems of the prior art is that the object to be measured is set replaceably on the upper side of the machine body, and an indexing gear structure and an indexing gear structure are installed in the machine body. , the top 3 [! A base is provided that moves intermittently parallel to the axis of the object to be measured at a pitch that matches the designed pitch of the fixed object, and is movable by a cam 9a on the base in a direction perpendicular to the direction of the intermittent movement. , and the pedestal 7 which is biased in one direction by the action of the spring is placed on the pedestal 7.
A pedestal 8 movable by a cam 9b in a direction perpendicular to the pedestal 7 and biased in one direction by the action of a spring is placed on top of the pedestal 8, and a detection pedestal is provided on the pedestal 8. At the same time, a surface plate 30 that can be adjusted and moved in the same direction as the movement direction of the pedestal 7 is provided on this detection table, and further, a surface plate 30 is provided on this surface plate 30 in the same direction as the movement direction of the pedestal 8: J8
A ride plate 32 capable of moving and rotating the joints is mounted on the surface plate 30 and the slide plate 32, each of which has a contact probe 34 at its tip that can be replaced at its tip to intervene in the groove of the object to be measured. The provided levers 35 and 36 are pivotally supported, and the detectors of the detectors separately provided on the surface plate 30 and the slide jaw 32 are brought into pressure contact with the rear ends of the levers 35 and 36, and both the detectors are connected. In addition to being electrically connected to an indicator having a calculation unit,
[Embodiment] The indicator is electrically connected to a recorder [Embodiment] The details of the embodiment of the present invention will be explained with reference to the drawings.

Figure 1 is a plan view showing the outline of the entire sosatsu, Figure 2 is an explanatory diagram of the main parts, Figure 3 is a partially cutaway plan view of the main parts of the same, and Figure 4 is a partially cutaway plan view of the same. , No. 514 is a partially cutaway front view of the same as above, FIG. 6 is a plan view of the automatic return flawed part of the measurement pedestal, FIG. 7 is a side view of the measurement drive camshaft, FIG. 8 is a front view of the same as above, and FIG.
The figure is a plan view of the same as above.

Figures 10a to 11 are flowcharts showing the movement of the measuring pedestal and the movement of the contact probe in response to the movement of the measuring drive camshaft.
Figures a-i are partial front views of the object to be measured according to the present invention, and Figures 12a and b, Figures 3a and b, and Figures 14a and b respectively show the types of contact probes. They are a side view and a front view.

1 shown in FIG. 1 is a fuselage, and on the upper part of the fuselage l,
An index gear structure (not shown) and a Geneva mechanism (not shown) are used to intermittently send the object 2 in the direction of the arrow at a pitch that matches the design pitch of the object to be measured 2 and return it from the end to the start end. A measuring device A is installed. The object to be measured 2 is placed on the body of the machine parallel to the direction of movement toward the measuring device.
In the 6 figures attached to one side, 3 is an indicator having an arithmetic unit, and 4 is a recorder electrically connected to the indicator 3.

Next, to explain the details of the measuring device of the present invention with reference to FIGS. 2 to 9, 5 shown in FIG. This is a base that moves intermittently, and on this base 5 is mounted a pedestal 7 that is movable in the direction of the intermittent movement of the base 5, that is, along the X coordinate direction. On the pedestal 7, a direction perpendicular to the intermittent movement direction of the base 5,
That is, a pedestal 8 that is movable along the YFM [direction] is mounted. The movement of the pedestal 7 in the X coordinate direction and the movement of the pedestal 8 in the , 9
FIG. 3 shows a mechanism for moving the pedestal 7 in the X-coordinate direction, and FIG.
The figure shows a mechanism for moving in the X-coordinate direction.

First, to explain the structure of the measurement drive camshaft 9, as is clear from FIGS. A circular cam 9a is provided, and the cam 9a has a flat cam portion 9C partially cut out on the same axis as the central axis of the measurement drive cam shaft 9 on the upper surface of the cam 9a. A cam 9b having approximately the same diameter as the shaft 9 is integrally formed. The cam 9a is mounted on the pedestal 7.
b acts separately on the pedestal 8,
Both cams 9a and 9b have the following specific structural conditions. That is, the surface of the planar 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, as shown in FIG. , and the planar cam portion 9c of the cam 9b are provided at a position offset by, for example, 1.5 va from the center of the cam 9b, and this offset controls the smooth movement of the cam 9b. The measurement drive camshaft 9 is the third
, 5, the measuring drive camshaft 9 is rotatably supported on the base 5, and a bevel gear 10 is provided at the lower end of the measurement drive camshaft 9, with which the bevel gear 12 is meshed. The drive of a motor (not shown) provided in the body 1 is transmitted thereto. Also, as shown in Figure 3,
The cam 9a has a flat surface of the action plate 13 provided on the pedestal 7.
Further, as shown in FIG. 5, a flat surface of an action plate 14 provided on the pedestal 8 comes into contact with the cam 9b. Note that the cams 9a, 9b and the action plate 13.1
4 is made of a cemented carbide material such as stainless steel. Further, reference numeral 15 in FIG. 3 is a pedestal on which the object 2 to be measured is set, and this pedestal 15 can be replaced with one more suitable for the pitch of the object 2 to be measured. 16 is a bolt for holding the object 2 to be measured.

Next, +7 and 18 shown in FIG.
Mounting pieces are provided at two places on the left and right (parallel to the rrats direction), and the mounting piece 17 on the left side of the page has a pole for stroke regulation.
+9 can be adjusted forward and backward, and the mounting piece 1 on the right side of the page
Attached to 8 is a pole 20 that can be adjusted forward and backward. A spring support piece 21 fixed to the side surface of the base 5 is interposed between the mounting pieces 17 and 18, and a spring support piece 21 is interposed between the spring support piece 2I and the bolt 20 of the mounting piece 18. , pedestal 7
21a in the figure is a spiral spring 22 that urges the object to be measured 2 in the opposite direction.
This is a stopper that comes into contact with 9.

Further, as shown in FIG. 6, mounting pieces 23 and 24 are fixed to the front surface of the pedestal 8 in the same manner as above, and poles 25 and 26 are screwed into these mounting pieces 23 and 24, respectively. ,
A spring support piece 27 fixed to the pedestal 7 is interposed between the mounting pieces 23 and 24, and the pedestal 8 is always mounted between the spring support piece 27 and the bolt 26 of one of the mounting pieces 24. A spiral spring 28 for urging in the opposite direction to the intermittent movement direction of 5 is elastically installed. In the figure, 27a is a stopper that comes into contact with the bolt 25.

Next, the main parts of the measurement station A of the present invention will be explained with reference to FIGS. 2 to 5.

Reference numeral 29 denotes a detection table having a rectangular planar shape fixed on the pedestal 8, and this detection table 29 is moved in the X and Y coordinate directions via the pedestals 7 and 8 by the above-mentioned cam mechanism. be. Further, a surface plate 30 is mounted on this detection table 29, and on one side of this surface plate 30, fine adjustment is made only in the X coordinate direction, and a surface plate 30 is mounted on the detection table 29. The adjustment port 31 is screwed together. Furthermore, as is clear from FIG. 5, a slide plate 32 is provided on the surface plate 30 and is movable only in the Y coordinate direction. An adjustment bolt 33 provided at 30 is screwed together, and by rotating the adjustment bolt 33, the slide plate 32 can be finely adjusted in the Y coordinate direction relative to the surface plate 30. A fourth,
As is clear from FIG. 5, the object to be measured 2 is mounted on the front part of the surface plate 30 and the front part of the slide plate 32, respectively.
A lever 35 is detachably attached with a contact probe 34 as shown in FIGS. 12 to 14 which intervenes in the pitch groove of the lever 35.
．． 36 is attached. The above-mentioned surface plate 30 of both levers 35 and 36. To explain the structure of the attachment to the slide board 32, the front upper and lower surfaces of both levers 35 and 36 have protrusions 37a and 38a having a planar shape of a right-angled isosceles triangle projecting backward. Fix vertically symmetrically. On the other hand, at the rear of the support pieces 37 and 38, there are projections 37a of the support pieces 37 and 38.

Support piece 39.40 having protrusions 39a and 40a protruding forward and having a right isosceles triangular planar shape opposite to 38a.
This support piece 39.40 is attached to the lever 35.3.
6, 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 opposing protrusions 37 of the opposing supporting pieces 37, 38, 39, 40
a.

A leaf spring 41.42 is attached in an X shape between the slopes of 38a, 39a, and 40a, and the lever 35.36 can swing around the intersection of the leaf springs 41.42. It has a shaft support structure.

Detectors 43a and 44a of detectors 43 and 44 respectively mounted on the surface plate 30 and slide plate 32 are pressed into contact with the rear ends of the levers 35 and 36, respectively. This detector 4
3a and 44a are rotatably biased with respect to the detector 43.44, and when this rotary bias is normal, the levers 35.36
This detector 43a is blocked by the detector 43a.

44a converts the movement that follows the rotation of the lever 35.36 into an electrical signal, and each of the above-mentioned detectors 43.4
4 are respectively connected to the arithmetic unit of the indicator 3. In the figure, reference numerals 45 and 46 indicate return springs for the levers 35 and 36.

The types of objects to be measured 2 include those shown in Figures 11 a-i, and figures a and g are racks b, d,
Figure e shows the positioning gauge.

Figures 0 and h show a cutting tool such as a rack cutter, figure f shows a screw, and figure 1 shows a ball screw. P is pitch.

[Description of operation] The present invention will be explained in detail based on the above embodiment. First, as a preparatory operation, as shown in FIG. , and fix with bolts 16. On the other hand, a pitch gauge (the path shown in the figure) set to the pitch of the object to be measured 2 is fixed, one end of the pitch gauge fixed to the surface plate 30 is brought into contact, and an instruction is given via the detector 43. Set the indicators to O based on the signals manually input to the three calculation units. Next, adjust bolt 33
The slide plate 32 is moved in the Y-coordinate direction ζ by the action of
3 to the position where the indicator shows 0 based on a signal input manually to the arithmetic unit. Further, the preparation is completed by moving the surface plate 30 back and forth using the adjusting bolt 31 according to the pitch of the object 2 to be measured, and setting both contact probes 34 in the middle of the groove at the starting end of the object 2 to be measured.

Next, the flow of To-Sochi measurement will be explained with reference to Fig. 10 a - f. Fig. a shows the starting point of measurement, or the end of pitch measurement at a certain point, and the measuring device tA is sent one pitch in the Y-coordinate direction. It shows the condition. At this time, cam 9
The longest eccentric part of a is in contact with the flat part of the action plate I3 provided on the pedestal 7, and the center of the arc of the cam 9b is in contact with the pedestal! The planar cam portion 9C of the cam 9b is in parallel with the plane of the action plate. In this state, when the measurement drive camshaft 9, that is, the cams 9a and 9b, rotates,
Due to the action of the cam 9a, the pedestal 7, that is, both contact probes 34
Navigating in the coordinate direction, as shown in figure b, both contact probes 34
The cams 9a intervene in the central portions of the grooves of the adjacent objects 2 to be measured, and the eccentricity of the cam 9a stops at the 00 point. As the rotation continues further, the base 8 moves in the X coordinate direction until the flat part of the action plate 14 comes into contact with the flat cam part 9C of the cam 9b. In other words, as shown in Figure 0, both contact probes 34 inserted into the groove
traverses from the position of the imaginary line to the position of the solid line, and the tip edge portions of both contact probes 34 are pressed against, for example, the vicinity of the pitch line of the rack teeth of the object to be measured 2, respectively.

When both contact probes 34 are pressed near the pitch line of each rack tooth, the levers 35 and 36 swing around the intersection of the leaf springs 41 and 42, which have a non-axis support structure. The rotation of the detectors 43a and 44a rotates the detectors 43a and 44a.

An electric signal corresponding to the amount of rotation of the detector 44a is generated, and the detection signals of both detectors 43 and 44 are input to the calculation unit of the indicator 3, where the two human power signals are compared and calculated, and the difference between the two signals is used as the indicator. 3 in total, and is simultaneously printed on the recording paper 4a of the recorder 4. As shown in Figure d, this measurement is performed until the cam 9b rotates from the state shown in Figure 0 and the contact probe 34 in the pressure contact state is separated from the rack teeth to release the pressure contact. As the cams 9a and 9b continue to rotate, the arcuate surface of the cam 9b comes into contact with the flat surface of the action plate 14, as shown in Fig. e, and both contact probes 34 are returned to the center of the groove, and the cams Due to the action of 9a, both contact probes 34 move back in the X-coordinate direction of the pedestal 7 to a position unrelated to the object to be measured 2.

This completes the measurement of one pitch, but at this point, the measuring device A is intermittently moved in the yia direction by the indexing gear structure built into the machine body 1 and the Geneva mechanism by a stroke that matches the pitch of the object to be measured 2. The state shown in figure a is reached. Then, perform the above measurement operation on the object to be measured 2I? After reaching the end, stop the drive of the device and turn off the measuring device A.
The quality of the object to be measured 2 is judged based on the data recorded on the recording paper of the recorder 4, which returns the object to the starting point. The movement of the contact probe 34 is based on the X and X positions of the bases 7 and 8.
Since it is performed by synthesizing movements in the coordinate direction, it does not move linearly or at right angles as shown.

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

(a) Compared to conventional technology, all pitches can be automatically and continuously measured without requiring any skill, and can be measured in a short time. All measurement results are recorded, so pass/fail judgments are accurate. and quickly.

(b) The movement of the two contact probes in the X and X coordinate directions causes the pedestal 7 to move in the X coordinate direction relative to the base, the pedestal 8 to move in the cams 9a acting on the cams 8 and 8 separately;

9b, the mechanism can be simplified and the entire device can be made more compact, and the accuracy of the movement of the contact probe can be improved, allowing accurate pitch measurement.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing the entire device, Fig. 2 is an explanatory view of the main parts, Fig. 3 is a partially cutaway side view of the main parts of the same, Fig. 4 is a partially cutaway plan view of the same, Fig. 5 The figure is a partially cutaway front view of the same as above, Fig. 6 is a plan view of the automatic return structure of the measuring pedestal, Fig. 7 is a side view of the measurement drive camshaft, Fig. 8 is a front view of the above, and Fig. 9 is a plan view of the same as above. Figures 10a to 10f are flowcharts showing the movement of the measuring pedestal and the movement of the contact probe in response to the movement of the measurement drive camshaft, and Figure 1I a = i is the object to be measured, which is the measurement target of the present invention. Partial front view of Figure 12 a, b, Figure 3 a, b
. FIGS. 14a and 14b are a side view and a front view, respectively, showing the types of contact probes. 1... Airframe, 2... Measured object, 3... Indicator, 4
... Recorder, 5... Base, 6... Guide rail,
7...Pedestal. 8...Pedestal, 9...Measuring drive camshaft, 9a, 9b
···cam. 9c... Planar cam part, 13.14... Action plate,
15... cradle, 17.18... mounting piece, 19.
20... Bolt, 21... Spring support piece, 22...
Spiral spring, 23.24...Mounting piece, 25.
26... Bolt, 27... Spring support piece, 28...
Spiral spring, 29... detection stand, 30... surface plate,
31...v41! Il bolt, 32...Slide plate, 33...Adjustment bolt, 34...Contact probe. 35.36... Lever, 37.38... Support piece,
37a, 38a...Protrusion, 39.40-...Support piece, 39a, 40a...=Protrusion, 41.42...
・Plate spring, 43.44...Detector, 43a, 44
a...Detector, 45.46...Return spring. Patent applicant Suzuki
Kim Hyungbuk Rihito
Yoshio Sano Figure (α) (b) Figure h'ji10 CC) (j) Q) (f) Figure (a) Figure (α) Figure 14 (alpha) d) Procedural amendment (method) % formula % "Figure 3" on page 18, line 19 is amended to read "Figure 13 March 29, 1999." Above Patent Application No. 324429 of 1988 2゜Name of the Invention Automatic Continuous Measuring Device for Linear Pitch 3゜Relationship with the Person Who Makes Correction

Claims (1)

[Claims] The object to be measured is replaceably set on one side of the upper part of the machine body, and the body is equipped with an indexing gear structure and a Geneva mechanism to provide a pitch that matches the designed pitch of the object to be measured. A base that moves intermittently in parallel with the axis of the object to be measured is provided, and is movable by a cam (9a) in a direction perpendicular to the direction of the intermittent movement of the base, and one side is moved by the action of a spring. While mounting the pedestal (7) biased in the direction,
A pedestal (8) is mounted on this pedestal (7), movable by a cam (9b) in a direction perpendicular to the pedestal (7), and biased in one direction by the action of a spring; On the other hand, a detection stand is provided on the pedestal (8), and a surface plate (30) adjustable and movable in the same direction as the movement direction of the pedestal (7) is provided on this detection stand, and furthermore, this surface plate (
30) A slide plate (32) that can be adjusted and moved in the same direction as the movement direction of the pedestal (8) is mounted on top of the surface plate (
30) and the front part of the slide board (32), there are separately levers (35) and (36) each having a replaceable contact probe (34) at its tip that can intervene in the groove of the object to be measured. The levers (35) and (36) are pivotally supported, and the detectors of the detectors separately provided on the surface plate (30) and the slide plate (32) are brought into pressure contact with the rear ends of the levers (35) and (36). 1. An automatic continuous measuring device for linear pitch, characterized in that the indicator is electrically connected to an indicator having an arithmetic unit, and the indicator is further electrically connected to a recorder.