JPS5842402B2 - Measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring device for precisely measuring the inner diameter or outer diameter of an object to be measured, and in particular to a measuring device that can measure various dimensions over a wide range by moving two stylus probes to bring them into contact with the object. This invention relates to a two-needle type measuring device.

In conventional wide-range measuring devices, the stylus and measuring head are slidable relative to the main body, and are moved by a feed screw.

Therefore, the moving state 6 of the stylus and measuring head is controlled by the shape of the sliding surface, and the degree of inclination varies depending on the location, resulting in a disadvantage that the measured values include irregular errors.

In view of the above-mentioned drawbacks, the present invention combines two levers between a pair of measuring heads in an X-shape, arranges the tips of the levers of equal length to engage with both sides of the pair of measuring heads, and A device that eliminates measurement errors by rotating a lever around the intersection of an X-shape and converting the amount of rotation into the amount of linear movement of a pair of measuring heads, so that the measuring heads are always moved in parallel regardless of changes in the shape of the guide rail. It is.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention for measuring an inner diameter will be described below with reference to the drawings.

Reference numeral 1 denotes a main body of the measuring device supported by a support 2, and has parallel guide rails 3, 3' that continuously protrude over the entire length in the longitudinal direction on both upper and lower surfaces.

Reference numeral 4 denotes a rotating shaft which penetrates the main body 1 at the center of the main body 1 and projects from the main body 1 on both sides at right angles to the longitudinal direction, and is journalled; 5 is attached to one end of the rotating shaft 4 with a key. It is a louver that is attached to the rotary shaft 4 and has arms extending from the mounting part to both sides at right angles to the axis of the rotation shaft 4.

60-1 A pin 7 is fixed to both ends of the louver 5 at the same distance from the center of the mounting part and protrudes toward the main body 1 side parallel to the rotation axis 4, and 7 is attached to the pin 6 so as to be rotatable only. The rollers for each pin have the same diameter.

8 is a first gear keyed to the other end of the rotating shaft 4; 9 is located between the first gear 8 and the main body 1 and is rotatable with respect to the rotating shaft 4; The second gear 10 has the same shape as the second louver, and has the same pin 6'' and roller 7' as the pin 6 and roller 1 at the same distance from the center of the mounting part as the second louver. , a second lever fixed to the boss portion of the second gear 9 in a state facing the second lever 5, and the second lever and the second lever are point symmetrical with respect to the center of the kite rails 3, 3; Six sets are arranged in an X-shape.

11 (1) A pinion that meshes with the first gear 8 and is rotatably supported by a bracket 12 fixed to the main body 1, and this pinion shaft is connected to a drive source (not shown) and can be rotated reversibly. It is.

Reference numeral 13 denotes a stepped gear consisting of two gears, a gear 14 meshing with the second gear 9 and a gear 15 meshing with the pinion 11, and is supported by a pin 16 implanted in the bracket 12.

The gears are meshed with such a number of teeth that when the pinion 11 is rotated, the first lever 5 and the second lever 10 are rotated by the same angle in opposite directions.

For example, the pinion 11 has 20 teeth. The first gear 8 has 80 teeth.
, the second gear 9 has 100 teeth. The gear 14 has 50 teeth, and the gear 15 has 40 teeth, and when the pinion 11 is rotated one turn to the right, the first gear 8 rotates 174 times to the left, and the lever 5 rotates 174 times to the left.

Also, since the gear 15 rotates 1/2 to the left, the gear 14 also rotates 172 to the left, the second gear 9 rotates 1/4 to the right, and the second lever 10 rotates 1/4 to the right.

17G! the first lever 5 spaced apart on the main body 1;
A pair of measuring heads are disposed with the second lever 10 in between, and are in contact with the roller 7.7'' over the range of movement when the X-shaped lever rotates parallel to the opposing inner surfaces. It has the size of

Reference numeral 18 denotes a roller supported by a pin 19 installed in the measuring head so as to rotate in contact with the upper and lower top surfaces of the guide rails 3 and 3 when the measuring head 17 moves. They are provided one by one.

20 (1) When the measurement head is moved, the guide rail 3
, 3'' and is rotatably supported by a pin 21 installed in the measuring head.

Reference numeral 22 denotes two tension springs stretched between the pair of measuring heads on the outside of the rollers 18 provided above and below, which bias the pair of measuring heads to approach each other. The mutually facing inner surfaces of the measuring heads are always brought into contact with said rollers 7,T.

Rotation of the two levers moves the pair of measurement heads the same distance in opposite directions.

Reference numeral 23 denotes a holding stand attached to the lower surface of one of the pair of measurement heads for holding a length measuring device 24 for measuring the dimensions of the object to be measured.

For example, Inductosin (trade name) is used as the length measuring device, and the scale 25 of Inductosin is held on the holding table 23 in parallel with the longitudinal direction of the main body 1.

Reference numeral 26 denotes a stand attached to the lower surface of the other of the pair of measuring heads, and holds the slider 27 of the inductosyn.

28 (l) A measuring element of an electric micrometer is attached to the lower surface of the holding table 23 via a support plate 29 with the stylus facing downward; The probes of the electric micrometers are mounted facing downward, and the tips of the probes of these two electric micrometers move on the same straight line when the pair of measuring heads move, and the indicated value of inductosin is The stylus is installed so that the distance between the stylus and the two stylus are the same.

Further, it is connected to the electric micrometer body so that the displacement Ij of the two stylus probes can be measured in the direction of movement of the measuring head, and the amount of displacement can be read.

and the readings of the inductosin as well as the electric micrometer (1), which are connected to a control device in a known manner.

Next, the effect will be explained.

First, the adjustment procedure will be described.

An inner diameter gauge with known dimensions within a measurable range is prepared and placed at a measurement position, and the known dimensions of the gauge are given as a command value to a control device (not shown).

The control device compares the command value with the value sent from the inductosyn, and gives a rotation instruction to the drive source M (not shown) until they match.

With this instruction, for example, the pinion 11 is moved in the direction of the arrow in FIG.
When is rotated, the rotation of the pinion 11 causes the first gear 8,
The first lever 5 is rotated clockwise in FIG. 1 via the rotation shaft 4, and at the same time, the second lever 10 is rotated by the same angle in the counterclockwise direction opposite to the first lever via the second gear 9 of the gear 13. .

As the first lever 5 and second lever 10 rotate in opposite directions, the X-shape becomes horizontally elongated and the roller 7 provided at one end of each lever becomes horizontally elongated.
A pair of measurement heads 1T sandwiching 7'' in parallel are simultaneously moved in a straight line by an equal distance S in a direction away from each other.

That is, the amount of rotation of the lever is converted into the amount of linear movement of the measuring head.

Then, the linear movement amount of the pair of measuring heads 17 is continuously sent as a numerical value from the inductosin 24 to the control device.

If the numerical value indicating the command value matches the numerical value sent from the inductosin, the control device will no longer give a rotation instruction to the drive source, and the rotation of the drive source will stop.

At this time, either adjust the mounting position of the electric micrometer and the position of the stylus so that the two stylus contacts the inner surface of the gauge and the outputs of the two electric micrometers are both zero, or (
j Perform electrical zero adjustment.

In normal cases, this adjustment of the stylus using a gauge of known size is not necessary if it is performed for the first time, even if the measurement diameter of the object to be measured is changed.

Thereafter, in order to measure the inner diameter of the object to be measured, the support body 2 is moved by a well-known appropriate means, such as a positioning means using a numerical control device, so that the midpoint between the two stylus needles is positioned on the central axis of the inner diameter of the object to be measured. The two stylus needles are inserted into the inner diameter to be measured in unison.

Next, the control device instructs the drive source M to rotate, the pair of measuring heads move away from each other by an equal distance, and the control device receives the numerical values sent from the inductosin.
The drive source is stopped when the value matches the numerical value indicating the set value of the given inner diameter to be measured.

At this time, the amount of displacement of the two stylus contacts with the inner diameter surface of the object to be measured is sent to the control device as an output of the electric micrometer.

The sum of the outputs of these two electric micrometers is determined as the error between the target set value and the inner diameter to be measured.

The above description has been made regarding an embodiment for measuring the inner diameter, but instead of a tension spring, a compression spring is used to change the direction of engagement between the end rollers of the two levers and the measuring head.

It is easy to use it for outer diameter measurement.

Furthermore, it is also possible to create an outer diameter/inner diameter measuring device by removing the tension spring and providing grooves in the measuring head to receive the end rollers of the two levers.

In addition, although the probe of an electric micrometer was attached to the lower end of the pair of measurement heads and brought into contact with the object to be measured, it is also possible to use a ground displacement detector such as an air micrometer instead of the electric micrometer. It is possible.

Further, as a length measuring device, it is also possible to use a device that uses moiré fringes or a magnetic scale.

As detailed above, in the present invention, two levers of the same shape are combined in an X-shape and rotated at the same angle in opposite directions at the same time, and the rollers at the tips of these levers are always aligned with the measuring surface of a pair of measuring heads. Since the levers are in contact with each other so that the amount of rotational movement of the lever is interpreted as the amount of linear movement of the measuring head, the pair of measuring heads can always move in parallel even if the top and bottom apexes of the guide rails are not strictly straight lines.

Furthermore, even if the guide rail is inclined and the pair of measuring heads move relative to each other in the vertical direction, the scale of the inductosin is held by only one measuring head, so no errors occur in the measured values.

Furthermore, in a measuring device where the pair of measuring heads are not always parallel, if one of the pair of measuring heads C'i is tilted, the tilt will have a large effect on the measurement error depending on the distance between the scale installation position and the tip of the stylus. However, in the present invention, since the pair of measuring heads are always parallel, when tilting, the pair of measuring heads both tilt at the same angle, so the tilt does not greatly affect the measurement error.

Furthermore, since rollers are used for the pair of measuring head moving parts, there is little heat generation and less deterioration in measurement accuracy.

In addition, the roller of the lever for moving the pair of measuring heads is structured so that it contacts the inner surface of the measuring head at a point symmetrical to the center of the guide rail. It does not cause any strain.

Furthermore, since it is a two-needle type and the two needles are brought into contact with the inner diameter to be measured at the same time, measurements can be carried out in a short time.

It has many characteristics such as

[Brief explanation of drawings]

FIG. 1 is a schematic front view of the inner diameter measuring device according to the present invention, and FIG.
The figure is a sectional view taken along line I-II in figure 1, and figure 3 is a cross-sectional view taken along line II- in figure 1.
III sectional view, and FIG. 4 is a IV-IV perspective view of FIG. 1. 1... Main body, 3.3'-... Guide rail, 5... 1st lever, 8... 1st gear, 9... Second gear, 10...Second lever, 11...Pinion, 13...Step gear, 17...Measuring head, 24...
・Length measuring device, 28.30...Electric micrometer.

Claims (1)

[Claims] 1. A two-needle measuring device that measures the distance between two points on an object to be measured, which includes a guide rail that is attached to the main body and extends in a straight line, a pair of measurement heads that can directly move on the guide rail, and The arm is arranged in an X-shape between a pair of measuring heads, each end of the arm engages with each surface of the pair of measuring heads, and is rotatably supported by the guide rail at the intersection of the X-shape, and from the intersection. two levers having the same length of arms up to the end of which they engage with the measuring head; means for keeping each engaging end of the two levers in constant contact with each surface of the measuring head; and means for connecting the two levers to each other. a drive mechanism that rotates the same angle in opposite directions; a measuring device that measures the amount of linear movement of the measuring heads; a scale side and a reading side of the pair of measuring heads are respectively provided parallel to the moving direction of the measuring heads; and the pair of measuring heads; a detector fixed to each end of the length measuring device and having a needle portion that contacts between two corresponding points on the object to be measured, and detecting an error from a read value of the length measuring device; and an output signal of the length measuring device. A measuring device comprising: a control device that controls the first drive mechanism in response to the signal and inputs an output signal of the detector.