JP3041141B2 - measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring an amount changing with a mechanical movement, and more particularly to a measuring device for measuring a change in an amount corresponding to a mechanical movement position.

[0002]

2. Description of the Related Art For example, O, such as a facsimile, a printer, etc.
The device A has a mechanism that involves a rotary motion and a linear motion. When measuring the amount associated with the movement of these mechanism units, since the movement modes are various, when measuring the amount due to the movement mode, it is necessary to repeat the measurement for each movement mode, and the measurement efficiency is low. There was a disadvantage of being low. For example,
After recording the measured amount obtained as the object moves, adjust the object based on the measurement result, re-measure, and check the change in characteristics before and after adjustment. It is necessary to record the data on a recording sheet each time it is performed, and to confirm the difference between the two.

[0003] Further, when the object to be measured involves a reciprocating motion, when confirming the difference between the measured amounts at the same place at the time of going forward and at the time of returning, after recording the measurement results in each case, the positions of both are measured. A troublesome procedure such as reversing the relationship and evaluating by overlapping the recording paper was required. As a power source for moving (moving) this mechanism, a stepping motor is often used because of its superiority in accuracy and control, and a mechanism that is rotated or linearly moved by the motor requires a motor. The above measurement is important when measuring the fluctuation of the load torque to be performed.

[0004]

As described above, as described above,
There is no measuring device that efficiently measures and displays the fluctuation of the load torque required for the object to be measured having a linear or rotary motion, for example, a stepping motor, based on the motion mode of the object to be measured. Therefore, it was inconvenient for designing the apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a measuring apparatus capable of easily observing a difference in a measured amount before and after adjustment of an object to be measured when measuring an amount accompanying movement.

[0006]

In order to solve the above-mentioned problems, a measuring apparatus according to the present invention comprises a measuring means for measuring an amount which changes with a reciprocating movement of a mechanism, and a plurality of means for displaying a measurement result by the measuring means. Display means having a screen, and control means for controlling the display of the measurement result on a plurality of screens of the display means so as to reverse the drawing direction of the display in accordance with the movement direction and display the result. It is composed.

[0007]

According to the present invention, for example, the same screen is divided into two parts, the measurement result obtained with the movement of the object to be measured is displayed and stored on one screen, and the stored screen is stored in a visible state, By displaying the measurement result obtained after the adjustment of the measured object on the other screen, the difference in the characteristics of the measured object before and after the adjustment can be easily visually recognized. When the object to be measured rotates continuously, for example, measurement and display are performed only while the object to be measured makes one rotation, and the screen is saved. Based on the measurement result, after adjusting the mechanical section of the measured object, remeasurement is performed, the measurement result is displayed on the other divided screen on the screen, and the measurement result before and after adjustment can be compared and examined on the same screen. To do. This enables a detailed examination of how the quantity accompanying the movement of the measured object has changed in relation to the rotation angle of the measured object.
When the object to be measured involves a reciprocating motion, one of the two divided screens displays the measurement result associated with the forward movement, the other screen displays the return measurement result, and the horizontal axis represents the forward movement. Is displayed inverted. Further, by displaying the measurement results at the same location of the mechanical position of the measured object at the time of going and returning on the plurality of screens, the observation is facilitated. In the exercise of each of the above aspects, in order to examine in detail the measurement amount at a specific place of the object to be moved, it is displayed after a predetermined time or distance has elapsed since the start of the movement of the object to be measured. To provide a means for arbitrarily expanding the scale of the display. In each measurement mode, the timing at which the external force is applied is introduced into the measuring device as an external signal in order to observe the influence of the external force acting on the measured object, and is displayed in parallel with each of the measured quantities.

As an example, when the load torque of a mechanism section driven by a stepping motor is measured as the measured quantity, when a predetermined load torque is applied to the stepping motor, as described later, the load flowing into the motor is reduced. The measurement is performed by utilizing the characteristic of the current waveform to be uniquely given with respect to the load torque. Generally, stepping motor application equipment is mass-produced. Therefore, since many motors having the same specification are used, if the relationship between the load torque and the current waveform characteristic is measured in advance for a typical motor, thereafter, in a real machine on which the motor having the same specification is mounted, Measure the characteristics of the current waveform flowing into the motor,
By comparing the previously measured load torque with the relationship between the current waveform characteristics, the load torque required by the actual machine mechanism can be easily obtained.

[0009]

Next, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, a case will be described in which a mechanism driven by a stepping motor measures a change in load torque required for the motor. FIG. 1 is a basic overall configuration diagram showing one embodiment of a measuring device according to the present invention. Each winding (bifile coil) ΦA of the stepping motor 1 (four-phase unipolar motor in this example),
One end of ΦA−, ΦB, ΦB− is connected to an external power supply VM applied via a connector 5, and the other end is connected to a switching transistor Q 1, Q
3, Q2 and Q4 are connected. The pulse supply to each winding is controlled by operating the switching transistors Q1 to Q4 at a predetermined timing, and the excitation is switched. The switching transistors Q1 to Q4 constitute a drive circuit 7 for driving a stepping motor.

The controller 9 includes an oscillating circuit for generating a clock serving as a reference for the pulse supply timing to the winding, a positioning circuit for determining the rotation angle (position) of the stepping motor, and the like. It generates a clockwise rotation clock CCW, an excitation mode signal, and the like. The distribution circuit 8 receives the clock CLK and the excitation mode signal, and supplies a pulse in the 2-2 phase excitation to each winding.

First, the reference load torque generator 3 is coupled via a coupling 4 to the output shaft of a stepping motor 1 as a master motor, which is a non-defective motor whose motor specifications have been determined, to change the torque. At this time, the motor drive voltage, the motor drive frequency, the excitation mode, the coil excitation switching switching transistor, and the accompanying coil back electromotive force absorption circuit (not shown) are specified. The coil current also changes in response to the torque change. However, in order to measure the coil current, the current detection unit 10 (in this example, inserted into the winding ΦB- ) To detect the coil current iB-. This coil current i
B− is amplified by the amplifier 11 and the terminal S of the switch 12 is
1 is supplied to the feature extraction unit 13. Feature extraction unit 1
The feature extraction in 3 extracts, for example, the feature of the torque-current waveform, and various information (parameters) are used as the feature. The basic torque measuring device as described above has already been proposed by the present inventors. For example,
See Japanese Patent Application Nos. 3-272018 and 3-290856.

FIG. 2 shows a waveform of a current flowing into an arbitrary phase of an HB type stepping motor when the stepping motor is driven at a constant voltage by 2-2 phase excitation. At the point of time when the current starts flowing into the phase (the current-phase current input point) t0, the current shows a negative value. Over time,
The current increases in the positive direction, and eventually shows a positive value. afterwards,
The current gradually increases. Here, when the load torque required for the motor is changed to 0, 1, 2, 3 Kg-cm as shown in the figure, the increasing tendency of the current changes. It can be seen that the current in the above section increases as the load torque increases. After the point in time when the current starts flowing into another phase other than the phase of interest (other-phase current input point) t1, the increasing tendency of the current becomes complicated, and the current does not always increase with an increase in the torque.

As described above, when the current value is integrated in a section between t0 and t1 of the current in FIG. 2 and in which the current is a positive value, as shown in FIG. It can be seen that there is a smooth relationship between the load torque TQ and the load torque TQ. However, the above relationship is reproduced for motors having the same specification, but cannot be compared between motors having different specifications. From this, when mass production is performed using a large number of motors of the same specification, the relationship between Q and TQ is calibrated once for a typical motor, and thereafter, the motor flows into the motor mounted on the actual machine. The load torque TQ can be measured by obtaining the Q from the current to be applied. As for the PM type motor, Q and TQ
Relationship can be determined.

FIG. 4 shows an example of an apparatus for rotating rollers by a stepping motor. The stepping motor 101 has a flange portion 102 fixed to a mounting plate 103 of a device by screws or the like. The motor 101
A gear 151 is fixed to the shaft 104. The gear 152 fitted to the gear 151 is
6, the roller 171 is rotated. Roller 171
Are fitted with the rollers 172, and both rotate with each other. It has been found that in an apparatus having such a mechanism, the load torque required for the motor significantly varies depending on the mutual assembly state of the parts. Further, for example, when paper is bitten between the two rollers, the load torque naturally increases. Further, when the roller has a knitting core, the load torque repeatedly fluctuates in synchronization with one rotation of the roller.

FIG. 5 is a diagram showing the relationship between a paper feed roller, a print head and a print carriage in a printer using the configuration shown in FIG. The power supplied from the stepping motor 101 is supplied to the roller 107 via the gear 151 and the gear 152. If the roller 107 and the slide 109 for sliding the print head 181 of the print carriage 108 are not parallel, the motor is required depending on where the print head 181 is located on the roller 107. The load torque fluctuates. Here, the slide 109 is rotatably held by bearings 111 and 113, and its inclination, parallelism, and the like are adjusted by adjusting screws 110 and 1.
12 is adjusted. In the drawing, 182 indicates a ribbon.

Further, in the mechanism shown in FIG. 5, the print carriage 1 is driven by another stepping motor (not shown).
08 repeats a reciprocating movement in the left-right direction. When the print carriage 108 is moved, the print head 181 is pressed against the roller 107 at a required timing by using another motor (not shown), thereby performing printing on the paper sandwiched between the print head 181 and the roller 107. During printing, the motor for moving the print carriage 108 while the print head 181 is being pressed against the roller 107 requires a larger load torque than when not printing. It is very important for such a mechanism to measure the change in torque according to the mode of motion in terms of device design.

FIG. 6 shows a conventional display example of the torque measurement data. In FIG. 6, the horizontal axis on one screen shows the cumulative number of pulses indicating the moving distance given to the test motor, and the vertical axis shows the magnitude of the load torque required for the test motor. In this example, when the measurement of the mechanism in FIG. 4 is performed, there is no problem in measuring the load torque itself. However, the load torque characteristic after the adjustment of the mechanism is performed based on the measurement result is described above. In order to compare with the value before the adjustment, it is necessary to record the above measurement result on a recording paper or the like in advance and compare it with a new measurement result.

Therefore, in this embodiment, a display as shown in FIG. 7 is performed instead of the display of FIG. Figure display screen, screen #
As shown as 1 and # 2, the upper and lower parts are divided into two parts, each having the same display function. Then, after one measurement result is drawn and displayed on either the screen # 1 or # 2, the screen is saved.

As shown in FIG. 7A, the result of measuring the load torque characteristic of the test device is drawn on screen # 1,
It is assumed that the load torque is biased with the rotation of the mechanism. Based on the result, the mounting relation of each part constituting the mechanical part is reviewed and adjusted. After the adjustment, re-measurement is performed, and the result is drawn on a screen # 2, whereby a display as shown in FIG. 7B is obtained. Since the load torque characteristic of the device under test before adjustment is stored in the screen # 1, by comparing this with the screen # 2, it is easy to confirm the result of the adjustment. When the measurement is performed again, the image may be drawn on the screen # 1.

When the measurement of the above embodiment is performed, the roller of the device to be measured may be continuously rotated. However, if the roller is controlled so as to make one complete rotation and stand still, a large load torque is required. This is convenient for accurately grasping the portion (the rotation angle from the reference position) and performing appropriate allowance. That is, the rotation angle of the continuously rotating measurement target can be limited.

When measuring a reciprocating measuring object such as the print carriage shown in FIG. 5, a display as shown in FIG. 8 is preferable. When the carriage of FIG. 5 is moving from left to right, as shown in FIG.
1 is performed from left to right, and the display is saved. When the forward measurement is completed and the return measurement is performed, the measurement result is drawn on screen # 2 from right to left as shown in FIG. 8B. In this way, by reversing the drawing direction between forward and backward, the operation of the mechanism to be measured is
It is easy to understand how the change occurs between the time of going and returning.

In the display example of FIG. 8, the carriage is
The horizontal axis of each of the upper and lower screens indicates the value at the same location on the slide shown in FIG.
The forward load torque characteristic drawn on the screen # 2 can be compared with the return load torque characteristic drawn on the screen # 2, and when the mechanism moves, the difference between the forward and return behaviors can be determined calmly. . This makes it possible to display the measured quantities relating to the same place at the time of going forward and at the time of returning. FIG. 9 shows a configuration of a measurement screen for observing the behavior of the measured object in more detail in the display example of FIG. FIG. 9 (A) shows FIG.
3 shows another example of the measurement shown in FIG. In the illustrated example, A-
It often happens that it is desired to measure the portion indicated by A 'in an enlarged manner. In this case, when the object to be measured starts moving from left to right, no measurement result is drawn yet.
When the measured object reaches the point A, drawing is started on the screen # 1 from left to right. When drawing, if necessary,
By enlarging in the horizontal axis direction, the observation target portion can be measured in detail. When the measured object starts moving from right to left, drawing is not performed until the measured object reaches point A '. Screen # 2 when point A 'is reached
Then, drawing is started from right to left.

The above display is not limited to the case of the reciprocal display shown in FIG. 9, but it is needless to say that the display can be applied to the case of the alternate display shown in FIG. In this manner, drawing can be started from a predetermined point of the moving object to be measured.

FIG. 10 shows how the load torque applied to the stepping motor for moving the carriage when printing is performed while the print carriage is moving on the slide in the mechanism shown in FIG. Is shown. In the lower part of FIG. 9, the timing at which the printing is performed is introduced from the device to be measured, and is displayed in parallel with the display of the load torque. As described above, the behavior of the object to be measured is measured and analyzed in detail by displaying the measured value and the data indicating the timing of applying an effect that may cause a variation in the measured value to the mechanism to be measured in parallel. It becomes possible.

Next, an embodiment in which the measuring apparatus according to the present invention is realized as a system to which a microcomputer is applied will be described in detail. FIG. 11 shows an embodiment of the above system. Microcomputer (CPU) on bus BUS
213, ROM 212, and RAM 211 are arranged in the same manner as in a normal system. In addition, the LCD / software switch drive unit 215 is controlled via an appropriate interface I / F 217 to drive the LCD / software switch unit 214 and the interface I / F 217.
A keyboard 216 is connected via F218 to form a man-machine interface. Thus, input of measurement conditions, instructions from the apparatus side, and display of measurement results are performed. Further, data can be exchanged with an external computer (personal computer) via the GP-IB interface section 222 or the RS232C interface 223. In addition, an FDD control unit 220 that controls the FDD 221 and an external interface 219 are connected to the bus. External interface 21
9, the external marker signal is introduced, and the display as shown in FIG. 10 is enabled on the display 18 of FIG.

Drive pulse generator 20 arranged on bus
From 6, a drive timing to the motor to be measured 200 is generated according to an instruction from the CPU 213. The driving circuit 201 for the unipolar motor or the driving circuit 202 for the bipolar motor is selectively used as necessary. The drive circuit receives power supply from the voltage variable power supply 205 and can be configured by transistors Q1 to Q4 and the like as in the example shown in FIG. The motor to be measured 20
0 is driven. In the drive circuit, as in the case of FIG. 1,
A current / voltage detecting means 207 using a resistor or the like is provided.
The instantaneous value of the detected current is converted into a digital value by an A / D converter at an appropriate sampling interval.
Under the control of the MA control unit 208, the data is sequentially stored in the RAM 211. The sampling is executed by starting A / D conversion in accordance with an instruction from a trigger generator arranged on the bus. Further, the trigger generator receives a synchronization pulse from the pulse generator in order to synchronize the timing of the sampling generated by the trigger generator with the timing of the motor drive pulse.

Prior to the measurement, under the control of the CPU 213, the reference torque setting device control section 209 is controlled, and the driving circuit 204 drives the reference torque setting device 203.
An appropriately set voltage is supplied to the drive circuit from a voltage variable power supply 205 arranged on a bus.

Next, a processing procedure for realizing each of the above-described embodiments will be described with reference to flowcharts. FIG.
6 is a flowchart showing a procedure for implementing alternate display shown in FIG. First, necessary display initialization and measurement initialization are performed (steps S1 and S2), and screen # 1 is designated as a drawing area (step S3). After the preparation for measurement is completed, the process waits until the start button is pressed (step S4). When the start button is pressed, the rotation of the motor to be measured is started (step S5), and the accumulated pulse number P is initialized to 0 (step S6). Subsequently, each time a pulse is applied to the motor to be measured, the load torque is measured (Step S8) while increasing the P by one (Step S7), and the horizontal axis becomes P on the designated screen. A measurement result is drawn at a corresponding position (step S9). The above operation is repeated until the cumulative pulse number P reaches the value Pn for one designated stroke (step S10).

When the measurement for one stroke is completed, the motor to be measured is stopped (step S11), and the screen on which the drawing is to be performed next is switched to # 2 (step S12). The data drawn on screen # 1 in the above drawing is a normal CRT,
Alternatively, the data is stored on a liquid crystal display in a usual manner. If the end of all the measurements is determined by the designation, the process is ended (step S13). If not all the measurements are completed, it is determined whether or not the measurement mode is set to the continuous measurement (step S14). . Here, if the continuous measurement is designated, the motor is continuously rotated again without checking the start button, and the measurement of the next step is started. If continuous measurement is not specified,
Wait until the start button is pressed again.

FIG. 13 is a flowchart showing a processing procedure for performing display suitable for the case where the object to be measured shown in FIG. 8 reciprocates. After performing initialization for display and measurement (steps S21 and S22), the display screen is displayed as #
1 (step S23), and the drawing direction is set to positive (C
W) (step S24). Specifically, when the cumulative pulse position P is designated, it is sufficient to set whether the position of P is counted from the left end or the right end of the screen. Then, the rotation direction of the motor is initialized to CW (step S25), and after the start button is pressed (step S26), the motor to be measured starts rotating in the designated direction (step S27), and the accumulated pulse number P Is initialized to 0 (step S28).

Next, every time a pulse is applied to the motor,
P is incremented by one (step S29). The load torque is measured (step S30), and a measurement result is drawn at a point designated by P on the screen (step S31). At this time,
As described above, the calculation of the position of P is changed depending on the drawing direction. Subsequently, P is a predetermined value P
It is determined whether or not n has been reached (step S32), and the measurement and drawing of the load torque are continued until Pn is reached. P is P
n, the motor is stopped (step S33), and the designation of the next screen to be drawn is switched (step S3).
4) The drawing direction and the direction in which the motor should be rotated are reversed (steps S35 and S36).

It is determined that all the measurements have been completed (step S3).
7) If the termination is instructed, the measurement is terminated. If the measurement end is not specified, it is determined whether or not the continuous measurement is specified (step S38). If the continuous measurement has not been designated, the process waits for the start button to be pressed again, and starts the measurement in which the process goes in the reverse direction. If the continuous measurement is designated, the measurement of the next step is started without determining whether the start button is pressed.

FIG. 14 is a flowchart for performing control to start drawing from a predetermined point shown in FIG. However, in this example, it is assumed that the drawing direction is always constant. First, initialization related to display and measurement is performed (steps S41 and S42), and a scale X and a bias X that determine P at which to start drawing are determined according to the screen magnification in the horizontal axis direction.
After determining 0 (steps S43 and S44), the process waits for the start button to be pressed (step S45).

When the start button is pressed, the test motor starts rotating (step S46), and the accumulated pulse number P is initialized to 0 (step S47). Each time a drive pulse is applied to the motor, P is increased by 1 (step S
48), the load torque is measured (step S49). P
Is determined whether or not is larger than a predetermined bias value X0 (step S50), and the drawing is not performed until the value of P reaches X0. If P exceeds X0, a value P1 on the horizontal axis for drawing on the screen is calculated (step S51).
P1 is obtained as a value obtained by multiplying the difference between P and X0 by the scale S. P1 is compared with XS (step S52). If P1 exceeds the horizontal axis width XS, no drawing is performed. If the value of P1 satisfies the above condition, drawing is performed at the designated point (step S53). The value of P is compared with a predetermined cumulative number of pulses Pn for one stroke (step S54), and the measurement is continued until P exceeds Pn. P
When P reaches Pn, the motor is stopped (step S5).
5) Terminate the measurement.

FIG. 15 is a flowchart for realizing the display of the measured value of the object to be measured at the same place at the time of going forward and at the time of returning as shown in FIG. First, the display and measurement are initialized (steps S61 and S62), and the scale S and the bias X0 are initialized (steps S63 and S64). The screen is designated (step S65), and the motor rotation direction is designated as CW (step S66). Wait until the start button is pressed (step S67),
The measurement of the stroke is started, and the motor is rotated in the designated direction (step S68). Subsequently, the rotation direction of the motor is determined (step S69), and the accumulated pulse number P is initialized to 0 only when the rotation direction is CW (step S70), but is initialized when the rotation direction is CCW. Absent.

Next, each time a pulse is applied to the motor, the motor rotates one step at a time in the designated direction. P
Is incremented by one (step S72) or decremented by one (step S72), respectively, depending on whether the rotation direction is the CW or CCW direction (step S71).
73). Thereafter, the load torque is measured (step S7).
4) In the horizontal axis direction of the display, the coordinates P1 at which drawing is to be performed are calculated (step S75). By the above operation, P indicates the absolute position of the object to be measured irrespective of the rotation direction of the object to be measured, so that P1 is a value obtained by multiplying (P−X0) by the scale S. It is determined whether P1 obtained in this manner is within the range in which drawing is to be performed, 0 ≦ P1 ≦ Xs (step S76), and only when such is the case, drawing is performed (step S77). The above operation is continued until the cumulative pulse number P reaches the pulse number Pn for one stroke as determined in step S78.

When P exceeds Pn, the motor is temporarily stopped (step S79), and the next screen to be drawn is inverted (step S80). At the same time, the direction in which the motor should be rotated is also reversed (step S81). At this time, it is not necessary to reverse the direction to be drawn, as described above.

It is determined that the measurement has been completed (step S8).
2) If the termination is instructed, the measurement is terminated. Otherwise, it is determined whether or not the continuous operation mode has been designated (step S83). Thereby, the rotation of the motor is started again without waiting for the start button to be pressed or after waiting. At this time, needless to say, the rotation direction of the motor is reversed.

Although the detailed embodiments of the present invention have been described above, the present invention is of course applicable to applications other than the case of measuring the load torque of a stepping motor applied device. For example, the torque measurement can be applied to a case where a torque is measured by a device using a torsion bar as generally used. Also,
The present invention can also be applied to a case where the measured amount measures unevenness or temperature distribution related to the position of the measured object.

[0040]

As described above, by using the apparatus for measuring the amount accompanying movement according to the present invention, the measurement is performed in accordance with the movement mode of the object to be measured, and the re-measurement after adjustment is performed based on the result. Can be easily executed, and both can be displayed in association with a plurality of screens of the same display device, so that the industrial effect is great.

[Brief description of the drawings]

FIG. 1 is a basic overall configuration diagram showing one embodiment of a measuring device according to the present invention.

FIG. 2 is a diagram showing a current waveform flowing into an arbitrary phase of an HB type stepping motor when the stepping motor is driven at a constant voltage by 2-2 phase excitation.

FIG. 3 is a diagram showing a relationship between an integral value Q and a load torque TQ.

FIG. 4 is a diagram illustrating an example of a device that rotates a roller by a stepping motor.

5 is a diagram showing a relationship between a paper feed roller, a print head, and a print carriage in a printer using the configuration shown in FIG. 4;

FIG. 6 is a diagram showing a conventional display example of torque measurement data.

FIG. 7 is a diagram showing a display example according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a display example in a case where measurement is performed on a measurement object that reciprocates, such as the print carriage illustrated in FIG. 5, according to the embodiment of the present invention.

9 is a diagram showing an example of a measurement screen configuration for observing the behavior of the measurement target in more detail in the display example of FIG.

FIG. 10 is a diagram showing a change in load torque applied to a stepping motor for moving a carriage in the mechanism shown in FIG. 5;

FIG. 11 is a diagram illustrating an example of a configuration system according to an embodiment of the present invention.

FIG. 12 is a flowchart illustrating a processing procedure for realizing the alternate display illustrated in FIG. 7;

FIG. 13 is a flowchart showing a processing procedure for performing display suitable for a case where the measured object shown in FIG. 8 reciprocates.

FIG. 14 is a flowchart for performing control to start drawing from a predetermined point shown in FIG. 9;

FIG. 15 is a flowchart for realizing display of a measured value of an object to be measured in the same place at the time of going forward and going back in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stepping motor 2 Actual machine mechanism 3
Reference load torque generator 4 Coupling 5, 6
Connector 7 Drive circuit 8
Distribution circuit 9 Controller 10
Current detector 11 Amplifier 12
Switches 13 and 15 Feature extraction unit 14
Reference value memory 16 Measurement value memory 17
Collation judgment unit 18 Display 19
Printer

Continuation of front page (56) References JP-A-61-162258 (JP, A) JP-A-3-100613 (JP, A) JP-A-4-232828 (JP, A) JP-A-4-232514 (JP) JP-A-3-263094 (JP, A) JP-A-2-228522 (JP, A) JP-A-3-78796 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) G01L 5/00 G01D 7/00 H02P 8/38

Claims (6)

(57) [Claims] 1. A measuring means for measuring an amount which changes with a reciprocating movement of a mechanism, a display means having a plurality of screens for displaying the measurement results by the measuring means, and the display of the measurement result, before
Reverses the drawing direction of the display according to the movement direction
And a control means for performing the control as described above . 2. The measuring apparatus according to claim 1, further comprising storage means for storing the display measurement result. 3. The measuring apparatus according to claim 1, wherein the measuring means performs the measurement only until the mechanism is moved by a predetermined amount and then stopped. 4. The measuring apparatus according to claim 1, wherein said control means starts displaying said measurement result from a position corresponding to a predetermined movement position of said mechanism section. 5. The measuring apparatus according to claim 1, wherein said control means displays the measurement results obtained at the same position at the time of going forward and at the time of returning in association with said plurality of screens. 6. The measuring apparatus according to claim 1, wherein said control means displays said measurement result on said display means in association with a marker signal indicating a condition defining said measurement result.