JP2968679B2 - Measurement error display 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 scale error display device suitable for use in, for example, a scale device for measuring the length of a striatum.

[0002]

2. Description of the Related Art As is well known, a measuring device for measuring a length of a filament in an extending direction is provided in a manufacturing machine for producing a filament such as a cable and a wire and a separating machine for cutting the filament. Have been. FIG. 4 is a schematic diagram showing a configuration example of such a conventional measuring device. In this figure, FIG. 1A shows an example of a belt-type measuring device, and FIG. 2B shows an example of a single-wheel measuring device. As shown in these figures, in the conventional measuring device, the running of the striatum 1 is caused by the free rotation of the belt conveyor 3 and the measuring wheel 2.
The rotation of the pulse encoder 4 is replaced by the rotation of the pulse encoder 4 via the measuring wheel 2 (in the case of the single-wheel measuring device), and the output pulse of the pulse encoder 4 is counted by the counter 5. That is, the length of the passed striatum 1 is measured. Hereinafter, this measurement is called a measuring rule.

[0003]

In the above-mentioned conventional measuring device, a measuring error occurs due to the following factors (1) to (5). (1) The diameter of the measuring wheel 2 fluctuates due to the attachment of dust or dust to the outer peripheral surface of the measuring wheel 2 or the wear of the outer peripheral surface. (2) As shown in FIG. 5, when the striated body 1 does not strictly travel in a straight line but travels in an arcuate shape, the measuring wheel 2 contacts the outer peripheral side of the arc. Depending on whether or not it is in contact with the inner circumference side, the measurement result becomes an extra scale (the actual length is larger than the measurement result) or a missing scale (the actual length is smaller than the measurement result). (3) As shown in FIG. 6, when the striated body 1 is not running exactly parallel to the measuring wheel 2 and is skewed by an angle θ, the actual striated body 1 The measurement result is Lcosθ for the traveling distance L of the length, and the length ε = L−Lcosθ (>
0) is extra length. (4) Due to relative sliding between the measuring wheel 2 and the striatum 1, the measuring result becomes excessive. (5) The output pulse waveform is deformed due to a mechanical failure of the pulse encoder 4 or an abnormality of the external power supply. That is, as shown in FIG. 7, in an abnormal state, the pulse waveform is deformed so that the pulse waveform should be one pulse, but should be two pulses or zero pulse with respect to the pulse waveform in the normal state.

In the conventional measuring device, the above (1) to (1)
Despite the lack or extra length due to (5),
There is a problem that the operator cannot know that a measurement error has occurred, and cannot take quick and appropriate measures for the missing or extra length.

The present invention has been made under such a background, and enables an operator to know a measuring error while the measuring device is operating, and to quickly and appropriately measure a missing or extra length. It is an object of the present invention to provide a scale error display device capable of taking a measure.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a measuring wheel that rotates in accordance with the traveling of a measuring object such as a striatum traveling in a predetermined direction, and the measuring wheel. A pulse encoder that generates a pulse corresponding to the rotation of the pulse encoder, and a scale error display device connected to a scale device that includes a counter that counts output pulses of the pulse encoder. A time measuring means for measuring a pulse interval; a time measurement value of the pulse interval; and a constant value of the pulse interval determined by a mechanical configuration of the pulse encoder or the like. It is characterized by comprising a calculating means for integrating the number of times and a display means for displaying the result of the integration by the calculating means.

[0007]

According to the present invention, the time measuring means measures the pulse interval of the output pulse of the pulse encoder, and the calculating means,
Based on the measured value of the pulse interval and a fixed value of the pulse interval determined by the mechanical configuration of the pulse encoder, a scale error for each pulse interval is calculated, and this is integrated for a predetermined number of times. Then, the display means displays the result of the integration by the calculation means. Thereby, the operator can refer to the measuring error of the measuring object during the operation of the measuring device.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of one embodiment of the present invention. In this figure, the same parts as those shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, reference numeral 10 denotes a measuring device having the same configuration as that of the related art, including a measuring wheel 2, a pulse encoder 4, and a counter 5. The output P of the pulse encoder 4 in the measuring device 10 is input to a counter 5 and also to a measuring error display 11 described later.

Reference numeral 12 denotes a take-up machine that conveys the filament 1 in the direction of arrow X. The take-off machine 12 includes a belt conveyor 12a and a motor 12 for driving the conveyor 12a.
and a linear speed detector (for example, a tachogenerator) 12c for detecting a running speed (hereinafter, referred to as a linear speed) of the striatum 1 based on the rotation speed of the motor 12b. The linear velocity signal V output from the linear velocity detector 12c is input to a measuring error display 11 (described later).

The scale error display 11 has a built-in CPU (Central Processing Unit), a memory, and the like.
Based on the output P and the linear velocity signal V, the integration processing of the measuring error described later and the display of the processing result are performed. The measurement error indicator 11 is instructed to reset at the start of operation by a reset button R, and is instructed to stop operation by a stop button S. Similarly, the counter 5 is reset or stopped by pressing these buttons.

Next, the operation of this embodiment will be described. FIGS. 2 and 3 show the CPU in the scale error indicator 11.
6 is a flowchart showing a control program executed by the control program. Hereinafter, the description will proceed along each step of the flowchart. First, in FIG. 2, when the reset button R is pressed, the CPU in the scale error indicator 11
Proceeds to step S1. In step S1,
Register Lε, Lε _1, Lε _2, the value "0" is set to Lε _3. Here, the register Lε is a register for holding the integrated value of the measurement error, and the registers Lε ₁ , Lε
[epsilon] ₂ and L [epsilon] ₃ are registers for holding measurement errors obtained in first to third detection cycles to be described later.

At step S2, the value of the register Lε at this time is displayed on a display unit such as a display (not shown). In this case, the initial value “0” set in step S1 is displayed.

Next, in step S3, a rising edge of an output pulse from the pulse encoder 4 is detected. That is, it is determined whether or not the output pulse of the pulse encoder 4 has risen, and this step S3 is repeated while the determination result is “No”.

When the rising of the pulse is detected, the result of the determination in step S3 is "Yes", and steps S4 to S6 are executed. That is, in step S4, the timer T1 is started to start the time counting operation of the first detection cycle. In step S5,
The linear velocity signal V at this time is fetched, and its level value is set in the register V1. Further, in step S6, the timer T2 for measuring the time of the second detection cycle is reset.

Next, in step S7, the rising edge of the output pulse from the pulse encoder 4 is detected again, as in step S3. When the rising of the pulse is detected, the result of the determination in step S7 is "Yes".
And execute steps S8 to S11. That is,
The timer T1 is stopped to stop the timing of the first detection cycle (step S8), and the timer T2 is started,
The timing of the second detection cycle is started (step S
9). Further, the linear velocity signal V at this time is fetched, and its level value is set in the register V2 (step S10).
Further, the timer T3 for measuring the time of the third detection cycle is reset (step S11).

When the timing of the first detection cycle is completed, steps S12 to S14 are executed, and the first detection cycle is executed.
The processing corresponding to the detection cycle is performed. That is, first in step S12, calculates the total length error epsilon ₁ of the first detection cycle by the following equation (1). ε ₁ = t1 × v1-L (1) where t1 is the time value of the timer T1, and v1 is the register V
The value 1, L, is a constant determined by the mechanical configuration of the measuring device 10, and corresponds to the traveling distance of the filament 1 corresponding to the pulse interval when there is no error. Then, after setting the total length errors epsilon ₁ calculated for register Eruipushiron _1, in step S13, it sets the sum of the values of the register Eruipushiron ₁ registers Eruipushiron to register Eruipushiron. At this time,
In the register Lε, the initial value “0” is set in the aforementioned step S1.
There since have been set, the first total length error epsilon ₁ itself in the detection cycle is set in the register Eruipushiron.
Then, in step S14, it resets the register Lε _1.

Next, in the second detection cycle, the first detection cycle
As in the case of the detection cycle of step S15,
After the rising edge of the output pulse of the pulse encoder 4 is detected again in FIG. 3), steps S16 to S19 are performed.
Execute That is, the timer T2 is stopped, and the counting of the second detection cycle is terminated (step S1).
6) Start the timer T3 to start measuring the time of the third detection cycle (step S17). Further, the linear velocity signal V at this time is fetched, the level value is set in the register V3 (step S18), and the timer T1 for measuring the time of the first detection cycle is reset (step S19).

When the timing of the second detection cycle is completed, steps S20 to S22 are executed, and the processing corresponding to the second detection cycle is performed. That is, first in step S20, calculates the total length error epsilon ₂ in the second detection cycle by the following equation (2). ε ₂ = t2 × v2-L (2) where t2 is the count value of the timer T2 and v2 is the register V
It is a value of 2. Then, after setting the calculated measuring error ε ₂ in the register Lε ₂ , in step S21,
It sets the sum of the values of the register Eruipushiron ₂ registers Eruipushiron to register Eruipushiron. At this time, the register Eruipushiron, since a total length error epsilon ₁ is set in the first detection cycle in step S13 described above, the total value of the total length errors in the first and second detection cycle epsilon ₁ + epsilon ₂ Is set in the register Lε. Then, step S22
In resets the register Lε _2.

Next, in the third detection cycle, the first detection cycle
Step S2 as in the case of the second detection cycle.
After the rising edge of the output pulse of the pulse encoder 4 is detected again in step 3, step S24 is executed. In step S24, the timer T3 is stopped, and the counting of the third detection cycle is ended.

Then, when the timing of the third detection cycle ends, steps S25 to S27 are executed, and the processing corresponding to the third detection cycle is performed. That is, first, in step S25, the measuring error ε ₃ in the third detection cycle is calculated by the following equation (3). ε ₃ = t3 × v3-L (3) where t3 is the time value of the timer T3 and v3 is the register V
The value is 3. Then, after setting the calculated measuring error ε ₃ in the register Lε ₃ , in step S26,
It sets the sum of the values of the register Eruipushiron ₃ registers Eruipushiron to register Eruipushiron. At this time, since the total value ε ₁ + ε ₂ in the first and second detection cycles is set in the register Lε in the above-described step S21,
Integrated value ε ₁ + ε ₂ + ε in _first to third detection cycles
₃ is set in the register Lε. And step S
In 27, it resets the register Lε _3.

Then, the processing of the CPU returns to the above-described steps S4 to S6 (see FIG. 2) again, and repeats the processing of the above-described first to third detection cycles. Thus, during the operation of the scale error display 11, the integrated value of the scale error ε ₁ + ε ₂ + ε ₃ is repeatedly calculated. On the other hand, while the above-described processing is repeated, in the above-described step S2,
The value of the register Lε is displayed again on the display unit at regular intervals. Thus, the operator can refer to the integrated value of the measurement error in real time. Then, when the stop button S is pressed, the operation of the scale error indicator 11 ends.

As described above, according to the present embodiment, the output pulse interval of the pulse encoder 4 is timed, and the measuring error is calculated for each pulse interval based on the linear speed signal V and the constant value L. Is done. And this error is the first to
The integration is performed for the third detection cycle, and the integration result is displayed in real time. Thereby, the operator can always refer to the measuring error while the measuring device 10 is operating, evaluate the error, and take a quick and appropriate measure.

In this embodiment, the measurement error is integrated for three detection cycles. However, the present invention is not limited to this, and the integration may be performed for any number of detection cycles. Further, in the present embodiment, the case where the measuring error is calculated using the linear velocity has been described as an example. However, the present invention is not limited to this. For example, the pulse interval determined by the mechanical configuration of the pulse encoder 4 is known in advance. If held as a value, the difference between this pulse interval value and the actual pulse interval clock value may be regarded as a scale error and integrated.
In this case, the input of the linear velocity signal V becomes unnecessary. Alternatively, an allowable range of the measurement error may be set, and the operator may be notified of whether the integrated value is within the allowable range by a display or a buzzer. Further, as another application example,
For example, if the present invention is applied to a device for measuring the traveling amount of a belt conveyor, it is possible to display a counting error of the number of components and the like flowing at a constant interval on the belt conveyor.

[0024]

As described above, according to the present invention, the operator can refer to the measuring error of the measuring object during the operation of the measuring device. The effect is that prompt and appropriate treatment can be taken.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 shows a CPU in a measuring error display in the embodiment.
5 is a flowchart showing a control program executed by the program (steps S1 to S15).

FIG. 3 is a flowchart showing the control program (steps S16 to S27).

FIG. 4 is a schematic diagram illustrating a configuration example of a conventional measuring device, in which (a) illustrates an example of a belt-type measuring device;
(B) has shown the example of the single wheel measuring device.

FIG. 5 is a view showing a state in which a striated body curves and travels in an arc shape in a conventional measuring device.

FIG. 6 is a view showing a state in which a striated body is skewed in a conventional measuring device.

FIG. 7 is a diagram showing a state in which a waveform of an output pulse of a pulse encoder is deformed in a conventional measuring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Striatal body, 2 ... Measuring wheel, 4 ... Pulse encoder, 5 ... Counter, 10 ... Measuring device, 11 ... Measuring error display, 12 ... Take-off machine, 12a ... Belt conveyor, 1
2b: motor, 12c: linear velocity detector, R: reset button, S: stop button

Claims (1)

(57) [Claims] 1. A measuring wheel that rotates in accordance with the traveling of a measuring object such as a striatum running in a predetermined direction, a pulse encoder that generates a pulse in accordance with the rotation of the measuring wheel, and a pulse encoder. In a scale error display device connected to a scale device including a counter that counts output pulses, a time measuring unit that measures a pulse interval of an output pulse of the pulse encoder, a time value of the pulse interval, Calculating means for calculating a measuring error for each pulse interval based on a fixed value of a pulse interval determined by a mechanical configuration of the pulse encoder and the like, and integrating the error by a predetermined number of times; and displaying an integration result by the arithmetic means. A scale error display device comprising a display unit.