JP2001208507A - Length measuring roller system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and certainly detect the generation of abnormality in a length measuring roller. SOLUTION: A length measuring roller system is equipped with the length measuring roller system 12 brought into contact with the work W continuously fed by a drive roller 10 to rotate and measuring the feed quantity of the work W based on the rotation of the roller, a first encoder outputting a pulse signal in connection with the rotation of the drive roller 10, a second encoder outputting a pulse signal in connection with the rotation of the length measuring roller system 12, a count board 14 for counting the Z-phase pulse signal outputted from the first encoder and the A-phase pulse signal outputted from the second encoder and a judge device 16 for judging the abnormality of the length measuring roller system 12 based on the relation between the counted Z-phase and A-phase pulse signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a length measuring roller system, and more particularly to a length measuring roller system suitable for detecting an abnormality occurring in a length measuring roller in real time.

[0002]

2. Description of the Related Art In general, as a device for measuring a feeding length when a belt-shaped work (a band-shaped body) made of printing paper or a plastic sheet is continuously fed, a length measuring roller is brought into contact with the fed work. There is known a length measuring roller system for performing measurement based on the rotation of a roller accompanying the movement of the work.

[0003]

However, conventionally,
An operator's visual monitoring of the roller surface is necessary to detect an abnormality in the length measuring roller itself.Furthermore, even if this monitoring is performed, the roller surface may be scratched or dust may adhere. As a result, the length measurement error caused by the change in the circumferential length of the roller due to the change in the surface state could not be grasped. Also, if used for a long time, the roller surface will wear and wear off, so it is very little by little,
Since the diameter decreases and the circumference gradually decreases, there is also a problem that an error occurs in the measured length value over time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to easily and surely detect the occurrence of an abnormality of a length measuring roller which causes a measurement error without performing visual monitoring. An object of the present invention is to provide a length measuring roller system that can perform the measurement.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a length measuring roller system, in which a belt continuously fed by a drive roller is brought into contact with and rotated, and the feed amount of the belt is measured from the rotation amount. A long roller, a first encoder that outputs a pulse signal in conjunction with the rotation of the drive roller, a second encoder that outputs a pulse signal in conjunction with the rotation of the length measurement roller, and a signal that is output from the first encoder. Counting means for counting the first pulse signal and the second pulse signal output from the second encoder, respectively, based on the relationship between the counted first pulse signal and the counted second pulse signal, the abnormality of the length measuring roller. This problem has been solved by providing a determination means for determining the above.

That is, in the present invention, the measurement is performed based on the relationship between the first pulse signal corresponding to the rotation amount of the drive roller for feeding the strip and the second pulse signal corresponding to the rotation amount of the length measurement roller. Since the abnormality of the surface state of the long roller is detected, the generated abnormality can be detected in real time, so that the occurrence of the length measurement error can be easily and reliably detected regardless of the cause.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram including a perspective view showing a main part of a length measuring roller system according to an embodiment of the present invention.

The length measuring roller system according to the present embodiment has a length measuring roller 12 which is brought into contact with a work (band-shaped body) W continuously fed by a drive roller 10 and measures a feed amount of the work W based on its rotation. A first encoder (not shown) for outputting a pulse signal in conjunction with the rotation of the drive roller 10, and a second encoder (described later) for outputting a pulse signal in conjunction with the rotation of the length measuring roller 12
An encoder / counter board (counting means) 14 for counting a first pulse signal output from the first encoder and a second pulse signal output from the second encoder, respectively, and an input from the counter board 14. A determination device 16 including a computer that determines an abnormality of the length measuring roller 12 based on the counted relationship between the first pulse signal and the second pulse signal is provided.

FIG. 2A is a front view of the length measuring roller 12 as viewed from the side of the work, and FIG.
FIG. 2 is a side view showing the vicinity thereof.

Around the length measuring roller 12, a urethane (or rubber or the like) 12A is wound around the measuring roller 12 to prevent slippage between the measuring roller 12 and the workpiece W, and is supported by a frame member 18. The rotation shaft 12B is connected to a second encoder 20 fixed to the frame member 18 via a coupling 22, and the second pulse signal is transmitted from the encoder 20 in conjunction with the rotation of the length measuring roller 12. Is output.

In the length measuring roller system according to the present embodiment, as shown in FIG. 1, when the work W is fed by the drive roller 10 in the direction of the arrow, as shown in FIG.
As shown in (A), each pulse signal of the Z phase, which is output by one pulse per one rotation of the roller 10, and the A phase, which is output by a plurality of pulses during the rotation, are output regularly.

At the same time, when the length measuring roller 12 in contact with the work W rotates according to the feed amount of the work W, the second encoder 20 shows the characteristic in FIG. As described above, a plurality of A-phase pulse signals are output during one rotation of the drive roller 10, that is, one Z-phase pulse.

The A-phase pulse signal output in conjunction with the rotation of the length measuring roller 12 is output when the length of the length measuring roller 12 is normal (“normal” in the figure). A pulse signal having a constant interval and width is regularly output for each output Z-phase pulse. However, when the surface of the length measuring roller 12 wears over time, the characteristics of the pulse signal are gradually reduced as shown in the middle part of FIG. The cycle becomes shorter,
If the number of pulses between the 1Z phases increases slightly, and if the surface is flawed or dusty, sudden fluctuations occur periodically as shown in the lower part.

Therefore, the change of the pulse signal accompanying the rotation of the length measuring roller 12 per one rotation of the drive roller 10 shown in FIG. Abnormality can be detected.

In the present embodiment, utilizing this principle, steps 1 to 4 of the flowchart shown in FIG.
Z output in conjunction with the rotation of the drive roller 10
The A-phase pulse signal output in association with the rotation of the length measuring roller 12 at each one-pulse interval of the
4, and the determination device 16 compares the difference between the count number and the reference value each time with a predetermined value (a preset threshold value). If the change amount is equal to or more than the predetermined value, it is determined that there is an abnormality. A warning is issued (step 5). Thereby, the self-diagnosis function of the length measuring roller 12 can be provided to the length measuring roller system of the present embodiment.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which marking is performed on a surface of a work W at predetermined intervals will be described more specifically. As shown in FIG. 5, the length measuring roller system according to the present embodiment employs an inkjet 24 for printing marks at predetermined intervals on a work W such as a printing material (paper) sent in the direction of the arrow. It is substantially the same as FIG. 1 except that it is arranged at a predetermined position.

In such a length measuring roller system, the accuracy of the marking position when marking a predetermined position on the work W is determined by the accuracy of the measurement by the length measuring roller 12. Now, the diameter of the drive roller 10 is φ200.0.
mm, the diameter of the length measuring roller 12 is 40.0 mm, and an encoder (second encoder) with a resolution of 5000 pulses is used. Of 1
During the rotation, the length measuring roller makes five rotations.

At this time, the resolution of the length measuring roller 12 itself is 40.0 × π ÷ 5000 = 0.02513 mm. If the allowable accuracy of the marking is 0.5 mm, this is converted into the number of pulses. 0.5 ÷ 0.02513 = 19.8, which corresponds to about 20 pulses of the length measuring roller 12.

Therefore, when the self-diagnosis function of the length measuring roller system is provided in this case, the threshold value for issuing an alarm (warning) in step 5 of the flowchart is 2
Zero pulse can be set.

As schematically shown in FIG. 6, when a flaw is generated on the surface of the length measuring roller 12 or dust adheres, the circumference of the roller is equivalent to the height of dust or the like.
Only longer. In the case where a self-diagnosis function for judging this as abnormal is provided, when the circumference of one rotation of the length measuring roller 12 is increased by, for example, 0.1 mm or more due to adhesion of dust or the like, it can be regarded as abnormal. Make the alarm sound in a similar way. Thereby, the operator can measure the length of the measuring roller 12.
You can immediately notice abnormalities.

Also, as schematically shown in FIG. 7, when the surface of the length measuring roller is uniformly worn down, for example, abrasion up to 0.03 mm in diameter can be allowed. In the case of further wear, an alarm may be sounded in the same manner. When the cause of the abnormality is abrasion, the pulse count number gradually increases as compared with the case of a length measurement error generated when flaws or dust adheres. Therefore, the cause of the abnormality is estimated from the generation process. be able to.

According to the embodiment described above, it is possible to diagnose in real time abnormality of the surface state such as abrasion of the length measuring roller 12, generation of flaws, adhesion of dust, etc., and failure of the encoder. Can be identified.

That is, it is possible to measure the degree of wear by increasing the number of pulses associated with the rotation of the length measuring roller 12 counted while the drive roller 10 is rotating for a predetermined time without decreasing. And the phenomenon can be easily grasped.

Further, since pulse fluctuations occur periodically, generation of flaws and adhesion of dust can be detected. At this time, the roller diameter and the resolution of the encoder are determined so that the number of pulses of the length measuring roller 12 counted during a fixed time of the drive roller 10 (for example, during the Z phase of the encoder) is a multiple of one rotation of the length measuring roller. This makes it possible to easily grasp the periodic fluctuation of the pulse signal.
Further, it is possible to detect a failure of the encoder from a phenomenon that a pulse signal is not output due to the rotation of the length measuring roller 12, and the like.

The length measuring roller system of the present invention can utilize existing equipment, so that it can be easily and inexpensively implemented, and it is easy to maintain the surface of the length measuring roller 12 in a normal state. Therefore, the work feed amount can always be accurately grasped.

Although the present invention has been specifically described above, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist thereof.

For example, in the above-described embodiment, specific numerical examples have been shown as the diameters, thresholds, and the like of the drive roller 10 and the length measuring roller 12, but it is needless to say that the present invention is not limited to these numerical values.

[0029]

As described above, according to the present invention,
It is possible to easily and reliably detect the occurrence of an abnormality in the length measuring roller that causes a length measurement error or the like without performing visual monitoring.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a length measuring roller system according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a length measuring roller and a side view showing the vicinity thereof.

FIG. 3 is a diagram showing an encoder output pulse due to rotation of a drive roller and a length measuring roller.

FIG. 4 is a flowchart illustrating a procedure for detecting an abnormality of the length measuring roller according to the embodiment;

FIG. 5 is a schematic perspective view showing a main part of the length measuring roller system of the embodiment.

FIG. 6 is a diagram for explaining a phenomenon when a flaw occurs on the surface of the length measuring roller.

FIG. 7 is a diagram for explaining a phenomenon when the surface of the length measuring roller is worn.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Drive roller 12 ... Length measuring roller 14 ... Encoder / counter board 16 ... Judgment device 18 ... Frame member 20 ... Second encoder 22 ... Coupling 24 ... Inkjet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Atsushi Okazawa, Inventor 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. No. 1 Dai Nippon Printing Co., Ltd. F term (reference) 2F063 AA12 AA35 BC05 BD15 CA02 DA02 DA04 DB07 DC08 DD03 GA80 LA15 LA23 MA08 2F077 AA04 AA10 TT21 TT24 TT25 TT75 TT76 TT77

Claims (2)

[Claims] 1. A length measuring roller for contacting and rotating a strip continuously fed by a drive roller, and measuring a feed amount of the strip from the rotation amount; and a pulse in conjunction with the rotation of the drive roller. A first encoder that outputs a signal, a second encoder that outputs a pulse signal in conjunction with rotation of the length measuring roller, a first pulse signal that is output from the first encoder, and a second encoder that outputs a pulse signal. Counting means for counting each of the two pulse signals; and determining means for determining an abnormality of the length measuring roller based on the relationship between the counted first pulse signal and the counted second pulse signal. Measuring roller system. 2. The method according to claim 1, wherein the first pulse signal is output once per rotation of the drive roller, and the second pulse signal is output a plurality of times per rotation of the length measuring roller. A length measuring roller system, wherein the determination unit determines that the second pulse signal output per one rotation of the drive roller relative to a reference value exceeds a predetermined threshold value and determines that the second pulse signal is abnormal.