JP2572300Y2 - Thread break detector for thread sheet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved yarn break detector for monitoring a yarn break in a yarn sheet.

[0002]

2. Description of the Related Art Normally, in a warping machine, a sizing machine and a dryer, a large number of yarns are run in parallel at the same time, and processed in a sheet form. However, since too many yarns are handled at the same time, the number of yarns is so large that it is not possible to monitor each one of the yarns individually. There was a problem that he did not notice.

For example, Japanese Utility Model Laid-Open Publication No. Sho 62-6394 discloses an apparatus in which a light emitter and a light receiver are arranged opposite to each other and an optical axis is arranged below a yarn sheet, thereby detecting a yarn breakage. . This device detects a yarn break by monitoring for a yarn end hanging from a yarn sheet due to a yarn break. However, this device has a drawback that some of the yarns in the yarn sheet that are not broken are slackened and hung, and this interrupts the optical axis and erroneous detection of a broken yarn occurs frequently. For this reason, in this device, the optical axis cannot be brought too close to the thread sheet, and conversely, even if the thread breaks, the yarn end moves from the thread sheet because the running speed is too high. There is also a major drawback in that if the yarn does not hang down too much, the yarn breakage will be missed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional thread break detection in a thread sheet, and is capable of accurately detecting a thread break in a thread sheet. It is a technical task to do so.

[0005]

In order to solve the above-mentioned problems, a means adopted in the present invention is to dispose a jump bar below the yarn sheet so as to intersect with the yarn sheet traveling direction and employ a photoelectric yarn sensor. Then, the optical axis is arranged at a position downstream of the jump bar and above the yarn sheet, thereby constituting a detector for monitoring a yarn break in the sheet.

If there is a yarn break in the yarn sheet and the cut yarn end passes through the jump bar arrangement location and comes into contact with the bar,
The cut yarn end is jumped up by the jump bar, and can be detected by the yarn sensor located downstream. Even if the slack yarn that has not broken has passed through the jump bar arrangement location and touched it, and received an upward force, it has received a certain amount of tension from the front and back. Does not jump. Therefore, in the present invention, the presence or absence of a thread break can be detected by monitoring whether or not there is a greatly jumped-up thread. In addition, if such a method is adopted, even if the jump bar is arranged at a position where the jump bar comes into contact with the slackening yarn that does not cause the yarn breakage,
This yarn does not jump up so much due to the tension from the front and back, so that erroneous detection does not occur as in the prior art.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

[0008] Each yarn is drawn out from a number of yarn feeders Y set on the creel K and wound around a warp beam B via three guide rolls R to perform warping. At this time,
The yarns are arranged in the same plane by the guide rolls R to form a yarn sheet S.

In order to detect a thread break in the thread sheet S, a thread break detector A is installed between the first two guide rolls and the last one guide roll. The yarn break detector A includes a jump bar 1, a support bar 3, which is arranged to contact the yarn sheet from below, and an optical axis 2L.
And a photoelectric yarn sensor 2 arranged above the yarn sheet. When there is actually a yarn break, the cut yarn end travels in a hanging state, and is eventually jumped up by the jump bar 1, Since the yarn crosses the optical axis 2L of the photoelectric yarn sensor 2, if this is monitored, the yarn break can be detected. At this time, the optical axis 2L of the photoelectric yarn sensor 2 is preferably arranged at a position about 0 to 20 cm downstream from the jump bar 1 with reference to the yarn sheet traveling direction. Incidentally, the photoelectric yarn sensor 2 of this embodiment is not much different from the conventional one, and the optical axis 2L is formed between the light projecting element 21 and the light receiving element 22, and if the yarn crosses the optical axis 2L, The amount of light emitted from the light projecting element 21 and received by the light receiving element 22 decreases, and the presence of the yarn is detected.

In addition to the above embodiment, an auxiliary photoelectric yarn sensor having an optical axis 4L is arranged at a position upstream of the jump bar 1 and below the yarn sheet S when viewed from the yarn sheet traveling direction. A yarn that has broken and a yarn that droops greatly from the yarn sheet is detected in an auxiliary manner, or the jump bar 1 is installed slightly below the yarn sheet S so that only the yarn that breaks and hangs It is also possible to make them jump on contact. Note that the support bar as in the above embodiment is not always required.

[0011]

[Effects of the Invention] As described above, the yarn break detector of the present invention can reliably detect a yarn break in a yarn sheet with few errors.
Much more reliable than conventional products. Therefore, the present invention has industrial value.

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating an installation state of an embodiment.

FIG. 2 is an explanatory perspective view of the embodiment.

FIG. 3 is a schematic side view illustrating the operation of the embodiment.

FIG. 4 is a schematic side view of a modified example.

FIG. 5 is a schematic side view of a modified example.

[Explanation of symbols]

 1 jump bar 2 photoelectric thread sensor

Claims (2)

(57) [Scope of request for utility model registration] 1. A detector for monitoring a yarn breakage of a yarn constituting a sheet in a traveling yarn sheet, comprising: a jump bar disposed below the yarn sheet so as to intersect with the yarn sheet traveling direction; A photoelectric yarn sensor having an optical axis disposed at a position downstream of the jump bar and above the yarn sheet with respect to the jump bar. 2. An auxiliary photoelectric yarn sensor having an optical axis disposed at a position upstream of the jump bar and below the yarn sheet with respect to the yarn sheet traveling direction as a reference. Thread break detector for thread sheet.