JPH0327126A - Toe non-uniformity measure- ment method - Google Patents

Abstract

PURPOSE: To monitor the ununiformity of tow by using a mechanical detection element comprising a pair of squeeze roller on the tow line without additive measurement means. CONSTITUTION: When the ununiformity of tow is monitored, in other words, measured by means of a mechanical detection element set on the tow line- production step, the interval between the stationary roller at a couple of squeeze rollers on the tow line and the contact line is utilized as a mechanically detecting element and the bearing or the bearing supporter of the movable roller in the squeeze roller is connected to the sensory pin of the static or inductive detection head. Thus, the movement of the squeeze rollers is detected by the displacement generated on the sensing head, when the ununiform part in the tow thickness passes through the roller gap of the squeezer rollers, thereby monitoring the ununiformity of the tow.

Description

[Detailed Description of the Invention] (Industrial Application! [F] The present invention relates to the Jj method for measuring non-uniformity of 1... The present invention relates to a method of monitoring or measuring tow non-uniformity using target detection Tj8.

(Prior Art) In the production of synthetic fibers, under numerous post-processing steps,
It is necessary to impart desired textile properties to the spun yarn. Examples of commonly required post-processing steps include pre-spinning, setting,
There is crimping and, where appropriate, cutting of the continuous filament to make it stable. These post-processing steps are generally performed at multiple tow lines within a factory by first bundling filaments from a number of spinnerets to form a single tow. This single tow is stored in a can and bundled into many tows, and then these many tows are transferred together to the above-mentioned post-processing steps such as pre-spinning, setting, and crimping in the tow line. It will be done. Tows that have been simultaneously post-treated in this way have a large number of individual filaments, typically hundreds of thousands to millions of individual filaments.

In particular, the tow which is subsequently subjected to further processing as converter tow, ie as cutting tow or fiber-filled tow, must have a uniform quality and, in particular, must consist of a constant number of filaments.

Variations in the thickness of a single tow result in non-uniformity and therefore quality defects in the final product.

For technical reasons, e.g. the new spun filament tow in the can does not have an infinite length, imperfections that cause the supply can to be used up and the replacement tow that is required. replenishment cannot be avoided. Therefore, it is necessary to measure tow irregularities in order to be able to eliminate from the production process parts with poor quality of the final product due to irregularities. It is customary for tows to be visually inspected by workers. Also, it is already possible in some fields to use automated equipment that is supposed to minimize the effects of tow irregularities in the final product.

In German Patent Publication 2, 144, 104, Lamas (
Lummus) cutter means are disclosed. This lath cutter means consists of a blade fixedly attached to a reel. The tow is wound on the reel and cut by the winding force. Variations in the thickness of the tows pose a major problem in the cutting process described above. This German patent publication 2, 1
The cutter means disclosed in No. 44, I-Ro 4 is equipped with a sensitive roller. The sensitive roller runs across the wound tow, and the position of the sensitive roller depends on the thickness of the tow wound on the bladed reel. If the thickness of the tow to be wound is detected by the contact roller to be thicker than a predetermined value under the above method, the sensitive roller will cause a certain control or warning operation.

German publication 2,400,293 discloses a thickness detector (monitor) placed on the toe line. This monitor consists of a mechanical sensor placed in the tow line whose signal triggers a process whereby thick spots on the tow are marked, e.g. by dye or powder deposited by spraying. is attached. The region marked with this mark is detected by a detector after commercialization, for example after cutting, and
and removed.

German Patent No. 11,208 discloses an electrical sensor for detecting thick spots. The sensor includes a detection saddle that is placed on a tow running on a guide roller.

As soon as the thick portion crosses the guide roller, the detection saddle is displaced upward and an electrical control signal is output.

U.S. Pat. No. 4,041,584 discloses an apparatus for improving the quality of stuffing boxes into which crimped tow is placed. In this device, the stuffing box is advanced by a pair of conveyor rollers, one of which is stationary and the other conveyor roller is movable. It is also hydraulically pressed in a direction opposite to the stationary rollers to form a roll nip into which the tow to be talimped is drawn and forced into the crimping box. If the thicker part of the tow passes through the roll nip, the contact roller will rise somewhat and the pressure in the pneumatic system will increase. After the thick part of the tow passes through the roll gap, the movable contactor is moved by the air pressure!・Laura's essence〒． High responsiveness is ensured. According to this device, it becomes possible to more uniformly stuff the material into a tight packing box. This device also makes it possible to improve the quality of the crimped product, and is not intended to signal the appearance of thick spots with the aim of eliminating the resulting poor quality end product from the production process, nor does it necessarily It's not appropriate.

The object of the invention is to make it possible to monitor the tow during the manufacturing process at the tow line without adding detection means to the tow path.

(Means for Achieving the Technical Problem) A tow line is generally characterized by having L or more conveying means in the form of a pair of squeeze rolls, and the pair of squeeze rolls are A nip between the rolls is formed, and the tow is attracted to and transported by the nip between the rolls. Another pair of squeeze rolls is provided downstream of the toe line, e.g. the spin finishing bath, for feedback control of the spin finishing bath.

The method according to the invention consists of using 111 a squeeze roll in any case as a mechanical sensing element for measuring the thickness of the tow;
The distance between the roller and the stationary roller is taken as a measure of tow uniformity.

The distance between the above contact roller and the fixed roller described in ``2'' is as follows:
Preferably, it is measured by a displacement transformation 23. When the displacement of the contact roller, and thus the thickness of the traveling tow, exceeds a predetermined value by L times, a defect signal is immediately output. By receiving this signal, it becomes possible to eliminate uneven parts of the final product due to tow abnormalities from the production process. The method according to the present invention not only makes it possible to detect thick parts of tow, but also
Enables detection of thin spots. These thin spots also cause a decline in the quality of the final product.

The limit value for the spacing between the rolls, i.e., the limit value for pointing out defects in the tow exceeding the permissible range and thereby outputting an alarm signal, is determined experimentally.

Displacement transducers suitable for measuring the position of the contact rolls include, in addition to the preferred electrostatic or inductive sensors,
Basically all known types, for example mechanical sensors, in particular those with adjustable contact spacing.

In an electrostatic displacement transducer, the movement of a sensitive pin is replaced by the displacement of the electrode of a measuring capacitor connected to the sensitive pin, and all movements of the upper sensitive pin are due to the electrostatic capacitance of said measuring capacitor. It appears as a change.

In the case of an inductive displacement transducer, the movement of the sensitive pin is replaced by an armature as the core of the measuring coil, and the movement of the armature appears as a dielectric change in the L coil.

In a special example, the L armature also serves as the core of two coils connected as branches of a dielectric bridge circuit.

As a result, the displacement of the -1 and 2 armatures appears as a change in the dielectric resistance of the two coils in the anti-moon direction, and appears in the voltage of the bridge.

- The use of highly sophisticated dielectric sensors to measure the gap between the rolls is particularly effective.

The sensitive pin of the measuring head is connected to the bearing or bearing support of the drive roll of the squeeze roll pair, so that when the maximum possible defect has passed through the nip between the squeeze rolls, the squeeze roll The movement of the roll corresponds approximately to the maximum possible displacement of the sensitive pin of the measuring head.

In a particularly preferred embodiment, a pair of lead-in rolls that guide the crimping rock are used as the measuring device. In other words, by using the distance of one roller of contacts to measure the thickness of the tow, it is possible to detect a thick part of the tow.

If the displacement transducer that detects the position of the pair of squeeze rolls outputs an analog signal, all changes in tow thickness can be continuously monitored by a recorder. The alarm signal generated when the limit is exceeded can be used, for example, to light up a warning lamp. The warning lamp may be disposed downstream of the pair of rolls in an area where tow processing equipment, such as a crimping machine, is located, to inform the operator that there is an unacceptable defect in the tow. . For example, within the folding area of the tow, and after some time after the above defects have gone through the setting process.
It is possible to generate a signal, and at the same time, a signal can be generated upstream of the cutting machine to prevent subsequent canning processes and to remove out-of-spec parts caused by tow non-uniformity. .

The signal generated by the displacement transducer in conjunction with the contact roll can also be used, in a preferred embodiment, to mark defective locations on the tow with an identification color. This allows this non-standard part to be removed, for example by a tow gatherer or by a cutting machine.
It can be removed manually or automatically.

Effects of the Invention A particular advantage of the method according to the invention is that it does not require additional measuring means in the towline process, using existing squeeze rolls, e.g. squeeze rolls, preferably introduction rolls as measuring elements. This means that it can be used.

Claims (4)

[Claims] (1) A method for monitoring or measuring tow nonuniformity using a mechanical detection element provided in the production process of a tow line, the mechanical detection element comprising a pair of squeeze rolls present in the tow line. A tow non-uniformity measuring method, characterized in that the distance between the stationary roll and the contact roll in the squeeze roll is used to measure the tow non-uniformity. (2) The device according to claim (1), wherein the mechanical detection element comprises an introduction roll of a crimping box. (3) In claim (1) or (2), the bearing or bearing support of the movable roll of the pair of squeeze rolls is connected to a sensitive pin of an electrostatic or inductive measuring head, and the maximum possible The movement of the squeeze roll corresponds approximately to the maximum displacement produced by the sensitive pin of the measuring head when a maximum defect passes through the nip between the rolls of the squeeze roll. (4) In any one of claims (1) to (3), the signal output by the measuring head corresponds to the following general development, that is, a tow processing device arranged downstream of the pair of rolls. and/or to raise a certain signal in the tow folding area, and also to cause a defect in the tow some time after it has gone through the setting process, and to indicate that the tow is out of specification upstream of the cutting machine. A device used to remove parts of the body.