JPH02112468A - Stretch control device in sizing machine or the like - Google Patents

Abstract

PURPOSE:To always keep the tension of a fiber sheet at a proper value in spite of the change of the operating speed of a sizing machine by controlling the stretching ratio of the fiber sheet passing through a water content-changing section the basis of water content signal detected by a water content sensor arranged on the downstream side of the water content-changing section. CONSTITUTION:A water content sensor 11 is disposed on the downstream side of a water content-changing section such as a sizing roller device F2, hot wind drying device H or cylinder drying device F3, e.g., the hot wind drying device H, to detect the water content of the fiber sheet Y. The water content signal of the water content sensor 11 is inputted into a control device 20 to control the roller peripheral speed between the sizing roller device F2 and the cylinder drying device F3 through a non-stage transmission V2, thereby giving a stretching ratio to the fiber sheet Y between the sizing roller F2 and the cylinder drying device F3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to sizing machines, etc. in the textile industry, and is capable of controlling the tension of a running thread sheet at a constant level even if the thread sheet expands and contracts due to sizing and drying. This invention relates to a stretch control device such as a gluing machine.

Prior Art Sizing machines and the like in the textile industry form a yarn sort by arranging on a feed roller a large number of yarns unwound from a yarn supply body on a yarn supply creel, and this yarn sheet is
The running rust is passed through a series of processing devices such as a sizing roller device, hot air drying device, cylinder drying device, cooling device, waxing device, etc. arranged in series on the downstream side of the feed roller, and the yarn sheet that has passed through these devices is wound up. By winding onto a beam, the sizing can create a treated warp warp beam.

Inside the sizing machine, etc., the yarn sheet forms the processing device itself, or is run and driven by a multi-stage active feed mechanism disposed before and after the processing device. The tension of the yarn sheet running through these processing devices can be kept at a predetermined constant value by setting the circumferential speed ratio (hereinafter referred to as stretch) of the adjacent positive feed mechanisms.

Therefore, in conventional sizing machines, etc., this stretch is of course set variably depending on the type of yarn to be set, etc. for each stage of the active feed mechanism, but its value is set once - Even if the operating speed of the machine, that is, the running speed of the straw thread, is changed, it is normally maintained at a constant value. In other words, the stretch between each stage is only set so that the tension of the yarn sheet is a predetermined value at the steady operating speed of the machine, and when the machine is operated at a speed other than the steady operating speed, , was never considered.

The problem to be solved by the invention is that when using this prior art, during low-speed operation where the operating speed of the machine is set to, for example, a fraction to several tenths of the steady operating speed, However, there was a serious problem in that the tension of the thread sheet exceeded its proper value, which could impair the quality of the thread or make stable operation impossible. The yarn that forms the sheet stretches when moistened by sizing, but tends to shrink when dried; therefore, when the operating speed of the machine changes, the yarn sheet is moved to the sizing roller device or the drying device (hereinafter collectively referred to as the moisture content changing section). The moisture content of the yarn sheet (the degree of wetness or dryness of the yarn forming the yarn sheet, expressed as the weight ratio of the amount of moisture contained in the yarn to the yarn weight) , hereinafter the same) changes, the degree of expansion and contraction changes,
If the stretch remains constant, it is inevitable that the tension of the yarn sheet will become inappropriate.

Therefore, in view of the problems of the prior art, an object of the present invention is to measure the moisture content of the yarn sheet on the downstream side of the moisture content changing section, and thereby set and control the stretch between the stages, thereby improving the mechanical performance of the machine. It is an object of the present invention to provide a stretch control device for a sizing machine, etc., which can always obtain an appropriate tension of a yarn sheet regardless of the operating speed.

Means for Solving the Problems The present invention has a structure in which a moisture content sensor for detecting the moisture content of the yarn sheet is installed downstream of a moisture content changing section where the moisture content of the traveling yarn sheet increases or decreases. The gist is that the stretch of the yarn sheet passing through the moisture content changing section is set and controlled based on the moisture content signal from this moisture content sensor.

Note that the moisture content changing section may be any of a hot air drying device, a cylinder drying device, and a sizing roller device.

With this configuration, the yarn sheet is moistened or dried as it passes through the moisture content changing section, so its moisture content increases or decreases greatly, causing expansion and contraction of the yarn sheet. This occurs, and the extent to which it occurs largely depends on the operating speed of the machine. Therefore, the degree of expansion and contraction of the yarn sheet can be measured by detecting the moisture content of the yarn sheet with a moisture rate sensor on the downstream side of the moisture rate changing section. By setting and controlling the stretch of the yarn sheet passing through the moisture content changing section, the tension of the yarn sheet at that point can always be maintained at a predetermined constant value, regardless of fluctuations in the operating speed of the machine.

It works as described above.

Example Examples will be described below with reference to the drawings.

A stretch control device such as a sizing machine is used to control the running yarn sheet Y.
a moisture content sensor 11 that detects the moisture content of
(Figure 1).

The sizing machine, etc., forms a large number of yarns YI SYl... unwound from a yarn feeding body on a yarn feeding creel (not shown) into a yarn sheet Y in a feed roller device F1, and passes this yarn sheet Y to a sizing roller. The film is wound up onto a winding beam (not shown) through a device F2, a hot air drying device r-2, and a four cylinder drying device F3.

The feed roller device F1 is a combination of a feed roller Fla and a pressure roller FibSFib,
The yarn sheet Y held between the two can be actively driven to travel. The sizing roller device F2 includes a sizing roller F2a and squeeze rollers F2b, F2b, and is capable of uniformly adhering the glue in the sizing pan F2c to the yarn sheet Y. The hot air drying device H performs primary drying of the yarn sheet Y using heated air from a heat source (not shown), while the cylinder drying device F3
The yarn sheet Y can be finished dried by running the yarn sheet Y in contact with the periphery of the heated drying cylinder F3aSF3a...

The feed roller device F'l, the sizing roller device F2, and the cylinder drying device F3 are actively driven by a common variable speed drive motor M, forming a multi-stage positive feed mechanism. That is, the cylinder drying device F3 is directly connected to the drive motor M, while the sizing roller device F2 is connected to the drive motor M via the continuously variable transmission V2. It is assumed that the gear ratio can be set via motor SM. Further, the feed roller device Fl is driven by the drive 'v+h of the sizing roller device F2 via another continuously variable transmission Vl. However, it is assumed that the gear ratio of the continuously variable transmission Vl is manually set.

A winding beam (not shown) is disposed downstream of the cylinder drying device F3, and the yarn sheet Y from the cylinder drying device F3 is
can be wound up with a predetermined constant tension.

The control device main body 20 includes a function generator 21 that receives the moisture content signal S as an input, and the function generator 21. The output is transmitted to the operating motor S of the continuously variable transmission V2 via the operating motor controller 22.
Connected to M.

The moisture content sensor 11 is disposed downstream of the hot air drying device H, that is, in the most upstream drying cylinder drying device forming a part of the cylinder drying device F3.

The moisture content sensor 11 is a detection roller l of passive rotation that pinches the yarn sheet Y and moves in contact with the peripheral side of the drying cylinder F3a.
The moisture content W of the yarn sheet Y can be measured by detecting the electric resistance value between the drying cylinder F3a and the detection roller lla (Fig. 2). This type of moisture rate sensor 11 contacts the drying cylinder F3a which is at a high temperature via the thread sheet Y, and since the temperature is high, the glue attached to the thread sheet Y is detected by the detection roller. It is less likely to transfer and adhere to the peripheral surface of lla, and the moisture content can be measured stably.

The moisture content sensor 11 may be of any other type, such as a non-contact far-infrared projection type sensor (Japanese Unexamined Patent Publication No. 62-125034).

Now, in FIG. 1, the number of rotations of the drive motor M and the number of rotations of the drive shaft of the sizing roller device F2 are respectively set to N.
M, N2, and the gear ratio of the continuously variable transmission V2 is a2, then N2 = a2 NM. On the other hand, squeeze roller F2b and drying cylinder F
The circumferential velocities V2 and V3 of the yarn sheet Y between the sizing roller device F2 and the cylinder drying device F3 are 5( 23 is v3 /v2 = 1 + 5t23 - (k3 / 2 ) (1 / a2 ), and therefore a2 = (k3 / 2 ) / (1 + 5L23) holds true.In other words, the speed change of continuously variable transmission V2 The ratio a2 is uniquely determined by the stretch S t 23.

On the other hand, in general, the appropriate stretch St of the yarn sheet Y is determined by the moisture content W of the yarn sheet Y if the types of yarns Yl, Yl, etc. forming the yarn sheet Y are fixed. (Figure 3). In other words, when the moisture content W is large, the seam of the yarn sheet Y is large, so a large positive stretch is required, whereas when the moisture content W is small, the yarn sheet F-Y shrinks, so a negative stretch is required. It is what you need.

Therefore, if a function generator 21 of the control device main body 20 is used that has the input/output characteristics shown in FIG.
As the output of 1, the appropriate stretch St corresponding to the moisture content W of the yarn sheet Y at that time can be obtained. Therefore, the operation motor controller 22 controls this appropriate stretch St.
Therefore, by setting 5t23=St in the above equation, the gear ratio a2 of the continuously variable transmission V2 can be determined, and furthermore, the gear ratio a2 of the continuously variable transmission V2 can be determined via the operating motor SM.
In contrast, the speed ratio a2 can be set and controlled. The speed ratio a2 set in this way realizes an appropriate stretch St corresponding to the moisture content W of the yarn sheet Y as a stretch 5t23 between the sizing roller device F2 and the cylinder drying device F3, Moreover,
This holds true regardless of the running speed of the yarn sheet Y, so the tension of the yarn sheet Y can always be maintained at an appropriate level regardless of the operating speed of the machine.

It goes without saying that the input/output characteristics of the function breaker 21 may be appropriately approximated by a broken line to the curve shown in FIG. Further, it is preferable that the input/output characteristics of the function generator 21 can be changed as appropriate depending on the type of yarn sheet Y to be set.

Another embodiment of the function generator 21 includes a plurality of setters 23, 23...
Depending on the magnitude of the moisture content signal S, these setting devices 23.2
3... can be replaced by a combination with a switching device 24 that switches and connects to the operation motor controller 22 (FIG. 4). In general, the moisture content W indicated by the moisture content signal S does not show large fluctuations because the temperature of the hot air drying device H is controlled. It is often sufficient for practical use even if the stretch st, st, etc. set to .

Between the sizing roller device F2 and the hot air drying device H,
The sizing roller device F2 and the feed roller device F4 are interposed with another feed roller device F4 (Fig. 5).
In accordance with the previous embodiment, if the continuously variable transmissions V2 and V3 are to be actively driven by a common drive motor M, for example, a non-contact moisture sensor 11 may be used to control the continuously variable transmission V2. By setting the speed ratio a2, it is possible to set and control the stretch 5t24 between the sizing roller device F2 and the feed roller device F4. Even if the degree of wetting of the yarn sheet Y in the sizing roller device F2 changes due to fluctuations in the running speed of the yarn sheet Y and its elongation changes, the tension of the yarn sheet 1-Y passing through the sizing roller device F2 is kept constant. can be kept.

The above explanation can be applied as is to all moisture content changing parts where the moisture content W of the yarn sheet Y that travels through greatly increases or decreases.

That is, in addition to the above-mentioned hot air drying device (G) and sizing roller device F2, the cylinder drying device F3 also has multiple stages of active driving of the drying cylinders F3aSF3a, etc., and a continuously variable transmission is provided between them. By disposing the moisture content sensor 11 in the side drying cylinder drying device, completely similar stretch control can be performed, and the tension of the yarn sheet Y passing through the cylinder drying device F3 can be maintained appropriately. Note that the cylinder drying device F3 at this time may use any number of drying cylinders F3a.

In addition, the active feed mechanism of each stage is driven by a common drive motor M.
Even if there is a pasting machine etc. in which an independent variable speed drive motor is provided for each stage instead of being driven by a combination of a continuously variable transmission V1, (2), etc., the moisture content sensor 11 It goes without saying that similar effects can be achieved by using the moisture content signal S from the feeder to set and control the stretch in the adjacent positive feed mechanism.

As described in detail, according to the present invention, the stretch of the yarn sheet passing through the moisture content changing section is controlled by the moisture percentage signal from the moisture percentage sensor disposed downstream of the moisture percentage changing section. By controlling the settings, the yarn sheet is moistened, dried, and expanded and contracted in the moisture content changing section, and even if the degree of expansion and contraction changes due to fluctuations in the running speed of the yarn sheet, the expansion and contraction of the yarn sheet at that time can be controlled. Since the stretching corresponding to the above can be achieved accurately, the tension of the yarn sheet can always be maintained at an appropriate level regardless of the operating speed of the machine, which is an excellent effect.

[Brief explanation of the drawing]

1 to 3 show an embodiment. FIG. 1 is an explanatory diagram of the overall configuration, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is an input/output characteristic diagram of the function generator. FIG. 4 is a main part configuration diagram showing another embodiment. FIG. 5 is an explanatory diagram of the main part configuration showing another embodiment. Y... Yarn sheet W... Moisture rate S... Moisture rate signal St... Stretch F2... Sizing roller device F3... Cylinder drying device H... Hot air drying device 11... Moisture rate sensor

Claims (1)

[Scope of Claims] 1) A moisture content sensor for detecting the moisture content of the yarn sheet is disposed downstream of the moisture content changing section where the moisture content of the traveling yarn sheet increases or decreases, and the moisture content from the moisture rate sensor is A stretch control device, such as a sizing machine, configured to set and control the stretch of a yarn sheet passing through the moisture content changing section based on a percentage signal. 2) The stretch control device for a pasting machine or the like according to claim 1, wherein the moisture content changing section is one of a hot air drying device, a cylinder drying device, and a sizing roller device.