JPH06248531A - Method for rewinding yarn on warp beam and beam warper used for said method - Google Patents

Abstract

PURPOSE: To provide a method for rewinding threads which is capable of forming more uniform band thread layer thicknesses by a warp beam and a beam warper for implementing this method. CONSTITUTION: A table relating to the diameter values of the theoretical band thread layers at specific numbers of revolutions is provided. The diameters of the band thread layers at respectively specific number of revolutions are measured. Thread tension is corrected if a deviation between the value of a provided diameter and the measured diameter is generated. The beam warper for implementing this method has a storage device (21), a diameter measuring instrument (11) for detecting the diameters of the actual band thread layers, a comparator (22) for determining deviations, a regulator, such as an output device (23) consisting of a digital computer (16) for changing the yarn tension by a thread tension device 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rewinding a yarn to a warp beam to which the yarn is supplied via a yarn tensioning device, and a rough winding warper for implementing this method.

[0002]

2. Description of the Prior Art In a known Aramaki warping machine (German published patent publication No. 25 10 517), a warp beam is threaded from a warping drum equipped with a cone of a partial warping machine to a warp beam. The whole is rewound. The yarn tension is measured by using the guide roller and adjusted by the braking control operation of the warping drum. Previously, when warping an individual thread layer, the warping operation of the subsequent thread layer is performed by copying the warping operation of the first thread layer during the warping, thereby achieving uniform warping. I was taken into consideration.

The object of the present invention is to produce a characteristically improved yarn layer for a warped beam.

[0004]

According to the present invention, the object of the present invention is to determine the diameter value of a yarn thread layer which theoretically occurs when the thickness of the yarn thread layer is uniform, for each specific rotational speed of the warp beam. A table (table) set to the above is created, the diameter of the yarn layer at the specific rotation number is measured, and the measured diameter causes a deviation from the set diameter value (table value). Is solved by correcting the thread tension.

According to the underlying idea of the invention, a yarn which is first uniformly warped and then rewound with a constant yarn tension is then formed into a finished fabric when knitted, for example in a warp knitting machine. This leads to non-uniformities, which are based on the idea that they can be prevented if the thread layers of the warp beam have a substantially constant thread layer density. In other words, it is a well-known fact that, for a given yarn tension, the warp beam's yarn layer is pushed in with varying strength depending on the already produced yarn layer thickness, so that the yarn layer density changes. This causes the wound yarn to be subjected to various invariant loads over the diameter of the yarn layer, which may result in changes in properties, such as bulkiness, elongation and the like.

According to the present invention, the above inconvenience is prevented. Then, in order to make the diameter of the band yarn layer follow the theoretically obtained diameter value (referred to as the theoretically obtained diameter), it suffices to change the yarn tension relatively slightly. In addition, the diameter of the thread layer can be measured without difficulty, so that the process as a whole is extremely simple.

Another advantage of the warp beam yarn layer thus produced is that with each rotation of the warp beam the unwound yarn length increases by the same amount. It is known from DE 31 11 112 that the yarn length delivered can be calculated by simply measuring the angle of rotation with a warp beam, and yet an extremely accurate result. Means that you can get

The diameter value at a specific rotation speed of the table is
It is advantageous if the values (diameters) stored in the recalled (readable) table are compared with the measured diameters and the thread tension is corrected automatically. This allows the diameter to be checked (detected and compared) at small intervals, but the diameter of the yarn layer can be monitored without interrupting the rewinding operation.

The method described above is facilitated by making contactless diameter measurements.

The Aramaki warping machine for carrying out this method is
According to the present invention, a storage device for recording a table in which the diameter value of a theoretically produced yarn layer is set for each specific rotation number of a warp beam, a measuring device for detecting the actual diameter of the yarn layer, and a measurement It is established by including a comparator for obtaining the deviation between the set diameter value and the set diameter value, and an adjusting device for changing the yarn tension by the yarn tension device. The additional measures required for the yarn tensioning device lead to only a slight increase in cost.

An advantageous arrangement is that a digital computer is provided, which has the storage device and which forms the comparator and controls the adjusting device automatically. This configuration will facilitate diameter correction during successive rewinding operations.

Suitable contact-free measuring devices are in particular photoelectric barrier sensors or electronic cameras (CCD cameras), in particular video cameras, or contactless switches.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the preferred embodiments shown in the drawings.

The warping drum 1 provided with the cone 2 is an electric motor 3
Driven by. A plurality of warp layers 4 are successively warped by one warping operation, first the first warp layer being wound up and then all subsequent warp yarn layers being wound up on this first warp layer. It is done by copying the action.

When the warp beam 6 is rewound from the warp drum 1, the yarn sheet 5 spread over the entire working width of the warp drum 1 is wound on the warp beam 6. A thread layer 7 is formed around the winding core. The band yarn layer 7 is limited in the width direction by the end flanges 8 and 9. An electric motor 10 is used to drive the warp beam 6. The diameter measuring device 11 provided in the periphery is provided with a track 13 provided in the radial direction while maintaining a relative position with respect to the peripheral surface 12 of the band yarn layer 7.
It is possible to slide along. In the form shown in FIG.
The diameter measuring device 11 is formed by a photoelectric barrier type sensor (photoelectric sensor) having a light emitter 14 and a light receiver 15.

The digital computer 16 has an input 17, to which the speed signal of the motor 10 for the warp beam 6 is fed via a signal line 18 and from the measuring device 11 via a lead 19. A diameter signal for the diameter of the thread layer is input respectively. The digital computer 16 further has a keyboard 20 for input, through which a diameter value at a specific rotation speed can be input, which diameter value is used in the form of a table for each identification of the warp beam 6. The diameter value is stored in the storage device 21 so that it can be assigned to a rotational speed. Whenever the warp beam 6 reaches a specific speed based on the speed signal on the signal line 18, the comparator
At 22, the diameter based on the measurement supplied via conductor 19 is compared with the diameter value retrieved from the storage device 21. When a deviation occurs between both diameters (between the measured diameter and the diameter value), the rotation speed of the electric motor 3 is changed from the output device 23 via the command line 24. As a result, the thread sheet 5
The yarn tension is changed so as to increase the diameter uniformly on the warp beam 6. In order to adjust the thread tension in this way,
In this embodiment, the electric motors 3 and 10 form a yarn tension device 25, and the adjusting device of the yarn tension device 25 is the output device 23 of the digital calculator 16 in this embodiment.
Has been formed.

Before rewinding, the theoretical diameter value of the warp beam 6 in the completed state after rewinding is obtained based on known data such as the number of yarns, the count, the winding thickness on the warp drum, and the like. .

Taking into account the required number of windings, the value of the increase in the diameter of the thread layer per winding is obtained. Therefore, the digital computer 16 can write the theoretical diameter value corresponding to the specific number of turns in the table. When a deviation occurs between the theoretical diameter value and the measured diameter at a certain number of rotations, the thread tension, that is, the thread tension corrects the increase in the diameter, and thus consistently obtains the same thread layer density. To be

FIG. 4 shows a video camera as the measuring device 11 '.
26 is specifically shown. It is mounted in the end flange 8. When the shooting area of the video camera 26 is covered with the thread layer 7, it means that the desired specific number of rotations is obtained.

In FIG. 5, the measuring device 11 ″ is attached to the band 7
As a non-contact type switch 27, that is, for example, a capacitance type or inductive type switch is provided. Similar to the photoelectric barrier type sensor of FIG. 3, this is configured to be capable of reciprocating on the track 28 during measurement.

Without departing from the basic idea of the present invention,
The illustrated embodiment can be modified in various ways. For example, the table in the storage device 21 can be formed by storing a program relating to a calculation procedure for calculating a required diameter value for each rotation speed of the warp beam. In the yarn tension device, a braking device capable of changing the braking force depending on the command signal from the command line 24 may be attached to the warping drum 1.

[0022]

According to the present invention, more uniform warping can be performed on the worm beam than the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic side view of a rewinding device for a rough winding warper according to the present invention.

FIG. 2 is a schematic plan view of the rewinding device shown in FIG.

3 is a partial schematic view showing one embodiment of a diameter measuring device used in the rough winding warper shown in FIG. 1. FIG.

FIG. 4 is a partial schematic view showing a diameter measuring device of an embodiment different from that of FIG.

FIG. 5 is a partial schematic view showing a diameter measuring device of an embodiment different from those of FIGS. 3 and 4.

[Explanation of symbols]

 6 ... Warp beam 25 ... Thread tension device

Claims (8)

[Claims] 1. A method of rewinding a yarn into a warp beam, where the yarn is fed through a yarn tensioning device, wherein the diameter value of the yarn layer that theoretically occurs when the yarn thickness is uniform. , A table is created for each specific rotation speed of the warp beam, the diameter of the yarn layer is measured at the specific rotation speed, and the measured diameter causes a deviation from the set diameter value. A method of rewinding a thread into a warp beam, characterized in that the thread tension is corrected when 2. The table is stored so that it can be recalled, and the diameter value of the recalled table is compared with the measured diameter, and the thread tension is corrected automatically. The method described in 1. 3. The method according to claim 1, wherein the measurement of the diameter is performed in a non-contact manner. 4. The yarn is now fed to the warp beam via a yarn tensioning device.
In the rough winding warper for carrying out the method described in any one of 1), a memory for recording a table in which the diameter value of the theoretically generated yarn layer is set for each specific rotation speed of the warp beam (6) is recorded. Device (2
1) and a measuring device for detecting the actual diameter of the thread layer (11; 11 ';
11 "), a comparator (22) for obtaining a deviation between the measured diameter and the set diameter value, and an adjusting device (23) for changing the yarn tension by a yarn tension device (25). Aramaki warping machine characterized by that. 5. A digital computer (16) is provided, said digital computer (16) having said storage device (21), forming said comparator (22) and said adjusting device (23). The warp winding warper according to claim 4, wherein the warp winding warper is automatically adjusted. 6. The photoelectric barrier type sensor is used as the measuring device (11), according to claim 4 or claim 5.
Aramaki warping machine described. 7. An electronic camera (2) as the measuring device (11 ′).
6. The rough winding warper according to claim 4 or 5, wherein 6) is used. 8. The rough winding warper according to claim 4, wherein a non-contact type switch (27) is used as the measuring device (11 ″).