JP2900057B2 - Knitting yarn detection method for warp knitting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a knitting yarn detecting method in a warp knitting machine.

[Conventional technology and its problems]

Conventionally, knitting yarn composed of ground yarn or patterned yarn in a warp knitting machine is warped into a bobbin called a beam, installed on the knitting machine, and supplied to a knitting needle in synchronization with knitting. If the unwound amount is reduced and the knitting is continued, the yarn is detached from the beam, and the knitted yarn having a released tension may cause breakage of a knitting element such as a knitting needle. For this reason, when the winding amount is reduced, the operator must always pay attention to whether the knitting yarn is lifted, and must stop the knitting machine where the remaining amount is as small as possible and does not hinder knitting. In actuality, the stop timing is determined by the operator visually checking the remaining thread state and performing the stop operation based on his / her own experience and intuition. On the other hand, in some warp knitting machines, knitting yarn is sent out by computer control,
In this case, it is necessary to separately set a system as a beam control device. In addition, a sensing arm is provided in contact with the winding thread of the beam so as to be in contact therewith, and sensing is performed by using an exposed portion of the metal surface of the beam when the yarn is almost up.
As shown in -39738, in this case, it is limited to a beam with a patterned yarn, and since it is a method of contacting the patterned yarn, the effect on the beam rotation is inevitable, and this is a slight fluctuation in tension. There was thought to lead to. In the case of ground yarn, the warping pitch was fine, so that this method could not be practically adopted.

The present invention solves the above drawbacks, without contact with the winding of the beam, when the lint thickness of the winding is minimized, that is,
It is intended to provide a knitting yarn rising detection method in a warp knitting machine capable of detecting when the yarn is used to the maximum extent and issuing a warning, or in some cases, stopping the knitting machine operation. .

[Means for solving the problem]

In the knitting yarn rising detecting method in the warp knitting machine according to the present invention, a distance sensor including a light projecting unit and a light receiving unit is disposed so as to be directed in the axial direction of the bobbin beam, and a minimum remaining yarn amount is previously set in the empty beam. The imaging position of the projected light beam at the light receiving unit corresponding to the distance from the total surface of the wound yarn to the sensor with the addition of is set, and when the imaging position during knitting reaches the set position, the yarn rise is detected. A signal is issued, and a warning is issued based on the signal, or the operation of the knitting machine is stopped.

[Action]

When the knitting yarn is reduced by knitting and reaches the above set distance, the light is reflected through the winding layer surface and the position detecting element of the light receiving unit detects that the set distance has been reached, and this detection signal is output. Is notified to the operator by a warning means such as a buzzer or a lamp, and the operation of the knitting machine is stopped if necessary.

〔Example〕

Next, an embodiment of the detection method of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a warp knitting machine used to carry out a knitting yarn rising detecting method. This warp knitting machine is called a tricot machine, and guides a knitting yarn 1 to a needle row 2. Guide bar 3
However, two to several sheets are usually used. Numeral 4 denotes a sectional beam, and as shown in FIGS. 2 and 3, a warp is divided into several sectional beams according to the knitting width, warped and set on the machine. Reference numeral 5 denotes a distance sensor, which is attached to a holding rod 7 supported by the machine frame 6 via a sliding arm 8. Are arranged in the direction of the axis O of the sectional beam. The mounting state of this sensor 5
A sliding arm 8 whose setting position is adjustable according to the winding diameter of the sectional beam 4 is provided so as to be able to move on the holding rod 7. Also, as shown in FIGS. 2 and 3, the support arm 11 is slid and raised with respect to the holding rod 7 so as to correspond to various sizes of the body 9 and the flange 10 of the sectional beam 4. It can be provided so that it can be defeated.

The distance sensor 5 set on the knitting machine is
As shown in the figure, the light projecting unit 12 and the light receiving unit 13 are included in a unit 14, and a light projecting beam 15 composed of infrared rays from the light projecting unit 12 is
The light passes through the aspherical light projecting lens 16, is reflected by the outer surface portion 18 of the winding thread layer 17, and the reflected light 15 'passes through the aspherical lens 19 and is received by the light receiving portion.
An image is formed at the point S of the position detecting element 20 constituting 13. Then, as the knitting proceeds, the winding layer 17 gradually decreases and the image moves in the direction of the point E, and when the image reaches the outer surface portion 18 'of the minimum winding layer with respect to the preset imaging position of the point E, Reflected ray 1
5 "forms an image at the point E on the position detecting element 20. The signal detected at this time is supplied to the amplifier via the detecting circuit 21 as shown in FIG.
An alarm lamp 24 is turned on or an alarm buzzer 25 is sounded from an alarm generation circuit 23 through an alarm generation circuit 23 to notify the worker that the yarn is almost up. In some cases, a signal is sent to the motor control circuit 26 to stop the motor 27 for driving the knitting machine.

(Example data) Beam size 21 "x 21" (length 21 "x flange diameter 21")
Using a denim 30 denier yarn, a monofilament yarn 30 denier polyad yarn, and a monofilament yarn, set the distance sensor and set the remaining yarn thickness to 0.5 mm. Was carried out, a warning was issued when the remaining yarn amount was about 5 m to 8 m. or,
A test was conducted with the monofilament colored black. Under the same conditions, although the amount of remaining yarn increased slightly, if the set value was made a little smaller, it was possible to detect the same amount of remaining yarn.

In the above embodiment, the distance sensor is of an optical type and is based on the emission and reception of infrared rays. However, in addition to this, an ultrasonic type is used, and the ultrasonic waves generated from the ultrasonic generation unit of the sensor are applied to the surface of the winding layer. The time until the reflected wave obtained through the receiving unit is received by the receiving unit may be set corresponding to the detection distance in which the minimum amount of remaining yarn is added to the empty beam in advance, as in the above embodiment.

As described above, in the case of using the ultrasonic wave, there is an advantage that the setting can be made completely independent of the color of the winding thread.

〔The invention's effect〕

According to the detection method of the present invention, the knitting of the beam
Since the detection is based on the set distance between the surface of the winding layer and the sensor as the amount of winding decreases, the remaining amount of winding can be adjusted freely according to the setting of the distance, and knitting is performed with the minimum amount of remaining yarn. The machine can be adjusted freely, and the knitting machine can be stopped with the minimum remaining yarn amount.
Further, since the non-contact method is performed by the distance sensor including the light projecting unit and the light receiving unit, the method can be widely applied without affecting the knitting yarn regardless of the ground beam and the pattern beam.

[Brief description of the drawings]

FIG. 1 is a side view of a warp knitting machine used to carry out the knitting yarn detecting method of the present invention, and FIG. 2 shows a state where a distance sensor is attached to the warp knitting machine.
FIG. 3 is a front view of the beam portion, FIG. 3 is a perspective view of the beam portion, and FIG. 4 is a plan view in a partial cross-sectional view for explaining the relationship between the distance sensor and the winding layer of the beam. FIG. 5 is a block diagram showing a signal flow in the detection method of the present invention. Explanation of reference numerals 4 ... sectional beam 5 ... distance sener, 12 ... light emitting part 13 ... light receiving part, 14 ... single box, 15 ... light emitting ray 15 ', 15 "... light receiving line, 17 ... Winding layer 20: Position detecting element

Claims (1)

(57) [Claims] 1. A distance sensor including a light projecting part and a light receiving part is disposed so as to be oriented in the axial direction of a bobbin beam. The imaging position of the projected light beam at the light receiving unit corresponding to the distance is set in advance, and when the imaging position reaches the set position during knitting, a yarn rise is detected and a signal is issued, and a warning is issued based on this signal. A knitting yarn rising detection method in a warp knitting machine, wherein the knitting machine emits or stops the operation of the knitting machine.