JPH0674537B2 - Measuring method of weft thread in jet turm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the measurement and storage of weft yarns by the engagement and disengagement of the yarn winding surface forming body for winding the weft yarns and the weft locking body, and the yarn winding surface. The present invention relates to a weft measuring method in a jet loom using a weft measuring and storing device for controlling the pulling out of the machine, and more specifically to a weft measuring length control during low speed rotation during start-up or inching operation of a machine base. .

(Prior Art) As a weft measuring and storing device of this kind, the operation of the weft locking body is mechanically connected to a machine base drive source, and the machine rotation is performed by intersecting and separating the weft locking body and the thread winding surface. JP-A-59-204948 discloses a weft measuring / storing device capable of easily changing the weft measuring amount. In the latter conventional device, the bobbin winding tube for winding the weft on the drum-shaped bobbin winding surface forming body is driven by a motor different from the machine base driving motor, and the weft locking body is driven by an electromagnetic solenoid. It has become so. The bobbin winding tube drive motor is controlled in operation by a command from the control device based on a detection signal from the photoelectric tube that detects the amount of bobbin thread accumulated on the bobbin winding surface, and the electromagnetic solenoid is operated from the machine base rotation angle detector. The operation is controlled by the control device based on the detection signal. By adopting such a control system, it is possible to extremely easily change the weft withdrawing stop timing from the yarn winding surface, which leads to a change in the weft length measurement amount.

(Problems to be Solved by the Invention) However, in any of the above-described constructions of the weft measuring and storing device, the weft withdrawing stop timing due to the intersection of the weft locking body and the winding surface is regulated to a predetermined machine base rotation angle. Therefore, inconvenience occurs at the time of stand-up of the machine at a speed lower than the machine rotation speed during normal operation, during machine inching operation, and the like. That is, the weft withdrawal stop timing during normal operation is set according to the withdrawal speed of the weft that is withdrawn by the main weft insertion nozzle, and even at low speed rotation states such as when the machine stand rises and machine stand inching operation. Since the weft pull-out speed is the same as during normal operation due to the setting, the set length measurement is required until the weft locker crosses the thread winding surface when the machine stands up or when the machine is running at low speeds such as inching. In some cases, a weft amount larger than at least one roll may be drawn. This is because the weft withdrawing speed varies and cannot be covered with the set weft withdrawal stop timing during normal operation. Such an excessive weft insertion amount not only results in weft loss but also becomes unnecessarily long. The sewage selvage part enters the warp opening and is woven into the woven fabric, resulting in a fabric defect.

Configuration of the Invention (Means for Solving the Problems) Therefore, in the present invention, the weft length measurement storage and the weft length measurement storage are performed by the engagement and disengagement action of the weft locking body driven by the electromagnetic solenoid and the yarn winding surface forming body that winds the weft. In a jet loom equipped with a weft length measuring device for controlling the withdrawal from the bobbin winding surface, the operation timing of the weft thread locking body at least during start-up of the machine and during low speed rotation during machine inching operation during normal operation The weft pull-out start angle that is the same as the above and the weft pull-out stop angle that is almost the same as the weft release time during normal operation are input to the control device in advance, and the weft lock body is based on the machine drive signal during the low speed rotation. Is selected by the control device, and the starting angle of the weft drawing by the weft locking body after the predetermined machine frame driving signal is transmitted is made the same as the weft drawing starting angle in the normal operation. Rutotomoni than weft drawer stop angle when the weft drawer stop angle normal operation and to move the front.

(Operation) That is, at the time of starting the machine that is in a lower speed rotation state than during normal operation, and during the machine inching operation, the intersection timing angle between the weft thread locking body and the thread winding surface is the machine start signal. , Based on a predetermined signal such as the machine base inching signal, it is shifted to the front side of the intersection timing angle position during normal operation, and the weft thread locking body is seen from the scale of the machine base rotation angle compared to the case during normal operation. It quickly crosses the bobbin winding surface. Therefore, when the machine is started up, the weft that is pulled out at the same speed as during normal operation during machine inching operation must be released from the weft lock body during the same time interval as in normal operation in terms of time. And the weft thread is
Even when the machine is inching, the same amount as in normal operation is measured and weft insertion is performed.

(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS.

Annular bracket 2 fixed to the side frame 1 of the loom
A rotary support shaft 3 is rotatably mounted therethrough, and a weft guide hole 3a for guiding the weft Y supplied from the cheese 4 is formed in the shaft center portion thereof. A thread winding tube 5 is attached to the rotary support shaft 3 so as to communicate with the weft thread guide hole 3a, and its tip is open near the thread winding surface described later. A drum-shaped bobbin winding surface forming member 6 is rotatably supported at the tip of the rotary support shaft 3 and is fixed to the gear 7 and the bobbin winding surface forming member 6 fixed to the annular bracket 2. The gear 8 is meshed with the planet gears 9 and 10. Even if the rotation support shaft 3 side rotates due to this meshing relationship, the yarn winding surface forming body 6 side is held in a stationary state without rotating, and the weft Y supplied from the yarn winding tube 5 of the yarn winding surface forming body 6 is held. Circumference 6a
Wrapped around. In this embodiment, it is assumed that the length of the weft yarn per one rotation of the machine base corresponds to the length wound four times on the yarn winding surface 6a, and the length of one winding is L.

The rotation support shaft 3 is rotated by a motor 11 different from a machine base driving motor (not shown).
Is controlled by a command from the controller C.

A phototube 12 is disposed near the bobbin winding surface 6a of the bobbin winding surface forming body 6, and a weft thread locking body 14 driven by an electromagnetic solenoid 13 can cross and separate from the bobbin winding surface 6a on the front side thereof. It is installed in. The photoelectric tube 12 sends a signal current according to the amount of light reflected from the bobbin winding surface 6a to the control device C, and the control device C
Controls the operation of the motor 11 in response to a signal, and when the wound yarn storage amount becomes a predetermined amount or less, the motor 11 is rotated and the weft yarn Y is additionally supplied onto the yarn winding surface 6a. Further, the controller C controls the excitation / demagnetization of the electromagnetic solenoid 13, and the excitation / demagnetization of the solenoid 13 causes the weft thread locking body 14 to intersect with and separate from the yarn winding surface 6a.

The control device C is adapted to select the excitation timing of the electromagnetic solenoid 13 based on the activation signal S from the machine base control unit 15, and the machine base control unit 15 is based on the ON signal from the machine base start switch 16. And outputs a start signal S to the machine drive motor and the control device C. As a result, the control device C becomes an electromagnetic solenoid.
The excitation timing of 13 is selected, and this excitation timing is based on the machine base rotation angle range [α2, α1], [β2, β1], [θ
2, θ1] machine stand rotation angle α2 <α <α1, β2 <β <
.beta.1, .theta.2 <.theta. <. theta.1 are preset in the controller C, and the controller C outputs the angle detection signals S (.alpha.), S (.beta.), S (.theta.) from the machine base rotation angle detector 17. In response, the excitation of the electromagnetic solenoid 13 is commanded at the machine rotation angles α, β, θ. In this embodiment, it is assumed that the machine base rotates twice after the machine base activation signal is transmitted until the machine base shifts to the normal operation state.

Now, the machine stand is stopped with the weft thread locking body 14 intersecting the bobbin winding surface 6a as shown in FIG. 1, and the machine stand rotation angle at this time is 0 °. When the ON signal of the machine stand start switch 16 is input to the machine stand controller 15, the machine stand drive motor starts to rotate by the start signal S issued from the machine stand controller 15 and the machine stand rotation angle becomes Θ. Then, the control device C sends a demagnetization command to the electromagnetic solenoid 13. As a result, the weft thread locking body 14 is separated from the thread winding surface 6a, and the accumulated weft on the thread winding surface 6a is pulled out from the thread winding surface 6a by the injection of the weft inserting main nozzle 18. Further, the control device C selects the machine rotation angle α as the excitation timing of the electromagnetic solenoid 13 of the first cycle of the machine of the signal S transmitter based on the start signal S, and the electromagnetic solenoid 13 of the second cycle of machine rotation is selected. The machine base rotation angle β is selected as the excitation time. When the detection signal S (α) output from the machine rotation angle detector 17 at the machine rotation angle α is input to the control device C, the control device C responds to the input signal S (α) by the electromagnetic solenoid. An excitation command is sent to 13, and the electromagnetic solenoid 13 is excited at the machine base rotation angle α. Therefore, the weft thread locking body 14 intersects the bobbin winding surface 6a at the machine base rotation angle (α + Δ), and weft pulling out from the bobbin winding surface 6a is prevented.
Represents a response delay angle in the electromagnetic solenoid 13 and has a relationship of α1 <α + Δ <α2. The length of the weft that is pulled out while the weft lock body 14 intersects the thread winding surface 6 is shown by the curve D1 in FIG. 2, immediately after the machine base is started in a lower speed rotation state than in normal operation. In the first cycle of machine rotation, the weft length 3L for 3 windings is narrower than the machine rotation angle range [Θ, θ2] during normal operation.
The length 4L for one weft insertion is pulled out in the machine rotation angle range [Θ, α1] narrower than the machine rotation angle range [Θ, θ1] during normal operation. Then, the weft locking body 14
Intersects with the bobbin winding surface 6a within the machine base rotation angle range [α2, α1], the bobbin on the bobbin winding surface 6a is prevented from being pulled out after the fifth winding, and the weft Y is pulled out by 4L.

When the machine base enters the second cycle after transmitting the machine base activation signal S, the electromagnetic solenoid 13 is demagnetized at the machine body rotation angle position Θ.
As a result, the weft thread locking body 14 is separated from the thread winding surface 6a,
As shown by the curve D2 in the figure, the weft yarn Y is pulled out from the yarn winding surface 6a. When the machine rotation angle becomes β, the control device C sends an excitation command to the electromagnetic solenoid 13 in response to the input signal S (β) from the machine rotation angle detector 17, and the electromagnetic solenoid 13 causes the machine rotation angle β. Is excited at. Therefore, the weft locking body 14
Intersects the bobbin winding surface 6a at the machine stand rotation angle (β + Δ) (β2 <β + Δ <β1), and the weft withdrawing amount from the bobbin winding surface 6a is only 4L.

When the machine stand enters the normal operating state after the third cycle after the machine stand start signal S is transmitted, the weft Y is released from the weft catching body 14 at the machine rotation angle position Θ, and the curve D is shown in FIG. It is pulled out as shown in. When the machine rotation angle becomes θ, the controller C inputs the input signal S from the machine rotation angle detector 17.
In response to (θ), send an excitation command to the electromagnetic solenoid 13,
The electromagnetic solenoid 13 is excited at the machine rotation angle θ. Therefore, the weft lock 14 is rotated by the machine base rotation angle (θ + Δ) (θ2 <
When θ + Δ <θ1), it intersects the bobbin winding surface 6a, and the weft withdrawal amount from the bobbin winding surface 6a is 4L.

That is, α2, β2, and θ2 represent the machine rotation angle positions at the first cycle, second cycle, and three windings of the weft during normal operation after the machine start signal S is transmitted.
1, β1 and θ1 respectively represent the machine rotation angle position during the first cycle, the second cycle after sending the machine start signal S, and the 4th weft pull-out during normal operation, and the controller C starts the machine. In both the first and second cycles after the signal S is transmitted and in the normal operation, the crossing time between the weft-locking body 14 and the bobbin winding surface 6a is set between the pulling-out time of three windings of the weft and the drawing-out timing of four windings. Control the machine rotation angle position (α, β, θ). As described in detail above, in this embodiment, the weft withdrawal start angle by the weft thread locking body after transmitting the machine frame drive signal is set to the same position as the withdrawal start angular position during normal operation, and the weft withdrawal stop angular position is set under normal operation. It is controlled so that the weft pull-out stop position is moved to the front side.
Therefore, the weft insertion length of the weft Y is the set length measurement 4L even when the machine stand is raised, and weft loss and fabric defect due to excessive weft insertion do not occur.

As in the conventional case, if only one intersection timing between the weft thread locking body 14 and the bobbin winding surface 6a is set within the machine base rotation angle range [θ2, α1], an excessive amount of weft insertion will occur even when the machine stand is raised. Although it does not seem to be present, an excessive amount of weft insertion may occur due to variations in weft drawing speed. Of course, also in the present embodiment, the timing of intersection between the weft thread locking body 14 and the thread winding surface 6a, which is preliminarily input to the control device C, is selected in consideration of the variation of the weft withdrawing speed and the number of windings per machine revolution. It is necessary, but the degree of freedom of choice is much higher than in the past.

Of course, the present invention is not limited to the above-mentioned embodiment, and for example, the electromagnetic solenoid 13 of the above-mentioned embodiment is controlled by timer switching, the operation of the electromagnetic solenoid 13 is program-controlled, and as shown in FIG. The weft yarn detector 19 is installed on the side of the bobbin winding surface 6a, and the number of unwinding yarns is counted by the weft yarn detector 19 only for one or two cycles immediately after the machine base start signal is transmitted. It is also possible to send an excitation command from the control device C to the electromagnetic solenoid 13 when the value reaches. Alternatively, a weft tip detector may be installed in the weaving width, and the weft catching body and the thread winding surface may intersect when the weft tip detector detects the weft tip.

Further, the embodiment shown in FIG. 4 is also possible in the present invention. In this embodiment, the rotation of the rotary support shaft 3 is converted into vertical movement of the weft thread stopper 20 in the thread winding surface forming body 6 through an appropriate mechanism (for example, a combination of a gear mechanism and a cam mechanism), and the weft threader A weft yarn locking body 14 driven by an electromagnetic solenoid 13 is arranged closer to the bobbin winding pipe 5 side than the stopper body 20, and the operation of the electromagnetic solenoid 13 is controlled by the controller C only when the machine stand is started up. That is, the weft locking body 20 in the bobbin winding surface forming body 6 always performs weft length measurement storage and pull-out control during normal operation, and the weft locking body 14 measures the weft length measurement storage and only when the machine stand is raised. Control the withdrawal.

Furthermore, the present invention can be applied to the machine inching, which is in a lower speed rotation state than in the normal operation, and the one shot weft insertion. In this case, the machine inching operation button, the one shot weft insertion The intersection between the weft thread locking body and the bobbin winding surface is controlled based on a predetermined signal transmitted by the ON operation of the operation button.

Effects of the Invention As described in detail above, in the present invention, the timing for starting the weft withdrawal by the weft catching body is set after the machine base start signal, the machine frame inching signal, etc., which is in a lower speed rotation state than in the normal operation, is transmitted. The weft pull-out stop timing is set to be earlier than the weft pull-out stop timing during normal operation, as viewed from the scale of the machine rotation angle position, so the weft pull-out length is the same as during normal operation. This enables the weft insertion to be performed stably even at low speed rotation with the warp opening state at the start of weft insertion and the position of the main nozzle for weft insertion remaining the same as during normal operation. It has an excellent effect that the weft insertion amount is not excessive and the weft loss and the fabric defect caused by the weft insertion amount are prevented.

[Brief description of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a graph showing a weft insertion state, and FIG. 3 is a side view showing another example of the present invention. FIG. 4 is a partially cutaway side view showing another example of the present invention. Bobbin winding surface 6a, electromagnetic solenoid 13, weft thread locking body 14, machine base start-up switch 16, control device C, machine base rotation angle position α,
β, θ, weft Y.

Claims (1)

[Claims] 1. A weft length measuring device for controlling the weft length measurement storage and the weft yarn length drawing control by engaging and disengaging a weft locking body driven by an electromagnetic solenoid with a weft winding surface forming body for winding the weft yarn. In a jet loom equipped with a device, at least the weft pull-out starting angle and the weft during normal operation are the same as the normal operation when the weft locking body operates at low speed during machine start-up and machine inching operation. The weft pull-out stop angle that is almost the same as the opening time is input to the control device in advance, and the operating time of the weft lock body is selected by the control device based on the machine frame drive signal during the low speed rotation. After the machine base drive signal is transmitted, the weft pull-out start angle by the weft lock body is set to be the same as the weft pull-out start angle in the normal operation, and the weft pull-out stop angle is set in the normal operation. Weft measuring method in a jet loom, wherein the transfer to the front side than the yarn drawer stop angle.