JPS61225349A - Wefting apparatus of fluid jet type loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention involves winding and storing a weft yarn around a drum using a winding guide that rotates relatively around the drum, and a locking mechanism disposed on the weft insertion nozzle side of the drum. Regarding a weft insertion device for a fluid jet loom, which controls the start of weft insertion and regulation of the weft insertion length for one weft insertion by moving the weft body in and out at a predetermined timing, in particular, weft insertion 1 using a locking body The present invention relates to a weft insertion device that can reliably regulate the length of each weft insertion.

(Prior Art) As a conventional weft inserting device for a fluid injection type m-machine, for example, a device described in Japanese Patent Application Laid-open No. 174654/1983 is known.

To explain this with reference to FIG. 6, a gear 3,
A winding guide 5 driven via the yarn feeder 4 rotates and winds the weft yarn W from the yarn feeder around the drum 1. Then, by turning on and off the drive motor 2 while detecting the amount of weft W stored on the drum 1 using a storage amount detector (not shown), the amount of weft W for one or more weft insertions is stored in the drum 1 at all times. Then, the locking body 7 is driven in and out of the hole 6 on the front end side of the drum 1 by a cam or an electromagnetic actuator, and by pulling out the locking body 7 from the hole 6, the weft yarn W is passed through the guide 8.
The weft yarn W is
While unwinding the drum L, pull it out and insert the weft, and lock the locking body 7.
By causing the weft W to enter the hole 6, the weft W is locked, unwinding is stopped, and weft insertion is completed. In addition to the main nozzle, an auxiliary nozzle may be used as the weft insertion nozzle.

<Problems to be Solved by the Invention> However, in such a conventional weft insertion device of a fluid jet loom, the weft insertion length for one weft insertion can be obtained by unwinding the weft from the drum six times, for example. In this case, the locking body must plunge into the hole between the end of the fifth rewind and the end of the sixth rewind, and even if it is set in advance to plunge in at a predetermined timing, weft insertion will not be possible. When the conditions change, the timing of rewinding is shifted and the rewinding occurs before the end of the fifth rewinding or after the end of the sixth rewinding, resulting in insufficient or excessive weft insertion length.

In other words, conventionally, the weft insertion force of the weft insertion nozzle is always constant, so if the weft package changes, or the weft insertion force is the same at the beginning and end of use of the weft package, the properties of the weft or winding may change. Since the return resistance changes, the weft insertion conditions will not be the same.

For example, to explain the case where the weft yarn package has changed, the weft yarn A that was originally used was unwound at the timing shown in Fig. It is assumed that the setting is midway between the end of winding and the end of the sixth unwinding, and after this the package changes and becomes weft B, and the weft is unwinded early as shown in Figure 7-0. In this case, the sixth rewind has already been completed at the same timing when the locking body enters, and the locking body enters after the seventh rewinding starts, resulting in a longer weft insertion length. When the weft insertion length becomes longer in this way, there is a problem in that sufficient traction is not performed on the opposite side of the weft insertion, resulting in weaving flaws.

Therefore, it is possible to control the pressure of the fluid supplied to the weft insertion nozzle so that the timing of rewinding is constant, but even then, the interval between each rewinding is extremely short. Yes, when the locking body is driven by an electromagnetic actuator, it is necessary to set the entry timing by taking into account the variation in the activation delay time.
The setting range for the entry timing is extremely narrow, and unexpected variations may cause the entry timing to go out of order.

The present invention has been made in view of these conventional problems, and an object of the present invention is to facilitate the setting of the entry timing of the locking body and to reliably regulate the weft insertion length for one weft insertion. do.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an unwinding detector that detects the timing of a predetermined unwinding of the weft yarn from the drum, and a detected timing of unwinding. A control device is provided for controlling the pressure of the fluid supplied to the weft insertion nozzle so that the timing of rewinding matches the reference timing by comparing the rewinding timing with the reference timing, and also subtracts 1 from the number of times of rewinding corresponding to one weft insertion. The structure is such that the supply of pressure fluid to the weft insertion nozzle is stopped near the timing of unwinding the number of times.

In the above configuration, first, the unwinding detector and the control device control the pressure of the fluid supplied to the weft insertion nozzle even if the weft package is changed, and the weft insertion force is changed so that the weft is inserted every time. The timing of rewinding is almost constant. Moreover, if the number of times of rewinding for one weft insertion is N, then N-1
Since the pressure air supply to the weft insertion nozzle is set to stop at the end of the weft rewind, the interval from the end of the N-1st rewind to the end of the Nth rewind is longer than the other Even if there is unexpected variation, the relationship between the number of rewinds and the entry timing will not deviate, and the weft insertion length for one weft insertion can be reliably regulated.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 5.

Referring to FIG. 1, the basic configuration of the weft length measuring and storage device is the same as that of the conventional example (FIG. 6), so the same parts are given the same reference numerals and the explanation will be omitted.

The main nozzle 9 is supplied from a pressurized air supply source with an electro-pneumatic proportional valve 11 that has the function of adjusting the air pressure to be proportional to an electrical signal, an air tank 12 for stabilizing the pressure, and a valve that is opened when the loom start preparation switch is turned on. Pressurized air is supplied through an electromagnetic shutoff valve 13 that is closed when the weaving cycle is stopped, and an on-off valve 14 that is opened at a predetermined time of the weaving cycle, that is, at the weft insertion time.

Here, the electro-pneumatic proportional valve 11 is controlled by a voltage signal from a control circuit 24, which will be described later. Note that the electro-pneumatic proportional valve 11 and the control circuit 24 constitute a control device.

The on-off valve 14 has its valve body 15 in contact with one end of a crank lever 17 that is rotatably supported on a fixed shaft 16, and the crank lever 17 is biased by a spring 18 to cause a cam follower 19 at the other end to rotate on the loom. It is opened and closed by the cam 21, which is brought into contact with a cam 21 fixed to a rotating shaft 20 that rotates in synchronization with the main shaft.

This cam 21 includes a cam plate 21A fixed to the rotating shaft 20, and a cam plate 21A fixed to the cam plate 21A with bolts 22.
It is closer to B. These cam plates 21A, 21B have high parts 21AH, 21BH and bottom parts 21AL, respectively.
21BL is formed. The bolt 22 insertion hole of the cam plate 21B is a long hole 23 having an arc shape in the rotation direction, and the high portions 21AH and 21BH are formed in the range of this long hole 23.
By adjusting the degree of overlap with the opening/closing valve 14, the opening/closing timing of the opening/closing valve 14 can be adjusted.

The control circuit 24 includes a rewind detector 25 as a control input.
, a signal from the angle sensor 26 , and a signal from the presetter 27 are input.

The unwinding detector 25 detects the passage of the weft yarn W being rewound around the drum during weft insertion, and includes an optical fiber having a light projection surface 28 as shown in FIG.
Optical fibers having a light-receiving surface 29 are bundled, and their projection and light-receiving surfaces 28 and 29 are connected to the main nozzle 9 from the locking body 7 of the drum 1, as shown in FIG.
In addition, it is opposed to a portion immediately in front of the locking body 7 in the unwinding direction of the weft W (direction R in FIG. 3). The drum 1 is made of aluminum, and its surface is coated with ceramic spraying to prevent the weft W from slipping.
Regarding the portion of the drum 1 facing the projection/reception surfaces 28 and 29, the ceramic spraying is removed to expose the aluminum surface, which is then puff polished to a mirror surface 30.

In this way, the light projected from the light emitting surface 28 is normally reflected by the mirror surface 30 of the drum l and enters the light receiving surface 29, and as the weft W is unwound, the weft W is transferred to the light emitting and light receiving surface 29. 29 and the mirror surface 30, the light beam is blocked and the amount of light incident on the light receiving surface 29 is reduced, and this is used to detect the passage of the weft W. Incidentally, when the number of unwindings N corresponding to one weft insertion is six, the detection signal due to the passage of the weft W is obtained every time the weft is unwound one round, so it can be obtained six times until the weft insertion is completed. A selected one of them is used for control.

The angle sensor 26 is attached to a rotating shaft 31 that rotates in conjunction with the main shaft of the loom, and is opposed to a rotating body 32 having 360 protrusions around the periphery.

Each time a convex portion is detected, a main shaft angle signal is output that is counted up by 1°, and after 359°, a main shaft angle signal of 0° is output.

The presetter 27 is provided to preset information necessary for control by the control circuit 24.

Here, the control circuit 24 uses a built-in microcomputer to perform predetermined processing in accordance with the flowchart shown in FIG.
The operation of the pneumatic proportional valve 11 is controlled to control the supply pressure to the main nozzle 9.

Next, the operation of this system will be explained with reference to the flowchart shown in FIG.

When the power of the loom is turned on, initial settings are performed (Step 11 in the figure). That is, the number of times n (for example, the fifth time) of the rewinding detection signal to be selected, the reference spindle angle T0. Set the allowable range LM and initial pressure V to those used last time. The initial pressure (2) is set to the pressure V immediately before the previous stop, and its digital value is converted into an analog voltage by an A/D converter and output to the electro-pneumatic proportional valve 11. Further, cumulative values ΣΔT and ΣP, which will be described later, are set to 0.

Next, it is determined whether the information from the presetter 27 is in the reading state a (the input switch provided on the presetter 27 is ON) or not (Step 2). The number of times n of the input rewinding detection signals to be selected, the reference spindle angle T0 . Tolerance range LM.

Read the initial pressure ■ and change the settings (Step 3)
.

When the loom starts operating, control is started based on a determination as to whether the operation switch is ON (step 4).

That is, when the weft W is unwound from the drum 1 during weft insertion, a preselected signal from the unwinding detector 25 that is generated every time the weft W is unwound one round, for example, the fifth signal is input. The current main axis angle T is read based on the signal from the angle sensor 26 (step 5.6). Then, subtract the reference spindle angle T0 from the spindle angle T to find the difference (T - To), calculate the cumulative value ΣΔT of the difference, and at the same time, calculate the number of picks since the start of accumulation Σ
The value of P is increased by 1 (step 7).

Next, it is determined whether the cumulative value ΣΔT of the difference (T-TO) exceeds the tolerance range LM (for example, ±100) on the plus or minus side (step 8.9).

If the allowable range on the positive side is exceeded, divide the current pressure (or the initially set initial pressure) by the pink number ΣP until the allowable range is exceeded, and add this to the current pressure V.
A new pressure V is set (step 10).

If the negative tolerance is exceeded, divide the current pressure ■ by the number of picks ΣP until the tolerance is exceeded, subtract this from the current pressure V, and set a new pressure V (
Step 11).

The pressure V thus newly set is output to the electro-pneumatic proportional valve 11 via the D/A converter. At the same time, ΣΔT and ΣP are cleared (step 12).

In this way, if the cumulative value ΣΔT of the difference between the spindle angle T and the reference spindle angle T0 at the timing of the fifth rewind exceeds the positive tolerance range LM, the weft insertion time is too long, so Depending on the number of picks ΣP required,
The supply pressure V to the main nozzle 9 is increased, the traction force is increased, and the timing of rewinding is optimized.

On the other hand, if the negative tolerance range - LM is exceeded, the weft insertion time is too short, and the number of picks required for wefting is
Decrease the supply pressure V to the main nozzle 9 by an amount corresponding to P,
Reduce the traction force and optimize the timing of rewinding.

Of course, if the pressure is within the allowable range, the previous pressure is continued.

In this way, the timing of the fifth unwinding from the drum 1 is controlled to the predetermined reference main axis angle, but the air injection from the main nozzle 9 is controlled by the high part 21AH and 21811 of the cam 21. Adjust the overlap using long hole 23.
By adjusting within the range of 5, as shown in Fig.
The opening/closing valve 14 is set to close at the timing when the first rewinding is completed, and air injection from the main nozzle 9 is stopped.

As a result, after the fifth unwinding is completed, weft insertion is carried out by the air jet of only the auxiliary nozzle, or if the auxiliary nozzle is not used together, the weft is inserted only by the inertia of the weft W. The time required for rewinding in between is longer.

Therefore, the timing of the end of the fifth rewind is controlled to be almost constant, and the time from the end of the fifth rewind to the end of the sixth rewind is long.
It becomes easy to set the plunge timing of the locking body 7 during the weft insertion, and even if there is an adjustment error, the number of rewinding times and the plunge timing of the locking body 7 do not deviate.
It is possible to reliably regulate the weft insertion length of each batch.

In this embodiment, the opening valve 14 that controls the air injection of the main nozzle 9 is driven by the cam 21, and the end timing of air injection is manually set by the cam 21. 14 may be an electromagnetic opening/closing valve, and the valve may be automatically closed when the control circuit 24 detects the timing of the fifth rewind.

Further, in this embodiment, the timing of the fifth rewinding is controlled to be constant, but the timing of the sixth or final rewinding may be controlled to be constant.

In this case, instead of the unwinding detector 25, a strain gauge is attached to the side wall of the locking body 7 to detect the timing at which the weft yarn W is locked to the locking body 7 when the weft W finishes flying. You may also do so.

Further, the locking body 7 may be driven mechanically by a cam or the like, or may be driven using an electromagnetic actuator. The winding guide 5 may be driven by the main shaft of the loom.

Furthermore, a plurality of rollers of the drum of the weft length measuring and storage device may be arranged in a frame shape. Further, the locking body may protrude and retract from the drum surface from the inside of the drum. Alternatively, the drum may be rotated and the winding guide may be fixedly arranged to wind the weft yarn around the drum.

<Effects of the Invention> As explained above, according to the present invention, while it is easy to set the entry timing of the locking body, the weft insertion length for one weft insertion can be reliably regulated, and the weft insertion performance can be improved. The effect is that it can be improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is an enlarged view of a rewind detector, FIG. 3 (2), 0 is a front view and a side view showing the layout of the rewind detector, Figure 4 is a flowchart showing control details, Figure 5 is a timing chart,
FIG. 6 is a configuration diagram of a conventional device, and FIG. 7 is a timing chart showing problems with the conventional device. 1... Drum 5... Winding guide 7... Locking body 9... Main nozzle 11... Electric-pneumatic proportional valve 14... Opening/closing valve 21... Cam 24...
Control circuit 25... Rewinding detector 26... Angle sensor 27... Presetter patent applicant Nissan Motor Co., Ltd. agent Patent attorney Fujio Sasashima Figure 2 Figure 3 (A) (B)

Claims (1)

[Claims] The weft yarn (W) is wound around the drum (1) and stored by a winding guide (5) that rotates relatively around the drum (1), and a lock is placed on the weft insertion nozzle (9) side of the drum (1). body(
7) from the drum surface, the weft insertion nozzle (9)
) is used to unwind the weft yarn (W) from the drum (1) while inserting the weft yarn, and by causing the weft yarn (W) to enter the drum surface, the weft yarn (W) is locked and the weft insertion is completed. In the weft insertion device of the loom, a rewind detector (25) detects the timing of rewinding the weft (W) for a predetermined time from the drum (1), and the detected rewinding timing is compared with a reference timing. A control device (11, 24) is provided to control the pressure of the fluid supplied to the weft insertion nozzle (9) so that the timing of rewinding coincides with the reference timing, and the control device (11, 24) controls the pressure of the fluid supplied to the weft insertion nozzle (9) so that the timing of rewinding coincides with the reference timing. A weft insertion device for a fluid jet loom, characterized in that the supply of pressure fluid to a weft insertion nozzle (9) is stopped near the timing of unwinding the number of times minus 1.