JP2849383B2 - Weft insertion method in jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a jet loom that intersects and stops an electromagnetically driven weft locking member with a yarn winding surface of a winding type weft length storage device. In the weft insertion method.

(Prior Art) When the injection by the main weft insertion nozzle and the auxiliary nozzle for weft insertion is performed at the same machine rotation timing as during the normal operation during the rising period from the start of the loom operation to the rotation speed during the normal operation, the injection is performed. The length of time causes a yarn breakage, and the injection timing of the main nozzle for weft insertion and the auxiliary nozzle for weft insertion is shifted to easily cause a weft insertion error. The inventions for solving this inconvenience are disclosed in JP-A-60-71740 and JP-A-62-206053. In each of these inventions, when the machine is started, the injection start timing of the weft insertion main nozzle is delayed from that in the normal operation, and the weft withdrawal timing from the weft measuring and storing device is delayed.

(Problems to be Solved by the Invention) Even when the injection start timing of the weft insertion main nozzle is delayed, the separation timing of the weft locking member from the yarn winding surface is the same as in the normal operation, and Is released from the locking action of the weft locking body before the start of weft insertion. In such a released state before the start of weft insertion, a breeze action to adjust the yarn end posture in the main nozzle for weft insertion,
Alternatively, the weft injecting operation performed immediately before the release of the weft lock causes the leading end of the weft to be blown out from the main weft insertion nozzle by more than a required length before the start of weft insertion, resulting in poor yarn end posture.
Further, there is a possibility that the winding yarns are entangled with each other on the yarn winding surface.
For this reason, the leading end of the weft injected from the weft insertion main nozzle may come into contact with the warp, leading to a weft insertion error.

Japanese Patent Application Laid-Open No. 62-206054 proposes that, in addition to delaying the injection start timing at the weft insertion main nozzle, advance the injection start timing at the downstream weft insertion auxiliary nozzle, but this also starts the weft insertion. No contribution can be made to ensuring a good thread end posture at the time.

(Means for Solving the Problems) For this purpose, in the present invention, when the weft is inserted by the auxiliary nozzle group that performs the main nozzle and the relay injection, the yarn winding surface of the winding type weft measuring and storing device and the weft locking are performed. In a jet loom that draws out and stops the weft from the weft length storage device by crossing and separating from the body, when the loom starts, the injection start timing and the injection end timing of the main nozzle and the auxiliary nozzle group are delayed by a predetermined angle from the normal. In addition to the delayed injection start timing and the delayed injection end timing, the separation timing of the weft locking body from the yarn winding surface is delayed from the delayed injection start timing of the main nozzle.

(Operation) At the time of starting the loom, if the injection timing of the main nozzle and the auxiliary nozzle group, that is, the injection start timing and the injection end timing are set to the delayed injection start timing and the delayed injection end timing delayed by a predetermined angle from the normal, the weft The flight timing coincides with the injection timing of the auxiliary nozzle group that performs the relay injection, and the flight of the weft is favorably maintained during high-speed operation. Further, if the separation timing of the weft locking body from the yarn winding surface is delayed from the delayed injection start timing of the main nozzle, the weft flight timing due to this delay effect is reduced when the machine starts up at a lower speed than during normal operation. Synchronizes precisely with the machine rotation timing. Therefore, the posture of the weft tip is stabilized by the main nozzle jet airflow prior to the separation timing of the weft locking body, thereby preventing a weft insertion error due to the warp entanglement of the weft tip. Also, during the delay time until the jet of the main nozzle exerts a traction force on the weft, the weft is locked by the weft locking body, so that the winding posture on the winding surface is not disturbed. Is done.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a weft measuring and storing device of a known winding type, in which a weft Y introduced from a rotation support tube 2 to a yarn winding tube 3 receives a locking action of a weft locking body 4a driven by an electromagnetic solenoid 4. While being wound around the yarn winding surface 5a of the drum 5. As shown in FIG. 2, the electromagnetic solenoid 4 is excited at a predetermined machine rotation angle position X1 during normal operation by a control command of the machine control computer C, and the machine control computer C is a rotary for detecting the machine rotation angle. An excitation of the electromagnetic solenoid 4 is commanded based on a detection signal from the encoder 6. As a result, the weft locking body 4a is separated from the yarn winding surface 5a, and the stored weft on the drum 5 is released from the locking action of the weft locking body 4a.

The weft Y released from the locking action of the weft locking body 4a is ejected by the compressed air jet from the weft insertion main nozzle 7, and a plurality of weft insertion auxiliary nozzle groups 8, 9, 10, 11, 12, 13, 13. , 14,1
Inherited to 5 relay injection. The pressurized air injection in the weft insertion for the main nozzle 7 is controlled by opening and closing of the electromagnetic valve V _0, pressure air jet of the auxiliary nozzle groups 8-15 for weft insertion solenoid valves _{V 1, V 2, V 3} , V 4, V ₅ , V ₆ , V ₇ , and V ₈ are controlled by opening and closing. Each of these electromagnetic valves V ₀ , V _{1 to} V ₈ is controlled to open and close by a control command from a machine control computer C, and the machine control computer C receives the electromagnetic valves V ₀ , commanding the opening and closing of the V ₁ ~V _8. Thereby, the auxiliary nozzle group for weft insertion 8 to 15
Performs a relay injection from the weft insertion main nozzle 7 side.

Weft insertion main nozzle 7 and weft insertion auxiliary nozzle group 8
The weft yarn Y unwound from the drum 5 due to the ejection action of Nos. To 15 is detected by the weft unwind detector 16, and when the detected number of unwinds reaches the set number n, the machine control computer C deactivates the electromagnetic solenoid 4. And the weft locking body 4a intersects with the yarn winding surface 5a. Thereby, the insertion of the weft Y is stopped. When the weft Y reaches the predetermined weft insertion position, it is detected by the weft detector 17, and the machine control computer C commands the continuation of the loom operation based on the weft presence detection signal. When the weft Y is not detected by the weft detector 17, the machine control computer C instructs the loom operation to stop.

A curve D shown in FIG. 2 shows an excitation demagnetization signal of the electromagnetic solenoid 4. Block M indicates the injection timing of the weft insertion main nozzle 7 during normal operation, and blocks S1, S2, S
3, S4, S5, S6, S7, and S8 indicate the injection timings of the weft insertion auxiliary nozzle groups 8 to 15 during normal operation. That is, the machine control computer C instructs the electromagnetic solenoid 4 to be excited at the machine rotational angle position X1 during normal operation, and when the detected number of weft unwinds from the weft unwind detector 16 reaches the set number n. to direct the demagnetization of the electromagnetic solenoid 4, it commands the opening and closing of the electromagnetic valve V _0, V ₁ ~V ₈ with at the injection timing. As a result, the weft Y shows the flight shown by the curve E, the weft Y starts weft insertion at the machine rotation angle position X1, and the machine rotation angle position
Weft insertion ends at X2.

Curve D1 shown in FIG. 2 is the electromagnetic solenoid 4 when the loom is started.
Block m shows the injection timing of the weft insertion main nozzle 7 when the loom is started, and blocks s ₁ and s
_{2, s 3, s 4,} s 5, s 6, s 7, s 8 shows the injection timing at the time of the loom starts the weft insertion auxiliary nozzle groups 8-15. That is, the third
As shown in the flow charts of FIGS. 7A and 7B, the machine control computer C instructs the excitation of the electromagnetic solenoid 4 at the machine rotational angle position θ2 in response to the ON signal of the start button 18 and the weft release. When the detected number of weft unwinds from the yarn detector 16 reaches the set number n, the demagnetization of the electromagnetic solenoid 4 is commanded, and the timings [θ1, θ3], [α1, β1], [α2, β
2], [α3, β3], [α4, β4], [α5, β5],
[Alpha6, .beta.6], [[alpha] 7, beta7], [[alpha] 8, beta 8] commands the opening and closing of the electromagnetic valve V _0, V ₁ ~V ₈ with at. As a result, the weft Y shows the flight shown by the curve E1, the weft Y starts weft insertion at the machine rotation angle position θ2, and ends weft insertion at the machine rotation angle position X3.

At the start of the machine stand, the weft insertion injection of the main nozzle 7 for weft insertion at the stand-up of the machine is performed by delaying the separation start timing θ2 of the weft locking body 4a from the yarn winding surface 5a later than the separation start time X1 during normal operation. Release of the previous winding thread is avoided. Therefore, the yarn end posture of the weft insertion main nozzle 7 at the start of the weft insertion injection is kept good, and the entanglement of the yarns on the yarn winding surface 5a is avoided. Thereby, the leading end of the weft yarn Y jetted from the weft insertion main nozzle 7 shows a good flight without contact with the warp yarn, and a weft insertion error is prevented.

In this embodiment, the injection timing of the main nozzle 7 for weft insertion and the auxiliary nozzle groups 8 to 15 for weft insertion is performed by the weft locking member.
By delaying in accordance with the separation timing of 4a, the flight timing of the weft Y and the ejection timing of the auxiliary nozzle groups 8 to 15 for weft insertion accurately match, and the flight of the weft Y during high-speed operation is improved. Will be kept.

The present invention is, of course, not limited to the above embodiment. For example, as disclosed by the present applicant in Japanese Patent Application Laid-Open No. Sho 62-33848, the crossing and separation of the yarn winding surface and the weft locking member are performed. The cam lever for attaching the weft locking body of the cam mechanism that controls switching in synchronization with the table rotation can be regulated and held at the forward position by a linear actuator such as an electromagnetic solenoid or an air cylinder.When the loom starts, the cam lever is regulated to the forward position. In addition, an embodiment in which the cam lever is switched to the forward movement position at a predetermined machine rotation angle position (θ2 in the above embodiment) is also possible.

In addition, as disclosed in Japanese Patent Publication No. Sho 60-50899, when the loom is started, the drive voltage to the loom drive motor is temporarily increased to start, or the case where the loom is started at the rated voltage during normal operation is selected. It is also possible to apply the present invention to: In other words, if the amount of delay of the separation timing can be selected according to the difference in the start-up method, good weft flight can be achieved in both the overvoltage start-up method that shows a sharp rise and the rated voltage start-up method that shows a relatively gentle rise. Running can be achieved.

(Effects of the Invention) As described above in detail, according to the present invention, when the loom is started, the injection start timing and the injection end timing of the main nozzle and the auxiliary nozzle group are delayed by a predetermined angle from the normal injection start timing and the delay injection. Since the end timing is set, it is possible to match the flight timing of the weft with the injection timing of the auxiliary nozzle group that performs the relay injection, and it is possible to keep the flight of the weft well during high-speed operation. Further, since the timing of separating the weft locking member from the yarn winding surface is delayed from the timing of starting the delayed injection of the main nozzle, the attitude of the weft tip is changed by the main nozzle injection airflow prior to the separation timing of the weft locking member. It is stable and can prevent weft insertion error caused by the warp entanglement of the weft end, and the weft is locked by the weft locking body during the delay time until the jet flow of the main nozzle actually exerts traction force on the weft. Therefore, disturbance of the winding posture on the yarn winding surface can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention, FIG. 2 is a graph showing a weft insertion state, FIG.
(B) is a flowchart showing weft insertion control when the loom is started. Weft length storage device 1, electromagnetic solenoid 4, weft anchor 4
a, yarn winding surface 5a, machine control computer C, weft Y.

Continuation of the front page (56) References JP-A-62-53446 (JP, A) JP-A-60-71740 (JP, A) JP-A-62-206053 (JP, A) , U) Real opening 1986-180183 (JP, U)

Claims (1)

(57) [Claims] When a weft is inserted by a main nozzle and a group of auxiliary nozzles for performing a relay injection, a weft length measurement is performed by intersecting and separating a yarn winding surface of a winding type weft length storage device and a weft locking body. In the jet loom for pulling out and stopping the weft from the storage device, when the loom is started, the injection start timing and the injection end timing of the main nozzle and the auxiliary nozzle group are delayed by a predetermined angle from the normal timing, and the delayed injection start timing and the delayed injection end timing A weft insertion method in a jet loom in which the timing of separating the weft locking body from the yarn winding surface is delayed from the timing of starting the delayed injection of the main nozzle.