JPH0441743A - Air feeder in jet loom - Google Patents

Abstract

PURPOSE:To efficiently prevent thread cast-off by controlling air supply to the main nozzle for weft insertion and air supply for prevention of thread cast- off, using single electromagnetic valve, and carrying out weft insertion, using an air jet pressure adapted to conditions such as kind of yarn, yarn number count and rotational speed of the machine body. CONSTITUTION:An exciting.degaussing circuit for weft insertion for supplying weft insertion air and a degaussing circuit for prevention of thread cast-off for supplying thread cast-off prevention air are connected to single electromagnetic valve, attached between the main nozzle for weft insertion and an air supply tank. A timing-regulating circuit and an applied voltage-regulating circuit are incorporated in a stick circuit for supplying voltage, required for actuation of the above-mentioned electromagnetic valve. Air supply for weft insertion to the above-mentioned main nozzle and air supply for prevention of thread cast-off are carried out by excitation or degaussing of the above-mentioned single electromagnetic valve, based on direction of a regulating computer thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an air supply device for preventing thread removal in a main nozzle for weft insertion of a jet loom.

[Prior Art] A device was developed in 1972 to prevent threads from coming off from the main nozzle for inserting the weft due to the weft cutting shock after beating the reed.
It is disclosed in Japanese Patent No.-22130. In this device, the air supply path for weft insertion and the air supply path for preventing thread removal are connected to the main nozzle for weft insertion, and mechanical valves are interposed on each path, and each mechanical valve is connected to the machine drive source. The opening and closing are controlled by a cam that is operatively connected.

[Problems to be Solved by the Invention] However, in air supply control using a mechanical valve, it is difficult to perform appropriate timing control according to the yarn count, yarn type, or machine rotation speed. Further, such a two-system air supply configuration has a complicated structure and is problematic in terms of cost.

Therefore, as disclosed in Japanese Unexamined Patent Publication No. 199949/1983, the present invention uses an electromagnetic valve that controls the supply of air for weft insertion to the main nozzle for weft insertion to also control the air supply for preventing thread removal. The purpose of this invention is to provide an air supply device.

[Means for Solving the Problems] To this end, the present invention supplies weft insertion air to the weft insertion main nozzle by excitation and demagnetization of a solenoid valve interposed between the weft insertion main nozzle and the air supply tank. It has a weft insertion excitation/demagnetization circuit for excitation/demagnetization of the electromagnetic valve and a thread removal prevention excitation/demagnetization circuit for supplying thread removal prevention air to the weft insertion main nozzle. is incorporated into a prevention excitation/demagnetization circuit, and a timing adjustment circuit and an applied voltage adjustment circuit are connected to a holding circuit that supplies voltage necessary for operating the electromagnetic valve, and an air supply device is installed to prevent thread removal. Configured.

[Operation] Air supply for preventing yarn breakage shock caused by weft yarn breakage after beating is carried out at least by excitation and demagnetization of the holding circuit. The electromagnetic valve is opened by the excitation action of the holding circuit, and air is supplied to the main nozzle for weft insertion to prevent thread removal. It will be done.

The holding timing of the electromagnetic valve can be adjusted by a timing adjustment circuit, and the excitation intensity of the electromagnetic valve can be adjusted by an applied voltage adjustment circuit. Therefore, by adjusting the timing and excitation intensity, it is possible to appropriately and easily set the air supply state for preventing thread removal.

[Example] Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 4.

The weft yarn Y ejected from the main weft insertion nozzle L is passed through a plurality of auxiliary weft insertion nozzle groups 2. 3. 4. If the weft insertion is performed successfully, the weft yarn Y is detected by the weft yarn detector 6 within a predetermined machine rotation angle range, and the loom operation continues. If the weft detector 6 does not detect the presence of a weft within a predetermined loom rotation angle range, the loom operation is stopped.

The main weft insertion nozzle 1 is connected to the pressure air supply tank 7 via the electromagnetic valve V1, and the auxiliary weft insertion nozzle groups 2 to 5 are connected to the pressure air supply tank 7 via the electromagnetic valves V2°Vs, V4, and Vs. 8 is connected. Each pressurized air supply tank 7.8 has a manual pressure regulator 9. It is connected to the source pressure tank 11 via lO.

The excitation/demagnetization control of each electromagnetic valve V r , V 2 to V 5 is performed by a command from the control computer C, and the control computer C controls the electromagnetic valve V 1 . Commands excitation and demagnetization of V2 to V5. This command data is input and set to the data memory RAM via the central processing unit CPU of the control computer C, and the central processing unit CPU inputs each of these data and the excitation/demagnetization control program input and set to the program memory ROM. Excitation and demagnetization control is performed based on the

An excitation/demagnetization circuit C1 for weft insertion and an excitation/demagnetization circuit C2 for preventing thread removal are connected in parallel to the electromagnetic valve V1, and an output signal S1 from the excitation/demagnetization signal generation circuit 13 is connected to the excitation/demagnetization circuit C+ for weft insertion. At the same time, the output signal S from the excitation/demagnetization signal generation circuit 14 is input to the excitation/demagnetization circuit C2 for preventing thread removal.

is now entered. Both excitation and demagnetization signal generation circuits 13 and 14 generate the signal S by the command of the control computer C.
+, St, and the control computer C controls the signal generation of the excitation/demagnetization signal generation circuit 13 based on the weft insertion control program, and also controls the signal generation of the excitation/demagnetization signal generation circuit 14 based on the thread removal prevention program. Control. The excitation/demagnetization generation signal generation circuits 13 and 14 include a generation timing adjuster 1.
3a.

14a is connected, so that the time width of the excitation/demagnetization signal output from the excitation/demagnetization signal generation circuit 13.14 can be adjusted.

In addition, the solenoid valves V2 to V5 are equipped with excitation/demagnetization circuits C for weft insertion.
1 and the excitation/demagnetization signal generation circuit 13 are connected to the excitation/demagnetization control of the electromagnetic valves V2 to V5, that is, the supply of air for weft insertion.

The weft insertion excitation/demagnetization circuit C1 is configured in parallel with an overexcitation circuit C1l and a holding circuit CI2.
consists of an overexcitation timing circuit 15 and a driver 16, and a holding circuit CI2 consists of a holding timing circuit 17 and a driver 18. The drive bars 16,18 are each connected to a voltage power supply terminal 24,26. The signal SI output from the excitation/demagnetization signal generation circuit 13 is transmitted to both timing circuits 15
．． 17, the overexcitation timing circuit 15 outputs an overexcitation timing signal S3 based on this input signal S1,
The hold timing circuit 17 outputs a hold timing signal S4 based on the input signal Ss.

The overexcitation timing signal S, enters the driver 16, and the overexcitation signal S of (timing, voltage)'' (tt, VH)
i is output from the driver 16. The hold timing signal S4 enters the driver 18, (timing, voltage) ”
” (tt, VL) hold signal S6 is the driver 1
Output from 8. Applied voltage signal S6.6 is both signal Ss
, Ss, and this applied voltage signal Ss1 is applied to the electromagnetic valve V1. A curve D1 in FIG. 2 is the injection pressure at the weft insertion main nozzle l due to the application of the applied voltage signals S, S, and the weft insertion of the weft yarn Y is performed by this injection pressure.

The excitation/demagnetization circuit C2 for preventing thread removal is configured in parallel with an overexcitation circuit Cz+ and a holding circuit Ctt.
! l consists of an overexcitation timing circuit 19 and a driver 20, and a holding circuit C12 consists of a holding timing circuit 21 and a driver 22. A timing regulator 23 is connected to the overexcitation timing circuit 19, and a power supply voltage regulator 25 is interposed between the driver 20 and the voltage power supply terminal 24.

Further, a power supply voltage regulator 27 is interposed between the driver 22 and the voltage power supply terminal 26.

A signal S2 is output from the excitation/demagnetization signal generation circuit 14 before and after the inserted weft yarn Y is cut by a cutter (not shown). The signal S2 output from the excitation/demagnetization signal generation circuit 14 enters both timing circuits 19 and 21, the overexcitation timing circuit 19 outputs an overexcitation timing signal S7 based on this input signal S2, and the hold timing circuit 2] Hold timing signal S based on input signal S2
Output ll.

The overexcitation timing signal S7 enters the driver 20, and the overexcitation signal S with (timing, voltage)=(ts, VH') is output from the driver 20.

The holding timing signal S8 enters the driver 22, and the holding signal S1° of (timing, voltage)=(t4.VL') is output from the driver 22. Applied voltage signal Ss, +o
is a composite signal of both signals Ss and Sho, and these applied voltage signals s e and to are applied to the electromagnetic valve V+. The curved line in FIG. 2 is the injection pressure at the weft insertion main nozzle 1 due to the application of the applied voltage signal S9.10, and this injection pressure prevents the weft Y from being pulled out.

Thread removal is prevented by injection pressure curve, machine rotation speed, thread type,
It is necessary to set it appropriately according to the yarn count and the air pressure in the pressure supply tank 7, and this setting is based on the voltage value V of the overexcitation signal S.
H', time width t8, and voltage value V of holding signal StO
This is done by changing L' and time width t4.

Voltage value v,'.

VL' can be adjusted by power supply voltage regulators 25 and 27, and time width t3 can be adjusted by timing regulator 23. The time width t4 is determined by the time width of the hold timing signal S8, and the time width of the hold timing signal S8 can be adjusted by the generation timing adjuster 14a. Through such adjustment, the applied voltage signal S11. The waveform shape of IO is set to an appropriate state, and the injection pressure curve D2 is set to a pressure value and time width suitable for preventing thread removal.

Applied voltage signal S1 in FIG. ,. is for thick yarn count, but in the case of standard yarn count, a lower voltage than curve D2 is appropriate as shown by curve D3 in Fig. 3, and therefore the voltage signal S++ is not excessive. Excitation section 811' receives applied voltage signal S9. IO overexcitation signal S.

, and the holding unit Sl+” is set lower than the holding signal SIO
is set lower than.

The curve D4 in FIG. 4 is an injection pressure curve for preventing thread removal in the case of weak thread, and the applied voltage signal SI2 consists only of the overexcitation portion.

For such thread removal, a single air supply system is used to properly set the prevention injection pressure and supply injection air for weft insertion, and two systems, the air supply system for weft insertion and the prevention air supply system, are used for thread removal. Compared to the conventional method, this method is advantageous in terms of simple structure and cost.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, the present invention can be applied to a multi-colored jet loom, and the present invention can be applied to multi-colored woven fabrics having the yarn counts and yarn types shown in FIGS. 2 to 4. In this case, the applied voltage curve Ss, +o+ S, s
The excitation/demagnetization control of the electromagnetic valve V1 may be performed by making +St□ correspond to each other.

Furthermore, as shown in FIG.
By applying 's, it is also possible to obtain an air supply curve for preventing thread removal, as shown by curve D5.

This is possible if the electromagnetic valve has good response, and in the case of the circuit configuration shown in Figure 1, the excitation/demagnetization circuit C!
The time width t of the output signal of the overexcitation circuit Ct+ may be made zero by adjusting the timing adjuster 23, or the voltage value v3'' may be made zero by adjusting the power supply voltage regulator 27. The excitation/demagnetization timing t
4 and the voltage value VL', it is possible to supply air to prevent thread removal in an optimal manner.

Furthermore, in the present invention, it is possible to omit the overexcitation circuit, or to close the air supply for preventing thread removal using only the holding voltage before the valve is completely opened after actuation of the electromagnetic valve.

[Effects of the Invention] As detailed above, the present invention controls the air supply for weft insertion and the air supply for preventing thread removal with a single electromagnetic valve, and also connects the excitation/demagnetization circuit for preventing thread removal in parallel. The over-excitation circuit and the holding circuit that make up the system incorporate a timing adjustment circuit and an applied voltage adjustment circuit, respectively, to form an air supply device that prevents thread removal, so thread removal can be prevented by excitation/demagnetization control of a single electromagnetic valve. In addition to being able to carry out both weft insertion and weft insertion, appropriate thread removal that matches the conditions such as thread type, thread count, machine rotation speed, etc. can be prevented with a preventive injection pressure, making it simple and easy to use. It has an excellent effect of being able to prevent thread removal with an advantageous configuration in terms of cost.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention, and FIG. 1 is a front view of the road body showing a weft insertion device and a thread removal prevention device, and FIG.
FIG. 5 is a graph showing an applied voltage curve and an injection pressure curve. Weft insertion main nozzle L, solenoid valve v1, weft insertion excitation/demagnetization circuit CI, thread removal prevention excitation/demagnetization circuit C2, overexcitation circuit C! 1. Holding circuit Czt, time width adjuster 14a and timing adjuster 23 as a timing adjustment circuit, power supply voltage regulator 25.27° as an applied voltage adjustment circuit Patent applicant: Toyoda Automatic Loom Works, Ltd.
Person Patent attorney Hironobu Onda (and 1 other person) Applied voltage Funeral figure injection pressure b “Applied voltage Machine table rotation angle Injection pressure Machine table rotation angle b・ Funeral figure machine table mouth rotation angle

Claims (1)

[Claims] 1. In a jet loom in which a solenoid valve for air supply control is interposed between a main nozzle for weft insertion and an air supply tank, the solenoid valve is excited and demagnetized to supply air for weft insertion to the main nozzle for weft insertion. It has a weft insertion excitation/demagnetization circuit, and a thread dropout prevention excitation/demagnetization circuit for excitation/demagnetization of the electromagnetic valve to supply thread dropout prevention air to the weft insertion main nozzle. An air supply device for a jet loom, which is incorporated into a circuit and has a timing adjustment circuit and an applied voltage adjustment circuit connected to a holding circuit that supplies voltage necessary for operating the electromagnetic valve.