JPH10299643A - Water injecting pump for loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent variations in the pressure of injecting water to make the shape of the injecting water and to prevent fluff of a warp from generating by injecting water by employing a coil spring having nonlinear characteristics that a spring constant is changed according to the amount of contraction of the spring. SOLUTION: When a cam follower passes a cam top and moves to a bottom cam surface by the rotation of the cam, a connecting lever is released from a cam and a contracted coil spring 24a having nonlinear characteristics presses a plunger 20 to rapidly discharge water in a cylinder room 18a, closing a suction valve 41 and opening a discharge valve 42, supplying injecting water into a weft inserting nozzle. The coil spring 24a has nonlinear characteristics that a spring constant is changed according to the amount of contraction of the spring and that a natural frequency, which is a function of a spring constant, is also changed in response to the amount of contraction of the spring and the natural frequency of the coil spring 24a is changed instantly when the plunger 20 is slid. Therefore, the coil spring 24a does not resonate with variations in the pressure of injecting water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device for supplying jet water to a weft insertion nozzle of a water jet loom.

[0002]

2. Description of the Related Art In a conventional pump device for supplying water to a weft insertion nozzle of a water jet loom, a plunger is displaced against a resilient force of a spring in a pump body by a cam or the like rotating synchronously with a main shaft of the loom. In addition, the suction operation is performed, and the spring is stored in accordance with the suction operation. At the time of pump discharge, the stored spring is released at a predetermined timing, and the plunger performs the discharge operation, and the injection water is discharged. Is supplied to the weft insertion nozzle.

[0003] However, in such a conventional water jet loom pump device, a large pulsation occurs in the pressure of the jet water as the speed of the loom increases, so that a plurality of bumps are generated in the shape of the jet water. As a result, the following problems occurred.

[0004] A plurality of subsequent bumps collide with the bump at the tip, which is slowed down by air resistance while flying through the warp shedding, and coalesce to form a bump with a large tip. For this reason, the flying speed decreases due to the increase in air resistance, and the weft insertion performance deteriorates, and the enlarged hump at the tip contacts the warp and scratches it, causing fluffing and poor opening due to it, In addition to causing mistakes, warp is formed on the woven fabric and the quality is reduced.

FIG. 8 (a) is a view showing the shape of the tip of jet water immediately after jetting from a weft insertion nozzle during operation at a loom rotation speed of 1000 rpm using a conventional pump device. When the loom was operated at a rotational speed of 800 rpm, there were only bumps at the tip, but since the rotational speed was increased to 1000 rpm, four bumps due to pressure pulsation were observed. (B)
It is the figure which observed the state in which the tip of the bump decreased in speed due to air resistance during the flight of the warp shedding from the state of the jet water immediately after the ejection of FIG.
(C) is a diagram in which a state where the tip of the jet water has become the shape of FIG. The diameter of the bump at the tip is almost twice as large as immediately after the injection.

Therefore, in the invention of Japanese Utility Model Publication No. Hei 7-26381, in the above-mentioned pump device, in order to suppress the pulsation of the injection water, a vibration damping member is provided between the spring end and the action part with which the spring end abuts. It is proposed to intervene.
At the end of the discharge operation of the plunger, the lever that engages the plunger violently collides with the stroke adjuster with the force of the spring and is instantaneously stopped. At this time, the spring receives a strong impact. In this invention, the vibration of the spring caused by the impact is reduced by interposing a vibration damping member between the end of the spring and the working part with which the end of the spring abuts. Thus, the pulsation of the jet water is suppressed.

[0007]

However, in the case of the pump device of the present invention, the damping member does not act during the discharging operation of the plunger, and the damping member operates when the discharging operation of the plunger is completed. Therefore, during the discharge operation of the plunger, the damping member has almost no effect of damping the vibration of the spring, and the provision of the damping member sufficiently prevents pulsation in the pressure of the jet water. I couldn't do that.

The present invention suppresses the pressure pulsation of the injection water of the pump device, which has become intense with the increase in the speed of the loom, makes the injection water shape good, and prevents the generation of warp fluff due to the injection water. The aim is to improve the operation rate of the loom and to produce high-quality woven fabric.

[0009]

For this reason, the present applicant has repeatedly conducted research and experiments and found that the cause of the pulsation of the injection water pressure of the pump device, which became intense with the increase in speed of the loom, was the resonance of the spring. We have found that it is based on the phenomenon as follows. To increase the speed of the loom, it is necessary to increase the pressure of the injection water. However, if the pressure of the injection water is increased, the injection water becomes more turbulent due to complicated pipes and discharge valves. Fluctuations become more severe. When the spring resonates with the pressure fluctuation of the injection water, the spring vibrates very vigorously as compared with the resonance at the time of the low-speed operation of the loom. Generates a large pressure pulsation. Research and experiments for suppressing the resonance phenomenon of the spring are accumulated, and the spring of the pump device is a non-linear characteristic coil spring whose spring constant changes with the change in the amount of deflection of the spring, and is configured to be used for the pump device. .

As the non-linear coil spring, any one of unequal-pitch coil spring, conical coil spring, continuous coil spring, barrel coil spring and taper coil spring is used. Here, the tapered coil spring means a spring having a non-uniform wire diameter and a tapered shape.

[0011]

In the above arrangement, during the discharge operation of the plunger, the spring constant of the non-linear characteristic coil spring changes constantly. As a result, the natural frequency, which is a function of the spring constant, constantly changes.Therefore, it is instantaneous that the ratio of the frequency of the injection water pressure fluctuation applied to the non-linear characteristic coil spring to the natural frequency of the non-linear characteristic coil spring becomes an integral multiple. Nor.

Therefore, the non-linear characteristic coil spring resonates with the pressure fluctuation of the jet water and does not vibrate greatly. Therefore, the pulsation of the jet water pressure does not occur due to the resonance of the spring. No bumps were observed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a pump device according to the present invention.
An unequal pitch coil spring 24a is used as the non-linear characteristic coil spring 24, and FIG. 2 is a schematic view of the entire weft insertion device.

The pump device 1 draws in water from a constant water level tank (not shown), discharges the water, and supplies the jet water W to a weft insertion nozzle 12 through a water guide pipe 14.
Jets the weft 10 together with the jet water W.

The pump device 1 is provided with a cylindrical cylinder portion 18 which is screwed to the housing 16 and has a cylinder chamber 18.
A slidable plunger 20 that fits inside a is provided. Further, a plunger 20 is provided outside the cylinder portion 18.
A spring receiver 22 is provided which slides integrally with the spring receiver 22.

A spring case 27 is screwed into the housing 16, the amount of screwing is adjusted so as to obtain the optimum injection water pressure according to the operating conditions of the loom, and the spring case 27 is fixed with a lock nut 28.

Spring receiver 22 and spring case 2
7, an unequal pitch coil spring 24a is elastically interposed therebetween.
One end of a is in contact with the flange 22a of the spring receiver 22, and the other end is in contact with the flange 27a of the spring case 27.

The base end of the plunger 20 is connected to a connecting lever 32 via a ball joint 31 and a connecting member 30. The connecting lever 32 is provided integrally with a connecting lever 36 and swings about a swing center shaft 34. Move.

A cam follower 38 is rotatably attached to the distal end of the connecting lever 36 and abuts on a cam 40. The cam 40 rotates in the direction of the arrow in synchronization with a loom main shaft (not shown).

A stroke adjusting bolt 39 is provided at a position corresponding to one end of the connecting lever 32, and restricts the movement of the connecting lever 32 to restrict the stroke of the plunger 20.

As the cam 40 rotates, the cam follower 38
Is pressed by the spiral cam surface 40a, the pump device 1 performs a water absorbing operation.

The spiral cam surface 4 is provided via a cam follower 38.
0a, the connecting lever 36 and the connecting lever 32 rotate clockwise. When the connecting lever 32 pulls the plunger 20 to the left in the drawing, the suction valve 41 opens, the discharge valve 42 closes, and water from a constant water tank (not shown) is sucked into the cylinder chamber 18a via the water suction pipe 13. You. At the same time, the unequal-pitch coil spring 24a is compressed and charged by the movement of the flange 22a of the spring receiver 22 which is engaged with and integrated with the plunger 20.

Next, with the rotation of the cam 40, the cam follower 38 passes through the cam top 40c and the bottom cam surface 40b
Then, the pump device 1 performs a discharging operation.

The connection lever 36 and the connection lever 32 are released from the restraint by the cam 40, and the stored unequal-pitch coil springs 24a are connected to the collar portions 22a of the spring receiver 22.
Through the plunger 20 to the right of the drawing,
The water in the cylinder chamber 18a is rapidly discharged, and the suction valve 41
Is closed and the discharge valve 42 is opened to supply the jet water W to the weft insertion nozzle 12.

In this case, the weft insertion nozzle 12
The pipe line to the valve is bent, and the pipe diameter changes greatly.
2, the flow of the jet water becomes a strong turbulent flow. Therefore, the injection water pressure fluctuates as a superposition of a sine wave and some harmonics. Fluctuations in the injection water pressure are transmitted via the plunger 20 to the unequal pitch coil springs 24.
a acts repeatedly as a load vibration.

When the ratio between the natural frequency of the unequal pitch coil spring 24a and the frequency of the jet water pressure fluctuation becomes an integral multiple, the unequal pitch coil spring 24a causes the fluctuation of the jet water pressure and the resonance phenomenon. Waking up and vibrating very violently, so that the pressure of the jet water fluctuates further and pulsates greatly

However, the unequal-pitch coil spring 24a has a non-linear characteristic in which the spring constant changes depending on the amount of deflection of the spring, and the natural frequency which is a function of the spring constant also changes depending on the amount of deflection. Since the natural frequency of the unequal-pitch coil spring 24a changes instantaneously and instantaneously with the sliding of the plunger 20, the unequal-pitch coil spring 24a does not cause the fluctuation of the jet pressure and the resonance phenomenon.

Therefore, abnormal vibrations due to the resonance phenomenon of the unequal pitch coil spring 24a are added to the fluctuation of the injection water pressure, and the pressure of the injection water fluctuates more sharply, so that a large pulsation does not occur in the pressure of the injection water. .

Therefore, a plurality of bumps due to the pressure pulsation are not observed in the tip shape of the jet water, and the weaving property and the quality of the woven fabric are not impaired by the plurality of bumps.

FIGS. 4, 5, and 6 show pressure waveforms of the jet water measured at the tip of the weft insertion nozzle 12. FIG.

FIG. 5 is a pressure waveform when the loom rotates at 800 rpm using a conventional pump device. A, B, C,
Small pressure pulsations due to the resonance phenomenon of the coil spring are observed at four points D.

FIG. 6 is a pressure waveform when the loom rotates at 1000 rpm using a conventional pump device. A, B,
Large pressure pulsations due to the resonance phenomenon of the coil spring are observed at four points C and D.

FIG. 4 is a pressure waveform during operation of the loom at a rotation speed of 1000 rpm using the pump device of the present invention. An unequal pitch coil spring is used as a coil spring having a non-linear characteristic. Although small pressure pulsations are observed at three points A, B, and C, the pressure pulsation is much smaller than that of the conventional pump device shown in FIG.

[0035]

According to the present invention, in the pump device, the pressure pulsation of the jet water, which is increased by increasing the rotation speed of the loom, can be extremely reduced by the present invention. Therefore, the occurrence of a plurality of bumps in the tip shape of the jet water has been eliminated, so that the generation of fluff due to the jet water can be prevented, and the accident that the spring is broken due to abnormal vibration due to the resonance phenomenon in a short time has disappeared. As a result, it is possible to increase the rotation speed of the loom and increase the productivity while maintaining the loom operation rate and the fabric quality. If the rotation speed of the loom is not increased, the present invention almost eliminates the resonance phenomenon of the spring, and further improves the shape of the jet water, so that the operating rate of the loom and the quality of the woven fabric can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump device according to the present invention.

FIG. 2 is an overall schematic diagram.

FIG. 3 is a non-linear characteristic coil spring used in the pump device of the present invention.

FIG. 4 is a pressure waveform of injection water using the pump device of the present invention.

FIG. 5 is a pressure waveform of injection water using a conventional pump device.

FIG. 6 is a pressure waveform of injection water using a conventional pump device.

FIG. 7 is a conventional pump device.

FIG. 8 is a view showing the shape of the tip of jet water in a conventional pump device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump apparatus 10 Weft 12 Weft insertion nozzle 18 Cylinder part 20 Plunger 22 Spring receiver 24 Non-linear characteristic coil spring 24a Unequal pitch coil spring 124 Coil spring (linear characteristic) 27 Spring case 32, 36 Connection lever 38 Cam follower 40 Cam 40a spiral shape Cam surface 40b Bottom cam surface 40c Cam top

Claims (2)

[Claims] In the water suction operation of the plunger, the spring is charged by displacing the plunger against the elastic force of the spring, and the water is discharged from the plunger by the stored spring. A pump device for a water injection loom, wherein the spring is a non-linear coil spring whose spring constant changes according to the amount of deflection. 2. The spring according to claim 1, wherein the non-linear characteristic coil spring is any one of a non-uniform pitch coil spring, a conical coil spring, a continuous coil spring, a barrel coil spring, and a tapered coil spring. Pump device for water injection loom.