JP3783933B2 - Water jet device in water jet loom - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water injection device in a water jet loom that pumps water to a weft insertion nozzle by a weft insertion pump to inject water from the weft insertion nozzle, and wefts are inserted by the water injection action of the weft insertion nozzle. is there.
[0002]
[Prior art]
FIG. 16 shows a water injection device in a conventional water jet loom, and FIG. 17 shows an internal structure of a weft insertion pump 11 constituting the conventional water injection device. A water storage chamber forming cylinder 13 is accommodated and fixed in a cylindrical pump housing 12 of the weft insertion pump 11, and a plunger 14 is slidably accommodated in the cylinder of the water storage chamber forming cylinder 13. A spring seat 15 is attached to the plunger 14, and a spring cap 16 is screwed onto the inner peripheral surface of the cylindrical pump housing 12. The spring cap 16 is fixed to the pump housing 12 by tightening a lock nut 17. A coil spring 18 is interposed between the seat portion 151 of the spring seat 15 and the seat portion 161 of the spring cap 16.
[0003]
A suction port 121 and a discharge port 122 are formed in the pump housing 12, and a water storage chamber 123 is formed between the suction port 121 and the discharge port 122. Check valves 19 and 20 are interposed between the water storage chamber 123 and the suction port 121 and between the water storage chamber 123 and the discharge port 122. As shown in FIG. 16, the suction pipe 24 connected to the suction port 121 communicates with the float box 25, and the discharge pipe 26 connected to the discharge port 122 is connected to the weft insertion nozzle 27.
[0004]
The plunger 14 is connected to the cam lever 22 via the joint 21. The cam lever 22 can contact and separate from the cam 23 via the cam follower 221. The cam lever 22 is reciprocally oscillated by the cooperation of the cam spring 18 and the coil spring 18 that rotate in the direction of arrow Z in FIG. 16 at a constant angular velocity in synchronization with the rotation of the loom. The plunger 14 and the spring seat 15 reciprocate integrally as the cam lever 22 reciprocates. In FIG. 16, when the cam lever 22 rotates left about the support shaft 222 by the rotational force of the cam 23, the plunger 14 and the spring seat 15 move forward against the spring force of the coil spring 18 (from the right side in FIG. 17). Move to the left). The forward movement of the spring seat 15 compresses the coil spring 18, and the forward movement of the plunger 14 sucks a certain amount of water into the water storage chamber 123 from the float box 25 through the suction pipe 24. While the check valve 19 is opened and absorbed in the water storage chamber 123, the check valve 20 is closed, and water in the discharge pipe 26 does not flow back to the water storage chamber 123 side.
[0005]
When the cam follower 221 exceeds the maximum diameter position Ma of the cam surface 231 of the cam 23, the cam follower 221 is separated from the cam surface 231 of the cam 23, and the plunger 14 receiving the restoring force of the coil spring 18 pressurizes the water in the water storage chamber 123. . When the water in the water storage chamber 123 is pressurized, the check valve 19 is closed and the check valve 20 is opened, so that the pressurized water in the water storage chamber 123 passes through the discharge pipe 26 and the weft insertion nozzle 27. To be pumped. The water pumped to the weft insertion nozzle 27 is ejected from the weft insertion nozzle 27 and the weft Y is inserted into the warp opening. The cam follower 221 away from the cam surface 231 of the cam 23 comes into contact with the cam surface 231 or a separately provided stopper 28 for limiting the amount of injected water, and one cycle of water injection is completed.
[0006]
The stopper 28 includes a female screw body 281 that is fixedly disposed, a male screw body 282 that is screwed to the female screw body 281, and a lock nut 283 that is screwed to the male screw body 282. The male screw body 282 is fixed to the female screw body 281 by tightening the lock nut 283. By changing the screwing position of the male screw body 282 with respect to the female screw body 281, the final end position of the cam lever 22 in the backward movement direction is changed.
[0007]
A curve K in the graph of FIG. 18 shows the relationship between the loom rotation angle and the cam lift amount (that is, the displacement amount of the cam follower 221 in the radial direction from the minimum diameter position of the cam surface 231 of the cam 23). The loom rotation angles θ1 to θ2 are water suction strokes in which the cam lift amount increases at substantially the same speed, and the loom rotation angles θ3 to θ4 are water injection strokes in which the cam lift amount decreases rapidly from the maximum value.
[0008]
[Problems to be solved by the invention]
The weft insertion pump 11 obtains a driving force from the loom driving motor via the cam 23 and the cam lever 22. Therefore, when the injection timing of the weft insertion nozzle is to be changed according to the change of the cloth type, the attachment of the cam 23 to the support shaft 232 of the cam 23 is adjusted, the cam 23 is replaced, or the stopper 28 is changed. It is necessary to change the screwing position of the lock nut 283 with respect to the female screw body 281 in FIG. The necessity of such work hinders automation of the water jet loom.
[0009]
An object of this invention is to provide the water injection apparatus suitable for automation of a water jet loom.
[0010]
[Means for Solving the Problems]
Therefore, the present invention The piston in the cylinder is urged in the direction of top dead center by spring means. In a water jet device in a water jet loom that pumps water from a weft insertion nozzle by pumping water to a weft insertion nozzle by a weft insertion pump, and wefts are inserted by the water injection action of the weft insertion nozzle, High pressure water that only overcomes the load by which the spring means urges the piston in the direction of top dead center and moves the piston in the direction of bottom dead center to the cylinder. A water supply source that can be supplied, a first water supply state switching means that can switch between a state in which high-pressure water can be supplied from the water supply source to the weft insertion pump and a state in which supply of the high pressure water is impossible, and A second water supply state switching means for switching between a state in which water can be supplied to the inlet nozzle and a state in which water cannot be supplied; and a state where water can be supplied and a state where water cannot be supplied; And a third water supply state switching means for blocking water supply to the weft insertion nozzle when supplying high-pressure water to the pouring pump. The drive source was made independent of the loom drive source.
[0011]
When the first water supply state switching means can be supplied and the third water supply state switching means cannot be supplied, the high pressure water of the water supply source Is Spring means in weft insertion pump Loads that urge the piston toward top dead center Overcoming While moving the piston toward the bottom dead center Supplied to the weft insertion pump. When the first water supply state switching means cannot be supplied and the second and third water supply state switching means can be supplied, the water in the weft insertion pump Is Biasing force of spring means in weft insertion pump Movement toward the top dead center To the weft insertion nozzle. The water supply switching state of the second water supply state switching means is switched independently from the loom drive source. Such switching independent of the loom drive source facilitates changing the timing of water supply from the weft insertion pump to the weft insertion nozzle, that is, the water injection timing.
[0012]
According to a second aspect of the present invention, in the first aspect of the present invention, the water injection device is provided that includes a switching control unit that electrically controls a water supply switching state of the second water supply state switching unit.
[0013]
The water supply switching state of the second water supply state switching means is electrically switched by the switching control means. Such electrical switching control facilitates changing the timing of water supply from the weft insertion pump to the weft insertion nozzle, that is, the water injection timing.
[0014]
According to a third aspect of the present invention, in any one of the first and second aspects, the drive source of the first water supply state switching means is independent from the loom drive source, and the water supply of the first water supply state switch means The switching state is electrically controlled by the switching control means.
[0015]
The water supply switching state of the first water supply state switching means is electrically switched by the switching control means. Such electrical switching control facilitates changing the timing of water supply from the water supply source to the weft insertion pump.
[0016]
According to a fourth aspect of the present invention, in any one of the first to third aspects, the spring means includes a pressure chamber that houses a compressible gaseous fluid, and the pressure of the fluid in the pressure chamber is controlled. The fluid spring means is a spring force.
[0017]
According to a fifth aspect of the present invention, in the fourth aspect, the fluid spring means is an air spring means in which the air pressure is a spring force.
In the fourth and fifth aspects, since the surging vibration is small in the fluid spring means in which the pressure of the compressible fluid is a spring force, the fluctuation (pressure pulsation) of the water injection pressure due to the surging vibration is small. Therefore, the state in which the weft insertion of the weft is disturbed by the surging vibration is improved. Moreover, since there is no conventional coil spring, the rising speed of the water injection pressure can be increased.
[0018]
According to a sixth aspect of the present invention, in any one of the fourth and fifth aspects, the spring force adjusting means for adjusting the fluid spring force in the fluid spring means, and the spring force adjusting state in the spring force adjusting means in an electric state. The water injection apparatus provided with the injection pressure control means to control automatically was comprised.
[0019]
The spring force adjustment state in the spring force adjustment means is electrically controlled by the injection pressure control means. Such control of the electric spring force adjustment state makes it easy to change the water injection pressure in the weft insertion nozzle.
[0020]
According to a seventh aspect of the present invention, in the sixth aspect, a fluid supply source for supplying a high-pressure fluid to the pressure chamber of the fluid spring means, and a pressure adjustment for adjusting the pressure of the fluid supplied to the fluid spring means The spring force adjusting means is provided, and the pressure adjustment state in the pressure adjusting means is electrically controlled by the injection pressure control means.
[0021]
The pressure adjustment state in the pressure adjustment means is electrically controlled by the injection pressure control means. Such control of the electrical pressure adjustment state facilitates the change of the water injection pressure in the weft insertion nozzle.
[0023]
Contract Claim 8 In the invention of claim 4, claims 4 to 7 The fluid spring means comprising: a fluid cylinder; a piston accommodated in the fluid cylinder; and the pressure chamber defined in the fluid cylinder by the piston. The movement from the top dead center position to the bottom dead center position is caused by feeding high-pressure water to the weft insertion pump, and the bottom dead center position of the piston for supplying water from the weft insertion pump to the weft insertion nozzle The movement from the top dead center position to the top dead center position is caused by the pressure of the fluid in the pressure chamber.
[0024]
When the first water supply state switching means can be supplied and the third water supply state switching means cannot be supplied, the high pressure water of the water supply source overcomes the pressure in the pressure chamber and causes the piston to die. Move from the point position to the bottom dead center position. Thereby, water is supplied to the weft insertion pump. When the first water supply state switching means cannot be supplied and the second and third water supply state switching means can be supplied, the piston is dead from the bottom dead center position side by the pressure in the pressure chamber. Move to the point position side. Thereby, the water in the weft insertion pump is supplied to the weft insertion nozzle.
[0025]
Claim 9 In the invention of claim 8 The water injection device provided with the position control means which can change the bottom dead center position of the said piston was comprised.
The injection pressure at the start of water injection can be changed by changing the bottom dead center position of the piston.
[0026]
Claim 1 0 In the invention of claim 8 or 9 In the above, the holding means that can be switched between a state where the piston can be held at the bottom dead center position and a state where the piston cannot be held is the second water supply state switching means. The holding control means for electrically switching the holding means is the switching control means.
[0027]
When the holding means is in a holdable state and the piston is held at the bottom dead center position, water supply from the weft insertion pump to the weft insertion nozzle is blocked. When the piston is at the bottom dead center position and the third water supply state switching means can be supplied, if the holding means is switched from the holdable state to the non-holdable state, the piston is moved from the bottom dead center position. Start moving toward top dead center position.
[0028]
Claim 1 1 In the present invention, claims 1 to 1 are provided. 0 In any one of the above, the water jet loom uses a plurality of water injection devices to weft a plurality of wefts, and the first water supply state switching means in the plurality of water injection devices is a single first. Shared by the water supply state switching means.
[0029]
Sharing the first water supply state switching means is advantageous for making the weft insertion device compact in multi-color weft insertion.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0031]
As shown in FIG. 1A, a support cylinder 31 is erected on the flow path block 30, and an air cylinder 32 as a fluid cylinder is coaxially fixed and supported on the support cylinder 31. . A water cylinder 33 is accommodated in the support cylinder 31. The water cylinder 33 is fixed on the flow path block 30. An end wall plate 34 is fitted in the upper portion of the air cylinder 32. A plunger 35 is slidably fitted into the water cylinder 33. The upper end portion of the plunger 35 penetrates the end wall plate 34 so as to be slidable. A piston 37 is slidably accommodated in the air cylinder 32. The piston 37 is fixed to the plunger 35, and the piston 37 and the plunger 35 can move integrally in the axial direction of the cylinders 32 and 33.
[0032]
A seal ring 36 is slidably attached to the plunger 35 in a through hole of the end wall plate 34 that penetrates the upper end portion of the plunger 35. A seal ring 38 is attached to the peripheral surface of the piston 37 so as to be in sliding contact with the inner peripheral surface of the air cylinder 32. The piston 37 defines a pressure chamber 321 in the air cylinder 32.
[0033]
A position restricting portion 371 is integrally formed on the lower surface of the piston 37. The position restricting portion 371 is in contact with the upper end of the water cylinder 33 and defines the lowest movement position of the piston 37, that is, the top dead center position of the piston 37.
[0034]
A support cylinder 59 is erected on the upper end of the air cylinder 32, and a support plate 60 is fastened and fixed to the upper end of the support cylinder 59 by screws 61. Bolts 62 are screwed to the support plate 60. The bolt 62 is fixed to the support plate 60 by tightening the lock nut 63. The head 621 of the bolt 62 is on the axis of the plunger 35, and the upper end of the plunger 35 can contact the head 621 of the bolt 62. The bolt 62 defines the most moved position of the plunger 35, that is, the bottom dead center position of the piston 37.
[0035]
The flow path block 30, the support cylinders 31 and 59, the support plate 60, the bolt 62, the lock nut 63, the air cylinder 32, the water cylinder 33, the plunger 35, the piston 37, and the end wall plate 34 constitute a weft insertion pump 64. The air cylinder 32, the pressure chamber 321, the piston 37, and the seal rings 36 and 38 constitute an air spring means.
[0036]
An air pressure source 39 as a fluid supply source is connected to the pressure chamber 321 through an air pipe 40. An electric pressure regulating valve 41 and a check valve 42 having a relief function are interposed on the air conduit 40. A throttle passage 43 is provided in parallel with the check valve 42 between the pressure regulating valve 41 and the pressure chamber 321. A pressure gauge 44 is connected to the air conduit 40 between the pressure regulating valve 41 and the check valve 42. The pressure gauge 44 is for confirming the air pressure between the pressure regulating valve 41 and the check valve 42. The pressure adjustment valve 41 always maintains the pressure in the air conduit 40 between the pressure adjustment valve 41 and the check valve 42 at the pressure set by the pressure adjustment valve 41. The pressure Pi (quasi-initial pressure) in the pressure chamber 321 set by the pressure adjustment valve 41 is a pressure when the piston 37 in the pressure chamber 321 is at the top dead center position.
[0037]
When the piston 37 moves from the top dead center position toward the bottom dead center position, the air in the pressure chamber 321 of the air cylinder 32 is compressed by the presence of the check valve 42. Since the passage cross-sectional area in the throttle passage 43 is small, air leakage from the throttle passage 43 in a short time does not substantially occur. Therefore, the pressure in the pressure chamber 321 increases as the piston 37 moves from the top dead center position toward the bottom dead center position. When the piston 37 reaches the bottom dead center position, that is, when the plunger 35 contacts the bolt 62, the pressure in the pressure chamber 321 becomes the maximum pressure Pm (> Pi).
[0038]
A normally-closed electromagnetic on-off valve 45 is mounted on the flow path block 30. Channels 301 and 302 are formed in the channel block 30. An in-cylinder 331 of the water cylinder 33 communicates with the flow path 301. An inlet 451 of the electromagnetic opening / closing valve 45 communicates with the flow path 301, and an outlet 452 of the electromagnetic opening / closing valve 45 communicates with the flow path 302. The flow path 302 communicates with the weft insertion nozzle 47 via the pipe line 46.
[0039]
A normally closed electromagnetic on-off valve 49 is attached to a flow path block 48 different from the flow path block 30. Channels 481 and 482 are formed in the channel block 48. An inlet 491 of the electromagnetic on-off valve 49 communicates with the flow path 481, and an outlet 492 of the electromagnetic on-off valve 49 communicates with the flow path 482. The flow paths 482 and 301 are connected by a pipe line 50. A part of the flow path 482, 301, the pipe 50 and the cylinder 331 of the water cylinder 33 serves as a water storage chamber 641.
[0040]
The flow path 481 communicates with the float box 51 via a pipe line 53, and a plunger pump 52 is interposed on the pipe line 53. The water in the float box 51 is pumped toward the flow path 481 in the flow path block 48 by the plunger pump 52. A reflux line 54 is connected to the line 53 so as to be in parallel with the plunger pump 52. A pressure regulating valve 55 is interposed on the reflux line 54. A pulsation absorbing device 56 is attached to the pipe line 53 between the plunger pump 52 and the electromagnetic on-off valve 49. The plunger pump 52 is continuously operated, and water in the float box 51 is continuously pumped toward the flow path 481 of the flow path block 48. When the electromagnetic on-off valve 49 is in the closed state, the water pumped from the plunger pump 52 returns to the float box 51 via the return conduit 54.
[0041]
The float box 51, the plunger pump 52, the pulsation absorbing device 56, the reflux conduit 54, and the pressure adjustment valve 55 constitute a water supply source 29 that can supply high-pressure water to the weft insertion pump 64.
[0042]
The pressure adjustment valve 55 is adjusted to provide a pressure Po that is considerably higher than the maximum pressure Pm in the pressure chamber 321 of the air cylinder 32. The pressure receiving area of the plunger 35 with respect to the water pressure of the water storage chamber 641 (that is, the end area of the lower end of the plunger 35) is S1. The pressure receiving area of the piston 37 with respect to the air pressure in the pressure chamber 321 (that is, the area of the upper surface of the piston 37) is S2 (> S1). The pressure Po is higher than the pressure represented by Pm · S2 / S1. Therefore, the pressure in the pipe line 53 between the plunger pump 52 and the electromagnetic on-off valve 49 is a pressure Po higher than the pressure represented by Pm · S2 / S1. If the electromagnetic on-off valve 49 is in the open state and the electromagnetic on-off valve 45 is in the closed state, the pressure in the water storage chamber 641 also becomes the pressure Po. When the pressure in the water storage chamber 641 is the pressure Po, the total load due to the pressure of the high-pressure water applied to the plunger 35 exceeds the total load due to the air pressure applied to the piston 37. Accordingly, the piston 37 moves from the top dead center position side to the bottom dead center position side.
[0043]
As shown in FIG. 1A, the electromagnetic on-off valves 49 and 45 and the pressure regulating valve 41 are subjected to electrical command control of a control device 57 incorporating a computer. A control data input device 58 is signal-connected to the control device 57. The control data input device 58 inputs and stores the desired water injection timing in the weft insertion nozzle 47, that is, the excitation / demagnetization timing of the electromagnetic on-off valve 45, into the control device 57. The control data input device 58 inputs and stores the excitation / demagnetization timing of the electromagnetic on-off valve 49 to the control device 57. The control data input device 58 is for inputting a desired quasi-initial pressure Pi in the pressure chamber 321 of the air cylinder 32 to the control device 57 for storage. A rotary encoder 65 for detecting the loom rotation angle is connected to the control device 57 as a signal. M shown in FIG. 1A is a loom drive motor serving as a loom drive source.
[0044]
The control device 57 controls the excitation / demagnetization of the electromagnetic on-off valves 49 and 45 based on the loom rotation angle detection information obtained from the rotary encoder 65 and preset excitation / demagnetization timing. The control device 57 controls the pressure adjustment state of the pressure adjustment valve 41 so that the quasi-initial pressure Pi is set in advance. The electromagnetic on-off valve 49 is a first water supply state switching means that is switched between a state in which high-pressure water can be supplied from the water supply source 29 to the wetting pump 64 and a state in which high-pressure water cannot be supplied. The electromagnetic on-off valve 45 is a second water supply state switching means that switches between a state in which water can be supplied from the weft insertion pump 64 to the weft insertion nozzle 47 and a state in which water cannot be supplied. The electromagnetic on-off valve 45 is a third water supply state switching means for preventing water supply to the weft insertion nozzle 47 when high pressure water is supplied from the water supply source 29 to the weft insertion pump 64 to the weft insertion nozzle 47. It is. The pressure adjustment valve 41 and the air pressure source 39 constitute spring force adjusting means for adjusting the fluid spring force in the fluid spring means. The control device 57 and the control data input device 58 are electrically connected to the switching control means for electrically controlling the water supply switching state of the second water supply state switching means (the electromagnetic on-off valve 45) and the spring force adjustment state in the spring force adjustment means. The injection pressure control means for controlling the system is configured.
[0045]
A curve D in the graph of FIG. 4 represents a preset excitation / demagnetization timing of the electromagnetic switching valve 45, and a curve E represents a preset excitation / demagnetization timing of the electromagnetic switching valve 49. A curve F represents a change in injection pressure in the weft insertion nozzle 47, and a curve G represents a pressure change in the pressure chamber 321.
[0046]
When the excitation of the electromagnetic on-off valve 45 is switched to demagnetization (when the loom rotation angle θ is θ2 in FIG. 4), the piston 37 is at the top dead center position, and the electromagnetic on-off valve 49 is in a demagnetized state. Water injection at the weft insertion nozzle 47 is stopped. 1A and 1B show the demagnetization state of the electromagnetic on-off valves 49 and 45. FIG. When the loom rotation angle θ becomes θ3, the control device 57 commands excitation of the electromagnetic on-off valve 49. The electromagnetic on-off valve 49 is switched from the closed state to the open state based on the excitation command from the control device 57. As shown in FIG. 2B, when the electromagnetic on-off valve 49 is opened, high-pressure water pumped from the plunger pump 52 is sent to the water storage chamber 641 via the electromagnetic on-off valve 49. The pumping of the high-pressure water to the water storage chamber 641 moves the piston 37 at the top dead center position shown in FIG. 1A to the bottom dead center position shown in FIG. When the loom rotation angle θ becomes θ4, the control device 57 commands demagnetization of the electromagnetic on-off valve 49. The electromagnetic on-off valve 49 is switched from the open state to the closed state based on a demagnetization command from the control device 57. When the loom rotation angle θ becomes θ1, the control device 57 commands excitation of the electromagnetic on-off valve 45. The electromagnetic on-off valve 45 is switched from the closed state to the open state based on the excitation command from the control device 57. As shown in FIGS. 3A and 3B, when the electromagnetic on-off valve 45 is opened, the piston 37 at the bottom dead center position moves toward the top dead center position by the air pressure in the pressure chamber 321. . The movement of the piston 37 from the bottom dead center position to the top dead center position, that is, the movement of the plunger 35 pumps the water in the water storage chamber 641 to the weft insertion nozzle 47, and the water is jetted from the weft insertion nozzle 47 so that the weft Y Is inserted.
[0047]
When the piston 37 moves from the top dead center position toward the bottom dead center position, the volume of the pressure chamber 321 decreases, and the pressure in the pressure chamber 321 starts to rise from the quasi-initial pressure Pi. When the pressure in the pressure chamber 321 starts to rise, the check valve 42 is closed. Thereafter, the pressure in the pressure chamber 321 increases as the piston 37 moves toward the bottom dead center position, and when the piston 37 reaches the bottom dead center position, the pressure in the pressure chamber 321 reaches the maximum pressure Pm. . The pressure at the start of air compression in the pressure chamber 321 is defined as the quasi-initial pressure Pi set by the pressure adjustment valve 41 due to the presence of the check valve 42. That is, the pressure in the pressure chamber 321 is maintained at a level equal to or higher than the quasi-initial pressure Pi provided by the pressure adjustment valve 41. A curve Pb in the graph of FIG. 5 shows the relationship between the volume of the pressure chamber 321 and the pressure in the pressure chamber 321.
[0048]
The pressure change indicated by the curve Pb in FIG. 5 is expressed as follows. Generally, the actual change in pressure P when air is compressed and expanded in the air compressor is expressed by the following equation (1) as a polytropic change.
[0049]
P · Vn = constant (1)
N in the formula (1) is a polytropic index, and usually n = 1.2. When the volume of the pressure chamber 321 decreases from the initial volume Vo to (Vo-s · Aa), the following equation (2) is established.
[0050]
P · (Vo−s · Aa) n = Pi · Von (2)
In Expression (2), s is the displacement amount of the piston 37 (s = 0 at the start of compression), and Aa is the pressure receiving area of the piston 37 with respect to the pressure in the pressure chamber 321.
[0051]
Therefore, the pressure P in the pressure chamber 321 when the volume of the pressure chamber 321 is (Vo−s · Aa) is expressed by the following equation (3).
P = Pi · Von / (Vos−Aa) n (3)
That is, the curve Pb in FIG. 5 is expressed by Expression (3). When the displacement amount s increases, that is, the volume of the pressure chamber 321 decreases, the pressure P in the pressure chamber 321 increases so as to follow a curve Pb as indicated by an arrow U1 in FIG. The pressure Pm in FIG. 5 is a pressure when the volume (Vo-s · Aa) of the pressure chamber 321 is minimum. The maximum pressure Pm increases as the maximum value of the displacement amount s increases, that is, as the moving distance from the top dead center position to the bottom dead center position of the piston 37 increases. As the maximum value of the displacement amount s increases, the initial injection pressure at the weft insertion nozzle 47 increases, and the pressure reduction gradient of the injection pressure increases. The maximum value of the displacement amount s can be changed by changing the screwing position of the bolt 62 with respect to the support plate 60.
[0052]
When the piston 37 moves from the bottom dead center position toward the top dead center position, that is, when the displacement amount s decreases, the pressure P in the pressure chamber 321 follows a curve Pb as shown by an arrow U2 in FIG. Reduce the pressure to
[0053]
A curve Go in FIG. 6 represents an actual pressure change in the water storage chamber 641, and a curve Fo represents an actual water injection pressure change in the weft insertion nozzle 47. In this case, for example, a relationship of S2 / S1 = 20 is set between the pressure receiving area S1 of the plunger 35 with respect to the water pressure in the water storage chamber 641 and the pressure receiving area S2 (> S1) of the piston 37 with respect to the air pressure in the pressure chamber 321. The semi-initial pressure Pi is set to 0.2 MPa. If the flow path loss, the friction in the seal rings 36 and 38, the inertial force of the plunger 35 and the inertial force of the piston 37 are ignored, the water injection pressure at the weft insertion nozzle 47 at the end of water injection is 0.2 · S2 / S1 = 4 MPa.
[0054]
The following effects can be obtained in the first embodiment.
(1-1) When the cloth type is changed, the water injection timing in the weft insertion nozzle 47 is often changed. The water injection timing data stored in the control device 57 can be easily changed by operating the control data input device 58. The drive source of the electromagnetic on-off valve 45 is its own solenoid unit and is independent of the loom drive motor M. The switching control in the electromagnetic on-off valve 45 independent of the loom driving motor M makes it easy to change the timing of water supply from the weft insertion pump 64 to the weft insertion nozzle 47, that is, the water injection timing.
[0055]
(1-2) The open / close state of the electromagnetic on-off valve 49 (that is, the water supply switching state of the first water supply switching means) is switched by electrical command control of the control device 57. That is, the high-pressure water supply timing from the plunger pump 52 to the weft insertion pump 64 is controlled by an electrical command from the control device 57. The excitation / demagnetization timing data of the electromagnetic on-off valve 49 stored in the control device 57 can be easily changed by operating the control data input device 58. The drive source of the electromagnetic on-off valve 49 is its own solenoid unit and is independent of the loom drive motor M. Switching control in the electromagnetic on-off valve 49 independent of the loom drive motor M makes it easy to change the timing of high-pressure water supply from the plunger pump 52 to the weft insertion pump 64.
[0056]
(1-3) The air pressure in the pressure chamber 321 in the air cylinder 32 depends on the pressure adjustment state in the pressure adjustment valve 41. The pressure adjustment state of the pressure adjustment valve 41 that influences the pressure in the pressure chamber 321 (that is, the pressure adjustment state in the pressure adjustment means) is controlled by an electrical command from the control device 57. When the cloth type is changed, the water injection pressure at the weft insertion nozzle 47 is often changed. The data of the quasi-initial pressure Pi stored in the control device 57 can be easily changed by operating the control data input device 58. The control of the pressure adjustment state in the electric pressure adjustment valve 41 facilitates the change of the water injection pressure in the weft insertion nozzle 47.
[0057]
(1-4) Curves Ce, Cf, Cg, and Ch in the graphs of FIGS. 7 (e), (f), (g), and (h) indicate the water injection pressure in a water injection device using a conventional coil spring. The measurement result of change is shown. Curves Ca, Cb, Cc, and Cd in the graphs of FIGS. 7A, 7B, 7C, and 7D indicate changes in the water injection pressure in the water injection device of the present embodiment using air spring means. The measurement result is shown. 7A and 7E show the case where the loom rotation speed is 700 rpm and the quasi-initial pressure Pi in the pressure chamber 321 is 0.25 MPa. FIGS. 7B and 7F show the case where the loom rotation speed is 800 rpm and the quasi initial pressure Pi in the pressure chamber 321 is 0.3 MPa. FIGS. 7C and 7G show the case where the loom speed is 900 rpm and the quasi-initial pressure Pi in the pressure chamber 321 is 0.4 MPa. FIGS. 7D and 7H show the case where the loom speed is 1000 rpm and the quasi-initial pressure Pi in the pressure chamber 321 is 0.5 MPa. Further, S2 / S1 described above is 11.2, and the ratio of the minimum volume to the maximum volume in the pressure chamber 321 is 0.64.
[0058]
In the water injection device of the present embodiment using the air spring means as the drive source for generating the water injection pressure in the weft insertion pump, the water injection pressure caused by surging vibration is greatly undulated at any rotational speed of the loom. There is no fluctuation (pressure pulsation). However, when a conventional water injection device using a coil spring is used as a drive source for generating a water injection pressure in a weft insertion pump, the water injection pressure caused by surging vibration at a specific loom rotational speed greatly undulates. The fluctuation (pressure pulsation) becomes remarkable. Such pressure pulsations increase the diffusion of the water jet. If the diffusion of the water jet increases, the warp yarn is likely to be damaged, and the weft posture in the latter half of the weft insertion becomes unstable and a weft insertion failure is likely to occur.
[0059]
In the air spring means that uses the pressure of air, which is a compressible fluid, as a spring force, surging vibration is very small compared to a coil spring. For this reason, there is little fluctuation (pressure pulsation) in which the water injection pressure undulates due to surging vibration. The occurrence of pressure pulsation when using a coil spring becomes more pronounced as the loom speed increases, but in the water jet device of the present embodiment using air spring means, the loom speed is 1000 rpm. No pressure pulsation due to surging vibration is observed even when the number is increased. Therefore, even in a high speed rotation state of the loom such as 1000 rpm, there is no warp damage and the weft Y is stably inserted. The stable weft insertion of the weft Y in the high speed operation of the loom enables the loom to operate at high speed without impairing the fabric quality.
[0060]
(1-5) In the case of the conventional water injection device shown in FIGS. 16 and 17, when the water inertia force and the pipe frictional resistance are ignored as being small, the following equation (4 ) Holds the equation of motion.
[0061]
m · d2x / dt2 = (H−k · x) + (Pa−Po) · Ap (4)
In Expression (4), m is the total equivalent mass of the movable bodies of the power transmission system such as the cam lever 22, the plunger 14, the coil spring 18, and the spring seat 15, x is the displacement of the plunger 14, and d2x / dt2 is the acceleration of the plunger 14. , K is the spring constant of the coil spring 18, H is the compression load of the coil spring 18 at the start of water injection, Po is the pressure in the water storage chamber 123, Pa is atmospheric pressure, and Ap is the cross-sectional area of the plunger 14.
[0062]
If the formula (4) is arranged for the pressure Po of the water storage chamber 123, that is, the water injection pressure, the following formula (5) is obtained.
Po = Pa + (Hk * xm * d2x / dt2) / Ap (5)
In Expression (5), at the water injection start stage, first, the mass m is rapidly accelerated by the spring force H. Next, when the acceleration is finished, that is, when the inertial force m · d2x / dt2 approaches zero, water injection proceeds while the spring force (Hk · x) and the pressure Po are balanced. In the course of water injection, the water injection pressure is high when the initial displacement x is small, but the water injection proceeds and the coil spring 18 is restored. That is, as the displacement x increases, the water injection pressure Po gradually increases. It will decline. Immediately before the end of water injection, the water injection pressure Po takes the lowest value during the water injection period. When all of the water sucked into the water storage chamber 123 has been injected, the cam follower 221 collides with the stopper 28 or the cam 23, and the water injection pressure Po. Drops to atmospheric pressure.
[0063]
The mass m in the equation (4) is the sum of the equivalent masses of the movable bodies of the power transmission system. The smaller the mass m, the higher the initial speed when the plunger 14 moves backward, that is, the rising speed of the water injection pressure. In the water injection device of the present embodiment that does not use a coil spring, the mass m in equation (4) is smaller than that of a conventional water injection device that uses a coil spring. The reduction of the mass m due to the absence of the coil spring increases the rising speed of the water injection pressure and suppresses the occurrence of the “catch-up phenomenon” of the jet. Therefore, the disturbance of the spray shape at the front end of the jet due to the “catch-up phenomenon” of the jet is suppressed. As a result, a situation in which high-speed water droplets collide with the warp and damage the warp is avoided, and deterioration of the fabric quality due to warp generation is avoided.
[0064]
(1-6) The pressure change obtained by the water injection device of the present embodiment is as shown in FIG. 5, but the pressure gradient in the time change during the water injection stroke is expressed by the following equation (6). The
[0065]
dP / dt = (dP / ds) (ds / dt) (6)
The pressure gradient dP / dt in the conventional water injection device using the coil spring 18 shows a relatively linear change if no disturbance such as a surge occurs. On the other hand, the pressure gradient dP / dt in the present embodiment using the air spring means is a curve obtained by differentiating the equation (5) by the displacement amount s in consideration of dP / ds. Depending on the design, it is also possible to realize changes that deviate significantly from the straight line.
[0066]
(1-7) The check valve 42 serves to block the communication between the pressure regulating valve 41 and the pressure chamber 321 when compressing the air in the pressure chamber 321, and the minimum pressure (that is, pressure regulation) of the pressure chamber 321. It plays the role which prescribes | regulates the quasi initial pressure Pi) set by the valve 41, and the role which replenishes the amount of air leaks when air leaks from the pressure chamber 321.
[0067]
If the sealing function by the seal rings 36 and 38 is complete and there is no air leakage from the pressure chamber 321, air does not enter and exit the check valve 42 during operation of the loom unless the pressure adjustment valve 41 is operated. The check valve 42 is merely acting as a stop valve.
[0068]
When there is no air leakage from the pressure chamber 321, the pressure in the pressure chamber 321 can not be reduced by the action of the check valve 42 even though the pressure can be increased by operating the pressure regulating valve 41. The throttle passage 43 positively leaks the air in the pressure chamber 321 slightly toward the pressure regulating valve 41 side. The configuration in which the throttle passage 43 is provided in parallel with the check valve 42 enables the pressure chamber 321 to be depressurized when the sealing function by the seal rings 36 and 38 is fully functioning. This depressurizable configuration makes it possible to set the quasi-initial pressure Pi in the pressure chamber 321. The air pressure source 39, the pressure regulating valve 41, the check valve 42, and the throttle passage 43 constitute a quasi-initial pressure setting means for setting a quasi-initial pressure in the fluid spring means.
[0069]
The air in the pressure chamber 321 starts to compress from the state of the quasi-initial pressure Pi set by the quasi-initial pressure setting means. The pressure in the pressure chamber 321 during the water injection process is equal to or higher than the quasi-initial pressure Pi. Since the stroke of the piston 37 is constant for each weft insertion, the pressure when the air in the pressure chamber 321 is compressed to the maximum is always constant. Therefore, water injection is started under the state of the pressure Pm when the air in the pressure chamber 321 is compressed to the maximum. The water injection pressure at the initial stage of water injection always coincides with the pressure Pm higher than the quasi-initial pressure Pi set by the pressure adjusting valve 41, and the water injection pressure in the water injection process is in the range of the pressure Pm or less and Pi or more. Therefore, it is possible to indirectly control the pressure at the beginning of water injection, which is an important factor for weft insertion, and to adjust the water injection pressure with high accuracy.
[0070]
(1-8) The bottom dead center position of the piston 37 can be changed by changing the screwing position of the bolt 62 with respect to the support plate 60. The bolt 62 and the lock nut 63 constitute position restricting means capable of changing the bottom dead center position of the piston 37. Changing the bottom dead center position of the piston 37 changes the ratio of the minimum volume to the maximum volume of the pressure chamber 321. That is, the compression ratio of the air in the pressure chamber 321 can be easily changed by changing the screwing position of the bolt 62 with respect to the support plate 60. The pressure at the beginning of water injection, which is an important factor for weft insertion, can be easily changed by a simple operation of changing the screwing position of the bolt 62.
[0071]
(1-9) In the conventional water jetting apparatus shown in FIG. 16, the collision between the cam surface 231 of the cam 23 and the cam follower 221 and the collision between the cam lever 22 and the stopper 28 are large sources of vibration. In the present embodiment, since there is no cam mechanism, noise generated in the water injection device is significantly reduced. This makes it possible to speed up the water jet loom without deteriorating the working environment in the factory.
[0072]
Next, a second embodiment of FIGS. 8 to 10 will be described. The same reference numerals are used for the same components as those in the first embodiment.
An electromagnet 66 is attached to the bolt 62, and a magnetic body 67 is fixed to the upper end of the plunger 35. The electromagnet 66 is subjected to excitation / demagnetization control of the control device 57A having the same function as the control device 57 in the first embodiment. As shown in FIG. 9, when the magnetic body 67 is in contact with the electromagnet 66, that is, when the piston 37 is at the bottom dead center position, the magnetic body 67 is attracted to the electromagnet 66 by the excitation of the electromagnet 66. The state is retained.
[0073]
The electromagnetic open / close valve 45 is excited after the electromagnetic open / close valve 49 is demagnetized and before the timing before water injection is started. The electromagnet 66 is demagnetized at the water injection start timing after the excitation start of the electromagnetic on-off valve 45. Thus, the magnetic body 67 is released from the attracting action of the electromagnet 66, and the piston 37 moves from the bottom dead center position toward the top dead center position as shown in FIG. Water in the water storage chamber 642 in the weft insertion pump 64A is pumped to the weft insertion nozzle 47 as the piston 37 moves from the bottom dead center position to the top dead center position, and water injection at the weft insertion nozzle 47 is started. .
[0074]
The electromagnet 66 and the magnetic body 67 constitute holding means that can be switched between a state where the piston 37 can be held at the bottom dead center position and a state where the piston 37 cannot be held. This holding means is a second water supply state switching means for switching between a state where water can be supplied from the weft insertion pump 64 to the weft insertion nozzle 47 and a state where water cannot be supplied. The electromagnetic on-off valve 45 in the second embodiment is a third for blocking water supply to the weft insertion nozzle 47 when supplying high-pressure water from the water supply source 29 to the weft insertion pump 64A to the weft insertion nozzle 47. This is a water supply state switching means. The control device 57A serves as a holding control means for electrically switching the holding means between a holdable state and a non-holdable state.
[0075]
The start of water injection depends on the demagnetization of the electromagnet 66. Therefore, the excitation of the electromagnetic on-off valve 45 starts from the timing of switching the excitation of the electromagnetic on-off valve 49 to demagnetization (that is, the timing at which the piston 37 reaches the bottom dead center position), ie, the excitation of the electromagnet 66. Until the demagnetization timing). This provides a margin for the opening operation by excitation of the electromagnetic on-off valve 45. Therefore, an electromagnetic on-off valve with a low response speed can be adopted as the electromagnetic on-off valve 45.
[0076]
The electromagnetic on-off valve has a problem in that the higher the response speed, the greater the impact force when the valve body collides with the valve seat, and the valve body or the valve seat wears earlier and the sealing performance is impaired earlier. Moreover, an electromagnetic on-off valve with a high response speed is expensive. The configuration employing an electromagnetic on-off valve with a low response speed as the electromagnetic on-off valve 45 contributes to cost reduction and improved reliability of the water injection device.
[0077]
Next, a third embodiment of FIGS. 11 and 12 will be described. The same components as those in the second embodiment are denoted by the same reference numerals.
The difference from the second embodiment is that an electromagnetic three-way valve 68 is used in place of the electromagnetic on-off valves 49 and 45 in the second embodiment. The electromagnetic three-way valve 68 is subjected to excitation / demagnetization control of a control device 57B having the same function as that of the control device 57A in the second embodiment. FIG. 11 shows the excitation state of the electromagnetic three-way valve 68. The excitation state of the electromagnetic three-way valve 68 is a state in which high-pressure water pumped from the plunger pump 52 can be supplied to the water storage chamber 643 in the weft insertion pump 64B, and water in the water storage chamber 643 cannot be supplied to the weft insertion nozzle 47. The piston 37 is at the bottom dead center position. FIG. 12 shows a demagnetized state of the electromagnetic three-way valve 68. The demagnetized state of the electromagnetic three-way valve 68 is a state in which high-pressure water pumped from the plunger pump 52 cannot be supplied to the water storage chamber 643 and water in the water storage chamber 643 can be supplied to the weft insertion nozzle 47. The piston 37 is in the process of moving from the top dead center position toward the bottom dead center position.
[0078]
The electromagnetic three-way valve 68 also serves as a first water supply state switching unit and a third water supply state switching unit.
In the third embodiment, the number of solenoid valves can be reduced as compared with the first and second embodiments, and the water injection device can be further reduced in size and cost.
[0079]
Next, a fourth embodiment shown in FIGS. 13 and 14 will be described. The same reference numerals are used for the same components as in the third embodiment.
The difference from the third embodiment is that an electromagnetic rotary valve 69 is used instead of the electromagnetic three-way valve 68 in the third embodiment. The electromagnetic three-way valve 68 is subjected to excitation / demagnetization control of a control device 57C having the same function as that of the control device 57A in the second embodiment. FIG. 13 shows the excitation state of the electromagnetic rotary valve 69. The excitation state of the electromagnetic rotary valve 69 is a state in which high-pressure water pumped from the plunger pump 52 can be supplied to the water storage chamber 642 and water in the water storage chamber 642 cannot be supplied to the weft insertion nozzle 47. The piston 37 is at the bottom dead center position. FIG. 14 shows a demagnetized state of the electromagnetic rotary valve 69. The demagnetized state of the electromagnetic rotary valve 69 is a state in which high-pressure water pumped from the plunger pump 52 cannot be supplied to the water storage chamber 642 and water in the water storage chamber 642 can be supplied to the weft insertion nozzle 47. The piston 37 is in the process of moving from the top dead center position toward the bottom dead center position.
[0080]
The electromagnetic rotary valve 69 also serves as a first water supply state switching unit and a third water supply state switching unit.
In the fourth embodiment, the same effects as in the third embodiment can be obtained.
[0081]
Next, a fifth embodiment of FIG. 15 will be described. The same reference numerals are used for the same components as those in the first embodiment.
A weft insertion pump 64 for injecting the wefts Y1, Y2, Y3 from a plurality of weft insertion nozzles 47, an electromagnetic on-off valve 45, a flow path block 30, and a pressure adjustment valve 41 are accommodated in the housings 701, 702, 703. . The housings 701, 702, and 703 and their storage parts constitute separate water injection devices. A single electromagnetic on-off valve 49 communicates with the flow path 301 in the flow path block 30 in each housing 701, 702, 703 via a common pipe 71 and branch pipes 711, 712, 713. A single electromagnetic on-off valve 49 is a common component of the separate water injection devices. Check valves 72, 73, and 74 are interposed on the branch pipe lines 711, 712, and 713. When the electromagnetic open / close valve 45 is in the closed state, the water sent to the water storage chamber 641 of each weft insertion pump 64 waits for injection in a state where the high pressure state is maintained by the presence of the check valves 72, 73, 74. ing.
[0082]
In the control device 57D having the same function as the control device 57 in the first embodiment, weft selection pattern data is inputted and stored by an input operation of the control data input device 58D. The control device 57D selects and demagnetizes one of the plurality of electromagnetic on-off valves 45 for every weft insertion based on preset weft selection pattern data. As a result, only one of the wefts Y1, Y2, Y3 is selected and injected from the weft insertion nozzle 47 to be inserted.
[0083]
In the conventional water jetting apparatus shown in FIG. 16, two-color weft insertion is the limit due to restrictions such as the size of the apparatus and mounting conditions. Since the water injection device using the air spring means as the drive source for generating the water injection pressure is very compact as compared with the conventional water injection device, the weft insertion exceeding two colors is possible as in the fifth embodiment. Is possible. In the fifth embodiment, a single electromagnetic on-off valve 49 is commonly used as the first water supply state switching means for controlling the supply of high-pressure water to the plurality of weft insertion pumps 64. Therefore, the entire water injection device for multicolor weft insertion becomes more compact, and the effect of reducing the device cost is remarkable. In the fifth embodiment, since the weft insertion pump 64 and the electromagnetic on-off valve 45, which are noise sources, are housed in the housings 701, 702, and 703, noise is further reduced compared to the case of the first embodiment. To do. The inventor of the present application measured and compared the noise between the prototype device of the present embodiment and the conventional device. As a result, the noise in the prototype device of the present embodiment was 10 dB or more smaller than that of the conventional device. .
[0084]
In the present invention, the following embodiments are also possible.
(1) In the first embodiment, an electromagnetic on-off valve is interposed on the throttle passage 43, and the on-off control of the electromagnetic on-off valve is controlled only when the quasi-initial pressure Pi changes due to the change of the cloth type.
[0085]
(2) In the first and second embodiments, instead of the electromagnetic on-off valve 49, a mechanical on-off valve that opens and closes in synchronization with the loom rotation is used. The mechanical on-off valve can be used because there is a margin in the switching operation of the second water supply state switching means.
[0086]
(3) Use fluid spring means that uses a pressure of a compressible gaseous fluid other than air, for example, an inert gas (nitrogen gas, carbon dioxide, etc.) as a spring force.
(4) A weft insertion pump using a coil spring shown in FIG. 17 as a spring means is employed in the present invention.
[0087]
(5) A management computer for managing a large number of water jet looms and a computer with a built-in loom are connected by communication, and a large number of water jet looms are remotely operated via the management computer.
[0088]
(6) The water injection timing or the water injection pressure is feedback controlled based on the operation data of the water jet loom.
[0089]
【The invention's effect】
As described in detail above, in the present invention, High-pressure water is needed to move the piston toward the bottom dead center by overcoming the load that the spring means biases the piston toward the top dead center. Wet pump from water supply To Since the drive source of the second water supply state switching means for switching between the state in which water can be supplied from the weft insertion pump to the weft insertion nozzle and the state in which it cannot be supplied is made independent of the loom drive source, the water jet loom It is possible to provide a water jet device suitable for the automation of the above.
[Brief description of the drawings]
FIG. 1 shows a first embodiment, and (a) is an overall view of a water injection device. FIG. 4B is a simplified diagram showing the excitation / demagnetization state of the electromagnetic on-off valves 49 and 45.
FIG. 2A is a cross-sectional view of a main part showing a state where a piston 37 is at a bottom dead center position. FIG. 4B is a simplified diagram showing the excitation / demagnetization state of the electromagnetic on-off valves 49 and 45.
FIG. 3A is a cross-sectional view of a principal part showing a state in which a piston 37 is moving from a bottom dead center position to a top dead center position. FIG. 4B is a simplified diagram showing the excitation / demagnetization state of the electromagnetic on-off valves 49 and 45.
FIG. 4 is a graph showing excitation / demagnetization timing of electromagnetic open / close valves 45, 49, injection pressure change in weft insertion nozzle 47, and pressure change in pressure chamber 321;
FIG. 5 is a graph showing the relationship between the volume of the pressure chamber 321 and the pressure in the pressure chamber 321;
6 is a graph showing a change in injection pressure in the weft insertion nozzle 47 and a pressure change in the pressure chamber 321. FIG.
FIGS. 7A, 7B, 7C, and 7D are graphs showing measurement results of changes in water injection pressure in the water injection device of the present embodiment using air spring means. (E), (f), (g), (h) is a graph which shows the measurement result of the change of the water injection pressure in the water injection apparatus using the conventional coil spring.
FIG. 8 is an overall view of a water injection device showing a second embodiment.
FIG. 9 is a cross-sectional view of a principal part showing a state where a piston 37 is at a bottom dead center position.
FIG. 10 is a cross-sectional view of a principal part showing a state where a piston 37 is moving from a bottom dead center position to a top dead center position.
FIG. 11 is an overall view of a water injection device showing a third embodiment.
FIG. 12 is an overall view of the water ejection device showing a state in which a piston 37 is moving from a bottom dead center position to a top dead center position.
FIG. 13 is an overall view of a water injection device showing a fourth embodiment.
FIG. 14 is an overall view of the water injection device showing a state in which a piston 37 is moving from a bottom dead center position to a top dead center position.
FIG. 15 is an overall view of a water injection device showing a fifth embodiment.
FIG. 16 is an overall view of a conventional water injection device.
17 is a side sectional view of the weft insertion pump 11. FIG.
FIG. 18 is a graph showing a relationship between a loom rotation angle and a cam lift amount.
[Explanation of symbols]
29 ... Water supply source. 32. An air cylinder as a fluid cylinder constituting the fluid spring means. 321 ... Pressure chamber constituting fluid spring means. 33: A water cylinder constituting a weft insertion pump. 35 ... Plunger constituting a weft insertion pump. 37. Piston constituting the fluid spring means. 39: An air pressure source as a fluid supply source. 41 ... Pressure adjusting valve as pressure adjusting means. 43: A throttle passage. 45. An electromagnetic on-off valve serving as a second and third water supply state switching means. 47 ... Weft insertion nozzle. 49. An electromagnetic on-off valve serving as a first water supply state switching means. 57, 57A, 57B, 57C, 57D... Control device constituting injection pressure control means and switching control means. 58, 58D: Control data input device. 62... Bolts that constitute position restricting means. 63 ... A lock nut constituting the position restricting means. 64, 64A, 64B ... Weft insertion pump. 66: An electromagnet constituting holding means as second water supply state switching means. 67: A magnetic body constituting holding means as second water supply state switching means. 68: An electromagnetic three-way valve serving as first and third water supply state switching means. 69: An electromagnetic rotary valve serving as first and third water supply state switching means.

Claims (11)

Water is pumped to the weft insertion nozzle by a weft insertion pump that urges the piston in the cylinder in the direction of top dead center by a spring means, and water is injected from the weft insertion nozzle. In the water jet device in the water jet loom to put,
A water supply source capable of supplying the cylinder with high-pressure water that only overcomes the load by which the spring means urges the piston in the direction of top dead center and moves the piston in the direction of bottom dead center ;
First water supply state switching means for switching between a state in which high-pressure water can be supplied from the water supply source to the weft insertion pump and a state in which the high-pressure water cannot be supplied;
A second water supply state switching means capable of switching between a state where water can be supplied from the weft insertion pump to the weft insertion nozzle and a state where water cannot be supplied;
A third water supply for switching to a state where water can be supplied and a state where water cannot be supplied, and for blocking water supply to the weft insertion nozzle when high pressure water is supplied from the water supply source to the weft insertion pump State switching means,
A water jet device in a water jet loom, wherein a drive source of the second water supply state switching means is independent of a loom drive source.   The water jet device in the water jet loom according to claim 1, further comprising switching control means for electrically controlling a water supply switching state of the second water supply state switching means.   The drive source of the first water supply state switching unit is independent from the loom drive source, and the water supply switching state of the first water supply state switching unit is electrically controlled by the switching control unit. Item 3. The water jet device in the water jet loom according to any one of items 2 to 3.   The said spring means is a fluid spring means which has a pressure chamber which accommodates the gaseous fluid which can be compressed, and made the pressure of the fluid in the said pressure chamber into a spring force. The water-jet apparatus in the water jet loom described in 1.   5. The water jet device in a water jet loom according to claim 4, wherein the fluid spring means is air spring means using air pressure as a spring force.   The spring force adjusting means for adjusting the fluid spring force in the fluid spring means, and the injection pressure control means for electrically controlling the spring force adjustment state in the spring force adjusting means. The water-jet apparatus in the water jet loom according to any one of the above.   The spring force adjusting means includes a fluid supply source for supplying a high-pressure fluid to the pressure chamber of the fluid spring means, and a pressure adjusting means for adjusting the pressure of the fluid supplied to the fluid spring means. The water jet device in the water jet loom according to claim 6, wherein the pressure adjustment state in the pressure adjustment means is electrically controlled by the injection pressure control means. The fluid spring means includes a fluid cylinder, a piston accommodated in the fluid cylinder, and the pressure chamber defined in the fluid cylinder by the piston, and is located below the top dead center position of the piston. The movement to the dead center position is caused by sending high-pressure water to the weft insertion pump, and the movement from the bottom dead center position to the top dead center position for supplying water from the weft insertion pump to the weft insertion nozzle is The water jet device in the water jet loom according to any one of claims 4 and 7, which is generated by a pressure of fluid in the pressure chamber . The water jet device in the water jet loom according to claim 8 , further comprising position restricting means capable of changing a bottom dead center position of the piston . The second water supply state switching means is holding means for switching the piston between a state where the piston can be held at the bottom dead center position and a state where the piston cannot be held, and the switching control means is a state where the piston can be held and held. The water jet loom according to claim 8 or 9, further comprising a position restricting means capable of changing a bottom dead center position of the piston, which is a holding control means for electrically switching and controlling the holding means to an impossible state . Water injection device. The water jet loom is for inserting a plurality of wefts using a plurality of water injection devices, and the first water supply state switching means in the plurality of water injection devices is replaced by a single first water supply state switching means. The water jet device in the water jet loom according to any one of claims 1 and 10, which is shared .

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