JPH026863A - Spray valve device and control system - Google Patents

Abstract

PURPOSE: To facilitate adjustment by providing the through-hole of a valve housing of a spray valve device for a printing press roller with a width enough for removing a valve stem from a plunger at the time of attaching and detaching a nozzle means to and from a valve means. CONSTITUTION: The valve 40 of the pulse type liquid spray device is constituted, by mounting the solenoid plunger 104 freely movably back and forth into the through-hole 72 of the valve housing 70 and cooperating the front sealing surface 122 of a freely attachable and detachable valve stem 110 with the valve seat 50 of the nozzle 38 held by a cap 60 via a main body 118 screwed to the valve housing 70. The liquid from an inlet 11 is sprayed via the nozzle 38 from a slit 54 by the actuation of the solenoid 96. The through-hole has such a sufficient width as to disengage the valve stem 110 forward from the plunger 104 at the time of removing the nozzle 38 from the valve 40 and, therefore, the exchange of the sealing surface 122 is made possible with min. disassembly. The easy execution of the adjustment of the spray system is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid atomizing device, particularly of the type used in pulsed atomizing systems.

[Prior Art] Various systems have been proposed in the past for supplying liquid to the rollers of printing presses. These liquids can be used, for example, to wet or clean the rollers, or to prevent printing misalignment. One type of system wets the roller by spraying most of the liquid from a nozzle arrangement located adjacent to the roller. Typically, a plurality of nozzle devices are arranged to align with the spray bar.

Spraying deviceFor conventionally used spraying devices, please refer to attached No. 11.
This will be explained in detail later with reference to FIGS. 13 to 13. In short, this spray device is characterized by a nozzle section and a valve with a plunger positioned at a considerable distance behind this nozzle section. Pressurized fluid is supplied to the valve and flows towards the reservoir when the valve is closed and towards the nozzle section when the valve is open. The plunger is reciprocated by a solenoid to generate a pulsating spray.

If the front sealing surface of the plunger becomes worn, replacing the plunger requires disassembly of the solenoid mechanism. This is a time consuming operation that must be performed periodically on the entire nozzle system. Additionally, the need to direct liquid to the reservoir when the valve is closed results in wasted liquid that must be disposed of. On the other hand, if the feature of directing the pressurized liquid into the reservoir is removed, an excessive pressurization of the residual liquid remaining in the passage between the nozzle member and the valve plunger upon opening of the valve will occur, resulting in an excess of l. It has been found that this results in liquid being sprayed and further leakage of liquid after the valve is closed. However, by directing the pressurized liquid into the reservoir, no pressure build-up occurs.

Accordingly, it would be desirable to provide a spray device that allows sealing surfaces to be replaced with a minimum of time and effort, does not create excessive pressure build-up, and does not require disposal of unused fluid.

Atomizer Control U.S. Pat. No. 4,469,024 to Schwartz et al. relates to a pulsed atomizer in which the amount of liquid ejected is controlled by a measured press speed. In the disclosed embodiment, a speed sensor generates a sinusoidal sensor signal having a frequency related to press speed. A pulse width regulator receives this sinusoidal sensor signal and generates a square wave control signal in which the pulse duration is maintained constant. The time between pulses in a square wave control signal varies as a function of speed. The control signal is converted into a pneumatic pulse that is used to actuate an air-operated valve to deliver liquid to the atomizing nozzle.

Another misting system is Swittall.
It is disclosed in US Patent No. 4,649.818 related to et al. The speed sensor generates a sensor signal to a master controller that selects one of a plurality of oscillating electrical signals having respective frequencies based on the sensor signal value.

The selected frequency signal is applied to a monostable circuit that generates pulses of constant length in response to the leading edge of each cycle of the frequency signal. A monostable pulse is then used to activate the spray nozzle solenoid. The width of the monostable pulse can be manually adjusted.

U.S. Patent No. 3.9 for Alsop
Japanese Patent No. 26,115 discloses a spraying device that temporarily changes the liquid level by partially or completely interrupting the spray. It is also possible to change the spray amount by grounding a solid obstacle in the spray passage 7 or by using a direction-changing air blower. In the atomizer disclosed in US Pat. No. 3,924,531 to Klinger, the amount of spray can be controlled by changing the positions of various device members.

All of these known atomizers have some drawbacks. For example, pulsed atomizers often encounter difficulties resulting in poor atomization patterns. In systems where the amount of atomizer is varied by varying the rONJ time of the atomizer nozzle, control of the amount of atomizer output during low speed press imitation is limited by physical limitations in the atomizer nozzle, valves, etc. Additionally, in systems where the rOFFJ time of the spray nozzle is controlled, the controller is limited by the potential for drying out when there are long periods between spray pulses.

Systems that use physical techniques to change the spray volume are
Difficulties are encountered in obtaining a suitable spray pattern. Therefore, there is a need for a misting system that overcomes the difficulties encountered with conventional misting systems.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide a misting system that can be easily and effectively adjusted to changes in operating parameters.

A further object of the invention is to provide a spraying system with an improved spray pattern.

It is further an object of the present invention to provide an improved pulsed atomization system for wetting a printing press roller, such that the amount of atomization liquid sprayed onto the roller is varied depending on the speed of the printing press and a programmed atomization curve. Our goal is to provide the following.

[Means for Solving the Problems] Spraying Device According to the present invention, a liquid spraying device includes a valve and a nozzle detachably attached to the valve. The nozzle has a liquid outlet at its tip and a valve seat at its rear end. The valve is
It consists of a valve housing with a through hole communicating with the liquid inlet. A solenoid plunger is slidably mounted within the through hole for reciprocating movement therein. The valve stem is removably attached to the tip of the plunger and includes a front sealing surface arranged to contact the valve seat. The valve seat, valve stem, plunger, and nozzle are coaxially arranged. The through hole is wide enough to allow the valve stem to be forwardly removed from the plunger when the nozzle is removed from the valve. Therefore, minimal device disassembly is required to replace the sealing surface. The presence of a valve seat directly on the valve nozzle prevents excessive pressure build-up in the liquid being atomized.

Atomizer Control According to the present invention, the atomizer control system includes means for sensing printing press speed. A rectangular pulse sequence is generated depending on the sensed press speed. When the detected press speed is lower than a certain value, each pulse in the rectangular pulse sequence has a constant duration, and the time between adjacent pulses varies depending on the press speed. When the pressing speed is higher than a certain value, the time between adjacent pulses is constant, and the duration of the pulses varies depending on the sensing speed.

The spray nozzle is activated in response to a rectangular pulse sequence.

Accordingly, according to features of the present invention, problems associated with the prior art are minimized or eliminated.

[Embodiments] Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.

FIG. 1 shows a part of an offset printing apparatus 10,
The device comprises a plate cylinder roll 12, a small roll 14, a warming roll 16 and a spraying mechanism 18 according to the invention. Atomizing mechanism 18 may contain certain additives. For example, a pulsating spray of a wetting liquid, such as water, is emitted, and the liquid is sprayed onto a moisture absorbing roll and from there transferred to a wooden mold roll.

The atomizing mechanism includes a housing 30 on which a plurality of atomizing devices 32 are mounted. These spray devices 32 have liquid inlet conduits 34 for containing pressurized wetting fluid.
are connected in parallel by separate take-off lines 36, which lead from the inlet conduit 34 to each nozzle device.

Each spray device 32 includes a nozzle section 38 and a valve section 40. The nozzle section 38 includes a generally cylindrical nozzle housing 42 (FIG. 7), which has a transverse slot 44 at its distal end. A nozzle member 46, preferably made of a hard, wear-resistant material such as tungsten carbide, is press-fitted into the central hole of the nozzle housing 42. A retaining ring 48 is press-fitted into the rear end of the center hole, and a valve seat 50 is press-fitted into the center hole of the ring 48. The valve seat has a generally hollow cylindrical shape and has a beveled end 52 . The nozzle member 46 has a slit 54 at its tip, and this slit 54 is connected to the nozzle member 46.
The valve seat 50 communicates with a central passage 56 of the valve seat 50 through a central passage 58 thereof.

The nozzle housing 42 has a batter field.
terf 1eld) U.S. Pat. No. 4,527.
It is removably disposed at the tip of a through hole 59 formed in a cap 60 (FIG. 6) of the type described in Japanese Patent No. 745. Cap 60 includes a slot 62 in its outer wall for reasons explained below.

Valve section 40 (FIG. 6) includes a valve housing 70 having a through hole 72 and internal threads 74 at its distal end. For example, a liquid, such as a warming solution, is supplied to the valve housing 70 via a boat 71, which port 71 can be threaded to receive a corresponding threaded conduit. A hollow post 76 is detachably attached to the rear end of the valve housing. This boss 76 is provided with an enlarged flange 78 at its tip, which is fitted into a fitting 80 located at the rear end of the through hole 72.

The plate 82 has a central opening 84 through which the post 7
6 passes through the plate 82 and the rear side 8 of the valve housing 70.
6 by screws 88.

A resilient sealing ring 90 is disposed between plate 82 and flange 78 and engages flared rear end 92 of mantle 80 to form a liquid-tight seal.

A conventional plug-in electromagnetic coil casing 96 is attached to the rear end of the boss 76. This casing 96 includes a hole 98 through which the post 76 passes.

An annular outer groove 100 is formed at the rear end of the post 76 to accommodate a retaining ring (not shown) or the like for holding the casing 96 on the post. A spring (not shown) can also be placed between the retaining ring and the rear face 97 of the casing to bias the casing against the plate 82. This spring deflects to allow the casing to be slightly displaced away from the plate 82 and rotated about the axis of the post 76, thus repositioning the three bayonet prongs 102.

The post 76 has a hollow tip in which the valve plunger 1 is inserted.
04 is slidably inserted and positioned within the electromagnetic coil casing 96. The plunger is configured to be displaced rearward (ie, upward in FIG. 6) in accordance with the bias of an electromagnetic coil housed within the casing 96. A coil compression spring 106 surrounds the plunger 104 and acts between the flange 78 located at the tip of the plunger 104 and the flange 108 . The flange 108 is
For example, it can be formed by a split retaining ring. That is, when the plunger is moved backward by the electromagnetic coil, the spring 106 is compressed.

A valve shaft 110 is detachably attached to the hollow tip of the plunger. The valve stem 110 includes a bore 112 that is frictionally fitted within the plunger 104 and an enlarged cross-section front portion 114 that slides within a throughbore 116 in a body 118. The body 118 has external threads 120 at its rear end that thread into the internal threads 74 of the valve housing. Main body 118
has an inner bushing 119 within which the tip of the valve shaft 110 slides. The valve shaft has a plurality of longitudinal passages 121 on its outer periphery to guide fluid forward toward the bushing 119 (see FIG. 10).

A disk 12 made of an elastic material is attached to the tip of the valve stem 110.
2 stands out. This disk 122 has a diameter larger than the rear end of the passage 56 formed in the valve seat 50, and has a diameter larger than that of the rear end of the passage 56 formed in the valve seat 50.
06 and comes into sealing contact with the valve seat. Aisle 56.5
It will be appreciated that 8, stem 114, plunger 104, and post 76 are aligned along a common longitudinal axis.

Stem 110 is no larger in cross-section than through-bore 116 of body 118, so stem 114 is no larger than cap 6.
0 and nozzle section 38 can be withdrawn from the plunger 104 and the spray device 3
It can be pulled completely forward from 2.

Instead of being attached by a friction fit, the stem can also be attached to the plunger by other quick release connection mechanisms, such as, for example, a threaded connection.

The nozzle section 38 is attached and detached using the cap 60 in a conventional manner. That is, a slot 62 is disposed in the cap to accommodate a radially projecting lug 124 formed on the outer wall of the body 118. The side wall of the slot 62 includes a cam portion 126 that acts to move the cap toward the body 118 in response to relative rotation. This is the front wall part 12
8 is pressed longitudinally against an elastic sealing ring 130 located between this front wall 128 and the rear wall 132 of the nozzle housing 42. Rotation of the cap in the opposite direction is flexibly prevented by compression ring 130.

Ring 130 also forms a liquid-tight seal after being compressed in this manner.

In operation, pressurized liquid is introduced into the spray device via port 71. When the solenoid is deenergized (ie, when in a non-spraying mode), the valve stem is biased toward the valve seat 50 to close the nozzle member. When the solenoid is energized,
The plunger and stem retract, thereby opening the valve seat. Pressurized liquid is immediately squirted through the slit 54 onto the roll. After the sealing disc 122 is worn, its removal is accomplished by simply unscrewing the body 118 and withdrawing the stem axially from the plunger. Insertion of a new stem is accomplished by reversing this procedure.

Prior Art Nozzle Device The present invention has significant advantages over nozzle devices conventionally used in atomizers. A prior art nozzle arrangement 236 of this type, shown in FIGS. 11-13, includes a nozzle section 238 and a valve section 240. Nozzle section 238 includes a generally cylindrical nozzle housing 242 with a transverse slot 244 at its distal end. A nozzle member 246 preferably made of a hard, wear-resistant material such as tungsten carbide is mounted in the center hole of the nozzle housing 242 .

A retaining ring 248 is press-fitted into the rear end of the center hole.

The nozzle part 246 has a slit 254 at its tip,
This slit 254 communicates with a central passage 258 in nozzle member 246. The nozzle housing 238 is removably disposed at the tip of a through hole formed in a cap 260 (FIG. 12) of the type described in U.S. Pat. No. 4,527.745 to Butterfield et al. be done. Cap 260 includes a slot 262 in its outer wall for reasons explained below.

Valve section 240 includes a valve housing 270 with first and second threaded bores 2 separated by a septum 273.
It has 71.272. Holes 271,272 are aligned with each other and are aligned with passageway 258 in nozzle housing 242.
Also line up. Within the valve housing 270 is a hole 271 .
A third hole 274 is arranged perpendicularly to 272 . This third hole 274 has first and second passages 275A, respectively.
275B makes the first and second holes 271.272
Communicate with. A hollow post 27 is provided at the rear end of the valve housing.
6 is detachably attached. This post 276 has an enlarged flange 278 at its distal end, which corresponds to the third hole 27
4 into the retainer 280 at the rear end. plate 2
82 has a central opening 284 through which the post 276 passes, and the plate 282 is attached to the rear side 286 of the valve housing 270 by screws 288. A resilient sealing ring 290 is interposed between the plate 282 and the flange 278 and in contact with the flared rear end 292 of the sleeve 280 to form a liquid-tight seal.

A conventional plug-in electromagnetic coil casing 296 is attached to the rear end of the post 276. The casing 296 includes a hole 298 through which the post 276 extends. An annular outer groove 300 is formed at the rear end of the post 276 to accommodate a retaining ring (not shown) or the like for maintaining the casing 296 on the post. A spring (not shown) can be placed between this retaining ring and the rear side 297 of the casing to bias the casing toward the plate 282. This spring can be deflected to bias the casing slightly away from plate 282 and rotate about the axis of post 276, thus repositioning the three bayonet prongs 302.

Post 276 includes a hollow tip in which valve plunger 304 is slidably positioned for positioning within electromagnetic coil casing 296 . Plunger is casing 2
96 in the rearward direction (
In other words, it can be biased to the right (in FIG. 12). A coil compression spring 306 surrounds the plunger 304 and acts against flanges 278 and 308 located at the distal end of the plunger 304.

The flange 308 can be formed, for example, by a slit retaining ring. Thus, as the plunger is retracted rearwardly by the electromagnetic coil, spring 306 is compressed to bias the plunger forwardly.

An elastic sealing member 310 is disposed at the tip of the plunger 304, and this sealing member 310 is always subjected to the displacement of the spring 306 when the electromagnetic coil is not biased against the inclined seat 312 surrounding the passage 275A. and touch it. Thus,
Passage 275A is closed while passage 275B remains open.

Plunger 304 has at least one longitudinal passage 31
4, this channel 314 is suitable for guiding the flow of liquid from passage 275B to the rear end of hollow post 276. This liquid circulates around the outer edge of flange 308, passing through channel 314 and an eyelet (not shown) in the rear end of post 276, and thence into a suitable conduit connected to the rear end of post 276. (not shown).

A hollow main body 318 is screwed into the first hole 271, and the nozzle housing 242 can be attached thereto with a cap 260. In this regard, the cap is provided with a slot 262 for receiving a radially projecting lug 324 formed in the outer wall of the body 318. slot 26
The side wall portion of 2 includes a cam member 326 that acts to move the cap toward the body 318 in response to relative rotation.

This connects the front wall of the main body 318 to a resilient sealing ring (
(not shown) in the longitudinal direction.

In operation of the prior art device described with reference to FIGS. 11-13, pressurized fluid is supplied to second hole 272 and flows through passageway 275B. If the solenoid is not energized, valve plunger 304 closes passageway 275A and liquid passes through passageway 314 and from the rear end of post 276 to the appropriate reservoir. When the valve is energized, plunger 304 is retracted to open passageway 275A, allowing liquid to flow down thereto and from there to the nozzle member. When the plunger is retracted, the plunger wall 330
A seal at contacts an eyelet (not shown) in the rear end of the plunger to close flow to the reservoir.

Advantages of the Invention A spray device according to the invention can eliminate worn valves by simply unscrewing the body 118 and withdrawing the stem 110 forwardly with sufficient force to overcome the resistance due to the friction fit of the stem portion within the plunger 104. It will be appreciated that the shaft can be replaced. A new stem can then be inserted by pressing into the plunger. Therefore, disassembly of the valve device is not required.

Furthermore, by providing a press-fit, friction-fit valve seat 50 at the rear end of the nozzle member, a prior art nozzle section can be converted into a nozzle section suitable for use with the present invention. This type of arrangement allows the liquid flow to terminate directly at the rear of the nozzle section. The short spacing between the valve and the atomizing slit 54 prevents pressure surges and leaks from occurring and avoids the need to divert unused pressurized fluid to a reservoir when the valve is closed. Thus, there is no need to dispose of large amounts of unused liquid.

Referring now to FIG. 14, signal 402 comprises a system of rectangular pulses P that can be used to control the operation of the spray nozzle solenoid. In summary, when signal 402 is in the rHIGHJ or rONJ state, current is provided to activate the spray nozzle solenoid.

Solenoid and spray nozzle have signal 402 rLOWJ
Or it is activated when in the rOFFJ state. The usage cycle of the pulse sequence is determined by the width of the pulse P relative to the cycle time. In other words, the usage cycle D is the ON time. M and cycle time t. , can be determined by taking the ratio. Of course, the cycle time t,. 7 is the ON time. N and OFF time time OFF
It is the sum of F. Therefore, the usage cycle D is D= toN/ trot = toN/ (tox
+ topp).

To adjust the amount of spray output from the sprayer, the usage cycle of the signal 402 may be changed. Higher usage cycles increase the amount of spray output from the heater. For example, for one usage cycle, signal 402 always remains in the ON position, thus
This means that the spray nozzle likewise remains always ON.

For zero usage cycles, the spray nozzle remains OFF. In the case of the specific signal 402 shown in FIG. 14, the pulse width is t. , is approximately 17 of the total cycle time t TOT
It is 3. Therefore, the usage cycle of signal 402 shown in FIG. 14 is approximately 0.33, and the spray nozzle controlled by this signal is ON approximately 33.3% of the time.

The usage cycle is the pulse width t between adjacent pulses of the pulse sequence defined by signal 402. M or time t. It can be changed by changing one or both of the FFs. However, in typical atomizers, system limitations often prevent proper operation of the atomizer beyond characteristic operating parameters. For example, in systems that vary the pulse width to vary the cycle of use, valve and nozzle limitations prevent proper operation for pulse widths below a predetermined value. Thus, systems that vary 08 hours often have the disadvantage of poor spray patterns during periods of low spray output. Similarly, O
Systems that vary the use cycle by adjusting the FF time experience problems associated with roller drying when relatively long periods of time elapse between spray pulses (particularly during high speed press operations). However, the present invention overcomes these difficulties.

Referring to the temperature supply curve of FIG. 15, the amount of dampening liquid ejected by the atomizer preferably has a non-linear relationship to the press speed. Predetermined speed S. At press speeds below, the atomizer output is suppressed. This condition generally occurs when the press is ramped up to printing speed. Temperature supply curve 40
4, the speed S. and speed S1, the % warming (ie, the proportion of time the nozzle discharges dampening liquid) increases linearly with press speed at the first speed. Similarly, press speed S! and 82, between press speeds S2 and 33 and above speed S3, the heating % varies linearly with press speed at different speeds. If desired, the heating curve starts with the printing press at speed S. It is also possible to include a purge signal that indicates the amount of output when The rate at which the heating curve 404 changes slope and the slope of the characteristics for individual portions of the heating curve depend on the printing press using the atomizing system.

According to one feature of the invention, when the press speed is less than speed 32, the pulse width t of the nozzle control pulse P. N is set to a predetermined value (eg, 20 μsec), which is long enough to ensure a proper spray pattern. The % warming can then be varied by adjusting the time between adjacent pulses of the pulse sequence. If the press speed is greater than speed S2, the time between adjacent pulses is a predetermined value (for example, 40
0 .mu.sec), which ensures that the printing press rollers do not dry out excessively during the spray/respray period during high speed press operations. Next, the temperature supply percentage is changed by adjusting the pulse width of the pulse P. In this way, the present invention allows for proper spray patterns and effective operation over a wide range of operating conditions.

In other embodiments of the invention, the speed S. The pulse width between SI and speed S1 can be set to a first value (for example, 20 μs), and the pulse width between SI and 82 when the heating demand is high is, for example, 30 μs. can be set to a higher second value such as Similarly, speeds S2 and 83
The time between adjacent pulses of the pulse sequence for the press speed between can be set to one value (eg, 500 μsec) and the speed S.

For higher press speeds, other values can be set, such as 400 μsec. Thus, finer spray control is obtained by adding set points along the heating curve 404.

Of course, more set points can be provided in the heating curve to provide finer spray control if desired.

Referring now to FIG. 16, the control system according to the present invention includes a main controller 406, which is a central processing unit (C
PU) 408 , a system memory 410 , and a human power/output (Ilo) device 412 .

Furthermore, a display device (not shown), such as a liquid crystal display (not shown), a light emitting diode (LED) display, or a cathode ray tube (CRT), is provided to convey information regarding operating parameters etc. to the user. You can also do that. System memory 410 preferably includes a non-volatile storage portion to store one or more heating curves.

The heating curve can be pre-programmed into the system memory 410 or, preferably, the heating curve can be downloaded from a computer or from a terminal device.

For this purpose, a series of communication lines 414 may be provided to communicate the main controller 406 with the computer. Additionally, terminal device 416 can communicate with master controller 406 via communication line 418 .

Thus, the characteristics of the heating curve, which generally varies from press to press, can be tailored to the particular application using the atomizer.

In operation, once the heating curve information is stored in the computer, this information can be downloaded to the main controller 406 via a suitable series of interfaces, such as a standard R3422 interface. In order to store this information in the system memory 410, the CPU U2O
5 can be supplied. Preferably, system memory 410 comprises a programmable read-only memory device (FROM) for this purpose. Alternatively, the information on the heating curve can be supplied from the terminal device 416 to the CPU2O5. Thus, the user can store the appropriate heating curve directly in system memory 410 if desired.

CP 0408 sends the press speed display signal to the human power line 4.
Suitable for receiving at 20. The press speed indication signal can be obtained from a standard tachometer generator, Hall effect proximity sensor, or other suitable sensor. Furthermore, in modern printing presses equipped with printing computers,
The press speed display means can already be done manually using the press computer. In this case, the press speed display signal can be obtained directly from the printing computer.

In response to the speed indication signal, CPU 3O8 retrieves a record from system memory 410 containing information regarding the parameters of the spray nozzle actuation control signal.

For example, a speed indication signal can be converted to a memory address value. At this address, the system memory 41
The contents stored in 0 can then provide information indicative of the usage cycle value for the spray nozzle activation control signal. The parameters of the spray nozzle actuation signal are determined by the CPU 4 based on the stored usage cycle value and speed display signal.
It can be calculated using 08.

For example, referring again to FIG. 15, when a speed indication signal indicating speed S4 is obtained by main controller 406, the record stored in system memory 410 at the appropriate memory location is 15% humidity/temperature. It has a corresponding usage cycle value of 0.15. Since the speed S4 is slower than the speed S2, the pulse width t. N is set to a constant value such as 20 μsec, for example. As mentioned above, the usage cycle D can be expressed as D" taN/ (toN+topp). Solving t OFF, torp = to
We get M” (1-D)/D. Therefore, topp =20°(1-0,15) 10.15=1
It is 13 microseconds. If a particular press speed value requires 6% heat up, t OFF would be 313 μsec.

The parameters of the pulse sequence can similarly be calculated if the press speed value obtained by the main controller 406 is lower than the speed S2. For example, for press speed S5, the appropriate memory location in system memory 410 contains a record containing a usage cycle value of 0.22. t using a constant time of 400 μs between pulses.
The pulse width value t.N can be determined by solving so=tapp" (D/LD). Thus, t.N for the speed S5 is t, , = 400" (0,22/(1- 0,22))=
This would be 113 microseconds.

If the press speed value corresponds to a speed S2, i.e. if the pulse sequence corresponds to a speed value varying from a constant pulse width to a constant time between adjacent pulses, the main controller 406 sets the pulse width tON or , time t OFF can be calculated. Returning again to FIG. 16, after CPU 408 determines the parameters of the spray nozzle actuation pulse sequence, it controls I10 device 412 to output the pulse sequence to the spray bar.

In a preferred method of forming pulse sequences from pulse parameters, CPU 408 uses counts that correspond to pulse widths and times between pulses. The pulse width count value is C8M, and the count value corresponding to the time between pulses is C6.
4, CPU 40g generates a rectangular pulse sequence by providing a HIGH output signal every C8N clock cycles and a LOW output signal every C01 clock cycles. Count values C8° and C01, themselves, are stored in system memory 410 and can be retrieved by CP 0408 in response to the press speed indication signal.

Preferably, CPO 408 generates a sequence of pulses, one to six of which are sent by I10 device 412 to first to sixth output lines 422.424.426.428.4, respectively.
30 and 432. Output lines 422 and 424 are connected to each channel of a standard dual channel optocoupler 434.

Similarly, output lines 426 and 428 are connected to each channel of dual channel optocoupler 436, and output lines 430 and 432 are connected to each channel of dual channel optocoupler 438. These optocouplers act to isolate the main controller 406 from damage that may be caused by temporal surges and the like.

After the output line 422 passes through the optocoupler 434,
Controls the operation of power transistor TRI. Similarly,
Output line 424 controls power transistor TR2, output line 426 controls operation of power transistor TR3, and output line 428 controls power transistor T
Output line 430 controls the operation of power transistor TR5, and output line 432 controls the operation of power transistor TR6.

Thus, the pulse sequences appearing on output lines 422-432 are generated by power transistors TRI-TR, respectively.
6. Determine the operating state of step 6. Then, the transistor TRI
The operating states of TR6 are controlled by control channels 1 to 6, respectively.
Determine the signal that appears in .

Referring to FIG. 17, the spray bar 440 can be provided with eight spray nozzles N1 to N8 arranged in a linear row. The spray bar 440 is preferably suitable for supplying dampening fluid to a multi-page printing press. Typically,
For example, spray bar 440 supplies dampening fluid to a four page printing press.

In this case, nozzles N1 and N2 mainly control the temperature supply of page 1, nozzles N3 and N4 mainly control the temperature supply of page 2, nozzles N5 and N6 mainly control the temperature supply of page 3, and nozzles N7 and N8 mainly control page 4 temperature supply. Of course, the spray patterns from adjacent nozzles overlap slightly.

Since the terminal nozzles N1 and N8 are located at the outermost part of the linear row of nozzles, no heating occurs due to overlapping spray from adjacent outer nozzles. That is, the portions of the warming roll adjacent to the exterior of pages 1 and 4 receive slightly less dampening liquid than the remaining roller portions. However, the exterior of the roller often tends to heat up more than the middle portion of the roller. Therefore, the portions of the roller that require large amounts of dampening fluid often accommodate the least strain. It has been suggested that this problem may be overcome by using larger spray nozzles on the outer part of the spray bar. However, this solution is
Other problems often arise with the use of different spray nozzles for spray bars. Furthermore, maintenance and manufacturing of the spray bar is complicated by this construction.

According to one feature of the invention, this drawback in conventional fogging systems is overcome. As shown in Figure 17,
Nozzle N1 is controlled by channel 1 and nozzle N1
Nozzles N3 and N4 are controlled by channel 2, nozzles N5 and N6 are controlled by channel 4, nozzle N7 is controlled by channel 5, and nozzle N8 is controlled by channel 6. Ru. To compensate for the increase in heat and decrease in temperature supply in the outer spray nozzles, the usage cycles of the pulse sequences in control channels 1 and 6 can be increased. For example, control channel 1
The usage cycle of the pulse sequence in can be slightly higher than the usage cycle of the pulse sequence in control channel 2.

Similarly, the cycle of use of the pulse sequence in control channel 8 may be slightly higher than the cycle of use of the pulse sequence in control channel 7.

Preferably, the cycles of use of the pulse sequences in control channels 1 and 8 are functionally correlated to the cycles of use of the pulse sequences in control channels 2 and 7, respectively. In one embodiment, the usage cycles of the pulse sequences in control channels 1 and 8 are 4% higher than the usage cycles of the pulse sequences in control channels 2 and 7, respectively. In other words, nozzle N1
The usage cycle of is 1.04 of the usage cycle of nozzle N2.
It will be doubled.

Since nozzles N1 and N8 each have a dedicated control channel, different usage cycles can be accommodated.

CPU U2O5 can be programmed to calculate modified usage cycles for nozzles N1 and N8 and adjust the pulse sequences for output lines 422 and 432 accordingly. Dedicated power transistors TRI and TR8 control nozzles N1 and N8 according to a modified pulse sequence.

Typically, in multi-page printing operations, printing parameters change from page to page. These changes in printing parameters can result in a page requiring additional (or less) dampening fluid. Therefore, a separate control channel is provided for each page.

As shown in FIG. 17, nozzles N3 and N4 (page 2
) is operated by channel 3.

Nozzles N5 and N6 (page 3) are controlled by channel 4. Of course, since outer nozzles N1 and N8 have dedicated control channels, nozzles N2 and N7 also have individual control channels CH2 and C84, respectively. Again, however, the cycle of use of the pulse sequence in channel 1 is preferably functionally correlated to the cycle of use of the pulse sequence in channel 2, and the cycle of use of the pulse sequence in channel 8 is preferably correlated to the cycle of use of the pulse sequence in channel 2. It will be appreciated that there is a functional correlation to the usage cycle of the pulse sequence in 7.

In order to have greater flexibility in controlling the operation of the spray device, the operating characteristics of the main control device can be varied according to the user's indications. Therefore, user commands can be input to the main controller 406 via the terminal device 416. Additionally, the main controller 406 may include a keypad or special control knob (not shown).

For example, if page 2 requires an increase in heating, the user can
U2O5 may be instructed to increase the usage cycles of the channel 3 pulse sequence.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

1 is a perspective view of a spraying mechanism according to the invention, including the part of the printing mechanism shown in dash-dotted lines; FIG. 2 is a side view of a spraying device according to the invention; FIG.
Figure 4 is a rear end view of the sprayer with the solenoid casing shown in dashed lines; Figure 5 is a front end view of the sprayer; Figure 6 is the sprayer shown in the figure. Figure 7 is a partially cut-away view of the nozzle section sealingly engaging the valve stem; Figure 8 shows the nozzle section being closed by the valve stem; FIG. 9 is a partial longitudinal sectional view of the valve section of the spray device showing the valve stem removed from the plunger; FIG. 11 is a side view of the spray device according to the prior art; FIG. 12 is a partially longitudinal exploded explanatory diagram of the spray device of the prior art; FIG. 13 14 is a partial longitudinal sectional illustration of a nozzle section according to the prior art; FIG. 14 is a waveform illustration of a rectangular pulse sequence used to operate the spray nozzle solenoid; FIG. 15 is a correlation of press speed to spray nozzle operating parameters. FIG. 16 is a block diagram of an embodiment of the atomizer control sequence according to the invention; FIG. It is an explanatory diagram showing a relationship. 38... Nozzle, 40... Valve, 50... Valve seat, 5
4...Slit, 70...Valve housing, 71...
・Boat, 72...Through hole, 104...Plunger, 110...Valve stem and -mil

Claims (22)

[Claims] (1) A valve (40), a nozzle (38) having a liquid spray outlet (54) at its tip and a valve seat (50) at its rear end, and the nozzle being detachably attached to the valve. a valve housing (70) having a through hole (72) communicating with a liquid inlet (71);
a solenoid plunger (104) that is slidably installed in the through hole and capable of reciprocating therein; and a solenoid plunger (104) that is removably installed at the tip of the plunger and arranged to contact the valve seat. In a liquid spraying device comprising a valve stem provided with a front sealing surface (122), the valve seat, the valve stem, the plunger and the nozzle means are coaxially disposed, the valve stem is attached to the valve stem. It is removable from the plunger by applying an appropriate force to the tip, and the through hole is sufficient to remove the valve stem from the plunger in a forward direction when the nozzle means is removed from the valve means. 1. A liquid spraying device characterized by having a wide width. (2) The liquid spray device according to claim 1, wherein the valve stem is attached to the plunger by friction fit. 3. Device according to claim 1, characterized in that the valve stem is provided at its outer periphery with at least one longitudinal channel (132) for guiding the liquid. (4) In the apparatus according to claim 1, the nozzle means comprises a nozzle housing (42), and includes a slitted member (46) inserted into the nozzle housing to provide a spray outlet (54) at the tip of the nozzle housing. A liquid spraying device characterized in that the valve seat (50) is press-fitted into the rear end of the nozzle housing and projects rearward therefrom. (5) The liquid spray device according to claim 4, wherein the valve seat (50) is inclined rearward. (6) In the device according to claim 4, the front surface (12
A liquid spraying device characterized in that 2) is made of an elastic material. (7) The liquid spraying device according to claim 1, characterized in that the spraying device comprises an atomizer attached to the printing device (10) and sprays the liquid onto the rotating roll (16) of the printing device. Device. (8) The apparatus of claim 7, wherein the spray device comprises a plurality of nozzles spaced apart along the length of the rotating roll;
A liquid spraying device characterized by directing overlapping sprays in the direction of the roll. (9) A plurality of spray nozzles (N1 to N8) for supplying spray liquid to the roller (16) of the printing press (10)
and a speed signal (4) indicating the printing speed of the printing press.
14, 420); means (406) for generating a first rectangular pulse sequence (402); and means (406) for generating a first rectangular pulse sequence (434, TR1, TR3;
436, TR3, TR4; 438, TR5, TR6); and means for driving said nozzle in response to said speed signal being lower than a first speed value. Each rectangular pulse (P) in the first pulse sequence (402) has a constant duration (t_o_n) and has an adjacent pulse (
the time between adjacent pulses (t_o_f_f) in the first pulse sequence (402) when the value of the speed signal is higher than the first speed value; Control system, characterized in that the time is constant and the duration of the pulse (t_o_n) varies depending on the speed signal. (10) The system of claim 9, wherein the first rectangular pulse sequence comprises a first constant duration rectangular pulse when the numerical value of the speed signal is lower than the first speed value; a second constant duration pulse at a lower second velocity value. (11) The system according to claim 9 or 10,
The atomizing system comprises at least four atomizing nozzles arranged in a linear row and forming an overlapping spray pattern, and the drive means each include a separate drive for the outermost nozzle at each end of said linear row. A control system characterized in that it comprises a flow path and at least one drive flow path for a pair of nozzles in the middle of said linear row. (12) The system according to claim 11, wherein the pulse sequence generating means further generates a second rectangular pulse sequence to drive each of the outermost nozzles in the linear row, and the second rectangular pulse sequence is the outermost nozzle. A control system characterized in that the nozzles are associated with the first rectangular pulse sequence such that the nozzles have a higher usage cycle than the nozzles in the middle of the linear array. (13) In the system according to any one of claims 9 to 12, the first rectangular pulse sequence has a fixed time period between adjacent pulses of the rectangular pulse sequence when the numerical value of the speed signal is higher than the first speed value; a second fixed time period between adjacent pulses when the numerical value of the speed signal is higher than a third higher speed value. (14) When controlling the operation of the atomizing system comprising a plurality of electromagnetically actuated atomizing nozzles (N1 to N8) for supplying atomizing liquid to the roller (16) of the printing press (10), the printing press Obtain a signal indicating the speed, and
A control method comprising generating a rectangular pulse sequence (402) and driving a solenoid in response to said first rectangular pulse sequence, said first rectangular pulse when the speed of a printing press is less than a first speed value. Each rectangular pulse (P) in the sequence has a constant duration (t_
o_n) and the time of adjacent pulses (t_o_f_f) varies as a function of the speed signal, and further when the speed of the printing press is higher than the first speed value.
Adjacent pulses (t_o_f
The time between __f) is constant and the pulse (t_o_n)
The control method is characterized in that the duration of the change varies as a function of the speed signal. (15) In the method according to claim 14, the generating step includes:
generating a rectangular pulse sequence having a first constant duration when the speed of the printing press is less than a first speed value; and a second rectangular pulse sequence when the speed of the printing press is less than a lower second speed value. A control method characterized by generating a pulse of constant duration. 16. The method of claim 14 or 15, wherein the step of generating forms a first fixed time period between adjacent pulses of the rectangular pulse sequence when the speed of the printing press is higher than the first speed value; A control method characterized in that a second fixed time period is formed between adjacent pulses when the press speed is higher than a third higher speed value. (17) A method according to any of claims 14 to 16, wherein the generating step comprises forming a first fixed time period between adjacent pulses of the rectangular pulse sequence when the speed of the printing press is higher than the first speed value. and forming a second constant time between adjacent pulses when the press speed is higher than a second higher speed value. (18) A method according to any one of claims 14 to 17, wherein the atomizing system comprises at least four atomizing nozzles arranged in linear rows and forming overlapping spray patterns, and further comprising: the additional step of generating a second rectangular pulse sequence for driving the outermost nozzle at the end, said second rectangular pulse sequence being coordinated with said first rectangular pulse sequence and said first rectangular pulse sequence
Higher usage cycle (t_o
_n/t_t_o_t), and the outermost nozzle is driven in response to the second rectangular pulse sequence. (19) means for sensing the velocity of the moving surface and forming a signal related to the sensed velocity (414, 420) and arranged to form a superimposed spray pattern on the moving surface (16); at least one spray bar comprising a linear array of spray nozzles (N1 to N8) and a cycle of use (t_o_n) operatively coupled to said sensing means and associated with the value of said signal formed by said speed sensing means;
/t_t_o_t); means (406) for generating a first rectangular pulse sequence (402) having a first rectangular pulse sequence (434, TR1, TR3; 436,
a moving surface (16) comprising means for driving said nozzle in accordance with TR3, TR4; 438, TR5, TR6);
In the atomizing system for supplying atomizing liquid to a computer, each rectangular pulse P in the first pulse sequence (402) has a constant duration (t_o_n) when the detected velocity is lower than a first velocity value. and the adjacent pulse (t
the time between adjacent pulses (t_o_f_f) in the first pulse sequence (P) when the sensed speed is higher than the first speed value; A misting system, characterized in that the time of the pulse (t_o_n) is constant and the duration of the pulse (t_o_n) varies depending on the detected speed signal. (20) The system according to claim 19, wherein the generating means comprises a central processing unit (408), the central processing unit searches the record stored in the storage device (410) based on the detected speed signal, and The recording includes information for controlling at least one of the pulse width (t_o_n) and the time between adjacent pulses (t_o_f_f) of the first rectangular pulse sequence (402), the central processing unit (408)
by operating in response to said retrieved records;
A misting system characterized in that it generates the first rectangular pulse sequence (402). (21) The system according to claim 20, wherein the record is a usage cycle value (t_o_n/t_t_o_t),
Further, when the detected speed is lower than the first speed value, the first speed value is
Adjacent pulses (t_o
_f_f) is determined from the usage cycle value and a constant duration (t_o_n), and the pulse (t_o_n) in the first rectangular pulse sequence (402) when the sensed speed is higher than a first speed value ) of the used cycle value and the adjacent pulse (t_
o_f_f). (22) The system according to any one of claims 19 to 21, wherein the at least one spray bar comprises at least four spray bars.
The outermost nozzle (N1) at one end of the linear array is connected to a first dedicated power transistor (TR1).
The outermost nozzle (N8) at the other end of the linear array is operated by a second dedicated power transistor (TR
6) further generating a second rectangular pulse sequence associated with said first rectangular pulse sequence and having a higher usage cycle (t_o_n/t_t_o_t) than said first rectangular pulse sequence; means for generating a third rectangular pulse sequence associated with the pulse sequence and having a higher usage cycle than the first rectangular pulse sequence;
The rectangular pulse sequence activates the first dedicated power transistor (TR1) and the third rectangular pulse sequence activates the second dedicated power transistor (TR6).
).