JP2019157799A - Doctor chamber coater and tube pump - Google Patents

Abstract

To provide a doctor chamber coater and a tube pump that can reduce a possibility in which component of coating liquid is disturbed due to presence of cleaning fluid within the pump.SOLUTION: A first pump 24 has a rotor 241 and a movable housing 243 having U-shaped side surface 243a and arranged at a side part of the rotor 241. A supply passage 21 has: an introduction part 210 fed into the first pump 24; a derivation part 211 derived from the first pump 24; and a bent-back part 212 arranged between the introduction part 210 and the derivation part 211 and installed along the U-shaped side surface 243a to pass between an outer edge path of the rotor 241 and the U-shaped side surface 243a. A control device moves away the movable housing 243 from the rotor 241 after supplying cleaning liquid to a major flow path and releases a constriction of the bent-back part 212 between the rotor 241 and the U-shaped side surface 243a.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a doctor chamber coater for applying a coating liquid to an object to be coated and a tube pump thereof.

  As this kind of doctor chamber coater used conventionally, the structure shown by the following patent document 1 etc. can be mentioned, for example. That is, in the conventional configuration, the ink (coating liquid) sucked up from the ink tank by the negative pressure of the ink pump is supplied to the internal space of the doctor chamber through the ink supply path, and is arranged so as to face the internal space of the doctor chamber. The ink adhered to the peripheral surface of the roll body is applied to the object to be coated. When replacing the roll body, the cleaning liquid sucked up from the cleaning liquid tank by the negative pressure of the ink pump is supplied to the internal space of the doctor chamber through the cleaning liquid supply path to clean the internal space of the doctor chamber and the roll body. The cleaning liquid supplied to the internal space of the doctor chamber is discharged to the storage tank.

JP-A-8-58069

  In the conventional configuration as described above, the ink (coating liquid) and the cleaning liquid are sucked up by the negative pressure of the ink pump. For this reason, there is a possibility that the coating liquid is sucked up with the cleaning liquid remaining in the ink pump and the components of the coating liquid are disturbed.

  The present invention has been made in order to solve the above-described problems, and its purpose is to provide a doctor chamber coater that can reduce the risk of disturbance in the components of the coating liquid due to the cleaning liquid remaining in the pump. It is to provide a tube pump.

  The doctor chamber coater according to the present invention includes a supply path, a coating unit including a doctor chamber connected to the supply path, a main flow path having a discharge path connected to the doctor chamber, a tube pump provided in the supply path, The tube pump has a rotating body and a U-shaped side surface, and has a movable housing disposed on the side of the rotating body, and the supply path is an introduction portion that is introduced into the tube pump. A lead-out portion led out from the tube pump, and provided between the lead-in portion and the lead-out portion, and arranged along the U-shaped side surface so as to pass between the outer edge track of the rotating body and the U-shaped side surface. The operation mode of the control device includes a cleaning mode in which the existing coating liquid is discharged from the main flow path and the cleaning liquid is supplied to the main flow path. To cleaning liquid After supplying, away the movable housing from the rotation body, to release the constriction of the bent portion between the rotary member and the U-shaped side surface.

The tube pump according to the present invention has a rotating body, a U-shaped side surface, a movable housing disposed on the side of the rotating body, and a U-shaped passage between the outer edge track of the rotating body and the U-shaped side surface. It is provided with a tube having a folded portion disposed along the letter-shaped side surface, and is configured to release the narrowing of the folded portion between the rotating body and the U-shaped side surface by moving the movable housing away from the rotating body. Yes.

  According to the doctor chamber coater of the present invention, the control device, after supplying the cleaning liquid to the main flow path, moves the movable housing away from the rotating body and releases the narrowing of the folded portion between the rotating body and the U-shaped side surface. Therefore, it is possible to reduce a possibility that the components of the coating liquid are disturbed by the cleaning liquid remaining in the pump. Further, according to the tube pump of the present invention, the movable housing is kept away from the rotating body, and the narrowing of the folded portion between the rotating body and the U-shaped side surface can be released. The possibility that the components of the coating liquid may be disturbed by the remaining cleaning liquid can be reduced.

It is a block diagram which shows the whole structure of the doctor chamber coater by embodiment of this invention. It is a block diagram which shows the coating unit of FIG. It is a rear view which shows the doctor chamber of FIG. It is a side view which shows the cleaning nozzle in a chamber of FIG. It is a front view which shows the cleaning nozzle in a chamber of FIG. It is a side view which shows the roll washing nozzle of FIG. It is a front view which shows the roll washing nozzle of FIG. It is a front view which shows the 1st pump of FIG. It is explanatory drawing which shows the occluder of FIG. It is a perspective view which shows the side nozzle of FIG. It is explanatory drawing which shows the edge part cleaning apparatus of FIG. It is a flowchart which shows the operation mode determination operation | movement by the control apparatus of FIG. It is a flowchart which shows the operation control of the control apparatus in the coating mode of FIG. It is a flowchart which shows operation control of the control apparatus in the washing | cleaning mode of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment FIG. 1 is a block diagram showing an overall configuration of a doctor chamber coater according to an embodiment of the present invention.

  As shown in FIG. 1, the doctor chamber coater includes a coating liquid tank 1, a main flow path 2, a circulation cleaning liquid tank 3, a new liquid cleaning system 4, and a control device 5.

  The coating liquid tank 1 is a container in which the coating liquid 1a is stored. Examples of the coating liquid 1a include ink, paint, and chemical conversion liquid.

  The main flow path 2 is configured to allow the coating liquid 1a to pass therethrough in order to apply the coating liquid 1a in the coating liquid tank 1 to an object to be coated. Examples of the object to be coated include a belt-shaped member made of a material such as paper, plastic, or metal.

  The main flow path 2 includes a nozzle unit 20, a supply path 21, a discharge path 22, a coating unit 23, a first pump 24 and an occluder 25.

  The nozzle unit 20 is a unit in which the suction nozzle 20a and the discharge nozzle 20b are integrated. The suction nozzle 20 a is a nozzle for sucking up the coating liquid 1 a in the coating liquid tank 1, and is connected to the supply path 21. The discharge nozzle 20 b is a nozzle for returning the coating liquid 1 a to the coating liquid tank 1, and is connected to the discharge path 22. In the present embodiment, the suction nozzle 20a constitutes an end portion of the supply passage 21, the discharge nozzle 20b constitutes an end portion of the discharge passage 22, and the end portions of the supply passage 21 and the discharge passage 22 are integrated with each other. Displaceable. The tip of the suction nozzle 20a is positioned below the tip of the discharge nozzle 20b. When the tip of the suction nozzle 20a is immersed in the coating liquid 1a in the coating liquid tank 1, the tip of the discharge nozzle 20b It is comprised so that a front-end | tip can be located above a liquid level.

  The supply path 21 is a pipe for supplying the coating liquid 1 a sucked up from the suction nozzle 20 a to the coating unit 23. The discharge path 22 is a pipe for discharging the coating liquid 1 a exceeding a certain amount in the coating unit 23 from the coating unit 23. The coating liquid 1 a passed through the discharge path 22 and the discharge nozzle 20 b is returned to the coating liquid tank 1. That is, the coating liquid 1 a is circulated in the coating liquid tank 1, the supply path 21, the coating unit 23, and the discharge path 22.

  The coating unit 23 is a unit for applying the coating liquid 1a to an object to be coated. The first pump 24 is a pump that is provided in the supply passage 21 and generates a negative pressure for sucking up the coating liquid 1a from the suction nozzle 20a. The occluder 25 is a device that is provided in the discharge path 22 and closes the discharge path 22. The configurations of the coating unit 23, the first pump 24, and the occluder 25 will be described later with reference to the drawings.

  In the doctor chamber coater of the present embodiment, replacement of the coating liquid 1a is assumed, for example, replacement with a paint having a different color. When the coating liquid 1a is replaced, before the new coating liquid 1a is passed through the main flow path 2, the existing coating liquid 1a is discharged from the main flow path 2 and the main flow path 2 is cleaned. Is called. The circulation cleaning liquid tank 3, the end cleaning device 45, and the new liquid cleaning system 4 have a configuration related to cleaning of the main flow path 2.

  The circulation cleaning liquid tank 3 is a container that stores a circulation cleaning liquid 3 a that is circulated through the main flow path 2 for cleaning the main flow path 2. A thinner or the like can be used as the circulation cleaning liquid 3a. As will be described in detail later, when cleaning of the main flow path 2 is performed, the nozzle unit 20 is displaced to the position of the circulating cleaning liquid tank 3 by the control of the control device 5, and the circulating cleaning liquid tank 3 passes through the nozzle unit 20. Circulating cleaning liquid 3 a is circulated through the main flow path 2.

  The new liquid cleaning system 4 is for cleaning the main flow path 2 and the like using the new liquid 40a of the cleaning liquid. The new liquid cleaning system 4 includes a new liquid tank 40, a second pump 41, a flow path control mechanism 42, a cleaning nozzle group 43, a pair of side nozzles 44, and an end cleaning device 45.

  The new liquid tank 40 is a container in which a new liquid 40a as a cleaning liquid is stored. As the new cleaning liquid 40a, thinner or the like can be used as in the cleaning liquid 3a for circulation. The circulating cleaning liquid 3a is used or has been used a plurality of times for cleaning, but the new cleaning liquid 40a is unused. The new liquid 40 a of the cleaning liquid sent out from the new liquid tank 40 is not returned to the new liquid tank 40 but is discarded or sent to the cleaning liquid tank 3 for circulation.

  The second pump 41 generates a negative pressure for sending out a new liquid 40 a of the cleaning liquid from the new liquid tank 40. As the second pump 41, any pump such as a diaphragm pump can be used.

  The flow path control mechanism 42 is constituted by a plurality of valve bodies and the like, and is for controlling the flow path of the new cleaning liquid 40a. Under the control of the flow path control mechanism 42, a new cleaning liquid 40 a is supplied to any one of the cleaning nozzle group 43, the pair of side nozzles 44, and the end cleaning device 45.

  The cleaning nozzle group 43 includes a plurality of nozzles that inject a new cleaning liquid 40 a in the doctor chamber 230 of the coating unit 23. The cleaning nozzle group 43 will be described later with reference to the drawings.

  The side nozzle 44 is a nozzle that injects a new liquid 40 a of the cleaning liquid toward both sides of the roll body 231 (see FIG. 2 and the like) of the coating unit 23. The side nozzle 44 will also be described later with reference to the drawings.

  The end cleaning device 45 is a device that cleans the ends of the supply path 21 and the discharge path 22, that is, the suction nozzle 20a and the discharge nozzle 20b. As will be described in detail later, the suction nozzle 20a and the discharge nozzle 20b are cleaned by the end cleaning device 45 after the circulation cleaning liquid 3a is circulated under the control of the control device 5. The configuration of the edge cleaning device 45 will also be described later with reference to the drawings.

  The control device 5 controls the operation of each component of the doctor chamber coater. As the control device 5, for example, an arithmetic processing device that issues a control command in accordance with a program stored in a storage device can be used. Operation control of each component by the control device 5 will be described later with reference to the drawings.

Next, the coating unit 23 and the cleaning nozzle group 43 in FIG. 1 will be described with reference to FIGS.
FIG. 2 is a configuration diagram illustrating the coating unit 23 of FIG. 1, and is a cross-sectional view of the doctor chamber 230 taken along line AA of FIG. 3.
FIG. 3 is a rear view showing the doctor chamber 230 of FIG.
FIG. 4 is a side view showing the in-chamber cleaning nozzle 430 in FIG. 2 and shows a state in which the cleaning liquid is blown out from the in-chamber cleaning nozzle 430.
FIG. 5 is a front view showing the in-chamber cleaning nozzle 430 of FIG.
FIG. 6 is a side view showing the roll cleaning nozzle 431 in FIG. 2 and shows a state in which the cleaning liquid is blown out from the roll cleaning nozzle 431.
FIG. 7 is a front view showing the roll cleaning nozzle 431 of FIG.

  As particularly shown in FIG. 2, the coating unit 23 includes a doctor chamber 230 and a roll body 231.

  The doctor chamber 230 is a container body in which the coating liquid 1a is stored. An opening 230 a is formed in the front part of the doctor chamber 230. The roll body 231 is arranged so that the circumferential surface faces the inside of the doctor chamber 230 through the opening 230a. By rotating the roll body 231, the coating liquid 1 a in the doctor chamber 230 sequentially adheres to the peripheral surface of the roll body 231. The coating liquid 1a adhering to the peripheral surface of the roll body 231 is applied to the object to be coated. Another roll may be interposed between the roll body 231 and the object to be coated, or the coating liquid 1a may be applied directly from the roll body 231 to the object to be coated.

  The doctor chamber 230 includes a chamber body 232, an upstream doctor blade 233, and a downstream doctor blade 234.

  The chamber body 232 is a member having a substantially C-shaped cross section. The upstream doctor blade 233 is a longitudinal member disposed on the upstream side of the opening 230 a in the rotation direction of the roll body 231. Similarly, the downstream doctor blade 234 is a longitudinal member disposed on the downstream side of the opening 230 a in the rotation direction of the roll body 231. The opening 230 a of the doctor chamber 230 can be defined by a gap between the distal ends of the upstream doctor blade 233 and the downstream doctor blade 234.

  The distal ends of the upstream doctor blade 233 and the downstream doctor blade 234 are abutted against the circumferential surface of the roll body 231. Since the tips of the blades 233 and 234 are abutted against the peripheral surface of the roll body 231, the interior of the chamber body 232 is a space surrounded as a whole. Although not shown, a recess is formed on the peripheral surface of the roll body 231. The downstream doctor blade 234 scrapes off the coating liquid 1a attached to the peripheral surface of the roll body 231 so as to leave the coating liquid 1a in the recess. As a result, a certain amount of the coating liquid 1 a remains on the peripheral surface of the roll body 231.

  A supply path 21, a discharge path 22, and a cleaning nozzle group 43 are attached to the chamber body 232.

  As particularly shown in FIG. 3, the supply path 21 is disposed at the lower center portion in the width direction 232 w (the axial direction of the roll body 231) of the chamber body 232. The discharge path 22 is disposed on both upper sides in the width direction 232 w of the chamber body 232. The coating liquid 1 a is supplied from the supply path 21 into the doctor chamber 230, and the coating liquid 1 a accumulated in the doctor chamber 230 up to the height of the discharge path 22 is discharged from the discharge path 22. The flow of the coating liquid 1 a is the same as the flow of the circulation cleaning liquid 3 a inside the doctor chamber 230.

  As described above, the cleaning nozzle group 43 is for injecting the new cleaning liquid 40 a in the doctor chamber 230. The cleaning nozzle group 43 includes a plurality of in-chamber cleaning nozzles 430 and a plurality of roll cleaning nozzles 431.

  The in-chamber cleaning nozzle 430 will be described with reference to FIGS. 4 and 5 in addition to FIG. As shown in FIG. 3, the plurality of in-chamber cleaning nozzles 430 are attached to the upper portion of the doctor chamber 230 (chamber main body 232) at intervals in the width direction 232w of the doctor chamber 230. Each in-chamber cleaning nozzle 430 is provided so as to spray a cleaning liquid into the doctor chamber 230 from the upper part to the lower part of the doctor chamber 230. The inside of the doctor chamber 230 is cleaned by spraying a new cleaning liquid 40a from each chamber cleaning nozzle 430 into the doctor chamber 230.

  The cleaning liquid spray angle of each chamber cleaning nozzle 430 is 40 °, for example, and the cleaning liquid new liquid 40a from each chamber cleaning nozzle 430 does not overlap each other in the upper part of the doctor chamber 230, and each chamber cleaning nozzle 430 Are set to overlap each other in the lower part of the doctor chamber 230. The injection flow rate of the new cleaning liquid 40a from each chamber cleaning nozzle 430 is, for example, 0.2 L / min or more and 0.6 L / min or less per nozzle, and is necessary and sufficient for cleaning the inside of the doctor chamber 230. Set to quantity.

  Next, the roll cleaning nozzle 431 will be described with reference to FIGS. 6 and 7 in addition to FIG. As shown in FIG. 3, the plurality of roll cleaning nozzles 431 are attached to the upper portion of the doctor chamber 230 (chamber body 232) with a space therebetween in the width direction 232 w of the doctor chamber 230. Each roll cleaning nozzle 431 is provided so as to inject a new cleaning liquid 40 a to the roll body 231 from the upper part of the doctor chamber 230 obliquely downward. The peripheral surface of the roll body 231 is cleaned by injecting a new cleaning liquid 40 a from each roll cleaning nozzle 431 onto the roll body 231.

  The cleaning liquid spray angle of each roll cleaning nozzle 431 is, for example, 80 °, and the new liquid 40a of the cleaning liquid from each roll cleaning nozzle 431 does not overlap with each other in the vicinity of the roll cleaning nozzle 431, and from each roll cleaning nozzle 431 The new liquid 40 a of the cleaning liquid is set to overlap each other on the peripheral surface of the roll body 231. The injection flow rate of the new cleaning liquid 40a from each roll cleaning nozzle 431 is necessary and sufficient for cleaning the peripheral surface of the roll body 231 such as 0.2 L / min or more and 0.6 L / min or less per nozzle. Set to quantity.

  As particularly shown in FIG. 3, the in-chamber cleaning nozzle 430 and the roll cleaning nozzle 431 are attached to the upper portion of the doctor chamber 230 and are shifted from each other in the width direction 232 w of the doctor chamber 230. Accordingly, even if the cleaning liquid new liquid 40a is simultaneously ejected from the in-chamber cleaning nozzle 430 and the roll cleaning nozzle 431, the cleaning liquid new liquid 40a from the in-chamber cleaning nozzle 430 and the roll cleaning nozzle 431 interferes with each other. It can be avoided.

  Next, the first pump 24 will be described with reference to FIG. FIG. 8 is a front view showing the first pump 24 of FIG. 8A shows a state where the movable housing 243 is brought close to the rotating body 241, and FIG. 8B shows a state where the movable housing 243 is moved away from the rotating body 241.

  As shown to (a) of FIG. 8, the 1st pump 24 is comprised by the tube pump, and has the pump main body 240, the rotary body 241, the actuator 242, and the movable housing 243. As shown in FIG.

  The pump body 240 is fixed to a support member (not shown). The pump body 240 incorporates a drive device such as a motor having a rotating shaft 240a.

  The rotating body 241 includes a support member 241a and a pair of rollers 241b. The support member 241a is a member that extends in the radial direction of the rotating shaft 240a, and is fixed to the rotating shaft 240a. The support member 241a is rotated together with the rotating shaft 240a by the driving force of the driving device. The roller 241b is rotatably supported at both ends of the support member 241a.

  The actuator 242 is composed of, for example, a solenoid actuator. The actuator 242 has a fixed part 242a and a movable part 242b. The fixing portion 242a is fixed to the pump body 240. The movable part 242b is provided so as to be able to advance and retreat in a direction away from the fixed part 242a and a direction approaching the fixed part 242a.

  The movable housing 243 is a member having a U-shaped side surface 243 a and is disposed on the side of the rotating body 241. The movable housing 243 is provided with a long hole 243b extending in the advancing / retreating direction of the movable portion 242b of the actuator 242. A pin 240b fixed to the pump body 240 is disposed inside the long hole 243b. As shown in FIGS. 8A and 8B, the movable housing 243 is supported by a pin 240b so as to be displaceable by a predetermined width 243w in the advancing / retreating direction of the movable portion 242b.

  The supply path 21 (pipe) includes an introduction part 210 introduced into the first pump 24, a lead-out part 211 led out from the first pump 24, and a folding part provided between the lead-in part 210 and the lead-out part 211. 212.

  The folded portion 212 is disposed along the U-shaped side surface 243 a so as to pass between the outer edge track of the roller 241 b of the rotating body 241 and the U-shaped side surface 243 a of the movable housing 243. When the movable housing 243 is brought close to the rotating body 241 as shown in FIG. 8A, the roller 241b narrows the folded portion 212 between the roller 241b and the U-shaped side surface 243a. By the rotation of the rotating body 241, the constricted portion of the folded portion 212 is moved, so that a negative pressure for sucking the coating liquid 1a from the suction nozzle 20a is generated. Further, by rotating the rotating body 241 in the reverse direction, the coating liquid 1 a can be caused to flow backward and the coating liquid 1 a can be discharged from the doctor chamber 230.

  As shown in FIG. 8B, when the movable housing 243 is moved away from the rotating body 241, the folded portion 212 between the roller 241b and the U-shaped side surface 243a is opened. By opening the folding part 212, it is avoided that the cleaning liquid or the like remains in the narrowed part of the folding part 212.

  The introduction part 210 of the supply path 21 is provided to be inclined with respect to the horizontal so as to be lowered as the distance from the first pump 24 increases. Further, the lead-out portion 211 of the supply path 21 is provided so as to be inclined with respect to the horizontal so as to rise as the distance from the first pump 24 increases. Thus, since the introducing | transducing part 210 and the derivation | leading-out part 211 are inclined with respect to the horizontal, when the folding | turning part 212 is open | released as shown in (b) of FIG. It is made to fall out of the first pump 24.

  Next, the occluder 25 will be described with reference to FIG. FIG. 9 is an explanatory view showing the occluder 25 of FIG. 9A shows the non-occlusion state of the occluder 25, and FIG. 9B shows the occlusion state of the occluder 25.

  As shown in FIG. 9A, the occluder 25 has an occluder body 250 and a pair of occlusion bodies 251. The occluder body 250 is fixed to a support member (not shown). The pair of occlusion bodies 251 are arranged in the occluder body 250 so that the discharge path 22 is positioned between the pair of occlusion bodies 251. As shown in FIG. 9B, the pair of closing bodies 251 are configured to be displaced in a direction approaching each other by a driving force of an actuator (not shown) so as to close the discharge path 22. The closing body 251 is disposed on the downstream side of the bent portion 220 of the discharge path 22.

  As shown in FIG. 9A, when the discharge path 22 has the bent portion 220, even if the cleaning liquid 3a for circulation or the new liquid 40a of the cleaning liquid is passed through the discharge path 22, the upper portion of the inner wall of the bent portion 220 is coated. There is a possibility that the working fluid 1a remains. As shown in FIG. 9B, the closing body 251 closes the discharge passage 22 on the downstream side of the bent portion 220 of the discharge path 22, so that the circulating cleaning liquid 3 a or a new cleaning liquid is also provided above the bent portion 220. The possibility that the coating liquid 1a remains on the upper part of the inner wall of the bent portion 220 is reduced when 40a is satisfied. In FIG. 9, both of the pair of closing bodies 251 are shown to be displaced toward each other. However, only one of the pair of closing bodies 251 is displaced toward the other, so that the pair of closing bodies 251 They may be brought close to each other.

  Next, the side nozzle 44 will be described. FIG. 10 is a perspective view showing the side nozzle 44 of FIG. The side nozzles 44 are nozzles that inject a new cleaning liquid 40 a toward both sides of the roll body 231 of the coating unit 23. A circumferential surface side end 231a and a shaft end surface 231b may be included on both sides of the roll body 231 to which the new cleaning liquid 40a is injected. As described above, even when the circulation cleaning liquid 3 a is circulated in the main flow path 2, the coating liquid 1 a may remain on both sides of the roll body 231. By spraying the new liquid 40a of the cleaning liquid from the side nozzle 44 to both sides of the roll body 231, the possibility that the coating liquid 1a remains on both sides of the roll body 231 can be reduced.

  Next, the edge cleaning device 45 will be described. FIG. 11 is an explanatory view showing the edge cleaning device 45 of FIG. As shown in FIG. 11, the end cleaning device 45 includes a housing 450 and a plurality of injection nozzles 451. The casing 450 receives the suction nozzle 20a and the discharge nozzle 20b to be cleaned. The plurality of injection nozzles 451 are arranged inside the casing 450 so as to be positioned on the outer periphery of the suction nozzle 20 a and the discharge nozzle 20 b that have entered the casing 450. The suction nozzle 20a and the discharge nozzle 20b are cleaned by the new liquid 40a of the cleaning liquid being sprayed from the spray nozzles 451 toward the outer surfaces of the suction nozzle 20a and the discharge nozzle 20b that have entered the housing 450. Is called. At this time, the entire suction nozzle 20a and discharge nozzle 20b can be cleaned by moving the injection nozzle 451 or the suction nozzle 20a and the discharge nozzle 20b up and down. The new cleaning liquid 40 a sprayed from each spray nozzle 451 and dropped into the housing 450 is discarded or sent to the cleaning liquid tank 3 for circulation.

  Next, the control operation of the control device 5 will be described. FIG. 12 is a flowchart showing the operation mode determination operation by the control device 5 of FIG. As shown in FIG. 12, when the power of the control device 5 is turned on, the control device 5 determines whether or not an external cleaning command is input (step S1). If the cleaning command is not input, the control device 5 sets the operation mode to the coating mode (step S2), and if the cleaning command is input, sets the operation mode to the cleaning mode (step S3). The cleaning command can be input to the control device 5 from an operation switch operated by an operator or a host system. This operation mode determination operation is repeated when the control device 5 is powered on.

  Next, FIG. 13 is a flowchart showing operation control of the control device 5 in the coating mode of FIG. As shown in FIG. 13, when the control device 5 starts the operation control in the coating mode, the nozzle unit 20 is displaced to the position of the coating liquid tank 1 (step S20), and the tip of the suction nozzle 20a is coated. The nozzle unit 20 is lowered so as to be immersed in the coating liquid 1a in the liquid tank 1 (step S21). Next, the control device 5 drives the first pump 24 (step S22), circulates the coating liquid 1a in the main flow path 2 and the coating liquid tank 1, and rotationally drives the roll body 231 ( Step S23), the coating liquid 1a is applied to the object to be coated via the roll body 231. The first pump 24 is driven at the first speed (high speed) until a predetermined time has elapsed since the circulation of the coating liquid 1a, and after the predetermined time has elapsed, the first pump 24 is driven at the first speed. It can drive at a slower second speed (low speed). The operation control of the control device 5 in the coating mode is repeatedly performed when the operation mode is set to the coating mode in the operation mode determination operation of FIG.

  Next, FIG. 14 is a flowchart showing operation control of the control device 5 in the cleaning mode of FIG. As shown in FIG. 14, when the control device 5 starts the operation control in the cleaning mode, the controller 5 discharges the coating liquid 1a from the doctor chamber 230 (step S30). The coating liquid 1a is discharged from the doctor chamber 230 through the supply path 21 when the first pump 24 is reversely driven, and is returned to the coating liquid tank 1 through the suction nozzle 20a. Further, the coating liquid 1a in the discharge path 22 falls from the discharge nozzle 20b to the coating liquid tank 1 by its own weight. In this discharge operation, the first pump 24 is reversely driven at a high speed, and the nozzle is arranged so that the tip of the suction nozzle 20a is located above the liquid surface of the coating liquid 1a in the coating liquid tank 1. The unit 20 (the suction nozzle 20a and the discharge nozzle 20b) is raised.

  When a predetermined time has elapsed after the discharge of the coating liquid 1a has started, the control device 5 displaces the nozzle unit 20 to the position of the circulation cleaning liquid tank 3 (step S31), and the circulation and side of the circulation cleaning liquid 3a. The cleaning liquid new liquid 40a is ejected from the nozzle 44 (step S32). Circulation of the circulation cleaning liquid 3a is performed by driving the first pump 24 after the nozzle unit 20 is lowered so that the tip of the suction nozzle 20a is immersed in the circulation cleaning liquid 3a in the circulation cleaning liquid tank 3. Done. The injection of the new liquid 40 a of the cleaning liquid from the side nozzle 44 is performed by driving the second pump 41 after the flow path from the new liquid tank 40 is connected to the side nozzle 44 by the operation control of the flow path control mechanism 42. Done. The control device 5 closes and opens the discharge path 22 by the occluder 25 (see FIG. 9) during the circulation of the circulation cleaning liquid 3a, and cleans the bent portion 220 of the discharge path 22.

  When a predetermined time elapses after the circulation of the circulation cleaning liquid 3a is started, the control device 5 discharges the circulation cleaning liquid 3a from the doctor chamber 230 (step S33). The circulation cleaning liquid 3a is discharged from the doctor chamber 230 through the supply path 21 when the first pump 24 is reversely driven, and returned to the circulation cleaning liquid tank 3 through the suction nozzle 20a. Further, the circulation cleaning liquid 3a in the discharge passage 22 falls from the discharge nozzle 20b to the circulation cleaning liquid tank 3 by its own weight. In this discharge operation, the nozzle unit 20 is raised and the first pump 24 is raised so that the tip of the suction nozzle 20a is positioned above the liquid level of the circulating cleaning liquid 3a in the circulating cleaning liquid tank 3. Reverse driven at speed.

  When a predetermined time elapses after the discharge of the circulation cleaning liquid 3a is started, the control device 5 starts from the cleaning nozzle group 43 (a plurality of chamber cleaning nozzles 430 and a plurality of roll cleaning nozzles 431: see FIGS. 2 to 7). The new liquid 40a of the cleaning liquid is ejected (step S34). The injection of the new liquid 40 a of the cleaning liquid from the cleaning nozzle group 43 is driven after the second pump 41 is driven after the flow path from the new liquid tank 40 is communicated with the cleaning nozzle group 43 by the operation control of the flow path control mechanism 42. Is done. The injection from the in-chamber cleaning nozzle 430 and the injection from the roll cleaning nozzle 431 can be performed simultaneously.

  When a predetermined time elapses after the injection from the cleaning nozzle group 43 is started, the control device 5 discharges the new cleaning liquid 40a from the doctor chamber 230 (step S35). The fresh liquid 40a of the cleaning liquid is discharged from the doctor chamber 230 through the supply path 21 when the first pump 24 is reversely driven, and is sent to the circulating cleaning liquid tank 3 through the suction nozzle 20a. Also, the new cleaning liquid 40a in the discharge path 22 falls from the discharge nozzle 20b to the circulating cleaning liquid tank 3 by its own weight.

  When a predetermined time elapses after the discharge of the new cleaning liquid 40a is started, the control device 5 opens the supply path 21 (step S36). That is, as shown in FIG. 8B, the movable housing 243 is moved away from the rotating body 241 to release the narrowing of the folded portion 212 of the supply path 21. At this time, it is avoided that the new cleaning liquid 40 a in the supply passage 21 falls from the suction nozzle 20 a to the circulating cleaning liquid tank 3 due to its own weight, and the new cleaning liquid 40 a remains in the narrowed portion of the folded portion 212.

  When a predetermined time has elapsed since the opening of the supply path 21 is started, the control device 5 displaces the nozzle unit 20 to the position of the end cleaning device 45 (FIG. 11) (step S37) and the end cleaning device 45. The suction nozzle 20a and the discharge nozzle 20b (end portions of the supply path 21 and the discharge path 22) are cleaned by the above (step S38). That is, the control device 5 causes the suction nozzle 20a and the discharge nozzle 20b to enter the housing 450, and the cleaning liquid is supplied from each spray nozzle 451 while moving the spray nozzle 451 or the suction nozzle 20a and the discharge nozzle 20b up and down. The suction nozzle 20a and the discharge nozzle 20b are cleaned by spraying. After the suction nozzle 20a and the discharge nozzle 20b are cleaned for a predetermined time, the operation control of the control device 5 in the cleaning mode is finished.

  In such a doctor chamber coater, after supplying the cleaning liquid to the main flow path 2, the control device 5 moves the movable housing 243 away from the rotating body 241 and turns the folded portion 212 between the rotating body 241 and the U-shaped side surface 243 a. Therefore, it is possible to reduce the possibility that the components of the coating liquid 1a are disturbed due to the cleaning liquid remaining in the first pump 24.

  Further, since the introduction part 210 and the lead-out part 211 are provided to be inclined with respect to the horizontal, it is more reliably avoided that the cleaning liquid in the supply passage 21 falls due to its own weight and remains in the first pump. it can.

  Such a first pump 24 (tube pump) is configured so that the movable housing 243 can be moved away from the rotating body 241 to release the narrowing of the folded portion 212 between the rotating body 241 and the U-shaped side surface 243a. Therefore, the possibility that the liquid remains inside the first pump 24 can be reduced.

  In addition, since the introduction part 210 and the lead-out part 211 are provided to be inclined with respect to the horizontal, the liquid in the supply path 21 (pipe) falls due to its own weight, and the liquid remains in the first pump 24. It can be avoided more reliably.

  In addition, although embodiment demonstrated the aspect which uses a tube pump (1st pump 24) for a doctor chamber coater, you may use the tube pump which has the above structures for another use. That is, the tube pump having the above-described configuration may be used to send liquids other than the cleaning liquid and the coating liquid.

DESCRIPTION OF SYMBOLS 1a Coating liquid 2 Main flow path 21 Supply path 210 Introduction part 211 Derivation part 212 Folding part 22 Discharge path 24 1st pump (tube pump)
241 Rotating body 243 Movable housing 243a U-shaped side surface 5 Control device

Claims (4)

A main flow path having a supply path, a coating unit including a doctor chamber connected to the supply path, and a discharge path connected to the doctor chamber;
A tube pump provided in the supply path;
A control device, and
The tube pump is
A rotating body, and a U-shaped side surface, and a movable housing disposed on a side of the rotating body,
The supply path is
An introduction part to be introduced into the tube pump;
A lead-out portion led out from the tube pump; and provided between the lead-in portion and the lead-out portion, on the U-shaped side surface so as to pass between an outer edge track of the rotating body and the U-shaped side surface. Has a folded portion arranged along the
The operation mode of the control device includes a cleaning mode in which an existing coating liquid is discharged from the main flow path and a cleaning liquid is supplied to the main flow path.
The controller, after supplying the cleaning liquid to the main flow path, moves the movable housing away from the rotating body, and releases the narrowing of the folded portion between the rotating body and the U-shaped side surface.
Doctor chamber coater. The introduction part and the lead-out part are provided to be inclined with respect to the horizontal.
The doctor chamber coater according to claim 1. Rotating body,
A movable housing having a U-shaped side surface and disposed along the U-shaped side surface so as to pass between an outer edge track of the rotating body and the U-shaped side surface. A pipe having a folded portion provided,
The movable housing is configured to be away from the rotating body so that the stenosis of the folded portion between the rotating body and the U-shaped side surface can be released.
Tube pump. The pipe further includes an introduction part and a lead-out part provided at an end of the folded part,
The introduction part and the lead-out part are provided to be inclined with respect to the horizontal.
The tube pump according to claim 3.

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