JP4313969B2 - Image recording device - Google Patents

Image recording device Download PDF

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Publication number
JP4313969B2
JP4313969B2 JP2001386487A JP2001386487A JP4313969B2 JP 4313969 B2 JP4313969 B2 JP 4313969B2 JP 2001386487 A JP2001386487 A JP 2001386487A JP 2001386487 A JP2001386487 A JP 2001386487A JP 4313969 B2 JP4313969 B2 JP 4313969B2
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JP
Japan
Prior art keywords
negative pressure
pressure
plate
drum
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2001386487A
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Japanese (ja)
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JP2003186205A (en
Inventor
英男 人見
Original Assignee
パナソニック コミュニケーションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to JP2001386487A priority Critical patent/JP4313969B2/en
Publication of JP2003186205A publication Critical patent/JP2003186205A/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image recording apparatus having a configuration in which a plate for recording an image is wound around a drum and held, and in particular, a negative pressure groove that is held at a negative pressure by a negative pressure generating source is provided on the outer peripheral surface of the drum. The present invention relates to an image recording apparatus configured to be closely fixed to an outer peripheral surface.
[0002]
[Prior art]
In an image recording device that records (exposes) an image by irradiating a laser beam onto a metal plate with a surface coated with a light-sensitive material as an image recording medium in flat printing, the drum that is wound around the plate is rotated. In addition, a configuration is adopted in which an image is recorded on the plate by moving the recording head in the axial direction of the drum, whereby a highly accurate printing plate can be formed at high speed.
[0003]
In this type of image recording apparatus, in order to hold the plate on the drum, both ends of the plate are fastened and fixed by clamp members, respectively, and a negative pressure groove that is held at a negative pressure by a vacuum pump is provided on the outer peripheral surface of the drum. A system is adopted in which the plate is brought into close contact with the drum by a differential pressure from the atmospheric pressure. In addition, the clamp member can be moved in the circumferential direction so that it can handle multiple types of plates of different sizes, and negative pressure can be used to ensure the required tight fixing force regardless of the plate size. The groove arrangement pattern is devised.
[0004]
[Problems to be solved by the invention]
However, it is common to monitor the close contact state of the plate by the negative pressure groove with a pressure gauge provided in the middle of the negative pressure pipe connecting the vacuum pump and the negative pressure groove. However, if air is sucked in due to the floating of the plate at a position away from the negative pressure introduction hole where the negative pressure of the vacuum pump is introduced into the negative pressure groove, the negative pressure is affected by the pressure loss corresponding to the flow velocity of the sucked air. The pressure in the pressure pipe does not change immediately, and the pressure gauge in the middle of the negative pressure pipe cannot detect the pressure change in the negative pressure groove with good response. For this reason, there is a disadvantage that it is impossible to accurately grasp the close contact state of the plate with the drum.
[0005]
In newspaper printing, a half-width plate having the same circumferential length as the half width of the full-width plate corresponding to the axial width of the drum may be used, and the half-width plates are arranged in the drum axial direction. If two sheets can be attached, or one half-width plate can be attached to half of the drum, the usability is improved and the efficiency of the printing plate process can be improved. However, in the conventional image recording apparatus, since the plate mounting areas of various sizes are set with reference to the central portion in the axial direction of the drum, the plate is appropriately tightly fixed in the mounting mode as described above. There was an inconvenience that could not be.
[0006]
Furthermore, in the above-mentioned image recording apparatus of the plate tightly fixing method by negative pressure, when a pump stop accident such as a power failure occurs, air flows backward from the vacuum pump side and the pressure in the negative pressure groove rises. There is a risk that the fixing force will decrease and the plate may come off from the drum. To avoid this, a check valve may be provided in the middle of the pipe connecting the vacuum pump and the negative pressure groove. Therefore, it is convenient to be able to prepare for a pump stop accident with a simple configuration that does not require a check valve.
[0007]
The present invention has been devised in order to solve such problems of the prior art, and a first object of the present invention is to be able to grasp the contact state of the plate with the drum with high accuracy. Another object of the present invention is to provide an image recording apparatus. Furthermore, the second object of the present invention is to configure the image recording apparatus so that a half-width plate used in newspaper printing can be appropriately tightly fixed. In addition to this, the third object of the present invention is to configure the image recording apparatus so as to be prepared for a pump stop accident with a simple configuration.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, according to the present invention, as shown in claim 1, a clamp member is provided on a drum around which a plate for recording an image is wound to clamp and fix the end of the plate, and negative pressure is generated. In an image recording apparatus in which a negative pressure groove held at a negative pressure by a source is provided on the outer peripheral surface of the drum and the plate is closely fixed to the outer peripheral surface of the drum , the image recording apparatus is provided near the end of the drum outer peripheral surface in the drum axial direction. , the negative pressure introduced connected via the negative pressure path in the first pressure detecting means for detecting the negative pressure groove pressure of a negative pressure introduction hole for introducing a negative pressure negative pressure source to the negative pressure groove A negative pressure detector which opens a hole and is connected to a second pressure detection means for detecting the pressure of the negative pressure groove on the terminal side of the negative pressure groove starting from the negative pressure introduction hole via a pressure guiding path It opened a hole, negative pressure at the beginning of the negative pressure groove First pressure detecting means is detected by detecting the pressure of the road, the second pressure detecting means and detects through the pressure introduction passage and the negative pressure Deana pressure at the end of the negative pressure groove.
[0009]
According to this, a pressure detection means detects a pressure increase generated in the negative pressure groove portion ahead of the abnormal portion due to air suction caused by the plate floating or the like through the negative pressure detection hole on the terminal end side of the negative pressure groove. Therefore, it is possible to detect an abnormality in the close contact state of the plate with high accuracy. In this case, in order for the negative pressure detection hole to function, it is desirable that at least the periphery of the negative pressure detection hole is covered with a plate, and if possible, the entire negative pressure groove is covered with the plate.
[0010]
According to a second aspect of the present invention, in the image recording apparatus of the first aspect, a half-width plate having the same circumferential length as the half width of the full width plate corresponding to the axial width of the drum is provided on the outer peripheral surface of the drum. A pair of corresponding plate mounting areas are set, and the negative pressure grooves in the pair of plate mounting areas are independent of each other without being communicated with each other, and negative pressure is guided by different negative pressure paths. .
[0011]
According to this, airtightness can be improved in units of negative pressure system corresponding to a pair of half-width plate mounting regions, and the plate can be firmly fixed in any plate mounting state and at the same time the efficiency of negative pressure fixing can be improved. Can do. In this case, if one full-width plate or two half-width plates cover both of the pair of half-width plate mounting areas, both negative pressure systems are operated and one half-width plate is attached to a pair of half-width plates. When either one of the regions is covered, the negative pressure system corresponding to the corresponding half-width plate mounting region may be operated.
[0012]
Further, the invention of claim 3 is the image recording apparatus according to claim 1, wherein a plurality of plate mounting regions having different negative pressure paths for introducing negative pressure into the negative pressure groove are set on the outer peripheral surface of the drum . A vacuum pump as a negative pressure generation source is shared among a plurality of negative pressure systems corresponding to the plate mounting area, and normally closed on-off valves are provided in each of the negative pressure paths branched from the vacuum pump. .
[0013]
According to this, the negative pressure system corresponding to the required plate mounting region corresponding to the plate mounting state can be operated by opening / closing the opening / closing valve, thereby enabling efficient negative pressure fixing. In addition, the normally-closed on-off valve prevents the backflow of air from the vacuum pump side by returning to the closed state in the event of a pump stop accident due to a power failure or the like, and maintains the negative pressure groove in the negative pressure state. Separation of the plate during rotation can be avoided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0015]
FIG. 1 is a perspective view showing an image recording apparatus constructed according to the present invention. In this image recording apparatus, a plate 1 as a printing plate for newspaper is wound and held around a drum 2, the drum 2 is rotated by a drum rotating motor 3, and the recording head 4 is moved in the axial direction of the drum 2 by a linear motor. An image is recorded on the plate 1 by running, and clamp members 5 and 6 are provided on the drum 2 to clamp and fix the end of the plate 1, and negative pressure is generated by a vacuum pump (negative pressure generating source) 8 and 9. A negative pressure groove 7 held by pressure is provided on the outer peripheral surface of the drum 2 so that the plate 1 is closely fixed to the outer peripheral surface of the drum 2.
[0016]
The clamp members 5 and 6 clamp and fix the plate 1 between the outer peripheral surface of the drum 2 and can be opened and closed to switch between fixing and releasing the plate 1. Corresponding to the dimensions, the drum 2 is fixed at a predetermined position on the outer peripheral surface. In order to attach the plate 1 to the drum 2, the plate 1 is fed toward the front end side clamp member 5, the front end portion 1a of the plate 1 is fixed by the front end side clamp member 5, and the drum 2 is rotated in a required direction. After the plate 1 is wound around the drum 2, the rear end portion 1 b of the plate 1 may be fixed by the rear end side clamp member 6. In order to remove the plate 1 from the drum 2, the rear end side clamp member 6 is unlocked and rotated in the reverse direction to feed the plate 1 toward a predetermined plate discharge portion. After releasing, the plate 1 may be drawn into the plate discharge portion.
[0017]
FIG. 2 is a perspective view showing a plurality of plate attachment states in the image recording apparatus shown in FIG. Plate 1, which is a printing plate for newspaper printing, has a full width plate (2W2L size, 800mm x 1100mm) corresponding to the full width of drum 2, and a half width plate (1W2L size, 400mm x 1100mm) half the width of this full width plate 2A, when one full width plate P1 is attached as shown in FIG. 2A, when two half width plates P2 are attached as shown in FIG. 2B, FIG. When one half-width plate P2 is attached to the first plate attachment region 11 as shown in FIG. 2 and when one half-width plate P2 is attached to the second plate attachment region 12 as shown in FIG. There are a total of four aspects. Both aspects shown in FIGS. 2A and 2B are equivalent in terms of negative pressure fixing operation, and will be described below as a first plate mounting state. The mode shown in FIG. 2C is the second plate mounting state, and the mode shown in FIG. 2D is the third plate mounting state.
[0018]
As shown in FIG. 1, on the outer peripheral surface of the drum 2, a pair of plate attachment regions 11 corresponding to half-width plates having the same width in the circumferential direction and half the width of the full-width plate corresponding to the axial width of the drum 2 are used. 12 is set, and the negative pressure grooves 7 in the pair of plate mounting regions 11 and 12 are made independent without communicating with each other, and the negative pressure grooves (negative pressure paths) 15 and 16 are different from each other. 7, the negative pressures of the first and second vacuum pumps 8 and 9 are introduced, respectively. The negative pressure pipes 15 and 16 are connected to the rotary seal portion 14 and are connected to the negative pressure groove 7 via a negative pressure introduction path inside the drum 2. Further, for each negative pressure system corresponding to the pair of plate mounting regions 11 and 12, pump side pressure gauges 21 and 22 for detecting the pressure of the negative pressure pipes 15 and 16 and pressure guiding pipes (pressure guiding paths) 17 and 18 are provided. Drum side pressure gauges (pressure detecting means) 23 and 24 for detecting the pressure in the negative pressure groove 7 are provided.
[0019]
FIG. 3 is a development view of the drum shown in FIG. On the outer peripheral surface of the drum 2, a negative pressure introduction hole 31 for introducing the negative pressure of the vacuum pumps 8 and 9 into the negative pressure groove 7 is opened, and the negative pressure groove 7 starting from the negative pressure introduction hole 31 is formed. A negative pressure detection hole 32 connected to the drum side pressure gauges 23 and 24 for detecting the pressure in the negative pressure groove 7 through the pressure guiding pipes 17 and 18 is provided on the end side. The negative pressure introduction holes 31 are concentrated in the negative pressure introduction hole arrangement portion 33 near the end in the drum axis direction in the vicinity of the front end side clamp member 5. The negative pressure detection hole 32 is concentrated on the negative pressure detection hole arrangement portion 34 near the end in the drum axis direction on the rear end side clamp member 6 side from the circumferential center of the plate mounting regions 11 and 12. Yes. The arrangement pattern of the negative pressure groove 7, the negative pressure introduction hole arrangement portion 33, and the negative pressure detection hole arrangement portion 34 are provided symmetrically in the first and second plate attachment regions 11 and 12. The negative pressure introduction hole arrangement portion 33 and the negative pressure detection hole arrangement portion 34 are arranged so that their axial positions are substantially coincided with each other in order to facilitate the arrangement of the path inside the drum 2.
[0020]
The negative pressure groove 7 is provided over substantially the entire area of the first and second plate mounting regions 11 and 12. The circumferential negative pressure groove 7 and the axial negative pressure groove 7 form a lattice shape as a whole. These patterns are formed, but are divided at necessary portions for the convenience of introduction of negative pressure and pressure detection. Specifically, the circumferential negative pressure groove 7a is provided in a form that is continuous over substantially the entire region of the plate attachment regions 11 and 12, and this pair of adjacent circumferential negative pressure grooves 7a intersects with this in a ladder shape. A negative pressure band 35 that is long in the circumferential direction is formed in a state of being communicated with each other by the plurality of axial negative pressure grooves 7b, and these negative pressure bands 35 are communicating portions that extend in the axial direction at a portion near the rear end side clamp member 6. 36 communicate with each other.
[0021]
FIG. 4 is a developed view showing in detail the main part of the drum shown in FIG. In the negative pressure introduction hole arrangement portion 33, a negative pressure introduction hole 31 for introducing a negative pressure into the negative pressure groove 7 belonging to each negative pressure zone 35 is provided for each negative pressure zone 35 individually. The negative pressure zone 35 closest to the center in the axial direction is connected to the negative pressure introduction hole 31 through an end edge portion 38 provided along the front end side clamp member 5. Further, the communication portion 36 on the rear end side clamp member 6 side is connected to an end edge portion 41 provided along the rear end side clamp member 6 via a connection portion 40 provided in the central portion in the axial direction. A negative pressure detection hole arrangement portion 34 is provided at the tip of a circumferential portion 42 extending forward from a portion near the end portion in the axial direction of the end edge portion 41, and the negative pressure detection hole 32 extends from the negative pressure introduction hole 31. Located farthest to see.
[0022]
FIG. 5 is a cross-sectional view of the drum shown in FIG. Inside the drum 2, negative pressure introduction passages 51 and 52 for introducing the negative pressure of the vacuum pump to the negative pressure introduction hole 31 are provided, and the pressure in the negative pressure groove 7 is detected via the negative pressure detection hole 32. For this purpose, pressure guiding paths 53 and 54 are provided. The negative pressure introduction paths 51 and 52 and the pressure guiding paths 53 and 54 are connected to the negative pressure pipes 15 and 16 and the pressure guiding pipes 17 and 18 via the rotary seal portion 14 shown in FIG.
[0023]
FIG. 6 is a block diagram showing a first embodiment of the piping configuration of the image recording apparatus shown in FIG. The pump side pressure gauges 21 and 22 detect the pressures of the negative pressure pipes 15 and 16 connecting the first and second vacuum pumps 8 and 9 and the negative pressure grooves in the plate mounting regions 11 and 12 to detect the drum side pressure. The totals 23 and 24 detect the pressure on the terminal end side of the negative pressure groove through the pressure guide pipes 17 and 18, the rotary seal to which the pressure guide pipes 17 and 18 are connected, and the negative pressure detection hole of the negative pressure detection hole arrangement portion. The negative pressure pipes 15 and 16 are provided with a check valve and a tank so as to maintain the negative pressure state of the negative pressure groove in the event of a pump stop accident due to a power failure or the like.
[0024]
The detection signals of the pump-side pressure gauges 21 and 22 and the drum-side pressure gauges 23 and 24 are input to the control unit 61, where the contact state of the plates is abnormal based on the detected pressure values of the pressure gauges 21 to 24. If it is determined that there is an abnormality, the drum rotation motor 3 is stopped. Further, the control unit 61 receives a signal of information regarding the plate mounting state from the host 62 constituting the upper plate making system, and based on this information, negative signals corresponding to the first and second plate mounting regions 11 and 12 are input. It is determined which of the pressure systems needs to be operated, and an operation signal is output to the required vacuum pumps 8 and 9.
[0025]
FIG. 7 is a graph showing an example of a procedure for detecting an abnormality based on the detected pressure in the pressure gauge shown in FIG. Here, when the pressure detected by the pressure gauges 21 to 24 exceeds the threshold value and enters the dangerous pressure region, it is determined as abnormal. When air is sucked in the poorly adhered portion of the plate 1 and the pressure in the negative pressure groove 7 is increased, the detected values of the drum side pressure gauges 23 and 24 immediately increase, and the pump side pressure gauge 21. The detection value of 22 increases. For this reason, an abnormality can be detected earlier than the configuration of the pump-side pressure gauges 21 and 22 alone.
[0026]
FIG. 8 is a graph showing another example of the procedure for detecting an abnormality based on the detected pressure in the pressure gauge shown in FIG. Here, when the pressure difference between the drum-side pressure gauges 23 and 24 and the pump-side pressure gauges 21 and 22 exceeds a predetermined allowable value, it is determined that there is an abnormality.
[0027]
FIG. 9 is a flowchart showing the operation procedure of the image recording apparatus shown in FIG. Here, the image recording operation is performed according to the first, second, and third plate mounting states shown in FIG. 2, and the required negative pressure system is operated according to the plate mounting state. Yes. First, plate information is acquired from the host (step 101), and the control unit determines which of the first, second, and third plate mounting states corresponds (step 102), and corresponds to the corresponding plate mounting state. The recorded image operation is performed (steps 103, 104, and 105).
[0028]
FIG. 10 is a flowchart showing the procedure of the image recording operation shown in FIG. First, the plate 1 is fed in and the plate 1 is fixed by the front end side clamp member 5 (step 201), and then the vacuum pumps 8 and 9 are operated (step 202). Here, the first and second vacuum pumps 8 and 9 are operated in the first plate mounting state, the first vacuum pump 8 is operated in the second plate mounting state, and the first plate mounting state is the first plate mounting state. 2 vacuum pump 9 is activated. Next, the plate 1 is wound around the drum 2 while rotating the drum 2, and the plate 1 is fixed by the rear end side clamp member 6 (step 203). Thus, by introducing the negative pressure into the negative pressure groove provided in the vicinity of the front end side clamp member 5 from the beginning of the winding operation of the plate 1, the plate 1 can be wound while closely contacting the drum 2. Thus, the slack of the plate 1 can be avoided.
[0029]
Next, pressure detection by the pressure gauges 21 to 24 is started (step 204). Here, in the first plate mounting state, the pump-side pressure gauges 21 and 22 and the drum-side pressure gauges of both the first and second negative pressure systems. 23 and 24, the detected pressures of the pressure gauges 21 and 23 of the first negative pressure system are monitored in the second plate mounting state, and the second negative pressure system of the second negative pressure system is monitored in the third plate mounting state. The pressure detected by the pressure gauges 22 and 24 is monitored. Then, after adjusting the drum 2 to the recording start position, recording processing by high-speed rotation of the drum 2 is started (step 205), and when the recording is completed, the pressure detection by the pressure gauges 21 to 24 is ended (step 206).
[0030]
Next, after the rotation of the drum 2 is stopped, the fixation of the plate 1 by the rear end side clamp member 6 is released (step 207), and then the drum 2 is reversely rotated to feed out the plate 1 (step 208). Then, the vacuum pumps 8 and 9 are stopped (step 209), the fixation of the plate 1 by the front end side clamp member 5 is released, the plate 1 is removed from the drum 2 and discharged (step 210), and the standby state is set (step 211). ). Thus, by continuing the introduction of the negative pressure into the negative pressure groove until the feeding of the plate 1 by the rotation of the drum 2 is completed, it is possible to smoothly feed the plate 1 while avoiding the slack of the plate 1.
[0031]
FIG. 11 is a block diagram showing a second embodiment of the piping configuration of the image recording apparatus shown in FIG. Here, the vacuum pump 111 serving as a negative pressure generation source is shared between the first and second negative pressure systems corresponding to the first and second plate mounting regions 11 and 12, and the vacuum pump 111 is branched. The first and second negative pressure pipes (negative pressure paths) 112 and 113 are provided with normally closed (normally closed) type first and second on-off valves 114 and 115, respectively. The on-off valves 114 and 115 are solenoid valves that are actuated by solenoids, and are opened and closed by an operation signal from the control unit 61. At the time of image recording operation, the vacuum pump 111 is operated, and the open / close valves 114 and 115 of the negative pressure system corresponding to the required plate mounting regions 11 and 12 are opened according to the plate mounting state, and the required plate mounting region. A negative pressure is introduced into the negative pressure grooves in 11 and 12. Further, in the event of a pump stop accident due to a power failure or the like, the backflow of air from the vacuum pump 111 side is prevented by the on-off valves 114 and 115 that have returned to the closed state, and the negative pressure groove can be maintained in a negative pressure state. .
[0032]
FIG. 12 is a flowchart showing an operation procedure in the piping configuration shown in FIG. First, the plate 1 is fixed by the front end side clamp member 5 (step 301), the electromagnetic valves 114 and 115 are operated (step 302), and the vacuum pump 111 is operated (step 303). Here, the first and second electromagnetic valves 114 and 115 are opened in the first plate mounting state, the first electromagnetic valve 114 is opened in the second plate mounting state, and the second plate is mounted in the third plate mounting state. The solenoid valve 115 is opened. Next, the plate 1 is wound around the drum 2 while rotating the drum 2, and the fixing operation of the plate 1 by the rear end side clamp member 6 is performed (step 304).
[0033]
Next, pressure detection by the pressure gauges 21 to 24 is started (step 305). Here, in the first plate mounting state, the pump-side pressure gauges 21 and 22 and the drum-side pressure gauges of the first and second negative pressure systems. 23 and 24, the detected pressures of the pressure gauges 21 and 23 of the first negative pressure system are monitored in the second plate mounting state, and the second negative pressure system of the second negative pressure system is monitored in the third plate mounting state. The pressure detected by the pressure gauges 22 and 24 is monitored. Then, after adjusting the drum 2 to the recording start position, recording processing by high-speed rotation of the drum 2 is started (step 306), and when the recording is completed, pressure detection by the pressure gauges 21 to 24 is ended (step 307).
[0034]
Next, after the rotation of the drum 2 is stopped, the fixation of the plate 1 by the rear end side clamp member 6 is released (step 308), and then the drum 2 is reversely rotated to feed out the plate 1 (step 309). Then, the vacuum pump 111 is stopped (step 310), and the electromagnetic valves 114 and 115 are released (step 311). Next, the fixation of the plate 1 by the front end side clamp member 5 is released, the plate 1 is removed from the drum 2 and discharged (step 312), and the standby state is set (step 313).
[0035]
【The invention's effect】
As described above, according to the present invention, the pressure increase generated in the negative pressure groove portion ahead of the abnormal portion due to the suction of the air due to the floating of the plate or the like is detected by the negative pressure detection hole on the terminal side of the negative pressure groove. Accordingly, the pressure detection means can detect the response with good response, so that it is possible to detect an abnormality in the close contact state of the plate with high accuracy. In addition, in the configuration in which the half-width plate is used, the airtightness can be improved by the negative pressure system unit corresponding to the pair of half-width plate mounting regions, and the plate is firmly fixed and fixed at the same time in any plate mounting state. Efficiency can be improved. Furthermore, by operating a negative pressure system corresponding to the required plate mounting area according to the plate mounting state with a normally closed on-off valve, it is possible to efficiently fix negative pressure and prepare for a pump stop accident with a simple configuration be able to.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an image recording apparatus constructed according to the present invention. FIG. 2 is a perspective view showing a state in which a plurality of plates are attached in the image recording apparatus shown in FIG. FIG. 4 is a development view showing in detail a main part of the drum shown in FIG. 1. FIG. 5 is a sectional view of the drum shown in FIG. 1. FIG. 6 is a pipe of the image recording apparatus shown in FIG. FIG. 7 is a block diagram showing the first embodiment of the configuration. FIG. 7 is a graph showing an example of a procedure for detecting an abnormality based on the detected pressure in the pressure gauge shown in FIG. 6. FIG. FIG. 9 is a flow chart showing the operation procedure of the image recording apparatus shown in FIG. 1. FIG. 10 is a flowchart showing the image recording operation procedure shown in FIG. FIG. 11 is a block diagram showing a second embodiment of the piping configuration of the image recording apparatus shown in FIG. 12 is a flow diagram showing the procedure of operation in the piping arrangement shown in FIGS. 11 - Description of symbols]
DESCRIPTION OF SYMBOLS 1 plate, P1 full width plate, P2 half width plate 1a Front end part, 1b Rear end part 2 Drum 5 Front end side clamp member 6 Rear end side clamp member 7 Negative pressure groove 8/9 Vacuum pump (negative pressure generation source)
11.12 Plate mounting area 15.16 Negative pressure piping (negative pressure path)
17.18 Induction piping (Induction channel)
21, 22 Pump side pressure gauge 23, 24 Drum side pressure gauge (pressure detection means)
31 Negative pressure introduction hole 32 Negative pressure detection hole 53/54 Induction path 111 Vacuum pump (negative pressure generation source)
112/113 Negative pressure piping (negative pressure path)
114/115 On-off valve

Claims (3)

  1. A clamp member is provided on a drum around which a plate for recording an image is wound to fasten and fix the end of the plate, and a negative pressure groove that is held at a negative pressure by a negative pressure source is provided on the outer peripheral surface of the drum. An image recording apparatus for closely fixing the plate to the outer peripheral surface of the drum,
    A negative pressure introduction hole provided near the end in the drum axial direction of the outer peripheral surface of the drum and for introducing a negative pressure of a negative pressure generating source into the negative pressure groove, and detecting a pressure of the negative pressure groove. A negative pressure introducing hole connected to the pressure detecting means via a negative pressure path, and detecting the pressure of the negative pressure groove on the end side of the negative pressure groove starting from the negative pressure introducing hole Opening a negative pressure detection hole connected to the second pressure detection means via a pressure guiding path, and detecting the pressure at the starting end of the negative pressure groove by detecting the pressure in the negative pressure path, the first pressure detection And the second pressure detection means detects the pressure at the end of the negative pressure groove via the pressure guiding path and the negative pressure detection hole .
  2. The outer peripheral surface of the drum, setting the pair of plate mounting region corresponding to the half-width plate were identical to half the width of the full width plate circumferential direction length corresponding to the axial width of the drum, the pair of plate mounting 2. The image recording apparatus according to claim 1 , wherein the negative pressure grooves in the region are independent of each other without being communicated with each other, and negative pressure is guided by different negative pressure paths.
  3. A plurality of plate mounting areas having different negative pressure paths for introducing a negative pressure into the negative pressure groove are set on the outer peripheral surface of the drum, and the negative pressure system corresponding to the plurality of plate mounting areas has the negative pressure system. 2. The image recording apparatus according to claim 1 , wherein a vacuum pump as a pressure generation source is shared, and a normally closed on-off valve is provided in each of the negative pressure paths branched from the vacuum pump.
JP2001386487A 2001-12-19 2001-12-19 Image recording device Expired - Fee Related JP4313969B2 (en)

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JP4313969B2 true JP4313969B2 (en) 2009-08-12

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