JPH04221673A - Apparatus for cleaning blanket cylinder - Google Patents

Abstract

PURPOSE:To easily clean a blanket cylinder within a short time by providing a movable body wherein a wiping member impregnated with a cleaner is connected to a drive part and moving the movable body after printing to bring the same into contact with the blanket cylinder. CONSTITUTION:The ink bonded to a printing part is transferred to the blanket 9 of a blanket cylinder 8. Since the paper 25 from a paper supply cassette 4 is held between the blanket cylinder 8 and a press roller 32, the image on the blanket cylinder 8 is transferred to the paper 25. When a cleaning button 81 is pressed after printing is completed, a solenoid 42 is driven and a movable body 43 is revolved and a wiping member 44 comes into contact with the blanket cylinder 8. By this method, the ink remaining on the outer periphery of the blanket cylinder 8 is wipen off by the wiping member 44. Herein, a washing agent 39 is supplied to the wiping member 44.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blanket cylinder cleaning device used in offset type light printing presses.

0002

2. Description of the Related Art When printing advertising flyers and the like using a simple offset type light printing machine, it is necessary to remove ink adhering to the blanket cylinder after printing. Conventionally, in light printing presses, a cleaning agent is applied to a blanket cylinder by spray and then wiped off with a cloth, but this operation is performed carefully by an operator.

0003

[Problem to be solved by the invention] In the conventional cleaning method,
The blanket cylinder must be cleaned manually each time the print content is changed, so cleaning is often required when printing multiple types of materials, making cleaning work difficult, dirty hands, and time-consuming. There is also a problem.

0004

[Means for Solving the Problems] The invention according to claim 1 provides a blanket cylinder to which an ink image is transferred, a pressing member that is pressed against the blanket cylinder, and a pressing member that is connected to a drive unit and that is applied to the outer peripheral surface of the blanket cylinder. A movable body disposed so as to be freely displaceable in approaching and moving directions, a wiping member held by the movable body and facing the blanket cylinder, and a cleaning agent receiver that holds cleaning agent in contact with the wiping member. It was constructed by

[0005] According to a second aspect of the invention, in the first aspect, a residual ink amount detecting means is provided in the cleaning agent receiver.

[0006]

[Operation] After printing is completed, the movable body is moved by the drive unit to bring the wiping member impregnated with the cleaning agent in the cleaning agent receiver into contact with the blanket cylinder, and in this state, the blanket cylinder is rotated. This makes it possible to clean the blanket cylinder easily and in a short time.

[0007] According to the second aspect of the invention, it is possible to know when to replenish ink to the detergent receiver by means of the remaining ink amount detecting means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained based on the drawings. FIG. 2 is a perspective view showing the overall structure. In the figure, 1 is a main body, a guide 3 for guiding a paper plate 2 is provided at the top of the main body 1, and a paper feed cassette 4 is provided at the rear. It is detachably mounted, and the front part is provided with a sheet discharge tray 5 and an operation panel 6 located above it.

Next, as shown in FIG.
Inside, a master cylinder 7 around which the paper plate 2 is wound and a blanket cylinder 8 are rotatably connected to a motor. This blanket cylinder 8
has a rubber blanket 9 on the outer periphery. Further, an ink reservoir 10 is provided near the master cylinder 7. The ink reservoir 10 includes a plurality of mixing rollers 11, 12, 13, and 14 arranged in parallel, and an ink receiving plate 15 facing the mixing roller 11 with a predetermined gap therebetween. Furthermore, an inking roller 18 is provided which is held by an arm 17 that rotates about a support shaft 16 and which comes into contact with and separates from the master cylinder 7 and the kneading roller 14 . An ink nozzle 19 and a water nozzle 20 are provided above the ink reservoir section 10 so as to be movable along the axis of the master cylinder 7, and a drain section 21 is provided below. The liquid drain section 21 is formed by housing an absorbent body 22 having good absorbency against ink and water in a case 23. The paper feed cassette 4 arranged at the lower part of the liquid draining section 21 has a mounting plate 26 that is pressed by a pressing body 24 and supports the paper 25. It is conveyed to the lower outer periphery of the blanket cylinder 8 by this. Further, a buckle plate 31 is connected to a lever 30 driven by a solenoid 29 and aligns the leading edge of the paper 25 with the pickup roller 27 and the transport roller 2.
It is located between 8 and 8. Furthermore, a lever 33 that holds a pressing roller 32, which is a pressing body facing the lower outer periphery of the blanket cylinder 8, is connected to a solenoid 34. Furthermore, a peeling roller 35 is rotatably provided near the master cylinder 7, and a void case 37 having a feed roller 36 located near the peeling roller 35 at its entrance is provided. A cleaning agent receiver 40 is provided below the void case 37 to receive the liquid cleaning agent 39 dripped from the cleaning agent tank 38, and a hygroscopic cleaning agent pad 41 is provided in the cleaning agent receiver 40. There is. And the solenoid 4 whose upper end is the driving part
At the lower end of a rotatable movable body 43 connected to the cleaning agent pad 2, a wiping member 44 made of a roller that comes into contact with the cleaning agent pad 41 and the blanket cylinder 8 is rotatably held. This wiping member 44 has a length equivalent to the length of the blanket cylinder 8 in the axial direction, and the cleaning agent 39
It is made of a material that is impregnated with. The movable body 4
3 is urged away from the blanket cylinder 8 by a spring 45. 46 is a fan.

As shown in FIG. 1, the cleaning pad 41 is pressed against the wiping member 44 by the urging force of a leaf spring 47. As shown in FIG. Here, a valve mechanism 48 is provided at the lower part of the cleaning agent tank 38, and an opening/closing mechanism 49 for opening and closing this valve mechanism 48 is provided. This opening/closing mechanism 49 is
A sliding rod 51 slidably fitted into a cylindrical guide member 50 provided on the cleaning agent receiver 40, a link 52 rotatably connected to the lower end of the sliding rod 51, and a link 52 at both ends. is comprised of a lever 56 rotatably connected to this link 52 and a plunger 54 of a solenoid 53. This lever 5
6 is rotatably held on a support shaft 55. The sliding rod 51 is urged downward by a spring 57.

As shown in FIGS. 4(a) and 4(b), an O-ring 58 is fitted around the outer periphery of the sliding rod 51. As shown in FIGS. Next, the valve mechanism 48 will be explained. That is, a cap 59 is screwed onto the lower part of the cleaning agent tank 38, and an inner lid 60 is provided inside the cap 59. Inside the inner cover 60, there is a movable valve 63, which has a core rod 61 slidably held by the inner cover 60 and the cap 59 at its center and has a packing 62 fixed to its lower surface, and is movable up and down. It is set in. This movable valve 63 has a spring 64
is urged downward by. Further, a through hole 65 is formed in the upper surface of the inner lid 60, a through hole 66 is formed in the movable valve 63 and the packing 62, and a through hole 66 is formed in the upper surface of the cap 5.
9 and packing 6 fixed to the inner surface of this cap 59
A through hole 68 is formed in and 7. In addition, the through hole 66,
68 are formed at different positions so that their opening ends do not coincide with each other. Further, the lower end of the core rod 61 is in contact with the upper end of the sliding rod 51.

Next, FIG. 5 shows the structure of the cleaning agent remaining amount detection means 70. 71 is a plate, and this plate 71 has a shaft 72 that projects in the vertical direction and a float 73 fixed to the lower end of this shaft 72. Further, the cleaning agent receiver 40
The shaft 72 is slidably held by a bearing 76 fixed to a frame 75 and an upper part of a liquid volume measuring chamber 74 connected to the liquid volume measuring chamber 74 . Further, the substrate 7 fixed to the frame 75
7 is provided with an upper limit level sensor 78, a level sensor 79, and a lower limit level sensor 80 for detecting passage of the upper edge of the plate 71.

As shown in FIG. 6, the operation panel 6 includes a cleaning button 81 and a cleaning agent remaining amount detecting means 70.
An empty display section 82 and an abnormality display section 83 are provided to display the detection results.

Next, FIG. 7 shows an electronic circuit. CPU84
A ROM 85 in which a program is written and a RAM 86 in which variable data is written are connected to the upper limit level sensor 78, the level sensor 79, the lower limit level sensor 80, the solenoids 42 and 53, and the empty display section 82. The abnormality display section 83 is connected to the CPU 84 via an I/O port 87.

In such a configuration, the ink receiving plate 1
5 is supplied with ink from an ink nozzle 19. Further, the water supplied from the water nozzle 20 soaks the paper plate 2 held in the master cylinder 7. This water soaks into the non-printing area of the paper plate 2, but is repelled by the printing area. The ink in the ink reservoir 10 is kneaded by kneading rollers 11 , 12 , 13 , and 14 and supplied to the paper plate 2 on the master cylinder 7 from the inking roller 18 . This ink is repelled by the water-soaked non-printing areas of the paper plate 2, but adheres to the printing areas. The ink adhering to this printing section is transferred to the blanket 9 of the blanket cylinder 8, and then the paper 25 fed from the paper feed cassette 4 is held between the blanket cylinder 8 and the pressure roller 32, so the blanket cylinder 8 The upper image is transferred to paper 25. This paper 25 has fan 4
The transferred image is dried while being separated from the blanket cylinder 8 by the wind from the blanket cylinder 6 . Furthermore, by operating the operation unit 6 to specify the number of sheets to be printed, when the number of sheets to be printed reaches a predetermined number, the paper plate 2 on the master cylinder 7 is peeled off from the master cylinder 7 by the peeling roller 35. It is stored in the void case 37 by the feed roller 36.

After printing is completed, when the cleaning button 81 is pressed, the solenoid 42 is driven, the movable body 43 is rotated counterclockwise, and the wiping member 44 is moved to the blanket cylinder 9.
be contacted. As a result, the ink remaining on the outer periphery of the blanket cylinder 8 is wiped off by the wiping member 44. Here, the cleaning agent 39 is supplied to the wiping member 44 from the cleaning agent receiver 40 . Cleaning agent receiver 4 from cleaning agent tank 38
1, the cleaning agent 39 is supplied to the valve mechanism 4 by driving the solenoid 53 and sliding the sliding rod 51 upward.
This is done by opening 8. In other words, Figure 4 (
A) shows a state in which the valve mechanism 48 is closed, but when the sliding rod 51 rises as shown in FIG. 4(b), the movable valve 63 is pushed upward together with the core rod 61, and the cleaning agent is The cleaning agent 39 in the tank 38 flows into the cleaning agent receiver 40 through the through holes 65, 66, and 68.

Furthermore, since the plate 71 moves up and down together with the float 73 due to changes in the level of the cleaning agent 39 in the cleaning agent receiver 40, the vertical position of the plate 71 is detected by level sensors 78, 79, and 80. The remaining amount of cleaning agent 39 in cleaning agent receiver 40 is detected.

Next, the operation of replenishing the cleaning agent 39 to the cleaning agent receiver 40 will be explained with reference to the flowchart of FIG. 8 and the timing chart of FIG. 9. When the level sensor 79 is OFF, it means that the remaining amount of the cleaning agent 39 is small. At this time, the solenoid 53 is driven and the valve mechanism 4
8 is opened, the cleaning agent 39 is replenished into the cleaning agent receiver 40. As a result, when the level of the cleaning agent 39 in the cleaning agent receiver 40 rises and the level sensor 79 is turned on, the solenoid 53 is turned off and the valve mechanism 48 is maintained in the closed state. While the solenoid 53 is being driven to replenish the cleaning agent 39, it is determined whether the level sensor 79 is ON or not. If it is determined to be OFF, then the solenoid 53 is kept ON for T time. If the T time has not been reached, the solenoid 5 is still maintained.
The replenishment operation according to step 3 continues, but if the T time is exceeded, the detection signal of the lower limit level sensor 80 is subsequently determined, and if it is OFF, it means that the level of the cleaning agent 39 is too low. The empty display section 82 is maintained in a lit state, and when it is ON, it indicates that caution is required, so the empty display section 82 is maintained in a blinking state. Further, when both the level sensor 79 and the upper limit level sensor 78 are outputting ON detection signals, the level of the cleaning agent 39 is too high, and the abnormality display section 83 is maintained in a lit state. As described above, after printing is completed, the movable body 43 is moved by the solenoid 42 to bring the wiping member 44 impregnated with the cleaning agent 39 of the cleaning agent receiver 40 into contact with the blanket cylinder 8, and in this state, the blanket cylinder 8 is rotated. By doing so, the blanket cylinder 8 can be cleaned easily and in a short time.

[0019]

[Effects of the Invention] The invention according to claim 1 provides a blanket cylinder to which an ink image is transferred, a pressing body that is pressed against the blanket cylinder, and a pressing body that is connected to a drive unit and moves toward and away from the outer peripheral surface of the blanket cylinder. A movable body disposed so as to be freely displaceable in a direction, a wiping member held by the movable body and facing the blanket cylinder, and a cleaning agent receiver that holds the cleaning agent in contact with the wiping member. After printing is completed, the movable body is moved by the drive unit to bring the wiping member impregnated with the cleaning agent in the cleaning agent receiver into contact with the blanket cylinder, and in this state, the blanket cylinder is rotated to easily remove the blanket cylinder. , and has the effect of being able to be cleaned in a short time.

[0020] The invention according to claim 2 has the effect that in claim 1, by providing the residual ink amount detecting means in the cleaning agent receiver, the time to replenish ink to the cleaning agent receiver can be known by the remaining ink amount detecting means. has.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a longitudinal cross-sectional side view of the main parts.

FIG. 2 is a perspective view showing the overall structure.

FIG. 3 is a longitudinal side view showing the internal structure.

FIG. 4 is a longitudinal side view showing the operation of the valve mechanism.

FIG. 5 is a longitudinal sectional front view showing a cleaning agent remaining amount detection means.

FIG. 6 is a plan view of the operation panel.

FIG. 7 is a block diagram showing an electronic circuit.

FIG. 8 is a flowchart.

FIG. 9 is a timing chart.

[Explanation of symbols]

8 Blanket cylinder 32 Pressing body 40 Cleaning agent receiver 42 Drive part 43 Movable body 44 Wiping member 70 Cleaning agent remaining amount detection means

Claims (2)

[Claims] Claims: 1. A blanket cylinder to which an ink image is transferred, a pressing member pressed against the blanket cylinder, and a pressing member connected to a drive unit so as to be movable toward and away from the outer peripheral surface of the blanket cylinder. A blanket cylinder cleaning device comprising: a movable body; a wiping member held by the movable body and opposed to the blanket cylinder; and a cleaning agent receiver that holds cleaning agent in contact with the wiping member. . 2. The blanket cylinder cleaning device according to claim 1, wherein the cleaning agent receiver is provided with a remaining ink amount detection means.