JP4319398B2 - Sensor dirt prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sensor antifouling device for preventing a sensor used for detecting printing paper in a printing apparatus, for example.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a foreign matter removing device (dirt prevention device) 130 used in a printing apparatus 100 as shown in FIG. 7 described in Japanese Patent Application Laid-Open No. 2000-280452. First, a printing apparatus will be described. The printing apparatus 100 includes a printing unit 110 that performs printing processing on the printing paper P via a printing drum 111, and a paper supply unit 120 that supplies the printing paper P to the printing unit 110. It has the basic composition which becomes.
[0003]
The paper supply unit 120 is provided with a paper feed table 122 that moves up and down by forward / reverse driving of a drive motor 121, and a bundle of paper P is placed on the paper feed table 122. When the printing process is performed by the printing unit 110, the uppermost printing paper P is passed through the delivery conveyance path 124 by the operation of the paper feeding unit 123 synchronized with the gentle rise of the paper feeding table 122. Are sequentially sent to the printing unit 110.
[0004]
The delivery transport path 124 is provided with a paper sensor 125 made up of a pair of photoelectric elements of a light projecting element and a light receiving element disposed so as to sandwich the delivery transport path 124. The printing paper P passing through the transport path 124 is detected one by one.
[0005]
The foreign matter removing device 130 is used to keep the paper sensor 125 clean by removing foreign matters such as paper dust accumulated on the surface of the paper sensor 125. Is provided. The foreign matter removing device 130 includes a bellows type air pump 131 attached to the lower surface side of the paper feed table 122, an air hose 132 connected to a fixed lower end portion of the air pump 131, and the air hose 132. And an air nozzle 133 provided at the front end portion. The air nozzle 133 is disposed so that the air injection port faces the paper sensor 125.
[0006]
According to such a foreign matter removing device 130, the internal air passes through the air hose 132 due to the contraction of the air pump 131 whenever the uppermost paper feed tray 122 is lowered for the replenishment of the printing paper P. Since the air is ejected and ejected from the air nozzle 133 toward the paper sensor 125, the foreign matter accumulated on the surface of the paper sensor 125 is removed by the air jet flow every time the paper feed table 122 is lowered. The surface of the sensor 125 can be kept clean.
[0007]
[Patent Document 1]
JP 2000-280452 A
[0008]
[Problems to be solved by the invention]
However, in the conventional foreign matter removing apparatus 130 as described above, the paper supply unit 120 must be newly equipped with the foreign matter removing apparatus 130 including the air pump 131 and the like, which increases the equipment cost. Has a point.
[0009]
In addition, the air flow from the air nozzle 133 toward the paper sensor 125 is ejected only when the paper feed table 122 is lowered, and the air flow is supplied to the paper sensor 125 only intermittently. In some cases, the foreign matter removal effect is not sufficient.
[0010]
The present invention has been made to solve the above-described problems, and provides a sensor dirt prevention device that can more reliably prevent sensor dirt while suppressing an increase in equipment cost. The purpose is to do.
[0011]
[Means for Solving the Problems]
The invention according to claim 1 is a sensor anti-smudge device for preventing the detection surface of a predetermined sensor provided in the printing apparatus from being stained, and supplies compressed air for operating various devices of the printing apparatus. Compressed air supply means is provided, and is configured to inject and supply used ones of the compressed air supplied from the compressed air supply means to the device toward the detection surface of the sensor, The compressed air supply means is configured by a compressor, and the various devices are configured to operate by a reciprocating operation of an air cylinder device by the supplied compressed air, and the supply of the compressed air to the sensor is performed as described above. It is configured to be performed by exhaust exhausted from the air cylinder device at the time of forward movement and backward movement in accordance with the operation timing of the air cylinder device, and the sensor has a detection surface in the vicinity of the printing paper conveyance path. An air blower block arranged in a state of being opposed to the printing paper and for supplying compressed air from the compressed air supply means to the detection surface of the sensor and a jet direction of the compressed air from the nozzle portion thereof and the sensor The sensor is arranged on one side of the sensor in a state where a predetermined angle is formed between the sensor and the detection surface. It is characterized by this.
[0012]
According to the present invention, even if the detection surface of the sensor is soiled by dust accumulation, the accumulated dust is blown away by the compressed air supplied from the compressed air supply means being jetted and supplied to the detection surface of the sensor. The detection surface is always clean with the dirt removed. Therefore, the inconvenience that the detection object cannot be detected because the detection surface is dirty is eliminated, and normal operation of the printing apparatus is ensured.
[0013]
And since the compressed air supplied to the sensor is used after being used for operation in various devices of the printing device, a dedicated air supply means is used to prevent the sensor from becoming dirty Compared with the case where it does, it can contribute to the reduction of component cost and assembly cost, and it can achieve the reduction in the manufacturing cost of a printing apparatus, after ensuring prevention of the contamination of a sensor.
[0015]
According to claim 1, Since high-pressure compressed air is supplied from a compressor attached to the printing apparatus for driving various devices, the compressed air from the compressor is suitable for preventing contamination of the sensor.
[0017]
According to claim 1, Each time compressed air is supplied to an air cylinder device for operating various devices included in the printing apparatus, the air cylinder device performs a forward operation or a backward operation. The dirt on the detection surface of the sensor is blown off by the airflow of the compressed air (exhaust gas) discharged from the air cylinder device both during the operation and during the backward operation, thereby cleaning the detection surface.
[0018]
And since the air cylinder device in each place is driven at a predetermined timing during the operation of the printing apparatus, the dust accumulated on the detection surface of the sensor is blown off each time the air cylinder device is driven, and thereby the detection surface of the sensor Can always be kept clean.
[0019]
Claim 2 The described invention is claimed. 1 In the described invention, the air cylinder device is a cylinder-inserted air cylinder used for cylinder-inserting a rubber cylinder which is one of the various devices.
[0020]
In the present invention, the rubber cylinder is disposed so that the peripheral surface of the rubber cylinder is in contact with the peripheral surfaces of both the plate cylinder on which the printed image is imprinted and the impression cylinder on which the printing paper is applied. It is a bracket cylinder, and is used for further transferring the image of the circumferential surface of the rubber cylinder transferred from the plate cylinder onto printing paper that is sandwiched between the rubber cylinder and the impression cylinder and conveyed by the rotation of both. Is.
[0021]
In addition, the barrel insertion of the rubber cylinder is an operation of bringing the rubber cylinder, which is separated from both the plate cylinder and the impression cylinder, into contact with both the plate cylinder and the impression cylinder. Contrary to this, the operation of separating the rubber cylinder in contact with both the plate cylinder and the impression cylinder from both is called cylinder removal. The cylinder insertion is always performed at the beginning of the printing process, and the cylinder removal is always performed at the end of the printing process. In addition, even during the printing process, the printing apparatus may be temporarily stopped to check the printing state. At this time, the cylinder is first removed and a predetermined check is performed. After that, the printing process is resumed.
[0022]
According to the present invention, since the cylinder air cylinder for performing cylinder insertion and cylinder removal of this rubber cylinder is employed as the air cylinder device according to the present invention, the following is described regarding the contamination prevention treatment of the detection surface of the sensor. Special effects can be obtained.
[0023]
First, since the cylinder air cylinder is used to move a rubber cylinder, which is a considerable weight, a cylinder having a larger size than that of other air cylinder devices is employed. Therefore, in order to operate such a cylinder air cylinder, more compressed air is required, and accordingly, a large amount of used compressed air (exhaust gas) for blowing on the detection surface of the sensor, As a result, the detection surface of the sensor can be more reliably cleaned.
[0024]
Then, secondly, in the printing process of one job by the printing apparatus (one unit of printing process continuously performed on a predetermined number of printing papers set in advance on the same plate), the rubber cylinder is printed at the initial stage of printing. Since the cylinder is always carried out, and the rubber cylinder is unrolled when the printing process is completed, the exhaust is surely discharged from the body-filled air cylinder at the time of the cylinder filling and the unloading operation. Therefore, the detection surface of the sensor is always cleaned automatically by exhaust from the cylinder air cylinder at least twice for each printing process of one job. There is no inconvenience that a situation where the injection is not supplied occurs.
[0025]
Thirdly, in general, the printing apparatus is temporarily stopped in order to check the printing state in the middle of the printing process. The operation is performed. In addition, since the job is usually performed several times a day, the cleaning surface of the sensor is cleaned frequently as a whole.
[0026]
As described above, by adopting the barreled air cylinder as the air cylinder device according to the present invention, the amount of exhaust per operation is larger than that of other air cylinder devices due to the large capacity, thereby the sensor. The detection surface of the sensor is better cleaned by exhaust and the cylinder air cylinder is always operated in the printing process of one job. Therefore, the detection surface of the sensor must be cleaned regularly and frequently every day. Thus, it is possible to obtain an excellent effect of being processed.
[0027]
Claim 3 The described invention is claimed. 1 or 2 In the present invention, the sensor is a paper sensor for detecting a printing paper to be subjected to a printing process.
[0028]
According to the present invention, the paper sensor is generally provided in the vicinity of the paper to be subjected to the printing process, and dust (paper powder) generated from the moving paper is accumulated on the detection surface. Although it is easy, when compressed air is supplied to the detection surface of the paper sensor, the detection surface of the paper sensor is always cleaned, and erroneous detection can be reliably prevented.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Prior to the description of the sensor antifouling device according to the present invention, first, an outline of a printing apparatus to which the antifouling device is applied will be described. FIG. 1 is an explanatory view schematically showing an embodiment of a printing apparatus to which a sensor antifouling device according to the present invention is applied.
[0030]
First, as shown in FIG. 1, the printing apparatus 10 includes a paper feeding unit 20 that takes out printing paper P one by one from a paper feeding pile 21 in which a large number of printing papers P are stacked, and the paper feeding unit 20. A print processing unit 30 that performs a printing process on the fed printing paper P, and a paper discharge unit 40 that sends the printed paper P1 formed by the printing processing unit 30 to form a paper discharge pile 43. It has a basic configuration.
[0031]
The paper feed unit 20 holds a feeder board 22 that transports the printing paper P picked up from the top of the paper feeding pile 21 one by one, and the printing paper P transported by the feeder board 22. A swing 23 that moves the print paper P toward the downstream side while swinging around a predetermined axis, and a paper feed cylinder 24 that receives the print paper P and sends it to the print processing unit 30 on the downstream side of the swing 23. Is provided.
[0032]
Positioning needles 22a for positioning the printing paper P on the feeder board 22 by projecting the downstream edge of the printing paper P at an appropriate position at the downstream end of the feeder board 22 protrude, and the swing 23 is By holding the printing paper P positioned by the positioning needle 22a, the holding position with respect to the printing paper P is made constant.
[0033]
The paper feed cylinder 24 is driven to rotate clockwise about an axis extending in a direction perpendicular to the paper surface of FIG. At an appropriate position below the paper feed cylinder 24, there is at least a pair of flat and narrow paper guides 25 (three in this embodiment) formed in an arc shape so as to face the peripheral surface of the paper feed cylinder 24. (Refer to FIG. 5), and the printing paper P fed by the swing 23 is delivered to the printing processing unit 30 after being substantially half-turned while being prevented from hanging by the paper guide 25.
[0034]
The print processing unit 30 includes a pair of plate cylinders 31 on which printing images are engraved on the peripheral surface, and a pair of surfaces arranged in contact with each other at the lower portion corresponding to each plate cylinder 31. 1 and the pair of rubber cylinders 32 in a diagonally upper direction, and the circumferential surface at the lower right position in FIG. 1 faces the circumferential surface of the sheet feeding cylinder 24. The pressure drum 33 is provided.
[0035]
A pair of inkers 34 for supplying ink to the plate cylinder 31 is provided at left and right obliquely upper positions of each plate cylinder 31, and the ink from these inkers 34 rotates counterclockwise around a predetermined axis. The plate cylinder 31 is supplied. Then, the ink transferred from the peripheral surface of the plate cylinder 31 to the peripheral surface of the rubber cylinder 32 by the contact rotation of the peripheral surface is guided by the counterclockwise rotation around the axis of the impression cylinder 33, and the peripheral surface thereof. It is transferred to the co-rotating printing paper P, whereby the printing paper P is subjected to printing processing.
[0036]
The paper discharge unit 40 is disposed at a lower portion of the pressure drum 33 so that a peripheral surface thereof is in contact with the peripheral surface of the pressure drum 33, and a paper discharge drum 41 that rotates clockwise around an axis. And a guide plate 42 disposed so as to cover substantially the lower half of the peripheral surface. The guide plate 42 is dimensioned so that its downstream end faces the position where the paper discharge pile 43 is formed. Accordingly, the printed sheet P1 supplied to the peripheral surface of the discharge cylinder 41 by the rotation of the impression cylinder 33 is guided by the guide plate 42 by the clockwise rotation around the axis of the discharge cylinder 41 and is downstream of the guide plate 42. The paper is sequentially discharged from the end, and a paper discharge pile 43 is formed.
[0037]
Next, various air cylinder devices provided in the printing apparatus 10 will be described with reference to FIG. FIG. 2 is an explanatory diagram for explaining an air cylinder device included in the printing apparatus shown in FIG. 1. As shown in this figure, the printing apparatus 10 is provided with air cylinder devices 50 used at various places for attaching and detaching various attached devices. In the present embodiment, as the air cylinder device 50, the first ink roller separation / contact air cylinder 51, the second ink roller separation / contact air cylinder 52, the first cylinder insertion air cylinder 53, the second cylinder insertion air cylinder 54, the first A plate surface cleaning device attaching / detaching air cylinder 55, a second plate surface cleaning device attaching / detaching air cylinder 56, and an ink cleaner attaching / detaching air cylinder 57 are employed.
[0038]
The first ink roller separation / contact air cylinder 51 contacts and separates one of the unillustrated ink rollers attached to the inker 34 provided in a pair with the plate cylinder 31 with respect to the peripheral surface of the plate cylinder 31. The second ink roller separating / contacting air cylinder 52 is used when contacting and separating the other. Each of the ink rollers is brought into contact with the peripheral surface of the plate cylinder 31 by the forward drive of the first and second ink roller contact / separation air cylinders 51 and 52 (drive in which the piston rod 50c (FIG. 6) protrudes). The contact state is released by driving.
[0039]
The first and second ink roller contact / separation air cylinders 51 and 52 are always positively driven in advance and in contact with the plate cylinder 31 when starting the printing process. When the printing process for one job is completed, the first and second ink roller separation / contact air cylinders 51 and 52 are generally driven in reverse to release the contact state with the plate cylinder 31.
[0040]
The first cylinder insertion air cylinder 53 and the second cylinder insertion air cylinder 54 are used when the ink roller of the rubber cylinder 32 performs the contact / separation operation with respect to the plate cylinder 31 and the impression cylinder 33, and the positive drive thereof. The rubber cylinder 32 comes into contact with both the plate cylinder 31 and the impression cylinder 33 by (the drive by which the piston rod 50c (FIG. 6) protrudes), while the rubber cylinder 32 is separated from the plate cylinder 31 and the impression cylinder 33 by the reverse drive. It has become.
[0041]
Incidentally, the operation of bringing the rubber cylinder 32 in a state of being separated from both the plate cylinder 31 and the impression cylinder 33 into contact with both the plate cylinder 31 and the impression cylinder 33 is referred to as cylinder insertion. The operation of separating the rubber cylinder 32 in contact with both the pressure cylinder 33 and the impression cylinder 33 is referred to as cylinder removal. The cylinder insertion is always performed at the beginning of the printing process in one job, and the cylinder removal is always performed at the end of the printing process in one job.
[0042]
An operation of contacting and separating the rubber cylinder 32 with respect to the plate cylinder 31 and the impression cylinder 33 with two air cylinders (first and second cylinder insertion air cylinders 53 and 54) with respect to one rubber cylinder 32 (body insertion and cylinder removal). The operation is performed in order to stabilize the movement trajectory of the rubber cylinder 32, to ensure a reliable contact state of the rubber cylinder 32 against the impression cylinder 33 by the first cylinder insertion air cylinder 53, and This is to ensure a reliable contact state of the rubber cylinder 32 with respect to the plate cylinder 31 by the two cylinder insertion air cylinder 54.
[0043]
In the printing process of one job, the printing apparatus 10 is generally temporarily stopped to check the printing state on the printing paper P. In such a case, the first and second cylinders are also stopped. The cylinder insertion and cylinder unloading operations are performed by driving the intake air cylinders 53 and 54.
[0044]
The first plate surface cleaning device detachable air cylinder 55 and the second plate surface cleaning device detachable air cylinder 56 are used when the first and second plate surface cleaning devices (not shown) are detachably operated. Thus, the mounting state of the plate surface cleaning apparatus is determined, while the mounting state is released by reverse driving.
[0045]
The ink washer attaching / detaching air cylinder 57 is used for attaching / detaching an ink washer used for washing an unillustrated ink roller, and the positive state of the ink washer is fixed. On the other hand, the mounted state is released by reverse driving.
[0046]
The compressed air from the compressor 60 is switched and supplied to each air cylinder device 50 through a predetermined compressed air pipe 61 via the electromagnetic valve 70. Then, any one of the air cylinder devices 50 supplied with the compressed air performs a preset operation by the driving thereof, whereby the plate cylinder 31, the rubber cylinder 32, the impression cylinder 33, etc. can be attached / detached and maintained. Be able to do.
[0047]
Incidentally, in FIG. 2, the piping system of the compressed air piping 61 is shown in a simplified manner in order to avoid the illustration being complicated, but actually, a dedicated piping is adopted for each air cylinder device 50, The compressed air is supplied toward the air cylinder device 50 set by the switching operation of the valve 70.
[0048]
The sensor antifouling device according to the present invention is applied to the printing apparatus 10 configured as described above. Hereinafter, the contamination preventing apparatus will be described with reference to FIG. 3 and, if necessary, to FIG. 1 and FIG. FIG. 3 is a diagram showing the main part of FIG. 1 (portion where the antifouling device 80 and the paper sensor 90 are provided), and shows an enlarged view of the diagram inside the small circle inside the large circle.
[0049]
The anti-smudge device 80 is for removing dust, mainly paper dust, deposited on the detection surface of the paper sensor 90 to remove the dirt and clean the detection surface. The compressor (compressed air supply means) 60 for supplying compressed air for use, and the compressed air supplied from the compressor 60 for operating the equipment is injected toward the detection surface of the sensor. And an air blower block 81 to be supplied.
[0050]
Prior to detailed description of the anti-smudge device 80, the paper sensor 90 will be described first. In the present embodiment, the paper sensor 90 is provided with a so-called optical sensor having a light emitting element and a light receiving element. The paper sensor 90 detects the presence of the printing paper P by irradiating the light from the light emitting element toward the printing paper P being conveyed and inputting the reflected light to the light receiving element. (Displayed with a one-dot chain line in FIG. 4A). When the printing paper P does not exist, the reflected light is not input to the light receiving element, thereby detecting that the printing paper P is not present. The paper sensor 90 is configured such that the light emitting element emits light when a control signal synchronized with the conveyance timing of the printing paper P is input.
[0051]
Such a paper sensor 90 is arranged in the vicinity of the transport path of the printing paper P with the detection surface 91 facing the printing paper P. In the present embodiment, as shown in FIG. 3, as the paper sensor 90, the paper feed cylinder side sensor 90 a for detecting the printing paper P being conveyed by the paper feed cylinder 24 and the paper discharge cylinder 41 are being conveyed. A paper discharge drum side sensor 90b for detecting the printing paper P is employed.
[0052]
When the paper feed cylinder side sensor 90a or the paper discharge cylinder side sensor 90b does not detect the presence of the printing paper P, the driving of the printing apparatus 10 is stopped based on the signal, and the first cylinder charging air is detected. The cylinder 53 and the second cylinder-injecting air cylinder 54 are driven in reverse, whereby the rubber cylinder 32 is removed. In this state, processing such as removal of the jammed printing paper P is performed, and the inappropriateness of paper conveyance is resolved.
[0053]
FIG. 4 is a perspective view conceptually showing an embodiment of an air blower block 81 which is one of the components of the antifouling device 80 according to the present invention. The figure seen from the opposite side of the facing side) and (b) is the figure seen from the front side (side facing the printing paper P). This perspective view shows the positional relationship between the air blower block 81 and the paper sensor 90 so that it can be easily recognized visually, and is drawn in a simplified manner.
[0054]
As shown in FIG. 4, the air blower block 81 includes a block main body 82 and a bend pipe 83 connected to the block main body 82. In this embodiment, the block body 82 is formed in a rectangular parallelepiped shape, and has an air passage 84 formed in an L shape therein. The air passage 84 is pierced in an L shape from one end face of the block main body 82 to one side face, and a nozzle portion 85 for ejecting compressed air is formed at the tip position on the side face side.
[0055]
One end of the bend pipe 83 is screwed and fastened to an opening on the end face side of the block main body 82 (an inlet portion of the air passage 84), and an electromagnetic valve is connected to the other end of the block main body 82. A compressed air pipe 61 (specifically, a paper feed side pipe 77a or a paper discharge side pipe 77b, which will be described in detail later with reference to FIG. 6), which is a passage for the compressed air sent from the compressor 60 via 70, is connected. Yes. Therefore, when compressed air from the compressor 60 is supplied to the air passage 84 of the air blower block 81 by a predetermined switching operation of the electromagnetic valve 70, the compressed air is ejected from the nozzle portion 85 as a jet. .
[0056]
In the present embodiment, the paper sensor 90 is housed in a slightly flat rectangular parallelepiped casing 92. A detection surface 91 is formed on one side surface of the casing 92. The casing 92 is disposed so as to be parallel to the conveyance path of the printing paper P to be detected by the detection surface 91 of the paper sensor 90 with a predetermined interval. Accordingly, the paper sensor 90 is configured so that the light output from the light emitting element is reflected to the light receiving element in the state where the printing paper P is present in the transport path, as indicated by the alternate long and short dash line in FIG. While the presence of the printing paper P is detected by the input, the absence of the printing paper P detects the absence of the printing paper P because the reflected light is not input to the light receiving element.
[0057]
In the present embodiment, the block main body 82 is such that the jet direction of the compressed air from the nozzle portion 85 is inclined approximately 5 ° with respect to the detection surface 91 of the paper sensor 90 and most of the jet flow is the detection surface 91. The relative installation position is set with respect to the paper sensor 90 so as to be supplied toward the paper. Therefore, when compressed air is jetted from the nozzle portion 85 of the block main body 82, dirt such as paper dust attached to the detection surface 91 of the paper sensor 90 is blown off by the jet flow, and thereby the detection surface 91 becomes dirty. Will be prevented.
[0058]
In this embodiment, as shown in FIG. 3, the air blower block 81 corresponds to the paper feed side block 81a corresponding to the paper feed side sensor 90a and the paper discharge side sensor 90b. A paper discharge side block 81b is employed.
[0059]
FIG. 5 is an explanatory diagram in plan view for explaining the installation positions of the air blower block 81 and the paper sensor 90 as described above. In FIG. 5, as the air blower block 81 and the paper sensor 90, the paper feed side block 81a and the paper feed cylinder side sensor 90a are shown as an example. The situation is the same.
[0060]
As shown in FIG. 5, the paper feed side block 81 a and the paper feed cylinder side sensor 90 a are supported by a construction rod F <b> 1 constructed between the frames F on both sides in the width direction of the printing apparatus 10. The erection rod F1 is set so as to be positioned obliquely below the paper feed cylinder 24 (see FIG. 1). The impression cylinder 33 is present immediately above, and the paper ejection cylinder is located forward (below the paper surface in FIG. 5). 41, the paper feed cylinder side sensor 90a supported by the erection rod F1 in a state surrounded by these is easily cleaned by inserting a hand even if the detection surface 91 is contaminated with paper dust or the like. Difficult to do.
[0061]
Normally, one of the frames F (the right frame F in FIG. 5; this frame F side is the front side of the printing apparatus 10) covers the outer surface side of the frame F to improve the appearance. However, a cover door C1 is provided on the front side of the cover C (on the right side of the sheet of FIG. 5), and the frame F on the right side has a frame at a position corresponding to the cover door C1. A hole C2 is formed. In the case where the antifouling device 80 of the present invention is not provided, when cleaning the detection surface 91 of the paper feed cylinder side sensor 90a, the cover door C1 is opened and the arm is inserted into the cover C, and the frame is further removed. The detection surface 91 is wiped with a cloth or the like by inserting a hand between the pair of frames F from the hole C2.
[0062]
However, such work is very troublesome and inferior in workability. However, by using the antifouling device 80 according to the present invention, it is possible to perform the supply without performing the inefficient work as described above. The cleaning process of the detection surface 91 can be performed easily and reliably by the jet supply of compressed air from the paper side block 81a toward the detection surface 91.
[0063]
Next, the supply of compressed air from the compressor 60 to the air blower block 81 via the electromagnetic valve 70 will be specifically described with reference to FIG. 6 and, if necessary, to FIGS. FIG. 6 is a plan view showing an embodiment of an electromagnetic valve. FIG. 6A shows an electromagnetic valve 70 applied to the antifouling device 80 in combination with the air cylinder device 50, and FIG. The electromagnetic valve 70a which is shown in order to make the characteristics of the electromagnetic valve 70 according to the present invention stand out in comparison with the electromagnetic valve 70 according to the present invention is not used in combination with the antifouling device 80.
[0064]
First, the electromagnetic valve 70 according to the present invention shown in FIG. 6A is a so-called quadruple type in which four unit electromagnetic valves 71 are connected in series in this embodiment. Each unit electromagnetic valve 71 is provided with a piston-like port valve (not shown), and the fluid flow path is switched in the unit electromagnetic valve 71 by forward and reverse movement of the port valve. This switching operation is performed by inputting a control signal through the signal line 79 to a solenoid (not shown) in each unit electromagnetic valve 71.
[0065]
The compressed air A <b> 1 from the compressor 60 is always supplied to the electromagnetic valve 70 via the receiving pipe 72. The compressed air A1 supplied to the electromagnetic valve 70 is distributed to each unit electromagnetic valve 71 according to the open / close state of the port valve. In each unit electromagnetic valve 71, a first pipe 73 that sends out compressed air A1, a second pipe 74 through which used air (exhaust gas) A2 after the compressed air performs a predetermined work in the air cylinder device 50, and Are connected to each other.
[0066]
In FIG. 6A, since the first pipe 73 and the second pipe 74 overlap each other and appear as one, the part number “73” indicating the delivery pipe is attached to the solid line indicating the compressed air A1. The part number “74” indicating the used air pipe is attached to the dotted line of the used air A2. In the description based on (a) of FIG. 6, the direction through which the compressed air A1 passes is referred to as the first pipe 73, and the direction through which the used air A2 passes is referred to as the second pipe 74, but the first pipe 73 and the second pipe. 74, the used air A2 and the compressed air A1 can also pass through each other by switching the flow path in the unit electromagnetic valve 71.
[0067]
The spent air A2 returned to each unit electromagnetic valve 71 via the air cylinder device 50 is collected in the collective discharge pipe 75 and then distributed by a distributor 76 provided at the downstream end of the collective exhaust pipe 75. One is supplied to the paper feed side block 81a through the paper feed side pipe 77a, and the other is supplied to the paper discharge side block 81b through the paper discharge side pipe 77b. Yes.
[0068]
The air cylinder device 50 (in FIG. 6 (a), the first ink roller separation / contact air cylinder 51 is cited as a representative example) includes an air cylinder 50a and an interior that can be moved forward and backward in the air cylinder 50a. The piston 50b is configured. The air cylinder 50a is provided with a first opening 50d opened at the left end position in FIG. 6 and a second opening 50e opened at the right end position, via the first and second openings 50d and 50e. The compressed air A1 and the used air A2 enter and exit the air cylinder 50a.
[0069]
A piston rod 50c extending along the axial center is attached to the piston 50b, and a predetermined device (first ink shown in FIG. 6A) is obtained by forward / reverse movement of the piston rod 50c accompanying forward / reverse movement of the piston 50b. In the case of the roller separation / contact air cylinder 51, the first ink roller) performs a predetermined operation.
[0070]
In the example shown in FIG. 6 (a), the compressed air A1 from the compressor 60 is received by the receiving pipe 72, the uppermost unit electromagnetic valve 71, the first pipe 73, and the air cylinder 50a of FIG. The state is introduced into the air cylinder 50a through the one opening 50d, whereby the piston 50b is moving rightward.
[0071]
In this state, the used air A2 located on the right side of the piston 50b in the air cylinder 50a is returned to the unit electromagnetic valve 71 via the second opening 50e and the second pipe 74 of the air cylinder 50a, and then gathered. One of the used air A2 is supplied to the paper feed side block 81a through the discharge pipe 75 and the distributor 76, and the other of the used air A2 passes through the paper discharge side pipe 77b. Thus, the paper is supplied to the paper discharge side block 81b.
[0072]
The used air A2 supplied to the paper feed side block 81a is jetted from the nozzle portion 85 toward the detection surface 91 of the paper feed cylinder side sensor 90a, and the used air supplied to the paper discharge side block 81b. As described above, the air A2 is similarly jetted toward the detection surface 91 of the paper discharge drum side sensor 90b, and the detection surfaces 91 are thereby cleaned.
[0073]
Next, when a predetermined control signal (a control signal for moving the piston 50b once moved to the right in FIG. 6A) to the left is input to the electromagnetic valve 70 via the signal line 79, ( The port valve of the uppermost unit electromagnetic valve 71 on the paper surface of (a) is switched, and the compressed air A1 from the compressor 60 is introduced into the air cylinder 50a through the second pipe 74 and the second opening 50e, contrary to the above. At the same time, the used air from the air cylinder 50a is led out through the first pipe 73, and the sheet feeding side block 81a and the sheet discharging side block 81b are passed through the unit solenoid valve 71, the collective discharge pipe 75 and the distributor 76. To be supplied.
[0074]
This means that when the air cylinder device 50 obtains the compressed air A1 from the compressor 60 and performs a predetermined operation, the piston 50b is present in the air cylinder 50a regardless of whether it is forward or backward. It shows that the used air A2 is supplied to the air blower block 81, and the detection surface 91 of the paper sensor 90 is cleaned by the supply of the used air A2 from the air blower block 81.
[0075]
As described above, the air cylinder device 50 such as the first ink roller separation / contact air cylinder 51 and the second ink roller separation / contact air cylinder 52 is driven a plurality of times per day in the single printing device 10. Therefore, the used air A2 is jetted and supplied to the detection surface 91 of the paper sensor 90 a plurality of times per day by the reciprocation of the piston 50b, and the detection surface 91 is always cleaned and reliably contaminated. Will be prevented.
[0076]
On the other hand, in the electromagnetic valve 70a to which the antifouling device 80 of the present invention is not applied, as shown in FIG. 6B, a silencer for eliminating abnormal noise at the tip of the collective discharge pipe 75. 78 is only attached, and the used air is discharged outside the system through the collective exhaust pipe 75 and the silencer 78 and is not used effectively.
[0077]
As described in detail above, the anti-smudge device 80 of the present embodiment prevents the detection surface 91 of the paper sensor 90 provided in the printing device 10 from being dirty. 2 ink roller separation / contact air cylinders 51, 52, first and second cylinder loading air cylinders 53, 54, first and second plate surface cleaning device attachment / detachment air cylinders 55, 56, ink washer attachment / detachment air cylinder 57, etc. Among the compressed air A1 supplied to each device from the compressor 60 provided for operating various devices attached to the printing apparatus 10, the used one is directed toward the detection surface 91 of the paper sensor 90. Since it is configured to be supplied by jetting, even if the detection surface 91 of the paper sensor 90 is soiled due to accumulation of paper dust or the like, the compressed air A1 from the compressor 60 is detected by the paper sensor. Dirt such as paper dust deposited by the detection surface 91 to be injected and supplied from 0 is blown off, which makes it possible to always clean state dirt is removed detection surface 91 of the paper sensor 90. Therefore, the inconvenience that the detection object cannot be detected due to the detection surface 91 being dirty is solved, and the normal operation of the printing apparatus can be ensured.
[0078]
The compressed air A <b> 1 supplied to the paper sensor 90 is used after being used for operation in various devices of the printing apparatus 10, and is used exclusively for preventing the paper sensor 90 from being stained. Compared to the case where the air supply means is employed, it is possible to contribute to the reduction of parts cost and assembly cost, and it is possible to ensure the prevention of dirt of the paper sensor 90 and to reduce the manufacturing cost of the printing apparatus 10. Can be achieved.
[0079]
Moreover, since the compressor 60 set as an accessory device of the printing apparatus 10 is adopted as the compressed air supply means, it is not necessary to separately employ a dedicated compressed air learning means, thereby contributing to a reduction in equipment cost. In addition, since the high-pressure compressed air A1 is supplied from the compressor, the compressed air A1 from the compressor can be used very suitably for preventing the paper sensor 90 from being stained.
[0080]
Further, various devices according to the present invention (the ink roller of the inker 34, the plate cylinder 31, the rubber cylinder 32, the pressure cylinder 33, etc.) perform predetermined operations by the reciprocating operation of the air cylinder device 50 by the compressed air A1. In addition, the supply of the compressed air A1 to the paper sensor 90 is performed by the used air A2 discharged from the air cylinder device 50 during forward movement and backward movement. Each time the compressed air A1 is supplied to the air cylinder device 50 for operating the device, the device performs a predetermined operation by the forward operation and the backward operation of the air cylinder device 50, and is discharged by both the forward operation and the backward operation. The detection surface 91 of the paper sensor 90 is blown away by the air flow of the compressed air A1 that is blown, and the detection surface 91 is thereby cleaned.
[0081]
And since the air cylinder device 50 in each place is driven at a predetermined timing when the printing apparatus 10 is operated, the dust accumulated on the detection surface 91 of the paper sensor 90 is blown each time the air cylinder device 50 is driven, As a result, the detection surface 91 of the paper sensor 90 can always be maintained in a cleaned state.
[0082]
In addition, a paper sensor 90 for detecting the printing paper P that is moving and used for the printing process is applied as a sensor according to the present invention, and the paper sensor 90 is in the vicinity of the paper used for the printing process. Generally, it is provided. Therefore, although dust (paper dust) generated from the moving printing paper P is likely to accumulate on the detection surface 91, the compressed air A1 is supplied to the detection surface 91 of the paper sensor 90, In the paper sensor 90, the detection surface 91 that is easily contaminated is always cleaned, and erroneous detection can be reliably prevented.
[0083]
Further, the first and second cylinder air cylinders 53 and 54 are employed as one of the devices that generate the used air A2, but the first and second cylinder air cylinders 53 and 54 have a considerable weight. It is used to move the rubber barrel 32, which is a thing, and has a larger size than other air cylinder devices. Accordingly, in order to operate the first and second cylinder air cylinders 53 and 54, more compressed air is required, and therefore used air for blowing on the detection surface of the paper sensor 90 according to this. A2 also becomes a large amount, and thereby the detection surface of the paper sensor 90 can be more reliably cleaned.
[0084]
Further, in the printing process of one job by the printing apparatus 10 (one unit of printing process continuously performed for a predetermined number of printing sheets P set in advance on the same plate), the rubber cylinder 32 is printed at the initial stage of printing. Since the barreling is always performed, and the drumming process of the rubber cylinder 32 is always performed when the printing process is completed, the first and second barreling air cylinders 53 and 54 are always used during the barreling and the barreling operation. Air A2 is discharged.
[0085]
Accordingly, the detection surface of the paper sensor 90 is automatically cleaned by discharging the used air A2 from the first and second cylinder air cylinders 53 and 54 that is always performed twice in the printing process of one job. Therefore, there is no inconvenience that the used air A2 is not jetted and supplied to the detection surface of the paper sensor 90 for a long time.
[0086]
Further, it is common to temporarily stop the printing apparatus 10 in order to check the printing state in the middle of the printing process, but such a temporary stop is usually performed a plurality of times (usually 2 to 3 times) per job. Generally done. Then, every time the printing apparatus 10 is temporarily stopped, the cylinder cylinder 32 is removed and the cylinder insertion operation is performed. Therefore, the first and second cylinder insertion air cylinders 53 and 54 are driven forward and reverse during these operations. Thus, the detection process of the detection surface of the paper sensor 90 by the used air A2 is performed.
[0087]
And since the air blower block 81 is being fixed in the state which formed the predetermined angle (for example, about 5 degrees) between the injection direction of the compressed air A1 and the detection surface 91 of the paper sensor 90, for example, the detection surface 91 When the compressed air A1 is blown onto the detection surface 91 from the direction orthogonal to the sheet surface, the sheet sensor 90 interferes with the air blower block 81 and cannot detect the printing sheet P. The compressed air A1 can be effectively blown onto the detection surface 91 of the paper sensor 90.
[0088]
Further, by forming a predetermined angle between the jet direction of the compressed air A1 and the detection surface 91 of the paper sensor 90, the jet direction of the compressed air A1 is parallel to the detection surface 91 of the paper sensor 90. It is possible to spray most of the jet flow ejected from the jet nozzle directly onto the detection surface 91 more efficiently than in the case of [°], thereby obtaining a more reliable stain removal effect on the detection surface 91 of the paper sensor 90.
[0089]
The present invention is not limited to the above embodiment, and includes the following contents.
[0090]
(1) In the above embodiment, the used air A2 (the air pushed out by the movement of the piston 50b) in the compressed air supplied from the compressor 60 to the air cylinder device 50 as exhaust is employed. Such spent air A2 is naturally included in the concept of “used air in compressed air supplied from the compressed air supply means to the device” according to the present invention. The compressed air that is discarded without driving the device is also included in the concept of “used compressed air supplied from the compressed air supply means to the device”.
[0091]
Specifically, in the high-pressure piping system, the emergency valve opens when the pressure rises above the upper limit value in order to prevent the pressure in the piping system from rising above the preset upper limit value and to ensure safety. Although it is a well-known matter that a so-called discharge valve configured as described above is employed, the discharge gas discharged from the discharge valve may be blown onto the detection surface 91 of the paper sensor 90. A contamination preventing device using such a discharge valve is also included in the technical scope of the present invention.
[0092]
(2) In the above embodiment, the compressor 60 is employed as the compressed air supply means. However, the present invention is not limited to the compressed air supply means being the compressor 60, and various types of compressed air. Supply means can be employed. For example, when there is a storage device for liquid air in the vicinity of the printing apparatus 10, high-pressure air formed by vaporizing the liquid air is used for cleaning the detection surface 91 of the paper sensor 90. Can do. Further, not only liquid air but also an apparatus that generates high-pressure air in the vicinity of the printing apparatus 10, the compressed air may be branched from the apparatus and used.
[0093]
(3) In the above embodiment, the paper sensor 90 is employed as the sensor according to the present invention. However, the present invention is not limited to the paper sensor 90, and the detection surface is clean. The anti-smudge device 80 according to the present invention can be applied to prevent various types of sensors that should be kept in the normal state and prevent the detection surface from being dirty.
[0094]
【The invention's effect】
According to the dirt preventive device for a sensor according to the present invention, a used one of the compressed air supplied to the device from the compressed air supply means for supplying the compressed air for the operation of various devices of the printing device. Since the sensor is sprayed and supplied toward the detection surface, even if the sensor detection surface is contaminated with dust accumulation, the compressed air from the compressed air supply means is jetted and supplied to the sensor detection surface. Accumulated dust is blown off, so that the detection surface of the sensor can always be in a clean state from which dirt is removed. Therefore, the inconvenience that the detection object cannot be detected because the detection surface is dirty is solved, and the normal operation of the printing apparatus can be effectively ensured.
[0095]
And since the compressed air supplied to the sensor is used after being used for operation in various devices of the printing device, a dedicated air supply means is used to prevent the sensor from becoming dirty Compared to the case, it is possible to contribute to the reduction of the component cost and the assembly cost, and it is possible to achieve the reduction in the manufacturing cost of the printing apparatus while ensuring the prevention of contamination of the sensor.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing an embodiment of a printing apparatus to which a sensor antifouling device according to the present invention is applied.
FIG. 2 is an explanatory diagram for explaining an air cylinder device included in the printing apparatus shown in FIG. 1;
FIG. 3 is a diagram illustrating a main part (a portion where a stain prevention device and a paper sensor are provided) of FIG. 1, and an enlarged view of a diagram in a small circle within a large circle.
FIG. 4 is a perspective view conceptually showing an embodiment of an air blower block which is one of the constituent elements of the antifouling device according to the present invention, wherein (a) is the back side (the side facing the printing paper) (B) is a view as seen from the front side (side facing the printing paper).
FIG. 5 is an explanatory diagram in plan view for explaining the installation positions of the air blower block and the paper sensor.
FIG. 6 is a plan view showing an embodiment of a solenoid valve, where (a) shows a solenoid valve applied to a dirt prevention device in combination with an air cylinder device, and (b) shows (b) of FIG. The electromagnetic valve which is shown in order to make the characteristics of the electromagnetic valve according to the present invention stand out in comparison with the electromagnetic valve according to the present invention is not used in combination with the antifouling device.
FIG. 7 is an explanatory diagram for explaining a conventional antifouling device.
[Explanation of symbols]
10 Printing device 20 Paper feed unit
21 Feeding pile 22 Feeder board
22a Positioning needle 23 Swing
24 Paper feed cylinder 25 Paper guide
30 Print processing section 31 Plate cylinder
32 Rubber cylinder 33 Impression cylinder
34 Inker 40 Paper discharge section
41 Paper discharge cylinder 42 Guide plate
43 Paper discharge pile 50 Air cylinder device
50a Air cylinder 50b Piston
50c Piston rod 50d First opening
50e 2nd opening
51 First ink roller separation / contact air cylinder
52 Second ink roller separation / contact air cylinder
53 1st cylinder air cylinder
54 Second cylinder air cylinder
55 First Cylinder Cleaning Device Removable Air Cylinder
56 2nd plate surface cleaning device detachable air cylinder
57 Ink cleaner removable air cylinder
60 Compressor 61 Compressed air piping
70, 70a Solenoid valve 71 Unit solenoid valve
72 receiving pipe 73 first piping
74 Second piping 75 Collecting discharge pipe
76 Distributor 77a Feeding side piping
77b Outlet piping 78 Silencer
79 Signal line 80 Dirt prevention device
81 Air blower block 81a Paper feed side block
81b Paper discharge side block 82 Block body
83 Bend pipe 84 Air passage
85 Nozzle part 90 Paper sensor
90a Paper feed cylinder side sensor 90b Paper discharge cylinder side sensor
91 Detection surface 92 Casing
A1 Compressed air A2 Used air
C cover C1 cover door
C2 Frame hole F Frame
F1 Construction rod P Printing paper
P1 printed paper

Claims (3)

A sensor dirt prevention device for preventing dirt on a detection surface of a predetermined sensor provided in a printing apparatus, comprising compressed air supply means for supplying compressed air for operation of various devices included in the printing apparatus. The compressed air supplied from the compressed air supply means to the equipment is configured to inject and supply used air toward the detection surface of the sensor, and the compressed air supply means is configured by a compressor. The various devices are configured to be operated by a reciprocating operation of the air cylinder device by the supplied compressed air, and the supply of the compressed air to the sensor is forwarded in accordance with the operation timing of the air cylinder device. It is configured to be performed by exhaust gas discharged from the air cylinder device at the time of return and return movement, and the sensor is arranged in the vicinity of the printing paper conveyance path Compressed air is ejected from the nozzle portion of an air blower block that is arranged with its detection surface facing the printing paper and that supplies compressed air from the compressed air supply means to the detection surface of the sensor. A sensor antifouling device , wherein the sensor is disposed on one side of the sensor in a state where a predetermined angle is formed between the direction and a detection surface of the sensor. The sensor air pollution preventing device according to claim 1, wherein the air cylinder device is a cylinder air cylinder used to encase a rubber cylinder which is one of the various devices. The sensor contamination prevention apparatus according to claim 1, wherein the sensor is a paper sensor for detecting a printing paper to be subjected to a printing process.

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