JPH07227961A - Offset press fitted with damping water amount detection mechanism and damping water amount detector - Google Patents

Abstract

PURPOSE:To provide a damping water amt. detector good in workability and capable of easily altering a detection point. CONSTITUTION:A slide bar 111 is fixed to an opening and closing type safety cover 25 and a bracket 127 is attached to the slide bar 111 in a freely slidable manner and a damping water amt. detector 20 is attached to the bracket 12. The maintenance and inspection of a plate surface can be easily performed only by opening the cover 25 before the start of printing and the cover 25 is positioned by a positioning pin 30. Therefore, the distance d2 between the damping water amt. detector 20 and the plate surface is also accurately kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing apparatus having a dampening water amount detecting mechanism, and more particularly to a method of mounting a dampening water amount detector.

[0002]

2. Description of the Related Art In an offset printing apparatus, an operator determines the amount of dampening water to be applied to a plate while checking the printing surface so that high quality printed matter can be obtained. Need to hold. Therefore, the offset printing apparatus requires a dampening water amount detector that detects the film thickness of water on the printing plate. In this dampening water amount detector, in order to accurately detect the dampening water amount, it is necessary to keep the distance between the dampening water amount detector and the plate surface at a predetermined distance.

On the other hand, in detecting the amount of dampening water, a non-image area where ink does not adhere is selected as a detection point for detecting the amount of dampening water. The position of this non-image area changes depending on the plate to be set.

As described above, the slide bar set parallel to the plate cylinder is arranged so that the dampening water amount can be detected regardless of the position of the detection point of the plate, while maintaining the accurate distance from the plate surface. There is known a dampening water amount detecting device which is provided and is configured to move the dampening water amount detector along the slide bar.

[0005]

However, the dampening water amount detecting device has the following problems.

Since the slide bar is fixed to the plate cylinder, during cleaning such as cleaning of the ink roller, mounting and dismounting of the plate on the plate cylinder, or maintenance such as mounting and dismounting of the ink foam roller, The slide bar gets in the way.

The present invention solves the above problems and can accurately detect the amount of dampening water regardless of the position of the detection point while maintaining the distance from the plate accurately. It is an object of the present invention to provide a dampening water amount detection device in an offset printing device having good workability.

[0008]

According to another aspect of the present invention, there is provided an offset printing apparatus with a dampening water amount detection mechanism, wherein the offset printing apparatus has a plate cylinder, a printing mechanism section, a safety cover for opening and closing the printing mechanism section, Holding means for holding the safety cover in a predetermined position with respect to the plate cylinder when the safety cover is closed; and a slide bar fixed to the safety cover, wherein the plate cylinder is provided when the safety cover is closed. The slide bar provided so as to be parallel to the axis of, the plate held by the plate cylinder, irradiates light,
Receiving the light reflected by the plate, based on the received light amount, a dampening water amount detector for detecting the dampening water amount, a dampening water amount detector movably provided along the slide bar, It is characterized by having.

According to another aspect of the present invention, there is provided an offset printing apparatus with a dampening water amount detecting mechanism, which has connection cord housing means for housing a connection cord of the dampening water amount detector, and the connection cord is in the connection cord housing means. , It is characterized by being stored in a retractable shape.

According to a third aspect of the present invention, there is provided a dampening water amount detector mounting method, wherein the printing mechanism is covered with a safety cover that can be freely opened and closed, and when the safety cover is closed, the dampening water amount detector is mounted on the plate cylinder shaft. On the other hand, the dampening water amount detector is attached to the safety cover so that it can be moved in parallel and is held at a predetermined position with respect to the plate cylinder.

In the jig of claim 4, the tip of the dampening water amount detector is inserted, and the main body has a bottom surface portion with which at least a part of the tip end abuts, and the main body has a bottom surface portion opposite to the bottom surface portion. An abutting portion provided in a protruding manner, which abuts on the plate surface and maintains a distance between the bottom surface portion and the plate surface at a predetermined distance, and the dampening water amount detector is located at the axial center of the plate cylinder. A contact portion that is oriented at a predetermined angle with respect to.

In the dampening water amount detecting device in the offset printing device according to the fifth aspect, when the irradiation start signal is received,
For the plate held on the plate cylinder, irradiating light, receiving the light reflected by the plate, based on the amount of light received, a dampening water amount detector for detecting the amount of dampening water, the plate cylinder Irradiation candidate position determining means for inputting the held non-image area of the plate as an irradiation candidate position, rotation driving means for rotationally driving the plate cylinder in response to a rotation driving signal, and irradiation formed by the dampening water amount detector. A correction data storage unit that stores a positional deviation between a surface and the irradiation candidate position as correction data, and based on the correction data, irradiation is performed at the irradiation candidate position for each rotation cycle of the plate cylinder. An irradiation start signal output means for outputting an irradiation start signal to the dampening water amount detector is provided.

In the method for detecting the amount of dampening water in the offset printing apparatus according to the sixth aspect, an irradiation candidate position which is deviated from the detection position of the dampening water amount detector by a predetermined rotation angle with respect to the rotation direction of the plate cylinder is determined. Then, based on the rotation deviation angle,
The amount of dampening water is detected at the irradiation candidate position while rotating the plate cylinder.

[0014]

In the offset printing apparatus with the dampening water amount detecting mechanism according to claim 1, the safety cover is held at a predetermined position with respect to the plate cylinder by the holding means when the openable safety cover is closed. To be done. The slide bar is fixed to the safety cover, and the slide bar is parallel to the axis of the plate cylinder when the safety cover is closed. The dampening water amount detector is provided movably along the slide bar. Therefore, when the safety cover is closed, the dampening water amount detector is
The dampening water amount detector is held at a predetermined position and is movable in parallel with the axis of the plate cylinder. Further, when the safety cover is opened, the dampening water amount detector separates from the printing mechanism unit together with the safety cover. As a result, the slide bar does not interfere with maintenance work.

In the offset printing apparatus with the dampening water amount detecting mechanism according to the second aspect, the connection cord is accommodated in the connection cord storage means in a stretchable shape. Therefore, when the dampening water amount detector is moved, the dampening water amount detector can be moved smoothly without the connection cord being entangled.

In the method of mounting the dampening water amount detector according to the third aspect, the printing mechanism is covered with a safety cover that can be opened and closed. When the safety cover is closed, the dampening water amount detector is movable in parallel with the axis of the plate cylinder, and is kept in a predetermined position with respect to the plate cylinder. A water flow detector can be attached to the safety cover. Therefore, when the safety cover is closed, the dampening water amount detector is held at a predetermined position and is movable parallel to the axis of the plate cylinder. Further, when the safety cover is opened, the dampening water amount detector separates from the printing mechanism unit together with the safety cover. This facilitates the work of the printing mechanism.

In the jig of claim 4, the main body is
The dampening water amount detector has a bottom portion into which a tip is inserted and at least a part of the tip abuts. Further, the abutting portion is provided so as to project on a side opposite to the bottom surface portion of the main body, abuts on the plate surface, and keeps a distance between the bottom surface portion and the plate surface at a predetermined distance. , Orient the dampening water amount detector at a predetermined angle with respect to the axial center of the plate cylinder. Therefore, by merely bringing the tip of the dampening water amount detector into contact with the bottom surface portion, while keeping the distance between the tip of the dampening water amount detector and the plate surface at a predetermined distance, the dampening water amount detector is It can be oriented at a predetermined angle with respect to the axis center of the plate cylinder.

In the dampening water amount detecting device of the offset printing apparatus according to the present invention, the rotation driving means drives the plate cylinder to rotate when receiving the rotation driving signal. When the irradiation candidate position is input by the irradiation candidate position determination means, the correction data irradiation start signal output means outputs the correction data irradiation start signal output means for each rotation cycle of the plate cylinder based on the correction data stored in the correction data storage means. In order to irradiate the irradiation candidate position, to the dampening water amount detector,
An irradiation start signal is output. Upon receiving this irradiation start signal,
The dampening water amount detector detects the dampening water amount. Therefore, the irradiation candidate position determining means can perform detection at this irradiation candidate position only by inputting the non-image area portion as the irradiation candidate position.

In the method for detecting the amount of dampening water in the offset printing apparatus according to the sixth aspect, an irradiation candidate position which is deviated from the detection position of the dampening water amount detector by a predetermined rotation angle with respect to the rotation direction of the plate cylinder is determined. Then, based on the rotation deviation angle,
The amount of dampening water is detected at the irradiation candidate position while rotating the plate cylinder. Therefore, the detection position may be determined at an irradiation candidate position that is deviated from the detection position of the dampening water amount detector by a predetermined rotation angle, and thus the irradiation candidate position can be easily determined.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The attachment of the dampening water amount detector 20 to the offset printing apparatus will be described with reference to FIG. As shown in Figure 1,
The dampening water amount detector 20 is attached to an openable cover 25. Therefore, the maintenance inspection of the plate surface 13 can be easily performed only by opening the cover 25 before the start of printing.
The cover 25 is positioned by the positioning pin 30.
Therefore, the distance d between the dampening water amount detector 20 and the plate 13
2 can be held accurately.

The dampening water amount detector 20 is attached to a slider 24 as shown in FIG. The slider 24 is movable in the direction of arrow 26 along the support rods 11a and 11b. That is, by rotating the plate cylinder 5 or moving the slider 24, the amount of dampening water in any part of the plate surface 13 can be detected.

In this embodiment, the positioning pin 30 serves as a holding means, the support rods 11a and 11b serve as slide bars, and
The cover 25 corresponds to a safety cover.

FIG. 3 shows a dampening water amount detecting device 22 using the dampening water amount detector 20. In the dampening water amount detection device 22, it is necessary to select, as the dampening water amount detection point, a non-image area portion that is an area on the plate surface to which ink is not applied. In this device, the operator looks for a non-image area on the printing plate 13 and sets a detection point thereof to detect the dampening water amount.

The dampening water amount detecting device 22 includes a dampening water amount detector 20, a manual pointer 21, an angle correction value memory 43,
The controller 39, the adder / subtractor 34, the angle setter 35, the comparator 36, and the trigger output circuit 37 are provided. The angle correction value memory 43 has a manual pointer 21.
The deviation angle θ between the dampening water amount detector 20 and the dampening water amount detector 20 is stored as correction data.

In this embodiment, the controller 39, the adder / subtractor 34, the angle setter 35, and the comparator 3 are used.
6, and the trigger output circuit 37 constitute an irradiation start signal output means. The angle correction value memory 43 corresponds to correction data storage means, and the manual pointer 21 corresponds to irradiation candidate position determination means.

A dampening water amount detecting device 2 will be described with reference to FIGS. 2 and 3.
The detection process in 2 will be described. The operator looks into the printing plate 13 through the viewing hole 21a of the manual pointer 21,
The plate cylinder 5 is rotated to search for a non-image area portion. As shown in FIG. 2, the slider 24 is placed in the lateral direction of the plate surface (axial direction of the plate cylinder 5).
Is moved, the manual pointer 21 integrated with the slider 24 moves in the lateral direction of the printing plate. The slider 24 is moved or the plate cylinder 5 is rotated until a non-image area portion which is considered to be appropriate for detection is found. When the non-image area portion is found, the machine is stopped at that point. After stopping the machine, tighten the stopper bolt 23 shown in FIG.
The slider 24 is fixed.

After the setting is completed, the manual setting switch SW1 shown in FIG. 3 is pressed to input the manual setting signal to the adder / subtractor 34. In this way, the operator
The non-image area of the printing plate 13 held by is input as the irradiation candidate position.

The angle detector 32 includes an encoder 33 and an A / D converter. The encoder 33 is installed coaxially with the plate cylinder 5 or through a gear or a belt (not shown) so as to be in phase with the plate cylinder 5.
The angle detector 32 detects the angle data at the position and gives it to the controller 39. The controller 39
The angle data 40 given from the angle detector 35 and the correction data given from the angle correction value memory 43 are
It is given to the angle setter 35. In this way, when the manual setting signal is input, the angle setter 35 causes the deviation angle θ
The value corrected by the minute is given.

Upon receiving the rotation driving signal, the plate cylinder 5 is driven to rotate by the rotation driving means (not shown). The set angle data thus set and the detected angle data are compared by the comparator 36, and a signal is sent to the trigger output circuit 37 at each coincident timing. Trigger output circuit 37
Gives a trigger signal of a detection point to the dampening water amount detector 20. The dampening water amount detector 20 detects the dampening water amount using this trigger signal as an irradiation start signal. As a result, every time the plate cylinder 5 makes one rotation, the amount of dampening water in the non-image area portion of the plate surface 13 set by the operator is detected.

In this embodiment, the deviation angle θ of the dampening water amount detecting device is stored in advance in the angle correction memory 43. However, the manual pointer 21 may be configured to be able to change the positional relationship with the dampening water amount detector 20, and to be able to input the changed deviation angle θ. With this configuration, the manual pointer 21 can be set at a position where the operator can easily see it.

The dampening water amount detector 20 will be described with reference to FIGS.
A dampening water amount detecting device 122, which is another dampening water amount detecting device using, will be described. The dampening water amount detection device 122 is
Similar to the dampening water amount detecting device 22, the operator searches for a non-image area portion on the printing plate 13 and sets the detection point, whereby the dampening water amount detecting device detects the dampening water amount at the detection point. Is.

FIG. 4 is an exploded perspective view of the slide mechanism portion of the dampening water amount detection device 122. Also in this embodiment, the slide bar 111 is screwed to the cover 25 via the block 25a. Slide bar 11
A dampening water amount detector 20 is movably attached to the unit 1 along the slide bar 111. Damping water amount detector 20
The attachment will be described with reference to FIG. Metal fittings 128 and 129 are screwed to the bracket 127 so as to surround the slide bar 111. The bracket 127, the metal fitting 128, and the metal fitting 129 are fixed to the slide bar 111 by tightening the stopper bolt 23. The plate 130 is screwed to the bracket 127 so as to pass through the long hole 25 b of the cover 25. At the tip of the plate 130, as shown in FIG.
Through the detector mounting bracket 132, the dampening water amount detector 20
Is installed. At the other end of the plate 130, the long hole 13
0a is provided. As shown in FIG. 5, a manual setting pointer 21 is attached between the dampening water amount detector 20 and the plate 130 so as to be sandwiched between them. The connection cord 115 of the dampening water amount detector 20 is wound in a curl shape as shown in FIG. The connection cord 115 is housed in the connection cord receiver 114. Connection cord receiver 114
As shown in FIG. 4, a rod 116 is screwed to the rod, and the rod 116 is wound in a curl shape. The connection cord receiver 114 is screwed to the cover 25. Since the connection cord 115 is curled in this manner, the dampening water amount detector 20 can move along the slide bar 111 without the connection cord 115 being entangled.

The shape of the connecting cord 115 will be described with reference to FIG. As shown in FIG. 6A, the connection cord 11
5 is a non-curl portion 115a on the dampening water amount detector 20 side and a curl portion 115b continuous with the non-curl portion 115a.
Have. The length L1 of the non-curl portion 115a is about half the length of the slide bar 111, and the length L2 of the curl portion 115b is also about half the length of the slide bar 111. When the dampening water amount detector 20 moves in the direction of arrow 125, FIG.
As shown in B, the curl portion 115b expands. Therefore, the dampening water amount detector 20 can move in the direction of arrow 125 without the connection cord 115 getting entangled. Further, since the non-curl portion L1 having a length about half that of the slide bar 111 is provided, as shown in FIG. 6C, the non-curl portion 115a and the curl portion 115b overlap each other, so that the dampening water amount detector 20 can be provided. It can move in the direction of arrow 126. Since the length L2 of the curl portion 115b is about half the length of the slide bar 111, the curl portion 115b can be expanded and contracted in the state shown in FIG. 6C (the state where the curl portion 115b is most extended). The winding diameter of the portion 115b may be determined.

As shown in FIG. 4, when the slide bar 111 is attached to the cover 25, the dampening water amount detector 20 is suitable for the plate 13 due to lack of accuracy of the cover 25 or the fitting for mounting the dampening water amount detector. May not be set properly. Therefore, in the present embodiment, FIG.
The slide bar 111 and the dampening water amount detector 20 were positioned using the jigs 141, 142, and 150 shown in FIG. Regarding the cover 25, the dampening water amount detection device 2
The positioning pin 30 is used for positioning in the same manner as in 2. Further, in order to prevent the positional deviation due to the vibration during printing, the magnet 17 shown in FIG.
It is fixed at 0 to the frame (not shown) of the offset printing apparatus.

For positioning the slide bar 111, jigs 141 and 142 shown in FIG. 7 are used. Positioning pins (not shown) are provided on the frame of the offset printing device to which the present detection device 122 is attached. Through the through holes 141 of the jigs 141 and 142 are provided on the positioning pins.
jigs 141, 1 by penetrating a and 142a.
Set 42 in the frame.

Regarding the positioning in the directions of the arrows 145 and 146, the gaps S1 and S2 between the blocks 141c and 142c.
The shim is adjusted between the slide bar 111 and the block 25a so that the distance becomes a predetermined distance. Further, regarding the positioning in the directions of the arrows 143 and 145, the mounting hole 1 of the slide bar 111, which is a long hole, is formed so that the gap between the slide bar 111 and the jigs 141 and 142 is eliminated.
Adjust with 11a and 111b. As a result, the slide bar 111 is positioned with respect to the plate cylinder 5. After the slide bar 111 is positioned with respect to the plate cylinder 5, the jig 1
Remove 41.

Next, the positioning of the dampening water amount detector 20 with respect to the plate cylinder 5 will be described. A jig 150 shown in FIGS. 8 and 9 is used for this positioning. As described below, the jig 150 allows the dampening water amount detector 20 to be directed toward the center of the plate cylinder 5, and the distance d2 between the dampening water amount detector 20 and the plate 13 is set to a predetermined value. Can be kept at a distance.

As shown in FIG. 8, the jig 150 includes a main body 1
51 and a pair of rod-shaped members 152, 152 which are abutting portions
Is equipped with. The main body 151 has a bottom surface portion 151a into which the tip of the dampening water amount detector 20 is inserted, and at least a part of the tip contacts. A pair of rod-shaped members 152, 152 is provided in a protruding manner on the side opposite to the bottom surface portion 151 a of the main body 151. In this embodiment, as shown in FIG. 9, one surface 151c of the main body 151 has rod-shaped members 152, 1
Since 52 is attached, the rod-shaped member 152,
A body 152 is provided so as to project from the body 151. The rod-shaped members 152, 152 were attached to the main body 151 by screwing them (not shown) by partially milling the circumferential portions with the same shape. The bottom surface 151
As for the depth of a, the plate-shaped members 152, 152
It is determined so that the distance d2 between the dampening water amount detector 20 and the plate 13 is maintained in the state where they are in contact with each other.

On the plate 13, rod members 152 of the jig 150, 1
52 is brought into contact, and in this state, the dampening water amount detector 20 is set on the jig 150. While being temporarily held by the leaf spring 151d, the dampening water amount detector 20 is fixed to the detector mounting bracket 132 using the screw hole 20a. Thus, the detector mounting bracket 132 is provided with the long hole 132a, so that the dampening water amount detector 20 can be directed to the center of the plate cylinder 5. As shown in FIG. 5, a long hole 130a is provided at the other end of the plate 130, and the distance between the dampening water amount detector 20 and the plate can be adjusted by loosening the screw 136. In this way, the jig 150 can easily perform positioning in the directions of arrows 155 and 156 and positioning in the directions of arrows 153 and 154. After the dampening water amount detector 20 is positioned with respect to the plate cylinder 5, the jig 150 is removed.

The dampening water amount detector 20 can be attached to the cover 25 in an oblique direction as shown in FIG. Since such a mounting method is possible, the dampening water amount detector 20 can be mounted on a multi-color printing device (for example, four-color printing) without limiting the mounting position. In this case, the auxiliary metal fittings 13 as shown in the figure should be installed so that the plate 130 can be mounted smoothly.
3 may be used. In addition, as in the above-described embodiment, the plate 130 is provided with the elongated hole 130a, and the screw 1
By loosening 36, the distance between the dampening water amount detector 20 and the plate can be adjusted. The slide bar 111 may be attached in the same manner as shown in FIG. In this case, the slide bar 111 is the dampening water amount detector 2
Since it is arranged diagonally above 0, the manual setting pointer 21 may be attached to the lower portion of the dampening water amount detector 20, as shown in FIG. In this embodiment, the connection cord receiver 114 is exposed not to the inside of the cover 25 but to the outside, but this is due to a space-related problem, and the present invention is not limited to this, and the above-described embodiment is used. As in the example, it may be provided inside the cover 25.

The method for the operator to search for the detection point using the manual pointer 21 and the method for detecting the amount of dampening water at this detection point are the same as those in the above-mentioned embodiment, and the explanation thereof is omitted.

The mounting position of the dampening water amount detector 20 is not limited to the position shown in the above embodiment. For example, in FIG.
1, the ink roller group 27, the water roller 28,
220a, 220b, or 2 in relation to the blanket cylinder 29
It may be attached at any position of 20c. By arranging the dampening water amount detector 20 at these positions and inputting the detected value to the control device, the detected dampening water amount can be used as an input for the dampening water amount control device. .

Also, these 220a, 220b, 220c
It is also possible to detect a change in the plate surface in the ink roller group 27 or a change in the plate surface in the printing state with high resolution by providing the detection devices at all three positions.

Further, in this embodiment, the leaf spring 151d for temporarily holding the dampening water amount detector 20 in the jig 150 is used.
Is provided. As a result, the state in which the dampening water amount detector 20 is positioned is temporarily held, so that the dampening water amount detector 20
Setting is easy. The temporary holding means is not limited to this, and may have another shape.

Further, in the present embodiment, since the pair of rod-shaped members 152, 152 are adopted as the contact portions, the jig 1
The 50 can be manufactured accurately and easily. The contact portion is not limited to this, and may have a shape that matches the plate cylinder on which the plate is mounted.

In this embodiment, by using the jig 150, the dampening water amount detector can be directed to the axis center of the plate cylinder. However, the present invention is not limited to this, and if the jig 150 is adjusted so that a predetermined angle is formed with respect to the axial center of the plate cylinder, it can be oriented at a predetermined angle with respect to the axial center of the plate cylinder.

Further, in this embodiment, the connection cord 1
By making 15 curled, the connection cord 115 is made to be expandable and contractible. However, the flexible shape of the connection cord 115 is not limited to the curl shape,
The dampening water amount detector 20 without the connection cord 115 being entangled.
Any shape may be used as long as it can move, for example, a zigzag shape or the like.

[0048]

In the offset printing apparatus with the dampening water amount detecting mechanism according to the first aspect of the present invention, when the safety cover which can be opened and closed is closed, the safety cover is held at a predetermined position by the holding means with respect to the plate cylinder. Held in. The slide bar is fixed to the safety cover and is parallel to the axis of the plate cylinder when the safety cover is closed. The dampening water amount detector is provided movably along the slide bar. Therefore, in the state in which the safety cover is closed, the dampening water amount detector holds the dampening water amount detector at a predetermined position and is movable parallel to the axis of the plate cylinder. Further, when the safety cover is opened, the dampening water amount detector separates from the printing mechanism section together with the safety cover. As a result, the slide bar does not interfere with the work of the printing mechanism. Therefore, it is possible to detect the dampening water amount regardless of the position of the detection point while accurately maintaining the distance from the plate surface, and to provide the dampening water amount detecting device in the offset printing device with good workability. can do.

In the offset printing apparatus with the dampening water amount detecting mechanism according to the second aspect, the connecting cord storing means stores the connecting cord having a stretchable shape. Therefore, when the dampening water amount detector is moved, the connection cord does not get entangled. Accordingly, it is possible to provide the dampening water amount detection device in which the dampening water amount detector can be moved and the connection cord is not entangled when the dampening water amount is detected.

In the method for mounting the dampening water amount detector of the third aspect, the printing mechanism section is covered with a safety cover that can be opened and closed. When the safety cover is closed, the dampening water amount detector is movable in parallel with the axis of the plate cylinder, and is kept in a predetermined position with respect to the plate cylinder. A water flow detector can be attached to the safety cover. Therefore, when the safety cover is closed, the dampening water amount detector is held at a predetermined position and is movable parallel to the axis of the plate cylinder. Further, when the dampening water amount detector opens the safety cover,
Along with that, the printing mechanism section is separated. This allows
The work of the printing mechanism is facilitated. Therefore, the dampening water amount can be detected regardless of the position of the detection point while accurately maintaining the distance from the plate surface, and the dampening water amount detecting method in the offset printing apparatus with good workability is provided. can do.

In the jig of claim 4, the main body is
The dampening water amount detector has a bottom portion into which a tip is inserted and at least a part of the tip abuts. Further, the abutting portion is provided so as to project on a side opposite to the bottom surface portion of the main body, abuts on the plate surface, and keeps a distance between the bottom surface portion and the plate surface at a predetermined distance. , Orient the dampening water amount detector at a predetermined angle with respect to the axial center of the plate cylinder. Therefore, the distance between the tip of the dampening water amount detector and the plate surface can be kept at a predetermined distance, and the dampening water amount detector can be oriented at a predetermined angle with respect to the axial center of the plate cylinder. As a result, the attachment of the dampening water amount detector becomes accurate and easy.

In the dampening water amount detecting device in the offset printing apparatus according to the fifth aspect, when the rotation driving signal is received, the rotation driving means drives the plate cylinder to rotate. When the irradiation candidate position is input by the irradiation candidate position determination means, the correction data irradiation start signal output means outputs the correction data irradiation start signal output means for each rotation cycle of the plate cylinder based on the correction data stored in the correction data storage means. In order to irradiate the irradiation candidate position, to the dampening water amount detector,
An irradiation start signal is output. Upon receiving this irradiation start signal,
The dampening water amount detector detects the dampening water amount. Therefore, the irradiation candidate position determining means can perform detection at this irradiation candidate position only by inputting the non-image area portion as the irradiation candidate position. This makes it possible to provide a dampening water amount detection device in which the detection position can be easily determined.

In the method for detecting the amount of dampening water in the offset printing apparatus according to the sixth aspect, an irradiation candidate position which is deviated from the detection position of the dampening water amount detector by a predetermined rotation angle with respect to the rotation direction of the plate cylinder is determined. Then, based on the rotation deviation angle,
The amount of dampening water is detected at the irradiation candidate position while rotating the plate cylinder. Therefore, the detection position may be determined at an irradiation candidate position that is deviated from the detection position of the dampening water amount detector by a predetermined rotation angle, and thus the irradiation candidate position can be easily determined.
This makes it possible to provide a dampening water amount detection method in which the detection position can be easily determined.

[Brief description of drawings]

FIG. 1 is a view showing a method of mounting a dampening water amount detector 20 which is an embodiment of the present invention.

FIG. 2 is a view of FIG. 1 viewed from a direction of an arrow A.

FIG. 3 is a dampening water amount detection device 2 according to an embodiment of the present invention.
It is a functional block diagram of 2.

FIG. 4 is an exploded perspective view of main parts for explaining a method of mounting the dampening water amount detector 20 in the dampening water amount detecting device 122.

5 is a diagram for explaining a method of mounting the dampening water amount detector 20 in the dampening water amount detecting device 122. FIG.

FIG. 6 is a diagram for explaining a stretched state of a connection cord 115.

7 is a perspective view showing a jig 141. FIG.

FIG. 8 is a perspective view showing a jig 150.

9 is a cross-sectional view showing a jig 150. FIG.

FIG. 10 is a diagram for explaining another attachment method of the dampening water amount detector 20 in the dampening water amount detecting device 122.

FIG. 11 is a view for explaining another attachment method of the dampening water amount detector 20.

[Explanation of symbols]

 11a ... Support rod 11b ... Support rod 20 ... Damping water amount detector 21 ... Manual setting pointer 25 ... Cover 30 ... Positioning pin 34 ... Adder / subtractor 35 ... Angle setting device 36. Comparator 37 ... Trigger output circuit 39 ... Controller 43 ... Angle correction value memory 70 ... Switching device 72 ... Water Motor speed setting device 74 ... Water amount setting device 75 ... PID 76 ... Motor controller 150 ... Jig 151 ... Main body 152 ... Rod-shaped member

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B41F 33/14 G01B 11/06 Z

Claims (6)

[Claims] 1. A printing mechanism section in an offset printing apparatus having a plate cylinder, a safety cover for opening and closing the printing mechanism section, and a predetermined safety cover for the plate cylinder when the safety cover is closed. Holding means for holding in a position; a slide bar fixed to the safety cover, the slide bar being provided so as to be parallel to the axis of the plate cylinder when the safety cover is closed; A dampening water amount detector for irradiating the held plate with light, receiving the light reflected by the plate, and detecting the dampening water amount based on the received light amount, along the slide bar. An offset printing device with a dampening water amount detection mechanism, which is provided with a dampening water amount detector that is movable. 2. The offset printing apparatus with the dampening water amount detection mechanism according to claim 1, further comprising a connection cord housing means for housing a connection cord of the dampening water amount detector, wherein the connection cord is the connection cord housing means. An offset printing device with a dampening water amount detection mechanism, characterized in that it is stored in a retractable shape. 3. A plate held on a plate cylinder is irradiated with light,
Receiving light reflected by the plate, a dampening water amount detector for detecting the amount of dampening water based on the received light amount, a method of attaching to an offset printing apparatus having a printing mechanism unit equipped with a plate cylinder, The printing mechanism is covered with a safety cover that can be opened and closed, and when the safety cover is closed, the dampening water amount detector is movable in parallel with the axis of the plate cylinder, and with respect to the plate cylinder. To be held in place,
The dampening water amount detector is attached to the safety cover, wherein the dampening water amount detector is attached. 4. A jig for positioning the dampening water amount detector with respect to the offset printing apparatus according to claim 1, wherein a tip of the dampening water amount detector is inserted, and at least a part of the tip is inserted. A main body having a bottom surface portion that abuts, a contact portion that is provided so as to project on the side opposite to the bottom surface portion of the main body, abuts on the plate surface, and a distance between the bottom surface portion and the plate surface is predetermined. And a contact portion for directing the dampening water amount detector at a predetermined angle with respect to the axial center of the plate cylinder. 5. Upon receiving an irradiation start signal, the plate held by the plate cylinder is irradiated with light, the light reflected by the plate is received, and the dampening water amount is determined based on the received light amount. A dampening water amount detector for detecting, an irradiation candidate position determining means for inputting a non-image area of the plate held on the plate cylinder as an irradiation candidate position, and a rotation driving means for rotating and driving the plate cylinder in response to a rotation drive signal. An irradiation surface formed by the dampening water amount detector, and a correction data storage unit that stores a positional deviation between the irradiation candidate position as correction data, based on the correction data, for each rotation cycle of the plate cylinder,
Damping water amount detection in an offset printing apparatus, comprising: irradiation start signal output means for outputting an irradiation start signal to the dampening water amount detector so that the irradiation candidate position is irradiated. apparatus. 6. A method for detecting the amount of dampening water in an offset printing apparatus using a dampening water amount detector for detecting the amount of dampening water on the basis of light reflected by a plate held on a plate cylinder that is driven to rotate, With respect to the rotation direction of the plate cylinder, the irradiation position is determined by deviating a predetermined rotation angle from the detection position of the dampening water amount detector, and based on the rotation deviation angle, the irradiation candidate position is rotated while rotating the plate cylinder. The method for detecting the amount of dampening water in the offset printing apparatus is characterized in that the amount of dampening water is detected by.