JP3082443B2 - Picture area ratio measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dividing a printing plate after completion of the printing plate into equal portions at predetermined intervals in a printing width direction and measuring a pattern area ratio for each of the equally divided regions (ink key zones). The present invention relates to a pattern area ratio measuring device.

[0002]

2. Description of the Related Art A printing plate obtained by baking and exposing a predetermined pattern and developing it is used at a predetermined interval in a printing width direction by a pattern area ratio measuring device before being mounted on a printing machine and used. The pattern area ratio is measured for each equally divided area (ink key zone of an ink key that is opened and closed to adjust the ink supply amount provided in the ink supply means along the printing width direction).

[0003] The pattern area ratio measurement data obtained by this measurement is set in advance (preset) of the opening and closing amount of an ink key for adjusting the ink supply amount of an ink supply means provided along the printing width direction of a normal printing press. Used as data for

A pattern area ratio measuring apparatus for measuring the pattern area ratio is a plate such as a conveyor belt for accurately feeding a printing plate to be measured to a measuring section along a conveying direction (tentatively a straight line Y direction). Conveying means; width-shifting means for positioning the printing plate in the X direction orthogonal to the Y direction; and a printing plate in the Y direction (conveying direction) downstream of the conveying means in the conveying direction. Equipped with a measuring device equipped with an optical reading sensor such as a reflected light amount measuring sensor that reads the picture area of the printing plate while transporting, or an area type or linear type CCD sensor. Are positioned in the X direction orthogonal to
The pattern area is measured by the measuring means.

[0005] The printing plate conveyed by such plate conveying means is positioned in the X direction orthogonal to the conveying direction (Y direction) before being carried into the measuring device main body and positioned, and then the image area is read by the optical reading sensor. A conventional pattern area ratio measuring apparatus for measuring the image area ratio is disclosed in, for example, Japanese Patent Application Laid-open
No. 13, while the printing plate is transported in the Y direction by the plate transport means, the width shifting means for positioning in the X direction,
One side edge in the width direction of the printing plate is pressed by a pusher (a push pin, a pressing tool with a roller) or the like, and the other side edge comes into contact with a side guide plate fixed at a predetermined position and is shifted in width. To perform positioning in the X direction.

[0006]

In the above-mentioned conventional pattern area ratio measuring apparatus, the printing plate, which is brought into contact with the side guide plate and positioned in the X direction, is conveyed in the Y direction along the side guide plate. When carrying out measurement while carrying the printing plate into the measuring means, a contact frictional force (dynamic frictional force) is generated between one side edge of the printing plate being conveyed and moved and the side guide plate, and the printing plate when carrying in the printing plate is moved. In some cases, an error may occur in the measurement by the measuring means.

The present invention relates to a picture area ratio measuring apparatus,
When the printing plate positioned in the direction perpendicular to the conveyance direction is conveyed in the conveyance direction, and is carried into the measuring means to measure the picture area, the printing plate can be carried into the measuring means without positional displacement, and the measurement error The purpose is to allow the pattern area to be measured accurately without any problem.

According to the present invention, there is provided a measuring means for measuring a reflected light amount of a printing plate to obtain a picture area ratio for each ink key zone, a plate conveying means for carrying the printing plate into the measuring means, and the measuring means by the plate conveying means. In a picture area ratio measuring device comprising: a printing plate to be carried in, and a width-measuring means for positioning the printing plate in a direction orthogonal to the carrying-in direction,
A reference guide and a pusher are provided to be opposed to each other in a direction orthogonal to the carrying direction of the printing plate and move toward and away from each other, and the printing plate side edge is pressed by the reference guide and the pusher. After positioning the printing plate in the direction perpendicular to the loading direction by shifting the printing plate to the reference guide side, the reference guide and pusher can be retracted to a predetermined position, and the printing plate does not contact the reference guide and pusher. This is a picture area ratio measuring device characterized by being transported.

[0009]

FIG. 1 is a plan view of a picture area ratio measuring apparatus according to the present invention, in which a picture using a thin aluminum plate as a substrate is printed and exposed. Plate conveying means A for conveying the printing plate 1 such as a PS plate (presensitized printing plate) after the printing, and a conveying width direction (hereinafter referred to as X direction) orthogonal to the conveying direction of the printing plate 1 (hereinafter referred to as Y direction). ), Width adjusting means B for aligning the printing plate 1 to a predetermined position in the X direction by pressing or pushing or pulling by appropriate means, and an optical pattern reading sensor 21. Picture area measuring section C
Is provided.

The plate conveying means A includes an endless belt for conveying the printing plate 1 in the Y direction, an endless belt having a pressing roller on the belt, an endless chain or a pushing pin provided at equal intervals on the chain (or A plunger), or a push pin (or plunger) that reciprocates in the Y direction (transport direction) by an appropriate driving source such as an air cylinder.

In FIG. 1, a plate conveying means A includes, for example, an endless belt 6 wound around guide rollers 2 and 3.
6 and 6, between the guide rollers 2 and 3, an appropriate number of intermediate guide rollers 4 and 5 are arranged.

The width shifting means B regulates one edge 1a of the printing plate 1 conveyed by the conveying means A, and is provided in a predetermined direction (X direction) perpendicular to the conveying direction (Y direction) of the conveying means A. And a reference guide 11 (a plate-shaped side guide parallel to the transport direction (Y direction)) movable between the reference position and the retracted position on the side of the transport unit A. On the other end 1b side of the plate 1, a pusher 12 (a pin-shaped pusher that can be operated by a mechanism that performs a linear reciprocating drive operation by an air cylinder or an electric motor) is provided. Prepare.
A printing plate front end passage detection sensor 27 (such as a photo sensor) is provided on the upstream side in the transport direction of the width shifting unit B.

The measuring means C includes an optical pattern reading sensor 21 (an optical reflection density detecting sensor of a sub-scanning moving type in the X direction or a fixed area type CCD image reading sensor,
Or a stationary X-direction linear CCD image reading sensor or the like), and before and after the picture reading sensor 21 in the Y direction (transport direction), the reading and feeding control rollers 22 and 23 are respectively provided.
Place.

Further, stoppers 26, 26 for blocking and stopping the plate-shaped or pin-shaped printing plate 1 are arranged between the reading and feeding control roller 22 and the optical reading sensor 21 so as to be arranged in a straight line in the X direction. Equipped with the stopper 2
On the damming side of No. 6, a detection sensor 24 such as a photosensor capable of detecting the front end of the blocked printing plate 1 is provided. Each detection sensor 24 is installed at a height that does not hinder the passage of the printing plate 1 being conveyed.

FIG. 2 is a side view of the picture area ratio measuring device shown in FIG. 1. The feed control rollers 22 and 23 are provided with a pair of nip rollers 22a and 22a opposed to each other vertically.
2b, 23a and 23b, and the upper roller 22
a, 23a are capable of pressing or separating from the lower rollers 22b, 23b, respectively.

In the present invention, as shown in FIG. 1, a dot passing area of the printing plate 1 between the plate conveying means A and the measuring means B has a dot area outside the picture area of the printing plate 1. (0%
To 100%) in several steps, and a detection sensor 25 for detecting a plate-shaped calibration mark 1e printed and printed, or a plate identification mark 1e for displaying a print size, a print color, an item, and the like. Prepare for.
Each detection sensor 25 is installed at a height that does not hinder the passage of the printing plate 1 being conveyed.

The width shifting means B shown in FIG. 1 in the picture area ratio measuring apparatus of the present invention comprises a reference guide 11 which moves from a reference position to a retracted position, and a repetition in the X direction which is provided opposite to the reference guide. And a pusher 12 for moving the printing plate 1 toward the reference guide 11 by a moving operation. A retracting mechanism for moving the reference guide 11 from a reference position to a retracted position, its operation, and the pusher 1
The width shifting mechanism 2 in the X direction and its operation will be described in detail below.

FIG. 3 shows an example of the reference guide 11.
Is the reference guide pin 11a (or reference guide plate)
And an X-direction movable block 11b on which the reference guide pin 11a is mounted upright.
Is fitted on an X-direction guide shaft 14 which is fixedly mounted on the apparatus body frame F ₁ and the intermediate frame F _3, and is movable along the shaft 14.

[0019] movable block 11b is screw portion 13a of the guide device in parallel to the shaft 14 body frames F ₁ and the intermediate frame F ₃ and rotatably supported by been threaded shaft 13 is screwed, the screw shaft The screw shaft 13 is rotated forward or backward by driving and rotating the drive rotation gear 13b pivotally supported on the drive shaft 13 by the drive rotation means 15, and the movable block 11b can be moved in the X direction along the guide shaft 14. At one end of the screw shaft 13, a rotary encoder 19a for detecting the number of rotations of the screw shaft 13 is provided.

The drive rotation means 15 includes a transmission gear 15a meshed with a drive rotation gear 13b supported by the screw shaft 13, a sprocket or pulley 15b coaxial with the gear 15a, and a drive sprocket or drive pulley 15e. And an electric motor 15f such as a pulse motor or a servo motor for driving and rotating the driving sprocket or the driving pulley 15e. The rotation of the electric motor 15f is started, and the screw shaft 13 is started.
Is driven and rotated to move the movable block 11b in the X direction along the guide shaft 14 by a predetermined distance based on the detection signal of the rotary encoder 19a, so that the reference guide 11 integrally attached to the movable block 11b is moved. Is retracted from the reference position to a predetermined retract position in the X direction.

A pusher 12 is provided opposite to the reference guide 11 so as to be capable of repeatedly moving in the X direction. The pusher 12 includes a pusher pin 12a and an X-direction movable block on which the pusher pin 12a is mounted upright. 1
2b.

The movable block 12b is fitted on an X-direction guide shaft 17 which is supported by being fixedly mounted on an apparatus main body frame F ₂ (right side in FIG. 3) and an intermediate frame F _3. 17 is free to move,
The movable block 12b has the guide shaft 1
7, the main body frame F ₂ and the intermediate frame F
₃ and rotatably supported by the screw portion 16a of the screw shaft 16 is screwed, the screw shaft 16 by the driving rotation gear 16b axially supported fixed to the screw shaft 16, is rotatably driven by a driving rotating means 18 Can be rotated forward or reverse to move the movable block 12b in the X direction along the guide shaft 17.

At one end of the screw shaft 17, a rotary encoder 19b for detecting the rotation speed of the screw shaft 17 is provided. The screw 13a screwed to the movable block 11b having the reference guide pin 11a erected, and the screw 16a screwed to the movable block 12b having the pusher pin 12a erected, have a reverse screw relationship. It may or may not have any.

The drive rotation means 18 has the same structure as the drive rotation means 15 and has a transmission gear 18a meshed with a drive rotation gear 16b fixedly supported on a screw shaft 16.
A sprocket or pulley 18b coaxial with the gear 18a, and a driving sprocket or driving pulley 1
8e and the drive sprocket or drive pulley 18
e and an electric motor 18f such as a pulse motor or a servo motor for driving and rotating e.

The electric motor 18 of the driving rotation means 18
f is started to rotate at a predetermined rotation speed set in advance,
The electric motor 18f is repeatedly rotated forward / reverse by a predetermined number of times via a reversing circuit for generating a reversing operation signal in response to a rotation speed detection signal of the rotary encoder 19b (or a timing signal of a timer started by starting the electric motor 18f). By rotating the screw shaft 16, the screw shaft 16 is repeatedly rotated forward and backward at a predetermined amplitude and period. Thereby, the movable block 12b and the pusher pin 12a integrated therewith are
Is repeated in a predetermined cycle in the X direction along the arrow, and the printing plate 1 in contact with the pusher pin 12a is moved toward the reference guide 11 in the width direction.

Next, another example of the retracting mechanism of the reference guide 11 of the width adjusting means B and the width adjusting mechanism of the pusher 12 in the picture area ratio measuring apparatus of the present invention will be described in detail with reference to FIG. The guide 11 is a reference guide pin 11a.
(Or a reference guide plate) and the reference guide pin 11
The movable block 11b is mounted on the X-direction guide shafts 37, 37 supported on the apparatus main body frame F, and is mounted along the X-direction movable block 11b. It is movable.

The movable block 11b is attached to the tip of an operating rod 36a of a reciprocating operation mechanism such as an air cylinder 36 attached to the apparatus main body frame F in parallel with the guide shaft 37.
By moving the movable block 11 forward and backward.
b can be moved in the X direction along the guide shaft 37.

The pusher 12 is a pusher pin 1.
2a and X attached with the pusher pin 12a standing upright.
Direction movable block 12b.
Is mounted on an X-direction guide shaft 39, which is supported on the apparatus main body frame F, and is movable along the shaft 39, and the movable block 12b is parallel to the guide shaft 39. The operation rod 3 is attached to the tip of an operation rod 38a of a reciprocating operation mechanism such as an air cylinder 38 attached to the apparatus main body frame F.
The movable block 12b can be moved in the X direction along the guide shaft 39 by moving the 8a forward and backward.

Here, the movable blocks 11b and 12b operate the operating rods 36a and 38a of the reciprocating operation mechanism, respectively, so that the movable blocks 11b and 12b move in a direction of moving toward and away from each other. A reference guide pin 11a and the pusher pin 12a
Is an interlocking operation in which they move in the approaching direction and the separating direction at the same time.

In the width adjusting means B in the picture area ratio measuring apparatus of the present invention, at least the minimum approach distance between the reference guide pin 11a and the pusher pin 12a is set to the width of the printing plate 1 in the X direction. For example, as described later with reference to FIG. 5, a photo sensor or the like that can detect the presence of the edge of the printing plate 1 integrally with the reference guide pin 11a (or the reference guide plate) on the reference guide 11 side The edge detection sensor is disposed so that the X-direction approaching operation of the pusher 12 is stopped based on the detection signal. The role of the edge detection sensor is described in Japanese Patent Laid-Open No.
Since it is described in detail in the 23613 publication, it is omitted here.

Further, in the width shifting means B in the picture area ratio measuring apparatus of the present invention, the X-direction moving operation and the retreating operation mechanism of the reference guide 11 shown in FIG. 3 and the X-direction moving operation of the pusher 12 shown in FIG. A (pressing operation) mechanism may be used together, and an X-direction moving operation and a retreating operation mechanism of the reference guide 11 shown in FIG. 4 and an X-direction moving operation (pressing operation) mechanism of the pusher 12 shown in FIG. May be used in combination.

FIGS. 5A and 5B are front views showing another example of the retracting mechanism on the side of the reference guide 11 of the width shifting means B in the picture area ratio measuring device of the present invention. FIG. 5 (a)
Is such that a reference guide pin 11a (or a reference guide plate) of the reference guide 11 can be retracted downward from above, and the reference guide pin 11a is supported and attached to the upper end of the screw shaft 41 in the vertical direction. The reference guide pin 11a has a tapered surface 42 inclined outward (to the left in FIG. 5) toward an upper end thereof and a vertical surface 42a below the tapered surface 42.

The lower end of the vertical surface 42a is connected to the horizontal surface 42b.
The printing plate edge detection sensor 11c for confirming the presence of one edge of the printing plate 1 such as a photo sensor may be appropriately provided on the horizontal surface 42b.

The screw shaft 41 has a screw 41a, and a lower end side of the screw shaft 41 is a spline shaft 41b. The spline shaft 41b has a spline fitting groove 41c along the axial direction. The spline shaft 41b and the spline fitting groove 41c are provided with the fitting hole 49 of the apparatus main body F and the spline fitting projection 49 thereof.
a is slidably fitted to a.

A cylindrical rotating body 43 is vertically rotatably supported on the apparatus body frame F via a bearing 44 such as a metal bearing or a needle bearing, and an internal screw carved in the cylinder of the rotating body 43. By screwing the screw 41a of the screw shaft 41 to the screw shaft 43a, the screw shaft 41 is supported in the vertical direction.

A gear 45 is engraved below the cylindrical rotary member 43, and an intermediate gear 46 meshing with the gear 45 is provided.
The gear 45 is rotated by a gear 47 driven and rotated by an electric motor 48 (such as a pulse motor),
By rotating the screw 3 forward or backward, the screw shaft 41 screwed to the rotating body 43 and the reference guide pin 11a attached to the distal end thereof can be moved up or down in the vertical direction.

For example, FIG. 5A, reference guide pin 11
a is raised by the forward rotation of the electric motor 48 to set the vertical surface 42a to a height facing the one edge 1a of the printing plate 1, and then the X-direction moving mechanism of FIG. Is operated to push one end edge 1b of the printing plate 1 toward the reference guide pin 11a in the X direction to move the printing plate 1 to the width, and the other end edge 1a of the printing plate 1 to the reference guide pin 11a. After abutting against the vertical surface 42a and positioning in the X direction, the pusher 12 is moved backward from the one end 1b, and the reference guide pin 11a is moved downward by the reverse rotation of the electric motor 48 to move the tapered surface 4a.
2 is lowered to the height of the other end 1a of the printing plate 1 to create a gap between the tapered surface 42 and the other end 1a, thereby releasing the contact between the reference guide 11 and the printing plate 1. It is.

FIG. 5 (b) shows a case where the reference guide 11 is moved in the X direction and retracted by rotating the reference guide 11 in reverse via a support shaft. The reference guide pin 11a is supported and attached to the upper end of the vertical arm 51, and the contact surface against which the printing plate 1 is pressed is a vertical surface 11d. In addition,
A plate edge detection sensor 11c for the front end 1a of the printing plate 1 may be provided integrally on the vertical surface 11d side of the arm 51 as appropriate.

The lower end of the arm 51 is integrally mounted and supported on a support shaft 52 rotatably supported on the apparatus main body frame F, and a rotating gear 53 is supported on the support shaft 52. The rotating gear 53 can be rotated by driving and rotating a driving gear 54 meshing with the driving gear by a driving source 55 such as an electric motor (eg, a pulse motor) or a rotary air cylinder. The supported reference guide pin 11a is configured to perform a reverse rotation operation between a vertical state and a horizontal state, for example.

For example, FIG. 5B, reference guide pin 11
a is changed to a vertical state by the forward rotation of the electric motor 55, and then the pusher 12 employing the X-direction moving mechanism shown in FIG. 3 or FIG. 4 is operated to set the one edge 1b of the printing plate 1 as a reference. After pressing the guide plate 11a in the X direction by pushing it in the X direction and bringing the other end edge 1a of the printing plate 1 into contact with the vertical surface 11b of the reference guide pin 11a to perform positioning in the X direction, the pusher 12 is moved. The reference guide pin 11a is moved backward from the one edge 1b to separate the reference guide pin 11a from the electric motor 5.
5, the printing plate 1 is lowered to the level of the other end 1b of the printing plate 1 by the reverse rotation drive to lower the vertical surface 11b of the reference guide pin 11a and the other end 1a.
The gap between the reference guide 11 and the printing plate 1 is released.

Next, the operation of measuring the pattern area ratio of the printing plate 1 by the pattern area ratio measuring apparatus of the present invention will be described in detail with reference to the plan view of FIG. 1 and the schematic side view of FIG. First, the printing plate 1 is placed at the position shown by the dotted line on the conveyor belt 6 to be transported by the plate transporting means A and transported in the Y direction, and is detected by the printing plate front end passage detection sensor 27 installed in the middle of the transport. The front end 1c of the printing plate 1 is detected.

Upon detection of the printing plate front end 1c, the sensor 27 sends a width-shifting operation signal, whereby the conveyor belt 6 of the plate transport means A stops to stop the printing plate 1, and then the width-shifting means B Start operation.

At the start of the operation of the width shifting means B, the reference guide 11 has been moved to the reference position S in the X direction and has stopped (see FIG. 1) in advance, or the reference guide 11 It moves from the retreat position on the side of the apparatus main body to the reference position S in the X direction (see FIG. 1) and stops.

At that time, the pusher 12 performs an approach pressing operation or a separating operation in the X direction toward the reference guide 11 to perform a one-cycle width shifting operation. At this time, the pusher pin 12a of the pusher 12 pushes the one end 1b of the stationary printing plate 1 in the X direction to shift the printing plate 1 in width, and the other end 1a of the printing plate 1 opposes the reference guide. 11
(Reference guide pin 11a or reference guide plate), and subsequently, the reference guide 11 moves from the reference position S in the X direction at a position on the side of the apparatus main body and performs a retreat operation.

Thus, the left and right edges 1 of the printing plate 1
A state is obtained in which the four edges including a and 1b are not in contact with any of the plate conveying means A.

The above-mentioned series of width shifting operations of the reference guide 11 and the pusher 12 are operated in conjunction with a drive system as shown in FIGS. 3 and 4 and a sequencer electronic control for controlling the drive system. .

Regarding the operation sequence in the width shifting operation, for example, in synchronization with the one-cycle width shifting operation consisting of the pressing operation by the pusher 12 approaching the edge of the printing plate 1 and the separation operation, the reference is made. By moving the guide 11 to the reference position S in the X direction and retreating, the printing plate 1 may be shifted in width.

As described above, when the reference guide 11 retreats and the pusher 12 separates, the conveying operation is resumed by the conveyor belt 6 of the plate conveying means A, and the printing plate 1 is moved.
Is carried into the measuring means C.

The printing plate 1 carried into the measuring means C is separated from a pair of upper and lower rollers 22 which are moving apart from each other.
The printing plate 1 is introduced between the reading and feeding control rollers 22 a and 22 b, and the stopper 26 stops the front end 1 c of the printing plate 1 in front of the optical reading sensor 21. Thus, the front end 1c of the printing plate holds a posture parallel to the X direction.

The stopped front end 1c is detected by the detection sensor 24, and the detection signal causes the upper roller 22a of the reading and feeding control roller 22 to move downward, and to press the lower roller 22b opposite thereto to move the printing plate 1a.
, The upper roller 23a of the reading and feeding control roller 23 simultaneously moves down and presses the lower roller 23b opposed thereto.

Subsequently, the read feed control roller 22 and the read feed control roller 23 are driven to rotate at a predetermined rotational peripheral speed by a servomotor, a pulse motor, or the like, so that the printing plate 1 is held in the Y direction. And the printing plate 1 is carried into the lower side of the optical reading sensor 21.

The printing plate 1 carried under the optical reading sensor 21 is moved to the sensor structure of the optical reading sensor 21 (X direction movable scanning CCD sensor head, X direction movable scanning photo sensor head, or area type CCD sensor). Head or linear CCD sensor head), the reading and feeding control roller 22 and the reading and feeding control roller 23 are rotated intermittently or continuously, so that an intermittent transport operation method for each predetermined transport distance or continuous transport is performed. In the operation method, the image is conveyed in the Y direction, and the pattern area ratio of the printing plate 1 is measured.

The measurement of the picture area ratio by the measuring means after the printing plate 1 is carried into the measuring means of the picture area ratio measuring apparatus of the present invention is described in, for example, JP-A-3-223613 filed earlier by the present applicant. The optical reading sensor 21 of the measuring means C shown in FIG. 1 is provided with a movable type in the X direction (a direction orthogonal to the transport direction of the printing plate 1). (For example, a CCD sensor having a detection area of about 25 to 30 μm square with a pixel size of about 25 to 30 μm square, a photo sensor, or the like), and a printing plate in the transport direction (Y direction). 1 is intermittently conveyed at predetermined intervals (detectable width of the optical reading sensor 21 in the Y direction), and each time the printing plate 1 is stopped, the optical reading is performed in the X direction during the stop. The take head 21a is continuously moved, and at predetermined regular intervals in the X direction (for example, 30 mm).
Each time), the image area ratio is detected for each predetermined width in the X direction by a photo interrupter or the like, and the X
This is to detect the image area ratio of the picture for each equally divided region in the direction.

Another measurement method when the printing plate 1 is intermittently conveyed in the Y direction and measured as described above is as follows.
As the optical reading sensor 21 of the measuring means C shown in FIG.
For example, it is possible to use a fixed area type CCD sensor that includes the entire width of the printing plate 1 in the X direction as a detectable region as the optical detection head. As a measuring method when the printing plate 1 is continuously transported in the Y direction and measured, for example, a fixed linear CCD that includes the entire width of the printing plate 1 in the X direction as a detectable region is used.
It is also possible to use the sensor as an optical detection head.

[0055]

The picture area ratio measuring device of the present invention measures the amount of reflected light of the printing plate 1 to determine the picture area ratio for each ink key zone, and transports the printing plate 1 in the transport direction (Y direction). Plate conveying means A for carrying in the measuring means C, and width adjusting means B for positioning the printing plate 1 carried into the measuring means C by the plate conveying means A in a direction (X direction) orthogonal to the carrying direction; In the pattern area ratio measuring device provided with the above, since the reference guide 11 provided in the width shifting means B can be retracted to a predetermined position, the printing plate 1 after the width shifting is performed.
Is carried into the measuring means C, the edge 1a of the printing plate 1 and
The contact with the reference guide 11 can be released,
The generation of the kinetic frictional force due to the contact can be eliminated, and the printing plate 1 can be smoothly carried into the measuring means C without displacement.

[0056]

According to the picture area ratio measuring device of the present invention, the edge of the printing plate is brought into contact with the reference guide side by width adjustment to determine the position of the printing plate in the direction perpendicular to the conveying direction. When transporting the printing plate into C, the printing plate is not displaced as compared with the conventional case where the printing plate is transported in a state of being in contact with the reference guide side, and the effect of preventing the occurrence of measurement error by the measuring means is obtained. is there.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an embodiment of a picture area ratio measuring apparatus according to the present invention.

FIG. 2 is a schematic side view for explaining one embodiment of a picture area ratio measuring device of the present invention.

FIG. 3 is a partial front view illustrating an example of a relationship between a reference guide and a pusher in a structure of a width shifting unit of the picture area ratio measuring device of the present invention.

FIG. 4 is a partial front view illustrating another example of the relationship between the reference guide and the pusher in the structure of the width shifting means of the picture area ratio measuring device of the present invention.

FIG. 5 (a) is a front view showing another example of the retreat mechanism on the reference guide 11 side of the width shifting means B in the picture area ratio measuring device of the present invention. (B) It is a front view which shows the other example of the retraction | saving mechanism by the side of the reference guide 11 of the width | variety approach means B in the pattern area ratio measuring device of this invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Printing plate 2, 3 ... Guide roller 4, 5 ... Intermediate roller 6 ... Conveyor belt 11 ... X-direction reference guide 11a
Reference guide pin 12 Pusher 12a Pusher pin 13 Screw shaft 13a Screw 14 Guide shaft 15 Drive rotation means 16 Screw shaft 16a Screw 17 Guide shaft 18 Drive rotation means 19a, 19b Rotary encoder 21 ... Optical reading sensor 21a ... Reading sensor head 22,23 ... Reading and feeding control roller 24 ... Detection sensor 25 ... Detection sensor 26 ... Stopper 27 ... Detection sensor 36 ... Air cylinder 37 ... Guide shaft 38
... air cylinder 39 ... guide shaft 41 ... screw shaft 41b ... spline shaft 41c ...
Spline groove 42 ... Tapered surface 43 ... Rotating body 44 ... Bearing 45 ...
Gear 46 ... Gear 47 ... Gear 48 ... Electric motor 49 ... Fit hole 49
a: Fitting convex portion 51: Arm 52: Support shaft 53: Gear 54: Gear
55 ... drive source A ... plate feeding means B ... biassing means C ... picture pattern area rate measuring means F, perpendicular to the reference position X ... conveying direction in the _{F 1, F 2, F 3} ... apparatus body frame S ... X direction Direction Y: Transport direction

Claims (1)

(57) [Claims] 1. A measuring means for measuring the amount of reflected light of a printing plate to obtain a pattern area ratio for each ink key zone, a plate carrying means for carrying a printing plate into said measuring means, and a carrying means for carrying said printing plate into said measuring means. A width-measuring means for positioning the printing plate in a direction perpendicular to the carrying-in direction, wherein the width-measuring means is arranged to face the direction perpendicular to the carrying-in direction of the printing plate. And a reference guide and a pusher which respectively move closer to and away from each other, and the reference guide and the pusher press the printing plate side edge to shift the printing plate to the reference guide side and to adjust the loading direction. After the positioning operation is completed in the orthogonal direction, the reference guide and the pusher can be retracted to a predetermined position so that the printing plate does not contact the reference guide and the pusher.
A picture area ratio measuring device characterized in that the picture area ratio is transferred .