JP3463973B2 - Plate cassette - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate cassette, and more particularly, to a printing plate supply device for sequentially supplying a plurality of printing plates to an exposure device, the plate supply device being inclined with respect to the horizontal direction. , A printing plate cassette for storing the plurality of printing plates.

[0002]

2. Description of the Related Art In recent years, an image recording apparatus for recording an image on a printing plate (hereinafter referred to as a printing plate) by irradiating a laser beam has been widely used. In this type of image recording apparatus, a printing plate in which a photosensitive material is applied to one surface of a thin aluminum plate is often used. The surface of the printing plate on which the photosensitive agent is applied (hereinafter referred to as the photosensitive surface) is scanned by the laser beam to be exposed to light, and an image is recorded there.
The processing capability of the image recording apparatus has been improved year by year, and accordingly, the plate supply apparatus for supplying the plate to the image recording apparatus is also required to have higher reliability.

The plate supply device is provided with a detachable container (hereinafter referred to as a plate cassette) for storing a predetermined number of plate bundles. The plate supply device repeats the operation of taking out the plate one by one from the plate cassette and supplying it to the image recording device.

By the way, a slip sheet for protecting the photosensitive surface of the printing plate is usually inserted between the printing plates housed in the printing plate cassette. Therefore, the plate supply device needs to remove the interleaving paper adhering to the upper surface of the plate to be taken out, and then take out the plate from the plate cassette. In the plate supply device in which the plate cassette is installed to be inclined with respect to the horizontal direction in order to save space, conventionally, for example, the interleaving paper is scraped off by a roller or the interleaving paper is blown off by ejecting air. It was

However, in any case, since a dedicated interleaf sheet removing mechanism for scraping or blowing off the interleaf sheet is provided, there is a problem that the construction of the plate supply device becomes complicated. Further, when the interleaving paper is scraped off, the photosensitive surface of the printing plate may be scratched, or dust and paper dust blown up by the air may adhere to the photosensitive surface, resulting in deterioration of image quality.

Therefore, the plates and slip sheets stored in the plate cassette are sequentially taken out from the topmost one,
If it is a printing plate, it is conveyed to the exposure device side via the plate conveyance route, and if it is interleaf, it is conveyed to the collection box side via the interleaf conveyance route. Such a new plate supply device has been devised.

FIG. 11 is a sectional view showing an example of a main part of a newly devised printing plate supply device. The plate to be supplied by the apparatus of FIG. 11 is an aluminum-based plate. Figure 1
The exposure device (not shown) provided adjacent to the first device is provided with an exposure table that can be moved back and forth.
The printing plate supplied by the apparatus of FIG. 11 is fixed on the exposure table and moved at a predetermined speed. that time,
The plate is exposed to light by being scanned in a plane by a laser beam. The exposed printing plate is further discharged to the developing device (not shown) and developed.

In FIG. 11, the plate supply device includes a plate cassette 1101, a suction pad 1102, and a metal sensor 11.
03, route switching guide 1104, guide 1105-
1108, conveyor belt 1109, nip roller 11
10, plate discharge roller 1111 and slip sheet discharge roller 1
112 and a recovery box 1113 are provided. The plate cassette 1101 is a detachable box body, and an openable and closable shutter (not shown) is provided on the upper surface thereof.

The suction pad 1102 is driven by a motor (not shown) to sequentially take out the printing plates and the interleaf sheets stored in the printing plate cassette 1101 from the topmost one. The transport belt 1109, the guides 1105 and 1106, and the plate discharge roller 1111 constitute a plate transport path (reference numbers are not given to the plate transport path). The guides 1107 and 1108 and the slip sheet discharge roller 1112 form a slip sheet conveyance path (reference numeral is not given to the slip sheet conveyance path).

The metal sensor 1103 inspects the thin plate taken out to detect the metal material. The path switching guide 1104 is driven by a solenoid (not shown),
Depending on the detection result of the metal sensor 1103, the position shown by the solid line (position for printing plate) and the position shown by the dotted line (position for slip sheet) are moved to each other. As a result, when the taken out thin plate is a printing plate, the printing plate transport path is opened and the interleaf paper transport path is closed. On the other hand, in the case of interleaf paper, the interleaf paper transport path is opened and the printing plate transport path is closed.

The nip roller 1110 is driven by a motor (not shown) to move between a position indicated by a solid line and a position indicated by a dotted line. Conveyor belt 110
9 is driven by a motor (not shown) to advance in the direction indicated by an arrow in the figure. Plate discharge roller 111
1 and the slip sheet discharge roller 1112 rotate in the directions indicated by arrows by being driven by a motor (not shown).

The operation of the plate supply device shown in FIG. 11 will be described below. Now, the plate cassette 1101 is shown in FIG.
Has been removed from the body of the device, for example 5
About 0 aluminum-based printing plates are stored with their photosensitive surfaces facing upward. An interleaving paper for protecting each photosensitive surface is sandwiched between the printing plates. The shutter provided on the upper surface of the plate cassette 1101 is in a closed state to shield light. First, the operator inserts the plate cassette 1101 into FIG.
Attach it to the main body (inclined with respect to the horizontal direction) as shown in.

When the operator turns on a power source (not shown), the shutter is first opened. Next, suction pad 1
The motor 102 is driven by a motor (not shown) and moves from a position shown by a solid line to a position shown by a dotted line. Then, when suction is started and the plate is gripped by the suction pad 1102, the suction pad 1102 is driven by a motor (not shown) again and moves to the position indicated by the solid line.

When the suction pad 1102 moves to the position indicated by the solid line, the metal sensor 1103 inspects the printing plate taken out by the suction pad 1102. As a result of the inspection, a metal material is detected, so the route switching guide 1104
Is driven by a solenoid (not shown) to move to a position (printing plate position) indicated by a solid line. At the same time, nip roller 1
110 is moved to a position indicated by a dotted line by being driven by a motor (not shown).

Conveyor belt 1109 and nip roller 1
The printing plate taken out by the suction pad 1102 is sandwiched between 110 and 110. Next, the suction pad 1102 stops suction and retracts to a position where it does not touch the printing plate. When the taken-out printing plate is thus held only by the carrying belt 1109 and the nip roller 1110, the carrying belt 1109 starts moving in the direction indicated by the arrow in the drawing, and the printing plate is held vertically. It is sent upward.
When the printing plate is delivered, the nip roller 1110
It is moved to the position indicated by the solid line again by being driven by a motor (not shown).

Since the path switching guide 1104 is at the position indicated by the solid line (printing plate position), the sent printing plate is accompanied by the movement of the conveyor belt 1109 and the guide 1
While being supported by 105 and 1106, they are conveyed toward the plate discharge roller 1111. The plate discharge roller 1111 is rotated in the direction shown by the arrow in the figure by being driven by a motor (not shown). The conveyed printing plate is nipped by the plate discharging roller 1111 and discharged to the exposure device side provided in front of it. This completes the supply of the first printing plate.

Next, the suction pad 1102 is driven by a motor (not shown) and moves from the position indicated by the solid line to the position indicated by the dotted line. Then, suction is started, and the interleaf paper is sucked by the suction pad 110.
When gripped by 2, the suction pad 1102 is driven again by a motor (not shown) and moves to the position indicated by the solid line.

When the suction pad 1102 moves to the position indicated by the solid line, the metal sensor 1103 inspects the interleaved paper taken out. As a result of the inspection, since the metal material is not detected, the path switching guide 1104 is driven by the solenoid (not shown) and moves to the position shown by the dotted line (position for slip sheet). At the same time, the nip roller 1110 is driven by a motor (not shown) to move to the position indicated by the dotted line.

Conveyor belt 1109 and nip roller 1
The interleaving paper taken out by the suction pad 1102 is sandwiched between 110 and 110. Next, the suction pad 1102 stops suction and retracts to a position where it does not touch the slip sheet. When the taken-out interleaving paper is thus held only by the carrying belt 1109 and the nip roller 1110, the carrying belt 1109 starts moving in the direction indicated by the arrow in the drawing, and the interleaving paper is vertical. It is sent upward. When the delivery of the slip sheet is completed, the nip roller 1110 is driven by a motor (not shown) to move to the position indicated by the solid line again.

Since the path switching guide 1104 is located at the position indicated by the dotted line (position for slip sheet), the slip sheet sent out is bent in the advancing direction thereof, and thereafter is supported by the guide 1107 and is moved to the slip sheet discharging roller 1112 side. Be transported. The slip sheet discharging roller 1112 is rotated in the direction indicated by the arrow by being driven by a motor (not shown). The conveyed interleaf paper is sandwiched between the interleaf paper discharge rollers 1112, and further discharged to the collection box 1113 side via the guide 1108. The ejected interleaving paper is collected in the recovery box 111 by its own weight.
It drops from the open upper surface of 3 toward the inner bottom. With the above, the collection of the first slip sheet is completed.

Next, the second printing plate is supplied in the same manner as above, and the second interleaf sheet is recovered in the same manner as above. After that, by repeating the same operation, the printing plate supply device of FIG. 11 can sequentially supply the printing plates to the exposure device while collecting the interleaving paper sandwiched between the printing plates.

As described above, in the apparatus of FIG. 11, the interleaving paper is sucked by the suction pad 1102 and taken out from the printing plate cassette 1101 similarly to the printing plate. Therefore, the interleaving paper is scraped off by the rollers or air is blown. Compared with the case where a dedicated interleaf sheet removing mechanism that ejects toward the interleaf sheet is provided, the configuration of the device is simpler. Further, the photosensitive surface is not scratched as in the case of scraping off the interleaving paper with the rollers, and dust and paper dust are not soared up as when air is jetted toward the interleaving paper.

[0023]

However, it has been clarified that the apparatus shown in FIG. 11 has the following inconveniences depending on the type of interleaving paper. That is, in the above-described feeding operation, immediately after the uppermost printing plate is taken out of the printing plate cassette 1101, the next slip sheet slides along the next printing plate, and the slip sheet is conveyed correctly. It is inconvenient that it is not done. Many interleaving papers rarely slip off due to surface roughness or static electricity, but some interleaving papers have coatings or anti-static treatments on their surfaces. In such cases, slippage of the interleaf paper often occurs.

Therefore, an object of the present invention is to install the printing plates and the interleaving sheets, which are alternately superposed on each other, in a tilted manner with respect to the horizontal direction in a printing plate supply device for sequentially taking out and supplying the printing plates and the interleaving paper. It is an object of the present invention to provide a printing plate cassette that stores interleaving paper and can prevent the stored topmost interleaving paper from sliding down along the next printing plate.

[0025]

Means for Solving the Problems and Effects of the Invention According to the first aspect of the present invention, the printing plates and the interleaving sheets alternately stacked are sequentially taken out to supply the printing plates to the exposure device and collect the interleaving sheets. A plate cassette for mounting the plate and interleaving paper, which is mounted on the plate supply device at an angle with respect to the horizontal direction, and has an end portion located on the upper side when mounted on the plate supply device. In the vicinity, a slip-prevention mechanism is provided to prevent the interleaf paper from sliding down along the next printing plate by pressing the stored top interleaf paper.

As described above, in the first aspect of the invention, since the slip prevention mechanism for pressing the uppermost interleaf sheet is provided in the vicinity of the end located on the upper side when mounted on the plate feeding apparatus, the interleaf sheet is provided. Are prevented from sliding down the next plate.

According to a second aspect of the present invention, in the first aspect, the slip-prevention mechanism includes an arm that is rotatably supported about one end of the anti-slip mechanism and that has a pressing member at the other end, and a pressing member. It includes a coil spring for rotating the arm in such a direction as to press the paper.

As described above, in the second aspect of the invention, since the anti-slip mechanism is realized by the rotatable arm provided with the pressing member and the coil spring for rotating the arm, the structure of the cassette is simple. As a result, the price is low and there are few failures. In addition, since the stroke of the pressing member increases in proportion to the length of the arm, a large number of printing plates can be stored in the cassette, and the interleaving paper can be evenly distributed regardless of the number of remaining printing plates in the cassette. It can be held down by force.

In a third aspect based on the second aspect, the arm is provided parallel to a vertical plane including the sides of the interleaving paper,
The holding member is characterized by being provided perpendicular to the arm.

As described above, in the third aspect of the invention, the arm is provided in parallel with the vertical plane including the sides of the slip sheet, and the pressing member is provided perpendicularly to the arm. The space provided may be small, resulting in
The size of the cassette becomes smaller.

A fourth invention is characterized in that, in the second invention, the arm is provided so as to be inclined with respect to a vertical plane including a side of the interleaving paper.

As described above, according to the fourth aspect of the invention, since the arm is provided so as to be inclined with respect to the vertical plane including the side of the interleaf sheet, the pressing member has a function that the arm is lifted upward. Also move horizontally away from the plate. Therefore, the pressing member is easily separated from the slip sheet or the printing plate that is being taken out, and the slip prevention mechanism does not interfere with the take-out operation (of the printing plate or the slip sheet) of the plate supply device. Further, the pressing member does not become a hindrance when the plate is set in the cassette, and the operator can easily set the plate.

A fifth invention is characterized in that, in the second invention, the pressing member is a leaf spring.

As described above, in the fifth invention, since the leaf spring is used as the pressing member, the end portion of the arm is lifted and the end portion of the leaf spring is lifted as the interleaving paper or the printing plate is taken out. It lifts further from there. Therefore, when the interleaving paper or the printing plate held by the holding member is taken out, the holding member is easily separated from the interleaving paper or the printing plate.

The sixth invention is characterized in that, in the fifth invention, the spring constant of the leaf spring is smaller than the spring constant of the coil spring.

As described above, in the sixth aspect of the invention, the spring constant of the leaf spring is smaller than the spring constant of the coil spring, so that the end of the leaf spring is larger than the end of the arm. Since the arm is longer and heavier between the arm and the leaf spring, the end of the leaf spring is lifted more than the end of the arm so that the lifted end of the leaf spring separates from the printing plate. The time required to return to the position where the slip sheet is located is shortened. As a result, the next slip sheet can be pressed quickly (before the start of sliding).

A seventh invention is characterized in that, in the second invention, the pressing member is a plurality of coil springs arranged in parallel with each other.

As described above, in the seventh invention, since the plurality of coil springs arranged in parallel to each other are used as the pressing member, the pressing member is more likely to be twisted than in the case of using the leaf spring. In that case, even if the printing plate (or slip sheet) that is being taken out is deformed, the pressing member is twisted along the deformed printing plate, so that the end of the pressing member is prevented from being caught by the printing plate. .

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a printing plate cassette according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the long side direction of the cassette of FIG. The cassette of FIG. 1 is mounted in place of the plate cassette 1101 in the plate supply apparatus of FIG. 11, and stores, for example, an aluminum-based plate. A slip sheet is sandwiched between the printing plates to be stored.

1 and 2, a shutter 102 that can be opened and closed is provided on the open upper surface of the box body 101. Further, guides 103a to 103d for positioning the printing plates are provided at the four corners of the inner bottom surface of the box body 101, and the uppermost interleaf paper slides down along the next printing plate in the guides 103a and 103b. Anti-slip mechanisms 104a and 104b are provided to prevent this.

The cassette shown in FIG. 1 is attached to the apparatus shown in FIG. 11 (inclined with respect to the horizontal direction) so that the end portions provided with the guides 103a and 103b are on the upper side. It should be noted that the operation of the plate supply apparatus in FIG. 11 for taking out the plate and the slip sheet from the cassette in FIG. 1, transporting the plate to the exposure device side, and transporting the slip sheet to the collection box side is the same as in the conventional technique. It is the same as that described in the item.

FIG. 3 is a perspective view showing details of the slip prevention mechanism 104a of FIG. The mechanism of FIG.
1 and an arm 302. Bracket 301
Is fixed to the guide 103a in FIG.
Are rotatably supported by the bracket 301 about the pin 303. The direction of the arm 302 is parallel to the vertical plane including the long side of the slip sheet (or printing plate). A coil spring 304 is attached to the pin 303 so as to be wound around it.
(Torsion spring) is provided.

The elasticity of the coil spring 304 gives a rotational force to the arm 302, and as a result, the arm 302 is rotated.
A leaf spring 305 provided perpendicularly to the arm 302 at the end of the sheet presses down the topmost interleaf sheet (or printing plate) stored in the cassette of FIG. On the lower surface of the end portion 305a of the leaf spring 305, a projection (not shown) having a rough surface is provided. In addition, the slip prevention mechanism 10 of FIG.
4b has a configuration symmetrical to the slip-prevention mechanism 104a.

When the cassette of FIG. 1 provided with such a slip prevention mechanism 104a (and 104b) is mounted on the plate supply apparatus of FIG. 11 (instead of the plate cassette 1101), the end of the leaf spring 305 is removed. The frictional force between the protrusions provided on the lower surface of the portion 305a and the interleaf sheet prevents the topmost interleaf sheet stored from slipping off.

By the way, the arm 302 is provided parallel to the vertical plane including the long side of the printing plate, and a plate material (here, the leaf spring 30 is provided at the end of the arm 302 at a right angle to the arm 302.
The reason why 5) is provided is as follows. That is, since the stroke of the plate material is proportional to the length of the arm 302, if a large number of printing plates are accommodated and the interleaving paper is pressed with a uniform force regardless of the number of remaining printing plates, the length of the arm 302 is increased. And the size of the cassette increases. In the mechanism shown in FIG. 3, the arm 302 is provided parallel to the vertical plane including the long side of the printing plate, and the arm 3 is provided at the end of the arm 302.
Since the plate material is provided at a right angle to 02, the space for providing the mechanism of FIG. 3 may be small even if the number of plates to be stored is large, and the size of the cassette does not become large.

The plate spring provided at the end of the arm 302 is the plate spring 305 for the following reason. That is, the mechanism of FIG. 3 presses the topmost interleaving paper stored in the cassette of FIG. 1 so as not to slip, but when the printing plate (or interleaving paper) is taken out of the cassette of FIG. , Should not be an obstacle to taking out.

When the plate spring 305 is used as the plate member provided at the end of the arm 302, the plate spring 305 is bent by being pushed by the plate when the uppermost plate is taken out, and as a result, the plate spring 305. Since the end portion 305a of the plate is easily separated from the printing plate, it does not hinder the transport of the printing plate.

Further, in that case, the leaf spring 305 has a spring constant smaller than that of the coil spring 304 but large enough to prevent slippage of the slip sheet, thereby preventing slippage of the slip sheet. Moreover, the leaf spring 305
The edge portion 305a of the sheet can be quickly separated from the interleaving paper (or the printing plate) that was being pressed. The details will be described below with reference to FIG.

FIG. 4 is a view showing a state in which, when the cassette of FIG. 1 is mounted on the plate supply device of FIG. 11, the uppermost plate contained therein is taken out. 4A is a side view taken along the arrow A in FIG. 3, and FIG. 4B is a side view taken along the arrow B. The leaf spring 305 has a spring constant smaller than that of the coil spring 304 (however, large enough to prevent slippage of the slip sheet).

In FIG. 4 (1), the end 302a of the arm 302 is lifted as the plate moves, and the end 305a of the leaf spring 305 is further lifted from there.
Therefore, the end portion 305a of the plate spring 305 is easier to separate from the printing plate than when a plate material that is difficult to bend is provided on the arm 302.

As can be seen from FIG. 4 (2),
When the spring constant of the leaf spring 305 is smaller than the spring constant of the coil spring 304, the lifting amount is the leaf spring 30.
The end portion 305a of No. 5 is larger than the end portion 302a of the arm 302. Since the arm 302 is longer and heavier between the arm 302 and the leaf spring 305, the end portion 30 of the leaf spring 305 is reduced.
By making the arm 5a lift larger than the end 302a of the arm 302, it is possible to shorten the time required for the end 305a to move away from the printing plate and return to the position of the next slip sheet, and as a result, The paper can be pressed quickly (before the start of sliding).

The cassette of FIG. 1 may be provided with another slip prevention mechanism as shown in FIG. 5 instead of the slip prevention mechanism 104a (mechanism of FIG. 3). The mechanism of FIG. 5 has a weight 5 in place of the coil spring 304 in the mechanism of FIG.
It is equipped with 01. In the mechanism of FIG. 5, the coil spring 304
Instead of applying the rotational force to the arm 302 by the elasticity of, the weight of the weight 501 applies the rotational force to the arm 302. In the mechanism of FIG. 3, the coil spring 304 becomes fatigued as the use time becomes longer, but the mechanism of FIG. 5 does not have such a fear.

Further, the cassette of FIG. 1 may be provided with another slip prevention mechanism as shown in FIG. 6 instead of the slip prevention mechanism 104a. The mechanism of FIG. 6 is different from the mechanism of FIG. 3 in that instead of the arm 302 and the leaf spring 305,
A leaf spring 601 having an integrated shape is provided. The mechanism of FIG. 6 has an advantage that the number of parts is smaller than that of the mechanism of FIG.

Further, the cassette of FIG. 1 may be provided with another slip prevention mechanism as shown in FIG. 7 in place of the slip prevention mechanism 104a. The mechanism of FIG. 7 includes a bracket 701 instead of the bracket 301 in the mechanism of FIG. In the bracket 701, the leg portion 701a is longer than the leg portion 701b, and when the bracket 701 is fixed to the guide 103a in FIG. 1, the arm 302 is inclined at a predetermined angle (for example, 10 degrees) with respect to the printing plate. . Therefore, the leaf spring 305 moves horizontally away from the printing plate as the arm 302 lifts upward, and as a result, the end portion 305a of the leaf spring 305 separates from the printing plate. Will be easier. When the arm 302 is rotated 180 ° in the direction opposite to the direction in which the plate is pressed, the operator can easily perform the setting work when setting the plate in the cassette. It is needless to say that the mechanism shown in FIG. 5 or 6 may include a bracket 701 instead of the bracket 301.

Further, in the mechanism of FIG. 7, as shown in FIG. 8, instead of the leaf spring 305, a plurality (two in FIG. 8) of coil springs 801 and a holding plate 802 may be provided. Two coil springs 80 provided in parallel in FIG.
1 and the leaf spring 305 in FIG. 7, assuming that the spring constants in the bending direction are equal to each other, the spring constant in the twisting direction is that the two coil springs 801 provided in parallel are the leaf springs. It becomes smaller than 305. for that reason,
Presser plate 8 provided at the ends of two coil springs 801
02 rotates more easily than the end portion 305a of the leaf spring 305.

The printing plate (or slip sheet) being taken out is usually deformed as shown in FIG. 11, for example. In the mechanism of FIG. 8, the two coil springs 801 are twisted according to the deformed plate (or slip sheet) shape, and as a result, the pressing plate 802 rotates along the plate, so that the pressing plate 80 is rotated.
2 is prevented from being caught on the printing plate.

Further, the cassette of FIG. 1 may be provided with another slip-prevention mechanism as shown in FIG. 9 instead of the slip-prevention mechanism 104a. The mechanism of FIG. 9 includes pins 901 and 902 and a coil spring 903 (pull spring) in place of the coil spring 304 in the mechanism of FIG. The pin 901 is provided on the arm 302 side, the pin 902 is provided on the bracket 301 side, and the coil spring 903 is provided.
Pulls these pins 901 and 902 in directions toward each other. Thereby, a rotational force is applied to the arm 302.

In the mechanism of FIG. 9, as shown in FIG. 10, the positional relationship between the pins 303, 901 and 902 is the arm 30.
It changes according to the position of 2. When the arm 302 is in the position shown in the upper part of FIG. 10, the arm 302 is given a rotational force in the clockwise direction toward the paper surface to press the printing plate. On the other hand, when the arm 302 is in the lower position, the arm 302 is
It is given a rotational force counterclockwise and stops at that position.

That is, in the mechanism of FIG. 9, when setting the printing plate, once the arm 302 is lifted to the position shown in the lower part of FIG. 10, the arm 302 remains at that position even if the operator releases his hand. . Therefore, the operator can easily set the printing plate. It is needless to say that the mechanism of FIGS. 6 to 8 may be provided with the pins 901 and 902 and the coil spring 903 instead of the coil spring 304.

[Brief description of drawings]

FIG. 1 is a perspective view showing a printing plate cassette according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the cassette of FIG. 1 taken along the long side direction.

FIG. 3 is a perspective view showing details of a slip prevention mechanism 104a in FIG.

FIG. 4 is a diagram showing a state in which, when the printing plate cassette of FIG. 1 is mounted on the printing plate supply device of FIG. 11, the topmost printing plate or slip sheet stored therein is taken out.

FIG. 5 is a schematic view of the cassette of FIG.
It is a perspective view which shows the other slip prevention mechanism provided instead of a (mechanism of FIG. 3).

FIG. 6 is a schematic view of the cassette of FIG.
It is a perspective view which shows another slide-off prevention mechanism provided instead of a.

FIG. 7 is a schematic view of the cassette of FIG.
It is a perspective view which shows another slip-down prevention mechanism provided instead of a.

8 is a diagram showing the mechanism of FIG. 7, in which instead of the leaf spring 305,
It is a figure (top view) showing what provided two coil springs and a control board.

9 is a diagram showing the slide prevention mechanism 104 in the cassette of FIG.
It is a perspective view which shows another slide prevention mechanism provided instead of a.

FIG. 10 is a view for explaining that the direction of the rotational force applied to the mechanism of FIG. 9 changes depending on the position of the arm 302.

FIG. 11 is a sectional view showing an example of a main part of a newly devised plate supply device.

[Explanation of symbols]

101 Box 102 shutter 103a-103d guide 104a, 104b Anti-slip mechanism 301, 701 bracket 302 Arm 303, 901, 902 pin 304, 801, 903 coil spring 305, 601 leaf spring 501 weight 802 holding plate

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-12027 (JP, A) JP-A-61-124451 (JP, A) JP-A-10-273242 (JP, A) Actual development Sho-57- 126450 (JP, U) Actually open 61-59225 (JP, U) Actually open 61-78147 (JP, U) Actually public 45-32928 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 3/54 310 B41C 1/00 B65D 83/08

Claims (7)

(57) [Claims] 1. A printing plate supply device for sequentially taking out alternately stacked printing plates and interleaving papers to supply the printing plates to an exposure device and collecting the interleaving papers while being inclined with respect to the horizontal direction. Is
A printing plate cassette for storing the printing plates and interleaving paper, by pressing the topmost interleaving paper stored near the end located on the upper side when mounted on the printing plate feeding device. A printing plate cassette provided with a slip prevention mechanism for preventing the slip sheet from sliding down along the next printing plate. 2. The anti-slip mechanism has an arm that is rotatably supported about one end thereof and has a pressing member at the other end, and an orientation in which the pressing member presses the slip sheet. The printing plate cassette according to claim 1, further comprising a coil spring for rotating the arm. 3. The arm is provided in parallel with a vertical plane including a side of the slip sheet, and the pressing member is provided perpendicular to the arm. The printing plate cassette described in. 4. The printing plate cassette according to claim 2, wherein the arm is provided so as to be inclined with respect to a vertical plane including a side of the slip sheet. 5. The printing plate cassette according to claim 2, wherein the pressing member is a leaf spring. 6. The spring constant of the leaf spring is smaller than the spring constant of the coil spring.
The printing plate cassette described in. 7. The printing plate cassette according to claim 2, wherein the pressing member is a plurality of coil springs arranged in parallel with each other.