JPH0911443A - Device for winding in plate and printing plate - Google Patents

Abstract

PURPOSE: To provide a device for winding in a plate which makes removal and fitting of a printing plate smooth even when a printing plate fitting groove is set in a minimum gap for minimizing a nonprinting part and reducing an impact of rotation. CONSTITUTION: In a device for winding in a plate wherein a printing plate fitting groove 3 opening like a slit in the outer peripheral surface 9 of a plate cylinder 1 is formed in this cylinder 1 and wherein a winding-in shaft 7 is provided rotatably around its own central axis in the bottom part of the printing plate fitting groove 3 of the plate cylinder 1 and a bent piece 55 of the opposite end to a gripper end of a printing plate 51 is gripped by a slit-like groove 5 for fitting this opposite end, which is formed in the winding-in shaft 7, the end side of a second groove side 19 of the groove 5 which opens in the outer peripheral surface of the winding-in shaft is made a slant 21 slanting at a prescribed slant angle to the direction of the opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate winding device and a printing plate, and more particularly to a plate winding device and a printing plate for mounting a printing plate on a plate cylinder in an offset rotary printing machine.

[0002]

2. Description of the Related Art FIG. 7 shows a general structure of a conventional plate winding device. The plate winding device is composed of a plate mounting groove 3 formed in the plate cylinder 1 and a columnar winding shaft 7 having a plate biting tail mounting groove 5.

The plate mounting groove 3 extends in the direction normal to the plate bite head mounting groove side surface 13 which forms an acute angle θ with the outer peripheral surface 9 of the plate cylinder 1 and the outer peripheral surface 9 of the plate cylinder 1. And a side plate 15 for inserting a plate bite buttocks, which is opened in a slit shape along the generatrix direction of the outer peripheral face 9 to the outer peripheral face of the plate cylinder. 53 is inserted and the bite head bending piece 53 is hooked and locked by the plate bite head mounting groove side surface 13.

The plate bite end mounting groove 5 of the winding shaft 7 is
At a predetermined rotation angle position (rolling start rotation angle position), a predetermined interval is provided between the first groove side surface 17 and the first groove side surface 17 that is continuous with the plate biting edge insertion groove side surface 15 on one plane. And has a second groove side surface 19 facing each other, and opens in the winding shaft outer peripheral surface in a slit shape along the generatrix direction of the winding shaft outer peripheral surface.

At the winding start rotation angle position of the winding shaft 7, the biting tail bending piece 5 of the printing plate 51 is inserted into the plate biting tail mounting groove 5.
In the state in which 5 is inserted, the biting tail bending piece 55 is hooked with the first groove side surface 17 of the plate biting tail mounting groove 5 by being rotated in the clockwise direction in the drawing. Stop.

[0006]

In order to increase the printable area by reducing the non-printing area (non-printing area) by the plate mounting groove 3, and to reduce the impact due to the rotational relationship with the blanket cylinder, the printing is performed. Groove opening width t of the plate mounting groove 3
Is required to be as small as possible, but in the conventional plate winding device shown in FIG. 7, the groove opening width t of the plate mounting groove 3 is about 5 mm for attaching and detaching the plate 50. This is the limit, and the groove opening width t cannot be set to a narrow minimum gap of 1.5 mm or less.

In the conventional plate winding device shown in FIG. 7, when the groove opening width t of the plate mounting groove 3 is set to a minimum gap of 1.5 mm or less, the winding shaft is removed when the plate 51 is removed. When 7 is rotated in the counterclockwise direction, the opening of the plate attachment groove 3 becomes a bottleneck during extraction of the bite edge bent piece 55 from the plate attachment groove 3 and the bite edge bent piece 55 is removed. 8 is not smoothly extracted, and as shown in FIG. 8, the bite edge bending piece 55 becomes jammed in the plate mounting groove 3 and is bent and deformed in the plate mounting groove 3. .

In this way, when the biting tail bending piece 55 is bent and deformed, the biting tail bending piece 55 has to be forced out of the plate mounting groove 3 by force, and the plate 51 is very easily removed. It will be difficult.

[0009] Further, the biting tail bending piece 5 of the conventional printing plate 51
The shape of 5 is a combination of straight lines shown in FIG. 9 or a straight shape, and in the bite end bent piece 55 having such a shape, it is inserted into the plate mounting groove 3 of the minimum gap setting. Difficult to do.

The present invention has been made by paying attention to the above-mentioned problems, and in order to minimize the non-printing portion and to reduce the rotational impact, the printing plate mounting groove is set to a minimum gap, and the printing plate is set. It is an object of the present invention to provide a plate winding device and a printing plate that can be smoothly removed and attached.

[0011]

In order to achieve the above-mentioned object, a plate winding device according to claim 1 of the present invention is for mounting a plate bite head having an acute angle with respect to an outer peripheral surface of a plate cylinder. Slit-shaped on the outer peripheral surface of the plate cylinder along the generatrix direction of the outer peripheral surface having the groove side surface and the groove side surface for inserting the plate bite edge extending in the direction normal to the outer peripheral surface of the plate cylinder. A plate mounting groove opened in the plate cylinder is formed in the plate cylinder, and a cylindrical winding shaft extending in the axial direction of the plate cylinder is rotatable around the center axis of the plate cylinder at the bottom of the plate mounting groove of the plate cylinder. A first groove side surface continuous with the plate biting edge insertion groove side surface on a plane at a predetermined rotation angle position on the winding shaft, and a predetermined interval between the first groove side surface. The slit-shaped plate bite edge mounting groove formed by the side surface of the opposing second groove is opened on the outer peripheral surface of the winding shaft along the generatrix direction. In it formed the editions entrainment device is characterized in that the open end side is an inclined surface which is inclined at a predetermined inclination angle in the expanding direction to the winding shaft outer circumferential surface of the second groove flank.

According to a second aspect of the present invention, there is provided the plate winding device,
The plate winding device according to claim 1, wherein the inclined surface has a rotation angle position at which the plate bite tail mounting groove corresponds to the plate bite head mounting groove side surface, and the plate bite tail insertion. It is characterized in that the inclination angle is set so as to form a plane orthogonal to the side surface of the plate bite head mounting groove with respect to the rotation angle position corresponding to the side surface of the working groove.

According to a third aspect of the present invention, there is provided the plate winding device,
The plate winding device according to claim 1 or 2 is characterized in that a small inclined surface inclined at a predetermined inclination angle in the expansion direction is provided on the opening end side of the inclined surface.

In order to achieve the above-mentioned object, the plate according to claim 4 is such that a bite end bent piece of the plate inserted into a plate mounting groove formed in the plate cylinder is a straight line and a curved line. It is characterized by the combined shape of.

In order to achieve the above-mentioned object, the plate according to claim 5 is such that the biting tail bent piece of the plate inserted into the plate mounting groove formed in the plate cylinder has an arc shape. It is characterized by being.

In order to achieve the above-mentioned object, the plate according to claim 6 is such that the tip of the bite edge bent piece of the plate inserted into the plate mounting groove formed in the plate cylinder has a saw. It is characterized by a blade shape.

[0017]

In the plate winding device according to the first aspect, the opening end side of the second groove side surface of the plate bite tail mounting groove with respect to the winding shaft outer peripheral surface of only the winding shaft has a predetermined inclination angle in the expanding direction. Since it is an inclined surface, the biting tail bent piece of the printing plate hits the inclined surface by the rotation of the winding shaft when the plate is removed, and this biting tail bent piece is inserted from the plate mounting groove. It will be pushed in the direction to pull out. As a result, even if the plate mounting groove is set to have a narrow gap, the bite edge bent pieces will not be clogged in the plate mounting groove, and the bite edge bent pieces will be bent and deformed in the plate mounting groove. Is avoided.

In the plate winding device according to the second aspect, the inclination angle of the inclined surface of the plate biting tail mounting groove is the side surface of the plate biting head mounting groove of the plate cylinder. Between the rotation angle position corresponding to and the rotation angle position corresponding to the plate bite end insertion groove side surface of the plate cylinder, and is set to be a plane orthogonal to the plate bite head mounting groove side surface. Therefore, the direction in which the inclined surface pushes the bite edge bent piece by the rotation of the winding shaft and the direction in which the bite edge bent piece is pulled out from the plate mounting groove match, and the bite edge bent piece by the inclined surface Pressing is effectively done.

In the plate winding device according to the third aspect, a small inclined surface inclined at a predetermined inclination angle in the expanding direction is provided on the opening end side of the inclined surface of the plate bite edge mounting groove. This prevents the plate bite head from interfering with the inclined surface of the plate bite butt mounting groove due to the rotation of the winding shaft for removing the plate, and the plate bite head is bite butt. It is possible to prevent the bent pieces from being pulled out in competition with each other.

In the printing plate according to claims 4 and 5, since the biting end bent piece of the printing plate has a combination shape of straight lines and curved lines, or an arc shape, an extreme bending portion is formed on the biting tail bent piece. Even if the plate mounting groove is set to a minimum gap, the work of inserting the bite edge bent pieces into the plate mounting groove of the plate cylinder and the plate biting edge mounting groove of the winding shaft is performed smoothly. I will get it.

In the plate according to the sixth aspect, since the tip of the biting bottom bent piece of the printing plate has a sawtooth shape, the plate mounting groove of the biting tail bent piece and the plate biting tail Insertion into the mounting groove is now performed from the pointed peak of the sawtooth shape, and the work of inserting the bite edge bent piece into the plate mounting groove and the plate biting edge mounting groove can be performed smoothly. You will be able to break.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In the embodiment of the present invention, the same components as those of the above-mentioned conventional example are designated by the same reference numerals as those of the above-mentioned conventional example, and the description thereof will be omitted.

1 (a) to 1 (f) show an embodiment of a plate winding device according to the present invention. The plate mounting groove 3 of the plate cylinder 1 has a minimum gap. The groove opening width t of the plate mounting groove 3 by setting the minimum gap is 1.
It is 5 mm or less, for example, about 0.8 mm.

The second groove side surface 19 of the plate bite butt mounting groove 5 of the winding shaft 7 is a surface on the rotation direction delay side when the winding shaft is rotated when the plate is removed. An opening end side of the groove side surface 19 with respect to the winding shaft outer peripheral surface is an inclined surface 21 inclined with a predetermined inclination angle in the expansion direction.

As shown in FIG. 1 (b), the inclination angle of the inclined surface 21 corresponds to the groove 5 for mounting the plate biting tail edge and the groove side surface 13 for mounting the plate bite head on the plate cylinder 1. A groove for mounting the plate bite head between the rotation angle position and the rotation angle position corresponding to the plate bite bottom insertion groove side surface 15 of the plate cylinder 1 as shown in FIG. 1 (f). It is set to form a plane orthogonal to the side surface 13.

As shown in FIG. 1A, the printing plate 5
When the take-up shaft 7 is rotated counterclockwise from the state in which 1 is mounted on the plate cylinder 1, the state shown in FIG.
As shown in (c) and (d), the inclined surface 21 abuts on the biting tail bent piece 55 in the plate biting tail mounting groove 5,
As the winding shaft 7 rotates in the counterclockwise direction, the inclined surface 21 pushes the bite edge bent piece 55 in the direction to pull it out from the plate mounting groove 3.

As a result, even if the plate mounting groove 3 is set to the minimum gap, the bite edge bent piece 55 is pushed out of the plate mounting groove 3 without being blocked in the plate mounting groove 3.

In this case, the inclined surface 21 of the plate bite tail mounting groove 5 forms a plane orthogonal to the plate bite head mounting groove side surface 13 within the above-described rotation angle position range. Since the inclination angle is set, the direction in which the inclined surface 21 pushes the biting tail bent piece 55 by the rotation of the winding shaft 7 and the direction in which the bite tail bent piece 55 is pulled out from the plate mounting groove 3 are defined. It is effective to press the biting tail bent piece 55 by the inclined surface 21 effectively, and the biting tail bent piece 55 from the plate mounting groove 3 is effectively performed.
Is extruded well.

As a result, when the winding shaft 7 further rotates in the counterclockwise direction, the state shown in FIG. 1 (e) is changed to the state shown in FIG. 1 (d). FIG.
In the state shown in (e), the printing plate 51 is ready to be easily removed from the printing plate mounting groove 3 by the operator. In the state shown in FIG. Is ejected from the plate mounting groove 3 by its own spring action.

In the state shown in FIG. 1 (d), it is the same as the state in which the plate 51 is inserted into the plate mounting groove 3 and the plate bite butt mounting groove 5 of the plate bite butt mounting groove 5 is inserted. In this state, when the plate is inserted, the inclined surface 21 acts as a guide surface for guiding the bite butt bending piece 55 into the plate biting butt mounting groove 5, so that the biting butt bending piece 55 is pressed. The workability of inserting into the tail end mounting groove 5 is improved.

FIG. 2 shows another embodiment of the plate winding device according to the present invention. In this embodiment, a small inclined surface 23 is provided on the opening end side of the inclined surface 21 with a predetermined inclination angle in the expanding direction.

As shown in FIG. 2, due to improper typing of the bite head bent piece 53 or deformation during transportation, the bite head bent piece 53 floats up from the plate side bite head mounting groove side surface 13. Even if it is in the closed state, the small inclined surface 23 prevents the inclined surface 21 from catching the tip of the plate bite head 53 when the winding shaft 7 is rotated in the counterclockwise direction for removing the plate 51. At this time, the plate bite head 53 bites the bent bite 5
It is possible to prevent the action of pulling out by competing with the pulling out of 5.

As a result, even if the bite head bent piece 53 is in a state of being lifted from the plate bite head mounting groove side surface 13, the biting tail bent piece 55 is pushed out from the plate mounting groove 3. Is done well.

FIG. 3 shows an embodiment of the printing plate according to the present invention. The bite end bent piece 55 of the printing plate 51 is shaped in an arc shape.

4 (a) to 4 (e), a bite edge bent piece 55 shaped in an arc shape is inserted into the plate bite edge mounting groove 5 from the plate plate attachment groove 3 in which the minimum gap is set. It shows the process of printing.

Bite end bent piece 55 shaped in an arc shape
As shown in FIGS. 4 (a) and 4 (b), during the initial process of inserting from the plate mounting groove 3 into the plate bite bite mounting groove 5, the plate mounting groove 3 and the plate bite are inserted. It is oriented in the depth direction (insertion direction) of the tail end mounting groove 5. As a result, the plate mounting groove 3 is set to have a minimum gap, and even if the degree of freedom of deformation of the bite butt bending piece 55 in the plate mounting groove 3 is low,
The work of pushing the biting tail bent piece 55 from the plate mounting groove 3 into the plate biting tail mounting groove 5 can be performed smoothly.

The bite end bent piece 55 may be a combination of a straight line portion 55a and a curved line portion 55b as shown in FIG. 5 in addition to the arched shape, and in this case also. The same action and effect as those of the embodiment can be obtained.

The biting tail bent piece 55 as described above is modeled by a well-known plate type molder.
Is a circular arc shape or a shape of a combination of the straight line portion 55a and the curved portion 55b, it becomes possible to easily perform the molding by the plate molding machine.

FIG. 6 shows another embodiment of the printing plate according to the present invention.

In this embodiment, the tip of the bite edge bent piece 55 of the printing plate 51 is formed in a sawtooth shape.

When the tip of the biting tail bent piece 55 is formed in a sawtooth shape, the biting tail bent piece 55 is inserted into the plate mounting groove 3 and the plate biting tail mounting groove 5. It is performed from the pointed crest portion 55c having a saw-tooth shape, and the bite bottom bent piece 55 is attached to the plate mounting groove 3 and the plate bite tail mounting groove 5.
The work of inserting into can be performed smoothly.

For example, if the thickness of the plate 51 is 0.3 mm and the groove opening width of the plate mounting groove 3 is 0.8 mm,
At the time of inserting the bite end bent piece 55, the bite head bent piece 53 has already been inserted into the plate mounting groove 3, and therefore the remaining 0.5 m
It is necessary to insert a biting tail bent piece 55 having a thickness of 0.3 mm into the groove of m, but if the tip of the bited tail bent piece 55 is formed in a sawtooth shape as described above. , Bite buttocks bent piece 5
The work of inserting 5 into the plate attachment groove 3 and the plate bite edge attachment groove 5 can be performed without difficulty.

When the tip of the bite end bent piece 55 has a saw-toothed shape in this manner, only the portion of the crest portion 55c is an effective complete cross section, and the entire area of the printing plate 51 in the width direction is effective. However, since the ridges 55c cause the effective complete cross-sections to be present at a predetermined pitch in the width direction of the printing plate 51, the plate placement will not fail. In this case, it is preferable that both side edge portions of the printing plate 51 have a mountain portion 55c as shown in FIG. 6 so that an effective complete cross-section portion can be obtained at both side edge portions of the printing plate 51. .

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0046]

As can be understood from the above description, in the plate winding device according to the first aspect, even if the plate mounting groove is set to have the minimum gap, the bite-and-butt bent pieces are generated when the plate is mounted and removed. The plate mounting groove can be set to a minimum gap because it will not be clogged in the plate mounting groove and the bite edge bent pieces will not be bent and deformed in the plate mounting groove. In addition, the non-printing portion can be minimized to reduce the loss of the printing paper, the rotational impact can be reduced, and the occurrence of printing troubles such as shock eyes can be suppressed.

In the plate winding device according to the second aspect, by setting the inclination angle of the inclined surface of the groove for mounting the plate biting tail, the tilting surface is rotated by the rotation of the winding shaft so that the inclined surface pushes the bite tail bending piece and The tail edge bent piece is in the same direction as it is pulled out of the plate mounting groove, and the inclined surface effectively bites the tail edge bent piece, and bites even if the plate mounting groove is set to the minimum gap. The tail bent piece can be smoothly and surely pulled out from the plate mounting groove.

In the plate winding device according to the third aspect, since the small inclined surface is provided, the plate biting head is attached to the plate biting tail by the rotation of the winding shaft for removing the plate. Interference with the inclined surface of the groove is avoided, and the plate bite head is prevented from competing with the extraction of the biting tail fold and making the movement of extraction. As a result, even if the plate mounting groove is set to have the minimum gap, the bite edge bent piece can be smoothly and surely pulled out from the plate mounting groove.

In the printing plate according to claims 4 and 5, due to the shape of the bite edge bent piece of the plate, even if the plate attachment groove is set to the minimum gap, the bite edge bent piece is attached to the plate cylinder of the plate cylinder. The work of inserting the groove and the groove for mounting the plate bite end of the take-up shaft can be smoothly performed.

As a result, the plate mounting groove can be set to the minimum gap, the non-printing portion can be minimized to reduce the loss of the printing paper, and the rotational impact can be reduced to reduce the shock impact. The occurrence of printing troubles such as is suppressed.

In the printing plate according to the sixth aspect, insertion of the bite edge bent piece into the plate attachment groove and the plate bite edge attachment groove is performed from the pointed ridge portion of the sawtooth shape,
The work of inserting the bite edge bent piece into the plate mounting groove and the plate biting edge mounting groove can be performed smoothly, and in this case also the plate mounting groove can be set to the minimum gap As a result, the non-printing portion can be minimized to reduce the loss of the printing paper, the rotational impact can be reduced, and the occurrence of a print failure such as a shock eye can be suppressed.

[Brief description of the drawings]

1A to 1F are sectional views showing an essential part of an embodiment of a plate winding device according to the present invention.

FIG. 2 is a sectional view showing an essential part of an embodiment of a plate winding device according to the present invention.

FIG. 3 is a side view showing an essential part of an embodiment of a printing plate according to the present invention.

4 (a) to 4 (e) are cross-sectional views showing a plate mounting process of the printing plate according to the present invention.

FIG. 5 is a side view showing a main part of another embodiment of the printing plate according to the present invention.

FIG. 6 is a perspective view showing another embodiment of the printing plate according to the present invention.

FIG. 7 is a sectional view showing a general example of a conventional plate winding device.

FIG. 8 is a cross-sectional view showing an example in which the conventional plate winding device is directly set to the minimum gap.

FIG. 9 is a side view showing the shape of a bite edge bent piece of a conventional printing plate.

[Explanation of symbols]

 1 plate cylinder 3 plate mounting groove 5 plate bite butt mounting groove 7 winding shaft 9 outer peripheral surface 13 plate bite head mounting groove side surface 15 plate biting butt insertion groove side surface 17 first groove side surface 19 Second groove side surface 21 Sloping surface 51 Printing plate 53 Biting head bending piece 55 Biting tail bending piece 55a Straight portion 55b Curved portion 55c Mountain portion

Claims (6)

[Claims] 1. A groove side surface for mounting a plate bite head that makes an acute angle with the outer peripheral surface of the plate cylinder and a groove side surface for inserting a plate bite tail extending in a direction normal to the outer peripheral surface of the plate cylinder. A plate mounting groove having a slit-like opening along the generatrix of the outer peripheral surface of the plate cylinder is formed on the outer peripheral surface of the plate cylinder, and the plate is provided at the bottom of the plate mounting groove of the plate cylinder. A cylindrical winding shaft extending in the axial direction of the body is provided rotatably around its own central axis,
A first groove side surface continuous with the plate biting edge insertion groove side surface on a plane and a first groove side surface are opposed to the winding shaft at a predetermined rotation angle position with a predetermined interval. In a plate winding device in which a slit-shaped plate biting tail mounting groove formed by the second groove side surface is formed on the outer peripheral surface of the winding shaft along the generatrix direction, the second groove side surface A plate winding device, wherein the opening end side with respect to the outer peripheral surface of the winding shaft is an inclined surface inclined at a predetermined inclination angle in the spreading direction. 2. The inclined surface has a rotation angle position in which the plate bite tail mounting groove corresponds to the plate bite head mounting groove side surface and a rotation corresponding to the plate bite tail insertion groove side surface. 2. The plate winding device according to claim 1, wherein the inclination angle is set so as to form a plane orthogonal to a side surface of the plate bite head mounting groove between the plate and the angular position. 3. The plate winding device according to claim 1, wherein a small inclined surface inclined at a predetermined inclination angle in the spreading direction is provided on the opening end side of the inclined surface. 4. A printing plate, characterized in that the bite edge bent piece of the printing plate inserted into the plate mounting groove formed in the plate cylinder has a combined shape of straight lines and curved lines. 5. A printing plate, characterized in that a bite edge bent piece of the printing plate inserted into a plate mounting groove formed in the plate cylinder has an arc shape. 6. A printing plate characterized in that a tip of a bite edge bent piece of the printing plate inserted into a plate mounting groove formed in the plate cylinder has a sawtooth shape.