JP3125749U - Intermittent rotary offset printing apparatus and plate cylinder for intermittent rotary offset printing apparatus - Google Patents

Abstract

An intermittent rotary offset printing apparatus capable of replacing a printing plate in a short time.
A winding start end (36a) of a printing plate (36) is fixed to a plate cylinder main body (35), the printing plate (36) is wound around the plate cylinder main body (35), tension is applied to the printing plate (36), and a winding end (36b) is connected to the plate cylinder main body. In the intermittent rotary offset printing apparatus fixed to 35, a printing plate fixing portion 35a that is recessed as required from the plate cylinder main body circle S is formed on one side of the plate cylinder main body 35, and printing is performed on one side of the printing plate fixing portion 35a. A first fixing means 50 for fixing the winding start end 36a of the plate 36 is provided. The first fixing means 50 has a plurality of positioning pins 53 that are separated from each other in the direction of one generatrix of the plate cylinder main body 35. The winding start end 36a of the printing plate 36, which is positioned by engaging a plurality of positioning notches formed at the winding start end 36a of the printing plate 36, is fixed.
[Selection] Figure 4

Description

  The present invention relates to an intermittent rotary offset printing apparatus and a plate cylinder for an intermittent rotary offset printing apparatus suitable for label printing and other printing in which the length in the printing direction (repeat length) is extremely short.

  2. Description of the Related Art Conventionally, a plate mounting structure in a plate cylinder in an intermittent rotary offset printing apparatus includes a first fixing unit that is provided on the plate cylinder and fixes a winding start end of a printing plate wound around the plate cylinder, and the plate cylinder. After the winding start end of the printing plate is fixed by the first fixing means, the winding end end of the printing plate is supported and tension is applied to the printing plate to fix the winding plate around the plate cylinder. Second fixing means. This structure is the same as that of the conventional offset printing apparatus.

FIG. 5 shows a mounting structure of a printing plate on a plate cylinder in a conventional offset printing apparatus (see Patent Document 1).
The plate cylinder 10 shown in FIG. 5 has a double shaft structure in which an inner shaft 11 and an outer cylinder 12 are fixed integrally. The outer cylinder 12 has a wedge-shaped edge 12a having a thin slit in one direction in the circumferential direction and one end facing the slit having an inwardly inclined surface of 45 °, and the wedge-shaped edge 12a. Is the first fixing means. The inner shaft 11 has a recess 11a at a lower position corresponding to the slit of the outer cylinder 12, and a reel rod 13 as a second fixing means is provided in the recess 11a.
In the printing plate 14, the winding start end and the winding end end are each folded back at an acute angle of 45 ° on the winding surface side of the plate cylinder 10 to form a first hook portion 14a and a second hook portion 14b. The hooking portion 14a is hooked on the wedge-shaped edge portion 12a of the outer shaft 12, and then the printing plate 14 is wound around the plate cylinder 10, and the winding end of the printing plate 14 is folded at an acute angle so as to be 45 °. Then, the second hooking portion 14b is inserted into the slit of the reel rod 13, and then the reel rod 13 is rotated in the direction in which the printing plate 14 is wound to apply tension to the printing plate 14 and wind it tightly around the outer cylinder 12. I was in a state.
The intermittent rotary offset printing apparatus is the same as the plate mounting structure shown in FIG.
Japanese translation of PCT publication No. 2000-508983 FIG.

In the label printing by the intermittent rotary offset printing apparatus, the positioning of the printing plate in the plate cylinder needs to suppress the deviation in the circumferential direction and the generatrix direction of the plate cylinder to about 10 microns or less respectively. Deviation occurs and print quality decreases. Therefore, the positioning of the printing plate is accurately performed over time. In recent years, various automatic plate changing apparatuses that automatically change the printing plate have been proposed, but have not yet been put into practical use.
In the conventional plate mounting structure shown in FIG. 6, it is difficult to precisely position the plate, and it takes time to replace the plate, so that the operating rate of the printing apparatus cannot be increased. Accordingly, there has been a demand for an improvement in the operating rate of the printing apparatus in order to reduce printing costs in response to printing needs for small lots.

  The purpose of the present invention has been made in view of the above-mentioned points, can replace the printing plate in a short time, and can increase the operating rate of the printing apparatus according to the printing needs of a small lot. An object is to provide an intermittent rotary offset printing apparatus and a plate cylinder for the intermittent rotary offset printing apparatus.

In order to achieve the above object, the intermittent rotary offset printing apparatus of the present invention secures the winding start end of the printing plate to the plate cylinder body, winds the printing plate around the plate cylinder body, and applies tension to the printing plate. In the intermittent rotary offset printing apparatus for fixing the end edge to the plate cylinder main body, a plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and one side of the plate fixing portion The first fixing means for fixing the winding start end of the printing plate and the second fixing means for fixing the winding end end of the printing plate on the other side are provided on the other side of the plate cylinder main body. A plurality of positioning pins that are separated in the direction of the bus line are provided, and a plurality of positioning notches formed on the winding start end of the printing plate are engaged with the positioning pins to fix the winding start end of the printing plate. It is comprised as follows.
According to the above configuration, the winding start end of the printing plate to be positioned is fixed by engaging a plurality of positioning notches formed at the winding start end of the printing plate with the positioning pin. Since it can be performed extremely accurately and simply, the plate can be replaced in a short time, and the operating rate of the printing apparatus can be increased in accordance with the printing needs of a small lot.

Another intermittent rotary offset printing apparatus of the present invention fixes the winding start end of the printing plate to the plate cylinder body, winds the printing plate around the plate cylinder body, applies tension to the printing plate, and sets the winding end edge to the plate cylinder. In the intermittent rotary offset printing apparatus fixed to the main body, a printing plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and the printing plate is wound on one side of the printing plate fixing portion. First fixing means for fixing the start end is provided, and second fixing means for fixing the winding end of the printing plate is provided on the other side, and the winding start end of the printing plate is fixed to one side of the plate fixing portion. First fixing means is provided, and the first fixing means includes a smooth surface of the printing plate fixing portion, a plurality of positioning pins protruding from the smooth surface and separated in a direction of one generatrix of the plate cylinder body, and the printing plate A plurality of positioning notches formed at the winding start end of the plurality of positioning pins A claw for pinching the winding start end of the printing plate to be engaged and positioned from the outside, and a clamping means for moving the claw in a direction to be in close contact with the smooth surface to make it fixed. The winding start end is clamped and fixed between the claw and the smooth surface.
According to the above configuration, a plurality of positioning notches are formed at the winding start end of the printing plate without bending, and the positioning notches are engaged with the positioning pins to perform positioning. Since the winding start edge is clamped and fixed between the nail and the smooth surface, the positioning of the printing plate can be made extremely accurately and easily, so the printing plate can be replaced in a short time, and printing needs for small lots The operating rate of the printing apparatus can be increased in accordance with the above.

Another intermittent rotary offset printing apparatus of the present invention fixes the winding start end of the printing plate to the plate cylinder body, winds the printing plate around the plate cylinder body, applies tension to the printing plate, and sets the winding end edge to the plate cylinder. In the intermittent rotary offset printing apparatus fixed to the main body, a printing plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and the printing plate is wound on one side of the printing plate fixing portion. First fixing means for fixing the start end is provided, and second fixing means for fixing the winding end of the printing plate is provided on the other side, and the winding start end of the printing plate is fixed to one side of the plate fixing portion. First fixing means is provided, and the first fixing means includes a smooth surface of the plate fixing portion, and a stepped convex portion formed slightly higher by the smooth surface at a position near the peripheral surface of the plate cylinder body of the smooth surface. And a plurality of positionings protruding from the smooth surface and separated in a direction of one generatrix of the plate cylinder body And a claw for pinching the winding start end of the printing plate from the outside for positioning the plurality of positioning notches formed at the winding start end of the printing plate by engaging the plurality of positioning pins, and the claw And a clamping means for moving the adhesive plate in a direction in close contact with the smooth surface to form a fixed state. The step plate is bent and formed at the winding start end of the printing plate by the step protrusion and the claw. The winding start end is clamped and fixed between the claw and the smooth surface.
According to the above configuration, a plurality of positioning notches are formed at the winding start end of the printing plate without bending, and the positioning notches are engaged with the positioning pins to perform positioning. Since the winding start edge is clamped and fixed between the nail and the smooth surface, the positioning of the printing plate can be made extremely accurately and easily, so the printing plate can be replaced in a short time, and printing needs for small lots The operating rate of the printing apparatus can be increased in accordance with the above. In addition, since the stepped portion and the claw are formed by bending the stepped portion at the winding start end of the printing plate and the winding start end of the printing plate is clamped between the claw and the smooth surface and fixed, Since the start edge can be fixed firmly and without difficulty, when the end of winding of the printing plate is fixed to the plate cylinder body, the printing plate is pulled on the winding end edge side to wind the plate around the plate cylinder body. Even if sufficient tension is given to the printing plate, the winding start end of the printing plate is not fixed.

The plate cylinder for an intermittent rotary offset printing apparatus according to the present invention fixes the winding start end of the printing plate to the plate cylinder main body, winds the printing plate around the plate cylinder main body, applies tension to the printing plate, and prints the end of winding. In a plate cylinder for an intermittent rotary offset printing apparatus to be fixed to a cylinder body, a plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and on one side of the plate fixing section. First fixing means for fixing the winding start end of the printing plate is provided, and second fixing means for fixing the winding end end of the printing plate is provided on the other side, and the winding start of the printing plate is provided on one side of the printing plate fixing portion. First fixing means for fixing the end is provided, and the first fixing means is formed slightly higher by the smooth surface at a position close to the smooth surface of the plate fixing portion and the peripheral surface of the plate cylinder body of the smooth surface. A plurality of steps protruding from the smooth surface and separated in the direction of one generatrix of the plate cylinder body A positioning pin, and a claw for pinching the winding start end of the printing plate from outside to position by engaging a plurality of positioning notches formed at the winding start end of the printing plate with the plurality of positioning pins, A clamping means for moving the nail in a direction to be in close contact with the smooth surface and fixing the nail, and forming the step portion by bending the step protrusion and the nail at the winding start end of the printing plate. The winding start end of the plate is configured to be clamped and fixed between the claw and the smooth surface.
According to the above configuration, a plurality of positioning notches are formed at the winding start end of the printing plate without bending, and the positioning notches are engaged with the positioning pins to perform positioning. Since the winding start edge is clamped and fixed between the nail and the smooth surface, the positioning of the printing plate can be made extremely accurately and easily, so the printing plate can be replaced in a short time, and printing needs for small lots The operating rate of the printing apparatus can be increased in accordance with the above. In addition, since the stepped portion and the claw are formed by bending the stepped portion at the winding start end of the printing plate and the winding start end of the printing plate is clamped between the claw and the smooth surface and fixed, Since the start edge can be fixed firmly and without difficulty, when the end of winding of the printing plate is fixed to the plate cylinder body, the printing plate is pulled on the winding end edge side to wind the plate around the plate cylinder body. Even if sufficient tension is applied to the printing plate, the winding start end of the printing plate is not fixed.

According to the present invention, a plurality of positioning notches are formed at the winding start end of the printing plate without bending, and the positioning notches are engaged with the positioning pins for positioning and fixing.
In addition, the step is bent and formed at the winding start end of the printing plate, and the winding start end of the printing plate is clamped and fixed between the nail and the smooth surface, so that the positioning of the printing plate can be performed extremely accurately and easily. Therefore, the plate can be replaced in a short time, the plate can be replaced in a short time according to the printing needs of the small lot, and the printing device can be changed according to the printing needs of the small lot. The operating rate can be increased.

Hereinafter, an intermittent rotary offset printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall front view of the intermittent rotary offset printing apparatus according to the first embodiment.
The intermittent rotary offset printing apparatus shown in FIG. 1 includes a paper feeding unit 21, a plurality of sets having different ink colors, six sets of printing units 22, 23, 24, 25, 26, 27 in the figure, a die-cut roll unit 29, A pair of grip rolls 29 and 30 that provide intermittent reciprocating travel to the web across the printing units 22 to 27 and the die cut roll unit 28, a UV irradiation drying unit (not shown) installed on the downstream side of each printing unit, and a winding A take-up section 31 is provided, and the web W is sequentially passed therethrough so that multicolor printing can be performed by superimposing colors.

FIG. 2 is a schematic enlarged view of the printing unit 23 in FIG. The printing units 23 to 24 have the same configuration as the printing unit 22.
The printing unit 22 includes a plate cylinder formed by fixing a winding start edge and a winding end edge of a printing plate 36 wound around a circumferential surface of a non-circular plate cylinder main body 35, and an image line portion with respect to the printing plate 36. A soaking device 37 for soaking water in other parts, an inking device 38 for contacting and rotating the printing plate 36 to supply ink to the image line portion, and a blanket cylinder 39 for rolling and rotating in contact with the printing plate 36 And a pressure cylinder 40 that rotates by applying printing pressure to the circumferential portion of the blanket cylinder 39, and the ink supplied to the image line portion of the printing plate 36 is transferred to the blanket cylinder 39, and the blanket cylinder 39 It is configured to transfer and print on the web W to be printed that passes between the impression cylinders 40.

The inking device 38 kneads the ink supplied to the ink fountain 38a appropriately in the process of sequentially transferring to the ink roller group 38b, and then transfers and supplies the ink to the printing plate 36 as an ink film through the ink form roller 38c.
The printing plate 36 is formed, for example, by coating a negative photosensitive agent mainly composed of a diazo emulsion on an aluminum plate, and is printed with an image so that the non-image area (aluminum surface) is hydrophilic. The resist surface is oleophilic.
The printing plate 36 transfers the UV ink transferred to the image line portion to the outer peripheral surface of the blanket cylinder 39, and the blanket cylinder 39 travels with the transferred UV ink sandwiched between the impression cylinder 40. Transfer to the web W and print.

The printing units 22 to 27 constitute a six-color intermittent rotary offset printing apparatus. The plate cylinder and the blanket cylinder 39 are non-circular (one side of the circumference is recessed), and the impression cylinder 40 is a perfect circle. is there.
When the printing plate 36, the blanket cylinder 39, and the impression cylinder 40 are rotated and rotated in the forward rotation direction at a constant angle smaller than one rotation, the grip rolls 29 and 30 rotate in synchronization to rotate the web W. When the flat part of the blanket cylinder 39 comes to the impression cylinder 40 side and moves away from the impression cylinder 40, it rotates backward at a constant angle smaller than the above rotation and feeds the web W forward. It is designed to return only a short stroke. The intermittent rotary offset printing apparatus performs printing with a small repeat length by repeating this.

FIG. 3 is a schematic enlarged sectional view of the plate cylinder.
In the plate cylinder of this embodiment, a printing plate fixing portion 35a that is recessed as required from the plate cylinder main body circle S is formed on one side of the plate cylinder main body 35, and first fixing means is formed on one side of the printing plate fixing portion 35a. 50, and the second fixing means 60 is provided on the other side of the printing plate fixing portion 35a. The winding start end 36a of the printing plate 36 is fixed by the first fixing means 50, and the printing plate body 35 is fixed to the printing plate body 35. The winding end 36b is fixed by applying tension to the printing plate 36 by the second fixing means 60.

  The first fixing means 50 includes a smooth surface 51 formed on the plate fixing portion 35a and a step formed by the smooth surface 51 at a position close to the circumferential surface of the plate cylinder main body 35 with a slight height. A plurality of positioning pins 53 projecting to a position close to the step protrusion 52 of the smooth surface 51 and spaced apart from the plate cylinder body 35 in the direction of one generatrix, and the step protrusion more than the positioning pin 53 A plurality of stud bolts 54 projecting from the smooth surface 51 at a position away from the portion 52 and separated in the direction of one generatrix of the plate cylinder body 35, and the positioning pins 53 and the stud bolts 54 are fitted to the upper and lower sides. And a claw 55 that is clamped from the outside guided by the screw, and a clamping nut 56, a washer 57, and a spring washer 58 that move the claw 55 in a direction to come into close contact with the smooth surface 51 to make it fixed. Has been

The first fixing means 50 loosens the tightening nut 56 and lifts the claw 55 to make a gap between the claw 55 and the smooth surface 51, and insert the winding start end of the printing plate 36 into the gap. By simply engaging a plurality of positioning notches 36c formed at the winding start end of the printing plate 36 with the positioning pin 53, the winding start end of the printing plate 36 can be precisely positioned. The plate 36 is held so that the notch 36c does not move away from the positioning pin 53, and the tightening nut 56 is tightened.
Then, the stepped portion 52c and the claw 55 are bent to form the stepped portion 36c at the winding start end of the printing plate 36, and the winding start end 36a of the plate 36 is clamped between the claw 55 and the smooth surface 51 and fixed. Can do. By forming the stepped portion 36c, the winding start end of the printing plate 36 is sandwiched between the claw 55 and the smooth surface 51 by the nail 55 and the smooth surface 51 even if an external force is exerted to pull it outward. The pressure fixing works effectively, the winding start end of the printing plate 36 is not fixed, and precise positioning is ensured.

The second fixing means 60 includes a rotatable shaft body 61 having a deep slit extending in the generatrix direction, and a fixing means 62 for fixing the rotation of the shaft body.
As the fixing means 62, a one-way clutch bearing is preferably used, but other appropriate configurations can be adopted. In the case of using a one-way clutch bearing as the fixing means 62, the outer ring is provided so as to be fastened and fixed, and the rotatable direction of the inner ring is adjusted to the winding direction.
The second fixing means 60 is inserted into the slit of the shaft body 61 with a winding end 36b that has been turned back at 45 ° of the printing plate 36, so that the printing plate 36 is in relation to the plate cylinder main body 35 as shown in FIG. The shaft body 61 is rotated in the winding direction from the slack and not in close contact state, and as shown in FIG. 4, the printing plate 36 is wound on the shaft body 61, and this printing plate 36 is placed on the plate cylinder body 35. The shaft body 61 is fixed so as not to rotate.

As described above, the printing plate 36 is wound around the plate cylinder body 35 by the first fixing means 50 and the second fixing means 60, and printing is performed as described above.
After the end of printing, the first fixing means 50 and the second fixing means 60 are loosened and replaced with a printing plate used for next printing.

The present invention is not limited to the above-described embodiment, and includes various design changes within the scope not departing from the gist.
The blanket cylinder 39 includes a case in which the blanket (rubber) is wound around the blanket cylinder body as the same configuration as the plate cylinder.
The means for fastening the claw 55 is not limited to the combination of the stud bolt 54 and the fastening nut 56. As a means for tightening the claw 55, a boost link mechanism or the like may be used. In the above embodiment, the reamer hole is opened in the plate cylinder main body 35 and the positioning pin 53 is forcibly inserted. However, the positioning pin 53 is provided integrally with the claw 55 and is slidably fitted into the reamer hole in the plate cylinder main body 35. May be.

1 shows an overall front view of an intermittent rotary offset printing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic enlarged view of a printing unit in FIG. 1. It is a general | schematic expanded sectional view of the plate cylinder in which the printing plate is slack. It is a general | schematic expanded sectional view of the plate cylinder in which the printing plate is tense. It is a partial expanded sectional view of the conventional plate cylinder.

Explanation of symbols

35 Plate Cylinder Body 36 Printing Plate 50 First Fixing Means 51 Smooth Surface 52 Stepped Protrusion 53 Positioning Pins 54, 56 Stud Bolt, Tightening Nut (Tightening Means)
55 Claw 60 Second fixing means

Claims (4)

In the intermittent rotary offset printing apparatus that fixes the winding start end of the printing plate to the plate cylinder body, winds the printing plate around the plate cylinder body, applies tension to the printing plate, and fixes the winding end edge to the plate cylinder body,
A plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and a first fixing means for fixing the winding start end of the printing plate is provided on one side of the plate fixing portion. And a second fixing means for fixing the winding end of the printing plate on the other side,
The first fixing means has a plurality of positioning pins that are separated from each other in the direction of one generatrix of the plate cylinder main body, and a plurality of positioning notches formed at the winding start end of the printing plate are engaged with the positioning pins. An intermittent rotary offset printing apparatus configured to fix a winding start end of the printing plate to be positioned. In the intermittent rotary offset printing apparatus that fixes the winding start end of the printing plate to the plate cylinder body, winds the printing plate around the plate cylinder body, applies tension to the printing plate, and fixes the winding end edge to the plate cylinder body,
A plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and a first fixing means for fixing the winding start end of the printing plate is provided on one side of the plate fixing portion. And a second fixing means for fixing the winding end of the printing plate on the other side,
The first fixing means is formed at a smooth surface of the plate fixing portion, a plurality of positioning pins protruding from the smooth surface and separated in a direction of a generatrix of the plate cylinder main body, and a winding start end of the printing plate. A plurality of positioning notches are engaged with the plurality of positioning pins for positioning, and a claw that clamps the winding start end of the printing plate from the outside, and the claw is moved and fixed in a direction in close contact with the smooth surface. An intermittent rotary offset printing apparatus comprising: a fastening means for bringing the printing plate into a state, and being configured to clamp and fix a winding start end of the printing plate between the claw and the smooth surface. In the intermittent rotary offset printing apparatus that fixes the winding start end of the printing plate to the plate cylinder body, winds the printing plate around the plate cylinder body, applies tension to the printing plate, and fixes the winding end edge to the plate cylinder body,
A plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and a first fixing means for fixing the winding start end of the printing plate is provided on one side of the plate fixing portion. And a second fixing means for fixing the winding end of the printing plate on the other side,
The first fixing means includes a smooth surface of the plate fixing portion, a stepped convex portion formed slightly higher by the smooth surface at a position near the peripheral surface of the plate cylinder body of the smooth surface, and protruding from the smooth surface. The printing plate for positioning by positioning a plurality of positioning pins spaced apart in the direction of one generatrix of the plate cylinder body and a plurality of positioning notches formed at the winding start end of the printing plate with the plurality of positioning pins A claw for pinching the winding start end from the outside, and a clamping means for moving the claw in a direction to be in close contact with the smooth surface so as to fix the claw. An intermittent rotary offset printing apparatus characterized in that a step portion is formed by bending at the winding start end of the plate and the winding start end of the printing plate is clamped and fixed between the claw and the smooth surface. A plate cylinder for an intermittent rotary offset printing apparatus in which the winding start end of the printing plate is fixed to the plate cylinder main body, the printing plate is wound around the plate cylinder main body, the tension is applied to the printing plate, and the winding end end is fixed to the plate cylinder main body. In
A plate fixing portion that is recessed as required from the plate cylinder main body circle is formed on one side of the plate cylinder main body, and a first fixing means for fixing the winding start end of the printing plate is provided on one side of the plate fixing portion. And a second fixing means for fixing the winding end of the printing plate on the other side,
The first fixing means includes a smooth surface of the plate fixing portion, a stepped convex portion formed slightly higher by the smooth surface at a position near the peripheral surface of the plate cylinder body of the smooth surface, and protruding from the smooth surface. The printing plate for positioning by positioning a plurality of positioning pins spaced apart in the direction of one generatrix of the plate cylinder body and a plurality of positioning notches formed at the winding start end of the printing plate with the plurality of positioning pins A claw for pinching the winding start end from the outside, and a clamping means for moving the claw in a direction in close contact with the smooth surface to fix the plate, and the plate with the stepped convex portion and the claw. For an intermittent rotary offset printing apparatus, wherein a step portion is formed by bending at the winding start end, and the winding start end of the printing plate is clamped and fixed between the claw and the smooth surface. Plate cylinder.

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