JP3073282B2 - Plate mounting structure of rotary printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate mounting structure for winding a printing plate around a plate cylinder in a web rotary press.

[0002]

2. Description of the Related Art After being wound around a plate cylinder, a plate of a web-fed rotary printing press has both ends formed by an inner wall of an axially long groove formed on an outer peripheral surface of the plate cylinder and a winding rod provided in the long groove. Is pinched. Then, the winding rod is rotated to be drawn into the long groove, and is attached to the plate cylinder in a tensioned state. The plate mounted on the plate cylinder is required to have a uniform tension in each direction, and to be firmly held so that it does not loosen during printing and register errors do not occur. .

An example of a conventional plate mounting structure will be described with reference to FIGS. In these figures, reference numeral 1 denotes a plate cylinder, which is integrally formed by a cylinder main body 2, a disk-shaped bearer 3 at both ends thereof, and an end shaft 4. One long groove 5 is provided on the outer peripheral surface of the body 2 in the axial direction. The cross section of the long groove 5 has a semi-circular surface 5a and an inclined surface 5c extending from both ends of the semi-circular surface 5a to a narrow opening 5b on the outer peripheral surface of the trunk body 2.
5d. The end face of the opening 5b is chamfered, and the bearer 3 is formed with a shaft hole 6 concentric with the semicircular surface 5a.

A winding rod 7 is rotatably supported in the long groove 5 and the shaft hole 6. The winding rod 7 has a large diameter portion 7 corresponding to the long groove 5.
a and a small diameter portion 7b fitted into the shaft hole 6. The large-diameter portion 7a is formed with a kerf 9 for holding one end (hereinafter, referred to as a rear end) 8b of the plate 8, and is provided on the front side in the tightening rotation direction of the kerf 9 (indicated by an arrow A in the figure). Is formed with a flat surface 7c that sandwiches the other end (hereinafter referred to as the front end) 8a of the plate 8 with the inclined surface 5c.

In mounting the plate 8, as shown in FIG. 9, the rear end 8b is inserted into the cut groove 9, and the front end 8a is sandwiched between the inclined surface 5c of the long groove 5 and the plane 7a of the winding rod 7.
The winding rod 7 is rotated in the direction of arrow A. Then, as shown in FIG. 10, the rear end 8b is pulled in by the winding rod 7, and the plate 8 comes into close contact with the outer peripheral surface of the plate cylinder 1. A plurality of spring holes 10 are formed in parallel on the front side of the plane 7c of the large diameter portion 7a,
In these spring holes 10, a ball 11 and this ball 11
And a compression coil spring 12 for compressing the compression coil spring to the semi-circular surface 5a.

As shown in FIGS. 11 and 12, a small-diameter portion 7b protruding from the bearer 3 is provided at the tip with a hexagonal portion 1 for tooling.
3, while a ratchet 15 is attached via a key 14 to the small diameter portion 7b. In addition, the small diameter portion 7
A claw lever 16 is fitted to the b so as to sandwich the ratchet 15. A leaf spring 17 is provided at the left end of the claw lever 16 in FIG.
A pawl 18 is provided which is urged to engage with the teeth of the ratchet 15, and the ratchet 15, that is, the rotation of the winding rod 7 is rotated by an arrow A.
Only allowed in the direction. Further, a tightening screw 19 is provided at the right end in FIG. 11 of the claw lever 16, and the tip of the screw 19 abuts on the end shaft 4 of the plate cylinder 1. By tightening the additional screw 19, the claw lever 16, that is, the winding rod 7 can be further tightened.

Hereinafter, the operation of this device will be described. First,
As shown in FIG. 9, the tip 8a of the plate 8 is
After insertion between c and the plane 7c of the winding rod 7, the plate 8 is wrapped around the barrel main body 2 and the rear end 8b is inserted into the cut groove 9 of the winding rod 7. Next, the plate 8 is wound around the plate cylinder 1 in a tensioned state by applying a wrench or the like to the hexagonal portion 13 and rotating the winding rod 7 in the direction of arrow A and retracting the rear end 8b as shown in FIG. At this time, the engagement of the ratchet 15 and the claw 18 prevents the winding bar 7 from rotating in the reverse direction, while the pressing reaction force of the ball 11 increases the gripping force of the plate by the winding bar 7.
Next, by tightening the tightening screw 19, the pawl lever 16 is rotated.
, The winding rod 7 is rotated to bring the plate 8 into a completely tensioned state. Note that the above-described winding device is also formed on the opposite side of the plate cylinder 1 so that the plate 8 can be wound without twisting.

[0008]

The conventional plate mounting structure described above has the following disadvantages. When the plate 8 is mounted, the rear end 8b must be inserted into the cut groove 9 of the winding rod 7 through the opening 5b, but this operation requires carefulness and takes time, resulting in a decrease in work efficiency. When the plate 8 is separated, the winding rod 7 is rotated in the reverse direction to take out the rear end 8b from the kerf 9, but as shown in FIG. 10, the rear end 8b undergoes large plastic deformation at the time of mounting. Therefore, even if the winding rod 7 is returned to the state shown in FIG.
Remains bent at steep angles. As a result, the rear end 8b
Acts like a leaf spring in the incision 9 and does not come out easily,
Pulling out by hand also resulted in a decrease in work efficiency. Since the angle at which the winding rod 7 is rotated when the plate 8 is mounted and when the plate 8 is separated is relatively large, it is difficult to secure a work space for the work, and much work time is required. That is, as shown in FIG.
The inking roller 21 and the like are in contact with each other, and the work of mounting the plate 8 must be performed between the blanket cylinder 20 and the inking roller 21. Therefore, the hexagon part 13 cannot be rotated by a wrench or the like at one time, and a plurality of operations are required. In order to give the plate 8 complete tension, it is necessary to tighten the tightening screw 19 after rotating the winding rod 7, which complicates the operation. When the plate 8 is inserted into the long groove 5, a safety bar 22 (shown in FIG. 14) provided between the plate cylinder 1 and the blanket cylinder 20 is used.
The machine stops when touches. Therefore, the length of the tip 8a of the plate 8 is limited, and the insertion must be performed carefully.

The present invention has been made in view of the above situation,
An object of the present invention is to provide a plate mounting structure for a rotary printing press, which can easily and quickly mount a plate on a plate cylinder while adopting a relatively simple configuration.

[0010]

In order to solve this problem, the present invention solves this problem by providing a long groove formed in the cylindrical surface of the plate cylinder and extending along the axial direction of the plate cylinder, and provided in the long groove. A cylindrical winding rod that rotates around a central axis along the axial direction of the plate cylinder; a cutting groove formed on the cylindrical surface of the winding rod and extending along the axial direction of the winding rod; Pin in the groove
An elastic body which is detachably held through the pin and presses the leading end of the plate between one end thereof and the inner wall of the long groove and locks the rear end of the plate at the other end with the rotation of the winding rod. And a plate holding member having a substantially V-shape made of a metal plate.

[0011]

According to the plate mounting structure of the present invention, the front end and the rear end of the plate can be held by the plate holding member by reciprocating the winding rod by a small amount in the rotating direction. The plate can be opened with one touch.

[0012]

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the embodiments, the same members as those of the above-described conventional members are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a cross-sectional view of a main part of a plate cylinder in an embodiment of a plate mounting structure of a rotary printing press according to the present invention, FIG. 2 is a perspective view of a part of a winding rod, and FIG. The plate cylinder is shown in a front view, and FIG. 4 shows the end of the plate cylinder in a side view. 5 to 8 show a procedure for mounting the plate on the plate cylinder.

In FIG. 1 and FIG. 2, reference numeral 23 denotes a retainer which is a plate holding member in this embodiment, and is accommodated in a relatively large tapered cross-section 9 formed in the winding rod 7 and has two pins 24. It is fixed by. Retainer 23 is approximately V
It is a spring steel plate formed in a U-shape, and a plurality of spring steel plates are attached to the winding rod 7 at a predetermined interval in a compressed state as shown in FIG. End in FIG. 1 the left side of the retainer 23 (hereinafter, referred to as tip) 23a by its spring force, pressed between the distal end 8a of the plate 8 between the inclined surface 5c of the elongated groove 5.
On the other hand, an end portion in FIG. 1 the right side of the retainer 23 (hereinafter, referred to as the rear end) 23b is bent in an L-shape, the rear end 8b and the engaging also bent in L-shape of the plate 8 It is supposed to.

On the other hand, as shown in FIGS. 3 and 4, a hexagonal portion 13 is formed at the end of the winding rod 7 similarly to the above-described conventional device, and the winding rod 7 is rotationally driven by a tool such as a spanner. I can do it. A lever 25 is fitted to the base of the hexagonal portion 13, and a spring guide 27 for guiding a compression coil spring 26 is rotatably attached to an end of the lever 25. In the figure, 28 is a stopper. The hexagonal portion 13, that is, the winding rod 7, is urged counterclockwise by the spring force of the compression coil spring 26, and is balanced with the spring force of the retainer 23 in the state shown in FIG.

Hereinafter, a procedure for mounting a plate in this embodiment will be described. In this embodiment, the winding rod 7 is first rotated clockwise by a predetermined angle as shown in FIG. 6 from the state before the plate mounting shown in FIG. This rotation is performed by applying a wrench or the like to the hexagonal portion 13, but the angle is smaller than that of the conventional one.
It is easy to secure a working space. Thereafter, the operator inserts the leading end 8a of the plate 8 into the long groove 5, and opens the winding rod 7. Then, the winding rod 7 returns to the original position by the spring force of the compression coil spring 26, and the tip 23a of the retainer 23 and the long groove 5
The front end 8a of the plate 8 is pressed between the inclined surface 5c and the front end 8a.

Next, as shown in FIG.
Is rotated clockwise by a predetermined angle. Then, retainer 2
The rear end 23b retracts rightward and abuts against the inclined surface 5d while the front end 23a of the third 3 presses the front end 8a of the plate 8. Thereafter, the operator inserts the rear end 8b of the plate 8 into the long groove 5 and opens the winding rod 7. Then, the winding rod 7 returns to the original position again by the spring force of the compression coil spring 26, and the rear end 8b of the plate 8 is engaged with and held by the rear end 23b of the retainer 23 as shown in FIG.

On the other hand, when the plate 8 is separated, the operator
Is rotated clockwise by a predetermined angle. Then, each member is in the state shown in FIG. 6, and both the front end 8a and the rear end 8b of the plate 8 are opened. At this time, there is no need to pull out the tip 8a of the plate 8 by hand as in the conventional apparatus, and the operation is completed with one touch.

As described above, in this embodiment, the plate 8 is mounted only by reciprocating the winding rod 7 twice in the rotational direction, and furthermore, the separation can be performed with one touch, so that the work time of each operation can be greatly reduced. It became possible. In addition, since the work of inserting the front end 8a and the rear end 8b of the plate 8 into the long groove 5 does not require any delicate adjustment, the mounting work has been performed reliably and easily. Further, the tip 8a of the plate 8 is connected to the tip 23a of the retainer 23.
However, it is only necessary to have a length that can be held down.

Although the description of the concrete embodiment has been completed above, embodiments of the present invention are not limited to this embodiment. For example,
In the above embodiment, the retainer 23 is of a split type, but may be of an integral type. Further, the winding rod 7 may be driven by an electric actuator or the like to further reduce labor.

[0021]

According to the plate mounting structure for a rotary printing press according to the present invention, a substantially V-shaped plate holding member made of an elastic material is used.
At one end, the front end of the plate is pressed between the inner wall of the long groove, and at the other end, the rear end of the plate is locked, so that the plate can be easily attached to the plate cylinder while adopting a simple configuration. In addition, effects such as being able to be performed quickly are exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a plate cylinder in an embodiment of a plate mounting structure of a rotary printing press according to the present invention.

FIG. 2 is a perspective view showing a part of a winding rod.

FIG. 3 is a front view showing a plate cylinder.

FIG. 4 is a side view showing an end of the plate cylinder.

FIG. 5 is an explanatory diagram showing a procedure for mounting a plate on a plate cylinder.

FIG. 6 is an explanatory diagram showing a procedure for mounting a plate on a plate cylinder.

FIG. 7 is an explanatory diagram showing a procedure for mounting a plate on a plate cylinder.

FIG. 8 is an explanatory diagram showing a procedure for mounting a plate on a plate cylinder.

FIG. 9 is a sectional view of a main part showing a conventional plate cylinder.

FIG. 10 is a sectional view of a main part showing a conventional plate cylinder.

FIG. 11 is a front view showing a conventional plate cylinder.

FIG. 12 is a side view showing an end of a conventional plate cylinder.

FIG. 13 is an explanatory diagram showing a roller arrangement of the rotary printing press.

FIG. 14 is an explanatory diagram showing a relationship between a safety bar and a plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate cylinder 2 body 5 long groove 5 c inclined surface 7 rod 8 plate 8 a tip 8 b rear end 9 cut groove 13 hexagonal part 23 retainer 23 a tip 23 b rear end 24 pin 25 lever 26 compression coil spring

Continuation of the front page (56) References JP-A-2-103148 (JP, A) JP-A-48-20607 (JP, A) JP-A-2-71655 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B41F 27/12

Claims (1)

(57) [Claims] 1. A long groove formed in a cylindrical surface of a plate cylinder and extending along an axial direction of the plate cylinder, and provided in the long groove, and rotated around a central axis along the axial direction of the plate cylinder. A cylindrical winding rod, a kerf formed on the cylindrical surface of the wrapping rod and extending along the axial direction of the wrapping rod, and detachably held in the kerf through a pin , Along with the rotation, a substantially V-shaped plate holding member made of an elastic body that clamps the leading end of the plate between one end thereof and the inner wall of the long groove, and locks the rear end of the plate at the other end. A plate mounting structure for a rotary printing press, comprising: