JPH01215541A - Apparatus for mounting blanket of printing cylinder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blanket mounting device for wrapping a blanket around a printing cylinder such as a blanket cylinder of an offset printing machine.

[Conventional technology]

The printing cylinders of various printing machines, such as the rubber cylinder of offset printing machines, are wrapped with blankets formed by alternately overlapping rubber layers and cloth. The image is transferred to a blanket on the blanket cylinder and then transferred to paper for printing.

Blanket mounting devices for wrapping such blankets have conventionally been equipped with a pair of winding bars that are suspended parallel to the trunk axis in the notch C of the trunk circumference, and the shaft end of this winding bar has a , a ratchet device or a worm gear device for rotationally operating the device is provided. One end of the blanket is inserted into a groove extending in the direction of the ridgeline of one winding bar, and the blanket is wound around the circumferential surface of the trunk by the rotating operation of the trunk, and the other end is inserted into the groove of the other winding bar. By rotating the bar, it is attached in close contact with the circumference of the torso. During this installation, an underlayment made of brown paper, plastic sheet, or the like is inserted between the trunk circumference and the blanket, and is wrapped around the trunk at the same time as the blanket.

[Problem to be solved by the invention]

However, when attaching a blanket using such a conventional device, it is necessary to press the blanket and underlay against the circumferential surface of the torso with one hand while rotating the torso by pressing a push button with the other hand, which makes it difficult to place the blanket in the correct position. It requires skill to attach the printer to the printer, and operation can become unstable and cause printing problems.

In addition, there are problems in that the rolled part of the long blanket hits the face and surrounding areas, making it difficult to operate and damaging the surface of the blanket.The blanket also has poor slippage, which causes problems between the rubber cylinder and the impression cylinder. There was a risk of getting your hand caught between them.

[Means for Solving the Problems] - In order to solve the above problems, the present invention provides a semi-circular arc cross section that stores the free end side of the blanket in a rolled state, with one end fixed in the trunk circumference notch. A receiving gutter and a deflection shaft for deflecting the blanket coming out of the receiving gutter toward the fixing member in the notch around the trunk were provided.

[For production]

One end of the blanket is fixed in the notch around the body, and the part other than the fixed end is rolled up with the back side inside and stored in the receiving machine, and then the blanket that comes out of this receiving gutter is changed direction by the changing direction axis. guide it to the fixing member inside the notch around the trunk and fix it. When the torso is rotated in this state, the blanket adheres tightly to the inner surface of the receiving gutter due to its elasticity, and resistance is provided by the deflection axis, so it can be kept under tension without sagging or bouncing even if you do not press it by hand. Wrapped around the torso. Thereafter, when the other end of the blanket is fixed to the other winding bar and the winding bar is rotated, the blanket is attached tightly to the circumferential surface of the torso in a taut state.

〔Example〕

1 and 2 show an embodiment of the apparatus for attaching a blanket to a printing cylinder according to the present invention, FIG. 1 is a side view of the vicinity of the blanket cylinder in which this is implemented, and FIG. 2 is a developed plan view. In Figure 0, between the left and right frames 1.2, there is a plate cylinder 3 with a printing plate attached to its circumferential surface, and a blanket cylinder 4 having the same diameter as the plate cylinder 3.
The rubber cylinders 4 are mounted on a shaft with their circumferential surfaces facing each other, and the outer circumference of the blanket cylinder 4 is provided with a notch 4a having a predetermined angle. In the notch 4a, a winding bar 5 on the gripping side and a winding bar 6 on the butt side are rotatably supported by the left and right bearers 4b, and these winding bars 5.6 has a groove 5a extending over its entire length.

6a are provided respectively. A pair of fixing plates 7 formed in a rectangular shape are fixed close to each of the winding bars 5 and 6 on the outer periphery of the end surface of the operating side bearer 4b, and a bracket is fixed perpendicularly to each fixing plate 7. 8 and the fixed plate 7, a worm shaft 9 is rotatably supported. Reference numeral 10 denotes a worm fixed to the war 11 shaft 9, which meshes with the worm wheel 11 fixed to the winding bars 5 and 6.
By fitting the square holes and rotating the worm 1
0 and the worm wheel 11, the winding bar 5.6
is configured to rotate. Reference numeral 14 denotes a temporary spring formed in a U shape and fixed to the bracket, which engages with the hexagonal head 12 and restricts the worm shaft 9 from rotating unless an external force is applied. A T-shaped stopper 15 is inserted into the hole of the zero-turn bar 5 and is urged toward the insertion side by a compression coil spring 16.
The base 18a at the tip of the blanket 17 inserted into the hole 5a
It is configured to engage with the groove 5a to prevent it from coming off from the groove 5a.

On the other hand, at the rear of the rubber cylinder 4, brackets 19 formed in an N-shape are fixed to the frame 1.2, and a pair of bolts 20 screwed into these brackets 19 have semicircular arc cross sections. The gourd holes 21a of the pair of receiving gutter 21 formed in the shape of a gutter are engaged with each other, and after engagement, the receiving gutter 21 is fixed to the bracket 19 by dropping the receiving gutter 21 downward and tightening the bolt 20. It is configured to In this receiving gutter 21, the portion of the blanket 17 other than the gripping end is stored in a rolled state with the surface facing inside. The blanket 17 that came out from the receiving gutter 21 is rewound and one end is inserted into the groove 5a of the winding bar 5.
A deflection shaft 23 is provided near the blanket cylinder 4 to deflect the blanket 17 in the direction of the winding bar 5 in the cylinder circumferential notch 4a.

That is, the holder 2 is placed on the inner surface of the left and right frames 1.2.
4 is bolted to the holder 24, and a deflection shaft 23 is rotatably supported on this holder 24 by fitting both end shaft portions into U-shaped grooves. 23, the direction is changed, tension is applied, and the winding bar 5 is guided.

25 is a blanket 1 made of chakengi or plastic sheet.
7, the underlay is formed to have the same width and length as the blanket 17, and is superimposed on the blanket 17 and passes through the guide shaft 23 to the blanket cylinder 4.
It is inserted between the circumferential surface of the blanket cylinder 4 and the blanket 17 and wound around the circumferential surface of the blanket cylinder. 26 is fixed to the wall surface of the notch 4a and the underlayment 2
Leaf spring 27 for guiding the winding start end of 5 and the blanket 17
It is a gripping fitting that fixes the

Explaining the mounting operation by the blanket mounting device configured as described above. When the zero-roll bar 5 is in the position shown in the figure, one end of the underlayment 25 is held in the grip fitting 26 and fixed to the wall surface of the notch 4a. When the nozzle 18a of the blanket 17 is inserted into the groove 5a of the gripper side winding bar 5 which is open in the circumferential direction, the blanket 17 is inserted into the nozzle 1.
8a is fixed to the blanket cylinder 4 by being prevented from being removed by the stopper 15. Therefore, when the worm shaft 9 is rotated with the box spanner 13, the winding bar 5 rotates clockwise in the figure due to the engagement between the worm lO and the worm wheel 11, and assumes the position shown in the figure. overlap and guide backward through the direction change axis 23,
Then, when the blanket 17 is rolled up with the front side facing inside and both ends of the rolled blanket 17 are stored in the receiving gutter 21, the blanket 17 expands due to its elasticity and the back surface is pressed against the inner circumferential surface of the receiving gutter 21. Then, when the blanket cylinder 4 is rotated by pressing a button, etc., the blanket 1 is rotated.
7 and the underlay 25 are overlapped and wrapped around the trunk surface.

In this case, as described above, the back surface of the blanket 17 presses against the inner circumferential surface of the receiving gutter 21, generating frictional force, so tension is applied to the blanket 17 wrapped around the trunk circumferential surface, which is different from the conventional method. Even if the blanket 17 is not pressed by hand, it is wrapped around the torso f1 in a tensioned state without sagging, and since the butt end of the blanket 17 is in the receiving gutter 21, it may flap around and cause damage to the face and surrounding areas. There is no chance of hitting a member, etc., and there is no need to touch the blanket cylinder, so there is no risk of your hand getting caught between the blanket cylinder 4 and the impression cylinder, and there is no need to press the blanket 17 by hand. By this, the deflection axis 2 close to the winding bar 5
3 can be installed, the blanket 17 is correctly guided to the winding bar 5, and further tension is applied to the blanket 17 so that it does not slacken.

When the winding bar 6 on the butt side reaches the position of the winding bar 5 on the mouth side shown in the figure, the rotation of the rubber cylinder 4 is stopped, and the other end side cap 18b of the plancher 17 wound around the trunk circumference is After inserting the groove 6a of the winding bar 6 which is open in the circumferential direction,
When the worm shaft 9 is rotated with the box spanner 13,
The winding bar 6 occupies the illustrated position, the blanket 17 and the underlay 25 are brought into pressure contact with the circumferential surface of the trunk, and the winding operation of the blanket 17 is completed.

Although this embodiment shows an example in which the present invention is applied to a blanket cylinder of an offset printing machine, it can be applied to any cylinder to which a blanket is attached, and the same effects can be obtained.

(Effects of the Invention) As is clear from the above description, in the present invention, in the blanket mounting device on the printing cylinder, a cross-sectional half-section is provided in which the free end of the blanket, one end of which is fixed in the notch around the cylinder, is stored in a rolled state. By providing an arc-shaped receiving gutter and a deflection shaft that deflects the blanket coming out of the receiving gutter toward the fixed member in the notch around the body, when wrapping the blanket around the circumferential surface of the body, The free end of the blanket stored in the receiving gutter is elastically pressed against the inner circumferential surface of the receiving gutter, generating an 811 force, and resistance is applied to the blanket by the deflection axis, so the plankent is Even if you are not holding it down with your hands, it will not sag and will be wrapped under tension.
Printing problems do not occur, improving the quality of printed matter and reducing the amount of waste paper, and the free end of the blanket does not hit the face or surrounding members, eliminating injuries caused by the blanket. In addition, since there is no need to hold down the blanket with one hand, there is no need to get your hand caught between the torso, greatly improving safety and operability. Since the adjacent deflection shafts can be installed, the blanket can be correctly guided to its fixing member, and the blanket can be attached stably.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the apparatus for attaching a blanket to a printing cylinder according to the present invention, FIG. 1 is a side view of the vicinity of the blanket cylinder in which this is implemented, and FIG. 2 is a developed plan view. . 4...Rubber cylinder, 4a...Notch, 5゜6...
・Wrap bar, 17...Blanket, 19...
Bracket, 21...Gutter, 23...Direction change shaft, 25...Underlayment.

Claims (1)

[Claims] In a blanket mounting device in which a blanket with one end fixed in a notch around the trunk is wrapped around the trunk circumferential surface by rotation of the trunk and the other end is fixed, the blanket is installed near the trunk parallel to the trunk axis and the one end is fixed. A receiving gutter with a semicircular arc cross section stores the free end side of the fixed blanket in a rolled state, and a receiving gutter is axially suspended between the receiving gutter and the trunk, and the blanket coming out from the receiving gutter is placed in the notch around the trunk. A device for mounting a blanket onto a printing cylinder, characterized in that it is provided with a deflection shaft that deflects in the direction of the blanket fixing member.