JPH0344528Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impression cylinder front register and oblique image fine adjustment device in an offset printing press.

Conventionally, in an offset printing machine in which the printing paper is conveyed directly to the impression cylinder by a riser roller, after the printing paper is kicked into the impression cylinder by the riser roller, fine parallel adjustment and diagonal fine adjustment in the vertical direction of the image of the printing machine are performed. There is no known adjustment device.

Furthermore, as a device for adjusting the position of the plate and adjusting the oblique image of an image, there is known a device disclosed in Japanese Patent Publication No. 12528/1973.

This device moves the removable tightening lever, which is held by the plate in its mouth, along the pin by the operation of a drive worm while holding the plate in its mouth to perform fine adjustment of the oblique image, and then closes the removable tightening lever. is further moved in the circumferential direction of the plate cylinder using gears or eccentric pins to tension the bottom of the plate.

However, this device cannot perform parallel fine adjustment in the vertical direction of the image, and the image transferred to the rubber cylinder must be erased before fine adjustment of the image, making the fine adjustment work of the image complicated. It was hot.

In addition, after making fine adjustments to the oblique image of the plate, it is necessary to further tighten the grip of the plate, which not only makes the operation difficult and makes it impossible to make fine adjustments to the image in a short period of time and accurately, but also has an extremely complicated structure. There was a problem with becoming.

The present invention has been developed in view of the above-mentioned problems, and it is possible to perform vertical parallel fine adjustment and oblique fine adjustment of an image with simple operations, in a short period of time, and with an extremely simple structure. It is an object of the present invention to provide a simplified front register and oblique image fine adjustment device for an impression cylinder.

However, this adjustment method has the disadvantage that it takes a lot of effort and time, such as having to tighten the butt of the plate after spinning it for a considerable amount of time before the plate adjusts to the plate cylinder. .

Therefore, as a result of studies in view of the above-mentioned conventional deficiencies, the present invention has been developed to provide a front register and an impression cylinder that has an extremely simple structure and is capable of easily and accurately performing vertical parallel fine movement and oblique image adjustment. A diagonal image fine adjustment device is obtained.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.As shown in FIGS. 1 to 5, an impression cylinder 1
In the opening 2 of the impression cylinder 1, a shaft 5 is rotatably installed by press-fitting a metal 4 into the shaft bearings 3, 3 provided on the operation side A and the non-operation side B of the impression cylinder 1, and the shaft 5 can be operated. Side A
A rotating arm 6 is fixed to the.

Further, the shaft 5 is provided with a bearing 7 for preventing deflection, and a claw mount 8 is fixed to the shaft 5. A claw 9 is fixed onto the claw mount 8 with a screw 10, and is rotatably attached to the shaft 5. be. Further, an adjustment screw 12 is screwed into the claw pressure adjustment bracket 11 fixed to the shaft 5, and the tip of the adjustment screw 12 comes into contact with the claw mounting base 8, so that the gripping force of the printing paper 13 can be adjusted. ing.

The above-mentioned gripping force is achieved by a spring 1 installed between a pressure adjustment screw 14 screwed onto the claw mount 8 and a spring guide pin 15 press-fitted into the claw pressure adjustment bracket 11.
It is set to be performed at 6.

Further, on the paper holding side C of the opening 2 of the impression cylinder 1, spring guide pins 17, 17 and eccentric slide pins 18, 18' are provided on the operation side A and the non-operation side B.
Disc spring 19, flat washer 20, nut 21,
Base plate 2 assembled via spring pin 22
4 and 24 are fixed with countersunk screws 25.

Eccentric slide pins 18 and 1 are provided on the operating side A and non-operating side B of the base plates 24 and 24, respectively.
8' so that the movement can be adjusted in the lateral direction (in the axial direction of the impression cylinder), and the eccentric slide pin 1
By arbitrarily rotating 8 and 18', the operating side
Alternatively, they are movable in the direction opposite to the operation side.

On the paper-holding side C, the impression cylinder front part 28, which has a stopper 28a attached to its body, can be moved slightly by the spring guide pin 17 to the paper-holding side C and the paper-holding end side D on the slide plate. Contact portions 26a of 26, 27,
It is assembled in contact with 27a.

Both ends of the impression cylinder front 28 are in constant contact with the contact portions 26a, 27a of the slide plates 26, 27 by incorporating a spring 23, a flat washer 38, a spring washer 39, and a nut 40 into the spring guide pins 17, 17. It has been incorporated.

Both ends of the impression cylinder front stop 28 are always pressed against the contact portions 26a, 27a of the slide plates 26, 27 by incorporating a spring 23, a flat washer 38, a spring washer 39, and a nut 40 into the spring guide pins 17, 17. I have let you.

The impression cylinder front plate 28 has a notch at the location where the pawl 9 is located, and a pawl rest piece 29 fixed to the paper gripping side C of the impression cylinder 1 is incorporated in the notch. A notch 30 is provided for the nail of the person to be transferred to the next process to fit into it.

Further, a stopper 31 is fixed to the shaft 5 by a tightening screw 32 as shown in FIG.
The pressure of the claw 9 is prevented from being applied more than necessary, and a spring receiver 33 whose end is formed to receive a spring is fixed with a screw 34. A spring 37 is interposed between the spring receiving bracket 36 and the spring receiving bracket 36 fixed thereto.

Here, the eccentric slide pin 18 is connected to the slide plates 26, 27 by fixing the eccentric roller 18a.
The roller holes 26b and 27b are rotatably fitted into the roller holes 26b and 27b.

Further, both ends of the impression cylinder front stop 28 are formed into sloped surfaces 28c so that the contact portions 26 of the slide plates 26 and 27
It is convenient to make pressure contact with a and 27a, since the slight movement can be performed smoothly.

In the above configuration, fine adjustment of the front register and oblique image is performed as follows.

Now, if the eccentric direction of the eccentric slide pins 18, 18' is placed at the upper side, that is, at the middle position, then the impression cylinder front abutment 2
8 is set to be located midway between the impression cylinder holding side C and the paper holding end D direction.

To explain the actual printing state in detail in this state, first, the first color is printed. Next, the printing paper on which the first color has been printed is loaded on the paper feed tray, the plate is replaced with the second color, and several sheets are printed. At this time, if both the lateral and front registers are good, printing will continue as is, but the higher the quality of printing (requiring printing accuracy), the more it will be necessary to register from the second color.

Next, we will discuss parallel microtremors.

Assuming that the entire printing paper 13 is misaligned in parallel to the direction in which it is desired to move forward, the adjustment at this time is to rotate the eccentric slide pin 18 counterclockwise and the other eccentric slide pin 18' clockwise by the same amount. If the slide plates 26 and 27 slide inward, the impression cylinder front plate 28
moves slightly toward the end D side of the impression cylinder.

Next, a case will be described in which the image is adjusted diagonally.

If you want to adjust the operating side A of the printing paper 13 to advance and the counter-operating side B to retard, turn the eccentric slide pin 18 on the - side counterclockwise, and turn the eccentric slide pin 18 on the other side.
When 8' is rotated counterclockwise, the impression cylinder front stop 28 becomes oblique. Therefore, oblique images of printed images are possible.

As explained above, according to the impression cylinder front register and oblique image fine adjustment device in an offset printing press according to the present invention, by arbitrarily rotating the eccentric slide pins 18, 18' in the left and right directions, the slide plate 2
6 and 27, the impression cylinder front register 28 can be moved slightly in the direction of the paper gripping side A and the paper gripping bottom side B of the impression cylinder as well as diagonally, so that the printing paper is conveyed to the impression cylinder by the riser roller. Later, fine parallel adjustment and diagonal image adjustment in the vertical direction of the printing paper can be easily and accurately carried out in a short time by simple operations. Furthermore, the structure is extremely simple and maintenance management is easy.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view showing the impression cylinder front register and oblique image fine adjustment device in an offset printing press according to the present invention, and Figs. 2, 3, 4, and 5 are the same as Fig. 1. - line, - line, - line,
- is a cross-sectional view taken along each arrow. 1... impression cylinder, 2... opening, 13... printing paper,
17... Spring guide pin, 18, 18'... Eccentric slide pin, 23... Spring, 26, 27
...Slide plate, 26a, 27a...Contact part, A
...Operation side, B...Non-operation side, C...Paper holding side,
D...The butt side holding the paper in its mouth.

Claims (1)

[Scope of utility model registration request] A spring guide pin having a spring 23 on the paper gripping side C of the opening 2 of the impression cylinder 1 is used in an impression cylinder front registration and oblique image fine adjustment device in an offset printing machine in which printing paper is conveyed directly to the impression cylinder by a riser roller. 17, an impression cylinder front stopper 28 having a stopper 28a movably provided on the paper holding side C and the paper holding end side D, contact portions 26a and 27a that contact both ends of the impression cylinder front stop 28, and a slide hole. Slide plates 26 and 27 having 26b and 27b and the slide plate 2
6, 27 in the axial direction of the plate cylinder, and eccentric slide pins 18, 18' rotatably fitted in the slide holes 26b, 27b so as to be adjustable in the axial direction of the plate cylinder. Front register and oblique image fine adjustment device.