JPH08208112A - Printed sheet guiding method for folding machine for rotary press machine - Google Patents

Abstract

PURPOSE: To improve folding accuracy and at the same time prevent a sheet face stain by setting a curved part of the triangular board nose into such vibration state as making a coefficient expressed by a product of a frequency and an amplitude within a specified range and reducing a frictional resistance between a paper sheet and a triangular board nose. CONSTITUTION: A projection 5 is provided in a part in the reverse side of a triangular board nose 3 which is not contacted with a paper sheet and an ultrasonic vibrator 4 is mounted so that a curved part of the triangular board nose 3 is vibrated by using a coefficient (K), 20<=K<=120. Here, the coefficient (K) is an coefficient of expressing a vibration state and when the frequency is (f) and the vibration amplitude is (d), then it is expressed K=f.d. When it is vibrated at some frequency in this range, as the vibration amplitude is larger, more friction reduction effect can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing paper guide method for a folder for a rotary printing press.

[0002]

2. Description of the Related Art A triangular plate installed in a conventional folding machine for a rotary printing machine is, for example, as shown in FIGS. 8 and 9, a traveling paper (hereinafter referred to as a paper) is an upper surface of a main body 2 of the triangular plate 1 and a triangular plate nose 3 at its tip. And runs along the side and is folded in two in that direction. At this time, the plurality of air blow holes 2a and 3 are provided so that the paper does not come into strong contact with the side surfaces of the main body 2 and the triangular plate nose 3.
a is provided, the wear coefficient between the paper and the triangular plate 1 is reduced, the resistance generated when folding is reduced, and the reduction of this resistance prevents the paper surface from being soiled. In order to reduce the resistance and prevent the paper surface from becoming dirty, the upper surface and the side surface of the triangular plate 1 are plated with chrome, and the surface is finished to be smooth.

[0003]

In the above-mentioned prior art, 1) In the surface smooth finish of chrome plating (hydrophilic) having a repulsion property against air blow and ink adhesion,
The reduction in resistance and the effect of smearing the paper surface with printing ink are not sufficiently enhanced.

2) Air is accumulated inside the folded paper, the paper on the triangular plate swells, folding accuracy decreases, wrinkles and the like occur, and print quality deterioration or paper jams and other troubles are likely to occur. Further, in order to prevent this bulging, a means for escaping excess air between the triangular plate and the paper by means of a groove or the like is required. 3) An air source for air blow is required,
Since air is constantly blown, air pressure must be controlled (adjusted), and the amount of air consumed is large. To improve this, the triangular plate body 2 and triangular plate nose 3 have small vibrations of high amplitude. A method of applying vibration is proposed in Japanese Utility Model Laid-Open No. 4-44257.

The above-mentioned device is a triangular plate 1 as shown in FIG.
On the triangular plate nose 3 at the tip of the, a mechanical or electric vibrator that generates a vibration having a small amplitude higher than the frequency of paper, or a vibration generator 11 such as an ultrasonic vibrator is provided with an auxiliary bar 12 that transmits vibration. The vibration generator 11 such as a vibrator or an ultrasonic vibrator is directly fixed and connected to the triangular plate nose 3 as shown in FIG.

However, in this invention, the specific frequency, vibration amplitude and vibrating portion are not limited, and there is a problem that the function cannot be sufficiently exhibited. The present invention was developed to address such problems, and an object of the present invention is to clarify specific frequencies, vibration amplitudes, and vibration parts.

[0007]

In order to achieve the above object, the structure of the present invention is such that the curved portion of the triangular plate nose (having a large resistance due to a large surface pressure) is vibrated at a coefficient of 20 ≦ K ≦ 120. Further, a vibration generator including an ultrasonic oscillator and a piezoelectric body and a power source for driving them is additionally provided on the triangular plate nose. Here, the coefficient K is a coefficient representing the state of vibration, and is represented by K = f · d, where f is the vibration frequency and d is the vibration amplitude.

[0008]

[Action]

(1) By using the coefficient K and vibrating in the range of 20 ≦ K ≦ 120, the frictional resistance of the sliding portion is reduced. When vibrating at a certain frequency within this range, the larger the vibration amplitude is, the more the effect of reducing friction is obtained. Experimental values at a frequency of 20 kHz are shown in FIG. By setting the vibration amplitude to 2 μm ^0-9 or more, the frictional resistance of the sliding portion is reduced to 1/5 or less, the folding accuracy is improved, and the paper surface can be prevented from being soiled. The proper range of vibration frequency and vibration amplitude is as shown in FIG. In the figure, the line K = fd = 120 indicates that the limit from the strength of the piezoelectric body used for vibrating means that the vibration speed is 0.75 m /
It can be obtained from the relationship between the vibration amplitude and the frequency by setting s. Further, the range of frequency is as shown in the figure due to restrictions from the size of the ultrasonic vibrator (due to the mounting space of the triangular plate) and power conversion efficiency. Further there Effect In the figure, the ratio mu / mu _o frictional resistance when there as no effective not to vibrate as if obtained by vibration μ / μ _o =
0.2 is used as a guideline for the effect, and if the value is smaller than 0.2, the effect is obtained, and if the value is larger than 0.2, the effect is not produced.

(2) The ultrasonic transducer 4 is attached to the triangular plate nose 3
If you add it in consideration of its vibration characteristics, as shown in the example of Fig. 7,
The curved portion of the triangular plate nose 3 can be vibrated in the above state (1).

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which a triangular plate nose 3 is provided.
A protrusion 5 having a protruding shape is provided on the back side portion that does not come into contact with the paper, and an ultrasonic vibrator (for example, bolted Langevin type ultrasonic vibrator) 4 is attached with a bolt.
Vibrate at high frequency. The shape of the protrusion 5 can be manufactured by integrally working with the triangular plate nose 3 or by pressure welding to the triangular plate nose 3. Further, in the latter method, it is possible to manufacture it by simply additionally processing the ready-made triangular plate nose 3.

FIG. 2 shows a second embodiment of the present invention. In order to attach the ultrasonic transducer 4 to the triangular plate nose 3, the rear side portion of the triangular plate nose 3 that does not come into contact with the paper is counterbored and joined by bolts. The triangular plate nose 3 is vibrated at high frequency. Similar to the method of the first embodiment, the major feature of this embodiment is that it can be manufactured only by additional processing on the ready-made triangular plate nose 3, and there is no need for additional processing on the main body 2 of the ready-made triangular plate 1. It is in.

FIG. 3 shows a third embodiment of the present invention, in which an ultrasonic oscillator 4 is attached to a triangular plate nose 3 to vibrate at a high frequency. FIG. 4 shows a fourth embodiment of the present invention, in which the piezoelectric element 6 is directly attached to the triangular plate nose 3 and fixed by a bolt, and the triangular plate nose 3 is vibrated at a high frequency. In the figure, 7 indicates a meter.

When the curved portion of the triangular plate nose is vibrated in the range of 20≤K≤120 using the coefficient K, the paper and the triangular plate nose 3
The effect of reducing the resistance due to friction between and is as shown in FIG. The horizontal axis of FIG. 5 represents the vibration amplitude at a point on the triangular plate nose 3 that is in contact with the paper, and the vertical axis represents the friction coefficient ratio. Here, the friction coefficient ratio is obtained by dividing the frictional force when high frequency vibration is performed by the frictional force when high frequency vibration is not performed. This figure shows that as the vibration amplitude increases, the friction coefficient ratio, that is, the resistance due to the friction between the paper and the triangular plate nose 3 decreases.

[0014]

As described above, according to the present invention, K = f · d, 20 ≦ K ≦ 12 is applied to the triangular plate constituting the folding machine of the rotary printing press.
Since the printing paper is guided while giving vibration of 0 (however, K: coefficient, f: frequency, d: vibration amplitude), as shown in FIG. 5, the resistance due to friction between the paper and the triangular plate nose A reduction effect is obtained, and this reduction in resistance improves folding accuracy,
In addition, stains on the paper surface can be prevented. The effect of reducing the frictional resistance is indicated by the friction coefficient ratio μ / μ _o <0.2.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a triangular plate nose according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a triangular plate nose according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a triangular plate nose according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a triangular plate nose according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a frictional resistance reduction effect of the present invention.

FIG. 6 is an explanatory diagram of a proper vibration range of the present invention.

FIG. 7 is a vibration characteristic diagram of the triangular plate nose of the present invention.

FIG. 8 is an explanatory diagram of a conventional triangular plate.

FIG. 9 is a front view showing a cylinder arrangement of a folding machine of a rotary printing press.

FIG. 10 is a side view of a conventional triangular plate.

FIG. 11 is a side view of another conventional triangular plate.

[Explanation of symbols]

 3 Triangular plate nose 4 Ultrasonic transducer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Matsushima 5007 Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd.Mihara Works (72) Inventor Katsuhiko Morimoto 5007 Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries Mihara (72) Inventor Mitsunori Nakajima 1-20-24 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Ryomei Giken Co., Ltd.

Claims (2)

[Claims] 1. A printing paper guiding method for a folding machine for a rotary printing press, which comprises applying a vibration satisfying the following formula to a triangular plate constituting a folding machine of the rotary printing press while guiding the printing paper. K = f · d 20 ≦ K ≦ 120 where K: coefficient f: frequency (KHz) d: vibration amplitude (μm) 2. A printing paper guide method for a folding machine for a rotary printing press according to claim 1, wherein f = 10 to 60 KHz d = 2 to 12 μm.