JP2967914B2 - Printing paper guide method for folding machine for 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 printing paper guide method for a folder for a rotary printing press.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, for example, a triangular plate installed in a conventional rotary printing press folding machine is composed of a main body 2 of a triangular plate 1 and an upper surface of a triangular plate nose 3 at the end thereof. And runs along the side, and is folded in two in that direction. At this time, a plurality of air blow holes 2a and 3 are provided so that the paper does not strongly contact the side surfaces of the main body 2 and the triangular plate nose 3.
a is provided to reduce the coefficient of wear between the paper and the triangular plate 1, reduce the resistance generated when folding, and prevent the paper from being soiled by the reduction in the resistance. In order to reduce the resistance and prevent the paper surface from being stained, the upper and side surfaces of the triangular plate 1 are chrome-plated, and the surface is smoothed.

[0003]

In the prior art described above, 1) In the case of (hydrophilic) chromium plating having a repelling property against air blow and ink adhesion, a smooth surface finish is required.
The resistance reduction and the effect of printing ink on the paper surface are not sufficient.

2) Air accumulates inside the folded paper, and the paper on the triangular plate swells, and the folding accuracy is reduced, wrinkles and the like are generated, and it is easy to cause problems such as print quality deterioration or paper jam. In order to prevent this bulging, a means for releasing excess air between the triangular plate and the paper by a groove or the like is required. 3) An air source for air blowing is required.
Since air is blown constantly, air pressure must be controlled (adjusted), and there is a problem that the air consumption is large. For this improvement, the triangular plate main body 2 and the triangular plate nose 3 have a small frequency of a high frequency. A method for providing vibration is proposed in Japanese Utility Model Laid-Open No. 4-44257.

[0005] The above-mentioned idea is based on the triangular plate 1 shown in FIG.
An auxiliary bar 12 that transmits a vibration to a triangular plate nose 3 at the tip of a vibration generator 11 such as a mechanical or electric vibrator or an ultrasonic vibrator that generates a vibration having a small amplitude of a frequency higher than the frequency of the paper. The vibration generator 11 such as a vibrator or an ultrasonic vibrator is fixedly connected to the triangular plate nose 3 as shown in FIG.

However, in the present invention, the specific frequency, vibration amplitude, and vibration site are not limited, and there is a problem that the function cannot be sufficiently exhibited. The present invention has been developed to address such problems, and has as its object to clarify specific frequencies, vibration amplitudes, and vibration locations.

[0007]

In order to achieve the above-mentioned object, according to the present invention, a curved portion of a nose of a triangular plate (a large resistance due to a large surface pressure) is vibrated at 20 ≦ K ≦ 120 using a coefficient K. Then, a vibration generator including an ultrasonic vibrator, a piezoelectric body and the like and a power supply 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) The frictional resistance of the sliding portion is reduced by vibrating between 20 ≦ K ≦ 120 using the coefficient K. In this range, when the vibration is performed at a certain frequency, the effect of reducing the friction is obtained as the vibration amplitude increases. The 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 stain on the paper surface can be prevented. FIG. 6 shows an appropriate range of the vibration frequency and the vibration amplitude. In the figure, the line of K = fd = 120 indicates that the limit from the strength of the piezoelectric body used for vibration is 0.75 m / vibration speed.
s is obtained from the relationship between the vibration amplitude and the frequency. Further, the range of the frequency is as shown in the figure due to the restriction on the size of the ultrasonic transducer (due to the restriction of the mounting space of the triangular plate) and the restriction on the power conversion efficiency. Furthermore there Effect In the figure, the ratio mu / mu _o frictional resistance when there that no effect is not vibrated as if obtained by vibration μ / μ _o =
0.2 is a measure of the effect. If the value is smaller than 0.2, the effect is effective, and if it is larger than 0.2, the effect is not effective.

(2) The ultrasonic vibrator 4 is connected to the triangular plate nose 3
In addition, considering the vibration characteristics,
The curved portion of the triangular plate nose 3 can be vibrated in the state (1).

[0010]

DETAILED 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.
A projection 5 having a protruding shape is provided on the back side that does not come into contact with the paper, and an ultrasonic vibrator (for example, a Langevin type ultrasonic vibrator with bolts) 4 is attached with bolts, and the triangular plate nose 3
Is vibrated at high frequency. The shape of the protrusion 5 can be manufactured by integrally processing with the triangular plate nose 3 or by crimp welding to the triangular plate nose 3. Further, in the latter method, it is possible to manufacture the triangular plate nose 3 simply by additionally processing it.

FIG. 2 shows a second embodiment of the present invention. In order to attach the ultrasonic vibrator 4 to the triangular plate nose 3, the back side of the triangular plate nose 3 which is not in contact with the paper is counterbored and connected by bolts. The triangular plate nose 3 is vibrated at a high frequency. The major feature of this embodiment is that, similarly to the method of the first embodiment, it is possible to manufacture it by simply adding it to a pre-made triangular plate nose 3, and it is not necessary to additionally process the main body 2 of the pre-made triangular plate 1. It is in.

FIG. 3 shows a third embodiment of the present invention, in which an ultrasonic vibrator 4 is mounted on 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 adhered to the triangular plate nose 3 and fixed by bolts, and the triangular plate nose 3 is vibrated at high frequency. In the figure, reference numeral 7 denotes a meter.

When the curved portion of the triangular plate nose is vibrated at 20 ≦ K ≦ 120 using the coefficient K, paper and triangular plate nose 3
FIG. 5 shows the effect of reducing the resistance due to the friction between. The horizontal axis in FIG. 5 indicates the vibration amplitude at one point on the surface of the triangular plate nose 3 which comes into contact with the paper, and the vertical axis indicates 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
Since the printing paper is guided while applying a vibration of 0 (where 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 is reduced. The effect of reduction is obtained, the folding accuracy is improved by this resistance reduction,
In addition, dirt on the paper surface can be prevented. The effect of the reduction in frictional resistance is a standard of friction coefficient ratio μ / μ _o <0.2.

[Brief description of the 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 reducing effect of the present invention.

FIG. 6 is an explanatory diagram of an appropriate vibration range according to 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 folder of the 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 Triangle plate nose 4 Ultrasonic transducer

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Satoshi Matsushima 5007 Itozakicho, Mihara City, Hiroshima Prefecture Inside Mitsubishi Heavy Industries, Ltd.Mihara Works Co., Ltd. (72) Katsuhiko Morimoto 5007 Itozakicho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries Shares (72) Inventor Mitsunori Nakajima 1-20-24 Kanon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Ryomei Giken Co., Ltd. (56) References JP-A-5-246004 (JP, A) −44257 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65H 45/00-45/30 B41F 13/00-13/70

Claims (2)

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