JPH03269561A - Magnetic printing device - Google Patents

Abstract

PURPOSE:To obtain a stable printed matter by using a pressure transfer roll of a pressurizing method with a back up roll for a transfer roll. CONSTITUTION:A magnetic latent image is formed by a recording head 1 accessed to a surface of a magnetic drum 2, and a toner image is formed by developing at a developing device 3 for visualizing the magnetic latent image. Then, pressurized transfer is carried out by press fixing the toner image on the paper 4 carried in with rotation of the magnetic drum 2. The pressurizing at this time is carried out with the pressure transfer roll 6, and a the back up roll 5 is provided in the back side of this pressure transfer roll 6 so that pressure is evenly imparted to the magnetic drum 2. Then, the toner image transferred on the paper 4 is heat fixed by a heat roll 8 and the printed matter is completed. Thus, the stable printed matter can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic printing device that receives signals from a computer or the like and displays characters, figures, etc. on paper.

[Prior Art] A conventional magnetic printing device has a recording section, a developing section, a transfer section, a cleaner section, and a demagnetizing section sequentially arranged around a magnetic drum, as disclosed in Japanese Patent Application Laid-Open No. 54-32328. A magnetic latent image was formed, visualized with a developing material (toner, etc.) using a developing device, and then transferred to the paper surface using static electricity.

In addition, other proposals are
As disclosed in No. 7, transfer and fixing were performed simultaneously by applying pressure.

[Problems to be Solved by the Invention] However, the prior art disclosed in Japanese Patent Laid-Open No. 54-32328 uses both magnetic energy and electrostatic energy as a printing system, so it suffers from the temperature and humidity stability peculiar to magnetic recording. This effect is lost, and the environment is almost the same as that of electrostatic laser beam printers, and the characteristics of the magnetic method are not effectively utilized. In addition, compared to the above-mentioned ones, the one published by Tokuko Sho 56-2347 is made entirely of magnetic energy, but due to the large pressure applied during fixing, the paper gets crushed and the paper surface becomes glossy, making it undesirable as a printed matter. I had an issue.

The present invention is intended to solve these problems, and its purpose is to use a pressure method to transfer the toner image visualized on the drum after development onto the paper surface.
The purpose of the present invention is to provide a magnetic printing device that can always produce stable printed matter.

[Means for Solving the Problems] A magnetic printing device of the present invention includes a magnetic head, a developing device, a transfer device, a cleaner, and a demagnetizer arranged sequentially in the rotational direction of a magnetic drum. The device is characterized in that it is a pressure transfer device using a pressure method.

The transfer device of the magnetic printing device of the present invention is a pressure transfer device, and the material of the pressure roller used is an elastic material with a rubber hardness of 80 or less.

[Embodiment 1] FIG. 1 is a main sectional view of the magnetic printing apparatus of the present invention. 1
is a recording head, 2 is a magnetic drum, 3 is a developer, 4 is paper,
5 is a backup roller, 6 is a pressure transfer roller, 7 is a fixed roller, 8 is a heat roller, 9 is a cleaner, and 10 is a demagnetizer. In order to print with this magnetic printing apparatus, first a magnetic latent image is formed on the surface of the magnetic drum 2 by the recording head 1 accessed by a predetermined signal. Next, in order to visualize the magnetic latent image, it is developed by a developing device 3 to form a toner image. Further, as the magnetic drum rotates, the toner image is pressed onto the paper 4 carried in, and pressure transfer is performed. Pressure at this time is performed by a pressure transfer roller 6, which is made of fluororubber and has a rubber hardness of 45 in order to perform higher transfer.

Furthermore, a backup roller 5 is provided on the back side of the pressure transfer roller 6 so as to apply pressure uniformly to the magnetic drum 2. As a result, the toner image transferred to the paper 4 is thermally fixed by the heat roll 8 to complete a printed matter. On the other hand, the magnetic drum 2 continues to rotate, the residual toner is removed by a cleaner 9, the magnetic latent image is erased by a demagnetizer 10, and a new printing process begins. This printing process takes one cycle, but if you want to make multiple copies, you can do high-speed multicopies by releasing the demagnetizer after cleaning and repeating development, transfer, and fixing without erasing the magnetic latent image.

In order to evaluate the characteristics of the magnetic printing device obtained using this method, we examined the printed matter under different environments.

The environmental conditions were a temperature of 40° C. and a humidity of 60%. Under these environmental conditions, 500 prints were continuously produced, and the stability of print quality from the initial print to the 500th print was confirmed. As a result, there was no change in print quality from the initial print to the 500th print, and the print quality was stable.

[Example-2] A plow magnetic printing device was manufactured based on the same configuration as Example-1. The material of the transfer roller used at this time was silicone rubber to which carbon was added, and the rubber hardness was 60 and the surface resistance was 10 3 ·Cm or less.

This magnetic printing device using a pressure transfer roller can eliminate the natural charge of paper and toner through the transfer roller during transfer, so it is possible to suppress scattering due to the influence of static electricity to a higher level and produce printed matter with high print quality. It was done.

[Effects of the Invention] As described above, the present invention uses pressure for transfer in a magnetic printing device, thereby making it possible to always obtain stable printed matter without worrying about variations in the electric charge of toner or paper. It is possible to provide a printing device.

Another effect is that in the past, it was necessary to select the resin material and adjust the specific resistance in order to impart static electricity to the toner, but with this method, there is no need to take these considerations into consideration, which increases the flexibility in toner design. It also has the effect of spreading.

Although the hardness of the transfer roller is described in the examples, it is not limited to this and can be selected at any time since it is determined by the physical properties of the toner and the pressing force.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a main sectional view of a magnetic printing device showing one embodiment of the present invention. 1...Recording head 2...Magnetic drum 3...Developer 4...Paper 5...Buffer roll 6...Pressure transfer roller 7 ... Fixed roller 8 ... Heat roller 9 ... Cleaner 10 ... Demagnetizer or higher

Claims (2)

[Claims] (1) A magnetic printing device in which a magnetic head, a developing device, a transfer device, a cleaner, and a demagnetizer are arranged sequentially in the rotational direction of a magnetic drum, characterized in that the transfer device is a pressure transfer device using a pressure method. magnetic printing device. (2) The magnetic printing apparatus according to claim 1, wherein the pressure roller used in the pressure transfer device is made of an elastic material and has a rubber hardness of 80 or less.