JPS58120265A - Drum driving mechanism for recorder - Google Patents

Abstract

PURPOSE:To realize a high-stiffness transmitting mechanism to drive a drum with high precision, by providing a drum driving means near the center part in the longitudinal direction of the drum to reduce the disturbance of a picture due to the torsional deformation of the drum and the oscillation of the drum. CONSTITUTION:An electrostatically recordable recording medium film is wound around the surface of a drum 11, and an inside gear 12 constituting the driving means is attached to the inside circumference in the center part in the longitudinal direction of the drum 11, and a motor 13 which drives the drum 11 is attached to a subplate 14 and is fixed into the drum 11. When the drum driving means is attached to the approximate center part of the drum 11 in this manner, the disturbance of the picture due to the torsional deformation of the drum and the oscillation of the drum is reduced, and thus, a high-stiffness transmitting mechanism is realized, and the drum is driven with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum drive mechanism for a recording apparatus, and more particularly to a drum drive mechanism for a recording apparatus suitable for high-speed variable speed recording such as a facsimile.

An example of a conventional recording device will be explained with reference to FIG.

In an electrostatic image transfer system that performs recording, printing, transfer, and cleaning, a recording medium film wound around the outer periphery of a drum 1 rotates together with the drum 1. Record and develop around drum 1.

The following components are provided in the order of transfer and cleaning. Namely, there is a multi-needle electrode 2 that records image information on a recording medium film as an electrostatic latent, a current device 3 that transfers toner to a recording medium film by the action of static electricity, and a device 3 that transfers toner on a recording medium to paper. A charger 4 for transferring, and a static eliminator 5 for weakening the electrostatic bonding force between the toner and the recording medium.
and a cleaning device 6 for removing residual toner.

Next, the external force that becomes a problem when driving the drum 1 at a high speed variable speed will be explained with reference to FIG.

As described above, a cleaning device 6 with two multi-needle electrodes is attached around the rotatable drum 1 so as to press the drum 1 over its entire length. Therefore, a frictional force F,, F, acts on the drum 1, resulting in a torsion moment, and a drag force N,, N, as a result of which a bending moment acts.

FIG. 2 shows the configuration of a drum drive mechanism of a conventional recording apparatus.The drive mechanism for the drum 1 consists of a gear 7 attached to the right or left end of the drum L, a gear 8 meshing with the gear 7, and a gear 8 that meshes with the gear 7. 8, and a lip 10 is attached to the side of the drum 1 opposite to the drive mechanism. For this reason, the behavior of the surface of the drum 1 on the driving force input side and the left end differs greatly due to the torsional moment and torsional imaging, resulting in a disadvantage that the image quality is disturbed as shown in FIG. 3.

The drum 1 is driven by an external gear 7, and it is difficult to reduce its weight due to the weight of the seat to which the external gear 7 is attached and the gear itself.
The material used for the drum is aluminum, which requires, for example, a lip 10 and bearings to rotatably support the drum, which also makes it difficult to reduce the weight, and as a result, the inertia is large and one line/line The drawback was that it was difficult to drive at a high speed of about m8.

Furthermore, since the motor 9 that drives the drum 1 is attached to the outside of the drum 1, the driving force transmission path becomes long, the rigidity of the transmission mechanism becomes weak, and high-precision driving is difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mechanism for driving a drum of a recording device at high speed and with high precision at variable speed.

A feature of the present invention is that a recording medium consisting of a dielectric layer and a conductive layer is attached to the outer peripheral surface of the drum, and is recorded on the outer periphery of a rotatably mounted drum in order in the rotational direction of the drum. A device that records electrostatic latent scratches on a medium, an ink generator that transfers toner to the electrostatic latent scratches, a charger that transfers toner on the recording medium to paper, and removes residual toner. In the electrostatic recording apparatus, the drum driving means is provided near the center of the entire length of the drum.

An embodiment of the present invention will be described below with reference to FIG. Fourth
In the figure, 11 is a drum, and a recording medium film capable of electrostatic recording is wound around the surface of this drum 11. An internal gear 12 constituting a driving means is attached to the inner periphery of the center of the entire length of the drum 11, and a motor 13 for driving the drum 11 is attached to a sub-plate 14.
It is fixed inside the drum. A gear mechanism 15 is interposed between the internal gear 12 and the motor 13.

When the drum driving means is mounted approximately at the center of the drum 11 in this manner, distortion of the image quality due to torsional deformation of the drum and its imaging is reduced. Furthermore, the driving force transmission path becomes shorter, a highly rigid transmission mechanism can be realized, and highly accurate drum driving becomes possible.

In addition, an example is shown in which the drum 11 is made of graphite-containing polyimide, which is lightweight and has lubricating properties. It is directly attached to a thin-walled iron cylinder 16 having a diameter.

When the drum 11 is made of such a material, the weight of the drum 11 can be reduced, and, for example, the lip and the outer ring or inner ring of the bearing can be removed, making it possible to reduce the inertia of the rotating body. Furthermore, it is also possible to reduce the vibration of the drum 11 due to the variable speed due to the sliding friction between the drum 11 and the cylinder that supports it.

FIG. 5 shows an embodiment in which a rolling bearing 17 is mounted on the outer periphery of the drum 11, making it possible to reduce frictional resistance.

According to the present invention, since the mechanism for transmitting the driving force can be made highly rigid, the drum can be driven at a high speed with variable speed and with high accuracy, so that good image compensation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional view of the front view of the entire recording apparatus, FIG. 2 is a perspective view showing a partial cross section of the drum drive mechanism, and FIG. 3 is a diagram illustrating image disturbance caused by the conventional drum drive mechanism. , FIG. 4 is a partially sectional perspective view of one embodiment of a drum driving beak of a recording device of the present invention, and FIG. 5 is a partially sectional perspective view of another embodiment of the present invention. be. 11...Drum, 11...Internal gear, 13...Motor, 15...Gear mechanism. χ 3 口￥i4tD

Claims (1)

[Claims] 1. A recording medium including a dielectric layer and a conductive layer has an outer circumference 4
On the outer periphery of the drum, which is affixed to the surface and rotatably attached, there is a device that records an electrostatic latent phenomenon on a recording medium at 11 points in the direction of rotation of the drum, and a device that transfers toner to the electrostatic latent bond. In the electrostatic dispensing device, which is equipped with a printer, a charger for transferring the toner on the recording medium onto the paper, and a cleaning device for removing residual toner, the drive means for the drum is set at the center of the entire length of the drum. A drum drive mechanism for electric wiring manufacturing, which is characterized by being installed near the section. 2. A patent characterized in that the drum driving means is comprised of an internal gear attached to the inner periphery near the center of the overall length of the drum, a one-wheel mechanism that meshes with the internal gear, and a drive mechanism that drives the gear mechanism. A drum drive mechanism of a recording device according to claim 1. 3. A drum drive mechanism for a recording device according to claim 2, wherein the motor for driving the drum is fixed to a side plate of the main body of the recording device and housed within the drum. . 4. A drum drive mechanism for a recording apparatus according to claim 1, wherein the drum is made of a lightweight and lubricating material.