JPH0418579A - Magnet roller working method - Google Patents

Abstract

PURPOSE:To suppress the accuracy of the deflection of an outer peripheral surface of a magnet roller pipe within 5mum against the axis lines of the shafts between a left and right flanges by holding the flange of the magnet roller with a collet at the spindle side having a chuck width of <=1mm. CONSTITUTION:The shaft D of the left and right flanges 3 at a work 1 is chucked with the collet at the spindle side of the N/C lathe, the right flange 4 being received with a rotating center 8, and the work 21 is rotated. Next by using a cutting tool 9, the shaft B of the left flange 3, the outer peripheral surface of the pipe 2, and the shaft C of the right flange 4 are simultaneously machined by one chucking. In this case, the shape of the chuck of the collet 7 is formed to be <=1mm of the contacting width when the shaft D is chucked. Thus the deviation of the outer peripheral surface of the pipe 2 against the axis lines of the shafts B and C at the left and right flanges 3, 4 is satisfied with 5mum of the required accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic roller built into an ion printer of office automation equipment.

[Prior Art] Conventionally, the configuration of an ion printer (see FIG. 3) is to emit ions 32 generated from an ion cartridge 31 toward a drum 33 based on a print symbol, and to generate charges corresponding to the print signal on the drum 33. 0 to form an electrostatic latent image
Next, the drum 33 is rotated, the negative component magnetic toner 34 is conveyed by the magnetic roller 35, the electrostatic latent image on the drum 33 is visualized by the toner 34, and the fed paper 34 is
Transfer and fixing are performed simultaneously by applying pressure with a pressure roller 37 from the back side of the drum 33, and the I-ner 34 remaining on the drum 33 is removed with a cleaning blade 38.
Furthermore, the drum 33 is moved by the eraser 39 for the next image formation.
Erase the residual charge on the top. This ion printer does not require an optical system, unlike conventional laser printers, LED printers, LCD printers, etc., and therefore has a simple structure.

One major factor that determines the ion printer MIF having the above configuration is the gap size P between the drum 33 and the magnet roller 35 when the electrostatic latent image on the drum 33 is visualized.

If the change (fluctuation) in this gap dimension P is large, problems such as distortion of characters and symbols and shading of printed characters occur. Therefore, high precision is required in machining the drum 33 and the magnetic roller 35.

The structure of the magnet roller 35 (see FIG. 4) is composed of a stainless steel pipe 40, a left flange 41, and a right flange 42. The material of the pipe 40 is 5US304
Or 316 is formed with a diameter of 20cm and a wall thickness of 0.5cm,
A magnet 43 is built inside it. The magnet 43 is rotatably held by a bearing 44. A left flange 41 and a right flange 42 are press-fitted or bonded to both ends of the pipe 40. Bearings are installed on the B and C axes of the left and right flanges 41 and 42,
The magnet roller 35 itself is configured to be rotatable.

As mentioned above, B of the left and right flanges 41 and 42.

High precision is required for the deflection of the outer circumferential surface of the pipe 40 with respect to the axis of the C-axis, and the required precision is 5 μm (see Fig. 4). Created by making full use of

However, with the current processing technology, the coaxiality A between the inner diameter of the pipe 40 to which the left and right flanges 41 and 42 are fitted and the outer peripheral surface of the vibrator 40 can be guaranteed with the 5μ wire (see Figure 5).
, and the fitting shaft of the pipe 40 and the left and right flanges 41.4.
The coaxiality with the B and C axes of Pipe 40 can be guaranteed to be 5 μ- with current processing technology (see FIG. 6, only the right flange 42 is shown).Furthermore, left and right flanges 41.
Left and right flanges 4 when press-fitting or gluing 42
1.42 against the pipe 40 is guaranteed to be 20μ-.The guaranteed accuracy is the accumulation of accuracy of 0 or more, but this guaranteed accuracy value is 30μ (see Figure 7),
This value is far different from the above-mentioned required accuracy of 5 μι.

In order to solve the above drawback, the flange at one end of the manufactured magnetic roller 35 (hereinafter referred to as the work) was chucked to a collet chunk on the spindle side of the lathe (hereinafter referred to as the collet), and the flange at the other end was pressed by the rotation center. It is held rotatably and the left and right flanges 41 and 42 are cut using processing tools.
A magnetic roller machining method has been used in which the B and C axes and the outer peripheral surface of the pipe 40 are machined with one chuck (the workpiece is not attached or detached during these processes).

[Problem to be solved by the invention]

However, the prior art has the following drawbacks.

In other words, when chucking the workpiece 35 to the collet 45, if the chucked portion (Q) is large, the workpiece 3 before machining
The misalignment of the workpiece 35 will be directly reflected in the chuck state (see Fig. 8).If force is applied in this state to correct the workpiece 35 and it is held by the collet 45 and rotation center 46, the workpiece 35 will absorb the stress internally. The workpiece 35 is machined with the accumulated stress, and when the chuck is released after the process is completed, the internal stress of the workpiece 35 is released, which causes the workpiece 35 to become deformed.

Therefore, the present invention has been developed in view of the drawbacks in the prior art, and is a processing method that can suppress the deflection of the outer circumferential surface of the pipe 40 with respect to the axes of the B and C axes of the left and right flanges 41 and 42 to within 5 μm. For the purpose of providing law.

[Means and operations for solving the problems] In order to solve the above-mentioned drawbacks, the present invention has a magnetic roller in a developing device that visualizes an electrostatic latent image on a drum, and a flange at one end of the magnetic roller is connected to a lathe or a grinder. In the magnetic roller machining method, the shaft of the flanges on both sides and the outer circumferential surface of the pipe are machined in one chuck using a machining tool, which is chucked to a collet on the main shaft side and held rotatably by pressing the flange at the other end at a rotation center. In this method, the collet on the spindle side of the lathe or grinder holds the flange of the magnetic roller with a chuck distance of 1- or less.

Additionally, in order to prevent the workpiece from deforming due to the force of pushing from both the chuck side and the rotation center side, the thickness of the pipe was changed from 0.5m to 1mm to increase rigidity.

According to the present invention, even if the workpiece is held in an inclined state during chucking, it is possible to prevent the accumulation of internal stress in the workpiece that occurs when force is applied to correct the inclination.

〔Example〕

Hereinafter, embodiments of the magnetic roller processing method according to the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a front view showing a section of a part of an apparatus used in a processing method according to a first embodiment of the present invention. The workpiece is a workpiece, and the workpiece 1 is composed of a vibrator 2, a left flange 3, and a right flange 4. The vibrator 2 is made of 5US303 and has a wall thickness of 1-1. A magnet 5 is built inside the vibrator 2, and the magnet 5 is rotatably held by a bearing 6. There are left flanges 3 on both ends of the vibe 2.
and the right flange 4 are press-fitted or bonded.

A B axis and a D axis are formed on the opposite side of the left flange 3 from the vibe 2. A C-axis is formed on the opposite side of the right flange 4 from the vibe 2. Furthermore, left and right flanges 3.
Bearings are installed on the B and C axes of 4 (not shown),
The workpiece 1 itself is configured to be rotatable. colette 7
The chuck shape is formed so that when the D axis is chucked, the contact width Q is 1- or less.

The processing method using the device with the above configuration is to
The D axis of the left flange 3 is chucked to the main shaft side collet 7 of an N/C lathe (not shown), and the right flange 4 is received by the rotation center 8 and the workpiece 1 is rotated.Next, using the cutting tool 9, The B-axis of the left flange 3, the outer peripheral surface of the vibrator 2, and the C-axis of the right flange 4 are simultaneously cut with one chuck (the workpiece is not attached or detached during these processes).

According to this embodiment, B of the left and right flanges 3.4.

The deflection of the outer peripheral surface of the vibrator 2 with respect to the axis of the C-axis was able to satisfy the required accuracy of 5 μ-.

In this example, 5US303 was used as the material for the vibrator 2, but in order to minimize the cutting resistance (taking into consideration the lability), this material has better machinability than SUS304 (
SUS303 (low cutting resistance) is used.

(Second Embodiment) FIG. 2 is a front view showing a section of a part of an apparatus used in a processing method according to a second embodiment of the present invention.

In this embodiment, the N/C lathe in the first embodiment is replaced with an N/C lathe in the first embodiment.
The difference is that the C grinding machine is used, and the cutting tool 9 is replaced by a grinding wheel 10, and the other configurations are the same, so the same components are given the same numbers and the explanation thereof will be omitted.

The operation of this embodiment is similar to that of the first embodiment, and its explanation will be omitted.

According to this embodiment, the same effects as in the first embodiment can be obtained, and the material of the vibrator is not limited to 5US303 as in the case of cutting in the first embodiment, but may be 5US304 in the case of grinding. This 5US304 is a material that is extremely readily available and has a low material cost, so it has the effect of greatly reducing costs.

〔Effect of the invention〕

According to the present invention, the accuracy of the deflection of the outer circumferential surface of the pipe of the magnet roller with respect to the axis of the left and right flange shafts can be kept within 5 μm. As a result, it is possible to significantly improve the change in the gap size (runout) between the drum and the magnet roller built into the ion printer, and improve the image quality of the printer in terms of distortion of characters and symbols, print density, etc.

[Brief explanation of drawings]

Figure 1 shows the first magnetic roller processing method according to the present invention.
FIG. 2 is a front view showing a part of the apparatus used in the second embodiment in cross section; FIGS. 3 to 8 show conventional examples; Fig. 3 is a schematic configuration diagram of the ion printer, Fig. 4 is a front view showing a section of a part of the magnetic roller, Fig. 5 is a vertical sectional view of the vibrator, Fig. 6 is a front view of the right flange, Fig. 7 The figure is a front view of the magnetic roller, and FIG. 8 is a front view showing a part of the device in cross section. 1... Work 2... Pipe 3... Left flange 4... Right flange 5... Magnet 6... Bearing 7... Collet 8... Rotation center 9... Cutting tool 10・−・Grinding whetstone

Claims (1)

[Claims] (1) The flange at one end of the magnetic roller in the developing device that visualizes the electrostatic latent image on the drum is chucked to the collet on the spindle side of a lathe or grinder, and the flange at the other end is pressed by the rotation center. In the magnetic roller machining method, in which the spindle of the flanges on both sides and the outer circumferential surface of the pipe are machined in one chuck using a machining tool, the collet on the main shaft side of the lathe or grinder is held rotatably by a magnetic roller with a chuck width of 1 mm or less. A magnetic roller processing method characterized by holding the flange.