JPH0350528Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Application of the Invention This invention relates to a developing device for a copying machine, and particularly to a developing device for a copying machine capable of multicolor printing or color selection.

(B) Prior Art As a developing device for a copying machine as described above, one is known that uses a plurality of developing boxes each containing a different color developer and a magnetic brush built in at a predetermined position. In such a developing device, in order to prevent the developer from mixing colors or from scraping off the first color developer on the photoreceptor drum by the first color magnetic brush when developing the second color, It has been proposed to rotate a magnet roll forming a magnetic brush to shift the main pole that is not used for development (Japanese Patent Application No. 34469/1982).

(c) Problems to be solved by the invention However, simply rotating the main pole cannot necessarily change the height of the "spikes" of the magnetic brush developer; Therefore, the above-mentioned prevention of color mixing of the developer and prevention of scraping of the developer by the magnetic brush cannot be guaranteed. In particular, when a large number of transport poles are arranged relative to the main pole in a magnet roll, even if the main pole is rotationally deviated from the photoreceptor drum, the transport poles will be close to the photoreceptor drum, resulting in a high "stiffness". The above-mentioned problem was a big problem because it was not possible to change the temperature significantly.

(d) Means for solving the problem and its effect This invention consists of a photoconductor drum that is rotatably supported within the main body of the copying machine, and a magnetic brush that is supported so as to be able to swing along the photoconductor drum. two or more developing boxes containing developers of different colors, positioning means for removably receiving these developing boxes in the developing position, wheels supported near the developing boxes, and a reciprocating rotation drive means, one end of which is rotatably supported on a side surface of the wheel excluding the center thereof, the other end of which is engaged with each development box, and one development box is sequentially switched by operation of the reciprocation rotation drive means; This developing device for a copying machine is composed of the same number of rods as developing boxes, which leave the developing boxes at a developing position and move other developing boxes away from corresponding positioning means to non-developing positions.

That is, this invention makes the developing box swingable and rotatable, and by combining this with a specific link rod and wheel, the developing box itself can be forcibly moved away from the photoreceptor drum during non-developing time. As a result, undeveloped developer may adhere to the surface of the photoreceptor drum, causing color mixing, or
This is intended to prevent the magnetic brush from scraping off the developer adhering to the surface of the photosensitive drum during non-developing.

(E) Embodiments This invention will be described in detail below based on embodiments shown in the drawings. Note that this invention is not limited to this.

First, in FIGS. 1 to 3, particularly in FIG. 3, a developing device 1 of a two-color copying machine F includes a photoconductor drum 3 rotatably supported within a copying machine main body 2, and a photoconductor drum 3 along the photoconductor drum 3. It mainly consists of a developing section 4 installed along with the developing section 4. The main body 2 further includes an optical system 5 installed on the upper part thereof, a main charging means 6, a transfer means 7, a peeling means 8, and a cleaning means 9, which are provided along the photosensitive drum 3 together with the developing section 4, and a transferred image. It includes a paper feeding means 10 and a transfer paper supplying means 11.

The developing section 4 is supported so as to be able to swing along the photosensitive drum 3, and has upper and lower developing boxes 16 each containing magnetic brushes 12 and 13 at predetermined positions, as well as developers 14 and 15 of different colors. ,1
7, and especially in FIG. 1, protruding shafts 18, 19 formed on the side walls of each developing box 16, 17 and holders for these projecting shafts in order to removably receive these developing boxes at the developing position. 20,
21, a lower developing box 17, a wheel 22 supported below, a worm gear 23 for reciprocating rotation of this wheel, and its drive motor 24.
It mainly consists of left and right connecting rods 25 and 26 that connect the wheel 22 and each developing box 16 and 17.

The right connecting rod 26 is a substantially vertical rod-shaped body, and has a vertically long elongated hole 27 in its upper portion.The upper end supports the engagement protrusion 26 formed in the upper developing box 16, and the lower end supports the wheel 22. Rotating pin 29 on the right side of the
The elongated hole 27 is further closed to the upper developing box 1.
It is slidably engaged with the pin 30 of No. 6. The left connecting rod 25 connects the lower developing box 17 and the wheel 22.
are connected in the same manner as the right connecting rod 26, and a detailed explanation thereof will be omitted.

In addition, 31 and 32 are upper and lower development boxes 16,
17 swing support shafts.

Thus, as shown in FIG.
6 at the non-developing position, and therefore the lower developing box 17 at the developing position, when developing with a developer (for example, black), the magnetic brush 12 of the upper developing box 16 is sufficiently separated from the surface of the photoreceptor drum 3. This prevents color mixing and developer from being scraped off.

Next, when performing development with another developer (for example, red), the drive motor 24 rotates the wheel 22 in the direction of arrow A via the worm gear 23, thereby moving the upper development box 16 to the development position indicated by the dashed-dotted line. , the lower developing box 17 is moved to the non-developing position indicated by the two-dot chain line. That is, as the wheel 22 rotates, the right connecting rod 26 descends in the direction of arrow B, and accordingly, the upper developing box 16 descends in the direction of arrow C, and the protruding shaft 18 engages with the receiving tool 20 to move to a predetermined developing position. Positioned. The lower developing box 17 is connected to the above-mentioned right connecting rod 26 that moves downward.
On the contrary, it is positioned at the non-developing position by the rising left lever 25.

(f) Effects of the invention This invention prevents the developer that is not being developed from adhering to the surface of the photoreceptor drum and causing color mixing, and the developer that is being scraped off the surface of the photoreceptor drum by the magnetic brush that is not being developed. You can definitely prevent dripping.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main parts of a developing device of a copying machine according to this invention, FIG. 2 is a partially enlarged explanatory perspective view thereof,
FIG. 3 is a schematic explanatory diagram of the entire copying machine. 1... Copying machine developing device, 2... Copying machine main body,
3... Photosensitive drum, 4... Developing section, 12, 13
...Magnetic brush, 14,15...Developer, 16,
17... Upper and lower developing boxes, 18, 19... Protruding shaft, 20, 21... Receptacle, 22... Wheel, 25, 26... Left and right connecting rods.

Claims (1)

[Claims for Utility Model Registration] 1. A photoconductor drum rotatably supported within the main body of a copying machine, a magnetic brush that is swingably supported along the photoconductor drum, and has a built-in magnetic brush in a predetermined position. Two or more developing boxes containing developer, a positioning means for removably receiving these developing boxes at a developing position, a wheel supported in the vicinity of the developing boxes, and a reciprocating rotation driving means for the wheel, one end of which is connected to the developing box. rotatably supported on the side of the wheel except for the center;
The other end engages with each development box, and by the operation of the reciprocating rotation driving means, one development box is sequentially switched and left in the development position, and the other development box is separated from the corresponding positioning means and placed in the non-development position. A developing device of a copying machine consisting of a moving developing box and the same number of rods. 2. Each of the connecting rods is a substantially vertical rod-like body with a longitudinally long slot formed in its upper part, and its lower end is rotatably pinned to the side of the wheel except for the center, and each developing box is attached to the side wall of the wheel. , a pin that slidably engages with the elongated hole of a corresponding connecting rod, and a protrusion that engages with the upper end of each connecting rod.