JPH0240670A - Developing device for printer - Google Patents

Abstract

PURPOSE:To readily fit and to improve the accuracy and durability of the developing device even at the time of changing condition by interposing a pressing means between a doctor blade an a developing unit main body and mounting it to the developing unit at the both ends of the doctor blade. CONSTITUTION:The title device is provided with the doctor blade 51 for toner regulation which is adjacent to the outer surface of a drum-shaped sleeve 50 and which is disposed along the central axis of the sleeve 50 and a doctor blade adjusting piece 54 which is fixed firmly to the blade 51 and whose tip abuts on the outer surface of the sleeve 50 at the both ends of the blade 51. The means 1 with presses the blade to the side of the sleeve 50 is interposed between the blade 51 and the developing unit main body 100. Furthermore, the blade 51 is permitted slight reciprocating motion to the side of the sleeve 50 and mounted to the developing unit main body 100 at its both ends. As a result, fitting can be readily carried out and the value of the doctor blade can be fixingly set even when peripheral condition changes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device for a printer, and particularly to a developing device for a printer equipped with a doctor blade for regulating the amount of toner supplied.

[Conventional technology]

Conventional examples are shown in FIGS. 7 to 9. In the conventional example shown in these figures, when toner is supplied to the drum-shaped sleeve 50, a doctor blade 51 disposed along the sleeve 50 is used to keep the supply amount constant. It has become.

In this case, the tip edge of the doctor blade 51 and the sleeve 5
The gap between 0 and 0 is called a doctor blade value (hereinafter referred to as "D value"), and is set to a predetermined value of 1 [Peng] or less. Here, the reference numeral 59 shown in FIG.
indicates an R spacer that is attached to the doctor blade side and determines the fixed angle of the doctor blade.

The conventional DB initial setting of the doctor blade 51 includes a screw 53 for attaching the doctor blade 50 to the developing device main body 100 and a thickness gauge or a D value set.
The B adjust 54 is sandwiched between the doctor blade 51 and the sleeve 50 at both ends of the doctor blade 51,
The D8 value was thereby adjusted and the screw 53 was tightened again.

[Problem to be solved by the invention]

However, in the above conventional example, after adjusting the D value, the doctor blade must be manually pressed against the sleeve to tighten the screws, and in many cases, the left and right screws must be tightened manually. Since it is not possible to stop and stop at the same time, the pressing force on the left and right sides is not constant, causing the inconvenience of being difficult to set.

Furthermore, when distortion occurs due to a change in the temperature of the developing device, the doctor blade is directly distorted, resulting in the inconvenience that the DB value once set changes.

[Purpose of the invention]

An object of the present invention is to improve the disadvantages of the conventional example, and in particular, to be able to easily set the DB value even when the surrounding conditions change, thereby improving the accuracy and durability of the developing device. An object of the present invention is to provide an improved developing device for a printer.

[Means to solve the problem]

The present invention has a drum-shaped sleeve and a doctor blade for toner regulation disposed close to the outer surface of the drum-shaped sleeve and along the central axis of the drum-shaped sleeve, and has both ends of the doctor blade. In a developing device for a printer, which is equipped with a DB adjustment piece that is fixed to the doctor blade and whose tip abuts on the outer surface of the drum-like sleeve, a pressing means for pressing the doctor blade toward the drum-like sleeve is attached to the doctor blade. The doctor blade is interposed between the blade and the developing device main body, and is configured such that the doctor blade is allowed to move slightly back and forth toward the drum-shaped sleeve and is attached to the developing device main body at both ends thereof. There is. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. Here, the same reference numerals are used for the same constituent members as in the conventional example described above.

The embodiment shown in FIGS. 1 to 6 includes a drum-shaped sleeve 50 and a toner regulating doctor disposed close to the outer surface of the drum-shaped sleeve 50 and along the central axis of the drum-shaped sleeve 50. It has a blade 51.

At both ends of this doctor blade 51 are sleeves 5 which are fixed to the doctor blade 51 and have a drum-like tip.
A D11 adjustment piece 54 that is structured to abut on the outer surface of the D11 is provided.

In addition, this doctor blade 51 is attached to a drum-shaped sleeve 5.
A pressing means 1 for pressing toward the 0 side is interposed between the doctor blade 51 and the developing device main body 100. The doctor blade 51 is allowed to move slightly back and forth toward the sleeve 50 and is engaged with the developing device main body 100 at both ends thereof.

D! equipped on the left and right sides of the doctor blade 51 (both ends of the doctor blade 51) in FIG. The adjustment pieces 54, 54 are fixed by heat welding. Also,
In this embodiment, a sponge is used as the pressing means 1.

This pressing means 1 is located at the R
It is mounted on the spacer 59. This R spacer 59
is thermally welded to the doctor blade 51.
FIG. 1 shows a state in which a doctor blade 51 formed as shown in FIGS. 2 and 3 and a pressing means 1 equipped thereon are attached to a developing device main body 100.

In this case, the doctor blade 51 and the drum-shaped sleeve 5
The D8 adjustment pieces 54 and 54 are sandwiched between the D8 adjustment pieces 54 and 0, and at the same time, the sponge serving as the pressing means 1 is crushed against the inner surface of the developing device main body 100. As a result, a predetermined reaction force is accumulated in the pressing means 1, which causes the D11 adjustment piece 54.5 to
The entire doctor blade 51 including the doctor blade 4 is constantly pressed toward the drum-shaped sleeve 50 side.

Furthermore, the doctor blade 51 is locked to the developing device main body 100 by the stopper member 5.

Specifically, the lengths 51B, 51B in the direction orthogonal to the longitudinal direction of the doctor blade 51 are attached to the doctor blade 51 portion near where the Di adjustment pieces 54, 54 are attached.
is formed. The stopper member 5 is connected to the doctor blade 51 through this elongated hole 51B as shown in FIG.
The doctor blade 51 is moved toward the developing device main body 10 while only allowing reciprocating movement in the direction B (movement in the B direction is prevented).
A method of locking it at 0 is adopted.

Therefore, during actual assembly, the doctor blade 51 is simply attached to the developing device body 1 as shown in FIGS. 1 and 6.
00 and locking with the stopper member 5, the DB value is set by the pressing force against the doctor blade 51 generated by the pressing means 1 and the developing device main body 100.

[Effects of the Invention] As described above, according to the present invention, the doctor blade is always slightly pressed against the drum-shaped sleeve by the action of the stopper member and the pressing means. It is possible to maintain the preset DB value even if the surrounding environmental conditions change due to the DLL adjustment piece that is attached to the DB.As a result, even if the entire device is used continuously, the accuracy will decrease. It is possible to provide an unprecedented and excellent developing device for a printer in which such a situation does not occur and the DB durability is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
Figure 3 is a front view showing the doctor blade part used in Figure 3. Figure 3 is a sectional view taken along line III-I in Figure 2.
The figure is a side view seen from the same position as in Figure 1, Figure 5 is an explanatory diagram showing the installed state of the doctor blade, and Figure 6 is a sectional view showing the doctor blade portion along the line Vl-Vl in Figure 5. Fig. 7 is a side view showing the conventional example, Fig. 8 is an explanatory view showing the attached state of the doctor blade in the conventional example, and Fig. 9 is a sectional view showing the doctor blade portion along line IX-IX in Fig. 8. It is. l...pressing means, 50...drum-shaped sleeve, 51...doctor blade, 54...
...Da adjustment piece, 100...Developer device main body. Figure 1

Claims (1)

[Claims] (1) It has a drum-shaped sleeve and a doctor blade for toner regulation disposed close to the outer surface of the drum-shaped sleeve and along the central axis of the drum-shaped sleeve, and both ends of the doctor blade In a developing device for a printer equipped with a D_B adjustment piece that is fixed to the doctor blade and has a structure in which a tip part contacts the outer surface of the drum-like sleeve, a pressing means for pressing the doctor blade toward the drum-like sleeve side, The doctor blade is interposed between the doctor blade and the developing device main body, and the doctor blade is allowed to reciprocate slightly toward the drum-shaped sleeve and is attached to the developing device main body at both ends thereof. A developing device for a printer characterized by the following.