JPH073409Y2 - Image forming device developing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a developing device provided in an image forming apparatus.

[Conventional technology]

2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine is provided with a developing device that develops an electrostatic latent image formed on the surface of a photoconductor with a developing roll.

A regulating member for regulating the developer attached to the developing roll is provided near the developing roll.

As shown in FIG. 5, the conventional regulating member 9 is attached via a screw d to a supporting member c provided near the developing roll b, and the regulating amount of the developer is regulated to the surface of the developing roll b. It is determined by the gap e between the tips of the members a.

Therefore, conventionally, a long hole f is provided on the side of the restriction member a, and the restriction member a is vertically adjusted along the long hole f,
The gap e is adjusted so that the developer supply amount is appropriate.

As a method of adjusting the gap, a shim is inserted between the developing roll b and the regulating member a in a state where the screw d is loosened so that the regulating member a can move.
With setting, the screw d is tightened to fix the regulating member a.

[Problems to be solved by the invention]

However, in the above-mentioned conventional method, in order to adjust the gap e with high accuracy, it is necessary to strongly sandwich the shim between the developing roll b and the regulating member a. Therefore, when the shim is removed after fixing the regulating member a, the developing roll b is removed. If the surface or the tip of the regulating member a may be damaged and the shim sandwiched between the developing roll b and the regulating member a is inclined, the adjusted gap e
There was a problem that the adjustment could not be performed with high accuracy due to the variation in.

[Means and Actions for Solving Problems]

The present invention has been made for the purpose of improving the above-mentioned problems, and a flow rate regulation for regulating the amount of the developer supplied to the developing roll is provided in the vicinity of the developing roll for developing the electrostatic latent image formed on the photoreceptor surface. In a developing device in which a member is movable back and forth in the developing roll direction, a flow rate adjusting member is provided at the tip of the flow rate regulating member so as to protrude by the same length as an appropriate gap formed between the developing roll and the flow rate regulating member in advance. By providing a gap adjusting member which is combined with a pair of the above and the gap adjusting member so as to be movable back and forth on one surface of the flow rate regulating member, the gap between the developing roll and the flow rate regulating member can be easily made by the gap adjusting member. It is an object of the present invention to provide a developing device of an image forming apparatus capable of adjusting to a proper gap.

〔Example〕

An embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 is a photosensitive member provided in an image forming apparatus such as a copying machine, and 2 is a developing device main body installed in the vicinity thereof. 1 has a developing roll 3 for developing the electrostatic latent image formed on the surface thereof.

The developing roll 3 has a circumferential surface magnetized with a large number of poles,
A developer contained in the housing 4 is adsorbed on the peripheral surface, and a flow rate regulating member 5 for regulating the developer adsorbed on the developing roll 3 to a constant flow rate is provided near the developing roll 3. Has been.

The flow rate regulating member 5 has a plate-like shape, and a plurality of elongated holes 5a elongated in the width direction are formed on the base end side at equal intervals in the length direction, and the fasteners inserted into these elongated holes 5a. It is attached to a supporting portion 4a projectingly provided on the inner surface of the housing 4 by means of 6 so as to be movable and adjustable.

Further, a gap adjusting member 7 is attached to the upper surface of the flow rate regulating member 5 on the tip side in advance.

The gap adjusting member 7 is made of a thin plate processed with high precision, and a plurality of long holes 7a elongated in the width direction are formed at intervals in the length direction, and fixed by being inserted into the long holes 7a. It is fixed to the upper surface of the flow rate regulating member 5 by means of a tool 8 so that the distance from the tip of the flow rate regulating member 5 to the tip of the gap adjusting member 7 becomes an appropriate gap t.

Next, the operation will be described. When adjusting the gap t between the peripheral surface of the developing roll 3 and the tip of the flow rate regulating member 5 to be an appropriate value, first, a jig or the like is used for the flow rate regulating member 5 to adjust the gap. After mounting 7 with high accuracy, flow rate regulating member 5
Is temporarily attached to the support portion 4a by the fixing tool 6, and in this state, the flow regulating member 5 is position-adjusted so that the tip of the gap adjusting member 7 is evenly contacted with the peripheral surface of the developing roll 3, and then the first fixing tool 6 is used. As shown in the figure, the support portion 4a is fixed.

After that, the fastener 8 fixing the gap adjusting member 7 is loosened, the gap adjusting member 7 is retracted to the position shown in FIG. The gap between the developing roll 3 and the flow rate regulating member 7 can be adjusted to the accurately adjusted gap width t.

Note that FIG. 4 shows another embodiment, in which stepped portions 5b and 7b which are engaged with each other are formed on the upper end side upper surface of the flow rate regulating member 5 and the lower end side lower surface of the gap adjusting member 7, The steps 5b and 7b are accurately manufactured in advance so that the distance between the tip of the flow rate regulating member 5 and the tip of the gap adjusting member 7 matches the proper gap t when the steps 5b and 7b are engaged.

As a result, the positioning between the two members can be performed accurately without using a jig or the like, and when the gap t is readjusted, the gap adjusting member 7 reaches the position where the step portions 5b and 7b engage with each other. You can easily readjust the gap just by moving forward.

[Effect of device]

As described in detail above, the present invention adjusts the protrusion amount of the gap adjusting member to the optimum gap value outside the machine before mounting the flow rate regulating member, so that the gap when mounting the flow rate regulating member. The gap between the developing roll and the flow rate regulating member can be adjusted to an optimum value simply by abutting the tip of the adjusting member against the developing roll.

As a result, the gap adjustment can be performed accurately in a short time without requiring any skill, and since it is not necessary to use a shim or the like, the shim after the adjustment damages the surface of the developing roll or the tip of the flow rate controlling member. There is no fear.

Further, since the gap adjusting member moves back and forth over one surface of the flow rate regulating member, there is almost no need for a space for retracting and holding the gap adjusting member after the adjustment, whereby the developing device has a small space around the flow rate regulating member. In addition, the gap adjusting member can be easily configured and can be provided at low cost.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a perspective view of a flow rate regulating member, FIG. 3 is an operation explanatory view, and FIG. 4 is an explanatory view showing another embodiment. FIG. 5 is a conventional explanatory view. Reference numeral 1 is a photoconductor, 3 is a developing roll, 5 is a flow rate regulating member, and 7 is a gap adjusting member.

Claims (1)

[Scope of utility model registration request] 1. A flow regulating member 5 for regulating the amount of developer supplied to the developing roll 3 is provided in the vicinity of the developing roll 3 for developing the electrostatic latent image formed on the surface of the photoconductor 1 in the developing roll 3 direction. In the developing device that can be moved back and forth, a flow rate adjusting member is provided at the tip of the flow rate regulating member 5 so as to protrude by the same length as an appropriate gap t previously formed between the developing roll 3 and the flow rate regulating member 5. A developing device for an image forming apparatus, which is provided with a pair of gap adjusting members 7 and which is provided so as to be capable of advancing and retracting on one surface of the flow rate regulating member 5.