JPH048434Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a blender for a developing machine, and specifically relates to the manner in which the blades are attached.

(Prior Art) FIG. 3 shows a developing machine based on a dry two-component developing method. The developer C staying in the casing B of the developing machine A rotates (in the direction of arrow V).
The toner and carrier are triboelectrically charged by the blender D, and the toner and carrier are uniformly stirred and mixed. Next, the developer C is sent to the magnet roll F by the paddle wheel E rotating in the direction of arrow W, and the developer C is further sent to the drum G by the magnet roll F rotating in the direction of arrow X. . Here, the electrostatic latent image on drum G is developed with developer C. The drum G rotates in the direction of arrow Y, and a well-known transfer process is performed. On the other hand, after development, the surplus developer C is sent back into the casing B by the magnet roll F, and is again transferred to the blender D.
The mixture is stirred and mixed, and triboelectrically charged. Incidentally, the insufficient toner is appropriately supplied into the casing B as shown by arrow Z, and the toner content of the developer C is always adjusted to an appropriate value.

(Problem to be solved by the invention) By the way, the blender D stirs the toner and the carrier to give the developer C a predetermined amount of charge,
In addition, in order to make the toner content of the developer C uniform in the axial direction, a plurality of blades I, . . . are attached at an angle with respect to the rotating shaft H, as shown in FIG. As shown in FIG. 5, the blender D having the above-mentioned structure has been conventionally constructed such that a predetermined number of blade blocks K, which are integrally molded blades I and a hub J, are attached to a rotating shaft H.
It was manufactured by fitting it into the However, the above feather I
Since the impeller block K is usually made of a zinc alloy, the entire impeller block K becomes heavy, which may cause the rotating shaft H to bend and make it impossible to uniformly stir the developer C.

The blender D shown in FIG. 6 is manufactured by sequentially fitting plate-shaped blades I made of an aluminum alloy and tubular spacers L made of aluminum onto a rotating shaft H. By using the spacer L, the deflection of the rotating shaft is eliminated. In the above configuration, both end surfaces ₁ and ₂ of the spacer L are formed to be inclined with respect to the central axis of the spacer L, and the adjacent spacers L,
By sandwiching the blade I between the end surfaces ₁ and ₂ of L, the blade I is attached at an angle with respect to the rotation axis H, and a notch is formed in one section of the rotation axis through hole M of the blade I. One end surface of spacer L to N
By fitting the convex portion O formed in ₁ and fitting this convex portion into the concave portion P formed on the other end surface ₂ of the spacer L, the spacer L and the blade I are connected.
Positioning is being carried out.

By the way, if the inclinations of the opposing end surfaces ₁ and ₂ of the adjacent spacers L and L are greatly different due to factors such as a processing error, the blade I will move in the direction of the arrow Q as shown in FIG. As shown in , there is a large wobble in the direction in which the slope changes. Further, if there is a gap between the rotating shaft H and the rotating shaft through hole M, the blade I will have play in the direction shown by the arrow R. If there is any play as described above, the blade I will be fixed at a position offset by the play when assembling the blender of the developing machine. If the position of the blade I with respect to the rotation axis H is offset, a force that tries to convey the developer C in the axial direction of the rotation axis H may act due to the action of stirring the developer C, and the developer The amount of C became non-uniformly distributed, and there was a risk that the image quality would be significantly degraded.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a blender for a developing machine that can prevent blade rattling as much as possible.

(Means and effects for solving the problem) Therefore, in the present invention, pressing protrusions are formed on the end faces of the spacer, and the side surfaces of the blades forming an obtuse angle with respect to a pair of generatrix lines sandwiching the central axis of the rotating shaft are By pressing with a pressing protrusion, the edges of the rotating shaft through hole on the side surface of the blade forming an acute angle with respect to the pair of generating lines are brought into contact with the surface of the rotating shaft, and the blade is clamped and fixed between the rotating shaft and the spacer. The above objectives have been achieved.

(Example) Hereinafter, the present invention will be described in detail based on the drawings showing one example.

1 and 2 show a blender of a developing machine according to the present invention. This blender 1
is a plate-shaped blade made of aluminum alloy 2
and a tubular spacer 3 made from aluminum.
and are manufactured by sequentially fitting them onto the rotating shaft 4, and this structure itself is basically the same as the conventional blender shown in FIG. 6, and the blender 1 achieves mass metering. The blade 2 has a shape in which a tongue piece is erected on the peripheral edge on the minor axis side of an elliptical plate, and an elliptical rotation shaft through hole 5 is provided in the center of the blade 2.
(hereinafter referred to as a through hole 5) is formed.
Note that the dimension of the short axis of this through hole 5 is set to be approximately the same as the diameter of the rotating shaft 4. Further, a notch 6 is formed in one area of the periphery of the through hole 5. On the other hand, the spacer 3 has its end surface 3
a and the end surface 3b are both inclined with respect to the central axis of the spacer 3 and are formed substantially parallel to each other. In addition, on both end surfaces 3a and 3b, pressing protrusions 3c and 3d are provided extending along the central axis at end surface portions that form acute angles with respect to the central axis of the spacer 3, respectively. Furthermore, the end surfaces 3e and 3f of both the pressing protrusions 3c and 3d are formed to be inclined with respect to the above-mentioned central axis and to be substantially parallel to each other. Further, an engagement protrusion 3g extending along the central axis direction is formed on the pressing protrusion 3d, while an engagement recess 3h extending similarly along the central axis direction is cut out in the end surface 3a. .

Now, when manufacturing the blender 1 with the above configuration,
First, the spacer 3 is fitted onto the rotating shaft 4, and then the blade 2 is fitted onto the rotating shaft 4. Further, another spacer 3 is fitted so as to sandwich the blade 2, and then the blade 2 and the spacer 3 are alternately attached to the rotating shaft 4, thereby assembling the blender 1. Further, at this time, the blade 2 is prevented from rotating by fitting the engagement protrusion 3g of the spacer 3 into the notch 6 of the blade 2 and the engagement recess 3h of the adjacent spacer 3.

Now, from the state where the spacer 3, the blade 2, and the other spacer 3 are simply fitted onto the rotating shaft 4, when the spacers 3 are brought closer to each other, the blade 2 becomes as shown in FIGS. 1a and 1b. It is pressed by the pressing protrusions 3c and 3d and is inclined with respect to the central axis 4a of the rotating shaft 4. Here, when looking upward in the figure from the central axis 4a, the generating line 4b of the rotating shaft 4 at the blade 2
The side surface 2a forming an obtuse angle α with respect to the blade 2 is pushed to the right by the pressing protrusion 3d of the spacer 3 on the left side in the figure, thereby forming an acute angle β with the opposite surface 2b of the blade 2, in other words, with the generatrix 4b. The opening edge 5a of the through hole 5 on the side surface 2b is connected to the rotating shaft 4.
It comes into contact with the peripheral surface 4c of. On the other hand, the central axis 4a
Looking further down in the figure, the side surface 2b of the blade 2, which forms an obtuse angle with respect to the generatrix 4d that faces the generatrix 4b across the center axis 4a, is pushed to the left by the pressing protrusion 3c of the spacer 3 on the right side in the figure. The opening edge 5b of the through hole 5 on the side surface 2a forming an acute angle with respect to the generatrix 4d comes into contact with the circumferential surface 4c of the rotating shaft 4. In this way, the blade 2 is sandwiched between the adjacent spacer 3 and the rotating shaft 4, and
This means that it can be installed without wobbling or shifting.

In this example, the rotating shaft through hole 5 in the blade 2 is formed in an elliptical shape, but it may also be a rectangular hole. In this case, the length of the short side of the hole is approximately equal to the diameter of the rotating shaft. It goes without saying that the length of the long side is set so that when the blade is tilted at a predetermined angle with respect to the rotation axis, the short edge portion comes into contact with the circumferential surface of the rotation axis.

(Effects of the invention) As detailed above, according to the blender of the developing machine according to the invention, between the spacer and the rotating shaft,
Since the blades are clamped and fixed, even if there are variations in the shape of each spacer due to processing errors, the blades are held without play between the spacer and the rotating shaft. Thus, according to the present invention, deviation of the blades relative to the rotating shaft due to looseness of the blades is prevented as much as possible, and the distribution of the developer along the axial direction of the rotating shaft is maintained uniformly.

[Brief explanation of drawings]

1 is a diagram showing the main parts of a blender of a developing machine according to the present invention, a is a side view, b is a sectional side view, FIG. 2 is an exploded perspective view of the blender according to the present invention, and FIG. is a conceptual cross-sectional side view of a developing machine based on a dry two-component developing method, FIG. 4 is a conceptual front view of a blender, FIG. 5 is an exploded perspective view of a blender with a conventional structure, and FIG. FIG. 7 is an exploded perspective view of a conventional blender, and FIG. 7 is a sectional side view of a main part of the blender shown in FIG. 6. 1... blender, 2... feather, 2a, 2b...
Side surface, 3... Spacer, 3a, 3b... End surface, 3
c, 3d...pressing protrusion, 3g...engaging protrusion, 3h
...Engagement recess, 4... Rotating shaft, 4a... Central axis, 4b, 4d... Generatrix, 4c... Circumferential surface, 5...
Rotating shaft through hole, 5a, 5b...through hole edge.

Claims (1)

[Scope of utility model registration request] Blades that are plate-shaped and have a rotation shaft through hole formed therein and a tubular spacer are alternately inserted into the rotation shaft, and the end surfaces of adjacent spacers are used to push the blades against the rotation shaft. In the blender of the developing machine, which is held at an angle, a pressing protrusion is formed on the end face of the spacer, and the side surfaces of the blades forming an obtuse angle with respect to a pair of generatrix lines sandwiching the central axis of the rotating shaft are pressed against each other. The ends of the pressing protrusions are pressed to bring the edges of the rotary shaft through holes on the side surfaces of the blades, which form an acute angle with the pair of generatrix lines, into contact with the circumferential surfaces of the rotary shafts, respectively, so that the blades are pressed against the spacer and rotated. A blender for a developing machine characterized by being clamped and fixed by a shaft.