KR200462940Y1 - Driving power transfer structure of image forming apparatus, photosensitive drum assmembly and processing cartridge using same - Google Patents

Abstract

The present invention relates to a structure for transmitting rotational driving force of an image forming apparatus and a process cartridge using the same, wherein the first jamming projection is twisted while the three first jamming projections located at the distal end of the insertion column are in contact with the torsion surface of the torsion triangle hole. The first jammer can be prevented as the photosensitive drum is separated from the first axis of the image forming apparatus main body by being pulled into the triangular hole while at the same time the first jammer is inserted deeply into the torsion triangle hole by a predetermined depth. A second locking projection having a rotational deviation by the torsion angle of the torsion triangle hole is inserted into the torsion triangle hole while contacting the torsional surface of the inlet side of the torsion triangle hole so as to be spaced in the depth direction near each vertex of the torsion triangle hole. The first shaft and drive assembly are stable at all six contact positions Since the photosensitive drum is rotationally driven in contact with the photosensitive drum, the rotational driving force transmission structure of the image forming apparatus capable of reliably transmitting the rotational driving force to the photosensitive drum side while minimizing the loss of the rotational driving force transmitted from the image forming apparatus and the process cartridge using the same To provide.

Description

Rotation driving force transmission structure of image forming apparatus, photosensitive drum assembly and process cartridge using the same {photovoltaic imaging assembly process and photographic drum assembly using the same) {SENSITIVE DRUM ASSMEMBLY AND PROCESSING CARTRIDGE USING SAME}

The present invention relates to a driving force transmission structure for rotating the photosensitive drum from the main body of the image forming apparatus and a process cartridge using the same. More specifically, the photosensitive drum side is rotated while minimizing the loss of the driving force transmitted from the image forming apparatus. To the rotational drive force transmission structure of the image forming apparatus that can deliver a constant rotational driving force constantly even if there is a difference in the torsion slope of the triangular torsion hole of the main body of the image forming apparatus. It is about.

In general, an image forming apparatus is a device for printing a character or an image on a recording material such as paper, such as a copier, a laser printer, an inkjet printer, an LED printer, a facsimile or the like.

As shown in Fig. 1, such an image forming apparatus includes a cartridge 100 for storing toner and supplying toner to a recording material, so that a plurality of rollers 73, 74 provided in the main body 1 of the image forming apparatus. , 75, 76, 77 while feeding the recording material such as paper in the direction indicated by the reference numeral 88s, and at the same time transferring data such as an image to be printed to the cartridge 2, installed in the cartridge 2 The toner stored in the toner reservoir through the organic photoconductor drum 11 (hereinafter referred to simply as the 'photosensitive drum') is transferred to the recording material as necessary, so as to print an intended image or the like on the recording material.

To this end, the process cartridge 100 includes a photosensitive drum 11, a cleaning unit, a writing unit, and a developing unit, so that when the charge reaches the photosensitive drum 11, photosensitization is performed. After the toner is electrodeposited on the photosensitive portion, the toner is operated to transfer the toner on paper and heat to fix the image on the paper.

On the other hand, when the process cartridge 100 of FIG. 2 storing the toner to be transferred to the recording material is inserted into the main body 2 of the image forming apparatus, projections protruding to one side of the photosensitive drum 11 of the process cartridge 100 are provided. The first shaft 21p is inserted into the triangular torsion hole 181 of the first shaft 180 of the main body 2 of the image forming apparatus and rotated by a drive motor in the main body 2 of the image forming apparatus. As the 180 rotates, the triangular twisting hole 181 of the first shaft 180 and the protrusion 21p are engaged with each other to rotate, and the photosensitive drum 11 also rotates.

According to Korean Patent Publication No. 258609, the configuration shown in FIGS. 3 and 4 is disclosed. That is, the image forming apparatus main body is provided with a torsion hole 181 having a triangular cross section and provided with a first shaft 180 which is driven to rotate, and fixed to one end of the photosensitive drum 11 of the process cartridge 100 detachable from the outside. A torsion protrusion 21p having a shape to be engaged with the torsion hole 181 is formed in the driving assembly 20, and when the first shaft 180 of the main body of the image forming apparatus is driven to rotate, the driving unit 20 is fixed to one end of the photosensitive drum. A configuration is disclosed in which the photosensitive drum 11 is rotationally driven while the torsion protrusion 21p of the assembly is engaged with and inserted into the torsion hole 181.

However, in the configuration in which the torsion hole 181 and the torsion protrusion 21p are engaged as described above, the torsion protrusion 21p is pulled in accordance with the rotation of the first axis 180 so that the photosensitive drum 11 is the first axis 180. Although the effect of preventing the deviation from the () can be obtained, if the inclination of the torsional inclined surface forming the inner surface of the torsion hole 181 and the torsional inclined surface forming the outer surface of the torsion protrusion 21p does not coincide completely, the torsion of the triangular cross section Since the photosensitive drum is rotated and driven in a point contact state of each of the holes 181 and three vertices, each of the photosensitive drums may be rotated to generate fine fluctuations. The torsion protrusions 21p and the torsion holes 181 may be used. As the contact surface of is not always kept constant, the rotational driving force is not always transmitted uniformly, which causes a problem of uneven printing.

In addition, the torsion protrusion 21p as described above may be applied only to the torsion hole 181 having the same torsion slope, and the torsion hole 181 of various types may have the same torsion protrusion that is the same as the torsion slope of the torsion hole. There was also a problem that the torsion slope can be applied to other torsion holes only after fabrication.

The present invention, in order to solve the above-mentioned problems, the rotation driving force transmission structure of the image forming apparatus capable of reliably transmitting the rotational driving force to the photosensitive drum side while minimizing the loss of the driving force transmitted from the image forming apparatus and the process using the same It is an object to provide a cartridge.

Above all, another object of the present invention is to ensure a constant transmission of a uniform rotational driving force at all times, even if there is a difference in the torsional inclined plane of the triangular torsional hole of the main body of the image forming apparatus. .

Another object of the present invention is to provide a rotational drive force transmission structure of a general-purpose image forming apparatus capable of constantly transmitting rotational drive force from a torsion hole having various torsion inclined surfaces by using a drive assembly provided with one torsion protrusion, and the same. It is to provide a used process cartridge.

In order to achieve the above object, the present invention includes a first shaft having a triangular torsion hole formed at a center of rotation of a shape in which a triangular torsion hole is rotated by a drive motor and the depth of a triangle is increased as the depth increases, thereby providing toner. In a state where the stored process cartridge is mounted on the main body of the image forming apparatus, at least a portion of the insertion pillar of the driving assembly coupled to one end of the photosensitive drum in the process cartridge is inserted into the triangular torsion hole, and the rotation of the first shaft is performed. In the rotation driving force transmission structure of the image forming apparatus, the photosensitive drum rotates while the insertion column is rotated in accordance with the drive; Three first locking projections protruding radially are formed at a rotation angle position corresponding to the vertex of the triangle, and a base of the triangular torsion hole is formed at the base of the insertion pillar spaced from the first locking projection. The second locking projection is formed to radially protrude so as to have a rotational deviation by the twist angle of the cross section, when the first shaft starts to rotate, the first locking projection is in contact with the triangular torsion hole and the rotation driving force is transmitted, and the rotation of the first shaft is performed. The rotation of the image forming apparatus as the first locking projection reaches the deep position of the torsion coupling hole while the second locking protrusion contacts the torsion surface of the inlet side of the triangular torsion hole while the rotation is performed. It provides a driving force transmission structure.

In this way, a process cartridge containing toner is mounted in the image forming apparatus main body, and when the first axis starts to rotate while a part of the insertion pillar is inserted into the torsion triangle hole of the first axis of the image forming apparatus main body, the insertion process is performed. Three first locking projections located at the tip of the column rotate in contact with the torsional surface of the torsional triangular hole, and the first locking projection is pulled into the torsional triangular hole, and thus the torsional surfaces of the first locking projection and the torsional triangular hole are The contact position moves deep into the hole. When the first locking projection is inserted deep into the torsion triangle hole by a predetermined depth, the second locking projection having a rotational deviation by the torsion angle of the torsion triangle hole with respect to the first locking protrusion is inserted into the torsion triangle hole and the inlet side of the torsion triangle hole Contact to the torsion surface.

Therefore, in a state in which the photosensitive drum of the process cartridge mounted on the image forming apparatus main body normally prints on the recording paper, the state where the first triangular projection and the second projection are all in contact with each of the first triangular projections on the torsion triangular hole of the first axis of the image forming apparatus main body. do. That is, each of the vertices of the torsion triangular hole is rotated and driven in contact with the first locking projection at the deep position and in contact with the second locking projection at the inlet side, so that the two points are spaced apart in the depth direction near each vertex. The photosensitive drum is rotationally driven in a state where the first shaft and the drive assembly are in stable contact with each other at the contact position. To this end, the distance between the first catching protrusion and the second catching protrusion is formed to be shorter than the depth of the triangular twisting hole.

As a result, as the photosensitive drum is rotated while the torsion surface of the conventional triangular torsion hole and the torsion surface of the triangular torsion protrusion are in contact with each other only at one point, minute fluctuations or rotational driving force are always generated while the photosensitive drum rotates. It is possible to obtain an advantageous effect that can solve the problem that the printing state is uneven because it is not delivered uniformly.

In addition, the rotational driving force transmission structure of the image forming apparatus configured as described above is configured to transmit the rotational driving force in the point contact state by two points in the deep position near each vertex of the torsional triangular hole and the inlet side, respectively, the triangular torsion hole When the projection length and rotational deviation of the first locking projection and the second locking projection are determined so that the carriers, such as the locking projection and the locking projection can contact each other, the various triangular angles may be changed even if the inclination of the torsional surface between the two points in contact with each other varies. All can be applied for torsion holes. That is, the vertices of the triangular cross section of the triangular torsion hole may be applied to the one formed along the spiral trajectory or the one formed along the linear trajectory. Therefore, the advantage that it can utilize more universally compared with the conventional torsion protrusion, and can always reliably transmit a constant rotation drive force is also acquired.

The term 'triangular torsional hole' described in the present specification and claims generally refers to all of the holes having a triangular cross section rotating in a depth direction while maintaining a triangular cross-sectional shape perpendicular to the hole. Therefore, depending on the displacement per unit depth of the triangular cross section, the vertices of the triangular cross section of the triangular torsion hole may form a curved trajectory 181c such as a spiral, or may form a straight trajectory 281c. .

On the other hand, the first locking projection and the second locking projection may be formed in any shape as long as it can be inserted into the triangular torsion hole. In this regard, when the first catching protrusion and the second catching protrusion are formed in a spherical shape, the stress acting on the first catching protrusion and the second catching protrusion can be effectively dispersed, and thus, a long durability life can be secured. It is effective because it can transmit rotational driving force by engaging a triangular torsion hole regardless of the direction of rotation. The first locking protrusion and the second locking protrusion may be formed to protrude radially to the insertion pillar in a pointed shape.

In addition, the insertion pillar may be formed to be separated from the driving assembly. Through this, various types of carriers for triangular torsion holes can be easily applied in the production line according to demand, which is effective in terms of productivity of the product.

On the other hand, the present invention provides a process cartridge and a photosensitive drum assembly to which the rotational driving force transmission structure of the image forming apparatus configured as described above is applied. That is, the present invention provides a drive assembly configured as described above and a photosensitive drum assembly to which the photosensitive drum is coupled. The present invention also provides a process cartridge comprising the photosensitive drum assembly.

As described above, the present invention, the photosensitive drum as the first locking projection is pulled into the torsion triangle hole while the three first locking projections located at the tip of the insertion column rotate in contact with the torsion surface of the torsion triangle hole. The first locking projection can be prevented from being separated from the first axis of the image forming apparatus main body, and at the same time, when the first locking projection is inserted deeply into the torsion triangle hole by a predetermined depth, it rotates by the torsion angle of the torsion triangle hole relative to the first locking projection. The second locking projection with the deviation is inserted into the torsion triangular hole and contacts the inlet torsional surface of the torsion triangular hole, so that the first axis at all six contact positions, each of two points spaced in the depth direction near each vertex of the torsion triangle hole The photosensitive drum is driven to rotate in a state where the and the drive assembly are in stable contact with each other. A rotation drive force transmission structure of an image forming apparatus capable of reliably transmitting rotation drive force to the photosensitive drum side while minimizing a loss of rotation drive force transmitted from the tooth, and a process cartridge using the same.

That is, the present invention rotates the photosensitive drum in a state where the first engaging projection and the second engaging projection are in point contact at two points for each vertex at positions spaced in the depth direction in the triangular torsion hole on the main body side of the image forming apparatus, so that the image Even if there is a difference in the torsional inclination surface of the triangular torsional hole of the main body of the forming apparatus, the uniform rotational driving force is always transmitted uniformly, so that fine fluctuations occur while the photosensitive drum rotates or the rotational driving force is not always uniformly transmitted, resulting in uneven printing. Advantageous effects can be solved at once.

In addition, the present invention, when the projection length (L) and the rotation deviation (θ1) of the first locking projection and the second locking projection is determined so that the triangular torsion hole and the driving assembly can contact each other, the twist between the two points in contact with the point Rotational drive force transmission structure of a universal image forming apparatus that can be applied to a variety of triangular torsion holes, even if the inclination of the surface fluctuates to any value, so that the rotational drive force can be constantly transmitted from the torsion hole having a variety of torsional inclination surface and It provides a cartridge using the same.

1 is a schematic diagram showing the configuration of a general image forming apparatus;
Figure 2 is a perspective view showing the appearance of the cartridge mounted in Figure 1
3 and 4 are perspective views showing the rotational driving force transmission structure of the conventional image forming apparatus
5 is a perspective view showing a rotation driving force transmission structure of the image forming apparatus according to the present invention
6a to 6c are views illustrating the shape of the insertion protrusion and the locking protrusion of the driving assembly of FIG.
7A is a view showing the shape of the triangular torsion hole in the portion 'A' of FIG.
FIG. 7B is a top view of FIG. 7A
FIG. 8 illustrates another form of triangular torsion hole applicable to FIG. 5; FIG.
9 is a view showing the configuration of another type of drive assembly applicable to FIG.

Hereinafter, the rotation driving force transmission structure of the image forming apparatus according to an embodiment of the present invention with reference to the accompanying drawings in detail. However, in describing the present invention, a detailed description of known functions or configurations will be omitted for clarity.

Figure 5 is a perspective view showing a rotational driving force transmission structure of the image forming apparatus according to the present invention, Figures 6a to 6c is a view showing the shape of the insertion projection and the locking projection of the drive assembly of Figure 5, Figure 7a is a view of Figure 5 Fig. 7B is a plan view of Fig. 7A, Fig. 8 shows another form of triangular torsion hole applicable to Fig. 5, and Fig. 9 is another view applicable to Fig. 5. It is a figure which shows the structure of the drive assembly of the form.

As shown in FIG. 5, the rotation driving force transmission structure of the image forming apparatus according to the embodiment of the present invention is inserted into the triangular torsion hole 181 of the first shaft 180 rotating in the image forming apparatus main body 2. And the engaging body 121 rotates in the engaged state by the first locking protrusion 121a and the second locking protrusion 121b at the deep position P1 and the inlet side position P2 of the hole 181, respectively. It has that feature.

To this end, the drive assembly 120 mounted on one end of the photosensitive drum 110 of the process cartridge 100 and integrally rotated with the photosensitive drum 110 has a support 122 protruding to one side and a support 122. The transfer body 121 and the photosensitive drum 110 is inserted into the triangular torsion hole 181 of the first shaft 180 in contact with the torsion surface 181s of the triangular torsion hole 181 to transmit the rotational driving force to the distal end surface of the first shaft 180. And a gear 123g formed on an outer circumferential surface so as to drive rotation of a developing unit or the like in association with the rotation of the "

The triangular torsion hole 181 maintains its shape until the same triangular cross section reaches a predetermined depth d from the inlet side, as shown in Fig. 7A, but rotates in the direction indicated by reference numeral 181r as it becomes deeper. Says a hole. That is, the triangular cross section 181a (ΔY1Y2Y3) on the inlet side of the triangular torsion hole 181 of the first axis 180 rotates in the depth direction of the hole 181 to the triangular cross section 181b on the bottom side (ΔZ1Z2Z3). And triangular cross sections 181a, 181b have a torsional angle as indicated by x, as shown in FIG. 7B. At this time, the trajectory of each vertex of the triangular cross-section (181a-181b) may be located along the spiral trajectory 181c as shown in Fig. 7a, or located along the straight trajectory 281c as shown in Fig. 7c. You may. In addition, the torsion surface 181s forming the triangular torsion hole 181 may be formed in a plane by changing the size of the triangular cross section.

Here, the transmission body 121 which contacts the torsion surface 181s of the triangular torsion hole 181 and transmits the rotational driving force, protrudes the insertion column 121w protruding to a height corresponding to the depth d of the triangular torsion hole 181. ), Three first locking projections 121a disposed at rotation angle positions corresponding to the vertices of the triangles of the triangular torsion holes 181 at the distal end of the insertion column 121w, and the first locking projections 121a. The second locking protrusion 121b is formed to radially protrude from the base of the insertion column 121w to have a rotational deviation θ1 by the torsion angle of the triangular torsion holes 181 in the triangular cross sections 181a to 181b.

That is, when the triangular cross sections 181a to 181b of the triangular torsion hole 181 of the first axis 180 are equilateral triangles, the first locking protrusion 121a may be in contact with the vertex of the triangular torsion hole 181. It protrudes from the front-end | tip part of the insertion pillar 121w at the interval of 60 degree rotation angles. The second locking protrusion 121b may be spaced at a rotational angle of 60 degrees, similarly to the second locking protrusion 121a, from the base of the insertion pillar 121w spaced apart from the first locking protrusion 121a by a predetermined distance H. It protrudes radially and has the rotation deviation (theta) 1 from the 1st catching protrusion 121a as much as the torsion angle of the triangular torsion hole 181. FIG. For example, the torsion angles of the inlet side triangular cross section 181a and the bottom side triangular cross section 181b of the triangular torsion hole 181 are x, and the torsion angles of the triangular cross sections 181a to 181b as shown in Fig. 7A. In this linearly changing hole 281, the rotational deviation [theta] 1 between the first locking projection 121a and the second locking projection 121b is determined by the following expression (1).

[Equation 1]

θ1 = x * (H / d)

As the first locking protrusion 121a and the second locking protrusion 121b are arranged with rotational deviation θ1 as described above, the first locking protrusion 121a is inserted into the triangular torsion hole 181 to a certain depth. When the second locking protrusion 121b starts to be inserted into the triangular torsion hole 181, the second locking protrusion 121b is in contact with the torsion surface 181s of the triangular torsion hole 181. To this end, the first locking projection (121a) and the second locking projection (121b) is a sufficient length from the center of rotation of the drive assembly 120 to be able to smoothly contact the torsion surface (181s) of the triangular torsion hole (181) It extends to (L).

Meanwhile, the first locking protrusion 121a and the second locking protrusion 121b may be formed in any shape as long as they can be inserted into the triangular torsion holes 181 and 281. For example, as shown in FIG. 6B, the first locking protrusions 221a and the second locking protrusions 221b are formed in a spherical shape or an elliptical shape, such that the first locking protrusions 221a and the second locking protrusions are formed. Triangular torsion holes for both the case in which the photosensitive drum 110 rotates in the forward direction or the reverse direction in the process of printing on the recording material while effectively supporting the stress acting on the 221b to secure sufficient durability life. 181, 281 can be effectively engaged with the rotational driving force. In addition, as shown in Figure 6c, the first locking projections (321a) and the second locking projections (321b) are formed in the form of the end is pointed in the form of being fitted at the vertices of the triangular cross section of the triangular torsion holes (181, 281). It may be formed in a triangular shape. At this time, when the triangular torsion holes 181 and 281 are formed with the equilateral triangular end faces 181a-181b and 281a-281b, the locking projections (181s, 281s) without interfering with the bending of the torsion surfaces 181s, 281s in the depth direction ( It is preferable to have an inward angle θ2 that is about 3 to 7 degrees smaller than the vertex of the equilateral triangle so that the 321a and 321b can be in close contact with the corner of the vertex.

On the other hand, as shown in Figure 8, the insertion column 121w is formed to be detachable from the drive assembly (120, 220, 320), the male screw portion 122y and the drive force combination 120 formed on the support 122 The female threaded portion 122x of the body portion of the can be simply fastened to each other. Through this, the transfer body 121 of the appropriate shape among the insertion pillars in which the various transfer bodies 121 are formed with respect to the triangular torsion holes 181 and 281 can be simply applied in the production line according to demand, so that the productivity of the product Effective in

Hereinafter, the operation principle of the rotational driving force transmission structure of the image forming apparatus according to the embodiment of the present invention configured as described above will be described with reference to the transfer body 121 and the triangular torsion hole 181 shown in FIG.

First, a process cartridge 100 containing toner is mounted in the image forming apparatus main body 2 so that the insertion column 121w is inserted into the torsion triangular hole 181 of the first shaft 180 of the image forming apparatus main body 2. When the first shaft 180 starts to rotate while a part is inserted, the three first catching protrusions 121a protruding radially from the distal end portion of the insertion pillar 121w are the torsion surfaces of the torsion triangle hole 181 ( The first locking protrusion 121a is pulled into the torsion triangular hole 181 while rotating in contact with the 181s, and accordingly the torsion surface 181s of the first locking protrusion 121a and the torsion triangle hole 181 is rotated. ) Contact position moves toward the hole deeper.

Then, when the first locking projection 121a is inserted deeper into the inside of the triangular torsion hole 181 and the second locking protrusion 122b reaches the inlet side of the triangular torsion hole 181, the first locking protrusion ( 121a) has a rotational deviation θ1 by the torsion angle of the equilateral triangle cross section of the torsion triangle hole 181 corresponding to the interval between the second engagement protrusion 122b and radially protrudes at an interval of 60 degrees, so that the second engagement protrusion When 121b is inserted into the torsion triangle hole 181, the second locking projection 121b is in contact with the inlet side torsion surface of the torsion triangle hole 181.

Accordingly, in the state where the photosensitive drum 110 of the process cartridge 100 mounted on the image forming apparatus main body 2 normally prints on the recording paper 88, the respective deep positions near the vertices of the torsion triangle hole 181 ( At P1, two points P1 are rotated in contact with the first catching protrusion 121a and in contact with the second catching protrusion 121b at the inlet position P2 and spaced apart from each other in the depth direction near each vertex. , The photosensitive drum 110 in a state in which the first catching protrusion 121a and the second catching protrusion 121b are simultaneously in contact with each other at the six contact positions of P2) at the torsion surface 181s of the torsion triangle hole 181. It is driven to rotate. (Three points of P1 in FIG. 7A represent a point where the end of the first locking protrusion 121a is in contact with the torsion surface 181s of the triangular torsion hole 181, and the three points of P2 in FIG. 7A are the second points. The end of the locking protrusion 121b is in contact with the torsion surface 181s of the triangular torsion hole 181)

Therefore, the rotational driving force transmission structure of the image forming apparatus according to the present invention, which operates as described above, has a torsional surface of the triangular torsion hole 181 and a torsional surface of the triangular torsion protrusion 21p only at one point for each vertex. Compared with the conventional rotational driving force transmission structure which rotates and drives the photosensitive drum in the contacted state, the first photosensitive drum 121a can be rotated and driven without rotation of the photosensitive drum 110 at the same time while the photosensitive drum 110 is rotationally driven. And since the second locking protrusion 121b forms a constant contact surface with the torsion surface 181s of the triangular torsion hole 181, it is possible to transmit the rotational driving force uniformly at all times, so that the printing paper 88 can always be printed clearly. Can be obtained.

Moreover, the rotational driving force transmission structure of the image forming apparatus according to the present invention has a deep position (P1) and an entrance side position (P2) near each vertex of the torsion triangle hole 181 (Y1-Z1, Y2-Z2, Y3-Z3). Since the rotational driving force is surely transmitted only in the point contact state of two points at each of the two points, each of the first locking protrusion 121a and the second locking protrusion 121b may allow the triangular torsion hole 181 and the carrier body 121 to contact each other. When the length L and the rotation deviation θ1 are determined, a stable contact state can be realized for all the triangular torsion holes having various torsion inclination surfaces regardless of the inclination of the torsion surface 181s of the triangular torsion hole 181. .

In the above described a preferred embodiment of the present invention by way of example, the scope of the present invention is not limited only to this specific embodiment, it can be changed appropriately within the scope described in the utility model registration claims.

2: image forming apparatus main body 100: process cartridge
110: photosensitive drum 120: drive assembly
121: carrier 121w: insertion column
121a, 221a, 321a: first jamming protrusion 121b, 221b, 321b: second jamming protrusion
180: 1st axis 181, 281: triangular torsion hole
181a, 181b: Triangle section 181c, 281c: Triangle section vertex trajectory
181s and 281s: torsion plane θ1: rotation angle deviation

Claims (10)

The image forming apparatus includes a first shaft having a first axis having a triangular torsion hole formed at a center of rotation in a shape in which a triangular torsion is rotated as the depth is deeper and driven by a drive motor, and the process cartridge storing toner is formed in the image forming apparatus. In a state where it is mounted on the main body, at least part of an insertion column of the drive assembly coupled to one end of the photosensitive drum in the process cartridge is inserted into the triangular torsion hole, and the insertion column rotates according to the rotational drive of the first axis. In the rotation driving force transmission structure of the image forming apparatus in which the photosensitive drum is rotated,
Three first locking projections protruding radially are formed at a rotation angle position corresponding to the vertex of the triangle, and a base of the triangular torsion hole is formed at the base of the insertion pillar spaced from the first locking projection. The second locking projection is formed to radially protrude so as to have a rotational deviation by the twist angle of the cross section, when the first shaft starts to rotate, the first locking projection is in contact with the triangular torsion hole and the rotation driving force is transmitted, and the rotation of the first shaft is performed. While the first locking projection reaches a deep position of the triangular torsion hole while the second locking protrusion is configured to transmit a rotational driving force while contacting the torsion surface of the inlet side of the triangular torsion hole, the first locking protrusion and the The spacing between the second locking projections is shorter than the depth of the triangular torsion hole. The insertion pillars rotational driving force transfer structure of the image forming apparatus, characterized in that formed to be separable from the drive coupler.
The method of claim 1,
And the first catching protrusion and the second catching protrusion are spherically formed to protrude from the insertion pillar.
The method of claim 1,
And the first catching protrusion and the second catching protrusion protrude to the insertion column in a pointed triangular shape.
The method of claim 3,
The triangular inward angle θ2 of the first locking protrusion and the second locking protrusion is formed to be 3 to 7 degrees smaller than the vertex angle of the triangular torsion hole.
The method of claim 1,
The vertex of the triangular cross section of the triangular torsion hole is a rotational drive force transmission structure of the image forming apparatus, characterized in that located along the spiral trajectory.
The method of claim 1,
The vertex of the triangular cross section of the triangular torsion hole is a rotational drive force transmission structure of the image forming apparatus, characterized in that located along a straight trajectory.
A process cartridge comprising the drive assembly of the rotational driving force transmission structure of the image forming apparatus according to any one of claims 1 to 6, and the photosensitive drum.
A photosensitive drum assembly in which the drive assembly and the photosensitive drum of the rotation driving force transmission structure of the image forming apparatus according to any one of claims 1 to 6 are coupled.
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