JP2004264688A - Image carrier driving mechanism - Google Patents

Image carrier driving mechanism Download PDF

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Publication number
JP2004264688A
JP2004264688A JP2003056176A JP2003056176A JP2004264688A JP 2004264688 A JP2004264688 A JP 2004264688A JP 2003056176 A JP2003056176 A JP 2003056176A JP 2003056176 A JP2003056176 A JP 2003056176A JP 2004264688 A JP2004264688 A JP 2004264688A
Authority
JP
Japan
Prior art keywords
image carrier
driving mechanism
coupling member
carrier driving
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003056176A
Other languages
Japanese (ja)
Inventor
Yuzuru Ebara
譲 江原
Original Assignee
Ricoh Co Ltd
株式会社リコー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd, 株式会社リコー filed Critical Ricoh Co Ltd
Priority to JP2003056176A priority Critical patent/JP2004264688A/en
Publication of JP2004264688A publication Critical patent/JP2004264688A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To stably rotate an image carrier by reducing a gap between the image carrier and the protrusions of a coupling member. <P>SOLUTION: In an image carrier driving mechanism by which the driving force of an image carrier driving shaft 3 is transmitted to the image carrier 1, a groove part 1-1 communicating with a groove part 2-1 formed at a flange 2 fixed at the image carrier 1 is formed at the end of the image carrier 1, and the protrusion 11-1 fitted in the groove parts 2-1 and 1-1 of the flange 2 and the image carrier 1 are formed at the coupling member 11 at the end of the image carrier driving shaft 3. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image carrier driving mechanism in an image forming apparatus such as a copying machine, a laser printer, and a facsimile.
[0002]
[Prior art]
FIG. 10 is an exploded perspective view showing a conventional image carrier driving mechanism, and FIG. 11 is a sectional view of the image carrier shown in FIG. In FIG. 10, a joint member 4 is provided on an image carrier driving shaft 3 provided on the machine main body, and the rotational force of a driving source (not shown) is transmitted to the joint member 3. This rotational force is generated by inserting the image carrier driving shaft 3 into a hole at the center of the flange 2 which is pressed into one end of the image carrier 1 and engaging the groove of the flange 2 with the joint member 4. 1 is transmitted. The image carrier 1 is detachable from the machine main body for maintenance and replacement. FIG. 12 is a perspective view showing another example of the conventional image carrier driving shaft, in which a plurality of projections of the joint member 5 are provided.
[0003]
Further, as a similar technique, a cylindrical plate cylinder which has an ink supply means and rotates in a state where a perforated master is mounted on an outer peripheral surface thereof, and printing paper fed one by one from a paper supply means A cylindrical impression cylinder that is driven to rotate in the direction opposite to the direction of rotation of the plate cylinder while pressing the sheet against the plate cylinder after gripping and winding on the peripheral surface, A stencil printing apparatus comprising: a contact / separation unit that moves the impression cylinder toward and away from the plate cylinder in synchronization with the sheet feeding timing in order to avoid contact in a state where the sheet is absent. A stencil printing apparatus disclosed in Japanese Patent Application Laid-Open Publication No. HEI 10-146556 is known which eliminates the occurrence of an error in holding a sheet due to a change in the peripheral speed of the impression cylinder caused by the swinging of the impression cylinder.
[0004]
[Patent Document 1]
JP 10-258566 A
[Problems to be solved by the invention]
FIG. 13 is a front view of the image carrier driving mechanism according to the conventional example in the axial direction of the image carrier. In order to allow the image carrier 1 to be attached and detached, at least a gap x1 occurs between the groove of the flange 2 and the joint member 4. Therefore, on the surface of the image carrier 1, rattling of x2 larger than x1 occurs as shown in FIG.
x2 = x1 · r2 / r1
r2: radius of the image carrier 1 r1: distance between the contact point between the joint member 4 and the flange 2 and the center of the image carrier 1
When a force is applied to the surface of the image carrier 1, a moment of force × (r2−r1) is applied to the contact point between the joint member 4 and the flange 2. At this time, if a load variation is applied to the image carrier 1 due to the contact of a cleaning blade or a brush (not shown), the image carrier 1 fluctuates in speed due to rattling or insufficient strength, and the image carrier 1 There is a problem that the toner image is disturbed.
[0007]
Therefore, an object of the present invention is to stably rotate the image carrier by reducing a gap between the image carrier and the convex portion of the coupling member.
[0008]
The second object of the present invention is to reduce the force applied to the coupling member by providing a plurality of projections of the coupling member.
[0009]
A third object of the present invention is to further reduce the gap between the image carrier and the projection of the coupling member.
[0010]
A fourth object of the present invention is to positively change the resonance frequency of the image carrier by providing a seat.
[0011]
A fifth object of the present invention is to positively attenuate the resonance frequency response of the image carrier by providing an elastic body.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided an image carrier driving mechanism for transmitting a driving force of an image carrier driving shaft to an image carrier, wherein a groove formed on a flange fixed to the image carrier. An image carrier driving mechanism having a flange and a projection fitted into the groove of the image carrier is most commonly used as a coupling member at the end of the image carrier driving shaft. Characteristics.
[0013]
The invention according to a second aspect is characterized mainly by the image carrier driving mechanism according to the first aspect, wherein a plurality of projections of the coupling member are provided.
[0014]
The invention according to a third aspect is characterized mainly by the image carrier driving mechanism according to the first aspect, wherein the convex portion of the coupling member has a tapered shape.
[0015]
The invention according to a fourth aspect is characterized mainly by the image carrier driving mechanism according to the first aspect, wherein the convex portion of the coupling member has a groove.
[0016]
The invention according to a fifth aspect is characterized mainly by the image carrier driving mechanism according to the fourth aspect, in which an elastic body is embedded instead of a lip formed on the convex portion of the coupling member.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of the image carrier driving mechanism according to the first embodiment of the present invention.
FIG. 2 is a sectional view of the image carrier shown in FIG. FIG. 3 is a view showing a fitting state of the coupling member and the groove of the flange in the image carrier driving mechanism shown in FIG. FIG. 4 is a diagram showing the gap of the fitting portion and the radius of the image carrier.
[0018]
A groove 2-1 is provided on the flange 2 as in the conventional case, but a groove 1-1 is also provided on the surface of the image carrier 1 and at the end on the flange 2 side, and the image carrier drive shaft is provided. The coupling member 11 at the distal end is also configured to be sufficiently large so that the projection 11-1 is fitted into the groove 1-1 of the image carrier 1.
[0019]
In this configuration, as shown in FIGS. 3 and 4, the gap x3 between the groove 2-1 of the flange 2 and the projection 11-1 of the coupling member 11 and the backlash of the surface of the image carrier 1 are equal to each other. In comparison, the speed can be sufficiently reduced, and the speed fluctuation of the image carrier 1 can be reduced.
[0020]
Further, even when a force is applied to the surface of the image carrier 1, the force is directly applied to the coupling member 11 and the image carrier 1, so that the flange 2 does not need to have sufficient strength, and maintenance (replacement) is not required. Cost can be reduced. Further, by providing the plurality of protrusions 11-1 on the coupling member 11, the force is dispersed.
[0021]
FIG. 5 is an exploded top view of the image carrier driving mechanism according to the second embodiment of the present invention. In the present embodiment, the convex portion 11-1 of the coupling member 11 and the groove portion 1-1 of the image carrier 1 are tapered.
[0022]
FIG. 6 is an exploded top view of the image carrier driving mechanism according to the third embodiment of the present invention. In the present embodiment, a groove 11-2 having a width t is provided on the convex portion 11-1 of the coupling member 11.
[0023]
FIG. 7 is a diagram illustrating a first example of the vibration characteristics of the image carrier, and a line p indicates a case where there is no slit 11-2. By changing the width and length of the slip 11-2, the spring constant changes, and the resonance frequency can be changed like the line q or the line r.
[0024]
FIG. 8 is a diagram showing an example in which an elastic body is buried instead of the connecting member. An elastic body 12 made of rubber or the like is provided on a groove 11-2 of the coupling member 11.
[0025]
FIG. 9 is a diagram illustrating a second example of the vibration characteristics of the image carrier. A line u indicates the vibration characteristics when the elastic body 12 is not provided, and a line v indicates the vibration characteristics when the elastic body 12 is provided. It can be seen that the vibration is sufficiently attenuated by adjusting the body 12.
[0026]
【The invention's effect】
According to the first aspect, the gap between the groove of the image carrier and the convex portion of the coupling member can be reduced to stably rotate the image carrier, so that the toner image on the image carrier is not disturbed. Can be prevented.
[0027]
In the second aspect, by providing a plurality of protrusions of the coupling member, the force applied to the coupling member is reduced, so that the coupling member can be made of a less expensive material.
[0028]
According to claim 3, the effect of claim 1 can be further enhanced.
[0029]
According to the fourth aspect, when the speed fluctuation is amplified by resonance, the frequency fluctuation can be reduced by positively changing the resonance frequency of the image carrier.
[0030]
According to the fifth aspect, the response of the resonance frequency of the image carrier can be positively attenuated, and the speed fluctuation can be further reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an image carrier driving mechanism according to a first embodiment of the present invention.
FIG. 2 is a sectional view of the image carrier shown in FIG.
FIG. 3 is a view showing a fitting state between a coupling member and a groove of a flange in the image carrier driving mechanism shown in FIG. 1;
FIG. 4 is a diagram showing a gap of the fitting portion and a radius of the image carrier.
FIG. 5 is an exploded top view of an image carrier driving mechanism according to a second embodiment of the present invention.
FIG. 6 is an exploded top view of an image carrier driving mechanism according to a third embodiment of the present invention.
FIG. 7 is a diagram illustrating a first example of vibration characteristics of an image carrier.
FIG. 8 is a diagram showing an example in which an elastic body is embedded instead of the connecting member.
FIG. 9 is a diagram illustrating a second example of the vibration characteristics of the image carrier.
FIG. 10 is an exploded perspective view showing a conventional image carrier driving mechanism.
11 is a sectional view of the image carrier shown in FIG.
FIG. 12 is a perspective view showing another example of a conventional image carrier driving shaft.
FIG. 13 is a front view of an image carrier driving mechanism according to a conventional example in an image carrier axial direction.
FIG. 14 is a diagram showing a defect in an image carrier driving mechanism according to a conventional example.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 image carrier 1-1 groove 2 flange 2-1 groove 3 image carrier drive shaft 11 coupling member 11-1 convex 11-2 slot 12 elastic body

Claims (5)

  1. In an image carrier driving mechanism for transmitting a driving force of an image carrier driving shaft to an image carrier, a groove connected to a groove formed in a flange fixed to the image carrier is formed at an end of the image carrier, An image carrier driving mechanism, characterized in that the coupling member at the tip of the drive shaft has a flange and a projection fitted into the groove of the image carrier.
  2. 2. The image carrier driving mechanism according to claim 1, wherein a plurality of projections of the coupling member are provided.
  3. 2. The image carrier driving mechanism according to claim 1, wherein the convex portion of the coupling member has a tapered shape.
  4. 2. The image carrier driving mechanism according to claim 1, wherein a groove is formed on the convex portion of the connecting member.
  5. 5. The image carrier driving mechanism according to claim 4, wherein an elastic body is embedded instead of the slide formed on the projection of the connecting member.
JP2003056176A 2003-03-03 2003-03-03 Image carrier driving mechanism Pending JP2004264688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003056176A JP2004264688A (en) 2003-03-03 2003-03-03 Image carrier driving mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003056176A JP2004264688A (en) 2003-03-03 2003-03-03 Image carrier driving mechanism

Publications (1)

Publication Number Publication Date
JP2004264688A true JP2004264688A (en) 2004-09-24

Family

ID=33119974

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003056176A Pending JP2004264688A (en) 2003-03-03 2003-03-03 Image carrier driving mechanism

Country Status (1)

Country Link
JP (1) JP2004264688A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009058657A (en) * 2007-08-30 2009-03-19 Ricoh Printing Systems Ltd Drive force transmission device for rotating body and image forming apparatus with same
JP2009223247A (en) * 2008-03-19 2009-10-01 Fuji Xerox Co Ltd Image forming apparatus
US8229319B2 (en) 2009-04-28 2012-07-24 Brother Kogyo Kabushiki Kaisha Image forming apparatus including detachable supporting member
US8270877B2 (en) 2009-04-28 2012-09-18 Brother Kogyo Kabushiki Kaisha Image forming apparatus
JP2013020127A (en) * 2011-07-12 2013-01-31 Canon Inc Image forming apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009058657A (en) * 2007-08-30 2009-03-19 Ricoh Printing Systems Ltd Drive force transmission device for rotating body and image forming apparatus with same
JP2009223247A (en) * 2008-03-19 2009-10-01 Fuji Xerox Co Ltd Image forming apparatus
US8229319B2 (en) 2009-04-28 2012-07-24 Brother Kogyo Kabushiki Kaisha Image forming apparatus including detachable supporting member
US8270877B2 (en) 2009-04-28 2012-09-18 Brother Kogyo Kabushiki Kaisha Image forming apparatus
JP2013020127A (en) * 2011-07-12 2013-01-31 Canon Inc Image forming apparatus
US9063449B2 (en) 2011-07-12 2015-06-23 Canon Kabushiki Kaisha Electrophotographic image forming apparatus

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