JPH06249321A - Driving force transmission member - Google Patents

Abstract

PURPOSE:To prevent generation of irregular rotation and blurring of a rotational body without using a fly wheel by integrating a ring on whose outer periphery a belt guide groove or a gear is formed with a journal part through an oscillation eliminating elastic body fitted to an inner side of the ring. CONSTITUTION:A driven pulley 3 is prepared by integrating a ring 5 on whose outer periphery a toothed belt guide groove 4 is formed with a journal part 7 which is fitted and connected to an oscillation eliminating elastic body 6 made of synthetic rubber, which is fitted and connected to an inner side of the ring 5. The journal part 7 is fixed to one side of a center shaft 8 which is fixed to a photosensitive drum 2. Both ends of the center shaft 8 are supported by bearings arranged on a frame of a copy machine. In respect to a belt 9, one end is wound around the belt guide groove 4 of the driven pulley 3, and the other end is wound around a belt guide groove 11 of a driving pulley 10. The driving pulley 10 is interlocked with a motor 13 through a winding transmission system 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmitting member for driving a photosensitive drum of an image forming apparatus, a platen roller of an ink jet printer, or the like.

[0002]

2. Description of the Related Art In an image forming apparatus such as an electrostatic copying machine, a photosensitive drum is rotatably driven via a transmission member such as a timing belt or a chain, while a spindle of the photosensitive drum has a flywheel. Is attached to prevent uneven rotation and blurring. This is because if rotation irregularity or blurring occurs on the photosensitive drum, the image quality will deteriorate.

[0003]

However, since the flywheel described above is quite heavy, the spindle of the photoconductor drum to which it is attached has its shaft diameter set to a large value so as not to cause bending, and its bearing portion. It was necessary to provide sufficient reinforcement to Moreover, since the flywheel is quite large in diameter, it requires a space for installation, which reduces the degree of freedom in the layout of the surroundings.

The present invention has been made in view of such circumstances.
An object of the present invention is to provide a driving force transmission member that can prevent rotation unevenness and blurring of a rotating body without using a flywheel.

[0005]

The present invention has means for solving the above-mentioned problems as follows. That is, the first aspect of the invention is characterized in that the ring body having the belt guide groove or the gear formed on the outer periphery is integrated with the shaft support through the vibration absorbing elastic body fitted inside the ring body. .

In the second invention, the shaft support portion of the first invention is
It is characterized in that it is attached to a spindle of a photosensitive drum of an image forming apparatus.

In the third invention, the shaft support portion of the first invention is
It is characterized in that it is attached to a support shaft of a platen roller of an inkjet printer.

[0008]

The vibration frequency component transmitted to the ring body having the belt guide groove or the gear formed on the outer periphery is absorbed by the vibration absorbing elastic body, so that the vibration propagation from the drive system to the shaft support can be suppressed. . On the contrary, it is possible to absorb the vibration from the shaft support portion to the ring body.

Therefore, by attaching the photoconductor drum and the platen roller to the shaft support, it is possible to suppress the occurrence of rotational unevenness and shake.

[0010]

Embodiments of the driving force transmission member of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example in which a driving force transmission member of the present invention is adopted as a driven pulley 3 attached to a photosensitive drum 2 of an electrostatic copying machine (image forming apparatus) 1 (see FIG. 2). Is integrally formed with a shaft support 7 in which a ring body 5 having a toothed belt guide groove 4 formed on its outer periphery is fitted and bonded to a vibration absorbing elastic body 6 made of, for example, synthetic rubber and fitted and bonded to the inside thereof. The shaft support 7 is fitted and fixed to one side of the support shaft 8 fixed to the photosensitive drum 2, and both ends of the support shaft 8 are bearings (not shown) provided on the frame of the copying machine body. ) Is supported.

The belt 9 having one end wound around the belt guide groove 4 of the driven pulley 3 described above has the drive pulley 10 at the other end.
2 is wound around the belt guide groove 11, and its drive pulley 10 is transmission-coupled to a motor 13 via a winding transmission system 12 as shown in FIG. The drive pulley 10 may be attached to the output shaft of the motor 13.

As described above, since the driven pulley 3 of the photosensitive drum 2 is constructed by using the vibration absorbing elastic body 6, the vibration frequency component is transmitted to the ring body 5 through the winding transmission system 12. In this case, the vibration absorbing elastic body 6 absorbs the vibration frequency component of the shaft supporting portion 7
And the transmission of vibration and shake to the support shaft 8 is suppressed,
The photosensitive drum 2 can be rotated evenly. This makes it possible to always obtain a stable and high-quality image.

By selecting an appropriate material, the synthetic rubber can exert a so-called cushioning function capable of absorbing a wide range of vibration frequency components and absorbing vibrations and shocks.
In this example, in particular, the rotation speed and inertia of the photosensitive drum 2 are taken into consideration, and the optimum elastic coefficient is set so that the photosensitive drum 2 can be rotated evenly without using a flywheel. ing.

Therefore, as described above, not only can the image quality be constantly improved, but also the electrostatic copying machine 1
The degree of freedom in the design of the inside of the car is improved, and it is possible to realize weight and size reduction, and also to reduce the cost. In FIG. 2, reference numeral 15 is a document table cover, 16 is a manual feed section, 17 is a start button, 18 is a numeric keypad, and 19 is a paper size display section.

3 to 5 show different examples of the driving force transmitting member. In FIG. 3, the ring body 5 having the belt guide groove 4 on the outer periphery is provided with the recesses 5a on the inner periphery and the protrusion 21 on the outer periphery. The inner ring 22 having ... Is fitted inside the ring body 5. Thereby, for example, the ring body 5 can be made of metal and the inner ring 22 can be formed of a synthetic resin material having good adhesion to the vibration absorbing elastic body 6.

Further, in FIG. 4, by further forming protrusions 23 on the inner circumference of the inner ring 22 and also forming protrusions 24 on the outer circumference of the shaft support portion 7, a stronger integration can be achieved. I am trying to make it.

FIG. 5 shows the case where the gears 25 are formed on the outer periphery of the ring body 5, and it goes without saying that a good vibration absorbing action can be exhibited even in the gear transmission mechanism.

FIG. 6 shows a case where the driven pulley 3 which is the driving force transmitting member of the present invention is attached to the spindle 33 of the platen roller 32 of the line head type ink jet printer 31 in which the sheet is conveyed at a high speed. The belt wound around the driven pulley 3 is power-coupled to the motor 35 through the winding transmission system 34, and even if the vibration frequency component is transmitted from the winding transmission system 34 to the driven pulley 3. ,
The cushioning action of the vibration absorbing elastic body 6 (see FIG. 1) suppresses the occurrence of rotational unevenness or blurring of the platen roller 32, and a stable and high-quality image can be obtained at all times. In FIG. 6, reference numeral 36 is a paper supply unit and 37 is a print head. Further, the driven pulley 3 and the motor 35 may be connected by a belt.

The driving force transmitting member as described above is widely applied not only to the electrostatic copying machine 1 and the ink jet printer 31 but also to a driving mechanism such as a driving system of other office equipment which requires a uniform rotation. It goes without saying that you can do it. The material of the ring body 5, the shaft support 7, and the inner ring 22 may be selected from synthetic resin and metal.

[0020]

As described above, the driving force transmitting member of the present invention has a ring body having a belt guide groove or a gear formed on the outer periphery thereof and a vibration absorbing elastic body fitted inside the ring body. Since it is integrated with the shaft support, the vibration transmitted to the ring body is suppressed from propagating to the shaft support. In addition, the propagation of vibration from the shaft support to the ring body is also suppressed.
Therefore, by attaching the shaft support to the support shaft of the photoconductor drum or the support shaft of the platen roller of the inkjet printer, the photoconductor drum and the platen roller can be evenly rotated without using a flywheel,
High-quality images can always be obtained, the degree of freedom in design is improved, and weight, size, and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example in which a driving force transmission member of the present invention is attached to a photosensitive drum.

FIG. 2 is a partially transparent perspective view of the electrostatic copying machine.

FIG. 3 is a cross-sectional view showing another embodiment of the driving force transmission member.

FIG. 4 is a sectional view showing another embodiment of the driving force transmission member.

FIG. 5 is a sectional view showing still another embodiment of the driving force transmission member.

FIG. 6 is a perspective view showing an example in which the driving force transmission member is attached to a spindle of a platen roller of an inkjet printer.

[Explanation of symbols]

2 ... Photosensitive drum, 3 ... Driving force transmitting member, 4 ... Belt guide groove, 5 ... Ring body, 6 ... Vibration absorbing elastic body, 7 ... Shaft support, 8, 33 ... Spindle, 25 ... Gear, 31 ... Inkjet printer, 32 ... Platen roller.

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[Procedure amendment]

[Submission date] September 24, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Driving force transmission member

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmitting member for driving a photosensitive drum of an image forming apparatus, a platen roller of an ink jet printer, or the like.

[0002]

2. Description of the Related Art In an image forming apparatus such as an electrostatic copying machine, a photosensitive drum is rotatably driven via a transmission member such as a timing belt or a chain, while a spindle of the photosensitive drum has a flywheel. Is attached to prevent uneven rotation and blurring. This is because if rotation irregularity or blurring occurs on the photosensitive drum, the image quality will deteriorate.

[0003]

However, since the flywheel described above is quite heavy, the spindle of the photoconductor drum to which it is attached has its shaft diameter set to a large value so as not to cause bending, and its bearing portion. It was necessary to provide sufficient reinforcement to Moreover, since the flywheel is quite large in diameter, it requires a space for installation, which reduces the degree of freedom in the layout of the surroundings.

The present invention has been made in view of such circumstances.
An object of the present invention is to provide a driving force transmission member that can prevent rotation unevenness and blurring of a rotating body without using a flywheel.

[0005]

The present invention has means for solving the above-mentioned problems as follows. That is, in the first aspect of the invention, the ring body having the belt guide portion or the gear formed on the outer periphery is integrated with the shaft support portion via the vibration absorbing elastic body fitted inside thereof. .

In the second invention, the shaft support portion of the first invention is
It is characterized in that it is attached to a spindle of a photosensitive drum of an image forming apparatus.

In the third invention, the shaft support portion of the first invention is
It is characterized in that it is attached to a support shaft of a platen roller of an inkjet printer.

[0008]

[Action] belt guide portion or the vibration frequency components transmitted to the ring body formed on the outer peripheral gear, by absorbing the vibration damping elastic member, it is possible to suppress the propagation of vibrations from the drive system to the shaft support . On the contrary, it is possible to absorb the vibration from the shaft support portion to the ring body.

Therefore, by attaching the photoconductor drum and the platen roller to the shaft support, it is possible to suppress the occurrence of rotational unevenness and shake.

[0010]

Embodiments of the driving force transmission member of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example in which the driving force transmission member of the present invention is adopted as a driven pulley 3 attached to a photosensitive drum 2 of an electrostatic copying machine (image forming apparatus) 1 (see FIG. 2). Is a ring-shaped body 5 having a toothed belt guide groove (an example of a belt guide portion) 4 formed on the outer periphery thereof, and is fitted and bonded to a vibration absorbing elastic body 6 made of, for example, synthetic rubber and fitted and bonded to the inside thereof. The shaft support 7 is integrated with the shaft support 7, and the shaft support 7 is fitted and fixed to one side of the support shaft 8 fixed to the photosensitive drum 2. Both ends of the support shaft 8 are the frame of the copying machine main body. Bearings (not shown)
Is supported by.

The belt 9 having one end wound around the belt guide groove 4 of the driven pulley 3 has the other end connected to the drive pulley 1.
0 is wound around the belt guide groove 11, and as shown in FIG.
The drive pulley 10 is drivingly connected to a motor 13 via a winding transmission system 12. The drive pulley 10
May be attached to the output shaft of the motor 13.

As described above, since the driven pulley 3 of the photosensitive drum 2 is formed by using the vibration absorbing elastic body 6, even if the vibration frequency component is transmitted to the ring body 5 via the winding transmission system 12. In this case, the vibration-absorbing elastic body 6 absorbs the vibration frequency component and suppresses the transmission of vibrations and shakes to the shaft support portion 7 and the support shaft 8, thereby rotating the photosensitive drum 2 evenly. You can This makes it possible to always obtain a stable and high-quality image.

By selecting an appropriate material, the vibration absorbing elastic body 6 can exhibit a so-called buffer function capable of absorbing a wide range of vibration frequency components and absorbing vibrations and shocks. The optimum material is selected in consideration of the number of revolutions and inertia of the photoconductor drum 2 so that the photoconductor drum 2 can be uniformly rotated without using a flywheel.

Therefore, as described above, not only can the image quality be constantly improved, but also the electrostatic copying machine 1
The degree of freedom in the design of the inside of the car is improved, and it is possible to realize weight and size reduction, and also to reduce the cost. In FIG. 2, reference numeral 15 is a document table cover, 16 is a manual feed section, 17 is a start button, 18 is a numeric keypad,
A paper size display unit 19 is provided.

3 to 5 show different examples of the driving force transmitting member. In FIG. 3, the ring body 5 having the belt guide groove 4 on the outer periphery is formed with the recesses 5a ...
The inner ring 22 having ... Is fitted inside the ring body 5. Thereby, for example, the ring body 5 may be made of metal and the inner ring 22 may be formed of a synthetic resin material having good adhesiveness to the vibration absorbing elastic body 6.

In FIG. 4, a convex portion 23 is further formed on the inner circumference of the inner ring 22, and a convex portion 2 is formed on the outer circumference of the shaft support portion 7.
By forming 4 ..., even stronger integration can be achieved.

FIG. 5 shows a case where gears 25 ... Are formed on the outer circumference of the ring body 5, and it goes without saying that a good vibration absorbing action can be exhibited even in the gear transmission mechanism.

FIG. 6 shows a case where the driven pulley 3 which is the driving force transmitting member of the present invention is attached to the support shaft 33 of the platen roller 32 of the line head type ink jet printer 31 in which the sheet is conveyed at a high speed. The belt wound around the driven pulley 3 is drivingly connected to the motor 35 through the winding transmission system 34, and even if the winding transmission system 3
Even if the vibration frequency component is transmitted to the driven pulley 3 from 4, the vibration absorbing elastic body 6 (see FIG. 1) suppresses the platen roller 32 from causing uneven rotation and blurring, and always A stable and high-quality image can be obtained. In FIG. 6, reference numeral 36 is a paper supply unit, 3
7 is a print head. Further, the driven pulley 3 and the motor 35 may be connected by a belt.

The driving force transmitting member as described above is widely applied not only to the electrostatic copying machine 1 and the ink jet printer 31 but also to a driving mechanism such as a driving system of other office equipment which requires a uniform rotation. It goes without saying that you can do it. The material of the ring body 5, the shaft support 7, and the inner ring 22 may be selected from synthetic resin and metal.

[0020]

As described above, the driving force transmitting member according to the present invention has a ring body having a belt guide portion or a gear formed on the outer periphery thereof and a vibration absorbing elastic body fitted inside the ring body. Since it is integrated with the shaft support, the vibration transmitted to the ring body is suppressed from propagating to the shaft support. In addition, the propagation of vibration from the shaft support to the ring body is also suppressed.
Therefore, by attaching the shaft support to the support shaft of the photoconductor drum or the support shaft of the platen roller of the inkjet printer, the photoconductor drum and the platen roller can be evenly rotated without using a flywheel,
High-quality images can always be obtained, the degree of freedom in design is improved, and weight, size, and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example in which a driving force transmission member of the present invention is attached to a photosensitive drum.

FIG. 2 is a partially transparent perspective view of the electrostatic copying machine.

FIG. 3 is a cross-sectional view showing another embodiment of the driving force transmission member.

FIG. 4 is a sectional view showing another embodiment of the driving force transmission member.

FIG. 5 is a sectional view showing still another embodiment of the driving force transmission member.

FIG. 6 is a perspective view showing an example in which the driving force transmission member is attached to a spindle of a platen roller of an inkjet printer.

[Explanation of Codes] 2 ... Photosensitive drum, 3 ... Driving force transmitting member, 4 ... Belt guide portion , 5 ... Ring body, 6 ... Vibration absorbing elastic body, 7 ... Shaft support portion, 8, 33 ... Spindle shaft, 25 ... gears, 31 ... inkjet printer, 32 ... platen roller.

Claims (3)

[Claims] 1. A driving force transmission characterized in that a ring body having a belt guide groove or a gear formed on the outer periphery is integrated with a shaft support through a vibration absorbing elastic body fitted inside thereof. Element. 2. The driving force transmission member according to claim 1, wherein the shaft support portion is attached to a support shaft of a photosensitive drum of the image forming apparatus. 3. The driving force transmission member according to claim 1, wherein the shaft support portion is attached to a support shaft of a platen roller of an ink jet printer.