JPH08194348A - Gear train mechanism - Google Patents

Abstract

PURPOSE: To immediately replace a gear with a new one when the gear is abraded or broken without specially preparing a spare gear. CONSTITUTION: Either gear 28 out of the 1st and the 2nd gears 28 and 31 meshed with each other is concentrically and integrally provided with a spare tooth part 28b having the same number of teeth and the same module as its original tooth part 28a separately from the tooth part 28a, and the 1st gear 28 is reversed and attached to a supporting shaft 29 so that the spare tooth part 28b can be meshed with the 2nd gear 31 instead of the original tooth part 28a. When the 1st gear 28 is abraded or broken, the 1st gear 28 is detached from the supporting shaft 29, reversed and attached to mesh the spare tooth part 28b with the 2nd gear 31 instead of the original tooth part 28a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention can be applied to, for example, electric / electronic devices such as a copying machine, a printer, a facsimile, a printing machine, or a complex machine thereof. More specifically, the present invention relates to a gear train mechanism that is used in such electric / electronic devices and that transmits rotation from a drive motor to each part.

[0002]

2. Description of the Related Art Conventionally, in a normal gear train mechanism, for example, as shown in FIGS.
, The second gear 2 is meshed with the third gear 3, and the rotation of the first gear 1 is transmitted to the third gear 3.

When the first gear 1, the second gear 2, or the third gear 3 is worn or damaged, the worn or damaged gear is removed from the support shaft 4 to replace it with a new one. I was exchanging.

[0004]

Therefore, in the conventional gear train mechanism, there is the trouble of having to prepare a spare gear. When a spare gear is not prepared, a new gear is required. There was a problem that we could not use electrical and electronic equipment until it arrived.

Therefore, an object of the present invention is to make it possible to immediately replace a new gear with a new one when the gear is worn or damaged without separately preparing a spare gear.

[0006]

Therefore, a gear train mechanism according to a first aspect of the present invention has, as shown in the embodiments of FIGS. 1 to 8, one or both of two meshing gears 28 and 31 with original teeth. Separately from the portions 28a and 31a, spare tooth portions 28b and 31b of the same module with the same number of teeth are provided concentrically and integrally, and the gears 28 and 31 are reversed to replace the original tooth portions 28a and 31a. Spare tooth 28
It is characterized in that the b and 31b are attached to the support shafts 29 and 32 so as to be capable of meshing with the gears 31 and 28 of the counterpart.

According to the second aspect of the present invention, FIG. 9 and FIG.
As shown in the embodiment of No. 0, in the gear train mechanism according to claim 1, when one gear 31 of the two gears 28 and 31 meshing with each other is inverted and attached, the spare tooth portion 31 thereof.
It is characterized in that the spare tooth portion 31b is formed on the one gear 31 at a position where b is meshed with the spare tooth portion 28b of the mating gear 28.

In the gear train mechanism according to a third aspect of the present invention, as shown in the embodiments of FIGS. 11 and 12, the two gears 28 and 31 that mesh with each other are separated from the original gears 28a and 31a, respectively. The auxiliary teeth 28b and 31b of the same module having the same number of teeth as the teeth 31a and 28a of 31 and 28 are provided concentrically and integrally, and those gears 28 and 31 are exchanged and inverted together to replace them. Tooth part 31b
28b are attached to the support shaft 29 so that they can mesh with each other.

[0009]

According to the first aspect, the gear 28
When 31 is worn or damaged, remove the worn or damaged gears 28, 31 from the support shaft 29,
Inverted and attached, the spare tooth portions 28b and 31b are engaged with the mating gears 31 and 28 in place of the original tooth portions 28a and 31a.

According to the second aspect of the present invention, the spare tooth portion 31b meshes with the spare tooth portion 28b of the mating gear 28 when it is inverted and attached.

According to the third aspect, the gears 28, 3
When the gear 1 is worn or damaged, the two gears 28 and 31 that mesh with each other are removed from the support shafts 29, replaced, and inverted and attached together.
1b ・ 28b Engage each other.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a schematic configuration diagram of the entire internal mechanism shown in a front view of a laser printer including a gear train mechanism according to an embodiment of the present invention.

Reference numeral 10 in the drawing denotes a printer main body. Inside the printer body 10, a drum-shaped photosensitive member 11 is provided at the substantially center. Around the photoconductor 11, a charging device 12, a developing device 13, a transfer / separation device 14, and a cleaning device 15 are arranged in a driving direction indicated by an arrow A in the figure.
To place. An optical writing device 16 is arranged above the charging device 12. Then, on the right side of the printer body 10 in the drawing, a paper feed cassette 17 accommodating the paper S is detachably provided.

When recording on the paper S, the paper feed roller 18 is rotationally driven to feed the paper S from the paper feed cassette 17 in the direction of the arrow B in the figure, and the paper S is timed. The registration roller pair 19 conveys it to the lower side of the photoconductor 11.

The photoconductor 11 is rotationally driven in the clockwise direction shown by the arrow, and at that time, the surface is uniformly charged by the charging device 12, and thereafter, the laser beam L from the optical writing device 16 is irradiated to expose the photoconductor. An electrostatic latent image is formed on the body 11. This latent image is visualized by toner when passing through the position of the developing device 13. Then, this visible image is transferred by the transfer / separation device 14 onto the upper surface of the sheet S conveyed to the lower side of the photoconductor 11.

After the image transfer, the sheet S is separated from the photoconductor 11 and conveyed to the fixing device 20, where the fixing device 2
The transferred image is fixed between the 0 rollers. After the fixing, the sheet S discharged from the fixing device 20 is conveyed, discharged by the pair of discharge rollers 21, and stacked on the discharge tray 22.

On the other hand, after the image transfer, the photoconductor 11 is cleaned by removing the residual toner on the surface by the cleaning device 15 and discharged by the charge removal lamp 23 to prepare for the next use.

Although not shown, the laser printer of the illustrated embodiment is provided with one drive motor, and the rotation of the drive motor is transferred to the photoconductor 11 through the gear train mechanism.
Various rollers and agitator of the developing device 13, the paper feed roller 1
8, the registration roller pair 19, the roller of the fixing device 20, the discharge roller pair 21, and the like.

In the gear train mechanism, the structure according to the present invention as shown in FIG. 1 is used. Reference numeral 28 in the figure
Is the first gear. The first gear 28 is provided with an original tooth portion 28a on one side, and a spare tooth portion 28b of the same module with the same number of teeth as the original tooth portion 28a is provided with the original tooth portion 2a.
8a is not separated and is continuously and concentrically provided on the other side.
Then, the E-ring 3 is rotatably attached to the support shaft 29.
0 is used to prevent slipping out.

A second gear 31 is provided in mesh with the original tooth portion 28a of the first gear 28. Second gear 31
Like the first gear 28, is rotatably attached to the support shaft 32 and is prevented from coming off by the E ring 33.

Thus, when the rotation of the drive motor is transmitted to each part via the gear train mechanism, the rotation of the first gear 28 is transmitted to the second gear 31.

After that, the original tooth portion 28 of the first gear 28 is
When a is worn or damaged, the first gear 2
8 is removed from the support shaft 29, inverted and reattached,
As shown in FIG. 2, a spare tooth portion 28b is meshed with the second gear 31 instead of the original tooth portion 28a. And the first
The rotation of the gear 28 is transmitted to the second gear 31.

In the illustrated embodiment described above, the first gear 28 on the drive side has the original tooth portion 28a and the auxiliary tooth portion 28.
b is concentrically provided. However, as shown in FIG. 4, the original tooth portion 31a and the auxiliary tooth portion 31b may be concentrically provided integrally with the second gear 31 on the driven side.

The first gear 28 and the second gear 31 are composed of the original tooth portions 28a and 31a and the auxiliary tooth portion 2 respectively.
8b and 31b were continuously provided without separation. But,
The first gear 28, as shown in FIG.
Alternatively, the a and the spare tooth portion 28b may be provided at both ends of the boss portion 28c with a space therebetween so as to be concentrically integrated. Similarly, as shown in FIG. 6, the second gear 31 may be concentrically integrated by providing the original tooth portion 31a and the auxiliary tooth portion 31b at both ends of the boss portion 31c with a space therebetween.

Further, in the illustrated embodiment described above, one of the first gear 28 and the second gear 31 is provided with the original tooth portion 2
8a and 31a and spare tooth portions 28b and 31b are provided concentrically and integrally. However, as shown in FIGS. 7 and 8, both the first gear 28 and the second gear 31 are provided with the original tooth portions 28a, 31a and the auxiliary tooth portions 28b, 31b concentrically and integrally, respectively. These gears are reversed to replace the original tooth portions 28a and 31a, and their spare tooth portions 28b and 31b are replaced.
May be attached to the support shaft 29 so as to be able to mesh with the mating gears 31 and 28. In this case, the first
It is possible to deal with a case where both the gear 28 and the second gear 31 are worn or damaged.

Next, the gear train mechanism of the present invention can be more specifically configured as shown in FIG. The first gear 28 is provided with an original tooth portion 28a on one side, and has the same number of teeth as the original tooth portion 28a and a spare tooth portion 2 of the same module.
8b is continuously and concentrically provided on the other side without separating from the original tooth portion 28a.

The original tooth portion 28a of the first gear 28 is provided so as to mesh with the original tooth portion 31a of the second gear 31. The original tooth portion 31a is provided at one end of the boss portion 31c. On the other end side of the boss portion 31c, the original tooth portion 31a is formed.
Spare tooth portions 31b are provided concentrically and integrally with each other.
The spare tooth portion 31b is the other end portion 31d of the boss portion 31c.
It is located on the inner side of, and is formed by the same module with the same number of teeth as the original tooth portion 31a.

The original tooth portion 31a of the second gear 31 is provided so as to mesh with the original tooth portion 35a of the third gear 35. The third gear 35 is provided with an original tooth part 35a on one side, and a spare tooth part 35b of the same module with the same number of teeth as the original tooth part 35a is continuous without being separated from the original tooth part 35a. It is installed concentrically on the other side.

When the rotation of the drive motor is transmitted to each part via the gear train mechanism, the first gear 2 is first used.
The rotation of 8 is transmitted to the third gear 35 via the original tooth portion 31a of the second gear 31.

After that, for example, when the original tooth portion 31a of the second gear 31 is worn or damaged, the second gear 31
The gear 31 is removed from the support shaft, inverted, and attached again to the support shaft. Then, as shown in FIG. 10, the spare tooth portion 31 b is replaced by the spare tooth portion 28 b of the first gear 28.
And the other tooth portion 35b of the other third gear 35, and the other end portion 31d of the boss 31c is the original tooth portion 28a of the first gear 28 and the original tooth portion of the third gear 35. It is located between 35a.

Therefore, when the rotation of the drive motor is transmitted to each part via the gear train mechanism, the rotation of the first gear 28 is transferred to the third gear 35 via the auxiliary tooth portion 31b of the second gear 31. Communicate to.

Next, the gear train mechanism of the present invention can be more specifically configured as shown in FIGS. 11 and 12. In addition to the original tooth portion 28a, the first gear 28 is concentrically provided with a spare tooth portion 28b having the same number of teeth and the same module as the original tooth portion 31a of the second gear 31. on the other hand,
The second gear 31 includes, in addition to the original tooth portion 31a, a spare tooth portion 31b having the same number of teeth and the same module as the original tooth portion 28a of the first gear 28, concentrically and integrally. At first, as shown in the figure, the original tooth portion 28 of the first gear 28 is
a is provided so as to mesh with the original tooth portion 31a of the second gear 31.

In the radial direction, the first gear 28 or the second gear 31
When the first gear 28 and the second gear 31 mesh with each other, the meshing first gear 28 and the second gear 31 are respectively removed from the support shafts 29 and 32, replaced, and inverted and attached together. The spare tooth portions 28b and 31b of the gear 31 are meshed with each other.

Thus, when the rotation of the drive motor is transmitted to each part via the gear train mechanism, the rotation of the first gear 28 is transmitted to the second gear 31.

[0035]

As described above, according to the first aspect, when the gear is worn or damaged, the worn or damaged gear is removed from the support shaft, inverted, and attached. Since the spare tooth portion is engaged with the mating gear in place of the original tooth portion, it is possible to eliminate the trouble of separately preparing a spare gear portion. Further, the worn or damaged gear can be immediately replaced, and the inconvenience that the electric / electronic device cannot be used until a new gear arrives as in the conventional case can be eliminated.

According to the second aspect of the present invention, since the spare tooth portion meshes with the spare tooth portion of the mating gear when it is installed upside down, it can be replaced with a new mesh at the same time.

According to the third aspect of the present invention, when the gears are worn or damaged, the two meshing gears are detached from the support shafts, replaced, and inverted together.
Since the spare tooth portions are meshed with each other, it is possible to eliminate the trouble of separately preparing a spare gear. Further, the worn or damaged gear can be immediately replaced, and the inconvenience that the electric / electronic device cannot be used until a new gear arrives as in the conventional case can be eliminated.

[Brief description of drawings]

FIG. 1 is a plan view of a gear train mechanism that is an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which the first gear is inverted and attached.

FIG. 3 is a schematic configuration diagram of an entire internal mechanism of a laser printer including the gear train mechanism.

FIG. 4 is a plan view of another example of the gear train mechanism.

FIG. 5 is a plan view of a gear train mechanism showing still another example.

FIG. 6 is a plan view of a gear train mechanism showing still another example.

FIG. 7 is a plan view of a gear train mechanism showing still another example.

FIG. 8 is a plan view of a gear train mechanism showing still another example.

FIG. 9 is a plan view of a gear train mechanism that is another embodiment of the present invention.

FIG. 10 is a plan view showing a state in which the second gear is reversed and attached.

FIG. 11 is a plan view of a gear train mechanism that is still another embodiment of the present invention.

FIG. 12 is a front view thereof.

FIG. 13 is a plan view of a conventional gear train mechanism.

FIG. 14 is a front view thereof.

[Explanation of symbols]

 28 1st gear (gear) 28a Original tooth part 28b Spare tooth part 29 Support shaft 31 Second gear (gear) 31a Original tooth part 31b Spare tooth part

Claims (3)

[Claims] 1. One or both of two meshing gears are provided with a spare tooth portion of the same module having the same number of teeth as that of the original tooth portion concentrically and integrally, and the gears are reversed to form the original tooth portion. A gear train mechanism in which spare teeth, instead of teeth, are attached to a support shaft so as to be able to mesh with a counterpart gear. 2. The spare tooth portion is provided on the one gear at a position where the spare tooth portion meshes with the spare tooth portion of the mating gear when one of the meshing gears is reversed and attached. The gear train mechanism according to claim 1, which is formed. 3. In addition to the original tooth portion, a spare tooth portion of the same module having the same number of teeth as the tooth portion of the other gear is provided concentrically and integrally on both of the two meshing gears, and the gears are replaced. Then, the gear train mechanism is formed by reversing them together and attaching them to the support shaft so that their spare tooth portions can mesh with each other.