JP2502300Y2 - Clutch mechanism of automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a clutch mechanism of an automatic paper feeder capable of switching between paper feeding and paper ejection.

[Conventional technology]

2. Description of the Related Art Conventionally, in an automatic paper feeder having a built-in drive motor, it is required to eliminate unnecessary load on the drive motor.

Therefore, for example, by switching the drive transmission to the gears on the paper feed roller side or the gears on the paper discharge roller side by conversion of the forward / reverse rotation direction of the drive motor, only the paper feed roller at the time of paper feeding and the gear at the paper discharge roller side are discharged. An automatic paper feeding device for driving only a paper ejection roller is known as shown in Japanese Patent Application Laid-Open No. 2-9667 (FIGS. 9 and 10). In FIG. 9, 101 is a side plate, which is a side plate 101. Is provided with a drive motor 102, and the drive motor 102
A motor gear 103 is provided coaxially with. Motor gear 1
The large gear 104B of the sun gear 104 meshes with 03.

Reference numeral 105 denotes a planetary gear which meshes with a small gear 104A of the sun gear 104, and the planetary gear 105 is pivotally supported by a switching lever 106 supported by a sun gear shaft 105A.

The planetary gear 105 revolves at a predetermined angle by changing the rotation direction of the sun gear 104 and switches the drive transmission to the reduction gear 107 on the paper feed side or the reduction gear 108 on the paper ejection side.

Then, the driving force transmitted to the reduction gear 107 is transmitted to the sheet feeding gear 110 via the intermediate gear 109 and the sheet feeding roller shaft 110A.
To rotate a paper feed roller (not shown).

In addition, the driving force transmitted to the reduction gear 108 is the paper ejection gear 111.
To rotate the discharge roller shaft 111A and rotate the discharge roller (not shown).

Then, as shown in FIG. 9, when the drive motor 102 rotates in the normal direction, the driving force is transmitted from the planetary gear 105 to the reduction gear 107, so that the paper feed roller is rotated to perform paper feed.

On the other hand, as shown in FIG. 10, when the drive motor 102 rotates in the reverse direction, the driving force is transmitted from the planetary gear 105 to the reduction gear 108,
Therefore, the paper discharge roller is rotated to discharge the paper.

[Problems to be solved by the device]

In the conventional automatic paper feeder clutch mechanism, the drive motor
The load of only one of the paper feed roller and the paper discharge roller is applied to 102, and the load of both rollers is not applied at the same time. Therefore, the output of the drive motor 102 is reduced and the drive motor 102
Can be small, lightweight and inexpensive.

Further, after the paper is fed from the paper feed roller to the platen of the printer, the drive motor 102 is rotated in reverse (rotation of the paper discharge roller).
As a result, since the paper feed roller is in an idle state, the pulling force of the platen of the printer can be reduced, the output of the motor of the printer can be reduced, and the drive motor 102 can be made small, lightweight and inexpensive.

However, in order to support the planetary gear 105 on the sun gear 104, not only the switching lever 106 and a member that rotatably attaches the planetary gear 105 to the switching lever are required, but also these members are the sun gear 104, The switching lever 106, which is arranged in the axial direction (width direction) of the planetary gear 105 and swings, projects outward, and requires a space in the width direction. As a result, the size of the automatic paper feeder is increased and the weight is increased.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to reduce the number of parts used and to reduce the axial dimension to achieve size reduction and weight reduction. It is to provide a clutch mechanism for the device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a drive motor for feeding or ejecting paper, a sun gear that can be rotated in forward and reverse directions by receiving a driving force of the drive motor, and a sun gear that meshes with a gear portion of the sun gear. The planetary gear that revolves at a predetermined angle by changing the rotation direction of the drive gear to switch the drive transmission to the gear on the paper feed side or the gear on the paper discharge side, the paper feed roller that receives the driving force from the gear on the paper feed side, and the In a clutch mechanism of an automatic paper feeder including a paper discharge roller that receives a driving force from a gear, the sun gear is composed of a gear unit and a flange integrated with the gear unit,
In the gear portion, a transmission gear that transmits the driving force and the planetary gear mesh with each other, and an annular groove that slidably supports one side of the gear shaft of the planetary gear is formed on the end surface of the flange. It has a holding means that works only when the drive transmission of the planetary gear is switched and that holds the planetary gear integrally with the sun gear.

It should be noted that the sun gear may be integrally formed of a small gear portion and a large gear portion, a planet gear may be meshed with the small gear portion, and a transmission gear for transmitting the driving force may be meshed with the large gear portion.

[Action]

In the present invention, the automatic paper feeder has a holding means that operates only when the drive transmission of the planetary gears is switched, and when the drive transmission of the planetary gears is switched, the sun gear moves the planetary gears through the holding means. The planetary gears can revolve.

And, since one side of the gear shaft of the planet gear is slidably supported in the annular groove of the sun gear, one side of the gear shaft of the planet gear revolves around the sun gear, and the planet gear rotates around the sun gear. Revolve around.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show a clutch mechanism of an automatic paper feeder according to a first embodiment of the present invention.

In FIGS. 1 to 3, reference numeral 1 denotes a side plate, on which a drive motor 2 is provided, and a motor gear 3 is provided coaxially with the drive motor 2.

The side plate 1 has an idle gear 4 that meshes with the motor gear 3.
Is externally installed, and the idle gear 4 is the gear 6 of the sun gear 5.
Meshes with. A stud 7 is provided on the side plate 1, and an arcuate elongated hole 8 is provided at a position above the stud 7.

The shaft hole 5A of the sun gear 5 is fitted onto the stud 7, and the sun gear 5 is held by the stud 7 via the screw 9.

An annular groove 11 is formed on the inner end surface 10A of the flange 10 of the sun gear 5.

Reference numeral 12 denotes a planetary gear, which meshes with a gear 6 integrally formed with the sun gear 5 together with its flange 10 and revolves at a predetermined angle by conversion of the rotation direction of the sun gear 5 to cause a paper feed roller gear 16 on the paper feed side or a discharge roller gear described later. The drive transmission is switched to the idle gear 20 on the paper side. The planetary gear 12 has an inner gear shaft 13 and an outer gear shaft 14 which respectively project from both end surfaces thereof, and an oil groove 14A is formed in an annular shape in the outer gear shaft 14. Planetary gear 12
The inner gear shaft 13 is slidably fitted in the arcuate elongated hole 8 of the side plate 1, and the outer gear shaft 14 is fitted in the annular groove 11 of the sun gear 5. The annular groove 11 is filled with high-viscosity grease as a holding means for holding the planetary gear 12 integrally with the sun gear 5 only when the drive transmission of the planetary gear 12 is switched.

A paper feed roller shaft 15 is provided on the side plate 1, and a paper feed roller gear 16 is fixed to an end of the paper feed roller shaft 15.
When the drive motor 2 rotates in the normal direction, the feed roller gear 16 and the planetary gear 12
Mesh with each other. A paper feed roller 17 is fixed to the paper feed roller shaft 15.

Further, a paper discharge roller shaft 18 is provided on the side plate 1, a paper discharge roller gear 19 is fixed to an end of the paper discharge roller shaft 18, and a paper discharge idle gear 20 meshes with the paper discharge roller gear 19. . A paper discharge roller 21 is fixed to the paper discharge roller shaft 18. When the drive motor 2 rotates in the reverse direction, the idle gear 20 for paper ejection
The planetary gear 12 meshes with.

 Next, the operation of this embodiment will be described.

FIG. 1 shows the state when the paper feed roller 17 is driven (when the paper is fed).
FIG. 4 shows a state in which the drive of the planetary gear 12 is being switched, and FIG. 5 shows a state in which the paper discharge roller 21 is being driven (at the time of paper discharge).

As shown in FIG. 1, when the paper is fed, the drive motor 2
When the motor is rotated in the normal direction, the driving force of the drive motor 2 is as follows: drive motor 2 → motor gear 3 → idle gear 4 → sun gear 5 (gear 6) → planetary gear 12 → feed roller gear 16 → feed roller 17 Is transmitted to the paper feed roller 17. At this time, the inner gear shaft 13 of the planetary gear 12 comes into contact with the end portion 8A (shown in FIG. 3) of the arcuate elongated hole 8 and the planetary gear 12 rotates. In addition, the planetary gear 12
Is separated from the idle gear 20 for paper ejection, so the paper ejection roller
No driving force is transmitted to 21.

Then, when the drive motor 2 is switched from the normal rotation to the reverse rotation, the planet gear 12 and the feed roller gear 16 are disengaged from each other due to the viscosity of the grease filled in the annular groove 11. Then, due to the grease, a frictional force is generated between the annular groove 11 of the sun gear 5 and the outer gear shaft 14 of the planetary gear 12 supported by this, and the frictional force causes the planetary gear 12 to move. Are held together. Therefore, the sun gear 5 is a planetary gear.
The planetary gear 12 revolves around 12 and revolves to reach the state of FIG. 5 from the state of FIG. 1 through the state of FIG. At the time of this revolution, the inner gear shaft 13 of the planetary gear 12 revolves along the arcuate elongated hole 8 and the outer gear shaft 14 revolves along the annular groove 11.

When the mesh between the planetary gear 12 and the paper feed roller gear 16 is released, the paper feed roller 17 becomes free, and the paper is pulled out by the platen (not shown) of the printer. The paper feed roller 17 rotates around with the paper, but at this time, the paper feed roller 17 rotates lightly because there is no meshing of the gears of the drive transmission system.

In FIG. 5, the drive motor 2 rotates in the reverse direction, and the drive force of the drive motor 2 is as follows: drive motor 2 → motor gear 3 → idle gear 4 → sun gear 5 → planetary gear 12 → sheet idle gear 20 → sheet discharge The roller gear 19 and the paper discharge roller 21 are transmitted in this order to the paper discharge roller 21, and the paper discharge roller 21 rotates in the paper discharge direction.
At this time, the inner gear shaft 13 of the planetary gear 12 contacts the end portion 8B of the arcuate elongated hole 8, and the planetary gear 12 stops revolving and rotates on its axis. Further, since the planetary gear 12 is separated from the feed roller gear 16, the driving force is not transmitted to the feed roller 17.

According to the above configuration, the outer gear shaft 14 of the planetary gear 12 is the sun gear even if there is no member for supporting the planetary gear on the switching lever and the switching lever for supporting the planetary gear on the sun gear in the conventional example. 5, the planetary gear 12 is held integrally with the sun gear 5 through the grease only when the drive transmission of the planetary gear 12 is switched, so that the drive transmission is switched. As a result, the outer gear shaft 14 of the planetary gear 12 can revolve around the sun gear 5. That is, the planetary gear 12 is the paper feed roller gear 16
Alternatively, it becomes possible to switch the drive transmission to the idle gear 20 for paper discharge, and revolve around the sun gear 5.

As a result, the conventional switching lever and a member for supporting the planetary gear on the switching lever can be eliminated, and the number of parts used can be reduced.

Further, since the switching lever and a member for supporting the planetary gear on the switching lever are not necessary, these members are the sun gear.
5. The space in the width direction can be reduced without being arranged in the axial direction (width direction) of the planetary gears 12, and the automatic paper feeding device can be downsized and the weight can be reduced.

FIGS. 6 and 7 show the essential parts of the clutch mechanism of the automatic paper feeder according to the second embodiment of the present invention, and only the parts different from the first embodiment will be explained. The same components as those in the first embodiment are designated by the same reference numerals.

In the second embodiment, the large gear 21 and the small gear 6 are integrally formed on the sun gear 5, and the end surface 21A of the large gear 21 has an annular groove 1.
1 is formed. The idle gear 4 meshes with the large gear 21 of the sun gear 5, and the planetary gear 12 meshes with the small gear 6.

With the above configuration, the difference from the first embodiment is that the drive force of the drive motor 2 receives the drive force from the idle gear 4 in the sun gear 5 at the large gear 21 and transmits it from the small gear 6 to the planetary gear 12. , And others are the same, so they are omitted.

FIG. 8 shows a main part of a clutch mechanism of an automatic paper feeder according to a third embodiment of the present invention, and only parts different from the second embodiment will be described. The same components as those in the second embodiment are designated by the same reference numerals.

The third embodiment uses a torsion spring 31 in place of the grease as the holding means of the second embodiment, and the torsion spring 31 is formed integrally with the torsion portion 32. It is composed of a pair of arms 33, 33 that are formed. The twisting portion 32 is annularly mounted on a step portion 34 provided on the outer gear shaft 13 side of the planetary gear 12, and the arms 33, 33 hold a spring receiving groove 35A of a shaft portion 35 provided on the sun gear 5. ing.

In such a configuration, the arms 33, 33 of the torsion spring 31 are
The frictional resistance between the spring receiving groove 35 and the spring receiving groove 35 causes the torsion spring 31 to rotate along with the shaft portion 35 of the sun gear 5 when the drive transmission of the planetary gear 12 is switched. This torsion spring 31
The rotation of the planet gear 12 rotates. That is, the planetary gear 12
Revolves around the sun gear 5 via a torsion spring 31.

According to the third embodiment, the same action and effect as those of the second embodiment can be obtained.

[Effect of device]

As described above, according to the present invention, even if there is no switching lever for supporting the planetary gear on the sun gear and the member for supporting the planetary gear on the switching lever in the conventional example, one of the gear shafts of the planetary gear is The side is slidably supported in the annular groove of the sun gear, and the planetary gear is held integrally with the sun gear via the holding means only when the drive transmission of the planetary gear is switched. As possible,
One side of the gear shaft of the planetary gear can revolve around the sun gear. That is, the planetary gear can switch the drive transmission with respect to the gear on the paper feed side or the gear on the paper discharge side, and can revolve around the sun gear.

As a result, the conventional switching lever and a member for supporting the planetary gear on the switching lever can be eliminated, and the number of parts used can be reduced.

Further, since the switching lever and members for supporting the planetary gears on the switching lever are not required, these members are not arranged in the axial direction (width direction) of the gear, and the space in the width direction is reduced. Therefore, it is possible to reduce the size of the automatic paper feeder and reduce the weight.

[Brief description of drawings]

FIG. 1 is a side view of a clutch mechanism of an automatic paper feeder according to a first embodiment of the present invention. FIG. 2 is a sectional view of an essential part of a clutch mechanism of the automatic paper feeder. FIG. 3 is a perspective view showing the sun gear and the planetary gears of FIG. FIG. 4 and FIG. 5 are explanatory views of the operating state of the clutch mechanism of the automatic paper feeder. FIG. 6 is a sectional view showing an essential part of a clutch mechanism of an automatic paper feeder according to a second embodiment of the present invention. FIG. 7 is a perspective view of FIG. FIG. 8 is a perspective view showing a main part of a clutch mechanism of an automatic paper feeder according to a third embodiment of the present invention. 9 and 10 are side views of a clutch mechanism of a conventional automatic sheet feeder. [Explanation of symbols of main parts] 2 ... Drive motor 5 ... Sun gear 6 ... Gear 10 ... Flange 10A ... Inner end face 11 ... Annular groove 12 ... Planetary gear 14 ... Outer gear shaft 16 …… Paper feed roller gear 17 …… Paper feed roller 20 …… Paper ejection idle gear 21 …… Paper ejection roller.

Claims (2)

(57) [Scope of utility model registration request] 1. A drive motor for feeding or discharging a sheet,
Driven by the drive force of the drive motor, the sun gear can rotate forward and backward, and it meshes with the gear part of the sun gear and revolves at a predetermined angle by converting the rotation direction of the sun gear to drive the gear on the paper feed side or the gear on the paper discharge side. In a clutch mechanism of an automatic paper feeding device, which comprises a planetary gear that switches transmission, a paper feeding roller that receives a driving force from a gear on the paper feeding side, and a paper ejection roller that receives a driving force from a gear on the paper ejection side, The gear is composed of a gear portion and a flange integral with the gear portion, and the transmission gear for transmitting the driving force and the planetary gear mesh with the gear portion, and one end of the flange has one of the gear shafts of the planetary gear. And a holding means for holding the planetary gear integrally with the sun gear by forming an annular groove for slidably supporting the side and acting only when the drive transmission of the planetary gear is switched. Class of automatic paper feeder Ji mechanism. 2. A sun gear is integrally formed of a small gear portion and a large gear portion, a planetary gear is meshed with the small gear portion, and a transmission gear for transmitting the driving force is meshed with the large gear portion. The clutch mechanism of the automatic paper feeder according to claim 1.