JP2001239714A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect gears against damage while eliminating useless space by disposing a motor and a reduction gear in a tubular roller. SOLUTION: The electronic apparatus comprises a motor 5, a sun gear 7, and a planetary gear 8 disposed in a tubular roller 2, a first annulus gear 10 provided on the inner surface of the tubular roller 2, a second annulus gear 11 provided on the inner surface of a bearing body 12 led out to the outside of the tubular roller 2 wherein the shaft 13 of the bearing body 12 is supported resiliently while being pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus having a cylindrical roller for feeding paper, such as a printer.

[0002]

2. Description of the Related Art In a conventional electronic apparatus of this type, a cylindrical roller for feeding paper is connected to a motor via a reduction gear.

[0003] In recent years, electronic devices have been increasingly miniaturized, and thus there has been a demand for miniaturization of the driving mechanism of the cylindrical roller.

Therefore, it is conceivable to incorporate a drive mechanism in a cylindrical roller as disclosed in Japanese Patent Application Laid-Open No. 22635/1990.

[0005] Specifically, when such a structure is to be formed, the following structure is provided. That is, a cylindrical roller having both ends opened, a motor housed at one end side in the cylindrical roller, a sun gear provided on the shaft of the motor in the cylindrical roller, and a sun gear provided in the cylindrical roller. The planetary gears mesh with each other, a first internal gear provided on the inner surface of the cylindrical roller facing the planetary gears, and a second internal gear meshing with the planetary gears.

[0006]

In the above prior art, since the second internal gear is fixed to the motor, the cylindrical roller cannot be manually rotated by force.

That is, the first internal gear of the cylindrical roller meshes with the second internal gear via the planetary gear,
The internal gear is fixed to a motor, and since this motor is fixed to a fixed portion outside the one end opening of the cylindrical roller, the cylindrical roller cannot be manually rotated, and it is forcibly rotated. In this case, there is a problem that the planetary gear and the first and second internal gears are damaged.

Accordingly, an object of the present invention is to prevent the planetary gear, the first and second internal gears from being damaged even when the cylindrical roller is manually rotated.

[0009]

According to the present invention, there is provided a cylindrical roller having both ends opened, and a motor having at least one motor shaft housed at one end in the cylindrical roller. A sun gear provided on the motor shaft in the cylindrical roller, a planetary gear meshed with the sun gear in the cylindrical roller, and a sun gear provided on an inner surface of the cylindrical roller opposed to the planetary gear. A bearing body having at least one internal gear and a second internal gear meshing with the planetary gear, at least a support shaft of which is arranged on the other end side of the cylindrical roller; A bearing mechanism for rotatably supporting the cylindrical roller, wherein a fixing portion for the motor is provided at one end of the cylindrical roller, and a support shaft of the bearing body is provided at the other end of the cylindrical roller. It is obtained by holding the elastic pressing by the holding unit.

With the above arrangement, the support shaft of the bearing body is elastically pressed and held by the holding portion at the other end of the cylindrical roller. When a force equal to or more than a predetermined value is applied, the support shaft of the bearing body starts rotating against the elastic pressing and holding by the holding body, and as a result, the planetary gear, the first and second internal gear parts Etc. can be prevented from being damaged.

That is, the cylindrical roller and the bearing body are connected via the first internal gear, the planetary gear, and the second internal gear, and the cylindrical roller or the support shaft is intentionally rotated as described above. In such a case, the cylindrical roller and the support shaft are rotated by the rotation of the support shaft portion against the holding by the holding body. As a result, as described above, the planetary gear, the first and the second shafts are rotated. The internal gear is not damaged.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The invention according to a first aspect of the present invention is directed to a cylindrical roller having both ends open, a motor having at least one motor shaft housed at one end inside the cylindrical roller, A sun gear provided on the motor shaft in a roller; a planetary gear meshed with the sun gear in the cylindrical roller; and a first internal tooth provided on an inner surface of the cylindrical roller opposed to the planetary gear. A gear having a second internal gear meshed with the planetary gear, and at least a support shaft of which is disposed at the other end of the cylindrical roller; and rotating the cylindrical roller with respect to the bearing. A bearing portion for freely supporting the motor, a fixing portion for the motor is provided on one end side of the cylindrical roller, and a supporting shaft of the bearing body is elastically pressed by a holding portion on the other end side of the cylindrical roller. An electronic apparatus is lifting,
Since the support shaft of the bearing body is elastically pressed and held by the holding portion at the other end side of the cylindrical roller, when a force equal to or more than a predetermined value in the direction of rotating them is applied to the cylindrical roller, or the support shaft of the bearing body, The support shaft of the bearing body starts rotating against the elastic pressing and holding by the holding body, and as a result, damage to the planetary gears, the first and second internal gear parts, and the like can be prevented. .

That is, the cylindrical roller and the bearing body are connected via the first internal gear, the planetary gear, and the second internal gear, and the cylindrical roller or the support shaft is intentionally rotated as described above. In such a case, the cylindrical roller and the support shaft are rotated by the rotation of the support shaft portion against the holding by the holding body. As a result, as described above, the planetary gear, the first and the second shafts are rotated. The internal gear is not damaged.

According to the invention of claim 2 of the present invention, the holding portion is formed by a plate having a through hole through which the support shaft passes, and the support shaft portion located on at least one of the inside and the outside of the plate body has elasticity. 2. The electronic device according to claim 1, wherein the body is pressed, and the force at which the support shaft starts rotating can be easily changed by changing the elastic force of the elastic body.

According to a third aspect of the present invention, a rotation suppressing body is provided on the outer periphery of the support shaft, the outer peripheral shape of the rotation suppressing body is polygonal, and a plate is formed on the outer periphery of the rotation suppressing body as an elastic body. The electronic device according to claim 2, wherein the spring is pressed, wherein the outer periphery of the rotation suppressing body is formed into a polygon, and a leaf spring is pressed against the polygon, whereby stepwise rotation of each side of the polygon is performed. You can do it.

According to a fourth aspect of the present invention, there is provided an electronic apparatus according to the second aspect, wherein a leaf spring is provided as an elastic body, and a friction member is provided at a contact portion of the leaf spring with a support shaft. The rotation suppressing force of the support shaft is increased by the friction member, and the rotation suppressing force can be appropriately set by setting the type and shape of the friction member.

According to a fifth aspect of the present invention, the holding portion is formed of a plate having a through hole through which the support shaft passes, and a bush is fitted into the through hole of the plate, and the bush is penetrated. 2. The electronic device according to claim 1, wherein the bush is elastically deformed to penetrate the support shaft through the hole, and the bush alone can generate a rotation suppressing force with respect to the support shaft.
The structure is simple and can contribute to miniaturization.

According to a sixth aspect of the present invention, there is provided the electronic apparatus according to the second aspect, wherein a plurality of leaf springs are pressed against the support shaft from the outer periphery of the through hole of the plate body. By pressing them from the outer periphery to the support shaft, the rotation suppressing force of the support shaft becomes stable.

According to a seventh aspect of the present invention, the holding portion is formed by a plate having a through-hole through which the support shaft passes, and a friction member is provided on at least one of the inside and outside of the plate body on the support shaft portion. The friction member is pressed against the plate by a spring.
In the electronic device described in (1), the rotation suppressing force of the support shaft can be easily changed by adjusting the pressing force by the spring.

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

In FIGS. 1 and 2, reference numeral 1 denotes a cover having an open lower surface. The cover 1 covers the cylindrical roller 2 in a non-contact state. As shown in FIG. 3, the cylindrical roller 2 has a configuration in which a cylindrical body 3 made of metal such as aluminum is covered with a cylindrical body 4 made of an elastic material such as silicon rubber.

A motor 5 is accommodated in the cylindrical roller 2 in a non-contact state, and a sun gear 7 is connected to a motor shaft 6 of the motor 5 as shown in FIG. The sun gear 7 meshes with two planetary gears 8. These two planetary gears 8 are supported by a carrier 9 at a predetermined interval, and the sun gear 7
Are engaged from the inside. A first internal gear 10 provided inside the cylindrical body 3 meshes with a portion of the planetary gear 8 on the motor 5 side.
The second internal gear 11 meshes with a portion on the side opposite to the motor 5 side.

The second internal gear 11 is provided on the inner surface side of a cap-shaped bearing body 12, and a support shaft 13 is integrally provided on the other end opening side of the cylindrical body 3 of the bearing body 12. ing. The shaft 9a of the carrier 9 is provided with a cap-shaped bearing 12
Is pivotally supported by the concave portion 12a at the bottom. Motor 5
Is held by a support 14, and at the one end opening side of the cylindrical body 3, the support 14 is fixed to a plate 18 as shown in FIG.

A bearing mechanism 15 is provided on the outer periphery of the support shaft 13 and the support 14 as shown in FIG. 3, and rotatably supports the cylindrical body 3. Reference numeral 16 denotes a power supply line, which is drawn into the cylindrical body 3 from outside the cylindrical body 3 via a hollow portion of the support 14 in order to supply power to the motor 5 from outside the cylindrical body 3.

In the above configuration, the number of teeth of the first internal gear 10 is set to, for example, 36, the gear of the second internal gear 11 is set to, for example, 34, and the planetary gear 8 is rotated by the rotation of the sun gear 7. Revolving around 7, two planetary gears 8
Is meshed with the first internal gear 10 and the second internal gear 11, so that a rotation difference of two teeth, that is, a shift is generated per revolution of the planetary gear 8.

Further, as shown in FIG. 5, a support shaft 13 having the second internal gear 11 has a plate body 18a having a through hole 17 as shown in FIG.
And a rotation suppressor 19 made of synthetic resin is provided on the outer periphery of the flat portion 13 a of the support shaft 13. This rotation suppressing body 19
As shown in FIG. 6, the outer periphery is a polygon, specifically an octagon, and the free end of the leaf spring 20 is pressed against the outer periphery to suppress the rotation.

The side of the leaf spring 20 opposite to the free end is fixed to, for example, the plate 18a, although not shown.

In such a state, when the motor 5 is energized through the power supply line 16, the rotation of the sun gear 7 causes the planetary gear 8 to revolve, and the first internal gear 10 and the second internal gear 11 are rotated. Deviation occurs. At this time, since the rotation of the bearing body 12 provided with the second internal gear 11 is stopped by the rotation suppressing body 19 as described above, the first internal gear 10, that is, the cylindrical body 3 Rotates together with the cylindrical body 4. The rotation of the cylindrical bodies 3 and 4, that is, the rotation of the cylindrical roller 2, as shown in FIG.
Is transported as indicated by arrow A.

Here, the thermal head 22 is arranged on the surface of the belt-shaped paper 21 facing the cylindrical roller 2, and
Is a heat-sensitive paper, printing on the paper 21 is performed by energizing the thermal head 22 while feeding the paper 21.

Now, for example, at the end of printing, ie, when the motor 5
It is assumed that in the state where no power is supplied to the paper 21, it is attempted to further pull out the fed paper 21 or the cylindrical roller 2 is intentionally turned by hand or the like. In this case, in the present embodiment, the leaf spring 20 in the configuration of FIG.
When a rotational force equal to or more than a predetermined force set by the pressing force is applied to the cylindrical roller 2, the rotational force applied to the cylindrical roller 2 becomes
The first internal gear 10, the planetary gear 8 connected thereto, and the second internal gear 11 are transmitted to the
Is rotated stepwise for each side of the polygon provided on the rotation suppressing body 19 against the rotation suppression by the rotation suppressing body 19, and at this time, the cylindrical roller 2 is also integrally formed. To rotate stepwise. As a result, it is possible to prevent the planetary gear 8, the first and second internal gears 10, 11 and the like from being damaged.

FIGS. 7 and 8 show a second embodiment of the present invention. The bearing 12 and the support shaft 13 which are connected to the second internal gear 11 and are integrated with each other as shown in FIG. It penetrates a plate 18a having a through hole 17. Further, a columnar rotation suppressor 24 made of synthetic resin is provided on the outer periphery of the flat portion 13a of the support shaft 13. A rubber 25 used as an example of a friction member is pressed against the outer periphery of the rotation suppressing body 24 by a leaf spring 20 to suppress the rotation of the support shaft 13.

The rubber 25 is fixed to the free end of the leaf spring 20, and the other end of the leaf spring 20 is fixed to, for example, the plate 18a although not shown. According to this configuration,
The rotation suppressing force of the support shaft 13 is increased by the friction force between the rubber 25 pressed by the leaf spring 20 and the rotation suppressing body 24, and the rotation suppressing force is appropriately set by setting the type and shape of the friction member. Can be done.

FIG. 9 shows a third embodiment of the present invention.
The support shaft 13 of the bearing body 12 integrated with the second internal gear 11 shown in FIG. 3 passes through a hole of a rubber bush 26 having a smaller hole diameter than the support shaft 13.
6 is elastically deformed so as to penetrate through the through hole 17, and the rotation of the support shaft 13 is suppressed by the elasticity of the bush 26 alone.

Note that the support shaft 13 in FIG. 9 does not have the flat portion 13a, but has a columnar shape.

FIGS. 10 and 11 show a fourth embodiment of the present invention. In FIG. 10, the small diameter of the support shaft 13 of the bearing body 12 integrated with the second internal gear 11 shown in FIG. The cylindrical portion 13b penetrates a plate 18a having a through hole 17. Four leaf springs 27 are pressed against the outer periphery of the small-diameter cylindrical portion 13b from the outer periphery. In the present embodiment, the four leaf springs 27 are formed of a disc-shaped metal plate, preferably a steel plate for a spring as shown in FIGS. 10 and 11, and are formed by punching out four fan-shaped cutouts 28 with a press or the like. It is formed with. Then, the four leaf springs 27 are pressed against the small-diameter cylindrical portion 13b at regular intervals, thereby applying a stable rotation suppressing force to the support shaft 13. It is desirable that the four leaf springs 27 are arranged equally at 90 degrees on the outer periphery of the small-diameter cylindrical portion 13b of the support shaft 13,
Therefore, if the number of the leaf springs 27 is two, it is 180 degrees, if it is three, it is 120 degrees, and if it is five, it is 72 degrees.

FIGS. 12 and 13 show a fifth embodiment of the present invention. In FIG. 12, the holding of the support shaft 13 of the bearing body 12 integrated with the second internal gear 11 shown in FIG. The department is
The support shaft 13 is formed by a plate body 18a having a through hole 17 penetrating the flat portion 13a. A friction member 29 having an uneven surface 30 is provided inside the plate body 18a, and the flat portion 13a of the support shaft 13 is inserted into a through hole 32 of the friction member 29.
, And in this state, the inner surface of the plate 18 a was pressed by the spring 31. According to this configuration, the force for suppressing the rotation of the support shaft 13 can be easily changed by adjusting the pressing force by the spring 31. In the present embodiment, the through hole 32 of the friction member 29 has a flat shape like the flat portion 13a of the support shaft 13, but the flat portion is formed so that the support shaft 13 can slide in the axial direction. 13a is slightly larger. Therefore, the uneven surface 30 can be reliably pressed against the inner surface of the plate 18a by the pressing force of the spring 31. The support shaft 13 and the through hole 3
It is sufficient that at least one flat portion provided at 2 is provided to suppress rotation.

[0037]

As described above, according to the present invention, there is provided a cylindrical roller having both ends opened, a motor having at least one motor shaft housed at one end of the cylindrical roller,
A sun gear provided on the motor shaft in the cylindrical roller, a planetary gear meshed with the sun gear in the cylindrical roller, and a first gear provided on an inner surface of the cylindrical roller opposed to the planetary gear. A bearing having an internal gear, a second internal gear meshing with the planetary gear, at least a support shaft of which is arranged on the other end side of the cylindrical roller; And a bearing mechanism for rotatably supporting the bearing. A fixing portion for the motor is provided at one end of the cylindrical roller, and a support shaft of the bearing body is elastically pressed by a holding portion at the other end of the cylindrical roller. If the electronic device is held by the above configuration, the support shaft of the bearing is elastically pressed and held by the holding portion at the other end of the cylindrical roller. When a force equal to or more than a predetermined value is applied to the shafts in a direction for rotating them, the support shaft of the bearing body starts rotating against the elastic pressing and holding by the holding body. As a result, the planetary gear, the first , The second internal gear portion and the like can be prevented from being damaged.

That is, the cylindrical roller and the bearing body are connected via the first internal gear, the planetary gear, and the second internal gear, and the cylindrical roller or the support shaft is intentionally rotated as described above. In such a case, the cylindrical roller and the support shaft are rotated by the rotation of the support shaft portion against the holding by the holding body. As a result, as described above, the planetary gear, the first and the second shafts are rotated. The internal gear is not damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a perspective view of FIG. 1 with a cover removed.

FIG. 3 is a sectional view of the cylindrical roller.

FIG. 4 is an exploded perspective view of the cylindrical roller portion.

FIG. 5 is a sectional view of a main part of a cylindrical roller.

FIG. 6 is a side view of a main part of the cylindrical roller.

FIG. 7 is a sectional view of a main part according to a second embodiment of the present invention.

FIG. 8 is a side view of the main part.

FIG. 9 is a sectional view of a main part according to a third embodiment of the present invention.

FIG. 10 is a sectional view of a main part according to a fourth embodiment of the present invention.

FIG. 11 is a side view of the main part.

FIG. 12 is a sectional view of a main part according to a fifth embodiment of the present invention.

FIG. 13 is a perspective view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 2 Cylindrical roller 3 Cylindrical body 4 Cylindrical body 5 Motor 6 Motor shaft 7 Sun gear 8 Planetary gear 9 Carrier 10 1st internal gear 11 Second internal gear 12 Bearing 13 Support shaft 14 Support 15 Bearing mechanism Reference Signs List 16 power supply line 17 through hole 18 plate 18a plate 19 rotation suppressor 20 plate spring 21 paper 22 thermal head 24 columnar rotation suppressor 25 rubber 26 bush 27 plate spring 28 cutout portion 29 friction member 30 uneven surface 31 spring 32 Through hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kenji Nakaso 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Toshio Tanaka 1006 Kadoma Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 2C058 AF29 AF31 DA10 2C480 CA02 CB01 CB12 CB15 CB28 3F049 CA21 LA02 LA07 LB01

Claims (7)

[Claims] 1. A cylindrical roller having both ends open, a motor in which at least one end of a motor shaft is accommodated in one end of the cylindrical roller, and a sun gear provided on the motor shaft in the cylindrical roller. A planetary gear meshed with the sun gear in the cylindrical roller, and a first gear provided on an inner surface of the cylindrical roller facing the planetary gear.
And a bearing body having a second internal gear meshing with the planetary gear, at least a support shaft of which is disposed on the other end side of the cylindrical roller, and the cylindrical body with respect to the bearing body. A bearing mechanism for rotatably supporting the roller, a fixing portion for the motor is provided at one end of the cylindrical roller, and a support shaft of the bearing body is elastically held by a holding portion at the other end of the cylindrical roller. Electronic equipment pressed and held. 2. The holding portion is formed of a plate having a through hole through which the support shaft passes, and an elastic body is pressed against at least one of a support shaft located inside and / or outside the plate. An electronic device according to claim 1. 3. A rotation suppressing body is provided on the outer periphery of the support shaft, the outer periphery of the rotation suppressing body is polygonal, and a leaf spring is pressed against the outer periphery of the rotation suppressing body as an elastic body. An electronic device according to claim 1. 4. The electronic apparatus according to claim 2, wherein a leaf spring is provided as an elastic body, and a friction member is provided at a contact portion of the leaf spring with a support shaft. 5. The holding portion is formed of a plate having a through hole through which a support shaft penetrates, a bush is fitted into the through hole of the plate body, and the support shaft is fitted into the through hole of the bush. The electronic device according to claim 1, wherein the electronic device is elastically deformed and penetrated. 6. The electronic device according to claim 2, wherein a plurality of leaf springs are pressed against the support shaft from the outer periphery of the through hole of the plate body. 7. The holding portion is formed by a plate having a through hole through which a support shaft penetrates, and a friction member is provided on a support shaft portion in at least one of the inside and outside of the plate, and the friction member is connected to the plate body. The electronic device according to claim 1, wherein the electronic device is pressed by a spring.