JP2002193474A - Printer driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in a conventional printer that the miniaturization of the printer is limited because a motor, a reduction gear and the like are arranged in parallel out of a carrying roller. SOLUTION: This printer driver comprises a cylindrical carrying roller 10 having a rotating internal gear 13 formed on the inside; the motor 17 having a sun gear 21 fixed to a rotating shaft 20; a fixed internal gear 16 having a tooth number differed from the rotating internal gear 13; an epicyclic gear 14 meshed with the sun gear 21, the rotating internal gear 13, and the fixed internal gear 16; and a frame 18 for rotatably supporting one end of the cylindrical carrying roller 10 and fixing the motor 17 concentrically with the cylindrical carrying roller 10. According to such a structure, the printer driver can be easily miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a printer driving device which is incorporated in a printer such as a portable terminal device and conveys a print sheet.

[0002]

2. Description of the Related Art In recent years, the number of printers incorporated in portable terminal equipment has been increasing, and the printer driver incorporated in the portable terminal equipment has been required to be further reduced in size.

A conventional printer driving device is configured such that a conveying roller for conveying a print sheet is directly connected to a motor arranged in parallel with the motor via a plurality of reduction gears.

FIG. 6 shows such a conventional printer.
This will be described with reference to FIG.

FIG. 6 is a plan view of a conventional printer. In FIG. 6, a motor 2 having a drive gear 3 fixed to a rotating shaft is attached to a frame 1 and is arranged in parallel with the drive gear 3. A plurality of reduction gears 4 and a conveying roller 5 meshed with the reduction gears 4 and arranged in parallel with the motor 2.
Are rotatably mounted.

Then, the print head 6 is pressed against the transport roller 5 by a pressing means 7 such as a spring to constitute a printer.

In the above configuration, when the motor 2 rotates, the rotation is transmitted from the drive gear 3 fixed to the rotation shaft of the motor 2 to the transport roller 5 via a plurality of reduction gears 4 arranged in parallel. .

The rotation of the transport roller 5 transports the print sheet 8 disposed between the transport roller 5 and the print head 6 pressed against the transport roller 5, and simultaneously transfers the print sheet 8 to the print head 6. Power is supplied to the print head 6
Thus, characters and the like are printed on the print sheet 8.

[0009]

However, in the above-described conventional printer, since the transport roller 5 is arranged in parallel with the motor 2 and the reduction gear 4 as the driving source, there is a problem that the entire printer becomes large. there were.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a printer driving device which can be downsized.

[0011]

To achieve the above object, the present invention has the following arrangement.

According to the first aspect of the present invention, there is provided a cylindrical conveying roller having a rotating internal gear formed on an inner periphery thereof, a motor having a sun gear fixed to a rotating shaft, and a tooth different from the rotating internal gear. A fixed internal gear having a number, a planetary gear meshing with the sun gear and the rotating internal gear and the fixed internal gear, and rotatably supporting one end of a cylindrical transport roller, and coaxially with the cylindrical transport roller. A printer driving device is configured by a frame that fixes a motor to the motor, a speed reducing unit combining a plurality of gears is provided in the cylindrical transport roller, and the motor is disposed coaxially with the cylindrical transport roller. Therefore, there is an effect that a printer driving device that can be downsized can be obtained.

According to a second aspect of the present invention, in the first aspect of the invention, the fixed internal gear is pressed by a force greater than the driving force of the rotating internal gear on the inner periphery of the cylindrical conveying roller to regulate the rotation. An elastic member is provided, and the cylindrical conveying roller, which is the final deceleration means, is manually rotated directly or the printing sheet disposed between the cylindrical conveying roller and the head is forcibly pulled out to form a cylindrical member. When an external force equal to or more than a predetermined rotational force is applied to the transport roller, the fixed internal gear can be appropriately rotated to prevent the gear mechanism from being damaged.

According to a third aspect of the present invention, in the first aspect of the present invention, the solid internal gear is formed of an oil-impregnated sintered body. Since the oil is impregnated with the oil, the lubricating property of the sliding portion is increased, and the frictional load generated between the fixed internal gear and the cylindrical conveying roller can be reduced.

According to a fourth aspect of the present invention, in the first aspect of the invention, the inner circumference of the fixed internal gear other than the internal gear is supported by the outer circumference of a cylindrical member penetrating the frame. Yes, the head is pressed by the cylindrical member via the cylindrical conveying roller and the fixed internal gear, thereby reducing the bending generated at the fitting support between the cylindrical conveying roller and the fixed internal gear. This has the effect that the transport roller and the head can be uniformly contacted.

According to a fifth aspect of the present invention, in the first aspect of the invention, the cylindrical conveying roller is a two-stage throttle pipe having a large diameter and a small diameter, and the small diameter portion is supported by a frame. This has the effect that the cylindrical conveying roller can be supported on the frame without using different members.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

The same components as those described in the section of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 1) FIG. 1 is a sectional view of a printer driving apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the printer driving apparatus. In FIG. A metal cylindrical pipe 11 is formed by two-stage deep drawing, and the outer peripheral surface of the large-diameter portion 11A is covered with a cylindrical body 12 of an elastic material such as silicon rubber.
B is fitted to the bearing 23 and is rotatably supported by the frame 18.

A rotating internal gear 13 is formed on the inner periphery of the cylindrical conveying roller 10.
A planetary gear 14 rotatably supported by a carrier 15
The outside of A is engaged.

Reference numeral 16 denotes a fixed internal gear disposed coaxially with the rotary internal gear 13, which is formed of an oil-impregnated sintered body formed by molding and firing fine metal particles and impregnated with synthetic oil, mineral oil, or the like.
On the outer peripheral surface, a convex portion 16A sliding on the inner peripheral surface of the cylindrical transport roller 10 and a rotation suppressing portion 16B having a polygonal flat surface
However, the inner teeth of the inner peripheral surface have a different number of teeth than the rotating internal gear 13 in the cylindrical transport roller 10 and mesh with the outer side of the planetary gear 14B rotatably supported by the carrier 15. A gear 16C is formed.

Reference numeral 17 denotes a motor, which is a cylindrical member.
A sun gear 21 attached to a frame 18 coaxially with the cylindrical transport roller 10 and connected and fixed to a rotation shaft 20 of the motor 17 is inserted into a center hole 15A of the carrier 15 and is provided at a predetermined distance from the carrier 15. And meshes with the insides of the two planetary gears 14A and 14B rotatably supported at.

Reference numeral 22 denotes a regulating member having one end fixed to the frame 18, and an elastic member 22A at the other end includes a polygonal rotation suppressing portion 16B provided on the outer peripheral surface of the fixed internal gear 16, and a fixed internal gear. The rotation of the fixed internal gear 16 is suppressed by pressing with a force greater than the driving force of the fixed internal gear 16.

Further, the internal gear portion 1 of the fixed internal gear 16
The inner circumferential bearing 16D other than 6C is supported by the outer periphery of the cylindrical member 19 penetrating the frame 18.

Next, a printer using the printer driving device configured as described above will be described with reference to FIGS.

FIG. 3 is a perspective view of the printer, FIG. 4 is an exploded perspective view of the printer, and FIG. 5 is an exploded perspective view of the printer.
In the figure, reference numeral 29 denotes the printer driving device described above, and reference numeral 30 denotes a printer printing device. The printer is constituted by combining the printer driving device 29 and the printer printing device 30.

The printer printing apparatus 30 includes a U-shaped base frame 31 having a bottom plate and side plates rising upward from both sides thereof, a mounting plate 32, a print head 33, and a mounting plate 32. And a pressing spring 34 for pressing the print head 33 against the cylindrical transport roller 10.

In the above configuration, when the head 33 is pressed against the cylindrical transport roller 10 by the pressing spring 34, the force is applied to the cylindrical member fixed to the frame 18 via the convex portion 16A of the fixed internal gear 16. Since the pressing force is received by the member 19, the pressing force is not applied to the sun gear 21 fixed to the shaft 20 of the motor 17, and the rotation of the motor 17 is appropriately transmitted to the planetary gears 14A and 14B.

Therefore, when power is supplied to the motor 17 through the power supply line 26 to rotate the sun gear 21, the planetary gear 14
A and 14B revolve, and a gap is generated between the rotating internal gear 13 and the fixed internal gear 16 having different numbers of teeth.

At this time, the fixed internal gear 16 is
Since the rotation is stopped by the rotation suppressing portion 16B pressed by the second elastic member 22A, the cylindrical transport roller 10 provided with the rotating internal gear 13 is reduced in speed and rotates.

The rotation of the cylindrical transport roller 10 against which the head 33 is pressed causes the belt-shaped print sheet 25 disposed therebetween to be transported. When the head 33 is energized, characters and the like are printed on the print sheet 25. Then, information recording is performed.

When the printing sheet 25 is to be fed in a state where the motor 17 is not energized, the turning knob 24 attached to the cylindrical conveying roller 10 is turned.

In this case, since a rotational force equal to or more than the predetermined force set in the rotation suppressing portion 16B by the regulating member 22 is applied, this force is applied to the bearing portion 16D, the internal gear portion 16C, and the rotational force. The rotation is transmitted to the connected planetary gear 14A and the rotating internal gear 13 so that the cylindrical transport roller 10 provided on the rotation suppressing body 16B rotates stepwise for each side of the polygon, and the print sheet 25 is rotated. Is sent manually.

As described above, according to the present embodiment, the cylindrical conveying roller 10 having the rotating internal gear 13 formed on the inner periphery thereof.
And a motor 17 having a sun gear 21 fixed to a rotating shaft 20.
, A fixed internal gear 16 having a different number of teeth from the rotating internal gear 13, the sun gear 21 and the rotating internal gear 13
And a planetary gear 14 meshing with a fixed internal gear 16, and a rotatable support of one end of the cylindrical transport roller 10, and a printer driving device by a frame 18 fixing a motor 17 coaxially with the cylindrical transport roller 10. Since the device 29 is configured, the device can be reduced in size, and since it is unitized as a printer driving device, it can be easily assembled with a printer.

Further, by providing an elastic member 22 for pressing the fixed internal gear 16 with a force greater than the driving force of the rotary internal gear 13 on the inner periphery of the cylindrical conveying roller 10 and restricting the rotation, the deceleration finalizing means is provided. The cylindrical transport roller 10 is manually rotated directly, or the printing sheet 25 disposed between the cylindrical transport roller 10 and the head 33 is forcibly pulled out, so that the cylindrical transport roller 10 has a predetermined rotational force. When the above external force is applied, the fixed internal gear 16 can be appropriately rotated to prevent the gear mechanism from being damaged.

Since the fixed internal gear 16 is formed of an oil-impregnated sintered body, metal fine particles are formed and sintered, and then oil such as synthetic oil or mineral oil is impregnated. Lubricity is increased, and a friction load generated between the fixed internal gear 16 and the cylindrical transport roller 10 can be reduced.

Further, the inner circumference of the fixed internal gear 16 other than the internal gear is supported by the outer circumference of the cylindrical member 19 penetrating the frame 18, so that the head 33 is pressed against the cylindrical conveying roller 10 and It is received by the cylindrical member 19 via the fixed internal gear 16, the bending generated at the fitting support portion between the cylindrical transport roller 10 and the fixed internal gear 16 is reduced, and the cylindrical transport roller 10 and the head 33 are evenly contacted. Can be in contact.

Further, the cylindrical conveying roller 10 is a two-stage throttle pipe having a large diameter and a small diameter, and the small diameter portion is supported by the frame 18 so that the cylindrical conveying roller 10 can be used without using different members. 18 can be supported.

[0039]

As described above, according to the present invention, there is obtained an advantageous effect that it is possible to obtain a printer driving device capable of easily reducing the size.

[Brief description of the drawings]

FIG. 1 is a sectional view of a printer driving device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of the printer.

FIG. 4 is an exploded perspective view of the printer.

FIG. 5 is an exploded perspective view of the printer printing apparatus.

FIG. 6 is a plan view of a conventional printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cylindrical conveyance roller 11 Cylindrical pipe 12 Cylindrical body 13 Rotating internal gear 14A planetary gear 14B Planetary gear 15 Carrier 16 Fixed internal gear 16A Convex part 16B Rotation suppression part 16C Internal gear part 16D Bearing part 17 Motor 18 Frame 19 Cylindrical Shaped member 20 Rotating shaft 21 Sun gear 22 Restriction member 23 Bearing 24 Rotating knob 25 Print sheet 26 Power supply line 31 Base frame 32 Mounting plate 33 Print head 34 Press spring

 ──────────────────────────────────────────────────の 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) 3F049 AA10 CA32 LA07 LB03

Claims (5)

[Claims] A cylindrical conveying roller having a rotating internal gear formed on an inner periphery thereof; a motor having a sun gear fixed to a rotating shaft; a fixed internal gear having a different number of teeth from the rotating internal gear; The sun gear, the planetary gear meshing with the rotating internal gear and the fixed internal gear, and one end of the cylindrical transport roller are rotatably supported, and the motor is fixed coaxially with the cylindrical transport roller. Printer drive device composed of frames. 2. The printer driving device according to claim 1, further comprising an elastic member that presses the fixed internal gear with a force greater than a driving force of the rotating internal gear on the inner periphery of the cylindrical transport roller and regulates the rotation. 3. The printer driving device according to claim 1, wherein the solid internal gear is formed of an oil-impregnated sintered body. 4. The printer driving device according to claim 1, wherein an inner circumference of the fixed internal gear other than the internal gear is supported by an outer circumference of a cylindrical member penetrating the frame. 5. The printer driving device according to claim 1, wherein the cylindrical conveying roller is a two-stage throttle tube having a large diameter and a small diameter, and the small diameter portion is supported by a frame.