JP2001208161A - Planetary mechanism and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planetary mechanism and a recording device free from the failure in oscillation of a planetary lever and a planetary gear, and capable of surely converting the forward and backward rotations of a sun gear into the rotation in the predetermined uniform direction. SOLUTION: In this planetary mechanism where one end of a planetary lever 82 is connected to a sun gear shaft of a forwardly and backwardly rotatable sun gear 80, the other end of the planetary lever is connected to a planetary gear shaft of a planetary gear 83 engaged with the sun gear 80, the planetary gear 83 is oscillated integrally with the planetary lever 82 about the sun gear shaft, when the forward or backward rotation of the sun gear 80 is switched, and the engagement of the planetary gear is switched to a first gear 85 or a second gear 86, the planetary gear 83 and the planetary lever 82 are superposed through a flat seat 89, and a compression spring 122 of a small spring constant is mounted outside of the planetary lever 82 for giving the load torque between the planetary lever 82 and the planetary gear 83.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction comprising a sun gear rotatable in forward and reverse directions, a planetary lever and a planetary gear, wherein the output of the sun gear rotating in forward and reverse directions is converted into rotation in the same direction and output. The present invention relates to a planetary mechanism and a recording device having the same.

[0002]

2. Description of the Related Art FIG. 8 is a view showing a conventional planetary mechanism, and FIG. 9 is a sectional view of a sun gear, a planetary lever and a planetary gear. FIG.
In FIG. 9 and FIG. 9, reference numeral 100 denotes a sun gear that can rotate forward and backward. One end 102a of a planetary lever 102 is connected to a sun gear shaft 101 of the sun gear 100, and the other end 102b of the planetary lever 102 is connected to a planetary gear shaft 104 of a planetary gear 103 meshing with the sun gear 100.

[0003] Further, as shown in FIG.
A pair of flat seats 109 and 110 are provided between the pair of flat seats 109 and 110, and a disc spring 11 is provided between the pair of flat seats 109 and 110.
1 and the disc spring 111 is connected to the planetary lever 102.
And a predetermined load torque between the planetary gear 103.

Since the load torque is present, referring to FIG. 8, when the sun gear 100 switches between forward rotation and reverse rotation, the planetary gear 103 swings integrally with the planetary lever 102 about the sun gear shaft 101. The meshing of the planetary gear 103 is switched to either the first gear 105 or the second gear 106. When the engagement of the planetary gear 103 is switched to the first gear 105, the rotation is transmitted to the ratchet 108 via the third gear 107, and when the engagement is switched to the second gear 106, the rotation is transmitted directly to the ratchet 108.

Therefore, regardless of whether the sun gear 100 rotates forward or backward, the output of the ratchet 108 as the final output is converted into a predetermined rotation in the same direction by the interposition of the third gear 107 and the output. Is done.

[0006]

However, in the conventional configuration, referring to FIG. 9, since a disc spring 111 is interposed between the planetary lever 102 and the planetary gear 103, the disc spring 111 wears or If there is a large variation in the component size of the spring 111, the planetary gear 103 is inclined, and the engagement between the planetary gear 103 and the sun gear 100 becomes incomplete. In addition, since the disc spring 111 has a large spring constant, if the disc spring 111 wears, the load torque described above becomes unstable, and the planetary lever 102 swings poorly, and the output of the ratchet 108 becomes unstable. , Etc.

A recording apparatus such as a dot impact printer has a carriage driving pulley connected to a carriage driving motor driven in forward and reverse rotations, and a carriage driven pulley connected to the pulley via a belt. ,
When the output of the carriage driven pulley is obtained and the carriage driven pulley rotates in either the forward direction or the reverse direction, the rotation is converted into a predetermined rotation in the same direction, and the rotational force is applied to the ink ribbon. It has a planetary mechanism for the ribbon drive shaft.

[0008] When the above-mentioned configuration is adopted in this planetary mechanism,
For example, a swing failure of the planetary lever 102 and the planetary gear 103 occurs, and the feeding of the ribbon drive shaft of the ink ribbon becomes unstable, and there is a possibility that the print quality may be deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a planetary mechanism and a recording apparatus in which forward and reverse rotations of a sun gear are reliably converted into rotations in a predetermined same direction without causing a swing failure of a planetary lever and a planetary gear. Is to provide.

[0010]

According to the first aspect of the present invention, a planetary gear is connected to a sun gear via a planetary lever,
In a planetary mechanism having a configuration for applying a load torque between the planetary gear and the planetary lever, the planetary gear and the planetary lever are folded over a flat seat, and the load torque is applied by a compression spring having a small spring constant. It is characterized by having comprised.

According to a second aspect of the present invention, one end of a planetary lever is connected to a sun gear shaft of a sun gear that is rotatable forward and backward, and the other end of the planetary lever meshes with the sun gear. When connected to the gear shaft and the sun gear switches to forward or reverse rotation, the planetary gear swings integrally with the planetary lever around the sun gear shaft, and the meshing of this planetary gear is either the first gear or the second gear. In a planetary mechanism having a configuration for switching between crabs, a spring constant for folding the planetary gear and the planetary lever via a flat seat and applying a load torque between the planetary lever and the planetary gear outside the planetary lever. Characterized in that a compression spring having a small size is provided.

According to a third aspect of the present invention, in a planetary mechanism having a configuration in which a planetary gear is connected to a sun gear via a planetary lever and a load torque is applied between the sun gear and the planetary lever, The invention is characterized in that the planetary lever and the planetary lever are laid on each other via a flat seat, and the load torque is applied by a compression spring having a small spring constant.

According to a fourth aspect of the present invention, one end of a planetary lever is connected to a sun gear shaft of a sun gear rotatably and reversely rotatable, and the other end of the planetary lever meshes with the sun gear. When connected to the gear shaft and the sun gear switches to forward or reverse rotation, the planetary gear swings integrally with the planetary lever around the sun gear shaft, and the meshing of this planetary gear is either the first gear or the second gear. In a planetary mechanism having a configuration for switching between crabs, a spring constant for folding the sun gear and the planetary lever via a flat seat and applying a load torque between the planetary lever and the sun gear outside the planetary lever. Characterized in that a compression spring having a small size is provided.

According to a fifth aspect of the present invention, there is provided a carriage driving pulley connected to a carriage driving motor driven in forward and reverse rotations, and a carriage driven pulley connected to the pulley via a belt. When the output of the pulley is obtained and the carriage driven pulley rotates in either the forward or reverse direction, the rotation is converted into a predetermined rotation in the same direction, and the rotational force is converted to the ribbon drive shaft of the ink ribbon. In a recording apparatus having a planetary mechanism, the planetary mechanism has a forward-reverse rotatable sun gear connected to a carriage driven pulley, and one end of a planetary lever connected to a sun gear shaft of the sun gear. The other end of this planetary lever is connected to the planetary gear shaft of the planetary gear that meshes with the sun gear, and when the sun gear switches to forward or reverse rotation, the planetary gear rotates around the sun gear axis. The planetary gear swings integrally with the bar, and the meshing of the planetary gear is switched to either the first gear or the second gear, and even if the meshing is switched to either, the ratchet meshes with the first gear or the second gear. Are rotated in a predetermined same direction, and the rotational force is applied to the ribbon drive shaft of the ink ribbon.Furthermore, the planetary gear and the planetary lever are laid on each other via a flat seat, and the outside of the planetary lever is Provided with a compression spring having a small spring constant for applying a load torque between the planetary lever and the planetary gear,
It is characterized by the following.

According to a sixth aspect of the present invention, there is provided a carriage driving pulley connected to a carriage driving motor driven in forward and reverse rotations, and a carriage driven pulley connected to the pulley via a belt. When the output of the pulley is obtained and the carriage driven pulley rotates in either the forward or reverse direction, the rotation is converted into a predetermined rotation in the same direction, and the rotational force is converted to the ribbon drive shaft of the ink ribbon. In a recording apparatus having a planetary mechanism, the planetary mechanism has a forward-reverse rotatable sun gear connected to a carriage driven pulley, and one end of a planetary lever connected to a sun gear shaft of the sun gear. The other end of this planetary lever is connected to the planetary gear shaft of the planetary gear that meshes with the sun gear, and when the sun gear switches to forward or reverse rotation, the planetary gear rotates around the sun gear axis. The planetary gear swings integrally with the bar, and the meshing of the planetary gear is switched to either the first gear or the second gear, and even if the meshing is switched to either, the ratchet meshes with the first gear or the second gear. Has a configuration in which the rotating force is applied to the ribbon drive shaft of the ink ribbon, and the sun gear and the planetary lever are laid over a flat seat, and the outer side of the planetary lever is rotated. Provided with a compression spring having a small spring constant for giving a load torque between the planetary lever and the sun gear,
It is characterized by the following.

[0016]

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

FIG. 1 is a perspective view showing a printer main body of the dot impact printer, FIG. 2 is a plan view showing the printer main body of FIG. 1, and FIG. 3 is a right side view showing the printer main body of FIG. In each of the drawings, reference numeral 10 denotes a dot impact printer. The printer 10 includes a printer main body 11 as a recording apparatus main body and a printer main body 11.
Push tractor unit 12 detachably attached to
And a discharge unit 13, and an upper case and a lower case (not shown) that cover the upper part and the lower part of the printer main body 11, respectively.

This printer 10 is, as shown in FIG.
An image including characters is printed by printing a dot by hitting a large number of needle pins (not shown) on the sheet S via the ink ribbon 50.

The printer body 11 includes a base frame 14 as a body frame, a sheet guide frame 15
(FIG. 4), a printing mechanism unit 20 including a left side frame 16 and a right side frame 17, a recording head 18 and a carriage 19, and a sheet conveying mechanism including a platen 21, a sheet guide 22, and a pinch roller 51 (FIG. 4). Part 23
, And is configured.

As shown in FIG. 3, the base frame 14 and the seat guide frame 15 are arranged substantially in parallel, and the left side frame 16 and the right side frame 1 are provided at both ends of the base frame 14 and the sheet guide frame 15, respectively.
7 are respectively erected and fixed. As shown in FIG. 1, a carriage guide 24 is bridged between the left side frame 16 and the right side frame 17 and is rotatably supported, and a platen 21 is bridged and rotatably disposed. , A sheet guide 22 is bridged and fixed. A tractor unit mounting section and a discharge unit mounting section (not shown), to which the push tractor unit 12 and the discharge unit 13 can be mounted, respectively, are provided on the rear and upper parts of the left side frame 16 and the right side frame 17, respectively. (Shown).

The push tractor unit 12 shown in FIG.
Sends out the continuous paper as the sheet S to the sheet transport mechanism 23, and the discharge unit 13 pulls out the continuous paper from the sheet transport mechanism 23 to the outside of the printer 10. As shown in FIG. 2, the push tractor unit 12 includes one tractor drive shaft 26 and one tractor guide shaft 27.
And a pair of symmetric tractors 28A and 28B and a pair of symmetric tractor frames 29A and 29B.

A pair of tractor frames 29A and 29B are fixedly supported at both ends of the tractor guide shaft 27. The tractor drive shaft 26 is rotatably supported at both ends by a pair of tractor frames 29A and 29B.

A tractor drive gear 30 (FIG. 3) is rotatably fixed to at least one end of the tractor drive shaft 26. Also, the tractors 28A and 28B
A tractor driven pulley (not shown) rotatably supported on the tractor guide shaft 27 and slidably in the axial direction, and a tractor drive pulley (not shown) rotatably integrated on the tractor drive shaft 26 and slidably supported in the axial direction. (Not shown) and tractor belt 3
3 is wound around and includes a sheet holding lid 34.

The distance between the pair of tractors 28A and 28B can be adjusted according to the width of the continuous paper to be conveyed. Also, a plurality of pins 35 protruding from the entire outer periphery of the tractor belt 33 can be engaged with holes (not shown) formed on both sides in the width direction of the continuous paper. Reference numeral 36 denotes a sheet support that is fitted to at least one of the tractor drive shaft 26 and the tractor guide shaft 27 to support the continuous paper.

As shown in FIG. 4, the discharge unit 13 includes a discharge roller 3 provided integrally with a roller shaft 31 so as to rotate.
The sheet S recorded by the recording head 18 is discharged to the outside of the printer 10 by the rotation of the discharge roller 32. Further, a discharge gear 40 (FIG. 3) is rotatably fixed to one end of the roller shaft 31.

As shown in FIG. 1, the left side frame 16
A sheet conveying motor 37 and a gear train section 38 as a power transmission system are installed on one of the right side frame 17 and the right side frame 17, for example. As shown in FIG. 3, the gear train portion 38 includes a motor pinion 39,
It comprises a first reduction gear 41, a second reduction gear 42, a platen drive gear 43, a transmission gear 44, the tractor drive gear 30 and the discharge gear 40.

The motor pinion 39 is fixed to the rotating shaft of the sheet conveying motor 37 so as to rotate integrally therewith. The driving force of the motor pinion 39 is transmitted to the platen driving gear 43 via the first reduction gear 41 and the second reduction gear 42, and the platen 21 is rotated in the direction of arrow A. Further, the driving force of the motor pinion 39 is changed to the first reduction gear 41 and the second reduction gear 42.
The tractor drive pulley of the push tractor unit 12 rotates in the direction of arrow B through the transmission gear 44, and the tractor belt 33 of the push tractor unit 12 moves in the same direction (direction of arrow B).
To rotate. Further, the driving force of the motor pinion 39 is
It is transmitted to the discharge gear 40 via the reduction gear 41, the second reduction gear 42, and the platen drive gear 43, and the discharge unit 1
The third discharge roller 32 rotates in the direction of arrow C as shown in FIG.

The rotation of the tractor belt 33 of the push tractor unit 12 causes the continuous paper to be guided by the sheet guide 22 of the sheet transport mechanism 23 by the action of the pins 35 of the tractor belt 33, and the sheet guide 22 and the platen 21. The sheet is fed in the direction of arrow D toward the platen 21 via a sheet conveying path 52 formed between the sheet feeding path 52 and the sheet feeding path 52. Further, as the discharge roller 32 of the discharge unit 13 rotates, the continuous paper on which characters and the like are recorded by the recording head 18 as described later is pulled out from the platen 21 of the sheet transport mechanism 23 in the direction of arrow E. Thereby, the continuous paper or cut sheet is conveyed in the sub-scanning direction orthogonal to the main scanning direction of the carriage 19 described later.

By operating the release lever 46 shown in FIG. 3, the transmission gear 44 is configured to mesh with or be disengaged from the tractor drive gear 30 of the push tractor unit 12. When the transmission gear 44 is engaged with the tractor drive gear 30 by operating the release lever 46,
By the action of the cam 54 formed on the release shaft 53 shown in FIG. 4, the pinch roller 51 of the sheet transport mechanism 23 separates from the platen 21, and the continuous paper as the sheet S is supplied to the platen 21 and transported as described above. Is done. When the transmission gear 44 is disengaged from the tractor drive gear 30 by operating the release lever 46, the pinch roller 51 of the sheet conveying mechanism 23 contacts the platen 21 and rotates by the action of the cam 54, and is not shown. From the sheet supply guide, a cut sheet as the sheet S is transferred to the sheet transport mechanism 2.
The sheet is supplied to and conveyed to the platen 21 via the third sheet conveying path 52.

The carriage 19 shown in FIG. 1 is slidably inserted into a carriage guide 24 and has a recording head 18 mounted thereon. Since the carriage guide 24 is arranged in parallel with the platen 21, the carriage 19
The platen 21 and the carriage guide 24 are provided so as to be movable (scanned) in the main scanning direction coinciding with the axial direction. The carriage 19 has a carriage drive motor 55
The scanning is performed by a carriage driving system including the timing belt 56 (FIG. 3) and the timing belt 56 (FIG. 4). The carriage drive motor 55 is fixed to the base frame 14, and a carriage drive pulley (not shown) is attached to the carriage drive motor 55 so as to rotate integrally therewith. Also, as shown in FIG.
A pulley support 47 is provided integrally with the base frame 14 at the lower end of the front portion of the left side frame 16, and a carriage driven pulley (not shown) is supported on the pulley support 47. A timing belt 56 is wound around the carriage driving pulley and the carriage driven pulley.
9 are combined.

Accordingly, the carriage 19 is guided by the carriage guide 24 via the timing belt 56 by the forward or reverse rotation of the carriage drive motor 55, and is scanned leftward or rightward in FIG. 1 in the main scanning direction.

The pulley support 47 has a ribbon drive shaft 4
8 are provided. The ribbon drive shaft 48 moves the ink ribbon 50 in the ribbon cassette 49 (FIG. 4) mounted on the left side frame 16 and the right side frame 17.

The ink ribbon 50 moves in front of the platen 21 along the axial direction of the platen 21.

The recording head 18 has a large number of needle pins (not shown), and an ink ribbon 50 is located in front of the needle pins in the protruding direction. The recording head 18
While scanning in the main scanning direction together with the carriage 19, the needle pins are projected to strike the ink ribbon 50, and the ink on the ink ribbon 50 is applied to the sheet S (continuous paper or cut sheet) in contact with the front peripheral surface of the platen 21. An image including characters is recorded on the sheet S by being attached.

The recording operation by the recording head 18 is such that one line of recording is performed by the needle pins of the recording head 18 while the carriage 19 scans leftward or rightward in the main scanning direction, and every time this one line of recording is performed. , Sheet S
Is a continuous sheet, the platen 21, the push tractor unit 12, and the discharge unit 13 of the sheet transport mechanism 23 are provided. If the sheet S is cut sheet, the platen 21, the sheet The supply guide and the discharge unit 13 convey the sheet S by a predetermined amount (normal line spacing), and the operation is repeated by repeating these operations.

Reference numeral 57 shown in FIG. 4 is formed between the base frame 14 and the sheet guide frame 15 so as to open, and the sheet transport mechanism 23 is located below the printer 10.
A bottom sheet supply port for supplying the sheet S into the inside.

By the way, in the printer 10 having the above configuration,
Carriage drive motor 55 driven forward and reverse (FIG. 3)
And a carriage driven pulley 200 (FIG. 5) connected to the pulley via a timing belt 56 (FIG. 4).

In this embodiment, the carriage driven pulley 2
00 (FIG. 5), regardless of whether the carriage driven pulley rotates in the forward or reverse direction, the rotation is converted to a predetermined rotation in the same direction, and the rotational force is converted to the ink ribbon. Planetary mechanism 7 applied to 50 ribbon drive shafts 48
9 (FIG. 5).

As shown in FIGS. 5 and 6, the planetary mechanism 79 has a resin-made sun gear 80 which is integrally connected to a carriage driven pulley 200 and is rotatable in normal and reverse directions.

As shown in FIG. 6, a sun gear shaft 81 with a metal flange 81a penetrates through the sun gear 80, and one end 82a of a resin-made planetary lever 82 is connected to the sun gear shaft 81. A ring member 120 is fixed to a tip 81b of the sun gear shaft 81 penetrating the one end 82a. There is almost no frictional force between the sun gear 80 and the planetary lever 82.

The other end 82b of the planetary lever 82 is connected to a metal planetary gear shaft 84 of a resin-made planetary gear 83 that meshes with the sun gear 80. This metal planetary gear shaft 8
4 has a collar 84a, the tip 84b of which passes through the planetary gear 83, the metal flat seat 89, and the other end 82b of the planetary lever 82, and a ring member 121 is fixed to the outer end of the tip 82b. ing.

That is, as shown in FIG. 6, a metal flat seat 89 is provided between a resin planetary lever 82 and a resin planetary gear 83.

Outside the planetary lever 82, a compression spring 122 having a small spring constant is provided between the planetary lever 82 and the planetary gear 83 to apply a frictional force (load torque).

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG.

When the carriage driven pulley 200 is rotating forward, the sun gear 80 integrally connected thereto is also rotating forward. In this case, the rotation of the sun gear 80 is transmitted to the planetary gear 83 as shown by the solid arrow in FIG.
Is transmitted to At this time, the second gear 86 is not engaged and does not rotate.

The rotational force of the ratchet 88 is applied to the ribbon drive shaft 48 of the ink ribbon 50 integrally connected thereto.
Accordingly, the ink ribbon 50 is rotated in a predetermined direction (arrow W).

When the carriage driven pulley 200 changes from forward rotation to reverse rotation, that is, when the scanning direction of the carriage 19 changes, the rotation of the sun gear 80 is transmitted to the planetary gear 83 as shown by a dotted arrow in FIG. Is done. The rotation direction of the planetary gear 83 at this time is counterclockwise in FIG. The torque of the planet gear 83 is transmitted to the planet lever 82 via the load torque, and the planet lever 82 swings counterclockwise about the sun gear shaft 81.

Then, the planetary gear 83 swings around the sun gear shaft 81 integrally with the planetary lever 82, and the planetary gear 8
3, as shown by the dotted line in FIG.
5 switches to the second gear 86.

The meshing of the planet gears 83 causes the second gear 86
5, the rotation of the sun gear 80 is transmitted to the planetary gear 83, as shown by the dotted line in FIG. 5, and then transmitted directly to the ratchet 88 via the second gear 86.
At this time, the first gear 85 is not engaged and does not rotate.

The rotation transmission path at this time has one less number of gears (the third gear 87) than the path shown by the solid line in FIG.
There is no. 5), the rotational direction of the ratchet 88 is the same as the direction following the path indicated by the solid line in FIG. 5 (arrow W).

Therefore, regardless of whether the sun gear 80 is rotating forward or reverse, the output of the ratchet 88 as the final output is converted into rotation in a predetermined same direction by the interposition of the third gear 87. Is output.

The rotational force of the ratchet 88 is applied to the ribbon drive shaft 48 of the ink ribbon 50 integrally connected thereto.
, Whereby the ink ribbon 50 is rotated in a predetermined direction.

In the present embodiment, a flat seat 89 is provided between the planetary lever 82 and the planetary gear 83, and no coned disc spring is located here as in the prior art.

Therefore, since the planetary lever 82 and the planetary gear 83 are always uniformly pressed into contact with each other, the planetary gear is caused by abrasion of the coned disc spring and variations in the dimensions of the coned disc spring as in the prior art. The inclination of the planet gear 83 does not occur, and the complete engagement between the planetary gear 83 and the sun gear 80 is maintained.

Further, since a compression spring 122 having a small spring constant is provided outside the planetary lever 82 between the planetary lever 82 and the planetary gear 83 to apply a load torque, it is assumed that the planetary lever 82 is made of resin. Even if the entire length of the compression spring 122 is increased due to wear of the gears or the planetary gears 83 and the like, the load torque described above does not suddenly weaken, and the load torque that is almost unchanged from the setting time is maintained.

Therefore, since the swinging of the planetary lever 82 is reliably performed, the feeding of the ribbon drive shaft 48 of the ink ribbon 50 is stabilized, and the printing quality can be improved.

FIG. 7 shows another embodiment.

In this embodiment, the sun gear 80 and the planetary lever 82 are laid on each other via the flat seat 125, and the planetary lever 8 is
2, a compression spring 126 having a small spring constant for applying a load torque between the planetary lever 82 and the sun gear 80.
Is provided. Other configurations are substantially the same as those of the above embodiment.

Also in this case, the flat seat 125 is provided between the planetary lever 82 and the sun gear 80, and since the disc spring is not located here, the space between the planetary lever 82 and the sun gear 80 is constantly and uniformly pressed. The sun gear 80 does not tilt due to wear of the spring or variation in the component dimensions of the disc spring, and the planetary gear 83 and the sun gear 8 do not tilt.
Zero complete engagement is maintained.

In order to apply a load torque between the planetary lever 82 and the sun gear 80 outside the planetary lever 82,
Since the compression spring 126 having a small spring constant is provided, even if the planetary lever 82 and the sun gear 80 made of resin are worn out and the total length of the compression spring 126 is increased, the above-described load torque is reduced. Without sudden weakening,
The load torque, which hardly changes from the setting, is maintained.

Therefore, since the swinging of the planetary lever 82 is reliably performed, the feeding of the ribbon drive shaft 48 of the ink ribbon 50 is stabilized, and the printing quality can be improved.

Although the present invention has been described based on the above embodiment, the present invention is not limited to this.

[0063]

As described above, according to the present invention, a flat seat is provided between the planetary lever and the planetary gear, or between the planetary lever and the sun gear, and there is no disk spring as in the prior art. Since the pressure between the planetary lever and the planetary gears or between the planetary lever and the sun gear is always uniformly pressed, the coned disk spring is worn as before, or the component dimensions of the conical disk spring are varied. No inclination of the planetary gear or the sun gear occurs, and perfect engagement between the planetary gear and the sun gear is maintained.

Further, a compression spring having a small spring constant is provided outside the planetary lever between the planetary lever and the planetary gear or between the planetary lever and the sun gear, so that a compression spring having a small spring constant is provided. Even if wear occurs on the planetary levers, planetary gears, etc., and the overall length of the compression spring becomes longer, the above-described load torque does not suddenly weaken,
The load torque, which hardly changes from the setting, is maintained.

Therefore, if the target is a recording device, the swinging of the planetary lever is reliably performed, so that the feed of the ribbon drive shaft of the ink ribbon is stabilized and the printing quality can be improved. Play.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a printer main body of a dot impact printer.

FIG. 2 is a plan view showing the printer main body of FIG.

FIG. 3 is a right side view showing the printer main body of FIG. 1;

FIG. 4 is a side sectional view showing the printer main body of FIG. 1;

FIG. 5 is a view showing one embodiment of a planetary mechanism according to the present invention.

FIG. 6 is a sectional view of a sun gear, a planetary lever, and a planetary gear.

FIG. 7 is a diagram corresponding to FIG. 6, showing another embodiment.

FIG. 8 is a view showing a conventional planetary mechanism.

FIG. 9 is a sectional view of a conventional sun gear, planetary lever, and planetary gear.

[Explanation of symbols]

 Reference Signs List 10 printer (recording device) 19 carriage 48 ribbon drive shaft 50 ink ribbon 55 carriage drive motor 79 planetary mechanism 80 sun gear 81 sun gear shaft 82 planetary lever 83 planetary gear 85 first gear 86 second gear 87 third gear 88 ratchet 89 Flat seat 122, 126 Compression spring 125 Flat seat

Claims (6)

[Claims] 1. A planetary mechanism having a configuration in which a planetary gear is connected to a sun gear via a planetary lever, and a load torque is applied between the planetary gear and the planetary lever, wherein the planetary gear and the planetary lever are placed in a flat seat. And a compression spring having a small spring constant to apply the load torque. 2. One end of a planetary lever is connected to a sun gear shaft of a sun gear configured to be freely rotatable forward and backward, and the other end of the planetary lever is connected to a planetary gear shaft of a planetary gear meshing with the sun gear. When the gear is switched to forward or reverse rotation, the planetary gear swings integrally with the planetary lever around the sun gear axis, and the meshing of this planetary gear has a configuration that switches to either the first gear or the second gear. In the planetary mechanism, the planetary gear and the planetary lever are folded over a flat seat, and a compression spring having a small spring constant for applying a load torque between the planetary lever and the planetary gear is provided outside the planetary lever. A planetary mechanism characterized by that. 3. A planetary mechanism having a configuration in which a planetary gear is connected to a sun gear via a planetary lever and a load torque is applied between the sun gear and the planetary lever, wherein the sun gear and the planetary lever are placed in a flat seat. And a compression spring having a small spring constant to apply the load torque. 4. One end of a planetary lever is connected to a sun gear shaft of a sun gear configured to be freely rotatable forward and backward, and the other end of the planetary lever is connected to a planetary gear shaft of a planetary gear meshing with the sun gear. When the gear is switched to forward or reverse rotation, the planetary gear swings integrally with the planetary lever around the sun gear axis, and the meshing of this planetary gear has a configuration that switches to either the first gear or the second gear. In the planetary mechanism, the sun gear and the planetary lever are laid on each other via a flat seat, and a compression spring having a small spring constant for providing a load torque between the planetary lever and the sun gear is provided outside the planetary lever. A planetary mechanism characterized by that. 5. A carriage driving pulley connected to a carriage driving motor driven in forward and reverse rotation, and a carriage driven pulley connected to the pulley via a belt, and an output of the carriage driven pulley is obtained. Even if the carriage driven pulley rotates in either the forward or reverse direction, it has a planetary mechanism that converts the rotation into a predetermined rotation in the same direction and applies the rotational force to the ribbon drive shaft of the ink ribbon. In this recording apparatus, the planetary mechanism has a forward / reverse rotatable sun gear connected to a carriage driven pulley, one end of a planetary lever connected to a sun gear shaft of the sun gear, and the other end of the planetary lever. Is connected to the planetary gear shaft of the planetary gear that meshes with the sun gear, and when the sun gear switches to forward or reverse rotation, the planetary gear is integrated with the planetary lever around the sun gear axis. When the car swings, the meshing of the planetary gears is switched to either the first gear or the second gear, and even if the meshing is switched to either, the ratchet meshing with the first gear or the second gear is in the same direction in a predetermined direction. And the rotational force is given to the ribbon drive shaft of the ink ribbon.Furthermore, the planetary gear and the planetary lever are folded over a flat seat, and the planetary lever and the planetary lever are arranged outside the planetary lever. A recording device, comprising: a compression spring having a small spring constant for applying a load torque between planetary gears. 6. A carriage driving pulley connected to a carriage driving motor driven in forward and reverse rotation, and a carriage driven pulley connected to the pulley via a belt, and an output of the carriage driven pulley is obtained. Even if the carriage driven pulley rotates in either the forward or reverse direction, it has a planetary mechanism that converts the rotation into a predetermined rotation in the same direction and applies the rotational force to the ribbon drive shaft of the ink ribbon. In this recording apparatus, the planetary mechanism has a forward / reverse rotatable sun gear connected to a carriage driven pulley, one end of a planetary lever connected to a sun gear shaft of the sun gear, and the other end of the planetary lever. Is connected to the planetary gear shaft of the planetary gear that meshes with the sun gear, and when the sun gear switches to forward or reverse rotation, the planetary gear is integrated with the planetary lever around the sun gear axis. When the car swings, the meshing of the planetary gears is switched to either the first gear or the second gear, and even if the meshing is switched to either, the ratchet meshing with the first gear or the second gear is in the same direction in a predetermined direction. And the rotational force is given to the ribbon drive shaft of the ink ribbon.Furthermore, the sun gear and the planetary lever are folded over a flat seat, and the planetary lever and the planetary lever are arranged outside the planetary lever. A recording device comprising a compression spring having a small spring constant for applying a load torque between sun gears.