JP2001232877A - Recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording apparatus reduced in production cost and enhanced in the degree of freedom of assembling. SOLUTION: The recording apparatus is equipped with the input gear 152 provided outside a side frame 17 to be operated in connection with the operation of a release lever 46, and the transmission gear 153 connected to the release shaft 53 extending inside the side frame and led out of the side frame through the bearing hole of the side frame to be meshed with the input gear 152. The apparatus is constituted so as to revolve the release shaft 53 through the gears 152, 153 in connection with the operation of the release lever 46 to make the follower roller constituting a paper feed structure come into contact with and separate from a platen freely. The release shaft 53 and the transmission gear 153 are integrally formed through a bearing part 157 having a diameter larger than that of the transmission gear 153, and the bearing part 157 is supported in a freely rotatable manner by the bearing hole 156 of the side frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus having a structure in which the distance between a platen and a driven roller can be changed according to the operation of a release lever.

[0002]

2. Description of the Related Art In a conventional platen winding type recording apparatus, the paper feeding structure is such that a driven roller attached to a driven roller holder is configured to be able to freely move toward and away from a platen so that the same paper path is provided. Thus, the two types of paper feed, the cut sheet and the continuous sheet, are compatible. In this paper feed structure, generally, an input gear provided outside the side frame and operated in conjunction with the operation of the release lever is connected to a release shaft extending inside the side frame. A transmission gear that is led out of the frame through the hole and meshes with the input gear, and interlocks with the operation of the release lever to rotate the release shaft via each gear, thereby allowing the driven roller and The platen is separated from the platen.

FIG. 11 shows a conventional structure.

In this structure, an input gear 102 is provided which rotates in response to the operation of a release lever 101, and a transmission gear 104 meshing with the input gear 102 outside the side frame 103 is provided. This transmission gear 10
4 has a bearing portion 105 integrally therewith.
5 penetrates through the bearing hole 106 of the side frame 103,
Release shaft 107 extending inside the frame 103
Of the shaft. And the release lever 10
In response to the operation 1, the release shaft 107 is rotated via the gears 102 and 104, and a driven roller constituting a paper feeding structure (not shown) is configured to be able to freely contact and separate from the platen.

[0005]

However, in the conventional configuration, since the release shaft 107 and the transmission gear 104 are separate structures, two parts are required, and the manufacturing cost including parts management increases. In addition, there is a problem that the assembly becomes difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording apparatus which solves the problems of the prior art, reduces manufacturing costs, and improves the degree of freedom in assembly.

[0007]

According to the first aspect of the present invention,
An input gear provided outside the side frame and operated in conjunction with the operation of the release lever, and connected to a release shaft extending inside the side frame and led out of the frame through a bearing hole in the side frame. And a transmission gear that meshes with the input gear, and in conjunction with the operation of the release lever, rotates a release shaft via each gear to freely move a driven roller that constitutes a paper feed structure to and away from a platen. In the recording apparatus, the release shaft and the transmission gear are integrally formed via a bearing portion having a diameter larger than the diameter of the transmission gear, and a bearing hole of the side frame is rotatable about the bearing portion. The structure is characterized in that it has a configuration to support it.

According to a second aspect of the present invention, in the first aspect, an integrated structure of a release shaft and the transmission gear is obliquely inserted from the inside of the side frame, and is inserted through a bearing hole of the side frame. The transmission gear is configured to be able to be led out of the frame.

According to a third aspect of the present invention, in the second aspect, the outer peripheral shape of the bearing portion is formed in a substantially arc shape so that the bearing portion can be obliquely inserted into the bearing hole of the side frame. It is characterized by the following.

According to a fourth aspect of the present invention, in the second aspect, the bearing hole of the side frame supports one half of the circumference of the bearing portion, and the other half circumference supports the other half of the bearing portion. And a support, and each support is displaced in the axial direction of the bearing portion.

[0011]

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 transport mechanism including a platen 21, a sheet guide 22, and a driven roller 51 (FIG. 4). Part 23,
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
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 for rotation.
2 is provided.

By the rotation of the discharge roller 32, the sheet S recorded by the recording head 18 is discharged out of the printer 10. 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, 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 a transmission. Gear 40A and discharge gear 4
0.

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
Reduction gear 41, second reduction gear 42, platen drive gear 4
3 and transmitted to the discharge gear 40 via the transmission gear 40A, and the discharge roller 32 of the discharge unit 13 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. 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 be able 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,
As will be described later, the operation of the cam 54 formed on the release shaft 53 shown in FIG. 4 causes the driven roller 51 of the sheet conveying mechanism 23 to separate from the platen 21 and to continuously feed the sheet S to the platen 21 as described above. Paper is supplied and transported. When the transmission gear 44 is disengaged from the tractor drive gear 30 by operating the release lever 46, the driven roller 51 of the sheet conveying mechanism 23 contacts the platen 21 and rotates due to the action of the cam 54, which is not shown. From the sheet supply guide, a cut sheet as a sheet S is passed through the sheet transport path 52 of the sheet transport mechanism 23 to the platen 2.
1 and transported.

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 direction in which they protrude. 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 row 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. If S is continuous paper,
The platen 21, the push tractor unit 12, and the discharge unit 13 of the sheet transport mechanism 23, and the platen 21, the driven roller 51, and the discharge unit 13 of the sheet transport mechanism 23 when the sheet S is cut sheet. Each of the sheets S is conveyed by a predetermined amount (usually between lines), and these operations are repeated to carry out the operation.

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

FIG. 5 is an assembled perspective view showing the left side frame 16, right side frame 17, and seat guide 22.
FIG. 6 is a side view as viewed from the right side frame 17 side in FIG. 5, and FIG. 7 is a cross-sectional view along AA in FIG.

On the outside of the right side frame 17, the release shaft 5 described above is interlocked with the operation of the release lever 46.
3 (FIG. 4) is provided.
As shown in FIG. 6, the mechanism 150 includes a plate 151 integrally connected to the release lever 46, an input gear 152 formed on the plate 151, and a transmission gear 153 that meshes with the input gear 152. The transmission gear 153 is integrally connected to the release shaft 53 as shown in FIG.

When the release lever 46 is moved in the direction of the arrow in FIG. 6, the input gear 152 operates in conjunction therewith, the transmission gear 153 meshing with the input gear 152 rotates, and the release shaft integrally connected thereto is rotated. 53 rotates.

The release shaft 53 penetrates the hole 154a of the driven roller holder 154, as shown in FIG. As shown in FIG. 5, the driven roller holder 154 faces an opening 22a formed in the sheet guide 22, and the driven roller 51 is provided on an upper surface thereof. As shown in FIG. 4, a spring 155 is in contact with the lower surface of the driven roller holder 154.
Always urge the driven roller holder 154 upward.

A cam 54 is integrally formed on the release shaft 53. The cam 54 is located in the hole 154a of the driven roller holder 154.

When the release shaft 53 is rotated to a position indicated by a solid line around the axis A, a cam 54 integrally formed therewith is formed.
Is driven roller holder 15 against the spring force of spring 155.
Press down 4. According to this, the driven roller 51 separates from the platen 21, and the continuous paper as the sheet S is supplied to the platen 21 and conveyed as described above. Further, when the release shaft 53 rotates around the axis A to the dotted line position, the cam 54 comes off, and the driven roller holder 154 is pushed up by the spring force of the spring 155. According to this, the driven roller 51 rotates in contact with the platen 21,
A cut sheet as a sheet S is supplied from a sheet supply guide (not shown) to the platen 21 via a sheet conveyance path 52 and is conveyed.

FIG. 8 is a perspective view showing the right side frame 17. The right side frame 17 has a bearing hole 1
56 are formed.

In the present embodiment, as shown in FIG. 7, the release shaft 53 and the transmission gear 153 are formed integrally via a bearing 157. The bearing portion 157 has a diameter d1 larger than a diameter d2 of the transmission gear 153, and has a bearing hole 1 formed in the right side frame 17.
56 rotatably supported. Although not shown, the other end of the release shaft 53 is rotatably supported by a bearing inside the left side frame 16.

FIG. 9 schematically shows the positional relationship between the bearing hole 156 and the bearing portion 157 shown in FIG.

As shown in FIGS. 8 and 9, the bearing hole 156 has a half-circumferential support 156a for supporting one half of the bearing 157, and another semi-circular support 156b for supporting the other half of the bearing 157. And each support 156a,
Reference numeral 156b is formed so as to be shifted by the dimension W1 in the axial direction of the bearing portion 157. The width dimension W2 of the bearing portion 157 is formed larger than this dimension W1.

According to this, each support 156a, 156
The maximum distance D (FIG. 9) connecting the corners of the b
7, the integral structure of the release shaft 53 and the transmission gear 153 is inserted obliquely from the inside of the right side frame 17 as indicated by a dotted line in FIG. The transmission gear 153 is led out of the frame 17 through the hole 156, and the transmission gear 153 can be engaged with the input gear 152 outside the transmission gear 153.

In the conventional configuration, since the release shaft 53 and the transmission gear 153 are separate bodies, two parts are required.
Although the manufacturing cost including the parts management has been increased, in the present embodiment, the above structure allows the integrated structure of the release shaft 53 and the transmission gear 153 to be incorporated as it is, and includes the parts management. The manufacturing cost can be reduced and the degree of freedom in assembly can be improved.

FIG. 10 shows another embodiment.

In the present embodiment, unlike the above-described embodiment, the right side frame 17 simply has the bearing hole 1 penetrating therethrough.
The outer peripheral shape of the bearing portion 162 rotatably supported by the bearing hole 161 is formed in a substantially arc shape so that the bearing portion 162 can be obliquely inserted into the bearing hole 161 of the right side frame 17. ing.

According to this, by inserting the integrated structure obliquely from the inside of the right side frame 17, the transmission gear 1 is inserted through the bearing hole 161 of the right side frame 17.
Since 53 can be led out of the right side frame 17,
Outside the frame 17, the transmission gear 153 is connected to the input gear 15
2 can be engaged.

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

[0049]

According to the present invention, the integrated structure of the release shaft and the transmission gear can be incorporated as it is.
It is possible to reduce the manufacturing cost including the parts management and to improve the degree of freedom of assembly.

[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 perspective view showing a state where a left side frame, a right side frame, and a seat guide are assembled.

FIG. 6 is a side view as viewed from a right side frame side in FIG. 5;

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is a perspective view showing a right side frame.

FIG. 9 is a diagram schematically showing a positional relationship between the bearing hole and the bearing shown in FIG. 7;

FIG. 10 is a diagram corresponding to FIG. 9, showing another embodiment.

FIG. 11 is a diagram corresponding to FIG. 9 showing a conventional configuration.

[Explanation of symbols]

 Reference Signs List 10 printer (recording device) 17 right side frame 46 release lever 53 release shaft 150 rotation mechanism 152 input gear 153 transmission gear 154 driven roller holder 155 spring 156 bearing hole 156a one half circumference support 156b other half circumference support 157 bearing part 161 bearing Hole 162 Bearing

Claims (4)

[Claims] An input gear provided outside the side frame and operating in conjunction with the operation of a release lever; and an input gear connected to a release shaft extending inside the side frame and through a bearing hole of the side frame. A transmission gear that is led out of the frame and meshes with the input gear, and interlocks with the operation of the release lever to rotate a release shaft via each gear to form a driven roller that constitutes a paper feeding structure. Wherein the release shaft and the transmission gear are integrally formed via a bearing portion having a diameter larger than the diameter of the transmission gear, and a bearing hole of the side frame is formed in the bearing portion. A recording device having a configuration for rotatably supporting the recording device. 2. An integrated structure of the release shaft and the transmission gear is inserted obliquely from the inside of the side frame, and the transmission gear can be led out of the frame through a bearing hole of the side frame. The recording apparatus according to claim 1, wherein: 3. The recording apparatus according to claim 2, wherein an outer peripheral shape of the bearing portion is formed in a substantially arc shape so that the bearing portion can be inserted obliquely into a bearing hole of the side frame. 4. The bearing hole of the side frame is formed of one half-peripheral support for supporting one half of the bearing, and another half-peripheral support for supporting the other half of the bearing. 3. The recording apparatus according to claim 2, wherein the recording apparatus is displaced in the axial direction.