JP2002248531A - Caulking method, caulking structure, chassis, recording equipment and ink-jet recording equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise an allowable rotational torque in the caulking of a shaft to a sheet metal. SOLUTION: A shaft 1 is caulked to a sheet metal 4, because a part of difference in level 2 of the shaft 1, of which cross-section is round, is made to perform a plastic deformation into the approximately same form as a polygonal hole 7 which is formed in the sheet metal 4. A rotational torque loaded on the shaft 1 is received by both a frictional force on a face 6 which the shaft 1 contacts with the sheet metal 4 and the side 2a of each part of difference in level which the shaft 1 contacts face to face with the side 7a of each hole of the polygonal hole 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking method, a caulking structure, a recording apparatus, and an ink jet recording apparatus with an increased allowable rotational torque.

[0002]

2. Description of the Related Art Conventionally, caulking has been used as a method for joining a metal shaft and a sheet metal.

An example of the conventional caulking will be described below.

[0004] First, as shown in FIG. 10 (a) and FIG. 10 (b), the relative shaft 101 of diameter D _1, to form the stepped portion 102 of diameter D ₂ at its end. The length L of the stepped portion 102 is slightly (typically 0.2 to 0.5) smaller than the plate thickness t of the sheet metal 104 shown in FIG.
[Mm]). Furthermore the stepped portion diameter D ₃ on the end face of the _{102 = D 2 - (0.4 [} mm] ~1.0 [mm])
The center hole 103 of 90 degrees is formed.

On the other hand, at a position where the shaft 101 of the sheet metal 104 is joined, as shown in FIG. 11, a through-hole 105 having an inner diameter into which the step portion 102 having a diameter D ₂ of the shaft 101 fits without play is provided.

[0006] Next, as shown in FIG.
1 is made to bite into the sheet metal 104. Thereafter, FIG.
As shown in (1), the step portion 102 of the shaft 101 is plastically deformed, and the shaft 101 and the sheet metal 104 are fastened. At this time, the allowable rotational torque of the shaft 104 is such that the step portion 102 of the shaft is plastically deformed and the surface 106 pressed against the sheet metal 104 and the sheet metal 1
It is caused by the frictional force with 04.

In general, the above-described swaging of the metal shaft and the sheet metal is performed by an ink jet that directly prints a character or an image by discharging ink from a fine nozzle toward a recording medium (paper, cloth, plastic sheet, or the like). It is often used when constructing a chassis of an electric product including a recording device.

Conventionally, there has been known an ink jet recording apparatus using a head cartridge with an ink tank in which an ink jet recording head and an ink tank are integrated, or an ink jet cartridge in which the ink tank is further detachably attached to the cartridge. I have. This cartridge is of a disposable type which is fixedly supported by a carriage provided in the ink jet recording apparatus main body so as to be capable of reciprocating scanning, and is detachable from the carriage.

FIG. 13 to FIG. 16 show a carriage chassis of such an ink jet recording apparatus on which a carriage is mounted so as to be capable of reciprocating scanning.

The carriage chassis can be roughly classified into a vertical type shown in FIG. 13 and a horizontal type shown in FIGS. 14, 15 and 16.

A type in which a guide rail 204 is positioned above a guide shaft 203 which guides the reciprocating scanning of the carriage 202 is a so-called vertical type shown in FIG. Compact in the transport direction. However,
It tends to be large in the direction (upward) perpendicular to the recording paper transport direction.

On the other hand, FIG. 14 shows a so-called horizontal type in which a guide rail 304 is positioned on a recording medium discharge side with respect to a guide shaft 303 of a carriage 302. In the above configuration, the recording paper can be made compact in the direction (upward) perpendicular to the transport direction of the recording paper as the recording medium. However, it tends to be large in the recording paper conveyance direction.

The choice between the vertical type and the horizontal type depends on the configuration and features of the apparatus main body.

Here, a horizontal type will be described as a conventional example.

An ink jet recording head (not shown) is mounted on a carriage 302 slidable on a guide shaft 303 and a guide rail 304, and the carriage 302 is moved around a pulley 306 by a carriage motor 305 held on a carriage plate 315. This is performed by fixing a part of the timing belt 307 to the carriage 302, and reciprocating drive is performed by changing the rotation direction of the carriage motor 305.

The carriage plate 315 is fixed to the left side plate 318 and the right side plate 319 by screws, caulking, welding or the like. The guide shaft 303 is located on the left side plate 3
18, is held by the right side plate 319, but is not fastened, so it does not function as a member for ensuring the rigidity of the carriage chassis 320.

In the above configuration, the guide shaft 303
Of the guide shaft 303 by fixing one end a of the guide shaft 303 and making the other end b adjustable up and down (not shown).
And the guide rail 304 are adjusted in parallel. The guide rail 304 is fixed to the left plate 318 and the right plate 319 by caulking, screws, welding, or the like described above. Further, a stay 323 is fastened to the left side plate 318 and the right side plate 319 for reinforcement. The guide rail 304 and the stay 323 may be integrated to function as a member member for increasing the rigidity of the carriage chassis 320, but the surface of the guide rail 304
Is sliding, so that it is required that the flatness of the plane and the coefficient of friction be low. The carriage chassis 320 on which the carriage 302 is mounted is configured to be fixed on the main body chassis 316.

As shown in FIGS. 15 and 16, a recording paper 308 as a recording medium is set in a cassette 309, separated and conveyed one by one by a separation mechanism (not shown), and passed through a U-turn roller 310. The sheet reaches the LF roller 311 and is sent to a recording unit on the platen 312. Then, the ink is ejected from the ink jet recording head mounted on the carriage 302 and the ink is ejected from the ink jet recording head mounted on the carriage 302, so that the ink is recorded on the recording paper 308.

Thereafter, the recording paper 308 is discharged from the paper discharge rollers 31.
3, the paper is discharged onto the paper discharge tray 314.

[0020]

However, the permissible rotational torque caused by fixing the shaft and the sheet metal by caulking in the related art is only the frictional force between the surface of the shaft that is in contact with the sheet metal due to plastic deformation of the stepped portion of the shaft. . For this reason, although depending on the shaft diameter, usually, only an allowable rotation torque of about 4.9 [Ncm] to 9.8 [Ncm] was obtained. For this reason, a high allowable rotation torque may not be obtained in some cases.

Therefore, as a method of increasing the rotational torque between the shaft and the sheet metal, there is welding other than the caulking, but the cost is higher than the caulking, and the sheet metal is deformed by heat, and the accuracy may be reduced in some cases.

On the other hand, in the above-described carriage chassis 320 of the conventional ink jet recording apparatus, in order to increase the rigidity of the frame including the chassis plate 315, the left side plate 318, the right side plate 319, and the stay 323, it is necessary to use a lot of sheet metal. In some cases, the required sheet metal amount increases, leading to an increase in cost and weight.

In addition, although the guide shaft 303 is used, it does not contribute to the rigidity of the carriage chassis 320. Therefore, the required rigidity must be obtained by sheet metal, and the required amount of sheet metal increases. In some cases, the cost and weight increase.

Further, since the chassis plate 315 is formed of an integral sheet metal, it is difficult to obtain the accuracy of the parallelism between the guide shaft 303 and the guide rail 304. Therefore, the height direction of one end b of the guide shaft 303 is adjusted. I have.
Therefore, it took time to adjust.

Accordingly, it is a first object of the present invention to provide a method for caulking a shaft and a sheet metal with an increased allowable rotational torque and a caulking structure.

It is a second object of the present invention to provide a chassis, a recording apparatus, and an ink jet recording apparatus having increased rigidity.

[0027]

In order to achieve the above object, a swaging method according to the present invention is directed to a swaging method in which a shaft is fixed to a plate member by swaging, wherein a plurality of holes of the plate member into which the shaft is fitted are provided. The method includes a step of forming a square, and a step of plastically deforming a portion of the shaft fitted into the through-hole into substantially the same shape as the polygon.

In the caulking method of the present invention as described above, the hole of the plate member is formed in a polygonal shape, a shaft is fitted in the polygonal hole, and the fitted portion is substantially the same as the polygonal shape. The shaft is caulked and fixed to the plate member by plastically deforming it into a shape. For this reason, the shaft and the plate member not only have the frictional force of the contacting surface but also each side of the shaft which has been plastically deformed and has a substantially same shape as the polygonal hole has a polygonal hole. By hitting each side of the above, it is possible to form a caulking of a configuration for restricting the rotation of the shaft.

Further, the method includes a step of forming a point other than a straight line at a point where each side of the polygonal hole is in contact with the inscribed circle of the polygonal hole and a line connecting the vertices of the polygonal hole. In particular, the method may include a step of forming a line segment other than a straight line into a curve in which the center side of the inscribed circle is concave. If this line segment is formed into a curve in which the center side of the inscribed circle of the polygonal hole is concave,
The angles of the vertices can be made smaller than the vertices of the polygon. Thereby, the angle between the surface receiving the rotational torque applied to the shaft and the direction of the force of the rotational torque can be made close to perpendicular.

In the caulking structure according to the present invention, in the caulking structure in which the shaft is fixed to the plate member by caulking, the hole of the plate member formed into a polygon into which the shaft is fitted is inserted into the hole of the shaft. The portion fitted into the hole is plastically deformed and caulked to substantially the same shape as the polygon.

In the caulking structure of the present invention as described above, the shaft is plastically deformed into the polygonal hole of the plate member to have substantially the same shape as the polygon and caulked. For this reason, the shaft and the plate member not only have the frictional force of the contacting surface but also each side of the shaft which has been plastically deformed and has a substantially same shape as the polygonal hole has a polygonal hole. , The rotation of the shaft is restricted.

The caulking structure of the present invention is characterized in that a line connecting a point where each side of the polygonal hole is in contact with the inscribed circle of the polygonal hole and a vertex of the polygonal hole is a straight line. The line segment other than the straight line may be a curved line in which the center side of the inscribed circle is concave.

[0033] The chassis of the present invention is a chassis in which a first plate member and a second plate member are fastened with at least one shaft, wherein the first plate member and the second plate member are connected to each other. In each of the polygonal through-holes formed, a portion of each shaft, which is fitted into the through-hole, is plastically deformed and caulked to substantially the same shape as the polygon.

In the chassis of the present invention configured as described above, each axis is plastically deformed into a polygonal through hole formed in each plate member so as to have substantially the same shape as the polygon and caulked. For this reason, not only the frictional force of the surface in contact with the plate member but also the side of the shaft, which is plastically deformed and has substantially the same shape as the polygonal hole, is polygonal. By hitting each side of the hole, the shaft whose rotation is restricted can withstand high rotational torque. That is, since the chassis of the present invention uses the shaft capable of withstanding high rotational torque as the member member, the torsional rigidity of the chassis is enhanced.

In the chassis of the present invention, each side of the polygonal through-hole formed in the first plate member and the second plate member may be inscribed circle of the polygonal hole. A line segment connecting the point where is in contact with the vertex of the polygonal hole may be formed other than a straight line, and the line segment other than the straight line is a curved line in which the center side of the inscribed circle is concave. There may be. Also,
The first plate member and the second plate member may be members of the same shape formed in the same mold. Thereby, the accuracy of the first plate member and the accuracy of the second plate member can be made uniform. Therefore, when a plurality of axes are caulked in parallel to each plate member, the accuracy of the parallelism of each axis can be easily obtained. .

The recording apparatus of the present invention is an ink jet recording apparatus having a conveying means for conveying a recording medium, and a carriage for reciprocating in a direction intersecting the conveying direction of the recording medium and for mounting a recording head. In the present invention, a structure for holding the carriage so as to be able to reciprocate along the axes between the first plate member and the second plate member is a chassis of the present invention.

Further, the ink jet recording apparatus of the present invention comprises a conveying means for conveying a recording medium and a carriage for reciprocating in a direction intersecting the conveying direction of the recording medium and for mounting an ink jet recording head. In the inkjet recording apparatus having, the carriage,
The structure of the present invention is characterized in that a structure that holds the first plate member and the second plate member so as to be reciprocally movable along each axis is the chassis of the present invention.

In the recording apparatus and the ink jet recording apparatus of the present invention as described above, the shaft for guiding the carriage is
A structure having high torsional rigidity, which is a member member capable of withstanding high rotational torque, is used as a carriage chassis. Therefore, it is not necessary to add a plate member or the like for increasing the rigidity of the chassis.

[0039]

Next, embodiments of the present invention will be described with reference to the drawings. (First Embodiment) A caulking method and a caulking structure according to a first embodiment of the present invention for joining a metal shaft and a sheet metal will be described below.

As shown in FIG. 1A, a step ₂ having a diameter d ₂ and a length 1 is formed at an end of the shaft 1 having a diameter d _1. A center hole 3 is formed. The diameter d ₃ of the center hole 3 is, for example, a diameter d ₃ = d
A 90-degree center hole of _2- (0.4 [mm] to 1.0 [mm]) may be used. The length l of the step 2, the shaft 1 is caulked, slightly longer than the thickness t ₁ of the metal plate 4 shown in FIG. 1 (b), for example, than the thickness t ₁ .2-0. 5
It is preferable that the length is about [mm].

On the other hand, at the position where the shaft 1 of the sheet metal 4 is joined,
As shown in FIG. 1B, a polygonal hole 7 penetrating the sheet metal 4 is formed. This polygonal hole 7 is shown in FIG.
However, a polygon other than a hexagon may be used, and a polygon having an inscribed circle in which the step portion 2 fits without play is preferable.

Next, as shown in FIG. 2, the step portion 2 of the shaft 1 is engaged with the polygonal hole 7 formed in the sheet metal 4.
FIG. 2 shows a state in which the shaft 1 is inserted from the back side of the sheet metal 4 and the tip of the step portion 2 projects from the polygonal hole 7.

Next, the step 2 of the shaft 1 having a circular cross section
As shown in FIG. 3A, the stepped portion 2 of the shaft 1 is formed into a substantially same shape as the polygonal hole 7 of the sheet metal 4 by using a punch having the same shape as the polygonal hole 7 of the sheet metal 4. The shaft 1 is caulked with respect to the sheet metal 4 by plastic deformation. As can be seen from FIG. 3B, which is an enlarged view of the stepped portion 2 of the shaft 1 swaged in this manner viewed from the axial direction of the shaft 1, the stepped portion 2 of the shaft 1 is formed.
And the side surface 7a of the polygonal hole 7 is in surface contact with the polygonal surface. That is, the torque applied to the shaft 1 is received by the swaging part shown in FIG.
FIG. 3 (c), which is a side sectional view seen in the direction,
Not only the frictional force between the surface 6 where the step portion 2 of the shaft 1 is in contact with the sheet metal 4 due to plastic deformation and the sheet metal 4, but also the side surface 2 a of each step portion of the step portion 2 of the shaft 1 has a polygonal hole 7. Since the rotation of the shaft 1 is restricted by hitting each hole side surface 7a, it is possible to withstand higher rotation torque.

In the conventional caulking method and the caulking structure, when a torque exceeding the allowable rotation torque is applied, there is no deformation between the sheet metal 4 and the shaft 1, and the shaft only rotates.
In the present embodiment, one or both of the sheet metal 4 and the stepped portion 2 of the shaft are deformed.

In other words, according to the caulking method and the caulking structure of this embodiment, it is possible to withstand high rotational torque until the sheet metal 4 or the step portion 2 of the shaft is deformed.

Further, since the step portion 2 of the shaft 1 is plastically deformed into a polygonal shape by caulking, a polygonal process which requires more processing time than caulking the step portion 2 of the shaft 1 before caulking the step portion 2 of the shaft 1. It does not need to be formed into a shape. On the other hand, since the polygonal hole 7 of the sheet metal 4 can also be formed by a single punching process similar to the case of a circular shape, the processing time does not take extra time as compared with forming a circular through hole. . (Second Embodiment) Next, a swaging method and a swaging structure according to a second embodiment of the present invention will be described.

FIG. 4 is a top view of the through hole 17 formed in the sheet metal on which the shaft is swaged according to the present embodiment.

The through-hole 17 is a substantially hexagonal hole formed by connecting the apexes 18 not by planes but by curved surfaces 21 in which the center of the through-holes 17 is concave. In other words, the through hole 1
7 is a point where each side of the polygon is in contact with the inscribed circle of the polygon,
This is a shape in which a line segment connecting the vertices 18 is formed other than a straight line.
With such a shape, the angle of the vertex 18 becomes smaller than the angle of the normal hexagonal vertex. For example, in the case of a regular hexagon, the angle between the diagonal line and the side of the regular hexagon at the vertex of the regular hexagon is 60 degrees, while in FIG. 4, the vertex 18 of the through hole 17 corresponding to this angle corresponds to this angle. Is as small as 58.057 degrees. This makes it possible to withstand higher rotational torque. That is, as the angle of the apex 18 becomes smaller, the angle between the surface receiving the rotational torque applied to the shaft and the direction of the force of the rotational torque becomes closer to the vertical, and the shaft becomes larger due to the higher rotational torque.
This is because the risk of licking can be reduced.

The dimensions and angles of each part shown in FIG. 4 are merely examples, and the present invention is not limited to these numerical values.

[0050]

Next, an ink jet recording apparatus using the caulking method and the caulking structure described in the first or second embodiment will be described.

FIG. 5 is a schematic perspective schematic view of an ink jet recording apparatus having a carriage chassis constituted by the caulking structure of each of the above-described embodiments, FIG. 6 is a perspective view showing details of the carriage chassis, and FIG. FIG. 7 is a diagram for explaining fixing by caulking with a sub-shaft, and FIG. 8 is a perspective view of a recording sheet conveyance system including a carriage chassis for explaining conveyance of the recording sheet.
A side view is shown in FIG.

First, the outline of the ink jet recording apparatus of this embodiment will be described with reference to FIG.

The ink jet recording apparatus shown in FIG. 5 reciprocates (main scanning) an ink jet recording head (not shown).
And the conveyance (sub-scanning) of the recording sheet S such as general recording paper, special paper, OHP film, etc. at a predetermined pitch is repeated, and ink is selectively ejected from the ink jet recording head in synchronization with these movements. Is a serial-type recording apparatus that forms characters, symbols, images, and the like by being attached to a recording sheet S.

In FIG. 5, an ink jet cartridge 51 having an ink jet recording head (not shown)
Guide shaft 63, left side plate 78, and right side plate 79
Is slidably supported by the sub-shaft 82 fixed by caulking described in the first or second embodiment, and is detachable from the carriage 62 which reciprocates along the guide shaft 63 and the sub-shaft 82. It is installed in. The recording sheet S is conveyed by a conveying unit described later so as to face the ink ejection surface of the ink jet recording head and to intersect with the moving direction of the carriage 62 so as to maintain a constant distance from the ink ejection surface (for example, The sheet is transported in the direction perpendicular to the arrow A ′).

The ink jet recording head has a plurality of nozzle rows for ejecting inks of different colors. A plurality of independent main tanks 54 are detachably mounted on the ink supply unit 55 corresponding to the colors of the ink ejected from the ink jet recording head. The ink supply unit 55 and the ink jet recording head are connected to the ink jet cartridge 51 by a plurality of tubes 56 corresponding to the colors of the ink, and the main tank 54 is mounted on the ink supply unit 55, so that the main tank 54 The stored ink of each color can be independently supplied to each nozzle row of the inkjet recording head.

In the non-recording area which is within the reciprocating range of the ink jet recording head and outside the passing range of the recording sheet S, the recovery unit 57 is set so as to face the ink ejection surface of the ink jet recording head. Are located. The recovery unit 57 includes a cap unit for capping the ink ejection surface of the inkjet recording head,
The ink jet recording head includes a suction mechanism for forcibly sucking ink from the ink jet recording head while the ink ejection port surface is capped, a cleaning blade for wiping dirt on the ink ejection surface, and the like.

Next, the carriage chassis 90 will be described with reference to FIGS.

As shown in FIG. 6, the carriage chassis 90 includes a left side plate 78, a right side plate 79, a left side plate 78, a sub shaft 82 fixed to each of the right side plates 79 by the above-described caulking, and a carriage 62. And the carriage plate 64, which is a plate member having the scanning direction as a longitudinal direction.

As shown in FIG. 7 (a), the left side plate 78 and the right side plate 79 have polygonal through holes 80, 8 respectively.
The through holes 80 and 81 are sized to fit into the step portions 82a and 82b (both cylindrical) at both ends of the sub shaft 82 without play.

Further, as shown in FIG.
Is a drive pulley 66 attached to the carriage motor 65, and a driven pulley 68 corresponding to the drive pulley 66.
A part is fixed to a timing belt 67 stretched between them, and reciprocating movement is performed along the guide shaft 63 by changing the rotation direction of the carriage motor 65.

First, as shown in FIG. 7 (b), the sub-shaft 82 is fastened to the right plate 79 and the left plate 78.
The step 82a of the sub shaft 82 is inserted into the polygonal through hole 80 of the left side plate 78, and the step 82
b is fitted into each of the polygonal through holes 81 of the right side plate 79. Then, the step portions 82a, 8 of the sub shaft 82
2b, the steps 82a and 82b are plastically deformed to have substantially the same shape as the polygonal through holes 80 and 21 of the left side plate 78 and the right side plate 79, so that the left side plate 78 and the right side plate 7 are deformed.
9 and the sub shaft 82 is fastened.

According to the above-described caulking method of the present invention, the allowable rotation torque of the sub-shaft 82 is determined by the frictional force of the surface of the sub-shaft 82 which is in contact with the plane of the left side plate 78 and the right side plate 79 due to the plastic deformation of the steps 82a and 82b. Not only that, the tip shapes of the step portions 82a and 82b of the sub shaft 82 are plastically deformed into the shapes of the polygonal through holes 80 and 21 of the left side plate 78 and the right side plate 79, so that the rotational torque can be reduced by the polygonal side surfaces. And can withstand higher permissible rotational torque.

The carriage chassis 90 composed of the sub-shaft 82 having such a caulking structure, the left side plate 78 and the right side plate 79 has high torsional rigidity. Of course, the sub shaft 82 and the left side plate 78 and the right side plate 79 may be fastened by welding or the like, but the crimping of the present invention is excellent in that it is inexpensive and has no thermal deformation.

Further, since the stay as a member member is fastened to the left side plate 78 and the right side plate 79 substantially in parallel with the sub shaft 82, high rigidity can be obtained with a small amount of sheet metal. Note that stays are not shown in the drawings of this embodiment for simplicity.

The guide shaft 63 includes a sub shaft 82
A vertical adjustment mechanism (not shown) is provided in order to obtain the parallelism with the above. However, the guide shaft 63 is also caulked against each of the left side plate 78 and the right side plate 79 similarly to the sub shaft 82. In addition, stronger rigidity can be obtained. In this case, the sub shaft 82 and the guide shaft 63
In order to improve the degree of parallelism, the left side plate 78 and the right side plate 79
Are formed in the same shape and have the same shape, it is also possible to obtain a configuration in which rigidity can be ensured while increasing the accuracy of the parallelism between the sub shaft 82 and the guide shaft 63.

Next, the conveyance of the recording sheet S will be described with reference to FIG.
This will be described with reference to FIG.

A recording sheet S as a recording medium is set in a cassette 69, separated and conveyed one by one by a separating mechanism (not shown), and passes through a U-turn roller 70 connected to a driving source (not shown). Reaches a LF roller 71 connected to a drive source (not shown), and is sent to a recording unit on a platen 72. Therefore, recording is performed on the recording sheet S by the reciprocating movement of the carriage 62 and the ink jet recording head mounted on the carriage 62. After recording, the recording sheet S is transferred to a discharge roller 7 connected to a driving source (not shown).
3, the paper is discharged onto the paper discharge tray 74.

In the present embodiment, an ink jet recording apparatus that performs recording by discharging ink has been described as an example. However, the high-rigidity chassis configuration of the present embodiment is different from that of a recording apparatus chassis of another recording method. Needless to say, it is applicable.

[0069]

As described above, according to the present invention,
The hole of the plate member is formed in a polygonal shape, and the shaft is plastically deformed to have substantially the same shape as the polygon, whereby the shaft is caulked and fixed to the plate member. For this reason, the shaft and the plate member regulate not only the frictional force of the contact surface but also the rotation of the shaft by the fact that each side of the shaft hits each side of the polygonal hole. And a caulking configuration that can withstand high rotational torque.

Further, in the recording apparatus and the ink jet recording apparatus of the present invention, an extra plate member or the like for increasing the rigidity of the chassis is added by using the chassis formed by using the caulking of the present invention as the chassis of the carriage. No need to do. For this reason, it is possible to provide an ink jet recording apparatus in which cost is reduced and weight increase is suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shaft and a sheet metal provided with a polygonal through-hole in which a shaft is swaged according to a first embodiment, which is swaged by a swaging method of the present invention.

FIG. 2 is a diagram showing a state where a shaft is engaged in a polygonal through hole of a sheet metal.

FIG. 3 is a view showing a state where a shaft is swaged into a polygonal through hole.

FIG. 4 is a diagram illustrating an example of a polygonal through hole formed in a sheet metal whose axis is caulked according to the second embodiment in the caulking method of the present invention.

FIG. 5 is a schematic perspective schematic view of an example of an ink jet recording apparatus having a carriage chassis configured by using the caulking method of the present invention.

FIG. 6 is a perspective view illustrating details of a carriage chassis of the inkjet recording apparatus illustrated in FIG. 5;

FIG. 7 is a diagram illustrating fixing of the left and right side plates and the sub shaft by caulking in the carriage chassis shown in FIG. 6;

FIG. 8 is a perspective view of a recording sheet conveyance system including a carriage chassis for explaining conveyance of the recording sheet.

FIG. 9 is a side view of a recording sheet conveyance system including a carriage chassis for explaining conveyance of the recording sheet.

FIG. 10 is a diagram illustrating an example of a shaft having an end processed for fixing by caulking;

FIG. 11 is a perspective view of a conventional sheet metal in which a through hole for caulking a shaft is formed.

12 is a side sectional view showing a state where the shaft shown in FIG. 10 is engaged with the sheet metal shown in FIG. 11, and a side sectional view showing a surface where the shaft in a conventional caulking receives rotational torque; is there.

FIG. 13 is a perspective view of a structure of an example of a conventional ink jet recording apparatus for reciprocally scanning a vertical carriage.

FIG. 14 is a perspective view of a horizontal carriage chassis as an example of a conventional ink jet recording apparatus.

FIG. 15 is a perspective view of a recording sheet transport system including a carriage chassis shown in FIG. 14, for explaining transport of a recording sheet in an example of a conventional inkjet recording apparatus.

16 is a side view of a recording sheet conveyance system including a carriage chassis shown in FIG. 14 for explaining conveyance of a recording sheet in an example of a conventional ink jet recording apparatus.

[Explanation of symbols]

1 shaft 2 stepped portion 2a stepped portion side surface 3 center hole 4 sheet metal 6 surface 7a hole side surface 7 polygonal hole 17, 80, 81 through hole 18 vertex 21 curved surface 51 inkjet cartridge 54 main tank 55 ink supply unit 56 tube 57 recovery unit 62 Carriage 63 Guide shaft 64 Carriage plate 65 Carriage motor 66 Drive pulley 67 Timing belt 68 Follower pulley 69 Cassette 70 Turn roller 71 LF roller 72 Platen 73 Discharge roller 78 Left side plate 79 Right side plate 82 Sub shaft 82a, 82b Step 90 Carriage chassis S recording sheet d ₁ diameter d ₂ the diameter d ₃ diameter t ₁ thickness

Continuation of the front page (72) Inventor Yudai Miyake 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2C061 AQ05 BB30

Claims (12)

[Claims] 1. A caulking method for caulking a shaft to a plate member, comprising the steps of: forming a hole in the plate member into which the shaft is fitted into a polygon; and fitting the shaft into the through hole of the shaft. Plastically deforming the bent portion into substantially the same shape as the polygon. 2. A step of forming a point other than a straight line at a point where each side of the polygonal hole contacts an inscribed circle of the polygonal hole and a line connecting the vertices of the polygonal hole. The swaging method according to claim 1. 3. The caulking method according to claim 2, further comprising the step of forming a line segment other than the straight line into a curve in which the center side of the inscribed circle is concave. 4. A caulking structure in which a shaft is fixed to a plate member by caulking, wherein the shaft is fitted into a hole of the plate member formed into a polygon into which the shaft is fitted, and is fitted into the hole of the shaft. A portion which is plastically deformed and caulked to substantially the same shape as the polygon. 5. A line segment connecting a point where each side of the polygonal hole and an inscribed circle of the polygonal hole of the hole is in contact with a vertex of the polygonal hole is formed other than a straight line. Claim 4
The swaging structure described in the above. 6. The swaging structure according to claim 5, wherein the line segment other than the straight line is a curved line in which the center side of the inscribed circle is concave. 7. A chassis in which a first plate member and a second plate member are fastened by at least one shaft, wherein the chassis is formed on each of the first plate member and the second plate member. A chassis, wherein a portion of each shaft fitted in the through hole is plastically deformed and caulked to substantially the same shape as the polygon in the polygonal through hole. 8. The polygonal through-holes formed in the first plate member and the second plate member, each side of the polygonal hole and an inscribed circle of the polygonal hole. And the point where
The chassis according to claim 7, wherein a line segment connecting the apex of the polygonal hole is formed other than a straight line. 9. The chassis according to claim 8, wherein the line segment other than the straight line is a curved line in which the center side of the inscribed circle is concave. 10. The chassis according to claim 7, wherein the first plate member and the second plate member are members having the same shape and formed in the same mold. 11. A printing apparatus comprising: transport means for transporting a recording medium; and a carriage for reciprocating in a direction intersecting the transport direction of the recording medium and for mounting a recording head. The structure according to any one of claims 7 to 10, wherein a structure that holds the first plate member and the second plate member so as to reciprocate along the respective axes is the chassis according to any one of claims 7 to 10. Characteristic recording device. 12. An ink jet recording apparatus, comprising: a conveying unit for conveying a recording medium; and a carriage for reciprocating in a direction intersecting the conveying direction of the recording medium and for mounting an ink jet recording head. The chassis according to any one of claims 7 to 10, wherein a structure that holds the first plate member and the second plate member so as to be able to reciprocate along the respective axes is provided between the first plate member and the second plate member. An ink jet recording apparatus comprising: