JPH09150562A - Shaft component supporting structure for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of parts of a shaft component supporting structure for supporting a carriage of a printer and also reduce the assembly cost thereof. SOLUTION: A carriage is supported movably by a guide shaft 8 set on a carriage supporting frame 5 and a guide flange set in parallel with the guide shaft. A pair of supporting frames 31 and 32 are formed on both ends of the frame 5, and one end 8a of the guide shaft 8 is inserted into a retaining hole of the supporting frame 31 on the left and the shaft direction position is controlled by bringing the end face of the guide shaft into contact with a U-shaped cut protrusion section 35 into the orthogonally crossing shape. The other end 8b of the guide shaft 8 is supported by a bearing bush 40 fitted in an opening section of the supporting frame 32 on the right.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft member supporting structure for a printer, and more particularly, to one end of the shaft member held in a holding hole of a plate-like frame to regulate the position by a cut-and-raised portion, and the other end portion of the shaft member. The present invention relates to a structure in which a bearing bush supports and positions are restricted.

[0002]

2. Description of the Related Art Conventionally, a carriage on which a recording head of a printer is mounted is supported so as to be capable of reciprocating in a printing line direction. Usually, the carriage is supported by a shaft member and a guide extending parallel to the shaft member. The rotation is restricted while being guided by the flange. A metal plate frame is provided for supporting both ends of the shaft member and forming guide flanges, and guide flanges are formed in the longitudinal direction of the frame main body of the plate frame so that both ends of the plate frame are formed. A pair of support frames that support both ends of the shaft member are formed in the portion. Then, generally, cap-shaped bearing bushes made of synthetic resin are attached to the pair of support frames, and both end portions of the shaft member are fitted to these bearing bushes to support both end portions of the shaft member, respectively. The position is regulated so that it does not move in the axial direction. An eccentric bearing bush is often applied as the bearing bush.

[0003]

In the shaft member support structure as described above, since two bearing bushes made of synthetic resin are required, the cost of parts thereof becomes high, and the two bearing bushes respectively support frames. A considerable amount of labor is required for the assembling work for assembling with a screw or the like, which is also disadvantageous in terms of installation cost. Therefore, it is possible to omit the bearing bush and support both ends of the shaft member in the shaft support holes of the support frame, but the assembly of the shaft member becomes troublesome and
A regulation mechanism for regulating the axial position of the shaft member is required. An object of the present invention is to reduce the parts cost of the shaft member support structure of the printer and the assembly cost.

[0004]

According to a first aspect of the present invention, there is provided a shaft member support structure for a printer, wherein the shaft member support structure supports both end portions of the shaft member of the printer on a plate frame made of metal. The holding hole holds the end portion near one end of the shaft member, and the cut-and-raised portion cut and raised from the portion of the plate-like frame near the holding hole is brought into contact with the end surface of the one end of the shaft member from the outside. It is a thing. A portion near one end of the shaft member is held in a holding hole formed in the plate-shaped frame, and a cut-and-raised portion abuts the end surface of the one end of the shaft member from the outside to regulate the axial position. Therefore, without using a bearing bush that is a separate component from the plate-shaped frame, the holding hole formed in the plate-shaped frame and the cut-and-raised portion can support the position of one end of the shaft member by supporting the plate-shaped frame. ,
It is possible to reduce the component cost and the assembly cost.

A shaft member supporting structure for a printer according to a second aspect is
In the invention of claim 1, the cut-and-raised portion is a U-shaped cut-and-raised portion that is cut and raised orthogonally to a surface of the plate-shaped frame including the holding hole. In this way, by carefully devising the shape of the cut-and-raised part, the U-shaped cut-and-raised part was formed orthogonally to the surface including the holding hole of the plate frame, so that the cut-and-raised part was formed on the end surface of one end of the shaft member. The position can be regulated by abutting from the outside. Further, since the cut-and-raised portion may be formed orthogonally to the surface including the holding hole of the plate-shaped frame, the molding cost for forming the cut-and-raised portion can be reduced. In addition, the same operation as the first aspect is achieved.

According to a third aspect of the present invention, there is provided a shaft member support structure for a printer,
In the invention of claim 1 or 2, the other end of the shaft member is fitted into a concave fitting hole of a bearing bush, and the bearing bush is fitted and fixed in the opening of the plate-shaped frame. . Since the other end of the shaft member is fitted in the concave fitting hole of the bearing bush, the other end of the shaft member can be supported and the axial position can be regulated. Then, when assembling the shaft member, one end portion of the shaft member is fitted into the holding hole and the other end is fitted into the opening, and the bearing bush is fitted from the outside to the other end and the opening of the shaft member. It can be easily assembled by fixing the bush to the plate-shaped frame.

The shaft member supporting structure of the printer according to claim 4 is
In the invention of claim 3, the plate-shaped frame has a frame main body portion parallel to the shaft member, and a pair of support frames rising orthogonally from both ends of the frame main body portion. A holding hole is formed and an opening is formed in the other support frame, and a carriage on which a print head is mounted is movably supported by a shaft member. Thus, since the frame main body and the pair of support frames are formed as an integral part, the number of parts can be reduced, the assembling accuracy of the shaft member can be improved, and other effects similar to those of claim 3 are achieved. .

According to a fifth aspect of the present invention, there is provided a shaft member supporting structure for a printer,
In the invention of claim 4, a guide flange is formed on the frame main body, the guide flange being spaced apart from the shaft member by a predetermined distance and parallel to the shaft member, the guide flange movably guiding a carriage movably supported by the shaft member. It was done. Therefore, the carriage can be guided movably by the guide flange, and the guide flange can be formed by effectively utilizing the plate frame. In addition, the same operation as the fourth aspect is achieved.

A shaft member supporting structure for a printer according to a sixth aspect is
In the invention of claim 4 or claim 5, the print head is an ink jet print head that prints by ejecting ink from nozzles. Even in a printer that records with an ink jet type print head, since the guide accuracy for guiding the carriage is important, the carriage can be guided with high accuracy by the shaft member and the guide flange.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to an inkjet printer. As shown in FIGS. 1 and 2, in the inkjet printer 1, the main body unit 2 is fixed to the lower case 3 with screws and the carriage 4 is fixed. Carriage support frame 5 to support
Is attached to the lower case 3 at the mounting portions 5a at both ends thereof.
It is fixed to the mounting portion 3a of with a screw.

The print head 6 of the carriage 4 has four ink jet nozzles for ejecting and recording four color inks of magenta, yellow, cyan and black, and four ink cartridges 7a for supplying ink to these ink jet nozzles. ~ 7d. This carriage 4
Is movably supported by a guide shaft 8 in the axial direction, and a guide flange 9 formed in parallel with the guide shaft 8 on a carriage supporting frame 5 is slidably engaged with a guided groove 4a of the carriage 4, 4 is guided and supported by a guide flange 9 whose rotation is restricted. The carriage 4 is driven to reciprocate in the left-right direction via a wire and a pulley by a carriage drive motor 10 attached to the lower surface of the right end portion of the carriage support frame 5.

A paper feed cassette 11 is detachably attached to the rear portion of the main body unit 2, and the paper in the paper feed cassette 11 is fed by a paper feed roller 12 and conveyed by a conveyance roller 13 and a driven roller 14. , Paper is print head 6 and guide wall 1
Ink is ejected from the ink jet nozzles of the print head 6 while passing between the recording head 5 and the recording head 5 to be recorded. The driven roller 1
The four support arms 16 that support 4 are rotatably supported by a support shaft 17 and are urged by a spring 18 toward the transport roller 13 side. The sheet recorded by the inkjet nozzle is discharged to the discharge unit 21 by the discharge roller 19 and the spur roller 20.

An electric component unit 22 including a power supply device and a circuit board is arranged below the main unit 2, and a unit cover 23 to which the electric component unit 22 is attached is fixed to the lower case 3 with screws. A side case 24 is provided to cover the left and right side surfaces and the rear side surface of the main body unit 2 and the carriage movement space, and an upper cover 25 to cover the upper surface side of the main body unit 2 and the carriage movement space.

Next, a guide shaft 8 for supporting the carriage 4
The support structure for supporting both ends of the (shaft member) on the carriage support frame 5 and the carriage support frame 5 will be described. As shown in FIGS. 1 to 3, the carriage support frame 5 is an integral part manufactured by forming a steel plate,
The carriage support frame 5 is parallel to the guide shaft 8 and is inclined downward by approximately 45 degrees to the rear of the frame body 3.
0, a pair of support frames 31 and 32 which are raised at right angles on both ends thereof, a front wall portion 33 which is raised at a right angle to the front end portion of the frame body portion 30, and an upper end of the front wall portion 33. The guide shaft 9 is bent rearward at a right angle and has a guide flange 9 parallel to the guide shaft 8. The guide shaft 8 is supported by the left support frame 31 in the vicinity of the left end thereof, and the right end of the guide shaft 8 is supported by the right support member. It is supported by the frame 32.

As shown in FIGS. 4 to 6, in order to support the portion near the left end of the guide shaft 8, the support frame 31 has a holding hole 34 and a cut-and-raised portion cut from a portion near the holding hole 34. The portion 35 is formed with a U-shaped cut-and-raised portion 35 that is cut and raised orthogonally to the surface of the support frame 31 including the holding hole 34. In FIG. 6, the support frame 31 has a holding hole 34 and a cut-and-raised portion 35 before bending.
A and P are shown punched, and the cut-and-raised portion 35A before bending is bent at the position of the fold line 36 at a right angle to the outside, thereby cutting and raising the holding hole 34 in FIGS. 4 and 5. The part 35 is formed. Although the upper end portion of the holding hole 34 is formed in an open shape, the upper end portion of the holding hole 34 is not opened by punching the upper end portion of the holding hole 34 as shown by the two-dot chain line in FIG. It can also be formed.

The small-diameter shaft portion 8a at the left end portion of the guide shaft 8 is inserted into the holding hole 34 from the right side, the portion near the left end of the guide shaft 8 is supported by the holding hole 34, and the left end surface of the guide shaft 8 is cut. The axial position of the guide shaft 8 is regulated by being brought into contact with the raised portion 35. As shown in FIGS.
Since the right end of the guide shaft 8 is supported by the support frame 32,
The right support frame 32 is formed with an opening 39 including a main opening 36, an auxiliary opening 37, and a pin opening 38. The main opening 36 has a small-diameter shaft portion 8b at the right end of the guide shaft 8.
With the bearing bush 40 inserted, a cap bush bearing bush 40 made of synthetic resin is attached to the opening 39 from the outside, and then the bearing bush 40 is rotated to fix the bearing bush 40 to the support frame 32 and to guide the guide shaft 8 The right end of is supported.

The main opening 36 has a shaft hole 36a into which the guide shaft 8 is fitted, an enlarged hole 36b, and a large diameter hole 36c. The auxiliary opening 37 has an enlarged hole 37a and an arc hole. 37
b. The bearing bush 40 includes a cap portion 42 having a concave fitting hole 41 into which the small diameter shaft portion 8b is fitted,
A flange portion 43, an enlarged flange portion 44, an engagement pin portion 45 protrudingly provided on an inner surface portion of the enlarged flange portion 44,
The circular arc hole 46 formed in the cap portion 42, the thin peripheral wall portion 47 formed in the peripheral wall portion of the cap portion 42 at a position corresponding to the outer peripheral side of the circular arc hole 46, and extending to the inner surface of the support frame 32, and the thin wall peripheral wall It has a small protrusion 48 formed on the outer surface of the portion 47, and engaging piece portions 49 a and 49 b that are engaged with the inner surface side of the support frame 32. The thin peripheral wall portion 47 is elastically deformable in the radial direction of the fitting hole 41.

When assembling the guide shaft 8, before supporting the small-diameter shaft portion 8a of the guide shaft 8 on the support frame 31, the small-diameter shaft portion 8b at the right end portion of the guide shaft 8 is inserted from the inside to the main opening 36.
And then move it to the left to hold the small diameter shaft 8a in the holding hole 3
4 and put it in contact with the cut-and-raised portion 35. Next, the bearing bush 40 is set to the posture shown in FIG.
The opening 39 is set on the outer surface of 2. At this time, the engaging piece portions 49a and 49b are inserted into the enlarged hole portions 36b and 37a, respectively, so that they can be engaged with the inner surface of the support frame 32, and the right end portion of the small diameter shaft portion 8b is fitted into the fitting hole 41. Have been combined.

Next, the bearing bush 40 is rotated counterclockwise in FIG. 9 to fit the engaging pin portion 45 into the pin opening portion 38 as shown in FIG. Four
9a and 49b are engaged with the inner surface of the support frame 32.
At this time, since the small protrusion 48 is pressed by the outer peripheral surface of the large diameter hole 36c, the thin peripheral wall portion 47 is pressed toward the small diameter shaft portion 8b side, and the small diameter of the guide shaft 8 is maintained without rattling of the guide shaft 8. The shaft portion 8b is supported by the bearing bush 40. Also,
The bearing bush 40 has a flange portion 43 and an engagement piece portion 49.
The support frame 32 is sandwiched and fixed between a and 49b.

The operation of the guide shaft support structure and the carriage support frame 5 described above will be described. A holding hole 34 formed in the support frame 31 holds a portion near the left end of the guide shaft 8, and a cut and raised portion 35 cut and raised from a portion near the holding hole 34 is brought into contact with the left end surface of the guide shaft 8 from the outside. Therefore, without using a bearing bush which is a separate component from the support frame 31, the holding hole 34 and the cut-and-raised portion 35 formed in the support frame 31 support the vicinity of the left end of the guide shaft 8 on the support frame 31. Since the directional position can be regulated, the component cost and the assembly cost can be reduced.

Since the cut-and-raised portion 35 is a U-shaped cut-and-raised portion which is cut and raised orthogonally to the surface of the support frame 31 including the holding hole 34, the cut-and-raised portion 35 is provided on the left end surface of the guide shaft 8. The position in the axial direction of the guide shaft 8 can be regulated by abutting from the outside. Further, since the cut-and-raised portion 35 is orthogonal to the support frame 31,
The molding cost for forming the cut-and-raised portion 35 can be reduced.

The right end portion of the guide shaft 8 is provided with a bearing bush 4
The bearing bush 4
Since 0 is fitted and fixed in the opening 39 of the support frame 32, the right end of the guide shaft 8 can be supported and the axial position can be regulated via the bearing bush 40. Also, the guide shaft 8
When assembling, it can be easily assembled via the bearing bush 40.

The carriage support frame 5 has a frame main body 30 parallel to the guide shaft 8 and a pair of support frames 31 and 32 standing upright from both ends of the frame main body 30. Since the holding hole 34 and the cut-and-raised portion 35 are formed in the support frame 31 and the opening 39 is formed in the right support frame 32, the carriage 4 carrying the print head 4 is movably supported by the guide shaft 8. The number can be reduced and the assembling accuracy of the guide shaft 8 can be improved.

Since the guide flange 9 is formed on the frame body portion 30 of the carriage supporting frame 5, the carriage 4 can be guided movably by the guide flange 9, and the guide flange 9 can be utilized by effectively utilizing the carriage supporting frame 5.
Can be formed. In addition, in the said embodiment, although the case where this invention was applied to the shaft member support structure which supports the guide shaft 8 was demonstrated as an example, this invention is also applicable to the shaft member support structure which supports shaft members other than the guide shaft 8. Are similarly applicable. Further, the shape of the cut-and-raised portion 35 is merely an example, and the cut-and-raised portion may have an appropriately changed shape.

[0025]

In the shaft member supporting structure of the printer according to the first aspect of the present invention, the holding hole formed in the plate-shaped frame holds the end portion of one end of the shaft member near the holding hole of the plate-shaped frame. Since the cut-and-raised part that was cut and raised from the part was brought into contact with the end surface of one end of the shaft member from the outside, without using the bearing bush that is a separate part from the plate-shaped frame, With the raised portion, one end of the shaft member can be supported by the plate-shaped frame to regulate the axial position,
It is possible to reduce the component cost and the assembly cost.

According to the shaft member supporting structure of the printer of the second aspect, the same effect as that of the first aspect can be obtained, but the cut-and-raised portion is cut and raised orthogonally to the surface including the holding hole of the plate-shaped frame. Since it is a U-shaped cut-and-raised portion, the cut-and-raised portion can be brought into contact with the end surface of one end of the shaft member from the outside to regulate the axial position of the shaft member. Further, it is possible to reduce the molding processing cost for forming the cut and raised portion.

According to the shaft member supporting structure of the printer of the third aspect, the same effect as that of the first or second aspect is obtained, but the other end portion of the shaft member is fitted in the concave fitting hole of the bearing bush. Since the bearing bush is fitted and fixed in the opening of the plate-shaped frame, the other end of the shaft member can be supported and the axial position can be regulated via the bearing bush. Also,
When the shaft member is assembled, it can be easily assembled via the bearing bush.

According to the shaft member supporting structure of the printer of the fourth aspect, the same effect as that of the third aspect can be obtained, but the plate-shaped frame has a frame main body portion parallel to the shaft member and both ends of the frame main body portion. It has a pair of support frames that stand up in an orthogonal direction, and a holding hole is formed in one support frame and an opening is formed in the other support frame, so that a carriage equipped with a print head can be freely moved on a shaft member. Since it is supported, the number of parts can be reduced, and the assembling accuracy of the shaft member can be improved.

According to the shaft member supporting structure of the printer of the fifth aspect, the same effect as that of the fourth aspect can be obtained, but the frame main body is a guide flange which is separated from the shaft member by a predetermined distance and is parallel to the shaft member. Since the guide flange for movably guiding the carriage movably supported by the shaft member is formed, the carriage can be movably guided by the guide flange, and the guide flange can be formed by effectively utilizing the plate frame. .

According to the shaft member supporting structure of the printer of claim 6, the same effect as that of claim 4 or 5 is obtained, but the print head is an ink jet type print head for ejecting ink from nozzles for printing. However, even in the case of a printer that records with an ink jet type print head, the guide accuracy for guiding the carriage is important, so the carriage can be guided with high accuracy by the shaft member and the guide flange.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of essential parts of an inkjet printer according to an embodiment of the present invention.

2 is a vertical left side view of the printer of FIG. 1. FIG.

FIG. 3 is a plan view of a carriage support frame and a guide shaft.

FIG. 4 is a left side view of a main part of a left support frame and a guide shaft.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a left side view of a main part of a left support frame (before bending the cut-and-raised part).

FIG. 7 is a right side view of a main part of a right support frame.

FIG. 8 is a right side view of the bearing bush.

FIG. 9 is a right side view of a main part of a right support frame, a bearing bush (before rotation), and a guide shaft.

FIG. 10 is a right side view of a main part of a right support frame, a bearing bush, and a guide shaft.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inkjet printer 4 Carriage 5 Carriage support frame 6 Print head 8 Guide shaft 9 Guide flange 30 Frame body 31, 32 Support frame 34 Holding hole 35 Cut and raised part 39 Opening 40 Bearing bush 41 Fitting hole

Claims (6)

[Claims] 1. A shaft member supporting structure for supporting both ends of a shaft member of a printer in a plate frame made of metal, wherein a holding hole formed in the plate frame holds a part near one end of the shaft member. At the same time, a shaft member supporting structure for a printer is characterized in that a cut-and-raised portion cut and raised from a portion of the plate-shaped frame near the holding hole is brought into contact with an end surface of one end of the shaft member from the outside. 2. The shaft of the printer according to claim 1, wherein the cut-and-raised portion is a U-shaped cut-and-raised portion that is cut and raised orthogonally to a surface including a holding hole of the plate-shaped frame. Member support structure. 3. The other end of the shaft member is fitted in a concave fitting hole of a bearing bush, and the bearing bush is fitted and fixed in an opening of a plate-shaped frame.
Alternatively, the shaft member support structure of the printer according to claim 2. 4. The plate-shaped frame has a frame main body portion parallel to the shaft member, and a pair of support frames rising perpendicularly from both ends of the frame main body portion, and one of the support frames has a holding hole. 4. A carriage having a print head mounted thereon is movably supported by a shaft member while forming an opening in the other support frame.
A shaft member support structure for a printer according to item 1. 5. A guide flange is formed on the frame main body, the guide flange being separated from the shaft member by a predetermined distance and parallel to the shaft member, the guide flange movably guiding a carriage movably supported by the shaft member. 5. The method according to claim 4, wherein
A shaft member support structure for a printer according to item 1. 6. The shaft member support structure for a printer according to claim 4, wherein the print head is an ink jet print head that prints by ejecting ink from nozzles.