JP2937182B2 - bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high grade of printing quality by a method wherein a bearing to support a shaft is formed in a triangular shape and a backlash between a carrier and a shaft is reliably prevented from occurring through slide contact of the outer periphery of a shaft with the three surfaces of the inner walls of a triangular cylinder. SOLUTION: This bearing is a cylindrical bearing through which a shaft 30 is inserted with the shaft inserted through a bearing holding part 21 on the carrier 20 side moved along the shaft 30. A whole is formed on a triangular cylindrical state approximately in an equilateral triangle in cross section. One apex 10a of the triangular cylindrical bearing is opened, the whole of a bearing has spring characteristics, and an inner wall is provided with a slide part 12 formed of a resin layer. Triangular apexes 10a, 10b, and 10c are brought into contact in a state to be pressed in the inner wall surface of the bearing holding part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing in a serial printer or the like, which is inserted into a carrier moving along a shaft and through which the shaft is passed. The present invention relates to a bearing capable of realizing high printing quality by reliably preventing backlash between a carrier and a shaft by slidably contacting an outer periphery of a shaft with three inner walls of a cylinder.

[0002]

2. Description of the Related Art In general, a carrier equipped with a printing unit in a serial printer or the like is designed to move along a shaft to perform printing.
A bearing is provided through which the shaft passes.

When the carrier on which the printing unit is mounted reciprocates, a bearing is interposed between the carrier and a shaft for guiding the movement of the carrier so that the carrier can be smoothly moved.

FIGS. 8 and 9 show a conventional carrier provided with a bearing through which such a shaft is passed. FIG.
It is a schematic perspective view showing a carrier provided with a conventional bearing,
FIG. 9 is an enlarged side view of a main part of the conventional carrier shown in FIG. 8, showing a relationship between a shaft and a bearing.

The conventional carrier 120 shown in these figures
Is a cylindrical bearing 110 through which a cylindrical shaft 130 is inserted, and a bearing holding portion 12 into which the bearing 110 is inserted.
1 by receiving a driving force from a stepping motor (not shown) via a timing belt.
It moves along the shaft 130. As shown in FIG. 8, a frame 122 for holding the ink cartridge is provided on the upper surface side of the carrier 120 in the drawing.

As shown in FIG. 9, the bearing holding portion 121 formed on the carrier 120 has an inner diameter substantially the same as the outer diameter of the bearing 110 so that the cylindrical bearing 110 can be fitted in a press-fit state. It has a cylindrical hole.

[0007] The bearing 110 is a cylindrical member through which the shaft 130 slides in a sliding state, and is formed by bending a metal plate into a cylindrical shape having an inner diameter substantially equal to the outer diameter of the shaft 130. A sliding member 112 made of a resin or the like is provided on the inner wall surface of the base member 111 by coating, bonding, or the like.

According to the carrier having the conventional bearing having such a configuration, the carrier 12 including the bearing 110 is guided by the shaft 130 that is axially passed through the bearing 110.
By sliding the entirety along the axial direction of the shaft 130, a printing operation required as a printer can be performed.

At this time, since the sliding member 112 is disposed on the inner wall surface of the bearing 110, the sliding member 112 and the shaft 1
The sliding contact with the outer peripheral surface of the carrier 30 is performed smoothly,
Can move smoothly along the shaft 130.

[0010] Various techniques relating to a carrier having such a bearing have been proposed and disclosed so far. For example, a liquid jet recording apparatus described in Japanese Patent Publication No. 4-72699 is known. I have.

[0011]

However, since the conventional bearings as described above are all formed in a cylindrical shape having a circular cylindrical cross section, the contact with the shaft can be performed with high dimensional accuracy. Even if it is kept, a gap is formed due to the weight of the carrier and the like, and the contact point becomes one place (the vertex shown in FIG. 9), and the vertex receives the full load.

On the other hand, in this type of bearing, it is necessary to provide a certain clearance between the bearing and the shaft because it is necessary to absorb a dimensional change of the bearing inner diameter due to a temperature change or the like.

[0013] For this reason, in the bearing provided in the conventional carrier, a certain gap is always generated between the bearing and the shaft, and the backlash is generated when the carrier is moved, and the character is shaken at the time of printing. The problem that the print quality is deteriorated occurs, and in particular, such a problem is remarkable in an impact type dot printer or the like.

The present invention has been proposed in order to solve the problems of the prior art, and in a serial printer or the like, a shaft provided on a carrier moving along the shaft is provided so that the shaft passes through the shaft. The entire bearing is configured in a triangular cylindrical shape, and by sliding the inner wall surfaces of the triangular cylindrical tube into contact with the shaft, it is possible to reliably prevent rattling between the carrier and the shaft and to achieve high printing quality. in particular for the purpose of providing suitable bearing impact type printer.

[0015]

In order to achieve the above object, a bearing according to a first aspect of the present invention is inserted into an insertion portion on a carrier side that moves along a shaft, and the shaft is inserted through the shaft. A cylindrical bearing with a triangular cross section
It is configured to be bent so as to form a triangular cylindrical shape with the entire opening at one top .

[0016] sliding contact according to the bearing of the present invention having such a configuration, since the bearing is formed in a cylindrical shape forming a cross section substantially equilateral triangle, the outer peripheral three locations respectively on the inner wall three sides of the triangular tube shaft Line contact can be made in the state.

[0017] Thus, since the three locations on the outer periphery of the shaft are supported in line contact with the three surfaces of the inner wall of the bearing, there is no play between the shaft and the bearing when the carrier reciprocates. Even when the carrier passing through the shaft is lowered by its own weight, the shaft is supported in line contact with at least two surfaces of the inner wall of the bearing. Does not occur.

By making the bearing a triangular cylinder,
Around the shaft in a state where the shaft is passed through the bearing, there is a space toward each top of the bearing except for the contact portion with the inner wall of the bearing.

[0019] This makes it easy to assemble the shaft through the shaft and the like, and because of this space, the air cooling effect on the bearing is improved, and it can be used as a wiring or other storage space.

Furthermore, the bearing of the present invention is a structure which is open one top side of the triangular tubular bearing, also, the triangular tubular bearing, is configured to have a spring property.

According to the bearing of the present invention having such a structure, by an elastic open the one top side of the bearing, together with the fitting挿作industry easily to the carrier side of the bearing, of the bearing The wall surface can always be brought into elastic contact with the outer periphery of the shaft, and it is possible to eliminate the interference between the bearing and the shaft.

In addition, since one top side of the bearing is open and has a top side having elasticity, even if the dimensions of the bearing or the shaft change due to expansion or contraction due to, for example, a temperature change, the opening of the opening is formed. Since the dimensional change can be absorbed within the range of the elastic change, the dimensional accuracy in the manufacture of the bearing, the shaft and the like is eased, and it is not necessary to provide a clearance or the like as in the related art.

Furthermore, the bearing of the present invention, the triangular tubular bearing, a configuration equipped with sliding member to the inner wall.

According to the bearing of the present invention having such a configuration, the sliding member made of a resin layer or the like provided in the bearing inner wall,
By utilizing the spring property of the bearing, the outer periphery of the shaft can be brought into contact with the shaft in a pressure-contact state, so that the shaft and the bearing can slide smoothly, and a smoother movement of the carrier can be realized.

[0025]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First Embodiment First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic perspective view showing a carrier provided with a bearing according to the present embodiment, and FIG. 2 is an overall perspective view of the bearing according to the present embodiment. Also, FIG.
FIG. 4 is a partial cross-sectional side view showing a state in which a shaft is passed through the bearing shown in FIG. 1. FIG.

As shown in these figures, the bearing of the present embodiment is formed by bending the back metal material into a triangular cylindrical shape so that the cross section thereof becomes substantially equilateral triangular, thereby forming the bearing 10. A round rod-shaped shaft 30 that is axially passed through the inside of the cylinder of the bearing 10 is brought into line contact with the inner wall surface of the bearing 10 at three locations (at least two locations) on the outer periphery.

[0027] Specifically, the bearing 10 of the present embodiment is fitted on the carrier 20 side provided with the printing unit in the serial printer, a bearing member in which the shaft 30 is passed through the shaft in the center.

The carrier 20 has a bearing holding portion 21 into which the bearing 10 is inserted. The carrier 20 is mounted and supported on the shaft 30 via the bearing holding portion 21 and the bearing 10.

Then, by receiving a driving force from a stepping motor (not shown ) via a timing belt, the entire carrier 20 is guided by the shaft 30 and moves along the axial direction of the shaft 30 to perform a necessary printing operation. It is supposed to do. As shown in FIG. 1, a frame 22 for holding an ink cartridge (not shown) is provided on the upper surface side of the carrier 20.

[0030] Here, the bearing retaining portion 21 formed on the carrier 20 side, as shown in FIG. 4, as the bearing 10 which is bent formed substantially equilateral triangle of the tubular to be described later can be inserted fitted with pressed-in condition it has, are a structure having a triangular cylindrical hole of substantially the same shape as the outer shape of the bearing 10.

As shown in FIG. 4, the bearing holding portion 21 has one surface of the bearing 10 (the surface facing a top side 10 a having an opening described later) fitted along the front side wall portion of the carrier 20. It is arranged to be arranged. By forming the bearing holding portion 21 in this way, even if the bearing 10 is formed in a triangular cylindrical shape, the top side does not protrude from the carrier 20.

The bearing 10 according to the present embodiment comprises:
This is a tubular member that is fitted into the bearing holding portion 21 on the carrier 20 side and through which the shaft 30 is axially inserted. As shown in FIG. 2, the entire member has a triangular tubular shape. The outer periphery of the shaft 30 slides on three surfaces (at least two surfaces) of the inner wall of the triangular cylinder of the bearing 10 in a line contact state.

[0033] Specifically, the bearing 10 of the present embodiment, the adhesive resin layer on one surface of the strip-like metal plate, a coated so-called back metal material in which a sliding material, by bending by pressing , Three top sides 10a, 10
It is formed in a triangular cylindrical shape having b and 10c.

[0034] Then, the metal plate portion of the back metal material, constitutes a holder 11 shown in FIG. 2, the inner wall surface disposed a sliding member portion of the holder 11, the sliding portion shown in FIG. 2 12. Thus, the bearing 10 forms the main body of the bearing with the holder 11 and the sliding portion 12 made of a resin layer.
Can be brought into line contact with the outer periphery of the shaft 30, eliminating friction between the shaft 30 and the bearing 10.

[0035] Here, the triangular cylinder of the bearing 10, the outer periphery of the shaft 30 which is passed through the shaft is formed so that the inscribed circle of the sliding portion 12 of the bearing 10. Specifically, as shown in FIG.
The bearing 10 is formed in a cylindrical shape having a substantially equilateral triangular cross section as a whole. In the present embodiment, the bearing 10 is sized so that the outer periphery of the shaft 30 is in line contact with each of the three inner walls of the triangular cylinder in a sliding contact state. It is.

[0036] Thus, the shaft 30 is made to be supported in line contact with the inner wall three-sided bearing 10 at three positions of the outer periphery, as described later, even when the carrier 20 is reciprocated, the shaft 30 and the bearing 10 No rattling occurs between them.

[0037] On the other hand, as shown in FIG. 3, around the shaft 30 in a state of being passed through the shaft to the bearing 10, other than the contact portion between the inner wall of the bearing 10, the top sides 10a of the bearing 10, 10
A space exists toward b and 10c.

[0038] Thus, with can be easily assembled work axis through such a shaft 30, the presence of this space, cooling effect is improved with respect to the bearing 10, it is possible to use as a wiring other storage space.

In such a bearing 10, even if the carrier 20 through which the shaft 30 passes is lowered by its own weight, the shaft 30 is supported in line contact with at least two surfaces of the inner wall of the bearing 10. (See FIG. 4), the two-point support does not cause rattling unlike a conventional carrier.

In order to uniformly apply the load due to the weight of the carrier 20 to the shaft 30, the position of the bearing 10 is determined by setting the top of the triangular cylinder to the shaft 30.
The bearing 10 of the present embodiment may be disposed on the carrier 20 side.

[0041] Furthermore, the bearing 10 consisting of the triangular tube, the
Since the band-shaped metal plate is bent, one top side 10a is opened, whereby the entire bearing 10 has a spring property, and a spring portion 13 having a spring property near the opening is formed. doing. Therefore, the holder 1 of the bearing 10
As a metal plate constituting 1, a leaf spring having excellent spring properties,
It is preferable to use a steel plate.

[0042] Thus, by one top edge 10a side of the bearing 10 constitutes a spring portion 13 having elasticity is open, with fitted挿作industry easily to the carrier 20 side of the bearing 10, the bearing 10 Shaft 30 on inner wall
The outer periphery of the shaft can always be brought into line contact with elasticity, so that the bearing 10 and the shaft 30 can be fitted with each other. Therefore, it is preferable that the triangular cylinder of the bearing 10 having such a spring property is formed so that the inscribed circle is slightly smaller than the outer peripheral circle of the shaft 30 through which the shaft passes.

Further, as shown in FIG.
According to the bearing 10 having a spring property as a whole, even if the dimensions of the bearing 10 and the shaft 30 change due to expansion and contraction due to a temperature change or the like, the spring portion 13 can be used.
The dimensional change can be absorbed within the range of the elastic change such as described above. As a result, the dimensional accuracy in manufacturing the bearing 10 and the shaft 30 and the like is reduced, and it is not necessary to provide a clearance or the like as in the related art.

[0044] Incidentally, the bearing 10 of the present embodiment, since that is formed by bending a strip-shaped metal plate, one top edge 10a of the naturally triangular tube is opened, and the whole has elasticity In other words, the bearing 1 is formed by other methods, for example, by integrally forming a resin-made triangular cylinder by integral molding.
It is also possible to form 0, in which case,
As long as an opening is provided at least on one top side of the triangular cylinder and the whole has a certain elasticity, the same effect as that of the present embodiment can be obtained.

The bearing 10 having such a configuration is
As described above, each of the top sides 10a, 10b,
10c comes into contact with the inner wall surface of the bearing holding portion 21 on the carrier 20 side in a press-fit state.

[0046] Here, the bearing 10 and the bearing holding portion 21, as shown in FIG. 4, the top edges 10a of the bearing 10, 10
The b and 10c are in contact with the three tops of the inner periphery of the bearing holding portion 21 formed in a substantially equilateral triangle shape in a press-fit state. Thereby, the bearing 10 is mounted on the bearing holding portion 2.
It is supported on three sides in 1 and is firmly fixed.

At this time, the size of the bearing holding portion 21 is adjusted so that a slight gap is formed between the three outer circumferential surfaces of the bearing 10 and the three inner circumferential surfaces of the bearing holding portion 21.
It is formed slightly larger. Thus, the work of inserting the bearing 10 into the bearing holding portion 21 can be easily performed, and a space exists around the bearing 10, so that the air cooling effect on the bearing 10 can be ensured.

Next, the operation of the carrier with the bearing of the present embodiment having such a configuration. The carrier 20 on which the printing unit and the like are mounted receives the power from the stepping motor via the timing belt, and performs a reciprocating operation on the shaft 30. In the drawings according to the present embodiment, the printing unit, the stepping motor, and the timing belt are omitted because they are not directly related to the gist of the present invention.

The bearing 10 includes a bearing holding portion 2 of the carrier 20.
1 and is fixed in a press-fitted state.
Slides on the outer periphery of the shaft 30, and the carrier 20 slides on the shaft 30.

The portion of the shaft 30 that slides on the inner wall of the bearing 10 is elastically pressed against the sliding portion 12 by the elasticity of the entire bearing 10, so that rattling occurs between the shaft 30 and the bearing 10. However, the carrier 20 moves smoothly, and an accurate printing operation is performed.

[0051] Thus, in the serial printer, it prevents the bearing 10 with Nigata the shaft 30 and the carrier 20 occurs, characters deflection and no character distortion high quality printing can be obtained, in particular printed by mechanical impact It is suitable for an impact type printer to be used.

[0052] According to the the present embodiment, the bearing 1
Since 0 is formed in a cylindrical shape that forms an approximately equilateral triangle,
The outer periphery of the shaft 30 can be brought into linear contact with each of the three inner walls of the triangular cylinder in a sliding contact state.

[0053] Thus, by the outer peripheral three positions of the shaft 30 is supported in line contact on three sides of the inner wall of the bearing 10, when the carrier 20 reciprocates also rattling between the shaft 30 and the bearing 10 Does not occur.

The carrier 2 passing through the shaft 30
Even if the zero is lowered by its own weight, the shaft 30 is supported in line contact on at least two surfaces of the inner wall of the bearing 10, and thus the two-point support does not cause rattling unlike a conventional carrier.

[0055] Further, by the bearing 10 and triangular tubular, around the condition of the shaft 30 through the shaft into the bearing 10, the top sides 10a of the bearing 10, 10b, since the space exists towards 10c Also, the air cooling effect on the bearing 10 is improved, and the bearing 10 can be used as a wiring or other storage space.

[0056] Incidentally, the bearing 10 of the present embodiment described above,
It is formed in the shape of a triangular cylinder with a regular triangular cross section. Even if a spring property is provided, substantially the same effect as in the case of the present embodiment can be obtained.

[0057] Second Embodiment Next will be described with reference to FIGS. 5 and 6 for the second embodiment of the bearing of the present invention. FIG. 5 is a schematic perspective view showing a carrier provided with the bearing according to the second embodiment of the present invention, and FIG. 6 is an enlarged side view of a main part of the carrier provided with the bearing shown in FIG.

As shown in these drawings, the bearing of the present embodiment is obtained by changing the shape of the bearing holding portion 21 on the carrier 20 side into which the bearing 10 of the above-described first embodiment is inserted. Has the same configuration. Therefore, for parts common to the first embodiment,
The same reference numerals are given and detailed description is omitted.

[0059] That is, in this embodiment the bearing holder 21
Is shaped to ensure a large space around the bearing 10 in the fitted state. Specifically, as shown in FIG. 6, the bearing holding portion 21 has a hole having an inside diameter into which each of the top sides 10a, 10b, and 10c of the equilateral triangular cylindrical bearing 10 can be fitted in a press-fit state. I have.

As in the case of the first embodiment, the hole of the bearing holding portion 21 is formed such that one surface of the bearing 10 (the surface facing the top side 10 a having the opening) is perpendicular to the shaft 30. At the same time as the shape arranged along, the surface other than the vertical surface has a shape bulging outward, and as a whole, it has a substantially semi-long hole shape.

[0061] According to the bearing holding portion 21 having such a shape, as compared with the case of the first embodiment described above, the bearing 10
A larger space exists around the space, and the effect of the first embodiment can be further improved.

[0062] That is, by the large space, with fitted work of the bearing 10 to the bearing holder 21 is further easily, it is possible to secure a larger cooling effect on the bearing 10. In addition, it is also possible to store wiring and cloth impregnated with a lubricant such as oil in this space, so that space saving and smoother movement of the carrier 20 can be realized.

When the bearing holding portion 21 is configured from the viewpoint of forming a larger space around the bearing 10 as described above, the bearing holding portion 21 is not limited to the above-described semi-long hole shape, and various deformed elements may be used. It is possible.

[0064] For example, as shown in FIG. 7, the bearing holder 2
The shape of the hole 1 may be a perfect circle, or any shape such as an ellipse, an ellipse, or a polygon (not shown) as long as the triangular cylindrical bearing 10 is inserted and fixed in a press-fit state. It may be.

[0065]

As described above, according to the bearing of the present invention, in a serial printer or the like, the entire bearing provided on the side of the carrier moving along the shaft and through which the shaft passes is formed in a triangular cylindrical shape. However, by sliding the inner wall surfaces of the triangular tube in contact with the shaft, it is possible to reliably prevent the carrier and the shaft from rattling, and to realize a high printing quality, which is particularly suitable for an impact type printer.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a carrier provided with a bearing according to a first embodiment of the present invention.

FIG. 2 is an overall perspective view of the bearing according to the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional side view showing a state where a shaft is passed through a bearing shown in FIG. 1;

FIG. 4 is an enlarged side view of a main part of the carrier provided with the bearing shown in FIG. 1;

FIG. 5 is a schematic perspective view showing a carrier including a bearing according to a second embodiment of the present invention.

6 is an enlarged side view of a main part of a carrier provided with the bearing shown in FIG.

FIG. 7 is an enlarged side view of a main part of a carrier including a bearing according to another embodiment of the present invention.

FIG. 8 is a schematic perspective view showing a carrier provided with a conventional bearing.

FIG. 9 is an enlarged side view of a main part of the carrier provided with the conventional bearing shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bearing 11 Holder 12 Sliding part 20 Carrier 21 Bearing holding part 30 Shaft

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16C 29/02 B41J 19/00

Claims (4)

(57) [Claims] 1. A cylindrical bearing, which is inserted into an insertion portion on a carrier side that moves along a shaft and through which the shaft is passed, wherein a plate material is bent so as to have a triangular cross section. Opening the top
A bearing characterized in that the entire mouth is formed in a triangular cylindrical shape. 2. A method according to claim 1 each apex sides of the triangular tubular bearing, which abuts in a pressed state on the inner wall surface of the carrier side inserting portion
The bearing described. Wherein the triangular tubular bearing, the bearing according to claim 1 or 2, wherein a spring property. Wherein said triangular tubular bearing, claim 1 comprising a sliding member on the inner wall or 3 bearing according.