JP2013002584A - Feeding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeding mechanism capable of feed-driving a coil body even in a condition wherein a shaft body is curved.SOLUTION: This feeding mechanism includes: a shaft body formed from a plurality of spirally wound strands; and a coil body formed from a single coil strand spirally wound around an outer peripheral surface of the shaft body. The winding direction of the plurality of strands and the winding direction of the single coil strand are the same direction. The shaft body includes a plurality of spiral valley parts formed between the strands, and the coil body includes a plurality of peak parts formed on the coil strand. At least one valley part and at least one peak part are engaged with each other, and the coil body is formed to be feed-driven between end parts of the shaft body by rotating the shaft body.

Description

The present invention relates to a feed mechanism.

Conventionally, as a type of feed mechanism that feeds and moves a transported object, it consists of a shaft shaft body that functions as a screw shaft and a nut body that is formed with a thread, and the shaft shaft body and the nut body are screwed together. A screw mechanism is known.

In the conventional feed screw mechanism, the transported material on the nut body can be fed and moved by converting the rotational motion of the shaft body into the linear motion of the nut body.

As such a conventional feed screw mechanism, for example, in Patent Document 1, a feed screw including a screw shaft shaft body formed by twisting a plurality of wires and a cylindrical feed member having a pin attached to an inner surface is disclosed. A feed screw mechanism is disclosed which is a mechanism in which a screw groove portion of a screw shaft shaft body and a pin of a feed member are screwed together.

Japanese Patent Laid-Open No. 11-13367

The conventional feeding mechanism described in Patent Document 1 is supposed to be able to feed and move the feeding member even when the screw shaft shaft is curved.

However, in the conventional feed mechanism described in Patent Document 1, the screw shaft shaft body is flexible because a plurality of wires are twisted together, but the feed member on which the pin is formed is made of resin or the like and is not flexible. .
Therefore, in a relatively loosely curved state, the screw shaft shaft body and the feed member can be screwed and moved to move, but when the curve becomes tight, the outer curved portion of the screw shaft shaft body has a screw groove portion. Since the pitch is widened and the pitch of the screw groove portion is narrowed in the inner curved portion, there is a problem that the screw groove portion and the pin are difficult to be screwed together and are difficult to move.

As a result of the intensive studies by the present inventors to solve the above-mentioned problems, even if the shaft member and the feed member are used in a curved state by forming the feed member from a flexible coil body, a good feed can be obtained. The inventors found that they can be moved and completed the feeding mechanism of the present invention.

That is, the feed mechanism of the present invention includes a shaft body formed of a plurality of strands wound in a spiral shape,
A feeding mechanism comprising a coil body formed from a single coil wire spirally wound on the outer peripheral surface of the shaft shaft body,
The winding direction of the plurality of strands and the winding direction of the single coil strand are the same,
The shaft shaft body has a plurality of spiral valleys formed between the strands,
The coil body has a plurality of crests formed on the coil wire,
At least one of the valleys and at least one of the peaks are fitted,
By rotating the shaft shaft body, the coil body is formed so as to be able to feed and move between the ends of the shaft shaft body.

The configuration and effects of the feeding mechanism of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view schematically showing a feed mechanism according to the first embodiment of the present invention.
2A is a cross-sectional view taken along line AA of the feed mechanism shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB of the feed mechanism shown in FIG. ) Is a cross-sectional view of the feed mechanism shown in FIG.
FIG. 3 is a plan view schematically showing an example of a usage state of the feed mechanism shown in FIG.

A feed mechanism 1 of the present invention shown in FIG. 1 includes a shaft shaft body 2 formed of a plurality of strands 2 a wound in a spiral shape, and a single spiral wound around the outer peripheral surface of the shaft shaft body 2. It consists of a coil body 3 formed from one coil strand 3a.
Moreover, the winding direction of the some strand 2a and the winding direction of the single coil strand 3a are the same.

As shown in FIGS. 1 and 2 (a) to 2 (c), the shaft shaft body 2 has a plurality of helical valleys 2b formed between the strands 2a, and the coil body 3 Has a plurality of peaks 3b formed on the coil wire 3a.
Further, as shown in FIGS. 2A and 2B, at least one valley 2b and at least one peak 3b are fitted.
In this specification, the term “fitting” refers to a state in which a convex crest fits into a concave trough and is slidably screwed. The trough and the crest are fixed by a fixing means. It does not include a state where it is inserted and cannot be slid.

The feed mechanism 1 of the present invention is formed so that the coil body 3 can be fed and moved between the end portions 2 c and 2 d of the shaft shaft body 2 by rotating the shaft shaft body 2.
Specifically, for example, the shaft shaft body 2 and the coil body 3 are not fixed to each other by fixing means such as welding or brazing, and the valley portion 2b of the shaft shaft body 2 functions as a thread groove portion. The crest 3b of the coil body 3 is formed so as to function like a thread crest, and when the shaft shaft body 2 is rotated, the coil body 3 is between the ends 2c and 2d of the shaft shaft body 2. This means that it can be moved.

In the feed mechanism 1 of the present invention, the shaft body 2 is flexible because it is formed of a plurality of strands 2a wound in a spiral shape, and the coil body 3 is formed of a single coil strand 3a. Because it is flexible.
Therefore, not only in a loose curve state but also in a tight curve state, as shown in FIG. 3, the pitch of the valley portion 2b is widened at the outer curved portion of the shaft shaft body 2, and the pitch of the valley portion 2b is narrowed at the inner curved portion. Even if it is a case, since the pitch of the peak part 3b changes when the coil strand 3a deforms following the deformation | transformation of the shaft shaft body 2, the trough part 2b and the peak part 3b are easy to fit.
Therefore, even if the feeding mechanism 1 of the present invention is used in a curved state, the coil body 3 can be fed and moved well.
In FIG. 3, the rotation direction of the shaft body is indicated by R, and the feed movement direction of the coil body is indicated by r.

Further, in the feed mechanism 1 of the present invention, since the shaft shaft body 2 formed from a plurality of strands 2a functions like a shaft body of a multi-threaded screw, the shaft shaft body formed with a single thread groove is provided. The feed amount can be improved compared to the case of using.

In the feeding mechanism of the present invention, the plurality of troughs are formed apart from each other with the strands interposed therebetween, and the plurality of crests are formed apart from each other with a non-fitting portion interposed therebetween. It is desirable that two or more of the valleys and two or more of the peaks are fitted, and the valley and the non-fitting parts are not fitted.

In the feeding mechanism of the present invention, it is desirable that the one trough and the plurality of crests are fitted by winding the coil body following the one trough.

In the feed mechanism of the present invention, it is desirable that the shaft shaft body is formed of a hollow multi-strand coil body.

It is a front view showing typically the feed mechanism concerning a first embodiment of the present invention. 2A is a cross-sectional view taken along line AA of the feed mechanism shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB of the feed mechanism shown in FIG. ) Is a cross-sectional view of the feed mechanism shown in FIG. It is a top view which shows typically an example of the use condition of the feed mechanism shown in FIG. It is a front view which shows typically the feed mechanism which concerns on 2nd embodiment of this invention.

(First embodiment)
A feed mechanism 1 according to a first embodiment of the present invention will be described below with reference to the drawings.
Since the feed mechanism of the present embodiment has the same configuration as the feed mechanism of the present invention described above, the following description will be given with reference to FIGS.
In addition, about the matter which overlaps with the description which concerns on the feed mechanism of this invention, description may be abbreviate | omitted.

The feed mechanism 1 of the present embodiment shown in FIGS. 1 to 3 has a shaft shaft body 2 formed of eight strands 2 a wound in a spiral shape, and a spiral shape on the outer peripheral surface of the shaft shaft body 2. It consists of a coil body 3 formed from a wound single coil wire 3a.
Moreover, the winding direction of the eight strands 2a and the winding direction of the single coil strand 3a are the same, and it is Z winding.

The shaft shaft body 2 has eight spiral troughs 2b formed between the strands 2a, and the eight troughs 2b are formed so as to be separated from each other with the strands 2a interposed therebetween. Yes.

The coil body 3 has a plurality of crests 3b formed on the coil wire 3a, and the plurality of crests 3b are spaced apart from each other with the non-fitting portion 3c interposed therebetween.
For example, in the cross-sectional view taken along the line AA shown in FIG. 2A, eight ridges 3b are formed per turn of the coil body 3 with the non-fitting portion 3c interposed therebetween.
Since the coil body 3 is spirally wound around the outer peripheral surface of the shaft shaft body 2, the number of peaks is increased or decreased depending on the number of windings. For example, when the coil body 3 is wound twice on the outer peripheral surface of the shaft shaft body 2, the maximum 16 peak portions 3 b are formed on the coil wire 3 a of the coil body 3.

The coil wire 3a of the coil body 3 has one peak 3b fitted into the one valley 2b, and then climbs over one strand 2a, and the other peak 3b adjacent to the one peak 3b is It is wound around the outer peripheral surface of the shaft shaft body 2 in a spiral manner so as to be fitted to another valley portion 2b adjacent to the one valley portion 2b.
Therefore, in the plan view shown in FIG. 1, the line segment L drawn in parallel along the longitudinal axis of the shaft shaft body 2 intersects the line segment l ₁ drawn in parallel along the line axis of one strand 2a. seeking winding angle α of the wires 2a by, the line segment L and the winding angle of the coil wire 3a by crossing a line l ₂ drawn in parallel along the line axis of the coil wire 3a When β is obtained, the winding angle β is larger than the winding angle α and closer to 90 °.
Therefore, looking at the BB line cross-sectional view shown in FIG. 2 (b), the two or more valleys 2b and the two or more peaks 3b are fitted to each other without substantially leaving a space. When the cross-sectional view taken along the line C-C shown in FIG. 2 (c) is seen, the non-fitting portion 3c runs on the strand 2a, and the trough portion 2b and the non-fitting portion 3c are not fitted. A space 4 is formed.

The coil body 3 is wound with three strands 2a as the pitch.
The pitch of the coil body 3 is desirably 2 to 6 wires 2a.
Even when the shaft body is bent, the coil body is likely to follow and bend easily, the pitch of the valleys and the pitch of the peaks are less likely to shift, and the valleys and peaks are more easily fitted. Because.
On the other hand, if the pitch of the coil body is one strand, the coil body pitch is too narrow to follow the curvature of the shaft shaft body, and the coil body pitch is less than the six strands. If exceeded, the coil body becomes too linear (the winding angle β is too close to 0 °), and the coil body is difficult to feed and move on the shaft body.

The feed mechanism 1 of the present embodiment having such a configuration is not only in the non-curved state shown in FIG. 1 and the like, but also in the curved state shown in FIG. 3, the shaft shaft body 2 is rotated by rotating the shaft shaft body 2. The coil body 3 can be fed and moved between the end portions 2c and 2d.
That is, the end portions 2c and 2d of the shaft shaft body 2 are rotatably supported by a support member, and both ends or any one of the end portions are rotated by rotating means such as a servo motor, whereby the end of the shaft shaft body 2 is obtained. The coil body 3 can be fed and moved between the portions 2c and 2d.
For example, in the example shown in FIGS. 1 to 3, when the shaft body 2 is rotated clockwise, the coil body 3 advances in the left direction in the figure. When the shaft shaft body 2 is rotated once, the coil body 3 advances by about one pitch of the strand 2a of the shaft shaft body 2.

The configuration of each member will be described in detail below.
The shaft body 2 is formed of a hollow multi-coil body formed of eight strands 2a wound in a spiral shape.

The strand 2a is a rod-like body having a circular cross section, and the diameter thereof is not particularly limited. The strand 2a has a diameter large enough to form a trough portion 2b that can fit the peak portion 3b. Need to be.

Examples of the material of the strand 2a include superelastic alloys such as stainless steel and Ni—Ti alloy, metals such as tungsten, and synthetic resins such as polyethylene terephthalate (PET).
Examples of the stainless steel include stainless steels such as martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenite, ferrite duplex stainless steel, and precipitation hardened stainless steel.
Among these, stainless steel is desirable, and austenitic stainless steel is more desirable.

The number of the strands 2a is not limited to 8 and may be, for example, 2 to 10.

The coil body 3 is formed of a single coil wire 3a, and the coil wire 3a is a rod-shaped body having a circular cross section.
The diameter of the coil wire 3a only needs to have a diameter that can be fitted to the valley 2b. For example, the diameter of the coil wire 3a may be substantially the same as the diameter of the wire 2a, or the wire 2a The diameter may be slightly smaller than the diameter.

The material of the coil wire 3a may be the same material as that of the above-described wire 2a.

The feed mechanism of this embodiment uses a twisted wire machine or the like to wind a plurality of circular cross-sectional strands around the core material in a spiral shape, and then remove the core material to remove the shaft shaft body. Produced by spirally winding a coil body made of a single coil wire around the manufactured shaft shaft so that the winding angle β is larger than the winding angle α. Can do.

The effects of the feed mechanism of this embodiment are listed below.

(1) Since the shaft mechanism and the coil body of the feed mechanism of this embodiment are flexible, the coil wire deforms following the deformation of the shaft body even if it is used in a tightly curved state. Since the pitch of the peak changes, the fitting between the valley and the peak is difficult to shift.
Therefore, even if the feed mechanism of this embodiment is used in a curved state, the coil body can be fed and moved well.

(2) Since the shaft shaft body formed from a plurality of strands functions like a shaft body of a multi-threaded screw, the feed amount can be reduced compared to the case where a shaft shaft body formed with a single thread groove is used. Can be improved.

(3) Since two or more valleys and two or more peaks are fitted, there are many fitting parts, and the coil body can be reliably fed and moved.

(4) Although two or more troughs and two or more crests are fitted to each other, the troughs and the non-fitting parts are not fitted, and the shaft shaft body and the coil body are not fitted. Since the space (play) is partially formed, the shaft body is used with a large curvature compared to the case where the entire coil body (coil wire) is fitted in one valley without any gap. Even so, the coil body can be fed and moved more smoothly.

(5) Since the shaft body is formed of a hollow multi-strip coil body, it is more flexible and easy to bend.

(6) It is possible to use by inserting a wire such as a conductive wire or an optical fiber into the shaft shaft body.

(Second embodiment)
The feed mechanism of this embodiment is the same as that of the first embodiment described above except that the coil body is wound following the one valley and the one valley and the plurality of peaks are fitted. Because of this configuration, description of overlapping items may be omitted.
Hereinafter, the feeding mechanism of this embodiment will be described with reference to the drawings.

FIG. 4 is a front view schematically showing a feed mechanism according to the second embodiment of the present invention.

The feed mechanism 10 according to the present embodiment shown in FIG. 4 is spirally wound around the shaft shaft body 20 formed from a plurality of strands 20a wound in a spiral shape and the outer peripheral surface of the shaft shaft body 20. And a coil body 30 formed from a single coil wire 30a.
Moreover, the winding direction of the some strand 20a and the winding direction of the single coil strand 30a are the same.

The shaft body 20 has eight spiral valleys 20b formed between the strands 20a, and the coil body 30 has a plurality of peaks 30b formed on the coil strands 30a. ing. The plurality of peak portions 30b are continuously formed over the entire coil strand 30a from one end of the coil strand 30a to the other end. That is, the plurality of peak portions 30b are the outer peripheral surface of the coil wire 30a itself.
In addition, the coil body 30 is wound around the one valley portion 20b among the eight valley portions 20b, and the one valley portion 20b and the plurality of mountain portions 30b are fitted.

The feed mechanism 10 of the present invention is formed such that the coil body 30 can be moved between the ends 20c and 20d of the shaft shaft body 20 by rotating the shaft shaft body 20.

In the feed mechanism of this embodiment, a shaft shaft body is manufactured in the same manner as the method described in the first embodiment, and the entire coil body made of a single coil wire is arranged in one valley around the manufactured shaft shaft body. It can manufacture by winding a coil body helically so that it may fit in a part.

The effects of the feed mechanism of this embodiment are listed below.
Even in the feed mechanism of this embodiment, the effects (1) to (2) and (5) to (6) of the feed mechanism according to the first embodiment can be exhibited, and the following effects (7) can be obtained. It can be demonstrated.

(7) Since one trough portion and a plurality of peak portions (entire coil body) are fitted, rotating the shaft shaft body causes the coil body to feed and move between the ends of the shaft shaft body. The torque can be increased, and even a heavier material can be easily fed and moved.

(Other embodiments)
In the feed mechanism of the present invention, the embodiment provided with one coil body in the feed mechanism according to each of the above-described embodiments has been described, but the number of coil bodies is not limited to one and may be plural. . For example, the number of coil bodies may be 2-4.
When the number of coil bodies is plural, adjacent to one coil body wound on the outer peripheral surface of the shaft shaft body, the position of the shaft shaft body is shifted in the longitudinal direction and another coil body is wound. That's fine.
When the number of coil bodies is plural, the torque can be further increased.

The feed mechanism according to the present invention may further include a moving body that can house the coil body.
In this case, the moving body is equipped with a coil body, and the moving body and the coil body are fixed by a fixing means, so that the rotational movement of the shaft body is converted into the horizontal movement of the moving body, and the carriage is mounted on the moving body. You can feed and move things.
Examples of the fixing means include screwing, welding, brazing, and the like.

1, 10 Feed mechanism 2, 20 Shaft shaft 2a, 20a Wire 2b, 20b Valley 2c, 2d, 20c, 20d Shaft shaft end 3, 30 Coil 3a, 30a Coil 3b, 30b Mountain

Claims (4)

A shaft body formed of a plurality of strands wound in a spiral,
A feeding mechanism comprising a coil body formed of a single coil wire spirally wound around the outer peripheral surface of the shaft shaft body,
The winding direction of the plurality of strands and the winding direction of the single coil strand are the same,
The shaft shaft body has a plurality of spiral valleys formed between the strands,
The coil body has a plurality of crests formed on the coil wire,
At least one of the valleys and at least one of the peaks are fitted,
A feed mechanism in which the coil body is formed so as to be movable between ends of the shaft shaft body by rotating the shaft shaft body. The plurality of valleys are formed to be separated from each other with the strands interposed therebetween,
The plurality of peak portions are formed apart from each other across the non-fitting portion,
Two or more valleys and two or more peaks are respectively fitted,
The feed mechanism according to claim 1, wherein the valley portion and the non-fitting portion are not fitted. The feed mechanism according to claim 1, wherein the coil body is wound so as to follow the one valley and the one valley and the plurality of peaks are fitted. The feed mechanism according to any one of claims 1 to 3, wherein the shaft body is formed of a hollow multi-row coil body.

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