JP7427858B2 - Feed screw clutch mechanism - Google Patents

Feed screw clutch mechanism Download PDF

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JP7427858B2
JP7427858B2 JP2021504092A JP2021504092A JP7427858B2 JP 7427858 B2 JP7427858 B2 JP 7427858B2 JP 2021504092 A JP2021504092 A JP 2021504092A JP 2021504092 A JP2021504092 A JP 2021504092A JP 7427858 B2 JP7427858 B2 JP 7427858B2
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隼人 杉江
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
    • F16H25/14—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation perpendicular to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Description

本発明は、送りねじからの送り対象物に対する動力の伝達を断続する送りねじクラッチ機構に関する。 The present invention relates to a feed screw clutch mechanism for intermittent transmission of power from a feed screw to an object to be fed.

従来、送りねじからの送り対象物に対する動力の伝達を断続する機構として、ハーフ部材を用いたものが知られている（例えば、特許文献１参照）。この特許文献１の機構では、第１、第２ハーフ部材を、これらが送りねじと螺合する送りナットを形成する第１位置と、これらが相互に離間して該送りねじとの螺合が解除される第２位置との間で両者の位置が切り替えられるようになっている。 BACKGROUND ART Conventionally, a mechanism using a half member is known as a mechanism for intermittent transmission of power from a feed screw to an object to be fed (for example, see Patent Document 1). In the mechanism of Patent Document 1, the first and second half members are arranged at a first position where they form a feed nut that is screwed together with a feed screw, and at a first position where they are spaced apart from each other so that they are not screwed together with the feed screw. Both positions can be switched between the second position and the second position, which is released.

第１、第２ハーフ部材は、それぞれ略クランク状に形成されており、その先端部には、送りねじの半周部分に対応する部分を構成するねじ面が形成され、後端部には、カムの動作を第１、第２ハーフ部材に伝達させるためのカム従動面が形成される。また、第１、第２ハーフ部材の中央部は、相互に開閉し得るように、支軸によって支持される。第１、第２ハーフ部材の支軸とねじ面との中間位置には、第１、第２ハーフ部材を閉鎖方向に付勢する引っ張りばねが設けられる。 The first and second half members are each formed into a substantially crank shape, and a threaded surface that corresponds to the half circumference of the feed screw is formed at the tip thereof, and a cam is formed at the rear end. A cam driven surface is formed to transmit the motion of the cam to the first and second half members. Further, the central portions of the first and second half members are supported by a support shaft so that they can be opened and closed mutually. A tension spring that biases the first and second half members in the closing direction is provided at an intermediate position between the support shaft and the threaded surface of the first and second half members.

したがって、この機構においては、引っ張りばねの付勢力に抗して、第１、第２ハーフ部材が開く方向にカムを動作させることによって、送りねじから送り対象物に対する動力の伝達が切断された切断状態とすることができる。逆に、カムを第１、第２ハーフ部材が付勢力によって閉じる方向に動作させることにより、送りねじから送り対象物に対する動力の伝達が可能な接続状態とすることができる。 Therefore, in this mechanism, by operating the cam in the direction in which the first and second half members open against the biasing force of the tension spring, the transmission of power from the feed screw to the object to be fed is cut off. It can be a state. Conversely, by moving the cam in the closing direction by the biasing force of the first and second half members, a connected state can be established in which power can be transmitted from the feed screw to the object to be fed.

特許第４４５２４００号公報Patent No. 4452400

しかしながら、特許文献１の機構によれば、第１、第２ハーフ部材が、第１位置と第２位置との間でクリップ状に開閉動作することによって送りねじからの送り対象物に対する動力の伝達を断続する機構となっている。このため、この動力伝達を断続するためには第１、第２ハーフ部材がクリップ状に開閉動作するためのスペースを確保する必要がある。 However, according to the mechanism disclosed in Patent Document 1, the first and second half members open and close in a clip-like manner between the first position and the second position, thereby transmitting power from the feed screw to the object to be fed. It is a mechanism that intermittents. Therefore, in order to intermittent the power transmission, it is necessary to secure a space for the first and second half members to open and close in a clip-like manner.

本発明の目的は、かかる従来技術の課題に鑑み、よりコンパクトなスペース内で動作可能な送りねじクラッチ機構を提供することにある。 In view of the problems of the prior art, an object of the present invention is to provide a feed screw clutch mechanism that can operate within a more compact space.

本発明の送りねじクラッチ機構は、
送りねじにより送り方向に送られる送り対象物と該送りねじとの間の動力の伝達を断続する送りねじクラッチ機構であって、
少なくとも一方がハーフナットを構成する第１、第２ハーフ部材と、
前記第１、第２ハーフ部材をそれぞれ支持し、該第１、第２ハーフ部材が相互に近接して前記送りねじと螺合する送り部を形成する第１位置と、該第１、第２ハーフ部材が相互に離間して該送りねじとの螺合が解除される第２位置との間で併進移動し得るように互いに案内し合う第１、第２支持部材と、
前記第１、第２支持部材を、前記第１、第２位置の間で併進移動し得るように収容するとともに前記送り対象物に固定されたケース部と、
前記第１、第２支持部材を前記第１、第２位置の間で併進移動させる切替手段とを備え、
前記切替手段は、
前記第１、第２支持部材を、前記第１位置又は前記第２位置に向かう方向に付勢する付勢部材と、
前記第１支持部材又は第１ハーフ部材に設けられた第１面と前記第２支持部材又は第２ハーフ部材に設けられて該第１面と対向する第２面との双方に接して回転することにより該第１、第２面間の間隔を増減させるカム面を有し、該間隔の増減により前記第１、第２支持部材を前記第１、第２位置の間で移動させるカム部材とを備えることを特徴とする。 The feed screw clutch mechanism of the present invention includes:
A feed screw clutch mechanism for intermittent transmission of power between an object to be fed in a feed direction by a feed screw and the feed screw,
first and second half members, at least one of which constitutes a half nut;
a first position that supports the first and second half members, and where the first and second half members are close to each other to form a feed portion that is threadedly engaged with the feed screw; first and second support members that guide each other so that the half members can move in translation between a second position where the half members are separated from each other and the threaded engagement with the feed screw is released;
a case portion that accommodates the first and second support members so as to be movable in translation between the first and second positions and is fixed to the object to be fed;
switching means for translating the first and second support members between the first and second positions,
The switching means is
a biasing member that biases the first and second support members in a direction toward the first position or the second position;
Rotates in contact with both a first surface provided on the first support member or first half member and a second surface provided on the second support member or second half member and facing the first surface. a cam member that has a cam surface that increases or decreases the distance between the first and second surfaces, and that moves the first and second support members between the first and second positions by increasing or decreasing the distance; It is characterized by having the following.

この構成において、送りねじにより送り対象物を送るためには、カム部材を第１、第２面間の間隔が増大し又は減少する方向に回転させることにより、第１、第２支持部材を第１位置に併進移動させる。これにより、第１、第２ハーフ部材は、送り部を形成して送りねじと螺合した状態となる。すなわち、送りねじクラッチ機構は、送り対象物と送りねじとの間の動力の伝達が可能な接続状態となる。 In this configuration, in order to send the object to be fed by the feed screw, the cam member is rotated in a direction in which the distance between the first and second surfaces increases or decreases, thereby moving the first and second support members to the second surface. Translate to position 1. As a result, the first and second half members form a feed portion and are in a state in which they are screwed together with the feed screw. That is, the feed screw clutch mechanism is in a connected state in which power can be transmitted between the object to be fed and the feed screw.

また、この状態において、カム部材を、上述の第１、第２支持部材を第１位置に併進移動させる場合とは逆方向に回転させて、第１、第２支持部材を第２位置に併進移動させることにより、第１、第２ハーフ部材は、送りねじとの螺合が解除された状態となる。すなわち、送りねじクラッチ機構は、送りねじからの送り対象物に対する動力の伝達が不能な切断状態となる。 In this state, the cam member is rotated in the opposite direction to the case where the first and second support members are translated to the first position, and the first and second support members are translated to the second position. By moving the first and second half members, the threaded engagement with the feed screw is released. That is, the feed screw clutch mechanism is in a disconnected state in which power cannot be transmitted from the feed screw to the object to be fed.

このように、本発明によれば、第１、第２支持部材を、第１、第２ハーフ部材の螺合面が対峙する姿勢で併進移動させることにより、第１、第２支持部材の位置が第１、第２位置間で切り替えられ、送りねじからの送り対象物に対する動力の伝達が断続される。このため、第１、第２支持部材は、動力伝達の断続に際してクリップ状に開閉動作することはない。 As described above, according to the present invention, the positions of the first and second support members can be adjusted by moving the first and second support members in translation with the screwing surfaces of the first and second half members facing each other. is switched between the first and second positions, and transmission of power from the feed screw to the object to be fed is interrupted. Therefore, the first and second support members do not open or close like a clip when power transmission is interrupted or interrupted.

したがって、本発明によれば、第１、第２支持部材をクリップ状に開閉方向に動作させるためのスペースが不要であり、第１、第２支持部材を、第１、第２位置との間で相互に併進移動させるだけのスペースを確保するだけで足りる。したがって、送りねじクラッチ機構を採用する機器における省スペース化を促進することができる。 Therefore, according to the present invention, there is no need for a space for moving the first and second support members in the opening and closing directions in a clip-like manner, and the first and second support members can be moved between the first and second positions. It is sufficient to secure enough space for mutual translation. Therefore, it is possible to promote space saving in equipment that employs the feed screw clutch mechanism.

本発明において、
前記第１、第２支持部材は、それぞれ、
表面及び裏面並びにこれらの周縁を接続する周縁面を有する板状部と、
該板状部の裏面の周縁部から該裏面に直交する方向に延び、その延びた先端部において、前記第１又は第２ハーフ部材を保持する複数本の棒状部とを備え、
前記第２支持部材の板状部は、前記第１支持部材の前記棒状部が嵌合する嵌合凹部を前記周縁面に備え、
前記第１、第２支持部材は、相互に前記併進移動の方向に相対移動し得るように案内し合う案内面を有し、
前記案内面は、前記第１、第２支持部材の前記第１、第２位置間での移動に際して相互に摺動し合う前記嵌合凹部、前記第１、第２支持部材の前記棒状部の側面、前記第１ハーフ部材の側面により構成され、
前記第１面は、前記第１支持部材の前記板状部の裏面により構成され、
前記第２面は、前記第２支持部材の前記板状部の表面により構成され、
前記付勢部材は、前記第２支持部材の前記板状部の裏面と前記第１ハーフ部材との間に介在して前記第１、第２支持部材を、前記第１位置に向かう方向に付勢するものであることが好ましい。 In the present invention,
The first and second support members each include:
a plate-shaped portion having a front surface, a back surface, and a peripheral surface connecting these peripheral edges;
a plurality of rod-shaped parts extending from the peripheral edge of the back surface of the plate-shaped part in a direction perpendicular to the back surface, and holding the first or second half member at the extending tip thereof;
The plate-shaped portion of the second support member includes a fitting recess on the peripheral surface into which the rod-shaped portion of the first support member fits,
The first and second support members have guide surfaces that guide each other so that they can move relative to each other in the direction of the translational movement,
The guide surface includes the fitting recess and the rod-shaped portion of the first and second support members that slide against each other when the first and second support members move between the first and second positions. a side surface, comprising a side surface of the first half member;
The first surface is constituted by a back surface of the plate-shaped portion of the first support member,
The second surface is constituted by a surface of the plate-shaped portion of the second support member,
The biasing member is interposed between the back surface of the plate-shaped portion of the second support member and the first half member, and biases the first and second support members in the direction toward the first position. It is preferable that the

これによれば、第１、第２支持部材の第１、第２位置間での併進移動を適切に実現しつつ、送りねじクラッチ機構をコンパクトに構成することができる。 According to this, the feed screw clutch mechanism can be configured compactly while appropriately realizing translational movement of the first and second support members between the first and second positions.

本発明において、
前記第２支持部材の前記板状部の板面は、矩形状の形状を有し、
前記第２支持部材は、前記棒状部として、
断面が矩形状で、前記板状部側の端面の一辺が前記板面の一辺の中央部を構成する１本の第１棒状部と、
断面が矩形状で、前記板状部側の端面の一辺が前記板面の前記一辺と反対側の辺の両端部を構成している２本の第２棒状部とを備え、
前記第２支持部材の前記板状部は、前記嵌合凹部として、
前記併進移動の方向に垂直な断面が直角三角形状で、該板状部における前記第１棒状部の両側の角部にそれぞれ設けられた２つの三角状凹部であって、各三角状凹部の一方の内壁が該第１棒状部の該板状部側端部の側面の一部を構成する該三角状凹部と、
前記併進移動の方向に垂直な断面が矩形状で、前記２本の第２棒状部における該板状部側の端部の対向する各側面により側壁が形成された１つの矩形状凹部とを備え、
前記第１、第２棒状部は、それぞれ、
前記第２支持部材の前記板状部と反対側の端部に設けられ、前記第２ハーフ部材に対向する内側面と、
前記内側面から突出した凸部とを備え、
前記第２ハーフ部材は、
前記第１棒状部の前記内側面及び前記２本の第２棒状部の前記内側面にそれぞれ対向する第１、第２側面と、
前記第１、第２側面にそれぞれ設けられ、前記第１、第２棒状部の前記凸部がそれぞれ嵌合可能な２つの凹条を備え、
各凹条及び対応する前記凸部は、該凹条に対して該凹条に沿った方向に該凸部をスライドさせることにより相互に嵌合して固定されるように構成され、
前記第１支持部材は、前記第２支持部材と同じ構成を有するのが好ましい。 In the present invention,
The plate surface of the plate-shaped portion of the second support member has a rectangular shape,
The second support member, as the rod-shaped portion,
one first rod-shaped part having a rectangular cross section, and one side of the end face on the plate-shaped part side forming a central part of one side of the plate surface;
two second rod-shaped parts each having a rectangular cross-section, and one side of the end face on the plate-shaped part side forming both ends of the side opposite to the one side of the plate surface;
The plate-shaped portion of the second support member serves as the fitting recess,
two triangular recesses each having a right triangular cross section perpendicular to the direction of the translational movement and provided at each corner on both sides of the first bar-like part in the plate-like part, one of the triangular recesses; the triangular recess, the inner wall of which constitutes a part of the side surface of the plate-like end of the first rod-like part;
one rectangular recess having a rectangular cross section perpendicular to the direction of the translational movement, and having side walls formed by opposing side surfaces of the end portions of the two second rod portions on the plate portion side; ,
The first and second rod-shaped portions each include:
an inner surface provided at an end portion of the second support member opposite to the plate-shaped portion and facing the second half member;
and a convex portion protruding from the inner surface,
The second half member is
first and second side surfaces respectively opposing the inner surface of the first rod-shaped portion and the inner surfaces of the two second rod-shaped portions;
two grooves provided on each of the first and second side surfaces, into which the convex portions of the first and second rod-shaped portions can fit, respectively;
Each groove and the corresponding convex portion are configured to be fitted and fixed to each other by sliding the convex portion relative to the groove in a direction along the groove,
Preferably, the first support member has the same configuration as the second support member.

これによれば、第１支持部材の第１、第２棒状部を、それぞれ第２支持部材の矩形状凹部及び三角状凹部にスライドさせて嵌合し、第１、第２棒状部の凸部に第１、第２ハーフ部材の凹条をスライドさせて嵌合させるだけで、第１、第２支持部材と、第１、第２ハーフ部材とを結合させることができる。 According to this, the first and second rod-shaped parts of the first support member are slid and fitted into the rectangular recess and the triangular recess of the second support member, respectively, and the protrusions of the first and second rod-shaped parts are fitted. The first and second support members and the first and second half members can be combined by simply sliding and fitting the grooves of the first and second half members.

本発明の一実施形態に係る送りねじクラッチ機構を示す斜視図である。FIG. 1 is a perspective view showing a feed screw clutch mechanism according to an embodiment of the present invention. 図１の送りねじクラッチ機構の内部を示す透明図である。2 is a transparent view showing the inside of the feed screw clutch mechanism of FIG. 1. FIG. 図１の送りねじクラッチ機構の第１、第２支持部材の斜視図である。FIG. 2 is a perspective view of first and second support members of the feed screw clutch mechanism of FIG. 1; 図４Ａは、図１の送りねじクラッチ機構の第１、第２ハーフ部材の斜視図である。4A is a perspective view of the first and second half members of the lead screw clutch mechanism of FIG. 1. FIG. 図４Ｂは、該１、第２ハーフ部材を別の方向から見た斜視図である。FIG. 4B is a perspective view of the first and second half members viewed from another direction. 図１の送りねじクラッチ機構における第１、第２支持部材及び第１、第２ハーフ部材を組み合わせた様子を示す斜視図である。FIG. 2 is a perspective view showing a state in which the first and second support members and the first and second half members in the feed screw clutch mechanism of FIG. 1 are combined. 送りねじクラッチ機構の第１、第２支持部材が第１位置に位置しているときの様子を示す図である。It is a figure which shows the situation when the 1st and 2nd support member of a feed screw clutch mechanism is located in a 1st position. 送りねじクラッチ機構の第１、第２支持部材が第２位置に位置しているときの様子を示す図である。It is a figure which shows the situation when the 1st and 2nd support member of a feed screw clutch mechanism is located in a 2nd position.

以下、図面を用いて本発明の実施形態を説明する。図１は、本発明の一実施形態に係る送りねじクラッチ機構を示す。図１に示すように、この送りねじクラッチ機構１は、送りねじ２からの送り対象物に対する動力の伝達を断続するものである。送り対象物としては、本実施形態では、点滴静脈注射を行う際に使用されるシリンジポンプのプランジャを押すドライブシャフト３が該当する。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a feed screw clutch mechanism according to one embodiment of the present invention. As shown in FIG. 1, this feed screw clutch mechanism 1 is for intermittent transmission of power from a feed screw 2 to an object to be fed. In this embodiment, the object to be sent is the drive shaft 3 that pushes the plunger of a syringe pump used when performing intravenous drip injection.

送りねじクラッチ機構１は、その主要部を収容するケース部としてのクラッチケース４を備える。クラッチケース４は、２本のスライドシャフト５によって送り方向に案内されている。 The feed screw clutch mechanism 1 includes a clutch case 4 as a case portion that accommodates the main parts thereof. The clutch case 4 is guided in the feeding direction by two slide shafts 5.

図２は、送りねじクラッチ機構１の内部を示す。図２に示すように、送りねじクラッチ機構１は、それぞれハーフナットを構成する第１、第２ハーフ部材６、７と、第１、第２ハーフ部材６、７をそれぞれの螺合面が対峙する姿勢で支持するとともに、後述する第１位置Ｐ１（図６参照）と、第２位置Ｐ２（図７参照）との間で併進移動し得るように互いに案内し合う第１、第２支持部材８、９とを備える。 FIG. 2 shows the inside of the feed screw clutch mechanism 1. As shown in FIG. 2, the feed screw clutch mechanism 1 has first and second half members 6 and 7 that constitute a half nut, and the first and second half members 6 and 7 have their respective screwing surfaces facing each other. first and second support members that support each other in a posture such that the support members can move in translation between a first position P1 (see FIG. 6) and a second position P2 (see FIG. 7), which will be described later. 8 and 9.

クラッチケース４は、第１、第２支持部材８、９を、第１、第２位置Ｐ１、Ｐ２の間で併進移動し得るように収容する。クラッチケース４は、ドライブシャフト３に固定される。また、送りねじクラッチ機構１は、第１、第２支持部材８、９を第１、第２位置Ｐ１、Ｐ２の間で併進移動させることにより第１、第２支持部材８、９の位置を第１、第２位置Ｐ１、Ｐ２の間で切り替える断続切替手段を備える。 Clutch case 4 accommodates first and second support members 8 and 9 so as to be able to translate between first and second positions P1 and P2. Clutch case 4 is fixed to drive shaft 3. Further, the feed screw clutch mechanism 1 changes the positions of the first and second support members 8 and 9 by moving the first and second support members 8 and 9 in translation between the first and second positions P1 and P2. An intermittent switching means is provided for switching between the first and second positions P1 and P2.

第１位置Ｐ１は、第１、第２ハーフ部材６、７が相互に近接又は当接して送りねじ２と螺合する送り部を形成する位置である。第２位置Ｐ２は、第１、第２ハーフ部材６、７が相互に離間して送りねじ２との螺合が解除される位置である。図２では、第１、第２支持部材８、９が第１位置Ｐ１に位置しているときの状態が示されている。 The first position P1 is a position where the first and second half members 6 and 7 are close to each other or in contact with each other to form a feed portion that is threadedly engaged with the feed screw 2. The second position P2 is a position where the first and second half members 6, 7 are separated from each other and the screw engagement with the feed screw 2 is released. FIG. 2 shows a state in which the first and second support members 8 and 9 are located at the first position P1.

断続切替手段は、第１、第２支持部材８、９を、第１位置Ｐ１に向かう方向に付勢する付勢部材１０と、第１、第２支持部材８、９にそれぞれ設けられて対向する第１、第２面１１、１２と、第１、第２面１１、１２の間に位置するカム部材１３とを備える。付勢部材１０として、本実施形態では、圧縮コイルばねが用いられる（図６参照）。
カム部材１３は、第１、第２面１１、１２の双方に接して回転することにより第１、第２面１１、１２間の間隔を増減させるカム面を有する。そして、該間隔の増減により、カム部材１３は、第１、第２支持部材８、９を第１、第２位置Ｐ１、Ｐ２の間で移動させる。カム部材１３の回転は、先端部がカム部材１３に挿入して固定され、ドライブシャフト３内を通るクラッチシャフト１４を回転させることにより行われる。 The intermittent switching means includes a biasing member 10 that biases the first and second support members 8 and 9 in the direction toward the first position P1, and a biasing member 10 provided on the first and second support members 8 and 9 and facing each other. and a cam member 13 located between the first and second surfaces 11 and 12. In this embodiment, a compression coil spring is used as the biasing member 10 (see FIG. 6).
The cam member 13 has a cam surface that increases or decreases the distance between the first and second surfaces 11 and 12 by rotating in contact with both the first and second surfaces 11 and 12. Then, by increasing or decreasing the interval, the cam member 13 moves the first and second support members 8 and 9 between the first and second positions P1 and P2. The cam member 13 is rotated by rotating a clutch shaft 14 whose tip end is inserted into and fixed to the cam member 13 and passes through the drive shaft 3.

図３は、第１、第２支持部材８、９を示す。図３に示すように、第１、第２支持部材８、９は、表面８ａ及び裏面８ｂ並びにこれらの周縁を接続する周縁面１５を有する板状部１６と、板状部１６の裏面８ｂの周縁部から該裏面８ｂに直交する方向に延びた複数本（本実施形態では３本）の棒状部１７とを備える。これらの棒状部１７は、先端部において第１ハーフ部材６又は第２ハーフ部材７を保持する。板状部１６は、板面が矩形状の形状を有する。本実施形態では、第１、第２支持部材８、９は、同じ構成及び形状を有する。 FIG. 3 shows the first and second support members 8,9. As shown in FIG. 3, the first and second support members 8 and 9 have a plate-like portion 16 having a front surface 8a, a back surface 8b, and a peripheral edge surface 15 connecting these peripheral edges, and a back surface 8b of the plate-like portion 16. It includes a plurality of (three in this embodiment) rod-shaped portions 17 extending from the peripheral edge in a direction orthogonal to the back surface 8b. These rod-shaped portions 17 hold the first half member 6 or the second half member 7 at their tips. The plate portion 16 has a rectangular plate surface. In this embodiment, the first and second support members 8 and 9 have the same configuration and shape.

第２支持部材９の板状部１６は、第１支持部材８の棒状部１７が嵌合する嵌合凹部２５を周縁面に備える（図５参照）。第１、第２支持部材８、９は、相互に前記併進移動の方向に相対移動し得るように案内し合う案内面２４を有する。 The plate-shaped portion 16 of the second support member 9 has a fitting recess 25 on its peripheral surface into which the rod-shaped portion 17 of the first support member 8 fits (see FIG. 5). The first and second support members 8 and 9 have guide surfaces 24 that guide each other so that they can move relative to each other in the direction of translational movement.

案内面２４は、第１、第２支持部材８、９の第１、第２位置Ｐ１、Ｐ２間での移動に際して相互に摺動し合う嵌合凹部２５、第１、第２支持部材８、９の棒状部１７の側面、及び第１ハーフ部材６の側面により構成される。 The guide surface 24 includes a fitting recess 25, the first and second support members 8, which slide against each other when the first and second support members 8 and 9 move between the first and second positions P1 and P2. 9 and the side surface of the first half member 6.

カム部材１３のカム面と接触する第１面１１は、第１支持部材８の板状部１６の裏面８ｂにより構成され、第２面１２は、第２支持部材９の板状部１６の表面８ａにより構成される。付勢部材１０は、第２支持部材９の板状部１６の裏面と第１ハーフ部材６との間に介在して第１、第２支持部材８、９を、第１位置Ｐ1に向かう方向に付勢する。 The first surface 11 that contacts the cam surface of the cam member 13 is constituted by the back surface 8b of the plate-like portion 16 of the first support member 8, and the second surface 12 is constituted by the surface of the plate-like portion 16 of the second support member 9. 8a. The biasing member 10 is interposed between the back surface of the plate-shaped portion 16 of the second support member 9 and the first half member 6, and urges the first and second support members 8, 9 in a direction toward the first position P1. to energize.

第１、第２支持部材８、９は、棒状部１７として、断面が矩形状で、板状部１６側の端面の一辺が該板面の一辺の中央部を構成する１本の第１棒状部１７ａと、断面が矩形状で、板状部１６側の端面の一辺が該板面の前記一辺と反対側の辺の両端部を構成している２本の第２棒状部１７ｂとを備える。 The first and second support members 8 and 9 each have a rectangular cross-section as a rod-like portion 17, and one first rod-like shape with one side of the end surface on the plate-like portion 16 side forming the center of one side of the plate surface. a section 17a, and two second rod-shaped sections 17b each having a rectangular cross-section, and one side of the end surface on the plate-shaped section 16 side forming both ends of the side opposite to the one side of the plate surface. .

板状部１６は、嵌合凹部２５として、前記併進移動の方向に垂直な断面が直角三角形状で、板状部１６における第１棒状部１７ａの両側の角部にそれぞれ設けられた２つの三角状凹部２５ａを備える。三角状凹部２５ａは、各三角状凹部２５ａの一方の内壁が第１棒状部１７ａの板状部１６側端部の側面の一部を構成する。 The plate-like part 16 has a right-angled triangular cross section perpendicular to the direction of translational movement as the fitting recess 25, and has two triangular parts provided at the corners on both sides of the first rod-like part 17a in the plate-like part 16. It has a shaped recess 25a. In the triangular recesses 25a, one inner wall of each triangular recess 25a constitutes a part of the side surface of the end of the first rod-shaped part 17a on the plate-shaped part 16 side.

また、板状部１６は、嵌合凹部２５として、前記併進移動の方向に垂直な断面が矩形状で、２本の第２棒状部１７ｂにおける板状部１６側の端部の対向する各側面により側壁が形成された１つの矩形状凹部２５ｂを備える。 Further, the plate-like portion 16 has a rectangular cross section perpendicular to the direction of the translational movement as the fitting recess 25, and each side face of the end of the two second rod-like portions 17b on the plate-like portion 16 side faces each other. One rectangular recess 25b is provided with a side wall formed by.

第１、第２支持部材８の第１、第２棒状部１７ａ、１７ｂは、それぞれ、第１、第２支持部材８の板状部１６と反対側の端部に設けられ、第１、第２ハーフ部材７に対向する内側面と、内側面から突出した凸部１８とを備える。 The first and second rod-shaped parts 17a and 17b of the first and second support members 8 are respectively provided at the ends opposite to the plate-shaped part 16 of the first and second support members 8. It has an inner surface facing the two-half member 7, and a convex portion 18 protruding from the inner surface.

図４Ａ及び図４Ｂは、第１、第２ハーフ部材６、７を異なる方向から見た様子を示す。図４Ａ及び図４Ｂに示すように、第１、第２ハーフ部材６、７は、第１棒状部１７ａの内側面及び２本の第２棒状部１７ｂの内側面にそれぞれ対向する第１、第２側面２６、２７と、第１、第２側面２６、２７にそれぞれ設けられ、第１、第２棒状部１７ａ、１７ｂの凸部１８がそれぞれ嵌合可能な２つの凹条２１を備える。 4A and 4B show the first and second half members 6, 7 viewed from different directions. As shown in FIGS. 4A and 4B, the first and second half members 6 and 7 have first and second half members facing the inner surface of the first rod-shaped portion 17a and the inner surfaces of the two second rod-shaped portions 17b, respectively. Two grooves 21 are provided on the two side surfaces 26 and 27 and on the first and second side surfaces 26 and 27, respectively, and into which the convex portions 18 of the first and second rod-shaped portions 17a and 17b can fit, respectively.

各凹条２１及び対応する凸部１８は、該凹条２１に対して該凹条２１に沿った方向に該凸部１８をスライドさせることにより相互に嵌合して固定されるように構成される。 Each grooved line 21 and the corresponding convex part 18 are configured to be fitted and fixed to each other by sliding the convex part 18 with respect to the grooved line 21 in a direction along the grooved line 21. Ru.

第１、第２ハーフ部材６、７は、矩形状の螺合面としての表面及びその反対側の裏面と、これらの４辺をそれぞれ接続する４つの側面とを有する直方体状の形状を有する。第１、第２ハーフ部材６、７の表面側には、送りねじ２と螺合する送りナットのねじの半周分を構成する半ねじ１９が形成されており、その周方向両端部は、面取りされた面取り部２０となっている。上記４つの側面のうちの送りねじ２の長さ方向に沿った２つの面が、上述の第１、第２側面２６、２７である。 The first and second half members 6 and 7 have a rectangular parallelepiped shape having a front surface serving as a rectangular screwing surface, a back surface opposite to the front surface, and four side surfaces connecting these four sides, respectively. A half-screw 19 is formed on the surface side of the first and second half members 6 and 7, and the half-thread 19 constitutes half the circumference of the thread of the feed nut that is screwed into the feed screw 2, and both ends in the circumferential direction are chamfered. It has a chamfered portion 20. Of the four side surfaces, two surfaces along the length of the feed screw 2 are the first and second side surfaces 26 and 27 described above.

図４Ｂは、第１、第２ハーフ部材６、７を図４Ａとは別の方向から見た様子を示す。図４Ｂに示すように、第１、第２ハーフ部材６、７の裏面には、円状凹部２２が設けられる。第１ハーフ部材６の円状凹部２２は、付勢部材１０を受ける機能を有する。 FIG. 4B shows the first and second half members 6, 7 viewed from a different direction from FIG. 4A. As shown in FIG. 4B, a circular recess 22 is provided on the back surfaces of the first and second half members 6, 7. The circular recess 22 of the first half member 6 has the function of receiving the biasing member 10.

図５は、第１、第２支持部材８、９及び第１、第２ハーフ部材６、７を組み立てたときの様子を示す。この組立ては、例えば、次のようにして行われる。すなわち、まず、図５のように、第２支持部材９の嵌合凹部２５に第１支持部材８の棒状部１７をスライドさせながら第２支持部材９に第１支持部材８を嵌合させる。 FIG. 5 shows how the first and second support members 8 and 9 and the first and second half members 6 and 7 are assembled. This assembly is performed, for example, as follows. That is, first, as shown in FIG. 5, the first support member 8 is fitted into the second support member 9 while sliding the rod-shaped portion 17 of the first support member 8 into the fitting recess 25 of the second support member 9.

次に、第１、第２支持部材９の棒状部１７の凸部１８に、第１、第２ハーフ部材６、７の凹条２１を嵌合させる。これにより、第１、第２ハーフ部材６、７が、それぞれの螺合面が対峙する姿勢で第１、第２支持部材８、９により支持されて組み立てられた状態となる。 Next, the grooves 21 of the first and second half members 6 and 7 are fitted into the convex portions 18 of the rod-shaped portions 17 of the first and second support members 9. As a result, the first and second half members 6 and 7 are assembled and supported by the first and second support members 8 and 9 with their respective screwing surfaces facing each other.

組み立てられた第１、第２支持部材８、９及び第１、第２ハーフ部材６、７をドライブシャフト３と送りねじ２に組み付ける操作は、例えば次のようにして行われる。すなわち、まず、第１、第２支持部材８、９の板状部１６の間にカム部材１３を配置し、第２支持部材９の板状部１６と第１ハーフ部材６との間に付勢部材１０を配置する。これにより、付勢部材１０が第１、第２支持部材８、９を、第１位置Ｐ１に向かう方向に付勢するので、第１、第２ハーフ部材６、７が相互に接して送りねじ２と螺合する送りナットを形成している状態となり、送りねじクラッチ機構１の主要部が構成される。 The operation of assembling the assembled first and second support members 8 and 9 and first and second half members 6 and 7 to the drive shaft 3 and the feed screw 2 is performed, for example, as follows. That is, first, the cam member 13 is arranged between the plate-like parts 16 of the first and second support members 8 and 9, and the cam member 13 is placed between the plate-like part 16 of the second support member 9 and the first half member 6. The force member 10 is arranged. As a result, the biasing member 10 biases the first and second support members 8 and 9 in the direction toward the first position P1, so that the first and second half members 6 and 7 are in contact with each other and the feed screw 2, forming a feed nut that is screwed together with the feed screw clutch mechanism 1, and constitutes the main part of the feed screw clutch mechanism 1.

次に、この主要部を、クラッチケース４に収納する。そして、クラッチケース４をスライドシャフト５により案内させながら、送りねじ２を、上記の形成された送りナットに螺合させ、回転させる。これにより、クラッチケース４がドライブシャフト３の端部に位置付けられ、ドライブシャフト３の内部に通されたクラッチシャフト１４がカム部材１３に連結される。これにより、送りねじクラッチ機構１の組付けが完了する。 Next, this main part is stored in the clutch case 4. Then, while the clutch case 4 is guided by the slide shaft 5, the feed screw 2 is screwed into the formed feed nut and rotated. As a result, the clutch case 4 is positioned at the end of the drive shaft 3, and the clutch shaft 14 passed through the drive shaft 3 is connected to the cam member 13. This completes the assembly of the feed screw clutch mechanism 1.

図６及び図７は、送りねじクラッチ機構１の動作を示す。図６に示すように、カム部材１３が、クラッチシャフト１４の回転角度に応じて、第１支持部材８の第１面１１と、第２支持部材９の第２面１２との間の距離が最小となる回転位置に位置付けられているとき、第１、第２支持部材８、９は、付勢部材１０の付勢力により、第１位置Ｐ１に位置する。 6 and 7 show the operation of the feed screw clutch mechanism 1. As shown in FIG. 6, the cam member 13 adjusts the distance between the first surface 11 of the first support member 8 and the second surface 12 of the second support member 9 according to the rotation angle of the clutch shaft 14. When positioned at the minimum rotation position, the first and second support members 8 and 9 are positioned at the first position P1 due to the biasing force of the biasing member 10.

これにより、送りねじクラッチ機構１は、第１、第２ハーフ部材６、７が相互に接し、送りねじ２と螺合する送りナットを形成した接続状態となる。この状態で、送りねじ２を回転させて、回転量を制御することにより、ドライブシャフト３を任意の位置まで駆動することができる。 As a result, the feed screw clutch mechanism 1 enters a connected state in which the first and second half members 6 and 7 are in contact with each other to form a feed nut that is threadedly engaged with the feed screw 2. In this state, by rotating the feed screw 2 and controlling the amount of rotation, the drive shaft 3 can be driven to an arbitrary position.

一方、図７に示すように、クラッチシャフト１４を回転させて、第１支持部材８の第１面１１と、第２支持部材９の第２面１２との間の距離が最大となる回転位置に位置付けると、第１、第２支持部材８、９は、第２位置Ｐ２に位置する。これにより、送りねじクラッチ機構１は、第１、第２ハーフ部材６、７が相互に離間し、送りねじ２との螺合が解除された切断状態となる。 On the other hand, as shown in FIG. 7, the clutch shaft 14 is rotated to a rotational position where the distance between the first surface 11 of the first support member 8 and the second surface 12 of the second support member 9 is maximum. , the first and second support members 8 and 9 are located at the second position P2. As a result, the feed screw clutch mechanism 1 enters a disconnected state in which the first and second half members 6 and 7 are separated from each other and the screw engagement with the feed screw 2 is released.

これにより、シリンジポンプのプランジャを押すドライブシャフト３が自由にスライドシャフト５に沿った送り方向に移動可能となる。これにより、例えば、ドライブシャフト３をプランジャに対して容易に密接させて接続することが可能となる。 Thereby, the drive shaft 3 that pushes the plunger of the syringe pump can freely move in the feeding direction along the slide shaft 5. This makes it possible, for example, to easily connect the drive shaft 3 to the plunger in close contact with the plunger.

以上のように、本実施形態によれば、第１、第２支持部材８、９を、第１、第２ハーフ部材６、７の螺合面が対峙する姿勢で併進移動させることにより、第１、第２支持部材８、９の位置が第１、第２位置Ｐ１、Ｐ２間で切り替えられる。この切替えにより、送りねじ２からのドライブシャフト３に対する動力の伝達が断続される。このため、第１、第２支持部材８、９は、動力伝達の断続に際してクリップ状に開閉動作することはない。 As described above, according to the present embodiment, by translating the first and second support members 8 and 9 in a posture in which the threaded surfaces of the first and second half members 6 and 7 face each other, 1. The positions of the second support members 8 and 9 are switched between the first and second positions P1 and P2. By this switching, the transmission of power from the feed screw 2 to the drive shaft 3 is interrupted. Therefore, the first and second support members 8 and 9 do not open or close like a clip when power transmission is interrupted or interrupted.

これにより、第１、第２支持部材８、９をクリップ状に開閉方向に動作させるためのスペースが不要となり、第１、第２支持部材８、９を、第１、第２位置Ｐ１、Ｐ２との間で相互に併進移動させるだけのスペースを確保するだけで足りる。したがって、送りねじクラッチ機構１を採用する機器における省スペース化を促進することができる。 This eliminates the need for space for moving the first and second support members 8 and 9 in the opening and closing directions in a clip-like manner, and allows the first and second support members 8 and 9 to be moved to the first and second positions P1 and P2. It is sufficient to secure enough space for mutual translation between the two. Therefore, it is possible to promote space saving in equipment that employs the feed screw clutch mechanism 1.

以上、本発明の実施形態を説明したが、本発明はこれに限定されない。例えば、本発明の送りねじクラッチ機構は、ボールねじにより送り対象物を送る際に、送りねじと、ハーフ部材で構成される送りナットとの間の断続を切り替えることが必要とされる種々の場合に適用することができる。 Although the embodiments of the present invention have been described above, the present invention is not limited thereto. For example, the feed screw clutch mechanism of the present invention can be used in various cases where it is necessary to switch on and off between the feed screw and the feed nut composed of a half member when feeding an object using a ball screw. It can be applied to

また、切替手段の付勢部材は、第１、第２支持部材を第２位置に向かう方向に付勢するものであってもよい。この場合、カム部材としては、第１、第２支持部材を、第１支持部材又は第１ハーフ部材に設けられた第１面と、第２支持部材又は第２ハーフ部材に設けられた第２面との間の間隔を増大させることにより第１位置Ｐ１に移動させ、減少させることにより第２位置Ｐ２に移動させるものが採用される。 Moreover, the biasing member of the switching means may bias the first and second support members in the direction toward the second position. In this case, the cam member includes the first and second support members, a first surface provided on the first support member or the first half member, and a second surface provided on the second support member or the second half member. A method is adopted in which the distance between the surface and the surface is increased to move it to the first position P1, and by decreasing it, it is moved to the second position P2.

また、第１、第２ハーフ部材６、７のうちの一方のみがハーフナットを構成するものであってもよい。この場合、他方は、送りねじ２を該一方のハーフナットに螺合するように押し付けるものであれば足りる。また、第１面、第２面は、第１ハーフ部材や第２ハーフ部材に設けてもよい。 Further, only one of the first and second half members 6 and 7 may constitute a half nut. In this case, it is sufficient that the other half nut is one that presses the feed screw 2 so as to be screwed into the one half nut. Further, the first surface and the second surface may be provided on the first half member or the second half member.

１…送りねじクラッチ機構、２…送りねじ、３…ドライブシャフト、４…クラッチケース、５…スライドシャフト、６…第１ハーフ部材、７…第２ハーフ部材、８…第１支持部材、８ａ…表面、８ｂ…裏面、９…第２支持部材、１０…付勢部材、１１…第１面、１２…第２面、１３…カム部材、１４…クラッチシャフト、１５…周縁面、１６…板状部、１７…棒状部、１７ａ…第１棒状部、１７ｂ…第２棒状部、１８…凸部、１９…半ねじ、２０…面取り部、２１…凹条、２２…円状凹部、２４…案内面、２５…嵌合凹部、２５ａ…三角状凹部、２５ｂ…矩形状凹部、２６…第１側面、２７…第２側面、Ｐ１…第１位置、Ｐ２…第２位置。 DESCRIPTION OF SYMBOLS 1... Feed screw clutch mechanism, 2... Feed screw, 3... Drive shaft, 4... Clutch case, 5... Slide shaft, 6... First half member, 7... Second half member, 8... First support member, 8a... Front surface, 8b...Back surface, 9...Second support member, 10...Biasing member, 11...First surface, 12...Second surface, 13...Cam member, 14...Clutch shaft, 15...Peripheral surface, 16...Plate shape Part, 17... Bar-shaped part, 17a... First bar-shaped part, 17b... Second bar-shaped part, 18... Convex part, 19... Half thread, 20... Chamfered part, 21... Recessed line, 22... Circular recessed part, 24... Guide Surface, 25... Fitting recess, 25a... Triangular recess, 25b... Rectangular recess, 26... First side surface, 27... Second side surface, P1... First position, P2... Second position.

Claims (3)

送りねじにより送り方向に送られる送り対象物と該送りねじとの間の動力の伝達を断続する送りねじクラッチ機構であって、
少なくとも一方がハーフナットを構成する第１、第２ハーフ部材と、
前記第１、第２ハーフ部材をそれぞれ支持し、該第１、第２ハーフ部材が相互に近接して前記送りねじと螺合する送り部を形成する第１位置と、該第１、第２ハーフ部材が相互に離間して該送りねじとの螺合が解除される第２位置との間で併進移動し得るように互いに案内し合う第１、第２支持部材と、
前記第１、第２支持部材を、前記第１、第２位置の間で併進移動し得るように収容するとともに前記送り対象物に固定されたケース部と、
前記第１、第２支持部材を前記第１、第２位置の間で併進移動させる切替手段とを備え、
前記切替手段は、
前記第１、第２支持部材を、前記第１位置又は前記第２位置に向かう方向に付勢する付勢部材と、
前記第１支持部材又は第１ハーフ部材に設けられた第１面と前記第２支持部材又は第２ハーフ部材に設けられて該第１面と対向する第２面との双方に接して回転することにより該第１、第２面間の間隔を増減させるカム面を有し、該間隔の増減により前記第１、第２支持部材を前記第１、第２位置の間で移動させるカム部材とを備えることを特徴とする送りねじクラッチ機構。 A feed screw clutch mechanism for intermittent transmission of power between an object to be fed in a feed direction by a feed screw and the feed screw,
first and second half members, at least one of which constitutes a half nut;
a first position that supports the first and second half members, and where the first and second half members are close to each other to form a feed portion that is threadedly engaged with the feed screw; first and second support members that guide each other so that the half members can move in translation between a second position where the half members are separated from each other and the threaded engagement with the feed screw is released;
a case portion that accommodates the first and second support members so as to be movable in translation between the first and second positions and is fixed to the object to be fed;
switching means for translating the first and second support members between the first and second positions,
The switching means is
a biasing member that biases the first and second support members in a direction toward the first position or the second position;
Rotates in contact with both a first surface provided on the first support member or first half member and a second surface provided on the second support member or second half member and facing the first surface. a cam member that has a cam surface that increases or decreases the distance between the first and second surfaces, and that moves the first and second support members between the first and second positions by increasing or decreasing the distance; A feed screw clutch mechanism characterized by comprising: 前記第１、第２支持部材は、それぞれ、
表面及び裏面並びにこれらの周縁を接続する周縁面を有する板状部と、
該板状部の裏面の周縁部から該裏面に直交する方向に延び、その延びた先端部において、前記第１又は第２ハーフ部材を保持する複数本の棒状部とを備え、
前記第２支持部材の板状部は、前記第１支持部材の前記棒状部が嵌合する嵌合凹部を前記周縁面に備え、
前記第１、第２支持部材は、相互に前記併進移動の方向に相対移動し得るように案内し合う案内面を有し、
前記案内面は、前記第１、第２支持部材の前記第１、第２位置間での移動に際して相互に摺動し合う前記嵌合凹部、前記第１、第２支持部材の前記棒状部の側面、前記第１ハーフ部材の側面により構成され、
前記第１面は、前記第１支持部材の前記板状部の裏面により構成され、
前記第２面は、前記第２支持部材の前記板状部の表面により構成され、
前記付勢部材は、前記第２支持部材の前記板状部の裏面と前記第１ハーフ部材との間に介在して前記第１、第２支持部材を、前記第１位置に向かう方向に付勢することを特徴とする請求項１に記載の送りねじクラッチ機構。 The first and second support members each include:
a plate-shaped portion having a front surface, a back surface, and a peripheral surface connecting these peripheral edges;
a plurality of rod-shaped parts extending from the peripheral edge of the back surface of the plate-shaped part in a direction perpendicular to the back surface, and holding the first or second half member at the extending tip thereof;
The plate-shaped portion of the second support member includes a fitting recess on the peripheral surface into which the rod-shaped portion of the first support member fits,
The first and second support members have guide surfaces that guide each other so that they can move relative to each other in the direction of the translational movement,
The guide surface includes the fitting recess and the rod-shaped portion of the first and second support members that slide against each other when the first and second support members move between the first and second positions. a side surface, comprising a side surface of the first half member;
The first surface is constituted by a back surface of the plate-shaped portion of the first support member,
The second surface is constituted by a surface of the plate-shaped portion of the second support member,
The biasing member is interposed between the back surface of the plate-shaped portion of the second support member and the first half member, and biases the first and second support members in the direction toward the first position. 2. The feed screw clutch mechanism according to claim 1, wherein the feed screw clutch mechanism 前記第２支持部材の前記板状部の板面は、矩形状の形状を有し、
前記第２支持部材は、前記棒状部として、
断面が矩形状で、前記板状部側の端面の一辺が前記板面の一辺の中央部を構成する１本の第１棒状部と、
断面が矩形状で、前記板状部側の端面の一辺が前記板面の前記一辺と反対側の辺の両端部を構成している２本の第２棒状部とを備え、
前記第２支持部材の前記板状部は、前記嵌合凹部として、
前記併進移動の方向に垂直な断面が直角三角形状で、該板状部における前記第１棒状部の両側の角部にそれぞれ設けられた２つの三角状凹部であって、各三角状凹部の一方の内壁が該第１棒状部の該板状部側端部の側面の一部を構成する該三角状凹部と、
前記併進移動の方向に垂直な断面が矩形状で、前記２本の第２棒状部における該板状部側の端部の対向する各側面により側壁が形成された１つの矩形状凹部とを備え、
前記第１、第２棒状部は、それぞれ、
前記第２支持部材の前記板状部と反対側の端部に設けられ、前記第２ハーフ部材に対向する内側面と、
前記内側面から突出した凸部とを備え、
前記第２ハーフ部材は、
前記第１棒状部の前記内側面及び前記２本の第２棒状部の前記内側面にそれぞれ対向する第１、第２側面と、
前記第１、第２側面にそれぞれ設けられ、前記第１、第２棒状部の前記凸部がそれぞれ嵌合可能な２つの凹条を備え、
各凹条及び対応する前記凸部は、該凹条に対して該凹条に沿った方向に該凸部をスライドさせることにより相互に嵌合して固定されるように構成され、
前記第１支持部材は、前記第２支持部材と同じ構成を有することを特徴とする請求項２に記載の送りねじクラッチ機構。 The plate surface of the plate-shaped portion of the second support member has a rectangular shape,
The second support member, as the rod-shaped portion,
one first rod-shaped part having a rectangular cross section, and one side of the end face on the plate-shaped part side forming a central part of one side of the plate surface;
two second rod-shaped parts each having a rectangular cross-section and one side of the end face on the side of the plate-shaped part forming both ends of the side opposite to the one side of the plate surface;
The plate-shaped portion of the second support member serves as the fitting recess,
two triangular recesses each having a right triangular cross section perpendicular to the direction of the translational movement and provided at each corner on both sides of the first bar-like part in the plate-like part, one of the triangular recesses; the triangular recess, the inner wall of which constitutes a part of the side surface of the plate-like end of the first rod-like part;
one rectangular concave portion having a rectangular cross section perpendicular to the direction of the translational movement, and having side walls formed by opposing side surfaces of the end portions of the two second rod portions on the plate portion side; ,
The first and second rod-shaped portions each include:
an inner surface provided at an end portion of the second support member opposite to the plate-shaped portion and facing the second half member;
and a convex portion protruding from the inner surface,
The second half member is
first and second side surfaces respectively opposing the inner surface of the first rod-shaped portion and the inner surfaces of the two second rod-shaped portions;
two grooves provided on each of the first and second side surfaces, into which the convex portions of the first and second rod-shaped portions can fit, respectively;
Each groove and the corresponding convex portion are configured to be fitted and fixed to each other by sliding the convex portion relative to the groove in a direction along the groove,
The feed screw clutch mechanism according to claim 2, wherein the first support member has the same configuration as the second support member.
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JP2011140082A (en) 2010-01-06 2011-07-21 Kosoku Electric Co Ltd Bar cutter
JP2016508045A (en) 2012-12-21 2016-03-17 デカ・プロダクツ・リミテッド・パートナーシップ Syringe pump system

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US5106375A (en) 1991-05-23 1992-04-21 Ivac Corporation Dynamic lead screw engagement and indicator
JP2007528260A (en) 2004-03-19 2007-10-11 メドトロニック ミニメド インコーポレイテッド Lead screw driven syringe with integral separating plunger nut and system comprising the syringe
JP2011140082A (en) 2010-01-06 2011-07-21 Kosoku Electric Co Ltd Bar cutter
JP2016508045A (en) 2012-12-21 2016-03-17 デカ・プロダクツ・リミテッド・パートナーシップ Syringe pump system

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