JP2005048883A - Electric actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply change distance between a slider for conveying a workpiece and a rotary driving part in accordance with a shape and size of the workpiece to avoid the contact of the workpiece with the rotary driving part by a simple and inexpensive means. <P>SOLUTION: This electric actuator is composed of a body 12, a rotary driving source 18 arranged on one end part side of the body 12, a timing belt 28a turning peripherally under driving action of the rotary driving source 18, the slider 24 displaced along the direction of axial line of the body 12 by the timing belt 28a, and a spacer 20 connected between a base body 60 provided with the rotary driving source 18 and one end part of the body 12. The spacer 20 is formed by the same pressing member as the base body 60 and is tightened together with the base body 60 through a connection bolt 50 to connect it with the body 12 integrally. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric actuator that moves a slider by transmitting a rotational driving force of a rotary driving unit to the slider via a driving force transmission belt.

  2. Description of the Related Art Conventionally, an electric actuator that drives a timing belt by a rotational driving force of a rotational driving source such as a motor and displaces a slider that conveys a workpiece has been widely used as a means for conveying a workpiece or the like.

  In this type of electric actuator, a motor that functions as a rotational drive source is integrally connected to one end of a long frame, and the motor is provided so as to protrude by a predetermined height on the upper surface side of the frame. A driving pulley is connected to the driving shaft of the motor inside the frame, and a timing belt is suspended between the driving pulley and a driven pulley that is rotatably supported on the other end of the frame. Has been.

  A slider for conveying the workpiece is provided on the upper surface of the frame so as to be displaceable along the axial direction, and the timing belt is connected to the slider. The slider is displaced along the frame via a timing belt under the driving action of the rotary drive source, and the work placed on the upper surface of the slider is conveyed (see, for example, Patent Document 1).

JP 2001-198874 A

  By the way, in the electric actuator according to Patent Document 1, a workpiece having a shape and size that protrudes outward from the upper surface of the slider may be conveyed by the slider. When the workpiece is placed and the slider is displaced to the end of the motor under the displacement action, that is, when the distance between the slider and the motor becomes the smallest, There is a possibility that the motor and the work mounted so as to protrude upward at the end portion come into contact with each other.

  Therefore, as a measure to avoid contact between the workpiece and the motor when the slider reaches the displacement end position, the slider moves from the displacement end position to the motor side according to the shape and size of the workpiece conveyed by the slider. It is conceivable to form the frame by extending its length. That is, by extending the length of the frame, the distance between the slider and the motor at the displacement end position of the slider can be increased to avoid contact.

  However, since it is necessary to change the length of the frame according to the shape and size of the workpiece conveyed by the slider, the type of frame increases according to various workpiece shapes and the manufacturing cost increases. There's a problem.

  Further, as another measure for avoiding the contact between the work placed on the slider and the motor, it is conceivable to mount the motor on the lower surface side of the frame so as to protrude to the lower side of the frame. By doing so, it is possible to avoid contact between the work conveyed along the upper surface of the frame and the motor provided on the lower side of the frame.

  In that case, since the electric actuator is generally installed substantially horizontally along a flat surface or the like, the motor that protrudes downward from the frame is an obstacle to installing the electric actuator. It becomes. Therefore, for example, a storage hole for storing the motor is formed in advance on a plane or the like on which the electric actuator is installed, and the electric actuator can be installed substantially horizontally on the plane by storing the motor in the storage hole. . However, it is necessary to previously form a storage hole on a flat surface or the like according to the shape of the motor and the position where the electric actuator is installed, which is complicated.

  The present invention has been made in consideration of the above-mentioned various problems and the like, and it is possible to easily and inexpensively change the separation distance along the axial direction between the slider that conveys the workpiece and the rotation drive unit. An object is to provide an electric actuator.

In order to achieve the above object, the present invention provides an electric actuator that transmits a rotational driving force of a rotational driving unit to a slider via a driving force transmission belt.
Body,
A slider provided in the body so as to be displaceable along the axial direction, and for conveying a workpiece;
A rotation drive unit provided at one end of the body substantially orthogonal to the axis of the body and projecting toward the slider;
A separation member that is detachably held between the body and the rotation drive unit;
With
A separation distance along an axial direction of the body between the body and the rotation driving unit is changed by the separation member.

  According to the present invention, the spacing member is integrally sandwiched between the rotation drive unit provided at the end of the body and protruding from the slider so that the space between the body and the rotation drive unit is interposed. Can be changed in the direction of increasing the separation distance.

  Therefore, when the slider on which the workpiece is placed is displaced in the direction of the rotation drive unit, a sufficient separation distance between the slider and the rotation drive unit can be secured, so that the workpiece is placed on the upper surface of the slider. Even when projecting further toward the rotation drive unit, the contact between the workpiece and the rotation drive unit can be prevented by the separation member.

  In addition, by providing a separation member between the body and the rotation drive unit, the separation distance between the rotation drive unit and the slider can be changed without changing the length along the axial direction of the body. Therefore, it is not necessary to form the body separately according to the shape and size of the workpiece, and the manufacturing cost of the body can be reduced. In addition, by preparing a plurality of separation members having different lengths along the axial direction in advance and replacing the separation members as necessary, the separation distance between the rotary drive unit and the slider can be changed easily and at low cost. Can do.

  Further, the separation member and the rotation drive unit are inserted into an insertion hole formed along the axial direction, and are integrally connected to the body via a connection bolt that is screwed to the body. The spacing member can be easily and reliably connected between the portion and the body, and the spacing member can be easily replaced.

  Furthermore, the rotational drive unit includes a rotational drive source that is rotationally driven by an electric current, and a base body that is mounted with the rotational drive source and connected to the separation member. The base body and the separation member are formed by extrusion molding. By forming each of the formed extruded members, it is not necessary to separately prepare the spacing member when the spacing member is provided, so that the spacing member can be manufactured at low cost.

  According to the present invention, the following effects can be obtained.

  That is, a slider is integrally provided between the body and the rotation driving unit, and the slider is rotated by changing the direction of increasing the separation distance between the body and the rotation driving unit by the separation member. When displaced to the side, a sufficient separation distance between the slider and the rotary drive unit can be secured, and contact between the work placed on the upper surface of the slider and the rotary drive unit can be prevented.

  In addition, since the separation distance between the rotary drive unit and the slider can be changed without changing the length along the axial direction of the body by providing the separation member, the shape and size of the workpiece can be reduced. Accordingly, it is not necessary to form a body, and the manufacturing cost of the body can be reduced.

  Preferred embodiments of the electric actuator according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates an electric actuator according to an embodiment of the present invention.

  The electric actuator 10 includes a long body 12, end blocks 14 a and 14 b and sub end blocks 16 a and 16 b that are integrally connected to both ends of the body 12, and one end block 14 a and sub end block. A rotation drive unit 17 that is disposed at an end on the 16a side and that is driven to rotate by an electric current, a slider 24 that conveys the work 22 (see FIG. 6), and a gear unit 26a that is fitted into the rotation drive unit 17 are provided. Via a timing belt (driving force transmission belt) 28 (see FIG. 5) for transmitting the driving force to the slider 24, a stopper mechanism 30 for regulating the displacement amount of the slider 24, and a control panel 32 for controlling the electric actuator 10. Consists of

  The body 12 is provided with a main frame 34 disposed along the axial direction, a hollow subframe 36 provided substantially parallel to the main frame 34 and through which the timing belt 28 is inserted, and the body 12. The guide rail 38 is arranged in the substantially central portion along the axial direction and guides the slider 24 along the axial direction. End blocks 14a and 14b are connected to both ends of the main frame 34, and sub-end blocks 16a and 16b are similarly connected to both ends of the subframe 36, respectively.

  The sub-end blocks 16a and 16b are formed in a substantially rectangular shape, and a flange portion 40 protruding from the side portion thereof is integrally connected to the end blocks 14a and 14b via a bolt member 42. Further, the sub-end blocks 16a and 16b are integrally connected to the end surface of the sub-frame 36 via a fixing bolt 44 (see FIG. 2).

  On the other hand, as shown in FIG. 2, a substantially rectangular first through hole 46 is formed in the sub-end block 16a along the axial direction, and a timing belt 28 (see FIG. 5) is formed in the inside. It is inserted. The inner side surface of the first through hole 46 has a substantially central portion along the height direction slightly projecting in a semicircular shape toward the center side of the first through hole 46, and a set at the part. The screw hole 48 is formed along the axial direction. The threaded portion 52 of the connecting bolt 50 is screwed into the screw hole 48 via bolt grooves 68a and 68b described later of the base body 60 and engagement grooves 56a and 56b described later of the spacer (separating member) 20. .

  A gear portion 26b (described later) is rotatably supported by a rotating shaft 83 and a timing belt 28 (see FIG. 5) suspended from the gear portion 26b is inserted into the sub-end block 16b. Has been.

  As shown in FIG. 1, the rotation drive unit 17 includes a rotation drive source 18 made of, for example, a stepping motor, and a base body 60 on which the rotation drive source 18 is mounted on the upper surface side. The rotational drive source 18 is surrounded by a housing 62 at the top. That is, the rotation drive source 18 is connected to the end of the sub-end block 16a through the base body 60. The casing 62 is detachably attached to the base body 60 with a bolt or the like (not shown). Further, a gear portion 26a is integrally fitted to the drive shaft 64 projecting downward from the rotational drive source 18, and is inserted into the base body 60 through a mounting hole 65 (see FIG. 2).

  As shown in FIG. 2, the base body 60 is formed in a substantially rectangular shape in cross section by extrusion molding extruded along the axial direction. A second through hole 66 having a substantially rectangular cross-section penetrating along the axial direction is formed in a substantially central portion of the base body 60, and the timing belt 28 (see FIG. 5) is formed inside the second through hole 66. Is inserted.

  In addition, a set of bolt grooves (insertion holes) 68a and 68b having a substantially semicircular cross section that is recessed by a predetermined depth extend along the axial direction on the inner side surface of the second through hole 66, and The bolt grooves 68a and 68b are formed to face each other. A connecting bolt (not shown) is inserted into the bolt grooves 68a and 68b, and an opening (not shown) opened toward the second through hole 66 is formed.

  On the other hand, on one end surface side of the base body 60, as shown in FIG. 3, a concave portion 70 communicating with the bolt grooves 68a and 68b and having a diameter larger than the bolt grooves 68a and 68b is depressed by a predetermined depth. Is formed. The recess 70 is formed in a substantially circular shape corresponding to the shape of the head 72 of the connecting bolt (see FIG. 2). That is, when the connecting bolt is inserted into the recess 70 and the bolt grooves 68a and 68b, the head 72 of the connecting bolt is suitably stored in the recess 70, so that it protrudes from one end surface of the base body 60. Absent.

  A plate mounting hole 74 that is slightly recessed from the end surface is formed on one end surface side of the base body 60. As shown in FIG. 2, the plate mounting hole 74 is formed in a substantially rectangular shape so as to include the second through-hole 66 and the recess 70, and is a thin plate formed in substantially the same shape as the plate mounting hole 74. By mounting the plate-like plate 76, the second through hole 66 and the recess 70 into which the connecting bolt is inserted are closed (see FIG. 1). At this time, one end surface of the base body 60 and the surface of the plate 76 are substantially flush with each other, and when the concave portion 70 is closed by the plate 76, the plate 76 may protrude from the one end surface of the base body 60. Absent.

  As shown in FIG. 1, the slider 24 is mounted on a side surface of the table 78 for placing the workpiece 22 (see FIG. 6) and the like, and the end of the timing belt 28 is connected to each other. The mounting member 80 has end face plates 82a and 82b for preventing wear of the end face of the table 78 when abutting against stopper bolts 86a and 86b described later of the stopper mechanism 30 respectively. The slider 24 is slidably provided along a guide rail 38 that is disposed substantially parallel to the main frame 34 and the sub frame 36 of the body 12.

  The timing belt 28 is fitted into the drive shaft 64 of the rotation drive source 18 and is a gear portion 26a disposed inside the base body 60 and a gear rotatably supported by the rotation shaft 83 in the sub-end block 16b. It is suspended between the part 26b. Further, a plurality of parallel teeth (not shown) spaced apart by a predetermined distance are formed on the inner peripheral surface of the timing belt 28, and the timing belt 28 circulates when the parallel teeth mesh with the gear portions 26a and 26b.

  The electric actuator 10 is provided with a tension adjusting mechanism (not shown) that adjusts the tension of the timing belt 28. The tension adjusting mechanism is provided, for example, in a portion that connects the base body 60 or the sub-end block 16b and the end portions of the timing belt 28 and has a function of adjusting the tension of the timing belt 28. In particular, the shape and the installation location thereof are not limited.

  The stopper mechanism 30 is screwed into the stoppers 84a and 84b respectively attached to the upper portions of the end blocks 14a and 14b, and the stoppers 84a and 84b, and a stopper bolt 86a that adjusts the relative stop positions of the start point and the end point of the slider 24. 86b.

  The control panel 32 is detachably mounted on the side surface of the housing 62 with a bolt or the like (not shown). Piping (not shown) connected to the control panel 32 is accommodated in a wiring groove 88 that is formed in the side surfaces of the base body 60 and the spacer 20. The wiring groove 88 is formed to be in a straight line when the base body 60 and the spacer 20 are connected.

  On the other hand, the slider 24 on which the workpiece 22 (see FIG. 6) protruding toward the rotary drive source 18 is placed and the rotary drive source 18 are separated from each other at the displacement end position where the slider 24 is displaced to the rotary drive source 18 side. In order to set a large distance, a spacer 20 having a predetermined length is mounted between the base body 60 to which the rotational drive source 18 is mounted and the one sub-end block 16a.

  As shown in FIG. 1, the spacer 20 is formed to have a substantially rectangular cross section obtained by cutting the same extrusion member as the base body 60, and is provided so as to be in contact with the end surface of one sub-end block 16 a. The spacer 20 is formed by cutting the extruded member extruded along the axial direction into a desired length.

  As shown in FIGS. 2 and 4, a third through hole 54 through which the timing belt 28 a is inserted is formed in the substantially central portion of the spacer 20 along the axial direction. The third through hole 54 is formed in a substantially rectangular shape in cross section, and engagement grooves (insertion holes) 56a and 56b that are recessed by a predetermined depth extend along the axial direction on the inner side surface thereof. The engaging grooves 56a and 56b are formed in a substantially semicircular cross section as a pair so as to face the inner surface. The timing belt 28a is formed longer by the length along the axial direction of the spacer 20 than when the spacer 20 is not attached.

  As shown in FIG. 4, the third through hole 54 is formed at a position facing the first through hole 46 and the second through hole 66 when the spacer 20 and the sub-end blocks 16a and 16b are connected. In addition, a pair of engaging grooves 56a and 56b are also formed at positions facing the screw hole 48 and the bolt grooves 68a and 68b, respectively. Similarly to the bolt grooves 68a and 68b, an opening 58 that opens toward the third through hole 54 is formed in the engagement grooves 56a and 56b.

  The connection bolt 50 is inserted into the engagement grooves 56a and 56b via the bolt grooves 68a and 68b of the base body 60, and the screw portion 52 of the connection bolt 50 is connected to the screw hole 48 of the sub-end block 16a. The spacer 20 is sandwiched between the base body 60 and the sub-end block 16a. At this time, the connecting bolt 50 is formed longer by the length along the axial direction of the spacer 20 than when the spacer 20 is not mounted.

  In addition, by forming the spacer 20 and the base body 60 from the same extruded member, it is not necessary to prepare separate members for forming the spacer 20, so that the spacer 20 can be manufactured at low cost. In addition, the said base body 60 and the spacer 20 are not limited to the case where it forms from the said extrusion member, You may make it form from a member different from the said extrusion member.

  The electric actuator 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.

  As shown in FIG. 5, in the electric actuator 100 shown as a reference example, the base body 60 to which the rotational drive source 18 is attached is directly connected to the sub-end block 16 a provided at the end of the body 12. Therefore, when the slider 24 with the work 22 placed on the upper surface is displaced to the displacement end position, the rotational drive source 18 depends on the separation distance between the rotary drive source 18 and the slider 24 and the shape and size of the work 22. May come into contact with

  Therefore, as shown in FIG. 1, in order to increase the separation distance between the work 22 and the rotary drive source 18 at the displacement end position of the slider 24, the base body 60 to which the rotary drive source 18 is attached and one of the base bodies 60 are mounted. A case where the spacer 20 is integrally connected to the sub-end block 16a will be described.

  First, after the rotational drive source 18 is removed upward from the base body 60 (see FIG. 5), the plate 76 is removed from the base body 60, and a connecting bolt (not shown) is screwed to rotate the sub-end block 16a. The base body 60 connected to the end face is removed.

  A spacer 20 having a predetermined length corresponding to the amount of protrusion of the workpiece 22 (see FIG. 6) toward the rotational drive source 18 is disposed between the base body 60 and the sub-end block 16a (FIG. 2). reference).

  Next, as shown in FIG. 2, the engagement grooves 56a and 56b of the spacer 20 are aligned with a pair of screw holes 48 formed in the end face of the sub-end block 16a so as to face each other, and the spacer The end face of 20 is brought into contact with the end face of the sub-end block 16a. At this time, the position of the first through hole 46 of the sub-end block 16a and the position of the third through hole 54 of the spacer 20 coincide with each other.

  Next, the base body 60 is brought into contact with the opposite end surface of the spacer 20 in contact with the sub-end block 16a, and the positions of the engagement grooves 56a, 56b and the bolt grooves 68a, 68b are matched, The positions of the third through hole 54 and the second through hole 66 are matched. At this time, the base body 60 is in a state where the rotational drive source 18 is not mounted on the upper surface thereof.

  Then, the connecting bolt 50 corresponding to the length of the spacer 20 is inserted into the pair of bolt grooves 68a and 68b of the base body 60 through the recess 70, respectively, so that the bolt grooves 68a and 68b are engaged. Since the positions of the grooves 56a and 56b and the screw hole 48 are the same, the connecting bolt 50 is inserted into the screw hole 48 through the bolt grooves 68a and 68b and the engagement grooves 56a and 56b. . By rotating the connecting bolt 50 and screwing the screw portion 52 into the screw hole 48, the spacer 20 is sandwiched between the base body 60 and the sub-end block 16a under the screwing action of the connecting bolt 50. Are connected together in a state.

  Next, the rotational drive source 18 is connected to the upper surface of the base body 60 via a screw member (not shown). At that time, the drive shaft 64 and the gear portion 26 a connected to the drive shaft 64 are inserted into the base body 60 through the mounting holes 65.

  Then, the end of the timing belt 28a inserted in advance in the subframe 36 and corresponding to the length of the spacer 20 is connected to the first through hole 46 of the one sub end block 16a, the third through hole 54 in the spacer 20, and the base body. The second through holes 66 in the order of 60 are inserted through the second through holes 66 and are once taken out of the base body 60. The end portion of the timing belt 28 a is reinserted into the second through hole 66 so as to circulate along the outer peripheral surface of the gear portion 26 a disposed in the base body 60.

  The end portion of the timing belt 28a is again inserted into the second through hole 66, the third through hole 54, and the first through hole 46 in order, and the inside of the first through hole 46 of the sub-end block 16a is inserted. The end portion is integrally connected to the mounting member 80 of the slider 24.

  Finally, the plate 76 is mounted in the plate mounting hole 74 of the base body 60 in which the second through hole 66 is opened, and the concave portion 70 in which the second through hole 66 and the connecting bolt 50 are inserted is closed.

  With such a configuration, the spacer 20 is interposed between the one sub-end block 16 a connected to the sub-frame 36 and the base body 60 provided with the rotation drive source 18 on the upper side via the connecting bolt 50. Can be easily connected.

  Therefore, when the slider 24 is displaced to the displacement end position, a sufficient separation distance between the rotary drive source 18 provided above the base body 60 and the slider 24 can be secured, and the slider 24 is mounted on the upper surface of the slider 24. A sufficient separation distance between the placed work 22 and the rotational drive source 18 can be secured. As a result, even when the slider 24 is displaced to the displacement end position and the workpiece 22 protrudes by a predetermined length toward the rotational drive source 18, the contact between the workpiece 22 and the rotational drive source 18 can be suitably prevented. (See FIG. 6).

  In other words, even when the work 22 placed on the slider 24 protrudes toward the rotation drive source 18, the rotation drive source 18 is protruded below the body 12 in order to avoid contact with the work 22. And there is no need to extend the end of the body 12 on the rotary drive source 18 side in the axial direction.

  Therefore, by providing the spacer 20, the contact between the work 22 and the rotational drive source 18 can be easily and inexpensively prevented.

  Further, since the spacer 20 can be manufactured from an extruded member similar to the base body 60, it is not necessary to prepare a separate member in advance and can be manufactured at low cost.

  Furthermore, by preparing a plurality of spacers 20 having different lengths along the axial direction in advance and exchanging each time according to the amount of protrusion of the work 22 placed on the slider 24 toward the rotary drive source 18 side, Contact between the workpiece 22 and the rotational drive source 18 can be prevented at low cost.

  The operation and effect of the electric actuator 10 in which the spacer 20 is integrally assembled between the base body 60 provided with the rotational drive source 18 and the sub-end block 16a connected to the body 12 will be described. .

  A current (for example, a pulse signal) is supplied to the rotational drive source 18 from a power source (not shown). As the rotary drive source 18 rotates based on the current, the gear portion 26 a provided on one end side of the body 12 rotates via the drive shaft 64. And the gear part 26b connected via the timing belt 28a rotates integrally under the rotation effect | action of the said gear part 26a, and the said timing belt 28a circulates.

  As a result, the slider 24 integrally connected to the timing belt 28a is displaced in the axial direction (arrow X direction) along the guide rail 38 of the body 12. Then, the end face plate 82a of the slider 24 comes into contact with the stopper bolt 86a of the stopper 84a to reach the displacement end position.

  At that time, even when the work 22 placed on the upper surface of the slider 24 protrudes from the end surface of the body 12 on the side of the rotational drive source 18 (see FIG. 6), as shown in FIG. Since the spacer 20 is provided between the base body 60 to which the 18 is mounted and the sub-end block 16a, the distance between the slider 24 and the rotary drive source 18 when the slider 24 is displaced to the displacement end position is set. It can be set large, and the contact between the workpiece 22 and the rotational drive source 18 can be prevented.

  Further, by reversing the polarity of the current supplied from a power source (not shown), the rotational drive source 18 rotates in the opposite direction, and the slider 24 integrally connected to the timing belt 28a is connected to the guide rail of the body 12. 38 is displaced in the axial direction (arrow Y direction). Then, the end face plate 82b of the slider 24 comes into contact with the stopper bolt 86b of the stopper 84b to be in the initial position.

  As described above, in the present embodiment, the spacer 20 having a predetermined length is sandwiched integrally between the base body 60 to which the rotational drive source 18 is mounted and the sub-end block 16a of the body 12 along the axial direction. Accordingly, as shown in FIG. 6, when the work 22 placed on the upper surface of the slider 24 is displaced to the displacement end position, the rotation drive source 18 and the work 22 are placed by the spacer 20. A sufficient distance from the slider 24 can be secured. In other words, as compared with the electric actuator 100 shown in FIG. 5, it is possible to ensure a large separation distance between the rotary drive source 18 and the slider 24 in the electric actuator 10.

  Therefore, even when the workpiece 22 protrudes toward the rotary drive source 18 with respect to the slider 24, the contact between the workpiece 22 and the rotary drive source 18 can be prevented.

  Further, by holding the spacer 20 between the base body 60 and the sub-end block 16a, the distance between the rotary drive source 18 and the slider 24 is changed without changing the length along the axial direction of the body 12. can do. For this reason, it is not necessary to form the body 12 according to the shape and size of the workpiece 22, so that the manufacturing cost of the body 12 can be reduced.

  In other words, even when the shape and size of the workpiece 22 conveyed by the slider 24 are different, for example, the spacers 20 having different lengths along the axial direction are replaced while the electric actuator 10 remains installed on a plane. By doing so, the separation distance between the rotation drive source 18 and the slider 24, that is, the work 22 can be changed easily.

  Furthermore, the spacer 20 is formed by an extrusion member by extrusion molding, similarly to the base body 60 provided with the rotation drive source 18. Therefore, since it is not necessary to prepare a separate member for forming the spacer 20, the spacer 20 can be manufactured at low cost.

  Furthermore, since the pushing member that forms the spacer 20 is formed in a long shape, when the work 22 conveyed by the slider 24 is displaced to the displacement end position, the rotational drive source from the end of the body 12 in the work 22 The length B (see FIG. 6) along the axial direction of the spacer 20 may be set according to the protrusion amount A (see FIG. 6) toward the 18 side (A ≦ B). That is, the spacer 20 can be easily formed by cutting the long extruded member into a desired length B along the axial direction satisfying the relationship of A ≦ B.

It is a perspective view of the electric actuator which concerns on embodiment of this invention. FIG. 2 is an exploded perspective view, partly omitted, of a base body, a spacer, and a rotation drive source on one end side of the electric actuator of FIG. 1. FIG. 2 is a partial longitudinal sectional view of a base body, a spacer, and a sub end block on one end side of the electric actuator of FIG. 1. It is a longitudinal cross-sectional view along the IV-IV line of FIG. It is a perspective view which shows the state in which the spacer of the electric actuator of a reference example is not provided. It is a schematic diagram which shows the state which the workpiece | work was mounted on the upper surface of the slider in the electric actuator of FIG. 1, and the said slider displaced to the displacement terminal position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100 ... Electric actuator 12 ... Body 14a, 14b ... End block 16a, 16b ... Sub end block 18 ... Rotation drive source 20 ... Spacer 22 ... Workpiece 24 ... Slider 26a, 26b ... Gear part 28, 28a ... Timing belt 30 ... Stopper mechanism 38 ... guide rail 46 ... first through hole 48 ... screw hole 50 ... connection bolt 52 ... screw portion 54 ... third through hole 56a, 56b ... engagement groove 58 ... opening portion 60 ... base body 66 ... second penetration Hole 68a, 68b ... Bolt groove 76 ... Plate 78 ... Table

Claims (3)

In the electric actuator that transmits the rotational driving force of the rotational driving unit to the slider via the driving force transmission belt,
Body,
A slider provided in the body so as to be displaceable along the axial direction, and for conveying a workpiece;
A rotation drive unit provided at one end of the body substantially orthogonal to the axis of the body and projecting toward the slider;
A separation member that is detachably held between the body and the rotation drive unit;
With
The electric actuator according to claim 1, wherein a separation distance along an axial direction of the body between the body and the rotation driving unit is changed by the separation member. The electric actuator according to claim 1, wherein
The separation member and the rotation driving unit are inserted into an insertion hole formed along an axial direction, and are integrally connected to the body via a connection bolt that is screwed to the body. Electric actuator. The electric actuator according to claim 1 or 2,
The rotational drive unit includes a rotational drive source that is rotationally driven by an electric current, and a base body to which the rotational drive source is attached and connected to the separation member, and the base body and the separation member are formed by extrusion molding. An electric actuator characterized by being formed from the same extruded member.

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