JP2010014210A - Motor driving device, assembly method for motor driving device, and assembly tool for motor driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor driving device, an assembly method of the motor driving device, and an assembly tool for the motor driving device capable of suspending a belt on a pulley without deteriorating work efficiency by simple configuration even if the pulley for transmitting driving force is fixed to the bottom face of a case to be hidden by an outer shell of a motor or the like. <P>SOLUTION: The motor 9 formed larger in a radial direction than a driving side pulley 10a or a driven side pulley 10b is disposed in an opening 21g side of a cap-like case 21, and a temporary holding part 212 temporarily holding the driving side pulley 10a and the driven side pulley 10b by inserting the driving side pulley 10a and the driven side pulley 10b into the cap-like case 21 in a state of suspending the pulley belt 10c is formed on an inner bottom face 210 of the cap-like case 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor drive device, a method for assembling the motor drive device, and an assembly jig for the motor drive device. More specifically, the present invention relates to a motor drive device including a pulley and a pulley belt for transmitting a drive force of the motor, and a motor drive. The present invention relates to an apparatus assembly method and an assembly jig for a motor drive device.

  Patent Document 1 (FIG. 3 and the like) describes a driving force transmission mechanism that transmits a driving force of a motor from a driving pulley that rotates integrally with a rotating shaft of the motor to a driven pulley via a belt.

  In such a configuration of Patent Document 1, since the driving pulley and the driven pulley are disposed in a state exposed from the case, various gears and the like for transmitting the driving force are fixed to the case, and then the driven side The operation of suspending the belt between the pulley and the driving pulley can be easily performed.

  However, it may be difficult to suspend the belt due to the design of a device on which such a transmission mechanism is mounted. For example, when the driving pulley and the driven pulley are fixed to the bottom surface of a bottomed cylindrical case (cap-like case), the driving pulley and the driven pulley are driven by a motor or various gears for transmitting driving force. The side pulley may be hidden. In other words, the pulley belt must be suspended in a state where the driving pulley and the driven pulley cannot be visually recognized, and there is a problem that workability is significantly deteriorated. On the other hand, if the opening for the pulley belt suspension work is provided on the bottom surface of the case and the pulley belt is suspended and then the opening is sealed with a lid or the like, the workability does not deteriorate as described above. . However, a separate sealing member such as an O-ring interposed between the lid and the case is necessary to ensure the sealing performance of the case, which increases the manufacturing cost.

JP 2001-326474 A

  In view of the above problems, the problem to be solved by the present invention is when the pulley for transmitting the driving force is fixed to the bottom surface of the case so as to be hidden behind the outer diameter of a large-diameter member such as a motor. Another object of the present invention is to provide a motor driving device, a motor driving device assembling method, and a motor driving device assembling jig capable of suspending a belt on a pulley with a simple configuration without deteriorating workability.

  In order to solve the above problems, a motor driving device according to the present invention includes a driving pulley driven by a motor and a driven side driven by rotation of the driving pulley on an inner bottom surface side of a bottomed cap-like case. In the motor drive device, wherein the drive side includes a pulley and a pulley belt that is suspended between the drive side pulley and the driven side pulley and transmits a driving force of the drive side pulley to the driven side pulley. A large-diameter member that rotatably supports the pulley or the driven-side pulley and is larger in the radial direction than the driving-side pulley or the driven-side pulley is disposed on the opening side of the cap-shaped case, and the large-diameter member Further, the driving pulley and the driven pulley are inserted into the cap-shaped case with the pulley belt suspended on the inner bottom surface side of the cap-shaped case. It is one in which the driving pulley and the driven pulley is summarized in that the temporary retaining portion to be temporarily held are formed.

  According to the motor drive device of the present invention, the pulley belt is suspended from the drive-side pulley and the driven-side pulley on the inner bottom surface of the cap-like case that houses the motor and the constituent members such as the drive-side pulley and the driven-side pulley. A temporary holding portion is formed which can temporarily hold these in a state of being applied. Therefore, even if the large-diameter member that is formed larger in the radial direction than the driving pulley or the driven pulley is disposed on the opening side of the cap-like case, each component member is assembled in advance to an assembly jig or the like. If the cap-like case is attached, the driving pulley and the driven pulley can be temporarily held on the inner bottom surface side of the cap-like case with the pulley belt suspended. Therefore, it is not necessary to carry out the suspension work of the pulley belt in a state where the driving pulley or the driven pulley cannot be visually recognized. Therefore, even when the driving pulley and the driven pulley are arranged on the inner bottom surface side of the cap-like case so as to be hidden behind the outer diameter member, the assembly operation of the motor driving device can be performed efficiently. .

  In this case, the temporary holding portion may be formed so that the driving pulley or the driven pulley can be temporarily held by movement in the insertion direction inserted from the opening side of the cap-like case.

  With this configuration, the drive pulley and the driven pulley can be temporarily held only by inserting the cap-like case into the assembly jig in which the respective components are temporarily assembled. The efficiency is further improved.

  A method for assembling a motor driving device according to the present invention includes pre-arranging a driving pulley fixed to an output shaft of a motor and a driven pulley rotated by the rotation of the driving pulley in an assembling jig, and A pulley belt is suspended and temporarily assembled between the driving pulley and the driven pulley, and each constituent member temporarily assembled in the assembly jig is inserted into a bottomed cap-like case, The gist is that the driving pulley and the driven pulley are fixed in the cap-like case in a state where a pulley belt is suspended between the driving pulley and the driven pulley.

  According to the method for assembling the motor driving device according to the present invention, before the driving pulley and the driven pulley are fixed to the cap-like case, the pulley belt is suspended in advance on the driving pulley and the driven pulley on the assembly jig. Since it can be temporarily assembled in the state, the efficiency of the assembly work of the motor drive device is improved.

  The motor driving apparatus assembly method according to the present invention includes a driving pulley fixed to an output shaft of a motor and a driven pulley that is rotationally driven by the rotation of the driving pulley in an assembly jig. In addition, a pulley belt is suspended and temporarily assembled between the driving pulley and the driven pulley, and a temporary holding portion that temporarily holds the driving pulley and the driven pulley in a state where the pulley belt is suspended is provided inside. After the cap-shaped case provided on the bottom surface is attached to each component member temporarily assembled in the assembly jig, the driving pulley and the driven pulley are temporarily held in the temporary holding portion, and thereafter The gist is that the assembly jig is removed from each of the constituent members.

  According to the method for assembling the motor drive device according to the present invention, before the drive side pulley and the driven pulley are temporarily held on the cap-like case, the pulley belt is suspended in advance on the drive side pulley and the driven side pulley on the assembly jig. Since the temporary assembly can be performed in this state, the efficiency of the assembly operation of the motor drive device is improved.

  In this case, after the assembly jig is removed from each of the constituent members, the driving pulley and the driven pulley may be configured to be fixed to the inner bottom surface.

  In this way, the assembly jig is removed while the driving pulley and the driven pulley are temporarily held in the cap-like case, so that the driving pulley and the driven pulley can be securely fixed while visually observing. it can.

  The assembly jig for the motor drive device according to the present invention has a pulley belt suspended between a drive pulley fixed to the output shaft of the motor and a driven pulley rotated by the rotation of the drive pulley. Each of these components is temporarily assembled when inserted into the cap-shaped case in a state where the driving pulley is fixed, and a first support portion that supports the motor The gist of the present invention is that a second support portion for supporting the driven pulley is provided.

  If comprised in this way, since a pulley belt can be easily suspended to a drive side pulley and a driven side pulley, the efficiency of the assembly operation of a motor drive device will improve.

  In this case, a positioning part for the cap-shaped case only needs to be provided in order to temporarily hold the constituent members at regular positions in the cap-shaped case.

  The inside of the cap-like case is directly observed so that each component of the motor drive device is arranged at a normal position in the cap-like case, and the cap-like case is attached while checking whether the direction is correct. It is difficult. According to such a configuration, the positioning member can easily perform positioning of each component member and the cap-shaped case.

  According to the motor driving device, the motor driving device assembling method, and the motor driving device assembling jig according to the present invention, the driving pulley and the driven pulley are placed on the inner bottom surface side of the cap-like case with the pulley belt suspended. It can be temporarily held. Therefore, it is not necessary to carry out the suspension work of the pulley belt in a state where the driving pulley or the driven pulley cannot be visually recognized. Therefore, even when the driving pulley and the driven pulley are arranged on the inner bottom surface side of the cap-like case so as to be hidden behind the outer diameter member, the assembly operation of the motor driving device can be performed efficiently. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram for explaining a configuration of a motor drive device 1 according to an embodiment of the present invention. Here, FIG. 1A is a plan view of the motor drive device 1, and FIG. 1B is a longitudinal sectional view showing a part of the motor drive device 1 in cross section. Note that the vertical direction in the following description refers to the vertical direction in FIG.

  First, the overall configuration of the motor drive device 1 will be described. The motor drive device 1 includes a motor 9, a transmission mechanism 10 that transmits the rotational power of the motor 9, and an axis L (center axis) based on the rotational drive of the motor 9 that is transmitted via the transmission mechanism 10. A rotating feed screw 6 and a movable body 7 that is linearly driven based on the rotation of the feed screw 6 are provided. These members are accommodated in the case 2, and the case 2 includes a cap-shaped case 21 and a main body case 22.

  Various motors such as a DC motor and a stepping motor can be applied to the motor 9 as a driving source. A motor mounting plate 90 for mounting the motor 9 is fixed to the motor 9. The motor 9 has an output shaft 9a disposed downward. The reason for this is that the motor 9 and the feed screw 6 are overlapped in the axial direction so that the size of the motor 9 and the feed screw 6 in the motor drive device 1 in the longitudinal direction (vertical direction) is reduced ( This is because when the output shaft 9a is disposed so as to face upward, the size of the motor driving device 1 is increased by the length of the motor 9.

  The transmission mechanism 10 is suspended from a driving pulley 10a fixed to the output shaft 9a of the motor 9, a driven pulley 10b provided at the proximal end of the feed screw 6, a driving pulley 10a and a driven pulley 10b. Pulley belt 10c. A timing belt is used as the pulley belt 10c. The transmission mechanism 10 configured as described above is disposed on the inner bottom surface 210 side of the cap-shaped case 21. Details of the configuration of the cap-shaped case 21 and the mounting structure of the motor 9 and the transmission mechanism 10 in the cap-shaped case 21 will be described later.

  The movable body 7 is engaged with the feed screw 6 to move linearly on the feed screw 6, the connecting shaft 4 extending upward from the carriage 5, and a disc shape connected to the tip of the connecting shaft 4. The output member 3 is provided.

  In the present embodiment, the motor 9, the transmission mechanism 10, the feed screw 6, the carriage 5, and the like are housed inside the case 2, and the output member 3 and the distal end side of the connecting shaft 4 (the output member 3 side of the connecting shaft). Are arranged outside the case 2 only. The feed screw 6 is rotatably held at one end by a driven pulley 10 b provided on the inner bottom surface 210 of the cap-shaped case 21 and at the other end by a circular recess 23 a provided at the upper surface 22 a of the main body case 22. A rotation prevention shaft 80 is arranged in parallel with the feed screw 6, and both ends of the rotation prevention shaft 80 are fixed to the inner bottom surface 210 of the cap-shaped case 21 and the upper surface 22 a of the main body case 22. Yes.

  A screw hole 5a is formed in the center of the carriage 5 which is a plate-like member, and a feed screw 6 is screwed into this screw hole. The carriage 5 is fixed with lower ends of three connecting shafts 4 arranged at equal intervals in the circumferential direction around the screw hole 5a. The output member 3 is fixed to the upper end portion of the connecting shaft 4. The carriage 5 is formed with a guide hole 5b through which the rotation prevention shaft 80 is inserted. When the feed screw 6 is rotated by the guide hole 5b and the rotation prevention shaft 80, the movable body 7 (carriage 5). A co-rotation preventing mechanism 8 for preventing co-rotation of these is configured. Therefore, when the feed screw 6 rotates, the movable body 7 moves on the feed screw 6 in the axis L direction while being guided in the axis L direction by the rotation prevention shaft 80.

  The motor drive device 1 includes detection means for detecting the amount of rotation of the feed screw 6. Four magnets 111 are fixed to the driven pulley 10b connected to the base end portion of the feed screw 6 at equal intervals of 90 degrees in the circumferential direction. On the other hand, the substrate 113 fixed to the cap-shaped case 21 is mounted with a rotation detection sensor 112 including a Hall IC including a Hall element and a signal processing IC. The magnet 111 and the rotation detection sensor 112 constitute a rotation detection device 11 (rotation detection means) that detects the rotation amount (rotation speed) and rotation direction of the feed screw 6.

  A magnet 121 is mounted on the upper surface of the carriage 5, and a magnetic sensor 122 including a Hall element is mounted on a substrate 123 fixed in the case 2, and includes the magnet 121 and the magnetic sensor 122. The position detection device 12 can detect whether the carriage 5 has reached the lowermost side (retracted end).

  The main body case 22 constituting the case 2 is a bottomed cylindrical body 22a having a bottom surface 23, and a flange 22c is formed at the lower end of the cylindrical body 22a. Three mounting holes 22d are formed in the flange portion 22c at equal intervals in the circumferential direction.

  A central portion of the bottom surface 23 is formed with a bottomed circular concave portion 23a that is recessed upward, and this circular concave portion 23a rotatably supports the small-diameter portion 6a formed at the upper end portion of the feed screw 6. It has become a bearing. On the bottom surface 23, around the circular recess 23a, three through holes 23d through which the three connecting shafts 4 pass are formed at equal intervals in the circumferential direction. Since the connecting shaft 4 moves forward and backward through the through hole 23d, the bottom surface 23 is formed of a resin material having excellent slidability.

  The cap-shaped case 21 is a cylindrical body having a bottom that is slightly larger than the main body case 22, and a concave portion 211 that is recessed downward is formed on the inner bottom surface 210. On the other hand, a flange 21c that overlaps with the flange 22c of the main body case 22 is formed on the opening 21g side. The flange 21c is formed with boss portions 21b having holes 21a at three positions overlapping with the holes 211c formed in the circumferential direction on the flange 22c of the main body case 22, and a tapping screw 24 is provided in the hole 21a. The cap-like case 21 and the main body case 22 are connected by screwing. Further, attachment holes 21 d are formed at three positions at positions overlapping with the attachment holes 22 d formed in the flange portion 22 c of the main body case 22. The motor driving device 1 is fixed to the mounting target device 19 using the mounting holes 22d and the mounting holes 21d.

  Such a cap-shaped case 21 is provided with a motor 9, a transmission mechanism 10, and the like. Hereinafter, a specific configuration of the cap-shaped case 21 will be described.

  FIG. 2 is a perspective view as seen from the opening side of the inner bottom surface 210 of the cap-shaped case 21. The inner bottom surface 210 of the cap-shaped case 21 is provided with a temporary holding portion 212 for temporarily holding the driving pulley 10a and the driven pulley 10b. In the present embodiment, the temporary holding part 212 includes an annular protrusion 212a and a positioning protrusion 212b described below.

  A concave portion 211 is formed in the approximate center of the inner bottom surface 210 of the cap-shaped case 21. An annular protrusion 212 a having a predetermined size is formed in the recess 211. Although details will be described later, the driven pulley 10b is rotatably fitted to the annular protrusion 212a via the ball bearing 14. In addition, two positioning protrusions 212 b are formed on the inner bottom surface 210 of the cap-shaped case 21. A motor mounting plate 90 fixed to the motor 9 is engaged with the positioning protrusion 212b. As a result, the drive pulley 10a is temporarily temporarily held by the cap-shaped case 21.

  Further, a female screw portion 212c is formed in the vicinity of each positioning projection 212b. Further, a substrate holding portion 212d into which the substrate 113 is fitted is formed adjacent to the recess 211.

  A method for assembling the motor 9, the transmission mechanism 10 and the like to the cap-shaped case 21 having such a shape will be described below.

  In the present embodiment, the assembly jig 15 is used when attaching the motor 9, the transmission mechanism 10, and the like to the inner bottom surface 210 of the cap-shaped case 21. FIG. 3 is an external perspective view of the assembly jig 15, and FIG. 4 is an external perspective view showing a state where the motor 9, the transmission mechanism 10, and the like are temporarily assembled to the assembly jig 15. The assembly jig 15 includes a first support portion 151, a second support portion 152, and a positioning portion 153 on the base 150.

  The first support portion 151 is a support portion for supporting the motor 9, and includes four guide shafts 151 a to 151 d erected vertically on the base 150 and a motor cradle 151 e. As shown in FIG. 4, the motor 9 is mounted on the motor cradle 151e with the output shaft 9a to which the driving pulley 10a is fixed facing upward and the outer peripheral surface being guided by the guide shafts 151a to 151d. The

  The second support part 152 is a support part for supporting the driven pulley 10b. As shown in FIG. 4, the driven pulley 10 b is placed on the tip of the second support portion 152 with the ball bearing 14 fixed in advance. A pulley belt 10 c is suspended between the driven pulley 10 b and a driving pulley 10 a fixed to the output shaft 91 of the motor 9.

  A substrate support shaft 154 is provided on the base 150. A groove 154 a is formed at the tip of the substrate support shaft 154. On the other hand, a groove 1510d is formed at the tip of one guide shaft 151d among the four guide shafts 151a to 151d. The groove 1510d is formed such that its longitudinal direction is located on the same straight line as the groove 154a of the substrate support shaft 154. As shown in FIG. 4, the above-described substrate 113 is placed in the grooves 154a and 1510d.

  In this manner, the cap-like case 21 is attached to the assembly jig 15 in a state in which the constituent members such as the motor 9 are temporarily assembled to the assembly jig 15. At this time, the three attachment holes 21d formed in the flange portion 21c of the cap-shaped case are engaged with and attached to the three positioning portions 153 provided on the assembly jig 15.

  When the cap-like case 21 is attached in this manner, the above-described constituent members are temporarily held by the temporary holding portion 212 of the cap-like case 21. Specifically, the motor 9 and the driving pulley 10 a fixed to the motor 9 are provided with positioning protrusions 212 b in which two temporary holding holes 91 formed in the motor mounting plate 90 are provided on the inner bottom surface 210 of the cap-shaped case 21. Is temporarily held by being engaged. Further, the driven pulley 10 b is temporarily held by an annular protrusion 212 a formed in the recess 211 of the cap-shaped case 21 via the ball bearing 14. The substrate 113 temporarily assembled in the assembly jig 15 is press-fitted into the substrate holding portion 212d of the cap-shaped case 21 and held.

  In the present embodiment, even if the opening 21g of the cap-shaped case 21 is placed downward, each component member is in a state (temporary holding state) so that it does not fall off from the cap-shaped case 21 due to gravity. Therefore, the positioning projection 212b is formed in a size that is press-fitted with a predetermined strength into the temporary holding hole 91 of the motor mounting plate 90 so that the temporary holding state of each component member can be maintained. Further, the annular protrusion 212a is formed to have a dimension that allows the ball bearing 14 fixed to the driven pulley 10b to be press-fitted with a predetermined strength. However, as described above, each component does not necessarily have to be in a state where it does not fall off from the cap-shaped case 21 due to gravity. At least “temporary holding” in the present invention refers to a state in which the pulley belt 10c can hold the state suspended from the driving pulley 10a and the driven pulley 10b, and the driving pulley 10a and the driven pulley 10b. However, it is not necessary for the cap-shaped case 21 to fall off due to gravity.

  After each component member is temporarily held by the temporary holding portion 212 of the cap-shaped case 21, the assembly jig 15 is removed and permanently fixed. Specifically, as shown in FIG. 4, as shown in FIG. 5, bolts 99 are inserted into the two main fixing holes 92 formed in the motor mounting plate 90, and screwed into the female screw portion 212 c described above. Thus, the motor mounting plate 90 is permanently fixed to the cap-shaped case 21, whereby the motor 9 and the driving pulley 10a fixed to the motor 9 are permanently fixed. On the other hand, as shown in FIG. 1B, the driven pulley 10b is in a state where the pulley belt 10c is suspended between the driving pulley 10a and the feed screw 6 (the base end side thereof), and a cap-like case. The main body case 22 and the cap-shaped case 21 are fixed to the inner bottom surface 210 of the cap-shaped case 21 by being screw-fixed in a state of being sandwiched between the inner bottom surfaces 210 of 21. In this way, each constituent member is permanently fixed to the cap-shaped case 21.

  That is, the connecting shaft 4, the rotation preventing shaft 80, and the like are disposed at predetermined positions, the main body case 22 is attached to the cap-shaped case 21, and then the output member 3 is fixed to the tip of the connecting shaft 4. Thus, the driven pulley 10 b is permanently fixed to the inner bottom surface 210 of the cap-shaped case 21.

  Such an assembling method according to the present embodiment is an example and can be appropriately changed. That is, in the above assembling method, the driving pulley 10a and the driven pulley 10b (each component member) are temporarily held by the cap-like case 21 and then fixed by the connecting shaft 4 or the like. However, it is not always necessary to temporarily hold the cap-shaped case 21. Specifically, the drive-side pulley 10 a and the driven-side pulley 10 b may be fixed to the cap-shaped case 21 by attaching the cap-shaped case 21.

  According to the motor drive device 1, the assembly method of the motor drive device 1, and the assembly jig 15 configured as described above, the following effects can be obtained.

  As shown in FIG. 5, the motor driving device 1 according to the present embodiment corresponds to a motor 9 (a large-diameter member in the present invention) that is larger in the radial direction than the driving pulley 10 a on the opening 21 g side of the cap-like case 21. ) Is disposed. Therefore, if the motor 9 and the transmission mechanism 10 are directly assembled to the cap-shaped case 21, the driving pulley 10a cannot be visually recognized at all by the motor 9, so that the suspension work of the pulley belt 10c is difficult, and the working efficiency is remarkably reduced. However, in the present embodiment, the pulley belt 10c is temporarily held in a state where the pulley belt 10c is suspended from the inner pulley 210a of the cap-like case 21 in which the constituent members are accommodated and the driven pulley 10a and the driven pulley 10b. Temporary holding portions 212 (annular protrusions 212a and positioning protrusions 212b) are formed. Therefore, if each component is assembled in advance to the assembly jig 15 and the cap-shaped case 21 is attached, the driving pulley 10a and the driven pulley 10b are connected to the cap-shaped case 21 with the pulley belt 10c suspended. It can be temporarily held on the inner bottom surface 201 side. Therefore, the pulley belt 10c can be easily suspended from the driving pulley 10a and the driven pulley 10b. That is, even when the driving pulley 10a is hidden by the motor 9, the assembling work of the motor driving device 1 can be performed efficiently.

  Further, the annular protrusion 212a and the positioning protrusion 212b, which are the temporary holding portions 212, are mere convex portions and have a shape that can be integrally formed with the cap-shaped case 21, so that the manufacturing cost of the motor drive device 1 increases. There is nothing.

  Further, the assembly jig 15 is provided with a positioning portion 153 that engages with the mounting hole 21 d of the cap-shaped case 21 in order to temporarily hold the above-described constituent members at regular positions in the cap-shaped case 21. As a result, the cap-shaped case 21 is directly observed so that the constituent members of the motor drive device 1 are arranged at regular positions in the cap-shaped case 21, and the cap-shaped case is confirmed while checking whether the direction is correct. It is not necessary to perform the attaching operation 21, and the positioning of each component member and the cap-shaped case 21 can be easily performed.

  Further, in the present embodiment, the cap-shaped case 21 is attached to the assembly jig 15 in the direction in which each of the constituent members is inserted (press-fitted) into the annular protrusion 212a and the positioning protrusion 212b constituting the temporary holding portion 212. The direction is the same. Therefore, since each component is automatically held temporarily by the temporary holding part 212 by attaching the cap-shaped case 21 to the assembly jig 15, it is excellent in workability.

  Hereinafter, the operation of the motor drive device 1 will be briefly described with reference to FIG. First, when a predetermined drive signal is sent to the motor 9 from an external drive device (not shown), the motor 9 rotates. The rotation of the motor 9 is transmitted to the feed screw 6 via the transmission mechanism 10. When the feed screw 6 is rotated by the co-rotation preventing mechanism 8, the carriage 5 is prevented from co-rotating, so that the carriage 5 linearly moves in the direction of the axis L of the feed screw 6 based on the rotation of the feed screw 6. Since the carriage 5 is fixed integrally with the output member 3 via the connecting shaft 4, the carriage 5 and the output member 3 operate as the movable body 7 together. Therefore, the output member 3 moves linearly outside the case 2 based on the linear movement of the carriage 5.

  Meanwhile, the motor drive device 1 detects the rotation speed of the feed screw 6 and the position of the carriage 5 based on the outputs from the rotation detection device 11 and the position detection device 12, and based on the detection result, the output member 3. The position can be detected. Therefore, the output member 3 can be moved to a desired position in the stroke at a desired timing by appropriately controlling the rotation direction, rotation speed, and rotation amount of the motor 9. It is also possible to perform control such as driving the carriage 5 at a low speed near the bottom dead center and the top dead center of the feed screw 6 and driving the carriage 5 at a high speed in the intermediate region.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, the motor driving device 1 has a configuration in which the driving pulley 10a is hidden by the motor 9 that is a large-diameter member, but at least one of the driving pulley 10a and the driven pulley 10b on which the pulley belt 10c is suspended. Any structure may be used as long as one is hidden by the large-diameter member. In addition, the large-diameter member disposed so as to cover the driving pulley 10a or the driven pulley 10b is not limited to the motor 9. For example, a configuration in which the driving pulley 10a or the driven pulley 10b is hidden by a gear for transmitting the driving source of the motor 9 can be used. As described above, if the large diameter member disposed on the opening 21g side of the cap-like case 21 prevents the suspension work of the pulley belt 10c with respect to the driving pulley 10a and the driven pulley 10b, The technical idea of the present invention is effective.

  Moreover, the structure of the assembly jig 15 demonstrated by the said embodiment can be changed suitably. In other words, the motor 9 (the driving pulley 10a) and the driven pulley 10b can be temporarily assembled in a predetermined positional relationship, and the pulley belt 10c can be easily suspended in the temporarily assembled state. That's fine.

It is a figure for demonstrating the structure of the motor drive device which concerns on embodiment of this invention, Fig.1 (a) is a top view of a motor drive device, FIG.1 (b) is a longitudinal cross-sectional view of a motor drive device. It is an external appearance perspective view for demonstrating the shape of the inner bottom face of a cap-shaped case. It is an external appearance perspective view of the assembly jig used in order to assemble the motor drive unit shown in FIG. FIG. 4 is an external perspective view illustrating a state where a motor, a transmission mechanism, and the like are temporarily assembled in the assembly jig illustrated in FIG. 3. It is the schematic for demonstrating the state inside a cap-shaped case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor drive device 21 Cap-shaped case 210 Inner bottom face 212 Temporary holding | maintenance part 212a Annular protrusion 212b Positioning protrusion 21g Opening 9 Motor 9a Output shaft 10a Drive side pulley 10b Driven side pulley 10c Pulley belt 15 Assembly jig 151 First support part 152 Second support

Claims (7)

A drive-side pulley driven by a motor, a driven pulley driven by rotation of the drive-side pulley, and between the drive-side pulley and the driven-side pulley on the inner bottom side of the bottomed cap-like case In the motor drive device provided with a pulley belt that is suspended and transmits a driving force of the driving pulley to the driven pulley,
The driving pulley or the driven pulley is rotatably supported, and a large-diameter member formed larger in the radial direction than the driving pulley or the driven pulley is disposed on the opening side of the cap-shaped case, A temporary holding portion is formed on the inner bottom surface side of the cap-shaped case from the large-diameter member to hold the driving pulley and the driven pulley while the pulley belt is suspended. A motor drive device.   2. The temporary holding portion is formed so that the driving pulley or the driven pulley can be temporarily held by movement in an insertion direction inserted from the opening side of the cap-like case. The motor drive device described in 1. A driving pulley fixed to the output shaft of the motor and a driven pulley that is rotationally driven by the rotation of the driving pulley are arranged in advance in an assembly jig, and the pulley is disposed between the driving pulley and the driven pulley. Suspend the belt and temporarily assemble,
Each component member temporarily assembled in the assembly jig is inserted into a bottomed cap-shaped case, and the driving pulley and the driving pulley are suspended between the driving pulley and the driven pulley. An assembly method for a motor drive device, wherein the driven pulley is fixed in the cap-like case. A driving pulley fixed to the output shaft of the motor and a driven pulley that is rotationally driven by the rotation of the driving pulley are arranged in advance in an assembly jig, and the pulley is disposed between the driving pulley and the driven pulley. Suspend the belt and temporarily assemble,
The pulley belt is formed by attaching a cap-like case having a temporary holding portion for temporarily holding the driving pulley and the driven pulley on an inner bottom surface of each component member temporarily assembled in the assembly jig. Is temporarily held by the temporary holding portion with the driving pulley and the driven pulley in a suspended state,
After that, the assembly method of the motor drive device is characterized in that the assembly jig is removed from each of the constituent members.   5. The method of assembling a motor drive device according to claim 4, wherein the drive side pulley and the driven side pulley are fixed to the inner bottom surface after the assembly jig is removed from each of the constituent members. A method for assembling the motor driving device.   When inserting into a cap-like case in a state where a pulley belt is suspended between a driving pulley fixed to the output shaft of the motor and a driven pulley rotated by the rotation of the driving pulley, The structural members are pre-assembled, and include a first support portion that supports the motor in a state where the driving pulley is fixed, and a second support portion that supports the driven pulley. An assembly jig for a motor driving device.   7. An assembly jig for a motor drive device according to claim 6, wherein a positioning portion for the cap-shaped case is provided to temporarily hold each of the constituent members at a regular position in the cap-shaped case. .

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