Motor-driven reciprocation device

Abstract

To provide a motor-driven reciprocation device in which a rotational shaft can be easily and surely earthed.SOLUTION: The present invention includes: a motor 60; a conductive rotational shaft 70 having a spiral groove 71 and rotationally driven by the motor 60; a movable body 80 that reciprocates in a rotational axial direction L of the rotational shaft 70 along with the rotation of the rotational shaft 70 by being engaged with the spiral groove 71 of the rotational shaft 70; a conductive attachment panel 30 supporting one end on a side connecting a motor 60 of the rotational shaft 70 and the other end of the rotational shaft 70; and a bearing member 110 made of synthetic resin having a bearing hole 121 that is attached to the attachment panel 30 and in which the other end of the rotational shaft 70 is inserted to rotationally support. The bearing hole 121 is composed of a through hole. There are provided: a tip end face of a shaft part 75 of the rotational shaft 70 inserted into the bearing hole 121; and a conductive member 130 which brings an electric conductivity between the end faces 39 of the attachment panel 30 to which the bearing member 110 is attached. The conductive member 130 includes a resilient member 131 and a ball 133.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a motor-driven reciprocating device that reciprocates a moving body by a rotating shaft connected to a motor.

Background Art

[0002] Conventionally, for example, as a reciprocating feed mechanism for various detection devices such as slide-type electronic components and a reciprocating feed mechanism for an optical head in OA equipment, a motor-driven reciprocating device driven by a motor has been used.

[0003] This type of motor-driven reciprocating device is configured to include, for example, as shown in Patent Document 1, a motor (30), a rotating shaft (40) that is rotationally driven by the motor (30), and a moving body (60) that engages with a spiral groove (41) provided on the rotating shaft (40) and reciprocates in the axial direction (B) of the rotating shaft (40) as the rotating shaft (40) rotates.

[0004] In the above conventional motor-driven reciprocating device, in order to rotatably support the end portion of the rotating shaft (40) on the opposite side where the motor (30) is attached, the shaft portion (43) of the rotating shaft (40) is inserted into the shaft support hole (53) of a synthetic resin-made rotating shaft support member (50) attached to the support plate portion (15) of the base (10).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the motor-driven reciprocating device having the above structure, since the end portion of the rotating shaft (40), which is a conductor penetrating substantially the entire length of the motor-driven reciprocating device, is supported by a rotating shaft support member (50) which is an insulator, etc., it is electrically floating (grounding is not reliable). Therefore, when an electrostatic test (a test for measuring the influence generated when static electricity is applied to the product) is performed, there is a possibility that favorable results may not be obtained due to secondary discharge of the rotating shaft (40) or the like.

[0007] The present invention has been made in view of the above points, and an object thereof is to provide a motor-driven reciprocating device capable of easily and surely grounding a rotating shaft.

Means for Solving the Problems

[0008] The present invention includes a motor, a conductive rotating shaft having a spiral groove and rotationally driven by the motor, a moving body engaged with the spiral groove of the rotating shaft and reciprocating in the axial direction of the rotating shaft as the rotating shaft rotates, one end of the rotating shaft on the side connecting the motor, a conductive mounting plate supporting the other end of the rotating shaft, and a synthetic resin bearing member attached to the mounting plate and having a bearing hole for inserting the other end of the rotating shaft and rotatably supporting it. The motor-driven reciprocating device is characterized by further comprising a conducting member that electrically conducts between the other end of the rotating shaft inserted into the bearing hole of the bearing member and the mounting plate to which the bearing member is attached. According to the present invention, since the conductive rotating shaft and the conductive mounting plate are conducted by the conducting member, the rotating shaft can be easily and surely grounded by grounding the mounting plate.

[0009] In addition to the above features, the present invention is characterized in that the bearing hole of the bearing member is a through hole, and the conducting member includes a resilient member having conductivity that is inserted into the bearing hole and elastically conducts between the other end of the rotating shaft and the mounting plate. According to the present invention, since electrical conduction is achieved while elastically biasing between the rotating shaft and the mounting plate by an elastic member having conductivity, the electrical conduction can be surely performed. In addition, since the elastic member always elastically biases the rotating shaft in a direction away from the mounting plate, play in the axial direction of the rotating shaft does not occur. Therefore, the reciprocating movement of the moving body can be smoothly performed without play, and the operating feel can be improved.

[0010] In addition to the above features, the present invention is characterized in that the electrical conduction member further includes a conductive ball that is installed between the other end of the rotating shaft and the elastic member and is elastically contacted with the other end of the rotating shaft. According to the present invention, since a ball is elastically contacted with the end of the rotating shaft, the contact between the end of the rotating shaft and the electrical conduction member can always be surely performed even when the rotating shaft rotates, and the electrical conduction between the rotating shaft and the mounting plate can be surely performed. At the same time, since the contact between the rotating shaft and the ball is a point contact, the resistance during rotation of the rotating shaft can be reduced.

[0011] In addition to the above features, the present invention is characterized in that the mounting plate includes a mounting plate main body portion arranged along the rotating shaft, and a pair of end face portions formed by bending both end portions of the mounting plate main body portion and installed at opposing positions. One end face portion of the pair of end face portions supports one end on the side where the motor of the rotating shaft is connected, and the bearing member that rotatably supports the other end of the rotating shaft is attached to the other end face portion of the pair of end face portions.

Effects of the Invention

[0012] According to the present invention, the rotating shaft can be easily and surely grounded.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 are views showing a motor-driven reciprocating device 10 according to this embodiment. FIG. 1 is a perspective view seen from above, FIG. 2 is a perspective view seen from below, FIG. 3 is a schematic enlarged view of the A-A cross section in FIG. 1, FIG. 4 is a schematic enlarged view of the main part of the B-B cross section in FIG. 1, and FIG. 5 is an enlarged exploded perspective view of the vicinity of the bearing member 110 shown in FIG. 2.

[0015] As shown in these figures, the motor-driven reciprocating device 10 includes a mounting plate 30, a motor 60 installed on one side of the mounting plate 30, a rotating shaft 70 installed along the lower surface side of the mounting plate 30 and rotationally driven by the motor 60, a moving body 80 that reciprocates in the axial direction L of the rotating shaft 70 as the rotating shaft 70 rotates, a moving body guide member 100 fixed to the lower surface of the mounting plate 30 for guiding the reciprocating movement of the moving body 80, and a bearing member 110 that rotatably supports the end of the rotating shaft 70 on the opposite side to where the motor 60 is installed. Further, in this embodiment, as shown by the dotted line in FIG. 3, an operating device 200 such as a slide-type electronic component operated by the reciprocating movement of the moving body 80 is installed on the motor-driven reciprocating device 10. In the following description, "up" refers to the direction of looking from the moving body 80 toward the mounting plate 30 side, and "down" refers to the opposite direction. Also, "front" refers to the direction of looking from the motor 60 toward the moving body 80, and "rear" refers to the opposite direction. However, these directions are not intended to limit the directions when using the motor-driven reciprocating device 10.

[0016] The mounting plate 30 is composed of a substantially rectangular long metal plate and includes a mounting plate main body portion 31 arranged along the rotation axis 70, a pair of side plates 33, 35 formed by bending the left and right sides (longitudinal sides) upward in the rotation axis direction L of the mounting plate main body portion 31, and a pair of end face portions 37, 39 formed by bending the front and rear sides (short sides) of the mounting plate main body portion 31 downward and installed at opposing positions.

[0017] A pair of arm insertion holes 41, 41 are formed in the mounting plate main body portion 31 parallel to its longitudinal direction (rotation axis direction L). The outer surface of one end face portion 37 serves as a motor mounting surface 45, and a motor insertion hole 51 is formed at its center. The inner surface of the other end face portion 39 serves as a bearing member mounting surface 53. As shown in FIG. 5, a bearing member support hole 55 composed of three arc-shaped through holes is formed near the center thereof, and bearing member locking holes 57 composed of rectangular through holes are formed on both the left and right outer sides of these three bearing member support holes 55.

[0018] One end face of the motor 60 is fixed to the motor mounting surface 45 of the mounting plate 30. As shown in FIG. 4, the drive shaft 61 of the motor 60 passes through the motor insertion hole 51 of the end face portion 37 and protrudes inside it, and its tip is connected to one end of the rotation axis 70 via a resin-made connecting member 65.

[0019] Here, the connecting member 65 is formed by molding synthetic resin into a substantially cylindrical shape, and is provided with a rotation shaft fixing recess 67 for inserting and fixing the drive shaft 61 at one end face thereof, and a rotation shaft fixing recess 69 for inserting and fixing a shaft portion 73 protruding from one end of the rotation axis 70 at the other end face thereof.

[0020] The rotating shaft 70 is a lead screw configured by forming a spiral groove 71 over the entire length of its outer peripheral surface. Shaft portions 73 and 75 protruding in a rod shape are provided at both ends of the rotating shaft 70. As a result, one end of the rotating shaft 70 is fixed to the connecting member 65 as described above, and the other end of the rotating shaft 70 is rotatably held by the bearing member 110. Note that, instead of directly connecting to the motor 60 as in this embodiment, the rotating shaft 70 may be configured to be connected to the motor 60 via a rotational power transmission mechanism.

[0021] The moving body 80 is not a main part of the present invention, so its detailed description is omitted. The moving body 80 has a groove engaging portion that engages with the spiral groove 71 of the rotating shaft 70. When the rotating shaft 70 rotates, the groove engaging portion moves within the spiral groove 71, so that the entire moving body 80 is configured to move in the rotational axis direction L of the rotating shaft 70. A pair of arm portions 81, 81 protrude from the upper surface of the moving body 80. These pair of arm portions 81, 81 are inserted into the arm insertion holes 41, 41 of the mounting plate 30 and protrude to the upper surface side of the mounting plate 30 and engage with the operating device 200 shown in FIG. 3. As shown in FIG. 3, a pair of rail locking portions 83, 83 protruding inward are provided at the inner positions of the both arm portions 81, 81 on the upper surface of the moving body 80 for locking the moving body 80 to the rail portions 101, 101 of the moving body guide member 100 described below.

[0022] The moving body guide member 100 is formed of a synthetic resin plate having a substantially flat plate rectangular shape and elongated in the rotational axis direction L. Rail portions 101, 101 extending in the rotational axis direction L are provided on both the left and right sides of the moving body guide member 100. These rail portions 101, 101 place the rail locking portions 83, 83 of the moving body 80 on their upper surfaces and hold them slidably in the rotational axis direction L. The moving body guide member 100 is attached to the lower surface of the mounting plate main body portion 31 by fixing means (not shown).

[0023] The bearing member 110 is a molded product formed by molding a synthetic resin into a substantially rectangular shape. One surface thereof is used as an end surface mounting surface 111 that abuts against the bearing member mounting surface 53 of the mounting plate 30, and the other surface is used as a rotating shaft support surface 113 for mounting the rotating shaft 70. At the center of the end surface mounting surface 111, three support protrusions 115 (only two are shown in FIG. 5) are provided, which are respectively inserted into and positioned in the three arc-shaped bearing member support holes 55 provided in the end surface portion 39. Further, from the vicinity of both left and right sides of the end surface mounting surface 111, a pair of locking portions 117 (only one of which is shown in FIG. 5) having elasticity and protruding in the direction of the end surface portion 39 in a claw shape are respectively locked to the pair of bearing member locking holes 57 provided in the end surface portion 39 in a snap-in manner.

[0024] At the center of the rotating shaft support surface 113 of the bearing member 110, a cylindrical shaft support protrusion 119 protruding from the rotating shaft support surface 113 is provided, and at the center thereof, a bearing hole 121 having a dimensional shape for rotatably inserting the shaft portion 75 of the rotating shaft 70 is formed. This bearing hole 121 is provided so as to penetrate to the end surface mounting surface 111.

[0025] Inside the shaft support hole 121, an elastic member 131 made of a metal coil spring and a metal ball 133 installed between the elastic member 131 and the end face of the shaft portion 75 are housed. Here, the elastic member 131 and the ball 133 are referred to as a conducting member 130.

[0026] As shown in FIG. 3, the operating device 200 is installed on the mounting plate 30 made of a metal plate, engages with the pair of arm portions 81, 81 of the moving body 80 as described above, and is operated as the arm portions 81, 81 move. However, since it is not a main part of the present invention, its detailed description is omitted.

[0027] To assemble the motor-driven reciprocating movement device 10, for example, the moving body guide member 100 is fixed to the lower surface of the mounting plate main body portion 31 of the mounting plate 30 by fixing means (not shown). Further, the surface of the drive shaft 61 of the motor 60 on the protruding side is brought into contact with and fixed to the motor mounting surface 45 of the end face portion 37 of the mounting plate 30. At this time, the drive shaft 61 protrudes to the opposite surface side of the end face portion 37 through the motor insertion hole 51.

[0028] On the other hand, the end face mounting surface 111 of the bearing member 110 is brought into contact with the bearing member mounting surface 53 of the end face portion 39 of the mounting plate 30. At this time, the respective support protrusions 115 of the bearing member 110 are inserted into the respective bearing member support holes 55 of the end face portion 39 for positioning, and at the same time, the respective locking portions 117 are snap-fitted into the respective bearing member locking holes 57 of the end face portion 39 for fixing.

[0029] Also, the rotary shaft 70 is passed through and mounted on the moving body 80 while engaging the rotary shaft 70 with the moving body 80 so that a groove engaging portion (not shown) of the moving body 80 is screwed into the spiral groove 71 of the rotary shaft 70.

[0030] Next, one shaft portion 73 of the rotary shaft 70 is inserted into and fixed to the rotary shaft fixing recess 69 of the connecting member 65, and the drive shaft 61 of the motor 60 is inserted into and fixed to the rotary shaft fixing recess 67 of the connecting member 65.

[0031] Next, with the elastic member 131 and the ball 133 inserted into the bearing hole 121 of the bearing member 110 attached to the end face portion 39 of the mounting plate 30, the other shaft portion 75 of the rotary shaft 70 is rotatably inserted into the bearing hole 121 and pivotally supported.

[0032] At this time, the pair of arm portions 81 of the moving body 80 penetrate through the pair of arm insertion holes 41 of the mounting plate 30 and are locked to a predetermined portion of the operating device 200.

[0033] The assembly of the motor-driven reciprocating movement device 10 is completed as described above. Needless to say, the above assembly procedure is an example, and it may be assembled using various other different assembly procedures.

[0034] As shown in FIG. 4, in the assembled motor-driven reciprocating device 10, a conductive rotating shaft 70 is electrically connected to an end surface portion 39 of a conductive mounting plate 30 via a conductive member 130 composed of a conductive ball 133 and an elastic member 131.

[0035] When the motor 60 is driven, the connecting member 65, the rotating shaft 70, and the drive shaft 61 rotate together, and a moving body 80 screwed onto the rotating shaft 70 moves in the rotational axis direction L. Along with this, an arm portion 81 of the moving body 80 moves, and the operating device 200 is driven. Conversely, by driving the operating device 200 side to move the arm portion 81 of the moving body 80, the rotating shaft 70 can be rotationally driven and this rotational force can be utilized.

[0036] As described above, according to the motor-driven reciprocating device 10, since the conductive rotating shaft 70 and the conductive mounting plate 30 are electrically connected by the conductive member 130, by grounding the mounting plate 30, the rotating shaft 70 can be easily and surely grounded. As a result, when the electrostatic test of the motor-driven reciprocating device 10 is performed, there is no risk of static electricity accumulating on the rotating shaft 70, and a suitable result can be obtained.

[0037] Further, according to the motor-driven reciprocating device 10, since the conductive elastic member 131 electrically connects the rotating shaft 70 and the mounting plate 30 while elastically pressing them, the electrical connection can be surely performed. Also, since the elastic member 131 always elastically presses the rotating shaft 70 in a direction away from the end surface portion 39 of the mounting plate 30, play in the rotational axis direction L does not occur in the rotating shaft 70. Therefore, the reciprocating movement of the moving body 80 can be smoothly performed without play, and the operating feel can be improved.

[0038] Furthermore, since the ball 133 is elastically contacted with the end of the rotating shaft 70, even if the rotating shaft 70 rotates, the contact between the rotating shaft 70 and the conductive member 130 can always be surely made, and the conduction between the rotating shaft 70 and the mounting plate 30 can be surely performed. In other words, it is a suitable structure for always surely conducting between the rotating rotating shaft 70 and the stationary mounting plate 30. At the same time, since the contact between the rotating shaft 70 and the ball 133 is a point contact, the resistance during the rotation of the rotating shaft 70 is small, and the rotation of the rotating shaft 70 can be performed with low resistance.

[0039] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the technical idea described in the claims, the specification, and the drawings. Note that any shape, structure, or material not directly described in the specification and the drawings is within the scope of the technical idea of the present invention as long as the functions and effects of the present invention are achieved. For example, the operating device 200 is not limited to a slide-type electronic component, and may be used as a reciprocating feed mechanism of various other detection devices, a reciprocating feed mechanism such as an optical head in various OA devices, and the like.

[0040] In the above embodiment, the mounting plate 30, the rotating shaft 70, the elastic member 131, and the ball 133 are made of metal, but they may be made of materials other than metal as long as they are conductive materials, or may be those in which a conductive material is plated on the surface of an insulating material. Further, the elastic member 131 constituting the conductive member 130 is not limited to a coil spring, and may be a spring having another structure such as a leaf spring. The ball 133 may not be spherical but may have various other shapes.

[0041] In addition, the embodiments described above and shown in the respective figures can be combined with each other's description content as long as there is no contradiction in their purposes and configurations. Further, the description content of the above description and each figure can be an independent embodiment even if it is a part thereof, and the embodiment of the present invention is not limited to one embodiment combining the above description and each figure.

Explanation of Reference Numerals

[0042] 10 Motor-driven reciprocating device 30 Mounting plate 31 Mounting plate body part 37, 39 End faces 60 Motor 70 Rotating shaft 71 Spiral groove L Rotating shaft line direction 80 Moving body 110 Bearing member 121 Bearing hole 130 Conductive member 131 Elastic member 133 Ball

Claims

1. A motor, a rotatable shaft having helical grooves and being electrically conductive and rotationally driven by the motor, a moving body engaged with the helical grooves of the rotatable shaft and reciprocating in the axial direction of the rotatable shaft as the rotatable shaft rotates, an electrically conductive mounting plate that supports one end of the rotatable shaft on the side connecting the motor and the other end of the rotatable shaft, a synthetic resin bearing member attached to the mounting plate and having a bearing hole into which the other end of the rotatable shaft is inserted and rotatably supported, characterized by comprising: a motor-driven reciprocating movement device further comprising a conducting member that electrically conducts between the other end of the rotatable shaft inserted into the bearing hole of the bearing member and the mounting plate to which the bearing member is attached.

2. The motor-driven reciprocating movement device according to Claim 1, wherein the bearing hole of the bearing member is a through hole, and the conducting member comprises an elastic member having electrical conductivity that is inserted into the bearing hole and elastically bounces while conducting between the other end of the rotatable shaft and the mounting plate.

3. The motor-driven reciprocating movement device according to Claim 2, wherein the conducting member further comprises a ball having electrical conductivity that is installed between the other end of the rotatable shaft and the elastic member and is elastically contacted with the other end of the rotatable shaft.

4. The motor-driven reciprocating movement device according to Claim 1 or 2 or 3, wherein the mounting plate comprises a mounting plate main body portion arranged along the rotatable shaft, and a pair of end face portions formed by bending both end portions of the mounting plate main body portion and installed at opposing positions, characterized by comprising: supporting one end of the rotatable shaft on the side connecting the motor on one of the pair of end face portions, and attaching the bearing member that rotatably supports the other end of the rotatable shaft to the other of the pair of end face portions.

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