JP6081890B2 - Work tools - Google Patents

Description

  The present invention relates to a work tool that rotationally drives a tip tool.

  Japanese Patent Application Laid-Open No. 2012-135842 describes a screw driver that rotationally drives a driver bit. The screw driver is configured to transmit the rotation of the drive gear to the spindle by pushing the roller holding member while the roller rotates during the screw tightening operation.

JP 2012-135842 A

  However, in the screw driver, there is still room for improvement with respect to a technique for holding a roller as a transmission member held by a roller holding member. Therefore, the present invention has been made in view of the above, and provides a technique for reliably transmitting the rotation of the motor to the tip tool in the work tool by rationally holding the transmission member. With the goal.

  The above object is achieved by the invention described in claim 1. According to the preferable form of the work tool which concerns on this invention, the work tool which rotationally drives a front-end tool is comprised. The work tool includes a motor having an output shaft and a rotation transmission mechanism that transmits the rotation of the output shaft to the tip tool. The rotation transmission mechanism has a rotation shaft, is disposed between a driving member rotated by a motor, a driven member to which a tip tool is connected, and the driving member and the driven member, and the rotation of the driving member is applied to the driven member. A transmission member for transmitting and a holding member capable of holding the transmission member. The driven member is configured to be movable between a first position and a second position that is farther from the drive member than the first position in the direction in which the rotation shaft extends. Furthermore, the holding member is configured to hold the transmission member at a predetermined initial position so that the transmission member is separated from at least one of the driving member and the driven member. Further, when the driven member is located at the first position, the transmission member is configured to contact the driving member and the driven member. Then, when the transmission member is in contact with the driving member and the driven member, the driving member is rotated by the motor, so that the transmission member moves relative to the driven member relative to the driven member from the initial position to perform predetermined transmission. It is comprised so that it may be arrange | positioned in a position. Thereby, it is comprised so that rotation of a drive member may be transmitted to a driven member via the transmission member arrange | positioned in a transmission position. The holding member holds the transmission member so as to be separated from at least one component member, in other words, restricts the transmission member from coming into contact with at least one component member. The first position where the driven member is located is typically a position opposite to the tip tool side of the work tool with respect to the direction in which the rotation shaft extends (long axis direction of the tip tool). The second position is typically a position closer to the tip tool than the first position with respect to the direction in which the rotation axis extends (long axis direction of the tip tool). In other words, when the tip tool side is defined as the front of the work tool with respect to the direction in which the rotation axis extends (the long axis direction of the tip tool), the first position is the position behind the work tool, The position 2 is a position in front of the work tool. The form in which the rotation of the drive member is transmitted to the driven member via the transmission member typically includes a form in which the drive member, the transmission member, and the driven member rotate together, but is not limited thereto, and the drive You may be comprised so that the difference of rotation speed may arise between a member and a driven member.

  According to the present invention, the holding member holds the transmission member at a predetermined initial position so that the transmission member is separated from at least one of the driving member and the driven member. In a state where the transmission member is positioned and does not transmit the rotation of the drive member to the driven member, the transmission member is restricted from unintentionally contacting the at least one component member. That is, collision and interference with the one component member of the transmission member are prevented. As a result, when the rotation of the output shaft is transmitted from the driving member to the driven member, the transmission member held at the initial position is reliably moved to the transmission position. Thereby, the rotation of the motor transmitted to the drive member by the transmission member is reliably transmitted to the driven member. The state in which the transmission member does not transmit the rotation of the driving member to the driven member includes a state in which the motor is driven and the driving member is rotating, and a state in which the motor is not driven and the driving member is not rotating. Any state is also preferably included.

  According to the further form of the working tool which concerns on this invention, it has a biasing member which biases a holding member. When the driven member is located at the second position, the holding member biases the transmission member by the biasing force of the biasing member, so that the holding member is separated from at least one of the constituent members. The transmission member is configured to be held at the initial position. That is, the transmission member is fixedly held by the holding member using the biasing force of the biasing member. In addition, it is preferable that a transmission member is clamped with a holding member and another component by urging | biasing force. Further, when the driven member is located at the first position, the driving member is rotated by the motor, so that the urging force against the transmission member is released and the holding of the transmission member by the holding member is released, and the transmission member Is configured to move relative to the driven member around the rotation axis and be arranged at the transmission position.

  According to this aspect, by using the urging force of the urging member, in a state where the driven member is located at the second position and the transmitting member does not transmit the rotation of the driving member to the driven member, the transmitting member It is held away from one of the constituent members, thereby restricting the transmission member from unintentionally contacting the one constituent member. Further, when the driven member is located at the first position, the urging force to the transmission member is released, and the holding of the transmission member by the holding member is released, so that the transmission member is smoothly moved toward the transmission position. . Thereby, the transmission member is reliably moved to the transmission position, and the rotation of the drive member is transmitted to the driven member by the transmission member.

  According to the further form of the working tool which concerns on this invention, the moving part for moving a holding member is provided in the holding member. The driven member is provided with a guide portion that engages with the moving portion and guides the movement of the moving portion. Further, the holding member is configured to be moved in the axial direction by the moving unit when the moving unit is guided by the guide unit and moves in the axial direction of the driven member. When the driven member is located at the first position, the drive member is rotated by the motor while the transmission member is in contact with the drive member and the driven member, so that the transmission member moves toward the transmission position. Accordingly, the holding member is configured to move in the axial direction. When the holding member moves in the axial direction, the urging force against the transmission member is released. Note that the engagement between the moving portion and the guide portion is typically achieved by the engagement between the convex portion of one component and the concave portion of the other component. The moving part may be a convex part or a concave part formed integrally with the holding member. In this case, the guide portion may be a concave portion or a convex portion formed integrally with the driven member. On the other hand, the moving part may be provided as a separate member so that a convex part is formed on the holding member by engaging with a concave part formed on the holding member. On the other hand, the guide portion may be provided as a separate member so that a convex portion is formed on the driven member by engaging with a concave portion formed on the driven member.

  According to this embodiment, the moving part is guided by the guide part, and the holding member is moved in the axial direction against the urging force of the urging member. That is, the holding member is moved by the cooperation of the moving unit and the guide unit. Thereby, the urging | biasing force with respect to a transmission member is cancelled | released with the movement which goes to the transmission position of a transmission member. As a result, the transmission member is smoothly moved toward the transmission position. Therefore, the biasing force on the transmission member is automatically released by positioning the driven member at the first position without the operator specially operating the holding member.

  According to the further form of the work tool which concerns on this invention, when a moving part is further guided by the guide part and moves to the circumferential direction around the axial direction of a driven member, a holding member is made with respect to a driven member by a moving part. It is configured to be relatively moved in the circumferential direction. As the driven member moves from the first position to the second position, the holding member moves relative to the driven member in the circumferential direction, so that the holding member moves the transmission member from the transmission position to the initial position. It is configured to move. In other words, the transmission member is automatically returned from the transmission position to the initial position by the movement of the holding member accompanying the movement of the driven member.

  According to this embodiment, the holding member not only holds the transmission member at the initial position, but also the holding member returns the transmission member from the transmission position to the initial position, so the holding member has two functions according to the position of the transmission member. Have. As a result, the number of parts of the work tool is reduced. In addition, since the holding member moves with the movement of the driven member without any special operation of the holding member by the operator, the holding member is rationally moved in conjunction with the movement of the driven member. The

  According to the further form of the working tool which concerns on this invention, the moving part for moving a holding member is provided in the holding member. Further, the driven member is provided with a guide portion that engages with the moving portion and guides the movement of the moving portion. The moving part is guided by the guide part and moved in the circumferential direction around the axial direction of the driven member, so that the holding member is moved relative to the driven member in the circumferential direction by the moving part. Yes. As the driven member moves from the first position to the second position, the holding member moves relative to the driven member in the circumferential direction, so that the holding member moves the transmission member from the transmission position to the initial position. It is configured to move. In other words, the transmission member is automatically moved from the transmission position to the initial position by the movement of the holding member accompanying the movement of the driven member. The moving part may be a convex part or a concave part formed integrally with the holding member. In this case, the guide portion may be a concave portion or a convex portion formed integrally with the driven member. On the other hand, the moving part may be provided as a separate member so that a convex part is formed on the holding member by engaging with a concave part formed on the holding member. On the other hand, the guide portion may be provided as a separate member so that a convex portion is formed on the driven member by engaging with a concave portion formed on the driven member.

  According to this embodiment, in a state where the driven member is located at the second position and the transmission member does not transmit the rotation of the driving member to the driven member, the holding member is arranged such that the transmission member is separated from at least one of the constituent members. In addition to holding the transmission member at the initial position, the holding member returns the transmission member from the transmission position to the initial position as the driven member moves from the first position to the second position. That is, the holding member has two functions corresponding to the position and movement of the driven member. As a result, the number of parts of the work tool is reduced.

  According to the further form of the work tool concerning the present invention, the outside of the driven member is formed in a substantially polygonal pyramid shape whose cross section decreases toward the opposite side of the tip tool in the work tool, and the inside of the drive member is It is formed in a substantially conical shape whose cross section decreases toward the opposite side. That is, the outer side of the driven member and the inner side of the driving member are typically formed so that the cross-section becomes asymptotically smaller toward the side opposite to the tip tool. The driving member is disposed outside the driven member. Further, when the driven member is located at the second position, the holding member is configured to hold the transmission member such that the transmission member is separated from the driving member. And the transmission member is comprised by the some elongate rolling member arrange | positioned corresponding to the side surface of substantially polygonal pyramid shape. Thereby, the rolling member is arrange | positioned so that the center axis | shaft of the said rolling member may incline with respect to a rotating shaft. The “substantially polygonal pyramid shape” includes not only a polygonal pyramid but also a polygonal column. The “substantially conical shape” includes not only a cone but also a cylinder. Further, each side surface forming the outer side of the polygonal column or the polygonal pyramid may be formed in a curved shape instead of a flat shape. The plurality of rolling members may be arranged corresponding to all the side surfaces forming the polygonal pyramid, or may be arranged corresponding to any one of the side surfaces forming the polygonal pyramid. In addition, when a plurality of rolling members are arranged corresponding to any one of the side surfaces forming a polygonal pyramid, the plurality of rolling members are arranged point-symmetrically around the rotation axis. Is preferred. Note that the rolling member typically includes a roller. This roller preferably includes a cylindrical shape and a conical shape.

  According to this embodiment, since the transmission member is composed of a plurality of rolling members corresponding to the respective side surfaces of the polygonal pyramid, the rotation of the driving member is transmitted to the driven member in a balanced manner by the plurality of rolling members. .

  According to the further form of the working tool which concerns on this invention, a holding member is extended in parallel with the long axis of a rolling member, and the holding which hold | maintains the said rolling member so that a rolling member may space apart from a drive member. Part. Then, when the driven member is located at the first position, the drive member is rotated by the motor while the transmission member is in contact with the drive member and the driven member. Thus, the holding member is configured to move toward the side opposite to the tip tool in the work tool with respect to the axial direction of the driven member. Typically, the holding member moves relative to the driven member in the axial direction. In addition, it is preferable that the long axis of a rolling member is comprised as a rolling shaft of the said rolling member.

  According to this embodiment, the holding portion is arranged to be inclined with respect to the rotation axis in parallel with the long axis of the rolling member. Accordingly, the holding member is moved toward the side opposite to the tip tool, so that the holding of the transmission member by the holding portion is released. In other words, the driven member and the driving member are formed in a weight shape whose cross section becomes smaller toward the side opposite to the tip tool, and the holding portion is disposed along the side surface of the weight shape. When the holding member moves to the opposite side, the holding of the transmission member by the holding portion is automatically released. As a result, the transmission member is smoothly moved toward the transmission position.

  According to the further form of the working tool which concerns on this invention, the initial position is prescribed | regulated corresponding to the center area | region of the side surface of a polygonal pyramid regarding the circumferential direction. Therefore, when the transmission member is located in a region having a predetermined width with respect to the center of the side surface of the polygonal pyramid in the circumferential direction, the transmission member does not transmit the rotation of the drive member to the driven member.

  According to the further form of the working tool which concerns on this invention, the front-end tool is comprised as a screw fastening tool which can perform a screw fastening operation | work with respect to a workpiece by rotating a screw. Then, when the tip tool held by the driven member is pressed against the screw, the driven member is moved from the second position to the second position in the work tool with respect to the second position with respect to the axial direction of the rotating shaft. Is configured to move to the first position on the opposite side and to approach the drive member. Further, when the driven member is located at the first position, the drive member is rotated by the motor, so that the transmission member is moved relative to the driven member around the rotation axis and arranged at the transmission position. The rotation of the drive member is transmitted to the driven member via the transmission member disposed in

  According to this embodiment, the work tool is configured as a screw tightening tool. Generally, a screw tightening tool presses a tip tool against a screw at the time of screw tightening work. Therefore, the transmission member is moved to the transmission position by moving the driven member holding the tip tool during the screw tightening operation. That is, the transmission member is moved to the transmission position in accordance with a rational work method when using the screw tightening tool. In other words, the rotation of the driving member is transmitted to the driven member by a rational working mode of the working tool.

  According to the further form of the working tool which concerns on this invention, a rotation transmission mechanism has a cam mechanism arrange | positioned between a motor and a drive member. And based on the rotation direction of the output shaft of a motor, the cam mechanism is comprised so that the position regarding the axial direction of the rotating shaft of a drive member may be switched.

  According to this embodiment, since the position of the drive member when the output shaft of the motor rotates in the forward direction differs from the position of the drive member when the tip tool is pressed, the transmission member comes into contact with the drive member and the driven member. The movement amount of the driving member and / or the driven member is different. Therefore, the rotation of the drive member is rationally transmitted to the driven member according to the work mode based on the rotation direction of the output shaft of the motor.

  ADVANTAGE OF THE INVENTION According to this invention, the technique for rationally transmitting rotation of a motor with respect to a tip tool is provided by hold | maintaining a transmission member rationally.

It is sectional drawing which shows the whole structure of the screwdriver which concerns on 1st Embodiment. It is a fragmentary sectional view of a screw driver. It is sectional drawing in the III-III line of FIG. It is a perspective view which shows the 1st gear member of a drive gear. It is a perspective view which shows the 2nd gear member of a drive gear. It is sectional drawing in the VI-VI line of FIG. It is a perspective view which shows a retainer. It is sectional drawing in the VIII-VIII line of FIG. It is a perspective view which shows a spindle. It is sectional drawing in the XX line of FIG. It is an expanded view which shows the relationship between a spindle and a retainer when the screw driver is not driven. It is an expanded view which shows the relationship between the 1st gear member and the 2nd gear member at the time of the non-drive of a screwdriver. It is sectional drawing equivalent to FIG. 6 at the time of a motor drive. FIG. 13 is a development view corresponding to FIG. 12 when the motor is driven. It is sectional drawing equivalent to FIG. 2 at the time of screw fastening operation | work. FIG. 9 is a cross-sectional view corresponding to FIG. 8 during a screw tightening operation. FIG. 12 is a development view corresponding to FIG. 11 during a screw tightening operation. FIG. 7 is a cross-sectional view corresponding to FIG. 6 during a screw removing operation. FIG. 13 is a development view corresponding to FIG. 12 during a screw removing operation. FIG. 9 is a cross-sectional view corresponding to FIG. 8 during a screw removing operation. FIG. 12 is a development view corresponding to FIG. 11 at the time of screw removal work.

  This embodiment will be described with reference to FIGS. As shown in FIG. 1, a screw driver 1100 that performs a screw tightening operation on a workpiece such as a gypsum board is configured as an example of a work tool. The screw driver 1100 is composed mainly of a main body 1101 and a handle 1107.

  The main body 1101 is mainly composed of a main body housing 1103 and a locator 1105. The main body housing 1103 accommodates the motor 1110 and the drive mechanism 1120. The locator 1105 is attached to the tip region of the main body housing 1103. A tool bit 1119 is detachably attached to the drive mechanism 1120 at the distal end region of the main body 1101. The tool bit 1119 protrudes from the locator 1105 and is attached to the locator 1105 so as to be relatively movable in the major axis direction of the tool bit 1119.

  The handle 1107 is connected to the rear end region of the main body 1101. The handle 1107 is provided with a trigger 1107a and a changeover switch 1107b. By operating the trigger 1107a, a current is supplied from the power cord 1109, and the motor 1110 is driven. Further, the rotation direction of the output shaft 1111 of the motor 1110 is switched by operating the changeover switch 1107b. That is, the output shaft 1111 is driven by selecting one of the rotation directions of forward rotation and reverse rotation. The motor 1110 and the output shaft 1111 are implementation configuration examples corresponding to the “motor” and the “output shaft” in the present invention, respectively.

  As shown in FIGS. 2 to 12, the drive mechanism 1120 mainly includes a drive gear 1125, a retainer 1135, a roller 1145, a coil spring 1146, and a spindle 1150. This drive mechanism 1120 is an implementation structural example corresponding to the "rotation transmission mechanism" in this invention.

  As shown in FIGS. 2 and 3, the drive gear 1125 is mainly composed of a support shaft 1126, a first gear member 1127, a second gear member 1130, and a ball 1133. The first gear member 1127 is formed with gear teeth that engage with gear teeth (not shown) of the output shaft 1111, whereby the drive gear 1125 is rotated by the motor 1110.

  As shown in FIG. 4, the first gear member 1127 is formed with a first engagement groove 1128 and a first engagement portion 1129. In FIG. 4, illustration of gear teeth formed on the first gear member 1127 is omitted. As shown in FIG. 2, the first gear member 1127 is fixed to the support shaft 1126 and rotates integrally with the support shaft 1126. The first gear member 1127 and the support shaft 1126 are supported by a bearing 1134 a fixed to the main body housing 1103 and a bearing 1134 b fixed to the spindle 1150.

  As shown in FIG. 5, the second gear member 1130 is formed with a second engagement groove 1131 and a second engagement portion 1132. As shown in FIG. 2, the second gear member 1130 is held by a first gear member 1127 and a support shaft 1126 so as to be rotatable relative to the first gear member 1127 and the support shaft 1126. Further, the second gear member 1131 is supported on the main body housing 1103 by a bearing 1134c. Accordingly, the second gear member 1131 is supported so as to be relatively movable in the axial direction of the support shaft 1126 with respect to the support shaft 1126.

  As shown in FIG. 6, the three balls 1133 are sandwiched between the first engagement groove 1128 and the second engagement groove 1131. When the ball 1133 contacts the first engaging portion 1129 and the second engaging portion 1132, the first gear member 1127 and the second gear member 1130 rotate together. The drive gear 1125 configured as described above is an implementation configuration example corresponding to the “drive member” in the present invention. Further, the support shaft 1126 is an implementation configuration example corresponding to the “rotating shaft” in the present invention.

  As shown in FIG. 7, the retainer 1135 is a substantially cup-shaped member having a base portion 1136 and a side portion 1138. In the base portion 1136, three ball holding grooves 1137 are formed so as to extend in the axial direction of the retainer 1135 (direction in which the side portion 1138 extends). The side portion 1138 is formed so as to protrude from the base portion 1136 with respect to the direction inclined in the axial direction of the retainer 1135. In other words, in the cross section orthogonal to the axial direction of the retainer 1135, the base 1136 is the smallest and the tip of the side 1138 is the largest. Further, with respect to the circumferential direction of the retainer 1135, the six side portions 1138 are formed with a space therebetween. Thereby, a roller holding space 1139 is formed between the adjacent side portions 1138.

  As shown in FIG. 8, the roller 1145 is held in a roller holding space 1139 formed between adjacent side portions 1138. The roller holding space 1139 is formed with side portions 1138 so that the outer side of the roller holding space 1139 is narrower than the inner side in the radial direction of the retainer 1135. The outer side of the roller holding space 1139 is formed to be shorter than the diameter of the roller 1145. That is, the side portion 1138 is formed with a protruding portion 1138 a that protrudes toward the rotor holding space 1139 in the circumferential direction of the retainer 1135. Accordingly, the protruding portion 1138 a of the side portion 1138 restricts the movement of the roller 1145 to the outside in the radial direction of the retainer 1135. In other words, the roller 1145 is held by the retainer 1135 so that the outward movement of the retainer 1135 in the radial direction is restricted by the protruding portion 1138 a and does not contact the second gear member 1130. The protruding portion 1138 a is formed on each side portion 1138. This retainer 1135 is an implementation configuration example corresponding to the “holding member” in the present invention. Moreover, the side part 1138 which has the protrusion part 1138a is the implementation structural example corresponding to the "holding | maintenance part" in this invention.

  As shown in FIG. 9, the spindle 1150 mainly includes a bit holding part 1151, a flange 1152, a rotation transmission part 1153, and a retainer holding part 1154. A tool bit 1119 is detachably attached to the bit holding portion 1151. The flange 1152 is provided so as to protrude in the radial direction of the spindle 1150. The rotation transmitting portion 1153 is formed in a substantially hexagonal pyramid shape, and the retainer holding portion 1154 is formed in a cylindrical shape. The rotation transmitting portion 1153 is formed in a hexagonal pyramid shape whose cross section decreases toward the rear of the screw driver 1100. That is, the rotation transmitting portion 1153 is formed so that the cross section gradually becomes smaller toward the rear of the screw driver 1100. In other words, the rotation transmitting portion 1153 has an asymptotically smaller cross section toward the rear of the screw driver 1100. A support shaft holding portion 1155 that forms a substantially cylindrical space is formed inside the retainer holding portion 1154, and a bearing 1134b is provided in the support shaft holding portion 1155.

  As shown in FIGS. 2 and 3, the spindle 1150 is supported by a bearing 1158 so as to be movable relative to the main body housing 1103 in the long axis direction of the spindle 1150. The rotation transmission unit 1153 and the retainer holding unit 1154 are disposed inside the second gear member 1130 of the drive gear 1125, and the support shaft 1126 is supported by a bearing 1134 b disposed in the support shaft holding unit 1155. Note that the inner side of the second gear member 1130 is formed in a conical shape whose cross section becomes smaller toward the rear of the screw driver 1100 corresponding to the hexagonal weight of the rotation transmitting portion 1153. That is, the inner side of the second gear member 1130 is formed so that the cross section of the space inside the second gear member 1130 gradually becomes smaller toward the rear of the screw driver 1100. In other words, it becomes asymptotically smaller toward the inside of the second gear member 1130 and toward the rear of the screw driver 1100.

  As shown in FIG. 9, a guide groove 1156 is formed in the retainer holding portion 1154. Three guide grooves 1156 are formed corresponding to the three ball holding grooves 1137 formed in the retainer 1135. Each guide groove 1156 is formed in a substantially V shape in a side view of the spindle 1150 by connecting two grooves 1156a and 1156b with a connecting portion 1156c. That is, the guide groove 1156 is formed so that the connecting portion 1156 c is disposed on the bit holding portion 1151 side of the spindle 1150 (the front side of the screw driver 1100).

  As shown in FIGS. 2 and 3, the coil spring 1146 is provided on the outer periphery of the support shaft 1126 in parallel to the axial direction of the support shaft 1126, and one end abuts against a bearing 1134 b in the support shaft holding portion 1155. The other end is in contact with a bearing 1134c provided in front of the second gear member 1130. Accordingly, the coil spring 1146 urges the spindle 1150 toward the front of the screw driver 1100 with respect to the axial direction of the tool bit 1119. When the tool bit 1119 is pressed against the urging force of the coil spring 1146, the spindle 1150 moves in the long axis direction. The flange 1152 abuts against an abutting portion 1159 provided in the main body housing 1103, and the movement of the spindle 1150 forward of the screw driver 1100 is restricted. The spindle 1150 is an implementation configuration example corresponding to the “driven member” in the present invention.

  As shown in FIGS. 2 and 3, the retainer 1135 is disposed corresponding to the retainer holding portion 1154 of the spindle 1150. That is, the side portion 1138 of the retainer 1135 is disposed to be inclined with respect to the major axis direction of the spindle 1150. Further, as shown in FIG. 10, three balls 1157 are arranged to engage with a ball holding groove 1137 formed on the retainer 1135 and a guide groove 1156 formed on the retainer holding portion 1154, respectively. This guide groove 1156 is an implementation structural example corresponding to the "guide part" in this invention. The ball 1157 is an implementation configuration example corresponding to the “moving part” in the present invention.

  As shown in FIGS. 2 and 3, the retainer 1135 is biased by the disc spring 1147. Accordingly, the retainer 1135 is held so as to be movable relative to the spindle 1150 in the major axis direction of the spindle 1150. Further, a roller 1145 is disposed on each side surface forming the hexagonal pyramid of the rotation transmitting portion 1153. That is, the roller 1145 is arranged such that the long axis (rotary axis) of the roller 1145 is inclined with respect to the long axis direction of the spindle 1150. Thus, in a state where the screw driver 1100 is not driven, the roller 1145 is biased by the disc spring 1147 via the retainer 1135 and is sandwiched between the flange 1152 of the spindle 1150 and the retainer 1135. Even when the motor 1110 is driven and the drive gear 1125 is rotated, when the tool bit 1119 is not pressed against the screw, the screw driver 1100 is not driven. Hereinafter, this state is referred to as a rotation transmission cut-off state. This disc spring 1147 is an implementation configuration example corresponding to the “biasing member” in the present invention.

  In the rotation transmission cut-off state, as shown in FIG. 11, the retainer 1135 is biased by the disc spring 1147, so that each ball 1157 is disposed in the connecting portion 1156 c of the guide groove 1156. That is, the ball 1157 is disposed on the tool bit 1119 side in the V-shaped guide groove 1156. As shown in FIG. 9, the connecting portion 1156 c of the guide groove 1156 is disposed at a position corresponding to the central region of each side surface of the rotation transmitting portion 1153 with respect to the circumferential direction of the spindle 1150. As a result, as shown in FIG. 8, each roller 1145 is held by the retainer 1135 in the central region of each side surface of the hexagonal pyramid-shaped rotation transmission portion 1153.

  In the state where the drive gear 1125 is not rotating, that is, in the initial state where the first gear member 1127 and the second gear member 1130 are not relatively moved, the ball 1133 is shown in FIG. 12 by the urging force of the coil spring 1146. Held in position. Accordingly, the drive gear 1125 is held at a position where the first gear member 1127 and the second gear member 1130 are closest to each other. At this time, the distance in the axial direction between the predetermined portions of the first gear member 1127 and the second gear member 1130 is D.

  The screw driver 1100 configured as described above drives the motor 1110 when the trigger 1107a is operated. The drive gear 1125 is rotated by the rotation of the output shaft 1111 of the motor 1110. Then, the rotation of the drive gear 1125 is transmitted to the spindle 1150, whereby the tool bit 1119 held on the spindle 1150 is rotated.

(Screw tightening work)
In the state shown in FIG. 2, when the output shaft 1111 of the motor 1110 rotates in a predetermined direction (hereinafter referred to as a positive direction), the drive gear 1125 is rotated. That is, as shown in FIGS. 13 and 14, when the first gear member 1127 of the drive gear 1125 is rotated in the direction indicated by the arrow A (direction A), the ball 1133 is engaged with the first engagement portion 1129 and the second engagement portion. The second gear member 1130 rotates in the direction A together with the first gear member 1127 by engaging with the joint portion 1132. As shown in FIG. 14, when the ball 1133 is engaged with the first engagement portion 1129 and the second engagement portion 1132, the first gear member 1127 is inclined by the inclination of the first engagement groove 1128 and the second engagement groove 1131. And the second gear member 1130 is held apart from the distance D. At this time, the distance in the axial direction between the predetermined portions of the first gear member 1127 and the second gear member 1130 is D1 longer than D. As a result, the second gear member 1130 is moved in front of the screw driver 1100. At this time, as shown in FIGS. 2 and 8, since the roller 1145 is held by the retainer 1135 so as not to contact the second gear member 1130, the rotation of the drive gear 1125 is transmitted to the spindle 1150. Not. The first engagement portion 1129, the second engagement portion 1132, and the ball 1133 are an implementation configuration example corresponding to the “cam mechanism” in the present invention. Further, the position of the spindle 1150 shown in FIG. 2 (the front position in the screw driver 1100) is an implementation configuration example corresponding to the “second position” in the present invention.

  On the other hand, as shown in FIG. 15, when the tool bit 1119 is pressed against a screw (not shown), the spindle 1150 moves to the rear of the screw driver 1100 against the urging force of the coil spring 1146. As the spindle 1150 moves, the roller 1145 moves rearward and the roller 1145 contacts the rotating second gear member 1130. Accordingly, the roller 1145 is moved in the circumferential direction of the spindle 1150 by the friction between the roller 1145 and the second gear member 1130, and is arranged at the position shown in FIG. The position of the spindle 1150 shown in FIG. 15 (the rear position in the screw driver 1100) is an example of the configuration corresponding to the “first position” in the present invention.

  At this time, the retainer 1135 is pushed by the roller 1145 and rotated in the A direction with respect to the circumferential direction of the spindle 1150. By rotating the retainer 1135, the ball 1157 is guided and moved by the groove 1156b of the guide groove 1156, as shown in FIG. As a result, the retainer 1135 moves to the rear of the screw driver 1100. That is, the retainer 1135 is moved in the axial direction of the spindle 1150 simultaneously with the movement of the roller 1145 in the circumferential direction of the spindle 1150.

  As the retainer 1135 moves rearward, as shown in FIG. 16, the gap G between the side portion 1138 and the rotation transmitting portion 1153 is increased. As a result, the restriction of the movement of the roller 1145 in the outward direction with respect to the radial direction of the spindle 1150 by the side portion 1138 (protruding portion 1138a) of the retainer 1135 is released. That is, since the second gear member 1130 is formed in a conical shape and the rotation transmission portion 1153 is formed in a substantially hexagonal pyramid shape, the retainer 1135 moves rearward, so that the side portion 1138 and the rotation transmission portion 1153 are arranged. The gap G becomes larger. Thereby, the restriction | limiting of the movement of the roller 1145 to the outer direction regarding the radial direction of the spindle 1150 is cancelled | released. The roller 1145 allowed to move is disposed at the position shown in FIG. 16 and is sandwiched between the second gear member 1130 and the rotation transmitting portion 1153. As a result, the rotation of the drive gear 1125 is transmitted to the spindle 1150 by the wedge effect of the roller 1145 sandwiched between the second gear member 1130 and the rotation transmission unit 1153. As a result, the tool bit 1119 held on the spindle 1150 rotates and the screw tightening operation is performed. At this time, the roller 1145 is disposed to be inclined with respect to the axial direction of the spindle 1150 in correspondence with the inclined surfaces formed on the rotation transmitting portion 1153 and the second gear member 1130. This roller 1145 is the implementation structural example corresponding to the "transmission member" and the "rolling member" in this invention. In addition, the position of the roller 1145 shown in FIG. 16, that is, the position sandwiched between the second gear member 1130 and the rotation transmission portion 1153 is an example of an implementation configuration corresponding to the “transmission position” in the present invention.

  When the screwing operation is performed, the screw is screwed into the workpiece. When the front surface of the locator 1105 contacts the workpiece as the screw to be screwed moves, the spindle 1150 holding the tool bit 1119 gradually moves toward the front of the screw driver 1100. As a result, the contact between the roller 1145 and the second gear member 1130 is released, and the rotation transmission of the drive gear 1125 to the spindle 1150 is blocked. As a result, the screw is screwed into the workpiece to a predetermined depth, and the screw tightening operation is completed. The distance between the screw head held by the tool bit 1119 and the front surface of the locator 1105 as a predetermined depth into which the screw is screwed can be changed by the operator.

  When the contact between the roller 1145 and the second gear member 1130 is released, the retainer 1135 is moved to the position shown in FIG. 11 by the biasing force of the disc spring 1147. That is, the ball 1157 is guided by the guide groove 1156 by the urging force of the disc spring 1147, and the ball 1157 is positioned at the connecting portion 1157c. As a result, the roller 1145 is automatically returned to the initial position shown in FIG. 8 and held by the retainer 1135. At this time, the spindle 1150 is disposed at a front position (second position) of the screw driver 1100 as shown in FIG. The position of the roller 1145 from which the nipping by the second gear member 1130 and the rotation transmitting portion 1153 is released, typically the position corresponding to the central region shown in FIG. 8, corresponds to the “initial position” in the present invention. It is an implementation structural example.

(Screw removal work)
During the unscrewing operation for removing the screw screwed into the workpiece, the screw driver 1100 reversely rotates the screw to remove the screw from the workpiece. At this time, in order to drive the tool bit 1119, it is not reasonable that the tool bit 1119 presses the screw in the same manner as the screw tightening operation. Therefore, the screw driver 1100 is set so that the amount of movement of the tool bit 1119 (the amount of movement of the spindle 1150) is smaller in the screw removal operation than in the screw tightening operation.

  Specifically, the changeover switch 1107b is switched so that the output shaft 1111 of the motor 1110 rotates in the direction opposite to the forward direction in the screw tightening operation (hereinafter referred to as the reverse direction). In the state shown in FIG. 2, when the motor 1110 is driven, the drive gear 1125 is rotated. That is, as shown in FIGS. 18 and 19, when the first gear member 1127 of the drive gear 1125 is rotated in the direction indicated by the arrow B (direction B), the ball 1133 is moved to the first engagement portion 1129 and the second engagement portion 1129. The second gear member 1130 rotates in the direction B integrally with the first gear member 1127 by engaging with the engaging portion 1132. As shown in FIG. 19, when the ball 1133 is engaged with the first engagement portion 1129 and the second engagement portion 1132, the first gear member 1127 is inclined by the inclination of the first engagement groove 1128 and the second engagement groove 1131. And the second gear member 1130 are held away from the distance D1 during forward rotation. At this time, the distance in the axial direction of each predetermined portion between the first gear member 1127 and the second gear member 1130 is D2 longer than D1. Accordingly, the second gear member 1130 is moved further forward of the screw driver 1100 than during the screw tightening operation. At this time, as shown in FIGS. 2 and 8, since the roller 1145 is held by the retainer 1135 so as not to contact the second gear member 1130, the rotation of the drive gear 1125 is transmitted to the spindle 1150. Not.

  On the other hand, as shown in FIG. 15, when the tool bit 1119 is pressed against a screw (not shown), the spindle 1150 moves to the rear of the screw driver 1100 against the urging force of the coil spring 1146. As the spindle 1150 moves, the roller 1145 moves rearward and the roller 1145 contacts the rotating second gear member 1130. Accordingly, the roller 1145 is moved in the circumferential direction of the spindle 1150 by the friction between the roller 1145 and the second gear member 1130, and is arranged at the position shown in FIG.

  At this time, the retainer 1135 is pushed by the roller 1145 and rotated in the B direction with respect to the circumferential direction of the spindle 1150. By rotating the retainer 1135, the ball 1157 is guided and moved by the groove 1156a of the guide groove 1156, as shown in FIG. As a result, the retainer 1135 moves to the rear of the screw driver 1100.

  As the retainer 1135 moves rearward, as shown in FIG. 20, the gap G between the side portion 1138 and the rotation transmitting portion 1153 is increased. As a result, the restriction of the movement of the roller 1145 in the outward direction with respect to the radial direction of the spindle 1150 by the side portion 1138 of the retainer 1135 is released. Therefore, the roller 1145 is sandwiched between the second gear member 1130 and the rotation transmission unit 1153. As a result, the rotation of the drive gear 1125 is transmitted to the spindle 1150 by the wedge effect of the roller 1145 sandwiched between the second gear member 1130 and the rotation transmission unit 1153. As a result, the tool bit 1119 held by the spindle 1150 rotates and the screw removal operation is performed.

  According to the above embodiment, the side portion 1138 (projecting portion 1138a) is formed so that the outer region of the roller holding space 1139 is narrower than the diameter of the roller 1145, and the roller 1145 is in contact with the drive gear 1125. In the absence, the side portion 1138 restricts the movement of the roller 1145 outward in the radial direction of the spindle 1150. In other words, the separation of the roller 1145 from the spindle 1150 is restricted. Thus, in a state where the tool bit 1119 is not pressed against the screw, the roller 1145 is held by the retainer 1135 so as not to contact the second gear member 1130. That is, the roller 1145 is held by the retainer 1135 so as to be separated from the second gear member 1130. Therefore, unintentional movement of the roller 1145 from the initial position toward the second gear member 1130 is restricted.

  Further, according to the embodiment, the roller 1145 is biased by the disc spring 1147 via the retainer 1135, and the axial end of the roller 1145 is sandwiched between the flange 1152 and the retainer 1135. Therefore, the roller 1145 is held at an initial position which is the center position of each side surface forming the hexagonal pyramid with respect to the circumferential direction of the substantially hexagonal pyramid-shaped rotation transmission portion 1153. As a result, in a state where the roller 1145 does not transmit the rotation of the drive gear 1125 to the spindle 1150, the roller 1145 is reliably held at the initial position and the contact with the drive gear 1125 is restricted.

  Further, the roller 1145 is moved in contact with the second gear member 1130, whereby the retainer 1135 releases the urging force of the disc spring 1147 against the roller 1145. Therefore, the biasing force acting on the roller 1145 is released by performing the normal operation of pressing the tool bit 1119 against the screw in order for the operator to perform the screw tightening operation. In particular, in the configuration in which the rotation is transmitted by the wedge effect of the roller 1145 sandwiched between the hexagonal pyramid-shaped rotation transmission portion 1153 and the conical second gear member 1130, the roller 1145 is in the transmission position with respect to the initial position. The distance from the center of the rotation transmission unit 1153 is increased. That is, when the roller 1145 moves from the initial position to the transmission position, the roller 1145 moves relative to the spindle 1150 in the circumferential direction of the spindle 1150 and also moves outward in the radial direction of the spindle 1150. Therefore, the retainer 1135 restricts the outward movement of the roller 1145 at the initial position, but it is necessary to cancel the restriction of the movement when moving toward the transmission position. In this embodiment, the guide groove 1156 and the ball 1157 cooperate to move the retainer 1135 to the rear of the screw driver 1100. The rotation transmitting portion 1153 is formed in a substantially hexagonal pyramid shape whose cross section decreases toward the rear of the screw driver 1100, and the second gear member 1130 is formed in a conical shape whose cross section decreases toward the rear of the screw driver 1100. Therefore, when the retainer 1135 moves rearward, the restriction of the movement of the roller 1145 in the outer direction with respect to the radial direction of the spindle 1150 is automatically released according to the processing operation of the operator.

  Further, according to the embodiment, when the contact between the roller 1145 and the second gear member 1130 is released when the screw tightening operation is completed, the retainer 1135 is rotated by the biasing force of the disc spring 1147, and the roller 1145 is moved. It is moved from the transmission position to the initial position. That is, the roller 1145 is returned from the transmission position to the initial position as the spindle 1150 moves in the axial direction when the screw tightening operation is completed. Therefore, the retainer 1135 automatically moves the roller 1145, so that the transmission of the rotation of the drive gear 1125 to the spindle 1150 is reliably interrupted. As a result, the screw tightening operation is accurately completed at a predetermined screwing depth.

  The retainer 1135 has not only a function of holding the roller 1145 at the initial position but also a function of returning the roller 1145 from the transmission position to the initial position. Furthermore, the retainer 1135 has a function of arranging the six rollers 1145 at positions on the circumference in six equal parts. Thereby, the number of parts of the screw driver 1100 is reduced.

  Further, according to the embodiment, by using the roller 1145, the rotation of the output shaft 1111 of the motor 1110 is transmitted to the spindle 1150 due to the wedge effect of the roller 1145 sandwiched between the drive gear 1125 and the spindle 1150.

  In the above embodiment, the inside of the second gear member 1130 of the drive gear 1125 has a cylindrical shape and the outside of the rotation transmission portion 1153 of the spindle 1150 has a substantially hexagonal pyramid shape. However, the present invention is not limited to this. For example, the inner side of the drive gear may have a substantially hexagonal pyramid shape, and the outer side of the spindle may have a cylindrical shape. Further, the shape is not limited to a substantially hexagonal pyramid shape, and may be a regular polygonal pyramid shape. In this case, it is preferable that the rollers are arranged according to the number of side surfaces of the polygon.

  Further, in the above embodiment, when the screw tightening operation is completed, the contact between the roller 1145 and the second gear member 1130 is released, so that the retainer 1135 is rotated by the biasing force of the disc spring 1147, and the roller 1145 is moved from the transmission position to the initial position, but is not limited thereto. For example, when the screw tightening operation is completed, if the biasing force of the disc spring 1147 exceeds the frictional force between the roller 1145 and the second gear member 1130, the retainer 1135 is rotated by the biasing force of the disc spring 1147. The roller 1145 may be set to be moved from the transmission position to the initial position.

  In the above embodiment, in the rotation transmission cut-off state, the roller 1145 is held by the retainer 1135 so as to abut against the spindle 1150 and not abut against the drive gear 1125. However, the present invention is limited to this. Absent. The roller 1145 may be held so as not to contact the constituent members of both the spindle 1150 and the drive gear 1125. Further, the drive gear 1125 may be held so as not to contact the spindle 1150.

  In the above embodiment, the drive gear 1125 has the first gear member 1127 and the second gear member 1130 connected by the cam mechanism, but is not limited thereto. For example, the first gear member 1127 and the second gear member 1130 may be integrally formed without having a cam mechanism as the drive gear 1125.

  Moreover, in the above embodiment, although demonstrated using the screwdriver 1100 as an example of a working tool, if this invention is applied to working tools, such as a drill and a hammer drill, if it is a working tool which rotates a front-end tool. Good.

In view of the gist of the present invention, the following modes can be configured for the work tool according to the present invention.
(Aspect 1)
The work tool according to claim 1,
A driven member biasing member for biasing the driven member;
The driven member is always urged by the urging force of the driven member urging member and is located at the second position, and is moved against the urging force, thereby being located at the first position. It is comprised so that the working tool characterized by the above-mentioned.
(Aspect 2)
The work tool according to claim 1 or aspect 1,
When the front tool side of the work tool is defined as the front with respect to the direction in which the rotating shaft extends,
The second position is a predetermined position in front of the direction in which the rotation shaft extends,
The work tool characterized in that the first position is a position behind the second position in the direction in which the rotating shaft extends.
(Aspect 3)
The work tool according to claim 2,
The transmission member is configured to be sandwiched between the holding member, the other component member of the driven member, and the driven member at the initial position by the biasing force of the biasing member. Work tool.
(Aspect 4)
The work tool according to aspect 3,
The transmission member is composed of a plurality of elongated rolling members,
The rolling member is configured such that respective end portions in the major axis direction of the rolling member are sandwiched between the holding member and the driven member at the initial position by the biasing force of the biasing member. A work tool characterized by
(Aspect 5)
The work tool according to claim 10,
In the cam mechanism, the position of the drive member based on the rotation direction of the output shaft when performing the screw removal operation is larger than the position of the drive member based on the rotation direction of the output shaft when performing the screw tightening operation. A work tool configured to dispose the drive member at a position close to the tip tool.
(Aspect 6)
The work tool according to claim 9, 10 or aspect 5,
It has a workpiece contact portion that can contact the workpiece during screw tightening work,
With the workpiece contact portion in contact with the workpiece, the tip tool screws the screw into the workpiece, so that the driven member connected to the tip tool moves in the axial direction of the tip tool. The driven member is configured to move from the first position to the second position by moving so as to approach
During the screw tightening operation, the holding member switches the transmission member from the transmission position to the initial position as the driven member moves from the first position to the second position in the axial direction of the tip tool. It is comprised so that the working tool characterized by the above-mentioned.
(Aspect 7)
The work tool according to claim 3 or 5,
The working tool is characterized in that the moving portion is formed as a spherical member that engages with a groove provided in the holding member.
(Aspect 8)
The work tool according to claim 3,
When the driven member is located at the first position,
Simultaneously with the movement of the transmission member from the initial position to the transmission position, the urging force on the transmission member is released by moving the holding member in the axial direction. Work tool to do.
(Aspect 9)
The work tool according to claim 7,
When the driven member is located at the first position,
Simultaneously with the movement of the transmission member from the initial position to the transmission position, the holding member moves toward the side opposite to the tip tool in the work tool with respect to the axial direction of the driven member. A work tool configured to release the holding of the transmission member by a portion.
(Aspect 10)
The work tool according to claim 7,
When the driven member is located at the first position,
Simultaneously with the movement of the transmission member from the initial position to the transmission position, the holding member moves toward the side opposite to the tip tool in the work tool with respect to the axial direction of the driven member. A work tool configured to release an urging force of the urging member with respect to a member.

(Correspondence between each component of this embodiment and each component of the present invention)
The correspondence between each component of the present embodiment and each component of the present invention is shown as follows. In addition, this embodiment shows an example of the form for implementing this invention, and this invention is not limited to the structure of this embodiment.
The screw driver 1100 is an example of a configuration corresponding to the “work tool” of the present invention.
The motor 1110 is an example of a configuration corresponding to the “motor” of the present invention.
The output shaft 1111 is an example of a configuration corresponding to the “output shaft” of the present invention.
The drive mechanism 1120 is an example of a configuration corresponding to the “rotation transmission mechanism” of the present invention.
The drive gear 1125 is an example of a configuration corresponding to the “drive member” of the present invention.
The support shaft 1126 is an example of a configuration corresponding to the “rotary shaft” of the present invention.
The spindle 1150 is an example of a configuration corresponding to the “driven member” of the present invention.
The roller 1145 is an example of a configuration corresponding to the “transmission member” of the present invention.
The roller 1145 is an example of a configuration corresponding to the “rolling member” of the present invention.
The retainer 1135 is an example of a configuration corresponding to the “holding member” of the present invention.
The side portion 1138 is an example of a configuration corresponding to the “holding portion” of the present invention.
The protruding portion 1138a is an example of a configuration corresponding to the “holding portion” of the present invention.
The disc spring 1147 is an example of a configuration corresponding to the “biasing member” of the present invention.
The ball 1157 is an example of a configuration corresponding to the “moving part” of the present invention.
The ball holding groove 1137 is an example of a configuration corresponding to the “moving part” of the present invention.
The guide groove 1156 is an example of a configuration corresponding to the “guide portion” of the present invention.

DESCRIPTION OF SYMBOLS 1100 Screw driver 1101 Main body part 1103 Main body housing 1105 Locator 1107 Handle 1107a Trigger 1107b Changeover switch 1110 Motor 1111 Output shaft 1112 Gear tooth 1119 Tool bit 1120 Drive mechanism 1125 Drive gear 1126 Support shaft 1127 First gear member 1128 First engagement groove 1129 First engaging portion 1130 Second gear member 1131 Second engaging groove 1132 Second engaging portion 1133 Ball 1134 Bearing 1135 Retainer 1136 Base 1137 Ball holding groove 1138 Side 1138a Protruding portion 1139 Roller holding space 1145 Roller 1146 Coil spring 1147 Belleville spring 1150 Spindle 1151 Bit holding part 1152 Flange 1153 Rotation transmission part 1154 Retainer holding part 1155 Support shaft holding portion 1156 Guide groove 1156a Groove 1156b Groove 1156c Connecting portion 1157 Ball 1158 Bearing 1159 Contact portion

Claims (10)

A work tool that rotationally drives the tip tool,
A motor having an output shaft;
A rotation transmission mechanism for transmitting the rotation of the output shaft to a tip tool,
The rotation transmission mechanism is
A drive member having a rotating shaft and rotated by the motor;
A driven member disposed coaxially with the rotating shaft and connected to a tip tool;
A transmission member disposed between the drive member and the driven member for transmitting rotation of the drive member to the driven member;
A holding member capable of holding the transmission member,
The driven member is configured to be movable between a first position and a second position that is farther from the driving member than the first position with respect to a direction in which the rotation shaft extends.
When the driven member is located at the second position, the holding member moves the transmission member to a predetermined initial position so that the transmission member is separated from at least one of the driving member and the driven member. Configured to hold in position,
When the driven member is located at the first position, the transmission member is configured to contact the drive member and the driven member;
When the transmission member is in contact with the drive member and the driven member, the drive member is rotated by the motor, so that the transmission member is rotated around the rotation axis with respect to the driven member from the initial position. It is configured to move relatively and be placed at a predetermined transmission position,
A work tool configured to transmit rotation of the driving member to the driven member via the transmission member disposed at the transmission position. The work tool according to claim 1,
A biasing member that biases the holding member;
When the driven member is located at the second position,
The holding member biases the transmission member by the biasing force of the biasing member, so that the holding member holds the transmission member in the initial position so that the transmission member is separated from the at least one component member. Is configured to
When the driven member is located at the first position,
When the transmission member is in contact with the drive member and the driven member, the drive member is rotated by the motor, so that the urging force to the transmission member is released and the holding member is held by the holding member. The work tool is configured such that the transmission member is moved relative to the driven member around the rotation axis and arranged at the transmission position. The work tool according to claim 2,
The holding member is provided with a moving part for moving the holding member,
The driven member is provided with a guide portion that engages with the moving portion and guides the movement of the moving portion,
The holding member is configured to be moved in the axial direction by the moving portion by the moving portion being guided by the guide portion and moving in the axial direction of the driven member,
When the driven member is positioned at the first position, the drive member is rotated by the motor while the transmission member is in contact with the drive member and the driven member. The holding member is configured to move in the axial direction along with the movement toward the transmission position.
A work tool configured to release an urging force with respect to the transmission member when the holding member moves in the axial direction. The work tool according to claim 3,
When the moving portion is further guided by the guide portion and moves in the circumferential direction around the axial direction of the driven member, the holding member is moved relative to the driven member in the circumferential direction by the moving portion. Is configured as
As the driven member moves from the first position to the second position, the holding member moves relative to the driven member in the circumferential direction, so that the holding member moves the transmission member. A work tool configured to move from the transmission position to the initial position. The work tool according to claim 1 or 2,
The holding member is provided with a moving part for moving the holding member,
The driven member is provided with a guide portion that engages with the moving portion and guides the movement of the moving portion,
As the moving part is guided by the guide part and moves in the circumferential direction around the axial direction of the driven member, the holding member is moved relative to the driven member in the circumferential direction by the moving part. Is composed of
As the driven member moves from the first position to the second position, the holding member moves relative to the driven member in the circumferential direction, so that the holding member moves the transmission member. A work tool configured to move from the transmission position to the initial position. The work tool according to any one of claims 1 to 5,
The outside of the driven member is formed in a substantially polygonal pyramid shape whose cross section becomes smaller toward the side opposite to the tip tool in the work tool,
The inside of the drive member is formed in a substantially conical shape whose cross section decreases toward the opposite side,
The drive member is configured to be disposed outside the driven member,
When the driven member is located at the second position, the holding member is configured to hold the transmission member so that the transmission member is separated from the drive member;
The transmission member is composed of a plurality of elongated rolling members arranged corresponding to the side surface of the substantially polygonal pyramid shape,
The said rolling member is arrange | positioned so that the center axis | shaft of the said rolling member may incline with respect to the said rotating shaft. The work tool according to claim 6,
The holding member has a holding portion that extends in parallel with the long axis of the rolling member and holds the rolling member such that the rolling member is separated from the drive member;
When the driven member is located at the first position,
With the transmission member being in contact with the drive member and the driven member, the holding member is moved along with the movement of the transmission member to the transmission position due to the drive member being rotated by the motor. A work tool configured to move toward the opposite side of the tip tool in the work tool with respect to the axial direction of the driven member. The work tool according to claim 6 or 7,
The work tool according to claim 1, wherein the initial position is defined corresponding to a central region of the side surface with respect to the circumferential direction. The work tool according to any one of claims 1 to 8,
The tip tool is configured as a screw tightening tool that can perform screw tightening work on the workpiece by rotating the screw,
When the tip tool held by the driven member is pressed against the screw, the driven member moves from the second position to the second position in the work tool with respect to the axial direction of the rotating shaft. It is configured to move to the first position on the opposite side of the tip tool and to come close to the drive member,
When the driven member is located at the first position, the drive member is rotated by the motor, so that the transmission member moves relative to the driven member around the rotation axis, and thus the transmission position. The work tool is configured such that rotation of the drive member is transmitted to the driven member via the transmission member disposed at the transmission position. The work tool according to claim 9,
The rotation transmission mechanism has a cam mechanism,
A work tool, wherein the cam mechanism is configured to switch a position of the drive member in the axial direction of the rotation shaft based on a rotation direction of the output shaft of the motor.

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