JP2017160757A - Bundling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bundling machine which may be easily used for a user.SOLUTION: A bundling machine comprises: a housing held by a user; a tool which is rotatably supported onto the housing and holds a wire in a releasable manner; a motor which is stored in the housing and rotates the tool; and a contacting part capable of contacting at least one of a plurality of objects in a state where the tool holds the wire. The contacting part is so configured that the contacting part contacting the object is used as a fulcrum of a lever, and when the bundling machine swings relatively to the object, a part holding the wire on the tool is displaced away from the object.SELECTED DRAWING: Figure 8

Description

  The technology disclosed in this specification relates to a binding machine for binding a plurality of objects such as reinforcing bars with wires.

  Patent Document 1 discloses a binding machine. This binding machine is used for binding work in which a plurality of reinforcing bars are bound by wires. This binding machine includes a tool for holding a wire and a motor for rotating the tool. According to this binding machine, the user can twist the wires together with the power of the motor, and can easily perform the binding work.

European Patent Application No. 034569

  In the bundling operation, if the wires are simply twisted together, play may occur between the object and the wire. Therefore, the user eliminates play between the object and the wire by sandwiching the operation of pulling the wire from the object several times while twisting the wires. Such an operation of pulling up the wire is effective for eliminating play, but requires a relatively large force, and therefore is burdensome for the user.

  The present specification discloses a binding machine for binding a plurality of objects by wires. The binding machine includes a housing that is gripped by a user, a tool that is rotatably supported by the housing and that releasably holds a wire, and a motor that is housed in the housing and that rotates the tool. And a contact portion capable of contacting at least one of the plurality of objects in a state where the tool holds the wire. The abutting portion is configured such that a portion for holding the wire of the tool is separated from the object when the binding machine swings with respect to the object, with the abutting portion abutting on the object as a fulcrum of the lever. ing.

  According to the above-described binding machine, the operator holds the tool by swinging the binding machine with respect to the object while the abutting portion is in contact with the object while the wire is twisted together. The pulled wire can be pulled up from the object. At this time, since the binding machine functions as a lever, the operator's force is amplified and applied to the wire, so that the operator can strongly pull up the wire with a relatively small force.

The top view of the binding machine 10. FIG. The side view of the binding machine 10. FIG. Sectional drawing of the binding machine 10. FIG. FIG. 3 is a block diagram showing an electrical configuration of the binding machine 10. The tool 12 is shown open. The tool 12 is shown closed. The tool 12 which twists the wire 202 which binds the reinforcing bar 200 is shown. The tool 12 which pulls up the wire 202 from the reinforcing bar 200 with the contact portion 15a of the lever portion 15 as a fulcrum is shown. A plurality of control modes that can be executed by the motor controller 50 of the binding machine 10 are shown. The flowchart of the normal control mode of the binding machine. The flowchart of the 1st control mode of the binding machine. The flowchart of the 2nd control mode of the binding machine. The flowchart of the 3rd control mode of the binding machine. The top view of the binding machine 110 of another Example. Sectional drawing of the binding machine 110 of another Example. Sectional drawing in the XVI-XVI line | wire in FIG. The block diagram which shows the electrical structure of the binding machine 110. FIG. A plurality of control modes that can be executed by the motor controller 50 of the binding machine 110 are shown. The flowchart of the normal control mode of the binding machine 110. The flowchart of the 1st control mode of the binding machine 110. FIG.

  In some embodiments, the abutment may be provided integrally with the tool. According to such a configuration, the contact portion can be provided in the vicinity of the holding portion where the tool holds the wire. However, in some other embodiments, the abutment may be provided on the housing or other member.

  In some embodiments, the abutment may be configured to rotate with the tool by a motor. According to such a configuration, the relative position of the tool and the contact portion does not change regardless of the rotational position of the tool. Thereby, the operator can easily bring the contact portion into contact with the object while holding the wire with the tool.

  In some embodiments, the tool may have a first jaw and a second jaw that are relatively movable, and may be configured to sandwich a wire between the first and second jaws. In this case, the contact portion can be provided on at least one of the first and second jaws.

  In some embodiments, the binding machine may further include a handle that is swingably supported relative to the housing and that is operated by a user. In this case, the abutting portion can be provided on the first jaw. When the handle is operated by the user, the second jaw swings with respect to the housing, while the first jaw having the contact portion does not swing with respect to the housing. it can. According to such a structure, it can suppress that the reaction force which a contact part receives from a target object is transmitted to a user via a handle.

  In some embodiments, the tool has a first holding surface provided on the first jaw and a second holding surface provided on the second jaw, the first and second holding surfaces. The wire can be sandwiched between the two. In this case, at least one of the first and second jaws may have a lever portion that extends to the contact portion on the opposite side of the first or second holding surface.

  In some embodiments, the insulator may extend along a plane that is angled with respect to the axis of rotation of the tool, eg, a vertical plane.

  In some embodiments, the binding machine may further include a link member that is swingably coupled to the second jaw via a joint. In this case, the distance from the rotation axis of the tool to the tip of the lever portion may be longer than the distance from the rotation axis of the tool to the joint. According to such a structure, it is suppressed that a joint contacts with an external object and receives damage with the lever part extended long.

  In some embodiments, the binding machine may further include a locking mechanism that locks the rotation of the tool. According to such a configuration, when the tool pulls the wire from the object, the tool is stabilized without rotating, so that the usability of the binding machine is improved.

  In some embodiments, the locking mechanism can have an electrical lock that electrically locks the rotation of the motor. In some other embodiments, the locking mechanism may include a mechanical lock that mechanically locks the tool, the motor, or the rotating shaft connected thereto.

  A binding machine 10 according to an embodiment will be described with reference to the drawings. The binding machine 10 is an electric tool for binding a plurality of reinforcing bars 200 with wires 202 (see FIGS. 5 to 8). The reinforcing bar 200 is disposed inside the concrete and constitutes a part of the reinforced concrete. Note that the binding machine 10 is not limited to the plurality of reinforcing bars 200 and can be used to bind a plurality of other objects with the wires 202.

  As shown in FIGS. 1 and 2, the binding machine 10 includes a tool 12, a housing 20, a handle 34, and a battery pack 32. The housing 20 has a generally cylindrical shape and extends along the longitudinal direction from the front end 20a to the rear end 20b. A tool 12 is rotatably attached to the front end 20 a of the housing 20, and a battery interface 30 is provided at the rear end 20 b of the housing 20. The battery interface 30 is configured such that a battery pack 32 is detachable. The battery pack 32 is a power source for the binding machine 10 and includes a plurality of secondary battery cells (for example, lithium ion cells). The binding machine 10 of the present embodiment is a kind of cordless electric tool, but in other embodiments, the binding machine 10 may be a cord-type electric tool.

  The handle 34 is prepared for operating the tool 12. The user can hold the wire 202 with the tool 12 or release the wire 202 from the tool 12 by operating the handle 34. The handle 34 is attached to the housing 20 via a handle pin 34 a and is supported so as to be swingable with respect to the housing 20. The handle 34 is movable between an open position A that is separated from the housing 20 and a closed position B that is close to the housing 20. An intermediate portion of the housing 20 in the front-rear direction is a grip 20c that is held together with the handle 34 by the user. The configuration of the handle 34 is not particularly limited.

  The tool 12 is rotatably supported by the housing 20. The rotation axis X of the tool 12 is parallel to the longitudinal direction of the housing 20. The tool 12 has a first jaw 14 and a second jaw 16. The first jaw 14 and the second jaw 16 are connected to each other by a tool pin 18. The second jaw 16 can swing with respect to the first jaw 14. The tool pin 18 (that is, the swing axis of the second jaw 16) extends perpendicular to the longitudinal direction of the housing 20. The second jaw 16 is connected to the handle 34 and operates as the handle 34 moves. That is, when the handle 34 moves to the open position A, the second jaw 16 moves away from the first jaw 14, and when the handle 34 moves to the closed position B, the second jaw 16 approaches the first jaw 14. To do. The user can open and close the first jaw 14 and the second jaw 16 by manipulating the handle 34, thereby holding and releasing the wire 202.

  The configuration of the tool 12 is not particularly limited, and can be variously changed. The tool 12 may be any tool that can releasably hold the wire 202, and its specific configuration can be variously changed. The tool 12 is not limited to the configuration for holding the wire 202 as in the present embodiment, and may be configured to hook the wire 202 like a hook, a hacker, or a ring. The tool 12 may have one or a plurality of movable parts interlocked with the handle 34 or the actuator, or may not have a movable part.

  The housing 20 is provided with a main switch 22, a gear selector 24, a display unit 26, and a setting switch 28. The main switch 22 is an example of an operation unit operated by a user to rotate and stop the tool 12. The main switch 22 is configured so that a user can perform an on operation and an off operation. The main switch 22 in the present embodiment is a push button type operation unit. The main switch 22 is positioned in front of the grip 20c, and the user can turn on and off the main switch 22 with, for example, the thumb while holding the grip 20c and the handle 34. The main switch 22 is not limited to a push button type operation unit, but may be a trigger type switch or an operation unit having another configuration.

  The gear selector 24 is an example of an operation unit operated by a user in order to switch a gear ratio of a transmission mechanism 42 (see FIG. 3) described later. The gear selector 24 is mechanically connected to the speed change mechanism 42. The user can switch the speed ratio of the speed change mechanism 42 between the first speed ratio and the second speed ratio by operating the gear selector 24. The first gear ratio is greater than the second gear ratio. Therefore, when the speed ratio of the speed change mechanism 42 is changed from the first speed ratio to the second speed ratio, the rotational speed of the tool 12 increases and the torque of the tool 12 decreases. The gear selector 24 in this embodiment is a slide type operation unit. The gear selector 24 is positioned in front of the grip 20c, and the user can operate the gear selector 24 with, for example, a thumb while gripping the grip 20c and the handle 34. The gear selector 24 is not limited to the slide type operation unit, and may be an operation unit having other configurations.

  The display unit 26 displays various information so as to be visible to the user. The display unit 26 can display the rotation speed of the motor 40 (see FIG. 4) set by the setting switch 28 and the control mode of the motor controller 50 (see FIG. 4) similarly selected by the setting switch 28. Although it is an example, the display part 26 in a present Example has three light emitting diodes. The first light emitting diode displays the selected control mode, and the second and third light emitting diodes display the selected rotational speed. Specifically, when the normal control mode is selected, the first light emitting diode is turned off, and when the first control mode is selected, the first light emitting diode is turned on. Further, when the selected rotation speed is low, both the second and third light emitting diodes are turned off, and when the selected rotation speed is medium speed, only the second light emitting diode is turned on and selected. When the rotation speed is high, both the second and third light emitting diodes are lit. The display unit 26 may include a fourth light emitting diode in order to display selection of the second control mode and other control modes. The display unit 26 may be configured to further display the charge level of the battery pack 32 or other information. The display unit 26 may include a liquid crystal display panel or other display device instead of or in addition to one or a plurality of light emitting diodes.

  The setting switch 28 is located in the vicinity of the rear end 20 b of the housing 20. The setting switch 28 is an example of an operation unit operated by a user in order to give a command to the motor controller 50. For example, the motor controller 50 can change the target value of the rotational speed of the motor 40 in multiple stages (for example, between low speed, medium speed, and high speed). The user can change the target value of the rotation speed of the motor 40 by operating the setting switch 28. Specifically, each time the user presses the setting switch 28, the target value of the rotational speed of the motor 40 is changed in order from low speed, medium speed, and high speed. In addition, the motor controller 50 can selectively execute a plurality of control modes. The user can select a control mode to be executed by the motor controller 50 by operating the setting switch 28. Specifically, when the user presses the setting switch 28 for a long time, the control mode executed by the motor controller 50 is changed. The setting switch 28 in this embodiment is a push button type operation unit. However, the main switch 22 is not limited to a push button type operation unit, and may be an operation unit having other configurations.

  The setting switch 28 is also an operation unit operated by the user in order to change the control parameter in each control mode. The control parameter changed by the setting switch 28 is different in each control mode. The plurality of control modes and the respective control parameters will be described in detail later.

  Next, the internal structure of the housing 20 will be described. As shown in FIG. 3, the binding machine 10 includes a motor 40, a speed change mechanism 42 connected to the motor 40, and a spindle 44 connected to the speed change mechanism 42. The motor 40 is connected to the tool 12 via the speed change mechanism 42 and the spindle 44, and can drive the tool 12 to rotate. The rotation axis of the motor 40 is parallel to the rotation axis X of the tool 12 and extends along the front-rear direction of the housing 20. The motor 40 and the speed change mechanism 42 are disposed in an intermediate portion of the housing 20, that is, in the grip 20c. The grip 20c is strongly held by the user together with the handle 34. Accordingly, the portion that becomes the grip 20c of the housing 20 is required to have relatively high rigidity. In this regard, if the motor 40 and the speed change mechanism 42 are disposed inside the grip 20c, the grip 20c is supported from the inside by the motor 40 and the speed change mechanism 42, whereby the rigidity of the grip 20c can be increased. The motor 40 in the present embodiment is a brushless DC motor. However, the motor 40 is not limited to a brushless DC motor, and may be a DC motor having a brush or another type of motor.

  Torque output from the motor 40 is transmitted to the speed change mechanism 42. The speed change mechanism 42 of this embodiment is a kind of speed reduction mechanism that amplifies the torque from the motor 40. However, the speed change mechanism 42 may be a speed increasing mechanism that increases the rotational speed from the motor 40. Although not particularly limited, the transmission mechanism 42 in the present embodiment is a variable ratio transmission mechanism. The speed change mechanism 42 can switch the speed ratio (that is, the torque amplification factor) between the first speed ratio and the second speed ratio in accordance with the operation of the gear selector 24 by the user. The transmission ratio in the present specification means a value obtained by dividing the rotational speed input to the transmission mechanism 42 by the rotational speed output from the transmission mechanism 42. For example, if the speed ratio of the speed change mechanism 42 is 10, the spindle 44 makes one rotation when the motor 40 makes ten revolutions. The value of the first gear ratio is larger than the value of the second gear ratio. Therefore, when the user selects the first gear ratio, the torque of the tool 12 increases and the rotational speed of the tool 12 decreases. On the other hand, when the user selects the second gear ratio, the torque of the tool 12 is reduced and the rotational speed of the tool 12 is increased. One of the first speed ratio and the second speed ratio may be “1”. The specific structure of the speed change mechanism 42 is not particularly limited. As an example, the speed change mechanism 42 in the present embodiment has a plurality of planetary gear mechanisms connected in series, and some planetary gear mechanisms can be invalidated according to the operation of the gear selector 24. it can. This type of speed change mechanism is described in, for example, Japanese Patent Application Laid-Open Nos. 2015-168036 and 2006-010831.

  Torque output from the speed change mechanism 42 is transmitted to the spindle 44. The spindle 44 is supported so as to be rotatable with respect to the housing 20. The rotation axis of the spindle 44 is parallel to the rotation axis X of the tool 12 and extends along the longitudinal direction of the housing 20. The rear end of the spindle 44 is connected to the speed change mechanism 42, and the front end of the spindle 44 is connected to the tool 12.

  The binding machine 10 further includes a connection mechanism 46. The connection mechanism 46 connects the handle 34 and the second jaw 16 of the tool 12 to each other. The coupling mechanism 46 transmits the swing of the handle 34 to the second jaw 16 and does not transmit the rotation of the second jaw 16 by the motor 40 to the handle 34. As described above, the handle 34 is configured to be movable between the open position A and the closed position B (see FIG. 1). When the handle 34 moves to the open position A, the second jaw 16 moves away from the first jaw 14 (see FIG. 5), and when the handle 34 moves to the closed position B, the second jaw 16 moves to the first jaw. 14 (see FIG. 6). The coupling mechanism 46 allows the tool 12 to rotate relative to the housing 20 regardless of the position of the handle 34 and the second jaw 16.

  The specific configuration of the coupling mechanism 46 is not particularly limited. As an example, the coupling mechanism 46 in the present embodiment includes a link member 46a connected to the second jaw 16, a slide member 46b connected to the link member 46a, and a spring member 46c that biases the slide member 46b forward. . The link member 46 a, the slide member 46 b, and the spring member 46 c are supported so as to be rotatable with respect to the housing 20 together with the tool 12. The slide member 46 b is supported so as to be slidable along a direction parallel to the rotation axis X of the tool 12. The slide member 46b is engaged with the handle 34 in the sliding direction, and is not engaged with the handle 34 in the rotating direction. When the handle 34 moves to the open position A, the slide member 46b moves forward, whereby the link member 46a swings the second jaw 16 in one direction (clockwise in FIG. 3). When the handle 34 moves to the closed position B, the slide member 46b moves rearward, whereby the link member 46a swings the second jaw 16 in the other direction (counterclockwise in FIG. 3). The spring member 46c biases the slide member 46b forward. That is, the spring member 46c urges the handle 34 toward the open position A.

  Next, the electrical configuration of the binding machine 10 will be described. As shown in FIGS. 3 and 4, the binding machine 10 includes a motor controller 50 that controls the operation of the motor 40. The motor controller 50 is disposed in the vicinity of the battery interface 30. The motor 40 is electrically connected to the battery pack 32 via the motor controller 50 and is driven by electric power from the battery pack 32. The motor controller 50 controls the operation of the motor 40 by controlling the power supplied from the battery pack 32 to the motor 40. The motor controller 50 is connected to the main switch 22, the display unit 26, and the setting switch 28. The main switch 22 and the setting switch 28 output a signal corresponding to the operation by the user to the motor controller 50. The display unit 26 operates in response to a command from the motor controller 50.

  As shown in FIG. 4, the binding machine 10 includes a rotation position sensor 52 that detects the rotation position of the motor 40, a current sensor 54 that detects a current flowing through the motor 40, and a gear sensor 56 that detects the position of the gear selector 24. Prepare. The rotational position sensor 52, the current sensor 54 and the gear sensor 56 are connected to the motor controller 50. The rotational position sensor 52 is a Hall element, for example. The motor controller 50 can detect the rotational position, rotational angle, and rotational speed of the motor 40 based on the output signal of the rotational position sensor 52. The motor controller 50 can detect the torque output by the motor 40 based on the output signal of the current sensor 54. The motor controller 50 can detect whether the speed ratio of the speed change mechanism 42 is the first speed ratio or the second speed ratio in accordance with the output signal of the gear sensor 56.

  Next, the detailed structure and operation of the tool 12 will be described with reference to FIGS. The first jaw 14 of the tool 12 has a first holding surface 14a and a first cutting blade 14b. The second jaw 16 of the tool 12 has a second holding surface 16a and a second cutting blade 16b. The first holding surface 14a and the second holding surface 16a constitute a holding portion that holds the wire 202, and the first cutting blade 14b and the second cutting blade 16b constitute a cutting portion that cuts the wire 202. To do. When the handle 34 is moved to the open position A (see FIG. 1), as shown in FIG. 5, the first jaw 14 and the second jaw 16 are separated from each other. When the handle 34 moves to the closed position B (see FIG. 1), the first jaw 14 and the second jaw 16 approach each other as shown in FIG. Thereby, the tool 12 holds the wire 202 between the first holding surface 14a and the second holding surface 16a, and the end portion 202a of the wire 202 is connected to the first cutting blade 14b and the second cutting blade. It is cut by 16b. By cutting the end portion 202a of the wire 202, the end portion 202a of the wire 202 is prevented from being entangled with the binding machine 10 when the tool 12 is rotated. As another embodiment, the tool 12 may not have a cutting portion (the first cutting blade 14b and the second cutting blade 16b).

  As shown in FIG. 7, when the motor 40 rotates the tool 12, the wire 202 held by the tool 12 is twisted together. As a result, the plurality of reinforcing bars 200 are bound by the wires 202. However, if the wires 202 are simply twisted together, play may occur between the reinforcing bars 200 and the wires 202. In this case, the user needs to stop the rotation of the tool 12 and pull the wire 202 from the reinforcing bar 200 and then rotate the tool 12 again. Regarding such an operation of pulling up the wire 202, the tool 12 in this embodiment is provided with an abutting portion 15a that abuts on the reinforcing bar 200. As shown in FIG. 8, the abutting portion 15 a is provided at a position where the abutting portion 15 a can abut against at least one of the plurality of reinforcing bars 200 while the tool 12 holds the wire 202. Accordingly, the user can swing the binding machine 10 (particularly the tool 12) with respect to the plurality of reinforcing bars 200 by using the contact portion 15a that contacts the reinforcing bars 200 as a fulcrum of the lever. When the binding machine 10 swings with respect to the plurality of reinforcing bars 200, the holding portions (the first holding surface 14 a and the second holding surface 16 a) that hold the wire 202 are separated from the plurality of reinforcing bars 200. As a result, the wire 202 is pulled up from the reinforcing bar 200 and play between the reinforcing bar 200 and the wire 202 is eliminated. The distance from the contact portion 15a to the holding portion (the first holding surface 14a and the second holding surface 16a) of the tool 12 is shorter than the distance from the contact portion 15a to the grip 20c of the housing 20. Therefore, since the whole binding machine 10 functions as a lever, the user can pull up the wire 202 with a relatively small force.

  The specific configuration of the contact portion 15a is not particularly limited. Although it is an example, the contact part 15a of the present Example is provided in the 1st jaw 14 of the tool 12. FIG. The first jaw 14 has a lever portion 15 that is located on the opposite side of the first holding surface 14a and extends to the contact portion 15a. The lever portion 15 is formed integrally with the first jaw 14. The insulator portion 15 extends along a plane (for example, an orthogonal plane) that forms an angle with the rotation axis X of the tool 12. The width dimension of the lever portion 15 is equal to the width dimension of the first jaw 14 (or the width dimension of the first holding surface 14a). However, the width dimension of the lever portion 15 may be narrower or wider than the width dimension of the first jaw 14 (or the width dimension of the first holding surface 14a). Here, the width dimension means a dimension in a direction parallel to the swing axis of the second jaw 16 (longitudinal direction of the tool pin 118). Note that the contact portion 15 a may be provided in the second jaw 16 instead of or in addition to the first jaw 14. However, when the user operates the handle 34, the second jaw 16 swings with respect to the housing 20, while the first jaw 14 does not swing with respect to the housing 20. The lever portion 15 and the contact portion 15a are preferably provided on the first jaw 14 that does not swing relative to the housing 20, rather than the second jaw 16 that swings relative to the housing 20.

  As shown in FIG. 5, a link member 46a is swingably connected to the second jaw 16 via a joint 46d. If the joint 46d is damaged, the movement of the second jaw 16 becomes worse. In this regard, in the binding machine 10 of the present embodiment, the lever portion 15 extending from the first jaw 14 is configured to protect the joint 46d. In particular, the distance L1 from the rotation axis X of the tool 12 to the tip 15b of the lever portion 15 is longer than the distance L2 from the rotation axis X of the tool 12 to the tip of the joint 46d. According to such a structure, it can suppress by the lever part 15 that the joint 46d contacts an external object.

  Next, a plurality of control modes of the motor controller 50 will be described. As shown in FIG. 9, the motor controller 50 selects a plurality of control modes including a normal control mode (S2), a first control mode (S4), a second control mode (S6), and a third control mode (S8). Can be executed automatically. When the user operates the setting switch 28, the control mode executed by the motor controller 50 is changed in the order shown in FIG. The user can select an appropriate control mode according to the size of the wire 202 and other work contents.

  FIG. 10 shows the normal control mode. In the normal control mode, the motor controller 50 starts driving the motor 40 at the timing when the main switch 22 is turned on (YES in S12) (S14). The motor controller 50 stops driving the motor 40 at the timing when the main switch 22 is turned off (YES in S16) (S18). That is, the motor controller 50 drives the motor 40 only while the user is turning on the main switch 22. While driving the motor 40, the motor controller 50 controls the rotational speed of the motor 40 to a constant target value based on the output signal of the rotational position sensor 52. That is, in the normal control mode, the rotational speed of the tool 12 is controlled to be constant. In the normal control mode and each control mode described below, the target value of the rotational speed of the motor 40 can be changed by the setting switch 28.

  FIG. 11 shows the first control mode. In the first control mode, the motor controller 50 starts driving the motor 40 at the timing when the main switch 22 is turned on (YES in S22) (S24). Then, the motor controller 50 stops driving the motor 40 at the timing when the rotation angle of the tool 12 reaches a predetermined angle target value (YES in S26) (S28). That is, in the first control mode, when the user turns on the main switch 22, the drive of the motor 40 is automatically stopped after the tool 12 rotates by the angle target value. Although it is an example, the motor controller 50 determines the timing for stopping the driving of the motor 40 based on the output signal of the rotational position sensor 52. That is, the motor controller 50 detects the rotation angle of the motor 40 based on the output signal of the rotational position sensor 52. Then, when the detected rotation angle of the motor 40 reaches a value corresponding to the angle target value, the driving of the motor 40 is stopped. The motor controller 50 may directly detect the rotation angle of the tool 12 instead of the rotation angle of the motor 40. If the user turns off the main switch 22 while the motor controller 50 is driving the motor, the motor controller 50 stops driving the motor 40 at that time.

  While the first control mode is selected, the user can change the angle target value by operating the setting switch 28. As an example, the motor controller 50 can change the angle target value between 360 degrees and 1080 degrees in accordance with an operation applied to the setting switch 28.

  As described above, in the binding machine 10, the speed ratio of the speed change mechanism 42 can be changed between the first speed ratio and the second speed ratio. Therefore, the motor controller 50 changes the timing at which the drive of the motor 40 is stopped according to the gear ratio selected by the gear selector 24. Specifically, when the first gear ratio is selected, the motor controller 50 stops driving the motor 40 when the detected rotation angle of the motor 40 reaches the first angle value. On the other hand, when the second gear ratio is selected, the motor controller 50 stops driving the motor 40 when the detected rotation angle of the motor 40 reaches the second angle value. Here, a value (quotient) obtained by dividing the first angle value by the first speed ratio is equal to a value (quotient) obtained by dividing the second angle value by the second speed ratio, and they are the above-described tool 12. Is equal to (or corresponds to) the target angle value. Thus, in the second control mode, the driving of the motor 40 is automatically stopped after the tool 12 has rotated by the same angle target value regardless of the gear ratio of the speed change mechanism 42.

  FIG. 12 shows the second control mode. In the second control mode, the motor controller 50 starts driving the motor 40 at the timing when the main switch 22 is turned on (YES in S32) (S34). The motor controller 50 stops driving the motor 40 (S38) at the timing when the torque applied to the tool 12 reaches a predetermined torque target value (YES in S36). That is, in the second control mode, when the user turns on the main switch 22, the driving of the motor 40 is automatically stopped after the torque of the tool 12 reaches the torque target value. Although it is an example, the motor controller 50 determines the timing for stopping the driving of the motor 40 based on the output signal of the current sensor 54. That is, the motor controller 50 detects the torque of the motor 40 based on the output signal of the current sensor 54. Then, when the detected torque of the motor 40 becomes a value corresponding to the above-described torque target value, the driving of the motor 40 is stopped. If the user turns off the main switch 22 while the motor controller 50 is driving the motor, the motor controller 50 stops driving the motor 40 at that time.

  While the second control mode is selected, the user can change the above-described torque target value by operating the setting switch 28. As an example, the motor controller 50 can change the torque target value between 1.0 N · m and 50 N · m according to the operation applied to the setting switch 28.

  Also in the second control mode, the motor controller 50 changes the timing to stop driving the motor 40 according to the gear ratio selected by the gear selector 24. Specifically, when the first gear ratio is selected, the motor controller 50 stops driving the motor 40 when the detected torque of the motor 40 reaches the first torque value. On the other hand, when the second gear ratio is selected, the motor controller 50 stops driving the motor 40 when the detected torque of the motor 40 reaches the second torque value. Here, a value (product) obtained by multiplying the first torque value by the first speed ratio is equal to a value (product) obtained by multiplying the second torque value by the second speed ratio, and these are the above-described tool 12. Is equal to (or corresponds to) the target torque value. Thereby, in the second control mode, the drive of the motor 40 is automatically stopped after the torque of the tool 12 reaches the same torque target value regardless of the gear ratio of the transmission mechanism 42.

  FIG. 13 shows the third control mode. In the third control mode, the motor controller 50 starts driving the motor 40 at the timing when the main switch 22 is turned on (YES in S42) (S44). Then, the motor controller 50 stops driving the motor 40 at a timing when a predetermined target time has elapsed from the timing when the driving of the motor 40 is started (YES in S46) (S48). That is, in the third control mode, when the user turns on the main switch 22, the driving of the motor 40 is automatically stopped after the target time has elapsed from that timing. As an example, the motor controller 50 has a built-in timer, and can measure an elapsed time from the timing at which the driving of the motor 40 is started. If the user turns off the main switch 22 while the motor controller 50 is driving the motor, the motor controller 50 stops driving the motor 40 at that time.

  While the third control mode is selected, the user can change the target time by operating the setting switch 28. As an example, the motor controller 50 can change the target time from 0.5 seconds to 5 seconds in accordance with an operation applied to the setting switch 28.

  In the third control mode, while the motor controller 50 drives the motor 40, the rotational speed of the tool 12 is controlled to a constant speed target value. For this purpose, the motor controller 50 detects the rotational speed of the motor 40 based on the output signal of the rotational position sensor 52. Then, the operation of the motor 40 is controlled so that the detected rotation speed of the motor 40 becomes a value corresponding to the above-described speed target value. At this time, the motor controller 50 may change the target time described above according to the gear ratio selected by the gear selector 24. Specifically, when the first gear ratio is selected, the motor controller 50 sets the target time to the first time value. On the other hand, when the second gear ratio is selected, the motor controller 50 sets the target time to the first time value. Here, the value (quotient) obtained by dividing the first time value by the first speed ratio is equal to the value (quotient) obtained by dividing the second time value by the second speed ratio. Thus, in the third control mode, when the user operates the main switch 22 regardless of the gear ratio of the transmission mechanism 42, the tool 12 rotates by substantially the same angle.

  Alternatively, the motor controller 50 may change the target rotational speed of the motor 40 according to the gear ratio selected by the gear selector 24. Specifically, when the first speed ratio is selected, the motor controller 50 controls the operation of the motor 40 so that the detected rotational speed of the motor 40 becomes the first speed value. On the other hand, when the second gear ratio is selected, the motor controller 50 controls the operation of the motor 40 so that the detected rotation speed of the motor 40 becomes the second speed value. Here, a value (quotient) obtained by dividing the first speed value by the first speed ratio is equal to a value (quotient) obtained by dividing the second speed value by the second speed ratio, and they are the above-described tool 12. Is equal to (or corresponds to) the target speed value. Thus, in the third control mode, the rotational speed of the tool 12 is adjusted to the same speed target value regardless of the speed ratio of the speed change mechanism 42.

  As described above, in the binding machine 10 of this embodiment, the motor controller 50 can selectively execute a plurality of control modes. The plurality of control modes control the motor 40 in different modes with respect to the operation applied to the main switch 22. The binding machine 10 is used for various binding operations in which the size (for example, wire diameter) of the wire 202 used is different. When the size of the wire 202 is different, the torque required to twist the wire 202 and the number of times the wire 202 should be twisted also change. With respect to such various bundling operations, the bundling machine 10 of the present embodiment provides a plurality of control modes, so that the user can selectively use a control mode suitable for the bundling operation.

  In the first, second, and third control modes, the driving of the motor 40 is automatically stopped at a timing when a predetermined condition is satisfied even if the user does not turn off the main switch 22. For example, in the first control mode, the drive of the motor 40 is automatically stopped at the timing when the tool 12 is rotated by the angle target value. In the second control mode, the drive of the motor 40 is automatically stopped at the timing when the torque of the tool 12 reaches the torque target value. In the third control mode, the drive of the motor 40 is automatically stopped at the timing when the tool 12 is driven for the target time. According to these configurations, the user can make the finish uniform when performing a plurality of bundling continuously. Further, since the driving of the motor 40 is automatically stopped, the operation of twisting the wires 202 shown in FIG. 5 and the operation of pulling up the wires 202 shown in FIG. 6 are easily performed alternately. The motor controller 50 may have another control mode in which the driving of the motor 40 is stopped when a predetermined condition is satisfied instead of or in addition to the first, second and third control modes.

  As described above, in the binding machine 10 of the present embodiment, the motor controller 50 can change the target value of the rotational speed of the motor 40 in at least two stages. That is, the motor controller 50 selects a low speed control mode in which the target value of the rotational speed is set to the first speed (low speed) and a high speed control mode in which the target value of the rotational speed is set to the second speed (high speed). Can be executed automatically. When the low speed control mode is selected, the motor controller 50 drives the motor 40 at the first speed when the main switch 22 is turned on. When the high speed control mode is selected, the motor controller 50 drives the motor 40 at the second speed when the main switch 22 is turned on. According to such a configuration, the user can change the rotation speed of the motor 40 according to the content of the bundling work, and can easily perform various bundling work.

  When the user performs an operation of pulling up the wire 202, the rotation of the tool 12 may be locked. When the rotation of the tool 12 is locked, the binding machine 10 is stabilized when the user makes the contact portion 15 a contact the reinforcing bar 200. Therefore, the binding machine 10 can further include a lock mechanism that locks the rotation of the tool 12. For example, the motor controller 50 in the present embodiment can electrically lock the rotation of the motor 40. Therefore, as an example, the motor controller 50 may temporarily lock the rotation of the motor 40 at the timing when the driving of the motor 40 is stopped. As another embodiment, the binding machine 10 may include a mechanical lock mechanism instead of or in addition to the electrical lock by the motor controller 50.

  With reference to FIG. 14 and FIG. 15, the binding machine 110 of another Example is demonstrated. Similarly, the binding machine 110 is a power tool for binding a plurality of reinforcing bars 200 (or other objects) with wires 202. In the following description, about the structure substantially the same as the binding machine 10 mentioned above, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol. As shown in FIG. 14, the binding machine 110 includes a tool 112, a housing 20, a handle 34, and a battery pack 32. The housing 20 is provided with a main switch 22, a gear selector 24, a display unit 26, a setting switch 28, and a battery interface 30. These configurations are the same as or correspond to the above-described binding machine 10 except for the details of the tool 112.

  As shown in FIG. 15, the binding machine 110 includes a motor 40, a speed change mechanism 42, and a spindle 44. The motor 40 is connected to the spindle 44 via the speed change mechanism 42. The spindle 44 is rotatably supported with respect to the housing 20 and is connected to the tool 112. These configurations are substantially the same as or correspond to those of the binding machine 10 described above. However, the motor 40 of the binding machine 110 is not a brushless motor but a DC motor having a brush.

  The tool 112 is rotatably supported by the housing 20. The rotation axis X of the tool 112 is parallel to the longitudinal direction of the housing 20. The tool 112 has a first jaw 114 and a second jaw 116. The first jaw 114 and the second jaw 116 are connected to each other by a tool pin 118. The second jaw 116 can swing with respect to the first jaw 114. The tool pin 118 (that is, the swing axis of the second jaw 116) extends perpendicular to the longitudinal direction of the housing 20. The second jaw 116 is connected to the handle 34 and operates as the handle 34 moves. The user can open and close the first jaw 114 and the second jaw 116 by manipulating the handle 34, thereby holding and releasing the wire 202. About the above point, it is common with the tool 12 of the binding machine 10 shown in FIGS.

  The first jaw 114 has a first holding surface 114a. The second jaw 116 has a second holding surface 116a. The first holding surface 114 a and the second holding surface 116 a constitute a holding unit that holds the wire 202. On the other hand, the tool 112 does not have a cutting part that cuts the wire 202 or a contact part 15a that comes into contact with the reinforcing bar 200. In these respects, the tool 112 and the tool 12 of the binding machine 10 shown in FIGS. Is different.

  As shown in FIG. 16, the binding machine 110 further includes a stopper member 146. The stopper member 146 is swingably supported by a pin 148 fixed to the housing 20. The distal end 146 a of the stopper member 146 is biased toward the outer peripheral surface 44 a of the spindle 44, and is normally in contact with the outer peripheral surface 44 a of the spindle 44. A stopper receiving portion 44 b is provided on the outer peripheral surface 44 a of the spindle 44. The stopper receiving portion 44 b has an asymmetric shape with respect to the rotation direction of the spindle 44. Accordingly, when the spindle 44 (and the motor 40) rotates in the forward direction F, the stopper member 146 does not engage with the stopper receiving portion 44b, but when the spindle 44 (and the motor 40) rotates in the reverse direction R. The stopper member 146 engages with the stopper receiving portion 44b. When the stopper member 146 engages with the stopper receiving portion 44b, the rotation of the spindle 44 is prohibited. The rotational position of the tool 112 at this time is referred to as an initial rotational position. In the binding machine 110, when the motor 40 rotates the spindle 44 in the reverse direction R, the rotation of the spindle 44 is prohibited when the stopper member 146 is engaged with the stopper receiving portion 44b. That is, the rotation of the tool 112 is stopped. At this time, the tool 112 is located at the initial position. 14 and 15 show the binding machine 110 when the tool 112 is in the initial position. When the tool 112 is in the initial position, the swing axis of the second jaw 116 of the tool 112 (ie, the longitudinal direction of the tool pin 118) and the swing axis of the handle 34 (ie, the longitudinal axis of the handle pin 34a) are Are parallel to each other.

  Next, the electrical configuration of the binding machine 110 will be described. As shown in FIG. 17, the binding machine 110 includes a motor controller 50, a rotational position sensor 52, a current sensor 54, and a gear sensor 56. These configurations are the same as those of the binding machine 10 shown in FIG. The binding machine 110 further includes a handle sensor 134. The handle sensor 134 detects whether the handle 34 is in the open position or the closed position. The handle sensor 134 is connected to the motor controller 50, and the detection result by the handle sensor 134 is input to the motor controller 50.

  Next, a plurality of control modes of the motor controller 50 will be described. As shown in FIG. 18, the motor controller 50 of the binding machine 110 can selectively execute a plurality of control modes including a normal control mode (S102) and a first control mode (S104). The user can change the control mode executed by the motor controller 50 by operating the setting switch 28. In any control mode, the motor controller 50 can change the target value of the rotational speed of the motor 40 in a plurality of stages in accordance with the operation applied to the setting switch 28.

  FIG. 19 shows a normal control mode of the binding machine 110. In the normal control mode of the binding machine 110, the motor controller 50 drives the motor 40 when the main switch 22 is turned on (YES in S114) with the handle 34 in the closed position (YES in S112). Start (S116). At this time, the motor controller 50 rotates the motor 40 in the forward direction F. That is, the motor controller 50 rotates the motor 40 in a direction in which the stopper member 146 does not function. The motor controller 50 stops driving the motor 40 at the timing when the main switch 22 is turned off (YES in S118) (S120). That is, also in the normal control mode of the binding machine 110, the motor controller 50 drives the motor 40 in the forward direction F only while the user is turning on the main switch 22.

  Thereafter, when the user operates the handle 34 to the open position (YES in S122), the motor controller 50 rotates the motor 40 in the reverse direction R (S124). When the motor 40 rotates in the reverse direction R, the stopper member 146 prohibits the rotation of the spindle 44 at the timing when the tool 112 moves to the initial rotation position. That is, the rotation of the motor 40 and the tool 112 is stopped. When the rotation of the motor 40 is forcibly prohibited, the value of the current flowing through the motor 40 increases. When the current increase of the current value is detected by the current sensor 54 (YES in S126), the motor controller 50 determines that the tool 112 has returned to the initial rotation position, and stops driving the motor 40 (S128).

  In the normal control mode of the binding machine 110, when the user operates the handle 34 to the open position, a reset operation (S124 to S128) for rotating the tool 112 to the initial rotation position is performed. According to such a configuration, when the user holds the wire 202 with the tool 112, the tool 112 is always located at the initial rotation position. Since the posture of the tool 112 is constant, the user can easily hold the wire 202 with the tool 112.

  FIG. 20 shows the first control mode of the binding machine 110. In the first control mode of the binding machine 110, the motor controller 50 drives the motor 40 when the main switch 22 is turned on (YES in S134) with the handle 34 in the closed position (YES in S132). Is started (S136). At this time, the motor controller 50 rotates the motor 40 in the forward direction F. That is, the motor controller 50 rotates the motor 40 in a direction in which the stopper member 146 does not function. Then, the motor controller 50 stops driving the motor 40 (S140) at the timing when the rotation angle of the tool 12 reaches a predetermined angle target value (YES in S138). That is, even in the first control mode of the binding machine 110, when the user turns on the main switch 22, the driving of the motor 40 is automatically stopped after the tool 12 is rotated by the angle target value.

  Thereafter, when the user operates the handle 34 to the open position (YES in S142), the motor controller 50 rotates the motor 40 in the reverse direction R (S144). When the motor 40 rotates in the reverse direction R, the stopper member 146 prohibits the rotation of the spindle 44 at the timing when the tool 112 moves to the initial rotation position. That is, the rotation of the motor 40 and the tool 112 is stopped. If the current sensor 54 detects this increase in current value (YES in S146), the motor controller 50 determines that the tool 112 has returned to the initial rotation position, and stops driving the motor 40 (S148). That is, also in the first control mode, the reset operation (S144 to S148) is executed as in the normal control mode.

  In the binding machines 10 and 110 disclosed in this specification, the motor controller 50 only needs to be able to execute at least one of the plurality of control modes described above. For example, the motor controller 50 may be capable of executing only one of the first to third control modes. Even with such a configuration, the user can make the finish uniform when performing a plurality of bundling continuously. Further, since the driving of the motor 40 is automatically stopped, the operation of twisting the wires 202 shown in FIG. 5 and the operation of pulling up the wires 202 shown in FIG. 6 are easily performed alternately. Alternatively, the motor controller 50 may be capable of executing one or more of the first to third control modes in addition to the normal control mode.

The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings can achieve a plurality of purposes at the same time, and has technical utility by achieving one of the purposes.

10, 110: Binding machine 12, 112: Tool 14, 114: First jaw 14a, 114a: First holding surface 14b: First cutting blade 15: Insulator part 15a: Abutting part 16, 116: Second Jaws 16a, 116a: second holding surface 16b: second cutting blade 20: housing 20c: grip 22: main switch 24: gear selector 26: display 28: setting switch 30: battery interface 32: battery pack 34: Handle 40: Motor 42: Speed change mechanism 44: Spindle 46: Connection mechanism 46a: Link member 46b: Slide member 46c: Spring member 46d: Joint 50: Motor controller 52: Rotation position sensor 54: Current sensor 56: Gear sensor 134: Handle sensor 146: Stopper member 200: Reinforcing bar 202: Wire

Claims (12)

A binding machine for binding a plurality of objects with wires,
A housing gripped by a user;
A tool rotatably supported relative to the housing and releasably holding the wire;
A motor that is housed in the housing and rotates the tool;
A contact portion capable of contacting at least one of the plurality of objects in a state where the tool holds the wire;
Using the abutting portion that abuts on the object as a fulcrum of the insulator, when the binding machine swings with respect to the object, the portion of the tool that holds the wire is separated from the object.
Binding machine.   The binding machine according to claim 1, wherein the contact portion is provided integrally with the tool.   The binding machine according to claim 1, wherein the contact portion is rotated together with the tool by the motor. The tool has a first jaw and a second jaw that are relatively movable, and is configured to sandwich the wire between the first and second jaws,
The binding device according to any one of claims 1 to 3, wherein the contact portion is provided on at least one of the first and second jaws. A handle that is swingably supported with respect to the housing and is operated by a user,
The abutting portion is provided on the first jaw;
The second jaw swings with respect to the housing when the handle is operated by a user, while the first jaw having the contact portion does not swing with respect to the housing. Item 5. A binding machine according to item 4. The tool has a first holding surface provided on the first jaw and a second holding surface provided on the second jaw, and the tool is interposed between the first and second holding surfaces. Configured to sandwich the wire,
6. The binding machine according to claim 4, wherein at least one of the first and second jaws has a lever portion extending to the contact portion on the opposite side of the first or second holding surface.   The binding machine according to claim 5 or 6, wherein the lever portion extends along a plane that forms an angle with respect to a rotation axis of the tool.   The binding machine according to any one of claims 5 to 7, wherein the lever portion extends along a plane perpendicular to the rotation axis of the tool. A link member pivotably connected to the second jaw via a joint;
The binding machine according to any one of claims 5 to 8, wherein a distance from a rotation axis of the tool to a tip of the lever portion is longer than a distance from the rotation axis of the tool to the joint.   The binding machine according to any one of claims 1 to 9, further comprising a lock mechanism that locks the rotation of the tool.   The binding machine according to claim 10, wherein the lock mechanism has an electrical lock that electrically locks the rotation of the motor. A binding machine for binding a plurality of objects with wires,
A housing gripped by a user;
A tool rotatably supported relative to the housing and releasably holding the wire;
A motor that is housed in the housing and rotates the tool;
A contact portion capable of contacting at least one of the plurality of objects in a state where the tool holds the wire;
Bundling machine equipped with.