Binding machine

1. A binding machine comprising:

a wire feeding unit configured to feed a wire;

a curl guide arranged along a loop feeding path of the wire along which the wire fed in a first direction by the wire feeding unit is wound around an object; and

a binding unit which includes a rotary shaft to twist the wire fed in the first direction by the wire feeding unit and wound on the object,

wherein the wire feeding unit comprises a pair of feeding members and a feeding motor that drives the feeding members, the pair of feeding members having a cylindrical outer surfaces, being arranged such that the outer surfaces face each other with a feeding path of the wire being interposed therebetween, and being configured to rotate in mutually opposite directions so as to feed the wire sandwiched between the outer surfaces,

wherein the binding machine further comprises a control circuit configured to control the wire feeding unit,

wherein the control circuit is configured to control the wire feeding unit to discharge the wire sandwiched by the feeding members from the feeding members in a second direction opposite to the first direction,

wherein the control circuit is configured to control the feeding motor to feed the wire sandwiched by the feeding members in the second direction opposite to the first direction until the wire comes off from the feeding members, and

wherein the control circuit is configured to detect a value of current flowing through the feeding motor, to detect variation in load that is applied to the feeding motor based on the detected value of current flowing through the feeding motor, and to determine that the wire comes off from the feeding members to stop the feeding motor that feeds the wire in the second direction, based on variation in load that is applied to the feeding motor or based on a rotating amount of the feeding motor.

2. The binding machine according to claim 1 , wherein the control circuit is configured to control the feeding motor based on an operation on an operation unit to feed the wire sandwiched by the feeding members in the second direction opposite to the first direction until the wire comes off from the feeding members.

3. The binding machine according to claim 1 , wherein the control circuit is configured to detect a value of current flowing through the feeding motor, to detect variation in load that is applied to the feeding motor based on the detected value of current flowing through the feeding motor, and to rotate the feeding motor in a rotating direction of feeding the wire in the second direction, based on a detected variation in load, or

the control circuit is configured to rotate the feeding motor in a rotating direction of feeding the wire in the second direction, based on a detection result of a sensor whether a rear end of the wire fed in the first direction is detected, the sensor being provided on the feeding path between the wire feeding unit and a magazine for accommodating the wire therein.

4. The binding machine according to claim 1 , wherein the control circuit is configured to rotate the feeding motor in a rotating direction of feeding the wire in the first direction and to sandwich the wire by the feeding members, based on an operation on an operation unit, or

the control circuit is configured to rotate the feeding motor in a rotating direction of feeding the wire in the first direction and to sandwich the wire by the feeding members, based on a detection result of a sensor whether a tip end of the wire fed in the first direction is detected, the sensor being provided on the feeding path between the wire feeding unit and a magazine for accommodating the wire therein.

5. The binding machine according to claim 4 , wherein the control circuit is configured to detect a value of current flowing through the feeding motor, to detect variation in load that is applied to the feeding motor based on the detected value of current flowing through the feeding motor, and to change a rotating speed of the feeding motor that feeds the wire in the first direction, based on variation in load that is applied to the feeding motor.

6. The binding machine according to claim 5 , wherein the control circuit is configured to rotate the feeding motor at a first speed until the wire is sandwiched by the feeding members, and to rotate the feeding motor at a second speed higher than the first speed when the wire is sandwiched by the feeding members, thereby feeding the wire sandwiched by the feeding members in the first direction.

7. The binding machine according to claim 4 , further comprising an indicator that notify a state,

wherein the control circuit is configured to notify an operation mode of loading the wire by the indicator.

8. The binding machine according to claim 1 , further comprising a sensor that detects movement due to rotation of the feeding members,

wherein when the control circuit determines that the sensor that detects movement due to the rotation of the feeding members, the control circuit rotates the feeding motor in a rotating direction in which the wire is fed in the first direction, and sandwiches the wire by the feeding members.

9. The binding machine according to claim 8 , wherein the sensor is a sensor that detects rotation of the feeding motor, and

wherein when the control circuit determines that the sensor detects rotation of the feeding motor, the control circuit rotates the feeding motor in a rotating direction in which the wire is fed in the first direction, and sandwiches the wire by the feeding members.

10. The binding machine according to claim 8 , wherein the control circuit is configured to stop the feeding motor that feeds the wire in the first direction, based on a rotating amount of the feeding motor.

11. The binding machine according to claim 1 , further comprising an indicator that notifies a state,

wherein the control circuit is configured to notify an operation mode of discharging the wire based on the indicator.

12. The binding machine according to claim 1 , wherein the pair of feeding members has one feeding member and the other feeding member, at least the one feeding member being displaceable toward and away from the other feeding member,

wherein the wire feeding unit comprises:

an actuator that displaces at least the one feeding member, and

wherein the control circuit is configured to control the actuator to displace one or both of the one feeding member and the other feeding member away from each other, thereby enabling the wire sandwiched by the one feeding member and the other feeding member to be discharged from between the one feeding member and the other feeding member.

13. The binding machine according to claim 1 , wherein the control circuit is configured to control the feeding motor to feed the wire sandwiched by the feeding members in the second direction opposite to the first direction until the wire separates from the feeding members, based on an operation on an operation unit, and to rotate the feeding motor in a rotating direction in which the wire is fed in the first direction to feed the wire in the first direction when the wire sandwiched by the feeding members is discharged from the feeding members.

14. The binding machine according to claim 13 , wherein the control circuit is configured to stop the feeding motor that feeds the wire in the second direction, based on a rotating amount of the feeding motor.

15. The binding machine according to claim 13 , further comprising a sensor that detects movement due to rotation of the feeding members,

wherein when the control circuit determines that the sensor detects movement due to the rotation of the feeding members, the control circuit rotates the feeding motor in a rotating direction in which the wire is fed in the first direction, thereby feeding the wire in the first direction.

16. The binding machine according to claim 15 , wherein the sensor is a sensor that detects rotation of the feeding motor, and

wherein when the control circuit determines that the sensor detects rotation of the feeding motor, the control circuit rotates the feeding motor in a rotating direction in which the wire is fed in the first direction, thereby feeding the wire in the first direction.

17. The binding machine according to claim 15 , wherein the control circuit is configured to stop the feeding motor that feeds the wire in the first direction, based on a rotating amount of the feeding motor.

18. A binding machine comprising:

a wire feeding unit configured to feed a wire;

a curl guide arranged along a loop feeding path of the wire along which the wire fed in a first direction by the wire feeding unit is wound around an object; and

a binding unit which includes a rotating shaft to twist the wire fed in the first direction by the wire feeding unit and wound on the object,

wherein the wire feeding unit comprises a pair of feeding members and a feeding motor that drives the feeding members, the pair of feeding members having a cylindrical outer surfaces, being arranged such that the outer surfaces face each other with a feeding path of the wire being interposed therebetween, and being configured to rotate in mutually opposite directions so as to feed the wire sandwiched between the outer surfaces,

wherein the binding machine further comprises a control circuit configured to control the wire feeding unit, and a sensor that detects movement due to rotation of the feeding members, and

wherein the control circuit is configured to automatically rotate the feeding motor in a rotating direction in which the wire is fed in the first direction when the sensor detects movement due to the rotation of the feeding members in a state where the feeding motor is non-energized.

19. A binding machine comprising:

a wire feeding unit configured to feed a wire;

a curl guide arranged along a loop feeding path of the wire along which the wire fed in a first direction by the wire feeding unit is wound around an object;

a cutter that cuts the wire wound around the object; and

a binding unit which includes a rotating shaft to twist the wire fed in the first direction by the wire feeding unit and wound on the object,

wherein the wire feeding unit comprises a pair of feeding members and a feeding motor that drives the feeding members, the pair of feeding members each having cylindrical outer surfaces, being arranged such that the outer surfaces face each other with a feeding path of the wire being interposed therebetween, and being configured to rotate in mutually opposite directions so as to feed the wire sandwiched between the outer surfaces,

wherein the cutter is provided on the feeding path between the wire feeding unit and the binding unit and cut the wire to divide the wire into a part on a side near to the binding unit from the cutter and another part on a side near to the feeding unit from the cutter,

wherein the binding machine further comprises a control circuit configured to control the wire feeding unit and the cutter,

wherein the control circuit is configured to control the wire feeding unit to enable the another part of the wire cut by the cutter and sandwiched by the feeding members to be discharged from the feeding members,

wherein the pair of feeding members has one feeding member and the other feeding member, at least the one feeding member being displaceable toward and away from the other feeding member,

wherein the wire feeding unit comprises:

an actuator that displaces at least the one feeding member, and

wherein the control circuit is configured to control the actuator to displace one or both of the one feeding member and the other feeding member away from each other, thereby enabling the wire sandwiched by the one feeding member and the other feeding member to be discharged from between the one feeding member and the other feeding member.