Dust collector

1. A dust collector comprising:

a dust collection portion configured to suck dust through a dust collection hose;

a communication portion configured to wirelessly communicate with an electric working machine;

a power plug configured to receive an alternating-current power from an alternating-current power source;

a changeover switch directly electrically coupled to the power plug, wherein the changeover switch is configured to be changed into a first state, a second state, and a third state, wherein the changeover switch in the first state makes the dust collection portion operate interlocking with an operation of the electric working machine, the changeover switch in the second state inhibits the dust collection portion from an interlock operation with the operation of the electric working machine, and the changeover switch in the third state stops an operation of the dust collection portion; and

an interlock operation control portion configured to make the dust collection portion perform the interlock operation with the electric working machine in response to receipt of an interlock command by the communication portion with the changeover switch being in the first state, wherein the interlock command is periodically transmitted from the electric working machine,

wherein the interlock operation control portion includes a storage portion in which identification information is stored, the identification information being specific to the electric working machine with which the dust collection portion is to be made to perform the interlock operation,

wherein the interlock command includes an interlock operation request signal and an identification signal, the interlock operation request signal requesting the interlock operation, and the identification signal indicating the identification information, and

wherein the interlock operation control portion is further configured such that,

the interlock operation control portion makes the dust collection portion perform the interlock operation in response to receipt of the interlock command by the communication portion during operation of the electric working machine, and

the interlock operation control portion stops the interlock operation of the dust collection portion in response to no receipt of the interlock command by the communication portion for a specified period of time or more.

2. The dust collector according to claim 1 ,

wherein the specified period of time is set to be longer than a transmission cycle in which the electric working machine periodically transmits the interlock command.

3. The dust collector according to claim 1 , wherein:

the dust collection portion includes:

a motor; and

a motor driving circuit configured to drive the motor; and

the dust collector includes a transmission path extending from the power plug through the changeover switch to the motor driving circuit.

4. The dust collector according to claim 1 , further comprising a signal isolation circuit coupled to the changeover switch and the interlock operation control portion,

wherein a state of the changeover switch is inputted to the interlock operation control portion via the signal isolation circuit.

5. The dust collector according to claim 4 ,

wherein the signal isolation circuit includes a photocoupler.

6. The dust collector according to claim 1 , further comprising a control power source configured to receive the alternating-current power from the alternating-current power source, the control power source being configured to generate a direct-current voltage,

wherein the changeover switch is coupled to the control power source.

7. The dust collector according to claim 6 ,

wherein the control power source is electrically coupled to the power plug via the changeover switch in the first state or the second state.

8. The dust collector according to claim 7 , wherein the control power source is supplied power via the power plug and the changeover switch independent of the power supplied to the dust collection portion.

9. The dust collector according to claim 6 ,

wherein the control power source includes an isolation transformer.

10. The dust collector according to claim 1 , further comprising a power outlet configured to receive the alternating-current power from the alternating-current power source, the power outlet being configured to supply an alternating-current power to an external device,

wherein the changeover switch is coupled to the power outlet.

11. The dust collector according to claim 10 ,

wherein the power outlet is electrically coupled to the power plug via the changeover switch in the first state or the second state.