JPH061291Y2 - Circular saw cutting machine with restraint release device - Google Patents

Description

[Detailed Description of the Invention] [Field of use of the invention] The present invention relates to a releasing device for releasing a cutting tool from a material to be cut when the cutting edge of the cutting tool bites into the material to be cut during cutting work. It is a thing.

[Background of the invention]

Conventionally, when the cutting edge of the cutting tool bites into the material to be cut during cutting work, the power of the electric motor is immediately shut off, and then an impact force is applied to the cutting tool by artificial means to bite into the material to be cut. I was releasing the cutting tool.

Therefore, the cutting workability is remarkably deteriorated, an expensive cutting tool is damaged, and further, the processing accuracy of the material to be cut is deteriorated.

[Purpose of device]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to easily release the cutting tool from the work material when the cutting tool bites into the work material and is in a restrained state.

[Outline of device]

The present invention, when the cutting tool bites into the material to be cut and is in a restrained state, if the cutting tool is rotated in the opposite direction to the cutting direction,
Focusing on the fact that the cutting tool can be released more easily than the material to be cut, a rotation direction changeover switch for the electric motor that rotates the cutting tool so that the cutting tool rotates in the opposite direction to the cutting direction,
The relationship between the operation switch, the stop switch, and the self-holding circuit that holds the closed circuit of the operation switch is devised.

[Example of device]

 An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a side view of a main body of a circular saw type cutting machine showing an embodiment of the present invention, FIG. 2 is a front view of a switch box section viewed from an arrow A direction, and FIG. FIG. 4 is a circuit diagram of the present invention.

In the figure, a base 1 is located above a supporting member 2, and a fixed vise 4 and a moving vise 5 for holding a material to be cut 3 are provided on the base 1. A hinge 6 is swingably supported by a support shaft 7 on the base 1. The hinge 6 is provided with a reversible motor 8 and a handle 9 for swinging the hinge 6. The reversible electric motor 8 rotates the cutting blade 10 via a transmission means (not shown). The hinge 6 has a stop switch 1
1, a switch box 14 provided with an operation switch 12 and a changeover switch 13 for changing the rotation direction of the cutting blade 10.
Is provided.

The operation switch 12 is provided in the changeover switch 13,
The structure is such that the operation switch 12 cannot be switched in the closed state.

In the above structure, the material to be cut 3 is held between the fixed vise 4 and the moving vise 5 on the base 1. The changeover switch 13 is rotated in the cutting direction (hereinafter referred to as forward rotation), the operation switch 12 is operated, the reversible motor 8 is driven, and the cutting blade 1
Rotate 0 in the direction of arrow B. The handle 9 is lowered in the direction of arrow D to cut the work piece 3.

When the cutting tool 10 bites into the material 3 to be cut during the cutting operation, the stop switch 11 is operated to stop the reversible motor 8 and the changeover switch 13 is rotated in the opposite direction of cutting (hereinafter, reverse rotation). ). Alternatively, when the cutting tool 10 is in the above-described state, the changeover switch 13 is directly operated in the reverse direction to stop the reversible motor 8.

Next, the operation switch 12 is operated to rotate the cutting blade 10 in the direction of the arrow C to release the cutting blade 10 from the state in which the material 3 to be cut is restricted.

The configuration of the present invention will be described below with reference to the circuit diagram of FIG.

In the figure, between the power supply lines R, S, T and the reversible motor 8, a series of forward and reverse rotation is possible, and normally open relay contacts 15a, 16 are provided.
a is connected.

Between the power lines S and T, the forward rotation contact 17, the stop switch contact 18, and the operation switch contact 1 of the changeover switch 13 are provided.
9. A normal rotation relay coil 15 through a normally open relay contact 15a for self-holding and a normally open relay contact 16b as an interlock during reverse rotation in parallel with the operation switch contact 19.
Connected to. Further, between the power lines S and T, the reverse rotation contact 20 of the changeover switch 13 and the operation switch contact 1
9, normally open relay contact 15 as an interlock during forward rotation
It is connected to the reversing relay coil 16 via b.

When performing a cutting operation, the changeover switch 13 is operated in the forward direction to close the forward rotation contact 17, the operation switch 12 is operated, and the operation switch contact 19 is closed, so that the forward rotation relay coil 15 is excited. , The normally open relay contact 15a is closed. At this time, the reverse contact 20 is open.

As a result, the forward rotation relay coil 15 is self-held, the reversible motor 8 is driven, and the cutting blade 10 is rotated in the forward direction to perform the cutting work.

When the cutting tool 10 bites into the material to be cut 3 and is in a restricted state during the cutting work, the stop switch 11 is operated to open the stop switch contact 18 to open the forward rotation relay coil 1
The power of 5 is cut off, the reversible motor 8 is stopped, and the changeover switch 1
3 is operated in the reverse direction to open the forward contact 17 and close the reverse contact 20. Alternatively, when the cutting tool is in the above-described state, the forward changeover switch 13 is directly operated in the reverse direction to open the forward rotation contact 17 and close the reverse rotation contact 20 so that the forward rotation relay coil 15 is opened.
Then, the reversible motor 8 is stopped.

Next, when the operation switch 12 is operated to close the operation switch contact 19, the reverse rotation relay coil 16 is excited, the normally open relay contact 16a is closed, the reversible motor 8 is driven, and the cutting blade 10 is reversed. .

As a result, the cutting blade 10 that bites into the material 3 to be cut can be quickly released from the material 3 to be cut.

Further, the changeover switch 13 is set to the normal rotation, and the operation switch 12
When is operated, the cutting work can be performed again as described above.

[Effect of device]

According to the present invention, a cutting blade that has been bitten into the material to be cut and restrained can be easily reversed and released by providing a motor operation, stop switch, and changeover switch, which damages the expensive cutting blade. Without doing so, the cutting blade can be released from the above state.

Further, it is possible to prevent the processing accuracy of the material to be cut from being lowered, and the cutting workability is improved.

[Brief description of drawings]

FIG. 1 is a side view of a main body of a circular saw type cutting machine showing an embodiment of the present invention, FIG. 2 is a front view of a switch box section viewed from an arrow A direction, and FIG. 3 is a cutting tool as a material to be cut. FIG. 4 is a circuit diagram of the present invention, which is an enlarged view of the tip of a cutting blade showing a state in which it is in a bite restraint state. In the figure, 3 is a material to be cut, 8 is a reversible motor, 9 is a handle, 10 is a cutting tool, 11 is a stop switch, 12 is an operation switch, 13 is a changeover switch, 15 is a forward rotation relay coil, and 16 is a reverse rotation relay. Coil, 15a, 16a are normally open relay contacts, 15b, 16b are normally closed relay contacts, 1
Reference numeral 7 is a forward rotation contact, 18 is a stop switch contact, 19 is an operation switch contact, and 20 is a reverse rotation contact.

Claims (1)

[Scope of utility model registration request] 1. A base and a hinge on the base, which is swingable toward a top surface of the base via a support shaft, and is provided with a cutting blade which is rotatably driven by a reversible electric motor. In a circular saw-type cutting machine having an operation switch for operating and stopping the operation and a stop switch, a self-holding circuit for holding a closed path of the operation switch and a switch for switching the rotation direction of the electric motor when the cutting direction of the electric motor is driven. A switch is provided, and when the electric motor is driven in the cutting direction, the self-holding circuit is activated by operating the operation switch, and the self-holding circuit is deactivated by operating the stop switch and the changeover switch. A circular saw type cutting machine with a restraint state releasing device characterized in that the electric motor is started and stopped only by closing the operation switch when driving in the direction.