JP3298218B2 - Portable cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable cutting machine for cutting a workpiece such as a full screw bolt, a reinforcing bar, a round bar, or the like at a building construction site or the like. This is an improved version of Japanese Patent Application No. Hei 5-91678 (Japanese Patent Application Laid-Open No. Hei 6-297233). Hereinafter, the portable cutting machine according to the present invention will be described as a bolt cutting machine that cuts a full-thread bolt whose shaft portion is entirely a screw.

[0002]

2. Description of the Related Art In the above-mentioned application, a motor driven by a storage battery rotates a swing member through a plurality of reduction gears and a cam having a cam surface having a fan shape, and a movable member mounted at an end of the swing member. A bolt cutting machine that cuts all screw bolts by the shearing action between the cutting blade and the fixed cutting blade was proposed. The swinging member is constantly urged by a spring so that the swinging member rotates in a direction in which the movable cutting blade moves away from the fixed cutting blade.

[0003]

SUMMARY OF THE INVENTION It has been found that the bolt cutter described above has the following problems. That is, after the end of cutting, the threaded portions of the two cutting blades are bitten by the frictional force on the threaded portions of the all-threaded bolt, and the biasing force of the spring alone rotates the swinging member to move the movable cutting blade from the full-threaded bolt. It cannot be released and cannot perform the next cutting operation. Also, when the capacity of the storage battery is reduced and the rotation of the swinging member is stopped during the cutting and the cutting is stopped, the cutting work may not be continued unless the storage battery is replaced, and the bolt cutting machine is being cut. There is a possibility that it may not be able to be separated from the full screw bolt. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned disadvantages of the prior art, to move a movable cutting blade away from a fixed cutting blade with a simple configuration and a simple operation, thereby improving operability and reliability. Is to provide a machine.

[0004]

The purpose mentioned above Means for Solving the Problems] includes a cam engaging portion provided at a position other than the cam surface of the cam, cam
And a engaging portion engageable as the swing member to swing member engaging portion provided to the engagement of the cam engaging portion and the pivoting member engaging portion with the cams rotating after slicing end yo Ri said movable cutting blade rotates the swinging member in a direction away from the fixed cutting blade, the cutting Applications
After the cutting is stopped in the motor, the reversible motor is rotated
The movable cutting blade is fixed by engagement of the swinging member engaging portion with the movable cutting blade.
By rotating the swinging member away from the cutting blade,
Is achieved.

[0005]

In the bolt cutting machine constructed as described above, when the movable cutting blade bites into the screw bolt after cutting the screw bolt, the capacity of the storage battery decreases, and the rotation of the swing member stops during cutting. Even if you stop cutting
By rotating the cam forward or backward, the cam engaging portion and the swing member engaging portion engage, and the movable cutting blade rotates the swing member in a direction away from the fixed cutting blade. The blade is separated from the screw bolt, so that the next cutting can be easily performed.

[0006]

1 to 10 showing an embodiment of the present invention.
This will be described with reference to FIG. The housing 1 has a storage portion for storing a reduction gear, which will be described later, for reducing the rotation of the motor 3, and a concave portion in which the motor 3 is mounted behind the storage portion, and further stores a storage battery 12 above the concave portion. It has a handle 13 and the like that has an opening for use and houses the switch 9 and the like, and is a split housing.

The rotation of the motor 3 is achieved by a pinion shaft 2 connected to a motor rotation shaft, a planetary gear 5 for reducing the rotation of the pinion shaft 2 and transmitting the rotation to a second pinion shaft 6, and a gear meshing with the second pinion shaft 6. 7, a cam 19 via a gear 8 mounted on the shaft of the gear 7 and a gear 17 meshing with the gear 8.
Is transmitted to The shaft of the pinion shaft 2, the second pinion shaft 6, and the gears 7 and 8 are the housing 1 and a gear cover 2 described later.
9 is supported by a bearing 4 attached to the bearing 9. The gears 7 and 8 are provided vertically upward with respect to the axis of the motor rotation shaft, and the cam 19 is positioned so that its axis substantially matches the axis of the motor rotation shaft. The front end cam surface of the cam 19 is formed substantially in a fan shape, and a pin 18 constituting the cam engaging portion of the present invention is provided on the front surface of the cam 19, that is, at a position other than the cam surface. The roller 20 that contacts the outer periphery of the front end cam surface of the cam 19 is rotatably supported at the lower end of the swing member 23. The swinging member 23 is rotatably attached to a fixed member 28 at a substantially central portion via a bolt 32. A movable cutting blade 21 is mounted on a substantially upper end of the swing member 23 via a screw 22. The fixed member 28 is fixed to a gear cover 29, and the movable cutting blade 2
A fixed cutting blade 15 facing 1 is mounted via a screw 16. The cam 19, the swing member 23, and the like are housed in a gear cover 29 and a cover 31. The swing member 2
A return plate 27 is mounted on the front surface of 3 via a screw 24, and the return plate 27 is rotatably supported by the bolt 32. Return plate 27
An opening is provided around the pin 18 of the cam 19, and a first arm 25 which constitutes the swing member engaging portion of the present invention, which engages with the pin 18, is provided on the right and below the opening in FIG. 2nd arm 2
6 are provided. A spring 30 is provided between the swinging member 23 and the gear cover 29. The spring 30 is arranged such that the swinging member 23 always moves counterclockwise in FIG.
1 is urged to rotate in a direction away from the fixed cutting blade 15.

In order to cut the full screw bolt 33, the rocking member urged by the spring 30 by rotating the motor 3 and rotating the cam 19 via the reduction gears 2, 5, 7, 8, 17. The movable cutting blade 21 is opened by rotating 23 in the counterclockwise direction in FIG. After the movable cutting blade 21 is opened, the rotation of the motor 3 is temporarily stopped (FIG. 2), and the screw portion of the full screw bolt 33 is screw-fitted to the screw portion formed on the fixed cutting blade 15. 3 is rotated again, the cam 19 is rotated clockwise to rotate the swinging member 23 clockwise, and the cutting blades 15 and 21 shear off the full screw bolt 33 (FIGS. 3 and 4). ). End of cutting
After that, the swing member 23 is rotated by the rotation of the cam 19 and the spring 30.
Is rotated counterclockwise, the movable cutting blade 21 is fixedly cut.
Move away from blade 15. After the end of cutting, the screw of the full screw bolt 33
The threaded portions of the two cutting blades 15 and 21 are frictionally
In the case where it is bitten, as shown in FIG.
9 is the first arm 2 of the return plate 27.
5 , the rotation of the motor 3, that is, the rotation of the cam 19 is performed.
Through the pin 18 and the return plate 27,
Swinging member 23 is Ru is forcibly reversed (Figure 5). As a result, the movable cutting blade 21 is separated from the fixed cutting blade 15, and the movable cutting blade 21 is opened by the urging force of the spring 30 (FIG. 2). One cycle is completed by stopping the rotation of the motor 3 after the movable cutting blade 21 is opened. By repeating the above, the sequential cutting of the full screw bolts 33 becomes possible.

When the capacity of the storage battery 12 decreases during cutting and the swinging member 23 does not move while the movable cutting blade 21 bites into the full screw bolt 33, that is, the cutting is stopped.
If (Fig. 6), when operating the switch 9 in the reverse side to reversely rotate the motor 3 in the remaining capacity of the storage battery 12 Ru rotate the cam 19 in a counterclockwise direction, the pin 18 and the return plate 27 of the cam 19 The second arm portion 26 is engaged (FIG. 7), the stopped swing member 23 is reversed, and the movable cutting blade 21 is separated from the fixed cutting blade 15, that is, the full screw bolt 33. That is, the movable cutting blade 21 can be separated from the full screw bolt 33 by a simple operation of simply rotating the motor 3 in the reverse direction.

FIGS. 9 and 10 show the periphery of the switch 9. FIG. 9 shows a state in which the forward / reverse switching lever 40 is operated against the spring 41 and the switch 9 is operated in the reverse direction. FIG. The state in which the reverse switching lever 40 is returned to the normal rotation side by the spring 41 is shown. When the trigger lever 42 shown in FIG. 1 is operated while the forward / reverse switching lever 40 is pushed in the reverse direction as shown in FIG. 9, the motor 3 rotates in the reverse direction. Motor 3
The movable cutting blade 21 is separated from the fixed cutting blade 15 by the reverse rotation of the blade. When the forward / reverse switching lever 40 is released in this state, the forward / reverse switching lever 40 returns to the forward rotation side by the spring 41. Therefore, unless the forward / reverse switching lever 40 is operated, the motor 3
Always rotates in the forward direction, so that there is no danger that a problem such as locking of the motor 3 due to the reverse rotation of the rocking member 23 will occur, and an accident such as breakage of the portable cutting machine body will be prevented. be able to. Further, since the switch 9 is always on the forward rotation side and not on the reverse rotation side, the operation of the switch 9 is facilitated and the operability is improved.

[0011]

As described above, according to the present invention, the movable cutting blade is separated from the material to be cut by reversing the swinging member after the completion of cutting, so that the movable cutting blade bites into the material to be cut. There is no danger that the next cutting operation will not be possible. Also, even when the storage battery capacity is low and the operation is stopped during cutting, the movable cutting blade can be separated from the material to be cut by simply operating the motor in a reverse direction, which may reduce the cutting efficiency. Such effects as disappearance can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a side view showing a state where a cover is removed in FIG. 1;

FIG. 3 is a side view of a main part showing a start of cutting.

FIG. 4 is a side view of an essential part showing the end of cutting.

FIG. 5 is a main part side view showing a state in which the swinging member starts to reversely rotate after cutting is completed.

FIG. 6 is a side view of a main part showing a state where the swing member is stopped in the middle of cutting and a reverse rotation of the swing member is started.

FIG. 7 is an essential part side view showing a state in which the swinging member has started reverse rotation in FIG. 6;

FIG. 8 is a side view of a main part showing a state where the swinging member is reversed in FIG. 7;

FIG. 9 is a side view showing around the switch of FIG. 1 and showing a state where the switch is operated to the reverse rotation side.

FIG. 10 is a side view showing the periphery of the switch of FIG. 1 and showing a state where the switch is operated to the forward rotation side.

[Explanation of symbols]

3 is a motor, 9 is a switch, 12 is a storage battery, 15 is a fixed cutting blade, 18 is a pin, 19 is a cam, 21 is a movable cutting blade,
23 is a swing member, 27 is a return plate, 25, 26
Is an arm of the return plate 27, 28 is a fixing member, 29
Is a gear cover, 30 is a spring, and 33 is a full screw bolt.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-5270 (JP, A) JP-A-3-75928 (JP, U) JP-A-5-12033 (JP, U) Field (Int. Cl. ⁷ , DB name) B23D 29/00 B23D 17/02

Claims (2)

(57) [Claims] And 1. A reversible reversible motor, a plurality of reduction gears for decelerating the rotation of said reversible motor <br/> motor is rotated via the deceleration gear, formed in a fan shape approximately the cam surface Cam and
Oscillated via a roller that contacts the cam surface of the cam,
A swinging member having rollers and a movable cutting blade mounted on both sides of a swing center, and a fixed cutting blade mounted on a fixed member to face the movable cutting blade and cutting the workpiece by a shearing action with the movable cutting blade. A cam engaging portion provided at a position other than the cam surface of the cam, and a rocking member provided on the rocking member so as to be engageable with the cam engaging portion. and a coupling portion, the movable cutting blade Ri by the engagement of the cam engaging portion and the pivoting member engaging portion with the cam rotation after slicing end rotates the swinging member in a direction away from the fixed cutting blade, Reversing the reversible motor after cutting is stopped in the middle of cutting
The movable disconnection is performed by the engagement between the cam engaging portion and the swing member engaging portion.
Rotate the swinging member so that the cutting blade moves away from the fixed cutting blade.
Portable cutting machine, characterized in that the so that. 2. A reversible motor capable of rotating forward and reverse, a plurality of reduction gears for reducing the rotation of the motor, a cam rotated via the reduction gear and having a cam surface formed substantially in a fan shape, The swinging member is oscillated via a roller that comes into contact with the cam surface, and the roller and the movable cutting blade are attached to a fixed member facing the movable cutting blade and the swinging member attached to both sides of the swing center. A portable cutting machine having a fixed cutting blade for cutting a material to be cut by a shearing action of a pin provided at a position other than the cam surface of the cam, and mounted on a front surface of a swinging member, around the pin. And a return plate having at least two arms that can be engaged with the pin after the end of the cut,
I Ri <br/> said movable cutting blade into engagement with the pin and the arm portion due to the cams rotating rotates the swinging member in a direction away from the fixed cutting blade after the slicing end, reversible motor after cutting stopping halfway cut Reverse
The movable cutting blade is fixed by the engagement between the pin and the arm.
Rotate the swinging member away from the constant cutting blade
Portable cutting machine, characterized in that the.