JPH0633117B2 - Electric cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electric cutting machine.

(B) Conventional Technology As shown in FIG. 8, a conventionally known cutting machine has a drive wheel (2) 'rotated by a motor on the front surface of a main body case (1)' containing a motor (not shown) and the like. A cutting blade attached to a handle lever (4) 'which can be pivoted upward about a fulcrum (3)'
(5) 'sandwiches the edge of the can (6)', the drive wheel (2) 'rotates the can (6)' and the cutting blade (5) 'causes the can lid (7)' to rotate.
It is the one that cuts. Then, an edge (10) 'is formed by slanting a cut (8)' (9) 'at the tip of the cutting blade (5)' to improve the biting into the can (6) '. As the shape of this edge, an edge (11) 'formed by one oblique cut as shown in FIG. 9-dotted line shown in JP-B-48-42600 is also known.

When the cutting blade of this conventional example is used in a rechargeable or dry battery type cutting machine, if the battery runs out during cutting, the cutting blade (5) ′
As a result, the inclined cut (8) 'becomes a pulling resistance and a large force is required to pull up the cutting blade (5)'. As a result, a large lever as shown in FIG. 8 is required, which makes it difficult to reduce the size and weight of the cutting machine.

(C) Problems to be solved by the invention In view of the above-mentioned drawbacks, the present invention allows the cutting blade to be pulled up with a small force without requiring a large lever even during cutting, and the cutting blade can be cut. The purpose of the present invention is to provide an electric cutting machine that can be easily inserted into the machine.

(D) Means for Solving the Problems The present invention provides a drive wheel that is provided on the front surface of a main body case containing a motor and is rotated by the motor, and is rotatably provided around the fulcrum above the drive wheel. The edge of the can is sandwiched between the cutting edge with the blade partially formed at the tip, the can is rotated by the drive wheel, and the cutting edge is opened by the cutting edge. It is characterized in that the shape is formed in an arc shape with the fulcrum as the center, and a corner portion on the bite side of the cutting edge is cut out to form an edge at an acute angle.

(E) Operation When the cutting blade is brought into contact with the can lid and the drive wheel is rotated by the above means, the sharp edges formed at the corners on the bite side of the cutting edge facilitate the smooth penetration of the can lid. .
Also, when pulling up the cutting blade during cutting, the cutting edge shape of the cutting blade is formed in an arc shape around the rotation fulcrum, so the cutting edge does not interfere with pulling up Can be raised.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings. The cut-off machine shown in the figure is a handy type charge-type cut-off machine, which includes a mechanism section (11A) for accommodating a motor (8), a reduction gear mechanism (9), etc. (neither shown), a step-down transformer, 11
A body case (11) is composed of a secondary battery and a U-shaped grip portion (11B) that is connected to A) and accommodates a secondary battery (neither is shown).

(12) is a drive wheel (feed tooth) provided on the front surface of the main body case (11) so as to project the power of the secondary battery by pressing the operation push button (13) provided on the top surface of the main body case (11). Is supplied to rotate the motor, and the rotation is reduced and transmitted by the reduction gear mechanism. The operation push button (13) has a holding mechanism in a depressed state.

(14) is detachably fixed to the tip of the rotary shaft (16) protruding from the metal blade support plate (15) above the drive wheel (12) and is a fulcrum.
It is a cutting blade rotatable about (O), and the tip fixing portion (16A) of the rotating shaft (16) is formed in a square shape (any non-circular shape) with a diameter smaller than the other end, and the fixing portion (16A) is formed. ) After the synthetic resin lever (17) is pressed into the square hole (18), the cutting blade
A screw (21) which is formed in the upper part of the square hole (19) and has a shape matching the fixing portion (16A) and which is screwed into the screw hole (20) formed in the fixing portion (16A). At the fixed part (16
It is fixed to A).

The lever (17) has a function of holding the blade support plate (15) so as not to easily fall out of the body case (11) and the cutting blade (14).
It has the function of a spacer that keeps the distance from the front of the body case (11) of the body constant, and a hook piece (17A) is integrally formed in the front edge of the upper edge of the lever (17). (17A)
It is configured to also function as a blade raising lever that hangs a finger on the lever to rotate the lever (17) upward.

The cutting blade (14) has a substantially rectangular shape as shown in FIG. 1 and has a side edge (14A) on the head side (left side in FIG. 3) and a lower side and a side edge (14B) on the tail side (right side in FIG. 3). An arcuate cutting edge (22) is formed between the lower end and the fulcrum, and the lower end corner portion on the head side (corner side corner) is cut out to make an acute bite edge (2).
2A) formed.

Also, since the cutting blade (14) is detachable and has a substantially left-right symmetry, there is a risk that it may be reversed and installed by mistake.
As shown in the figure, for example, a notch (38) (may be a protrusion) is formed by deviating from the center (l) to the left or right, and this notch (38)
It is desirable to form a protrusion (not shown) that fits on the cutting edge fitting surface of the lever (17) to prevent erroneous mounting due to lateral reversal.

Reference numeral (24) is a push button made of synthetic resin for raising the blade, which is provided on the upper surface of the main body case (11), and has a cylindrical portion (24A that slides up and down in a button hole (25) formed on the upper surface of the main body case (11). ) And an actuating portion (24B) integrally formed at the lower end thereof, and a spring retainer (26) formed on the main body case (11) and a spring retainer (2) formed inside itself.
It is always urged upward by a coil spring (28) provided between the coil spring and the coil. (29) is the shaft protruding in the body case (11)
An operating lever rotatably supported by (32), a first engaging portion (29A) projectingly provided so as to abut and engage with the operating portion (24B) when the push button (24) is pushed to the intermediate portion. And a second engaging portion (29B) at the tip end thereof, which abuts and engages with a pin (30) protruding from the support plate (15) when the operating lever (29) is rotated.

The support plate (15) has one end locked in the main body case (11) and the other end locked by the support plate (15) by the coil spring (31), as shown in FIG. When the push button (24) is pushed against the spring (31), the lever (29) is rotated about the shaft (32) in the Y direction by the actuating portion (24B).
The support plate (15) is rotated by the second engaging portion (29B) in the direction opposite to the arrow (X) to the position of the broken line in the figure against the spring (31), and the cutting blade is moved.
(14) is pulled. Then, when the pressing force of the push button (24) is released, the support plate (15) returns to its original position by the spring force of the coil spring (31), and the cutting blade (14) is automatically lowered. At the same time, the push button (24) returns from the position indicated by the alternate long and short dash line to the position indicated by the solid line by the force of the coil spring (28).

(33) is a can support provided on the front of the main body case (11).
Separate 3) from case (11) as appropriate. (34) is a cane holding shaft. Reference numeral (35) is a magnet for adsorbing a can lid attached to an arm (36) which is rotatable in the horizontal direction. (37) is a charging / discharging plug that can be freely retracted.

The operation of the above configuration will be described. The normal cutting blade (14) is at the blade lowering position shown by the solid line in Fig. 3, and in order to perform the cutting operation, first push the push button (24) with the thumb of the right hand to raise the cutting blade (14) to the broken line position in the figure. , Hold the can (23) with the left hand, put its edge on the drive wheel (12), and abut the side surface on the support base (33).
Then, when the pressing force of the push button (24) is released, the cutting blade (14) is lowered and the edge (22A) is brought into contact with the lid (23A). Next, when the push button (13) for driving is pushed with the thumb, the driving switch is turned on, the drive wheels (12) start to rotate, and the can (23) rotates,
The cutting blade (14) is difficult to automatically cover the lid (23A).
A) is cut off. When the lid (23A) has been cut off, the motor (9) is stopped by releasing the push button (13) for operation,
The can (23) is sandwiched between the cutting blade (14) and the drive wheel (12) and will not fall even if it is not held by hand.

In this state, hold the can (23) with your left hand and press the push button (24) to pull up the cutting blade (14) .In this condition, the can (23)
Can be removed.

When the secondary battery is discharged during the above cutting operation, the cutting blade bites as shown in Fig. 1, but the cutting edge of the cutting blade (14) forms an arc around the fulcrum (O). Since it is formed, when the push button (24) is pressed, the cutting edge is the cutting edge (38) of the lid (23A).
The cutting blade (14) can be easily pulled up without being caught in the. If it is difficult to pull up with the push button (24), the lever (17) can be held by hand.
By forming the center of rotation of the cutting blade (14) in the cutting blade (14) itself in this cutting blade (14) pulling up operation,
The distance between the point of action of the cutting blade (14) and the center of rotation (O) can be shortened, and the force required for the pulling up operation by the push button (24) or lever (17) can be reduced. Further, since the edge (22A) having an acute angle is formed, the bite into the can lid (23A) can be carried out very smoothly.

The present invention is not limited to the above embodiment, and various changes such as the shape of the main body case can be made. For example cutting blade (14)
The shape of the edge (22A) may be as shown in FIGS. 6 and 7.

(G) Effect According to the present invention configured as described above, the cutting blade has a simple structure in which it is formed in an arc shape around the cutting edge shape of the cutting blade and the rotation fulcrum. The lever can be lifted, and a large lever is not required, so the weight and size of the cutting machine can be reduced. Further, although the cutting edge is arcuate, the edge is formed at the corner on the biting side, so that the cutting blade can easily be automatically bited into the can lid, which is very effective.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is an enlarged cross-sectional view of an essential part showing a halfway through the cutting, FIG. 2 is an overall perspective view, and FIG.
FIG. 4 is an enlarged front view, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a sectional view of essential parts, and FIGS. 6 and 7 are essential parts of another embodiment of the present invention. 8 is a perspective view of a conventional example, and FIG. 9 is an enlarged cross-sectional view of a main part corresponding to FIG. 1 of the conventional example. (12) …… Drive wheel, (14) …… Cutting blade, (22) …… Blade tip,
(22A) …… Etsu, (23) …… Can.

Claims (1)

[Claims] 1. A drive wheel which is provided on the front surface of a main body case containing a motor and which is rotated by the motor, and which is provided above the drive wheel so as to be rotatable around a fulcrum and partially formed with a blade at its tip. In the case of sandwiching the edge of the can with the cutting blade, rotating the can with the drive wheel and making the cutting blade hard to cover and opening it with the cutting blade, the cutting edge shape of the cutting blade is a circle with the fulcrum as the center. An electric cutting machine characterized in that it is formed in an arc shape, and a corner portion on the bite side of the cutting edge is cut out to form an edge of an acute angle at the corner portion.