JPH068150B2 - 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 Conventionally, an electric cutting machine for vertically moving a cutting blade by operating a push button is known from Japanese Patent Publication No. 51-3257. In this conventional example, a movable body that can be pushed downward by a start push button and is constantly urged upward by a spring body is provided, and the cutting blade is pulled down by the downward movement of this movable body. None, the disengagement is performed by pushing down the engaging piece by pushing the release push button.

According to the configuration of this conventional example, since the cutting blade is configured to be pulled up by the spring body that pulls up the movable body, it is necessary to increase the spring pressure of the spring body to facilitate this pulling up. Then, there is a drawback that the pushing operation for lowering the blade of the start push button becomes heavy. There is a drawback in that it is uncertain to raise the blade to weaken the spring pressure in order to deal with this drawback.
Further, there is a drawback that the mechanism becomes complicated, such as requiring an engaging piece for engaging and holding the blade pulled down state and a release push button for releasing the engaging and holding state.

(C) Problems to be solved by the invention In view of the above-mentioned drawbacks, the present invention provides an electric cutting machine that is easy to pull down the blade, can reliably pull up the blade, and has a simple structure. It is one.

(D) Means for Solving the Problems The present invention relates to a drive wheel that rotates when the rotation of the motor is transmitted to the front side of a body case that houses the motor, and is provided above the drive wheel so as to be movable up and down. In a thing provided with a cutting blade that works to cut out a can lid, the main body case is provided with an interlocking body that interlocks with the cutting blade and a biasing means that biases this interlocking body in a cutting blade pulling down direction, and It is characterized in that a pushing operation body for displacing the interlocking body in the cutting blade lifting direction is provided on the upper surface of the main body case.

(E) Action In order to perform cutting with the above-mentioned means, the blade lifting push-up operation body is pushed against the urging force of the interlocking body urging means to pull up the cutting blade, and the cutting wheel is hung on the drive wheel. An edge is placed, the cutting blade is pulled down by the urging force of the urging means, the edge is sandwiched between the driving wheel and the cutting blade, and the driving wheel is rotated to perform ripping.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings. The cutting machine shown in the figure is a handy rechargeable cutting machine, and the main body case
The drive wheel (can feed tooth) (1) is mounted on the front surface of the (K) so as to be rotatable, and the cutting blade (3) is provided above the drive wheel on the front surface so as to be vertically movable to rotate the can. It is something that opens while letting you go. The cutting machine is mainly composed of a drive wheel drive mechanism (A) for rotationally driving the drive wheel (1) and a cutting blade operation mechanism (B), and the drive wheel drive mechanism (A) is a motor (5). Yotsute Drive Wheel (1)
It includes a mechanical component (A ₁ ) for driving the motor at low speed and an electrical component (A ₂ ) for electrically controlling the motor.

[1] Body case The body case (K) is made of synthetic resin and has screws (6) (7)
(8) Formed in a flat shape (left and right width L ₁ >> front and rear width L ₂ ) from the front case (K ₁ ) and the rear case (K ₂ ) that are detachably combined with each other from the functional point of view. And mainly the mechanical components (A
₍₁ ) A mechanism part (10) for accommodating the same and a substantially U-shaped handle part (12) connected to the mechanism part (10) so as to have a rectangular handle window (11). The front case (K ₁ ) is a _first case corresponding to the mechanical part (10).
Portion ₍₁₁₎ and constructed so as to be divided into the other of the second portion (K _12), the two parts (K ₁₁₎ (K ₁₂₎ second portion with forming the engagement between the projection and the groove at the junction ( The tongue piece (13) protruding so as to overlap the K ₁₂ ) and the first portion (K ₁₁ ) and the first portion (K ₁₁ ) are polymerized and fixed by a screw (not shown).

[2] Drive Wheel Drive Mechanism-Mechanical Components (A ₁ ) Next, the drive wheel drive mechanism (A) will be described. The machine component (A ₁ ) is mainly composed of a DC motor (5) and a reduction gear mechanism (14). The motor (5) has its drive shaft (15) protruding toward the front (right end in FIG. 1) side and the electric terminals (16) and (16) facing toward the rear (left end in FIG. 1) side. The partition wall (17) which is provided vertically to the thickness direction of () (in the direction parallel to the paper surface of FIG. 1) and horizontally, and is erected integrally with the first portion (K ₁₁ ). A drive shaft (15) is attached to (18) so as to penetrate the partition wall (17), and is fixed to the partition wall (17) by a screw (not shown) penetrating the partition wall (17).

The reduction gear mechanism (14) is a mechanism for decelerating and transmitting the rotation of the motor drive shaft (15) to the drive wheel (1) rotatably provided protruding from the front surface of the main body case (K). 15) has a metal worm gear (21) fixed to it, a large diameter synthetic resin gear (22) meshing with it, and a small diameter gear (23) located in front of it, from the first part (K ₁₁ ) inward The first gear (G ₁ ) rotatably supported by the metal shaft (24) protruding from the first gear (G ₁ )
₁ ) has a large diameter gear (25) made of synthetic resin that meshes with the small diameter gear (23) and a metal small diameter gear (26) located behind it, and is protruded inward from the first portion (K ₁₁ ). The second gear (G ₂ ) rotatably supported by the metal shaft (27) and the small-diameter gear (26) of this second gear (G ₂ ) mesh with the first part (K ₁₁ ). It comprises a third gear (G ₃ ) fixed to the rear end of a metal shaft (29) rotatably supported by a protruding bearing sleeve (28). At the front end of the shaft (29), that is, the portion protruding from the front case (K ₁ ), the screw groove (3
1) is formed, and the drive wheel (1) is detachably screwed to this portion. The direction of the screw groove (31) is the direction of rotation of the shaft (29).
(X) and the driving wheel (1) are screwed in opposite directions. The rear ends of the shafts (24) (27) (29) are the bosses of the front case (K ₁ ).
It is supported by a metal support plate (34) fixed by screws (not shown) screwed into (32) and (33).

The gear ratio of the above reduction gear mechanism (14) is set to 268: 1, for example, and the gear ratio of the worm gear (21) and the first gear (G ₁ ) is 33: 1, which is large with a small gear. The following reduction ratio is obtained.

[3] drive wheel drive mechanism - electrical components (A ₂₎ electric components of the drive wheel drive mechanism (A) (A ₂₎ is as shown in Figure 15, the AC utility power outlet for plugging into (not shown) Charge plug (35), step-down transformer (T) connected to this, three secondary ((rechargeable) consisting of Ni-Cd battery connected to the secondary side of this transformer through rectifier diode (D ₁ ) ) Battery (b ₁ ) (b ₂ ) (b ₃ ), operation control switch (S) installed in the energizing circuit of the motor (5), for backflow prevention connected in series to the secondary side of the transformer (T) Diode (D ₃ ), light emitting diode (LED) and resistor (R) that light up when charging, diode (D ₂ ) connected to light up light emitting diode (LED) during operation
Consists of.

Referring to FIG. 3, the charging plug (35) has pivot shafts (3
5a) (35a) projecting base part (35b) made of synthetic resin and two plug blades (35c) (35c) insert-molded into this, and the motor (5) of the rear case (K ₂ ) ) And a handle window (11) close to the gear mechanism (14) so as to be retractable by rotation. Specifically, the motor of the rear case (K ₂ )
A plug accommodating recess (37) is formed in the protruding part (36) partially protruded according to the thickness of (5), and the plug is accommodated in this recess (37).
(35) is housed from the inside of the rear case (K ₂ ) in the bearing grooves (38) (38) formed in the recess (37) so that the shafts (35a) (35a) are fitted. Then, the plug (35) is immersed in the recess (37) and is flush with the protrusion (36) (see FIG. 3) and the plug blade.
(35c) (35c) is configured to be rotatable between a recess (37) and a protruding state (see FIG. 4) in which the rear case (K ₂ ) is vertically projected. is doing. On the other hand, the front case (K
_In the second part (K ₁₂ ) of ₁ ), the terminal block (41) (41) with the fixed contact plates (39) (39) mounted facing the plug (35) faces the rear case (K ₂ ). Bearings installed on the terminal blocks (41) and (41) when they are integrally projected and the charging plug (35) is stored in the recess (37) and the front case (K ₁ ) and the rear case (K ₂ ) are joined. Pivots (35a) (35) in recesses (42) (42)
It is configured to fit a). (43) is a T-shaped leaf spring installed between the terminal blocks (41) and (41) and the support plate (34).
(41) Fit the base (43a) in the recess between (41) and support plate
The terminal block (41) is provided by providing a rearward protruding portion (34a) on (34).
(41) Position the wall and the protrusion (34a) on the left and right,
Place (43a) on the step ribs (44) (44) provided on the terminal blocks (41) (41), place the horizontal part (43b) on the support part (43b) on the support plate (34). (Refer to FIG. 1), the protrusion / depression state caused by the rotation of the charging plug (35) is retained by the elastic deformation of the protrusion (not shown) provided on the base portion (35b). . When the plug blade (35) (35) of the charging plug (35) is protruding, the rear end protruding from the base (35b) of the plug blade (35) (35) is the contact plate
(39) (39) is elastically contacted, plug blades (35c) (35c) and contact plate (39)
(39) is maintained in an electrically connected state and plug blades (35c) (35
c) When immersed, this electrical connection is released.

The transformer (T) is positioned and arranged by the ribs (45) ... at a position close to the motor (5) in the lower storage space (12A) of the handle portion (12). Since this position is close to the charging plug (35), the high voltage wiring can be short. Two of the secondary batteries (b ₂ )
(b ₃ ) is a rib on the rear side of the transformer (T) in the lower storage space (12A)
(46) ... and the rising wall (47) of the front case (K ₁ ) are positioned and arranged, and the remaining one (b ₁ ) is the upper storage space of the handle (12).
The ribs (48) ... And the rising wall (47) of the front case (K ₁ ) are positioned and arranged at the rear end of the (12B). The former two
The (b ₂ ) and (b ₃ ) are in direct contact with each other, and the other one (b ₁ ) is electrically connected using the contact plate (49), and the three are connected in series.

The operation control switch (S) is a rib (51) of the case (K ₁ ).
... and rib (52) ... fixed contact plate (54) and movable contact plate (55) attached to printed circuit board (53) inserted between movable contact plate
It is mainly composed of a first push button (56) for pushing (55). First
The push button (56) is shown in FIG. 6 and the rising wall (47) of the front case (K ₁ )
The formation of a semi-circle grooves (57a) and rear case (K ₂₎ of the standing wall (58) in a semi-circle groove (57 b) and the cylindrical portion of the universal insertion into the hole (57) formed out of the formation (56a) and the movable contact plate (5
Like the first operating part (56b) integrally connected to the pressing part (55a) of 5), the cylindrical part (56a) is connected to the opposite side to the first operating part (56b) at the lower end. It is composed of a second actuating portion (56c) formed by obliquely notching the upper surface of the leading side corner portion to form an inclined surface (50). The tubular portion (56a) has a stepped portion for engaging the peripheral edge (58) of the hole (57) at one end and keeping the movable contact plate (55) in contact with the fixed contact plate (54).
Forming (59).

Various measures have been taken to facilitate the engagement of the stepped portion (59). First cylindrical portion (56a) a pair of which is formed on the front side and the rear side and each front case (K ₁₎ and rear case (K ₂₎ of the lower guide rib (61) (61) (the rear case side is not shown) Guide grooves (62) and (62) (front side not shown) are formed. The guide ribs (61) (61) are extended in the vertical direction, but the upper part (61a) and the lower part (61b) are laterally displaced, that is, the lower part (61b) is the leading part with respect to the upper part (61a). It is formed so as to deviate toward the (right end in FIG. 1) side. This guide rib (6
1) When the push button (56) is pushed due to the eccentric configuration of (61), the push button (56) is displaced to the front side. Next, a coil spring (63d) is formed between the cylindrical spring receiver (56d) formed inside the cylindrical portion (56a) (see FIG. ₁ ) and the disc-shaped spring receiver (63) formed integrally with the front case (K ₁ ). 64) is installed, and the disc-shaped spring receiver is attached to the center of the cylindrical spring receiver (56d).
By displacing the center of (63) toward the beginning, the coil spring
The lower part is offset from the upper part of (64) (see Fig. 1)
Therefore, the push button (56) receives the force of moving in the front direction by the original shape restoring force of the coil spring (64).

Further, the pressing portion (55a) of the movable contact plate (55) is bent downward to form a mountain shape, and the pressing portion (55a) is pressed by the pressing protrusion (65) of the first operating portion (56b). With this structure, when the push button (56) is pressed, the elastic force of the movable contact plate (55) urges the pressing portion (55a) in the leading direction. Further, the rear side of the upper surface of the tubular portion (56a) is formed as a low step portion (65) and an inclined surface (67) is formed between the tubular portion (56a) and the high step portion (66). With this structure, press the thumb with the push button (56).
Pushing the top surface tends to generate force in the front direction.

The diodes (D ₁ ) (D ₂ ) (D ₃ ) and the resistor (R) are attached to the lower surface side of the printed circuit board (53), and the light emitting diode (LED) extends the front side of the printed circuit board (53). Further, the tip end is exposed to the upper surface from the window (68) formed on the upper surface of the first portion (K ₁₁ ) and provided upright on the front surface side of the third gear (G ₃ ).

[4] Cutting Blade Operating Mechanism (B) Next, the structure of the cutting blade operating mechanism (B) will be described. This mechanism (B) is attached to the upper part of the first part (K ₁₁ ) of the body case (K). Referring to FIG. 5, (71) has a rotary shaft (73) which is rotatably supported in a shaft hole (72) formed in the first portion (K ₁₁ ) and is provided in the main body case (K). A metal interlocking plate (interlocking body) that is rotatably mounted, has a cutting blade (3) removably fixed to the tip of a rotating shaft (73), and the cutting blade (3) is a fulcrum (74), that is, a rotating shaft. (73)
It is freely rotatable around its central axis. The rotary shaft (7
The tip fixing part (73a) of 3) has a smaller diameter than other parts and is formed in a square shape (it is good if it is a non-circular shape), and the synthetic resin lever (75) has a square hole (76) in this fixing part (73a). After being press-fitted in
The cutting blade (3) is formed in the upper part thereof and is fitted into the fixing portion (73a) by a square hole (77) having a shape matching the fixing portion (73a), and is screwed into the screw hole (78) formed in the fixing portion (73a) ( It is fixed to the fixed portion (73a) at 79).

The lever (75) is press-fitted to connect the interlocking plate (71) to the main body case.
It has a function of holding it so that it will not easily come off from (K) and a function of a spacer that keeps the distance of the cutting blade (3) from the front of the main body case (K) constant, and A handle piece (75) is integrally formed on the edge in the front, and it also functions as a blade raising lever that rotates the lever (75) upward by putting a finger on the handle piece (75) Has been done. In addition, a claw piece (75
The rear end of a) comes into contact with the upper surface of the arm support base (90) described later to regulate the rotation of the cutting blade (3) in the pulling down direction.

The cutting blade (3) has a substantially rectangular shape shown in FIG. 14 and is a fulcrum (74) between the lower end of the side edge (3A) on the leading side and the lower end of the side edge (3B) on the rear side (right side in the same figure). An arcuate cutting edge (3C) is formed around
The lower end corner (corner side corner) on the leading side is cut out to form an acute-angled comer edge (3D). The interlocking plate (71)
Has one end locked in the main body case (K) and the other end interlocking plate (71)
A coil spring (82) as a biasing means that is locked to the projection (71d) formed in FIG. 5 is biased in the P direction of FIG. 5, that is, in the blade lowering direction.

(83) is a synthetic resin second push button (pushing body) for raising the blade, which is provided on the upper surface of the main body case (K) on the top side of the first push button (56) with reference to FIGS. 6 and 13. Then, the cylindrical part (83a) that slides up and down in the button hole (84) formed on the upper surface of the main body case (K) and the blade operating first operating part (83b) integrally formed at the lower end of the cylindrical part (83a) Spring actuating member (85) formed in the main body case (K) and the spring actuating member (83d) formed inside the self-operated second actuating portion (83c)
(See FIG. 1) A coil spring (86) is provided between the coil spring and the coil spring (86) to constantly urge it upward. The second operating part (83c)
Is located above the slope (50) of the second operating portion (56c) of the first push button (56) (see FIG. 8) locked in the operating state, and the slope (8
7) is formed and the second push button (83) is pushed to shift the first push button (56) in the rearward direction, and the engagement of the push button (56) is released.
The slopes (50) (87) may have either one. (89)
(89) is a pair of guide ribs formed on the front case (K ₁ ) and the rear case (K ₂ ) (the rear case side is not shown), and the tubular portion (83a)
It is fitted in a pair of grooves (91) (91) (front side not shown) formed in front of and behind, and guides the tubular portion (83a) up and down. (92)
Is a synthetic resin actuating lever rotatably supported by a shaft (93) projecting in the main body case (K). The second push button (83) is provided in the middle part.
A first engaging portion (92a) protruding so as to abut and engage the operating portion (83b) when pressed, and a protruding portion on the interlocking plate (71) at the tip end when the operating lever (92) rotates. It has the 2nd engaging part (92b) which abuts and engages with the pin (71a). This actuating lever (92) is
With respect to (93), a release arm portion (92d) is formed on the side opposite to the second engagement portion (92b) so as to face the second operation portion (56c) of the first push button (56). When 56 is lowered, the second actuating portion (56c) pushes the release arm portion (92d) to release the engagement between the engagement groove portion (71b) and the engagement portion (94).

(95) is a U-shaped leaf spring attached to the main body case (K), and when the cutting blade (3) is in the lowered state, the protrusion (71c) of the interlocking plate (71)
When the cutting blade (3) is difficult to catch due to a dead secondary battery, a force is applied to the interlocking plate (71) in the pulling direction. This makes it easier to pull up the cutting blade (3).

(96) is a can support provided on the front surface of the main body case (K).
Is appropriately separated from the case (K). Reference numeral (97) is a canister holding shaft, and reference numeral (98) is a magnet for attracting a can lid attached to an arm (99) which is rotatable in a horizontal direction.

The operation of the above configuration will be described. The normal cutting blade (3) is at the blade lowering position shown by the solid line in FIG. 2, and in order to perform the cutting operation, first, the second push button (83) is pressed with the thumb of the right hand to cut blade (3).
Is pulled up to the position of the broken line in the same figure, the can (N) is held by the left hand, the edge thereof is placed on the drive wheel (1), and the side surface is brought into contact with the support base (96). Then, when the pressing force of the second push button (83) is released, the cutting blade (3)
Comes down, and the edge (3D) comes into contact with the lid (N ₁ ). Next, press the first push button (56) with your thumb to turn on the operation switch.
However, this state is held by the engagement of the step portion (59) (see FIG. 8). When the operation control switch (S) is turned on, the drive wheel (1) starts to rotate, the can (N) rotates, and the cutting edge (3) automatically moves from the edge (3D) to the lid (N ₁ ) easily. The bite lid (N ₁ ) is cut. lid
After finishing cutting (N ₁ ), press the second push button (83) halfway
The operating portion (83c) comes into contact with the second operating portion (56c) of the first push button (56), the engagement of the first push button (56) is released, and the first push button (56) returns to the upper position, and the operation control switch (S) is turned off. Then, the motor (5) stops (see FIG. 6). Next, hold the can (N) with your left hand and press the second push button.
When (83) is pushed all the way, the operating lever (92) rotates, the operating lever (92) rotates the interlocking plate (71), and the cutting blade (3) is pulled up. ) Can be removed.

If the secondary battery is discharged during the above cut-off operation,
Although the cutting blade bites in as shown in Fig. 14, the cutting edge (3) has a circular arc shape centered on the fulcrum (74), so when the push button (83) is pressed, the cutting edge (N ₁ The cutting blade (3) can be easily pulled up without being caught on the incision edge (100) of (1). If it is difficult to pull up with the push button (83), the lever (75) can be held by hand.

Incidentally, the present invention is not limited to the above embodiment, for example, the mounting direction of the motor (5) is not limited to the illustration, and the transformer (T) and the batteries (b ₁ ) to (b ₃ ) are disposed at positions. Mutually changeable. Further, the shape of the main body case (K) is not limited to the handy type, but may be the table type. Further, the interlocking plate (71) may be engaged with the actuating lever (92) to maintain the blade raised state.

(G) Effect According to the present invention configured as described above, since the cutting blade is always urged in the pulling down direction, the blade pulling down operation is easy and the blade pulling up is performed by pushing in the pushing operation body. Therefore, the blade can be reliably pulled up, and further, a mechanism for engaging and holding the state of pulling down the blade and a mechanism for releasing this engagement and holding are not required, which simplifies the structure and has other great effects.

[Brief description of drawings]

1 to 15 show an embodiment of the present invention. FIG. 1 is a rear view of a partial cross section with a rear case removed, FIG. 2 is an overall front view, and FIG. 3 is an overall view. Rear view, FIG. 4 is an overall top view, FIG. 5 is a sectional view taken along line VV of FIG. 1, and FIG.
FIGS. 8 to 9 are explanatory views showing different operating states, FIG.
Figures 10 and 10 are explanatory views showing different operating states,
FIG. 11 is an exploded perspective view of essential parts, FIGS. 12 and 13 are perspective views of parts, FIG. 14 is an explanatory view of a chopping operation, and FIG. 15 is an electric circuit diagram. (1) …… Drive wheel, (3) …… Cutting blade, (5) …… Motor, (71)
…… Interlocking plate (interlocking body), (82) …… Coil spring (biasing means), (83) …… Second push button (pushing body).

Claims (2)

[Claims] 1. A drive wheel that rotates when the rotation of the motor is transmitted to the front side of a main body case that houses the motor, and a drive wheel that is vertically movable above the drive wheel and cooperates with the drive wheel to cut a can lid. In the one provided with a blade, the main body case is provided with an interlocking body that interlocks with the cutting blade and an urging means that urges the interlocking body in a cutting blade lowering direction, and the interlocking body is provided on the upper surface of the main body case. An electric cutting machine equipped with a pushing operation body that is displaced in the direction in which the cutting blade is pulled up. 2. A main body case is composed of a mechanism portion for accommodating a motor and a handle portion connected to the mechanism portion, and within a range where a thumb of a gripping side can reach in a state where the push button grips the grip portion. The electric cutting machine according to claim 1, wherein the electric cutting machine is provided.