JPH062516B2 - Electric cutting machine - Google Patents

Description

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

(B) Conventional Technology An electric power cutting machine which performs vertical movement of a cutting blade and ON / OFF of operation control contacts by push button operation has been known in Japanese Patent Publication No. 51-3257. When the starter push button is first pushed in, the cutting blade of this conventional example is lowered by the first movable body, and when the push button is further pushed in, the operation control contact point is closed by the second movable body. The pushing state of the first movable body is held by the engagement of the holding piece, and this engagement is released by pushing the release push button.

The structure of this conventional example has the following drawbacks. That is, the first
The movable body of is always biased upward by the first spring body, and the cutting blade moves upward due to this biasing force after the end of the canal incision, so it is necessary to increase the spring pressure of the first spring body. There is. Therefore, the pressing operation for lowering the blade of the start push button is heavy, and in order to close the operation control contact, the second movable body is linked to the second movable body in addition to the first spring body.
The spring body must also be compressed, and there is a drawback that the pushing operation for closing the operation control contact becomes heavy. Also, the operation control contact is turned off in the middle of disconnection by lightly pressing the release push button, but if the release push button is pressed too much, the holding piece will be disengaged and the release switch will be disconnected again. To continue the operation, the start push button must be pushed again, and there is a drawback that the operability of stopping and restarting the operation during the deadline is poor. Furthermore, because the vertical movement operation mechanism of the cutting blade and the operation control contact mechanism are arranged in a vertical relationship,
It has been difficult to apply this conventional structure to a horizontally-oriented handheld electric cutting machine with a small space below the vertical movement operation mechanism of the cutting blade.

(C) Problems to be Solved by the Invention In view of the various drawbacks described above, an object of the present invention is to provide an electric cutting machine which has good operability and does not have a vertically long main body shape.

(D) Means for Solving the Problems The present invention is directed to a front side of a main body case for accommodating a motor, in which the rotation of the motor is transmitted to rotate, and a driving wheel provided above the driving wheel so as to be movable up and down. In a thing provided with a cutting blade for cutting out a working can lid, an interlocking plate interlocking with the cutting blade and an energizing means for constantly energizing the interlocking plate in the cutting blade lowering direction are provided in the main body case, and A blade raising push button for displacing the interlocking plate in the cutting blade pulling direction is provided on the upper surface of the main body case, and an operation control operating member arranged near the push button for turning ON / OFF the operation control contact for controlling energization of the motor. It is characterized by having.

(E) Action By means of the above means, in order to cut the blade, the blade push-up push button is pushed against the urging force of the interlocking plate urging means to pull up the cutting blade, and then the drive wheel and the cutting blade By pinching the edge and turning on the operation control operation member, the drive wheels rotate and the can lid is incised. During the incision of the can lid, the incision is stopped by turning off the operation control operation member.
The incision is restarted by turning on the operation member.

(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 operating mechanism (B), and the drive wheel drive mechanism (A) is driven by a motor (5). 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-right width L ₁ >> front-back width L ₂ ) from the front case (K ₁ ) and the rear case (K ₂ ) that are detachably connected by (9) And a substantially U-shaped handle portion (12) connected to the mechanism portion (10) so as to have a mechanism portion (10) mainly containing the mechanical component (A ₁ ) and a rectangular handle window (11).
Consists of. The front case (K ₁ ) is divided into a first part (K ₁₁ ) corresponding to the mechanical part (10) and a second part (K ₁₂ ) other than the first part (K ₁₁ ), and both parts (K ₁₁ ) (K ₁₂ ). ) The protrusion and the groove are engaged with each other at the joint portion, and the second portion (K ₁₂ ) to the first portion (K ₁₁ )
The tongue piece (13) projecting so as to overlap with the first portion (K ₁₁ ) is 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 perpendicular to the thickness direction of () (direction parallel to the paper surface of FIG. 1) and is laid horizontally in the horizontal direction and is integrally erected on 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 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 reduction gear mechanism (14) is set to, for example, 268: 1, and the gear ratio is 33: 1 due to the worm gear (21) and the first gear (G ₁ ). The reduction ratio is

[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 batteries connected to the secondary side of this transformer via a rectifier diode (D ₁ ). Battery (b ₁ ) (b ₂ ) (b ₃ ), operation control switch (S) installed in the energizing circuit of the motor (5), reverse current blocking diode connected in series to the secondary side of the transformer (T) (D ₃ ), a light emitting diode (LED) and a resistor (R) that light up when charging, a diode (D ₂ ) that is connected to light up the 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 such a manner that the shafts (35a) (35a) are fitted into the bearing grooves (38) (38) formed in the predetermined recess (37). Then, the plug (35) is recessed into the recess (37) so that the plug (35) is flush with the protrusion (36) (see FIG. 3), and the plug blades (35c) (35c) are rearward from the recess (37). It is configured so as to be rotatable between a case (K ₂ ) and a projecting state (see FIG. 4) in which the case (K ₂ ) is projected so as to be perpendicular to the case (K ₂ ). Meanwhile, the front case
On the second part (K ₁₂ ) of (K ₁ ), the terminal block (41) (41) with the fixed contact plate (39) (39) mounted facing the plug (35) is attached to the rear case (K ₂ ).
The charging plug (35) is integrally projected toward the recess (37).
When the front case (K ₁ ) and the rear case (K ₂ ) are connected to each other, the bearing shafts (35a) are inserted into the bearing recesses (42) (42) provided in the terminal blocks (41) (41).
(35a) is configured to fit. (43) is the terminal block (41) (4
With a T-shaped leaf spring installed between 1) and the support plate (34), the base (43a) is fitted in the recess between the terminal blocks (41) (41) and the support plate (34) is attached. Providing a rear protrusion (34a) allows the terminal block to be
(41) (41) The wall and the protrusion (34a) are used for left and right positioning,
Step ribs (44) (44) provided with the base (43a) on the terminal blocks (41) (41)
Place it on top, place the horizontal part (43b) on the support plate (34) (see FIG. 1), and provide the base part (35b) with the retracted state due to the rotation of the charging plug (35). The projections (not shown) come into contact with each other to be held by elastic deformation. When the plug blade (35c) (35c) of the charging plug (35) is protruding, the plug blade (3
5c) The contact plate (39) is the rear end protruding from the base part (35b) of (35c).
It is elastically contacted with (39), plug blade (35c) (35c) and contact plate (39) (39)
And are kept in an electrically connected state, and this electrical connection is released when the plug blades (35c) (35c) are immersed.

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 front case (K ₁ ) ...
The fixed contact plate (54) and the movable contact plate (55) attached to the printed circuit board (53) inserted between the movable contact plate and the rib (52).
It is mainly composed of a first push button (56) for pressing 5). Referring to FIG. 6, the first push button (56) has a semicircular groove (57a) formed on the rising wall (47) of the front case (K ₁ ) and a rising wall (58) of the rear case (K ₂ ). ), A cylindrical portion (56a) that can be inserted into a hole (57) formed by a semicircular groove (57b) and a movable contact plate (55) at the lower end of the cylindrical portion (56a).
The first operating portion at the lower end of the tubular portion (56a), which is the same as the first operating portion (56b) integrally provided so as to face the pressing portion (55a) of the
The second actuating portion (56c) is provided continuously on the opposite side to (56b), and the upper surface of the leading corner portion is notched obliquely to form an inclined surface (50). The tubular portion (56a) engages the peripheral edge (58) of the hole (57) at one end, and the stepped portion (5) for keeping the movable contact plate (55) in contact with the fixed contact plate (54).
9) is formed.

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 into the low step portion (65) and an inclined surface is formed between the high step portion (66).
Forming (67). With this configuration, when the upper surface of the push button (56) is pushed with the thumb, a force in the head direction is easily generated.

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). With a metal interlocking plate provided rotatably, the cutting blade (3) is detachably fixed to the tip of the rotating shaft (73), and the cutting blade (3) is supported by the fulcrum (74), that is, the rotating shaft (73). It is rotatable around the central axis. The tip end fixing portion (73a) of the rotating shaft (73) is smaller in diameter than the other portion and is formed in a square shape (if it is a non-circular shape). The fixing portion (73a) is provided with a synthetic resin lever.
After the (75) is press-fitted in its square hole (76), the cutting edge (3)
Is inserted in a square hole (77) formed in the upper part of the fixing part (73a) and has a shape matching the fixing part (73a), and the screw hole (7
It is fixed to the fixing portion (73a) by a screw (79) screwed to the screw 8).

The lever (75) is press-fitted to connect the interlocking plate (71) to the main body case.
It has the function of holding it so that it will not come off easily from (K) and the function of a spacer that keeps the distance of the cutting blade (3) from the front of the body case (K) constant, and The hook piece (75a) is integrally formed on the upper edge in the front and this hook piece (75a)
It is configured to also function as a blade lifting lever that hangs a finger on the lever to rotate the lever (75) upward. Also, a claw piece
The rear end of (75a) abuts 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 as shown in FIG. 14, and has 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 figure). ) As the center, an arcuate cutting edge (3C) is formed, and a lower end corner (corner side corner) on the leading side is cut out to form an acute-angled reed edge (3D). The interlocking plate
(71) has one end locked in the main case (K) and the other end interlocking plate
A coil spring (urging means) (82) locked to the protrusion (71d) formed on (71) urges the coil spring in the P direction of FIG. 5, that is, in the blade lowering direction.

(83) is a synthetic resin second push button provided on the upper surface of the body case (K) on the top side of the first push button (56) for making up the blade, as shown in FIGS. 6 and 13. Button hole (8
4) consists of a tubular part (83a) that slides up and down, a blade-raising first operating part (83b) and a second operating part for operation stop (83c) integrally formed on the lower end of the tubular part (83a), Spring support (8
5) and spring holder (83d) formed inside itself (see Fig. 1)
It is constantly urged upward by a coil spring (86) provided between and. The second operating portion (83c) is the second operating portion (56) of the first push button (56) (see FIG. 8) locked in the operating state.
A slope (87) is formed above the slope (50) of c), and the second push button (83) is pressed to shift the first push button (56) in the rearward direction, and the push button (56) Disengage the. The slope (50) (87)
Should have either one. (89) (89) is the front case (K
₁ ) and a pair of guide ribs formed on the rear case (K ₂ ) (the rear case side is not shown), and a pair of grooves (91) (91) (front side) formed on the front and rear of the cylindrical portion (83a). (Not shown) to guide the tubular portion (83a) up and down. Reference numeral (92) is a synthetic resin operating lever rotatably supported by a shaft (93) projecting from the main body case (K), and is an operating portion when the second push button (83) is pushed in the middle portion.
A first engaging portion (92a) protrudingly provided so as to abut and engage with (83b)
Further, a second engaging portion (92b) that abuts and engages with a pin (71a) protruding from the interlocking plate (71) when the actuating lever (92) is rotated is provided at the tip. The actuating lever (92) is integrally formed with an elastically deformable actuating arm (92c) at the upper middle part, and a second push button is provided at the tip thereof.
When the (83) is pushed, the engaging groove (7) formed on the interlocking plate (71).
1b) is formed with a pin-shaped engaging portion (94), and the release arm portion (92) is provided on the side opposite to the operating arm portion (92c) with respect to the shaft (93).
d) is formed so as to face the second operating portion (56c) of the first push button (56), and when the first push button (56) descends, the second operating portion (56c) causes the release arm portion (92d) to move. Push the above-mentioned engaging groove (71b) and engaging part (9
4) Release the engagement with.

(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.

In the above-mentioned component arrangement, the mounting position of the charging plug (35) is close to the heavy motor (5) and the reduction gear mechanism (14), and the motor (5) and the reduction gear are centered around the charging plug (35). generally opposite the mechanism (14), by taking the weight balance between the left and right which like follows a heavy transformer (T) and a secondary battery (b ₁₎ are arranged - a (b ₃₎ The center of gravity (O) of the device is at the position shown in FIG. 3 and is close to the charging plug (35). As a result, when the charging plug (35) is plugged into a power outlet for charging, an excessive rotational moment is not applied to the charging plug, and the charging plug (3
5) It is possible to prevent damage to the part.

The operation of the above configuration will be described. Cutting blade in the initial state
Assuming that (3) is in the pulled-up state (see the alternate long and short dash line in FIG. 6 and FIG. 2), the can (N) must be held with the left hand and the edge (wound tightening part) of the drive wheel ( 1) Place it on top, and contact the side surface with the support base (96). Next, when the first push button (56) is pressed, the operating lever (92) is rotated and the engagement between the interlocking plate (71) and the operating lever (92) is released, and the cutting blade (3) is lowered,
The edge (3D) comes into contact with the lid (N ₁ ) (see FIG. 7).
Further, when the first push button (56) is pressed, the contacts (54) (55) come into contact and the operation control switch (S) is turned on, and this state is held by the engagement of the stepped portion (59) (8th step). See figure). Operation control switch
When (S) is turned on, the drive wheel (1) starts to rotate, the can (N) rotates, and the cutting blade (3) automatically moves from the edge (3D) to the lid (N ₁ ) so that it is difficult to insert the lid (N). N ₁ ) is cut. After cutting the lid (N ₁ ),
When the second push button (83) is pushed halfway, the second actuating portion (83c) comes into contact with the second actuating portion (56c) of the first push button (56) and the first push button (56) is disengaged. Return to upper position, operation control switch (S)
Turns off and the motor (5) stops (see FIG. 6). Next, hold the can (N) with your left hand and push the second push button (83) all the way to rotate the operating lever (92). The operating lever (92) causes the interlocking plate (71) to rotate and the cutting blade. (3) is pulled up and the engaging part
The pulled-up state is maintained by the engagement between the (94) and the engaging groove portion (71b), and the initial state is restored. The can (N) can be removed in this state.

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 method 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) is configured to engage the operating lever (92) to maintain the blade-raised state, but this engaging mechanism is deleted and the second push button (83) is removed.
The cutting blade (3) may be pulled up only when pressed. In this case, the release arm portion (92a) of the operating lever (92) is also deleted.

(G) Effect According to the present invention configured as described above, since the lowering operation of the cutting blade is performed by the urging force of the urging means of the substrate, the blade lowering operation is easy. The operation control contact can be turned on by a light operation of the operation control operation member and turned off.
Since the cutting blade is not raised by the operation, the operability of the operation stop and incision during the cutting is good. Further, the vertical movement operation mechanism of the cutting blade and the operation control contact mechanism can be arranged side by side, and the main body shape is not elongated, and a cutting machine suitable for a handy type can be provided.

[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, (56) ... First
Push button (operation control member), (71) ... interlocking plate, (82) ... coil spring (biasing means), (83) ... second push button (blade raising push button), (K) ... body case.

Claims (1)

[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. A blade provided with an interlocking plate interlocking with the cutting blade in the main body case, and a biasing means for constantly energizing the interlocking plate in the cutting blade pulling down direction, and the interlocking plate on the upper surface of the main body case. ON and OFF the push-up button for displacing the blade in the pulling-up direction of the blade and the operation control contact which is arranged in the vicinity of this push-button and controls the energization of the motor.
An electric cutting machine, comprising: an operating member for driving control.