JPH0610033B2 - Electric cutting machine - Google Patents

Description

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

(B) Conventional Technology An electric cutting machine which moves a cutting blade up and down by pushing a 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 engagement is released 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 biasing force of 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. If so, 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 It is an object of the present invention to solve the above-mentioned drawbacks and to facilitate the cutting operation by providing a mechanism for holding the cutting blade in the raised state.

(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 vertically movable. In the one provided with a cutting blade that works to cut out the can lid, with an interlocking plate that interlocks with the cutting blade in the main body case, and a biasing means that biases this interlocking plate in the cutting blade pulling down direction, A push button provided on the upper surface of the main body case for displacing the interlocking plate in the cutting blade pulling up direction, a holding means for holding the same displacement position by engaging with the interlocking plate when displaced to the cutting blade pulling up position of the interlocking plate, And a releasing means for releasing the engagement.

(E) Action When the cutting blade is pulled up by pushing the blade raising push button against the urging force of the interlocking plate urging means by the above means, the interlocking plate is held in the cutting blade pulling state by the holding means. In this state, after placing the cantilever on the drive wheel, the engagement is released by operating the release means, the cutting blade is pulled down by the biasing force of the biasing means, and the drive wheel is rotated. Cut off.

(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
(K) A canister is rotated by a drive wheel (cannon feed tooth) (1) provided so as to project from the front face of the canister and a cutting blade (3) provided above the front face drive wheel so as to be vertically movable. 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). Driving wheel
It includes a mechanical component (A ₁ ) for driving (1) at a low speed and an electrical component (A ₂ ) for electrically controlling the motor.

[1] Main body case The main body case (K) is made of synthetic resin and has screws (6)
Front case (K ₁ ) that is detachably connected by (7), (8) and (9)
A rear case (K ₂₎ because flat (lateral width L ₁ >> longitudinal width L ₂₎
In view of a functional point of view, the mechanical part (10) mainly accommodating the mechanical component (A ₁ ) and the rectangular handle window (11) are connected to the mechanical part (10) so as to have a rectangular shape. U-shaped handle
It consists of (12) and. 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 ). 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.
The tongue piece (13) and the first portion projecting so as to overlap the portion (K ₁₁ ).
(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 drive shaft (15) of the motor (5) comes first
At right angles to the thickness direction of the mechanical section (10) (projected to the paper surface of FIG. 1) so that it projects toward the (right end in FIG. 1) side and the electric terminals (16) and (16) are on the rear (left end in FIG. 1) side. The drive shaft (15) is formed on the partition walls (17) and (18) that are configured to be parallel to each other and are oriented in the horizontal direction and that are integrally erected on the first portion (K ₁₁ ). It is attached so as to penetrate through the partition wall (17) and is fixed to the partition wall (17) by a screw (not shown) that penetrates through 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 First gear (G ₁ ) rotatably supported by a metal shaft (24) protruding from the first gear
Large diameter gear (2) made of synthetic resin that meshes with the small diameter gear (23) of (G ₁ ).
5) and a metal small-diameter gear (26) located behind it, and a second gear (rotatably supported by a metal shaft (27) protruding inward from the first portion (K ₁₁ ). G ₂ ) and this second gear (G ₂ )
Of the metal shaft (2) rotatably pierced and supported by the bearing tube (28) that meshes with the small diameter gear (26) of the above and is integrally projected on the first portion (K ₁₁ ).
9) A third gear (G ₃ ) fixed to the rear end. A screw groove (31) is formed at the front end of the shaft (29), that is, a portion protruding from the front case (K ₁ ), and the drive wheel (1) is detachably screwed to this portion. The screw groove (31) is formed so that the rotation direction (X) of the shaft (29) and the screwing direction of the drive wheel (1) are opposite. The rear end of the shaft (24) (27) (29) is the front case (K
It is supported by a metal support plate (34) fixed by screws (not shown) screwed into the bosses (32) (33) of ( ₁ ).

The gear ratio of the reduction gear mechanism (14) is set to, for example, 268: 1, and the gear ratio of the worm gear (21) and the first gear (G ₁ ) is 33: 1, which means that a small gear is large. 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) Charging plug (35), step-down transformer connected to this
(T), three secondary (rechargeable) batteries (b ₁ ) (b ₂ ) (b ₃ ) consisting of Ni-Cd batteries connected to the secondary side of this transformer via a rectifying diode (D ₁ ). , An operation control switch (S) provided in the energizing circuit of the motor (5), a reverse current blocking diode (D ₃ ) connected in series to the secondary side of the transformer (T), and a light emitting diode (LED) that lights up during charging. ), A resistor (R), and a diode (D ₂ ) connected to light a light emitting diode (LED) during operation.

Referring to FIG. 3, the charging plug (35) has pivot shafts (3
5a) A base part (35b) made of synthetic resin having a protruding portion (35a) and two plug blades (35c) (35c) insert-molded in the base part (35b), 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 protrusion (36) partially protruded according to the thickness of the motor (5) of the rear case (K ₂ ).
Bearing recesses (38), (38) formed by forming a plug storage recess (37) in the recess (37) and forming a plug (35) in the recess (37) from the inside of the rear case (K ₂ ). ), The shafts (35a) (35a) are housed so as to be fitted. Then, the plug (35) is recessed into the recess (37) and 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 protruding state (see FIG. 4) in which the case (K ₂ ) is made to project perpendicularly. On the other hand, the second part (K ₁₂ ) of the front case (K ₁ ) has terminal blocks (41) (41) with fixed contact plates (39) (39) mounted facing the plug (35) in the rear case.
It is integrally projected toward the (K _2), accommodating the charging plug (35) into the recess (37) the front case (K ₁₎ and rear case (K ₂₎ when joining the terminal block (41) The bearing recesses (42) (42) provided in the (41) are configured such that the pivot shafts (35a) (35a) are fitted therein. (43) is the terminal block
(41) A T-shaped leaf spring installed between the support plate (34) and the support plate (34), in which the base portion (43a) is fitted in the recess between the terminal blocks (41) (41) and By providing a rearward protruding portion (34a) on (34), the terminal block (41) (41) is positioned left and right by the wall and the protruding portion (34a), and the base portion (43a) is connected to the terminal block (41) ( 41) Step ribs (4)
4) Place it on (44), place the horizontal part (43b) on the support plate (34) (see FIG. 1), and see the retracted state due to the rotation of the charging plug (35) as the base part. The protrusion (not shown) provided on (35b) has a function of holding by elastic deformation of itself by abutting. If the plug blade (35c) (35c) of the charging plug (35) is protruding, the plug blade
(35c) The rear end protruding from the base (35b) of (35c) has a contact plate (3
9) (39) is elastically contacted, plug blades (35c) (35c) and contact plate (39) (3
9) is held in electrical connection with the plug blade (35c) (35c)
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 electrons
(b ₂ ) and (b ₃ ) are positioned and arranged on the rear side of the transformer (T) in the lower storage space (12A) by the ribs (46) and the rising wall (47) of the front case (K ₁ ). The remaining one (b ₁ ) is a rib (48) at the rear end of the upper storage space (12B) of the handle portion (12) and a rising wall (47) of the front case (K ₁ ). It is positioned and arranged. The former two (b ₂ ) and (b ₃ ) are directly contacted with each other, and the other one (b ₁ ) is electrically connected using a 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 ).
... 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 is referred to as the rising wall (4) of the front case (K ₁ ).
Semicircular groove (57a) formed in 7) and rising wall (58) of rear case (K ₂ ).
A cylindrical portion (56a) that can be inserted into a hole (57) that is formed by a semicircular groove (57b) formed in and a movable contact plate at the lower end of this cylindrical portion (56a).
Similarly to the first operating portion (56b) integrally connected to the pressing portion (55a) of (55), it is connected to the opposite side of the first operating portion (56b) at the lower end of the tubular portion (56a). The second operating portion (56c) is provided and has a slope (50) formed by obliquely notching the top surface of the leading side corner.
The tubular portion (56a) engages with the peripheral edge (58) of the hole (57) at one end and forms a stepped portion (59) for keeping the movable contact plate (55) in contact with the fixed contact plate (54). is doing.

Various measures have been taken to facilitate the engagement of the stepped portion (59). First, a pair of guide ribs (61) (61) (not shown on the rear case side) formed on the front case and the rear case of the lower end of the tubular portion (56a) on the front case (K ₁ ) and the rear case (K ₂ ), respectively. Guide grooves (62) (62) (front surface side not shown) are formed. The guide ribs (61) (61) extend in the vertical direction, but the upper part (61a) and the lower part (61b) are laterally displaced from each other,
That is, the lower part (61b) is at the top of the upper part (61a) (the right end in FIG. 1).
It is formed to be deviated to the side. This guide rib (61) (61)
When the push button (56) is pushed due to the eccentric configuration, 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), and by displacing the center of the disc-shaped spring receiver (63) toward the beginning with respect to the center of the cylindrical spring receiver (56d), the lower part is biased with respect to the upper part of the coil spring (64). The push button (56) receives the force of moving in the leading direction by the original 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, push the thumb with the thumb (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) so that the light emitting diode (LE)
D) is the third gear in which the front side of the printed circuit board (53) is extended
Stand upright on the front side of (G ₃ ).
The tip is exposed on the upper surface through the window (68) formed on the upper surface of (K ₁₁ ).

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

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 does 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 above the lever (75). Form a hook piece (75a) integrally on the edge in the front, and then make 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 the (75a) abuts the upper surface of the arm support base (90), which will be described later, and serves as a defining means for defining the lowest pulling position of the cutting blade (3). This defining means may be provided in the main body case (K).

The cutting blade (3) has a substantially rectangular shape as 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). ) Is formed at the center, and an arcuate cutting edge (3C) is formed, and a lower end corner portion (corner side corner portion) on the leading side is cut out to form an acute bite edge (3D). The interlocking plate (7
1) one end is locked in the main body case (K) and the other end is the interlocking plate (7
A coil spring (82) as a biasing means that is locked to the protrusion (71d) formed in 1) is biased in the P direction of FIG. 5, that is, in the blade lowering direction.

(83) is a synthetic resin second push button for raising the blade, which is provided on the upper surface of the body case (K) on the top side of the first push button (56) with reference to 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), The coil spring (86) provided between the spring receiver (85) formed in (K) and the spring receiver (83d) formed inside itself (see FIG. 1) is always urged upward. The second operating portion (83c) is the second operating portion (5) of the first push button (56) (see FIG. 8) locked in the operating state.
6c) is located above the slope (50) to form a slope (87),
By pushing the second push button (83), the first push button (56) is displaced in the rearward direction, and the engagement of the push button (56) is released. The slope (50) (8
7) 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 the cylindrical portion (83a) is fitted into a pair of grooves (91) and (91) formed in front of and behind the cylindrical portion (83a) (the front side is not shown). Guide up and down. (92) is the body case
A synthetic resin actuating lever rotatably supported by a shaft (93) protruding in (K), abuttingly engaging the actuating part (83b) when the second push button (83) is pushed in the middle part. First engaging portion projecting to
(92a), and at the tip of the interlocking plate (7
Second engaging portion (92b) that abuts and engages with the pin (71a) protruding from 1)
have. The actuating lever (92) is integrally formed with an actuating arm (92c) which is easily elastically deformed in the upper middle part, and the engaging lever formed on the motion plate (71) when the second push button (83) is pushed at the tip thereof. A pin-shaped engaging protrusion (94) that engages with the recess (71b) is formed. The operating arm portion (92c) constitutes a holding means for holding the blade raising displacement position of the interlocking plate (71) by engaging with the interlocking plate (71). Also, the operating lever (92) is related to the shaft (93) with the operating arm (92c).
The release arm (92d) on the opposite side to the second operation part of the first push button (56)
It is formed so as to face the (56c), and when the first push button (56) descends, the second actuating portion (56c) pushes the release arm portion (92d) and the above-mentioned engaging recess (71b) and engaging portion ( The first push button (56) and the release arm portion (92d) form the engagement releasing means for releasing the engagement with 94).

Reference numeral (95) is a U-shaped leaf spring attached to the main body case (K), and when the cutting blade (3) is in a lowered state, the protrusion (71) of the interlocking plate (71) is
It abuts against c) and urges the interlocking plate (71) slightly in the pulling up direction. Even when the cutting blade (3) is difficult to catch due to a dead secondary battery, the interlocking plate (71) is pulled up in the pulling up direction. A force is applied to make it easier to pull up the cutting blade (3).

(96) is a can support stand provided on the front surface of the main body case (K).
(N) is appropriately separated from 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. 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), in order to perform the chopping operation, hold the can (N) with the left hand and hold its edge (winding part) with the drive wheel ( 1) Place it on top and abut the side surface on the support base (96). Next, when the first push button (56) is pressed, the operating lever (92) is rotated to move the interlocking plate (71) and the operating lever.
The engagement with (92) is released, the cutting blade (3) is lowered, and the edge (3D) comes into contact with the lid (N ₁ ) (see FIG. 7). Further, when the first push button (56) is pushed, the contacts (54) (55) come into contact with each other, the operation control switch (S) is turned on, and in this state, the stepped portion (59) is held (8th position). (See figure). When the operation control switch (S) is turned on, the drive wheel (1) starts to rotate, the can (N) rotates, and the cutting blade (3) automatically and easily moves from the edge (3D) to the lid (N ₁ ). The bite lid (N ₁ ) is cut. When the second push button (83) is pushed halfway after the lid (N ₁ ) has been cut off, the second operating portion (83c) causes the first push button (83c) to move.
The first push button (56) is released from its engagement by contacting the second actuating portion (56c) of (56) and returns upward, the operation control switch (S) is turned off, and the motor (5) is stopped. (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 cutting blade (3) is pulled up by rotating the (71), and the engaging portion (94)
The pulled-up state is maintained by the engagement of the engaging recess (71b) with each other, and the initial response 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) is formed in an arc shape around the fulcrum (74), so when the push button (83) is pressed, the cutting edge (N ₁ The cutting edge (3) can be easily pulled up without being caught by 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.

The present invention is not limited to the above-described embodiment, and for example, the mounting direction of the motor (5) is not limited to the illustrated direction, and the transformer (T) and the batteries (b ₁ ) to (b ₃ ) are arranged at the positions. Mutually changeable. The shape of the main body case (K) is not limited to the handy type, but may be the table type.

(G) Effect According to the present invention configured as described above, since the cutting blade is always urged in the pulling down direction by the urging means, the blade pulling down operation is easy and the blade pulling up is the push button pushing operation. Since the blade can be reliably pulled up, a mechanism for engaging and holding the blade pulled-down state and a mechanism for releasing the engaged and held state are unnecessary, and the structure is simplified. Furthermore, since the cutting blade can be held in the raised state, it is not necessary to continuously press the blade lifting push button when the can is narrowed by the drive wheel and the cutting blade, and workability is good.

[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, (7
1) …… Interlocking plate, (83) …… Push button, (K) …… Main 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. In the one provided with a blade, an interlocking plate interlocking with the cutting blade and an energizing means for energizing the interlocking plate in a cutting blade pulling down direction are provided in the main body case, and are provided on an upper surface of the main body case. A push button for displacing the interlocking plate in the cutting blade pulling up direction, a holding means for holding the displacement position of the interlocking plate at the cutting blade pulling up position by engagement with the interlocking plate, and a releasing means for releasing the engagement. An equipped electric cutting machine.