JPH0729674B2 - Electric cutting machine - Google Patents

Description

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

(B) Conventional Technology A table-top type electric cutting machine, which performs vertical movement of a samurai and ON / OFF of a motion control contact by a push button operation, is known from Japanese Patent Publication No. 51-3257. According to this conventional example, the vertical movement operation mechanism of the cutting blade and the operation control mechanism of the motor are inevitably in a vertical arrangement relationship. Not suitable. Further, there is a problem that the mechanism for controlling the cutting blade and the motor with a single push button becomes complicated.

(C) Problems to be Solved by the Invention The present invention solves the above problems and is excellent in operability,
Moreover, it is an object of the present invention to provide an electric cutting machine which can reduce the thickness of the main body case.

(D) Means for Solving the Problems In the present invention, the first push button for the samurai operation is provided on the upper surface of the mechanism portion so as to protrude, and the portion near the first push button protrudes further toward the tail side than this. It is characterized in that a second push button for operating a motor having a low height is provided in a protruding manner.

(E) Action By the above means, the up and down movement of the cutting blade can be operated by operating the first push button with the thumb of the hand holding the handle, and the ON / OFF of the motor can be controlled by operating the second push button. Can control the cutting operation. When operating the first push button, the protruding height of the second push button is low, and the risk of unnecessarily driving the motor can be reduced.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings. The gear cutting machine shown in the figure is a hand-held rechargeable gear cutting machine, which is a drive wheel (raised tooth) (1) and a front drive wheel provided on the front surface of the body case (K) so as to be rotatable. By a samurai (3) provided so as to be vertically movable above, the can is opened while rotating the can. The cutting machine has a drive wheel drive mechanism (A) for rotationally driving the drive wheel (1) and a cutting blade operation mechanism (B).
The drive wheel drive mechanism (A) mainly comprises a mechanical component (A ₁ ) for driving the drive wheel (1) at a low speed by the motor (5) and an electrical component (A ₂ ) for electrically controlling the motor. Including and

[1] Main Body Case The main body case (K) is made of synthetic resin and is detachably coupled with screws (6), (7), (8), and (9), and a front case (K ₁ ) and a rear case (K). ₂ ) and a flat shape (horizontal width L _1L front-back width L ₂ ) are formed, and from a functional point of view, mainly a mechanism portion (10) for accommodating the machine component (A ₁ ) and a rectangular handle window (11). ) And a substantially U-shaped grip portion (12) connected to the mechanism portion (10). The front case (K ₁ ) is divided into a first part (K ₁₁ ) corresponding to the mechanism part (10) and a second part (K ₁₂ ) other than the first part (K ₁₁ ), and both parts (K ₁₁ ) (K ₁₂ ). ) The tongue piece (13) and the first portion (K ₁₁ ) protruding from the second portion (K ₁₂ ) to overlap with the first portion (K ₁₁ ) while engaging with the projection and the groove And are polymerized and fixed by screws (not shown).

[2] Drive Wheel Drive Mechanism-Mechanical Components (A ₁ ) Next, the drive wheel drive mechanism (A) will be described. The mechanical 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) projects toward the head side (right side in FIG. 1) side, and the electric terminals (16) and (16) face toward the tail side (left side in FIG. 1). A partition which is perpendicular to the thickness direction of the mechanism part (10) (direction parallel to the paper surface of FIG. 1) and is horizontally oriented and is integrally erected on the first part (K ₁₁ ). Wall (17) (1
A drive shaft (15) is attached to the partition wall (17) so as to penetrate the partition wall (17), and is fixed to the partition wall (17) with 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 so as to project 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, and is inward from the first portion (K ₁₁ ). First gear (G ₁ ) rotatably supported by a metal shaft (24) protruding from the first shaft, and a large-diameter synthetic resin gear meshing with a small-diameter gear (23) of the first gear (G ₁ ). A second gear rotatably supported by a metal shaft (27) projecting inward from the first portion (K ₁₁ ) and having a metal small-diameter gear (26) located behind (25) and (G _2), the small diameter gear of the second gear (G ₂₎ (2
The third gear (G) fixed to the rear end of the metal shaft (29) that is rotatably supported by the bearing sleeve (28) that is integrally projecting with the first portion (K ₁₁ ) and that meshes with 6). ₃ ) consists of. The axis (2
A screw groove (31) is formed at the front end of 9), that is, a portion protruding from the front case (K ₁ ), and the drive wheel (1) is detachably screwed to this portion. The rear ends of the shafts (24) (27) (29) are fixed to the boss portions (32) (33) of the front case (K ₁ ) by screws (not shown) that are fixed to the metal support plate (3).
It is supported by 4).

[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 through a rectifier diode (D ₁ ). Battery (b ₁ ) (b ₂ ) (b ₃ ), operation control switch (S) provided in the energizing circuit of motor (5), diode for backflow prevention connected in series to the secondary side of transformer (T) (D ₃ ), a light emitting diode (LED) and a resistor (R) that are turned on when charging, and a diode (D ₂ ) that is connected so as to turn on the light emitting diode (LED) during operation.

Referring to FIG. 3, the charging plug (35) has a base portion (35b) made of synthetic resin having pivot shafts (35a) (35a) projecting from both ends, and two plug blades insert-molded into the base portion (35b). (35c) (3
5c), and is attached to the rear case (K ₂ ) in a position near the handle window (11) close to the motor (5) and the gear mechanism (14) so as to be retractable by rotation. Specifically, a plug accommodating recess (37) is formed in a protrusion (36) that is partially protruded according to the thickness of the motor (5) of the rear case (K ₂ ), and this recess (37) Put the plug (35) in the rear case (K ₂ )
The shafts (35a) (35a) are housed in the bearing grooves (38) (38) formed in the recess (37) from the inside. 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 behind the recess (37). Projected state with the case (K ₂ ) projecting vertically (see Fig. 4)
It is configured to be rotatable between and. On the other hand, in the second part (K ₁₂ ) of the front case (K ₁ ), the terminal block (41) is mounted with the fixed contact plates (39) (39) facing the plug (35).
(41) is integrally projected toward the rear case (K ₂ ), the charging plug (35) is stored in the recess (37), and the front case (K ₁ ) and the rear case (K ₂ ) are joined together. Then, the pivot shafts (35a) (35a) are fitted in the bearing recesses (42) (42) provided in the terminal blocks (41) (41). (43) is a T-shaped leaf spring installed between the terminal blocks (41) (41) and the support plate (34), and has a base (43a) in a recess between the terminal blocks (41) (41). The terminal block (41) (41) and the projecting part (34a) are laterally positioned by fitting the support plate (34) to the rear projecting part (34a), and the base part (43a) is positioned. Place on the step ribs (44) (44) provided on the terminal block (41) (41), and place it on the horizontal part (43b).
Is placed on the support plate (34) (see FIG. 1), and the protrusion (not shown) provided on the base part (35b) comes into contact with the protruding / withdrawn state due to the rotation of the charging plug (35). Holds by its own elastic deformation. If the plug blade (35c) (35c) of the charging plug (35) is protruding, the plug blade (35c) (35c)
The rear end protruding from the base part (35b) of the contact plate (39) (3
It is elastically contacted with the plug blade (35c) (35c) and contact plate (3).
9) (39) is held in electrical connection with the plug blade (3
5c) (35c) When immersed, this electrical connection is released.

The transformer (T) is a storage space (12) under the handle (12).
The ribs (45) are positioned and arranged near the motor (5) of A). Since this position is close to the charging plug (35), the high voltage wiring can be short. Two of the secondary batteries (b ₂ ) and (b ₃ ) are ribs (46) on the tail side of the transformer (T) in the lower storage space (12A) and the rising wall of the front case (K ₁ ) ( 47) is positioned and arranged, and the remaining one (b ₁ ) is the upper storage space (12B) of the handle (12).
The ribs (48) ... and the rising wall (47) of the front case (K ₁ ) are positioned and arranged at the tail end of the. The former two (b ₂ ) and (b ₃ ) are in direct contact with each other, 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 movable with the fixed contact plate (54) attached to the printed circuit board (53) inserted between the rib (51) and the rib (52) of the front case (K ₁ ). The contact plate (55) is mainly composed of a second push button (56) for pressing the movable contact plate (55). Referring to FIG. 6, the second push button (56) has a semi-circular groove (57) formed on the rising wall (47) of the front case (K ₁ ).
A tubular part (5) that can be inserted into a hole (57) formed by a) and a semicircular groove (57b) formed in the rising wall (58) of the rear case (K ₂ ).
6a) and the first operating portion (56b) integrally connected to the lower end of the tubular portion (56a) so as to face the pressing portion (55a) of the movable contact plate (55) and the tubular portion (56b). 56a) It is composed of a second operating part (56c) which is continuously provided on the opposite side of the lower end from the first operating part (56b) and has a slope (50) formed by obliquely notching the head side corner upper surface. The cylindrical portion (56a) has a stepped portion (59) at one end that engages with the peripheral edge (58) of the hole (57) and keeps 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) formed in the front case (K ₁ ) and the rear case (K ₂ ) on the front side and the rear side of the lower end of the tubular portion (56a) (the rear case side is not shown). Guide grooves (62) (62) (front side not shown) are formed. This guide rib (61) (61)
Extend vertically, but upper (61a) and lower (61b)
And are offset in the left-right direction, that is, the lower part (61b) is the upper part (6b).
It is formed to be deviated to the head (right side in FIG. 1) side with respect to 1a). When the push button (56) is pushed due to the eccentric structure of the guide ribs (61) (61), the push button (56) is displaced to the head side.
Next, the tubular spring receiver (56) formed inside the tubular portion (56a)
d) A coil spring (64) is interposed between the disc-shaped spring receiver (63) integrally formed on the front case (K ₁ ) (see FIG. ₁ ),
With respect to the center of the tubular spring receiver (56d),
By displacing the center of 3) toward the head, the lower part is deviated from the upper part of the coil spring (64) (see Fig. 1), and the push button ( Five
6) receives a force that moves toward the head.

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 formed into the first operating portion (56).
The push projection (65) of b) is used to push the push button (56), and the elastic force of the movable contact plate (55) urges the push portion (55a) toward the head. In addition, the tubular part (5
The tail side of the upper surface of 6a) is formed as a low stepped portion (65) and an inclined surface (67) is formed between it and the high stepped portion (66). With this structure, when the upper surface of the push button (56) is pressed with the thumb, a force is easily generated in the head 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 head side of the printed circuit board (53). The tip of the third gear (G ₃ ) is exposed on the upper surface of the window (68) formed on the upper surface of the first portion (K ₁₁ ) so as to stand upright.

[4] Cutting Blade Operating Mechanism (B) Next, the configuration 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 main body case (K). Referring to FIG. 5, (71) is provided with a rotary shaft (73) rotatably supported in a shaft hole (72) formed in the first portion (K ₁₁ ) in 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 that is rotatably provided, and the cutting blade (3) is a fulcrum (74), that is, a rotating shaft (73). It is rotatable around the central axis. The tip fixing portion (73a) of the rotating shaft (73) is smaller in diameter than the other portion and is formed in a square shape (as long as it is non-circular), and the fixing lever (75a) has a corner formed by a synthetic resin lever (75). After being press-fitted in the hole (76), the cutting blade (3) is fitted in the square hole (77) formed in the upper part thereof and having a shape matching the fixing portion (73a), and the screw formed in the fixing portion (73a). It is fixed to the fixing portion (73a) by a screw (79) screwed into the hole (78).

The lever (75) has a function of holding the interlocking plate (71) by press-fitting so as not to easily fall out from the main body case (K), and a constant distance of the cutting blade (3) from the front surface of the main body case (K). It has the function of a spacer to hold and the lever (7
5) A hook piece (75a) is integrally formed on the upper edge of the front edge, and the function as a blade lifting lever that turns the lever (75) upward by placing a finger on this hook piece (75a) is used. It is also configured to serve. Further, the rear end of the handle piece (75a) 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 as shown in FIG. 14, and is a fulcrum between the lower end of the side edge (3A) on the head side and the lower end of the side edge (3B) on the tail side (right side in the figure) ( An arcuate cutting edge (3C) is formed around the center of the upper part (74), and a lower end corner portion on the head side (corner side corner) is cut out to form an acute bite nidge (3D). The interlocking plate (71) has one end locked in the main body case (K) and the other end locked by the protrusion (71d) formed on the interlocking plate (71) by the coil spring (82). It is urged in the P direction, that is, the blade lowering direction.

6 and 13, reference numeral (83) is a synthetic resin first for raising the blade, which is provided closer to the grip portion on the upper surface of the mechanism portion (10) and closer to the head than the second push button (56). With a push button, a cylindrical part (83) that slides up and down in a button hole (84) formed on the upper surface of the body case (K).
a) and the first working part for raising the blade (83
b) and a second operation part (83c) for operation stop, and a spring bearing (85) formed on the main body case (K) and a spring bearing (83d) formed inside itself (see FIG. 1). It is constantly urged upward by a coil spring (86) interposed therebetween. The protruding height of the first push button (83) is lower than that of the second push button (56) as shown in FIG. The second operating portion (83c) is the second push button (56) (see FIG. 8) which is locked in the operating state.
Located above the slope (50) of the operating part (56c), the slope (8
7) is formed and the second push button (5
6) Move it toward the tail and release the push button (56). The slopes (50) (87) may have either one. (89) (89) is a pair of guide ribs (the rear case side is not shown) formed on the front case (K ₁ ) and the rear case (K ₂ ), which are formed on the front side and the rear side of the tubular portion (83a). It is fitted in the grooves (91) (91) (the front side is not shown) to guide the tubular portion (83a) up and down. Reference numeral (92) is a synthetic resin actuating lever rotatably supported by a shaft (93) projecting in the main body case (K). The actuating portion (83b) is actuated when the first push button (83) is pushed in the middle portion. ) And a pin (71a) projecting on the interlocking plate (71) when the actuating lever (92) rotates when the operating lever (92) pivots. It has the 2nd engaging part (92b) which engages. This operating lever (9
In 2), an operating arm portion (92c) that is easily elastically deformed is integrally formed in the upper middle portion, and an engaging groove portion (71b) formed in the interlocking plate (71) when the first push button (83) is pushed at the tip thereof. A pin-shaped engaging portion (94) that engages with the second push button (56) and a release arm portion (92d) on the side opposite to the operating arm portion (92c) with respect to the shaft (93). It is formed so as to face the operating portion (56c), and when the second push button (56) descends, the second operating portion (56c) pushes the release arm portion (92d) and engages with the aforementioned engaging groove portion (71b). The engagement with the part (94) is released.

Reference numeral (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 interlocking plate (71) is provided.
The contact plate (71) abuts the protrusion (71c) of the blade and slightly urges the interlocking plate (71) in the blade pulling up direction. A force is exerted on the cutting blade (3) in the pulling direction to facilitate pulling up of the cutting blade (3).

(96) is a can support provided on the front surface of the main body case (K),
The can (N) is appropriately separated from the case (K). (9
7) is a cane holding shaft, and (98) is a magnet for attracting a can lid attached to a horizontally rotatable arm (99).

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). A transformer (T) and a secondary battery (b ₁ ), which are next to the mechanism (14) and have the heaviest weight, are placed on the side substantially opposite to the mechanism (14)
By arranging (b ₃ ) to balance the left and right weights, 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 inserted into a power outlet for charging, an excessive rotational moment is not applied to the charging plug, and damage to the charging plug (35) can be prevented.

The operation of the above configuration will be described. The cutting blade (3) is pulled up to the initial state (see the dashed line in FIGS. 6 and 1)
, The handle (12)
Is held with, for example, the right hand, the can (N) is held with the left hand, and its edge (winding portion) is placed on the drive wheel (1), and the side surface is brought into contact with the support base (96). Then, when the second push button (56) is pressed,
The operating lever (92) is rotated to disengage the interlocking plate (71) from the operating lever (92), and the cutting blade (3) is lowered,
The edge (3D) comes into contact with the lid (N ₁ ) (see FIG. 7). Further, when the second push button (56) is pressed, the contacts (54) (55)
And the operation control switch (S) is turned on, and this state is held by the engagement of the stepped 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 blade (3) automatically moves from the edge (3D) to the lid (N ₁ ) easily. The bite lid (N ₁ ) is cut. When the first push button (83) is pushed halfway after the lid (N ₁ ) has been cut off, the second operating portion (83c) comes into contact with the second operating portion (56c) of the second push button (56) and the second push button The engagement of (56) is released 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 first push button (83) to the end to rotate the operating lever (92).
The interlocking plate (71) rotates and the cutting blade (3) is pulled up,
The pulled-up state is maintained by the engagement between the engaging portion (94) and the engaging groove portion (71b), and the initial state is restored. The can (N) can be removed in this state. When the first push button (83) is operated, the second
Since the protruding height of the push button (56) is lower than that of the first push button (83), the second push button (56) is less likely to be pushed unnecessarily, which is safe.

If the secondary battery is discharged during the above cut-off operation,
As shown in Fig. 14, the cutting blade is in the biting state, but the cutting blade (3)
Since the shape of the blade edge is formed in an arc shape centering on the fulcrum (74), pressing the push button (83) does not cause the blade edge to catch on the incision edge (100) of the lid (N ₁ ), making it easier to cut. The blade (3) can be pulled up. If it is difficult to pull up with the push button (83), the lever (75) can be held by hand.

(G) Effect According to the present invention configured as described above, since the first push button and the second push button are arranged in the head-to-tail direction, the vertical movement operation mechanism of the cutting blade and the operation control mechanism of the motor are left and right. It can be provided in a layout relationship, can provide a structure suitable for a horizontally elongated handheld electric cutting machine with a small amount of space at the bottom, and can realize a thin main body case, as well as an operation method with a single push button The mechanism can be simplified as compared with the conventional example. or,
Since the protruding height of the second push button for controlling the motor is lower than that of the first push button for operating the cutting blade, it is possible to reduce the risk of unnecessarily energizing the motor when operating the cutting blade. Is big.

[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, (10) …… Mechanical part, (12) …… Grip part, (56) ……
Second push button, (83) ... First push button, (K) ... Main body case.

Claims (1)

[Claims] Claim: What is claimed is: 1. A motor and a reduction gear mechanism connected to a drive shaft of the motor are housed in a mechanism of a main body case which is composed of the mechanism and a handle connected to the mechanism. An upper surface of the mechanism section, comprising a drive shaft that is connected to an output end of the reduction gear mechanism and rotates, and a cutting blade that is vertically movable above the drive shaft and that cuts a can lid in cooperation therewith. A first push button for operating the cutting blade, and a second push button for operating the motor having a lower protruding height than the first push button in the vicinity of the first push button. Electric cutting machine.