JPH0335527Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a jigsaw.

Jigsaws cut using the reciprocating motion of the saw blade.
Gradually changing the inclination of the saw blade during cutting allows for smoother cutting than by simply moving the saw blade up and down. That is, as shown in FIGS. 5 to 7, even when the saw blade 1 butts against the workpiece 2, the saw blade 1 is inclined with respect to the workpiece 2 (the fifth (see figure), there are fewer cutting parts and less resistance is applied to the saw blade 1. 6 and 7 show the saw blade 1 cutting while gradually changing its inclination. When cutting is performed in this manner, a cutting force that does not change much from the beginning to the end is applied to the saw blade 1, so that cutting can be performed smoothly. However, the structures for implementing such operations have become very complex and expensive.

This invention was created in view of the above points,
It is an object of the present invention to provide a jigsaw that can easily cut a workpiece material smoothly.

Hereinafter, the present invention will be explained based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-3. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. As shown in the figure, the outer frame of the jigsaw 3 main body includes a housing 4 containing a motor, a handle 6 provided on the upper part of the housing 4, and having a switch 5 for turning the motor ON and OFF, etc.; It is comprised of covers 7, 7a, 7b connected to the housing 4 and housing a driving force transmission section, a base 8 fastened to the cover 7a and abutted against the workpiece 2, and the like.
The inside of this outer frame is configured as follows.

A pinion 9a coaxial with the rotor 9 of the motor meshes with teeth 10a of a gear 10, and the gear 10 is inserted into a spindle 11 fixedly protruding from the cover 7a. Movement of the gear 10 in the axial direction is controlled by a retaining ring 12. Being held down. A pin 13 is protruded and fixed to the gear 10 at a position eccentric from the center of rotation, and a metal 14 is inserted into the pin 13, and this metal 14 can freely roll against the inner wall 15a of the connector 15 whose outer periphery is U-shaped. The connector 15 is engaged with the connector 15 so that the connector 15 is engaged with the connector 15. The connector 15 is fixed to the plunger 16, and a spring 1 is attached to the end 15b of the connector 15.
7 is pressed against the plate 8, and as a result, the back of this blade 1 is pushed against the back roller 24
This prevents the plunger 16 and the saw blade 1 from wobbling in the direction of movement of the main body 3 when not in use. This plunger 16
Gear 10, spindle 11, pin 13, metal 1 that switches the rotational motion of the motor to up and down reciprocating motion
4. It is connected to a driving force transmitting section composed of a connector 15 and the like and reciprocates up and down, and an elongated upper bearing 19 and a lower bearing 20 are disposed on both sides thereof. A blade holder 21 is attached to the lower end of the plunger 16, and the saw blade 1 inserted therein is held by screws 22 and 23.
A back-up roller 24 that comes into contact with the back portion 1a of the saw blade 1 is attached to the cover 7a with screws 25. In the jigsaw 3 configured as described above, in this embodiment, the bearing holes of the upper bearing 19 and the lower bearing 20 each have an elongated bearing hole, and the long diameter side thereof is parallel to the traveling direction of the jigsaw 3 main body. and the lower bearing 2
The length of the major axis of the bearing hole 0 is set larger than that of the upper bearing 19. As a result, a gap is created between the outer diameter of the plunger 16 and the bearing holes of both bearings 19 and 20 in the same direction as the moving direction of the jigsaw 3 body, and the gap is larger on the lower bearing 20 side. This allows the plunger 16 to swing approximately in a pendulum-like manner in the same direction as the moving direction of the jigsaw 3 body. In addition, the diameter of the inner wall 21a of the saw blade attachment hole of the blade holder 21, which the back part 1a of the saw blade 1 comes into contact with, is formed so that it becomes almost larger downwardly, so that the saw blade 1 is aligned with the axis of the plunger 16. It is installed so that it is tilted in the direction opposite to the direction of movement of the main body. By doing this, the plunger 16 comes to be able to swing in the same direction as the moving direction of the jigsaw 3 body, and the saw blade 1 is moved by the plunger 1.
It is possible to obtain a jigsaw 3 which can be mounted obliquely in a direction opposite to the direction of movement of the main body with respect to the axis of the jigsaw 6, thereby facilitating smooth cutting of a workpiece.

That is, the rotational motion of the rotor 9 is transmitted to the gear 10, and the pin 13 fixed to the gear 10 is also transmitted to the spindle 1.
Rotate around 1. Since the pin 13 is engaged with the connector 15, the movement of the pin 13 is caused by the connector 15.
to communicate. That is, the rotational motion of the pin 13 is converted into a reciprocating motion of the connector 15. As a result, the plunger 16 connected to the connector 15 and the saw blade 1 perform reciprocating motion. By the way, the upper bearing 19 into which this plunger 16 is inserted is made into an elongated hole so that the gap with the plunger 16 is reduced so that the plunger 16 is slightly inclined in the direction of movement of the main body, and the lower bearing 20 is
The gap between the hole and the plunger 16 is increased so that the hole is so long that there is no problem even when the plunger 16 moves in the direction of movement of the main body. And a blade holder 2 in which the diameter of the saw blade 1 becomes larger toward the bottom.
The blade holder 21 was attached to the blade holder 21 along the inner wall 21a of the plunger 16 so as to be inclined backward by an angle θ with respect to the axis of the plunger 16 with respect to the direction of movement of the main body. By doing this, the plunger 16 and the saw blade 1 are supported by the upper bearing 19 due to the cumulative force during cutting and the spring 17.
Since the upper bearing 19 is pressed by the back roller 24, the movement in the direction of movement of the main body is
However, since the saw blade 1 is installed so as to be tilted backward with respect to the axis of the plunger 16, as the plunger 16 moves in the direction of movement of the main body, Its slope changes and it becomes vertical. In other words, in FIG. 3, the solid line indicates the bottom dead center of the plunger 16, and the dashed line indicates the top dead center. During the transition from the bottom dead center to the top dead center, the saw blade 1 gradually changes its inclination to a rising state. It begins to change.
In this way, the inclination of the saw blade 1 with respect to the work material gradually changes as shown in FIGS. 5 to 7 above, making it possible to cut the work material smoothly. It becomes like this. and upper bearing 19,
By changing the inner diameter of the lower bearing 20 and making the inner wall 21a of the blade holder 21 flare toward the end, the plunger 16 can swing, and the saw blade 1 can be mounted at a backward angle with respect to the direction of movement of the main body. Since this objective is achieved, there is no need to complicate the structure as in the past, and the cutting of the work material can be facilitated.

Another embodiment of the invention is shown in FIG. In this embodiment, the attachment means is formed by a saw blade 1b having a blade portion inclined at a predetermined angle in a direction opposite to the direction of movement of the main body with respect to the axis of the plunger 16.
In this case, the saw blade 1b is attached at an angle with respect to the axis of the plunger 16 in a direction opposite to the direction of movement of the main body, and the same effects as in the case described above can be achieved. In other words, the inner wall of the blade holder 21b is not inclined, and the saw blade 1
b itself forms an angle θ.

As described above, according to the present invention, it is possible to obtain a jigsaw that facilitates smooth cutting of a workpiece material and facilitates smooth cutting of a workpiece material.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main body of an embodiment of the jigsaw of the present invention, Fig. 2 is a vertical side view of Fig. 1, and Fig. 3 is an attachment of the saw blade and plunger of an embodiment of the jigsaw of the present invention. FIG. 4 is a partial sectional view showing the attachment state of the saw blade of another embodiment of the jigsaw of the present invention, and FIGS. 5 to 7 show the saw blade when cutting with a conventional jigsaw. The progress of the inclination of the blade is shown, and FIG. 5 is a sectional view at the beginning of cutting, FIG. 6 is a sectional view in the middle of cutting, and FIG. 7 is a sectional view at the end of cutting. 1...Saw blade, 1a...Back of saw blade, 1b...
...Saw blade, 2...Work material, 3...Jigsaw, 4...
...Housing, 5...Switch, 6...Handle, 7, 7a, 7b...Cover, 8...Base,
9...Rotor, 10...Gear, 11...Spindle, 13...Pin, 14...Metal, 15...Connector, 15a...Inner wall of connector, 16...Plunger, 17...Spring, 19... ...Upper bearing, 20...Lower bearing, 21...Blade holder, 21a...Inner wall of blade holder, 21b...
...Blade holder, 24... Back-up propeller.

Claims (1)

[Scope of utility model registration request] a motor having a rotor housed in a housing; a handle provided on the top of the housing and provided with a switch for driving the motor; housed in a cover connected to the handle and the housing; A driving force transmitting section that switches the rotational motion of the motor to an up and down reciprocating motion, a plunger that is connected to the driving force transmitting section and reciprocates up and down, and a blade holder that is inserted and fixed to a blade holder provided at the lower end of the plunger. The plunger includes a saw blade and a back-up roller attached to the cover so as to come into contact with the back of the saw blade, and the plunger has an upper bearing and a lower bearing provided at the upper and lower parts of the cover, respectively. In the jigsaw that is supported so as to be movable up and down, the plunger is supported by the upper bearing and the lower bearing so as to be able to swing approximately in a pendulum shape in the same direction as the traveling direction of the jigsaw body, and the saw blade is A jigsaw, characterized in that the plunger is mounted so as to be inclined in a direction opposite to the traveling direction of the main body with respect to the axis of the plunger.