JP2547176Y2 - Jigsaw - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jigsaw provided with a plunger which moves back and forth together with reciprocation.

[0002]

2. Description of the Related Art An example of the prior art is shown in FIGS. The motor 1 rotates the gear 2 and the gear holder 3 engaged with the gear 2. The pin 4 buried at a position eccentric from the rotation center of the gear holder 3 slides and engages inside the connector 6 fixed to the plunger 5. The rear surface of the connector 6 slides in contact with a plate 7, which is urged by a spring 8 toward the pins 4.

Since the plunger 5 is supported by a bearing 9 and a bearing 10 having an inner side formed in a long hole, the plunger 5 can swing back and forth around the bearing 9 as a fulcrum. On the other hand, the cam 11 and the pin 1 engaged with the eccentric portion 2a provided on the gear 2
A swinging motion is given to the roller 14 by the roller holder 13 having the fulcrum 2 as a fulcrum. Since the roller 14 is in contact with the back surface of the saw blade 15, the swinging motion of the roller 14
And a swinging motion is given to the saw blade 15.

[0004]

In the above-described conventional configuration, the connector 6 fixed to the plunger 5 is supported by the plate 7 urged by the spring 8, and therefore, FIG.
As shown in the figure, there was a case where the inclination θ was generated with respect to the traveling direction arrow B direction. In other words, the saw blade 15 attached to the plunger 5 is similarly inclined, which causes a disadvantage that the saw blade 15 may bend at the time of cutting. An object of the present invention eliminates the conventional drawbacks described above is to suppress the occurrence of bending-out minced during cutting.

[0005]

An object of the present invention is to provide a plunger, a connector locked to the plunger, and a fulcrum provided in the plunger holder for swinging motion of each member of the plunger holder on which the back surface of the connector slides. Centered on an axis,
Also, this can be achieved by providing an elastic member which comes into contact with the plunger holder, the gear case and the upper cover.

[0006]

In the plunger portion configured as described above, the movement of the plunger is limited to only the forward and backward swinging motion about the fulcrum axis of the plunger holder and the vertical reciprocating motion transmitted to the connector. No plunger tilt occurs. In addition, the plunger holder and gear case and
Contact with the elastic member to the upper cover, in order to suppress the minute fluctuation of the plunger holder caused by the clearance between the inter-between plunger holder and the upper cover and the plunger holder and the pin, Rukoto the fluctuation is transmitted to the plunger no Kunar Therefore, the bending of the jigsaw can be prevented.

[0007]

1 to 3 show an embodiment of the present invention. 1 and 2, the rotational movement of the motor 1 is
The transmission path which is converted into the reciprocating motion and the transmission path which causes the roller 14 to swing from the eccentric portion 2a provided in the gear 2 are the same as those in the above-described prior art. On the other hand, the bearings 20 and 21 for supporting the plunger 5 are fixed to the plunger holder 22, and the rear surfaces 6 a at both ends of the connector 6 fixed to the plunger 5.
Is slidably engaged with the flat portion 22a of the plunger holder 22. The plunger holder 22 is supported by a pin 23 fixed to the upper cover 25, and is slidable in the front-rear direction with the pin 23 as a fulcrum. That is, the plunger 5 can also slide in the front-rear direction with the pin 23 as a fulcrum.

[0008] Furthermore Ru abuts Tei between and gear case 26 between the upper surface and the upper cover 25 the inner walls of the cushion 24 made of an elastic material such as rubber plunger holder 22. The cushion 24 suppresses a minute fluctuation of the plunger holder 22 due to a clearance between the plunger holder 22 and the pin 23 and a clearance between the plunger holder 22 and the upper cover 25, thereby preventing unnecessary movement of the plunger 5. Therefore, according to these configurations, as shown in FIG. 3, the back surface of the connector 6 is restricted by the flat portion 22a of the plunger holder 22, and the inclination of the connector 6 with respect to the arrow A in the traveling direction is eliminated. The same applies to the blade 15, and minute fluctuations during reciprocation and swinging movement of the plunger 5 can be suppressed. Therefore, it is possible to prevent the turning at the time of cutting.

[0009]

According to the present invention, since the plunger holder capable of suppressing the inclination of the connector and the buffer member for suppressing the minute fluctuation of the plunger holder are provided, it is possible to provide a jigsaw having no cutting and high cutting accuracy. .

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of an essential part showing one embodiment of the present invention.

FIG. 3 is a sectional view taken along line CC of FIG. 1;

FIG. 4 is a partial cross-sectional view showing an example of a conventional technique.

FIG. 5 is a perspective view of a main part showing an example of a conventional technique.

FIG. 6 is a sectional view taken along line DD of FIG. 4;

[Explanation of symbols]

5 is a plunger, 6 is a connector, 15 is a saw blade, 20, 2
1 is a bearing, 22 is a plunger holder, 23 is a pin, 24
Is a cushion, and 25 is an upper cover.

Claims (1)

(57) [Scope of request for utility model registration] 1. An eccentric rotary pin embedded in a rotary member, a connector slidably engaged with the eccentric rotary pin, a plunger engaged with the connector and having a saw blade at a lower end for reciprocating movement, and an up and down movement of the plunger. In a jigsaw in which the saw blade performs minute swinging movement also in the front-back direction in conjunction with the reciprocating movement, a bearing that supports the plunger is supported by a plunger holder, and both ends of the connector are engaged with the plunger holder, A jigsaw, wherein the plunger holder is provided with a fulcrum of the swinging movement in the forward and backward directions and further provided with an elastic member which comes into contact with the plunger holder, the gear case and the upper cover.