JPH0531901U - Jigsaw - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a jigsaw having a plunger part that moves back and forth together with reciprocating motion, and an object thereof is to provide a jigsaw with high accuracy and without bending. A plunger holder 22 provided with a fulcrum pin 23 that is slidably engaged with both end rear surfaces 6a of a connector 6 fixed to a plunger 5, and is used when the blade 15 moves in the front-rear direction, an upper cover 25, and a gear case. A cushion 24 is provided between the upper surface of the plunger holder 22 and the inner wall of the upper cover 25 in order to suppress a minute fluctuation of the plunger holder 22 due to the clearance between the 26.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jigsaw having a plunger that moves back and forth together with reciprocating motion.

[0002]

[Prior 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 embedded at a position eccentric from the rotation center of the gear holder 3 is slidably engaged in the connector 6 fixed to the plunger 5. The back surface of the connector 6 contacts the plate 7 and slides, and the plate 7 is biased by the spring 8 toward the pin 4 side.

Further, since the plunger 5 is supported by the bearing 9 and the bearing 10 whose inside is formed in a long hole, it can swing back and forth around the bearing 9 as a fulcrum. On the other hand, the roller 14 is swung by the roller holder 13 with the cam 11 and the pin 12 engaged with the eccentric portion 2a provided on the gear 2 as a fulcrum. Since the roller 14 is in contact with the back surface of the saw blade 15, the swinging movement of the roller 14 gives swinging movement to the plunger 5 and the saw blade 15.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional structure, since the connector 6 fixed to the plunger 5 is supported by the plate 7 biased by the spring 8, as shown in FIG. There was a case to do. That is, since the saw blade 15 attached to the plunger 5 is similarly inclined, there is a defect that it may cause bending at the time of cutting. An object of the present invention is to eliminate the above-mentioned conventional drawbacks and suppress the occurrence of draw bending at the time of cutting.

[0005]

[Means for Solving the Problems]

 The object is to center the swing motion of the plunger, the connector locked to the plunger, and each member of the plunger holder on which the rear surface of the connector slides, around a fulcrum shaft provided in the plunger holder. This is achieved by providing an elastic member that comes into contact with the plunger holder, the gear case and the upper cover.

[0006]

[Action]

 In the plunger part configured as described above, the movement of the plunger is limited only to the back-and-forth swinging motion about the fulcrum shaft of the plunger holder and the vertical reciprocating motion transmitted to the connector, so the plunger tilt Does not occur. In addition, the elastic member that is in contact with both the plunger holder and the gear case member suppresses minute fluctuations of the plunger holder caused by clearances between the plunger holder and the upper cover and between the plunger holder and the inner wall of the gear case. Since it is not transmitted to the plunger, the bending of the jigsaw can be prevented.

[0007]

【Example】

 One embodiment of the present invention is shown in FIGS. 1 and 2, the transmission path for converting the rotational movement of the motor 1 into the reciprocating movement of the plunger 5 and the transmission path for giving the roller 14 an oscillating movement from the eccentric portion 2a provided in the gear 2 are the same as those of the above-mentioned conventional art. The same is true. On the other hand, the bearings 20 and 21 supporting the plunger 5 are fixed to the plunger holder 22, and the back surfaces 6a at both ends of the connector 6 fixed to the plunger 5 are slidably engaged with the flat surface portion 22a of the plunger holder 22. The plunger holder 22 is supported by a pin 23 fixed to an upper cover 25, and is slidable in the front and rear directions with the pin 23 as a fulcrum. That is, the plunger 5 can also slide in the front-back direction with the pin 23 as a fulcrum.

Further, a cushion 24 made of an elastic member such as rubber is inserted in contact with the upper surface of the plunger holder 22 and the inner wall of the upper cover 25. The cushion 24 suppresses minute fluctuations of the plunger holder 22 due to the clearance between the plunger holder 22 and the pins 23 and between the upper cover 25, and prevents 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 surface portion 22a of the plunger holder 22, and the connector 6 is not tilted with respect to the traveling direction arrow A, and is attached to the plunger 5. The saw blade 15 is similar, and minute fluctuations during reciprocating and swinging movement of the plunger 5 can be suppressed. Therefore, it is possible to prevent bending at the time of cutting.

[0009]

[Effect of the device]

 According to the present invention, since the plunger holder capable of suppressing the inclination of the connector and the cushioning member suppressing the minute fluctuation of the plunger holder are provided, it is possible to provide a jigsaw having a good cutting accuracy without bending.

[Brief description of 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 an embodiment of the present invention.

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

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

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

6 is a cross-sectional view taken along the line DD of FIG.

[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)

[Scope of utility model registration request] 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 reciprocating with a saw blade attached to the lower end, and an upper and lower side of the plunger. In a jigsaw in which the saw blade makes a slight oscillating motion in the forward and backward direction along with the reciprocating motion,
A bearing for supporting the plunger is supported by a plunger holder, both ends of the connector are engaged with the plunger holder, and a fulcrum of a swinging motion before and after the traveling direction is formed in the plunger holder, and the plunger holder and the gear case and A jigsaw provided with an elastic member that comes into contact with the upper cover.