JPH0235443Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a support device for supporting a slider that is driven reciprocally with the blade in an electric jigsaw that performs cutting by reciprocating movement of the blade.

Prior Art In a conventional jigsaw of this type, a round bar-shaped slider s is supported by a pair of upper and lower cylindrical bearings j1 and j2, as shown in FIG.

Problems to be solved by the invention In the case of the above slider support device, both bearings j1,
Since it is necessary to arrange j2 above the top dead center and below the bottom dead center of the transmission member d attached to the slider s, the interval between both bearings j1 and j2 is equal to the vertical stroke of the transmission member d. The length of the slider s is inevitably extended, and as the slider 8 is extended, the weight and vibration of the slider s increase.

Means for Solving the Problems An object of the present invention is to provide a slider support device for an electric jigsaw that avoids the above problems, shortens the length of the slider, and stabilizes the support state of the slider. In the slider support device of the electric jigsaw of the present invention, the cross section of the slider, which is reciprocated up and down near the front end in the housing of the electric jigsaw body, is formed into a rectangular shape with short sides in the front and rear, and a slider is provided on the rear side of the slider. A pair of front and rear lower bearings each having a U-shaped slide surface in cross section below the bottom dead center of the attached transmission member, and the front and rear parts of the slider are respectively slidably fitted. are installed opposite to each other, and an upper bearing is installed near the top dead center of the transmission member, and the front part of the slider has a sliding surface having a U-shaped cross section and is slidably fitted to the front part of the slider. has.

Function: A slider that is reciprocated up and down within the housing has a rectangular cross section, and a transmission member attached to the rear side of the slider has a slide surface with a U-shaped cross section near the bottom dead center. The front and rear parts of the slider are guided and supported by a pair of fitted front and rear lower bearings, and near the top dead center of the transmission member, the slider is guided and supported by a pair of lower bearings having a U-shaped cross section. The slider has a surface and the front part of the slider is guided and supported by a fitted upper bearing.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. In the figure, 1 is a housing of the electric jigsaw main body H, 2 is a motor placed horizontally near the lower end of the housing 1, and 3 is a motor. 2 is a pinion fitted to the motor shaft 2a; 4 is a drive gear fitted to a supporter 5 horizontally supported above the motor 2 so as to be able to mesh with the pinion 3; 6 is horizontal to the drive gear 4; A bearing 7 is fitted into a front portion 6a of the drive gear 4, which is an eccentric pin inserted into the supporter 5 and supported for eccentric rotation with respect to the supporter 5.

Reference numeral 8 denotes a slider which is suspended from the front end of the housing 1 so as to be able to reciprocate up and down, and has a blade 9 attached to its lower end.The slider 8 has a rectangular cross section with short sides at the front and rear, and is formed into a square rod shape. A transmission member 10 having a U-shaped side surface is integrally attached to the rear side near the upper end of the transmission member 10 to engage the eccentric pin 6, and the slider 8 is reciprocated up and down by the eccentric rotation of the eccentric pin. be done.

11, 11 are located at the bottom dead center D1 (as shown in FIG. A pair of front and rear lower bearings are disposed below the solid line position and spaced apart from each other in the front and rear, and have a U-shaped cross section and slider 8.
A sliding surface 11a is formed which is bent to allow a tight fit.

12 is fixed above the front and lower bearings 11 in the housing 1 in order to slidably fit the front part of the slider 8 above both upper bearings 11 and support one side of the slider 8 so that the rear side of the slider 8 is open. The upper bearing has a sliding surface 12a having a U-shaped cross section.
It is formed in the same shape as both lower bearings 11, and is located near the front of the bottom dead center D1 of the transmission member 10 and has a top dead center D2.
(The position indicated by the chain line in FIG. 1) is located at the lower front.

13 is a base attached to the lower end of the housing 1 via a retainer 14, and 15 is a guide roller rotatably supported on the front end of the retainer 14 so as to be able to slide with the blade 9.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, the cross section of the slider 8 that is reciprocated up and down near the front end in the housing 1 of the electric jigsaw body H is formed into a rectangular shape with short sides in the front and back, and the slider 8 is attached to the rear side of the slider 8. Transmission member 10
A pair of front and rear lower bearings 11 are provided below the bottom dead center D1, each having a slide surface 11a having a U-shaped cross section, and the front and rear parts of the slider 8 are respectively slidably fitted. An upper bearing 12 is provided near the top dead center D2 of the transmission member 10, and has a sliding surface 12a having a U-shaped cross section, and the front part of the slider 8 is slidably fitted therein. It has been installed.

For this reason, the upper end of the slider 8 is
2 supports the transmission member 10 so that its upward movement is not obstructed, thereby shortening the installation interval between both bearings 11 and 12. As a result, the length of the slider 8 can be shortened to reduce the weight, and This has the effect of reducing vibration of the slider 8.

Further, since the slider 8 is formed into a square bar shape and both bearings 11 and 12 are formed into a concave shape, the rotational movement of the slider 8 is reliably regulated, and the vertical movement of the slider 8 is controlled by the bearings 11 and 12. 12, and the vertical movement of the slider 8 can be stabilized.

Furthermore, during cutting, the blade 9 is pushed backward by the cutting load and the vicinity of the upper end of the slider 8 is pressed forward. 8
is accurately supported against the pressing force, and the slider 8
Immigration and unauthorized operations can be eliminated.

Effects of the invention Since the present invention is configured as described above, it is possible to shorten the length of the slider to reduce the weight of the slider, reduce the vibration of the slider, and there is no need to provide a separate mechanism to stop the slider from rotating. Since there are no screws, the slider support mechanism can be simplified, and the slider can be precisely prevented from rotating by each bearing and guided accurately, stabilizing the vertical movement of the slider. Since it is divided into two parts, it has the effect of reducing the weight of the entire bearing.

Furthermore, since the vertical movement of the slider can be stabilized, not only straight line cutting work but especially curve cutting work can be performed accurately.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a cutaway side view of the main parts of an electric jigsaw, Fig. 2 is an enlarged perspective view of the main parts, Fig. 3 is a cross-sectional view of the lower bearing, and Fig. 3 is a cross-sectional view of the lower bearing. FIG. 4 is a cross-sectional view of the upper bearing, and FIG. 5 is a perspective view of a conventional slider support mechanism. 1...Housing, 8...Slider, 10...
Transmission member, 11...Lower bearing, 12...Upper bearing, D1...Bottom dead center, D2...Top dead center.

Claims (1)

[Scope of utility model registration request] The cross section of the slider, which is reciprocated up and down near the front end in the housing of the electric jigsaw body, is formed into a rectangular shape with short sides at the front and back, and the bottom dead center of the transmission member attached to the rear side of the slider is A pair of front and rear lower bearings each having a U-shaped slide surface in cross section and slidably fitted at the front and rear parts of the slider are installed below, and the transmission A support device for a slider in an electric jigsaw, characterized in that an upper bearing having a sliding surface having a U-shaped cross section and slidably fitting the front part of the slider is installed near the top dead center of the member. .