JPH0625291Y2 - Reciprocating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a reciprocating saw in which the angle of a blade can be adjusted.

[Prior Art] Conventionally, as an electric saw in which the angle of the saw blade can be adjusted, there are JP-A-61-2501 and JP-A-58.
It is disclosed in Japanese Patent Laid-Open No. 182701 and Japanese Patent Laid-Open No. 62-7501. Further, as a conventional reciprocating saw, there is one disclosed in JP-A-54-64798.

[Problems to be Solved by the Invention] However, the electric saws disclosed in JP-A-61-2501 and JP-A-58-182701 are both jigsaw types and used for adjusting the angle of a saw blade. The knob is installed at the rear part of the spindle so that the saw blade and the knob protrude symmetrically from the housing.Therefore, when changing the angle of the saw blade during cutting of the material to be cut, check the cutting situation and saw blade and knob. While the knob is rotated while operating, in such a case, there is an operational problem that it is difficult to perform an angle adjustment operation in the positional relationship between the saw blade and the knob.

Further, Japanese Patent Laid-Open No. 62-7501 discloses a reciprocating saw type electric saw capable of adjusting an angle. This has an angle adjusting knob on the outer periphery of the saw blade, and the saw blade and the knob are simultaneously provided for angle adjustment. As can be seen, this has a problem that the total length becomes long because the input shaft and the saw blade unit are attached to the chuck of the hand drill. Further, since the saw blade unit is frictionally supported on the chuck of the hand drill, there is a problem that a large load is applied to the chuck and the drive shaft when adjusting the angle. Furthermore, since the rear end of the output shaft connected to the saw blade is engaged with the eccentric pin that changes the rotational motion of the motor into reciprocating motion, the output shaft could not be pivotally supported at one point in front of the eccentric pin, resulting in durability. There are problems in terms of stability and stability.

Further, Japanese Laid-Open Patent Publication No. 54-64798 discloses a reciprocating saw in which a shaft is supported in front of and behind an eccentric pin, and the saw blade and the drive shaft are not directly connected to each other, and the stability and durability of the shaft can be satisfied. Although it is recognized that this is a structure in which the shaft cannot rotate, there is a problem that the angle cannot be adjusted.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a reciprocating saw having excellent operability in angle adjustment, cutting workability, stability and durability.

[Means for Solving the Problems] In the present invention, an eccentric pin 1 in which a spindle 17 having a blade 28 is provided in a housing 4 so as to project from a gear 8 of a gear transmission mechanism 7 is provided.
In the reciprocating saw, the spindle 17 is supported so as to be reciprocally movable in the axial direction, and the spindle 17 is supported in parallel with the drive shaft 5 by the bearing portions 12 and 13 before and after the eccentric pin 11.
The eccentric pin 11 is slidably engaged with a recessed groove 25 formed in a lower portion of the movable bearing 20 in a direction perpendicular to the axial direction of the spindle 17, so that the spindle 17 is attached to the movable bearing 2.
The shaft hole 21 is fitted into the shaft hole 21, and the shaft hole 21 is inserted from the groove 22 provided at a right angle to the shaft hole 21 and in the vertical direction.
A pin 23 having a diameter larger than the diameter of the spindle 22 and rotatable in the groove 22.
The spindle 17 is loosely fitted to the rotary bearing 14 which is fixed to the front of the housing 4 so as to be rotatable and axially immovable, and a guide provided in the rotary bearing 14 in the axial direction. The spindle 17 is provided in the groove 18.
A rotation stopper such as a pin 19 which is fixed through the shaft is slidably and non-rotatably fitted to the rotary bearing 14 so that it can be rotated integrally with the rotary bearing 14.
9 is provided around the blade 28.

[Operation] When the switch 2 is pulled and operated, the motor (not shown) is energized, the drive shaft 5 rotates and is transmitted to the gear 8 of the gear transmission mechanism 7, and the eccentric pin 11 provided at the eccentric position of the gear 8 slides. As the eccentric pin 11 slides, the movable bearing 20 engaged with the eccentric pin 11 slides back and forth together with the spindle 17 by the retaining pin 23 fixed to the spindle 17 so as to pass through. As a result, the blade 28 provided on the spindle 17 also slides to cut the cutting material. At the time of adjusting the angle, a grip 29, which is around the blade 28 and rotates together with the rotary bearing 14 rotatably fitted to the housing 4, is operated. The spindle 17 is loosely fitted to the rotary bearing 14, and the pin 19 fixed to the spindle 17 is slidably and non-rotatably fitted in the guide groove 18 provided in the rotary bearing 14. The spindle 17 rotates as the bearing 14 rotates, and the angle of the blade 28 can be adjusted accordingly. At that time, the spindle 17
Is rotatable with respect to the movable bearing 20, so that when the angle is adjusted, only the spindle 17 having the blade 28 rotates and does not affect the drive portion.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention in a partially stepped manner. The main body 1 is formed in a gun shape, and a motor (not shown) is incorporated therein, and the switch 2 is operated to start or stop the motor.

The housing 4 fixed to the front portion of the main body 1 by screws 3 ... is equipped with a gear transmission mechanism 7 that meshes with and interlocks with a gear 6 provided on a drive shaft 5 of a motor shaft. A terminal gear 8 in the power transmission direction is fixed to a vertical shaft 9 rotatably supported by a bearing 10 in a housing 4, and an eccentric pin 11 is provided upright at an eccentric position of the gear 8. In the housing 4, cylindrical bearings 12 and 13 are integrally formed at the front and rear portions, respectively, and a cylindrical rotary bearing 14 is rotatably mounted on the front bearing 12. In the state where the axial movement is blocked, the flange 14a provided around the front end is abutted against the front end surface of the bearing portion 12, and the retaining ring 15 attached to the rear end is abutted against the inner surface of the front end 4a of the housing 4. On the other hand, a cylindrical bearing 16 is fitted to the rear bearing portion 13, and a spindle 17 is inserted into the rotary bearing 14 in a non-rotatable manner and rotatably inserted into the bearing 16. It is installed so that it can reciprocate in the axial direction.

Further, as clearly shown in FIG. 3, guide concave grooves 18, 18 are provided on the inner surface of the rotary bearing 14 so as to be long in the axial direction and face each other. On the other hand, a pin 19 is pierced and fixed to the spindle 17 in the diametrical direction. Both ends of the pin 19 are connected to the guide groove 18, 1 described above.
8 is slidably engaged with the rotary bearing 14 so that the spindle 17 is not rotated with respect to the rotary bearing 14 and is supported so as to be reciprocally movable in the axial direction.

Further, inside the housing 4, the spindle 17
Is rotatably supported by the movable bearing 20 while being prevented from moving in the axial direction.

That is, as shown in FIGS. 1, 2, and 4, the movable bearing 20 has a shaft hole 2 in the front-rear direction (left-right direction in FIG. 1).
1 is penetrated, and a groove 22 is penetrated vertically in a direction perpendicular to the shaft hole 21. The groove 22 has a long hole shape when viewed from above as shown in FIG. To mount the movable bearing 20 on the spindle 17, as shown in FIG. 4, a slide ring 24 having a diameter larger than that of the shaft hole 21 and rotatable in the groove 22 is interposed. First, the movable bearing 2
The slide ring 24 is inserted from the groove 22 of 0, and the shaft hole 21 and the hole 24a of the slide ring 24 are aligned. Then, the spindle 17 is penetrated through the aligned hole. After that, the hole 24b is penetrated together with the spindle 17 from the slide ring 24, the pin 23 is inserted into the hole 24b, and the slide ring 24 is externally fixed to the spindle 17. As a result, the spindle 17 is rotatably supported by the movable bearing 20 while not moving in the axial direction. The sliding ring 24 enlarges the area of the contact portion between the spindle 17 and the movable bearing 20 to make the sliding between the spindle 17 and the movable bearing 20 more reliable, and is not always necessary in the present invention. . That is, if the diameter of the pin 23 is made larger than the diameter of the shaft hole 21 and the pin 23 is rotatable in the groove 22, the intended operation and effect can be obtained.

Further, as shown in FIG. 2, a concave groove 25 is provided in the lower portion of the movable bearing 20 at a right angle to the longitudinal direction of the spindle 17, and the eccentric pin 11 allows the rotary ring 26 to be rotatably mounted on the concave groove 25. The movable bearing 20 is formed so as to reciprocate in the axial direction together with the spindle 17 by the eccentric amount of the eccentric pin 11 when the gear 8 rotates. There is.

Further, a grip 29 is provided around the blade 28, which is detachably fixed to the tip of the spindle 17 protruding outward from the rotary bearing 14 by a screw 27.
Of the rotary bearing 14 by fixing it to the flange 14a of the
It is arranged so as to be rotatable integrally with the grip 29 and not to be separated. By rotating the grip 29, the rotary bearing 14 is rotated integrally with the grip 29, and the engagement between the guide grooves 18, 18 and the pin 19 is made. The fitting allows the angles (directions) of the spindle 17 and the blade 28 to be arbitrarily changed.

Here, the grip 29 is formed in a substantially cylindrical shape, and a plurality of elongated holes 29b ... Is formed in the front portion of the peripheral wall 29a so as to be elongated in the longitudinal direction, and the spindle 17 and the cutting tool are formed in the front portion of the peripheral wall 29a. It is formed so as to cover around the base of 28.

[Effects of the Invention] As described above, in the reciprocating saw according to the present invention, the spindle and the drive shaft are provided in parallel, and the spindle is axially supported before and after the position of the eccentric pin that transmits the power from the drive shaft to the spindle. When adjusting the angle of the blade, the grip for adjusting the angle and the blade can be rotated while simultaneously looking at the blade, so that the workability is very good when the material to be cut is cut into other than a straight line or when the cutting direction is changed. Also,
Not only can the reciprocating saw that can adjust the blade angle be made compact, but only the spindle that is supported before and after the eccentric pin will rotate during angle adjustment, so it will not affect the drive part, and the spindle rotation will be good and the durability will be excellent. There is.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross-section of an embodiment of a reciprocating saw according to the present invention, and FIGS. 2 and 3 are II and II in FIG.
FIG. 4 is an enlarged cross-sectional view taken along line III, III, and III, and FIG. 4 is a perspective view of the movable bearing 20, the sliding ring 24, and the pin 23. 4 ... Housing, 5 ... Drive shaft 7 ... Gear transmission mechanism, 8 ... Gear 11 ... Eccentric pin, 12, 13 ... Bearing portion 14 ... Rotating bearing, 17 ... Spindle 18 ... Guide groove , 19 ... pin 20 ... movable bearing, 21 ... shaft hole 22 ... groove, 23 ... pin 28 ... blade, 29 ... grip

Claims (1)

[Scope of utility model registration request] 1. A spindle 17 equipped with a blade 28 is supported in a housing 4 via an eccentric pin 11 projecting from a gear 8 of a gear transmission mechanism 7 so as to be reciprocally movable in the axial direction, and the spindle 17 is driven. In parallel with the axis 5, the eccentric pin 11
In the reciprocating saw supported by the front and rear bearing portions 12 and 13, the eccentric pin 11 is slidably engaged with a recessed groove 25 formed in a lower portion of the movable bearing 20 in a direction perpendicular to the axial direction of the spindle 17. Then, the spindle 17 is fitted into the shaft hole 21 of the movable bearing 20, and from the groove 22 provided in the direction perpendicular to the shaft hole 21 and in the vertical direction,
A retaining member such as a pin 23 having a length larger than the diameter of the shaft hole 21 and rotatable within the shaft hole 22 is inserted to be fixed through the spindle 17 and the housing 4
Of the spindle 17 is loosely fitted in a rotary bearing 14 which is fitted to the front of the rotary bearing so as to be immovable in the axial direction, and the spindle 17 is penetrated into a guide groove 18 provided in the rotary bearing 14 in the axial direction. A rotation stopper such as a fixed pin 19 is slidably and non-rotatably engaged, and a grip 29 that is rotatable with the rotary bearing 14 is provided around the blade 28. Reciprocating saw.