JPH0137242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the motion of reciprocating tools.

Some reciprocating tools have a saw blade attached to a reciprocating member and perform cutting by adding additional movement in the forward direction in conjunction with this reciprocating motion. It is well known that efficiency during cutting of a workpiece can be improved by adding this additional motion in the forward direction. Furthermore, it has been proposed to provide a control member that can adjust the amount of forward additional motion from zero to a certain range, and to make the adjustment possible even when the aircraft is stopped or in operation.

A conventional mechanism for making an additional movement in the forward direction is composed of a reciprocating drive member and a guide member having a roller that guides the saw blade. The control member adjusts the connection state to change the amount of additional momentum in the forward direction.

However, when changing from a separated state to a connected state, an impact is applied when the reciprocating drive member and the guide member come into contact,
Particularly when the impact is applied while the aircraft is in operation, the impact is further applied, causing damage to related parts and shortening their service life. Furthermore, this impact shortens the life of the saw blade and causes vibration and noise in the machine body.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, alleviate the impact when the reciprocating drive member and the guide member are connected, prevent damage to related parts, extend the lifespan, and reduce vibration and noise of the aircraft body. The present invention provides a reciprocating tool.

The present invention focuses on the fact that members such as springs serve as shock absorbers, and incorporates a cushioning material between the reciprocating drive member and the guide member that are in a separated state to prevent the separated state.

An embodiment of the present invention will be described with reference to the drawings. 1st
The figure shows an electric jigsaw body 1 showing one embodiment of the present invention. FIG. 2 is an internal sectional view of the covers 2 and 3 of the electric jigsaw main body 1. FIG. 3 is an exploded perspective view of FIG. 2. The outer frame consists of a housing 4 that holds the motor, a handle 6 that houses a switch 5 that turns the motor on and off, a cover 2 that houses drive force transmission members, a cover 3, a cover that abuts against the workpiece, and a handle that houses a switch 5 that turns the motor on and off. It consists of a base 7 which is fastened to 2. The inside is configured as follows. rotation 8
A pinion 8a coaxial with the gear 9 meshes with a gear 9a of a gear 9, and the gear 9 is supported by a shaft supporting member spindle 10 via a bearing 11. That is, an eccentric shaft 9b and an eccentric shaft 9c are provided. On the eccentric shaft 9b, an elongated hole 12a of a plate-shaped reciprocating drive member 12 with the same thickness as the width of the eccentric shaft 9b is disposed in engagement,
An elongated hole 13a of a plate-shaped weight 13 having the same thickness as the width of the eccentric shaft 9c is disposed on the eccentric shaft 9c.
Through holes 12b, 12c, 12 of reciprocating drive member 12
d, through holes 13b, 13c, 13 of weight 13
d, a guide shaft 14 protruding and fixed inside the cover 2;
b, 14c, and 14d, the reciprocating drive member 12 and the weight 13 are suppressed to only reciprocate without rotating relative to the rotation of the gear 9. gear 9
A rotating member 16 having a pin 15 protruding and fixed at a position facing the eccentric shafts 9b and 9c is connected to the gear 9 by a screw 17 and a pin 18, and the reciprocating drive member 12 and the weight 13 are placed between the gear 9. Intervening arrangements are made. Movement of the gear 9 and the rotating member 16 in the axial direction is stopped by a washer 19 and a tow 20. The pin 15 protruding from the rotating member 16
A bearing 21 is inserted onto the shaft, and the connector 22 is disposed such that the bearing 21 is rotatably engaged with the inner wall 22 of the U-shaped connector 22. A cylindrical plunger 24 is held between the connector 22 and the connector holder 23. plunger 24
is the bearing 2 arranged almost perpendicular to the pin 15.
5. It is supported by a bearing 26, and its movement is suppressed only in the vertical direction. A settling ring 27 is disposed at the free end of the plunger 24 on the base 7 side, and a saw blade 29 is attached to it by a screw 28 disposed on the settling ring 27. The bearings 25, 2
The inner diameter portion 26a through which the plunger 24 of No. 6 is passed is formed as an elongated hole in the cutting direction of the saw blade 29.
is formed with a small elongated hole, and the bearing 26 is formed with a large elongated hole, and the plunger 24 uses the bearing 25 as a pivot,
It moves freely in the forward direction. or,
An end 22b of the connector 22 opposite to the pin 15 side
On both sides, a plate 31 pressed by a spring 30 is abutted against the pin 15 side. The back part 29a of the saw blade 29 opposite to the blade part 29b is the saw blade back part 2.
It is disposed in the groove 32a of the roller 32 that slides with the roller 9a and rolls with it. The roller 32 is rotatably held at an end 34a of an L-shaped guide member 34 by a pin 33, and a pin 35 engaged with the cover 3 pivotally supports the guide member 34. The end portion 34b side is disposed inside the cover 2 through the through hole 3a of the cover 3 so as to be substantially orthogonal to the reciprocating drive member 12. A spring 36 is attached to the end 12c of the motion drive member 12, and the spring 36 is disposed between the free ends of the guide member 34. A control member 37 having an eccentric shaft 37a is disposed on the upper part 34c of the guide member 34 in a relationship perpendicular to the guide member 34. The control member 37 is rotatably supported by the cover 2 and protrudes to the outside of the cover 2.
The knob 38 is engaged with the protrusion. Guide member 34
The positional relationship between the reciprocating drive member 12 and the control member 37 is such that when the knob 38 is appropriately rotated and the eccentric shaft 37a of the control member 37 is set closest to the guide member 37, the reciprocating drive member 12
The guide member 34b is kept pressed by the spring 36 at the lowest dead center of the guide member 34b.

Next, the operation will be explained. The rotation of the rotor 8 is transmitted to the gear 9 through the pinion 8a, and further rotates the rotating member 16 connected to the gear 9. Rotating member 16
The pin 15, which is fixedly protruding from the shaft, also rotates in an eccentric position. The pin 15 is engaged with the connector 22 via the bearing 21, and the pin 15
Since the bearing 21 on the shaft rolls on the inner wall 22a of the connector, the rotational motion of the pin 15 converts the reciprocating motion of the connector 22, that is, the plunger 24 into reciprocating motion. On the other hand, the eccentric shafts 9b and 9c, which are eccentric from the central axis of the gear 9 to positions facing the pin 15 of the rotating member 16, also rotate in the same way as the gear 9. Eccentric shaft 9b, 9
As described above, the reciprocating drive member 12 and the weight 13 that are engaged with the outer circumference of c do not rotate and can only move in the vertical direction. The weight 13 moves in the opposite direction to the plunger 24,
That is, the weight 13 moves in the opposite direction to the direction of movement of the plunger 24. The weight 13 serves to neutralize the unbalanced force generated at the plunger 24 and balance the main body. The reciprocating drive member 12 also has a weight 13
Repeat the reciprocating motion in the same way. This movement applies additional movement to the saw blade 29 in the forward direction via the roller 32 of the guide member 34. To explain in more detail, first, the reciprocating drive member 12 is in the uppermost state, and the eccentric shaft 37 of the control member 37 is
a is at the farthest position from the guide member 34 (that is, when the knob 38 is rotated as shown in FIG. 4)
When selected, even if the guide member 34 is in a remote position, the saw blade 29 and the roller 32 are pressed by the aforementioned plunger 24 toward the pin 15 side.
Since the guide member 34 is pressurized toward the reciprocating drive member 12 via the guide member 34, the guide member 34 is kept in pressure contact with the eccentric shaft 37a of the control member 37. The spring 36 held by the reciprocating drive member 12 is in contact with the guide member end 34b. From this state, when the reciprocating drive member 12 comes down toward the base 7 side, the spring 36 is compressed, and due to the spring pressure, the guide member 34 gradually starts to move about the pin 35, and the roller 32 moves in the forward direction. It begins to move. Thereafter, the end portion 12e of the reciprocating drive member 12 directly applies pressure to the guide member 34, thereby moving the roller 32 in the forward direction as much as possible. Thereafter, when the reciprocating drive member 12 begins to move upward, the roller 32 begins to move backward following the movement and returns to the initial position. By repeating this movement, the maximum additional movement in the forward direction is applied to the saw blade 29. Next, the reciprocating drive member 12 is in the uppermost state, and the control member 3
When the eccentric shaft 37a of No. 7 is selected closest to the guide member 34 (in the case of FIG. 5), at this time, the guide member 34
and spring 36 are not in contact. When the reciprocating drive member 12 comes down toward the base 7 side, it is first pressed by the spring 36 . There are two cases when the reciprocating drive member 12 is near the bottom dead center.
One is to move the guide member 34 using the spring 36 and the reciprocating drive member 12, and the other is to move the guide member 34 using only the spring 36. In either case, additional motion in the forward direction is applied to the roller 32 portion. Control member 37
If the position of the eccentric shaft 37a is selected to be in the middle of the above, additional momentum in the forward direction corresponding to the position of the eccentric shaft 37a will be given to the roller 32. By adjusting the control member 37, the additional momentum of the roller 32, that is, the saw blade 31, in the forward direction can be determined from a small amount to a certain range.

According to the present invention, the spring 30 interposed between the reciprocating drive member 12 and the guide member 34 can prevent the reciprocating drive member and the guide member from being completely separated, and can alleviate the impact caused by the connection of both members. In particular, if the control member is adjusted during operation, the impact may be greater than when it is stopped, and even in that case, the impact mitigation by the effect of the spring works effectively. As described above, it is possible to prevent damage to related components, prevent reduction in service life, and also contribute to reduction of vibration and noise of the aircraft body. In addition, the spring is used to provide a small amount of additional movement in the forward direction to reduce the impact on the saw blade, thereby preventing damage to the saw blade and shortening its lifespan. . In the above embodiment, a spring is interposed between the reciprocating drive member and the guide member, but the effect will not be impaired in the slightest even if a cushioning material such as rubber is used instead of the spring. , which is within the scope of the present invention.

According to the present invention, since the cushioning material is interposed between the reciprocating drive member and the guide member, it is possible to reduce the impact caused by the connection of both members, especially when adjusting the control member during operation. It can also effectively alleviate the impact and prevent damage to related parts,
It is possible to prevent the life of the saw blade from being shortened, and also to reduce the vibration and noise of the machine body, and also to prevent damage to the saw blade and to prevent the life of the saw blade from being shortened.

[Brief explanation of drawings]

Fig. 1 is a front view of an electric jigsaw showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is an exploded perspective view thereof, and Figs. 4 and 5 are sectional views around the guide member. It is. In the figure, 12 is a reciprocating drive member, 29 is a saw blade, 32 is a roller, 34 is a guide member, 36 is a spring, and 37 is a control member.

Claims (1)

[Claims] 1. A reciprocating drive member that reciprocates due to eccentricity from a rotating element, a guide member that is in pressure contact with the reciprocating drive member and has a roller that guides a cutting tool, and control that appropriately adjusts the connection between the guide member and the reciprocating drive member. A reciprocating tool having a reciprocating member, characterized in that a buffer is interposed between the reciprocating drive member and the guide member.