CN2853254Y

CN2853254Y - Reciprocating saw

Info

Publication number: CN2853254Y
Application number: CN 200520077959
Authority: CN
Inventors: 陈亚生
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2005-11-25
Filing date: 2005-11-25
Publication date: 2007-01-03
Anticipated expiration: 2015-11-25

Abstract

The utility model discloses a drag saw, comprising a body case and a generator, wherein the generator is provided with an output shaft. A first gear is connected with the output shaft, a second gear is engage with the first gear, one end of an actuating arm is eccentrically and rotatably connected with the second gear, and the other end is connected with a reciprocating lever. The main body of an actuating device comprises a guide rail wherein the reciprocating lever can move back and forth. The reciprocating lever is fixedly connected with a back saw blade. A cam is connected with the second gear or forms as a whole. The actuating device comprises a first end and a second end, wherein the second end can rotate around the first end with the effect of the cam. Thereby the actuating arm converts the rotation of the second gear into the alternating motion of the reciprocating lever. When the actuating device swings under the effect of cam, the guide rail on the actuating device swings, thereby the reciprocating the lever which moves regularly along the guide rail swings with its alternating motion. As the cam surface and the back saw blade are on the same surface, the lateral whine of the back saw blade during its swinging is avoided. Compared with the prior technology, the device has the advantages of simple and compact structure and reliable function.

Description

Reciprocating saw

Technical field

The utility model relates to a kind of reciprocating saw, such as the sabre saw, relates in particular to the saw blade swing mechanism of reciprocating saw, belongs to the cutting tool field.

Background technology

Reciprocating saw comprises a reciprocating lever usually, connects saw blade, and reciprocating lever is made axially reciprocating under driven by motor, and then the drive saw blade is made reciprocal cutting movement.On this basis, also develop the reciprocating saw that saw blade swing in a kind of cutting process.Saw blade comprises two strokes in the reciprocating motion process, one is the cutting stroke, and another is a recovery stroke.In the time of in the cutting stroke, saw blade lifts to cut direction, thereby improves cutting efficiency, and saw blade in Recovery Process the back pendulum takes place simultaneously, leaves cutting position, is beneficial to saw blade and resets.

In order to realize the swing of saw blade, utilize rocking bar to control the reciprocating lever swing in the prior art commonplacely.Utilize rocking bar to realize the saw blade swing, need a series of transmission mechanisms to control the swaying direction of rocking bar,, make machine intimate construct more complicated like this in order to avoid cause the saw blade side direction to rock.In addition, the position of rocking bar is generally perpendicular to drive rod, and needs big activity space.Owing to above these reasons, such machine construction complexity, and volume is bigger, is unfavorable for cutting and assembling.

Summary of the invention

The purpose of this utility model provides the reciprocating saw that a kind of improved saw blade can be swung, and this reciprocating saw has the internal structure of simple compactness.

In order to realize this function, the reciprocating saw that the utility model disclosed comprises a casing, a motor, motor has an output shaft, one first gear is connected with output shaft, one second gear and first gears engaged, drive rod one end is connected with second gear prejudicially and rotationally, the other end is connected pivotly with a reciprocating lever, a drive body partly comprises a guide rail, described reciprocating lever can move back and forth in guide rail, and reciprocating lever is fixedlyed connected with a saw blade, and cam is connected with second gear or makes one, described transmission device comprises one first end and one second end, wherein the relative casing of first end is fixed, and second end can be biased on the cam, and described second end can rotate around first end under the cam effect.

In the reciprocating saw of this structure, drive rod is converted into the rotation of second gear reciprocating motion of reciprocating lever, when transmission device second end is biased on the cam, guide rail on the transmission device is swung, thereby along the reciprocating lever of guide rail movement swing clocklike takes place in reciprocating.Because cam surface and saw blade in same plane, have avoided saw blade to rock in the side direction that back and forth reaches in the swing process.Therefore, such device compared with prior art also has simple structure, the advantage of reliable in function.

Second purpose of the present utility model is that whether saw blade is swung when making the operator can choose at random cutting.

In order to achieve this end, second end of the transmission device of the reciprocating saw that the utility model disclosed comprises movably parts, this movable part has two positions, in the time of on being positioned at primary importance, second end of transmission device is biased on the cam, when described movably parts were positioned on the second place, second end of transmission device did not contact with cam.

When the operator selects when movably parts place on the primary importance, the rotation of cam promotes transmission device second end, and the reciprocating saw saw blade is realized the swing function; Will be movably when parts place on the second place as the operator, second end of transmission device does not contact with cam, thereby chute do not rotate, and saw blade is only done straight reciprocating motion.Be not that all material all is fit to saw blade swing cutting, if material hardness is too high, the swing of saw blade tends to cause fractureing of saw blade during cutting.Whether this reciprocating saw that the utility model provides makes the operator to swing saw blade and selects.

It is the wearing and tearing that reduce part that the utility model also has a purpose.

To achieve these goals, second end of the transmission device of the reciprocating saw that the utility model disclosed comprises a bearing pin and a rotating rolling bearing, and when second end of transmission device was biased on the cam, this rolling bearing contacted with cam.

Cam will drive rolling bearing and rotate when contacting with this rolling bearing, and will roll along cam.Rolling friction takes place between cam and the rolling bearing, but not many sliding frictions of the prior art, thereby reduced both wearing and tearing, can keep the amplitude of fluctuation of saw blade preferably, increased the service life of machine.

Description of drawings

Come preferred implementation of the present utility model is described in further detail below in conjunction with accompanying drawing

Fig. 1 is the schematic diagram of the preferred implementation of the reciprocating saw that discloses of the utility model, and wherein partial component is broken away;

Fig. 2 is the schematic perspective view of the partial component when reciprocating saw is not realized saw blade swing function among Fig. 1;

Fig. 3 is the schematic perspective view of the partial component when reciprocating saw can be realized saw blade swing function among Fig. 1;

Fig. 4 is the explosive view of partial component among Fig. 1.

The specific embodiment

As shown in Figure 1, reciprocating saw 10 comprises 1, one motor 2 of a casing and is positioned at casing, can drive output shaft 3 rotations.The other end of output shaft 3 connects one first gear 4, the first gears 4 and one second gear 5 Vertical Meshing, thereby second gear 5 rotates along with the rotation of motor 2.First end 61 of a drive rod 6 is connected with second gear 5 prejudicially, and can freely rotate around fixed axis 7; Second end 62 of drive rod 6 can be pivotally connected to together by a pin 23 mutually with reciprocating lever 8, on the pin 23 roller 9 is housed also.Reciprocating saw 10 also comprises a transmission device 20.Transmission device 20 comprises a guide rail, the direction of motion of guiding reciprocating lever 8.In the present embodiment, guide rail is a chute 11, and roller 9 is installed in the chute 11.When motor 2 is driven, 5 rotations of second gear, first end 61 of drive rod 6 is around 51 rotations of the axle center of second gear 5, thereby second end, the 62 drive rollers 9 of drive rod 6 roll back and forth along chute 11, thereby realize the reciprocating motion of reciprocating lever 8, the saw blade 12 that is connected in reciprocating lever 8 bottoms carries out reciprocal cutting movement thereupon.

In order to make saw blade 12 can realize the swing function, connect a cam 13, both coaxial rotation on second gear 5.Cam 13 also can be made of one with second gear 5.As shown in Figure 2, chute 11 1 ends are being fixed a countershaft 14, and rotating shaft 14 is connected (not showing on the figure) with casing 1, so transmission device 20 can 14 rotate around the shaft.Transmission device 20 also comprises 15, bearing pins 16 of a pair of lug and is connected between two lugs 15.Transmission device 20 also comprises one by rolling bearing 17 with dial and turn round the 18 movably members of forming, and is positioned on the bearing pin 16.In the present embodiment, rolling bearing 17 and dial that to turn round 18 be separable, its three-dimensional structure diagram is seen Fig. 4.As seen from the figure, rolling bearing 17 contains a circle groove 19, dials to turn round 18 and contain a pair of shift fork 21, and shift fork 21 matches with groove 19, turns round 18 and can promote rolling bearing 17 along bearing pin 16 slips so external force acts on to dial.Dial and to turn round 18 and also comprise a confined planes 22.In the present embodiment, rolling bearing 18 can freely rotate around bearing pin 16.

Dial and to turn round 18 and can promote rolling bearing 17 along bearing pin 16 move left and right, when rolling bearing 17 is positioned on the primary importance A shown in Figure 2, rolling bearing 17 does not contact with cam 13, confined planes 22 going up of restriction lugs 15 are put simultaneously, when so motor 2 starts, transmission device 20 remains static basically, and saw blade 12 is made reciprocal cutting movement.

Dialled when rolling bearing 17 and to turn round 18 when being pushed to second place B shown in Figure 3 and going up, rolling bearing 17 contacts with cam 13.When cam 13 rotated, rolling bearing 17 rolled along cam 13 surfaces, and the effect of cam 13 makes transmission device 20 swing up and down around roller bearing 14, thereby chute 11 also swings, chute 11 and then swing passed to reciprocating lever 8 and saw blade 12.

The reciprocating saw that the utility model disclosed is not limited in above embodiment, for the technical staff of the industry, can derive multi-form specific embodiment by the design principle of foregoing invention, still belongs to the utility model protection domain.

Claims

1. reciprocating saw, comprise a casing, a motor, motor has an output shaft, one first gear is connected with output shaft, one second gear and first gears engaged, drive rod one end is connected with second gear prejudicially and rotationally, the other end is connected pivotly with a reciprocating lever, a drive body partly comprises a guide rail, described reciprocating lever can move back and forth in guide rail, and reciprocating lever is fixedlyed connected with a saw blade, it is characterized in that: cam is connected with second gear or makes one, described transmission device comprises one first end and one second end, wherein the relative casing of first end is fixed, and second end can be biased on the cam, and described second end can rotate around first end under the cam effect.

2. reciprocating saw according to claim 1, it is characterized in that: second end of transmission device comprises movably parts, this movable part has two positions, in the time of on being positioned at primary importance, second end of transmission device is biased on the cam, when described movably parts were positioned on the second place, second end of transmission device did not contact with cam.

3. reciprocating saw according to claim 2 is characterized in that: second end of described transmission device comprises a bearing pin, and the movably parts of described transmission device comprise a carriage that is positioned on the bearing pin.

4. reciprocating saw according to claim 2 is characterized in that: described movable part comprises a stopping means, and when it was positioned at the second place, stopping means restriction transmission device rotated.

5. reciprocating saw according to claim 1 is characterized in that: second end of transmission device comprises a bearing pin and a rotating rolling bearing, and when second end of transmission device was biased on the cam, this rolling bearing contacted with cam.

6. reciprocating saw according to claim 1 is characterized in that: a roller rollably is positioned at guide rail, and is connected with reciprocating lever.