CN102615348A

CN102615348A - Reciprocating saw

Info

Publication number: CN102615348A
Application number: CN2012101056289A
Authority: CN
Inventors: 黄跃
Original assignee: NINGBO HEISONG TOOLS CO Ltd
Current assignee: NINGBO YINGFUSHENG BRAND INTERNATIONAL CO., LTD.
Priority date: 2012-04-11
Filing date: 2012-04-11
Publication date: 2012-08-01
Anticipated expiration: 2032-04-11
Also published as: CN102615348B

Abstract

The invention discloses a reciprocating saw. The reciprocating saw comprises a shell, a motor serving as a power source, a gearwheel in linkage with the power output end of the motor, and a first connecting rod which is hinged with a first reciprocating rod fixed with a first saw blade, and is characterized in that a cam swinging system is arranged on one end surface of the gearwheel; the cam swinging system comprises a cam support which rotates with the gearwheel synchronously, and a first cam on one side of the cam support; the cam support is eccentrically hinged with the first cam through a first cam pin; a first arc-shaped hole with the first cam pin as a circular center is formed on the first cam; a second cam pin fixed on the cam support is inserted into the first arc-shaped hole; and the first connecting rod is hinged on the first cam. The reciprocating saw can provide a large stroke and a small stroke and can meet requirements on strokes for cutting workpieces made of different materials at the same time.

Description

Reciprocating saw

Technical field

The present invention relates to a kind of reciprocating saw, especially a kind of have a two-pass reciprocating saw.

Background technology

Electric reciprocating saw is a kind of instrument relatively more commonly used; Be widely used in industries such as automobile, propagation, wooden model, decoration, leather; Upper and lower reciprocating motion through saw blade; On workpiece such as timber, metal, plastics, rubber, carry out straight line or curvilinear cut, regulate the left and right angle of base plate and then can carry out the inclined-plane cutting.

Normally used reciprocating saw generally all is that a motor drags an eccentric wheel, realizes reciprocal cutting movement thereby drive reciprocating lever.When reciprocating lever was reciprocating, inevitable fastening at this axle produced vibration.Install a balance weight shell additional and can eliminate the part amount of unbalance, but be difficult to offset perpendicular to the unbalanced component of this system.Since saw blade be folk prescription to cutting, so the cutting cause that arteries and veins increases state, anti-cutting force is born by machine fully, can't eliminate.

For this reason; The applicant has done improvement; A kind of novel sweep-saw is disclosed in publication number is the one Chinese patent application of CN102350545A; Comprise head and the motor that is arranged in the said head, be hinged with an end of first connecting rod prejudicially on first drive that links with the motor shaft extension end of said motor that the other end of said first connecting rod is hinged with first reciprocating lever that is fixed with first saw blade; Also include second drive that links with said motor shaft extension end; Said second drive is hinged with an end of second connecting rod prejudicially, and the other end of said second connecting rod is hinged with second reciprocating lever that is fixed with second saw blade, also is provided with simultaneously to make said first reciprocating lever and said second reciprocating lever keep one at interval and can straight-line straight line position-limit mechanism; Said first saw blade is clamped in respectively on the medial surface of pressing close to mutually of said first reciprocating lever and the said second reciprocating lever bottom with second saw blade, and the straight reciprocating motion of said first saw blade and second saw blade is in the opposite direction.

Through symmetrically arranged two cover reciprocating structures, the impact vibrations in moving back and forth have been eliminated.Yet, in the use of reciprocating saw, often need cut the workpiece of differing texture; As need the different stroke of reciprocating saw when cutting soft workpiece with hard workpiece; And series excited machine can only provide a rotating speed under the constant frequency that lights a cigarette, firm power situation, can't realize two-pass; Thereby existing one-stroke reciprocating saw can not satisfy different stroke needs to different workpiece, thereby influenced use.

Summary of the invention

Technical problem to be solved by this invention provides the reciprocating saw that a kind of work piece cut stroke that can satisfy unlike material simultaneously requires.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of reciprocating saw; Comprise casing and as the motor of power source; With the gear wheel of the clutch end of said motor interlock, and with the first connecting rod that first reciprocating lever that is fixed with first saw blade is hinged, it is characterized in that; One end face of said gear wheel is provided with the cam oscillation system; Said cam oscillation system includes the Cam rest that rotates synchronously with said gear wheel, and first cam that is positioned at said Cam rest one side, and said Cam rest is hinged prejudicially through first cam pin and said first cam; Offer on said first cam with said first cam pin is first arcuate socket in the center of circle; Be equipped with second cam pin that is fixed on the said Cam rest in said first arcuate socket, said first cam pin, second cam pin all fix with said gear wheel, are hinged with said first connecting rod on said first cam.

Said cam oscillation system also comprises second cam that is positioned at said Cam rest opposite side; Said Cam rest is hinged prejudicially through the 3rd cam pin and said second cam, and offering on said second cam with said the 3rd cam pin is second arcuate socket in the center of circle, is equipped with the four-cam pin that is fixed on the said Cam rest in this second arcuate socket; An end of said second cam and second connecting rod is hinged simultaneously; The other end of said second connecting rod is hinged with second reciprocating lever that is fixed with second saw blade, and thus, reciprocating saw is two saw blade structures; Has two-pass; Drag with connecting rod, reciprocating lever, make straight reciprocating motion in the opposite direction of first saw blade and second saw blade, make machine bear a upward force and a downward power simultaneously thus; Make machine bear the making a concerted effort almost nil of external force and unbalanced phenomenon can not occur, so it has eliminated the impact vibrations in moving back and forth fully.

Preferably; Said the 3rd cam pin and first cam pin, said second arcuate socket and said first arcuate socket are that the center is symmetrical set with the center of circle of said Cam rest respectively; Two cover reciprocating structures are symmetrical set; Make the direction of straight reciprocating motion of first saw blade and second saw blade opposite fully, make machine bear external force to make a concerted effort be zero.

The synchronous rotation of Cam rest and gear wheel can realize through coaxial mounted mode, preferably, said first cam pin, second cam pin, the 3rd cam pin and four-cam pin is all fixed with said gear wheel, thereby transmits the rotation of gear wheel.

Also be fixed with on the said casing and the contacted cushion of said first, second reciprocating lever; Said casing also is fixed with the guide rail that is used to guide said first, second reciprocating lever at fixing said cushion place; Cushion and guide rail realize guiding the function of reciprocating lever jointly, reduce the wearing and tearing in reciprocating motion of reciprocating lever and casing, prolong its service life; The motion of both direction through the restriction reciprocating lever; Both guaranteed the straight reciprocating motion of reciprocating lever, made also that the distance between the reciprocating lever can keep necessarily being beneficial to the motion of saw blade.

In order to improve the security of use, the both sides of said Cam rest be provided with that shape and Cam rest periphery be complementary with the fixing frame sliding track of said casing, the periphery of said Cam rest is positioned at the inboard groove formation matched in clearance of said frame sliding track.

Motor and gear wheel realize that linkage manner is preferably, and described clutch end is provided with bevel gear, the end face tooth of described gear wheel for being meshed with this bevel gear.Can certainly adopt the kind of drive that has other now.

Compared with prior art; The invention has the advantages that: through the cam oscillation system is set; On the Cam rest one side, cam is set, arcuate socket is set on cam, make the bearing pin that is fixed on the Cam rest can in arcuate socket, be in nearly centre convergence state and unfold state; Thereby make saw blade have two different working strokes, so that same reciprocating saw can satisfy the cutting needs of the workpiece of differing texture simultaneously; Cam and two that two symmetries especially are set fall and along the rack saw bars workpiece are cut, and its cutting makes a concerted effort to equal zero, and instrument does not bear cutting force, make the cutting process quite stable.

Description of drawings

Fig. 1 is the cutaway view of reciprocating saw of the present invention;

Fig. 2 is the partial sectional view of Fig. 1 right side after looking;

Fig. 3 is the decomposition texture sketch map of reciprocating saw of the present invention;

Fig. 4-1 is the sketch map of cam swing system of the present invention when little stroke;

Fig. 4-2 is the rearview of Fig. 4-1;

The sketch map that Fig. 5-1 is a cam swing system of the present invention when big stroke;

Fig. 5-2 is the rearview of Fig. 5-1.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Referring to Fig. 1 to Fig. 3, a kind of reciprocating saw comprises casing 1 and as the motor of power source; The clutch end 11 of motor and gear wheel 2 interlocks, in the present embodiment, clutch end 11 is provided with bevel gear 12; Gear wheel 2 is a face gear; Bevel gear 12 is meshed with gear wheel 2, and the main shaft 21 of gear wheel 2 is supported on the casing 1 through bearing, and the gear wheel 2 and the casing 1 of reciprocating saw are rotatably connected.Thus, the rotation of motor can drive gear wheel 2 rotations.

The another side that gear wheel 2 does not have the end face tooth is provided with cam oscillation system 3, and this cam oscillation system includes the Cam rest 31 that rotates synchronously with gear wheel 2, and first cam 32 and second cam 33 that are symmetricly set on Cam rest 31 two sides.Cam rest 31 is rounded, and its both sides are provided with the frame sliding track 34 that casing 1 form fit and reciprocating saw is fixed, and the periphery of Cam rest 31 is positioned at a frame sliding track 34 inboard grooves 341 and forms matched in clearance.The one side of Cam rest 31 is hinged with first cam 32 prejudicially through first cam pin 321, and another side is hinged with second cam 33 prejudicially through the 3rd cam pin 331.Offer on first cam 32 with first cam pin 321 is first arcuate socket 322 in the center of circle; Be equipped with second cam pin 323 in first arcuate socket 322; Offering on second cam 33 with the 3rd cam pin 331 is to be equipped with four-cam pin 333 in second arcuate socket, 332, the second arcuate sockets 332 in the center of circle.Above-mentioned first cam pin 321, the 3rd cam pin 331, second cam pin 323 and four-cam pin 333 all fix with gear wheel 2; Preferably, first cam pin 321 and the 3rd cam pin 331, first arcuate socket 322 and second arcuate socket 332 are respectively with the setting that is centrosymmetric of the center of circle of Cam rest 31.

First cam 32 is hinged with an end of first connecting rod 4; Second cam 33 is hinged with an end of second connecting rod 5; The other end of first connecting rod 4 is hinged through the first connecting rod pin 41 and first reciprocating lever 6, and the other end of second connecting rod 5 is hinged through the second connecting rod pin 51 and second reciprocating lever 7.The medial surface that first reciprocating lever 6 and second reciprocating lever, 7 bottoms are pressed close to mutually clamping respectively has first saw blade 8 and second saw blade 9, and one of them saw blade is that another saw blade is a pawl along tooth.Because motor drags Cam rest 31 and drives two connecting rods, affects two reciprocating levers, does the reciprocating motion of upper and lower symmetry after the combination, unbalanced phenomenon can appear in not being arranged so that of symmetry.And when a saw blade moved upward, another saw blade moved downward, machine bear simultaneously one upwards, a downward power, make machine bear the almost nil with joint efforts of external force, machine is obviously descended by the vibration that cutting causes.

Also be fixed with the cushion 13 that contacts with first reciprocating lever 8, second reciprocating lever 9 on the casing 1, also be fixed with the guide rail 14 of guiding first reciprocating lever 8, second reciprocating lever 9 in this position.

Change the positive and reverse steering of motor, just can change Cam rest 31 suitable, turn to counterclockwise, thereby realize the switching between big or small two strokes.Referring to Fig. 4-1 and 4-2; When doing clockwise motion under the drive of Cam rest 31 at motor; Lock respectively at first cam pin 321 and the 3rd cam pin 331 under the situation of swing center of first cam 32 and second cam 33; The power that is driven by first connecting rod 4 and second connecting rod 5 is pushed first cam 32 and second cam 33 to the nearly centre convergence state of Cam rest 31 respectively along second cam pin 323 and four-cam pin 333; Promptly little running is done near the center of Cam rest 31 in the center of first cam 32 and second cam 33.This little stroke is 20MM in the present embodiment, is applicable to hard workpiece, like the cutting of workpiece such as diamond.

Referring to Fig. 5-1 and Fig. 5-2; When doing counterclockwise motion under the drive of Cam rest 31 at motor; Lock respectively at first cam pin 321 and the 3rd cam pin 331 under the situation of swing center of first cam 32 and second cam 33; The power that is driven by first connecting rod 4 and second connecting rod 5 is pushed first cam 32 and second cam 33 to Cam rest 31 centers along second cam pin 323 and four-cam pin 333 respectively and is and unfolds state; Promptly big running is done away from the center of Cam rest 31 in the center of first cam 32 and second cam 33.This big stroke is 32MM in the present embodiment, is applicable to soft workpiece, like the cutting of workpiece such as aluminium, plastics.

In the above embodiments; Cam oscillation system 3 is used for having the reciprocating saw of two saw blades, and in other embodiment, cam oscillation system 3 also can be used in the reciprocating saw with single saw blade; At this moment, cam oscillation system 3 need not two cams of symmetry and only has a cam.

The above is merely preferred implementation of the present invention, should be pointed out that for those of ordinary skill in the art, not breaking away under the principle prerequisite of the present invention, can also make various deformation and improvement, and this also should be regarded as protection scope of the present invention.

Claims

1. reciprocating saw; Comprise casing (1) and as the motor of power source; Gear wheel (2) with the interlock of the clutch end (11) of said motor; And with the first connecting rod (4) that first reciprocating lever (6) that is fixed with first saw blade (8) is hinged, it is characterized in that an end face of said gear wheel (2) is provided with cam oscillation system (3); Said cam oscillation system (3) includes the Cam rest (31) that rotates synchronously with said gear wheel (2); And first cam (32) that is positioned at said Cam rest (31) one sides, said Cam rest (31) is hinged prejudicially through first cam pin (321) and said first cam (32), and offering on said first cam (32) with said first cam pin (321) is first arcuate socket (322) in the center of circle; Be equipped with second cam pin (323) that is fixed on the said Cam rest (31) in said first arcuate socket (322), be hinged with said first connecting rod (4) on said first cam (32).

2. reciprocating saw as claimed in claim 1; It is characterized in that; Said cam oscillation system (3) also comprises second cam (33) that is positioned at said Cam rest (31) opposite side; Said Cam rest (31) is hinged prejudicially through the 3rd cam pin (331) and said second cam (33); Offer on said second cam (33) with said the 3rd cam pin (331) is second arcuate socket (332) in the center of circle; Be equipped with the four-cam pin (333) that is fixed on the said Cam rest (31) in this second arcuate socket (332), said second cam (33) is hinged with an end of second connecting rod (5) simultaneously, and the other end of said second connecting rod (5) is hinged with second reciprocating lever (7) that is fixed with second saw blade (9).

3. reciprocating saw as claimed in claim 2 is characterized in that, said the 3rd cam pin (331) is that the center is symmetrical set with the center of circle of said Cam rest (31) with first cam pin (321), said second arcuate socket (332) respectively with said first arcuate socket (322).

4. reciprocating saw as claimed in claim 2 is characterized in that, said first cam pin (321), second cam pin (323), said the 3rd cam pin (331) and four-cam pin (333) all fix with said gear wheel (2).

5. reciprocating saw as claimed in claim 2; It is characterized in that; Also be fixed with on the said casing (1) and the contacted cushion of said first, second reciprocating lever (13), said casing (1) locates also to be fixed with the guide rail (14) that is used to guide said first, second reciprocating lever at fixing said cushion (13).

6. like each described reciprocating saw in the claim 1 to 5; It is characterized in that; The both sides of said Cam rest (31) be provided with that shape and Cam rest (31) periphery be complementary with the fixing frame sliding track (34) of said casing (1), the periphery of said Cam rest (31) is positioned at inboard groove (341) the formation matched in clearance of said frame sliding track (34).

7. like each described reciprocating saw in the claim 1 to 5, it is characterized in that described clutch end (11) is provided with bevel gear (12), the end face tooth of described gear wheel (2) for being meshed with this bevel gear (12).