Electric reciprocating saw
Technical field
The present invention relates to a kind of reciprocating saw, especially a kind of have two saw blades and can realize two-pass electric reciprocating saw.
Background technology
Electric reciprocating saw is a kind of instrument relatively more commonly used, is widely used in industries such as automobile, propagation, wooden model, decoration, leather, through the straight reciprocating motion of saw blade workpiece is cut.The cutting object of reciprocating saw can be the mixing of timber, metal or these materials, because cutting object is wider, and also easy to carry, be suitable for occasions such as house ornamentation.
Reciprocating saw commonly used all is single saw blade; With rotatablely moving of motor through various transmission mechanism; Like eccentric wheel, fork etc., be converted into the reciprocating motion of reciprocating lever, can number be the Chinese patent of CN202097463U referring to Granted publication; Granted publication number is the Chinese patent of CN2582802Y, and Granted publication number is Chinese patent of CN2877933Y etc.When reciprocating lever is reciprocating, must make whole reciprocating saw produce the vibration on Y axle, the X-direction.For eliminating this vibration; Can be through on Y direction, disposing balance weight; Yet existing reciprocating saw only whereby balance weight be difficult to be fitted on the position; And generally have the speed adjusting gear that carries out speed governing to the different operating requirement, more difficult registration aequum just when being adjusted to different speed, and on the X-direction than Y direction on more difficult configuration balance weight.
In addition and since saw blade be folk prescription to cutting, often produce the impact phenomenon of similar " recoil ", this recoil is born by the base of reciprocating saw fully.This be since saw blade in cut workpiece; Workpiece has reaction force to it, and the consequence of this reaction force is that the operator is difficult to control very exactly reciprocating saw, in operation, some phenomenons such as beat occur through regular meeting; Be difficult to when work, keep balance; The workpiece that is cut is produced some impact, be not suitable for cutting some crisp materials, and be easy to cause operator's fatigue; Make it can not use reciprocating saw for a long time, might damage the operator because of impact when serious.
Moreover, 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 is a kind of electric reciprocating saw, can eliminate vibration and reaction force through symmetrically arranged pair of saw blade, improves cutting efficiency simultaneously.
The present invention solves the problems of the technologies described above first technical scheme that is adopted: a kind of electric reciprocating saw; Comprise casing and as the motor of power source, said motor links through transmission mechanism and the reciprocating lever that is fixed with saw blade, it is characterized in that; Said transmission mechanism has two; And structure is identical, be set up in parallel, and each said transmission mechanism comprises the gear wheel with the output interlock of said motor, with the bent axle of said gear wheel center fixation; And the Oscillating lever bearing that is arranged on said bent axle periphery, two terminal both sides of output that said gear wheel is separately positioned on said motor; The said reciprocating lever that is fixed with saw blade also has two, and the said Oscillating lever bearing in each said transmission mechanism connects reciprocating lever separately.
Said Oscillating lever bearing comprises fork, the bearing outer ring that fixes with said fork, and place the bearing inner race that can do relative motion with said bearing outer ring in the said bearing outer ring, said bearing inner race has the inner ring hole of inclination; Said bent axle comprises main shaft; One end and the said gear wheel of said main shaft are fixed; The other end of said main shaft is extended with the bent axle main body that is inclination with said main shaft; Said bent axle main body penetrates in the said inner ring hole; Be provided with axially outstanding alignment pin with said bent axle main body adjacent on the end face of said main shaft, offer the stopper slot of the said alignment pin slip of confession of circumferential arc on said bearing inner race and the said main shaft opposing end faces, the two ends of said stopper slot have can with first positioning step and second positioning step of said alignment pin butt.Thus, can control the direction of rotation of motor, make reciprocating saw be operated in the state of big stroke or little stroke, with the cutting needs of the workpiece that satisfies differing texture.
Said Oscillating lever bearing also comprises the adapter sleeve that is arranged on outside the said fork, and said adapter sleeve is connected to said reciprocating lever through connecting pin, thereby the swing of fork can drive the straight reciprocating motion that reciprocating lever is done front and back.
Said bent axle main body passes that to be inserted in the crankshaft end cover coupling behind the said inner ring hole fixing, and end face and the said bearing inner race side end face of said crankshaft end cover are adaptive, to avoid bent axle and bearing inner race play when working.
Motor and gear wheel realize that linkage manner is preferably, and the output end of said motor is provided with pinion, said pinion both sides respectively with the gear wheel engagement of two said transmission mechanisms.
The present invention solves the problems of the technologies described above second technical scheme that is adopted: a kind of electric reciprocating saw; Comprise casing and as the motor of power source, said motor links through transmission mechanism and the reciprocating lever that is fixed with saw blade, it is characterized in that; Said transmission mechanism is made up of forward and backward first transmission mechanism and second transmission mechanism that connects successively; Said first transmission mechanism comprises the gear wheel with the interlock of the output of said motor, with first bent axle of said gear wheel center fixation, and first Oscillating lever bearing that is arranged on the said first bent axle periphery; Said second transmission mechanism comprises second bent axle that is connected to said first bent axle; And second Oscillating lever bearing that is arranged on the said second bent axle periphery, said first bent axle is opposite with the said second bent axle angle of inclination, and the said reciprocating lever that is fixed with saw blade also has two; Said first Oscillating lever bearing connects first reciprocating lever, and said second Oscillating lever bearing connects second reciprocating lever.
Said first Oscillating lever bearing is provided with first fork that the clutch shaft bearing outer ring with said first Oscillating lever bearing fixes, and said first fork is with first adapter sleeve outward, and said first adapter sleeve is connected to said first reciprocating lever through first connecting pin; Said second Oscillating lever bearing is provided with second fork that second bearing outer ring with said second Oscillating lever bearing fixes; Said second fork is with second adapter sleeve outward; Said second adapter sleeve is connected to said second reciprocating lever through second connecting pin, thereby the swing of fork can drive the straight reciprocating motion that reciprocating lever is done front and back.
Motor and gear wheel realize that linkage manner is preferably, and the output end of said motor is provided with pinion, said pinion and the engagement of said gear wheel.
Compared with prior art, the invention has the advantages that:, and drive the reciprocating motion that two reciprocating levers are made symmetry because motor can drag two gear wheels simultaneously; Therefore make two saw blades do motion in the opposite direction all the time, make machine bear the opposite power of both direction simultaneously thus, make machine bear the making a concerted effort almost nil of external force and unbalanced phenomenon can not occur; So machine is obviously descended by the vibration that cutting causes; Make cutting steadily, efficient is high, handling safety; Through the direction of rotation of control motor, change the relative position and the angle of bent axle main body and bearing inner race, 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; And adopt two transmission mechanisms to connect the mode that drives two reciprocating levers successively, and make that then the structure of whole transmission is simpler, also therefore reduced cost.
Description of drawings
Fig. 1 is the perspective view of reciprocating saw of the present invention;
Fig. 2 is the transmission mechanism enlarged diagram of reciprocating saw;
The front view of Fig. 3-1 Oscillating lever bearing of the present invention;
Fig. 3-2 is the cutaway view of Oscillating lever bearing of the present invention;
The sketch map of transmission mechanism (part) when Fig. 4-1 is big stroke;
The side view of transmission mechanism (part) when Fig. 4-2 is big stroke;
The front view of transmission mechanism (part) when Fig. 4-3 is big stroke;
The cutaway view of transmission mechanism (part) when Fig. 4-4 is big stroke;
Fig. 4-5 during for big stroke main shaft turn over the cutaway view of 180 ° of transmission mechanisms (part) behind the C;
The sketch map of transmission mechanism (part) when Fig. 5-1 is little stroke;
The side view of transmission mechanism (part) when Fig. 5-2 is little stroke;
The front view of transmission mechanism (part) when Fig. 5-3 is little stroke;
The cutaway view of transmission mechanism (part) when Fig. 5-4 is little stroke;
The cutaway view of transmission mechanism (part) when Fig. 6 is specific little stroke;
Fig. 7 is the sketch map of another embodiment of transmission mechanism;
Fig. 8 is the cutaway view of transmission mechanism (part) shown in Figure 7.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one
Referring to Fig. 1 and Fig. 2, a kind of electric reciprocating saw comprises casing 1; Be positioned at the grip part 2 of casing 1 end; Motor as power source places in the casing 1, and the output both sides of motor are set side by side with the identical transmission mechanism of structure 3, and transmission mechanism 3 is connected with a reciprocating lever 4 respectively.
The output end of motor is provided with pinion 5, its both sides respectively with 31 engagements of the gear wheel of two transmission mechanisms 3, thus, the rotation of rotor can drive pinion 5 and rotate, and does rotation in the opposite direction thereby drive two gear wheels 31.
Transmission mechanism 3 also comprises Oscillating lever bearing 32 and bent axle 33; Oscillating lever bearing 32 comprises fork 321; The bearing outer ring 322 that fixes with fork 321 that is positioned at fork 321 belows, and place the bearing inner race 323 in the bearing outer ring 322, fork 321 and bearing outer ring 322 can be one-body molded also can be two parts independently; Bearing inner race 323 outer surfaces offer the trajectory 3236 of annular; Confession is provided with ball 324, so that bearing outer ring 322 is done relative motion with bearing inner race 323, referring to Fig. 3-1 and Fig. 3-2.Bearing inner race 323 has the inner ring hole 3231 of inclination; Angulation is the angle of α between the central axis 3221 of bearing outer ring 322 and the central axis 3232 of inner ring hole 3231; The existence of this α angle is intended to increase the angle of inclination of bent axle 33, and the central axis of trajectory 3236 is consistent with the central axis 3221 of bearing outer ring 322.
Bent axle 33 comprises main shaft 331; One end of main shaft 331 is fixed on the center of gear wheel 31; Drive rotation by gear wheel 31; The other end of main shaft 331 is extended with the bent axle main body 332 that is inclination with main shaft 331, the central axis 3311 of main shaft 331 and the central axis of bearing outer ring 322 3221 consistent (when bearing outer ring 322 is positioned at initial position), and angulation is the angle of β between the central axis 3321 of bent axle main body 332; This β angle has determined the size of the pendulum angle of fork 321, referring to Fig. 4-4.
Bent axle main body 332 passes that to be inserted in the crankshaft end cover 333 coupling behind the inner ring hole 3231 fixing, and the end face of crankshaft end cover 333 and this side end face of bearing inner race 323 are adaptive.The central axis of crankshaft end cover 333 and the central axis 3221 of bearing outer ring 322 are consistent.
On the end face of main shaft 331; Be provided with axially outstanding alignment pin 3312 with bent axle main body 332 adjacents; Offer the stopper slot 3233 of circumferential arc on corresponding therewith bearing inner race 323 these side end faces; The two ends of stopper slot 3233 have first positioning step 3234 and second positioning step 3235 respectively, referring to Fig. 4-1.Thus, when reciprocating saw is worked, after bent axle main body 332 relatively rotates with bearing inner race 323, the alignment pin 3312 of main shaft 331 can with first positioning step 3234 or second positioning step, 3235 butts, rotate thereby bent axle 33 can drive bearing inner race 323 thereupon.
Oscillating lever bearing 32 also comprises the adapter sleeve 325 that is arranged on outside the fork 321, and adapter sleeve 325 flexibly connects through connecting pin 326 and reciprocating lever 4.Two reciprocating levers 4 laterally arrange, and connect saw blade 7 through fast clamp mechanism 6 respectively.
When rotor rotates; The terminal pinion 5 of its output drives gear wheel 31 and rotates; Thereby main shaft 331 rotates and since the alignment pin 3312 of main shaft 331 can with first positioning step 3234 or second positioning step, 3235 butts of bearing inner race 323, thereby bearing inner race 323 rotates thereupon.Because two central axis of bearing inner race 323 and bearing outer ring 322 are inconsistent and the setting of ball 324; Make bearing outer ring 322 when bearing inner race 323 rotates, do the swing of fore-and-aft direction, thereby fork 321 drive the straight reciprocating motion that reciprocating lever 4 is made fore-and-aft direction.Because the gear wheel 31 of two transmission mechanisms 3 lays respectively at the both sides of pinion 5, intercropping relative motion in the opposite direction made two reciprocating levers 4 do straight reciprocating motion in the opposite direction thus when promptly two gear wheels 31 were same.
Because be provided with inner ring hole 3231, alignment pin 3312 and stopper slot 3233 that bearing inner race tilts, reciprocating saw of the present invention has two-pass, its operation principle is described below.To Fig. 4-5, the rotation direction of main shaft 331 is (counterclockwise) shown in arrow, at this moment referring to Fig. 4-1; Alignment pin 3312 and first positioning step, 3234 butts, reciprocating saw is operated in the state of range, the α angle of this moment and the stack of β angle; Farthest increase bent axle main body 332 opposing inclined angles, thus, fork 321 pendulum angle forward is an alpha+beta; Behind main shaft 331 Rotate 180s ° C, fork 321 is swung the alpha+beta angle backward, moves back and forth with this; Referring to Fig. 5-1 to Fig. 5-4, the motor backward rotation, opposite when making the rotation direction of main shaft 331 with big stroke; Shown in arrow (clockwise direction); Because effects such as inertia, resistances, bent axle 33 relatively rotates with bearing inner race 323, and between the two relative position, angle change; Alignment pin 3312 turns to and second positioning step, 3235 butts; Reciprocating saw is operated in the state of little stroke, and the central axis of inner ring hole 3231 forms the γ angle between the projection 3321 on the central axis A-A face of projection 3232 ' on the A-A face and bent axle main body 332, and promptly the γ angle is the projection angle of angle on the A-A face; The angular range of γ is-α≤γ≤α that the pendulum angle of fork 321 is γ+β.
Referring to Fig. 6, after the angle of inclination of the angle of inclination of bent axle main body 332 and bearing inner race 323 stack, the γ value is-during α, the pendulum angle of fork 321 is β-α, i.e. the minimum stroke that reciprocating saw work is desirable.
Different values is got in radian, position through to stopper slot 3233, can be so that the value of the big stroke of different reciprocating saw, little stroke is inequality, to satisfy the needs of real work.The pendulum angle of fork 321 needn't one be decided to be alpha+beta when being big stroke, and the pendulum angle of fork 321 also needn't one be decided to be β-α during little stroke, and big stroke and little stroke are merely comparatively speaking.
Embodiment two
Referring to Fig. 7 and Fig. 8; The difference of itself and the foregoing description is; Transmission mechanism comprises forward and backward first transmission mechanism 3 ' and second transmission mechanism 3 that connects successively ", be connected to first reciprocating lever 4 ' with transmission mechanism 3, the first transmission mechanisms 3 ' that replace two independent settings; second transmission mechanism 3 " be connected to second reciprocating lever 4 ", first reciprocating lever 4 ' and second reciprocating lever 4 " be connected with saw blade respectively.First transmission mechanism 3 ' comprises the gear wheel 31 ' that meshes with the terminal pinion 5 of the output of motor, with first bent axle 33 ' of gear wheel 31 ' center fixation, and first Oscillating lever bearing 32 ' that is arranged on first bent axle, 33 ' periphery; Second transmission mechanism 33 " comprise second bent axle 33 that is connected to first bent axle 33 ' ", and be arranged on second bent axle 33 " second Oscillating lever bearing 32 of periphery ".First bent axle 33 ' passes first Oscillating lever bearing, the 32 ' back and second bent axle 33 " be connected first bent axle 33 ' and second bent axle 33 " also for being symmetrical set, promptly the angle of inclination is opposite.Second bent axle 33 ' passes second Oscillating lever bearing 32 " after be inserted into crankshaft end cover 333 " in coupling fixing.
First Oscillating lever bearing 32 ' comprise first fork 321 ' and be located at first fork 321 ' below with the fixing clutch shaft bearing outer ring 322 ' of first fork 321 '; Be with first adapter sleeve, 325 ', the first adapter sleeve 325 ' outside first fork 321 ' and be connected to first reciprocating lever 4 ' through first connecting pin 326 '; Second Oscillating lever bearing 32 " comprise second fork 321 " and be located at second fork 321 " below with second fork 321 " fixing second bearing outer ring 322 ' ' second fork 321 " outer second adapter sleeve 325 that is with ", second adapter sleeve 325 " be connected to second reciprocating lever 4 through the second connecting pin (not shown) ".Make first fork 321 ' and second Oscillating lever bearing 32 on the Oscillating lever bearing 32 ' of winning thus " on second fork 321 " do swing in the opposite direction, thereby two reciprocating levers 4 ', 4 " do straight reciprocating motion in the opposite direction.
Embodiment three
In the above embodiments one and embodiment two, reciprocating saw is to be operated under the two-pass state, and the difference of present embodiment is; α angle between the central axis 3221 of bearing outer ring 322 and the central axis 3232 of inner ring hole 3231 is 0; Be bearing outer ring 322 and inner ring hole 3231 coaxial settings, simultaneously, also cancelled the stopper slot that matches with alignment pin on the alignment pin on the main shaft end face and bearing inner race among above-mentioned first embodiment; I.e. this moment, reciprocating saw is operated in the one-stroke state.
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.