Transmission mechanism of double-saw-blade handheld cutting machine and double-saw-blade handheld cutting machine applying transmission mechanism

Abstract

The transmission mechanism comprises a driving gear which is controlled to rotate, a first driven gear and a second driven gear are distributed on the outer side of the driving gear and meshed with the outer side of the driving gear, eccentric shafts are arranged on the first driven gear and the second driven gear respectively, and the eccentric shafts are meshed with the first driven gear and the second driven gear respectively. One end of a first connecting rod is installed on the eccentric shaft on the first driven gear through a second bearing, the other end of the first connecting rod is rotationally connected with a first reciprocating rod, one end of a second connecting rod is installed on the eccentric shaft on the second driven gear through a second bearing, the other end of the second connecting rod is rotationally connected with a second reciprocating rod, and the first reciprocating rod and the second reciprocating rod are parallel and linearly arranged in a guiding mode. The two sets of connecting rods and reciprocating rods are independently arranged on the two sides of the driving gear, the lateral meshing acting force of the two driven gears acting on the driving gear can be offset to a certain degree in the operation process, and the probability that the driving gear shakes and teeth are damaged due to the fact that the driving gear bears the too large lateral acting force is reduced or eliminated. Operation is smoother and more stable, noise is low, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting tool technical field, concretely relates to double saw blade hand -held cutting machine transmission mechanism and the double saw blade hand -held cutting machine of using it. BACKGROUND

[0002] Electric reciprocating cutting saw is a kind of commonly used electric tool, it carries out cutting to workpiece through the alternate reciprocating movement of two mutually adhered saw blades, and is usually used for cutting soft material such as foam, sponge, rock wool and rubber.

[0003] At present, the transmission structure of this kind of electric reciprocating cutting machine mostly adopts double eccentric shaft transmission mechanism, the double eccentric shaft has two eccentric wheels arranged at 180 °, one reciprocating rod is arranged on each eccentric wheel, and the reciprocating rod and the eccentric wheel are matched by waist-shaped hole, with the rotation of the double eccentric shaft, the reciprocating rod alternately reciprocates linearly, to drive the two saw blades to alternately reciprocate sawing movement. Although this double eccentric shaft transmission mechanism is relatively simple in structure, there is obvious friction phenomenon between the eccentric wheel and the waist-shaped hole, and after using for a period of time, the matching gap between the eccentric wheel and the waist-shaped hole increases, which easily leads to the decrease of sawing efficiency of the saw blade, and the transmission stability becomes poor, and the vibration and noise problems are significant.

[0004] In order to overcome the problem that the transmission stability of the above-mentioned double eccentric shaft transmission mechanism becomes poor, vibration and noise increase after using for a period of time, the transmission mechanism using crankshaft to drive double connecting rod movement appears on the market, that is, one end of the double connecting rod is rotatably installed on the crankshaft, the other end of the double connecting rod is rotatably installed with reciprocating rod, and the end of the reciprocating rod away from the connecting rod is installed with saw blade. The double saw blade cutting machine transmission mechanism using crankshaft to drive double connecting rod movement realizes the reciprocating drive of two saw blades by using crankshaft connecting rod mechanism, which solves the problem that the transmission stability of the double saw blade cutting machine decreases, vibration and noise gradually increase after using for a period of time to a certain extent. However, the transmission mechanism using crankshaft to drive double connecting rod movement has the following problems in the process of use: one end of the double connecting rod is rotatably installed on the crankshaft, and in the process of eccentric rotation movement of the double connecting rod during cutting operation of the cutting machine, lateral tension is generated on the crankshaft and the driving assembly (such as gear) for driving the rotation movement of the crankshaft, so that the crankshaft and the driving assembly for driving the rotation movement of the crankshaft are easy to shake and loosen inside the head seat of the cutting machine, which also easily leads to the damage of the driving assembly, and seriously affects the service life of the driving assembly. Therefore, the utility model provides double saw blade hand -held cutting machine transmission mechanism and the double saw blade hand -held cutting machine of using it, in order to solve the above technical problems. SUMMARY

[0005] The utility model discloses a purpose at, overcome the defect in the prior art, provide double saw blade hand -held cutting machine transmission mechanism and the double saw blade hand -held cutting machine of applying it, utilize gear transmission mechanism to realize the reciprocating drive of saw blade on reciprocating rod no. One and reciprocating rod no. Two, driven gear no. One and driven gear no. Two distribute and engage in the outside of driving gear, namely, two groups of connecting rods and reciprocating rod are relatively independent and set up in the both sides of driving gear, make transmission mechanism run more smoothly, stable, low noise, driven gear no. One and driven gear no. Two distribute and engage in the outside of driving gear, and the lateral meshing force of driven gear no. One and driven gear no. Two on driving gear can be mutually counteracted to a certain extent when transmission mechanism runs, thereby ensuring that the driving gear is stably installed inside the head, reduces or eliminates the probability that the driving gear is shaken and causes tooth damage due to excessive lateral force, helps to greatly improve the service life of the driving gear.

[0006] One of the purposes of the utility model is to design a double saw blade hand -held cutting machine transmission mechanism, which is arranged in the head of the double saw blade hand -held cutting machine, comprising a driving gear in controlled rotary motion, and driven gear no. One, driven gear no. Two, connecting rod no. One, connecting rod no. Two, reciprocating rod no. One and reciprocating rod no. Two, the driven gear no. One and driven gear no. Two distribute and engage in the outside of the driving gear, and one end surface of driven gear no. One and one end surface of driven gear no. Two are fixedly provided with eccentric shafts respectively, one end of the connecting rod no. One is installed on the eccentric shaft on driven gear no. One through bearing no. Two, the other end of the connecting rod no. One is rotatably connected with reciprocating rod no. One, one end of the connecting rod no. Two is installed on the eccentric shaft on driven gear no. Two through bearing no. Two, the other end of the connecting rod no. Two is rotatably connected with reciprocating rod no. Two, and the reciprocating rod no. One and reciprocating rod no. Two are arranged in parallel and linearly guided.

[0007] The utility model discloses a double saw blade hand -held cutting machine transmission mechanism, utilize gear transmission mechanism to realize the reciprocating drive of saw blade on reciprocating rod no. One and reciprocating rod no. Two, driven gear no. One and driven gear no. Two distribute and engage in the outside of driving gear, namely, two groups of connecting rods and reciprocating rod are relatively independent and set up in the both sides of driving gear, make transmission mechanism run more smoothly, stable, low noise, driven gear no. One and driven gear no. Two distribute and engage in the outside of driving gear, and the lateral meshing force of driven gear no. One and driven gear no. Two on driving gear can be mutually counteracted to a certain extent when transmission mechanism runs, thereby ensuring that the driving gear is stably installed inside the head, reduces or eliminates the probability that the driving gear is shaken and causes tooth damage due to excessive lateral force, helps to greatly improve the service life of the driving gear.

[0008] The preferred technical scheme is that the driving gear is rotatably installed in the head, and the driving gear is in transmission connection with the driving mechanism.

[0009] The utility model discloses a second purpose, design a double saw blade hand -held cutting machine, including the body, the machine head of being located the front end of body, the transmission mechanism of being located in the machine head and the two saw blades of being installed on the transmission mechanism, transmission mechanism be above-mentioned double saw blade hand -held cutting machine transmission mechanism, the machine body be equipped with the drive motor and control circuit for driving the rotation of driving gear, the machine body be equipped with the switch for controlling drive motor, reciprocating rod one and reciprocating rod two each install a saw blade on, two the saw blade of sticking together, and the saw tooth of two saw blades is located at the same side.

[0010] The utility model discloses a double saw blade hand -held cutting machine, its transmission mechanism adopts above-mentioned double saw blade hand -held cutting machine transmission mechanism, can drive two saw blades alternate reciprocating motion, and transmission is stable and reliable, and transmission mechanism structure design is compact and reasonable, ensures that cutting machine whole design is exquisite, and the operation is flexible and convenient, and the operation is stable, and the vibration noise is little.

[0011] Preferably, the machine head includes a machine head seat and a machine head cover, the machine head seat is fixed to the front end of the machine body, the machine head cover is fixed to the machine head seat by screws, the driving gear is fixed to the output shaft of the drive motor, and the machine head seat and the machine head cover form a cavity, and a reciprocating rod support seat for guiding the reciprocating rod one and the reciprocating rod two is arranged in the cavity.

[0012] Further preferably, the eccentric shaft is fixed to the front end face of the driven gear one or the front end face of the driven gear two, and the eccentric shaft has a threaded hole inside, one end of the connecting rod one away from the reciprocating rod one and one end of the connecting rod two away from the reciprocating rod two are provided with mounting rings, the connecting rod one is sleeved and mounted on the eccentric shaft of the driven gear one through the bearing two embedded in the end mounting ring, and is fixed and locked with the threaded hole of the eccentric shaft of the driven gear one through the locking screw inserted in the bearing two, the connecting rod two is sleeved and mounted on the eccentric shaft of the driven gear two through the bearing two embedded in the end mounting ring, and is fixed and locked with the threaded hole of the eccentric shaft of the driven gear two through the locking screw inserted in the bearing two.

[0013] Further preferred technical solutions also have, the rear end surface of the driven gear one and the rear end surface of the driven gear two are equipped with installation groove, the inside of the installation groove is equipped with bearing one, the bottom of the handpiece seat is equipped with two vertical columns which are located outside the driving gear, the driven gear one is connected and installed on one vertical column through the bearing one installed in the inside of the installation groove, the driven gear two is connected and installed on the other vertical column through the bearing one installed in the installation groove, the driven gear is rotated and installed on the bottom of the handpiece seat, the installation mode is simple, and the stability is good, and it is helpful to improve the assembly efficiency of the double-saw blade handheld cutting machine.

[0014] Further preferred technical solutions also have, the cross section shape of the reciprocating rod support seat is "N" shape, the handpiece cover is also equipped with a notch for installing the saw blade, the open side of the reciprocating rod support seat corresponds to the notch on the handpiece cover, and the handpiece cover is equipped with a pressing plate for closing the notch through a locking nut.

[0015] Further preferred technical solutions also have, the upper end of the saw blade is equipped with a bayonet, the lower ends of the reciprocating rod one and the reciprocating rod two are respectively equipped with a clamping block matched with the bayonet on the corresponding saw blade, and the upper end of the saw blade is clamped on the clamping block on the reciprocating rod one or the reciprocating rod two through the bayonet. The upper end of the saw blade is clamped and limited by the bayonet and the clamping block on the corresponding reciprocating rod, which facilitates power transmission between the reciprocating rod and the saw blade, makes the reciprocating motion of the saw blade stable and efficient, and facilitates replacement of the saw blade, and ensures high efficiency during replacement of the saw blade.

[0016] Further preferred technical solutions also have, the cross section shape of the reciprocating rod support seat is "N" shape, the handpiece cover is also equipped with a notch for installing the saw blade, the open side of the reciprocating rod support seat corresponds to the notch on the handpiece cover, and the handpiece cover is equipped with a pressing plate for closing the notch through a locking nut.

[0017] Further preferred technical solutions also have, the output shaft of the driving motor is also equipped with a fan, and the machine body is also equipped with a wind guide ring located at the outer periphery of the fan; and the tail portion of the machine body is equipped with a power plug interface. The fan can quickly dissipate heat for the cutting machine, so that the temperature of the internal electronic components does not become too high, which helps to improve the working stability and service life of the internal electronic components; the tail portion of the machine body is equipped with a power plug interface, which facilitates external power supply and ensures convenience during use.

[0018] The advantages and beneficial effects of the utility model lie in:

[0019] 1. The transmission mechanism of the double-saw blade handheld cutting machine, which realizes the reciprocating driving of the saw blades on the reciprocating rod one and the reciprocating rod two by means of the gear transmission mechanism, and the driven gears one and two are distributed and meshed on the outer side of the driving gear, that is, the two groups of connecting rods and the reciprocating rods are independently arranged on the two sides of the driving gear, so that the transmission mechanism runs more smoothly, stably and quietly; the driven gears one and two are distributed and meshed on the outer side of the driving gear, and the lateral meshing forces of the driven gears one and two on the driving gear can be mutually offset to a certain extent during the running of the transmission mechanism, so that the stability of the installation of the driving gear in the machine head is ensured, the shaking of the driving gear due to the excessive lateral force and the damage of the teeth are reduced or eliminated, and the service life of the driving gear is greatly improved.

[0020] 2. The double-saw blade handheld cutting machine, wherein the transmission mechanism adopts the above-mentioned double-saw blade handheld cutting machine transmission mechanism, can drive the two saw blades to alternately reciprocate, is stable and reliable in transmission, is compact and reasonable in structural design, ensures that the overall design of the cutting machine is exquisite, and is flexible and convenient to use and operate, and runs stably and has small vibration and noise.

[0021] 3. The driving gear is fixed on the output shaft of the driving motor, and is located in the cavity formed by the machine head base and the machine head cover, so that the overall structural design is reasonable, and the assembly of the transmission mechanism in the machine head is facilitated.

[0022] 4. The connecting rod end is installed on the eccentric shaft corresponding to the driven gear through the bearing two embedded in the installation ring, and is fixed and locked with the corresponding eccentric shaft through the locking screw, so that the installation mode is simple, and the double-saw blade handheld cutting machine of the utility model can be smoothly assembled and implemented.

[0023] 5. The upper end of the saw blade is limited by clamping the clamping block on the corresponding reciprocating rod, so that the power transmission between the reciprocating rod and the saw blade is facilitated, the reciprocating movement of the saw blade is stable and efficient, the replacement of the saw blade is facilitated, and the efficiency during the replacement of the saw blade is ensured.

[0024] 6. The fan can quickly dissipate heat for the cutting machine, so that the temperature of the internal electronic components is not too high, and the working stability and service life of the internal electronic components are improved; the tail of the machine body is provided with a power plug-in interface, so that the external power supply is facilitated, and the convenience during use is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall structure schematic view of the double-saw blade handheld cutting machine of the utility model;

[0026] Figure 2 is the machine head cover split state schematic view of the double-saw blade handheld cutting machine of the utility model;

[0027] Figure 3 is an assembly structure diagram of a transmission mechanism in a double-saw blade handheld cutting machine of the utility model;

[0028] Figure 4 is a split structure diagram of a transmission mechanism in a double-saw blade handheld cutting machine of the utility model;

[0029] Figure 5 is a perspective view of one end of the driven gear one;

[0030] Figure 6 is a perspective view of the other end of the driven gear one.

[0031] In the figure: 1, machine body; 2, switch; 3, machine head base; 4, machine head cover; 5, pressing plate; 6, fixed plate; 7, saw blade guide support rod; 8, saw blade; 9, base; 10, driving motor; 11, driving gear; 12, driven gear one; 13, driven gear two; 14, connecting rod one; 15, connecting rod two; 16, reciprocating rod one; 17, reciprocating rod two; 18, reciprocating rod support seat; 19, fan; 20, clamping block; 3-1, stand; 5-1, locking nut; 8-1, bayonet; A, eccentric shaft; B, threaded hole; C, mounting groove; D, bearing one; E, bearing two; F, locking screw. DETAILED DESCRIPTION

[0032] The specific embodiments of the utility model are further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0033] Example 1

[0034] As Figure 3 and 4The transmission mechanism of the double-saw blade handheld cutting machine is arranged in the head of the double-saw blade handheld cutting machine, and comprises a driving gear 11 in controlled rotary motion, a driven gear one 12, a driven gear two 13, a connecting rod one 14, a connecting rod two 15, a reciprocating rod one 16 and a reciprocating rod two 17, the driven gear one 12 and the driven gear two 13 are distributed and engaged on the outer side of the driving gear 11, an eccentric shaft A is fixedly arranged on one end surface of the driven gear one 12 and one end surface of the driven gear two 13, respectively, one end of the connecting rod one 14 is installed on the eccentric shaft A on the driven gear one 12 through a bearing two E, the other end of the connecting rod one 14 is rotationally connected with the reciprocating rod one 16, one end of the connecting rod two 15 is installed on the eccentric shaft A on the driven gear two 13 through a bearing two E, the other end of the connecting rod two 15 is rotationally connected with the reciprocating rod two 17, and the reciprocating rod one 16 and the reciprocating rod two 17 are arranged in parallel and in linear guidance.

[0035] Preferably, the driving gear 11 is rotationally installed in the head, and the driving gear 11 is in transmission connection with a driving mechanism.

[0036] The transmission mechanism of the double-saw blade handheld cutting machine of the utility model realizes the reciprocating drive of the saw blades on the reciprocating rod one and the reciprocating rod two by the gear transmission mechanism, the driven gear one and the driven gear two are distributed and engaged on the outer side of the driving gear, that is, two connecting rods and reciprocating rods are independently arranged on the two sides of the driving gear, so that the transmission mechanism runs more smoothly, stably and with low noise, the driven gear one and the driven gear two are distributed and engaged on the outer side of the driving gear, the lateral meshing forces of the driven gear one and the driven gear two on the driving gear can be mutually offset to a certain extent during the running of the transmission mechanism, so that the stability of the driving gear in the head is good, the probability of the driving gear shaking and causing tooth damage due to excessive lateral force is reduced or eliminated, and the service life of the driving gear is greatly improved.

[0037] Example 2

[0038] As Figures 1-6As shown, a double-blade hand-held cutting machine comprises a machine body 1, a machine head arranged at the front end of the machine body 1, a transmission mechanism arranged in the machine head, and two saw blades 8 mounted on the transmission mechanism. The transmission mechanism is the double-blade hand-held cutting machine transmission mechanism described in Embodiment 1. The machine body 1 is provided with a driving motor 10 for driving the driving gear 11 to rotate and a control circuit. The machine body 1 is provided with a switch 2 for controlling the driving motor 10. The reciprocating rod one 16 and the reciprocating rod two 17 are each provided with a saw blade 8. The two saw blades 8 are attached together, and the saw teeth of the two saw blades 8 are located on the same side.

[0039] Preferably, the machine head comprises a machine head seat 3 and a machine head cover 4. The machine head seat 3 is fixed at the front end of the machine body 1. The machine head cover 4 is fixed on the machine head seat 3 by screws. The driving gear 11 is fixed on the output shaft of the driving motor 10. The machine head seat 3 and the machine head cover 4 form a cavity. A reciprocating rod support seat 18 for guiding the reciprocating rod one 16 and the reciprocating rod two 17 is arranged in the cavity.

[0040] Further preferably, the eccentric shaft A is fixed on the front end face of the driven gear one 12 or the front end face of the driven gear two 13, and the eccentric shaft A has a threaded hole B inside. The end of the connecting rod one 14 away from the reciprocating rod one 16 and the end of the connecting rod two 15 away from the reciprocating rod two 17 are each provided with a mounting ring. The connecting rod one 14 is sleeved and mounted on the eccentric shaft A of the driven gear one 12 through a bearing two E embedded in the mounting ring at the end of the connecting rod one 14, and is fixed and locked with the threaded hole B of the eccentric shaft A of the driven gear one 12 through a locking screw F inserted into the bearing two E.

[0041] Further preferably, the rear end face of the driven gear one 12 and the rear end face of the driven gear two 13 are each provided with a mounting groove C. The mounting groove C is internally provided with a bearing one D. The bottom of the machine head seat 3 is provided with two vertical columns 3-1 located on the outside of the driving gear 11. The driven gear one 12 is sleeved and mounted on one vertical column 3-1 through the bearing one D mounted in the mounting groove C. The driven gear two 13 is sleeved and mounted on the other vertical column 3-1 through the bearing one D mounted in the mounting groove C.

[0042] Further preferably, the cross-sectional shape of the reciprocating rod support seat 18 is a "N" shape. A notch for mounting the saw blade 8 is arranged on the machine head cover 4. The open side of the reciprocating rod support seat 18 corresponds to the notch on the machine head cover 4. A pressing plate 5 for closing the notch is arranged on the machine head cover 4 through a locking nut 5-1.

[0043] Further preferably, the upper end of the saw blade 8 is provided with a bayonet 8-1, the lower end of the reciprocating rod one 16 and the reciprocating rod two 17 are respectively provided with a clamping block 20 matched with the bayonet 8-1 on the corresponding saw blade 8, and the upper end of the saw blade 8 is clamped on the clamping block 20 of the reciprocating rod one 16 or the reciprocating rod two 17 through the bayonet 8-1.

[0044] Further preferably, the utility model also comprises a fixed plate 6, a saw blade guiding support rod 7 and a base 9, the fixed plate 6 is fixedly arranged below the headstock 3 through screws, the upper end of the saw blade guiding support rod 7 is fixed on the fixed plate 6, and the base 9 is installed at the lower end of the saw blade guiding support rod 7, and the two saw blades 8 are located in the guiding grooves of the saw blade guiding support rod 7.

[0045] Further preferably, the output shaft of the driving motor 10 is also provided with a fan 19, and the machine body 1 is also provided with a wind guide ring located at the periphery of the fan 19; and the tail of the machine body 1 is provided with a power plug interface.

[0046] The utility model discloses a double saw blade hand-held cutting machine, its transmission mechanism adopts the double saw blade hand-held cutting machine transmission mechanism, can drive two saw blades to alternate reciprocating motion, and transmission is stable and reliable, and the compact and reasonable structure design of transmission mechanism ensures that the overall design of cutting machine is exquisite, and it is flexible and convenient to use operation, and it is stable in operation, and the vibration noise is little.

[0047] The above only is the preferred implementation mode of the utility model, and it should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the technical principle of the utility model, can make a number of improvements and refinements, and these improvements and refinements also should be regarded as the protection scope of the utility model.

Claims

1. A transmission mechanism of a dual-blade hand-held cutter, which is provided in a head of a dual-blade hand-held cutter, characterized in that, The application relates to a double-blade hand-held cutting machine transmission mechanism, which comprises a driving gear (11) with controlled rotary motion, a driven gear one (12), a driven gear two (13), a connecting rod one (14), a connecting rod two (15), a reciprocating rod one (16) and a reciprocating rod two (17), the driven gear one (12) and the driven gear two (13) are distributed and engaged on the outer side of the driving gear (11), an eccentric shaft (A) is fixed on one end surface of the driven gear one (12) and one end surface of the driven gear two (13) respectively, one end of the connecting rod one (14) is installed on the eccentric shaft (A) on the driven gear one (12) through a bearing two (E), the other end of the connecting rod one (14) is rotationally connected with the reciprocating rod one (16), one end of the connecting rod two (15) is installed on the eccentric shaft (A) on the driven gear two (13) through the bearing two (E), the other end of the connecting rod two (15) is rotationally connected with the reciprocating rod two (17), the reciprocating rod one (16) and the reciprocating rod two (17) are arranged in parallel and in straight line guidance.

2. A dual blade hand-held cutter drive mechanism as claimed in claim 1, wherein, The driving gear (11) is rotationally installed in a machine head, and the driving gear (11) is in transmission connection with a driving mechanism.

3. A double-blade hand-held cutting machine comprising a machine body (1), a machine head arranged at the front end of the machine body (1), a transmission mechanism arranged in the machine head, and two saw blades (8) mounted on the transmission mechanism, characterized in that, The transmission mechanism is the double-blade hand-held cutting machine transmission mechanism as claimed in claim 1 or 2, a driving motor (10) and a control circuit for driving the driving gear (11) to rotate are arranged in the machine body (1), a switch (2) for controlling the driving motor (10) is arranged on the machine body (1), the reciprocating rod one (16) and the reciprocating rod two (17) are respectively provided with a saw blade (8), the two saw blades (8) are attached together, and the saw teeth of the two saw blades (8) are located on the same side.

4. The dual blade hand-held cutter of claim 3 wherein, The machine head comprises a machine head base (3) and a machine head cover (4), the machine head base (3) is fixed at the front end of the machine body (1), the machine head cover (4) is fixed on the machine head base (3) through screws, the driving gear (11) is fixed on the output shaft of the driving motor (10), and a reciprocating rod support base (18) for guiding the reciprocating rod one (16) and the reciprocating rod two (17) is further arranged in the cavity formed by the machine head base (3) and the machine head cover (4).

5. The dual blade hand-held cutter of claim 4 wherein, The eccentric shaft (A) is fixed on the front end face of the first driven gear (12) or the front end face of the second driven gear (13), and has a threaded hole (B) inside; the first connecting rod (14) and the second connecting rod (15) are provided with mounting rings at the ends away from the reciprocating rods (16 and 17); the first connecting rod (14) is sleeved and mounted on the eccentric shaft (A) of the first driven gear (12) through a bearing (E) embedded in the mounting ring at the end, and is fixed and locked with the threaded hole (B) of the eccentric shaft (A) of the first driven gear (12) through a locking screw (F) inserted into the bearing (E); the second connecting rod (15) is sleeved and mounted on the eccentric shaft (A) of the second driven gear (13) through a bearing (E) embedded in the mounting ring at the end, and is fixed and locked with the threaded hole (B) of the eccentric shaft (A) of the second driven gear (13) through a locking screw (F) inserted into the bearing (E).

6. The double-saw blade hand-held cutter according to claim 5, characterized in that The rear end face of the first driven gear (12) and the rear end face of the second driven gear (13) are provided with mounting grooves (C), and bearings (D) are mounted in the mounting grooves (C); the bottom of the headstock (3) is provided with two upright columns (3-1) located outside the driving gear (11); the first driven gear (12) is sleeved and mounted on one of the upright columns (3-1) through a bearing (D) mounted in the mounting groove (C); the second driven gear (13) is sleeved and mounted on the other upright column (3-1) through a bearing (D) mounted in the mounting groove (C).

7. The double-saw blade hand-held cutter according to claim 6, characterized in that The cross-sectional shape of the reciprocating rod support seat (18) is "N", and the head cover (4) is further provided with a notch for mounting the saw blade (8); the open side of the reciprocating rod support seat (18) corresponds to the notch on the head cover (4), and a pressing plate (5) for closing the notch is provided on the head cover (4) through a locking nut (5-1).

8. The double-saw blade hand-held cutter according to claim 7, characterized in that The upper end of the saw blade (8) is provided with a bayonet (8-1), and the lower ends of the reciprocating rods (16 and 17) are respectively provided with a clamping block (20) matched with the bayonet (8-1) on the corresponding saw blade (8); the upper end of the saw blade (8) is clamped on the clamping block (20) of the reciprocating rod (16 or 17) through the bayonet (8-1).

9. The double-saw blade hand-held cutter according to claim 8, characterized in that Further comprising a fixing plate (6), a saw blade guide support rod (7) and a base (9); the fixing plate (6) is fixed below the headstock (3) through screws; the upper end of the saw blade guide support rod (7) is fixed on the fixing plate (6); the base (9) is mounted on the lower end of the saw blade guide support rod (7); and the two saw blades (8) are located in the guide grooves of the saw blade guide support rod (7).

10. The dual blade hand-held cutter of claim 9 wherein, The output shaft of the driving motor (10) is further provided with a fan (19), and the machine body (1) is further provided with a wind guide ring located outside the fan (19); the tail of the machine body (1) is provided with a power plug interface.

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