CN102672266B - Multifunctional cutting tool - Google Patents

Abstract

The present invention relates to a kind of multifunctional tool, which comprises a casing, a motor installed in the casing, a switch for turning on the motor, a transmission mechanism driven by the motor, a first rod installed in the casing, a A second rod that is inserted into the casing and driven by the transmission mechanism to reciprocate, the second rod has a reciprocating stroke S, a first cutter, the first cutter includes a first blade mounted on the first rod and mounted on the The second blade on the second rod, the first cutter may be replaced by a second cutter comprising the first saw blade and the second saw blade. Through the above solution, the operator can cut materials with different hardness by using the multifunctional cutter of the present invention, which improves the cutting efficiency.

Description

A multifunctional tool

technical field

The present invention relates to a multifunctional cutting tool.

Background technique

There are various cutting knives on the market. Since these knives can only cut some soft materials such as insulation cotton or silk wool, it will be difficult for some hard materials such as wood or plasterboard. Carry out the cutting operation.

Contents of the invention

The problem to be solved by the invention is to provide a multifunctional cutting tool suitable for cutting materials with different hardness.

In order to solve the above problems, the multifunctional cutting tool provided by the present invention includes a casing, a motor installed in the casing, a switch for turning on the motor, a transmission mechanism driven by the motor, and a first lever installed in the casing. , a second rod installed in the casing and driven by the transmission mechanism to reciprocate, the second rod has a reciprocating stroke S, a first cutter, the first cutter includes a first blade mounted on the first rod And the second blade installed on the second rod, the first cutter can be replaced by the second cutter, the second cutter includes the first saw blade and the second saw blade, the front end of the casing is formed with a first holding part, and the rear of the casing The end is formed with a second gripping portion, the first gripping portion is formed with a first centerline, the second gripping portion is formed with a second centerline, and the transmission mechanism includes a first cylindrical gear, a second cylindrical gear, The large bevel gear, the small bevel gear meshed with the large bevel gear, the first eccentric block and the second eccentric block, the first cylindrical gear is installed on the motor and transmits the rotational power of the motor, the second cylindrical gear and the The first cylindrical gear meshes and transmits the rotational power transmitted through the first cylindrical gear. The large bevel gear has a first end face and a second end face. The first end face is provided with teeth meshing with the small bevel gear. The first eccentric block and The second eccentric block is located on the same side of the second end face, the small bevel gear and the second cylindrical gear are installed on an intermediate shaft, the intermediate shaft defines a central axis, and the central axis is connected to the first The center line is parallel, the small bevel gear transmits the rotational power transmitted through the second cylindrical gear to the large bevel gear, the first end surface and the second end surface are respectively parallel to the central axis, so The first rod is a first rod driven by a transmission mechanism and reciprocating, the first rod has a reciprocating stroke S, the large bevel gear defines a central axis, the first blade and the second The two blades fit together to form a first fitting surface, the first saw blade and the second saw blade fit together to form a second fitting surface, and the fitting surface of the first cutter is aligned with the first center line or The second center line is parallel, the central axis of the large bevel gear is perpendicular to the first fitting surface and the second fitting surface, the first rod has a first end and a second end, so The second rod also has a first end and a second end, the first end of the first rod is connected with the first eccentric block, the second end of the first rod is connected with the first chuck, and the second The first end of the rod is connected to the second eccentric block, the second end of the second rod is connected to the second chuck, and the bonding surface of the second tool is in common with the first centerline or the second centerline. On the surface, the first clamp clamps the first blade or the first saw blade fixedly, and the second clamp clamps the second blade or the second saw blade fixedly.

Through the above solution, the operator can cut materials with different hardness by using the multifunctional cutter of the present invention, which improves the cutting efficiency.

Description of drawings

Fig. 1 is the three-dimensional view of multifunctional cutting tool of the present invention;

Fig. 2 is the internal structural diagram of the multifunctional cutter of the present invention after removing the casing;

Fig. 3 is the internal structural diagram of the multifunctional cutter of the present invention after the casing is removed;

Fig. 4 is a cross-sectional view of the first cutter used by the multifunctional cutter of the present invention;

Fig. 5 is the front view of the first cutting tool used by the multifunctional cutting tool of the present invention;

Fig. 6 is the enlarged view of place B in Fig. 4;

Figure 7 is an enlarged view at D in Figure 4;

Fig. 8 is a cross-sectional view of a second tool used by the multifunctional tool of the present invention;

Fig. 9 is the front view of the second cutting tool used by the multifunctional cutting tool of the present invention;

Figure 10 is an enlarged view at C in Figure 8;

Fig. 11 is the enlarged view of place A in Fig. 9;

Fig. 12 shows the position diagram when the blades of the first cutter of the multifunctional cutter of the present invention overlap;

Fig. 13 has shown the position figure that the blade of the first tool of the multifunctional tool of the present invention is staggered by a reciprocating stroke;

Fig. 14 shows the position diagram when the saw blades of the second cutter of the multifunctional cutter of the present invention overlap;

Fig. 15 shows the position diagram of the saw blade of the second tool of the multifunctional tool of the present invention staggered by a reciprocating stroke;

Fig. 16 shows a schematic diagram of sawing by the multifunctional cutter of the present invention using a second cutter;

Fig. 17 shows the enlarged view of the air outlet in Fig. 1 of the multifunctional tool of the present invention;

Fig. 18 is a sectional view at E-E place among Fig. 17;

Fig. 19 shows the second form of the air outlet of the multifunctional cutter of the present invention;

Fig. 20 shows the third form of the air outlet of the multifunctional cutter of the present invention;

Fig. 21 shows the fourth form of the air outlet of the multifunctional cutter of the present invention;

Detailed ways

As shown in Fig. 1 , the multifunctional cutting tool of the present invention comprises a casing 1, and the casing 1 is formed with a first gripping portion 2 at a front end and a second gripping portion 3 at a rear end, and the first gripping portion 2 has a first central line, The second grip part 3 has a second centerline, the first centerline is parallel to the second centerline, the first centerline and the second centerline are preferably the same centerline X, and a battery pack 5 is installed on the rear end of the grip On the holding part 3, the battery pack 5 has a third centerline Y, the angle between the third centerline Y and the centerline X is between 0° and 90°, preferably an angle of 30°.

As shown in Figures 1, 2 and 3, the motor 6 is installed in the second grip part 3, a first rod 10a installed in the casing 1 and a second rod 10b installed in the casing, in this embodiment , a transmission mechanism is used to convert the rotational motion of the motor 6 into the reverse reciprocating motion of the first rod 10a and the second rod 10b. In addition, the first rod 10a can also be fixedly installed in the casing, and only the second rod 10b is reciprocating, which can also achieve the purpose of the present invention. The transmission mechanism includes a pair of spur gears 7a and 7b, a pair of bevel gears 8a and 8b, and a pair of first eccentric blocks 9a and second eccentric blocks 9b mounted on a gear shaft 9 with a centerline of O and a phase of 180 degrees. The axis of rotation of the first eccentric weight 9a and the second eccentric weight 9b is the center line O of the gear shaft 9. The first eccentric weight 9a and the second eccentric weight 9b are installed on the waist of the first rod 10a and the second rod 10b respectively. In the hole, the middle of the first rod 10a and the second rod 10b is supported by a guide block 11, and the other ends of the first rod 10a and the second rod 10b are respectively equipped with chucks 12a and 12b, and the chucks 12a and 12b are used to clamp The first cutter 100 or the second cutter 200. A switch 4 is installed on the casing 1 for starting the motor 6. When the operator operates the switch 4, the motor 6 is started, and the motor 6 drives the cylindrical gear 7a installed on the output shaft of the motor Rotate, the cylindrical gear 7a drives the cylindrical gear 7b meshed with it to rotate, the other end of the gear shaft of the cylindrical gear 7b is equipped with a bevel gear 8a, the gear shaft 9 of the bevel gear 8b is installed on the casing 1, and the bevel gear 8a drives the bevel gear 8b Rotate, a pair of eccentric blocks 9a, 9b with a phase of 180 degrees on the gear shaft 9 of the bevel gear 8b respectively drive the first rod 10a and the second rod 10b to perform reverse reciprocating motion, and the first cutter or the second cutter is installed to do On the first rod 10a and the second rod 10b that move in opposite directions, the reciprocating movement of the first cutter or the second cutter realizes the sawing function. In addition, the transmission mechanism of the present invention can also be realized in other ways, as long as the rotary motion of the motor can be converted into the reciprocating motion of the tool.

As shown in Figures 4, 5, 6 and 7, the first cutter 100 of the present invention is shown. The first cutter 100 is mainly used for cutting non-hard materials, such as thermal insulation cotton and silk cotton. The first cutter 100 comprises a first blade 100a and a second blade 100b. The rivet 14 passes through the round hole, the bushing 15 and the washer 16 on the second blade 100b in sequence, and is riveted by the other end of the rivet 14, so that the first blade 100a is attached to the second blade 100b, and the bush 15 slides in the waist-shaped hole of the first blade 100a to realize the reciprocating movement between the two blades. For those skilled in the art, there are other connection methods for the two blades to achieve relative reciprocating motion. The first blade 100a is mounted to the chuck 12a, and the second blade 100b is mounted to the chuck 12b. The first blade 100a and the second blade 100b preferably have the same tooth shape, tooth saw and tooth height. In order to achieve high-efficiency cutting, the tooth height of the knife teeth is generally greater than or equal to 5mm, such as 8mm in the present invention. The first blade 100a and the second blade 100b respectively comprise a series of knife teeth, and a series of knife teeth have a first tooth pitch P1 , where the tooth pitch is the distance between a certain adjacent tooth tops on the blade. The area formed between the two adjacent edges of the two blades is the cutting area. The distance between points A and B of the two blades in the figure is the cutting area. In the front view of the two blades, as shown in Figure 5, the cutting area forms a certain opening for The fiber soft material is inserted, and the opening must be large and deep, usually the depth is the tooth height greater than or equal to 5mm, where the tooth height is the distance between the tooth top and tooth bottom of a certain tooth on the blade, in order to ensure the fiber material plugging into the cutting area. Because the insulation cotton and other materials are very soft, you only need to cut them off, and you don’t need to cut off the excess shavings. Therefore, it is more suitable to use the cutting method for the blades. The cutting edges of the two blades face the bonding surface Z1-Z1 of the two blades, that is, the blade edge The mouth angle angle is not greater than 90°, and the shape of the teeth should be as symmetrical as possible, that is, the two blades of one tooth should be equilateral, so as to avoid the tendency of the soft material to fall to one side when the two blades are cutting, and it is easier to cut.

As shown in Figures 8-11, the second cutter 200 of the present invention is shown. The second cutter 200 is mainly used for cutting relatively hard materials, such as wood, gypsum board and other materials. The second cutter 200 includes a first saw blade 200a and a second saw blade 200b, and the first saw blade 200a and the second saw blade 200b are bonded together and connected to each other by the same connection method as the first blade 100a and the second blade 100b. Can move back and forth relative to each other. The first saw blade 200a is mounted to the collet 12a, and the second saw blade 200b is mounted to the collet 12b. The first saw blade 200a and the second saw blade 200b preferably have the same tooth shape, tooth saw and tooth height, and the saw blades 200a and 200b are installed together in reverse, that is, the installed saw blades 200a and 200b are viewed from the front of the saw blade The inclination angle of the sawtooth is opposite, as shown in Figure 9. The first saw blade 200a and the second saw blade 200b respectively include a series of saw teeth, and the series of saw teeth have a second tooth pitch P2, where the tooth pitch is the distance between certain adjacent tooth tops on the saw blade. In order to realize high-efficiency sawing, the tooth height of the sawtooth is generally not greater than 5mm, and the tooth height of the present invention is 3mm. As shown in Figure 11, the direction of the cutting edge of the saw blade is not limited to one side, that is, the cutting edge can face outward or inward, and the tooth shape of the saw blade is asymmetrical. The blades are sawed at the same time, and the chips are removed at the same time, that is, the force exerted on the two saw blades is the same, which is conducive to the balance of the machine. In addition, the teeth of the saw blade have outwardly divided teeth, so that the width of the cut slit is greater than the thickness of the two saw blades, and the saw will not be pinched. In order to ensure the cutting edge is sharp, angle1 and angle2 in Figure 10 are the angles between the same side of the upper tooth of any saw blade and Z2-Z2, the angle angle1 is preferably not less than 90 degrees, and angle2 is not greater than 90 degrees. In order to improve the cutting efficiency, angle1 and angle2 are best separated one by one. When the operator cuts soft materials, the operator installs the first tool on the chuck; when the operator needs to cut hard materials, the operator only needs to replace the second tool, so that it can be used for different working conditions Sawing. Preferably, when the first cutter 100 is installed on the appliance, the bonding surface Z1-Z1 of the first cutter is parallel to the first centerline of the first gripping part 2 or the second centerline of the second gripping part 3, Preferably coplanar; Similarly, when the second cutter 200 is installed on the utensil, the abutment surface Z2-Z2 of the second cutter 200 and the first center line of the first grip part 2 or the first center line of the second grip part 3 The two centerlines are parallel, preferably coplanar. Such a design can ensure that the operator's grip is located within the abutment surface of the first cutter 100 or the second cutter 200 , thereby achieving stable and efficient sawing operations.

In addition, in order to realize efficient shearing and sawing operations through the multi-functional tool, the present invention designs the relationship between the tooth saw and the reciprocating stroke of the first tool and the second tool, and the reciprocating stroke of the multi-functional tool of the present invention is S. As shown in Figure 12-15. Fig. 12 shows that the first blade 100a and the second blade 100b of the first cutter 100 of the present invention are located in the coincident position, the knife tooth crest on the first blade 100a and the knife that cuts together with it on the second blade 100b The offset tooth pitch ΔP1 between the tooth tops, at this time, the teeth on the first blade 100a are preferably aligned with the teeth on the second blade 100b, and the offset tooth pitch is P1 at this time. Fig. 13 shows that the first blade 100a of the first cutting tool 100 of the present invention is located at the maximum distance position from the center line O of the first eccentric block 9a and the second eccentric block 9b rotation center, that is, the center line O of the gear shaft 9, that is, the maximum stroke position; The second blade 100b is located at the minimum distance from the rotation center of the first eccentric mass 9a and the second eccentric mass 9b, ie, the center line O of the gear shaft 9, that is, the minimum stroke position. At this time, the two blades are staggered by a certain distance S, which is the reciprocating stroke. Since the first cutter is mainly used to cut materials with very long, thin, soft, and low density fibers, such as thermal insulation cotton and silk cotton, etc., due to thermal insulation cotton, silk Cotton and other materials are very soft. In a reciprocating process of double-blade cutting, if a tooth on the first blade 100a can be cut with multiple teeth on the second blade 100b, it is easy to make the soft material fiber plugged in the two blades. Between, resulting in appliance stall, blade damage and other consequences. Therefore, the reciprocating stroke S of the multifunctional tool of the present invention is smaller than the sum of the first tooth pitch P1 and the offset tooth pitch P1, that is, 2P1. In addition, when the first blade 100a and the second blade 100b of the first cutter 100 are at the coincident position, if the teeth on the first blade 100a are not aligned with the teeth on the second blade 100b, that is, the teeth on the first blade 100a are not aligned. The tooth distance between the cutter teeth of the second blade 100b and the cutter teeth that cut together with it is ΔP1, and the reciprocating stroke S should be less than P1+ΔP1 at this time, so as to ensure that a certain distance on the first blade 100a within one reciprocating stroke One knife tooth can only cut with one knife tooth of the second blade 100b. Fig. 14 has shown that a pair of first saw blade 200a and the second saw blade 200b of the second cutting tool 200 of the present invention are located at coincident positions, the crests of the sawtooth on the first saw blade 200a and the second saw blade 200b and the The distance between the crests of the sawtooths for common sawing is the offset pitch ΔP2. At this time, the sawtooth on the first saw blade 200a is best aligned with the crest of the sawtooth on the second saw blade 200b. for P2. Fig. 14 shows that the first saw blade 200a of the second cutting tool 200 of the present invention is located at the maximum distance position from the center line O of the first eccentric block 9a and the second eccentric block 9b, that is, the center line O of the gear shaft 9, that is, the maximum stroke position, The second saw blade 200b is located at the minimum distance position from the rotation center of the first eccentric block 9a and the second eccentric block 9b, that is, the center line O of the gear shaft 9, that is, the minimum stroke position, and the two saw blades are staggered by a certain distance S.S. The reciprocating stroke of the multifunctional tool of the present invention. Because the second tool is mainly used for cutting hard materials such as wood and plasterboard, in a reciprocating process of sawing with double saw blades, one sawtooth on the first saw blade 200a can interact with multiple teeth on the second saw blade 200b. The teeth realize sawing, so that more teeth participate in cutting at the same time, which greatly improves the sawing efficiency. Therefore, the reciprocating stroke S of the multifunctional tool of the present invention is set to be greater than the sum of the second pitch P2 and the offset pitch P2, ie 2P2. In addition, when the first saw blade 200a and the second saw blade 200b of the second cutter 200 are located at coincident positions, if the saw teeth on the first saw blade 200a are not aligned with the saw teeth on the second saw blade 200b, that is, the first saw blade 200a The tooth distance between the sawtooth on the blade 200a and the sawtooth on the second saw blade 200b that cuts with it is ΔP2. At this time, the reciprocating stroke S should be greater than P2+ΔP2, so as to ensure that the teeth participating in the cutting within one reciprocating stroke are more than many. Obviously, in order to use two different cutters on this appliance and achieve high sawing efficiency, the following conditions must be met, that is, the sum of the first pitch P1 of the first cutter 100 and the offset pitch ΔP1 should be greater than the first The sum of the second pitch P2 of the second tool 200 and the offset pitch ΔP2, that is, P1+ΔP1>P2+ΔP2.

As shown in Figure 16, when the operator needs to saw relatively hard materials, such as branches L, the operator needs to use the second cutter 200 to be installed on the multifunctional cutter of the present invention, the centerline of the second cutter 200 It is preferably collinear with the first centerline of the first gripping part 2 at the front end. The sawtooth direction of the second cutter 200 is shown in the figure to be installed downwards. below the centerline. Of course, the sawtooth direction of the second cutter 200 can also be installed facing upward according to needs. Although the double saw blade mechanism of the second cutting tool 200 ensures the balance of the utensil during the sawing process, when sawing a long cantilever flexible workpiece such as a branch, the branch may still shake, so a support is needed to hold the branch. In order to ensure that the branches do not shake, thereby improving the sawing efficiency. One or more radial bosses 13 are formed at the front grip part 2 of the appliance, and the radial bosses 13 can be integrally formed with the front grip part 2, or can be installed on the front grip part 2 as a separate part . The radial boss 13 has a front end face 13a and a lower end face 13b located below the first central line. In order to improve the strength of the saw blade, usually the width b of the saw blade should not be too small, generally set at about 18mm. The first grip part 2 at the front end is used for gripping by human hands. If the grip position is too thick or too thin, it will cause uncomfortable grip. The size a of the first grip part 2 at the front end is generally about 46mm. Therefore, the formula for calculating the distance c between the tooth top of the saw blade and the edge of the same side of the first gripping portion 2 at the front end is: c=(a-b)/2=14mm.

There are generally two methods for cutting branches. When the diameter of the branch is small (diameter less than 28mm), it is generally cut with electric scissors. For branches with a diameter greater than 28mm, it usually needs to be sawed. In order to use the multifunctional cutter of the present invention to saw branches with larger diameters, the calculation above shows that the distance c between the toothed side of the blade and the edge of the same side of the first holding position can be used to support the workpiece. Because the value of c is too small, it is impossible to ensure that the appliance can be reliably supported on the workpiece when the diameter of the branch is relatively thick, that is, the appliance can be reliably supported on the workpiece only when the lower edge of the first holding position is lower than the geometric center of the branch, otherwise it cannot Reliable support. If it is obviously inconvenient to hold by increasing the size of the front-end grip part 2, the radial boss 13 provided at the front-end grip part 2 of the present invention has a lower end surface 13b in the direction of the saw blade plane of the second cutter 200, The lower end surface 13b is at least 5 mm higher than the front gripping portion 2 . In addition, in order to adapt to different installation directions of the saw blade, the end face of the radial boss 13 is at least 5 mm higher than the front gripping portion 2 . Thereby, the multifunctional cutter can reliably support and fast saw branches with a diameter larger than 28mm. In addition, if the centerline of the second cutter 200 is located below the first centerline of the front handle grip part 2, in order to ensure stable support, as long as the end surface of the radial boss 13 is at least higher than the teeth of the saw blade of the second cutter 200 The top is 19mm. In addition, the radial boss 13 can be an integral boss, or one or more bosses distributed in the radial direction of the front holding part 2 .

As shown in Figures 1, 2, 17 and 18, an air inlet 18 and an air outlet 19 are formed on the casing 1 of the multifunctional tool, and the fan 17 of the motor 6 is preferably opposite to the air outlet. When the appliance is working, under the action of the fan 17, the wind flows into the casing through the air inlet 18 and is output from the air outlet 19, thereby preventing the motor from overheating. Usually when cutting soft material, the output power of motor 6 is not big, and motor 6 heats up little, and the maximum inscribed circle diameter size H of air outlet 19 is usually relatively small, but because the multifunctional cutting tool of the present invention also can sawing harder material , such as tree branches, the output power of the appliance is large, and the motor 6 is seriously heated. If the maximum inscribed circle diameter H of the air outlet 19 is too small, it will be difficult to effectively dissipate heat from the motor 6, so the air outlet of the fan should be relatively large, so as to meet The appliance works effectively under different working conditions. However, when the multifunctional cutter is used to saw branches, especially when the diameter of the sawed branches W is greater than 7mm, because the branches are hard and old, coupled with the high-speed rotation of the fan, if the air outlet is too large, the branches will probably pass through the outlet. The vents fall into the inside of the case and can damage the fan. In order to solve the heat dissipation problem under different working conditions without damaging the fan, the present invention designs the size of the air outlet of the fan. The maximum inscribed circle diameter H of the air outlet opening must ensure that branches with a diameter of 7mm cannot fall Into the inside of the case, that is, H should be less than 7mm, so as to ensure that the fan will not be damaged. Figure 18 shows that the air outlet is a type of open air outlet directly opening holes on the surface of the casing. Figures 19 and 20 show another form of air outlet. A curved air outlet is formed on the casing, that is, a labyrinth vent. Figure 21 shows that a mesh 19 is installed at the air outlet, that is, a mesh air outlet Form, wherein the opening of the mesh 19 should not be easily pierced by foreign objects, so as to better prevent debris such as branches from falling into the casing and destroying the fan. Equally, air inlet 18 is also preferably the same size and form as air outlet 19.

As shown in Figure 1, this appliance is designed with a front and rear handle structure. When the user is performing a shearing operation, because the workpiece is soft and the shearing force is small, the appliance is relatively balanced. The operator can use the rear grip part 3 When the user is performing the sawing operation, because the workpiece is hard and the sawing force is relatively large, and when sawing flexible workpieces such as branches, the balance of the appliance is relatively poor, the operator can hold the front The holding part 2 is used for operation, so as to ensure that the appliance works relatively as smoothly as possible. In addition, it can also be operated with both hands, so as to realize stable and reliable sawing. On the other hand, by arranging the switch 4 between the front grip part 2 and the rear grip part 3, it is ensured that the operator can operate the switch 4 with the same hand while holding the front grip part 2 with one hand. , the same hand can also operate the switch 4 when holding the rear grip part 3 with one hand. In this way, the operator can operate the appliance with one hand, which greatly improves the work efficiency. In addition, since the multifunctional tool of the present invention uses the second tool for sawing, since the workpiece is relatively hard, the required sawing force is also relatively large. In order to ensure that the multifunctional tool of the present invention can efficiently realize sawing and shearing For the function, the nominal voltage of the battery pack 5 of the present invention is at least 3.6 volts, preferably 10.8 volts. The battery pack 5 preferably uses a lithium battery pack, a nickel-cadmium battery pack or a supercapacitor.

The above description and the drawings shown are only some specific implementations of the present invention, and the protection scope of the present invention is mainly based on the claims. Based on the understanding of the above description and accompanying drawings, it is considered within the protection scope of the present invention that those skilled in the art simply replace some components in the same way or in the form of simple replacement. .

Claims (2)

1. a multifunctional cutter, comprise a casing, one is arranged on the motor in casing, the switch of a unlatching motor, one by motor-driven transmission mechanism, one is installed to the first bar in casing, one is installed in casing and is driven the second bar moved reciprocatingly by transmission mechanism, it is S that described second bar has a reciprocating stroke, first cutter, described first cutter comprises the first blade be installed on the first bar and the second blade be installed on described second bar, it is characterized in that, described first cutter can be replaced by the second cutter, described second cutter comprises the first saw blade and the second saw blade, described casing front end is formed with the first grip portions, described casing rear end is formed with the second grip portions, described first grip portions is formed with the first center line, described second grip portions is formed with the second center line, described transmission mechanism comprises the first roller gear, second roller gear, bevel gear wheel, the bevel pinion engaged with described bevel gear wheel, first eccentric block and the second eccentric block, described first roller gear to be arranged on motor and to transmit the rotary power of motor, described second roller gear engages with described first roller gear and transmits the rotary power transmitted via described first roller gear, described bevel gear wheel has the first end face and the second end face, described first end face is provided with the tooth engaged with described bevel pinion, described first eccentric block and described second eccentric block are positioned at the homonymy of described second end face, described bevel pinion and described second roller gear are arranged on a jackshaft, described jackshaft limits a central axis, described central axis and described first centerline parallel, rotary power via described second roller gear transmission is delivered on described bevel gear wheel by described bevel pinion, described first end face, described second end face respectively with described centerline axis parallel, described first bar is one and is driven and the first bar moved reciprocatingly by transmission mechanism, it is S that described first bar has a reciprocating stroke, described bevel gear wheel limits a central axis, described first blade and described second blade formation first bonded to each other binding face, described first saw blade and described second saw blade formation second bonded to each other binding face, the binding face of described first cutter and the first center line or described second centerline parallel, the central axis of described bevel gear wheel is mutually vertical with described second binding face with described first binding face, described first bar has first end and the second end, described second bar also has first end and the second end, the first end of described first bar is connected with the first eccentric block, second end of described first bar is connected with the first chuck, the first end of described second bar is connected with the second eccentric block, second end of described second bar is connected with the second chuck, the binding face of described second cutter and the first center line or described second center line coplanar, first blade or described first saw blade described in described first chuck fixed clamp, second blade or described second saw blade described in described second chuck fixed clamp.

2. multifunctional cutter as claimed in claim 1, it is characterized in that, described blade comprises a series of cutter tooth, and described a series of cutter tooth has the first tooth pitch p1, the offset teeth of described a pair blade is apart from being Δ P1, and described reciprocating stroke is less than described first tooth pitch P1 and offset teeth distance Δ P1 sum.

3. multifunctional cutter as claimed in claim 2, is characterized in that, described offset teeth equals the first tooth pitch P1 apart from Δ P1, and described reciprocating stroke S is less than 2P1.

4. multifunctional cutter as claimed in claim 3, it is characterized in that, the height of described cutter tooth is greater than 5mm.

5. multifunctional cutter as claimed in claim 1, it is characterized in that, described saw blade comprises a series of sawtooth, and described a series of sawtooth has the second tooth pitch P2, the offset teeth of described a pair saw blade is apart from being Δ P2, and described reciprocating stroke S is greater than described second tooth pitch P2 and offset teeth distance Δ P2 sum.

6. multifunctional cutter as claimed in claim 5, is characterized in that, described offset teeth equals the second tooth pitch P2 apart from Δ P2, and described reciprocating stroke S is greater than 2P2.

7. multifunctional cutter as claimed in claim 6, it is characterized in that, the height of described sawtooth is less than or equal to 5mm.

8. multifunctional cutter as claimed in claim 1, it is characterized in that, described blade comprises a series of cutter tooth, described a series of cutter tooth has the first tooth pitch P1, the offset teeth of described a pair blade is apart from being Δ P1, and described saw blade comprises a series of sawtooth, and described a series of sawtooth has the second tooth pitch P2, the offset teeth of described a pair saw blade is apart from being Δ P2, and described second tooth pitch P2 and offset teeth are less than described first tooth pitch P1 and offset teeth distance Δ P1 sum apart from Δ P2 sum.

9. multifunctional cutter as claimed in claim 8, it is characterized in that, the height of described sawtooth is less than or equal to 5mm, and the height of described cutter tooth is greater than 5mm.

10. multifunctional cutter as claimed in claim 1, it is characterized in that, described casing front end is formed with the first grip portions, and form projection in described first office, grip part, described projection is higher than the first grip portions at least 5mm.

11. multifunctional cutters as claimed in claim 10, it is characterized in that, described projection is at least one radial protrusion.

12. multifunctional cutters as claimed in claim 11, it is characterized in that, described radial protrusion has a front end face, and described casing front end is formed with a front end face, the front end face of described radial protrusion and the front end face of casing coplanar.

13. multifunctional cutters as claimed in claim 1, it is characterized in that, described casing front end is formed with the first grip portions, projection is formed in described first office, grip part, described projection has a lower surface on the saw blade in-plane of the second cutter, and the distance of described lower surface distance saw blade tooth top is at least 19mm.

14. multifunctional cutters as claimed in claim 13, it is characterized in that, described projection is at least one radial protrusion.

15. multifunctional cutters as claimed in claim 14, it is characterized in that, described radial protrusion has a front end face, and described casing front end is formed with a front end face, the front end face of described radial protrusion and the front end face of casing coplanar.

16. multifunctional cutters as claimed in claim 1, it is characterized in that, described switch is between described first grip portions and described second grip portions.

17. multifunctional cutters as claimed in claim 1, it is characterized in that, described motor is positioned at described second grip portions.

18. multifunctional cutters as claimed in claim 17, it is characterized in that, described multifunctional cutter also comprises the power brick of a drive motors, and described power brick is connected to described second grip portions.

19. multifunctional cutters as claimed in claim 18, is characterized in that, described power brick forms the 3rd center line, and described 3rd center line and the described first or second center line are at an angle.

20. multifunctional cutters as claimed in claim 19, it is characterized in that, described angle is between 0 degree to 90 degree.

21. multifunctional cutters as claimed in claim 20, is characterized in that, the angle ranging from 30 degree.

22. multifunctional cutters as claimed in claim 1, it is characterized in that, described casing is also provided with the power brick of a drive motors, the nominal voltage of described power brick is at least 3.6 volts.

23. multifunctional cutters as claimed in claim 22, is characterized in that, the nominal voltage of described power brick is 10.8 volts.

24. multifunctional cutters as claimed in claim 23, it is characterized in that, described casing front end is formed with the first grip portions, described casing rear end is formed with the second grip portions, described first grip portions is formed with the first center line, described second grip portions is formed with the second center line, described first centerline parallel and described second center line.

25. multifunctional cutters as claimed in claim 24, it is characterized in that, described power brick is connected to described second grip portions and is formed with the 3rd center line, described 3rd center line and the described first or second center line are at an angle.

26. multifunctional cutters as claimed in claim 25, is characterized in that, the angle ranging between 0 degree to 90 degree.

27. multifunctional cutters as claimed in claim 26, is characterized in that, the angle ranging from 30 degree.

28. multifunctional cutters as claimed in claim 1, it is characterized in that, described casing is formed with an air port, the maximum inscribed circle diameter in described air port is less than 7mm.

29. multifunctional cutters as claimed in claim 28, it is characterized in that, described air port is air outlet.

30. multifunctional cutters as claimed in claim 29, it is characterized in that, described air outlet is open type air outlet.

31. multifunctional cutters as claimed in claim 29, it is characterized in that, described air outlet is labyrinth type air outlet.

32. multifunctional cutters as claimed in claim 29, is characterized in that, described air outlet is net formula air outlet.