CN220497942U - Reciprocating cutting tool - Google Patents

Abstract

The present disclosure provides a reciprocating cutting tool, in which one end of an elastic restoring portion for pushing a saw blade backward is slidably abutted against a reciprocating lever, and the other end is coupled to an inner wall of a housing corresponding to the reciprocating lever. Therefore, when the reciprocating rod reciprocates in the front-rear direction under the action of the cutter lifting structure and the elastic reset part, the elastic reset part is mainly stressed and deformed in the front-rear direction, and the problem that the elastic reset part breaks and fails due to the pivotal movement is avoided.

Description

Reciprocating cutting tool

Technical Field

The present disclosure relates to the field of reciprocating cutting tools, and in particular, to a reciprocating cutting tool.

Background

As a power tool, a reciprocating cutting tool is widely used, and is well known to those skilled in the art, and includes a housing, a motor mounted in the housing, and a saw blade driven by the motor to reciprocate relative to the housing to cut a workpiece. Curve saws, reciprocating saws and the like are all reciprocating cutting tools.

Many jigsaw blades have a blade lifting structure such that the blade is subjected to a blade lifting force which drives it to oscillate, and the jigsaw blade can oscillate slightly in a direction perpendicular to its reciprocating cutting direction, which significantly improves the cutting efficiency. In the prior art, the cutter lifting structure is arranged behind the saw blade, and the saw blade is pushed forward to move forward, but the saw blade can be moved forward excessively due to forward pushing force, as shown in the prior art WO2014192455A1, the elastic reset part is arranged in front of the cutter lifting structure to apply backward force to the saw blade, so that the excessive forward movement of the saw blade is adjusted.

The elastic reset portion includes: the plate spring and the regulating roller arranged at the front end of the plate spring are fixed together through bolts and guide blocks. However, through the research of technical staff, when the saw blade moves back and forth under the interaction of the cutter lifting structure and the elastic reset part, the leaf spring can be caused to pivot around the guide block, so that the leaf spring is tired, the joint of the leaf spring and the guide block is broken, and the adjusting structure is disabled.

Disclosure of Invention

In view of the above, an object of the present disclosure is to provide a reciprocating cutting tool, which can avoid the failure of the elastic restoring portion due to the pivot motion.

In view of the above, the present disclosure provides a reciprocating cutting tool comprising:

a motor disposed in the housing;

the reciprocating mechanism is arranged in the shell and comprises a reciprocating rod driven by a motor to reciprocate along the up-down direction relative to the shell and a saw blade connected with the reciprocating rod;

a blade lifting member provided in the housing, the blade lifting member being driven by the motor to push the saw blade forward;

an elastic reset part arranged in the shell and used for pushing the saw blade backwards;

one end of the elastic reset part is in sliding abutting connection with the reciprocating rod, and the other end of the elastic reset part is matched and connected with the inner wall of the shell corresponding to the reciprocating rod.

As a further improvement of an embodiment of the present disclosure, the range of the included angle between the elastic reset portion and the reciprocating lever is: 80-100 deg.

As a further improvement of an embodiment of the present disclosure, the elastic restoring portion includes an elastic body.

As a further improvement of an embodiment of the present disclosure, the elastic restoring portion further includes a rigid body, one end of the elastic body is coupled to the housing, the other end of the elastic body is coupled to the rigid body, and the rigid body is slidably abutted to the reciprocating lever.

As a further improvement of an embodiment of the present disclosure, a surface of the rigid body, which slidably abuts against the reciprocating lever, is a cambered surface.

As a further improvement of an embodiment of the present disclosure, the rigid body includes a steel ball or a pin.

As a further improvement of an embodiment of the present disclosure, when the rigid body is a pin, the pin extends in the up-down direction, and the number of the elastic bodies is two, and the two elastic bodies are symmetrically arranged along the center of the pin.

As a further improvement of an embodiment of the present disclosure, the elastic restoring portion further includes a housing portion, the housing portion has a housing cavity and an opening communicating with the housing cavity, an end of the housing portion opposite to the opening is coupled with the housing, the elastic body is housed in the housing cavity and is coupled with the rigid body, and at least a part of the rigid body protrudes out of the opening.

As a further improvement of an embodiment of the present disclosure, the housing is provided with a limiting portion, and when the reciprocating rod reciprocates, the limiting portion limits the elastic reset portion, so as to prevent the elastic reset portion from being displaced in an up-down direction.

As a further improvement of an embodiment of the present disclosure, the reciprocating cutting tool further includes a bracket and a bearing, the bracket being fixed on an inner wall of the housing, for supporting an upper end of the reciprocating rod and defining a movement path along which the reciprocating rod reciprocates in an up-down direction; the bearing is used for supporting the lower end of the reciprocating rod; the elastic reset part is arranged between the bracket and the bearing, and the projection of the elastic reset part in the front-rear direction is at least partially overlapped with the projection of the bearing in the front-rear direction.

According to the reciprocating cutting tool, one end of the elastic reset part for pushing the saw blade backwards is in sliding butt joint with the reciprocating rod, and the other end of the elastic reset part is in matching joint with the inner wall of the shell corresponding to the reciprocating rod. Therefore, when the reciprocating rod reciprocates in the front-rear direction under the action of the cutter lifting structure and the elastic reset part, the elastic reset part is mainly stressed and deformed in the front-rear direction, and the problem that the elastic reset part breaks and fails due to the pivotal movement is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained from these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a cross-sectional view of a reciprocating cutting tool provided in accordance with one embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of a drive train of a reciprocating cutting tool according to one embodiment of the present disclosure;

FIG. 3 is an enlarged view of the portion of FIG. 1A;

fig. 4 is a schematic structural view of an elastic restoring portion of a reciprocating cutting tool according to another embodiment of the present disclosure abutting against a reciprocating lever.

Reference numerals:

100-reciprocating cutting tool/jig saw;

1-a housing; 101-a fuselage housing; 102-a housing;

2-an electric motor;

3-a main shaft;

4-pinion;

5-a large gear;

6-a first support shaft;

7-eccentric wheel;

8-a second support shaft;

9-a slider;

10-a bracket;

11-a reciprocating mechanism;

12-balancing weight;

13-a knife lifting structure; 131-a fork; 132—push pins; 133-a knife lifting plate; 134-a roller;

14-an elastic reset portion; 141-an elastic member; 142-rigid part; 143-a housing part;

1431-a receiving cavity; 1432-opening; 1433-through holes;

15-a limiting part;

16-bearing.

Detailed Description

For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments described in detail below and to the accompanying drawings.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be taken in a general sense as understood by those having ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "inner", "outer" and the like are used only to indicate relative positional relationships, which may be changed accordingly when the absolute position of the object to be described is changed.

A preferred embodiment of the reciprocating cutting tool of the present utility model is a jig saw. As shown in fig. 1, in order to clearly describe the jig saw 100 of the present embodiment, when an operator holds the jig saw 100 for working, the extending direction of the saw blade 112 is defined as the up-down direction, that is, the standing direction of the operator is defined as the up-down direction; the operator performs work facing forward, and the direction opposite to the forward is backward; the right and left direction is perpendicular to the front-rear direction and the up-down direction.

Referring to fig. 1, a jig saw 100 according to an embodiment of the present disclosure includes a housing 1, and a power source, preferably a motor 2 in this embodiment, is fixedly disposed in the housing 1. In this embodiment, the housing 1 includes a housing body 101 and a housing 102, and the motor 2 is fixedly disposed in the housing body 101, in an alternative embodiment, the housing 1 may be a single housing, and the specific structure and number of the housing 1 are not specifically limited herein, based on actual requirements. With continued reference to fig. 1 and with reference to fig. 2, the motor 2 is connected to and rotationally drives the spindle 3, one end of the spindle 3 is connected to the motor 2, and a pinion 4 is formed at the other end of the spindle, and the pinion 4 is engaged with the outer peripheral surface of the large gear 5, so that the large gear 5 is driven by the spindle 3 to pivot about its own pivot axis. The gear wheel 5 is equipped with the eccentric wheel 7 the place ahead, and first back shaft 6 runs through gear wheel 5 and eccentric wheel 7 in order to support gear wheel 5 and eccentric wheel 7, and eccentric wheel 7 and gear wheel 5 fixed connection when gear wheel 5 pivots around self, drives eccentric wheel 7 and pivots around self, in this embodiment, eccentric wheel 7 passes through screw fixed connection with gear wheel 5.

Further, with continued reference to fig. 1 and with reference to fig. 2, the slider 9 is mounted at a position eccentric to the rotation center of the eccentric wheel 7 through the second support shaft 8, and the bracket 10 is mounted on the inner wall of the housing 1. The reciprocating mechanism 11 includes a reciprocating bar 111 and a saw blade 112, and the bracket 10 is for supporting an upper end of the reciprocating bar 111 and is capable of defining a movement path in which the reciprocating mechanism 11 reciprocates in an up-down direction.

Specifically, the slider 9 can slide in the up-down direction in the bracket 10, and the slider 9 slides in the up-down direction to drive the reciprocating rod 111 fixed thereto to reciprocate in the up-down direction, thereby driving the saw blade 112 provided at the lower end thereof to perform the reciprocating cutting action. Further, a bearing 16 is provided below the bracket 10, the bearing 16 for supporting the lower end of the reciprocating lever 111.

Further, when the reciprocating lever 111 reciprocates, the jig saw 1 is caused to vibrate excessively, and in this embodiment, the weight 12 is provided to attenuate the vibration. Specifically, as shown in fig. 1 and 2, a weight 12 is provided between the eccentric 7 and the large gear 5, and the first support shaft 6 penetrates and supports the weight 12. When the large gear 5 is pivoted to drive the reciprocating lever 111 to reciprocate in the up-down direction, the weight 12 is moved in the direction opposite to the direction of movement of the reciprocating lever 111, thus counteracting the reaction force generated when the reciprocating lever 111 moves.

With continued reference to fig. 1, in this embodiment, a cutter lifting structure 13 is further provided, where the cutter lifting structure 13 is disposed behind the saw blade 112, and pushes the saw blade 112 forward to move the saw blade 112 forward, so as to improve the cutting efficiency. Specifically, the cutter lifting structure 13 includes a fork 131, a pushing pin 132, a cutter lifting plate 133 and a roller 134; wherein, the shift fork 131 is located below the large gear 5, the first support shaft 6 passes through and supports the shift fork 131, the shift fork 131 is abutted with the pushing pin 132, the pushing pin 132 can slide in the front-rear direction, the knife lifting plate 133 is pivotally fixed on the housing 1 through the pivot 134, and the knife lifting plate 134 has a first arm abutted with the pushing pin 133 and a second arm supporting the roller 135. Specifically, when the motor is operated to drive the large gear 5 to rotate to drive the shift fork 131 to rotate, and then the pushing pin 132 is pushed to slide back and forth to push the cutter lifting plate 133 to pivot around the pivot 134, so that the roller 135 rotates toward the saw blade 112, the roller can rotate along the rear side of the saw blade 112, and the saw blade 112 can be pushed from the rear.

Excessive forward movement is caused when the roller 135 pushes the saw blade 112 forward, and when the blade lifting plate 134 pivots to rotate in a direction away from the saw blade 112, the roller 135 is separated from the saw blade 112, which causes a problem of increased friction between the saw blade 112 and a workpiece, such as wood.

To solve the above-described problem, in the present embodiment, as shown in the drawing, an elastic return portion 14 is provided in front of the reciprocating lever 111, and the elastic return portion 14 is for pushing the saw blade 112 rearward. One end of the elastic restoring portion 112 slidably contacts the reciprocating lever 111, and the other end thereof is coupled to the inner wall of the housing 1 corresponding to the reciprocating lever 111. The elastic reset portion 112 may be in contact with the housing 1 or connected to the housing 1; the connection may include a detachable connection or a fixed connection, such as by a screw fixed connection, or welding, etc. In this embodiment, the elastic restoring portion 112 is preferably in abutment with the housing 1, so as to facilitate installation, and in other embodiments, in order to enhance the stability of the elastic restoring portion 112, the abutment may be a fixed connection, and the manner in which the elastic restoring portion 112 is in abutment with the inner wall of the housing 1 is not specifically limited, as the practical situation is appropriate. In the present embodiment, since one end of the elastic restoring portion 112 slidably abuts against the reciprocating lever 111, the other end is coupled to the inner wall of the housing 1 corresponding to the reciprocating lever 111. In this way, when the reciprocating lever 111 reciprocates in the front-rear direction under the action of the cutter lifting structure 13 and the elastic restoring portion 112, the elastic restoring portion 112 is mainly deformed by force in the front-rear direction, so that the problem of fracture failure of the elastic restoring portion 112 due to the occurrence of the pivot motion is avoided.

Preferably, in the present embodiment, the range of the included angle between the elastic restoring portion 14 and the reciprocating lever 111 is: 80 deg. to 100 deg., i.e. the elastic return portion 14 is substantially perpendicular to the reciprocating lever 111. Thus, when the reciprocating lever 111 reciprocates in the front-rear direction, the elastic restoring portion 14 is substantially deformed only in the front-rear direction, and the problem that the elastic restoring portion 112 breaks and fails due to the pivoting motion is further avoided.

With continued reference to fig. 1, in the present embodiment, the elastic restoring portion 112 is provided between the bracket 10 and the bearing 16, and the projection of the elastic restoring portion 14 in the front-rear direction at least partially overlaps with the projection of the bearing 16 in the front-rear direction. In the present embodiment, the elastic restoring portion 112 is provided by using the space between the bracket 10 and the bearing 16, and the projection of the elastic restoring portion 14 in the front-rear direction and the projection of the bearing 16 in the front-rear direction are at least partially overlapped, so that not only the distance in the up-down direction of the jig saw 100 but also the distance in the front-rear direction of the jig saw 100 can be reduced, and thus the jig saw 100 is compact.

Further, with continued reference to fig. 1 and fig. 3, in this embodiment, the housing 1 is provided with a limiting portion 15, and when the reciprocating rod 111 reciprocates, the limiting portion 15 limits the elastic restoring portion 14, so as to avoid the elastic restoring portion 14 from being displaced in the up-down direction. Specifically, as shown in fig. 3, the limiting portion 15 may be a groove formed on the inner wall of the housing 1, and one end of the elastic restoring portion 14 coupled with the housing 1 is inserted into the groove, and the elastic restoring portion 14 is limited to be displaced in the up-down direction. The limit portion 15 may be at least two ribs protruding from the inner wall of the housing 1, and when the number of the ribs is two, the ribs are symmetrically disposed on the upper and lower sides of the elastic restoring portion 14, and when the number of the ribs is more than two, all the ribs are disposed around the elastic restoring portion 14. In addition, the limiting portion 15 may be an annular plate protruding from the inner wall of the housing 1, and the annular plate forms a receiving cavity, in which the elastic restoring portion 14 is partially received, and the shape of the receiving cavity is adapted to the shape of the elastic restoring portion 14.

With continued reference to fig. 1 and with reference to fig. 3, the elastic restoring portion 14 includes an elastic body 141, and in this embodiment, the elastic body 141 may be a compression spring, and the elastic body 141 is preferably selected to be an equidistant compression spring. In alternative embodiments, the elastic body 141 may be other types of springs, or elastic members made of elastic materials. The present utility model is not limited to the specific examples and is in fact limited thereto.

In addition, in order to reduce friction and improve strength of the elastic restoring portion 14, in this embodiment, the elastic restoring portion 14 further includes a rigid body 142, wherein one end of the elastic body 141 is coupled to the housing 1, the other end is coupled to the rigid body 142, and the rigid body 142 is slidably abutted to the reciprocating lever 111. In this embodiment, the elastic body 141 may be in abutment or connection with the housing 1; the connection may include a detachable connection or a fixed connection, such as by a screw fixed connection, or welding, etc. In this embodiment, one end of the elastic body 141 is preferably in abutment with the housing 1, so that the installation is facilitated. The coupling of one end of the elastic body 141 with the housing 1 may be that the elastic body 141 is directly coupled with the housing 1, or may be that the elastic body is indirectly coupled with the housing 1, which is not particularly limited herein.

With continued reference to fig. 3, in this embodiment, the elastic restoring portion 14 further includes a receiving portion 143, where the receiving portion 143 has a receiving cavity 1431 and an opening 1432 communicating with the receiving cavity 1431, an end of the receiving portion 143 opposite to the opening 1432 is coupled with the housing, the elastic body 141 is received in the receiving cavity 1431 and coupled with the rigid body 142, and at least part of the rigid body 142 protrudes from the opening 1432. In this embodiment, the elastic restoring member 14 is assembled into a whole after the elastic body 141 and the rigid body 142 are accommodated by the accommodating portion 143, so that the assembly is facilitated, and the elastic body 141 and the rigid body 142 can be limited, so that at least displacement of the elastic body 141 and the rigid body 142 in the up-down direction is avoided. Wherein, when the elastic body 141 and the rigid body 142 are assembled into the accommodating portion 143 by using the fixture, the opening 1432 is reduced to avoid the steel ball falling out of the accommodating portion 143 during the assembling process. In addition, in the present embodiment, the accommodating portion 143 is further provided with a through hole 1433, so that, during the process of assembling the elastic body 141 and the rigid body 142 into the accommodating portion 142, air in the accommodating cavity 1431 can be discharged out of the accommodating cavity 1431 through the through hole 1433, so as to avoid the problem that the elastic body 141 and the rigid body 142 cannot be mounted in place due to air accumulation.

As shown in fig. 3, in order to further reduce the friction force between the elastic return portion 14 and the reciprocating lever 111, the surface of the rigid body 142 that slidably abuts against the reciprocating lever 111 is provided as an arc surface. Specifically, the rigid body 142 in this example is a steel ball.

Further, referring to fig. 4, the rigid body 142 may be a pin, which is cylindrical and extends in the up-down direction. When the rigid body 142 is a pin, the contact area between the rigid body 142 and the reciprocating lever 111 can be increased, so that the supporting effect of the elastic restoring member 14 is better. At this time, there may be two elastic bodies 141, and the two elastic bodies 141 are symmetrically disposed along the center of the pin shaft. Thus, the stability of the elastic restoring member 14 is improved.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; combinations of features of the above embodiments or in different embodiments are also possible within the spirit of the present disclosure, and there are many other variations to the different aspects of the embodiments of the present disclosure described above, which are not provided in detail for the sake of brevity.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.

Claims (10)

1. A reciprocating cutting tool comprising:

a housing;

a motor disposed in the housing;

the reciprocating mechanism is arranged in the shell and comprises a reciprocating rod driven by a motor to reciprocate along the up-down direction relative to the shell and a saw blade connected with the reciprocating rod;

a blade lifting member provided in the housing, the blade lifting member being driven by the motor to push the saw blade forward;

an elastic reset part arranged in the shell and used for pushing the saw blade backwards;

the method is characterized in that: one end of the elastic reset part is in sliding abutting connection with the reciprocating rod, and the other end of the elastic reset part is matched and connected with the inner wall of the shell corresponding to the reciprocating rod.

2. The reciprocating cutting tool of claim 1, wherein: the range of the included angle between the elastic reset part and the reciprocating rod is as follows: 80-100 deg.

3. The reciprocating cutting tool of claim 1, wherein: the elastic restoring portion includes an elastic body.

4. A reciprocating cutting tool according to claim 3, wherein: the elastic reset part further comprises a rigid body, one end of the elastic body is matched and connected with the shell, the other end of the elastic body is matched and connected with the rigid body, and the rigid body is in sliding abutting connection with the reciprocating rod.

5. The reciprocating cutting tool according to claim 4, wherein: the surface of the rigid body, which is in sliding contact with the reciprocating rod, is a cambered surface.

6. The reciprocating cutting tool according to claim 4, wherein: the rigid body comprises a steel ball or a pin shaft.

7. The reciprocating cutting tool according to claim 6, wherein: when the rigid body is a pin shaft, the pin shaft extends along the up-down direction, and the number of the elastic bodies is two, and the two elastic bodies are symmetrically arranged along the center of the pin shaft.

8. The reciprocating cutting tool according to claim 4, wherein: the elastic resetting part further comprises a containing part, the containing part is provided with a containing cavity and an opening communicated with the containing cavity, one end of the containing part opposite to the opening is matched and connected with the shell, the elastic body is contained in the containing cavity and is matched and connected with the rigid body, and at least part of the rigid body protrudes out of the opening.

9. The reciprocating cutting tool of claim 1, wherein: the shell is provided with a limiting part, and when the reciprocating rod reciprocates, the limiting part limits the elastic reset part so as to prevent the elastic reset part from displacing in the up-down direction.

10. The reciprocating cutting tool of claim 1, wherein: the reciprocating cutting tool further comprises a bracket and a bearing, wherein the bracket is fixed on the inner wall of the shell and is used for supporting the upper end of the reciprocating rod and limiting a movement path of the reciprocating rod in the up-down direction; the bearing is used for supporting the lower end of the reciprocating rod; the elastic reset part is arranged between the bracket and the bearing, and the projection of the elastic reset part in the front-rear direction is at least partially overlapped with the projection of the bearing in the front-rear direction.