Swing saw head and swing saw

Abstract

The utility model discloses a swing saw machine head and a swing saw, and relates to the technical field of medical apparatus and instruments, the swing saw machine head comprises an input mechanism, an output mechanism and a control mechanism, the input mechanism comprises a cam with a convex part, and the cam is rotatable; the shifting fork is arranged at one end of the input mechanism and is in transmission connection with the cam; the rolling mechanism is arranged on the shifting fork and can rotate, the rolling mechanism is provided with a rolling surface, the cam rotates to enable the rolling surface to abut against the protruding part, and the protruding part drives the rolling mechanism to rotate to enable the shifting fork to move in a reciprocating mode; the rotating axis of the rolling mechanism is parallel to the rotating axis of the cam. According to the technical scheme provided by the utility model, the abrasion of the cam of the swing saw head is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a oscillating saw head and an oscillating saw. Background Technology

[0002] An oscillating saw is a commonly used surgical instrument, generally consisting of an oscillating saw head and a saw blade assembly. The oscillating saw head drives one end of the saw blade assembly and provides reciprocating rotational power output, causing the saw blade assembly to oscillate back and forth around the end connected to the oscillating saw head to achieve the sawing function.

[0003] A typical oscillating saw head includes a cam and a shift fork. One end of the shift fork is a sleeve with a rotation center, and the other end is a swing arm. The swing arm of the shift fork abuts against the outer circumferential surface of the cam. As the cam rotates, the swing arm of the shift fork swings back and forth around the rotation center of the sleeve, driving the sleeve to rotate back and forth, thereby providing the power output for the reciprocating rotation.

[0004] However, the cam of this type of oscillating saw head is prone to wear and has a short service life. Utility Model Content

[0005] The main purpose of this utility model is to provide a oscillating saw head and oscillating saw, which aims to reduce the wear of the cam of the oscillating saw head.

[0006] To achieve the above objectives, the oscillating saw head proposed in this utility model includes:

[0007] An input mechanism, the input mechanism including a cam having a protrusion, the cam being rotatable;

[0008] A shift fork, located at one end of the input mechanism and connected to the cam drive; and

[0009] A rolling mechanism is provided on the shift fork and is rotatable. The rolling mechanism has a rolling surface. The cam rotates to make the rolling surface abut against the protrusion. The protrusion drives the rolling mechanism to rotate so that the shift fork reciprocates.

[0010] The rotation axis of the rolling mechanism is parallel to the rotation axis of the cam.

[0011] In one embodiment, the rolling mechanism includes:

[0012] A pin assembly, disposed on the shift fork, wherein the axis of the pin assembly is parallel to the rotation axis of the cam; and

[0013] A rolling element is rotatably fitted onto the pin assembly and coaxially arranged with the pin assembly, and the outer peripheral surface of the rolling element forms the rolling surface.

[0014] In one embodiment, the rolling element is one of a roller, a bearing, or a ball.

[0015] In one embodiment, the shift fork is provided with a mounting groove, the mounting groove having opposing first and second sidewalls along the axis of the pin assembly, the pin assembly connecting the first and second sidewalls, and the rolling element being at least partially disposed within the mounting groove.

[0016] In one embodiment, the pin assembly includes:

[0017] The pin includes a first shaft segment and a second shaft segment that are coaxial. The diameter of the first shaft segment is smaller than the diameter of the second shaft segment. The first shaft segment passes through the first sidewall, and the second shaft segment extends into the mounting groove.

[0018] A bushing includes a coaxial first bushing segment and a second bushing segment, wherein either the diameter of the second bushing segment or the outer diameter of the second bushing segment is larger than the outer diameter of the first bushing segment. The first bushing segment abuts against the second bushing segment, and the second bushing segment abuts against a second sidewall. The rolling element is sleeved outside the first bushing segment.

[0019] A screw is inserted through the bushing, one end of which is connected to the second shaft segment, and the other end of which is connected to the second sidewall.

[0020] In one embodiment, the fork includes:

[0021] The sleeve portion is provided with a swing center; and

[0022] The swing arm has one end connected to the sleeve and the other end extending to one side of the outer circumferential surface of the cam. The rolling mechanism is rotatably located at the end of the swing arm away from the sleeve. Through the rotation of the cam, the swing arm drives the sleeve to swing back and forth around the swing center.

[0023] In one embodiment, the swing arm includes:

[0024] A first straight segment, one end of which is connected to the sleeve portion, and the other end of which extends toward the cam; and

[0025] The second straight segment is located at the end of the first straight segment away from the sleeve portion and is spaced apart from the outer peripheral surface of the cam.

[0026] In one embodiment, the outer periphery of the cam is provided with three protrusions, the protrusions are equally spaced along the circumference of the cam, a transition portion is provided between two adjacent protrusions, and the protrusions and the transition portions are alternately arranged along the circumference of the cam.

[0027] Two swing arms are arranged opposite each other, and a cam is located between the two swing arms. A rolling mechanism is provided for each swing arm. When one swing arm is close to the protrusion, the other swing arm is close to the transition part.

[0028] In one embodiment, the input mechanism further includes an input shaft that drives the cam to rotate; and / or,

[0029] The oscillating saw head also includes an output shaft, which passes through the sleeve portion and rotates synchronously with the sleeve portion. The output shaft is used to drive the connected saw blade assembly; and / or

[0030] The oscillating saw head also includes a housing, which has a receiving space, and the cam, the shift fork, and the rolling mechanism are all located within the receiving space.

[0031] This utility model also proposes a swing saw, comprising:

[0032] The aforementioned oscillating saw head; and

[0033] A saw blade assembly, wherein the fork is driven to connect to the saw blade assembly to cause the saw blade assembly to reciprocate.

[0034] The oscillating saw head of this utility model includes a cam, a shift fork, and a rolling mechanism. The cam has a continuously changing diameter. Through the continuous rotation of the cam, the outer circumferential surface of the cam drives the shift fork to reciprocate. The rolling mechanism is located between the cam and the shift fork. The shift fork contacts the outer circumferential surface of the cam through the rolling mechanism. Since the rotation axis of the rolling mechanism is parallel to the rotation axis of the cam, rolling friction occurs between the rolling mechanism and the outer circumferential surface of the cam. The frictional force of rolling friction is much smaller than that of sliding friction, which greatly reduces the frictional force on both the cam and the rolling mechanism, thereby reducing friction and wear, extending the service life of the oscillating saw head, and improving the operational stability of the oscillating saw head during long-term use. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 A cross-sectional view of an embodiment of the oscillating saw head provided by this utility model;

[0037] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0038] Figure 3 A cross-sectional view of a portion of the structure of the oscillating saw head provided by this utility model;

[0039] Figure 4 An exploded view of a portion of the structure of the oscillating saw head provided by this utility model;

[0040] Figure 5 A schematic diagram of the cam structure of the oscillating saw head provided by this utility model.

[0041] Explanation of icon numbers:

[0042] 100. Cam; 110. Protrusion; 120. Transition section;

[0043] 200, shift fork; 210, sleeve section; 220, swing arm section; 221, first straight section; 222, second straight section; 2221, mounting groove;

[0044] 300, Rolling mechanism; 310, Pin assembly; 311, Pin; 3111, First shaft section; 3112, Second shaft section; 312, Bushing; 3121, First bushing section; 3122, Second bushing section; 313, Screw; 320, Rolling element; 321, Bearing;

[0045] 400. Input axis;

[0046] 500, Output shaft;

[0047] 600. Shell.

[0048] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection, a direct connection or an indirect connection through an intermediate medium, or a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0053] This utility model proposes a swing saw head.

[0054] Please see Figures 1 to 2 , Figure 1 This is a cross-sectional view of an embodiment of the oscillating saw head provided by this utility model. Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0055] In one embodiment of this utility model, the oscillating saw head includes:

[0056] The input mechanism includes a cam 100 having a protrusion 110, and the cam 100 is rotatable;

[0057] The shift fork 200 is located at one end of the input mechanism and is drively connected to the cam 100; and

[0058] A rolling mechanism 300 is provided on the shift fork 200 and is rotatable. The rolling mechanism 300 is provided with a rolling surface. The cam 100 rotates to make the rolling surface abut against the protrusion 110. The protrusion 110 drives the rolling mechanism 300 to rotate so that the shift fork 200 moves back and forth.

[0059] The rotation axis of the rolling mechanism 300 is parallel to the rotation axis of the cam 100.

[0060] The oscillating saw head of this utility model includes a cam 100, a shift fork 200, and a rolling mechanism 300. The cam 100 has a continuously varying diameter. Through the continuous rotation of the cam 100, the outer peripheral surface of the cam 100 drives the shift fork 200 to reciprocate. The rolling mechanism 300 is disposed between the cam 100 and the shift fork 200. The shift fork 200 contacts the outer peripheral surface of the cam 100 through the rolling mechanism 300. Since the rotation axis of the rolling mechanism 300 is parallel to the rotation axis of the cam 100, rolling friction occurs between the rolling mechanism 300 and the outer peripheral surface of the cam 100. The frictional force of rolling friction is much smaller than that of sliding friction, which greatly reduces the frictional force on both the cam 100 and the rolling mechanism 300, thereby reducing friction and wear, extending the service life of the oscillating saw head, and improving the operational stability of the oscillating saw head during long-term use.

[0061] The cam 100 has at least one protrusion 110 on its outer periphery, giving it a continuously varying diameter. This allows the rolling mechanism 300 to reciprocate via the outer periphery of the cam 100, which in turn drives the shift fork 200 to reciprocate. The more protrusions 110 there are, the more times the cam 100 rotates and drives the shift fork 200 to reciprocate, resulting in faster oscillation of the saw blade assembly and higher sawing efficiency.

[0062] In one embodiment, the rolling mechanism 300 includes:

[0063] A pin assembly 310 is disposed on the shift fork 200, and the axis of the pin assembly 310 is parallel to the rotation axis of the cam 100; and

[0064] The rolling element 320 is rotatably sleeved on the pin assembly 310 and coaxially arranged with the pin assembly 310, and the outer peripheral surface of the rolling element 320 forms a rolling surface.

[0065] Reference Figures 1 to 2 In this embodiment of the invention, the rolling mechanism 300 includes a pin assembly 310 and a rolling element 320. The axis of the pin assembly 310 is parallel to the rotation axis of the cam 100. The pin assembly 310 provides support for the installation and rotation of the rolling element 320. The rolling element 320 is rotatably mounted on the pin assembly 310 to achieve rolling motion. The structure is simple and easy to implement. In addition, it is relatively easy to set the axis of the pin assembly 310 to be parallel to the rotation axis of the cam 100, reducing the assembly difficulty of the rolling mechanism 300.

[0066] In one embodiment, the rolling element 320 is one of a roller, a bearing 321, or a ball.

[0067] In embodiments of this invention, the rolling element 320 can be a roller, which makes line or surface contact with the outer peripheral surface of the cam 100, resulting in low friction and high load-bearing capacity. The rolling element 320 can also be a bearing 321, offering low friction and high precision. Alternatively, the rolling element 320 can be a ball, which makes point contact with the outer peripheral surface of the cam 100, reducing friction and wear. Specifically, in this embodiment, the rolling element 320 uses a bearing 321, which is convenient to select and readily available.

[0068] In one embodiment, the shift fork 200 is provided with a mounting groove 2221, and the mounting groove 2221 is provided with a first sidewall and a second sidewall along the axis of the pin assembly 310. The pin assembly 310 connects the first sidewall and the second sidewall, and the rolling element 320 is at least partially disposed in the mounting groove 2221.

[0069] Reference Figure 2 In this embodiment of the invention, a mounting groove 2221 is provided on the shift fork 200. The mounting groove 2221 is used to accommodate the rolling mechanism 300. The mounting groove 2221 has opposing first and second sidewalls in the axial direction of the pin assembly 310. The pin assembly 310 is disposed inside the mounting groove 2221 and connects the first and second sidewalls. The rolling element 320 can partially extend out of the mounting groove 2221 to contact the outer peripheral surface of the cam 100, or the rolling element 320 can be completely contained within the mounting groove 2221. The cam 100 partially extends into the mounting groove 2221 to contact the rolling element 320. By placing the rolling mechanism 300 inside the mounting groove 2221, the structure of the oscillating saw head is made more compact, and the stability of the rolling mechanism 300 is improved, thereby ensuring the reliability of the swing angle of the shift fork 200.

[0070] Combination Figure 1 and Figure 4 In the embodiments of this utility model, the mounting groove 2221 and the rolling mechanism 300 are provided in a one-to-one correspondence. Specifically, the shift fork 200 has two swing arm portions 220. Each swing arm portion 220 is provided with a mounting groove 2221 at one end near the cam 100. Each mounting groove 2221 is provided with a set of rolling mechanisms 300 to ensure that each contact position between the shift fork 200 and the cam 100 is reduced in friction and wear through the rolling mechanism 300.

[0071] In one embodiment, the pin assembly 310 includes:

[0072] The pin 311 includes a coaxial first shaft section 3111 and a second shaft section 3112. The diameter of the first shaft section 3111 is smaller than the diameter of the second shaft section 3112. The first shaft section 3111 passes through the first sidewall, and the second shaft section 3112 extends into the mounting groove 2221.

[0073] The bushing 312 includes a coaxial first bushing segment 3121 and a second bushing segment 3122. Either the diameter of the second bushing segment 3112 or the outer diameter of the second bushing segment 3122 is larger than the outer diameter of the first bushing segment 3121. The first bushing segment 3121 abuts against the second bushing segment 3112, and the second bushing segment 3122 abuts against a second sidewall. A rolling element 320 is sleeved on the outside of the first bushing segment 3121.

[0074] Screw 313 is inserted through bushing 312. One end of screw 313 is connected to the second shaft segment 3112, and the other end of screw 313 is connected to the second sidewall.

[0075] Reference Figure 3 In an embodiment of this utility model, the pin assembly 310 includes a pin 311, a bushing 312, and a screw 313. The pin 311 includes a first shaft segment 3111 and a second shaft segment 3112 that are coaxial and connected. The bushing 312 includes a first bushing segment 3121 and a second bushing segment 3122 that are coaxial and connected. During assembly, the first shaft segment 3111 is first threadedly connected to the first side wall, so that the pin 311 is fixed inside the mounting groove 2221. Then, the bearing 321 is sleeved on the outside of the first bushing segment 3121 of the bushing 312. Then, the bushing 312 is installed between the pin 311 and the second side wall. Finally, the screw 313 passes through the second side wall and the bushing 312 and is threadedly connected to the second shaft segment 3112 of the pin 311. The bearing 321 is axially limited by the second shaft section 3112 and the second bushing section 3122, reducing the possibility of axial movement of the bearing 321 and improving the rolling stability of the bearing 321, thereby further reducing the wear of the cam 100. In addition, by dividing the pin assembly 310 into pin 311, bushing 312 and screw 313 for segmented assembly, the problem of the rolling mechanism 300 being unable to be installed inside the receiving groove is avoided, and the assembly difficulty of the rolling mechanism 300 is reduced.

[0076] In one embodiment, the shift fork 200 includes:

[0077] The sleeve portion 210 is provided with a swing center; and

[0078] The swing arm 220 has one end connected to the sleeve 210 and the other end extended to one side of the outer peripheral surface of the cam 100. The rolling mechanism 300 is rotatably located at the end of the swing arm 220 away from the sleeve 210. Through the rotation of the cam 100, the swing arm 220 drives the sleeve 210 to swing back and forth around the swing center.

[0079] Reference Figure 4In an embodiment of this utility model, the shift fork 200 includes a sleeve portion 210 and a swing arm portion 220. The sleeve portion 210 is used to connect the saw blade assembly. One end of the swing arm portion 220 is connected to the sleeve portion 210, and the other end extends toward the outer peripheral surface of the cam 100. The rolling mechanism 300 is disposed at the end of the swing arm portion 220 away from the sleeve portion 210. When the cam 100 rotates, the protrusion 110 and the transition portion 120 on the cam 100 drive the rolling mechanism 300 to float up and down, thereby causing the end of the swing arm portion 220 away from the sleeve portion 210 to float up and down, which in turn causes the entire shift fork 200 to swing back and forth around the swing center, thereby driving the saw blade assembly to swing back and forth.

[0080] In one embodiment, the swing arm portion 220 includes:

[0081] A first straight segment 221, one end of which is connected to the sleeve portion 210, and the other end of which extends toward the cam 100; and

[0082] The second straight segment 222 is located at the end of the first straight segment 221 away from the sleeve portion 210 and is spaced apart from the outer peripheral surface of the cam 100.

[0083] Reference Figure 4 In this embodiment of the invention, the swing arm 220 includes a first straight segment 221 and a second straight segment 222. The first straight segment 221 is connected to the sleeve 210, and the second straight segment 222 is located at the end of the first straight segment 221 away from the sleeve. The mounting groove 2221 and the rolling mechanism 300 are both located on the second straight segment 222. By setting the first straight segment 221 and the second straight segment 222 to extend in a straight line, the shape of the shift fork 200 is made more regular, which facilitates the design and calculation of the swing angle of the swing arm 220, so that the rotation angle of the sleeve 210 meets the usage requirements. In particular, in this embodiment, the shift fork 200 has two swing arms 220. The included angle and length of the two swing arms 220 and the outer diameter of the cam 100 need to be designed in coordination. The first straight segment 221 and the second straight segment 222 extending in a straight line help to reduce the design difficulty and facilitate the processing and manufacturing of the swing arm 220. The specific included angle and length of the two swing arms 220 can be designed as needed to meet the functional requirements, and are not limited here.

[0084] In one embodiment, the outer periphery of the cam 100 is provided with three protrusions 110, the protrusions 110 are equally spaced along the circumference of the cam 100, and a transition portion 120 is provided between two adjacent protrusions 110. The protrusions 110 and the transition portion 120 are alternately arranged along the circumference of the cam 100.

[0085] Two swing arm portions 220 are arranged opposite each other, and a cam 100 is located between the two swing arm portions 220. A rolling mechanism 300 is provided for each swing arm portion 220. When one swing arm portion 220 is close to the protrusion 110, the other swing arm portion 220 is close to the transition portion 120.

[0086] Combination Figure 1 , Figure 4 and Figure 5 In this embodiment of the invention, the shift fork 200 has two opposing rocker arm portions 220, and the cam 100 is disposed between the two rocker arm portions 220. The projected profile of the cam 100 in the direction of its own rotation axis is the profile line of the cam 100. The distance between any two parallel tangents on the profile line of the cam 100 is equal to the distance between the two rolling mechanisms 300 on the two rocker arm portions 220, so as to ensure that the outer peripheral surface of the cam 100 is always in contact with the rolling surfaces of the two bearings 321 during the rotation of the cam 100. Specifically, in this embodiment, the cam 100 has three protrusions 110, and the transition portion 120 is between two adjacent protrusions 110. As the cam 100 rotates, when the protrusions 110 approach one of the rocker arm portions 220, the transition portion 120 will approach the other rocker arm portion 220.

[0087] In one embodiment, the oscillating saw head further includes an input shaft 400, which drives a connected cam 100 to rotate; and / or,

[0088] The oscillating saw head also includes an output shaft 500, which passes through the sleeve portion 210 and rotates synchronously with the sleeve portion 210. The output shaft 500 is used to drive the connected saw blade assembly; and / or,

[0089] The oscillating saw head also includes a housing 600, which has a receiving space, and the cam 100, the shift fork 200 and the rolling mechanism 300 are all located in the receiving space.

[0090] Reference Figure 1 In an embodiment of this utility model, the input mechanism further includes an input shaft 400, which can be a separately designed shaft or a motor shaft. A cam 100 is sleeved on the outside of the input shaft 400, and a corresponding flat rectangular structure is provided between the input shaft 400 and the cam 100, so that the input shaft 400 drives the cam 100 to rotate, thereby realizing the rotation of the cam 100.

[0091] Reference Figure 1In an embodiment of this utility model, the swing saw mechanism further includes an output shaft 500, which is used to connect one end of the saw blade assembly. The sleeve portion 210 of the fork 200 is sleeved on the outside of the output shaft 500. A corresponding flat square structure is provided between the sleeve portion 210 and the output shaft 500, so that the sleeve portion 210 drives the output shaft 500 to rotate back and forth, thereby causing the saw blade assembly to swing back and forth.

[0092] Reference Figure 1 In the embodiments of this utility model, the oscillating saw head also includes a housing 600, and the cam 100, shift fork 200 and rolling mechanism 300 are all housed in the housing space of the housing 600. The housing 600 plays a protective role, preventing water, dust and other contaminants from the external environment from polluting the internal parts, extending the service life of the oscillating saw head, and also making it convenient for users to hold, reducing the possibility of accidental injury to users from moving parts.

[0093] This utility model also proposes a swing saw, comprising:

[0094] The aforementioned oscillating saw head; and

[0095] The saw blade assembly is driven by the shift fork 200, which is connected to the saw blade assembly to make the saw blade assembly reciprocate.

[0096] The specific structure of the oscillating saw head is as described in the above embodiments. Since this oscillating saw adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here. One end of the saw blade assembly is the connecting end, and the other end is the sawing end. The output shaft 500 of the oscillating saw head is connected to the connecting end of the saw blade assembly. The reciprocating rotation of the output shaft 500 drives the entire saw blade assembly to reciprocate around the axis of the output shaft 500, thus causing the sawing end of the saw blade assembly to oscillate back and forth, thereby realizing the sawing function.

[0097] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A swing saw head, characterized in that, The input mechanism comprises a cam with a protrusion, the cam being rotatable; a shift fork arranged at one end of the input mechanism and in driving connection with the cam; and a rolling mechanism arranged at the shift fork and rotatable, the rolling mechanism being provided with a rolling surface, the cam being rotated to make the rolling surface abut against the protrusion, the rolling mechanism being driven to rotate by the protrusion to make the shift fork reciprocate; wherein the rotation axis of the rolling mechanism is parallel to the rotation axis of the cam. The rolling mechanism comprises: a pin shaft assembly arranged at the shift fork, the rotation axis of the pin shaft assembly being parallel to the rotation axis of the cam; and 2. Swing saw head according to claim 1, characterized in that a rolling member rotatably sleeved on the pin shaft assembly and coaxially arranged with the pin shaft assembly, the outer circumferential surface of the rolling member forming the rolling surface. The rolling member is one of a roller, a bearing and a ball. The shift fork is provided with a mounting groove, the mounting groove being provided with opposite first and second side walls along the axis of the pin shaft assembly, the pin shaft assembly connecting the first and second side walls, and the rolling member being at least partially arranged in the mounting groove.

3. Swing saw head according to claim 2, characterized in that The pin shaft assembly comprises:

4. Swing saw head according to claim 2, characterized in that a pin shaft comprising coaxial first and second shaft segments, the diameter of the first shaft segment being smaller than the diameter of the second shaft segment, the first shaft segment penetrating into the first side wall, and the second shaft segment extending into the mounting groove; 5. Swing saw head according to claim 4, characterized in that a shaft sleeve comprising coaxial first and second shaft sleeve segments, any one of the diameter of the second shaft segment and the outer diameter of the second shaft sleeve segment being larger than the outer diameter of the first shaft sleeve segment, the first shaft sleeve segment abutting against the second shaft segment, the second shaft sleeve segment abutting against the second side wall, and the rolling member being sleeved on the outside of the first shaft sleeve segment; and a screw penetrating through the shaft sleeve, one end of the screw being connected with the second shaft segment, and the other end of the screw being connected with the second side wall. The shift fork comprises: a sleeve portion provided with a swing center; and 6. Swing saw head according to claim 1, characterized in that an oscillating arm portion, one end of the oscillating arm portion being connected with the sleeve portion, the other end of the oscillating arm portion extending to one side of the outer circumferential surface of the cam, and the rolling mechanism being arranged at the end of the oscillating arm portion away from the sleeve portion, the oscillating arm portion driving the sleeve portion to reciprocate around the swing center through the rotation of the cam. The oscillating arm portion comprises: a first straight segment, one end of the first straight segment being connected with the sleeve portion, and the other end of the first straight segment extending towards the cam; and 7. Swing saw head according to claim 6, characterized in that a second straight segment arranged at the end of the first straight segment away from the sleeve portion and spaced apart from the outer circumferential surface of the cam. The outer circumferential surface of the cam is provided with three protrusions, the protrusions being equally spaced apart along the circumferential surface of the cam, a transition portion being arranged between any two adjacent protrusions, and the protrusions and the transition portions being alternately arranged along the circumferential surface of the cam; two oscillating arm portions are arranged in opposition, the cam being arranged between the two oscillating arm portions, one rolling mechanism being arranged corresponding to each oscillating arm portion, one of the oscillating arm portions being close to the protrusion, and the other oscillating arm portion being close to the transition portion.

8. Swing saw head according to claim 6, characterized in that ​ ​ 9. Swing saw head according to any of claims 6 to 8, characterized in that The input mechanism further comprises an input shaft, which is drivingly connected to the cam to drive the cam to rotate; and / or, The swing saw head further comprises an output shaft, which is arranged in the sleeve portion and rotates synchronously with the sleeve portion, and is used to drivingly connect a saw blade assembly; and / or, The swing saw head further comprises a housing, which is provided with a receiving space, and the cam, the shift fork and the rolling mechanism are arranged in the receiving space.

10. A swing saw characterized by, The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The swing saw head according to any one of claims 1 to 9; and The shift fork drivingly connects the saw blade assembly to make the saw blade assembly reciprocate. The swing saw head comprises: The

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