Chain saw

Abstract

The utility model provides a chain saw which comprises a shell, a guide plate and a chain, the guide plate extends outwards from the shell, the chain is arranged on the guide plate, the shell comprises a main shell and a side cover, and the guide plate is arranged between the main shell and the side cover. The chain saw further comprises an adjusting device used for tensioning the chain and locking the guide plate, the adjusting device comprises an operating part, a driving assembly and a tensioning assembly, the driving assembly has a combined state matched with the operating part, in the combined state, the operating part drives the driving assembly, the driving assembly drives the tensioning assembly, and the tensioning assembly is driven by the tensioning assembly. The tensioning assembly enables the guide plate to move so as to achieve tensioning of the chain. The driving assembly further has a separation state in which the driving assembly is separated from the operating part, and in the separation state, the driving assembly is separated from the operating part, and the operating part continues to move to lock the guide plate; the main shell is provided with a groove, the tensioning assembly is contained in the groove, the groove is further covered with a cover plate, the cover plate and the groove form a limiting space, and the tensioning assembly is limited in the limiting space to prevent the tensioning assembly from being separated from the groove to cause function failure.

Description

TECHNICAL FIELD

[0001] The present application relates to chain saws, in particular to a chain tensioning structure of a chain saw. BACKGROUND

[0002] A chain saw is a gardening tool that cuts wood or branches by reciprocating movement of a chain. In order to use the chain saw safely and efficiently, the tension of the chain must be maintained at all times, and therefore it is necessary to provide a chain tensioning device. There are generally two ways of tensioning the chain and locking the guide plate of the chain saw on the market: one is to use an external tool for adjustment, which is primitive and inconvenient; the other is to adjust through the adjustment mechanism provided by the chain saw, but it needs to be completed manually in different ways. Such a tensioning process is very complex and inconvenient to operate, and the adjustment mechanism is complex, resulting in high production and maintenance costs.

[0003] Later, some adjustment mechanisms for tensioning the chain and adjustment mechanisms for fastening the guide plate are provided in one part or coaxially arranged on the market. In order to distinguish from these structures, the applicant has developed a new integrated structure to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a kind of chain saw, which can integrate the functions of tensioning chain and locking guide plate on one operating member, thereby facilitating the operator to use and having simple structure.

[0005] To achieve the above object, the utility model discloses a chain saw comprising a housing, a drive system mounted on the housing, a guide plate extending outwardly from the housing, a chain provided on the guide plate and drivable by the drive system, the housing comprising a main housing and a side cover, the guide plate being arranged between the main housing and the side cover.

[0006] The chain saw further comprises an adjusting device for tensioning the chain and locking the guide plate, the adjusting device comprising an operating member, a drive assembly and a tensioning assembly, the drive assembly having a combined state cooperating with the operating member, in the combined state, the operating member drives the drive assembly, the drive assembly drives the tensioning assembly, and the tensioning assembly moves the guide plate to achieve tensioning of the chain; the drive assembly further has a separated state decoupled from the operating member, in the separated state, the drive assembly is decoupled from the operating member, and the operating member continues to move to lock the guide plate.

[0007] The main housing has a groove, the tensioning assembly is accommodated in the groove, and a cover plate is further covered on the groove, the cover plate and the groove form a limiting space, and the tensioning assembly is limited in the limiting space.

[0008] Furthermore, the drive assembly includes a drive member and at least one spring plate, the drive member being used to drive the tensioning assembly, and the operating member driving the drive assembly to move via the spring plate.

[0009] Furthermore, the drive assembly also includes an upper cover, which and the drive component are assembled to form a drive box. The spring is housed in the drive box and has a protrusion that can extend out of the drive box to cooperate with the operating component.

[0010] Furthermore, the operating component is provided with several mounting slots, which are involute-shaped, and the protrusions of the spring piece cooperate with the mounting slots.

[0011] Furthermore, the spring has three pieces, and the number of the mounting slots is greater than the number of springs.

[0012] Furthermore, the drive component has an eccentric wheel that cooperates with the tensioning assembly.

[0013] Furthermore, the tensioning assembly includes a tensioning block and a return spring. One end of the return spring abuts against the tensioning block, and the other end abuts against the inner wall of the groove. The tensioning block is provided with a first protrusion and a second protrusion. The first protrusion is fixedly installed on the guide plate, and the second protrusion passes through the guide plate and cooperates with the eccentric wheel. The rotation of the driving member causes the eccentric wheel to drive the second protrusion to move, thereby driving the tensioning block to move.

[0014] Furthermore, the cover plate confines the return spring within the groove.

[0015] Furthermore, the guide plate has a through hole and an elongated hole, the first protrusion is fixedly connected to the through hole, and the second protrusion passes through the elongated hole.

[0016] Furthermore, a screw is also provided on the main housing, the screw having an external thread, and the operating member having an internal threaded post, the screw passing through the guide plate and assembled to the threaded post of the operating member.

[0017] This utility model also discloses another chainsaw, including a housing, a drive system mounted on the housing, a guide plate extending outward from the housing, and a chain disposed on the guide plate and driven by the drive system. The housing includes a main housing and a side cover, and the guide plate is disposed between the main housing and the side cover.

[0018] The chain saw further comprises an adjusting device for tensioning the chain and locking the guide plate, the adjusting device comprising an operating member, a driving assembly and a tensioning assembly, the driving assembly having a combined state matched with the operating member, in the combined state, the operating member drives the driving assembly, the driving assembly drives the tensioning assembly, and the tensioning assembly moves the guide plate to realize tensioning of the chain; the driving assembly further having a separated state decoupled with the operating member, in the separated state, the driving assembly is decoupled with the operating member, and the operating member continues to move to lock the guide plate.

[0019] The driving assembly comprises a driving member and at least one elastic sheet, the driving member being used to drive the tensioning assembly, and the operating member driving the driving assembly to move through the elastic sheet.

[0020] Advantages:

[0021] The tensioning assembly in the chain saw can be limited in the groove of the main shell by the cover plate, especially the reset spring, to prevent it from being separated from the groove.

[0022] The driving assembly in the chain saw is matched with the operating member through the elastic sheets, to realize driving of the operating member on the driving assembly and decoupling of the driving assembly from the operating member. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the chain saw in the embodiment of the utility model.

[0024] Figure 2 is an exploded schematic view of the adjusting device of the chain saw in the embodiment of the utility model.

[0025] Figure 3 is an exploded schematic view of the adjusting device from another perspective in the embodiment of the utility model.

[0026] Figure 4 is a schematic view of the operating member matched with the elastic sheet in the driving assembly.

[0027] Figure 5 is a schematic view of the driving assembly in the embodiment of the utility model.

[0028] Figure 6 is a schematic view of the tensioning assembly in the embodiment of the utility model.

[0029] Reference signs: chain saw-100; first half shell-101; second half shell-102; groove-104; sprocket-11; cover plate-12; escape hole-121, 122; screw rod-13; side cover-2; round hole-21; long slot-22; recess-20; guide plate-3; long hole-31; through hole-32; chain-4; operating member-5; top wall-51; peripheral wall-52; threaded column-53; recessed space-501; assembly slot-54; driving assembly-6; upper cover-61; mounting slot-611; driving member-62; eccentric wheel-621; elastic sheet-63; hook foot-631; protrusion-632; center hole-601; tensioning assembly-7; tensioning block-71; first protrusion-711; second protrusion-712; return spring-72. DETAILED DESCRIPTION

[0030] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, unless otherwise indicated, like numbers in the different drawings represent similar or analogous elements. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the present application.

[0031] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "first", "second" and like terms in the present application is not meant to denote any order, quantity, or importance, but is merely used to distinguish one element from another. Also, the use of the terms "a" and "an" and the like in the present application are not meant to denote a quantity of one, but rather denote the presence of at least one. The use of the term "plurality" or "a plurality" in the present application indicates two or more. The use of the terms "front", "back", "bottom", and / or "top" in the present application is merely for ease of description and is not intended to denote a positional or spatial orientation. The use of the terms "include", "includes", "including", and / or "comprise", "comprises", "comprising" in the present application is meant to denote the presence of elements or components listed after such terms in the present application, and is not meant to preclude the presence of other elements or components. The use of the terms "connected" and / or "coupled" in the present application is meant to denote either a direct connection or coupling between elements or components, or an indirect connection or coupling between elements or components, and can include electrical connections or couplings, whether direct or indirect. The use of singular forms of "a", "an", and "the" in the present application is intended to include plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

[0032] The present application discloses a chain saw 100, such as Figure 1 and2 As shown, it includes a housing, a power system mounted on the housing, and a guide plate 3 extending outward from the housing. The housing includes a first half-shell 101, a second half-shell 102, and a side cover 2, with the first half-shell 101 and the second half-shell 102 interlocking to form a main housing. The guide plate 3 is disposed between the second half-shell 102 and the side cover 2. A sprocket 11, which can be driven by the power system, is provided on the housing. A chain 4 is sleeved on the sprocket 11, and the chain 4 is also disposed on the guide plate 3. Specifically, one end of the chain 4 is sleeved on the sprocket 11, and the other end is sleeved on the guide plate 3. The power system drives the sprocket 11 to rotate, and the sprocket 11 drives the chain 4 to reciprocate. In this embodiment, the power system includes a motor, a transmission mechanism, and a reduction mechanism, but it should not be limited to these.

[0033] In this embodiment, the longitudinal extension direction of the guide plate 3 is taken as the X-axis, the direction perpendicular to the surface of the guide plate 3 is taken as the Y-axis, and the vertical direction is taken as the Z-axis.

[0034] The chainsaw 100 also includes an adjustment device for tensioning the chain 4 and locking the guide plate 3. This adjustment device includes an operating element 5, a drive assembly 6, and a tensioning assembly 7. The drive assembly 6 has an engaged state with the operating element 5 and a disengaged state. In the engaged state, the operating element 5 drives the drive assembly 6, which in turn drives the tensioning assembly 7, causing the guide plate 3 to move along the X-axis to tension the chain 4. In the disengaged state, the drive assembly 6 disengages from the operating element 5, and the continued movement of the operating element 5 locks the guide plate 3.

[0035] Specifically, such as Figure 2 As shown, in this chainsaw 100, the side cover 2 and the second half-shell 102 together clamp the guide plate 3 to prevent the guide plate 3 from swaying in a direction perpendicular to the guide plate 3 during movement; that is, the side cover 2 restricts the movement of the guide plate 3 in the Y-axis direction. The operating component 5 is located on the outside of the side cover 2 for user operation. The drive assembly 6 is located inside the operating component 5 and between the operating component 5 and the side cover 2, cooperating with the operating component 5.

[0036] The second half-shell 102 is provided with a groove 104, in which the tensioning assembly 7 is installed. To prevent the tensioning assembly 7 from dislodging from the groove 104 and to restrict its movement along the direction perpendicular to the guide plate 3 (i.e., the Y-axis), a cover plate 12 is also fixedly connected to the second half-shell 102. The cover plate 12 covers the groove 104 and forms a limiting space. The tensioning assembly 7 in the chainsaw 100 can be restricted within this limiting space by the cover plate 12. That is, the tensioning assembly 7 is restricted from moving in the Y-axis direction, but can move in the limiting space along the direction parallel to the guide plate 3 (i.e., the X-axis). A screw 13 is also fixedly provided on the second half-shell 102, the screw 13 being close to the groove 104, and the screw 13 having external threads.

[0037] The guide plate 3 is supported at one end on the second half shell 102 and extends outwardly from the second half shell 102 at the other end, and the chain 4 is sleeved on the outer periphery of the guide plate 3. The guide plate 3 is provided at one end close to the sprocket 11 with a long hole 31 extending along the X-axis direction and located at the middle position of the guide plate 3 in the Z-axis direction, and a through hole 32 arranged above or below the long hole 31 at the end close to the sprocket 11.

[0038] The side cover 2 is provided with an opening comprising a circular hole 21 and a long slot 22 extending along the X-axis direction which are in communication with each other.

[0039] The screw rod 13 on the second half shell 102 is assembled with the operating member 5 after passing through the long hole 31 of the guide plate 3 and the circular hole 21 of the side cover 2 in sequence, that is, the operating member 5 can press and fasten the side cover 2 to the second half shell 102 to limit the movement of the guide plate 3 in the Y-axis direction.

[0040] In the embodiment, the operating member 5 is a knob as shown in Figure 2 and 3 The operating member 5 has a top wall 51 and a peripheral wall 52 extending along the Y-axis from the peripheral edge of the top wall 51. The center of the top wall 51 of the operating member 5 is provided with a threaded column 53 with internal threads and forms a through hole. The screw rod 13 on the second half shell 102 extends into the through hole of the operating member 5, and the external threads of the screw rod 13 are matched with the internal threads of the threaded column 53 to lock the side cover 2 to the second half shell 102 by the operating member 5.

[0041] The peripheral wall 52 of the operating member 5 has a concave-convex pattern for the user to hold and rotate. The inner side of the operating member 5 is formed with a recessed space 501 by the top wall 51 and the peripheral wall 52. The threaded column 53 is located in the recessed space 501. The inner side of the operating member 5 is further provided with a plurality of assembly grooves 54, and the inner wall of the assembly groove 54 is configured as an involute. Specifically, as shown in Figure 4 the inner wall of the assembly groove 54 is a smooth arc shape, gradually expands outwardly from the first end to the terminal end and then vertically falls back to the level of the first end. The involute directions of all assembly grooves 54 are consistent.

[0042] The driving assembly 6 is at least partially accommodated in the recessed space 501 and matched with the assembly grooves 54 of the operating member 5. As shown in Figure 3 and 5As shown, the driving assembly 6 comprises an upper cover 61 and a driving piece 62, the upper cover 61 and the driving piece 62 have coaxial center holes 601. The threaded column 53 of the operating piece 5 can pass through the center holes 601 of the upper cover 61 and the driving piece 62, and cooperate with the screw rod 13 of the second half shell 102. The upper cover 61 is closer to the top wall 51 of the operating piece 5, while the driving piece 62 is relatively far away from the top wall 51 of the operating piece 5. The upper cover 61 and the driving piece 62 are assembled to form a driving box. At least one elastic sheet 63 is contained in the driving box. The operating piece 5 drives the driving assembly 6 to move through the elastic sheet 63.

[0043] Specifically, in the embodiment, the driving assembly 6 is combined with the operating piece 5. Figure 4 As shown, the inner wall of the upper cover 61 is provided with at least one mounting groove 611, and the elastic sheet 63 is mounted in the mounting groove 611. The driving piece 62 abuts against the side wall of the mounting groove 611, that is, the driving box 60 formed by the upper cover 61 and the driving piece 62 can limit the movement of the elastic sheet 63 in the Y-axis direction, but the circumference of the driving box 60 is not closed. The elastic sheet 63 is symmetrically designed, and the elastic sheet 63 comprises two hook feet 631 and a protrusion 632 in the middle. The two hook feet 631 of the elastic sheet 63 are respectively placed in the grooves of the mounting groove 611, and the protrusion 632 of the elastic sheet 63 extends out of the upper cover 61, that is, the middle protrusion 632 of the elastic sheet 63 can extend out of the driving box 60 and cooperate with the assembly groove 54 of the operating piece 5.

[0044] Preferably, in the embodiment, the upper cover 61 is provided with three mounting grooves 611, and the elastic sheet 63 can be provided with one, two or three according to the need of the tensioning force.

[0045] The driving piece 62 is provided with an eccentric wheel 621, which is arranged on the outer side of the driving piece 62 and can cooperate with the tensioning assembly 7. When the driving piece 62 rotates, the tensioning assembly 7 can be driven by the eccentric wheel 621,

[0046] In the embodiment, as shown in the figure, Figure 6 As shown, the tensioning assembly 7 comprises a tensioning block 71 and a return spring 72. One end of the return spring 72 abuts against the tensioning block 71, and the other end abuts against the inner wall of the recess 104. Moreover, the cover plate 12 can limit the return spring 72 in the recess 104 to prevent it from coming off the recess 104. The return spring 72 is limited in the limiting space by the cover plate 12 to prevent it from coming off the recess 104.

[0047] The tensioning block 71 is provided with a first protrusion 711 and a second protrusion 712, and preferably, the first protrusion 711 is shorter than the second protrusion 712. The first protrusion 711 and the second protrusion 712 can be integrally formed with the tensioning block 71 or fixedly arranged.

[0048] In combination with the above, Figure 2The first protrusion 711 is fixedly installed in the through hole 32 of the guide plate 3. The second protrusion 712 is sequentially passed through the long hole 31 of the guide plate 3 and the long slot 22 of the side cover 2, and is matched with the eccentric wheel 621 of the driving member 62. The rotation of the driving member 62 drives the eccentric wheel 621 to drive the second protrusion 712 to move, thereby driving the tensioning block 71 to move.

[0049] In order to facilitate the movement of the tensioning block 71, the cover plate 12 is further provided with the avoiding holes 121 and 122 for the first protrusion 711 and the second protrusion 712 to pass through, and the first protrusion 711 and the second protrusion 712 can reciprocate in the avoiding holes 121 and 122, respectively. The cover plate 12 is fixedly covered on the recess 104 of the second half shell 102, and can prevent the tensioning assembly 7 from being separated from the recess 104 of the second half shell 102 in the Y-axis direction, but will not hinder the movement of the tensioning assembly 7 in the X-axis direction.

[0050] Preferably, in order to reduce the size in the Y-axis direction, the side cover 2 is further provided with the recess 20, and the driving assembly 6 is at least partially accommodated in the recess 20.

[0051] In the assembly of the adjusting device, first, the tensioning assembly 7 is placed in the recess 104 of the second half shell 102, and then the cover plate 12 is fixedly assembled to the second half shell 102, so as to enclose the tensioning assembly 7 in the recess 104. Secondly, the guide plate 3 is placed on the cover plate 12, the first protrusion 711 of the tensioning block 71 is fixedly connected to the through hole 32 of the guide plate 3, the second protrusion 712 of the tensioning block 71 is passed through the long hole 31 of the guide plate 3, and the screw rod 13 of the second half shell 102 is passed through the long hole 31 of the guide plate 3. Then, the side cover 2 is placed on the guide plate 3, the screw rod 13 of the second half shell 102 is passed through the round hole 21 of the side cover 2, and the second protrusion 712 of the tensioning block 71 is passed through the long slot 22 of the side cover 2. The upper cover 61, the driving member 62 and the elastic sheet 63 in the driving assembly 6 are assembled to form an integral whole. The part close to the upper cover 61 is accommodated in the recessed space of the operating member 5, so that the protrusion 632 of the elastic sheet 63 can be in contact with the assembly slot 54 of the operating member 5; the part close to the eccentric wheel 621 is accommodated in the recess 20 of the side cover 2, so that the second protrusion 712 can be in contact with the eccentric wheel 621. Finally, the threaded column 53 of the operating member 5 is passed through the center hole 601 of the driving assembly 6 and is assembled with the screw rod 13.

[0052] The adjusting device of the chain saw 100 can integrate the functions of chain 4 tensioning and guide plate 3 fixing, and first realizes tensioning of the chain saw 100 and then realizes fixing of the guide plate 3. The operator holds the circumferential wall 52 of the operating member 5 to rotate the operating member 5, at this time, the driving assembly 6 is in the joint state, the protrusion 632 of the elastic sheet 63 abuts against the assembly groove 54 of the operating member 5, so as to drive the driving assembly 6 to rotate together, so that the eccentric wheel 621 rotates and pushes the second protrusion 712, so that the second protrusion 712 moves along the X axis. The movement of the second protrusion 712 causes the whole tensioning block 71 to move, and since the first protrusion 711 of the tensioning block 71 is fixedly connected with the guide plate 3, the tensioning block 71 drives the guide plate 3 to move along the X axis, so as to realize tensioning of the chain 4.

[0053] When the chain 4 is tensioned, if the operator continues to rotate the operating member 5. At this time, the movement of the tensioning assembly 7 is resisted, when the resistance reaches the peak, the elastic sheet 63 in the driving assembly 6 will be decoupled from the assembly groove 54 of the operating member 5, that is, the elastic sheet 63 jumps from one assembly groove 54 to the adjacent other assembly groove 54, at this time, the driving assembly 6 is in the separated state, the driving assembly 6 no longer rotates together with the operating member 5, the eccentric wheel 621 cannot rotate, so it cannot drive the second protrusion 712 to move, and the chain 4 cannot be tensioned again. In addition, the tensioning force of the chain 4 is related to the number of elastic sheets 63, the more the number, the greater the tensioning force. The operator can set the number of elastic sheets 63 according to the needs.

[0054] At this time, the operator continues to rotate the operating member 5, then only the operating member 5 rotates, so that the threaded column 53 of the operating member 5 is screwed with the threaded rod 13, that is, the operating member 5 is close to the second half shell 102 in the Y axis direction, so as to press the side cover 2 on the second half shell 102, so as to achieve the purpose of locking the guide plate 3.

[0055] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the preferred embodiment has been disclosed as above, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A chain saw, characterized in that The chain saw comprises a housing, a driving system mounted on the housing, a guide plate extending outward from the housing, a chain arranged on the guide plate and driven by the driving system, and the housing comprises a main housing and a side cover, and the guide plate is arranged between the main housing and the side cover; The chain saw further comprises an adjusting device for tensioning the chain and locking the guide plate, the adjusting device comprises an operating member, a driving assembly and a tensioning assembly, the driving assembly has a combined state matched with the operating member, in the combined state, the operating member drives the driving assembly, the driving assembly drives the tensioning assembly, and the tensioning assembly moves the guide plate to realize tensioning of the chain; the driving assembly further has a separated state decoupled from the operating member, in the separated state, the driving assembly is decoupled from the operating member, and the operating member continues to move to lock the guide plate; The main housing has a groove, the tensioning assembly is accommodated in the groove, and a cover plate is further arranged on the groove to form a limiting space with the groove, and the tensioning assembly is limited in the limiting space.

2. The chain saw of claim 1, wherein The driving assembly comprises a driving member and at least one elastic sheet, the driving member is used to drive the tensioning assembly, and the operating member drives the driving assembly to move through the elastic sheet.

3. The chain saw of claim 2, wherein The driving assembly further comprises an upper cover, the upper cover and the driving member are assembled to form a driving box, the elastic sheet is accommodated in the driving box, the elastic sheet has a protrusion, and the protrusion can extend out of the driving box to be matched with the operating member.

4. The chain saw of claim 3, wherein The operating member is provided with a plurality of assembly grooves, the assembly grooves are in the shape of involute, and the protrusion of the elastic sheet is matched with the assembly grooves.

5. The chain saw of claim 4, wherein The number of the assembly grooves is greater than the number of the elastic sheets.

6. The chain saw of claim 2, wherein The driving member has an eccentric wheel matched with the tensioning assembly.

7. The chain saw of claim 6, wherein The tensioning assembly comprises a tensioning block and a return spring, one end of the return spring is abutted to the tensioning block, the other end is abutted to the inner wall of the groove, the tensioning block is provided with a first protrusion and a second protrusion, the first protrusion is fixedly installed to the guide plate, the second protrusion passes through the guide plate and is matched with the eccentric wheel, and the driving member rotates to drive the second protrusion to move, thereby driving the tensioning block to move.

8. The chain saw of claim 7, wherein The guide plate is provided with a through hole and a long hole, the first protrusion is fixedly connected with the through hole, and the second protrusion passes through the long hole.

9. The chain saw of claim 1, wherein The main housing is further provided with a screw rod, the screw rod has external threads, the operating member has a threaded column with internal threads, and the screw rod passes through the guide plate and is assembled to the threaded column of the operating member.

10. A chain saw, characterized in that The chain saw comprises a housing, a driving system mounted on the housing, a guide plate extending outward from the housing, a chain arranged on the guide plate and driven by the driving system, and the housing comprises a main housing and a side cover, and the guide plate is arranged between the main housing and the side cover; The chain saw further comprises an adjusting device for tensioning the chain and locking the guide plate, the adjusting device comprising an operating member, a driving assembly and a tensioning assembly, the driving assembly having a combined state with the operating member, in which the operating member drives the driving assembly, the driving assembly drives the tensioning assembly, and the tensioning assembly moves the guide plate to realize tensioning of the chain; the driving assembly further having a separated state with the operating member, in which the driving assembly is separated from the operating member, and the operating member continues to move to lock the guide plate; The driving assembly comprises a driving member and at least one elastic sheet, the driving member being used to drive the tensioning assembly, and the operating member driving the driving assembly to move through the elastic sheet.

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