Machine tool

Abstract

The application discloses a machine tool, comprising: a base (10); a housing (20); the utility model relates to a machine tool comprising a base (10) and a fine adjustment device attached to the base (10) and configured to be operable by an operator to move relative thereto, the machine tool further comprising: a switching device attached to the housing (20) and configured to be operable by an operator to move relative thereto between a first position and a second position, the fine adjustment device and the switching device respectively comprise a driving part and a driven part which are configured in a way that when the switching device is in the first position, the switching device and the machine shell are jointed, so that the movement of the fine adjustment device drives the switching device and the machine shell to move together in the direction (L); and when the switching device is in the second position, the switching device and the machine shell (20) are disengaged, so that the switching device and the machine shell (20) can move in the direction (L) independently of the fine adjustment device.

Description

Technical Field

[0001] The present application relates to a machine tool, which may specifically be a trimming machine. Background Art

[0002] A machine tool such as a trimmer or a milling machine mainly comprises a base and a housing, the housing being adapted to mount a tool for performing a machining operation on a workpiece placed against the base. In order to adjust the machining depth of the tool when machining the workpiece, it is usually necessary to adjust the height of the housing to which the tool is attached relative to the base. This adjustment usually includes two steps, coarse adjustment and fine adjustment, to obtain the desired accuracy.

[0003] To this end, the machine tool generally includes an adjusting wheel mounted on a base and detachably engaged with the housing. When performing coarse adjustment, the adjusting wheel is disengaged from the housing, and the operator manually operates the housing to move it relative to the base; when switching from coarse adjustment to fine adjustment, the operator first holds the housing and moves it to engage with the adjusting wheel, and then operates the adjusting wheel, which in turn drives the housing to move relative to the base for precise adjustment.

[0004] This switching operation is achieved by the operator moving, for example, rotating the entire housing. However, the housing with the motor installed inside is large in size and weight. Moving the entire housing to achieve the switch is not convenient enough and may also affect the rough adjustment result that has been completed. In addition, it is not convenient to replace the tool. The attachment structure of the housing and the base needs to be designed so that the housing can not only move relative to the base but also rotate relative to the base, so that the locking of the housing to the base is sometimes not stable enough. Utility Model Content

[0005] The object of the present application is to simplify the switching operation between coarse adjustment and fine adjustment by improving the structure of a machine tool.

[0006] The present application provides a machine tool, which includes: a base; a housing, which is configured to attach a tool of the machine tool; and a fine adjustment device, which is attached to the base and configured to be able to be operated by an operator to move relative to the base. The machine tool also includes: a switching device, which is attached to the housing and configured to be able to be operated by an operator to move between a first position and a second position relative to the housing, the fine adjustment device and the switching device respectively include a driving part and a driven part, and the driving part and the driven part are configured to: when the switching device is in the first position, they are engaged so that the movement of the fine adjustment device drives the switching device and the housing to move together in a direction relative to the base, and when the switching device is in the second position, they are disengaged so that the switching device and the housing can move relative to the base in the direction independently of the fine adjustment device.

[0007] In one embodiment, the driving portion is a threaded rod including external threads, and the driven portion includes internal threads configured to engage with the external threads.

[0008] In one embodiment, the base and the casing respectively include a cylindrical seat body wall and a cylindrical side wall, the seat body wall is suitable for receiving at least a portion of the side wall and the switching device and includes a notch portion, and the switching device includes a switching operating portion exposed to the notch portion so as to be able to be operated by an operator.

[0009] In one embodiment, the switching device includes an operating member providing the switching operating portion and including an annular body attached to the housing such that the switching device can rotate relative to the housing between a first position and a second position.

[0010] In one embodiment, the switching operation part is configured as: a protrusion extending from the annular body along the direction toward the base or extending from the annular body transversely to the direction; and / or a portion of the outer peripheral surface of the annular body exposed to the notch portion, wherein the protrusion or the portion includes or does not include uneven features that facilitate operation by an operator.

[0011] In one embodiment, the operating component includes a boss extending from the annular body transversely to the direction, the boss is formed with a long hole extending in the circumferential direction around the central axis of the annular body and penetrating the boss in the direction, and the fastener extends through the long hole into a fastening hole formed on the casing.

[0012] In one embodiment, the fastener is a threaded fastener and the fastening hole is a threaded hole.

[0013] In one embodiment, the operating component further provides the driven portion, which is integrally formed with the annular body or fastened to the annular body.

[0014] In one embodiment, the operating component includes a recessed portion radially recessed inward from the annular body, the recessed portion includes the first engaging portion and the second engaging portion engaged with the threaded rod when the switching device is in the first position and the second position, respectively, the first engaging portion serves as the driven portion, wherein the first engaging portion and the second engaging portion respectively include a first and a second concave surface for engaging the threaded rod, the first and second concave surfaces are directly connected, or the recessed portion also includes a convex transition portion that separates the first engaging portion from the first engaging portion in the circumferential direction.

[0015] In one embodiment, the first engagement portion and the second engagement portion are configured such that the threaded rod prevents the operating member from further rotating when engaged with the threaded rod.

[0016] In one embodiment, the switching device also includes a driven component providing the driven portion, and the driven component is movably attached to the operating component so that: when the operating component is in a first position, the driven portion engages with the driving portion, and when the operating component is moved away from the first position, the driven portion disengages from the driving portion.

[0017] In one embodiment, the driven member moves radially relative to the operating member.

[0018] In one embodiment, the driven component includes a single engaging portion, the engaging portion includes an engaging surface having an internal thread and serving as the driven portion, the driven component also includes a rod portion extending from a surface of the engaging portion opposite to the engaging surface, the annular body includes a through hole allowing the rod portion to pass through, and the switching device also includes: a seat body, which is configured to be fixed to the free end of the rod portion and includes an abutment surface configured to abut the housing; and an elastic element arranged between the seat body and the operating component.

[0019] In one embodiment, the housing includes an outer peripheral surface and a recess formed on the outer peripheral surface, at least one of the side surfaces defining the recess is an inclined surface connected to the outer peripheral surface, and the seat body is configured such that: when the operating component is in a first position, the abutment surface abuts the outer peripheral surface and when the operating component is in a second position, the seat body is at least partially received in the recess.

[0020] In one embodiment, the machine tool is an edge trimmer.

[0021] The machine tool according to the present application includes a base, a housing, a fine adjustment device attached to the base so as to be operated by a user to move relative to the base, and a switching device attached to the housing so as to be operated by a user to switch or move between a first position and a second position relative to the housing. In the first position, the switching device is drivingly engaged with the fine adjustment device so that the user can operate the fine adjustment device to move the switching device and the housing relative to the base to achieve a fine adjustment operation; in the second position, the switching device is non-drivingly engaged with the fine adjustment device or not engaged at all, so that the switching device and the housing can move independently of the fine adjustment device (and thus independently of the base to which the fine adjustment device is attached), and the operator can achieve manual coarse adjustment at this time. With this structure, when switching between coarse adjustment and fine adjustment, the operator only needs to operate the switching device to move, for example, rotate, the switching device between the first position and the second position relative to the housing, without having to operate the entire housing that is relatively bulky and contains the motor. The switching device may include only an annular operating component or may be implemented as an assembly of an operating component and a driven component with a simple structure. The switching device has a simple structure, light weight, and is easy to operate, so it is relatively simple to perform the switching operation, and it is also more convenient to replace the tool attached to the housing. The housing only needs to move relative to the base or only needs to translate in one direction, and the locking of the housing to the base is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other features and advantages of the present application will be understood from the detailed description given with reference to the accompanying drawings. The accompanying drawings are only used to illustrate the principles of the present application and are not necessarily drawn to scale. In order to highlight the key points of the present application, the accompanying drawings do not necessarily illustrate all the details of the machine tool, so the parts not shown in the accompanying drawings may exist in some embodiments, and the parts shown in the accompanying drawings do not necessarily exist in all embodiments.

[0023] Figure 1 is a front view of a machine tool according to a first embodiment of the present application.

[0024] Figure 2 yes Figure 1 Side view of the machine tool.

[0025] Figure 3 yes Figure 1 Exploded view of a machine tool.

[0026] Figure 4 yes Figure 1 An assembled front view of a machine tool housing, a fine-adjusting device and a switching device.

[0027] Figure 5 yes Figure 4 Bottom view with the fine adjustment device removed.

[0028] Figure 6 yes Figure 1An assembly diagram of a base, a fine adjustment device and a switching device of a machine tool, wherein the fine adjustment device and the switching device are in a non-driven engagement position, at which time coarse adjustment can be performed.

[0029] Figure 7 yes Figure 1 An assembly diagram of a base, a fine adjustment device and a switching device of a machine tool, wherein the fine adjustment device and the switching device are in a driving engagement position, at which time fine adjustment can be performed.

[0030] Figure 8 yes Figure 7 A partial enlarged view of the driving engagement between the fine-tuning device and the switching device.

[0031] Fig. 9 It is a perspective view showing the base and fine adjustment device from a roughly top view.

[0032] Fig.10 is an exploded view of a machine tool according to a second embodiment of the present application.

[0033] Fig.11 and 12 Shown in schematic form Fig.10 The machine tool is in a first position and a second position. DETAILED DESCRIPTION

[0034] The principle of the machine tool of the present application will be described in detail below with reference to the accompanying drawings, taking a trimming machine (sometimes also called a milling machine) as an example. The accompanying drawings provide two specific embodiments of the trimming machine as exemplary embodiments of the machine tool. Those skilled in the art should understand that the machine tool of the present application is not limited to the trimming machine, and the trimming machine is not limited to the two specific embodiments shown in the drawings. The scope of protection of the present application is defined by the claims.

[0035] First reference Figure 1-7 The first embodiment is described. The machine tool mainly includes a base 10 and a housing 20, which is configured to be attached to the base 10 so that the housing 20 can be locked to and released from the base 10 and can at least move relative to the base 10 in a direction L when the housing 20 is released from the base 10. In the illustrated example, the housing 20 is designed to be partially inserted into and removed from the base 10. Figure 1 and 2 The orientation shown is the orientation when the machine tool is in use. In this orientation, the direction in which the housing 20 is installed or inserted into the base 10 and thus the direction L along which the housing 20 is removed from the base 10 is the vertical direction or the up-down direction.

[0036] The base 10 may include a bottom plate 12 and a base wall 14 extending from the bottom plate 12 substantially along a direction L. In the illustrated embodiment, the base wall 14 may be substantially cylindrical to receive the inserted portion of the housing 20. The bottom plate 12 may include a through hole 11 (in Figure 3 The work surface 13 may be perpendicular to the through hole 11, and the workpiece to be processed (not shown in the figure) is used to be placed against the work surface 13. The work surface 13 may be the outer surface or bottom surface of the base plate 12 facing away from the housing 20.

[0037] In the direction L, the first end (upper end in the illustrated orientation) of the housing 20 can be attached to the head 25 in any manner known in the art, and the opposite second end (lower end in the illustrated orientation) is configured to be adjustably attached to the base 10. As shown, a button 17 for controlling the on and off of the machine tool is provided on the head 25, and can optionally be provided on the housing 20 or any other convenient position for operation. The housing 20 is mainly configured to accommodate a motor (not shown in the figure), and the output shaft of the motor extends downward from the housing 20 toward the base 10 along the direction L for attaching or mounting a tool (not shown in the figure) of the machine tool. During use, the tool driven by the motor shaft extends through the through hole 11 on the bottom plate 12 of the base 10 to reach the workpiece to be processed placed against the working surface 13 to perform a processing operation. For the machine tool, the adjustment of the housing 20 relative to the base 10 for adjusting the machining depth of the tool on the workpiece is performed along the extension direction of the tool (the same as the direction L shown in the figure), so the housing 20 is attached to the base 10 in a manner that it can move along the direction L. Unless otherwise specified, all movements of the housing 20 relative to the base 10 in this document refer to movements along the direction L.

[0038] The attachment between the housing 20 and the base 10 can be achieved by partially inserting the cylindrical side wall 22 forming the housing 20 into the seat wall 14 of the base 10 and locking the inserted portion of the housing 20 in the seat wall 14 using the locking device 30 .

[0039] The profiles and dimensions of the side wall 22 of the housing 20 and the seat wall 14 of the base 10 are designed so that the lower end portion of the side wall 22 of the housing 20 can be inserted into the seat wall 14 and can move relative to the seat wall 14 in the direction L. In the illustrated embodiment, the side wall 22 of the housing 20 and the seat wall 14 of the base 10 are both cylindrical barrel structures, so the outer diameter of the side wall 22 is smaller than the inner diameter of the seat wall 14. The housing 20 also includes a barrel extension 24 with a reduced outer profile (or outer diameter) extending from the lower end portion of the side wall 22 inserted into the base 10, and the tool is attached to the motor output shaft extending from the housing 20 through this barrel extension 24 to extend toward the bottom plate 12 of the base 10. In the present application, the housing 20 only needs to be able to move relative to the base 10 along the (tool extension) direction L, and can also but does not have to be able to rotate relative to the base 10 (in fact, in the illustrated embodiment, the housing 20 is prohibited from rotating relative to the base 10, which will be described in detail below), so the side wall 22 of the housing 20 does not necessarily have a cylindrical outer surface, and the cross-sectional shape or outer contour of the side wall 22 and the base wall 14 do not necessarily have to be the same.

[0040] The seat wall 14 of the base 10 includes a notch 16 that penetrates the wall thickness perpendicular to the direction L, so as to allow the user to see the extended tool and the through hole 11 on the bottom plate 12, and preferably the operator can see the actual situation of the tool processing the workpiece to be processed. In the direction L, the notch 16 extends upward from the connection between the seat wall 14 and the bottom plate 12 by a part of the size (or height) of the seat wall 14 in the direction L; and in the circumferential direction around the direction L, the notch 16 also extends a part of the seat wall 14.

[0041] In order to change or adjust the penetration or machining depth of the tool when machining on the workpiece, as described above, the housing 20 of the machine tool is configured to be adjustable (e.g., upward and downward) at least relative to the base 10 in the extension direction L of the tool. The locking device 30 is configured to lock the housing 20 relative to the base 10 after the height adjustment of the housing 20 relative to the base 10 and during the machining operation, specifically to lock it inside the base 10.

[0042] According to the illustrated embodiment, the locking device 30 may (but not necessarily) be disposed on the base 10. Specifically, the base wall 14 of the base 10 includes a gap 19 extending from its free edge (the upper edge shown) 15 to the notch portion 16 of the base wall 14, and the gap 19 is defined by the first and second opposite side portions 19a and 19b of the base wall 14. The locking device 30 is disposed across the gap 19 and is configured to have an unlocked state that allows the housing 20 to move relative to the base 10 for height adjustment and a locked state that locks the housing 20 relative to the base 10 and prevents the above-mentioned height adjustment. In the unlocked state, the two side portions 19a and 19b of the base wall 14 that define the gap 19 are in a free state, the gap 19 has an initial (or maximum) gap width, and the housing 20 (the side wall 22 thereof) can move in the base wall 14 along the direction L. In the locked state, the two side portions 19 a and 19 b defining the gap 19 are pulled toward each other to clamp the seat wall 14 onto the side wall 22 of the housing 20 , thereby locking the housing 20 onto the base 10 .

[0043] As an example, the locking device 30 may include first and second lugs 32 and 34 respectively disposed on the two side portions 19a and 19b on both sides of the gap 19, and a locking member 36 configured to cooperate with the first and second lugs 32 and 34 and enable the two to move toward each other to reduce the width of the gap 19. As an exemplary embodiment, the first and second lugs 32 and 34 respectively include first and second holes (not shown in the figure) aligned with each other, and the locking member 36 is a clamping screw passing through the first and second holes. Optionally, the locking device 30 may also include an operating member 38 for operating the locking member 36, and the operating member is, for example, an operating rod offset from the clamping screw. When the operator operates the operating member 38, the locking member 36: can pull the first and second lugs 32 and 34 (and the two side portions 19a and 19b) toward each other to reduce or close the gap 19, thereby locking and fixing the housing 20; or, can push the first and second lugs 32 and 34 (and the two side portions 19a and 19b) away from each other, thereby returning the gap 19 to its initial state, thereby allowing the housing 20 to move relative to the base 10. The locking device 30 of the machine tool of the present application can be replaced by any other device capable of achieving the above functions. In addition, without affecting the strength and rigidity of the machine tool, the notch portion 16 can have any possible shape, not limited to the more aesthetically pleasing curved profile shown in the figure. The size or dimensions of the notch portion 16 can be designed as required.

[0044] The height adjustment of the housing 20 relative to the base 10 includes a coarse adjustment operation and a fine adjustment operation, and a switch needs to be made after the coarse adjustment operation is performed and before the fine adjustment operation is performed. To this end, the machine tool of the present application includes not only a fine adjustment device for performing the fine adjustment operation, but also a switching device for switching between the fine adjustment operation and the coarse adjustment operation. In the first embodiment of the present application, the fine adjustment device is implemented by an adjusting wheel 50, and the switching device mainly includes an operating component 60.

[0045] refer to Figure 3 The adjusting wheel 50 used as a fine adjustment device is arranged in the base 10 and includes a head 52 and a threaded rod 54 extending from the head 52, wherein the outer contour or outer diameter of the head 52 is greater than the outer contour or outer diameter of the threaded rod 54. An opening 51 is formed on the base body wall 14 of the base 10, and a part of the head 52 is exposed to the opening 51 or preferably extends to the outside through the opening 51, so that the operator can easily reach and operate (see Figure 1 , 2 and 8). Therefore, the exposed portion of the head 52 is used as a fine adjustment operating portion of the fine adjustment device for the operator to operate. A guide hole (not shown in the figure) coaxial with the central axis of the threaded rod 54 is formed on the end surface 53 of the head 52 away from the threaded rod 54, which is used to receive the guide column 57 ( Figure 3 The adjusting wheel 50 is mounted on the base 10 in such a way that the guide post 57 extends into the guide hole, so that the operator can operate (specifically rotate) the fine adjustment operation portion (head 52) of the adjusting wheel 50 to rotate the adjusting wheel 50 around the central axis of the guide post or the threaded rod 54. In addition, a groove 56 ( Figure 6-9 ), the size of the groove 56 is set so that when the adjustment wheel 50 is attached to the base 10: the entire threaded rod 54 can be received in the direction L, and a portion of the cross section of the threaded rod 54 is received in the cross section perpendicular to the direction L. In other words, the threaded rod 54 is partially received in the groove 56 in the cross section perpendicular to the direction L, and as will be explained below, the portion of the threaded rod 54 not received by the groove 56 is used to engage the switching device (specifically the recessed portion 65 of the operating member 60) and the housing 20 (specifically the notch 29 of the housing 20). The groove 56 can have a smooth inner surface and can have any suitable cross-sectional shape, circular or oval, etc.

[0046] In this embodiment, the operating member 60 of the switching device includes a body 62 in the form of an annular side wall. The size of the body 62 is designed so that its outer contour size or outer diameter is substantially equal to the outer contour size or outer diameter of the side wall 22 of the housing 20. Accordingly, the side wall 22 of the housing 20 includes a section 26 with a reduced outer diameter. The cylindrical outer surface of the section 26 is complementary to the cylindrical inner surface of the body 62, so that the operating member 60 can be mounted thereon and rotated around it. The operating member 60 includes a switching operating portion exposed to the notch 16 for the operator to touch and operate. The switching operating portion can be a portion of the outer circumference of the body 62 exposed in the notch 16, and any possible features for increasing the friction between the outer circumference and the operator's hand to facilitate the operator to operate the operating member 60 can be provided thereon, including, but not limited to, any form of uneven features and / or layers or pieces of additional rubber. The uneven features can be any regular or irregular texture features and roughening features, such as grooves, ribs, pits and / or convex points similar to those on the seat wall 14, etc. As an alternative or in addition, the switching operation portion may include a protrusion extending from the body 62 in any direction. In the illustrated embodiment, the switching operation portion is a protrusion 64 ( Figure 1 , 2 and 4), which is configured to be exposed in its notch 16 when the housing 20 is installed in (the seat wall of) the base 10 together with the attached operating component 60, so that the operator can touch and operate the operating component 60 to rotate it relative to the housing 20. The switching operating part can be formed integrally with the body 62, or it can be a separate component of any form that is formed separately and then attached or fixed to the body 62.

[0047] The operating member 60 includes attachment features for attaching to the housing 20. As shown, the operating member 60 includes a boss 66 that protrudes inwardly from the body 62. Figure 3 and 5-7. The boss 66 can, but is not necessarily, be disposed at or near the lower end of the main body 62 facing the base 10. Optionally, the boss 66 can be disposed at any position of the main body 62 along the direction L as required. As shown, two bosses 66 can be arranged relatively in the circumferential direction. Alternatively, more bosses can be arranged at intervals in the circumferential direction. Each boss 66 includes a long hole 68 extending circumferentially around the central axis. The fastener 70 (for example, a screw shown in the figure) extends through the long hole 68 into a corresponding fastening hole (not shown in the figure) formed on the housing 20. In the illustrated example, the fastener 70 includes a head 72 with a larger outer diameter and a column 74 with a smaller outer diameter. The size of the head 72, the column 74 and the long hole 68 is designed so that when the fastener 70 is installed as described above, the long hole 68 only allows the column 74 to pass through and extend into the fastening hole on the housing 20, but blocks the head 72 from passing through. In addition, the column 74, in particular the free end thereof opposite to the head 72, is designed to be fastened to a fastening hole on the housing 20, for example, by interference fit or (as shown in the figure, by screws) threaded connection. The boss 66 can also be formed as an annular boss 66 extending in the circumferential direction, on which two or more long holes 68 can be provided.

[0048] In this way, when the operating component 60 is attached to the housing 20 using the fastener 70, on the one hand, the operating component 60 is fastened to the housing 20 in the direction L, so that the housing 20 moves synchronously when the operating component 60 moves along the direction L; on the other hand, the long hole 68 extending in the circumferential direction enables the operating component 60 to move circumferentially relative to the housing 20, or in other words, the operating component 60 can rotate relative to the housing 20 while the housing 20 remains fixed.

[0049] The operating member 60 further includes a recessed portion 65 substantially radially inwardly recessed from the main body 62, substantially radially opposite to the protrusion 64. In the present embodiment, the recessed portion 65 is formed integrally with the main body 62, but this is not necessary. Accordingly, the segment 26 of the housing 20 includes a first recess 21 for receiving the protrusion 64 therein, a second recess (not shown in the figure) for receiving the boss 66 therein, and a third recess 23 for receiving the recessed portion 65 therein. A notch 29 extending in the direction L is further formed on the outer circumferential surface of the side wall 22 of the housing 20. The portion of the threaded rod 54 of the adjusting wheel 50 of the machine tool that is not received by the groove 56 of the seat wall 14 is partially engaged with the recessed portion 65 in the direction L, and the other portion is received in the notch 29.

[0050] The recessed portion 65 of the operating member 60 is configured to achieve driven engagement and non-driven engagement with the adjusting wheel 50. As shown, the recessed portion 65 includes a first engagement portion 82, which is configured to have an internal thread that can be threadedly engaged with the threaded rod 54 of the adjusting wheel 50. When the first engagement portion 82 is threadedly engaged with the threaded rod 54 of the adjusting wheel 50, if the adjusting wheel 50 is rotated by the operator, the operating member 60 (and the housing 20) are driven by the adjusting wheel 50 to move together in the direction L, which is a fine adjustment operation. At this time, the engagement of the first engagement portion 82 with the threaded rod 54 of the adjusting wheel 50 can be referred to as "driven engagement" of the fine adjustment device and the switching device. The recessed portion 65 may also include a second engagement portion 84, which is different from the first engagement portion 82 only in that the second engagement portion 84 does not have an internal thread that can be threadedly engaged with the threaded rod 54 of the adjusting wheel 50. When the operating member 60 is rotated to the point where the second engagement portion 84 engages with the threaded rod 54 of the adjusting wheel 50, the rotation of the adjusting wheel 50 will not drive the operating member 60 (and the housing 20) to move in the direction L. Therefore, the engagement of the second engagement portion 84 with the threaded rod 54 of the adjusting wheel 50 can be referred to as a "non-driven engagement" of the fine adjustment device and the switching device, and at this time, the operator can manually operate the operating member 60 and / or the housing 20 to move both together in the direction L to achieve a coarse adjustment operation. The switching between the coarse adjustment operation and the fine adjustment operation is achieved by the operator rotating the operating member 60. During this switching process, since the threaded rod 54 is always engaged with the groove 56 of the base and the notch 29 of the housing at the same time, the housing 20 shown cannot rotate relative to the base 10.

[0051] In addition, from Figure 5 It can be clearly seen from the bottom view of and 6-8 that the engagement surfaces of the first engagement portion 82 and the second engagement portion 84 of the recessed portion 65 for engaging the threaded rod 54 of the adjusting wheel 50 are both concave surfaces, for example, they can be complementary to the threaded rod 54. Optionally, these engagement surfaces can be one or more planes with internal thread teeth and / or one or more curved surfaces with internal thread teeth. In the case of being able to provide the above functions, the present application does not limit the specific structure of the two engagement portions 82 and 84, for example, the shape and size of their engagement surfaces can be the same or different. In the illustrated example, the first engagement portion 82 and the second engagement portion 84 extend radially outward and toward the seat wall 14 beyond the outer circumference of the operating component 60. This, on the one hand, increases the engagement area between the threaded rod 54 of the adjusting wheel 50 and each engagement portion, and on the other hand, it plays a stopper role in preventing the operating component 60 from over-rotating when the operating component 60 is rotated and switched by the operator. However, those skilled in the art will understand that this is not necessary.

[0052] As shown, the first engagement portion 82 and the second engagement portion 84 of the recessed portion 65 can be separated by a convex transition portion 86 to provide an intermediate separation effect. The provision of the convex transition portion 86 can ensure that the threaded rod 54 of the adjusting wheel 50 stays stably and reliably in the driven engagement position and the non-driven engagement position engaged with the first engagement portion 82 or the second engagement portion 84. The provision of the convex transition portion 86 also enables the operator to clearly perceive the completion of the switching action when operating the operating component 60 to switch between the driven engagement position and the non-driven engagement position with the adjusting wheel 50. However, in the case of being able to provide the above-mentioned functions, various details of the recessed portion 65 can be modified, for example, the transition portion 86 can be omitted.

[0053] According to the machine tool of the first embodiment described in detail above, before the machine tool is turned on, the state of the machine tool is usually that the switching device (operating component 60) is drivingly engaged with the fine adjustment device (adjusting wheel 50) ( Figure 7 ), and the locking device 30 is in the locked position ( Figure 1 and 2 ), which is the state in which the machine tool (last time) performed a workpiece processing task (locked state after fine adjustment operation). Before using the machine tool to perform a new workpiece processing operation, the operator first operates the operating member 38 to loosen the locking member 36 and put the locking device 30 in the unlocked state, and then rotates the operating member 60 counterclockwise to make it move from Figure 7 The drive engagement position is rotated to Figure 6 The second engagement portion 84 is shown in the non-driven engagement position engaged with the threaded rod 54 of the adjustment wheel 50. At this time, the housing 20 can be moved relative to the base 10 in the direction L. The operator holds the operating member 60 (and / or the housing 20) and moves them relative to the base 10 in the direction L to a roughly desired position, which is a coarse adjustment operation. Then, the operator rotates the operating member 60 in the opposite direction clockwise from Figure 6 The non-driven engagement position is switched to Figure 7 The operating member 60 and the housing 20 are moved together in a direction L relative to the base. Depending on the thread parameter details of the threaded connection between the adjusting wheel 50 and the first engaging portion 82 of the operating member 60, the precision that can be achieved in this fine adjustment operation can reach 0.1-0.5 mm. For example, the precision that can be achieved in the coarse adjustment operation is 1 mm.

[0054] In the present embodiment described in detail above, the switching operating portion of the switching device for the operator to operate and the portion (recessed portion 65) engaged with the fine adjustment device are provided by the same component (operating component 60 of the switching device), and the switching device is also particularly provided with a portion (second engaging portion 84) that is non-drivenly engaged with the fine adjustment device when the operating component 60 is moved away from the driven engagement with the fine adjustment device. However, according to the principles of the present application, the switching operating portion of the switching device and the portion engaged with the fine adjustment device do not necessarily have to be provided by the same component, for example, the recessed portion 65 can be formed independently of the operating component 60 and attached thereto, as in the second embodiment to be described later. In addition, the above-mentioned second engaging portion 84 is not necessary in the case of ensuring that the operator can move the switching device away from the driven engagement with the fine adjustment device when operating it.

[0055] Reference below Figure 10-12 A second embodiment of the present application is described, in which the parts or components corresponding to those in the first embodiment are indicated by the same reference numerals. The second embodiment differs from the first embodiment only in the structure of the switching device and the corresponding structural features on the housing. In this second embodiment, the operating member 60 of the switching device only provides the above-mentioned switching operating part and the attachment feature to the housing 20, and the switching device also includes a driven member 80 for engaging with the fine adjustment device.

[0056] In this embodiment, the body 62 of the operating member 60 includes an inner ring 62a and an outer ring 62b and a connecting wall connecting the two (e.g., a bottom wall and other connecting walls not shown in the figure), so that the body 62 has a large radial thickness. The portion of the outer peripheral surface of the outer ring 62b exposed to the notch 16 of the base 10 is used as a switching operating portion.

[0057] Different from the first embodiment described above, the bosses 66 of the operating member 60 of this embodiment attached to the housing 20 extend radially outward from the body 62 and also provide a long hole 68 extending in the circumferential direction for the column portion 74 of the fastener 70 to pass through. The operating member 60 can be designed so that the outermost dimension of each boss 66 is substantially equal to the outermost dimension of the side wall 22 of the housing 20, so that the operating member 60 and the housing 20 can be inserted into the seat body wall 14 together. In addition, in this embodiment, the bosses 66 of the operating member 60 extend radially outward from the upper end of the operating member 60 close to the housing 20.

[0058] The driven member 80 of the present second embodiment is configured to be attached to the operating member 60 and to be movable relative to the operating member 60 to achieve (driven) engagement and disengagement with the adjustment wheel 50. Thus, the driven member 80 includes an engagement portion 81 configured to be threadedly engaged with the threaded rod 54 of the adjustment wheel 50. Unlike the switching device in the first embodiment that provides both the first engagement portion 82 and the second engagement portion 84, the second embodiment does not provide a portion or member that is non-drivenly engaged with the adjustment wheel 50.

[0059] like Figure 8 As shown, the driven component 80 of the switching device of the second embodiment also includes a rod portion 83 extending from the engaging portion 81, and the two can be formed integrally as shown in the figure, or formed separately and then attached together. In this embodiment, when viewed along the direction L, the engaging portion 81 has a generally arc-shaped structure, and the concave surface 87 of the arc-shaped structure has an internal thread that engages with the external thread of the threaded rod 54 of the adjusting wheel 50, and the rod portion 83 extends from the opposite convex surface 89 of the engaging portion 81. Correspondingly, the main body 62 of the operating component 60 includes a through hole 69 extending through the main body 62 (for example, in a radial direction) and suitable for slidably receiving the rod portion 83, and a recessed portion 67 extending outward from its inner circumferential surface 63 (for example, in a radial direction) to the inside of the main body 62.

[0060] The switching device further includes a seat body 96 and an elastic element 98 configured to be fastened (e.g., threadedly connected) to the free end 71 of the rod 83. Accordingly, the extension portion 24 of the housing 20 includes a recess 31 disposed on its outer peripheral surface 27. The recess 31 is formed by an inclined surface 33 ( Fig.11 and 12 ) is connected to the outer peripheral surface 27 of the extension portion 24 of the housing 20. The seat body 96 includes an abutment surface 97 facing away from the driven member 80.

[0061] Fig.11 Schematic diagram of the fine adjustment device and the switching device in a driving engagement state. The engaging portion 81 (internal thread) of the driven component 80 of the switching device engages the threaded rod 54 (external thread) of the adjusting wheel 50, and the rod 83 of the driven component 80 extends radially inward through the through hole 69 on the main body 62 of the operating component 60, and the seat body 96 is fastened to the free end 71 of the rod 83. At this time, the seat body 96 is at least partially received in the recess 67 of the main body 62 of the operating component 60, and its abutting surface 97 abuts against the outer peripheral surface 27 of the extension portion 24 of the housing 20, and the elastic element 98 in the form of a spring is compressed between the seat body 96 and the recess 67 of the main body 62 of the operating component 60. At this time, the operator rotates the adjusting wheel 50, and the entire switching device and the housing 20 can move upward or downward in the direction L at the same time to achieve the fine adjustment operation.

[0062] When it is necessary to switch to the coarse adjustment state, the operator rotates the operating member 60 counterclockwise, and the operating member 60 drives the other components of the switching device (including the driven member 80, the seat body 96 and the spring 98) to rotate counterclockwise. Fig.12At this time, under the elastic force of the elastic element 98, the seat body 96 is pushed radially inward into the recess 31, and the abutting surface 97 abuts against the inner bottom wall of the recess 31. In this process, the driven component 80 is driven by the seat body 96 to move radially inward, so that the engaging portion 81 of the driven component 80 is moved away from the threaded engagement with the threaded rod 54 of the adjusting wheel 50. Therefore, in this position, the switching device is not engaged with the fine adjustment device, and the operator can manually move the switching device and the housing 20 to perform a coarse adjustment operation.

[0063] When switching from the coarse adjustment operation to the fine adjustment operation, on the contrary, the operating member 60 is rotated clockwise, and the operating member 60 drives the driven member 80, the seat body 96 and the elastic element 98 to rotate clockwise together, and the seat body 96 moves along the inclined surface 33 to abut against the outer peripheral surface 27 against the action of the elastic element 98, and at this time, the engaging portion 81 of the driven member 80 is again engaged with the thread of the threaded rod 54 of the adjusting wheel 50. As shown in the figure, the engaging portion 81 of the driven member 80 is configured to prevent the operating member 60 from being further rotated clockwise once it can engage with the threaded rod 54 of the adjusting wheel 50.

[0064] As can be seen from the two embodiments described above with reference to the accompanying drawings, the machine tool of the present application is provided with a fine adjustment device that is engaged with the base and can be moved by an operator, and a switching device that is engaged with the housing and can be disengaged from the fine adjustment device, and the switching device is constructed to include an operating portion that can be operated by an operator to be able to move between a first position and a second position relative to the housing, and a driven portion for engaging with the driving portion of the fine adjustment device. When the switching device is in the first position, the switching device is drivingly engaged with the fine adjustment device, so that the fine adjustment device can drive the fine adjustment device and the housing to move in the direction in which the tool extends when the fine adjustment device is moved by the operator, thereby achieving a fine adjustment operation. When the switching device is in the second position, the switching device is not drivingly engaged with the fine adjustment device, and the fine adjustment device and the housing are disengaged from the fine adjustment device so that they can move in the direction in which the tool extends under the manual operation of the operator, thereby achieving a coarse adjustment operation. In this way, the purpose of adjusting the tool processing depth is achieved.

[0065] According to the principles of the present application, when the switching device is in the second position, the switching device is not drivenly engaged with the fine-adjusting device and any suitable configuration can be provided to achieve this. For example, as in the first embodiment, although the switching device and the fine-adjusting device maintain contact or engagement, the movement of the switching device cannot drive the fine-adjusting device to move along the direction L, that is, the two have a "non-driven engagement position"; for another example, as in the second embodiment, the driven part of the switching device is disengaged from the contact or engagement with the driving part of the fine-adjusting device to achieve the purpose of "no driving".

[0066] According to the principles of the present application, the operating part and the driven part of the switching device can be provided by the same component (the operating component 60 of the first embodiment) or by different components (the operating component 60 and the driven component 80 of the second embodiment).

[0067] Although in the embodiment of the reference drawings, the switching device rotates relative to the housing 20 when operated by the operator, the present application is not limited to the situation where the movement of the switching device relative to the housing 20 is rotation, as long as the switching device and the fine-adjusting device can achieve (driven) engagement and disengagement (driven) engagement. The attachment of the operating part of the switching device to the housing is not limited to the boss-type attachment structure shown in the figure. Although in the embodiment of the reference drawings, the driven engagement of the switching device and the fine-adjusting device is a threaded engagement, the present application is not limited thereto. The engagement between the driving part of the fine-adjusting device and the driven part of the switching device is not limited to the threaded engagement shown in the figure.

[0068] Those skilled in the art will appreciate that the embodiments described above are merely exemplary, and that various details and features may be deleted and / or modified without departing from the essence of the present application, and the resulting technical solutions are all within the scope defined by the appended claims.

Claims

1. A machine tool, comprising: Base (10); a housing (20) configured to attach a tool of the machine tool; and a fine adjustment device, which is attached to the base (10) and is configured to be operable by an operator to move relative to the base, characterized in that the machine tool also includes: A switching device is attached to the housing (20) and is configured to be able to be operated by an operator to move between a first position and a second position relative to the housing (20), the fine-tuning device and the switching device respectively comprising a driving part and a driven part, the driving part and the driven part being configured to: engage when the switching device is in the first position so that the movement of the fine-tuning device drives the switching device and the housing (20) to move together in a direction (L) relative to the base, and disengage when the switching device is in the second position so that the switching device and the housing (20) can move independently of the fine-tuning device in the direction (L) relative to the base.

2. The machine tool according to claim 1, characterized in that The driving portion is a threaded rod (54) including external threads, and the driven portion includes internal threads configured to engage with the external threads.

3. The machine tool according to claim 2, characterized in that The base (10) and the housing (20) respectively include a cylindrical seat wall (14) and a cylindrical side wall (22), wherein the seat wall (14) is adapted to receive at least a portion of the side wall (22) and the switching device and includes a notch portion (16), and the switching device includes a switching operating portion exposed to the notch portion so as to be operable by an operator.

4. The machine tool according to claim 3, characterized in that The switching device includes an operating member (60) which provides the switching operation portion and includes an annular body (62) which is attached to the housing (20) so that the switching device can rotate between a first position and a second position relative to the housing.

5. The machine tool according to claim 4, characterized in that The switching operation portion is configured as: a protrusion extending from the annular body (62) toward the base (10) along the direction (L) or extending from the annular body (62) transversely to the direction (L); and / or a portion of the outer peripheral surface of the annular body (62) exposed to the notch portion, The protrusion or the portion may or may not include an uneven feature that facilitates operation by an operator.

6. The machine tool according to claim 4, characterized in that The operating component (60) includes a boss (66) extending from the annular body (62) transversely to the direction (L), the boss is formed with a long hole (68) extending in the circumferential direction around the central axis of the annular body and penetrating the boss in the direction (L), and the fastener (70) extends through the long hole (68) to a fastening hole formed on the housing (20).

7. The machine tool according to claim 6, characterized in that The fastener (70) is a threaded fastener, and the fastening hole is a threaded hole.

8. The machine tool according to claim 7, characterized in that The operating member (60) also provides the driven portion, which is formed integrally with the annular body (62) or is fastened to the annular body (62).

9. The machine tool according to claim 8, characterized in that The operating member (60) includes a recessed portion (65) recessed radially inward from the annular body (62), the recessed portion including a first engaging portion (82) and a second engaging portion (84) respectively engaging with the threaded rod (54) when the switching device is in the first position and the second position, the first engaging portion (82) serving as the driven portion, The first engaging portion (82) and the second engaging portion (84) respectively include first and second concave surfaces for engaging the threaded rod (54), and the first and second concave surfaces are directly connected, or the recessed portion also includes a convex transition portion (86) that separates the first engaging portion (82) from the first engaging portion (82) in the circumferential direction.

10. The machine tool according to claim 9, characterized in that The first engagement portion (82) and the second engagement portion (84) are configured to prevent the threaded rod (54) from further rotating the operating member (60) when engaged with the threaded rod (54).

11. The machine tool according to claim 7, characterized in that: The switching device also includes a driven component (80) providing the driven portion, the driven component (80) being movably attached to the operating component (60) so that: when the operating component (60) is in a first position, the driven portion engages with the driving portion, and when the operating component (60) is moved away from the first position, the driven portion disengages from the driving portion.

12. The machine tool according to claim 11, characterized in that The driven member (80) moves radially relative to the operating member (60).

13. The machine tool according to claim 12, characterized in that The driven component (80) includes a single engaging portion (81), the engaging portion includes an engaging surface (87) having an internal thread and serving as the driven portion, the driven component (80) also includes a rod portion (83) extending from a surface (89) of the engaging portion opposite to the engaging surface (87), the annular body (62) includes a through hole (69) allowing the rod portion to pass through, and the switching device also includes: a seat body (96) configured to be fixed to a free end (71) of the rod portion (83) and including an abutment surface (97) configured to abut the housing (20); and an elastic element (98) arranged between the seat body (96) and the operating component (60).

14. The machine tool according to claim 13, characterized in that The housing (20) includes an outer peripheral surface (27) and a recess (31) formed on the outer peripheral surface, at least one of the side surfaces defining the recess (31) is an inclined surface (33) connected to the outer peripheral surface, and the seat body (96) is configured such that: when the operating component (60) is in a first position, the abutting surface abuts against the outer peripheral surface (27) and when the operating component (60) is in a second position, the seat body (96) is at least partially received in the recess (31).

15. The machine tool according to any one of claims 1 to 14, characterized in that: The machine tool is a trimmer.

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