Edge trimmer

Abstract

The utility model relates to an edge trimmer which is provided with a cutter, the edge trimmer comprises a machine shell, a motor arranged in the machine shell, an output shaft driven by rotation of the motor and a clamping device installed on the output shaft, the clamping device is connected with the cutter, and the clamping device moves in the axial direction of the output shaft so as to clamp or loosen the cutter; the clamping device comprises a connecting part connected to the output shaft, the output shaft is provided with a matching part connected to the connecting part, the inner surface of the matching part is provided with an internal thread section, the outer surface of part of the connecting part is provided with an external thread section, and the matching part is in threaded connection with the connecting part. The inner thread section is arranged on the inner surface of the matching part, the outer thread section is arranged on the outer surface of part of the connecting part, the matching part and the connecting part are directly connected in a threaded mode, the structure is simple, a cutter can be effectively clamped, and more labor is saved when a user tightens the cutter.

Description

[TECHNICAL FIELD]

[0001] The utility model relates to a trimming machine, in particular to a trimming machine for decoration, building and the like. [BACKGROUND]

[0002] The trimming machine is a power work driven by a driving unit to rotate an output unit to process wood and the like, and has an irreplaceable position in the construction and decoration industries. A clamping device is usually installed on the output shaft of the trimming machine, and the user can fix the tool to the output shaft after applying a clamping force to realize the trimming, polishing and other operations required by the trimming machine.

[0003] In the prior art trimming machine, please refer to the Chinese utility model patent CN211029867U announced on July 17, 2020, which discloses a trimming machine including a motor unit and a self-locking clamp. The clamp is connected to the motor unit, and a tool is installed on the clamp. The clamp of the above-mentioned trimming machine includes a knob, a bushing, a chuck and a coil spring and other components. The components are many and the installation is complicated. It is easy to lose some parts when disassembling the chuck or replacing the tool. The user rotates the knob relative to the bushing to adjust the clamp to the locked position. In actual operation, a lot of force is needed to lock the chuck. It is easy to appear that the trimming machine works in the state that the tool is not clamped tightly, which leads to rough or damaged processing surface of the workpiece, and the operation safety is low.

[0004] Therefore, it is necessary to provide an improved trimming machine to overcome the defects of the prior art. [SUMMARY]

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a trimming machine which is clamped tightly and has a simple structure.

[0006] The utility model solves the problems of the prior art by adopting the following technical scheme: a trimming machine is provided with a tool. The trimming machine includes a machine shell, a motor arranged in the machine shell, an output shaft driven to rotate by the motor, and a clamping device mounted on the output shaft. The clamping device is connected to the tool. The clamping device moves axially along the output shaft to clamp or release the tool. The clamping device includes a connecting portion connected to the output shaft. The output shaft has a matching portion connected to the connecting portion. The inner surface of the matching portion is provided with an internal thread segment. The outer surface of part of the connecting portion is provided with an external thread segment. The matching portion and the connecting portion are threadedly connected.

[0007] Further improvement is that the matching portion further has a first guide portion radially contracted from the inner edge. The connecting portion has a second guide portion extending from the external thread segment. The second guide portion is funnel-shaped, and the first guide portion is combined with the second guide portion.

[0008] Further improvement scheme is that the clamping device further comprises an operation part protruding from the second guide part, and the operation part has at least two parallel flat operation surfaces.

[0009] Further improvement scheme is that the length of the outer thread segment is greater than the sum of the length of the second guide part and the length of the operation part.

[0010] Further improvement scheme is that the length of the operation part is not less than 3 mm.

[0011] Further improvement scheme is that the clamping device further comprises an inner hole axially penetrating the connecting part and an opening recessed from the outer circumferential surface of the connecting part, the tool is installed in the inner hole, and the opening is communicated with the inner hole.

[0012] Further improvement scheme is that the clamping device has a locking position for locking the tool and an unlocking position for releasing the tool, in the locking position, the opening is contracted, and the connecting part clamps the tool, in the unlocking position, the opening is expanded, and the tool is separated from the connecting part.

[0013] Further improvement scheme is that the number of the openings is at least 3, and the openings are uniformly distributed on the connecting part.

[0014] Further improvement scheme is that the length of the inner thread segment is greater than the length of the outer thread segment.

[0015] Compared with the prior art, the utility model has the advantages that the inner thread segment is arranged on the inner surface of the cooperation part, the outer thread segment is arranged on the outer surface of part of the connecting part, the cooperation part and the connecting part are directly connected in a threaded connection mode, the structure is simple, the tool can be effectively clamped, and the user is more labor-saving when tightening. Specifically, the first guide part of the cooperation part is combined with the second guide part of the connecting part, and the second guide part is funnel-shaped, so that the clamping device can be conveniently contracted inward after being stressed, and the tool can be better clamped; further, the clamping device further has an inner hole axially penetrating the connecting part and an opening recessed from the outer circumferential surface of the connecting part, the tool can be conveniently replaced by adjusting the contraction and expansion states of the opening; in addition, the operation part has at least two parallel flat operation surfaces, so that the trimming machine can be balanced at high speed. [SUMMARY]

[0016] The specific embodiments of the utility model will be further described in detail below with reference to the drawings:

[0017] Figure 1 is a structure schematic view of the trimming machine of the utility model;

[0018] Figure 2 isFigure 1 a sectional view of the trimming machine shown in the figure;

[0019] Figure 3 Figure 1 a partial structural sectional view of the trimming machine shown in the figure;

[0020] Figure 4 Figure 3 a structural view of the clamping device of the trimming machine shown in the figure;

[0021] Figure 5 Figure 3 a sectional view of the clamping device of the trimming machine shown in the figure. [DETAILED DESCRIPTION]

[0022] The utility model will be explained in further detail below in combination with the drawings and embodiments.

[0023] The terms used in the utility model are merely for the purpose of describing specific embodiments, and are not intended to limit the utility model. For example, the words indicating the orientation or position relationship such as "upper", "lower", "front", "rear" and the like below are merely based on the orientation or position relationship shown in the drawings, and are merely for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the devices / elements indicated must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0024] Please refer to Figures 1 to 3 The embodiment of the utility model relates to a trimming machine 100 for trimming, slotting and other working operations on wood and other workpieces. The trimming machine 100 comprises a machine shell 1, a motor 2 arranged in the machine shell 1, an output shaft 3 rotationally driven by the motor 2, and a clamping device 4 mounted on the output shaft 3, and a cutter (not shown) mounted on the clamping device 4. Under the action of the driving source, the motor 2 drives the output shaft 3 to rotate, and when the user performs the working operation, the base (not shown) of the trimming machine 100 is in contact with the workpiece, and the trimming machine is moved according to the required trajectory, so that the cutter trims the working surface of the workpiece.

[0025] In the embodiment, the clamping device 4 has a locking position for locking the cutter and an unlocking position for releasing the cutter, so that the clamping device 4 can move axially along the output shaft 3 to clamp or release the cutter. Specifically, the clamping device 4 further comprises an inner hole 44 axially penetrating the connecting portion and an opening 42 recessed from the outer circumferential surface of the connecting portion 41, the cutter is mounted in the inner hole 44, and the opening 42 is communicated with the inner hole 44. Further, the number of openings 42 is at least three, and the openings 42 are uniformly distributed on the connecting portion 41, so that after the clamping device 4 is pressed, the diameter of the inner hole 44 gradually decreases with the contraction of the openings 42, making it more labor-saving for the user to tighten, and effectively clamping the cutter.​​​

[0026] As shown in Figure 2 and Figure 3 The clamping device 4 includes a connecting portion 41 connected to the output shaft 3, the output shaft 3 has a matching portion 31 connected to the connecting portion 41, the inner surface of the matching portion 31 is provided with an internal thread segment 311, and the outer surface of part of the connecting portion 41 is provided with an external thread segment 411. The matching portion 31 and the connecting portion 41 are threadedly connected. The connecting portion 41 is directly mounted to the matching portion 31 via the external thread segment 411, which is simple in structure, reduces the use of fastening parts such as nuts, and improves the convenience of users to replace tools.

[0027] In the embodiment, the matching portion 31 further has a first guide portion 312 radially retracted from the inner edge, and the connecting portion 41 has a second guide portion 412 extending from the external thread segment 411, the second guide portion 412 is funnel-shaped, and the first guide portion 312 is combined with the second guide portion 412. When installed, it can be better positioned, so that the user can quickly insert the tool into the matching portion 31. It should be noted that the second guide portion 412 is funnel-shaped, which is conducive to the conversion of the contraction force along the clamping device 4 in the axial direction.

[0028] Specifically, when in the locked position, i.e., the matching portion 31 and the connecting portion 41 are in the connected state, the second guide portion 412 is subjected to a force, so that the opening 42 is retracted, the diameter of the inner hole 44 is reduced, and the connecting portion 41 thereby clamps the tool; when in the unlocked position, i.e., the matching portion 31 and the connecting portion 41 are in the disconnected state, the force applied to the second guide portion 412 is removed, thereby reducing the force applied to the opening 42, the opening 42 is opened, the diameter of the inner hole 44 is increased, and the tool is disconnected from the connecting portion 41. In the embodiment, the user can quickly install the tool on the trimming machine 100 by operating the clamping device 4 to switch between the locked position and the unlocked position, without the need for additional procedures, so as to realize the replacement of the tool.

[0029] Further, the length of the internal thread segment 311 is greater than the length of the external thread segment 411, and there is enough installation stroke to better clamp the tool.

[0030] As shown in Figure 4 and Figure 5As shown, the clamping device 4 further comprises an operation part 43 protruding from the second guide part 412, when a user operates a wrench or the like tool to rotate the operation part 43, the cutter can be switched from the locked position to the unlocked position, facilitating the replacement of the cutter. Specifically, the operation part 43 has at least two flat operation surfaces 431, the two flat operation surfaces 431 are parallel, facilitating the clamping of the wrench, so that the user can better exert force. It should be noted that the number of flat operation surfaces 431 is preferably even, which can be 2 or 4 or 6, etc. In the embodiment, the number of flat operation surfaces 431 is 6, on the one hand, it is convenient for the user to use the wrench to rotate the operation part 43 in multiple ways and at multiple angles; on the other hand, the six can form a state of symmetry two by two, which is beneficial to the balance of the edge trimmer 100 under high-speed operation.

[0031] In the embodiment, the length of the operation part 43 is not less than 3mm, leaving a certain operation space for the wrench and the like tool, so that the user can quickly replace the cutter, shorten the time and improve the use efficiency.

[0032] Specifically, the length of the external thread segment 411 is greater than the sum of the length of the second guide part 412 and the length of the operation part 43, increasing the stress area of the cutter clamping, avoiding the phenomenon of loose or loose of the cutter in work, improving the safety of the user.

[0033] The utility model is not limited to the above-mentioned specific implementation. Those skilled in the art can easily understand that the edge trimmer of the utility model has many alternative solutions without departing from the principles and categories of the utility model. The protection scope of the utility model is subject to the contents of the claims.

Claims

1. A trimmer equipped with a cutting tool, comprising a housing, a motor disposed within the housing, an output shaft rotationally driven by the motor, and a clamping device mounted on the output shaft, the clamping device being connected to the cutting tool and moving axially along the output shaft to clamp or release the cutting tool; characterized in that: The clamping device includes a connecting portion connected to the output shaft, the output shaft has a matching portion connected to the connecting portion, the inner surface of the matching portion is configured with an internal thread segment, and the outer surface of part of the connecting portion is configured with an external thread segment, and the matching portion is threadedly connected to the connecting portion.

2. The trimming machine according to claim 1, characterized in that: The matching portion further comprises a first guide portion that contracts radially from the inner edge, and the connecting portion comprises a second guide portion that extends from the external thread segment, wherein the second guide portion is funnel-shaped, and the first guide portion is combined with the second guide portion.

3. The trimming machine according to claim 2, characterized in that: The clamping device further includes an operating portion protruding from the second guide portion, wherein the operating portion has at least two flat operating surfaces, and the at least two flat operating surfaces are parallel to each other.

4. The trimming machine according to claim 3, characterized in that: The length of the external thread section is greater than the sum of the length of the second guide portion and the length of the operating portion.

5. The trimming machine according to claim 3, characterized in that: The length of the operating portion is not less than 3 mm.

6. The trimming machine according to claim 1, characterized in that: The clamping device further includes an inner hole axially penetrating the connecting portion and an opening recessed from the outer peripheral surface of the connecting portion. The tool is installed in the inner hole, and the opening is connected to the inner hole.

7. The trimming machine according to claim 6, characterized in that: The clamping device has a locking position for locking the tool and an unlocking position for releasing the tool. In the locking position, the opening is contracted and the connecting portion clamps the tool. In the unlocking position, the opening is opened and the tool is separated from the connecting portion.

8. The trimming machine according to claim 7, characterized in that: The number of the openings is at least 3, and the openings are evenly distributed on the connecting portion.

9. The trimming machine according to claim 1, characterized in that: The length of the internal thread section is greater than the length of the external thread section.

Images