A sander

Abstract

This utility model provides a sander, including a sander body, a base, a clamping mechanism, and a tensioning mechanism. The sander body contains a motor with a protective outer shell, and the motor output shaft drives the base to reciprocate through an eccentric shaft. The clamping mechanism is located at both ends of the base, with clamping components one and two clamping components respectively clamping the two ends of the sandpaper on the bottom surface of the base, allowing the sandpaper to be laid flat and supported. The tensioning mechanism is slidably mounted on the base, and clamping component one is pivotally mounted on the tensioning mechanism and moves with it. When the base reciprocates, the tensioning mechanism is displaced due to centrifugal force: initially, the sandpaper is only fixed by the clamping mechanism; when the base begins to move, the tensioning mechanism performs centrifugal motion, stretching the sandpaper to the tensioned position. This design achieves automatic constant tension control of the sandpaper through centrifugal force, effectively reducing sandpaper wrinkles and wear and extending its service life, eliminating the need for manual tensioning.

Description

Technical Field

[0001] This utility model relates to the field of power tools, specifically to a sander. Background Technology

[0002] A sander is an electric tool that uses high-speed reciprocating / rotational motion to drive sandpaper to polish the surface of a workpiece. It is widely used in the finishing of materials such as wood, metal, and plastic. Its power transmission method is: motor output shaft → eccentric mechanism → converted into reciprocating motion of the base (common in flatbed sanders). The sandpaper, supported on the base, rubs against the workpiece surface under pressure, achieving the functions of deburring, leveling, and polishing.

[0003] When ordinary sandpaper is clamped in the sandpaper holder, the middle part of the sandpaper is very loose. This causes the sandpaper to repeatedly move during use, resulting in reduced sanding efficiency and sandpaper breakage. Utility Model Content

[0004] To solve the above problems, this utility model provides a sanding machine.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A sander, comprising: The main body of the sander has an output shaft that outputs torque. The base is eccentrically connected to the output shaft and is suitable for reciprocating motion along a predetermined direction under torque drive. The clamping mechanism includes a clamping component one and a clamping component two disposed at both ends of the base, for clamping sandpaper to the lower surface of the base; A tensioning mechanism is slidably mounted on the base, and a clamping assembly is pivotally mounted on the tensioning mechanism. The tensioning mechanism has an initial position and a tensioned position; when the base reciprocates, the tensioning mechanism moves from the initial position to the tensioned position under the action of centrifugal force to tension the sandpaper.

[0006] Furthermore, the base has a limiting boss for restricting the tensioning mechanism from moving back from the tensioned position to the initial position.

[0007] Furthermore, a limiting component matching the limiting boss is pivotally mounted on the tensioning mechanism. The limiting component includes a limiting pawl for abutting against the limiting boss to keep the tensioning mechanism in a tensioned position, a limiting shaft, and a driving part for driving the limiting pawl to abut against the limiting boss. The limiting pawl and the driving part are pivotally mounted on the tensioning mechanism via the limiting shaft.

[0008] Furthermore, the clamping assembly includes a clamping part for clamping sandpaper, a clamping rotating shaft supported by the tensioning mechanism, and a torsion part for driving the clamping part to clamp the sandpaper. The clamping part is provided with an unlocking protrusion that cooperates with a limiting pawl. The limiting pawl includes a locking end and an unlocking end located on opposite radial sides of the limiting rotating shaft. When the clamping part is rotated in the direction of releasing the sandpaper, the unlocking protrusion abuts against the unlocking end, causing the limiting pawl to rotate around the limiting rotating shaft against the action of the driving part, so that the locking end disengages from the limiting protrusion, thereby allowing the tensioning mechanism to move from the tensioned position to the initial position.

[0009] Furthermore, it also includes a reset part extending along the movement direction of the base. One end of the reset part is connected to the base, and the other end is connected to the tensioning mechanism, which is used to drive the tensioning mechanism to reset from the tensioned position to the initial position.

[0010] Furthermore, the tensioning mechanism includes a sliding seat with outwardly extending limiting protrusions on both sides. The base has a limiting groove corresponding to the limiting protrusions, and the limiting protrusions are embedded in the limiting grooves and can slide along them.

[0011] Furthermore, the base includes a base plate and a pad, the pad being fixed to the bottom surface of the base plate, the base plate being used to mount the clamping mechanism, and the pad being used to support the clamped sandpaper.

[0012] Furthermore, the clamping assembly two is pivotally mounted on the base.

[0013] The advantages of this utility model over the prior art are as follows: This utility model pivotally mounts a clamping component onto a tensioning mechanism. When the sandpaper is clamped by the clamping mechanism onto the lower surface of the base, the sander is started to make the base reciprocate. This causes the tensioning mechanism, which is slidably mounted on the base, to move relative to the base under centrifugal force. That is, the tensioning mechanism moves from the initial position to the tensioned position, thereby stretching the sandpaper and achieving the purpose of automatically tensioning the sandpaper. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the sander in the embodiment of this utility model; Figure 2 This is a schematic diagram of the tensioning mechanism in its initial position in an embodiment of the present invention; Figure 3 This is a front view of the tensioning mechanism in its initial position in an embodiment of this utility model; Figure 4 This is a schematic diagram of the tensioning mechanism in the tensioning position in an embodiment of the present invention; Figure 5 This is a front view of the tensioning mechanism in the tensioning position in an embodiment of this utility model; Figure 6 This is a schematic diagram of the tensioning mechanism when it is released in an embodiment of this utility model; Figure 7 This is a schematic diagram of the assembly of the tensioning mechanism and the clamping component 1 in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the base structure in an embodiment of this utility model.

[0015] In the picture: 1. Sanding machine body; 2. Base; 21. Base plate; 22. Pad; 23. Reset part; 24. Limiting boss; 25. Limiting groove; 3. Clamping mechanism; 31. Clamping component one; 311. Clamping part; 3111. Unlocking protrusion; 312. Clamping pivot; 313. Torsion part; 32. Clamping component two; 4. Tensioning mechanism; 41. Limiting component; 411. Limiting pawl; 4111. Locking end; 4112. Unlocking end; 412. Limiting pivot; 413. Drive unit; 42. Sliding seat; 421. Limiting protrusion. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0018] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0019] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two components or an interaction between two components.

[0020] Please refer to Figure 1-8 This utility model embodiment provides a sander, including a sander body 1, a base 2, a clamping mechanism 3, and a tensioning mechanism 4; wherein, the sander body 1 includes a motor and related accessories protected by a shell, the torque output by the motor's output shaft is transmitted to the base 2 through an eccentric shaft with a counterweight, when the eccentric shaft's circumferential motion is transmitted to the base 2 through a bearing / connecting rod, it is constrained by the mechanical structure (such as a slide rail limit), and the circumferential motion is forcibly converted into reciprocating motion.

[0021] The clamping mechanism 3 consists of clamping component 31 and clamping component 32 located at both ends of the base 2. The clamping component 31 and clamping component 32 clamp the two ends of the sandpaper mounted on the bottom surface of the base 2, so that it can be supported by the base 2. A tensioning mechanism 4 is also slidably installed on the base 2, and the clamping component 31 is pivotally mounted on the tensioning mechanism 4 and moves with the movement of the tensioning mechanism 4.

[0022] Due to centrifugal force, the tensioning mechanism 4 displaces relative to the base 2 when the base 2 is driven to reciprocate. This results in the tensioning mechanism 4 having an initial position and a tensioned position relative to the base 2. Specifically, when the tensioning mechanism 4 is in the initial position, the sandpaper supported under the base 2 is only held by the clamping mechanism 3. When the sander is started, the base 2 reciprocates under the drive of the output shaft, causing the tensioning mechanism 4 to move away from the base 2 under centrifugal force. This pulls the clamping assembly 31, stretching and tightening the sandpaper to the tensioned position. This embodiment achieves automatic constant tension control of the sandpaper through centrifugal force, significantly reducing sandpaper wrinkles and wear to extend its service life. Furthermore, tensioning can be achieved without manual operation, saving working time and improving work efficiency.

[0023] Please refer to Figure 4 and 8In this embodiment of the present invention, the base 2 is also provided with a limiting boss 24 corresponding to the tensioning mechanism 4. The limiting boss 24 is located in the return stroke of the tensioning mechanism 4 from the tensioning position to the initial position. Therefore, when the tensioning mechanism 4 reaches the tensioning position due to centrifugal force, the limiting boss 24 can abut against the tensioning mechanism 4 to prevent the tensioning mechanism 4 from returning to the initial position under the drive of the reset part 23, thereby keeping the sandpaper in a tensioned state.

[0024] Please refer to Figure 2-7 In this embodiment of the present invention, the tensioning mechanism 4 is provided with a limiting component 41 near the limiting boss 24. The limiting component 41 includes a limiting pawl 411, a limiting rotating shaft 412, and a driving part 413. The limiting rotating shaft 412 is fixedly installed on the tensioning mechanism 4, and the central winding part of the driving part 413 (usually a torsion spring) is sleeved and fixed on the limiting rotating shaft 412. One leg of the driving part 413 is fixed to the limiting pawl 411. When the tensioning mechanism 4 is in the tensioned position, the limiting pawl 411 can be pushed by the driving part 413 to rotate and fall into the locking area between the tensioning mechanism 4 and the limiting boss 24, so that the tensioning mechanism 4 is locked in the tensioned position by the cooperation of the limiting pawl 411 and the limiting boss 24.

[0025] Please refer to Figure 7 The clamping assembly 31 in this embodiment includes a clamping part 311, a clamping rotating shaft 312, and a torsion part 313. The clamping rotating shaft 312 is similar to the limiting rotating shaft 412, and is also fixedly mounted on the tensioning mechanism 4. The central winding portion of the torsion part 313 (usually a torsion spring) is sleeved and fixed on the clamping rotating shaft 312, but the winding direction of the torsion part 313 is opposite to that of the driving part 413. Therefore, the clamping part 311 and the limiting pawl 411 rotate in opposite directions under the drive of the torsion spring. A locking protrusion 3111 protrudes from the part 311 near the limiting pawl 411. When the clamping part 311 rotates, the locking protrusion 3111 abuts against the limiting pawl 411 and drives the limiting pawl 411 to rotate. This releases the "locked" state when the tensioning mechanism 4 is locked in the tensioned position by the cooperation of the limiting pawl 411 and the limiting protrusion 24, thus unlocking the sandpaper from being tensioned. This allows the tensioning mechanism 4 to return to its initial position, making it easier to replace the sandpaper without affecting the re-clamping of the sandpaper.

[0026] Specifically, the limiting pawl 411 includes a locking end 4111 and an unlocking end 4112 located on opposite radial sides of the limiting pivot 412. The length of the locking end 4111 is no greater than the displacement length of the tensioning mechanism 4 from the initial position to the tensioned position, allowing the locking end 4111 to fall into the locking area, thereby locking the tensioning mechanism 4 in the tensioned position. The unlocking end 4112 is adjacent to the unlocking protrusion 3111 and located within the rotation range of the unlocking protrusion 3111. Therefore, when the operating clamping part 311 rotates in the direction of releasing the sandpaper, the unlocking end 4112 abuts against the unlocking protrusion 3111 and rotates under the drive of the unlocking protrusion 3111, thereby causing the locking end 4111 to also rotate and disengage from the locking area. At this time, the tensioning mechanism 4 can return from the tensioned position to the initial position. In this embodiment, only one protrusion is provided on the clamping component 31 with clamping function, which simultaneously enables it to have the function of unlocking the tensioning mechanism 4, reducing the manual unlocking procedure and improving the operability of the entire device.

[0027] Please refer to Figure 2-6 In this embodiment of the utility model, the base 2 is also provided with a reset part 23 (usually a tension spring). The reset part 23 extends along the movement direction of the base 2, with one end connected to the base 2 and the other end connected to the tensioning mechanism 4. This enables the tensioning mechanism 4 to remain in the initial position when the sander motor is not started, and when the tensioning mechanism 4 is released from the locked state, it can drive the tensioning mechanism 4 to return from the tensioned position to the initial position, reducing the inconvenience of manual operation.

[0028] Please refer to Figure 2-6 The tensioning mechanism 4 in this embodiment of the present invention also includes a sliding seat 42 for supporting the clamping component 31. The sliding seat 42 can slide relative to the base 2 when the base 2 reciprocates, and has limiting protrusions 421 extending on both sides. The limiting protrusions 421 cooperate with the limiting protrusions 421 provided on the base 2 to restrict the sliding seat 42 from leaving the base 2. The length of the limiting groove 25 extending along the movement direction of the base 2 allows the tensioning mechanism 4 to move to the tensioning mechanism 4.

[0029] Please refer to Figure 1 and 8 In this embodiment of the utility model, the base 2 includes a base plate 21 and a pad 22. The pad 22 is fixed to the bottom surface of the base plate 21. The base plate 21 is used to install the clamping mechanism 3. The pad 22 is used to support the clamped sandpaper. Usually, materials such as rubber are used to protect the sandpaper from excessive wear.

[0030] Please refer to Figure 1 In this embodiment of the present invention, the clamping component 2 32 is pivotally mounted on the base 2 and cooperates with the clamping component 1 31 to clamp the sandpaper below the base 2.

[0031] The working principle of this utility model: When assembling sandpaper onto the sander, first operate the clamping mechanisms 3 at both ends of the base 2, open the clamping components 31 and 32, insert the two ends of the sandpaper and clamp them; at this time, start the sander motor, so that the base 2 reciprocates. Due to the centrifugal force, the tensioning mechanism 4 slides from the initial position to the tensioned position, the sandpaper is stretched and tightened, the limit pawl 411 is deflected by the drive part 413, and the locking end 4111 rotates to the position against the limit boss 24, so that the tensioning mechanism 4 is kept in the tensioned position, and the sandpaper can be stably tensioned.

[0032] When it is time to replace the sandpaper, open clamping assembly 1 31 and clamping assembly 2 32, release the two ends of the clamped sandpaper, and at the same time, the unlocking protrusion 3111 on clamping assembly 1 31 rotates and pushes the unlocking end 4112 to rotate, so that the locking end 4111 moves away from the limiting protrusion 24. Then, the reset part 23 pulls the tensioning mechanism 4 from the tensioned position back to the initial position.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A sander, comprising: The main body of the sander has an output shaft that outputs torque. The base is eccentrically connected to the output shaft and is suitable for reciprocating motion along a predetermined direction under torque drive. The clamping mechanism includes a clamping component one and a clamping component two disposed at both ends of the base, for clamping sandpaper to the lower surface of the base; Its features are: A tensioning mechanism is slidably mounted on the base, and a clamping assembly is pivotally mounted on the tensioning mechanism. The tensioning mechanism has an initial position and a tensioned position; when the base reciprocates, the tensioning mechanism moves from the initial position to the tensioned position under the action of centrifugal force to tension the sandpaper.

2. The sander according to claim 1, characterized in that: The base has a limiting boss for restricting the tensioning mechanism from moving back from the tensioned position to the initial position.

3. The sander according to claim 2, characterized in that: The tensioning mechanism is pivotally mounted with a limiting component that matches the limiting boss. The limiting component includes a limiting pawl for abutting against the limiting boss to keep the tensioning mechanism in a tensioned position, a limiting shaft, and a driving part for driving the limiting pawl to abut against the limiting boss. The limiting pawl and the driving part are pivotally mounted on the tensioning mechanism via the limiting shaft.

4. The sander according to claim 3, characterized in that: The clamping assembly includes a clamping part for clamping sandpaper, a clamping shaft for supporting the tensioning mechanism, and a torsion part for driving the clamping part to clamp the sandpaper. The clamping part is provided with an unlocking protrusion that cooperates with a limiting pawl. The limiting pawl includes a locking end and an unlocking end located on opposite radial sides of the limiting shaft. When the clamping part is rotated in the direction of releasing the sandpaper, the unlocking protrusion abuts against the unlocking end, causing the limiting pawl to rotate around the limiting shaft against the action of the driving part, so that the locking end disengages from the limiting protrusion, thereby allowing the tensioning mechanism to move from the tensioned position to the initial position.

5. The sander according to claim 1, characterized in that: It also includes a reset part extending along the movement direction of the base. One end of the reset part is connected to the base, and the other end is connected to the tensioning mechanism, which is used to drive the tensioning mechanism to reset from the tensioned position to the initial position.

6. The sander according to claim 1, characterized in that: The tensioning mechanism includes a sliding seat with outwardly extending limiting protrusions on both sides. The base has a limiting groove corresponding to the limiting protrusions, and the limiting protrusions are embedded in the limiting grooves and can slide along them.

7. The sander according to claim 1, characterized in that: The base includes a base plate and a pad. The pad is fixed to the bottom surface of the base plate. The base plate is used to install the clamping mechanism, and the pad is used to support the clamped sandpaper.

8. The sander according to claim 1, characterized in that: The clamping assembly 2 is pivotally mounted on the base.

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