A manual welding pressing mechanism

Abstract

This invention provides a manual welding pressing mechanism for use in a handheld packing machine. The mechanism includes a compression spring, which engages with the upper welding assembly mounting base to press down on and return to its original position. This invention offers improved return performance for the manual welding pressing mechanism, allows coupling with the handle of the tensioning mechanism, and provides stronger pressing and lifting forces. This results in higher welding stability and more stable return performance, facilitating smooth continuous operation of the packing machine.

Description

Technical Field

[0001] This utility model relates to a handheld packing machine, specifically to a welding device used in it. Background Technology

[0002] In handheld strapping machines, PET or PP strapping tape is used to bundle products. The machine heats the two parts of the tape to be bonded through frictional heating. This requires tightening the strapping tape around the product via a tensioning mechanism, then pressing the upper welding assembly downwards to press the two parts of the tape to be bonded. The upper welding assembly is then driven to perform a welding motion, thus achieving frictional heat fusion bonding of the tape. Previously, a manual welding pressing mechanism was used, operated by pressing down and raising the handle. This mechanism had a fixed frame with a lifting element, a top head, and a top head support spring to provide cushioning during pressing down. A return spring was also installed on the outside. However, this structure requires improvement in return force to ensure stability in the final position, and the ease of operation also needs improvement. Utility Model Content

[0003] The purpose of this utility model is to provide a manual welding pressing mechanism that improves its ease of operation and stability. To this end, this utility model adopts the following technical solution: A manual welding pressing mechanism is applied to a handheld packing machine. The welding device of the handheld packing machine includes an upper welding component mounting base and an upper welding component. The upper welding component is movably connected to the upper welding component mounting base. The manual welding pressing mechanism includes a fixed frame, a lifting element, and a pressing mechanism handle. The fixed frame is provided with a guide structure for the lifting element, and the pressing mechanism handle is rotatably mounted on the fixed frame. The pressing mechanism handle is connected to a cam, which acts on the lifting element to press it down. The cam is provided with a locking part to prevent reverse rotation after pressing down the lifting element. The manual welding pressing mechanism further includes a compression spring, which cooperates with the upper welding component mounting base to press down the upper welding component mounting base and return it to its original position.

[0004] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions: The handheld packing machine is equipped with a tensioning mechanism lifting handle. The lever arm of the tensioning mechanism lifting handle is longer than that of the pressing mechanism handle. Furthermore, a cooperating mechanism is provided between the tensioning mechanism lifting handle and the pressing mechanism handle. During the lifting stroke of the tensioning mechanism lifting handle, after the tensioning mechanism lifting handle is lifted to a certain angle, it can drive the pressing mechanism handle to lift, causing the locking part of the cam that prevents reverse loosening to pass over the cooperating part, and continue to rotate to the initial position under the drive of the reset elastic force.

[0005] The handheld packing machine is equipped with a sensor, which is a limit switch. When the handle of the pressing mechanism is driven to automatically rotate to the initial position by the elastic force, the limit switch is pressed down. When the handle of the pressing mechanism is pressed down, the limit switch is released, providing a signal for controlling the welding motor.

[0006] A sensor is provided on the side of the lifting element to move up and down with it. A slot is provided on the fixed frame for the sensing element to extend out. The manual welding pressing mechanism is equipped with a sensor that cooperates with the sensing element. The sensor is located in the middle of the handheld packing machine, senses the position of the pressing mechanism, and provides a signal to control the welding motor.

[0007] The cam is coaxially connected to the handle of the pressing mechanism and rotates synchronously.

[0008] The mating mechanism includes a lever eccentrically mounted on the lifting handle of the tensioning mechanism and a mating part on the pressing mechanism handle, or a mating element provided on the pressing mechanism handle, or a mating element provided on the cam, or a mating element coaxially connected to the pressing mechanism handle. In the fusion state, the mating part or mating element is located on the rotation path of the lever and is spaced apart from the lever on the rotation path. The mating element is provided on the outside of the fixed frame through an axial extension structure, located beside the rotation path of the lifting handle of the tensioning mechanism.

[0009] The upper end of the lifting element is provided with a roller, and the cam cooperates with the roller.

[0010] The lifting element is cylindrical, with a compression spring mounting cavity at its lower part. The compression spring mounting cavity can hold the compression spring and expose its lower end. The compression spring mounting cavity is designed to support the bottom of the compression spring. The upper part of the lifting element is provided with a part that connects to the roller shaft, and the top of the lifting element is provided with a cam clearance groove.

[0011] The upper welding assembly mounting base is provided with a reset spring, which can lift the upper welding assembly mounting base upward when the locking part of the cam that prevents reverse rotation rotates past the component it is engaged with when the lower pressing mechanism handle is reset and rotated to the reset position. Together with the compression spring, the upper welding assembly mounting base provides a reset spring force to the lower pressing mechanism handle.

[0012] Due to the adoption of the technical solution of this utility model, the manual welding pressing mechanism has better reset performance, can be coupled with the handle of the tensioning mechanism, and has stronger pressing and lifting reset forces. It not only has higher welding stability, but also more stable reset performance, which facilitates the smooth continuous operation of the packaging machine. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention in the state of placing or taking out the packing strap (handle raised).

[0014] Figure 2 This is a schematic diagram of Embodiment 1 of the present invention in the welding state.

[0015] Figure 3 This is a cross-sectional view of Embodiment 1 of the present invention in the state of placing or taking out the packing strap (handle raised).

[0016] Figure 4 This is a cross-sectional view of Embodiment 1 of the present invention in the fusion state.

[0017] Figure 5 This is an exploded view of a portion of the structure of Embodiment 1 of this utility model.

[0018] Figure 6 This is a schematic diagram of Embodiment 2 of the present invention in the state of placing or taking out the packing strap (handle raised).

[0019] Figure 7 This is a schematic diagram of Embodiment 2 of the present invention in the welding state.

[0020] Figure 8 This is a cross-sectional view of Embodiment 2 of the present invention in the state of placing or taking out the packing strap (handle raised).

[0021] Figure 9 This is a cross-sectional view of Embodiment 2 of the present invention in the fusion state.

[0022] Figure 10 This is an exploded view of a portion of the structure of Embodiment 2 of this utility model.

[0023] Figure 11 This is a schematic diagram of Embodiment 2 of the present invention viewed from another angle. Detailed Implementation

[0024] See attached document Figure 1-5The handheld packing machine includes a welding device and a tensioning mechanism 300. The welding device includes a drive motor 200, an upper welding component mounting base 201, and an upper welding component 202. The upper welding component 202 is movably connected to the upper welding component mounting base 201. Reference numeral 203 indicates the lower welding component. In this invention, the tensioning mechanism, the upper welding component, the mounting method of the upper welding component, the welding motion drive structure, and the lower welding component are not changed; all these mechanisms can adopt existing technologies.

[0025] The aforementioned manual welding pressing mechanism is applied to a handheld packing machine. The manual welding pressing mechanism includes a fixed frame 1, a lifting element 2, and a pressing mechanism handle 3. The fixed frame 1 has a guide structure for the lifting element 2, which in this embodiment is a guide hole 11. The pressing mechanism handle 3 is rotatably mounted on the fixed frame 1. The pressing mechanism handle 3 is connected to a cam 4, which acts on the lifting element 2 to press it down. The cam 4 has a locking part 41, such as a groove, to prevent reverse rotation after pressing down the lifting element. The manual welding pressing mechanism also includes a compression spring 5. The compression spring 5 cooperates with the upper welding assembly mounting base 201 to press down the upper welding assembly mounting base 201 and return it to its original position. The compression spring directly provides the reset drive, which can provide a greater reset force, allowing the lifting element 2 and the pressing mechanism handle 3 to return to their initial position more sensitively and repeatably. Figure 1 , 3 The position. Furthermore, the force exerted by the downward pressure on the upper welding assembly mounting base 201 is also stronger.

[0026] The upper welding assembly mounting base 201 is also provided with a reset spring 204. When the lower pressing mechanism handle is reset and rotated to the point where the locking part of the cam 4, which prevents reverse rotation, rotates past the cooperating part, the upper welding assembly mounting base 201 is pushed upward. During the lifting stroke, it provides a reset spring force to the lower pressing mechanism handle 3 together with the compression spring 5. At the beginning of the reset, the reset spring 204 can be combined to increase the reset force, enable the reset to start quickly, and increase the reset speed, so that the two different movements of the lower pressing mechanism handle 3 lifting and the upper welding assembly mounting base 201 lifting can be coupled.

[0027] The handheld packing machine is equipped with a tensioning mechanism lifting handle 301. Reference numeral 303 indicates the shaft of the tensioning mechanism lifting handle 301. The lever arm of the tensioning mechanism lifting handle 301 is longer than the lever arm of the pressing mechanism handle 3. Furthermore, a cooperating mechanism is provided between the tensioning mechanism lifting handle 301 and the pressing mechanism handle 3. During the lifting stroke of the tensioning mechanism lifting handle 301, after lifting it to a certain angle, it can drive the pressing mechanism handle 3 to begin lifting, causing the locking part 41 of the cam 4, which prevents reverse rotation, to pass over its cooperating component and continue to rotate to its initial position under the drive of the reset elastic force. This not only allows the pressing mechanism to be locked during welding but also enables automatic and accurate reset through combinations of different mechanisms during reset.

[0028] The cam 4 is coaxially connected to the pressing mechanism handle 3 and rotates synchronously. Alternatively, the pressing mechanism handle 3 can be connected to the cam 4, and the cam 4 can be connected to the shaft 40.

[0029] The mating mechanism includes a lever 302 eccentrically mounted on the lifting handle 301 of the tensioning mechanism and a mating part on the pressing handle 3. The mating part is positioned on the rotation path of the lever 302 and spaced apart from the lever 302 in the rotation path when the lever 302 is in the welding state due to the axial extension of the lever 302.

[0030] The upper end of the lifting element 2 is provided with a roller 20 as a cooperating part with the cam 4, and the cam 4 cooperates with the roller 20.

[0031] The lifting element 2 is columnar, with a compression spring mounting cavity 21 at its lower part. The compression spring mounting cavity 21 can hold the compression spring 5 and expose its lower end. The compression spring mounting cavity 21 is provided with a top 22 that can support the compression spring 5. The upper part of the lifting element 2 is provided with a part 23 that connects to the roller shaft. The top of the lifting element 2 is provided with a cam clearance groove 24.

[0032] The handheld packing machine is equipped with sensor 7, which provides a signal for controlling the welding motor. In this embodiment, sensor 7 is a limit switch. When the handle 3 of the pressing mechanism is automatically rotated to the initial position by the elastic force, the limit switch is pressed down (see...). Figure 3 When the handle 3 of the pressing mechanism is pressed down, the limit switch is released to provide a signal for controlling the welding motor, such as providing a reference signal for delaying the start of the welding motor.

[0033] Reference Figures 6-11In this embodiment, a preferred solution is provided for placing the sensor 7 in the middle of the handheld packing machine, where it is not suitable to place the sensor 7 at the top. A sensing element 25, which moves up and down with the lifting element, is provided on the side of the lifting element 2. This sensing element 25 can be an extension of the roller shaft. A slot 12 is provided on the fixing frame 1 for the sensing element 25 to extend out. The manual welding pressing mechanism is equipped with a sensor that cooperates with the sensing element 25. The sensor is located in the middle of the handheld packing machine, senses the position of the pressing mechanism, and provides a signal for controlling the welding motor.

[0034] For the aforementioned mating structure, this embodiment adopts the following structure: The mating mechanism includes a lever 302 eccentrically mounted on the lifting handle 301 of the tensioning mechanism and a mating element 6 coaxially connected to the pressing mechanism handle. In the fusion state, the mating element 6 is located on the rotation path of the lever 302 and is spaced apart from the lever 302. The mating element 6 is disposed on the outside of the fixing frame 1 by connecting to the end of the axial extension structure (shaft 40), located beside the rotation path of the lifting handle 301 of the tensioning mechanism. In the fusion state, the mating element 6 is located on the rotation path of the lever 302 and is spaced apart from the lever 302 in the rotation path.

[0035] exist Figures 6-11 Chinese figure labels and Figures 1-5 The same means the same thing.

[0036] Unless otherwise specified, in this utility model, terms such as "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "axial" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0037] Unless otherwise expressly specified and limited, the terms "set," "clamped," and "connected" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the protection scope of the present utility model.

Claims

1. A manual welding pressing mechanism, applied to a handheld packing machine, wherein the welding device of the handheld packing machine includes an upper welding component mounting base and an upper welding component, the upper welding component being movably connected to the upper welding component mounting base, the manual welding pressing mechanism including a fixed frame, a lifting element, and a pressing mechanism handle, the fixed frame being provided with a guide structure for the lifting element, and the pressing mechanism handle being rotatably mounted on the fixed frame; the pressing mechanism handle is connected to a cam, the cam acting on the lifting element to press it down, and the cam being provided with a locking part to prevent reverse rotation after pressing down the lifting element; characterized in that... The manual welding pressing mechanism also includes a compression spring, which cooperates with the upper welding assembly mounting base to press down the upper welding assembly mounting base and return it to its original position.

2. A manual fusion downforce mechanism as claimed in claim 1, characterised in that, The handheld packing machine is equipped with a tensioning mechanism lifting handle. The lever arm of the tensioning mechanism lifting handle is longer than that of the pressing mechanism handle. Furthermore, a cooperating mechanism is provided between the tensioning mechanism lifting handle and the pressing mechanism handle. During the lifting stroke of the tensioning mechanism lifting handle, after the tensioning mechanism lifting handle is lifted to a certain angle, it can drive the pressing mechanism handle to lift, causing the locking part of the cam that prevents reverse loosening to pass over the cooperating part, and continue to rotate to the initial position under the drive of the reset elastic force.

3. A manual fusion downforce mechanism as claimed in claim 2, wherein, The handheld packing machine is equipped with a sensor, which is a limit switch. When the handle of the pressing mechanism is driven to automatically rotate to the initial position by the elastic force, the limit switch is pressed down. When the handle of the pressing mechanism is pressed down, the limit switch is released, providing a signal for controlling the welding motor.

4. A manual downweld mechanism as claimed in claim 2, wherein, A sensor is provided on the side of the lifting element to move up and down with it. A slot is provided on the fixed frame for the sensing element to extend out. The manual welding pressing mechanism is equipped with a sensor that cooperates with the sensing element. The sensor is located in the middle of the handheld packing machine, senses the position of the pressing mechanism, and provides a signal to control the welding motor.

5. A manual fusion downforce mechanism as claimed in claim 1, wherein, The cam is coaxially connected to the handle of the pressing mechanism and rotates synchronously.

6. A manual welding pressing mechanism as described in claim 2, characterized in that, The mating mechanism includes a lever eccentrically mounted on the lifting handle of the tensioning mechanism and a mating part on the pressing mechanism handle, or a mating element provided on the pressing mechanism handle, or a mating element provided on the cam, or a mating element coaxially connected to the pressing mechanism handle. In the fusion state, the mating part or mating element is located on the rotation path of the lever and is spaced apart from the lever on the rotation path. The mating element is provided on the outside of the fixed frame through an axial extension structure, located beside the rotation path of the lifting handle of the tensioning mechanism.

7. A manual downweld mechanism as claimed in claim 2, wherein, The upper end of the lifting element is provided with a roller, and the cam cooperates with the roller.

8. A manual downweld mechanism as claimed in claim 1, wherein, The lifting element is cylindrical, with a compression spring mounting cavity at its lower part. The compression spring mounting cavity can hold the compression spring and expose its lower end. The compression spring mounting cavity is designed to support the bottom of the compression spring. The upper part of the lifting element is provided with a part that connects to the roller shaft, and the top of the lifting element is provided with a cam clearance groove.

9. A manual downweld mechanism as claimed in claim 1, wherein, The upper welding assembly mounting base is provided with a reset spring, which can lift the upper welding assembly mounting base upward when the locking part of the cam that prevents reverse rotation rotates past the component it is engaged with when the lower pressing mechanism handle is reset and rotated to the reset position. Together with the compression spring, the upper welding assembly mounting base provides a reset spring force to the lower pressing mechanism handle.

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