A kind of tensioner for printing all-in-one machine

Abstract

The utility model bar code detection machine technical field relates to especially a kind of tensioner for printing all-in-one machine. Including connecting rod axle, the both ends of connecting rod axle are rotatably connected with torsion subassembly, at least two groups of arc spring piece along the axis of connecting rod axle distribution are connected between two torsion subassembly, the knob subassembly is used to drive the arc spring piece forms first state and second state, when the arc spring piece is in first state, the arc spring piece forms distortion state relative to connecting rod axle;When the arc spring piece is in second state, the arc spring piece forms relaxed expansion state relative to connecting rod axle, the highest point of the arc spring piece is away from the connecting rod axle. It solves the problem that printing all-in-one machine paper winding installation efficiency is low, and the reliability of tensioner is insufficient.

Description

Technical Field

[0001] This invention relates to the technical field of barcode inspection machines, and in particular to a tensioning device for an all-in-one printer. Background Technology

[0002] All-in-one printers that combine barcode detection and printing functions are widely used in logistics, retail, and other scenarios. These printers are typically equipped with a roll-to-roll paper mounting structure, and a tensioning device is needed to position and secure the paper roll to ensure smooth paper transport during printing. Currently, most all-in-one printers use manually adjustable roll tension mounting brackets, which achieve tension through the cooperation of elastic components and support shafts. However, existing tensioning devices have problems: First, the tensioning operation is cumbersome, requiring multiple adjustments to allow the elastic components to clamp the paper core, which is time-consuming when installing and changing rolls, affecting work efficiency; Second, the reliability of maintaining the tension state is insufficient, and some devices lack a stable positioning structure, making it easy for the elastic components to reset due to vibration during roll rotation, causing the roll to loosen.

[0003] Therefore, a tensioning device that is easy to operate, has a stable tension state, and precise reset limit is needed to solve the problems of insufficient efficiency in paper roll installation and insufficient tensioning reliability of existing devices. Utility Model Content

[0004] To address the issues of low paper roll installation efficiency and insufficient reliability of tensioning devices, this utility model provides a tensioning device for all-in-one printers.

[0005] This utility model provides a tensioning device for a multi-function printer, including a connecting shaft. Torsion components are rotatably connected to both ends of the connecting shaft. At least two sets of arc-shaped elastic plates distributed along the axis of the connecting shaft are connected between the two torsion components. The torsion components drive the arc-shaped elastic plates to form a first state and a second state. When the arc-shaped elastic plate is in the first state, it is in a torsional state relative to the connecting shaft. When the arc-shaped elastic plate is in the second state, it is in a stretched and expanded state relative to the connecting shaft, with the highest point of the arc-shaped elastic plate being far away from the connecting shaft.

[0006] Furthermore, a torsion spring is sleeved on the connecting rod shaft, and the two ends of the torsion spring are respectively fixedly connected to the torsion assemblies at both ends of the connecting rod shaft. The torsion spring provides torsional force for the arc-shaped elastic plate to reset from the first state to the second state. Furthermore, limit brackets are fixedly installed at both ends of the connecting rod shaft. The limit brackets are arranged adjacent to the torsion assembly. The limit brackets are used to limit the arc-shaped elastic sheet to achieve limiting compression of the arc-shaped elastic sheet in the first state and maintain the supporting force of the arc-shaped elastic sheet on the printing paper roll.

[0007] Furthermore, the limiting bracket includes a connecting ring and right-angle arms. The connecting ring is fixed on the connecting rod shaft. There are at least two right-angle arms, which are disposed on the connecting ring corresponding to the arc-shaped elastic plate. The right-angle arms extend toward the highest point of the arc of the arc-shaped elastic plate and abut against the arc-shaped elastic plate. Furthermore, the diameter of the circle containing the highest point of the arc-shaped elastic sheet is greater than the diameter of the circle containing the right-angle arm, and the right-angle arm is used to limit the maximum deformation position of the arc-shaped elastic sheet when it is in the second state. Furthermore, the limiting bracket includes a connecting ring and a cylindrical limiting cylinder. The connecting ring is fixed on the connecting rod shaft, and there are two limiting cylinders, which are respectively fixedly installed on the connecting rings at both ends of the connecting rod shaft. The end of the limiting cylinder facing the highest point of the arc of the arc elastic sheet abuts against the arc elastic sheet.

[0008] Furthermore, the torsion assembly includes an inner sleeve component and an outer sleeve component. The inner sleeve component is rotatably connected to the end of the connecting rod shaft, and the outer sleeve component is sleeved on the outside of the inner sleeve. The outer sleeve component can move along the axial direction of the inner sleeve. The connecting ring is provided with a stop component, and the outer sleeve component is provided with a check component corresponding to the stop component. Pulling out the outer sleeve component and rotating it, and then pressing it back into the outer sleeve component can cause the check component to engage with the stop component to restrict the elastic plate from resetting. After pulling out the outer sleeve component, the check component disengages from the stop component, and the elastic plate resets under the action of the torsion spring.

[0009] Furthermore, the inner sleeve is provided with a first limiting part, and the outer sleeve is provided with a second limiting part that is adapted to the first limiting part. Through the cooperation of the first limiting part and the second limiting part, the inner sleeve is driven to rotate synchronously when the outer sleeve rotates. Furthermore, the first limiting part and the second limiting part are alternating convex and concave structures.

[0010] Furthermore, the arc-shaped elastic sheet includes two elastic sheet units, which are arranged opposite each other with the connecting rod axis as the axis of symmetry. The elastic sheet units are fixedly connected to the inner sleeve of the torsion assembly, and the inner sleeve rotates to drive the elastic sheet units to torsion deformation. In summary, this utility model has the following beneficial technical effects: 1. This utility model significantly improves the efficiency of roll paper installation and replacement. Through the linkage structure of the torsion component and the arc-shaped elastic piece, roll paper installation is achieved in a single step. Utilizing the alternating convex and concave engagement of the first and second limiting parts of the inner and outer sleeve components, simply pulling and rotating the outer sleeve component simultaneously twists the inner sleeve component and the arc-shaped elastic piece fixed thereto into a twisted state, facilitating quick insertion of the printing paper core. After releasing the outer sleeve component, the torsion force of the torsion spring directly drives the arc-shaped elastic piece to return to its expanded state, completing tensioning and positioning without multiple adjustments. Compared to the cumbersome multi-step adjustment method of existing devices, this significantly reduces the time spent on roll paper installation and replacement, effectively improving the operating efficiency of the all-in-one printer.

[0011] 2. The limiting brackets at both ends of the connecting rod shaft of this utility model abut against the arc-shaped elastic sheet through right-angle arms or cylindrical limiting cylinders. This can form effective support when the arc-shaped elastic sheet is in a stretched and expanded state. Combined with the uniform force exerted on the paper roll by the symmetrically arranged elastic sheet units, the structural stability during the tensioning process is further guaranteed, and the loosening of the paper roll during printing is avoided from affecting the transmission accuracy.

[0012] 3. The torsion spring of this utility model provides a stable and controllable reset torsional force for the arc-shaped elastic sheet, so that the state switching of the elastic sheet is always within the controllable range. The design of at least two sets of arc-shaped elastic sheets distributed along the axis of the connecting rod can adapt to paper rolls of different diameters to a certain extent, thus improving the versatility of the device. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the tensioning device for a multi-function printer according to Embodiment 1 of this utility model.

[0014] Figure 2 This is a front view of the tensioning device for a multi-function printer according to Embodiment 1 of this utility model.

[0015] Figure 3 This is a top view of the tensioning device for a multi-function printer according to Embodiment 1 of this utility model.

[0016] Figure 4 This is Embodiment 1 of the present utility model. Figure 1 A magnified view of part A in the image.

[0017] Figure 5 This is a schematic diagram of the tensioning device for a multi-function printer according to Embodiment 2 of this utility model.

[0018] Figure 6 This is a usage scenario diagram of the tensioning device for a multi-function printer in this embodiment.

[0019] Among them, 1. connecting rod shaft; 2. torsion assembly; 201. inner sleeve component; 202. outer sleeve component; 203. check valve component; 204. first limiting part; 205. second limiting part; 3. arc-shaped elastic plate; 4. torsion spring; 5. limiting bracket; 501. connecting ring; 502. stop component; 503. right angle arm; 504. limiting cylinder; 6. paper roll. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1 Reference Figure 1 and Figure 6 This embodiment provides a tensioning device for a multi-function printer, including a connecting shaft 1. The connecting shaft 1 serves as the core support base of the device, its shaft body supporting a paper roll 6. An axial limiting protrusion is provided on the shaft body corresponding to the mounting position of the torsion spring 4 to prevent the torsion spring 4 from shifting along the axis of the connecting shaft 1. Torsion components 2 are rotatably connected to both ends of the connecting shaft 1, and the torsion components 2 at both ends are symmetrically distributed, forming synchronous driving support for the arc-shaped elastic plates 3. At least two sets of arc-shaped elastic plates 3 distributed along the axis of the connecting shaft 1 are connected between the two torsion components 2. Multiple sets of arc-shaped elastic plates 3 are arranged at intervals along the axial direction of the connecting shaft 1, providing uniform support for paper rolls 6 of different diameters. The rotating assembly 2 drives the arc-shaped elastic sheet 3 to form a first state and a second state. The mechanical linkage of the rotating assembly 2 enables the arc-shaped elastic sheet 3 to switch between the two states. In the first state, the arc-shaped elastic sheet 3 is in a torsional state relative to the connecting rod shaft 1, at which point the elastic sheet undergoes elastic deformation, and its arc-shaped contour contracts towards the connecting rod shaft 1. In the second state, the arc-shaped elastic sheet 3 is in an expanded state relative to the connecting rod shaft 1, and the highest point of the arc-shaped elastic sheet 3 is far away from the connecting rod shaft 1. At this point, the elastic sheet returns to its natural expanded shape, and support is achieved through the tight fit between the arc-shaped surface and the inner wall of the paper roll 6. The arc-shaped elastic sheet 3 can be made of steel, and its contact with the inner wall of the roll is a line contact. The line contact surface can be provided with anti-slip textures.

[0022] Reference Figure 2 A torsion spring 4 is sleeved on the connecting rod shaft 1. The torsion spring 4 has a helical torsion structure and is sleeved between the connecting rod shaft 1 and the inner sleeve component 201 of the torsion assembly 2. The two ends of the torsion spring 4 are respectively fixedly connected to the torsion assembly 2 at both ends of the connecting rod shaft 1. The two ends of the torsion spring 4 are fixedly connected to the inner sleeve component 201 of the torsion assembly 2. The torsion spring 4 provides torsional force for the arc-shaped elastic plate 3 to reset from the first state to the second state. When the torsion assembly 2 releases the torsional constraint on the arc-shaped elastic plate 3, the torsion spring 4 releases the pre-stored elastic potential energy and drives the inner sleeve component 201 to rotate in the opposite direction to drive the elastic plate to reset.

[0023] Limiting brackets 5 are fixedly installed at both ends of the connecting rod shaft 1. The limiting brackets 5 are rigidly connected to the connecting rod shaft 1, forming a mechanical limiting reference for the arc-shaped elastic sheet 3. The limiting brackets 5 are arranged adjacent to the torsion component 2, and a gap is reserved between them for the rotation of the torsion component 2 to avoid motion interference. The limiting brackets 5 are used to limit the arc-shaped elastic sheet 3 to achieve limiting compression of the arc-shaped elastic sheet 3 in the second state. The excessive deformation of the elastic sheet is limited by physical contact, maintaining the supporting force of the arc-shaped elastic sheet 3 on the printing paper roll, and ensuring stable contact between the elastic sheet and the inner wall of the roll under tension. Reference Figure 2 and Figure 3 The limiting bracket 5 includes a connecting ring 501 and a right-angle arm 503. The connecting ring 501 is fixed to the connecting rod shaft 1. The connecting ring 501 is fixed to the connecting rod shaft 1 by interference fit or set screw to achieve circumferential and axial positioning. There are at least two right-angle arms 503, which are corresponding to the arc-shaped elastic pieces 3 and are provided on the connecting ring 501. The right-angle arms 503 and the connecting ring 501 are integrally formed. Their number is consistent with the number of individual elastic pieces in each group of arc-shaped elastic pieces 3. The right-angle arms 503 extend towards the highest point of the arc of the arc-shaped elastic piece 3 and abut against the arc-shaped elastic piece 3. The end of the right-angle arm 503 may be provided with an arc-shaped transition surface to match the arc-shaped surface of the elastic piece and reduce local wear during contact. Reference Figure 2 The diameter of the circle containing the highest point of the arc-shaped elastic sheet 3 is greater than the diameter of the circle containing the right-angle arm 503. This dimensional relationship ensures that the elastic sheet can extend beyond the right-angle arm 503 to form effective support in the second state, while avoiding interference between the two in the first state. The right-angle arm 503 is used to limit the maximum deformation position of the arc-shaped elastic sheet 3 in the second state. The rigid support of the right-angle arm 503 blocks the further expansion of the elastic sheet and prevents it from being damaged due to excessive deformation.

[0024] Reference Figure 4The torsion assembly 2 includes an inner sleeve component 201 and an outer sleeve component 202. The inner sleeve component 201 is rotatably connected to the end of the connecting rod shaft 1. The inner sleeve component 201 cooperates with the connecting rod shaft 1 through a bearing or sliding bushing to achieve low-friction rotation. The outer sleeve component 202 is sleeved on the outside of the inner sleeve. The inner wall of the outer sleeve component 202 is clearance-fitted with the outer wall of the inner sleeve component 201 to provide space for axial movement. The outer sleeve can move axially along the inner sleeve. The outer surface of the outer sleeve component 202 is provided with anti-slip textures to facilitate the operator's grip and application of force. The connecting ring 501 is provided with a stop component 502. Component 502 has a protruding structure. The outer sleeve is provided with a check component 203 corresponding to the stop component 502. The check component 203 has a protruding structure and its outline is adapted to the stop component 502. Pulling out the outer sleeve and rotating it, and then pressing the outer sleeve back in, can make the check component 203 engage with the stop component 502. The mechanical engagement of the two forms a circumferential lock to limit the return of the elastic piece, so that the arc-shaped elastic piece 3 is stably maintained in a twisted clamping state. After pulling out the outer sleeve, the check component 203 disengages from the stop component 502, the locking state is released, and the elastic piece is reset under the action of the torsion spring 4, realizing automatic state switching. Reference Figure 4 The inner sleeve is provided with a first limiting part 204, which extends along the axial direction of the inner sleeve component 201 and is distributed on the outer circumferential surface of the inner sleeve. The outer sleeve is provided with a second limiting part 205 that is adapted to the first limiting part 204. The second limiting part 205 is provided on the inner circumferential surface of the outer sleeve component 202 and corresponds one-to-one with the first limiting part 204. Through the cooperation of the first limiting part 204 and the second limiting part 205, the inner sleeve is driven to rotate synchronously when the outer sleeve rotates, ensuring that the rotational torque of the outer sleeve can be completely transmitted to the inner sleeve, thereby driving the elastic sheet to deform. The first limiting part 204 and the second limiting part 205 are alternating convex and concave structures. The sides of the convex and concave parts are fitting guide surfaces, which can transmit torque without affecting the axial movement of the outer sleeve along the inner sleeve. The arc-shaped elastic sheet 3 includes two elastic sheet units, which are arranged opposite each other with the connecting rod shaft 1 as the axis of symmetry. The symmetrical layout makes the paper roll 6 subjected to balanced force and avoids skewing. The elastic sheet unit is fixedly connected to the inner sleeve of the torsion component 2. The connection method is welding or integral molding to ensure reliable force transmission. The rotation of the inner sleeve drives the elastic sheet unit to torsion deformation. The circumferential rotation of the inner sleeve is converted into the torsional deformation force of the elastic sheet unit, realizing the state switching. Workflow: The tensioning device uses the connecting shaft 1 as its core support. Through the "axial movement-circumferential rotation-axial reset" action of the torsion component 2, the arc-shaped elastic plate 3 is driven to switch states under the synergistic action of the torsion spring 4 and the limiting bracket 5: In the initial state, the torsion spring 4 is in a naturally relaxed state, and the arc-shaped elastic plate 3 is in a stretched and expanded state (second state), with the right-angle arm 503 limiting its maximum deformation; when paper needs to be installed, the torsion component 2 drives the elastic plate to twist to a tortuous state (first state), and the check component 203 and the stop component 502 engage and lock; after the paper is installed, the locking is released, and the torsion spring 4 drives the elastic plate to reset and tension the roll; during printing, the limiting bracket 5 maintains the supporting force of the elastic plate to ensure stable rotation of the roll; the above state switching process is repeated when changing the paper. Operating steps: Paper roll installation preparation: The operator holds the outer sleeve 202 of the torsion assembly 2 and pulls it outward along the axial direction of the inner sleeve 201, so that the check valve 203 on the outer sleeve is disengaged from the stop valve 502 on the connecting ring 501, and the locking state is released. Drive the elastic sheet deformation: Keep the outer sleeve in the pulled-out state, rotate the outer sleeve component 202 in the circumferential direction, and drive the inner sleeve component 201 to rotate synchronously through the convex and concave cooperation of the first limiting part 204 and the second limiting part 205. The inner sleeve drives the elastic sheet individual units symmetrical at both ends to twist, so that the arc-shaped elastic sheet 3 switches from the stretched and expanded state (second state) to the twisted state (first state). Locking tension state: Keep the rotation position of the outer sleeve unchanged, press the outer sleeve component 202 back inward along the inner sleeve axis, so that the check component 203 engages with the stop component 502 at the corresponding position, and achieve circumferential locking. At this time, the arc-shaped elastic piece 3 is stably kept in a twisted state. Install the paper roll 6: Insert the paper roll 6 along the axis of the connecting rod shaft 1 so that the inner wall of the roll corresponds to the arc-shaped elastic piece 3 in a twisted state; Tensioning the roll: Pull out the outer sleeve 202 along the axial direction again, the check 203 and the stop 502 disengage, the torsion spring 4 releases its elastic potential energy, drives the inner sleeve 201 to rotate in the opposite direction, and drives the elastic sheet to return to the expanded state (second state) until the elastic sheet and the right angle arm 503 come into contact. At this time, the highest point of the elastic sheet's arc supports the inner wall of the paper roll 6, completing the tensioning and positioning. Paper roll replacement operation: Repeat steps 1-3 to switch the curved elastic piece 3 to the twisted state, then remove the old roll. Then install the new roll and complete the tensioning according to steps 4-5.

[0025] Example 2 Reference Figure 5 and Figure 6The difference between this embodiment and Embodiment 1 is that this embodiment provides another limiting bracket 5 structure. The limiting bracket 5 includes a connecting ring 501 and a cylindrical limiting cylinder 504. The connecting ring 501 is fixed to the connecting rod shaft 1 and forms a rigid connection with the connecting rod shaft 1 through an interference fit or a set screw. The end face of the connecting ring 501 facing the arc-shaped elastic piece 3 is provided with a mounting groove or a connecting protrusion to provide a fixing reference for the limiting cylinder 504. There are two limiting cylinders 504, which are respectively fixedly installed on both sides of the connecting rod shaft 1. On the connecting ring 501 at the end, two limiting cylinders 504 are symmetrically distributed along the axis of the connecting rod shaft 1, and correspond one-to-one with the two individual elastic plates of each set of arc-shaped elastic plates 3 to form precise limiting. The end of the limiting cylinder 504 facing the highest point of the arc of the arc-shaped elastic plate 3 abuts against the arc-shaped elastic plate 3. The limiting cylinder 504 is a hollow or solid cylindrical structure, and its end away from the connecting ring 501 is provided with an arc-shaped transition surface. This transition surface is adapted to the arc-shaped surface of the arc-shaped elastic plate 3, which can reduce local wear and stress concentration during contact. The cylindrical limiting cylinder 504 and the connecting ring 501 are integrally formed or fixed by welding, threaded connection or other means to ensure the structural strength of the connection between the two. The axial length of the limiting cylinder 504 is set according to the deformation range of the arc-shaped elastic piece 3. The diameter of the circle where the end away from the connecting ring 501 is located is smaller than the diameter of the circle where the highest point of the arc of the arc-shaped elastic piece 3 is located. This dimensional relationship ensures that the arc-shaped elastic piece 3 can extend beyond the end of the limiting cylinder 504 to form effective support when it is in the second state. At the same time, it can limit the maximum deformation position of the elastic piece by end contact during the reset process, so as to avoid elastic failure caused by excessive deformation. The limiting bracket 5 is arranged adjacent to the torsion component 2, and a gap is reserved between them for the rotation of the torsion component 2 and the deformation of the arc-shaped elastic sheet 3 to prevent motion interference. The outer peripheral surface of the limiting cylinder 504 is kept in a non-contact state with the inner surface of the arc-shaped elastic sheet 3. The limiting is achieved only through the end when the arc-shaped elastic sheet 3 is in the second state. This does not affect the torsional deformation of the elastic sheet, but can provide stable support in the tensioned state and maintain the supporting force of the arc-shaped elastic sheet 3 on the printing paper roll.

[0026] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A tensioning device for an all-in-one printer, characterized in that, The system includes a connecting rod shaft (1), with torsion components (2) rotatably connected to both ends of the connecting rod shaft (1). At least two sets of arc-shaped elastic plates (3) distributed along the axis of the connecting rod shaft (1) are connected between the two torsion components (2). The torsion components (2) are used to drive the arc-shaped elastic plates (3) to form a first state and a second state. When the arc-shaped elastic plate (3) is in the first state, it is in a torsional state relative to the connecting rod shaft (1). When the arc-shaped elastic plate (3) is in the second state, it is in a stretched and expanded state relative to the connecting rod shaft (1), and the highest point of the arc-shaped elastic plate (3) is far away from the connecting rod shaft (1).

2. The tensioning device for a multi-function printer according to claim 1, characterized in that, A torsion spring (4) is sleeved on the connecting rod shaft (1). The two ends of the torsion spring (4) are respectively fixedly connected to the torsion assembly (2) at both ends of the connecting rod shaft (1). The torsion spring (4) provides torsional force for the arc-shaped elastic plate (3) to reset from the first state to the second state.

3. The tensioning device for a multi-function printer according to claim 1, characterized in that, Limiting brackets (5) are fixedly installed at both ends of the connecting rod shaft (1). The limiting brackets (5) are arranged adjacent to the torsion assembly (2). The limiting brackets (5) are used to limit the arc-shaped elastic sheet (3) so as to achieve limiting compression of the arc-shaped elastic sheet (3) in the first state and maintain the supporting force of the arc-shaped elastic sheet (3) on the printing paper roll.

4. The tensioning device for a multi-function printer according to claim 3, characterized in that, The limiting bracket (5) includes a connecting ring (501) and a right-angle arm (503). The connecting ring (501) is fixed on the connecting rod shaft (1). There are at least two right-angle arms (503) and they are arranged on the connecting ring (501) in correspondence with the arc-shaped elastic plate (3). The right-angle arms (503) extend toward the highest point of the arc of the arc-shaped elastic plate (3) and abut against the arc-shaped elastic plate (3).

5. The tensioning device for a multi-function printer according to claim 4, characterized in that, The diameter of the circle containing the highest point of the arc-shaped elastic sheet (3) is greater than the diameter of the circle containing the right-angle arm (503). The right-angle arm (503) is used to limit the maximum deformation position of the arc-shaped elastic sheet (3) when it is in the second state.

6. The tensioning device for a multi-function printer according to claim 3, characterized in that, The limiting bracket (5) includes a connecting ring (501) and a cylindrical limiting cylinder (504). The connecting ring (501) is fixed on the connecting rod shaft (1). There are two limiting cylinders (504) and they are respectively fixedly installed on the connecting rings (501) at both ends of the connecting rod shaft (1). The end of the limiting cylinder (504) facing the highest point of the arc of the arc elastic piece (3) abuts against the arc elastic piece (3).

7. The tensioning device for a multi-function printer according to any one of claims 5 or 6, characterized in that, The torsion assembly (2) includes an inner sleeve component (201) and an outer sleeve component (202). The inner sleeve component (201) is rotatably connected to the end of the connecting rod shaft (1). The outer sleeve component (202) is sleeved on the outside of the inner sleeve and can move along the axial direction of the inner sleeve. The connecting ring (501) is provided with a stop component (502). The outer sleeve is provided with a check component (203) corresponding to the stop component (502). Pull out the outer sleeve and rotate it, then press the outer sleeve back to make the check component (203) engage with the stop component (502) to limit the elastic plate from resetting. After pulling out the outer sleeve, the check component (203) disengages from the stop component (502), and the elastic plate resets under the action of the torsion spring (4).

8. The tensioning device for a multi-function printer according to claim 7, characterized in that, The inner sleeve is provided with a first limiting part (204), and the outer sleeve is provided with a second limiting part (205) that is adapted to the first limiting part (204). Through the cooperation of the first limiting part (204) and the second limiting part (205), the inner sleeve is driven to rotate synchronously when the outer sleeve rotates.

9. The tensioning device for a multi-function printer according to claim 8, characterized in that, The first limiting part (204) and the second limiting part (205) are alternating convex and concave structures.

10. The tensioning device for a multi-function printer according to claim 9, characterized in that, The arc-shaped elastic sheet (3) includes two elastic sheet units. The two elastic sheet units are arranged opposite each other with the connecting rod shaft (1) as the axis of symmetry. The elastic sheet unit is fixedly connected to the inner sleeve of the torsion assembly (2). The inner sleeve rotates to drive the elastic sheet unit to torsion deformation.

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