Reverse buckling type hinge and image forming equipment

Abstract

The utility model discloses a back-buckling type hinge and image forming equipment, the back-buckling type hinge is respectively connected with an image forming equipment body and a cover assembly, and the image forming equipment body / the cover assembly is provided with a locking fastener. Comprising a lower supporting rod rotationally connected to an image forming equipment body, an upper supporting rod rotationally connected to a cover assembly, a limiting structure and a buffering component, a supporting rod buckle is arranged on the upper supporting rod / lower supporting rod, and a locking fastener can be clamped with the supporting rod buckle; when the cover assembly is in an open state, the limiting structure can maintain the relative position of the upper supporting rod and the lower supporting rod; the buffer member can retard a closing action of the cover assembly with respect to the image forming apparatus body. The utility model also discloses an image forming device. According to the utility model, the cover assembly can be prevented from being pulled and deformed, the quality of scanned images is ensured, and the cover assembly can be prevented from rapidly falling to impact the image forming equipment body.

Description

Technical Field

[0001] The utility model relates to the technical field of image forming, in particular to a rebate hinge and image forming equipment. Background Art

[0002] The top cover of the image forming device is opened or closed by a hinge structure to take out the paper between the body and the top cover. In the prior art, in order to keep the top cover open, a fastener is provided on the hinge structure to stabilize it at a fixed angle. However, during the closing process of the cover assembly, once the hinge structure is out of the fastening state, the cover assembly is prone to fall rapidly and impact the body of the image forming device, resulting in damage to the hinge and the body shell, and even affecting the important parts of the body and the top cover in severe cases. Utility Model Content

[0003] According to one aspect of the utility model, a snap-back hinge is provided, which can connect an image forming device body and a cover assembly respectively, wherein the cover assembly can rotate on the image forming device body to be opened or closed relative to the image forming device body, and a locking fastener is provided on the image forming device body / the cover assembly, including:

[0004] A lower support rod rotatably connected to the image forming device body;

[0005] An upper support rod rotatably connected to the cover assembly and hinged to the lower support rod, the upper support rod / the lower support rod is provided with a support rod buckle, when the cover assembly is in a closed state, the upper support rod and the lower support rod are folded and arranged between the cover assembly and the image forming device body, and the locking fastener is clamped with the support rod buckle;

[0006] A limiting structure, when the cover assembly is in an open state, the limiting structure can limit the rotation of the upper support rod on the lower support rod to maintain the relative position of the upper support rod and the lower support rod;

[0007] The buffer member is arranged at the hinge between the upper support rod and the lower support rod to block the closing action of the cover assembly relative to the image forming device body.

[0008] The utility model discloses a rebate hinge, by arranging an upper support rod and a lower support rod between an image forming device body and a cover assembly, and arranging a buffer component at a hinged position of the upper support rod and the lower support rod, assuming that the initial state is a closed state, the cover assembly is covered on the image forming device body, and the supporting buckles on the upper support rod / lower support rod are clamped with the locking fasteners on the image forming device body / cover assembly; in the open state of the cover assembly, the cover assembly is lifted to drive the cover assembly to rotate in a direction away from the image forming device body, so that the supporting bar buckle is separated from the locking fastener, and the upper support rod is rotated in a direction away from the lower support rod to open the cover assembly, and under the action of the limiting structure, the relative position of the upper support rod and the lower support rod can be maintained; when switching to the closed state of the cover assembly, the lower cover assembly is pressed down to drive the cover assembly to rotate in a direction close to the image forming device body, thereby driving the upper support rod to rotate in a direction close to the lower support rod, so that the supporting bar buckle can be clamped with the locking fastener, so that the cover assembly is locked on the image forming device body. That is, the cover assembly is locked by clamping the rebate hinge and the locking rod, which can avoid the risk of deformation of the cover assembly and ensure the quality of the scanned image. During the descent of the cover assembly, the buffer member can block the closing action of the cover assembly relative to the image forming device body, thereby preventing the cover assembly from falling rapidly and impacting the image forming device body.

[0009] In some embodiments, the limiting structure includes a first limiting member and a second limiting member, the first limiting member is arranged on the lower support rod, and the second limiting member is arranged on the upper support rod, and when the cover assembly is in an open state, the first limiting member can be connected to the second limiting member to limit the rotation of the upper support rod on the lower support rod to maintain the relative position of the upper support rod and the lower support rod.

[0010] In some embodiments, when the cover assembly is in an open state, the first limiting member can be clamped with the second limiting member to limit the rotation of the upper support rod on the lower support rod.

[0011] In some embodiments, the end of the upper support rod hinged to the lower support rod has an elastic sheet, and when the first limit member and the second limit member are in contact and clamped, the elastic sheet contacts the lower support rod to block the clamping action of the first limit member and the second limit member; and / or,

[0012] The end of the lower support rod hinged to the upper support rod has an elastic sheet, and when the first limit member and the second limit member are in contact and clamped, the elastic sheet contacts the upper support rod to block the clamping action of the first limit member and the second limit member.

[0013] In some embodiments, the buffer member includes an elastic body and a first end and a second end protruding on opposite sides of the elastic body, the first end abuts against a first folding surface of the upper support rod and the lower support rod, and the second end abuts against a second folding surface of the lower support rod opposite to the first folding surface.

[0014] In some embodiments, a pin is further included, and corresponding axial holes are opened on the upper support rod and the lower support rod, and the pin passes through the axial hole to enable the upper support rod to rotate on the lower support rod.

[0015] In some embodiments, the locking fastener includes a locking rod and a locking buckle arranged on the locking rod, and the locking rod is arranged on the image forming device body / the cover assembly. When the cover assembly is in a closed state, the locking buckle can be buckled with the support rod buckle.

[0016] According to another aspect of the utility model, an image forming device is provided, comprising an image forming device body, a cover assembly and the rebate hinge, wherein the lower support rod can rotate on the image forming device body, the upper support rod can rotate on the cover assembly, and the locking fastener can reciprocate between a clamping position and an avoidance position to achieve clamping or separation with the support rod.

[0017] The image forming device of the utility model is provided with an upper support rod and a lower support rod between the image forming device body and the cover assembly, and a buffer member is provided at the hinge of the upper support rod and the lower support rod. When the cover assembly is in an open state, the limit structure can maintain the relative position of the upper support rod and the lower support rod; when the cover assembly is in a closed state, the support rod buckle can be clamped with the locking fastener, so that the cover assembly is locked on the image forming device body, which can avoid the risk of the cover assembly being pulled and deformed, and ensure the quality of the scanned image. During the descent of the cover assembly, the buffer member can block the closing action of the cover assembly relative to the image forming device body, thereby preventing the cover assembly from falling rapidly and impacting the image forming device body.

[0018] In some embodiments, an elastic member is further included, and the elastic member is used to move the locking fastener from the avoidance position to the locking position.

[0019] In some embodiments, a receiving groove is provided on the image forming device body, and when the cover assembly is in a closed state, the upper support rod and the lower support rod can be received in the receiving groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the image forming device of the present invention when the cover assembly is closed;

[0021] Figure 2 It is a three-dimensional diagram of the image forming device of the present invention when the cover assembly is opened;

[0022] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0023] Figure 4 It is an exploded view of the main parts of the rebate hinge in the utility model;

[0024] Figure 5 It is a cross-sectional view of the rebate hinge in the utility model in a closed state;

[0025] Figure 6 It is a cross-sectional view of the rebate hinge in the utility model in the open state;

[0026] Figure 7 for Figure 6 A magnified schematic diagram of B;

[0027] Figure 8 It is a three-dimensional diagram of the lower support rod in the utility model.

[0028] In the figure: 10, image forming device body; 100, locking rod; 101, locking buckle; 102, elastic member; 103, storage slot; 104, boss; 20, cover assembly; 200, bearing; 30, rebate hinge; 300, lower support rod; 301, upper support rod; 302, support rod buckle; 303, first limit member; 304, second limit member; 305, buffer member; 306, pin shaft; 307, positioning member; 308, elastic sheet; 309, elastic body; 310, first end; 311, second end; 312, first folding surface; 313, second folding surface. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0034] Please refer to Figure 1 , 2 4. The present embodiment provides an image forming device, comprising an image forming device body 10, a cover assembly 20, a rebate hinge 30 and an elastic member 102. The cover assembly 20 rotates on the image forming device body 10 to be opened or closed relative to the image forming device body. A locking fastener is provided on the image forming device body 10. Both ends of the rebate hinge 30 are respectively connected to the image forming device body 10 and the cover assembly 20. In the closed state of the cover assembly 20, the rebate hinge 30 is folded and arranged between the cover assembly 20 and the image forming device body 10, and the locking fastener can maintain the folding action of the rebate hinge 30 and limit the opening of the cover assembly 20; in the open state of the cover assembly 20, the rebate hinge 30 can be unfolded to maintain the relative position of the cover assembly 20 and the image forming device body 10; under the action of the elastic member 102, the locking fastener can be clamped and separated.

[0035] In another embodiment, the locking fastener is disposed on the cover assembly 20 .

[0036] Please refer to Figure 4-5 The locking fastener can move between the avoidance position and the clamping position. The elastic member 102 is used to move the locking fastener from the avoidance position to the clamping position, thereby effectively realizing the clamping and separation of the rebate hinge 30. Specifically, the locking fastener includes a locking rod 100 and a locking buckle 101 disposed on the locking rod 100. The locking rod 100 is disposed on the image forming device body 10. When the cover assembly 20 is in the closed state, the locking buckle 101 can be clamped with the rebate hinge 30. The locking rod 100 can move on the image forming device body 10 to realize the clamping and separation with the rebate hinge 30. Specifically, the locking rod 100 can reciprocate between the clamping position and the avoidance position to correspond to or stagger the position of the rebate hinge 30 to realize the clamping or separation.

[0037] Please refer to Figure 3-5 The elastic member 102 and one end of the locking rod 100 are both mounted on the image forming device body 10, and the elastic member 102 is connected to the other end of the locking rod 100. This arrangement allows the end of the locking rod 100 connected to the elastic member 102 to swing on the image forming device body 10. The elastic member 102 is preferably a spring. In the initial state, the cover assembly 20 is covered on the image forming device body 10, the locking rod 100 is located in the clamping position, and the rebate hinge 30 is clamped with the locking rod 100; when the cover assembly 20 is opened, the cover assembly 20 rotates upward, so that the rebate hinge 30 squeezes the spring, and the spring is compressed, forcing the locking rod 100 to move from the clamping position to the avoidance position. At this time, the rebate hinge 30 can be unfolded and separated from the locking rod 100 to realize the cover. When the cover assembly 20 is pressed down, the cover assembly 20 rotates downward, so that the rebate hinge 30 squeezes the spring, and the spring is compressed, forcing the locking rod 100 to move from the clamping position to the avoidance position, so that the rebate hinge 30 can be folded to move and reset. At this time, the spring is not squeezed and can be stretched and reset to move the locking rod 100 to the clamping position, so that the rebate hinge 30 and the locking rod 100 are clamped to lock the cover assembly 20 on the image forming device body 10.

[0038] In another embodiment, the elastic member 102 includes a driving mechanism. When the cover assembly 20 is opened, the driving mechanism can drive the locking rod 100 to move from the clamping position to the avoidance position, and the snap-back hinge 30 can be separated from the locking rod 100 to realize the opening of the cover assembly 20; when the cover assembly 20 is pressed down, the driving mechanism drives the locking rod 100 to move from the avoidance position to the clamping position, and the snap-back hinge 30 is clamped with the locking rod 100 to lock the cover assembly 20 on the image forming device body 10. The driving mechanism can be a driving component such as a cylinder, a motor, etc., and the movement of the above-mentioned driving component can be controlled by a controller. Such an elastic member 102 can help improve the degree of automation of the movement of the locking rod 100.

[0039] Please refer to Figure 1-5 The image forming device body 10 has a receiving groove 103, and the locking fastener is located in the receiving groove 103. When the cover assembly 20 is pressed down, the snap-back hinge 30 can be folded and set in the receiving groove 103, thereby achieving effective storage and locking of the snap-back hinge 30. Specifically, the top surface of the image forming device body 10 protrudes upward to form a boss 104, and the receiving groove 103 is formed by the top surface of the boss 104 being recessed toward the bottom surface. More specifically, the boss 104 with the receiving groove 103 is located on the right side of the image forming device body 10. In this way, the structure of the image forming device body 10 is reasonably utilized, and the volume of the image forming device body 10 can be made smaller, reducing the material cost.

[0040] In another embodiment, the storage groove 103 is formed by being recessed from the top surface of the image forming apparatus body 10 toward the bottom surface.

[0041] Please refer to Figure 2-4 The rebate hinge 30 includes a lower support rod 300, an upper support rod 301, a limiting structure, a buffer component 305, a pin 306 and a positioning member 307. The lower support rod 300 is rotatably installed on the image forming device body 10, and the upper support rod 301 is rotatably connected to the cover assembly 20 through a bearing 200. The upper support rod 301 is installed on the lower support rod 300 through a pin 306 so that the upper support rod 301 can rotate on the lower support rod 300. Under the action of the positioning member 307, the pin 306 can be limited to move upward in the horizontal direction, thereby preventing the pin 306 from separating from the lower support rod 300 and the upper support rod 301 to ensure the stability of the connection structure between the lower support rod 300 and the upper support rod 301. In the closed state of the cover assembly 20, the upper support rod 301 and the lower support rod 300 are folded and arranged between the cover assembly 20 and the image forming device body 10, and the locking fastener is clamped with the upper support rod 301; when the cover assembly 20 is opened and switched from the initial state to the open state, the limit structure can limit the rotation of the upper support rod 301 on the lower support rod 300 to maintain the relative position of the upper support rod 301 and the lower support rod 300. The buffer member 305 is arranged at the hinge of the upper support rod 301 and the lower support rod 300. When the lower cover assembly 20 is switched from the open state to the closed state, the buffer member 305 can block the closing action of the cover assembly 20 relative to the image forming device body 10, that is, limit the cover assembly 20 from rotating downward to play a buffering role.

[0042] Please refer to Figure 4-6The upper support rod 301 has a support rod buckle 302, and the locking rod 100 has a locking buckle 101. In the initial state (closed state), the cover assembly 20 covers the image forming device body 10, the rebate hinge 30 is folded and stored in the storage groove 103, the locking rod 100 is in the clamping position, and the support rod buckle 302 of the upper support rod 301 is clamped with the locking buckle 101 of the locking rod 100. When the lid assembly 20 is opened and switched from the initial state to the open state, the upper support rod 301 is driven to lift up and rotate in the direction close to the lid assembly 20, the upper support rod 301 squeezes the locking rod 100, the spring is compressed, and the locking rod 100 can move from the clamping position to the avoidance position, so that the support rod buckle 302 is separated from the locking buckle 101, so that the upper support rod 301 is separated from the locking rod 100, and then the lid assembly 20 is opened; the spring is stretched and reset, and the locking rod 100 is reset to the avoidance position; the upper support rod 301 is continuously lifted, so that the lower support rod 300 is lifted upward with the upper support rod 301 and rotates in the direction away from the image forming device body 10, so that the rebate hinge 30 is unfolded; under the action of the limiting structure, the upper support rod 301 will not rotate relative to the lower support rod 300 but can maintain the relative position of the upper support rod 301 and the lower support rod 300, that is, the relative position of the lid assembly 20 on the image forming device body 10 can be maintained, thereby ensuring that it is maintained in the open state.

[0043] The lower cover assembly 20 switches from the open state to the closed state, driving the upper support rod 301 and the lower support rod 300 to move downward and rotate in the direction close to the image forming device body 10, so that the rebate hinge 30 is folded; in the above process, the buffer member 305 at the hinge of the upper support rod 301 and the lower support rod 300 can block the closing action of the cover assembly 20 relative to the image forming device body 10, so that the cover assembly 20 can slowly descend to avoid sudden falling and impacting the image forming device body 10, which is beneficial to prolonging the service life of the rebate hinge 30. When the upper support rod 301 enters the storage groove 103, the upper support rod 301 can squeeze the locking rod 100, and the spring is compressed, forcing the locking rod 100 to move from the clamping position to the avoidance position, so that the rebate hinge 30 can move and reset. At this time, the spring is not squeezed and can reset to make the locking rod 100 move to the clamping position, and the support rod buckle 302 of the upper support rod 301 can be clamped with the locking buckle 101 of the locking rod 100, so that the upper support rod 301 is clamped with the locking rod 100, so that the cover assembly 20 can be locked on the image forming device body 10.

[0044] In another embodiment, the support rod buckle 302 is disposed on the lower support rod 300 .

[0045] Please refer to Figure 4-7The limiting structure includes a first limiting member 303 and a second limiting member 304. The first limiting member 303 is arranged on the lower support rod 300, and the second limiting member 304 is arranged on the upper support rod 301. When the cover assembly 20 is in the open state, the upper support rod 301 is lifted upward and rotated in a direction close to the cover assembly 20, and the lower support rod 300 is lifted upward and rotated in a direction away from the image forming device body 10 as the upper support rod 301 is lifted upward, so that the first limiting member 303 can be in contact with the second limiting member 304. The two limiting members 304 are clamped to limit the rotation of the upper support rod 301 on the lower support rod 300 to maintain the relative positions of the upper support rod 301 and the lower support rod 300, thereby allowing the cover assembly 20 to be maintained at the maximum rotation angle; in the closed state of the cover assembly 20, the first limiting member 303 is separated from the second limiting member 304 so that the upper support rod 301 can rotate on the lower support rod 300 and the support rod buckle 302 can be clamped with the locking buckle 101 of the locking rod 100.

[0046] For details, please refer to Figure 6-7 The first limiting member 303 and the second limiting member 304 are a pair of limiting buckles arranged opposite to each other. Such a structure is easy to manufacture and has low cost.

[0047] In another embodiment, the first stopper 303 and the second stopper 304 are connected by magnetism. Specifically, the first stopper 303 and the second stopper 304 can be a magnet and a magnetic member, and the material of the magnetic member is iron, steel, cobalt or nickel; or, the first stopper 303 and the second stopper 304 are set as a pair of magnets with opposite polarities; or, magnets with opposite polarities are installed on the first stopper 303 and the second stopper 304. In the open state of the cover assembly 20, the first stopper 303 and the second stopper 304 can be mutually attracted, so that the cover assembly 20 can be maintained at the maximum rotation angle; in the closed state, the first stopper 303 and the second stopper 304 are separated.

[0048] Please refer to Figure 5-8When the cover assembly 20 is opened, the first stopper 303 and the second stopper 304 are clamped to make the snap-back hinge 30 unfold. When the stopper buckle is clamped, the upper support rod 301 and the lower support rod 300 collide, which generates a large noise. Therefore, the end of the lower support rod 300 that is hinged to the upper support rod 301 is provided with an elastic sheet 308. When the first stopper 303 and the second stopper 304 are in contact and clamped, the elastic sheet 308 contacts the upper support rod 301 to block the clamping action of the first stopper 303 and the second stopper 304. That is, by adding the elastic sheet 308 to the lower support rod 300, when the upper support rod 301 is opened, the upper support rod 301 squeezes the elastic sheet 308 located on the lower support rod 300 at a certain angle, which plays a buffering and shock-absorbing effect, and prevents the upper support rod 301 and the lower support rod 300 from directly clamping and colliding to produce noise. Specifically, on the lower support rod 300, the number of the elastic sheets 308 is preferably two, which can help to further improve the noise reduction effect.

[0049] In another embodiment, an elastic sheet 308 is provided at the end of the upper support rod 301 hinged to the lower support rod 300. When the first limit member 303 and the second limit member 304 are in contact and clamped, the elastic sheet 308 contacts the lower support rod 300 to block the clamping action of the first limit member 303 and the second limit member 304; or, an elastic sheet 308 is provided at the end of the lower support rod 300 hinged to the upper support rod 301 and an elastic sheet 308 is provided at the end of the upper support rod 301 hinged to the lower support rod 300. When the first limit member 303 and the second limit member 304 are in contact and clamped, the two elastic sheets 308 contact the lower support rod 300 and the upper support rod 301 respectively to block the clamping action of the first limit member 303 and the second limit member 304.

[0050] Please refer to Figure 2-4 The buffer member 305 is preferably a torsion spring, including an elastic body 309 and a first end 310 and a second end 311 protruding on opposite sides of the elastic body 309. The elastic body 309 is mounted on the pin 306, the first end 310 abuts against the first folding surface 312 of the upper support rod 301 and the lower support rod 300, and the second end 311 abuts against the second folding surface 313 of the lower support rod 300 opposite to the first folding surface 312. When the cover assembly 20 is closed, the torsion spring will have a reverse force to prevent the cover assembly 20 from falling rapidly, thereby achieving a buffering effect, thereby preventing the cover assembly 20 from suddenly falling and impacting the image forming device body 10, which is beneficial to extending the service life of the rebate hinge 30, and can achieve the buffering function without increasing the cost and avoid affecting the imaging quality of the image forming device.

[0051] In another embodiment, the buffer member 305 is a buffer spring or elastic cotton installed between the cover assembly 20 and the image forming device body 10. More specifically, the number of buffer members 305 is set to two or more, and they are symmetrically arranged between the cover assembly 20 and the image forming device body 10, which can help improve the buffering effect.

[0052] Please refer to Figure 3 , 4 The upper support rod 301 and the lower support rod 300 are both provided with corresponding shaft holes, and the pin shaft 306 passes through the shaft holes so that the upper support rod 301 can rotate on the lower support rod 300. This arrangement makes the structure of the rebate hinge 30 simple.

[0053] Please refer to Figure 3 , 4 The positioning member 307 is configured as a snap ring, preferably an E-shaped snap ring, so that the pin shaft 306 can rotate in the shaft hole while limiting its horizontal movement.

[0054] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A snap-back hinge, which can connect an image forming device body and a cover assembly respectively, wherein the cover assembly can rotate on the image forming device body to be opened or closed relative to the image forming device body, and a locking fastener is provided on the image forming device body / the cover assembly, characterized in that: include: A lower support rod rotatably connected to the image forming device body; An upper support rod rotatably connected to the cover assembly and hinged to the lower support rod, the upper support rod / the lower support rod is provided with a support rod buckle, when the cover assembly is in a closed state, the upper support rod and the lower support rod are folded and arranged between the cover assembly and the image forming device body, and the locking fastener is clamped with the support rod buckle; a limiting structure, wherein when the cover assembly is in an open state, the limiting structure can limit the rotation of the upper support rod on the lower support rod to maintain the relative position of the upper support rod and the lower support rod; The buffer member is arranged at the hinge between the upper support rod and the lower support rod to block the closing action of the cover assembly relative to the image forming device body.

2. The rebate hinge according to claim 1, characterized in that: The limiting structure includes a first limiting member and a second limiting member, the first limiting member is arranged on the lower support rod, and the second limiting member is arranged on the upper support rod. In the open state of the cover assembly, the first limiting member can be connected to the second limiting member to limit the rotation of the upper support rod on the lower support rod to maintain the relative position of the upper support rod and the lower support rod.

3. The snap-back hinge according to claim 2, characterized in that: When the cover assembly is in an open state, the first limiting member can be clamped with the second limiting member to limit the rotation of the upper support rod on the lower support rod.

4. The snap-back hinge according to claim 3, characterized in that: The end of the upper support rod hinged to the lower support rod has an elastic sheet, and when the first limit member and the second limit member are in contact and clamped, the elastic sheet contacts the lower support rod to block the clamping action of the first limit member and the second limit member; and / or, The end of the lower support rod hinged to the upper support rod has an elastic sheet, and when the first limit member and the second limit member are in contact and clamped, the elastic sheet contacts the upper support rod to block the clamping action of the first limit member and the second limit member.

5. The snap-back hinge according to claim 1, characterized in that: The buffer component includes an elastic body and a first end and a second end protruding on opposite sides of the elastic body, the first end abuts against a first folding surface of the upper support rod and the lower support rod, and the second end abuts against a second folding surface of the lower support rod opposite to the first folding surface.

6. The snap-back hinge according to claim 1, characterized in that: It also includes a pin shaft, and corresponding shaft holes are opened on the upper support rod and the lower support rod. The pin shaft passes through the shaft hole so that the upper support rod can rotate on the lower support rod.

7. The snap-back hinge according to claim 1, characterized in that: The locking fastener includes a locking rod and a locking buckle arranged on the locking rod. The locking rod is arranged on the image forming device body / the cover assembly. When the cover assembly is in a closed state, the locking buckle can be buckled with the support rod buckle.

8. An image forming device, characterized in that: It comprises an image forming device body, a cover assembly and the rebate hinge described in any one of claims 1 to 7, wherein the lower support rod can rotate on the image forming device body, the upper support rod can rotate on the cover assembly, and the locking fastener can reciprocate between a clamping position and an avoidance position to achieve clamping or separation with the support rod.

9. The image forming apparatus according to claim 8, wherein: It also includes an elastic member, which is used to move the locking fastener from the avoidance position to the clamping position.

10. The image forming apparatus according to claim 8, wherein: The image forming device body is provided with a receiving groove, and when the cover assembly is in a closed state, the upper supporting rod and the lower supporting rod can be received in the receiving groove.

Images