An automatic feeding device

Abstract

The utility model relates to an automatic feeding device, including the casing, top has the opening, upper cover, cover is established at the top opening place of casing, paper feed roller, separation roller, document positioner, can be in first position and second position, under the condition that document positioner is in first position, document positioner is located between paper feed roller and separation roller paper moving path, and this state document positioner can be with the rear end of paper, under the condition that document positioner is in second position, document positioner is located outside paper moving path, the opening of casing top can supply user hand to reach into its and take paper, upper cover rotatably links with casing to open or close the opening of casing, upper cover and document positioner are driven through transmission assembly transmission between, in the process that upper cover rotates and opens the opening, transmission assembly transmission power to document positioner, so that document positioner moves from second position to first position, prevent '' heavy paper feed ''.

Description

Technical Field

[0001] This utility model relates to the field of imaging equipment (such as printers and copiers), and specifically to an automatic feeding device. Background Technology

[0002] All office machines, including printers, copiers, scanners, and fax machines, are equipped with an Automatic Document Feeder (ADF) to feed a stack of papers one by one into the machine for processing. When the operator places a document into the ADF, to prevent it from being placed too deep, the front end of the document rests against a stopper and stops at a predetermined position. After paper feeding begins, the stopper rotates to the OFF position. After passing through the separation section, the document is imaged by a contact image sensor (CIS) and then ejected.

[0003] When a document stops midway and a paper jam occurs, the display panel (OP PANEL) will show an error. The operator opens the top cover, removes the jammed document, and closes the top cover. Then, pressing the release button clears the error. Upon detecting that the release button has been pressed, the motor rotates in the reverse direction, changing the document limiter from the OFF state to the ON state, returning it to its initial state.

[0004] However, if the operator places the next document before pressing the release button, the document front will not stop at the document limiter position because the document limiter is in the OFF state. Depending on the amount of force applied by the operator, multiple pages of the document may be inserted into the separation roller position, which will significantly reduce the separation roller's ability to separate documents. As a result, the separation roller will transport multiple pages of the document together, resulting in a fault known as "double feed".

[0005] For example, the "Automatic Paper Feeding Device" disclosed in Chinese invention patent application CN200710045267.2 (publication number CN101372288A) includes a paper-blocking unit 22, which is driven by a drive component 23. The paper-blocking unit 22 is installed at the junction of the paper feed roller 21 and three inclined paper feed discs 201, 202, and 203. The displacement of the paper-blocking unit 22 is controlled by the drive component 23, and it can release the large paper P1 and the small paper P2 after blocking them.

[0006] Regardless of whether the user inserts small paper P2 and large paper P1 in sequence or large paper P1 followed by small paper P2, the paper stop unit 22 blocks the connection between the paper feed roller 21 and the three inclined paper feed trays (figure number omitted). Therefore, small paper P2 and large paper P1 will be neatly arranged in front of the connection between the paper feed roller 21 and the three inclined paper feed trays.

[0007] When the paper stop unit 22 is driven by the drive component 23 to retract, it first releases the large paper P1 that enters from the inclined paper feed tray of the paper storage unit, and then releases the small paper P2 in sequence, effectively controlling the large paper P1 to contact the paper feed roller 21 only.

[0008] The paper-blocking unit in this patent is equivalent to the "document limiter" mentioned above, and the paper-blocking unit in this patent also has the "re-feeding" defect mentioned above. Therefore, this problem needs to be solved. Utility Model Content

[0009] The technical problem to be solved by this utility model is to provide an automatic feeding device that can prevent double-feeding, based on the current state of the technology.

[0010] The technical solution adopted by this utility model to solve the above-mentioned technical problem is: an automatic feeding device, comprising...

[0011] The casing has an opening at the top;

[0012] The top cover is placed over the opening at the top of the casing;

[0013] The paper feed roller is rotatably mounted on the housing, and the paper feed roller drives the paper to move backward through the friction between the paper and the paper.

[0014] A separating roller, located behind the feed roller, is used to separate overlapping sheets of paper being conveyed. The rotation axes of both the separating roller and the feed roller extend in the left-right direction.

[0015] A document limiter is movably disposed in a housing. The document limiter can be in a first position and a second position. In the first position, the document limiter is located on the paper movement path between the feed roller and the separation roller, and in this state, the document limiter can abut against the rear end of the paper. In the second position, the document limiter is located outside the paper movement path.

[0016] The feature is that the opening at the top of the housing allows a user to reach inside and take out paper, the top cover is rotatably connected to the housing to open or close the opening of the housing, and the top cover and the document limiter are connected by a transmission component. During the process of the top cover rotating to open the opening, the transmission component transmits power to the document limiter, causing the document limiter to move from the second position to the first position.

[0017] The document limiter can be moved to switch between a first position and a second position. However, this requires reserving space for the document limiter's movement within the housing, resulting in a larger overall size of the automatic feeding device. Therefore, preferably, the document limiter is rotatably mounted in the housing, with its rotation axis extending in the left-right direction. This allows the document limiter to switch between the first and second positions by flipping, occupying less space and resulting in a compact structure.

[0018] In order for the transmission assembly to transmit power to the document limiter and switch it from the second position to the first position, the housing is provided with a rotating shaft extending in the left and right direction, and the rotating shaft can rotate around its axis. The transmission assembly includes a transmission part, a transmission component, and a transmission rod. The transmission rod is always connected to or in contact with the document limiter. The transmission component includes a bushing sleeved on the rotating shaft and a first connecting rod and a second connecting rod both connected to the bushing. The bushing can rotate relative to the rotating shaft. The second connecting rod is rotatably connected to the transmission rod, and their rotation axes extend in the left and right direction.

[0019] During the process of the upper cover switching from the closed opening state to the open opening state, the first connecting rod abuts against the transmission part, and during the process of the upper cover switching from the open opening state to the closed opening state, the first connecting rod disengages from the transmission part.

[0020] To facilitate the engagement of the transmission part with the first connecting rod, preferably, the transmission part is strip-shaped, with its first end mounted on the inner wall of the upper cover. The transmission part has a through hole extending along its length. When the upper cover is open and the document limiter is in the first position, the transmission part extends laterally, and the free end of the first connecting rod abuts against the second end of the transmission part. When the upper cover is closed and the document limiter is in the first position, the free end of the first connecting rod faces the through hole of the transmission part. When the upper cover is closed and the document limiter is in the second position, the free end of the first connecting rod passes through the through hole, and during the transition of the upper cover from this state to the open state, the top wall of the through hole abuts against the first connecting rod and presses it down.

[0021] In the above scheme, the rotating shaft is located behind the document limiter, and the first connecting rod, the second connecting rod, and the transmission rod all extend in the front-back direction, with the transmission rod located in front of the rotating shaft.

[0022] Because paper needs to be fed into the central part of the housing, the transmission unit is located near the left or right side of the top cover to allow for a paper feeding channel. The first connecting rod and the bushing are connected by a third connecting rod extending in the left-right direction. This minimizes the space occupied by the transmission assembly in the central part of the housing, thus avoiding interference with paper delivery.

[0023] The document limiter can be connected to the transmission rod to achieve transmission, but this requires a connection structure, leading to structural complexity. Therefore, preferably, in the second position, the document limiter at least partially abuts against the top wall of the transmission rod; in the first position, the transmission rod partially contacts the rear wall of the document limiter. This achieves transmission between the document limiter and the transmission rod through contact, simplifying the structure.

[0024] To enable the document limiter to switch from a first position to a second position, the bushing also has a working state in which it can be circumferentially fixed relative to the rotating shaft. The automatic feeding device further includes a drive mechanism for driving the rotating shaft to rotate clockwise or counterclockwise around its axis. The drive mechanism is driven and connected to the rotating shaft. When the drive mechanism drives the rotating shaft to rotate, the bushing is circumferentially fixed to the rotating shaft. During the process of the upper cover rotating to open the opening, the bushing rotates relative to the rotating shaft. The rotating shaft is driven to rotate by the drive mechanism, thereby enabling the document limiter to switch from the second position to the first position.

[0025] To allow the bushing to have two states—rotating relative to the shaft or fixed relative to the shaft in the circumferential direction—the automatic feeding device also includes an elastic element acting on the bushing, causing the bushing and the shaft to maintain a relatively fixed relationship in the axial direction. This creates friction between the bushing and the shaft. When the shaft rotates under the action of the drive mechanism, it drives the bushing to rotate synchronously. However, when the bushing rotates under the action of the upper cover, if the drive mechanism is not working, the shaft will be locked by the drive mechanism and cannot rotate, at which point the bushing will rotate relative to the shaft.

[0026] In the above scheme, the elastic element is a spring, the rotating shaft is provided with a limiting part, the bushing abuts against the limiting part in the axial direction, one end of the spring is installed on the rotating shaft, and the other end abuts against the bushing, so that the bushing maintains the tendency to abut against the limiting part in the axial direction.

[0027] Compared with the prior art, the advantages of this utility model are as follows: By setting a transmission component between the top cover and the document limiter, when the top cover is opened, the document limiter will automatically switch from the second position to the first position under the action of the transmission component. That is, the document limiter is located on the paper's movement path and can abut against the rear end of the paper. At this time, the document limiter limits the paper to prevent the user from inserting multiple pages of documents into the separation roller position, reducing the separation roller's ability to separate documents, causing the separation roller to convey multiple pages of documents together, thus producing a fault phenomenon known as "over-feeding". Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model (with the top cover open and the document limiter in the first position);

[0029] Figure 2 for Figure 1 A schematic diagram of the structure without the shell;

[0030] Figure 3 for Figure 1 A sectional view;

[0031] Figure 4 for Figure 1 Cross-sectional view of the transfer shaft and transmission components;

[0032] Figure 5 for Figure 4 A schematic diagram of the transmission components in the diagram;

[0033] Figure 6 This is a structural schematic diagram of an embodiment of the present utility model (with the top cover closed and the document limiter in the first position);

[0034] Figure 7 for Figure 6 A schematic diagram of the structure without the shell;

[0035] Figure 8 This is a cross-sectional view of an embodiment of the present invention (with the top cover closed and the document limiter in the second position);

[0036] Figure 9 for Figure 8 Structural diagram;

[0037] Figure 10 for Figure 9 A partial structural diagram showing the shell removed. Detailed Implementation

[0038] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, it should be understood that, unless otherwise stated, "multiple" means two or more, and the terms "upper," "lower," "left," "right," "top," "bottom," "front," "rear," etc., indicate the orientation or positional relationship based on the direction or positional relationship shown in the 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, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an adhesive connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model patent based on the specific circumstances.

[0041] like Figures 1-10 As shown, the automatic feeding device of this preferred embodiment includes a housing 1, a top cover 2, a document limiter 3, a paper feed roller 4, a separation roller 5, a transmission assembly, and a drive mechanism. The housing 1 in the accompanying drawings only shows a portion of the actual housing of the automatic feeding device.

[0042] like Figure 1 , 6 As shown, the top of the housing 1 has an opening 11, which allows the user to reach into and take out the paper 0. The top cover 2 is placed over the top opening 11 of the housing 1.

[0043] like Figure 3 As shown, the paper feed roller 4 is rotatably mounted on the housing 1. The paper feed roller 4 drives the paper 0 to move toward the rear side through the friction between it and the paper 0. The separating roller 5 is located behind the paper feed roller 4 and is used to separate the overlapping paper 0. The rotation axes of the paper feed roller 4 and the separating roller 5 both extend in the left-right direction.

[0044] The feed roller 4 conveys the top layer of paper 0 with a slight force of about several hundred grams. The friction between the paper 0 drives the paper below to move synchronously. The multiple sheets of paper 0 are separated at the separation roller 5 through a friction separation mechanism. Only the top layer of paper 0 is accurately conveyed to the image sensor for image scanning. The structure and operation of the feed roller 4 and the separation roller 5 adopt existing technology.

[0045] The document limiter 3 is rotatably disposed within the housing 1. The rotation axis of the document limiter 3 extends in the left-right direction. The document limiter 3 can be in a first position and a second position. In the first position, such as... Figure 3 As shown, the document stopper 3 is located on the paper 0's movement path between the feed roller 4 and the separation roller 5, and in this state, the document stopper 3 can abut against the rear end of the paper 0; in the second position, the document stopper 3 is located outside the paper 0's movement path, as shown... Figure 8 As shown. Of course, the document limiter 3 can also be moved to switch between the first and second positions.

[0046] When the automatic feeding device is in Figure 8 When the state shown is such that the top cover 2 closes the opening 11 and the document limiter 3 is in the second position, if the operator forcibly inserts the subsequent paper 0 with an external force of about 1 kg (exceeding the equipment's sorting capacity), it may cause multiple sheets of paper 0 to enter through the separation roller 5 at the same time, which will cause equipment failure known in the industry as "overlapping conveyor".

[0047] Therefore, if the automatic feeder malfunctions and the operator removes and reinserts paper 0, the document limiter 3 should be in the first position. Figure 7 As shown, the paper 0 is positioned to limit its movement.

[0048] To solve this problem, in this embodiment, the upper cover 2 is rotatably connected to the housing 1 to open or close the opening 11 of the housing 1, and the rotation axis of the upper cover 2 extends in the left and right direction.

[0049] The upper cover 2 and the document limiter 3 are connected by a transmission component. During the process of the upper cover 2 rotating to open the opening 11, the transmission component transmits power to the document limiter 3, causing the document limiter 3 to automatically move from the second position to the first position.

[0050] The transmission assembly transmits power from the upper cover 2 to the document limiter 3 in the following manner:

[0051] like Figure 2 , 3As shown, the housing 1 is provided with a rotating shaft 6 extending in the left-right direction, and the rotating shaft 6 can rotate around its axis. The transmission assembly includes a transmission part 71, a transmission component 72, and a transmission rod 73. The transmission rod 73 is always connected to or in contact with the document limiter 3. The transmission component 72 includes a bushing 721 sleeved on the rotating shaft 6 and a first connecting rod 722 and a second connecting rod 723 both connected to the bushing 721. The bushing 721 can rotate relative to the rotating shaft 6. The second connecting rod 723 is rotatably connected to the transmission rod 73, and their rotation axes extend in the left-right direction.

[0052] During the process of the upper cover 2 switching from the closed opening 11 to the open opening 11 state, the first connecting rod 722 abuts against the transmission part 71, and during the process of the upper cover 2 switching from the open opening 11 to the closed opening 11 state, the first connecting rod 722 disengages from the transmission part 71.

[0053] Specifically, in this embodiment, the transmission part 71 is strip-shaped, with its first end mounted on the inner wall of the upper cover 2. The transmission part 71 has a through hole 711 extending along its length. When the upper cover 2 opens the opening 11 of the housing 1 and the document limiter 3 is in the first position, such as... Figure 2 As shown, the transmission part 71 extends laterally, the free end of the first connecting rod 722 (the free end refers to the end not connected to the bushing 721) abuts against the second end of the transmission part 71, and the transmission rod 73 partially contacts the rear wall surface of the document limiter 3 (i.e., the first wall surface 31 below); when the upper cover 2 closes the opening 11 and the document limiter 3 is in the first position, as Figure 7 As shown, the free end of the first connecting rod 722 faces the through hole 711 of the transmission part; with the upper cover 2 closed at the opening 11 and the document limiter 3 in the second position, as... Figure 10 As shown, the free end of the first connecting rod 722 passes through the perforation 711, and the document limiter 3 at least partially presses against the top wall of the transmission rod 73. During the process of the upper cover 2 switching from this state to the open opening 11 state, the top wall of the perforation 711 will abut against the first connecting rod 722 and press down on the first connecting rod 722, causing the document limiter 3 to rotate toward the first position.

[0054] The rotating shaft 6 is located behind the document limiter 3. The first connecting rod 722, the second connecting rod 723 and the transmission rod 73 all extend in the front-back direction. The transmission rod 73 is located in front of the rotating shaft 6. The transmission part 71 is located near the left or right side of the upper cover 2. The first connecting rod 722 and the bushing 721 are connected by the third connecting rod 724 extending in the left-right direction.

[0055] In this embodiment, the document limiter 3 has a first wall surface 31, a second wall surface 32, and a bottom wall surface 33 connecting the first wall surface 31 and the second wall surface 32. The first wall surface 31 is located behind the second wall surface 32, and there is an included angle between them. When the document limiter 3 is in the second position, such as Figure 9 As shown, the first wall surface 31 of the document limiter 3 presses against the top wall surface of the transmission rod 73; when the document limiter 3 is in the first position, as... Figure 2 As shown, the end of the transmission rod 73 abuts against the first wall surface 31, and the second wall surface 32 abuts against the rear end of the paper 0.

[0056] The document limiter 3 is equipped with a pin 34 for rotatably connecting with the housing 1. The pin 34 is located at the connection between the second wall surface 32 and the bottom wall surface 33. Therefore, when the transmission rod 73 is released from its pushing position on the document limiter 3, the document limiter 3 will rotate downwards under its own weight and be in the second position. Of course, a torsion spring can also be provided on the document limiter 3 to keep the document limiter 3 tending to rotate towards the second position.

[0057] Because the document limiter 3 needs to be in the second position when the automatic feeding device is working normally, the bushing 721 also has a working state that can be fixed circumferentially relative to the rotating shaft 6. The drive mechanism is connected to the rotating shaft 6 to drive the rotating shaft 6 to rotate forward or backward around its axis, so that the document limiter 3 switches from the second position to the first position. The drive mechanism can use an existing motor.

[0058] When the drive mechanism drives the rotating shaft 6 to rotate, the bushing 721 is circumferentially fixed to the rotating shaft 6. When the upper cover 2 is open at the opening 11, the bushing 721 rotates relative to the rotating shaft 6. In other words, the bushing 721 has two states: rotating relative to the rotating shaft 6 or being circumferentially fixed relative to the rotating shaft 6. To achieve these two states, such as... Figure 4 As shown, the automatic feeding device also includes an elastic element 8 acting on the bushing 721, causing the bushing 721 and the rotating shaft 6 to maintain a relatively fixed axial direction. This creates friction between the bushing 721 and the rotating shaft 6. When the rotating shaft 6 rotates under the action of the drive mechanism, it drives the bushing 721 to rotate synchronously. However, when the bushing 721 rotates under the action of the upper cover 2, if the drive mechanism is not working, the rotating shaft 6 will be locked by the drive mechanism and cannot rotate. In this case, the bushing 721 rotates relative to the rotating shaft 6.

[0059] In this embodiment, the elastic element 8 is a spring, the rotating shaft 6 is provided with a limiting part 61, the bushing 721 abuts against the limiting part 61 in the axial direction, one end of the spring is installed on the rotating shaft 6, and the other end abuts against the bushing 721, so that the bushing 721 maintains the tendency to abut against the limiting part 61 in the axial direction, so as to ensure the friction between the two.

[0060] The operation process of the automatic feeding device in this embodiment is as follows:

[0061] Under normal operating conditions, such as Figure 8 As shown, the upper cover 2 closes the opening 11 of the housing 1, and the document limiter 3 is in the second position;

[0062] If the automatic feeding device malfunctions, the upper cover 2 is rotated to open the opening 11. During the rotation of the upper cover 2, the transmission component transmits power to the document limiter 3, causing the document limiter 3 to be in the first position. Figure 3 As shown, then remove paper 0;

[0063] The working process of the transmission assembly transmitting power to the document limiter 3 is as follows: the upper cover 2 is rotated open. During this process, the top wall surface of the through hole 711 of the transmission part 71 abuts against the first connecting rod 722 and presses down the first connecting rod 722, so that the bushing 721 rotates in the first direction (the rotating shaft 6 does not move), which drives the second connecting rod 723 and the transmission rod 73 to rotate synchronously. The transmission rod 73 pushes the document limiter 3 up to flip it to the first position.

[0064] Then, rotate the upper cover 2 to close the opening 11. During the rotation of the upper cover 2, because the first connecting rod 722 and the transmission part 71 disengage, the transmission assembly does not work, and the document limiter 3 remains in the first position. Figure 7 As shown, after the upper cover 2 is closed, paper 0 is placed in and abuts against the document limiter 3. Finally, the drive mechanism works to make the rotating shaft 6 rotate, and the bushing 721 rotates synchronously, eventually causing the document limiter 3 to switch from the first position to the second position. At this time, the paper feed roller 4 and the separation roller 5 work, and paper can be fed normally.

[0065] The working process of the drive mechanism driving the rotating shaft 6 to switch the document limiter 3 to the second position is as follows:

[0066] The drive mechanism drives the rotating shaft 6 to rotate in the second direction (the second direction is opposite to the first direction). During the rotation of the rotating shaft 6, due to the friction between it and the bushing 721, the bushing 721 will rotate synchronously, which will cause the second connecting rod 723 and the transmission rod 73 to rotate. The transmission rod 73 releases its pressure on the document limiter 3, and the document limiter 3 rotates to the second position under its own gravity.

[0067] As can be seen from the above, this embodiment sets a transmission component between the upper cover 2 and the document limiter 3. When the upper cover 2 is opened, the document limiter 3 will automatically switch from the second position to the first position under the action of the transmission component. That is, the document limiter 3 is located on the moving path of the paper 0 and can abut against the rear end of the paper 0. At this time, the document limiter 3 limits the paper 0 to prevent the user from inserting multiple pages of documents into the separation roller 5, which would reduce the separation ability of the separation roller 5 to separate documents. This would cause the separation roller 5 to convey multiple pages of documents together, resulting in a fault phenomenon called "over-feeding".

Claims

1. An automatic feeding device, comprising: The housing (1) has an opening (11) at the top; The top cover (2) is placed over the top opening (11) of the housing (1); The paper feed roller (4) is rotatably mounted on the housing (1). The paper feed roller (4) drives the paper (0) to move toward the rear side by friction with the paper (0). The separating roller (5), located behind the feed roller (4), is used to separate the overlapping paper (0) being conveyed. The rotation axes of the separating roller (5) and the feed roller (4) extend in the left-right direction. A document limiter (3) is movably disposed in the housing (1). The document limiter (3) can be in a first position and a second position. When the document limiter (3) is in the first position, the document limiter (3) is located on the paper (0) moving path between the paper feed roller (4) and the separation roller (5), and in this state, the document limiter (3) can abut against the rear end of the paper (0). When the document limiter (3) is in the second position, the document limiter (3) is located outside the paper (0) moving path. The feature is that the opening (11) at the top of the housing (1) allows the user to reach in and take out paper (0), the upper cover (2) is rotatably connected to the housing (1) about an axis extending in the left and right direction to open or close the opening (11) of the housing (1), the upper cover (2) and the document limiter (3) are driven by a transmission component, and during the process of the upper cover (2) rotating to open the opening (11), the transmission component transmits power to the document limiter (3), so that the document limiter (3) moves from the second position to the first position.

2. The automatic feeding device according to claim 1, characterized in that: The document limiter (3) is rotatably mounted in the housing (1), and the rotation axis of the document limiter (3) extends in the left-right direction.

3. The automatic feeding device according to claim 2, characterized in that: The housing (1) is provided with a rotating shaft (6) extending in the left and right direction, and the rotating shaft (6) can rotate around its axis. The transmission assembly includes a transmission part (71), a transmission component (72), and a transmission rod (73). The transmission rod (73) is always connected to or in contact with the document limiter (3). The transmission component (72) includes a bushing (721) sleeved on the rotating shaft (6) and a first connecting rod (722) and a second connecting rod (723) both connected to the bushing (721). The bushing (721) can rotate relative to the rotating shaft (6). The second connecting rod (723) is rotatably connected to the transmission rod (73), and their rotation axes extend in the left and right direction. During the process of the upper cover (2) switching from the closed opening (11) state to the open opening (11) state, the first connecting rod (722) abuts against the transmission part (71), and during the process of the upper cover (2) switching from the open opening (11) state to the closed opening (11) state, the first connecting rod (722) disengages from the transmission part (71).

4. The automatic feeding device according to claim 3, characterized in that: The transmission part (71) is strip-shaped, with its first end mounted on the inner wall of the upper cover (2). The transmission part (71) has a through hole (711) extending along its length. When the upper cover (2) is open (11) of the housing (1) and the document limiter (3) is in the first position, the transmission part (71) extends laterally, and the free end of the first connecting rod (722) abuts against the second end of the transmission part (71). When the upper cover (2) is closed (11) and the document limiter (3) is in the first position, the transmission part (71) extends laterally, and the free end of the first connecting rod (722) abuts against the second end of the transmission part (71). In the first position, the free end of the first connecting rod (722) faces the through hole (711) of the transmission part; when the upper cover (2) closes the opening (11) and the document limiter (3) is in the second position, the free end of the first connecting rod (722) passes through the through hole (711), and during the process of the upper cover (2) switching from this state to the open opening (11) state, the top wall surface of the through hole (711) will abut against the first connecting rod (722) and press down the first connecting rod (722).

5. The automatic feeding device according to claim 4, characterized in that: The rotating shaft (6) is located behind the document limiter (3). The first connecting rod (722), the second connecting rod (723) and the transmission rod (73) all extend in the front-back direction. The transmission rod (73) is located in front of the rotating shaft (6).

6. The automatic feeding device according to claim 5, characterized in that: The transmission part (71) is located near the left or right side of the upper cover (2), and the first connecting rod (722) and the bushing (721) are connected by a third connecting rod (724) extending in the left-right direction.

7. The automatic feeding device according to claim 5, characterized in that: When the document limiter (3) is in the second position, the document limiter (3) at least partially presses against the top wall surface of the transmission rod (73); when the document limiter (3) is in the first position, the transmission rod (73) partially contacts the rear wall surface of the document limiter (3).

8. The automatic feeding device according to any one of claims 3 to 7, characterized in that: The bushing (721) also has a working state in which it can be circumferentially fixed relative to the rotating shaft (6). The automatic feeding device also includes a drive mechanism for driving the rotating shaft (6) to rotate forward or backward around its axis. The drive mechanism is driven and connected to the rotating shaft (6). When the drive mechanism drives the rotating shaft (6) to rotate, the bushing (721) is circumferentially fixed to the rotating shaft (6). When the upper cover (2) is open (11), the bushing (721) rotates relative to the rotating shaft (6).

9. The automatic feeding device according to claim 8, characterized in that: It also includes an elastic element (8) acting on the bushing (721), which makes the bushing (721) and the shaft (6) tend to be relatively fixed in the axial direction.

10. The automatic feeding device according to claim 9, characterized in that: The elastic element (8) is a spring. The rotating shaft (6) is provided with a limiting part (61). The bushing (721) abuts against the limiting part (61) in the axial direction. One end of the spring is installed on the rotating shaft (6), and the other end abuts against the bushing (721), so that the bushing (721) maintains the tendency to abut against the limiting part (61) in the axial direction.

Images