Paper feeding device for printer and printer

Abstract

The present invention relates to a paper feeding device for a printer and a printer, comprising: a first gear rotatably provided on a first gear shaft of a support frame; a swing arm, a first end of which is rotatably provided on the first gear shaft, and a second end of which is provided with a second gear that can rotate freely, and the second gear meshes with the first gear; a limit stop member provided on a moving path of the second gear as the swing arm swings, and configured to: be able to abut against the teeth of the second gear to limit the second gear at a first position disengaged from the gear transmission assembly and allow the second gear to cross over the limit stop member and swing along a first direction with the swing arm to a second position engaged with the gear transmission assembly during the rotation of the second gear; a paper limit member is linked with the swing arm, so that it can be in a paper blocking state when the second gear is at the first position and in a non-paper blocking state when the second gear is at the second position. The paper feeding device has a simple structure, ingenious design, and can achieve the accurate paper limiting function.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to a paper feeding device for a printer and a printer. Background Art

[0002] Printers are commonly used products in daily work and life. Existing printer products usually have a paper stop mechanism to limit the position of a stack of paper and avoid the problem of paper overfeed. Figure 6 The paper feeding device of a multifunctional printer shown in the figure includes a paper feeding mechanism 1. A paper stop mechanism 2 is arranged at the paper inlet of the paper feeding mechanism 1. When the printer is not started, the paper is blocked outside the paper feeding passage by the paper stop mechanism 2; when the printer is started, the paper stop mechanism 2 rises, and the paper feeding mechanism 1 draws the paper into the paper feeding passage. Specifically, the paper feeding device also includes a connecting rod 3 connected to the paper feeding mechanism 1 and the paper stop mechanism 2. The connecting rod 3 is pivotally mounted on the upper cover 4 of the printer in a swingable manner, and has a first linkage part 5 and a second linkage part 6. The first linkage part 5 is connected to the paper feeding mechanism 1, and the second linkage part 6 is connected to the paper stop mechanism 2. The paper feeding mechanism 1 and the paper stop mechanism 2 are connected by the connecting rod 3 and act in opposite directions. However, the paper stop mechanism in the paper feeding device can only move up and down, and the moving stroke is very limited due to the influence of the paper feeding mechanism and the upper cover, and a large number of papers cannot be input, which results in a very limited paper feeding amount of the paper feeding device, restricting the scope of use of the product.

[0003] To this end, a Chinese invention patent application with application number CN201410391100.1 (authorization announcement number: CN104199262B) discloses a paper blocking mechanism, a paper feeding unit, an image forming device and a paper feeding method. The paper blocking mechanism includes a swingable stopper and a paper blocking member arranged in a paper feeding channel, and also includes a separation component that keeps the stopper and the paper blocking member in a separated state; when the paper blocking mechanism is in a paper blocking state, the paper blocking member swings under the action of an external force and collides with the stopper, and the paper blocking member stops swinging and blocks the paper, preventing the paper from moving forward; when the paper blocking mechanism is in a non-paper blocking state, the paper blocking member swings under the action of an external force and separates from the stopper.

[0004] The paper stop mechanism in the above patent application also has certain shortcomings. The paper stop mechanism involves many parts and requires additional one-way spring parts, resistance spring parts and other parts to enable the drive shaft to selectively drive the paper feed roller bracket to swing and the paper feed roller to rotate automatically. The structure is relatively complex, the assembly process is cumbersome, and the production cost is high. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a paper feeding device for a printer with a simple structure, ingenious design and the ability to accurately limit the position of paper in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above first technical problem is as follows: A paper feeding device for a printer, comprising:

[0007] A paper feed roller assembly, including a paper feed roller and a gear transmission assembly in transmission cooperation with the paper feed roller, the gear transmission assembly is driven by an external force to drive the paper feed roller to rotate around its own axis;

[0008] A paper limiting member, located in front of the paper feed roller along the paper transmission direction, the paper limiting member can rotate around a straight line parallel to the paper feed roller as the rotation center, and at least has a paper blocking state of resisting the front side of the paper to limit the forward movement of the paper and a non-paper blocking state of releasing the limit on the paper to allow the paper to pass;

[0009] It further includes:

[0010] A first gear, rotatably arranged on a first gear shaft of a support frame in a manner that can rotate around its own axis;

[0011] A swing arm, its first end is rotatably arranged on the first gear shaft, and can be reciprocally deflected within a set angle range by the drive of the first gear. A second gear that can rotate freely is provided at the second end of the swing arm, the second gear meshes with the first gear. The direction in which the swing arm rotates towards the paper feed roller is denoted as the first direction, and the direction in which the swing arm rotates away from the paper feed roller is denoted as the second direction;

[0012] A limit stop member, arranged on the moving path of the second gear as the swing arm deflects, and is configured to: be able to abut against the teeth of the second gear to limit the second gear at a first position disengaged from the gear transmission assembly and allow the second gear to cross the limit stop member during the rotation of the second gear and deflect along the first direction with the swing arm to a second position engaged with the gear transmission assembly;

[0013] The paper limiting member is linked with the swing arm, so that it can maintain the paper blocking state when the second gear is at the first position and be in the non-paper blocking state when the second gear is at the second position.

[0014] The limit stop member can adopt components such as a gear (which can be a cylindrical gear or a sector gear, etc.) or a retaining piece (which can be understood as a tooth structure of a gear) that can both resist and limit the second gear in its swinging direction and can roll cooperate with the limit stop member during the rotation of the second gear. In order to simplify the structure of the limit stop member, the limit stop member is a retaining piece that can abut against the tooth groove position of the second gear, and this retaining piece only allows the second gear to cross the retaining piece and continue to deflect along the first direction or the second direction when rotating around its own axis.

[0015] The paper limiter and the swing arm may be linked together by a gear transmission mechanism, a connecting rod transmission mechanism, etc. Preferably, the paper limiter comprises a limiter rod whose extension direction is consistent with the extension direction of the paper pickup roller, and a paper stopper arranged at intervals along the extension direction of the limiter rod, the paper stopper extending radially outward from the outer peripheral wall of the limiter rod, the limiter rod is rotatably connected to the printer body around its own axis, and the limiter rod is connected to the swing arm through a connecting rod assembly.

[0016] As an improvement, the connecting rod assembly includes a first connecting rod and a second connecting rod, the first end of the first connecting rod is connected to the end of the limit rod, the second end is rotatably connected to the first end of the second connecting rod, the second end of the second connecting rod is rotatably connected to the swing arm, and the swing arm is eccentrically arranged relative to the rotation center of the swing arm at the position of rotationally connected to the second connecting rod.

[0017] In order to realize the rotational connection between the swing arm and the second connecting rod, the first end of the swing arm has a first pin shaft for rotationally constraining the second end of the second connecting rod.

[0018] In order to simplify the installation structure between the second end of the swing arm and the second gear and to ensure the stability of the second gear during its own axial rotation and the deflection of the swing arm, an arc-shaped slide groove centered on the first gear shaft is defined on the support frame, and the second end of the swing arm has a second gear shaft on which the second gear rotates, and the second gear shaft is slidably constrained in the arc-shaped slide groove.

[0019] As an improvement, the first gear also has an axially extending sleeve, the sleeve is sleeved outside the first gear shaft, the first end of the swing arm is sleeved on the sleeve, and the sleeve also has a radially outward extending stop portion at the end away from the first gear, and the stop portion abuts against the side of the swing arm away from the first gear.

[0020] The above structural design enables the first gear and the swing arm to rotate in the same direction under the action of friction (such as the friction between the swing arm and the outer wall of the sleeve). For example, when the first gear is driven to rotate by an external force, the swing arm can be driven to deflect. When the swing arm is driven to deflect by an external force, the first gear can also be driven to rotate. Of course, the friction between the first gear and the swing arm does not need to be too large. Therefore, when the swing arm deflects to the set position and cannot continue to rotate, the first gear can also continue to rotate independently.

[0021] In order to transmit the power of the external driving mechanism to the first gear, the support frame is also provided with a power gear assembly for connecting with the external driving mechanism, and the power gear assembly is meshed with the first gear.

[0022] Of course, when the spatial arrangement of the first gear in the printer main body can operate directly connected to an external power mechanism, the above-mentioned power gear assembly can also be omitted.

[0023] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a printer, including the above-mentioned paper feeding device.

[0024] Compared with the prior art, the advantages of the present invention are as follows: the second gear that deflects together with the swing arm can be limited by the limit stop to stay at the first position, and can also cross the limit stop during the rotation of the second gear (driven by an external force) around its own axis and deflect with the swing arm to engage with the gear transmission assembly of the paper feeding roller assembly at the second position. Among them, the swing arm is also linked with the paper limiting member. When the swing arm is in different positions, the paper limiting member can be correspondingly switched to the paper blocking state and the non-paper blocking state to realize the paper blocking function and the paper feeding operation. This paper blocking structure makes full use of the engagement and disengagement process between the second gear (power transmission) and the gear transmission assembly of the paper feeding roller assembly during the swing stroke of the swing arm, designs a limit stop that can keep the swing arm at an intermediate position, and then is linked with the paper limiting member. Its structural design is ingenious, realizing the paper blocking and paper feeding functions with fewer components, ensuring accurate limitation of the paper, and improving the printing efficiency. Description of the Drawings

[0025] Figure 1 is a three-dimensional structural schematic diagram of the paper feeding device for the printer according to the embodiment of the present invention;

[0026] Figure 2 is Figure 1 a three-dimensional structural schematic diagram after removing the base of the printer main body (the swing arm is in the initial position without paper);

[0027] Figure 3 is Figure 1 a three-dimensional structural schematic diagram after removing the base of the printer main body (the swing arm is in the first position state);

[0028] Figure 4 is Figure 1 a three-dimensional structural schematic diagram after removing the base of the printer main body (the swing arm is in the second position state);

[0029] Figure 5 is Figure 2 an exploded view of;

[0030] Figure 6 is a structural diagram of the paper feeding mechanism in the prior art. Detailed Embodiments

[0031] The present invention will be further described in detail below with reference to the embodiments in the drawings.

[0032] In the description and claims of the present invention, terms indicating directions such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various exemplary structural parts and elements of the present invention. However, the use of these terms herein is only for the purpose of convenience in description and is determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0033] See Figures 1-5 , a paper feeding device for a printer includes a paper feed roller assembly, a paper limiting member 20, a swing arm 40, a first gear 33, a second gear 43, and a power gear assembly 60.

[0034] Figure 1 A base 12 of a printer main body is shown. A paper support plate 121 is disposed at the rear side of the base 12 and is arranged to incline forward from top to bottom. Papers stacked together can be placed on the paper support plate 121. The printer main body generally has a paper feeding channel (not shown). The paper feed roller assembly and the paper limiting member 20 are both arranged in the paper feeding channel. Among them, along the moving direction of the paper, the paper limiting member 20 is located in front of the paper feed roller assembly. As Figure 1 shown, the paper feed roller assembly is disposed adjacent to the paper support plate 121 and can act on the papers placed in place on the paper support plate 121 to convey the papers forward. The paper limiting member 20 is disposed at the front side area position of the base 12 corresponding to the bottom of the paper support plate 121. The main body of the paper limiting assembly is located below the base 12, and the limiting portion of the paper limiting assembly extends upward and is exposed, so as to limit the end of the paper and achieve the purpose of blocking the paper.

[0035] The paper feed roller assembly includes a paper feed roller 10 and a gear transmission assembly 11 that is in transmission cooperation with the paper feed roller 10. The paper feed roller 10 extends horizontally, and a plurality of paper feed wheels 100 are arranged at intervals along its extending direction. The paper feed roller 10 is generally rotationally constrained on the main body of the printer. One end of the paper feed roller 10 is connected to a gear of the gear transmission assembly 11. When the gear transmission assembly 11 is driven by an external force, it can transmit power to the paper feed roller 10, thereby driving the paper feed roller 10 to rotate around its own axis. As Figure 1 shown, the gear transmission assembly 11 shows a plurality of gear members that are meshed with each other in sequence from bottom to top, and the uppermost gear member is coaxially connected to the paper feed roller 10.

[0036] Figure 2 For Figure 1A perspective view after removing components such as the base 12 and the paper supporting board can be seen. The paper limiting member 20 includes a limiting rod 21 extending horizontally (substantially in the same direction as the extending direction of the paper feeding roller 10) and a paper blocking portion 22 arranged at intervals along the extending direction of the limiting rod 21. The paper blocking portion 22 is a hook-shaped arm extending radially outward from the outer peripheral wall of the limiting rod 21, and the notch of the hook-shaped arm faces the paper, and is used to abut against the end of the paper to ensure the paper blocking effect. The above-mentioned paper limiting member 20 can rotate around the axis of the limiting rod 21, and at least has a paper blocking state of resisting on the front side of the paper to limit the forward movement of the paper and a non-paper blocking state of releasing the limitation of the paper to allow the paper to pass through. Among them, for the paper blocking state, reference can be made to Figure 3 , for the non-paper blocking state, reference can be made to Figure 4 , and Figure 2 shows the initial state without placing paper. After placing the paper, the paper (under the action of its own gravity) pushes the limiting rod 21 to rotate and switches to the state shown in Figure 3 . Specifically, the structure and process for realizing the above-mentioned switching limit will be described below.

[0037] Continue to refer to Figure 2 , it also shows a support frame 30, and the support frame 30 is a vertical plate structure extending in the front-rear direction. The gear transmission assembly 11, the first gear 33, and the power gear assembly 60 of the paper feeding roller assembly are all arranged on this support member. Specifically, in combination with Figure 5 , the support frame 30 has a first gear shaft 34, a third gear shaft 35, and a fourth gear correspondingly extending toward the side where the paper limiting member 20 is located. Among them, the first gear 33 is rotatably connected to the first gear shaft 34, the power gear assembly 60 is a two-stage gear with different diameters, and this two-stage gear is rotatably connected to the third gear shaft 35, and the lowermost gear of the gear transmission assembly 11 of the paper feeding roller assembly is rotatably connected to the fourth gear shaft 36.

[0038] Refer to Figure 5 , the middle part of the first gear 33 has a bushing 331 extending axially away from the support plate. The first gear 33 is rotatably connected to the first gear shaft 34 through the bushing 331. Among them, the length of the first gear shaft 34 is slightly greater than the length of the bushing 331. After the bushing 331 of the first gear 33 is sleeved on the first gear shaft 34, the end of the first gear shaft 34 can be exposed outside the port of the bushing 331. The end of the first gear shaft 34 is also axially limited to the bushing 331 by a screw and a washer connecting to this end position. The end of the bushing 331 of the first gear 33 away from the first gear 33 also has a stop portion 3310 extending radially outward. Specifically, the bushing 331 is axially provided with a groove, thereby forming an elastic arm that can elastically expand and contract in the inner-outer direction. The above-mentioned stop portion 3310 is located at the end of the elastic arm.

[0039] The first end of the swing arm 40 has a mounting hole 44, and the second end has a second gear shaft 42 extending towards the support plate. Among them, the swing arm 40 is sleeved outside the bushing 331 of the first gear 33 through the mounting hole. The mounting hole of the swing arm 40 has a limiting step 440 on the side corresponding to the bushing 331 of the first gear 33. After the swing arm 40 is mounted in place on the bushing 331 of the first gear 33, the stop portion 3310 on the elastic arm of the bushing 331 abuts against the limiting step 440 of the swing arm 40. More specifically, the inner diameter of the mounting hole 44 of the swing arm 40 is adapted to the outer diameter of the bushing 331 of the first gear 33. Thus, there is a certain frictional force between the swing arm 40 and the first gear 33. Of course, the abutting and cooperating of the above-mentioned stop portion 3310 and the swing arm 40 also make there be a certain frictional force between the two. In this way, the first gear 33 and the swing arm 40 can rotate in the same direction under the action of the frictional force (such as the frictional force between the swing arm 40 and the outer wall of the bushing 331). For example, when the first gear 33 is driven to rotate by an external force, it can drive the swing arm 40 to deflect, and when the swing arm 40 is driven to deflect by an external force, it can also drive the first gear 33 to rotate. Of course, the frictional force between the first gear 33 and the swing arm 40 does not have to be too large. Thus, when the swing arm 40 deflects to a set position and cannot continue to rotate, the first gear 33 can still rotate independently.

[0040] The second gear 43 is sleeved on the second gear shaft 42 of the swing arm 40 and can rotate freely. In this embodiment, after the swing arm 40 equipped with the second gear 43 is assembled in place on the bushing 331 of the first gear 33, the second gear 43 and the first gear 33 are always meshed. In this way, when the first gear 33 is driven to rotate by an external force, it can drive the second gear 43 to rotate.

[0041] Continue to refer to Figure 5 , the support frame 30 also has an arc-shaped chute 32, and the arc-shaped chute 32 is a circular arc-shaped chute 32 with the position where the first gear shaft 34 is located as the center of the circle. Among them, the end of the second gear shaft 42 at the second end of the swing arm 40 can extend into the arc-shaped chute 32 and can reciprocally slide along the extending direction of the mutual chute. The two ends of the above-mentioned arc-shaped chute 32 can limit the two extreme positions during the yawing process of the swing arm 40. Among them, the size of the central angle corresponding to the arc-shaped chute 32 can be selected according to the actual required swing angle of the swing arm 40.

[0042] The direction in which the swing arm 40 rotates towards the paper feed roller 10 is denoted as the first direction A1, and the direction in which the swing arm 40 rotates away from the paper feed roller 10 is denoted as the second direction A2. When the swing arm 40 deflects to the limit position along the first direction A1 (limited by one end of the arc-shaped chute 32), the second gear 43 on the swing arm 40 can just engage with the gear of the gear transmission assembly 11 of the paper feed roller assembly. In this way, when the first gear 33 is driven to rotate by an external force, the power can be transmitted to the gear transmission assembly 11 through the second gear 43, and then the paper feed roller 10 is driven to rotate. When the swing arm 40 deflects to the limit position along the second direction A2 (limited by the other end of the arc-shaped chute 32), the second gear 43 on the swing arm 40 disengages from the gear of the gear transmission assembly 11 of the paper feed roller assembly. At this time, the paper feed roller 10 is in a no-load state, and it is convenient to take out when paper jams occur.

[0043] An important inventive point of this embodiment is also that the limiting rod 21 of the paper limiting member 20 is also linked with the swing arm 40, so as to drive the paper limiting member 20 to switch to the paper blocking state and the non-paper blocking state during the deflection of the swing arm 40. Specifically, the limiting rod 21 is connected to the swing arm 40 through a link assembly. The link assembly includes a first link 51 and a second link 52. The first end of the first link 51 is fixedly connected to the end of the limiting rod 21, the second end is rotatably connected to the first end of the second link 52 through a second pin shaft 511, and the second end of the second link 52 is rotatably connected to the first pin shaft 41 at the first end of the swing arm 40. Wherein, both ends of the second link 52 are respectively provided with pin holes for rotatably cooperating with the first pin shaft 41 and the second pin shaft 511. The extending directions of the first pin shaft 41 and the second pin shaft 511 are both parallel to the extending direction of the limiting rod 21. The first pin shaft 41 on the swing arm 40 is also eccentrically arranged relative to the rotation center of the swing arm 40 (i.e., the first gear shaft 34). Among them, the eccentric distance of the first pin shaft 41 can be reasonably set according to the angle that the limiting rod 21 needs to rotate.

[0044] A limiting stop 31 is also provided on the support frame 30 of this embodiment. The limiting stop 31 is arranged on the moving path of the second gear 43 as the swing arm 40 swings, such as Figure 3As shown, the limit stop 31 is a baffle disposed above the arc-shaped chute 32 and extending vertically. Specifically, the position of the baffle is between the trajectory lines generated by the tooth tip and the tooth root when the second gear 43 rotates with the swing arm 40, and the thickness is less than the tooth pitch between two adjacent teeth of the second gear 43. In this way, during the deflection of the second gear 43 with the swing arm 40, the baffle can abut against the tooth groove position of the second gear 43. Since the second gear 43 is always meshed with the first gear 33 (and the first gear 33 is meshed with the power gear assembly 60), when the first gear 33 does not rotate, the second gear 43 will not rotate (at least not easily). In this case, the second gear 43 will not cross the baffle, causing the swing arm 40 to stay at this position. The position where the swing arm 40 stays is denoted as the first position. At this first position, the second gear 43 on the swing arm 40 is in a state of being disengaged from the gear transmission assembly 11 of the paper feed roller assembly. On the other hand, this baffle only allows the second gear 43 to cross the baffle and continue to swing in the first direction A1 or the second direction A2 when rotating around its own axis. As Figure 4 shown, when the second gear 43 (driven by the first gear 33) rotates, the second gear 43 can cross the baffle and swing with the swing arm 40 in the first direction A1 to the second position where it meshes with the gear transmission assembly 11. At this second position, the first gear 33 is driven to rotate by an external force, and the power is transmitted to the gear transmission assembly 11 through the second gear 43, thereby driving the paper feed roller 10 to rotate, realizing the paper feeding operation.

[0045] Since the paper stopper 20 is linked with the swing arm 40 through the link assembly, as Figure 3 shown, when the swing arm 40 is in the first position, the upper stop portion 3310 of the limit rod 21 can abut against the front end of the paper to limit the forward movement of the paper. At this time, the paper stopper 20 is in a paper blocking state. As Figure 4 shown, when the swing arm 40 deflects to the second position, the limit rod 21 deflects along the Figure 4 shown direction, and the height of the stop portion 3310 on the limit rod 21 decreases, releasing the limit on the front end of the paper and allowing the paper to move forward. At this time, the paper stopper 20 is in a non-paper blocking state.

[0046] The working process of the paper feeding device in this embodiment is as follows:

[0047] Refer to Figure 1 , when the printer is in an unprinted state, load the paper along the solid arrow direction. After the paper reaches the paper blocking portion 22 of the paper stopper 20, the paper will push the limit rod 21 to rotate in the S1 direction in Figure 2 , and it is transmitted to the swing arm 40 through the link assembly rotation. The swing arm 40 will deflect in the first direction A1, and at the same time drive the second gear 43 to move along the arc-shaped chute 32. When it moves to Figure 3In the first position shown, the second gear 43 will be blocked by the blocking piece. Since the printer is not in working state, the second gear 43 is not driven by the driving mechanism and is in a stationary state. Then, the second gear 43 will be blocked at the position where the blocking piece is located and cannot pass through. The limiting rod 21 cannot continue to rotate, thereby limiting the paper.

[0048] See also Figure 4 When the printer is working normally, the driving mechanism drives the power gear assembly 60 to rotate in the direction of C1, the power gear assembly 60 drives the first gear 33 to rotate in the direction of B1, the first gear 33 then drives the second gear 43 to rotate in the direction of D1, the second gear 43 will smoothly pass through the blocking piece on the support frame 30, the swing arm 40 continues to deflect in the first direction A1, and at the same time, drives the limit rod 21 to deflect in the direction of S2 to Figure 4 In the non-paper blocking state shown, the second gear 43 eventually deflects to the second position along with the swing arm 40 and meshes with the gear transmission assembly 11 of the paper pickup roller assembly to achieve normal paper feeding function.

[0049] After the paper feeding is completed, the driving mechanism drives the power gear assembly 60 to rotate along the C2 direction, the power gear assembly 60 drives the first gear 33 to rotate along the B2 direction, and drives the swing arm 40 to deflect along the second direction A2. Since the first gear 33 drives the second gear 43 to rotate along the D2 direction, the second gear 43 can also smoothly pass through the blocking piece on the support frame 30, thereby, the swing arm 40 can continue to deflect along the second direction A2 to Figure 2 At the same time, the swing arm 40 drives the limit rod 21 along the connecting rod assembly Figure 4 The S3 direction shown is deflected to Figure 2 Position shown.

[0050] On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the relevant technical features. The limit stopper 31 is not limited to the stopper structure, and it can also be a fixed gear fixed relative to the support frame 30, wherein the fixed gear can be a cylindrical gear or a sector gear, and the fixed gear can also limit the second gear 43 in its deflection direction, and can roll with the second gear 43 (rotation process), thereby allowing the second gear 43 to continue to deflect over the fixed gear during the rotation process.

Claims

1. A paper feeding device for a printer, comprising: A paper feeding roller assembly, including a paper feeding roller (10) and a gear transmission assembly (11) in transmission cooperation with the paper feeding roller (10), and the gear transmission assembly (11) is driven by an external force to drive the paper feeding roller (10) to rotate around its own axis; A paper limiting member (20), located in front of the paper feeding roller (10) along the paper transmission direction, and the paper limiting member (20) can rotate around a straight line parallel to the paper feeding roller (10) as the rotation center, and at least has a paper blocking state of resisting the front side of the paper to limit the forward movement of the paper and a non-paper blocking state of releasing the limitation of the paper to allow the paper to pass; It is characterized by further comprising: A first gear (33), rotatably arranged on a first gear shaft (34) of a support frame (30) in a manner that can rotate around its own axis; A swing arm (40), the first end of which is rotatably arranged on the first gear shaft (34), and can be reciprocally deflected within a set angle range by the drive of the first gear (33). A second gear (43) that can freely rotate is provided at the second end of the swing arm (40), and the second gear (43) meshes with the first gear (33). The direction in which the swing arm (40) rotates towards the paper feeding roller (10) is denoted as the first direction (A1), and the direction in which the swing arm (40) rotates away from the paper feeding roller (10) is denoted as the second direction (A2); A limit stop member (31), arranged on the moving path of the second gear (43) as it deflects with the swing arm (40), and is configured to: be able to abut against the teeth of the second gear (43) to limit the second gear (43) at a first position disengaged from the gear transmission assembly (11) and be able to allow the second gear (43) to cross over the limit stop member (31) when the second gear (43) rotates and deflect along the first direction (A1) with the swing arm (40) to a second position engaged with the gear transmission assembly (11); The paper limiting member (20) is linked with the swing arm (40), so as to be able to maintain the paper blocking state when the second gear (43) is at the first position and be in the non-paper blocking state when the second gear (43) is at the second position.

2. The paper feeding device for a printer according to claim 1, characterized in that: The limit stop member (31) is a retaining piece that can abut against the tooth groove position of the second gear (43), and this retaining piece only allows the second gear (43) to cross over this retaining piece and continue to deflect along the first direction (A1) or the second direction (A2) when rotating around its own axis.

3. The paper feeding device for a printer according to claim 1 or 2, characterized in that: The paper limiting member (20) includes a limiting rod (21) whose extending direction is consistent with the extending direction of the paper feeding roller (10) and paper blocking portions (22) arranged at intervals along the extending direction of the limiting rod (21). The paper blocking portions (22) extend radially outward from the outer peripheral wall of the limiting rod (21). The limiting rod (21) is rotatably connected to the printer main body in a manner that can rotate around its own axis, and the limiting rod (21) is connected to the swing arm (40) through a link assembly.

4. The paper feeding device for a printer according to claim 3, characterized in that: The connecting rod assembly comprises a first connecting rod (51) and a second connecting rod (52), wherein the first end of the first connecting rod (51) is connected to the end of the limiting rod (21), and the second end is rotationally connected to the first end of the second connecting rod (52), and the second end of the second connecting rod (52) is rotationally connected to the swing arm (40), and the swing arm (40) is eccentrically arranged relative to the rotation center of the swing arm (40) at the position where it is rotationally connected to the second connecting rod (52).

5. The paper feeding device for a printer according to claim 4, characterized in that: The first end of the swing arm (40) has a first pin shaft (41) on which the second end of the second connecting rod (52) is rotationally constrained.

6. The paper feeding device for a printer according to claim 1 or 2, characterized in that: The support frame (30) defines an arc-shaped slide groove (32) centered on the first gear shaft (34), and the second end of the swing arm (40) has a second gear shaft (42) for the second gear (43) to rotate thereon, and the second gear shaft (42) is slidably constrained in the arc-shaped slide groove (32).

7. The paper feeding device for a printer according to claim 1 or 2, characterized in that: The first gear (33) also has a shaft sleeve (331) extending in the axial direction, the shaft sleeve (331) is sleeved outside the first gear shaft (34), the first end of the swing arm (40) is sleeved on the shaft sleeve (331), and the shaft sleeve (331) also has a stopper (3310) extending radially outward at an end away from the first gear (33), and the stopper (3310) abuts against a side of the swing arm (40) away from the first gear (33).

8. The paper feeding device for a printer according to claim 1 or 2, characterized in that: The support frame (30) also has a power gear assembly (60) for connecting to an external driving mechanism, and the power gear assembly (60) is meshed with the first gear (33).

9. A printer, characterized in that: The invention comprises a paper feeding device for a printer according to any one of claims 1 to 8.

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