A paper stop mechanism

Abstract

The present invention relates to a paper blocking mechanism, comprising a rod body, a blocking bar connected to the rod body, a frame arranged at one end of the rod body, and a driving mechanism connected between the frame and the rod body, characterized in that: the driving mechanism comprises a driving component and a transmission component, the transmission component is connected between the driving component and the rod body, and a torsion spring capable of being compressed in the rotation direction of the rod body is arranged between the transmission component and the rod body. The paper blocking mechanism can normally complete the paper blocking work under the condition of placing different amounts of paper on the basis of increasing the swing angle range of the blocking bar, thereby reducing the probability of paper rubbing and re-feeding caused by improper paper placement or paper sliding during the last printing, reducing paper waste, and improving customer satisfaction.

Description

Technical Field

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

[0002] Before the printer starts printing, the first step is to rub the paper in. As the paper is rubbed in, it will drive the paper below to slide inward. Especially for the paper placed at an angle, the paper will slide down more seriously. For example, the Chinese invention patent "Paper Alignment Device" with authorization announcement number CN1107014C (patent number 99802916.5) discloses a printer in which the paper is placed at an angle. During the paper feeding process, the paper is prone to slide down. Therefore, in order to avoid the paper sliding and affecting the normal paper feeding, the paper blocking mechanism needs to be used to block the paper before rubbing the paper in. After completion, the stop bar in the paper blocking mechanism must return to the lowest point to avoid obstruction to the paper rubbing action. When the paper enters the printing stage, the stop bar returns to the maximum paper position until the next printing starts and the above action is repeated.

[0003] The Chinese invention patent "Paper feeding device, paper processing device using the paper feeding device, and imaging device" with publication number CN109715537A (application number 201780054280.6) states that the alignment member can be coupled to a pivot shaft, and a rod is arranged on one end of the pivot shaft. The rod can be fixed to the pivot shaft, and the cam gear switches the alignment member between the alignment position and the transmission-allowed position according to the rotation phase of the cam gear. The cam gear may include a gear portion and a cam portion. A toothless portion is partially provided on the gear portion. The cam portion has a cam profile for switching the alignment member between the alignment position and the transmission-allowed position. The cam portion is connected to the rod. The cam portion can contact the rod and pivot the pivot shaft to switch the alignment member to the alignment position. When the contact between the cam portion and the rod is terminated, the retainer presses the alignment member due to the elastic force of the first elastic member, so that the alignment member can pivot to the transmission-allowed position. However, in this structure, since the length of the rod is fixed, the rotation angle of the pivot shaft is limited, and the alignment member cannot be driven to pivot to the transmission-permitting position, and an additional component is required to complete this action. In addition, when this structure is used in a printer that places paper at an angle, when a large amount of paper or very little paper is placed, the alignment member may get stuck or be unable to swing to a position to align a small amount of paper due to the limited swing angle. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a paper blocking mechanism for a printer which can adjust the swing angle range of the blocking bar while keeping the driving angle unchanged so as to normally complete the paper blocking work when different amounts of paper are placed.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a paper blocking mechanism, including a rod body, a blocking bar connected to the rod body, a frame arranged at one end of the rod body, and a driving mechanism connected between the frame and the rod body, characterized in that: the driving mechanism includes a driving component and a transmission component that can drive the blocking bar to swing within a position aligned with the least paper and a position allowing paper to pass, the transmission component is connected between the driving component and the rod body, and a torsion spring that can be compressed in the rotation direction of the rod body is arranged between the transmission component and the rod body.

[0006] In order to facilitate the connection between the transmission assembly and the rod body, the transmission assembly includes a first transmission member arranged at the end of the rod body, and a linkage plate extends axially outward at the end of the rod body. The linkage plate is connected to the first transmission member along the circumferential limit direction through the two ends of the torsion spring.

[0007] The structure is simple and easy to install. The first transmission member is provided with a groove facing the rod body opening, and the torsion spring is arranged in the groove; a limiting hole is provided on the groove wall of the groove, one end of the torsion spring is matched and inserted into the limiting hole, and a limiting notch is also provided on the groove wall of the groove to allow the other end of the torsion spring to swing circumferentially, the other end of the torsion spring is against one side edge of the limiting notch, and the linkage piece extends into the groove and is circumferentially limited between the two ends of the torsion spring.

[0008] In order to ensure that the rod body can rotate circumferentially more smoothly, the cross-section of the linkage piece is arc-shaped.

[0009] Preferably, the central angle corresponding to the limiting notch is less than 90°.

[0010] In order to facilitate the limited installation and avoid lateral movement, a connecting portion is extended axially at the end of the rod body, the linkage piece extends outward from the connecting portion, and the first transmission member is sleeved on the connecting portion of the rod body through a groove.

[0011] Preferably, the transmission assembly further comprises a second transmission member rotatably connected to the frame, and a third transmission member eccentrically connected to the first transmission member and the second transmission member respectively.

[0012] Preferably, a connecting arm is radially extended on the second transmission member, a transmission rod is connected to the connecting arm, and an arc-shaped hole for the transmission rod to be placed in and matching the swing range of the transmission rod is provided on the frame.

[0013] The structure is simple. The driving assembly comprises a driving source and a planetary gear set arranged on a frame. The driving source is drivingly connected to an input wheel in the planetary gear set. The output wheel sleeve in the planetary gear set is arranged on a transmission rod.

[0014] Preferably, the driving source is a motor.

[0015] Compared with the prior art, the advantages of the present invention are: the paper blocking mechanism in the present invention can drive the baffle on the rod body to swing within the range between the minimum paper alignment position and the paper transmission position allowed, and when different numbers of paper are placed so that the baffle cannot swing to the minimum paper alignment position, the torsion spring can be used to make the transmission component and the rod body rotate relative to each other due to the compression of the torsion spring, that is, when the transmission component rotates, the rod body can not rotate, so that the transmission component can operate normally. Therefore, on the basis of increasing the swing angle range of the baffle, the paper blocking mechanism can normally complete the paper blocking work when different amounts of paper are placed, thereby reducing the probability of paper rubbing and re-feeding caused by improper paper placement or paper sliding during the last printing, reducing paper waste and improving customer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the paper blocking mechanism in an embodiment of the present invention.

[0017] Figure 2 It is a three-dimensional exploded view of the paper blocking mechanism in an embodiment of the present invention.

[0018] Figure 3 2 is a cross-sectional view of a paper stop mechanism in an embodiment of the present invention.

[0019] Figure 4 Schematic diagram of the installation of the paper stop mechanism in the printer according to the embodiment of the present invention. DETAILED DESCRIPTION

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

[0021] like Figures 1 to 4 As shown, the paper blocking mechanism in this embodiment includes a rod body 1, a blocking bar 2, a frame 3, a driving mechanism and a torsion spring 4.

[0022] The rod body 1 is rotatably limited and installed in the housing of the printer, and the stop bar 2 is connected to the rod body 1 to align the paper placed in the printer. A plurality of stop bars 2 can be provided as needed, and each stop bar 2 is connected to the rod body 1 at intervals, so that the stop bar 2 can swing with the rotation of the rod body 1, thereby realizing the alignment of the paper and allowing the paper to pass through for printing.

[0023] The driving mechanism in this embodiment is connected to the rod body 1 in transmission connection, and is further used to drive the rod body 1 to rotate. The driving mechanism includes a driving assembly (not shown in the figure) and a transmission assembly connected to the driving assembly, wherein the driving assembly includes a driving source and a planetary gear set connected to the output end of the driving source. The driving source in this embodiment is a motor, and the output end of the driving source is connected to the input wheel in the planetary gear set. The transmission assembly is connected between the output wheel in the planetary gear set and the rod body 1, and a torsion spring 4 that can be compressed in the rotation direction of the rod body 1 is arranged between the transmission assembly and the rod body 1.

[0024] like Figures 1 to 3 As shown, the specific transmission assembly includes a first transmission member 5 , a second transmission member 6 and a third transmission member 7 .

[0025] like Figure 3 As shown, the first transmission member 5 is arranged at the end of the rod body 1, and the first transmission member 5 is provided with a groove 51 which is open to the rod body 1, and the torsion spring 4 is arranged in the groove 51. A limiting hole 52 is provided on the groove wall of the groove 51, and one end of the torsion spring 4 is matched and inserted into the limiting hole 52. In this embodiment, an axis is provided in the center of the groove 51, and the torsion spring 4 is sleeved on the axis. A limiting notch 53 is also provided on the groove wall of the groove 51 to allow the other end of the torsion spring 4 to swing circumferentially, and the other end of the torsion spring 4 is against one side of the limiting notch 53. The central angle corresponding to the limiting notch 53 is less than 90°. In this way, there is a compression amount of less than 90° between the two ends of the torsion spring 4 in the circumferential direction.

[0026] The end of the rod body 1 is provided with a connecting portion 12 extending axially, and a linkage piece 11 with an arc-shaped cross section continues to extend outwardly from the connecting portion 12 in the axial direction. The first transmission member 5 is sleeved on the connecting portion 12 of the rod body 1 through a groove 51, thereby realizing connection with the rod body 1. The linkage piece 11 extends into the groove 51 and is circumferentially limited between the two ends of the torsion spring 4. Since the setting positions of the frame 3 and the rod body 1 in the printer are relatively fixed, this structure ensures the firmness of the connection between the rod body 1 and the first transmission member 5, and the force of the torsion spring 4 is sufficient to realize the synchronous rotation of the linkage piece 11 and the first transmission member 5.

[0027] The second transmission member 6 is rotatably connected to the frame 3 through an axis on the frame 3. A connecting arm 61 is radially extended on the second transmission member 6. A transmission rod 62 is connected to the connecting arm 61 in a direction perpendicular to the plane where the connecting arm 61 is located. The output wheel in the planetary gear set is sleeved on the transmission rod 62. An arc hole 31 is provided on the frame 3 for the transmission rod 62 to be placed in and matches the swing range of the transmission rod 62.

[0028] Both ends of the second transmission member 6 are eccentrically connected to the first transmission member 5 and the third transmission member 7 respectively.

[0029] In this embodiment, the rotational relationship between the transmission assembly and the rod body 1 is: when the driving transmission rod 62 is rotated about 65° around the axis in one direction, through the relative relationship between the third transmission and the first transmission member 5, the gear bar first rotates 50° to reach the position with the least paper, and then reverses 100° to reach the position allowing the paper to be transmitted through.

[0030] The working process of the paper blocking mechanism in this embodiment is as follows: Figure 3 As shown, the initial position of the baffle 2 is the position where the baffle 2 is aligned with the paper when a standard number of sheets of paper are placed in the printer. After the printer receives the printing instruction, the motor is controlled to work, thereby driving the planetary gear set to rotate, thereby driving the transmission rod 62 to rotate, and the corresponding second transmission member 6 to rotate, thereby driving the third transmission member 7 and the first transmission member 5 to rotate, and under the action of the connection between the first transmission member 5 and the rod body 1, the baffle 2 is driven to swing in the direction of aligning the paper. If there are only one or two sheets of paper in the printer at this time, the torsion spring 4 maintains the initial position, driving the rod body 1 to rotate synchronously relative to the first transmission member 5, and then driving the baffle 22 to gradually swing to the position where the least amount of paper is placed to align, thereby aligning the paper placed in the printer. If a large amount of paper is placed in the printer at this time, when the baffle 2 is driven to swing to the position where the existing paper is aligned, the baffle 2 can no longer continue to swing, the first transmission member 5 continues to rotate, and the linkage piece 11 stops moving. At this time, the linkage piece 11 will compress the end of the torsion spring 4 to swing into the limiting notch 53, avoiding the situation where the first transmission member 5 cannot rotate. As the motor continues to rotate, the first transmission member 5 continues to rotate, and under the working action of the transmission component, the baffle 2 is driven to swing in the direction that allows the paper to be transmitted through. If there are more papers placed in the printer, the compressed torsion spring 4 is gradually released and finally reset to the initial position. The first transmission member 5 drives the linkage piece 11 to move synchronously, and then gradually drives the baffle 2 to fall completely so that the paper can be transmitted through. Then, the printer will perform paper rubbing. After the paper rubbing is completed, while the printer is printing, the motor will be controlled to reverse, and then the first transmission member 5 will be driven to reverse, and then the rod body 1 will be driven to rotate, so that the baffle 2 will gradually reset to the initial position. This is repeated to achieve paper feeding of the printer. During the entire working process, the drive source, the transmission component, and the drive component have stable transmission, and a large and stable force is output when aligning the paper, and the baffle 2 can be driven to swing at a large angle, and the normal operation of the printer can be guaranteed when different numbers of papers are placed in the printer. In this way, the probability of paper rubbing and re-feeding caused by improper paper placement or paper sliding during the last printing is reduced, paper waste is reduced, and customer satisfaction is improved.

Claims

1. A paper blocking mechanism, comprising a rod (1), a blocking bar (2) connected to the rod (1), a frame (3) arranged at one end of the rod (1), and a driving mechanism connected between the frame (3) and the rod (1), characterized in that: The driving mechanism comprises a driving assembly and a transmission assembly, wherein the transmission assembly is connected between the driving assembly and the rod body (1), and a torsion spring (4) capable of being compressed in the rotation direction of the rod body (1) is arranged between the transmission assembly and the rod body (1); The transmission assembly comprises a first transmission member (5) arranged at the end of a rod body (1); a linkage piece (11) is extended axially outward from the end of the rod body (1); the linkage piece (11) is connected to the first transmission member (5) in a circumferentially limited manner through the two ends of the torsion spring (4); The first transmission member (5) is provided with a groove (51) opening toward the rod body (1), and the torsion spring (4) is arranged in the groove (51); a limiting hole (52) is provided on the groove wall of the groove (51), and one end of the torsion spring (4) is matched and inserted into the limiting hole (52); the groove wall of the groove (51) is also provided with a limiting notch (53) for allowing the other end of the torsion spring (4) to swing circumferentially; the other end of the torsion spring (4) abuts against one side of the limiting notch (53), and the linkage piece (11) extends into the groove (51) and is limited between the two ends of the torsion spring (4) along the circumferential direction.

2. The paper blocking mechanism according to claim 1, characterized in that: The cross section of the linkage piece (11) is arc-shaped.

3. The paper blocking mechanism according to claim 1 or 2, characterized in that: The center angle corresponding to the limiting notch (53) is less than 90°.

4. The paper blocking mechanism according to claim 1 or 2, characterized in that: A connecting portion (12) is axially extended at the end of the rod body (1), the linkage piece (11) extends outward from the connecting portion (12), and the first transmission member (5) is sleeved on the connecting portion (12) of the rod body (1) through a groove (51).

5. The paper blocking mechanism according to claim 1 or 2, characterized in that: The transmission assembly further comprises a second transmission member (6) rotatably connected to the frame (3), and a third transmission member (7) eccentrically connected to the first transmission member (5) and the second transmission member (6) respectively.

6. The paper blocking mechanism according to claim 5, characterized in that: The second transmission member (6) is provided with a connecting arm (61) extending radially, the connecting arm (61) is connected to a transmission rod (62), and the frame (3) is provided with an arc-shaped hole (31) for the transmission rod (62) to be placed in and matching the swing range of the transmission rod (62).

7. The paper blocking mechanism according to claim 5, characterized in that: The driving assembly comprises a driving source and a planetary gear set arranged on a frame (3); the driving source is drivingly connected to an input gear in the planetary gear set; and the output gear in the planetary gear set is sleeved on a driving rod (62).

8. The paper blocking mechanism according to claim 7, characterized in that: The driving source is a motor.

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