A duplex printer

Abstract

The present invention relates to a double-sided printer, comprising a machine body; a paper box installed in the machine body; a paper return channel arranged in the machine body; a partition plate rotatably connected to the machine body, the partition plate is located above the paper box and connected with the paper output end of the paper return channel; a paper pickup mechanism, a first end of which is provided with a first paper pickup wheel for rubbing the paper above the partition plate, and a second end of which is provided with a second paper pickup wheel for rubbing the paper in the paper box, the paper pickup mechanism and the partition plate are linked to each other so that one of the first paper pickup wheel and the second paper pickup wheel works. The double-sided printer can isolate the paper sent back after printing one side from the paper box inside the paper box, thereby completely avoiding the problem of paper re-feeding when printing the second side of the paper.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and particularly relates to a duplex printer. Background Art

[0002] In the existing duplex printing technology, the paper printed on the first side will return to the paper tray for printing on the second side. However, after the paper has been printed once, the paper will have a certain degree of upward curling. When it returns to the paper tray for printing on the second side, paper re-feed is likely to occur.

[0003] For example, in the Chinese invention patent "Printer and Its Duplex Printing Mode Control Method" with the authorization announcement number CN1892465B (application number 200610094186.7), the printer disclosed therein is provided with a printing path inside to achieve duplex printing. The printing medium is supplied to the printing unit along the printing path so as to print an image on the first side of the printing medium; a discharge path, wherein, in the normal printing mode, the printing medium printed with an image on its first side is discharged from the printer along the discharge path, or in the duplex printing mode, the printing medium is partially discharged from the printer along the discharge path; and a flipping path, starting from a partial discharge position of the discharge path and transporting the printing medium towards the starting point of the printing path to a position where the printing medium is to be transported along the printing path, so as to print other images on the second side of the printing medium. Part of the flipping path coincides with the paper feeding position. After flipping, the paper will fall on the new paper. Since the paper that has been printed once is more likely to curl up, the printed paper will rest on the separation wall, and thus will be simultaneously fed into the printing path during paper feeding, so the problem of paper re-feed is likely to occur. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a duplex printer that can isolate the paper that has been printed on one side and sent back from the paper in the paper tray, so as to avoid the problem of paper re-feed during the second-side printing.

[0005] The technical solution adopted by the present invention to solve the above technical problem is: a duplex printer, comprising

[0006] a machine body;

[0007] a paper tray, installed inside the machine body;

[0008] a paper return channel, provided inside the machine body;

[0009] Characterized in that: it further comprises

[0010] a partition board, rotatably connected to the machine body, the partition board is located above the paper tray and is connected to the paper outlet end of the paper return channel;

[0011] Paper feeding mechanism, with a first paper feeding wheel provided at the first end for feeding the paper above the partition board, and a second paper feeding wheel provided at the second end for feeding the paper in the paper cassette. The paper feeding mechanism is linked and cooperated with the partition board so that one of the first paper feeding wheel and the second paper feeding wheel performs the paper feeding work.

[0012] With a simple structure and simple working control, the paper feeding mechanism is arranged above the partition board. The first paper feeding wheel and the second paper feeding wheel are arranged and distributed along the paper feeding direction and are drivingly connected.

[0013] The first paper feeding wheel is rotatably connected to the machine body through a transmission shaft and is located above the partition board. The second paper feeding wheel swings up and down relative to the paper cassette corresponding to the paper outlet end position of the paper cassette.

[0014] The first end of the partition board is rotatably connected to the machine body. The second end of the partition board extends to the paper inlet end of the paper cassette. The second end of the partition board is linked with the second paper feeding wheel and swings up and down relative to the paper cassette. And there is a notch on the second end of the partition board for the second paper feeding wheel to pass through and contact the paper in the paper cassette.

[0015] Preferably, the first paper feeding wheel and the second paper feeding wheel are drivingly connected through a transmission mechanism.

[0016] The transmission mechanism includes a connecting arm with an installation groove, and a driving wheel, a driven wheel and a first gear set arranged in the installation groove. The transmission shaft passes through the first end of the connecting arm. The driving wheel is arranged on the transmission shaft. A wheel shaft passes through the second end of the connecting arm. The second paper feeding wheel and the driven wheel are both arranged on the wheel shaft. The first gear set is meshed with the driving wheel and the driven wheel respectively.

[0017] Simply, a linkage shaft is connected to the second end of the connecting arm, and a limiting component linked with the linkage shaft is arranged on the partition board.

[0018] With a simple structure, the limiting component includes a base body, and a through hole for the linkage shaft to penetrate is provided on the base body.

[0019] In order to facilitate the adjustment of the friction force when the first paper feeding wheel feeds the paper on the partition board, the limiting component further includes a first elastic member and a plate body. The plate body is connected to the inner top surface of the base body through the first elastic member.

[0020] In order to improve the paper feeding effect, two first paper feeding wheels are provided and are located on both sides of the connecting arm; two second paper feeding wheels are provided and are located on both sides of the connecting arm.

[0021] To ensure the meshing effect between the first gear set and the driving wheel and the driven wheel, connecting shafts are fixedly arranged in the mounting grooves of the connecting arms corresponding to the gears in the first gear set. The gears in the first gear set are sleeved on the corresponding connecting shafts. Limiting plates are arranged on both sides of the gears on the connecting shafts, and a second elastic member is arranged between the limiting plate of at least one connecting shaft and the side wall of the mounting groove.

[0022] Preferably, a driving mechanism capable of driving the transmission shaft to rotate is arranged on the machine body. The driving mechanism includes a motor and a second gear set connected to the driving end of the motor. The transmission shaft is connected to the output gear of the second gear set.

[0023] For more convenient paper feeding work on the partition, the first paper feeding wheel is located above the middle of the partition, and a rotatable friction wheel is arranged on the upper surface of the partition corresponding to the first paper feeding wheel.

[0024] Compared with the prior art, the advantages of the present invention are as follows: In the duplex printer of the present invention, the partition is connected to the paper return channel. Thus, when printing the content on the second side during duplex printing, the paper printed with the content on the first side sent out by the paper return channel directly moves above the partition. The partition isolates the paper cassette space, preventing the paper sent out by the paper return channel from entering the paper cassette. It cooperates with the first paper feeding wheel to complete paper feeding, and then realizes the printing of the content on the second side. When the first paper feeding wheel feeds the paper on the partition, it completely avoids the situation of paper refeeding that occurs when feeding the paper to be printed on the second side from the paper cassette in the prior art, and the printing efficiency is higher. Moreover, when the partition cooperates with the second paper feeding wheel to perform the paper rubbing action in the paper cassette, it can play a role in pressing the paper, which can also reduce the probability of paper refeeding and improve the printing efficiency. Description of the Drawings

[0025] Figure 1 It is a three-dimensional view of the duplex printer in the embodiment of the present invention when printing the content on the first side of the paper.

[0026] Figure 2 It is a three-dimensional view of the duplex printer in the embodiment of the present invention when printing the content on the second side of the paper.

[0027] Figure 3 It is Figure 2 a partial enlarged view of

[0028] Figure 4 It is a cross-sectional view of the duplex printer in the embodiment of the present invention when printing the content on the first side of the paper.

[0029] Figure 5 It is a cross-sectional view of the duplex printer in the embodiment of the present invention when printing the content on the second side of the paper. Detailed Embodiments

[0030] The present invention is further described in detail below with reference to the accompanying drawings.

[0031] like Figures 1 to 5 As shown, the double-sided printer in this embodiment includes a body 1, a paper box 2, a paper return channel 3, a partition 4, a paper pickup mechanism and a driving mechanism.

[0032] The paper box 2 is installed in the body 1, and the installation position of the paper box 2 in the body 1 is specifically set according to needs. For example, the paper box 2 in this embodiment is installed at the bottom of the body 1. The paper box 2 is usually installed in the body 1 in a detachable manner and can be pulled out relative to the body 1 to place paper.

[0033] One end of the paper box 2 is connected to the paper feed channel in the body 1 as a paper feed end. In order to achieve double-sided printing, the body 1 in this embodiment also has a paper return channel 3, and the paper output end of the paper return channel 3 is located at the end of the paper box 2 away from the paper feed end.

[0034] The partition 4 is located above the paper box 2, and the first end of the partition 4 is connected to the paper outlet end of the paper return channel 3. Specifically, the first end of the partition 4 is rotatably connected to the body 1, so that the second end of the partition 4 can swing up and down, and the second end of the partition 4 extends to the paper feed end of the paper box 2. The second end of the partition 4 droops under the action of its own weight and can press on the paper in the paper box 2, which can effectively ensure the reliability of paper feeding in the paper box 2. The rotation connection method of the partition 4 on the body 1 is specifically set according to the specific distribution of other component structures in the body 1. For example, the two sides of the first end of the partition 4 can be respectively provided with connecting columns and rotatably connected to the two side walls of the body 1.

[0035] The pickup mechanism is arranged above the partition 4. The pickup mechanism includes a first pickup wheel 5, a second pickup wheel 6 and a transmission mechanism 7. The first pickup wheel 5 and the second pickup wheel 6 are arranged along the paper feeding direction and are connected by the transmission mechanism 7, so that the pickup mechanism is a component extending along the paper feeding direction.

[0036] Specifically, the first end of the paper pickup mechanism is a first paper pickup wheel 5, and the first paper pickup wheel 5 is located above the middle of the partition 4. The first paper pickup wheel 5 is rotatably connected to the machine body 1 through a transmission shaft 51, and the machine body 1 is provided with a driving mechanism capable of driving the transmission shaft 51 to rotate, and the driving mechanism includes a motor 100, a second gear set 101 connected to the driving end of the motor 100, and the transmission shaft 51 is connected to the output gear of the second gear set 101.

[0037] A rotatable friction wheel 42 is provided on the upper surface of the partition 4 corresponding to the first pickup wheel 5 , so that the first pickup wheel 5 can cooperate with the friction wheel 42 to rub the paper above the partition 4 into the paper feed channel.

[0038] The second end of the paper feeding mechanism is the second paper feeding wheel 6, which is arranged corresponding to the paper outlet end position of the paper box 2 and can swing up and down relative to the paper box 2. Specifically, the second paper feeding wheel 6 is driven by a driving mechanism to cooperate with the transmission mechanism 7 to realize the up and down swing.

[0039] The transmission mechanism 7 includes a connecting arm 71 with an installation groove, and a driving wheel 72, a driven wheel 73 and a first gear set 74 arranged in the installation groove. The transmission shaft 51 passes through and is fixedly connected to the first end of the connecting arm 71. The driving wheel 72 is arranged on the transmission shaft 51. A wheel shaft 711 passes through the second end of the connecting arm 71. Both the second paper feeding wheel 6 and the driven wheel 73 are arranged on the wheel shaft 711. The first gear set 74 meshes with the driving wheel 72 and the driven wheel 73 respectively. Connecting shafts are fixedly arranged in the installation groove of the connecting arm 71 corresponding to the gears in the first gear set 74. The gears in the first gear set 74 are sleeved on the corresponding connecting shafts. Limiting plates are arranged on both sides of the gears on the connecting shafts. A second elastic member is arranged between the limiting plate of at least one connecting shaft and the side wall of the installation groove. The second elastic member can effectively adjust the meshing degree between the gears in the first gear.

[0040] In order to ensure the balance during paper feeding, two first paper feeding wheels 5 are arranged on both sides of the connecting arm 71, and two second paper feeding wheels 6 are also arranged on both sides of the connecting arm 71.

[0041] When the driving mechanism drives the first paper feeding wheel 5 to rotate forward and backward, through the action of the first gear set 74, the second paper feeding wheel 6 is driven to rotate. Since the position of the transmission shaft 51 remains unchanged, the connecting arm 71 will rotate with the transmission shaft 51 as the rotation axis, driving the second paper feeding wheel 6 to swing up and down relative to the paper box 2.

[0042] The second end of the partition plate 4 is linked with the second paper feeding wheel 6 and swings up and down relative to the paper box 2. Specifically, a linkage shaft 8 is connected to the second end of the connecting arm 71, and a limiting component 9 linked with the linkage shaft 8 is arranged on the partition plate 4. The limiting component 9 includes a base body 91, a first elastic member 92 and a plate body 93. The base body 91 has a through hole 911 for the linkage shaft 8 to penetrate, and the distance in the up and down direction of the through hole 911 is greater than the diameter of the linkage shaft 8. The plate body 93 is connected to the inner top surface of the base body 91 through the first elastic member 92. Thus, as the second paper feeding wheel 6 swings up and down, the linkage shaft 8 is driven to swing up and down, and further, the partition plate 4 swings up and down under the cooperation of the linkage shaft 8 and the limiting component 9.

[0043] The second end of the partition plate 4 is provided with a notch 41 for the second paper feed roller 6 to pass through and contact the paper in the paper cassette 2. In this way, when the second paper feed roller 6 swings downward, the second end of the partition plate 4 also moves downward accordingly and presses on the paper in the paper cassette 2, and the second paper feed roller 6 can press on the paper in the paper cassette 2 through the position of the notch 41 on the partition plate 4, thereby rubbing the paper in the paper cassette 2 into the paper feed channel. When the connecting arm 71 drives the second paper feed roller 6 to swing upward, the linkage shaft 8 moves upward accordingly, and then drives the partition plate 4 to swing upward as well, so that the first paper feed roller 5 located above the middle of the partition plate 4 presses on the paper above the friction wheel 42 on the partition plate 4 to achieve the paper rubbing action. During this process, since the linkage shaft 8 abuts against the plate body 93, and the plate body 93 is connected to the base body 91 through the first elastic member 92, thus through the elastic force of the first elastic member 92, it can ensure that the pressure of the first paper feed roller 5 on the friction wheel 42 is appropriate, which is more conducive to the paper rubbing action.

[0044] Such as Figure 4 And Figure 5As shown, during the working process, the paper pickup mechanism and the partition 4 are linked to each other so that only one of the first paper pickup wheel 5 and the second paper pickup wheel 6 performs the paper pickup work. Specifically, the process of double-sided printing is as follows: when printing the first side, the second paper pickup wheel 6 is initially pressed on the paper in the paper box 2, and the partition 4 is also pressed on the paper in the paper box 2 accordingly. The driving mechanism drives the first paper pickup wheel 5 to rotate, and the rotation direction of the first paper pickup wheel 5 is controlled according to the specific meshing structure of the first gear group 74 in the transmission mechanism 7, so that the second end of the connecting arm 71 has a downward pressure tendency, thereby making the second paper pickup wheel 6 maintain a state of contact with the paper in the paper box 2, and the second paper pickup wheel 6 performs paper pickup, and the top paper in the paper box 2 enters the paper feed channel under the action of the second paper pickup wheel 6, and then the first side content on the paper is printed. After the first side content is printed, the double-sided printer performs the paper return action of the paper, and the paper is output from the paper return channel 3 to the partition 4. At this time, the driving mechanism drives the transmission shaft 51 and the first pickup roller 5 to rotate in the opposite direction, driving the second end of the connecting arm 71 to swing upward, and then driving the second pickup roller 6 to swing upward and away from the paper in the paper box 2. As the second end of the connecting arm 71 swings upward, the linkage shaft 8 is also driven to swing upward, and then the second end of the partition 4 is driven to swing upward, so that the first pickup roller 5 is pressed on the paper on the partition 4. The rotation action of the first pickup roller 5 realizes the paper picking work of the paper, driving the paper into the paper feed channel, and printing the second side of the paper. In this way, the double-sided printing work is completed. When printing the next sheet of paper, the driving mechanism drives the transmission shaft 51 and the first pickup roller 5 to adjust the rotation direction, and then drives the second end of the connecting arm 71 to move downward, so that the second pickup roller 6 is pressed on the paper in the paper box 2 through the notch 41 of the partition 4, and then the partition 4 also moves downward and presses on the paper in the paper box 2, and then repeats the above action to perform the double-sided printing work of the paper. This cycle is repeated until all the double-sided printing work is completed.

[0045] The double-sided printer of the present invention connects the partition 4 with the paper return channel 3, so that when printing the second side of the double-sided printing work, the paper sent out by the paper return channel 3 with the first side content printed on it is directly moved to the top of the partition 4, and the partition 4 is used to isolate the space of the paper box 2 to prevent the paper sent out by the paper return channel 3 from entering the paper box 2, and the first paper pickup wheel 5 is cooperated to complete the paper feeding, thereby realizing the printing of the second side content. When the first paper pickup wheel 5 performs the paper feeding work of the paper on the partition 4, the situation of paper re-feeding that occurs when the paper to be printed on the second side is fed from the paper box 2 in the prior art is completely avoided, and the printing efficiency is higher. In addition, the partition 4 can play a role of pressing the paper when cooperating with the second paper pickup wheel 6 to perform the paper picking action of the paper in the paper box 2, which can also reduce the probability of paper re-feeding and improve the printing efficiency.

Claims

1. A duplex printer, comprising a body (1); a paper cassette (2) installed inside the body (1); a paper return channel (3) provided inside the body (1); It is characterized in that: further comprising a partition plate (4) rotatably connected to the body (1), the partition plate (4) being located above the paper cassette (2) and connected to the paper outlet end of the paper return channel (3); a paper feeding mechanism, with a first paper feeding wheel (5) for feeding the paper above the partition plate (4) provided at the first end and a second paper feeding wheel (6) for feeding the paper inside the paper cassette (2) provided at the second end, the paper feeding mechanism being in linkage cooperation with the partition plate (4) so that one of the first paper feeding wheel (5) and the second paper feeding wheel (6) performs the paper feeding work; the paper feeding mechanism is provided above the partition plate (4), and the first paper feeding wheel (5) and the second paper feeding wheel (6) are arranged and distributed along the paper feeding direction and are drivingly connected; the first paper feeding wheel (5) is rotatably connected to the body (1) through a transmission shaft (51) and is located above the partition plate (4), and the second paper feeding wheel (6) swings up and down relative to the paper cassette (2) corresponding to the paper outlet end position of the paper cassette (2); the first end of the partition plate (4) is rotatably connected to the body (1), the second end of the partition plate (4) extends to the paper inlet end of the paper cassette (2), the second end of the partition plate (4) is in linkage with the second paper feeding wheel (6) and swings up and down relative to the paper cassette (2), and a notch (41) for the second paper feeding wheel (6) to pass through and contact the paper inside the paper cassette (2) is provided at the second end of the partition plate (4).

2. The duplex printer according to claim 1, wherein: The first paper feeding wheel (5) and the second paper feeding wheel (6) are drivingly connected through a transmission mechanism (7); The transmission mechanism (7) includes a connecting arm (71) having an installation groove and a driving wheel (72), a driven wheel (73) and a first gear set (74) provided in the installation groove. The transmission shaft (51) penetrates through the first end of the connecting arm (71), the driving wheel (72) is provided on the transmission shaft (51), a wheel shaft (711) penetrates through the second end of the connecting arm (71), the second paper feeding wheel (6) and the driven wheel (73) are both provided on the wheel shaft (711), and the first gear set (74) meshes with the driving wheel (72) and the driven wheel (73) respectively.

3. The duplex printer according to claim 2, characterized in that: A linkage shaft (8) is connected to the second end of the connecting arm (71), and a limiting component (9) linked with the linkage shaft (8) is provided on the partition plate (4).

4. The duplex printer according to claim 3, characterized in that: The limiting component (9) includes a base body (91), and a through hole (911) for the linkage shaft (8) to penetrate into is provided on the base body (91).

5. The duplex printer according to claim 4, characterized in that: The limiting component (9) further includes a first elastic member (92) and a plate body (93), and the plate body (93) is connected to the inner top surface of the base body (91) through the first elastic member (92).

6. The duplex printer according to any one of claims 2 to 5, characterized in that: Two first paper feeding wheels (5) are provided and are located on both sides of the connecting arm (71); two second paper feeding wheels (6) are provided and are located on both sides of the connecting arm (71).

7. The duplex printer according to any one of claims 2 to 5, characterized in that: Corresponding to each gear in the first gear set (74), a connecting shaft is fixedly arranged in the mounting groove of the connecting arm (71), the gears in the first gear set (74) are sleeved on the corresponding connecting shafts, and limiting plates are arranged on both sides of the gears on the connecting shafts, and a second elastic member is arranged between the limiting plate of at least one connecting shaft and the side wall of the mounting groove.

8. The duplex printer according to any one of claims 1 to 5, characterized in that: A driving mechanism capable of driving the transmission shaft (51) to rotate is arranged on the machine body (1), and the driving mechanism includes a motor (100) and a second gear set (101) connected to the driving end of the motor (100), and the transmission shaft (51) is connected to the output gear of the second gear set (101).

9. The duplex printer according to any one of claims 1 to 5, characterized in that: The first paper feed roller (5) is located above the middle of the partition plate (4), and a rotatable friction wheel (42) is arranged on the upper surface of the partition plate (4) corresponding to the first paper feed roller (5).

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