Double-sided printing reversing structure of a printer

Abstract

The application discloses a double-sided printing reversing structure of a printer, which comprises a frame, a page turning mechanism arranged at the rear end of the frame, a page turning roller and a page turning channel surrounding the page turning roller arranged in the page turning mechanism, a paper guide plate connected with the outlet of the page turning channel, a printing platform arranged at the rear part of the frame, the rear part of the printing platform being arranged below the paper guide plate and forming a paper returning channel, the paper returning channel being communicated with the inlet of the page turning channel; a paper feeding motor, a first paper feeding shaft and a second paper feeding shaft arranged at the front and rear sides of the printing position are connected with the frame, the first paper feeding shaft and the second paper feeding shaft rotate synchronously and in the same direction, a rear support is connected with the middle part of the frame, the rear support is provided with a paper pressing roller corresponding to the second paper feeding shaft, the rear support is further provided with a paper pressing plate arranged above the front part of the printing platform, the rear end of the paper pressing plate is higher than the paper guide plate, a front support is connected with the front part of the frame, and the front support is provided with a paper guide gear corresponding to the first paper feeding shaft.

Description

Technical Field

[0001] The invention relates to the technical field of printers, in particular to a double-sided printing reversing structure of a printer. Background Art

[0002] Printers currently on the market stand out among numerous consumer electronics products. The reason for this is nothing more than their gradually decreasing prices and their high-quality printing results, which make the images of personal photos and color / black and white documents closer to life and vivid colors. In addition, through high-speed transmission interfaces (such as USB transmission interfaces), printers can achieve faster transmission speeds when printing large sizes and high resolutions. This means that users do not have to wait for the time consumed by data transmission, thereby enhancing printer efficiency.

[0003] Whether it's a laser printer, inkjet printer, fax machine, or other printing device, a paper feed system is essential. Existing desktop inkjet printers typically use a rear-feed mechanism, with paper inserted diagonally into the paper guide at the rear of the printer. For double-sided printing, the paper must be removed and then flipped back into the printer's paper guide. This is extremely inconvenient, inefficient, and time-consuming. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a double-sided printing reversing structure for a printer, which automatically reverses the direction of printing paper to perform double-sided printing.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A duplex printing reversing structure for a printer includes a frame, a page turner mechanism is provided at the rear end of the frame, a page turn roller and a page turn channel surrounding the page turn roller are provided in the page turner mechanism, the page turner mechanism is provided with a paper guide connected to the exit of the page turn channel, a printing platen is provided at the rear of the frame, the rear portion of the printing platen is located below the paper guide and forms a paper return channel, the paper return channel is connected to the entrance of the page turn channel; the frame is connected to a paper feed motor and a first paper feed shaft and a second paper feed shaft arranged on both sides of a printing position, the first paper feed shaft and the second paper feed shaft are transmission-connected to the paper feed motor and rotate synchronously and in the same direction, the middle portion of the frame is connected to a rear bracket, the rear bracket is provided with a paper pressing roller corresponding to the second paper feed shaft, the rear bracket is further provided with a paper pressing plate located above the front of the printing platen, the rear end of the paper pressing plate is higher than the paper guide, the front of the frame is connected to a front bracket, the front bracket is provided with a paper guide gear corresponding to the first paper feed shaft.

[0007] As an improvement of the above technical solution, the paper feed motor is arranged on the left side of the frame, the left ends of the first and second paper feed shafts are connected to synchronous pulleys and are connected to the paper feed motor through synchronous belts, and the synchronous pulley of the second paper feed shaft is connected to a grating distance measuring mechanism.

[0008] As a further improvement of the above technical solution, the right end of the second paper feed shaft is connected to a driving gear and is connected to the page turning roller through a one-way transmission mechanism.

[0009] Further improvement, the one-way transmission mechanism includes a fixed bracket connected to the frame and a first transmission gear, a second transmission gear, and a one-way gear connected to the fixed bracket, the driving gear is engaged with the first transmission gear, the second transmission gear is engaged with the one-way gear, and a freely rotatable swing bracket is connected to the rotating shaft of the first transmission gear, the swing bracket is in contact with the side of the first transmission gear, and two pinions engaged with the first transmission gear are connected to the swing bracket, the swing bracket is driven by the first transmission gear to swing so that one of the pinions is engaged with the second transmission gear or the other pinion is engaged with the one-way gear, and the one-way gear is connected to the page turning roller for transmission.

[0010] Further improvements are made in that the bottom surface of the frame is also connected to a paper bin for placing printing paper, and the bottom surface of the printing plate is connected to a paper loading mechanism, which includes a drive shaft, a bracket and a paper feed roller, the front end of the bracket is hinged to the drive shaft, and the paper feed roller is rotatably connected to the rear end of the bracket and is transmission-connected to the drive shaft; the paper loading mechanism is connected to a lifting mechanism, which includes a rotating shaft and a support plate rotatably connected to the rotating shaft, and a torsion spring is mounted on the rotating shaft. Under the action of the torsion spring, the support plate tilts up and supports the bracket, and the side wall of the paper bin is provided with a stop block. When the paper bin is installed in place, the stop block pushes the torsion spring to deform and cause the bracket to fall, and the paper feed roller contacts the printing paper in the paper bin to push the printing paper toward the page turning channel.

[0011] As a further improvement, the page turner mechanism is connected to an upper paper stopper arranged behind the paper bin, and the upper paper stopper is provided with a paper guide rib connecting the paper bin and the page turning channel.

[0012] Further improvement, four single-row and sequentially meshed transmission gears are installed in the bracket, and the two ends of the four transmission gears are respectively meshed with the driving shaft and the paper feed wheel for transmission, and the left end of the driving shaft is connected with a switching device, and the switching device includes a mounting bracket and a switching gear, and the mounting bracket is provided with a switching shaft, and the switching gear is slidably connected to the switching shaft and can move freely along the switching shaft, and the switching shaft is also slidably connected with a switching push plate, and the switching push plate is provided with a paper feed switching slider pushed by the carriage, a first spring is provided between the left side of the switching gear and the mounting bracket, and a second spring is provided between the left side of the switching gear and the switching push plate; the mounting bracket is also connected to a first gear, and the switching gear can mesh with the first gear, and the switching gear is kept away from the first gear under the action of the first spring and the second spring, and the first gear is transmission-connected to the driving shaft.

[0013] As a further improvement, two friction rollers are provided in the page-turning mechanism, and the two friction rollers are located on both sides of the page-turning roller. Two elastic steel wires are also provided in the page-turning mechanism, and each elastic steel wire passes through the rotating shaft of one of the friction rollers to make the friction roller fit the page-turning roller.

[0014] The present invention has the following beneficial effects: when performing duplex printing, the printing paper enters the page turning channel of the page turning mechanism, is driven by the page turning roller to move the printing paper out of the paper guide and into the channel between the printing platen and the paper pressing platen. The paper feed motor 3 rotates forward, and the paper pressing roller and the second paper feed shaft cooperate to transport the printing paper forward for printing. The paper guide gear located in front of the printing position and the first paper feed shaft cooperate to drive the printing paper forward to complete the printing of the first side. Then, the paper feed motor reverses, and the first and second paper feed shafts rotate synchronously and in opposite directions, driving the printing paper backward, passing through the paper return channel and the page turning channel in sequence. Driven by the page turning roller, the printing paper is turned over and output again to the channel between the printing platen and the paper pressing platen. At this time, the paper feed motor rotates forward, and the first and second paper feed shafts rotate synchronously and forward, driving the printing paper forward again to complete the printing of the second side. The entire duplex printing process is automated, precise, reliable, efficient, and saves printing time. In particular, it meets the requirements of continuous high-speed automatic printing, is convenient and easy to use, and brings convenience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and examples.

[0016] Figure 1 、 Figure 2 It is a structural schematic diagram of the present invention;

[0017] Figure 3 is a cross-sectional view of the present invention;

[0018] Figure 4 、 Figure 5 It is a structural schematic diagram of the one-way transmission mechanism of the present invention;

[0019] Figure 6 、 Figure 7 This is a schematic diagram of the connection between the paper bin, paper loading mechanism and page turning mechanism in the present invention;

[0020] Figure 8 It is a structural schematic diagram of the paper loading mechanism in the present invention;

[0021] Figure 9 、 Figure 10 These are diagrams showing two usage states of the paper loading mechanism of the present invention. DETAILED DESCRIPTION

[0022] Reference Figures 1 to 10A double-sided printing reversing structure of a printer includes a frame 1, a page turner mechanism 2 is provided at the rear end of the frame 1, a page turner roller 201 and a page turn channel surrounding the page turner roller 201 are provided in the page turner mechanism 2, the page turner mechanism 2 is provided with a paper guide 202 connected to the exit of the page turn channel, a printing platen 101 is provided at the rear of the frame 1, the rear portion of the printing platen 101 is located below the paper guide 202 and forms a paper return channel, and the paper return channel is connected to the entrance of the page turn channel; It is connected to a paper feed motor 3 and a first paper feed shaft 4 and a second paper feed shaft 5 arranged on the front and rear sides of the printing position. The middle part of the frame 1 is connected to a rear bracket 6, and the rear bracket 6 is provided with a paper pressing roller 601 corresponding to the second paper feed shaft 5. The rear bracket 6 is also provided with a paper pressing plate 602 located above the front of the printing platen 101. The rear end of the paper pressing plate 602 is higher than the paper guide 202. The front part of the frame 1 is connected to a front bracket 7, and the front bracket 7 is provided with a paper guide gear 701 corresponding to the first paper feed shaft 4. In this embodiment, preferably, the paper feed motor 3 is arranged on the left side of the frame 1, and the left ends of the first paper feed shaft 4 and the second paper feed shaft 5 are connected to a synchronous pulley and are connected to the paper feed motor 3 through a synchronous belt to achieve synchronous and same-direction rotation. The synchronous pulley of the second paper feed shaft 5 is connected to a grating distance measuring mechanism 13. With the above structure, the paper feeding process for the first side of normal single-sided printing and double-sided printing is the same. The printing paper enters the page turning channel of the page turning mechanism 2, and is driven by the page turning roller 201 to move the printing paper and output from the paper guide 202. The rear end of the paper pressing plate 602 is tilted and higher than the paper guide 202, and the printing paper enters the channel between the printing platen 101 and the paper pressing plate 602. Then, it is transported forward by the paper pressing roller 601 and the second paper feed shaft 5 to perform the printing operation. The carriage is arranged between the second paper feed shaft 5 and the first paper feed shaft 4 for printing. The paper guide gear 701 and the first paper feed shaft 4 cooperate to drive the printing paper forward to complete the printing of the first side of single-sided printing or double-sided printing; the paper feeding process for the second side of double-sided printing is as follows: the paper feed motor 3 reverses The first paper feed shaft 4 and the second paper feed shaft 5 rotate synchronously and in opposite directions, driving the printing paper to move backward. Since the paper guide 202 is higher than the printing platen 101, a paper return channel is formed. The printing paper passes through the paper return channel and the page turning channel in sequence. Driven by the page turning roller 201, the printing paper completes the page turning and is output to the channel between the printing platen 101 and the paper pressing plate 602 again. At this time, the printing paper has completed the page turning, and the second side of the printing paper faces up. The paper feed motor 3 rotates forward, and the first paper feed shaft 4 and the second paper feed shaft 5 rotate synchronously and forward, driving the printing paper to move forward again to complete the printing operation of the second side. The double-sided printing process is automated, precise and reliable, efficient, and saves printing time. In particular, it meets the needs of continuous high-speed automatic printing, is convenient and easy to use, and brings convenience to users.

[0023] In this embodiment, preferably, the right end of the second paper feed shaft 5 is connected to a driving gear 501 and is connected to the page turning roller 201 through a one-way transmission mechanism 8 . Preferably, the one-way transmission mechanism 8 includes a fixed bracket 801 connected to the frame 1 and a first transmission gear 802, a second transmission gear 803, and a one-way gear 804 connected to the fixed bracket 801, the driving gear 501 is engaged with the first transmission gear 802, the second transmission gear 803 is engaged with the one-way gear 804, and a freely rotatable swing bracket 805 is connected to the rotating shaft of the first transmission gear 802, the swing bracket 805 is in contact with the side of the first transmission gear 802, and two small gears 806 engaged with the first transmission gear 802 are connected to the swing bracket 805, and the swing bracket 805 is driven by the first transmission gear 802 to swing so that one of the small gears 806 is engaged with the second transmission gear 803 or the other small gear 806 is engaged with the one-way gear 804, and the one-way gear 804 is transmission-connected to the page-turning roller 201. When the driving gear 501 rotates clockwise, the first transmission gear 802 drives the swing bracket 805 to rotate counterclockwise through friction, and the small gear 806 on the lower side engages with the one-way gear 804, thereby driving the one-way gear 804 to rotate counterclockwise; when the driving gear 501 rotates counterclockwise, the first transmission gear 802 drives the swing bracket 805 to rotate clockwise through friction, and the small gear 806 on the upper side engages with the second transmission gear 803, and the second transmission gear 803 drives the one-way gear 804 to rotate counterclockwise; that is, no matter whether the driving gear 501 rotates clockwise or counterclockwise, the one-way gear 804 maintains one-way rotation counterclockwise. When applied to double-sided printing, no matter whether paper is fed or ejected, the one-way gear 804 drives the page turning roller 201 to rotate in one direction. The page turning roller 201 does not need to be provided with an independent power source, and the control is simplified.

[0024] In this embodiment, preferably, the bottom surface of the frame 1 is further connected to a paper bin 9 for placing printing paper, and the bottom surface of the printing platen 101 is connected to a paper loading mechanism 11, and the paper loading mechanism 11 includes a driving shaft 111, a bracket 112 and a paper feed wheel 113. The front end of the bracket 112 is hinged to the driving shaft 111, and the paper feed wheel 113 is rotatably connected to the rear end of the bracket 112 and is transmission-connected to the driving shaft 111; the paper loading mechanism 11 is connected to a lifting mechanism, so The lifting mechanism includes a rotating shaft 114 and a support plate 115 rotatably connected to the rotating shaft 114. The rotating shaft 114 is provided with a torsion spring 116. Under the action of the torsion spring 116, the support plate 115 is tilted to support the bracket 112. The side wall of the paper bin 9 is provided with a block. When the paper bin 9 is installed in place, the block pushes the torsion spring 116 to deform and cause the bracket 112 to fall. The paper feed roller 113 contacts the printing paper in the paper bin 9 to push the printing paper toward the page turning channel. When the paper tray 9 is pulled out (not loaded), the torsion spring 116 pushes the support plate 115 to tilt and lift the bracket 112, that is, the paper loading mechanism 11 is lifted, which will not hinder the loading and pulling out of the paper tray 9; the printing paper is loaded in the paper tray 9 and then loaded into the inkjet printer. The block on the side wall of the paper tray 9 pushes the torsion spring 116 to deform and cause the bracket 112 to fall, and the paper feed roller 113 contacts the printing paper in the paper tray 1. The drive shaft 111 is driven by the paper feed motor 3 and drives the paper feed roller 113 to rotate. The paper feed roller 113 drives the printing paper to move to the page turning channel of the page turner mechanism 2, and then the page turning roller 201 drives the printing paper to turn and turn the page along the page turning channel to complete the paper feeding step. The printing paper is stacked in the paper tray 9, which avoids the printing paper from being scattered, which is conducive to improving the printing quality. At the same time, the printing paper is in the paper tray 9 and stored in the inkjet printer to avoid being contaminated by dust and debris, and the cleanliness is guaranteed. Even if it is not used for a long time, it can be printed at any time.

[0025] In this embodiment, preferably, the page turner mechanism 2 is connected to an upper paper stopper 203 arranged behind the paper bin 9, and the upper paper stopper 203 is provided with a paper guide rib connecting the paper bin 9 and the page turning channel, and the paper guide rib pushes the printing paper to turn and enter the page turning channel.

[0026] In this embodiment, preferably, four single-row and sequentially meshed transmission gears are installed in the bracket 112, and the two ends of the four transmission gears are respectively meshed with the drive shaft 111 and the paper feed wheel 113 for transmission. The left end of the drive shaft 111 is connected to a switching device, and the switching device includes a mounting bracket 121 and a switching gear 122. The mounting bracket 121 is provided with a switching shaft 123. The switching gear 122 is slidably connected to the switching shaft 123 and can move freely along the switching shaft 123. The switching shaft 123 is also slidably connected to a switching push plate 124. The switching push plate 124 is provided with a paper feed switching slider pushed by the carriage, a first spring 125 is provided between the left side of the switching gear 122 and the mounting bracket 121, and a second spring 126 is provided between the left side of the switching gear 122 and the switching push plate 124; the mounting bracket 121 is also connected to a first gear 127, and the switching gear 122 can mesh with the first gear 127. The switching gear 122 is kept away from the first gear 127 by the action of the first spring 125 and the second spring 126, and the first gear 127 is connected to the driving shaft 111. With the above structure, when the paper is not being fed, that is, when the inkjet printer is in the off, printing or ink guiding state, the switching device is in the initial state, which is as shown in FIG. Figure 8 As shown, the switching gear 122 is in a balanced position under the action of the first spring 125 and the second spring 126. At this time, the switching gear 122 is not engaged with the first gear 127. Therefore, the paper feeding mechanism 11 does not work in this state. Paper feeding process: When the carriage moves to the left end and pushes the paper feed switching slider to move to the left, there are two possibilities. Figure 9 and Figure 10 As shown, the first method involves the paper feed switching slider pushing the switching gear 122 leftward via the switching push plate 124 and the second spring 126. When the switching gear 122 engages the first gear 127, the paper feeding state is reached, and the paper feeding mechanism 11 is driven by the paper feed motor 3 to achieve paper feeding. The second method involves the switching gear 122 colliding with the first gear 127. At this point, the elastic force of the second spring 126 is greater than that of the first spring 125. When the paper feed motor 3 drives the switching gear 122 to rotate, the elastic force of the second spring 126 causes the switching gear 122 to engage with the first gear 127, thus achieving paper feeding. When paper feeding is complete, the carriage moves right, and the switching push plate 124, driven right by the second spring 126, returns the paper feed switching mechanism to its initial state. Using the carriage to switch the paper feed state ensures the linkage between printing and paper feeding, resulting in a compact and simple structure that helps reduce the manufacturing and maintenance costs of the printer.

[0027] In this embodiment, preferably, two friction rollers 204 are further provided in the page turner mechanism 2, and the two friction rollers 204 are located on both sides of the page turner roller 201. Two elastic steel wires 205 are also provided in the page turner mechanism 2, and each elastic steel wire 205 passes through the rotating shaft of one of the friction rollers 204 to make the friction roller 204 fit the page turner roller 201. The friction roller 204 and the page turner roller 201 cooperate to ensure that the printing paper moves smoothly in the page turner mechanism 2, and prevent the printing paper from wrinkling or folding.

[0028] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments. As long as the technical effects of the present invention are achieved by any same or similar means, they should fall within the scope of protection of the present invention.

Claims

1. A double-sided printing reversing structure for a printer, comprising a frame (1), characterized in that: The rear end of the frame (1) is provided with a page turning mechanism (2), a page turning roller (201) and a page turning channel surrounding the page turning roller (201) are provided in the page turning mechanism (2), and a paper guide (202) connected to the exit of the page turning channel is provided in the page turning mechanism (2). The rear part of the frame (1) is provided with a printing platen (101), and the rear part of the printing platen (101) is located below the paper guide (202) and forms a paper return channel, and the paper return channel is connected to the entrance of the page turning channel; the frame (1) is connected with a paper feed motor (3) and a first paper feed shaft (4) and a second paper feed shaft arranged on both sides of the printing position. (5), the first paper feed shaft (4) and the second paper feed shaft (5) are connected to the paper feed motor (3) and rotate synchronously and in the same direction, the middle of the frame (1) is connected to a rear bracket (6), the rear bracket (6) is provided with a paper pressing roller (601) corresponding to the second paper feed shaft (5), the rear bracket (6) is further provided with a paper pressing plate (602) located above the front of the printing platen (101), the rear end of the paper pressing plate (602) is higher than the paper guide (202), the front of the frame (1) is connected to a front bracket (7), the front bracket (7) is provided with a paper guide gear (701) corresponding to the first paper feed shaft (4); The bottom surface of the frame (1) is also connected to a paper bin (9) for placing printing paper, and the bottom surface of the printing platen (101) is connected to a paper loading mechanism (11), the paper loading mechanism (11) includes a driving shaft (111), a bracket (112) and a paper feed wheel (113), the front end of the bracket (112) is hinged to the driving shaft (111), the paper feed wheel (113) is rotatably connected to the rear end of the bracket (112) and is transmission-connected to the driving shaft (111); the paper loading mechanism (11) is connected to a lifting mechanism, and the lifting mechanism includes a plurality of supporting members. The invention comprises a rotating shaft (114) and a supporting plate (115) rotatably connected to the rotating shaft (114), wherein a torsion spring (116) is mounted on the rotating shaft (114), and under the action of the torsion spring (116), the supporting plate (115) is tilted to support the bracket (112), and a stopper is provided on the side wall of the paper bin (9). When the paper bin (9) is installed in place, the stopper pushes the torsion spring (116) to deform and causes the bracket (112) to fall, and the paper feed wheel (113) contacts the printing paper in the paper bin (9) to push the printing paper toward the page turning channel; The page turning mechanism (2) is connected to an upper paper stopper (203) arranged behind the paper bin (9), and the upper paper stopper (203) is provided with a paper guide rib connecting the paper bin (9) and the page turning channel; Four transmission gears are installed in a single row and meshed in sequence in the bracket (112). The two ends of the four transmission gears are respectively meshed with the driving shaft (111) and the paper feed wheel (113) to transmit the power. The left end of the driving shaft (111) is connected to a switching device. The switching device includes a mounting bracket (121) and a switching gear (122). The mounting bracket (121) is provided with a switching shaft (123). The switching gear (122) is slidably connected to the switching shaft (123) and can move freely along the switching shaft (123). The switching shaft (123) is also slidably connected to a switching push plate (124). The switching push plate (124) is provided with a A paper feed switching slider is provided which is pushed by a carriage, a first spring (125) is provided between the left side of the switching gear (122) and the mounting bracket (121), and a second spring (126) is provided between the left side of the switching gear (122) and the switching push plate (124); a first gear (127) is further connected to the mounting bracket (121), the switching gear (122) can mesh with the first gear (127), and the switching gear (122) is kept away from the first gear (127) under the action of the first spring (125) and the second spring (126), and the first gear (127) is in transmission connection with the drive shaft (111); Two friction rollers (204) are further provided in the page-turning mechanism (2), and the two friction rollers (204) are respectively arranged on both sides of the page-turning roller (201). Two elastic steel wires (205) are further provided in the page-turning mechanism (2), and each elastic steel wire (205) passes through the rotating shaft of one of the friction rollers (204) so ​​that the friction roller (204) is attached to the page-turning roller (201).

2. The double-sided printing reversing structure of a printer according to claim 1, characterized in that: The paper feed motor (3) is arranged on the left side of the frame (1); the left ends of the first paper feed shaft (4) and the second paper feed shaft (5) are connected to synchronous pulleys and are connected to the paper feed motor (3) through synchronous belts; the synchronous pulley of the second paper feed shaft (5) is connected to a grating distance measuring mechanism (13).

3. The double-sided printing reversing structure of a printer according to claim 1 or 2, characterized in that: The right end of the second paper feed shaft (5) is connected to a driving gear (501) and is connected to the page turning roller (201) via a one-way transmission mechanism (8).

4. The double-sided printing reversing structure of a printer according to claim 3, characterized in that: The one-way transmission mechanism (8) includes a fixed bracket (801) connected to the frame (1) and a first transmission gear (802), a second transmission gear (803), and a one-way gear (804) connected to the fixed bracket (801); the driving gear (501) is meshed with the first transmission gear (802); the second transmission gear (803) is meshed with the one-way gear (804); a freely rotatable swing bracket (805) is connected to the rotating shaft of the first transmission gear (802); the swing bracket ( 805) contacts the side of the first transmission gear (802), and two small gears (806) meshing with the first transmission gear (802) are connected to the swing bracket (805). The swing bracket (805) is driven by the first transmission gear (802) to swing so that one of the small gears (806) meshes with the second transmission gear (803) or the other small gear (806) meshes with the one-way gear (804), and the one-way gear (804) is in transmission connection with the page turning roller (201).

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