Double-sided printing conveying device and double-sided printer

Abstract

The invention discloses a double-sided printing conveying device and a double-sided printer, and belongs to the technical field of printers. The double-sided printing conveying device comprises a guide piece used for guiding paper to advance along a preset path, a paper feeding mechanism used for conveying the paper in the conveying direction, and a correction adjusting mechanism used for adjusting the contact position of a driven roller and a driving roller so as to guide the paper of different sizes to advance and correcting the inclined posture of the paper in the conveying process. According to the double-sided printing conveying device, the contact position of the driven roller and the driving roller can be adjusted at will through the correcting and adjusting mechanism so that paper of different sizes can be guided to advance, the inclined state of the paper of any size in the conveying process can be corrected, and therefore double-sided printing of the paper of any size is achieved; and the application scene of the double-sided printer is greatly widened.

Description

Technical Field

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

[0002] Duplex printers are indispensable devices in modern office environments. Duplex printing can significantly reduce paper consumption, lower printing costs, and is also beneficial to environmental protection. However, existing duplex printers can only print papers of set sizes and cannot match with a paper conveying unit to print papers of any size, which greatly limits the application of duplex printers. For example, Chinese Patent CN105565020A discloses an image forming device and its duplex printing paper conveying unit, which can print two different sizes of papers. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a duplex printing conveying device and a duplex printer.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A duplex printing conveying device includes:

[0006] A guiding member for guiding the paper to advance along a predetermined path;

[0007] A paper feeding mechanism for feeding the paper along the conveying direction, including a driving roller and a driven roller rotatably mounted on the guiding member perpendicular to the paper conveying direction. The length of the driving roller matches the maximum size of the paper. The driving roller is connected to an end gear through a shaft to receive power provided by a power source in the printer. The driven roller is movably arranged above the driving roller through a driven roller bracket, and the driven roller cooperates with the driving roller to guide the paper to advance; and

[0008] A correction and adjustment mechanism mounted on the guiding member for adjusting the contact position between the driven roller and the driving roller to guide papers of different sizes to advance, and correcting the inclined posture of the paper during the conveying process.

[0009] Further, the correction and adjustment mechanism includes a first rack, a central gear, a second rack, a first slider, a second slider, and a locking assembly; the central gear is rotatably mounted at the central part of the guiding member. The first rack and the second rack are slidably mounted on the guiding member perpendicular to the paper advancing direction and are respectively meshed and connected to both sides of the central gear. One end of the first rack is fixedly connected to the driven roller bracket through the first slider, one end of the second rack is fixedly connected to the second slider, and guiding grooves for correcting the paper advancing direction are respectively provided on the opposite sides of the first slider and the second slider; the locking assembly is mounted in the through hole of the second slider for pushing and pulling the second slider to drive the second rack to move or locking the second slider fixedly on the guiding member.

[0010] Through the cooperation of the first rack, the second rack and the central gear, the contact position between the driven roller and the driving roller can be adjusted arbitrarily to adjust the size of the conveyed paper, and the adjusted rack can be locked and fixed at the corresponding position through the locking assembly, so as to ensure the stable and smooth conveyance of the paper.

[0011] Furthermore, the locking assembly includes a movable block, a locking spring and a locking block. The movable block is rotatably installed in the through hole of the second slider, with a handle for pressing at its top and a U-shaped groove with a downward opening at its lower end; the locking block is movably installed in the U-shaped groove of the movable block, its top is connected to the inner wall of the U-shaped groove through a locking spring, and its bottom is provided with a protruding tooth, which is engaged with a row of tooth grooves opened on the guide member.

[0012] The structure of the locking assembly is simple and easy to implement, and through the cooperation of the protruding tooth and the tooth groove, the adjusted rack can be locked and fixed at any position of the guide member.

[0013] Furthermore, V-shaped through holes are provided on both sides of the U-shaped groove of the movable block, and ear pieces are provided on both sides of the upper end of the locking block, and the ear pieces are slidably and rotatably connected to the V-shaped through holes.

[0014] The setting of the V-shaped through holes adapts to the movement of the locking block.

[0015] Furthermore, the guide groove includes a guiding surface for guiding the paper and a correcting surface for correcting the side edge of the paper. The guiding surfaces of the two guide grooves are both parallel to the upper surface of the guide member and are located in the same horizontal plane; the correcting surface is perpendicular to the guiding surface.

[0016] The guide groove has a simple structure and can effectively correct the inclined posture of the paper during conveyance.

[0017] Furthermore, the first slider and the second slider are respectively slidably connected to the first guide rail and the second guide rail, and the first guide rail and the second guide rail are respectively fixedly installed on the outside of the first rack and the second rack.

[0018] Ensure the moving stability of the first rack and the second rack, and further ensure the effective contact between the driven roller and the driving roller, ensure the stable and smooth conveyance of the paper, and effectively correct the inclined posture of the paper during conveyance.

[0019] Furthermore, the guide member is composed of a flat plate, and a plurality of longitudinal guide ribs extending along the paper advancing direction are provided on the upper surface of the flat plate. It is convenient to insert or withdraw the duplex printing conveyance device into or out of the printer during use, and the setting of the longitudinal guide ribs can reduce the friction of paper conveyance.

[0020] Furthermore, a groove for installing the correction adjustment mechanism is transversely opened in the middle part of the guide member. Prevent the correction adjustment mechanism from interfering with paper conveyance.

[0021] Furthermore, the paper feeding mechanism further includes a driving pulley, a toothed belt, a driven pulley, and a paper feeding roller. The driving roller is installed at the rear side of the guiding member, i.e., the paper feeding side, and one end thereof is coaxially and fixedly connected to the driving pulley and the end gear. The paper feeding roller is rotatably and horizontally installed at the middle part of the front side of the guiding member through a paper feeding roller shaft, and one end thereof is coaxially and fixedly connected to the driven pulley. The driven pulley (628) is connected to the driving pulley through a toothed belt.

[0022] The arrangement of the paper feeding roller can further ensure the stable and smooth conveyance of the paper.

[0023] A duplex printer includes a housing and a paper feeding unit, a printing unit, a fixing unit, a paper discharging unit, a picking device, and any one of the above duplex printing conveyance devices disposed inside the housing; the paper feeding unit is used to provide printing paper, the picking device is used to pick up the paper stacked on the paper feeding unit, turn it over, and deliver it to the printing station; the printing unit is used to form a toner image on the paper, the fixing unit is used to fix the toner image on the paper, the paper discharging unit is used to turn over and discharge the paper after printing and fixing, and the duplex printing conveyance device is used to convey the paper reaching the paper discharging unit in the opposite direction to the printing unit again for reverse printing and imaging.

[0024] Advantages of the present invention:

[0025] 1. The duplex printer of the present invention can arbitrarily adjust the size of the conveyed paper through the duplex printing conveyance device to match the paper conveyance unit, thereby realizing duplex printing of papers of any size.

[0026] 2. The duplex printing conveyance device of the present invention can arbitrarily adjust the contact position between the driven roller and the driving roller through the correction adjustment mechanism to guide the papers of different sizes to advance, and can correct the inclination state of the papers of any size during the conveyance process, thereby realizing duplex printing of papers of any size, and greatly broadening the application scenarios of the duplex printer. Description of the Drawings

[0027] Figure 1 is an external view of the duplex printer of the present application.

[0028] Figure 2 is a structural schematic diagram of the duplex printer of the present application.

[0029] Figure 3 is a front view of the duplex printing conveyance device of the present application.

[0030] Figure 4 is Figure 3 a top view of

[0031] Figure 5 is a structural schematic diagram of the duplex printing conveyance device of the present application in the installed state.

[0032] Figure 6 This is a schematic structural diagram of the locking component of the present application. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred implementation manners.

[0034] Refer to Figure 1 - Figure 2 , the present application provides a duplex printer, which includes a housing and a paper feeding unit 10, a printing unit 20, a fixing unit 30, a paper discharging unit 40, a picking device 50 and a duplex printing conveying device 60 arranged inside the housing.

[0035] A paper feeding port 101 and a paper discharging port 102 are provided on the front side of the housing, and an opening 103 is provided on the rear side. The paper feeding unit 10, the printing unit 20, the fixing unit 30, the paper discharging unit 40, and the picking device 50 are all prior arts.

[0036] The paper feeding unit 10 includes a paper tray, and the paper tray is arranged at the bottom of the housing, and its outlet is connected to the paper feeding port 101.

[0037] The picking device 50 is arranged above the paper tray and near the rear side of the printer. The picking device 50 includes a picking roller 51 and a first conveying roller 52 arranged in sequence along the paper conveying path. The picking roller 51 is used to pick up the papers stacked in the paper tray, turn them over, and send them to the printing station through the first conveying roller 52.

[0038] The paper discharging unit 40 is arranged on the top of the printer, and includes a second conveying roller 41, a third conveying roller 42 and a paper discharging tray 43 arranged in sequence along the paper conveying path. The paper discharging tray 43 is connected to the paper discharging port 102. The second conveying roller 41 is used to turn over the papers that have been printed and fixed, discharge them to the paper discharging tray 43 through the third conveying roller 42, and stack them on the paper discharging tray 43.

[0039] The printing unit 20 and the fixing unit 30 are arranged in the middle part of the printer. The printing unit 20 is located at the rear side of the printer and is used to form a toner image on the paper; the fixing unit 30 is arranged in front of the printing unit 20 and is used to fix the toner image on the paper onto the paper.

[0040] The duplex printing conveying device 60 is arranged between the paper feeding unit 10 and the paper feeding unit 10, and its paper discharging end is located below the picking device 50. During specific implementation, as Figure 1As shown in the figure, an opening 103 for inserting or withdrawing the duplex printing paper conveying device 60 is provided on the rear side wall of the housing. A guide rail (not shown in the figure) for guiding and supporting the duplex printing paper conveying device 60 is provided inside the opening 103. When the duplex printing paper conveying device 60 is installed at a predetermined position, it is located vertically between the paper cassette and the paper feeding unit 10, and the paper discharging end thereof is located below the picking device 50.

[0041] When the present application works:

[0042] In the case of single-sided printing, the paper in the paper cassette is picked up by the paper picking device 50, enters the printing unit 20 for single-sided printing to form a toner image, then enters the fixing unit 30 to fix the toner image on the paper, and finally reaches the paper discharging unit 40 and is discharged through the paper discharging port 102.

[0043] In the case of duplex printing, the paper reaching the paper discharging unit 40 is conveyed again by the duplex printing conveying device 60 in the opposite direction to the printing unit 20 for reverse-side printing and imaging of the paper, and then enters the fixing unit 30 and the paper discharging unit 40 in sequence and is discharged through the paper discharging port 102.

[0044] Referring to Figure 3 - Figure 4 , the duplex printing conveying device 60 includes a guide member 61, a paper feeding mechanism 62 and a correction and adjustment mechanism 63; the guide member 61 is used for guiding the paper to advance along a predetermined path. The guide member 61 is composed of a flat plate. A plurality of longitudinal guide ribs 611 extending along the paper advancing direction are provided on the upper surface of the flat plate. The paper travels along the upper surface of the longitudinal guide ribs 611 to reduce the friction force. A groove 612 for installing the correction and adjustment mechanism 63 is transversely opened in the middle part of the flat plate. A first guide rail 613 and a second guide rail 614 are provided in parallel in the groove 612. A row of tooth grooves 615 is provided inside the second guide rail 614, and the length direction of the tooth grooves extends along the direction perpendicular to the guide rail.

[0045] The calibration adjustment mechanism 63 includes a first rack 631, a central gear 632, a second rack 633, a first guide rail 613, a second guide rail 614, a first slider 634, a second slider 635, and a locking assembly 636. The central gear 632 is rotatably installed in the middle of the groove 612. The first rack 631 and the second rack 633 are respectively installed on both sides of the central gear 632 and are meshed and connected to both sides of the central gear 632. The first slider 634 and the second slider 635 are respectively slidably connected to the first guide rail 613 and the second guide rail 614. One end of the first rack 631 is fixed on the first slider 634, and the other end extends along a direction parallel to the first guide rail 613; one end of the second rack 633 is fixed on the second slider 635, and the other end extends along a direction parallel to the second guide rail 614; the first slider 634 and the second slider 635 are respectively located on both sides of the central gear 632, and the opposite side surfaces of the first slider 634 and the second slider 635 are respectively provided with a first guide groove 6341 and a second guide groove 6342 for calibrating the forward direction of the paper. The first guide groove 6341 and the second guide groove 6342 have the same structure, and both include a guiding surface for guiding the paper and a correcting surface for correcting the side edge of the paper. The two guiding surfaces are parallel to the upper surface of the guiding member 61 and are located in the same horizontal plane; the correcting surface is perpendicular to the guiding surface. The second slider 635 is provided with a through groove penetrating its upper and lower surfaces.

[0046] Refer to Figure 6 , the locking assembly 636 includes a movable block 6361, a locking spring 6362, and a locking block 6363. The upper end of the movable block 6361 is provided with a handle 63611 for pressing. The lower end of the movable block 6361 is provided with a U-shaped groove with an opening facing down for installing the locking spring 6362 and the locking block 6363. Both sides of the movable block 6361 are provided with an ear 63612 for rotatably connecting the second slider 635 and a V-shaped through hole 63613 for slidably connecting the locking block 6363. The upper end of the locking spring 6362 is fixed on the inner bottom surface of the U-shaped groove, and the lower end is fixedly connected to the locking block 6363. Both sides of the locking block 6363 are provided with ears 63631 slidably matched with the V-shaped through hole 63613, and the bottom is provided with a protruding tooth 63632.

[0047] The movable block 6361 is rotatably installed in the through groove of the second slider 635 through its ear 63612, and an opening for pressing the handle 63611 is provided on one side surface of the through groove; the locking block 6363 is slidably installed in the U-shaped groove of the movable block 6361 through its ear 63631, and the lower end of the locking block 6363 passes through the U-shaped groove and is engaged with the tooth groove 615 through its protruding tooth 63632.

[0048] Press the handle 63611 to rotate the movable block 6361 around its lug 63612. The locking spring 6362 pulls the locking block 6363 to slide upward, and the protruding tooth 63632 disengages from the tooth groove 615. The second slider 635 can slide freely on the second guide rail 614. Release the handle 63611, and the locking block 6363 slides downward under the spring force of the locking spring 6362. The protruding tooth 63632 engages with the tooth groove 615, and the second slider 635 is locked on the guide 61.

[0049] The paper feeding mechanism 62 includes a driving roller 621, a driven roller 622, a driven roller bracket 623, a driving pulley 624, an end gear 625, a toothed belt 627, a driven pulley 628, and a paper feed roller 629. The driving roller 621 is rotatably and horizontally installed at the rear side of the guide 61 through a driving roller shaft, and the length of the driving roller 621 matches the maximum size of the paper. One end of the driving roller 621 is coaxially and fixedly connected to the driving pulley 624 and the end gear 625. The driving roller 621 is connected to the end gear 625 through a shaft to receive power provided by a power source (not shown in the figure) in the duplex printer. The paper feed roller 629 is rotatably and horizontally installed in the middle of the front side of the guide 61 through a paper feed roller shaft, and one end of it is coaxially and fixedly connected to the driven pulley 628. The driven pulley 628 is connected to the driving pulley 624 through the toothed belt 627. The driving roller 621 is driven to rotate by the end gear 625, and drives the paper feed roller 629 to rotate synchronously through the toothed belt 627.

[0050] One end of the driven roller bracket 623 is fixed on the first slider 634, and the other end extends above the driving roller 621. An opening groove is provided at the extended end. The driven roller 622 is rotatably installed in the opening groove of the driven roller bracket 623 through a driven roller shaft. When the driven roller bracket 623 slides along the first guide rail 613, the driven roller 622 is always located above the driving roller 621 and is frictionally rotatably connected to the driving roller 621 to provide a constant contact pressure, thereby ensuring a constant conveying force for the paper.

[0051] By adjusting the contact position between the driven roller 622 and the driving roller 621, different sizes of paper can be guided to move forward, thereby realizing duplex printing of any size of paper.

[0052] The working principle of the duplex printing conveying device 60 is as follows:

[0053] Refer to Figure 5 , in the initial state, the first slider 634 and the second slider 635 are respectively located on the left and right sides of the guide 61. The second slider 635 is locked on the guide 61, and the driven roller 622 is located at one end of the driving roller 621. At this time, the distance between the two calibration surfaces of the first guide groove 6341 and the second guide groove 6342 is the largest, and the size of the paper that can be printed is the largest;

[0054] When it is necessary to adjust the size of the printing paper, pull out the duplex printing conveying device 60, press the handle 63611 to disengage the locking block 6363 from the tooth groove 615, manually push the second slider 635 towards the center gear 632, the second rack 633 drives the center gear 632 to rotate clockwise, the center gear 632 drives the first rack 631 and the first slider 634 to move relative to the second rack 633, the distance between the two calibration surfaces of the first guide groove 6341 and the second guide groove 6342 is reduced, the driven roller 622 moves towards the middle of the driving roller 621, and the size of the printable paper is reduced; when the appropriate distance is adjusted, release the handle 63611 to make the bottom protrusion 63632 of the locking block 6363 engage with the tooth groove 615, lock the positions of the first slider 634 and the second slider 635, and insert the duplex printing conveying device 60 into the printer housing.

[0055] Through the cooperation of the rack and the gear and the cooperation of the locking block and the tooth groove 615, the size of the printing paper can be adjusted arbitrarily, which greatly broadens the application scenarios of the duplex printer.

[0056] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also within the protection scope of the present invention.

Claims

1. A double-sided printing and conveying device, characterized in that: include: A guide member (61) for guiding the paper to move along a predetermined path; A paper feeding mechanism (62) is used to feed paper in a feeding direction, comprising an active roller (621) and a passive roller (622) rotatably mounted on a guide member (61) in a direction perpendicular to the paper feeding direction, wherein the length of the active roller (621) matches the maximum size of the paper, the active roller (621) is connected to an end gear (625) via a shaft to receive power provided by a power source in the printer, the passive roller (622) is movably arranged above the active roller (621) via a passive roller bracket (623), and the passive roller (622) cooperates with the active roller (621) to guide the paper forward; and The correction adjustment mechanism (63) is installed on the guide member (61) and is used to adjust the contact position of the passive roller (622) and the active roller (621) to guide the paper of different sizes to move forward, and to correct the tilted posture of the paper during the conveying process.

2. A double-sided printing and conveying device according to claim 1, characterized in that: The correction adjustment mechanism (63) comprises a first rack (631), a central gear (632), a second rack (633), a first slider (634), a second slider (635) and a locking assembly (636); the central gear (632) is rotatably mounted on the central portion of the guide member (61); the first rack (631) and the second rack (633) are slidably mounted on the guide member (61) perpendicular to the paper advancing direction, and are respectively meshed and connected with two sides of the central gear (632); the first rack (631) and the second rack (633) are respectively meshed and connected with two sides of the central gear (632); One end is fixedly connected to the passive roller bracket (623) through the first slider (634), one end of the second rack (633) is fixedly connected to the second slider (635), and the two opposite side surfaces of the first slider (634) and the second slider (635) are respectively provided with guide grooves for correcting the advancing direction of the paper; the locking component (636) is installed in the through hole of the second slider (635) and is used to push and pull the second slider (635) to drive the second rack (633) to move or to lock and fix the second slider (635) on the guide member (61).

3. A double-sided printing and conveying device according to claim 2, characterized in that: The locking assembly (636) comprises a movable block (6361), a locking spring (6362) and a locking block (6363); the movable block (6361) is rotatably mounted in the through hole of the second slider (635); a handle (63611) for pressing is provided on the top thereof, and a U-shaped groove with an opening facing downward is provided on the lower end thereof; the locking block (6363) is movably mounted in the U-shaped groove of the movable block (6361); the top thereof is connected to the inner wall of the U-shaped groove through the locking spring (6362); the bottom thereof is provided with a protruding tooth (63632); the protruding tooth (63632) is meshedly connected with a row of tooth grooves (615) provided on the guide member (61).

4. A double-sided printing and conveying device according to claim 3, characterized in that: V-shaped through holes (63613) are provided on both sides of the U-shaped groove of the movable block (6361), and supporting ears (63631) are provided on both sides of the upper end of the locking block (6363), and the supporting ears (63631) are slidably and rotatably connected with the V-shaped through holes (63613).

5. A double-sided printing and conveying device according to claim 2, characterized in that: The guide groove comprises a guide surface for guiding the paper and a correction surface for correcting the side edge of the paper. The guide surfaces of the two guide grooves are parallel to the upper surface of the guide member (61) and are located in the same horizontal plane. The correction surface is perpendicular to the guide surface.

6. A double-sided printing and conveying device according to claim 2, characterized in that: The first slider (634) and the second slider (635) are slidably connected to the first guide rail (613) and the second guide rail (614) respectively, and the first guide rail (613) and the second guide rail (614) are fixedly mounted on the outer sides of the first rack (631) and the second rack (633) respectively.

7. A double-sided printing and conveying device according to claim 1, characterized in that: The guide member (61) is composed of a flat plate, and a plurality of longitudinal guide ribs (611) extending along the advancing direction of the paper are arranged on the upper surface of the flat plate.

8. A double-sided printing and conveying device according to claim 7, characterized in that: A groove (612) for installing the correction adjustment mechanism (63) is transversely formed in the middle portion of the guide member (61).

9. A double-sided printing and conveying device according to claim 1, characterized in that: The paper feeding mechanism (62) further comprises a driving pulley (624), a toothed belt (627), a passive pulley (628) and a paper feeding roller (629). The driving roller (621) is installed on the rear side of the guide member (61), i.e., the paper feeding side, and one end of the driving roller (621) is coaxially fixedly connected to the driving pulley (624) and the end gear (625). The paper feeding roller (629) is rotatably installed transversely at the middle of the front side of the guide member (61) via a paper feeding roller shaft, and one end of the driving roller (621) is coaxially fixedly connected to the passive pulley (628). The passive pulley (628) is connected to the driving pulley (624) via a toothed belt (627).

10. A double-sided printer, characterized in that: It comprises a housing and a paper feeding unit (10), a printing unit (20), a fixing unit (30), a paper discharging unit (40), a picking device (50) and a double-sided printing conveying device (60) according to any one of claims 1 to 9, which are arranged in the housing; The paper feed unit (10) is used to provide printing paper, the pickup device (50) is used to pick up the paper stacked on the paper feed unit (10), and deliver it to the printing station after turning it over; the printing unit (20) is used to form a toner image on the paper, the fixing unit (30) is used to fix the toner image on the paper, the paper discharge unit (40) is used to turn over the printed and fixed paper and discharge it, and the double-sided printing conveying device (60) is used to convey the paper arriving at the paper discharge unit (40) to the printing unit (20) again in the opposite direction for reverse printing and imaging.

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