Double-sided printing conveying device and double-sided printer

Abstract

The utility model 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 correction adjusting mechanism so as to guide paper of different sizes to advance, the inclination 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

Double-sided printing conveyor and double-sided printer Technical Field

[0001] This utility model relates to the field of printer technology, specifically to a double-sided printing conveyor and a double-sided printer. Background Technology

[0002] Duplex printers are indispensable equipment 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 paper of a set size and cannot be matched with paper transport units to print paper of any size, which greatly limits the application of duplex printers. For example, Chinese patent CN105565020A discloses an image forming apparatus and its duplex printing paper transport unit, which can print two different sizes of paper. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a double-sided printing conveyor and a double-sided printer.

[0004] The technical solution adopted in this utility model is:

[0005] A double-sided printing conveyor includes:

[0006] A guide component, used to guide the paper along a predetermined path;

[0007] A paper feeding mechanism for conveying paper along the conveying direction includes an active roller and a passive roller rotatably mounted on a guide perpendicular to the paper conveying direction. The length of the active roller matches the maximum size of the paper. The active roller is connected to an end gear via a shaft to receive power from a power source in the printer. The passive roller is movably positioned above the active roller via a passive roller bracket. The passive roller cooperates with the active roller to guide the paper forward.

[0008] The correction and adjustment mechanism, mounted on the guide, is used to adjust the contact position of the passive roller and the active roller to guide paper of different sizes forward, and to correct the tilting posture of the paper during the conveying process.

[0009] Furthermore, 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 in the center of the guide. The first and second racks are slidably mounted on the guide perpendicular to the paper's forward direction and are respectively meshed with the two sides of the central gear. One end of the first rack is fixedly connected to the passive roller bracket via the first slider, and one end of the second rack is fixedly connected to the second slider. The two opposite sides of the first and second sliders are respectively provided with guide grooves for correcting the paper's forward direction. The locking assembly is installed in the through hole of the second slider and is used to push and pull the second slider to move the second rack or to lock and fix the second slider on the guide.

[0010] By cooperating with the first rack, the second rack, and the central gear, the contact position of the passive roller and the active roller can be adjusted arbitrarily to adjust the size of the paper being conveyed. The adjusted rack can be locked and fixed in the corresponding position by the locking assembly, thereby ensuring the stability and smoothness of the paper conveying.

[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, and its top is provided with a handle for pressing, and its lower end is provided with a U-shaped groove with an opening facing downward. The locking block is movably installed in the U-shaped groove of the movable block, and its top is connected to the inner wall of the U-shaped groove through the locking spring. Its bottom is provided with protruding teeth, which mesh with a row of toothed grooves opened on the guide.

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

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

[0014] The V-shaped through hole is designed to accommodate the movement of the locking block.

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

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

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

[0018] To ensure the stability of the movement of the first and second racks, thereby ensuring effective contact between the passive and active rollers, ensuring stable and smooth paper feeding, and effectively correcting the tilting posture of the paper during the feeding process.

[0019] Furthermore, the guide is composed of a flat plate, the upper surface of which has several longitudinal guide ribs extending along the paper's forward direction. This facilitates the insertion and withdrawal of the duplex printing conveyor during use, and the longitudinal guide ribs reduce friction during paper transport.

[0020] Furthermore, a groove is laterally provided in the middle of the guide for mounting the calibration adjustment mechanism. This prevents the calibration adjustment mechanism from interfering with paper feeding.

[0021] Furthermore, the paper feeding mechanism also includes a drive pulley, a toothed belt, a driven pulley, and a paper feed roller. The drive roller is installed on the rear side of the guide, i.e. the paper feeding side, and one end of it is coaxially fixedly connected to the drive pulley and the end gear. The paper feed roller is rotatably installed laterally on the front side of the guide through the paper feed roller shaft, and one end of it is coaxially fixedly connected to the driven pulley. The driven pulley (628) is connected to the drive pulley through the toothed belt.

[0022] The design of the paper feed rollers further ensures stable and smooth paper delivery.

[0023] A duplex printer includes a housing and a paper feeding unit, a printing unit, a fixing unit, a paper ejection unit, a pickup device, and any one of the duplex printing conveying devices disposed within the housing. The paper feeding unit provides printing paper, the pickup device picks up the paper stacked on the paper feeding unit, flips it over, and delivers it to the printing station. The printing unit forms a toner image on the paper, the fixing unit fixes the toner image on the paper, the paper ejection unit flips the printed and fixed paper over and ejects it, and the duplex printing conveying device conveys the paper arriving at the paper ejection unit back to the printing unit in the opposite direction for reverse printing.

[0024] The beneficial effects of this utility model are:

[0025] 1. The double-sided printer of this utility model can adjust the size of the paper being transported by the double-sided printing conveyor to match the paper transport unit, thereby realizing double-sided printing of paper of any size.

[0026] 2. The double-sided printing conveying device of this utility model can arbitrarily adjust the contact position of the passive roller and the active roller through the correction and adjustment mechanism to guide paper of different sizes forward, and can correct the tilt state of paper of any size during the conveying process, thereby realizing double-sided printing of paper of any size, which greatly expands the application scenarios of double-sided printers. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the duplex printer of this application.

[0028] Figure 2 is a schematic diagram of the structure of the duplex printer of this application.

[0029] Figure 3 is a front view of the double-sided printing conveyor of this application.

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

[0031] Figure 5 is a structural schematic diagram of the double-sided printing conveyor of this application in the installed state.

[0032] Figure 6 is a structural schematic diagram of the locking assembly of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.

[0034] Referring to Figures 1 and 2, this application provides a duplex printer, including a housing and a paper feed unit 10, a printing unit 20, a fixing unit 30, a paper discharge unit 40, a pickup device 50, and a duplex printing transport device 60 disposed within the housing.

[0035] The front of the casing has a paper inlet 101 and a paper outlet 102, and the rear has an opening 103. The paper feeding unit 10, printing unit 20, fixing unit 30, paper outlet unit 40, and pickup device 50 are all existing technologies.

[0036] The paper feed unit 10 includes a paper tray, which is located at the bottom of the machine housing, and its outlet is connected to the paper inlet 101.

[0037] The pickup device 50 is located above the paper tray and near the rear of the printer. The pickup device 50 includes a pickup roller 51 and a first conveyor roller 52 arranged sequentially along the paper transport path. The pickup roller 51 is used to pick up the paper stacked in the paper tray, flip it over, and then deliver it to the printing station via the first conveyor roller 52.

[0038] The paper discharge unit 40 is disposed on top of the printer and includes a second conveyor roller 41, a third conveyor roller 42, and a paper discharge tray 43 arranged sequentially along the paper transport path. The paper discharge tray 43 is connected to the paper discharge port 102. The second conveyor roller 41 is used to flip the printed and fixed paper over and discharge it to the paper discharge tray 43 via the third conveyor roller 42, and stack it on the paper discharge tray 43.

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

[0040] The duplex printing conveyor 60 is positioned between the paper feed unit 10 and the paper feed unit 10, with its paper output end located below the pickup device 50. Specifically, as shown in Figure 1, an opening 103 is provided on the rear side wall of the housing for inserting or retracting the duplex printing paper conveyor 60. Inside the opening 103, a guide rail (not shown) is provided to guide and support the duplex printing paper conveyor 60. When the duplex printing paper conveyor 60 is installed in the predetermined position, it is vertically positioned between the paper tray and the paper feed unit 10, with its paper output end located below the pickup device 50.

[0041] During the processing of this application:

[0042] In single-sided printing, the paper in the paper tray is picked up by the paper pickup device 50 and enters the printing unit 20 for single-sided printing to form a toner image. Then it enters the fixing unit 30 to fix the toner image on the paper, and finally reaches the paper discharge unit 40 and is discharged through the paper discharge port 102.

[0043] In the case of double-sided printing, the paper that reaches the paper discharge unit 40 is transported again by the double-sided printing conveyor 60 to the printing unit 20 in the opposite direction for reverse printing imaging, and then enters the fixing unit 30 and the paper discharge unit 40 in sequence, and is discharged through the paper discharge port 102.

[0044] Referring to Figures 3 and 4, the duplex printing conveyor 60 includes a guide 61, a paper feeding mechanism 62, and a correction and adjustment mechanism 63. The guide 61 guides the paper along a predetermined path. The guide 61 is composed of a flat plate, and the upper surface of the plate is provided with several longitudinal guide ribs 611 extending along the paper's forward direction. The paper travels along the upper surface of the longitudinal guide ribs 611, reducing friction. A groove 612 for mounting the correction and adjustment mechanism 63 is laterally opened in the middle of the plate. A first guide rail 613 and a second guide rail 614 are arranged parallel to each other in the groove 612. The inner side of the second guide rail 614 is provided with a row of teeth 615, and the length direction of the teeth extends perpendicular to the direction of the guide rail.

[0045] The calibration and 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 mounted in the middle of the groove 612, and the first rack 631 and the second rack 633 are respectively mounted on both sides of the central gear 632 and mesh with the sides of the central gear 632. 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. One end of the first rack 631 is fixed to the first slider 634, and the other end extends in a direction parallel to the first guide rail 613. One end of the second rack 633 is fixed to the second slider 635, and the other end extends in a direction parallel to the second guide rail 614. The first slider 634 and the second slider 635 are located on both sides of the central gear 632. The opposite sides 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 correcting the paper's forward direction. The first guide groove 6341 and the second guide groove 6342 have the same structure, both including a guide surface for guiding the paper and a correction surface for correcting the side of the paper. Both guide surfaces 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. The second slider 635 is provided with a through groove penetrating its upper and lower surfaces.

[0046] Referring 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 has a handle 63611 for pressing, and the lower end has a downward-facing U-shaped groove for mounting the locking spring 6362 and the locking block 6363. Both sides of the movable block 6361 have lugs 63612 for rotatably connecting to the second slider 635 and V-shaped through holes 63613 for slidably connecting to the locking block 6363. The upper end of the locking spring 6362 is fixed to the inner bottom surface of the U-shaped groove, and the lower end is fixedly connected to the locking block 6363. The locking block 6363 has lugs 63631 on both sides that slide in conjunction with the V-shaped through holes 63613, and protruding teeth 63632 at its bottom.

[0047] The movable block 6361 is rotatably mounted in the through groove of the second slider 635 via its lug 63612. One side of the through groove has an opening for pressing the handle 63611. The locking block 6363 is slidably mounted in the U-shaped groove of the movable block 6361 via its lug 63631. The lower end of the locking block 6363 passes through the U-shaped groove and is engaged with the tooth groove 615 via its protruding teeth 63632.

[0048] Pressing the handle 63611 causes the movable block 6361 to rotate around its lug 63612. The locking spring 6362 pulls the locking block 6363 upward, causing the protruding tooth 63632 to disengage from the tooth groove 615, allowing the second slider 635 to slide freely on the second guide rail 614. Releasing the handle 63611 causes the locking block 6363 to slide downward under the spring force of the locking spring 6362. The protruding tooth 63632 engages with the tooth groove 615, locking the second slider 635 onto the guide member 61.

[0049] The paper feeding mechanism 62 includes a drive roller 621, a driven roller 622, a driven roller support 623, a drive pulley 624, an end gear 625, a toothed belt 627, a driven pulley 628, and a paper feed roller 629. The drive roller 621 is rotatably and laterally mounted on the rear side of the guide 61 via a drive roller shaft, and its length matches the maximum size of the paper. One end of the drive roller 621 is coaxially and fixedly connected to the drive pulley 624 and the end gear 625. The drive roller 621 is connected to the end gear 625 via a shaft to receive power from a power source (not shown) in the duplex printer. The paper feed roller 629 is rotatably and laterally mounted on the front center of the guide 61 via a paper feed roller shaft. One end of the roller is coaxially and fixedly connected to the driven pulley 628, which is connected to the drive pulley 624 via the toothed belt 627. The drive roller 621 is driven to rotate by the end gear 625, which in turn drives the paper feed roller 629 to rotate synchronously via the toothed belt 627.

[0050] One end of the passive roller bracket 623 is fixed to the first slider 634, and the other end extends above the active roller 621, with an opening slot at the extended end. The passive roller 622 is rotatably mounted in the opening slot of the passive roller bracket 623 via a passive roller shaft. When the passive roller bracket 623 slides along the first guide rail 613, the passive roller 622 is always positioned above the active roller 621 and is in frictional rotational connection with the active roller 621 to provide constant contact pressure, thereby ensuring a constant conveying force for the paper.

[0051] By adjusting the contact position between the passive roller 622 and the active roller 621, paper of different sizes can be guided forward, thereby enabling double-sided printing of paper of any size.

[0052] The working principle of the double-sided printing conveyor 60 is as follows:

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

[0054] When the paper size needs to be adjusted, pull out the duplex printing conveyor 60, press the handle 63611 to disengage the locking block 6363 from the toothed groove 615, manually push the second slider 635 towards the central gear 632, the second rack 633 drives the central gear 632 to rotate clockwise, the central 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 correction surfaces of the first guide groove 6341 and the second guide groove 6342 decreases, the passive roller 622 moves towards the middle of the active roller 621, and the paper size is reduced; when the appropriate distance is reached, release the handle 63611, so that the bottom protrusion 63632 of the locking block 6363 engages with the toothed groove 615, locking the position of the first slider 634 and the second slider 635, and insert the duplex printing conveyor 60 into the printer housing.

[0055] By using the combination of rack and pinion and gear, and the combination of locking block and tooth groove 615, the size of the printing paper can be adjusted arbitrarily, greatly expanding the application scenarios of duplex printers.

[0056] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A double-sided printing conveyor, characterized in that, include: A guide (61) is used to guide the paper along a predetermined path; a paper feeding mechanism (62) is used to feed the paper along the conveying direction, including an active roller (621) and a passive roller (622) rotatably mounted on the guide (61) perpendicular to the paper conveying direction. 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 from a power source in the printer. The passive roller (622) is movably disposed above the active roller (621) via a passive roller bracket (623). The passive roller (622) cooperates with the active roller (621) to guide the paper forward; and a correction and adjustment mechanism (63) is mounted on the guide (61) to adjust the contact position of the passive roller (622) and the active roller (621) to guide the paper of different sizes forward, and to correct the tilting posture of the paper during the conveying process.

2. The double-sided printing conveying device according to claim 1, characterized in that, The correction and adjustment mechanism (63) includes 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 center of the guide (61). The first rack (631) and the second rack (633) are slidably mounted on the guide (61) perpendicular to the paper's forward direction and are respectively meshed with the two sides of the central gear (632). The first rack (631)... One end of the first slider (634) is fixedly connected to the passive roller bracket (623), and one end of the second rack (633) is fixedly connected to the second slider (635). The first slider (634) and the second slider (635) are respectively provided with guide grooves for correcting the paper's forward direction on their opposite sides. The locking assembly (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 the second slider (635) on the guide (61).

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

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

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

6. A double-sided printing 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. The first guide rail (613) and the second guide rail (614) are fixedly installed on the outside of the first rack (631) and the second rack (633) respectively.

7. A double-sided printing conveying device according to claim 1, characterized in that, The guide (61) is made of a flat plate, and the upper surface of the plate is provided with a number of longitudinal guide ribs (611) extending along the paper forward direction.

8. A double-sided printing conveying device according to claim 7, characterized in that, The guide (61) has a groove (612) in the middle part for installing the calibration adjustment mechanism (63).

9. A double-sided printing conveying device according to claim 1, characterized in that, The paper feeding mechanism (62) also includes a drive pulley (624), a toothed belt (627), a driven pulley (628), and a paper feed roller (629). The drive roller (621) is installed on the rear side of the guide (61), i.e. the paper feeding side, and one end of it is coaxially fixedly connected to the drive pulley (624) and the end gear (625). The paper feed roller (629) is rotatably installed laterally on the front middle of the guide (61) through the paper feed roller shaft, and one end of it is coaxially fixedly connected to the driven pulley (628). The driven pulley (628) is connected to the drive pulley (624) through the toothed belt (627).

10. A duplex printer, characterized in that, The device includes a housing and a paper feeding unit (10), a printing unit (20), a fixing unit (30), a paper discharge unit (40), a pickup device (50), and a duplex printing conveyor device (60) as described in any one of claims 1-9. The paper feeding unit (10) is used to provide printing paper, the pickup device (50) is used to pick up the paper stacked on the paper feeding unit (10), flip it over, and deliver it to the printing station. 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 flip the printed and fixed paper over and discharge it, and the duplex printing conveyor device (60) is used to transport the paper that has reached the paper discharge unit (40) back to the printing unit (20) in the opposite direction for reverse printing imaging.

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