Automatic reversing gear mechanism and double-sided printing method

Abstract

The invention provides an automatic reversing gear mechanism which comprises a supporting base body, an input gear, a transmission gear, a first planetary gear set, a second planetary gear set and a switching control part, the input gear, the transmission gear, the first planetary gear set, the second planetary gear set and the switching control part are connected to the supporting base body, the input gear is meshed with the first planetary gear set, and every two of the first planetary gear set, the second planetary gear set and the transmission gear are meshed. The invention further provides a double-sided printing method. The input gear is driven to conduct steering motion; in the first state, the switching control part and a sun gear of the first planetary gear set are locked so as to drive the transmission gear to rotate in the first direction. In the second state, the switching control part is locked with the sun gear of the second planetary gear set so as to drive the transmission gear to rotate in the second direction, and the first direction is opposite to the second direction. The device has the beneficial effects that under the condition that an original main transmission mode is not changed, automatic switching of the rotation direction of the gear at the output end can be achieved, the occupied space of the structure is small, and the applicability is wide.

Description

Technical Field

[0001] The present invention belongs to the technical field of office equipment, and in particular relates to an automatic reversing gear mechanism and a duplex printing method. Background Art

[0002] In the existing technology, for automatic duplex printing, it is necessary to reverse the paper discharge roller so that the paper tail becomes the paper head, and the paper re-enters the movement to achieve paper turning. Therefore, it is necessary to realize the automatic switching of the rotation direction of the output gear while the rotation direction of the input gear remains unchanged. New office equipment can achieve the self-service duplex printing function by reversing the motor or other conventional mechanisms. However, for the upgrade and improvement of old models, due to the influence of the space limitation of the original model and the original transmission form, the upgrade difficulty and cost are relatively high. There are technical problems such as high difficulty and high cost in upgrading and transforming old single-sided printing models to automatic duplex printing without changing the original main transmission form and under the condition of limited space. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides an automatic reversing gear mechanism and a duplex printing method, which are particularly suitable for application or transformation of models with limited space.

[0004] The technical solution adopted by the present invention is: an automatic reversing gear mechanism, including a support base and an input gear, a transmission gear, a first planetary gear set, a second planetary gear set and a switching control part connected to the support base. The input gear meshes with the first planetary gear set, and the first planetary gear set, the second planetary gear set and the transmission gear mesh with each other pairwise. When the input gear rotates, the switching control part can be in contact and cooperate with the first planetary gear set or the second planetary gear set to adjust the rotation direction of the transmission gear.

[0005] Further, the first planetary gear set and the second planetary gear set have the same structure.

[0006] Further, the first planetary gear set includes a first sun gear, a first ring gear, a first planetary carrier and a first planetary gear disposed on the first planetary carrier. The first ring gear meshes with the first planetary gear, and the first planetary gear meshes with the first sun gear. The second planetary gear set includes a second sun gear, a second ring gear, a second planetary carrier and a second planetary gear disposed on the second planetary carrier. The second ring gear meshes with the second planetary gear, and the second planetary gear meshes with the second sun gear. The second ring gear and the input gear respectively mesh with the first ring gear, and the first planetary carrier and the second planetary carrier respectively mesh with the transmission gear. The switching control part can be in contact with the first sun gear or the second sun gear to lock.

[0007] Further, the first sun gear and the second sun gear are both provided with ratchet structures, and the ratchet structures can be engaged with the switching control part.

[0008] Further, the switching control unit includes a control member, which is rotatably connected to the support base body, and the control member is provided with a locking structure for locking the first sun gear or the second sun gear.

[0009] Further, the switching control unit further includes an electromagnetic controller and an elastic reset member connected to the support base body, and the electromagnetic controller can cooperate with the elastic reset member to drive the control member to move.

[0010] Further, it further includes an output gear connected to the support base body. The output gear is a double gear, and its small-module gear meshes with the transmission gear, and the large-module gear is used to control the movement of the paper output roller.

[0011] The present invention also provides a duplex printing method, which uses the above automatic reversing gear mechanism and includes the following steps:

[0012] Drive the input gear to perform a steering movement; in the first state, the switching control unit locks with the first sun gear to drive the transmission gear to rotate in the first direction; in the second state, the switching control unit locks with the second sun gear to drive the transmission gear to rotate in the second direction, and the first direction is opposite to the second direction.

[0013] The advantages and positive effects of the present invention are: Due to the adoption of the above technical solution, it can realize the automatic switching of the rotation direction of the output gear without changing the original main transmission form; it has the advantages of small structural occupied space, low processing cost, and can be widely applied to the transformation of automatic duplex printers, multi-functional all-in-one machines or single-sided printers with limited space, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of a usage scenario of an embodiment of the present invention;

[0015] Figure 2 is another schematic diagram of a usage scenario of an embodiment of the present invention;

[0016] Figure 3 is an exploded view of the forward first or second planetary gear set in an embodiment of the present invention;

[0017] Figure 4 is an exploded view of the reverse first or second planetary gear set in an embodiment of the present invention;

[0018] In the figure:

[0019] 1, support base body; 2, input gear; 3, first planetary gear set

[0020] 4, second planetary gear set; 5, transmission gear; 6, output gear

[0021] 7, control member; 8, electromagnetic controller; 9, ratchet structure

[0022] 31. First ring gear, 32. First planet gear, 33. First planet carrier

[0023] 34. First sun gear, 41. Second ring gear, 42. Second planet gear

[0024] 43. Second planet carrier, 44. Second sun gear, 81. Spring Detailed implementation manners

[0025] The embodiments of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the invention, rather than all of the embodiments.

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar units or units with the same or similar functions throughout.

[0027] The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. In the description of the present invention, it should be understood that terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense, which can be direct connection, installation or fixation, or indirect connection, installation or fixation. The present invention does not limit this.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "clockwise", "counterclockwise", "axial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] Such as Figures 1 to 4As shown in the figure, a schematic diagram of an embodiment of an automatic reversing gear mechanism of the present invention includes a support base 1, an input gear 2, a transmission gear 5, a first planetary gear set 3, a second planetary gear set 4, and a switching control unit connected to the support base 1. The support base 1 is provided with a number of wheel axles adapted thereto. The input gear 2, the transmission gear 5, the first planetary gear set 3, and the second planetary gear set 4 can all be connected to the corresponding wheel axles of the support base 1 through snap rings to prevent slipping. The input gear 2 meshes with the first planetary gear set 3, and the first planetary gear set 3, the second planetary gear set 4, and the transmission gear 5 mesh with each other pairwise. When the input gear 2 rotates, the switching control unit can contact and cooperate with the first planetary gear set 3 or the second planetary gear set 4 to adjust the rotation direction of the transmission gear 5. Preferably, the switching control unit can be locked with the first sun gear 34 in the first planetary gear set 3 or the second sun gear 44 in the second planetary gear set 4 to switch the rotation direction of the transmission gear 5. In this embodiment, without changing the original main transmission form, when the rotation direction of the input gear 2 remains unchanged, the rotation direction of the transmission gear 5 is switched by the switching control unit contacting and cooperating with the mutually transmitting first planetary gear set 3 and second planetary gear set 4, thereby realizing the double-sided printing function.

[0030] In this embodiment, the structures of the first planetary gear set 3 and the second planetary gear set 4 are the same, which can better facilitate the preparation of the automatic reversing gear mechanism and ensure the preparation cost.

[0031] In this embodiment, the first planetary gear set 3 includes a first sun gear 34, a first ring gear 31, a first planetary carrier 33, and first planetary gears 32 provided on the first planetary carrier 33. The first ring gear 31 meshes with the first planetary gears 32, and the first planetary gears 32 mesh with the first sun gear 34. The second planetary gear set 4 includes a second sun gear 44, a second ring gear 41, a second planetary carrier 43, and second planetary gears 42 provided on the second planetary carrier 43. The second ring gear 41 meshes with the second planetary gears 42, and the second planetary gears 42 mesh with the second sun gear 44. The second ring gear 41 and the input gear 2 respectively mesh with the first ring gear 31. The first planetary carrier 33 and the second planetary carrier 43 are respectively provided with external teeth to mesh with the transmission gear 5. The switching control unit can contact and lock with the first sun gear 34 or the second sun gear 44.

[0032] In this embodiment, the first planet carrier 33 includes a first planet carrier body. The first planet carrier body is provided with external teeth and gear shafts. The first planet gears 32 are rotatably arranged on the first planet carrier body through the gear shafts, and the first planet gears 32 mesh with the internal teeth of the first ring gear 31. The number of the first planet gears 32 is multiple and they are evenly distributed at intervals along the circumferential direction of the first sun gear 34. The multiple first planet gears 32 can better ensure the stability during transmission. Preferably, the number of the first planet gears 32 is two and they are symmetrically arranged with the first sun gear 34 as the center. The first sun gear 34, the first planet carrier 33, and the first ring gear 31 are coaxially arranged. The second planetary gear set 4 has the same structure as the first planetary gear set 3. The second planet carrier 43 includes a second planet carrier body. The second planet carrier body is provided with external teeth and gear shafts. The second planet gears 42 are rotatably arranged on the second planet carrier body through the gear shafts, and the second planet gears 42 mesh with the internal teeth of the second ring gear 41. The number of the second planet gears 42 is multiple and they are evenly distributed at intervals along the circumferential direction of the second sun gear 44. Preferably, the number of the second planet gears 42 is two and they are symmetrically arranged with the second sun gear 44 as the center. The second sun gear 44, the second planet carrier 43, and the second ring gear 41 are coaxially arranged. The first planet gears 32 and the second planet gears 42 have the same specifications and parameters. Through the transmission cooperation of multiple planetary gear sets, the overall space occupation can be better reduced, which is suitable for installation environments with limited space and improves the applicability to the upgrade and transformation of different old machines. External teeth are respectively provided on the outside of the first ring gear 31 and the outside of the second ring gear 41 for meshing with each other, and the external teeth of the first ring gear 31 can mesh with the input gear 2. In this embodiment, external teeth are integrally provided on the outside of the first ring gear 31, the outside of the second ring gear 41, the outside of the first planet carrier 33, and the outside of the second planet carrier 43, so that the ring gears, planet carriers, and sun gears of the two planetary gear sets can rotate freely. The first ring gear 31 is driven by the input gear 2 to rotate directionally. When the switching control part is locked with the first sun gear 34 in the first planetary gear set 3, the corresponding first planet carrier 33 can drive the transmission gear 5 to rotate through the external teeth. When the switching control part is locked with the second sun gear 44 in the second planetary gear set 4, the corresponding second planet carrier 43 in the second planetary gear set 4 can also drive the transmission gear 5 to rotate through the external teeth and the rotation direction is switched to the opposite direction, and the movement directions of the other parts can be adjusted adaptively.

[0033] In this embodiment, ratchet structures 9 are provided on both the first sun gear 34 and the second sun gear 44. The ratchet structures 9 can be engaged with the switching control part. The structure of this embodiment is compact and occupies a small space. The rotation direction of the transmission gear 5 can also be freely switched through the cooperation of the switching control part and the corresponding ratchet structures 9.

[0034] In this embodiment, the switching control part includes a control member 7. The control member 7 is rotatably connected to the support base 1, and a locking structure for locking the first sun gear 34 or the second sun gear 44 is provided at the end of the control member 7.

[0035] In this embodiment, the switching control unit further includes an electromagnetic controller 8 and an elastic reset member connected to the support base 1. The electromagnetic controller 8 can cooperate with the elastic reset member to drive the control member 7 to move. Preferably, the electromagnetic controller 8 is a relay, which is installed on the support base 1 by screws or the like. The elastic reset member can be prepared by using a spring 81. The spring 81 is installed on the core shaft of the relay, and the control member 7 can be connected to the core shaft. The relay can cooperate with the spring 81 to drive the steering movement of the control member 7, so as to realize the engagement of the locking structure with the ratchet structure 9 of the first sun gear 34 or the second sun gear 44.

[0036] In this embodiment, an output gear 6 connected to the support base 1 is further included. The output gear 6 is a double gear. Its small-module gear meshes with the transmission gear 5, and the large-module gear is used to control the movement of the paper output roller. The input gear 2 is used to mesh with the control gear of the original main transmission mechanism.

[0037] On the other hand, the present invention also provides a duplex printing method, which uses the above automatic reversing gear mechanism and includes the following steps:

[0038] Drive the input gear 2 to perform a steering movement; in the first state, the switching control unit is locked with the first sun gear 34 to drive the transmission gear 5 to rotate in the first direction; in the second state, the switching control unit is locked with the second sun gear 44 to drive the transmission gear 5 to rotate in the second direction, and the first direction is opposite to the second direction.

[0039] A business equipment equipped with the above automatic reversing gear mechanism has the following process during duplex printing:

[0040] Drive the input gear 2 to rotate through the original main transmission mechanism. In a use scenario, the input gear 2 is driven to rotate counterclockwise, and the first gear ring 31 meshes with the input gear 2, and the first gear ring 31 rotates clockwise.

[0041] When performing single-sided printing, the electromagnetic controller 8 remains powered off, and the control member 7 is engaged with the ratchet structure 9 of the first sun gear 34 under the action of the spring 81. More specifically, the control member 7 is engaged with the corresponding ratchet structure 9 through the locking structure, so the first sun gear 34 cannot rotate. Also, because the first gear ring 31 rotates clockwise, the first planet carrier 33 rotates clockwise, and the transmission gear 5 meshing with the first planet carrier 33 is driven to rotate counterclockwise, realizing the clockwise rotation of the output gear 6. At this time, the second gear ring 41 is driven by the first gear ring 31 to rotate counterclockwise, the second planet carrier 43 is driven by the transmission gear 5 to rotate clockwise, and the second sun gear 44 is driven to rotate at high speed.

[0042] When double-sided printing is performed, the electromagnetic controller 8 is powered on, and the control member 7 rotates under the action of electromagnetic force, while compressing the spring 81. The locking structure of the control member 7 engages with the ratchet structure 9 of the second sun gear 44. Therefore, the second sun gear 44 cannot rotate. The input gear 2 still maintains counterclockwise rotation and drives the second gear ring 41 to rotate counterclockwise through the first gear ring 31. Also, because the second sun gear 44 cannot rotate, the second planet carrier 43 is driven to rotate counterclockwise. The transmission gear 5 meshes with the second planet carrier 43, so the transmission gear 5 is driven to rotate clockwise, realizing counterclockwise rotation of the output gear 6 to switch the rotation direction. At this time, the first planet carrier 33 is driven by the transmission gear 5, and the first planet carrier 33 rotates counterclockwise. The first gear ring 31 maintains clockwise rotation, and the first sun gear 34 is driven to rotate at high speed.

[0043] In this embodiment, when the relay is powered off, the spring 81 drives the control member 7 to automatically lock the first sun gear 34, forming the default working mode, that is, the single-sided printing function, which can ensure the maintenance of basic functions in case of system failures. Two sets of planetary gear sets are adopted, and each gear ring of each planetary gear set has internal teeth and external teeth. The planet carriers of each planetary gear set are provided with external teeth and are respectively meshed and driven with the same transmission gear 5. The ends of the sun gears of each planetary gear set are provided with ratchet structures for selective locking control. The gear rings, planet carriers, and sun gears of the two sets of planetary gear sets can all rotate freely. By switching the control part to selectively lock with the corresponding sun gear to control the rotation direction of the output gear 6, multiple output functions are realized under the control of a single power input. The swing-type control member 7 is driven by a relay and cooperates with the spring 81 with elastic reset function to form a dual-switching system with fail-safe characteristics. The electromagnetic control can complete the mode switching in a short time to meet the high-efficiency printing requirements. The control member 7 is provided with a locking structure, and the sun gear of each group is provided with a ratchet structure to realize accurate locking function. The structure of this embodiment is compact, occupies a small space, can be flexibly applied to the preparation of printers or multifunctional all-in-ones, and can also be popularized and applied to the upgrade and transformation of single-sided printers, realizing the dual-sided printing function without changing the original transmission method. It can also ensure the preparation or transformation cost and is convenient for popularization.

[0044] The above has described the embodiments of the present invention in detail, but the described content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An automatic reversing gear mechanism, characterized in that: It includes a supporting base and an input gear, a transmission gear, a first planetary gear set, a second planetary gear set and a switching control unit connected to the supporting base, the input gear is meshed with the first planetary gear set, the first planetary gear set, the second planetary gear set and the transmission gear are meshed with each other, and when the input gear rotates, the switching control unit can contact and cooperate with the first planetary gear set or the second planetary gear set to adjust the rotation direction of the transmission gear.

2. The automatic reversing gear mechanism according to claim 1, characterized in that: The first planetary gear set and the second planetary gear set have the same structure.

3. The automatic reversing gear mechanism according to claim 2, characterized in that: The first planetary gear set includes a first sun gear, a first ring gear, a first planet carrier and a first planetary gear arranged on the first planet carrier, the first ring gear is meshed with the first planetary gear, and the first planetary gear is meshed with the first sun gear, the second planetary gear set includes a second sun gear, a second ring gear, a second planet carrier and a second planetary gear arranged on the second planet carrier, the second ring gear is meshed with the second planetary gear, and the second planetary gear is meshed with the second sun gear, the second ring gear and the input gear are respectively meshed with the first ring gear, the first planet carrier and the second planet carrier are respectively meshed with the transmission gear, and the switching control unit can contact the first sun gear or the second sun gear to lock.

4. The automatic reversing gear mechanism according to claim 3, characterized in that: The first sun gear and the second sun gear are both provided with a ratchet structure, and the ratchet structure can be engaged with the switching control unit.

5. The automatic reversing gear mechanism according to claim 3 or 4, characterized in that: The switching control unit includes a control member, which is rotatably connected to the supporting base, and the control member is configured to lock a locking structure of the first sun gear or the second sun gear.

6. The automatic reversing gear mechanism according to claim 5, characterized in that: The switching control unit further comprises an electromagnetic controller and an elastic reset member connected to the supporting base, and the electromagnetic controller can cooperate with the elastic reset member to drive the control member to move.

7. The automatic reversing gear mechanism according to any one of claims 1 to 4, characterized in that: It also includes an output gear connected to the supporting base, wherein the output gear is a double gear, a small modulus gear thereof is meshed with the transmission gear, and a large modulus gear is used to control the movement of the paper output roller.

8. A double-sided printing method, using the automatic reversing gear mechanism according to claim 3 or 4, characterized in that: The steps include: driving the input gear to perform steering movement; In a first state, the switching control unit is locked with the first sun gear to drive the transmission gear to rotate in a first direction; In a second state, the switching control unit is locked with the second sun gear to drive the transmission gear to rotate in a second direction, and the first direction is opposite to the second direction.

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