A printer top cover opening and closing mechanism

Abstract

The application discloses a printer top cover opening and closing mechanism, which comprises a shell, a printer top cover, a swing lever, a selenium drum driving assembly, a swing lever reset spring, a driving nut and a machine body vertical plate; the printer top cover is hingedly connected to the shell through a shaft hole; the machine body vertical plate is perpendicular to the printer top cover and located below the printer top cover; the swing lever is installed on the machine body vertical plate through a swing lever fastening screw and can rotate around the swing lever fastening screw; one end of the swing lever is used for cooperating with an extension part of the printer top cover, and the other end of the swing lever is used for slidingly cooperating with an extension arm of the driving nut; meanwhile, the other end of the swing lever is fixedly connected to the machine body vertical plate through the swing lever reset spring; the driving nut is installed on the machine body vertical plate, the extension arm of the driving nut is inserted into a corresponding long slot hole at the other end of the swing lever, and the driving nut drives the selenium drum driving assembly to move, so that the selenium drum can be disassembled. The printer top cover opening and closing mechanism has simple structure, long service life and convenient installation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of printer technology, and more specifically to a printer top cover opening and closing mechanism. Background Technology

[0002] In printer products, the printer top cover opening and closing mechanism is mainly used for replacing the toner cartridge. In traditional printers, when the top cover is opened, a drive lever rotates, and a cam mechanism drives the toner cartridge drive gear to move outward, causing it to disengage from the toner cartridge. This design results in irregular movements of the drive lever, including displacement, rotation, and twisting, leading to complex stress on the lever. Each action causes repetitive and regular bending deformation, making it prone to fatigue and breakage. Furthermore, the drive lever is hinged to a corresponding slot in the printer top cover, causing considerable inconvenience for printer maintenance. Summary of the Invention

[0003] In view of this, the present invention provides a printer top cover opening and closing mechanism, which has a simple structure, long service life, and is easy to install and maintain.

[0004] The technical solution adopted in this invention is as follows:

[0005] A printer top cover opening and closing mechanism includes a housing, a printer top cover, a rocker arm, a toner cartridge drive assembly, a rocker arm return spring, a drive nut, and a machine body upright plate;

[0006] The printer top cover is hinged to the outer casing via a shaft hole. The upright plate of the printer body is perpendicular to the printer top cover and located on the side below the printer top cover. The swing arm is mounted on the upright plate of the printer body via a swing arm set screw and can rotate around the swing arm set screw. One end of the swing arm is used to engage with the protruding part of the printer top cover, and the other end is used to slide with the extension arm of the drive nut. At the same time, the other end of the swing arm is fixed to the upright plate of the printer body via a swing arm return spring. The drive nut is mounted on the upright plate of the printer body, and the extension arm of the drive nut is inserted into the corresponding long slot hole at the other end of the swing arm. The drive nut drives the toner cartridge drive assembly to move, thereby realizing the installation and removal of the toner cartridge.

[0007] Furthermore, the drum drive assembly includes a drum drive gear, a drum drive gear return spring, and a nut sleeve;

[0008] One end of the nut sleeve is located in the inner hole of the drive nut, and the two are threaded together. At the same time, the nut sleeve is fitted outside the central shaft of the toner cartridge drive gear, and the other end face of the nut sleeve contacts the shoulder end face of the central shaft of the toner cartridge drive gear. One end of the toner cartridge drive gear reset spring is inserted into the corresponding hole of the toner cartridge drive gear, and the other end is fixed to the inner wall of the right side of the housing, in a compressed state.

[0009] Furthermore, the inner hole of the drive nut is machined with multi-start threads, and the mating parts of the nut sleeve and the drive nut are machined with the same multi-start threads.

[0010] Furthermore, the opening and closing mechanism also includes a rocker arm limiting pin, which is fixed to the upright plate of the machine body and located below the rocker arm set screw, and is used to limit the return position of the rocker arm.

[0011] Furthermore, the swing arm limit pin is riveted to the body upright plate.

[0012] Beneficial effects:

[0013] 1. The present invention has a simple structure, long service life, the force of the swing arm is in the same plane and there is no connection with the top cover, the drive nut can only rotate around the axis without displacement, and it is easy to install and maintain.

[0014] 2. The drive gear of this invention engages with the toner cartridge flexibly and reliably without jamming. When the top cover is opened, the drive gear will disengage from the toner cartridge, reducing the risk of damage to the toner cartridge and drive gear due to incorrect operation or handling.

[0015] 3. The present invention has a multi-start thread machined in the inner hole of the drive nut, and the nut sleeve and the drive nut mating part are machined with the same multi-start thread. The drive nut can drive the nut sleeve to move a large distance by rotating at a small angle. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the printer top cover of the present invention in the open state.

[0017] Figure 2 This is a schematic diagram of the printer top cover in the closed state according to the present invention.

[0018] Figure 3 This is a schematic diagram of the printer top cover in the closed state (without the drum drive gear).

[0019] Figure 4 This is a partial cross-sectional view of the toner cartridge drive assembly with the printer top cover closed according to the present invention.

[0020] Among them, 1-outer shell, 2-printer top cover, 3-swing arm set screw, 4-swing arm, 5-toner drum drive gear, 6-swing arm limit pin, 7-swing arm return spring, 8-drive nut, 9-body upright plate, 10-toner drum drive gear return spring, 11-nut sleeve. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] The present invention provides a printer top cover opening and closing mechanism, including a housing 1, a printer top cover 2, a rocker arm 4, a toner cartridge drive assembly, a rocker arm return spring 7, a rocker arm limit pin 6, a drive nut 8, and a machine body upright plate 9.

[0023] like Figure 2 , Figure 3 As shown, the printer top cover 2 is hinged to the outer casing 1 via a shaft hole. The printer top cover 2 has rotating shafts on its inner sides at both ends, and the outer casing 1 has through holes at corresponding positions at both ends. The machine body upright plate 9 is perpendicular to the printer top cover 2 and located on the side below the printer top cover 2. The rocker arm 4 is mounted on the machine body upright plate 9 via a rocker arm set screw 3 and can rotate around the rocker arm set screw 3. One end of the rocker arm 4 engages with the protruding part of the printer top cover 2, and the other end engages with the protruding arm of the drive nut 8. Simultaneously, the other end of the rocker arm 4 is fixed to the machine body upright plate 9 via a rocker arm return spring 7. The rocker arm limit pin 6 is riveted to the machine body upright plate 9 and is located below the rocker arm set screw 3, used to limit the return position of the rocker arm 4.

[0024] The drive nut 8 is installed on the upright plate 9 of the machine body. The inner hole of the drive nut 8 is aligned with the fixing hole of the upright plate 9 of the machine body. It can rotate around the axis of the fixing hole of the upright plate 9 of the machine body without displacement. The extension arm of the drive nut 8 is inserted into the corresponding long slot hole at the other end of the swing rod 4 to drive the toner cartridge drive assembly to move and realize the disassembly and assembly of the toner cartridge.

[0025] The toner cartridge drive assembly includes a toner cartridge drive gear 5, a toner cartridge drive gear return spring 10, and a nut sleeve 11; such as Figure 4 As shown, one end of the nut sleeve 11 is located in the inner hole of the drive nut 8, and the two are threaded together. At the same time, the nut sleeve 11 is fitted outside the central shaft of the toner cartridge drive gear 5, and the other end face of the nut sleeve 11 contacts the shoulder end face of the central shaft of the toner cartridge drive gear 5. One end of the toner cartridge drive gear return spring 10 is inserted into the corresponding hole of the toner cartridge drive gear 5, and the other end is fixed to the inner wall of the right side of the housing, in a compressed state. The housing is a sheet metal part, installed on the upright plate 9 of the housing, and is used to cover the toner cartridge drive gear 5.

[0026] The inner hole of the drive nut 8 is machined with multi-start threads, and the nut sleeve 11 and the part that mates with the drive nut 8 are machined with the same multi-start threads.

[0027] Working principle: When replacing the toner cartridge, during the opening of the printer top cover 2, the limiting effect of the protruding part of the printer top cover 2 on the swing arm 4 is released, and the two disengage. Figure 1 As shown, the rocker arm 4 is reset under the action of the rocker arm reset spring 7, which drives the drive nut 8 to rotate. The nut sleeve 11 moves outward, driving the toner cartridge drive gear 5 to move outward. The compression of the toner cartridge drive gear reset spring 10 increases. When the rocker arm 4 touches the rocker arm limit pin 6, it drives the toner cartridge drive gear 5 to disengage from the corresponding slot of the toner cartridge photosensitive drum, and the toner cartridge can be manually removed.

[0028] After replacing the toner cartridge and installing it in place, close the printer top cover 2. During the closing process, the protruding part of the printer top cover 2 touches the upper end of the swing arm 4, causing the swing arm 4 to swing in the opposite direction around the swing arm set screw 3. This causes the drive nut 8 to rotate in the opposite direction, and the nut sleeve 11 moves inward. The contact force between the nut sleeve 11 and the toner cartridge drive gear 5 disappears. Under the action of the toner cartridge drive gear return spring 10, the toner cartridge drive gear 5 is driven to move inward and insert into the corresponding slot of the toner cartridge photosensitive drum, completing the docking. At this time, the swing arm return spring 7 is stretched to its maximum.

[0029] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A printer top cover opening and closing mechanism, characterized in that, Includes the outer casing, printer top cover, rocker arm, toner cartridge drive assembly, rocker arm return spring, drive nut, and machine body upright plate; The printer top cover is hinged to the outer casing via a shaft hole. The upright plate of the printer body is perpendicular to the printer top cover and located on the side below the printer top cover. The swing arm is mounted on the upright plate of the printer body via a swing arm set screw and can rotate around the swing arm set screw. One end of the swing arm is used to engage with the protruding part of the printer top cover, and the other end is used to slide with the extension arm of the drive nut. At the same time, the other end of the swing arm is fixed to the upright plate of the printer body via a swing arm return spring. The drive nut is mounted on the upright plate of the printer body, and the extension arm of the drive nut is inserted into the corresponding long slot hole at the other end of the swing arm. The drive nut drives the toner cartridge drive assembly to move, thereby realizing the installation and removal of the toner cartridge. The drum drive assembly includes a drum drive gear, a drum drive gear return spring, and a nut sleeve. One end of the nut sleeve is located in the inner hole of the drive nut, and the two are threaded together. At the same time, the nut sleeve is fitted outside the central shaft of the toner cartridge drive gear, and the other end face of the nut sleeve contacts the shoulder end face of the central shaft of the toner cartridge drive gear. One end of the toner cartridge drive gear reset spring is inserted into the corresponding hole of the toner cartridge drive gear, and the other end is fixed to the inner wall of the right side of the housing, in a compressed state. During the opening of the printer top cover, the limit of the printer top cover extension on the swing arm is released, and the two are separated. The swing arm is reset under the action of the swing arm return spring, which drives the drive nut to rotate. The nut sleeve moves outward, driving the toner cartridge drive gear to move outward. The compression of the toner cartridge drive gear return spring increases. When the swing arm hits the swing arm limit pin, it drives the toner cartridge drive gear to disengage from the corresponding slot of the toner cartridge photosensitive drum, and the toner cartridge can be manually removed. After the toner cartridge is installed, close the printer top cover. During the closing process, the protruding part of the printer top cover touches the upper end of the swing arm, causing the swing arm to swing in the opposite direction around the swing arm set screw. This causes the drive nut to rotate in the opposite direction, and the nut sleeve moves inward. The contact force between the nut sleeve and the toner cartridge drive gear disappears. Under the action of the toner cartridge drive gear reset spring, the toner cartridge drive gear is driven to move inward and insert into the corresponding slot of the toner cartridge photosensitive drum, completing the docking.

2. The printer top cover opening and closing mechanism as described in claim 1, characterized in that, The inner hole of the drive nut is machined with multi-start threads, and the mating parts of the nut sleeve and the drive nut are machined with the same multi-start threads.

3. The printer top cover opening and closing mechanism as described in claim 1 or 2, characterized in that, The opening and closing mechanism also includes a rocker arm limiting pin, which is fixed to the upright plate of the machine body and located below the rocker arm set screw, and is used to limit the return position of the rocker arm.

4. The printer top cover opening and closing mechanism as described in claim 3, characterized in that, The swing arm limit pin is riveted to the machine body upright plate.

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