A main drive shaft of a laser printer

Abstract

The utility model belongs to printer technical field especially relates to a main drive shaft of laser printer, including the axle body, is equipped with the composite recess mechanism on the axle body, the composite recess mechanism includes first recess, second recess, third recess and fourth recess in proper order along the axle body direction, first recess is equipped with first radial through -hole on first recess, is equipped with second radial through -hole and third radial through -hole on second recess, is equipped with fourth radial through -hole and fifth radial through -hole on fourth recess, first radial through -hole positioning pin is connected with motor output gear, second radial through -hole is connected with selenium drum drive gear through positioning pin, third radial through -hole is connected with paper feed roller synchronous gear through positioning pin, fourth radial through -hole is connected with fixing pressure adjusting rod, the U type groove of photoelectric sensor is bridged in the fifth radial through -hole directly above, through the composite recess mechanism, can improve the stability and accuracy of laser printer.

Description

Technical Field

[0001] This utility model belongs to the field of printer technology, and in particular relates to a main drive shaft for a laser printer. Background Technology

[0002] The main drive shaft in a laser printer is the core component of the entire transmission system, undertaking the crucial functions of power distribution and synchronization control. The main drive shaft distributes power from the main motor to the drum unit, paper feed system, and fuser unit, maintaining synchronized movement across these subsystems, requiring precise power transmission. However, existing main drive shafts are coupled to multiple loads, resulting in significant torque fluctuations at the load contact points. These uneven torque fluctuations further exacerbate wear on the meshing area between the main drive shaft and the gears. Wear on the plating at the meshing area further affects the transmission accuracy of the main drive shaft, leading to a decrease in the stability and accuracy of the laser printer during printing. Utility Model Content

[0003] The purpose of this invention is to provide a main drive shaft for a laser printer, which aims to solve the problem of large torque fluctuations when the main drive shaft drives multiple loads in the prior art, thereby improving the stability and accuracy of the laser printer.

[0004] To achieve the above objectives, this utility model provides a main drive shaft for a laser printer, comprising a shaft body with a composite groove mechanism. The composite groove mechanism includes, sequentially along the shaft body, a first groove, a second groove, a third groove, and a fourth groove. The first groove is located at a first end of the shaft body. The first groove has a first radial through hole. The second groove has a second radial through hole and a third radial through hole. The fourth groove has a fourth radial through hole and a fifth radial through hole.

[0005] The first radial through hole is connected to the motor output gear via a positioning pin; the second radial through hole is connected to the drum drive gear via a positioning pin; the third radial through hole is connected to the paper feed roller synchronous gear via a positioning pin; the fourth radial through hole is connected to the fixing pressure adjustment rod; and a photoelectric sensor is connected directly above the fifth radial through hole.

[0006] As an optional solution of this utility model, the surface of the shaft is plated with a 3-5 μm electroless nickel layer.

[0007] As an optional embodiment of this invention, the second groove and the fourth groove are on the same plane; the first groove is axially offset relative to the second groove along the Z-axis.

[0008] As an optional solution of this utility model, the third groove is offset at an angle relative to the second groove.

[0009] As an optional solution of this utility model, the second end of the shaft is provided with a shaft end plug structure.

[0010] As an optional embodiment of this invention, the third groove is a non-porous lubrication groove that stores grease.

[0011] The above-mentioned technical solutions in the main drive shaft of a laser printer provided by this utility model embodiment have at least one of the following technical effects:

[0012] This application provides a main drive shaft for a laser printer. By setting a composite groove mechanism on the shaft body, multiple loads are driven in a distributed manner, avoiding the concentration of torque generated at the load contact ends at a single position on the shaft body, thus improving the stability and accuracy of the laser printer. A first radial through-hole in the first groove positions the motor coupling. Second and third radial through-holes in the second groove provide multi-stage transmission synchronization control for the drum drive gear and the paper feed roller synchronization gear, respectively. An axially offset first groove compensates for the centroid offset caused by the radial holes in the second and fourth grooves, reducing torque imbalance during transmission. An angularly offset third groove optimizes torque transmission between the second and fourth grooves, resulting in a more uniform shear stress distribution. A fourth radial through-hole in the fourth groove connects to a fixing pressure adjusting pin, enabling adaptive pressure adjustment. A photoelectric sensor is connected across a fifth radial through-hole in the fourth groove to monitor the main drive shaft's rotational speed in real time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the main drive shaft of a laser printer according to the present invention.

[0015] Figure 2 This is a top view of the main drive shaft of a laser printer according to this utility model.

[0016] Figure 3 This is a side view of the main drive shaft of a laser printer according to the present invention.

[0017] The following are the labeling elements in the figure:

[0018] 1. Shaft body; 2. First groove; 3. Second groove; 4. Third groove; 5. Fourth groove; 6. Shaft end plug structure; 201. First radial through hole; 301. Second radial through hole; 302. Third radial through hole; 501. Fourth radial through hole; 502. Fifth radial through hole. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] It should be noted that the main drive shaft of this utility model is applicable to HP LaserJet Enterprise M506dn printers.

[0024] In a specific embodiment of this utility model, reference is made to Figure 1 , Figure 2 and Figure 3 A main drive shaft for a laser printer is provided, comprising a shaft body 1 with a total length of 340.3 mm and a diameter of 5.98 mm. The shaft body 1 is provided with a composite groove mechanism, which sequentially includes a first groove 2, a second groove 3, a third groove 4, and a fourth groove 5 along the direction of the shaft body 1. The first groove 2 is located at the first end of the shaft body 1, with a length of 23.8 mm and a groove depth of 0.99 mm. The second groove 3 is located 124.1 mm from the starting end of the first groove 2 (the first end of the shaft body 1), with a length of 18.1 mm and a groove depth of 1.49 mm. The third groove 4 is located 146 mm from the starting end of the first groove 2, with a length of 6.4 mm. The fourth groove 5 is located 102 mm from the second end of the shaft body 1, with a length of 18.1 mm and a groove depth of 1.49 mm.

[0025] In a preferred embodiment, a first radial through hole 201 is provided on the first groove 2. The first radial through hole 201 is 5.25mm away from the starting end of the first groove 2. The opening of the first radial through hole 201 is chamfered and deburred. The diameter of the first radial through hole 201 is 2.05mm. A positioning pin passes through the first radial through hole 201. The part of the positioning pin that passes through is precisely engaged with the groove of the motor output gear, so that the motor output gear can drive the drive shaft to rotate when it rotates.

[0026] In a preferred embodiment, the second groove 3 is provided with a second radial through hole 301 and a third radial through hole 302. The second radial through hole 301 is 4.3 mm from the starting end of the second groove 3; the third radial through hole 302 is 4.3 mm from the ending end of the second groove 3. The openings of the second radial through holes 301 and 302 are chamfered and deburred. The diameters of both the second radial through holes 301 and 302 are 2.48 mm, and they are symmetrically distributed. A positioning pin passes through the second radial through hole 301, and the protruding part of the positioning pin precisely engages with the groove of the drum drive gear, so that the rotation of the drive shaft drives the drum drive gear to rotate simultaneously. A positioning pin passes through the third radial through hole 302, and the protruding part of the positioning pin precisely engages with the groove of the paper feed roller synchronous gear, so that the rotation of the drive shaft drives the paper feed roller synchronous gear to rotate simultaneously.

[0027] In a preferred embodiment, the second groove 3 and the fourth groove 5 are on the same plane, and the planes where the first groove 2 and the second groove 3 are located have an axial offset of 0.5mm on the Z-axis. This axial offset can compensate for the centroid offset caused by the radial holes of the second groove 3 and the fourth groove 5, and reduce the amount of torque imbalance during transmission.

[0028] In a preferred embodiment, the third groove 4 is offset by an angle of 5° to 15° relative to the second groove 3. The inclined third groove 4 can optimize the torque transmission between the second groove 3 and the fourth groove 5, making the shear stress distribution more uniform.

[0029] In a preferred embodiment, the third groove 4 is a non-porous lubrication groove that stores grease. When the drive shaft rotates, the lubricating oil is evenly spread along the groove wall and drive shaft under the action of centrifugal force, which can reduce the friction between the drive shaft and the motor output gear, the drum drive gear and the paper feed roller synchronous gear. The non-porous structure can prevent the oil from being thrown out.

[0030] In a preferred embodiment, the fourth groove 5 is provided with a fourth radial through hole 501 and a fifth radial through hole 502. The fourth radial through hole 501 is 4.3 mm from the starting end of the fourth groove 5; the fifth radial through hole 502 is 4.3 mm from the ending end of the fourth groove 5; the openings of the fourth radial through hole 501 and the fifth radial through hole 502 are chamfered and deburred, and the diameters of the fourth radial through hole 501 and the fifth radial through hole 502 are both 2.48 mm; the fourth radial through hole 501 and the fifth radial through hole 502 are symmetrically distributed. The fourth radial through-hole 501 is connected to the fixing pressure adjusting rod, which contains a pressure sensor that detects the pressure within the fourth radial through-hole 501. When the temperature rises, the fixing roller expands, the pressure sensor detects the increased pressure, and the control system reduces the pressure. When the paper thickness increases, the gap between the fixing rollers increases, the pressure sensor detects the decreased pressure, and the control system increases the pressure, achieving adaptive pressure adjustment. This prevents excessive or insufficient pressure within the fourth radial through-hole 501 from affecting the accuracy of the laser printer. A photoelectric sensor is connected directly above the fifth radial through-hole 502, with its U-shaped groove facing the fifth radial through-hole 502. When the drive spindle rotates, the photoelectric sensor records the number of times the emitted light passes through the fifth radial through-hole 502, enabling real-time monitoring of the main drive shaft's rotational speed.

[0031] In a preferred embodiment, the second end of the shaft 1 is provided with a shaft end plug structure 6, which forms an interference fit with the bearing seat or the frame hole to prevent the shaft from moving axially during high-speed operation.

[0032] As a preferred embodiment, the surface of the shaft 1 is plated with a 3-5 μm electroless nickel layer, which can increase the wear resistance of the shaft 1 and extend the service life of the main drive shaft.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A main drive shaft for a laser printer, comprising a shaft body, characterized in that, The shaft is provided with a composite groove mechanism; the composite groove mechanism includes a first groove, a second groove, a third groove and a fourth groove in sequence along the direction of the shaft; the first groove is provided at the first end of the shaft; the first groove is provided with a first radial through hole; the second groove is provided with a second radial through hole and a third radial through hole; the fourth groove is provided with a fourth radial through hole and a fifth radial through hole; The first radial through hole is connected to the motor output gear via a positioning pin; the second radial through hole is connected to the drum drive gear via a positioning pin; the third radial through hole is connected to the paper feed roller synchronous gear via a positioning pin; the fourth radial through hole is connected to the fixing pressure adjustment rod; and a photoelectric sensor is connected directly above the fifth radial through hole.

2. The main drive shaft of a laser printer according to claim 1, characterized in that, The shaft surface is plated with a 3-5µm electroless nickel layer.

3. The main drive shaft of a laser printer according to claim 1, characterized in that, The second groove and the fourth groove are on the same plane; the first groove is axially offset relative to the second groove along the Z-axis.

4. The main drive shaft of a laser printer according to claim 3, characterized in that, The third groove is offset at an angle relative to the second groove.

5. The main drive shaft of a laser printer according to claim 1, characterized in that, The second end of the shaft is provided with a shaft end plug structure.

6. The main drive shaft of a laser printer according to claim 1, characterized in that, The third groove is a non-porous lubrication groove that stores grease.

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