A paper feed roller

Abstract

This utility model discloses a paper feeding roller, including a rubber roller sleeve and a frame. The outer circumference of the rubber roller sleeve has several protrusions, and the rubber roller sleeve is mounted on the frame for feeding paper. This paper feeding roller, with its rubber roller sleeve featuring several protrusions, and the rubber roller sleeve and frame forming a composite structure, provides excellent performance and improves the stability and accuracy of the printer during printing. This paper feeding roller can be applied to multifunction printers.

Description

Technical Field

[0001] This utility model belongs to the field of office supplies technology, specifically relating to a paper feeding roller. Background Technology

[0002] With continuous technological advancements and increasing market demand, the development status and trends of multifunction printers are constantly changing and evolving. Currently, multifunction printers have become indispensable equipment in many enterprises and institutions. The paper feed roller in a multifunction printer is a crucial component, primarily used to deliver paper and ensure stability and accuracy during the printing process. With the continuous advancement of office automation and the development of printing technology, the market demand for printer paper feed rollers is gradually increasing. To improve the performance of paper feed rollers, it is necessary to develop a new type of paper feed roller. Utility Model Content

[0003] To address the aforementioned problems in the prior art, this utility model provides a paper feeding roller with excellent performance, which can improve the stability and accuracy of the printing process.

[0004] The present invention adopts the following technical solution: A paper feed roller includes a rubber roller sleeve and a frame. The outer ring surface of the rubber roller sleeve is provided with a plurality of protrusions. The rubber roller sleeve is disposed on the frame for feeding paper.

[0005] Furthermore, the rubber roller sleeve is an EPDM rubber roller sleeve.

[0006] Furthermore, after the rubber roller sleeve and the skeleton are assembled, the connection between the rubber roller sleeve and the skeleton can withstand a torque of at least 3 kgf·cm.

[0007] Furthermore, the protrusion is a toothed protrusion.

[0008] Furthermore, the gap depth between two adjacent toothed protrusions is at least 0.26 mm.

[0009] Furthermore, based on the cross-section of the rubber roller sleeve, the angle between the center of the normal line at the midpoint of the flat end of one of the toothed protrusions and the normal line at the midpoint of the flat end of the adjacent toothed protrusion is at least 3°.

[0010] Furthermore, the skeleton is provided with a first shaft cavity and a second shaft cavity, and the first shaft cavity is connected to the second shaft cavity.

[0011] Furthermore, the diameter of the cross-section of the second shaft cavity is larger than the diameter of the cross-section of the first shaft cavity.

[0012] Furthermore, the skeleton is either a plastic skeleton or a metal skeleton.

[0013] Furthermore, the skeleton is a polyoxymethylene plastic skeleton.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses a paper feeding roller with several protrusions on its rubber roller sleeve. The rubber roller sleeve and the skeleton form a composite structure for use. This design gives the paper feeding roller of this utility model excellent performance and can improve the stability and accuracy of the printer during the printing process. This paper feeding roller of this utility model can be applied to multifunction printers. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a first-view perspective three-dimensional schematic diagram of "a paper feeding roller" of this utility model; Figure 2 This is a two-dimensional schematic diagram of the "paper feeding roller" of this utility model from a second perspective; Figure 3 This is a three-dimensional schematic diagram of "a paper feeding roller" from a third-view perspective of this utility model; Figure 4 This is a right view of the paper feeding roller of this utility model (wherein, the direction of the burrs is intentionally shown). Figure 5 yes Figure 4 A magnified view of the area at point R; Figure 6 yes Figure 4 Sectional view at TT.

[0016] Figure label: 1 - Paper feed roller; R - Enlarged view symbol; TT - Sectional view symbol; 2-Rubber roller sleeve; 21-Protrusion; A-Burst direction; B-Gap depth; C-Midpoint of flat end; D-Normal; E-Including angle between centers; M-Length of rubber roller sleeve; N-Outer ring diameter; P-Inner ring diameter; 3-Skeleton; F-Skeleton length; 31-First shaft cavity; G-Diameter of the first shaft cavity; H-First end shaft length; K-Second end shaft length; 32-Second shaft cavity; L-Diameter of the second shaft cavity. Detailed Implementation

[0017] The following will provide a clear and complete description of the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0018] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0019] Reference Figures 1 to 6 A paper feed roller 1 includes a rubber roller sleeve 2 and a frame 3. The outer ring surface of the rubber roller sleeve 2 is provided with a plurality of protrusions 21. The rubber roller sleeve 2 is disposed on the frame 3 for conveying paper.

[0020] Reference Figures 1 to 6 In one embodiment, the rubber roller sleeve 2 is an ethylene propylene diene monomer (EPDM) rubber roller sleeve, where EPDM is also known as "Ethylene Propylene Diene Monomer". Preferably, the hardness of the EPDM rubber roller sleeve is JIS A: 21°±3°, where 21° is the target hardness value and ±3° is the allowable tolerance range, that is, the actual hardness JIS A of the EPDM rubber roller sleeve is between 18° and 24°. "JIS A" stands for "Japanese Industrial Standard A".

[0021] Reference Figures 1 to 6 In one embodiment, the coefficient of friction of the rubber surface of the rubber roller sleeve 2 is at least 1.6.

[0022] In another embodiment, the coefficient of friction of the rubber surface of the rubber roller sleeve 2 is 1.8.

[0023] In one embodiment, the surface of the rubber roller sleeve 21 is coated with one or more of "antistatic agent and wear-resistant filler".

[0024] In one embodiment, after the rubber roller sleeve 2 and the skeleton 3 are assembled, the connection between the rubber roller sleeve 2 and the skeleton 3 can withstand a torque of at least 3 kgf·cm. This design is beneficial to solving the problem of delamination between the rubber roller sleeve 2 and the plastic skeleton.

[0025] Reference Figure 4 After the rubber roller sleeve 2 and the skeleton are assembled, the burr direction A of the rubber roller sleeve 2 is as follows: Figure 4 As shown.

[0026] Reference Figures 1 to 6In one embodiment, the protrusion 21 is a toothed protrusion. High-precision CNC (Computer Numerical Control Machining) and EDM (Electrical Discharge Machining) techniques can be used to manufacture the toothed mold. Then, using the toothed mold, the toothed protrusion on the rubber roller sleeve 2 of this invention can be produced. This manufacturing technology achieves high-precision, high-wear-resistance, and high-stability toothed roller sleeve manufacturing.

[0027] Reference Figure 4 and Figure 5 In one embodiment, the slit depth B between two adjacent toothed protrusions 21 is at least 0.26 mm. Preferably, the slit is a V-shaped slit.

[0028] Reference Figure 4 and Figure 5 In one embodiment, based on the front cross section of the rubber roller sleeve 2, the included angle E formed by the normal D of the midpoint C of the flat end of one of the toothed protrusions 21 and the normal D of the midpoint C of the flat end of the adjacent toothed protrusion 21 is at least 3°.

[0029] Reference Figures 1 to 6 In one embodiment, the frame 3 is provided with a first shaft cavity 31 and a second shaft cavity 32, and the first shaft cavity 31 and the second shaft cavity 32 are in communication. The first shaft cavity 31 and the second shaft cavity 32 can be connected to a designated rotating shaft of the printer, respectively.

[0030] Reference Figure 6 In one embodiment, the cross-sectional diameter of the second shaft cavity 32 is larger than the cross-sectional diameter of the first shaft cavity 31.

[0031] In one embodiment, the skeleton 3 is either a plastic skeleton or a metal skeleton.

[0032] Reference Figures 1 to 6 In this embodiment, the skeleton 3 is a polyoxymethylene (POM) plastic skeleton, where POM stands for "Polyoxymethylene". Preferably, the flame retardant rating of the POM plastic skeleton is at least UL94HB, where UL94HB means that the material has passed the HB (Horizontal Burning) rating test in the UL94 (Underwriters Laboratories Standard 94) standard.

[0033] In one embodiment, the paper feed roller 1 of this utility model meets environmental protection standards, wherein the paper feed roller 1 contains Pb (lead) and Cd (cadmium). Substances such as hexavalent chromium, mercury, polybrominated biphenyls (PBBs), and polybrominated diphenyl ethers (PBDEs) comply with RoHS (Restriction of Hazardous Substances Directive) requirements. Specifically, lead (Pb) content: ≤0.1%; cadmium (Cd) content: ≤0.01%; hexavalent chromium (…). Content: ≤0.1%; Mercury (Hg) content: ≤0.1%; Polybrominated biphenyls (PBBs) content: ≤0.1%; Polybrominated diphenyl ethers (PBDEs) content: ≤0.1%.

[0034] Reference Figures 1 to 6 In one embodiment, the length F of the skeleton is 31.43 mm with a tolerance range of ±0.15 mm.

[0035] The diameter G of the first shaft cavity is 3.6 mm, with a tolerance range of ±0.05 mm. Preferably, within the range of 5 mm for the shaft length H of the first end of the first shaft cavity 31, the diameter of the first shaft cavity 31 needs to be controlled, that is, it needs to be ensured that it meets the requirement of "3.6 mm ± 0.05 mm". Similarly, within the range of 5 mm for the shaft length K of the second end of the first shaft cavity 31, the diameter of the first shaft cavity 31 also needs to be controlled, that is, it needs to be ensured that it meets the requirement of "3.6 mm ± 0.05 mm".

[0036] The diameter L of the second shaft cavity is 8.2 mm.

[0037] The length M of the rubber roller sleeve is 20.6 mm, with a tolerance range of ±0.5 mm; the outer ring diameter N of the rubber roller sleeve is 15.26 mm, with a tolerance range of ±0.3 mm; and the inner ring diameter P of the rubber roller sleeve is 10.6 mm, with a tolerance range of ±0.05 mm.

[0038] Reference Figures 1 to 6 In one embodiment, the present invention has the following technical advantages: (1) The paper feed roller 1 of this utility model is composed of an EPDM rubber roller sleeve 2 and a POM plastic skeleton 3. The roller sleeve is made of EPDM, which has strong weather resistance and improves the service life of the paper feed roller 1. At the same time, this utility model preferably adds an antistatic agent and wear-resistant filler to the EPDM rubber roller sleeve to improve the surface performance of the EPDM rubber roller sleeve. In particular, this utility model uses a POM plastic skeleton (note: the traditional skeleton is a metal skeleton), which significantly reduces the weight of the paper feed roller 1 (by about 40%), while giving the skeleton high strength and high rigidity, thus improving the running stability and printing quality of the paper feed roller 1.

[0039] (2) The paper feeding roller 1 of this utility model contains Pb (lead) and Cd (cadmium). Substances such as hexavalent chromium, mercury, polybrominated biphenyls (PBBs), and polybrominated diphenyl ethers (PBDEs) comply with RoHS requirements.

[0040] (3) This utility model uses high-precision CNC machining and electrical discharge machining (EDM) technology to manufacture toothed molds, realizing the manufacturing of toothed roller sleeves with high precision, high wear resistance and high stability. Among them, the toothed protrusions on the rubber roller sleeves effectively solve the problem of media slippage that is easy to occur in traditional paper feeding rollers.

[0041] This invention provides a high-precision, high-reliability, and long-life core component (i.e., paper feed roller 1) for inkjet printers, which has significant technological advancement and market competitiveness.

[0042] Other aspects of the paper feeding roller described in this utility model can be found in the prior art, and will not be repeated here.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A paper feeding roller, characterized in that, It includes a rubber roller sleeve and a frame. The outer ring surface of the rubber roller sleeve is provided with several protrusions. The rubber roller sleeve is disposed on the frame and is used to transfer paper.

2. The paper feeding roller according to claim 1, characterized in that, The rubber roller sleeve is an EPDM rubber roller sleeve.

3. A paper feeding roller according to claim 1, characterized in that, After the rubber roller sleeve and the skeleton are assembled, the connection between the rubber roller sleeve and the skeleton can withstand a torque of at least 3 kgf·cm.

4. A paper feeding roller according to claim 1, characterized in that, The protrusion is a tooth-shaped protrusion.

5. A paper feeding roller according to claim 4, characterized in that, The gap depth between two adjacent toothed protrusions is at least 0.26 mm.

6. A paper feeding roller according to claim 4, characterized in that, Based on the cross-section of the rubber roller sleeve, the angle between the center of the circle formed by the normal line of the midpoint of the flat end of one of the toothed protrusions and the normal line of the midpoint of the flat end of the adjacent toothed protrusion is at least 3°.

7. A paper feeding roller according to claim 1, characterized in that, The skeleton has a first axial cavity and a second axial cavity, and the first axial cavity is connected to the second axial cavity.

8. A paper feeding roller according to claim 7, characterized in that, The diameter of the cross-section of the second shaft cavity is larger than the diameter of the cross-section of the first shaft cavity.

9. A paper feed roller according to any one of claims 1 to 8, characterized in that, The skeleton can be either a plastic skeleton or a metal skeleton.

10. A paper feeding roller according to claim 9, characterized in that, The skeleton is a polyoxymethylene plastic skeleton.

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