TWI251541B - Sheet separating mechanism of an auto document feeder - Google Patents

Abstract

A sheet separating mechanism of an auto document feeder includes an auto document feeding (ADF) roller, two separating rollers, and a pressing element. An assembly is formed by the pressing element assembled between in the two separating roller, and the separating rollers and the pressing element both contact with the ADF roller. A sheet is being fed by the assembly and the ADF roller feed a sheet, where the separating rollers provide a friction force for separating sheets and the pressing element press on the surface of the sheet. Therefore, the sheet is being fed in smoothly with the problem of jamming eliminated.

Description

1251541 V. INSTRUCTION DESCRIPTION (i) Technical Field of the Invention The present invention relates to a paper separation mechanism which is assembled in an automatic paper feeder of an image input/output device, and in which the paper separation mechanism Under the influence of the paper, the plurality of sheets can be separated one by one and enter the inside of the automatic paper feeder. [Prior Art] A main component of an automatic paper feeder includes a paper separator located at the paper feed end, and a plurality of roller sets positioned inside the paper feeder. The plurality of rollers are opposed to the separation mechanism, so that a sheet of paper is separated from the plurality of sheets of the paper cassette by the separation mechanism, and is moved forward by the plurality of roller groups. A paper feed mechanism includes an automatic paper feed roller (Auto Document

Feeding Roller, ADF Roller) and a friction pad (Pad). One surface of the friction pad is in contact with the automatic paper feed roller, and one end of the plurality of paper is interposed therebetween. With the automatic paper feed roller rolling and the friction between the friction pad and the paper, the multiple sheets can be separated and moved forward one by one. The corresponding positions of the friction pad and the automatic paper feed roller are different, and the paper feed order of the multiple papers is different. For example, if the friction pad is on the upper side of the automatic paper feed roller, the plurality of papers are fed one by one from bottom to top; the friction pad is located below the automatic paper feed roller, and the plurality of papers are fed one by one from top to bottom. Please refer to the first figure, taking the friction pad 1 1 position above the automatic paper feed roller 1 2 as an example. The friction pad 11 is not combined with various pressing elements, so that the automatic paper feed roller 12 cannot be biased, so that the paper 13 will undergo a crushing bulge (j a m m i n ) 14 when it advances. ^ US Patent No. 5,5 7 3,3 3 8 proposes a solution to the paper bulge

Page 6 1251541 V. Inventions (2) Law. The method proposed in the patent is to provide a shrapnel on both sides and in the middle of the friction pad. Although the use of three elastic sheets to press the paper can prevent the paper from rising, the elastic sheets and the friction pads must be assembled and fixed in order to be assembled in the separation mechanism, so that the structure of the separation mechanism is more complicated and inconvenient to install. SUMMARY OF THE INVENTION One object of the present invention is to provide a paper separator mechanism for an automatic paper feeder that provides a pressing force on the surface of the paper so that the paper does not swell. The second object of the present invention is to provide a paper separator of an automatic paper feeder, which has the advantages of a simpler structure. According to the above, the paper separation mechanism disclosed in the present invention comprises a separation roller, a pressing element (pressing e 1 e m e n t ), and an automatic paper feed roller (A D F r ◦丨1 e r ). The separation roller is disposed in the same axial direction as the pressing member assembly, and the assembly is opposed to the automatic paper feed roller. At the time of paper feeding, the paper passes between the assembly and the automatic paper feed roller, and is pressed by the pressing member, so that the paper does not have a bulging condition. The paper separation roller of the present invention replaces the conventional friction pad, and the paper separation roller can be driven by the automatic paper feed roller. The pressing member may be a member pressed against the surface of the paper by its own weight or its own elastic force, and includes a roller, a sponge material, or a shrapnel or the like. '[Embodiment], please refer to the second figure, which discloses a paper separator designed by the present invention.

Page 7 1251541 V. Inventive Description (3) Structure comprising an automatic paper feed roller 20, a two-way paper roller 30 and a pressing member 40. A shaft 2 2 is disposed in the axial direction of the automatic paper feed roller 20 . The shaft 2 2 is coupled to a power unit for driving the automatic paper feed roller 20 to rotate. The axial direction of the separation roller 30 is threaded through the same shaft 3 2, and the separation roller 30 is separated. Further, the surface of the separation roller 30 may be in contact with the automatic paper feed roller 20. The pressing member 40 is disposed between the separation rollers 30. The shaft 3 2 passes through the pressing member 40. Please refer to the third A diagram, which shows the structure of the A-A section. The pressing element 40 is a roller which is defined as a picking roller (p i c k u p r ο 1 1 e r ), 42. The picking roller 4 2 opens a uniform perforation 4 4 for the shaft 3 2 to pass through. It is to be noted that the diameter of the through hole 44 is larger than the outer diameter of the rotating shaft 32, so the drawing roller 4 2 rests on the surface of the automatic paper feeding roller 20 by its own weight. When the rotating shaft 3 2 is rotated, the drawing roller 4 2 can be appropriately swung or rotated by the contact frictional force with the rotating shaft 32. At this time, the take-up roller 4 2 rotates asynchronously with the rotating shaft 32. The paper separation roller 30, the drawing roller 4 2 and the automatic paper feeding roller 20 of the present invention may be made of rubber material or made of a metal material to draw the roller 42 ° - see the third B diagram, in the figure Show another structure of the AA profile. The inner surface of the through hole 44 of the roller 4 2 is provided with a tooth pattern 45, and the surface of the shaft 3 2 is also provided with a tooth pattern 3 3 . When the inner surface of the through hole 44 is in contact with the surface of the rotating shaft 32, the contact grooves 3 3, 4 5 are engaged with each other, so that the rotation of the rotating shaft 32 can simultaneously drive the 16 picking roller 42 to rotate. The above situation can be achieved by the fact that the contact faces of the inner surface of the through hole 44 and the rotating shaft 32 are sufficient for frictional force, in addition to the mutual engagement of the teeth 33, 45. Sufficient friction, including the use of roughness

Page 8 1251541 V. INSTRUCTIONS (4) Achieved by means of face or biting or material change. Please refer to the fourth figure, which shows the state before the paper is fed by the present invention. The paper 1 4 is positioned between the separation roller 3 0 and the take-up roller 4 2 . The sheet 14 is in contact with the separation roller 30, the pickup roller 4 2, and the automatic paper feed roller 20. Please refer to the fifth figure, which shows the process of feeding the paper of the present invention. The paper 1 4 is moved forward by the automatic paper feed roller 20. At this time, the separation roller 3 0 and the pickup roller 4 2 are pressed against the surface of the paper 14, so that the surface of the paper 14 can be surely prevented from being raised. It is worth noting that since the diameter of the through hole 4 4 of the drawing roller 4 2 is significantly larger than the shaft diameter of the rotating shaft 32, the drawing roller 4 2 is movably sleeved on the 4 rotating shaft 3 2 . When the paper 14 moves forward, the pickup roller 4 2 still rests on the surface of the paper 14 with its own weight, and the moving paper 14 will drive the pickup roller 4 2 to shift. Regardless of the relative movement of the automatic paper feed roller 20 and the take-up roller 4 2, the offset pickup roller 4 2 and the automatic paper feed roller 20 are more displaced. The technique employed in the present invention differs from the prior art patent technology in that it does not have a relative displacement between the shrapnel of the previously disclosed U.S. patent and the automatic paper feed roller. - Please refer to the sixth figure, which discloses that the pressing member 40 is a sponge sleeve 46. The sponge sleeve 46 has a restoring force which is pressed by an external force and is reversely expanded. In the design of the present invention, the sponge sleeve 46 can be fixed to the rotating shaft 32, and the surface of the sponge sleeve 46 is in contact with the surface of the automatic paper feed roller 20. During the paper feeding process, the surface of the paper 10 sheets 14 is pressed by the separation roller 30 and the sponge sleeve 46, so that the surface does not "rise". In this embodiment, the sponge cover 46 and the automatic paper feed roller 20 can be rotated.

Page 9 1251541 V. Description of the invention (5) According to the structural configuration that the sponge sleeve 46 and the automatic paper feed roller 20 are rotatable, please refer to the seventh figure, and a ring brush 4 7 is set on the shaft 3 2 . . The bristles of the ring brush 47 can smooth the surface of the paper 14. The surface of the sponge cover 46 and the bristles of the annular brush 47 are soft structures, so that the outer surface of the pressing member 40 has a soft portion 53 as defined herein. Referring to the eighth drawing, the pressing member 40 of the present invention may be a pressed sheet _48. One end of the pressing piece 48 is sleeved on the shaft 3 2, and the other end 51 is placed on the surface of the automatic paper feed roller 20. It is to be noted that one end of the pressed piece 3 2 is movable and nested on the rotating shaft 3 2 , so that during the paper feeding process, the movement of the paper 14 can drive the end 1 5 of the pressing piece 4 8 to move. The present invention mainly uses a rolling separation roller 30 to replace a conventional friction pad which does not generate a moving state, and at the same time, a pressing member 40 is placed on a rotating shaft 3 2 which passes through the separation roller 30. The pressing member 40 may not rotate with the rotating shaft 32, but the pressing member 40 and the automatic paper feed roller 20 may be relatively displaced, thereby being firmly pressed against the surface of the paper 14. The pressing member 40 can also be rotated with the rotating shaft 32, and the rotating pressing member 4 is pressed against the surface of the paper 14 by a soft surface. - The structure disclosed in the present invention has the following advantages: 1. Regardless of the form of the component to which the pressing member 40 belongs, it can surely provide a stable or soft pressing force in the direction of the automatic paper feed roller 20, In addition, the separation roller 30 is pressed against the surface of the paper 14 so that the hair can clearly provide a stable pressing force to the paper 14 during the paper feeding process, so that the paper 14 can smoothly enter. Inside the paper separation mechanism. 2. Whether the pressing element 40 is a roller, or a sponge sleeve, or a brush, or

Page 10 1251541

Page 11 1251541 Schematic description of the description [F1] single figure description The first picture is the appearance of the conventional friction pad and automatic paper feed roller configuration. The second drawing is an appearance view of the present invention. The third A is a schematic view of the cross-sectional structure of the A-A of the present invention. The third B is a schematic view of another structure of the A-A section of the present invention. The fourth figure is a schematic view of the state before the automatic paper feeding of the present invention. The fifth drawing is a schematic view of the automatic paper feeding state of the present invention. The sixth figure is a schematic view of the structure of the sponge member of the present invention. The seventh figure is a schematic view showing the structure of the pressing member of the present invention. The eighth embodiment of the present invention is not intended to be a pressed sheet structure. Φ [Main component symbol description] 1 1 friction pad 1 2 automatic paper feed roller 1 3 paper 1 4 ridge 2 0 automatic paper feed roller - 2 2 shaft 3 0 paper roller 3 2 shaft 4 0 pressing element • 4 2 Roller '44 through hole. 4 6 sponge cover

Page 12 1251541 Schematic description

Claims (1)

1251541 VI. Patent application scope 1. A paper-feeding mechanism of an automatic paper feeder is set at the paper feeding end of the automatic paper feeder for separating the plurality of papers one by one and conveying each paper to the interior of the automatic paper feeder The method includes: an automatic paper feed roller; at least two paper rollers, disposed on a side of the automatic paper feed roller opposite to the automatic paper feed roller, and the surface of the paper separation roller and the surface of the automatic paper feed roller Contacting; a pressing component, which is assembled between the two-folding roller, the pressing component is brought into contact with the automatic paper feeding roller by its own weight; in the paper feeding process, the paper separating roller and the automatic paper feeding roller Rotating, ¥ and the pressing member and the separating paper roller are pressed against the surface of the paper. 2. The paper separating mechanism of the automatic paper feeder according to claim 1, wherein the pressing member does not rotate synchronously with the paper dividing roller. 3. The paper separating mechanism of the automatic paper feeder according to claim 1, wherein the pressing member rotates synchronously with the paper dividing roller. 4. The paper separating mechanism of the automatic paper feeder according to claim 3, wherein a rotating shaft penetrates the separating paper roller and the pressing member, wherein the pressing member is in contact with the rotating shaft to be sufficient to drive the pressing The friction of the component rotation. 5. The separating mechanism of the automatic paper feeder of claim 4, wherein the indented engagement of the pressing member with the rotating shaft generates a frictional force sufficient to drive the pressing member to rotate. 6. The paper separator structure of the automatic paper feeder according to claim 4, wherein the pressing member and the rotating shaft are in contact with each other by a rough surface to generate a foot. Page 14 1251541 VI. Patent application range The frictional force that drives the pressing element to rotate. 7. The separating mechanism of the automatic paper feeder according to claim 4, wherein the contact position of the pressing member with the rotating shaft is made of a material having a large coefficient of friction to generate a frictional force sufficient to drive the pressing member to rotate. 8. The paper separating mechanism of the automatic paper feeder according to claim 1, wherein a rotating shaft passes through the pressing member and the separating paper roller, wherein the pressing member is a drawing roller, and the perforating is opened in The axis of the picking roller is oriented, and the diameter of the through hole is larger than the shaft diameter of the rotating shaft. 9. The paper machine of the automatic paper feeder according to claim 1, wherein a rotating shaft passes through the pressing member and the separating paper roller, wherein the pressure component is a pressed sheet, and the pressing member One end of the pressing piece is movably sleeved on the rotating shaft, and the other end is placed on the surface of the automatic paper feeding roller by its own weight. A paper separating mechanism of an automatic paper feeder is disposed at a paper feeding end of the automatic paper feeder for separating the plurality of papers one by one, and conveying each paper to the inside of the automatic paper feeder, comprising: An automatic paper feed roller; at least two paper rollers are disposed on one side of the automatic paper feed roller, corresponding to the automatic paper feed roller, and the surfaces of the paper feed rollers and the surface of the automatic paper feed roller are in contact with each other; a pressing component is assembled between the two-division roller and synchronously rotates with the separating roller, the pressing component has a soft portion for contacting the surface of the self-feeding roller; 'in the automatic feeding process The paper separation roller, the pressing member and the self-propelled paper feed roller are both rotated, and the pressing member is pressed against the paper separation roller Page 15 1251541 VI. Scope of application The surface of the paper. 1 1 . The paper separating mechanism of the automatic paper feeder according to claim 1 , wherein a rotating shaft passes through the pressing member and the separating paper roller, wherein the pressing member is a sponge sleeve. The sleeve is placed on the distal shaft. 1 . The paper separating mechanism of the automatic paper feeder according to claim 1 , wherein the surface of the sponge cover is defined as the soft portion. 1 . The paper separating mechanism of the automatic paper feeder according to claim 1 , wherein a rotating shaft passes through the pressing member and the separating paper roller, wherein the pressing member is a ring brush. The sleeve is fixedly mounted on the shaft and the surface is provided with protruding bristles. Φ 1 4, The paper separating mechanism of the automatic paper feeder according to claim 13 wherein the bristles are defined as the soft portion. Page 16