TWI243755B - Method of picking up a paper - Google Patents

Abstract

A method of picking up a paper is suitable for a pick-up structure of a printer, a fax, a copier, or other printing apparatuses. The method includes the following steps: (1) rotating a pick-up roller and a position cam to obtain a larger gap than a paper-fixing gap between the pick-up roller and a tray; (2) moving the tray to a first pick-up position by the rotation of the position cam, wherein a paper is clipped between the tray and the pick-up roller; (3) forcing the paper moving along the direction of rotation of the pick-up roller until the pick-up roller comes back to the position where the paper-fixing gap is established.

Description

1243755 V. Description of the invention (1) The technical field to which the invention belongs The present invention relates to a paper picking method, and more particularly, to a paper picking method that prevents a document from rebounding. Laser printers and inkjet printers currently on the market with previous technologies stand out from many consumer electronics products, for reasons that include gradual price reduction and high-quality printing, making personal photos, color / The image of black and white documents is closer to real and vivid colors, and the high transmission speed interface (such as USB transmission interface) enables the printer to transmit at a higher speed when printing large-size and high-resolution. Faster, so users don't have to wait for the time consumed for data transmission, thus enhancing the efficiency of the printer. Whether it is a laser printer, inkjet printer, facsimile machine, MFP with fax, scanning, or other printing equipment, the design of the paper pickup mechanism is indispensable. The complicated paper picking mechanism drives the paper picking roller and other paper feeding or separating rollers by using a dual motor driving method or a multi-gear set driving method. Regardless of how the paper picking mechanism is driven, basically, the paper picking mechanism is mainly driven by the mutual movement between at least one paper picking roller and a positioning cam and a paper tray of the printing device to drive the paper. The paper or recordable medium moves along a paper feed path. Among them, when a printed document such as paper or a recordable medium is located in the paper feeding path, the pickup roller can force the above-mentioned printed document to move along the rotation direction of the pickup roller by means of rolling friction to complete one paper pickup Actions. FIG. 1 is a schematic diagram of a conventional paper-removing mechanism. Please refer to Figure 1,

13402TWF.PTD Page 5 1243755 V. Description of the invention (2) The paper pickup mechanism 100 mainly includes at least one paper pickup roller 1 10 and a positioning cam 120. The pickup roller 110 and the positioning cam 120 are sleeved on a rotating shaft 112, for example, and the rotating shaft 112 can be rotated by a motor (not shown) or a gear set (not shown). Among them, the paper picking roller 110 is, for example, a D type paper picking roller, and the arc surface is covered with a rubber 1 1 4 with a high coefficient of friction, so as to facilitate the driving of the file 10 or the other through the paper feeding path (as shown by the dotted line). Print a document, where the document was originally placed in Tray 1 3 0. It is worth noting that the purpose of the conventional setting of the paper pickup roller 1 10 is only to simply hold the document 10 so that the document 10 passes the paper pickup roller 1 1 0 and the paper tray 1 3 0. During the gap, the document 10 can be moved along the Wei paper path by the rolling friction of the paper picking roller 110. Therefore, it is known that when setting the position of the pickup roller 1 1 0, other purposes are not considered, but whether the file 10 can pass the clearance between the pickup roller 11 0 and the tray 1 3 0 is simply considered. If the gap is too small, the adjustment is larger, if the gap is too large, the adjustment is smaller, that's all. However, since the thickness of the document 10 is not significantly different (except for thick paper) and the axis position of the pickup roller 1 10 is unchanged, the original position of the pickup roller 1 1 0 and the paper feed before the pickup operation is performed A large fixed gap P (for example, greater than 5 mm) is kept between the boxes 130, as shown in Figure 1, but it also leaves the file 10 in an uncontrolled state unless a paper pressing mechanism (such as a certain Paper ring, not shown), to hold the holding document 10 at the position of the paper tray 130, but the assembly and cost of the pressing mechanism will increase, which obviously does not synthesize the benefit. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a paper taking method,

13402TWF.PTD Page 6 1243755 V. Description of the invention (3) Without the need for an external pressurizing paper mechanism, the paper, photos, or recordable media and other documents can be kept in a controlled state. Another object of the present invention is to provide a paper picking method, wherein when the paper picking roller completes the paper picking operation and returns to the original position, the paper, photos, or recordable media and other documents can be held between the paper picking roller and the paper tray. In the gap, other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention. In order to achieve one or part or all of the above objectives, the present invention proposes a paper pickup method, which is applicable to a paper pickup mechanism of a printing device, wherein the printing device has a paper tray. The paper picking mechanism includes at least one paper picking roller and a positioning cam, wherein the paper picking roller and the positioning cam are rotated by a rotating shaft, and defines a paper gap between the paper picking roller and the tray. The paper picking method of the present invention includes the following steps: (1) rotating the paper picking roller and the positioning cam so that the gap between the paper picking roller and the paper feeding tray is larger than the fixed paper gap; (2) making the paper feeding tray by positioning The rotation of the cam moves to the paper pickup position, where the document is clamped between the paper tray and the paper pickup roller; and (3) the document is forced to move in the rotation direction of the paper pickup roller until the paper pickup roller returns to the fixed paper Where the gap is. According to a preferred embodiment of the present invention, in the above step (1), the paper picking roller and the positioning cam are first rotated by a first angle from a fixed paper position, or a first angle by a position of a fixed paper gap, In order to make the document and the paper picking roller take off state, the first angle is less than 45 degrees. Next, in step (2), when the pickup roller and the positioning cam rotate to the first angle

13402TWF.PTD Page 7 1243755 V. Description of the invention (4) At the same time, the tray is moved to the pickup position, or the tray is moved to the pickup position only after the pickup roller and the positioning cam are rotated to the first angle. Paper position. Similarly, according to a preferred embodiment of the present invention, in the above step (3), the paper picking roller forces the document to move along the rotation direction of the paper picking roller, for example, by rolling friction or other driving methods to complete the paper picking. So far. The invention adopts a paper taking mechanism with both paper taking and fixed functions to achieve the paper taking action. Therefore, without the need for any additional paper pressing mechanism, a single paper pickup roller can achieve the effects of paper fixing and paper pickup, respectively, in order to properly maintain the retrieved documents in a controlled state. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings for detailed description as follows: For an implementation, please refer to FIG. A schematic flowchart of a paper pickup method according to a preferred embodiment of the present invention is applicable to a paper pickup mechanism. Figures 3 to 6 are schematic diagrams showing the action between the paper picking roller and the document when the paper picking method of the present invention is applied. As shown in FIG. 2, the paper picking method of the present invention mainly includes the following steps: Step 1 S 1 10, rotating the paper picking roller and the positioning cam, so that the gap between the paper picking roller and the input tray is larger than the fixed paper gap ; Step 2 S 1 2 0, the tray is moved to a paper pickup position, wherein the document is clamped between the tray and the pickup roller; and Step 3 S 1 3 0, forcing the document to follow

13402TWF.PTD Page 8 1243755 V. Description of the invention (5) The pickup roller moves in the direction of rotation until the pickup roller returns to the position where the gap between the paper is fixed. In step 1 S 1 10, the paper picking roller 2 1 0 and the positioning cam 2 2 0 are set on a rotating shaft 212, for example, and the rotating shaft 212 can be driven by a motor (not shown) or a gear set (not shown). ), As shown in Figure 3. It is worth noting that when the paper pickup mechanism 2 0 does not perform any paper pickup action (initial state), the paper pickup roller 2 1 0 and the positioning cam 2 2 0 are respectively at a certain paper position, and the paper pickup roller 2 1 The gap between 0 and the tray 2 3 0 is defined as the fixed paper gap P 1. In this embodiment, for example, a corner region 2 1 6 of a D-shaped pickup roller 2 1 0 is used to form a small gap P 1 between the pickup roller 2 1 0 and the paper tray 2 3 0. In particular, The preferred range of the gap P 1 is, for example, between 1.1 mm and 0.7 mm. If it is larger than 1.1mm, the document 20 is likely to be in an uncontrolled state, and if it is smaller than 0.7mm, it may easily affect the smoothness of the document when it is fed into the paper. Next, in step 1 S 1 10, when the pickup roller 2 1 0 starts to rotate from an initial position (ie, the document fixing position), as shown in FIG. 4, a first angle 0 is rotated. The gap P2 between the corner area 2 1 6 of the roller 2 1 0 and the tray 2 3 0 is widened by the paper pickup roller 2 0 being rotated by an angle. It is clearly found that the gap P 2 between the pickup roller 2 1 0 and the tray 2 3 0 in FIG. 4 is larger than the positioning gap P 1 between the pickup roller 2 1 0 and the tray 2 3 0 in FIG. 3, Therefore, the document 20 at this time is moved a distance by the paper pickup roller 210. Next, in step S120, the purpose of the positioning cam 220 is to hold the movable piece 232 of the tray 230 first, so that the document 20 placed on the movable piece 232 is in the untaken position first, such as Shown in Figure 3. Then, in the figure

13402TWF.PTD Page 9 1243755 V. Description of the invention (6) 4 When the positioning cam 220 and the pickup roller 210 rotate at the same time by a first angle 0, the movable piece 232 of the paper tray 230 passes the positioning cam 2 20 The circular movement moves to the first paper picking position, so that the document 20 can be close to the arc surface of the paper picking roller 2 10 to facilitate the paper picking action. In this embodiment, the paper pickup roller 2 1 0 and the positioning cam 2 2 0 are rotated, for example, 25 ° to 30 °, and then the movable piece 232 of the paper tray 230 is moved to the first paper pickup position in FIG. 4. . In addition, when the pickup roller 2 1 0 and the positioning cam 2 2 0 are rotated by 25 ° to 30 °, for example, the movable piece 2 3 2 of the tray 2 3 0 is also moved to the first paper pickup position in FIG. 4 at the same time. . Of course, the first angle 0 in this embodiment is not limited to 25 degrees to 30 degrees, and can reach a maximum of about 45 degrees. Next, in step S130, the arc surface of the paper pickup roller 210 is covered with, for example, a rubber 2 1 4 or other material with a high coefficient of friction, and the paper pickup roller 2 1 0 can drive the document 2 by rolling friction. 0 moves along the rotation direction of the paper picking roller 210 to perform the first paper picking action, as shown in FIG. 5, during the paper picking process, the arc surface of the paper picking roller 2 1 0 is opposite to the paper tray The gap between 2 3 0 remains substantially the same, and the document 20 is clamped between the pickup roller 210 and the tray 230. Next, in FIG. 6, after the paper pickup roller 2 1 0 and the positioning cam 2 2 0 complete the first paper pickup operation, they return to the fixed paper position, that is, the position of the fixed paper gap P 1 shown in FIG. 1. Therefore, in this embodiment, in addition to the paper picking roller 2 10 being able to complete the paper picking action, the document 20 can be positioned in the smaller gap P 1 to prevent the document 20 from rebounding. Therefore, by repeating the paper taking method of the above three steps of the present invention, the paper taking action of the second and third documents 2 2 can be completed continuously, and after each paper taking action is completed, the paper taking roller 2 1 0 and the fixed position 'Bit cam 2 2 0 returns to Figure 1

13402TWF.PTD Page 10 1243755 V. Fixing position of invention description (7). As can be seen from the above description, the paper picking mechanism of the present invention can not only achieve a series of paper picking actions, but also, after the paper picking action is completed, the document can be maintained between the paper picking roller 2 1 0 and the paper tray 2 3 0. Small gap P 1. Therefore, without the need for any additional paper pressing mechanism, a single paper pickup roller 2 10 can achieve the effect of paper fixing and paper pickup, respectively, in order to properly maintain the retrieved document 20 or paper in a controlled state. under. In summary, the paper picking method of the present invention is applicable to paper picking mechanisms such as printers, facsimiles, photocopiers, multifunction printers, or other printing equipment. The paper picking roller not only has both positioning and The function of taking paper is simple and practical. Therefore, the advantages of the paper picking method of the present invention can be summarized into the following three points: (1) After the paper picking roller is finished, its function can be regarded as a certain paper roller to keep the document under a controlled state. (2) The paper picking roller can still prevent the file from rebounding after the paper picking action is completed, so it will not affect the smoothness of file transmission. (3) The paper picking roller has both positioning and paper picking functions, so there is no need for an external pressurizing paper mechanism to position the document, thereby reducing the assembly and cost of the paper picking mechanism. It should be noted that the paper referred to in the present invention is not limited to a specific paper or a specific recording medium that can be printed. Any medium on which printing equipment can print text, graphics, or patterns Or the medium belongs to the paper referred to in the present invention, so the paper tray referred to in the present invention can also be referred to as a recordable media storage box, and the paper pickup roller can be referred to as a recordable

13402TWF.PTD Page 11 1243755 V. Description of the invention (8) The media pickup roller, the paper pickup mechanism can be referred to as a recordable media pickup mechanism, and so on; In addition, the aforementioned documents include any documents that can be printed Recordable media or media, whether or not there is text, graphics or patterns on it; in addition, the printing devices referred to in the present invention include printers, facsimile machines, photocopiers, multi-function printers or other devices with a paper pickup function machine. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes and retouch without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

13402TWF.PTD Page 12 1243755 Brief description of the drawings Figure 1 shows a schematic diagram of a conventional paper pickup mechanism. FIG. 2 is a schematic flowchart of a paper fetching method according to a preferred embodiment of the present invention. Figures 3 to 6 respectively illustrate the action of the paper picking roller and the document when the paper picking method of the present invention is applied. [Illustration of Graphical Symbols] 1 0 ^ 20, 22 ：: File 1 00 Paper pickup mechanism 1 10 Paper pickup roller 1 12 Rotary shaft 1 14 Rubber 120 Positioning cam 130 Paper tray 200 Paper pickup mechanism 210 Paper pickup roller 2 1 2 Rotary shaft 2 14 Rubber 216 Corner area 220 Positioning cam 230 Tray 232 Moving piece P, P1, P2: Clearance

13402TWF.PTD Page 13

Claims (1)

1243755 6. Scope of patent application 1. A paper picking method suitable for a printing device. The printing device has at least a paper picking mechanism and a paper tray. At least one recordable medium is placed on the paper tray. The paper picking mechanism includes at least one paper picking roller and a positioning cam, wherein the paper picking roller and the positioning cam are rotated by being driven by a rotating shaft, and defines a paper gap between the paper picking roller and the paper tray. The paper picking method includes the following steps: rotating the paper picking roller and the positioning cam so that the gap between the paper picking roller and the paper feeding tray is larger than the paper fixing gap; and making the paper feeding tray pass the positioning cam Rotate to move to a pickup position, where the recordable medium is clamped between the tray and the pickup roller, and the recordable medium is forced to move in the direction of rotation of the pickup roller until the pickup The paper roller returns to the position where the gap is set. 2. The paper picking method as described in item 1 of the scope of the patent application, wherein the paper picking roller and the positioning cam are first rotated by a first angle from the position of the paper gap, wherein the first angle is 45 degrees or less . 3. The paper picking method according to item 2 of the scope of the patent application, wherein the paper picking roller and the positioning cam rotate to the first angle while the paper feed tray moves to the paper picking position. 4. The paper picking method according to item 2 of the scope of patent application, wherein after the paper picking roller and the positioning cam are rotated to the first angle, the paper tray is moved to the paper picking position. 5. The paper picking method as described in item 2 of the scope of the patent application, wherein after the paper picking roller and the positioning cam rotate more than the first angle, the paper picking 13402TWF.PTD Page 14 1243755 VI. The gap between the patent application scope roller and the tray remains consistent until the paper picking operation is completed. 6. The paper picking method described in item 1 of the patent scope, The paper pickup roller forces the recordable medium to move in the rotation direction of the paper pickup roller by rolling friction. 7 · The paper pickup method is suitable for a printing device. The printing device has at least a paper pickup mechanism and a Paper tray j At least one recordable medium is placed on the paper tray j The paper pickup mechanism includes at least one paper pickup roller and a positioning cam wherein the paper pickup roller and the positioning cam are rotated by a rotation shaft When defining the paper picking roller in the first position, relative to the tray, there is a first gap j. The paper picking method includes the following steps: Rotating the pickup roller and the positioning cam from the first position to the second position, so that the recordable medium is substantially in contact with the pickup roller, rotating the pickup roller to make the recordable medium move along the rotation direction of the pickup roller, Until the paper picking roller returns to the first position, the recordable medium is restricted by the first gap and positioned on the paper tray. 8. The paper picking method described in item 7 of the patent scope, wherein the first -A gap ranges from 0 · 7 to 1.1 mm ° 9. The paper pickup method as described in item 1 of the patent scope, wherein the paper pickup roller forces the recordable medium to follow the roller by rolling friction. The rotation direction of the pickup roller moves. 13402TWF.PTD Page 15