CN1676446A - Paper feeding method - Google Patents

Abstract

A paper feeding method is applicable to a printer, a fax machine, a copier or other printing equipment. The paper feeding method of the present invention comprises the following steps: (1) a paper picking roller starts to rotate from an initial position so that a document passes through the gap between the paper picking roller and the paper feed tray; (2) the document moves along a paper feeding path and stops at the gap between the paper picking roller and the paper pressing roller; (3) the skew amount of the front end of the document is corrected until the paper picking roller returns to the initial position; and (4) the paper feeding roller is rotated in the reverse direction and the document is clamped between the paper feeding roller and the paper pressing roller to complete the paper feeding action.

Description

Paper feeding method

technical field

The present invention relates to a paper feeding method, and in particular to a paper feeding method for preventing document skew.

Background technique

Laser printers and inkjet printers currently on the market stand out from the crowd of consumer electronics products. The reason is that the price is gradually reduced, and they have high-quality printing effects, making the images of personal photos and color/black and white documents closer to reality. , bright colors, and through high-speed transmission interfaces (such as USB transmission interface), the printer can make the transmission speed faster when printing large-size and high-resolution printing, so that users do not have to wait for the time consumed by data transmission. time, thereby enhancing the efficiency of the printer.

Whether it is a laser printer, an inkjet printer, a fax machine, an office machine with functions such as faxing and scanning, or other printing equipment, the design of the paper-feeding mechanism and the paper-feeding mechanism is indispensable. The complicated paper picking/feeding mechanism, for example, drives the paper picking rollers and other paper feeding or paper separating rollers by means of dual-motor drive or multi-gear drive. Regardless of how the paper-feeding/feeding mechanism is driven, basically, the interior of the paper-feeding mechanism is mainly based on the mutual movement between at least one paper-feeding roller and a positioning cam and the paper tray of the printing device to drive Paper, documents or recordable media move along a paper feed path to the paper feed mechanism. Then, the document is clamped by a paper feeding roller and a paper pressing roller, forcing the document to move forward until a paper feeding/feeding action is completed.

1A to 1C are schematic diagrams of a known paper feeding method for preventing document skew. Please refer to FIG. 1A, as mentioned above, when the front end of the document 10 passes between the paper feed roller 102 and the paper platen roller 104, a sensor 106 is arranged near the paper output end of the paper feed mechanism 100 in the known technology to detect the document. 10 front end position, in order to avoid that file 10 skews. Then please refer to FIG. 1B , in conjunction with the sensor 106, the paper feed roller 102 and the platen roller 104 move the front end of the document 10 forward to a preset position, and the transmission mechanism (such as a motor or a gear set, not shown) forces the paper feed roller 102 rotates an angle in the opposite direction, at this time, the front end of the document 10 retreats between the feeding roller 102 and the pressing roller 104 to correct the amount of skew. Since the document 10 is bent (buckled) between the feed roller 102 and the pick-up roller 110 as a result of being pushed by the reverse force, for a document 10 with a relatively high stiffness (not easy to form a buckle), this kind of Design does not apply.

What is more noteworthy is that the known correction method to prevent document skew is not only time-consuming, but also the paper feed roller 102 must rotate counterclockwise and clockwise for a total of three times before outputting the document 10, as shown in FIG. 1C, causing the document 10 to stagnate in the correction It takes too long, affecting the overall transmission speed and fluency. In addition, due to the multiple rotations of the paper feed roller 102 , the control method of the transmission mechanism is relatively complicated, which easily damages the operation reliability and durability of the machine itself.

Contents of the invention

Therefore, the purpose of the present invention is to provide a paper feeding method that can reduce the amount of buckling of documents, so as to be suitable for various documents such as printed documents with high stiffness, faxes or copies.

Another object of the present invention is to provide a paper feeding method, which can shorten the time spent on document stagnation and correction, so as to increase the speed and fluency of document transmission.

Another object of the present invention is to provide a paper feeding method, wherein the control method of the paper feeding roller and the paper taking roller is simplified, so as to prolong the operation reliability and durability of the machine itself.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above objectives, the present invention proposes a paper feeding method for a printing device, wherein the printing device has at least one paper-feeding mechanism, a paper-feeding mechanism and a paper-feeding box, and the paper-feeding mechanism has at least one Pick-up roller and a positioning cam, and the paper feed mechanism has at least one feed roller and a corresponding pressure roller, wherein a document (or other recordable medium) is placed on the paper tray, and the document is kept on the pick-up roller in the gap between the tray and the tray. The paper feeding method of the present invention comprises the following steps: (1) the pick-up roller starts to rotate from an initial position (or the fixed paper position), so that the document passes through the gap between the pick-up roller and the paper tray; (2) The document moves along a feeding path, and stops the document at the gap between the feed roller and the platen roller; (3) corrects the skew of the front end of the document until the pickup roller returns to its original position; and (4) reverses the rotation Feed roller, and clamp the document between the feed roller and the pressure roller to complete the paper feeding action.

According to a preferred embodiment of the present invention, in the above step (1), the pick-up roller rotates by a first angle, for example, from a certain paper position or from an initial position, so that the document is separated from the pick-up roller. At the same time, the paper tray moves to a paper-fetching position just by rotating the positioning cam, or the paper-feeding cassette moves to a paper-picking position through the rotation of the positioning cam only after the paper-feeding roller rotates to the first angle. Next, in step (2), the pick-up roller forces the document to move along the paper feeding path, for example, by rolling friction, and when the document is blocked by the gap between the feed roller and the platen roller, the pick-up roller can continue to drive the document , and align the front end of the document to correct the skew at the front end of the document.

The present invention adopts a paper feeding method capable of correcting the skew amount of the document, so as to prevent the document from buckling, skewing, paper jamming, and the like during paper feeding. Therefore, printing documents such as paper and photos, or documents such as faxing and copying can be properly maintained in a controlled state to complete a series of paper feeding and feeding operations and maintain the smoothness of document transmission.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below, together with the accompanying drawings, and is described in detail as follows:

Description of drawings

1A to 1C are schematic diagrams of a known paper feeding method for preventing document skew.

Fig. 2 is a schematic flow chart of a paper feeding method in a preferred embodiment of the present invention.

3 to 6 are schematic diagrams of the action between the paper fetching roller and the paper feeding roller when the paper fetching method of the present invention is used.

10, 20, 22: Files

100: paper feeding mechanism

102: Feed roller

104: Platen Roller

106: sensor

110: paper pickup roller

200: paper picking mechanism

202: Feed Roller

204: Platen Roller

210: paper pickup roller

212: Shaft

214: rubber

216: Corner area

220: positioning cam

230: Tray

232: Activity film

P1, P2: Gap

Detailed ways

Please refer to FIG. 2 , which is a flowchart of a paper feeding method according to a preferred embodiment of the present invention. 3 to 6 are schematic diagrams of the action between the paper-feeding roller and the paper-feeding roller according to the paper feeding method of the present invention.

As shown in Figure 2, the paper picking method of the present invention mainly includes the following steps: step one S110, the paper picking roller starts to rotate from a certain paper position, so that the document passes through the gap between the paper picking roller and the paper tray; step two S120 , forcing the document to move along a paper feeding path, and preventing the document from being in the gap between the paper feed roller and the pressure roller; Step 3 S130, correcting the skew of the front end of the document until the paper pickup roller returns to the fixed paper position; and Step 4 S140, reversely rotate the paper feed roller, and clamp the document between the paper feed roller and the pressing roller, until the paper feeding action is completed.

In step 1 S110, the paper pickup roller 210 and the positioning cam 220 are sleeved on a rotating shaft 212, for example, and the rotating shaft 212 can be driven to rotate by a motor (not shown) or a gear set (not shown), as shown in FIG. 3 Show. When the paper-feeding mechanism 200 does not perform any paper-feeding action (initial state), the paper-feeding roller 210 and the positioning cam 220 are respectively at certain paper positions, and the purpose of the paper-feeding roller 210 is to drive the document 20 through the In addition to the gap between the paper trays 230 , the document 20 can be kept in a small gap P1 between the pickup roller 210 and the paper tray 230 to achieve the purpose of positioning the document 20 . In this embodiment, for example, the corner area 216 of a D-shaped pick-up roller 210 is used to form a small gap P1 between the pick-up roller 210 and the paper tray 230, especially the gap P1 is enough for the document 20 to maintain under control.

Next, in step one S110, when the pick-up roller 210 starts to rotate from an initial position (ie, the document positioning position), it rotates a first angle θ as shown in FIG. It is separated from the surface of the document 20 (as shown in FIG. 4 ), and the gap P2 between the pickup roller 210 and the paper tray 230 is widened due to the rotation of the pickup roller 210 by an angle. It is obvious that the gap P2 between the pickup roller 210 and the paper tray 230 in FIG. 4 is greater than the positioning gap P1 between the pickup roller 210 and the tray 230 in FIG. 3 . In FIG. 4, when the positioning cam 220 and the paper pickup roller 210 rotate at a first angle θ at the same time, the movable piece 232 of the paper tray 230 moves relatively to the first paper pickup position through the circular motion of the positioning cam 220, Or the pick-up roller 210 and the positioning cam 220 first rotate to the first angle, and then the movable piece 232 of the paper tray 230 moves to the first paper pick-up position in FIG. 4 , so that the document 20 can be close to the pick-up roller 210 The arc surface is convenient for taking paper.

Next, in step 2 S120, the arc surface of the pick-up roller 210 is covered with a rubber 214 or other materials with a high coefficient of friction, for example, so that the pick-up roller 210 can force the document 20 to move along a paper feed through rolling friction. Path movement, as shown in FIG. 5 , wherein during the feeding process, the arcuate surface of the pick roller 210 is substantially consistent with the gap between the tray 230, and the document 20 is still clamped to the pick roller. 210 and the paper tray 230 until the paper pickup roller 210 returns to the fixed paper position, as shown in FIG. 6 .

It should be noted that in step 2, the front end of the document 20 does not pass between the feed roller 202 and the platen roller 204 as shown in the known FIG. 1A , but is blocked by the feed roller 202 and the platen roller 204 The paper-feeding end of the paper-feeding end is as follows: the paper-feeding roller 202, for example, first rotates against the forward direction of the document 20 (in this embodiment, the paper-feeding roller 202 rotates clockwise), so that the front end of the document 20 is subjected to a counterclockwise rotation. At this time, the pick-up roller 210 continues to hold the document 20 and moves towards the feed roller 202, so that the document 20 is in the process of feeding the document, and the correction of the skew of the document 20 in step 3 is performed at the same time. To trim the front end of the document 20 until the paper pickup roller 210 stops and returns to the fixed paper position, as shown in FIG. 6 .

Next, in step 4 S140, the paper feed roller 202 rotates in the opposite direction (in this embodiment, the paper feed roller 202 rotates counterclockwise), that is, rotates along the direction in which the document 20 advances, so as to hold the document 20 and pass the paper feed between the roller 202 and the platen roller 204 until the first paper feeding action is completed. Therefore, repeat the paper feeding method of above-mentioned four steps of the present invention, then can finish the document 22 paper feeding actions such as the second time, the 3rd time continuously, and carry out paper feeding action every time while, all can be fast to the front end of document 20. The amount of skew is corrected to prevent the document 20 from being skewed, buckled, or paper jammed, thereby improving the transmission speed and fluency of the document 20 . In addition, in this embodiment, it is not necessary to use a known sensor (not shown) to detect whether the front end of the document 20 is too skewed.

As can be seen from the above description, the present invention uses a paper feeding method capable of correcting the skew of the document to prevent the document 20 from buckling, skewing, and paper jamming during paper feeding. Therefore, printed documents such as papers and photos, or various documents such as faxes and copies, even documents with high stiffness, can be applied to the paper feeding method of the present invention because the amount of buckling of the present invention is relatively small. The document 20 can be properly maintained in a controlled state, and a series of paper picking and feeding actions can be completed. In addition, each time a paper feeding action is performed, the paper feeding roller 202 only needs to rotate clockwise or counterclockwise once, so the operation method of the paper feeding roller 202 and the paper picking roller 210 can be simplified, and the life of the machine itself can be extended. Operational reliability and durability.

In summary, the paper feeding method of the present invention is applicable to paper fetching/feeding mechanisms such as printers, facsimile machines, copiers, multifunctional office machines or other printing equipment, especially in the process of document feeding, which can be carried out simultaneously. Correction of the skew amount of the document. Therefore, the advantage of paper feeding method of the present invention can be summarized as following three points:

(1) The paper feeding method of the present invention can reduce the amount of buckling of documents, so it is suitable for various documents such as printed documents with high stiffness, faxes or copies.

(2) During the document feeding process, the document skew can be corrected at the same time, so the document transmission speed and fluency can be improved.

(3) The paper feeding method of the present invention can simplify the control mode of the paper feeding roller and the paper taking roller, so the operation reliability and durability of the machine itself can be extended.

It should be noted that the paper referred to in the present invention is not limited to specific paper or a specific recordable medium available for printing. Any medium or medium (such as film) on which text, graphics or patterns can be printed belongs to this category. The paper defined in the invention, so the paper tray referred to in the present invention can also be called a recordable medium storage box, the paper-taking roller can be called a recordable medium pick-up roller, and the paper-fetching mechanism can be called a recordable medium pick-up mechanism, The paper feeding mechanism may be referred to as a recordable medium delivery mechanism, and so on; in addition, the above-mentioned documents include any recordable medium or medium that can be printed, regardless of whether there are words, graphics or patterns on it; in addition, this The printing equipment referred to in the invention includes printers, facsimile machines, copiers, multifunction machines or other machines with the function of feeding paper (delivering recordable media).

Claims (13)

1. A paper feeding method, which is applicable to a printing device, the printing device has at least a paper-feeding mechanism, a paper-feeding mechanism and a paper tray, the paper-feeding mechanism has at least one paper-feeding roller and a positioning cam, and The paper feed mechanism has at least one paper feed roller and a corresponding pressure roller, wherein a recordable medium is placed on the paper tray, and it is characterized in that the paper feed method includes the following steps: The paper pickup roller starts to rotate from a certain paper position, so that the recordable medium passes through the gap between the paper pickup roller and the paper tray; forcing the recordable medium to move along a feed path and preventing the recordable medium from being in the gap between the feed roller and the platen roller; Correcting the skew amount of the front end of the recordable medium until the pickup roller returns to the fixed paper position; and Reversely rotate the paper feed roller, and clamp the recordable medium between the paper feed roller and the platen roller, until the paper feed action is completed. 2 . The paper feeding method according to claim 1 , wherein the paper pickup roller rotates at a first angle from the fixed paper position, so that the recordable medium is separated from the paper pickup roller. 3 . 3. The paper feeding method according to claim 2, wherein when the paper picking roller rotates to the first angle, it further includes rotating the positioning cam to move the paper feeding tray to a paper picking position. Location. 4. The paper feeding method according to claim 2, wherein after the paper picking roller rotates to the first angle, it further comprises rotating the positioning cam to move the paper tray to a paper picking position . 5. The paper feeding method according to claim 2, wherein when the paper pickup roller is at the fixed paper position, there is a certain paper gap relative to the paper tray, and when the paper pickup roller rotates to At the first angle, the gap between the paper pickup roller relative to the paper tray is greater than the paper fixing gap. 6. The paper feeding method according to claim 2, wherein after the paper picking roller rotates greater than the first angle, the gap between the paper picking roller relative to the paper tray remains substantially consistent until the taking The paper roller returns to the fixed paper position. 7. The paper feeding method as claimed in claim 1, wherein the paper pickup roller forces the recordable medium to move along the paper feeding path by rolling friction. 8. The paper feeding method according to claim 1, wherein when the recordable medium is blocked between the paper feed roller and the platen roller, the paper pickup roller continues to drive the recordable medium, and cuts the recordable medium evenly. the front end of the recordable medium to correct the skew of the front end of the recordable medium. 9. A paper feeding method, suitable for a printing device, the printing device has at least a paper-feeding mechanism, a paper-feeding mechanism and a paper-feeding box, the paper-feeding mechanism has at least one paper-feeding roller and a positioning cam, and The paper feed mechanism has at least one paper feed roller and a corresponding pressure roller, wherein a recordable medium is placed on the paper tray, and it is characterized in that the paper feed method includes the following steps: The paper-feeding roller starts to rotate from an initial position, so that the recording medium passes through the gap between the paper-feeding roller and the tray, and stops at the gap between the paper-feeding roller and the platen roller; Correcting the skew of the front end of the recordable medium until the pickup roller returns to the initial position; and Reversely rotate the feeding roller to make the recordable medium pass between the conveying roller and the pressure roller to complete the conveying action. 10 . The paper feeding method as claimed in claim 9 , wherein the paper pickup roller rotates at a first angle from the initial position, so that the recordable medium is separated from the paper pickup roller. 11 . 11. The paper feeding method according to claim 10, wherein when the paper picking roller rotates to the first angle, it further comprises rotating the positioning cam to move the paper tray to a paper picking position. Location. 12. The paper feeding method as claimed in claim 9, wherein the paper pickup roller forces the recordable medium to move along the paper feeding path by rolling friction. 13. The paper feeding method according to claim 9, wherein when the recordable medium is blocked by the gap between the paper feed roller and the platen roller, the paper pick-up roller continues to drive the recordable medium, and cuts the recordable medium evenly. the front end of the recordable medium to correct the skew of the front end of the recordable medium.

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