TW467831B - Sheet feeder - Google Patents

Abstract

An automatic document feeding device has a document feeding roller which feeds a document from a stack to a conveying roller which conveys the document for further processing. The document feeding roller has intermittent motion which feeds the conveying roller with three different speeds: first, at a first speed for feeding the document; then, at a speed faster than the first speed as dragged by the document; and finally, a temporary stop. The temporary stop provides sufficient interspace between the successive documents so that a correct pagination signal is generated. The intermittent motion is provided by a power transmitting component which is coupled to the document feeding roller to speed it up when engaged and is decoupled during the stop interval.

Description

467 83 A7 B7 V. Description of Invention 6) This case is the second application of the patent application No. 85103916. Field of the Invention The present invention relates to an automatic document feeding device, and in particular, a device capable of correctly triggering the generation of a paging signal during the automatic document feeding process. Background Description Automatic document feeding devices are used in fax machines, image scanners, and photocopiers to input images of documents. These sheets of documents with images can be fed into the image reading device one by one by a "paper feeding" machine for reading. The present invention is a design of an automatic "paper feeding" machine. Figure 1 is the basic structure of an automatic feeding machine, which contains a document feeding roller 1 and a baffle 3. The baffle plate 3 is pressed against the document feeding roller 1 by a pressure spring 3b, and a stack of documents 7 is stacked above the document feeding roller 1. As shown in Figure 1, the automatic document feeding device, in which the friction number iUR of the document feeding roller 1 is greater than the friction number of the friction baffle by Pd, and the friction number of the friction baffle is greater than the friction of the document by Pd. Count WP, which is jU R > Pd > p. When the document feeding roller 1 starts to rotate, the bottom document 7ii # in the document stack is fed into the system by the operation of the document feeding roller 1 and the baffle 3, because iU R > / i ρ Off. Since iU Pd > / i Ρ is closed, only the bottom one of file 7 can be sent out and fed into the system. The other file pages will be blocked by the lotus of baffle 3 and stay. In the original position. Therefore, the stacked documents can be fed by the document feeding roller 1 to the transmission wave wheel 9 one by one. The pagination sensor 8 has a sensing arm 8a. When the trailing edge of a page of document 705 passes through the sensing arm 8a, and the front end of a subsequent page of document pages has not touched the sensing arm *, the sensing arm 8a can be driven by gravity or spring The force is turned on downwards, so the switch for activating the paging signal (not shown in the figure) sends a paging signal.

Page 2 I ^ Install-(Please read the note on the back before filling out this page.) ... Ί ^ .t ----- 4 —----- T --------- --- l ·-1. ip This paper size applies to Chinese national standards (CNS > A4 size (210X297 mm) 4 6 7 .8 3 1 H3 Printed by the Staff Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs According to the art, after the trailing edge of a page of documents passes through the sensor arm Sa, if the subsequent pages of the document continue to be sent, if there is not enough space between the front and back pages to allow the sensor hall arm 8a to open downwards, The problem of paging cannot occur. In order to solve this problem, the traditional technique uses the electric clutch 1G. The electric clutch 10 is located between the power transmission element 4 and the axle 2 ^, as shown in Figure 2. When the front end of file 7 passes After the induction arm 8a is partly and driven by the transmission roller 9, it starts an opening to close the electric clutch 10, causing the axle 2 and the power transmission element 4 to be separated. At this time, the document feeding roll-in 1 and the power transmission element are passed to the " "Floating position" [floating position]. The entry roller 1 will be dragged by the file 7, and the file 7 will be moved forward by the transmission roller 9. When the end of the file 7½ passes the induction arm 8a, the induction arm 8a will start a switch to open the electric clutch 10, causing the wheel axle 2 is engaged with the power transmission element 4. At this time, the document feeding roller 1 is driven by the power transmission element 4½ to feed the second page of documents into the system. In the aforementioned conventional technique, the electric clutch 10 occupies With a lot of space, its outer diameter is usually larger than 25 mm. Because of this, the automatic technique of the know-how can not be made smaller, and the price of the electric clutch 10 is quite expensive. The technology of the invention means that it is not necessary to use the electric clutch 10, so that it can not only reduce the volume of the whole system, but also reduce the production cost of the whole system. One of the purposes of the technology of the present invention is to provide an automatic document feeding. Loading device, which is in the process of document feeding, and can correctly generate a paging signal. Another purpose of the technology of the present invention is to provide an automatic document feeding device with a small volume. Another purpose of the technique of the present invention is to provide an automatic document feeding device at an affordable price. An automatic document feeding device includes a document feeding roll-off, which either stacks documents or puts them in a paper tray. The document is fed to the transmission roller in the system one by one, and the transmission roller then transfers the file to a place for further processing. The peripheral speed of the aforementioned document feeding roller is smaller than the peripheral speed of the aforementioned transmitting roller. The rotation of the aforementioned document feeding roller is driven by the power transmission element coupled to it. When the transmission roller has not been opened to transmit the file, the power transmission element drives the document feeding roller to rotate at a first speed; when transmitting When the wheel starts transferring files, the file feeds

Page 3 This paper size is applicable to China National Welding Standard (CNS) A4 (210X297 mm)

4 67 831 H3 3 The input roller is dragged by the document, so that the document feeding roller rotates at a speed greater than the first speed; when the trailing edge of the document leaves the document feeding roller, the document feeding roller stops rotating. For a short time. This stop rotation for a short time, resulting in a gap between the front and back pages of the fed document, this distance can make the system generate the correct paging signal. This is achieved through the invention of the invention through the blocking element on the power-transmitting element and the coupling element on the coupling element on the rotating shaft of the document feeding roller. It is not necessary to use a conventional electric clutch here. Correct paging function. Brief description of the ball type Figure 1. Basic schematic diagram of the automatic feeding device. Figure 2. The structure of the automatic feeding device of the conventional art. FIG. 3 is one of the embodiments of the automatic feeding device of the technology of the present invention. — Figure 4. The first implementation of the power transmission system of the present invention. Figure 5 is a cross-section view between the gong element and the power transmission element in Figure 4, showing the situation where the document feeding roller is driven to rotate by the power transmission element. 26. It is a cross-section between the coupling element and the power transmission element in FIG. 4, showing the situation where the document is fed and rolled and dragged and rotated by the document. Figure 7. It is between the folding element and the power transmission element in FIG. A cross-sectional view of the document feeding roller temporarily stops rotating after the trailing edge of the document leaves the document feeding roller. FIG. 8 is an exploded view of the coupling element and the power transmission element in FIG. 4. 8A is a modified embodiment of FIG. 8, and FIG. 8B is another modified embodiment of FIG. 8. FIG. 9 is an exploded view of another embodiment between the coupling element and the power transmission element of FIG. 4. Printed by the Staff Welfare Committee of the Central Bureau of Standards of the Ministry of Economic Affairs. Figures 10A, 10B, and 10C are another example of the invention. Fig. 11A, Fig. 11B are the schematic diagrams of the stopping angles produced in lotus cultivation in Fig. 10A, Fig. 10B, and Fig. 10C. . Fig. 12A and Fig. 12B are another embodiment of the present invention. Illustrating the preferred embodiment of the technology of the present invention Figure ^ shows the first embodiment of the automatic document feeding device of the technology of the present invention. In the figure, the components with the same function as those shown in Figure 1 and Figure 2 are assigned the same number To facilitate the reader's understanding of reading. Figure 3 shows the automatic

Page 4 The paper's strength standards are in accordance with the Chinese National Standard (CNS> A4 size (2I0X297) -16 7 8 3 1 H3 4 The file feed device contains a file feed roller 1 with a shaft 2 and a file The plate 3 and a power transmission element 4: The power transmission element 4 is connected to a power source (not shown in the figure) for driving the rotation of the document feeding roller 1. In this embodiment, the rotation shaft 2 It is a single unit integrated with the document feeding roller 1. With reference to Figure 1, the baffle 3 is mounted on the document hovering wheel 1 with the axis 3a as the rotation axis, and is pushed by a pressure spring. Push against the document feeding roller 1. A power transmission element 4 is installed on the rotating shaft 2 'and rotates in the direction shown by the three arrows. An E-shaped retaining ring (not shown in the figure) is located on the rotating shaft 2 to The power transmission element 4 is installed on the rotating shaft 2 'and plays the role of a shaft nut in this embodiment. A coupling element 5 is installed on the rotating shaft 2. The coupling element 5 ^ E is a pin-like shape in this embodiment. Object. When the power transmission element 4 is shown by the three arrows in FIG. When rotating in the direction shown, if the blocking element on the power transmission element 4 is engaged with the coupling element 5, so, the torque of the power transmission element 4 is obtained. It is transmitted to the document feeding roller 1, and the document feeding roller is driven. 1. Rotate it. Refer to Figures 5, 6, and 7. When the lotus is made, the document feeding roller 1 is driven to rotate in the direction shown by the arrow in Figure 3. With the cooperation of the baffle 3, 7 pages of the document can be rotated. Feed out one page, feed document 7 into the transmission roller 9 ° When the front end of the document 7 is held by the transmission roller 9, the moving speed of the file 7 is equal to the peripheral speed of the transmission roller 9, and the peripheral speed of the transmission roller 9 is greater than Peripheral speed of the document feed roller 1: At this time, the peripheral connection of the document feed roller 1 will exceed the peripheral speed given by the power transmission element 4, so the coupling element 5 will move forward and leave the power transmission The blocking element 4a on the element 4 differs by an angle Θ, see FIG. 60. The monthly meeting of the 8th Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs prints the phase difference angle β shown in FIG. 6 as the document 7 continues to drag Add t until the text Until the trailing edge of 7 leaves the document feeding roller 1, as shown in Figure 7, the phase difference angle formed by it is represented by Θ d. When the trailing edge of document 7 leaves the document feeding roller 1, the document The feeding roller 1 will temporarily stop rotating. This is because the torque of the power transmission element 4 at this moment cannot be transmitted to the rotating shaft 2, that is, it cannot be transmitted to the file feeding roller 1. This is because the phase difference angle δ »d 鼯At this time, the next page of files will temporarily stop at the original position and will not be fed into the system.

Page 5 This paper is applicable to the national standard (CNS) A4 specification (210 X 297). 4'6'7 83 1 H3 Printed by the Shell Welfare Committee of the Bureau of Standards, Ministry of Economic Affairs and Standards: «However, because the power transmission element 4 The power transmission element 4 rotates sickly even though the document feeding roller 1 is temporarily stopped. When the blocking element 4a located above the power transmission element 4 is rotated by the angle d, it will engage the coupling element 5 again, so the document feeding roller 1 starts to rotate again, and continues to feed the document 7 into the transmission roller 9. The process from Figure 5 to Figure 7 is repeated until all files are transferred. FIG. 8 shows an embodiment of the power transmission system of the present invention, which is a design of the coupling element 5. The coupling element 5 on the rotation axis surface of the load-feeding feed roll 1 adopts the design of a plug-like object 5. FIG. 8A is a modified embodiment of FIG. 8, which shows that the blocking element 4 a can be retracted into the transmission element 4, so that the size of the entire system can be reduced and material can be saved: FIG. 8B is another variation of FIG. 1. For example, this embodiment illustrates that the blocking element 4a can be designed so that two fe can perform similar functions, and the mechanism of power transmission is more uniform. Fig. 9 shows another embodiment of the power transmission system of the present invention, which is a modified design of the coupling element 5. The coupling element 5 on the surface of the rotary shaft 2 ± of the feeding roller 1 for carrying the document adopts the design of the bush 5a instead of the plug-like object 5. As mentioned above, when the document feeding roller 1 stops rotating, the document 7 is being transmitted by the transport roller 9. This results in a distance △ &amp; between the previous and next page files. The distance Δds can be calculated by the following formula: △ ds = / r D Θ d where D is the diameter of the document feeding roller 1; &lt; 9 is the relative stopping angle between the power transmission element 4 and the cooker element 5 as shown in Figure VII. The following is an example of calculating Ads and relative stopping angles <9 d. For the sake of convenience, first assume that the file hung roller 1 and the transmission roller 9 have the same angular velocity *. That is to say, the time for the two rotations is the same. Tr, its peripheral speed is exactly proportional to the diameter of the roller. Assuming that the diameter of the document feeding roller 1 and the transmission roller 9 are 15.5mm and 16.2mm, it is obvious that the peripheral speed of the transmission roller 9 will be

Page 6 This paper uses China National Standard (CNS) A4 (210X297)

467831 H3 Printed by the Staff Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs. After the Tr time elapses, the document feed roller 1 advances document 7 by dl: dl = Dl * / r = 15.5 ^ 3.14 = 48.7 (mm) where D1 is the diameter of document feed infeed 1. Once file 7 is struggling with the transmission roller, within the same time Tr, the distance traveled by file 7 is d2: d2 = Ό2 * ιτ = 16.2 * 3.14 = 50.9 (mm) where D2 is the diameter of the transmission roller 9. -Φ △ d = d2-dl = 2.2 (mm) where. △ d is when the document 7 is held by the transfer roller 9 and the document feeding roller 1 at the same time, after the Tr time, the document feeding roller 1 is forwarded Drag distance. Now take the most commonly used A4 paper with a length of 297 mm as an example. * When document 7 leaves the document feeding roller 1, the dragged distance is: Δ ds = [(297- D3) / d2] * A d = [ (297-40) /50.9] * 2.2 = 11.1 (nun) where '《$ D3 The distance between the ring transmission roller 9 and the document feeding roller 1, here it is assumed to be 40 mm. Is the distance of the angle by which the document feeding roller 1 rotates Θ d. In other words, when the first page and the second page are fed into the system by the document feeding roller 1, Ads is the distance between the trailing edge of the first page and the leading edge of the second page. According to practical experience, the distance sufficient to generate the correct paging signal is 5 mm. Therefore, the distance distance calculated by the previous example is reliable enough to provide a system for paging signals. The resulting relative stopping angle Θ d can be calculated as follows:

Paee7 This paper size applies to China National Standard (CNS) A4 (2 丨 0 X 297 cm) 467831

The Ministry of Economy and Technology of the Central Committee of the Ministry of Economic Affairs of the People's Republic of China / Beijing Welfare Association / :. India 7 9 d = {Ads / (Γ Ό1) * 360 ° = 82 ° According to this embodiment * the relative stopping angle Θ d can be fed into the roller 1 through a file The diameter and the speed difference between the two sets of rollers are calculated. A third embodiment of the technique of the present invention is shown in FIGS. 10A, 10B, and 10C. One end of the rotating shaft 2 carrying the document feeding roller 1 has a flat surface 2a. The power transmission element 4 has a V-shaped opening, and It is arranged at one end of the rotating shaft 2 which carries the document feeding roller 1. When the power transmission element 4 rotates, the side 4b of the V-shaped opening will mesh with the surface 2a of the rotating shaft 2. * See Figure 11A. At this time, the torque can be transmitted to the document feeding roller 1, and the document feeding The roller 1 and the power transmission element 4 rotate in the same direction, and the document 7 can be fed into the system. During lotus production, the document feeding roller 1 rotates in the direction of the arrow. With the cooperation of the baffle 3, the stacked documents 7 can be separated page by page, and the feeding bar is transmitted to the transmission roller 9. $ When the document feeding roller 1 separates the stacked document 7—page by page, and the feeding system sends it to the transmission roller 9, the transmission roller 9 will hold the document 7 forward at the peripheral speed, and the transmission roller The peripheral speed of 9 is greater than the peripheral speed of the document feeding roller 1, so that the rotation speed of the document feeding roller 1 is greater than the rotation speed of the power transmission element 4. At this time, the surface 2a of the rotating shaft 2 will be separated from the Y-shaped surface 4b of the power transmission element 4. When the trailing edge of the document 7 leaves the document feeding roller 1, the relative angle will stay at &lt; 9 d * such as As shown in FIG. 11B, at this time, the document feeding roller 1 is suspended from rotating. As described above, until the Ads distance is generated, the document feeding wheel 1 will be rotated and fed again. Figures 12A and 12B show another embodiment of the opening of the power transmission element 4. This design is such that the opening of the power transmission element 4 is a beam surface opening instead of a V-shaped opening. 'When the power transmission element 4 rotates in the direction of the arrow, one side of the opening of the power transmission element 4 will mesh with the surface 2a of the rotating shaft 2 (as shown in Fig. 12A), so that the torque can be transmitted to the file feeding The roller 1 drives the document feeding roller 1 to rotate, and the rest of the operations are the same as those in the third embodiment. __ Page 8 This paper size is in accordance with Chinese National Standard (CNS) A4 (210X297 mm) H3 8 According to the previous description, you can learn that the automatic cultural and residential pedaling device of the present invention is simpler than the conventional technique. Mechanism design, and can generate the correct paging signal. The foregoing description shows the green embodiments and design drawings of the present invention, but the * best embodiments and design drawings are only examples, and are not intended to limit the scope of the right to the technology of the present invention. Those who implement the technology of the present invention, or those who implement within the scope of the rights covered by the "Scope of Patent Application" described below, do not depart from the spirit of the present invention and are the scope of the applicant's rights.

Page 9 The size of this paper applies to the Chinese national standard (CNS) A4 specification (210X297 mm) "Repair-4 6 7 Sg1 | 3916A〇1 The description of the revised code on February 6th of the year 1 Document feeding roller 2 Axle 2a Plane 3 Baffle 3a Axle 3b Pressure Spring 4 Power Transmission Element 4a Blocking Element 4b Surface 5 Coupling Element 5a Bushing 7 File 8 Paging Sensor 8a Induction Arm 9 Transmission Roller 10 Electric Clutch Ministry of Economy 4- Central Standard Bureau Staff The paper size printed by the Welfare Committee applies the Chinese National Standard (CNS) A4 (210x 297 mm)

Claims (1)

4 67 83sA 03916A01 'February 6th, 1990, λ correction, patent application scope 1. Yiling document feeding roller, feeding the aforementioned documents page by page: One transmission roller, transmitting via the aforementioned document feeding roller The aforementioned document transmitted; wherein, the aforementioned document feeding roller operates intermittently: during the transmission of the aforementioned transmitting roller, the aforementioned document feeding roller includes: a first speed, which is a speed ratio The speed of the aforementioned transmission roller is slow; a second speed, which is faster than the first speed; a third speed, which is zero; so that during the feeding of the aforementioned document, the aforementioned document is fed The relative speed of the input roller may vary; a wheel shaft for carrying the aforementioned document feeding roller, and driving the aforementioned document feeding roller to rotate by a power transmission element, and having the aforementioned first speed; and a coupling The element &gt; is mounted on the aforementioned wheel shaft so as to transmit a torque generated by the aforementioned power transmitting element on the transmission roller Before the document, it is transmitted to the aforementioned document feeding roller, which is characterized by: The above-mentioned coupling element printed by the Employee Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs is located within the aforementioned power decision element: and the aforementioned power transmission element includes an inner Shrinking bumps to transmit power to the aforementioned coupling element. 2.— 瘇 _ The document is locked into the roller, and the aforementioned documents are used one by one: one transfer roller, which is transmitted by the aforementioned document feeding roller. The paper size applies to the Chinese National Standard (CNS) A4 specification ( 210x 297 mm) A8 4 6 7 83 1 85103916A01 February 6, 1990 Amendment of the aforementioned documents in the scope of patent application; among them, the aforementioned document feeding roller operates in intermittent feeding mode; in the aforementioned transmission During the transmission of the roller, the aforementioned document feeding roller includes: a first speed, which is slower than the speed of the aforementioned transmission roller; a second speed, which is faster than the aforementioned first speed: a third Speed, this speed is zero; so that during the feeding of the aforementioned document, the relative speed of the aforementioned document feeding roller will change; an axle, which is used to carry the aforementioned document feeding roller, and is transmitted by a power The component drives the aforementioned document feeding roller to rotate and has the aforementioned first speed; and a coupling element, which is mounted on the aforementioned axle to A torque generated by the power transmission element of the front wheel is fed to the wheel before the transmission of the file by the transmission wheel, which is characterized by the aforementioned i. The coupling element is located within the aforementioned power transmission element ; The power transmission element described above includes two inner 1 bumps to transmit the power to the aforementioned coupling element. Printed by the Beiwei Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs This paper size is applicable to the Chinese national standard (CNS) A4 (210 x 297 mm)