TWI220413B - A sheet-feeding apparatus - Google Patents

Abstract

A sheet-feeding apparatus. The sheet-feeding apparatus comprises a shaft, a sheet-feeding arm and an elastic member. The sheet-feeding arm has a passive surface and rotates around the shaft. The elastic member has a driving surface contacting the passive surface at a first point and exerts a first torque to the shaft when the sheet-feeding arm at a first position. When the sheet-feeding arm is at a second position, the elastic member exerts a second torque to the shaft by the driving surface contacting the passive surface at a second point, wherein the first torque probably equals to the second torque.

Description

1220413 V. Description of the invention (1) The technical field to which the invention belongs: The present invention relates to-a kind of paper feeding step for a variety of different thicknesses of paper = = in-a kind of paper feeding device of the prior art. Please refer to FIG. 1, which is a schematic diagram of a conventional paper feeding device 10 which is suitable for a business machine and a Bayesian device. This (f_QUer) 12, a plurality of =-a pickup roller 16,-a pickup arm 18, a paper feed slot 22, and a burr 14-rotation axis = 1 ": rS1 SPring). Among them, the pickup arm 18 can be wound around The paper is located in the paper feed slot 22, and the elastic member 26 = the paper picking arm 18 applies a positive pressure to the paper to facilitate the movement of the paper. Figures 2a and 3a are respectively The side view of the aforementioned paper feeding device 1 when the paper is empty and full is shown, and the X 2b and 3b diagrams respectively show the state of the elastic element 26 being deformed when the paper is empty and full. Among them, the aforementioned elastic element 2 The wheat shape of 6 depends on the angle change of the paper picking arm 1 8 with respect to the paper feed slot 2 2 'and when the paper feed slot 2 2 is in a full paper state compared to the empty paper state, the force of the elastic element 2 6 The degree is larger, and at the same time has a larger amount of deformation. As shown in Figures 2b and 3b, when the paper is empty, the paper picking roller 2 is in contact with the paper feed slot 22, and the elastic member 26 is at an angle at this time. α, relative to the full paper state, when the arm 188 is taken to be supported, the elastic element 26 has a larger angle point, where < β. As described above, when set When the elastic member different from the thicker sheet 26 due to the degree of torsion, acting on the pickup larger force on the arm 18, i.e., results in a greater positive pressure on the pickup carry sheets. '

0535-10183TWF (Nl); A03132; TKLIN.ptd Page 5 1220413 V. Description of the invention (2) —- However, 'when only a very small amount of paper is placed on the paper feed slot 22, the elastic member το 26 has only a small effect The force is on the paper picking arm 丨 8, the paper picking roller 丨 2 forward driving force applied to the paper on the paper feed slot 22 is relatively small, so it is easy to cause a "miss-feed" condition. Conversely, when a large amount of paper is placed on the paper feed slot 22, a large force is exerted on the paper pickup arm 18 by the elastic element 26 to cause the paper pickup roller 12 to apply the paper on the paper feed slot 22 The forward driving force is so large that it causes multiple paper feeds (mu 11 i-feed) in Gu Yi.

Please refer to FIG. 4, which shows the unintended forward driving force required to extract papers of different thicknesses 20 2, 20 4, 206, 20 8, 210 with a conventional paper feeding device. Figure 4 shows five different papers at the same time. Among them, the thickest paper 2 02 is used as an example. The pickup roller 12 must apply a forward drive of 12 to 70 grams to force a single paper to be picked successfully. Although the force exerted by the paper pick-up roller 12 is less than 12 grams, a situation in which the paper cannot be picked up (m 丨 ss ^ eed) will be generated. In contrast, if the force applied by the paper pick-up roller 12 is greater than 70 grams, It will cause a multi-feed situation.

In FIG. 4, it is assumed that the paper pick-up roller 12 of the conventional paper feeding device 10 will apply a positive driving force of 10 to 30 grams to the paper 20 according to the degree of deformation of the elastic π member 26 (such as As shown by the oblique line region R), when the forward driving force applied to the paper 202 by the pickup roller 丨 2 is between 10 grams and 12 grams, a situation of unreachable, oblique, and negative conditions will occur (ie, the oblique region R It overlaps with the oblique line area A.) I. Take the thin paper 2J0 as an example. The take-up roller 12 must be applied with 3 to 25 grams: the driving force can be used to successfully pick up a single sheet of paper. 12 will apply 1 to the paper 21 according to the degree of deformation of the elastic member 26.

1220413 V. Description of the invention (3) ---- Forward driving force of 30 g, so when the pickup roller 12 applies a positive driving force of ^ to the paper 21 0 between 25 g and 30 g, A situation in which multiple sheets of paper are generated (that is, the overlapping portion of the diagonal region R and the diagonal region β). To sum up, in Figure 4, because the paper pickup roller 丨 2 exerts a wide range of forward driving force (10 ~ 30 g) on the paper, it can only target paper, 2 (Η, 206, 2 08 Feed a single sheet of paper normally. Conversely, if paper 202 or 210 is used, the above-mentioned problems of inability to take out paper or multiple take-up papers may occur. Also, in order to avoid the occurrence of the above-mentioned paper feeding problems, it is common practice The paper device 10 can only be used to feed the aforementioned papers 2 04, 206, and 208, which is inconvenient for users who often use different types and different thicknesses of paper. Hanging like content:

The main object of the present invention is to provide a paper feeding device, which includes a rotating shaft, a paper picking arm, and an elastic element. The aforementioned paper picking arm rotates around a rotation axis and has a passive contact surface. The elastic element has an active contact surface. When the paper picking arm is in a first position, the active contact surface and the passive contact surface contact one of the first contact points in the space. At this time, the elastic element acts a stem moment to the rotation axis. The paper picking arm is located at the first piece: the U passive contact surface is in contact with a second contact point in the space. At this time, the elastic element applies a second moment to the rotating shaft, wherein the first moment and the second moment are approximately equal to ϋ. The invention can provide the paper picking roller to apply a stable driving force to the paper, which can avoid the change of the feeding force due to different paper thicknesses and multi-recruitment, so that it can be used to feed a variety of papers of different thicknesses, improving the use of

〇535-l〇183TW (Nl); A03132; TKLIN.ptd

1220413 V. Description of the invention (4) Convenience. However, in order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is exemplified below, and a detailed description is given below in conjunction with the accompanying drawings. Embodiment: First embodiment Please refer to FIG. 5 first, which shows the schematic diagram of the paper feeding device of the present invention. As shown in the figure, the paper feeding device of the present invention can be applied to a clerk machine, a sweeper and a bomb and has a fixed end 3 1-a torsion spring fixed end 3 1 series mandrel 5 1 is otherwise, such as The surface C b shown in the figure is rotated by a slider such as the printing arm 1 8, 51, 26, and 32, around the middle sheet. The special surface Ca, the moving contact point C, the scanner, etc. 'mainly include a rotation axis 3 3, a pick-up element 2 6; among which, the paper picking arm 18 can rotate around the rotation axis 3 3 and the contact part 6 6, The elastic element 26 has a central axis and an extending portion 32. In this embodiment, the elastic element spring (torsoinal spring). The above-mentioned central shaft 51 is fixed to the paper feed slot 22 as shown in FIG. 1, and the extension part rotates. The paper feed slot 22 is used to place the paper to be fed. In the present invention, the extension part 32 has an active contact. , The active contact surface Ca is in contact with one of the spaces in a passive contact manner with the contact portion 66

The amount of angular deformation of the elastic element 26 depends on the shape of the paper 18 and the paper feed slot 22 due to the different thickness of the paper. In the present example, the elastic element 2β can provide a contact force F acting on the contact point C, and the t-axis 33 generates a force illusion. "The magnitude of the above-mentioned moment τ depends on;

1220413 V. Description of the invention (5) The force F and the distance from the contact point C to the rotation axis 33. The main purpose of the present invention is to provide a stable torque T so that the forward driving force P applied to the paper by the pickup roller 12 is kept consistent. Therefore, by designing appropriate contact surfaces Ca and Cb, the spring 26 can be Arbitrary contact position produces a stable moment T to the rotating shaft 33. Among them, since the length of the arm of the paper pickup roller 12 to the rotating shaft 33 is fixed, the paper pickup roller 12 can provide a stable forward driving of the paper. Force P. Please refer to Figs. 6a, 6b, and 6c, where Figs. 6a, 6b, and 6c respectively show the elastic element 26 at different angles α 1, α 2 and α 3 (where α 1 > α 2 > α 3) In the state where different contact forces FI, F2, and F3 are respectively applied to the aforementioned contact portions 66, the paper picking arms 18 are in the first, second, and third positions, respectively. Among them, the forces F1 < F2 < F3 generated by the elastic element 26 under different conditions α 1 > α2 > α3 respectively. In Fig. 6a, the central axis 5 1 and a fixed end 3 1 of the elastic element 26 are fixed to the paper feed trough 2 2 as shown in Fig. 1. The extension 32 of the elastic element 26 has a The active contact surface Ca 'and the passive contact surface Cb of the contact portion 66 contact the contact point C1 in the space; since the paper is opened in the paper feed slot to open the paper take-out arm 18, it is at an inclined angle / 5 1; At this time, the elastic element 26 is compressed by the force to form a cool angle αΐ, and generates a spring force F1 to act on the contact portion 66 on the paper picking arm 18. As shown in Fig. 6a, the force F 1 acting on the contact point generates a moment for the rotation and rotation shaft 33 of the paper picking arm 18, and the effective arm length perpendicular to the F1 direction at this time is dl, and the rotation axis 33 Torque T1 = F Bu dl. In the same way, the elastic element 26 is shown in FIG.

0535-10183TWF (Nl); A03132; TKLIN.ptd Page 9 1220413 V. State of the invention (6) when the paper is thicker. At this time, the paper picking arm 1 8 is stretched by the paper to form an inclined angle / 3 2, and the elastic element 2 6 has an included angle α 2 ′ due to the compression by force, where α 1 > α 2. In addition, the elastic element 2 6 generates a spring force F 2 on the contact portion 66 on the paper picking arm 18. As shown in Figure 6b, the force F2 acting on the contact point C2 in space generates a moment 'for the rotation axis 33 in the paper picking arm 18 and has an effective force arm length d2 perpendicular to the direction of F2. At this time, the rotation Torque on shaft 33 T2 = F2 · d2. Please refer to Fig. 6c again. In the same way, Fig. 6c shows the situation when the elastic element 26 is placed in a thicker paper than in the previous 6b. At this time, the paper picking arm 18 is extended to an inclined angle. / 5 3, and the elastic element 26 has an included angle α3 due to the compression with force, where α1 > α2 > α3. In addition, the elastic member 26 generates a spring force F3 to act on the contact portion 66 on the pickup arm 18. As shown in Fig. 6c, the force F3 acting on the contact point C3 in the space generates a moment for the rotating shaft 33 in the paper picking arm 18, and has an effective force arm length d3 perpendicular to the j? 3 direction. Torque T3 on shaft 33 = F3 · d3. The above three cases respectively represent the cases where the torsion angles αΐ, α2, and α3 formed by the elastic element 26 under different force states are different, in which α1> α 2 > α 3, and call 1 < / 3 2 < / 3 3. In addition, the elastic elements 26 and the contact portions 66 respectively generate forces FI, F2, and F3 at different contact points ci, C2, and C3 in space, where F1 < F2 < F3. Since it is known that when the elastic element 26 forms different loss angles αΐ, α2, and α3, the corresponding spring forces FI, F2, and F3 are also known values, so the present invention can calculate the elastic element 26 and the contact portion 6 in advance 6 contact surface, so that they form the corresponding effective arm length dl, d2, d3, and can meet T = T1 = F1 · dl = T2 = F2 · d2

1220413 V. Description of the invention (7) = T3 = F3 · d3 = ... Erding! Where τn is a certain value. Please refer to the figure again. By the above-mentioned elastic element 26 being in contact with the contact portion 66, a torque T can be transmitted through the rotating shaft 33 and the paper pickup arm 18, so that the paper pickup roller 12 generates a stable forward direction on the paper. The force 'wherein by appropriately adjusting the active and passive contact surfaces ^ and ⑶'s contours at different contact positions, the elastic element 2 6 can generate a stable moment to the rotating shaft 3 3', that is, T = Τ 1 = F 1 * dl = T2 = F2 · d2 = T3 = F3 · d 3 = ··· = Tn, where Tn is a certain value. In this way, the present invention provides a spring force through the elastic element 26, and can generate a stable torque value at different contact positions with the contact portion 66, so that φ can obtain the paper pickup roller 1 below the paper pickup arm 18. 2 Applying a stable positive force to the paper can not only effectively avoid the situation that the paper feeding device can't apply force to the paper and the paper is unable to take (miss-feed) or multi-feed (multi-feed). Further improving the efficiency of paper feeding, it can be widely applied to a wider variety of papers and different thicknesses. Please refer to FIG. 7 ', which is the second intention of the forward driving force required by the paper feeding device of the present invention to retrieve papers 302, 3 04, 306, 3 08, and 310 of different densities. In Fig. 7, five papers of different thicknesses are shown. The thick paper 3 2 of Bonda is taken as an example. When 12 to 70 g of forward paper is applied + to obtain a single paper 3 smoothly. 0 2. In addition, for the most example, when a forward driving force of 3 to 25 grams is applied, 1 / | s of a sheet of paper 31 may also be used. Successfully picking the order As shown in Figure 7, when the paper feeding device of the present invention is full of paper, the wheel 12 applies a positive driving force of 20 grams to the paper to remove ,, and thicken the paper device.

1220413 In the description of the fifth invention (8), the pickup roller 12 applies a 15 g forward driving force to the paper. Therefore, the present invention can be applied to a variety of papers of different thicknesses. The condition of the paper (multi_feed) is 0. If the force of the contact surface is stable, the paper can be connected to the paper and the shaft 3 3 is not passively connected. Then, another Cb and Ca can be obtained. Its surface. Secondly, the contours, moments, and ranges can be provided in the same thickness. In the same thickness, the normal paper element 2 6 on the contact surface Cb can be calculated to generate a fixed moment. First define one of the contact surfaces. For example, in the moment limit bar, the active contact surface Ca is used to compensate for the torsion spring to make it significantly smaller. A stable pair of elastic paper rollers 12 is designed to make a single sheet of active contact compared to the conventional driving force. It is designed especially when the surface is empty, and then the contact is used to define the elastic or passive contact changes. Therefore, the paper feeding device 10 can act on the paper. The surface Ca is in contact with the main component C 6 of the passive component 2 6 of the portion 6 6 which is subjected to a fixed moment in the interposition. A paper arm 1 8 can provide a forward drive. More types of the invention 6 6 At the time of the contact, the rotation is restricted to the limiting conditions. The contact surface, the moving contact surface, or the curved surface <1 is a combination of the elastic element 26 and a contact member 7 named Gan Yishi ^ κ ^ 1 ', Fu Yi / combined. Among them, the elastic element 2 6

The extension 3 2 is fixed to the above-mentioned contact member 7y Μ ^ Q n 1 '* and the extension 32 is in contact with the contact member i: The cover member 7 rotates about a central axis 71 together, and the Fu Zhongyin contact structure / 〒 contact member 7 series through the central axis

1220413 V. Description of the invention (9) 71 is pivotally connected to the paper feed slot 22 as shown in Fig. I. In particular, the contact member 7 has a guide groove 70 therein, and in addition, a passive contact surface at the end of the paper pickup arm 18. The dagger system can be moved in the guide groove 70 and contact the active contact surface (^, contact.) Of the surface of the guide groove. Therefore, when a paper of different thickness is placed in the paper feed slot to open the paper take-up arm '1 8 o' The elastic element 26 will form different torsions, t angles α 1, α2, and α3 under different stress states (as shown in Figures 8a, 8b, and 8c). As mentioned earlier, the present invention can actively contact by design The surface C a 'and the corresponding contour of the passive contact surface Cb' generate a consistent moment on the rotating shaft 33 under different attitudes, that is, T1 = T2 = T3, where the active contact surface Ca is passively connected to the corresponding contact surface. Cb is calculated to be a plane or a curved surface. Third embodiment "Please refer to Figs. 9a, 9b, and 9c again. The present invention can also connect the above-mentioned contact member 7 with a guide groove to a spring 8, in which the contact The member 7 is pivotally connected to the paper feed slot 22 as shown in the figure through the central axis 71, and the spring 8 is connected to the paper feed slot 22 and the contact member 7. In particular, the contact member 7 has an inner guide = a guide The slot 70, and the passive contact surface ⑶ located at one end of the paper picking arm 18 can move inside the slot 70 and be in contact with the guide slot 70. The active contact surface Ca, contact. Because =, when the paper feed slot is filled with paper of different thickness, the paper take-up arm 18 is stretched. The elastic element 26 will be in different attitudes 9a, 9b and 9c under different stress conditions. (Shown in the figure). Because the spring 8 generates different tensile spring forces due to different degrees of different degrees in different attitudes, through the present invention, the active contact surface Ca and the contour of the corresponding passive contact surface ⑶ can be set, and In the state, the spring force of the spring 8 is stable and consistent with the rotating shaft 33. The same = even if Π = Τ2 = Τ3, in which the main disc hammer product Γ., Also μ +? ^ The active contact surface Ca and the corresponding passive contact

1220413 V. Description of the invention (10) _________ The surface Cb is calculated and can be taken as an example. This embodiment is for reading, or a curved surface. ”Unlike the previous two implementations of the active chucking in the chute 70, kwuhuangli provided a The stable moment, Fuzhongqian touches Ca, and the year-old 俶 b τ b can also pass through the aforementioned moment, the passive contact surface at the end of 孑 18—the stable positive driving force, and can be determined by In order to apply the hair to the paper, although it is disclosed in the action of taking paper in a preferred embodiment. 2 The scope of j. Anyone who is familiar with this technique, but it is not used to limit the scope of :, the god of the moon and the scope of 'what can be done a little more:' Retouching, so defined by the cabinet of the present invention shall prevail. ❸ &lt; 1

0535-10183TWF (Nl); A03132; TKLIN.ptd Page 14 1220413 Brief description of the drawings Figure 1 shows a schematic diagram of a conventional paper feeding device; Figure 2a shows the conventional paper feeding device in empty Figure 2b is a side view of the elastic element of the conventional paper feeding device in empty paper in FIG. 1; FIG. 3a is a side view of the conventional paper feeding device in full paper in FIG. 1 Figure 3b is a schematic diagram of the elastic element of the conventional paper feeding device when the paper is full in Figure 1; Figure 4 is a forward driving force required by the conventional paper feeding device in Figure 1 to retrieve paper of different thicknesses Fig. 5 is a schematic diagram of a paper feeding device of the present invention; Figs. 6a, 6b, and 6c are unintentional views of an elastic element exerting a force on a contact portion in different states, and Fig. 6d is an illustration of an elastic element pair in the present invention. A schematic diagram of a rotating shaft applying a stable moment; FIG. 7 is a schematic diagram showing a driving force required by the paper feeding device of the present invention to retrieve papers of different thicknesses; FIGs. 8a, 8b, and 8c represent a second implementation of the present invention Schematic diagram of examples; Figures 9a, 9b, 9c show the invention A schematic diagram of the third embodiment. Explanation of symbols: 1 0 ~ paper feeding device 0535-10183W (Nl); A03132; TKLIN.ptd page 15i 1220413 simple illustration of the drawing 1 2 ~ paper pickup roller 1 4 ~ separator 1 6 ~ paper pickup shaft 1 8 ~ Paper picking arm 20 2, 204, 206 &gt; 20 8 '210 ~ paper 2 2 ~ paper feed slot 2 6 ~ elastic element 30 2,3 0 4,3 0 6,3 0 8,3 1 0 ~ paper 3 1 ~ Fixed end 3 2 ~ Extended part 3 3 ~ Rotary shaft 5 1 ~ Central shaft 6 6 ~ Contact part 7 ~ Contact member 70 ~ Guide groove 7 1 ~ Central shaft 8 ~ Bouncing 8 1 ~ Fixed end P ~ Forward drive Forces F, F1, F2, and F3 ~ Force force A ~ Unable to take out area B ~ Multiple take-out area R ~ Forward driving force range T, T1, T2, T3 ~ Moment

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Claims (1)

1220413 6. Scope of patent application 1. A paper feeding device, comprising: a rotating shaft; a paper taking arm rotating around the rotating shaft, having a passive contact surface; an elastic element having an active contact surface, when the paper is taken When the arm is in a first position, the active contact surface and the passive contact surface are in contact with a first contact point in space. At this time, the elastic element applies a first moment to the rotary shaft. In the second position, the active contact surface and the passive contact surface are in contact with a second contact point in space. At this time, the elastic element applies a second moment to the rotating shaft, wherein the first moment and the second moment Approximately equal. 2. The paper feeding device described in item 1 of the patent application scope, wherein the paper picking arm further has a paper picking roller, which contacts a paper and applies force to the paper by the first moment. 3. The paper feeding device described in item 2 of the patent application scope further includes a paper feeding slot, wherein the paper is located in the paper feeding slot. 4. The paper feeding device according to item 3 of the patent application scope, wherein the elastic element is fixedly connected to the paper feeding slot. 5. The paper feeding device according to item 1 of the patent application scope, wherein the elastic element is a torsion spring. 6. The paper feeding device according to item 5 of the patent application scope, wherein the torsion spring further has an extension portion, and the active contact surface is located on the extension portion. 7. The paper feeding device according to item 6 of the scope of patent application, wherein the torsion spring has a fixed end and a central shaft, the fixed end is fixedly connected to the central shaft to the paper feed slot, and the extension portion is wound around the center The shaft rotates. 0535-10183TW (Nl); A03132; TKLIN.ptd Page 18 1220413 6. Scope of patent application 8. The paper feeding device described in item 1 of the scope of patent application, wherein the active contact surface is a flat surface. 9. The paper feeding device described in item 1 of the scope of patent application, wherein the passive contact surface is a flat surface. 10. A paper feeding device, comprising: a rotating shaft; a paper taking arm that rotates around the rotating shaft and has a passive contact surface; an elastic element; a contact member connected to the elastic element and having an active contact surface, When the paper picking arm is in a first position, the active contact surface and the passive contact surface are in contact with a first contact point in space. At this time, the elastic element applies a first moment to the rotating shaft. When the paper arm is in a second position, the active contact surface and the passive contact surface are in contact with a second contact point in space. At this time, the elastic element applies a second moment to the rotating shaft, wherein the first moment and This second moment is approximately equal. 11. The paper feeding device according to item 10 of the scope of patent application, wherein the paper picking arm further has a paper picking roller, which is in contact with a sheet of paper and exerts a force on the paper by the first moment. 1 2 · The paper feeding device described in item 10 of the patent application scope further includes a paper feeding slot, wherein the paper is located in the paper feeding slot. 13. The paper feeding device according to item 10 of the scope of patent application, wherein the elastic element is a torsion spring. 1 4. The paper feeding device according to item 13 of the scope of patent application, wherein the torsion spring is fixedly connected to the paper feeding slot. 0535-10183TW (Nl); A03132; TKLIN.ptd Page 19 1220413 VI. Patent application range 1 5. The paper feeding device described in item 14 of the patent application range, wherein the torsion spring has a fixed end and a center A shaft, the fixed end is fixedly connected to the paper feed slot with the central shaft, and the contact member rotates around the central shaft. 16. The paper feeding device according to item 12 of the scope of the patent application, wherein the elastic element is a tensile spring connected to the paper feeding slot and the contact member. 1 7. The paper feeding device described in item 10 of the scope of patent application, wherein the active contact surface is a flat surface. 1 8. The paper feeding device according to item 10 of the scope of patent application, wherein the passive contact surface is a flat surface. 0535-10183 ™ F (Nl); A03132; TKLIN.ptd Page 20