TWI284625B - Automatic document feeder for a printer - Google Patents

Abstract

An automatic document feeder (ADF) comprising a document separating plate, a document tray, a drive roller, a presser arm, and an elastic component is provided. The document tray is tilted on the document separating plate, and the drive roller is positioned on the document tray for driving a document downward and leaving the ADF through the document separating plate. The presser arm is positioned on the document separating plate and connects to the drive roller. The elastic component connecting to the presser arm is provided with an elastic force to draw the drive roller moving toward the document tray. Thus a distance between the drive roller and the document tray may be adjusted according to the thickness of document automatically.

Description

1284625

[Technical Field] The present invention relates to a paper feeding mechanism and a printing using the paper feeding mechanism, in particular, a paper feeding mechanism having a fixed paper feeding roller to drive a document and using the paper feeding mechanism Printing device. [Prior Art] Press 'in the design of a facsimile machine, a printer, or even a multifunction machine' to meet the needs of A 4 paper work, the pass f has a -feed mechanism. The user can put a large amount of paper into the paper feeding mechanism, and the paper feeding mechanism can perform the paper dividing work, and feed the paper one by one into the machine for the operations of printing, printing, photocopying and the like. Please refer to the first figure for a schematic diagram of a typical paper feeding mechanism. As shown in the figure, the paper feeding mechanism 10 has a paper feed slot 12, a paper separator 14, a dream shaft 16, a pickup arm 18 and a pickup roller 19. The two ends of the rotating shaft ^ are fixed to the two sides of the paper feeding slot 12, and the paper separator 丨4 is disposed at the lower end of the paper loading slot 12. At the same time, one end of the pick-up arm 8 is pivotally connected to the rotating shaft 16, and the other end is connected with a pickup roller 丨9. As the paper thickness in the paper cassette 丨2 changes, the pickup arm 18 rotates around the rotation shaft 16 to adjust the position of the paper roller 19 to continuously press the pickup roller 19 to the paper. Above the surface. It is worth noting that in the paper feeding mechanism 丨0 of the first figure, the paper take-up roller 19 must be continuously pressed against the upper surface of the paper, and a positive force of the paper is applied.

Page 6 1284625

V. INSTRUCTIONS (2) Drive the paper with sufficient friction. Please refer to the second A and B diagrams, which are side views of the paper feeding mechanism of the first drawing in the state of full paper and empty paper. As shown in the figure, the torque τ generated by the rotation of the rotating shaft 16 not only drives the pickup roller 19 on the pickup arm 18 to rotate, but also drives the pickup arm 8 to rotate in the direction of the pickup roller. 1 9 Press on the upper surface of the paper 20 and apply a sufficient amount of positive force to the paper. In addition, when the paper take-up roller 19 drives the paper 2 to feed downward, the lower edge of the paper 20 is blocked by the paper separator 14 to cause bucking. This bending action causes the paper 20 on the outermost surface to be separated from the other sheets and fed separately. ' As shown in the second A picture, in the full paper state, the contact position of the pickup roller 19 and the paper 20 is P1, and the separation distance between P1 and the paper separator 14 is D1, and the number of papers 20 is reduced until the first In the empty paper state shown in FIG. 2B, the pickup roller 19 is press-fitted to the bottom surface of the paper feed slot 12, the contact position with the paper feed slot 12 is P2, and the paper separation distance between P2 and the paper separator 14 is D2. As described above, as the number of sheets 20 changes, the movement path of the pickup roller 19 is an arc S centered on the rotation axis ,6, whereas the position of the separator 14 is fixed. Therefore, as the number of sheets changes, the contact position of the pickup roller 19 and the sheet 2 is constantly changing, resulting in a change in the separation distance. Please refer to the third figure for a schematic diagram of another typical paper feeding mechanism. Compared with the paper feeding mechanism of the first drawing, the rotating shaft 26 of the paper feeding mechanism is disposed below the paper chute 2 2, and the pickup arm 28 is pressed upward to the right to the surface of the paper. Since the pickup arm 28 is also pivotally coupled to the rotary shaft 26, as the number of sheets changes, the movement path of the pickup roller 29 forms a circular arc S' centered on the rotary shaft 26. The position at which the pickup roller 29 is in contact with the paper is constantly changing, and

1284625 V. INSTRUCTIONS (3) The effect of distorting the paper caused by the general separation of the paper, and shrinking, if the paper is to be frictional, the paper will be affected by the paper separator. The three figures are stable in the paper bin 1 2, and the paper and paper are separated as much as possible from the paper. In other words, when the buckling causes the rigid paper of the leading edge of the paper to be twisted, the larger force of the paper separator is too large, and the paper feeding mechanism of the paper or paper is separated from the paper inside the paper. The paper separation effect is to increase the phenomenon of feeding loss, such as a certain value, the paper is affected by, but the raw is easy to produce the roller, the resistance is also easy to cause the paper roller to be too small, and the distance from the big life is obviously longer.) The bigger. The production of the phenomenon is not the result of the paper, and the force generated by the paper is taken, and it is easy to cause the separation or damage to be taken. The paper mechanism to mention the matter, how to change the V good feed has become the most to the separator is too large, if it is distorted. The paper must be relatively raised, and the paper is damaged and idling. Both will affect, and if they are small, they will change, and the block will affect the separation of the paper. Therefore, . At the same time, the effect of the paper separation is the first picture. With the placement, the paper stability cannot be maintained, and the efficiency of the folder is avoided, and the design of the paper-feeding mechanism is saved, so that the paper-cutting distance needs to be improved. SUMMARY OF THE INVENTION A The main object of the present invention is to provide a paper feeding mechanism that has a uniform paper separation distance regardless of the amount of paper placed in the groove to provide a stable paper feeding effect.

1284625 V. Inventive Description (4) The paper feeding mechanism of the present invention is used for feeding paper into a business machine, including a paperboard, a paper feeding tray, a paper take-up roller, a paper take-up arm and an elastic member; Wherein, the split cardboard is located at the paper feed inlet of the transaction machine, and on the upper surface of the split cardboard, a paper feed tray is obliquely arranged to place the paper; the take-up roller is located on the front side of the paper feed tray and is pressed against the paper In the upper part, the paper is fed downwardly through the paperboard into the transaction machine; the paper extraction arm is located on the paperboard, and the elastic member is connected to the paper take-up arm, and is coupled to the paper to dynamically adjust the thickness of the paper take-up roller. Also, the paper thickness changes in the case of taking paper. The elastic member uses a torsion bomb away from the position of the paper feed tray. Small phase ‘near torque. The pickup arm drives the pickup roller to move to keep the pickup roller and the separation paper. 0 The elastic member uses a tensile projectile that is close to the position of the paper feed tray. The paper retracting roller is used directly by the take-up arm to continuously press the paper. The paper take-up arm directly grabs the paper roller and continuously presses it on the paper.

The square' is connected to drive the paper take-up roller, and provides a force to drive the distance of the paper take-up roller feed tray. The moving range of the paper arm can be greater than the full paper and empty. In one embodiment of the present invention, the spring, With the pick-up roller at the closest and lowermost, the torsion spring can provide substantially greater distance in the embodiment of the invention, moving the plate in the direction of the parallel splitter, ie the so-called separation distance in the present invention In one embodiment, the spring 'sends the pick-up roller at the closest and lowermost' to provide substantially greater tension springs. In one embodiment of the invention, the amount drives the pick-up arm to slide down and up, thereby In an embodiment of the present invention, the amount of the elastic member is omitted, and the amount drives the pickup arm to slide obliquely downward, so that

Page 9 1284625 V. Inventive Note (5) Therefore, the use of elastic members can be omitted. Paper Arm In one embodiment of the invention, the paper feed tray and the access system are perpendicular to each other to provide a stable positive force. , ~, moving parts of the ear, further understanding of the drawings, the advantages and spirit of the present invention can be

In the following description, in order to be able to find the technical solution of the present invention, in different embodiments, if the functional phase of the component is consistent, It is still the same name and figure number. Similarly, the shape is slightly. Please refer to the fourth embodiment A and B. The embodiment of the paper feeding mechanism of the present invention is in the side of the full paper state and the empty paper state = a preferred ~ η The paper feeding mechanism may be externally applied to a transaction machine (not shown) or a printing device (not shown), or directly to a transaction machine or a printing device. The paper feeding mechanism comprises a paperboard 104, a paper feed tray 2, a picking roller 109 and a picking arm 108. Among them, the dividing board 1〇4 is for the paper feeding inlet A of the transaction machine, and the upper surface of the dividing board 104 is inclined.

Feed tray 1 0 2 ' to place paper 1 2 0. The pickup roller 1 〇 9 is located on the front side of the paper feed tray 1 0 2 and is pressed against the paper 1 2 0 to roll the paper 1 2 〇 to be fed downward into the printer via the paper separator 104. The pickup arm 108 is located above the sorting board 104, and is connected to drive the take-up roller 1 〇9. It should be noted that the moving range of the paper take-up arm 108 is greater than the thickness variation of the paper in the case of full paper and empty paper, and therefore, the distance between the paper take-up roller 1 〇 9 and the paper feed tray 1 〇 2

1284625 V. Invention description (6) It can be adjusted dynamically with the thickness of paper 120. It is to be noted that, in this embodiment, the state in which the paper is fed is described. However, the present invention is not limited thereto, and the paper feeding device of the present invention can be applied to other kinds of recordable media such as a slide. As shown in the figure, in order to guide the moving direction of the pickup arm 1 〇 8, a roller guide 106 is disposed adjacent to the paper feed tray 102. In order to adjust the position of the pick-up arm 1,0 8 in accordance with the change of different paper thicknesses, the roller guide 106 and the paper feed tray 102 have an inclination angle X therebetween. The pick-up arm 108 has a first projecting shaft 122 and a second projecting shaft 124 which are respectively slid into the roller guide 106. Therefore, it is ensured that the pickup arm 1 〇 8 is movable in the direction of the parallel roller guide 110, in other words, the pickup roller 1 〇 9 is movably disposed on the roller guide 106. In addition to the first projecting shaft 122 and the second projecting shaft 124 disposed on the pick-up arm 108, the direction of movement is ensured. As shown in FIGS. 5A and B, a long strip of protrusion 126 may be used instead of the first. a protruding shaft 122 and a second protruding shaft 124, the length of the elongated protrusion 26 and the roller guide 1〇6 are approximately the same 'thus, thus ensuring that the pick-up arm 8 can only follow the roller slide The direction of 1 〇6 moves linearly. A tensile spring 110 is coupled to the pickup arm 1〇8 along the direction of the roller guide 106 to provide a force to urge the pickup roller 109 to move relative to the paper feed tray 1〇2, and The paper 12 can be selectively driven in contact with the paper 120. Moreover, in order to make the distance between the pickup roller 1〇9 and the separation board 101 (the so-called separation distance a), it can be maintained in a state of full paper and empty J, and the direction of the roller guide 丨〇6 It is parallel to the direction of the branch and the plate 1 〇4. Therefore, the pickup arm 1 0 8 drives the pickup roller 1 〇9, ❿

1284625 V. INSTRUCTIONS (7) Move in the direction of the parallel dividing board 1 〇 4. In order to further ensure that the direction of movement of the pick-up arm 丨0 8 is parallel to the direction of the paperboard 104, please refer to the sixth figure. In another embodiment of the present invention, two mutually parallel guide grooves 42 and The 144 series is disposed adjacent to the paper feed tray 102, and the pick-up arm 108 has a first protruding shaft 152 and a second protruding shaft 154, respectively sliding in the two guiding grooves 142 and 144, and the paper taking roller The 1 0 9 system is disposed between the two protrusions 1 5 2 and 1 5 4 . Therefore, it is ensured that the pickup roller 109 is movable in the direction of the guide grooves 42 and 144.

In general, if the paper feeding mechanism is installed in the printing device, the paper feed tray 102, the paperboard 1〇4 and the roller guide 6 are disposed on the housing of the printing device. That is, corresponding to the pickup arm 1 〇 8 and the pickup roller 109, it is fixed. In addition, there is an inclination angle X between the roller guide 1 Q6 and the paper feed tray. When the angle of the inclination angle x is 90 degrees, the roller guide 1〇6 and the paper feed tray 102 are substantially perpendicular to each other. The elastic restoring force of the aforementioned tension spring 11 可 can be completely converted [for the positive force, the paper take-up roller 丨〇 9 is pressed against the paper 12 ,, so ' can be used as a stable source of positive force.

It is to be noted that, in the present invention, the position of the pickup arm 108 is dynamically changed as the number of sheets 120 changes, and therefore, the conventional transmission method as shown in Fig. 8 is not applicable thereto. In order to solve this problem, the spear J of the present invention is designed with a set of Swi ng Gears to send the power of the motor to the = paper roller 丨 09. As shown in FIG. 4A, the rotating gear set 13 includes a rotating plate 132, a sun gear 134 and a rotating gear 136, and the sun gear 134 and the rotating plate 132 are connected to a motor (not shown). Rotation

1284625 V. INSTRUCTION DESCRIPTION (8) Shaft ′ At the same time, the sun gear 1 3 4 and the turning gear 1 3 6 are positioned on the rotating plate 1 3 2 and are coupled to each other. The power generated by the motor not only drives the rotary plate 132' to cause the rotary gear 136 to be coupled to the relay gear 138 on the pickup arm 1〇9. At the same time, the pickup roller 109, which is coupled to the relay gear 138, is also rotated by the rotation of the sun gear 134 and the rotation gear 136. In the foregoing embodiment, the tension spring 11 使用 is used as a source of force for driving the pickup roller 109 to the surface of the paper 1 2 ,, but is not limited to the use of the tension spring 11 〇. Referring to Figures 7A and b, there is shown a side view of a further embodiment of the paper feeding mechanism of the present invention in a full paper state and an empty paper state. This embodiment replaces the tension springs 10 0 in the fourth a and B drawings with the twist springs 1 2 to urge the pickup roller 丨〇 9 to the surface of the paper sheet 2 . It should be noted that in order to make the pickup roller 丨〇 9 at the position closest to and farthest from the paper feed tray fl 02 (ie, the empty paper state and the full paper state), the torsion spring 112 can provide a substantially similar torque. The original length of the torsion spring 112 should be increased as much as possible to reduce the amount of change in the elastic restoring force of the magazine unit length change. ~ In the embodiment of the fourth A and seventh A, the elastic member, that is, the tension spring and the red spring, is used to urge the pickup roller 1 0 9 to "paper 1 2". The surface of the dragonfly, however, is not limited to this. Referring to FIGS. 8A and B, in another embodiment of the present invention, the roller guide 106 is used as a chute, and the roller guide 1〇6 has a tilt and an angle y. The take-up arm 1 〇 8 of the β-integrated roller guide 1 〇 6 is driven by its own weight and slides down obliquely to the paper 120. Therefore, the paper take-up roller 1 0 9 acts on the secret π, the π, and the positive force of the surface of the sheet is subjected to the aforementioned

1284625 V. DESCRIPTION OF THE INVENTION (9) The magnitude of the inclination angle y is determined by the weight of the pickup arm 108, and the present embodiment can also dispense with the use of the elastic member. It can be seen that the paper feeding mechanism of the present invention has the following advantages compared with the conventional paper feeding mechanism: 1. As shown in the fourth A, fifth and sixth figures, the present invention utilizes the roller guide 106 to guide the pickup arm. The direction of movement of 108 causes the pickup roller 1〇9 to move in the direction of the parallel separation board 104, thereby ensuring that the separation distance is maintained constant. Therefore, the paper separation stability of the paper feeding mechanism can be improved, and the phenomenon that the paper and the paper are damaged can be avoided, so as to improve the working efficiency of the transaction machine and the waste of time for paper removal. ’

1. As shown in Figures 4A and 7A, the present invention utilizes the elastic member (i.e., the tension spring 110 and the twisted magazine 112) to feed the paper roller 120 to the main source of the positive force of the paper 120. . Therefore, it is desirable to select a suitable elastic member to provide a positive force of a suitable size:: The paper separation stability of the high paper feeding mechanism. k 士? The present invention is described in detail by the preferred embodiments, and is not intended to limit the scope of the invention; And adjustments will remain without departing from the spirit and scope of the invention. also

1284625 Brief description of the diagram Simple illustration: The first diagram is a schematic diagram of a typical paper feeding mechanism. The second A and B drawings are side views of the paper feeding mechanism of the first drawing in a state of full paper and empty paper. The second figure is a schematic view of another typical paper feeding mechanism. The fourth and B drawings are a side view of a preferred embodiment of the paper feeding mechanism of the present invention in a state of full paper and empty paper.

Figs. 5A and B are views showing a sliding structure of the pickup arm and the roller slide in the paper feeding mechanism of the present invention, and a side view of another embodiment. Figure 6 is a side elevational view of another embodiment of the paper feed mechanism of the present invention. Seventh A and B are still another embodiment of the paper feeding mechanism of the present invention, in a side view in a full paper state and an empty paper. Figures 8A and B are a side view of a further embodiment of the paper feeding mechanism of the present invention in a full paper state and an empty paper state. Description of the figure: Paper feeding mechanism 10 points of paperboard 1 4, 2 4, 1 (H Picking arm 18, 28 Paper 20, 120 Picking arm 1 0 8 Twisting spring 11 2 Paper chute 1 2, 2 2 Rotary shaft 1 6 , 2 6 Pick roller 19, 29, 109 Tray 1 0 2 Stretch spring 11 0 Roller guide 106

1284625 Schematic description of the rotary gear set 1 3 0 Center gear 1 3 4 Relay gear 1 3 8 Second shaft 124, 154 Long protrusion 1 2 6 Rotary plate 1 3 2 Rotary gear 136 First Projection shaft 1 2 2,1 5 2 guide groove 242,244 (

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Claims (1)

1284625 VI. Patent Application Scope of Application: 1 · A printing device comprising: a housing comprising: a paper feed tray for recording media; a cardboard, located a leading edge of the paper feed tray to separate the recordable medium from the paper feed tray one by one; and a guide rail disposed adjacent to the paper feed tray and having a disease between the paper feed tray and the paper feed tray angle; a paper take-up roller movably disposed on the guide, the paper take-up roller being movable relative to the paper feed tray, and selectively contacting the recordable medium to drive the recordable medium; and An elastic member is disposed between the pickup roller and the housing to provide a force to drive the pickup roller to move toward the paper feed tray. 2. The printing device of claim 3, wherein the guide is substantially parallel to the paperboard. ^ 3 · The printing device of the application, the scope of the first item, further comprising a motor and a Swing Gear group fixed in the printing device, the motor driving the rotation through the rotating gear set The paper roller rotates. ... 4 · As in the scope of the patent application, the printing j is a torsion spring, and when the pickup roller is near and farthest from the recordable medium, the twist is fixed. Torque. </ br> 1 5 · If you apply for the printing device in the first paragraph of the patent scope, it also includes a paper take-off Page 17 1284625 VI. Scope of Application ------- Set on the guide rail, and the pick-up arm has a first projecting shaft and a second projecting shaft, respectively sliding in the guide rail. 6. The printing device of claim 5, wherein the guide rail comprises two parallel guiding grooves, and the first protruding shaft and the second protruding shaft of the paper take-up arm are respectively slid to The two guiding grooves are disposed between the two protruding shafts. 7. If you apply for a patent scope! The printing device further includes a pick-up arm disposed on the guide, and 'the pick-up arm has an elongated protrusion on the guide rail, so that the pick-up arm can follow the Slide the direction of the guide. 8. A paper feeding mechanism, disposed in a printing device for feeding recordable media into the printing device, the paper feeding mechanism comprising: a dividing cardboard 'media feeding inlet located at the printing device; a paper feeding tray a plate obliquely standing on the upper surface of the paperboard to place the recordable medium; ^ a paper take-up roller on a front side of the paper feed tray and press-fitted on the recording medium to scroll the recordable medium Moving downward, feeding the printing device through the paperboard; and the picking arm is located above the paperboard, and is connected to drive the paper taking ^ X cooperates with the thickness of the recordable medium to adjust the distance between the pickup roller and the paper tray; and 4Z elastic member is connected to the pickup arm to provide a force to drive the W, and the roller to fit To the recordable media. k. The paper feeding mechanism of the eighth aspect of the patent, wherein the elastic member ', the tension spring (tensional spring). 1284625 VI. Application for Patent Range 1 0. The paper feeding mechanism of claim 8 wherein the elastic member is a torsion spring. 1 1 . The paper feeding mechanism of claim 8 , wherein a movement range of the pickup arm is larger than a thickness of the recordable medium and not loaded with any recordable medium; Variety. 1 2 - The paper feeding mechanism of claim 8 further includes a motor and a rotating gear set fixed in the printing device, and the motor drives the paper taking roller to rotate through the rotating gear set . 1 3 · a paper feeding mechanism, installed in a printing device to feed recordable media into the printing device, the paper feeding mechanism comprising: · a cardboard board located at the media feed inlet of the printing device; a paper tray slanting on the upper surface of the paperboard to place the recordable medium; a paper take-up roller located on the front side of the paper feed tray and pressed onto the recordable medium to scroll the same The recording medium is moved downwards, fed into the printing device via the sub-board; a chute 'being above the sub-board, and having a tilt angle; and a pick-up arm sliding to the chute And the paper pick-up roller is connected, and the weight of the pick-up arm drives the pick-up arm to slide down obliquely, so that the pick-up roller is continuously pressed against the recordable medium. 1 4. The paper feeding mechanism of claim 13 wherein the moving arm of the paper picking arm is larger than the paper feeding tray, filling the recordable medium with any of the recordable media The thickness varies. 1284625 VI. Patent application scope The paper feeding mechanism of claim 3, further includes a motor and a motor gear set fixed in the printing device, and the motor is driven by the ash gear set. The pickup roller rotates. a paper feeding mechanism for printing a recordable medium into the printing device, the paper feeding mechanism comprising: a paperboard, located at a media feed inlet of the printing device; &amp; pulling a paper feed a pallet obliquely standing on the upper surface of the paperboard to place the recordable medium; a paper take-up roller located on the front side of the paper feed tray and pressed against the media to scroll the recordable medium Moving downward, feeding the printing device through the branch, and the paper picking arm is located above the paperboard and connecting the paper picking roller to drive the paper picking roller to follow the essence Moving in parallel with the direction of the splitter; and a two-fold elastic member coupled to the pick-up arm to provide a force to urge the pick-up roller to abut the recordable medium. 1 7 The paper feeding mechanism of claim i, wherein the C elastic member is a tension spring. 1 8 The paper feeding mechanism of claim 6, wherein the elastic member is a torsion spring. 19. The paper feeding mechanism of claim 16, wherein the movement range of the pickup arm is greater than the thickness variation between the recordable medium and any non-recordable medium loaded on the paper feed tray. . 20. The paper feeding mechanism of claim 16 of the patent application, further comprising a motor and 1284625 VI. Patent Application Range A rotating gear set is fixed in the printing device, and the motor drives the paper take-up roller to rotate through the rotating gear set. ❿ ΙΗΪ第21页