WO2012041207A1

WO2012041207A1 - Deflection correction mechanism for sheet-type medium and medium processing device having the mechanism

Info

Publication number: WO2012041207A1
Application number: PCT/CN2011/080180
Authority: WO
Inventors: 张继刚; 许芳; 陶鹏; 徐伟伟
Original assignee: 山东新北洋信息技术股份有限公司
Priority date: 2010-09-30
Filing date: 2011-09-26
Publication date: 2012-04-05
Also published as: CN102442564B; CN102442564A

Abstract

Disclosed are a deflection correction mechanism for a sheet-type medium and a medium processing device having the deflection correction mechanism. The deflection correction mechanism comprises: a deflection correction roller assembly (1); an adjustment roller assembly (2); a sensor, for detecting a medium in a medium passage; and a control mechanism. The deflection correction roller assembly (1) comprises a first driving roller (12) and a paper pressing mechanism (11) used with the first driving roller, the sheet-type medium being deflectably located between the first driving roller (12) and the paper pressing mechanism (11). The adjustment roller assembly (2) is located downstream of the deflection correction roller assembly in the direction in which the medium is conveyed and comprises a second driving roller (22) and a driven roller (21) disposed tangent to the second driving roller. The control mechanism is used for controlling rotation of the first driving roller (12) and delaying the start of the second driving roller (22) when the sensor detects the medium. The present invention has a compact structure and can correct deflection of the medium within a short transmission distance.

Description

Sheet medium medium correcting mechanism and medium processing device having the same

This application claims the priority of the Chinese invention patent application filed on September 30, 2010, filed on the Chinese Intellectual Property Office, with the application number 201010504019.1, entitled "Sheet Media Correction Mechanism and Media Processing Equipment with the Mechanism", all of which The disclosure is hereby incorporated by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-type medium correcting mechanism and a medium processing apparatus having the sheet-like medium correcting mechanism. BACKGROUND OF THE INVENTION Existing sheet-type media processing equipment, such as printers, scanners, kojis, etc., have a paper transport mechanism that is typically transported by a pair of rollers that are driven by a drive roller that is coupled to the drive motor. And a driven roller that is tangentially matched with the driving roller. In order to accommodate as many media types as possible, the width of the transport mechanism is often greater than the width of the media. Therefore, when the media is transported, the media may be deflected, which may result in inaccurate position of media recording operations such as printing and scanning. Causes malfunction and inconvenience to the user. Chinese Patent No. 200510121474.2 discloses a technical solution for correcting a medium, wherein the correcting mechanism is fixed on the paper path, and is disposed at an angle with one side of the paper path, that is, the reference surface. When the paper is fed into the paper path through the correcting mechanism, the correcting mechanism always pushes the paper in the direction of the reference surface until the paper is aligned along the reference surface, thereby realizing the paper correcting function. The technical solution of the medium rectification is corrected in the process of continuously transmitting the medium, so the medium conveying path must be long enough to complete the correcting action, and the device is not miniaturized. Chinese Patent Application No. 200910261039.8 discloses another technical solution for correcting the medium, which uses the deflection deformation of the sheet to achieve the deviation correction, and reduces the length requirement of the medium conveying passage. Specifically, the sheet is conveyed by a pair of conveying rollers, the front end of the sheet is prevented from continuing to advance by the door member, and a guide portion is provided between the door member and the pair of conveying rollers to guide the sheet to be flexibly deformed, and is also high in rigidity. The sheet reduces the friction between the sheet and the guide by providing a rotating member on the guide. The deformed sheet front end is aligned with the door member, and the aligned front end of the sheet is picked up and printed without deflection, thereby realizing the correction of the sheet. However, for sheets of different stiffness, the amount of deflection required for alignment is not the same, otherwise there is a problem that the deflection of the sheet is too small and the sheet alignment is not good or the amount of deflection is too large. The sheet has the possibility of wrinkles. SUMMARY OF THE INVENTION An object of the present invention is to provide a compact sheet-type medium correcting mechanism with a rectifying function to accommodate sheet-like media of different rigidity. It is still another object of the present invention to provide a medium processing apparatus having the sheet-like medium correcting mechanism. To this end, an aspect of the present invention provides a sheet-type medium correcting mechanism comprising: a correcting roller assembly including a first driving roller and a paper pressing mechanism engaged with the first driving roller, wherein the sheet-like medium is deflectably located Between the first driving roller and the platen mechanism; the regulating roller assembly, located downstream of the correcting roller assembly in the media conveying direction, comprising a second driving roller and a driven roller tangentially disposed with the second driving roller; for detecting the medium passage a sensor of the medium; and a control mechanism for controlling the rotation of the first drive roller and delaying the rotation of the second drive roller when the sensor detects the medium. Further, the above-described platen mechanism includes at least one ball assembly arranged in the direction of the axis of the first drive roller, the ball assembly including free-rolling balls and ball holders disposed tangentially to the first drive roller. Further, the ball retaining member includes a barrel that accommodates the ball and an elastic member that biases the ball outward in the barrel, wherein the opening diameter of the barrel is smaller than the outer diameter of the ball. Further, the sheet medium correcting mechanism further includes a transition assembly for supporting the medium on the medium passage between the correcting roller assembly and the adjusting roller. Further, the transition assembly includes a freely rotatable ball and ball retainer that supports the medium. Further, the first driving roller is arranged perpendicular to the medium conveying direction. Further, the first driving roller is arranged to be obliquely intersected with the medium conveying direction. Further, the sensor is located on the correcting roller assembly of the medium passage along the medium conveying direction

Further, the sensor is located in the correction roller assembly of the medium passage and the adjustment roller assembly

Further, the above-described correcting roller assembly includes two ball assemblies. According to another aspect of the present invention, there is provided a medium processing apparatus having the sheet-like medium correcting mechanism of the above configuration. The invention utilizes the adjusting roller assembly to prevent the deflected front end of the medium from continuing to move while rotating the first driving roller of the correcting roller assembly. During the continuous rotation of the first driving roller, the deflection of the medium by the platen mechanism of the correcting roller assembly Or the backing does not have a blocking effect. After the front end of the medium is blocked, the deflected rear end is automatically deflected on the basis of the front end of the adjusting roller, thereby realizing the alignment between the front end of the medium and the regulating roller, and the medium deviation is completed. The process of oblique correction. In the medium correcting mechanism of the present invention, the amount of flexural deformation of the sheet-like medium of different rigidity can be adaptively adjusted, and there is no problem that the amount of flexural deformation is too large or too small. At the same time, the compact structure of the present invention enables the medium to be deflected within a short transmission distance, which is more advantageous for miniaturization of the device. Other objects, features, and advantages of the invention will be set forth in the <RTIgt; BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG 1 is a longitudinal sectional view of a first embodiment of a paper correcting mechanism according to the present invention; FIG. 2 is a plan view of the paper correcting mechanism shown in FIG. 1. FIG. 3 is a modified embodiment of the paper correcting mechanism shown in FIG. Figure 4 is a longitudinal cross-sectional view of a second embodiment of a paper rectifying mechanism in accordance with the present invention; Figure 5 is a plan view of a third embodiment of a paper rectifying mechanism in accordance with the present invention; and Figure 6 is a paper rectification according to the present invention. A flow chart of a control method of the mechanism; Fig. 7 is a longitudinal sectional view of a fourth embodiment of the paper correcting mechanism according to the present invention; and Fig. 8 is a flow chart showing another control method of the paper correcting mechanism according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a first embodiment of a sheet correcting mechanism according to the present invention, and Fig. 2 is a plan view showing the sheet correcting mechanism shown in Fig. 1. As shown in FIGS. 1 and 2, the paper correcting mechanism includes a correcting roller assembly 1, a regulating roller assembly 2, a detecting assembly, a first driving mechanism 5, a second driving mechanism 6, and a control mechanism (not shown). Wherein, the correcting roller assembly 1 is used for correcting the deflection of the medium; the adjusting roller assembly 2 is located downstream of the correcting roller assembly 1 in the medium conveying direction, and is used for conveying the medium downstream when the adjusting roller assembly 2 is rotated, when the adjusting roller assembly 2 When the rotation is stopped, it is used to prevent the medium from moving; the detecting component 3 is disposed at the entrance of the paper correcting mechanism for detecting the presence or absence of the medium; the first driving mechanism 5 is drivingly connected with the correcting roller assembly 1 for driving the correcting roller assembly 1 to move The second drive mechanism 6 is drivingly coupled to the adjustment roller assembly 2 for driving the movement of the adjustment roller assembly 2. The correcting roller assembly 1 includes at least one set of ball assemblies 11 and a first drive roller 12. The first driving roller 12 may be a roller whose length is adapted to the width of the channel, or may be correspondingly set to a plurality of rollers according to the number of the ball assemblies 11, as shown in FIG. 2, the correcting roller assembly 1 in this embodiment includes The two sets of ball assemblies 11, the first drive roller 12 are two-stage rollers, and the two-stage rollers respectively correspond to the two sets of ball assemblies. Among them, the ball assembly 11 includes a first ball 113 and a ball holder. The ball retainer includes a first base (ie, a barrel) 111 and a resilient member 112. The first base 111 is a barrel-shaped structure having an opening diameter smaller than the inner diameter of the barrel; the elastic member 112 is placed inside the barrel of the first base 111, one end abuts against the bottom of the first base 111, and the other end abuts On the first ball 113; the outer diameter of the first ball 113 is larger than the opening diameter of the first base 111, which is smaller than the inner diameter of the barrel, and the first ball 113 is placed inside the barrel of the first base 111, and is subjected to the elastic member 112. Abutting at the opening of the first base 111, the first ball 113 extending from the opening of the base is tangent to the first driving roller 12. Further, the ball retainer may have other structures, for example, a ball guide is provided in the first base 111. The adjustment roller assembly 2 includes a driven roller 21 and a second driving roller 22 which are disposed tangentially. In this embodiment, the driven roller 21 and the second driving roller 22 are respectively disposed as three-stage rollers. In other embodiments, the driven roller 21 and the second driving roller 22 may also be respectively set to a length corresponding to the channel width. Roll or multi-roller. The detecting assembly 3 includes a first sensor 31, which is disposed at an inlet upstream of the correcting roller assembly 1 in the medium conveying direction for detecting the presence or absence of a medium at the inlet. Preferably, the paper correcting mechanism further comprises at least one set of transition assemblies 4 (shown in FIG. 4) disposed between the correcting roller assembly 1 and the adjusting roller assembly 2 for mitigating the medium and the passage during the correcting process of the correcting roller assembly 1. Friction for better media deflection correction. Fig. 3 is a schematic view showing a modified embodiment of the sheet correcting mechanism shown in Fig. 2. As shown in Fig. 3, the correcting roller unit 1 includes only one ball assembly. Figure 4 is a longitudinal cross-sectional view showing a second embodiment of the sheet correcting mechanism according to the present invention. As shown in FIG. 4, the transition assembly 4 includes a second ball 41 and a second base 42. The second base 42 is a barrel-shaped structure having an opening diameter smaller than the inner diameter of the barrel and having a trapezoidal shape in section; the second ball 41 The outer diameter is larger than the opening diameter of the second base 42 and smaller than the inner diameter of the barrel. The second ball 41 is placed inside the barrel of the second base 42 and can move freely inside the second base. The second ball 41 extends out. The portion of the opening of the base 42 is located in the media passage in rolling contact with the medium to reduce the friction of the medium during operation. It should be noted that when the paper correcting mechanism includes a plurality of sets of transition assemblies 4, the plurality of sets of transition assemblies 4 are located between the correcting roller assembly 1 and the regulating roller assembly 2, and are arranged perpendicular to the medium conveying direction. Figure 5 is a plan view of a third embodiment of a sheet correcting mechanism in accordance with the present invention. The difference between this embodiment and the first embodiment is that the angle between the axial direction of the first driving roller 12 of the correcting roller assembly 1 and the medium conveying direction is not equal to 90 degrees, that is, the first driving roller 12 is opposed to the medium. The conveying direction is placed obliquely. As shown in the figure, assuming that one side C of the medium running direction is the reference surface, one end of the first driving roller 12 away from the reference surface C is inclined toward the adjusting roller assembly 2, and the first driving mechanism 4 drives the first driving roller 12 to rotate. The first ball 113, which is tangential thereto, rolls, and always pushes the medium in the direction of the reference plane C until it is aligned along the side of the reference plane C. Next, a control method of the correcting mechanism according to the present invention will be described. Figure 6 is a flow chart showing a control method of the paper correcting mechanism according to the present invention. The correcting method provided in this embodiment specifically includes: Step S101: Is there paper in the entrance? If yes, step S102 is performed, otherwise, it is continued to detect whether there is paper in the entrance. When the medium is at the inlet, the medium covers the surface of the first sensor 31 disposed at the inlet, the first sensor 31 outputs a first detection signal, such as a high level; when there is no medium at the inlet, the first sensor 31 outputs the first Two detection signals, such as low level. The control mechanism can determine whether the medium exists at the entrance according to the change of the output signal of the first sensor 31. If the control mechanism determines that the medium exists at the entrance, step S102 is performed; otherwise, it continues to detect whether the medium exists in the entrance. Step S102, driving the correcting roller assembly to move. After the control mechanism determines that the medium exists at the entrance, the first driving mechanism of the first driving mechanism driving the correcting component 1 is controlled to rotate, and the first ball 113 that is tangential thereto is driven to roll, and the first driving roller 12 and the first ball are located. The medium between 113 is transported downstream. As shown in Figure 5, when the skewed media A side front end is first connected to the adjustment At the time of the roller assembly 2, at this time, since the regulating roller assembly 2 is not rotated, the blocking medium continues to be conveyed, and therefore, the first ball 113 of the correcting roller unit 1 adjacent to the A side is slipped with respect to the surface of the medium, and the front end of the other side B of the medium is It has not yet abutted against the adjustment roller unit 2, so that the first ball 113 of the correction roller unit 1 adjacent to the B side is rotated relative to the first drive roller 12, and the medium between them is continuously conveyed, so that the front end of the medium is the A side. The center of the circle rotates counterclockwise until the front end of the medium B side also abuts against the adjustment roller assembly, correcting the deflection of the medium. In the second embodiment of the paper rectifying mechanism according to the present invention, the medium is in rolling contact with the second ball 41 of the transition assembly 4 during the conveyance of the medium to the regulating roller assembly, thereby reducing the friction of the medium during the transmission. , the correcting effect of the correcting roller assembly 1 is more obvious. In the third embodiment of the paper rectifying mechanism according to the present invention, the inclined correction roller unit 1 corrects the medium deflection while driving the medium to be aligned with the reference plane C, thereby enabling the medium to be aligned along the reference plane C. Step S103, driving the adjustment roller assembly to move in the first predetermined time. After the first sensor 31 detects the presence of the medium, the control mechanism starts counting. When the timing reaches the first predetermined time T1, the control mechanism controls the second driving mechanism to drive the second driving roller 22 of the adjusting roller assembly 2 to rotate, and drives the driven roller. 21 rotates to output the medium located therebetween downstream. The setting of the first predetermined time T1 may be the sum of the required time t1 and the delay time At of the medium from the first sensor 31 to the adjustment roller assembly 2, that is, T1=tl+At. The delay time At is the estimated time required for the correction roller assembly 1 to correct the medium deflection, and can be set according to the user's needs, such as 0.1 second to 1 second. Figure 7 is a cross-sectional view showing the structure of a sheet correcting mechanism according to a fourth embodiment of the present invention. This embodiment differs from the first embodiment in that the detecting assembly 3 further includes a second sensor 32. A second sensor 32 is disposed between the deflection roller assembly 1 and the adjustment roller assembly 2 for detecting the presence or absence of a medium upstream of the adjustment roller assembly 2. FIG. 8 is a flow chart of the method for correcting the deviation correcting mechanism provided in FIG. 7. The correcting method provided in this embodiment specifically includes: Step S201: Is there paper in the entrance? If yes, step S202 is performed, otherwise, it is continued to detect whether there is paper in the entrance. The control mechanism can determine whether the medium exists at the entrance according to the change of the output signal of the first sensor 31. If the control mechanism determines that the medium exists at the entrance, step S202 is performed, otherwise, it is continued to detect whether the paper exists at the entrance. Step S202, driving the correcting roller assembly to move. After the control mechanism determines that the medium exists at the entrance, the first driving mechanism 5 that drives the first driving mechanism 5 drives the correcting roller 12 to rotate, and drives the first ball 113 that is tangential thereto to roll along with the first driving roller 12 and the first driving roller 12 The medium between the balls 113 is transported downstream. During the conveyance process, the correction of the medium deflection is completed by the blocking action of the adjustment roller assembly 2 and the adjustment action of the first ball 113. Step 203: Is there a medium between the correcting roller assembly and the adjusting roller assembly at the third predetermined time? After the first sensor 31 detects the presence of the medium, the control mechanism controls the first drive mechanism 5 to drive the correcting roller assembly 1 to transport the medium to the adjustment roller assembly 2, and starts timing. At the third predetermined time, when the medium covers the detection assembly 3 When the second sensor 32 is on the surface, the control mechanism can judge whether or not the medium is present between the correction roller assembly 1 and the adjustment roller assembly 2 based on the change in the output signal of the second sensor 32. At the third predetermined time, if the control mechanism judges that there is a medium between the correcting roller assembly 1 and the regulating roller assembly 2, step S204 is performed, otherwise an alarm message is issued. The setting of the third predetermined time T3 may be the sum of the time t3 required by the medium from the first sensor 31 to the second sensor 32 and the delay time At, that is, T3 = t3 + At, wherein the delay time At is the predicted correcting roller Component 1 corrects the time required for media skew, which can be set according to user needs, such as 0.1 second to 1 second. Whether or not the medium is present between the correction roller assembly 1 and the adjustment roller assembly 2 is detected by the second sensor 31, so that the medium is not conveyed to the adjustment roller assembly 2 due to the medium being clogged by the correction roller assembly 1, etc., the adjustment roller assembly 2 idling, unable to find the problem of paper jam in time. Step S204, driving the adjustment roller assembly to move in the second predetermined time. After the second sensor 32 detects the presence of the medium, the control mechanism starts counting. When the timing reaches the second predetermined time T2, the control mechanism controls the second driving mechanism 6 to drive the second driving roller 22 of the adjusting roller assembly 2 to rotate, thereby driving the slave. The roller 21 is rotated to output the medium located therebetween downstream. The setting of the second predetermined time T2 may be the sum of the time t2 required by the medium from the second sensor 32 to the adjustment roller assembly 2 and the delay time At, that is, T2 = t2 + At. The delay time At is the time required for the correction roller assembly 1 to correct the deflection of the medium, and can be set according to the user's needs, such as 0.1 second to 1 second. Compared with the first embodiment, the second sensor 32 added between the correction roller assembly 1 and the adjustment roller assembly 2 can detect whether there is medium between the deviation roller assembly 1 and the adjustment roller assembly 2 in real time, which can effectively avoid Since the medium is not conveyed to the regulating roller assembly due to a problem such as clogging at the correcting roller assembly 1, the regulating roller assembly is idling, and the problem of prompting the alarm cannot be promptly issued, so that the correcting mechanism is more reliable. As can be seen from the above description, in the medium correcting mechanism according to the present invention, the deflecting medium front end is prevented from continuing to move by the adjusting roller, and then the back end of the medium is deflected due to the sliding of the ball of the correcting roller on the surface of the medium. The front end of the adjustment roller is rotated at the center of the circle, thereby realizing the medium deflection correction. The compact structure of the invention enables the medium to be deflected within a short transmission distance, which is more advantageous for miniaturization of the device. In each of the above embodiments, the ball assembly functions as a platen on the one hand, and allows the sheet-like medium to be free between the ball assembly and the first drive roller after the leading end of the sheet-like medium is blocked by the adjustment roller assembly. deflection. In other embodiments of the invention, the ball assembly described above may be replaced by other paper pressing mechanisms that perform the same function. In still other embodiments, the platen mechanism includes a plurality of air jet heads, each of which sprays compressed gas onto the upper surface of the sheet-like medium to cause the sheet-like medium to adhere to the top of the first drive roller. At this time, the first driving roller may drive the medium to advance, and may be relatively deflected on the first driving roller after the leading end of the sheet-like medium is blocked by the regulating roller assembly. In still other embodiments, the platen mechanism includes a platen that cooperates with the first drive roller, the platen being sufficiently cold to the pressure of the first drive roller to allow the sheet-like medium to be free after contact with the dancer roller deflection. The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A sheet medium correcting mechanism, comprising:

a correcting roller assembly comprising a first driving roller and a paper pressing mechanism cooperating with the first driving roller, wherein the sheet-like medium is deflectably located between the first driving roller and the platen mechanism;

a regulating roller assembly, located downstream of the correcting roller assembly in a medium conveying direction, comprising a second driving roller and a driven roller disposed tangentially to the second driving roller;

a sensor for detecting a medium in the media channel;

a control mechanism for controlling rotation of the first drive roller and delaying activation of rotation of the second drive roller when the sensor detects the medium.

2. The sheet medium correcting mechanism according to claim 1, wherein the platen mechanism comprises at least one ball assembly arranged along an axial direction of the first driving roller, the ball assembly including the same A free-rolling ball and ball retainer that is tangentially disposed by a drive roller.

3. The sheet-type medium correcting mechanism according to claim 2, wherein the ball holder comprises a barrel that accommodates the balls and an elastic member that biases the balls outward in the barrel The opening diameter of the barrel is smaller than the outer diameter of the ball.

4. The sheet-type medium correcting mechanism according to claim 1, further comprising a transition member for supporting the medium on a medium passage between the correcting roller assembly and the regulating roller.

5. The sheet-type medium correcting mechanism according to claim 4, wherein the transition assembly comprises a freely rotatable ball supporting the medium.

The sheet-type medium correcting mechanism according to claim 1, wherein the first driving roller is disposed perpendicularly or obliquely intersecting with the medium conveying direction.

The sheet medium correcting mechanism according to claim 2, wherein the correcting roller assembly comprises two ball assemblies.

8. The sheet-type medium correcting mechanism according to claim 1, wherein the sensor is located upstream of the correcting roller unit of the medium passage along the medium conveying direction. A sheet medium correcting mechanism according to claim 1, wherein said sensor is located between said correcting roller unit and said regulating roller unit of said medium passage. A medium processing apparatus characterized by comprising the sheet-type medium correcting mechanism according to any one of claims 1 to 9.