JP4516504B2 - Paper feeder - Google Patents

Paper feeder Download PDF

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JP4516504B2
JP4516504B2 JP2005261913A JP2005261913A JP4516504B2 JP 4516504 B2 JP4516504 B2 JP 4516504B2 JP 2005261913 A JP2005261913 A JP 2005261913A JP 2005261913 A JP2005261913 A JP 2005261913A JP 4516504 B2 JP4516504 B2 JP 4516504B2
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sheet
stacking tray
detection
vertical
feeding
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JP2007045630A (en
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智 上田
川崎  和彦
達夫 松田
真悟 高井
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株式会社リコー
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Description

  The present invention relates to a paper feeding device used in an image forming apparatus such as a printer or a copying machine.

  An air suction type paper feeding device is known as a paper feeding device used in an image forming apparatus such as a printer or a copying machine. As shown in FIG. 11, in the paper feeding device, a sheet conveying device 112 having a feeding belt 112 </ b> C is provided above the stacking tray 111, and a plurality of sheets 102 stacked on the stacking tray 111 are arranged. Among them, the sheet 102A at the top in the vertical direction (hereinafter referred to as the “uppermost sheet”) is attracted to the feeding belt 112C one by one by the air suction device 113 so that the sheet 102 is conveyed to a predetermined position. It is configured.

  An air discharge device 114 is provided on the front side of the stacking tray 111, that is, on the left side of the stacking tray 111 in FIG. 11, and a bundle of stacked sheets 102 is blown by blowing air to one end of the sheet 102. To separate. A position detection sensor 116 is provided at the other end that is not affected by the air discharge device 114 being lifted by the sheet 102. The position detection sensor 116 includes a digital sensor 116A and an upper surface position detection lever 116B. The stacking tray 111 is connected to a lifting device (not shown) and can be lifted and lowered. When the stacking tray 111 is raised and the uppermost sheet 102A comes into contact with the upper surface position detection lever 116B, the upper surface position detection lever 116B is pushed vertically upward, so that the other end of the uppermost sheet 102A detects the upper surface position. It is configured to detect that the position of the lever 116B has been reached.

  A large number of suction holes (not shown) are formed on the entire surface of the feeding belt 112C, and the sheet is adsorbed to the feeding belt 112C via the suction holes and the air suction device 113 to convey the sheet. Do.

  The operation of the conventional paper feeder is as follows. First, the stacking tray 111 is raised before the sheet feeding operation is started, and as shown in FIG. 12, the other end of the stacked sheets 102, that is, the rear end of the uppermost sheet 102A of the stacked sheets 102 is moved. It is determined whether the position detection sensor 116 is in contact with the upper surface position detection lever 116B (S101). If not detected by the position detection sensor 116 (S101: NO), the stacking tray 111 continues to rise (S102). If detected by the position detection sensor 116 (S101: YES), the raising of the stacking tray 111 is stopped (S103).

  Next, air is blown onto the sheets 102 stacked by the air discharge device 114, and a bundle of the stacked sheets 102 is separated and separated (S104). Next, the sheet 102 is adsorbed to the feeding belt 112C by the air suction device 113 (S105), and the adsorbing sheet 102 is conveyed to a predetermined position by rotating the feeding belt 112C (S106). When the sheet 102 on the stacking tray 111 is reduced by the sheet conveyance by the sheet feeding device 101, the vertical position of the uppermost sheet 102A is lowered, and the position detection sensor 116 is not detected (S101: NO), the stacking tray 111 is raised (S102). When the sheet 102 is not reduced so much, the vertical position of the uppermost sheet 102A is not lowered so much and the position detection sensor 116 is detecting the uppermost sheet 102A (S101: YES), the process starts from step S103. The steps up to S106 are repeated.

  Patent Document 1 describes a paper feeding device that can change the air blowing position and the blowing angle in accordance with the vertical position of the uppermost sheet. In this sheet feeding device, even if the sheet has a curled ridge, the stacked sheets can be separated and separated from each other by changing the air blowing position and the blowing angle in accordance with the curled ridge.

  Patent Document 2 discloses a sheet in which a portion of the uppermost sheet 202A in a state where air is blown and floated by an air discharge device 214 as shown in FIG. 13 is measured by a reflective distance measuring sensor 215. A feeding device 201 is described. The vertical position of the uppermost sheet 202A is detected from the distance measured by the distance measurement sensor 215, and the air discharge amount by the air discharge device can be changed based on the detected position.

JP-A-7-187422

JP-A-7-89625

  When the sheet is curled, the vertical position of the uppermost sheet is different between the front and rear of the sheet, that is, the left and right ends of the sheet in FIG. In the conventional sheet feeding device described above, the position of the trailing edge of the sheet is detected by the position detection sensor. Therefore, when the sheet is curled, the vertical position at the leading edge of the uppermost sheet is the vertical direction at the trailing edge of the uppermost sheet. It will be different from the position. For this reason, even if the vertical position of the rear end of the uppermost sheet is the vertical position that is capable of sucking the uppermost sheet by the suction device and is optimal for suction, the front end is not in such a position. As a result, there have been problems such as double feeding in which a plurality of sheets are conveyed at a time during a sheet feeding operation, and a suction error in which the sheets cannot be sucked to the feeding belt.

  Moreover, in patent document 1, since an air discharge position and a discharge angle are changed according to the vertical direction position of an uppermost sheet | seat, a structure becomes complicated and it costs a manufacture of an apparatus. In addition, since the optimum vertical position of the uppermost sheet that can be sucked by air varies depending on the continuous amount of the sheet and the material, when using different sheets, double feed or suction error occurs.

  Moreover, in patent document 2, the part of the uppermost sheet | seat which measures a vertical direction position with a reflection-type distance measuring sensor is the state which the sheet | seat floated by air being blown by the air discharge apparatus in order to lift and separate a sheet | seat The sheet is fluttering. For this reason, the measurement is not stable, an accurate measurement value cannot be obtained, and the optimum air discharge amount cannot be output.

  In particular, the height of the front end portion of the uppermost sheet adsorbed by the air suction device may be different between the front end portion and the rear end portion of the uppermost sheet of the sheet with the curled ridge. It is important to accurately grasp the position, particularly the height position of the tip.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that eliminates double feeding and suction mistakes by sucking the top surface sheet to a suction device even if the curl surface is attached or the top surface sheet floats during paper feeding operation. And

  In order to achieve the above object, the present invention includes a stacking tray having a substantially horizontal surface on which a plurality of stacked sheets can be placed, and a sheet adsorbing portion that adsorbs the sheets. A sheet conveying means for adsorbing and conveying the sheets one by one to the sheet feeding means, and feeding the uppermost sheet of the plurality of sheets stacked on the stacking tray by air suction A suction means for adsorbing to the sheet adsorbing portion of the sheet conveying means, and a position in the vicinity of the uppermost sheet of the plurality of sheets stacked on the stacking tray at one end of the sheet. Air discharge means for levitating the one end of the uppermost sheet and the sheet in the vicinity of the uppermost sheet and separating the one end of the plurality of sheets from each other, and driving the sheet conveying means Especially A driving means for moving the sheet adsorbing section to the sheet feeding means, an elevating means for raising and lowering the stacking tray in the vertical direction, and a portion of the one end of the uppermost sheet on the stacking tray. A position detection analog for detecting a vertical position of the other end portion of the uppermost sheet on the stacking tray in a sheet feeding device including a reference position detection sensor for detecting a vertical position A portion of the one end of the uppermost sheet on the stacking tray by driving the elevating means based on a sensor, a vertical position detection by the reference position detection sensor, and a detection position detected by the position detection analog sensor; And a control unit for raising and lowering the stacking tray so that the uppermost sheet can be sucked by the sucking unit and is in an optimum vertical position for sucking. That.

  In this case, the storage unit includes a storage unit, and before the sheet feeding operation is started, the storage unit raises the stacking tray by the lifting unit, and the one end portion of the uppermost sheet on the stacking tray is the suction unit. The vertical position detected by the position detection analog sensor when the reference position detection sensor detects that the vertical position has reached the position where the uppermost sheet can be sucked, and the stacking tray is at the reference position. The position detection analog sensor continues to detect the vertical position of the other end portion of the uppermost sheet on the stacking tray during the paper feeding operation, and the control means The calculation of the difference between the reference position data stored in the storage means and the value detected by the position detection analog sensor is continued, and the stacking tray is moved to the reference position when the difference is equal to or greater than a predetermined value. Rise Rukoto is preferable.

  Further, an input unit capable of inputting information on the sheet continuous amount and material is provided, and the storage unit can store the information on the sheet continuous amount and material input from the input unit, and before starting the sheet feeding operation. Further, the control means is configured to cause the suction means to cause the one end portion of the uppermost sheet on the stacking tray to be based on the reference position data stored in the storage means and the information on the sheet continuous amount and material. The stacking tray is lifted / lowered by the lifting / lowering means so as to be an optimum position in the vertical direction that can be sucked, and the position detection analog sensor before the sheet feeding operation starts, The vertical position of the other end portion of the uppermost sheet on the tray is detected, and the storage means overwrites and stores the detected vertical position data as the reference position data in the storage means. But Masui.

  The sheet has a substantially rectangular shape defined by a pair of sides composed of a first side and a second side and a pair of sides composed of a third side and a fourth side, The first side of the sheet forms the one end of the sheet, the second side of the sheet forms the other end of the sheet, and the air discharge means is in a first position facing the first side. And a second position facing the third side and a third position facing the fourth side, and during the paper feeding operation, the control means It is preferable to control the discharge of air from the air discharge means provided at the first position, the second position, and the third position based on the above.

  In addition, it comprises a jam error detection means for detecting the occurrence of a jam error, and the control means, when the jam error is due to double feed, the reference position as a position vertically downward by a first predetermined amount, When the jam error is caused by a suction error, it is preferable that the reference position is a position vertically above the second predetermined amount.

  Further, it is preferable that when the position detection analog sensor exceeds the detection area, the control means raises and lowers the stacking tray so as to be within the detection area of the position detection analog sensor.

  According to the paper feeding device of the first and second aspects of the present invention, the position detection analog sensor for detecting the vertical position of the other end portion with respect to one end of the uppermost sheet on the stacking tray, and the reference position Based on the detection of the vertical position by the detection sensor and the detection position detected by the position detection analog sensor, the lifting and lowering means is driven so that one end portion of the uppermost sheet on the stacking tray can suck the uppermost sheet by the suction means; Control means for raising and lowering the stacking tray so that the vertical position is optimal for suction, even if the sheet is curled, the position detection analog sensor can By detecting the vertical position of the other end portion with respect to one end of the uppermost sheet, the vertical position of the one end portion of the uppermost sheet on the stacking tray is detected. , It can be optimized vertical position in inhalable and sucking the uppermost sheet by the suction device.

  Also, by providing two types of sensors, a reference position detection sensor and a position detection analog sensor, the vertical position of one end portion of the uppermost sheet on the stacking tray can be accurately grasped as described above. Therefore, the paper feeding device can have a simple configuration, and the cost for manufacturing the paper feeding device can be reduced.

  According to the sheet feeding device of the third aspect of the present invention, the sheet feeding device includes an input unit capable of inputting information on the sheet continuous amount and material, and the storage unit stores information on the sheet continuous amount and material input from the input unit. Before starting the paper feeding operation, the control unit sucks one end portion of the uppermost sheet on the stacking tray based on the reference position data stored in the storage unit and the information on the sheet continuous amount and the material. The stacking tray is moved up and down by the lifting and lowering means so that the vertical position can be sucked by the means, and the position detection analog sensor before the paper feeding operation starts, The vertical position of the other end portion of the top sheet is detected, and the storage means overwrites and stores the detected vertical position data as reference position data in the storage means. The vertical position of the end portions of the face sheets, in consideration of the sheet basis weight and material, can be optimized vertical position in inhalable and sucking the uppermost sheet by the suction device.

  According to the sheet feeding device of the fourth aspect of the present invention, the air discharge means includes the first position facing the first side, the second position facing the third side, and the fourth side. The control unit is provided at the first position, the second position, and the third position based on the continuous amount information of the sheet during the sheet feeding operation. Since the discharge of air from the air discharge means is controlled, optimal air discharge according to the sheet continuous amount can be performed.

  According to the paper feeder of claim 5 of the present invention, it is provided with the jam error detecting means for detecting the occurrence of the jam error, and the control means sets the reference position as the first position when the jam error is caused by double feeding. When the jam error is caused by a suction error, the reference position is set to the position vertically above by the second predetermined amount. Therefore, the stacking tray is jammed according to the jam error that has occurred. An optimum position where no error occurs can be set, and subsequent occurrence of a jam error can be prevented.

  According to the sheet feeding device of the sixth aspect of the present invention, the sheet feeding operation can be performed by raising and lowering the stacking tray even in response to a large curled sheet exceeding the detection area of the position detection analog sensor. it can.

  A sheet feeding device according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the sheet feeding device 1 includes a stacking tray 11, a sheet conveying device 12, a suction device 13, an air discharge device 14, a driving device 17, an elevating device 18, and a reference position detection sensor 15. , A position detection analog sensor 16, a control device 19, a storage device 20, an input device 21, and a jam error detection device 22. The sheet conveyance device 12, the suction device 13, the air discharge device 14, the drive device 17, the lifting device 18, the control device 19, the storage device 20, the input device 21, and the jam error detection device 22 are respectively a sheet conveyance device, a suction device, and an air device. It corresponds to a discharge means, a drive means, an elevating means, a control means, a storage means, an input means, and a jam error detection means. The stacking tray 11 has a substantially horizontal surface 11A, on which a plurality of stacked sheets 2 can be placed. The stacking tray 11 is connected to a lifting device 18 connected to the control device 19 so that the loading tray 11 can be lifted and lowered by driving the lifting device 18. The sheet conveying device 12 is drivingly coupled to a driving device 17 connected to a control device 19 and includes two rollers 12A and 12B and a feeding belt 12C that spans the two rollers 12A and 12B. As shown in FIG. 3 or FIG. 4, the feeding belt 12C is formed with a large number of suction holes 12a as a whole, and a space defined by the inner periphery of the feeding belt 12C is formed from the suction holes 12a. A suction device 13 (FIG. 1) is provided for sucking air into a space defined by the inner periphery of the feeding belt 12C. The feeding belt 12C corresponds to an adsorption portion.

  The suction device 13 is connected to the control device 19, and is at the top in the vertical direction among the plurality of sheets 2 stacked on the stacking tray 11 by sucking air under the control of the control device 19. Sheets 2A (hereinafter referred to as “uppermost sheet”) can be adsorbed to the feeding belt 12C one by one, and the drive device 17 is driven by the control of the control device 19 while the sheets 2 are adsorbed. By rotating the belt 12C, the sheet 2 can be conveyed to a position where a sheet receiving device (not shown) is disposed. Here, the paper feeding device means a device that feeds the sheet 2 to a photosensitive drum or the like (not shown) provided inside a printer or the like.

  The sheet 2 is an abbreviation defined by a pair of sides composed of a first side 2B and a second side 2C, and a pair of sides composed of a third side 2D and a fourth side 2E (FIG. 3). It has a rectangular shape. The third side 2D and the fourth side 2E of the sheet 2 are oriented in the direction connecting the two rollers 12A and 12B of the sheet conveying device 12, respectively. The first side 2B of the sheet 2 is shown in FIG. Located at the left end, the second side 2C of the sheet 2 is positioned at the right end in FIG. The third side 2D of the sheet 2 is a portion that appears on the front side in FIG. 1, and the fourth side 2E (FIG. 3) of the sheet 2 is located at the back of the page in FIG. Absent. The first side 2B of the sheet 2 corresponds to one end of the sheet 2, and the second side 2C of the sheet 2 corresponds to the other end of the sheet 2.

  As shown in FIGS. 3 and 4, the air discharge device 14 is located near one end of the uppermost sheet 2 </ b> A and is opposed to the first position facing the first side 2 </ b> B and the third side 2 </ b> D. And a third position opposite to the fourth side 2E, respectively, and are connected to the control device 19, respectively. The air discharge device 14 blows air to one end portion of the sheet 2 at a position in the vicinity of the uppermost sheet 2A among the plurality of sheets 2 stacked on the stacking tray 11, so that the uppermost sheet 2A and the uppermost sheet 2A. One end portion of the sheet 2 in the vicinity of the upper surface sheet 2A can be levitated, and one end of the plurality of sheets 2 can be separated from each other. The direction in which air is blown, that is, the discharge direction is fixed, but ON / OFF switching of the air discharge is independently performed by each of the air discharge devices 14 at the first position, the second position, and the third position. It is configured to be able to be done. This switching control is performed by the control device 19 on the basis of the continuous amount of the sheet 2 described later.

  The reference position detection sensor 15 includes a digital sensor 15 </ b> A such as an optical photosensor with an actuator and is connected to the control device 19. As shown in FIG. 1, the reference position detection sensor 15 includes a detection lever 15 </ b> B and is provided at a position substantially vertically above one end portion of the uppermost sheet 2 </ b> A on the stacking tray 11. The detection lever 15B can be rotated around the digital sensor 15A, and the detection surface of the digital sensor 15A is exposed by the rotation of the detection lever 15B. In the present embodiment, by raising the stacking tray 11, the detection lever 15B comes into contact with the uppermost sheet 2A and rotates vertically upward, and the detection surface of the digital sensor 15A is fully exposed. The end on the first side 2B side of the top sheet 2A is determined to be the optimum vertical position for suction of the top sheet 2A by the suction device 13. More specifically, before the sheet feeding operation starts, the detection lever 15B contacts the uppermost sheet 2A and is rotated vertically upward to detect the position when the detection surface of the digital sensor 15A is completely exposed. The control device 19 recognizes that one end portion of the uppermost sheet 2A on the stacking tray 11 is in the vertical position where the uppermost sheet 2A can be sucked by the suction device 13 and is optimal for suction. It is configured to be able to.

  The position detection analog sensor 16 is connected to the control device 19, and, as shown in FIG. 1, an analog sensor unit 16A composed of a reflective or transmissive CCD, a linear sensor, an analog sensor for analog voltage output, etc. And a position detection lever 16B. The upper surface position detection lever 16B has one end bent into a substantially L shape, and the other end bent into a substantially L shape. The upper surface position detection lever 16B is movable vertically and vertically, and one end portion is always in contact with the second side 2C which is the other end portion of the uppermost sheet 2A. Therefore, when the number of sheets 2 stacked on the stacking tray 11 decreases, the upper surface position detection lever 16B is configured to move vertically downward.

  An analog sensor portion 16A is disposed at a position facing the other end of the upper surface position detection lever 16B, and continuously detects the vertical position of the other end of the upper surface position detection lever 16B. The control device 19 always recognizes the vertical position of the other end of the upper surface position detection lever 16B, thereby recognizing the vertical position of the second side 2C portion of the uppermost sheet 2A, that is, the other end portion. be able to. Specifically, the analog sensor unit 16A has a detection area 16C, and the uppermost sheet 2A depends on which part of the detection area 16C the upper end of the other end of the upper surface position detection lever 16B intersects when viewed from the horizontal direction. The vertical position of the end of the second side 2C is detected. Thus, the vertical position of the first side 2B which is one end of the uppermost sheet 2A which is not lifted by air can be recognized.

  The input device 21 is connected to the control device 19 and has operation buttons and a display unit provided on an operation panel (not shown). That is, various types of information, for example, information about the sheet weight and the material of the sheet 2 can be manually input. The sheet continuous amount can be input in several stages, for example, “55-90 (kg)”.

  The storage device 20 stores various data. That is, information input from the input device 21, for example, information regarding the sheet continuous amount and the material of the sheet 2 is stored as data, and the stacking tray 11 is moved by the lifting device 18 before starting the sheet feeding operation, as will be described later. The reference position indicates that the portion of one end of the uppermost sheet 2A on the stacking tray 11, that is, the portion of the first side 2B has reached the vertical position where the uppermost sheet 2A can be sucked by the suction device 13 The vertical position detected by the position detection analog sensor 16 when the detection sensor 15 detects is stored as reference position data indicating that the stacking tray 11 is at the reference position, or the detected vertical position data is stored as the reference position. The data can be further overwritten and stored as data.

  The paper feeder 1 is provided with an automatic size recognition device (not shown) that automatically recognizes the size of the paper. The automatic size recognition device can automatically recognize when the sheet 2 has a fixed shape. When the sheet 2 is non-standard free, it can be set by inputting the size in units of 1 mm from the input device 21. Further, the paper feeding device 1 is provided with a jam error detection 22 for detecting the occurrence of a jam error as shown in FIG. The jam error detection device 22 detects a jam error due to double feeding or suction error. Further, the jam error detection device 22 is connected to the control device 19, and the control device 19 determines whether the jam error is due to double feeding based on a signal from the jam error detection device 22 or due to a suction error. Distinguish whether there is. The jam error detection device 22 includes a photo sensor 22A and a pair of photo sensors 22B including a light emitting unit and a light receiving unit. The photo sensor 22A is provided downstream in the paper transport direction, and the pair of photo sensors 22B is provided further downstream in the paper transport direction than the photo sensor 22A. The photosensor 22A detects a suction error, and the photosensor 22B detects double feed. Specifically, the photosensor 22A detects the time from when the driving device 17 starts driving until it reaches the photosensor 22A. The control device 19 determines that a suction error has occurred when the time detected by the photosensor 22A exceeds a predetermined time. In addition, the photosensor 22B detects the amount of light transmitted by the light receiving unit. The control device 19 determines double feeding when the amount of transmission detected by the photosensor 22B does not reach a predetermined value. In addition, the detection of the suction error and the double feed may be performed only by the pair of photosensors 22B.

  In the embodiment of the present invention, the reference position sensor 15 and the position detection analog sensor 16 always detect the uppermost sheet 2A.

  Next, the operation of the sheet feeding device 1 will be described based on the flowchart of FIG. First, before starting the paper feeding operation, the stacking tray 11 is raised as shown in FIG. 1, and one end portion of the uppermost sheet 2A of the stacked sheets 2 is moved to the detection lever 15B of the reference position detection sensor 15. By contacting and rotating the detection lever 15B, one end portion of the uppermost sheet 2A on the stacking tray 11 can be sucked by the suction device 13 and is in a vertical position optimal for suction. Is detected (S1-1). If it is not detected by the reference position detection sensor 15 (S1-1: NO), the stacking tray 11 is continuously raised (S1-2). If detected by the reference position detection sensor 15 (S1-1: YES), the raising of the stacking tray 11 is stopped (S1-3).

  Next, the position detection analog sensor 16 detects the vertical position of the other end portion of the uppermost sheet 2A on the stacking tray 11 (S1-4), and the detected position in the vertical direction is set to the reference position of the stacking tray 11. That is, it is stored as reference position data indicating that one end portion of the uppermost sheet 2A on the stacking tray 11 is in the vertical position optimal for suctioning the uppermost sheet 2A by the suction device 13 (see FIG. S1-5). For convenience of explanation, the value of the stored data is “A”.

  Here, the optimum vertical position is an optimum position for sucking the paper, but the continuous quantity of paper is not taken into consideration. Therefore, fine adjustment is required to lower the optimum vertical direction position when sucking thin paper and to raise the optimum vertical position when sucking thick paper. Therefore, the control device 19 performs fine adjustment by moving the stacking tray 11 up and down based on the reference position data and sheet information input to the storage device 20 (S1-6). At that time, the vertical position of the edge on the side 2C of the uppermost sheet 2A on the stacking tray 11 detected by the position detection analog sensor 16 is overwritten and stored in the storage device 20 as reference position data.

  Next, the control device 19 selects an air discharge device 14 that should discharge air from the air discharge devices 14 provided at the first position, the second position, and the third position based on the sheet continuous quantity information. Then, the discharge of air to one end portion of the uppermost sheet 2A on the stacking tray 11 is started (S1-7). More specifically, for example, when the sheet 2 is thin paper, as shown in FIG. 3, only the air discharge device 14 in the first position is selected and controlled to discharge air, When 2 is a cardboard, as shown in FIG. 4, the air discharge devices 14 provided at all positions are selected and controlled to discharge air. In addition, air discharge by the air discharge apparatus 14 is not performed between the above-mentioned step S1-1 to S1-6. Air is discharged from step S1-7 onward until the printing operation is completed. However, it stops when an error occurs during the printing operation.

  Next, as shown in FIG. 2, air is blown onto the sheets 2 stacked by the air discharge device 14, and a bundle of stacked sheets 2 is separated and separated (S1-8). Next, the sheet 2 is attracted to the feeding belt 12C by the suction device 13 (S1-9), and the first uppermost sheet 2A sucked by rotating the feeding belt 12C is provided in the sheet feeding device. To the predetermined position (S1-10).

  Next, it is determined whether or not a jam error has occurred (S1-11). If a jam error has occurred (S1-11: YES), it is determined whether the detected jam error is due to double feeding (S1-12) or a suction error (S1-13). If it is based on double feed (S1-12: YES), the reference position data stored in the storage device 20 is converted into data at a position vertically below the reference position by a first predetermined amount α. Overwriting is performed (S1-14, S1-5). If it is due to a suction error (S1-13: YES), the data of the reference position stored in the storage device 20 is changed to the data of the position vertically above the reference position by a second predetermined amount β. Overwriting is performed (S1-15, S1-5). Here, α and β are amounts determined in advance depending on the continuous amount and material of the sheet 2.

  If no jam error has occurred in determining whether or not a jam error has occurred (S1-11: NO), the position detection analog sensor 16 detects the other end of the uppermost sheet 2A on the stacking tray 11. The vertical position is continuously detected (S1-16). Here, it is assumed that the data value of the vertical position detected for convenience of explanation is “B”. Then, the control device 19 continues to calculate the difference value between the value A of the reference position data stored in the storage device 20 and the value B detected by the position detection analog sensor 16, and the difference value and the predetermined value C (S1-17). Here, the predetermined value C is a predetermined amount in consideration of the continuous amount and material of the sheet 2.

  When the difference value is less than the predetermined value C (S1-17: NO), the process returns to step S1-8 to separate the sheet 2 in order to convey the next second uppermost sheet 2A. (S1-8). When the difference value is equal to or greater than the predetermined value C (S1-17: YES), the stacking tray 11 is raised by the difference value (S1-18), and the stacking tray 11 is stopped from being raised ( S1-19) In order to convey the next uppermost sheet 2A, the process returns to step S1-8 and the sheet 2 is separated (S1-8). Note that steps S1-1 to S1-7 described above correspond to the steps before starting the paper feeding operation. Steps S1-8 to S1-19 described above correspond to processes during the paper feeding operation.

  The reference position detection sensor 15 is disposed at a position for detecting one end portion of the uppermost sheet 2A. During the paper feeding operation, the position detection analog sensor 16 detects the other end of the uppermost sheet 2A on the stacking tray 11. Since the vertical position of this portion is detected, even if the sheet 2 has a curl ridge, the one end portion of the uppermost sheet 2A can be set to the optimum vertical position for suction by the suction device 13. In addition, since it has a simple configuration having two sensors, that is, the reference position detection sensor 15 and the position detection analog sensor 16, the cost for manufacturing the sheet feeding device 1 can be reduced.

  Further, since the reference position data corresponding to the continuous amount and material of the sheet 2 is stored in the storage device 20, the uppermost sheet 2A is placed at the optimum position for air suction by the suction device 13 in consideration of the continuous amount and material of the sheet 2. Can be positioned. For this reason, the sheet can be reliably adsorbed without changing the air discharge position, discharge angle, and discharge amount.

  Also, when a jam error is detected, the case is classified according to whether the jam error is due to double feeding or due to a suction error. If the jam error is due to double feeding, the reference position is set to the first predetermined amount α. Since the vertical position of the uppermost sheet 2A is lowered by a certain amount, the suction force of the suction device 13 is weakened, and a plurality of sheets 2 can be prevented from being sucked simultaneously. Even if the curl is attached to, the paper can be fed without double feeding. When the jam error is due to a suction error, the reference position is set to a position vertically above by the second predetermined amount β, so that the suction force of the suction device 13 is increased by raising the sheet top surface position by a certain amount, The sheet can be easily adsorbed, and even if the sheet 2 has a curl flaw, it can be fed without causing an adsorption error.

  Next, a paper feeding device according to a second embodiment of the present invention will be described. The sheet feeding device according to the second embodiment is for detecting a sheet having a large curl that exceeds the detection area of the position detection analog sensor.

  As described above, the analog sensor unit 16A has an end portion on the second side 2C side of the uppermost sheet 2A depending on which part of the detection region 16C the upper end of the other end of the upper surface position detection lever 16B intersects with the horizontal direction. The vertical position of is detected.

  However, for example, as shown in FIG. 6, when the curl amount of the sheet 2 is large downward, the reference position detection sensor 15 detects a position considerably lower than the actual vertical position of the uppermost sheet 2A. Therefore, the stacking tray 11 and the upper surface position detection lever 16B driven by the stacking tray 11 are raised to a position considerably higher than usual. As a result, if the upper end of the other end of the upper surface position detection lever 16B rises to a position where it does not intersect the detection area 16C in the horizontal direction, the detection result will not differ any more, and the difference (AB) described above. And the predetermined value C cannot be controlled.

  Therefore, in the present embodiment, when the upper end of the other end of the upper surface position detection lever 16B has risen to a position that does not intersect the detection region 16C in the horizontal direction, as shown in FIG. Control is performed to raise and lower the stacking tray 11 so that the upper end of the other end of 16B intersects the detection region 16C in the horizontal direction.

  For example, as shown in FIG. 8, when the curl amount of the sheet 2 is large upward, the reference position detection sensor 15 detects a position considerably higher than the actual vertical position of the uppermost sheet 2A. It becomes. At this time, if the stacking tray 11 and the upper surface position detection lever 16B driven by the stacking tray 11 are raised only to a position considerably lower than usual, the analog sensor unit 16A detects the upper surface position detection lever 16B. Therefore, the control by comparing the difference (A−B) with the predetermined value C cannot be performed.

  Therefore, in the present embodiment, when the upper end of the other end of the upper surface position detection lever 16B does not reach the lower end of the detection region 16C, the upper surface position detection lever 16B is moved to the lower end of the detection region 16C as shown in FIG. Further, the stacking tray 11 is raised so as to be at a position higher by a specified amount Ha (mm). The specified amount Ha (mm) is a position where the change amount of the output of the analog sensor unit 16A can be detected when the sheets 2 of the stacking tray 11 are reduced and the upper surface position detection lever 16B is lowered during continuous feeding.

  Next, the operation of the sheet feeding device 1 will be described based on the flowchart of FIG. Here, the case where a transparent analog sensor with an analog voltage output of 0 to 5 (V) is used as the position detection analog sensor 16 will be described.

  First, before starting the paper feeding operation, the stacking tray 11 is raised as shown in FIG. 1, and one end portion of the uppermost sheet 2A of the stacked sheets 2 is moved to the detection lever 15B of the reference position detection sensor 15. When the contact lever is rotated and the detection lever 15B is rotated, one end portion of the uppermost sheet 2A on the stacking tray 11 can be sucked by the suction device 13 and is at the optimum vertical position for suction. It is determined whether or not this is detected (S2-1). If it is not detected by the reference position detection sensor 15 (S2-1: NO), the stacking tray 11 is continuously raised (S2-2). When detected by the reference position detection sensor 15 (S2-1: YES), the raising of the stacking tray 11 is stopped (S2-3).

  Next, the position detection analog sensor 16 detects the vertical position of the other end portion of the uppermost sheet 2A on the stacking tray 11 (S2-4).

Here, it is determined whether or not the output V 0 of the position detection analog sensor 16 in step S2-4 is V 0 <1 (V) (S2-5).

When V 0 <1 (V) (S2-5: YES), since the curl amount of the sheet 2 is large upward, it is determined that the analog sensor unit 16A cannot detect the upper surface position detection lever 16B, and position detection is performed. The stacking tray 11 is raised until the output V 0 of the analog sensor 16 becomes V 0 = V Ha (V) (S2-6, S2-7). V Ha (V) is an output voltage at a position that can be detected at a portion above the lower end portion of the detection region of the analog sensor unit 16A by a specified amount Ha (mm). When V 0 = V Ha (V), the stacking tray 11 is stopped (S2-11), and the vertical position detected by the position detection analog sensor 16 is set to the reference position. That is, it is stored as reference position data indicating that one end portion of the uppermost sheet 2A on the stacking tray 11 is in the vertical position optimal for suctioning the uppermost sheet 2A by the suction device 13 (see FIG. S2-12). At this time, the value of the stored reference position data is “A”.

On the other hand, if V 0 > 1 (V) (S2-5: NO), it is next determined whether or not V 0 > 4 (V) (S2-8). When V 0 > 4 (V) (S2-8: YES), the curl amount of the sheet 2 is large downward, so that it is determined that the analog sensor unit 16A completely blocks the upper surface position detection lever 16B. The stacking tray 11 is lowered until the output of the position detection analog sensor 16 becomes V 0 = 4 (V) (S2-9, S2-10). When V 0 = 4 (V), the stacking tray 11 is stopped (S2-11), and the vertical position detected by the position detection analog sensor 16 is at the reference position. That is, it is stored as reference position data A indicating that one end portion of the uppermost sheet 2A on the stacking tray 11 can be sucked by the suction device 13 and is at the optimum vertical position for sucking ( S2-12). If V 0 <4 (V) (S2-8: NO), the operations of steps S2-11 and S2-12 are executed.

  Thereafter, the operations from step S2-13 to S2-26 are executed. Note that the operations from Steps S2-13 to S2-26 are the same as the operations from S1-6 to S1-17 in the first embodiment, and thus description thereof is omitted.

  The sheet feeding device according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, the reference position detection sensor 15 is configured by a digital sensor 15A such as an optical photosensor with an actuator, but an analog sensor may be used.

  The vertical position of the other end of the upper surface position detection lever 16B is detected by the position detection analog sensor 16, but the present invention is not limited to this. For example, the height position of the stacking tray 11 without the upper surface position detection lever 16B being provided. Alternatively, the vertical position of the stacked uppermost sheet 2A may be directly detected by an analog sensor.

  The paper feeding device of the present invention is in the field of electrostatic recording devices such as electrophotographic printers and copiers, and is particularly applicable to paper feeding devices that require a reduction in manufacturing costs.

1 is a schematic side view showing a paper feeding device according to an embodiment of the present invention. FIG. 4 is a schematic side view showing a state in which the uppermost sheet is sucked by the feeding belt in the sheet feeding device according to the embodiment of the present invention. FIG. 3 is a schematic front view illustrating a state in which the uppermost sheet is sucked by the feeding belt in the sheet feeding device according to the embodiment of the present invention. FIG. 3 is a schematic front view illustrating a state in which the uppermost sheet is sucked by the feeding belt in the sheet feeding device according to the embodiment of the present invention. 6 is a flowchart showing the operation of the sheet feeding device according to the embodiment of the present invention. FIG. 9 is a schematic side view when a sheet having a large downward curl amount is used in a sheet feeding device according to another embodiment of the present invention (when out of the detection area of the position detection analog sensor). FIG. 10 is a schematic side view showing an operation of the sheet feeding device when a sheet having a large downward curl amount is used in the sheet feeding device according to another embodiment of the present invention. FIG. 9 is a schematic side view when a sheet with a large upward curl amount is used in a sheet feeding device according to another embodiment of the present invention (when out of the detection region of the position detection analog sensor). FIG. 10 is a schematic side view showing the operation of the sheet feeding device when a sheet having a large upward curl amount is used in the sheet feeding device according to another embodiment of the present invention. 9 is a flowchart showing the operation of a sheet feeding device according to another embodiment of the present invention. FIG. 6 is a schematic side view showing a state in which the uppermost sheet is sucked by a feeding belt in a conventional sheet feeding device. 6 is a flowchart illustrating the operation of a conventional paper feeding device. FIG. 6 is a schematic side view showing a state in which the uppermost sheet is sucked by a feeding belt in a conventional sheet feeding device.

Explanation of symbols

1 is a sheet feeding device, 2 is a sheet, 2A is a top sheet, 2B is a first side, 2C is a second side, 2D is a third side, 2E is a fourth side, 11 is a stacking tray, 11A Is a substantially horizontal surface, 12 is a sheet conveying device, 12C is a feeding belt, 13 is a suction device, 14 is an air discharge device, 15 is a reference position detection sensor, 16 is a position detection analog sensor, 17 is a drive device, and 18 is A lifting device, 19 is a control device, 20 is a storage device, 21 is an input device, and 22 is a jam error detection device.

Claims (6)

  1. A stacking tray having a substantially horizontal surface on which a plurality of stacked sheets can be placed;
    A sheet conveying unit that adsorbs the sheet, adsorbs and conveys the sheet one by one to the sheet adsorbing unit, and feeds the sheet to a sheet receiving unit;
    A suction unit for sucking the uppermost sheet of the plurality of sheets stacked on the stacking tray to the sheet suction unit of the sheet transport unit by air suction;
    The uppermost sheet and the sheet in the vicinity of the uppermost sheet are blown by air to a position near the uppermost sheet of the plurality of sheets stacked on the stacking tray. Air discharge means for levitating one end and separating the one end of the plurality of sheets from each other;
    Driving means for moving the sheet adsorbing unit to the sheet feeding means by driving the sheet conveying means;
    Elevating means for elevating the stacking tray in the vertical direction;
    A reference position detection sensor for detecting a vertical position of the one end portion of the uppermost sheet on the stacking tray;
    A position detection analog sensor for detecting the vertical position of the other end portion of the uppermost sheet on the stacking tray with respect to the one end;
    Based on the detection of the vertical position by the reference position detection sensor and the detection position detected by the position detection analog sensor, the lifting means is driven so that the one end portion of the uppermost sheet on the stacking tray is sucked. And a control means for raising and lowering the stacking tray so that the uppermost sheet can be sucked by the means and is in a vertical position optimal for suction.
  2. A storage means,
    Before the sheet feeding operation is started, the storage unit can lift the stacking tray by the lifting unit, and the one end portion of the top sheet on the stacking tray can suck the top sheet by the suction unit. Storing the vertical position detected by the position detection analog sensor when the reference position detection sensor detects that the stacking tray has reached the vertical position as reference position data indicating that the stacking tray is at the reference position;
    During the sheet feeding operation, the position detection analog sensor continues to detect the vertical position of the other end portion of the uppermost sheet on the stacking tray, and the control means stores the reference position stored in the storage means. The value of the difference between the data and the value detected by the position detection analog sensor is continuously calculated, and the stacking tray is raised to the reference position when the value of the difference is a predetermined value or more. Item 2. The sheet feeding device according to Item 1.
  3. Provided with input means that can input information about sheet weight and material,
    The storage means can store the information on the sheet weight and material input from the input means,
    Before starting the sheet feeding operation, the control unit is configured to determine the portion of the one end of the uppermost sheet on the stacking tray based on the reference position data stored in the storage unit and the information on the sheet continuous amount and material. Elevating and lowering the stacking tray by the elevating and lowering means so as to be in the optimum vertical position that can be sucked by the suction means,
    The position detection analog sensor detects the vertical position of the other end portion of the uppermost sheet on the stacking tray when the stacking tray is at the optimum position before the sheet feeding operation is started, 3. The sheet feeding device according to claim 2, wherein the means overwrites and stores the detected vertical position data as the reference position data in the storage means.
  4. The sheet has a substantially rectangular shape defined by a pair of sides composed of a first side and a second side and a pair of sides composed of a third side and a fourth side, The first side forms the one end of the sheet, the second side of the sheet forms the other end of the sheet,
    The air discharge means is provided at a first position facing the first side, a second position facing the third side, and a third position facing the fourth side, respectively. And
    During the sheet feeding operation, the control unit controls the discharge of air from the air discharge unit provided at the first position, the second position, and the third position based on the continuous amount information of the sheet. The paper feeding device according to claim 2 or claim 3, wherein
  5. Jam error detection means for detecting the occurrence of a jam error,
    The control means sets the reference position vertically downward by a first predetermined amount when the jam error is due to double feeding, and sets the reference position as the second position when the jam error is due to a suction error. The sheet feeding device according to any one of claims 2 to 4, wherein the sheet feeding device is positioned vertically above a predetermined amount.
  6. The control means raises and lowers the stacking tray so that the position detection analog sensor exceeds a detection area so as to be within the detection area of the position detection analog sensor. Item 6. The sheet feeding device according to any one of Items 5 to 6.
JP2005261913A 2004-09-13 2005-09-09 Paper feeder Active JP4516504B2 (en)

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US8132806B2 (en) 2010-03-10 2012-03-13 Ricoh Company, Limited Sheet feeding device and image forming apparatus
US8141865B2 (en) 2010-02-03 2012-03-27 Ricoh Company, Limited Sheet feeding device and image forming apparatus with different separating and suctioning operational timings
US8177218B2 (en) 2009-12-22 2012-05-15 Ricoh Company, Limited Sheet feeding device and image forming apparatus
US8465014B2 (en) 2010-02-04 2013-06-18 Ricoh Company, Limited Feeding device and image forming apparatus

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JP4952523B2 (en) * 2007-11-09 2012-06-13 コニカミノルタビジネステクノロジーズ株式会社 Paper feeding device and image forming apparatus
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US8141865B2 (en) 2010-02-03 2012-03-27 Ricoh Company, Limited Sheet feeding device and image forming apparatus with different separating and suctioning operational timings
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