JP5774834B2 - Paper alignment device - Google Patents

Description

  The present invention relates to a sheet aligning apparatus for a post-processing apparatus that receives and aligns printed sheets discharged from image forming apparatuses such as various printing machines and copying machines.

  In recent years, for example, post-processing (stapling processing, punching (drilling)) on paper after image formation discharged from various printing machines such as inkjet printers, laser beam printers, and stencil printing apparatuses, and image forming apparatuses such as copying machines. ) Processing, folding processing, sorting processing, bookbinding processing, etc.) are increasing in demand, and various types are provided.

  This type of post-processing apparatus is configured to align a sheet with an alignment reference position (center position or side position) as a reference by an alignment unit such as an alignment fence before or after post-processing the image-formed sheet. It is placed on the loading place. As a post-processing device having such a paper alignment function, for example, a device disclosed in Patent Document 1 below is known.

  A post-processing apparatus disclosed in Patent Document 1 below is an apparatus that includes an alignment unit that is connected to an image forming apparatus and performs alignment in a main scanning direction by using an alignment plate with respect to a recording sheet sent from the image forming apparatus. . Then, a control unit that receives either the image forming position correction information for each paper feed tray on the image forming apparatus side or the recording paper edge detection information from the image forming apparatus, and determines the alignment position with reference to the information As a result, the high speed of the alignment operation is enhanced with the minimum necessary movement distance as the alignment plate retracting position in accordance with the output position from the image forming apparatus.

JP 2010-1110 A

  By the way, the post-processing device of Patent Document 1 is a method of controlling the alignment unit based on the paper position information of either image forming position correction information or recording paper edge detection information for each paper feed tray of the image forming apparatus. . For this reason, the paper position in the main scanning direction may not necessarily match because the paper set position of the paper feed tray and the positional deviation due to the skew during conveyance occur.

  Therefore, as shown in FIG. 9, the retracting position of the aligning means must be a position that takes into account a distance (about 10 mm to 20 mm) in consideration of the mismatch with respect to the paper side edge in advance. It was not possible to sufficiently cope with the increase in transport distance due to the increase in speed and diversification of peripheral devices.

  Accordingly, the present invention has been made in view of the above-described problems, and can cope with an increase in the conveyance speed and can align sheets without being influenced by a positional deviation of sheets conveyed after image formation. An object of the present invention is to provide a sheet aligning device.

In order to achieve the above-described object, the sheet aligning apparatus according to claim 1 includes a pair of conveying rollers for nipping and conveying the sheet discharged from the image forming apparatus along the conveying direction X, and the pair of conveying rollers when conveying the sheet. A sheet conveying means having a roller-sliding mechanism that slides along a sheet width direction Y orthogonal to the conveying direction X;
An aligning unit comprising a pair of aligning plates, reciprocally moving in the sheet width direction Y and conveyed by the sheet conveying unit at a sheet receiving position, and abutting against the side edge of the sheet to align in the width direction When,
Arranged before the aligning means in the transport direction X, between the side edge of the paper when the paper reaches the aligning means and the paper contact surface of the aligning plate at the paper receiving position Side edge detection means for detecting a side edge of the paper conveyed by the paper conveyance means with reference to an edge detection position set so that the distance in the paper width direction Y is the minimum alignment distance necessary for alignment; ,
When the side edge detection means does not detect the side edge of the sheet at the edge detection position, the pair of conveying rollers is slid in the sheet width direction Y from the original position, and the side edge of the sheet is the edge. A control unit for driving and controlling the roller pair sliding mechanism to be detected at a detection position;
It is provided with.

In the sheet aligning device according to the present invention, when the sheet from the image forming apparatus is conveyed toward the aligning unit, the side edge of the sheet is detected when the side edge of the sheet is not detected at the edge detection position by the side edge detecting unit. By driving and controlling the roller pair sliding mechanism so that the conveyance roller pair is slid in the paper width direction Y until it is detected at the edge detection position, the paper conveyance direction is deviated from the paper width conveyance direction Y. However, since the sheet can be transported to the sheet receiving position that maintains the minimum alignment distance necessary for alignment in advance, the alignment time can be increased while ensuring alignment. This the effect that Do remarkable when such various post-processing apparatus is connected between the image forming apparatus and the device. Furthermore, since the alignment distance of the alignment means is controlled to a minimum, there is an effect of reducing noise generated by hitting the sheet during alignment . Further, since the alignment plate is made to wait in advance at the sheet receiving position, the moving distance of the alignment means is shortened, the life of the parts is extended, and the maintenance cost can be reduced.

It is explanatory drawing which shows the example of installation of the paper aligning apparatus which concerns on this invention. It is explanatory drawing which shows schematic structure of the paper alignment apparatus of the 1st form which concerns on this invention. It is a functional block diagram which shows the system configuration | structure of the control part in the same apparatus. (A)-(c) It is explanatory drawing which shows a series of drive states at the time of the paper alignment process in the apparatus. It is explanatory drawing which shows schematic structure of the paper aligning apparatus of the 2nd form which concerns on this invention. (A) It is explanatory drawing which shows the structure of the paper conveyance means in the apparatus. (B) It is explanatory drawing which shows the state after the sliding in the conveyance means. It is a functional block diagram which shows the system configuration | structure of the control part in the same apparatus. (A)-(c) It is explanatory drawing which shows a series of drive states at the time of the paper alignment process in the apparatus. It is explanatory drawing which shows the paper receiving position of the conventional aligning device.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In addition, the present invention is not limited by this embodiment, and all other forms, examples, operation techniques, and the like that can be implemented by those skilled in the art based on this form are included in the scope of the present invention. .

  As shown in FIG. 1, the sheet aligning apparatus 1 according to the present invention is provided at a subsequent stage of the image forming apparatus 100 or a post-processing apparatus group 300 (including a single unit) for post-processing the sheet P after image formation. The paper transport mechanism is arranged and transported in front of various post-processing means for post-processing printed paper P (stapling processing, punching processing, folding processing, sorting processing, bookbinding processing, etc.). This is an apparatus that performs post-processing after aligning the sheet P according to the alignment reference. In the following description, an example will be described in which a post-processing device 200 on which the sheet aligning device 1 in each embodiment is mounted is provided in the subsequent stage of the image forming apparatus 100 to perform alignment before post-processing.

  Further, in this specification, as the moving position of the aligning unit that appropriately moves in accordance with the sheet alignment, the position to wait from the end of the print job to the start of the print job is referred to as “initial position”, and the image forming apparatus 100 after the start of the print job. The position at which the aligning means is set to an interval corresponding to the paper width based on the paper size information of the paper P used in the print job currently being executed from the “receiving preparation position”, and the position of the paper P from the side edge detecting means to be described later Based on the edge position information, the receiving position of the sheet P, which is the minimum alignment distance required for alignment from the side edge of the sheet P to the sheet contact surface of the alignment plate 14a by moving from the receiving preparation position, “Accepting position”, respectively.

[First form]
First, a sheet alignment apparatus 1 according to a first embodiment of the present invention will be described with reference to FIGS. The sheet aligning device 1 according to the first embodiment detects a side edge of the printed sheet P discharged from the image forming apparatus 100 along the transport direction X (side edge of the sheet P in the sheet width direction Y), and This is an apparatus for aligning the conveyed paper P according to the alignment reference after moving the alignment means 14 to the paper receiving position in accordance with the side edge position, and is mounted in the post-processing means 200 in the previous stage in the post-processing apparatus 200. A post-processing device 200 is provided at the rear stage of the image forming apparatus 100.

<Device configuration>
As shown in FIG. 2, the first embodiment of the sheet aligning apparatus 1 is schematically configured by a sheet conveying unit 11, a mounting table 12, a side edge detecting unit 13, an aligning unit 14, a storage unit 15, and a control unit 16. Further, the sheet alignment apparatus 1 according to the first embodiment uses the side edge detection unit 13, the alignment unit 14, the storage unit 15, and the control unit 16 as an alignment unit that aligns the sheet P with the alignment reference.

  The sheet conveying unit 11 includes a conveying roller pair 11a including a driving roller and a driven roller, and is pivotally supported along the sheet width direction Y on the upstream side in the conveying direction X (on the image forming apparatus 100 side). In addition, a roller driving gear to which a driving force of a driving motor that is driven based on the control of the control unit 16 is transmitted via an intermediate gear is coupled to the driving roller of the sheet conveying unit 11, and the sheet P is fed from the image forming apparatus 100. When ejected, the transport roller pair 11a rotates based on the drive motor, and transports the paper P to the mounting table 12 along the paper transport path while pinching the paper P.

  The mounting table 12 is formed in a plate shape having a substantially flat mounting surface on the upper surface so that the paper P transported by the paper transporting unit 11 is stacked on the paper P discharged from the image forming apparatus 100. ing. In addition, a guide groove that restricts the sliding direction of the aligning unit 14 in the paper width direction Y perpendicular to the transport direction X is formed on the mounting surface of the mounting table 12.

  The side edge detection unit 13 includes a known photoelectric sensor that can detect the side edge of the conveyed paper P, and is disposed between the paper conveyance unit 11 and the alignment unit 14 on the placement surface of the placement table 12. ing. As an example of the configuration of the side edge detection means 13, a line type sensor (CCD (Charge Coupled Device) arranged in the sheet width direction Y so as to be compatible with the width size of all sheets P usable in the image forming apparatus 100. ) An image sensor, etc.), and the paper is moved in the paper width direction Y by a side edge detection drive mechanism or the like composed of a drive motor as a drive source and a power transmission mechanism that transmits the drive force of the drive motor to the sensor. It is composed of a reflective photosensor that detects the side edge position of P. In this embodiment, a line type sensor is employed as shown in FIG. When the side edge detection unit 13 detects the side edge of the conveyed paper P, the side edge detection unit 13 outputs edge position information indicating the detection position to the control unit 16. In addition, when the side edge detection stop signal is input from the control unit 16, the side edge detection unit 13 stops the side edge detection until the print job being executed ends.

  The aligning means 14 is composed of a pair of aligning plates 14a made of plate-like members that slide in the sheet width direction Y and abut against both side edges of the sheet P and align the sheet P on the alignment reference. On both outer sides in the width direction of the conveyed paper P, the paper P is slidably provided along the guide grooves of the mounting table 12. The aligning means 14 includes a rack integrally formed with each aligning plate 14a, a pinion gear that meshes with the rack, a drive motor that is a drive source, and a power transmission mechanism that transmits the rotational force of the drive motor. An alignment driving mechanism 14b is provided. The aligning unit 14 controls the driving of the aligning drive mechanism 14b based on the control of the control unit 16 so that the sheet is received from the receiving preparation position after detecting the side edge of the sheet P from the initial position to the receiving preparation position after the start of the print job. The sheet P is moved sequentially to the position, and the sheet P conveyed to the sheet receiving position is reciprocated in the relative direction so as to widen or reduce the mutual interval of the alignment plates 14a, thereby regulating the width direction.

  The storage unit 15 is configured by, for example, a magnetic or optical storage medium or a semiconductor memory such as a ROM or a RAM, and stores a drive control program for each unit constituting the sheet aligning apparatus 1. Further, the storage unit 15 stores movement position information for aligning the sheet P conveyed when the print job is executed at the same sheet receiving position in a state in which the sheet P is associated with each sheet cassette of the image forming apparatus 100. ing.

  This movement position information is a movement for moving the alignment means 14 obtained from the edge position information of the paper P conveyed first by the side edge detection means 13 after the start of the print job from the reception preparation position to the paper reception position. This is information that associates the control information with the paper cassette information indicating the paper cassette containing the paper P to be used in the print job currently being executed from the image forming apparatus 100. Therefore, for the second and subsequent sheets P of the same print job, the sheet receiving position of the alignment unit 14 is controlled based on the acquired movement position information.

  The movement position information is reset by a reset factor generated in the image forming apparatus 100 such as a paper size switching operation, a paper cassette switching operation, a paper cassette operation (paper P replenishment, etc.), a print job end, or the like. And updated by the control unit 16 when the next print job is started.

  The control unit 16 is a microcomputer that performs various types of control processing and arithmetic processing, which includes, for example, a CPU, a ROM, a RAM, and the like, and performs drive control of each unit constituting the paper aligning device 1. Further, the control unit 16 performs control to move the aligning unit 14 to the optimum sheet receiving position based on the side edge position detected as necessary. As shown in FIG. 3, the control unit 16 includes a movement distance processing unit 16a, a movement control unit 16b, and a movement position setting unit 16c.

  Based on the edge position information from the side edge detection means 13, the movement distance processing means 16a calculates a distance necessary for the alignment means 14 to move from the reception preparation position to the paper reception position, and movement distance information according to the distance. Is output to the movement control means 16b. This movement distance is calculated every time the paper P is conveyed from the image forming apparatus 100, and movement distance information corresponding to the distance is output to the movement control means 16b.

  When the movement distance processing unit 16a is configured to control the movement of the alignment unit 14 based on the movement position information, the alignment unit 14 receives the sheet from the reception preparation position based on the edge position information of only the first sheet in the same print job. The distance required to move to the position is calculated, and movement distance information corresponding to the distance is output to the movement control means 16b.

  When the paper size information is input from the image forming apparatus 100 when the print job is started, the movement control unit 16b moves the alignment unit 14 from the initial position to the receiving preparation position corresponding to the paper size based on the paper size information. Is output to the matching drive mechanism 14b.

  Further, the movement control means 16b outputs a drive signal for moving the alignment means 14 from the reception preparation position to the paper reception position based on the movement distance information from the movement distance processing means 16a to the alignment drive mechanism 14b. . As a result, the minimum alignment distance (for example, about 5 mm) necessary for alignment from the side edge of the sheet P after conveyance to the sheet contact surface of the alignment plate 14a is obtained, and the alignment distance of the alignment unit 14 is adjusted during sheet conveyance. Control is performed so that the minimum matching distance is obtained.

  Further, when the movement control unit 16b is configured to control the sheet receiving position of the alignment unit 14 with reference to the movement position information stored in the storage unit 15, the second and subsequent sheets in the same print job are stored in the storage unit. The alignment unit 14 is moved from the reception preparation position to the paper reception position based on the movement position information stored in 15. At this time, since the edge position information from the side edge detection unit 13 is not used, a side edge detection stop signal is output to the side edge detection unit 13 until the end of the print job.

  The movement control unit 16b outputs a driving signal for performing the alignment operation of the sequentially conveyed sheets P to the alignment driving mechanism 14b after the alignment unit 14 has moved to the sheet receiving position. Further, when the movement control unit 16b receives a job end signal indicating the end of the print job from the image forming apparatus 100, the movement control unit 16b outputs a drive signal for moving the alignment unit 14 to the initial position to the alignment drive mechanism 14b.

  Note that the movement control unit 16b is conveyed based on the sheet size information from the image forming apparatus 100 in the case where the configuration of the side edge detection unit 13 is a movable sensor that moves in the sheet width direction Y according to the sheet size to be conveyed. A movement control signal for moving the side edge of the paper P to the position where it can be detected is output to the drive mechanism of the side edge detection means 13.

  The movement position setting unit 16 c receives movement control information from the movement control unit 16 b obtained from the edge position information of the sheet P conveyed by the side edge detection unit 13 after the start of the print job, and the image forming apparatus 100. The paper cassette information is set in association with the paper cassette information and stored in the storage unit 15.

  The movement position setting unit 16c resets the movement position information stored in the storage unit 15 when the above-described movement position information reset factor is generated in the image forming apparatus 100, and when the next print job is started. The side edge position of the first sheet P conveyed to the position and the movement control information from the movement control unit 16 b are updated and stored in the storage unit 15 in association with the sheet cassette information from the image forming apparatus 100. When a reset factor occurs, the presence or absence of a reset factor is confirmed by inputting a reset generation signal indicating that fact from the image forming apparatus 100.

<Processing operation>
Next, a series of processing operations in the sheet alignment apparatus 1 according to the first embodiment will be described with reference to FIG. Here, an example of processing operation when the side edge position of the sheet P conveyed in the executed print job is detected for each sheet and the movement of the aligning unit 14 to an appropriate sheet receiving position is controlled according to the side edge position. It is.

  As shown in FIG. 4A, when the print job is started, the alignment unit 14 is first moved from the initial position to the receiving preparation position corresponding to the paper size based on the paper size information from the image forming apparatus 100. Then, the printed paper P is received from the image forming apparatus 100, and the paper transport unit 11 transports the paper P along the transport direction X toward the alignment unit 14.

  When the side edge detection unit 13 detects the side edge of the paper P conveyed from the paper conveyance unit 11, the side edge detection unit 13 outputs edge position information indicating the detection position to the control unit 16. Next, as shown in FIG. 4B, the control unit 16 calculates the movement distance from the reception preparation position to the paper reception position using the input edge position information, and moves according to the calculated movement distance. Based on the movement control information obtained from the distance information, the aligning means 14 is moved from the receiving preparation position to the paper receiving position. Then, as shown in FIG. 4C, the sheet P conveyed to the sheet receiving position is aligned by the aligning means 14, and the prescribed post-processing is performed. When the print job is completed, the aligning unit 14 is moved from the paper receiving position to the initial position, and waits until the next print job is started.

[Second form]
Next, a sheet alignment apparatus 1 according to a second embodiment of the present invention will be described with reference to FIGS.

  The sheet aligning apparatus 1 according to the second embodiment is provided with a roller pair sliding mechanism 21 for sliding in the sheet width direction Y according to the conveying direction X of the sheet P from the image forming apparatus 100 in the sheet conveying unit 11. When the side edge of the sheet P is not detected during conveyance, the sheet conveyance unit 11 is gradually slid until the side edge is detected, and the sheet P is shifted and conveyed to the alignment unit 14 at the sheet receiving position. In this case, the sheet P is aligned in accordance with the alignment reference, and is mounted in the front stage of the post-processing means in the post-processing apparatus 200. The post-processing apparatus 200 is provided in the subsequent stage of the image forming apparatus 100.

<Device configuration>
As shown in FIG. 5, the sheet alignment apparatus 1 according to the second embodiment includes a sheet conveyance unit 11, a mounting table 12, a side edge detection unit 13, an alignment unit 14, a storage unit 15, and a control unit 16. It is roughly structured. Further, the sheet aligning apparatus 1 according to the second embodiment uses a sheet conveying unit 11, a side edge detecting unit 13, an aligning unit 14, a storage unit 15, and a control unit 16 as an aligning unit that aligns the sheet P based on the alignment reference.

  In the second embodiment of the sheet aligning device 1 described below, the same constituent elements as those of the above-described first embodiment of the sheet aligning device 1 are denoted by the same reference numerals, and the description of the configuration contents and processing contents is omitted. Only different configuration requirements, newly added functions and processing contents will be described.

  The paper transport unit 11 includes a roller pair sliding mechanism 21 for sliding and transporting the paper P by sliding in the paper width direction Y so that the side edge of the paper P is detected by the side edge detection unit 13. Yes.

  As shown in FIGS. 6A and 6B, the roller pair sliding mechanism 21 includes a guide shaft 21a fixed to the frame of the apparatus main body along the coaxial direction with the transport roller pair 11a, and a transport roller pair 11a. A power transmission coupled to the slide member 21b and a driving force of a driving motor 21c that is a driving source and a slide member 21b that restricts the sliding direction of the conveying roller pair 11a along the guide shaft 21a to the paper width direction Y. A sliding drive mechanism 21e that slides on the conveying roller pair 11a by transmitting via a member 21d (timing belt, pinion gear, rack, etc.), and the conveying roller pair 11a conveys to the origin position that is a standby position after the end of the print job. Origin position detecting means 21f composed of an optical sensor or a mechanical sensor for detecting whether or not it has been performed.

  As shown in FIG. 6B, the roller pair sliding mechanism 21 controls the side of the conveying roller pair 11a that stands by at the origin position until the start of the print job as shown in FIG. The edge detection means 13 slides to a position where the side edge of the paper P conveyed to the alignment means 14 is detected (hereinafter referred to as “paper conveyance position”). That is, when the paper P is transported from the paper receiving position, the transport roller pair 11a is slid in the edge detection position direction of the side edge detection means in the paper width direction Y (right direction in the example) to the paper transport position. The paper P is shifted and conveyed to the paper receiving position. Further, the roller pair sliding mechanism 21 returns the transport roller pair 11a to the origin position again after transporting the paper, and outputs a detection signal indicating that it has returned to the origin position to the control unit 16.

  The edge detection position of the side edge detection unit 13 is defined, and when the side edge position of the conveyed paper P is detected, the paper contact surface of the alignment plate 14a is detected from the side edge position of the paper P. The interval between the alignment unit 14 and the alignment unit 14 is made constant and the reciprocating operation of the alignment unit 14 can be followed. Note that this embodiment is a configuration example (a portion surrounded by a one-dot chain line shown in FIG. 5) unitized with one alignment plate 14a with the edge detection position as a reference, and is aligned in synchronization with the reciprocating operation of the alignment means 14. Move while keeping the required minimum alignment distance. With this arrangement, when the side edge detection unit 13 detects the side edge position of the conveyed paper P, the paper conveyance destination coincides with the paper receiving position of the alignment unit 14. Further, when the side edge detection unit 13 detects the side edge of the conveyed paper P, it outputs side edge detection information indicating that to the control unit 16.

  Based on the edge detection position of the side edge detection means 13, the alignment means 14 can follow the reciprocating operation during alignment between the one alignment plate 14a and the side edge detection means 13 so that the arrangement position of the alignment plate 14a becomes the sheet receiving position. Are integrally formed. Thereby, when the side edge detection means 13 detects the side edge position of the paper P, the minimum alignment distance (for example, about 5 mm) required for the alignment from the side edge position of the paper P to the paper contact surface of the alignment plate 14a. )

  The storage unit 15 stores movement position information for conveying the sheet P conveyed when the print job is executed at the same movement position in a state in which the sheet P is associated with each sheet cassette of the image forming apparatus 100.

  This movement position information is a movement for moving the conveyance roller pair 11a from the origin position to the sheet conveyance position obtained from the edge position information of the sheet P conveyed first by the side edge detection means 13 after the start of the print job. This is information that associates the control information with the paper cassette information from the image forming apparatus 100. Therefore, for the second and subsequent sheets P of the same print job, the sheet receiving position of the aligning unit 14 is controlled based on the acquired movement position.

  The movement position information is reset by a reset factor generated in the image forming apparatus 100 such as a paper size switching operation, a paper cassette switching operation, a paper cassette operation (paper P replenishment, etc.), a print job end, or the like. And updated by the control unit 16 when the next print job is started.

  As shown in FIG. 7, the control unit 16 is configured to further include a side edge detection determination unit 16d as a new component in addition to the movement distance processing unit 16a, the movement control unit 16b, and the movement position setting unit 16c. ing.

  The side edge detection discriminating means 16d discriminates whether or not the side edge detection information is inputted from the side edge detecting means 13 after the paper conveyance, and the conveyance roller pair 11a is moved to the movement control means 16b until it is inputted. A movement instruction signal for gradually sliding to Y is output to the movement control means 16b. Further, when the side edge detection information is input from the side edge detection means 13, the side edge detection determination means 16d outputs a stop instruction signal for stopping the sliding of the conveying roller pair 11a to the movement control means 16b.

  When the movement distance processing unit 16a inputs the side edge detection information from the side edge detection unit 13 after the conveyance of the paper, after the conveyance of the paper P based on the sliding speed of the conveyance roller pair 11a and the time until the side edge is detected. The movement distance of the conveying roller pair 11a until the side edge is detected by the side edge detection means 13 is calculated, and movement distance information corresponding to this distance is output to the movement position setting means 16c.

  When the movement distance processing unit 16a is configured to move the alignment unit 14 based on the movement position information, the conveyance roller pair 11a conveys the sheet from the origin position based on the edge position information of only the first sheet in the same print job. A distance required to move to the position is calculated, and movement distance information corresponding to the distance is output to the movement position setting means 16c.

  When the paper size information is input from the image forming apparatus 100 when the print job is started, the movement control unit 16b moves the alignment unit 14 from the initial position to the paper receiving position corresponding to the paper size based on the paper size information. Is output to the matching drive mechanism 14b. Further, the movement control unit 16b generates a driving signal for gradually sliding the conveyance roller pair 11a in the paper width direction Y from the origin position based on the movement instruction signal from the side edge detection determination unit 16d. 21 is output. Further, the movement control unit 16b outputs a drive signal for stopping the sliding of the conveying roller pair 11a to the roller pair sliding mechanism 21 based on the stop instruction signal from the side edge detection determination unit 16d. That is, the position where the conveyance roller pair 11a slid from the origin position is stopped becomes the sheet conveyance position in the print job being executed. Further, the movement control means 16b confirms that the conveyance roller pair 11a has returned to the origin position based on the detection signal from the origin position detection means 21e.

  Further, when the movement control unit 16b is configured to control the movement of the sheet conveyance position of the sheet conveyance unit 11 with reference to the movement position information stored in the storage unit 15, the second and subsequent sheets in the same print job. Based on the movement position information stored in the storage unit 15 during conveyance, the conveyance roller pair 11a is moved from the origin position to the paper conveyance position. At this time, since the edge position information from the side edge detection unit 13 is not used, a side edge detection stop signal is output to the side edge detection unit 13 until the end of the print job.

  The movement position setting unit 16c is configured to detect the edge position information of the sheet P conveyed first by the side edge detection unit 13 after the start of the print job, the movement distance information from the movement distance processing unit 16a, and the sheet cassette from the image forming apparatus 100. The information is associated with information and set as movement position information, which is stored in the storage unit 15.

  Further, the movement position setting unit 16c resets the movement position information stored in the storage unit 15 when the reset factor of the movement position information described above occurs in the image forming apparatus 100, and when the next print job is started. The side edge position of the first sheet P conveyed to the position, the movement distance information from the movement distance processing means 16a, and the sheet cassette information from the image forming apparatus 100 are associated and updated and stored in the storage unit 15.

  When a reset factor occurs, the presence or absence of a reset factor is confirmed by inputting a reset generation signal indicating that fact from the image forming apparatus 100.

<Processing operation>
Next, a series of processing operations in the sheet alignment apparatus 1 according to the second embodiment will be described with reference to FIG. Here, the processing operation for detecting the side edge position of the sheet P conveyed in the executed print job for each sheet and controlling the movement of the conveying roller pair 11a to an appropriate sheet conveying position according to the side edge position. It is an example.

  When the print job is started, the alignment unit 14 is first moved from the initial position to the paper receiving position corresponding to the paper size based on the paper size information from the image forming apparatus 100. Next, the printed paper P is received from the image forming apparatus 100, and the paper P is transported toward the alignment unit 14 along the transport direction X by the paper transport unit 11.

  At this time, as shown in FIG. 8A, the conveying roller pair 11a is gradually slid in the sheet width direction Y until the sheet side edge is detected, and the side edge detection unit 13 detects the side edge of the sheet P. The sliding of the conveying roller pair 11a is stopped. Thereby, as shown in FIG. 8B, even if there is a deviation in the carry-in direction, the paper P is accurately conveyed to the paper receiving position of the aligning means 14.

  Then, during the print job, the paper P is transported by gradually sliding the paper transport means 11 from the origin position to the paper width direction Y as necessary based on the transport direction of the paper P that is sequentially transported. When the process is completed, the conveyance roller pair 11a is moved to the origin position as shown in FIG. 8C and waits until the next print job starts.

  As described above, when the paper P is transported, the paper aligning device 11 according to the first embodiment receives the aligning unit 14 from the initial position according to the paper size based on the paper size information from the image forming apparatus 100. Move to the ready position. When the side edge of the sheet P conveyed from the sheet conveying unit 11 is detected, the minimum alignment distance required for alignment from the receiving preparation position to the sheet P using the edge position information indicating the detected position The movement distance to the sheet receiving position is calculated, and the aligning means 14 is moved from the receiving preparation position to the sheet receiving position based on the movement control information obtained from the movement distance information corresponding to the moving distance.

  Thus, the sheet P can be aligned with a minimum alignment distance according to the side edge position of the sheet P detected immediately before alignment, so there is no need to wait at a position that takes into account the mismatch of the transport position. Even if the transport position is shifted, the sheet can be reliably aligned and the alignment time can be increased. In particular, when various types of post-processing apparatuses 200 are connected between the image forming apparatus 100 and the apparatus, the conveyance distance is often increased and the conveyance position of the paper P is often shifted. It is. Further, since the matching distance of the matching means 14 is controlled to the minimum, the effect of reducing noise during matching can be achieved.

  Further, by storing the movement position information in which the movement control information of the aligning unit 14 is associated with the sheet cassette information from the image forming apparatus 100 in the storage unit 15, the second and subsequent sheets P of the same print job are The alignment process can be performed from the sheet receiving position based on the acquired movement position information, and the calculation process of the movement distance of the alignment unit 14 is not required each time the sheet is conveyed, and the alignment process can be further speeded up.

  Further, the sheet aligning device 11 in the second embodiment defines the edge detection position in the side edge detecting means 13, and detects the side edge position of the conveyed sheet P, and then the alignment plate 14a from the side edge position of the sheet P. So that the distance between the sheet contact surface and the sheet contact surface is the minimum alignment distance required for alignment, the installation interval with the alignment unit 14 is constant with respect to the edge detection position, and the reciprocating operation of the alignment unit 14 can be followed. To do. Then, a roller pair sliding mechanism 21 that slides the transport roller pair 11a in the paper width direction Y is provided, and when the paper P from the image forming apparatus 100 is transported toward the aligning unit 14, the side edge detecting unit 13 uses the paper. The conveyance roller pair 11a is slid in the paper width direction Y until the side edge of P is detected, and the sliding of the conveyance roller pair 11a is stopped when the side edge detection unit 13 detects the side edge of the paper P. Then, the paper P is transported toward the aligning means 14 waiting at the paper receiving position.

  Thereby, even if there is a deviation in the carry-in direction, the paper P can be accurately conveyed to the paper receiving position of the aligning means 14. Further, since the paper is shifted and conveyed toward the aligning means 14 that has been moved to the paper receiving position in advance, it is not necessary to wait for the aligning means 14 at a position that takes into account the inconsistency of the transport position, and the paper is not in the transport position. However, the alignment can be performed reliably and the alignment time can be increased. In particular, when various types of post-processing apparatuses 200 are connected between the image forming apparatus 100 and the apparatus, the conveyance distance is often increased and the conveyance position of the paper P is often shifted. It is. Furthermore, since the alignment distance is controlled to the minimum, the effect of reducing noise during alignment is achieved.

  Further, the side edge detection means 13 is arranged so that the edge detection position with respect to the alignment means 14 is always the minimum alignment distance necessary for alignment, and even when the paper P of a different size is conveyed, the sliding of the conveyance roller pair 11a. Since the paper P can be transported to the paper receiving position only by the motion control, the moving distance of the aligning means 14 is shortened, so that the life of the parts can be extended and the maintenance cost can be reduced.

In the second embodiment of the sheet aligning device 1 described above, the configuration is described in which the sheet P discharged from the image forming apparatus 100 is always shifted and conveyed to the sheet receiving position regardless of whether the sheet P is shifted in the loading direction. However, the present invention is not limited to this. For example, the alignment reference of the aligning unit 14 and the transport center of the transport roller pair 11a are matched in advance, and the sheet P is transported to the aligning unit at the original position in the normal state. A configuration may also be adopted in which the paper P is shifted and conveyed by sliding the pair 11a. That is, at the time of normal conveyance, the side edge of the paper P is detected by the side edge detection means 13, so that the paper P is not shifted and conveyed, and when the side edge detection means 13 does not detect the side edge, the conveyance roller In this configuration, the pair 11a is slid in a predetermined direction and shifted and conveyed until a side edge of the paper P is detected.
Thereby, the sliding operation of the conveying roller pair 11a can be suppressed as much as possible, and the effect of preventing the deterioration of the component parts and the like is achieved.

DESCRIPTION OF SYMBOLS 1 ... Paper aligning apparatus 11 ... Paper conveyance means (11a ... Pair of conveyance rollers)
DESCRIPTION OF SYMBOLS 12 ... Mounting stand 13 ... Side edge detection means 14 ... Alignment means (14a ... Alignment plate, 14b ... Alignment drive mechanism)
DESCRIPTION OF SYMBOLS 15 ... Memory | storage part 16 ... Control part (16a ... Movement distance process means, 16b ... Movement control means, 16c ... Movement position setting means, 16d ... Side edge detection discrimination means)
21 ... Roller pair sliding mechanism (21a ... guide shaft, 21b ... slide member, 21c ... driving motor, 21d ... power transmission member, 21e ... sliding driving mechanism, 21f ... origin position detecting means) 100 ... image forming apparatus 200 ... Post-processing device P ... Paper

Claims (1)

A pair of conveyance rollers for nipping and conveying the paper discharged from the image forming apparatus along the conveyance direction X, and a roller pair for sliding the conveyance roller pair along the paper width direction Y orthogonal to the conveyance direction X when conveying the paper A paper conveying means having a sliding mechanism;
An aligning unit comprising a pair of aligning plates, reciprocally moving in the sheet width direction Y and conveyed by the sheet conveying unit at a sheet receiving position, and abutting against the side edge of the sheet to align in the width direction When,
Arranged before the aligning means in the transport direction X, between the side edge of the paper when the paper reaches the aligning means and the paper contact surface of the aligning plate at the paper receiving position Side edge detection means for detecting a side edge of the paper conveyed by the paper conveyance means with reference to an edge detection position set so that the distance in the paper width direction Y is the minimum alignment distance necessary for alignment; ,
When the side edge detection means does not detect the side edge of the sheet at the edge detection position, the pair of conveying rollers is slid in the sheet width direction Y from the original position, and the side edge of the sheet is the edge. A control unit for driving and controlling the roller pair sliding mechanism to be detected at a detection position;
A sheet aligning apparatus comprising:

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