TW201323229A - Control method of media feeding device, media feeding device and printing system - Google Patents

Abstract

This invention provides a control method of media feeding device capable of performing normal detection even during reverse feeding where the movable member in the detection part becomes unstable during the reverse feeding of recording media. The invention is the control method of the media feeding device (2). The media feeding device (2) comprises media feeding part (14) (21), consisting of the forward feeding and reverse feeding of the recording media (4) along the feeding path (13); detection part (33) that has a moveable member (81) facing the feeding path (13) and the ON-OFF (switch) that can be moved by the moveable member (81), and the sensor (82) for detecting whether there is recording media (4) or not, and is capable of performing detection by means of the movement status of the moveable member (81) through the forward feeding of the recording media (4). In the control method, the detection part is set in the detection shield condition when the media feeding part (14) is performing reverse feeding until over the target stop position, and after reverse feeding is performed, the detection shield condition is removed and the forward feeding is performed up to the target stop position.

Description

Media feeding device control method, media feeding device and printing system

The present invention relates to a control method, a media feeding device, and a printing system for a media feeding device that can feed and feed a recording medium along a feeding path.

In the past, as a medium feeding device, a paper feeding mechanism is known which is mounted on a printer device and feeds a printing paper (recording medium) to which a sprocket hole is attached (see Patent Document 1). The paper feed mechanism has a traction mechanism portion, an impression plate facing (opposite) the print head, and a paper discharge roller. It is assumed that the printing paper mounted on the traction mechanism portion is fed to the platen, where the printing head is driven (printed), and then sent out to the outside of the apparatus by the paper discharge roller. A first paper sensor is disposed at a position of the traction mechanism portion, and a second paper sensor is disposed at a position of the print head. When the power of the printer device is turned on, the tail of the printing paper is aligned to a specific position (the position of the recording medium is aligned). For example, when the front end of the printing paper exceeds the printing head and is in the vicinity of the discharge port, the tail paper second paper sensor feeds the printing paper back to the position where the front end of the printing paper is detected (the recording medium is self-discharged) The outlet is transported to the supply port, and then the positive feed is carried out (the recording medium is transported from the supply port to the discharge port). Further, after the positively fed printing paper is subjected to the front end detection by the first paper sensor, the printing head is driven to start printing.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 8-244296

Further, in a paper sensor or the like provided in the traction mechanism portion, a sensor having a mechanical movable member (including a micro switch) is also used: since the printing paper (recording medium) is provided in the traction mechanism portion The floating guide sheet is actuated by pressing the printing paper with the paper of the guide sheet. The movable member is folded (synchronized) to the printing paper being fed, and is rotated from the upright position to the lying position to turn the sensor body ON.

If a sensor having such a movable member is used in the second paper sensor of the above-described conventional paper feeding mechanism, the front end of the printing paper can be detected mechanically and accurately in the normal positive feeding. However, if the printing paper corresponding to the tailing is fed back, there is a flaw in that the movable member is rotated from the lying position to the upright position by the friction at the time of folding, thereby causing false detection in the front end detection of the printing paper. .

An object of the present invention is to provide a method of controlling a media feeding device, a media feeding device, and a printing system, wherein the media feeding device is in a detecting portion in which the movable member is moved only by the positive feed of the recording medium, even if feedback is sent. Achieve normal detection.

The control method of the media feeding device of the present invention comprises a media feeding portion and a control method of the media feeding device of the detecting mechanism, wherein the media feeding portion can feed and feed the recording medium along the feeding path, the detecting mechanism including the feedable a movable member that moves the path forward and backward, and detects a movable member a position detecting unit configured to move the movable member between a position in which the movable member enters and exits the feeding path and a retracted position by a recording medium of the feeding path; and the control method of the medium feeding device is characterized in that When the recording medium is fed a certain amount by the medium feeding unit, the detecting unit does not detect the detection mask state of the recording medium, and performs feedback feeding until the end portion of the recording medium exceeds the position of the detecting unit, and The above-described recording medium is fed until the target stop position after the above-described detection mask state is released.

In this case, when the feedback feed is performed, the detection unit body is set to the detection shield state, so that erroneous detection due to the movement of the movable member can be prevented.

Preferably, in this case, when the target stop position is fed backward after being fed back to the recording medium, the detecting unit detects the position of the front end of the recording medium. You can wait for a specific location and prepare for the next transfer.

According to the control method, when the feedback feed is performed by the media feed unit, the feedback is sent after the target stop position (the end of the recording medium before the recording unit is at the position of the detection unit) is performed, and the positive feed is performed until the feed is performed. Since the target is stopped until the movable member is moved by the positive feed of the recording medium and is unstablely moved at the time of feedback feeding, the movable member can be surely moved to the target stop position. In other words, in the detecting unit that detects the movement of the movable member by the positive feed of the recording medium, the movement of the movable member is not detected even if the feedback is performed, so that normal detection can be realized. Further, the target stop position is set to the position detected by the detection unit by the front end, whereby the end of the recording medium can be accurately performed. Moreover, when the feedback is sent, by the stepping number of the stepping motor or the number of pulses of the rotary encoder, The predetermined amount can be counted and transferred.

According to this configuration, the movement of the movable member during the feedback feeding is caused by erroneous detection (noise) to the detecting unit. However, when the feedback is sent, the detecting unit body is set to the detection shielding state, so that the movable member can be avoided. The impact of mobility. Therefore, the recording medium can be surely detected.

Furthermore, the detecting portion is preferably a photo sensor or a micro switch.

Preferably, in such a case, the medium feeding portion has a traction mechanism that feeds a recording medium to which the sprocket holes are attached, and the detecting portion is incorporated in the traction mechanism.

According to this control method, it is applicable to a traction mechanism that can accurately convey the recording medium, and when the recording medium is mounted, the presence or absence of the recording medium can be reliably detected. Moreover, the detection of the recording medium at the time of positive feed and feedback feeding of the recording medium can be performed with high precision.

Preferably, in this case, when the feedback is performed, the detecting unit is configured not to detect the detection mask state of the recording medium.

According to this control method, the movement of the movable member during the feedback feeding is noise to the detecting unit, but the detecting unit is set to detect the shielding state during the feedback feeding, so that the noise can be removed. Therefore, the recording medium can be surely detected.

Further, it is preferable that the movable member is rotated about the support shaft, one of which is constituted by a member body that is guided in and out of the feeding path, and the other of which is constituted by a light shielding piece that shields the detection light of the detecting portion; The detecting portion is a photodetector; and further comprising: an inclined body that is inclined from a standing position in which the member body enters and exits the feeding path to a retracted position in which the member body retreats from the feeding path; and a spring that is inclined to the upright position Empowerment.

Preferably, the component body of the movable member of the media feeding device is The slope of the side in contact with the recording medium at the time of positive feeding is a gentle angle as compared with the slope of the side in contact with the recording medium at the time of feedback feeding.

According to this control method, the recording medium can be detected with a simple configuration and surely.

The media feeding device of the present invention is characterized by comprising: a media feeding portion that can feed and feed the recording medium along the feeding path; and a detecting mechanism that includes a movable member that can enter or exit from the feeding path And a detecting unit that detects the position of the movable member, and configured to move the movable member between the position where the movable member enters and exits the feeding path and the retracted position by the recording medium of the feeding path; and the control unit controls The media feeding unit feeds the recording medium to a certain amount by the media feeding unit, and then the detection unit does not detect the detection mask state of the recording medium, and performs feedback feeding until the end of the recording medium exceeds the detection. The position of the portion is up, and the recording medium is fed until the target stop position after the detection of the detection mask state is released.

According to this configuration, when the feedback is performed by the media feed unit, the feedback is sent after the target stop position (the end of the recording medium before the recording unit is at the position of the detection unit), and the positive feed is performed until the target stop position. Therefore, even if the movable member is moved by the positive feed of the recording medium and is unstablely moved when the feedback is sent, the movable member can be surely moved to the target stop position. In other words, in the detecting unit that detects that the movable member is moved only by the positive feed of the recording medium, the movement of the movable member is not detected even if the feedback is performed, so that normal detection can be realized.

According to this configuration, the movement of the movable member during the feedback feeding is caused by erroneous detection (noise) to the detecting unit. However, when the detecting unit is in the detection shielding state during feedback feeding, the movement of the movable member can be removed. The impact. Therefore, the recording medium can be surely detected.

Preferably, in the medium feeding device, the target stop position is a position at which the detection unit detects the front end of the recording medium when the recording medium is fed back by the recording medium.

Preferably, in the above media feeding device, the medium feeding portion includes a pulling mechanism that feeds the recording medium to which the sprocket hole is attached, and the detecting portion is incorporated in the pulling mechanism.

Preferably, in the detecting means of the medium feeding device, the movable member is rotated about a support shaft, one of which is constituted by a member body that enters and exits the feeding path, and the other of which is configured to shield the detecting portion. The light-shielding portion of the detecting light; the detecting portion is a photodetector; and includes: an inclined body that is inclined from a standing position in which the member body enters and exits the feeding path toward a horizontal position in which the member body retreats from the feeding path And a spring that energizes the inclined body to an upright position.

Preferably, in the member body of the movable member of the medium feeding device, the inclined surface on the side in contact with the recording medium at the time of positive feeding is gentler than the inclined surface on the side in contact with the recording medium during feedback feeding. The angle.

The printing system of the present invention is characterized by comprising: the medium feeding device; and a printing unit that prints the recording medium on the upstream side in the conveying direction of the recording medium of the medium feeding portion.

According to this configuration, the recording medium can be reliably detected, so that the printing quality or the reliability of the apparatus can be improved.

Hereinafter, a printing system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an explanatory view of a printing system mainly composed of a printing device, as shown in the figure, the printing system 1 includes: a printing device 2 including an inkjet printer; and a host computer 3 connected to the printing via an interface Device 2. In the printing apparatus 2, a recording medium (hereinafter referred to as "recording medium") 4 with a sprocket hole is used as a printing target, and printing is performed based on a printing task received by the self-computer 3, and is implemented based on a control command. Media feed action (paper feed action). Further, the printing apparatus 2 of the embodiment is configured such that not only continuous paper with perforations but also recording paper 4, and single ticket paper (both with sprocket holes) can be used as the recording medium 4.

As shown in FIG. 1, the printing apparatus 2 includes a feeding path 13 extending substantially horizontally from the paper feeding port 11 to the paper discharge opening 12, and includes a medium feeding portion 14 and printing from the paper feeding opening 11 side in this order along the feeding path 13. Part 15 and paper discharge unit 16. Further, the printing apparatus 2 includes a controller 17, which controls the medium feeding unit 14, the printing unit 15, the paper discharge unit 16, and the like, and is linked (communicated) with the host computer 3, and the controller 17 is divided by the CPU. The central processing unit 18 has a memory unit 19 such as a ROM (Read Only Memory) and a RAM (Random Access Memory).

The media feed portion 14 has a traction mechanism 21 that is engaged to (insert the protrusion The recording medium 4 is fed into the sprocket hole; the roll mechanism 22 is fed to the recording medium 4 in cooperation with the traction mechanism 21; the single feed motor 23 drives the traction mechanism 21 and the roll mechanism 22 together; and the conveyor belt The transmission mechanism 24 transmits the power of the feed motor 23 to the traction mechanism 21 and the roll mechanism 22. Further, the roll mechanism 22 has a roll 26 including a drive roller 27 and a driven roller 28, and has an encoder 29 that detects the feed amount (feeding step number) of the recording medium 4 by the roll 26.

The traction mechanism 21 is disposed near the downstream side of the paper feed port 11, the roll mechanism 22 is disposed near the upstream side of the printing unit 15, and the traction mechanism 21 and the roll mechanism 22 are disposed apart from each other in the feeding direction of the recording medium 4. Therefore, the recording medium 4 is fed in such a manner that it is delivered from the traction mechanism 21 to the roll mechanism 22. In this case, the media feed speed of the roll mechanism 22 is designed in a slightly slower manner than the media feed speed of the traction mechanism 21, and the recording medium 4 is fed in the stretched state (stretched state). Further, between the traction mechanism 21 and the roll mechanism 22, a media guide 31 for guiding the feed of the recording medium 4 along the feeding path 13 is disposed, and a media end detecting sensor 32 is disposed at the media guide. On the downstream side of the deflector 31, the front end or the trailing end (end) of the recording medium 4 is detected by detecting the presence or absence of the recording medium 4. Further, in the traction mechanism 21, a medium detecting sensor 33 that detects the presence or absence of the recording medium 4 (the state in which the recording medium 4 is mounted) is incorporated.

The printing unit 15 includes an inkjet head 42 that is mounted downward on the carriage 41. Further, the printing unit 15 includes a carriage moving mechanism 43 that reciprocates the inkjet head 42 in a direction orthogonal to the feeding direction of the recording medium 4 (width direction of the recording medium 4) via the carriage 41; and the medium Support plate (imprint plate) 44, which is located Directly below the inkjet head 42, a specific gap (space) is spaced apart from the nozzle face 42a of the inkjet head 42 to face (opposite). An ink cartridge (not shown) is mounted on the upper side of the ink jet head 42 on the tray 41, and ink is supplied from the ink cartridge to the ink jet head 42. The nozzle face 42a of the inkjet head 42 is provided with a nozzle row 45 in which a plurality of discharge nozzles 45a are arranged in the medium feed direction (actually, a plurality of nozzle rows having different colors). On the carriage 41, a width detecting sensor 46 that mainly detects the width of the recording medium 4 is provided at a position shifted from the nozzle row 45 toward the upstream side.

The carriage moving mechanism 43 has: two guiding rods 51, 51 extending in the width direction of the recording medium 4, slidably supporting the bracket 41; a timing belt 52, a part of which is fixed to the bracket 41; And a carriage motor 53 that moves the timing belt 52 in both forward and reverse directions. When the carriage motor 53 rotates forward and backward, the carriage 41 guided by the two guide bars 51, 51 via the timing belt 52 reciprocates in the width direction of the recording medium 4. The inkjet head 42 is ejected and driven in synchronization with the backward movement of the reciprocating movement and/or the movement is performed, whereby printing is performed on the recording medium 4 (so-called main scanning).

The paper discharge unit 16 includes a paper discharge roller 61 that holds (squeezes and supports) the recording medium 4 for rotational feeding, and includes a paper discharge driving roller 62 on the driving side and a star wheel 63 on the driven side; A motor 64 that rotates the paper discharge drive roller 62. The paper discharge driving roller 62 located on the lower side is transferred (contacted) to the back surface of the recording medium 4 to impart a feeding force to the recording medium 4, and on the other hand, the star wheel 63 located on the upper side is biased to the side of the paper discharge driving roller 62. In the state of the energy, the recording surface (front surface) of the recording medium 4 is transferred (contacted) while being freely rotated. In this case, it is designed to be slightly slower than the media feed speed of the paper discharge drive roller 62. The media feed speed of the roll mechanism 22, the recording medium 4 is in a state in which tension (stretched state) is imparted by the slip rotation of the paper discharge drive roller 62 (sliding while being transported with respect to the recording medium 4). The media support plate 44 feeds and then feeds (discharges) from the paper discharge port 12 to the outside of the apparatus.

Here, the basic control operation of the printing apparatus 2 by the controller 17 based on the print job and the control command of the host computer 3 will be described.

First, after the user mounts the recording medium 4 on the traction mechanism 21, the user system is initialized. This initialization is started by closing the lid (not shown) of the printing device 2 covering the medium feeding portion 14 or the like, or by the operation of the button provided on the operation portion of the printing device 2. At this time, the "detection" of the recording medium 4 is detected by the medium detecting sensor 33. When the initialization is started, the traction mechanism 21 and the roll mechanism 22 are driven by the feed motor 23. Thereby, the recording medium 4 mounted on the traction mechanism 21 is fed along the feeding path 13 to the media guide 31, the roll mechanism 22, and further fed to the printing portion 15. More specifically, the recording medium 4 sent from the traction mechanism 21 detects the front end thereof by the media end detecting sensor 32, and feeds the specific feed from the front end detection by the feed motor 23 as the stepping motor. Stop after the number of steps. Thereby, the recording medium 4 is stopped at the initial position 48 which is the position of the so-called first nozzle (the first discharge nozzle 45a) which is located at the outermost end of the nozzle row 45 of the ink jet head 42 on the downstream side.

Then, the carriage 41 reciprocates once across the recording medium 4, and the width detecting sensor 46 provided on the carriage 41 detects the width of the recording medium 4. The detection result is used to compare with the setting result of the recording medium 4 in the host computer 3 (when it is inconsistent, the setting change or the recording medium 4 is caused to be more change). On the other hand, when the carriage 41 is returned to the original position, the position is detected by the sensor outside the figure. Thereby, the starting position of the reference when the ink jet head (the carriage 41) 42 is moved is determined. In this way, the initialization of the mechanism system takes place.

Then, when the autonomous computer 3 issues a print command (send a print job), when the blank is set in advance, the feed of the recording medium 4 corresponding to the blank is performed, and then the print operation is performed. In the printing operation, the ink jet head (the tray 41) 42 moves in the direction of the recording medium 4 in the stopped state of the paper feed, and performs ink ejection based on the print material generated from the print job (printing: main scanning). . The printing width becomes the length of the nozzle row 45 of the inkjet head 42, and the paper discharge roller 61 is driven in addition to the traction mechanism 21 and the roller mechanism 22, in accordance with the length of the nozzle row 45, before the inkjet head 42 is moved toward the next direction. (Strictly speaking, the nozzle row length +1 nozzle pitch) feeds the recording medium 4 (line feed: sub-scan). When the line feed (intermittent feeding) of the recording medium 4 of the nozzle row 45 is completed, the ink jet head 42 is moved toward the movement and performs printing (ink ejection) in the same manner as in the case of the backward movement.

In this manner, the ink ejection (main scanning) accompanying the reciprocating movement of the inkjet head 42 and the intermittent feeding (line feed: sub-scanning) with the recording medium 4 are repeated, whereby the recording medium 4 is expected to be based on the printed material. print. On the other hand, the printed portion of the recording medium 4 is fed by the paper discharge roller 61 while being fed out from the paper discharge port 12 to the outside of the apparatus.

Here, in the case where the recording medium 4 is a single ticket paper, the trailing end (rear end) of the recording medium 4 exceeds the paper discharge roller 61 (for example, the feeding of the specific feed is detected from the trailing end of the medium end detecting sensor 32). After the number of steps, the paper discharge roller 61 and the like are stopped. Drive to end a series of printing moves.

On the other hand, when the recording medium 4 is a continuous paper, at the end of the final main scanning (the actual printing is finished), the perforation of the recording medium 4 is conveyed to the position of the paper discharge port 12, and the printed portion is directed to the paper discharge port. After the delivery is made outside the 12, the driving of the paper discharge roller 61 or the like is stopped. Here, the user cuts off the printed portion of the recording medium 4 by using the punch, and thereafter issues a feedback instruction of the recording medium 4 by a button operation or the like. When the feedback command is issued, the traction mechanism 21, the roll mechanism 22, and the paper discharge roller 61 are reversed, and the recording medium 4 cut away by the punching is reversed until the front end thereof is located at the traction mechanism 21, that is, by the media detecting sensor. 33 and the front end is detected (tailed). Moreover, in the case of continuous paper, a series of printing actions are ended here. Thereafter, after the user issues an instruction to perform the same operation as described above or replaces (paper-replaces) the recording medium 4, an instruction to perform the same operation as described above is issued.

Next, the structure of the traction mechanism 21 (media feed unit) and the medium detection sensor 33 (detection unit) provided in the traction mechanism 21 will be described in detail with reference to FIGS. 1 and 2 . Further, a method of controlling the above-described reverse operation (feedback operation) of the recording medium 4 using these mechanisms or the like will be described with reference to FIGS. 1 and 3.

As shown in FIGS. 1 and 2, the traction mechanism 21 includes a pair of left and right mechanism portions (only one of which is shown) 71, and a drive shaft 72 and a driven shaft 73 which are interposed between the pair of mechanism portions 71. Each mechanism portion 71 has a drive pulley 75 that is fitted to a drive shaft 72 having a rectangular cross section, a driven pulley 76 that is disposed on the driven shaft 73, and a sprocket conveyor 77 that is mounted on the drive pulley 75 and the driven pulley 76. between. On the outer peripheral surface of the sprocket belt 77, a chain with the recording medium 4 is disposed. The plurality of projections 77a corresponding to the same arrangement pitch (the same arrangement pitch), the sprocket conveyor 77 is disposed in such a manner that the outer peripheral surface on the upper side thereof coincides with the feed path 13 described above. Further, in each of the mechanism portions 71, a pressing plate 78 that guides the feeding of the recording medium 4 mounted on the sprocket belt 77 and presses up the floating of the recording medium 4 is provided. The pressure plate 78 is configured to be reciprocally centered on the left and right outer ends, and has an opening (not shown) that avoids the plurality of projections 77a of the moving sprocket belt 77.

The projection 77a of the sprocket belt 77 is fitted into the sprocket hole at the front end portion of the recording medium 4, and the pressing plate 78 is pulled in this state, whereby the recording medium 4 is mounted. When the recording medium 4 is mounted, the medium detecting sensor 33 is turned ON (detecting "Yes" of the recording medium 4), and driving of the traction mechanism (feed motor 23) 21 can be realized. Further, if the feed motor 23 is driven, the sprocket belt 77 is moved to feed the recording medium 4 by its plurality of projections 77a. Further, the positive feedback transmission of the recording medium 4 is mainly controlled based on the detection results of the media side detecting sensor 32, the medium detecting sensor 33, and the encoder 29 provided in the roll mechanism 22.

As shown in FIG. 2, the medium detecting sensor 33 includes a movable member 81 disposed between the pair of mechanism portions 71 and mechanically actuated by the recording medium 4, and a sensor body 82 (detecting portion) ), which includes a photo interrupter (transmissive photosensor). The movable member 81 has an inclined body 83 integrally formed by the member body 84 and the visor portion 85 having a position toward the feeding path 13 (the recording medium 4 of Fig. 2(b)) Similarly, the protruding portion 84a protrudes downward from the member body 84, and passes the detection light of the sensor body 82 or blocks it ON-OFF (ON/OFF) turn off). Further, the movable member 81 has a (stretched) spring 86 that energizes the inclined body 83 in one direction. The inclined body 83 is attached to the standing position (the position of FIG. 2(a)) in which the protruding portion 84a of the inclined body 83 protrudes toward the feeding path 13, and the lying position (the position of FIG. 2(b)) which is retracted from the feeding path 13. The driven shaft 73 of the above-described traction mechanism 21 is rotatably supported. The protruding portion 84a of the inclined body 83 that protrudes toward the feeding path 13 is formed in a mountain shape (triangle), and the inclined body 83 is at a position shifted from the top of the protruding portion 84a toward the paper feed port 11 side, and is rotatably rotated by the driven shaft 73. stand by. Further, the spring 86 energizes the inclined body 83 toward the upright position. In the inclined surface on both sides of the conveying direction of the protruding portion 84a, the slope of the positive direction of the paper feed (the left side of FIG. 2) is inclined to the length of the inclined feeding surface (the right side of FIG. 2). angle. When the paper feed is performed in the positive direction, the recording medium 4 is more smoothly touched, and thereafter it can smoothly slide along the slope.

If the recording medium 4 does not exist on the traction mechanism 21, the inclined body (movable member 81) 83 is rotated to the upright position by the spring 86, and the shutter portion 85 on the opposite side of the driven shaft 73 is rotated from the sensor body 82. The position to the downstream side (see Fig. 2(a)). Thereby, the sensor body 82 can determine the "none" of the recording medium 4 by passing through the light shielding sheet portion 85 and detecting the detection light. On the other hand, if the recording medium 4 is present on the traction mechanism 21, the inclined body (movable member 81) 83 is rotated (tilted) against the spring 86 toward the lying position, and the light shielding piece portion 85 faces the sensor body 82. The mode is rotated (tilted) (refer to Fig. 2(b)). Thereby, the sensor body 82 can be detected by shielding the detection light by the light shielding piece portion 85, whereby the "present" of the recording medium 4 can be determined.

If the recording medium 4 is mounted on the traction mechanism 21, it is recorded on the inclined body 83. When the recording medium 4 is pressed, the inclined body 83 is biased in the direction in which the driven shaft 73 is displaced toward the downstream side in the conveying direction, and the inclined body 83 is inclined toward the lying position (see Fig. 2(a) to Fig. 2(b). ) turn clockwise). Further, in the state (positive feeding) in which the recording medium 4 to be mounted is fed by the pulling mechanism 21, the inclined body 83 is also biased in the direction in which the driven shaft 73 is displaced toward the downstream side, whereby the inclined body 83 is applied. tilt.

On the other hand, when the recording medium 4 is fed back by the traction mechanism 21, the inclined body 83 is biased in the direction of the driven shaft 73. Therefore, if the frictional force between the recording medium 4 and the inclined body (projecting portion 84a) 83 or the engaging force with the inclined surface of the protruding portion 84a is small, the inclined body 83 and the recording medium 4 slide smoothly, and thus can be maintained. Horizontal position (recumbent position). However, if the frictional force or the engaging force is large, it is rotated to the upright posture (upright position) with the feedback of the recording medium 4, and then further rotated in the reverse direction (counterclockwise) until the protruding portion 84a is fed from the feeding path 13 Until the position of retreat. In this case, since the light shielding piece portion 85 is rotated to a position shifted from the sensor body 82, the detection light is passed through and detected, and even if the recording medium 4 is present, it is judged as "none". In other words, when the recording medium 4 is fed back by the pulling mechanism 21, the operation of the medium detecting sensor 33 becomes unstable, and the erroneous detection is caused. Therefore, in the present embodiment, when the recording medium 4 is reversed (feedback operation), the following control is performed.

The control is shown in the flow chart of Fig. 3. After the main computer 3 receives the print job and performs specific printing by the inkjet head 42, in the case of continuous paper, it is further conveyed to the paper discharge port 12 and then started. If the controller 17 sends a feedback command (S-1) of the recording medium 4, the media detection is first performed. The sensor 33 detects the presence or absence of the recording medium 4 (S-2 and S-3). In other words, it is confirmed whether or not the recording medium 4 is continuous paper (accurately, whether feedback can be realized). Here, when "NO" of the recording medium 4 is detected, it is determined that the mounted recording medium 4 is a single ticket paper (cannot be fed back), and the operation flow is ended. On the other hand, when "Yes" of the recording medium 4 is detected, the traction mechanism 21, the roll mechanism 22, and the paper discharge roller 61 are reversely driven to start feedback feeding of the recording medium 4 (S-4).

In the feedback transmission, the front end of the recording medium 4 is returned to a specific position based on the position of the medium detecting sensor 33. At the time of feedback transmission, the position at which the front end of the recording medium 4 is detected by the medium detecting sensor 33 is set as the target stop position, and the recording medium 4 is further fed from the position to the front side of the recording medium 4 to the upstream side. The position of the step is up. For example, the end portion before the feedback is sent to the recording medium 4 is not detached from the traction mechanism 21 and completely exceeds the pre-stop position 49 of the medium detecting sensor 33. Specifically, for example, the number of feed steps corresponding to the distance between the pre-stop position 49 and the media end detecting sensor 32 is obtained in advance, and the front end of the recording medium 4 that has started to be fed back is detected from the media end detecting sensor. 32 detects the state of the front end, and feeds back according to the number of feed steps to stop the feedback of the recording medium 4. Thereby, the recording medium 4 is stopped by the front end thereof being the pre-stop position 49 (S-5). Furthermore, as described above, the detection by the media detecting sensor 33 during feedback feeding is unstable. Therefore, in the feedback feeding, it is preferable that the controller 17 sets the media detecting sensor 33 to detect shielding without detecting. Status (state in which no detection is performed).

If the recording medium 4 stops at the pre-stop position 49, the current traction mechanism 21 and the roll mechanism 22 are driven in the forward direction to start the positive feed (forward feed) of the recording medium 4 (S-6). When the positive feed of the recording medium 4 is started, the above-described detection mask state is released, and the presence or absence of the recording medium 4 is detected by the medium detecting sensor 33 (S-7 and S-8). Here, when "NO" of the recording medium 4 is detected, the recording medium 4 is not transported. Therefore, it is determined that the paper feed of the recording medium 4 is incorrect (S-9), and the operation flow is ended. On the other hand, if the front end of the recording medium 4 tilts the movable member 81 of the medium detecting sensor 33 and detects "Yes" of the recording medium 4, the positive feed of the recording medium 4 is stopped (S-10), thereby ending the action. Process. Thereby, the reverse motion (tailing) of the recording medium 4 ends.

As described above, in the present embodiment, in the reverse operation of the recording medium 4, the media detection sensor 33 is in a detection mask state in which detection is not performed, and the target stop position is exceeded (using the medium detection sensor 33) After the feedback is sent, the front end detection position is released, and the detection of the mask state is released, and the positive feed is performed until the target stop position, whereby the front end detection of the recording medium 4 by the medium detecting sensor 33 is performed. Therefore, even if the movable member 81 is unstablely actuated by the feedback of the recording medium 4, the movable member 81 can be surely actuated to the target stop position. Therefore, the tailing operation of the recording medium 4, which is a reverse operation of the recording medium 4 to the traction mechanism 21, can be surely performed.

Furthermore, when the media side detecting sensor 32 is in the same configuration as the medium detecting sensor 33 having the movable member 81, the front end detecting position of the recording medium 4 using the media end detecting sensor 32 can also be detected. The target stop position is set, and the above-described reverse operation is performed. That is, the present invention can also be applied to a case where the medium feeding portion is separated from the detecting portion or a case where the position of the detecting portion is different from the target stopping position. Moreover, even if the media feed portion is a roller mechanism, it can be applied this invention. Further, the printing system 1 of the embodiment may be constituted by an integrated device.

1‧‧‧Printing system

2‧‧‧Printing device

3‧‧‧Main computer

4‧‧‧Recording media

11‧‧‧ Feeding port

12‧‧‧ paper exit

13‧‧‧ Feeding path

14‧‧‧Media Feeding Department

15‧‧‧Printing Department

16‧‧‧Drawing Department

17‧‧‧ Controller

18‧‧‧CPU

19‧‧‧ Memory Department

21‧‧‧ traction mechanism

22‧‧‧ Rolling mechanism

23‧‧‧Feed motor

24‧‧‧Conveyor belt drive

26‧‧‧ Rolls

27‧‧‧ drive roller

28‧‧‧ driven roller

29‧‧‧Encoder

31‧‧‧Media Introducer

32‧‧‧Media-side detection sensor

33‧‧‧Media Detection Sensor

41‧‧‧ bracket

42‧‧‧Inkjet head

42a‧‧‧nozzle face

43‧‧‧ bracket moving mechanism

44‧‧‧Media support board (imprinted tablet)

45‧‧‧Nozzle row

45a‧‧‧Spray nozzle

46‧‧‧Width detection sensor

48‧‧‧Initial position

49‧‧‧Pre-stop position

51‧‧‧ Guide rod

52‧‧‧ Timing belt

53‧‧‧Bracket motor

61‧‧‧paper discharge roller

62‧‧‧Drawing drive roller

63‧‧‧Star Wheel

64‧‧‧paper discharge motor

71‧‧‧Institutional Department

72‧‧‧ drive shaft

73‧‧‧ driven shaft

75‧‧‧ drive pulley

77‧‧‧Sprocket conveyor

77a‧‧‧ Protrusion

78‧‧‧ pressure plate

81‧‧‧ movable parts

82‧‧‧Sensor body

83‧‧‧ slant body

84‧‧‧Component Ontology

84a‧‧‧Protruding

85‧‧‧ Shading Department

86‧‧‧ Spring

Fig. 1 is an explanatory view of a printing system according to an embodiment of the present invention.

2(a) and 2(b) are cross-sectional views of the periphery of the medium detecting sensor of the embodiment.

Figure 3 is a flow chart of the feedback action of the recording medium.

Claims (11)

A method for controlling a media feeding device, comprising: a media feeding portion and a method of controlling a media feeding device of a detecting mechanism, wherein the media feeding portion can positively feed and feed back a recording medium along a feeding path, wherein the detecting mechanism includes a movable member that moves the feeding path forward and backward, and a detecting portion that detects a position of the movable member, and the movable member is moved between the position to and from the feeding path and the retracted position by the recording medium of the feeding path The method of controlling the medium feeding device is characterized in that the recording unit is fed a certain amount by the medium feeding unit, and the detecting unit is configured not to detect the detection mask state of the recording medium. The feedback is sent until the end of the recording medium exceeds the position of the detecting unit, and the recording medium is fed until the target stop position after the detection of the detection mask state is released. The control method of the media feeding device of claim 1, wherein the target stop position is a position at which the front end of the recording medium is detected by the detecting unit when the feed is fed back to the recording medium. The control method of the medium feeding device of claim 1, wherein the medium feeding portion includes a pulling mechanism that feeds the recording medium to which the sprocket hole is attached, and the detecting portion is incorporated in the traction mechanism. The control method of the media feeding device of claim 1, wherein in the detecting mechanism, The movable member is rotated about a support shaft, one of which is constituted by a member body that enters and exits the feeding path, and the other of which is constituted by a light shielding piece that shields detection light of the detecting portion; the detecting portion is a photodetector And further comprising: an inclined body that is inclined from a standing position in which the member body enters and exits the feeding path to a recumbent position in which the member body retreats from the feeding path; and a spring that energizes the inclined body toward an upright position . The control method of the medium feeding device of claim 1, wherein in the member body of the movable member, a slope of a side in contact with the recording medium at the time of positive feeding and a slope of a side contacting the recording medium at the time of feedback feeding are Than, in a gentle angle. A media feeding device, comprising: a media feeding portion that feeds and feeds a recording medium along a feeding path; a detecting mechanism that includes a movable member that can move forward and backward toward the feeding path, and detects the movable a detecting unit at a position of the member, wherein the movable member moves between a position where the movable member enters and exits the feeding path and a retracted position by the recording medium of the feeding path; and a control unit that controls the medium The feeding unit feeds the recording medium by a specific amount by the medium feeding unit, and the detecting unit does not detect the detection mask state of the recording medium, and performs the feedback transmission until the end portion of the recording medium exceeds the above-mentioned Location of the inspection department The recording medium is fed to the target stop position immediately after the detection of the detection mask state is released. The media feeding device of claim 6, wherein the target stop position is a positive feed of the recording medium, and the detecting unit detects a position of the front end of the recording medium. The medium feeding device of claim 6, wherein the medium feeding portion includes a pulling mechanism that feeds the recording medium to which the sprocket hole is attached, and the detecting portion is incorporated in the traction mechanism. The medium feeding device according to claim 6, wherein in the detecting means, the movable member is rotated about a fulcrum, one of which is constituted by a member body that enters and exits the feeding path, and the other of which is shielded by the detecting portion The light-detecting sheet portion of the detecting light; the detecting portion is a photodetector; and includes: an inclined body that is retracted from the vertical position of the member body toward and from the feeding path toward the retracting position of the member body from the feeding path And a spring that energizes the inclined body to an upright position. The medium feeding device of claim 6, wherein in the member body of the movable member, a slope of a side in contact with the recording medium at the time of positive feeding is compared with a slope of a side of the feedback medium which is in contact with the recording medium The angle of relaxation. A printing system comprising: the media feeding device of claim 6; The printing unit prints the recording medium on the upstream side of the transport direction of the recording medium in the medium feeding unit.