JP2013039709A - Method for controlling medium feeding device, medium feeding device, and printing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method or the like for controlling a medium feeding device that can normally detect a movable member even in reverse feeding when the movable member is located in a detection part where it is moved only in forward feeding.SOLUTION: The method controls the medium feeding device 2 including a medium feeding part 14 (21) configured to forwardly and reversely feed the recording medium 4 along a feeding path 13, and the detection part 33 that has the movable member 81 facing the feeding path 13 and a detection part body 82 that detects whether the recording medium 4 exists by being turned on/off by the movement of the movable member 81, and in which the movable member 81 moves by only the forward feeding of the recording medium 4. When the medium feeding part 14 executes the reverse feeding, the reverse feeding is executed over a target stop position, and subsequently, the forward feeding is executed to the target stop position.

Description

  The present invention relates to a method for controlling a medium feeding device capable of forward and backward feeding of a recording medium along a feeding path, a medium feeding device, and a printing system.

  Conventionally, as this type of medium feeding device, a paper feeding mechanism that is mounted on a printer device and feeds printing paper (recording medium) with sprocket holes is known (see Patent Document 1). This paper feed mechanism has a tractor mechanism, a platen facing the print head, and a paper discharge roller, and feeds the print paper set on the tractor mechanism to the platen, where the print head is driven (printing). However, it is further fed out of the apparatus by a paper discharge roller. A first paper sensor is provided at the position of the tractor mechanism, and a second paper sensor is provided at the position of the print head. When the power is turned on, the front end of the print paper is moved to a predetermined position. The print paper is fed back to the position where the second paper sensor detects the leading edge, and then forward-fed, so as to perform the cueing to match. Then, when the leading edge of the forwardly fed printing paper is detected by the first paper sensor, the printing head is driven and printing is started.

JP-A-8-244296

By the way, in the paper sensor or the like provided in the tractor mechanism unit, the guide plate for preventing the printing paper (recording medium) from floating is provided in the tractor mechanism unit, so the printing paper pressed by the paper pressing force of the guide plate Sensors (including microswitches) with mechanical movers are used to actuate. The mover is brought into sliding contact with the normally fed printing paper and is turned from the standing position to the recumbent position to turn on the sensor body.
If a sensor having this kind of mover is used as the second paper sensor in the conventional paper feeding mechanism, the leading edge of the printing paper can be mechanically detected with high accuracy. However, if the printing paper is fed backward to perform cueing, the mover may rotate from the lying position to the standing position due to friction at the time of sliding contact, which may cause false detection in the detection of the leading edge of the printing paper. .

  The present invention provides a control method for a medium feeding device, a medium feeding device, and a printing system, in which a movable element is in a detection unit that moves only by forward feeding of a recording medium, and normal detection is possible even if reverse feeding is performed. The challenge is to do.

The method for controlling a medium feeding device according to the present invention includes a medium feeding unit configured to be able to forward and backward feed a recording medium along a feeding path, a mover that can move forward and backward in the feeding path, and a position of the mover And a detection mechanism configured to move the mover by forward feeding of the recording medium from a state in which the recording medium is not present in the feeding path. Then, after carrying out reverse feed beyond the target stop position by the media feed unit, when performing normal feed to the target stop position, when performing reverse feed, the detection unit main body should be in the detection mask state It is characterized by.
In this case, it is preferable to place the detection unit main body in the detection mask state when reverse feed is performed beyond the target stop position.

  In this case, it is preferable that the target stop position is a position where the leading end of the recording medium is detected by the detection unit.

According to these configurations, when the reverse feed is performed by the medium feeding unit, the reverse feed is performed beyond the target stop position, and then the normal feed is performed to the target stop position. Even if the recording medium is moved by forward feeding, the mover can be reliably moved at the target stop position. That is, the movable element is in a detection unit that moves by forward feeding of the recording medium, and normal detection can be performed even if reverse feeding is performed. In addition, by setting the target stop position to a position where the tip is detected by the detection unit, the recording medium can be accurately cued.
According to this configuration, the movement of the mover during reverse feed causes noise for the detection unit main body, but the detection unit main body is placed in the detection mask state during reverse feed, so that the noise can be removed. it can. Therefore, the recording medium can be reliably detected.
The detection unit body is preferably an optical sensor or a micro switch.

  In these cases, it is preferable that the medium feeding unit has a tractor mechanism for feeding a recording medium with sprocket holes, and the detection unit is incorporated in the tractor mechanism.

  According to this configuration, it is possible to reliably detect the setting of the recording medium, that is, the presence or absence of the recording medium, even if the recording medium is set to the tractor mechanism in various positions. Further, the forward and backward feeding of the recording medium can be performed with high accuracy.

  In this case, it is preferable to place the detection unit main body in the detection mask state when reverse feed is performed beyond the target stop position.

  According to this configuration, the movement of the mover during reverse feed causes noise for the detection unit main body, but the detection unit main body is placed in the detection mask state during reverse feed, so that the noise can be removed. it can. Therefore, the recording medium can be reliably detected.

  The movable element includes a member main body that protrudes from the support shaft around the support shaft, and a light shielding piece portion that shields the detection light from the detection portion main body, and an upright position where the member main body protrudes from the feed path. It is preferable that the member main body has a tilting body that tilts to the recumbent position retracted from the feed path, and a spring that biases the tilting body toward the standing position, and the detection unit main body is a photodetector. .

  According to this configuration, it is possible to reliably detect the recording medium with a simple structure without causing erroneous detection.

  The medium feeding device according to the present invention detects a medium feeding portion configured to be able to forward and backward feed a recording medium along a feeding path, a mover that can move forward and backward in the feeding path, and a position of the mover. A detection mechanism having a detection unit main body and configured to move the mover by forward feeding of the recording medium from a state in which there is no recording medium in the feeding path, and the medium feeding unit are controlled and reversed by the medium feeding unit. A control unit that performs forward feed to the target stop position after performing reverse feed beyond the target stop position when performing feed, and the control unit detects when the reverse feed is performed. The main body is in a detection mask state.

According to this configuration, when the reverse feed is performed by the medium feeding unit, the reverse feed is performed beyond the target stop position, and then the normal feed is performed to the target stop position. Even if it moves only by forward feeding of the medium, the mover can be reliably moved at the target stop position. That is, the movable element is in a detection unit that moves only by forward feeding of the recording medium, and normal detection is possible even if reverse feeding is performed.
According to this configuration, the movement of the mover during reverse feed causes noise for the detection unit main body, but the detection unit main body is placed in the detection mask state during reverse feed, so that the noise can be removed. it can. Therefore, the recording medium can be reliably detected.

  The printing system of the present invention includes the above-described medium feeding mechanism and a printing unit that performs printing on a recording medium in synchronization with the normal feeding of the medium feeding unit.

  According to this configuration, since the recording medium can be reliably detected, the print quality and the reliability of the apparatus can be improved.

It is explanatory drawing of the printing system which concerns on embodiment of this invention. It is sectional drawing around the medium detection sensor which concerns on embodiment. It is a flowchart in the reverse feed operation of a recording medium.

Hereinafter, a printing system according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory diagram of a printing system mainly composed of a printing apparatus. As shown in the figure, the printing system 1 is connected to a printing apparatus 2 constituted by an ink jet printer and the printing apparatus 2 via an interface. The host computer 3 is provided. The printing apparatus 2 uses a recording medium 4 with sprocket holes (hereinafter referred to as “recording medium”) 4 as a printing object, performs printing based on a print job received from the host computer 3, and performs a desired operation based on a control command. The medium feeding operation (paper feeding operation) is performed. Note that the printing apparatus 2 according to the embodiment is configured to be able to introduce not only perforated continuous paper but also cut paper (all with sprocket holes) as the recording medium 4.

  As shown in FIG. 1, the printing apparatus 2 includes a feed path 13 extending substantially horizontally from the paper feed port 11 toward the paper discharge port 12, and along the feed path 13, the paper feed port 11 side. In this order, a medium feeding unit 14, a printing unit 15, and a paper discharge unit 16 are provided. The printing apparatus 2 includes a controller 17 that controls the medium feeding unit 14, the printing unit 15, the paper discharge unit 16, and the like and links (connects) with the host computer 3. A storage unit 19 such as a RAM is provided.

  The medium feeding section 14 is engaged with the sprocket hole to send the recording medium 4, the tractor mechanism 21 that sends the recording medium 4 in cooperation with the tractor mechanism 21, the tractor mechanism 21, and the nip roller mechanism 22. And a belt transmission mechanism 24 for transmitting the power of the feed motor 23 to the tractor mechanism 21 and the nip roller mechanism 22. The nip roller mechanism 22 includes a nip roller 26 including a driving roller 27 and a driven roller 28, and an encoder 29 that detects a feed amount (feed step number) of the recording medium 4 by the nip roller 26.

  The tractor mechanism 21 is disposed in the vicinity of the downstream side of the paper feed port 11, and the nip roller mechanism 22 is disposed in the vicinity of the upstream side of the printing unit 15, and the tractor mechanism 21 and the nip roller mechanism 22 are recorded. The medium 4 is spaced apart in the feed direction. For this reason, the recording medium 4 is sent from the tractor mechanism 21 to the nip roller mechanism 22. In this case, the medium feeding speed of the nip roller mechanism 22 is designed to be slightly higher than the medium feeding speed of the tractor mechanism 21, and the recording medium 4 is fed in a stretched state. Further, a medium guide 31 that guides the feeding of the recording medium 4 along the feed path 13 is disposed between the tractor mechanism 21 and the nip roller mechanism 22, and is further positioned downstream of the medium guide 31. A medium edge detection sensor 32 that detects the leading edge or tail edge of the recording medium 4 is provided. Further, the tractor mechanism 21 incorporates a medium detection sensor 33 that detects the presence or absence (set state) of the recording medium 4.

  The printing unit 15 includes an inkjet head 42 mounted downward on the carriage 41, and a carriage that reciprocates the inkjet head 42 via the carriage 41 in a direction orthogonal to the feeding direction of the recording medium 4 (width direction of the recording medium 4). A moving mechanism 43 and a medium support plate (platen) 44 positioned directly below the inkjet head 42 and facing the nozzle surface 42a of the inkjet head 42 in parallel with a predetermined gap are provided. An ink cartridge (not shown) is mounted on the carriage 41 so as to be located above the inkjet head 42, and ink is supplied from the ink cartridge to the inkjet head 42. The nozzle surface 42 a of the inkjet head 42 is provided with a nozzle row 45 (in practice, a plurality of nozzle rows for each color) in which a plurality of ejection nozzles 45 a are arranged in the medium feeding direction, and upstream of the nozzle row 45. A width detection sensor 46 that mainly detects the width of the recording medium 4 is provided at a position that is out of position.

  The carriage moving mechanism 43 extends in the width direction of the recording medium 4 and includes two guide rods 51 and 51 that slidably support the carriage 41, a timing belt 52 that is partially fixed to the carriage 41, and a timing belt. And a carriage motor 53 that causes the vehicle 52 to travel in both forward and reverse directions. When the carriage motor 53 rotates forward and backward, the carriage 41 guided by the two guide rods 51 and 5 reciprocates in the width direction of the recording medium 4 via the timing belt 52. Printing on the recording medium 4 is performed by driving the inkjet head 42 in synchronization with the forward and / or backward movement of the reciprocating motion (so-called main scanning).

  The paper discharge unit 16 rotates the paper discharge roller 61 and the paper discharge drive roller 62, which are composed of a drive-side paper discharge drive roller 62 and a driven star wheel 63 that sandwich and rotate the recording medium 4 while slipping. A paper discharge motor 64. The paper discharge driving roller 62 located on the lower side rolls on the back surface of the recording medium 4 to apply a feeding force to the recording medium 4, while the star wheel 63 located on the upper side is urged toward the paper discharge driving roller 62 side. In this state, it is in rolling contact with the recording surface (surface) of the recording medium 4 while freely rotating. In this case, the medium feeding speed of the nip roller mechanism 22 is designed to be slightly slower than the medium feeding speed of the paper discharge driving roller 62, and the recording medium 4 is slip-rotated by the paper discharge driving roller 62. Thus, the sheet is fed along the medium support plate 44 in a tensioned state, and is further fed out of the apparatus from the sheet discharge port 12 (sheet discharge).

Here, the basic control operation of the printing apparatus 2 performed by the controller 17 based on the print job and control command of the host computer 3 will be described.
First, after the user sets the recording medium 4 in the tractor mechanism 21, the mechanism system is initialized. This initialization is started by closing a lid (not shown) of the printing apparatus 2 covering the medium feeding unit 14 or the like, or by operating a button after closing the lid. When the initialization is started, the tractor mechanism 21 and the nip roller mechanism 22 start driving via the feed motor 23 on the assumption that the medium detection sensor 33 detects “presence” of the recording medium 4. As a result, the recording medium 4 set in the tractor mechanism 21 is sent along the feed path 13 to the medium guide 31, the nip roller mechanism 22, and further to the printing unit 15. More specifically, the front end of the recording medium 4 sent out from the tractor mechanism 21 is detected by the medium end detection sensor 32, and the feed motor 23, which is a step motor, sends a predetermined number of feed steps from this front end detection. Stop. As a result, the front end of the recording medium 4 stops at the position of the so-called first nozzle (first ejection nozzle 45a), that is, the initialization position 48, which is located at the downstream outermost end in the nozzle row 45 of the inkjet head 42. To do.

  Subsequently, the carriage 41 reciprocates once so as to cross the recording medium 4, and a width detection sensor 46 provided on the carriage 41 detects the width of the recording medium 4. This detection result is collated with the setting result of the recording medium 4 in the host computer 3 (when it does not match, the setting change or the replacement of the recording medium 4 is prompted). On the other hand, the position of the carriage 41 is detected by a sensor (not shown) when it returns to its original position. As a result, the home position of the inkjet head (carriage 41) 42 is determined. In this way, the mechanical system is initialized.

  Subsequently, when a print command is issued (print job), if the upper margin is set in advance, the recording medium 4 in the upper margin is fed, and then the printing operation is started. In the printing operation, ink ejection (printing: main scanning) is performed based on the print data while the inkjet head (carriage 41) 42 moves forward with respect to the recording medium 4 in the stopped state. This print width is the length of the nozzle row 45 of the inkjet head 42, and the discharge roller 61 is driven in addition to the tractor mechanism 21 and the nip roller mechanism 22 prior to the subsequent backward movement of the inkjet head 42. The recording medium 4 is sent by the length of the nozzle row 45 (strictly speaking, the nozzle row length + 1 nozzle pitch) (line feed: sub-scan). When the line feed (intermittent feed) for this nozzle row 45 is completed, the inkjet head 42 shifts to the backward movement, and printing (ink ejection) is performed in the same manner as in the forward movement.

In this way, the ink ejection (main scanning) accompanying the reciprocation of the inkjet head 42 and the intermittent feeding (line feed: sub-scanning) of the recording medium 4 are repeated, so that the recording medium 4 can be printed based on the print data. Is printed. On the other hand, the printed portion of the recording medium 4 is sent out of the apparatus from the paper discharge port 12 while being slip-fed by the paper discharge roller 61.
Here, when the recording medium 4 is a cut sheet, the recording medium 4 has passed the discharge roller 61 at the tail end (for example, a predetermined feed stop number is sent from the end detection of the medium end detection sensor 32). Then, the driving of the paper discharge roller 61 and the like is stopped, and the printing operation is finished.

  On the other hand, when the recording medium 4 is continuous paper, the final main scanning is finished (actual printing is finished), and when the printed portion is sent out of the paper discharge port 12 in units of perforations, the paper discharge roller The drive of 61 etc. is stopped. Here, the user cuts off the printed portion of the recording medium 4 using a perforation, and commands reverse feeding of the recording medium 4 by a button operation or the like. When reverse feed is commanded, the tractor mechanism 21, the nip roller mechanism 22, and the paper discharge roller 61 are reversed, and the recording medium 4 is positioned at the tractor mechanism 21, that is, until the front end is detected by the medium detection sensor 33. Pulled back (cue). In the case of continuous paper, the printing operation ends here. Thereafter, the user commands the same operation as described above, or commands the same operation as described above after replacing the recording medium 4 (paper replacement).

  Next, referring to FIGS. 1 and 2, the structure of the tractor mechanism 21 (medium feeding unit) and the medium detection sensor 33 (detection unit) provided on the tractor mechanism 21 will be described in detail, and FIGS. 1 and 3 will be referred to. A method for controlling the above-described pull back operation (reverse feed operation) of the recording medium 4 by these mechanisms will be described.

  As shown in FIGS. 1 and 2, the tractor mechanism 21 includes a pair of left and right mechanism portions (only one is shown) 71, and a drive shaft 72 and a driven shaft 73 passed between the pair of mechanism portions 71. . Each mechanism 71 includes a drive pulley 75 fitted to a drive shaft 72 having a rectangular cross section, a driven pulley 76 provided on the driven shaft 73, and a sprocket belt 77 spanned between the drive pulley 75 and the driven pulley 76. Have. A plurality of projections 77a corresponding to the sprocket holes of the recording medium 4 (same arrangement pitch) are provided on the outer peripheral surface of the sprocket belt 77, and the outer peripheral surface of the sprocket belt 77 located above the sprocket belt 77 is the above-described feed path. 13 is arranged to match 13. In addition, each mechanism portion 71 is provided with a press plate 78 that guides the feeding of the recording medium 4 set on the sprocket belt 77 and that can lift the recording medium 4 up and down. The presser plate 78 is configured to be movable up and down around the left and right outer ends, and has openings (not shown) through which the plurality of protrusions 77a of the traveling sprocket belt 77 escape.

  A sprocket hole located at the tip of the recording medium 4 is fitted into the protrusion 77a of the sprocket belt 77, and the recording medium 4 is set by pulling down the presser plate 78 in this state. When the recording medium 4 is set, the medium detection sensor 33 is turned ON (detection of “present” of the recording medium 4), and the tractor mechanism (feed motor 23) 21 can be driven. When the feed motor 23 is driven, the sprocket belt 77 travels and the recording medium 4 is fed by the plurality of protrusions 77a. The forward / reverse feeding of the recording medium 4 is controlled mainly based on the detection results of the medium end detection sensor 32, the medium detection sensor 33, and the encoder 29 provided in the nip roller mechanism 22.

  As shown in FIG. 2, the medium detection sensor 33 is disposed between the pair of mechanism portions 71 and includes a movable element 81 that is mechanically operated by the recording medium 4 and a photo interrupter (transmission type optical sensor). And a configured sensor main body 82 (detection unit main body). The movable element 81 includes a member main body 84 having a protruding portion 84 a protruding into the feed path 13, and a light shielding piece 85 that extends downward from the member main body 84 and passes on or off the detection light of the sensor main body 82 to be turned on and off. And a tilting body 83 formed integrally with each other. Further, the mover 81 has a spring 86 that biases the tilting body 83 in one direction. The tilting body 83 is rotatably supported by the driven shaft 73 of the tractor mechanism 21 between the standing position where the projecting portion 84a of the tilting body 83 projects into the feed path 13 and the recumbent position retracted from the feed path 13. Has been. The projecting portion 84a of the tilting body 83 projecting into the feed path 13 is formed in a mountain shape, and the tilting body 83 rotates to the driven shaft 73 at a position offset from the top of the projecting portion 84a to the paper feed port 11 side. It is supported freely. The spring 86 urges the tilting body 83 toward the standing position. On the slopes on both sides of the projecting portion 84a in the transport direction, the slope in the forward direction of paper feed is longer in the reverse feed direction than the slope in the reverse feed direction and has a gentle angle. When the paper is fed in the forward direction, the recording medium 4 hits more smoothly and then can slide smoothly.

  When the recording medium 4 does not exist on the tractor mechanism 21, the tilting body (movable element 81) 83 is rotated to the upright position by the spring 86, and the light shielding piece 85 on the opposite side of the driven shaft 73 is separated from the sensor body 82. It has been rotated to a position dislocated downstream (see FIG. 2A). Accordingly, the sensor main body 82 can determine whether the recording medium 4 is “absent” by the detection light passing through the light-shielding piece 85 and being detected. On the other hand, when the recording medium 4 is present on the tractor mechanism 21, the tilting body (movable element 81) 83 rotates (tilts) against the spring 86 so that the light shielding piece 85 faces the sensor body 82. Is rotated (tilted) (see FIG. 2B). Thereby, the sensor main body 82 can determine “presence” of the recording medium 4 by the detection light being shielded by the light shielding piece 85 and not being detected.

  When the recording medium 4 is set on the tractor mechanism 21, the tilting body 83 is pushed by the recording medium 4, and a force is applied in the direction in which the tilting body 83 is offset downstream from the driven shaft 73. Tilt to a position (turns clockwise as shown in FIG. 2 (a) to FIG. 2 (b)). Further, even when the set recording medium 4 is fed by the tractor mechanism 21 (forward feeding), force is applied to the tilting body 83 in the direction offset from the driven shaft 73 to the downstream side, and the tilting body 83 tilts. To do. On the other hand, when the recording medium 4 is fed back by the tractor mechanism 21, a force is applied to the tilting body 83 in the direction of the driven shaft 73. For this reason, if the frictional force between the recording medium 4 and the tilting body (projecting part 84a) 83 and the catching on the inclined surface of the projecting part 84a are small, the tilting body 83 slides smoothly with the recording medium 4, so that When (the recumbent position) is maintained and the frictional force and the catch are large, the recording medium 4 is rotated to the standing posture (standing position) along with the reverse feed, and then the protruding portion 84a reaches a position where it is retracted from the feed path 13. Until it rotates in the opposite direction. In this case, since the light shielding piece 85 is rotated to a position away from the sensor main body 82, the detection light passes and is detected, and the recording medium 4 is determined to be “none”. In other words, when the recording medium 4 is fed backward by the tractor mechanism 21, the operation of the medium detection sensor 33 becomes unstable, and there is a risk of erroneous detection. Therefore, in the present embodiment, the following control is performed when the recording medium 4 is pulled back (reverse feed operation).

  As shown in the flowchart of FIG. 3, when the reverse feed of the recording medium 4 is instructed (S-1), the presence or absence of the recording medium 4 is first detected by the medium detection sensor 33 (S-2 and S-3). . In other words, it is confirmed whether or not the recording medium 4 is continuous paper (more precisely, whether or not reverse feeding is possible). Here, when “None” of the recording medium 4 is detected, it is determined that the set recording medium 4 is a cut sheet (unfeedable), and this operation flow is ended. On the other hand, when “presence” of the recording medium 4 is detected, the tractor mechanism 21, the nip roller mechanism 22, and the paper discharge roller 61 are driven in reverse to start reverse feeding of the recording medium 4 (S-4).

  In this reverse feed, the leading end detection position of the recording medium 4 by the medium detection sensor 33 is set as a target stop position, and the recording medium 4 is fed to a position where the leading end exceeds the target stop position by several steps upstream. For example, the front end of the recording medium 4 is not detached from the tractor mechanism 21 and is reversely fed to the temporary stop position 49 that completely exceeds the medium detection sensor 33. Specifically, for example, the number of feeding steps corresponding to the distance between the temporary stop position 49 and the medium edge detection sensor 32 is acquired in advance, and the leading edge of the recording medium 4 that has started reverse feeding is detected by the medium edge detection. From the state where the sensor 32 has detected the leading edge, this feed step number is reversely fed to stop the reverse feed of the recording medium 4. As a result, the recording medium 4 stops when the leading end reaches the temporary stop position 49 (S-5). As described above, since detection by the medium detection sensor 33 in the reverse feed is unstable, the controller 17 cannot detect the detection mask state (detection prohibited state) during the reverse feed even if it tries to detect the medium detection sensor 33. ) Is preferable.

  When the recording medium 4 stops at the temporary stop position 49, the tractor mechanism 21 and the nip roller mechanism 22 are driven to rotate forward, and the recording medium 4 is forwardly fed (forward feeding) (S-6). When forward feeding of the recording medium 4 is started, the detection mask state is released, and the presence or absence of the recording medium 4 is detected by the medium detection sensor 33 (S-7 and S-8). Here, when “None” of the recording medium 4 is detected, it is determined that there is a paper feeding error of the recording medium 4 (S-9), and this operation flow is ended. On the other hand, when the leading end of the recording medium 4 tilts the movable element 81 of the medium detection sensor 33 and “presence” of the recording medium 4 is detected, the forward feeding of the recording medium 4 is stopped (S-10), and the operation flow is performed. Exit. Thereby, the pull back operation (cueing) of the recording medium 4 is completed.

  As described above, in the present embodiment, in the pull-back operation of the recording medium 4, after reverse feed is performed beyond the target stop position (tip detection position by the medium detection sensor 33), forward feed is performed to the target stop position. Since the leading edge of the recording medium 4 is detected by the medium detection sensor 33, the movable element 81 can be moved at the target stop position even if the movable element 81 operates stably only by forward feeding of the recording medium 4. The child 81 can be reliably operated. Therefore, the pulling back operation of the recording medium 4 to the tractor mechanism 21, that is, the cueing operation of the recording medium 4 can be performed reliably.

  When the medium end detection sensor 32 has the same structure as the medium detection sensor 33 having the movable element 81, the front end detection position of the recording medium 4 by the medium end detection sensor 32 is set as the target stop position, and the above It is also possible to carry out the pull back operation. That is, the present invention is applicable even when the medium feeding unit and the detection unit are separated from each other, or when the position of the detection unit is different from the target stop position. Further, the present invention is applicable even when the medium feeding unit is a roller mechanism. Furthermore, the printing system 1 of the embodiment can be configured as an integrated apparatus.

  1 printing system, 2 printing apparatus, 3 host computer, 4 recording medium, 13 feeding path, 14 medium feeding section, 15 printing section, 17 controller, 21 tractor mechanism, 22 nip roller mechanism, 29 encoder, 32 media edge detection sensor, 33 Media detection sensor, 48 Initialization position, 49 Temporary stop position, 61 Paper discharge roller, 71 Mechanism, 72 Drive shaft, 73 Drive shaft, 77 Sprocket belt, 81 Movable element, 82 Sensor main body, 83 Tilt body, 84 Member Body, 84a Projection, 85 Light-shielding piece, 86 Spring

Claims (6)

A medium feeding unit configured to be capable of forward feeding and reverse feeding of the recording medium along the feeding path;
A movable element that moves forward and backward in the feed path; and a detector main body that detects a position of the mover, and the movable medium is moved by the forward feeding of the recording medium from a state where the recording medium is not present in the feed path. A detection mechanism configured to move a child, and a control method of a medium feeding device comprising:
After performing the reverse feed beyond the target stop position by the medium feeding unit, when performing the forward feed to the target stop position, the detection unit main body is in a detection mask state when the reverse feed is performed. A method for controlling a medium feeding device, comprising:   The method for controlling a medium feeding device according to claim 1, wherein the target stop position is a position at which the leading end of the recording medium is detected by the detection unit. The medium feeding unit has a tractor mechanism for feeding the recording medium with sprocket holes,
The method for controlling a medium feeding device according to claim 1, wherein the detection unit is incorporated in the tractor mechanism. The movable element includes a member main body that protrudes from the feed path around the support shaft, and the other includes a light-shielding piece that shields detection light from the detection unit main body, and the member main body protrudes from the feed path. A tilting body that tilts from a standing position to a recumbent position where the member body is retracted from the feed path; and a spring that biases the tilting body toward the standing position,
The method of controlling a medium feeding device according to claim 1, wherein the detection unit main body is a photodetector. A medium feeding unit configured to be capable of forward feeding and reverse feeding of the recording medium along the feeding path;
A movable element that moves forward and backward in the feed path; and a detector main body that detects a position of the mover, and the movable medium is moved by the forward feeding of the recording medium from a state where the recording medium is not present in the feed path. A detection mechanism configured to move the child;
A control unit that controls the medium feeding unit and performs the reverse feeding beyond the target stop position when the medium feeding unit performs the reverse feeding, and then performs the forward feeding to the target stop position; With
The said control part makes the said detection part main body a detection mask state, when implementing the said reverse feed, The medium feeding apparatus characterized by the above-mentioned. A medium feeding mechanism according to claim 5;
A printing system comprising: a printing unit that performs printing on the recording medium in synchronization with the normal feeding of the medium feeding unit.

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