Recording device, control method, and program

Abstract

To make both reduction of a time required for recording operation and prevention of a carrying abnormality such as paper jam compatible.SOLUTION: A recording device according to one embodiment of the present invention is provided with: a carrying path through which a recording medium is passed from an upstream side to a downstream side in a carrying direction; carrying means, arranged in the carrying path, which carries the recording medium; detecting means that detects an end part of the recording medium being passed through the carrying path; and control means that executes first control by which the recording medium is carried by the carrying means to the upstream side and second control by which the recording medium is carried by the carrying means to the downstream side. After the detecting means detects a rear end of the recording medium, the control means executes the first control or the second control on the basis of a position of the rear end of the recording medium.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a technique for separating and transporting recording media such as paper one by one in a recording device. [Background technology]

[0002] Conventionally, recording devices include feeding devices that separate and feed recording media one by one. Among these feeding devices, there are automatic feeding devices that perform a feeding preparation operation by returning to a standby position after completing a feeding operation (hereinafter referred to as a feeding preparation operation) by switching the direction in which the drive source rotates between forward and reverse using a missing-tooth gear or the like in a transmission unit connected to the feeding device. In addition to such automatic feeding devices, there are also automatic feeding devices that reverse the running of recording media for purposes such as aligning the recording media. Furthermore, in order to reduce the size and cost of the device, there are automatic feeding devices that use the drive source of the aforementioned feeding device as a drive source for a transport device that transports recording media to a recording unit located downstream of the feeding device in the transport direction.

[0003] Among recording devices equipped with this type of automatic feeding device, some perform a so-called feeding and discharging operation, in which, when recording onto multiple recording media, the recording medium to be recorded on is fed out of the automatic feeding device before the recorded recording medium is completely discharged, in order to shorten the time required for recording.

[0004] In such a recording device, in order to feed the next recording medium from the feeding device by a feeding / ejecting operation, it is necessary to perform a feeding preparation operation while the recorded recording medium remains in the transport path of the transport device. However, as mentioned above, if the driving source of the feeding device and the driving source of the feeding device are the same, when the driving direction of the driving source is switched by the feeding preparation operation, the recording medium remaining in the transport path of the transport device will be pulled from the conveying device side to the feeding device side. Therefore, depending on the position of the remaining recording medium, the edge of the recording medium may get caught on the guide members or transport rollers of the transport path, causing problems such as paper jams.

[0005] To address the above problem, Patent Document 1 discloses a method for preventing paper jams by performing a feeding preparation operation after the recorded recording medium has been completely discharged from the conveying device. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2002-332142 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in Patent Document 1, there is a problem that the feeding and discharging operation cannot be performed when a recorded recording medium remains in the conveying device, which increases the time required for the recording operation. In view of the above problem, the present disclosure aims to achieve both a reduction in the time required for the recording operation and the prevention of conveyance abnormalities such as paper jams. [Means for solving the problem]

[0008] One embodiment of the present invention is a recording device comprising: a feed roller that feeds a recording medium; a transport path through which the recording medium fed by the feed roller passes from upstream to downstream in a transport direction; a transport roller disposed in the transport path and rotating in a first direction that transports the recording medium downstream and a second direction that transports the recording medium upstream; and a control unit that executes a first control for transporting the recording medium upstream by the transport roller and a second control for transporting the recording medium downstream by the transport roller, wherein the transport path has a first area and a second area that is different from the first area and includes at least a vicinity of the transport roller, and when a second recording medium following a first recording medium is fed by the feed roller, the control unit executes the first control when a trailing edge of the first recording medium is located in the first area, and executes the second control when the trailing edge is located in the second area. and after the trailing edge reaches the first region, the conveying roller is rotationally driven in the second direction to convey the first recording medium upstream. The recording device is characterized by the above. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to achieve both a reduction in the time required for a printing operation and prevention of transport abnormalities such as paper jams. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing the appearance of an inkjet recording apparatus; [Figure 2] Perspective view of the feeding section [Figure 3] Cross-sectional view of the feeding section [Figure 4] Cross-sectional view of the pressure plate in a direction parallel to the recording medium loading surface [Figure 5] Exploded perspective view of the separation roller unit [Figure 6] FIG. 10 is a perspective view of a drive unit provided in a feeding unit; [Figure 7] Perspective view of the conveying section [Figure 8] Cross-sectional view of the conveying section showing the conveying path [Figure 9] Schematic diagram showing the transport path [Figure 10] Schematic diagram showing permitted and prohibited areas on a conveyance path [Figure 11] Block diagram showing the control configuration of the recording device [Figure 12] Recording operation flowchart [Figure 13] Flowchart of feeding and discharging operation [Figure 14] An explanatory diagram of the feeding and ejecting operation when recording is completed in a prohibited area [Figure 15] An explanatory diagram of the feeding and ejecting operation when printing is completed in the permitted area [Figure 16] An explanatory diagram of the operation when the recording unit is located directly above the recording medium. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments are not intended to unnecessarily limit the invention according to the claims. Furthermore, although multiple features are described in the following embodiments, not all of these multiple features are necessarily essential to realizing the ideas of the present disclosure, and multiple features may be combined arbitrarily. Furthermore, in the accompanying drawings, the same reference numerals are used to designate identical or similar components, and redundant explanations may be omitted.

[0012] In this specification, "recording" does not only refer to the formation of meaningful information such as characters or figures. "Recording" broadly refers to the formation of images, designs, patterns, etc. on a recording medium, or the processing of a medium, regardless of whether the information is meaningful or insignificant, and regardless of whether it is visible to humans or not. Note that "recording" can also be referred to as printing or printing.

[0013] In addition, "recording medium (paper)" does not only refer to recording paper used in general image forming devices, but also broadly includes any medium that can be transported by a recording device, such as cloth, plastic film (OHP), metal plate, glass, ceramics, wood, leather, etc.

[0014] [First embodiment] <General configuration of inkjet recording device> First, an outline of the inkjet recording apparatus (hereinafter simply referred to as "recording apparatus") according to this embodiment will be described.

[0015] Fig. 1 is a perspective view showing an overview of a recording device according to this embodiment. Recording device 1 has a feeding unit 2 that separates and feeds recording media one by one, a transport unit 5 that transports the recording media fed by feeding unit 2, and a recording unit 7. Recording device 1 also has a drive motor 6 (not shown in Fig. 1, see Fig. 6) and a discharge unit 8 that discharges and stacks recording media that have been recorded on by recording unit 7.

[0016] The feeding unit 2 has a stacking unit 21 on which recording media are stacked, and a feeding roller 22 that feeds the recording media stacked on the stacking unit 21. The transporting unit 5 has a transport roller 51, a pinch roller 52 that faces the transport roller 51, a discharge roller 53, and a transport spur 54 that faces the discharge roller 53. The discharge unit 8 has a paper output tray 81 on which the recording media discharged by the discharge roller 53 are stacked.

[0017] The recording medium fed by the feed roller 22 from the feed unit 2 is nipped between the pinch roller 52, which is biased against the conveyance roller 51 by the pinch roller holder 55, and the conveyance roller 51, and is then conveyed to the recording unit 7. Ink is ejected from nozzles (not shown) in a recording head (not shown) onto the recording medium conveyed to the recording unit 7, and an image is recorded on the recording medium. In the recording unit 7, the recording head moves back and forth along the scanning direction in the figure, allowing the recording operation to be performed at any position in the X direction (also called the recording medium width direction) of the recording medium. The recording medium on which the image has been recorded in the recording unit 7 is discharged to the paper discharge tray 81 by discharge rollers 53 and conveyance spurs 54, which serve as discharge means. Note that with regard to the conveyance path from the feed unit 2 through the conveyance unit 5 to the discharge unit 8, the feed unit 2 side is referred to as the "upstream side" in the conveyance direction, and the discharge unit 8 side is referred to as the "downstream side" in the conveyance direction.

[0018] The drive motor 6 is coupled to the transport roller 51, discharge roller 53, and feed unit 2 by a gear train (not shown), rotatably driving each of them. The rotation direction when the transport roller 51 transports the recording medium downstream by the driving force of the drive motor 6 is referred to as the "forward direction." The rotation direction when the transport roller 51 transports the recording medium upstream is referred to as the "reverse direction."

[0019] Between the feeding unit 2 and the conveying unit 5, when the path of the conveyed recording medium is used as a reference, a pinch roller holder 55 is arranged on the upper side (+Z direction side) in Fig. 1, and a guide unit 56 (not shown) is arranged on the lower side (-Z direction side), each of which guides the conveyed recording medium. Furthermore, between the conveying roller 51 and the discharge roller 53, when the path of the conveyed recording medium is used as a reference, a platen 58 is arranged on the lower side (-Z direction side) in Fig. 1, which guides the recording medium conveyed to the recording unit 7 so as to maintain a constant distance between the nozzles and the recording medium.

[0020] <Configuration of feeding section> Fig. 2 is a perspective view of the feeding unit 2. Fig. 3 is a cross-sectional view of the feeding unit 2 as viewed from the X direction. The feeding unit 2 is made up of a recording medium stacking unit, a feeding / separating unit, and a driving unit.

[0021] The recording medium stacking section is made up of a tray 23, a pressure plate 24, side guides 25a and 25b, and a stacking detection section 26. The pressure plate 24 is a pressure plate that applies a conveying force to the recording medium. The pressure plate 24 is urged to rotate toward the feed roller 22 by a pressure plate spring (not shown), and a cam provided in the drive section presses the pressure plate 24, causing it to rotate in a direction away from the feed roller 22. This urging and separation action causes the recording medium to be fed.

[0022] When the feeding unit 2 is not feeding a recording medium, i.e., when it is in a standby state, the pressure plate 24 is fixed at a predetermined position away from the feeding roller 22. At this predetermined position, a gap sufficient to allow multiple recording media to be stacked is secured between the feeding roller 22 and the pressure plate 24.

[0023] 4 is a cross-sectional view of the pressure plate 24 in a direction parallel to the recording medium stacking surface. The side guides 25a and 25b are slidably attached to the pressure plate 24, and the movement of the side guides 25a and 25b is linked by connecting a rack portion 252 provided on the side guides 25a and 25b with a side guide gear 253. The side guide gear 253 is biased perpendicular to the direction of rotation by a side guide spring (not shown). This allows the side guides 25a and 25b to operate only when they receive a certain level of operating force, and the side guides 25a and 25b can be fixed to prevent inadvertent movement due to other biasing and separating operations of the pressure plate 24, vibrations caused by the drive source, or when the user transports the recording device.

[0024] After multiple recording media are loaded in the gap between the feed roller 22 and the pressure plate 24, the side guides 25a and 25b are moved to match the width of the recording media so that the regulating surfaces 251a and 251b of the side guides 25a and 25b regulate the lateral width direction of the recording media. This regulates the movement of the loaded recording media in a direction perpendicular to the recording media conveyance direction (recording media width direction), making it possible to accommodate any recording media width within a predetermined width range and stably feeding recording media of different widths.

[0025] As shown in Fig. 3, the loading detection unit 26 is composed of a loading detection lever 261 and an optical sensor 263 that functions as a loading detection sensor 808 (see Fig. 11) described later. The loading detection lever 261 is rotatably disposed above the pressure plate 24 and is biased toward the pressure plate 24 by a loading detection spring 264. The loading detection lever 261 is molded from a material that is opaque to infrared light, and when a flag portion 262 passes between the light-emitting and light-receiving portions of the optical sensor 263, the output of the optical sensor 263 changes, making it possible to detect the position of the loading detection lever 261. When no recording media are loaded on the stacker 21, the flag portion 262 is located outside the light-emitting and light-receiving portions of the optical sensor 263, and sensor detection is turned off. When recording media are loaded on the stacking section 21, the tip of the loading detection lever 261 comes into contact with the loaded recording media and the loading detection lever rotates, positioning the flag section 262 between the light emitting and light receiving sections of the optical sensor 263 and turning on the sensor detection. This makes it possible to determine whether or not recording media are loaded on the stacking section 21.

[0026] Next, the configuration of the feeding / separating section will be described. The stacked recording media are pressed against the feed roller 22 by the operation of the pressure plate 24 described above. The feed roller 22 is driven to rotate when a recording medium is pressed against it, and the uppermost recording medium in contact with the feed roller 22 is transported by the frictional force of the feed roller 22. Because the feed roller 22 feeds the recording media by frictional force, it is preferable that the roller be made of a material such as rubber with a high friction coefficient, such as EPDM, or urethane foam.

[0027] Here, since the frictional force between the feed roller 22 and the top recording medium is often greater than the frictional force between the top recording medium and the recording medium immediately below it, only the top recording medium is often transported. However, there are cases where the feed roller 22 pulls out multiple recording media at once, for example, when there are burrs on the edges of the recording media that are created when the recording media are cut, when recording media stick together due to static electricity, or when recording media with an extremely high surface friction coefficient are used.

[0028] In such a case, only the topmost recording medium is separated by a separation roller 27, which is a separating means equipped with a torque limiter. The separation roller 27 is pressed against the feed roller 22 so as to abut on the downstream side in the conveying direction from the point where the feed roller 22 and the recording medium first come into contact with each other.

[0029] Here, the configuration of the separation roller 27 will be described. Figure 5 is an exploded perspective view of the separation roller unit. The separation roller 27 is fixedly attached to a clutch cylinder 272, and a clutch shaft 273 is rotatably housed inside the clutch cylinder 272. A clutch spring 271 is wound around the clutch shaft 273, and one of the winding ends of the clutch spring 271 is engaged with the clutch cylinder 272.

[0030] In the above configuration, when the separation roller 27 and the clutch cylinder 272 are rotated in the direction of the arrow in Figure 5 with the clutch shaft 273 fixed, the clutch spring 271 wound around the clutch shaft 273 is released from the clutch shaft 273. When the separation roller 27 and the clutch cylinder 272 rotate by a predetermined angle, the clutch shaft 273 and the clutch spring 271 slide relative to each other, thereby maintaining a predetermined torque.

[0031] The surface of the separation roller 27 is made of rubber, urethane foam, or the like so that it has a friction coefficient similar to that of the feed roller 22. The separation roller 27 is rotatably supported by a separation roller holder 274, which is a separation means holding member, via a clutch cylinder 272 and a clutch shaft 273, and is pressed against the feed roller 22 by a separation roller spring 275.

[0032] With this configuration, when no recording medium is interposed between the feed roller 22 and the separation roller 27, the separation roller 27 rotates in response to the rotation of the feed roller 22.

[0033] When one recording medium falls between the feed roller 22 and the separation roller 27, the frictional force between the feed roller 22 and the recording medium is greater than the frictional force between the separation roller 27, which rotates at a predetermined torque, and the recording medium. Therefore, the recording medium is conveyed while the separation roller 27 is rotated. However, when two recording media fall between the feed roller 22 and the separation roller 27, the frictional force between the feed roller 22 and the recording medium on the feed roller 22 side becomes greater than the frictional force between the recording media. Furthermore, the frictional force between the recording medium on the separation roller side and the separation roller 27 becomes greater than the frictional force between the recording media, causing slippage between the recording media. As a result, only the recording medium on the feed roller 22 side is conveyed, while the recording medium on the separation roller 27 side stops in place as the separation roller 27 stops rotating and is not fed.

[0034] Next, the configuration of the double-feed prevention unit will be described. As described above, even when about two recording media enter the nip between the feed roller 22 and the separation roller 27, it is possible to separate the recording media. However, if more than two recording media enter, or if two recording media enter and only the recording media on the feed roller 22 side are fed, and then an attempt is made to feed the next recording media while leaving the recording media near the nip, problems can arise. Specifically, there is a possibility that multiple recording media will be fed at the same time, a so-called double-feed. A double-feed prevention unit is provided to prevent such double-feeds.

[0035] The double-feed prevention unit has a return lever 28, which, when setting a recording medium or when waiting to record, moves into the recording medium transport path to prevent the leading edge of the recording medium from accidentally getting too far into the feeding unit. The return lever 28 is configured to open after the feeding operation starts and retreat from the recording medium transport path, so the return lever 28 does not interfere with the progress of the recording medium during feeding.

[0036] When the separation operation is completed, the return lever 28 begins to return the recording medium located in the separation nip (between the feed roller 22 and the separation roller 27) due to the action of a cam provided on the control gear 31. At that time, the release cam 32 also moves the front-stage regulating member, the front-stage regulating holder 29, and the separation roller holder 274 equipped with the separation roller 27, in a direction away from the feed roller 22. The movement of the front-stage regulating holder 29 and the separation roller holder 274 away from each other makes it possible for the return lever 28 to perform the return operation of the recording medium with little force.

[0037] The return lever 28, which has completed the return operation of the recording medium, rotates once to a position where it retreats from the transport path of the recording medium, and after the feeding from the feeding unit 2 is completed, it returns to the standby position again.

[0038] Next, the configuration of the drive unit will be described with reference to FIG. 6. FIG. 6 is a perspective view of the drive unit. The drive unit is composed of an input gear 33, intermediate gears 34 and 35, a control gear 31, a release cam 32, and a roller gear 36. The control gear 31 rotates in conjunction with the release cam 32, rotating from its initial standby position, or standby position, in the direction of the arrow to the paper passing position. Between the standby position and the paper passing position, the release cam 32 presses down or releases a follower (not shown), causing it to rotate, thereby causing the pressure plate 24 to move up and down and the return lever 28 to move back and forth. The drive force is transmitted from the control gear 31 to the roller gear 36, causing the feed roller 22 to rotate. The control gear 31 further rotates in the direction of the arrow from the paper passing position to the standby position. Between the paper passing position and the standby position, the drive force is not transmitted from the control gear 31 to the roller gear 36 because the connection is released by the missing-tooth gear 31a. In addition, the return lever 28 described above is moved from the return position to the standby position. In this way, one rotation of the control gear 31 in the direction of the arrow in the figure causes the feeding unit 2 to perform one feeding operation.

[0039] The feeding unit 2 is connected to the drive motor 6 by a gear train (not shown), and is driven by the driving force input by the input gear 33 to rotate the control gear 31 via intermediate gears 34 and 35. The intermediate gears 34 and 35 have a latch mechanism inside the two-stage gear, and the two-stage gears are connected and can operate when rotating in one direction, but are not connected when rotating in the opposite direction, so that the output-side stage gear rotates freely relative to the input-side gear.

[0040] The control gear 31 is composed of a multi-stage, partially toothed gear. When the input gear 33 drives in the direction of arrow A in the figure, the driving force is transmitted to the partially toothed gear 31b of the control gear 31 via the intermediate gear 34, causing the control gear 31 to rotate in the direction of the arrow in the figure. The partially toothed gear 31b of the control gear 31 is located in the rotational portion from the standby position to the paper passing position described above. As a result, the control gear 31 rotates from the standby position to the paper passing position in response to the drive force from the input gear 33 in the direction A. After the control gear 31 reaches the paper passing position, the partially toothed gear 31b disengages from the intermediate gear 34, cutting off the drive connection between the control gear 31 and the control gear 31, preventing the control gear 31 from rotating any further. At this time, the latch mechanism described above prevents the intermediate gear 35 from transmitting drive to the stepped gear, and no drive force is transmitted to the partially toothed gear 31c of the control gear 31.

[0041] When the input gear 33 drives in the direction of arrow B in the figure, the drive is transmitted to the missing tooth gear 31c of the control gear 31 via the intermediate gears 34 and 35, and the control gear 31 rotates in the direction of the arrow in the figure. The missing tooth gear 31c of the control gear 31 is provided in the rotation portion from the paper passing position to the standby position described above. As a result, in response to the rotational drive in the direction B from the input gear 33, the control gear 31 rotates from the paper passing position to the standby position, and after reaching the standby position, the missing tooth gear 31c disengages from the intermediate gear 35 and the control gear 31, cutting the drive connection and preventing further rotation of the control gear 31. The latch mechanism described above prevents the intermediate gear 34 from transmitting drive to the stepped gear, so no drive force is transmitted to the missing tooth gear 31b of the control gear 31.

[0042] In this way, as the input gear 33 rotates in direction A, the drive unit provided in the feeding unit performs a series of feeding operations from the standby position to the paper passing position. After that, as the input gear 33 rotates in direction B, the drive unit performs a feeding preparation operation from the paper passing position to the standby position. When driven by the rotation amount in direction B required for the feeding preparation operation, the distance that the conveying roller 51 conveys the recording medium upstream in the conveying direction is defined as L1.

[0043] <Configuration of the transport unit and transport path> Fig. 7 is a perspective view of the conveying section, and Fig. 8 is a cross-sectional view in the width direction of the conveying section showing the conveying path from the feeding section to the discharging section.

[0044] The transport roller 51 and the discharge roller 53 are connected to the drive motor 6 via a gear train 37. When the drive motor 6 rotates the transport roller 51 in the direction of arrow A in the figure, the transport roller 51 and the discharge roller 53 each rotate in a direction to transport the recording medium downstream in the transport direction (i.e., the forward direction). When the drive motor 6 rotates the transport roller 51 in the direction of arrow B in the figure, the transport roller 51 and the discharge roller 53 each rotate in a direction to transport the recording medium upstream in the transport direction. A gear train (not shown) connects the transport roller 51 to the input gear 33 of the feed unit 2. When the transport roller 51 rotates in the direction of arrow A, the input gear 33 of the feed unit 2 rotates in the direction of arrow A, i.e., in the direction for the feeding operation. When the transport roller 51 rotates in the direction of arrow B, the input gear of the feed unit 2 rotates in the direction of arrow B, i.e., in the direction for the feeding preparation operation. The drive amount of the drive motor 6 is detected by an encoder (not shown), and the speed and drive amount of the drive motor 6 are controlled by various controls such as PID control.

[0045] The recording medium fed by the feeding unit 2 passes through the transport path indicated by the dotted arrow in FIG. 8, first guided by the pinch roller holder 55 and the guide unit 56, and then fed to the transport roller 51. The pinch roller holder 55 is provided with an edge detection lever 57, which is rotated as the recording medium passes through the transport path to detect the leading or trailing edge of the recording medium. The leading edge of the recording medium is detected during the feeding operation, and the recording operation is performed based on the detection result. Alternatively, if the trailing edge is detected during the ejection operation, the length of the recording medium can be calculated based on the amount of drive motor 6 required to detect the leading edge and the trailing edge. At this time, an error of up to L2 can occur between the calculated paper length and the actual paper length due to factors such as variations in the spring force biasing the edge detection lever.

[0046] The tip 571 of the end detection lever 57 is rotatably installed. Therefore, when the recording medium is transported upstream in the transport direction from the transport roller 51, the tip 571 rotates and moves away from the recording medium, thereby enabling a transport operation that does not damage the recording medium.

[0047] The recording medium fed to the transport rollers 51 undergoes skew correction and other operations before being transported to the recording unit 7. Then, a recording head 71 installed inside the recording unit 7 performs a main scan in which it moves back and forth in a direction perpendicular to the transport direction of the recording medium, thereby recording on the recording medium. The recording medium transported from the transport rollers 51 is guided by a platen 58 and a spur base 59, and then reaches the discharge rollers 53. During the recording operation on the recording medium, the transport operation is performed by the transport rollers 51, the discharge rollers 53, or both, and after the recording operation is completed, the recording medium is discharged to the paper output tray 81 by the discharge rollers 53.

[0048] When performing the feeding and discharging operations described below, in order to perform continuous feeding operations, it is necessary to perform a feeding preparation operation after the feeding operation is completed. For this purpose, the conveying roller 51 is rotated in the direction of arrow B. As a result, the conveying roller 51 and the discharging roller 53 convey the recording medium upstream in the conveying direction.

[0049] <Reverse permitted area, reverse not permitted area> FIG. 9 is a schematic cross-sectional view of the transport path as viewed from the X direction. FIG. 9 shows an area (referred to as an "allowed area") in which reverse rotation of the transport roller 51 is permitted (i.e., reverse rotation of the recording medium is permitted) when a recording medium remains in the transport path, in other words, when the trailing edge of the recording medium is located within the area. It also shows an area (referred to as an "unallowed area") in which reverse rotation of the transport roller 51 is not permitted (i.e., reverse rotation of the recording medium is not permitted) when the trailing edge of the recording medium is located within the area. FIG. 10 is a simplified schematic diagram showing each roller, a guide section at the bottom of the transport path, two allowed areas, and three unallowed areas. Note that L1 is the distance the transport roller 51 moves upstream in the transport direction when the feeding preparation operation is performed. Furthermore, L2 is the maximum error that occurs between the length of the recording medium detected by the edge detection lever 57 and the actual length of the recording medium.

[0050] The permission area is set in two places: around the edge detection lever 57 and on the platen 58. The first permission area (permission area A) is around the edge detection lever 57, and the upper part in the transport direction (+Z direction) is guided by the pinch roller holder 55, and the lower part in the transport direction (-Z direction) is guided by the guide unit 56. Because the pinch roller holder 55 is composed of a single member, there are no joints that exist when the transport path is composed of multiple members, and there is no concern that the trailing edge of the recording medium will get caught on a step when it is reversed. The guide unit 56 is composed of two members, but the joint between the two members is combined in a comb-like shape, so there is no concern that the edge of the recording medium will get caught whether it is coming from the upstream or downstream in the transport direction. In addition, because the tip of the aforementioned edge detection lever 57 rotates, transport from the downstream in the transport direction is possible.

[0051] The second permission area (permission area B) is on the platen. Like the first permission area (permission area A), the platen that guides the lower part in the transport direction is made up of a single member, and this area eliminates the risk of the recording medium getting caught on steps when transported from downstream in the transport direction.

[0052] The non-permitted areas are set in three places: from the upstream of the feed roller 22 to the downstream of the feed roller 22; from the feed section 2 to the transfer point of the guide section 56; and near the transport roller 51.

[0053] The first non-permitted area (non-permitted area A) is near the feed roller, and is an area from upstream of the feed roller 22 to downstream of the feed roller 22. The feed roller 22 can only rotate in one direction, that is, to transport the recording medium downstream in the transport direction (only forward rotation is possible). Therefore, when the recording medium is nipped by the feed roller 22 or when the trailing edge of the recording medium runs in reverse and is re-nipped by the feed roller 22, the recording medium cannot run in reverse toward the upstream side of the feed roller 22. Therefore, if the transport roller 51 is rotated in the reverse direction in such a state, there is a risk of paper jams or scratches on the recording medium.

[0054] The second non-permitted area (non-permitted area B) extends from the feed unit 2 to the transfer point of the guide unit 56. Specifically, the end point of the non-permitted area B is a position L2 downstream in the transport direction from the downstream end of the feed unit base 38 in the transport direction. The recording medium is transferred from the feed unit base 38 to the guide unit 56 on the downstream side of the transport path included in the non-permitted area B. Depending on the error in the length of the recording medium detected by the edge detection lever 57, there is an area where it is unclear whether the trailing edge of the recording medium is on the feed unit base 38 or the guide unit 56. Therefore, if the recording medium is reversed while its trailing edge is being transferred from the feed unit base 38 to the guide unit 56, there is a risk that the recording medium may get caught on the feed unit base 38 and cause a paper jam. The maximum error in the length of the recording medium detected by the edge detection lever 57 is L2. Therefore, if the location is downstream of the point where the control unit determines that the recording medium is further away in the downstream direction from the downstream end of the feed unit base 38 in the conveying direction by L2 or more, the feeding preparation operation can be performed with the actual trailing edge of the recording medium reliably handed over to the guide unit 56. At this time, there is no concern that the recording medium will get caught on the feed unit base 38.

[0055] In this embodiment, a gap is provided between the feed unit base 38 and the guide unit 56 to provide a transport path for paper feed from the lower level, which creates a step, and therefore the gap is designated as a prohibited area. Even in an area where the guide member includes a joint made up of multiple members, if it is possible to connect the guide members in a comb-like shape to prevent them from getting caught in the reverse direction, the area between the feed unit base 38 and the guide unit 56 does not necessarily have to be designated as a prohibited area.

[0056] The third non-permitted area (non-permitted area C) is a location near the conveyance roller 51. Specifically, the non-permitted area C extends from a point L2 upstream in the conveyance direction from the nip point between the conveyance roller 51 and the pinch roller 52 to a point L1 + L2 downstream in the conveyance direction from the nip point. Typically, when conveying a recording medium to a conveyance path in automatic double-sided printing, a configuration is adopted in which the recording medium conveyed downstream from the conveyance roller 51 is re-nipped by running in reverse toward the conveyance roller 51 before being conveyed. However, in such cases, it is common to prevent the recording medium from getting caught on the conveyance roller 51 during re-nipping or paper jams by reducing the conveyance speed during re-nipping or by providing a wait time to set the recording medium before re-nipping. However, when performing feeding and ejection operations, slowing the conveyance speed or providing a wait time to enable re-nipping may actually increase the required time, despite the main objective of reducing the required time for recording. For this reason, in this embodiment, the area near the conveying roller 51 is designated as the non-permitted area. Note that, depending on the embodiment, the area near the conveying roller 51 (downstream side) may be designated as the permitted area. For example, there may be an embodiment in which there is little concern about paper jams even at a normal speed when re-nipping with the conveying roller 51, or an embodiment in which the time required to prevent paper jams by slowing down the conveying speed is shorter than the time required to convey the trailing edge of the recording medium to the next permitted area downstream and then perform the feeding preparation operation.

[0057] Depending on the error in the length of the recording medium detected by the edge detection lever 57, there is a region where it is unclear whether the trailing edge of the recording medium has left the nip of the conveyance roller 51. Specifically, this region corresponds to the region L2 advanced in both the upstream and downstream directions of the conveyance direction, with the nip point of the conveyance roller 51 serving as the reference (starting point). In a region upstream of the conveyance roller 51 in the conveyance direction that is less than L2, the actual trailing edge of the recording medium may be located downstream of the conveyance roller 51 due to a detection error by the edge detection lever 57, and there is a concern that the recording medium may be re-nipped by the conveyance roller 51 during the feed preparation operation. Furthermore, since the feed preparation operation conveys the recording medium upstream in the conveyance direction by a distance L1, there is a concern that the recording medium may be re-nipped by the conveyance roller 51 during the feed preparation operation in a region downstream of the conveyance roller 51 in the conveyance direction that is less than L1 + L2. For this reason, the region from the point L2 advanced upstream from the conveyance roller 51 in the conveyance direction to the point L1 + L2 advanced downstream from the conveyance roller 51 in the conveyance direction is designated as the non-permitted region.

[0058] In this embodiment, examples of non-permitted areas include areas near rollers and areas near the joints of guide members, but the non-permitted areas are not limited to these, and any area where there is a risk of the recording medium getting caught or paper jamming can be designated as a non-permitted area.

[0059] As described above, the entire conveying route can be classified into either a permitted area or a prohibited area. The most downstream area of ​​the conveying route is the permitted area.

[0060] <Control unit> Fig. 11 is a block diagram showing the control configuration of the recording device, and Fig. 12 is a flowchart showing the recording operation by the recording device. The series of steps in the recording operation will be explained using these figures.

[0061] First, a user requests printing, copying, etc. using an input device 801 such as a PC or smartphone, or via an operation unit 805 attached to the recording device. The control unit 802 is composed of a CPU, etc., and upon receiving the request, stores information about the print job related to the request and size information about the recording medium to be recorded in a storage unit 803. The control unit 802 controls the drive motor 6 while reading position information from an encoder 813. The drive motor 6 can transmit driving force to the connected feed unit 2, conveyance unit 5, and discharge unit 8, and these units drive in conjunction with each other. Information indicating the status of the loaded and conveyed recording media is acquired by an edge detection sensor 807 and a stack detection sensor 808.

[0062] When the recording device receives a command for a recording operation from the user, it starts the recording operation shown in Fig. 12. Unless otherwise specified, the processing of each step in Fig. 12 is executed by the CPU included in the control unit 802.

[0063] In step S101, the CPU performs a feeding operation by driving the feeding unit 2 with the driving force generated by the drive motor 6. This feeding operation feeds the recording medium loaded in the stacking unit to the conveying unit. Note that hereinafter, "step S~" will be abbreviated to "S~".

[0064] In S102, the CPU causes the recording unit 7 to perform a recording operation on the recording medium transported to the recording unit 7 by the transport unit 5.

[0065] After the recording operation in S102 is completed, in S103 the CPU determines whether the recording device will continue to perform the next recording. If the determination result in this step is true, the process proceeds to S104. On the other hand, if the determination result in this step is false, the process proceeds to S106.

[0066] If the next recording is to be performed (YES in S103), the CPU performs a determination as to whether to perform feeding and ejecting or a feeding and ejecting operation, which will be described later, in S104.

[0067] In S105, the CPU performs a recording operation on the fed and transported recording medium using the recording unit 7. After S105, the process proceeds to S103, where the CPU again determines whether the recording device will continue to perform the next recording.

[0068] If it is determined that the next recording will not be performed, that is, that the most recent recording operation was the last recording operation (NO in S103), the CPU performs a discharge operation in S106.

[0069] After the discharge operation in S106 is completed, the series of operations ends.

[0070] 12, if an abnormality is detected by the edge detection sensor 807, the stack detection sensor 808, or the encoder 813, error-related processing is executed. Specifically, the display unit 806 displays an appropriate error such as a paper jam error or no paper error, and displays instructions on the display unit 806 for dealing with the error, thereby providing guidance to the user.

[0071] <Execution of feeding and ejecting operation accompanied by determination of feeding and ejecting execution> The execution of the feeding and ejecting operation accompanied by the determination of whether to execute feeding and ejecting will be described below with reference to Fig. 13. Fig. 13 is a flowchart showing a series of steps in the feeding and ejecting operation. In this embodiment, the "feeding and ejecting operation" refers to the feeding operation of the next recording medium (subsequent recording medium) while the recording medium on which recording has been completed (preceding recording medium) remains in the transport path in order to shorten the time required for recording when recording on multiple recording media, and the control for performing such an operation. Unless otherwise specified, the processing of each step in Fig. 13 is executed by the CPU of the control unit 802.

[0072] First, when performing continuous recording operations, in S201 the CPU determines whether the conditions for executing the feed and ejection operation are met. The feed and ejection operation is not necessarily performed when recording on multiple recording media, and the feed and ejection operation may not be performed depending on the settings such as the size and type of recording media and the recording speed. Therefore, the determination process of this step is executed. If the determination result of this step is true, proceed to S203. On the other hand, if the determination result of this step is false, proceed to S202.

[0073] In S202, the CPU performs a discharge operation to discharge the recording medium on which recording has been completed to the discharge unit 8. After this step, a feeding preparation operation (S213) and a feeding / discharging operation (S214) are performed for the next recording medium.

[0074] In S203, the CPU determines whether the recording medium being recorded in the current recording operation is the first recording medium. If the determination result in this step is true, the process proceeds to S204. On the other hand, if the determination result in this step is false, the process proceeds to S206.

[0075] If the recording medium to be recorded is the first one (YES in S203), in S204 the CPU performs only the discharge operation without performing the feeding and discharging operation. The reason for performing only the discharge operation in this step is to measure the length of the stacked recording media, which will be described in detail later.

[0076] In S205, the CPU measures the length of the recording medium (first sheet) on which recording has been completed, and stores the measured length information in the storage unit 803. The length information of the recording medium stored in the storage unit 803 may be erased after the recording operation is completed, or may be stored in the non-volatile storage unit 804 and used for the paper feed / discharge operation of the next or subsequent recording operation.

[0077] If the recording medium to be recorded is the second or subsequent sheet, the subsequent operation is a feeding / discharging operation. To perform the feeding preparation operation, the conveying roller 51 must be rotated in the reverse direction, but the trailing edge position of the recording medium when recording is complete varies depending on the pattern recorded and the size of the recording medium. Therefore, it is necessary to derive the trailing edge position of the recording medium when recording is complete, and then determine whether or not the derived trailing edge position is a position where the recording medium can be conveyed upstream in the conveying direction.

[0078] In S206, the CPU determines whether the rear end of the recording medium on which recording has already been completed has been detected by the edge detection lever 57. If the determination result in this step is true, the process proceeds to S207. On the other hand, if the determination result in this step is false, the process proceeds to S208.

[0079] In S207, the CPU calculates the rear end position of the recording medium on which recording has been completed based on the rear end position of the recording medium detected in S206 and the drive amount of the drive motor 6 from after the rear end was detected until recording was completed. Note that the "rear end position of the recording medium detected in S206" here refers to the position of the edge detection lever 57 in the transport direction and is expressed as a fixed reference value. Also, the "rear end position of the recording medium on which recording has been completed" is an indefinite value based on the drive amount of the drive motor 6. The rear end position of the recording medium on which recording has been completed can be calculated by adding the drive amount of the drive motor 6 to the position of the edge detection lever 57 in the transport direction.

[0080] In S208, the CPU uses the length information stored in the memory unit 803 to calculate the rear end position of the recording medium on which recording has been completed, based on the length of the first recording medium and the driving amount of the drive motor 6 from the time the recording medium on which recording has been completed is fed until the completion of recording.

[0081] In S209, the CPU determines whether the rear end position calculated in S207 or S208 is within the allowable range. If the determination result in this step is true, the process proceeds to S211. On the other hand, if the determination result in this step is false, the process proceeds to S210.

[0082] If the calculated trailing edge position is not within the permitted area (NO in S209), i.e., if it is within the prohibited area, immediately performing the feed preparation operation, i.e., rotating the conveyance roller 51 in the reverse direction, could cause the edge of the recording medium to get caught, potentially resulting in a paper jam. Therefore, in S210, the CPU conveys the recording medium downstream in the conveyance direction by rotating the conveyance roller 51 in the forward direction until the trailing edge position of the recording medium reaches the permitted area closest to the downstream side in the conveyance direction. In this embodiment, since the most downstream area in the conveyance path in the conveyance direction is the permitted area, there is always a permitted area downstream in the conveyance direction of any prohibited area. Therefore, by performing the feed preparation operation after S210, paper jams can be prevented.

[0083] Even if the calculated trailing edge position is within the permitted area, if the trailing edge of the recording medium is located within the recording unit 7, there is a possibility that the recording head 71 will be located above the recording medium immediately after recording is completed. In this case, if the feed preparation operation is performed, that is, if the transport roller 51 is rotated in the reverse direction, the recording medium may come into contact with the recording head 71, which could cause a paper jam or ink stains. Therefore, in S211, the CPU determines whether the trailing edge of the recording medium is located within the recording unit 7. If the determination result in this step is true, the process proceeds to S212. On the other hand, if the determination result in this step is false, the process proceeds to S213.

[0084] In S212, the CPU moves the recording head 71 in the width direction of the recording medium and retracts the recording head 71 to the outside in the width direction of the recording medium. By retracting the recording head 71, it is possible to prevent paper jams and the like caused by the recording medium coming into contact with the recording head 71 during the subsequent feeding preparation operation (S213).

[0085] In S213, the CPU executes a feeding preparation operation.

[0086] When the calculated trailing edge position is within the permitted area, it is possible to immediately perform the feeding preparation operation if the trailing edge of the recording medium is not located within the recording unit 7. Also, even if the calculated trailing edge position is within the permitted area and the trailing edge of the recording medium is located within the recording unit 7, it is possible to immediately perform the feeding preparation operation if the recording head has already been retracted to the outside in the width direction of the recording medium.

[0087] After determining through the series of processes from S201 to S212 described above that there is little risk of a paper jam occurring even if the recording medium is transported upstream in the transport direction, in S213 the CPU performs a feeding preparation operation and rotates the transport roller in the reverse direction.

[0088] After S213, in S214, the CPU switches the conveying direction of the recording medium from the upstream direction to the downstream direction, thereby executing the feeding and discharging operation. This step simultaneously discharges the preceding recording medium on which recording has been completed and feeds the succeeding recording medium as the next recording target.

[0089] In this way, the position of the rear end of the recording medium on which recording has been completed is calculated, and if the rear end is in a position where there is little risk of paper jamming, a feeding preparation operation is performed. This makes it possible to perform feeding and discharging operations under a variety of conditions, thereby achieving both a reduction in the time required for the recording operation and prevention of paper jams.

[0090] The feeding and ejecting operation is controlled based on the trailing edge position of the recording medium after printing is completed. During printing, the length of the recording medium may be estimated and the trailing edge position may be derived using printing data set in a computer or other device and transmitted from the computer. However, the size of the recording medium specified in the printing data may differ from the size of the recording medium actually loaded in the printing device. Therefore, in this embodiment, it is assumed that the recording media loaded in the stacking section are all of the same size. Based on this assumption, the length of the recording medium actually transported during the printing operation for the first recording medium is measured, and the feeding and ejecting operation for the second and subsequent recording mediums is performed based on the measured length data. However, the conditions used for the feeding and ejecting operation are not limited to those described in this embodiment. For example, the trailing edge position of the recording medium may be detected for each printing operation using an edge detection sensor or the like and the detected trailing edge position may be used, or the length information of the recording medium included in the printing data set in the computer or other device may be used.

[0091] <Behavior of recording media during feeding and ejection> The behavior of the recording medium during the feeding and discharging operation will be explained below using the figures. Figure 14 is a cross-sectional view of the area around the conveyance section, showing the series of behaviors of the recording medium after the recording operation is completed when the trailing edge of the recording medium is in the prohibited area C.

[0092] 14(a) shows the state immediately after the printing operation is completed, where the trailing edge of the printing medium is located downstream from the conveyance roller 51 by a distance less than L1 + L2. If the feeding preparation operation is performed in this state, specifically, if the conveyance roller 51 and the discharge roller 53 are rotated in opposite directions, the trailing edge of the printing medium will be conveyed upstream in the conveyance direction by a distance L1. As mentioned above, the maximum error in the length of the printing medium detected by the edge detection lever 57 is L2. Therefore, even if the control unit (CPU) determines that the position of the trailing edge of the printing medium is located at a distance of L1 or more from the conveyance roller 51, there is a concern that the actual position may be less than L1.

[0093] 14(b), even if the trailing edge of the recording medium advances by L1 toward the upstream side in the transport direction, the recording medium is transported in the transport direction to a position (a position L1+L2 away from the transport roller 51) where it will not be re-nipped by the transport roller 51. In other words, the recording medium is transported from the upstream side toward the downstream side until the trailing edge of the recording medium reaches the upstream end of the permitted area B.

[0094] 14(c), the recording medium is then conveyed a distance L1 toward the upstream side in the conveying direction for the feeding preparation operation. At this time, the distance between the conveying roller 51 and the trailing edge of the recording medium is calculated to be L2. Therefore, even if a detection error L2 occurs by the edge detection lever 57, the trailing edge of the recording medium will not be re-nipped by the conveying roller 51. The feeding operation is then performed, and the conveying roller 51 and discharge roller 53 are both rotated in the forward direction, so that the recording medium is discharged to the discharge section 8.

[0095] Next, we will explain what happens when the recording operation ends when the trailing edge of the recording medium is in the permitted area. Figure 15 is a cross-sectional view of the area around the conveyance unit, showing the series of behaviors of the recording medium after the recording operation ends when the trailing edge of the recording medium is in permitted area B.

[0096] Figure 15(a) shows the state immediately after the recording operation is completed, where the trailing edge of the recording medium is located downstream at a distance of L1+L2 or more from the conveyance roller 51. Because the distance between the trailing edge of the recording medium and the conveyance roller 51 is L1+L2 or more, there is no concern that the recording medium will be re-nipped by the conveyance roller 51 even if it is conveyed upstream by L1 during the feed preparation operation. Therefore, as shown in Figure 15(b), immediately after the recording operation is completed, it is possible to convey the recording medium upstream in the conveyance direction by L1 for the feed preparation operation.

[0097] FIG. 16 is a perspective view of a portion of the transport unit, illustrating the operation when the recording medium is positioned directly below the recording unit. After the recording operation is completed, the recording head 71 inside the recording unit 7 may be positioned directly above the recording medium, as shown in FIG. 16(a). Immediately after the recording operation is completed, the recording medium may curl, causing the edges to lift due to the influence of ink or other factors. Furthermore, once the trailing edge of the recording medium leaves the transport rollers 51, the recording medium is supported only by the discharge rollers 53, raising the risk of the trailing edge of the recording medium lifting. If the recording medium is transported upstream in this state, the curled edge may come into contact with the recording head 71, potentially causing ink stains or paper jams. Therefore, as shown in FIG. 16(b), the recording head 71 is moved in the direction of the arrow to retract from directly above the recording medium, and then a feeding preparation operation is performed. This prevents ink stains and paper jams.

[0098] The present disclosure can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0099] [Technical Features of the Present Disclosure] The present disclosure includes the following configurations.

[0100] (Configuration 1) A recording device comprising: a transport path through which a recording medium passes from upstream to downstream in a transport direction; a transport means disposed on the transport path and transporting the recording medium; a detection means for detecting an end of the recording medium in the transport path; and a control means for executing a first control for transporting the recording medium to the upstream side by the transport means and a second control for transporting the recording medium to the downstream side by the transport means, wherein the control means executes the first control or the second control based on the position of the rear end of the recording medium after the rear end of the recording medium is detected by the detection means.

[0101] (Configuration 2) The recording device according to Configuration 1, wherein the control means executes the first control when the trailing end is located in a predetermined first area on the transport path, and executes the second control when the trailing end is located in a predetermined second area on the transport path.

[0102] (Configuration 3) A recording device according to configuration 1 or 2, characterized in that the first area is an area that allows the recording medium to be transported upstream, and the second area is an area that does not allow the recording medium to be transported upstream.

[0103] (Configuration 4) The recording device according to any one of configurations 1 to 3, characterized in that the transport path is divided into a plurality of areas at different positions in the transport direction, and each of the plurality of areas is designated as either the first area or the second area.

[0104] (Configuration 5) The recording device according to any one of configurations 1 to 4, wherein the most downstream area of ​​the plurality of areas is designated as the first area.

[0105] (Configuration 6) A recording device according to any one of configurations 1 to 5, characterized in that a plurality of areas each having a different position in the transport direction are designated as the first area, and a plurality of areas each having a different position in the transport direction are designated as the second area.

[0106] (Configuration 7) A recording device according to any one of configurations 1 to 6, further comprising a feeding means for feeding a recording medium, a discharge means for discharging the recording medium transported by the transport means, and a drive means for driving the feeding means and the transport means, wherein the transport path has the feeding means side as the upstream side and the discharge means side as the downstream side.

[0107] (Configuration 8) A recording device described in any one of configurations 1 to 7, characterized in that the feeding means includes a feeding roller that can rotate in a first direction when transporting from upstream to downstream of the transport path, the transport means includes a transport roller that can rotate in the first direction or a second direction opposite to the first direction, and in a feeding preparation operation, the transport roller is driven to rotate a predetermined amount in the second direction.

[0108] (Configuration 9) The recording apparatus according to any one of configurations 1 to 8, wherein the second area is designated downstream of the transport roller.

[0109] (Configuration 10) A recording device described in any one of configurations 1 to 9, characterized in that in a feeding / discharging operation that simultaneously performs both an ejection operation of a preceding first recording medium remaining in the conveying path and a feeding operation of a subsequent second recording medium from the feeding means to the conveying means, when the trailing end of the first recording medium is in the first area, the control means performs the feeding preparation operation without rotating the conveying roller in the first direction, and when the trailing end of the first recording medium is in the second area, the control means rotates the conveying roller in the first direction until the trailing end of the first recording medium reaches the first area, and then performs the feeding preparation operation.

[0110] (Configuration 11) A recording device according to any one of configurations 1 to 10, further comprising a recording means having a recording head that moves back and forth in a direction perpendicular to the transport direction of the recording medium, and when the rear end of the recording medium is located inside the recording means, the control means retracts the recording head from above the recording medium and then executes the feeding preparation operation.

[0111] (Configuration 12) A recording device described in any one of configurations 1 to 11, characterized in that after the trailing end of the recording medium is detected by the detection means, the control means calculates the position of the trailing end of the recording medium based on the position of the detection means in the transport direction and the drive amount of the drive means from the time of detection to the completion of recording.

[0112] (Configuration 13) A recording device according to any one of configurations 1 to 12, characterized in that, during the feeding and discharging operation, the position of the rear end of the recording medium is calculated based on length information of the recording medium and the driving amount of the driving means from the time when the recording medium on which recording has been completed is fed until the time when recording is completed.

[0113] (Configuration 14) The recording device according to any one of configurations 1 to 13, wherein the length information is acquired when recording is performed on the first recording medium and stored in a memory unit.

[0114] (Configuration 15) A control method for a recording device comprising: a transport path through which a recording medium passes from upstream to downstream in a transport direction; a transport means disposed on the transport path and transporting the recording medium; a detection means for detecting an end of the recording medium in the transport path; and a control means for executing a first control to transport the recording medium to the upstream side by the transport means and a second control to transport the recording medium to the downstream side by the transport means, wherein the control method comprises a step in which the control means executes the first control or the second control based on the position of the rear end of the recording medium after the rear end of the recording medium is detected by the detection means.

[0115] (Configuration 16) A program for causing a computer to execute the method described in Configuration 15. [Explanation of symbols]

[0116] 1. Recording device 2 Feeding section 21 Loading section 22 Feeding roller 24 Pressure Plate 27 Separation roller 31 Control Gear 32 Release cam 33 Input gear 51 Conveyor roller 53 Discharge roller 6 Drive motor 7 Recording section 8 Discharge section

Claims

1. a feeding roller for feeding the recording medium; a conveying path through which the recording medium fed by the feeding roller passes from upstream to downstream in a conveying direction; a conveying roller disposed in the conveying path and rotating in a first direction to convey the recording medium downstream and a second direction to convey the recording medium upstream; a control unit that executes a first control for conveying the recording medium upstream by the conveying roller and a second control for conveying the recording medium downstream by the conveying roller; A recording device comprising: the conveying path has a first region and a second region that is different from the first region and includes at least a region near the conveying roller; When the feeding roller feeds a second recording medium following the first recording medium, the control unit executes the first control when the trailing edge of the first recording medium is located in the first region, executes the second control when the trailing edge is located in the second region, and after the trailing edge reaches the first region, rotates the conveying roller in the second direction to convey the first recording medium upstream. A recording device characterized by:

2. the control unit includes a detection unit that detects an end of the recording medium in the transport path, and after the detection unit detects the rear end of the first recording medium, the control unit executes the first control or the second control based on the position of the rear end of the first recording medium.

2. The recording apparatus according to claim 1, wherein the recording apparatus is a recording medium.

3. the second area is an area in which the recording medium is not permitted to be conveyed upstream; 2. The recording apparatus according to claim 1, wherein the recording apparatus is a recording medium.

4. the second region further includes a vicinity of the feed roller; 2. The recording apparatus according to claim 1, wherein the recording apparatus is a recording medium.

5. As the first control, the conveying roller is rotationally driven by a predetermined rotation amount in the second direction.

2. The recording apparatus according to claim 1, wherein the recording apparatus is a recording medium.

6. a discharge roller for discharging the recording medium conveyed by the conveyance roller; a driving means for driving the feeding roller and the conveying roller; Further comprising:

3. The recording apparatus according to claim 2.

7. the second area is designated on the downstream side of the conveying roller; 7. The recording apparatus according to claim 6.

8. When the first recording medium is the first sheet, the control unit drives the conveyance roller to rotate in the second direction after the first sheet of the first recording medium is discharged.

8. The recording apparatus according to claim 7,

9. a feeding / discharging operation in which both an operation of discharging the first recording medium remaining in the conveying path and an operation of feeding the second recording medium from the feeding roller to the conveying roller are simultaneously performed, The control means When the rear end of the first recording medium is in the first region, the conveying roller is not rotated in the first direction but is rotated in the second direction under the first control; When the trailing edge of the first recording medium is in the second region, the second control involves driving the conveying roller to rotate in the first direction until the trailing edge of the first recording medium reaches the first region, and then driving the conveying roller to rotate in the second direction.

9. The recording apparatus according to claim 8.

10. The recording device further includes a recording head that reciprocates in a direction perpendicular to the conveying direction of the recording medium, When the rear end of the recording medium is located inside the recording means, the control means retracts the recording head from above the recording medium and then executes the first control.

10. The recording apparatus according to claim 9.

11. after the trailing edge of the recording medium is detected by the detection means, the control means calculates the position of the trailing edge of the recording medium based on the position of the detection means in the transport direction and the drive amount of the drive means from the time of the detection to the completion of recording; 10. The recording apparatus according to claim 9.

12. In the feeding and discharging operation, the position of the rear end of the recording medium is calculated based on length information of the recording medium and the driving amount of the driving means from the time when the recording medium is fed after recording is completed until the time when recording is completed.

10. The recording apparatus according to claim 9.

13. The length information is acquired when recording is performed on the first recording medium and stored in a storage unit.

13. The recording apparatus according to claim 12.

14. a feeding roller for feeding the recording medium; a conveying path through which the recording medium fed by the feeding roller passes from upstream to downstream in a conveying direction; a conveying roller disposed in the conveying path and rotating in a first direction to convey the recording medium downstream and a second direction to convey the recording medium upstream; a control unit that executes a first control for conveying the recording medium upstream by the conveying roller and a second control for conveying the recording medium downstream by the conveying roller; A control method for a recording device comprising: the conveying path has a first region and a second region that is different from the first region and includes at least a region near the conveying roller; When the second recording medium following the first recording medium is fed by the feeding roller, a step of the control means executing the first control when the rear end of the first recording medium is located in the first area; a step of the control means executing the second control when the trailing end is located in the second region; the control means drives the conveying roller to rotate in the second direction after the trailing edge reaches the first region, thereby conveying the first recording medium upstream; having A control method comprising:

15. the control unit includes a detection unit that detects an edge of the recording medium in the conveyance path, the control means having a step of executing the first control or the second control based on the position of the rear end of the first recording medium after the rear end of the first recording medium is detected by the detection means, 15. The control method according to claim 14.

16. the second area is an area in which the recording medium is not permitted to be conveyed upstream; 15. The control method according to claim 14.

17. the second region further includes a vicinity of the feed roller; 15. The control method according to claim 14.

18. As the first control, the conveying roller is rotationally driven by a predetermined rotation amount in the second direction.

15. The control method according to claim 14.

19. the recording device further includes a discharge roller that discharges the recording medium conveyed by the conveyance roller, and a drive unit that drives the feed roller and the conveyance roller; 15. The control method according to claim 14.

20. A program for causing a computer to execute the method according to claim 14.

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