CN202685561U - Inkjet recording apparatus - Google Patents

Abstract

To provide an inkjet recording device capable of reducing the number of parts and making the device compact. Including: first conveying path (65); recording part (24); first conveying roller pair (59); second conveying roller pair (64); second conveying path (67); sheet sensor (72); sheet (49); the third conveying roller pair (44); interlocking mechanism (112); and rotary encoder (97), wherein, the first conveying roller pair (59) and the third conveying roller pair (44) The first path length (L2) from the nipping point of the first conveying roller pair to the nipping point of the third conveying roller pair is arranged to be shorter than the length of the smallest size sheet that can be fed from the tray (20).

Description

inkjet recording device

technical field

The utility model relates to an inkjet recording device capable of recording images on sheets.

Background technique

There is known an inkjet recording apparatus capable of recording an image on a sheet. In this inkjet recording apparatus, since the ink adhering to the recording surface of the sheet is not dried immediately after recording, the pressing force of the roller in contact with the recording surface is set to be small. Therefore, when the sheet is conveyed only by the roller pair on the downstream side of the recording unit, poor conveyance of the sheet may occur. In order to detect this conveyance failure, a sheet sensor is provided on the downstream side of the recording unit.

In this inkjet recording apparatus, since the sheet sensor is provided on the downstream side of the recording section, the number of parts increases. Also, a space for installing the sheet sensor must be secured.

Utility model content

Therefore, the present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide an inkjet recording device capable of reducing the number of components and making the device compact.

An inkjet recording device (10) according to one aspect of the present invention is characterized in that it includes: a first conveying path (65) having a mechanism for guiding the sheet from the tray (20) containing the sheet to the first conveying direction; a curved curved path (65A) and a horizontal straight path (65B) from the curved path (65A) to the sheet discharge port (78) on the downstream side of the first conveying direction; the recording unit (24), An image is recorded on a sheet in the linear path (65B); a first conveying roller pair (59) is provided on the upstream side of the recording section (24) in the first conveying direction, and the first conveying path The sheet in (65) is conveyed in the first conveying direction; the second conveying roller pair (64) is arranged on the downstream side of the recording unit (24) in the first conveying direction, and the sheet is further A spur gear (63) and a drive roller (62) that are conveyed in the first conveying direction are formed; a second conveying path (67) is downstream of the first conveying direction than the second conveying roller pair (64) The branch port (36) provided on the side branches from the first conveying path (65) and extends to a confluence port provided on the upstream side of the first conveying direction from the first conveying roller pair (59). (37) Merging with the first conveyance path (65), and conveying the sheet to the second conveyance path from the branch port (36) through the lower side of the recording unit (24) toward the merge port (37) Direction guidance; a sheet sensor (72), arranged between the confluence port (37) and the first pair of conveying rollers (59) in the first conveying path (65), detects whether a sheet passes through The first conveying path (65); the flap (49), from the fulcrum (87) provided on the upstream side of the first conveying direction of the branch port (36) to the downstream side of the first conveying direction Extended, supported in a first position above the branch port (36) (a position shown in dotted lines in Figure 2) and at least the extension end enters the second conveying path from the branch port (36) ( 67) of the second posture (the posture shown by the solid line in Fig. 2) can be freely rotated around the fulcrum (87); ) on the downstream side of the first conveying direction, conveying the sheet in the first conveying direction during single-sided recording, and turning the sheet back through the branch port (36) through the first conveying direction during double-sided recording. The second transmission path (67) transmits to the second transmission direction; the linkage mechanism (112) sends the driving force of the driving source to the first transmission roller pair (59) and the second transmission roller pair (64) respectively. ) and the third conveying roller pair (44) so that the first conveying roller pair (59), the second conveying roller pair (64) and the third conveying roller pair (44) are linked respectively and a rotary encoder (97), arranged in the first pair of conveying rollers (59), the second pair of conveying rollers (64), the third pair of conveying rollers (44) and the driving source Either one, measuring the first transmission path (65) and the second transmission path The conveying amount of the sheet in (67), wherein the first pair of conveying rollers (59) and the third pair of conveying rollers (44) are The first path length (L2) to the nip point of the third conveying roller pair (44) is arranged to be shorter than the length of a minimum size sheet that can be fed from the tray (20).

In addition, it is preferable that the sheet sensor (72) has a second path length ( L3) is arranged so as to be shorter than the minimum sheet length that can be supplied from the tray (20).

In addition, it is preferable that the inkjet recording apparatus further includes a support member (134) that supports the lower side guide members (61, 42, 62, 83, 45) of the linear path (65B) so as to be able to Move between the third posture (the posture of FIG. 3A ) and the fourth posture (the posture of FIG. 3B ) that moves downwards from the third posture (the posture of FIG. 3A ), during feeding from the tray (20) When recording the sheet, the supporting member (134) holds the lower guide members (61, 42, 62, 83, 45) in the third posture (the posture in FIG. The support member (134) guides the lower side guide member (61) when the sheet discharge port (78) records on the disk medium placed on the disk tray (53) inserted into the linear path (65B). , 42, 62, 83, 45) remain in the fourth posture (the posture of FIG. 3B ).

In addition, it is preferable that the curved path (65A) is formed in an arc shape so that the direction when the sheet is conveyed on the straight path (65B) is opposite to the direction when the sheet is fed from the tray (20).

In addition, it is preferable that the inkjet recording device according to the present invention further includes a supply mechanism (15), and the supply mechanism (15) has a An arm (26) rotatable around a fulcrum (28), and a supply roller (25) rotatably supported by the front end side of the arm (26), and the supply roller (25) is connected to the tray (20) The maintained sheets are rotated in contact with each other, whereby sheets are supplied from the tray (20) to the first transport path (65), and the first path length (L2) is the same as that from the supply roller and A third path length (L1) from a contact point of the sheet to a nip point of the first transport roller pair (59) is equal to or shorter than the third path length (L1).

In addition, it is preferable that the third transport roller pair (44) is a roller that discharges a sheet.

Another aspect of the inkjet recording device (10) according to the present invention is characterized in that it includes: a first conveying path (65) with a function of guiding the sheet from the tray (20) containing the sheet to the first conveying direction; A curved curved path (65A) and a horizontal straight path (65B) from the curved path (65A) to the sheet discharge port (78) on the downstream side of the first conveying direction; the recording unit (24), An image is recorded on a sheet in the linear path (65B); a first transport roller pair (59) is provided on the upstream side of the first transport direction from the recording section (24), and transports the first transport The sheet in the path (65) is conveyed in the first conveying direction; the second conveying roller pair (64) is arranged on the downstream side of the recording unit (24) in the first conveying direction, and the sheet is A spur gear (63) and a driving roller (62) that are further conveyed in the first conveying direction are formed; a sheet sensor (72) is arranged on the first conveying roller pair in the first conveying path (65) On the upstream side of (59), it is detected whether there is a sheet passing through the first conveying path (65); the third conveying roller pair (44) is arranged closer to the first conveying roller pair than the second conveying roller pair (64). On the downstream side of the conveying direction, the sheet is conveyed in the first conveying direction; the interlocking mechanism (112) sends the driving force of the driving source to the first conveying roller pair (59) and the second conveying roller pair respectively. (64) and the third conveying roller pair (44) transfer so that the first conveying roller pair (59), the second conveying roller pair (64) and the third conveying roller pair (44) respectively interlocking; and a rotary encoder (97), arranged on the first pair of conveying rollers (59), the second pair of conveying rollers (64), the third pair of conveying rollers (44) and the driving source Either one of them, measuring the conveying amount of the sheet in the first conveying path (65), wherein the first conveying roller pair (59) and the third conveying roller pair (44) are The first path length (L2) from the pinch point of the first conveyor roller pair (59) to the pinch point of the third conveyor roller pair (44) is longer than the smallest size that can be supplied from the tray (20). The sheets are arranged so that the length of the sheet is short.

In addition, it is preferable that the inkjet recording device further includes: a second conveying path (67), and the branch port (36) provided on the downstream side of the first conveying direction of the second conveying roller pair (64) passes through the The first conveying path (65) branches and extends to the junction (37) provided on the upstream side of the first conveying roller pair (59) in the first conveying direction and the first conveying path (65) Merge, guide the sheet to the second conveying direction from the branch port (36) through the lower side of the recording unit (24) toward the merge port (37); and a flap (49), from the The supporting shaft (87) provided on the upstream side of the first conveying direction of the branch port (36) extends toward the downstream side of the first conveying direction and is supported on the first branch port (36) above the branch port (36). Between the posture (the posture shown by the dotted line in Fig. 2 ) and the second posture (the posture shown by the solid line among Fig. It can freely rotate around the support shaft (87).

In addition, it is preferable that the rotary encoder (97) is installed on the first conveying roller pair (59) to measure conveyance of the sheet in the first conveying path (65) and the second conveying path (67). quantity.

In addition, it is preferable that the minimum size sheet length that can be fed by the tray (20) is a photo L size.

Description of drawings

1A and 1B are perspective views of a multifunction peripheral 10 as an example of an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view schematically showing the internal structure of the printing unit 11 .

3A and 3B are diagrams schematically showing the structure of the cam driving mechanism 134 .

FIG. 4 is a block diagram for explaining the outline of the drive system of the conveyance motor 110 .

FIG. 5 is a schematic diagram for explaining the arrangement relationship of each conveying roller pair.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The embodiment described below is merely an example of the present invention, and the embodiment of the present invention can be appropriately changed within a range not changing the gist of the present invention. In the following description, the up-down direction 7 is defined based on the state where the multifunction peripheral 10 is set up for use (the state in FIGS. 1A and 1B ), and the front-rear direction is defined with the side where the opening 13 is provided as the near side (front side). 8. A left-right direction 9 is defined by viewing the multifunction peripheral 10 from the near side (front side).

[summary of multifunction machine 10]

As shown in FIGS. 1A and 1B , the multifunction peripheral 10 is formed roughly in a thin rectangular parallelepiped, and an inkjet printing system printing unit 11 is provided at the lower portion. The multifunction peripheral 10 has various functions such as a facsimile function and a printing function. In addition, the presence or absence of functions other than the printing function is optional. Therefore, in this embodiment, descriptions of functions other than the printing function and components that realize the functions are omitted.

[Structure of Printing Section 11]

As shown in FIG. 2 , the printing unit 11 mainly includes a tray 20 (an example of a tray) capable of holding recording paper (an example of a sheet) of various sizes; a supply unit 15 (an example of a supply mechanism) that picks up and supplies recording paper from the tray 20 One example); the recording unit 24 (an example of the recording unit) of the inkjet recording method for performing image recording using ink.

The printing unit 11 has a case 14 (see FIGS. 1A and 1B ) having an opening 13 (see FIGS. 1A and 1B ) formed on the front, and the tray 20 is provided so as to be insertable and detachable from the opening 13 in the front-rear direction 8 . That is, the tray 20 can be attached to and removed from the housing 14 .

A tray guide 51 is provided above the tray 20 . The tray guide 51 is slidably supported by the casing 14, and can be pulled out forward from the state housed inside as shown in FIG. 1A to the state protruding from the front as shown in FIG. 1B. A disk tray 53 (refer to FIG. 1B , an example of a disk tray) is supported by the upper surface of the tray guide 51 so as to be insertable and detachable in the forward-backward direction 8 . The disk tray 53 is a flat member with a thickness of about 3 mm capable of holding disk media such as CDs and DVDs. When the disk tray 53 is inserted into the tray guide 51 with the disk medium held in the disk tray 53 , the disk medium is placed at a position where recording is possible by the recording unit 24 . When the tray guide 51 is pulled out, the cam driving mechanism 134 described later operates, and the linear path 65B (an example of the linear path) described later expands downward, whereby the disk tray 53 can be inserted into the linear path 65B. .

The control of the printing unit 11 is performed by the control unit 100 (see FIG. 4 ). The control unit 100 drives the printing unit 11 based on a signal or data input from an external device, and records an image on a recording medium. In the present embodiment, the control unit 100 has a normal recording mode in which the recording paper stored in the tray 20 is transported to the recording unit 24 to record an image on the recording paper, and a disk placed on the disk tray 53 inserted through the opening 13 is provided. There is a label recording mode for recording an image on the label side of a sheet medium, and recording control corresponding to any one of the recording modes is performed.

[Supply part 15]

As shown in FIG. 2 , the supply unit 15 is provided above the tray 20 and below the recording unit 24 . The supply unit 15 includes a paper feed roller 25 (an example of a supply roller), a paper feed arm 26 (an example of an arm), and a drive transmission mechanism 27 in which a plurality of gears mesh. The support shaft 28 is provided between the tray 20 and the reverse conveyance path 67 (an example of the second conveyance path) to be described later. One end of the paper feed arm 26 is pivotally supported by a support shaft 28 , whereby the paper feed arm 26 is rotatable in the direction of the arrow 29 about the support shaft 28 . The paper feed arm 26 extends obliquely downward from the support shaft 28 , and pivotally supports the paper feed roller 25 at the front end portion of the paper feed arm 26 so as to be rotatable. As a result, the paper feed roller 25 can come into contact with the recording paper placed on the tray 20 and can also be separated from the tray 20 . The paper feed roller 25 is rotated by transmitting a driving force of a paper feed motor (not shown) through a drive transmission mechanism 27 . The paper feed roller 25 rotates in contact with the uppermost recording paper among the recording papers stacked on the tray 20, and separates the recording paper from other recording papers located below it to move toward a curved path 65A described later. (An example of a curved path) supply.

[Teleportation Path 65]

Inside the printing unit 11 is formed a transport path 65 (an example of a first transport path) from the front end (rear end) of the tray 20 to the ejected paper holding portion 79 via the recording unit 24 . The conveyance path 65 is divided into a curved path 65A formed from the front end of the tray 20 to the recording unit 24 and a straight path 65B formed from the recording unit 24 to the discharged sheet holding unit 79 .

The curved path 65A is a curved path extending from the vicinity of the upper end of the separation inclined plate 22 provided on the tray 20 to the recording unit 24 . The curved path 65A is substantially formed in an arc shape centered on the inner side of the printing unit 11 . The recording paper supplied from the tray 20 moves along the conveying direction (the direction shown by the single-dot chain line in FIG. 2 ) to the first conveyance direction (the direction of the arrow marked on the single-dot chain line in FIG. 1 An example of the transport direction) is bent and guided directly below the recording unit 24. That is, the curved path 65A is curved such that the direction when the recording paper is conveyed directly below the recording unit 24 is opposite to the direction when the recording paper is fed from the tray 20 . The curved path 65A is divided by the outer guide member 18 and the inner guide member 19 opposed to each other with a predetermined interval therebetween. In addition, the outer guide member 18, the inner guide member 19, and the guide members 83, 31, and 32 described later all extend in a direction perpendicular to the paper surface in FIG. 2 (left-right direction 9 in FIGS. 1A and 1B ).

The straight path 65B is a straight, substantially horizontal passage extending from directly below the recording unit 24 to the paper discharge holding unit 79 . This linear path 65B passes not only the recording paper from the tray 20 but also the disk tray 53 (see FIGS. 1A and 1B ) inserted through the opening 13 . The recording paper or disc tray 53 is guided along the straight path 65B. The linear path 65B is formed by the recording unit 24 and the platen 42 facing each other with a predetermined interval at the position where the recording unit 24 is provided, and the guide members 83 facing each other with a predetermined interval at the position where the recording unit 24 is not provided. divided.

In this embodiment, the spur gear 61 , the platen 42 , the second drive roller 62 , the linear guide member 83 , and the third drive roller 45 are arranged in order toward the first conveyance direction as members responsible for guiding the lower side of the linear path 65B. Each of these members is an example of a lower guide member, and the lower guide that forms the linear path 65B is divided by these members. The linear guide member 83 is a plate-shaped resin member disposed between the second drive roller 62 and the branch port 36 described later. The linear guide member 83 has a concave portion 84 . The recess 84 forms an opening on the upper surface of the linear guide member 83 , that is, the lower guide surface of the linear path 65B. The concave portion 84 is a groove extending in the front-rear direction 8 . The concave portion 84 may also be formed so as to extend downstream in the first transport direction to reach the downstream end of the linear guide member 83 . In this case, the downstream side of the concave portion 84 communicates with the branch port 36 . The size and position of the recessed portion 84 are designed so that the first auxiliary roller 47 described later can advance and retreat toward the recessed portion 84 . The concave portion 84 is not a single groove, but a plurality of grooves are arranged side by side in the left-right direction 9 according to the number of the first auxiliary rollers 47, and is formed in a comb shape. The other members serving as the lower side guide will be described later.

In addition, in this embodiment, the first drive roller 60 , the recording unit 24 , the spur gear 63 , the flap 49 , and the spur gear 46 are arranged in this order toward the first conveyance direction as members responsible for guiding the upper side of the linear path 65B. The upper side guides forming the linear path 65B are divided by these respective members. Other members responsible for the upper side guide will be described later.

A branch port 36 (an example of a branch port) is provided in the linear path 65B. During double-sided image recording, the recording paper conveyed on the straight path 65B is diverted downstream of the branch port 36 in the first conveyance direction, and conveyed toward a reverse conveyance path 67 described later.

[recording section 24]

The recording unit 24 performs image recording on the recording paper supplied from the tray 20 or on the disc medium inserted into the disc tray 48 in the linear path 65B by the inkjet recording method. The recording unit 24 is arranged above the tray 20 . The recording unit 24 reciprocates in the left-right direction 9 (direction perpendicular to the paper surface in FIG. 2 ). A platen 42 for holding recording paper horizontally is provided below the recording unit 24 . During the reciprocating movement of the recording unit 24 in the horizontal direction 9 , ink supplied from an ink cartridge (not shown) is ejected from the nozzles 39 onto the recording paper conveyed on the platen 42 . Thus, an image is recorded on the recording paper on the transport path 65 .

[Conveying roller pair 59, discharge roller pair 64, return roller pair 44]

As shown in FIG. 2 , on the upstream side of the recording unit 24 in the first transport direction, specifically, between the downstream ends of the outer guide member 18 and the inner guide member 19 in the first transport direction and the recording unit 24, a The conveying roller pair 59 (an example of the first conveying roller pair) constituted by the first driving roller 60 and the pinch roller 61 . The pinch roller 61 is arranged below the first driving roller 60 and is brought into pressure contact with the roller surface of the first driving roller 60 via an elastic member such as a spring (not shown). The conveying roller pair 59 nips the recording paper conveyed along the curved path 65A and conveys it onto the platen 42 .

As shown in FIG. 5 , the transport roller pair 59 is arranged at a position P2 separated by a predetermined distance along the transport path from the contact point P1 of the paper feed roller 25 with the recording paper. Specifically, the nip point of the transport roller pair 59 is arranged so as to coincide with the position P2. No mechanism for conveying recording paper is provided between the paper feed roller 25 and the pair of conveying rollers 59 . Therefore, the recording paper that can be supplied from the tray 20 in the printing section 11 is limited to a length in the transport path direction (length in the longitudinal direction) that is longer than the path length L1 along the transport path from the position P1 to the position P2 (the third path length). One example) long recording paper. In this embodiment, the recording paper of the minimum size that can be supplied from the tray 20 in the printing unit 11 is used as the recording paper of the photo L size (89 mm×127 mm). In this case, the above-mentioned path length L1 is designed to be shorter than 127 mm so that the recording paper of the photo L size can be supplied from the tray 20 . Assuming that the margin required for the pair of conveying rollers 59 to clamp the recording paper is α, the above-mentioned path length L1 is designed to be (127-α) mm.

As shown in FIG. 4 , a rotary encoder 97 (an example of a rotary encoder) is attached to the rotation shaft of the first drive roller 60 . The rotary encoder 97 outputs a pulse signal according to the amount of rotational displacement of the shaft, and is an integral encoder having an encoder disk or an optical sensor built therein. The control unit 100 can detect the amount of rotation of the first drive roller 60 by counting the number of pulses of the pulse signal from the rotary encoder 97 , and can calculate the conveyance amount of the recording paper based on the amount of rotation. For example, the control unit 100 can accurately determine the transport position of the recording paper on the respective transport paths 65 and 67 by detecting the transport amount after the front end of the recording paper and the path length from the rotor 74 by the detection mechanism 72 described later. In this embodiment, the rotary encoder 97 is attached to the rotation shaft of the first driving roller 60, but it may be installed on the second driving roller 62 or the third driving roller 45, or may be installed on the transmission motor 110 (refer to FIG. 4) The axis of rotation.

On the downstream side of the recording unit 24 in the first conveying direction, in detail, between the recording unit 24 and the linear guide member 83, a pair of discharge rollers 64 (second conveying roller pair 64) composed of a second drive roller 62 and a spur gear 63 is provided. An example of a roller pair). A spur gear 63 is provided above the second drive roller 62 . The spur gear 63 is brought into pressure contact with the roller surface of the second drive roller 62 via an elastic member such as a spring (not shown). The pair of discharge rollers 64 sandwiches the recording paper on which an image has been recorded by the recording unit 24 and conveys it further downstream in the first conveying direction. Therefore, the pressing force (clamping force) of the pair of discharge rollers 64 is set to be much smaller than the pressing force of the pair of conveying rollers 59 .

The respective drive rollers 60 and 62 are rotated by transmitting a rotational driving force from the conveyance motor 110 (see FIG. 4 ) via a drive transmission mechanism 112 (an example of an interlocking mechanism). The drive transmission mechanism 112 is composed of planetary gears and the like, and transmits the rotational driving force of the transmission motor 110 to all the drive rollers 60, 62 regardless of which direction the transmission motor 110 rotates in the forward rotation or the reverse direction, so that each of the drive rollers 60, 62 is driven. The rollers 60, 62 rotate in one rotational direction. As a result, the recording paper is transported in the first transport direction.

On the downstream side of the branch opening 36 in the first conveyance direction, there is provided a return roller pair 44 composed of a third drive roller 45 and a spur gear 46 (an example of the third conveyance roller pair, hereinafter referred to as "SB roller pair 44") . The spur gear 46 is disposed above the third driving roller 45 and is brought into pressure contact with the roller surface of the third driving roller 45 via an elastic member such as a spring not shown.

As shown in FIG. 5 , the pair of SB rollers 44 is arranged at a position P3 separated from a position P2 of the pair of transport rollers 59 along the transport path by a predetermined distance. Specifically, it is arranged so that the nip point of the SB roller pair 44 coincides with the position P3. A discharge roller pair 64 is provided between the conveying roller pair 59 and the SB roller pair 44 as a mechanism for conveying the recording paper. However, the pressing force of the discharge roller pair 64 is extremely small. Therefore, in the present embodiment, the pair of SB rollers 44 is arranged at the position P3 where the leading end of the photo L-size recording paper can reach the pair of SB rollers 44 only by the pair of transport rollers 59 . Specifically, the SB is arranged such that the path length L2 (an example of the first path length) along the conveyance path from the position P2 to the position P3 is shorter than the length (127 mm) in the conveyance path direction of the photo L-size recording paper. Conveying roller pair 44 . In this embodiment, the above-mentioned path length L2 is designed to be equal to or shorter than the above-mentioned path length L1 (=127-α). If it is the roller arrangement structure of the conventional device, since a photosensor, a rotating member, etc. are provided in the section from the discharge roller pair 64 to the SB roller pair 44, it is impossible to transport the recording paper with the path length L2 larger than the photo L plate size. The length (127mm) in the path direction is short, but in this embodiment, since no optical sensor, rotating member, etc. are installed in this section, the arrangement position of the SB roller pair can be close to the conveying roller pair 59 side by the amount of the installation space. .

The third driving roller 45 is driven to rotate in the forward rotation direction or the reverse rotation direction by transmitting a rotational driving force in the forward rotation direction from the transport motor 100 via the drive transmission mechanism 112 . For example, when single-sided recording is performed, the third driving roller 45 rotates in the forward rotation direction. As a result, the recording paper is nipped by the SB roller pair 44 and discharged from the discharge port 78 (an example of a sheet discharge port) on the downstream side to the paper discharge holding portion 79 . On the other hand, when double-sided recording is performed, the rotation direction of the third drive roller 45 is switched from the normal rotation direction to the reverse rotation direction with the SB roller pair 44 nipping the rear end of the recording paper. The recording paper is transported toward the reverse transport path 67 after the rear end of the recording paper is directed to the reverse transport path 67 described later by the path switching unit 41 described below and the rotation direction of the third driving roller 45 is switched to the reverse direction. .

[Detection mechanism 72]

On the upstream side of the conveying roller pair 59 in the first conveying direction, specifically, between the junction 37 (an example of a junction) and the conveying roller pair 59 on the upstream side of the conveying roller pair 59 in the first conveying direction A detection mechanism 72 (an example of a sheet sensor) is provided. The detection mechanism 72 detects the presence or absence of recording paper in the transport path 65 transported toward the recording unit 24 , or detects the front end position and the rear end position of the recording paper on the transport path 65 . As shown in FIG. 2 , the detection mechanism 72 has a transmissive optical sensor 73 composed of a light emitting element and a light receiving element, and an arm-shaped rotator 74 protruding so as to cross the transport path 65 . Rotary member 74 is supported so as to be able to swing around rotation shaft 75 , and is held in a posture crossing conveyance path 65 by a torsion coil spring or the like when there is no recording paper on conveyance path 65 . The rotating body 74 is provided with a detection element 76 that advances and retreats toward the detection portion of the optical sensor 73 . When the recording paper is transported to the transport path 65 and the rotating member 74 is rotated, the detecting member 76 exits from the detecting portion, and when the recording paper passes through the rotating member 74, the detecting member 76 enters the detecting portion again. Based on the change in the signal from the optical sensor 73 at this time, the control unit 100 detects the position of the recording paper on the transport path 65 .

[path switching unit 41]

As shown in FIG. 2 , the path switching unit 41 is disposed on the downstream side of the discharge roller pair 64 in the first conveyance direction and on the upstream side of the SB roller pair 44 in the first conveyance direction. The path switching unit 41 is composed of a first auxiliary roller 47 , a second auxiliary roller 48 , a flap 49 (an example of a flap), and a support shaft 87 .

A support shaft 87 extending in the direction perpendicular to the paper surface of FIG. 2 (the left-right direction 9 in FIGS. 1A and 1B ) is provided on the frame or the like of the printing unit 11 . The flap 49 extends substantially downstream in the first conveying direction from the support shaft 87 and is rotatably supported by the support shaft 87 . A first auxiliary roller 47 and a second auxiliary roller 48 are pivotally supported on the flap 49 . Since the roller surfaces of the auxiliary rollers 47 and 48 are in contact with the recording surface of the recording paper, the spur gear 63 and the spur gear 46 are similarly formed in a spur gear shape. The first auxiliary roller 47 is provided on the base end side (rear side) of the flap 49 , and the second auxiliary roller 48 is provided on the extended end side (front side) of the flap 49 .

The flap 49 is configured so that its posture can be changed, and it is in the discharge posture (the posture shown by the dotted line in FIG. The roller 48 rotates between the reverse postures (the posture shown by the solid line in FIG. 2 , an example of the second posture) that enters downward from the branch port 36 . In the state where no external force is applied to the flap 49, the extended end side hangs down due to its own weight. Therefore, the flap 49 always maintains the inverted posture. When the flap 49 is in the inverted posture, the first auxiliary roller 47 enters the recess 84 . On the other hand, when the flap 49 is in the ejection posture, the first auxiliary roller 47 withdraws from the recess 84 . The flap 49 can also be elastically biased into a reverse posture by an elastic member such as a spring.

[Reverse Teleport Path 67]

As shown in FIG. 2 , a reverse conveyance path 67 is formed between the recording unit 24 and the tray 20 . The reverse conveyance path 67 branches off from the straight path 65B at the branch port 36 , passes through the lower side of the recording unit 24 and the upper side of the paper feed arm 27 , and is at the junction 37 on the upstream side of the conveyance roller pair 59 in the first conveyance direction. It merges with the curved path 65A. The recording paper is conveyed toward the second conveyance direction on the reverse conveyance path 67 . Here, the second conveying direction is a direction in which the reversed conveying path 67 goes from the branch port 36 to the converging direction 37 , and refers to the direction indicated by the dashed-two dotted lines with arrows in FIG. 2 .

The upper side of the reverse conveyance path 67 is divided by the second guide member 32 formed in a substantially thin flat rectangular shape. Furthermore, the lower side of the reverse conveyance path 67 is divided by the first guide member 31 formed in a substantially thin flat rectangular shape. In detail, the reverse conveyance path 67 is defined by the lower surface of the second guide member 32 and the upper surface of the first guide member 31 . That is, the second guide member 32 and the first guide member 31 are disposed facing each other with a predetermined interval through which the recording paper can pass. Both ends of the second guide member 32 and the first guide member 31 are supported by the frame of the printing unit 11 or the like.

[transfer roller pair 70]

As shown in FIG. 2 , a conveying roller pair 70 composed of a fourth driving roller 68 and a driven roller 69 is provided on the reverse conveying path 67 . The driven roller 69 is disposed below the recording unit 24 and above the fourth drive roller 68 . The fourth drive roller 68 is in pressure contact with the roller surface of the driven roller 69 via a coil spring (not shown). The fourth drive roller 68 is driven to rotate in the forward rotation direction or the reverse rotation direction by transmitting the driving force in the forward rotation direction from the transport motor 110 . In the present embodiment, the transport roller pair 70 pinches the recording paper between the fourth drive roller 68 and the driven roller 69 when the transport motor rotates in the reverse direction, so that the recording paper is transported by the reverse transport path 67 . The incoming recording paper is conveyed in the second conveying direction.

[Cam driving mechanism 134]

As shown in FIGS. 3A and 3B , a cam drive mechanism 134 (an example of a supporting member) is provided in the printing unit 11 . The cam driving mechanism 134 is each member of the spur gear 61, the platen 42, the second driving roller 62, the linear guide member 83, and the third driving roller 45 (hereinafter collectively referred to as "lower side") that guide the lower side of the linear path 65B. Guide member ") is a third posture (the posture shown in the solid line in Fig. 2, the posture of Fig. 3A) and the fourth posture (the posture shown in the wavy line among Fig. A mechanism capable of moving between poses of Figure 3B). In the present embodiment, when the lower guide member is in the fourth posture, the linear path 65B expands to a width capable of transporting the disk tray 53 inserted from the opening 13 along the insertion direction 98 .

The cam driving mechanism 134 has a connecting plate 136 connected to the tray guide 51 (see FIGS. 1A and 1B ). Two connecting plates 136 are provided in pairs at intervals in the left-right direction 9 . The spur gear 61, the platen 42, the second drive roller 62, the linear guide member 83, and the third drive roller 45 are disposed between the connecting plates 136, and the respective ends of the lower guide members in the left-right direction 9 are formed on The groove-shaped sliding cam 137 on the connecting plate 136 supports it. 3A and 3B show the slide cam 137A supporting the spur gear 61, the slide cam 137B supporting the second driving roller 62, and the sliding cam 137C supporting the third driving roller 45, but the adjustment of the platen 42 and the linear guide member 83 is omitted. Supported slide cam. With this configuration, when the tray guide 51 is pulled forward in the third posture shown in FIG. 3A , the connecting plate 136 moves forward (to the right in FIGS. 3A and 3B ). As a result, the supported position of each supported portion of the lower guide member moves from the upper position of the slide cam to the lower position, and the lower guide member assumes the fourth posture (see FIG. 3B ). As a result, the straight path 65B expands downward. It goes without saying that a mechanism other than the cam drive mechanism 134 may be used as long as the linear path 65B is expanded.

[Function and effect of the embodiment]

As described above, in this embodiment, the transport roller pair is arranged such that the path length L2 along the transport path from the position P2 to the position P3 is shorter than the length (127 mm) in the transport path direction of the photo L-size recording paper. 59 and SB roller pair 44. Therefore, before the trailing end of the recording paper of the smallest size conveyed by the conveying roller pair 59 leaves the nip point of the conveying roller pair 59, the front end of the recording paper reaches the nip point of the SB roller pair 44 to be nipped by the SB roller pair 44. hold. Thereby, in the section from the pair of conveying rollers 59 to the pair of SB rollers 44 , the recording paper is reliably nipped and conveyed by both or either of the pair of conveying rollers 59 and the pair of SB rollers 44 . Moreover, after the trailing end of the recording paper falls off from the pair of conveying rollers 59, the recording paper is conveyed by both the pair of discharge rollers 64 and the pair of SB rollers 44. Even if the conveyance by the conveying rollers 59 is not carried out, the recording paper can be reliably conveyed to the second roller. A transmission direction is transmitted. Accordingly, it is possible to prevent the recording paper from jamming or conveying failure between the pair of conveying rollers 59 and the pair of SB rollers 44 .

[modified example]

In the above-mentioned embodiment, the structure in which the transport roller pair 59 and the SB roller pair 44 are arranged so that the path length L2 is shorter than the length (127 mm) in the transport path direction of the photo L-size recording paper is described. The path length L3 (an example of the second path length) along the transport path from the rotor 74 to the SB roller pair 44 is shorter than the transport path length (127 mm) of the photo L-size recording paper. In other words, the path length L3 from the detection position of the recording paper by the detection mechanism 74 (that is, the position where the rotating member 74 is provided) to the SB roller pair 44 may be longer than the length in the transport path direction of the recording paper of the photo L version size ( 127mm) short position on the configuration detection mechanism 74 or rotating member 74. According to this configuration, even if a failure occurs in the SB roller pair 44 and a transport failure such as slippage occurs, since the detection mechanism 72 is at a position capable of detecting the rear end of the recording paper of the smallest size, based on the detection time of the detection mechanism 72, etc., The control unit 100 can also reliably determine that a recording paper jam or conveyance failure has occurred.

Claims (12)

1. An inkjet recording device (10), characterized in that, Including: a first conveying path (65), having a curved curved path (65A) that guides sheets from a tray (20) containing sheets to a first conveying direction, and from the curved path (65A) to the a horizontal straight path (65B) of the sheet discharge port (78) on the downstream side of the first transport direction; a recording section (24) for recording an image on a sheet in the linear path (65B); The first conveying roller pair (59) is provided on the upstream side of the first conveying direction relative to the recording unit (24), and guides the sheet in the first conveying path (65) toward the first conveying direction. send; The second conveying roller pair (64) is arranged on the downstream side of the first conveying direction than the recording unit (24), and is driven by a spur gear (63) and a spur gear (63) that further convey the sheet in the first conveying direction. Roller (62) constitutes; The second transport path (67) is branched from the first transport path (65) at a branch port (36) provided on the downstream side of the second transport roller pair (64) in the first transport direction, and The confluence port (37) extending to the upstream side of the first conveying direction from the first conveying roller pair (59) merges with the first conveying path (65) to transfer the sheet from the The branch port (36) is guided through the underside of the recording part (24) towards the second conveying direction of the confluence port (37); A sheet sensor (72), arranged between the junction (37) and the first pair of conveying rollers (59) in the first conveying path (65), detects whether a sheet passes through the first A transmission path (65); A flap (49) extending from a fulcrum (87) provided on the upstream side of the first conveying direction of the branch port (36) to the downstream side of the first conveying direction is supported to be positioned at the branch port (36). The first posture above the mouth (36) and the second posture in which at least the extension end enters the second conveyance path (67) from the branch mouth (36) are freely rotatable about the pivot (87). ; The third conveying roller pair (44) is arranged on the downstream side of the first conveying direction than the branch port (36), and conveys the sheet to the first conveying direction when recording on one side, and conveys the sheet in the first conveying direction when recording on both sides. Turning the sheet back and conveying from the branch port (36) to the second conveying direction through the second conveying path (67); The linkage mechanism (112) transmits the driving force of the driving source to the first pair of conveying rollers (59), the second pair of conveying rollers (64) and the third pair of conveying rollers (44) respectively so that The first pair of conveying rollers (59), the second pair of conveying rollers (64) and the third pair of conveying rollers (44) are linked respectively; and A rotary encoder (97), arranged on any one of the first pair of conveying rollers (59), the second pair of conveying rollers (64), the third pair of conveying rollers (44) and the driving source , measuring the conveying amount of the sheet in the first conveying path (65) and the second conveying path (67), Wherein, the first pair of conveying rollers (59) and the third pair of conveying rollers (44) are arranged from the pinch point of the first pair of conveying rollers (59) to the third pair of conveying rollers (44) The first path length (L2) to the clamping point is arranged to be shorter than the length of the smallest size sheet that can be fed from the tray (20). 2. The inkjet recording apparatus according to claim 1, wherein, The sheet sensor (72) is compared to a second path length (L3) from a position where a sheet can be detected based on the sheet sensor (72) to a nip point of the third transport roller pair (44). The sheets of the minimum size that can be fed from the tray (20) are arranged so that the length of the sheet is short. 3. The inkjet recording apparatus according to claim 1, wherein, Also including a support member (134), The support member (134) supports the lower guide member (61, 42, 62, 83, 45) of the linear path (65B) in a third position and a second position capable of moving downward from the third position. Move between the four poses, The support member (134) holds the lower guide members (61, 42, 62, 83, 45) in the third position during recording on the sheet supplied from the tray (20). When recording on a disk medium mounted on a disk tray (53) inserted from the sheet discharge port (78) into the linear path (65B), the support member (134) holds the lower side The guide member (61, 42, 62, 83, 45) is maintained in said fourth posture. 4. The inkjet recording apparatus according to claim 1, wherein, The curved path (65A) is formed in an arc shape so that the direction when the sheet is conveyed on the straight path (65B) is opposite to the direction when the sheet is fed from the tray (20). 5. The inkjet recording apparatus according to claim 1, wherein, Also includes supply mechanism (15), The supply mechanism (15) has an arm (26) rotatable around a fulcrum (28) defined between the tray (20) and the second transport path (67), and ) is supported as a rotatable supply roller (25) on the front end side, and the supply roller (25) rotates in a state of contact with the sheet held by the tray (20). feeding the sheet to the first transport path (65), The first path length (L2) is the same as or less than the third path length (L1) from the contact point of the supply roller and the sheet to the nip point of the first transport roller pair (59). This third path length (L1) is short. 6. The inkjet recording apparatus according to claim 1, wherein, The rotary encoder (97) is installed on the first conveying roller pair (59), and measures the conveying amount of the sheet in the first conveying path (65) and the second conveying path (67). 7. The inkjet recording apparatus according to claim 1 or 2, wherein, The minimum sheet length that can be supplied by the tray (20) is a photo L size. 8. The inkjet recording apparatus according to claim 1, wherein, The third transport roller pair (44) is a roller that discharges a sheet. 9. An inkjet recording device (10), characterized in that, Including: a first conveying path (65), having a curved curved path (65A) that guides sheets from a tray (20) containing sheets to a first conveying direction, and from the curved path (65A) to the a horizontal straight path (65B) of the sheet discharge port (78) on the downstream side of the first transport direction; a recording section (24) for recording an image on a sheet in the linear path (65B); The first conveying roller pair (59) is provided on the upstream side of the first conveying direction relative to the recording unit (24), and guides the sheet in the first conveying path (65) toward the first conveying direction. send; The second conveying roller pair (64) is arranged on the downstream side of the first conveying direction than the recording unit (24), and is driven by a spur gear (63) and a spur gear (63) that further convey the sheet in the first conveying direction. Roller (62) constitutes; a sheet sensor (72), arranged on the upstream side of the first conveying roller pair (59) in the first conveying path (65), to detect whether a sheet passes through the first conveying path (65); The third conveying roller pair (44) is arranged on the downstream side of the first conveying direction than the second conveying roller pair (64), and conveys the sheet to the first conveying direction; The linkage mechanism (112) transmits the driving force of the driving source to the first pair of conveying rollers (59), the second pair of conveying rollers (64) and the third pair of conveying rollers (44) respectively so that The first pair of conveying rollers (59), the second pair of conveying rollers (64) and the third pair of conveying rollers (44) are linked respectively; and A rotary encoder (97), arranged on any one of the first pair of conveying rollers (59), the second pair of conveying rollers (64), the third pair of conveying rollers (44) and the driving source , measuring the transport amount of the sheet in the first transport path (65), Wherein, the first pair of conveying rollers (59) and the third pair of conveying rollers (44) are arranged from the pinch point of the first pair of conveying rollers (59) to the third pair of conveying rollers (44) The first path length (L2) to the clamping point is arranged to be shorter than the length of the smallest size sheet that can be fed from the tray (20). 10. The inkjet recording apparatus according to claim 9, further comprising: In the second transport path (67), the branch port (36) provided on the downstream side of the first transport direction of the second transport roller pair (64) is branched from the first transport path (65), and extends The confluence port (37) provided on the upstream side of the first conveying direction of the first conveying roller pair (59) merges with the first conveying path (65) to transfer the sheet from the branch port (36) guiding through the underside of the recording part (24) toward the second conveying direction of the junction (37); and A flap (49) extending from a fulcrum (87) provided on the upstream side of the first conveying direction of the branch port (36) to the downstream side of the first conveying direction is supported to be positioned at the branch port (36). The first posture above the mouth (36) and the second posture in which at least the extension end enters the second conveyance path (67) from the branch mouth (36) are freely rotatable about the pivot (87). . 11. The inkjet recording apparatus according to claim 9, wherein, The rotary encoder (97) is installed on the first conveying roller pair (59), and measures the conveying amount of the sheet in the first conveying path (65) and the second conveying path (67). 12. The inkjet recording apparatus according to claim 9, wherein, The minimum sheet length that can be supplied by the tray (20) is a photo L size. the

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