JP7410614B2 - printing device - Google Patents

Description

The present invention relates to a printing apparatus that includes a side guide that restricts movement of the side edge of a sheet.

The printing apparatus is provided with a feeding device that feeds a sheet placed on a pressure plate of a feeding tray to a printing position. Since the sheet needs to be accurately positioned with respect to the pressure plate, the pressure plate is provided with side guides that restrict the side edges of the sheet. These side guides generate back tension against the sheet due to frictional resistance with the sheet, which may affect sheet conveyance accuracy. Therefore, the feeding device of Patent Document 1 is configured to move the side guide in the width direction of the sheet in conjunction with the vertical swing of the pressure plate. As a result, the side guide can be spaced apart from the side edge of the sheet.

JP2006-89278A

However, in the configuration of Patent Document 1, the mechanism becomes large because the pressure plate is moved in the width direction of the sheet. Further, there is a possibility that the sheet also moves in the width direction as the pressure plate moves. If only the sheet near the bottom layer of the pressure plate moves in the width direction, the positions of the side edges will vary among the plurality of sheets. In such a case, when the pressure plate returns to its original position, folds or scratches occur on the side edges of the sheet.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a printing apparatus that can move a side guide without moving a pressure plate in the width direction of a sheet.

The printing apparatus of the present invention includes a pressure plate on which a support part is arranged, which places a sheet and forms a support surface for supporting the sheet with a plurality of ribs, and a shifter provided on the pressure plate and movable in the width direction of the sheet. a member, a first side guide and a second side guide that are movably provided on the pressure plate in the width direction and respectively regulate side edges of the sheet in the width direction; and a first side guide and a second side guide that are provided on the first side guide. an engaging member that engages with the shift member; and a conveyance means that conveys the sheet placed on the pressure plate in the conveyance direction, the printing apparatus comprising: an engagement member that engages with the shift member; an interlocking means capable of moving the second side guide in conjunction with movement of the first side guide, and when the conveyance means starts conveying the sheet, the first side guide and the shift The second side guide is moved in the width direction by the interlocking means, and the first side guide and the second side guide are moved in the width direction by the interlocking means. It is characterized in that the side guides are spaced apart from each of the side ends.

When conveying the sheet, by moving the shift member, the side guide can be moved without moving the pressure plate.

FIG. 2 is a perspective view of the main parts of the printing device. FIG. 2 is a cross-sectional view of the main parts of the printing device. It is a perspective view of a feeding unit. (a) A front view of the pressure plate, and (b) a rear view of the pressure plate. FIG. 3 is a cross-sectional view showing a state in which a sheet is placed on a pressure plate. It is a sectional view of a locking mechanism. FIG. 3 is a cross-sectional perspective view of a shift member and a cam portion. It is a top view of the cam part of a base part. FIG. 6 is a diagram showing the positional relationship between the shift member and the cam portion during printing. FIG. 3 is a flowchart diagram during a print operation. FIG. 7 is a front view showing the state of the pressure plate when placing the sheet. FIG. 3 is a cross-sectional view showing the operation of the feeding unit. FIG. 6 is a diagram showing a state in which the side guide is separated from the seat by the shift member. It is a front view of the pressure plate of 2nd Embodiment. FIG. 7 is a rear view of the pressure plate of the second embodiment. FIG. 7 is a rear view of a modification of the pressure plate. It is a sectional view of a side guide and a shift member of a 3rd embodiment. It is a perspective view of the side guide and pressure plate of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
The first embodiment is an inkjet printing device having a feeding unit. Note that the feeding unit is not limited to a printing device, and may be one that feeds sheets to a copying machine, a facsimile machine, or the like. FIG. 1 is a perspective view of the main parts of a printing device, and FIG. 2 is a sectional view thereof. The printing device 1 includes a feeding unit 2, a print head 6, a first pair of conveying rollers 4, a second pair of conveying rollers 5, and the like. The printing device 1 includes functions necessary for printing operations, such as a control section that controls the printing device, a drive section that drives various rollers, a printing section that prints images, and an interface section that communicates with a computer, etc. There is.

The sheet P is fed to the printing position using the feeding unit 2. First, a sheet is placed on the feeding tray of the feeding unit 2. The feeding roller 3 forms a pair with a retard roller 15 to sandwich the sheet P, and feeds the uppermost sheet P from the feeding tray to the first pair of conveying rollers 4 as the feeding roller 3 rotates. . The retard roller 15 has a built-in torque limiter, etc., and has a mechanism that does not feed the second and subsequent sheets stacked on the feeding tray. The fed sheet P is conveyed to the printing position by the first pair of conveyance rollers 4. An edge detection sensor 30 is provided between the feeding roller 3 and the first pair of conveying rollers 4 to detect the leading or trailing edge of the sheet on the conveying path. When the edge detection sensor detects the leading edge of the sheet P, the transport roller pair 4 starts operating.

The print head 6 that prints an image can reciprocate in a direction B that intersects the conveyance direction A of the sheet P. An image is printed on the sheet P by ejecting ink from the print head 6. By alternately repeating conveyance of the sheet P and scanning of the print head 6, an image is formed on the sheet P line by line. The sheet P on which the image has been printed is discharged to a discharge section (not shown) by the second pair of transport rollers 5. Note that the printing device 1 is connected to a computer (not shown), and the user can print images from the computer or the like.

(Feeding tray pressure plate)
Next, the pressure plate of the feeding tray provided in the feeding unit will be explained using FIGS. 3 to 5. FIG. 3 is a perspective view of the feeding unit. The feeding unit 2 has a base portion 7 provided with a feeding tray on which sheets are placed. The feeding tray is composed of a pressure plate 8, a first side guide 9, a second side guide 10, and a shift member 11. The pressure plate 8 has a support surface in a range surrounded by a pressure plate rib 8D and a pressure plate rib 8E that come into contact with the sheet, and rotation supports 8A and 8B at both ends thereof. Further, the rotation supports 8A and 8B are fitted into holes 7A and 7B provided in the base portion 7, respectively, and can swing in the vertical direction with respect to the base portion 7. The pressure plate 8 is provided with a shift member 11 that is movable relative to the pressure plate 8, and a first side guide 9 and a second side guide 10 that regulate the position of the side edge of the sheet P. Furthermore, a friction pad 31 that comes into contact with the sheet P is provided at the center of the pressure plate 8 .

FIG. 4(a) is a front view of the pressure plate, and FIG. 4(b) is a rear view of the pressure plate. The shift member 11 is guided relative to the pressure plate 8 by the ribs 11B and 11C of the shift member 11 and the opening 8F of the pressure plate, and is movable in the C direction. Further, the first side guide 9 engages with an opening 11E provided in the shift member 11, and is moved in the C direction (width direction of the sheet) relative to the shift member 11 by being guided by the pressure plate ribs 8D and 8E. The shift member 11 can be connected to the shift member 11 . Therefore, the shift member 11 and the first side guide 9 can each move relative to the pressure plate 8. On the other hand, the second side guide 10 engages with an opening 8G provided in the pressure plate 8, and is connected to the pressure plate 8 so as to be movable in the C direction by being guided by the pressure plate ribs 8D and 8E. Therefore, the first side guide 9 can regulate one side edge of the sheet P, and the second side guide 10 can regulate the other side edge of the sheet P.

Note that the first side guide and the second side guide may have a structure that engages with a plurality of openings provided in the pressure plate.

A first rack 12 is fixed to the back surface of the first side guide 9 through an opening 11E, and a second rack 13 is fixed to the back surface of the second side guide 10 through an opening 8G. There is. Furthermore, a pinion gear 14 is provided between the first rack 12 and the second rack 13, which can be freely rotated by the rotation support shaft 8C of the pressure plate 8. The pinion gear 14 meshes with the first rack 12 and the second rack 13, respectively. Therefore, when the first side guide 9 is moved, the second side guide 10 is also moved in the opposite direction in conjunction with the movement. Since the first side guide 9 and the second side guide 10 move with the feeding roller 3 as a reference, the center of the sheet P can be positioned with respect to the feeding roller 3 regardless of the size of the sheet. Note that the first side guide 9 and the first rack 12 may be composed of two members or may be composed of one integral member. Further, the second side guide 10 and the second rack 13 may be composed of two members or may be composed of one integral member.

The friction pad 31 plays a role of holding onto the pressure plate 8 all but one of the placed sheets P that comes into contact with the feeding roller 3 . The friction coefficient between this friction pad 31 and the sheet is larger than the friction coefficient between the sheets.

FIG. 5 is a sectional view showing the sheet placed on the pressure plate. When the sheet P is placed on the pressure plate 8, the sheet P is supported by coming into contact with a support surface formed by two pressure plate ribs 8D and 8E (support portion) of the pressure plate 8. Note that the center pressure plate rib 8H may form part of the support surface. On the other hand, the ribs 11B and 11C of the shift member 11 are configured to be lower than the support surface formed by the two pressure plate ribs 8D and 8E. For this reason, the range of the shift member 11 facing the sheet is configured to be difficult to come into contact with the surface of the sheet P. Similarly, the opposing portions (plane 9A and plane 10A) of the first side guide 9 and the second side guide 10 that face the surface of the sheet P are lower than the support surface formed by the pressure plate ribs 8D and 8E. It is configured. In this way, the opposing portion moves below the sheet P in the in-plane area of the support surface. Therefore, even if the shift member 11, the first side guide 9, and the second side guide 10 move, the pressure plate 8 comes into contact with the sheet P, so that the position of the sheet P does not shift. In addition, if the static frictional force when supporting the sheet P on the facing part is smaller than the static frictional force when supporting the sheet P on the plane formed by the pressure plate, the facing part is at the same height as the supporting surface. Also good.

(Movement of side guide by shift member)
Here, a mechanism for fixing the first side guide 9 to the shift member 11 will be explained. FIG. 6 is a sectional view of the side guide locking mechanism. A locking member 16 is provided on the first side guide 9, and the locking member 16 is rotatable in the direction shown by arrow R. An engaging pawl 16A is provided at one end of the locking member 16, and an operating portion 16B for releasing the lock is provided at the other end. The engaging claw 16A is fixed by being biased by a sawtooth portion 11A (engaging member) that has a continuous sawtooth shape in the moving direction of the first side guide 9 provided on the shift member 11.

The first side guide 9 can be moved relative to the shift member 11 by the user tilting the lock member 16B outward. In this case, the first side guide 9 and the second side guide 10 can be moved in conjunction with the first side guide 9 relative to the pressure plate 8. Further, when the user releases the locking member 16B, the engaging claw 16A is urged by the sawtooth portion 11A, and the position of the first side guide 9 is fixed to the shift member 11. In this case, the first side guide 9 moves together with the shift member 11. Moreover, when the first side guide 9 moves, the second side guide 10 also moves in the opposite direction in conjunction with it.

Note that as a means for fixing the first side guide 9 to the shift member 11, frictional engagement may be used instead of the sawtooth portion and the engagement claw. Alternatively, the locking mechanism may not have an operating section and may be a frictional engagement that brings the first side guide 9 into contact with the shift member. In this case, the shift member is urged against the pressure plate by a force stronger than the frictional force generated between the shift member and the side guide. As a result, only the side guide can be moved when placing a sheet, and the side guide can be moved together with the shift member when conveying the sheet.

Next, a mechanism for moving the shift member 11 will be explained. FIG. 7 is a cross-sectional perspective view of the shift member and the cam portion, and FIG. 8 is a top view of the cam portion of the base portion. The shift member 11 is provided with a follower projection 11D, and the base portion 7 is provided with a cam portion 7C consisting of a groove for the follower projection 11D. The follower protrusion 11D and the cam portion 7C engage with each other to form a cam mechanism by swinging the pressure plate 8. The groove of the cam portion 7C has two positions, a first position 7C1 and a second position 7C2. The first position 7C1 is the position when a sheet is placed, and the second position 7C2 is the position when printing. FIG. 9 shows the positional relationship between the shift member and the cam section during printing. The follower protrusion 11D is engaged with the second position 7C2. By moving the follower protrusion 11D to the second position 7C2, the shift member 11 moves outward (in the width direction of the seat). The first side guide and the second side guide move in conjunction with the shift member 11. As a result, the first and second side guides can be separated from the sheet P. Further, the distance that the shift member 11 moves is constant regardless of the sheet width. Note that the shift member may be moved by an actuator such as a motor or an electromagnetic solenoid without using the rocking of the pressure plate.

(flowchart)
FIG. 10 is a flowchart of the printing operation of the printing device.

Start with step S200. The user places the sheet P on the pressure plate 8 with the first side guide 9 and the second side guide 10 separated by the width of the sheet (FIG. 11(a)). Next, the first side guide 9 and the second side guide 10 are moved to a point where the width of the sheet is equal to the width of the sheet, and the side guide and the sheet P are brought into contact with each other (FIG. 11(b)). Thereby, the position of the sheet P in the width direction is determined.

Feeding is started in step S201. A user instructs the printing apparatus 1 to print from a computer.

The feeding operation is started in step S202. Here, the operation at the start of feeding will be explained using FIG. 12. When the sheet P is placed on the pressure plate 8, the feeding roller 3 is in a position away from the sheet P (FIG. 12(a)). The feed roller 3 rotates in response to a print instruction, and the pressure plate 8 moves to a position where the sheet P and the feed roller 3 come into contact (FIG. 12(b)). As a result, feeding of the sheet P by the feeding roller 3 is started.

In step S203, the edge of the sheet is detected. When the sheet P is fed normally, the leading edge of the sheet P is detected by the edge detection sensor 30 at a predetermined time from the start of feeding. When the sheet P is detected, the process advances to step S205. If the leading edge of the sheet P is not detected after a predetermined period of time in step S203, the feeding operation is stopped in step S204. It also causes the computer to display an error.

Oblique correction is performed in step S205. The sheet P is fed in the conveyance direction A by a predetermined distance from the time when the edge detection sensor 30 detects the leading edge of the sheet P. The predetermined distance is a distance slightly longer than the distance between the edge detection sensor 30 and the first conveyance roller pair 4. At this time, the first conveying roller pair 4 does not rotate. Therefore, the leading edge of the sheet P is prevented from moving in the downstream direction by the first pair of conveying rollers 4, and becomes parallel to the first pair of conveying rollers 4. Further, the first side guide 9 and the second side guide 10 guide the sheet P so that it does not move away from the side edge portion of the sheet P and does not shift in the direction perpendicular to the conveying direction A. In other words, if the sheet P is skewed, the sheet P will be deflected to some extent.

In step S206, rotational driving of the conveyance roller is started. During the printing operation, the sheet P is conveyed with respect to the feeding roller 3 by a highly accurate first conveying roller pair 4. That is, it is necessary to pass the sheet P from the feeding roller 3 to the first pair of conveying rollers 4. The feeding roller 3 further feeds the sheet P a predetermined distance. At the same time, the first conveying roller pair 4 starts rotating. As a result, the sheet P is sandwiched between the first pair of transport rollers 4. In this way, the pair of transport rollers 4 can transport the sheet P.

In step S207, the side guides are separated. When conveyance of the sheet P is started by the first conveyance roller pair 4, the pressure plate 8 moves in a direction away from the feed roller 3 (FIG. 12(c)). When the pressure plate 8 moves, the follower protrusion 11D of the shift member 11 moves to the second position 7C2. As a result, the first side guide 9 and the second side guide 10 move in the D direction and the E direction, respectively, and are separated from the sheet P (FIG. 13). Further, the retard roller 15 separates from the feed roller 3, and the rotation of the feed roller 3 ends.

The image is printed in step S208. By alternately carrying the sheet P by the pair of carrying rollers 4 and scanning the print head 6, an image is formed line by line. During printing, the first side guide 9 and the second side guide 10 are separated from the side edges of the sheet P, so that back tension on the sheet P during conveyance can be reduced. As a result, the sheet P can be transported with good transport accuracy.

The sheet is discharged in step S209. When the sheet P is discharged to the paper discharge tray by the second pair of transport rollers 5, the pressure plate 8 is moved to the initial position (FIG. 12(a)). As a result, the first side guide and the second side guide return to the positions where they come into contact with the sheet P again due to the movement of the shift member 11. Note that if the image is to be printed on the next sheet, the process returns to step S202.

The process ends in step S210.

As described above, according to the present invention, the side guide can be moved by moving the shift member when conveying the sheet. As a result, no folds or scratches occur on the sheet.

(Second embodiment)
In the first embodiment, the side guides at both ends of the sheet can be moved when the sheet is placed, but in the second embodiment, one of the side guides at both ends of the sheet can be moved by the user. It is. Here, the pressure plate 108 will be explained, and the other parts will be omitted because they are the same as in the first embodiment. 14 is a front view of the pressure plate 108, and FIG. 15 is a rear view of the pressure plate 108.

The feeding tray includes a pressure plate 108, a shift member 111, a first side guide 109, and a second side guide 110. The shift member 111 is provided movably with respect to the pressure plate 108. Further, the first side guide 109 is connected to the shift member 111 so as to be movable in the F direction (width direction of the seat). Therefore, the first shift member 111 and the first side guide 109 can each move relative to the pressure plate 108. On the other hand, the second side guide is movably connected to the pressure plate 108.

Unlike the first embodiment, a first rack 112 is fixed to the back surface of the shift member 111. Further, as in the first embodiment, a second rack 113 is fixed to the back surface of the second side guide 110. A pinion gear 114 is provided between the first rack 112 and the second rack 113 and can be freely rotated by a rotation support shaft 108C of the pressure plate 108. Pinion gear 114 meshes with first rack 112 and second rack 113, respectively. Therefore, the shift member 111 and the second side guide 110 can move in opposite directions.

The first side guide 109 is provided with a locking member 116, and similarly to the first embodiment, an engaging pawl engages with the sawtooth portion 111A (engaging member) of the shift member 111 and locks the shift member 111. Fixed. When the lock is released, only the first side guide can be moved relative to the second side guide.

Further, the shift member 111 is provided with a follower protrusion 111D, and the base portion 7 is provided with a cam portion 7C as in the first embodiment. The follower protrusion 111D and the cam portion 7C engage with each other to form a cam mechanism by swinging the pressure plate 108.

Here, the operation of the pressure plate 108 will be explained. The user places the sheet P on the pressure plate 108 by abutting it against the side end of the second side guide 110. The user moves the first side guide 109 in the G direction in FIG. 14 with the lock released, and when the width of the sheet P is reached, the position of the first side guide 109 is determined. When the pressure plate 108 swings and the follower protrusion 111D moves to the second position 7C2, the shift member 111 moves in the H direction. When the shift member 111 moves in the H direction, the first side guide 109 also moves by the same distance. Further, the second side guide 110 fixed to the second rack 113 also moves by the same distance in the I direction. In this way, during printing, the first side guide 109 and the second side guide 110 separate from the side edges of the sheet P, so that back tension on the sheet P during conveyance can be reduced.

Note that the follower protrusion 211 may be provided on the back surface of the second side guide 110 instead of on the shift member 111 (FIG. 16). By moving the follower protrusion 211D in the J direction by swinging the pressure plate 108, the first side guide can be moved in the K direction.

As described above, according to the present invention, the side guide can be moved by moving the shift member when conveying the sheet. As a result, no folds or scratches occur on the sheet.

(Third embodiment)
In the first embodiment, the side guide is fixed to the shift member by the lock mechanism 16. In a third embodiment, the side guide is engaged with the shift member by frictional engagement. Here, the side guide and the shift member will be explained, and since the other parts are the same as in the first embodiment, the explanation will be omitted. FIG. 17 shows a cross-sectional view of the side guide and the shift member, and FIG. 18 shows a perspective view of the side guide and the pressure plate.

The shift member 211 is provided on the pressure plate 208 so as to be movable in the width direction of the sheet. Further, a first side guide 209 for regulating one side edge of the sheet is provided on the pressure plate 208 so as to be movable in the width direction of the sheet. Note that a second side regulating the other side end of the sheet is also provided on the pressure plate 208 so as to be movable in the width direction of the sheet. A first rack is fixed to the back surface of the first side guide 209, and a second rack is fixed to the back surface of the second side guide. Further, a pinion gear that can freely rotate with respect to the pressure plate 208 is provided between the first rack and the second rack. The pinion gear meshes with the first rack and the second rack, respectively.

A friction pad 260 (engaging member) that applies a frictional load is provided on the side of the first side guide 209 that faces the shift member 211 . The friction pad 260 is made of, for example, square urethane foam. However, in order to adjust the coefficient of friction, a Teflon (registered trademark) sheet, rubber, or plastic material may be used. The friction pad 260 is biased against the sliding surface 211A of the shift member 211. Although the sliding plane 211A is a mirror surface, it may be made rough to increase the coefficient of friction. Further, the shift member 211 can move relative to the pressure plate 208 in the width direction of the sheet when a force stronger than the static friction force between the shift member 211 and the side guide 209 is applied.

Therefore, by biasing the friction pad 260 of the first side guide 209 against the shift member 211, it is possible to generate a friction force opposite to the force in the width direction of the seat. This frictional force causes the first side guide 209 to engage with the shift member 211. That is, by applying a force greater than the static friction force to the first side guide 209, the first side guide 209 can be moved relative to the shift member 211. At this time, the second side guide moves in a direction opposite to the moving direction of the first side guide 209 in conjunction with the first side guide 209. The dynamic friction force at this time is usually about 300 to 800 gf in order to operate naturally and without discomfort.

Furthermore, when the shift member 211 is moved without applying any force to the first side guide 209, the first side guide 209 moves together with the shift member 211 due to static frictional force. At this time, the second side guide moves in a direction opposite to the moving direction of the first side guide 209 in conjunction with the first side guide 209. In this way, the first side guide 209 can be fixed to the shift member 211 even without the lock member 16.

When placing the sheet P on the tray, the user opens the first side guide 209 from the width of the sheet. At this time, the first side guide 209 and the second side guide mutually move away from the side edge of the sheet. After placing the sheet P, the first side guide 209 and the second side guide are moved to a position where the sheet width is equal to the width of the sheet. When these side guides move, the shift member 211 does not move. The sheet P is supported by coming into contact with a support surface formed by two pressure plate ribs 208D and 208E of the pressure plate 208.

On the other hand, the shift member 211 is configured to be lower than the support surface formed by the two pressure plate ribs 208D and 208E. For this reason, the range of the shift member 211 facing the sheet is configured to be difficult to come into contact with the surface of the sheet P. Similarly, the opposing portions (plane 209A, plane of the second side guide) of the first side guide 209 and the second side guide that face the surface of the sheet P are support surfaces formed by the pressure plate ribs 208D and 208E. It has a low configuration. As a result, the opposing part moves under the sheet in an area in the plane of the support surface. Therefore, even if the first side guide 209 and the second side guide move in the width direction of the sheet together with the shift member 211, the position of the sheet P will not shift because the pressure plate 208 is in contact with the sheet P. . In addition, if the static frictional force when supporting the sheet P on the facing part is smaller than the static frictional force when supporting the sheet P on the plane formed by the pressure plate, the facing part is at the same height as the supporting surface. Also good.

As described above, according to the present invention, the side guide can be moved by moving the shift member when conveying the sheet. As a result, no folds or scratches occur on the sheet.

2 feeding unit 8 pressure plate 9 first side guide 10 second side guide 11 shift member

Claims (9)

a pressure plate on which a support part is arranged, on which a sheet is placed and a support surface for supporting the sheet is formed by a plurality of ribs ;
a shift member provided on the pressure plate and movable in the width direction of the sheet;
a first side guide and a second side guide that are movably provided on the pressure plate in the width direction and respectively regulate side edges of the sheet in the width direction;
an engagement member provided on the first side guide and engaged with the shift member;
A printing apparatus comprising : a conveyance means for conveying the sheet placed on the pressure plate in the conveyance direction,
comprising interlocking means capable of moving the second side guide in conjunction with movement of the first side guide while the shift member does not move;
When the conveying means starts conveying the sheet, the first side guide and the shift member move in the width direction while being engaged with the engaging member, and the second side guide moves in the width direction. The printing apparatus is characterized in that the interlocking means moves the first side guide and the second side guide in the width direction, and the first side guide and the second side guide are separated from the respective side ends. The printing apparatus according to claim 1, wherein the engagement member frictionally engages with the shift member. 2. The printing apparatus according to claim 1, wherein the engaging member is an engaging claw and engages with a sawtooth portion provided on the shift member. a first facing portion provided on the first side guide and facing the seat;
a second opposing portion provided on the second side guide and facing the seat;
The support surface is formed of a first rib extending in the width direction and a second rib separated in the conveyance direction,
4. The first opposing portion and the second opposing portion move between the first rib and the second rib at a height below the support surface. The printing device according to any one of item 1. The interlocking means includes a first rack provided on the first side guide, a second rack provided on the second side guide, and a first rack provided on the pressure plate and the first rack and the second rack provided on the pressure plate. 5. The printing apparatus according to claim 1 , further comprising a pinion gear connected to each of the racks. a pressure plate on which the sheet is placed and a support portion forming a support surface for supporting the sheet;
a shift member provided on the pressure plate and movable in the width direction of the sheet;
a first side guide and a second side guide that are movably provided on the pressure plate in the width direction and respectively regulate side edges of the sheet in the width direction;
an engagement member provided on the first side guide and engaged with the shift member;
a conveying means for conveying the sheet placed on the pressure plate in the conveying direction;
When the conveying means starts conveying the sheet, the first side guide and the shift member are engaged with each other by the engaging member and move in the width direction, so that the first side guide and the shift member move in the width direction. A printing device in which the second side guide is spaced apart from each of the side edges,
an interlocking hand that moves the second side guide in conjunction with movement of the first side guide;
Equipped with steps,
The interlocking means includes a first rack provided on the shift member, a second rack provided on the second side guide, and a first rack provided on the pressure plate and each of the first rack and the second rack. 1. A printing device comprising: a pinion gear coupled to a pinion gear; a first facing portion provided on the first side guide and facing the seat;
a second opposing portion provided on the second side guide and facing the seat;
7. The printing apparatus according to claim 6, wherein the first opposing section and the second opposing section move in the width direction below a height of the support surface . further comprising a protrusion provided on the shift member and a cam portion provided on the base portion of the printing device,
8. The printing apparatus according to claim 1, wherein the shift member is moved when the protrusion engages with the cam portion. 9. The printing apparatus according to claim 8, wherein the cam section moves the shift member by swinging the pressure plate.

Images