JP2001199596A - Recording device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a recording apparatus capable of detecting a sheet regardless of where the sheet is set, correcting a skew of the sheet, and incorporating a skew detection apparatus. It is an object of the present invention to provide a recording device. SOLUTION: A table 16 mounted on a casing 12, a carrier 72, a print head 74, a platen 76, a pair of sheet conveying rollers 60, 62, and a shaft 26 rotatably mounted on the casing 12.
And a plurality of protrusions 36 provided on the shaft 26 at intervals in the axial direction and at different angles in the circumferential direction, and are arranged at intervals on a line parallel to the shaft 26 to detect the presence or absence of a sheet. A plurality of supply sensors, the sheet is conveyed toward the sheet conveying rollers 60 and 62 by the projections 36, and the sheet is conveyed to the sheet conveying rollers 60 and 62.
, The skew of the sheet is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus provided with a sheet feeding apparatus for feeding a sheet while automatically correcting the skew of the sheet, and more particularly, to a whole area set (random set) of the sheet. To a recording device.

[0002]

2. Description of the Related Art A printer includes a print head supported by a carrier, and a platen opposed to the print head. A sheet is transported between the print head and the platen by a pair of sheet transport rollers. Is to be printed. The sheets can be fed to the sheet transport rollers automatically or manually.

When a sheet is fed toward a sheet conveying roller, there is a problem that the sheet is skewed. Skew is likely to occur when feeding sheets manually. The skew is a phenomenon in which the upper end of the sheet (the side of the preceding sheet in the conveying direction) is supplied obliquely to the sheet conveying roller. When the sheet is skewed and supplied to the sheet conveyance roller, the sheet conveyance roller conveys the sheet to the print head while skewed, and printing is not properly performed on the sheet. Therefore, if the sheet is skewed when feeding the sheet, it is desired to correct the skew of the sheet.

[0004] Japanese Patent Application No. 10-07164, which is a prior application of the present application.
No. 4 discloses a sheet feeding device capable of correcting skew of a sheet. The sheet feeding device includes a frame having a sheet conveying surface, a shaft rotatably disposed above the sheet conveying surface, and a shaft spaced apart in an axial direction of the shaft and at different angles in a circumferential direction. And a rotating device for rotating the shaft, the sheet is conveyed by the protrusions along a sheet conveying surface toward a sheet conveying roller in a printer, and the sheet is The skew of the sheet is corrected by abutting the sheet against a conveyance roller.

In this sheet feeding apparatus, when a sheet is fed obliquely, one end of the upper end of the sheet (for example, the left end of the preceding sheet in the conveying direction) is stopped by a sheet conveying roller. Abut When one end of the sheet abuts the sheet transport roller, that edge of the sheet stops, the other portion of the sheet continues to be transported by the protrusion on the shaft, the sheet rotates about the stopped edge, and the sheet is tilted. Rows are corrected. In this case, it is the projection that is engaged with the sheet to convey and rotate the sheet, and the projection does not restrain the sheet like a pair of pinch rollers, so the sheet rotates easily and reliably, The skew of the sheet is corrected.

One supply sensor is arranged to detect that the sheet has been placed on the sheet transport surface of the sheet supply device, and the shaft starts rotating according to the output of the supply sensor to transport the sheet and skew. The correction is made. This supply sensor is disposed at a position on the left side of the sheet supply device. In a printer or the like, the sheet is usually set at the left position, so the supply sensor disposed at the left position can sufficiently detect the presence or absence of the sheet placed on the sheet conveying surface. it can. However, if the seat is set to the right
When a small sheet is set at the center, there is a problem that the supply sensor arranged at the left position cannot detect such a sheet.

Japanese Patent Application No. 10-37464, which is the prior application of the present application.
No. 2 similarly has a plurality of projections provided on the shaft at different angles in the circumferential direction at intervals in the axial direction of the shaft in order to correct the skew of the sheet. Also discloses a sheet feeding apparatus and a recording apparatus including a plurality of feeding sensors arranged at intervals on a line parallel to the shaft to detect the presence or absence of a sheet placed on the sheet conveying surface on the back side. . Thus, the sheet can be detected regardless of the position where the sheet is set, while correcting the skew of the sheet.

[0008]

In the above-mentioned prior application, the sheet feeding device can be optionally attached to a printer. The printer is provided with a table. In order to attach the sheet feeding device to the printer, it is necessary to remove the table and attach the sheet feeding device to the printer. The work of removing the table and attaching the sheet feeding device is performed by the user. Then, the user has to keep the removed table. Therefore, there has been a demand for a printer that incorporates the function of a sheet feeding apparatus so that such an operation is not required. Furthermore, when the printer has a tractor for continuous forms arranged below the table, the tractor for continuous forms cannot be used when the sheet feeding device is attached.

An object of the present invention is to detect a sheet regardless of where the sheet is set, to correct the skew of the sheet, and to incorporate a member for correcting the skew. It is to provide a recording device.

[0010]

A recording apparatus according to the present invention comprises a casing, a table mounted on the casing, a movable carrier, a printhead mounted on the carrier, and a printhead facing the printhead. A platen, a pair of sheet conveying rollers disposed on the table side of the platen, a shaft disposed above the table and rotatably attached to the casing or a member fixed to the casing, A plurality of protrusions provided on the shaft at different angles in the circumferential direction at intervals in the axial direction of the shaft, a rotating device for rotating the shaft, and detecting the presence or absence of a sheet placed on the table And a plurality of supply sensors arranged at intervals on a line parallel to the shaft, and the sheet placed on the table is Conveyed toward the sheet conveying roller, it and the seat characterized in that it has to correct the skew of the sheet by abutting on the sheet conveying roller.

According to this configuration, the sheet can be detected regardless of where the sheet is set on the table, and the entire area of the sheet can be set (random set). What's more, all you have to do is put all kinds of sheets on the table, from relatively large sheets to relatively small sheets,
The sheet can be conveyed while automatically correcting the skew. And by providing a plurality of supply sensors,
It is possible to provide a control to move the carrier when detecting the sheet into the recording device such as a printer or to detect the lower end of the sheet. The simple structure and control can surely correct the sheet and perform suction and discharge. Become like

In this recording apparatus, the table, the shaft for correcting skew, and the plurality of projections provided on the shaft are attached to the casing. That is, the present invention provides a recording device incorporating the skew feeding correction device.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Here, the sheet includes one thin or thick sheet of paper, a bundle of a plurality of sheets such as copy sheets, a passbook, and the like. 1 and 2 are sectional views showing a printer 10 according to an embodiment of the present invention, and FIG.
It is a perspective view which shows the front part of 0. FIG. 4 is a partially enlarged view of FIG.

Referring to FIG. 3, the printer 10 includes a casing 12, which has a front side wall 14.
The table 16 is adapted to be mounted on the front of the casing 12 between the front side walls 14. Operation panel 18
Is provided on the front of the casing 12 above the table 16. In FIGS. 1 and 3, a skew correction device 24 is provided above the table 16 in the casing 12. The printer 10 includes a movable carrier 72, a print head 74 attached to the carrier 72, a platen 76 facing the print head 74, and a first pair of sheet transport rollers disposed on one side of the platen 76. 60,
62 and a second pair of sheet conveying rollers 78 and 80 disposed on the other side of the platen 76. One of each of the sheet conveying rollers 60 and 62 and the sheet conveying rollers 78 and 80 is a driving roller, and the other is a driven roller (pinch roller) that rotates in contact with the driving roller.

Further, in FIG. 1, the printer 10
A first tractor 104 for continuous form located below the table 16 and a first tractor 104 with respect to the platen 76.
Second tractor 106 arranged on the opposite side to the
And a stacker unit 108 disposed on the opposite side of the table 16, and a cut sheet feeder 109 disposed below the stacker unit 108. further,
A transport roller 108a is provided on the stacker unit 108. In FIG. 2, the cut meat feeder 109
Are arranged below the table 16. The sheet supplied to the table 16 passes through the skew correction device 24, is driven by a first pair of sheet conveying rollers 60 and 62, is sent to a print head 74, and is printed, and a second pair of sheet conveying rollers 78, 80, the sheet is discharged to the stacker unit 108 through the transport roller 108a. Note that the first pair of sheet conveying rollers 60 and 62 and the second pair of sheet conveying rollers 78 and 80 are formed similarly to each other, and are rotatable reversibly. Therefore, after the sheet supplied from the table 16 is printed by the print head 74, the sheet can be discharged toward the table 16 by the first pair of sheet conveying rollers 60 and 62.

The continuous form CS fed from the first tractor 104 passes through the nip between the first pair of sheet conveying rollers 60 and 62, is printed by the print head 74, and is printed by the second pair of sheet conveying rollers 78. , 80 and the discharge roller 108a. Second tractor 10
6 passes through the nip between the second pair of sheet transport rollers 78 and 80, is printed by the print head 74, and passes through the nip between the second pair of sheet transport rollers 60 and 62. Is discharged.

The sheet supplied from the cut sheet feeder 109 passes through the nip between the second pair of sheet conveying rollers 78 and 80, is printed by the print head 74, and is printed by the first pair of sheet conveying rollers 60 and 62. It is discharged through the nip in between (FIG. 1). As for the table 16 and the first pair of sheet conveying rollers 60 and 62, an upper sheet guide 110, a lower sheet guide 112, and a passage switching plate 114 are provided. The passage switching plate 114 has one end pivotally attached to the table 16 and the other end resting on the lower seat guide 112. Therefore, the sheet supplied from the table 16 passes between the upper sheet guide 110 and the lower sheet guide 112 through the path switching plate 114, and proceeds toward the first pair of sheet conveying rollers 60 and 62. First tractor 1
04 is used, the continuous form passes under the path switching plate 114, and the path switching plate 114 takes a position swung upward from the lower seat guide 112 by the continuous form, so that the continuous form is formed by the upper sheet guide 110 and the lower sheet guide. Then, the sheet advances to a first pair of sheet conveying rollers 60 and 62 between the sheet conveying rollers 112 and 112.

In FIG. 1 and FIG.
Are connected to the supply shaft 26 at an angle in the axial direction of the shaft 26 and at a different angle in the circumferential direction.
6 includes a plurality of protrusions 36 provided on the supply shaft 6 and a rotation device of the supply shaft 26. 11 to 15 show the skew feeding correction device 24 in more detail. The supply shaft 26 is arranged above the table 16. As shown in FIG. 13, the protrusion 36 is formed as an irregularly shaped roller 38 held on the supply shaft 26. Each shaped roller 38
Has a hub portion held by the supply shaft 26 and two protrusions diametrically opposed from the hub portion, and the protrusion 36 corresponds to the protrusion. In the embodiment, nine irregularly shaped rollers 38 are provided on the supply shaft 26.

As shown in FIGS. 6 and 15, both ends of the supply shaft 26 extend through holes provided in the side wall 12S of the casing 12, and are rotatably supported by bearings provided in the holes of the side wall 12S. You. On the outer surface side of the side wall 12S, a gear 30 is attached to one end of the supply shaft 26. The gear 30 is connected to the supply motor 3 via a gear 32.
4 motor gear 34a. The supply motor 34 is supported by the side wall 12S of the casing 12. Therefore, the supply shaft 26 is driven to rotate by the supply motor 34.

FIG. 14 shows the projection 36 and the phase sensor 40 attached to the supply shaft 26. Protrusion 36
Is approximately 50 on each side in the diameter direction of the supply shaft 26.
There are no protrusions 36 in the angle range of degrees and the angle range of 130 degrees, which is the complement of 50 degrees. With respect to the projection 36 of one irregularly shaped roller 38 on the supply shaft 26, the projection 36 of the next irregularly shaped roller 38 is at a position rotated by about 50 degrees clockwise, and the projection 36 of the next irregularly shaped roller 38 is further rotated. Is at a position rotated about 50 degrees counterclockwise. At the position of the supply shaft 26 shown in FIG.
Neither of the protrusions 36 comes into contact with the sheet on the table 16, and in this state, the sheet is not subjected to the conveying force. The supply shaft 26 has an angular range in which none of the protrusions 36 contacts the sheet on the table 16.

The phase sensor 40 is a fan-shaped double-headed sensor lever 40a attached to the supply shaft 26.
And an optical detector 40b fixed to the side wall 12S of the casing 12. The optical detector 40b includes a light emitting unit and a light receiving unit, and interrupts the optical path every time the sensor lever 40a passes between the light emitting unit and the light receiving unit.
0b generates a signal. The phase sensor 40 detects the angular position of the supply shaft 26,
Used to position the lens at a predetermined angular position (FIG. 14).

As shown in FIG. 11, the supply shaft 2
6 and includes a plurality of supply sensors 42 arranged on a line parallel to the supply shaft 26. Each supply sensor 42 is a reflection type sensor including a light emitting unit and a light receiving unit, and is attached to the upper sheet guide 110 as described later. When there is no sheet on the table 16, light from the light emitting unit is not reflected by the sheet, and the light receiving unit does not detect the presence of the sheet. When there is a sheet on the table 16, light from the light emitting unit is reflected by the sheet, and the light receiving unit detects the sheet.

Further, as shown in FIGS. 11 and 13, the sheet conveying surface 16 a of the table 16 has a depression 44 corresponding to the position of the projection 36. The tip of the projection 36 enters the depression 44, and the sheet P supplied to the sheet conveying surface 16a is conveyed by the projection 36 while being slightly deformed in the depression 44 by being pushed by the projection 36. Depending on the thickness of the sheet P, the conveyance force of the protrusion 36 on the sheet P differs.
For example, when a thin single sheet is conveyed, the sheet P is easily deformed in the depression 44, and the projection 36 is conveyed with a weak feed force while slightly hitting the sheet P. On the other hand, when a thick single-leaf sheet or a slip including a plurality of sheets is conveyed, the sheet P is not easily deformed in the depression 44, and the projection 36 is conveyed with a strong feed force while strongly hitting the sheet P.

As shown in FIG. 11, the shaft 26
In relation to the first pair of sheet conveying rollers 60 and 62
Are located. In the printer 10 of the present invention, a large screen
Auto P_LAnd small sheet P_STransport 16 tables
Set at a desired position in the entire area of the feeding surface 16a (random setting)
G) can be done. In the example shown in FIG.
Is a large sheet P_LIs to the left like a normal printer
And the small sheet P_SIs placed in the center position
Have been. In the specifications of the printer 10, the maximum usable
A small sheet width PW is set. In FIG.
Small sheet P _SIs shown as the minimum sheet width PW
It is. If the width of the sheet used is larger than PW,
The sheet is firstly moved by the projection 36 of the supply shaft 26.
Supplied to the pair of sheet conveying rollers 60 and 62.
The skew is automatically corrected during the supply process.

The distance L between the supply sensors 42 in the axial direction of the shaft 26 is equal to or less than PW (L <PW). Therefore, even if a sheet P _S of a small width, when the sheet width is greater than the minimum sheet width PW, also the sheet P _S is set to the position of the sheet conveying surface 16a throat, presence or absence of the sheet at least It is detected by one supply sensor 42. The distance M between the protrusions 36 on the shaft 26 in the axial direction of the shaft 26 is equal to or less than １ ／ PW (M <1/1).
2PW). Therefore, at least 2
The two protrusions 36 can be engaged with the sheet, and the sheet can be abutted against the first pair of sheet conveying rollers 60 and 62 by the protrusion 36 of the supply shaft 26 to correct the skew of the sheet.

Next, referring to FIG.
The operation of will be described. When the supply sensor 42 detects the presence of the sheet, the rotatable supply shaft 26 having the plurality of protrusions 36 is rotated, and the sheet P is
The sheet is conveyed toward (a nip of) the first pair of sheet conveying rollers 60 and 62. In this case, the sheet P is conveyed only by the frictional force of the protrusion 36 attached to the supply shaft 26.

As shown in FIG. 16A, the sheet P
Is obliquely placed on the sheet conveying surface 16a of the table 16, the first pair of sheets at which one side end of the upper end of the sheet P (for example, the left end of the side of the preceding sheet in the conveying direction) stops. It comes into contact with the transport rollers 60 and 62. When one end of the sheet comes into contact with the sheet conveying rollers 60 and 62, the end of the sheet P stops, and the other part of the sheet continues to be conveyed by the protrusion 36 of the supply shaft 26, and the sheet P moves to the stopped end. Rotate as indicated by the arrow in the center. As a result, as shown in FIG. 16B, the other side of the upper end of the delayed sheet P comes into contact with the first pair of sheet conveying rollers 60 and 62, and the skew of the sheet P becomes skewed. Will be corrected. In this case, even if the plurality of protrusions 36 are in contact with the sheet P, the action of rotating the sheet P is mainly the protrusion 36 at a position distant from one end of the sheet P in contact with the sheet conveying rollers 60 and 62 (this The projections 36 are indicated by solid lines and the other projections 36 are indicated by chain lines). Since the projections 36 are engaged with the sheet P substantially in point contact, the sheet P is easily and reliably rotated, and the skew of the sheet P is corrected. When the sheet is conveyed by nipping the sheet by a pair of pinch rollers instead of the projection 36 shown by a solid line, the sheet is conveyed while being skewed and does not rotate as expected. Not done.

The details of each part of the printer 10 will be further described. As shown in FIG. 4 and FIG.
6 includes a first position (FIG. 4) extending substantially horizontally so that the sheet can be placed thereon, and a second position (FIG. 5A) at an angle to the first position. (A chain line) is movably attached to the casing 12. In the second position, the front of the printer 16 is open to facilitate access to the first tractor 104.

FIG. 6 is a plan view showing the inside of the printer 10, and FIG. 7 is a plan view showing the table 16. As shown in FIG. 7, the table 16 has a sheet conveying surface 16a.
And a movable guide 16b for abutting the left end of the sheet, and guide arm portions 16c located on both side ends. The passage switching plate 114 is pivotally attached to the tip of the table 16. FIG. 8 shows an example of pivotal connection of the passage switching plate 114 to the table 16. The table 16 has pins 16d, and the passage switching plate 114
The passage switching plate 114 is pivotally attached to the front end of the table 16 by fitting the pin 14d and the groove 114a. Therefore, the passage switching plate 114 pivots up and down according to the sheet used as described above to switch the passage of the sheet. The guide arms 16c on both sides are formed so as to sandwich the passage switching plate 114, and the tip of the guide arm 16c protrudes beyond the tip of the passage switching plate 114. A restricting member that restricts the range of the turning angle of the passage switching plate 114 is provided at the tip of the guide arm 16c. Therefore, when the table 16 is detached from the casing 12, the passage switching plate 114
Does not jump out of the width of the guide arm portion 16c and flutters greatly. Even when the table 16 is placed on the floor, the passage switching plate 114 does not directly hit the floor and is not damaged.

The guide arm portion 16c has a first projection 16e projecting outward from the side surface of the table 16 at a tip end thereof, and a second projection 16f projecting outward from the side surface of the table 16 at an intermediate portion. Further, FIG.
As shown in (A), the guide arm 16c extends substantially parallel to the table 16 and has a long groove 16g that branches the tip of the guide arm 16c into a fork shape. The first protrusion 16e is located on a branch above the long groove 16g and has an oval shape.

FIG. 5A shows the inner surface of the front side wall 14 of the casing 12 with a part of the table 16 cut away. FIG. 5B is a perspective view showing the inner side of the front side wall 14 of the casing 12. The front side wall 14 has a protrusion 14a
A substantially horizontal guide groove 14b and a substantially vertical guide groove 14b.
c. The substantially horizontal guide groove 14b terminates at the position of the protrusion 14a, and this end is open. The other end of the substantially horizontal guide groove 14b is expanded upward and downward in an arc shape.

As shown by the solid line in FIG. 5A, when the table 16 is at the first position,
The long groove 16g of the front side wall 14 engages with the protrusion 14a of the front side wall 14, and the first protrusion 16e of the guide arm portion 16c is located at a position on the extension of the substantially horizontal guide groove 14b of the front side wall 14. The second protrusion 16f of the portion 16c engages the lower end of the substantially vertical guide groove 14c of the front side wall 14.
Therefore, the table 16 is stably held at the first position.

In FIG. 5A, when the right end of the table 16 is lifted from the first position, the guide arm 16
The second projection 16f of c rises along the substantially vertical guide groove 14c and comes off from the guide groove 14c. Then, when the table 16 is pulled to the right, the long groove 16g and the protrusion 14a slide with each other, and the first protrusion 16e enters the substantially horizontal guide groove 14b. When the table 16 is further pulled to the right, the engagement between the long groove 16g and the protrusion 14a is released, and the first protrusion 16e and the substantially horizontal guide groove 14b slide with each other. When the first projection 16e reaches the enlarged portion at the right end of the substantially horizontal guide groove 14b, the right end of the table 16 can be further lifted, and the table 16 can be turned toward the second position. As shown in FIG.
In the second position, the table 16 leans against the front wall of the casing 12 and is stably held. By taking the reverse procedure, the table 16 can be easily moved from the second position to the first position.

In FIG. 6, the sheet conveying rollers 60, 6
The shafts 2, 78 and 80 are connected to the side wall 1 of the casing 12.
It is rotatably supported by 2S. Further, FIG.
Hole 74a of print pin portion of print head 74, platen 7
6 and a sheet guide 86 are shown. As shown in FIG. 1, the sheet guide 86 is attached to the carrier 72 so as to face the platen 76, and has a hole 74a for exposing a print pin portion of the print head 74. Seat guide 8
6 is also shown in FIG.

As shown in FIGS. 6 and 11, a pair of sheet upper sensors 84L and 84R are provided on the sheet guide 86. One sheet upper end sensor 84L is arranged on the front side with respect to the center of the print head 74 in the sheet conveying direction, and the other sheet upper end sensor 84R is arranged on the rear side with respect to the center of the print head 74 in the sheet conveying direction. The pair of sheet upper end sensors 84 at the asymmetric positions as described above
With L and 84R, the arrival of the upper end of the sheet at the position of the print head 74 and the skew of the arrived sheet can be detected.

FIG. 9 shows the upper sheet guide 110 of FIG. The upper sheet guide 110 has a hole 36H corresponding to the projection 36 of the supply shaft 26, a hole 60H corresponding to the sheet conveying roller 60, and a hole 42H corresponding to the supply sensor 42. Therefore, the positional relationship between the protrusion 36 and the supply sensor 42 is also known from the positional relationship between the hole 36H and the hole 42H. A circuit board 116 is mounted on the upper surface side of the upper sheet guide 110. In FIG. 9, the circuit board 116 is indicated by a two-dot chain line.

FIG. 10 shows the upper sheet guide 110 of FIG.
4 is a cross-sectional view passing through a hole 42H corresponding to the supply sensor 42 of FIG. The supply sensor 42 is provided on the circuit board 116 facing downward. The supply sensor 42 has a light emitting unit arranged to emit light downward, and light emitted from the light emitting unit passes through a hole 42H of the upper sheet guide 110 and is reflected by a sheet passing under the upper sheet guide 110. And
It passes through the hole 42H and strikes the light receiving portion of the supply sensor 42.

FIG. 17 shows the operation panel 18.
The operation panel 18 is provided at the front of the printer 10. The operation panel 18 has various push buttons, the details of which are omitted, but a skew correction selection push button 18A is related to the present invention. Skew correction selection push button 18
When the skew correction is selected in A, the skew correction device 24 can be operated. Therefore, only when the skew correction is selected, the skew correction device 24 can be used as described above.

If skew correction is not selected with the skew correction selection push button 18A, the skew correction device 24 does not operate, and
The drive motor 34 and the supply shaft 26 do not rotate. The drive motor 34 is stopped in phase alignment so that the projection 36 comes to the initial position shown in FIG. 14, and when the skew correction is not selected, the sheet passing under the projection 36
6 is not contacted. Therefore, even when the skew correction is not selected, the sheet can be manually supplied to the table 16.

FIGS. 18 to 20 show a mechanism for selectively lifting the pinch rollers of the first pair of sheet conveying rollers 60 and 62 and the pinch rollers of the second pair of sheet conveying rollers 78 and 80 from the associated driving rollers. Is shown. The rollers 60 and 78 are pinch rollers, and the rollers 62 and 8
0 is a drive roller. The pinch rollers 60, 78
Are urged toward the drive rollers 62 and 80 by a spring (not shown).

In FIG. 18, the mechanism for lifting the pinch roller includes a slide plate 118 movable in a direction parallel to the sheet conveyance path. Slide plate 118
Is formed to be movable between a left position moved in the direction of arrow A, a right position moved in the direction of arrow B, and a neutral position C between the left position and the right position. Is done. further,
A cam 120a having a protrusion rotatable about the shaft of the drive roller 62 and engageable with the shaft 60a of the pinch roller 60; and a shaft 78a of the pinch roller 78 rotatable about the shaft of the drive roller 80.
And a cam 120b having a protrusion engageable with the
The cams 120a and 120b are pivots 118a,
The slide plate 118 is connected to the slide plate 118 by 118b.

The slide plate 118 is connected to a slide lever 120, and the slide lever 120 is connected to a drive lever 122. The drive lever 122 is turned by drive means such as a motor. Therefore, by turning the drive lever 122, the slide plate 118 can be moved in parallel, so that the cams 120a and 120b can be turned.

FIG. 18 shows a state in which the slide plate 118 is at the right position, and the protrusion of the cam 120a engages with the shaft 60a of the pinch roller 60, and
Is separated from the drive roller 62, and the projection of the cam 120 b is not engaged with the shaft 78 a of the pinch roller 78, so that the pinch roller 78 is urged toward the drive roller 80. Thus, the first tractor 104
Is used, the pinch roller 60 of the first pair of sheet conveying rollers is lifted. The continuous form is conveyed by a second pair of sheet conveying rollers 78 and 80.

FIG. 19 shows a state in which the slide plate 118 is at the left position. Since the protrusion of the cam 120a is not engaged with the shaft 60a of the pinch roller 60, the pinch roller 60 is attached to the drive roller 62. The projection of the cam 120b is engaged with the shaft 78a of the pinch roller 78, and the pinch roller 78 is separated from the drive roller 80. Thus, when the second tractor 106 is used, the pinch roller 78 of the second pair of sheet conveying rollers is lifted. The continuous form is conveyed by a first pair of sheet conveying rollers 60 and 62.

FIG. 20 shows a state in which the slide plate 118 is in the neutral position. Since the protrusion of the cam 120a is not engaged with the shaft 60a of the pinch roller 60, the pinch roller 60 is urged toward the drive roller 62. Since the projection of the cam 120b is not engaged with the shaft 78a of the pinch roller 78, the pinch roller 78 is
It is biased toward zero. In this way, when the table 16 or the cut sheet feeder 109 is used, both the pinch rollers 60 and 78
2,80. The sheets are first and second sheet conveying rollers 60, 62, 78, 8
Conveyed by 0.

Next, the skew detection of the printer 10 having the skew correction device 24 will be described with reference to FIGS. In step S1, it is determined whether a sheet is set on the table 16. Since the four supply sensors 42 are arranged at predetermined intervals, the sheet is
Regardless of which position is set above (random setting), the presence or absence of a sheet is reliably detected by one or more supply sensors 42. When it is detected that the sheet has been set, the sheet detection status is checked in step S2.
The confirmation of the sheet detection status is to check which supply sensor 42 has detected the presence of the sheet, and the centering position of the carrier 72 is determined according to the result. The centering position of the carrier 72 is determined by the upper end sensors 84L and 84R provided on the sheet guide 86.
It is determined based on the sheet upper end sensor 84L located on the left side in FIG. 11 and located on the front side in the sheet conveying direction.

FIG. 23 shows the centering position (moving position) of the carrier 72. In FIG. 23, the four supply sensors 42 are denoted by PSS1 to PSS4. When the four supply sensors 42 are off, as in NO1, the carrier 72 is set to the cut-sheet suction position (that is, the position corresponding to the movable guide 16b). NO
Any one of the supply sensors 42 such as 2, 3, 5, and 9
Is turned on, the upper sheet sensor 84L on the left side of the carrier 72 is set at a position on the extension of the supply sensor 42. When two or more supply sensors 42 are continuously turned on as in NOs 4, 7, 8, 13, 15, and 16, the carrier 72 is located at the center position on the extension of the supply sensors 42. When two or more of the supply sensors 42 are turned on discontinuously as in NO6, 10, 11, 12, and 14, it is determined that there is an error, and the carrier 72 is moved to the cut-sheet suction position.

FIG. 24 shows the centering position of the carrier 72 in the case of NO16 in FIG. 23, and shows that the sheet upper end sensor 84L is located at the center between PSS2 and PSS3. In this case, since the sheet P is detected by the four supply sensors 42 (PSS1 to PSS4),
Sheet P is quite large. In step S3, carrier 7
Center 2 That is, the carrier 72 is moved to the centering position thus set. In step S4, the seat suction amount is determined.

FIG. 25 shows an example of the suction amount of the sheet. FIG.
5, when only one supply sensor 42 detects the presence of a sheet, the number of suction steps is set to N as the suction amount.
Set to 1. The number of suction steps is the number of operation steps of the motor 34 that drives the supply shaft 26 of the skew feeding correction device 24. When the two supply sensors 42 detect the presence of a sheet, the number of suction steps is set to N1-X1. When the three supply sensors 42 detect the presence of a sheet, the number of suction steps is set to N1−X2. When the four supply sensors 42 detect the presence of a sheet, the number of suction steps is set to N1-X3. In this example, N1
Is the maximum, and the number of suction steps gradually decreases. If none of the supply sensors 42 detects a sheet, the value is set to N1 + X5. This means that the number of steps is slightly larger than N1.

Then, in step S5, the motor 34 is driven to rotate the shaft 26, and a suction operation for sucking a sheet from the table 16 into the printer 10 is performed.
In this suction operation, as described above, the sheet is conveyed toward the first pair of sheet conveying rollers 60 and 62 and is brought into contact with the stopped first pair of sheet conveying rollers 60 and 62, Correct the line. The motor 34 is driven by the number of steps determined in step S4. N1 has a large number of suction steps, and N4-X3 has a small number of suction steps. This is because when the number of the supply sensors 42 that detect the presence of the sheet is small, that is, when the paper width is small (postcard vertical writing or the like), the conveyance amount of the protrusion 36 of the shaft 26 is small, and it is difficult to correct. Due to the condition of being set obliquely during setting, the number of suction steps is set to be large. Conversely, when the number of supply sensors 42 that detect the presence of a sheet is large, that is, when the sheet width is large, the amount of conveyance of the protrusion 36 of the shaft 26 becomes large and correction is easy, and Due to the conditions that are difficult to set, the number of suction steps is set to be small.
Even if the number of suction steps is set to a relatively large value, there is no problem in correcting the skew, but the throughput decreases. In addition, if the number of suction steps is set to a small constant value in order to improve the throughput, the suction will be performed with a skew correction incomplete with a narrow sheet.

In step S6, the sheet detection status is reconfirmed. The reconfirmation of the sheet detection status after the rotation of the supply shaft 26 is completed is performed when the sheet is set for the first time or when the skew of the sheet is corrected and the rotation of the supply shaft 26 is completed. This is because the sheet detection situation may be different. However, before reconfirming the sheet detection status, the supply shaft 26 and the transport roller 6
0 and 62 are simultaneously rotated by a predetermined small amount,
The upper end of the sheet is moved to the first pair of sheet conveying rollers 60 and 62.
And fix the sheet to the first pair of sheet conveying rollers 60 and 62.

In step S7, the carrier 72 is re-centered in accordance with the reconfirmation of the sheet detection status. In step S8, the first pair of sheet conveying rollers 60, 62
And the like to drive the seat. The sheet advances toward print head 74. In step S9 of FIG. 22, it is determined whether the upper end of the sheet has been detected. At this stage, the upper end of the sheet is detected by the left upper end sensor 84L.
Is performed based on the output of Left upper edge sensor 8
4L is located near the center of the sheet P as shown in FIG.

The left sheet upper end sensor 84L is the sheet P
After detecting the upper end of the first pair, the first pair of sheet conveying rollers 60, 62 and the like are stopped after being rotated by a predetermined amount while counting up the skew counter in step S10.
Accordingly, the sheet P stops at a position where the upper end of the sheet P exceeds the left sheet upper end sensor 84L. Then, in step S11, the sheet width is detected. The detection of the sheet width is performed using only the left sheet upper end sensor 84L.

In this case, first, the carrier 72 is moved so that the upper end sensor 84L on the left side of the sheet P is located on the left side of the left end of the sheet P. Carrier 72 at this time
In general, the movement position of the supply sensor 42L on the left side of the sheet sensor 42L on the left side of the supply sensor 42 located on the leftmost position among the supply sensors 42 detecting the sheet P is one position further to the left. The position is such that it comes to the position of the sensor 42 (or the position at the left end). For example, in the example of FIG. 24, since PSS1 detects sheet P, PSS1
Of the left sheet upper end sensor 84L is positioned at the left end of the sheet. The sheet guide 86 in this case is shown by a broken line. In this way, the left sheet upper end sensor 84L is located on the left side of the left end of the sheet P regardless of the position of the sheet P on the table. Then, the sheet width is detected while moving the left sheet upper end sensor 84L from the left end of the sheet to the right end of the sheet. Details of the detection of the sheet width are further shown in FIGS.

In step S12 of FIG. 22, it is determined whether the sheet width is smaller than the set minimum value PW.
If the width of the sheet is smaller than the minimum value PW, an error is determined in step S13, and the first pair of sheet conveying rollers 60, 62 and the like and the supply shaft 26 are moved in a direction opposite to the sheet suction direction. The sheet P is rotated to discharge the sheet P to the table 16. If the width of the sheet is larger than the minimum value PW, the carrier 72 is centered to the right end position in step S14. The right end position of the carrier 72 is the distance a from the right end of the sheet P when the upper right sensor 84R of the right sheet is detected.
Position. In the example shown in FIG. 24, the right sheet upper end sensor 84R is determined to be at the position indicated by the chain line. The distance a is preferably set to about several mm.

In step S15, the sheet suction operation by the first pair of sheet conveying rollers 60, 62 and the like is started, and in step S16, the skew feeding counter is updated. Then, in step S17, the right sheet upper end sensor 84R
It is determined whether or not has detected the upper end of the sheet P. When the upper end of the sheet P is detected, in step S18, the sheet conveying rollers 60, 62 and the like are stopped after rotating by a predetermined amount.

Then, in a step S19, it is determined whether or not the sheet is skewed. The skew of the sheet is determined based on whether the value of the skew counter is within a predetermined range. A value obtained by subtracting the number of steps of the sheet conveying motor when the left sheet upper end sensor 84L detects the upper end of the sheet P from the number of steps of the sheet conveying motor when the upper right sheet sensor 84R detects the upper end of the sheet P ( b) is the number of steps corresponding to the distance between the upper end sensor 84L on the left side of the sheet and the upper end sensor 84R on the right side of the sheet in the sheet conveying direction (c) ± a predetermined minute value (d).
The skew is determined by whether or not it is within the range. That is, if cd−b ≦ c + d, it is determined that there is no skew,
Otherwise, it is determined that there is skew.

If it is determined that the sheet is not skewed,
The skew determination routine ends, and the printer 10 performs printing. If it is determined that the sheet is skewed, step S
At 20, a retry is performed. Retry is to reverse the sheet conveying rollers 60 and 62 and the supply shaft 26, discharge the sheet P to the table 16, and then repeat steps S2 to S19 again.

In this manner, the skew of the sheet can be detected by using the left-side sheet upper-end sensor 84L and the right-side sheet upper-end sensor 84R that are arranged to be shifted from each other in the sheet conveying direction. In detecting skew of this sheet,
The upper edge of the sheet P is reliably detected when the upper edge sensor 84L on the left side detects the upper edge of the sheet P, and the upper edge of the sheet P is reliably detected when the upper edge sensor 84R of the right sheet detects the upper edge of the sheet P. Since the detection can be performed, the processing of the detection signal can be easily and reliably performed.

When the width of the sheet P is large, the two sheet top sensors 84L, 84L, which are located at a distance larger than the distance between the two sheet top sensors 84L, 84R fixed to the sheet guide 86 of the carrier 72, Since the skew of the sheet P can be determined based on the output of 84R, the accuracy of the skew determination can be improved. For example, in FIG.
The distance between the two sheet upper end sensors 84L and 84R is e, and the distance between the two sheet upper end sensors 84L and 84R when detecting the upper end of the sheet P is f, where e <f. Therefore, assuming that the above value (b) is the same, the accuracy of the skew determination can be improved by an amount corresponding to an increase in the width direction distance between the detection points.

FIGS. 26 and 27 are diagrams showing a detailed example of the detection of the sheet width in step S11. Step S3
At 0, a carrier movement target position is set in accordance with the maximum printing digit, and at step S31, an internal flag is initialized.
In step S32, it is determined whether or not detection is performed by one sheet upper end sensor. In this embodiment, it is possible to select whether to detect the sheet width using only the left sheet upper end sensor 84L or to detect the sheet width using the pair of sheet upper end sensors 84L and 84R. If the determination in step S32 is NO, in step S33, the sheet width is detected using the pair of sheet upper end sensors 84L and 84R. In this case, the left sheet upper end sensor 84L detects the left end of the sheet, and the right sheet upper end sensor 84R detects the right end of the sheet. In step S34, it is determined whether the detection of the sheet width is successful. When the sheet width is detected in the middle of the sheet skew detection routine of FIGS. 21 and 22, since the upper end of the sheet has not reached the right sheet upper end sensor 84R, the right sheet upper end sensor 84R is The right edge of the sheet cannot be detected. Alternatively, if the right sheet upper end sensor 84R is right from the beginning on the right side of the right end of the sheet, the right end of the sheet cannot be detected by moving the carrier to the right. Therefore, the determination in step S34 is NO. In this case, the process proceeds to step S36B.

If the determination in step S32 is yes,
The sheet width is detected using only the left sheet upper end sensor 84L. In step S35, the sheet end surface is not determined. In step S36, the movement of the carrier 72 from left to right is started. In step S37 of FIG. 27, it is determined whether the left end is being detected. If the determination in step S37 is NO, the process jumps to step S43. If the determination is YES, in step S38, the left sheet upper end sensor 84L
Judge whether or not has detected a sheet. Step S3
If the determination in step 8 is YES, the chatter counter is updated in step S39, and the left chucker counter is incremented by one.
If the determination in step S38 is NO, step S40
Use to reset the chatter counter. In step S41, it is determined whether the chatter counter is larger than W,
If the result is YES, the position of the left end of the sheet is determined in step S42, and the left end detection ends. The position of the left end of the sheet is obtained from the difference between the moving distance of the carrier 72 from the left end position until the chatter counter becomes W and the distance corresponding to the chatter counter becoming W.

In step S43, it is determined whether the right end is being determined. If the determination in step S43 is NO, the process jumps to step S49.
At 44, it is determined whether the left sheet upper end sensor 84L has detected the sheet. If the determination in step S44 is YES, the left sheet upper end sensor 84L is still on the sheet, and the chatter counter is reset in step S46. If the determination in step S44 is no, the chatter counter is updated in step S45. In step S47, it is determined whether or not the chatter counter is larger than W. If the result is YES, the position of the right end of the sheet is determined in step S48, and the sheet width detection ends. In step S49, the movement of the carrier 72 ends. If the determination in step S47 is no, step S47
At 50, it is determined whether or not the stop condition is satisfied.
In step S51, the movement of the carrier 72 ends. If the determination in step S50 is NO, the process returns to step S37.

FIG. 28 shows an example in which the lower end of the sheet P is detected using the supply sensor 42 and the sheet upper end sensor 84L. FIG. 28 shows the supply sensor 42, the sheet upper end sensor 84L, the print head 74, and the sheet P. A line Q indicates a line passing through the sheet upper end sensor 84L, and a line R indicates a line passing through the supply sensor 42. The line S indicates the lower end of the sheet when the lower end of the sheet passes through the line R, and the distance between the line R and the lower end of the sheet (line S) is D. Line T is located between the line R and the line Q, the distance between the line R and the line T and the predetermined value D _0. The line PE indicates the position where the remaining line counter becomes 0. Arrow U indicates the direction in which the sheet P is conveyed.

As an example of detecting the lower end of the sheet, the lower end of the sheet can be detected by using the supply sensor 42. That is, when the lower end of the sheet passes the supply sensor 42 (line R), the remaining line counter is updated (counted down), and when the remaining line counter becomes 0, P
E is notified, and printing is stopped when the bottom margin of the sheet is a predetermined amount.

Referring to FIG. 28, sheet upper end sensor 8
Since 4L is located closer to the print head 74 than the supply sensor 42, when the lower end of the sheet is detected using the upper end sensor 84L, the lower end of the sheet can be detected more accurately. However, since the sheet upper end sensor 84L moves together with the print head 74, it is not always on the sheet P. For example, the sheet top sensor 84L indicated by a virtual line in FIG. 28 is located at a position deviating from the sheet P, and the sheet top sensor 84L indicated by a solid line is above the sheet P. In order to detect the lower end of the sheet using the upper sensor 84L, it is necessary to bring the upper sensor 84L onto the sheet P. Here, this operation is called centering. However, this centering must be performed in the middle of printing, and if the number of times of centering increases, the printing performance of the printer is affected. Therefore, it is preferable to perform centering after the lower end of the sheet approaches the upper end sensor 84L of the sheet as much as possible. FIGS. 29 and 30 are diagrams showing an example of detecting the lower end of the sheet according to the principle described here.

FIG. 29 is a flow chart showing the pre-processing of a line feed. In step S60, it is determined whether the line feed amount is greater than a predetermined amount K. If the result of step S60 is YES, in step S61, the center is set to a position according to the state of the supply sensor. Centering at a position according to the state of the supply sensor 42 means that the carrier 7
2 is moved to the position described with reference to FIG. 23, so that the sheet upper end sensor 84L surely comes above the sheet P.

If the result of step S60 is NO, it is determined in step S62 whether or not the supply sensor 42 is on. If the result of step S62 is no,
If the lower end of the sheet has passed the line R, step S63
In, it is determined whether or not the D> D _0. If yes, the lower end of the sheet has approached line Q in step S64,
As in step S61, centering is performed at a position according to the state of the supply sensor 42. If the result of step S62 is YES and the result of step S63 is NO, the process is repeated.

The centering in steps S61 and S64 is performed before the next line feed when the flag in step 76 in FIG. 30 is set. FIG. 30 is a flowchart of line feed control. In step S71, a line feed phase switching is performed, and in step S72, it is determined whether the supply sensor 42 is on. Step S7
If the result of step 2 is YES, the supply sensor 42 is above the sheet, and the near PE counter is reset in step S74. If the result of step S72 is NO, since the lower end of the sheet has passed the line R in FIG. 28, the near PE counter is updated (set) in step S73. Updating the near PE counter is the same as increasing the distance D in FIG. In step S75, it is determined whether or not D> D _0. That is, it is determined whether the lower end of the sheet has passed the line T.

If the result of step S75 is yes,
Since the lower end of the sheet is sufficiently close to the upper end sensor 84L, a flag for centering is set in step S76. Therefore, before the next line feed, step S
61, and the centering of step S64 is performed. By performing the centering, the upper end sensor 84L of the sheet is reliably located above the sheet, and the lower end of the sheet can be reliably detected. Step S7
If the result of 5 is NO, the flag is reset in step S77.

In step S78, the sheet upper end sensor 84
It is determined whether L has been turned on. If the result of step S78 is yes, the remaining line counter is updated in step S79, and if the result of step S78 is no, the remaining line counter is reset in step S80. Then, in a step S81, it is determined whether or not the remaining line counter is larger than 0. If the result is no, the step S81 is executed.
At 82, a PE flag is set. The PE flag means that there is no more line break. In step S83, it is determined whether the line feed has been completed.

[0072]

As described above, according to the present invention,
Supply shaft, a plurality of protrusions, by providing a plurality of sheet supply sensors at intervals in a direction perpendicular to the sheet conveying direction, even if the sheet is set at random on the sheet conveying surface, the sheet is conveyed, In addition, the skew of the sheet can be corrected. Further, since the skew correction device is incorporated in a recording device such as a printer, it is not necessary to attach or remove the skew correction device. Further, since the skew correction device is incorporated in the recording device in association with other components of the recording device, the function of the recording device can be expanded.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a printer according to an embodiment of the present invention.

FIG. 2 is a diagram showing a modified example of the printer of FIG.

FIG. 3 is a perspective view showing a front part of the printer of FIG. 1;

FIG. 4 is an enlarged sectional view showing a portion including a table of the printer of FIG. 1;

FIG. 5 shows the printer of FIG. 4, wherein (A) is a partially cutaway sectional view showing a side surface of a table and a front side wall of a casing;
(B) is a perspective view showing a front side wall of the casing.

FIG. 6 is a plan view showing the inside of the printer of FIG. 1;

FIG. 7 is a plan view showing a table of the printer shown in FIGS. 1 and 6;

FIG. 8 is a diagram showing a part of a table and a part of a passage switching plate.

FIG. 9 is a plan view showing an upper sheet guide to which a supply sensor is attached.

FIG. 10 is a sectional view of the upper sheet guide of FIG. 9 passing through a supply sensor.

FIG. 11 is a plan view schematically showing the tables of FIGS. 1 and 6, a skew correction device, a sheet conveyance roller, a supply sensor, and a sheet upper end sensor.

FIG. 12 is a perspective view schematically illustrating the skew feeding correction device of FIGS. 1 and 11;

FIG. 13 is a sectional view showing a supply shaft having a plurality of projections and a table.

FIG. 14 is a side view showing a projection and a phase sensor provided on a supply shaft.

FIG. 15 is a side view of a part of a frame for illustrating a rotating device of a supply shaft.

FIG. 16 is a diagram illustrating the principle of correcting skew of a sheet.

FIG. 17 is a diagram illustrating an operation panel of the printer in FIG. 1;

FIG. 18 is a diagram illustrating a mechanism for selectively lifting a pinch roller of a sheet conveying roller from an associated driving roller.

FIG. 19 shows the mechanism of FIG. 18 in another state.

FIG. 20 illustrates the mechanism of FIG. 18 in another state.

FIG. 21 is a flowchart illustrating sheet feeding and skew determination;

FIG. 22 is a flowchart showing a continuation of FIG. 21.

FIG. 23 is a diagram illustrating a relationship between an output of a supply sensor and a carrier movement position.

FIG. 24 is a diagram illustrating a positional relationship between a supply sensor, a sheet guide attached to a carrier, and a sheet.

FIG. 25 is a diagram showing the relationship between the output of the supply sensor and the number of drive steps of the supply shaft.

FIG. 26 is a flowchart illustrating detection of a sheet width.

FIG. 27 is a flowchart showing a continuation of FIG. 26;

FIG. 28 is a diagram illustrating an example in which a lower end of a sheet is detected using a supply sensor and a sheet upper end sensor.

FIG. 29 is a flowchart showing a pre-line feed preprocessing for implementing the principle of detecting the lower end of the sheet in FIG. 28;

30 is a flowchart showing a line feed control for implementing the principle of detecting the lower end of the sheet in FIG. 28.

DESCRIPTION OF SYMBOLS 10 ... Printer 12 ... Casing 14 ... Front side wall 16 ... Table 18 ... Operation panel 24 ... Skew correction device 26 ... Supply shaft 34 ... Supply motor 36 ... Projection 38 ... Deformed roller 40 ... Phase sensor 42 ... Supply sensor 44 ... Recess 60,62 ... Sheet conveyance roller 72 ... Carrier 74 ... Print head 76 ... Platen 78,80 ... Sheet conveyance roller 84L, 84R ... Sheet top sensor 86 ... Sheet guide 104,106 ... Tractor 110 ... Upper sheet Guide 114: passage switching plate 118: slide plate

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Haruhiko Yashima 1405 Daimaru Daimaru, Inagi-shi, Tokyo Inside Fujitsu A Isotec Co., Ltd. (72) Inventor Shinji Sato 1405 Daimaru Daimaru, Inagi-shi, Tokyo Fujitsu A Isotec Co. (72) Inventor Hideaki Kumasaka 1405, Daimaru, Inagi-shi, Tokyo F-term in Fujitsu A Isotec Co., Ltd. 3F102 AA11 AB01 BA02 BB02 CA03 CB06 DA08 EA03 3F343 FA02 FB04 FC11 GA02 GB01 GC01 GD01 HB02 JA09

Claims (14)

[Claims] 1. A casing, a table attached to the casing, a movable carrier, a print head mounted on the carrier, a platen facing the print head, and a platen facing the print head. A pair of sheet conveying rollers disposed, a shaft disposed above the table and rotatably mounted on the casing or a member fixed to the casing, and a circumferentially spaced and circumferentially spaced shaft; A plurality of projections provided on the shaft at different angles in the direction, a rotating device for rotating the shaft, and a space on a line parallel to the shaft for detecting the presence or absence of a sheet placed on the table. A plurality of supply sensors arranged in a row, and the sheet placed on the table is conveyed toward the sheet conveying roller by the projection, and A skew of the sheet is corrected by abutting the sheet against the sheet conveying roller. 2. The apparatus according to claim 1, further comprising an upper sheet guide for guiding a sheet between the table and the pair of sheet conveying rollers, wherein the plurality of supply sensors are attached to the upper sheet guide. The recording device according to claim 1. 3. The apparatus according to claim 2, wherein the upper sheet guide has a hole corresponding to the protrusion of the shaft, a hole corresponding to the pair of sheet conveying rollers, and a hole corresponding to the plurality of supply sensors. Item 3. The recording device according to Item 2. 4. The table has a first position extending substantially horizontally so that sheets can be placed thereon, and an angle with respect to the first position so as to open the front of the recording device. 2. The recording apparatus according to claim 1, wherein the recording apparatus is movably attached to the casing between the second position and the second position. 5. The table has a passage switching plate pivotally attached to a distal end of the table, and a guide arm provided on a side of the distal end of the table so as to sandwich the passage switching plate. The recording apparatus according to claim 4, wherein: 6. The pair of sheet transport rollers will be referred to as a first pair of sheet transport rollers, and a second pair of sheet transport rollers disposed on the opposite side of the platen from the first pair of sheet transport rollers. A pair of sheet transport rollers and a first tractor for continuous form located below the table, which facilitates access to the first tractor when the table is at the second position; The recording apparatus according to claim 4, wherein 7. A second tractor for a continuous form arranged on a side opposite to the first tractor with respect to the platen, wherein one of each of the first and second pair of sheet conveying rollers is provided. Is a driving roller, and the other is a pinch roller, and further, a mechanism for selectively lifting the pinch rollers of the first pair of sheet conveying rollers and the pinch rollers of the second pair of sheet conveying rollers from the associated driving rollers. The recording apparatus according to claim 6, further comprising: 8. A pair of sheet upper end sensors disposed on the carrier, wherein one of the pair of sheet upper end sensors is disposed on the front side with respect to the center of the print head in the sheet conveying direction, and the pair of sheet upper end sensors is provided. 2. The recording apparatus according to claim 1, wherein the other of the sensors is disposed rearward of a center of the print head in a sheet conveying direction. 9. An output of one of the pair of sheet top sensors when the carrier is at the first position and another output of the pair of sheet top sensors when the carrier is at the second position. 9. The apparatus according to claim 8, further comprising means for detecting a skew of the sheet, wherein a distance between the first position and the second position changes according to a size of the supplied sheet. The recording device according to any one of the preceding claims. 10. The recording apparatus according to claim 8, further comprising: means for detecting a lower end of the sheet based on outputs of the pair of sheet upper sensors and the plurality of supply sensors. 11. The projection of the shaft is formed so that a sheet can be manually supplied from the table to the pair of sheet conveying rollers even when the shaft is stopped. 2. The recording device according to 1. 12. The recording apparatus according to claim 1, further comprising: a shaft sheet conveyance amount determining unit that determines a sheet conveyance amount of the shaft according to the number of the supply sensors that detects the presence of a sheet. 13. The recording apparatus according to claim 1, wherein the sheet conveying surface has a depression corresponding to the position of the projection. 14. The recording apparatus according to claim 4, further comprising: means for moving the carrier in accordance with output signals of the plurality of supply sensors.