JP2002321414A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer which prevents a printed and discharged recording paper from being taken into a printing means again even when the recording paper is transferred back and forth at a printing operation time. SOLUTION: The printer 1 is provided with the recording paper 2, a paper tray 3 for storing the recording paper 2, and a paper feed roller 9 and a small roller 10 which can transfer the recording paper 2 sent out of the paper tray 3 in a paper feed direction (arrow C) towards the printing means 11 by pressing and holding the recording paper. In a state while the recording paper 2 is pressed to and held by the paper feed roller 9 and the small roller 10, the recording paper can be transferred in the paper feed direction of the arrow C by rotating the paper feed roller 9 in one direction. Moreover, the recording paper 2 can be transferred in a discharge direction opposite to the paper feed direction of the arrow C by rotating the paper feed roller 9 in the other direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer which prevents a recording sheet discharged from a printing unit after printing from being drawn into the printing unit again.

[0002]

2. Description of the Related Art A conventional printer (not shown) includes a paper tray having a pressure plate for raising and lowering a plurality of recording papers stored therein, and raising and lowering the pressure plate to raise the internal recording paper upward. Are brought into pressure contact with the transport rollers. If the conventional printer is described as a thermal printer, for example, a printing unit is provided with a platen and a thermal head that can be pressed against the platen. When the transport roller is rotated while the recording paper that has been raised and lowered by the pressure plate is pressed against the transport roller, the uppermost recording paper is transported in the paper feed direction between the platen and the thermal head. ing. Further, a paper feed roller and a small roller that presses against the paper feed roller are provided downstream of the printing unit in the paper feed direction of the recording paper, and the recording paper fed by the transport roller is pressed and narrowed. I have to have.

A paper discharge roller is provided downstream of the paper feed roller in the paper supply direction and capable of discharging printed recording paper to a paper discharge tray. Then, the recording paper fed from the paper tray to the printing means is pressed and held between the paper feed roller and the small roller, and the forward or reverse rotation of the paper feed roller moves the recording paper upstream in the paper feeding direction. Or, it can be reciprocated to the downstream side. By reciprocating the recording paper, a plurality of inks of different colors are overprinted on the recording paper so that a desired color image can be printed.

The recording paper after printing is conveyed by a paper feed roller to a paper discharge roller on the downstream side in the paper feeding direction, and is discharged to a paper discharge tray by rotation of the paper discharge roller. In such a conventional printer, while printing a color image, the recording paper conveyed downstream from the printing unit in the paper feeding direction has a front end located on a paper discharge tray,
Further, the recording paper conveyed upstream from the printing means in the paper supply direction has a rear end portion located on the paper supply tray.

[0005]

However, in the conventional printer as described above, for example, when a color image is printed, the front end side of the recording paper that is reciprocated and conveyed has a printed end discharged to a discharge tray. When the recording paper is rubbed and static electricity is generated and the recording paper is returned to the upstream side of the printing means in the paper feeding direction, the printed recording paper discharged to the paper output tray side is drawn into the printing means again. There was a possibility that troubles occurred in printing. The present invention has been made in view of the above-described problems.During a printing operation, even if the recording paper is reciprocated, even if the recording paper is printed and discharged,
It is an object of the present invention to provide a printer which is prevented from being drawn into a printing unit again.

[0006]

According to a first aspect of the present invention, there is provided a printer comprising: a recording sheet;
A paper tray for storing the recording paper, a paper feed roller and a small roller capable of pressing and holding the recording paper sent from the paper tray and transporting the recording paper in a paper feeding direction toward a printing unit; With the paper feed roller and the small roller pressed against each other, the paper feed roller can be conveyed in the paper feeding direction by rotating the paper feed roller in one direction, and the paper feed roller can be moved in the other direction. By rotating the recording paper, the printed recording paper conveyed and discharged in the discharge direction by the paper feed roller and the small roller by the paper feed roller and the small roller can be transported in the paper discharge direction opposite to the paper feed direction. A paper pull-in prevention unit for preventing the paper from being drawn again between the roller and the small roller is provided in a part of the paper transport path upstream of the paper feed roller in the paper feeding direction.

As a second means for solving the above-mentioned problem, the paper tray has a sending section capable of sending the recording paper housed therein, and the sending section is provided above the sending section. An openable and closable guide member is arranged, and the sheet pull-in preventing portion is formed in a part of the guide member.

As a third means for solving the above-mentioned problems, the guide member has a turning base and an opening / closing plate extending from the turning base to the paper feed roller side.
The feeding portion of the paper tray can be opened and closed by the rotation of the opening / closing plate, and the paper pull-in preventing portion is formed on the upper surface of the opening / closing plate. Further, as a fourth means for solving the above problem, the paper pull-in preventing portion is formed so as to protrude in a hook shape on the upper surface of the opening / closing plate.

According to a fifth aspect of the present invention, the guide member is configured such that when the recording sheet is sent from the sheet tray, the opening / closing plate pivots upward to open the sending section. When the recording paper, which has been sent from the paper tray, is conveyed in the paper discharging direction, the opening / closing plate rotates downward to close the sending portion, and the recording paper passes over the upper surface of the guide plate. Configuration.

As a sixth means for solving the above-mentioned problems, the paper tray is formed by being divided into two upper and lower tiers, and a paper feed tray section for storing the recording paper before printing is provided in a lower tier, An upper tray has a discharge tray portion where printed recording paper discharged from the printing unit is located.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printer according to the present invention will be described below with reference to FIGS. First, FIGS. 1 to 4 are schematic views for explaining the operation of the printer according to the present invention, FIG. 5 is a side view of a main part for explaining the operation of the guide member according to the present invention, and FIG. It is an external appearance perspective view of.

As shown in FIG. 1, the printer 1 of the present invention is provided with a paper tray 3 capable of storing a large number of recording papers 2 of a predetermined size. The paper tray 3 is divided into two upper and lower tiers by a partition plate 3a. The lower tier is a paper feed tray unit 4 capable of storing the recording paper 2 before printing, and the upper tier is discharged from a printing unit 11 described later. And a paper discharge tray section 5 on which the printed recording paper 2 is located. The partition plate 3a can be opened and closed up and down.
When the recording paper 2 stored in the printer is exhausted, the partition plate 3a can be opened and replenished.

On the lower wall 3b of the paper feed tray 4,
A flat pressure plate 6 is arranged so that the other side can be moved up and down around a fulcrum 6 a formed on one side as a rotation center, and the recording paper 1 before printing is placed on the pressure plate 6. Is to be placed. The other side of the pressure plate 6 is always elastically urged above the arrow A with the fulcrum 6a as the center of rotation, and the other side can be lowered below the arrow B by descent means (not shown). As shown in FIG. 6, the paper tray 3 is detachable from a paper supply / discharge port 1b formed on one side of the main body 1a of the printer 1.

On the upper side of the right side wall 4a of the sheet feeding tray 4 shown in FIG. 1, there is provided a groove-shaped feeding portion 4b slightly wider than the width of the recording paper 2 stored therein and having a predetermined depth. The recording section 2 inside the sheet feeding tray section 4 can be sent to the outside from the sending section 4b. When the paper tray 3 is mounted on the main body 1a of the printer 1, the side walls 4a
The conveying roller 7 is located on the pressure plate 6 in the vicinity. The transport roller 7 has a cylindrical shape and an outer peripheral portion formed of a member having a large frictional resistance such as rubber.
It is rotatable in the direction of arrow L which is a counterclockwise direction.

When the pressure plate 6 rises above the arrow A, the uppermost recording sheet 2 is pressed against the lower portion of the transport roller 4. By rotating the transport roller 7 in the direction of arrow L while the recording sheet 2 is pressed against the transport roller 4, the uppermost recording sheet 2 is separated from the lower recording sheet 2, and the feed direction indicated by arrow C Can be transported. The recording paper 2 conveyed from the paper feed tray unit 4 passes through the sending unit 4b and is conveyed in a paper feeding direction to the printing unit 11 described later. The printing means 11
As shown in FIG. 3, the recording paper 2 printed with
Is transported in the direction of discharge indicated by arrow D opposite to the direction of paper feed of
The paper can be discharged to the paper discharge tray 5 through the upper part of the transport roller 7 guided on the upper surface of a guide member 8 described later.

A rotating base 7a of a guide member 8 is rotatably supported on a rotating shaft 7a, which is the center of rotation of the transport roller 7. Further, the guide member 8 includes a pivot base 8a.
A tongue-shaped opening / closing plate 8b is formed to extend to the paper feed roller 9 described later. The opening / closing plate 8b can open and close the feeding section 4b of the sheet feeding tray section 4 by rotating up and down. Further, a part of the upper surface of the opening / closing plate 8b, near the right end in the drawing, is formed with a paper pull-in prevention part 8c that protrudes upward in a hook shape. The sheet pull-in preventing portion 8c may be formed not only at the tip end of the opening and closing plate 8b but also at a part of the sheet transport path on the upper surface of the opening and closing plate 8b.

A guide member 8 for feeding the recording paper 2 from the paper feed tray 4 rotates the opening / closing plate 8b upward to open the feeder 4b, and the recording paper sent from the paper feed tray 4 is opened. 2 is conveyed along the lower surface of the guide member. When the feeding of the recording paper from the paper feeding toy unit 4 is completed, as shown in FIG. 3, the opening / closing plate 8b rotates downward to close the feeding unit 4b, and the paper feed roller 9 described later causes the arrow C to move. Can be conveyed in the sheet discharging direction indicated by arrow D opposite to the sheet feeding direction. The recording paper 2 conveyed in the paper discharge direction indicated by the arrow D is conveyed along the upper surface of the guide member 8, passes over the conveying rollers 7, and is discharged to the paper discharge tray unit 5 of the paper tray 3. It has become so. At this time, the transport roller rotates in the direction of arrow L to
The paper is discharged to the paper discharge tray section 5.

When the guide member 8 pivots the opening / closing plate 8b upward to open the sending section 4b, the opening / closing plate 8b abuts against a curved lower surface of the ribbon cassette 15, which will be described later, and is further raised. It does not rotate. The guide member 8 rotates the opening / closing plate 8b downward except when the recording sheet 2 is sent out from the sheet tray 3, and the sending unit 4
b is closed. Further, a paper feed roller 9 and a small roller 10 that is in pressure contact with the paper feed roller 9 are disposed downstream of the transport roller 7 in the paper feed direction indicated by arrow C and between a printing unit 11 described below. I have.

The paper feed roller 9 is rotatable in both a clockwise direction and a counterclockwise direction. The small roller 10 follows the rotation of the paper feed roller 9. Is rotatable. Then, the recording paper 2 pressed and held between the paper feed roller 9 and the small roller 10 is pressed.
Can be conveyed in the paper feeding direction indicated by arrow C by rotation of the paper feed roller 9 in one direction. Further, by rotating the paper feed roller 9 in the other direction, the paper can be conveyed in the paper discharge direction indicated by arrow D opposite to the paper supply direction. That is, the recording paper 2 held between the paper feed roller 9 and the small roller 10
Can be conveyed in both directions of arrow C and arrow D.

When the paper feed roller 9 and the small roller 10 press and hold the front end 2a of the recording sheet 2, the pressure plate 3 is moved by the arrow B by the action of the lowering means (not shown).
It is designed to descend below. When the pressure plate 3 descends, the rotation of the transport roller 7 is stopped, and the recording paper 2 stored in the paper feed tray unit 4 is stopped.
Are separated from the transport roller 7.

A printing means 11 is provided downstream of the paper feed roller 9 in the paper feed direction indicated by arrow C.
The printing unit 11 includes a column-shaped rotatable platen roller 12 formed wider than the width of the recording paper 2, and a line-type thermal head that is disposed above the platen roller 12 and that can be moved up and down. 13 are provided and configured. The thermal head 13 is used for the recording paper 2
And a plurality of heating elements (not shown) are formed along the axial direction of the platen roller 12.

Between the platen roller 12 and the thermal head 13 in the head-up state, a wide, sheet-like ink ribbon 14 having a width substantially equal to the width of the recording paper 2 is positioned. It is supposed to. The ink ribbon 14 has two ribbon storage portions 15a, 15
b, and both ends are wound around a take-up reel 16 and a supply reel 17, respectively. The ribbon cassette 15 is detachable from a part of the main body 1a of the printer 1 shown in FIG. 6, and when the ribbon cassette 15 is mounted on the main body 1a, the take-up reel 16 and the supply reel 17 It is engaged with a winding bobbin (not shown) and a supply bobbin (not shown) on the part 1a side, respectively. By rotating the take-up reel 16 by rotating the take-up bobbin, the supply reel 17 is rotated.
Can be wound up.

In the ribbon cassette 15 mounted on the main body 1a, a gap having a predetermined size is formed between the lower surface of the ribbon storage portion 15b on the take-up reel 16 side and the upper surface of the side wall 4a of the paper tray 3. The opening / closing plate 8b of the guide member 8 is disposed in this gap, and the opening / closing plate 8b can move up and down in the gap. When the opening / closing plate 8b is rotated upward to come into contact with the lower surface of the ribbon accommodating portion 15b of the ribbon cassette 15, the feeding portion 4b of the sheet feeding tray portion 4 is opened, and the lower surface of the guide member 8 is moved. Thus, the recording paper 2 in the paper feed tray section 4 can be sent out.

When the open / close plate 8b is rotated downward,
When the sending portion 4b is closed, a gap 18 having a predetermined size is formed between the upper surface of the opening / closing plate 8b and the lower surface of the ribbon accommodating portion 15b, and the recording sheet 2 sent from the sheet tray 3 is transferred to the upper surface of the guide member 8. Along the arrow C or the direction of the arrow D.

The printing operation of the printer 1 according to the present invention will be described in the case of printing a color image by, for example, a thermal transfer printer.
The paper tray 3 in which the recording paper 2 is stored in the paper feed tray unit 4 is mounted. Next, the head lever (not shown) is turned upward to separate the thermal head 13 from the platen roller 12 greatly. When the ribbon cassette 15 is mounted on the main body 1a of the printer 1, the ink ribbon 14
Are located on the platen roller 12, and the take-up reel 16 and the supply reel 17 are engaged with a take-up bobbin (not shown) and a supply bobbin (not shown) on the main body 1a side, respectively. The ribbon cassette 15 includes the ink ribbon 1.
At least Y (yellow), M
A color ink ribbon called a multi-color ribbon in which three primary colors of ink (magenta) and C (cyan) are sequentially and repeatedly applied is stored.

Next, the pressure plate 6 of the paper tray 3 containing a plurality of recording papers 2 is raised in the direction of arrow A, and the recording papers 2 are pressed against the upper conveying roller 7. At this time, as shown in FIG.
Is rotated upward, and the delivery section 4b of the paper tray 3 is opened. Next, when the transport roller 7 is rotated in the direction of arrow L, the uppermost recording sheet 2 is separated from the lower recording sheet 2, and the recording sheet 2 is sent out from the sheet feed tray section 4, and is fed in the direction indicated by arrow C. It is sent out in the paper direction.

The front end 2a of the recording paper 2 sent out in the paper feeding direction indicated by arrow C is conveyed to the paper feed roller 9 and pressed and held between the paper feed roller 9 and the small roller 10. Then, the pressure plate 6 of the sheet tray 3 is lowered, so that the plurality of recording sheets 2 placed on the pressure plate 6 are separated downward from the transport roller 7 and the rotation of the transport roller 7 is stopped. It has become.

Next, the paper feed roller 9 in a state where the recording paper 2 is pressed and held is rotated in one direction which is a clockwise direction, and a platen roller 12 downstream of the paper feed roller 9 in the paper feed direction is formed. The recording paper 2 is fed between the thermal head 13 in the head-up state. At this time, the ink ribbon 14 is located above the recording paper 2 being conveyed. Then, when the recording paper 2 is subsequently conveyed in the paper feeding direction indicated by the arrow C, the rear end portion 2b comes off the guide member 8.

When a sensor (not shown) detects the trailing end 2b of the recording paper 2 that has come off the guide member 8, the rotation of the paper feed roller 9 that has been rotating in one direction is stopped, and the recording paper 2 is rotated. Is performed, and the printing start position is aligned with the heating element (not shown) of the thermal head 13.
At the same time, the opening / closing plate 8b of the guide member 8 rotates downward to close the discharge portion 4b of the paper tray 3, and a gap 18 having a predetermined size is formed between the lower surface of the ribbon cassette 15 and the upper surface of the guide member 8. Is done.

Next, the thermal head 13 is lowered, and the paper feed roller 9 is rotated in the other direction in the counterclockwise direction while the heating element (not shown) is selectively heated according to the print information. The recording paper 2 is conveyed in the paper discharge direction indicated by arrow D. Simultaneously with the conveyance of the recording paper 2 in the paper discharging direction, the ink ribbon 14 is wound on a take-up reel 16, and a new ink ribbon 14 is supplied from a supply reel 17, and the recording paper 2 has the first color, Y (yellow)
Is printed.

The recording paper 2 on which the first color Y image is being printed is transported along the transport path of the gap 18 between the lower surface of the ribbon cassette 15 and the guide member 8 in the paper discharge direction indicated by arrow D. The rear end 2b of the recording paper 2 is
Is transported along the upper surface of the paper tray to the transport roller 7, moves on the transport roller 7, and is transported to the upper discharge tray unit 5 of the paper tray 3. When the printing of the image of the first color Y is completed, the thermal head 13 is moved away from the platen roller 12 to raise the head, and the rotation of the paper feed roller 9 is reversed in one direction in the clockwise direction. To the paper feed direction indicated by arrow C. Transport roller 7 at this time
Is stopped or rotated in the direction opposite to the arrow L.

Next, a sensor (not shown) detects the rear end portion 2b of the recording sheet 2 while the sheet is being conveyed in the sheet feeding direction indicated by arrow C.
When the rotation of the paper feed roller 9 is stopped, the cue of the recording paper 2 is performed, and M (yellow) color is displayed on the image.
(Magenta) color image is overprinted. Then, by repeating the same operation as the above-described printing operation, the C (cyan) color ink is overprinted on the M (magenta) color image, so that the desired color image is printed on the recording paper 2. Then, the printed recording paper 2 is discharged to the discharge tray unit 5. The sending unit 4b of the paper tray 3 during such a printing operation
Is closed by the opening / closing plate 8b of the guide member 8,
The recording paper 2 being printed is not returned to the paper tray 3 side.

As shown in FIG. 4, when the recording paper 2 is returned in the paper feeding direction indicated by arrow C, the rear end 2b of the recording paper 2 located on the paper discharge tray 5 is The rear end portion 2 b is bent by its own weight, and is conveyed in the paper feeding direction indicated by arrow C while rubbing on the printed recording paper 2 ′ previously discharged to the paper discharge tray portion 5. For this reason, for example, static electricity may be generated on the recording paper being conveyed in the paper feeding direction indicated by the arrow C and on the printed recording paper 2 located in the discharge tray unit 5. Due to the static electricity, the printed recording paper 2 located in the paper discharge tray 5 is attracted to the recording paper 2 being printed, and the transport roller 7 is moved from the paper discharge tray 5 as shown in FIG. It may pass and be drawn on the opening / closing plate 8b.

However, since the guide member 8 is formed with the paper pull-in preventing portion 8c which protrudes in a hook shape, the recording paper 2 'adsorbed on the recording paper 2 being conveyed in the paper feeding direction indicated by the arrow C is removed. The sheet is prevented from being pulled into the printing unit 11 by being interrupted by the sheet pull-in prevention unit 8c. That is, in the printer 1 of the present invention, the printed recording paper 2 ′ discharged from the discharge tray unit 5 after being released from the pressure contact between the feed roller 9 and the small roller 10.
Is prevented from being drawn again between the paper feed roller 9 and the small roller 10 by a part of the paper transport path downstream of the paper feed roller 9 in the paper feed direction indicated by arrow C. , The printed recording paper 2 is not drawn into the printing means 11, and the occurrence of printing defects and the like can be prevented.

[0035]

As described above, in the printer according to the present invention, the paper pull-in prevention unit is provided on a part of the paper transport path downstream of the paper feed roller in the paper feed direction indicated by arrow C, so that the color During printing such as printing, when the recording paper is returned to the feeding direction of arrow C, it is possible to prevent the printed recording paper from being drawn into the printing unit. Therefore, it is possible to prevent the occurrence of a printing failure or the like.

In addition, a guide member capable of opening and closing the sending portion is disposed above the sending portion of the paper tray, and a sheet pull-in preventing portion is formed in a part of the guide member. It can be reliably prevented.

Further, the other side of the guide member has an opening / closing plate extending toward the paper feed roller and capable of opening and closing the feeding portion of the paper tray. A part of the upper surface of the opening / closing plate is projected in a hook shape. Since the sheet pull-in preventing portion is formed by the above-described method, it is possible to provide a printer that can easily manufacture the sheet pull-in preventing portion.

Further, since the paper pull-in prevention portion is formed so as to protrude in a hook shape on the upper surface of the opening / closing plate, the printed recording paper drawn into the recording paper being printed is reliably blocked by the paper pull-in prevention portion. It is possible to prevent the occurrence of printing defects and the like.

When sending the recording paper from the paper tray, the guide member rotates the opening / closing plate upward to open the sending portion, and when the recording paper is conveyed in the paper discharging direction after the feeding from the paper tray is completed. Has rotated the opening / closing plate downward so as to close the feeding section, so that the recording paper that has been sent from the paper tray is not returned to the paper tray again, and jams and the like during the printing may occur. Can be prevented.

Further, the paper tray is formed in two stages, and a paper feed tray unit for storing recording paper before printing is provided in a lower stage, and a paper discharge unit in which printed recording paper discharged from a printing unit is located in an upper stage. Since the recording sheet has the tray portion, it is possible to prevent the printed recording sheet from mixing with the recording sheet before printing, and to surely separate the recording sheet.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the operation of a printer according to the present invention.

FIG. 2 is a schematic diagram illustrating the operation of the printer according to the present invention.

FIG. 3 is a schematic diagram illustrating the operation of the printer according to the present invention.

FIG. 4 is a schematic diagram illustrating the operation of the printer according to the present invention.

FIG. 5 is a side view of an essential part for explaining the operation of the guide member according to the present invention.

FIG. 6 is an external perspective view of the printer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer 2 Recording paper 3 Paper tray 3a Partition plate 4 Paper feed tray part 5 Discharge tray part 6 Pressure plate 7 Conveyance roller 8 Guide member 8a Rotation base part 8b Opening / closing plate 8c Paper pull-in prevention part 9 Paper feed roller 10 Small roller 11 Printing means 12 Platen roller 13 Thermal head 14 Ink ribbon 15 Ribbon cassette 16 Take-up reel 17 Supply reel

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[Procedure amendment]

[Submission date] May 11, 2001 (2001.5.1
1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 5

FIG. 2

FIG. 3

FIG. 4

FIG. 6

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C059 AA05 AA09 AA18 AA19 AA22 AA26 AA29 AA30 AA48 AA68 AA73 DD03 DD05 DD13 DD18 DD21 3F101 FA01 FB14 FB15 FC11 FE02 FE11 LA07 LB03 3F343 FA02 FB04 FC01 FC01 HC01 FC01 HC16 JA01 JA14 JA19 JD04 KB03 KB04 KB05 LA03 LA12

Claims (6)

[Claims] 1. A recording paper, a paper tray for storing the recording paper, and a paper feed roller capable of pressing and holding the recording paper sent from the paper tray and transporting the recording paper in a paper feeding direction toward a printing unit. A small roller, and the recording sheet is pressed and held between the paper feed roller and the small roller,
By rotating the paper feed roller in one direction, the paper can be transported in the paper feed direction, and by rotating the paper feed roller in the other direction, the paper can be transported in the paper discharge direction opposite to the paper feed direction. A sheet pull-in mechanism for preventing the printed recording paper conveyed and discharged in the discharge direction by the paper feed roller and the small roller from being drawn in again between the paper feed roller and the small roller. A printer, wherein the prevention unit is provided in a part of a paper transport path upstream of the paper feed roller in the paper feeding direction. 2. The paper tray according to claim 1, further comprising: a delivery unit capable of delivering the recording paper accommodated therein, and a guide member capable of opening and closing the delivery unit disposed above the delivery unit. 2. The printer according to claim 1, wherein said sheet pull-in prevention portion is formed in a part. 3. The guide member has a turning base and an opening / closing plate extending from the turning base to the paper feed roller side. 3. The printer according to claim 2, wherein the printer is openable and closable, and the sheet pull-in preventing portion is formed on an upper surface of the opening and closing plate. 4. The printer according to claim 3, wherein the sheet pull-in preventing portion is formed by projecting in a hook shape on an upper surface of the opening / closing plate. 5. The guide member, when sending the recording paper from the paper tray, the opening / closing plate pivots upward to open the sending unit, and the recording paper that has been sent from the paper tray is finished. 4. The apparatus according to claim 3, wherein, when the sheet is conveyed in the sheet discharging direction, the opening / closing plate pivots downward to close the sending section, so that the recording sheet passes over the upper surface of the guide plate. Or the printer according to 4. 6. The paper tray is formed by being divided into upper and lower tiers, a paper feed tray section for storing the recording paper before printing is provided on a lower tier, and a printed tray discharged from the printing means is provided on an upper tier. The printer according to any one of claims 1 to 5, further comprising a discharge tray section on which recording paper is located.