JP2003054054A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer which can print, with high quality, images to be printed in a printing area without applying a pressing trace of a pressing roller to the printing area by pressing, by the pressing roller, the other area than the printing area of a waiting paper before start of printing. SOLUTION: The printer has a paper feed roller 13 and the pressing roller 14 capable of pressing the paper 11 between the paper feed roller 13 and the roller 14 and rotating following the paper feed roller 13. The paper 11 has a marginal part having a size A from a leading end part 11b to a head line W1 as the first line of the printing area W. With a relation between the size A and size B of a distance between the pressing roller 14 and a printing head 16 being set to B<A, the paper 11 supplied to between the paper feed roller 13 and the pressing roller 14 is transferred to send the leading end part 11b from the pressing roller 14 by a size C smaller than the size B. The pressing roller 14 is accordingly positioned to and kept waiting at the marginal part of the size A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer,
The present invention relates to a printer in which even if a pressure mark is formed on a sheet by pressure contact of a pressure roller of a sheet conveying unit, the pressure mark does not affect print quality.

[0002]

2. Description of the Related Art A conventional printer using roll paper will be described, for example, as a serial type thermal printer. As shown in FIG. It has been placed. Further, a paper feed roller 3 and a pressure contact roller 4 that comes into pressure contact with the paper feed roller 3 with a predetermined urging force are disposed on the left side of the paper placing portion 2 in the figure. The paper feed roller 3 can be driven to rotate in both rightward and leftward directions. And
When the paper 1 is nipped and pressed between the paper feed roller 3 and the pressure contact roller 4 and the paper feed roller 3 is rotated counterclockwise in the drawing (counterclockwise rotation), the paper 1 can be conveyed leftward. ing. Further, when the paper feed roller 3 is rotationally driven in the right direction (clockwise direction) in the drawing, the paper 1 can be returned in the right direction.

A flat platen 5 wider than the width of the sheet 1 is disposed downstream of the sheet feed roller 3 in the leftward transport direction of the sheet 1, and above the platen 5. A thermal head 6 that can be brought into and out of contact with the platen 5 is arranged. The sheet 1 conveyed by the rotation of the sheet feeding roller 3 is positioned on the platen 5 with the thermal head 6 in the head-up state. When the paper 1 is plain paper, an ink ribbon (not shown) is located between the thermal head 6 and the paper 1.

In order to print a desired image on the paper 1 made of such plain paper, the paper 1 and the ink ribbon are positioned between the platen 5 and the thermal head 6, and the thermal head 6 is moved down to drop the ink. Press the ribbon against the paper 1. Then, while selectively heating a plurality of heating elements (not shown) of the thermal head 6 according to the print information,
By conveying the paper 1 in the print row direction which is the width direction, the ink of the ink ribbon is transferred to the paper 1, and a desired image can be printed on the paper 1.

Further, a paper cutting device 7 capable of cutting the printed paper 1 in the width direction is disposed downstream of the thermal head 6 in the leftward conveyance direction of the paper 1. In this paper cutting device 7, a long fixed blade 8 is arranged above the paper 1 conveyed after printing. In addition, fixed blade 8
A rotary blade 9 which is capable of reciprocating along the fixed blade 8 is provided in a state of being in contact with the blade tip surface 8 a of the rotary blade 9, and the rotary blade 9 is rotatably supported by a carriage 10.

In the operation of the conventionally proposed printer having such a structure, first, the paper feed roller 3 is rotated in the counterclockwise direction to generate a heating element (not shown) of the thermal head 6.
Then, for example, the first print line of the print area (not shown) of the paper 1 of the first page is aligned. Then, the thermal head 6 is moved down in the print area along the platen 5 while selectively heating the heat generating elements to print the first print row in the print area of the first page. By repeating such an operation, a desired image can be printed in the print area of the first page of the sheet 1.

The sheet 1 of the first page on which the image printing has been completed is conveyed downstream of the sheet cutting device 7 in the conveying direction of arrow S. When the print area of the first page is completely conveyed to the downstream side of the paper cutting device 7, the paper cutting device 7 is driven to move the carriage 10 along the fixed blade 8 to rotate the rotary blade 9 Rotates to cut the first sheet of paper 1 between itself and the fixed blade 8. Then, the sheet 1a of the first page having the print area on which the desired image is printed is cut into a cut sheet shape and separated from the sheet 1 made of roll paper. Since such a conventionally proposed printer includes a paper cutting device,
The roll paper can be cut into a straight line with a desired length and can be used as an output device for a personal computer or the like.

[0008]

However, in the conventionally proposed printer, the sheet cutting device 7 cuts and separates the sheet 1a of the first page, and then the newly formed sheet 1 of the next page 1 is formed. The tip of the fixed blade 8 and the thermal head 6
It was put back in between and waiting for the next print data to be sent. Therefore, when the print area of the next second page is pressed by the paper feed roller 3 and the pressure roller 4 and the time until the next print data is sent becomes long, the print area of the second page becomes Pressure contact roller 4
A concave pressure contact mark (not shown) is formed by the pressure contact pressure of.

Then, the ink of the ink ribbon is not transferred to the portion of the printing area where the pressure contact mark is generated, which may result in defective printing. In particular, when the paper 1 is, for example, two sheets of paper or a sealing material in which a resin film is pasted on the surface, the surface becomes soft and pressure marks are easily formed even in a short standby time, resulting in defective printing. I was afraid. The present invention has been made in view of the above-mentioned problems, and the paper in standby before printing starts is pressed by a pressing roller at a place other than the printing area, so that the pressing area of the pressing roller is pressed against the printing area. It is an object of the present invention to provide a printer that can print an image to be printed in a print area with high quality without being marked.

[0010]

As a first solving means for solving the above-mentioned problems, the printer of the present invention comprises a sheet of paper,
A sheet placing section for placing this sheet, a printing unit capable of printing a desired image in a print area of the sheet, and the sheet being pressed against the sheet placing section and conveyed in the conveying direction on the printing unit side. And a sheet feeding means capable of feeding the sheet, and the sheet feeding means presses the sheet between the sheet feeding roller that can be rotationally driven in one direction and the other direction, and presses the sheet. A press roller that can rotate following a paper feed roller, and arranges the paper conveying means between the paper placing portion and the printing means. A blank space having a dimension A is provided up to the first row, which is the first row, and a space between the sheet conveying means and the printing means is a dimension B, and the relationship between the dimension A and the dimension B is B <A. And the paper fed from the paper stacking unit to the paper transport means is Wherein by transporting the dimension B is less than dimension C of the distal portion from the sheet conveying means, said pressure roller on the margin of the dimension A is configured such that position.

As a second solving means for solving the above-mentioned problems, the printing means moves the printing area in the printing line direction of the printing area and can print one line or a plurality of lines simultaneously. The print head has a print width of the dimension D, and the paper fed in the transport direction by the paper transport means has the dimensions A, B, and D.
The sheet is conveyed to the sheet conveying means with a size obtained by adding and, and after the sheet is cueed, the sheet is returned in a direction opposite to the conveying direction, and the leading end portion is moved to the sheet conveying means. From the above, the configuration is such that it is made to stand by at the position where the dimension C has been conveyed.

Further, as a third means for solving the above-mentioned problems, when print data is sent while waiting at the position where the leading end portion of the paper is conveyed by the size C from the paper conveying means, By transporting the dimension E having a value larger than the sum of the dimension A and the dimension D from the position where the sheet is transported by the dimension C in the transport direction, the leading end portion is positioned at the position where the sheet is fed. Then, the first line of the print area is aligned with the print head, and the image is printed from the first line.

Further, as a fourth solution means for solving the above-mentioned problems, the paper is made of roll paper, and from the last line of the print area of the first page of the paper to the print area of the next second page. If the page spacing up to the first line is the size F and the print data of the next second page is not sent when the printing of the first page is completed, the size F and the size D of the paper are changed. The dimension G {G = (F + D) -E} having a value obtained by subtracting the dimension E from the added value is conveyed and stands by, and when the print data of the second page is sent during this waiting, The paper is further conveyed by the dimension E in the conveyance direction, and an image is printed on the print area of the second page.

Further, as a fifth solving means for solving the above-mentioned problems, a paper cutting device capable of cutting the roll paper in the width direction on the downstream side of the printing means in the paper conveying direction. And the distance from the printing means to the paper cutting device is a dimension H, and the paper on which the image is printed on the first page has a margin portion of a size J from the last line of the printing area, When the image printing of the first page is completed, the sheet is conveyed in the conveying direction by a value obtained by adding the dimension D, the dimension H, and the dimension J to the sheet cutting device. The cutting position is aligned, and then the sheet cutting device is driven to cut the sheet of the first page.

As a sixth means for solving the above-mentioned problems, a rear end portion is formed on the sheet of the first page after the cutting, and a rear edge portion is formed on the sheet of the second page. A front end is newly formed, and the front end of the second page is moved to the rear end of the first page by further transferring the second page of the paper to the downstream side of the paper cutting device in the transfer direction. By pressing, the sheet of the first page is ejected.

As a seventh means for solving the above-mentioned problems, after cutting the sheet of the first page, the leading end of the second page is returned to the indexing position,
At this time, if the print data of the second page has been sent, the paper is transported in the transport direction, image printing is performed in the print area of the second page, and the printing of the second page is performed. When the data has not been sent, the paper is returned from the indexing position in the direction opposite to the carrying direction, and the paper is made to stand by at the position where the size C has been carried from the paper carrying means.

As an eighth solution means for solving the above-mentioned problems, a power switch for driving the printing means and the like is provided, and the paper cutting means has an operation switch different from the power switch. Then, when the power switch is input and the paper is present in the paper carrying means, the paper is carried in the carrying direction by a value obtained by adding the size E and the size H, and then the operation switch is operated. Then, the sheet cutting device is driven. 8. The method according to claim 5, wherein

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A printer according to the present invention will be described below with reference to FIG.
Starting from FIG. First, FIG. 1 is a sectional view of an essential part of a printer according to the present invention, FIG. 2 is a perspective view of an essential part of FIG. 1, and FIGS. 3 to 8 are schematic views for explaining the operation of the printer of the present invention.

One of printers using the roll paper of the present invention
The embodiment will be described using, for example, a serial type thermal printer as shown in FIG. 1. In the paper 11 made of roll paper, the roll portion 11a has a paper placement portion 12 on the right side in the drawing.
It is placed in. Further, on the left side of the sheet stacking unit 12 in the drawing, a sheet feed roller 13 which is a sheet conveying unit, and a pressure contact roller 14 which is in pressure contact with the sheet feed roller 13 at a predetermined pressure contact pressure.
And are provided. The paper feed roller 13 can be driven to rotate clockwise or counterclockwise.

Then, the paper feed roller 13 and the pressure contact roller 1
4, the paper 11 is pressed and sandwiched between the paper feeding roller 13 and
When the paper is driven to rotate counterclockwise, the paper 11 is
Can be carried in the carrying direction. Further, when the paper feed roller 13 is driven to rotate in the clockwise direction, the paper 11 can be returned in the direction of the arrow N opposite to the arrow M. Further, a printing unit is provided on the downstream side of the paper feed roller 13 in the transport direction of the arrow M of the paper 11.
A flat and long platen 15 and a print head 16 composed of a thermal head capable of moving in and out (head up / down) of the platen 15 and reciprocating along the platen 15 are provided. There is.

The print head 16 is formed with a plurality of heating elements 16a having a width of dimension D. The heating element 16a formed in the width of the dimension D allows the dimension D
It is possible to print an image of one line of the width of, or a plurality of lines at the same time. When the paper 11 is plain paper, an ink ribbon (not shown) is positioned between the platen 15 and the print head 16 to generate the heating element 16a of the print head 16.
Is moved along the longitudinal direction of the platen 15 while selectively generating heat in accordance with print data sent from a personal computer (not shown) or the like, whereby the ink of the ink ribbon is transferred, as shown in FIG. A desired image can be printed on the print area W of the paper 11.

Further, a paper cutting device 17 capable of cutting the paper 11 into a predetermined length is provided on the downstream side of the print head 16 in the conveying direction of the paper 11 indicated by the arrow M. The sheet cutting device 17 has a fixed blade 18 formed of a long steel plate and formed to be longer than the width of the sheet 11, and the fixed blade 18 conveys the sheet 11 conveyed in the conveying direction of the arrow M.
Is disposed on the upper part of the. A blade tip surface 18a is formed on the left end surface of the fixed blade 18 in the drawing. Further, the fixed blade 18 is provided with a rail member 19 that supports a carriage 24 described later so as to be movable along the fixed blade 18. The rail member 19 includes a carriage 24, which will be described later.
A guide groove 19a that can be engaged with the first engaging portion 24a is formed.

A rotary blade 20 having a sharp blade edge portion on the outer periphery is elastically contacted with the blade edge surface 18a of the fixed blade 18. The rotary blade 20 is screwed to the side surface of a disc-shaped flywheel 21. And flywheel 21
Rubber or the like having a large friction coefficient is attached to the outer peripheral portion of the. Further, the rotary blade 20 and the flywheel 21 are rotatably supported by a carriage 24 made of a resin material. A guide member 25 made of metal is disposed on the right side of the carriage 24 in the drawing, and a groove-shaped second engaging portion 24b with which the guide member 25 can be engaged is formed in the carriage 24.

A paper transport path Y having a predetermined gap is formed between the fixed blade 18 and the guide member 25. In addition, the guide member 25 is formed at a tip end portion that engages with the second engaging portion 24b and is bent downward at a substantially right angle in the drawing so as to be engageable with the second engaging portion 24b. As shown in FIG. 3, the carriage 24 having the rotary blade 20 has a home position X and a movement end position Z at one end and the other end of the fixed blade 18 outside the width L of the sheet 11. In the normal state, the carriage 24 is located at the home position X so that the carriage of the paper 11 in the direction of the arrow M is not hindered.

Carriage 2 from the home position X
The carriage 4 after moving the sheet 4 along the fixed blade 18 in the direction of the arrow R to cut the sheet 11 is positioned at the movement end position Z and then returns to the home position X. Further, at the right end portion of the movement end position Z shown in FIG. 2, a detection member 26 including a switch or the like capable of detecting the carriage 24 located at the movement end position Z.
Is provided.

A belt 28, which is a V-belt, can be attached to the lower portion of the carriage 24. The belt 28 is stretched around a belt drive gear 29 disposed below the sheet cutting device 17, and is a drive source 30 including a motor.
2 is rotated, the belt drive gear 29 gear-connected to the drive source 30 is rotated, and the carriage 24 is moved via the belt 28 along the fixed blade 18 in the directions of arrows R and S as shown in FIG. It is possible to move back and forth. Also, paper 1
As shown in FIG. 2, a paper discharge roller 31 having a knurled outer peripheral portion is disposed on the downstream side of the paper cutting device 17 in the transport direction indicated by arrow M1.

In the first embodiment of the printer of the present invention as described above, as shown in FIG. 3, the paper 11 is desired according to the print data sent from the personal computer or the like on the first page, for example. Print area W where 2 images can be printed
The front end portion 11 of the paper 11 has an area as shown by a dashed line.
A blank area of dimension A is formed between b and the first row W1 that is first printed in the printing area W. The print width dimension of the first row W1 and the print row continuously printed from the first row W1 is the same as the value of the dimension D which is the width dimension of the heating element 16a of the print head 16. In addition, the pressure roller 14 which is a sheet conveying unit.
And the space between the heating element 16a of the print head 16 and the right end of the print head 16 in the drawing is dimension B, and the dimension A and dimension B are arranged so that the relation B <A. .

The operation of the printer according to the first embodiment of the present invention having such a structure will be described. First, the sheet stacking unit 1
The leading end portion 11b of the sheet 11 placed on the sheet 2 is attached to the sheet placing section 1
The sheet is pulled out from the sheet 2, and is sandwiched between the rotary paper feed roller 13 and the pressure contact roller 14 which rotate in the counterclockwise direction and is conveyed in the conveying direction indicated by the arrow M. Then, the paper sheet 11 is conveyed from the pressure contact roller 14 to the leading end portion 11b by the size C smaller than the size B and waits until print data is sent.

The sheet 11 in the standby state has a relation of B <A, and as shown in FIG. 4, the dimension C is from the pressure contact roller 14 to the leading end 11b.
4 is located in the margin portion of the dimension A. Therefore, when the waiting time until the print data is sent becomes long, a concave pressure contact mark 11c of the pressure contact roller 14 is formed in the blank area of the dimension A. Then, when the print data is sent from the external personal computer or the like to the printer that has conveyed the paper 11 by the dimension C and is on standby, the paper feed roller 13 rotates counterclockwise, and as shown in FIG. The tip 11
The position b is conveyed from the position of the size C to the size E, and is located at the position P of the paper cueing.

Then, at the print start position of the paper 11,
The first row W1 of the print area W is aligned with the heating element 16a of the print head 16. Then, the print head 16 prints a desired image in the print area W continuously from the printing of the first row W1. Therefore, even if the pressure contact roller 14 is positioned in the print area W during printing, the pressure contact mark 11c is not formed in the print area W because of a very short time. In the printer according to the first embodiment as described above, since the pressure contact mark 11e of the pressure contact roller 14 is formed in the blank area of the dimension A, the print quality of the image printed in the print area W does not deteriorate and the print quality is high. You can print quality images. Further, the paper 11 used in the printer according to the first embodiment as described above is not limited to roll paper, and may be cut paper such as A4 size. When the cut paper 11 is used, a printer without the paper cutting device 17 may be used.

A description will be given by applying concrete numbers to the respective dimensions of the first embodiment. For example, the dimension A
Is 13 mm, the dimension B is 10 mm, the dimension C is 6 mm, and the dimension D is 10 mm, the dimension E to be conveyed at the time of cueing the sheet is 27 mm. While being performed, the pressure contact roller 14 can be positioned in the margin portion of the dimension A.

Further, as a modification of the first embodiment,
When the front end portion 11b of the paper 11 is sandwiched between the paper feed roller 13 and the pressure contact roller 14, the paper 11 is suddenly moved from the pressure contact roller 14 to the size A without carrying the conveyance of the dimension C.
And the dimension B and the dimension D are combined to convey the sheet, and the sheet is cueed, and then the paper feed roller 13 is rotated in the clockwise direction to move the leading end portion 11b from the pressing roller 14 to the dimension C. It may be returned to and made to stand by. In the printer using the modification of the first embodiment as described above, the print head 16 is provided with the edge detection sensor (not shown) for detecting the left and right edges of the paper 11 in the width direction. As shown in FIG. 5, the print head 16 is reciprocally moved in the width direction of the paper 11 in a head-up state after the paper is fed to detect the positional deviation of the paper 11 in the width direction, and the print area W is printed. It is possible to reduce the deviation in the width direction of the image to be printed on.

In the second embodiment of the present invention, as shown in FIG. 6, continuous paper 11 made of roll paper or the like is used.
For example, after printing an image in the print area W of the first page,
When printing an image in the print area W of the next second page,
The pressure contact roller 14 is located in the margin portion of the dimension F between the print areas W of the first page and the second page so that the pressure contact mark 11c is not formed in the print area W of the second page. The dimension F is a page interval from the last row Wn in the print area W of the first page to the first row W1 of the print area W of the next page, and this portion is a blank portion.

In the printer according to the second embodiment, when the print data of the next second page is not sent at the time when the image printing is finished in the print area W of the first page, From the state shown in FIG. 6, as shown in FIG. 7, the value of the dimension G is conveyed to stand by. The dimension G is obtained by adding the dimension F and the dimension D, which is the width dimension of the heating element 16a, to the dimension E described in the first embodiment.
Is the value obtained by subtracting. That is, G = (F + D) -E
Have a relationship.

When the value obtained by adding the dimension F and the dimension D is larger than the dimension E and the value of the dimension G is positive, the sheet 11 is conveyed in the conveying direction of the arrow M and stands by. . Further, the value obtained by adding the dimension F and the dimension D is the dimension E.
When the size is smaller and the dimension G is negative, the paper 11 is returned in the direction of the arrow N and stands by. In the second embodiment as described above, description will be made by applying specific numbers to the respective dimensions. For example, if the dimension D is 10 mm, the dimension E is 27 mm, and the dimension F is 50 mm, the dimension G is 50 mm + 10 mm-27 mm. = 33m
m, and 33 from the state shown in FIG.
By conveying the sheet by mm, the pressure contact roller 14 is not located in the print area W of the second page. Also,
Among the specific numbers described above, the number of the dimension F is, for example, 1
The dimension G when 0 mm is 10 mm + 10 mm-27
mm = minus 7 mm, which is 7 from the state shown in FIG.
By returning to the direction of the mm arrow N, the pressure contact roller 14 is not located in the print area W of the second page.

In the second embodiment as described above,
Regardless of whether the page interval of the size F of the printing area W of the first page and the page F of the second page is as large as 50 mm or as small as 10 mm, the pressing roller 14 is positioned in the margin of the size F. Can be made. Then, when the print data of the second page is sent while the blank portion of the page interval of the dimension F is positioned on the pressure contact roller 14 and waiting, the value of the dimension E of the paper 11 is further changed in the conveying direction of the arrow M. The image is conveyed and printed from the first row W1 of the second page. Therefore, there is no pressure contact mark 11c in the print area W of the second page, and high quality printing can be performed.

Further, as a third embodiment of the present invention,
When the sheet 11 of the first page on which the image printing is finished is cut using the sheet cutting device 17, the conveyance of the sheet 11 will be described with reference to FIG. The dimension is H. The paper 11 on which the image is printed on the first page is the last line W of the print area W.
It has a blank space of size J from n. When the image printing on the first page is completed, the sheet 1 is changed from the state shown in FIG.
1 is transported in the transport direction indicated by arrow M. This conveyance amount is obtained by conveying the value obtained by adding the dimension D which is the print width of the print head 16, the dimension H, and the dimension J to the paper cutting device 17 so that the rear end planned position 11e of the first page is set. Can be aligned.

Then, by driving the paper cutting device 17, the paper 11 of the first page becomes the paper 11 of the second page.
Is cut off from and disconnected. In the third embodiment as described above, description will be made by applying specific numbers to the respective dimensions. For example, when the dimension D is 10 mm, the dimension H is 22.2 mm, and the dimension J is 10 mm, 10 mm.
+22.2 mm +10 mm = 42.2 mm, and FIG.
When the 42.2 mm paper 11 is conveyed from the state shown in
The expected position 11e of the trailing edge of the first page is the paper cutting device 17
It is designed to be aligned with.

Further, in the third embodiment, the trailing edge portion (not shown) is formed on the sheet 11 of the first page after cutting, and the leading edge of the sheet 11 of the second page is newly added. The part 11b is formed. And the second sheet of paper 11
Is further conveyed to the downstream side of the sheet cutting device 17 in the conveying direction of the arrow M, for example, by 20 mm, so that the front end portion 11b of the second page pushes the rear end portion of the first page to
The sheet 11 of the page can be reliably discharged.

Further, in the third embodiment, after cutting the paper 11 of the first page, the leading end portion 11b of the second page is cut.
Is returned to the indexing position P, and at this time, if the print data for the second page is continuously sent, the paper 11 is transported in the transport direction of the arrow M, and the print area W for the second page is printed. The image of the print data of the page is printed. If the print data for the second page has not been sent, the print position is returned from the indexing position P to the arrow N, which is the direction opposite to the conveying direction of the arrow M, and the dimension C is changed from the pressing roller 14 as shown in FIG. The sheet 11 is made to stand by at the conveyed position.

Further, the paper cutting device 17 is provided with an operation switch (not shown) different from the power switch of the printer, and when the power switch of the printer is input, the paper feed roller 13 and the pressure contact roller 14 are connected. When the paper 11 is detected in the meantime, the paper feed roller 13 is rotated to carry the value obtained by adding the size H to the size E described above in the carrying direction of the arrow M, and then operating the operation switch. The paper cutting device 17 is driven to cut the paper 11. Therefore, even if the power switch is accidentally turned off in the state of FIG. 6 in which printing is completed, the paper cutting device 17 does not operate when the power switch is next input, so the print area W on which the bent image is printed is cut. It is possible to prevent such an obstacle.

[0042]

As described above, in the printer of the present invention, the relationship between the dimension A and the dimension B is B <A, and the paper fed from the paper stacking section to the paper transport means is the paper. Since the pressure contact roller is positioned in the margin portion of the dimension A by transporting the dimension C smaller than the dimension B from the transport means, the pressure contact trace of the pressure roller from the print area is removed. Therefore, it is possible to provide a printer capable of printing a high quality image in the print area.

Further, after the sheet has been cueed, the sheet is returned in the direction opposite to the conveying direction, and the leading end portion is made to stand by at the position conveyed by the dimension C from the sheet conveying means. By detecting the positional deviation in the direction, the deviation in the width direction of the image printed in the print area can be reduced.

Further, when print data is sent while the leading edge of the sheet is conveyed by the sheet conveying means at the position of the dimension C, the value obtained by adding the dimension A and the dimension D from the position at which the sheet is conveyed by the dimension C. By transporting a larger dimension E in the transport direction, the leading end portion is located at the paper cueing position, the leading line of the printing area is aligned with the print head, and the image is printed from the leading line. As a result, it is possible to perform printing from the first line at the same time that the sheet is cueed, it is possible to eliminate printing misalignment in the sheet transport direction, and it is possible to improve printing throughput.

When the print data of the next page is sent while the sheet on which the image printing of the first page has been printed is conveyed by the dimension G and is on standby, the sheet is further conveyed by the dimension E and the sheet is conveyed by the dimension E.
Since the image is printed in the print area of the page, the press roller can be positioned in the margin of the page interval of the dimension F by conveying the sheet by the dimension G and waiting. It is possible to prevent pressure contact marks from being formed in the print area.

When the image printing of the first page is completed, the sheet is conveyed by a value obtained by adding the dimension D, the dimension H, and the dimension J, so that the cutting position of the first page is aligned with the sheet cutting device. Since the sheet cutting device is then driven to cut the sheet of the first page, the printed sheet of the first page can be reliably cut by providing a margin of the dimension J.

Further, after cutting the first page of paper, the second page of paper is further conveyed to the downstream side of the paper cutting device so that the front end of the second page pushes the rear end of the first page. Since I tried to eject the first page of paper,
It is possible to reliably discharge the sheet of the first page after cutting.

After cutting the first page of paper, the leading edge of the second page of paper is returned to the indexing position.
When the print data of the page is not sent, the sheet is returned from the indexing position in the direction opposite to the conveying direction, and the sheet is made to stand by at the position conveyed by the dimension C from the sheet conveying means. It is possible to prevent the press contact mark of the press contact roller from being attached to the print area.

Further, the paper cutting means has an operation switch different from the power switch, and when there is paper in the paper conveying means when the power switch is input, the value obtained by adding the size E and the size H to the paper is used. Is conveyed in the conveying direction, and then the operation switch is operated to drive the paper cutting device, so even if the power switch is accidentally turned off during continuous printing and paper cutting, Next, when the operation switch is not operated when the power switch is input, the paper cutting device does not operate, so that it is possible to prevent a trouble such as cutting the printing area W on which the bent image is printed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a printer according to the present invention.

FIG. 2 is a perspective view of an essential part of FIG.

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

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

FIG. 5 is a schematic side view illustrating the operation of the printer according to the present invention.

FIG. 6 is a schematic side view illustrating the operation of the printer according to the present invention.

FIG. 7 is a schematic side view illustrating the operation of the printer according to the present invention.

FIG. 8 is a schematic side view illustrating the operation of the printer according to the present invention.

FIG. 9 is a schematic side view of a conventionally proposed printer.

[Explanation of symbols]

11 sheets 11b tip 11c Pressure contact mark 13 Paper feed roller 14 Pressure roller 15 Platen 16 print head 16a heating element 17 Paper cutting device 24 carriage P Cue position of paper W printing area W1 first line Wn last line

─────────────────────────────────────────────────── ───Continued from the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65H 35/08 B65H 35/08

Claims (8)

[Claims] 1. A sheet, a sheet placing section for placing the sheet, a printing unit capable of printing a desired image in a printing area of the sheet, and the sheet pressing section to press the sheet from the sheet placing section. And a paper feed unit capable of feeding paper by feeding in the carrying direction on the side of the printing unit. The paper feed unit includes a paper feed roller that is rotationally drivable in both the one direction and the other direction, and between the paper feed roller. While press-contacting the paper, it has a press-contact roller rotatable following the paper-feeding roller, and disposing the paper-transporting means between the paper-placing portion and the printing means,
The sheet has a blank space of dimension A between the leading edge and the first row, which is the first row of the printing area, and the space between the sheet conveying means and the printing means is dimension B, and The relationship between the dimension A and the dimension B is B <A, and the sheet fed from the sheet placing section to the sheet conveying means conveys the dimension C smaller than the dimension B from the sheet conveying means at the leading end. Accordingly, the printer is characterized in that the pressure contact roller is positioned in the margin portion of the dimension A. 2. The printing means is provided with a print head which can move in the print line direction of the print area to print one line or a plurality of lines simultaneously, and the print head has a print width of dimension D. The paper fed in the carrying direction by the paper carrying means has the dimension A, the dimension B, and the dimension D.
The sheet is conveyed to the sheet conveying means with a size obtained by adding and, and after the sheet is cueed, the sheet is returned in a direction opposite to the conveying direction, and the leading end portion is moved to the sheet conveying means. 2. The printer according to claim 1, wherein the printer is made to stand by at a position where the sheet has been conveyed by the dimension C. 3. When print data is sent while the leading edge of the sheet is conveyed by the sheet conveying means at the position where the sheet is conveyed by the dimension C, the sheet moves to the dimension A from the position where the sheet is conveyed by the dimension C. By transporting the dimension E having a value larger than the value obtained by adding the dimension D in the transport direction, the leading end portion is located at the cueing position of the paper, and the leading line of the print area is located at the print head. The printer according to claim 2, wherein the printer is aligned and the image is printed from the first line. 4. The paper is roll paper, and the page interval from the last line of the print area of the first page of the paper to the first line of the print area of the next second page is a dimension F. When the printing data for the second page is not sent when the printing of the second eye is completed, the size G of the paper is a value obtained by subtracting the size E from the value obtained by adding the size F and the size D. When {G = (F + D) -E} is conveyed and stands by, and when the print data of the second page is sent during this stand-by, the sheet is further conveyed by the dimension E in the conveying direction, The printer according to claim 2, wherein an image is printed in the print area of the second page. 5. A paper cutting device capable of cutting the roll paper in the width direction of the paper is disposed downstream of the printing device in the paper transport direction, and extends from the printing device to the paper cutting device. Is set to a dimension H, and the sheet on which the image is printed on the first page has a margin portion of a dimension J from the last line of the print area. When the image printing on the first page is completed, the sheet is printed. By transporting a value obtained by adding the dimension D, the dimension H, and the dimension J in the transport direction, the cutting position of the first page is aligned with the paper cutting device, and then the paper cutting device is driven. 5. The printer according to claim 4, wherein the sheet of the first page is cut by doing so. 6. A rear end portion is formed on the sheet of the first page after the cutting, and a front end portion is newly formed on the sheet of the second page. By further transporting the sheet to the downstream side of the sheet cutting device in the transport direction, the leading edge of the second page pushes the trailing edge of the first page, and the sheet of the first page is discharged. The printer according to claim 5, wherein the printer is configured as described above. 7. After cutting the sheet of the first page, the leading end of the second page is returned to the indexing position,
At this time, if the print data of the second page has been sent, the paper is transported in the transport direction, image printing is performed in the print area of the second page, and the printing of the second page is performed. When the data is not sent, the sheet is returned from the indexing position in the direction opposite to the conveying direction, and the sheet is made to stand by at the position conveyed by the dimension C from the sheet conveying means. The printer according to claim 5 or 6. 8. A power supply switch for driving the printing means and the like is provided, and the paper cutting means has an operation switch different from the power supply switch, and when the power supply switch is input, the paper conveyance means is provided. If the sheet is present, the sheet is conveyed in the conveying direction by a value obtained by adding the dimension E and the dimension H, and then the operation switch is operated to drive the sheet cutting device. The printer according to any one of claims 5 to 7, characterized in that: