JPS63203361A - Printer - Google Patents

Abstract

PURPOSE:To prevent a non-printed part from being generated even when a printing operation is momentarily stopped during printing, by providing a means for momentarily stopping a feeding motor, and a means for momentarily stopping the driving of a printing head after printing. CONSTITUTION:In a routine for feeding a paper by a one-line amount by a feeding motor, it is judged whether an operating mode is a continuous mode. When the operating mode is not the continuous mode, it is judged whether a count on an auxiliary scanning counter is a value indicative of a momentary stop position. When the count is the value indicative of the momentary stop position, data are transferred to data latches and shift registers 67a-67d, then drivers and heads 68a-68d are driven, and the auxiliary scanning counter is incremented by +1. Thus, it is experimentally verified that the delay of the operation of a feeding motor 41 behind the operations of line thermal heads corresponds to two lines, and a two-line amount of data is first printed after momentary stoppage of the feeding motor 41. Therefore, a non-printed part is not generated even when the operations of the heads are stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and particularly to a printing device gW that prints while feeding roll paper.

[Conventional technology]

In conventional printing devices that print while feeding roll paper, there are generally two positions: the print head placement position (hereinafter referred to as the print position) and the placement position of the cutter that cuts the roll paper (hereinafter referred to as the paper cutting position). ), when printing for one page was completed, the roll paper was automatically fed by the distance between the printing position and the paper cutting position, so that the roll paper could be cut. .

[Problem that the invention seeks to solve]

In the conventional printing device described above, when printing for one page is completed, the paper is automatically fed by the distance between the printing position and the paper cutting position. There is a problem in that the roll paper is always added as a non-print part to the beginning of the next page during the next printing, and the roll paper is wasted.

In order to eliminate this wasteful consumption of roll paper, 1.
It may be possible to disable the paper feed that is automatically performed at the end of printing one page, but in this case, the previous print end position of the roll paper will be reflected at the next print. When the paper reaches the paper cutting position, it is necessary to temporarily stop the feeding of the roll paper to perform the paper cut, and then restart the next printing after the paper cut is completed.

However, with conventional printing devices that print while feeding roll paper, the operation of the feed motor, which feeds the roll paper, is slightly delayed compared to the operation of the print head, which prints on the roll paper. This is generally done, and the engagement in which the print head and feed motor are temporarily stopped at the same time during printing is
After the print head stops driving, the roll paper is fed by the feed motor in a non-printing state by the amount of delay, and when printing is restarted, printing continues with the non-printing part left in a line shape. There is a problem of storage.

In view of the above-mentioned points, an object of the present invention is to provide a feed motor temporary stop means for temporarily stopping the feed motor when the previous printing end position of the roll paper reaches the paper cutting position during the current printing; By providing a print head pause means that temporarily stops the print head drive after printing for the number of lines ahead corresponding to the delay of the feed motor after the pause, the print operation is paused in the middle of printing. An object of the present invention is to provide a printing device which does not generate non-printed parts even when printing is performed.

[Means for solving problems]

The printing device of the present invention is a printing device that performs printing by driving a print head while feeding roll paper by a feed motor. feed motor temporary stopping means for temporarily stopping the feed motor at a time when the feed motor is stopped; The print head is characterized by comprising a print head temporary stop means for temporarily stopping the drive.

[Effect]

In the printing apparatus of the present invention, the feed motor temporary stop means temporarily stops the feed motor when the previous printing end position of the roll paper reaches the paper cutting position during the current printing, and the print head temporary stop means stops the feed motor temporarily. After the print head is temporarily stopped, printing is performed for the number of lines ahead corresponding to the delay of the feed motor, and then the drive of the print head is temporarily stopped.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing a printing apparatus according to an embodiment of the present invention. It is connected.

In this printing device, for example, an A4 size document read by a document reading section 2 is enlarged by four times vertically and horizontally in an enlargement print section 1, and printed as an AO size enlarged copy.

The enlarged print section l is mounted on a support frame 4, and its main body consists of a fixed base 5 (see FIG. 3) and a movable lid member 6.
It is housed in a housing consisting of.

As shown in FIG. 3, the fixed base 5 has a platen l whose cross section is shaped like a double peak at the front half position (the right half position in the figure).
O is fixed horizontally in the left-right direction, and a paper roll storage recess 5a for storing a paper roll 50 on which an AO version roll paper 51 is wound is provided at the rear half position.

The platen 10 is a long rod 1 having a cross-sectional shape of a double peak.
1, a platen rubber 12 affixed to the circumferential surface including the double peak position on the upper surface side of the rod 11, and a composite material having an extremely small coefficient of friction affixed to the surfaces of the platen rubber 12 and the rod 11, although not particularly shown. It is composed of a resin coating. In addition, the front end side of the rod 11 is extended as a guide plate part 11a of the 6-ru 51, and the guide plate part 11a
A blade support member 14 made of synthetic resin or the like is embedded in the upper surface of the cutter to receive the blade of a cutter to be described later. In this blade holder, the position of the member 14 is the paper cutting position.

The reason why the platen 10 is formed to have a double-peaked cross-sectional shape is because there is currently no equipment for manufacturing a long roller-shaped platen, and the line thermal head 2
Since the curvature of the portion where 0a to 20d come into pressure contact is specified in advance, it is necessary to include a plurality of peak-like portions that satisfy such curvature, and the feed roller 30a
This is because consideration was given to feeding the paper while bringing the platen 10 into pressure contact with the platen 10.

At both left and right ends of the platen 10, as shown in FIG.
Fixed side plates 13 are each fixedly provided. Fixed side plate 13
A support shaft 16 is implanted near the front end of the outer surface of the cover, and a movable lid member locking lever 15 is rotatably pivoted to this support shaft 16. And this movable lid member locking lever 1
5 is rotated clockwise (in FIG. 4) around a support shaft 16 by a compressible coil spring 17 whose one end is secured to the movable lid member locking lever 15 and the other end is secured to the fixed side plate 13. It is energized as follows. The rotation of the movable lid member locking lever 15 by the coil spring 17 is regulated at a predetermined position by the engagement between the bent piece 15b of the movable lid member locking lever 15 and the opening 13a of the side plate 13. A tip hook portion 15a is formed at the upper end of the movable lid member locking lever 15 and engages with a locking pin 61 implanted on the inner surface of the rotating side plate 52.

As shown in FIG. 3, a paper roll 50 can be removably and rotatably arranged in the paper roll storage section 5a of the fixed base 5. As shown in FIG. The roll paper 51 of the paper roll 50 is made of thermal paper that can be printed by the line thermal heads 20a to 20d.

As shown in FIG. 3, the movable lid member 6 has three parts: a front die-cast part 61, a rear sheet metal part 62, and a front end sheet metal part 63.
It consists of two parts.

In the front die-casting part 61, a roll paper guide part 61a, a line thermal head attachment part 61b, and an urging adjustment means arrangement part 61c are integrally formed in order from the rear side.

The line thermal head mounting portion 61b includes a platen 10.
A plurality of (four in this embodiment) line thermal heads 20a to 20d are attached so as to be in pressure contact with the surface of the double peak position via the AO version roll paper 51.

The line thermal heads 20a to 20d are planar line thermal heads, with half of the line thermal heads 20a and 20C in pressure contact with the rear peak of the platen 10, and the other half of the line thermal heads 20b and 20C.
d are respectively attached to the line thermal head attachment portion 61b so as to be in pressure contact with the front peak portion. As a result, the line thermal heads 20a to 20d are connected to the platen 1.
They are arranged in a staggered manner with different arrangement angles relative to 0.

In this way, a plurality of line thermal heads 20a to 20d
The reason for arranging them in a staggered manner is that there is currently no line thermal head that can print across the entire width of an AO size, and that the line thermal heads 208 to 20d, each having a number of meters, are arranged in a straight line. This is done in consideration of the possibility that there will be areas at both ends of each line thermal head that cannot be printed.

As a result of arranging a plurality of line thermal heads 202 to 20d in a staggered manner at different angles with respect to the platen lO, the timing of providing print tffll information to the line thermal heads 20a and 20G of the preceding phase and the line of the following phase can be changed. It goes without saying that it is necessary to shift the timing of giving print control information to the thermal heads 20b and 20d by the phase difference.
When printing on AO size roll paper 51 based on digital image information read from an A4 size original at a density of 8 dots/mm, the magnification is 400%, so the recording density is 2 dots/mm. It is enough. Note that a line thermal head with a recording density of 8 dots/mm, 12 dots/mm, etc. is used to record one part of digital image information.
Of course, a plurality of dots adjacent to each dot may be driven at a time.

A plurality of (four in this embodiment) feed rollers 30a to 30d are provided in the bias adjustment means arrangement portion 61c of the movable lid member 6 so as to press against the surface of the platen IO via the AO roll paper 51. A biasing adjustment means for biasing is arranged.

The feed rollers 30a to 30d have a configuration in which an elastic body such as rubber is fixed to the circumferential surface of a feed shaft 31, and although the feed shaft 31 is not particularly shown, it is attached to a rotating side plate 52 on the front slope of the platen IO. It is inserted into a pair of left and right oval guide shaft holes that are diagonally bored so as to be substantially perpendicular to each other, and is prevented from being removed by a bushing. The feed shaft 31 is thus arranged slidably within the guide shaft hole.

Further, the feed shaft 31 is biased in a direction in which the feed rollers 30a to 30d come into pressure contact with the platen 1G at multiple locations including both ends by a plurality of bias adjustment means arranged equidistantly in the longitudinal direction of the shaft. ing.

As shown in FIG.
1, a biasing member 33 having a semi-ring shape in cross section;
The main parts thereof include a biasing spring 34 that biases the biasing member 33 in a direction to press against the platen 10, and an adjustment screw 35 that adjusts the biasing force of the biasing spring 34.

A stop hole 33a into which one end of the urging spring 34 is inserted is bored on the rear surface of the urging member 33, and a small-diameter tip of an adjustment screw 35 that passes through the urging spring 34 is inserted into the stop hole 33a. The spring 34 is slightly fitted in to the extent that the parts do not butt each other, thereby preventing the biasing spring 34 from buckling.

The adjustment screw 35 is screwed into a threaded hole carved in a bias adjustment means arrangement portion 61C integrally formed on the inner side wall of the movable lid member 6, and is prevented from loosening by a locking nut 36.

At one end of the feed shaft 31 protruding from the rotating side plate 52,
As shown in FIG. 4, a feed pulley 38 is fixed to the timing belt 39.
and is connected to an output gear 42 attached to an output shaft 41a of a feed motor 41 via a reduction gear mechanism 40.

The tension of the timing belt 39 is adjusted by a tension adjustment mechanism 45, and the tension of the timing belt 39 is adjusted by a tension adjustment mechanism 45.
The hook is passed to the feed pulley 38 via an idle gear 42 that changes the direction of the load applied to the feed pulley 38.

As shown in FIG. 3, a circuit board 45, a transformer 46, etc. are disposed on the rear sheet metal portion 62 of the movable lid member 6.
These are shielded by a decorative plate 47 so as not to be exposed to the outside when the movable lid member 6 is opened.

A recess 64 is formed on the front end surface side of the movable lid member 6, and a cutter 7 is disposed within the recess 64 so as to be slidable in the left-right direction and movable in the vertical direction. When this cutter 7 is pressed from above, the blade (not shown) attached to the lower end of the cutter 7 is inserted into the roll paper 5 corresponding to the member 14.
If the cutter 7 is slid in the horizontal direction at this position, the roll paper 51 will be cut at the paper cutting position + 71 strokes ^I gusset? -pu IX2 The fixed base 5 and the movable lid member 6 are, as shown in FIG.
A rotating side plate 52 is fixed to both sides of the inner surface of the movable lid member 6 to a rotating support shaft 18 that is pivotally supported near the rear end of the fixed side plate 13.
are rotatably attached and connected to each other.

As shown in FIG. 4, on the fixed plate 19 that is raised up after being extended left and right from the fixed side plate 13, there is a pin 2 near the front end that engages one end of a compressible energizing coil spring 21.
2 is implanted, and an arc-shaped cam member 2 is installed in the middle.
A cam pin 24 is implanted to be inserted into the long cam hole 23a of No. 3. The other end of the biasing coil spring 21 is engaged with a pin 25 embedded in the free end of the arc-shaped cam member 23. The base end of the 0-circular cam member 230 is embedded in the rotating side plate 52. The cam elongated hole 23a of the zero-arc-shaped cam member 23, which is swingably attached to the support shaft 26, has an intermediate step portion 23b formed near the base end, and an intermediate step portion 23b formed on the free end side. A tip step portion 23C is included.

On the movable lid member 6, as shown in FIG. 2, an operation panel 70 for the enlarged print section 1 is provided.

On the operation panel 70, as shown in an enlarged view in FIG. 5, there is a mode change switch 71. FEED switch 72° stop (
STOP) switch 73 and START
A switch 74 is provided respectively. Further, light emitting diodes 758 to 75f are provided, respectively, for displaying a power-on state, an error state, a temporary stop state for cutting the roll paper, and the like.

The mode changeover switch 71 has two modes: a 1-copy pause mode in which the page is paused to cant the blank space at the top of the page during printing, and the paper is automatically fed from the printing position to the paper cutting position at the end of printing; One copy continuous mode automatically feeds the paper from the printing position to the paper cutting position at the end of printing without pausing to cut the blank area at the top of the page, and the other mode automatically feeds the paper from the printing position to the paper cutting position without pausing to cut the blank area at the top of the page while printing. A multi-copy pause mode that pauses to cut continuous copies and does not feed the paper from the print position to the paper cutting position when printing is finished, and a multi-copy pause mode that pauses to cut continuous copies and does not feed the paper from the print position to the paper cutting position when printing is finished, and Either one of the multiple copy one continuous mode that does not pause and does not feed the paper from the print position to the paper cutting position when printing is completed.
This is an operating member for selecting one mode.

Hereinafter, the one copy one continuous mode and the multiple copy one continuous mode will be collectively referred to as continuous mode, and the one copy one continuous mode and one copy pause mode will be collectively referred to as one copy mode.

When the mode changeover switch 71 is pressed down, the light emitting diodes 750 to 75f turn on cyclically in sequence, and the modes are selected: 1 copy pause mode, 1 copy one continuous mode, multiple copy pause mode, and multiple copy one continuous mode. They are selected sequentially and cyclically.

Mode selection switch 71. The feed switch 72, the stop switch 73 and the start switch 74 are
As shown in the figure, each central processing unit (CPU)
69. Also, although not particularly shown,
The drive circuit for the light emitting diodes 75a to 75f is also run by the CPU 69.
It is connected to the.

The CPU 69 further includes an image reading section 2. Page memory 65. Clock generation circuit 66 and feed morph 41
are connected to each data latch and shift register 67a to 67d of each line thermal head 208 to 20d.
Shift registers 67a to 67d correspond to respective drivers and heads 68a to 68d of each line thermal heads 20a to 20d.
are connected to each.

Referring to FIG. 7, in the printing apparatus of this embodiment, the main routine processing related to the mode changeover switch 71 and the start switch 74 includes a print mode change determination step 81, a copy pause mode determination step 82, 1 Copy one continuous mode setting step 83;
1 copy, 1 continuous mode determination step 84, multiple copy temporary stop mode setting step 85, multiple copy temporary stop mode determination step 86, multiple copy 1 continuous mode setting step 87, 1 copy temporary stop mode setting step 88, A print start determination step 89, a print initialization step 91, a data transfer step 92 to the data run mill shift register, a driver and head drive step 93, a sub-scanning counter increment step 94, a feed motor one line feed routine 95, The process consists of an end determination step 96, an l copy mode determination step 97, and a paper feed step 98.

Referring to FIG. 8, the processing in the feed motor one line feed routine 95 includes continuous mode determination step 10.
1, a temporary stop position detection step 102, a data transfer step 103 to the data latch & shift register,
Driver & Head Driving Step 104, Sub-scanning Counter Increment Step 105, Data Latch & Data Transfer to Shift Register Step 106, Driver & Head Driving Step 107, Sub-scanning Counter Incrementing Step 108, and Print Resumption Judgment Step 109 and feed motor 1 line feed step 11
Consists of 0.

On the other hand, as shown in FIG. 1, the image reading section 2 opens the lid member 2a, places the original on a document table (not shown), closes the lid member 2a again, and turns on the reading switch 2b. When pressed, the image of the document is read as digital image information by a built-in line image sensor (not shown). The image reading section 2 is capable of transferring the read digital image information to the enlarged print section l via the cable 3.

Next, the operation of the printing apparatus of this embodiment configured as described above will be explained.

First, to set the roll paper 51 in the enlarged print section l, take the movable lid member locking lever 15 that protrudes from the lower side of the fixed base 5 and move it toward you (counterclockwise in FIG. 4). Rotate. Then, the tip hook portion 15a of the movable lid member locking lever 15 disengages from the locking pin 61, and the free end of the arc-shaped cam member 23 is pulled by the elasticity of the biasing coil spring 21, and the cam elongated hole is pulled. 23a and the cam pin 24, the movable lid member 6 rotates counterclockwise (in FIG. 4) about the rotation support shaft 18. Then, the cam pin 24 is engaged with the intermediate step portion 23b of the cam elongated hole 23a, and the movable lid member 6 is temporarily locked in the half-open position shown by the two dotted lines in FIG.

If you place your hand on the movable lid member 6 from the half-open state of the movable lid member 6 and pull the movable lid member 6 toward you, the cam pin 2
4 climbs over the intermediate step 23h of the cam elongated hole 23a and finally enters the tip step 23e of the cam elongated hole 23a, and the movable lid member 6 is temporarily in the fully open position shown by the solid line in FIG. It will be locked in.

At the fully open position of the movable lid member 6, the line thermal heads 20a to 20d and the feed rollers 308 to 3Qd
The user stores the paper roll 50 in the paper roll storage section 5a, pulls out the tip of the roll paper 51 from the paper roll 50, spreads it out along the platen 10, and moves it to the front side. It can be pulled out. By doing so, the roll paper 51 can be placed in the enlarged print section l.

In addition, when the movable lid member 6 is in the fully open position, the line thermal heads 208 to 20d, the feed rollers 30a to 30d,
Since the platen 10 and the like are exposed to the outside, maintenance such as repair and replacement can be easily performed. Furthermore, by removing the decorative board 47, maintenance of the circuit board 45 and the like can be easily performed.

When the front side of the movable lid member 6 is pressed from above in a state in which the roll paper 510 can be set, the movable lid member 6 resists the elasticity of the biasing coil spring 21 via the arcuate cam member 23 and rotates around the pivot shaft 18. It is rotated clockwise in FIG. Then, the movable lid member locking lever 15 is slightly rotated counterclockwise so that the locking pin 61 installed on the rotating side plate 52 gets over the tip hook portion 15a of the movable lid member locking lever 15. Coil spring 1 of movable lid member locking lever 15
7 in the clockwise direction, the locking pin 61 is locked, and the movable lid member 6 is locked in the closed position. As a result, the line thermal heads 20a to 20d and the feed rollers 30a to 30d are brought into pressure contact with the platen lO via the roll paper 51, and the roll paper 51 is set in the enlarged print section l.

When the power is turned on to the enlarged print section 1, the main routine shown in FIG. 7 is started. In the main routine, first, it is determined whether or not the mode changeover switch 71 has been pressed down to instruct a change in print mode (step 81). If the mode changeover switch 71 has not been pressed down, the process moves to step 89. . When the mode changeover switch 71 is pressed down, it is then determined whether or not the mode is currently in the 1-copy pause mode (step 82
), 1 If copy pause mode, set the mode to 1.
If the mode is set to one copy continuous mode and the process goes to step 89 (step 83), if it is not one copy pause mode,
It is determined whether or not the current mode is 1 copy, 1 continuous mode (step 84). If it is 1 copy, 1 continuous mode, the mode is set to multi-copy pause mode and the process proceeds to step 89 (step 85). If it is not the 1 copy, 1 continuous mode, it is determined whether the current mode is the multiple copy pause mode (step 86); if it is the multiple copy pause mode, the mode is set to the multiple copy, 1 continuous mode. If the mode is not multi-copy pause mode, the process proceeds to step 89 (step 88).
), in step 89, it is watched whether or not the start switch 74 is pressed to instruct to start printing, and as long as the start switch 74 is not pressed, the process returns to step 81.

Next, when the cover member 2a of the document reading section 2 is opened, the document is set on the document table, the cover member 2a is closed again, and the reading switch 2b is pressed down, the line image sensor built in the document reading section 2 scans the original and transfers the digital image information of the original to the enlarged print section 1 via the cable 3.

In the enlarged print section 1, the CPU 69 operates as the original reading section 2.
The digital image information transferred from the page memory 65 is temporarily stored and held in the page memory 65.

When the start switch 74 is pressed with the roll paper 51 set in the enlarged print section 1 and the digital image information of the document stored in the page memory 65, the determination in step 89 of the main routine shown in FIG. 7 becomes YES. , the print operation is started.

First, initialization processing such as zero clearing of the sub-scanning counter is performed (step 91), and then the page memory 65
1 to data latch & shift registers 67a to 67d
The data for the line is transferred (step 92), and the drivers and healds 683 to 68d are driven (step 9
3) It goes without saying that the phase difference based on the difference in the arrangement positions of the line thermal heads 20a to 20d in the sub-scanning direction is taken into consideration.

Subsequently, the sub-scanning counter is incremented by +1 (step 94), and the feed motor one line feed routine 95 is activated.

In the feed motor line feed routine 95, it is first determined whether or not the mode is continuous mode (step 101).
If the mode is continuous mode, the process jumps to step 110. If the mode is not continuous mode, it is determined whether the count of the sub-scanning counter is a value indicating a pause position (step 102).
, if the value does not indicate a temporary stop position, the process jumps to step 110. If the value indicates a temporary stop position, the data is transferred to the data latch & shift registers 67a-67d (step 103), and the data is transferred to the driver & heads 68a-68d.
is driven (step 104), and the sub-scanning counter increases by +1.
is incremented (step 105), and the same processing as steps 103 to 105 (steps 106 to 105) is performed.
After step 108) is repeated, it is monitored whether printing is restarted by pressing the start switch 74 (step 109).

In this way, in the printing apparatus of this embodiment, after experimentally verifying that the operation delay of the feed motor 41 with respect to the line thermal heads 208 to 20d is equivalent to two lines, I am trying to print the data for 1 minute in advance. In addition, the experimentally verified Line Thermal Herad 20a~
If the delay in the operation of the feed motor 41 with respect to 20d is other than two lines, data for the corresponding number of lines may be printed in advance after the feed motor 41 is temporarily stopped.

When the start switch 74 is pressed while in the watching state for restarting printing, the feed motor 41 is driven by one line in step 110. When the feed motor 41 rotates, the output shaft 41a and the output gear 42
．． Reduction gear mechanism 40. The feed shaft 31 is rotated via the timing belt 39 and the feed pulley 38.

As a result, the feed rollers 308 to 30d rotate and the roll paper 51 is fed.

Then, the processing of the feed motor one line feed routine 95 is completed, and the process returns to the main routine.

In the main routine, when the control returns from the feed motor 1 line feed routine 95, it is determined whether the printing operation has ended by checking the value of the sub-scanning counter (step 96).If the printing operation has not ended, step The process returns to step 92 and repeats the process.

Then, when the digital image information for one page in the page memory 65 has been printed, it is determined whether or not the copy mode is selected (step 97). If there is one copy mode, the feed motor 41 is further activated. After feeding the roll paper 51 to the paper cutting position by driving, step 81
Returns to step 9B (step 9B), and immediately returns to step 81 if the mode is not 1 copy mode.

If you wish to stop the printing operation in the middle of printing one page of digital image information, press the stop switch 73 and the feed motor 4 will stop at that point.
1 and the driving of the line thermal radars 20a to 20d is stopped.

Further, when it is desired to feed only the roll paper 51 without printing, if the feed switch 72 is pressed down, the feed motor 41 is rotated and the roll paper 51 is fed only while the depression operation continues.

By the way, in order for the line thermal heads 20a to 20d to print on the roll paper 51, it is necessary to maintain a contact pressure equal to or higher than a predetermined contact pressure.
In order for the feed rollers 30a to 30d to feed the roll paper 51, it is necessary to apply a frictional force to the roll paper 51 that is greater than the above contact pressure.
The contact pressure against the platen 1G also needs to be greater than a predetermined contact pressure. Thereby, the feed shaft 31 becomes more easily bent and curved.

Therefore, due to the curvature of the feed shaft 31, the feed rollers 30a to 30d near the center do not come into contact with the roll paper 51 with a contact pressure greater than the contact pressure required for feeding the roll paper 51, and the feed rollers 30a to 30d near both ends of the feed rollers 30a to 30d If the feeding speed of the roll paper 51 is uneven in/around the center, the roll paper 51 may jam, wrinkle, or be fed diagonally, preventing normal printing. In such a case, the biasing force applied by the biasing spring 34 to the feed shaft 31 can be adjusted by removing the front end plate 63 of the movable lid member 6 and rotating the locking nut 36 from the outside. The feed rollers 30a to 30d can be pressed against the platen 10 evenly in the axial direction. In this way, the contact pressure for feeding the roll paper 51 becomes uniform in the line direction, which prevents the roll paper 51 from jamming, wrinkling, or being fed diagonally, thereby ensuring normal operation. You can now print.

Note that the biasing spring 34 is applied to the feed rows 530a to 30d.
If it comes into too much pressure contact with the platen 10, the load on the feed motor 41 will increase and the roll paper 51 will no longer be fed, so it also serves to buffer against such too much pressure contact. Further, the biasing spring 34 is connected to the feed rollers 308 to 30
When d is formed eccentrically to the feed shaft 31,
It also serves to absorb fluctuations in contact pressure due to eccentricity.

Incidentally, in the above embodiment, the printing apparatus is an enlarged copying machine, but the present invention is not limited to this; the present invention is applicable to all printing apparatuses that perform printing while feeding roll paper.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a feed motor temporary stop means for temporarily stopping the feed motor when the previous printing end position of the roll paper reaches the paper cutting position during the current printing; By providing a print head temporary stop means that temporarily stops the print head drive after printing for the number of lines ahead corresponding to the delay of the feed motor after the temporary stop, the feed motor and print head are stopped during printing. Even when the head is stopped, good printing results can be obtained without producing non-printed areas.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part showing an open state of a movable lid member in a printing device according to an embodiment of the present invention, and FIG. 2 is a main part showing an enlarged printing section of the printing device shown in FIG. 1. Fig. 3 is a sectional view showing the internal structure of the enlarged print section shown in Fig. 2, Fig. 4 is a side view of the main parts of the enlarged print section shown in Fig. 2, and Fig. 5 is a fragmented plan view. , a plan view showing an enlarged view of the scanning panel shown in FIG. , a flowchart showing the main routine processing in the enlarged print unit shown in FIG. 2, and FIG. 8 a flowchart showing more detailed processing of the feed motor one line feeding routine shown in FIG. In the figure, 1...Enlarged print section, 2...Document reading section, 3...Cable, 4...Support frame, 5...Fixed base, 6...Movable lid member, 7...Cutter, IO...Platen, 13...Fixed side plate, 15...Movable lid member locking lever, 18...・・・・・・
Rotation support shaft, 19... fixed plate, 20a to 20d, line thermal head, 21...
- Biasing coil spring, 23... Arc-shaped cam member, 23a... Cam long hole, 24... Cam pin, 26... Support shaft, 30a to 30d, 7 Eid roller, 31...
...Feed shaft, 38...Feed pulley, 41...Feed motor, 50...Paper roll, 51...Roll paper, 61...Locking bin , 65...Page memory, 69...CPU. 71...Mode selection switch, 72...Feed switch, 73...Stop switch, 74...Start switch.

Claims (1)

[Scope of Claims] In a printing device that drives a print head to perform printing while feeding a roll paper by a feed motor, the previous printing end position of the roll paper reaches a paper cutting position during the current printing. feed motor temporary stopping means for temporarily stopping the feed motor at a point in time; A printing apparatus comprising: a print head temporary stop means for stopping the print head.