JPH0363148A - Printing method - Google Patents

Abstract

PURPOSE:To prevent the displacement of the movement of printing paper shifted by revolution in the direction reverse to the forward direction of a driving roller, and to obviate the generation of printing displacement by conducting a plurality of printing under the state in which printing paper on the paper-feed original side is sagged at all times. CONSTITUTION:A second driving motor 12 is driven and a paper roller 2 is turned forward after alignment, and printing paper 1 corresponding to a specified printing region between the paper roller 2 and a first guide roller 15 is sagged. A first driving motor 9 is driven and a driving roller 4 is rotated in the forward direction, and printing paper 1 is moved from the paper feed original side to the paper-feed destination side. The driving roller 4 is stopped temporarily and printing paper 1 is rested on its midway of the movement, and the printing of heat transfer is conducted in specified line number. When first printing is completed, a thermal head 8 is retreated, the first driving motor 9 is driven and the driving roller 4 is revolved in the opposite direction, and printing paper 1 is shifted from the paper-feed destination side to the paper-feed original side. Accordingly, the generation of positional displacement at the time of feeding and time of return of printing paper can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing method in a printing device, such as a thermal transfer plotter for color printing, which prints multiple times on a predetermined location (for example, the same portion) on a printing paper. It is.

[Prior Art] Conventionally, this type of printing method has been carried out as shown in FIG. 8 or 9. In the case shown in FIG. 8, from paper roller 2 on the paper feed source side to paper roller 3 on the paper feed destination side.
In the middle of the printing paper being sent to the yellow printing section 20,
A magenta printing section 30, a cyan printing section 40, and a black printing section 50 are provided, and each printing section 20, 30, 40, 50
to print in a predetermined color at a predetermined location on printing paper 1,
The printing units 20, 30, 40, 50 are fed in synchronization with the printing paper 1 by drive rollers 24, 34, 44, 54, ink ribbon rollers 25, 26.35, 36.45, 46.55, and 56, respectively. an ink ribbon 27, 37, 47, 57 of a predetermined color, and a thermal head 28, 38.
．． 48.58. In addition, in the printer shown in FIG. 9, there are two drive rollers 4, one thermal head 8, and an ink cartridge in the middle of the printing paper 1 being sent from the paper roller 2 on the paper feed source side to the paper roller 3 on the paper destination side. An ink ribbon 7 is provided which is sent in the forward direction shown by the dashed line in synchronization with the printing paper l by ribbon rollers 5 and 6.
The drive roller 4 is rotated alternately in the forward direction shown by the dashed-dot line and in the reverse direction shown by the dashed-dotted line to reciprocate the printing paper 1 with respect to the thermal head 8 four times, and the ink ribbon 7 is switched to one of a predetermined color. At the same time, printing is performed four times in a predetermined color at a predetermined location on the printing paper 1.

The operation of switching the ink ribbon 7 to a predetermined color and supplying it between the drive roller 4 and the thermal head 8 is performed by a well-known ribbon switching mechanism (not shown).

[Problems to be Solved by the Invention] However, in the conventional method shown in FIG. 8, four drive rollers 24, 34, 44, 54 and four thermal heads 28, 38, 48, 58 are required. There was a problem that the structure of the device became complicated. In the conventional method shown in FIG. 9, the structure of the device is simple, requiring only one drive roller 4 and one thermal head 8, but the printing paper
Since the printing paper has to be moved back and forth four times with respect to the thermal head 8, there is a problem in that the printing paper slips or sag during this reciprocation, which tends to shift the printing position and cause color misregistration.

The present invention was made in view of the above-mentioned problems, and is a printing device that requires only one drive roller and one print head, and performs multiple prints by reciprocating print paper with respect to the print head multiple times. It is an object of the present invention to provide a printing method that does not cause printing misalignment that causes misalignment.

[Means for Solving the Problems] The printing method according to the present invention moves the printing paper pulled out from the paper roller from the paper feed source side to the paper feed destination side by rotating the drive roller in the forward direction, and the drive roller The printing paper is moved back and forth with respect to the print head a plurality of times by rotating the rollers alternately in a forward direction and a reverse direction, and the driving roller is temporarily stopped during this back and forth movement.

In a printing device that performs printing multiple times by pressing the print head via an ink ribbon onto the print paper located on the surface of the drive roller, there is a space between the drive roller and the paper feed source side of the drive roller. A first guide roller is provided to sandwich the print paper, and a second guide is provided on the paper sending destination side of the drive roller to press the print paper against the drive roller and move the print paper in a predetermined direction by rotation of the drive roller. A roller is provided, and the plurality of printings performed by rotating the driving roller alternately in forward and reverse directions are performed with the printing paper between the paper roller and the first guide roller slackened. It is characterized by:

In order to move the printing paper without causing any slack on the drive roller, the frictional force that the first guide roller applies to the printing paper is approximately the same as the frictional force that the second guide roller applies to the printing paper. Configure it so that

Alternatively, the rotating shaft of the drive roller and the first. In order to prevent the rotational axis of the second guide roller from becoming non-parallel and causing positional deviation between the feeding and returning of the printing paper, the frictional force that the first guide roller applies to the printing paper is as follows: The second guide roller is configured to be negligibly small compared to the frictional force applied to the printing paper.

[Action Co. By rotating the drive roller in the forward direction.

The printing paper pulled out from the paper roller is moved from the paper feed source side to the paper feed destination side by a drive roller and first and second guide rollers, and printing is performed by rotating the drive roller alternately in the forward direction and reverse direction. The paper is moved back and forth against the print head multiple times, the drive roller is temporarily stopped during this reciprocation, and the print head is pressed multiple times via the ink ribbon onto the print paper located on the surface of the drive roller. is printed. This multiple printing.

This is done with the printing paper between the paper roller and the first guide roller slackened, that is, with the printing paper on the paper feed source side always slackened, so it moves by the rotation of the drive roller in the forward and reverse directions. There is no deviation in the amount of movement of the printing paper, and no printing deviation occurs.

When the first and second guide rollers apply substantially the same frictional force to the printing paper and the printing paper is moved in a predetermined direction by the rotation of the drive roller,
Since the printing paper can be moved by pressing the printing paper against the driving roller on both the paper sending source side and the paper sending destination side of the driving roller, the printing paper can be moved without causing the printing paper to float on the driving roller. Furthermore, the frictional force that the first guide roller applies to the printing paper is made so small that it can be ignored compared to the frictional force that the second guide roller applies to the printing paper, and the first guide roller is moved in the direction of movement of the printing paper. If the second guide roller is configured to contribute to regulating the moving direction of the printing paper without contributing to regulating the printing paper, the central axis of rotation of the drive roller and the central axis of rotation of the guide roller will become non-parallel. Also, it is possible to prevent positional deviations from occurring when printing paper is fed and returned.

[Embodiment] FIGS. 1 and 2 show an embodiment of the printing method according to the present invention. In these figures, the same parts as in FIG. 9 are given the same reference numerals.

In FIGS. 1 and 2, 1 is a printing paper, and 4 is a driving roller. 9 is a first drive motor, and this first drive motor 9 transmits rotation and torque to the drive roller 4 via a toothed belt IO and a gear 11, and drives the drive roller 4 as indicated by the solid line arrow in FIG. It is configured to be able to rotate in the forward direction (counterclockwise direction, hereinafter the same shall apply) as shown by and in the reverse direction (clockwise direction, hereinafter the same shall apply) as shown by the solid line arrow in FIG. , 12 is a second drive motor, and this second drive motor 12 transmits rotation and torque to the paper roller 2 via a toothed belt 13 and a gear 14.
The paper roller 2 is configured to be able to rotate in the forward direction shown by the solid line arrow in FIG. 1 and in the opposite direction. Reference numerals 15 and 16 refer to first and second rollers which are provided so as to press the drive roller 4 on the paper feed source side and the paper feed destination side of the drive roller 4, and whose one rotation center axis is parallel to the rotation center axis of the drive roller 4. 2 guide rollers. Said first
, the second guide rollers 15 and 16 rotate following the drive roller 4, guide the printing paper 1 pulled out from the paper roller 2 in a predetermined direction, and move it in a predetermined direction by frictional force. It is configured. , that is,
The printing paper 1 pulled out from the paper roller 2 is wound around the surface of the driving roller 4 so as to face the thermal head 8 as a printing head, and the printing paper 1 is pulled out by forward or reverse rotation of the driving roller 4. It is configured to guide and move the paper from the paper feed source side to the paper feed destination side or vice versa. To be more specific, during forward rotation, the first guide roller 15 guides the printing paper (2) pulled out from the paper roller 2 to the surface of the drive roller 4 while pressing it against the surface of the drive roller 4;
The second guide roller 16 guides the printing paper l to the surface of the ll@l Nichido roller 4 and presses the moved printing paper l against the surface of the drive roller 4 to release the paper. Guide and move to the destination side. During reverse rotation, the effect is opposite to that described above. An ink ribbon 7 is provided between the drive roller 4 and the thermal head 8 and is supplied with a predetermined color sequentially switched by a well-known ribbon switching mechanism (not shown). and 6, it is synchronized with the printing paper ■ and is fed in the forward direction shown by the solid line arrow in FIG.
During printing, it is configured to stop in synchronization with the printing paper 1, and to be pressed by the thermal head 8 against the printing paper 1 and the drive roller 4 with a predetermined pressing force.

Next, a printing method using the printing apparatus shown in FIGS. 1 and 2 will be described.

(b) After aligning the position i1, as shown in FIG. slacken printing paper 1.

(b) Next, as shown in FIG.
to rotate the drive roller 4 in the forward direction.

The printing paper 1 is moved from the paper feed source side to the paper feed destination side. During this movement, the drive roller 4 is temporarily stopped to make the printing paper 1 stand still, and the thermal head 8 is driven to thermally transfer a predetermined ink from the ink ribbon 7 onto the printing paper 1 for a predetermined number of digits. It will be done. Printing on any row is performed with the printing paper between the paper roller 2 and the second guide roller 15 being slack. Therefore, when the first printing of the bone in the predetermined printing area of the printing paper 1 is completed, the printing paper 1 is slack (for example, it is slack as shown by the dashed line in FIG. 1).

(c) After the first printing is completed in (b) above, the second
As shown in the figure, first, the thermal head 8 is retracted, and then the eleventh drive motor 9 is driven to rotate the drive roller 4 in the opposite direction, and the printing paper 1 is moved from the paper feed destination side to the paper feed source side. The ribbon switching mechanism switches the ink ribbon 7 to a predetermined color and returns the thermal head 8 to the same state as in FIG.

(d) Thereafter, by repeating the operations (b) and (c) above a predetermined number of times while exchanging the ink ribbon 7, predetermined color printing is performed.

After the color printing of the predetermined printing area bone of the printing paper 1 is performed according to (a) to (d) above, the first. By driving the second sleep motor 9.12, a predetermined amount of printing paper 1 is moved from the paper feed source side to the paper feed destination side, and waits for printing in the next printing area.

In the above embodiment, in order to remove unnecessary slack in the printing paper and to control the amount of movement of the printing paper in the forward and reverse directions,
Although the drive motor is configured to be able to rotate the paper roller in the forward direction and the reverse direction, the present invention is not limited to this.
Any method may be used as long as it removes unnecessary slack from the printing paper and controls the amount of movement of the printing paper. For example, as shown in FIGS. 3 and 4, a one-way clutch 17a, a spring 1
7b and bobbins 17c, 17c, and the second drive motor 12 is configured to rotate the paper roller 2 only in the reverse direction but not in the forward direction. A tension force in the opposite direction may be applied to the printing paper (when moving in the direction).

The one-way latch L7a is configured to not transmit the power to the rotation center shaft 2a of the paper roller 2 when the gear 14 rotates in the forward direction, but to transmit the power only when the gear 14 rotates in the reverse direction. has been done.

The printing method using the printing device shown in FIGS. 3 and 4 is as follows:
It is done as follows.

(a) When the printing paper 1 is moved, the printing paper 1 is controlled to move by a predetermined amount without causing unnecessary slack in the printing paper 1. That is, by driving the 111u moving motor 9 and/or the 21st @ moving motor 12 to transmit a predetermined rotation and torque to the drive roller 4 and/or paper roller 2,
As shown by the solid line in Figure 3.

When the drive roller 4 is rotated in the forward direction to move the print paper 1 from the paper feed source side to the paper feed destination side, a tension force (so-called bank tension) T1 in the opposite direction is applied to the print paper due to the resistance of the paper roller 2. However, the printing paper 1 is controlled to move by a predetermined amount without causing unnecessary slack in the printing paper 1. When the printing paper 1 is moved, the thermal head 8 is placed in a retracted state.

(b) When printing on the printing paper 1, after aligning the printing paper 1 in the state shown by the solid line in Fig. 3, first,
The first drive motor 9 is driven to rotate the drive roller 4 in the opposite direction, and as shown in FIG. In step 6, the first printing is performed with the printing paper 1 always slackened, and when the first printing is completed, the drive roller 4 is turned off. It rotates in the opposite direction and returns to the state shown by the dashed line in Fig. 3. During printing, the thermal head 8 presses the printing paper 1 on the opening roller 4 via the ink ribbon 7, and when returning, the thermal head 8 presses the printing paper 1 on the opening roller 4. You will be placed in a state of evacuation.

(c) Thereafter, by repeating the operation in (b) a predetermined number of times while exchanging the ink ribbon 7, predetermined color printing is performed.

In the embodiment described above, in order to remove unnecessary slack in the printing paper and to control the amount of movement of the printing paper, a second motor for rotating the paper roller is provided.
The present invention is not limited to this, and unnecessary slack in the print paper may be removed and the amount of movement of the print paper may be controlled without providing the second rotation motor. For example, as shown in FIGS. 5 and 6, the rotation center shaft 2 of the paper roller 2
A back tension applying mechanism 1 consisting of a spring 19a and bobbins 19b, 19b is disposed between
9 may be provided so that tension in the opposite direction due to a slip action is applied to the printing paper 1 when the printing paper 1 moves in the forward direction except during printing. Next, a printing method using a printing device in which the paper roller 2 is provided with a pack tension applying mechanism 19 as shown in FIG. 6 will be described.

(2) When moving on the printing paper, the printing paper 1 is controlled to move by a predetermined amount without causing unnecessary slack. That is, the first drive motor 9 is opened to transmit a predetermined rotation and torque to the drive roller 4, and the opening roller 4 is rotated in the forward direction as shown by the solid line in FIG. When attempting to move the paper from the paper feed source side to the paper feed destination side, the pack tension applying mechanism 19 applies tension (so-called back tension) T to the printing paper 1 in the opposite direction.
2 acts, and the printing paper l is controlled to move by a predetermined amount without causing unnecessary slack. This printing paper 1
When moving, the ink ribbon 7 and the thermal head 8
will be placed in a evacuated state.

- When printing on the printing paper, after aligning the printing paper 1 in the state shown in FIG. 5(a).

As shown in FIG. 2B, the first operating motor 9 is driven to rotate the opening roller 4 in the opposite direction, and a predetermined printing area of printing paper l is placed between the paper roller 2 and the second guide roller 15. slacken.

■Then, in the same way as explained in (b) above, that is,
As shown in FIGS. 5(c) and 5(d), the thermal head 8 presses the printing paper 1 on the drive roller 4 via the ink ribbon 7, with the printing paper l always slackened, so that the first Perform the second printing.

When this first printing is completed, the state will be as shown in FIG. 5(e).

Next, as shown in FIG. 5(f), the thermal head 8 and the ink ribbon 7 are retracted, and the opening roller 4 is rotated in the opposite direction to create a predetermined printing area between the paper roller 2 and the second guide roller 15. The printing paper 1 is slackened to wait for the second printing.

(2) Thereafter, by repeating the above-mentioned operation (2) a predetermined number of times while exchanging the ink ribbon 7, predetermined color printing is performed.

In the embodiment described above, the first and second guide rollers press the printing paper against the surface of the drive roller on the paper feed source side and the paper paper feed destination side of the opening roller, respectively, and apply approximately the same frictional force to the printing paper. Although the present invention is configured such that the printing paper is moved in a predetermined direction by the rotation of the drive roller so that the printing paper does not float on the opening roller, the present invention is not limited to this, and at least the first guide roller The second guide roller guides the printing paper by sandwiching the printing paper between it and the driving roller on the paper feeding source side of the opening roller, and the second guide roller presses the printing paper against the surface of the driving roller on the paper feeding destination side of the driving roller to guide the printing paper. Any device may be used as long as it applies a predetermined frictional force to the opening roller and moves the printing paper in a predetermined direction by rotation of the opening roller. For example, as shown in FIG. 7, the first guide roller 15A is
It is made of a material with good slippage such as aluminum, or is made of a low friction material such as having its surface treated with resin, and serves to guide the printing paper 1 by sandwiching it between the drive roller 4 and the printing paper 1. The second guide roller 16 may be used to guide the printing paper 1 and regulate the direction of movement thereof.

In this case, the rotation center axis 15A of the first guide roller 15A
Even if a becomes non-parallel to the rotation center axis 4a of the drive roller 4, as shown in FIG. 7, what regulates the moving direction of the printing paper 1 is not the first guide roller 15A and the drive roller 4. Since the second guide roller 16 and the driving roller 4 are used, the printing paper 1 is not moved in the direction indicated by the dashed line arrow a, but the printing paper l is moved in the direction already indicated by the solid line arrow. Therefore, the rotation center axis 4a of the drive roller 4 and the rotation center axis 15 of the first and second guide rollers 15A, 16
Even if Aa and 16a become non-parallel, it is possible to prevent positional deviations from occurring when the printing paper 1 is fed and returned.

In the embodiment described above, the present invention is applied to a printing method of a thermal transfer plotter for color printing, but the present invention is not limited to this. As a result, the printing paper is moved back and forth to the print head multiple times, and the drive roller is temporarily stopped during this reciprocation, and the print head is moved through the ink ribbon onto the printing paper located on the surface of the opening roller. It can be used in a printing method of a printing device (for example, an overwriting printing device) that prints by pressing.

[Effects of the Invention] As described above, in the printing method according to the present invention, the first guide roller is provided on the paper feed source side of the L drive roller and the first guide roller that sandwiches the printing paper between it and the late roller, and the first guide roller is provided on the paper feed source side of the drive roller. A second guide roller is provided to press the printing paper against the heel roller and move the printing paper in a predetermined direction by rotation of the drive roller, and with the printing paper between the paper roller and the second guide roller slackened, In other words, since printing is performed multiple times with the printing paper always slackened on the paper feeding source side, there is no deviation in the amount of movement of the printing paper as it is rotated in the forward and reverse directions of the clearance roller, and printing is No deviation occurs.

When the first and second guide rollers apply substantially the same frictional force to the printing paper and the printing paper is moved in a predetermined direction by the rotation of the drive roller,
Since the printing paper can be moved by pressing the driving roller on both the paper sending source side and the paper sending destination side of the driving roller, the printing paper can be moved without causing the printing paper to float on the driving roller. Furthermore, the frictional force that the first guide roller applies to the printing paper is made so small that it can be ignored compared to the frictional force that the second guide roller applies to the printing paper, and the first guide roller is moved in the direction of movement of the printing paper. If the second guide roller is configured to contribute to regulating the moving direction of the printing paper without contributing to regulating the movement direction of the printing paper, the rotation center axis of the drive roller and the J rotation center axis of the guide roller may become non-parallel. Even if this happens, it is possible to prevent positional deviations from occurring between when the printing paper is sent and when it returns.

[Brief explanation of drawings]

1 and 2 illustrate a first embodiment of the printing method according to the present invention, in which FIG. 1 is an explanatory diagram illustrating printing, FIG. 2 is an explanatory diagram illustrating paper rewinding, FIG. 3 is an explanatory diagram for explaining the second embodiment of the present invention, FIG. 3 is an explanatory diagram for explaining the second embodiment of the present invention, FIG. 4 is a perspective view showing the part shown in FIG. Figures (a) to (f) are explanatory views for explaining the third embodiment of the present invention, Figure 6 is a side view showing the portion of Figure 5, and Figure 7 is for explaining the fourth embodiment of the present invention. Explanatory diagram,
FIG. 8 and FIG. 9 are explanatory diagrams each explaining the conventional method. DESCRIPTION OF SYMBOLS 1... Print paper, 2... Paper roller, 4... Drive roller, 7... Ink ribbon, 8... Thermal head (print head), 15... First guide roller, 16
...Second guide roller, 17...Slip mechanism,
19...Pack tension imparting mechanism, T1, T...
·tension.

Claims (3)

[Claims] (1) By rotating the drive roller in the forward direction, the printing paper pulled out from the paper roller is moved from the paper feed source side to the paper feed destination side, and the drive roller is alternately rotated in the forward direction and the reverse direction. The printing paper is reciprocated a plurality of times with respect to the print head, the driving roller is temporarily stopped during this reciprocating movement, and the ink ribbon is transferred onto the printing paper located on the surface of the driving roller via the ink ribbon. In a printing device that performs printing multiple times by pressing the print head, a first guide roller is provided on the paper feed source side of the drive roller to sandwich the print paper between the drive roller and the paper feed side of the drive roller. A second guide roller is provided on the destination side for pressing the printing paper against the drive roller and moving the printing paper in a predetermined direction by the rotation of the drive roller, and the plurality of steps are performed by rotating the drive roller alternately in forward and reverse directions. The paper roller and the first
A printing method characterized in that printing is performed with the printing paper being slackened between guide rollers. (2) The printing method according to claim 1, wherein the frictional force applied to the printing paper by the first guide roller is substantially the same as the frictional force applied to the printing paper by the second guide roller. (3) The printing method according to claim (1), wherein the frictional force applied to the printing paper by the first guide roller is negligibly smaller than the frictional force applied to the printing paper by the second guide roller. .