JPH06340133A - Color printer - Google Patents

Abstract

PURPOSE:To provide a color printer capable of removing the slackening of recording paper and the oblique winding of the recording paper around a platen roller and generating no misregistration. CONSTITUTION:After the completion of paper feed operation (P2, P3), recording paper 2A is reciprocally operated two or more times before the recording of a first color to remove the slackening or oblique winding of the recording paper 2A (P4). The recording paper 2A stored in a storage part 40 is unwound (P8) after the completion of the recording of one color and, thereafter, the slackening removing operation of the recording paper 2A further reversing a platen roller 13 by the integer number of rotations of 1 or more of the platen roller 13 is performed (P9). Since this integer rotation is performed by the number of rotations equal to the positive integer being the least common multiple of the values calculated with respect to respective speed reducing mechanisms by calculating the value wherein the greatest common multiple of the number of teeth of the large pulley of the same speed reducing mechanism and that of a timing belt is divided by the number of the teeth of the large pulley with respect to the respective speed reducing mechanisms, the recording shift due to the habit of a drive mechanism system can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color printer for recording color ink on a transfer paper in a frame sequential manner by reciprocating a recording paper, and more particularly to a structure and control for eliminating registration misregistration for each color. It is a thing.

[0002]

2. Description of the Related Art Conventionally, color ink on the surface of a transfer paper is melted by heat of a thermal head (heat melting property) or sublimated (heat sublimation property) to form characters or image information at a desired position on a recording paper. There is known a color printer for performing color recording according to the above. The transfer paper is yellow, magenta, cyan, black (hereinafter simply abbreviated as Y, M, C, B).
Each color ink of each color is applied in the longitudinal direction in the form of a dagger in a frame-sequential manner.The thermal head is pressed against the recording paper via this transfer paper, and the recording paper is reciprocated to apply it to the transfer paper. The formed color inks are sequentially transferred. In such a color printer, if the registration accuracy of recording is poor, the reproduction screen becomes bad. Therefore, it is necessary to surely match the recording start position for each color. However, if such an arrangement is to be realized, the structure becomes complicated, which causes a cost increase of the color printer. Therefore, the present applicant proposes a color printer that is low in cost and has little misregistration by providing a clamp roller having a clamp function to a transport roller provided in the downstream portion of the platen roller (Japanese Patent Application No. 4-163575). Issue). The color printer will be described below.

FIG. 7 is a schematic block diagram of a conventional color printer. In the figure, a color printer 101 includes a platen roller 102 and a linear thermal head 10.
3, a cutter 104, a reversing roller 106 that reversely feeds the recording paper 105 when the recording paper 105 reciprocates, a clamp roller 107 that clamps the leading end of the recording paper 105, and the like. In the color printer 101, the recording paper 1 wound in a roll in the longitudinal direction and loaded in the case 1
Reference numeral 05 denotes the recording paper 10 via the reverse rotation roller 106.
The back surface of the sheet 5 is wound in a substantially U-shape along the outer periphery of the platen roller 102, and the leading end portion of the recording paper 105 is set in the color printer 101 via the clamp roller 107. During the recording operation, the recording paper 105 reciprocates on the platen roller 102 while being stored in the storage portion between the clamp roller 107 and the platen roller 102, and the colors Y, M, and C on the transfer paper 111 are sequentially recorded. It The recording paper 105 on which recording has been completed is taken out of the case by the clamp roller 107, cut by the cutter 104 for each one screen, and ejected. Further, the thermal head 102 forms a thermal head mechanism portion together with the transfer paper guide roller 108.
For example, when the transfer paper cartridge is replaced or the recording paper 105 is fed, the thermal head mechanism portion can be moved to the right in the drawing together with the transfer paper guide roller 108 and retracted.

The reciprocating motion of the recording paper 105 is performed by using the platen roller 102 and the reverse rotation roller 106. That is, during the printing operation, the platen roller 102 rotates in the direction of the arrow in the figure to send out the recording paper 105, and the reverse rotation roller 106 rotates in the opposite direction to the direction in the arrow in the drawing to reversely send the recording paper 105 sent out. Let The platen roller 102 and the reverse rotation roller 106 are driven by the same drive source via a one-way clutch. When the platen roller 102 is driven, the reverse rotation roller 106 is free, and when the reverse rotation roller 106 is driven, the platen roller 102 is driven. Become free.

By the way, the color printer 101 is
Accurate registration accuracy is required because color recording is performed in a frame sequential manner while the recording paper is reciprocally moved on the platen roller 102. Therefore, the clamp roller 107 holds the leading edge of the recording paper 105, and the platen roller 10 is held with the position of the leading edge of the recording paper fixed at the start of recording of each color.
By completely removing the slack of the recording paper 105 between the No. 2 and the clamp roller 107, the recording start position for each color is adjusted. The slack of the recording paper 105 is roughly removed by the reverse rotation roller 106, but the slack of the recording paper 105 cannot be completely removed only by the reverse rotation roller 106. Further, for example, even if the recording paper 105 is straightly clamped by the clamp roller 107, if the recording paper 105 is obliquely wound on the platen roller 107, the recording paper 105 is reciprocally moved to reciprocate each color. The recording position gradually shifts, and accurate registration accuracy cannot be maintained. Therefore, in the color printer 101, the slack between the platen roller 102 and the clamp roller 107 is finally removed by the transfer paper guide roller 108 provided in the thermal head mechanism section. The transfer paper guide roller 107 not only removes the slack of the recording paper 105, but also straightens the recording paper 105 obliquely wound on the platen roller 102, so that good registration accuracy is maintained. I was able to. Next, a structure for removing the slack of the recording paper 105 will be described with reference to FIG.

FIG. 8 is a diagram showing a structure of a main part of the color printer 101. In the figure, the transfer paper guide roller 108 is rotatably mounted on a thermal head mechanism section 109 on which the thermal head 103 is mounted, and the thermal head 103 is pressed to and separated from the platen roller 102, and the transfer paper 111 is interposed. Contact the recording paper 105. The transfer paper guide roller 108 is configured so as to enter inside the tangent line 110 circumscribing the clamp roller 107 and the platen roller 102, that is, the platen roller 102 side when the thermal head 103 is pressed against the platen roller 102. Before the recording operation, the slack of the recording paper 105 is roughly removed by the reverse rotation roller 106. Therefore, by pressing the thermal head 103, the transfer paper guide roller 108 only moves inside and the recording paper 105 is removed. The slack and the oblique winding of the recording paper 105 could be completely removed.

[0007]

By the way, like the color printer 101 described above, the transfer paper guide roller 108 is used.
In order for the clamp roller 107 and the platen roller 102 to come inward from the tangent line 110 that circumscribes the platen roller 102, it is necessary to provide the platen roller 102 with a one-way clutch. However, if the platen roller 102 is directly connected to the drive system without providing the one-way clutch, the transfer paper guide roller 108 cannot enter the inside of the tangent line 110, and the slack of the recording paper 105 must be sufficiently removed. Will not be possible. As a result, the number of parts is increased, and the cost of the one-way clutch itself is high, and it is necessary to provide a transfer paper roller. By providing the one-way clutch on the platen roller 102, the surface property of the platen roller 102,
The habit of the drive system of the platen roller 102, that is, the habit of meshing the teeth and the valleys of the pulley and the timing belt (nonuniformity of the teeth and valleys), the habit of the stepping motor (uneven rotation due to the nonuniformity of the slits), etc. It will be different for each color,
Subtle misregistration occurs and appears visually as color unevenness.

Therefore, the present invention has been made by paying attention to the above points, and eliminates the slack of the recording paper and the oblique winding around the platen roller with a simpler structure than the conventional color printer, thereby eliminating the registration shift. The purpose of the present invention is to provide a color printer that does not have a printer.

[0009]

As a means for achieving the above object, the present invention is provided in a downstream portion of a platen roller in a recording paper conveyance path from a recording paper supply portion to a discharge portion. Clamping means for holding the leading edge of the recording paper is provided, and when the recording is started for each color, the clamping means fixes the leading edge of the recording paper to position the recording start position, and after this positioning is completed. In a color printer that reciprocally moves the recording paper using the platen roller to record a basic color on the recording paper in a frame-sequential manner to reproduce an image or a character, the first color after the recording paper is fed. An object of the present invention is to provide a color printer characterized in that recording paper is reciprocally moved by using the platen roller before recording.

Further, as a means for achieving the above object, the present invention is provided downstream of a platen roller in a recording paper conveyance path from a recording paper supply section to a discharge section, and the recording paper And a platen roller driving means for driving the platen roller, the rotation output of which is directly connected to the platen roller.
At the start of recording for each color, the clamping means fixes the position of the recording paper leading end to position the recording start position, and after this positioning is completed, the platen roller is used to reciprocate the recording paper. In a color printer that reproduces an image or a character by recording the basic color on the recording paper in a frame sequential manner, after the recording of one color, the amount of the recording paper fed in the one-color recording by using the platen roller driving means. SUMMARY OF THE INVENTION An object of the present invention is to provide a color printer characterized in that the platen roller is simply rotated in the reverse direction and then the platen roller is further rotated in the positive integer number of revolutions to perform the slack eliminating operation of the recording paper.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view of a color printer which is an embodiment of the present invention. In FIG. 1, the color printer 1 is a cut recording paper (hereinafter,
A recording paper storage unit 2 for storing (hereinafter simply referred to as recording paper)
Have. The recording paper stored in the recording paper storage unit 2 is
Only the uppermost recording sheet stacked by the separating mechanism described later is separated and fed. The recording paper thus fed is reciprocally moved so that the color inks sequentially applied to the transfer paper are sequentially recorded according to desired recording information, and when the recording operation is completed, the recording paper is ejected from the paper ejection port 19A. The paper is discharged onto the paper discharge tray 19 on the upper part of the storage section 2.

Next, the internal structure of the color printer 1 of this embodiment will be described with reference to FIGS. FIG. 3 is a vertical sectional view of the color printer 1. In FIG. 3, reference numeral 2 denotes the recording paper storage unit 2 for storing the recording paper 2A, which is used when the recording paper 2A is reciprocated during the recording operation.
Is also a space for retracting the recording paper 2A for returning the recording sheet to the initial recording position. Reference numeral 10 denotes a thermal head mechanism unit 10 having a thermal head 12 mounted thereon, which is rotatably installed around a rotary shaft 10A. This thermal head mechanism unit 10
Is rotated to move the thermal head 12 to a retracted position (not shown) retracted from the platen roller 13 and a set position (position shown in FIG. 3) for setting the thermal head 12 at a position slightly separated from the platen roller 13. be able to.
The thermal head 12 is pressed against the platen roller 13 by a mechanism (not shown). Reference numeral 13 denotes a platen roller 13 in which an elastic member such as rubber is fixed to roller shafts rotatably mounted on the left and right frames of the color printer 1, and reciprocates the recording paper 2A during recording operation.
The recording paper 2A for which recording has been completed is conveyed onto the discharge guide plate 32. Reference numeral 14 is the transfer paper 14 wound around transfer paper rolls 14A and 14B in the longitudinal direction. The thermal head 12 is pressed against the recording paper 2A wound around the platen roller 13 via the transfer paper 14, so that the color ink applied to the transfer paper 14 is recorded on the recording paper 2A. .
Reference numeral 20 denotes a clamp mechanism portion 20 for clamping the leading end of the recording paper 2A, which comprises a movable clamp member 20A movable around a rotary shaft 21 and a fixed clamp member 20B fixed to the color printer 1. The movable clamp member 20A is driven by a drive mechanism (not shown).

Reference numeral 22 denotes a paper feed lever 22 for vertically moving the bottom plate 3 of the recording paper storage unit 2, which is rotatably provided around a shaft 22A. The paper feed lever 22 rotates in the direction of arrow 23 when the protrusion 22B is pushed leftward in the figure by a drive mechanism (not shown) (for example, a drive mechanism using a motor as a drive source). In this way, the paper feed lever 22
By rotating, the bottom plate 3 of the recording paper storage unit 2 rotates about a rotation shaft (not shown). Reference numeral 24 denotes a paper feeding / discharging roller 24 fixed to a paper feeding / discharging roller shaft 24A rotatably supported, and is made of a high friction member such as rubber. The paper feeding / discharging roller 24 is rotated by the same drive source as the platen roller 13. The structure will be described below with reference to FIG.

FIG. 2 is a diagram showing a drive mechanism for the platen roller 13 and the paper feed / discharge roller 24. In the figure,
The platen roller 13 is driven by a stepping motor 80.
Done by Right frame 79 of color printer 1
The rotation output of the stepping motor 80 fixed to R is
A deceleration composed of a pulley 82 integrally fixed to the output shaft 81, a pulley 83 rotating around a bearing planted on the right frame 79R, and a timing belt 84 hung between these pulleys 82, 83. The speed reducing mechanism 7 is decelerated by the mechanism 77 and further includes a timing belt 87 that is hung around a pulley 85 integrated with the pulley 83 and a pulley 86 fixed to the platen roller shaft 13A.
Further deceleration driving is performed by 8.

Here, the pulleys 82 and 83 are decelerated by a fraction, and the pulleys 85 and 86 are also decelerated by a fraction. That is, the ratio between the number of teeth of the pulley 83 and the number of teeth of the pulley 83 is set to integer: 1, and the ratio of the number of teeth of the pulley 85 to the number of teeth of the pulley 86 is also set to integer: 1. Therefore, the rotation output of the stepping motor 80 is transmitted to the platen roller 13 after being decelerated by an integer. Further, the platen roller 13 is rotated once to convey the recording paper for an integer number of lines, and the stepping motor 80 is set to 1
Since the rotation is an integer number of steps, the positional relationship between a certain position on the platen roller 13 and the output shaft 81 of the stepping motor 80 is the same combination for each color. Also,
The number of teeth of the timing belt 84 is 8 (small pulley).
The number of teeth is 2 and the number of teeth of the timing belt 87 is also set to an integral multiple of the circumference (= number of teeth) of the pulley (small pulley) 85.

On the other hand, the pulleys 83 and 85 penetrate the right frame by a shaft 88, and a pulley 89 is integrally fixed to the inner side thereof, and the pulley 91 is also decelerated by a timing belt 90. The pulley 91 is a paper feed / discharge roller shaft 24A.
It is integrated with. Further, the timing belt 90 is
The required tension is obtained by the idler 92, and the idler 9
The reference numeral 2 is rotatably provided on a shaft 95 provided on an adjusting plate 94 which is rotatable about a screw 93. Incidentally, 96 is an adjusting plate fixing screw.

In FIG. 3, reference numeral 30 designates the recording paper storage section 2 described above.
A separation mechanism unit 30 for separating one sheet of recording paper 2A stacked and stored in the storage unit, and separates the stacked recording paper 2A from the separation pin levers 7R and L rotatably attached by shafts 6R and L. Separation pins 8R, L and stopper pins 11R, L for restricting the separation pin levers 7R, L downward
Composed of and. Reference numeral 31 is a paper feed guide plate 31 for guiding the recording paper 2A separated by the separation mechanism unit 30 to the platen roller 13. This paper feed guide plate 31
Bends in a dogleg shape from directly below the platen roller 13 and extends to just below the thermal head 12, and is in contact with the platen roller 13 via an elastic member having one end fixed thereto. By thus contacting the leading end of the paper feed guide plate 31 with the platen roller 13, a frictional force is applied between the platen roller 13 and the recording paper 2A so that the platen roller 13 can convey the recording paper 2A. The frictional force is set to be smaller than the clamping force of the clamping mechanism section 20. Reference numeral 32 denotes a paper discharge guide plate 32 that forms a paper discharge path for guiding the recorded recording paper 2A to the paper discharge port 19A.

Next, the operation of the color printer 1 will be described with reference to the flow charts shown in FIGS. 4, 5 and 6. When an operation for recording operation is performed from the state shown in FIG. 3 (P1), a paper feeding operation is first performed (P1).
2). The paper feed lever 22 is rotated upward by a drive mechanism (not shown) to raise the bottom plate 3 of the recording paper storage unit 2. The raising of the bottom plate 3 is performed until the uppermost portion of the loaded recording paper 2A comes into contact with the paper feeding / discharging roller 24. Further, as the bottom plate 3 rises, the uppermost recording paper 2A is moved to the separating mechanism 3
The separation pins 8R and 8 of 0 are pushed up to the state shown in FIG. Further, the movable clamp member 20A is rotated clockwise around the rotation shaft 21 by the drive mechanism and stopped at a predetermined position, and the thermal head 12 is
The set position is slightly separated from the platen roller 13.

From the above-mentioned state, when the paper feeding / discharging roller 24 rotates counterclockwise, the uppermost recording paper 2A which is in contact with the paper feeding / discharging roller 24 is pushed out to the platen roller 13 side and the separation pin. The recording paper 2A separated by 8R and 8L is fed by the paper feed / discharge roller 24 to the paper feed guide plate 31.
Is transported over. When the recording paper 2A conveyed on the paper feed guide plate 31 reaches the position where the paper feed guide plate 31 is in contact with the platen roller 13 whose front end is rotating together with the paper feed / discharge roller 24, the recording paper 2A is described above. The platen roller 13 is also conveyed by the pressing force of the paper feed guide plate 31.

The recording paper 2A thus conveyed is conveyed along the peripheral surface of the platen roller 13 and reaches the stopper portion 20C of the movable clamp member 20A. Recording paper 2A
Of the movable clamp member 20A has a stopper portion 20C.
When it reaches, the leading edge of the recording paper 2A is clamped. Here, even when the recording paper 2A is fed obliquely, the leading end portion of the recording paper 2A comes into contact with the stopper portion 20C and comes along the stopper portion 20C, so that recording is performed even when clamped in this state. The front end of the paper 2A is never slanted. However, since it is obliquely wound on the platen roller 13, the recording paper 2A is twisted between the platen roller 13 and the stopper portion 20C to generate slack. When the recording paper 2A is clamped by the clamp mechanism unit 20, the bottom plate 3 (see FIG. 3) of the recording paper storage unit 2 is lowered to separate the paper feeding / discharging roller 24 from the recording paper 2A.

Clamp mechanism 20 and platen roller 13
There is a possibility that the recording sheet 2A in between has looseness due to the above-mentioned oblique sheet feeding or the like. Therefore, next, the stepping motor 80 (see FIG. 2) is reversed to pull the recording paper 2A by the platen roller 7 to remove the slack of the recording paper 2A (P3). Here, since the clamping force of the clamping mechanism unit 20 is set to be larger than the conveying force of the platen roller, the leading end of the recording paper 2A does not deviate from the clamping mechanism unit 20. In this way, the recording paper 2A is fixed to the fixed clamp member 20.
The state is substantially along the tangent line connecting the curved surface of B and the outer periphery of the platen roller 13. Note that the rotation amount of the stepping motor 80 at this time may be rotation for a fixed time by a timer. However, since the recording paper 2A has an elastic force, the recording paper 2A cannot be obtained by simply reversing the platen roller 13.
The looseness of A and the oblique winding on the platen roller 13 cannot be completely removed. Moreover, the elasticity of the recording paper changes because the storage operation to the storage section 40 (see FIG. 5) and the operation of feeding back the stored recording paper 2A are repeated with recording Y, M, and C described later. To do. As a result, the recording start position slightly shifts due to the backward feeding operation of the stored recording paper 2A, which causes registration shift.

Therefore, before recording the first color (Y color),
The recording paper is reciprocated a plurality of times to remove the slack and the oblique winding of the recording paper 2A, and at the same time, the elastic force of the recording paper 2A is weakened so that the recording paper 2A becomes less than a certain value (P4). That is, the thermal head 12 is brought into contact with the platen roller 13 in a non-energized state, the platen roller 13 is fed in the forward direction (the direction in which the recording paper 2A is fed) for several tens of lines, and then the lines for more lines are reversed. . For example, 30 lines forward rotation and 50 lines reverse rotation are set as one cycle, and are repeated for several cycles. By this operation, the slack and oblique winding of the recording paper 2A can be removed by the elastic force of the recording paper 2A, and the elastic force of the recording paper 2A (in particular, the elastic force between the clamp mechanism section 20 and the platen roller 13) is lost. , The second and third colors have the same state due to the reciprocating motion, and a good image without misregistration can be obtained. The operation condition of this operation changes depending on the elastic force of the recording paper 2A.
The number of lines for reverse rotation may be small and the number of cycles may be small. It is necessary to increase the number of lines and the number of cycles for a recording paper having strong elasticity.

When the leading end of the recording paper 2A is clamped as described above and the slack eliminating operation of the recording paper 2A is completed, the operation shown in FIG.
The thermal head 12 to the platen roller 13 as shown in FIG.
The color ink on the transfer paper 14 is recorded on the recording paper 2A while the recording paper 2A is stored in the storage section 40 (P
5). When the recording of the first color is completed, the thermal head 12
Are separated from each other (P6), the next color of the transfer paper 14 is cued (P7), and then the platen roller 13 is reversed in the number of lines normally rotated in the Y-color recording to be stored in the storage unit 40. Rewind 2A (P8). In this state, since the slack of the recording paper 2A is not completely removed, the slackening operation of the recording paper 2A is performed by further reversing the platen roller 13 by the integral rotation number of 1 or more (P9). Here, the integer number of rotations of the platen roller 13 by the slackening operation of the recording paper is P _{1 for} the number of teeth of the pulley 83 (the number of teeth of the large pulley), P _{2 for} the number of teeth of the pulley 86 (the number of teeth of the large pulley), The number of teeth of the timing belt 84 (the number of teeth of the timing belt) is T ₁ ,
When the number of teeth of the timing belt 87 (the number of teeth of the timing belt) is T ₂ , it is determined by the following expression 1.

[0024]

[Equation 1] However, LCM (N ₁ , N ₂ ) indicates that it is the least common multiple of the integer N ₁ and the integer N ₂ .

For example, if the reduction ratio by the pulleys 82 and 83 is 1/2 and the reduction ratio by the pulleys 85 and 86 is 1/5, and the number of teeth of the pulley 82 is M ₁ , the number of teeth of the pulley 83 is 2 × M. _{If the} number of teeth of the pulley 85 is M ₂ , the number of teeth of the pulley 86 is 5 × M ₂ . Further, the number of teeth of the timing belt 84 is set to 3M ₁ , and the timing belt 8
Assuming that the number of teeth of 7 is 6 M ₂ , the integer number of rotations of the platen roller 13 is 6 according to the formula 1. By this operation, even if the slackening operation of the recording paper 2A is performed using the platen roller 13 after the stored recording paper 2A is fed back, the platen roller 13, the stepping motor 80, Pulleys 82, 83,
The relative positional relationship between 85 and 86 and the timing belts 84 and 87 is the same for the first color and the second color. That is, the teeth and valleys of the timing belts 84 and 87 are
2, 83 and the teeth and valleys of the pulleys 85, 86 are always in the same combination, and the platen roller 13
Since the recording paper is conveyed by an integer number of lines per one rotation and the stepping motor 80 has an integer number of steps per rotation, the positional relationship between a certain position on the platen roller 13 and the output shaft 81 of the stepping motor 80 is also the first. The same combination is obtained for the first color and the second color. As a result, it is possible to prevent the registration deviation due to the eccentricity of the platen roller 13 and the minute registration deviation due to the peculiarities of the pulley, the timing belt and the stepping motor, thereby preventing the color unevenness due to the feeding of the recording paper. Then, for the M color and the C color, the slack eliminating operation is similarly performed after the completion of the recording of one color, and the recording is sequentially performed (P11). The slack eliminating operation may not be performed after the recording operation for the final color (C color or B color) is completed.

When the recording operation is completed, the clamp at the leading end of the recording paper 2A is released, the thermal head 12 is separated from the platen roller 13, and the recording paper 2A is moved by the platen roller 13 onto the discharge guide plate 32 which is a discharge path. Be transported.
When the leading end of the recording paper 2A reaches the paper feeding / discharging roller 24, the paper feeding / discharging roller 24 that was rotating together with the platen roller 13
Is discharged onto the discharge tray 19 (P1
2).

As described above, the color printer 1 according to the present embodiment includes the one-way clutch and the transfer paper guide roller 1.
The recording paper 2A such as 08 is provided only by controlling the operation of the platen roller 13 without providing a member for removing the slack of the recording paper 2A.
The slack can be completely removed. That is, although the number of parts of the color printer 1 is reduced, it is possible to secure good registration accuracy, and it is possible to further reduce the cost of the color printer 1 by reducing the number of parts. Further, the speed reduction ratios of the speed reduction mechanisms 77 and 78 are each an integer fraction, and the number of teeth of the timing belt 84 is set to the pulley 8
2 is an integral multiple of 2, the number of teeth of the timing belt 87 is an integral multiple of the pulley 85, and after the recording of one color is completed, the platen roller 13 is reversed by the amount of the recording paper 2A sent in this one-color recording. Since the platen roller 13 is rotated in the reverse direction by the integer number of rotations determined by the above formula 1, even if the slackening operation of the recording paper 2A is performed, the stepping motor 80, pulleys 82, 83, 85, 86,
The positional relationship between the timing belts 84 and 87 is the same as the positional relationship for the first color. Therefore, it is possible to prevent a slight misregistration due to the habit of the drive mechanism system. With the above-described configuration, it is possible to provide the recording apparatus 1 with no misregistration at low cost.

In the above-described embodiment, the drive system of the platen roller 13 is composed of the timing belts 84 and 8.
Although the structure having 7 is adopted, a structure in which a pair of gears are combined in a plurality of stages may be adopted, and in this case, the structure may be the same as the above-mentioned structure. Further, in the above-described embodiment, the color printer 1 using the cut recording paper 2A has been described, but the color printer of the present invention is not limited thereto, and the effect is also obtained in the color printer using the roll recording paper. There is enough.

[0029]

As described above, according to the color printer of the present invention, the color paper is provided at the downstream side of the platen roller in the recording paper conveyance path from the recording paper supply section to the discharge section. Clamping means for holding the leading end portion is provided, and at the start of recording for each color, the clamping means fixes the leading end portion position of the recording paper to position the recording start position, and after this positioning is completed, the platen roller In a color printer that reciprocally moves the recording paper by using the above-mentioned method to record a basic color on the recording paper in a frame-sequential manner and reproduce an image or a character.
Before recording the color, the recording paper is reciprocally moved using the platen roller, so there is no need to provide a member for removing the slack of the recording paper, and the slackening of the recording paper only by controlling the operation of the platen roller, Oblique winding can be completely removed.

Clamping means that is provided downstream of the platen roller in the conveyance path of the recording paper from the recording paper supply section to the discharge section and clamps the leading end of the recording paper.
A rotation output is directly connected to the platen roller and a platen roller driving means for driving the platen roller is provided, and the clamping means fixes the position of the leading end of the recording paper at the start of recording for each color to determine the recording start position. In a color printer that performs positioning and, after the positioning is completed, reciprocally moves the recording paper by using the platen roller to record basic colors in a frame sequential manner on the recording paper to reproduce an image or a character, After the completion of the one-color recording, the platen roller driving means is used to reverse the platen roller by the amount of the recording paper fed in the one-color recording, and then the platen roller is further reversed by a positive integer number of revolutions. Since the slack eliminating operation is performed, the recording start position on the platen roller can be made the same for each color, and there is no registration due to eccentricity of the platen roller. It can be prevented.

In addition, a reduction mechanism consisting of a pair of rotating bodies is
In the above color printer, the color printer includes a speed reducing unit that is interposed between the platen roller and the platen roller driving unit in a plurality of stages or a combination of a plurality of stages, and that reduces the rotational output of the platen roller driving unit to transmit the rotation output to the platen roller. Each one stage of the deceleration mechanism decelerates the transmitted rotational output to an integral fraction, so that even if the slackening operation of the recording paper is performed, the platen roller and the platen roller driving means at the start of recording for each color are The positional relationship can be made equal to the positional relationship at the start of recording of the first color, and a slight misregistration due to the habit of the platen roller driving means can be prevented.

The speed reducing mechanism, which is composed of a pair of large and small pulleys and a timing belt which is hung between the pair of pulleys and has an integer multiple of the number of teeth of the small pulley, is combined with one or more stages. In the color printer having the decelerating means, the number of rotations for rotating the platen roller in the slack eliminating operation is the maximum common multiple of the number of teeth of the large pulley and the number of teeth of the timing belt of the same deceleration mechanism. A value divided by a number is calculated for each speed reduction mechanism, and is equal to a positive integer that is the least common multiple of the values calculated for each speed reduction mechanism. In, the positional relationship among the platen roller drive mechanism, the pulley, and the timing belt is the same as the positional relationship for the first color. Therefore, it is possible to prevent a slight misregistration due to the peculiarities of the pulley and the timing belt as well as the platen roller driving mechanism.

[Brief description of drawings]

FIG. 1 is an external perspective view of a recording apparatus that is an embodiment of the present invention.

FIG. 2 is a diagram showing a drive mechanism for a platen roller 13 and a paper feed / discharge roller 24.

FIG. 3 is a vertical cross-sectional view of a main part of the recording apparatus 1 (immediately after recording paper is stored).

FIG. 4 is a vertical cross-sectional view of a main part of the recording apparatus 1 (when recording paper is fed).

FIG. 5 is a vertical cross-sectional view of a main part of the recording apparatus 1 (during recording paper operation).

FIG. 6 is a flowchart showing a recording operation of the recording device 1.

FIG. 7 is a schematic configuration diagram of a conventional recording apparatus.

FIG. 8 is a diagram showing a structure of a main part of a conventional recording apparatus.

[Explanation of symbols]

 1 Color Printer 2 Recording Paper Storage 2A Recording Paper 3 Bottom Plate 4R, L Recording Paper Storage Frame 5R, L Width Regulation 7R, L Separation Pin Lever 8R, L Separation Pin 10 Thermal Head Mechanism 11R, L Stopper Pin 12 Thermal Head 13 platen roller 14 transfer paper 14A, B transfer paper roll 20 clamp mechanism section (clamping means) 20A movable clamper 20B fixed clamper 22 paper feed lever 24 paper feed / discharge roller 30 separation mechanism 31 paper feed guide plate 32 paper discharge guide plate 77, 78 deceleration mechanism 80 stepping motor (platen roller driving means) 82, 83, 85, 86, 89, 91 pulley 84, 85, 90 timing belt

[Procedure amendment]

[Submission date] February 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

According to the present invention, as means for achieving the above-mentioned object, a platen roller, a platen roller driving means for rotating the platen roller, and a traveling of a recording paper supply section to a discharge section. At least two clamps are provided downstream of the platen roller in the path to hold the recording paper, and the recording paper on the platen roller is reciprocally moved so that at least two colors are sequentially printed on the recording paper. In a color printer for transferring an image to record an image, the clamp means holds the recording paper, and before the recording is performed on the recording paper, the platen roller is rotated by the platen roller driving means to rotate the platen roller. An object of the present invention is to provide a color printer characterized by reciprocating a recording paper.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Further, according to the present invention, as means for achieving the above object, a platen roller, a platen roller driving means for rotating the platen roller, and a traveling path from a sheet feeding section to a sheet discharging section are provided. At least two colors are transferred to the recording paper in a frame-sequential manner by reciprocating the recording paper on the platen roller, the clamping means being provided on the downstream side of the recording head and holding the recording paper. In a color printer for recording an image, after one-color recording is completed, the platen roller driving means is used to reverse the platen roller by the amount of recording paper fed in the one-color recording, and then a positive integer of the platen roller. An object of the present invention is to provide a color printer characterized by reversing the rotation speed.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Therefore, before recording the first color (Y color),
The recording paper is reciprocated a plurality of times to remove the slack and the oblique winding of the recording paper 2A, and at the same time, the elastic force of the recording paper 2A is weakened so that the recording paper 2A becomes less than a certain value (P4). That is, the thermal head 12 is brought into contact with the platen roller 13 in a non-energized state, the platen roller 13 is fed in the forward direction (the direction in which the recording paper 2A is fed) for several tens of lines, and then the lines for more lines are reversed. . For example, 30 lines forward rotation and 50 lines reverse rotation are set as one cycle, and are repeated for several cycles. By this operation, the recording paper 2A becomes familiar with the shape of the transport path.
The slack and the oblique winding are removed, and the elastic force of the recording paper 2A (in particular, the elastic force between the clamp mechanism section 20 and the platen roller 13) is weakened, and the recording movement is also performed in the second and third colors.
The state of the recording paper 2A becomes the same due to the reciprocating motion at the time of printing , and a good image without misregistration can be obtained. This operation has different operating conditions depending on the elastic force of the recording paper 2A. For example, a recording paper with a weak elastic force may have a small number of forward and reverse lines and a small number of cycles. It is necessary to increase both the number and the number of cycles.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

[0029]

As described above, according to the color printer of the present invention, by reciprocating the recording paper on the platen roller, at least two colors are transferred to the recording paper in a frame sequential manner to record an image. In, after the clamp means holds the recording paper and before the recording is performed on the recording paper, the platen roller driving means is used to rotate the platen roller to reciprocate the recording paper. It is not necessary to provide a member for removing the slack, and the slack of the recording paper and the oblique winding can be completely removed only by controlling the operation of the platen roller.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Further, in a color printer for recording an image by reciprocally moving the recording paper on the platen roller to transfer at least two colors to the recording paper in a frame-sequential manner,
After the one-color recording is completed, the platen roller driving means is used to reverse the platen roller by the amount of the recording paper fed in the one-color recording, and then the platen roller is further reversed by a positive integer number of revolutions. It is possible to make the above-mentioned recording start position the same for each color, and it is possible to prevent registration deviation due to eccentricity of the platen roller.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

In addition, a reduction mechanism consisting of a pair of rotating bodies is
In the color printer having a speed reducing unit that is interposed between the platen roller and the platen roller driving unit in a combination of a plurality of stages or a plurality of stages, and that reduces the rotational output of the platen roller driving unit to transmit it to the platen roller, Since each one stage of the deceleration mechanism is configured to decelerate the transmitted rotational output to an integer fraction, after the completion of one-color recording, the platen roller is rotated in the reverse direction by the amount of recording paper fed in this one-color recording. After that, even if the positive integer number of revolutions of the platen roller is further reversed, the positional relationship between the platen roller and the platen roller driving means at the start of recording for each color can be made equal to the positional relationship of the first color recording start. It is possible to prevent a slight misregistration due to the habit of the roller driving means.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

The speed reducing mechanism, which is composed of a pair of large and small pulleys and a timing belt which is hung between the pair of pulleys and has an integer multiple of the number of teeth of the small pulley, is combined with one or more stages. In the color printer having the speed reducing means, after the one-color recording is completed, the platen roller is reversed by the amount of the recording paper fed in the one-color recording, and the number of teeth of the large pulley and the timing belt of the same speed reducing mechanism are further increased. The value obtained by dividing the least common multiple with the number of teeth of the large pulley by the number of teeth of is calculated for each reduction mechanism, and the platen roller is rotated by the number of revolutions equal to a positive integer which is the least common multiple of the values calculated for each reduction mechanism. Position, the platen roller drive mechanism, pulley, and timing belt position are adjusted at the start of recording each color, even if the slackening operation of the recording paper is performed. Engagement is the same as the positional relationship of the first color. Therefore, it is possible to prevent a slight misregistration due to the peculiarities of the pulley and the timing belt as well as the platen roller driving mechanism.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B41J 29/42 B 35/16 B

Claims (4)

[Claims] 1. A recording paper conveyance path from a recording paper supply section to a discharge section, which is provided downstream of a platen roller,
Clamping means for holding the leading edge of the recording paper is provided, and at the start of recording for each color, the clamping means fixes the leading edge of the recording paper to position the recording start position, and after this positioning is completed. In a color printer that reciprocally moves the recording paper using the platen roller to record a basic color on the recording paper in a frame-sequential manner to reproduce an image or a character, the first color after the recording paper is fed. A color printer characterized in that a recording paper is reciprocally moved by using the platen roller before recording. 2. A recording paper conveyance path from a recording paper supply section to a discharge section, which is provided downstream of a platen roller,
It has a clamp means for holding the leading end of the recording paper, and a platen roller drive means for driving the platen roller whose rotation output is directly connected to the platen roller, and the clamp means at the start of recording for each color. The recording start position is positioned by fixing the position of the leading edge of the recording paper, and after this positioning is completed, the recording paper is reciprocally moved using the platen roller so that the basic colors are frame-sequentially printed on the recording paper. In a color printer which reproduces an image or character by recording with, after the completion of one-color recording, the platen roller driving means is used to reverse the platen roller by the amount of recording paper fed in the one-color recording, and then A color printer characterized by performing a slack eliminating operation on recording paper by reversing a positive integer number of revolutions of a platen roller. 3. A deceleration mechanism composed of a pair of rotating bodies, which is interposed between the platen roller and the platen roller driving means in a combination of one stage or a plurality of stages, and decelerates the rotation output of the platen roller driving means. 3. A color printer having a speed reducing means for transmitting to a platen roller, wherein each one stage of the speed reducing mechanism reduces the transmitted rotational output by a fraction of an integer. 4. A reduction gear mechanism comprising one pair of large and small pulleys and a timing belt which is hung between the pair of pulleys and has a number of teeth which is an integral multiple of the number of teeth of the small pulley. In the color printer having the speed reducing means, the number of rotations for rotating the platen roller in the slack eliminating operation is the maximum common multiple of the number of teeth of the large pulley and the number of teeth of the timing belt of the same speed reducing mechanism. 4. The color printer according to claim 3, wherein a value divided by is calculated for each speed reduction mechanism and is equal to a positive integer that is a least common multiple of the values calculated for each speed reduction mechanism.