JPH0630912B2 - Recording device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording apparatus that includes a recording paper winding unit that holds a leading end of a recording paper and winds the recording paper.

<Prior Art and Its Deficiencies> When performing a recording operation multiple times on one recording sheet, it is necessary to reciprocate the recording sheet multiple times with respect to the recording head. For example, in a thermal transfer color printer, thermal transfer is performed on one sheet of recording paper by using four color ink films of yellow, magenta, cyan, and black. At that time, if the recording sheet is not accurately reciprocated, color misregistration, etc. Cause of. However, conventionally, it was difficult to accurately reciprocate the recording paper when recording on a general sheet-shaped recording paper having no sprocket hole.

<Objects of the Invention> An object of the present invention is to provide a recording apparatus in which, when recording is performed by reciprocating the recording paper a plurality of times, the recording paper is accurately reciprocated and the positional accuracy of a recorded image on the recording paper is improved. To do.

<Structure and Effect of the Invention> The present invention relates to a recording apparatus that reciprocates a recording sheet a plurality of times with respect to a recording head to perform a plurality of recording operations on one recording sheet. A recording paper take-up unit that holds the recording paper and winds the recording paper is provided on the downstream side of the platen roller in the recording paper conveyance direction, and the recording paper take-up unit that rotates the recording paper take-up unit at the time of recording Control means, a recording head control means for driving the recording head while pressing the recording head against the platen roller during recording, and a recording paper rewinding means for rewinding the recording paper wound on the recording paper winding section, Before starting the first recording operation for one recording sheet, the unrecorded recording sheet is transferred to the recording sheet winding section by driving the recording sheet winding section control section without driving the recording head control section. After taking Dan winding, by driving the rewind means rewinds the wound recording paper to the recording sheet take part, characterized in that a recording sheet preliminary feeding means.

According to the present invention, since the leading end of the recording paper is pinched and wound by the recording paper take-up unit, the recording paper is reciprocated accurately, and the recording paper is taken up before the recording by the recording head. Since the recording paper is once wound around and then rewound, recording can be performed in a state where the looseness or slack of the recording paper is removed. Therefore, for example, when a thermal transfer color printer is configured, it is possible to accurately superpose colors of any of the four color images without displacement.

<Embodiment> FIG. 1 is a view showing the structure of a thermal transfer color printer according to an embodiment of the present invention. Reference numeral 16 is a paper feed cassette, and the recording papers 9 are stacked and mounted on a mounting plate 16a. Further, 17 is a spring for pushing up the mounting plate 16a, and the recording paper 9
The height of the surface of the recording paper 9 is kept substantially constant according to the number of stacked sheets. Reference numeral 15 denotes a paper feed roller, which rotates the roller one turn to the right to feed the uppermost one of the stacked recording papers. Reference numerals 18 and 19 are guides for guiding the fed recording paper to the feed rollers 20 and 21. Reference numeral 22 denotes a guide member, which is positioned in a substantially horizontal direction during paper feeding. Therefore, the recording paper is conveyed by the feed rollers 20 and 21 along the conveying paths 27 and 28.
Reference numerals 29, 3a and 3b denote paper detection sensors (hereinafter simply referred to as paper sensors), which are reflection type photosensors and detect the conveyance state of the recording paper. Reference numeral 1 denotes a platen roller (hereinafter simply referred to as a platen), 2 denotes a bail roller, and the recording paper is fed toward the drum 7 when the platen rotates counterclockwise.

An ink film tape 10 is fed from the ink film tape supply unit toward the ink film tape winding unit. Reference numeral 4 denotes a thermal head, which is supported by a support shaft 4a and moves in a direction of an arrow G via a support spring 5 when a lever 6 moves in a direction of an arrow F.
As a result, the thermal head 4 presses the ink film tape and the recording paper against the platen 1.

A clamp 8 is connected to the drum 7 by a spring 11. The clamp 8 rotates together with the drum 7, but if the drum 7 rotates counterclockwise from the position shown in the drawing (rotates in the direction of arrow D), the clamp 8 comes into contact with the stopper 31 fixed to the main body and the position of the clamp is The drum 7 continues to stretch the spring 11. As a result, the recording paper holding section 12 is opened. In this state, as described above, the front end of the recording paper is sent to the recording paper holding portion 12 by the platen 1, and then the drum 7 is rotated to the right (rotated in the direction of arrow C), so that the tension of the spring 11 causes the leading end of the recording paper. And the recording paper is wound around the drum 7. At this time, the ink film tape 10
The thermal head 4 in synchronization with the recording paper feed speed.
The desired recording can be performed on the recording paper by driving. Next, by driving the lever 6 in the direction opposite to the arrow F, the thermal head 4 is separated from the platen 1, and a rotational torque in the right direction is applied to the platen 1 to cause the drum 7 to move.
The recording paper is returned to the initial position again by rotating to the left, and the recording processing similar to the above is repeated. At this time, the guide member 22 is held at the position shown in the drawing, and the recording paper is returned in the direction from the transport path 28 to 23. When ejecting the recording paper wound around the drum 7, the recording paper is removed from the drum 7 by rotating the drum 7 counterclockwise to a position where the recording paper holding portion 12 is in an open state. Further, this recording paper is discharged to the discharge tray 26 by the discharge rollers 24 and 25.

FIG. 2 is a block diagram of a control unit of the thermal transfer color printer. Reference numeral 100 denotes a main CPU, which performs processing in accordance with a control program stored in advance in the ROM 101. The RAM 102 is a memory that is used as a working area when performing the processing and further stores image information to be recorded. The image scanner 103 converts image information such as a color original document into digital information, and the RAM 1
Image information is stored in a predetermined area 02. The multiplexer 104 switches between the bus line of the image scanner 103 and the bus line of the main CPU. 10
Reference numeral 5 denotes a sub CPU for controlling recording, which is the ROM 1
Processing is performed according to a control program stored in advance in 06. The RAM 107 is a memory used as a working area when performing the processing. Various sensors 108 include, for example, the above-described paper sensors 3a and 3b, the photo sensor 30b, and the like. Reference numeral 109 is an I / O for the sub CPU 105 to read the states of these sensors. The pulse motor 110 is a motor that drives the drum 7, and 111 is an I / O that controls the pulse motor according to the processing of the sub CPU 105. DC motor 11
2 is a DC motor for driving the platen 1;
Reference numeral 3 is an I / O for controlling the forward rotation, the reverse rotation and the stop of the motor. Reference numeral 114 is a motor for driving other drive units such as a motor for driving the paper feed roller 15. The thermal heads 4 are heating elements arranged in a line in the width direction of the recording paper, and the driver 115 is a sub CPU.
The thermal head 4 is driven based on the recording data output from 105. The sub CPU 105 is the main CPU 10
The image information is received from 0, recording data is constructed in a predetermined procedure, and is output to the driver 115.

3A to 3F are flowcharts showing the processing procedure of the control unit (mainly the processing procedure of the sub CPU 105). When performing a new recording on the recording paper, first, the drum 7
The pulse motor for driving is driven from the position shown in FIG. 1 for a predetermined number of steps and rotated in the right direction. As a result, the recording paper nip portion 12 is opened (n10). Next, the lever 6 is driven in the direction opposite to the arrow F to separate the thermal head 4 from the platen. Further, the guide member 22 is set in the horizontal direction to open the paper feed path (n12 → n14). Then, the paper feed roller 15 is rotated rightward to feed the recording paper 9 toward the feed rollers 20 and 21.
21 is driven (n16 → n18). As a result, the recording paper is sent out through the conveying paths 27 and 28. After that, the paper sensors 3a and 3b detect the leading edge of the recording paper,
When either one is detected, the timer is reset and the time until the other paper sensor detects is counted. That is, if the paper sensor 3a (MS1) detects the leading edge of the recording paper at n22, the timer T is reset and the paper sensor 3b (MS1)
2) increments the timer T until the leading edge of the recording paper is detected (n24 → n26 → n28 → n30 → n2).
6). Here, the determination of n30 is to determine whether or not the value of the timer T exceeds the previously stored allowable range Tm, and the value of the timer T exceeds the allowable range before the paper sensor MS2 detects the leading edge of the recording paper. In this case, the conveyance of the recording paper is stopped and it is displayed that the conveyance of the recording paper is unbalanced (n32 → n
34). When MS2 of the two paper sensors detects first, the timer T is first reset and the timer T is incremented until the paper sensor MS1 detects the leading edge of the recording paper (n38 → n40 → n42 → n44 → n40). Similarly, the timer T is used until the paper sensor MS1 detects the leading edge of the recording paper.
If the value of exceeds the allowable range Tm, the conveyance of the recording paper is stopped and the same error display is performed (n44 →→ n32 → n
34). The permissible range Tm is set to a value corresponding to, for example, a deviation of 0.5 mm on both sides of the leading edge of the recording paper. In addition, this T
The value of m can be variable.

If the value of the timer from when one paper sensor detects the leading edge of the recording paper until when the other paper sensor detects it is within the allowable range, then the platen 1 pre-sets the recording paper as shown in FIG. 3 (B). Send it out for a specified distance and stop it. (N48 → n
50 → n52 → n54). After the leading edge of the recording paper is fed to the recording paper holding portion 12 in this way, the recording paper holding portion is closed by holding the recording paper holding portion by rotating the drum 7 clockwise. (N56).

Subsequently, as shown in FIG. 3C, the drum 7 is rotated rightward as it is until the paper sensors 3a and 3b detect the trailing edge of the recording paper (n60 → n62). The paper sensor 3 is at the rear edge of the recording paper
After the recording paper is wound around the drum 7 until the positions a and 3b are reached, the drum is stopped and the guide member 22 is further rotated as shown in FIG. 1 to open the conveying paths 28 and 23 (n.
64 → n66). In this state, a reverse rotation torque is applied to the platen 1, and the drum 7 is rotated counterclockwise to rewind the recording paper until the drum 7 reaches the home position (n68 → n70 → n7).
2). When the recording paper is rewound in this way, a reverse rotation torque is applied to the platen driven by the DC motor, and the conveyance speed of the recording paper is controlled by the rotation speed of the drum driven by the pulse motor. You can rewind while giving. The home position is detected by the transmissive photosensor 30b detecting the light shielding plate 30a provided on the inner surface of the drum 7, as shown in FIG. The left rotation of the drum rotates the drum 7 and the platen 1 after rotating the drum 7 by a predetermined step even after the home position is exceeded (n74 → n76). In this manner, the slack of the recording paper is removed by feeding the recording paper once and returning it to the initial position again.

Thereafter, as shown in FIG. 3D, while the thermal head 4 is being pressed against the platen 1, the drum 7 is rotated clockwise until the drum 7 reaches the home position and the ink film tape is fed (n80 → n82 → n84 → n
82). At this time, since the thermal head 4 presses the recording paper against the platen, the recording paper is conveyed without sagging due to the rotation torque of the drum. When the drum 7 reaches the home position, the counter P that counts the number of steps of the pulse motor that drives the drum 7 is reset, and the ink film tape is fed as the drum rotates to the right to drive the thermal head 4 (n86 → n88). This process is repeated until the number of pixels Pn corresponding to the length of the screen to be recorded in the recording paper feed direction is reached by the counter P (n8).
8 → n90 → n92 → n94 → n88). The determination of n92 is whether or not the paper sensors 3a and 3b have detected the trailing edge of the recording sheet. If the trailing edge of the recording sheet is detected before the processing of one screen to be transferred is completed, the transfer operation is performed. To indicate that the recording paper size is abnormal (n96 → n9
8).

After the recording paper is wound around the drum 7 and transferred onto the recording paper as described above, a predetermined time is waited for the ink transferred immediately before to be completely fixed as shown in FIG. 3 (E). After that, the thermal head 4 is separated from the platen and a reverse rotation torque is applied to the platen 1 (n100 → n
102 → n104). Then, the recording paper is rewound by rotating the drum 7 counterclockwise until it reaches the home position. Also at this time, send the ink film tape,
Prepare for the next transfer (n106 → n108). Even after the drum 7 reaches the home position, the drum 7 and the platen 1 are stopped after rotating leftward to a predetermined position (n110 → n112). This returns to the initial state of the next transfer.

Ink film tapes of Y, M, C, B, Y, M. ． ．
And the color image is recorded on one recording sheet by performing the above processing for four colors (n114 →
→ n80). After the transfer of all the colors is completed, as shown in FIG. 3 (F), a reverse rotation torque is applied to the platen 1 to rotate the drum 7 counterclockwise and further drive the paper discharge rollers 24, 25 to drive the drum 7 The recording paper wound around the paper is discharged to the paper discharge tray 26 through the conveying paths 28 to 23 (n120 → n122 → n124). A color image is recorded on one recording sheet by the above processing. Subsequently, when recording is performed on the second recording sheet, the above processing is repeated (n126 →→ n10).

As described above, the recording paper can be accurately reciprocated, and a color transfer image without color misregistration can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a thermal transfer color printer which is an embodiment of the present invention, FIG. 2 is a block diagram of a control unit of the thermal transfer color printer, and FIGS. 3A to 3F are processes of the control unit. It is a flowchart showing a procedure. 1 ... Platen, 2 ... Bail roller, 3a ... Paper sensor (MS1), 3b ... Paper sensor (MS2), 4 ... Thermal head, 7 ... Drum, 8 ... Clamp, 9 ... Recording paper, 23, 27, 28 ... Recording paper conveyance path.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Shiozaki 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture Sharp Corporation (72) Inventor Hajime Nonaka 22-22, Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture Incorporated (56) References JP 61-100483 (JP, A) JP 61-46670 (JP, A)

Claims (1)

[Claims] 1. A recording apparatus for performing reciprocating movement of a recording sheet a plurality of times with respect to a recording head to perform a plurality of recording operations on one recording sheet, the front end of the recording sheet being sandwiched, A recording paper take-up unit for winding the recording paper is provided on the downstream side of the platen roller in the recording paper conveyance direction, and at the time of recording, a recording paper take-up unit control unit for rotating the recording paper take-up unit to take up the recording paper, and a recording paper take-up unit for recording. Recording head control means for pressing the recording head against the platen roller and driving the recording head, recording paper rewinding means for rewinding the recording paper wound around the recording paper winding section, and one recording paper Before starting the first recording operation, the recording paper take-up unit control unit is driven without driving the recording head control unit to temporarily wind up the unrecorded recording paper on the recording paper take-up unit, and then the winding operation is performed. And driving means to rewind the wound recording paper to the recording sheet take part, the recording apparatus characterized in that a recording sheet preliminary feeding means.