JPS5896574A - Delivery system of recording medium in transfer type heat-sensitive recorder - Google Patents

Abstract

PURPOSE:To relieve the distortion of recorded images by suppressing the delay of the delivery of ink doner sheets and recording papers to minimum by a method in which the ink doner sheets are fed by driving both a pressure roller and a drive roller. CONSTITUTION:When the tip of a recording paper 13 reaches near a thermal head 3, a step motor 7 begins to operate and a pressure roller 4 and a drive roller begin to turn with the same peripheral speeds. With the operations, an ink doner sheet 12 put between the pressure roller 4 and the thermal head 3 and also between the drive roller 5 and a pinch roller 6 is started to feed. Thus, the time from the beginning of driving the step motor to the beginning of feeding the ink doner sheet is shortened to about 1/2 of the conventional one and the ink doner sheet 12 is fed by both the rollers 4 and 5 concurrently at the same periphral speeds, so that the elogation of the sheet 12 is avoided and the distortion of recorded images is relieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for conveying a recording medium used in a transfer thermal recording device. The figure used for recording image information shows the conveyance system of a thermal recording device that uses thermal recording paper.
- Wrap it in a loop shape and supply it - the loop is attached
When the installation of the supply roll 140 is completed, the electric recording paper 8 that has been released is passed between the thermal roller 3 and the pressure roller 240, and between the drive roller 5 and the pinch roller 60 threshold. The relationship between the motor shaft 1m of the step motor 0, which starts driving the step motor at the beginning of the 0 brass operation 01lII when the setting of 0 ends, and the pulley directly connected to the shaft 5AK of the drive roller 5 is as follows. A toothed belt 9 is hooked up. Accordingly, the step number 7 was driven, and the thermal recording paper that was pinched 4 and 6 was used as the drive boot 5KJE*:
is transported in the direction of the arrow, and the thermal head 30 is driven, and thermal recording is performed on the thermal recording paper 2, which is pushed by the heating element of the head by the pressure roller 4. .

82 is a friend of the ink donor sheet conveyance system in a conventional transfer type thermal recording apparatus to which the &conveyance layer jlt is applied as is. Transfer-type thermal recording devices use an ink donor sheet (hereinafter referred to as an ink donor sheet) that is fluidized and sublimated by heating, and selectively transfers the ink to recording paper (plain paper) to print the image. Record information.

Therefore, this apparatus is provided with an ink donor sheet (roll-shaped supply roll 11). Supply roll 11
The friend ink donor sheet 12 is fed out between the thermal head 3 and the pressure roller 4! The 0 step motor 7 is superimposed on the recording paper 13 along with the IK.
When the reink donor sheet 12 is conveyed in the direction of the arrow by the drive of The ink donor sheet 12 is peeled off by a peeling means (not shown), and is discharged onto a sheet discharge tray (not shown).

However, in such a conventional transfer heat-sensitive recording device, when attempting to write diagonal lines 15 on the document 14 as shown in FIG. The correct diagonal line 16 was not re-fjIAed, and a distorted diagonal line 17 was reproduced. The following two points are considered to be the reason why the image is distorted in this way.

(1) This is due to a delay in the start-up of the conveyance system itself.O This is due to the slight elongation of the toothed belt at startup, but the main cause is the drive roller 01110. ◎1llllJ diagram shows the drive Roller deflection) t - For illustrative purposes only. Even when the step motor starts to drive and the shaft 5A simultaneously starts one revolution in the direction of the arrow, the outer periphery of the drive roller 5 remains stationary until enough force is applied to convey the ink donor sheet 12. In other words, the conveyance operation of the ink donor sheet 12 is delayed until the rubber row 251011 is deflected, for example, as shown by the dotted line.

(1) Due to the elongation of the ink donor sheet, if the base paper in contact with the thermal head is not thin enough, thermal pulses may be applied to the ink layer. Therefore, if a thin ink donor sheet is conveyed by dry blowing, sufficient conveyance will not occur until a certain degree of elongation occurs.

FIG. 5 shows the movement of the ink donor sheet and recording paper on the heating element of the thermal head due to the above reasons. Even if the axis of the drive roller moves linearly over time, as shown by the dashed line, there will be a delay in conveyance of the ink donor sheet and the recording paper, as shown by the solid line 19. When the recording operation is completed, the rotation of the drive roller and the elongation of the ink donor sheet are restored to their original state. Therefore, each time a recording operation is started, the recorded image is subject to the above-mentioned distortions. It is an object of the present invention to provide a recording medium conveying method that can reduce distortion of recorded images in a transfer type thermal recording device that performs recording by intermittent driving for each sheet. , the movement of the ink donor 7-t (by driving the pressure roller which has been set to tIII and causing the ink donor seat to be carried out by both the drive roller and the drive roller), and the m-stroke of each individual i-ra. Also, by driving the pressure roller, the elongation of the ink donor sheet on the heating element of the thermal head is reduced.Thus, the delay caused in the conveyance of the inter-donor sheet and recording paper is kept to a minimum. , to achieve the above-mentioned purpose.
The following figure 0IK6 shows the ink donor 7-t transport system of the transfer lid thermal recording device of this embodiment.
In this device, a step motor 7 is arranged at the pressure point 4, and a drive roller for conveying the ink donor 120 with respect to the path that the ink donor 120 travels. Between the drive shaft 8 and the step motor shaft 7A, which is directly connected to the 0 drive shaft SO shaft located in the 5 motor 0 III, there is a
The first toothed belt 21 is connected directly to the shaft of the glare roller 40, and connected to the pulley 22 and the electric lIk.
The diameter of the zero pulley 22, on which the second toothed belt 23 is passed between the machine shaft 7A, is Brella shallow 240.
The circumferential speed is selected to be equal to that of the drive roller 5.

In a transfer type thermal recording device having such a configuration, when a start button (not shown) is pressed to start recording,
The recording paper 13 is also supplied from a paper feed tray (not shown). When the leading edge of the recording paper 13 reaches the vicinity of the thermal head 3, driving of the step motor 7 is started at this timing. As a result, the pressure roller 4 and the drive roller 5 start rotating at the same circumferential speed. At the same time, the ink donor sheet 12, which is held between the pressure roller 4 and the thermal hept 3 and between the drive roller 5 and the pinch roller 6, starts to be conveyed by the rotational driving force at these two points. At this time, the stress between the contact points of the pressure roller 4 and the drive roller 5 with the ink donor seat 12 and the shafts of these O rollers is divided into two by these two rollers. Therefore, the step motor is driven. From International Donor 7-
The time it takes to start transporting the sheets is reduced by approximately half -Kml compared to the conventional oil storage.

Furthermore, in this device, the pressure roller 4 and the drive roller S convey the ink donor sheet 12 simultaneously and at the same circumferential speed, so the tension of the ink donor sheet 12 does not become high between these rows 20. . In other words, the elongation of the ink donor Zitro, which stops at the start of conveyance, occurs at this cylinder location, so it is 1%A.

Interdonashi) 1! When the printing starts, the leading edge of the recording paper 130 is sandwiched between the outer periphery of the printer sheet 14 and the ink donor sheet 12, and as the printer sheet 12 moves, the heating head s of the thermal head 30 is driven. The image information is transferred onto the recording paper 13 by selectively applying heat pulses. When the recording progresses and the rear end of the recording head 11M13 passes between the thermal head 3 and the shutter shallow 240, the recording operation ends and the driving of the stepper 7 is stopped. From this point on, the conveyance of the ink donor sheet 12 is stopped, and the state is awaited for the next start of fI&. The recorded recording paper 13 is ejected to an ejection tray (also not shown) by an ejection mechanism (not shown). As explained above, according to the present invention, since the interdoner sheet is conveyed by two rollers, 04, Figure @ (D Easy ** f!
4 Figure 111 is a schematic configuration diagram showing the main parts of the recording paper conveyance system of a thermal recording device using thermal paper, and the 2nd m is an ink donor seam)
Figure 3 is a plan view showing an example of the image information on the Ad manuscript; Fig. 4 is an explanatory diagram to explain the cause of image distortion and the drive roller ** for 1. Fig. 6 is a plan view showing one part of the recording paper shown in Figure 2. A characteristic diagram showing the relationship between the tribo-201 rotation and the movement of the ink donor sheet and the recording paper. FIG. 6 shows the main part of the interdonor sheet conveyance system of the transfer type thermal recording device in the present @〇1 embodiment. This is a schematic diagram of the configuration. Recording medium) 13 - Recording paper Applicant Fuji Xerox Co., Ltd. Representative Patent Attorney Umeo Yamauchi #7f Figure #y 2 Figure JL J Figure

Claims (1)

[Claims] A pressure roller that presses a long recording medium unraveled from a supply roll against a thermal head together with recording paper to perform thermal transfer recording, and a drive roller and a pinch roller that press the recording medium that has passed the pressure roller from both sides. The transfer deaf thermal recording apparatus [AII] is equipped with a driving means for rotationally driving the pressure roller and the drive roller at the same circumferential speed at the same time, and continuously conveys the recording medium by both the pressure roller and the drive roller. Let's do t% mold,
Recording medium conveyance method of transfer type thermal recording device 0