JPH0596718A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To obtain an appropriate recording density regardless of the carrying control of recording paper set by controlling the conduction start timing of a heater with timings corresponding to a plurality of carrying controls. CONSTITUTION:In case of manual feed, conduction is carried out with conventional timing (Conduction of a heater 21d is started upon start of reverse rotation of a paper feed motor) according to a conduction time indicated on a table. Ambient temperature is the detected, pulse conduction time is determined, and pulse conduction start is set at the start of reverse rotation of motor. In case of automatic paper feed, conduction start must be delayed as compared with manual paper feed on condition that the timing at the start of reverse rotation of paper feed motor is employed and thereby conduction start is delayed behind the start of reverse rotation of paper feed motor thus setting the heater to a recording position at the starting time of conduction with same timing as manual paper feed even in case of automatic paper feed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus, and more particularly to an ink jet recording apparatus for correcting the temperature of a recording head.

[0002]

2. Description of the Related Art Conventionally, a recording apparatus for recording on a recording medium such as paper or OHP sheet (hereinafter also referred to as recording paper or simply paper) has been proposed in the form of mounting recording heads of various recording systems. Has been done. The recording head may be of a wire dot type, a thermal type, a thermal transfer type, an inkjet type, or the like.

In particular, the ink jet system is a method of jetting ink directly onto a recording sheet, and therefore it is attracting attention as a quiet recording method with low running cost. The recording density of this ink jet recording system has temperature dependency, and the relationship between the recording density and the ambient temperature generally becomes lower as the temperature decreases, as shown in FIG. This is because when the temperature becomes low, the viscosity of the ink becomes large and the ejection amount of the ink decreases. Since an ordinary recording apparatus is set to have an appropriate density at room temperature (for example, 20 ° C.), the recording density becomes lower than the appropriate value in a low temperature environment.

Therefore, the temperature of the recording density is corrected so that an appropriate recording density can be obtained even in a low temperature environment. One method is to warm the ink at low temperature to prevent the viscosity of the ink from increasing.

FIG. 2A is a schematic sectional view of a head cartridge in which a recording head and an ink tank are integrated.
Reference numeral 21 is a heater board whose details are shown in FIG. 1B, and a discharge heater 21g is formed on a Si substrate. By applying a voltage to the discharge heater 21g, the ink in the common liquid chamber 23 formed by the heater board 21 and the top plate 22 obtains thermal energy and the discharge port 2
A droplet is discharged from 4 and recording is performed. Ink is supplied from the ink tank 25 to the common liquid chamber 23 through an ink supply pipe 26.

At this time, the heat retaining heater 21d is formed on the heater board 21 together with the discharge heater 21g, and the heat retaining heater 21d is appropriately heated and controlled, whereby the ink in the common liquid chamber can be heated and heated. Reference numeral 21e is a sensor for temperature detection, and the shaded portion indicates the position of the top plate mounted to form the common liquid chamber 23.

FIG. 3 is a graph showing an example of the relationship between the energization time and the amount of temperature rise of the ink temperature when the heat insulation heater is energized in pulses. As can be seen from the figure, the ink temperature can be temporarily raised to an appropriate temperature by selecting the pulse energization time.

Therefore, by detecting the environmental temperature and determining the energization time for raising the temperature of the ink by the temperature difference from the normal temperature (target temperature) from FIG. The temperature can be raised to room temperature.
At this time, the viscosity of the ink is the same as that at room temperature, and therefore by performing recording (that is, ink ejection) without delay, it is possible to obtain an appropriate recording density equivalent to that at room temperature.

For example, when the proper recording density is 20 ° C.,
If the environmental temperature is 10 ° C., the ink temperature rises 10 degrees to 20 ° C. by energizing the heat retention heater for 50 ms as shown in FIG. 3, so that an appropriate recording density can be obtained by quick recording.
In this way, the energization time to the heat retention heater at each environmental temperature can be determined as shown in FIG.

In the case of this control method, when the energization of the heat retention heater is finished, the ink temperature decreases with time due to heat dissipation, but when recording starts, the heat generation of the ejection heater suppresses the decrease in the ink temperature. Therefore, in the serial scanning type recording apparatus, it is common to energize the heat retention heater only once at the beginning of each recording line. In order to simplify the control, the energization timing of the heat retention heater at the beginning of each line is such that the heat retention heater is energized with the carrier stopped and the carrier is driven immediately after the end of energization, or the energization start of the heat retention heater is controlled to drive the carrier. It is synchronized with.

Note that, due to the limitation of the power supply capacity of the recording apparatus, it is often the case that the heat retention heater cannot be energized at the same time as the discharge heater. Therefore, when energizing the heat retention heater while the carrier is being driven, if the energization time is set too long, energization of the discharge heater may start and both may be energized at the same time. Therefore, in this case, it is necessary to end the energization time of the heat retention heater between the start of driving the carrier and the start of recording (that is, the start of energization of the discharge heater). Therefore, the energization time to the heat retention heater, that is, the amount of temperature rise of the ink is limited. When the amount of temperature rise of ink is insufficient and it is desired to energize for a longer time than this, the carrier is stopped by the insufficient amount to energize to compensate.

However, when energizing the heat-retaining heater with the carrier stopped, compared to the case where the temperature is not corrected,
It takes extra time for each row to turn on the heat insulation heater. Therefore, in order not to lengthen the time required for recording, it is desirable to energize the heat retention heater during carrier drive from the start of carrier drive to the start of discharge heater energization as much as possible.

Therefore, in order to shorten the energization time of the heat retention heater at the beginning of each line and improve the correction effect, the heat retention heater is energized a little longer before the first recording of each page to be recorded, There is also a control method that keeps the ink a little warm.

Even when the heat insulation heater is energized at the page head,
If recording control is interrupted during energization, it takes an extra time for the energization time, so it is desirable to energize at the same time during some recording operation.

Usually, at the start of recording of each page, in order to remove the backlash of the drive gear train of the recording medium (sheet), the recording sheet is first fed in the reverse direction and then forward by the required amount. A sheet feeding operation of aligning the positions of recording sheets is performed. Therefore, the energization timing of the heat retention heater at the page head is such that the energization start is synchronized with the reverse drive start of the recording sheet.

The purpose of heating the ink by energizing the heat-retaining heater at the page head is to preheat the head of each line rather than to raise the ink temperature to a target optimum temperature. It can be said that the area around the heat-retaining heater, including the above, is warmed once so that a certain amount of heat is spread, and the heating at the beginning of each line becomes smoother.

[0017]

Generally, a recording apparatus controls the drive of a sheet feeding motor for transporting and setting a recording sheet from the outside to a recording position in the recording apparatus. In many cases, there are a plurality of drive control methods. As a typical example, the paper feed control is performed after manually setting the recording paper to a predetermined position,
In some cases, the paper is manually fed, and in some cases, the recording paper is stored in the automatic paper feeding device, and the recording paper is taken out from the automatic paper feeding device and conveyed to the inside of the recording device.

First, drive control of the paper feed motor will be described for the above two examples.

FIG. 14 is a schematic cross-sectional view of the recording device 39 and the automatic paper feeding device 38 for explaining the conveyance control of the recording paper. The recording paper 33 is conveyed by the conveying roller 32a and the pressing rollers 34a and 34b in the recording device 39, and is conveyed by the conveying roller 32b and the pressing plate 35 in the automatic paper feeding device 38. The conveyance rollers 32a and 32b are driven and controlled by the same paper feed motor by a gear train (not shown).

First, in the case of manual feeding, the pressing of the pressing plate 35 of the automatic paper feeding device 38 against the conveying roller 32b is released, the leading edge of the recording paper is manually inserted from the gap to the position C in the drawing, and the conveying roller 32a is moved. By manually rotating it forward,
So that the position of the recording head 31 becomes the recording first line position,
The leading edge of the recording sheet is conveyed until it is aligned with the recording sheet setting position A for manual feeding. After that, in order to remove the backlash of the drive gear train of the conveying roller 32a by the recording command, first, the conveying roller 32a is reversed, and the recording sheet 33 is conveyed in the reverse direction until the leading edge of the recording sheet changes from position A to position E. To do. Then, the transport roller 32a is normally rotated again until the leading edge of the recording sheet returns to the position A, and the setting of the recording sheet is completed. After that, recording is started by the recording head 31. At this time, the time until the leading edge of the recording paper is fed back from the position A to the position E and then fed again to the position A is T
_Let it be _{A ms} .

Next, when the automatic paper feeder 38 is used, the conveying roller 32b is rotated in the forward direction according to the recording command.
Only one recording sheet is conveyed in the forward direction from the position B in the automatic sheet feeder 38. Here, the drive gear train of the carry roller 32b is provided with a one-way clutch, and when the paper feed motor is rotated in the reverse direction, the drive force is not transmitted to the carry roller 32b, and only the gear train turns from this. 1 by reverse operation
After the directional clutch is disengaged, the driving force is not transmitted to the transport roller 32b even if the paper feed motor is normally rotated again.

When the leading edge of the recording paper reaches the D position, which is past the C position, by the forward rotation of the carrying roller 32b, the carrying roller 32
Reverse the paper feed motor to disengage the one-way clutch in b. At this time, the leading edge of the recording sheet is fed back to the C position, but since the conveying force in the reverse direction to the recording sheet is lost at the C position as described above, the leading edge of the recording sheet is stopped at the C position. When the one-way clutch is disengaged due to the reverse rotation of the paper feed motor, the transport roller 32a is normally rotated to transport the leading edge of the recording paper from the position C to the position A, and the setting of the recording paper is completed. During the conveyance of the recording paper, the time from the reverse rotation of the paper feed motor to the normal rotation again to complete the setting of the recording paper is set to T _{B ms} .

In this case, since the backlash of the drive gear train of the conveying roller 32a is first removed when the leading edge of the recording paper is fed from the position C, the backlash removing operation is not required. The one-way clutch is disengaged because if left as it is, the next recording sheet is continuously conveyed after the conveyed recording sheet passes the conveying roller 32b.

In the conventional example, when the heat insulation heater is energized at the page head, the energization start timing is set at the same time as the reverse rotation start of the paper feed motor. Further, assuming that the normal recording is often performed from the recording first row position, the time when the recording sheet is set to the recording first row position, that is, the time when the leading edge of the recording sheet is conveyed to the position A in FIG. Is set as the target time, and the energization time to the heat retaining heater at the page is determined so that the preheating effect is appropriate at this target time. While energizing the heat retention heater, raise the temperature of the ink once,
Thereafter, the temperature is naturally lowered by heat dissipation, so that the preheating effect occurs. However, if the time after the end of energization becomes long at this time, the preheating effect disappears. In addition, this time differs depending on the time for energizing the heat retention heater.
Therefore, in the case of manual feeding, since T _{A ms} is from the start of energization of the heat retention heater to the target time, the energization time is set for each environmental temperature so that the energization time and the heat radiation time are appropriate for each environmental temperature, for example. I can decide. FIG. 5A shows the drive timing of the paper feed motor and the energization timing of the heat retention heater at this time.

Next, when the automatic paper feeder is used, the energization of the heat retention heater is started by the reverse rotation start of the paper feed motor, and the timing in this case is as shown in FIG. 5 (B).

Here, the time from the reverse rotation start of the paper feed motor until the paper reaches the recording first line position is T _{A ms in} the case of manual feeding and T _{B ms in} the case of using the automatic paper feeding device. Generally different. Therefore, when the automatic paper feeder is used, if the energization time table FIG. 6 set for manual feeding is used, the result is as shown in FIG. 5B. Therefore, when the automatic paper feeding device is used, the time from the end of energization to the target time becomes longer than in the case of manual feeding, and there is a drawback that an appropriate preheating effect cannot be obtained.

In order to eliminate the above-mentioned drawbacks, when the automatic paper feeding device is used, energization control may be performed by a dedicated energization table different from that for manual feeding. However, in this case, it is necessary to newly determine the optimum energization time for each environmental temperature. Also,
R to store and memorize the extra power distribution table
It is necessary to increase the OM capacity. In this way, new problems arise.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an ink jet recording apparatus which can obtain an appropriate recording density regardless of the conveyance control of the recording paper set. To do.

[0029]

In order to achieve the above object, the ink jet recording apparatus of the present invention sets the recording paper set by controlling the energization start timing of the heat retention heater at timings corresponding to a plurality of conveyance controls. It is intended to obtain an appropriate recording density regardless of the conveyance control of.

[0030]

Embodiments of the present invention will now be described in detail with reference to the drawings.

(Embodiment 1) In the present embodiment, when the automatic paper feeder is used, the time from the start of energization of the heat retention heater to the setting of the recording paper at the recording first line position is the above in the case of manual feeding. By energizing the heat-retaining heater at the same timing as the time, the above-mentioned drawbacks of the conventional example are eliminated.

First, the control configuration of this embodiment will be described with reference to the block diagram of FIG. Reference numeral 10 denotes a CPU that performs energization control based on a program stored in the ROM 11, and the ROM 11 also stores the table and the like shown in FIG. 6 in addition to the program. 12 is a timer for obtaining various timings, 13 is a control circuit 13 for controlling the heat retaining heater 21d and the temperature sensor 14 for detecting the environmental temperature.
Is.

The recording head used in this embodiment has a structure for ejecting ink by utilizing the thermal energy from the ejection heater, as in the case described above with reference to FIG. Set the resistance of the heater 21d to 144
Since the driving voltage for heating is Ω ± 20Ω and 24 V, approximately 4 W of electric power can be output.

Next, the energization control of this embodiment will be described with reference to FIG.
This will be described with reference to the flowchart of FIG. First, in the case of manual feeding, at the same timing as that in the conventional case (that is, the energization of the warming heater is started by the start of the reverse rotation of the paper feed motor), the energization is performed according to the energization time of the table of FIG. This is to detect the environmental temperature in step S1, determine the pulse energization time from FIG. 6 in step S2, and set the pulse energization start to the reverse rotation start of the paper feed motor in step S3. Then, through step S4,
In step S5, the heater is pulse-energized.

Next, the case of using the problematic automatic paper feeder will be described. On the assumption that the timing of the reverse rotation start of the paper feed motor is used as the condition for starting the energization of the heat retention heater, in order to make the energization start the same as the case of manual feeding, when using the automatic paper feeder, It is necessary to send the start of energization rather than. Therefore, the reverse rotation start of the prerequisites That paper feed motor, T _B in step S6 -
When the energization start is delayed by T _{A ms} , the timing of the energization start time of the heat retention heater with respect to the set time of the recording sheet to the first row position of the recording sheet is also changed as shown in FIG. It can be the same as for manual feeding. Therefore, it is possible to prevent the recording density, particularly the recording density at the top of the page, from varying between the case of automatic paper feeding and the case of manual feeding.

(Embodiment 2) In the present embodiment, the energization timing of the heat retention heater with respect to the time (target time) when the recording paper reaches the recording first line position is the same in the case of manual feeding and the case of using the automatic paper feeder. In addition, energization of the heat retention heater is started at a timing such that the time from the end of energization to the target time is always the same time T _C ms.

FIG. 10 shows a flow chart of this embodiment, and FIG. 11 shows a timing chart when the environmental temperature is 10 ° C. and 15 ° C. In this case, since the energization timing of the heat retention heater is different from that of the first embodiment, the energization table of FIG. 6 is not appropriate. To decide.

Whether by manual feeding or by using an automatic paper feeding device, the time from that time to the start of energization is set for each environmental temperature based on the reverse rotation start timing of the paper feed motor in each case. Achieve control.

First, in the case of manual feeding, step S11,
If the energization time determined by the environmental temperature in S12 is X _ms , the reverse rotation of the paper feed motor is started in step S16.
_It suffices to start energization with a delay of _A - _TC- X _ms . On the other hand, in the case of the automatic paper feeder used to start the energization delayed by T _B -T _C -X _ms from reverse start of the paper feed motor in step S17.

As described above, the time from the end of energization to the target time can be made constant even if different paper feed control is performed, and as can be seen from FIGS. 6 and 12, the energization time is shorter than that of the first embodiment. That is, the input energy can be reduced.

(Embodiment 3) In Embodiments 1 and 2, the target time is set to the time when the recording paper reaches the recording first line position, as in the conventional example. This was based on the assumption that, in the general case, it would often be recorded from the first record position. However, in practice, recording may not be performed from the first line position due to the layout of characters and the like on the recording paper, and recording may be started by skipping the upper few lines. In this case, for the time required to feed the number of skipped lines,
Since the start of recording is later than the target time at which the correction effect is appropriate, the correction effect is weakened (falls in temperature) by an amount corresponding to the delay. This embodiment is intended to eliminate the above-mentioned drawbacks.

Assuming that the line on which the actual first line is recorded is the Nth line recording position on the recording paper, the top N-1th line is fed as a margin. Assuming that the time required to feed one line of paper is TD _ms , it takes (N-1) T _{D ms to} feed the blank line. That is, the actual start of recording is (N-
1) It will start by sending only T _{D ms} .

Therefore, in this case, in the timing chart of the second embodiment (FIG. 11), the target time is (N-1) T.
_This is equivalent to a delay of _{D ms} from the time of the recording first line position on the recording paper. That is, in the second embodiment, the target control can be achieved by uniformly delaying the heat retention heater energization timing by (N-1) T _{D ms} .

Therefore, in the present embodiment, as shown in the flow chart of FIG.
If it is a line, the pulse energization timing is uniformly delayed by (N-1) T _{D ms} in steps S26 and S27. As a result, the energization timing can be the same regardless of the recording start row, and the recording density can be made constant.

(Embodiment 4) In Embodiments 1 to 3, the reverse rotation start time of the paper feed motor is used as the calculation reference of the energization start timing of the heat retention heater in the case of manual feeding and the case of using the automatic paper feeder. Was there.

However, for example, in the case of manual feeding, it is possible to manually set the leading edge of the recording paper to the position C in FIG. 14 and convey the recording paper from that position to the position A by the paper feed motor in response to a recording command. At this time, if a gear train is used as a power transmission mechanism for driving the transport rollers, the reverse rotation of the paper feed motor is required for backlash removal. However, when a friction wheel or a friction belt is used for power transmission, or when the conveyance roller is directly driven without a gear or the like, it is not necessary to reverse the paper feed motor for removing the backlash. Therefore, the reverse rotation of the paper feed motor cannot be used for determining the energization timing of the heat retention heater.

In the present embodiment, even in the above case, the power supply timing of the heat retaining heater is the same both in the case of using the manual feed and the case of using the automatic paper feeder. In this embodiment, in the case of the paper feed control during manual feeding, the forward rotation start of the paper feed motor by the recording command is used as the calculation reference of the energization timing of the heat retention heater. In this case, if the time taken for the recording sheet to be conveyed from the C position to the A position is T _E , the first embodiment
In the case of manual feeding in 3, the energization start of the heat retention heater is first set to the forward rotation start of the paper feed motor, and then the time T _B is replaced with T _E , which can be applied as it is.

(Embodiment 5) In Embodiments 1 to 4, the drive control of the paper feed motor is used for the energization timing of the heat retention heater. In this embodiment, a recording paper detection sensor is provided at position D in FIG. Therefore, the power supply timing of the heat retention heater is the same in the case of manual feeding and the case of using the automatic paper feeding device.

In this case, the time from when the recording sheet is detected by the sensor at the position D to when the recording sheet is conveyed to the position A and the sheet setting is completed is T _{F ms in} the case of manual feeding, and T _{F in} the case of using the automatic sheet feeding. _{Assuming G ms} , in the first to fourth embodiments,
First, the energization start of the heat retention heater is set when the recording paper detection sensor detects the paper, and the time T _{A in} the case of manual feeding is replaced with T _F , and the time T _{B in} the case of using the automatic paper feeder is replaced with T _G. Can be applied.

As described above, according to the present embodiment, the energization control can be similarly performed regardless of the paper feed control without using the drive control timing of the paper feed motor.

(Embodiment 6) In the case of manual feeding, in which reverse rotation operation for backlash removal is unnecessary on the paper feeding mechanism,
It is also conceivable that the sheet is manually set at the position A of 4 and the recording is started by the recording command without carrying the recording sheet.

In this case, if the energization timing of the heat retaining heater is set as shown in the timing chart of FIG.
After all, it becomes possible to set the same timing as when using the automatic paper feeder. That is, in the case of manual feeding, the heat retention heater is energized according to the table of FIG. 12 in accordance with the recording command, and after waiting for T _{C ms} after the completion of energization, normal recording control is started. On the other hand, in the case of the automatic paper feeder used, if the energizing time obtained from the table of FIG. 12 is X _ms, starts energizing warmth heater from reverse start of the paper feed motor to T _B -T _C -X _ms time elapsed To do.

As described above, according to this embodiment, even when the reverse rotation operation is not performed, the energization control can be similarly performed regardless of the sheet feeding control.

In each of the above embodiments, the case of the manual feed and the automatic paper feeder is described as a representative case in which there are a plurality of control methods of the paper feed motor for setting the recording paper.

As another case, there may be a plurality of methods for controlling the paper feed motor even with the same manual feed. For example, when the recording paper is thick paper, postcards, or the like and has a large bending rigidity, it may be possible to stabilize the transportation by lowering the transportation speed. At this time, the conveyance speed, that is, the control of the paper feed motor is changed depending on the recording paper.

In this case, in each embodiment, the times T _B , T _E , and T _F in the case of manual feeding can be applied as they are, by considering them as variables that change according to the transport speed, not as constants.

As described above, according to each of the above-described embodiments, the energization timings of the heat retention heaters are the same,
Even if the recording paper set conveyance methods are different, the same pre-heating time table can be used to obtain the optimum preheating effect, so there is no need to decide the conduction time table for each conveyance method. The ROM capacity to be stored can be minimized.

In the above embodiment, the optimum recording density is set to 2
Although described as 0 ° C., this can be similarly applied any number of times. Further, although the lower limit of the correction temperature range is set to 10 ° C., this may be any number of times. Further, although the temperature rise change of the ink is described in FIG. 3 by the energization time of a single pulse, the same temperature rise change as in FIG. Is possible.

Further, in order to change the temperature rise of the ink, it is also possible to carry out pulse energization with an appropriate pulse width and change the energization voltage, and this method also has the same temperature rise change as in FIG. Available by guiding.

In addition, each of the above embodiments can be applied to all those in which the discharge amount of ink has temperature dependency, and an ink jet system such as an on-demand system or a continuous system which utilizes thermal energy or mechanical energy. Not only the method but also the solid ink method in which the solid is melted and ejected at the time of recording by the recording head unit may be used. Further, the heat-retaining heater may directly or indirectly heat the ink, and its type or installation site is not specified. Further, it is possible to raise the temperature of the ink by controlling the discharge heater so as not to discharge the ink, without providing a special heat-retaining heater.

Further, the recording head is not limited to the ink jet type, but other general recording heads such as a thermal head can be applied.

The present invention provides excellent effects particularly in a recording head and a recording apparatus of the type which utilizes thermal energy among the ink jet recording systems.

Regarding the typical constitution and principle, for example, US Pat. Nos. 4,723,129 and 47407.
What is done using the basic principles disclosed in the '96 patent is preferred. This method is a so-called on-demand type,
Although it can be applied to any of the continuous type, particularly in the case of the on-demand type, it can be applied to an electrothermal converter arranged corresponding to a sheet or a liquid path holding a liquid (ink). By applying at least one drive signal corresponding to the recorded information and giving a rapid temperature rise exceeding nucleate boiling, heat energy is generated in the electrothermal converter, and film boiling is caused on the heat acting surface of the recording head. As a result, one-to-one correspondence with this drive signal can be made and bubbles in the liquid (ink) can be formed, which is effective. Liquid (ink) is ejected through the ejection openings by the growth and contraction of the bubbles to form at least one droplet. It is more preferable to make this drive signal into a pulse shape, because the bubble growth and contraction are immediately and appropriately performed, so that the ejection of the liquid (ink) with excellent responsiveness can be achieved. This pulse-shaped drive signal is described in U.S. Pat. No. 4,463,359 and No. 43.
Those as described in 45262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise on the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the ejection port, the liquid passage, and the electrothermal converter (the linear liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned specifications, US Pat. No. 4,558,333, US Pat. No. 4,558,333, which discloses a configuration in which a heat acting portion is arranged in a bending region.
The structure using the specification of 459600 is also included in the present invention. In addition, Japanese Unexamined Patent Publication No. 123670/1984, which discloses a configuration in which a common slit is used as a discharge portion of a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy are disclosed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 138461/1984, which discloses a configuration in which the above is associated with the discharge portion.

[0065]

As described above, according to the present invention, by keeping the time from the end of energization of the heat retention heater to the start of recording regardless of the conveyance control of the recording paper set, the ink at the start of recording can be changed. Since the temperature can be set to the target temperature, the proper recording density can be obtained regardless of the conveyance control of the recording paper set.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between environmental temperature and recording density.

FIG. 2 is a diagram showing details of a head cartridge.

FIG. 3 is a graph showing a relationship between an energization time and an ink temperature rise amount when energizing a heat retention heater.

FIG. 4 is a correspondence table of environmental temperature and energization time when energizing a heat retention heater at the beginning of a line.

FIG. 5 is a timing chart showing a conventional energization timing.

FIG. 6 is a conventional correspondence table of environmental temperature and energization time.

FIG. 7 is a block diagram of a first embodiment.

FIG. 8 is a flowchart of the first embodiment.

FIG. 9 is a timing chart showing the energization timing of the first embodiment.

FIG. 10 is a flowchart of a second embodiment.

FIG. 11 is a timing chart showing the energization timing of the second embodiment.

FIG. 12 is a correspondence table of environmental temperature and energization time of the second embodiment.

FIG. 13 is a flowchart of Example 3.

FIG. 14 is a schematic cross-sectional view of a recording device and an automatic paper feeding device for explaining the conveyance control of the recording paper.

FIG. 15 is a timing chart of the sixth embodiment.

[Explanation of symbols]

 10 CPU 11 ROM 12 Timer 14 Temperature Sensor 21d Heat Retainer 30 Platen 31 Recording Heads 32a, 32b Conveying Roller 33 Recording Paper 34a, 34b Pressing Roller 35 Pressing Plate 36 Pressing Spring 37 Paper Pan 38 Automatic Paper Feeding Device 39 Recording Device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 9012-2C B41J 3/04 103 B

Claims (6)

[Claims] 1. An ink jet recording apparatus for recording on a recording medium using a recording head for ejecting ink, wherein heating means for heating the ink in the recording head by the energy of a drive signal supplied thereto and keeping it warm; Conveying means for conveying the recording medium to the recording start position by a plurality of conveying controls, and during the conveyance of the recording medium by the conveying means, supplying the drive signal to the heating means at a timing according to the plurality of conveying controls. An ink jet recording apparatus comprising: 2. The ink jet recording according to claim 1, wherein the supply unit controls the supply timing of the drive signal so that the time from the supply end timing of the drive signal to the recording start timing is constant. apparatus. 3. The ink jet recording apparatus according to claim 1, wherein the drive signal has a signal width that changes according to an environmental temperature or an ink temperature. 4. The ink jet recording apparatus according to claim 1, wherein the conveying unit conveys the recording medium by different conveyance controls for manual sheet feeding and automatic sheet feeding. 5. The supply means starts supplying the drive signal at a timing delayed by a timing corresponding to the plurality of transport controls with reference to a transport timing of the recording medium in the reverse direction. The inkjet recording apparatus according to claim 1. 6. The recording head is provided with a plurality of ejection openings for ejecting ink and corresponding ejections, and causes a state change in the ink due to heat, and ejects the ink from the ejection openings based on the state change. And a thermal energy generating means for forming flying droplets.
An inkjet recording apparatus for recording on any one of 1 to 5.