JP2925702B2 - Ink jet recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus that performs recording by discharging ink from a discharge port to a recording medium, and more particularly, to improving the performance of recording medium feed control. It relates to the intended inkjet recording apparatus.

[Prior Art] Conventionally, an ink jet recording apparatus performs recording of characters or images by discharging ink toward a recording medium from a discharge port using ink of one color or a plurality of colors. This is a feature not found in other recording apparatuses that can perform high-quality images with noise and can record information in a non-contact manner on many types in principle without selecting the material of the recording medium.

[Problems to be Solved by the Invention] However, there are few conventional inkjet recording apparatuses that can reliably convey many types of recording media. For example, there are various types of recording media that can be recorded by inkjet, such as plain paper such as recycled paper, or kraft paper, envelopes, and wrapping paper. There are differences, differences in size. Therefore, a conveyance failure may occur depending on the type of the recording medium, and the recording medium may not reach the registration position or the recording head position in one conveyance. When such a conveyance failure occurs, conventionally, the same jam processing as in the case of a normal paper jam has been performed immediately.

By the way, if the recording of the ink jet recording head is interrupted every time a conveyance failure occurs, the ink for the initial recovery must be wastefully discharged. In addition, the inspection requires labor. However, among the transport failures, in the case of paper feed failure, jamming in the recording area often does not occur, and in such a case, recording can be substantially continued without interruption. preferable.

In view of the above, it is an object of the present invention to automatically and effectively recover the transport function without interrupting the recording for the above-described defective feeding of the recording medium so that the recording is substantially continuously performed. An object of the present invention is to provide an ink jet recording apparatus that can perform the operation.

Means for Solving the Problems In order to achieve the above object, an invention according to claim 1 is an ink jet recording apparatus that performs recording on a recording medium using a recording head that ejects ink from a discharge port to the recording medium. A feeding unit that feeds the recording medium; a detecting unit that detects whether the recording medium has been conveyed to a registration position upstream of a recording position by the recording head by the feeding unit; Detecting means for detecting the recording medium in the vicinity of a head; and when the detecting means does not detect the recording medium during recording, the feeding of the feeding means is performed again, and the recording medium is moved to a recording position by the recording head. Control means for performing feed recovery control so that the recording medium is fed to the recording medium. Is not detected, the frequency of the drive pulse of the drive motor of the feeding means is reduced to increase the torque of the drive motor, and then the feeding means is once reversed to the feeding start position, and then the feeding is started again. It is characterized in that feed recovery control for rotating the feeding means in the forward direction is performed.

Here, display means for displaying the occurrence of a jam according to the instruction signal is provided, and the control means keeps the detection means even if the feed recovery control of the feed means is repeated one or more predetermined times. When the recording medium is not detected, a jam display instruction indicating that a jam has occurred can be given to the display means.

Further, after the control unit reverses the feeding unit to the feeding start position when the detection unit does not detect the detection, the control unit displays the display when the detection unit detects the presence of the recording medium. Control for instructing the means to display a jam can be performed.

Further, the control means rotates the driving motor when the detection means detects the recording medium after the control means rotates the feeding means in the feed recovery control and conveys the recording medium in the direction of the recording head. Control to restore the number can be performed.

Further, the recording head may include, as an element for generating energy for discharging the ink, an electrothermal converter for applying thermal energy for causing film boiling of the ink.

[Operation] In the present invention, when the detecting means for detecting whether or not the recording medium has been conveyed to the registration position immediately before the recording position by the recording head by the feeding means does not detect the recording medium at the time of recording, the feeding is performed. Means to perform feeding recovery control for feeding the recording medium to the recording position by the recording head again, so that recording is performed for a defective feeding of the recording medium or the like which is slippery with the conveying means. The transport function can be automatically and effectively restored without interruption, and recording can be substantially continued. Therefore, according to the present invention, it is possible to prevent the ink for the initial recovery from being wastefully discharged in the case of the feeding failure, and to use the manpower for the recovery inspection without waste. An improvement is obtained.

Further, in the present invention, when the detecting means does not detect the recording medium even after repeating the feed recovery control a predetermined number of times,
By issuing a jam display instruction to the effect that a jam has occurred for the first time, the probability of feeding recovery is increased, and a jam or a mere feeding failure is accurately distinguished and processed.

Further, in the present invention, after the detection of the conveyance of the recording medium by the detection means, if the detection means for detecting the size of the recording medium in the vicinity of the recording head is not detected, the feeding means is reversed to the feeding start position. By discharging the recording medium, it is possible to easily remove a recording medium that is inappropriate for recording.

Further, in the present invention, after the detection of the conveyance of the recording medium by the detection unit, when the detection unit does not detect, the torque of the drive motor of the feeding device is increased by decreasing the frequency of the drive pulse of the drive motor. From the above, by once performing reverse rotation of the feeding unit to the feeding start position, and then performing the feeding recovery control to rotate the feeding unit forward again, when the paper feeding is defective, the feeding is restarted with a high torque, Reliable conveyance can be performed for more types of recording media.

Further, according to the present invention, when the detection means does not detect, after the feeding means is reversed to the feeding start position, a jam display is performed when the detection means detects the presence of the recording medium. Accordingly, accurate paper jam detection can be performed.

Further, in the present invention, after the feeding means is rotated forward in the feed recovery control and the recording medium is conveyed in the direction of the recording head, when the detecting means detects the recording medium, the rotational speed of the drive motor is returned to the original. By performing the control, the conveyance recovery can be executed without substantially lowering the recording speed.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a basic configuration of an embodiment of the present invention. In this figure, A is a recording head that discharges ink from a discharge port to a recording medium. B is a feeding means for feeding the recording medium to the recording position by the recording head A. C is detection means for detecting whether or not the recording medium has been transported by the feeding means B to a registration position immediately before the recording position of the recording head A. D is a control for performing feed recovery control such that when the detection means C does not detect the recording medium at the time of recording, the feeding means B is again fed and the recording medium is fed to the recording position by the recording head A. Means.

Further, as a specific example, E is display means for displaying the occurrence of a jam in response to the instruction signal. When the detecting means C does not detect the recording medium even if the feed recovery control of the feeding means B is repeated once or plural times, the jam display indicates that a jam has occurred. An instruction is given to the display means E.

F is a detecting means for detecting the size of the recording medium near the recording head A. Then, after the detection of the conveyance of the recording medium by the detection means C, the control means D reverses the feeding means B to the feeding start position when the detection means F does not detect the recording medium, and discharges the recording medium. Further, after detecting the conveyance of the recording medium by the detecting means C, the control means D increases the torque by lowering the rotation speed of the drive motor of the feeding device B when the detecting means F does not detect the feeding medium. After the B is once reversed to the feeding start position, the feeding recovery control for rotating the feeding means B forward again is performed.

Further, as an example, when the detecting means C detects the presence of the recording medium after the feeding means B is reversed to the feeding start position when the detecting means F is not detected, , A control to instruct the display means E to display the jam.

Furthermore, preferably, after the feeding means B is rotated forward in the feed recovery control to feed the recording medium in the direction of the recording head A, the control means D preferably controls the drive motor when the detecting means F detects the recording medium. Control is performed to restore the rotation speed.

FIG. 2 shows an example of the structure of a so-called bubble jet (BJ) type color ink jet recording apparatus having an electrothermal converter as a discharge energy generating means as a preferred embodiment of the present invention.

In FIG. 2, a recording medium 1 such as a sheet of paper or a plastic sheet is placed on a sheet feeding tray 2 and driven by a sheet feeding LF (line feed) motor (see FIG. 5) described later. Paper is fed one by one by 3
Further, the paper is conveyed to the recording position by the ink jet recording head 6 while being synchronized by the pinch roller 4 and the paper feed roller (also referred to as a conveyance roller) 5. A PE (paper end) sensor lever 7 is provided near the upstream side of the pinch roller 4. When the leading end of the recording medium 1 pushes down the PE sensor lever 7, the PE photo sensor 8 at the lower end of the PE sensor lever 7 is activated. When the recording medium 1 is turned on and the rear end of the recording medium 1 passes through the PE sensor lever 7, the PE sensor lever 7 returns to the original state, and the PE photo sensor 8 is turned off. An optical reflection type paper width sensor 9 for detecting the lateral size (dimension) of the recording medium 1 is provided near the ink ejection port of the recording head 6, and the recording medium 1 passes through the paper width sensor 9. Thus, the actual paper width size of the recording medium 1 is detected. Reference numeral 10 denotes a paper pressing leaf spring for preventing the recording medium 1 from rising, and is disposed from the upstream to the downstream of the pinch roller 4. A guide shaft 11 is provided in front of the pinch roller 4 and the paper feed roller 5 in parallel therewith. The carriage 12 is reciprocated along the guide shaft 11 via a wire (not shown) by the output of a carriage motor (see FIG. 5).

The recording head unit 6 which is a BJ type inkjet head is mounted on the carriage 12. The recording head unit 6 is for color image recording, is arranged in the scanning direction, and is provided corresponding to each color ink of cyan (C), magenta (M), yellow (Y), and black (BK). Consists of a number of recording heads. A plurality of (e.g., eight) ink ejection ports are vertically arranged on a surface of each recording head facing the recording medium 1 at a predetermined interval (e.g., 0.8 mm).
Recording units arranged in rows are provided.

A plurality of ink ejection ports are formed at a predetermined pitch in the vertical direction on the surface of the recording head 6 facing the recording medium 1, and an electrothermal converter (heating resistor) of each ink ejection port is formed based on recording information. Is driven (electrically heated) to generate bubbles (bubbles) in the ink, a flying ink droplet is formed by the pressure at this time, and recording is performed while ink dots adhere to the recording medium 1 in a predetermined pattern. A circuit board of a driving circuit (driver) for driving in this manner is mounted on each recording head.

Further, a control unit including a control circuit (CPU) of the recording apparatus and a ROM, a RAM, and the like attached to the control unit are formed on a control board (not shown). (Not shown), a driving signal (heating voltage) for the electrothermal transducer is supplied to each recording head 6 via a heat driver together with driving sources for various motors and the like based on the designation signal and the data signal (recording information). Is applied.

The carriage 12 is provided with a cartridge lever 13 for adjusting the distance between the recording head 6 and the recording medium 1. The lever 13 is moved from a solid line position to a broken line position in FIG.
Alternatively, by changing from a broken line position to a solid line position, the sheet distance changes. Thereby, it is possible to cope with the recording medium 1 having a relatively large thickness. Recording head 6
Is discharged from ink tanks 14 (Bk, C, M, and Y) for each color provided at the lower part of the apparatus.

FIG. 3 shows the structure in the vicinity of the recording head 6 of FIG. 2 in detail. Here, reference numeral 15 denotes a platen that forms a conveyance path, and 16 denotes a paper discharge roller provided on the conveyance path on the downstream side of the recording head 6. The recording medium 1 is conveyed by a pinch roller 4 and a paper feed roller 5, and information such as a character image is recorded on a platen 15 by ink ejected from a recording head 6. (See Fig. 4).

FIGS. 4 (A) and 4 (B) show the entire appearance of the ink jet recording apparatus of FIG. 2. In particular, FIG. 4 (B) shows the position of the ink tank 14 by opening the lower front cover 17 of the apparatus. Things. In FIG. 4, reference numeral 18 denotes a discharge tray, and reference numeral 19 denotes an operation panel. The operation panel 19 attached to the outer case of the recording apparatus includes a key setting portion such as an online / offline switching key, a line feed key, a form feed key, a recording mode switching key, and some alarm lamps and a power lamp. And the like, and a display unit 20 including a warning lamp.

FIG. 5 shows a configuration example of a control system of the BJ type ink jet recording apparatus of FIG.

In FIG. 5, a CPU 21 in the form of a microprocessor is shown.
Are connected to a host device 41 such as a computer via an interface 22, and read from the host device 31 into a data memory 23, a recording information signal, a program memory 24 in the form of a ROM, and a working memory. The recording operation is controlled based on a program or data as shown in FIG. 6 or FIG. A PE photo sensor (referred to as a sheet sensor) 8 detects whether or not the recording medium 1 exists between the paper feed roller 3 and the paper feed roller 5 (FIG. 2).
The detection signal is transmitted to CPU 21.

The output from each of the operation keys 42 on the operation panel 19 described above is transmitted to the CPU 21 through the input port 27.
A control signal is supplied to 20 via an output port 28.

From the power supply circuit 29, a logic drive voltage VCC (5V) for operating the control logic circuit, various motor drive voltages V
M (30 V), reset voltage RESET, heat voltage (head voltage) VH (25 V) for heating the dot forming element (electrothermal transducer) of each recording head 6, and backup voltage VDDH for protecting the recording head 6 Is output. The heating voltage VH is applied to the recording head 6, and the backup voltage VDDH is applied to the head control circuit 30 and the recording head 6, respectively.

Further, the CPU 21 is connected to the driver circuit 32 through the output port 31.
The driver circuit 32 is connected to the paper feed roller 3, the paper feed roller 5, and the paper discharge roller 16 based on a control signal (command) supplied from the CPU 21 through the output port 31.
The drive of the LF motor 33, the clutch 34, and the load of the carriage motor 35 for reciprocating the carriage 12 are controlled. In particular, the driver circuit 32 of the present example can change the rotation speed and torque of the LF motor 33 and can change the rotation direction of the LF motor 33 by variably controlling the output pulse interval (frequency).

Hereinafter, an operation example of the color inkjet recording apparatus according to the present embodiment will be described with reference to FIGS. 6 and 7. FIG.

As shown in FIG. 6, prior to sheet feeding, first, the carriage motor 35 is driven to move the carriage 12 to the home position at the right end (step S1). Next, the clutch 34 connecting the LF motor 33 and the paper feed roller 3 is turned on (on) (step S2), and the LF motor 33 is driven at a predetermined n1 pulse frequency to move the paper feed roller 3 in the paper feed direction. Rotate forward (Step S
3).

Subsequently, the output of the PE photosensor 8 is turned on to determine whether or not there is paper, that is, whether or not the recording medium 1 has been conveyed to the pinch roller 4.
It is determined by whether or not (step S4). In the case of a negative determination (NO), a jam process such as displaying a jam on the display 20 may be performed immediately. However, it is preferable that the paper feed roller 3 be further rotated in the normal direction so that steps S2 to S4 or S3 are performed. The operation of S4 is repeated once or a plurality of predetermined times (for example, three times).
If a negative determination is made, jam processing is performed.

On the other hand, if the determination in step S4 is affirmative (YES), it is determined whether or not the recording medium 1 has been fed by a predetermined amount based on the detection output of the presence or absence of the paper by the paper width sensor 9 (step S5).
When the determination is affirmative, the process proceeds to a normal printing operation for driving and scanning the print head 6 and the carriage 12. In the case of a negative decision,
The LF motor 33 is rotated in the reverse direction by the drive pulse of n2 (for example, n2 is a pulse that is relatively slower than n1), and the paper feed roller 3 is rotated in reverse (step S6). As a result, the recording medium 1 passes through the PE sensor lever 7 when the conveyance amount is simply insufficient, but cannot pass normally when a jam (paper jam) occurs. Therefore, it is next determined whether or not there is no paper based on whether or not the output of the PE photosensor 8 is OFF (step S7). If a negative determination is made, it is determined that a jam has occurred and jam processing is performed. If the determination is affirmative, the paper feed roller 3 is further rotated in the reverse direction to discharge the recording medium 1 to the paper feed tray 2 side, and an error message such as paper quality failure is displayed on the display 20.

FIG. 7 shows a control procedure of the sheet feeding operation according to the second embodiment of the present invention. The control operation in the preceding stage in the present embodiment is the same as that from step S1 to step S6 in FIG. 6, and step S11 in FIG. 7 is a branch A of the negative determination (NO) of step S6 in FIG.
Connect to

In this example, when the paper width sensor 9 detects no paper after the PE photosensor 8 detects paper (from step S1 in FIG. 6).
S6), the frequency of the drive pulse of the LF motor 33 is reduced through the motor drive driver circuit 32, and the
The torque of 33 is increased (step S11). Next, LF
After the paper feed roller 3 is rotated in reverse by the drive of the motor 33 (step S12), it is then determined whether or not there is no paper based on whether or not the output of the PE photo sensor 8 is OFF (step S13). Judgment processing is performed by judging occurrence. If the determination is affirmative, the LF motor 33 is driven to rotate the paper feed roller 3 forward in the paper feed direction (step S14).

Subsequently, the output of the PE photosensor 8 is turned on to determine whether or not there is paper, that is, whether or not the recording medium 1 has been conveyed to the pinch roller 4.
It is determined based on whether or not (step S15). In the case of a negative determination (NO), a jam processing such as displaying a jam on the display 20 may be performed immediately, but preferably the paper feed roller 3
Is rotated forward, and the operations in steps S14 and S15 are performed once or a plurality of predetermined times (for example, three times).
Repeat), and if the determination is still negative in step S15, jam processing is performed.

On the other hand, if the determination in step S15 is affirmative (YES), it is determined whether or not the recording medium 1 has been fed by a predetermined amount based on the detection output of the presence or absence of the paper by the paper width sensor 9 (step S1).
6). When the determination is affirmative, the frequency of the drive pulse of the LF motor 33 is returned to the original high frequency (step S1).
7), proceed to a normal printing operation for driving and scanning the print head 6 and the carriage 12. When a negative determination is made, it is determined that a jam has occurred and jam processing is performed.

(Others) The present invention brings about an excellent effect particularly in a bubble jet type recording head and a recording apparatus proposed by Canon Inc. among ink jet recording methods. This is because according to such a method, it is possible to achieve higher density and higher definition of recording.

As for the representative configuration and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4,740,796. This method can be applied to any of the so-called on-demand type and continuous type. In particular, in the case of the on-demand type, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). Applying at least one drive signal corresponding to recording information and providing a rapid temperature rise exceeding nucleate boiling to the electrothermal transducer, thereby causing the electrothermal transducer to generate heat energy, and This is effective because a film in the liquid (ink) corresponding to the driving signal can be formed one by one by causing film boiling on the heat acting surface. The liquid (ink) is ejected through the ejection opening by the growth and contraction of the bubble to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of a liquid (ink) having particularly excellent responsiveness can be achieved, which is more preferable. U.S. Pat. No. 44
Those described in JP-A-63359 and JP-A-4345262 are suitable. Further, if the conditions described in US Pat. No. 4,313,124 relating to the invention relating to the temperature rise rate of the heat acting surface are employed, more excellent recording can be performed.

As a configuration of the recording head, in addition to a combination configuration (a linear liquid flow path or a right-angled liquid flow path) of a discharge port, a liquid path, and an electrothermal converter as disclosed in the above-mentioned specifications, A configuration using U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459,600, which disclose a configuration in which is disposed in a bending region, is also included in the present invention. In addition, Japanese Unexamined Patent Publication No. 59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy is provided. The effect of the present invention is effective even if the configuration is based on JP-A-59-138461, which discloses a configuration corresponding to a discharge unit. That is, according to the present invention, recording can be reliably and efficiently performed regardless of the form of the recording head.

Further, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium on which a recording apparatus can record. Such a recording head may have a configuration that satisfies the length by a combination of a plurality of recording heads, or a configuration as one integrally formed recording head.

In addition, even with the serial type printer as in the above example, the recording head fixed to the main unit or attached to the main unit enables electrical connection with the main unit and supply of ink from the main unit. The present invention is also effective when a replaceable chip type print head or a cartridge type print head having an ink tank provided integrally with the print head itself is used.

Further, it is preferable to add recovery means for the print head, preliminary auxiliary means, and the like provided as a configuration of the printing apparatus in the present invention since the effects of the present invention can be further stabilized. If these are specifically mentioned, capping means for the recording head, cleaning means, pressurizing or suction means, preheating means using an electrothermal transducer or another heating element or a combination thereof, Performing a preliminary ejection mode in which ejection is performed separately from printing is also effective for performing stable printing.

Regarding the type or number of print heads to be mounted, for example, in addition to one provided for single color ink, a plurality of print heads are provided corresponding to a plurality of inks having different print colors and densities. May be used. That is, for example, the printing mode of the printing apparatus is not limited to the printing mode of only the mainstream color such as black, but may be any of integrally forming the printing head or a combination of a plurality of printing heads. The present invention is also extremely effective for an apparatus provided with at least one of full colors by color mixture.

In addition, in the embodiments of the present invention described above, the ink is described as a liquid. However, an ink that solidifies at or below room temperature and softens or liquefies at room temperature, or the ink itself in an inkjet method. In general, the temperature is controlled within a range of 30 ° C. or more and 70 ° C. or less to control the temperature so that the viscosity of the ink is in a stable ejection range. I just need. In addition, the temperature rise due to thermal energy can be positively prevented by using it as energy for changing the state of the ink from a solid state to a liquid state, or ink that solidifies in a standing state to prevent evaporation of the ink can be used. In any case, the ink is liquefied by the application of the thermal energy according to the recording signal, and the ink is liquefied, and the liquid ink is discharged. The present invention is also applicable to a case where an ink that liquefies for the first time by energy is used. The ink in such a case is disclosed in
No. -56847 or JP-A-60-71260, while being held as a liquid or solid substance in a porous sheet recess or through hole, facing the electrothermal converter. It is good also as a form. In the present invention,
The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition, the form of the ink jet recording apparatus of the present invention may be used as an image output terminal of an information processing apparatus such as a computer, a copying apparatus combined with a reader or the like, or a facsimile apparatus having a transmission / reception function. Or the like.

[Effects of the Invention] As described above, according to the present invention, the following effects can be obtained.

In the present invention, when the detecting means for detecting whether or not the recording medium has been conveyed to the registration position immediately before the recording position by the recording head by the feeding means does not detect the recording medium at the time of recording, the feeding of the feeding means is performed. Feed recovery control for feeding the recording medium to the recording position by the recording head by re-executing the recording medium is performed. The conveyance function can be automatically recovered effectively, and the recording can be made substantially continuous. Therefore, according to the present invention, it is possible to prevent the ink for the initial recovery from being wastefully discharged in the case of the feeding failure, and to use the manpower for the recovery inspection without waste. An improvement is obtained.

Further, in the present invention, when the detection means does not detect the recording medium even after repeating the above-described feed recovery control a predetermined number of times, the jam recovery instruction is issued for the first time to indicate that a paper jam has occurred, so that the probability of feed recovery can be improved. Is increased, and a jam or a mere feeding failure is accurately distinguished and processed.

Further, in the present invention, after the detection of the conveyance of the recording medium by the detection means, if the detection means for detecting the size of the recording medium in the vicinity of the recording head is not detected, the feeding means is reversed to the feeding start position. By discharging the recording medium, a recording medium unsuitable for recording can be easily removed.

Further, in the present invention, after the detection of the conveyance of the recording medium by the detection unit, when the detection unit does not detect, the torque of the drive motor of the feeding device is increased by decreasing the frequency of the drive pulse of the drive motor. From the above, by once performing reverse rotation of the feeding unit to the feeding start position, and then performing the feeding recovery control to rotate the feeding unit forward again, when the paper feeding is defective, the feeding is restarted with a high torque, Reliable conveyance can be performed for more types of recording media.

Further, according to the present invention, when the detection means does not detect, after the feeding means is reversed to the conveyance start position, a jam display is performed when the detection means detects the presence of the recording medium. It is possible to detect a paper jam accurately.

Further, in the present invention, after transporting the recording medium in the direction of the recording head by rotating the feeding means in the above-described feeding recovery control,
When the detection unit detects the recording medium, by performing control to return the rotation speed of the drive motor to the original state, it is possible to execute conveyance recovery without substantially lowering the recording speed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an example of an internal configuration of an ink jet recording apparatus according to an embodiment of the present invention, and FIG. 4A and 4B are perspective views showing an example of the overall appearance of the ink jet recording apparatus of the embodiment of the present invention shown in FIG. 2, and FIGS. FIG. 6 is a block diagram showing a circuit configuration of a control system of the apparatus shown in FIG. 2, FIG. 6 is a flowchart showing a processing procedure of one embodiment of the present invention, and FIG. It is a flowchart which shows a processing procedure. DESCRIPTION OF SYMBOLS 1 ... Recording medium, 2 ... Paper feed tray, 3 ... Paper feed roller, 4 ... Pinch roller, 5 ... Paper feed roller, 6 ... Recording head, 7 ... PE sensor lever, 8 ... PE Photo sensor, 9 ... Paper width sensor, 10 ... Paper holding plate spring, 11 ... Guide shaft, 12 ... Carriage, 20 ... Display, 21 ... CPU, 23 ... Data memory, 24 ... Program memory, 34 ... clutch, 35 ... carriage motor, 41 ... host device.

Continuation of the front page (72) Inventor Makoto Takemura 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Tetsuji Kurata 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Kazuhiko Shinoda 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Koichiro Kawaguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (58) Survey Field (Int.Cl. ⁶ , DB name) B65H 1/00-3/68

Claims (5)

(57) [Claims] 1. An ink jet recording apparatus which performs recording on a recording medium using a recording head which discharges ink from a discharge port to the recording medium, comprising: a supply unit for supplying the recording medium; Detecting means for detecting whether or not the recording medium has been conveyed to a registration position upstream of a recording position by the recording head; detecting means for detecting the recording medium in the vicinity of the recording head; Control means for performing feeding recovery control so as to cause the feeding means to perform feeding again when the means does not detect the recording medium and to feed the recording medium to a recording position by the recording head. After the detection of the conveyance of the recording medium by the detection unit, the control unit drives the drive motor of the feeding unit when the detection unit does not detect the conveyance. After the torque of the drive motor is increased by lowering the frequency of the lubrication, the feed means is once reversely rotated to a feed start position, and then the feed recovery control is performed to rotate the feed means forward again. Inkjet recording apparatus. A display unit for displaying the occurrence of a jam in response to an instruction signal, wherein the control unit detects the detection even if the feed recovery control of the feed unit is repeated once or a plurality of predetermined times. 2. The ink jet recording apparatus according to claim 1, wherein when the means does not detect the recording medium, a jam display instruction indicating that a jam has occurred is issued to the display means. 3. When the control means reverses the feeding means to a feeding start position when the detection means does not detect the detection, and when the detection means detects the presence of the recording medium, 3. The ink jet recording apparatus according to claim 2, wherein control is performed to instruct the display means to display a jam. 4. The control means controls the drive when the detecting means detects the recording medium after the control means rotates the feeding means in the feed recovery control and conveys the recording medium in the direction of the recording head. 2. The ink jet recording apparatus according to claim 1, wherein control for restoring the number of rotations of the motor is performed. 5. The recording head according to claim 1, wherein the recording head includes an electrothermal transducer as an element for generating energy for discharging the ink, for applying thermal energy for causing film boiling of the ink. The inkjet recording apparatus according to claim 1.