JP2006007716A - Recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the ink scumming in a reversal device from being transferred to a recording medium while shortening the time for printing. <P>SOLUTION: The recorder, by which a recording operation can be performed by either one-sided recording or both-sided recording for the recording medium, is equipped with a recording means by which an ink is discharged according to signals, a conveying means by which the recording medium is conveyed at performing the one-sided and both-sided printing and a control making a tilt correcting means at the time of a surface feed and a rear face feed different when the both-sided recording is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image recording apparatus that records an image by adding a colorant to a recording medium according to image data, and more particularly to an image recording apparatus that enables recording on both sides of a recording medium.

  With the spread of information processing equipment such as copying machines, word processors, computers, and communication equipment, digital images are recorded by an inkjet method as one of output devices for image formation (recording) of those equipment. Inkjet recording apparatuses are rapidly spreading. In such a recording apparatus, in order to improve the recording speed, a recording head in which a plurality of ink discharge nozzles are integrated and arranged uses a plurality of ink discharge ports and a plurality of liquid passages. As the number of recording heads has increased, many of them have a plurality of recording heads simultaneously.

  The ink jet recording method performs dot recording by causing ink, which is a recording liquid, to land on a recording medium such as paper as flying droplets, and is low-noise because it is a non-contact method. In addition, high-resolution and high-speed recording is possible by increasing the density of the ink discharge nozzles, and even for recording media such as plain paper, no special processing such as fixing is required, and high-quality images can be produced at a low price. In recent years, its use has become widespread because it can be obtained. In particular, an on-demand type ink jet recording apparatus is promising for future demand because it can be easily colored and the apparatus itself can be miniaturized and simplified. In addition, user applications have been diversified, and various types of apparatuses have been put into practical use. As an example, there is a recording apparatus including a double-sided recording mechanism that enables recording on both sides of a recording medium.

  In a recording apparatus equipped with such a double-sided recording mechanism, first, ink is applied to the front surface (first recording surface) of the recording medium to perform recording on the front surface, and then the recording medium is turned over to reverse the second surface (second recording surface). In general, recording is performed on the recording surface.

  However, when the recording paper on which the front surface recording has been performed is reversed, the ink applied to the front surface comes into contact with the transport path and stains the inside of the path. In particular, a large amount of dirt adheres to the conveying roller in the reversing mechanism (hereinafter referred to as “reversing roller”). The contamination-reversing reversing roller is brought into contact with the paper surface of the recording paper to cause transfer contamination, and the recording paper surface becomes dirty. In order to prevent transfer stains, it is only necessary to start reversal after the ink applied to the surface is completely fixed, but the time is long, especially when pigment ink is used, more standby time is required. turn into. Therefore, there is a problem that the throughput is significantly lowered or an insufficient waiting time is set to prevent the throughput from being lowered, and when the recording medium with a large amount of ink applied is reversed, the reversing mechanism becomes dirty and transferred to the recording paper. was there.

  As a conventional solution to the above-mentioned problem, there is one that reduces the dirt in the reversing mechanism by comparing the print duty of odd-numbered pages and even-numbered pages and recording the lower print duty first (on the surface) (for example, , See Patent Document 1). In some cases, the standby time is set according to the height of the printing duty on the front surface, and the reversal is started after the ink is fixed (for example, see Patent Document 2).

  In Patent Document 1, the printing duty of odd-numbered pages and even-numbered pages are compared, and the lower printing duty is recorded first (on the front surface) to reduce the contamination in the reversing mechanism. However, this requires an operation of rearranging the pages after the recording of the print job for a plurality of pages is completed, and the user is burdened with a new operation. Also, there is no effect when the printing duty is high on both sides.

On the other hand, in Patent Document 2, a standby time corresponding to the duty of the ink applied to the surface is set, and the reversing operation is started after the ink on the surface is fixed. However, since it takes time to fix the ink, there is a problem that the throughput is lowered when printing a large amount of ink applied.
Japanese Patent Laid-Open No. 10-324038 JP 2003-048411 A

  As described above, conventionally, it is necessary to fix the ink completely after surface recording of double-sided recording, and it is necessary to cause the user to rearrange the pages, or the throughput is reduced due to the occurrence of waiting time. It is. In the current situation where higher speed and higher quality are increasingly demanded, it is desirable to reduce the recording time by eliminating the waste of the above work and the waiting time.

  Ink stains adhering to the reversing roller are transferred by being pressed against the surface of the recording paper, and are easily transferred when the pressing force is increased. The pressure contact force becomes strongest when the skew correction of the recording paper is performed. If skew correction is performed so as to reduce the pressure contact force, ink stains adhering to the conveyance roller in the reversing mechanism are not transferred to the recording medium.

  The present invention has been made in view of the above problems, and when performing double-sided recording, the ink stain in the reversing device is not transferred to the recording medium, and the time required for printing can be shortened. An object is to provide a possible image recording apparatus.

  In order to achieve the above object, the present invention is a recording apparatus capable of recording on a recording medium by one-sided recording or two-sided recording, and a recording unit that performs recording by discharging ink according to a signal. , Having a conveying means for conveying the recording medium during single-sided and double-sided recording, and a control in which the skew feeding correcting means at the time of front-side feeding and back-side feeding is different during double-sided recording It is.

  A second invention according to the present application is characterized in that the skew feeding correction means is such that the pressure received by the recording medium from the transport means during back side skew correction is smaller than the pressure received during front side skew correction. is there.

  The third invention according to the present application is characterized in that the skew correction means performs at least one skew correction means at the time of feeding the front surface and does not perform the means of skew correction at the time of feeding the back surface. It is what.

  According to a fourth aspect of the present application, the skew feeding correcting means is a means for abutting the recording medium against a pair of conveying rollers rotating in a direction opposite to the paper feed roller and the recording medium reversing roller, and the abutting thereof It is characterized in that the amount is smaller at the time of back side feeding than at the time of front side feeding.

  According to a fifth aspect of the present application, the skew feeding correction unit is a unit that abuts the recording medium against the pair of transport rollers that are stopped, and the amount of abutment is when the back surface is fed when the front surface is fed. It is characterized by less.

  According to a sixth aspect of the present application, the skew feeding correcting means abuts the recording medium against a conveying roller rotating in a direction opposite to the paper feeding roller when feeding the front surface, and stops when feeding the rear surface. The recording medium is abutted against the conveying roller.

  According to a seventh aspect of the present application, the skew feeding correction means reversely rotates the conveying roller pair at a portion where the leading end portion of the recording medium slightly exceeds the conveying roller pair during the front side feeding, and forwardly rotates again. The means for improving the skew of the recording medium is characterized in that the recording medium is abutted against the pair of transport rollers that are stopped when the back surface is fed.

  According to an eighth aspect of the present application, the skew feeding correction means reversely rotates the conveying roller pair at a portion where the leading end portion of the recording medium slightly exceeds the conveying roller pair during normal surface feeding, and forwardly rotates again. The means for improving the skew of the recording medium is characterized in that the recording medium is abutted against a pair of conveying rollers that are reversed during the reverse side feeding.

  According to a ninth aspect of the present application, the skew feeding correcting means reverses the conveying roller pair at a portion where the leading end portion of the recording medium slightly exceeds the conveying roller pair, and rotates the conveying roller pair in the normal direction again, so This is a means for improving the line, and is characterized in that the reverse sheet feeding amount is smaller when feeding the back surface than when feeding the front surface.

  The skew correction means at the time of double-sided recording is set so that the pressure contact force becomes smaller when feeding the back surface than when feeding the front surface. This makes it difficult to transfer ink stains in the reversing mechanism to the recording medium, so that double-sided recording can be performed satisfactorily.

  According to the present invention, when double-sided recording is performed, the occurrence of ink stains can be suppressed and the time required for printing can be shortened.

  Hereinafter, although an embodiment of the present invention is described in detail based on a drawing, the present invention is not limited at all by this.

  FIG. 1 is a schematic configuration diagram showing an example of an image recording apparatus applicable to the present invention, and a double-sided recording mechanism (double-sided printing function) for enabling recording on both sides of a recording medium by inverting the recording medium. It has. In FIG. 1, 1 is a paper feed tray (paper feed unit), 2 is a recording unit (recording unit), 3 is a paper discharge tray (paper discharge unit), 4 is a reversing mechanism, 5 is a switching unit, 6 is a platen, 7 Is a transport path, 8 is a transport roller, 9 is a paper feed roller, and 10 is a reverse roller. A recording medium is stacked on the paper feed tray 1 and is fed one by one using a paper feed roller 9. An image is formed (recorded) by the recording unit 2 on the fed recording medium, and in the case of single-sided recording, the image is discharged as it is to the paper discharge tray 3.

  When performing double-sided recording, the recording medium is reversed after the front-side recording is completed. At that time, if it is necessary to dry the recording medium, it waits on the platen 6 before feeding to the reversing mechanism 4.

  When the recording medium is dried for the waiting time, the reversing operation is started. The switching unit 5 is rotated clockwise to switch the conveyance path 7 and fed to the reversing mechanism 4. In the reversing mechanism 4, the recording medium fed by using the reversing roller 10 is fed again to the recording unit 2, performs recording on the back side, and is discharged to the paper discharge tray 3.

  FIG. 2 is a perspective view showing a peripheral configuration of the recording unit 2 in the image recording apparatus of FIG. The recording unit 11 having an ejection port array for ejecting ink is installed on the carriage 13. A recording medium made of plain paper or an OHP sheet is sandwiched by a paper discharge roller 17 via a conveyance roller (not shown), and is sent in the direction of the arrow as the conveyance motor (not shown) is driven. A carriage 13 is guided and supported by a guide shaft 12 and an encoder (not shown). The carriage 13 is reciprocated along the guide shaft 12 by the driving of the carriage motor 15 via the driving belt 14. That is, the carriage reciprocates in the Y direction in FIG.

  A heating element (electric / thermal energy converter) that generates thermal energy for ink ejection in the interior (liquid path) of the ink ejection section of the ink jet recording head (details will be described later with reference to FIGS. 3 and 4) in the recording section 11. Is provided. According to the reading timing of an encoder (not shown), an image can be formed by driving the heat generating element based on a recording signal and causing ink droplets to fly and adhere to the recording medium.

  A recovery unit having a cap portion 16 is disposed at a home position (HP) outside the recording area. When recording is not performed, the carriage 13 is moved to the home position (HP) and the ink discharge port forming surface of the ink jet recording head is sealed by the cap unit 16 to fix the ink due to evaporation of the ink solvent, dust, paper dust, etc. Prevents clogging due to foreign matter adhesion.

  Further, the capping function of the cap unit 16 allows the ink to be supplied to the cap unit 16 away from the ink ejection port in order to eliminate ejection failure and clogging due to ink thickening and sticking of the ink ejection port with low recording frequency. A suction operation mode for recovering the ink discharge port that caused the discharge failure by using a pump (not shown) as a place for executing the preliminary discharge mode for discharging the ink, or operating a pump (not shown) to suck ink from the ink discharge port It is used as a place to execute. In addition, by disposing a blade adjacent to the cap portion 16, it is possible to clean the ink discharge port forming surface of the ink jet recording head.

  FIG. 3 is a schematic perspective view of the ink discharge port array of the ink discharge portion of the ink jet recording head 21 as viewed from the recording medium side, and FIG. 4 is a partial perspective view schematically showing the internal structure of the ink discharge portion. . This ink discharge portion has an ink discharge port surface 22 having a plurality of ink discharge ports 23, and generates energy necessary for discharging ink to a liquid path portion 31 communicating with the ink discharge ports 23. Discharge energy generating elements 32 are respectively disposed. An arrow Y in FIG. 3 indicates the scanning direction of the carriage 13. Reference numeral 33 in FIG. 4 denotes a sensor for detecting the print head temperature. In the present embodiment, the thermistors 33 are provided at both ends of the ejection port array. The temperature detection means is not particularly limited to this, and other sensors such as a diode sensor may be used, and the head temperature may be calculated from the duty of the printing dots.

  As shown in FIG. 4, in the present embodiment, a recording method for ejecting ink using thermal energy is used. However, the present embodiment is not limited to this recording method, and for example, an on-demand type In this case, a pressure control method in which ink droplets are ejected from an orifice (ejection port) by mechanical oscillation of a piezoelectric vibration element, and in the case of a continuous type, a charge control type, a divergence control type, or the like can be applied.

  Next, the configuration of the control system in the image recording apparatus shown in FIG. 1 will be described. FIG. 5 is a block diagram showing the configuration of the control system. The CPU 130, ROM 131, RAM 132, print head movement drive unit 133, print medium transport drive unit 134, print head print drive unit 135, data receiving unit 136, standby time timer unit 137, and interface unit 138 are connected via the data bus 141. Has been. The CPU 130 controls the entire recording device 144 based on a program built in the ROM 131. The recording information transmitted from the host computer 140 via the printer driver 139 is received by the data receiving unit 136 on the printer side. The data receiving unit 136 exchanges data according to the state of the printer, and the received data is stored in the RAM 132. In accordance with a recording command from the host computer 140, the CPU 130 controls the recording head movement driving unit 133, the recording medium transport driving unit 134, and the recording head recording driving unit 135, respectively.

  Further, FIG. 5 will be described in detail. The CPU 130 reads programs and various data from the ROM 131, the RAM 132, and the like, performs necessary calculations and determinations, outputs various control signals according to the control program, and controls the drive of the entire apparatus. The ROM 131 is a program memory, and stores various programs and various data for the CPU 130 to operate. A RAM 132 is a buffer memory, and includes a working area in which the CPU 130 temporarily stores data being processed and calculation results, a text area in which various data are stored, and the like. A standby time timer unit 137 is connected to the CPU 130 via a data bus 141 for measuring time based on an instruction signal from the CPU 130 and outputting time information.

  The CPU 130 is electrically connected to the host computer 140 via the interface unit 138, and controls a recording operation based on image data (recording data) from the host computer 140 stored in the ROM 131 or the RAM 132. Here, the host computer 140 is provided with a printer driver 139 for receiving recording information created or edited on the computer and passing it to the recording apparatus 144 side via the interface unit 138. Here, the printer driver 139 can set and select various information related to recording by the recording device 144, and these settings and selected information are also passed to the recording device 144 side. Yes.

  Examples of various information relating to recording include setting of the type of a recording medium such as a sheet to be recorded, selection of a single-sided recording mode or a double-sided recording mode, and the like. The CPU 130 controls the recording head movement driving unit 133 and the recording medium transport driving unit 134, and also records the recording unit 2 (recording head 21) via the recording head recording driving unit 135 based on the recording information stored in the RAM 132. To control. An operation panel for setting recording information such as a recording mode and a sheet sensor for detecting the leading edge and the trailing edge of the recording sheet are connected to the CPU via a data bus.

  The RAM 132 as the buffer memory stores print data for one scan or a plurality of scans. This line buffer is a buffer for storing information on which position in the recording area is to be recorded by the orifice of the recording head in one main scanning of the recording head. 6 and 7 show an example of how recording data is stored in a buffer provided in the RAM 132. FIG.

  The configuration of the buffer is M columns necessary for expressing the maximum recording width of the recording sheet usable by the recording apparatus 144 with a predetermined dot pitch, and is a row corresponding to the number of orifices of the recording head. Then, when the recording data sent from the host computer and developed is recorded on the front side of the recording sheet, as shown in FIG. 6, it is stored from the dot (black dot) information in the first row and first row of the buffer. Then, when recording on the back side, as shown in FIG. 7, the information is stored from the dot (dots filled in black) information in the H-th row and M-th column of the buffer. Here, when storing the recording data on the back side, the storing order is the same as that on the front side shown in FIG. 6, and the image data passed from the printer driver 139 shown in FIG. 5 to the recording device 144 side. The order of (recording data) may be reversed. Note that the dots shown in FIG. 6 schematically represent the dots developed and recorded on the recording sheet, and one dot is not necessarily handled as one recording data.

  Next, the double-sided recording mode of the ink jet recording apparatus of this example will be described based on the control system configured as described above. Here, the recording data stored in the line buffer (RAM 132) for recording in the recording apparatus is passed through the interface unit 138 after the printer driver 139 performs predetermined processing for double-sided recording. .

  FIG. 8 is a flowchart showing the flow of the recording operation in the duplex recording mode. In step S1, first, a recording start command is received from the host computer 140. Next, in step S 2, image data is received from the printer driver 139 of the host computer 140. Next, in step S3, based on the received image data, the time from the end of recording on the front surface (first recording surface) of the recording medium until the start of recording on the back surface (second recording surface) is started. Calculate and set (determine) the length (standby time).

  The waiting time here is for suppressing the undulation of the recording medium caused by the surface recording. If the recording medium is reversed without securing this time, there is a possibility that head rubbing will occur during jamming or backside recording. Therefore, when a large amount of ink is applied, a standby time is set, but this time is significantly shorter than the time for the ink applied to the surface to be completely fixed.

  Next, in step S4, the surface of the recording medium is recorded. The skew correction means at the time of feeding may be corrected while receiving a large pressing force as in the case of single-sided recording. This is because the recording medium loaded on the paper feed tray 1 is the one before ink application, and ink stains are not transferred to the paper feed roller 10 even when pressed with a strong force. The recording medium fed in this way is fed to the platen 6 for recording, and the recording on the surface is completed.

  Next, in step S5, the time set in step S3 is set in the timer. Next, in step S6, after the set time has elapsed, the recording medium is kept waiting for a certain time so that the back surface recording is started, and then the conveyance of the recording medium is resumed.

  At that time, the reversing roller 10 is rotated forward with the conveying roller pair 8 reversed. When the leading edge of the recording medium enters the conveying roller pair 8 in this state, the skew of the recording medium is corrected. However, since a part of the recording medium is passing through the reversing mechanism 4, the dirt adhering to the reversing roller 10 is transferred by the reaction force generated when the skew correction is performed. In particular, the stain on the reverse roller 10 closest to the conveying roller pair 8 is most easily transferred because the reaction force is large.

  Therefore, in order to prevent the transfer contamination due to the above, the amount of the recording medium abutted with the conveying roller pair 8 reversed is shortened. In the case of recording on the back side, since the correction is performed at the same time when feeding the front side, it is not necessary to make a large correction again. Therefore, there is no problem even if the abutting amount is shorter than the surface.

  By shortening the abutting amount, the pressure contact force generated on the reversing roller 10 is reduced, and it is possible to prevent ink stains adhering to the reversing roller 10 from being transferred to the recording medium.

  In step S7, recording is performed on the back surface of the recording medium. When the recording on the back surface is completed, the recording medium is discharged to a paper discharge tray (paper discharge unit) 3. This completes the double-sided recording (step S8).

  As described above, in the present embodiment, since the skew correction on the back surface of the recording medium is performed shorter than the front surface, ink stains in the transport path are difficult to transfer. As a result, ink stains on the recording medium can be sufficiently suppressed, and the total recording time in double-sided printing can be shortened.

  In the above-described embodiment, as a method for preventing ink stains in the conveyance path from being transferred, a method for shortening the amount of the recording medium that enters the recording medium while the conveyance roller pair 8 is reversed has been described. However, the recording medium receives during skew correction. If the pressure contact force becomes small, another skew correction method may be performed. For example, the recording medium may be rushed with the conveying roller pair 8 reversed when feeding the front surface, and the recording medium may be rushed with the conveying roller pair 8 stopped when feeding the back surface. Further, a method in which skew correction is not performed at the time of back surface conveyance may be used.

  In addition, although the example which used the inkjet recording system as a recording system was demonstrated above, the recording system of this invention does not need to be limited to an inkjet recording system, and also a thermal transfer recording system, a thermal recording system, and also wire dot recording The present invention can be applied to a recording method such as a method, or any other recording method. Further, it is not necessary to limit to the serial recording method, and a so-called line recording method may be used.

  The present invention provides an excellent effect particularly in a recording apparatus using an ink jet recording head that performs recording by forming flying droplets using thermal energy among ink jet recording methods.

  As its typical configuration and principle, for example, those performed using the basic principle disclosed in US Pat. Nos. 4,723,129 and 4,740,796 are preferable. This method can be applied to both 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). By applying at least one drive signal corresponding to the recording information and applying a rapid temperature rise exceeding the nucleate boiling to the electrothermal transducer, the thermal energy is generated in the electrothermal transducer, and the recording head This is effective because film boiling occurs on the heat acting surface, and as a result, bubbles in the liquid (ink) corresponding to the drive signal on a one-to-one basis can be formed. By the growth and contraction of the bubbles, liquid (ink) is ejected through the ejection opening to form at least one droplet. It is more preferable that the drive signal has a pulse shape, since the bubble growth and contraction is performed immediately and appropriately, and thus it is possible to achieve discharge of a liquid (ink) having particularly excellent responsiveness. As this pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. Further excellent recording can be performed by employing the conditions described in US Pat. No. 4,313,124 of the invention relating to the temperature rise rate of the heat acting surface.

  As the configuration of the recording head, in addition to the combination configuration (linear liquid channel or right-angle liquid channel) of the discharge port, the liquid channel, and the electrothermal transducer as disclosed in each of the above-mentioned specifications, the heat acting part The configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose the configuration in which the lens is disposed in the bending region, are also included in the present invention.

  In addition, for a plurality of electrothermal transducers, Japanese Laid-Open Patent Publication No. 59-123670 which discloses a configuration in which a common slit is used as the discharge portion of the electrothermal transducer, and an opening for absorbing pressure waves of thermal energy are disclosed. The effect of the present invention is also effective as a configuration based on Japanese Laid-Open Patent Publication No. 59-138461 which discloses a configuration corresponding to the discharge unit. That is, regardless of the form of the recording head, according to the present invention, recording can be performed reliably and efficiently.

  Furthermore, 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 that can be recorded by the recording apparatus. As such a recording head, either a configuration satisfying the length by a combination of a plurality of recording heads or a configuration as a single recording head formed integrally may be used.

  In addition, even the serial type as shown in the above example can be connected to the main body of the recording head or attached to the main body of the device so that electrical connection with the main body of the device and ink supply from the main body are possible. The present invention is also effective when a replaceable chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself is used.

  In addition, it is preferable to add a recording head ejection recovery means, a preliminary auxiliary means, and the like as the configuration of the recording apparatus of the present invention, since the effects of the present invention can be further stabilized. Specifically, capping means for the recording head, cleaning means, pressure or suction means, preheating means for heating using an electrothermal transducer or a combination thereof, ejection different from recording Preliminary discharge means for performing the above can be mentioned.

  Also, regarding the type or number of mounted recording heads, two or more recording heads may be provided corresponding to a plurality of inks having different recording colors and densities. That is, for example, as a recording mode of the recording apparatus, not only a mainstream color recording mode such as black, but also a recording head may be configured integrally or by a combination of a plurality of colors, Alternatively, the present invention is extremely effective for an apparatus having at least one of full-color recording modes by color mixing.

  Further, in the embodiments of the present invention described above, the ink is described as a liquid. However, an ink that solidifies at room temperature or lower and that softens or liquefies at room temperature may be used, or an ink jet system. In general, the temperature of the ink itself is adjusted within a range of 30 ° C. or higher and 70 ° C. or lower to control the temperature of the ink so that the viscosity of the ink is within a stable discharge range. An eggplant may be used.

  In addition, in order to prevent the temperature rise due to thermal energy from being used as the energy for changing the state of the ink from the solid state to the liquid state, or to prevent the ink from evaporating, it is solidified in the state of standing and liquefied by heating. Ink may be used. In any case, by applying thermal energy according to the application of thermal energy according to the recording signal, the ink is liquefied and liquid ink is ejected, or when it reaches the recording medium, it already starts to solidify. The present invention can also be applied to the case where ink having a property of being liquefied for the first time is used. The ink in such a case is in a state of being held as a liquid or a solid in a porous sheet recess or through-hole as described in JP-A-54-56847 or JP-A-60-71260. Alternatively, the electrothermal converter may be opposed to the electrothermal converter. In the present invention, the most effective one for each of the above-described inks is to execute the above-described film boiling method.

1 is a schematic configuration diagram illustrating an example of a recording apparatus applicable to the present invention. FIG. 2 is a perspective view illustrating a peripheral configuration of a recording unit 2 in the image recording apparatus of FIG. 1. 3 is a schematic perspective view of an ink discharge port array of an ink discharge portion of the inkjet recording head 21 as viewed from the recording medium side. FIG. It is a fragmentary perspective view which shows typically the internal structure of an ink discharge part. 1 is a block diagram showing a control system of an image recording apparatus according to an embodiment of the present invention. It is explanatory drawing explaining the buffer memory of the recording device. It is another explanatory drawing explaining the buffer memory of the recording device. It is a flowchart which shows the flow of the recording operation at the time of double-sided recording mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feed tray 2 Recording part 3 Paper discharge tray 4 Reversing mechanism 5 Switching part 6 Platen 7 Carriage path 8 Carrying roller 9 Paper feed roller 10 Reverse roller 130 CPU
131 ROM
132 RAM
133 Recording Head Movement Driving Unit 134 Recording Head Medium Conveying Unit 135 Recording Head Recording Driving Unit 136 Data Receiving Unit 137 Standby Time Timer Unit 138 Interface Unit 139 Printer Driver 140 Host Computer 144 Recording Device

Claims (9)

A recording apparatus capable of recording on a recording medium by either single-sided recording or double-sided recording,
Recording means for recording in response to a signal;
Conveying means for conveying a recording medium during single-sided and double-sided recording;
In the duplex recording, the skew feeding correction means at the time of front side feeding and back side feeding are different, and
A recording apparatus comprising:   The recording apparatus according to claim 1, wherein the skew correction unit is configured such that a pressure that the recording medium receives from the conveying unit during back surface skew correction is smaller than a pressure that is received during front surface skew correction.   3. The skew feeding correction means according to claim 1, wherein the skew feeding correction means performs one or more types of skew feeding correction means when feeding the front side, and does not perform the skew feeding correction means when feeding the back side. Recording device.   The skew feeding correcting means is a means for abutting the recording medium against a pair of conveying rollers rotating in a direction opposite to the paper feeding roller and the recording medium reversing roller, and the amount of the abutting is when the back surface is fed. The recording apparatus according to claim 1, wherein the recording apparatus is less than that during feeding.   The skew feeding correcting means is means for abutting a recording medium against a pair of transport rollers that are stopped, and the amount of abutment is smaller when feeding the back surface than when feeding the front surface. Or the recording apparatus of 2.   The skew feeding correction unit abuts the recording medium against the conveyance roller rotating in the direction opposite to the paper feed roller when the front side is fed, and abuts the recording medium against the conveyance roller that is stopped during the back side feeding. The recording apparatus according to claim 1, wherein the recording apparatus is a recording apparatus.   The skew feeding correcting means improves the skew feeding of the recording medium by reversely rotating the conveying roller pair at a portion where the leading end portion of the recording medium slightly exceeds the conveying roller pair and performing normal rotation again at the time of surface feeding. The recording apparatus according to claim 1, wherein the recording medium is abutted against a pair of conveying rollers that are stopped when the back surface is fed.   The skew feeding correcting means improves the skew feeding of the recording medium by reversely rotating the conveying roller pair at a portion where the leading end portion of the recording medium slightly exceeds the conveying roller pair and performing normal rotation again at the time of surface feeding. The recording apparatus according to claim 1, wherein the recording medium is abutted against a pair of conveying rollers that are reversed during back-side feeding.   The skew feeding correcting means is a means for improving the skew feeding of the recording medium by reversing the conveying roller pair at a portion where the leading end portion of the recording medium slightly exceeds the conveying roller pair and rotating it again forward. The recording apparatus according to claim 1 or 2, wherein the amount of reversal paper feed is less when feeding than when feeding front.

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