JPH01249457A - Liquid jet recorder - Google Patents

Abstract

PURPOSE:To always prevent a levitation of recording sheet, by providing a means attracting a medium to be recorded toward a feed means, a leading end pressing means bringing the end of the medium to be recorded into pressure contact toward the feed means, and a movable pressing means bringing the medium to be recorded into pressure contact toward the feed means in conjunction with a recording head. CONSTITUTION:A recording sheet 2 is electrically charged by a charger 12 having an upper side held positive and a lower side held negative and further brought into pressure contact with a belt 7 by pinch rollers 13A and 13B, thus being fed in a direction of X1 in the state of being securely electrostatically attracted by the belt 7. The title device is equipped with a cleaning unit 14 removing dust from the surface of the belt 7 and a recording sheet presser 15 rotatable about a rotating shaft 15A to hold the leading end of the sheet by the recording sheet presser 15 during recording. A sheet presser roller 23 acts to press down the recording sheet 2 against the endless belt 7 while moving with a recording head unit 27, thus ensuring the prevention of the recording sheet 2 from levitating just before a recording position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid jet recording device, and more particularly to a liquid jet recording device suitable as a line type capable of recording on cut paper.

(Prior Art) This type of liquid jet recording device that records information such as characters and images by ejecting recording liquid from a recording head has traditionally been known as a serial type recording device or a line type recording device. There are recording devices. Among these, the serial type has several sheet guides installed along the circumference of a platen that holds the recording material, and these guides prevent the sheet, which is the recording material, from lifting off the platen. The recording head mounted on the carriage performs recording while holding the carriage at the platen and moving the carriage along the platen.In addition, in this case, each time one line is recorded, the direction of movement of the carriage is changed. See (feed) in the right angle direction.

On the other hand, in the case of a line-type recording apparatus, a recording head is provided with ink ejection ports disposed over the entire recording width in the main scanning direction, and a continuous sheet such as a roll paper is generally used as the recording material. In such a case, recording is performed while feeding the above-mentioned continuous sheet in the sub-scanning direction, an outline of which is shown in FIG. Here, 101 is a recording head unit, and in this example, four color image recording heads are arranged. 102 is a roll-shaped continuous sheet;
103 is a tension roller that feeds the continuous sheet 102 while applying appropriate tension to it, and 104 is an air suction device that keeps the continuous sheet 2 suctioned onto the flat platen 105.

In such a line-type recording device, the continuous sheet 102 is pulled out with tension maintained in the direction of the arrow by the tension roller 103, but during this time, the continuous sheet 102 is sucked by the platen 105 by the air suction device 104 and kept in a flat state. The continuous sheet 102 is kept as it is because it sag.
The recording head unit 101 sequentially records data thereon.

However, in recent years, with the diversification of recording media formats,
A line-type recording apparatus capable of recording on cut sheets has become desired, and a system as shown in FIG. 5 has been proposed. Here, 106 is the cut sheet 107
Endless belt capable of electrostatic adsorption, 108 is cut sheet 1
This is a charger for charging 07 with static electricity.

Therefore, in a line type recording device configured in this way,
When the cut sheet 107 is sent out onto the endless belt 106 that has been neutralized, it is charged by the charger 108 and conveyed while being attracted to the belt 106. During this time, the recording head unit 101 performs recording. The finished sheets are discharged onto the discharge tray 109.

[Problems to be Solved by the Invention] However, in the conventional line-type liquid jet recording device as described above, the only restraining force that holds the sheet, which is the recording material, in the recording position is the adsorption force due to static electricity. If the recording sheet has any curls or creases, the leading edge of the recording sheet tends to lift off the conveyor belt, causing it to get caught in the recording head, damaging the recording sheet and making it impossible to record. There was a drawback.

An object of the present invention is to focus on the above-mentioned conventional problems, and to solve the problems, it is an object of the present invention to provide liquid jet recording that can constantly prevent the recording sheet from lifting up during transportation and recording, and guarantees reliable recording operation. The goal is to provide equipment.

[Means to solve the problem]

In order to achieve this object, the present invention performs recording by ejecting a recording liquid from a recording head that moves along the recording material onto the recording material guided to a predetermined recording position by a conveyance means. In a liquid jet recording apparatus, a means for suctioning a recording material toward a conveyance means, a tip pressure contact means for pressing an end of the recording material on the recording start side of the recording head toward the conveyance means, and a tip pressing means for pressing the end of the recording material on the recording start side toward the conveyance means; The apparatus is characterized in that it includes a moving pressing means that presses the recording material toward the conveying means while cooperating with the recording head.

[Effect]

According to the present invention, the tip of the recording material guided to the recording position is kept in a state where its tip, which tends to float, is held down by the tip pressure contact means. The movable pressure contact means that moves together with the head suppresses the lifting of the recording sheet in combination with electrostatic adsorption or air suction adsorption, so the recording sheet does not come into contact with the tip of the recording head, and the recording operation is prevented. Reliability can be increased.

(Example) Examples of the present invention will be described below in detail and specifically based on the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, the left side is the paper feeding system, the center is the recording sheet conveyance system and recording means, and the right side is the ejection system. Cassette, 2 is the recording sheet stored in cassette 1, 3
A feeding roller feeds out the recording sheets 2 one by one from the cassette 1, and 4 and 5 are conveyance rollers for feeding the recording sheets 2 to the conveyance system, and pinch rollers in contact therewith.

Also, 6 is the recording sheet 2 sent out from the cassette 1.
This is a chevron-shaped receiving guide that temporarily holds the leading end of the recording sheet 2 in a receiving loop shape in front of the conveyance system, and can perform a registration operation to align the leading end of the recording sheet 2 in line via the receiving guide 6. . 7 is an endless belt that conveys the recording sheet 2 that has been sent out; 8 is an idle roller for tensioning the endless belt 7; 9 is a tensicon roller; 10
1 is a belt drive roller that drives the endless belt 7, and 11 is its drive motor.

Furthermore, in this example, chargers 12 are provided above and below the entrance of the conveyance system, and on both sides of the belt of the charger 12, pinch rollers 13^ and 13B are provided which are in pressure contact with the idle roller 8 via the belt 7. Although the endless belt 7 has been neutralized, the recording sheet 2 is charged by a charger 12 that holds the upper side as positive and the lower side as negative.
A potential difference is created between the recording sheet 2 and the belt 7, and the above-mentioned pinch rollers 13A and 13
By being brought into pressure contact with the belt 7 by the belt B, the sheet is conveyed in the direction of X while being firmly electrostatically attracted to the belt 7. 14 is a cleaning unit that removes dust such as paper dust from the surface of the belt 7, and 15 is a recording sheet holder that is rotatable around a rotating shaft 15^, which will be explained in detail later. The leading edge of the sheet can be held by the sheet presser 15.

20 is a recording head; in this example, the recording head 20
are head bodies 20^, 20B that eject four colors of ink: yellow, cyan, magenta, and black, respectively.
Consisting of 20G, 200, each head is 16
It has 3456 ink ejection ports in the main scanning direction at intervals of dots/mts, and can perform printing with a line width of 216 mm.

21A to 210 are ink tanks that supply ink of colors corresponding to the individual heads 20^ to 200; 22^ to 22D;
are respective ink supply tubes, and here, the water head in the ink tanks 21A to 21D is the same as that of each head body 20A.
-200 is maintained at a predetermined height lower than the ink ejection surface, and ink is supplied to each individual head via a tube by capillary action.

Reference numeral 23 denotes a sheet presser roller arranged in parallel with each of the head bodies 20^ to 200, and the sheet presser roller 23 presses the recording sheet 2 while moving together with the recording head unit 27.
This sheet pressing roller 23 can prevent the recording sheet 2 from floating up at the position immediately before recording.

Reference numeral 26 denotes a holder that holds the recording head 20 integrally, and the recording head unit 27 integrally constituted by the holder 26 is moved by a moving means 28 (details omitted).
The recording head 20 is moved in the x2 direction from XI, and during this time ink is ejected from the recording head 20 to perform recording.

Next, the discharge system will be explained. 32 is a discharge tray. Further, 36 is a cap member for recovery operation and capping of the recording head 20, and an ink absorber such as a sponge is loaded inside the cap member 3B, although not shown.

37 is a motor driver for the drive motor 11; 38 is a head driver for selectively supplying a recording signal to the recording head 20; 39 is a charger driver; 40 is a motor driver for supplying a drive signal to the paper feed motor; 41 is a control circuit that has a CPII function and controls the entire recording apparatus.

Figures 2A to 2D show the states of the conveyance system, ejection system, and capping means at each stage during recording, ejection, recovery operation, and capping. 15, the leading edge of the recording sheet 2 on the belt 7 is pressed onto the stopper 42. Further, when ejecting the recording sheet after recording is completed, the sheet presser 15 is reversed around the rotating shaft 15A and connected to the ejection tray 32, as shown in FIG. 2B, and in this state, the recording sheet 2 is
is discharged from the bell door to the discharge tray 32 along the surface of the sheet presser 15.

Further, during the recovery operation, the ejection tray 32 moves from the state shown in FIG. 2B in the direction of arrow P, and then the cab member 36 rises from below, and the recording head 2 moves as shown in FIG. 2C.
It stops when a predetermined distance from 0 is maintained. Further, the recording sheet presser 15 comes off from the discharge tray 32 and is stopped by the stopper 43 to stop its rotation. In this way, dry ejection is performed in response to a predetermined number of dry ejection signals supplied to the recording head 20, but in this example, such dry ejection is performed when the power is turned on and after approximately 100 continuous sheets of printing have been performed. be done.

Furthermore, at the stage when printing is completed, the cap member 36 further rises from the position shown in FIG. 2C as shown in FIG. Prevents it from becoming viscous.

Therefore, a series of operations performed via the control circuit 41 in the liquid jet recording apparatus configured as described above will be explained with reference to FIG. A certain recording head 20 is capped with a cap member 36, and when the power is turned on in step S1, the cap member 36 is retreated to the recovery position shown in FIG. 2C in step S2.

Next, in step S3, it is determined whether or not there is a dry ejection signal, and if it is determined that there is a dry ejection signal, the process proceeds to step S5 after performing a dry ejection signal in step S4, but if it is "absent", the Proceeding to step S5, the motor driver 40 drives the feeding system motor to cause the feeding roller 3 to feed one sheet 2 in the cassette 1. And step S6
After waiting for the registration to be completed for a predetermined period of time, the feeding system motor is stopped in step S7. Furthermore, during this time,
The recording sheet 2 forms a loop in the space within the receiving guide 6, and its leading edge follows the registration portion to ensure perpendicularity to the transport direction. Next, in step S8, the motor 11 is driven by the motor driver 37 to enable the endless belt 7 to transport the recording sheet 2, and the charger 12 is turned on to place the recording sheet 2 being fed just before the pinch roller 13B. to charge the battery.

As a result, the recording sheet 2 charged and attracted to the belt 7 is further kept pressed against the belt 7 by the pinch roller 13B. Next, proceed to step S9,
In this state, a sensor (not shown) determines whether or not the recording sheet 2 has been conveyed to the recording position PR as shown in FIG. Then, in step Sll, the recording sheet presser 15 is driven by an actuator (not shown), such as a solenoid actuator, to press the leading edge of the recording sheet 2 as shown in FIG. 2A, and in step 512, the cap member 36 is further moved from the recovery position. In step S13, the discharge tray 32 is driven rightward from the state shown in FIG. 2C to the state shown in FIG. 2A.

Now you can record, so step 51
4, the recording head 20 is driven rightward from the home position. At this time, the recording sheet 2 is at the recording position P.
The leading edge of the sheet is kept pressed by the recording sheet presser 15 at R, and the entire sheet is electrostatically attracted to the belt 7, and is further pressed together with the recording head 20 by the preceding sheet presser roller 23. Therefore, the sheet never floats up from above the belt 7. When recording is completed in this way, the recording sheet presser foot 15 is rotated in the next step S15 to release the presser foot and maintain the discharge state shown in FIG. 2B. In step 516, the motor 11 is driven again to eject the recording sheet 2 onto the ejection tray 32 by the belt 7.

Thus, in step 517, it is determined whether or not the ejection is completed, and after waiting for the completion, the process proceeds to step 518, where:
Motor 11. Both chargers 12 are turned off, and
The discharge tray 32 is moved back from the position shown in FIG. 2B to the position shown in FIG. 2C, and in the next step 519, the recording head 20 is moved back to the home position.

Then, in step Sho, it is determined whether or not recording has been completed, and if it is determined that recording has not been completed, the process returns to step S2 and the following steps are repeated. Further, if it is determined in step S20 that recording has ended, the process proceeds to step 521, where the cab member 36
is pulled up and attached to the recording head 20 as shown in FIG. 2D, and the power is turned off in step S22.

Now, in the embodiments described above, an electrostatic adsorption belt was used to restrain the recording sheet in a direction perpendicular to the sheet surface, but such means are not limited to the electrostatic adsorption belt. It may also be adsorbed to a flat platen or a conveyor belt using air.

(Effects of the Invention) As described above, according to the present invention, there is provided a means for suctioning a recording material toward a conveying means, and a means for sucking a recording material toward a conveying means, and a means for sucking a recorded material toward a conveying means, and a means for sucking a recorded material toward a conveying means, and a means for sucking a recorded material toward a conveying means, and a means for sucking a recorded material toward a conveying means. Since the movable pressing means presses the recording material and the tip holding means presses the recording start side end of the recording material, even if the recording material has creases or other irregularities, the recording material can be easily fixed. It is difficult to hold the recording material in a flat state on the conveyance means, and in particular, because the end on the recording start side is pressed flat, the leading edge of the recording material may get caught by the moving recording head and become damaged. Damage to the recording material and occurrence of jams are prevented, and even if there is an unevenness that remains in the middle of the recording material, the movable pressure contact means presses the position immediately before recording. Accurate recording can be performed by maintaining a sufficient distance between the recording head and the recording material without the recording head getting caught on the way, and reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the configuration of the liquid jet recording apparatus of the present invention, and FIGS. 2A, 2B, 2C, and 2D are the conveyance system, discharge system, and cap of the recording apparatus shown in FIG. 1. FIG. 3 is a flowchart showing the procedure of a series of control operations during recording according to the present invention; FIG. 4 and FIG. FIG. 2 is a side view schematically showing two examples of the configuration of a conventional line-type liquid jet recording device. 2... Recording sheet, 3... Feeding roller, 5... Pinch roller, 6... Receiving guide, 7... Endless belt, lO... Belt drive roller, 11... Drive Motor, 12... Charger, 15... Recording sheet presser, 15A... Rotating shaft, 20... Recording head, 23... Sheet presser roller, 27... Recording head unit, 28...・
Head moving means, 32... Ejection tray, 36... Cap member, 37... Motor driver, 38... Head driver, 39... Charger driver, 40 -... Motor driver, 41... - Control circuit, 42, 43... Stopper. 15 Written Credibility Sheet NIi Figure 2A Pg== Figure 28

Claims (1)

[Scope of Claims] A liquid jet recording device in which recording is performed by ejecting recording liquid from a recording head that moves along a recording material guided to a predetermined recording position by a conveyance means. , a means for suctioning the recording material toward the conveyance means; a tip pressure contact means for pressing an end of the recording material on a recording start side by the recording head toward the conveyance means; 1. A liquid jet recording apparatus, characterized in that the liquid jet recording apparatus further comprises: a moving pressure contact means that presses the recording material toward the conveyance means while cooperating with the recording head.