KR19990038218A - Carriage position and paper sensing device and control method of inkjet printer - Google Patents

Abstract

The present invention reduces the cost of the product by mounting a reflective sensor on the carriage and controlling the position of the carriage and detecting the paper, and by positioning the sensor near the ink head, in particular, the position of the paper during feeding. Of the carriage position of the inkjet printer and the detection device and control method of the inkjet printer to maintain the accuracy of the top margin of the paper, and to detect the paper and the carriage by installing a reflective sensor on the inkhead of the inkjet printer. Cost savings can be achieved by sharing the initial motion sensor, and by installing the paper sensor near the ink head, it is possible to precisely control the position of the paper during the feeding operation. It can be effective.

Description

Carriage position and paper sensing device and control method of inkjet printer

The present invention relates to a carriage position and paper sensing device and control method of the inkjet printer, and more particularly to a carriage position and paper sensing device and control method of the inkjet printer for sensing the position of the carriage and the paper.

In general, an inkjet printer is an apparatus that prints the content (material) on a computer monitor by receiving an electric signal from a computer and prints it, and is equipped with one or two ink heads.

The ink head is mounted on the carriage which is the printing device portion of the inkjet printer, and there are two types of mono and color.

Such an inkjet printer includes a paper feeder unit 20 for supplying paper, a feeder unit 30 for feeding paper from the paper feeder unit 20 and transporting the paper, as shown in FIG. It consists of a printing device unit 40 for printing on the paper conveyed by the feeder unit 30, and a paper discharge device unit 50 for discharging the paper printed by the printing device unit 40 to the outside, the case It is attached to the mounting frame 11 provided in the inside.

The printing device unit 40 has an ink head 42 having a nozzle (not shown) for ejecting ink, installed in the carriage 41, and is conveyed through the nozzle according to the left and right movement of the carriage 41. Printing is carried out on the paper conveyed by the unit 30.

And the carriage 41 is supported and mounted to the separation prevention portion 13 and the guide rod 14 mounted on the upper and lower sides of the mounting frame 11 side, respectively, the drive timing pulley ( Not shown) and the driven timing pulley 45 is installed, the timing belt 43 is wound around the outer peripheral surface of the drive timing pulley and the driven timing pulley 45, the drive timing pulley is connected to the motor 46.

That is, when the motor 46 is driven, the timing belt 43 connected thereto is rotated while the driving timing pulley is rotated, so that the carriage 41 reciprocates left and right along the departure preventing part 13 and the guide rod 14. It is moved.

The paper feeder unit 20 includes an automatic paper feeder 21 for storing paper, and a pickup roller for transferring the paper stored in the automatic paper feeder 21 to the transfer device 30. The automatic paper feeder 21 The guide groove is formed at one side of the upper end thereof, and the paper adjusting mechanism 28 is installed here so that the paper stored in the automatic sheet feeding unit 21 can be neatly aligned and adhered to one side.

2 illustrates a printing process by an inkjet printer, wherein the sheet 26 stored and stored in the automatic sheet feeding unit 21 is cut into the friction roller 32 of the conveying unit 30 through a pickup roller 27. ) Is fed between the feed roller 31 and the feed roller for printing.

The paper conveyed in this way is configured to be discharged to the outside of the inkjet printer while being transferred between the discharge roller 51 and the document contact wheel 52 when passing through the guide frame 53 to reach the paper discharge device unit 50.

Meanwhile, when the feed roller 31 is rotated in a state in which the driving roller 33 is engaged between the discharge roller 51 and the feed roller 31, the driving roller 33 receives this power and transmits the power to the discharge roller 51. By doing so, the discharge roller 51 is rotated.

The paper feeder unit 20 picks up the automatic feeder 21 for accommodating the paper 26 and the pick-up roller for removing the sheet 26 stored in the automatic feeder 21 one by one and feeding the sheet 26 to the feeder unit 30. It is composed of 27, the automatic sheet feeder 21 is composed of a knock-up plate 23 for storing the main frame 22 and the paper 26 in one place, and arranged neatly, the upper end of the main frame 22 Between the lower end of the knock-up plate 23 and the knock-up spring 24 is mounted.

On the other hand, the belt hanger 44 is formed on the rear side of the carriage 41, and one side of the timing belt 43 is fastened to the belt hanger 44 so that the carriage 41 moves when the timing belt 43 moves. Therefore, the nozzle part 47 which moves, and injects ink to a paper is formed in the lower end of the ink cartridge 42 attached to the carriage 41. FIG.

The mounting frame 11 is provided inside the case 10, and a lid 12 is mounted in front of the inkjet printer to contact the case 10.

On the other hand, the paper accommodated in the paper feeder unit 20 is packed with dozens of paper when manufactured by the paper company, before the paper is stored because the paper is rubbed with each other and the paper is not easily separated one by one The user blows the paper in advance or turns the sheets by hand to separate them.

And to separate the sheet by sheet to prevent the multiple sheets of paper from being fed at once the finger 25 is installed at the bottom of the knock-up plate 23 to hold the paper.

However, the use of the carriage position and paper detection sensor separately may cause cost increase, especially when paper feed is detected at the previous position of the drive roller during feeding operation, and the top margin may be caused by the mechanical tolerance of the inkjet printer and the operation error of the drive roller. There was a problem that a position error on the paper with respect to.

Therefore, the present invention is to solve the above-described problem, by mounting a reflective sensor on the carriage, and use this for carriage position control and paper detection, reducing the product cost, the position of the sensor near the ink head It is an object of the present invention to provide a carriage position of the inkjet printer and a sensing device and a control method of the ink jet printer, in which the position of the paper is precisely controlled at the time of feeding, and the accuracy of the top margin of the paper is maintained.

The present invention for achieving this object is characterized in that the reflective sensor installed on the ink head of the inkjet printer to share the paper detection and the carriage initial operation sensor.

1 is a perspective view showing the inside of a conventional inkjet printer,

2 is a right side view of the inkjet printer showing a printing process according to FIG. 1;

3 is a side schematic view of an inkjet printer according to the present invention;

4 is a plan view schematically illustrating the inkjet printer according to the present invention;

5 is a flowchart showing a paper feeding operation according to the present invention;

6 is a flowchart illustrating a carriage initial operation according to the present invention.

* Explanation of symbols on main parts of the drawings

26; Paper 27; Pick up roller

41; Carriage 42; Inkhead

450; Reflective sensor 451; Carriage indicator

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

The inkjet printer applied to the present invention is a serial printer, and the printing operation is performed by ejecting ink from the ink head at a predetermined printing position while the carriage equipped with the ink head moves from side to side, and the carriage is located at the printing position on the frame of the inkjet printer. In order to have the location information, the initial position of the carriage should be determined by using a sensor at the moment of supplying power to the inkjet printer.

A series of operations for identifying the initial position of the carriage is called carriage initial operation.

In addition, in order to print on the paper, the paper must be separated from the automatic paper feeder that holds a plurality of sheets one by one and fed to the transfer unit. When the printing operation for one line is completed, the paper must be transferred to the next line. Once the sheet has been printed, the paper must be transported and discharged out of the inkjet printer.

3 and 4 are side and plan views, respectively, according to the present invention.

First, in the paper feeding operation, the paper 26 in the knock-up plate 23 is conveyed in the direction of the ink head 42 past the feed roller 31 as the pickup roller 27 rotates one counterclockwise.

At this time, the reflective sensor 450 on the same carriage 41 as the ink head 42 detects the leading edge of the paper being conveyed, and when the leading edge of the paper is detected, the paper is further transported as necessary for the upper margin. And the paper feeding operation ends.

The top margin is the space of the product, which varies from manufacturer to manufacturer, and in order to ensure a sufficient reduction distance of the motor, the position of the reflective sensor 450 in the paper length direction should be installed before the first nozzle position (a). good.

In this way, the top edge of the paper can be exactly matched to the ink head 42 during the feeding operation, thereby ensuring the quality of the top margin.

The same sensor is also used in the initial operation of the carriage 41.

The carriage indicator 451 is for initial operation of the carriage 41 and is marked in white to distinguish it from the black inkjet printer of the reflective sensor 450. When the power is supplied, the carriage 41 is used as a carriage indicator. The initial position of the carriage 41 is determined by moving toward 451.

5 is a flowchart for a paper feeding operation, first driving the carriage 41 to move the reflective sensor 450 to a position near the center of the paper during the paper feeding operation (S1).

Next, while rotating the pickup roller 27 in the counterclockwise direction (S2) by checking the state change of the reflective sensor to detect whether the paper is coming in (S3).

At this time, if the paper is not detected even if the pickup roller 27 is rotated by a certain amount or more, since the paper is not stored on the main frame 23, an error processing for the non-paper storage is performed (S4). Is moved by a distance necessary to fit the upper margin (S5), the paper feed operation is terminated, and the carriage 41 is returned to the position before the operation (S6), thereby terminating the paper feeding operation.

6 is a flowchart of an initial operation of the carriage.

Here, the detection sensor state is on when the paper or the carriage indicator detects the white, and off means that the other detection sensor detects the black portion of the device.

When power is supplied to the inkjet printer, a discharge operation may be performed to discharge paper that may be stored in the paper feeder (S1), and the current detection sensor state is checked (S2).

In order to determine whether the carriage 41 is on the carriage display unit 451, the process proceeds to S5. It stops (S3).

If the sensor 450 is not detected as a state change, the carriage outage is generated. Therefore, an error processing for the carriage outage is performed (S4).

If the state change is detected as ON, the condition is the same as the state in S2. Therefore, the sensor detects the state change of the sensor while moving to the maximum frame inner distance to the right (S5). Error handling for paper jams (S6).

If the detection sensor is changed only from the on state to the off state to check whether the carriage is actually at the point A (Fig. 4) to the point B (Fig. 4) to the left to check the change in the detection sensor state (S7).

If the on state is detected at the point B, the normal state is moved, so that the carriage is moved to the point A to position the initial position (S8), and the initial operation is terminated.

If it is not detected from point B, check whether it was detected before point B, and if that is the case of paper detection, error handling for paper jam is performed (S6), otherwise the state is maintained even if the carriage movement is finished. If it is not detected because the carriage is out of the carriage during the carriage is carried out error processing for carriage outage (S4).

As described above, the present invention can reduce the cost by sharing the paper detection sensor and the sensor for the initial operation of the carriage, and the position of the paper during the paper feeding operation by installing the paper detection sensor near the ink head. It is possible to control precisely, so that there is an effect of accurately managing the error of the top margin.

Claims (3)

Carriage position and paper detection device of the inkjet printer, which has a reflective sensor installed in the ink head of the inkjet printer to share the paper detection and the carriage initial motion sensor. Driving the carriage first to move the reflective sensor to a position near the center of the sheet during the sheet feeding operation; Rotating the pickup roller in a counterclockwise direction; Checking whether a sheet enters by checking a state change of the reflective sensor; If the paper is not detected even if the pickup roller is rotated more than a predetermined amount, there is no paper on the main frame, so that an error processing for the non-paper storage is performed; If the paper is detected, moving the paper by the distance required to fit the top margin; Ending the paper conveyance operation and returning the carriage to the position before the operation, the control method of the carriage position and the paper detection of the inkjet printer. Performing a discharge operation to discharge paper which may be stored in the paper feeder when the inkjet printer is supplied with power; Checking the current sensor status and checking the sensor change state while moving to the right by the maximum frame inner distance to determine whether a paper jam has occurred or if the carriage is on the carriage indicator; Checking the state of the sensor and checking the change in the state of the sensor while stopping the maximum frame inner distance to the left when the state of the sensor is off; If it is detected that the state change is not detected when the detection sensor is turned on, an error processing for carriage outage occurs; Checking a detection sensor when a state change is detected as ON; Checking the state of the detection sensor while moving to the right by the maximum frame inner distance since the condition is the same as the on state; When the on-off is detected during the movement, the paper is left in the inkjet printer, and the error handling for the paper jam is performed; Checking the state of the detection sensor while moving to the point B to the left to check whether the carriage is actually at the point A if the detection sensor is changed only from the on state to the off state; If the on state is detected at point B, it is normal. If the carriage is moved to point A to move the carriage to the initial position, if it is not detected at point B, check whether it was detected before point B. Performing error processing for a paper jam because it is detected; Otherwise, if the on-state is not detected even after the carriage is moved, the carriage is out of the carriage because the carriage is out of motion. Therefore, the handling of the carriage position and the paper detection of the inkjet printer, which comprises error handling for the carriage outage Way.