KR100416554B1 - Paper feeding control method of printing apparatus - Google Patents

Abstract

Disclosed is a paper feeding control method of a printing apparatus. The paper feed control method described above drives the pickup roller and feed roller when a print signal is input, and then checks whether the jam zero sensor located between the pickup roller and the feed roller is turned on. In the first step of processing, and the jam zero sensor is turned on, the pickup roller is turned off after a predetermined time so as to extend the feeding interval of paper, and then the registration sensor is checked to be turned on, and the registration sensor is turned off for a predetermined time. A second step of processing the jam if it continues, a third step of setting the next print signal check time when the registration sensor is turned on, and a next print signal if the on-state time of the registration sensor is greater than the next print signal check time. The on-state time of the registration sensor is greater than the next print signal check time. In this case, the fourth step of continuously measuring the on state of the registration sensor and the following steps from the first to the fourth step if the next printer signal is present and ending the print job if the next printer signal is not present. A fifth step is included. The present invention can maintain the paper feed interval constant regardless of the remaining amount of paper or environmental changes inside the printing machine.

Description

Paper feeding control method of printing apparatus

The present invention relates to a paper feeding control method of a printing apparatus, and more particularly, to a paper feeding control method that can make a feeding interval constant in a printing apparatus for continuous feeding.

Generally, a paper feeder of a printing machine such as a printer or a copier includes a tray 11 on which the paper S is loaded and a paper S loaded on the tray 11, as shown in FIGS. 1A and 1B. A pickup roller 13 for moving sheet by sheet, a feed roller 19 for placing a paper S positioned in the front of the pickup roller 13 and moving from the pickup roller 13 toward a developing machine (not shown), and a sheet of paper. As printing of S progresses, the spring 16 which raises the height of the plate 15 in which the paper S is located to an appropriate height is provided.

In the paper feeding device of the conventional printing machine, a lifting device such as a spring 16 is separately provided so that the distance from the pickup roller 13 to the registration sensor (not shown) is kept constant for a constant supply of the paper S. Alternatively, the remaining amount of the paper S loaded on the tray 11 is measured through a sensor to maintain a constant feeding interval.

However, when the remaining amount of paper (S) is measured through the sensor, an error may occur in the remaining value of the paper (S) according to the performance of the sensor, in which case the feeding interval is not constant, the output may not be made normally. have.

In addition, when a separate lifting device is provided, it may be difficult to maintain an appropriate height depending on the thickness or type of the paper S. FIG. In order to solve this problem, the pickup roller 13 is directly lifted and fed without a lifting device, but in this case, the distance between the pickup roller 13 and the registration sensor is not kept constant. Method is required.

Therefore, the technical problem to be achieved by the present invention is to improve the above-described problems of the prior art, it is difficult to precisely measure the paper residual sensor in the printing device, such as a printer or copier, or to directly raise and lower the pickup roller without a lifting device. To provide a paper feed control method to maintain a constant paper feed interval.

1A is an exploded perspective view briefly showing a conventional paper feeder,

1B is a sectional view schematically showing a conventional paper feeder,

2 is a perspective view showing a printing apparatus to which a paper feeding control method is applied according to an embodiment of the present invention;

3 is a flow chart showing a paper feeding control method according to an embodiment of the present invention.

<Code Description of Main Parts of Drawing>

10: tray 11: tray

13, 33: pickup roller 15: plate

16: compression spring 17: stopper

19, 39: feed roller 30: printing machine

31: remaining amount sensor 35: registration sensor

In order to achieve the above technical problem, the present invention, the pickup roller for moving the paper by rotating in close contact with the paper, the feed roller which is located in the traveling direction of the paper and enters the paper into the developing machine, and the pickup roller and In the paper feed control method of the printing machine having a jam sensor located between the feed roller and the registration sensor provided in front of the feed roller, the print roller is driven when the pickup roller and the feed roller is driven, And a first step of checking whether the jam zero sensor positioned between the feed rollers and the jam zero sensor is turned on, and processing the jam when the jam zero sensor lasts for a predetermined time; and when the jam zero sensor is turned on, the paper After the predetermined time has elapsed to extend the feed interval of the paper, the pickup roller is turned off, and then the registration sensor A second step of processing a jam when the off state of the registration sensor continues for a predetermined time; and a third step of setting a next print signal check time when the registration sensor is turned on; and on of the registration sensor Checking the next print signal when the state time is greater than the next print signal check time, and continuously measuring the on state of the registration sensor when the on state time of the registration sensor is less than the next print signal check time. The fourth step; And a fifth step of repeating the steps from the first to the fourth step if the next printer signal exists, and terminating a print job if the next printer signal does not exist. Provide control method.

In the third step, the reference time is set to the next print signal check time when the difference between the two times is greater than a predetermined limit by comparing the driving time of the pickup roller with the reference time according to the remaining amount of paper, and is less than or equal to the predetermined limit value. In this case, the difference between the output time of the printer and the drive time of the pickup roller is set as the next print signal check time.

The present invention keeps the feeding interval constant when continuous feeding in the printing machine. In particular, we propose an algorithm to control the feed gap using the existing paper remaining sensor and registration sensor when the remaining amount of paper cannot be accurately measured or when there is no lifting device.

Hereinafter, an embodiment of a paper feeding control method of a printing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used for the same components, even if displayed on different drawings.

2 is a view showing a printing apparatus to which a paper feeding control method according to an embodiment of the present invention is applied.

Referring to FIG. 2, the printing apparatus to which the paper feeding control method according to the embodiment of the present invention is applied is in close contact with the tray 32 on which the paper s is loaded and the paper s loaded on the tray 32. A pickup roller 33 for moving the paper s by rotation, a feed roller 39 for moving the paper s into the developing machine, which is located in the advancing direction of the paper s, and a tray 32. It is positioned between the pickup roller 33 and the pickup roller 33 and the feed roller 39 to detect the remaining amount of the paper (s) and is connected to the pickup roller 33 at the upper end of the paper (s). The jam zero sensor 35, which is turned on when it comes in contact with the paper s, and the registration sensor 37, which is installed at the upper end of the paper s entering from the feed roller 39, detects the registration of the developed image. Equipped. The illustrated printing apparatus is provided with the above structure in the upper structure and the lower structure in the same way.

The paper remaining sensor 31 is a slide resistance element functioning as an analog to digital converter (ADC), and the slide bar moves due to the decrease of the paper s, and electrically detects the resistance value according to the movement of the slide bar. Measure the remaining amount of s). However, the paper remaining amount sensor 31 may not accurately detect the remaining amount of the paper s depending on the type or thickness of the paper s.

When the jam zero sensor 35 is in the off state and the connected actuator is in contact with the paper s and changes the jam zero sensor 35 to the on state, the jam zero sensor 35 detects this signal and the driving of the pickup motor is delayed after a predetermined time. Stop

This time is determined by adding a margin to the distance from the jam zero sensor 35 to the feed roller 39 and is about 250 ms. In the above operation, the speed limit of the paper s is changed from the pickup roller 33 to the feed roller 39, and the pickup roller 33 waits in the off state for the pickup of the next paper s.

As the printing apparatus becomes larger, the pick-up roller 33 does not contact the paper s until the paper s enters the feed roller 39 so that the pick-up roller 33 idles or the paper s picks-up roller. There are many cases where crumpling past (33) occurs. If the paper s does not reach the jam zero sensor 35 for the above-described reason, the jam zero sensor 35 is kept in the off state.

The registration sensor 37 is a sensor for measuring the error of the color arrangement of the image to be developed. In the present invention, the registration sensor 37 is used as an element for checking whether the paper s has advanced to the portion where the developing device is located. That is, the time point at which the initial pulse generated by the registration sensor 37 operates and outputs is the time point at which the registration sensor 37 is turned on, and when the registration sensor 37 is not operated, the paper s until the registration sensor 37. Since the paper is not fed, the paper s is jammed between the registration sensor 37 in the feed roller 39.

When there is a lifting device such as a spring at the bottom of the plate of the tray for loading the paper s, the paper s is lifted to maintain a certain height according to the remaining amount. However, when there is no lifting device described above, the printing apparatus may further include an arm 32 supporting the pickup roller 33 so that the pickup roller 33 may come into contact with the paper s.

In the printing apparatus having a lifting device, the distance between the pickup roller 33 and the feed roller 39 is kept constant, but the paper remaining sensor 31 does not accurately measure the remaining amount of paper s. It is possible to maintain a constant feeding interval by applying the feeding control method according to.

In a printing machine without a lifting device, the pickup roller 33 moves up and down according to the remaining amount of paper s, so that the distance between the pickup roller 33 and the feed roller 39 is not constant, thereby maintaining a constant feeding interval. In order to apply the feed control method according to an embodiment of the present invention can be applied.

3 is a flowchart illustrating a paper feeding control method according to an embodiment of the present invention.

Referring to FIG. 3, when a printer signal instructing to start printing is input from a control device such as a computer (step 101), the pickup roller 33 and the feed roller 39 in the printing machine start driving and jam count. The pick-up count becomes 0. (Step 102) In step 101, if there is no printer signal, the standby state is maintained. Here, the jam count means the time that the jam sensor 35 is kept off, starting at the time of pickup, and the pickup count means the time when the pickup roller 33 is driven.

The pickup roller 33, which has started driving in step 102, takes out the sheets of paper s loaded on the tray one by one and advances them toward the feed roller 39. As described above, the jam zero sensor 35 positioned between the pickup roller 33 and the feed roller 39 is turned on at the moment when the paper s comes into contact with the actuator (103). In operation 104, the pickup roller 33 is stopped after a predetermined time, for example, 250 ms, from the time when the jam zero sensor 35 is turned on to secure the next paper feed interval (step 104). When the roller 33 is off, the jam count is made zero at that time. Here 250 ms is an exemplary time and may vary depending on the type of printing machine and the roller driving speed.

If the jam zero sensor 35 is not turned on in step 103, the jam count and the pickup count are continued (step 106) and the jam count is checked for 2 seconds or more. (Step 107) If the count is less than 2 seconds, the process returns to step 103 and if the jam count has elapsed for 2 seconds, the jam is processed. (Step 118) The jam count may be determined differently according to the internal environment of the printing machine. have.

In step 104, the paper s entering the inside of the printing apparatus advances into the developer by the feed roller 39, and the registration sensor 37 detects an image developed on the paper s. (Step 107), the registration count is set to zero (110). The registration count refers to the time for which the registration sensor remains on.

In step 107, when the off state of the registration sensor 37 proceeds for a predetermined time, the jam count and the pickup count are also progressed. (Step 108) In step 108, the jam count is checked (step 109). If the jam count is less than 1 second, the process returns to step 107 and if the jam count has passed 1 second, the process is processed as jam.

In step 110, if the registration count is 0, the pickup count advanced to the present step is compared with a reference count [ADC] presented from the lookup table of the paper remaining sensor 31, and the difference is a predetermined threshold value, for example. If it is 50 ms or more (step 111), it means that the pickup count is greater than or equal to the reference count due to slip of the pickup roller 33 or locking of the pickup roller 33. Leave [ADC] checked to check the printer signal (step 114).

However, if the difference between the pick-up count and the reference count is less than or equal to a predetermined threshold value of 50 ms in step 111, the next printer check time is obtained by subtracting the pick-up count from 1.71 seconds (step 112). In the case of 35PPM (Page Per Minute), this is the time interval in which one sheet (s) is output. This time is not a specified time and may vary depending on the output speed depending on the type of each paper s.

The reference count is a reference time when the paper remaining amount detection sensor checks the remaining amount of paper, measures the next print signal check time according to the remaining amount of paper, and presents it as a lookup table. By providing such a look-up table, it is possible to prevent a phenomenon in which pick-up time of the next sheet s is accelerated due to the delay of paper feeding due to slip or locking of the pick-up roller 33 and to maintain the paper feed interval appropriately.

In step 112 and 114, the registration count proceeded from the time when the registration sensor 37 is turned on (step 116), and the registration count is determined in step 112 or 114. If it is greater than the check time, it is checked whether the next printer signal is input. If the registration count does not reach the next printer check time, the registration count is continued. (Step 113) After the step 113, the next print signal is input. If there is no printer signal, the printing operation is continued and the printing operation is terminated.

The paper feed control method according to an embodiment of the present invention can be kept constant by compensating for the difference in paper feed gap according to the paper remaining amount measured from the paper remaining sensor, and is especially applied to a printing machine without a lifting device to feed from a pickup roller. It is possible to efficiently compensate for the difference in paper feed interval as the distance to the roller is changed.

While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention.

For example, a person having ordinary knowledge in the technical field to which the present invention belongs may change a predetermined limit time such as a next printer check time and a zero measurement sensor or a registration sensor according to the output speed of the printing device according to the technical idea of the present invention. Could be. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical spirit described in the claims.

As described above, an advantage of the feeding control method of the printing apparatus according to the present invention is that, even when the distance between the pickup roller and the feed roller is changed or a jam occurs, the feeding interval can be kept constant regardless of the remaining amount of paper. will be.

Claims (2)

A pick-up roller which moves the paper by rotating in close contact with the paper, a feed roller which is located in a traveling direction of the paper and enters the paper into a developing machine, a jam sensor located between the pick-up roller and the feed roller, and a feed In the paper feed control method of the printing apparatus having a registration sensor provided in front of the roller, When the print signal is input, the pickup roller and the feed roller are driven. Then, the jam zero sensor positioned between the pickup roller and the feed roller is checked. If the jam zero sensor is turned off for a predetermined time, the jam is jammed. A first step of processing; When the jam zero sensor is turned on, after the predetermined time elapses to extend the paper feed interval of the paper, the pickup roller is turned off, and then the registration sensor is checked to be turned on, and the off state of the registration sensor is maintained for a predetermined time. A second step of processing into a jam; Setting a next print signal check time when the registration sensor is turned on; When the on state time of the registration sensor is greater than the next print signal check time, the next print signal is checked. When the on state time of the registration sensor is less than the next print signal check time, the on state of the registration sensor is changed. A fourth step of continuously measuring time; And And a fifth step of repeating the steps from the first to the fourth step if the next printer signal exists, and terminating a print job if the next printer signal does not exist. Way. The method of claim 1, wherein in the third step, The reference time is set as the next print signal check time when the difference between the two times is greater than a predetermined limit by comparing the driving time of the pickup roller with the reference time according to the remaining amount of paper. And a time difference between the drive time of the pick-up roller and the next print signal check time.