JPH075214B2 - Method of controlling paper ejection from paper feed mechanism when power is turned on - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] When a device equipped with a paper feed mechanism including a paper suction port, a paper guide, a paper feed roller, and a paper discharge port is turned on, the remaining paper is discharged from the paper feed mechanism. Regarding the control method, with the aim of ensuring that the remaining paper can be discharged from the paper feed mechanism reliably and accurately, a paper detection sensor is provided near the paper inlet, and a paper detection circuit, pulse number counting unit, and counting Number holding unit,
A paper feed mechanism control unit and a paper feed roller drive unit are provided. When the paper is present on the paper detection sensor, the paper detection circuit sends a signal to that effect, and the pulse number counting unit is based on the signal from the paper detection circuit. Then, by counting the drive pulses generated by the paper feed motor drive pulse generator, the pulse after the leading edge of the paper passes over the paper detection sensor is counted to obtain the paper leading edge count number, and the trailing edge of the paper is determined. The pulses after passing through the paper detection sensor are counted to obtain the paper-free count number, and the count number holding unit holds the paper leading edge count number and the paper-free count number obtained by the pulse number counting unit in a nonvolatile manner, The paper feed mechanism control unit determines the paper-free count number held by the count number holding unit and the physical distance required for ejection from the paper feed motor. Comparing the conversion was constant pulse number, when it is determined that the remaining sheet is present, further,
When the position of the paper is judged from the count number of the leading edge of the paper held by the count number holding unit, and it is determined that a predetermined operation such as a paper pressing operation accompanying ejection is necessary depending on the position of the paper, the count number of the leading edge of the paper is determined. Based on this, the paper feed amount is obtained and a predetermined operation is performed, after which the paper feed roller drive unit is activated to discharge the remaining paper from the paper discharge port.

[Industrial application field]

The present invention relates to a method of controlling paper ejection from a paper feeding mechanism when power is turned on, and particularly when powering on a device including a paper feeding mechanism such as a printer device or an image scanner device.
The present invention relates to a control method for ejecting remaining paper from a paper feed mechanism.

[Conventional technology]

 FIG. 6 is a diagram showing a conventional example.

This conventional example shows a control method for discharging the remaining paper from the paper feeding mechanism when the power is turned on in the dot printer.

In FIG. 6, 61 is a paper feeding mechanism, 62 is a paper inlet, and 63
Is a platen, 64 is a print head, 65 is a paper guide, 66 is a paper feed roller, 67 is a paper outlet, 68 is a paper detection sensor provided near the paper intake 62, 69 is paper, and 70 is a paper detection sensor 68. A paper detection circuit for detecting the output of the paper detection sensor 68 and transmitting a signal when the paper 69 is present on the paper detection sensor 68, 71 for activating the paper feed roller drive unit based on the signal transmitted by the paper detection circuit 70. A paper feed mechanism control unit 72 for controlling whether or not is a paper feed roller drive unit for driving the paper feed roller 66 in response to a start signal from the paper feed mechanism control unit 71.

The conventional method will be described below with reference to FIG.

Turn on the printer device.

The paper detection circuit 70 detects the output of the paper detection sensor 68 and sends a signal when the paper 69 is present on the paper detection sensor 68.

The paper feed mechanism control unit 71 causes the paper detection sensor 68 to detect the paper
It is determined whether or not a signal indicating that 69 exists is transmitted from the paper detection circuit 70. Thereby, it is determined whether or not the paper 69 is present on the paper detection sensor 68.

If NO, proceed to.

If YES, execute the following processing.

The paper feed mechanism control unit 71 sends a start signal to the paper feed roller drive unit 72.

Upon receiving the start signal, the paper feed roller driving unit 72 drives the paper feed roller 66 to discharge the paper remaining in the paper feed mechanism 61 from the paper discharge port 67 to the outside.

The process proceeds to the next process as a normal printer device.

[Problems to be Solved by the Invention]

In the conventional method, if the paper is not present on the paper detection sensor when the power is turned on, it is determined that there is no remaining paper, and the paper ejection operation is not performed. There is a problem that if there is remaining paper near the paper, it will cause trouble such as paper jam.

The present invention solves this problem and allows the paper remaining in the device to be discharged reliably and accurately from the paper feeding mechanism when the power is turned on. It is an object of the present invention to provide a control method, in particular, a control method for discharging the remaining paper from the paper feed mechanism when the power of a device having a paper feed mechanism such as a printer device or an image scanner device is turned on.

[Means for Solving the Problems]

 FIG. 1 is a diagram showing the principle of the present invention.

The figure illustrates the principle of the present invention by taking a dot printer as an example.

In the figure, 1 is a paper feed mechanism, 2 is a paper inlet, 3 is a platen, 4 is a print head, 5 is a paper guide, 6 is a paper feed roller, 7 is a paper discharge port, 8 is a paper detection sensor, 9 is paper, Reference numeral 10 is a paper detection circuit, 11 is a pulse number counting unit, 12 is a count number holding unit, 13 is a paper feed mechanism control unit, 14 is a paper feed roller drive unit, and 15 is a paper feed motor drive pulse generator.

The paper feed mechanism 1 consists of a paper inlet 2, a platen 3, and a paper guide.
It is composed of a paper feed roller 6 and a paper discharge port 7.

The paper detection circuit 10 detects the output of the paper detection sensor 8 and, when the paper 9 is present on the paper detection sensor 8, sends a signal to that effect.

The pulse number counting unit 11 counts the drive pulses generated by the paper feed motor drive pulse generator 15 based on the signal from the paper detection circuit 10 so that the leading edge of the paper 9 passes over the paper detection sensor 8. Pulse is counted to obtain the paper leading edge count number, and the pulse after the trailing edge of the sheet 9 passes over the sheet detection sensor 8 is counted to obtain the paper out count number.

The count number holding unit 12 non-volatilely holds the paper leading edge count number and the no-paper count number obtained by the pulse number counting unit 11. Therefore, it is composed of EEPROM and RAM backed up by a battery.

The paper feed mechanism control unit 13 detects the count numbers held by the count number holding unit 12 from the paper detection sensor 8 and the paper discharge port 7.
When it is determined that there is remaining paper by comparing the physical distance between the paper feed roller drive unit 14 and a constant converted to the number of pulses of the paper feed motor, a start signal is sent to the paper feed roller drive unit 14.

Upon receiving the activation signal from the paper feed mechanism control unit 13, the paper feed roller drive unit 14 drives the paper feed roller 6 constituting the paper feed mechanism 1 to discharge the paper remaining in the paper feed mechanism 1 from the paper discharge port 7. .

In order to achieve the above object, the present invention is configured as follows.

In the control method for discharging the remaining paper from the paper feeding mechanism 1 when the power supply of the device having the paper feeding mechanism 1 including the paper suction port 2, the paper guide 5, the paper feeding roller 6, and the paper discharging port 7 is turned on, The paper detection sensor 8 is provided in the vicinity of the suction port 2, and the paper detection circuit 10, the pulse number counting unit 11, the count number holding unit 12, the paper feeding mechanism control unit 13 and the paper feeding roller driving unit 14 are provided. When the paper 9 is present on the paper detection sensor 8, a signal to that effect is transmitted, and the pulse number counting unit 11 generates the paper feed motor drive pulse generator 15 based on the signal from the paper detection circuit 10. By counting the drive pulses, the number of pulses after the leading edge of the sheet 9 passes over the sheet detection sensor 8 is counted to obtain the sheet leading edge count number, and the trailing edge of the sheet 9 is determined. The pulses after passing over the paper detection sensor 8 are counted to obtain the paper-free count number, and the count number holding unit 12 nonvolatilely calculates the paper leading edge count number and the paper-free count number by the pulse number counting unit 11. The paper feed mechanism control unit 13 compares the paperless count number held by the count number holding unit 12 with a constant obtained by converting the physical distance required for ejection into the pulse number of the paper feed motor, and the remaining paper When it is determined that there is a sheet, the position of the sheet is further determined from the count number of the leading edge of the sheet held by the count number holding unit 12, and a predetermined operation such as a sheet pressing operation accompanying ejection according to the position of the sheet is necessary. If it is determined that the paper feed amount is obtained based on the paper leading edge count number, a predetermined operation is performed, and then the paper feed roller driving unit 14 is activated to remove the remaining paper. Configured to discharge from the outlet 7.

[Work]

With reference to FIG. 1, a method of controlling the sheet ejection from the sheet feeding mechanism when the power is turned on according to the present invention will be described.

Turn on the printer device.

The paper feed mechanism control unit 13 determines whether or not the out-of-paper count number out of the count numbers held by the count number holding unit 12 is larger than the discharge count number required for paper discharge from the paper detection sensor 8. That is, the paper-free count number is a value obtained by counting the pulses after the trailing edge of the paper 9 passes over the paper detection sensor 8, and the discharge count number is the count number from the paper detection sensor 8 to the paper discharge port 7. Therefore, the paper is on the paper detection sensor 8 and the paper discharge port 7.
To determine whether or not it remains.

As a result, if YES, it is determined that there is no remaining paper and the process proceeds to.

If NO, it is determined that there is residual paper and the process proceeds to the next determination.

The paper feed mechanism control unit 13 checks the paper leading edge count number among the respective count numbers held by the count number holding unit 12, and determines whether or not the leading edge of the remaining paper is within the paper guide. Specifically, this determination is performed by determining the number of paper edge counts obtained by counting the pulses after the leading edge of the paper 9 passes over the application detection sensor 8 and the distance from the paper detection sensor 8 to the paper guide 5 in the paper feed motor. It is performed by comparing with a constant converted into the number of pulses of.

As a result, if YES, the process of is executed.

If NO, proceed to the next process.

Execute the paper holding operation of the remaining paper.

If the paper feed roller 6 is driven without performing this operation, a trouble such as a paper jam will occur in the paper guide 5. Therefore, the paper pressing operation for the remaining paper must be executed.

The paper feed mechanism control unit 13 sends a start signal to the paper feed roller drive unit 14.

Upon receiving the activation signal, the paper feed roller driving unit 14 drives the paper feed roller 6 to discharge the remaining paper in the paper guide 5 from the paper discharge port 7 to the outside.

The process proceeds to the next process as a normal printer device.

The method for controlling the sheet ejection from the sheet feeding mechanism when the power is turned on according to the present invention has the above-described procedure, so that the remaining sheet can be reliably and accurately ejected from the sheet feeding mechanism when the power is turned on.

〔Example〕

FIG. 2 is a diagram showing a sheet feeding mechanism according to an embodiment of the present invention.

The figure shows a paper feeding mechanism when the present invention is applied to a dot printer with a double-sided printing mechanism.

In FIG. 2, 21 is a paper inlet, 22 is a paper detection sensor,
23 is a platen, 24 is a print head, 25 is a paper guide, 26 is a paper feed roller, 27 is a paper discharge port, 28 is a path switching guide, 2
9 is a stacker.

The paper feeding mechanism shown in FIG. 2 can support double-sided printing or single-sided printing. I) In the case of double-sided printing The paper is sucked from the paper suction port 21, guided to the platen 23, printed by the print head 24, and then the paper guide 25.
Is inserted into the lower part of. Next, the sheet is guided upward by the sheet feed roller 26 and abuts on the passage switching guide 28. However, as shown in FIG. 2, when the left end of the passage switching guide 28 is in the upper side, the sheet is guided to the passage switching guide 28. It is guided in the upper part of the paper guide 25 by rotating in the clockwise direction. Then, with the already printed side down, the sheet is guided onto the platen 23, where the back side printing is performed by the print head 24. The paper on which the back side is printed is sent to the paper inlet 21 until it comes out of the double-sided printing mechanism, is sent again to the lower part of the paper guide 25, and then passes through the upper part of the paper guide 25 to the platen 23. Is guided to the paper inlet 21 until it comes out of the double-sided printing mechanism again, and then the left side of the passage switching guide 28 is switched to the lower side, and the paper is discharged to the stacker 29 through the lower part of the paper guide 25.

ii) Single-sided printing With the left end of the path switching guide 28 facing downward, set it at a position close to the large paper feed roller 26.

The paper is sucked from the paper suction port 21, guided to the platen 23, printed by the print head 24, and then the paper guide 25.
Is inserted into the lower part of. Then, the sheet feed roller 26 guides the sheet upward. Since the path switching guide 28 is set as described above, the paper passes over the path switching guide 28 and is discharged to the outside from the paper discharge port 27, and the stacker is discharged.
Stacked on 29.

An example of the system configuration when the present invention is applied to the dot printer having the paper feeding mechanism shown in FIG. 2 is shown in FIG. 3 as the system configuration of one embodiment of the present invention.

In FIG. 3, 31 is a CPU, 32 is a program storage ROM in which the procedures for executing the method of the present invention are stored, 33 is a line buffer, 34 is the detection data of the paper detection sensor and the detection data based on this detection data. The data storage RAM 35 for temporarily storing the obtained pulse number and the like corresponds to the count number holding unit 12 in FIG. 1, and is obtained by the CPU 31 according to the procedure of the method of the present invention stored in the program storage ROM 32. EEPROM for non-volatile storage of various counts, 36 is a motor driver, 37 is a hammer driver, 38 is a sensor driver, 39 is an interface, 40 is an address bus, 41 is a data bus, 4
2 is an interface cable, 43 is a main unit, 44 is a paper feed roller driving motor, 45 is an LF motor for performing line feed of the platen, 46 is a carrier moving motor,
Reference numeral 47 is a passage switching guide driving solenoid, 48 is a carrier, 49 is a print head attached to the carrier 48, 50 is an ink ribbon cassette, and 51 is various sensors including a paper detection sensor.

FIG. 4 is a diagram showing an operation flow of an embodiment of the present invention. Further, FIG. 5 is a diagram showing a state of the sheet in the sheet feeding mechanism.

With reference to FIGS. 4 and 5, in the dot printer having the paper feeding mechanism shown in FIG. 2 and having the system mechanism shown in FIG. 3, paper ejection control from the paper feeding mechanism according to the present invention when the power is turned on. The procedure of the method will be described.

Turn on the printer device.

It is checked whether or not the paper-less count number and the paper leading edge count number have changed to the state at the time of printing on the back side, and when the power was turned off last time, the paper is in the back side state as shown in FIG. 5 (a). Determine whether or not the paper remains in the paper feeding mechanism.

If YES, the process of is executed.

If NO, proceed to judgment.

As shown in FIG. 5 (a), the paper remaining in the paper feed mechanism with the paper being in the reverse state is driven toward the paper inlet 21 until it comes out of the double-sided printing mechanism by driving the paper feed roller and then again. , Feed it to the bottom of the paper guide 25, then guide it through the top of the paper guide 25 and onto the platen 23,
After the paper is fed toward the paper inlet 21 until it comes out of the double-sided printing mechanism again, the left side of the passage switching guide 28 is switched to the lower side and discharged to the stacker 29 through the lower part of the paper guide 25.

Then proceed to.

It is determined whether the no-paper count is greater than the discharge count. That is, the paper-free count number and the pulse count after the end of the paper passes over the paper detection sensor are counted, and the discharge count number is the count number from the paper detection sensor to the paper discharge port. It is determined whether or not there is a gap between the detection sensor and the sheet discharge port.

If YES, it is determined that the remaining paper does not remain and the process proceeds to.

If NO, it is determined that there is residual paper and the process proceeds to the next determination.

Of each count number, check the paper edge count number,
Determine if the leading edge of the remaining paper is in the paper guide. Specifically, this judgment is made by counting the number of pulses after the leading edge of the paper passes over the paper detection sensor and the distance from the paper detection sensor to the paper guide as the pulse number of the paper feed motor. This is done by comparing the converted constant.

FIG. 5B shows a state where the paper is inside the paper guide, and FIG. 5C shows a state where the paper is not inside the paper guide.

If YES, the process of is executed.

If NO, execute the following processing.

Execute the paper holding operation of the remaining paper.

If the paper feed roller is driven without performing this operation,
Problems such as paper jams occur in the paper guide. Therefore, the paper pressing operation for the remaining paper must be executed.

The paper feed roller is driven to discharge the remaining paper inside the paper guide from the paper discharge port to the outside.

The process proceeds to the next process as a normal printer device.

〔The invention's effect〕

According to the present invention, a method of controlling paper ejection from a paper feed mechanism when power is turned on, and particularly, when a device having a paper feed mechanism such as a printer device or an image scanner device is powered on, the remaining paper is ejected from the paper feed mechanism. In the control method for doing so, it is possible to reliably and accurately eject the remaining paper when the power is turned on from the paper feeding mechanism.

When the present invention is applied to a double-sided printing printer device,
Since the information on the front and back of the paper can be stored,
Printed sheets can be stacked without making a mistake in the page order.

[Brief description of drawings]

 FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a sheet feeding mechanism of an embodiment of the present invention, FIG. 3 is a diagram showing a system configuration of an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing an operation flow of one embodiment, FIG. 5 is a diagram showing a state of a sheet in a sheet feeding mechanism, and FIG. 6 is a diagram showing a conventional example. In Figure 1, 1: Paper feed mechanism 2: Paper suction port 3: Platen 4: Print head 5: Paper guide 6: Paper feed roller 7: Paper discharge port 8: Paper detection sensor 9: Paper 10: Paper detection circuit 11: Number of pulses Counting unit 12: Counting number holding unit 13: Paper feed mechanism control unit 14: Paper feed roller drive unit 15: Paper feed motor drive pulse generator

Claims (1)

[Claims] 1. A paper feed mechanism (1) when a device equipped with a paper feed mechanism (1) comprising a paper suction port (2), a paper guide (5), a paper feed roller (6) and a paper discharge port (7) is turned on. ), A paper detection sensor (8) is provided in the vicinity of the paper inlet (2), a paper detection circuit (10), a pulse number counting unit (11), A count holding unit (12), a paper feed mechanism control unit (13) and a paper feed roller drive unit (14) are provided, and the paper detection circuit (10) detects when the paper (9) is present on the paper detection sensor (8). By sending a signal to that effect, the pulse number counting unit (11) counts the drive pulses generated by the paper feed motor drive pulse generator (15) based on the signal from the paper detection circuit (10). , Tip of paper (9) Together determine the number of paper edge counted by counting the pulses after passing through the sheet detecting sensor (8) above, the trailing edge of the sheet paper detection sensor (9) (8)
The number of paper-free counts is obtained by counting the pulses that have passed through the top, and the count number holding unit (12) is the pulse number counting unit (11).
The paper leading edge count number and the no-paper count number obtained by are held in a non-volatile manner, and the paper feed mechanism control unit (13) is configured to hold the count number holding unit (12).
When the number of paper-free counts held by is compared with a constant obtained by converting the physical distance required for ejection into the number of pulses of the paper feed motor, and when it is determined that there is residual paper, the count-number holding unit (12 ) Determines the position of the paper from the count of the paper leading edge, and when it determines that a predetermined operation such as the paper pressing operation accompanying ejection is required depending on the position of the paper, the paper is counted based on the paper leading edge count. The paper feed roller drive unit (14) is activated to discharge the remaining paper from the paper discharge port (7). Paper ejection control method.