JPS5916774A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To enable to automatically feed a paper after manually correcting a skew, by a method wherein a paper-feeding means is reversely driven by a printing paper setting command to return the leading end of a paper to a detecting position of a paper sensor, and then the paper is forwardly fed to a printing starting position. CONSTITUTION:When a printing paper 3 set in position is skewed, guide rollers 4, 5 are separated from a platen 2 by manually operating a releasing lever, and the skew is corrected. When the lever is reset and a setting switch 23 is depressed, a paper setting command signal is again given to a porgram controlling circuit. Since an output signal from the paper sensor 19 is ON, the controlling circuit 20 so functions that, in response to the setting command signal, the paper 3 is reversely fed until the leading end thereof reaches the detecting position of the sensor 19, and when the output signal from the sensor 19 is turned OFF, the paper is forwardly fed and is set into the printing starting position. Accordingly, errors in mechanical component parts are eliminated, and the paper can be automatically fed to a correct position by only the operation of supplying the paper setting command.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for a printer, and more particularly to a paper feeding device suitable for correcting skew of printing paper when printing paper cut to a predetermined size is used. .

The automatic paper feeder of a printer that uses cut paper as printing paper is
When printing paper is placed in the paper feed slot, this is detected and the paper feeding mechanism is activated to feed the printing paper to the printing start position.
It is known that when an operator operates a paper feed switch on a control panel, a paper feeding mechanism is actuated to feed printing paper to a printing start position. In this paper feeding device, if the printing paper is set skewed during paper feeding, conventionally, the printing paper is ejected without printing and re-feeded, or the guide roller is loosened and the printing paper is placed at the edge of the printing paper. After aligning and correcting the skew, the guide roller must be returned and the paper must be manually fed to the printing start position. In the former case, handling is troublesome because it is necessary to repeatedly eject and refeed the paper until no skew occurs;
In the latter case, there is a drawback that the printing paper setting position accuracy becomes poor.

SUMMARY OF THE INVENTION An object of the present invention is to propose a paper feeding device for a printer that is easy to handle and has high printing paper setting position accuracy.

The features of the present invention include a means for determining whether or not a paper sensor detects printing paper when receiving a printing paper set command, and a paper feeding means for determining whether or not the paper sensor detects printing paper. means for feeding the printing paper in a reverse direction so as to return at least the leading edge of the printing paper to the detection position of the paper sensor; and a means for driving the paper feeding means in the forward direction after the reverse feeding to perform printing. By providing a means for moving the paper forward and backward to the printing start position based on the detection signal of the paper sensor, this automates the setting of the printing paper at the printing start position after correcting the skew by manual operation. There is a particular thing.

The following description will be made based on an embodiment shown in the drawings.

FIG. 1 is a perspective view showing the outline of the mechanical configuration of the printer.
Print paper 3 wound around a platen 2 which is rotationally driven by a paper feed motor 1 is pressed against the platen 2 by a guide roller 4.5. The printing paper support system is driven in the axial direction by a slide motor 6. The type side 7 stores a large number of type bars 8 on which type is formed in a radial manner.
It is rotationally driven by a type bar selection motor 9 and axially driven by a type selection motor 10 . The selected type bar 8 is pulled out in the radial direction from the type storage 7 by a gripping mechanism driven by the type bar drive motor 11, or is pulled back into the type cloth 7 and stored therein. When the type bar 8 is pulled out, the motors 9, 10, 11 are controlled so that the character to be printed corresponds to the position of the type hammer 12, and the motors 1, 10, 11 are controlled so that the print position on the printing paper 3 corresponds to the position of the type hammer 12. 6 is controlled, and in this state, the printing number 12
By driving the ink ribbon 13, the type is pressed onto the printing paper 3 to perform printing. Note 14
is the ink ribbon feed motor.

2 and 3 are a detailed perspective view and a longitudinal side view of the platen, in which 15 is a paper holder, 16 is an end guide for positioning the left end of the printing paper 3 placed on the vapor holder 15, 17 is the guide roller 4, 5 is a release lever for pressing or releasing the platen 2, 18 is a guide plate, and 19 is a print paper sensor. The paper sensor 19 is of a reflected light detection type, and emits light from a light emitting element toward a paper detection position on the platen 2.
The reflected light is converted into an electric signal by a light receiving element, and when the printing paper 3 is present at the detection position, the output signal is turned ON.

FIG. 4 is a block diagram of the control circuit means, in which the program control circuit 20 receives commands from the operation panel 21,
Commands from 2 (print data and other print information),
Based on the output signal of the paper sensor 19, each motor 1, 6,
9, 10, 11.degree. 14 to drive and control the printing hammer 12. The operation panel 21 is also provided with a printing paper set switch 23, and when the program control circuit 20 inputs a command signal from the set switch 23, the program control circuit 20 drives the paper feed motor 1 according to the operation flowchart shown in FIG. Control.

In the above configuration, the printing paper 3 is placed on the paper holder 15.
When the set switch 23 is operated after placing the paper, a printing paper set command signal is given from the operation panel 21 to the program control circuit 20, and the program control circuit 20 sets the printing paper according to the operation flowchart shown in FIG. Execute processing.

When the set command signal is given, the paper sensor 1 is
Check whether the output signal of 9 is ON or not. Print paper 3
Since the output signal of the paper sensor 19 is OFF (OFF') only when the paper is placed on the vapor holder 15, processing 2 is performed.
6, the paper feed motor 1 is driven in the forward direction to feed the printing paper 3 by one step in the forward direction, and then the process moves to step 27.

Process 27 also checks whether the output signal of the paper sensor 19 is ON or not. If the output signal is not ON, the process returns to Process 26 and one-step paper feeding is executed again. By repeating these processes 26 and 27, the paper is fed in the forward direction until the leading edge of the printing paper 3 reaches the detection position of the paper sensor 19. When the output signal of the paper sensor 19 turns ON and this is confirmed in process 27, the process moves to process 28, where the printing paper 3 is fed in a fixed amount in the forward direction to the printing start position, and the process of setting 30 printing papers is completed. do.

If the set printing paper 3 is not skewed, the operator can issue a printing start command from the operation panel 21.
The program control circuit 20 executes printing processing according to commands from the host controller 22.

If the set printing paper 3 is skewed, the operator operates the release lever 17 to separate the guide rollers 4 and 5 from the platen 2 to free the printing paper 3. Then, the edges of the printing paper 3 are aligned to correct the skew, and the guide rollers 4.degree. 5 are again pressed against the platen 2 side to sandwich the printing paper 3. Then set switch 23
is operated to give the paper set command signal to the program control circuit 20 again. When the program control circuit 20 receives this command signal, it again executes the printing paper setting process according to the operation flowchart shown in FIG. In this process, since the output signal of the paper sensor 19 is in the ON state, the process moves from process 25 to process 29. Process 29 is to drive the paper feed motor 1 in the reverse direction to feed the printing paper 3 one step in the reverse direction, and then the process moves to process 30. Process 30 also checks whether the output signal of the paper sensor 19 is ON or not. If the output signal is ON, the process returns to process 29 and one-step paper feeding is executed again. By repeating these processes 29.degree. and 30, the printing paper 3 is fed in the opposite direction until the leading edge of the printing paper 3 reaches the detection position of the paper sensor 19. The output signal of the paper sensor 19 is OFF, which means that the process 3
If it is confirmed as 0, the process moves to step 31 and executes a process of feeding the printing paper 3 in the reverse direction by 100 steps. This process 31 is a paper feeding process for eliminating errors in mechanical components. Upon completion of process 31, the process moves to process 26, whereupon a forward paper feeding process similar to that described above is executed, and the printing paper setting process is completed.

As described above, according to the present invention, the printing paper can be automatically fed to the correct position simply by manually correcting the skew of the printing paper and then issuing a printing paper set command, making it easy to handle and set. A paper feeding device for a printer with high positional accuracy can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view schematically showing the mechanical components of the printer, FIG. 2 is a perspective view of the platen wheel, and FIG. FIG. 4 is a block diagram of the control circuit means, and FIG. 5 is a flowchart of printing paper setting processing. 1...Paper feed motor, 2...Platen, 3...Print paper, 4.5...Kite roller, 17...1 Ririnis lever, 19...Paper sensor, 20...Program control Circuit, 4m -414- 5-Fig.

Claims (1)

[Claims] 1. A platen, a guide that presses the printing paper against the platen, a release device that separates the guide from the platen, a paper sensor that detects the presence or absence of the printing paper at the detection position, a paper feeding device, and controlling the paper feeding device. and control circuit means, the control circuit means drives the paper feeding means to sequentially feed the printing paper when receiving the printing paper set command, and starts printing on the printing paper based on the detection signal of the paper sensor. In a printer's paper feed device that is designed to stop at a certain position,
The control circuit means includes means for determining whether or not the paper sensor detects printing paper when receiving a printing paper set command, and a means for determining whether or not printing paper is detected by the paper sensor for determining the printing paper, and a means for determining whether or not the printing paper is detected by the paper sensor for determining the paper feed when the printing paper sensor is detecting the printing paper. means for driving the printing paper in the reverse direction so as to return at least the leading edge of the printing paper to the detection position of the paper sensor; and driving the paper feeding means in the forward direction after the reverse feeding. A paper feeding device for a printer, comprising means for feeding printing paper in forward and reverse directions at a printing start position it based on a detection signal from the paper sensor.