JPS63114680A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To prevent an error in a printing position on a paper from being generated at the time of restarting printing, by providing a controlling means for such a control that a stepping motor is maintained in the phase in which it is stopped at the time of resetting or when a cover is opened, and thereafter the motor is restarted at the stop position. CONSTITUTION:Operations of a stepping motor 55 for type selection, a stepping motor 90 for a carriage, a stepping motor 100 for line feeding, a printing head 20 and the like are controlled by an electronic controller 110. It is discriminated in a step S2 whether data is inputted, and when data is inputted, it is discriminated in steps S3, S6, S8, S11 what the data is. For example, when the data is discriminated as a reset signal in the step S8, all of the stepping motors are stopped in a step S9. Thereafter, detection of original points of the carriage 70 and a daisy wheel and initialization of the stepping motors and the like are performed in a step S10. In this case, the stepping motor 100 for line feeding is not reset to an initial position but is excited from the stopped state, whereas the other stepping motors are excited into initial phases.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device, and more specifically, a printing device equipped with a mechanism that stops paper feeding when reset or when the cover of the printer is opened. The present invention relates to a paper feeding device.

[Prior Art] Conventionally, in a printing device equipped with this type of stop mechanism, when the cover is opened or when a set signal is output from an external device such as a personal computer, a stepping motor for line feed, etc. that feeds the paper is stopped. The various motors are stopped, and when the printing process is restarted, the motors are initialized to a predetermined phase (for example, CD phase) and then printing is restarted.

[Problem to be solved by the invention] However, when the line feed stepping motor stops at a phase other than the initial setting (for example, AB phase), if the stepping motor is initialized as described above, Since the paper is fed, there is a problem that when printing is restarted, the printed line is shifted from before it stopped.

[Means for Solving the Problems] As shown in FIG. 1, the present invention, which has been made to solve the above-mentioned problems, is based on an initial step in which the stepping motor A for paper feeding is initially set to a predetermined phase at the time of startup. In a printing apparatus comprising a setting means B and a stopping means C for stopping the rotation of the stepping motor A at the time of reset and/or when the cover of the printing apparatus is opened, the motor A is stopped at the time of reset and/or when the cover is opened. The present invention is characterized by comprising a control means for controlling the stepping motor A to be held in the same phase as it is and to be restarted from the stopped position.

Although FIG. 1 depicts a columnar platen as a paper feeding mechanism, a paper feeding mechanism including a plurality of rollers or the like may be used without using a columnar platen.

[Operation] In the paper feeding device of the printing apparatus of the present invention, the paper is fed by the stepping motor A for paper feeding.

Then, upon startup, the stepping motor A is excited to a predetermined phase for initialization.

Furthermore, even if the printing device is in operation, the stepping motor A is stopped by the stopping means C when resetting or opening the cover.
stops, and the printing operation including paper feeding stops. Thereafter, when printing is resumed, initial settings of the stepping motor A and the like are performed by the control means.

In this initial setting, the paper feeding stepping motor A is not set to the initial phase at the time of reset and/or when the cover is opened, but is maintained at the stopped phase, and is started from the stopped phase.

Therefore, the phase of stepping motor A is not aligned when resetting or opening/closing the cover, and stepping motor A
does not rotate, so the printing position on the paper does not shift.

[Example] Implementation 1 of the present invention? The present invention is not limited to this, and various explanations may be made without departing from the gist thereof. Includes Mr. J's.

FIG. 2 is a diagram showing the configuration of a printer to which the present invention is applied.

This printer 10 prints on a paper 40 set on a platen 30 using a print head 20 composed of a daisy wheel and a print hammer. The print head 20 is attached to a carriage 70 that is slidably supported on a guide shaft 60 together with a print ribbon 50, and characters are selected by a stepping motor 55 for character selection. The carriage 70 is driven by a carriage stepping motor 90 via a belt 80, and moves the print head 20 to a predetermined position along the longitudinal direction of the platen 30. Further, the platen 30 is driven by a line feed stepping motor 100 connected via a gear,
move it into place.

The operations of the above-mentioned stepping motor 55, 90, 100, print head 20, etc. are controlled by an electronic control unit 110. Further, the electronic control device 110 includes an external device 105.
Signals such as data from the power supply switch 120 and signals from various switches, such as a cover open signal and a cover close signal from a cover open sensor 140 provided on the power switch 120 and the cover 130, are input.

The electronic control device 110 described above includes a well-known CPU 200, R
In addition to the OM 210 and the RAM 220, it includes an input/output board 230 that converts input/output signals from the motors, switches, and sensors into signals that can be processed by the CPU 200, a common bus 240 that connects these, and the like.

Next, the flowchart shown in FIG. 3 stored in the ROM 210 of the electronic control unit 110 will be explained.

First, when the power is turned on, in step Sl (hereinafter simply referred to as Sl, and the same applies to other steps), the initial settings at power-on are performed, such as detecting the origin of the carriage 70 and daisy wheel, and setting other stepping motors. A process is performed to set the initial phase to the initial phase.

At this time, for example, the line feed (LP) stepping motor 100 is excited to the CD phase. Next, it is determined in S2 whether or not data has been input, and when data has been input, it is determined in S3, S6, S8, and Sll what the data is. If it is determined in S3 that it is print data, it is determined in S4 whether or not printing is possible, that is, whether the cover is open or not.
Alternatively, whether or not another interrupt process is being executed is determined based on the state of the flag. When it is determined in S4 that the flag is not set and printing is possible, printing processing is executed in S5, and after that processing, the process returns to 82.

Next, if it is determined in S6 that the data is not interrupt data, other data processing is performed in S7, and the next 88
When it is determined that the signal is a reset signal, all stepping motors are stopped in S9, and then in S10.
Detection of the origin of the carriage 70 and the daisy wheel, initial setting processing of the stepping motor, etc. are performed at the step. In this process, the LF stepping motor 100 is not set to the initial position (excitation of CD phase), but is excited from the state at the time of stop, and the other stepping motors are excited to the initially set phase.

Next, when it is determined in Sll that the signal is a cover oven signal based on the cover opening sensor 140, a predetermined cover oven process is performed in S12, and then each stepping motor is stopped, and the cover 130 is Waits in that state until it is enchanted.

Then, when the cover 130 is opened, a cover close signal is inputted from the cover detection sensor 140, the determination result in S13 becomes YES, and the next step 814 is to initialize 7A.
principles are carried out. This process is the same as S10 above,
Carriage origin detection and LP stepping motor 1
Excite the stepping motor other than 00 to the initial phase, and
The F stepping motor 100 is excited from the phase at which it stopped. On the other hand, if it is determined in Sll that the signal is not a cover oven signal, an interrupt process is executed in S15, and the process returns to S2.

Therefore, by executing flowchart 1 in Figure 3,
During printing, if the cover 130 is opened or if the external device 105
The printer immediately stops when a reset signal is input from the printer, but when printing resumes, the LP stepping motor 100 is excited from the phase at which it stopped, so the printing position does not shift.

[Effects of the Invention] As explained above, according to the present invention, when the cover of the printing device is opened or reset, the printing device stops immediately, and when printing resumes, the printing position on the paper does not shift.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the structure of the present invention, FIG. 2 is a block diagram showing the structure of a printer according to an embodiment of the present invention, and FIG. 3 is a flowchart of processing in the same embodiment. A...Stepping motor B...Initial setting means C...Stopping means D...Control means 100...Stepping motor 11 for line feed
0...Electronic control device 130...Cover 140・
・Cover opening/closing sensor

Claims (1)

[Scope of Claims] An initial setting means for initially setting a stepping motor for paper feeding to a predetermined phase at startup, and a stopping means for stopping the rotation of the stepping motor at the time of reset and/or when the cover of the printing device is opened. In the paper feeding device of a printing device, the stepper motor is controlled to hold the stepping motor in the stopped phase at the time of reset and/or when the cover is opened, and to restart the stepping motor from the stopped position. A paper feeding device for a printing device characterized by: