JPH01301346A - Printing apparatus - Google Patents

Abstract

PURPOSE:To return continuous paper to the position before retraction even when printed continuous paper is retracted from a printing position, by a method wherein the retraction quantity of the continuous paper is stored when the continuous paper is retracted to a predetermined feed starting position from the printing position and the continuous paper after retraction is fed by retraction quantity in a printing direction. CONSTITUTION:When a bail roller 15 is allowed to be spaced apart from a platen 14 in order to use slip paper, a bail bar switch 29 is again turned ON and a paper retraction order is applied. When a CPU 21 inputs the ON-signal of a paper end switch 16, the CPU 21 feeds continuous paper in the direction reverse to a printing direction until the OFF-signal of the paper end switch 16 is inputted. The continuous paper 11 is retracted to a feed starting position from a printing position. At this time, the CPU 21 calculates the retraction quantity of the continuous paper 11 by the counting the number of steps of a stepping motor 28 and stores the calculation result in a retraction quantity memory part 24. When the CPU 21 receives an automatic load order after the retraction of the continuous paper 11, the CPU 21 feeds the continuous paper 11 after retraction by the stored retraction quantity in the printing direction and the continuous paper 11 after retraction is returned to the position before retraction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a printer device that prints using continuous paper.

(Prior Art) A printer device that prints using continuous paper has a built-in bush tractor as a continuous paper feeding mechanism. The continuous paper set on this bush tractor is conveyed to a printing start position with reference to the conveyance start position (paper end switch installation position). This automatic conveyance of continuous paper is called autoload, and a bail bar switch is used for the command. This bail bar switch is provided on a bail bar that rotatably supports the pail roller, and when the pail roller is separated from the platen,
Turn on through this bail bar.

On the other hand, this type of printer device has a continuous sheet retracting function that retracts the continuous sheet from the print position (between the tip of the print head and the platen) to the conveyance start position, that is, the installation position of the paper end switch. This command is executed when continuous paper is set in the bush tractor and you want to move the continuous paper away from the printing position, for example when printing on cut paper. A bail bar switch is used in the same way as in autoload. That is, when the power of the apparatus is turned on and the pail roller is separated from the platen, an autoload command is applied, and when the pail roller is separated from the platen again, a paper evacuation command is applied.

By the way, in the past, continuous paper with a certain amount of printing was placed at the transport start position (paper end switch installation position).
If the continuous paper is evacuated to the maximum position, there is a drawback that the continuous paper cannot be returned to the position before being evacuated by autoloading. This is due to the fact that, conventionally, the autoload conveyance control always executes conveyance by a set amount based on the conveyance start position (the installation position of the paper end switch), regardless of whether the paper is retreated. For this reason, when a continuous sheet of paper that has already been printed to some extent is automatically loaded after being evacuated, a problem arises in that the printing overlaps the already printed portion.

(Problem to be Solved by the Invention) As described above, conventionally, the autoload and paper evacuation operations were independent, so when printed continuous paper is evacuated from the printing position, it returns to the position before evacuation. There was a drawback that it could not be done.

The present invention has been made in view of the above points, and an object of the present invention is to provide a printer device that can return printed continuous paper to the position before it was evacuated even when it is evacuated from the printing position. do.

[Structure of the Invention] (Means for Solving the Problems) That is, a printer device according to the present invention is a printer device that automatically transports continuous paper set in a transport mechanism to a print start position and performs printing. When retracted from the print position to a predetermined transport start position, the retracted amount is stored, and the continuous paper after the retracted is transported in the printing direction by the retracted amount.

(Operation) According to the above configuration, the continuous sheet of paper after being evacuated is conveyed in the printing direction by the amount of evacuation. Therefore, even if the printed continuous paper is evacuated from the printing position, it can be returned to the position before being evacuated.

(Embodiment) Hereinafter, a printer device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the configuration, and the continuous paper 11 is conveyed by a bush tractor 12 to a printing position, that is, between the tip of a print head 13 and a platen 14.

The continuous paper 1 transported to the printing position is pressed against the platen 14 by the pail roller 15. This pail roller 15 is rotatably supported by a bail bar (not shown).

Further, the bush tractor 12 is provided with a paper end switch 16. This paper end switch 1
B consists of a microswitch, for example, and the continuous paper 11
This is a switch for detecting the presence or absence of.

FIG. 2 is a block diagram showing the circuit configuration of the control system of the same embodiment.
, a motor drive circuit 25, a head drive circuit 26, and an I10 boat 27 are connected thereto.

The ROM 23 stores various data necessary for printing including programs. The evacuation amount storage unit 24 stores the continuous paper 11
from the printing position to the conveyance start position (Paper end switch 1
Stores the amount of retraction when retracted to the installation position B). Motor drive circuit 25 drives step motor 28 . This step motor 28 is connected to the bush tractor 12.
and a motor for driving a paper conveyance mechanism consisting of a platen 14.

The head drive circuit 2B drives the print head 13.

! 10 boat 27 performs signal input control of paper end switch 16 and bail bar switch 29. This bail bar switch 29 is attached to a bail bar that rotatably supports the pail roller 15, and is set to turn on when the pail roller 15 is separated from the platen 14, and is configured to respond to an autoload command. Used for paper evacuation commands.

Next, the operation of this embodiment will be explained.

First, when the device power is turned on and the pail roller 15 is separated from the platen 14, the bail bar switch 29 is turned on via the bail bar, and an autoload command is applied. When the CPU 21 inputs the ON signal of the bail bar switch 29 at this time, the CPU 21 moves the continuous paper it to the transport start position (
The paper is transported in the printing direction by a preset amount from the installation position of the paper end switch 16. As a result, the continuous paper 11 is conveyed to the print position (between the tip of the print head 13 and the platen 14) and stopped at a predetermined print start position.

Such automatic conveyance of the continuous paper 11 is called autoload, and is realized by conveying the continuous paper 11 by a set amount in the printing direction based on the conveyance start position (the installation position of the paper end switch 16). Therefore, when performing autoload, it is assumed that the paper end switch 16 is turned off.

In this case, for example, if the continuous paper 11 is set on the bush tractor 12 past the paper end switch 16, the paper end switch 16 will be turned on.

Therefore, when the CPU 21 receives an autoload command and confirms the ON signal of the paper end switch 1B, the CPU 21 moves the continuous paper 11 in the opposite direction to the printing direction until the OFF signal of the paper end switch 16 is input. After being conveyed in the printing direction, the paper is conveyed by a set amount from the installation position of the paper end switch 1B in the printing direction.

Here, when the pail roller 15 is brought into contact with the platen 14 in order to press the continuous paper 11 that has been conveyed to the printing start position against the platen 14, the bail bar switch 29 is turned off.

On the other hand, if the pail roller 15 is separated from the platen 14 again due to reasons such as using cut paper,
The bail bar switch 29 is turned on again via the bail bar, and a paper evacuation command is issued.

The CPU 21 operates this second paper end switch 16.
When the ON signal is input, the continuous paper is conveyed in the opposite direction to the printing direction until the OFF signal of the paper end switch 1B is input. As a result, the continuous paper 11 is retracted from the print position (between the tip of the print head 13 and the platen 14) to the transport start position (the installation position of the paper end switch 16), as shown in FIG. 3(a). At this time, C
The PU 21 calculates the retraction amount of the continuous paper 11 by counting the number of steps of the step motor 28, and stores the result in the retraction amount storage section 24.

Here, when the pail roller 15 is brought into contact with the platen 14 again and then separated from the platen 14, an autoload command as described above is applied. However, the autoload in this case is executed based on the evacuation amount stored in the evacuation amount storage unit 24 at the time of previous paper evacuation, rather than on a preset amount. That is, the CPU 21
If an autoload command is received after the evacuation, the evacuation continuous paper 11 is conveyed in the printing direction by the evacuation amount stored in the evacuation amount storage section 24 . As a result, the continuous paper 11 after being evacuated returns to the position before being evacuated, as shown in FIG. 3(b).

In this way, the continuous paper 11 after being evacuated returns to the position before being evacuated. Therefore, continuous paper 1 that has been printed to some extent
1 is automatically loaded after being saved, it is possible to solve the problem of printing overlapping an already printed part.

[Effects of the Invention] As described above, according to the present invention, when continuous paper is evacuated from a printing position to a predetermined transport start position, the amount of retraction is memorized, and the continuous paper after being evacuated is printed. Since the continuous paper sheet is transported by the above-mentioned evacuation amount in the direction, even if the printed continuous paper is evacuated from the printing position, it can be returned to the position before evacuation.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of a printer device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the circuit configuration of the control system of the embodiment, and FIG. 3 explains the operation of the embodiment. This is a diagram for 11...Continuous paper, 12...Bush tractor, 1
3... Print head, 14... Platen, 15...
Pail roller, 16...Paper end switch, 21
...CPU. 22...System bus, 23...ROM, 24...
・°Retreat amount storage section, 25...Motor drive circuit, 26.
...Head drive circuit, 27...I10 port, 28.
...Step motor, 29...Bail bar switch. Applicant's agent Patent attorney Takehiko Suzue Figure 3

Claims (1)

[Scope of Claims] A printer device that automatically transports continuous paper set in a transport mechanism to a print start position for printing, comprising: a first transport control means for retracting the continuous paper from the printing position to a predetermined transport start position; , an evacuation amount storage means for storing the evacuation amount when the continuous paper is evacuated by the first conveyance control means; and an evacuation amount storage means for storing the evacuation amount of the continuous paper after the evacuation in the printing direction. 1. A printer device comprising: a second conveyance control means for conveying a portion of the printer.