JPH01301343A - Printing apparatus - Google Patents

Abstract

PURPOSE:To feed continuous paper in the direction reverse to a printing direction without detaching the same from a bail roller, by a method wherein the length from the leading end part of the continuous paper to the position of the bail roller is set to reverse feed possible range when the cutting of the continuous paper is detected and the continuous paper is fed in the reverse direction. CONSTITUTION:When the ON-signal of a cutter switch 18 is inputted in cutting continuous paper 11 at a predetermined position, a paper position counter 24 is initialized. When printing is reopened after cutting, a CPU 21 makes the count value of the paper position counter 24 incremental by '1' from the initial value at each time when receives a line feed command to execute the line control of the continuous paper 11. The reverse feed possible range obtained from the count value of the paper position counter 24 is determined on the basis of the length Y from the leading end of the continuous paper 11 after cutting to the position of a bail roller 15. When the continuous paper 11 is cut, the reverse feed possible range is obtained on the basis of the leading end of the continuous paper 11 after cutting and, therefore, the continuous paper 11 can be fed in the direction reverse to the printing direction without detaching the paper from the bail roller 15.

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 bushing tractor as an example of a continuous paper feeding mechanism. The continuous paper set in this bush tractor is transported by the autoload function to the printing start position with reference to position 31 (paper end switch installation position), and is then pressed against the platen by the bail roller. It is conveyed in the printing direction for each line printed.

By the way, when conveying continuous paper from the printing position in the opposite direction to the printing direction, if a reverse conveyance command is applied that causes the leading edge of the continuous paper to pass over the bail roller, the continuous paper may come off the bail roller. Conventionally, in order to solve this problem when conveying the continuous paper in the reverse direction, the number of lines that have been printed from the print start position of the leading page of the continuous paper is counted and when the continuous paper is transported in the reverse direction. , the continuous paper was configured to be transported using the length from the leading edge of the continuous paper to the bail roller position obtained from this count value as the range in which reverse transport is possible.According to this, the leading edge of the continuous paper was configured to be able to move past the bail roller. Even if a reverse conveyance command is applied, the continuous paper is conveyed within the range in which reverse conveyance is possible, so it will not come off the bail roller.

However, in printers that use continuous paper,
The main body of the apparatus is equipped with a cutter, and the cutter is used to cut continuous paper at predetermined positions. For this reason, if a reverse conveyance command is applied to the continuous paper after cutting, such as the one described above that would cause the leading edge of the continuous paper to pass the bail roller, the possible reverse transport range will change based on the leading edge of the continuous paper before cutting. Conventional control that achieves this has the disadvantage that the continuous paper comes off the bail roller.

(Problems to be Solved by the Invention) As described above, conventionally, when continuous paper after cutting is conveyed from a printing position in a direction opposite to the printing direction, there is a possibility that the continuous paper may come off the bail roller.

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 transport continuous paper after cutting in a direction opposite to the printing direction without removing it from the bail roller.

[Structure of the Invention] (Means for Solving the Problems) That is, a printer device according to the present invention is a printer device that prints by pressing continuous paper conveyed to a printing position against a platen with a bail roller. A detection means for detecting that the paper has been cut is provided, and when the cutting of the continuous paper is detected by this detection means, the count value of the line management means is initialized, and the continuous paper is moved from the printing position in the opposite direction to the printing direction. When conveying the continuous sheet in the direction, the length from the leading end of the continuous sheet to the position of the bail roller obtained from the count value of the line management means is set as the range in which the continuous sheet can be conveyed in the reverse direction.

The line management means counts how many lines have been printed from the leading edge of continuous paper.

(Operation) According to the above configuration, line management is executed according to cutting of continuous paper. Therefore, the continuous paper after cutting can be transported in the opposite direction to the printing direction without removing it from the bail roller.

(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 roller 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 11 that has been conveyed to the printing position is pressed against the platen 14 by the bail roller 15. This bail roller 15 is rotatably supported by a pail bar (not shown).

The bush tractor 12 is also provided with a vapor end switch IB. This paper end switch 1
B consists of a micro switch, for example, and continuous paper ■1
This is a switch for detecting the presence or absence of.

The cutter 17 is rotatably attached to a predetermined axis as a fulcrum, and when it is at the position shown by the dotted line, it can cut the continuous paper 11 that is being conveyed to the printing position.

In this case, when the cutter 17 is at the position indicated by the dotted line (on the platen 14 side), it is set at a position where it can cut the continuous paper 11 with a margin of 1 inch from the printing position. The cutter 17 is also provided with a cutter switch 18 that is turned on/off depending on the rotational position of the cutter 17. This cutter switch 18 is used to detect cutting of the continuous paper 11, and when the cutter 17 is rotated to the position shown by the dotted line, that is, the continuous paper 11 is cut using the cutter 17. Turn on when.

FIG. 2 is a block diagram showing the circuit configuration of the control system of the same embodiment. A CPU 2L that controls the entire apparatus is connected to a ROM 23, a paper position counter 24, a motor drive circuit 25, and a head via a system bus 22. Drive circuit 26, I1
0 boats 27 are connected to each.

The ROM 23 stores various data necessary for printing including programs. The paper position counter 24 counts how many lines have been printed from the leading edge of the continuous paper ti, and when the continuous paper 11 is cut by the cutter 17, the count value is initialized. Note that this paper position counter 24 is allocated to a certain area in a RAM (not shown).

Motor drive circuit 25 drives step motor 28 . This step motor 28 is a motor for driving a paper conveyance mechanism consisting of a bush tractor 12 and a platen 14. The head drive circuit 26 drives the print head 1
Drive 3. The I10 boat 27 performs manual signal control of the paper end switch 16 and cutter switch 18.

Next, the operation of this embodiment will be explained.

The continuous paper 11 set in the bush tractor 12 is
Conveyance start position (installation position of paper end switch 16)
The sheet is conveyed to the printing start position by the autoload function based on , and thereafter conveyed in the printing direction for each line of printing while being pressed against the platen 14 by the bail roller 15 .

In this case, each time the CPU 21 receives a line feed command transferred from a host device (not shown), the CPU 21 increments the count value of the paper position counter 24 by "+1" from the initial value, and executes line management of the continuous paper 11. are doing. That is, the paper position counter 24 counts how many lines have been printed from the leading edge of the continuous paper 11. When the continuous paper 11 is not cut, the count value of the paper position counter 24 is as shown in FIG. 3(a).
1 to the position of the bail roller 15.

Here, when a reverse transport command for the continuous paper 11 is issued through the host device, the CPU 21 transports the continuous paper with the above-mentioned length X set as a possible reverse transport range. As a result, continuous paper 11
Even if a reverse conveyance command is applied such that the leading edge of the paper passes the bail roller 15, the continuous paper 11 will stop at the bail roller 15 and will not come off the bail roller 15.

On the other hand, when cutting the continuous paper 11 at a predetermined position after a certain amount of printing has been performed, the cutter 17 is rotated toward the platen 14, as shown in FIG. 3(b). When the cutter 17 is rotated toward the platen 14, the cutter switch 18 is turned on. When the CPU 21 receives the ON signal of the cutter switch 18, it initializes the paper position counter 24.

Then, when printing is restarted after cutting the continuous paper 11, the CPU 21 increments the count value of the paper position counter 24 by "+1" from the initial value every time it receives a line feed command in the same manner as described above, and continues printing. Executes line management of paper 11. In this case, line management is performed according to the cutting of the continuous paper 11, and the possible reverse transport range obtained from the count value of the paper position counter 24 is the range after cutting as shown in FIG. 3(c). Length Y from the leading edge of continuous paper 11 to the position of bail roller 15
determined by

Therefore, even if a reverse conveyance command is applied such that the leading edge of the continuous paper 11 passes over the bail roller 15 after cutting the continuous paper 11, the continuous paper 11 will stop at the bail roller 15 and will not come off the bail roller 15. do not have.

In this way, when the continuous paper 11 is cut, in order to obtain a range in which reverse transport is possible based on the leading edge of the continuous paper 11 after cutting, the printing direction can be changed without removing the continuous paper 11 after cutting from the bail roller 15. It can be transported in the opposite direction.

[Effects of the Invention] As described above, according to the present invention, when the count value of the line management means is initialized in response to cutting of continuous paper, and the continuous paper is conveyed from the printing position in the opposite direction to the printing direction,
Since the continuous paper is conveyed using the length from the leading edge of the continuous paper obtained from the count value of the line management means to the position of the bail roller as the reverse transport possible range, the continuous paper after cutting is removed from the bail roller. It is possible to convey the paper in the opposite direction to the printing direction without any trouble.

[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 it...Continuous paper, 12...Butsutractor, 1
3... Print head, 14... Platen, 15...
Bail roller, 1B...vapor end switch, 17
... cutter, 18 ... cutter switch, 21.
...CPU. 22...System bus, 23...ROM, 24...
・Paper position counter, 25...Motor drive circuit, 26
...Head drive circuit, 27...I10 port, 28
...Step motor. Applicant's agent Patent attorney Takehiro Suzue 2

Claims (1)

[Claims] A printer device that prints by pressing continuous paper conveyed to a printing position against a platen by a bail roller, comprising: a cutter that cuts the continuous paper at a predetermined position; and a cutter that cuts the continuous paper at a predetermined position. and a line management means that counts how many lines have been printed from the leading edge of the continuous paper, and when the detection means detects cutting of the continuous paper, the count value is initialized. a line management means; when conveying continuous paper from a printing position in a direction opposite to the printing direction, the length from the leading edge of the continuous paper obtained from the count value of the line management means to the position of the bail roller can be reversely conveyed; A printer device comprising a conveyance control means for conveying continuous paper.