JPS6230067A - Preventing system for jamming - Google Patents

Abstract

PURPOSE:To prevent a jam by simple constitution by stopping a driving system for a printer just when an information from a rotary-cutter position detecting means does not return to a normal state. CONSTITUTION:With a rotary-cutter position detecting means 20, a cam 22 with a projection is mounted to a shaft 21 for a rotary knife for a rotary cutter, and a switch 23 is fitted at a position where the projection 22a for the cam 22 pushes down a switch lever 23a at the normal position of stoppage of the rotary knife. When a printer is operated normally, a signal from the switch 23 is at ON on the stoppage of the rotary knife as shown in (a) and is at OFF during the revolution of the rotary knife for cutting the sheet of paper, and ON and OFF are repeated at predetermined periods. A control circuit investigates a point A immediately after a point of time when the signal is changed over to OFF from ON on the starting of printing, and stops a driving system for the printer and suspends the operation of recording when the signal is not normal.

Description

[Detailed Description of the Invention] [(Already required)] A jam prevention method for a printer using roll type recording paper, which is provided with a rotary cutter position detection means, and a control unit that detects information from the rotary cutter position detection means in a normal manner. If the printer does not recover, the drive system of the printer is immediately stopped to prevent jamming.

[Industrial application field]

The present invention relates to a jam prevention method in a printer, and more specifically, to a jam prevention method for a printer equipped with a rotary cutter and using roll-type recording paper.

[Conventional technology]

FIG. 3 is a diagram showing a conventional thermal printer.

This printer has a power supply circuit 2 and a drive motor 4 inside the outside N1.
, control 4 circuits 5, thermal head 6, platen 7,
A cutter 8 and the like are provided, and after printing is performed on the roll type recording paper 3 by a thermal head 6, a rotary cutter 8 consisting of a rotary blade 10 and a fixed blade 11 as shown in FIG. 4 is used to print one page at a time. It is designed to be cut and discharged.

[Problem that the invention seeks to solve]

In the conventional printer described above, the printed recording paper 9 may not be completely ejected. In such a case, the rotary cutter 8 will cut two sheets one on top of the other when cutting the next sheet, but the rotary blade 10 does not have that much rotational force (
It stops in the middle of cutting. As a result, the recording paper 3 jams and gets wrapped around the platen 7 due to its curl.
The drawback was that it took time to recover.

The present invention was created in view of these points, and an object of the present invention is to provide a jam prevention method that has a simple configuration and is capable of preventing jams.

[Means for solving problems]

For this reason, the present invention provides a jam prevention method for a printer that is equipped with a rotary cutter and cuts a roll of recording paper after printing into one page at a time and discharges the paper, the rotary cutter's rotary blade A rotary cutter position detecting means 20 consisting of a cam 22 attached to a shaft 21 and a switch 23 operated by the cam 22 is provided, and if the information from the detecting means 20 does not return normally, the printer drive system is immediately It is characterized by stopping.

[For production]

The rotary cutter position detection means detects the position of the rotary blade, and if the stop position is not normal, the drive system of the printer is immediately stopped, thereby making it possible to prevent jamming.

〔Example〕

1 and 2 are diagrams for explaining the present invention in detail. FIG. 1 is a diagram showing a rotary cutter position detection means, and FIG. 2 is a diagram showing signals from a switch.

As shown in FIG. 1, the rotary cutter position detecting means 20 has a cam 22 with a protrusion attached to the shaft 21 of the rotary cutter's rotary cutter, and a protrusion 22a of the cam 22 is switched when the rotary cutter is in the normal stop position. Lever 23
A switch 23 is provided at a position where a is pressed.

As shown in Figure 2, the signal from the switch 23 is ON when the printer is operating normally, when the rotary blade is stopped as shown in a, and OFF when the rotary blade is rotating to cut paper.
It becomes FF and repeats ON and OFF at a constant cycle. In this embodiment, the control circuit turns this signal from ON to OFF.
Check point A immediately after the point where it switches to when printing starts,
If the signal is not normal, the drive system of the printer is stopped and the recording operation is stopped.

In this embodiment configured as described above, when paper jams in front of the rotary cutter, the leading edge of the paper being recorded enters the rotary cutter before the paper has finished passing through the rotary cutter, causing rotary force and slippage. - is unable to cut the paper and stops at a position deviated from the normal stop position, so the signal from the switch 23 continues to turn ON as shown in FIG. 2. Therefore, the control circuit that checks point A at the start of printing detects that it is not normal and stops the drive system. This stops paper feeding and prevents jamming.

〔Effect of the invention〕

As described above, according to the present invention, jamming can be prevented with an extremely simple configuration, and it is extremely useful in practice.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining the present invention in detail. FIG. 1 is a diagram showing the rotary cutter position detection means, FIG. 2 is a diagram showing signals from the switch, and FIG. 3 is a diagram showing the rotary cutter position detection means. FIG. 4 is a diagram showing the rotary force and tumble of the conventional thermal printer. In FIG. 1, 20 is a rotary cutter position detection means, 21 is a shaft of a rotary cutter of the rotary cutter, 22 is a cam, 22a is a protrusion of the cam, and 23 is a switch.

Claims (1)

[Scope of Claims] 1. A jam prevention method for a printer that is equipped with a rotary cutter, and uses the rotary cutter to cut a printed roll of recording paper into individual pages and discharge the paper, the rotation of the rotary cutter A rotary cutter position detection means (20) consisting of a cam (22) attached to a blade shaft (21) and a switch (23) operated by the cam (22) is provided, and the rotary cutter position detection means (20) ) jam prevention method that immediately stops the printer's drive system if the information from the printer does not return to normal.