JPH06191678A - Sheet jam detecting device and recording device employing the device - Google Patents

Abstract

PURPOSE:To detect sheets jamming in an automatic cutter by forming a hinge mechanism out of one side of a sheet guide at this side of the automatic cutter. CONSTITUTION:Sheet guides are provided for the upper and lower sides of the sheet inlet port of an automatic cutter 3, the upper sheet guide 5 out of them is so constituted that it can be structurally rotated by means of a hinge pin 6. In normal operations where no sheet jamming takes place, the upper sheet guide 5 holds a gap interspaced with the fixed lower sheet guide 4 by means of a prestressed spring 7 where a rolled sheet 1 can pass through the gap. A part of the upper sheet guide 5 is formed into a flag shape 5a, and it shields a light transmitting type sensor at all times. Once sheet jamming takes place, a sheet is crushed into an accordion shape, so that the upper sheet guide 5 is thereby pushed up against the spring force of the spring 7. This constitution thereby allows the upper sheet guide 5 which has kept shielding, to be rotated counterclockwise so as to allow shielding by the light transmitting type sensor to be released, so that the resultant is revealed to be caused by sheet jamming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper jam detecting device for an auto cutter and a recording device such as a heat sensitive device using the paper jam detecting device.

[0002]

2. Description of the Related Art As shown in the structural principle of a paper jam detecting device of a conventional thermal recording apparatus shown in FIG. 3, a paper detecting sensor is provided on the paper exit side of an auto cutter as a method for detecting a paper jam. When paper was not detected even though it was being sent at a constant speed, it was recognized as a paper jam.

[0003]

However, in the conventional paper jam detection method, when the printed paper is fully cut, it is determined whether or not the next paper cue is detected by the paper detection sensor.
Although it is possible to detect the presence or absence of paper jams, if the roll paper is partially cut by the auto cutter as shown in Fig. 4, the roll paper is not always completely cut and is conveyed continuously, so the paper detection sensor Detects the presence of paper,
Even if a paper jam occurs at the entrance of the auto cutter, there is a problem that it cannot be detected as a paper jam.

Therefore, an object of the present invention is, in order to solve such a conventional problem, an apparatus capable of detecting a paper jam regardless of whether it is a full cut or a partial cut by directly detecting a portion where a paper jam has occurred. I'm going to get it.

[0005]

In order to solve the above-mentioned problems, the present invention provides a thermal recording apparatus having an auto-cutter with a mechanism for detecting a paper jam at the step before cutting by the auto-cutter. Enabled to detect paper jams early.

[0006]

In the thermal recording apparatus constructed as described above, when the paper is jammed in the auto cutter, the paper conveyance does not stop unless the jam is notified, so the paper is accorded as shown in FIG. Create a shape like this. Therefore, the force to open the conveyance guide acts, and the movable paper guide is moved. The movement is detected by the sensor and used as a paper jam signal to stop the conveyance.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the roll paper 1 is sent to the auto cutter 3 by the carrying roller 2 by the action of a driving device (not shown). The lower paper guide 4 at the entrance of the roll paper 1 of the auto cutter 3 is fixed, and the upper paper guide 5 has a mechanism capable of rotating around a hinge 6. Normally, a spring 7 applies a clockwise pressing force. As shown in FIG. 1, the lower paper guide 4 and the upper paper guide 5 maintain a proper gap for the roll paper 1 to directly pass therethrough.

The upper paper guide 5 is provided with a flag shape like 5a at one end, and in a normal state, that is, when a paper jam does not occur, the flag shape 5a is associated with the light transmission type sensor 8. And cut it off, but the auto cutter 3
When a paper jam occurs inside the paper, the paper becomes wavy as shown in FIG. 2 unless the conveyance of the paper is stopped. Corrugated paper,
An attempt is made to spread the lower paper guide 4 and the upper paper guide 5 with a paper strainer, but since the lower paper guide 4 is fixed, all the force is directed to the upper paper guide 5. Since the upper paper guide 5 is rotatable by the hinge 6, it rotates counterclockwise and rises upward against the spring force of the spring 7. As a result, the upper paper guide flag shape 5a that shuts off the light-transmitting sensor 8 opens the light reception of the sensor 8, so that it is detected that the upper paper guide 5 has moved. In other words, the upper paper guide 5 normally functions as a paper guide, and when a paper jam occurs, it moves like a jammed paper and detects the paper jam by interlocking with the light transmission type sensor 8.

As another embodiment, a transmission type optical sensor 8
Even if a reflection type optical sensor is used instead of the above, the function and effect do not change. Also, there is an embodiment in which the micromechanical switch 10 is used instead of the optical sensor as shown in FIG. 5, and the lower paper guide 4 and the upper paper guide 5 usually have the same relationship as in the first embodiment of FIG. The tip of the guide 5 is the micro switch 1
It is in contact with the 0 terminal 10a and is positioned. Although not shown, when a paper jam occurs in the auto cutter unit 3, the upper paper guide 5 is lifted by the roll paper 1 counterclockwise around the hinge 6, and the tip of the upper paper guide 5 moves the micro switch terminal 10a upward in the clockwise direction. Then, the mechanism inside the micro switch 10 is turned on to detect a paper jam. In this embodiment, instead of the spring 7, a spring with a built-in micromechanical switch 10 is also used. Further, instead of using the hinge system for the entire upper paper guide, a part 5b of the upper paper guide 5 has a hinge structure as shown in FIG.
Structures that act on a are also feasible.

[0010]

As described above, the present invention has an effect that the paper jam of the roll paper is detected, so that the conveyance is temporarily stopped and the damage of the print data and the like can be prevented.

[Brief description of drawings]

FIG. 1 is a structural principle view of a paper jam detection device using a light transmission type sensor of a thermal recording device of the present invention.

FIG. 2 is a principle view of a paper jam state of the paper jam detection device of the thermal recording apparatus of the present invention.

FIG. 3 is a structural principle diagram of a paper jam detection device of a conventional thermal recording device.

FIG. 4 is a partial cut state diagram of roll paper.

FIG. 5 is a partial principle diagram of an embodiment using a micro switch.

FIG. 6 is a partial principle view of the embodiment and a hinge structure for a part of the upper paper guide.

[Explanation of symbols]

 1 Roll Paper 2 Conveyor Roller 3 Auto Cutter 4 Lower Paper Guide 5 Upper Paper Guide 5a Flag Shape 6 Hinge Pin 7 Spring 8 Light Transmissive Sensor 9 Paper Detection Sensor 10 Micro Mechanical Switch

Claims (3)

[Claims] 1. A paper comprising a recording paper conveyance guide including a lower paper guide and an upper paper guide, which is provided on the entrance side of a recording paper autocutter, and a paper jam detecting element for detecting the movement of the upper paper guide. In the jam detection device, the lower paper guide is attached to the entrance of the auto cutter with the base end fixed to the feeding side, and the upper paper guide is mounted with the front end to the feeding side. The end is rotatably attached and is always urged downward.When the conveyance is abnormal, the upper paper guide is moved by the upward force due to the paper jam of the recording paper conveyed to the conveyance path of the auto cutter. A paper jam detection device characterized by opening upward against the force applied thereto. 2. The paper jam detecting device according to claim 1, wherein the recording paper is roll paper. 3. A recording device with an auto cutter, comprising the paper jam detecting device according to claim 1 or 2.