JPH11130309A - Paper jam detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly detect generation of paper jam by mounting a paper jam detector by a user himself/herself by performing controls to stop a record writing operation and to start an alarm means by the detected output of the paper jam detector. SOLUTION: A detector 10 is mounted so as to hold a rib formed on the inside face of an upper case main body 3 facing a carrier route of long size paper S or a part of a paper guide plate by holding pieces 11, 12. The tip of a sensing piece 21 of a preliminarily extended and formed limit switch 20 is located at an area where long size paper S is bent when paper jam is generated. Under this state, a printer main body 1 writes record data of an automobile on long size paper S from a terminal equipment 2. When bending is generated in the long size paper S in the area where the sensing piece 21 is located because resistance caused by some factors is applied to the long size paper S, the sensing piece 21 displaced by paper pressure of long size paper S closes the contact of the limit switch 20, a paper jam detection signal is outputted to a control part, a record writing operation is immediately stopped, a display lamp is turned on and generation of paper jam is notified to a worker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an apparatus for detecting a jam of a long sheet generated inside a printer body.

[0002]

2. Description of the Related Art An impact dot printer which handles long paper such as fanfold paper having perforations on both sides is often used for recording and writing in an unmanned state. In such a case, it is necessary to re-record the data before the occurrence of the jam, and in parallel with assembling the car as planned for the production, these data are recorded one by one. There is a problem that writing on long paper, especially in a production site, greatly hinders the operation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
An object of the present invention is to provide a new sheet clogging detection device which can detect a paper jam as soon as possible by attaching it to an appropriate portion where a paper jam is likely to occur, stop recording and writing, and notify this kind of situation as soon as possible.

[0004]

That is, according to the present invention, as a sheet clogging detection device for achieving the above object, a paper clip is formed so as to be attached to a member facing a conveying path of long paper. A paper jam detector provided with a sensing piece that is displaced due to the bending of long paper caused by paper jam is attached to a part of the holding member, and the detection output of the detector stops the recording / writing operation and starts the alarm means. Control means for controlling the operation is performed.

[0005]

Embodiments of the present invention will be described below. The drawings all show one embodiment of the present invention.

In the drawing, reference numeral 1 denotes an impact dot type printer main body to which the present invention is applied. In this embodiment, as shown in FIG. Based on the record data of each car assembled by the production plan downloaded from the host computer via the host computer, and the data on the body numbers of these cars, the data of one car is converted into long paper such as fanfold paper. It is configured to strike on S.

Reference numeral 10 in the figure denotes a printer main body 1 of this kind.
Is a detection device which is attached to an appropriate position of a long paper carry-out path and detects the occurrence of paper jam at an early stage. This device 10 comprises a long paper S which falls from a push tractor 2 to a recording / writing unit or a paper discharge unit (not shown). And a rib 4 protruding from the inner surface of the upper case main body 3 facing the transfer path of the upper case 3 and a plate member (not shown) provided to form a paper guide.

That is, the detecting device 10 is connected to the pivoting portions 15 and 16 formed by bending the central portions on both sides of the two holding pieces 11 and 12 through the shafts 17 respectively. It is formed into a paper-shear shape by applying a biasing force in a direction of pressing against both of the holding portions 11a and 12a by the wound spring 18, and furthermore, holding one of the holding portions 13 and 14 extending from these holding pieces. The portion 14 is extended, and a limit switch 20 for detecting a paper jam is provided on an outer surface thereof.

As shown in FIG. 1, the sensing piece 21 from the limit switch 20 is extended toward the conveyance path of the long paper S, and the "<" The folded end portion is configured to be displaced by the paper pressure of the long paper S that has been bent due to the resistance due to the paper jam to close the contact point of the limit switch 20. Is output to a terminal computer 6 or a control circuit provided in the printer main body 1 to stop recording and writing, and to notify an abnormality by a buzzer or an indicator lamp 8.

In the drawings, reference numerals 11b and 12b denote holding pieces 1.
1 shows a plate material such as rubber having appropriate elasticity and a large friction coefficient adhered to each of the opposing surfaces 1 and 12.

In the embodiment constructed as described above, the rib 7 formed on the inner surface of the upper case body 3 facing the conveyance path of the long paper S or a part of the paper guide plate is now held by the holding piece 1.
When the detection device 10 is mounted so as to be sandwiched between the detection switches 1 and 12, the detection piece 2 of the limit switch 20 which is formed in advance is formed.
Reference numeral 1 indicates that the leading end is located in a region where the long sheet S bends when a paper jam occurs.

In this state, the printer body 1
Writes the record data of the automobile from the terminal 2 on the long paper S, but the resistance is applied to the long paper S for some reason, and the long paper S in the area where the sensing piece 21 is located is bent. When this occurs, the sensing piece 21 displaced by the paper pressure of the long paper S
Closes the contact of the limit switch 20, outputs a paper jam detection signal to the control unit to immediately stop the recording / writing operation, and simultaneously turns on the display lamp 8 to notify the operator of the occurrence of paper jam. .

[0013]

As described above, according to the present invention, the paper is displaced by the bending of the long paper which occurs at the time of the paper jam, to the paper-jaw-like holding member attached to the member of the control member facing the conveyance path of the long paper. Since the detector equipped with the sensing piece is provided, based on the position of paper jam occurrence that differs depending on the individual printer or the paper quality, and the empirically obtained position of bending of long paper at the time of paper jam, By installing the paper jam detector by the user himself, the occurrence of paper jam can be quickly detected.

In addition, the recording and writing operation is stopped or the warning means is started by the detection output of the detector, so that the long paper of this type of printer which is frequently operated unattended when a paper jam occurs. Waste and time wasted due to re-writing of records can be minimized.

[Brief description of the drawings]

FIG. 1 is a side view of a paper jam detecting device according to an embodiment of the present invention in a state where the paper jam detecting device is attached to a part of a printer.

FIG. 2 is a perspective view of the same device.

FIG. 3 is a diagram showing an example of a terminal device such as a printer equipped with the above device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer main body 2 Push tractor 3 Case main body 4 Rib 10 Detecting device 11, 12 Nipping piece 20 Detector 21 Sensing piece S Long paper

Claims (1)

[Claims] 1. A sensor piece which is displaced by a deflection of the long paper which occurs at the time of paper jam, in a part of a holding member formed in a paper pin shape so as to be attached to a member facing a conveyance path of the long paper. A sheet jam detecting device, comprising a paper jam detector, and control means for controlling a stop of a recording / writing operation and a start of an alarm means based on a detection output of the paper jam detector.