AU2020100364A4 - Paper jam detection device for printers - Google Patents

Abstract

A paper jam detection device for a printer is disclosed. Reflectors are inlaid in a primary folding roller of a folding machine, optoelectronic switches are mounted on brackets, and detection rays from the optoelectronic switches are perpendicular to the reflectors. A metal sensor disk is mounted on a horizontal perforating roller of the folding machine, a proximity switch is mounted on a bracket, and the metal sensor disk corresponds to the proximity switch in position. The optoelectronic switches are reflective optoelectronic switches and include octavo optoelectronic switches and thirty-twomo optoelectronic switches. The reflectors include two octavo reflectors and two thirty-twomo reflectors. The optoelectronic switches and the proximity switch are connected to a programmable controller. In the case of an octavo paper jam or a thirty-twomo paper jam, a jam fault can be rapidly detected, the machine is controlled by a program to stop immediately, and a paper tape is cut off. The reliability of the equipment is enhanced, damage to the equipment is reduced, the service life of the machine is prolonged, and paper jam detection and fault recognition are realized under high-speed dynamic conditions.

Description

PAPER JAM DETECTION DEVICE FOR PRINTERS

2020100364 11 Mar 2020

BACKGROUND OF THE INVENTION [0001 ] 1. Technical Field [0002] The invention relates to a printer, in particular to a paper jam detection device for a printer.

[0003] 2. Description of Related Art [0004] Folding machines for web presses have to be adjusted in many links because of their complicated structure, and once the folding machines fail to adjust to the correct place, paper jams may occur. On account of the high printing speed of web presses (the maximum printing speed of most web presses is up to 36,000 sheets per hour), damage to equipment will probably be caused in the case of a paper jam, which in turn affects the normal production of enterprises and can cause severe losses to the enterprises. In view of this, it is necessary to detect a paper jam instantly when it happens to the folding machine and then immediately stop the machine.

[0005] Folding machines in the prior art can discharge octavo sheets, sixteenmo sheets, and thirty-twomo sheets, and paper jams may be caused if the sheets fail to be smoothly discharged in any link. Because existing folding machines only have a sixteenmo paper jam detection function, and do not have an octavo paper jam detection function or a thirty-twomo paper detection function, once an octavo paper jam or a thirty-twomo paper jam has occurred, the machines have to be manually stopped in time, which may otherwise result in damage to the equipment.

[0006] A mechanically-triggered micro-switch is used as a detection element for fulfilling the sixteenmo paper jam detection function to detect the thickness of dynamic planar sheets. The sheets should be continuously and stably discharged one by one under normal conditions. However, once the sheets are scrambled for certain unexpected reasons,

2020100364 11 Mar 2020 these sheets will pile up and get stuck, and when the sheets pile up to a certain thickness, a micro-switch will be triggered, and this phenomenon is referred to as paper jam. In the case of a paper jam, the machine will be automatically controlled by a program to stop.

[0007] Because of the difference in mechanical structure, the method for detecting sixteenmo paper jams is not applicable to the detection of jams and disorder of octavo paper or thirty-twomo paper. Due to the lack of a method for detecting octavo paper jams or thirty-twomo paper jams at present, the machine has to be manually stopped in time when an octavo paper jam or a thirty-twomo paper jam has occurred, which may otherwise cause damage to the equipment.

BRIEF SUMMARY OF THE INVENTION [0008] The objective of the utility model is to provide a paper jam detection device for a printer.

[0009] The objective of the invention is realized through the following technical solution:

[0010] According to the paper jam detection device for a printer, reflectors are inlaid in a primary folding roller of a folding machine, optoelectronic switches are mounted on brackets, and detection rays from the optoelectronic switches are perpendicular to the reflectors; and [0011] A metal sensor disk is mounted on a horizontal perforating roller of the folding machine, a proximity switch is mounted on a bracket, and the metal sensor disk corresponds to the proximity switch in position.

[0012] As can be seen from the above technical solution provided by the invention, the paper jam detection device for a printer can rapidly detect a jam fault in the case of a paper jam, the machine is controlled by a program to stop immediately, and a paper tape is cut off. Also, paper jam detection and fault recognition are realized under high-speed dynamic conditions.

2020100364 11 Mar 2020

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS [0013] FIG. 1 is a structural diagram of a horizontal perforating roller in an embodiment of the invention.

[0014] FIG. 2 is a structural diagram of a primary folding roller in the embodiment of the invention.

[0015] FIG. 3 is an electrical schematic diagram of the embodiment of the invention.

[0016] Reference Signs:

[0017] 1) octavo optoelectronic switch; 2) octavo optoelectronic switch mounting bracket; 3) octavo reflector; 4) primary folding roller; 5) sheet; 6) proximity switch; 7) proximity switch mounting bracket; 8) metal sensor disk; 9) horizontal perforating roller; 10) mounting wallboard; 11) thirty-twomo optoelectronic switch; 12) thirty-twomo optoelectronic switch mounting bracket; 13) thirty-twomo reflector; 14) programmable controller.

DETAILED DESCRIPTION OF THE INVENTION [0018] The embodiments of the invention are further expounded below. Contents that are not detailed in the embodiments of the invention belong to the prior art known by those skilled in this field.

[0019] A preferred specific implementation of a paper jam detection device for a printer of the invention is as follows:

[0020] Reflectors are inlaid in a primary folding roller of a folding machine, optoelectronic switches are mounted on brackets, and detection rays from the optoelectronic switches are perpendicular to the reflectors; and

2020100364 11 Mar 2020 [0021] A metal sensor disk is mounted on a horizontal perforating roller of the folding machine, a proximity switch is mounted on a bracket, and the metal sensor disk corresponds to the proximity switch in position.

[0022] The optoelectronic switches are reflective optoelectronic switches and include octavo optoelectronic switches and thirty-twomo optoelectronic switches, and the reflectors include two octavo reflectors and two thirty-twomo reflectors.

[0023] The optoelectronic switches and the proximity switch are connected to a programmable controller.

[0024] According to the paper jam detection device for a printer of the invention, a jam fault can be rapidly detected in the case of an octavo paper jam or a thirty-twomo paper jam, and the folding machine is controlled by a program to stop immediately, and a paper tape is cut off.

[0025] Specific Embodiment:

[0026] Because printing rollers are mechanical parts rotating at a high speed (the maximum speed of the printing rollers is 600RPM), the difficulty lies in how to detect and judge sheets which dynamically rotate at a high speed.

[0027] The following measure is taken by the invention:

[0028] The mechanical design structure is improved in the following two aspects: first, as shown in FIG. 2, reflectors are inlaid in a primary folding roller of a folding machine, and optoelectronic switches are mounted on brackets in such a manner that the optoelectronic switches can perpendicularly irradiate the reflectors when the primary folding roller rotates at high speed;

[0029] Second, as shown in FIG. 1, a metal sensor disk is mounted on a horizontal perforating roller of the folding machine, and a proximity switch is mounted on a bracket, wherein the metal sensor disk can sense signals when approaching the proximity switch.

[0030] An electrical program can be written to determine whether or not sequential

2020100364 11 Mar 2020 coordination between the optoelectronic switches and the proximity switch is correct. Once it is found that the sequential coordination between the optoelectronic switches and the proximity switch is incorrect, it is considered that a paper jam is detected, the folding machine is automatically stopped, and an alarm is given.

[0031] Proximity switch:

[0032] As shown in FIG. 1, the proximity switch is used for detecting the metal sensor disk mounted on the horizontal perforating roller, and the proximity switch senses the metal sensor disk every time the horizontal perforating roller takes a turn.

[0033] Because the horizontal perforating roller is a haploid-diameter roller (that is, the perimeter of each roller is equal to the length of one sheet), the proximity switch will be triggered every time one sheet passes through the horizontal perforating roller.

[0034] Octavo paper jam detection optoelectronic switches:

[0035] As shown in FIG. 2, the octavo paper jam detection optoelectronic switches are used for detecting reflectors inlaid in the primary folding roller and are reflective optoelectronic switches, wherein the reflectors are inlaid in the primary folding rollers.

[0036] Because the primary folding roller is a diploid-diameter roller (that is, the perimeter of each roller is equal to the length of two sheets), two reflectors are mounted on the circumference of the primary folding roller.

[0037] During normal printing, the optoelectronic switches should always be able to irradiate the reflectors, and the reflectors will not be shielded by sheets.

[0038] Once the sheets are scrambled, the reflectors will be shielded by the sheets, and the optoelectronic switches cannot irradiate the reflectors any more.

[0039] Octavo paper jam detection abnormality: if a signal from the proximity switch is received while no signal from the optoelectronic switches is received, it is considered that a potential fault has appeared. If signals from the proximity switch are received three times in succession while no signal from the optoelectronic switches is

2020100364 11 Mar 2020 received, it is considered that a paper jam has occurred, and the folding machine will be automatically stopped.

[0040] As shown in FIG. 2, thirty-twomo paper jam detection optoelectronic switches:

[0041] The thirty-twomo paper jam detection optoelectronic switches are used for detecting reflectors inlaid in the primary folding roller and are reflective optoelectronic switches, wherein the reflectors are inlaid in the primary folding roller. Because the primary folding roller is a diploid-diameter roller (that is, the perimeter of each roller is equal to the length of two sheets), two reflectors are mounted on the circumference of the primary folding roller.

[0042] During normal printing, the reflectors will always be shielded by sheets, and the optoelectronic switches cannot irradiate the reflectors.

[0043] Once the sheets are scrambled, the reflectors will be not shielded by the sheets anymore, and the optoelectronic switches will directly irradiate the reflectors.

[0044] Thirty-twomo paper jam detection abnormality: if a signal from the proximity switch is received and a signal from one optoelectronic switch is also received, it is considered that a potential fault has appeared. If an exception occurs three times in succession, it is considered that a paper jam has occurred, and the folding machine will be automatically stopped.

[0045] The electrical schematic diagram is shown in FIG. 3:

[0046] Programming language: ST instruction list [0047] Software environment: GX Developer [0048] Hardware environment: Mitsubishi PLC (FX3UC).

[0049] By the adoption of the paper jam detection device for a printer of the invention, the folding machine can be stopped in time when an octavo paper jam or a thirty-twomo paper jam happens during high-speed rotation. The reliability of the

2020100364 11 Mar 2020 equipment is enhanced, damage to the equipment is reduced, and the service life of the machine is prolonged. Paper jam detection and fault recognition are realized under high-speed dynamic conditions, and the paper jam detection device is ingenious in structure and high in practicability.

[0050] The above embodiments are only preferred ones of the invention, and are not intended to limit the protection scope of the invention. All transformations or substitutions easily achievable for any personnel skilled in this technical field should also fall within the protection scope of the invention. Thus, the protection scope of the invention should be subject to the protection scope of the claims.

Claims (3)

1. What is claimed is:

   2020100364 11 Mar 2020

   1. A paper jam detection device for a printer, characterized in that reflectors are inlaid in a primary folding roller of a folding machine, optoelectronic switches are mounted on brackets, and detection rays from the optoelectronic switches are perpendicular to the reflectors, and a metal sensor disk is mounted on a horizontal perforating roller of the folding machine, a proximity switch is mounted on a bracket, and the metal sensor disk corresponds to the proximity switch in position.
2. 2. The paper jam detection device for a printer according to Claim 1, characterized in that the optoelectronic switches are reflective optoelectronic switches and include octavo optoelectronic switches and thirty-twomo optoelectronic switches, and the reflectors include two octavo reflectors and two thirty-twomo reflectors.
3. 3. The paper jam detection device for a printer according to Claim 1 or 2, characterized in that the optoelectronic switches and the proximity switch are connected to a programmable controller.