Printer paper-out detection device

Abstract

The invention discloses a paper-out detecting device of a printer, which comprises an infrared detecting lamp and an alarm circuit, wherein the infrared detecting lamp comprises an emitting lamp and a receiving lamp which are diagonally arranged in an accommodating cavity of a printer body respectively; paper of a paper coil entering a printing head is positioned between the emitting lamp and the receiving lamp; infrared ray emitted from the emitting lamp to the receiving lamp is blocked; and the receiving lamp is also connected with the alarm circuit and communicated with the alarm circuit when receiving signals of the emitting lamp. The device can accurately detect the paper-out state of the paper coil stuck on a bottom cylinder with glue and the paper coil stuck on the bottom cylinder without glue, and has the advantages of high working reliability and convenient use.

Description

technical field [0001] The invention relates to printing equipment, in particular to a detection device capable of detecting whether the printer is out of paper. Background technique [0002] Commonly used printers can refer to figure 1 As shown, an accommodating cavity 10 is provided in the fuselage, and a blank paper roll 20 is stuck in the accommodating cavity 10. When the printer is working, the paper is pulled upward to drive the paper roll 20 to rotate, and at the same time, the paper roll 20 is driven to rotate by the paper outlet 30. paper out. [0003] At present, there are two types of paper rolls for printers on the market: one is that the end of the paper is glued to the bottom tube (ie the paper core), and the other is that the end of the paper is not glued to the bottom tube. For the first type of paper roll 20 , when the paper is almost used up, because the tail of the paper is glued to the bottom cylinder, the bottom cylinder is driven to be pulled to the p...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two types of paper rolls for printers on the market: one is that the end of the paper is glued to the bottom tube (ie the paper core), and the other is that the end of the paper is not glued to the bottom tube. For the first type of paper roll 20 , when the paper is almost used up, because the tail of the paper is glued to the bottom cylinder, the bottom cylinder is driven to be pulled to the paper outlet 30, the paper will be stuck, the paper will stop advancing, and the printer is still working at this time. When the staff finds out, the last line of the paper has often been printed repeatedly, and it is easy to cause wear and tear on the print head and gears, shortening the service life of the printer

[0004] For the second type of paper roll 20, a gravity switch (not shown) is generally provided with the bottom of the printer accommodating cavity 10, and the gravity switch is connected with an alarm circuit. The upward traction force of the printer when pulling the paper to print, falls to the bottom of the accommodating chamber 10 under the action of gravity, touches the gravity switch, thereby turns on the alarm circuit, reminds the operator that the paper is used up at this moment, and installs the paper roll as soon as possible 20; however, this structure is only applicable to paper rolls 20 with no glue attached to the bottom cylinder, and the first type of paper roll 20 cannot be reminded of paper shortage, so its application range is greatly limited, and it is not universal

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