Paper roll device with a paper roll detecting function

Abstract

A paper roll device includes a casing, two rollers, a lever, a resilient component, a detecting module and a control module. The two rollers are installed inside the casing and for supporting a paper roll cooperatively. An end of the lever is disposed between the two rollers, and the lever pivots around a shaft. The paper roll sinks to contact the end of the lever, so as to push the end of the lever in a first direction. The resilient component is connected to the lever and for supporting the lever in a second direction opposite to the first direction. The detecting module is for detecting a position state of the other end of the lever, so as to generate a corresponding detecting signal. The control module is electrically connected to the detecting module and for determining a using state of the paper roll according to the detecting signal.

What is claimed is: 
     
         1 . A paper roll device, comprising:
 a casing;   two rollers installed inside the casing, the two rollers being for supporting a paper roll cooperatively;   a lever installed inside the casing, an end of the lever being disposed between the two rollers, the lever pivoting around a shaft, the paper roll sinking to contact the end of the lever, so as to push the end of the lever in a first direction;   a resilient component installed inside the casing and connected to the lever, the resilient component being for supporting the lever in a second direction opposite to the first direction;   a detecting module installed inside the casing, the detecting module being for detecting a position state of the other end of the lever, so as to generate a corresponding detecting signal; and   a control module installed inside the casing and electrically connected to the detecting module, the control module being for determining a using state of the paper roll according to the detecting signal generated by the detecting module.   
     
     
         2 . The paper roll device of  claim 1 , wherein the detecting module is a switch unit, as a diameter of the paper roll is less than a predetermined diameter, the paper roll pushes the end of the lever in the first direction, so as to pivot the lever around the shaft and to activate the switch unit by the other end of the lever, so that the control module determines that the using state is a low amount state according to the detecting signal. 
     
     
         3 . The paper roll device of  claim 2 , further comprising a notification module electrically connected to the control module, and the control module being further for controlling the notification module to generate an alert message as the control module determines that the using state is the low amount state. 
     
     
         4 . The paper roll device of  claim 3 , wherein the notification module is a sound module, a light-emitting module or a text message module. 
     
     
         5 . The paper roll device of  claim 1 , further comprising a storage module electrically connected to the control module, the storage module being for storing a set of predetermined detecting values, and the control module being further for comparing the set of predetermined detecting values with the detecting signal to determine the using state of the paper roll. 
     
     
         6 . The paper roll device of  claim 5 , wherein the detecting module comprises a light emitter for emitting a light beam and a light receiver, the light receiver generates the corresponding detecting signal according to a received light quantity of the light beam emitted from the light emitter, and the control module compares the set of predetermined detecting values with the corresponding detecting signal, so as to determine the using state of the paper roll. 
     
     
         7 . The paper roll device of  claim 6 , wherein the light emitter and the light receiver are disposed on two sides of the other end of the lever, the set of predetermined detecting values comprises an alert value, as a diameter of the paper roll is less than a predetermined diameter, the paper roll pushes the end of the lever in the first direction, so that the lever pivots around the shaft, the other end of the lever shades the light beam, the light receiver sends the corresponding detecting signal to the control module, and the control module determines that the using state of the paper roll is a low amount state as the control module determines that the alert value of the set of predetermined detecting values corresponds to the corresponding detecting signal. 
     
     
         8 . The paper roll device of  claim 6 , wherein the light emitter and the light receiver are disposed on the same side of the other end of the lever, the set of predetermined detecting values comprises an alert value, as a diameter of the paper roll is less than a predetermined diameter, the paper roll pushes the end of the lever in the first direction, so that the lever pivots around the shaft, the other end of the lever reflects the light beam to the light receiver, the light receiver sends the corresponding detecting signal to the control module, and the control module determines that the using state of the paper roll is a low amount state as the control module determines that the alert value of the set of predetermined detecting values corresponds to the corresponding detecting signal. 
     
     
         9 . The paper roll device of  claim 1 , further comprising a notification module electrically connected to the control module, and the control module being further for controlling the notification module to generate a corresponding notification message according to the using state. 
     
     
         10 . The paper roll device of  claim 1 , wherein the shaft is disposed between the end of the lever and the resilient component.