Paper warping detection device

Patent metadata

Field	Value
Publication number	US-2020400618-A1
Application number	US-201916559663-A
Country	US
Kind code	A1
Filing date	Sep 4, 2019
Priority date	Jun 19, 2019
Publication date	Dec 24, 2020
Grant date	—

Abstract

A paper warping detection device comprises: an input tray for loading a plurality of pieces of paper to be fed; a processor for storing a first threshold; a first emitting unit disposed at a front end of the input tray that forms a first angle with the input tray, and then emits a first ultrasonic beam toward the input tray in an obliquely and downward direction; a first receiving unit which is disposed at the front end of the input tray and formed a second angle with the input tray for receiving the ultrasonic beam reflected by the paper loaded in the input tray in a direction leaned downward; and a first analog to digital converter which is electrically connected to the first receiving unit and the processor respectively, for converting the reflected first ultrasonic beam received by the first receiving unit into a first digital signals and outputting the first digital signals to the processor.

First claim

What is claimed is:

1 . A paper warping detection device comprising:
an input tray for loading a plurality of pieces of paper to be fed; a processor for storing a first threshold; a first emitting unit disposed at a front end of the input tray that forms a first angle with the input tray, and then emits a first ultrasonic beam toward the input tray in an obliquely and downward direction; a first receiving unit which is disposed at the front end of the input tray and formed a second angle with the input tray for receiving the ultrasonic beam reflected by the paper loaded in the input tray in a direction leaned downward; and a first analog to digital converter which is electrically connected to the first receiving unit and the processor respectively, for converting the reflected first ultrasonic beam received by the first receiving unit into a first digital signals and outputting the first digital signals to the processor; wherein, the first angle is greater than the second angle, and the processor reads the first digital signals outputted by the first analog to digital converter and compares with the first threshold.

2 . The paper warping detection device as claimed in claim 1 , further comprising:
a second emitting unit disposed to one side of the input tray, the second emitting unit electrically connected with the processor for being controlled to switch on and off; a second receiving unit disposed to the other side of the input tray to face the second emitting unit for receiving the ultrasonic beam emitted by the second emitting unit; a second analog to digital converter electrically connected with the second receiving unit and the processor for converting the second ultrasonic beam received by the second receiving unit into a second digital signals and outputting the second digital signals to the processor, and the processor comparing the second digital signals with a second threshold stored in the processor; wherein, the second emitting unit comprises a transmitter and a first reflective wall which is configured as a spherical reflective wall, and aligns its concave side to the second receiving unit; and the transmitter is disposed to face the concave surface of the first reflective wall for collectively reflecting the projected second ultrasonic beam via the first reflective wall.

3 . The paper warping detection device as claimed in claim 2 , wherein the projection angle of the second emitting unit is set to less than 10 degrees.

4 . The paper warping detection device as claimed in claim 2 , wherein the first reflective wall is composed of a first curved wall and a second curved wall connected to the first curved wall, the first curved wall and the second curved wall both are a simple spherical reflecting wall and arranged to align the concave side to the second receiving unit; wherein the transmitter is disposed on the connection line of the focal point of the first curved wall and the focal point of the second curved wall, the first curved wall is disposed at the front side of the transmitter, and makes the center of curvature of the first curved wall disposed at the rear side of the transmitter; and the second curved wall is disposed at the rear side of the transmitter, and makes the center of curvature of the second curved wall disposed at the front side of the transmitter.

5 . The paper warping detection device as claimed in claim 2 , wherein the second receiving unit is composed of a receiver and a second curved wall, wherein the second curved wall is a spherical reflecting wall arranged to align the concave side to the first reflective wall, and the receiver is disposed at the concave surface of the second curved wall for collectively reflecting the second ultrasonic beam to the receiver via the second curved wall.

6 . The paper warping detection device as claimed in claim 1 , wherein the first receiving unit is arranged lower than the first emitting unit.

7 . The paper warping detection device as claimed in claim 1 , wherein the projection angle of the first ultrasonic beam of the first emitting unit is 94 degrees.

8 . The paper warping detection device as claimed in claim 1 , wherein the first angle is greater than 40 degrees and less than 60 degrees.

9 . The paper warping detection device as claimed in claim 1 , wherein the second angle is greater than 25 degrees and less than 45 degrees.

Assignees

• Foxlink Image Tech Co Ltd

Inventors

• Wu Ming Da
• Huang Shih Sen
• Wu Chang Yuan

Classifications

• B65H7/06

  responsive to presence of faulty articles or incorrect separation or feed (B65H7/14 takes precedence) · CPC title

• B65H2553/30

  using acoustic or ultrasonic elements · CPC title

• B65H2511/521

  Presence of foreign object or undesirable material, i.e. material of another nature than the handled material · CPC title

• B65H1/04

  adapted to support articles substantially horizontally, e.g. for separation from top of pile · CPC title

• G01N2291/044

  Internal reflections (echoes), e.g. on walls or defects · CPC title