Liquid transport method and liquid transport apparatus

Abstract

A liquid transport method includes rotating a cam from a reference position of rotation of the cam rotating for transporting liquid; determining whether or not the cam rotates to a predetermined rotational angle on the basis of an image of a liquid transport apparatus captured when the cam is rotated and stopped; and memorizing a signal value indicating a rotational angle of the cam from the reference position of rotation until the cam rotates to the predetermined rotational angle. With this method, the relationship between a signal original point and a pump original point is obtained easily.

What is claimed is: 
     
         1 . A liquid transport method for a liquid transport apparatus comprising:
 rotating a cam from a reference position of rotation of the cam rotating for transporting liquid;   determining whether or not the cam rotates to a predetermined rotational angle on the basis of an image of the liquid transport apparatus captured when the cam is rotated and stopped; and   memorizing a signal value indicating a rotational angle of the cam from the reference position of rotation until the cam rotates to the predetermined rotational angle.   
     
     
         2 . The liquid transport method according to  claim 1 , further comprising detecting a position detection mark provided on the cam from the image to detect the rotational angle of the cam. 
     
     
         3 . The liquid transport method according to  claim 2 , further comprising detecting an edge of the position detection mark to detect the rotational angle of the cam. 
     
     
         4 . The liquid transport method according to  claim 1 , further comprising detecting a position of a pressing member configured to press a member which defines a flow channel of the liquid in association with a rotation of the cam from the image to detect the rotational angle of the cam. 
     
     
         5 . The liquid transport method according to  claim 1 , wherein the rotational angle of the cam when the reversely flowed liquid returns by an amount corresponding to the reverse flow is used as a reference of the predetermined angle. 
     
     
         6 . A liquid transport method for a liquid transport apparatus comprising:
 rotating a cam configured to rotate for transporting liquid;   reading a memorized signal value indicating a rotational angle of the cam rotating from a reference position of rotation to a predetermined rotational angle,   determining whether or not the cam rotates from the reference position to the predetermined rotational angle, and   rotating the cam to a desired rotational angle with reference to a position where the cam is determined to have rotated to the predetermined rotational angle.   
     
     
         7 . The liquid transport method according to  claim 6 , wherein
 with reference to the position where the cam is determined to have rotated to the predetermined rotational angle, the cam is rotated at a predetermined speed until the cam reaches a first rotational angle, and is rotated at a speed higher than the predetermined speed from the first rotational angle to a second rotational angle.   
     
     
         8 . The liquid transport method according to  claim 6 , wherein
 the memorized signal value indicating the rotational angle of the cam from the reference position of rotation until the cam rotates to the predetermined rotational angle is a signal value indicating the rotational angle of the cam from the reference position until the cam rotates to the predetermined rotational angle which is obtained by   rotating the cam from the reference position, and determining whether or not the cam rotates to the predetermined rotational angle on the basis of an image of the liquid transport apparatus captured when the cam is rotated and stopped.   
     
     
         9 . A liquid transport apparatus comprising: a cam configured to rotate for transporting liquid, and
 a control unit configured to   read a memorized signal value indicating a rotational angle of the cam rotating from a reference position of rotation to a predetermined rotational angle,
 determine whether or not the cam rotates from the reference position to the predetermined rotational angle, and 
 rotate the cam to a desired rotational angle with reference to a position where the cam is determined to have rotated to the predetermined rotational angle.