I have seen in many Ashkenazi synagogues that the person called to the reading of the Torah at Shabbos mincha puts on a tallis.
Typically, he takes this tallis off after the kedusho of the repetition of the Amidah.
I thought he wears the Tallis so as not to embarrass someone who is not dressed well when he goes up to read.
Therefore it would seem he could take it off immediately after the reading. Why is it worn after the Torah reading?
If it is to be worn for the Amidah, why is it not worn until the end in order not to disturb concentration in the repetition of the Amidah?