How does Tom Robinson get put in jail in Harper Lee's To Kill a Mockingbird?

Tom Robinson is sent to jail twice in Harper Lee's To Kill a Mockingbird.

During Sheriff Heck Tate's testimony at Tom Robinson's trial, we learn that Sheriff Tate arrested Robinson on the evening of November 21st, 1935, when Bob Ewell came to him and reported that Robinson had sexually assaulted Ewell's daughter, Mayella Ewell. Sheriff Tate reports that after going to the Ewells' home and verifying Mayella had indeed been attacked, he went straight to Robinson's house, brought him over to the Ewells', and after Mayella "identified him as the one," Sheriff Tate "took him in" (Ch. 17).

After his arrest, Robinson was held in the state prison while he waited to stand trial, because the state prison is a much more secure facility than Maycomb's county jail. Robinson was also held in prison for a number of months because Atticus had petitioned Judge Taylor to postpone the trial in order to increase the chances of getting a less partial jury. However, Robinson was transferred from the state prison to Maycomb's county jail on Saturday, two days before he stood trial on Monday, and Atticus had to defend him against a lynch mob.

After the jury finds Robinson guilty, Robinson is again arrested and sent back to the state prison, where he is soon shot to death while trying to escape.