Penalties. - Any person guilty of robbery with the use of violence against or intimidation of any person shall suffer: 1. The penalty of reclusion perpetua to death, when by reason or on occasion of the robbery, the crime of homicide shall have been committed, or when the robbery shall have been accompanied by rape or intentional mutilation or arson. 2. The penalty of reclusion temporal in its medium period to reclusion perpetua, when or if by reason or on occasion of such robbery, any of the physical injuries penalized in subdivision I of Article 263 shall have been inflicted. 3. The penalty of reclusion temporal, when by reason or on occasion of the robbery, any of the physical injuries penalized in subdivision 2 of the article mentioned in the next preceding paragraph, shall have been inflicted. 4. The penalty of prision mayor in its maximum period to reclusion temporal in its medium period, if the violence or intimidation employed in the commission of the robbery shall have been carried to a degree clearly unnecessary for the commission of the crime, or when in the course of its execution, the offender shall have inflicted upon any person not responsible for its commission any of the physical injuries covered by subdivisions 3 and 4 of said Article 263. 5. The penalty of prision correccional in its maximum period to prision mayor in its medium period in other cases.