Arsenal midfielder Conor Henderson and Wolves left-back Jamie Reckord have both joined on three-month loan deals, while free agent Franck Moussa has been signed on a short term contract.
Robins told the club's official website: "It was always in my mind to do three or four deals to bring in players to give us some added strength.
"Franck can play central or right sided, he's got enough pace, he's tricky and can score so he gives us utility across the midfield.
"Jamie is desperate to play so we're giving him the opportunity to force his way into the first team and he also provides good cover for the left-back spot.
"In Conor we have a very clever, intelligent midfield player with a wand of a left foot. He can play on the right, the left or central, he fits the way we will want to play and he's been brought up in the Arsenal way so I'm looking forward to working with him."