Press type automatic screwdriver

A press type automatic screwdriver comprising:

• a press member;
• a drive link;
• a screwdriver bit;
• and
• a screw thread pair, the screw thread pair comprising a screw rack and a gear engaged with the screw rack;
• wherein the press member and the screwdriver bit are secured to opposite ends of the drive link, the press member and the drive link are connected by the screw thread pair, the screw rack is resisted by the press member, the gear is secured on an end of the drive link;
• and
• wherein when the press member is pressed, the press member pushes the screw rack, the screw rack drives the gear to rotate, the gear drives the drive link to rotate, and the drive link drives the screwdriver bit to rotate;
• wherein the screw rack comprises a first rotating screw rack and a second rotating screw rack, the first rotating screw rack and the second rotating screw rack are juxtaposed, the gear is engaged with the first rotating screw rack or the second rotating screw rack;
• wherein the press type automatic screwdriver further comprises two switchover members, one of the two switchover members is aligned with the first rotating screw rack, and the other one of the two switchover members is aligned with the second rotating screw rack, when the one of the two switchover members aligned with the first rotating screw rack is pushed, the other one of the two switchover members pushes the screw rack to move to make the second rotating screw rack engage with the gear, and to make the first rotating screw rack away from the gear;
• when the other one of the two switchover members aligned with the second rotating screw rack is pushed, the one of the two switchover members pushes the screw rack to move to make the first rotating screw rack engage with the gear, and to make the second rotating screw rack away from the gear.