Rapid S17 stapler

Question edited for clarity and typos.

Either mains voltage instability, or the internal switch has gotten a 'hair trigger'. Clean and lubricate.

https://www.google.com/search?q=rapid+5080+electric+stapler+troubleshooting

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Usually the plate will swivel 180 degrees to give an open staple for easy removal, or a closed staple for permanent fastening.

Push up from underneath and turn it.

https://www.google.com/search?q=Swingline+heavy+duty+stapler+manual

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The Rapid Isaberg 16 stapler uses 26/6 size staples. These staples are also commonly referred to as "standard staples" and are widely available at most office supply stores or online retailers. They measure approximately 6mm wide and 11mm in length, and are compatible with a wide range of staplers, including the Rapid Isaberg 16. Be sure to use high-quality staples to ensure that your stapler functions properly and staples securely.

This type of stapler is not supposed to close the staples. The legs remain straight after exiting the stapler.

If you are a teacher, get a pair of scissors to get the staples out

1. Make sure you have the correct staples for the machine, Swingline Hvy-Duty Staples for 90010 Stapler, 0.625-Inch Leg Length, 2500 per Box (90009)

2. Check the staples to make sure there are no visible jams. Remove some staples from the row if this helps them fit.

3. If you continue to have problems, contact the manufacturer at http://www.acco.com/swingline/, or
Repair Service/Technical Support:
Phone: 800.790.7787

They will replace the stapler if needed.

Hi Eliz231.
go to this link it might help you get it sorted.
Stanley Bostitch 00540 00540 AntiJam Extra Heavy Duty Stapler Stapler wont...

Hi Sharon. It is absolutely essential that you get the staples designed for this stapler. These are Powershot 5700 staples.

please mark this answer as a fixya! thanks.