Here are the two gadgets that I found and am using on my Juki TL2010i that really help me get the 1/4 inch seam allowance. The first is a 1/4" foot with a guide. It is on ebay for $12.95, ebay item number 271381455391, the title is "High Shank 1/4" Quilting Seam Foot with Guide for Janome 1600P Series 767820105". I emailed them first and asked if it would fit the new Juki and they said yes, and indeed it does and works great. If you google the model number 767820105 you will find several online shops that sell it too. I think the Juki 2010 and the Janome 1600 are similar machines. I wish Juki sold more accessories for home quilters, but I think most of their business is industrial uses.
In addition to that, I take the 'belt and suspenders' approach and ALSO use the Juki single needle T-guage #25878 that I bought directly from
www.sharpsewing.com. It was about $18 if I recall. You screw it onto the bottom plate of your Juki, and then but the T-bar up against the guide bar on the presser foot, and together this gives you 3 to 4 inches of a 'wall' to run the edges of your fabric against to keep them straight and with a perfect 1/4 inch seam allowance.
Hope these help you like they did me---made all the difference!