Model 640 manual - Simplicity Fashion Pro SW2145 Mechanical Sewing Machine

question moved to Brother Sewing Machine.

EX for free, VX at a small charge.

Manuals ' EX-660 ' Canada ' Brother

https://support.brother.com > manualtop > prod=hf_ex6...
Manuals · EX-660 · Language · User's Guide · Operation Manual · Quick Reference Guide · Quick Start Guide · Others · Accessories catalog.

Brother VX 640 660 - sewconsult.com

https://sewconsult.com > ... > Brother instruction manuals
Brother VX 640 660. $5.95. Brother VX 640 660 sewing machine instruction and user manual. 38 pages. PDF download. Brother VX 640 660 quantity. Add to cart.

A manual would probably be very helpful:

https://www.sewingpartsonline.com/instruction-book-janome-and-newhome-640.aspx

New Home Sewing Machine Manuals Instruction and Repair Manuals

Although this is not your specific model, its manual may be helpful (threading is usually the same or very similar):

New Home 535 Manual Instruction Page 5

NOTE: be sure to ALWAYS RAISE the presser foot when threading the top thread!

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here is a link for a manual, it should have the information in it
Simplicity SL 630 640 Instruction Manual

there are no free janome/new home manual that I know of, but here is a link for the cheapest one I can find.
http://sewusa.com/Sewing_Machine_Manuals/New_Home_Manuals/New_Home_630_640.htm

here is a link for a manual
http://www.sewusa.com/Sewing_Machine_Manuals/Singer_Manuals/640_Instruction_Manual.htm
or sewusa.com also has some threading diagrams or you can also check with youtube for a video.

here are 2 links for a manual, that should have the information
inside, one is a downloadable pdf copy the other is a hardcopy

http://www.sewingpartsonline.com/instruction-manual-singer-touch-and-sew-630-and-640-download.aspx

http://www.sewingpartsonline.com/instruction-manual-singer-630-touch-and-sew.aspx

I have never seen them for free but there are sites online that sell the downloads for $10 for instruction and $12 for the service manual. I guess, it depends how important the machine is to you and how soon you want the information.

Hi
You can get a replacement manual for your machine from the Singer site, but they cost around $15.
http://www.singerco.com/accessories/manuals.html
Just type in the model number (640) and click on search.
The Singer site have a usefully FAQs section.
http://www.singerco.com/support/faqs.html
Just click on the question My needle keeps breaking and the answer will appear.
Hope this helps!