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Re: foot feed sticks at top then runs wide open
The resistor in the foot pedal has shifted up and out of position or is worn out and needs to be replaced. Opening up the pedal is easy, there are four screws on the bottom that are hidden under rubber pads that need to be pried up. There are two round ones that come out and one long strip at the other end that can be pried out. After opening up the unit just push down on the resistor to re-seat it. It is a small rectangular piece about 1" by 1/2". The big problem is putting it all back together which can be very difficult without someone showing you how, but people have done it before. I can't easily explain but you'll know it when you get it. You might want to take pictures as you go along. The biggest pit fall is that you can easily bend the contact spring which glides along the resistor and lives up inside the plunger (the plastic piece that actually touches the floor when in use). This is the most difficult part, I'm not sure if you want to try it or send it to the shop. If you don't keep track of where the contact spring is you can easily bend it, if you do you can bend it back. It is made of copper and can take a little bending no problem.
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what type of machine do you have. I have two that I operate with buttons and it has a little slide button to speed or slow down I don't know why it should run to fast with a foot pedal because you control the speed with your foot you may want to check to see if there is any trash that has gotten in the foot and somehow not allowing the foot to come back up
The foot control function for a motor run condition is variable from 4k ohms to 0 ohms with full depression of the foot control top plate. Heeling back on this control makes a 10k ohms signal for needle down function.
To remove the top cover, peel back the vinyl top covering to expose a single hole above each of the two plastic axle or hinge pins located on each side of the top cover. Insert a pin punch (or other tool)
appropriate in size through the hole, placing the pin end against the hinge pin and pry/pop out the hinge pin. Pull out the hinge pins and remove the cover. Reverse the process to assemble the cover. To insert the barbed vinyl projections on the bottom side of the vinyl top covering, moisten the projections with a little KY jelly and reinsert into the holes in the top plate. http://www.sewtechnical.com/
1. Remove any stuck material from the feed dog, bobbin area including the hook (pointed object under bobbin). Lubricate as you go.
2. Remove top and end of sewing machine to look at the motor and belt. Place pressure on the foot pedal. Still slow?
3. With bolt attached to motor release the pressure on the belt. Now, place pressure on the foot pedal. Did you notice any increase in speed?
4. Apply pressure on the foot pedal and simultaneously adjust the motor. Adjusting means tightening of the belt and making it move in a straight line. (If it doesn't move straight it puts pressure on the motor so it will move slow.) When you have adjusted the motor to the right position the motor will be at it's highest speed.
5. If the pressure foot is the problem it will require a pro to take care of it.
There is an adjustment on the machine itself that controls how fast the machine is able to run. It is just about the center of the machine, right above the work surface of the machine. It has one arrow, two arrows and three arrows. When the slider is at the one arrow, it is at the slowest speed. You can move that back and forth depending on how fast you want your machine to run. I hope this helps.
This is most likely a fault in the foot control. Normally supplied with this machine is a Type 10 and this can be fixed quite easily but probably not by the machine's owner unless you have some electrical and mechanical experience.
If you have knowledge of and access to a multimeter, you can test it. What working properly, you will find the following:
Pedal released: resistance is infinite (anything around 4k Ohms or less and the machine will run).
Heel pressed: resistance is about 10k Ohms.
Toe steadily pressed from nothing to all the way down: resistance is infinite then after a small depression, jumps to about 4k Ohms steadily decreasing to zero as the pedal reaches all the way down.
Your problem, being at the point where the pedal isn't pressed suggests that there's some contamination in the pedal. It's also possible that you have a type 365 pedal (as used on the 930) and this is more likely to give this kind of trouble due to the use of carbon brushes in this foot pedal.
You don't say whether your machine is newer or an antique. The model number would really help your helpers help you.
Let's work on your vocabulary a bit: A presser foot, is what holds the material down so the feed dogs and move it through the machine. The foot pedal is pressed to make the machine go. ;)
However this sounds like a machine that needs service... by your explanation of how you change the speed to fast and run it fast... it sounds like one of the modern electronic machines. Since modern machines don't have oiling and greasing guidelines I suspect your machine I well overdue for servicing. Find your local sewing machine tech and take it in. Ask for a "Clean, Oil and adjust timing" and be sure to mention the motor issue. While he's there ask him to check the belts and replace if necessary.
Sometimes the foot pedal sticks, tap on it a few times with your foot to get it to stop, if that doesn't work, unplug the machine for a few minutes then try, if that doesn't work then it will need to go in for repair.
Greetings, I experienced the same problem. Mine only ran a few stitches. Foot pressure on the foot feed was always "tension" problem in my foot.
I turned the foot feed around and upside down.
I press on the foot feed at the open end not the pivot (cord) end. This has given me much better control. Janome had no options for foot feed adjustment or replacement, but this has helped greatly. You may have to practice to get used to it