What does a needle position servomotor do on leather sewing machine?

[CowBoyOUTLAW]

What does a needle position servomotor do on leather sewing machine? See below video link on YouTube.

 

[Wizcrafts]

48 minutes ago, CowBoyOUTLAW said:

What does a needle position servomotor do on leather sewing machine?

Facts only answer

As the video demonstrated, it allows the operator to precisely stop with the needle either fully up or fully down, no matter the speed you were sewing at. This means that whether you are sewing 1 stitch per second or 30, pressing down with your toe or heel in the designated manner will cause the machine to come to a dead halt with the needle up or down. This would be a useful combination for an operator who lacks good foot control (medical or injury causes).

Editorialized answer

I have the same type of machine in the video; a Cowboy cb4500. It has a 3:1 speed reducer and an analog servo motor with a simple rotary switch to limit the top speed. It ramps up smoothly from zero to the maximum speed as set by the knob. I can easily operate my machine at less than one stitch per second, then floor it on straightaways to sew at 10 or 15 stitches per second. As I approach corners, turns, or the end of the stitch line, I simply back off the speed pedal until I reach the end, then either reverse into the previous few stitches, or move the stitch length lever to the zero movement position and double tap it to lock in the threads. In my learned opinion, there is absolutely no need for a normal user, with good foot muscle control, on this type of machine (Juki 441 clone), to install a needle positioner and more expensive digital servo motor if it has a 3:1 reducer between the motor and machine.

[Constabulary]

Well, nothing really new in this video. However - does the needle positioning work in combination with a speed reducer?

[kgg]

4 hours ago, Constabulary said:

does the needle positioning work in combination with a speed reducer?

Great question, as some people have had problems in the past when trying to combine a speed reducer with a needle positioner on a electronic controlled servo motor. I didn't see one on the second machine with the speed reducer. 

8 hours ago, CowBoyOUTLAW said:

What does a needle position servomotor do on leather sewing machine?

Since price is always a factor what is the price of the servo motor and needle positioner?

kgg

[GritMercantile]

We have on our Techsew 4800 Pro. The EPS is invaluable for us and speeds up the process. I would agree that if you have good treadle control and EPS may not be needed. Is it nice to have? Yes, Have to have? No. Would we purchase another machine without it? No.

[CowBoyOUTLAW]

On 10/6/2022 at 10:22 PM, GritMercantile said:

We have on our Techsew 4800 Pro. The EPS is invaluable for us and speeds up the process. I would agree that if you have good treadle control and EPS may not be needed. Is it nice to have? Yes, Have to have? No. Would we purchase another machine without it? No.

“How many times a day you need to remove your hand from workpiece to the hand wheel for lifting needle, then remove the material?”EPS great for time saving, also avoid losing stitch when you turn material for changing direction.  

On 10/6/2022 at 7:07 PM, kgg said:

Great question, as some people have had problems in the past when trying to combine a speed reducer with a needle positioner on a electronic controlled servo motor. I didn't see one on the second machine with the speed reducer. 

Since price is always a factor what is the price of the servo motor and needle positioner?

kgg

Price is higher than other motor, due to its high performance. 

[CowBoyOUTLAW]

On 10/6/2022 at 11:41 AM, Wizcrafts said:

Facts only answer

As the video demonstrated, it allows the operator to precisely stop with the needle either fully up or fully down, no matter the speed you were sewing at. This means that whether you are sewing 1 stitch per second or 30, pressing down with your toe or heel in the designated manner will cause the machine to come to a dead halt with the needle up or down. This would be a useful combination for an operator who lacks good foot control (medical or injury causes).

Editorialized answer

I have the same type of machine in the video; a Cowboy cb4500. It has a 3:1 speed reducer and an analog servo motor with a simple rotary switch to limit the top speed. It ramps up smoothly from zero to the maximum speed as set by the knob. I can easily operate my machine at less than one stitch per second, then floor it on straightaways to sew at 10 or 15 stitches per second. As I approach corners, turns, or the end of the stitch line, I simply back off the speed pedal until I reach the end, then either reverse into the previous few stitches, or move the stitch length lever to the zero movement position and double tap it to lock in the threads. In my learned opinion, there is absolutely no need for a normal user, with good foot muscle control, on this type of machine (Juki 441 clone), to install a needle positioner and more expensive digital servo motor if it has a 3:1 reducer between the motor and machine.

Thank you!!

 

[CowBoyOUTLAW]

On 10/6/2022 at 2:14 PM, Constabulary said:

Well, nothing really new in this video. However - does the needle

On 10/6/2022 at 2:14 PM, Constabulary said:

Well, nothing really new in this video. However - does the needle positioning work in combination with a speed reducer?

work in combination with a speed reducer?

Thanks for your great question. We just tested, the needle position could not working well, but it is not about the synchronizer, but about mother board, we will upgrade the system ASAP

[CowBoyOUTLAW]

On 10/6/2022 at 7:07 PM, kgg said:

Great question, as some people have had problems in the past when trying to combine a speed reducer with a needle positioner on a electronic controlled servo motor. I didn't see one on the second machine with the speed reducer. 

Since price is always a factor what is the price of the servo motor and needle positioner?

kgg

Kgg, we fixed the problem, now the Kinedyne needle position synchronizer can work perfectly with speed reducer.

[Constabulary]

So how much speed reducer reduction will this motor / needle positioner now accept? 1:2, 1:3 or even more?

Does it matter how big the motor pulley is? Usually these motors comes with ~75mm pulley but most LW swap it to 40-50mm pulley.

I´m just a user but not an electronics geek so this question may sound stupid (maybe not).

Is there (probably) a way to adjust the "reduction acceptance" (I have no other word, sorry)  in the motor management menu? That would be a great feature.

 

Edited October 13, 2022 by Constabulary