Toyota embroidery machine - retrofit

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02 Jun 2025 22:07 - 02 Jun 2025 22:09 #329571 by greg23_78
Toyota embroidery machine - retrofit was created by greg23_78
Hello everyone,

I need your advice on an industrial embroidery machine.
I've managed to recover a Toyota ESP embroidery machine, but it's broken down to the level of the electronic board, I have the impression that it has lost all its parameters, there's a ‘-’ on the screen and then nothing.

I'm going to retrofit it and drive it with linuxcnc.

Following the dismantling of the casings, I have a few questions:

-1: I have a DC 30W servomotor with 500 pt encoder in single ended 5V. and at the end of my axis I have a Copal JC30S potentiometer. Does this potentiometer correspond to a tacho (speed control)?

 

 

 

-2 : On my motor, the maximum voltage is not indicated. To power my machine, I use a power supply that mixes 5V and 24V DC. I assume that its motors are powered by 24V DC, correct? Do you know of any DC driver references for this motor power with tacho (if the potentiometer has one) 

 

 
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Last edit: 02 Jun 2025 22:09 by greg23_78.

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02 Jun 2025 22:29 #329573 by PCW
Replied by PCW on topic Toyota embroidery machine - retrofit
I think the potentiometer is being used as an absolute position feedback device.

(probably meaning that the long shaft only turns a few times)

 

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02 Jun 2025 23:25 #329575 by tommylight
Replied by tommylight on topic Toyota embroidery machine - retrofit

I think the potentiometer is being used as an absolute position feedback device.

(probably meaning that the long shaft only turns a few times)


 

+1

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03 Jun 2025 21:40 - 03 Jun 2025 21:41 #329634 by greg23_78
Replied by greg23_78 on topic Toyota embroidery machine - retrofit
OK, I understand.

But what is the operating condition of this potentiometer?

- Is it precise enough for me to use it for position control and the encoder for speed control?

- it only allows the machine to be homed without moving to a homing switch (the embroidery machine doesn't have a home and limit switch).

- does it allow homing and limit switches? If so, would a potentiometer for travel limits be useful in addition to the soft limit, or is the soft limit enough?

 
Last edit: 03 Jun 2025 21:41 by greg23_78.

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03 Jun 2025 22:07 #329636 by tommylight
Replied by tommylight on topic Toyota embroidery machine - retrofit
Does the pot have hard stops?
How many turns does it take to hit those stops, if any?
How many degrees can it turn, if it does less than 1 turn?

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03 Jun 2025 22:40 #329640 by PCW
Replied by PCW on topic Toyota embroidery machine - retrofit
Not sure how the potentiometer was used but It could replace home/limit switches
(and since it's absolute no homing cycle would be needed at startup)

The encoder is possibly used for both position and velocity feedback

Is there another motion axis?

 

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04 Jun 2025 07:26 #329669 by Aciera
Replied by Aciera on topic Toyota embroidery machine - retrofit

Does the pot have hard stops?
How many turns does it take to hit those stops, if any?
How many degrees can it turn, if it does less than 1 turn?



www.alldatasheet.com/datasheet-pdf/view/862058/COPAL/JC30S.html

 
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04 Jun 2025 07:31 #329670 by Aciera
Replied by Aciera on topic Toyota embroidery machine - retrofit

Is there another motion axis?
 


There is and it seems so be using the same potentiometer setup:

 
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04 Jun 2025 10:12 #329679 by andypugh
Replied by andypugh on topic Toyota embroidery machine - retrofit
I think that if you scale the potentiometer voltage to position, and latch it in HAL (you can do this with a mux component, with the output wired to the input, and triggered by machine-is-on) and add that to the scaled encoder position from the motor encoder, then you would have a "good enough" absolute encoder emulator.
Then configure HOME_ABSOLUTE_ENCODER in the INI

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04 Jun 2025 10:13 #329680 by andypugh
Replied by andypugh on topic Toyota embroidery machine - retrofit
You might want to set feed-hold when the needle is down, and release it when the needle is up...

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