Double sided Tape dispenser with one motor and constant V
Hello, everyone
I would like to construct a double-sided tape dispenser for a university project
The condition is to operate the whole thing with only one motor and that each time a certain length of xxx mm is conveyed. So that the speed V of the dispended remains constant.
Basically, it is like a large Tip-Ex roller, only that when the system is activated, the exact length of the adhesive comes out and the carrier film is wound up on a separate roll.
I see the problem with the circulation speed here because the diameter of the roll changes?
Does anyone have an idea here or maybe someone knows a similar system?
Thank you!
PS: Sorry for my english :)
Accepted answer
2 Other answers
3 methods come to mind:
1. A dancer detects the diameter of the tape roll and adjusts the speed (and linear feed) of the motor proportionally.
2. An encoder directly measures the dispensed tape to control the motor.
3. Use an encoder (or stepper motor) to keep track of the actual revolutions on the rewind spindle. Empirically develop the relationship of rewind revolutions to dispensed linear distance. At the beginning of the rewind, the amount dispensed is small per rewind revolution. At the end, the amount dispensed grows proportionally greater. If the carrier thickness and tension are relatively accurate then the linear feed could be calculated quite accurately.
What Lukas Stockinger is not realizing is that the professor is assigning the students with a "trick" project. The trick is on the double sided tape.
Common sense is using a roll dancer (tension device) when using plain tape (not sticky) and that was the first thing that came to my mind, of course it does not work. My first and original comment on this question solves the problem with just a couple rollers with diameters to cover the "length of xxx mm" with a gear engagement driven by a belt from a single motor, the same driven full cycle from the motor would have an arm acting as a cam with a ratchet tension that rotates the receiving end. it seems today the answer to a mechanical movement is always using complex electronics with components. If I was the student I would always approach the simplicity of mechanics before venturing into the easy way out.
