I’ve never seen a coin op dry cleaning machine
I entered the dry cleaning industry at a time here in Calif when the state required a licensed operator to be on premises during times cleaning machine was operating.
In order to obtain a license there was a written and practical exam conducted. During part of practical part of the exam, and without being told, applicant was given a basket of various 12 inch sample fabrics. Applicant was required to stand at a spotting board..basket of 12 inch squares of different types of fabrics with various stains. Applicant was to identify fabric visually and by feel as well as identify stain..and remove stains there on the board in front of examiner. When finished, sample fabrics needed to be stain free, dry, with no ring. This goal was achieved by use of assorted chemicals at the board and with use of steam and air gun, spotting bone, spotting brush ect. Suction device built into spotting board could also be used.
I’m not sure what year the licensing for this was abolished. After abolishment. anyone trained by someone or by the manufacturer could operate machines.
Dry cleaning machine have evolved over the years.
When I started, it was common to have what was referred to as vented “transfer units” meaning two machines. The cleaning machine itself and the reclaimer (dryer) both vented outside.
Old or new cleaning machines operate by way of having two tanks containing the perc. The working tank was what we called “charged” meaning a percent of detergent and sizing was added.
While in operation a pump ran during operation which pumped solvent from the working tank into the basket/drum also through a set of filters. When cycle was completed, machine spins and pumps solvent back into working tank.
At that point with a transfer unit, clothes were taken out by hand and placed into reclaimer. (Dyer) Of if a dry to dry…machine automatically would go in to a drying cycle. During the drying cycle the solvent remaining in fabrics is heated with hot air and vapor turns back into a liquid which is caught and piped back into the machines 2nd tank, as it’s now pure and free of a charge.
During the day, tank levels were checked as sone solvent from tank 2 may need to be pumped back into the working tank and re charged.
Towards the end of my time in the profession I was working with a dry to dry unit that was not vented.
We were required to keep a log of how many pounds of clothes cleaned each day. And those numbers could be checked against the amount perc we purchased. A excess pec purchase could send up a red flag that there was insufficient extraction or a leak.
Knowing what I know about the process, I can’t imagine an untrained person fooling with a coin up dry cleaning machine. Formula for disaster. IMHO
On a comical note.. the inspectors would come by from time to time to check on things and they’d end up pulling up a chair and smoking cigarettes with us!
No one thought a thing about it.