The incredible story behind the invention of conveyor belt sushi
Anyone who has visited a YO Sushi! restaurant will have experienced the marvel that is kaiten sushi.
The literal translation means ‘rotation sushi’ and refers to the way the dishes move around on a conveyor belt system.
The man responsible for this invention, Yoshiaki Shiraishi, developed the idea to overcome a problem he had as the owner of a busy sushi restaurant.
Like many people working in the industry, he found it hard to find the right staff and employee turnover was high.
Although managing people was difficult, he also found it hard to do all the work on his own.
He was caught between a rock and a hard place.
One day, after a visit to an Asahi beer bottling factory, an idea popped into his head.
He wondered if a similar conveyor belt system that was used to move the bottles could be adapted to solve his own problem.
Unfortunately, it wasn’t as simple as that and a number of issues plagued his early designs.
Firstly, Shiraishi-san considered natural materials for the belt but soon realised that frequent washing would rot them so he settled on stainless steel.
Secondly, he had to figure out the correct speed to move the plates.
Too fast and they would fly off the side. Too slow and they would anger impatient customers.
Then, he had to workout how to get the belt to go around corners.
Fortunately, that’s when Shiraishi-san experienced another moment of inspiration: observing a card game.
Watching the players fan out the cards in their hand gave him the idea of shaping the metal pieces of the belt in the same way.
Eventually, after five years of design and development, the Japanese restauranteur opened his first conveyor belt sushi establishment in 1958.
The concept was a roaring success and Shiraishi-san ended up opening 250 restaurants across Japan.
It wasn’t long afterwards that his brilliant idea spread internationally.
