The origination of the laser printer
Xerox were the first inventors of the laser printer, but IBM were the first to release a commercial version of it. This model, called IBM 3800 came out in 1976. By 1981 the first real laser printer made for personal use had been released. This model was called the Xerox Star 8010. Although this was a very efficient and useful tool, it did not go across the market too well. It was very expensive, selling at $17 000 for every unit. Not many companies were able to afford it. Approximately 100 000 units were sold.
Many improvements have undergone in the past 30-40 years for the laser printer. Although this is occurring, and its being for the best, the principles are still the same.
What does it have to do with electrostatics?
The paper which glides through is at a very negative state and this attracts the positively charged ink which had already appeared on the drum. It is essential that the paper has a stronger negative charge than the strength of the positively charged ink so that the image can be transferred on to paper instead of permanently being on the drum. The reason why paper is so heated when it comes out of the printer is so that the ink can be assisted to permanently remain in the paper fibres.