About 8am on 8 April 1992, the plaintiff noticed that the staff were feeding theatre greens from Calvary Hospital in at the top end of the Louise roller ironer but nothing was coming out the other, or bottom end of the machine. The plaintiff said that the able bodied person in charge of the disabled workers at the top end of the machine was not there. The plaintiff decided to investigate the cause of the problem. The machine was stopped. The plaintiff got under the machine at the point where the conveyor passes the work from the ironing-drying section, to the folding section. It was quite easy for the plaintiff to do this as the conveyor at that point sloped down from about head height over a distance of a few feet to about four feet above the ground where the work is delivered to the rollers in the folding section. The plaintiff said that she got in under the conveyor and then squatted or knelt down underneath the first roller on the folding section and looked up to see if she could detect the cause of the problem. She saw a pair of theatre greens wound around a roller so she reached up and tried to pull them free. She gave them several tugs but was not successful. Accordingly, the plaintiff clambered out from underneath the machine, shut it down completely and sent a message for the fitters to come and attend to the problem. It was the kind of thing the plaintiff had done many times in the past. She said that nine times out of ten she was able to fix the problem and it had not been necessary to send for the fitters. After the plaintiff had got out from under the machine, she experienced no pain, but about an hour and a half later, she began to feel, not pain, but discomfort in her right shoulder. She made an accident report to another supervisor. Dr Francis, rheumatologist, subsequently diagnosed a subacromion impingement arising from a relatively minor traumatic incident to the rotator cuff, but without any evidence of rotator cuff tear.