California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 8 - Points of Operation and Other Hazardous Parts of Machinery
Article 65 - Paper Converting and Printing Machines
Section 4436 - Job Platen Press (Class B)

(a) An automatic feed which does not require the operator's hands to be placed between the platen and bed, or

(b) An automatic stop which will prevent the platen from closing if the hand or hands of operator are caught between the platen and the bed, or

(c) A guard or gate, mechanically operated, which will throw the operator's hands out of the way as the press closes. If of the type which lifts the hands out of the danger zone the guard shall rise at least four inches above the platen as the press closes and descends by gravity or be drawn down by springs. The guard shall be arranged so that it will prevent a shear between the guard and the top of the platen, or

(d) Any other device that will prevent the platen from fully closing, if the hands of the operator are between the platen and bed.