Résumé : |
It may be of interest to you to know that the first mechanically operated spray finishing machine used for finishing leather was invented 46 years ago, in the year 1927. This new machine was designed and developed by A. C. Lawrence Leather Co., in Peabody, Mass. It was described in the patent, which was later issued in July, 1934, as "An Apparatus for Applying Coating Material to Leather or Hides for the Manufacture of Patent Leather." It was the intent of the inventor to use this device to improve the method of applying the varnish finish coats on patent leather. At the time this material was being applied by hand brushing or swabbing, a method which was slow and expensive.
The original machine was semiautomatic in operation and was arranged so that the spray gun carriage could travel continuously up and down in a vertical transverse motion. The leather to he sprayed was supported by rope toggles in a wooden frame which was suspended from an overhead monorail conveyor track. The frame was advanced horizontally by a motorized conveyor chain with an intermittent indexing movement and it remained stationary for each stroke of the spray gun carriage. |