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US 2003/0193400 A1Published application
Safety system for machine tools
AssigneeNone recorded
InventorsGiorgio Grasselli, Santini Stefano
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AssigneeNone recorded
InventorsGiorgio Grasselli, Santini Stefano
Estimating the term…
Safety system for a manufacturing machine provided with at least one tool which can injure the operator, comprising a pair of gloves to be worn by the operator and provided with an outer surface of dielectric material and an electrically conductive inner surface; an alarm signal generator connected to said conductive inner surface; a processor unit connected to the metal machine members and to said at least one tool via a safety circuit arranged to sense said alarm signal when the operator cuts one of said gloves on coming into contact with one of the mechanical members of the machine, said processor unit being provided with means for interrupting machine operation on sensing said alarm signal, in which said alarm signal is an alternating current signal the intensity of which is established by said processor unit on the basis at least of the physical characteristics of the operator as measured by a suitable circuit for determining at least these characteristics.
A safety system for a manufacturing machine provided with at least one tool which can injure the operator, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
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This invention relates to safety devices provided in manufacturing machines to safeguard operator safety.
In particular, the safety system of the invention is applicable to any type of manufacturing machine having at least one moving member or tool with which the operator can accidentally come into contact. Manufacturing machines are generally provided with systems ensuring operator safety.
These systems can be either mechanical or electrical.
The safety system of the invention is described hereinafter with the aid of the accompanying drawings, in an embodiment for application to a flaying machine, it being apparent however that the application of the invention is not limited to this type of machine.
FIG. 1 is a schematic representation of the safety system of the invention applied to a flaying machine.
FIG. 2 is a block diagram of a first circuit with which the system of the invention is provided.
FIG. 1 shows a usual flaying machine 1 provided with a toothed roller 2 rotated by the electric motor 3 via the toothed belt 4.
The roller 2 drags a piece of meat 6, held manually by the operator 7, to subject it to the action of a fixed blade 5 able to interact with the piece of meat 6 to separate the skin from the flesh of the meat. The task of the operator 7 is to urge the piece of meat 6 against the roller 2, his hands hence operating in proximity to the roller 2 and blade 5.
As can be seen from the figures, for correct operation of the system the operator 7 must wear a pair of dielectric gloves 8, shown in FIG. 4, preferably provided with a metal or otherwise electrically conductive inner surface 41.