USRE4776E - Improvement in pistons for printing-presses - Google Patents

Improvement in pistons for printing-presses Download PDF

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Publication number
USRE4776E
USRE4776E US RE4776 E USRE4776 E US RE4776E
Authority
US
United States
Prior art keywords
pistons
presses
printing
piston
improvement
Prior art date
Application number
Other languages
English (en)
Inventor
Vert B. Cotte Ell
Publication date

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  • Figure 1 is a longitudinal section of apart of a printing-press on the line aa: of Fig.2, showing my improvement.
  • Fig.2 is a horizontal section.
  • Fig. 3 is a section through the piston on the line y y of Fig. 4.
  • Fig. 4 is a section on the line 2 z of Fig. 3 5 and
  • Fig. 5 is a side elevation of the piston.
  • A represents the cylinders
  • B the pi stons employed in these presses to effect the. stoppage of the table by the compressionof the air in the cylinders behind the pistons.
  • the pistons have been solid, or, at least, so unyielding that the paper falling in front of a cylinder so as to be forced into it would pack so hard as to stop the press, requiring great force to release the'piston, and sometimes breaking thecylinder and other parts.
  • This I port therefor arranged on the periphery of disk F, and sustained a considerable distance therefrom by the radial coiled springs H, or in an y other way, so that the said spriiigG or other device or devices used instead may have considerable movement radially when required.
  • the coiled flat spring G may be sufliciently strong to hold the elastic packing against the cylinder with suiiieient pressure without the aid of the springs H, which will be needed kind be used instead of the spring G.
  • the flexible packing D will be contracted a little at the side of the piston which enters the cylinder first, as shown at K, toprevent catching on the rim ot the cylinder, and the latter will be reamed out, as at I, for the same object.
  • I have represented springpins L, attached to the side of the piston for holding the spring G from escaping by their radial points passing through a flange of the disk F and projecting in front of the edge of said springs.
  • the pistons will be provided with a valve, M, to "admit air behind them, when withdrawing, to supply the place of that escaping past the packing when the piston goes in, toprevent the action of a vacuum against the piston when withdrawing.

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