Cutting device for machines for cutting hides and the like

Abstract

A cutting device for machines for cutting hides and the like, including an oscillating piston provided at its end with a cutting blade, the oscillating piston being actuated pneumatically by way of an inlet and an outlet, an oscillation chamber being defined by the lower and upper stroke limits of the oscillating piston, the device including a supply duct that leads to the oscillation chamber, the supply duct being regulated by a solenoid valve in order to raise the oscillating piston and consequently raise the cutting blade.

Claims

1. A cutting device for machines, comprising: an oscillating piston provided at an end thereof with a cutting blade, said oscillating piston being actuated pneumatically by way of an inlet and an outlet, an oscillation chamber being defined by the lower and upper stroke limits of said oscillating piston, said inlet being in communication with said oscillation chamber, said outlet being configured to be in communication with the oscillation chamber during a portion of a stroke of said oscillating piston, further comprising a supply duct that leads to said oscillation chamber, said supply duct being regulated by a solenoid valve in order to raise said oscillating piston and consequently raise said cutting blade, said supply duct being in communication with said outlet when said outlet is in communication with said oscillation chamber.

2. The device according to claim 1, wherein said supply duct that leads into said oscillation chamber in the raised condition of said cutting blade is disconnected from the outlet of said oscillating piston.

3. The device according to claim 1, wherein said supply duct that leads to said oscillation chamber is adapted to allow a pneumatic supply that is adapted to act on said oscillating piston in order to raise said oscillating piston.

4. The device according to claim 3, wherein said solenoid valve is adapted to be actuated following an interruption of the pneumatic supply when said cutting device is in the raised condition.

5. A machine for cutting, further comprising a cutting device according to claim 1.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Further characteristics and advantages of the invention will become better apparent from the description of a preferred, but not exclusive, embodiment of the device according to the present invention, which is illustrated by way of non-limiting example in the accompanying drawings wherein:

(2) FIG. 1 is a cross-sectional view of the cutting device according to the present invention, in the operating condition;

(3) FIG. 2 is a cross-sectional view of the cutting device according to the present invention, in the raised-blade condition.

DETAILED DESCRIPTION OF THE DISCLOSURE

(4) With reference to the figures, the cutting device according to the invention, generally designated by the reference numeral 1, comprises a piston 2 that can move in an oscillating manner and which supports a cutting blade 3 at one end.

(5) The piston 2 is moved in oscillation by way of pneumatic actuation.

(6) Conveniently, the piston 2 is provided with channels, 4 and 5, which, in its oscillation, are connected with an inlet 6 and an outlet 7.

(7) In particular, the channel 4 is connected with the outlet 7 while the channel 5 is connected with the inlet 6.

(8) The pneumatic actuation through the inlet and the outlet moves the piston 2 in an oscillating manner and thus, in conjunction, the blade 3 that is connected thereto.

(9) In the device according to the invention, a duct 8 is provided that is connected to the lower region of an oscillation chamber 9 that has two walls, an upper wall 10 and a lower wall 11, which define the maximum possible stroke of the oscillating piston 2. Such oscillation chamber thus determines the lower and upper stroke limits of the oscillating piston.

(10) Obviously, the stroke of the oscillating piston 2 can be less than the maximum possible stroke permitted by the chamber 9, just as the cutting of the material can occur with a stroke of the oscillating piston 2 of a lower value than the thickness of the material to be cut.

(11) When the oscillation pneumatic supply is cut, i.e. by cutting the supply to the inlet 6, the piston 2 stops oscillating and, at this point, by way of the duct 8, it is possible to direct pneumatic pressure so as to propel the piston 2 toward the upper stroke limit position.

(12) Such condition is shown in FIG. 2, in which the lower region of the oscillation chamber 9 reaches the maximum size, with the piston thus in the upper stroke limit position.

(13) In such condition, the blade 3 is raised from the material that is to be cut and an essential condition is that, in the raised-blade condition, the duct 8 for actuating the raising of the blade is not connected with the outlet, so as to ensure a good thrust force and without losses or consumption of pressure.

(14) The pneumatic actuation of the raised-blade command through the duct 8 is regulated by an adapted solenoid valve.

(15) It should be noted that the duct 8 through which pneumatic pressure is introduced does not interfere with the equilibrium of the oscillating piston during the oscillation of the piston, intervening solely upon interruption of the oscillation pneumatic supply by pushing on the oscillating piston.

(16) In practice it has been found that the device according to the present invention fully achieves the set aim and objects, in that it makes it possible to raise the cutting blade connected to the oscillating piston very rapidly and effectively, without such raising device interfering in any way with the oscillation of the piston under normal operating conditions, during cutting of the hide or the like by the cutting blade.

(17) The device, thus conceived, is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims. Moreover, all the details may be substituted by other, technically equivalent elements.

(18) In practice the materials employed, and the contingent dimensions and shapes, may be any according to requirements and to the state of the art.

(19) The disclosures in Italian Patent Application No. MI2014A000685 from which this application claims priority are incorporated herein by reference.