US1408608A - Rolling machine - Google Patents

Description

K'. KRE YER. ROLLING MACHINE.

APPLICATION FILED SEPT. 30, 1915 1,408,608. Patented Mar, 7,1922.

UNITED STATES PATENT OFFICE.

ROLLING MACHINE.

Specification of Letters Patent Patented Mar. '7, 1922.

Application filed September 30, 1915. Serial No. 53,347.

(GRANTED UNDER THE PROVISIONS OF THE ACT 0F MARCH 3, 1921, 41 STAT. L, 1313.)

To all whom it may concern:

Be it known that I, KARI KREYER, a subject of the German Emperor, and residing at Dusseldorf, Germany, have invented certain. new and useful Improvements in Rolling Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in rolling devices, the chief object being to effect a graduated retardation of the workpiece holder as it approaches the end of its stroke and thereby avoid shocks and facilitate its return for the next working stroke.

According to this invention, the device comprises a cylinder containing a fluid operated piston connected to the work-piece, the arrangement being such that pressure fluid is admitted to the respective sides of the piston so that the differential pressure thereon is gradually reduced as the piston approaches the end of its working stroke.

In order that. the said invention, may be clearly understood and readily carried into effect the same will now be described more fully with reference to the accompanying drawings, in which Figure 1 is a longitudinal section of the device, and

Figures 2 and. 3 show details thereof in. section.

(.I- is a cylinder provided with an inlet 6, in a piston working therein and connected to a mandrel h by means of a piston j and a connecting piece 2'. The workpiece g is placed on the mandrel h and is acted upon by the rollers w and 2 The front and the rear ends of the cylinder are connected by the conduits c and Z). The conduit 0 is controlled by a valve f so constructed that its valve body a is acted upon by a spring-25 which abuts against a plate 8 fixed to one end of a spindle Tlns valve-spindle q is screw-threaded and can, therefore, be adjusted in the valve case (Fig. 3).

The conduit 6 is controlled by a valve (Z (Fig. 2) of a construction similar tothat of the valve f. The valve d is provided with an adjustable spindle on having an enlargement or plate a, this plate being acted .upon by a spring p arranged between the plate a and the valve body 0.

In the position shown in Figure 1, the motive fluid (viz: compressed air) on entering the inlet 6 acts on the piston 70 to cause it to move the work piece 9 to the rlght, i. e. into operative position with respect to the rollers m, y.

This forward movement of the piston and the work piece can be effected only after the work piece is released by the projecting parts of the rollers pressing upon it. As soon as the work piece is released the piston 70 slides forward and moves the work piece 9 to the right. Before this movement takes place, however, a portion of the motive fluid enters the cylinder at the rear of the piston la, owing to the fact that the pressure of the air in that part of the cylinder is lower than the pressure of the motive fluid in consequence of a suction caused by the preceding backward movement of the piston 7:. The motive fluid passes through the conduit 0 and the valve 7 overcoming the resistance offered by the spring t and the weight of the valve body a, and forms a cushion at the rear of the piston 70. As the piston it approaches the end of its working stroke, the pressure of the cushion increases until it counterbalances the pressure of the motive fluid. In the event of the pressure at the rear of the piston exceeding that of the motive fluid acting on the front of the piston, the cushioning fluid at the rear of the piston is allowed to escape through the valve (Z.

By suitably adjusting the valves, i. e. by varying the weights of the valve plates and adjusting the tensions of the springs, it is possible to regulate the pressure of the cushion at the beginning and end of the stroke, and thereby the speed of the work piece in its forward movement can be made to accord with the rotary speed of the rollers.

A further advantage of this invention lies in the fact that the cushioning fluid is re turned to the working side of the piston, so that none of the motive fluid is wasted.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a rolling device, the combination of a cylinder, 21 fluid operated piston therein which is connected to the work piece,v means for admitting motive fluid from one side of said piston to the other to form a fluid pressure cushion in said cylinder, and means for leading fluid from said. other side of the piston out of the cylinder when said. fluid pressure cushion exceeds a predetermined pressure.

2. In a rolling device, the combination of a cylinder, a fluid operated piston therein which is connected to the work-piece, a conduit connecting the front and rear ends of the cylinder at opposite sides of the piston, an adjustable valve located in said conduit for controlling the flow 0t motive fluid therethrough, means providing an outlet from said rear end of the cylinder, and an adjustable valve controlling said outlet means.

3. In a rolling device, the combination of a cylinder, a fluid-operated piston therein which is connected to the Work-piece, means for leading fluid from one side of said piston to the other to form a fluid-pressure cushion in said cylinder, and means for lead ing [fluid from said other side of the piston back to the first mentioned side of said piston.

l, In a rolling device, the combination of a cylinder, a fluid-operated piston therein which is connected to the Work-piece, a conduit connecting both ends of the cylinder at opposite sides of the piston, an adjustable spring-pressed valve located in said conduit .)Q1.ll'1lttlng of the flow of pressure fluid from the working side of the piston to the rear thereoi a second conduit connecting both ends of the cylinder at opposite sides of the piston, and an adjustable spring-pressed valve located in said second conduit and permittingof the return of the pressure fluid to the working side of the piston.

In testimony whereof, I aiiix my signature, in presence of two Witnesses.

KARL KREYER.

Witnesses i J. D. ZIESECK, GIVENNIE OBERGETHMANN.

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