Safeguards for machine tools and power presses by Unknown

Author:Unknown
Language: eng
Format: epub
Tags: Machinery -- Safety appliances, Accidents -- Prevention
Publisher: New York city, The Industrial press

gate expands from the side, its movement being controlled by tlie bar A. As the slide descends, this bar, which is attached to it, engages a cam carried by the pivot on which lever B is mounted. This swings lever B down into a nearly horizontal position, as shown in Fig. 8, and expands the pantograph gate across the front of the die, through the leverage exerted by the extended arm C of the gate. The action of the mechanism is so timed that the gate shuts off access to the die before the punch has descended upon it. When the ram rises, bar A is carried up with it. This releases the mechanism, and the gate is closed by the tension of spring D; E is simply a guide in which the gate travels.

The Jones Stamping 1 Press Guard

The press illustrated in Figs. 10 and 11 is equipped with a safety device known as the Jones stamping press guard, which is manufactured by the Jones Safety Device Co., Chicago, 111. When in operation, the wire-mesh gate drops somewhat ahead of the down-stroke of the ram, thus barring the operator's access to the die during the working stroke. The design is such that the gate must reach the bottom of its stroke, which brings it into contact with the table, before the clutch can be engaged.

The operation of the guard is controlled by lever A, which is pivoted to the frame of the press. Connection is made between the treadle and the clutch by means of two rods which are secured to this lever by adjustable clips. When the guard is to be applied to an inclinable press, the treadle rod is in two sections, which are threaded at their ends to carry an adjusting clip, so that the length of the rod can be varied as required.

When the treadle is pushed down to trip the press, lever A carries the gate down to the table. If the operator fails to remove his hand from the die, the descent of the gate is blocked and this prevents the press from operating, because the clutch cannot be engaged until the gate has reached the bottom of its stroke. After the ram has completed its working stroke and started to rise, the gate is immediately lifted by the action of a spring which connects the rear end of lever A and the frame of the press. If it is more convenient, this spring can be attached between the treadle and the frame of the machine. The instantaneous action of this spring prevents the output from being reduced, as the guard is out of the way as soon as the ram has risen sufficiently to enable the operator to begin preparing for another operation.

Clip B, which secures the gate bar to lever A, enables the position of the guard to be adjusted to meet the requirements of different classes of work and dies. The gate should always be set to a point where it touches the table before the clutch can be engaged.

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