US2377824A

US2377824A - Die stop for punch presses

Info

Publication number: US2377824A
Application number: US476358A
Authority: US
Inventors: Strobl Samuel
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-02-18
Filing date: 1943-02-18
Publication date: 1945-06-05
Anticipated expiration: 1962-06-05

Description

June 5, 1945.

s. STROBL DIE STOP FOR PUNCH PRESSES Filed Feb. 18, 1943 7 In Me 22561: 56%6/5570ZZ- Patented June 5, 1945 UNITED STATES PATENT OFFICE urn STOP FOR PUNCH PBESSES Samuel 'Strobl, Chicago, In.

' Application February 18, 1943, Serial No. 476,358

2 Claims.

This invention relates to die stops for punch presses for controlling the feeding action of stock as it is fed through the die to position the stock for successive working strokes of the press to insure that openings? cut in the-stock will be umformly spaced apart. One object is to provide a I universal stop that is automatic in operation and adapted for'use on any blanking die.

A further object is to provide a stop of this type that is adapted for application to presses of different sizes, styles and types without alteration of the press or disfiguration of the same. A still further object is to provide a stop that is adjustable longitudinally and transversely of the line of travel of the stock thus making it applicable to be used on any blanking die.

A still further object is to provide a stop that is positive and efficient in operation, simple in construction, durable in use and that is readily applied to and removed from the press when desired.

With the foregoing and other objects in View the invention consists in the combination and arrangement of parts to be hereinafter fully described, pointed out in the claims and illustrated in the accompanying drawing which forms a part of this patent, and in which-- Fig. 1 is a view of the stop illustrating its application to a conventional punch press. I

Fig. 2 is a side view of'Fig. 1.

Fig. 3 is a view in elevational perspective of he stop showing only a fractional portion of the press frame to which two of the stop-supporting brackets are secured, an altered position of certain of the manually adjustable parts of the stop being shown in dotted lines, and,

Fig. 4 is an enlarged fragmentary view showing the stop-repositioning element comprising one end of the stop.

Like reference characters denote corresponding parts throughout the several views.

The present invention is adapted for use upon punching machines or power presses of the class embodying a reciprocable tool carrier I mounted in a frame l and carrying the tool 2 and movable toward and away from a die block 3 On which is disposed the die 4 through which the stock 5 is fed, the die having mounted thereon the strip per plate 6.

Secured to opposite sides of the frame and to the front thereof are the

brackets

1, 8 through which the control rod 9 freely extends, the ends thereof extending a short distance beyond their respective brackets, said rod being positioned a short space above the stripper plate and below the tool carrier in the topmost position of the same and rearwardly beyond a straight line connecting the rear edges of the tool carrier and said stripper plate to provide tool carrier clearance.

Collars ll, [2 fast upon the rod 9 between the brackets I, 8 are so positioned relative thereto as to limit the extent of the axial thrust of said rod in both directions, said rod at one end having fast thereupon the disc l3 that is connected to the bracket 8 by the coil spring M, the ends of said spring being fast in said disc and bracket and the spring coiled about said rod, said spring serving yieldingly to retain said rod in a position to keep the collar H in disengaged relation with the bracket 1 and collar l2 in engaged relation with the bracket 8, this rod and collar position being clearly shown in Fig. 1, said spring also exerting a slight twisting or rotating movement to said control rod 9.

Adjustably arranged upon the rod 9 is the coupling block i5 adapted to be locked in any desired position by means of the screw l5 extending into one end of said block for engagement with said rod. Also extending through block 15 at right angles to the rod 9 is the finger-bar I! that is adjustable longitudinally when not engaged by the screw 18 arranged in the lower end of said block, said finger-bar having at its forward end the downturned angular finger l9 adapted for engagement with the stock 5.

The finger-rod extends rearwardly from said coupling block beneath but in direct line vertically with the head of the tappet 20 that is carried by the link 2| and that is adjustable vertically toward and away from said finger-rod, said tappet being preferably threaded and engaged witha threaded perforation in said link and being provided with adjusting nuts 22 upon opposite sides of said link; Link 2| is secured by screw or pin,23 to a bracket 2 said screw being adjustable longitudinally in bracket slot to provide horizontal adjustment of said link and of said tappet. The bracket 24 is secured directly to the tool carrier 1 with which it moves or reciprocates. Normally the downturned end of the finger-rod iskept yieldingl in engagement with the stock by the spring [4. In Fig. 3 altered positions of the coupling block and finger-rod are shown in dotted lines. Varied positions of these members are made to accommodate the stop to stock of different shapes and designs.

In the normal position of the stop the downturned end of the finger-bar is in full line position, Figs. 1 and 2, in engagement with the stock and the collar l2 contiguous to the bracket 8,

while the collar II is spaced from the bracket 1. With the finger-bar in engagement with the stock or with the wall of one stock perforation, movement of the stock is arrested. The tool carrier is now in raised or partly raised position. As the tool carrier descends for engagement with the stock the tappet 20 descends therewith. Engagement of the tool with the stock is followed immediately by engagement of the tappet with the rear end of the finger-bar thus raising the downturned end thereof from the stock and permitting another advance of the stock. This movement of the finger-bar also tilts the coupling block slightly causing the same to impart a slight rotary motion to the rod 9 thus slightly twisting the spring 14 which will thrust the said rod axially or longitudinally. As the tool holder moves upwardly after its work stroke the tappet will release the finger-bar and the spring l4 again contracting will reposition the rod, finger-bar and coupling block to normal with the finger-bar engaging the newly punched out portion of the stock and being yieldingly so retained by said spring I 4 ready for the next work stroke of the press.

What is claimed is:

1. In a die stop for punch presses, a control rod, brackets freely connecting said rod to the press frame, collars fast upon said control rod immediately adjacent said brackets for alternate contact therewith as said rod is moved axially in opposite directions, a disc fast to one end of said control rod, a spring upon said rod connecting one bracket to said disc, a finger-bar, a coupling block connecting said finger-bar and control rod adjustably, a tappet disposed above said fingerbar in line therewith vertically, and a bracket carried by the press tool carrier adjustably carrying said tappet.

2. In a die stop for punch presses, a control rod, brackets freely connecting said rod to the press frame, collars fast upon said rod adjacent said brackets for alternate contact therewith as said rod is moved axially in opposite directions, a finger bar, a coupling adjustably connecting said finger bar and control rod for transmitting movement from one to the other, a tappet carried by the press tool carrier for actuating contact with said finger bar at the end of the working stroke of the tool carrier, and means connecting one end of said rod to one of the aforesaid brackets for imparting a longitudinal thrust and return movement to said rod after each couplingtransmitted movement thereof.

SAMUEL S'I'ROBL.