US1965071A - Stamping and like press - Google Patents

Description

July 3, 1934. M E, DAVls 1,965,071

STAMPING AND LIKE PRESS Filed June 27, 1930 3 Sheets-Sheet l INVENTOR /7Al//?/6 E. DA W5 ATTO RN EYS July 3, 1934. M E DAVIS 1,965,071

STAMPING AND LIKE PRESS Filed June 27, 1930 3 Sheets-Sheet 2 INVENTOR ATTORNEYS July 3, 11934. M. E. DAVIS STAMPING AND LIKE PRESS Filed June 27, 1950 3 Sheets-Sheet 3 INVENTOH ATTORNEYS TnT 1'11- mm(a/mmmumlmn mmalllrmmmz Patented July 3, 1934 UNITED STATES ?ATENT OFFIQ STAMPING AND LIKE PRESS Application June 27, 1930, Serial No. 464,223

9 Claims.

This invention relates to stamping or like presses.

Heretofore, as such presses have been constructed, the operation of the cutting die against the bed plate has resulted in wearing of an uneven surface upon the bed plate which affects the sharp and true punching of articles in such presses. Provisions have heretofore been made for adjusting the bed plates from time to time, but the foregoing disadvantage is still present due to the fact that it is impractical to adjust the bed plate except after considerable uneven wear has resulted.

The present invention has forits chief object the provision in a press of a shiftable bed plate and means for automatically shifting the same controlled by the strokes of the press whereby the wear on the bed plate is automatically distributed. To attain this end, it is to be understood that the shifting movement of the bed plate must be quite small or slight as compared with the size tion are attained in the punch press shown in the accompanying drawings, and described below. It is to be understood that the invention is not limited to the particular form thereof shown and described.

Of the accompanying drawings,

Figure 1 is a side elevation of a punch press embodying the invention;

Figure 2 is a front elevation thereof;

Figure 3 is a sectional plan on line 33 of Figure 2;

Figure 4 is a section on line 4-4 of Figure 1;

Figure 5 is a section on line 55 of Figure 3; and

Figure 6 is a detail sectional view showing the manner in which the punching die is mounted in the press.

Referring to the drawings, the numeral 10 designates a punch press of a known type including a plunger 11 actuated by a driven shaft 12 and controlled by a foot pedal 13 as will be understood by skilled artisans. The plunger 11, as usual, carries a die 14 and is adapted to move the same toward and from a bed plate 15. This bed plate usually comprises material such as wood, fibre, etc.

In accordance with the present invention the bed plate 15 is mounted in the press 10 so as to be shiftable in its own plane, guides 16, 16 on the bed frame of the press having the bed plate 15 slidably engaged therewith (Figure 2) so that the bed plate 15 is movable forwardly and rearwardly. The bed plate may also be adjustable sideways in its own plane by suitable well-known constructions (not shown).

In order to shift the bed plate 15 automatically, the same may have a rack 17 aifixed to one side thereof with which is meshed a pinion 18 secured on a shaft 19. This shaft is adapted to be driven in reverse directions by means of reversing bevel gearing including bevel gears 20, 20 journaled in shaft 19 and a bevel gear 21 meshed with said gears. One gear 20 or the other is adapted to be clutched to shaft 19 by clutch 22. Gear 21 is secured on a shaft 23 arranged to be intermittently rotated in one direction only by means of a ball-clutch 24 (Figure 4).

Clutch 24 may be provided with an operating arm 25 slotted as at 26 and a pin 2'7 engaged in slot 26 is pivoted as at 28 to a pitman 29 operable by an eccentric 30 on the shaft 12 of the press so that upon each revolution of the press shaft in performing a punching operation, the bed plate 15 is shifted, the eccentric being arranged on shaft 12 so that the shifting of the bed plate occurs on a part of the stroke when the die is out of engagement with the bed plate.

In its preferred form, the invention contemplates the reversing movement of the bed plate between predetermined limits by automatic control of clutch 22. To this end the clutch shifting arm 31, which is pivotally secured as at 32 to a bracket 33, is formed with an integral bell arm 34, as shown in Figure 4. The arm 34 is pivotally connected to a collar 35 formed integral with a sleeve 36 which is slidably carried on a shaft 3'7 fixed to the bottom of the bed plate, in a position parallel to the direction of movement of the bed, by brackets 38. The end of the sleeve 36 opposite the collar 35 is also formed with an integral collar 39, the whole sleeve assembly being yieldably fixed to the shaft 37 through the agency of suitable means such as a spring pressed pin 40 which is adapted to fit in either one or the other of a pair of shallow recesses 41 formed in the shaft.

In order to move the sleeve assembly from forward to back position or vice versa, toggle links 42, 42 are provided which are pivotally connected at their centers by an upwardly extending pivot pin 43 so that they will slide on the sleeve 36 but will engage with either of the collars 35 or 39 upon the outward movement of the toggle. One lever 42 is pivotally secured as at 44 to a bracket fixed to the bed frame of the machine while the other lever 42 is pivotally fixed as at 45 to one end of a lever 46 pivoted in its length to a bracket 47 fixed to the bed frame. A spring 48 is fastened between the bed frame and the extending end of the lever 46 so that the toggle levers 42, 42 will be resiliently held to one side or the other of dead center.

Fixed to the bed 15 of the machine on brackets or otherwise are a pair of stops 50 which are adapted in the movement of the bed near the opposite ends of its travel to engage with the upwardly extending pivot pin 43 of the toggle levers 42, 42. In this manner the toggle levers are moved from against one collar up to and slightly past their dead center position at which time the spring 48 will cause the toggle to kick over to the other side and against the other collar which will move the sleeve assembly to swing the integral arms 31 and 34 thus reversing the clutch 22 and bed drive.

The spring pressed pin 40 engaging in one or other of the holes 41 serves to hold the collar and sleeve assembly either in its forward or back position and thus the clutch in engagement during the time one of the stops 50 is moving the toggle levers from engagement with one of the collars to past dead center at which time the toggle will kick over to the other side as above described. The kick of the toggle will move the sleeve and collar assembly to the other end of its travel, the pin 40 sliding out of engagement with the one recess 41 and into engagement with the other recess 41 as will be understood.

As seen in Figures 2 and 6 the die 14 is gibbed or otherwise secured to the press plate or head 1 l and held in position thereon by set screws so that it can be adjusted laterally thereof.

In operation it will be understood that each time the press is actuated the bed plate 15 will be shifted slightly in its own plane a short distance from one predetermined limit to the other as defined by stops, the movement of the bed plate being reversed as it reaches one limit whereupon it moves toward the other limit. It will be apparent that the invention is not limited in application to the specific forms illustrated and described. Accordingly various other modifications of the invention can be resorted to without departing from the spirit of the invention or the scope of the appended claims.

What is claimed is:

l. The combination in a cutting or punching press or the like of a supporting frame, a plunger carrying the cutting or punching element for vertically reciprocating said element in a single fixed line of movement in said frame, said punching element being substantially aligned axially with the axis ofthe plunger, a work-receiving bed-plate shiftably mounted on said frame against which said cutting and punching element operates to cut or punch through the work and over which the work is shifted after each cutting or punching operation to reposition the work for a succeeding cutting or punching op- 'eration, means for reciprocating said plunger, and means operable upon each actuation of the plunger for shifting said bed plate slightly as compared with the size of the punching element to distribute the wear of the cutting or punching element uniformly over the entire surface of the bed plate.

2. The combination with a punch press or the like, of a reciprocable plunger carrying a punch, a bed plate over which the work is shifted after 'each punching operation and mounted in the press so as to be shiftable in its own plane in opposite directions between predetermined limits, and means for distributing wear of the punch on the bed plate controlled by actuation of the press plunger for shifting said bed plate slightly as compared with the size of the punch upon each actuation of the press, whereby successive lines of contact of the punch with the bed plate will overlap, said means being reversible when said bed plate is moved to one limit or the other.-

3. The combination with a punch press or the like, of a reciprocable plunger carrying a punch, a bed plate over which the work is shifted after each punching operation and mounted in the press so as to be shiftable in its own plane in opposite directions between predetermined limits, means for distributing wear of the punch on the bed plate controlled by actuation of the press plunger for shifting said bed plate a short distance as compared with the size of the punch upon each actuation of the press whereby successive lines of contact of the punch with said bed plate closely overlap, said means being reversible, and means controlled by movement of the bed plate to one limit or the other for reversing said shifting means.

4. The combination in a punch press or the like of a supporting frame, a plunger carrying a cutting die for vertically reciprocating said die in a single fixed line of movement in said frame, said die being substantially aligned axially with the aXis of the plunger, a work-receiving bed plate shiftably mounted on said frame against which said die is adapted to operate to cut through the work and over which the work is shifted after each operation of the punch to reposition the work for a succeeding punching operation, means for reciprocating said plunger, and means operable upon each actuation of the plunger to shift said bed-plate slightly as compared with the size of the punch whereby said die will be operated in succession against said bed plate into lines of contact overlapping one another whereby said bed plate will wear slowly and uniformly.

5. A punch press including a punch, means for reciprocating said punch, a bed plate over which the work is shifted after each punching operation, means for distributing wear of the punch on the bed plate synchronized with said punch reciprocating means for shifting said bed plate in its own plane slightly as compared with the size of the punch upon each reciprocation of the punch, whereby successive lines of contact of the punch with said bed plate closely overlap, said means including a shaft, means for partially rotating said shaft in one direction upon each reciprocation of the punch, a rack on said bed plate, a pinion engaging with said rack, reversing clutch means connecting said pinion with said shaft, and mechanism operable by the movement of the bed plate to the end of its travel for .automatically reversing said reversing clutch means, said mechanism including a kick-over toggle linkage.

6. A punch press including a punch, means for reciprocating said punch, a bed plate over which the work is shifted after each punching operation, means for distributing wear of the punch on the bed plate synchronized with said punch reciprocating means for shifting said bed plate in its own plane slightly as compared with the size of the punch upon each reciprocation of the punch, whereby successive lines of contact of the punch with said bed plate closely overlap, said means including a shaft, means for partially rotating said shaft in one direction upon 150 ach reciprocation of the punch, a rack on said bed plate, a pinion engaging with said rack, reversing clutch means connecting said pinion with said shaft and mechanism operable by the movement of the bed plate to the end of its travel for automatically reversing said reversing clutch means.

7. A punch press including a punch, means for reciprocating said punch, a bed plate over which the work is shifted after each punching operation, means for distributing wear of the punch on the bed plate synchronized with said punch reciprocating means for shifting said bed plate in its own plane a slight distance as compared with the size of the punch upon each reciprocation of the punch whereby successive lines of contact of the punch with said bed plate closely overlap, said means including a shaft, means for partially rotating said shaft in one direction upon each reciprocation of the punch, a rack on said bed plate, a pinion engaging with said rack, reversing clutch means connecting said pinion with said shaft and mechanism for automatically reversing said reversing clutch means.

8. A punch press comprising a bed plate over which the work is shifted after each punching operation and a punch, plunger means for reciprocating said punch to and from said bed plate in a single fixed line of movement in said press, said punch being substantially aligned axially with the axis of the plunger means, and means for moving said bed plate in its own plane a slight distance as compared with the size of the punch upon each reciprocation of the punch whereby successive lines of contact of the punch with said bed plate closely overlap to distribute wear of the punch on the bed plate.

9. A punch press comprising a bed plate over which the work is shifted after each punching operation and a punch, means for reciprocating said punch to and from said bed plate, means for moving said bed plate in its own plane a slight distance as compared with the size of the punch upon each reciprocation of the punch whereby successive lines of contact of the punch with said bed plate closely overlap for distributing wear of the punch on the bed plate, said means including an intermittently rotated shaft, a reversible drive between said shaft and said bed plate, kick-over mechanism for reversing said drive, and means on said bed plate for operating said kick-over mechanism.

MAURICE E. DAVIS.

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