US2693159A

US2693159A - Stock removing device for presses

Info

Publication number: US2693159A
Application number: US276479A
Authority: US
Inventors: Albert G Taylor
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-03-14
Filing date: 1952-03-14
Publication date: 1954-11-02
Anticipated expiration: 1971-11-02

Description

Nov. 2, 1954 A. G. TAYLOR STOCK REMOVING DEVICE FOR PRESSES 2 Sheets-Sheet Filed March 14, vw52 m T m .fizbez a. Taylor A TTOR NE Y NV- 2, 1954 A. G. TAYLOR 2,693,159

- STOCK REMOVING DEVICE FOR PRESSES Hin@ n lzvmvrola. 4 .Hlber G/,faylor A. WMM

ATTORNEY y 2,693,159 y STOCK REMOVING DEVICE FOR lPRESSES Alber: G. Taylor, Flins, Mich.

Application March 14, 1952, Serial No. 276,479

6 Claims. (Cl. 113-50) The present invention relates to stock removal devices for use on presses or like machines and aims to provide a novel and improved apparatus of this character which can be conveniently attached to existing machines and which will efficiently receive parts after being worked upon by the machine and convey the parts away from the operating dies of the machine for deposit at locations where the parts can be collected safely.

An important object of the invention is to provide a device as indicated above wherein a movable work-receiving element controlled by operation of the machine is first rapidly moved to a position between operating dies of the machine during separation of said dies, then dwells in such a position a sufficient length of time to receive work disengaged from the machine by a knockout mechanism upon further separation of the dies, and then is started by an outside source of power to its return position with the work while said dies are still in the movement of separation.

Another object of the invention is the provision of a stock removal device attachable to a vertical or horizontal press or like machine, adjustable as to its position on the machine, adjustable according to the construction and operation of the machine, and having adjustments thereto for timing the various above-outlined operations of movement of the work-receiving, conveying, and depositing element.

It is also an object of the invention to provide a device y i of the above-indicated character which is substantial in construction, economical to operate, and thoroughly eilicient and practical in use.

These, together with various auxiliary features and objects of the invention, which will later become appari ent as the following description proceeds, are attained by the present invention, a preferred embodiment of which has been illustrated, by way of example only, in the accompanying drawings, wherein:

Figure 1 is a fragmentary side elevation and sectional view of a press with the improved device attached, showing the positions of parts when the ram of the press is in its downward position;

Figure 2 is a similar view showing the positions of parts just prior to the ram reaching its uppermost position;

Figure 3 is a horizontal section taken on line 3--3 of Figure 1;

Figure 4 is an enlarged horizontal section on line 4--4 of Figure l; v

Figure 5 is a fragmentary vertical section on line 5-5 of Figure 4;

Figure 6 is a fragmentary section taken on line 6-6 of Figure 5, showing the parts in the position illustrated in Figure 2;

Figure 7 is a section taken substantially on line 7--7 of Figure 1; and

Figure 8 is a section taken on line 8 8 of Figure 7.

Referring now more specifically to the accompanying drawings, wherein like numerals designate similar parts throughout the various views, attention is directed first to Figures l, 2, and 3 wherein it will be seen that there is indicated generally by the numeral 10, a portion of a press of an upright type used for stamping out or forming identical parts. The press has lthe usual frame with spaced uprights 11 supporting a slide 12 above a bed 13, a ram 14 vertically reciprocating a head 15 in the slide, a pair of dies with the parts 16 and-17 thereof xed to said bed and head respectively, and a knockout mecha- 2,693,159 Patented Nov. 2, 1954 nism 18 for removing the workpieces from the upper or punching die 17 after each operation of the press.

The improved stock removal device forming the subject of the invention and indicated generally by the numeral 20 has "a main supporting panel 21 adapted for attachment to the inside of one of the uprights 11 of the frame of the press by bolts 22 secured to the upright and extended through slots 23 adjacent the four corners of the panel. Spacer collars 24 of various thicknesses, shown in Figure 3, may be placed on the bolts 22 between the panel and the frame of the press for laterally positioning the panel relative to the press. while the slots 23 and an adjusting mechanism 25 permit vertical positioning of the panel. The panel adjusting mechanism 25 consists of a feed screw 26 threaded in a bracket 27 secured to the press frame and provided with a ball-and-socket connection 28 to the panel. The bolts 22 and slots 23 guide the panel during raising and lowering thereof by the feed screw 26and the bolts 22 clamp and hold the panel in place when same is in proper position.

Extending in a horizontal direction at the lower portion on the exposed side of the panel 21 is a dovetailshaped guideway 29 which slidably supports a bar 30 adapted to be projected and retracted from the forward end of said guideway. The guideway is constructed by attaching to the panel, with bolts 31, a pair of spaced gib strips 32. Carried by the bar 30 and laterally offset to a position midway between the spaced uprights of the frame of the press by an arm 33 attached to the forward projected end of said bar 30 is a rectangular-shaped tray 34 flanged upwardly, as at 35, along three sides thereof. The flange along the forward side of the tray is inclined rearwardly as it extends upwardly for a purpose which will be set forth as the description proceeds. The arm 33 is shaped and attached to the tray 34 for supporting said tray in advance thereof so that the tray can be passed between the guide pins 19 of the pair of dies k16 and 17, when the tray is moved to the position between separated dies, as shown in full lines in Figure 2 and dotted lines in Figure 3. v

Extending in a vertical direction at the upper portion and on the exposed side of the panel 21 is another dovetail-shaped guideway 36 which slidably supports therein a bar portion 37 of a movable bracket 3S. This guideway, like the guideway 29, is also composed of a pair of spaced gib strips 39 bolted to the face of the panel 21. An abutment 40 for limiting downward sliding movement of the bracket 38 is located at the lower ends of the gib strips 39, and a coil spring 41 connected to the bar portion 37 and to the panel 2l normally holds said bar portion 37 in engagement with said abutment.

The movable bracket 38 is constructed with a depending portion 42 rearwardly olset from and arranged parallel to the bar portion 37 thereof, and has the lower extremity of said depending portion projected slightly ice forward, as at 43. Upwardly on the depending portion' 42, there is pivotally connected, as at 44, a bell crank 45 having a horizontal leg 46 extending across and out of engagement with the bar portion 37, and a vertical downwardly extending leg 47 provided with an adjustment 48 for varying the length thereof. The lower end of the leg 47 extends across a face of the slidably supported bar 30 and is normally in engagement with an end of a spring-urged pawl 49 carried by said bar and movable into a recess 50 provided in the face of the bar, as clearly shown in Figures 4, 5, and 6. Upon pivotal movement of the bell crank 45 against tension of a coil spring 51 connected to the leg 46 thereof and to the portion 43 of the movable bracket 3S, the leg 47, due to its engagement with the pawl 49, slides the bar 30 forward in the guideway 29 and positions the tray 34 under the upper or punch die 17.

Attached to the head 15 of the press in a manner permitting adjustment to different elevations is a rearwardly extending rigid arm 52 to which is attached a block S3 that projects laterally to one side of the arm and under the leg 46 of the bell crank 45 for swinging the bell crank on its pivot and bodily moving the same upwardly upon upward movement of the press head. The block 53 has its upper surface centrally ridged as it extends to the side of the arm' for presenting line Contact with the underside of the leg 46 during pivotal movement of the bell crank and is adjustable longitudinally along the rigid arm 52 by extending slightly into a longitudinal slot 54 in said arm and having threaded therein a clamping bolt 55 that extends through the slot and engages the underside of the arm. On the bar portion 37 of the movable bracket 38 and in the path of swinging movement of the leg 46 is an adjustable stop 56 that is engaged by said leg to limit pivotal movement of the bell crank 45 during upward motion of the head of the press and to thereafter cause upward sliding movement of the bracket in the guideway 36 against tension of the spring 41.

Pivotally supported, as at 57, on and substantially at the center of the panel 21 is a second bell crank 58 having a short leg 59 thereof connected to a coil spring 60 which in turn is connected to the panel, and having the other leg 61 of greater length extending downwardly across the slidably mounted bar 30 and held in engagement with a shoulder 62 on said bar by the spring 60. The leg 61 is of suiiicient length to remain in contact with the shoulder 62 at all times; and to further assure Y the. rod 74 and spaced below the lock nuts 76 is a coil such contact, a guard rail 63 with its outermost surface flush with the outermost face of the bar 3i) and with opposite ends secured to the bar 30 provides a structure that embraces the lower portion of the leg 61. See Figures 3 and 4. The sole purpose of the bell crank 58 is to apply spring pressure to the bar 30 for immediately returning the same to its initial position upon the release thereof.

The forward edge of the lower end of the leg 47 of the bell crank 45 is beveled at an angle, as at 64, for presenting a vertical surface on said leg in engagement with the pawl 49 upon termination of the pivotal movement of said bell crank that provided for forward positioning of the tray, and during upward sliding engagement of the leg with the pawl that provides for the dwell for holding the tray in its forward position. Such a position of parts is shown in Figure 2. The extreme lower end of the leg 47 is rounded, as at 65, for permitting smooth release of the spring-urged bar 30 when the leg 47 is raised to a height above that of the pawl 49.

Return movement of the tray-carrying bar 30 to its rearward position is suddenly arrested by engagement thereof with a stop block 66 bolted to the panel 21 at the rear end of the guideway 29, which causes, due to the momentum gained during rearward movement, stock in the tray 34 to be slid from the rear unflanged side of the tray onto or into a dispersing mechanism which, for the purpose of illustration, is a chute 67, that directs the stock rearwardly between the spaced uprights 11 of the frame of the press.

Spaced from the outermost face of the bar 30 and the guard rail 63 forming a continuation of said face is a guide plate 68 shouldered, as at 69, and attached to the stop block 66 at its rear end, while its forward end is secured to spacer blocks 70 that in turn are secured to the gib strips 32. Between the guide plate 68 and the above-mentioned outermost faces is the space for movement of the lower end of the leg 47 of the bell crank 45 and the free end of the pawl 49 on the bar 30. The shoulder 69 stops rearward movement of the leg 47, while the plate is of sucient width for retaining the lower end of the leg 47 therebehind during the releasing operation of the bar 30. As shown in Figures 1 and 2, there is another guide element 71 above the guide plate 68 and it is secured to the panel 21 to aid in controlling the swinging movements of the

legs

47 and 61 of the

bell cranks

45 and 58, respectively.

For dampening the force of contact of stock ejected from the upper or punch die 17 onto the stock-supporting surface of the tray 34 and thereby preventing a rebounding of stock out of the tray, the knock-out mechanism 18 of the press is modified. The knock-out pin (not shown), that engages the stock and is operated by the knock-out bar 72 to disengage the stock from the die 17, has not been changed. The usual stationary support 73, which can be a part of the press frame, has a stationary depending rod 74 fixed thereto that projects through an opening 75 provided in an end of the knock-out bar 72 yand on which said knock-out bar freely slides during raising and lowering of the head of the press. Threaded on the fixed rod 74 below the support 73 is a pair of nuts 76 adapted to be adjustably locked together at different elevations on the rod. Resting on top of the knock-out bar 72 around spring 77 with a washer 78 thereon adapted to engage the pair of nuts 76 and apply a downward pressure on the knock-out bar just prior to the head 15 of the press reaching the top of its stroke. By adjusting the position of the pair of nuts 76 along the rod 74, the time of ejection of the stock from the die may be changed relative to the location of the head 15 on its upward stroke.

When stock is ejected onto the tray 34, the inclined forward flange 35 thereof tends to keep the stock downward on the supporting. surface of the tray at the time of rapid acceleration of the return movement of the tray by the spring-urged bell crank 58. While the use of a tray of the construction set forth is contemplated for certain classes of stock, it is to be understood that for other types of stock magnetic members, hooks, or special actuated ngers or gripping elements may be employed by attaching same to the reciprocating bar 30 for engaging and moving stock to positions away from the dies of the press.

After installing and adjusting the stock-removing device to a press according to size, construction, and length of stroke of the press, operation of the press is started; and while the head 15 vthereof is in raised position, material from which workpieces are to be made is placed and properly supported on the lower die 16. Upon completion of the downward stroke of the head 15 of the press, and an operation performed by the dies 16 and 17, the head rises during a portion of the upward stroke with the die 17 carrying the workpiece thereon before the stockremoving device is put into operation. When the block 53 on the rigid arm 52 carried by the head 15 engages and raises the leg 46 of the bell crank 45, said bell crank is swung on its pivot 44 causing the leg 47 of said bell crank, due to its engagement with the pawl 49 on the bar 30, to slide said bar 30 forward in the guideway 29 positioning the tray 34 under the raised die 17. Upon arrival of the tray to such a position, the leg 46 engages the adjustable stop 56 on the bracket 38, and the bell crank is prevented from further pivotal movement as the head 15 continues to raise. The upward force applied to the leg 46 is then transmitted to the bracket 38 which raises said bracket in the guideway 36, bodily moving the bell crank upwardly therewith. This causes sliding of the angled face 64 on the lower end of the leg 47 along the end of the pawl 49 and provides a dwell in movement of the tray while in such position. During this dwell, the spring 77 on the knock-out mechanism 18 has been compressed to such a degree that the knock-out pin is operated causing disengagement of the workpiece from the die 17 and permitting the workpiece to drop or be forced onto the ray.

Still further upward movement of the head 15 causes disengagement of the face 64 with the pawl 49, and the power of the spring connected to the bell crank 58 returns the tray to its initial position where it is suddenly arrested by the block 66 causing the workpiece to be thrown rearwardly therefrom. As the head 15 is lowered for the next operation, the

springs

41 and 51 return the bracket 38 and bell crank 45, respectively, to their normal and starting positions. The leg 47 of the bell crank snaps behind the spring-urged pawl 49, `and all parts are in position for the next operation.

In view of the foregoing description taken in conjunction with the acompanying drawings, it is believed that a clear understanding of the construction, manner of use, operation, and advantages of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention, various changes may be made without departing from the spirit and full intendment of the invention.

What isclaimed is:

l. A stock-removing device adapted for use with a press having a reciprocable head, said device comprising a slidably supported bracket, a bell crank pivotally mounted on said bracket, a member on said bracket for limiting pivotal movement of said bell crank, means carried by said reciprocable head engageable with said bell crank during movement of said head in one direction for moving said bell crank to the limit of its pivot-al movement and then moving saidbell crank and said bracket as a unit on the slidable support of said bracket, a workpiece-receiving member slidably supported for movement at substantially right angles to the sliding movement of said bracket, said workpiece-receiving member being moved to workpiece-receiving position by one leg of said bell crank during pivotal movement of said bell crank, said workpiece-receiving member being irst held in workpiece-receiving position by said leg and then released by disengagement of said leg therewith during sliding movement of said bell crank and said bracket as a unit, and other means for withdrawing said workpiecereceiving member from workpiece-receiving position.

2. A stock-removing device adapted for use with a press having a reciprocable head, said device comprising a slidably supported bracket, a bell crank pivotally mounted on said bracket, a member on said bracket for limiting pivotal movement of said bell crank, means carried by said reciprocable head cngageable with said bell crank during movement of said head in one direction for moving said bell crank to the limit of its pivotal movement and then moving said bell crank and said bracket as a unit on the slidable support of said bracket, a workpiece-receiving member slidably supported for movement at substantially right angles to the sliding movement of said bracket, said workpiece-receiving member being moved to workpiece-receiving position by one leg of said bell crank during pivotal movement of said bell crank, said workpiece-receiving member being rst held in workpiece-receiving position by said leg and then released by disengagement of said leg therewith during sliding movement of said bell crank and said bracket as a unit, spring means for withdrawing said workpiece-receiving member from workpiece-receiving position, and individual spring means for returning said bell crank and said bracket to their initial positions.

3. A stock-removing device adapted for use with a press having a reciprocable head, said device comprising a slidably supported bracket, a lever pivotally mounted on said bracket, an adjustable member on said bracket for limiting pivotal movement of said lever, an arm carried by said reciprocable head, an adjustable block on said arm engageable with said lever during one stroke of reciprocable motion of said head for moving said lever to the limit of its adjusted pivotal movement and then moving said lever and said bracket as a unit on the slidable support ofv said bracket, a workpiece-receiving member slidably supported for movement at substantially right angles to the sliding movement of said bracket, said workpiece-receiving member being moved to workpiecereceiving position by said lever during pivotal movement of said lever, said workpiece-receiving member being first held in workpiece-receiving position by said lever and then released by disengagement of said lever therewith during sliding movement of said lever and said bracket as a unit, and spring means for withdrawing said workpiece-receiving member from workpiece-receiving position.

4. A stock-removing device adapted for use with a press having a reciprocable head, said device comprising a slidably supported bracket, a bell crank pivotally mounted on said bracket, a member on said bracket for limiting pivotal movement of said bell crank, means carried by said reciprocable head engageable with said bell crank for moving said bell crank to the limit ofv its pivotal movement and then moving said bell crank and said bracket as a unit on the slidable support of said bracket, a workpiece-receiving member slidably supported for movement at substantially right angles to the sliding movement of said bracket, spring means for yieldably holding said workpiece-receiving member out of workpiece-receiving position, said workpiece-receiving member being engaged and moved to workpiece-receiving position against tension of said spring means by one leg of said bell crank during pivotal movement of said bell crank, said workpiece-receiving member being rst held in workpiece-receiving position by said leg and then released by disengagement of said leg therewith during sliding movement of said bell crank and said slidable bracket as a unit, and other spring means for returning said bracket and said bell crank to their initial positions.

5. A stock-removing device adapted for use with a press having a reciprocable head, said device comprising a slidably supported bracket, a bell crank pivotally mounted on said bracket, a member on said bracket adapted to be engaged by one leg of said bell crank for limiting pivotal movement of said bell crank, means carried by said reciprocable head engageable with said bell' crank for moving said bell crank to the limit of its pivotal movement and then moving said bell crank and said bracket as a unit on the slidable support of said bracket, a workpiecereceiving member slidably' supported for movement at substantially right angles to the sliding movement of said bracket, spring means for yieldably holding said workpiece-receiving member out of workpiece-receiving position, an adjustable extension on the other leg of said bell crank engageable with said workpiece-receiving member for moving same to workpiece-receiving position against tension of said spring means during pivotal movement of said bell crank, said workpiece-receiving member being first held in workpiece-receiving position during sliding movement of said bell crank and said slidable bracket as a unit, said adjustability of said extension permitting for an increase or decrease of the length of time the workpiece-receiving member is held in workpiece-receiving position, and other spring means for returning said bracket and said bell crank to their initial positions.

6. A stock-removing device adapted for use with a press having a reciprocable head, said device comprising a slidably supported bracket, a bell crank pivotally mounted on said bracket, a member on said bracket for limiting pivotal movement of said bell crank, means carried by said reciprocable head engageable with said bell crank for moving said bell crank to the limit of its pivotal movement and then moving said bell crank and said bracket as a unit on the slidable support of said bracket, a bar slidably supported beneath said bracket for movement at substantially right angles to the sliding movement of said bracket, a spring-urged pawl on said bar, a workpiece-receiving member on said bar, spring means for yieldably holding said bar in a position with said workpiece-receiving member out of workpiecereceiving position, said bar being moved against tension of said spring means by engagement of one leg of said bell crank with said pawl during pivotal movement of said bell crank for placing the workpiece-receiving member in workpiece-receiving position, said bar being held with said workpiece-receiving member in workpiecereceiving position by said leg during the tirst sliding movement of said bell crank and said slidable bracket in an upward direction as a unit, said leg being disengaged from said pawl during further upward sliding movement of said bell crank and said sliding bracket as a unit, spring means for returning said slidable bracket to its initial position and other spring means for returning said bell crank to its initial position for engagement of said leg thereof with said pawl.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,170,455 Mason Feb. 1, 1916 1,757,067 Weaver et al. May 6, 1930l 1,989,412 Gruchacz Jan. 29, 1935 2,283,505 Longield May 19, 1942 2,609,776 Sahlin Sept. 9, 1952