US1252278A - Attachment for the feed-bars of die-presses or the like. - Google Patents

Description

APPLICATION HLED FEB. 23, 1917- L252,278.

Patented Jan. 1, 1918.

4 SHEETSFSHEET I.

Eu? 25v WITNESS h I mmv oga. Charles 12M flonadcd.

A TTORNEYS.

, C. D. McDONALD. ATTACHMENT FOR THE FEED BARS 03015 PRESSES ORTHE LIKE.

APPLICATION FILED FEB. 23. 19!].

Patented Jan. 1,1918.

IN V EN TOR. Charles 171% 170- A TTORNEYS.

C. D. MCDONALD. ATTACHMENI EOR THE FEED BARS OF DIE PRESSES OR THE LIKE.

APPLICATION FILED FEB-23,19l7.

Patented Jan. 1, 1918.

4 SHEETS-SHEET 3- k A C INVENTOR. (523 //.M 170W.

'ATORNEYS.

WITNESS C. D. McDONALD.

ATTACHMENT FOR THE FEED BARS 0F DIE PRESSES OR THE LIKE.

APPLICATION FILED FEB-23,1917.-

1 ,252,278, I Patented Jan. 1, 1918,

4SHEETS-SHEET 4. 1

l t- 2* E fl i OML/ I 7 g 'INVENTOR. WITNESS I CharZc sflflwomld.

BY Ml v l A TTORNEYS.

" oNrrED STATES PATENT mm CHARLESD. MCDONALD, OF CHICAGO, ILLINOIS.

ATTACHMENT FOR THE FEED-BARS OF DIE-PRESSES OR THE LIKE.

To all whom it may concern.

' Be it known that I. CHARLES D. lVIcDrm- ALD, a citizen of the United. States, residing at Chicago, in the county of Cook and-State of Illinois, have invented certain new and useful Improvements in Attachments for the Feed-Bar of Die-Presses or the like, of which the following is a specification.

The present invention relates-to an attachment adapted to be used in connection with the automatic feed-bar or feed-mechanism between the drive-shaft and the operative portions of the pressv whenever an obstruction is encountered by the feed-bar which prevents the normal movement thereof, whereby 'a continuing operation of the d1e' and associated parts of the press after the feed of the work is stopped, is eliminated,

and the danger of wear and tear, and oftentimes serious injury to the press, is avoided. A further object of the invention is to employ 'a mechanism for carrying out the above purpose which will be capable of use in connection witha feed-mechanism, using a releasable connection between the feedbar and the partfor operating the same.

A further object of theinventioiiis to employ a shift'able means which will be actuated upon stoppage of the feed-bani, and to arrange a connection between such shiftable means and certain clutch and brake'mechanism so that upon operation of the-shiftable means, furthercommunication of power from the drive-shaft'to the operative portions of the press is cut off.

Theinvention further consists in the fea tures of construction and combination of,

ment for correction.

parts hereinafter described and claimed.

In the drawings: I Figure l is a side view of a die-press body, showing the means for operating the feeding-mechanism, and showing the device of thepresent invention in operative position; Fig. 2, a detail front view, showing the feed-bar and its connection, together with the attachment of the present invention, and

with the parts in the position they assume during the normal operation of the feedbar:

Specification of Letters Patent.

Patented J an. 1, 1918.

Application: filed February 23, 1917. Serial No. 150,447.

Fig. 3, a view similar to Fig. 2, showing the. parts in the position they assume when the feed-bar encounters an obstruction preventing its normal movement, and with the feed-bar released from its operating member and the attachment of the present invention -moved so as to set the mechanism which breaks the connection. between the powershaft and the operating portions of' the P s Fig. 4, a view of the mechanism which makes and breaks the connection between the power-shaft andthe operative portions of the press, and showing such'connection in released position, which is the position .assumed when a connectlon 1s being mamtained between the drive-shaft and opera- Fig. 8, a detail face view of the clutch mechanism;

Fig; 9,75 detail, partly in section, of the clutc mechanism; and

Fig. 10,11; detail showing one of the which-actuate theclutch mechanism.

arms

In connection with automatic die-presses, areciprocating feed-mechanism in the form of a bar is generally employed for moving the workstep by step into operative posi-.

tion below the die plunger. Owing to irregularities in the work, or a misplacement of the work during the feeding operation, the

work becomes jammed in the feed way, and upon a continued'opera'tion of the feed-bar, necessarily a condition arises which is detrimental to the machineand requires a stoppage of-the machine and a partial dismantle- In Patent No.-'1,039,565, granted September 24, 1912, to C. D. McDonald, for metal working machines, there is shown a releasable attachmentbet'wem the feed-bar and the crank-arm, which operates said bar,-

tion of the difficulty in connection with the the feed-bar from continuingto pound the choked work, and thus increasing the chok ingof the feed passage. However, this re leasement of the feed bar resulted onlyin stopping the operation of the feed-bar. The

remainder of the mechanisms of the press continued to operate. The die plunger continued to pound into the female die, oftentimes creating a mutilation of the die or placing a stra n on the crank-shaftwhich operates the die, so that said shaft was bent,

Either of the above conditions, of course, is detrimental and requires replacement of parts, which is not only expensive, by reason of the cost of. new parts, but, further, in that the press is put out of service for a great'ei or less length of time. I In the present invention, when a choking of the feed channel-is encountered, the feedbar isnot only released from engagement with the crank-arm and its movements stopped, but such releasing operates automatically certain mechanisms which cut off thesupply of power from'the crank-shaft to theremainder of the operating portions of the press, thus stopping the entire press mechanism and eliminating the damage heretofore referred to, which may result from a continuing of the operation of the remainder of the press mechanism afterthe feed-bar has ceased to operate.

In the drawings, illustrating one embodiment of my invention, I have shown a press body 11, which may be of any suitable size and style; and mou'nted in said press body is a main driving-shaft 12. This shaft, as

. shown, is employed in connection with a reciprocating toggle arm 12 for operating the- 'die plunger. This toggle arm and its method of ope'ration'is fullyshown in my co-pending application Serial'No. 150,445,

filed-February 23, 1917, and entitled Ap'pli- V ances fordie-presses or the like, and a detailed illustration and description are not I deemed necessary in the present application,

' you particularly in view of the fact that'the present invention is deemed to be adaptable for application to presses whichv may employ a different method than .th'e'above for operating the die plunger.

As shown in the drawings,-and more particularly in Fig. 1, the crank-shaft 12 operates a gear l3'meshing with a gear 14 on a stub-shaft 15, which stub-shaft alsocarries a gear 16meshing with a gear 17 on a stubfshaft 18, on which shaft is also mounted a disk 19. Eccentrically secured to this disk is a rod 20, which, as shown, is pivotally connected to a head 21 mounted in a' slot 22 in a'rocking lever 23, pivoted at 24. The, head 21 is ad ustable back and forth in'the slot 22 so as to vary the degree of movement-imparted by the rod 20 to the lever 23. Connected to one free end of this lever a fork jammingabove set forth, since it prevented 25, to which is pivotally secured ahead 26 connected to a rod 27. This rod terminates in a head 28, from which extends a sleeve 29 Y bolted orotherwise secured to a flange 30 on.

a rocking arm 31 (see Figs. 1, 2 and 3). This rocking arm is pivoted to swing upon a pin 32, and its end 33 is entered between 1 spring jaws 34 held ,normally closed by when the feed-bar encounters an impediment to its normal movement within the feed channel, as by a j amming of the work within said'channel, the end 33 of thecrank arm 31 will pull out from between the jaws 34, breaking the connection between the crank arm .and the feed-bar and stoppingfurther movement of said bar.

The foregoing connection between the feed-bar and crank-arm is disclosed in my issued Patent No. 1,039,565, of September 24, 1912, and'heretofore referred to. No claim is made to this construction in the present case, other than may be in combination with the particular parts which relateto the presentinvention.

'As previously explained, while the discon-, necting of this feed-bar fromthe crank-arm will stop the operation of the bar, it will have no effect in stopping the operation of the remainder of the press mechanisms, and the presentinventi'on deals with the creation of power through the main drive-shaft to the balance of the press mechanisms when normal movement of the feed-bar is prevented by jamming of the work, etc.

To carry outthis automatic stopping in the construction shown, I employ a link 42 of amechanism for stopping the application pivotally connected by a pin 43 to the arm 37. The link '42 has a slot 44 in its lower end, in which rests a pin 45 on an arm 46, which is pivotally mounted upon a pin 47.

- The arm 46 has extending therefrom flanges 48, in the nature of a fork, and between which passes the stem 49, having an abutment 50 on one-end, and formed upon its opposite end with a head 51 connected to an arm 52, which is keyed or otherwise secured to a cross-shaft 53.

To the opposite end of the cro'ss-shaft53 is secured a lever 54 provided with a suitable hand grip (see Figs. 4 and 5). This lever -is limited, as-shown, in its up and down movements by means of adjustable stops 55.

Connected to the lever 54 is a link 56 joined to a rocking lever 57, one end of which latter lever is connected to a rod 58, which operates a brake spreader 59;

-' best illustrated in Figs. 8, Sand 10, and each embodies a cam or wedge-shaped face 67, which .is adapted to enter beneath a clutch pin68 and force said pin outwardly, breaking the clutch connection from the driveshaft to the remainder of the machine.

The clutch pin enters into a recess ina collar 69 ona fiy-wheel-70, and it is through this collar and pin that the connection is made from thefiy-wheel to. that portion of the drive-shaft that operates thepress-mecha-nisms. This form of-clutc'h is one well adapted for use with the toggle die-plunger operation described inmy co-pending appli cation heretofore referred to; but it is understood that this form of clutch is only shown for the purpose of illustrating one form adapted for use in connection with the present invention, since, of course, a variety of styles. of clutches might be employed, and particularly so if the die plunger should be operated by means other than the toggle arms.

The clutch illustrated is one which will act when the crank-shaft turns a half revolution after i the clutch-actuating arms are set, owing to the presence of a clutch arm on each side of the shaft. Thisform of clutch is desirable with presses in iwh-ich-the die plunger is actuated by toggle mechanism,

since,when so actuated, there are two'strokes -of thedie plunger to each revolutionxof the crank-shaft, andby arrangin the-clutch so that it will set when a 'hal completed, the clutch will act to stop the machine when the die plunger reaches the limit of its up-stroke. 1 It is to benoted that by'reason-of the various links and levers employed, the 'movement from the link 42 to the brake spreader and clutch-actuating arms 1 is amplified, so

that these latter parts'are enabled to per-' form their functions without undue strain being placed on the initial movable parts. The operation briefly is as follows When an obstruction is encountered inv the feedchannel, the resistance exerted on the feed-bar will arrest thcmovement of the latter, causing the end of the crank-arm 31 to pull out from the jaws 34. The arm 37 will then-fall by gravity, pushing downward the link 42 and the pin 45, through engagement with the end of the slot 44, will be forced downward, pushing down the arm 46 and pulling down the rod 49, as in Fig. 3. This downward movement of the rod 49 will pull the free end of the arm 52 downward, rocking the shaft 53., and causing the lever 54 revolution is r to swing from the position of Fig. 4 to that thewedge faces-of said clutch arms into the position whereby one or the other engages the pin 68, moving it out-of its recess within the hub 69 of the fly-wheel, andbreaking the connection to the main drive-shaft. This stops the entire press mechanisms and eliminates any danger'of damage through the plungerand other press mechanisms continuing to operate after the feed-bar has stopped. I

- To reset the machine, the crank-arm 31 is placed back in the position shown in Fig. 2, so that it is connected once more to the arm 37 and adapted to actuate the feed-bar. The lever 54 is then thrown from the position shown in Fig. '5 tothat shown in Fig. 4',

which rocks the lever 57 into the position means for actuating the feed means, means f for controlling the application of power to said power driven means, and means for actuating said power controlling means to stop the application of powerto said power driven means when said feed means encounter an abnormal resistance to their normal, movement, substantially as described.

2. In mechanism of .the class described, the combination1 of 5 feed means,. .power driven means 'for actuating the feed means, means for controlling the application of power to said powerdriven means, shiftable means for actuating said power controlling means and adapted to shift whensaid feed means encounter an abnormal resistance to theirnormal-operation, said shiftable means when so shifted moving the power controlling means to cut off the application of power to said power driven means, substantially as described.

3. In mechanism of the class" described,

the combination of feed means, power driven means for actuating the feed means, a releasable connection between the feedmeans scribed.

and the power driven means adapted to release when the feed means encounter an abnormal resistance to the1r normal .move- .ment, means for controlling the application of power-to said power driven means, and means actuated by the breaking of said releasable connection for moving the power controlling means and cutting off the application of power to said power driven means, substantially as described. w

4. In mechanism of the class described, the combination of feed means, power driven means for actuating the feed means, a releasable connection between the feed means and power driven means adapted to release when the feed means encounter anabnormal resistance to their normal movement, means for controlling the application of power to the power driven means, shiftable means for actuating the power controlling means and shifted by the breaking of said releasable connection, and when so shifted actuating said power controlling means to cut off the supply of power to said power driven means, substantially as de- '5. In mechanism of the class described,

. the; "combination of feed means, power [driven means for operating the feed means for controlling the application of.-

driven means for operating the feed means, means for controlling the application of power to'said power driven means, shiftable means for operating said ower controlling means and adapted to 'shi t when said feed means. encounter an abnormal resistance to their normal movement, a cross-shaft, a connection between said cross-shaft and said shiftable means, and aconnection between the cross-shaft and the means for controlling the application of power, whereby said shiftable'means .when shifted operate the power controlling means to cut off the application of power from said power driven means, substantially as described.

6. In mechanism of the class described,-

the A combination of feed means, power means,

power to said power driven means, 1 means for actuating said power controlling means,

said actuatingmeans moving by gravity whenthe feed means encounter an abnormal release when thefeed means encounter an' abnormal reslstance to their normal moveresistanceto their normal movement and "when 's'oi moved actuating said power-.con- V trolling means to cut off the application of 55 power, to' said power jdriven stantially as describedh 7. In mechanism of the class described, the combination offeed means, power driven'means for actuating "the-feed means, a releasable connection between the feed means and power driven means adapted to means, subsaid connection is broken,

the combination of feed fdriven means for actuating the feed means,

ment, a member moving by gravity when and means actuated by said movement of said gravity operated member for cutting off the application of power to said power driven means,

* substantially as described.

8. In mechanism of the class described,

means,

1 asdescribed.

I ,9. In mechanism of the classdescribed,

the combination -of feed means, power driven means for operating the feed means,

means for controlling the application of power gravity actuated member, a

power to said power driven means, shiftable means for operating said power controlling means shifting when the feed means encounter an abnormal resistance to .their normal movement, a connection between the shiftable means and power controlling means actuating when the shiftable means are shifted to cut ofi' the application of power to said power driven means, and said connection being arranged to amplify the movement from said shiftable means to said power controlling. means in transmitting movement between these parts, substantiallp as described. r r 10. In mechanism ofthe class described,

the combination of feed means, power driven means for operating the feed means, means for controlling the application of power to said power driven means, shiftable means for operating said power controlling means and shiftingwhen said feed means encounter an abnormal resistance to their normal movement, a series of links and -levers connecting said shiftable means and said power controlling means, said shiftablemeans when shifted actuating said link and lever connection tomove the power controllingmeans andcut ofl the application of power to said powerdriven means, and said connection servingvfurther to amplify the movement of the'shiftable means in transmitting such movement to the power controlling .means, substantially as described. Y

, CHARLES I).v MoDONALD.

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