Патент USA US2111308код для вставки
S B AX E N D A L E STOCK FEEDING MECHANISM Filed June 15, 1957 INVENTOR SAMUEL. BAXENDALE Wm ATTORNEYS Patented Mar. 15, 1938 2,111,308 UNITED STATES PATENT OFFICE 2,111,308 STOCK FEEDING MECHANISM Samuel Baxendale, Dearborn, Mich. Application June 15, 1937, Serial No. 148,421 2 Claims. The invention relates to stock advancing mechanisms used in connection with machine tools and of the type in which a reciprocating member is positively actuated through a pre determined amplitude of movement by mecha nism timed with the operation of the machine. With such feeding mechanism the length of ad vancement must be very accurately adjusted to correspond to the requirements of the work and this necessitates a readjustment for each change in the work. However, a simpler method of ad justment is to feed the stock bar against an ad justable limiting stop, but where this is used a positive feeding means would be disastrous. It 15 is the object of the present invention to obtain a construction where the actuating means for ad vancing the stock is positively reciprocated by the machine through a de?nite amplitude of. movement, but which, nevertheless, permits of 20 varying the length of feed by an adjustable stop. To this end the invention consists in the con struction as hereinafter set forth. In the drawing: Figure l is a central longitudinal section 25 through my improved feeder; Figure 2 is a cross section thereof on line 2-2 of Figure 1; , Figure 3 is a cross section on line 3—-3 of Figure 1; 30 Figure 4 is a side elevation. As my improvement is applicable to various constructions of machine tools forming no part of my invention I shall illustrate only the feed ing mechanism. As shown in Figure l, A is a 35 tubular member which at its rear end is pro vided with a threaded nipple B for engagement with a correspondingly threaded tubular feeding member C. This member is periodically actu ated by mechanism not shown, and in timed 40 relation to the machine tool and is reciprocated through a predetermined amplitude of move ment. D is a tubular member telescopically en gaging the member A and having a limited free dom of movement relative thereto. Preferably, 45 the bore of the member A is enlarged in diam eter in a portion E to form a shoulder F. The member D is also provided at its rear end with an enlargement forming a shoulder G for engag ing the shoulder F, and a portion H tapering from 50 said shoulder to a diameter less than the internal diameter of the member A. The member D is also longitudinally slotted at I to form a bifurca tion which is su?iciently resilient to permit of a slight contraction in diameter of the rear end. 55 Thus, by introducing the tapered end H into the (01. 29-61) outer end of. the member‘ A and then forcing the member D inward, the shoulders G may be sprung into engagement with the shoulders F. At the outer end of the member D is an enlargement J which forms a shoulder K, and a spring L sleeved on the member D extends between this shoulder and the forward end of the member A, thereby yieldably holding the shoulders F and G in en gagement. At the forward end of the member D is a one way clutch. 10 This is preferably formed by a plu rality of bores M through the enlarged portion J, entering through the outer end thereof and in clining toward the axis, so that their inner ends intersect with the bore of the member D. In 15 these bores M are placed balls N, and springs 0 bearing against these balls, urge the same toward the rear end of the bores J. However, the aper tures formed by the intersection of. the bores J with the main bore of the member D are not su?iciently large to permit the balls to drop therethrough. An abutment for the springs O is formed by a disk P which is placed in a recess in the forward end of the enlargement J and is secured by peening over the margin of this recess as indicated at Q, or fastening in any other way. With the construction as described, the balls N normally project into the bore of the member D so as to engage a stock bar passed there through. Whenever the member A is actuated in a forward direction through the medium of the tubular feeder C, the balls N will frictionally engage the stock bar. This will clutch the bar so that it will move forward with the members A and D, the latter being actuated by the spring 35 L. An adjustable stop R extending into the path of the stock bar will arrest movement thereof, whereupon the spring L will yield to permit the continued forward movement of the member A under the actuation of the member C. Upon the return movement of the members A and D the balls N will release the stock bar, but will re engage the same on the next succeeding forward movement. The construction as above described is formed of a relatively small number of elements all of which are easily manufactured and easily as sembled. It forms a very effective and positive feeder for the stock bar, while the resilient ele ment L permits of arresting movement of the stock without any injury to the positively actu ated mechanism. What I claim as my invention is: 1. A feeder comprising a pair of axially recip rocatory telescopically engaged tubular mem_ 55 2 2,111,308 bers through which a stock bar is passed, a stop member and a hook or shoulder at its inner end the other resilient means for radially projecting said ?rst stop permitting of retraction of the said bifurcated portion being su?‘lciently resilient 5 same when said telescopic members are assem bled, resilient means for yieldably holding said members in extended position, and a one-way clutch carried by the forward member adapted to engage the stock and to non-positively advance the same during the forward movement of said member and to release the stock during the re turn movement. 15 inner member having a bifurcated portion for ?tting the small diameter portion of said outer on one of said members and cooperating spaced stops on the other of said members permitting a relatively axial movement of one in relation to 2. A feeder comprising a pair of axially recip rocatory telescopically engaged tubular members for engaging said shoulder of the outer member, to permit of passing said hook or shoulder through the small diameter portion of the outer mem her into engagement with the shoulder between said portion and the large diameter portion, an enlargement at the forward end of said inner 10 member, a helical spring interposed between said enlargement and the forward end of the outer member to resiliently hold said hook and shoulder in engagement, and a one-way clutch in said en larged forward end for engaging the stock to 15 through which a stock bar is passed, the outer advance the same during the forward move ment of said feeder and adapted to release it on member having portions of di?erent internal di ameters with a shoulder therebetween, and the the rearward movement thereof. SAMUEL BAXENDALE.