US2597983A

US2597983A - Rough rounding machine

Info

Publication number: US2597983A
Authority: US
Inventors: James P Fredericksen
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1949-11-08
Filing date: 1949-11-08
Publication date: 1952-05-27
Anticipated expiration: 1969-05-27

Description

y 27, 1952 J. P. FREDERICKSEN v 2,597,983

ROUGH ROUNDING MACHINE Filed Nov. 8, 1949 5* 46462 a? Z fa Rvenfor:

James P H'eaer/bksen Patented May 27, 1952 ROUGH ROUNDING. MACHINE James P. Fredericksen, Braintree,.Mass., assignor to United Shoe Machinery CorporatiomFlemington, N. J., a corporation of New Jersey Application November 8, 1949, Serial No. 126,155

8 Claims. 1

This invention relates to sole rounding, machines and, more particularly, is intended to improve the cutting action of machines of the type disclosed in United States Letters Patent 1,030,- 606, granted on June 25, 1912 upon an application of F. H. Perry. Machines of the above class, as usually constructed, are provided with a reciprocating chopping knife which makes a series of overlapping cuts through the outer sole of a shoe, along a line corresponding to the desired contour of the sole edge; preparatory to the outsole stitching and V edge trimming operations. The shoe is supported against the thrust of the knife, during this. socalledrough rounding operation, by an anvil which the-knife, when in proper adjustment, just meets at the end of its cutting stroke.

Because of the necessary bearing clearances in the knife driving mechanism and variations in thehardness of the sole material the knife may at-the end of certain strokes stop short of the anvil. At the end of other strokes the knife may slightly penetrate the anvil so as to leave a shallow trace of the knife edge in the anvil, therebyincreasing the possibility that succeeding'cuts f the knife will not extend completely through the sole. In such a case, the rough rounded sole edge will have a fringe extending from it which interferes with the proper guidance of the work during the outsole stitching and edge trimming operations. Moreover, even though the abovementioned irregularity in the stroke of the knife is hardly measurable, the anvilbecomes so worn that frequent readjustment of the knife and replacement of the anvil are necessary to insure'complete severance of the. sole.

Accordingly, one object of the inventionis to provide novel and improved knife driving mechanism, ina sole rounding machine, with a view to insuring: complete severanceof the sole materialatthe end of every cutting stroke of the knife and minimizing, as far as possible,.readjustment of the knife and replacement of the To this end, and inaccordance with one feature of -the invention, the illustrated machine includes with a carrierfortheknife, driving means which operates positively during the initial portion of the cutting stroke of the knife and until just beforeit reaches the-anvil, but thereafter. yieldingly advances the carrier to bring the knife into engagement with the anvil whereby the cutting stroke of the knife is completed. ihus, the heavier and positively applied cutting force is expended before the knife can engage the anvil,

and the knife is finally brought into engagement with the anvil, to insure a complete cut, by a yielding pressure so light that damage to the anvil or knife is avoided.

This and otherfeatures of the invention, ex emplified in the construction and arrangement of the illustrated knife driving mechanism, will now be further described in detail with reference to the accompanying drawings, and will be defined in the claims.

In the drawings,

Fig. 1 is a side elevation of a portion of an illustrative machine embodying the invention;

Fig. 2 is a sectional plan view, the section being taken at the level of the line II-II of Fig. 1; and

Fig. 3 is a perspective view of the knife carrier and its driving member, shown inexploded relation, and as viewed toward the front of themachine from theright-hand side thereof.

The drawings'illustrate a portion of the well:- known Goodyear Universal Rounding and Channeling Machine, this being the type of machine which is disclosed in the above-mentionedPerry patent. Partsof the present machine which are like the corresponding parts inthe patented machine comprise a chopping knife It, a feed point lzhaving at its lower end an anvil !4 against which the knife cuts, a bottom rest I 6 carryinga channeling knife it, a crease guide 23 and a forepart gage 22.

Further details of construction common to the present machine-and the Perry machine cause the knife ill-to be reciprocatedinto and out of engagement with the anvil l4. These parts include a rotating drive shaft 24 having a crank 26 rotatably mounted in its forward end, the axis of the crank being inclined to that of the drive shaft and intersecting it at 23. This crank'has a head 33 within which is clamped a rod 32, the rod being journaled at each end in a driving member 3 5. This driving member has upper and lower trunnions 35, 38' which are mounted to pivot freely, in a part of the frame in of the machine, about a vertical axiswhich intersectsthe axis of the drive shaft at 28. The effect of thiswellknown construction is to cause the driving-memher to oscillate horizontally through a-predetermined stroke whenthe drive shaft is rotated.

The knife is is fixed upon a carrier 42, which is mounted to slide horizontally in a slideway 44 formed in the'frame and is operated by the abovementioned driving member 34.

In prior machines of this type, such as that illustrated in the Perry patent, thedriving connection .betweenthesknife, carrier .and its driving member is positive at all times, the construction and adjustment of the machine being intended to cause the knife to be moved into engagement with the anvil at the end of each of its cutting strokes. However, in the illustrated machine, the coacting parts of the driving member and knife carrier are specially constructed, in accordance with the present invention, to cause the knife to be driven positively throughout the greater portion of its cutting stroke, and then to be yieldingly driven, through a very short terminal portion of this stroke, into engagement with the anvil. The following description will be: concerned with the structure by which this successively positive and yielding cutting action of the knife is obtained.

At the left-hand end of the driving member 34 there is formed a head 46 having forward and rearward

driving surfaces

48, 56, respectively,

which are cylindrical in form. The head 46 is received between

lugs

52, 54 having

driving surfaces

56, 58 which cooperate with the

surfaces

48, 50, respectively, on the driving member.

It will be noted with reference to Fig. 2 that the outer half of the forward side of the head 46 is recessed to provide a vertical shoulder 60, and that a similar shoulder 62 is formed on the righthand half of the lug 52. Throughout the greater portion of the strokes of the knife carrier 42 and the driving member 34 they are positively con- ;v

nected because there is only the usual small clearance between the head 46 and the

surfaces

56, 58 which is necessary for their free running. However, toward the end of the cutting stroke of the knife, when it has passed through the sole and lug 52, respectively. The head of the driv- I ing member 34 continues to move forwardly,

after the

shoulders

60, 62 have passed off each other, so as not to prevent the knife from advancing into engagement with the anvil !4 under the influence of the spring 64.

On the return stroke of the driving member 34,

the surface 50 on the head 46 bears against the lug 54 causing the knife to be drawn positively out of the work. Very soon after this return stroke starts the

shoulders

60, 62 pass. across each other causing a. completely positive connection between the head and the knife carrier to be reestablished, and this connection is maintained throughout the remainder of the return stroke and during the succeeding cutting stroke of the knife up to the time when the shoulders pass off each other again.

It is to be understood that the above described cycle of operation of the machine occurs normally at the rate of about one thousand per minute. The spring 64 is so designed as to provide sufficient driving force to insure that the knife will be driven completely through the work and yet will engage the anvil with only a light yielding pressure. Accordingly, in spite of minor variations in the relation of the parts of the knife driving mechanism, owing to bearing clearances or the resiliency of the parts, it is certain that the knife will be brought lightly into engagement with the anvil at the end of each cutting stroke, and that the complete severence of the chip from the shoe will be efiected with a minimum of wear upon the anvil and knife.

Having described my invention what I claim as new and desire to secure by Letters Patent of the United States is.

1. In a sole rounding machine having an anvil, and a chopping knife mounted to move with alternate cutting and return strokes into and out of engagement with said anvil respectively, the combination with a carrier for the knife of means for driving said carrier positively during the initial portion of the cutting action of said knife until it is about to engage said anvil, and means for thereafter driving said carrier yieldingly to bring said knife into engagement with said anvil.

2. In a sole rounding machine having an anvil, and a chopping knife mounted to move with alterhating cutting and return strokes into and out of engagement with said anvil respectively, the combination with a carrier for the knife movable toward and away from said anvil of an oscillating driving member, said member being constructed and arranged to swing out of engagement with said carrier just before said knife engages said anvil, and means connecting said driving member and said carrier for yieldingly completing the cutting stroke of said knife.

3. In a sole rounding machine, an anvil, a chopping knife, a knife carrier mounted for movement in opposite, cutting and return strokes to carry said knife into and out of engagement with said anvil respectively, a driving member normally engaging said knife carrier and mounted for movement in a direction diverging with that of the cutting stroke of said knife carrier, said member and knife carrier having driving surfaces which cooperate positively to drive the knife through the initial portion of its cutting stroke, said surfaces being arranged to pass out of engagement with each other before said knife engages said anvil, and a spring constructed and arranged to drive said knife carrier after said surfaces have been disengaged to bring said knif yieldingly into engagement with said anvil.

4. In a sole rounding machine having an anvil, and a chopping knife mounted to move with alternate cutting and return strokes toward and away from the anvil respectively, a carrier for said knife, a driving member for operating said carrier, said carrier having forward and rearward shoulders which cooperate with said driving member during the cutting and return strokes of said knife respectively, said driving member and said forward shoulder being constructed and arranged to move out of engagement with each other toward the end of the cutting stroke of the knife whereby the positive driving relation between said driving member and said forward shoulders is interrupted before said knife engages said anvil, and means for yieldingly acting upon said carrier to complete the cutting stroke of said knife.

5. In a sole rounding machine having an anvil, and a chopping knife mounted to move with alternate cutting and return strokes toward and away from the anvil respectively, a knife-carrier, a member for driving said carrier, said member and carrier having cooperating forward and rearward driving surfaces, each of said forward driving surfaces having a shoulder arranged to pass by the other toward the end of the cutting stroke of the knife whereby the positive driving relation between said member and carrier is interrupted, and a spring interposed between said member and said carrier for yieldingly completing the cutting strokeof the knife.

6. In a sole rounding machine having an anvi], and a chopping knife mounted to move with alternate cutting and return strokes into and out Of engagement with the anvil, the combination with a carrier for the knife and a member for driving said carrier of means for connecting said member and carrier positively and yieldingly in succession during each cutting stroke of the knife.

'7. In a sole rounding machine having an anvil, and a chopping knife mounted to move with alternate cutting and return strokes toward and away from the anvil, the combination with a carrier for the knife of a driving member mounted to move out of engagement with said carrier toward the end of the cutting stroke of the knife, and means for thereafter yieldingly driving the knife into engagement with the anvil.

8. In a sole rounding machine having an anvil, and a chopping knife mounted to move with alternate cutting and return strokes toward and away from the anvil, the combination with a carrier for the knife of a driving member mounted to move out of engagement with said carrier toward the end of the cutting stroke of th knife, and a spring interposed between said driving member and carrier for yieldingly completing the cutting stroke of the knife.

JAMES P. FREDERICKSEN.

REFERENCES CITED UNITED STATES PATENTS Name Date Litchfield Dec. 12, 1916 Number