US1341164A - Skiving-machine - Google Patents

Description

C. A. BLISS. smvme MACHINE. A APPLICATION FILED AUG-20, 1919. 1,341, 164;, Patented May 25, 1920.

7 3 w w G w M W MW a l.. ww fl I /H j w HY 9 3 7 9 Mm; 1 m ww w 2 5 1 7% H UNITED STATES PATENT OFFICE- CHARLES A. BLISS, OF BRADFORD, MASSACHUSETTS, ASSIGNOB TO UNITED SHOE MACHINERY CORPORATION, 01 PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SKIVING-MACHINE.

Specification of Letters Patent.

Patented May 25, 1920.

Application filed August 20, 1919. Serial No. 318,721.

To all whom it may concern:

Be it known that I, CHARLES A. Buss, a a

erating upon leather and similar material and is herein illustrated as embodied in a machine for skiving box toe and counter blanks for use in the manufacture of boots and shoes. 1

A commonly used type of machine for performing such operations comprises a bed or die roll having a cavity therein, a presser roll having a series of toothed feed disks, and a knife the edge of which is located close to and just in the rear of the bite of the rolls. Each blank is presented to the machine in timed relation to the rotation of the rolls so as to be properly received in the die cavity. The blank is forced down into the cavity by the action of the presser roll, and, as it is advanced between the rolls, those portions which project above the cavity are cut off by the knife, the shape of the finished article depending upon the shape of the cavity. I

With certain kinds of material, such as felt impregnated with a stiffening substance of a tarry nature, it is difficult to force the blank firmly into the cavity and to feed it forward without slippage. Various constructions of presser roll have been used in attempts to overcome these diiliculties, among them the roll shown in the patent to Grant, No. 887 ,625, which is composed of alternately arranged toothed and rubber collars clamped togetherupon a shaft with their peripheries substantially flush with one another. This roll, however, has certain disadvantages. First, when the sections are clamped together there is no provision for applying a uniform, limited amount of pressure to the rubber collars, with the result that the collars are compressed too much or some of them are compressed more than others and their peripheries do not form part of a common cylinder. This may be due in part to inequalities in the rubber, but in any event the peripheries of the rubber collars after they are clamped in place tend to be out of alinement with one another so that there are bulges in the periphery of the roll. Second, with the rubber collars clamped as tightly as in the patented roll, their resilience as they press upon the work is limited to a small sector. Third, when such a roll is used upon a blank which is impregnated with a tarry stiffening substance, the tarry substance sticks to and accumulates upon the rubber sections, and it is impracticable to scrape off the coating as fast as it forms since scrapers would injure the rubber.

The general object of the present invention is to overcome these difficulties as well as to provide a long-lived roll which can be used on all sorts of materials. The roll of the present invention comprises a plurality of rigid toothed sections spaced apart by hubs thereon, a plurality of rubber washers of less diameter than the toothed sections arranged alternately between the sections, a plurality of metallic rings, the diameters of which are substantially equal to those of the toothed sections, mounted on the washers, and a plurality of scrapers running in contact with the peripheries of the rings. With this construction the rubber cannot be unduly compressed nor does it come into contact with the blank. It is hence not sub jected to the influence of the tarry substance with which certain kinds of blanks are impregnated, nor is the tarry substance permitted to collect in any considerable amount upon the surface of the roll. The tendency of the iron rings to collect this substance is less than that of the rubber collars of the patented roll, and what little collects is removed by the scrapers.

These and other features of the invention including certain details of construction and combinations of parts will be described as embodied in an illustrative machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Figure 1 is a section of a portion of a skiving machine in which the present invention is embodied;

Fig. 2 is an elevation of a portion of the presser roll;

Fig. 3 is a plan of a portion of one of the combined scraping and stripping members; and

Fig. 4 is a section of the roll on the line 41 of Fig. 2 with the shaft omitted but with the combinedscraping and stripping member in position.

The illustrative machine has two rolls, a die or bed roll 5 having a die cavity 7, a presser roll9 and'a stationary knife 11 the edge ofwhich is close to and in the rear of the bite of the rolls, the rolls being driven in the directions indicated by the arrows,

and the blanks, one of which is indicated at 100, being presented to the rolls in timed relation: so asto be received properly in the cavity. The machine, as thus far described, is of a wellknown type' such, for example, as that shown in the patent to Grant referred to above, or to Lane, No. 1,173,359, and will not be described further in detail. It will'be understood, however, that each blank is'forced into the die cavity and that the knife cuts ofl those portions of the blank which project above the cavity. In the ease of box toes and counter blanks, the cavities in the die rolls commonly are deepest at their middle portions and have one or more sloping sides, so that one or more long bevels are produced on the finished articles.

With machines of this general type considerable difficulty has been experienced in pressing the blanks firmly into the cavities and feeding them to the lniife without slippage, and the present invention, as has been explained, is designed to overcome these difficulties; In the illustrative machine the shaft 13 has keyed upon it a plurality of toothed sections 150ne function of which is to feed the blank; and each section has a hub 115 which serves as a spacer so that, when the sections are clamped together between a collar 113 on one endof the shaft and a washer 16 and nut 17, the latter being threaded on the other end of the shaft, the teeth of the toothed sections are spaced apart uniformly. The spacers 115 are shown as hubs'integral with the toothed sections, but obviously whether they are integral hubs or separate members is immaterial so long as the proper spacing of the toothed sections results. Mounted on each spacer is a rubber washer 19 of a width very slightly greater than that of the spacer; and mount ed on each washer is a metallic ring 21, preferably of spring steel, the width of which is slightly less than that of the spacer. These variations in Widths are very small, that between the rings and the spacers, for example, being about .one sixty-fourth of an inch. These variations insure first that the rubber Washers shall all be compressed uniformly and to a small extent andthat the rings shall be free to yield transversely of the axis of the shaft. The diameter of the rings 2land by diameter is meant the outside diameter-is substantially the same as that of the toothed sections so that when the teeth sink into the blank the rings exert a yielding pressure upon the blank to force it into the die cavity.

A common form .of box toe blank now in use is made of felt or a felt like material impregnated with a tarry stiffening material; and, when such blanks are operated upon, the presser roll rapidly becomes coated with the stiffening material. In order to clean off any such material as well as to strip the skivingsfrom the roll, a plurality of combined stripping and scraping members- 23 are provided. Each scraper is formed at the end of an arm which projects from a hub 123 through which passes a rod 25, spacing washers, not shown, being placed between the hubs. Normally the hubs and Washers are clamped together by means of nuts 27 at each end of the red; but, by loosening the nuts, independent adjustment of the scrapers with respect to the periphery of the roll is permitted. In order to prevent displacement of the scrapers when the nuts are rotated, stationary washers are formed on thelower ends of plates 29 which are rigidly fastened to stationary brackets 31. Provision is also made for adjusting the scrapers in unison angularly about the axis of the rod 25 by manipulating screw-bolts 33, the whole mounting of the scrapers bcing substantially like the mounting of the presser fingers 14.- of the patent to Lane. Each ring 21 has a portion of reduced diameter so that grooves 35 are formed at one side of each toothed section 15 between the section and the adjacent ring 21. Each member 23 (see Fig. 8) is cut away at its operative end .to form a finger 37, which onters a groove 35, and a scraping edge 39.

which contacts with the periphery of the ad jacent ring 21. With this construction the peripheries of the rings 21 are kept clean and the skivings are stripped from the roll.

In the operation of the machine the blanks are presented one by one in timed relation so as to be properly received in the die cavity. J-is'the teeth of the sections 15 sink into the blank, the rings yield transversely of the axis of the shaft and, in connection with the toothed sections, press the blank firmly into the cavity. As the blank is fed to the knife, the projecting portions are cut off. It should be'noted that the rubber washers 19 are only slightly compressed a direction parallel to the axis of the shaft, that this compression is uniform, and

that consequently they yield uniformly throughout a comparatively large sector in response to pressure of the blank upon the rin 21. It should also be noted that the rub er is never in contact with the blank and therefore enjoys a much longer life than would otherwise be the case.

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

1. A feed and pressure roll comprising a rotary shaft, a series of rigid, toothed, spaced sections aflixed to the shaft and a series of yielding members alternating with the rigid sections, the width of the yielding members being of less extent than that of the spaces between the toothed sections.

2. A feed and pressure roll comprising a rotary shaft, a series of rigid, toothed, spaced sections afiixed to the shaft, a series of yielding members alternating with the rigid sections, the width of the yielding members being of less extent than that of the spaces between the toothed sections there being grooves between the toothe sections and the ielding members, and a plurality of combined stripping and scraping members having fingers extending into the grooves and scraping edges in contact with the peripheries of the yielding members.

3. A feed and pressure roll the operative face of which is formed by the peripheries of alternating rigid and yielding members, the rigid members having teeth adapted to enter the material to be operated upon and being spaced apart a uniform distance, the yielding members comprising elastic cushions located between the toothed members and metallic members of less width than the spaces between the toothed members mounted on the cushions.

4. A feed and pressure roll the operative face of which is formed by the peripheries of alternating rigid and yielding members, the rigid members having teeth adapted to enter the material to be operated upon and being spaced apart a uniform distance, the yielding members comprising elastic cushions located between the toothed members and metallic members of less width than the spaces between the toothed members mounted on the cushions, and scrapers in contact with the peripheries of the metallic members.

5. A feed and pressure roll comprising a shafna plurality of rigid toothed sections keyed thereon in spaced relation, a plurality of rubber washers of less diameter than the toothed sections mounted between said sections, a plurality of metallic rings the outside diameters of which are substantially equal to those of the sections mounted on the washers, and means for holding the sections, washers and rings in place.

6. A feed and pressure roll comprising a shaft, a plurality of rigid toothed sections keyed thereon in spaced relation, a plurality of rubber washers of less diameter than the toothed sections mounted between said sections, a plurality of metallic rings the outside diameters of-which are substantially equal to those of the sections mounted on the washers, means for holding the sections, washers and rings in place, and scrapers in contact with the peripheries of the rings.

7. A feed and pressure roll comprising a rotary shaft, a series of rigid, toothed, spaced sections mounted thereon, a series of rubber cushions of a width slightly greater than that of the spaces and of a diameter less than that of the toothed sections mounted between the sections, a plurality of metallic pressure members of a width less than that of the spaces mounted on the cushions, and means for clamping the rubber cushions between the toothed sections and for fastening the toothed sections to the shaft.

8. A machine of the class described having, in combination, a die roll having a cavity therein, a feed and pressure roll cooperating therewith, and a knife located in the rear of the rolls, the feed and res sure roll comprising a rotary shaft, a series of spaced serrated feed members mounted thereon, a series of presser members movable in the spaces between the serrated members, and yielding means constructed and arranged to maintain the peripheries of the presser members normally substantially flush with the points of the serrations and to permit the presser members to yield to force exerted in a direction transverse to the axis of the shaft.

9. A machine of the class described, having, in combination, a die roll having a cavity therein, a feed and pressure roll cooperating therewith, a knife located in the rear of the rolls, the feed and pressure roll comprising a rotary shaft, a series of spaced serrated feed members mounted thereon, a series of presser members movable in the spaces between the serrated members, and yielding means constructed and arranged to maintain the peripheries of the presser members normally substantially flush with the points of the serrations and to permit the presser members to yield to force exerted in a direction transverse to the axis of the shaft, and scraping means in contact with the peripheries of the presser members.

In testimony whereof I have signed my name to this specification.

CHARLES A. BLISS.

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