US2108177A - Method of and machine for trimming - Google Patents

Description

Feb., La 193g. W, H, NUN 2,105,177

METHOD OF AND MACHINE FOR TRIMMING Filed June 10, 1,955

Patented Feb. 15, 1938 UNITED STATES METHOD oF AND MAoinNE Fon TRIMMTN William H. Nutt, Beverly, lMass., assigner to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application June 10, 1935, Serial No. 25,766

16 Claims.

This invention relates to methods of, and machines for, trimming work-pieces with a skiving out, as, for example, skiving off the lumps formed on the bottom of the toe of a lasted shoe by the pleats in the overdrawn margin of upper materials rthat confront the insole. In some types of shoes adhesive cement is used not only to secure the Yoverdrawn upper materials that lie on the toes of the insoles, but also to secure the outsoles, except at the heel-seats. Consequently, to prepare a cement-lasted toe for the reception of an outsole it is necessary to trim off the lumps above mentioned, but at the same time it is also necessary to avoid trimming the overdrawn materials to a depth that would impair the strength of the connection between the upper and the insole.

This trimming operation has heretofore been `performed by feeding a lasted shoe toe-foremost to; the cutting edge of a power-driven skiving blade, in consequence of which the cutting begins outside the lumps and progresses toward the heel of the shoe, With the result that the cutter, if not quite sharp, tends to rideover the lumps instead of cutting through them. Moreover, if the initial point of attack is not positively controlled as it should be withregard to the depth of cutting, the cutting edge may beginto cut too near the'perimeter of the toe and take off more of the overdrawn upper materials than the shoe can spare.

To avoid the risks due to such conditions the present invention provides an improved method of skiving the pleats from the toe of the overdrawnVV margin of upper materials that confront the bottom of the insole of a lasted shoe, which consists in placing the unpleated portions of said margin at the sides of the bottomr of the forepart :of the shoe in face-to-face contact with an edgeforming face of a skiving element While the pleats at the toe of the shoe lie beyond'the skiving edge, 40 and moving the shoe heel-end foremost to feed kthe pleats at the toe against the skiving edge.

One advantage of such a method is that it provides for utilizing the unpleated portions` of the overdrawn margin of upper materials to insure that the, skiving cut willbe flush with the outer surface of those portions. Moreover, since the skiving begins at the inner edge of the overdrawn margin where the pleats are abrupt and progresses toward the perimeter of the toe where'no pleats exist, the skiving element, even if not quite sharp will attack the pleats with certainty and complete its cutting well inside the outer boundary of the overdrawn margin.

The invention also provides an improved trimming machine whereby shoes may be trimmed in accordance with the method above pointed out. To this end a feature of the invention consists in a trimming machine comprising a rotary driven cutting disk the diameter of which exceeds the greatest width of a shoe, the disk having an un- 5 obstructedflat face anda cutting edge thereon arranged to skive pleats from the toe of the overdrawn margin of upper materials on the `bottom of a lastedshoe fed heel-end foremost while the bottom of the forepart lies in face-toeface contact with the unobstructed flat face ofV the disk, andV work-guiding means arranged to abut one side of the forepart of a shoe so fed.

Preferably, and as herein shown, the cutting disk is annular, and its central opening is unob- 1,5 structed and of sufficient size to receive the pleated substance to be severed from a shoe. Moreover, the inner edge that defines the central opening is sharpened Ato do the cutting or skiving, While the outer Aedge of the disk has no cutting function and may be used to lmount the disk on itscarrier.

' One advantage of such a disk is that it may be very thin without being flexed by the pressure of the Work against it, since its outer margin may be amply braced by the carrier to which it is. attached. Another is that even if it is surrounded by a guard Vvisibility of its operating portion need not be obscured by the guard. Still another is thatthe interior location of its cutting edge `provides a factor of safety not only when the disk is set up for use but also when it is detached.` When it is in operation the disk, if surrounded by a guard to conne the severed substance, Will carry the severed pieces away from the point of operation and discharge them by centrifugal force only` Where the guard provides an opening for their escape.

, Referring to the drawing,

Fig. 1 isa right side elevation of a trimming machine embodying the several features of the 40 presentrinven'tion'; v

Fig. 2 is a sectional plan view of the. elements Within the range of line II-II of Fig. 1;

Fig. 3 is a vertical section on a larger scale including the rotary cutter-head, a guard. therefor and the forepart of a lasted shoe in process of being trimmed; l

Fig. 4 is a top plan View including the operating segment of the cutting disk, the toe portion of a lasted shoe and a chip or scrap of pleated material severed from the shoe and lying on the disk;

Fig. 5 is a perspective View of a segment of the cutting disk; and l Y n j.

Fig. 6 is an elevation, partly in section, includ- 55 ing means for connecting the trimming guide to the cutter guard.

The frame of the machine comprises a flat base IIB and an overhanging arm II provided with spaced bearings I2 for a vertical cutter-shaft I3, the lower portion of the frame being divided or arche-d to provide a space for an electric motor I4 that may be bolted to the base. A driving pulley I5 carried by the shaft of the motor operates a belt I6 that runs on a pulley I1 secured to the cutter-shaft i3. Intermediate portions of the belt run over a pair of idle pulleys mounted on the frame, one of the latter pulleys` being indicated at I8 and the other being coaxial therewith.

The trimming cutter is anannular sheet-steel disk 2U the diameter of which exceeds the greatest width of a shoe. When the disk is set up for use its inner an-d outer edges are concentric with its axis of rotation. The bottom face of the cutting disk is flat and its inner edge is sharpened to provide a cutting edge 2I by grinding the inner margin of the upper face. The disk is carried by a spider 22 which, as shown in Fig.'2, comprises three equally spaced arms or spokes that constitute a chuck. The hub of the spider is secured to the vertical shaft I3 as shown in Fig. 3, a set-screw 23 being provided for that purpose.

Since the flat lower face of the cutting -disk is intended to lie in face-to-face contact with the unpleated portions of the overdrawn margin 50 on the upturned bottom of a lasted shoe, to the end that it may function as a gage toinsure flush trimming of the pleats 5I, the arms of the spider 22 are provided with rabbets to receive the outer margin of the disk and form flush connections as shown in Fig. 3. At least one of the arms, but preferably each of them, is provided with an axially extending kerf 24 that intersects the rabbet therein to provi-de a resilient radially movable clamping jaw 25. A clamping screw 26 extends through this jaw and is screwed into a rigid portion 21 at the interior side of the kerf. The portions 21 provide seats for the upper surface of the cutting disk, while the resilient clamping portions 25, which extend slightly below the portions 21, are arranged to clamp the disk edgewise. Preferably the perimeter of the disk is provided with three notches, as shown in Figs. 2 and 5, to receive the jaws 25. The surfaces 28 of these notches and the clamping faces of the jaws are undercut to insure an interlocking relation and positive retention ofthe disk when the jaws 25 are set up tightly against it, and at the same time to draw the upper face of the disk firmly against the seats provided by the rigid portions 21 of the spider.

The cutter-head is surrounded by a. stationary guard 30 comprising a strip or band of sheet metal bent to provide a curved segment'and two tangent portions. The latter are secured to the frame under the arm I I by bolts'SI. The tangent portions are arranged to form a throat 52 remote from the operating locality through which severed chips may escape from the perimeter of the cutting disk and fall. The lower edge of this guard, at the front of the cutter-head, where the shoes are to be presented for trimming, is preferably slightly above the plane of the lower face of the cutter to avoid contact with the work (see Fig. 3), but at other points where there is no likelihood of interference between the guard and the work the lower edge of the guard may project to a lower level. A hole 29 in the guard (Fig. 1)

affords access to the clamping screws 26 for a screw-driver.

The guard may be braced and centered by a supporting hanger which, as shown, comprises a hub or collar 32 and two diametrically opposite arms or spokes 33 screwed into it. The collar is loosely mounted on the shaft I3 and is supported by the hub of the rotary spider 22. The outer ends of the arms 33 extend downwardly outside the guard 35 and may be aflixed thereto by rivets 31% or other means that will not obstruct rotation of the spider 22.

The guard 3Q may also be utilized to support a work guide 35 in a position to underhang the cutting disk and abut one side of the forepart of a shoe While the bottom of the shoe is held against the lower surface of the disk 20. As shown in Figs. l, 2, and 6, the work guide 35 comprises a strip of sheet-metal having a transverse bend between its ends whereby it is provided with two angularly related arms. The outer extremity of one of these arms is mortised into a kerf formed in a cylindrical pin or stem 36 and is affixed thereto as by rivets 31. The stem 33 projects upwardly through a strap or bearing 38 riveted to the outer surface of the guard 35 and may be retained therein by a Cotter-pin 39. This manner of mounting the guide 35 provides for securing it in its operative position underlying the cutting disk 23, and also provides for swinging it away from that position (see the all-dotted line position in Fig. 2) to facilitate attaching and detaching the trimming disk.

To provide for securing the guide 35 in its operative position, an angle-piece 40 (Fig. 6) is secured thereto by countersunk rivets 4I, and a complemental angle-piece 42 is secured to the outer surface of the guard 30 by rivets 43. When the guide is in its operative position, the hori- Zontal ear of the member 40 underlies and engages a horizontal ear at the lower end of the angle-piece 52. The ear of the piece 40 is bored and tapped with a screw-thread to receive the shank of a thumb-screw 44, and the complemental ear of the piece 42 is provided with a notch into which the shank of the thumb-screw may enter without detaching the thumb-screw from the piece 40. When these parts are in their cooperative relation it is only necessary to screw down the thumb-screw 44 to clamp the pieces 4D and 42 tightly one against the other.

The lasted shoe represented in Figs. l, 2, 3, and 4 is a typical example of work with which the present invention is concerned, the overdrawn margin 55 of upper materials being secured to an insole 5I in confronting relation thereto by adhesive cement at the toe-end if not also throughout the forepart and the shank portion, although, so far as the problem under consideration is concerned, other means, such as lasting staples, may be used to secure this margin elsewhere than at the toeend. In any event, the lasting of the toe-end produces pleats 5I (Fig. 4) which, after the attaching cement takes effect, must be severed substantially flush with the general plane or level of the unpleated portions of the margin adjacent thereto.

The cutter-head is preferably driven in the direction indicated by an arrow in Fig. 2 and by arrow a in Fig. 4, rather than in the opposite direction, to the end that the guide 35 will be effective to brace the shoe against lateral displace ment by the frictional drag of the cutter 20. To perform the desired trimming operation in accordance with the improved method herein set forth, the loperator will lay the -forepart of a shoe in thepalm of the left hand and grasp the counter portion with the right hand. The thumb of the yleft hand `may underlie the toe of the shoe without risk of being cut.

The operator will then thrust the shoe toeforemost under the cutter-head far enough to carry the pleated substance 5I beyond the cutting edge of the operating segment of the cutter and will then raise the shoe to place the unpleated portions of the overdrawn margin 50 in face-to-face contact with the under surface of' the cutting disk, at the same time placing the right-hand side of the forepart against the guide 35. Now, the operator moves the shoe heel-end foremost, thereby feeding the pleated substance 5l against the cutting edge 2l of the operating segment of the cutter. A movement of about one inch is usually sufficient to Aeffect the severing of all the pleated substance 5I. While the guide, 35 controls the path of lengthwise movement of the shoe, the lower surfaceA of= the trimming disk 20 controls the depth of the trimming cut, and since the trimming disk overlaps and projects beyond the unpleated portions of the overdrawn margin 50 it prevents the cutting of any substance other than the pleats and the lasting cement adhering to them.

'Ihe cutting edge first attacks the pleats at the inner edge of the margin 50 where they are abrupt and of the greatest magnitude (see Fig. 3). As the shoe is fed heel-end foremost (as indicated by arrow b) the cutter skives the pleated substance until the cutting edge runs out of the pleats well inside the outer boundary of the margin 50, as illustrated in Figs. 2 and 4.

Once a chip has been completely severed and is detached from the shoe, it is carried around with the cutting disk either by its frictional engagement therewith or by one of the arms 22 of the cutter-head, but the guard 30 is so arranged as to prevent the severed chips from being thrown out by centrifugal force until they have been carried to the rear of the cutter-head where they may escape and drop through the throat 52 (Fig. 2) bounded by the converging tangent portions of the guard.

Although the forward portion of the guard extends across the forepart of a shoe in operative position, it is s far in front of the cutting portion of the cutter that the operator may see over it to observe whether or not the pleated substance I has been located in the desired preliminary position in the central opening of the cutter before he moves the shoe heel-end foremost to effect the actual severing of that substance. Moreover, although the arms 22 of the cutter-head move across the line of vision their speed of rotation is such as to counteract their tendency to obstruct visibility of the work.

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

1. That improvement in methods of skiving the pleats from the toe of the overdrawn margin of upper materials that confront the bottom of the insole of a lasted shoe which consists in placing the unpleated portions of said margin at the sides of the bottom of the forepart in face-to-face contact with an edge-forming face of a skiving element While the pleats at the toe of the shoe lie beyond the skiving edge, and moving the shoe lengthwise heel-end foremost to feed the pleats at the toe against the skiving edge.

2. A trimming machine comprising a rotary driven cutting disk the diameter of which exceeds the greatest width of a shoe, said disk having an unobstructed iiat face and a cutting edge on 4said face arranged to skive pleats from the toe of the overdrawn margin of upper materials on the bottom of a lasted shoe fed heel-end foremost while the bottom of the forepart lies in face-to-face contact with said flat face, and work-guiding means arranged to abut one side of thevforepart of a shoe so fed.

3. A trimming machine comprising a rotary driven cutter-head provided with an annular skiving disk having an exterior work-guiding face the inner edge of which is a skiving edge arranged to operate on work fed away from the axis of r0- tation while guided by said face.

LA trimming machine comprising a rotary driven cutter-head provided with an annular skiving disk having a yflat work-engaging face the inner edge of which is a skiving edge arranged to operate on work fed away from the axis of rotation in contact with said flat-face.

5. A trimming machine comprising a driven spider arranged to rotate `about a vertical axis, and an annular skiving disk arranged below and secured to the arms of said spider, the inner edge of said disk being a sharp skiving edge and being visible through the spaces between the arms of said spider.

6. A trimming machine comprising a driven cutter-head arranged to rotate about a vertical axis, the bottom of said cutter-head being an annular disk having an interior cutting edge, and the cutter-head having openings above said disk to aiford visibility of said cutting edge from a level above the cutter-head.

7. A trimming machine comprising a driven cutter-head arranged to rotate about a vertical axis, the bottom of said cutter-head being an annular disk having an interior cutting edge, and a guard surrounding said cutter-head to provide a barrier against the broadcast of severed chips by centrifugal force from said disk.

8. A trimming machine comprising a driven spider arranged to'rotate about a vertical axis, an annular disk having an interior cutting edge, the outer margin of said disk being secured to said spider, and a stationary guard surrounding said. spider and arranged to form a barrier against the broadcast of severed chips by centrifugal force from said disk.

9. A trimming machine comprising a driven spider arranged to rotate about a vertical axis, an annular disk having an interior cutting edge, the outer margin of said disk being secured to the arms of said spider, a stationary guard surrounding said spider and arranged to form a barrier against the broadcast of severed chips by centrifugal force from said disk, said guard having an opening above said disk to alford visibility of said cutting edge, and an opening remote from the operating locality through which the severed chips may escape.

10. A trimming machine comprising a frame having an overhanging arm, a vertical cuttershaft journaled in said arm, a spider secured to said shaft below said arm, an annular cutting disk carried by said spider and having an interior cutting edge, and a stationary band having a curved segment closely surrounding a segment of said disk and alsoI having tangent portions secured to said frame and forming a throat under said arm through which severed chips may fall from the perimeter of said disk.

11. A rotary cutter-head comprising an annular cutting disk having an interior cutting edge, and a spider having jaws arranged to clamp the perimeter of said disk edgewise, at least one of said jaws being radially movable to facilitate insertion and removal of said disk.

12. A rotary cutter-head comprising an annular cutting disk and a carrier therefor, said disk having an interior cutting edge and undercut portions at its outer edge, and said carrier having undercut clamping means arranged to cooperate with said undercut portions of the disk to secure the latter.

13. A rotary cutter-head comprising an annular cutting disk having an interior cutting edge, and a spider having radially resilient jaws arranged to clamp the perimeter of said disk edgewise, the spider also having seats for the inner face of the disk to` locate the outer face thereof in ush relation to the extremities of said jaws.

14. A rotary cutter-head comprising an annular cutting disk having an interior cutting edge, and a spider having rabbets in the extremities of its arms to receive the outer margin of said disk, one or more of said arms having an axially extending kerf intersecting the rabbet therein to provi-de a radially resilient jaw arranged to clamp the disk edgewise, and means arranged to set up said resilient jaw or jaws to secure the disk in said rabbets.

15. A trimming machine comprising a arranged to rotate about a vertical axis, a cutting disk secured to the bottom of said carrier, a stationary guard arranged to confine severed chips on the upper surface of said disk, and a work-guide secured to said guard and arranged to extend under said disk.

16. A trimming machine comprising a carrier arranged to rotate about a vertical axis, a cutting disk secured to' the bottom of said carrier, a stationary guard arranged to confine severed chips on the upper surface of said disk, a workguide pivotally connected to said guard and arranged to' swing about its pivotal connection to and from its operative position under said disk, and means arranged to secure the work-guide in said operative position.

WILLIAM H. NUTT.

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