US2100342A - Nozzle for extruding machines - Google Patents

Description

Nov. 30, 193.7. w. L. MacKENzlE 2,100,342

NOZZLE FOR EXTRUDING MACHINES Original Filed Nov. 24, 1934 Patented Nov. 30, 1937 PATENT OFFICE;

NOZZLli FOR EXTRUDING MACHINES Wilbur L. MacKenzie, Beverly, Mass., assignor to United Shoe Machinery Corporation, Paterson,

N. J., a. corporation of New Jersey Original application November 24, 1934, Serial No. 754,648. Divided and this application July 11, 1936, Serial No. 90,168

23 Claims.

This invention relates to coating-applying ma- O chines, being principally concerned with nozzles for machines of the extruding type. It is herein illustrated as Yembodied in a. machine particu- Y larly adapted for applying a coatingto the bottom of a shoeprior to the application of a sole l thereto and claimed in an application for Letters Patent of the United States Serial No.

754,648, led November 24, 19514l in my name and of which this is a division. In the manufacture of compo shoes, the sole of the shoe is secured to the overlasted upper and, it may be, to other portions o'f the shoe principally byan interposed coating of adhesive which, for ease of discussion, will hereinafter be termed cement. Commonly, this cement is of the pyroxylin type, is quite viscous and tends to be quick drying, and a. marginal stripe is applied to the bottom of the shoe.N In many shoes, this stripe gg will lie upon the overlasted margin of the upper. If the compo shoes are of the welt type, then the cement will be applied to the outwardly extending welt and to the adjacent inseam or between substance. The problem of applying a coating 5 3 to the particular surfaces in question/is rendered extremely difficult bythe nature o`f those. surfaces. In' compo shoes which have no welt, the margin of the overlasted upper isv rarely fiat and in many portions is wrinkled and creased. Furgg thermore, the proiile of the bottom surface lof a shoe is not regularsand the relation of the bottom surface to other partsy of the shoe varies markedly according to the style of the shoe and .the shape of the last. If the application of cement is to the welt and inseam, asin compowelts, then the esh surface of the welt is rough, ,the inseam has many crevices and may not have been trimmed evenly, and the welt ,is flexible and frequently curves heightwise out of the plane of the 40 adjacent bottom of the'shoe.

An object of the present invention is to provide, for use,\in a coating-applying machine of the extruding type, an improved nozzle by means of which coating `material may be applied con- A tinuously and uniformly and 4may be located in the desired position upon the work.

In theillustrated machine, the nozzle is supported for heightwise yielding movement and is inclined' downwardly'and forwardly so that the o0 outlet end of the nozzleextends in fthe general direction of forwardmovement of the work and rides on the work. A feature of the invention resides in the provision, at the outlet endof a flexible nozzle, of an open-ended recess into which 55 the cement is delivered through minute passages fri (Cl. Yill-43) leading from the hollow'body portion of the nozzle. With this construction, the work presented to the nozzle does not come in contact with the open ends of the delivery passages. Conveniently, one sideof the recess is also open but is 5 closed by the contacting work thereby, forming a chamber open at the leaving end This chamber becomes lled with coating material which is, therefore, disposed upon the work in adequate quantities in a band, the sides of which are de- 'termined by lateral flanges forming the sides of the recess.

Preferably and as illustrated, the nozzle has a resilient tip` portion in which this open-ended recess is formed and, being capable of yielding 15 and twisting, may be kept in firm contact with the irregular, uneven vsurface to be coated, avoiding the danger of a lateral spreading of the coating material and assisting in leaving a deposit on the work which is of a uniform thickness.

'I'hese and other features of the invention are set forth in the following description, taken in connection with-the accompanying drawing, in which Fig. 1 is a side .elevation of a portion of a machine in which my improved nozzle has been embodied for the sake of illustration;

Fig. 2 shows, on a larger scale, the nozzle viewed inthe opposite direction from Fig. l, together with a portion of its holder; l v

Fig. 3 is a fragmentary view showing a vertical section taken substantially axially of the nome and showing the deflection of the tip of the nozzle as the work is brought into contact with it;

Fig. 41s an enlarged angular view of the tip 35 of a nozzle designed particularly for the bottoms v of shoes which have no welts;

Fig. 5 is an enlarged sectionthrough the end of a nozzle such as is shown in Fig. 4 but in inverted position and on a much larger scale? Fig. 6 is a longitudinal section with a modified nozzle, and .I v

Fig. 7 is an enlarged angular 'view of the tip of the nozzle shown with the recess facing up.

In general, the machine comprises a nozzle I0 through which a coating material, such as cement, is supplied undef-pressure. The cement is fed to the nozzle through a flexible hose I2 leading to pipe fittings i4 to which is fastened a pressure lgage i6 and which embody a turn valve. 50 Associated with the nozzle is a rubber-tired-feed wheel 20 which-is movably mounted on a carrier 22 supportedin a hollow frame 24, only one side of which is shown in Fig. 1. The arrangement is Such that an operator holding a sh S ininverted, substantially horizontal position presents that portion of the bottom of the shoe adjacent to the heel-breast line to the nozzle I 8, and by depressing a suitable treadle (not shown) moves the feed wheel 20 into the position shown in Fig.

1 where the wheel is in contact with the side of the shoe, and also opens the valve I8 to allow a flow of cement through the nozzle. The rotation of the driven feed wheel 20 causes a progressive movement of the shoe which is guided by the operator to present to the nozzle the margin of the bottom of the shoe around the toe end thereof back to a corresponding point 'on the other. side of the shoe with the result that there is applied a marginal band of cement to the overlasted upper 26. The machine may also be used for shoes having a welt W, as shown in Fig. 3, and, when thus employed, the machine will include a welt-supporting member 28.

Mounted inthe frame 24 is a nozzle-supporting lever 30 having a depending rear end 32 carried on a cross pivot 34. Upward tilting movement of the nozzle-supporting lever 30 is opposed by a spring 36 interposed between a4 lug .'18 on the lever and a fixed lug 48 on the frame. The normal lowermost position of the' lever is determined by means of a screw 42 threaded in a ange 44 on the lever and contacting with a flange 46 on the 'side of the frame.

The nozzle I0 is held on the lower end of an arm 50 by means of a clamp plate 52 and this arm is held in the desired angular position on a supporting rod 54 attached to the lever 38 by means of pinch screws 56 passing through a split portion of the arm. The rod 54 is mounted for axial adjustment in the outer end of the lever 30, being guided by the pointed end of aset screw 58 which cooperates with a V-shaped groove 60 in the rod and which, when screwed' down, serves to clamp the rod against both axial and turning movement.

The feed roll 20 mounted in the pivoted carrier 22 is driven by means of interconnected shafts 62 and is moved outwardly by the oper-V ator until an arm^64 on the carrier 22 engages the inturned end 66 of an adjustably mounted stop bar 68. Opening and closing of the valve I8 is effected by actuation of a valve rod 'I0 journaled in a bracket I2 which is apart of 'the carrier lever 30. This valve rod 'I0 is connected to the valve I8 through universal joints 141 so that the actuation of the valve is not affected by adjustments of the position of the nozzle-carrying arm 50. Turning movement of the valve rod 10 is secured by pulling a rod I6 attached to a lever 'I8 which is secured to the valve rod. It is desired that the feed roll shall be moved out into I position before the valve is opened and vice versa,

carrier 22 into the hollow frame of the, machine when the treadle attached to the treadle rod is no longer depressed. y

It will be understood that a nozzle of this type is subjected to repeated distortions as successive shoes are presented to the nozzle, and during thev traversing movement of a single shoe, it is flexed up and down and sidewise because of the uneven character of the bottom of a shoe, in which the shank portion is not in the same plane as the forepat and is connected to the forepart by a,

portion of double curvature adjacent to the ball line. In order that the nozzle may not be unduly` distorted, and to facilitate its movement over the work and retention in the desired position on the work, there may be associated with the nozzle askid finger 90, best shown in Fig. 1, which takes from the nozzle the shock of riding over heightwise irregularities and also limitsfthe upward pressure which the operator may apply to the nozzle. At the shank portions of shoes,l such as the shank portion of the shoe S illustrated in.

pends to a considerable degree on the construction of the nozzle I6. The work to be coated is of irregular contour bothlaterallyand heightwise of the shoe and provides a relatively rough surface to which cement may be applied uniformly only with considerable difficulty. For such work, the improved construction herein shown and described provides a nozzle which may be made of relatively. flexible material, such as soft rubber, and by means of which a controllable quantity of cement may be applied with great regularity and in a uniform manner. This nozzle comprises a hollow body portion Il- (Fig. 3) having a large passage |02 which receives a tubular extension, |04 extending downwardly from the bottom of a plate |06 (Fig. 1) and at an acute angle thereto; The flattened end of the nozzle is reduced in thickness as at Hi8 (Fig. 3) and slightlyyin width (Figs. 1 and 2) so that it may be exed from a position in which it lies substantially symmetrical with respect to the center plane of the body IIlIJ to a position, such as is shown in Figs. 2 and 3, in which the tip III) is bent at a decided angle to the body EM. This tip III) is provided with a substantially U-shaped, open-sided, open-ended recess H2 defined laterally by the inner faces II4 (Figs. 4 and 7) of side flanges II6 and by an inner, end surface IIB (Fig. 4). The open side of the recess is positioned adjacent to the work and as the work travels with respect to the nozzle, the direction of feeding movement is away from the open end of the recess so that the recess is open at the forward end of the nozzle tip, thereby permitting the deposition of a band of cement. Depending on the quantity of cement extruded, as determined by the pressure applied, this will leave parallel stripes or a single band' of cement of uniform character, the width of which will be determined by the space between the side anges H6. Minute passages 28 lead from the interior of the body portion to the inner corner of this recess. These passages are preferably of such a size that they are capillary and, therefore, function like the capillary tubes employed in the nozzle shown in an application" for Letters Patent of the United States No. 2,058,461, granted October 2'1, 1936, on the application of Joseph W. Johnson, for improvements in Nozzles for machines for preparing soles for cement shoes. Conveniently, the nozzle is constructed by molding and when this is done, a core (not shown) f which forms the large passage |02 may carry a ,series of six-sided rods (not shown) having a cross-sectional shape like that of the passages |20, shown much enlarged in Fig. 5.. Conveniently, too, these rods are extended to the extreme end ofthe nozzle and two sides of each rod are utilized to form V-shaped grooves |22 separated by V-shaped ribs |24. In the use of the nozzle, these ribs |24 rest on the work, as indicated in Figs. 2 and 3, and prevent the open end of the recess ||2 from being closed by the pressure of the work against the nozzle.` 'Ihe tip of the nozzle serves also as a wiper or spreader by which the applied coating is rubbed into the Workand evenly distributed in the direction of the length of the applied band. Preferably, the spacing -of the V-shaped ribs is such( that the grooves formed therebetween will be completely lled with cement at the particular pressure applied, thus insuring a good contact of the cement with the work without too much pressure by the nozzle on the work. It has been found that too wide a spacing of these ribs tends to produce stripes of cement on the work, which stripes, though they may be very slightly separated when originally'applied, are of suillcient body so that they tend to shrink away from each other and to leave markedly separated stripes, a condition which is not usually` desirable. A spacing between the ribs of one-sixteenth to one-twentieth of an inch has been found to be suitable. 'I'he nozzle rests on the work at a point onthe nozzle which,

. for convenience, will `be termed the heel |26 (Figs. 3 and 7) of the nozzle and at its extreme tip |28. There is, accordingly, opportunity for the cement to completely surround the ribs |24 at the inner part of the recess ||2 and thus to lubricate these ribs to such an extent that wear on 'them is greatly reduced. l

To secure adequate contact between the tip of the nozzle andthe work, the tip is provided n its upper face with a series of parallel reinforcing ribs |30 (Figs. 2 and 4). When the nozzle is to be used for welt cementing, as in Fig. 3, these ribs extend as such all the way to the end of the nozzle. It is sometimes found desirable for this kind of work also to reduce Vthe `depth of the end portions of the side ilanges IIS and, if it is desired to have a band of cement of uniform thickness, also to chanifer the end portions of the ribs |24. This construction is shown in Fig. 6, where similar parts are indicated by similar numerals to which 1000 has been added. On the other hand, if the nozzle is to be used for shoe bottoms of compo shoes S of the type illustrated in Figs. 1 and 2, then it is found desirable to interconnect the ribs |30 by f means of a transverse rib |32 (see also Fig. 4)

formed integrally with the tip of the nozzle to prevent undue distortion and to keep the V ribs |24 near the center of the outlet end of the recess from being pressed so ilrmly against the Work as to divide the resulting band of cement into spaced parallel stripes, for example.

The spreader action of the-tip of the nozzle has been found to be of considerable advantage in the elimination of bubbles in certain types of work. The reason for these bubbles is not fully bubble. Such bubbles either harden as protrud- This air may ing lumps or else burst and form distinct crater rims which protrude from the work and are a hindrance in securing perfect adhesion between the shoe parts. Whatever the explanationmay be, they are definitely eliminated by the spread-` ing or wiping action of the tip of the nozzle as the V ribs |24 therein are dragged through the applied coating. Many manufacturers desire that the coating shall be of full thickness at the outer-edge of theworkso that there shall be no doubt that perfect adhesion is secured at this point. If the sole adheres to the shoe along the outer margin of the applied band of cement,

then a satisfactory job results. If there is any ment to the margin of a shoe which will be of, -full thickness at the outer edge without being so thick as to cause squeeze-out and the conse- ,que'nt danger of soiling the upper.' 'Ihe nozzle construction appeals to operators as no time is required for cleaning the machine when it is left for the night. It is simply necessary to smear a quantity of cement over the recessed end of the nozzle and to allow it to harden thereon, preventing any cement in the passages of the nozzle from drying out. -When the machine is'again desired for use, the operator needs only to distort the tip of the nozzle, breaking away the hardened cement and leaving the nozzle in condition for immediate use.

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

1. A nozzle past which a piece of work may be movedv and comprising a hollow body portion and a resilient tip portio'n having a lateral recess open at the side and at the leaving end of the tip portion, and passages opening in the inside of said hollow body portion and extending along said tz'p portion, the end portions of said passages opening laterally of said tip in said recess.

2. A nozzle in contact with the side face of the tip of which a piece of work may be moved and comprising a hollow body portion, a tip portion of conformable material provided with a lateral recess having that side which is adjacent to the work open, said recess being also open at the leaving end, and passages interconnecting the hollow body portion and said recess.

3. A nozzle having a flattened flexible tip portion provided with an outlet opening in a side face of said tip portion and adapted to be deflected by pressure against a piece of work, and means acting directly on said ilexible tip portion to resist excess ilexure thereof by a piece of Work with which the nozzle may be in contact.

4. A nozzle having a attened -exible tip portion provided with an outlet opening and adapted to be deflected by pressure against a piece of vwork, and means arranged to act directly on said flexible tip portion to resist excess dleilection as the work reacts with the tip portion, said tip portion having parallel ribs extending along the work-contacting face of said tip.

5. In an extruding machine, a nozzle of flexible material comprising a hollow body portion and a flattened tip portion of reduced thickness hav-V ing an outlet opening in one side thereof, minute passages interconnecting the inside of the body portion with the outlet opening, and resilient means acting directly on the tip portion to resist excess deection by a piece of work presented to said tip portion adjacent to said outlet opening and hence to hold the tip portion against the work.

6. In an extruding machine, a nozzle having a hollow body portion and provided with a resilient tip having an outlet opening, said nozzle also hav-A ing a passage connecting the inside of said body portion with said outlet opening, and resilient ribs on the side of said tip away from its workengaging face to assist in holding the tip in rm contact with the work while permitting deflection of the tip.

7. In an extruding machine, a nozzle of flexible material past which a piece of work may be moved and comprising a hollow body portion and a workcontacting tip portion, and resilient means acting directly on said tip portion rfor resisting the pressure of the work, the work-contacting surface of said tip portion being provided with` a recess open at its leaving end. there being minute passages connecting the inside of said body portion with said recess.

8. A nozzle constructed of resilient material comprising a hollow body portion and a flattened tip portion of reduced thickness havingy a recess' bounded by lateral ribs, said lnozzle being provided with passages extending from said body portion and emerging in a broad side of said tip portion Within said recess.

9. A nozzle constructed of resilient material comprising a hollow body portion and a tip portion of reduced thickness, said nozzle being provided with passages extending from said body portion and emerging at one side of said tip portion and with ribs along 'the tip near the point 'where the passages emerge.

10. A nozzle constructed of resilient material comprising a hollow body portion and a tip por- -tion of reduced thickness, said nozzle being provided with passages extending from said body portion and emerging at one side of said tip portion and with ribs along the side of the tip portion opposite to that from which the passages emerge.

11. A nozzle constructed of resilient material comprising a hollow body portion and a tip portion of reduced thickness, said nozzle being pro.- vided with passages extending from said body portion and emerging at one side of said tip portion and with ribs along the side of the tip portion opposite to that from which the passages emerge, said ribs being interconnected by a rib extending transversely thereto.

12. A nozzle constructed of resilient material and comprising a hollow body portion and a tip portion of reduced thickness. said nozzle being provided with passages extending from said body portion and emerging at one side of said tip portion, the work-engaging side of the tip portion being provided with grooves in line with said passages.

13. In an extruding machine, a nozzle adapted to rest on the work and having a minute passage, said nozzle having at its work-contacting side a recess an open side of which faces the work, said recess having also an open leaving end, the outlet end of said passage being positioned at the inner corner of said recess.

14. In an extruding machine, a nozzle having a minute passage, said nozzle having at its workcontacting side an open-ended recess, the outlet end of said passage being positioned at the. inner corner of said recess, and spaced ribs extending along a face of said recess thereby to provide a groove between the ribs communicating with the outlet end of the passage and extending in the direction of relative movement between the nozzle and the work.

15. In an extruding machine, a nozzle having a hollow body portion and a resilient tip, the workcontacting side of said tip being provided with a recess bounded by lateral flanges and a heel, all

of which are adapted to rest against the work to prevent extrusion of the cement laterally or toward the rear, the top surface of the recess between said flanges being provided with ribs which at the inner end of the recess are of less height than the portion of the lateral ange opposite thereto, said ribs being adapted to contact with the work at the leaving end of the nozzle after having been lubricated by the cement covering the ribs at the rear of the recess, there being passages interconnecting the hollow body portion with said recess.

16. In an extruding machine, a nozzle having a hollow body portion and a resilient tip, the work-contacting side of said tip being provided with a recess bounded by lateral flanges, and ribs of less depth than the flanges disposed along the top of the recess between said anges thereby to form a series of grooves extending in the direction of relative movement between the nozzle and the work, said nozzle having passages interconnecting the inside of said body portion with said recess.

17. In an extruding machine, a nozzle having a hollow body portion and provided with a resilient tip having an outlet opening, and resilient ribs on the upper side of said tip permitting deiiection of the tip while holding it in rm contact with the work, said ribs being interconnected by a transverse rib adjacent to the trailing end of the ribs.

18. A nozzle adapted to rest on the work and having a passage terminating in an outlet opening and comprising a exible spreader adapted to rest on the work forwardly of the nozzle, said nozzle having a heel portion adapted for contact with the work to the rear of the spreader and constructed and arranged to hold the outlet opening away from the Work, the nozzle also having two sides to limit lateral spread of the extruded material.

19. A nozzle having a tip portion adapted to rest on the work and having a passage terminating in an outlet opening spaced inwardly from the work-contacting surface of the nozzle, said nozzle also comprising a flexible spreader adapted to rest on the coated portion of the work and provided with a surface having a plurality of parallel ribs which are effective in preventing the spreader from wiping coating material from the surface of the work.

20. In an extruding machine, a nozzle having a heel for contact withthe work as relative movement is produced between' the nozzle and the work to apply a band of coating material, said nozzle having a passage terminating in an outlet opening which is spaced from the heel thereby to avoid closing of the outlet opening by pressure of work against the nozzle and comprising a exible spreader constructed and arranged to be deflected by a piece of workl presented to the nozzle and provided with ribs extending lengthwise thereof to rest on the surface of the work at the y the level of the heel thereby to `avoid closing of the outlet opening by p'ressure of work against uthe nozzle and comprising a exible spreader associated with the nozzle and constructed and arranged to be deected by a piece of work presented to the nozzle and to rest on the surface of the work at the forward side of the nozzle, said spreader being provided with a grooved surface to prevent the spreader from wiping coating material from the surface of the work.

22. In an extruding machine, a depending nozzle having a heel for contact with the work as' relative movement is` produced between the nozzle and the work to apply a band of coating material, said nozzle having a passage terminating in an outlet opening which is at a level above the level of the heel Athereby to avoid closing of the outlet opening by pressure of work against the,

nozzle, and comprising a resilient spreader associated with the nozzle constructed and arranged to be deiiected by a piece of work presented to the nozzle and to rest on the surface oi' the work at the forward side of the nozzle, said spreader having a grooved portion the lateral edges of which bear on the work thereoy to determine the lateral extent of the band of coating material which is deposited on the work.

723. In an extruding machine, a depending nozzle having a heel for contact with the work as relative movement is produced between the nozzle and the work to apply a band of coating material, saidlnozzle having a passage terminating in an outlet opening which is at a level above the level of the heel thereby to avoid closing of the outlet opening by pressure of work against the nozzle. and comprising a resilient spreader constructed and arranged to be deected by a piece of work presented to the nozzle and to rest on the surface of the work at the forward side o! the nozzle, said spreader having a grooved portion the lateral edges of which bear on the work thereby to determine the lateral extent of the band of coating material which is deposited on the work, said grooved portion being provided with ribs extending in the direction of relative movement.

WmBUR L. MACKENZIE.

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