US2064932A - Coating applying machine - Google Patents

Description

M. 22, 1936. w. L. MacKENZIE 2,064,932

COATING APPLYING MACHINE Filed Nov. 26, 1934 I 1 106 /Vl/[/V TUF ilk [04,64 A W Patented Dec. 2 2, 1936 UNITED STATES PATENT OFFICE COATING APPLYING MACHINE Application November 26, 1934, Serial No. 754,894

6 Claims.

This invention relates to coating applying machines and is herein illustrated as embodied in a machine of the type in which the coating is extruded through a nozzle upon the work.

In the application of coatings, especially coatings in the forms of bands or stripes, to pieces of work, such as shoe parts, it has been found to be advantageous to apply the coatings by means of a nozzle having one or more minute passages 10. which usually are of such dimensions that they form capillary tubes and through which the coating material is extruded under pressure. With some types of work, such as soles, shoe bottoms and the like, it is found that a more perfect application of coating material may be secured by providing a spreader which is associated with the nozzle and arranged to drag upon the coated surface of the work thereby to even out the applied coating as relative movement is produced between the nozzle and the work.

One object of the invention is to provide an improved nozzle embodying a spreader by means of which a more perfect and uniform application of cement may be made. A feature of the invention resides in the provision of a spreader strip which is illustrated as a long thin strip of rubber and which is clamped against the forward side of the nozzle in such a position that its lower end normally hangs below the work contacting end of the nozzle. When a piece of work is applied to the nozzle, for example, this depending end is deflected and drags over the coated surface. Also as illustrated, the spreader strip is clamped against the nozzle by readily releasable means so that, when the end portion becomes worn or bears hardened coating material, the strip may be lowered and the worn out portion readily cut off. The invention, the work contacting surface of the illustrated spreader strips is ribbed so that, as it drags upon the work, the thickness of the applied coating will not be changed as no coating material is removed by the strip but is simply spread along the work in the direction of the applied band and the coating thereby rendered more uniform. In one illustrated form of the invention, the outlet openings of the nozzle are in the forward side and the truding machine including a nozzle embodying my invention;

Fig. 2 is an end elevation of a portion of the same machine;

Fig. 3 is a vertical section through the applying nozzle and its carrier in a plane parallel to the direction of feeding movement;

Fig. 4 is a horizontal section, much enlarged, on the line IV-IV of Fig. 2 of a fragment of the applying nozzle and spreader strip, and showing how the spreader strip closes the nozzle apertures when no work is applied;

Fig. 5 'is a fragmentary side elevation to show the nozzle and a feed wheel in operative relation to a shoe;

Fig. 6 is a detail elevation of the support for a roll of spreader strip material;

Fig. '7 is a vertical section taken in substantially the same position as Fig. 3 through a modified form of the nozzle, and

Fig. 8 is a detail in vertical section through the strip clamp of Fig. '7 looking toward the adjacent nozzle and shows the points where the passages emerge into grooves at the bottom of the nozzle.

To facilitate an understanding of the utility of the particular nozzle which forms the subject of my invention, I have herein shown the nozzle as applied to an extruding machine designed particularly for the application of a band of cement to the bottom of a shoe preparatory to the attachment of a sole by means of the cement. Such a machine is the subject of an application Serial No. 754,648, filed November 24, 1934, in my name and relating to improvements in Shoe bottom coating machines. It will be understood, however, that the nozzles herein described and claimed'are not limited in use to that particular machine but may be employed for various types of work and in various machines. This particular extruding machine embodies a frame l0 having spaced frame members l2 and I 4 (Fig. 2) within which is movably supported a carrier l6 (Fig. 1) for a driven feed wheel l8 adapted to engage the side of a shoe S, shown in section in Fig. 5. This feed wheel is arranged to be moved outwardly into engagement with the side of a shoe under the control of the operator by a treadle mechanism (not shown) and, when in operative position, further outward movement is prevented by the engagement of a projection 20 on the carrier IS with a stop member 22 carried by the frame piece l4. At the upper portion of this machine, there is tiltably supported an arm 24 which is pivoted near the right side of the machine, as viewed in Fig. 1, and is provided at its outer end with a rod 26 upon which a nozzle N is supported.

At the end of this rod, I have provided a nozzle carrier 36 (Fig. 2) clamped to the rod 26 by means of pinch screws 32. The rod itself is held in the arm and prevented from twisting by means of a set screw 34 and the lowermost position of the tiltable arm is determined by an adjustable hand screw 36. The nozzle N is secured to the under side of the carrier 36 in such a way that its hollow body portion 38 (Fig. 3) communicates with a passage 46 extending through the carrier and opening into a pipe connection 42 in which there is a turn valve 44 (Figs. 1 and 2). Coating material is supplied to the nozzle through a flexible hose 46 connected to this valve 44 by a tee 48 on which is mounted a gage 56 for indicating the pressure applied to the coating material. The coating material is forced from a supply tank (not shown) by means of a pump (not shown) connected to the flexible hose 46 and this tank is filled from a supply can 52. Actuation of the valve 44 is effected by a treadle (not shown) connected to the valve by means of a rod 54. Universal joints 56 are included in the rod 54 so that up and down movement of the nozzle with the pivoted arm 24 is not interfered with by the valve actuating rod.

It will be seen from Figs. 3 and 4 that the vertical face on the leaving side of the nozzle is corrugated to provide a series of grooves 66 with intervening ribs. Minute or capillary passages 62 lead from the hollow body portion 38 to the crests of the ribs between the grooves 66 and through these passages the coating material is extruded. The bottom of the nozzle is beveled to provide a tip 64 adapted to rest on a piece of work, such as the shoe S, held up in contact with the nozzle and the passages 62 emerge in the leaving side of the nozzle at a point slightly above the work contacting end of the tip 64.

In spite of the fact that a nozzle constructed with capillary passages as above described is enabled to extrude predetermined quantities of coating material per unit of time and in spite of the I fact that the driven feed wheel l8 moves the work along at a uniform rate, it is sometimes found desirable to even the applied band of cement in the direction of its length. This need is largely a result of the character of the work. For example, while the shoe S, a portion of which has been shown here for the sake of illustration, appears in the drawing to be substantially plane on the surface to be coated, it is found actually to be fllled with ridges and valleys, folds of the upper leather and frequently will embody projecting metallic fasteners, such as tacks or staples. It being impossible for the nozzle to always fill every one of these irregularities, it has been found desirable to provide a flexible spreader strip I6, one end of which will normally hang below the end of the nozzle, as indicated in Fig. 2, but which will be deflected to the position indicated in Fig. 3 when relative movement between the nozzle and a piece of work is produced, as by moving the work in the direction of the arrow. This spreader strip may be constructed of leather, rubber or the like and, in addition to being flexible, is preferably made resilient so that it will spring back into position alongside the nozzle after the work has been removed. The strip is thin in the direction of relative movement between the nozzle and the work and in proportion to its width and, thus, is readily deflected. Some of the coating material extruded through the passages 62 will drop directly on to the work while some of it will flow along the work contacting face of the spreader strip I6. Preferably, this work contacting face of the strip is provided with ribs I2, shown much enlarged in Fig. 4, and with grooves I3. These ribs I2 rest upon the overlasted upper u of the shoe S. Such a ribbed surface on the spreader strip I6 provides a more perfect evening of the coating material than would a plane surfaced strip, as it tends to prevent lateral spreading of the coating material and avoids wiping off any of the coating material. Conveniently, the ribs I2 on the spreader strip may be made complementary to the grooves 66 on the face of the nozzle and the spreader strip may be made of resilient material, such as soft rubber. Consequently, when the spreader strip springs back into its normal position, illustrated in Fig. 2, it will tend to close the passages 62, thereby to keep the coating material from becoming hardened. "When the strip is deflected, as in Fig. 3, the coating material runs down the grooves I3 and is more surely conducted to just the desired location upon the work. Such a soft rubber spreader strip may conveniently be provided in a long piece, shown as mounted on a reel 86 (Fig. 2) carried on a bracket 82 bolted to an outward extension 84 of the nozzle carrier 36. Provision is made, as shown in Fig. 6, for

resisting too free turning movement of the reel and comprising a spring 86 bearing against the reel and applying a pressure regulated by nuts 88. This spreader strip passes through a slot 89 in the carrier 36 and is releasably held between the ends of the strip against the upright face of the nozzle by a U-shaped clamping member 96 having side flanges 94, and pivotally mounted upon the lower arm of a bell crank 96. These side flanges cooperate with the nozzle and the clamp to prevent lateral movement of the strip. The pressure of a. spring 98 upon the bell crank urges the clamping member 96 into contact with the strip. A finger piece I66 formed at the upper end of the bell crank enables the operator to release the clamp 96 whenever it is desired to provide a fresh portion of the strip. In the course of time, the ribs I2 on the active end of the strip will become worn and it may be that, through carelessness, the coating material will have hardened upon the lower end of the strip. If, then, it is desired to remove this work contacting portion, it is only necessary for the operator to raise the finger piece I66 thereby releasing the clamp 96 and to draw down a fresh portion of the spreader strip from the reel 86, cutting off the used portion.

A modified nozzle N is shown in Figs. 7 and 8, which differs chiefly from the nozzle already described in the construction of the work engaging end I64. This is provided with a series of ribs I62 on the work contacting end between intervening grooves or recesses into which open passages I64 leading from the hollow body portion I66 of the nozzle. Upward pressure of the work against the lower end I64 can never close these passages I64, therefore, and the coating material will be applied in closely related stripes which will be smoothed out and caused to merge, in most cases, by the work contacting end II of the spreader strip I6. The grooves between the ribs I62 at the lower end I64 register with other grooves on the vertical face of the nozzle like those indicated at 66 in Fig. 4.

Inthe use of the machine, coating material supplied to the nozzle N under pressure from the the lower end of the nozzle. The shoe will be guided by the operator so that the entire marginal portion of the shoe bottom, or such part of it as may be desired, receives a band of coating material. This band will be rendered even more uniform than would otherwise be the case by the action of the spreader strip 10.

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

1. In an extruding machine, a depending nozzle having grooves in its work contacting end extending in the direction of relative movement between the nozzle and a piece of work presented thereto, minute passages extending from the interior of the nozzle to approximately the bottoms of said grooves, and a flexible ribbed spreader associated with said nozzle and adapted to be deflected by a piece of work and to bear upon the coated surface of the work as relative movement between the work and the nozzle is produced.

2. In an extruding machine, a nozzle having a recessed end portion adapted to be positioned near the work, a passage through said nozzle having an outlet opening within the recessed end portion, a ribbed vertically elongated flexible spreader strip associated with said nozzle normally extending beyond the outlet end of the nozzle and adapted to be deflected by contact with a piece of work presented to the nozzle, and readily releasable means engaging said spreader strip at a point between its ends to clamp it to said nozzle, said stirp being much longer than the distance between the clamp and the outlet end of the nozzle whereby'fresh portions of the strip may readily be brought into operative position.

3. In an extruding machine, a depending nozzle having a hollow body portion connected to the forward side surface of the nozzle by one or more passages, said forward side surface having a plurality of grooves extending heightwise of the nozzle, and a ribbed spreader strip the surface of which is complementary to the surface of the nozzle and clamped against said forward side thereby to seal said passages when no work is present and to be deflected by the work to open the passages and to bear upon the coating applied by the nozzle, as relative movement is produced between the work and the nozzle.

4. In an extruding machine, a depending nozzle having a work contacting end portion, a hollow body portion, the forward side surface of said nozzle being provided with a plurality of grooves with intervening ribs, and a resilient spreader strip clamped against said side surface at a point removed from the work, said nozzle having passages extending from the hollow body portion to the forward side surface and opening at the top of the ribs between said grooves adjacent to the lower end of the nozzle, said resilient spreader strip having a ribbed surface complementary to the grooved surface of the nozzle and extending below the end of the nozzle whereby said passages are sealed by the spreader strip when no work is present and are opened by the deflection of the lower end of the strip when a piece of work and the end of the nozzle are brought into contact.

5. In an extruding machine, a nozzle having an end portion provided with a discharge opening adapted to be positioned near the work, means forsupporting a supply of surplus flexible spreader strip material on said machine, said strip extending below the outlet end of said nozzle, and

, means for releasably clamping said strip material at a point between its ends to the end portion of said nozzle.

6. In an extruding machine, a nozzle having an end portion provided with a discharge opening adapted to be positioned near the work, a rotatable member supporting a supply of surplus flexible spreader strip material on said machine, said strip extending below the outlet end of said nozzle, and means for releasably clamping said strip material at a point between its ends to the end portion of said nozzle.

WILBUR L. MACKENZIE.

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