US2028535A - Thermostatic wax pot - Google Patents

Description

Jan. 21, 1936. 5 Dow 2,028,535

THERMOSTAT I C WAX POT Original Filed Nov. 16, 1929 Patented Jan. 21, 1936 THERMOSTATIC' WAX POT Harry E. Dow, Beverly, Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Original application November 16, 1929, Serial Divided and this application 00- tober 4, 1933, Serial No. 692,119

6 Claims.

The present invention has relation to wax pots, such as are used in connection with wax thread sewing machines for impregnating the thread with liquid wax just prior to the incorporation of the thread in the seam being formed by the sewing machine. more particularly to wax pots wherein the wax is maintained in molten condition and at a proper temperature for thoroughly permeating the thread by means of electrical heating devices.

The invention has as its object the provision of a novel and. improved wax pot having advantages over prior constructions through providing a receptacle for the wax which shall be quickly and easily removable from its supporting means, leaving behind and without disturbing the thread guiding and stripping devices so that it may be entirely separated from the rest of the wax pot for the cleaning-out that is necessary at frequent intervals, and also so that easy access may be had, without soiling the operators fingers, to the thread guide which leads the thread into and through the liquid wax.

To these ends, the invention consists in a wax pot having a supporting bracket, a receptacle for the Wax supported thereby with capacity for easy removal, and the provision therein of novel and. improved means for effecting and regulating the stripping of the excess wax from the thread as it is drawn out of the liquid wax. The manner in which this is accomplished, as well as other features of the invention and their advantages, and the means whereby they are attained, will be apparent to those skilled in the art from the following description and the claims appended hereto taken in connection with the accompanying drawing showing the illustrated embodiment of the invention in its preferred form.

In the drawing, Fig. 1 is an elevation and Fig. 2 a plan of the improved wax pot; Fig. 3. is a side View of the head of the bracket with the receptacle for the wax and its cover removed, showing the thread guiding and stripping means; Fig. 4 is a partial plan view, in section on line 4-4 of Fig. 1, looking in the direction of the arrow; and Fig. 5 is a perspective view of one of the spring-blades of the stripping devices.

The improved wax pot is designed to be mounted in appropriate position upon the pedestal or other portion of the frame of a wax thread sewing machine by means of a bracket 2 provided with eyes 4 through which attaching The invention relates screws 6 may extend into such pedestal or framework. The bracket 2 is formed of aluminum, as are all the other main parts entering into the construction of the wax pot, in order to secure maximum diffusion of heat. A bore 8 is formed within the center of the relatively thick bracket to receive an electric heating unit of well known cylindrical shape and familiar construction. This heating unit is controlled by a thermostat of well known type adapted to interrupt or reinstate the flow of electrical current according to the changes of its temperature, and is mounted within an appropriate cup-shaped housing It) formed upon one face of the bracket 2. The thermostat and its connections are enclosed and protected by a cover [2 whichis secured to the bracket by means of a screw M.

The wax is put into a receptacle I6 also of aluminum, which is fitted to the opposite surface of the bracket 2 by means of a dove-tailed tongue-and-groove joint, the tongue being formed as indicated at i8, upon the material of the side of the bracket closelyadjacent the bore 8 within which is the heating unit. The corresponding groove is formed in the material of the receptacle l6 and the adjoining surface of both the bracket and the receptacle are machined to fit closely against each other at and about the tongue so that there will be efficient transfer of heat from the bracket to the material of the receptacle, to heat the latter and melt the wax placed therein. While permitting free transfer of heating across the joint from the bracket to the receptacle, the fit is such as to permit easy sliding movement of the receptacle up into working position along the tongue l8, and down and off from the bracket to permit removal of the receptacle for cleaning. The construction is! such that dirt and other foreign matter will not accumulate and prevent the receptacle entering into close heat-transmitting contact with the bracket. The receptacle is maintained in working relation with the bracket by means of a catch formed by a bolt 20 mounted in an extension 22 from the receptacle l8 and pressed by a spring 25 into a recess in the edge of the bracket, the bolt registering with the recess when the receptacle has been slid upward into proper position. A knob 26 upon the bolt facilitates its manipulation when it is to be withdrawn to permit lowering or removal of the receptacle for the wax.

The thread guiding and stripping means are mounted upona flange 28 depending from a horizontal head enclosure member or cover 30 that is mounted transversely on top of the bracket 2 by means of screws. 32. Thus the thread guiding and stripping means are separate from the receptacle !6 for the wax, and are not disturbed or moved when the receptacle is lowered or removed. Provision is made for waxing both the needle and the bobbin thread, the former passing into the wax pot through an eye 34 in the head 30, and through a guide 36 standing below the level of the melted wax in the receptacle 86 when the latter is adequately filled and in working position, said guide being affixed to the lower end of the flange 28 by a strap 38 and screw 46. Thence the needle thread passes upwardly through a scraper 42 and between a spring blade 44 and an eccentrically grooved pin 46 which cooperate to effect the main stripping action, and emerges through the notch 43 in the edge of the head 36. The bobbin thread is passed through the dry-thread tension 50, of well known design, entering the wax pot through the eye 52 in the head 3%, passing down and through a guide eye 5 t similar to guide eye 36 in all respects, and returning through scraping and stripping means 42, 44, 46, similar to those just described and emerging through the notch 56 in the edge of the head 30, thence passing over the truck 58 to the bobbin winding devices, (not shown).

The stripping means have novel features. The eccentrically grooved pins 46 are rotatably mounted in the head 36 and have portions of their length fluted or toothed as indicated at 66. Cooperating with each fluted portion is a thumb screw 62 extending at right angles to the respective pin and having its threads 64 engaging with the fluted or toothed portions 60 of the pin after the manner of a worm and gear, so that rotation of the thumb screw serves to impart a rotation to the corresponding pin 46. This arrangement facilitates adjustment of the stripping action effected by the eccentric notches, indicated at 66, in the end of the pins, the adjustment being effected from the top of the wax pot instead of from within or from a side to which other parts of the sewing machine may bar access. Further, either stripping pin 46 may be easily rotated a complete turn whenever necessary to remove wax caked thereon and interfering with the stripping action. The thumb screws 62 are retained in place by means of collars 63 which are secured by clamping screws 70 upon the reduced extremities which extend out from the under side of the material of the head 36. The stripping pins 46 are each provided with duplicate eccentric grooves 66, so that as one groove wears, the pin may be moved endwise to put the other of such grooves in operation. Each pin is held against endwise movement, so as to keep its stripping groove in proper relation with its coacting spring blade 44, by means of a screw i2. threaded into the head 36, so that its reduced extremity enters a groove F4 cut in the pin, a duplicate groove 16 being formed in proper position to align the alternative eccentric stripping groove 66 with the spring blade 44 when it is necessary to shift the pin lengthwise.

The spring blade 44 which presses the thread against the fixed surface constituted by the pin 46 has its upper extremity split to form three separate spring-fingers, the central one of which registers with the eccentric stripping groove in the pin 46, while the other two bear against the surface of the pin at each side of such groove. By this arrangement, a thread drawn upwardly from the molten wax beneath the central finger of the spring blade 44 will be prevented from escaping sidewise from between the pin and the spring blade in the event that a knot or other enlargement on the thread be drawn through the stripper, as the outer pair of fingers press closely against the surface of the pin 46 and act as guides preventing lateral deviation of the thread along the surface and lengthwise of the pin. This stripping arrangement is easily and quickly threaded up, and through retaining its hold on the thread in spite of knots, etc., prevents the annoyance of having the thread-handling parts become fouled by the action of an unstripped thread. The spring blade 44 and the scraper 42 are formed integrally of a single piece of bent spring steel, a portion of which is bent at right angles to form the attaching bracket 18 which is attached by a screw 86 to the flange 2B.

A removable cover 82 is hinged at 84 to lugs 86 upon the head 30, and serves to exclude dirt and to give easy access to the receptacle [6 for the replenishment of the supply of wax.

It will be apparent that the receptacle [6 containing the wax may be easily and quickly re- .moved for cleaning or for the purpose of threading-up the wax pot by pulling out the bolt 20 and sliding the receptacle downward along and off from the tongue l8 of the bracket. In this manoeuvre no other part of the wax pot is moved, adjusted, or disturbed. The wax receptacle It may be replaced easily and rapidly by the single reversal of this procedure.

The present application is a division of Ser. No. 407,668, filed November 16, 1929 upon which Patent No. 1,962,007 issued June 5, 1934.

Having thus described the invention, what is claimed is:

1. A wax pot having, in combination, a receptacle for the wax and a stripper comprising a fixed surface and a spring blade cooperating therewith to wipe wax from a thread passed be tween, the acting end of the blade being split into three fingers, the central one of which presses the thread against the fixed surface while the outer ones prevent lateral escape of the thread.

2. A wax. pot having, in combination, a receptacle for the wax and a stripper comprising a fixed surface and three fingers springpressed thereagainst and closely adjacent each other, the central one pressing the thread against the fixed surface to remove surplus wax while the other two prevent lateral escape of the thread.

3. A wax pot having, in combination, a receptacle for the wax and thread-stripping means comprising a rotatably mounted pin, means for rotating such pin, an eccentric stripping groove in the pin, and three spring presser-fingers, the central one thereof pressing the thread into the stripping groove, and the outer ones preventing lateral escape of the thread.

4. A wax pot having, in combination, a receptacle for the wax, and a thread-stripper comprising a spring presser blade and a rotatably mounted pin having a worm-gear, a worm engaging such gear and adapted to be rotated to turn the pin, and a plurality of eccentric stripping grooves in the pin, the latter being adjustable lengthwise while remaining in gear to bring any desired one of such grooves beneath the spring blade.

5. A wax pot having, in combination, a receptacle for the wax and a stripper comprising a fixed surface and a flat spring' metal member formed with a portion to cooperate with the fixed surface of the stripper, and a grooved portion bent at an angle to the portion cooperating with the fixed surface for scraping the thread before passing through the stripper.

6. A wax pot having, in combination, a receptacle for the wax and a stripper comprising a fixed surface and a flat spring metal member formed with a. portion to cooperate with the fixed surface of .the stripper, a grooved portion bent at an angle to the portion cooperating with the fixed surface for scraping the thread before passing through the stripper, and another portion bent at an angle to both of the other portions forming means to attach the spring member to the wax pot.

HARRY E. DOW.

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