US2291688A - Roughing machine - Google Patents

Description

-4 1942- c. G. BROSTROM 2,291,688

ROUGHING MACHINE 2 Sheets-Sheet 1 Fil ed Feb. 25, 1941 Aug. 4, 1942. c. e. BROSTROM nouenme MACHINE Filed Feb. 25, 1941 2 Sheets-Sheet. 2

Patented Aug. 4, 1942 ROUGHING MACHINE Charles G. Brostrom, Salem, Mass, assignor to -United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey Application February 25, 1941, Serial No. 380,511

Claims.

This invention relates to roughing machines and is herein illustrated as embodied in a ma chine especially adapted for roughing the overlasted margins of shoe uppers preparatory to coating them with cement for attaching outsoles thereto.

It is an object of the invention to provide an upper roughing machine of simple construction which can be employed to rough both flat and curved surfaces of the overasted margin of a shoe upper rapidly and uni ormly without the necessity for the exercise of a great amount of skill by the operator.

Another object of the invention is to provide a duplex roughing machine having two separated vibratory roughing tools driven by mechanism so organized that the forces applied to vibrate the tools are balanced, with the result that the machine will run smoothly and quietly.

In the illustrated machine, each roughing tool consists of an endless wire-studded belt which is continuously driven, passing around three pulleys arranged in a triangle and cooperating with a stationary backing roll arranged near one of said pulleys in a manner to support against deflection and keep straight a short stretch of the belt at the operating position. With this arrangement flat portions of the work may be readily roughed in a uniform manner and when a curved surface is reached, it is only necessary to move the work slightly to a working position where the belt begins to curve around its supporting pulley. This provision of a straight stretch on a portion of the belt is advantageous in roughing fiat surfaces as compared with the ordinary circular roughing brush which inevitably tends to produce a concave surface, the curvature of which increases as the radius of the brush diminishes.

As shown and described herein, the roughing belts are continuously vibrated transversely by mechanism which moves certain of the belt guiding pulleys equally and oppositely in such a manner that the shocks occurring at reversals of movement balance each other, thus canceling the vibratory effect of the shocks upon the machine as a whole and permitting smooth and quiet operation.

These and other features of the invention and benefits afforded thereby will be better understood and appreciated by reading the following detailed description of one satisfactory embodiment thereof in connection with the accompanying drawings, in which Fig. 1 is an angular View of the machine as a whole;

Fig. 2 is a side elevation of the machine, showing a lasted shoe presented to one of the roughing belts in normal working position;

Fig. 3 is a view in side elevation, with parts broken away, of a portion of the belt vibrating mechanism;

Fig. 4 is a plan View, partly in section on the line IV-IV, of a detail of the mechanism shown in Fig. 3;

Fig. 5 is a plan view of one of the belt-guiding pulleys with a belt in position thereon;

Fig. 6 is a plan view of a detail of one of the belt backing rolls and the shoe-gaging means; and

Fig. 7 is a cross-sectional view of the roughing belt.

Referring now to the drawings, the machine is carried by an upright column ID on which is supported a casting l2 constituting the head of the machine. Extending upward and rearward from the casting 12 are brackets 14, I I6 supporting bearings I8, 20 in which runs a drive shaft 22. A pulley 24 secured to the drive shaft is rotated by a belt 26 from any suitable source of power.

Secured to the brackets I4, l6 by bolts 26 is a frame 28 having forwardly extending portions 30, 32 symmetrically arranged at the left and right sides of the machine, respectively, and affording support for the operative elements of the machine. Inasmuch as this is a duplex machine and the right-hand and left-hand mechanisms, although symmetrical with respect to each other, are mechanically identical the same reference characters will, in most instances, be used for both.

An endless roughing belt 34 which is driven continuously by a pulley 36 secured to the shaft 22 passes around an upper guide pulley 38 journaled upon a stationary stud 40 mounted in the frame 28 and thence around a lower guide pulley 42 which is journaled upon a stud 44 secured in the forward end of an arm 46 which is mounted to oscillate about a fixed stud 48 screwed into the frame 28 and secured by a set screw 50 (see Fig. 2)

Pivoted to the arm 46 by a pin 52 is one end of a connecting rod 54 (from the right-hand roughing. mechanism) or 56 (from the left-hand roughing mechanism) Extending forward from the frame 28 is a stationary bracket 58 in which is secured a stud 60 and pivotally mounted upon this stud are two rocker arms 62, 64 to the forward ends of which are pivoted, respectively, the connecting rods 56 and 54 by means of pins 66 and B8.

The rear ends of the rocker arms 62, 64 are forked, as shown at I8, I2, to receive sliding blocks I4, I6 which are journaled, respectively, upon eccentrics I8, 80 formed upon a shaft 82 running in a suitable bearing in the bracket 58. Secured to the upper end of the shaft 82 is a pulley 84 connected by a belt 86 to a drive pulley 88 upon the shaft 22. The belt 86 passes over an idle pulley 90 mounted in a post 92 which is adjustably secured in the frame 28 by a set screw 94 to permit adjustment of the tension of the belt 86.

The eccentrics I8 and 80 are oppositely disposed, 180 apart, and inasmuch as the shaft 82 is driven continuously the two roughing belt guide pulleys 42 are continually vibrated transversely in opposite directions through equal distances. The purpose of this is to produce continual transverse vibratory movement of the belts 34, in order to facilitate uniform roughing action by the avoidance of continuous grooves or scratches in the work. Inasmuch as the amplitude of this vibration need not be great, the throw of the eccentrics I8, 88, the showing of which is somewhat exaggerated in .Figs. 3 and 4 for the sake of clarity, is small.

The roughing belt 34 is similar to a carding belt, consisting of a strip of leather or canvas 96 (see Fig. 7) studded with wire staples 88 which are embedded in, and surrounded by, a body of yielding felt Iiiii. A layer I02 of fabric is secured to the back face of the belt to aid in holding the staples securely therein.

Mounted for free rotation in a fork I84 having a shank portion I88 adjustably secured in the frame 28 by a set screw IE8 is a stationary, freely rotatable, backing roll III] which is positioned a short distance above the guide pulley 42 and serves to support against deflection and maintain straight a short vertical stretch of the roughing belt at the operating position despite the pressure of the work against the belt, the belt being fairly stiff and not susceptible to bending in the short space between the guide pulley and the backing roll.

In Fig. 2 a lasted shoe H2 is shown in engagement with the roughing belt and having the overlasted margin of its upper roughed thereby. In order to prevent accidental use of the yieldable stretch of the belt above the backing roll I I8 and facilitate the presentation of the shoe to the proper portion of the belt, there is provided, adjacent to the backing roll, a shoe gage consisting of a pair of rolls H4 which are freely rotatable upon pins H6 secured in a holder H8 adjustably mounted by means of screws I28 upon a portion of the frame 28. The rolls IE4 are spaced apart slightly further than the width of the belt 34 to permit the transverse vibration of the belt.

Secured in a stationary bracket I22 which depends from the frame 28 is a guard member I24 which lies close to the roughing belt below and toward the front of the guide pulley 42 and serves to prevent the work or the operators from bein injured by accidental contact with the portion of the belt beneath the pulley, although permitting the use of a considerable portion of the belt where it curves around the front of the pulley.

The two roughing belts 34 are space-d far enough apart to permit their simultaneous use by two operators, or they may be adapted to produce roughing of different grades of fineness, as sometimes required on a single shoe, and both belts may be used by the same operator.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

1. In a roughing machine the combination of a pair of guide pulleys, an endless roughing belt passing around said guide pulleys, a stationary backin member engaging a portion of the belt near one of said guide pulleys, to support that portion of the belt against deflection from straight line movement by pressure of the work thereagainst, and a stationary guard member close to the face of the belt at the opposite side of said guide pulley from said backing member and so positioned as to expose for use a portion of the belt where it is curved around the pulley.

2. A duplex roughing machine comprising a pair of separated, continuously driven, roughing tools, and means for vibrating said tools simultaneously through equal distances in opposite directions transverse to the direction in which said tools are driven.

3. A duplex roughing machine comprising a pair of separated, continuously driven, roughing belts, and means for continually vibrating said belts, transversely to the direction in which they are driven, simultaneously through equal distances in opposite directions.

4. A duplex roughing machine comprising a pair of separated, continuously driven, roughing belts, a continuously driven shaft, 2. pair of oppositely directed eccentrics on said shaft and similar connections between the eccentrics and the roughing belts, respectively, whereby the belts are continually vibrated in opposite directions transversely to the direction in which they are driven.

5. In a roughing machine, the combination of a pair of space-d guide pulleys, an endless roughing belt passing around said guide pulleys, a stationary backing roll engaging a portion of the belt near one of said guide pulleys to support that portion of the belt against deflection from straight line movement by pressure of the work thereagainst, and a work gage arranged adjacent to said backing roll to prevent accidental presentation of the work to a yieldable portion of the belt beyond the backing roll.

CHARLES G. BROSTROM.

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