US2712660A - Machines for applying pressure to shoe bottoms - Google Patents

Description

July 12, 1955 L. MAWBEY 2,712,660

MACHINES FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed March 7, 1952 3 Sheets-Sheet l Inventor Lawrence Ma whey bBL s/l ey L. MAWBEY July 12, 1955 3 Sheets-Sheet 2 Filed March 7, 1952 [rm/en for La wrence ZYawbef/ 0 4 6 B I w 7 a F I m |H l WW I: Kw 0 4 4 2 A N 4 5 MM 5 6 2 0 d" 1 Mn 1 HI I HHHHMHHHHHHH| I 2 h A a a I J U HHHMF |L|| 31; f

y 12, 1955 L. MAWBEY 2,712,660

MACHINES FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed March 7, 1952 3 Sheets-Sheet 3 4 gi [nvenior kw; lawre nce Mawbey United States l atent O MACHINES FOR APPLYING PRESSURE TO SHOE BOTTOMS Lawrence Mawbey, Leicester, England, assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application March 7, 1952, Serial No. 275,426

Claims priority, application Great Britain March 27, 1951 7 Claims. (Cl. 12-33) This invention relates to machines for applying pressure to shoe bottoms and particularly to single presses for use in cement-attaching soles to shoes.

Objects of the invention are to provide a single machine as distinguished from a double or twin machine whereby soles may be attached to shoes with pressureresponsive cement and whereby the production of such shoes may be increased.

Modern cements containing synthetic rubbers, when applied to a lasted shoe and its sole and allowed to dry for a period, become pressure responsive; that is, when sufiicient pressure is applied, even for a moment, between the shoe and sole they adhere firmly to each other. Such cements, if allowed to dry too long on the shoe and sole, may be treated with heat or a solvent to restore the pressure-responsive condition of the cement. Moreover, soles of synthetic rubber or crepe may be attached with these cements very readily since, under pressure, they conform to the shape of the shoe bottom more easily than leather. The illustrated machine comprises a column carrying a transversely extending pad box at a convenient height for an operator and an electric motor to provide power for raising the pad box. Abutments above the shoe and sole placed on the pad engage one the last and the other the forepart of the shoe. The abutments are adjustable longitudinally of the shoe and have step adjustments heightwise of the shoe. The abutments are carried by a horizontal bar rigidly secured to a lever fulcrumed on a vertically sliding bracket which is held raised by a tension spring.

Treadle-operated cams fulcrumed on the column engage rolls on the backet to lower the abutments, the cams having concentric portions engagement of which with the rolls prevents upward movement with the abutments. The pad box is mounted by trunnions extending transversely of it on a vertical slide, and below this slide is another slide connected by an eccentric strap to an eccentric driven by the motor. Between the two slides is a heavy spring the initial tension of which may be varied without affecting the position of the pad box.

Between the motor and the eccentric is a clutch which is set by final movement of the treadle after the concentric portions of the cams have engaged the rolls on the bracket to impart upward movement to the pad through the initially tensioned spring. After a single rotation of the eccentric the clutch is automatically disconnected.

Downward movement of the lever with respect to the bracket is limited by an adjustable stop, and its upward movement with respect to the bracket is opposed by a light compression spring which, after the abutments have engaged the shoe, may be compressed by a movement of the cams to a position where their concentric portions engage the rolls, thus holding the abutments against upward movement. When the said compression spring is fully compressed the lever engages the sliding bracket to hold the shoe positively against upward movement. The step adjustment of the abutments is thus efiected: passing vertically through blocks mounted on the horizontal bar are stems carrying the abutments.

2,7 12,666 Patented July 12, 1955 ICC Each stem is provided with a series of equally spaced holes and the block has two holes which are spaced once and a half as far apart as the holes in the stem so that a pin may be passed through either hole in the block and through one of the holes in the stem. To adjust the abutments up or down, the pin is withdrawn and entered in the other hole in the block. Then movement of the stem up or down half the distance between the holes therein will aline another hole in the stem with the pin and enable it to be replaced. Thus step adjustments of the abutment equal to one-half the distance between the holes in its stem are provided. The heavy spring through which pressure is transmitted to the shoe limits that pressure to an amount predetermined by the initial adjustment of the spring.

The light compression spring between the lever carrying the abutments and the sliding bracket insures, notwithstanding the vertical step adjustments of the abutments, that enough pressure will be applied by the cams to the abutments through the compression spring to insure that the shoe will be held in position and not displaced when the pad box rises to apply pressure to the shoe.

The rate of rotation of the eccentric by the motor is such that the length of time the shoe is under pressure is very short, there being no dwell under pressure. The action of the pad upon the shoe bottom is therefore more in the nature of a blow or percussional impact. Thus the operating time on each shoe is very short and the operating rate consequently high.

These and other features of the invention will appear more fully from the following description when read in connection with the accompanying drawings and will be pointed out in the appended claims.

In the drawings,

Fig. 1 is a front elevation of the machine with the front cover plate removed;

Fig. 2 is a view, mostly in section, of the initially tensioned spring through which pressure is applied to the pad abutments;

Fig. 3 is an enlarged detail, partly in section, of the parts shown in Fig. 1;

Fig. 4 is a side elevation of the machine with the column broken away to show the driving mechanism in the base of the machine; and

Fig. 5 is an enlarged side elevation, partly in section, of the upper portion of the machine.

The illustrated machine has a hollow column 8 which comprises a number of castings assembled together. An electric motor 10 (Fig. 4) supplies power to exert pressure on the shoe bottom, a pulley 12 of the motor being connected by a belt 14 to a larger pulley 16 below it with a consequent reduction of speed. The pulley 16 is loose on a shaft 18 which is journaled in bearings 20 on a frame 22 secured by bolts .24 to the column 8. A pinion 26 attached to or integral with the pulley 16 meshes with a larger gear 28 which is loose on a shaft 3% below and parallel to the shaft 18, the shaft 30 having bearings 32 on the frame 22. Gears 26, 28 give a further speed reduction.

The gear 28 is attached to a driving member 34 of a clutch which may be of the kind disclosed in United States Letters Patent No. 448,777, granted March 24, 1891, in the name of G. W. Drake. The driving member 34 is secured to the gear 28 and includes a driven member 36 comprising an expansible band carried by the driven member, as shown in the patent above mentioned, the member 36 being secured to the shaft 30. Pivoted to the driven member 36 is a lever 38 radial movement of which outwardly from the shaft sets the clutch. The lever is so operated by a sleeve 4!) mounted to slide on the shaft 30 and having a frusto-conical end portion .to en age the lever ,38. The sleeve .40 is moved to the right (Fig. 4) by depression of a treadle 42 mounted on a shaft 44 at the left-hand side of the machine (Fig. l), ithe shaft having bearings 45 in the rame 22 (Fig. 4). Secured to the treadle shaft 441is an upstanding arm 46 which, when the .treadle is depressed, engages a horizontal arm '48 forming part of a iever t) fulcrumed on a .vertical pin 52 in bearings 54 formed on the frame 22 a substantial distance vback of the shaft in Fig. 4. Theend of the lever carries' a pin '56 engaging a circumferential groove 53 in the -sleeve '40 so that depression of the treadle 42 will slide the sleeve to'the right and 'set the clutch. EPinned to the shaft 30 is a pinion '60 which meshes witha larger gear 62 secured to the shaft 18 and to which "also is secured an eccentric 64.connected by an eccentric strap 66 to a slide 68. On the shaft 18 is a cam 70 so shaped that, after about -one revolution of the shaft 18, it will engage aprojection72 on the leverand swing it toward the left, the sleeve -40 "then releasing the lever 38 and allowing the shaft 18 to stop.

The eccentric .strap 66 (Fig. '2) :is pivoted :by :a pin 74 to cars 76 formedon the slide 68 which is in the form of a hollow sleeve arranged to slide in a vertical cylinder 73 secured to the :column 8. 'In the hollow sleeve 68 is an inverted cup 89 having a flange 82 restingon 'a shoulder 84 of the lower portion of the sleeve 68. Outside the cup and resting on the flange 82 is a long heavy spring 86 which extends up into a slide 88 which is in the form of a sleeve formed integral vidth a pad box support 90, the sleeve sliding vertically in the cylinder 78. A rod 92 extending centrally of the sleeve passes at its lower end through the bottom of the cup .and has a nut 94 threaded on its lower end and secured against rotation by a pin 96. Between the nut 94 and the bottom of the cup is a ball thrust hearing 98. Engaging the upper end of the spring 86 is a long nut having a projection 1021thereon which engages a 'vertical slot 104 in the sleeve 88 :to prevent turning of the nut. A nut 105 threaded on the upper end of the rod 92 and 'held;from rotation by a pin 103 bears against the lower side of the pad-box support 90. The nut 10 0 is threaded on the long'threaded portion of'the rod-92 andhas a square upper end 1143 exposed in a hole in the pad support .90, the square 'end being adapted to be turned by a wrench. Turning of the 'rod willzmove the long nut 10.0 up or'down to vary the intitial tension of the spring 86 without disturbing the position of either of the sleeves 68 or:88. Hence the position of the pad-box support '90 remains'the same whatever the initial tension on thespring 36. The space in the cup 30 between the nut 94 and the eccentric strap 66 permits the cup to move relatively "tothe :nut

when'thespring is compressed-by rotation 'of theeccen- "trio.

A pad'box 112,:which maybe of the type disclosed .in my application for United States Letters ZPatent :Se-

.rial No. l92,l6.6,filed October .26, 1950, ;now Patent No. 2,602,173, granted July .8, 1952, is secured by screws 114 (Fig; 5) to a cradle vlllihaving trunnions .118 which are journaled in uprights 129. The .up-

.rights .have reduced cylindrical portions .122 .mounted in holes in the pad-box support 99 so that the -.cr;adle

and pad boxmay he lifted 05 for accessto the square end of therod 92. The pad box 112 and .a pad .124 are constructed as disclosed in 'my above-mentioned patent and are effective for a variety of shapes .of shoe bottoms that may be encountered in 'a line of work such as bottoms that are fiat from :heel to toe or bottoms that have a steep .breast face on the heel.

To sustain a shoe on a last againstupward pressure 4 mounted to slide on a horizontal bar 136. Vertical adjustment of the toe abutment is obtained by providing the stem 132 with a series of equally spaced transverse holes 138 (Fig. 3) .to' be engaged by a pin 14!) which is passed .through either one of two holes 142 in the block 134, which holes :are so spaced that when one is ,in line with one of the holes 138 in the stem 132 the other :is half way between two holes ,in the stem so that, by removingthe pin andmoving the stem 132 up or down half the distance between the holes 138, the pincan be re-inserted in the. lower-hole. Thus, the .twoholes in the block provide twice the number of adjusted positions that can be provided by one hole in the block.

ThepinlAtl is retained inposition-by a wire-spring 144 secured byascrew 146 to the block, the wireengaging a groove in the pin. The-abutment 126 is provided with similar means ,for adjusting it vertically and each block 134 is adjustable horizontally along the bar 136 and is retainedirgplaceby a latch 143 engaging teeth 150 formed in the upper edgeof the bar. The transverse bar 136 is rigidly secured at 152 to a lever v154 (Fig. 5), the rear portion of whichis forked to embrace a verticallysliding V bracket .156 to which it is pivoted at :158. The bracket 1S6 slides on a vertical shaft 16% the lower end of which seated in ,a socket 162m ahousing 2164 secured-at 166 to the column 8 andextending up to embrace the shaft 160, a transverse shaft 168 passing through the housing andthe shaft 169 to support itsupper end. The bracket .156 is held raised by a tension spring 170 connected at one end to a pin 171 on the bracket .and at the other to a .hook 172 on the housing 164. Downward movement of the lever 154 is limited by a screw 174 threaded in the lever with its head engaging a projection 176 on the bracket 156. Upward movementof the lever is opposed by a compression spring .178 mounted in asocket in the lever andengaging a projection 180 on the bracket 156,

which projection when the spring 178 iscompressed positively prevents upward movement of the lever 154 with respect to the bracket 156. Upward movement of the bracket '156-iscushionedby anelastic'washer 132 on the shaft .169 between the bracket and acollar 184 pinned intotheshaft. On each side of the bracket 156 is a roll 186, the rolls being mounted on apin 188 whichpasses through the bracket and through a vertical slot 1% in'thc shaft 160.

Twoidentical cams 192,.one oneach side of the bracket 15.6, -;are pivotedzon the shaft 168 and engage the rolls 1'86. .The .cams are integrally connected by a web ,194 which, .in thenormal position of the cams, engages a rstop .screw 1% threaded in the ,llQPBP-fiild of the housing .164. The web 194 and the two cams constitute a double cam. ,Each cam 192 has an incline'dedge face .198 which,when the camsaremoved counterclockwise (Fig. 5), moves the bracket 156 and hence the lever-154 and abutments126, 128 downwardly, and each cam has an edge face 200 which is concentric with the pivot168 so that in the-final loweredposition of the abutments theyiare locked positively against upward movement after the spring :178 has been compressed and the lever 154 engages the projection 180.

Operation of the cams 192. (Fig. 5) to lower the abutments,.:126, 128 is'eifected by afrod 292 connected at 20410 anarm2fi6 integral with the cams, the rod atits loweraend (Fig. '4) being connected to an arrnl208 .extending :from the treadl'e shaft44 and secured thereto.

Thus, depression ofthe treadle first operates zihe :cams 192 to lower the abutments and, .duringtheengagement of the concentric-portionof the cams withthe rolls 186, thegarm '46 engages the arm 48 and swings-the leverSti -to move the cone 40 to engage thelever 38 and set the clutch '34, whereupongthe motor 10 being of-course ro-- tating, the eccentric164 will *beturned to raise the pad through the spring 86- and pressthe pad against the shoe bottom and, when the eccentric 'shaft'18 has "about completed a single revolution, the cam 70 thereon strikes the projection 72 on the lever 50 and moves the cone 40 out of engagement with the lever 38, causing the eccentric shaft to stop.

In operation, with the electric motor running, the heel and toe abutments 126, 128 are adjusted respectively to what are found to be their best positions for a shoe such as is being operated upon. The shoe with the sole spotted thereon is then placed sole downward on the pad under the heel and toe abutments and the treadle 42 depressed sufficiently to bring the abutments down on the shoe. If the shoe has not been correctly placed on the pad box, the treadle may be released to allow the abutments to be raised by the spring 170 from holding contact with the shoe whose position on the pad box may then be corrected. When the shoe is correctly placed, the operator continues to depress the treadle 42 which brings the concentric portions of the double cam 92 against the cam rolls 186, thus locking the abutments against upward movement by pressure of the shoe. The

remaining treadle movement trips the clutch, causing the shaft 18 and the eccentric 64 thereon to rotate once. This single rotation of the eccentric raises the pad box 112 to press the shoe bottom with sufiicient force to cause the sole assembled thereon to adhere to the shoe bottom and then lowers the pad box to its normal position corresponding to the bottom dead center of the eccentric.

The upward thrust of the eccentric 64 is transmitted to the pad box 112 through the compression spring 86. This spring serves to limit the amount of thrust of the pad box on the shoe. This is a desirable feature inasmuch as, with a fixed length of stroke of the eccentric, the adjustment of the heel and toe abutments 126, 128 may otherwise be such as to allow an undesirably high pressure by the pad box against the shoe.

The speed reductions from the motor to the eccentric, as shown, are about 4 to 1, 3 to 1, 3 to 1. Therefore, with the motor having 1200 R. P. M. the eccentric would turn about 34 R. P. M. or once in about two seconds. The time that the shoe is under pressure is therefore momentary, that is, less than two seconds, and the time of full pressure is very short and amounts to little more than an impact.

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

1. In a cement sole attaching machine, the combination of a vertically movable pad, an abutment for a last in a shoe, an abutment for the forepart of the shoe, a

bar on which the abutments are mounted, a lever rigidly secured to the bar, a manually operated cam acting to move the lever bodily with the abutments toward the shoe on the pad, and to hold the abutments positively against upward movement, a slide carrying the pad, a slide below the pad slide, a spring between the slides, power-operated means acting on the lower slide and including a non-repeating one-revolution clutch for delivering a single percussional upward impulse to the pad slide through the spring to force the sole against the shoe bottom, and means acting after operation of the cam to initiate operation of the power-operated means.

2. In a cement sole attaching machine, the combination of a frame, means for holding a shoe against upward movement, a pair of vertically movable slides mounted in the frame, a pad on one of the slides, an eccentric connected to the other slide, a spring between the slides, power-operated means for rotating the eccentric, and means for varying the initial compression of the spring without affecting the position of either slide.

3. In a cement sole attaching machine, the combination of a vertically sliding bracket, a lever pivoted to the bracket for limited movement with respect thereto, a bar secured to the lever, abutments carried by the bar, a pad on which a shoe and its sole are placed under the abut- 6 ments, treadle-operated cam means for lowering the bracket to cause the abutments to engage the shoe, yielding means between the lever and the bracket to permit full operation of the cam means, and means for moving the pad up to press the sole on the shoe.

4. In a cement sole attaching machine, the combination of a pad, power-operated means for raising the pad, abutments over the pad to engage a shoe thereon, a lever carrying the abutments, a vertically sliding bracket to which the lever is pivoted, a cam having a fixed pivot and two cam faces, one face being inclined and acting to lower the bracket and the other being concentric with the pivot to lock the bracket against upward movement, and a spring between the lever and the bracket to permit movement of the cam to locking position after the abutments engage the shoe, the lever after full compression of the spring engaging the bracket.

5. In a cement sole attaching machine, the combination of a frame, a vertically movable first slide mounted in the frame, a pad box mounted on the slide, abutments above a shoe placed right side up on the pad, said abutments preventing upward movement of the shoe, a second slide mounted in the frame beneath the first slide, a compression spring between the slides, a rod located in the spring and rotatably connected to the lower end of the spring, a nut on the rod engaging the upper end of the spring, means for preventing turning of the nut whereby turning of the rod will vary the initial compression of the spring, and means for giving the slide a momentary upward thrust to apply through the spring upward movement to the pad on the first slide.

6. In a cement sole attaching machine, the combination of a vertically movable pad upon which a shoe is placed right side up, abutments above the pad, a lever on which the abutments are carried, a vertically sliding bracket, a tension spring sustaining the bracket, the lever being pivoted to the bracket for limited movement with respect thereto, a compression spring between the lever and the bracket, which spring is compressed by upward movement of the lever, a stop on the bracket limiting upward movement of the lever, rolls on the bracket, a double cam engaging the rolls, a treadle connected to the double cam to lower the bracket to cause the abutments to engage the shoe and at least partially compress said compression spring, and power means operation of which is initiated by further movement of the treadle for imparting a momentary upward thrust to the pad.

7. In a cement sole attaching machine, the combination of a vertically sliding bracket, a lever pivoted to the bracket for limited movement with respect thereto, a horizontal bar secured to the lever, blocks sliding on the bar, abutments having stems extending through the blocks, said stems having equally spaced holes, said blocks having holes alineable with the holes in the stems, the holes in the blocks being spaced one and a half times the distance between the holes in the stems, pins for engaging holes in the blocks and stems, a pad on which a shoe and its sole are placed under the abutments, treadle-operated cam means for lowering the bracket to cause the abutments to engage the shoe and then hold the shoe against upward movement, yielding means between the lever and the bracket to permit full operation of the cam means, and means for moving the pad up to press the sole on the shoe.

References Cited in the file of this patent UNITED STATES PATENTS Re. 8,706 Blaney May 13, 1879 240,487 Winslow Apr. 19, 1881 260,394 Horton July 4, 1882 416,620 Horton Dec. 3, 1889 584,590 Horton June 15, 1897 1,447,235 Casgrain Mar. 6, 1923 2,018,684 Mussells Oct. 29, 1935 2,117,328 Ierram May 17, 1938 2,324,129 Barna July 13, 1943

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