US2258711A

US2258711A - Work support

Info

Publication number: US2258711A
Application number: US342304A
Authority: US
Inventors: Mawbey Lawrence
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1940-02-22
Filing date: 1940-06-25
Publication date: 1941-10-14
Anticipated expiration: 1958-10-14

Description

061. 14, 1941. MAWBEY 2,258,711

WORK SUPPORT Filed June 25, 1940 2 Sheets-Sheet 1 Oct. 14, 1941.

L. MAWBEY WORK SUPPORT Filed June 25, 1940 2 Sheets-Sheet 2 Egg WM Z222 Patented Oct. 14, 1941 2,258,711 WoRK SUPPORT Lawrence Mawbey, Leicester, England, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation ofNew Jersey Application June 25, 1940, Serial No. 342,304 In Great Britain February 22, 1940 12 Claims.

This invention relates to means for supporting work pieces which are to be operated upon and is illustrated as embodied in a machine for applying pressure to a seam ridge formed by joining two or more pieces of material such as parts of shoe uppers although it is to be understood that the invention is not limited to such application.

In machines of this type it is desirable that the pressure applied to the work be a yielding pressure to prevent damage to the work and this may be accomplished by providing a yielding mounting for the work support. In order to accommodate difierent types of work, it is desirable that provision be made for varying the forces exerted by the yielding mountingwhich opposes movement of the support away from the operating means.

Accordingly it is an object of this invention to provide a work support'having an improved yielding mounting, the effectiveness of which may be easily adjusted to vary the force resisting the pressure applied thereto through a work piece resting on the support.

To this end and asla feature of the invention, a' pair of springs of unequal size are arranged to oppose downward movement of the work support and means are provided to vary the relative effectiveness of the springs on the support. These springs in the illustrated arrangement are arranged to act on a bar which transmits the force exerted by the springs to'a pivoted arm one end of which is in contact with the bar and may be moved therealong between the points of applications of the springs. The force exerted on the arm through the bar varies with the point of contact between thebar and the arm by reason of the unequal forces exerted by' the springs and this arm in turn transmits the force to the work support to resiliently oppose movement thereof by pressure applied to the support through a work piece thereon.

These and other features of the invention will now be described in detail in the specification and illustrated in the drawings, in which Fig. 1 is an end elevation, partly in section, of one form of machine in which the invention may be embodied;

Fig. 2 is a front elevation, partly in'section, of the machine;

Fig. 3 is a vertical section on the line III-III of Fig. 2; and v Fig. 4 is a horizontal section on the line IVIV of Fig. 3.

The illustrated seam-rubbing machine com- 55 prises a frame having a base E0 in which is pivotally mounted at ii a housing [4. The housing it slidably supports a post It carrying at its upper end a freely rotatable roll IQ for supporting thework to be operated upon. A vertically adjustable guide plate 20 is secured to the post It by a screw 22, this guide plate being arranged to engage the seam of a work piece.

The machine also includes a head 2% in which is mounted a work presser or hammer 26 and a seam-rubbing tool 28, these members being operated With a four-motion cycle by an eccentric 30 ina well known manner successively to hammer the seam and set or rub it. A pair f of guides 32 are arranged to engage opposite sides of the seam ridge and are mounted for independent yielding movement to accommodate variations in thickness of the material being operated upon. These guides are formed at the lower ends of bell crank levers pivoted at 36 within a sleeve member 38 secured to a slidable post 40 guided by bearings 42 in the head of the machine. The post 40 is urged downwardly by a spring 44 acting between the upper bearing 42 and a collar 66 secured to the post. Downward movement of the post is limited by an extension 4'! (Fig. 2) of the sleeve 38 engaging the head of a screw 49 threaded into a bracket supoprting the lower bearing member 42.

The guides 32 are urged inwardly by a plate 56 engaging the upper arms of the bell crank levers on which the guides are formed, this plate being urged downwardly by a spring 52' the upper end of which engages the lower end of a rod 54 slidably mounted within a vertical bore in the post 40; The upper end of the rod 54 (Fig. 1) is engaged by an arm of a bell crank lever 56 pivoted at 58 to a bracket 60 secured to the head of the machine, the vertical arm of the bell crank lever 56 being threaded to receive an adjusting screw 62 the inner end of which engages a depending lug 64 of the bracket 60; Accordingly, the force exerted by the spring 52 to urge the guides 32 inwardly may be readily adjusted by the screw 62.

A gage 66 secured by a screw 68 to the sleeve 38 extends between the guide members 32 to engage the upper face of the seam ridge. A hinged cover ll] encloses the driving'mechanism in the head 24, this cover being maintained closed by a spring-pressed latch 12. r

I The housing [4 in which the supporting post I6 is slidably mounted is normally held in vertical position by a latch 14 urged into engagement with the lower surface of a shoulder I6 of the housing I4 by a spring I8. Upon moving the latch I4 out of engagement with the shoulder I6, the housing I4 will tilt by gravity in a clockwise direction as viewed in Fig. 1 about the pivot I2 to a position in which the shoulder I6 contacts a resilient bumper 80 secured in the base I of the machine. This permits movement of the supporting roll I8 toward the operator and from under the operating members carried by the head of the machine, whenever desired, to permit access to the operating parts of the machine, etc. l H

The lower end of the supportingtpost I6; bears against the head of a screw 82 (Fig. 22) secured to a horizontally extending arm of a lever 84 fulcrumed at 86 between a pair of arms 88(2):;

tending downwardly from the housing I 4. The

lever 84 has an extension 90 (Fig. 2) extending downwardly from the pivot 86 and carrying a Pi P 92 e ndi g h r zon a ly a a ri h n l h 1313/0586; A er qally exten n 54 is p v Q ih Pi 9? and orms a f the lever 84. v The arm 94 is arranged to be acted po by a Pa of s i s B and sh n a compression springs to move the lever 84, a clockwise direction, as viewed Fig. 2, thus exertieg upward i ie en h P t 5- T e springs 06 and 98' act in a direction parallel to the pin 02 upon which the arm 94 is pivoted so that they exert no force tending to rotate the arm 94 about the pin 92. v e

The springs 96 and S8 are supported in horizontal bores in the lower endof the housing I4 and act on plungers I00 and H12, respectively, these plungers carrying at their outer end a bar I04 Movement ofthe plungers I00 and I02 toward the arm 94is limited 'by'nuts I06 secured to the inner ends of the plun'gers and engaging the outside of the lower'portion of thehousing I4. The vertically extending arm 94 has, a hear ing member'I08, which engages the adjacent surface of the bar I04 at ya'rio'us''pointsfalong the bar depe'ndin'g upon the, position of" the arm 04 relative to its supporting pin 92. The arm 04 is held against accidental displacement from various positions relativert o theban't04'by a spring- 1 detent 'I'Ill (Figfzj arrangedto engage oneofa plurality of recesses H2. The movement of the arm '94 "about the pin 92 is limited by projections H4 and H6 (Fig; 3 the projection III being arranged to engage the lower end of the arm 90 of the lever 84 and the projection II6 being arranged to engage the lower surface of one of the arms88'of the" housing I4 As indicated in Fig. 4, the wires of which the

springs

96 and 98 are madefare or differentthicknesses the spring 96 being relatively weak com-, pared to the spring 03 so that the forces exerted by these springs through the bar I04 to thearm 9 4 are considerably di'iierent. Accordingly, the force transmitted through the bar I04by' the springs 06 and 96 to the arm 94 will vary accordance with the point of contact or the bearing member I08 carried by the arm 04 with the bar. Thus if the arm 64 be moved; toward; the right s viewed. in F s. 3 n 19. oward, th plu c e c pen b he. heav rinsfih the effect of this spring on the arm Qiwill; be. increased while the arm will be decreased,- The net result is that a greater force is transmitted by the springs to the arm 94, this force being transmitted through the leverti to the supporting post It'so that a greater force'must be exerted on the, roll; I8 to presse he efie t o e l t. pr n:

cause downward movement thereof. The arm 94 has a finger piece I20 extending upwardly through the base of the machine by which the position of the arm 94 relative to the bar I04 may be easily adjusted by the operator, this adjustment varying the force exerted on the supporting post I6: The tep of the base I0 is provided with a. plate I22 adjacent to the finger piece I20, this plate having suitable indicia to indicate the force exerted on the supporting post.

The upward movement of the post I6 by the

springs

96 and 98 is limited by a bracket I24 (Fig. 1) securedto the post I6 by screws I26 and arrangedito engage the lower end of a stop screw I28 threaded through the upper end of the housing I4.

In order to permit downward movement of the roll i8 for presentation of work to the machine without tilting the supporting housing I4 about the pivot I2, a chain I30 is secured to the outer 9d, Q fih y??? and may b se ur at its other to a treadle whereby the operator may meye the lever downwardly against'the forces exerted by the springs 96 and 98to permit the post I6 to move downwardly by gravity, thus in--. creasing the spacing between the roll I8 and the operating members With the construction above described, the force opposing downward movement of the post I6 is very easily adjusted by moving the arm 94 through the finger piece I20 about its supporting pin 92 to vary the point oi contact b tween the member I08- carried by the arm 94 and the bar I04. With arrangement the force exerted on the supporting post may be'v'aried between the force exerted by the light spring 96, and that exerted by the heavy. spring 98. This adjustment is easily and quickly made and the amount of force acting upwardly on the post I6 may. be ascertained by the position oi the finger piece I20 relative to the indicia in the plate I22.

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

1. In combination, a work support, means providing a yielding mounting for said work support, said means comprisinga plurality of springs arranged to exert unequal forces, and single means for varying the relative efiectiveness of aid sii i s 2. In combination, a work support, means pro-. viding a yielding mounting for said work support, said nieanscomprising a pair of springs of different strength, and single means for varying the relative efiectiveness oi said springs.

n omb a i n. a l mo b e w k support, a lever against one end or which the lower end 0; the support rests, a pair of compression springs acting against the opposite end of said lever, said springs being arranged to, exert d fifi m pi fi Q 5. 1 and m n simultaneouslyvarying the efiect ofsaidsprin S; n aid. e

in omb at on, a t cal y movable work 9199% a ever a a nst n h eh. he 0K?! ende 'bhe SPPBOXUWF r he othe a m of a d nev r e n pi ted, ereto: a n a s-ri h angles to the axis of the fulcrurn'qf-gsaid lever, pair pr s anged; sir a' r side' ai springs being arranged to exert unequal forees nd ar be ween aid th r arm of a d leve and the adjacent ends of said springs for t tansm t g the forc s e e ed by saidspr as toqsai lever.

I com ina ipnl a ertica y movable Wor support, a lever pivoted about a horizontal axis, said work support resting on one arm of said lever, the other arm of said lever being pivoted thereto about an axis at right angles to the axis of the fulcrum of said lever, a bar parallel to the axis of the fulcrum of said lever and arranged to be engaged at any one of a plurality of points along the length thereof by the outer end of the other arm of said lever, and a pair of springs acting against opposite ends of said bar, one of said springs being relatively strong and the other being relatively weak.

6. In combination, a vertically movable work support, a bell crank lever pivoted about a horizontal axis and having a horizontally extending arm underlying the lower end of said work support, the other arm of said bell crank lever extending upward and being pivoted to said lever about a horizontal axis at right angles to the axis of the fulcrum of said lever, the lower end of said upwardly extending arm being provided with stops .to limit the pivotal movement of said upwardly extending arm relative to the other arm of the lever, and means for opposing rotation of said bell crank lever constructed and arranged to exert a force varying with the pivotal movement of the upwardly extending arm.

'7. In combination, a vertically movable work support, a bell crank lever pivoted about a horizontal axis and having a horizontally extending arm underlying the lower end of said work support, the other arm of said bell crank lever extending upward and being pivoted about a horizontal axis at right angles to the axis of the fulcrum of said lever, the lower end of said upwardly extending arm being provided with stops to limit the pivotal movement thereof, a horizontally extending bar parallel to the axis of the fulcrum of said lever with which the upper end of the upwardly extending arm of the lever is arranged to engage, a pair. of compression springs acting against opposite ends of said bar and urging said bell crank lever in a direction to oppose downward movement of said work support, said springs being arranged to exert unequal forces on said bar, and means cooperating with the upwardly extending arm of said bell crank lever for maintaining the upper end thereof in various positions relative to said bar.

8. In combination, a pair of coiled compression springs arranged side by side, said springs being of difierent compression strength, a bar against the outer ends of which said springs act, an arm bearing against said bar for transmitting the forces exerted by said springs on said bar, said arm being arranged to bear against any one of a plurality of points on said bar along the length thereof.

9. In combination, a pair of coiled compression springs arranged side by side, one of said springs being stronger than the other, a bar connected at its ends to the outer ends of said springs,

an arm pivoted about an axis substantially parallel to the axes of said springs, the outer end of said arm being arranged to engage said bar, said arm being also pivoted about an axis substantially parallel to said bar.

10. In a seam-rubbing machine, a work-supporting roll, instrumentalities located above said roll for operating upon the seam of a work piece supported on the roll, a vertically slidable post supporting said roll, a pair of springs of different strength acting on said post to oppose downward movement of the roll, and means for simultaneously varying the effectiveness of said springs on said post.

11. In a seam-rubbing machine, a work-supporting roll, instrumentalities located above said roll for operating upon the seam of a Work piece supported on the roll, a vertically slidable post supporting said roll, a lever pivoted about a horizontal axis, one arm of said lever underlying said post, said lever including an arm pivoted about an axis at right angles to the axis of said lever, a pair of compression springs of different strength parallel to the pivotal axis of said lastnamed arm, and a bar connected to the outer ends of said springs and transmitting the forces exerted thereby to' the outer end of said lastnamed arm.

12. In a seam-rubbing machine, a work-supporting roll, instrumentalities located above said roll for operating upon the seam of a work piece supported on the roll, a vertically slidable post supporting said roll, a lever pivoted about a horizontal axis, one arm of said lever underlying said post, said lever including an arm pivoted about an axis at right angles to the axis of said lever, a pair of compression springs of difierent strength parallel to the pivotal axis of said lastnamed arm, a bar connected to the outer ends of said springs and transmitting the forces exerted thereby to the outer end of said lastnamed arm, and means cooperating with said last-named arm for maintaining the arm in any one of several different positions relative to said bar.

LAWRENCE MAWBEY.