US1384830A - Work-support - Google Patents

Description

G. GODDU.

WORK SUPPORT.

APPLICATION FILED AUGJ, 1918.

Patented July 19, 1921.

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WORK SUPPORT.

APPLlcAloN FILED Auw, 191s.

' Patented July 19, 1921.

G. GODDU. woRK SUPPORT.

APPLICATION FILED AUG. l.v 1918.

Patented July 19, 1921.

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UNITED STATES PATENT OFFICE.

GEORGE GODDU, OF WINCHESTER, MASSACHUSETTS, .ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATTERSON, NEVI JERSEY. A CORPORATION OF NEW JERSEY.

WORK-SUPPORT.

Application filed August 1, 1918. Serial No. 247,738.

To all 'whom t may concern.'

Be it know-n that I, Gnomes Gonne, a citizen of the United States, residing at Winchesten in the county of Middlesex and State of Massachusetts, have invented certain Improvements in `VVork-Supports, of which the following description, in connection with the accompanying drawings, ris a specification, like reference characters lon t-he drawings indicating like parts in the several figures. f

This invention relates to work supports and to work support controlling means which are particularly adapted to machines foruse in the.' manufacture of boots and shoes and is herein shown as embodied in a construction comprising a work support of the jack type such as is .employed in connection with a machine for inserting fastcnings. tion is shown incorporated is especially adapted for the insertion of fastenings on the heel seats of the soles of boots and shoes. It will he understood, however, that the invention` is applicable to other types of machines and is capable of utilization in connection with other types of work support-s.

lt is desirable that the work in all cases be clamped firmly duringthe insertion of fastenings in order thatthe parts to be secured or nailed or studded will be held fixedly in proper position and the fastenings fully and properly inserted. Heretofore considerable difficulty has been encountered in securing proper clamping pressure on work as it is presented to the fastening inserting mechanism due in partto differences in depths and conditions: of lastipin holes of lasts on which the work is mounted, but more generally to differences in the thickness of the work, as for instance'in the height of heels, to differences in the height of lasts, and to other differences tending to a lack of uniformity in characteristics of the work. Commonly in machines usedfor the insertion of fastenings as heretofore constructed, adj ust-ment of the work support to provide for proper clamping of the work has been carried out by manually operated means. Because of variations in the work and in the conditions attendant upon presentation of work to the operating instrunientalities as described above, frequent adjustment of the Work support became neces-V The machine in which the invenof the work or in the heights of the lasts on which the work was mounted. This was due to the inconvenience and general unvdesirability of the manual adjustment of the work support which demanded of the operative the exercise of considerable skill and judgment since no work measuring means was provided.

It is an object of the present invention to provide improved means for measuring the work and for insuring the application of proper clamping pressure thereon for all variations in thickness or other characteristics of the work as present-edA to the machine.

Features of the invention f consist in a novel organization of inea-ns for rendering the work support automatically adjustable to variations inthe work wherein the construction and arrangement preferably are such that the work is measured and has final clamping pressure applied thereto before the machine is started.

My invention contemplates also a novel form of work support in which the means for applying final wrak-clamping pressure is manually operated and con means for measuring the work preliminary to the application of such pressure.

(Ether imj'iortant features and objects of the invention will appear from the following description and claims when considered in connection with the accompanying drawings.

In the drawings, Y

lt'igure l is a side elevation view partly in section. showing my invention applied to a fastening inserting machine;

Fig. 2 is a detailed front view of a portion of the work measuring mechanism of my invention;

Fig. 3 is a detailed side View of portions shown in Fig. 2, and

Fig. 4t is an extensible connection between the starting treadle and the cam which controls the measuring mechanism;

For the purpose of illustration, the invention is shown embodied in fastening` inserting machine of the type disclosed in the Letters Patent No. 1,030,775, granted June 25, 1912, to George Goddu, `the said machine consisting of fastening inserting mechanism indlcated by reference character 4 having the usual work abutment 6 and work gage 8.

Mounted in the frame 10 of the machine is the usual horn or jack shaft 12 which rests atits lower end on lever 14, the connection between the jack shaft 12 and lever 14 comprising a slidably pivoted block 16, the con-A is locked to its casing or surrounding bracket by means disclosed in the last-mentioned patent whenever the toggle is broken to cause the work-releasing movement of the work support while the work is being fed. Adjustably attached to the upper end of the slide 24 is a rod 28 surrounded by a heavy spring 30 extending from the collar 32 on the rod 28 to a partition plate located at 34 in the machine frame. To make and break the toggle there is pivoted at 36 on the machine frame a bell crank lever 58 connected by a link 40 with the pivot 42 of the toggle links 20 and 22, said bell crank 38 being operated in properly timed relation with respect to the inserting mechanism by means of a cam on the main shaft 44 through a link 46 attached to the upper' arm of the bell crank. After the work has been placed upon the ack spindle 48 the same may be elevated to press the work against vthe alnltment 6 by depressiing the treadle 50, the latter being` connected by a ling 52 to a `bell crank 54 pivoted at A56 and having a cam portion 58 which coperates with a cam projection 60 on one part of a two-part lever 14 to raise the jack shaft 12 as said vpart of the lever 14 moves with respect to the otherl part about the pivot 62 as a` fulcrum, it being understood that the nn:- chine comes tovrest with :the toggle 20, 22 in the position shown in Fig. 1. The construction and arrangement of the jack sfpiinlle is such that the work mounted thereon is pressed against the abi'itincnt 6 when themachine is at rest. Initial upward movement ofthe supporting member Yfor the jack spindle is followed by locking of the spindle to itssupporting member after which said part ofthe lever 14 ceases to turn about 62 as a fulcrnm and 'turns instead about pivot 64 in the block 16 thus raising the free vend of the other vpart ofthe lever and through the toggle'mechanism and rod 28 compressing the spring 30 and in this manner effecting final clamping pressure on the werk. Following this, further or continued downward movement of the treadle 50 causes the actuation -of the shaft 44, and hence of the power means for operating the work support and the inserting mechanism, through the upward movement given to the rod 66 which controls the clutch starting mechanism on shaft 44, there being a yoke connection 68 between the rear end of the treadle 50 and the said rod 66. All of the mechanism thus far described will be found set forth inl detail in the patent to Goddu No. 1,011,941, referred to above. A. separate treadle 69 may be provided for starting the machine, this arrangement being such that the work support remains in lowered or work-receiving position while the fastening inserting mechanism is operated.

Mounted upon the horn or jackV shaft 12 is the work support mechanism shown in the present,embodiment ofthe invention to comprise a jack spindle 48 pivoted on a transverseV axis 70 to a plate 72 mounted to rock on an axis at rig-ht angles to the first-mentioned axis, in a manner similar to that shown in the patent to Cuff, No. 919,424, granted April 27, 1909, and carried by a slide 74 having conveniently'shoulders or projections 76 to which are attached the .corresponding ends of two springs 78V preferably ofthe form shown in Fig. 1 of the drawings, the other ends of said springs being attached by screws 80 to a housing 82 tixedl' secured to the lower end of a bracket 84 in which 'housing the plate 74 is sl'idablyvreceived. The housing 82 and bracket 84 constitute a supporting member for the plate- 74 and the parts carried thereby. rlhe plate or slide 74 is retained 1n lts housing by means ot a pin-and-slot connection indicated at 88. Upon reference to 2 of the drawings it will be observed that the plate 741s provided with rack teeth 86 at its opposite edges, the rack teeth on one edge facing upward-lv `and those .on the other edge downwardly. Y v n Mounted in the housing 82 arel pawls 88 and 90 pressed upon by plungers 92 and 94,

`respectively, the latter being backed by,

springs 96, the construction and arrangementvbcing such that the pawls are pressed in a direction to engage the teeth 86`on plate or rslide 74. The said pawls, however, are normallyvkept out of contact with the teeth of the slide by means of a -camplate 98 connected by an extensible connecting member y100 with the Vtreadle 50. Extending from a lixed member 102 on the frame 10Y The extensible connectionY referred to above comprises a rod 110 con-V nected at its lower end'to the treadle 50 and slidably engaged in guideways 112, 114, in the member 116, the said rod 110 carrying a collar 118 between which `and the guide 112 is interposed a spring 120 surrounding the rod 110. The upper end of member 116 is pivotally connected at 122 to the lower end of the cam plate 98.

l/Vhen the machine is at rest the last on its supporting jack spindle 48 is normally pressed into contact with the abutment 6 by means of the springs 78 since the pawls 88 and 90 are held out of contact with the plate 74 by means of the cam plate 98. In order to remove the work the operative pulls the jack spindle 48 forwardly from beneath the abutment 6, the said spindle rising the full height permitted by the pin and slot connection 83 under the tension of springs 78. The work is then removed and work on another last substituted and located under the abutment 6 by shoving the jack spindle rearwardly and downwardly against the action of the light springs 78. When the work is in position the operative depresses treadle 50 to move the cam plate 98 downwardly and simultaneously lift the housing 82 on the supporting member 84 through connections with the lever '14, the result being that the cam plate 98 and the locking pawls 88 and 90 are both moved in directions away from each other so vthat finally the pawls engage the teeth 86 on the slide 74 and lock the said slide to the housing on the supporting member 84. During the time that the plate or slide 74 moves relatively to the housing 82 of member 84, the work is supported in contact with the abutment through the action of springs 7 8 only, and the work support mechanism adjusts itself automatically to the thickness of the work. As soon as the locking pawls engage kthe teeth on the plate 74, pressure is applied to the work through the lever 14 as it turns about the fulcrum point 64 in applying gradually increasing pressure on the spring 30. Before the treadle is fully depressed bell crank 54 has completed its operation on lever 14 and the work is under final clamping pressure supplied by the strong spring 30. On the completion of the downward movement of the treadle the clutch on the main shaft is actuated to start the fastening inserting mechanism in operation.v Thus the work is held firmly for the impact of the fastening inserting mechanism. As the machine continues to operate the work support is lowered through the breaking of the toggle 20, 22, to permit the work to be fed, the spring 80 being held under compression through locking of the slide 24 in its housing 26 as disclosed in the v Vpatentsv to Goddu referred to above. At the end kof the feeding movement ythe toggle is again straightened and the spring 30 rendered operative to press the work firmly against the abutment while the fastening is being driven. The work support never descends far enough during the work feeding operations to unlock the spindle from its supporting member. Adjustment of the member 106 in its supporting arm 104 will determine the amount of movement of the plate 98 directly by the treadle. If, for instance, the adjustable member 106 is adjusted downwardly greater movement of the plate 98 by the treadle will be permitted and hence the locking pawls will engage the slide 74 earlier inthe cycle of operations, thus holding the fulcrum point 64 at a lower point with the result that greater pressure is placed upon the work through the increased pressure on spring 30 as the lever 14 is turned about said fulcrum point. On the other hand, if the adjustable member 106 is adjusted upwardly so that there is little or no downward movement of the plate 98 when the treadle is depressed, then the supporting member 84 and its housing `82 must in their upward movement release the pawls 88 and 90 from the cam plate 98 to lock the jack spindle to its supporting member with the result that the fulcrum point 64 is moved upwardly to a greater eX tent than before and thus less pressure is placed upon the spring 30 as the lever 14 turns about said fulcrum point. Obviously, the locking pawls and, through said pawls, the work ymeasuring means are both controlled by the treadle and by the mechanism for applying final clamping pressure on the work.

It will be clear that the mechanism described above provides a means for insuring the application of uniform pressure upon the work even though the work varies considerably in thickness. This is due to the fact that the work is preliminarily pressed against the abutment 6 by the springs 78 and to the constructionwhich permits relative movement between the support 48 and the actuating member 14 until the locking pawls finally become operative to lock these parts together so that a firm clamping pressure on the work is supplied through lever 14 and the spring 30.

' Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a machine of the class described, a work support movable between work-receiving and work-clamping positions, means for measuring the work comprising a spring normally operative to lift the work support to work clamping position. and manually operable means for applying final workclamping pressure constructed and arranged to control said measuring means.

2. In a machine of the class described, an abutment, a work support movable between work-receiving and work-clamping positions,

means for locking the support against movement after measurement has been. effected, manually operable means for applying nal work-clamping pressure, and means separate from said manuallyoperable means for controlling the locking means.

4. In a machine ofthe class described, a work support movable between work-receiving and work-clamping positions, means comprising a treadle for moving the work support toward work-clamping position, means operating yieldingly to press the work support in the same direction, means for locking the work support to said firstmentioned means, and controlling means for said locking means separate from the moving means and operable to causethe work support to be looked to the moving means at a determined point in the operation thereof.

5. In a machine of the class described, a work vsupport movable between work-receiv ing and work-clamping positions, means for starting the machine, means comprising a spring vfor measuring the work, means for locking the support against movementV in a direction to compress said spring after measurement has been effected, means actuated by said starting means for controlling the locking means,` and means separate from the controlling means for applying final work-clamping pressure.

6. In a machine of the class described, a work support 4movable between work-receiv ing and work-clamping positions, a work abutment, means comprising a spring for normally pressingthe work on the support yieldingly against said abutment, treadleoperated means for movingfthe` support to ward said abutment, and means .controlled by said treadle-operated means for locking the work support against movement by said spring.

7. In a machine of the class described, a work abutment, a work support movable between Vwork receiving and work clamping positions, a supporting member therefor', treadle operated means for moving the supporting member to lift the work support toward said abutment, and means separate from said treadle operated means and controlled by said treadle for locking the work support to its supporting member.

8. In a machine of the `class described, a

workabutment, a work support movable between work-receiving and work-clamping positions, a supporting member therefor, means for yieldinglyA pressing the Work on the support against said abutment, treadleoperated means for mov-ing the supporting member to lift the work support toward said abutment, and. means Yseparate from the treadle operated means and controlled by said treadle for lockingvth'e work support i work-clamping position.

9. In a machine of the class described, a work abutment, a work support, a supporting member therefor, `said work support being movable relatively .to its supporting member between work-receiving andrworkclamping positions, means for yieldingly pressing the work on the support against said labutment, means for locking the support tagainst operation byA said pressing means, and means Vdistinct from said locking means and operable on said supporting member to apply final clamping pressure on the work before the machine is startedl in operation.l ,Y Y

. 10. In a machine of the class described, a Iiack spindle movable between work-receiving and work-clamping positions, -a supporting member therefor, spring means interposed between the spindle and its supporting member for moving the spindle toward work-clamping position, and manually con- Ytrolled means for locking the spindle to its supporting member against movement by said spring.

11. In a machine of the class described, la work support movable between work-receiving and work-clamping positions, a supporting member yield-ing y connected thereto,

means for periodically depressing said sup.

porting member, means for starting the machine, and means controlled bysaid starting means for causing relative movement between the work support and its supporting member. f

12. In a machine of the class described, a Work support movable between work-receiving and work-clamping posit-ions, a supporting member therefor, means for periodically depressing said supporting member, means for starting the machine, and means controlled by said starting means for locking the work support to its supporting member,y

said locking means being constructed and arrangedto retain the work support in locked relation to the supporting .member upon depression of said member.

13. In a machine of the class described, a jack spindle movable between Work-receivingand work-clampingv positions, a supporting member therefor, means for starting the n mach1ne,means controlled by said starting means for moving the spindle toward Workclamping position, and means carried by the supporting member for locking the spindle to the supporting member.

14. In a machine of the class described, a jack spindle movable between work-receiving and work-clamping positions, a supporting member therefor, manually operable means for moving the spindle toward workclamping position, means for periodically depressing the supporting member, and means controlled by said first-mentionedI means and operable upon the supporting member for yieldingly moving the spindle in the same direction as said first-mentioned means.

15. In a machine of theclass described, a jack spindle movable between work-receiving and work-clamping positions, a supporting member therefor, means for moving the spindle toward working-clamping position, power means for moving the supporting member and spindle toward and from workclamping position, and means controlled by said first-mentioned means for locking said spindle to its supporting member' during a complete cycle of operation of the power means.

16. In a machine of the class described, a work support movable between work-receiving and work-clamping positions, a supporting member therefor, means for starting the machine, means for effecting relative movement of the spindle and its supporting member and for locking the spindle in proper relation to the supporting member, and means operable by said starting means and movable relatively to the supporting member for controlling the locking means. Y

17. In a machine ofthe class described, a work support movable between work-receiving and work-clamping positions, said support comprising a jack spindle and a supporting member therefor, means for controlling the movements of the spindle relatively to its supporting member, means for starting the machine, and a cam controlled by said starting means for controlling said first mentioned means.

1S. In a machine of the class described, a. work support movable between work-receiving and work-clamping positions, means for starting the machine, means actuated by the starting means and controlled by the thickness ofthe work for applying final workclamping pressure prior to the starting of the machine, and means movable relatively to the pressure applying means for controlling the application of pressure to the work support.

19. In a machine of the class described, a work support movable between workreceiving and work-clamping positions, a supporting member therefor, connections between the work support and its supporting member controlled by the thickness of the work, means for starting the machine, means for applying final pressure to the work, and means operable by the starting means and movable relatively to the pressure applying means for controlling the application of pressure to the work support. 20. In a machine of the class described, a work support movable between work-receiving and work-clamping positions, and means for securing uniform pressure on work of various thicknesses at the time of fastening insertion comprising means for moving the support to final work clamping position before the machine is started, a work-controlled connection between said moving means and said support, and fixed means for determining the point at which the connection is made. l

21. In a machine of the class described.k a work abutment against which the work may be clamped, a work support movable between work-receiving and work-clamping positions, means for keeping the work on the support normally pressed against said abutment, power means for moving the work support toward and from said abutment, and means for locking the work support to said power means prior to the starting of the machine. 22. Ina machine of the class described, a work abutment against which the work may be clamped, a work'support movable between work-receiving and work-clamping positions, means operative whileY the machine is at rest for yieldingly pressing the work `on the support against the abutment, and

treadle-operated means for operating the work support to apply final pressure to the work.

23. In a machine of the class described. a work support movable between work-receiving and work-clamping positions, a supporting member therefor, means operative for pressing the work support toward workclamping position, a treadle, means for locking said work support to its supporting member, and means actuated by said treadle and movable relatively to said pressing means for ycontrolling the locking means.

24;. In a-machine of the class described. a jack spindle movable between work-receiving and work-clamping positions, a supporting member therefor, manually operable meansV for pressing the spindle 'and its supporting member toward work-'clamping position, means for moving the spindle relatively to its supporting member, and camcontrolled means for locking the spindle to its supporting member as said support moves under the action of said pressing means. v

25. In a machine of the class described, a

Work abutment, a work support movable between work-receiving and work-clamping positions, a supporting member therefor, means for pressing the work on the support normall in' contact ,with said abutment, means for, locking the work support to its supporting member, a treadle-controlled cam for controlling said locking means, and

`means forrmoving the supporting member manually operable means controlled bythe work introduced between the support and abutment for applying finalV clamping pressure on the work.'V l

27. In a machine of 'the class described, va work support movable between work-receiving and work-clamping positions, a spring for holding the work support normally in work-clamping position, said work support being so mounted that it may b eV readily depressed directly by tlie workman" inplacing work thereon, and manually operated means for pressing the support toward workclamping position.

2S. Ina machine ofthe class described', a

work support movable between work-receiving and work-clamping positions, a spring` for holding the work support normally in work-clamping position, and manuallyuoperated means for yieldingly applying final clamping pressureto the work on the support. y

29. vIn a machine of the classdescribed, a work support movable between work-receiving and work-clamping positions,` means for holding the support normally inl work-- clamping position,and yieldingly operated means for causing the application of maximum clampingpressure on thegwork prior to the operation of the machine..

30. Inra machine of the class described, a jack spindlemovable between work-receiving and work-clamping positions, means for measuring the work, and manually operable means for applyingk final work-clamping pressure constructediand arranged adjustably to controlsaidmeasuring means.

3l., In a machine of the class described, a jack spindle, a supporting member therefor,

means for measuring the work onthesupport, power means' for operating the support,vand means for applying iinal workclam'ping pressure, comprising means for securing the support in fixed relation to its supporting member during a plurality of operations of said power means, the construction and arrangement being such that the work is measured and has final clamping pressure applied thereto before the machine is started. L

32. In a machine of the lclass described, woi'k supporting mechanism comprising relatively movable parts, manually operable means for moving said mechanism, means independent of said manuallyV operable means for effecting relative movement of the parts of said mechanism to measure the work, and controlling means for said measuring means including a member stationaiily mounted on the machine frame.

33. In a machine of the class described, work supporting mechanism comprising relatively movable parts, manually operableY means for effecting relative movement of said parts to measure the' work, manually operable means for moving said mechanism,

and means mounted independently of said manually operable means for controlling the extent of relative movement of said parts.

34. In a machine of the class described,

work supporting mechanism comprisingV relatively movable parts, manually operable means forV effecting relative movement of',

said parts to measure the work, and means intermediate between the parts of said mechanism Vfoi-'securing saidparts againstV relativelmovement arranged to operate immediately following actuation of the means for Veffecting relativey movement of said parts. K

35. In a machine of thejclass described,

work supporting mechanismV comprising.V

relatively movable parts, manually operable lmeans for effectingA relativemovement of said partsto measure the work, means for operating said mechanism, manually operable means for applying` final work` clamping pressure on the work, and means inde'- pendent oif the operating means for securing s: id parts against relative movement .during a plurality of vcycles of operation of the machine,

3G. Ina machine ofthe class described, work supporting mechanism comprising relatively movable parts, manually operable means for effecting relative movement of said parts operable to lift the work holding part of the support to work clamping position, means for operating said mechanism,

manually operable means for applying work clamping pressure to said mechanism and means for securing said parts against relaing means.

37. In a machineofthe class described, work supporting mechanism comprising relatively movable parts, manually operable means for effecting relative movement of said parts operable to lift the work holding tive movement upon actiiation'of the operat-y part of said mechanism to Work clamping position, means for operating said mechanism comprising a member connected thereto, means for imparting to said member a movement different from its operating movement, and means for applying work clampingpressure to the work support upon such movement of said member. 'i

38. In a machine of the class described, work .supporting mechanism, comprising relatively movable parts, means for operating said mechanism comprising a substantially horizontal member arranged to uphold the work supporting mechanism, means for applying final work clamping pressure to said mechanism constructed to raise said member positively, and means for securing said parts together upon operation of said pressure applying means.

39. In a machine of the class described, a work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the work on the support, manually operable means for moving the supporting member, and means supported,independently of said manually operable means 'for securing the work support to its supporting member upon operation of the manually operable means.

40. In a machine of the class described, a Work support movable between work receiving and work clamping positions, a supporting member therefor, 'means comprising a spring for effecting movement of the support relative to the supporting member to measure the work, manually operable means for applying final work clamping pressure, and means independent of the manually operable means for securing the support against movement relatively to its supporting member.

41. In a machine of the class described, a work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the Work on the support, manually operable means Jfor moving the supporting member, means for securing the Work support to its supporting member upon operation of the manually operable means, a slide for oontrolling the securing means, and means for adjustably positioning said slide.

42. In a machine of the class described, a work support, a supporting member therefor, said work support being movable relatively toits supporting member to measure the work on the support, manually operable means for moving the supporting member,

-means for securing the work support to its supporting member upon operation of the manually operable means, a member for controlling the securing means, and means for operating the controlling member upon actuation of the manually operable means.

43. In a. machine of the class described, a work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the work on the support, manually operable means for moving the supporting member, means for securing the work support to its supporting member upon operation of the manually operable means, a member for controlling the securing means, a yielding oonnection between the controlling member and said manually operable means, and means for adjustably limiting the movement of said controlling member upon actuation of the manually operable means.

44.v In a machine of the class described, a work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the work on the support, manually operable means for moving the supporting member, pawl and ratchet connections between the work support and its supporting member for securing them together, and means operated by the manually operable means for controllinosaid connections.

45. In a machine of the class described, a work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the work on the support, manually operable means for moving the supporting member, means for securing the work support to its supporting member at a predetermined point in the upward movement of the supporting member, a member for controlling the securing means, and means for raising the controlling member when the supporting member is again lowered-by the release of said pressure applying means thereby to disconnect said work support from its supporting member at a point above its point of connection thereto.

46. In a machine of the class described, a work abutment, a work support, manually operable `means for applying final work clamping pressure on the support, and means independent of said manually operable means for pressing the work on the support against the abutment.

47. In a machine of the class described, a work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the work on the support, manually operable means for moving the supporting member, means operable upon movement of the supporting member to lock the work support thereto and means independent of the supporting member for controlling the locking means.

48. In a machine of the class described, a Work support, a supporting member therefor, said work support being movable relatively to its supporting member to measure the Work on the support, means for securing isoV the work support to its supporting member, manually operable means comprising a spring for 'applying final clamping pressure to the work sup-port, and means interposed between the supporting member and said spring for automatically operating the work support.

49. In a machine of' the class described, a work support, a supporting member therefor, said work support being movable relatively toits supporting member to measure the work on the support, manually opera-ble means comprising a springV for applying final clamping pressure to the work support, means interposed between the sup-porting member and said spring for automatically operating the work support and constructed to compensate for variations in the thickness of' apiece of work, and means for securing the work support and its supporting member 1 in locked relation during the operation of said work support operating means. 'i

50. In a machine of the class described, work supporting mechanism comprising parts normally 1 relatively movable, means for effecting relative movement yof said parts arranged to lift the work holding part of the support to work clamping position and thereafter'to apply work clamping pressure vto said mechanism, means for operating said mechanism, and a locking device for securing said parts against relative movement upon actuation of the operating means.-

In testimony whereof I have signed my name to this specification.

GEORGE GODDU.

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