US2236881A - Worktable positioning means - Google Patents

Description

Ap ril 1, 1941.

J. M. RUSNAK WORKTABLE POSITIONING MEANS Filed July 20, 1938 4 Sheets-Sheet 1 INVENTOR JMRufl/zak TTORN EY A ril 1, 1941. J. M. RUSNAK )VORKTABLE POSITIONING NBA? 4 Sheets-Sheet 2 Filed July 20, 1938 4 Sheets-Shget- 3 an @m J. M. RUSNAK WORKTABLE POSITIONING MEANS April 1, -19 41.

Filed July 20, 1938 April 1, 1941. J. M. RUSNAK WORKTABL E POSITIONINC; MEANS Filed July 20, 19:58

4 Sheets-Sheet 4 lm llm n van; vun

Z n h INVENTOR JMAwwa'k Patented Apr. 1, 1941 2,236,881 WORKTABLE 'POSlTIONING MEANS John M. Rusnak, West Hartford, Conn, assignmto Niles-Bement-Pond Company,

Hartford,

Conn... a corporation ofNew Jersey Application July 20, 1938, Serial No. 220,296

Claims.

This invention relates to precision boring machines and particularly to an improved means for positioning the work supporting table of a boring machine to predetermined locations in directions at right angles to each other and normal to the axis of rotation of the boring tool of the machine.

An object of the present invention is to provide precision locating means for the worktable over a wide range in two directions normal to each other by improved easily operated means facilitating the determination or the positions to which the table is moved in a. manner eliminating the danger of injury to the measuring devices.

A feature of importance of the invention is that the initial setting of the positioning mechanism for successive work pieces is facilitated.

'r'ind another feature that is advantageous is that the position determining means for the table do not require the insertion and removal of end measures, all parts of the present indicating and positioning mechanism being retained at all times in position upon the machine.

Another object of the invention is to provide an improved micrometer and operating means and indicating means therefor and also improved means to clamp the micrometer spindle accurately in predetermined adjusted positions.

With the above and. other objects in view, the invention may include the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a part of this specification, I have shown the invention embodied in a standard form of vertical boring machine but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

In the drawings:

, Figure 1 is a front elevation of the principal parts of a precision boring machine having the present invention applied thereto.

Fig. 2 is a front elevation on an enlarged scale of the worktable of the boring machine showing the positioning means. for the table in one direction.

Fig. 31s a front elevation in section and on an enlarged scale of some of the parts shown in Fig. 1.

Fig. 4 is a plan view of a portion of the positioning and indicating mechanism for the table shown in Figs. 1, 2 and 3.

Fig. 5 is a plan view of a portion of the operating mechanism for the positioning mechanism shown in Fig. 4 with the parts in another operative position.

Fig. 8 is a transverse sectional view taken upon a the plane of line 8-8 of Fig. 7 and Fig. 9 is a transverse sectional view taken on the plane of line 99 of Fig, 4.

In the above-mentioned drawings there has been shown but one embodimentof the invention which is now. deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention. 1

Briefly and in its preferred aspect, the invention may include, first, a base having a table movable preferably in a horizontal plane in two directions, there being a saddle member interposed between the machine base and the table, the saddle being movable in one direction on the base and the table being movable on the saddle in a direction at right angles thereto; second, a rotat'ing tool such as a boring tool movable vertically on a fixed axis within a suitable spindle and head; third, bars mounted in the'table and. in the saddle built up of individual members and having spaced abutments thereon at precisely equal distances apart; fourth, contacting members mountedrespectively in the base and saddle oscillatable into and out of engagement with the abutments on their respective bars; fifth, precision means for moving the contacting member for each of the abutment bars; sixth, means to indicate the positions to which the contacting members have been adjusted; seventh, zero setting means for the contacting members; eighth,

' clamping means for the table and saddle in any adjusted position; and ninth, clamping means normally holding the micrometer in clamped position.

Referring more in detail to the figures of the drawings, there has been shown a machine of the general type shown in the patent to Hanson 1,323,267 granted December 2, 1919, having a movable work mounting table, the positions to which the table is moved being determined to extremely high precision.

The present machine comprises a base l0 having a column H thereon supporting a. vertically movable head l2 having a rotatable tool supporting and rotating. spindle 13. Within the lower end of this spindle I3 may be mounted any suitable boring or other tool i 4 adapted to engage work W mounted in fixed position. on the table. Upon suitable horizontal ways IS on the base it is a saddle member i6 movable toward and from the column I I and upon the saddle I is mounted the work mounting table l1 movable upon suitable horizontal ways 18 in a direction at right angles to the direction of movement of the saddle. As these members it and I1 and their movements are or may be in every way similar to the members in the above-mentioned patent, it is not thought necessary to describe them more in detail. It will be understood also that there are provided manual means to move the saddle is toward and from the column H such as the screw l9 having the hand wheel 20 upon its forward end and for traversing. the table I! transversely along the saddle Ifiby means of the screw 2i having a hand wheel 22 upon one end.

.Positioning' devices for the saddle l6 and for the table l'i are provided which are in every way duplicates of each other so that but one of these device determines the position of the table ll upon the saddle Hi In the drawings details are shown of the positioning means for moving the table I i on the saddle I6 and the description will be limited to these means. Itwill be understood that a duplicate positioning device will be employed to determine the movements of saddle IS on the base It. Y

Extending along the under side of the table ii is a longitudinal recess within which are inserted elongated bars 23 forming a central channel or groove within which are inserted a plurality of blocks 24. The bars 23 with the blocks 24 sup ported between them are shown more particularly in Figs. 7 and 8. The inner lower surfaces of the elongated bars 23 are provided with a lateral extension upon which the lower surfaces of the blocks 24 may rest and at their upper periphery the blocks may contact directly with the surface of the recess within the table ll. Each of these blocks 24 at one end is formed with a short axial extension 25 of reduced diameter and at their opposite end with a head 26 fitting the surfaces of the bars 23 and of the recess, there being an intermediate head 21 on each block 24 so that the blocks are held accurately in axial alinement. At one end of the table i1 is inserted a metal block Zilagainst which one of the extensions 25 of the blocks 24 abuts and at the opposite end of the table I'l is inserted a member 29 having a spring pressed plunger 30 bearing against the head 26 of the block 24 at that end and constantly holding the row of blocks in closely abutted position. As the blocks 24 are of preciselyequal length the end faces of the heads 28 form equally spaced abutments longitudinally along the table I! in the direction'of its movement on saddle l6 and are maintained in this position'by the spring pressed plunger 30.

1 ings.

- 2 aasaeai lines in Figs. 7 and a. This is the position assumed by the bar 3| while indicating the position of the table ii. In the position shown in dottedlines in Fig. 8 the rod 3! and its projection 32 have been oscillated from block contacting position to an inoperative position below the surface of ,the table !'i so that the table may be moved to any transverse position on the saddle it without injury to any part of the positioning mecha-' nism.

At the right hand end of the elongated bar 3i and attached thereto through means presently to be more fully described, is a micrometer measuring device having a movable member 33. As shown most clearly in Fig. 3, this micrometer comprises the movable member 33 slidably mounted within a portion of the micrometer and having an internal threaded portion engaging the screw threads of the micrometer spindle 3%. This movable member 33 is prevented from rotating during its sliding movement by engagement with a dovetail slide 35 formed in the saddle IS on which it is freely movable at all times. micrometer bracket 36 is a dial indicator 3? the movable spindle 38 of which is in alinement with the micrometer spindle 34. Movement of the micrometer spindle 34 a limited distance axially within its rotating member 45 is permitted and moves the spindle 38 of the dial indicator 3? .to rotate its pointer 40 in the usual manner.

To rotate the micrometer spindle 3 3 to move the member 33 and the elongated rod 35 to the left or right there is provided the hand wheel 3@ mounted on rotating member t5 and normally held in clamped position but adapted tobe released for rotation by oscillation of a small hand wheel 4! on-the forward end of square shaft 42. The periphery of the hand wheel 39 fits between abutments formed on a plunger 43 and a sleeve 44 housed within the bracket 36. The sleeve 4% is slidably mounted on an extension of the plunger 43 and is spring pressed toward the abutment on Y the plunger 43 by means of a light spring as shown.

Mounted for rotation with the micrometer.

spindle 34 is the rotatable member 45 on which is mounted a large diameter dial 46 graduated to fractions of an inch such as ten thousandths. The rotatable member 45 surrounds and supports the slidable member33 and 'is supported within the bracket 36 for rotation but maintained against endwise movement on suitable anti-friction bearfixed in position upon the micrometerbracket 36 in a position concentric with the dial. A zero This is for the reason that the rotary member 45' has splined within it the spindle 34 of the mi crometer so that rotation of the hand wheel 39 rotates the spindle 34. Movement of the slidable member 33 also axially moves the elongated rod 3| to which member 33 is adjustably attached at one end.

Mounted in the The dial lies closely adjacent a plate 41 a aasaesr To vary the adjustment of the bar or rod 8i relative to the slidable member 33 so that the distance between projection 32 and member 33 may be varied, rack teeth 48 may be cut into an extension 49 of the bar 3|, these teeth being adapted to engage a pinion 50 on a short cross shaft 5| mounted within the slidable member 33. Rotation therefore of the cross shaft 5i by its hand wheel 52 will traverse the slidable member 33 to 'the right or left together with the parts attached thereto as will presently be described. To clamp the rod 49 in position relative to the member 33 a screw 52 is provided threaded into the member 33 and engaging against the bar or rod 49.

Carried by the slidable member 33 is a pointer 53 the end of which lies adjacent a scale 54 secured in fixed [position to the bracket 35 in which the micrometer is mounted. In order to I facilitate reading the graduations of the dial 46 and the positions of the pointer 53 small lenses 55 and 55 may be inserted within the bracket directly above the reading positions renary adjustment of the positioning means on new pieces of work.

Closely adjacent the scale 51 fixed to the saddle i5 and on one side thereof is a short scale 58 fixed to and moving with the table II; this short scale 58 as shown may preferably be graduated to small fractional parts of an inch. Also adjacent the fixed scale 51 and on the opposite side from the short scale movable with the table I1 is a slidable member or bar 59 carrying a zero indication 50 contacting with the scale 51. This member or bar 59' by its handle 6! may be moved to any position in a direction parallel to direction of the table l1 and closely adjacent the scale 51. Clamping means 62 for this rod 59 and an operating hand wheel 63 thereforare provided in the table l1.

As shown in Fig. 3 the rod 3! at one end is attached to a member Bl loosely but in a manner to rotate the rod when member 53 is rotated. Also member 64 is attached. to a slidable intermediate member 65. Oscillation therefore of member 65 by its handle 66 will oscillate the rod 3| to move projection 32 into or out or engagement with the abutment surfaces of blocks 2|. Preferably the connection between member 55 and the rod 49 permits oscillation between limits of the member 85 sufficient to move the projection 32 into or out of operative position without rotation oi the rod 49.

In the operation of making precision adjustments of the table I! the final adjustment is always toward the rightas seen in the figures. When an abutment on a block 24 contacts withthe projection 32 and further movement to the right takes Place the rod 3| will be forced against member 64 and member 55 against member 65. Slidable member 33 will therefore be moved to the right and micrometer spindle II will move slightly to the right. The end, therefore, of the spindle 24 will abut against and move the spindle 38 of dial indicator 31 toward the right. The movement of the table l1 may then be continued until thepointer 40 of dial indicator 31 moves around to its zero position. with the parts in these positions the adjustment of the table ii to the position called for by the micrometer adjustment and the particular block engaged by the projection 32 is complete.

Manual means are provided to move the micrometer spindle 34, member 33 and parts attached thereto in a direction to force the spindle 35 against the end of indicator spindle 38. This means is in the form of a small lever 61 which oscillates its shaft 68 and forces plunger 53 ax ially in one direction. A spring 10 bearing against an end of the plunger 59 returns the plunger to initial position when lever 51 is re-' leased. Plunger 69 engages within a wide an nular recess formed in the spindle 34 so that work piece the work piece is secured to the table I1 as shown at'W. The work piece W may be linedv up with reference edges thereon disposed parallelly to the directions of movement respectively of the table l1 and saddle l8. The position of any one of the zeros on scale 51 relative to the graduations on scale 58 is then noted. As the scale 51 is mounted on saddle l5 and l! parallel to the rod 3| one of its zero lines may be employed to indicate the position of the projection 32. When a zero line 01' scale 51 is in alinement with a zero line on scale 53 the proiection is closely adjacent one 01' the abutments on block 28. The scale 58 as shown in Fig. 5 indicates that the projection 32 is spaced axially from one of the abutments on blocks 24 a distance of three-quarters of an inch. To adjust the axial position of the projection 32 so that with the worlr piece W in position for its first operation the projection 32 will contact abutment on a block 24, hand wheel 52 is rotated-to move rod 49 intermediate member 54 and the rod 3i toward the right. To determine the amount of this movement a scale is provided on the member 35. The necessary adjustment is made when the graduation on the scale on member in contact with its zero line corresponds to the graduation .of scale 58 contacting with a zero on scale 51. The 'rod 49 can then clamped by hand wheel 52 so that rod 3| and parts attached thereto will move withthe memcrometer on said support having its spindle parallel to the direction of movement 01' said table,

I a rod within said support connected to the spindle of said micrometer and having a projection at one end thereof, means to oscillate said rod to move said projection into and out of abutment ensas s position, and means to vary the axial adjustment between the micrometer spindle and the projection Y 2. Positioning means for the table of a machine tool comprising in combination, a support, a table movable thereon, members having equally spaced abutments thereon mounted on and movable with said table, a rod mounted within the support for limited axial movement parallelto the-direction of movement of the table, an abutment contacting projection at one end of said rod, a micrometer mounted on said support adjacent the opposite end of said rod and having its spindle in alinement with and connected to said Y rod, and means to adjust the axial position of said projection and rod predetermined distances die in alinement with and connected to said rod, means to oscillate said rod to move said projection into and out .otabutment engaging position, and means to adjust the axial position of said projection and rod predetermined distances toward and from said spindle.

o posits end of said rod and having its spin-.

s. Positioning means for the table of a machine tool comprising in combination, a support, a table movable thereon, members having equally spaced abutments thereon mounted on and movable with said table a rod mounted within the support for limited axial movement parallel to the direction of movement of the table, an abutment contacting projection atone end oi. said rod, a micrometer mounted on said support adjacent the opposite end of said rod and having its spindle in alinement with and connected to said rod, an elongated scale on said support extending parallelly to. the direction of movement of said 'tab1e,.afixed zero indicia on said table, and

means to adjust the axialv position of said projection and rod predetermined distances toward and from said spindle.

5. Positioning means for the table or a machine tool comprising in combinatibn, a support, a table movable thereon in a straight line, alined abutting members having abutments thereon mounted'on and movable with said table, said abutments being disposed transversely of said members-and equally spaced axially thereof, an-

Jol'm' M. RU SNAK.

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