US2815681A - Filing or the like machine - Google Patents

Description

Dec. l0, 1957 D. J. WILLIAMS 2,815,681

' FILING 0R THE LIKE uAcHINE Filed Aug. 15. 1951 a shears-sneer 1 21 TE IJ i- HHIHIIIN Gttornegs Dec. 10, 1957 f l n. J. WILLIAMS 2,815,681

FILING on THE LIKE MACHINE Filed Aug. 15. 1951 2 sheets-sheet 2 Zmventor Pam@ Z J WL'Zh/m United States Patent A.C

FILING R THE LIKE MACHINE Daniel J. Williams, Fairlield, Conn. ,j Application August 15, 1951, Serial No. 241,950

3 Claims. (Cl. 74-,600)

This invention relates to filingand lappingandthelike machines wherein the working tool is 1jecip1jocat-ed, and' more particularly to the reciprocating orQstroke `mechanismY of such machines.

A preferred embodiment of the invention is 4illustrated herein. The specic structure shown anddescribed has a powered shaft and crank pin driving a reciprocating tool holder through the medium of a cross slide. However, it should be understood that the invention is not limited to the specific embodiment illustrated, but instead has its scope delined inthe appended claims.

object of the invention is to provide an improved reciprocating ling machine with adjustable stroke mechanism characterized by a minimum unbalance of the crank over a wide range of adjustment, thereby making for smoother and quieter operation, with less vibration.

Another object of the invention is to provide in a reciprocating filing machine as above characterized, improvedand simplified damper means associated with the reciprocating parts, to Afurther enhance the smoothness and quietness of operation.

vStill another object of the invention isfto provide an improved filing and lapping maohinein accordance with the foregoing, which is simple and .economical ,to con,- struct and reliable in operation` throughout an extended period of use.

A feature of the invention resides in the simplicity, compactness and small size of the stroke-adjustment mechanism.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Figure 1 is a side view of an improved filing machine embodying this invention, shown partly in elevation and partly in vertical section.

Fig. 2 is a fragmentary view of the machine, showing the novel stroke-adjusting mechanism in side elevation.

Fig. 3 is a side view, enlarged, of the stroke-adjusting mechanism of Fig. 2, shown partly in side elevation and partly in vertical section.

Fig. 4 is an elevational view of the stroke adjusting mechanism, showing its inner face.

Fig. 5 is a fragmentary view, partly in elevation and partly in Vertical section, of the crank pin, cross slide and guide rod of the reciprocating mechanism.

Referring to Fig. l, the improved tiling machine shown therein comprises a housing arranged to function as a base or pedestal, having an upstanding portion or column 11 at its rear. Reciprocable on the base 10 and column 11 is a guide rod 12 carried in bearings 13, 14 and 15, said rod having upper and lower tool support arms 16 and 17, respectively provided with tool holders 18 and 19 arranged to mount a file or other tool 20.

On the base 10 between the upper and lower arms 16 and 17 a table 21 is provided, adjustably carried for tilting in all directions by sector members 22 and 23 in conjunction with a supporting structure 24 secured to the front upper portion of the base.

The lower tool-support arm 17 is connected with a q ce 2,815,681

Patented Dec. 10, 1957 secondv guderod 2,5 slidably carried by belrlgS .25, and 27 on the housing 10.

Interconnecting the guide rods 12 and 25 is a cross slide 2,8, which is disposed within the upper front portion of th@ housing 10, being enclosed by vertical and horizontal partitions 29 and 30 respectively, said partie tions forming withthe upper housing, wallsfa lnbrication chamber 31.

Referring to Fig. .3, the housing 10 has Va horizontal powered shaft 32 driven by a pulley 33 and belt 34. A hand wheel 35 is connected with `the pulley 33 ,to enable the shaft 32 to `be adjustably turned manually.

In accordance with the present invention a novel, im` proved and simplified ,adjustable stroke crankmeclianismis `provided on ,the powered shaft 3 2 to impart a Irecipf rocating movement to the guiderrods ,12.and 25 andthe tool 20 Vin response to turning of the vshaft 32, saidrnechanism being characterized by a minimum of dynamic:- unbalance throughout its range of adjustment., This or member 38 having the shape of a sector, saidmemben being angularly movable about the pivot and carrying a crank pin 39 at a point removedffrom .the pivot and normally out of line with the shaft 32, Aand having al wear shoe39a ofhardened steel surroundingrandrotatably mounted on the pin.

Referring to Fig. 5, the crank pin 39 is arranged to4 be received in, and to engage the slot 28a incrosfs slide 28.. For -the purpose of laltering the eccentricity of the crank pin 39 ,with respect to the shaft 32, ,theV sector,

v member 38 is provided with acurved rack 40 engaged by apinion 41 mounted on a shaft 42 passing through4 the powered shaft 32 andfcarrying at its frontend .an adjusting A.wheeli anda manually operableflock nut4,4.

The sector member 3S has an undercut slot 45, Fig. 3,'

here shown in the shape of a T, receiving a locking key 46 carried by the inner end of the shaft 42.

By the above organization, when the lock nut 44 is loosened, the pinion 41 may be rotated by turning the adjusting wheel 43, thereby altering the angular position of the sector member 38 and varying the eccentricity of the crank pin 39 with respect to the shaft 32. Thus the stroke of the crank mechanism is altered, changing the stroke of the guide rods 12 and 25 and the stroke of the tool 20. The sector member 38 may be locked in any adjusted position by merely tightening the lock nut 44 which causes the key 46 to bear against the walls of the slot 45.

I have found that, by the provision of the sector-shaped member 38 carrying the crank pin 39, in conjunction with the eccentrically located pivot 36 and recessed wheel or counterweight 37a, a minimum amount of dynamic unbalance is had for various adjusted positions of the member corresponding to different lengths of stroke,

In Fig. 4 the sector member 38 is located to dispose the crank pin 39 a maximum distance from the powered shaft 32. If, referring to Fig. 4, the pinion 41 is rotated clockwise it will cause the crank pin 39 to approach the axis of the powered shaft 32, reducing the eccentricity or stroke of the mechanism. The center of inertia of the sector 38 will not, however, shift as much as the distance moved by the crank pin 39 during any adjustment of the sector, as would otherwise be the case if the crank pin were carried on a straight slide having purely translational movement instead of pivotal movement. Thus, the amount of unbalance occasioned by adjustment of the sector member 38 is not as great as would occur where a straight slide is used to adjust the position. of a crank pin, and as a consequence a desirable smoothness and quietness of operation is obtained, with a minimum of vibration and wear on working parts.

For the purpose of damping the movement of the guide rods 12 and 25 to further improve the quietness and smoothness of the machine, cups 47 are secured to the underside of the partition 30, forming oil chambers 48 around the lower ends of the guide rods. Ports 49 are provided in the oil chambers 48, communicating with the oil'chamber 31.` In the operation of the filing machine, oil which is in the chamber 31 will 110W into the smaller chambers 48, lling these chambers, and such oil will be alternately forced partially out of the charn bers 48 and then sucked into the chambers 48 during reciprocating movements of the guide rods 12 and 25. By this action a hydraulic damper is provided, acting on th'e guide rods 12 and 25.

'Variations and modifications may be made within the scope of the claims and portions of the improvements may be used without others.

' I claim:

' 1. In a device for reciprocating a member, means for reciprocating the member comprising a power-driven shaft; a pivot eccentrically carried by said shaft; an arm mounted for angular movement about said pivot, said arm having an undercut slot; a crank pin carried by the arm at a point spaced from the pivot; means connecting the member to the crank pin to reciprocate the member in response to travel of the crank pin; and means including a key in the undercut slot and a tie rod connected with said key and passing through the power-driven shaft, for drawing said key inwardly and holding said arm in different angular positions about the pivot whereby different eccentricities of the crank pin with respect to the shaft can be maintained.

2. A device for reciprocating a member comprising a crank pin; connection means between said pin and member to reciprocate the latter in response to travel of the pin in a closed path; a power-driven shaft; a pivot eccentrically carried by said shaft; a sector-shaped member carried by the shaft, mounted for angular movement about said pivot, said sector-shaped member having a curved rack and an undercut slot coextensive with the rack, and carrying the crank pin at a point spaced from the pivot; a pinion engaging the rack; a shaft carrying the pinion, passing through the power-driven shaft whereby rotation of said pinion shaft positions the sector in different angular positions about the pivot to vary the eccentricityof the crank pin with respect to the powerdriven shaft; a key connected to said pini-on shaft for axial movement therewith, occupying the undercut slot of the sector member, said slot having a wall spaced from the bottom of said slot to limit movement of said pin in a direction axially of said pinion shaft; manually operable means for turning the pinion shaft; and manually operable means for axially moving the pinion shaft to tighten the key against a wall of said slot.

3. The invention as defined in claim 2 wherein a iiywheel having a flat peripheral portion is mounted on said power-driven shaft and is provided with a recess in said flat portion, and wherein said pivot and sectorshaped member are mounted in said recess whereby a minimum of dynamic unbalance is obtained.

References Cited in the file of this patent UNITED STATES PATENTS 241,488 Gould et al May 17, 1881 421,297 Mills Feb. 11, 1890 731,116 Myer Jan. 26, 1903 811,426 Mitchell Ian. 30, 1906 1,194,414 Olson Aug. 15, 1916 1,230,779 Rearwin a- June 19, 1917 1,322,873 Brull Nov. 25, 1919 1,609,843 Stimpson Dec. 7, 1926 1,636,729 Yarrington July 26, 1927 1,779,981 Nickerson Oct. 28, 1930 1,821,787 Black Aug. 19, 1931- 1,847,048 Orr Feb. 23, 1932 l1,917,701 l ACrites et al July 11, 1933 2,081,373 v Viscasillas May 25, 1937 2,508,390 Hungerford May 23, 1950 2,551,359 Bannow et al. May 1, 1951 2,567,974 Scott Sept. 18, 1951

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