US 2095203 A
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Description (OCR text may contain errors)
Oct. 5, 1937. w -r5 v 2,095,203
POWER TiaANsMITTER Filed July 27, 1955 2 Sheets-Sheet 1 Sn UQW Uilbur cl Pees Oct. 5, 1937. w. J. PEETS POWER TRANSMITTER 2 Sheets-Sheet 2 Wilbur cl Pee apart.
Patented Oct. 5, 1937 UNITEDSTATES PATENT OFFICE Wilbur I. Peets, Elizabeth, N. J. assignor to The .Singer. ,Manufacturing Company, Elizabeth,
N. J., a'corporation of New Jersey .Application July 27, 1935, Serial No. 33,547 4 Claims (01. 74-611),
This invention relates to treadle-controlled power-transmitters such as are customarily used on sewing machine power-tables to enable the individual sewing machine operators to start, stop and control the speed of the respective sewing machines which are driven bypower from a lineshaft running lengthwise of the power-table; there being a power-transmitter disposed intermediate each individual sewing machine and the power-table line-shaft.
A power-transmitter of the type in question commonly comprises a live friction clutch-disk which is belt-connected to the line-shaft and runs continuously. A driven clutch-disk and beltpulley is arranged to be shifted by a treadle connection into and out of driving relation with the live clutch-disk; the lastmentioned pulley being belted tothe sewing machine.
The present invention has'for an object to provide aheavy duty power-transmitter of the type in question which is of simple and: inexpensive construction and which may be safely operated without tiring effort by the operator.
Another ob-ject of the invention is to provid the transmitter with suitable adjustments facilitating its installation with power-tables and sewing machines 'of various types. Further, the invention has for an object .toprovide a powertransmitter which is easy to assemble and take Still further, the invention has for an object to provide the transmitter with a simple, efficient and practical guard for the belt-pulley running to the machine to be driven.
With the above and other'objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings. of a preferred embodimentof the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the. art.
In the accompanying drawings Fig. 1 is a front elevation, partly in section, of a power-transmitter embodying the invention. Fig. 2 is a side view of the bearing sleeve for the shaft-connected driven clutch and belt-pulley elements of the transmitter. Fig. 3 is an end elevation of the transmitter. Fig. 4 is a section on the line 4-4, Fig. 3; Fig. 5 is a section on the line 55, Fig. 1. Fig. 6 is a transverse section through the split bearing for the driven elements of the transmitter and Fig. 7 is a view of the transmitter beltguard. V
Referring to the drawings, I represents the top board of a conventional sewing machine power- .and a rearward extension 4 having spaced downwardly extending ears 5, 5.
'Fulcrumed in the ears 3, 3 are the alined pivot-.
studs 6, 6 projecting inwardly from the upwardly extending ears 1, l of the inverted U-shaped transmitter frame including the spaced downwardly extending arms 8, S-connected at their upper ends by the'cross-bar it which is of inverted L-shaped section, as shown in Fig. 5."
Pivotally hung at H from the ears 5 is the screw-threaded rod i2 which passes through the slot IS in a rearwardly extending portion l4 of the cross-bar Ill and is adjustably clamped to the portion M by the top and bottom adjusting and clamping nuts IS. The purpose of this adjustment is to swing the transmitter frame about its pivots 6, 6, to properly tension the fiat belt I6 which drives the transmitter from the usual power-table line shait (not shown).
The arm 9 of the transmitter frame is provided at its lower end with a split bearing including a removable side bearing cap H; the split bearing being bored out horizontally at I 8 to form a bearing for the rotatable and endwise slidable sleeve I9 to be described. Thearm-B of the transmitter frame is bored out at 29str'ict1y coaxial with the bearing bore I8. I
Mounted in the bore 20 of the arm 8 is the stationary cylindrical stud 2! having a head 22 and a threaded extremity 23. Assembled on the stud 2| are the spaced conventional ball-bearings '24,
24 andintermediate spacing sleeve 25; the inner race members of the ball-bearings together with the sleeve 25 being clamped between the head 22 pulley 28 for the driving belt I6; the center line or crown 28 of the pulley 28 being disposed substantially centrally of the space between the ballbearings 24 to evenly distribute the pull of the belt l6. between the ball-bearings. The stud 2i and sleeve 25 are provided with lubricant ducts 29, 3D, respectively, through which lubricant may be injected into the ball-bearing cavity within the pulley 28 by means of the grease-cup 3| screwed onto the threaded end 23 of the stud 21. The live clutch-disk 21 is faced with a suitable friction-clutch-facing 32.
The removable cap I! of the split bearing carried by the arm 9 of the transmitter frame is formed in its bearing face with a helical groove 32 to receive the helical thread 33 on the sleeve 19; this construction being like that disclosed in the Peets et a1. Patent No. 2,004,055, dated June 4, 1935.
Journaled on ball-bearings 34 in the sleeve I9 is the shaft 35 connecting the driven clutch-disk 36 and belt-pulley 3'! carried at the opposite ends of such shaft; the pulley 31 being connected by the belt 38 to the machine to be driven. Clamped to the inner end of the sleeve I9 is the radial clutch-operating arm 39 to be connected by the usual treadle-rod (not shown) to an operating treadle. The arm 39 is also connected by the recovery spring 4! to a spring-anchorage arm 42 having a slot 43 embracing the supporting screw 44 for the brake-shoe E which is prevented from turning on the screw 44 by means of the upwardly projecting ears 45 at opposite sides of the crossbar It]. The spring anchorage arm 42 is, in part, curved concentrically with the axis of the shaft 35 and the slot 43 is similarly curved and has a terminal portion 47 of reduced width entered by a clamping screw 48. Thus the anchor arm 52 may be circularly adjusted on the transmitter frame arm 9 to suit the operative position of the radial arm 39 relative to the sleeve i9. The advantages of this construction are fully explained in said Patent No. 2,00%,055.
The split bearing for the sleeve #9 is formed with an annular end face Q9 and a circular rib 50 projecting from the plane thereof. Secured to the split-bearing end-face 39 by screws 5| is the upper ring-like end of a pulley-guard supporting arm 52 bent at its lower end to provide a horizontal portion 53 and a short ofiset vertical portion 56 spaced from the long or main vertical portion of the arm. A pair of trough-shaped guard members 55 for the pulley 31 and belt 38 are facially frictionally pivoted at 55 on the arm 52 and its short offset terminal portion 54; the side elements 5'! of the guard members 55 being frictionally pressed flatwise against the arms 52 and 54 by the spring Washers 55. The two similar edgewise curved side elements 5? of each guard member 55 have tongues 58 which are bent at right angles to the plane of the respective side section 51. A flatwise curved element 57 is spot- Welded to the tongues 58 of the side sections, as shown in Fig. 4. These guard members 55 may be adjusted independently of one another about their common pivotal axis 55, and the arm 52 may be circularly adjusted about the axis of the pulley 31; the arm 52 having arcuate slots 59 therein for the fastening screws 5|. The rib 5E! freely fits the large circular aperture 55 in the arm 52 and provides a bearing about which the entire pulley guard assembly may be adjusted. A pair of belt-retainer arms 6| are coaxially frictionally pivoted at 62 on the arm 52 and have angularly bent terminal portions 63 which extend across the grooved face of the belt-pulley 31 and prevent the belt 38 from dropping out of the pulley groove when such belt is removed for any purpose from the pulley of the machine being driven.
The invention is not to be understood as limited to the details of construction and relative arrangements of parts of the particular embodiment of the invention shown and described, as various modifications of such details and relative arrangements of parts may obviously be made by those skilled in the art within the scope of the invention.
Having thus set forth the nature of the invention, what I claim herein is:-
1. The combination with a frame member having a shaft bearing formed with an annular end face, of a sheet-metal pulley-guard supporting arm formed at one end with a ring-like portion secured flatwise to said end face, said pulleyguard supporting arm being bent flatwise of itself at its other end to provide a spacing member and a short terminal portion parallel to the main portion of said supporting arm, a pair of troughshaped pulley-guard sections having spaced side walls which are pivoted in overlapping relation with said supporting arm and its short offset terminal portion, and spring means to press together the overlapping portions of said supporting-arm and pulley-guard sections.
2. The combination with a frame formed with a shaft bearing having an annular end face and a circular rib projecting from the plane of said face, of a pulley-guard-supporting arm having at one end an aperture receiving said rib, means adjustably mounting said arm on the end face of said bearing for circular adjustment about said rib, a pair of arcuate pulley-guard sections having overlapping portions, and a hinge pin pivotally connecting said overlapping portions to said sup- 1 porting arm for independent swinging adjustment.
3. The combination with a frame formed with a bearing having an end face, of a pulley-guardsupporting arm having long and short parallel portions connected by an intermediate transverse portion, means mounting the long portion of said arm on the end face of said bearing for circular adjustment about the axis thereof, a pair of arcuate trough shaped pulley-guard members having spaced parallel side-walls overlapping the spaced parallel portions of said arm, and means hinging said side-walls to said spaced parallel portions of said arm.
4. A pulley-guard comprising a sheet-metal arm formed at its upper end with a circular aperture and one or more arcuate slots concentric with said aperture, said arm being bent at its lower end to provide a spacing member and a short terminal portion parallel to the main portion of said arm, a pair of similar arcuate guard sections of troughshaped section having parallel side-walls which overlap, and means pivoting said guard sections to said arm and its short terminal portion.
WILBUR J. PEETS.