US1314511A - Ptanooxaph co - Google Patents

Description

A. H. DE VOE. HANGER ADJUSTING MEANS FQR POWER TRANSMITTERS.

APPLICATION FILED OCT-30. l9l8- Patented Sept. 2, 1919.

2 SHEETS-SHEET I.

INVENTOR A RNEY \NB COLUMBIA PLANOGRAPII cm. WAIIHNG ION, D. c.

Patented Sept. 2, 1919.

2 SHEETSSHEET 2- INVENTOIRI A. H. DE VOE. HANGER ADJUSTING MEANS FOR POWER TRANSMITTERS. APPLICATION FILED OCT. 30. I918.

THB CGLUIIIIA PLANOGIAPN 0-, WASHINGTON, D- C.

- M W a H W j Z (6 W a 1 M M M P n z N 4 I :1 a z 1 1 a i 1 j j w 4% a UNITED STATES PATEN T OFFICE ALBERT H. DE VOE, 0F WESTFIELD, NEW JERSEY, ASSIGNOR T0 THESINGER MANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

HANGER-ADJ USTIN G MEANS FOR POWER-TRANSMITTERS.

Specification of Letters Patent.

1918. Serial No. 260,252.

To all whom it may concern Be it known that I, ALBERT H. DE Von, a citizen of the United States, residin at Westfield, in the county of Union and tate of New Jersey, have invented certain new and useful Improvements in Hanger-Adjusting Means for Powar-Transmitters, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a means for adjusting the pulley-hanger of a power-transmitter, such as that shown in my eopending application Serial No. 225,935, filed April 1, 1918, of which this application is a division.

The present invention has for an object to provide means for practically instantaneously varying the driving tension of the belt of a sewing machine by adjustment of its driving pulley hanger. Another object is to provide such a means which will remain in adjusted position, without requiring any securing means, but which if desired can be fixedly held. A further object is to provide a release for the belt when not in use which has an invariable movement irrespective of the belt-tensioning movement. A still further object is to provide a single actuating means for varying the driving tension of the belt and for releasing the belt when not in use.

In the accompanying drawings, Figure 1 is a leftside elevation of a power-transmitter. Fig. 2 is a rightside elevation of the same. Fig. 3 is a front view of the transmitter, partly in section. Fig. 4 is a bottom plan view with the pulleys removed and one arm of the transmitter frame broken away.

Referring to the drawings, 1 represents a table-top or other suitable support to which is secured the bracket 2 formed at one side with a lug 3 in which is fixed a horizontal rod or pin 4. Slidably mounted in the apertured lugs 5, 5 at the other side of the frame 2 is a cylindrical rod 6 which is parallel to the rod 4 and is formed between its ends with a screw-thread 7. r

The transmitter-hanger or frame is in the form of a yoke 8 including depending arms 9 and 10 of channel formation. The yoke 8 is formed with an apertured boss 11 surrounding the threaded portion of the sliderod 6 and with a laterally projecting lug 12 formed with a channel-way 13 embracing the supporting rod 4. By virtue of this construction the yoke 8 may be shifted bodily relatively to the bracket 2 rods 1 and 6.

Projecting through the wall of the boss 11 into engagement with the screw-thread 7 is the inner end of a follower-screw 14, threaded into the boss 11 and accessible through the aperture 15, Fig. 2, in the yoke 8. Pi voted within the bifurcated extremity of the slide-rod upon the screw-pin 1G is a cam-lever 17 adapted to be used as a handle to turn the slide-rod 6 and effect a relative adjustment between said slide-rod and the yoke 8. The cam-lever 17 is flattened at 18' in the higher portion of its operative edge 18 for a purpose to be described.

The driving pulley 19 of the transmitter, which is connected by means of a belt 20 with the usual constantly running line-shaft, not shown, is formed with a tubular hub 21 which is journaled externally of a tubular stud-pin 22 free at one end. and at its opposite end fixed within the bushing 23 which is secured within the apertured lower extremity of the yoke-arm 9. The hub 21 of the constantly running driving pulley is confined to turn in a fixed operative position axially of the stud-pin 22 by means of the collar 21 and the ball-thrust bearing 25, as shown in Fig. The driving pulley is formed with an annular friction driving surface 26. The ball-thrust bearing comprises two spaced rings 25 having thrust-sustaining surfaces disposed in parallel planes transversely of the axis of the stud 22 and a series of balls between said surfaces.

Mounted in spaced relation with the driving pulley 19 is a friction ring or brake disk 27 having a peripheral groove 28 within which is secured a leather friction ring 29 of large diameter; the disk 27 being formed with a hub 30 which is fixed within the apertured lower extremity of the yoke-arm 10.

The driven pulley 31, which in practice is belted to the machine to be driven, is fixed to a stub-shaft 32 journaled internally of the tubular stud 22 and carries a leather friction ring 33 complementary to the driving surface 26. The driven pulley 31 is also formed with a friction siiu'face 31. complementary to the similar surface on the brake-ring 29. Disposed in end-to-end relation with the stub-shaft 32 are the push-pins 35, 35 which serve to shift the driven pulley into engageg erlt with either the driving pulley or brakealong the parallel Patented Sept. 2, 1919. Original application filed April 1, 1918, Serial No. 225,935. Divided and. this application filed October 30,

In transmitters of the present type it is customary to provide treadle-controlled mechanism for establishing an interrupted driving relation between the driving and driven pulleys. In the present instance, the treadle mechanism is of an improved form and comprises a rock-shaft 36 journaled in the bearing lugs 12 and 37 on the hangerframe .8 and supporting the downwardly extending arms 38, 88 formed at their lower extremities with'cam-surfaces 39, 39' which are substantially parallel with each other but are inclined to the axial line of the stubshatt 82as shown in @Figs. 3 and 4.

Formed integrally with the cam arm 38 is a treadle-ar'm 40'having an apertured end 41 'inwhich is secured the usual treadle rod leading to a treadleplate (not shown). A downward pull upon the treadle arm 40. will'rock the shaft 36 and cause the camfacedarm 38 to shift the pushepin 354 inwardly, thus pressing the driven pulley forcibly against the driving pulley and etfecting the quick starting of the machine to which the transmitter is belted] l/Vhen the pressure] upon the treadle is relieved, the rock-shaft 86 is turned in the opposite direc tion through the action of the coil-spring 42 surrounding the threaded rod 43,- the bent inner end 43 of which enters'an aperture 44 in the cam-faced arm 38. The spring 42reacts against the'adjusting wing-nut 45 on the rod 43 andthe ear 46 on the yoke 8, thus effecting a shifting of the driven pulley awayfrom the driving pulley and into engagement with the brake-disk which, being of large diameter, quickly brings the driven pulleytorest without shock. The wing-nut 45, being readily accessible to the operator afiords a convenient means for securing either a light or heavytreadle action as desired." This adjustment can be made with ease by any ordinary sewing machine operator, whereas with many prior transmitters it has been necessary for the operator-to call in the services of a special machinist to effect the desired adjustment. It will of course be readily understood that theoperator may effect the stopping of the machine inclependently of the action of the spring 42 by pressing downwardly upon the forward edge of the treadle-plate, thus thrusting the treadle-rod: upwardly and forcibly lifting the treadle-arm 40 of the transmitter.

A dress-guard 47 is .pivoted to the ear 48 on the yoke" 8 and maybe swung upwardly to afford access to the driving and driven pulleys. The leaf-spring 49 secured to the guard 47 and bearing against thepointed portion50 ofthe car 48 serves toyieldingly detain the guard 47 in lowered or' raised position.

Theoiling system comprises an oil well 51 in the extremity of the hanger-arm' 9' fully supplied with lubricant'which passes in series from bearing to bearing without attention "from the operator.

It will be observed that v may be swung from full to dotted line position, Fig. 2, to quickly loosen the belt 20 when the machine is not to be used for. a time. VVhen' operations are to be resumed the camlever is restored to full line positi on, thus restoring the original degree of belt-tension previously determined by the adjustment of the yoke 8 on the rod 6. The

set sjcrew 14 may, of course,

this simple arrangement the various bear ngs of the device are plenty the cam-lever 17 q be set up to lock v the slide-rod 6 and yoke 8 intheir adjusted positions relative to'each other.

It will also be seen that movement of the cam-lever 117 on its pivot causes'a fiXed'or variable shifting movement of the rod 6 and its supported hanger 8 with respect to'the' supporting bracket 2, that is, from beltloo'sening "position to belt-tightening position or vice versa. On the other hand, a rotary movement of lever 17 on its longitudinal axis causes a corresponding rotary movement of rod 6, which efiects a variable adjustment of rod 6 with respect to the hanger and of the latter with respect to the bracket, by means of the screw thread connection 7, 14. The position of the lever 17 willfot course vary with the rotary movement given to rod 6.

The quick loosening and tightening ofthe belt without affecting the adjustment determining the degreeof tension on the belt when tightened, is' of great practical importance' in a device of the present charac'ter, as it is well known that the life of leather belting may be] materially lengthened by relieving it of tension when not in use. Then, for any reason, the machine is to remain idle for a time, a quick throw of the cam-lever 17 relieves the tension on the driving belt and also relieves the bearing pressure between'the driving pulley 19 and thel 'supporting tubular stud. ,By restoring thefcam-lever to beljttightening position the flattened portion 18, of its operative cam edge 18 receives the thrust caused by the belt tension 'and'holds the cam-lever 17 against accidental displacement. The degree'of belt tension determined by the ad justment 7 14, is thus instantly restored.

Having thus set forth the nature of the invention, what I claim herein is 1. In a power-transmitter, the combination with a supporting bracket, of a hanger, a pulley supported in said hanger, means for finely adjusting the working position of said hanger relatively to said bracket and for securing the hanger in adjusted position, and means operative without disturbing said fine adjustment to instantaneously effect a relatively large belt-tightening or loosening shift of said hanger relative to said supporting bracket, whereby the tension on the driving belt may be quickly relieved when the machine is to stand idle or quickly restored to the degree determined by said fine adj ustment when operations are to be resumed.

2. In a power-transmitting device, in combination, a supporting bracket, a hanger, a pulley supported in said hanger, a slide-rod mounted in said bracket and connected to said hanger, a fine adjustment between said hanger and slide-rod, and manually controlled means for sliding said rod relatively to said supporting bracket.

3. In a power-transmitting device, in combination, a supporting bracket, a hanger, a pulley supported in said hanger, a rod formed with a spiral screw-thread and journaled for sliding and turning movements in said bracket, a follower connected to said hanger and engaging said screw-thread, and manually controlled means for effecting turning or sliding movements of said rod, each independently of the other.

4. In a power-transmitting device, in combination, a supporting bracket, a slide-rod mounted in said bracket, a hanger carried by said slide-rod, an adjustment between said hanger and slide-rod, and means for shifting said slide-rod endwise relatively to said bracket.

5. In a power-transmitting device, in combination, a supporting bracket, a slide-rod mounted in said bracket, a hanger carried by said slide-rod, an adjustment between said hanger and slide-rod, and a cam-lever mounted on said slide-rod and reacting against said bracket for quickly effecting a relative shift of said slide-rod and bracket from one extreme position to the other.

6. In combination, a support, a pulleyhanger, an intermediate connection shiftable relatively to both of said parts, and unitary means for effecting both movements.

7. In combination, a support, a pulleyhanger, an intermediate connection shiftable relatively to both of said parts and unitary means carried by said connection for effecting both movements.

8. In combination, a support, a pulleyhanger, and an intermediate connecting element slidably shiftable with respect to one of said parts and adjustable with respect to the other by rotation.

9. In combination, a support, a pulleyhanger, and an intermediate connecting means having a shifting movement of fixed amplitude with respect to one of said parts and adjustable with respect to the other.

10. In combination, a support, a pulleyhanger, an intermediate connecting means having a shifting movement of fixed amplitude with respect to one of said parts and a variable shifting movement with respect to the other, and unitary means for effecting both movements.

11. In combination, a support, a pulleyhanger, an intermediate element, a connection between said element and one of said first-mentioned parts having an invariable shifting movement, a connection between said element and the other of said parts having a variable shifting movement, said latter connection including means for fixedly connecting the two if desired.

12. In combinations, a su port, a pulleyhanger, a connection invaria ly and variably shiftable, respectively, with respect to said parts, and means movable in difierent paths for effecting said movements.

13. In combination, a support, a pulleyhanger having separate invariable and variable shifting movements with respect to said support, and means for effecting said. movements.

14. In a power-transmitter for machines, a driving wheel, a belt for connecting the driving wheel to the machine, means for varying the driving tension of the belt, means for loosening the belt when not in use, and a unitary actuating means for both of said previously recited means.

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

ALBERT H. DE VOE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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