US1449327A - Driving mechanism - Google Patents

Description

Mar. 2@, 1923. 1,449,327

E. JAYCOX ET AL DRIVING MECHANISM Filed June 4, 1920 Patented Mar. 20, 1923.

UNITED STATES PATENT OFFICE.

EVERETT JAYCOX, OF JOHNSON CITY, AND-MELVIN OLDS, OF BINGHAMTON, NEW

. YORK; SAID OLDS ASSIGNOR T0 SAID JAYCOX.

DRIVING MECHANISl E.

Application filed June 4,

To all whom it may concern Be it known that we, Evnan'rr J AYCOX and MELVIN OLDs, citizens of the United States, residing at Johnson City and Binghamton, in the county of Broome and State of New York, have invented a new and useful Improvement in Driving Mechanisms, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates, to driving mechanisms or starting and stopping mechanisms for machines and will be herein disclosed as embodied in a mechanism designed especially for driving leather stitching or sewing machines, although it will be understood that the same mechanism can be used to advantage in driving other types of machines. In driving an outsole stitcher, welter, or similar machine whicli operates on heavy leather, an unusual load is placed on the driving mechanism when the machine is started into operation. A motor usually is selected for the driving of such a machine that is large enough to carry the normal load and give a reasonable overload capacity and it is undesirable from the standpoint of economy to use a larger motor. The starting resistance of such a machine, however, is frequently suflicient to slow down the motor to an undesirable degree, or even to sto it.

. t is an important object of the present invention to devise a mechanism that will effectually overcome this difliculty without increasing the size or power of the motor required to drive the machine. The invention also is directed to the provlsion' of a mechanism of this character which can be economically manufactured, which will be reliable in operation, will require relatively little care or attention, and will not be subject to rapid wear or deterioration.

The nature of the invention will be readily understood from the following description when read in connection with the accompanying drawings, and the novel features. will be particularly pointed out in the appended claims.

Referring now to the drawings, Figure 1 is a view partly in side elevatlon and partly in vertical cross section, of a 1920. Serial No. 386,449.

mechanism embodying the invention in the form at present preferred; and

1g. 2 1s a perspective view illustrating the connection between the motor and the fly wheel.

The construction shown comprises an electric motor 2 mounted in an inverted position on a base 3 which is secured to a support 4. Also mounted on this base, and depending therefrom, is a bracket 5 having a split head at its lower end in which a bearing bushing 6 is mounted, the bushin being clamped in the bracket by a bolt 7. shaft 8 is rotatably mounted in this bushing in a co-axial relationship to the driving shaft 9 of the motor 2. A fly wheel 10 is secured fast on the end of the shaft 8 adjacent to the motor and is directly connected to the motor shaft by a flexible coupling. This coupling comprises a collar 12 secured to the shaft 9 and having oppositely extended arms, as best shown in Fig. 2, and a flexible ring 14 secured to these arms by bolts 15-15. At points spaced angularly by 90 from the bolts 15-15, the ring 14 is secured to the fly wheel 10 by bolts 16-16. The member 14 preferably consists of a ring of leather or heavy woven fabric such as that used for brake linings and clutch facings.

By this arrangement the fly wheel 10 is constantly driven so long as the motor 2 is in operation.

The machine to be driven is connected by a belt 18 to a grooved pulley 19 that rotates freely on the stationary bushing 6. This pulley is provided with a cone clutch-face covered with asuitable lining or facing material 20 and cooperates with a similar face 21 on the fly wheel 10 to form a clutch by means of which a driving connection is established between the pulley and the fly wheel. Normally the pulley is out of driving engagement with the fly wheel and is held at rest by a fibre brake piece 22 mounted on the forward end of a lever 23 which is fulcrumed on the bracket 5 and is connected at its rearward end by means of a rod 24 to a foot treadle 25. A coiled spring 26 interposed between the base 3 and the lever 23 tends to hold the brake 22 in engagement with the groove in the pulley 19.

For the purpose of moving the pulley longitudinally of its axis of rotation to bring the clutch faces 20 and 21 into driving engagement, an arm 28 is piyoted at its upper end to the lever 23 and is provided with a rounded head 29 to engage an inclined face 30 formed on the bracket 5. ThlS head also engages the collar 31 of a ball thrust bearing 32. When the treadle 25 is depressed, the right hand end, Fig. 1, of the lever 23 is raised thus lifting the brake 22 off the pulley 19 and simultaneously raising the arm 28. The rounded part 29 of this arm engaging the inclined face 30 of the bracket forces the pulley 19 toward the right, this movement being transmitted through the thrust ball bearing 32, and the clutch face on the pulley thus is forced into driving engagement with the cooperating face on the fly Wheel 10. The momentum of the fly Wheel due to its rotation with the motor shaft is of very material assistance in overcoming the starting resistance of the machine and thus enables the motor to pick up the load smoothly and easily, avoiding the danger of stopping, and preventing the undesirable reduction of speed which, as above described, has proved to be one of the objections to the present driving mechanisms.

It is desirable to prevent the transmission of any endwise movement to the motor shaft during the operation of the clutch and for this purpose a thrust bearing 34. preferably consisting of a ball bearing, is located between the left-hand end of the bracket 5 and the corresponding end of the shaft 8. A nut 34' and a check nut 35 threaded on the end of the shaft bear against the outer collar of the ball bearing 2% and provide a convenient means for adjusting the shaft 8 longitudinally.

The pulley 19 preferably is of the self lubricating type and is provided with an internal oil reservoir 36 closed adjacent to the bore of the pulley by a bushing 37, the bushing being provided with holes to admit lubricating material to the friction surface between the bushings 37 and 6. The bracket 5 also is provided with a cavity 39 to receive waste or packing that may be saturated with oil, this oil being conducted by suitable ducts to the internal bearing surface of the stationary bushing 6 where it lubricates the shaft 8.

When the treadle 25 is released the spring 26 immediately acts to force the brake 22 into engagement with the groove in the pulley 19, and the lowering of the member 29 along the cam face 30 permits the pulley to move toward the left to disengage the clutch faces 20 and 21. The latter movement of the pulley is produced partly by the clutch faces and partly by the engagement of the brake member 22 with the left-hand wall of the belt receiving groove in the pulley. The brake brings the pulley to rest and the parts remain in this position until the treadle is again depressed.

It will now be understood that this invention provides a very simple and reliable construction which overcomes the starting difliculties above described thathave been found to exist with prior mechanisms of this general type. It will also be seen that the mechanism is so designed that it is not liable to get out of order and will run for a long period of time without care or attention.

What is claimed as new is:

1. A driving mechanism of the character described comprising a motor having a driving shaft, a driven shaft mounted co-axially with said driving shaft, a fly 'wheel fast on I said driven shaft, a flexible coupling connecting said fly wheel with said driving shaft, a pulley rotating about the axis of said driven shaft, said pulley and fly wheel having cooperating clutch faces and said pulley being movable longitudinally of said axis to engage or disengage said faces, means for forcing said pulley toward said fly wheel, and a thrust bearing for limiting the movement of said driven shaft toward said driving shaft.

2. A driving mechanism of the character described comprising a motor having a driving shaft, a driven shaft mounted co-axially with said driving shaft, a fly wheel fast on said driven shaft, a flexible coupling connecting said fly wheel with said driving shaft, a pulley rotating about the axis of said driven shaft, said pulley and fly wheel having cooperating clutch faces and said pulley being movable longitudinally of said axis to engage or disengage said faces, means for forcing said pulley toward said fly wheel, and a ball bearing through which said movement is transmitted to said pulley.

3. A driving mechanism of the character described'comprising a motor having a driving shaft, a driven shaft mounted co-axially with said driving shaft, a fly wheel fast on said driven shaft, a flexible coupling connecting said fly wheel with said driving shaft, a stationary bushing supporting said shaft. a pulley rotatably mounted on said bushing. said pulley and fly wheel having cooperating clutch faces and said pulley being movable longitudinally of said bushing to engage or disengag said faces, a thrust bearing for limiting the movement of said driven shaft toward said driving shaft, a bracket supporting said bushing, and a manually operated member cooperating with said bracket to force said pulley toward said fly wheel.

4. A driving mechanism of the character described comprising, in combination, a motor. a fly wheel mounted to rotate with the shaft of said motor. said fly wheel having a cone clutch face thereon, a bearing bracket, a driven shaft supported in said bracket coaxially with said motor shaft, a pullev rotatable about the axis of said driven shaft, a

cone clutch member rotatable about said axis and cooperating with the cone clutch face on said fly wheel, a lever for moving said clutch member into engagement with said clutch face, a brake arrangedto be operated by said lever to'stop the rotation of said clutch member and pulley, and a spring acting on said lever in a direction tending to operate the brake and to permit said clutch member to disengage said clutch face.

5. A driving mechanism of the character described comprising, in combination, a motor, a fly Wheel mounted to rotate with the shaft of said motor, said fly Wheel having a 15 cone clutch face thereon, a bearing bracket,

a second shaft supported in said bracket coaxially With said motor shaft, a pulley mounted on said second shaft, a cone clutch member rotating with said pulley, a lever pivoted on said bracket for moving said member axially of said second shaft into engagement with said clutch face, and a brake carried by said lever and arranged to engage a part rotatable with said clutch memher.

In testimony whereof We have signed our names to this specification.

EVERETT JAYCOX. MELVIN OLDS.

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