US612799A

US612799A - Op same place

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Publication number: US612799A
Authority: US
Publication date: 1898-10-18
Anticipated expiration: 1915-10-18

Description

N0. 6l2,799. Patented Oct. 18, I898.

S. M. CUTTER.

CLUTCH.

(Application filed July 20, 1896.) (No Model.) 2 Sheets-Sheet l.

W P #1 \x/iT essEa-a IL L No. 6l2,799. Patented Oct. l8, I898.

8. M. CUTTER.

. C L U T C H.

(Application filed July 20, 1896.)

(No Model.) 2 Sheets-Sheet 2.

E 5 E E ITjE EIJiL DIL w w wp m NITTED' STATES PATE T OFFICE. I

ASSIGNMENTS, TO THE WVIRE GRIP FASTENING COMPANY OF MAINE,

OF SAME PLACE.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 612,799, dated October 18, 1898.

Application filed July 20, 1896. Serial No. 599,985. (No model.)

To aZZ whom it may concern.-

Be it known that I, SOLOMON CUTTER,-

of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in' Starting and Stopping Mechanisms for Machinery, of which the following, taken in connection with the accompanying drawings,'is a specification.

This invention relates to improvements in starting and stopping mechanisms to be used upon machines of different kinds and so arranged as to start or stop said machines when the different devices constituting them are in predetermined relative position to each other.

It has for its objects to start or stop the machines with as little shock as possible, to insure its stopping with the various devices in the same relative positions at all times, andto start and stop the machine with as little motion to the moving parts and as little expenditure of power as possible.

With these objects in view the invention consists in the arrangements and combinations of parts, substantially as illustrated on the accompanying drawings, which form an essential part of this specification, and whereon Figure 1 represents a sectional side elevation of a portion of the frame and drivingshaft of a machine with my improved starting and stopping mechanism connected thereto, whereby a rotary movement is imparted to said driving-shaft or said shaft is stopped from rotation. Fig. 2 represents a vertical section on the line A 13, shown in Fig. 1: Fig. 3 represents a vertical section on the line C D, also shown in Fig. 1. Fig. 4 representsa horizontal section on the line E F, shown in Fig. 1. Fig. 5 represents a vertical section on the line G H in Fig. 1. Fig. 6 represents a vertical section on the line I J in Fig. 1

Like characters of reference refer to like parts wherever they occur on the different parts of the drawings.

The invention is applicable to different kinds of machines in which a rotary motion is to be imparted to a driving-shaft from a continually-rotatin g pulley or disk or in which said shaft is to be stopped from rotating at intervals; but it is designed to be used more especially on nail-drivin g, pegging, or sewing machines.

Within suitable hearings in the frame 1 of the machine is rotatably mounted the driving-shaft 2, and upon said shaft is loosely mounted a pulley or pulleys. Two

pulleys

3 and 4 have been shown.- Attached to or made in one piece with the pulley 4 is a balance-wheel 5. Upon the driving-shaft is also loosely mounted the sleeve 6. One or more bolts 7 7 pass through perforations in the sleeve 6 and through slots 8 8 in the hub or web of the pulley 4, which slots are so arranged as to allow the sleeve 6 to havea slight rotation on the driving-shaft independent of the pulley 4. Nuts 9 9 are placed upon the projecting ends of the bolts 7 7, which act to ieep said sleeve in contact with the hub of the pulley 4. The heads of the bolts? 7 form projections 10 10 on the outer end of the sleeve 6, substantially as shown and for a purpose to be described hereinafter. One or more springs 11, of the desired strength, are attached at one end to the sleeve 6 or projection on said sleeve and at the other end to the pulley 4 or balance-wheel 5, the action of the spring 11 tending to rotate the, sleeve 6 upon the driving-shaft in the direction of the rotation of the pulley 4, and therefore to hold the bolts 7 7 in the forward ends of the slots 8 8 in relation to the direction of the rotation of said driving-pulley 4.

From the above description of the device it will be seen that as the pulley 4 is kept in a continuous rotating motion in the direction of the arrow shown in Fig. 2 by means of a suitable belt or other equivalent device (not shown on the drawings) the sleeve 6 will also be kept in a continuous motion in the same direction, and as the spring 11 tends to hold the bolts 7 7 in the forward ends of the slots 8 in relation to the direction of the rotation of said pulley anything coming-in contact with the sleeve 6 and tending to retard the rotation of the sleeve will cause the bolts 7 to move within the slots 8 against the influence of the spring 11 and in a direction opposite to the direction of the pulley 4. Thus the spring 11 will act as a cushion to the blow received, and consequently lessen the shock.

The sleeve 12 is keyed or otherwise firmly mounted upon the driving-shaft 2, and the dog 13 is fulcrumed at 14 within a longitudinal groove on the outside of said sleeve in such a manner that it will be capable of a rocking movement on said fulcrum, so that its ends will move toward and from the center of the driving-shaft. Springs 15 15 of any suitable construction act upon the dog, so that when in its normal position the inner end of the dog will be forced outward from the center of the driving-shaft. These springs are shown as spiral springs placed within recesses in the sleeve, which springs act upon a rod 16, which rod passes through the dog and projects on either side thereof, as shown in Fig. 6. One of the projections 10 on the sleeve 6 engages the inner end of the dog when the dog is in its normal position, and thereby turns the driving-shaft by the rotary motion of said pulley in the direction of the arrows, as shown on the balance-wheel attached to the pulley 4.

A rod 17 is moved vertically by means of a suitable treadle, hand-lever, or other suitable device, which device is not shown on the drawings, however. The upper end of said rod is pivotally attached to the bell-crank lever 18, which lever is fulcrumed at 19 to the frame 1 of the machine. The free arm of the bell-crank lever 18 extends upward at one side of the bearing for the driving-shaft and is there provided with the hooked wedgeshaped portion 20, as shown in Fig. 2. The bearing for the driving-shaft is cut away, as shown in Figs. 2 and 4, to receive the upper wedge-shaped portion of the bell-crank lever when said portion is forced backward to the position shown in Fig. 1 when starting the machine. A coil-spring 21 surrounds the rod 17 between an ear on the frame 1, through which the rod passes, and a collar adj ustably mounted on the rod, the influence of said spring tending to move the wedge-shaped por-.

tion of said lever forward, so that the tail of the dog 13 in rotating with thedriving-shaft will engage said wedge-shaped portion and by so doing will turn said dog upon its fulcrum and swing the inner end of the dog toward the center of the driving-shaft out of engagement with the projection 10 on the sleeve 6, with which it has been in engagement. This action of the bell-crank lever will prevent any further rotary motion being imparted to the driving-shaft from the pulley 4. A spring-pressed stop 22 is attached to the top of the bell-crank lever 18 and is engaged by the tail of the dog 13 after said dog has been acted upon by the wedge on the bellcrank lever and disengaged from the projections on the sleeve 6. This spring-pressed stop 22 forms a yielding cushion for the dog, and'thus the stopping of the driving-shaft, and consequently the stopping of the machine, is accomplished with as little shock as possible to the machine. If so desired, the bellcrank lever may be provided with a springtion of the wedge 20, which portion is of sufficient size and in such a location on said sleeve as to hold the bell-crank lever 18 in position until after the machine has completed its operation, said out away portion being brought into line with the wedge portion of the bell-crank lever just prior to the completion ofthe operation of the machine, or so that the wedge will have disconnected the dog 13 from the projection 10 when said operation is completed.

In order to still further lessen the shock to the machine when stopped, I may provide the driving-shaft with a suitable brake, and such has been shown as being constructed as follows: A lever 25 is fulcrumed at 26 to the frame, the free end of this lever being connected to a second lever 27 by means of a connecting-link 28. The lever 27 is fulcrumed at 29 to the frame and at its opposite end attached to the bell-crank lever 18 by means of a bolt or stud which passes through and is adjustable in slots in the

levers

27 and 18. Thus it will be seen that when the bell-crank lever is turned on its fulcrum to cause the starting and stopping of the machine it will through its connection with the lever 25 cause the latter lever to turn in either direction on its fulcrum 26. A friction band or brake 3O surrounds a pulley or cylinder 31, being connected at its ends to the lever 25 in such a manner that when the said lever is turned on its fulcrum in stopping the machine it will cause said band to draw tightly around said pulley, and thereby produce a friction between the band and pulley which will tend to stop the rotation of the driving-shaft. Thus it will be seen that the friction-band and its connection with the starting and stopping mechanism form a brake which will help stop the machine with as little shock as possible, By the adjustment of the stud within the slotted perforations in the lever 27 and in the bell-crank lever 18 I am enabled to adjust the amount of the friction of the band 30 on the pulley 31.

When it is desired to start the machine, the rod 17 is moved upward against the influence of the spring 21 to the position shown in Fig. 1, thus causing the bell-crank lever 18 to withdraw its attached wedge-shaped portion 20 from contact with the dog 13, allowing the springs 15 15 to force the inner end of the dog outward from the center of the shaft and into the path of the rotation of the projections 10 10 on the sleeve 6, which projections are kept in constant rotation by means of the yielding connection between the sleeve 6 and the driving-pulley 4. When the projection 10 engages the dog 13, the shock and strain upon saidparts is cushioned and lessened by means of the spring 11 and the sleeve will for an instant remain stationary, while the pulley 4 continues its rotation, expanding or spreadingthe spring 11 and causing the bolts 7 to move within the slots 8 in the pulley until the strength of the spring has increased sufficiently to overcome the resistance of the driving-shaft and caused said shaft to rotate, thus starting the machine; At the same time that the lever 18 is turned upon its fulcrum to the position shown in Fig. 1 and so as to start the machine the lever 27 will be operated and through its connection with the lever 25 will operate said lever 25 and remove the brake 30 fromthe pulley 31.

When it is desired to stop the machine, the spring 21 is allowed to exert its downward pressure on the rod 17, and as soon as the recess 24: in the sleeve 12 comes into position to receive the wedge portion 20 on the lever 18 said lever will turn on its fulcrum, causing its wedge-shaped portion to enter said recess and to be in the path of the rotation of the dog 13 with the driving-shaft 2. The outer end of the dog will engage the wedge 20, and by so doing will cause said dog to turn upon its fulcrum and remove its inner end from contact with the projection 10 in the sleeve 6. This will release the sleeve 6 and allow it to rotate with the driving-pulley without imparting any further rotary motion to the driving-shaft. When the dog has been disengaged from the projection on the sleeve, the end of the dog will come in contact with the yielding stop 22 and prevent any further rotation of the driving-shaft, the yielding of said stop reducing any shock or strain which might be caused if said shaft were stopped by a rigid stop.

During the time that the lever 18 is being moved in order to stop the machine the lever 27 is operating the brake 30, so as to cause it to create sufficient friction with the pulley 31 as to reduce the momentum of the drivingshaft and therefore tostill further lessen the shock and strain on the machine.

I wish it to be understood that I do not confine myself to the exact details of construction or the combination of parts as herein described and set forth, as such may be changed within the scope of mechanical skill and other equivalent devices used without departing from the spirit of my invention.

Having thus fully described the nature,construction, and operation of my invention, I wish to secure by Letters Patent and claim- 1. In a starting and stopping mechanism for machinery, a driving-shaft, a rotating pulley loosely mounted on said shaft, a sleeve having project-ions thereon, also loosely mounted on said shaft, a yielding connection between said sleeve and pulley, a second sleeve firmly mounted on said shaft, a dog pivoted to said second sleeve, arranged len gthwise of said shaft and movable radiallyin respect to the shaft and means within thecontrol of the operator to cause said dog to engage or disengage the projections on said firstnamed sleeve to start and stop the machine, said yielding connection preventing undue jar or shock when the machine is started all combined to operate, for the purpose set forth.

2. In a starting and stopping mechanism for machinery, a rotating part provided with a projection, a shaft to be driven thereby, a dog, pivotally connected to said shaft, disposed lengthwise thereof and movable radially with respect thereto, means for engaging and disengaging said dog and projection, to normally hold said dog out of engagement with said projection and to release said dog' when desired, for the purpose set forth.

3. In a starting and stopping mechanism for machinery, a rotating part provided with a projection, a shaft to be driven thereby, a dog pivotally connected to said shaft, disposed lengthwise thereof, and movable radially with respect thereto, a lever having a wedge portion to normally engage said dog, and disengage it from said projection, but movable out of engagement with said dog, and means to normally hold said dog in engagement with the projection, for the purpose set forth.

4. In a starting and stopping mechanism for machinery, a driving-shaft, a rotating pulley loosely mounted on said shaft a sleeve firmly mounted upon said shaft, aspring-actuated dog pivoted to said sleeve, arranged lengthwise of the shaft and movable radially in relation thereto a projection connected with said pulley and engaged bysaid dog, to cause the rotation of the driving-shaft, a pivoted lever, a wedge-shaped projection thereon moved into the path of the rotation of said dog to disengage said projection and dog to stop the machine and move out of said path to allow said projection to engage said dog to start the machine, and mechanism to operate said lever, for the purpose set forth.

5. In a starting and stopping mechanism for machinery, a driving-shaft, a rotating pulley loosely mounted upon said shaft, a sleeve firmly mounted on said shaft, a spring-actuated dog pivoted to said sleeve, a projection connected with said pulley and engaged by said dog, to cause the rotation of the driving-shaft, a pivoted lever, a wedge-shaped projection thereon moved into the path of the rotation of said dog to disengage said projection and dog, to stop the machine and move out of said path to allow said projection to engage said dog to start the machine, and a yielding stop on said lever to cushion the shock to the machine when stopped, for the purpose set forth.

6. In a starting and stopping mechanism for machinery, a driving-shaft, a rotating pulley loosely mounted on said shaft, a sleeve firmly mounted on saidshaft, a spring-actuated dog pivoted to said sleeve, a projection connected with said pulley and engaged by said dog to cause the rotation of the drivingshaft, a pivoted lever, a wedge-shaped projection thereon moved into the path of the ley, loosely mounted on said shaft,-a sleeve,

firmly mounted on said shaft, a spring-actuated dog, pivoted to said sleeve arranged lengthwise of said shaft and movable radially in relation thereto, a projection connected with said pulley and engaging said dog to cause the rotation of said shaft, and means within control of the operator to engage said dog to disengage it from said projection to discontinue the rotation of said shaft, for the purpose set forth.

8. In a starting and stopping mechanism for machinery, a driving-shaft, a rotating pulley loosely mounted upon said shaft, a clutch device between said pulley and shaft to cause the rotation or the stopping of said shaft, a pivoted lever and connected mechanism to operate said clutch device, a pulley firmly mounted upon said shaft, a friction -belt around said firm pulley, to cause friction thereon to stop the rotation of the driving-shaft, a

lever pivoted to the frame of the machine, having the ends of the friction-belt attached thereto, eccentric to the fulcrum of said lever, to operate said belt when said lever is turned on its fulcrum, a lever fulcrumed to the frame of the machine, connected to the clutch-operating mechanism and turned 011 its fulcrum by the operation of said mechanism, and a link connecting with said friction-belt-operating lever, and a lever connected to the clutch-operating mechanism, for the purpose set forth.

9. In a starting and stopping mechanism for machinery, a driving-shaft, a rotating pulley loosely mounted on said shaft, a sleeve firmly mounted on said shaft, having a recess therein substantially as described, a springactuated dog pivoted to said sleeve, a projection connected with said pulley and engaged by said dog to cause the rotation of the driving-shaft, a pivoted lever having a wedgeshaped portion thereon to be brought into engagement with said dog to stop the rotation of said driving-shaft, the recess in said sleeve so arranged as to receive said wedge and allow the engagement of the wedge and dog only when the rotation of the driving-shaft has caused the completion of the operation of the machine, for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SOLOMON M. CUTTER.

l/Vitnesses:

H. WARREN SPENCER, HENRY OHADBOURN.