US1337992A

US1337992A - Dbiving and stopping mechanism

Info

Publication number: US1337992A
Authority: US
Publication date: 1920-04-27
Anticipated expiration: 1937-04-27

Description

F. ASHWORTH. DRIVING AND STOPPING MECHANISM.

N/m o Aw a nmd M 0 f 2 J N D 6 0 m m H. M #0 F. ASHWORTH.

DRIVING AND STOPPING MECHANISM.

' APPLICATION FILED NOV- 24, 19H?- 1,33'7,992. Patented Apn 27,1N2N,

4 SHEETS-SHEET 2.

F. ASHWORTH.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED NOV. 24, 1916.

1,337,992. Patented p 27, 1920.

4 SHEETSSHEET 3.

F. ASHWOR TH.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED NOV-24,1916.

1,8373%, Patented Apr- 27, 1920.

4 SHEETSSHEET 4.

Imvaziar %M UM TED STATES PATENT OFFICE.

FRED ASHWOIRTH, OF BEVERLY, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW J EB- SEY, A CORPORATION OF NEW JERSEY.

DRIVING AND STOPPING MECHANISM.

Specification of Letters Patent.

Patented Apr. 27, 1920.

Original application filed May 24, 1913, Se1'ia1 No. 769,566. Patent No. 1,233,539, dated July 17, 1917.

Divided and this application filed November 24, 1916.

To all whom it may concern:

vBe it known that I, FRED AsHWoRTH, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Driving and Stopping Mechanisms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to driving and stopping mechanisms, and more particularly to driving and stopping mechanisms for shoe sewing and other high speed nachines. I

The objects of the invention are to improve the construction and operation of driving and stopping mechanisms, and to produce a driving and stopping mechanism which will drive a shaft at a relatively high speed, and which will stop the shaft a predetermined point in its rotary movement in a uniform and reliable manner without undue shock or jar, and without excessive strain on the parts of the machine.

With the above objects in view, the invention contemplates the provision of the novel and improved constructions, arrangements and combinations of parts hereinafter described and pointed out in the claims, the advantages of which will be obvious to those skilled in the art.

The invention will be readily understood from the accompanying drawings illustrating the invention in its preferred form, and the following description of the constructions there-in shown. In the drawings, Figure 1 is a view in side elevation illustrating a shoe sewing machine with the drivingand stopping mechanism applied thereto; Fig. 2 is a plan view partly in sectlon lllustrat ng particularly certain parts of the driving and stopping mechanism apphed to the main shaft of the sewing machine; Fig. 3 isa sectional view taken substantially on the line 3-3 of Fig. 2; and Fig. 4 is a sectional view taken substantially on the line 4--4 of Fi 2.

n the drawings the invention is illustrated as embodied in a shoe sewing machine for sewing outsoles to the welts of welted shoes such as that illustrated and Serial No. 133,161.

described in Patent No. 1,233,539, dated July 17th, 1917, granted to the present ap' pli'cant on application Serial No. 769,566, filed May 24,1913, of which the present application is a division. It is to be understood, however, that the invention, and the particular embodiment thereof herein shown, are not limited to a shoe or other sewing machine, but that they are applicable to other machines and may be used in other relations.

The shoe sewing machine illustrated in the drawings is provided with stitch forming work holding and work feeding devices,

the construction and mode of operation of which need not be described in this application. These devices are all driven from a main shaft 2.

The machine is driven during the sewing operation from a main driving shaft 4 ournaled in bearings in the base of the machine by means of a belt 6 passing about a pulley S which is arranged to be driven through driving connections from the main driving shaft and about a pulley 10 secured to the end of the main shaft 2 of the machine. The pulley 8 'is connected through intermeshing beveled gears 12 with a sleeve 14 mounted on the main driving shaft 4, to which sleeve is secured one member 16 of the main driving clutch. The other member 18 of the main driving clutch is mounted to rotate with the main driving shaft, and is movable longitudinally of said shaft into and out of engagement with the clutch member 16. The engagement of the clutch member 18 with the cooperating clutch member 16 is controlled by a clutch operating wedge 20 which is connected with and actuated from the treadle 22. l/Vhen the treadle is depressed the clutch members are engaged and the machine is driven at a speed depending upon the pressure applied to the treadle by the operator. Vhen the treadle is released the clutch members are disengaged and the main shaft 2 of the machine is thereby disconnected from the driving shaft 4. The shaft 4 is driven from the power shaft by means of a belt passing about a pulley 24 fixed upon the shaft 4.

26 indicates a loose pulley mounted upon the shaft 4.

The upward movement of the treadle when it is released not only disconnects the main shaft of the machine from the main driving shaft located in the base thereof, but also throws into operation mechanism by which the main shaft is slowed down to a predetermined slow speed then driven at slow speed in a forward direction and finally stopped at a predetermined point in a cycle of operations. The mechanism for slowing down the shaft and for driving it at slow speed comprises a friction clutch consisting of a driving friction clutch member 28 loosely mounted on the main shaft 2, which is constantly driven at a definite slow speed in a forward direction and a cooperating driven friction clutch member 30 mounted on the shaft 2 to rotate with the shaft. A spiral gear 32 is secured to the clutch member 28 and said clutch member is driven by means of a spiral pinion 84 meshing with said gear. The spiral pinion 84 is mounted upon a shaft 36 which carries a pulley 38 and the shaft 36 is constantly driven from the pulley 24 by means of a belt 40 passing about a pulley 42 formed on the hub of the pulley 24 and about the pulley 38. The clutch member 30 is secured to a sleeve 44 which is free to slide longitudinally of the shaft 2 but is connected to rotate with the shaft by means of a block 46 secured in the pulley 10, the inner end of which is engaged between lugs 48 projecting outwardly from the sleeve 44. The sleeve 44 is normally maintained in a position such that the clutch member 30 is disengaged from the clutch member 28 by means of a coiled spring 50 seated in a recess in the block 46 and acting against the head of a pin or bolt 52 slidably mounted in the block 46 and having a plate 54 secured to its inner end which engages the inner faces of the lugs 48.

lVhen the members of the slow speed friction clutch are engaged they first act as a friction brake to slow down the speed of the main shaft of the machine until it is rotating at the speed of the slow speed driv-- ing clutch member, after which the main shaft is driven at slow speed in a forward direction by the slow speed driving clutch member until the machine is brought to stopping position when the members of the slow speed clutch are disengaged and the rotation of the main shaft is stopped. The

clutch members

28 and 30 are engaged at a predetermined point in the rotation of the main shaft of the machine and the said clutch members are disengaged and the rotation of the shaft arrested at the end of a predetermined interval after the engagement of the clutch members, so that the shaft is always slowed down and its rotation finally arrested in a uniform manner. The mechanism for engaging and disengaging the

clutch members

28 and 30 at predetermined points in the rotation of the shaft comprises a timing cam consisting of a cam groove 56 formed in the sleeve 44 in which engages a cam roll 58 carried b one arm of the bell crank lever 60 pivote on a stud 62, the other arm of which is provided with a recess 64 arranged to receive the head of a locking pin 66. mounted to slide vertically in the rear end of a slide 68, and is moved upwardly in said slide into engagement with the recess 64 in the arm of the bell crank lever 60 by a coiled spring 70. The slide 68 is provided with a reduced extension 72 arranged to slide through an adjustable sleeve 74 threaded into the frame. The rearward movement of the slide 68 is limited by a stop nut 7 6 which engages the end of the sleeve 74 and the slide is held in normal position in the frame by means of a'coiled spring 78 surrounding the reduced portion of the slide and interposed between a shoulder on the slide and the inner end of the sleeve 74. By adjusting the sleeve 74 the slide 68 may be adjusted so as to bring the locking pin into position to register with the recess 64 in the arm of the bell crank lever 60 at the proper time in a cycle of operations and by adjusting the nut 76 the tension of the spring 7 8 may be varied.

The locking pin is controlled from the treadle so that when the treadle is depressed and the main driving clutch in the base of the machine is engaged to drive the machine, the locking pin is held down out of engagement with the recess 64 and the bell crank lever 60 is then oscillated idly by the cam 56. \Vhen the treadle is released and rises to disconnect the main shaft of the machine from the main driving shaft, the locking pin is engaged with the recess 64 and the bell crank lever is thereby locked to the slide 68. When the bell crank lever 60 and the slide 68 are thus locked togetherthe cam 56 acting upon the roll 58 will force the sleeve 44 longitudinally of the shaft 2 in the directionto bring the clutch member 30 into engagement with the driving clutch member 28. The force with which the slow speed clutch members are engaged Will depend upon the tension of the spring 78 and this may be adjusted so that the shaft will be slowed down to the speed of the slow speed driving clutch member and will be driven by said member in a forward direction before the slow speed clutch members are disengaged and the rotation of the main shaft is arrested. The timing cam 56 and the mechanism coiiperating therewith acts to bring the

clutch members

28 and 30 into engagement at a definite point in the rotation of the shaft. When the shaft has been slowed down to the slow speed of the slow speed driving clutch member and while it is driven at slow speed by said member the continued rotation of the cam 56 will cause The locking pin 66 is.

the disengagement of the clutch members at the end of a definite interval after they were engaged.

The mechanism for controlling the engagement of the locking pin with the recess 64 in the arm of the bell crank lever comprises a link 80 pivotally connected with a block secured to the lower end of the locking pin and connecting said pin with the arm 82 of a three-armed lever 84 pivoted upon a stud 86. This lever is provided with a second arm 88 upon the end of which is mounted a roll 90. The locking pin is held down out of engagement with the recess 64 in the arm of the bell crank lever, while the treadle is depressed and the main driving clutch in the base of the machine is engaged by the engagement with the roll 90 of a curved face 92 formed upon the outer end of an arm 94 pivoted on a stud 96 and connected with the forward end of the. treadle by means of a rod '98. The curved face 92 is formed substantially concentric with the path of movement of the outer end of the arm .94 so that the movements of the treadle in producing variation in the speed of the machine will not affect the position of the locking pin. When the treadle is released and rises, the arm 94 is swung upwardly to disengage the outer end thereof from the roll 90 and the locking pin is then forced upwardly in the slide 68 by the spring 7 0 into engagement with the under side of the arm of the bell crank lever and when the recess 64 registers with the head of the pin, the pin snaps upward into the recess. Fig. '3 shows clearly the position of the parts when the treadle is released and the machine is at rest. When the treadle is depressed to start the machine,'the outer end of the arm 94 engages the roll 90 and swings the three-armed. lever 84 to disengage the locking pin from the recess in the arm of the bell crank lever. The parts are constructed and arranged so that the locking pin is disengaged from the recess 64 before the main driving clutch is engaged, and the continued downward movement of the treadle to engage the main driving clutch brings the curved outer face of the arm '94 into engagement with the roll 90.

To enable the main shaft to be rotated manually whenever it is desirable, the outer end of the arm 94 is formed with a locking recess 100 to receive the roll 90 at a time when the locking pin is disengaged from the recess in the arm of the bell crank lever and when the members of the main driving clutch are disengaged. lVhen it is desired to rotate the main shaft of the machine manually the operator, if the treadle is dethe roll 90in said recess. The treadle then may be released by the operator and the engagement of the roll 90 in the recess 100 will hold the arm 94 and the treadle from rising under the influence of the treadle lifting spring.

The invention in its illustrated embodiment also comprises a lever 102 which is engaged by a cam on the main shaft 2 of the machine to slow down the rotary movement of the shaft just before it is stopped, and which is engaged by a projection or lug on the shaft to finally arrest the rotation of the shaft. Connections are provided between the lever 102 and the presser foot which are operated by the movement imparted to the lever by the cam to lift the presser foot from the .work. These connections have nothing to do with the present invention, and therefore are not described in this application. The lever 102 is mounted upon a rocking sleeve 104 carried upon a stud 1'06 arranged substantially parallel with the main shaft 2 of the machine so that the lever 102 is arranged to swing upon an axis substantially parallel with the axis of said shaft. A cam 108 is mounted on the main shaft 2 of the machine to engage the outer end of the lever 102 and swing said lever and the sleeve 104 on which it is carried to the left, Fig. 3, about the stud 106. The sleeve 104 carries an arm 110 which is connected by a link 112 with the arm 114 of a lever 116 pivoted upon a stud 118.

The lever 102 is actuated by the cam as the shaft is executing its final forward movement just before it is brought to rest. lVhile the treadle is depressed to maintain the main shaft of the machine in normal driving connection with the main driving shaft in the base of the machine, the lever 102 is held out of the path of the cam and is moved into the path of the cam as the treadle is released and rises to throw into action the mechanism for slowing down the shaft and driving it forward at slow speed to stopping position. To enable the lever 102 to be moved into and out of the path of the cam said lever is pivotally connected with the sleeve 104 by pivot pins 120 secured in arms on the lever 102 and arranged at right angles to the axis of the sleeve, the inner ends of which engage in cylindrical sockets in the sleeve 104. The lever 102 is provided with a horizontally extending arm 122, the end of which projects forwardly at an angle to the main portion thereof across the end of the stud 106 and carries an abutment screw 124 arranged substantially in line with the axis of the stud. The lever 102 is maintained out of the path of the cam 108 when the machine is running normally by the engagement of an arm 126 of the three-armed lever 84 with the end of the screw 124. hen the treadle is depressed the three-armed lever 84 is actuated by the engagement of the arm 94 with the roll 90 to lift the arm 126 and swing the lever 102 on the pivot pins 120 so as to place the end of the lever at one side of the path of the cam 108, and the lever 102 is held in this position while the roll 90 is engaged with the curved face of the outer end of the arm 94. \Vhen the treadle is released and rises to release the arm 94 from the roll 90 and the locking pin rises under the influence of the spring 70, the arm 1.26 of the three-armed lever is depressed and the lever 102 is swung into the path of the cam 108 by a spring 128 connected at one end with. thearm 122 of the lever. The arm 110 is provided with a shoulder 1.30 which engages the rear side of the lever 102, thereby taking the strain from the pivot pins 120 when the lever 102 is actuated by the cam.

The movement of the shaft is finally arrested by the engagement of a projection or lug 132, carried by the main shaft 2, with the end of the lever 102. This projection is arranged. in the plane of rotation of the cam 108 so that the movement of the lever 102 to carry it into and out of the path of the cam will also carry it into and out of the path of the lug. The cam 108 andlug 132 act in cooperation with the lever 102 respectively as a friction brake and a positive stop to slow down and stop the main shaft of the machine in a predetermined position.

To further check the rotation of the shaft before the lug 132 engages the end of the lever 102, the lever 116 is provided with a second arm 134 which carries an abutment screw 136 for engagement with the arm 1 -38 of a bell crank lever pivoted on the stud 62. The other arm 140 of this bell crank carries a brake shoe 142 arranged to engage the inner face of the pulley 10. When the lever 102 is actuated by the cam to swing the arm 114 of the lever 116 to the rear, the abutment screw at the end of the arm 134 engages the arm 138 of the bell crank 138 140 and the bell crank is actuated to engage the brake shoe 142 with the pulley 10.

In order that there may be very little re-' sistance to the lateral swinging movement of the lever 102 to carry said lever out of the path of cam 108 and lug 132 when the treadle is depressed so that the machine may be started with a comparatively light pressure on the treadle, a gap or recess 144 is formed between the cam 108 and the lug 132 so that the cam is disengaged from the lever before the lever is engaged by the lug. When the lever 102 has been actuated by the cam, the lever and the parts actuated thereby'are held in position so that the end of the lever does not drop into the recess 144 by a latch 146. The latch is fixed upon a fulcrum stud 148 and has a catch projection 150 which engages in front of the extension on the head of the pivot pm 152 connecting the link 112 with the arm 114 when the parts have been actuated by the cam 108. A horizontal arm 154 is fixed to the stud 148 and the latch is moved forward to engage the projection 150 in front of. the extension on the pin 152 by the action of the force of gravity on said arm. \Vhen the lever 102 is swung about the pivot pins 120 to locate the end of the lever out of the path of the cam 108 and lug 132, the latch is disengaged from the extension on the pin 152 to allow the lever 102 and the parts actuated from the lever to return to their normal position by the engagement of the upper face of a laterally extending lug 156 on the arm 122 of the lever 102 with an abutment screw 158 mounted in the offset end of the arm 154.

Having explained the nature and object ofthe invention, and having specifically de scribed the mechanism embodying the invention in its preferred form, what is claimed is:

1. A driving and stopping mechanism,

having, in combination,- a shaft, driving mechanism for the shaft, a'movable member adapted to be controlled by the operator for connecting the driving mechanism with and for disconnecting the driving mechanism from the shaft, devices for stopping the rotation of the shaft, a second movable member, connections for throwing the stopping devices into andout of operation from the movements of said member, a roll carried by the second member, an arm for engaging the roll to actuate the second member to throw the stopping devices out of operation having a contact face for engaging the roll to hold the second member in position during the movement of the arm after the stopping devices have been thrown out of operation, and a connection between sald arm and the first member for controlling the movement of the arm to maintain the stopping devices out of opera tion until after the driving mechanism has been disconnected from the shaft.

2. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, a movable member adapted to be controlled by the operator for connecting the driving mechanism with and for disconnecting the driving mechanism' from the shaft, devices for stopping the rotation of the shaft, a second movable member, connections for throwing the stopping devices into and out of operation from the movements of the second member, a roll carried by the second member, an arm for engaging the roll to actuate the second member to throw the stopping devices out of operation having a contact face for engaging the roll to hold the second member in position during the movements of the arm after the stopping devices have been thrown out of operation, and a connection between said arm and the first member for controlling the movement of the arm to maintain the stopping devices out of operation until after the driving mechanism has been disconnected from the shaft, said arm having a locking recess to receive the roll and lock the arm and the first member from movement when the second memher is held by the arm in position to maintain the stopping devices out of operation and the driving mechanism is disconnected from the shaft.

3. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, a lever adapted to be controlled by the operator for connecting the driving mechanism with and for disconnecting the driving mechanism from the shaft, devices for stopping the rotation of the shaft, a second lever, connections for throwing the stopping devices into and out of operation from the movements of the second lever, a roll carried by the second lever, av pivoted arm for engaging the roll .to actuate the second lever to throw the stopping devices out of operation having a contact face curved in an are substantially concentric with the path of the outer end of the arm for engagement with the roll to hold the second lever in position during the movements of the arm after the stopping devices have been thrown out of operation, and a link connecting the arm and the first lever for controlling the movement of the arm to maintain the stopping devices out of operation until after the driving mechanism has been disconnected from the shaft.

4. A driving and stopping mechanism having, in combination, a shaft, high speed driving mechanism for the shaft, a treadle for controlling the connection of the shaft with the high speed driving mechanism, a slow speed clutch comprising a driving clutch member and a driven clutch member connected to rotate with the shaft, a cam carried by one of the clutch members, a clutch operating lever actuated by the cam, a locking pin for rendering the clutch operating lever active to bring the members of the slow speed clutch into engagement when the shaft is disconnected from the high speed driving mechanism, means for controlling the engagement of the locking pin with the lever, comprising a second lever, a connection between the second lever and the locking pin, a roll carried by the sec- 5. A driving and stopping mechanism having, in combination, a shaft, driving mechanism therefor, means for slowing down and finally stopping the shaft at a predetermined point in its rotary movement comprising a cam and a stop carried by the shaft, a member arranged to be actuated by the cam and to be engaged by the stop to arrest the rotation of the shaft mounted for movement into and out of the path of rotation of the cam and stop and normally held out of the path thereof, a brake, connections between said member and the brake for engaging the brake when said member is actuated by the cam, and means under control of the operator for disconnecting the shaft from the driving mechanism and moving said member into the path of the cam and stop.

6. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, a brake wheel mounted on the shaft, a brake lever, a brake shoe carried thereby for engagement with the brake wheel, a cam carried by the shaft, connections for actuating the lever from the cam to engage the brake shoe with the brake wheel, a: stop carried by the shaft, a stop member arranged to cooperate therewith to stop the shaft at a predetermined point after it has been slowed down by the engagement of the brake shoe with the brake wheel, and means for rendering the cam effective and ineffective to actuate the lever and for moving relatively the stop member and stop into and out of operative relations.

7. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, a brake, a cam carried by the shaft, a lever arranged to be actuated by the cam, connections actuated by the lever for engaging the brake, a stop carried by the shaft for engaging the lever to stop the shaft at a predetermined point, and means for moving relatively the lever and the cam and stop into and out of operative relations.

8. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, a brake, a cam carried by the shaft, a stop carried by the shaft and a single member arranged to be actuated by .the cam to engage the brake to' check the rotation of the shaft and to be engaged by the stop to stop the rotation of the shaft at a predetermined point in its rotary movement.

9. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, a brake, a cam carried by the shaft, a movable member arranged to be actuated by the cam, connections actuated by said member for engaging the brake, devices for stopping the rotation of the shaft at a predetermined point after the cam has moved out of engagement with said member, means for holding said member in the position into which it is moved by the cam, and mechanism under control of the operator for moving relatively said member and the cam out of operative relations upon starting the machine.

10. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, mechanism for stopping the rotation of the shaft, a normally inactive cam carried by the shaft, devices arranged to be actuated by the cam upon stopping the shaft, and a latch inactive during the actuation of said devices by the cam and acting when said devices have been released by the cam to hold said devices in the positions into which they are moved by the cam.

11. A. driving and stopping mechanism, having, in combination, a shaft, driving mechanism. for the shaft, mechanism for stopping the rotation of the shaft, a normally inactive cam carried by the shaft, de-

vices arran ed to be actuated by the cam upon stopping the shaft, a latch inactive during the actuation of said devices by the cam and acting when said devices have been released by the cam to hold said devices in the positions in which they are moved by the cam, and means for rendering the latch active upon stopping the shaft and for throwing out the latch upon starting the shaft.

12. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism for the shaft, mechanism for slowing down and finally stopping the rotation of the shaft comprising a brake, a cam carried by the shaft, connections arranged to be actuated by the cam for engaging the brake, and a latch for holding said connections in the positions into which they are moved by the cam.

13. A driving and stopping mechanism, having, in combination, a shaft, driving mechanism therefor, means for slowing down and finally stopping the shaft at a predetermined point in its rotary movement comprising a cam and a stop carried by the shaft, a member arranged to be actuated by the cam and to be engaged by the stop to arrest the rotation of the shaft, a brake, connections between said member and the brake for engaging the brake when said member is actuated by the cam, means under control of the operator for connecting the driving mechanism with and for disconnecting the same from the shaft, and for moving said member out of and into the path of the cam and stop, and locking devices arranged to lock the parts in position with the driving mechanism disconnected from the shaft and said member located out of the path of the cam and stop to permit the rotation of the shaft by hand.

FRED ASHWORTH.