US1355159A

US1355159A - Driving and stopping mechanism

Info

Publication number: US1355159A
Application number: US256583A
Authority: US
Inventors: William C Meyer
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1916-05-06
Filing date: 1918-10-02
Publication date: 1920-10-12
Anticipated expiration: 1937-10-12
Also published as: US1391398A; US1429520A

Description

W. C. MEYER.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2. 1918.

1,355; 59, Patnted Oct. 12,1920.

5 SHEETS-SHEET I.

w. c. MEYER. DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2, I918.

Patented Oct. 12, 1920.

5 SHEETS-SHEET 2- W. C. MEYER.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2. I918.

' 1,355,159. Patented Oct. 12,1920.

5 SHEETS-SHEET 3.

W. C. MEYER.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2 19I8.

Patented Oct. 12,1920.

5 SHEETS-SHEET 4.

W. C. MEYER.

DRIVING AND STOPPING MECHANISM. APPLICATION FILED ear. 2. 191a.

1,355,1 59, Patented Oct. 12, 1920.

5 SHEETS-SHEET '5- ]afj 314.25

UNITED STATES PATENT OFFICE.

WILLIAM C. MEYER, 015' BEVERLY, MASSACHUSETTS, AssIGNORTC UNITED stron- MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION on NEW JERSEY.

T 0 all whom it may concern:

Be it known that I, WILLIAM G. MEYER, a citizen of the United States, residin 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.

The present invention relates to driving and stopping mechanisms and more particularly to mechanisms of this character which are adapted for use on shoe sewing or other high speed machines.

The primary object of the invention is to provide for high speed machines, a driving and stopping mechanism having an improved construction and mode of operation by which a machine which 'is normally driven at a relatively high or at varying speeds, may be automatically Stopped with certaintyv and accuracy at a predetermined point in a cycle of operations without producing undue shock or vibration, or Subjecting the parts of the machine to excessive Strain. With this object in view the invention consists in certain novel and improved constructions, arrangements and combinations of parts hereinafter described and particularly pointed out in the claims, the advantages of which will be understood and appreciated by those skilled in the art.

The features of the invention will be readily understood from the accompanying drawings illustrating the preferred form of the invention, and the following detailed description of the construction therein shown.

In the drawings, Figure 1 is a view in side elevation of a machine embodying the invention; Fig. 2 is a plan view of the head of the machine; Fig. 3 is a sectional view taken substantially on the line 3-3 of Fig. 2; Fig. 4; is a sectional view taken substantially on the line 4=4 of Fig. 2; Fig. 5 is a detail view, in side elevation, illustrating certain parts of the stopping mechanism, and Fig. 6 is a sectional view taken substantially on the line 6-6 of Fig. 2.

In the drawings the invention is illus trated as embodied in a welt and turn Specification of Letters Patent.

DRIVING AND STOPPING MECHANISM.

Patented Oct. 12, 1920. Divided and this application filed October 2,

sewing machine having the same construction as the machine illustrated and described in, applicants pending application, Serial 'No. v95,893, filed May 6, 1916, of which the present application is a division, and the slow speed driving mechanism and the mechanism for controlling its operation are constructed and arranged to reverse the cam shaft in stopping the machine, so that the needle is retracted While its hook is empty and is brought to rest in position where it does not interfere with the removal of the shoe. It will be understood, how-, ever, that the mechanismillustrated, as well as the invention embodiedtherein, is not confined in its application to amachine of this character, but may be used in other machines and in other relations.

Referring to Fig 1 of the drawings, the machine therein illustrated is driven during the sewing operation through a belt pulley 2 securedto the end of the cam shaft 4' and connected by a driving belt 6 with a pulley 8 mounted onxa shaft 10 in the base. of the machine. The pulley 8 is connected through the beveled gears 12' with a sleeve 14 mounted on a driving shaft 16 and carrying one member 18 of the main driving clutch. The driving shaft 16 carries the other member 20 of the clutch, and also carries the driving pulley 22 through which motion is imparted to the driving shaft. The engagement of the members of the driving clutch is cont-rolled through a treadle 24 connected with the clutch operating wedge 26. When the treadle is depressed, the members of the driving clutch are forced into engagement, and the machine is driven at a speed dependent upon the pressure which the operator applies to the treadle. \Vhen the treadle is released the clutch members are disengaged thereby, disconnecting the cam Shaft from the driving shaft.

The upward movement of the treadle when it is released also throws into operation mechanism which reverses the cycle of operations of the stitch forming mechanism to cast off the thread from the needle, and which brings the machine to rest with the parts in proper position for the removal of the shoe. This mechanism in the construction shown comprises a friction clutch V in place on the rim 46 with a shoulder 52,

Q ,7 I I l I p 7 1,355,156

which is normally disengaged, but which is engaged upon the release of the treadle.

The driving member of the clutchrotates in a direction reverse to the direction of' rota-- tion ofthe cam shaft of the machine, and when the clutch is engaged, the driving member first acts on the driven member of the clutch as a brake to arrest the rotation thereof and of the cam shaftto which it is fixed, and then, as a driver to drive the driven member and the cam shaft in a reverse direction to stopping position. The driving member 28 of the slow speed clutch (see Figs. 2,3, 5 and 6) is loosely mounted on the cam shaft of the machine and is formed on its periphery with spiral teeth 30 meshing with theteeth of a spiral driving pinion 32 secured toa shaft 84. The shaft 34 is continuously driven from the driving pulley by means of a belt 36 passing over a pulley 38 fixed to the outer end of the shaft, and over a pulley 40 formed on the driving pulley 22. The driven member of the slow speed clutch, indicated at 42, is carried by a sleeve 44 which isloosely mounted on the hub of the driving member 28 of the clutch,

and is free to slide axially thereof to en- 7 gage and disengage the clutch. The clutch members are constructedto secure a particularly eflicient clutching action when they are engaged, and to obviate all objectionable sticking of the clutch when the driven member is shifted to disengage the clutch. 1

The driven clutch member-comprises a rim 46 having an exterior cone-shaped face and a split clutch ring 48 keyed to the rim and having an interior cone-shaped face fitting against. the exterior face of the rim. The clutch ring 48 is connected to rotate with the rim by key 50 mounted in the rim and projecting outwardly therefrom between the ends of the ring. This key is preferably arranged obliquely to the axis of the clutch, so that the clutch ring will be given a slight rotary movement when the rim is moved axially with relation to the ring. The clutch ring is formed with an exterior clutchface arranged to engage the interior clutch face of the driving member 28 of the slow speed clutch The elements of the engaging faces of the rim 46 and the clutch ring have a greater inclination to the axisof the clutch than the elements of the outer or clutch face ofthe ring and the clutch face of the driving clutch member which it engages. :The clutch ring'is held on the ring engaged with a flange 54 on the rim by a retaining ring 56 having a flange 58 engaging in a groove in the clutch ring. The retaining ring 56 is supported by screws 60 passing through perforations in the rim 46-and threaded into the retaining ring, and the ring 56 is pressed against the clutch ring to holdthe clutch ring in position on the rim 46 by coiled springs 62 seated in recesses in the rim and acting against the heads of the screws. clutch ring in which the flange'58 engages is somewhat wider. than the flange to permit the clutch ring to contract and expand relative to the retaining ring. This construction enables the driving and. driven members of the clutch to be formed with their elements inclined at a much smaller angle to the axis of the clutch than is usual in clutches of this character without causing any objectionable sticking of the clutch when it is disengaged. Withthis construction the clutch rin is normall held in the The groove in the gitudinally of the cam shaft to disengage the clutch, if there is any undue friction between the clutch surfaces of the clutch ring and thedriving member of the clutch tending to resist this movement, the rim 46 will-move axially to a slight extent independently of the ring to disengage the outer face of the rim from the interior cone face of the ring, this movementof the rim independently of the ring being permitted by the yielding of the spring 62. hen'the outer face of the rim is disengaged from the ring, the ring is permitted to contract slightly so as to relieve the friction be tween its clutch face and the clutch face of the driving member of the clutch and thus allow the clutch to be readily disengaged. After the clutch is disengaged, the ring is restored to its normal position on the rim 46 by the action of the springs 62.

While the sleeve 44 is free to slide on the hub of the driving clutch member longitudinally of the cam shaft, it is connected to rotate with the shaft by means of a lug 64 projecting from the pulley 2 and engaging between lugs 66 formed on the sleeve.

The sleeve is normally held in position on the hub of the driving clutch member with the members of the clutch disengaged by a spring 48 seated in a recess or bore in the pulley 2 and acting against the head of a pin 70 passing through the spring and through an opening in the pulley and threaded into the sleeve 44. 7

When the clutch members 28 and 42 are engaged, they first act on the cam shaft as a friction brake to absorb the energy due to momentum, and after the forward move ment of the cam shaft has ceased, the clutch acts to turn the shaft in a reverse direction at a comparatively slow speed until the clutch is disengaged, when the cam shaft is brought to rest with the needle and other parts of the stitch forming mechanism in the pro er position for the removal of the shoe. he mechanism for engaging and disengaging the clutch at the proper times in the rotation of the cam shaft comprises a cam groove 72 formed in the sleeve 14: and engaged by a roll 74 on one arm of a bell crank lever 76. The other-arm of the bell crank lever is provided with a hole 78 adapted to receive a locking pin 80 which is normally held out of engagement with the lever so that, during the normal running of the machine, the lever is oscillated idly by the cam. The locking pin is mounted on one end of a. slide 82 which is held in normal position by a spring 84. The spring surrounds a bolt or rod 86 extending from the forward end of the slide, and is interposed between a shoulder on the slide and the inner end of an adjustable screw threaded sleeve 88 surrounding the rod and threaded into the frame of the machine. The movement of the slide under the action of the spring 84 is limited by the engagement of a stop nut 90 threaded on the forward end of the rod 86 with the forward face of a bracket 92 on the frame through which the rod passes. By adjusting the sleeve 88 the tension of the spring may be varied, and by adjusting the nut 90 the slide may be adjusted to bring the locking pin into proper position to register with the hole in the end of the lever 76. The locking pin is forced in a direction to engage its upper end in the opening in the arm of the bell crank lever by a spring 94, and the lower end of the pin is connected with the treadle 241 so that the pin is held down out of engagement with the bell crank lever as long as the treadle is depressed and the main driving clutch is engaged to drive the cam shaft of the machine. A latch 96 is also connected with the lower end of the locking pin, and is arranged to engage a shoulder 98 on the slide 82 and hold the locking pin in lowered position during the movements of the treadle imparted by the operator in varying the speed of the machine at different po1nts 1n the sewing operation. In the constructlon shown, the latch 96 is loosely mounted on a shaft 100 carried in a block 102 secured to the lower end of the locking pin. The hub of the latch is formed with spaced lugs 1041 fitting between corresponding lugs 106 on the hub of an arm 108 pivoted on the shaft 100. As will be noted from an inspection of Fig. 3, the lugs 10 1 on the hub of the latch are somewhat narrower than the spaces between the lugs 106 on the hub of the arm 108, so that there is a certain amount of lost motion between the arm and the latch when the arm is turned about the shaft; The arm 108 is connected b a treadle rod 110 with the treadle 24L. W hen the treadle is depressed the arm 108 turns on the shaft 100, and through the engagement of the lugs 106 on the arm with the lugs 104: on the hub of the latch 96, the latch is turned until it brings up against the slide 82 and then, during the continued downward movement of. the treadle, the locking pin'is drawn down against the tension of its spring. During the downward movement of the locking pin the latch 96 is depressed until its upper end is carried beneath the shoulder 98 on the slide. During the variations in the positions of the treadle occurring during the sewing operation for the purpose of varying the speed of the machine, the engagement of the latch with the shoulder 98 maintains the locking pin out of engagement with the hole in the arm of the bell crank .76. When the treadle is released, the latch 96 prevents the upward movement of the lockingpin until the lugs 106 on the hub of the arm 108 strike the lugs 104 on the hub of the latch and swing the latch outward, thus disengaging it from the shoulder 98. Then this takes place, the spring 94 forces the locking pin upward against the under side of the bell crank lever, and when the hole in the lever registers with the pin, the pin snaps upward into the hole, thus connecting the lever with the slide, 82. I

The cam 72 is so timed that the hole in the end of the arm of the bell crank lever is brought into position to register with the locking pin at the proper time in the cycle of operations of the stitch forming mechanism. WVhen the pin is engaged with the hole in the arm of the bell crank lever, the lever is held from movement about its pivot and the cam 72, acting on the roll 74, carried by the lever, shifts the sleeve 44 to bring the members of the slow speed clutch into engagement. When the lever and slide 82 are locked together by the locking pin, the movement of the lever is resisted by the spring 84, and the force with which the members of the friction clutch are pressed together will depend upon the compression of the spring. This may be adjusted to se cure the desired braking effect between the members of the friction clutch, so that the forward rotation of the cam shaft will be arrested within the desired part of a revolution. In theconstruction shown, the parts are so timed and controlled that the looking pin is engaged with the lever, and the friction clutch engaged, while the needle is retracted, and just before it begins its advance movement, and the forward rotation of the cam shaft is arrested after the needle has advanced and enters the work. The clutch then acts to turn the cam shaft in a reverse direction at slow speed until the shaft arrives at the point where the cam 72 acted to engage the members of the clutch, when the reversely moving cam acts again to disengage the clutch members. 7

When the, slow speed reversing clutch is disengaged, the reverse, movement of the cam shaft is arrested by a friction brake so as to prevent any accidental over-running of the shaft. In the constructionshown, this friction brake comprises a pair of brake shoes 112 and 114 (see Fig. 4) mounted within the laterally projecting flange 116 formed on the pulley 2,- the brake shoes being arranged to engage the interior surface of the flange. The lower ends of the'brake shoes are connected by a toggle comprising pivotally connected links 118 and 120, which toggle is operated to engage the brake shoes with the brake flange 116v and to disengage the brake, shoes therefrom at the proper times. Attheir upper ends, the brake shoes are supported and guided upon pins 122 projecting laterally from a block 124 (see Fig. 6). The upper end faces of the brake shoes are held by a spring 126 against an eccentric head 128 formed on a pin or rod 130 passing through an opening in the block 124 and through an opening in the head of a draw bolt 132 which engages in. a recess in the block. The draw bolt is mounted in a slot in the frame of the machineand a nut 134 is threaded on the upper end of the bolt. The draw bolt acts to secure the block 124 to the frame and to clamp the pin 130, so as to maintain the brake shoes in adjusted position. By loosening the nut 134 the pin 130 is unclamped and by applying a screw driver to the slotted head 128 the pin 130 may be turned to adjust the brake shoes with relation to the brake flange 116. Upon the reversal in the direction of rotation of the cam shaft the brake shoes are engaged with the brake flange to arrest the reverse rotation of the cam shaft after the j disengagement of the driven member of the slow speed reversing clutch from the driving member. By illll'lll'lg the eccentric head 128 to adjust the brake shoes, the po v sition in which the cam shaft is finally brought to rest may be regulated or compensation made for wear of the brake sh es and brake flange. The brake shoes are dis engaged from the brake flange as the treadle is depressed by the operator to start the machine so that the cam shaft is freed from the action of the brake when the shaft is connected with the main drivingmechanism and the machine may be started without undue resistance. The mechanism for actuating the toggle to engage the brake shoes with the brake flange comprises a link 136 pivotally connected at its upper end with the central joint 138 of the toggle, a lever .140, a link 142' connecting the rear end of the lever with the lower end of the link 136, a rod 144 pivotally connected to the forward end of the lever and passing at its upper end through an opening in an arm 146 of a bell crank lever 148, and a spring 150 interposed between the arm 146 and a collar 152 held in position by a nut threaded on the rod. The movement of the rod through the opening in the arm 146 is limited by a collar 154 mounted on the rod to engage the under side of the arm. The lever 148 is oscillated by a swinging arm 156 such asis ordinarily employed in tension release mechanisms pivotally connected with the lower arm 157 of the lever and adapted to with a collar 166 clamped von the treadle rod 110 (see Fig. 1) As the rotation of the cam shaft is reversed upon stopping the machine the movement of the lever 1 48, produced by the oscillation of the swin in arm 156 acts through the rod 144, to actuate the lever 14() and. depress the link 142 and the link 136 connected therewith. The downward movement of the link 136 tends to straighten the toggle consisting of the links 118 and 120 and the

brake shoes

112 and 114 are engaged with the brake flange 116 by the movement of the toggle. The frictional engagement hetwcen the brake shoes and the brake flange arrests the rotation of thecam shaft after the slow speed reversing clutch is disengaged. Asthe treadle is depressed to start the machine through the connection between the lever 158 and the treadle rod, the lever is swung in a direction to throw the link 160 toward the rear of the machine. Thi movement of the link 160 swings the link 142 about its pivotal connection with the lever 140 and elevates the link 136 to diminish the angle between the toggle links 118 and 120 and thereby release the brake shoes from the brake flange. W hen the main driving clutch is engaged to start the machine the cam shaft is entirely freed from the resistance of the brake.

It is understood that the invention is not limited to the particular construction of the illustrated embodiment thereof but that it may be embodied in other forms within the.

- ing, in combination, a shaft, driving mechanism for the shaft, and brake mechanism for the shaft comprising a member having a brake flange connected to rotate with the shaft, brake shoes arranged to engage the brake flange, fixed guiding pins extending through slots in the upper ends of the brake shoes, means whereby the upper ends of the brake shoes may be adjusted with relation to each other and maintained in adjusted position, and mechanism for actuating the lower ends of the brake shoes to engage them with and to disengage them from the brake flange.

2. Driving and stopping mechanism having, in combination, a shaft, driving mechanism-for the shaft, and brake mechanism for the shaft comprising a member having a brake flange connected to rotate with the shaft, brake shoes arranged within the brake flange, guides for the upper ends of the brake shoes, a bolt having an eccentric surface against which the upper ends of the brake shoes rest, means whereby the bolt may be rotatably adjusted to adjust the upper ends of the brake shoes, means for maintaining the brake shoes in adjusted position, and means for separating and bringing together the lower ends of the brake shoes to engage them with and to disengage them from the brake flange.

3. Driving and stopping mechanism having, in combination, a shaft, driving mechanism for the shaft, means for connecting the shaft with the driving mechanism and disconnecting it therefrom, and mechanism for finally arresting the rotation of the shaft, comprising a member having a brake flange, and connected to rotate with the shaft, brake shoes arranged to engage the brake flange,

'a toggle connecting the lower ends of the brake shoes, and connections for actuating the toggle to cause the brake shoes to engage the brake flange whenthe shaft is disconnected from the driving mechanism and for actuating the toggle to disengage the brake shoes from the brake flange before the shaft is connected with the driving mechanism upon starting the machine.

4. Driving and stopping mechanism having, in combination, a shaft, high speed forward and low speed reverse driving mechanism therefor, means for connecting the shaft with the driving mechanism and disnecting it therefrom, a friction brake for stopping the shaft when the reverse driving mechanism is thrown out comprising a member having a brake flange and connected to rotate with the shaft, brake shoes arranged to engage the brake flange, a toggle connecting the lower ends of the brake shoes, and connections for actuating the toggle to apply the brake shoes to the brake flange upon the reversal of the direction of rotation of the shaft and for actuating the toggle to release the brake shoes from the brake flange before the shaft is connected with the high speed driving mechanism upon starting the machine.

5. Driving and stopping mechanism having, in combination, a shaft, high and low speed driving mechanism therefor, means for connecting the shaft With the driving mechanism and disconnecting it therefrom,'a friction brake for stopping the shaft when the low speed driving mechanism is thrown out comprising a member having a brake flange and connected to rotate with the shaft,brake shoes arranged to engage the brake flange, a toggle connecting the lower ends of the brake shoes, and connections for actuating the toggle to apply the brake shoes to the brake flange while the shaft is rotating under the influence of the low speed mechanism and to disengage the brake shoes from the brake flange before the shaft is connected with the high speed mechanism upon starting the machine.

6. Driving and stopping mechanism having, in combination, a shaft, driving mechanism-for the shaft, a treadle for controlling the connection of the shaft with the driving mechanism, means for finally arresting the rotation of the shaft, comprising a member having a brake flange and connected to rotate with the shaft, brake shoes for engaging the brake flange, a toggle connecting the lower ends of the brake shoes, a toggle actuating member for actuating the toggle to cause the brake shoes to engage the brake flange when the shaft is disconnected from the driving mechanism, pivotally connected links of different lengths, a connection between one of the links and the central joint of the toggle, a connection between the other link and the toggle actuating member, and means for swinging the pivotal connection between the links about the connection between one of the links and the toggle actuating member to actuate the toggle to release the brake shoes from the brake flange upon the actuation of the treadle to connect the the machine.

WILLIAM C. MEYER.