US1802434A - Driving and stopping mechanism for sewing machines - Google Patents

Description

April 28, 1931. w 3 LONG ET AL 1,802,434- DRIVING AND STOPPING MECHANISM FOR SEWING MACHINES Filed May 9, 1927 2Sheets-Sheet 1 ll ,I!! h- A r l 28, 1-931. B. LONlG ET AL 1,802,434

I DRI VING AND STOPPING MECHANISM FOR SEWING MACHINES Filed May 9, 1927 v 2 Sheets-Sheet 2 3, Patented Apr. 28, 1931 ltiTlZ STARS 1,8tZA34 IVILLIAIK B. LONG- AND PEILIP B. CLARK, OF CHICAGO, ILLINOIS, ASSIGNOR-S TO UNION SPECIAL IVIAQHIIT COIvIPANY, OF CHICAGO, ILLINOIS, A CORIBRA'IION OF ILLINOIS DRIVING AND STGPPING IvIECI-IANISM FOB.- SEVVIHG MACHINES Application filed May 9, 1927. Serial No. 189,997.-

The invention relates to new and useful improvements in driving and stopping mechanism for an actuated shaft, and more particularly for the actuated shaft of a sewing machine.

An object of the invention is to provide mechanism of the above type which includes means for positively stopping the actuated shaf at a predetermined point in its cycle of rotation, and which also includes a driving member adapted to be clutched to and unclutched from the actuated shaft, and a belt wheel having frictional contact with the driving member for rotating the same.

A further object of the invention is to provide a driving mechanism for an actuated shaft which includes a driving member having a surface concentric to the axis of the actuated shaft, a plate carried by the actuated shaft and having a surface eccentric to the axis thereof, a roller adapted to be moved along said eccentric surface into and out of gripping contact with the driving member, means for yieldingly forcing the roller into gripping contact, and a shiftable member rotating with the actuated shaft and adapted to be engaged by a stop mechanism for stopping the actuated shaft, said shiftable member also operating to move the roller out of gripping contact.

A still further object of the invention is to provide a driving and stopping mechanism of the above type, with means for preventing retrograde movement of the actuated shaft, which means also functions as a yielding retarding means for stopping the actuated shaft.

A still further object of the invention is to provide a driving and stopping mechanism wherein a stop bar is spring-pressed into position for stopping the actuated shaft, and is held out of stopping position by a control disk.

A still further object of the invention is to provide a driving and stopping mechanism of the above type, wherein the control disk is turned step by step for each rotation of the actuated shaft, and means is provided for preventing overthrow of the control disk.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by way of illustration one embodiment of the invention Figure 1 is a side view of a portion of a sewing machine having the improved driving and stopping mechanism applied there- 2 is a sectional view on the line 22 of Fig. 4c; i

Fig. 3 is a sectional view'on the line 33 of Fig. 1;

Fig. 4 is a view similar to Fig. 3, but showing a portion of the pawl and the actuating eccentric therefor removed;

Fig. 5 is a view partly in section and partly in side elevation, showing the belt wheel, the driving and the actuating devices;

Fig. 6 is a perspective view of the clutching devices, the parts being separated for the sake of clearness;

Fig. 7 is a sectional view on the line 7-7 of Fig. i;

Fig. 8 is a sectional view on the line 88 of Fig. 4, and

Fig. 9 is a perspective view of the stop bar. 7

The invention is directed to a driving and stopping mechanism for an actuated shaft,

and more particularly to a mechanism for operating the main shaft of a-sewing machine. The driving and stopping mechaism includes a driven member attached to the actuating shaft, and a driving'member freely mounted on the actuated shaft.- The driving member is driven by a belt wheel, which has a frictional driving engagement therewith, so that if, for any reason, the actuated parts are stopped prematurely or too suddenly, the belt wheel can turn relative to the driving part when said driving part is still clutched to the actuated shaft. Between the driving member and the actuated shaft is a clutch device which includes a plate rigid with the actuated shaft having a surface which is eccentric to the axis of the shaft. The driving member has a surby a face which is concentric to the axis of the driving shaft. Between these surfaces is a roller which is adapted to be moved into gripping contact with the driving member or out of gri ping contact therewith. A spring normally tends to force the roller into gripping contact. A shiftable plate forces the roller out of gripping contact. This shiftable plate is the element which stops the actuated shaft at a predetermined point. Vhen it engages a stop bar, it must first move the roller out of gripping contact, and the movement of the roller is limited by a shoulder on the plate which is fixed to the actuated shaft, and there fore, through the combined action of the shii'table plate, the roller and the stop shoulder, the actuated sha t is stopped at a redetermined point in its cycle of ro tation. There is also a plate freely mounted on the actuated" shaft which drops in behind the stop bar for preventing retrograde movement of the actuated shaft. This plate engages the stop and is yieldingly pressed against the stop so that when the end of the bar rides over the plate into stopping position, the bar will, through the plate, retard the rotation of the actuated shaft to a certain extent. The stop bar is spring-pressed into stopping position, and is held out of stopping position by a rotating control disk provided with a notch into which a lug on the bar is adapted to move when the disk reaches a predetermined point. The disk is stepped around by a pawl actuated by the eccentric on the actuated shaft, and a brake shoe yieldingly pressing against the control disk prevents any overthrow. V

Referring more in detail to the drawings, the improved driving and stopping mecha nism is shown applied to a sewing machine 1 having a main shaft 2 which is actuated driving mechanism. The driving mechanism includes a driving member 3 which is in the form of a ring carried by a disk 4, The disk t is mounted to turn free- 1yon the actuated shaft. Alongside of the disk carrying the driving ring is a belt pulley 5, and between the belt pulley and the driving ring is a friction pad 6. The belt pulley is carried by a hub? which is integral with the CliSkL A spider spring 8 bears against the belt pulley and forces the belt pulley; laterally into frictional driving contact with the friction disk and the driving ring. The spider spring is held pressed against the driving pulley by means of a nut 9 which is threaded on to the hub 7 of the driving pulley. On the outer end of the actuated shaft 2 there is a knurled collar 10 secured thereto by a set screw 11. This is for the purpose of turning the actuated shaft; when disconnected from its driving mechanism.

into gripping position.

hiounted on the actuated shaft is a collar 12 carrying a radially projecting plate 13. This collar 12 is rigidly secured to the actuated shaft by a set screw 1%. The inner surface of the driving ring is concentric to the axis of the shaft 2. The surface on the plate 13 is eccentric to the axis of the actuated shaft. The left-hand end of this surface 15, as, viewed in Fig. 4:, is a greater distance away from the center of the shaft than the right-hand surface thereof. Between the concentric surface on the driving ring and the eccentric surface 15 is a clutch roller 16. This clutch roller, when at the left-hand end of the surface 15, as viewed in Fig. at, will grip the driving ring so that the plate 13 and the actuated shaft 2 will be driven from said driving ring. A spring 17 mounted on a stud 18 carried by a lateral extension of the plate 13, bears against the roller 16 and normally forces the roller over The roller 16 has an annular groove 19 formed therein intermediate its ends, and the spring 17 lies in this annular groove, and will serve to prevent the roller from slipping endwise off from the surface 15.

The combined releasing and stopping lever 20 is freely mounted on the actuated shaft 2. This lever is provided with a rib 21 at its free end which moves into the annular groove 19 when the end of the lever is forced against the roller, and this serves as a further means for preventing the roller from moving endwise. This lever moves the roller along the surface 15 out of gripping contact with the driving ring. This occurs only when the stop bar engages the end 22 of the releasing lever and makes a stop lover of it. The stop bar is indicated at 23 in the drawings, and at times is raised into the path of rotation of the end 2'22 of the stop lever. In Fig. 3 of the drawings, the stop lever is shown retracted so as to free the parts and permit the roller to clutch the driving ring to the actuated shaft. In Fig. i, the. stop lever is raised so that the end 22 of the stop lever strikes the end of the stop bar, and this will force the upper end of the stop lever into contact with the roller and force the roller to the right-hand end of the eccentric surface 15 against the action of the spring 17. This moves the parts out of gripping relation.

At the right-hand end of the eccentric surface 15, the radial plate 13 is provided with a stop shoulder 24. When the roller 16 engages the stop shoulder 2%, it can move no further along the eccentric surface. This stop shoulder being formed on the radial plate 13, is rigidly attached to the actuating shaft. The stop bar has stopped the movement of the stopping lever 20, and therefore, when the roller comes in contact with the shoulder, the roller and the actuated shaft can turn no further, and will be stopped with the needle of the sewing machine at a predetermined point in its reciprocation. This enables the machine to be stopped with the needle raised so that the material may be readily removed from the machine. The extension 25 of the radial plate 13 carries a retarding lever arm 26. Said lever arm is pivoted at 27 to the extension. The spring 17 bears against a stud 28 on the upper end of this lever arm, and normally presses the same into contact with the stop lug 29 on the extension. The actuated shaft turns in the direction of the arrow in Fig. 4, and therefore, when the stop bar is raised, it first contacts with this yielding lever arm 26 and will turn the same on its pivot against the tension of the spring 17. This slightly retards the machine. The stop bar slips off from the end of the lever arm 26 and engages the stop lever 20. This causes the roller to be disengaged from the driving member and move over against the shoulder on the plate 13 carried by the actuated shaft, and thus bring the actuated shaft to a standstill, as noted above. The lever arm 26 will move to the right of the stop bar as viewed in Fig. 4:, so that the upper end of the stop bar is held between the stop lever 20 and this lever arm 26, and this not only stops the actuated shaft, but prevents any re-bound or reverse movement of the actuated shaft. This further insures that the needle will stop at a given point in its path of reciprocation.

The stop bar is normally spring pressed upward by means of a spring 30. This spring 30 is attached to a lug 31 at the lower end of the stop bar 23. It is also attached to a headed stud 32 mounted on the outer end of a fixed stub shaft 33 which in turn is carried by a bracket 34: attached to the base of the machine 1. The stop bar is provided with an elongated slot 35 through which said stub shaft 33 extends. This serves also as a guiding stud for the vertical reciprmzations of the stop bar. A second guiding stud bolt 36 passes through an elongated slot 37 in the stop bar and is threaded into the bracket Mounted on the stub shaft 33 is a control disk 38. This control disk is provided with a notch 39 which is adapted to receive a lug 1O on the stop bar 23. This disk 38 is turned in the direction of the arrow (Fig. 3) by means of a pawl &1 formed at the outer end of an eccentric strap cooperating with an eccentric -12 on the actuated shaft 2. Fixed to toe disk 38 is a ratchet wheel with which the pawl 41 coo aerates. 'A spring 44 operates to hold the pawl in engagement with the ratchet. A bracket plate l5 is secured to the bracket and is provided with an opening 16 through which the pawl 41 projects.

A brake shoe 47 is pivoted at 48 to an arm 19 carried by a sleeve 50 mounted on the stud bolt 36. A spring 51 attached to the bracket 34: and to an arm projecting from said sleeve 50 normally forces the brake shoe 4'? into contact with the disk 33, and prevents any overthrowbeing given to the disk by the actuating pawl 4-1. The stop bar is depressed by a treadle connected to an arm 52 carried by the stop bar through a flexible connection A stop screw 54 carried by an arm 55 formed as a part of the bracket 3 1, lies in the path of movement of the arm 52, and limits the upward movement of the stop bar through the action of the spring 30.

When the stop bar is depressed, and the driving member is thus connected up to the actuated shaft through the spring 17, the roller 16 and radial plate 13 carried by the actuated shaft, the machine is set into operation, and the actuated shaft will continue to rotate, and at each rotation, will turn the ratchet wheel 42 one step through the pawl 11. This turning of the ratchet wheel wil cause the rotation of the control disk. The lug l0 on the stop bar bears against the outer face of the control disk, if the treadle is released, but the stop bar cannot be moved a sufiicient distance to stop. the machine until the notch 39 reaches a position so that the lug 10 may pass into the same. The entering side of the notch is. cut away at 56 to insure that the lug will get into the notch, but the stop bar performs no releasing or stopping action until the lug is fully seated in the notch. Then it is that the upper end of the stop bar engages the stop lever 20, forces the roller out of contact with the concentric surface on the driving member, and over against the stop shoulder on the radial plate 13, thus stopping the actuated shaft.

It will be noted from above, that the control disk, in one sense, counts the number of rotations of the actuated shaft'before the machine is stopped. This control disk can be readily removed from the machine another substituted therefor, if it is desired to change the number of complete rotations of the shaft w iich occur before the machine is stopped.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims. 7

Having thus described the invention, what we claim as new and desire to secure by Letters Patent, is

1. A stopping and driving mechanism including a driving member, an actuated shaft, means for connecting said driving member to said shaft, means for disconnecting said shaft from said driving member and 4 teams;

stopping the same in a predetermined position, a driving pulley, and means for frictionally connecting said driving pulley to said driving member,

2. A stopping and driving mechanism 1ncluding, a driving member, an actuated shaft, means for connecting said driving member to said shaft, means for disconnecting said shaft from said driving member and stopping the same in a predetermined position, a driving pulley, and means for frictionally connecting said driving pulley to said driving member, said last-named means including a spring spider adapted to engage the face of the pulley and force the same into frictional engagement With said driving member.

3. A stopping and driving mechanism including I a driving member, an actuatec shaft, means for connecting said driving member to said shaft, means for disconnecting said shaft from said driving member and stopping the same h a predetermined position, a driving pulley, means for frictionally connecting said driving pulley to said driving member, said stopping means including a bar yieldingly pressed into position to disconnect and stop said shaft, a control disk for holding the bar in ineffective position, and means operated by said shaft for turning said control disk step by step to position for releasing said bar.

4. A stopping and driving mechanism including a driving member, an actuated shaft, means for connecting said driving member to said shaft, means for disconnecting said shaft from said driving member and stoppingthe same in a predetermined position, a driving pulley, means for frictionally connecting said driving pulley to said driving member, said stopping means including a bar yieldingly pressed into position to disconnect and stop said shaft, a control disk for holding the bar in ineffective position, means operatedby said shaft for turning said control disk step by step to position for releasing said bar, and means for breaking the rotation of said control disk.

5. A driving and stopping mechanism for sewing machines comprising a driving member, an actuated shaft, said driving member having a concentric oriving ring, a radial plate carried by said actuated shaft and located Within said ring, said radial plate having an eccentric surface thereon, a roller adapted to be moved along said eccentric surface into gripping contact with the concentric surface of said driving ring, a spring for moving said roller into gripping contact, a stop lever for moving said roller out of gripping contact, said radial plate having a shoulder adapted to be en gaged by said roller for stopping said actuated shaft, and a stop bar movable into the path of rotation of said stop lever for dissurface into gripping contact with the concentric surface of said driving ring, a spring for moving said roller into gripping contact, a stop lever for moving said roller out of gripping contact, said radial plate having a shoulder adapted to be engaged by said roller for stopping said actuated shaft, and a stop bar movable into the path of rotation of said stop lever for disconnecting and stopping the actuated shaft, said radial plate having a yielding member adapted to engage the stop bar on the opposite side thereof from said stop lever for preventing re-bound.

7. A driving and stopping mechanism for sewing machines comprising a driving member, an actuated shaft, said driving member having a concentric driving ring, a radial plate carried by said actuated shaft and located Within said ring, said radial plate having an eccentric surface thereon, a roller adaptedto be moved along said eccentric surface into gripping contact with the concentric surface of said driving ring, a spring for moving said roller into gripping contact, a stop lever for moving said roller out of gripping contact, said radial plate having a shoulder adapted to be engaged by said roller for stopping said actuated shaft. a stop barmovable into the path of rotation of said stop lever for disconnecting and stopping the actuated shaft, a spring for normally raising said stop bar, a control disk for limiting the upward movement of said stop bar, and means operated by said actuated shaft for turning said control disk step by step.

8. A driving and stopping mechanism for sewing machines comprising a driving memher, an actuated shaft, said driving member having a concentric driving ring, a radial plate carried by said actuated shaft and located Within said ring, said radial plate having an eccentric surface thereon, a roller adaptedto be moved along said eccentric surface into grippin contact with the concentric surface of said driving ring, a spring for moving said roller into, gripping contact, a stop lever for moving said roller out of gripping contact, said radial plate having a shoulder adapted to be engaged by said roller for stopping said actuated shaft, a stop bar movable into the path of rotation of said stop lever for disconnecting and stopping the actuated shaft, a spring for normally raising said stop bar, a conl'Sll trol disk for limiting the upward movement of said stop bar, means operated by said actuated shaft for turning said control disk step by step, and a lug carried by said stop bar and said control disk having a notch adapted to receive said lug.

9. A driving and stopping mechanism for sewing machines comprising a driving member, an actuated shaft, said driving member having a concentric driving'ring, a radial plate carried by said actuated shaft and located within said ring, said radial plate having an eccentric surface thereon, a roller adapted to be moved along said eccentric surface into gripping contact with the concentric surface of said driving ring, a spring for moving said roller into gripping contact, a stop lever for moving said roller out of gripping contact, said radial plate 7 having a shoulder adapted to be engaged by said roller for stopping said actuated shaft, a stop bar movable into the path of rotation of said stop lever for disconnecting and stopping the actuated shaft, a spring for normally raising said stop bar, a control disk for limiting the upward movement of said stop bar, means operated by said actuated shaft for turning said control disk step by step, a lug carried by said stop bar and said control disk having a notch adapted to receive said lug, a brake shoe for said control disk, and means for yieldingly holding said brake shoe in continuous contact with said control disk.

10. A driving and stopping mechanism for sewing machines comprising a driving member, an actuated shaft, said driving member having a concentric driving ring, a radial plate carried by said actuated shaft and located within said ring, said radial plate having an eccentric surface thereon, a roller adapted to be moved along said eccentric surface into gripping contact with the concentric surface of said driving ring, a spring for moving said roller into gripping contact, a stop lever for moving said roller out of gripping contact, said radial plate having a shoulder adapted to be engaged by said roller for stopping said actuated shaft, a stop bar movable into the path of rotation of said stop lever for disconnecting and stopping the actuated shaft, a spring for normally raising said stop bar, a control disk for limiting the upward movement of said stop bar, means operated by said actuated shaft for turning said control disk step by step, a lug carried by said step bar and said control disk having a notch adapted to receive said lug, a brake shoe for said control disk, means for yieldingly holding said brake shoe in continuous contact with said control disk, an adjustable stop for limiting the upward movement of said stop bar, and a treadle connection for depressing said stop bar.

11. A driving and stopping mechanism including a driving element, a driven element, means for connecting and disconnecting said elements, one of said elements being provided with a cylindrical face adapted to be engaged at any point thereon by said connecting means and means operating through said means for disconnecting said elements for stopping the driven element when the same is disconnected from the driving element.

12. A driving and stopping mechanism including a driving element, a driven element, means for connecting and disconnecting said elements, one of said elements being provided with a cylindrical face adapted to be engaged at any point thereon by said connecting means, said connecting means including a member circular in cross section adapted to engage adjacent faces of said elements and means operating through said means for disconnecting said elements for stopping the driven element when the same is disconnected from the driving element.

13. A driving and stopping mechanism including a driving element, a driven element, means for connecting and disconnec ing said elements, one of said elements being provided with a cylindrical face adapted to be engaged at any point thereon by said connecting means, said connecting means including a member circular in cross section adapted to engage adjacent faces of said elements, means normally tending to urge said circular member into connecting relation between said elements and means operating through said means for disconnecting said elements for stopping the driven element when the same is disconnected from the driving element.

In testimony whereof, we aflix our signatures.

WILLIAM B. LONG. PHILIP B. CLARK.

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