US3462798A - Lap stop motion apparatus - Google Patents

Description

Aug. 26, 1969 H. w. GROCE' 3,462,798

LAP STOP MOTION APPARATUS Filed Jan. 29, 1968 2 Sheets-Sheet 1 Kiwi;

8- 26, 1969 H. w. GROCE LAP srror MOTION APPARATUS 2 Sheets-Sheet 2 Filed Jan. 29, 1968 v INVENTOR: HOMER W. GROCE- ATTORNEY United States Patent 3,462,798 LAP STOP MOTION APPARATUS Homer W. Groce, 115 Wellford Road, Lyman, S.C. 29365 Filed Jan. 29, 1968, Ser. No. 701,397 Int. Cl. Dlllg 31/00 US. Cl. 19-.25 9 Claims ABSTRACT OF THE DISCLOSURE Stop motion apparatus for the lap in a carding machine which includes a clutch normally connecting the lap feed means to driving means together with sensing means This invention relates to textile carding apparatus and more particularly to a stop motion apparatus for interrupting the advance of lap from the lap roll in a carding machine prior to depletion of the lap.

In the typical carding machine in use today throughout the textile industry, textile material in the form of a web or lap is processed in a carding operation to produce a sliver for subsequent processing into textile yarn. The lap supply is generally in the form of a roll wound on a pin or rod which is supported on the carding machine for unwinding as it is processed into sliver. The lap roll is generally supported for unwinding on suitably driven rolls which engage the outer periphery of the wound lap so that the rod on which the lap is wound moves downwardly as the lap is unwound. As is well known, the depletion of the lap roll, as the lap is unwound and processed into sliver, requires periodic replacement of the depleted roll with a full lap roll. This roll replenishment, of necessity, requires a temporary interruption in the operation of the carding machine and attendant sliver production to permit the insertion of the new lap roll. Furthermore, it is the common practice to replace the depleted lap roll with a new roll before complete depletion of the lap to avoid processing the last few yards of lap in the carding machine. It is not common for the tail end of the lap to contain impurities such as oil, foreign matter and the like which, if processed in the carding machine, not only tends to reduce the quality of the resulting sliver but on occasion may even cause damage to the card elements from jerk-ins etc. Furthermore, the physical characteristics of the tail end of the lap are usually different from the major portion of the lap which if processed into sliver produces undersirable lack of uniformity in the resulting sliver.

As the vertical position of the lap pin or rod is a direct indication of the amount of lap remaining on the rod, the position of the rod can be utilized to determine when the substantially depleted lap roll is to be doffed and a new lap roll positioned on the machine. Consequently, it has proposed to utilize this lap rod movement for gradually moving a member suih as a pawl into the path of a rotating component of the carding machine so that when this pawl has been moved by the lap rod into a predetermined position, the pawl is moved to the necessary extent for initiating the interruption of the carding operation such as by actuation of a belt shifter or the like.

However, with such an arrangement, it can be understood that this gradual engagement of the pawl or similar device results in continuous engagement between the pawl and rotating component prior to completion of the "ice pawl movement to the actuating position with attendant wear on the interengaging parts. As can be understood, this prior engagement, produces excessive wear on the interengaging parts and brings about the need for periodic replacement of the parts with attendant lost production time and additional expense from the standpoint of labor and materials expended adding to the cost of operation of the carding machine. In addition, this wear interferes with the control of the length of the tail end portion of the lap remaining on the rod so that shutdown of the carding machine for lap roll dofling at the desired moment is ultimately prevented. Furthermore, reversal of the lap feed means such as feed rolls to remove slugs, etc. from the rolls can be accomplished only with considerable difficulty in conventional apparatus and under lap overload conditions lap feed rolls of present day carding machines are subjected to considerable stress.

Accordingly, a primary object of this invention is to provide a new and novel lap stop motion apparatus for a carding machine for the processing of a wide variety of types of textile fibers.

Another object of this invention is to provide a new and novel lap stop motion apparatus for a textile carding machine which operates quickly and positively to interrupt the advance of the lap to leave a lap tail end portion of a predetermined length on the lap roll.

Still another object of this invention is to provide an apparatus for interrupting the advance of lap on a textile carding machine which responds to a selected position of the lap rod with the virtual elimination of any wear between the parts and which may be reset manually in a quick and easy manner.

A further object of this invention is to provide a new and novel lap stop motion apparatus for a textile carding machine which may be adjusted over a wide range to interrupt the advance of the lap with a predetermined length of lap end remaining on the lap roll.

Still another object of this invention is to provide a new and novel lap stop motion apparatus for a textile carding machine which eliminates sliding engagement between moving parts prior to interruption of the advance of the lap and which permits manual interruption of the advancing lap and reversal of the direction of lap advance.

A still further object of this invention is to provide a new and novel lap stop motion apparatus for a textile carding machine which permits overrunning of the lap advancing means by the driving means upon the presence of a predetermined excessive load.

Other objects and advantages of the invention will become apparent from the following description taken in connection with the accompanying drawings.

The objects stated above and other related objects in this invention are accomplished by the provision of clutch means for drivably connecting driving means to lap feed means on a textile carding machine provided with means for supporting a lap roll having a lap rod for unwinding of the lap and for movement of the lap rod in a substantially vertical plane. The clutch means includes a pair of clutch members and means are provided for normally maintaining the pair of clutch members in driving engagement. An actuating member is arranged for reciprocating movement between an inoperative position with the clutch members in driving engagement and an operative position for disengaging the clutch members to disconnect the lap feed means from the driving means. Sensing means are also provided which are normally conditioned inoperatively and which are operatively conditioned by the lap rod at a selected vertical position of the lap rod during the downward movement of the lap rod as the lap is unwound. Actuating means, controlled by the sensing means, are provided for moving the actuating member into the inoperative and operative positions and the actuating means are arranged to respond to the operative conditioning of the sensing means by the lap rod to move the actuating member from the inoperative position into the operative position and to respond to the normal inoperative conditioning of the sensing means to move the actuating member from the operative position into the inoperative position.

The novel features which are believed to be characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, both as to its organization and method of operation may be best understood by reference to the following description taken in conjunction with the accompanying drawings in which:

FIGURE 1 is a perspective view of the lap stop mtion apparatus of the invention in association with a textile carding machine;

FIGURE 2 is a side view of the apparatus of FIG- URE 1;

FIGURE 3 is a plan view of the apparatus of FIG- URE 1; and

FIGURE 4 is a sectional view taken substantially along line 44 of FIGURE 3 in the direction of the arrows.

As generally illustrative of the invention, there is shown in FIGURE 1 a lap stop motion apparatus constructed in accordance with the invention together with various component parts of a textile carding machine of conventional construction. As is well known, such a textile carding machine includes a frame designated generally by the numeral 11 on which is positioned a lap stand 12 having a vertically extending recess 13 for accommodating the lap rod or pin 14 on which is wound a roll 16 of textile web material referred to generally as a Slap-7 The carding machine includes lap support rolls 17 driven by suitable means (not shown) and rotatably supported by means such as a shaft 18. The lap roll 16 is supported in a well known manner with its outer surface 16a in engagement with the periphery of the driven rolls 17 which are preferably provided with flutes 17a as shown. Rotation of the rolls 17 rotates the lap roll 16 in the direction of the arrow I to permit the lap L to advance in the direction of the arrow P through the lap feed means which include a feed roll 19 and a feed plate 21.

The lap L, advanced between the roll 19 and plate 21, is fed in a well known manner to the lickerin 22 having a shaft 23 supported for rotation in bearings 24 suitably supported as shown on the card frame 11 for subsequent processing in the carding machine and for conversion into sliver in the well known manner.

As specifically illustrative of the invention, driving means are provided for the lap feed means which, in the illustrated embodiment, includes a bevel gear 26 rotatably mounted on a shaft 27 connected to the lap feed roll 19. The bevel gear 26 is preferably retained on the shaft 27 by means of an end cap 28 suitably secured to the shaft by means such as bolt 29 as shown best in FIG- URE 4. The bevel gear 26 is provided in a well known manner with peripheral teeth 26a for engagement with a bevel gear 31 driven by suitable means (not shown) for rotation of the bevel gear 26 and feed roll 19 in the direction of the arrow R. The shaft 27 is suitably supported on the card frame 11 by means such as a yoke 32 arranged to accommodate a bearing sleeve 33 positioned on the shaft 27 as shown in FIGURE 1.

Means are provided for drivably connecting the driving means or bevel gear 26 to the lap feed means which includes clutch means designated generally by the numeral 34 having a pair of clutch members 36, 37 as shown best in FIGURE 4. Clutch member 36 is mounted on the hub 38 of the bevel gear 26 for rotation therewith by means such as a key 39. Clutch member 37 includes a stationary portion 41 and a movable portion 42 which are provided with central bores 41a, 42a respec tively to permit the clutch member portions to be mounted on the shaft 27 as shown in FIGURE 4. The stationary portion 41 of clutch member 37 is provided with a radially extending internally tapped hole 43 for accommodating a set screw 44 for fixably securing the portion 41 in a selected axial position on the shaft 27. The movable portion 42 of clutch member 37 is preferably pivotally mounted by means such as a pivot rod 46 on the stationary portion 41 for pivotal movement in the direction of the double arrow S of FIGURE 4 and interengaging surfaces 47, 48 are provided on the adjacent faces of the clutch member 36 and movable portion 42 of clutch member 37 respectively which engage to drivably connect the bevel gear 26 to the lap feed roll 19.

Means are provided for normally maintaining the clutch members 36, 37 in driving engagement to drive the lap feed roll 19 with the bevel gear 26. More specifically, a spring 51 is provided having one end received within a recess 52 in stationary portion 41 of clutch member 37 and with the other end in yieldably urging engagement with the movable portion 42. The recess 52 is preferably internally tapped to threadedly accommodate an adjustably positioned set screw 53. Thus, the force yieldingly urging the movable portion 42 to the left as viewed in FIGURE 4 for mutual driving engagement of the interengaging surfaces 47, 48 may be predetermined by selecting the axial position of the set screw 53 in the recess 52.

As will be explained in detail hereinafter, at least one cam 54 is mounted on the movable portion 42 of clutch member 37 and, in the illustrated embodiment, two of such cams 54 are provided having oppositely directed camming surfaces 54a and 54b.

The interengaging surfaces 47, 48 of the clutch members 36, 37 formed in the preferred embodiment, by recess 57 and a lug 56 respectively include surfaces inclined oppositely the normal direction of rotation of the clutch members, as indicated by the arrow R, to thereby permit the clutch members to disengage during the driving of the lap feed roll 19 upon the presence of a predetermined excess load on the lap feed means. As shown best in FIGURE 1, inclined surface portions 47a, 48a are provided which interengage upon receipt of the lug or tooth 56 on the movable portion 42 of the clutch member 37 into the corresponding recess 57 in the clutch member 36. It should be understood that although only a single lug 56 and recess 57 is shown in the illustrated embodiment, additional lugs and recesses may be provided and/or the movable portion 42 of clutch member 37 may be completely detached from stationary portion 41 for axial movement on the shaft 27 if desired.

As can be understood, means are provided for predetermining the amount of overload on the lap feed roll 19 and feed plate 21 at which the surfaces 47a, 48a disengage to permit the bevel gear 26 and clutch member 36 to overrun the clutch member 37 to provide the desired overload protection. More specifically, the position of the set screw 53 determines the amount of force exerted by the spring 51 against the movable portion 42 of clutch member 37 to thereby determine how much load must be applied to feed roll 19 before the clutch members separate for the overload protection feature to become operative.

The interengaging surfaces 47, 48 also include surfaces 47b, 48b which extend parallel to the axis of rotation of the clutch members 36, 37 for positively locking the clutch members together during the rotation of the clutch member in the opposite direction from the normal direction of rotation indicated by the arrow R. Thus, when the rotation of the lap feed roll 19 is to be reversed for removal of slugs, etc. from between the roll 19 and feed plate 21, the bevel gear 26 may be rotated by hand after having been previously disconnected from its driving means (not shown) together with the feed roll 19, the

clutch members 36, 37 being maintained in driving engagement by the surfaces 47b, 48b.

In order to disengage the clutch members 36, 37 to disconnect the lap feed roll 19 from the bevel gear 26 an actuating member, designated generally by the numeral 58, is suitably positioned for reciprocating movement between an inoperative position with the clutch members 36, 37 in driving engagement as shown in FIGURE 1 and an operative position for disengaging the clutch mem' bers as shown in FIGURE 3. More specifically, the actuating member 58 includes a rod 59 supported for axial reciprocating movement, as indicated by the double arrow T in FIGURE 1, in a bore 60 provided in a bracket designated generally by the numeral 61 and suitably supported on the card frame 11. One end of the rod 59 is provided with a cam follower 62 which is maintained in spaced apart relationship with the cams 54 on the clutch means 34 in the inoperative position of FIGURE 1 and which is moved into the rotary path of the cams 54 in the operative position of FIGURE 3 for disengaging the clutch members 36, 37 and disconnecting the bevel gear 26 from the lap feed roll 19.

As has been previously explained, the vertical position of the lap rod 14 is a direct indication of the amount of lap L remaining on the roll 16 and sensing means are provided which are normally conditioned inoperatively during the unwinding of the major portion of the lap L from the roll 16 and which is operatively conditioned by the lap rod 14 at a selected vertical position of the lap rod during the downward movement of the lap rod as the lap is unwound. The sensing means is preferably in the form of a substantially L-shaped, pivotally movable lever 64. The lever 64 includes a portion 64a extending Within a bore 66 of the bracket 61 for rotation therein and a portion 64b which is arranged to be engaged by the rod 14 during its downward movement for downward pivotal movement of the lever 64. In the position shown in FIG- URE 1, lever 64 is in the normal inoperatively conditioned position prior to engagement by the rod 14.

Actuating means are provided which are controlled by the sensing means or lever 64 for moving the actuating member or rod 59 into the inoperative and operative positions of FIGURES 1, 3 respectively which actuating means are arranged to respond to the operative conditioning of the lever 64 by the lap rod 14 during the lap rod downward movement to move the rod 59' from the inoperative position into the operative position and to respond to the normal inoperative conditioning of the lever 64 to move the rod 59 from the operative position into the inoperative position. More specifically, the actuating means include spring means which in the preferred embodiment is an overcenter or toggle spring 68 as shown best in FIGURE 2 which is controlled by the position of the lever 64.

The overcenter spring 68 is arranged to automatically shift the rod 59 to either side of an imaginary dead center line in accordance with the position of the lever 64 thereby shifting and yieldingly urging the rod 59 into either the inoperative or operative positions. More specifically, the spring 68 is fixedly supported at one end by means such as a pin 69 fixedly connected to a portion 76 on bracket 61. The other end of the spring 68 is connected for overcenter movement to a radially extending pin 71 mounted adjacent the end of the rod 59 opposite the cam follower 62.

An arm 72 having an arcuate slot 73 through which the pin 71 extends is adjustably connected adjacent the end of portion 64a of lever 64 in angularly disposed relationship therewith as shown best in FIGURE 2. More specifically, arm 72 is provided with an opening 74 for receiving the lever portion 64a and the arm 72 is clamped adjustably to the lever portion 64a in a selected angular relationship by means such as a clamping bolt 76 which cooperates with a yoke 72a on the arm 72. As can be understood, the pin 71 on the rod 59 is arranged to be engaged by opposite ends 73a, 73b of the arcuate slot 73 on arm 72 and thereby move the spring 68 overcenter on opposite sides of an imaginary dead center line in a toggle action to shift the rod 59 into either the inoperative and operative positions of FIGURES l, 3 respectively and to yieldingly maintain the rod 59 into either of these positions.

As will be explained in detail hereinafter, in the depressed position of the lever 64, the spring 68 moves overcenter on one side of the imaginary dead center line to move the rod 59 into the operative position as shown in FIGURE 3 and in the elevated position of the lever 64, the spring 68 moves on other side of the dead center line to move the rod 59 into the inoperative position of FIGURE 1.

In the operation of the invention, the carding machine in which the invention is incorporated is operated in the conventional manner to unwind the lap roll 16 supported on the suitably driven rolls 17 with the lap L being fed into the lickerin 22 of the machine through the nip of the lap feed roll 19 and lap feed plate 21 wtih the feed roll 19 driven by the bevel gear 26 as described above. A driving connection between the bevel gear 26 and feed roll 19 is maintained by means of the urging force of spring 51 against the movable portion 42 of clutch member 37 so that the tooth 56 is received within the recess 57 of clutch member 36.

During the processing of the lap L in the carding machine, the lever 14 has been manually pivoted to the elevated position as shown in FIGURE 1 so that the overcenter spring 68 has moved overcenter to the left as viewed in FIGURE 1 to shift and yieldingly bias the rod 59 into the inoperative position of FIGURE 1 with the cam follower 62 out of the rotary path of the earns 54 on the clutch portion 42 during the rotation of the clutch means 34.

As has been previously explained, the lap rod 14 is initially in vertically spaced relationship with the lever portion 64b in the elevated position of the lever 64 as a result of the length of lap L on the lap roll 16. As the lap roll is unwound and the lap is depleted, the lap rod 14 moves vertically downward within the lap stand slot 13 to engage lever portion 64b and pivot the lever 64 downwardly shortly before the lap roll is completely depleted or when a predetermined relatively short tail end portion of the lap remains on the rod 14.

The pivoting of the lever 64 downwardly rotates the arm 72 attached thereto so that the end 73a of the arcuate slot 73 engages the pin 71 on the rod 59 to move the spring 68 overcenter. As is well known, as soon as the spring 68 moves overcenter to the right as viewed in FIG- URE 1, the pin 71 together with the rod 59 is shifted positively and quickly to the right as permitted by the slot 73 to move the cam rod 59 from the inoperative position of FIGURE 1 into the operative position of FIGURE 2 whereby the cam follower 62 is positioned within the rotary path of the earns 54. As shown in FIGURE 2, the movement of the pin 71 under the toggle action of the spring 68 is permitted by the arcuate slot 73 as the pin 71 moves from the slot end 73a within the slot into engagement with the opposite end 73b of the slot.

The movement of the cam follower 62 into the rotary path of one of the cams 54 brings about an engagement with the cam inclined surface 54a so that as the follower 62 rides on the surface of cam 54, the movable portion 42 of clutch member 37 is pivoted to the right as viewed in FIGURE 4 disengaging the tooth 56 on movable portion 42 from the recess 57 of clutch member 36 disconnecting the bevel gear 26 and the feed roll 19. The advance of the lap L is thereby interrupted and suitable means (not shown) are preferably provided for simultaneously interrupting the rotation of the rolls 17 t0 terminate the rotation of the lap roll 16.

The lap rod 14 with the relatively short tail end of lap L still remaining thereon may then be removed and a new lap roll 16 positioned on the support rolls 17. The lever 64 may then be pivoted upwardly manually from the depressed position of FIGURE 2 to the elevated position of FIGURE 1 as permitted by the now elevated position of the new lap rod 14. During this upward pivotal movement of the lever 64, the engagement of the pin 71 with the slot end 731: moves the toggle spring 68 to the left as viewed in FIGURE 2 overcenter so that the cam follower 62 is withdrawn from the rotary path of the cam 54 quickly and positively as the pin 71 moves within the slot 73 into engagement with opposite end 73a of the slot 73 under the toggle action of the spring 68 thereby restoring the driving connection between the feed roll 19 and the bevel gear 26 as the portion 42 of clutch member 37 and clutch member 36 re-engage.

It can be seen that there has been provided with the novel construction of this invention a lap stop motion apparatus which is simple and inexpensive in construction and may be easily installed on textile carding machines of conventional construction. An outstanding feature of the invention is the elimination of premature contact between the moving parts of the apparatus until actuation by the lap roll rod at which time the advance of the lap is quickly and positively interrupted for simple and easy replacement of the depleted lap roll by a new lap roll.

The apparatus of the invention is extremely reliable so as to always interrupt the lap advance with a predetermined lap tail end portion remaining on the rod thereby eliminating improper sliver formation, damage to the card elements and the like. Furthermore, the apparatus of the invention is adjustable so that the length of the lap tail end portion remaining on the rod when interruption occurs may be predetermined within precise limits. Another outstanding feature of the invention is the ease with which the lap feed means may be reversed, by the operator for the removal of slugs etc. and, at the same time, an overload feature is incorporated in the invention which provides overload protection for the lap feed means which may be adjustably set over a wide range.

While there has been described what at present is considered to be the preferred embodiment of the invention, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the invention and, therefore, it is the aim of the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Having thus described the invention, what is claimed is:

1. A lap roll stop motion of a textile carding machine having means for supporting a lap roll having a lap rod for unwinding of said lap and for movement of said lap rod in a substantially vertical plane and lap feed means for advancing lap unwound from said lap roll for processing of said lap in said carding machine comprising, in combination, driving means for said lap feed means, means for drivably connecting said driving means to said lap feed means including clutch means, means for normally maintaining said clutch means in driving engagement to drive said lap feed means with said driving means, said clutch means including a clutch having a pair of members, said clutch members being normally maintained in drivingengagement by said maintaining means, a cam mounted on one of said clutch members for rotation therewith, an actuating member arranged for reciprocating movement between an inoperative position with said clutch means in said driving engagement and an operative position for disengaging said clutch means to disconnect said lap feed means from said driving means, a cam follower mounted on said actuating member, said cam follower being positioned in the rotary path of said cam in the opera tive position of said actuating member for camming said clutch members out of said driving engagement to thereby disconnect said lap feed means from said driving means, sensing means normally conditioned inoperatively and operatively conditioned by said lap rod at a selected vertical position of said lap rod during the downward movement of said lap rod as said lap is unwound, actuating means controlled by said sensing means for moving said actuating member into said inoperative and operative positions, said actuating means being arranged to respond to the conditioning of said sensing means by said lap rod during said lap rod downward movement to move said actuating member from said inoperative position into said operative position and to respond to the normal inoperative conditioning of said sensing means to move said actuating member from said operative position into said inoperative position.

2. A lap roll stop motion in accoradnce with claim 1 wherein said actuating means include spring means controlled by said sensing means for yieldingly biasing said actuating member in one direction and for shifting said actuating member from said inoperative position to said operative position in said one direction upon the operative conditioning of said sensing means by said lap rod and for yiedingly biasing said actuating member in the other direction and for shifting said actuating member in said other direction from said operative position to said inoperative pOsitiOn upon the normal inoperative conditioning of said sensing means.

3. A lap roll stop motion in accordance with claim 2 wherein said spring means comprise an overcenter spring, said overcenter spring being arranged to automatically shift said actuating member to either side of an imaginary dead center line in accordance with the conditioning of said sensing means and thereby yieldingly urge said actuating member into either said operative or inoperative positions.

4. A lap roll stop motion apparatus in accordance with claim 2 wherein said sensing means include a pivotally mounted lever operatively associated with said actuating means, said lever extending within the vertical path of said lap rod for engagement by said lap rod during said downward movement for movement of said lever by said lap rod to a depressed operatively conditioned position to control said actuating means and shift said actuating member from said inoperative position to said operative position, said lever being manually movable to an elevated inoperatively conditioned position to control said actuating means and shift said actuating member from said operative position to said inoperative position.

5. A lap roll stop motion in accordance with claim 4 wherein said actuating member includes a rod, means for supporting said rod for axial reciprocating movement between said inoperative and operative positions and wherein said cam follower is mounted adjacent one end of said rod, a radially extending pin on said rod adjacent the other end of said rod, said spring means including a spring, means for fixedly supporting said spring at one end, said spring being connected at its other end to said pin for overcenter movement to automatically shift said rod to either side of an imaginary dead center line and thereby yieldingly urge and shift said rod into either said operative or inoperative positions, means for supporting said lever for pivotal movement between said depressed and elevated position, an arm having an arcuate slot mounted on said lever in angularly disposed relationship therewith, said pin being arranged to extend through said arcuate slot for engagement by the opposite ends of said slot during the movement of said lever into said depressed and elevated positions to thereby move said spring overcenter on opposite sides of an imaginary dead center line to shift and yieldingly maintain said rod in said operative and inoperative positions respectively.

6. A lap roll stop motion in accordance with claim 5 including means for adjustably connecting said arm to said lever for positioning said arm in a selected angular relationship with said lever whereby the vertical position at which said lap rod engages said lever may be predetermined.

7. A lap stop motion in accordance with claim 2 including a plurality of interengaging surfaces on the adjacent faces of said clutch members for connecting said clutch members together in said driving engagement, said interengaging surfaces including surfaces inclined oppositely the normal direction of rotation of said clutch members during the driving of said lap feed means to thereby permit said clutch members to disengage upon the application of a predetermined excessive load on said lap feed means.

8. A lap roll stop motion in accordance with claim 7 wherein said interengaging surfaces also include surfaces parallel to the axis of rotation of said clutch members for positively locking said clutch member together during the rotation of said clutch members in the opposite direction from said normal direction of rotation.

9. A lap roll stop motion in accordance with claim 8 wherein said one clutch member includes a stationary portion and a movable portion and wherein said cam and said interengaging surfaces for said one clutch member are provided on said movable portion and including a shaft connected to said lap feed means, means for detachably securing said stationary clutch member portion to said shaft in a selected axial position, and said means for normally maintaining said clutch means in driving engagement including a spring associated with said stationary and movable portions for yieldingly urging said movable portion towards said other clutch member to yieldingly maintain said interengaging surfaces on said clutch members in said driving engagement.

References Cited UNITED STATES PATENTS 457,354 8/1891 Lawry 19-.25 3,276,080 10/1966 Scarborough 19.25

DORSEY NEWTON, Primary Examiner

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