US1994595A - Stopping device for looms or the like - Google Patents

Description

March 19, 1935.

v E. (3. SMITH ET AL 1,994,595-

STOPPING DEVICE FOR LOOMS OR THE LIKE Filed June 15, 1952 3 Sheets-Sheet l March 19, 1935. E. c. SMITH ET AL I 1,994,595

STOPPING DEVICE FOR LOOMS OR THE L I KE w Filed June 15, 1952 s Sheets-Sheet 2 v .77 a v if March E. C.SMITH El AL 1,994,595

STOPPING DEVICE FOR LOOMS OR THE LIKE Filfi June 15, .1952 5 Sheets-Sheet 3 jz z niargz- Patented Mar. 19, 1935 UNITED STATS] orries" STOPPING'DEVICE FOR LOOMS R THE LIKE Edwin C. Smith, Providence, and Walter J. McLaughlin, lPawtucket, R1,, assignors, to

Rhode Island Warp StopEquipmentCompany, 1 Portland, Maine,-a corporation of Maine Application June 15, 1932, Serial No. 617,308.

20 Claims. (01. 192-125) V Our invention is an improved electrical stopdevice for looms and other machines. The purpose of the device is to provide a cam-operated knocleofi with no continuously moving parts aside from the calm, as well as to providefor certainty of of our device with for; and 1 Figs. 3, 4, 5 andffi illustrate successive stages of operation of the device.

. Referring to Figshl and 2, the bottom shaft 20f a loom carriesa cam 3. Adjacent said cam is a casing 4 carried on a bracket& which in turn is secured to the loom-side 6. Mounted in the casing is a stud 7 upon which the hub 9 of a cam-follower 8 is pivoted.

The cam-follower 8'is normally withheld from engaging the cam 3, by a detent-member l0 hav-' ing a hook 11 which engages withthe top tip 12 of a cross-arm 13 on the cam follower 8. S115- pended from the detent 'by means of a connecting link 14 is a pawl 15 having an upwardly extending hook 16 which is normally positioned just below the bottom tip 1'7 formed at the opposite end of the cross-arm 13. a

The pawl 15'is mounted on an arm 18 of the rock shaft 19, the arm carrying at its lower extremity a pin 20 which projects through a transverse slot 21 in the pawl. The arm 22 of the pawl 15, between its slotted end and the pin 23, by which it is connected with the detent 10 through the connecting link 14:, is relativelyheavy as compared with the hooked portion 24 on the opposite side of the suspension pin 23. The effect of this distribution of mass is to hold the hook 16 upward so that if lifted, it engages the tip 17 when the latter moves in a clockwise direction as Viewed in the drawings. The hook l6 may also yield'to the pressure of the tip 17 when the latter moves in the opposite direction but returns under the counterbalance actionto, engage said tip at the proper time.

The surface 51of the tip 17- is inclinedwith respect to the coasting surface 52 of the hook 16 to provide that when the follower 8 descends the secured to the casing 4.

cross-arm 13 moves in a contra-clockwisedirection "and the surface 51 acts cam-fashion on the surface 52 to depress the pawl '15' andpermit engagement of the tip 1''! andhook 16.

The detent 10 is mounted on a pin25 at the top 5 of a lever 26. The lever is substantially U-shaped in outline to adapt it to pass by the rock shaft 19 and its bearing and position the M1025 over the rock shaft 19 and the pin 20. The lever 26 is positioned behindthe arm 18 and swings on a pivot- .10 pin 27 also located at the rear of the arm 18 and t On the arm 18 isa pro ectionpr pin 28 which engages a slot 29 in the detent-lever' 26.

Through this connectionrotative movement of 15 the arml8 causes concurrent movement ofthe detent-lever 26 and the detentlO connected thereto. A greater extent of movement is effected than would ensue were the detent-lever 26 an extension of the arm 18. On the rock shaft 19' and pref- 120 erably located at the rear of the casing l'is a knock-off lever 30 which, through the means of a knock-off rod 31, acts upon the stopping mechanism of the loom, see Fig. 2. The stopping mechanism usually comprises a starting-handle 32, a 25 roller rod 33, a loop, so called, 34 and alock orclutch-leVer 35. A support or bearing 36 attached .to the loom at a convenient point supports the knock-ofi rod 31 adjacent the loop'34. ,Onthe knock-01f rod 31 is a dog 38 which nor- .30

.mally abuts the side of the loop 34 when the loom is in operation. Pressure of the .dog 38 against the loop 34 moves the latter-and, causes release of the stopping apparatus and arrestment of the loom. Pressure of the dog 38 thereagainst .35

is effected by the cam.3 in raising the follower 8 with the pawl 15 engaged with the tip 17 of the follower cross-arm 13, the tip 17 moving in the direction of the arrow a. A sufficient extent of movement of the dog 38 under the action of the cam 3 is less than the movement of the loop 34 after the release of the stopping apparatus. Consequently, after such stopping effect has been secured the loop 34 recedes from thedog38, re-

lieving the pressure between the tip 17 and the A5 hook 16 and permitting the pawl 15 to fall away freely from engagement with said tip,

Engagement of the hook 16 of the pawl 15 with the tip 17 is effected by means of .amagnet 39 secured to the top of the casing 4. Themagnet '50 as herein shown is of the solenoid type having a plunger 40 to whichis attached the pawl 15 by means of a suspensionelink 41. The lower end of the link ll is preferably fittedto the same pin ,23 that pivotally asecuresthe connecting-link 14 vof contact with the insulated --currence of faulty performance. by the loom reextending between the pawl 15 and the detent 10. The detent 10 acts to control the movement of both the follower 8 and the pawl 15. When in the position shown in Figs. 1, 2 and 3, the detent 10 withholds the follower from engaging the cam and also holds the pawl in readiness to engage the bottom tip 17. When the detent l0 is-raised and the follower has been released with the curved edge 42 of the detent resting on the tip 12, the tip 12 of the follower catch to restrain the pawl 15 from disengagement with the bottom tip 17 of the follower even though the circuit may have been opened or broken and the magnet rendered inactive and inoperative to hold the pawl 15 to its operative engagement with the tip 17. v

The electrical circuit of which the magnet winding is a part is diagrammatically represented in Fig. 2. The source of electrical energy is here indicated conventionally as a transformer 43 with secondary or stop-motion winding 44.

One'side 45 of the circuit is grounded at a convenient ,point'46 in the loom while the other side 47 extends through a switch 48 and thence to the -magnet 39. From the magnet it extends to the controlling point which is here shown as the insulator member 49 of a drop-wire contact-bar.

- This contact-bar is secured to the loom side 6 by metallic brackets, notherein shown, andthe body 50 of the contact-bar is also secured thereto and .consequently grounded. The drop-wire 51 which constitutes the agent for closing the circuit when the loom is running is normally suspended out leases the drop-wire 51 causing it to close the circuit between the body 50 and insulated member :49 of thecontact-bar. This causes our stoppingdevice to function to arrest the operation of the loom.

Stopping of the loom automatically opensthe electrical circuit at the switch 48 through the means of a clutch-lever 35 acting upon the lever 55 of. the switch .48. As shown in Fig. 2, the clutch-lever 35 acts upon the switch-lever 55 to close the circuit. Whenthe loom stops, the end of the'clutch-lever 35 recedes fromthefswitchlever 55-permitting the switch to open the circuit. The construction of the parts of the loom above described are well known to those versed in the art and therefore need no further description herein.

Figs. 3, 4, 5 and 6 depict the successivestages in the cycle of operations. Fig. 3 shows the parts in normal position with the loom operating withoutfaults or circumstance of action calling for arresting the operation of the loom through the means of our device. As before explained the follower 8 is withheld from the cam 3 by the hook '11 of the detent 10. 1

Referring to Fig. 4, one of the drop-wires 51 has been released by the yarn drawing therethrough and through means above described the pawl 15 is raised. In rising, the hooked end of the pawl encounters the bottom tip 1'7 of the follower cross-arm 13 so that the counterweighted arm 22 is raised with the pin 20 riding in the slot 21. The raising of the pawl 15 causes concurrent raising of the detent 10 through the means of the connecting link 14. As the-detent 10 is raisedthe follower 8 is released so thatit falls upon the cam 3, the top tip 12 of the follower cross-arm 13 following the curved under edge or surface 42 of the detent. Should the' electric circuit open even momentarily, the'engagement acts as a detent or member 49. Oc-

of the top tip 12 of the follower cross-arm with the curved edge 42 of the detent 10 will hold the 16 into position to be engaged by the tip 17 when 1 said tip is'moved by the cam 3 in'the direction as. indicated by the arrow at. As illustrated in Fig. 6 the cam 3 during its rotation raises the end of the follower 8 and the tip 17 acts to pull the'pawl 15 and rock the lever 18. The shaft 19 is thus given a slight rotative movement to cause stopping of theloom' through movement of the knock-off lever .30 and knock-01f rod 31 in the manner as before described. Such movement of the rock-shaft 19 with itsarm 18 effects longitudinal movement of the detent '10 in the'direction of the arrow 2) and causes the hook 11 of the detent 10 to override the tip 12 and drop thereover. When the loom is again started by operating the loom handle 32 the loop 34' is pushed against the dog '38 to cause movement of the knock-off rod 31 and lever'30in the direction of the arrow d. This motion imparts to .the detent lever 26 movement in the opposite direction.

The hook 11 of thedetent 10 being engaged-with the tip 12 of the follower 8 raisesthe latter from the path of the cam and the parts are restored,

to the normal position depicted in Fig. 3.

Obviously our invention as described is susceptible of constructional variation and embodi-.

ment in mechanical equivalent of what-we'have shown and described. Therefore, without limiting ourselves tothe precise structure rangement set forth, we claim:

1. In an electrical stop-device, the combination with the stopping apparatus of a machine, and an operative shaft of said machine, of a cam on said shaft, a follower operative from said cam, means connecting the follower with the stopping apparatus aforesaid, a detentto withhold the follower from the cam to render the cam.in-' capable of acting on said stopping apparatus, and means to release said followerto secure action of the cam on said stopping apparatus. j

2. In an electrical stop-device, the combination with the stopping apparatus of a machine, an operative shaft of said machine, and a cam on said shaft, of a follower operative from said earn, a detent to restrain thefollower from such operation, asuspension link on saiddetent, a member suspended by said link out of reach of the follower, means intermediate said suspended member and the stopping apparatus by which the cam can act upon said stopping apparatus, a

magnet to concurrently release the detent from the follower and bring the suspended member" within reach of the follower, and means to connect themagnet and the suspended member..-

3. In an electrical stop-device, the. combination with a cam, and means to'operate the cam, .of a follower, a detent to withhold the follower from the cam, which detent has a surface which rides upon thefollower to hold the detent in 1 and arraised position while the cam operates on the gage the follower, a connection between the magnet and the hook, and a detent connected with the hook under which a part of thefollower passes to hold up the detent and retain the hook in position to engage said follower.

5. In an electrical stop-device, the combination with a cam follower, a cam, means for operating the cam, and a member to be moved by the cam, said member having a projection, of a pawl having a hook at one end and a transverse slot at the opposite end engaging the projection on the member to be moved, the slotted portion being heavier than the hooked portion, a magnet to raise the pawl to encounter the follower and to be moved thereby, and a suspension link extending from the magnet to the pawl and connecting with said pawl at a point such that the heavy slotted end counterbalances and holds up the hooked end.

6. The combination of a cam, a follower for the cam, and a detent to engage the follower, said detent formed with one surface to restrain the follower from movement and another surface by which to be restrained from movement by the follower.

7. The combination of acam, a follower operative from the cam, and a pawlfor engaging the follower, said pawl formed with a hook at one end, a transverse slot at the opposite end and a point of suspension between the hook and the slot such that the slotted end tends to overbalance the hook end and hold it in raised position.

8. The combination of a cam, a follower operative from the cam, said follower formed with a hub and a follower portion extending from said hub and with a cross-arm at the hub having two tips, a detent cooperating with one tip of the follower to restrain the latter from action and a pawl cooperating with the other tip of the follower to transmit action.

9. In an electrical stop-device, the combination with a cam follower, a cam, and means to operate the cam, of a member to be moved by the cam through the follower, a pawl carried by said member and engageable with said follower, a lever adjacent the member to bemoved, connections between the member and lever, a detent mounted at the top of said lever to control the follower, and means to lift both detent and pawl.

10. In an electrical stop-device, the combination with a cam follower, a cam,.and means to operate the cam, of a detent to withhold the follower from the cam, said detent mounted adjacent the follower, and means to move said detent longitudinally to vary its position in respect to the follower.

11. In an electrical stop-device, the combination with a cam follower, a cam, meansto opcrate the cam, and a detent having a formation to restrain the follower from engaging said cam, of a lever on which said detent is mounted, and means to vibrate said lever to impart longitudinal movement to said detent to vary the position of its detent formation relative to the position of the follower. I

12. In an electrical stop-device, the combination with a stop-member to be moved, a cam, its follower, and connections between said follower and stop-member, of a lever, means to oscillate the lever from said stop-member, and a detent carried by the lever to engage the follower and withhold it from engaging the cam.

13. The combination with a cam, and a follower operated thereby, of means having a detent formation to engage and restrain the follower from following the cam, said means having a surface'to ride on the follower when the latter is following the cam whereby to'prevent the detent from returning to its restraining position, and means to move the detent to release the follower.

14. A cam follower forcam-operated devices,

, said follower having a hub with a portion extending in one direction from said hub and a crossarm at said hub extending from either side of said first portion, which cross arm has hooked extremities.

15. In a cam-operated device, a cam, a cam follower formed with a hub with an arm extending substantially radially from said hub and a cross-arm adjacent the hub extending transversely of the first arm, one extremity of said cross-arm formed to prevent the cam-following arm from followingthe cam, and the other extremity of the cross-arm formed. to transmit movement of the cam follower under action of said cam.

16. As a new article of manufacture, a transmission member formed with a hooked extremity, a transverse slot at its oppositeextremity, which slot receives the mounting on which thetransmission member is swung into operative position, and. with a suspension formation intermediate the extremities by which the transmission member is swung upon the axis of aforesaid mounting into operative position and on the axis of which suspension formation the transmission member swings to yield its hooked extremity to operative action.

17. In a stop-device, the combination of a moving element, a transmission member formed with a hooked extremity at one end for engaging the moving element, and means for suspending the transmission member to permit rise and fall of its hooked extremity, the opposite end of the transmission member being transversely slotted and counterweighted to hold the hooked extremity in a given position.

18. In a stop-device, the combination of a cam, a cam-follower having a cross-arm projecting therefrom through which action of the cam is transmitted and means engageable with the cross-arm of the cam-follower to withdraw and withhold the follower from the action of the cam.

19. In a stop-device, the combination of a moving element, a stop-element movable therefrom, and a pawl for transmitting motion from said moving element to the movable element, said pawl having two axes of oscillation to adapt it to swing about one axis to carry it into operative position and about the other axis to effect operative engagement with the movable element after having been swung on the first-named axis.

20. In a stop-device, the combination of a moving element, a transmission member, a movable member to which motion is transmitted from the first element by the transmission member, said transmission member formed at one extremity with means to encounter and engage said moving element and having a formation at the.

opposite extremity by which it is maintained in engagement with the movable member with freedom of transverse movement thereon, and means for suspending said transmission member at a point intermediate said extremities to adapt it to swing, about its point of suspension to effect engagement with said moving element.

EDWIN C. SMITH.

WALTER J. MoLAUGHLIN.

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