US1185094A - Filling-replenishing mechanism for looms. - Google Patents

Description

U. HEBFRT.

FILLING REPLENISHING MECHANISM FOR LOOMS.

APPLICATION I'ILED IAN.2I, I9I6.

Patented May 30,

2 SHEETS-SHEET Inventor. UImId I'IeIoevI U. HEBERT.

FILLING REPLENISHING MECHANISM FOR LOOMS.

APPLICATION FILED JAN-2|. I9l6- Patented May 30, 1916.

2 SHEETS-SHEET 2- Inventor. Ubuloi Heberf WWWIM Aftys.

. Flltl,

UBALD HEBERT, F MANCHESTER, N'EVV HAMPSHIRE, ASSIGNOR T0 DRAPER COMPANY, OF HOPEDALE, MASSACHUSETTS, A CQRPQRATION 0F MAINE.

FILLING-REPLENISHING MECHANISM FOR LOOMS.

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Specification of Letters Patent.

Patented May so, rare.

Application filed January 21, 1916 Serial No. 73,450.

zen of the United States, residing at Manchester, county of Hillsboro, State of New Hampshire, have invented an Improvement in Filling- Replenishing Mechanism for Looms, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to automatic filling replenishing mechanism for looms ,of the Northrop type in which the supply of fresh filling carriers or bobbins is maintained in a rotary battery, feeder or hopper from which upon thecall for filling replenishment they are successively transferred to the running shuttle.

More particularly the invention relates to filling replenishing looms of thistype in which a definite relation of the filling carrier rotarily of its longitudinal axis with respect to the shuttle walls is requisite, because of the use offilling carriers'or bobbins of the general character illustrated in the patents to William Parker Straw No. 908,748, granted December 5, 1908, No. l,053,67 3, granted February 18,1913, and No. 1,092,959 granted April 1-4, 1914.- I

The general type of filling mechanism is well known and-familiar and reference may be had to the Patent to E. S. Stimpson No. 664,790 granted December 25, 1900 as an illustration. ofone form thereof. When, however, filling carriers are employed of the character disclosed in the aforesaid patents to Straw, it is desirable that the seats for the to be replenished.

butts of the filling carriers located inthe periphery of the disk of the hopper instead of being radial as illustrated in the aforesaid patent to Stimpson shall be inclined to the radii of the hopper in order to assist in guiding the filling carriers during transfer to the shuttle on the lay which is beating up as transfer begins and to insure the proper positioning of the filling carrier in the shuttle In these types of filling replenishing mechanism the bobbin to be transferred is brought by the feeding movement of the hopper into contact with a relatively fixed guiding abutment and during transfer the bobbin is or should be in contact with this abutment in order to direct it properly into the shuttle. The object of the abutment is thus to maintain the bobbin during transfer in the desired path or line of transfer, but the invention in its broader aspect is not to be limited to the use of such a guiding abutment. When the peripheral seats in the hopper are inclined to the radii the hopper must have a rotary movement until the bobbin has passed out from the seat in order to maintain the bobbin in guiding contact with the abutment and the hopper must preferably then be locked against further rotary movement until a predetermined reverse movement of the transfer means has taken place sufficient to prevent vInalposition of the parts such for example as the next succeeding bobbin in the hopper coming into engagement with the transfer means. If this rotary movement of the hop per to maintain the bobbin to be transferred in guiding contact with the abutment during transfer does not take place the bobbin may ride up on the usual pivoted bobbin support located opposite to the abutment or the bobbin may be mispositioned it. or fail to enter the shuttle, thus preventing replenishment taking place and even causing a smash.

It is the object of the present invention to provide means acting to give the required rotary movement of the hopper to maintain the bobbin being transferred in contact with the abutment until the bobbin passes entirely out from its seat in the hopper and also preferably thereupon to lock the hopper against further rotation until such a reverse movement of the transfer means has taken place as to prevent any improper operation or positioning of the mechanism. These and other objects of the invention will appear I nism embodying the invention embodied therein.

' In the drawings, Figure 1 1s an end elevatlon partlally in transverse section of a suffici'ent portion of the loom necessary to a disvention; Fig. 4is a view in vertical cross section taken on the line 1-l, Fig. 1.

The general construction of the type of loom illustrated being well known and familiar needs no extended description. It includes the rotatable battery feeder or hopper comprising parallel disks between which the filling carriers such as bobbins are mounted in a circular series. But one of these disks, namely, the disk 1 provided with seats, 2 for the butts of the bobbins is illustrated. The hopper is rotatably mounted on the fixed stud 3 rigidly secured to the hopper stand 4 which is itself secured to the loom frame at one side of the loom. A circular flange 5 on the hopper stand surrounds the disk 1 to protect the heads of. the

bobbins and to retain them in place until they reach substantially their operative position, the flange terminating at the points 6 and 7.

The filling carriers or. bobbins 8 illustrated are of the type disclosed in the aforesaid patents to Straw in which the barrel of the bobbin is provided with a transverse slot or opening to cooperate with a feeler whereby absence or exhaustion of the filling in the running shuttle is indicated. This requires that the bobbin when placed in the shuttle shall occupy a definite relation rotarily of its longitudinal-axis. with respect to the walls of the shuttle. For this purpose the butt of the bobbin is provided with a, pair of parallel positioning faces 9 which determine the position of the bobbinin the shuttle. The seats'2 in the disk-1 of the hopper are accordingly formed with parallel walls and of such width as to fit the butts of the bobbins, and thusretain the bobbins in fixed relation in the hopper.

When transfer of the bobbin from the hopper beginsthe shuttle which is to re-.

ceive the bobbin is on the lay beneath the hopper and the lay-is concluding its beat up toward-the left, viewing Fig. 1, and hence in order that the bobbin may more surely enter the bobbin holding or gripping devices in the shuttle in correct position it has been found desirable toposition the seats 2 in a'direction inclined to the radii of the hopper as indicated in the drawing.

'The hopper stand 4 is provided with a relatively fixed abutment 10 against which the bobbin to be transferred is brought by the rotation of the hopper and during transfer from the hopper the bobbin is guided against this abutment to direct it into the shuttle beneath. The flange 5 terminates at the point 7 a considerable distance from the abutment 10 but is effectively prolonged by the bobbin support 11 pivoted on the hopper stand at 12. This bobbin support serves to retain thebobbins nearest the abutment in their seats in the hopper and yields upon the passage of the bobbin to be transferred to permit its discharge from the hopper.

The mechanism for effecting transfer of the bobbins is illustrated as of a well known type comprising the transferrer l3 pivoted on a horizontal stud 14 carried by the hopper stand 4:, and provided with a depending arm 15 through which it is actuated upon the call for filling replenishment. The transferrer is normally elevated through the action of the usual spring 16 and is depressed to effect the transfer movement through the usual connections of the depending arm 15. At its free end the transferrer is provided with a downturned portion 17 to engage the bobbin and discharge it from its seat in the hopper disks.

The hopper is rotated to bring a fresh bobbin into position for transfer by suitable mechanism and in the type illustrated this rotation is secured by a dog 18 pivoted at 19 to the transferrer and provided with a tooth 2O cooperating with the teeth of a ratchet wheel 21 integral or moving synchronously with the hopper. Upon the reverse movement of the transferrer the tooth 20 engaging the ratchet wheel 21 rotates the hopper to bring the leading bobbin of the series in the hopper into contact with the abutment l0 and thus into position for transfer.

With the bobbin butt seats 2 inclined it follows that as the bobbin during transfer moves out of its seat it will move away from the abutment 10 and unless the rotation of the hopper is continued to maintain the bobbin in contact with the abutment until after it leaves its seat the bobbin may ride up on the pivoted bobbin support 11 and thus transfer fail to be effected and a smash caused. The hopper is usually free to rotate but it cannot be depended upon to rotate to secure the proper operation of the parts. Consequently this invention provides a means for securing the rotation of the hopper to maintain the bobbin in contact with the abutment 10 during transfer or until after the bobbin leaves its seat.

Filling replenishing mechanism of the type here involved is usually provided with a detent pawl 22. This pawl is provided with a tooth 23 engaging the ratchet wheel 21, and its usual purpose is to prevent reverse rotation of the hopper. The present invention may, and in the preferred form illustrated does, make use of this detent pawl as one of the elements of the mechanism involved in securing the necessary rotation of the hopper during transfer. For this purpose in the construction illustrated a pawl support 24 is pivoted on a stud 25 projecting from the hopper stand and extends rearwardly past the pivot 14 of the transferrer. The detent pawl 22 is provided with a stud 26 by which it is pivotally mounted'midway the length of the pawl support 24. Hence upon the movement of the pawl support, 24 the detent pawl 22 is given a bodily movement while it has in addition its usual pivotal movement upon the stud 26. In order to operate the pawl support the transferrer 13, in the construction illustrated, presents rearwardly of its pivot 14 an arm 27 extending beneath the rearward end of the pawl support. Preferably also a yielding connection is provided between the arm 27 and the rearward end of the pawl support 24. For this purpose the end of the pawl support is given a cam shaped recess 28 and the arm 27 is provided with a plunger 29 cooperating with said recess 28, and yieldingly held by the spring 30 in a socket in the arm 27. When now the transferrer 13 in the operation of transfer is moved downwardly into contact with the bobbin to be transferred the arm 27 is elevated and through the yielding plunger 29 and in cooperation with the cam shaped recess 28 swings the pawl support 24 upwardly about its pivot 25, and by a sort of toggle action bodily moves the detent pawl 22 upwardly thus through the medium of the ratchet wheel 21 rotating the hopper and maintaining the bobbin being transferred in contact with the guiding abutment 10, the spring 30' yielding as required to prevent binding of the parts.

In order that the movement of the rotation thus embodied to the hopper may not be excessive or more than required to effect the desired result, a condition which if permitted would bring the next succeeding bobbin in the hopper into contact with the transferrer and thus prevent improper positioning of the parts, it is desirable that the hoppcr should be locked against further rotation until such a reverse movement of the transferrer has taken place as to prevent any improper operation or positioning of the mechanism. In the construction illustrated in Figs. 1, 2 and 4 this result is secured by means of a brake engagingfrictionally the periphery of the hopper. For this purpose the pawl support 24 is provided with a brake arm 31 so positioned that when the bobbin has passed entirely out from its seat in the operation of the transfer this brake arm 31 is brought by the movement of the pawl support into frictional engagement with the periphery of the hopper disk 1 thus locking ferrer arm the spring 30 yields. This brake arm is held in engagement with the hopper disk until the transferrer arm rises to such a position in its reverse movement thatthere is no danger of an improper positioning of the parts.

It is also desirable that positive means shallbe provided for unlocking the hopper and freeing it to rotation when the necessity for braking action has ended. In the construction illustrated this is secured by pro viding an upward extension 32 on the transferrer in front of the hub 33 of the pawl support 24 in which the stud 26 is pivoted. This extension is so formed and located that as the transferrer rises in its reverse movement to a position where the braking action may be released it comes in contact with the hub 33, and thus swings the pawl support rearwardly releasing the brake arm 31 from the periphery of the hopper, and thus unlocking the hopper and freeing it to rotation.

The operation of mechanism illustrated in Figs. 1, 2 and 4 will now be apparent. Through the usual upward or reverse movement of the transferrer 13 and the engagement of the tooth 20 of the dog 18 carried thereby with the ratchet wheel 21 the parts have been brought into the position illustrated in Fig. 1 with a bobbin resting against the guiding abutment 10 and upon the tip of the pivoted bobbin support 11 ready for transfer. The detent pawl 22 at this time is held in engagement with the ratchet wheel 21. Upon the call for filling replenishment the arm 15 of the transferrer is pushed rearwardly causing the transferrer to descend and contact with the bobbin therebeneath. This at the same time elevates the arm 27 and causes the pawl support 24 to swing upwardly carrying bodily with it the detent pawl 22 which thereupon as the transferrer continues its downward movement acts to rotate the hopper and maintain the bobbin in contact with the guiding abutment. When the bobbin depressing the bobbin support 11 has entirely freed itself from its seat the friction brake 31 coming into contact with the periphery of the hopper locks it against further rotation and the further descent of the transferrer acting against the spring 30 causes no further movement of the detent pawl. Upon the reverse movement of the transferrer under control of its spring 16 when it has reached a position where there is no danger of the next succeeding bobbin coming into contact with it or the parts being otherwise mispositioned the extension 32 comes against the hub 33 of the pawl support and swings the pawl support 24 rearwardly releasing the brake 31 from the hopper disk and thus enabling the transferrer on completion of its upward or reverse movement acting through the dog 18 again to rotate the hopper to insure the presence of the next bobbin in position for transfer. Thus the bobbin being transferred is carried positively and accurately downward in contact with the guiding abutment 10 out of its seat and in proper position to enter the shuttle beneath on the lay to be replenished.

The construction illustrated in Fig. 3 is the same in all respects as that already described except that a different means is illustrated, as an embodiment of the invention for locking the hopper against undesired or further rotation until the predetermined reverse movement of the transferrer has taken place. In the construction illustrated in Fig. 3 a means is employed for entering a recess such as the space between the teeth of the ratchet wheel 21 and thus positively locking the hopper against further. rotation at the requiredtirne. As an example of such means the pawl support 24 has projecting-forwardly from its hub 33 a locking arm 34 so shaped and positioned that when the transferrer in its downward movement of transfer has cleared thebobbin from its seat in'the hopper the end of this locking 7 arm-will enter a space between two of the teeth inthe ratchet wheel 21, and thus lock the hopper against further rotation. Upon the reverse movement of the transferrer' to the required extent the extension 32 will as before contacting with the hub 33 swing the pawl support 21 rearwardly and thus withdraw the locking arm 34 from engagement with the teeth of the ratchet wheel 21 again leaving the hopper free to rotate. Having fully described, my invention, what I claim as new and desire to secure by Letters Patent is:

1-. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, and means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from itsseat.

2.-An automatic weft replenishing loom comprising a rotaryhopper provided with peripheral bobbin seats inclined to the radii of the'hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle,- means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat. and means acting thereupon to lock the hopper against further rotation until a predeterm-ined reverse movement of the transfer means has taken place.

3. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, an abutment to guide the bobbins in their disclmrge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat, and a friction brake acting thereupon to engage the hopper periphery and lock the hopper against further rotation until a predetermined reverse movement of the transferrer means has taken place.

4. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat, and a friction brake controlled by said last mentioned means acting thereupon to engage the hopper periphery and lock the hopper against further rotation until a predetermined reverse movement of the transfer means has taken place.

5. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat, and locking means controlled by said last mentioned means acting thereupon to lock the hopper against further rotation until a predetermined reverse movement of the transfer means has taken place.

6. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, means to transfer the bobbins successively from the'hopper to the running shuttle, and means acting to rotate the hopper to maintain the bobbin being transferred in the path of transfer until the bobbin passes from its seat.

7. An automatic weft replenishing loom comprising a rotary hopper provided with of the hopper, means to transfer the bobbins successively from the hopper to the running shuttle, means actingto rotate the hopper to maintain the bobbin being transferred in the path of transfer until the bobbin passes from its seat, and means acting thereupon to lock the hopper against further rotation until a predetermined reverse movement of thetransfer means has taken place.

8. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the :hopper, means to transfer the bobbins successively from the hopper to the running shuttle, means acting .to rotate the hopper to maintainthe bobbin being transferred in the path of transfer until the bobbin passes from its seat, and a friction brake acting thereupon'to engage the hopper peripherally and lock the hopper against further rotation until apredetermined reverse movement of the transfer means has taken place.

9. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, means to transfer the bobbins successively from the hopper to the .running shuttle, means acting to rotate the hopper to maintain the bobbin being transferred in the path, of transfer until the bobbin passes from its seat, and a friction brake controlled by said last .mentioned means acting thereupon to engage the hopper periphery and lock the hopper against further rotation until a predetermined reverse movement of the transfer means has taken place.

10. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, means'to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper to maintain the bobbin being transferred 1n the path of transfer until the I bobbin passes from its seat, and locking means controlled by said last mentioned means acting thereupon to lock the hopper against further rotation until a predetermined reverse movement of the transfer means has taken place.

11. An automatic Weft replenishing loom comprising a hopper stand, a hopper rotarily mounted therein and providedwith peripheral bobbin seats inclined to the radii of the hopper, a ratchet wheel connected to and rotating with the-hopper, a transferrer pivotally mounted on the stand, a pawl support pivotally mounted on the stand, a detent pawl pivotally mounted on the pawl support and cotiperating with the ratchet wheel, a yielding connection between the transferrer and pawl support whereby upon transfer movement of the transferrer the pawl support is rocked to give a bodily movement to the detent pawl rily mounted therein and provided with peripheral bobbin seats inclined to the radii of the hopper, a ratchet Wheel connected to and rotating with the hopper, a transferrer pivotally mounted on the stand, a pawl support pivotally mounted on the stand, a detent pawl pivotally mounted on the pawl support and cooperating with the ratchet wheel, a yielding connection between the transferrer and pawl support whereby upon transfer movement of the transferrer the pawl support is rocked to give a bodily movement to the detent pawl and therethrough to rotate the hopper to maintain the bobbin during transfer in its required path of transfer, and means operated by the pawl support to lock the hopper against further rotation until a predetermined reverse movement of the transferrer has taken place.

13. An automatic Weft replenishing loom comprising a hopper stand, a hopper rotarily mounted therein and provided with peripheral bobbin seats inclined to the radii of the hopper, a ratchet wheel connected to and rotating with the hopper, a transferrer pivotally mounted on the stand, a pawl support pivotally mounted on the stand, a detent pawl pivotally mounted on the pawl support and cooperating with the ratchet wheel, a yielding connection between the transferrer and pawl support whereby upon transfer movement of the transferrer the pawl support is rocked to give a bodily movement to the detent pawl and therethrough to rotate the hopper to maintain the bobbin during transfer in its required path of transfer, and a friction brake carriedby the pawl support and thereupon brought into engagement with the hopper periphery to lock the hopper against further rotation until a predetermined reverse movement of the transferrer has taken place.

'14. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, means to transfer the bobbins successively from the hopper to the running shuttle, and means yieldingly operated by said transfer means acting to rotate the hopper to maintain the bobbin being transferred in its required path of transfer until the bobbin passes from its seat.

15. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, a ratchet wheel rotatable with the hopper, a movably mounted transferrer, and means for actuating it to cause lua it to transferthe bobbins successively from thehopper to the running shuttle, a movably quired path of transfer until the bobbin passes'from its seat.

16. An automatic weft replenishing loom comprising a hopper stand, a hopper rotarily mounted therein and provided with peripheral bobbin seats inclined to the radii of the hopper, a ratchet wheel connected to and rotating with the hopper, a transferrer pivotally mounted on the stand, a pawl support pivotally mounted on the stand, a detent pawl pivotally mounted on the pawl support and cooperating with the ratchet wheel, a yielding connection between the transferrer and pawl support whereby upon transfer movement of the transferrer the pawl support is rocked to give a bodily movement to the detent pawl and therethrough to rotate the hopper to maintain the bobbin during transfer in its required path of transfer, means operated by the pawl support to lock the hopper against further rotation, and means operated by the transferrer to unlock the hopper when a predetermined reverse movement of the transferrer has taken place. r.

17. An automatic weft replenishing loom comprising a hopper stand, a hopper rotarily mounted therein and provided with peripheral bobbin seats inclined tothe radii of the hopper,'a ratchetwheel connected to and rotating with the hopper, a transferrer pivotally mounted on the stand, a pawl support pivotally mounted on the stand, a de- 3 tent pawl pivotally mounted on the pawl support and cooperating with the ratchet wheel, a yielding connection between the transferrer and pawl support whereby upon transfer movement of the transferrer the pawl support is rocked to give a bodily movement to the detent' pawl and therethrough torotate the hopper to maintain the bobbiniduring transfer in its required path of transfer, a friction brake carried by the pawl support and thereupon brought into engagement with the hopper periphery to lock the hopper against further rotation, and an extension of the transferrer acting to contact with the pawl support when a predetermined reverse -'movement of the transferrer has taken place and therethrough release the friction brake.

- 18. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat, means acting thereupon to lock the hopper against further rotation, and means acting to unlock the hopper when a predetermined reverse movement of the transfer means has taken place.

19. An automatic weft replenishing loom comprising a rotary hopper provided with peri heral bobbin seats inclined to the radii of t e hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat, a friction brake acting thereupon to engage the hopper-periphery and lock the hopper against further rotation, and means acting to release the friction brake when a predetermined reverse movement of the transferrer means has taken place.

20. An automatic weft replenishin loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, an abutment to guide the bobbins in their discharge from the hopper seats during transfer, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper and maintain the bobbin being transferred in contact with the abutment until the bobbin passes from its seat, a friction brake controlled by said last mentioned means acting thereupon to engage the hopper periphery and lock the hopper against further rotation, and means controlled by the bobbin transferring means acting to release the friction brake when a predetermined reverse movement of the transfer means has taken place.

21. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper to maintain the bobbin being transferred in the path of transfer until the bobbin passes from its seat, means acting thereupon to lockthe hopper against further rotation, and means acting to unlock the hopper when a predetermined reverse movement of the transfer means has taken place.

22. An automatic weft replenishing loom comprising a rotary hopper provided with peripheral bobbin seats inclined to the radii of the hopper, means to transfer the bobbins successively from the hopper to the running shuttle, means acting to rotate the hopper to maintain the bobbin being transferred in the path of transfer until the bobbin passes from its seat, a friction brake controlled by 5 said last mentioned means acting thereupon to engage the hopper periphery and lock the hopper against further rotation, and means controlled by the bobbin transferring means acting to unlock the hopper when a predetermined reverse movement of the transfer 10 means has taken place.

In testimony whereof, I have signed my name to this specification.

UBALD HEBERT.

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