US3539128A

US3539128A - Detachable mandrel shaft for winders and unwinders

Info

Publication number: US3539128A
Application number: US755549A
Authority: US
Inventors: Louis Jean Chambon
Original assignee: Mach Speciales SA Soc D Et
Current assignee: D'etudes De Machines Speciales Sa soc; Mach Speciales SA Soc D Et
Priority date: 1967-09-01
Filing date: 1968-08-27
Publication date: 1970-11-10
Anticipated expiration: 1987-11-10
Also published as: NL6812383A; SE340735B; LU56738A1; DK117810B; FR1547550A; DE1774722B1; GB1184405A; BE719731A

Description

Inventor Louis Jean Chambon Paris, France Appl. No. 755,549 Filed Aug. 27, 1968 Patented Nov. 10, 1970 Assignee Societe DEtudes De Machines Speciales,

Societe Anonyme Paris, France Priority Sept. 1, 1967 France 119,715

DETACHABLE MANDREL SHAFT FOR WTNDERS AND UNWINDERS 3 Claims, 3 Drawing Figs.

US. Cl... 242/72.l

Int. Cl B65h 75/24 Field of Search 242/72.l

mmsm

References Cited UNITED STATES PATENTS 559,682 5/1896 Coultas r. 242/72.l 1,138,079 5/1915 Cameron et al. 242/72.l 2,266,408 12/1941 Bruestle 242/72.l 2,291,863 8/1942 Baker 242/72.l 3,201,058 8/1965 Waldherr et a1. 242/72.l

Primary Examiner-Nathan L. Mintz Attorneyj- Robert E. Burns and Emmanuel .1. Lobato ABSTRACT: A mandrel comprising a hollow cylindrical body formed with opening in which locking jaws are adapted to slide radially for locking engagement with the inner cylindrical wall of the mandrel, the movements of said jaws being controlled in the locking direction by a control rod mounted for rotation but held against axial movement in said hollow cylindrical body and provided with end means for causing this rotation, another hollow cylindrical member adapted to slide axially in said body being provided with frustoconical outer surface means adapted to engage the inner surface of said locking jaws and also with splined end portions adapted in their outer position to act as trunnions to said shaft assembly, spring rings constantly urging said jaws towards the shaft axis.

Patented 10, 1970 #5 EM: m mfi 2 3 in m ww 25 5 :QN i m llll'lll m AN .mw m Q32 0 DETACHABLE MANDREL SHAFT FOR'WINDERS AND UNWINDERS BACKGROUND OF THE INVENTION The present invention relates to a detachable mandrel-supporting shaft for winding and unwinding devices and has specific reference to a shaft adapted to be releasably con nected to a mandrel on which a spool of a web material, for

example a paper web, is formed or to be formed.

Apparatus for winding and unwinding a web material are already known. In these apparatus the axial or central mandrel, on which the spool of web material is to be formed, must necessarily be adapted to be rotatably mounted on a suitable support during the winding or unwinding operation.

SUMMARY OF THE INVENTION This invention is concerned with a mandrel shaft designed more specially for carrying out these operations.

The invention has primarily for its object to provide a detachable mandrel-supporting shaft for winding and unwinding devices, which is adapted to be engaged in a hollow central mandrel-on which the spool of web material is formed or to be formed, and which permits to simultaneously release the shaft from the mandrel and the shaft from its supporting bearings in a single operation. I

To this end, the detachable mandrel-supporting shaft according to the invention comprises therein end trunnion members solid with wedge-shaped members in order to cause jaws to emerge or be retracted with respect to the outer peripheral surface of the shaft, and concurrently causing said end trunnion members to slide between an inward or retracted position within said shaft and an outward position in which said end trunnion members are used to rotatably support the shaft.

The axial sliding movement of said pair of wedge-shaped members and of said end members rigid therewith is obtained by providing a coaxial control rod rotatably mounted within the shaft body and extending throughout the shaft length, said rod comprising two screw-threaded portions having opposite pitches and a pair of nuts engaging said screw-threaded portions, respectively, and each rigid with one of said wedgeshaped members, respectively.

The aforesaid central control rod comprises at either end a head adapted to be rotatably driven by means of a suitable tool whereby a rotation of said rod in one direction is attended by the outward movement of said locking jaws and of said end members, and in the opposite direction by the inward movement of said jaws end members. It is clear that under these conditions the operations consisting in locking and releasing the mandrel-supporting shaft in said mandrel are particularly easy to accomplish.

BRIEF DESCRIPTION OF THE DRAWING A typical form of embodiment of this invention will now be described by way of example with reference to the accompanying drawing in which:

FIG. I is an axial fragmentary section showing one-halfof a mandrel-supporting shaft according to this invention, the locking jaws and the end members being shown in their outermost positions;

FIG. 2 is an axial section similar to FIG. 1 but showing the locking jaws and the end members in their innermost or retracted positions and,

FIG. 3 is a cross section taken along the line III-III of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT The mandrel-supporting shaft of which only the left-hand i.e. the portion extending on the left-hand side of its transverse median plane x-y is shown in the drawing comprises essentially a hollow body 1 consisting of a plurality of assembled sections, Le. a central sleeve 2, an intermediate cylinder 3 and an end sleeve 4. These

elements

2, 3 and 4 are assembled by mutual engagement of screw-threaded

portions

5 and 6.

Formed in the intermediate cylinder 3 are longitudinal openings or slots 7 disposed at spaced angular intervals about the shaft axisyalthough the form of embodiment illustrated comprises three openings'7, this number should not be construed as limiting the invention; each opening or slot 7 has slidably mounted for radial movement therein a locking jaw 8 of substantially parallelipipedic configuration having its outer surface formed with longitudinal ribs or like projections 9 adapted, when it is desired to lock the shaft in relation to the mandrel, to engage with force the inner surface of the hollow mandrel 1 1, for example a cardboard mandrel shown only diagrammatically in dash-and-dot lines.

These three locking jaws 8 are constantly urged for engagement by their inner faces against an inner axial sliding member 12 by annular spring rings 13 fitted in grooves 14 formed in the locking jaws 8. v

The longitudinal sliding member 12 controlling the outward and inward movements of the locking jaws 8 consists of a hollow, substantially cylindrical member having its outer surface formed with two axially spaced frustoconical or

tapered portions

12a and 12b acting as wedges. These

frustoconical portions

12a and 12b are adapted to co-act with portions 8a and 8b, having the same angular inclination, formed on the inner surface of the aforesaid locking jaws 8.

The sliding member 12 is provided, at its end registering throughout the shaft length. This screw rod rotatably mounted in a bearing-not shown-housed in the central sleeve 2 is held against axialmovement by a suitable thrust bearing 22.

On the other side of said median transverse plane x-y the rod 21 comprises another screw-threaded portion of a pitch opposite to that of portion 19, this other threaded portion receiving a nut rigid with the other sliding member disposed symmetrically in relation to sliding member 12.

At its outer end the control rod 21 carries a square head 23 permitting its operation by means of a suitable tool or spanner.

On the other hand, the central sliding member 12 is completed at its outer end by an'end member 24 formed with an outer splines 25.

When the mandrel-supporting shaft is locked in the hollow mandrel 11 the various component elements of this shaft are positioned as shown irkFlG. 1. In this case, it will be seen that the sliding member 12 is in its outermost or left-hand position within the body portion 1 of the shaft, with the splined end member 24 projecting therefrom so that it can be trunnioned in a bearing-mot shownbesides, the locking jaws 8 are forced outwards against the resistance of spring rings 13 by the frustoconical wedge-

shaped portions

12a and 12b of sliding member 12. Therefore, the ribs or like projections 9 of the locking jaws 8 are impressed into the material constituting the mandrel 11, and this mandrel 11 is thus rigidly connected to the shaft 1.

When it is desired to release the mandrel 11 from its shaft 1, it is only necessary to rotate the central control rod 21 in the proper direction by means of a suitable tool or spanner-not shown-engaging the square head 23. The rotation of rod 21 is attended by the rotation of screw 19, so that the nut-forming sleeve 15 engaging this screw moves to the right as seen in FIG. 1 while it is locked against rotation as a consequence of the mutual engagement of splines 16 in the splines 18 of the fixed sleeve 17. As a result, the sliding member 12 is caused to perform a movement of translation to the right whereby, due to the movement of the

frustoconical portions

12a and 12b in the same direction, the locking jaws 8 are released and moved inwards of the shaft body 1 by the action of return springs 13.

At the end of this rotation of rod 21 the jaws 8 are retracted completely within their openings 7 as shown in FIG. 2. At this time the shaft 1 is released from the mandrel 11 and can therefore be extracted therefrom.

It will also be seen in FIG. 2 that the movement of translation to the right of sliding member 12 is concurrently attended by the inward movement of the splined end member 24 in the shaft body 1, so that this shaft body is also released from its supporting bearings-not shown.

I claim:

1. A detachable mandrel-supporting shaft for supporting a hollow mandrel on which a spool of web material is formed or to be formed comprising: a hollow cylindrical body, means defining openings in a wall of said hollow cylindrical body, locking jaws mounted for radial movement in said openings, first and second wedge-shaped members disposed symmetrically in relation to a median transverse plane of said shaft resilient means constantly urging said jaws against said wedgeshaped members, means mounting said first and second wedge-shaped members for axial movement interiorly of said body and in sliding contact with respective ones of said locking jaws, first and second end trunnion members rigid with respective ones of said first and second wedge-shaped members and movable therewith. and means for effecting alternate axial movement of said first and second wedge-shaped members to thereby effect radial movement of said jaws alternately outwardly and inwardly with respect to the outer peripheral surface of said hollow body concurrently with axial sliding movement of said first and second end trunnion members from a retracted position within said shaft to a projecting position in which said first and second end trunnion members are effective to rotatably support the shaft.

2. A shaft as set forth in claim 1, which comprises a coaxial control rod rotatably mounted in said shaft body and extending throughout the length of said shaft, first and second threader portions having opposite pitches which are formed on said rod, and first and second nuts respectively solid with said first and second wedge-shaped members and engaging said first and second threaded portions.

3. A shaft as set forth in claim 2, which comprises at either end of said central control rod a head shaped to permit its engagement by a member for rotating same.