US1960605A - Rewinding apparatus - Google Patents

Description

May 29, 1934. I ITE 1,960,605

REWINDING APPARATUS Filed July 29. 1933 INVENTOR 5% MW wu ATTORNEYS Patented May 29, I934 entree OFKiE REVVINDING APPARATUS Application July 29, 1933, Serial No. 682,746

8 Claims.

This invention relates to rewinding apparatus, and more particularly to core shafts.

While the invention is adapted to apparatus for winding any kind of web on any type of machine, it will be described illustratively with particular reference to a toilet paper rewinder in which the broad web from a parent roll is slit, perforated, and wound upon a series of cores carried by a demountable core shaft.

It is the primary object of the present invention to provide a core shaft of such a design that anti-friction means used to facilitate the withdrawal of the cores from the core shaft may operate to transmit rotative motion from 15 the shaft to the cores for the winding of the web thereon in the power rotation of the shaft.

Various mechanical devices have been used to clutch or engage the individual cores to the shaft for winding purposes. In many of these the mechanism has been complex in order that the core engaging device might be retracted for the withdrawal of the core from the shaft. In other devices the core engaging means does not satisfactorily release the core for withdrawal.

By means of the present invention the rollers which facilitate the withdrawal of the cores from the core shaft in an axial direction are designed to provide an effective motion transmitting connection between the shaft and the cores for non-slipping motion transmission in a circumferential direction.

The drawing is diagrammatic.

Figure 1 shows a diagrammatic side elevation of paper conversion apparatus employed in the rewinding of toilet rolls.

Figure 2 is a fragmentary diagrammatic plan showing the driving connection to one end of a core shaft.

Figure 3 and Figure 4 are details in cross sec! tion of different core shaft embodiments of the invention.

Like parts are identified by the same reference characters throughout the several views.

The toilet rewinder mechanism in general is well known to the art and will be very briefly described. From the parent roll 5 the web 6 passes over cylinder '7, being held thereto for the slitting and perforating operations by the pull rolls 8. A motor 9 drives a cylinder '7 and pulley 10 from which, through belt 11, pulley 12, and

clutch 13, the core shaft is driven.

The core shaft may be polygonal in cross section as shown in Fig. 3, or may be round in cross section as shown in Fig. 4. In order to avoid the weight of a transversely slotted solid shaft, it is preferred that the core shaft be made of hollow tubular stock slotted at 16 to permit the wheels 18 to project therefrom. These wheels are mounted to rotate freely on cross pins 19 slightly offset from the axis of the r'haft in order that the wheel may project at one side beyond the perimeter of the shaft.

The surfaces of wheels 18 are preferably cylindrical, and meet the end faces of the wheels with sharp marginal edges calculated to bite into the material of the tubular core to transmit rotative motion thereto during the rewinding operation. When the rewinding operation is complete, the squared end of the core shaft 15 will be withdrawn from its socket in the driving clutch mechanism and the cores carrying completed rolls will be stripped from the core shaft in the usual manner. During this stripping operation, insofar as the wheels engage the cores at all, they will yield in the direction of core movement axially of the shaft and will offer practically no resistance to core withdrawals.

It is broadly immaterial whether the wheels or rollers be aligned, all at one side of the shaft, as is done in the case of alternate wheels in the shaft shown in Fig. 2, or whether the wheels be set at different positions to project on different sides of the shaft. The shaft itself offers little resistance to core withdrawals, and the function of the wheel is simply to provide 5 a core engaging means which will act positively upon the core in a winding direction but will offer no resistance whatever to core movement in an axial direction, even if the wheel or roller happens to be engaged or embedded in the core 9.0 at the time the core shaft is taken from the machine preparatory to the discharge of cores and rolls therefrom.

I claim:

1. Winding apparatus comprising the combination with driving means, of a power driven shaft adapted to receive cores and provided in its periphery with a core engaging device, the exposed portions of which are freely yieldable in a direction axially of the core shaft, and substantially unyieldable circumferentially of said shaft, whereby to be effective for the transmission of rotative motion from the shaft to a core thereon in a winding direction.

2. Winding apparatus comprising the combination with a source of power, of a core shaft operatively connected to be driven from said source and provided with a wheel having an axle disposed transversely of said shaft, its marginal edges being sharp for the transmission of rotative motion to a core upon said shaft and freely yieldable axially of said shaft to facilitate core withdrawal therefrom.

3. The combination with a driving connection, of a driven core shaft, a series of pins disposed transversely of the axis of said shaft and offset therefrom, and a series of Wheels rotatively carried by said pins to project from said shaft for marginal engagement with the interior of a core mounted thereon, said wheels being adapted to transmit rotative movement to the cores upon said shaft while turning freely in a direction axially of the shaft to facilitate core withdrawals.

4. As a new article of manufacture, a core shaft provided with a power receiving portion and adapted to receive a yieldable core, a pin disposed transversely of said shaft and offset from the axis thereof, and a marginally sharp wheel rotatably carried by said pin, the outer most portions of said wheel being freely movable in a direction axially of the shaft to facilitate core Withdrawal therefrom, and substantially non-yieldable in a direction peripherally of the shaft whereby to transmit motion to a core thereon.

5. As a new article of manufacture, a slotted core shaft, a pin spanning the slot transversely of the core shaft, a wheel carried by said pin within said slot and having a sharpened margin projecting from said shaft in a position to engage a core thereon, said Wheel providing a pos itive driving connection from said shaitto said core in a rotative direction while facilitating the frictionless Withdrawal of said core from said shaft in an axial direction.

6. A Winding machine comprising in combination driving connections, a core shaft driven from said connections and provided at intervals of its length with slots, pins disposed transversely of said slots and offset from the axis of said shaft, and Wheels with sharp margins rotatively carried by said pins and projecting beyond the periphery of said shaft to engage cores thereon, certain of said wheels having their peripheral projecting portions substantially aligned at one side of said shaft.

7. A winding machine comprising in combination driving connections, a core shaft driven from said connections and provided at intervals of its length with slots, pins disposed ransversely of said slots and offset from the axis of said shaft, and wheels with sharp margins rotatively carried by said pins and projecting beyond the periphery of said shaft to engage cores thereon, certain of said Wheels being angularly offset from each other about the periphery of said shaft to project at different sides thereof.

8. As a new article of manufacture, core shaft of polygonal cross section, a transverse pin carried by said shaft, and a roller mounted on said pin to project peripherally from shaft to facilitate the axial movement of a core thereon while affording a positive motion transmitting connection from said shaft to such core in the rotation of said shaft.

JOHN P. VANITEN.

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