US3018977A

US3018977A - Driving mandrel for rolls of paper in printing and similar machines

Info

Publication number: US3018977A
Application number: US835729A
Authority: US
Inventors: Skallquist Karl Sture Alvar
Original assignee: Dagens Nyheters AB
Current assignee: Dagens Nyheters AB
Priority date: 1958-08-27
Filing date: 1959-08-24
Publication date: 1962-01-30
Anticipated expiration: 1979-01-30
Also published as: GB905834A

Description

Jan. 30, 1962 K. s. A. SKALLQUIST 3,013,977

DRIVING MANDREL FOR ROLLS OF PAPER IN PRINTING AND SIMILAR MACHINES Filed Aug. 24, 1959 2 Sheets-Sheet 1 I I 2 8 /V 41 Mg ,0 y'- d II/ "-2 Jan. 30, 1962 K. s. A. SKAL UIST 3,018,977 DRIVING MAND FOR ROLLS P P R IN PRINTING SIMILAR MACHI Filed Aug. 24, 1959 2 Sheets-Sheet 2 ite States 3,018,977 DRIVING MANDREL FOR ROLLS OF PAPER IN PRINTING AND SIMILAR MACHINES Karl Sture Alvar Skallquist, Alvsjo, Sweden, assignor to Dagens Nyheters Aktiebolag, Stockholm, Sweden, a

corporation of Sweden Filed Aug. 24, 1959, Ser. No. 835,729 Claims priority, application Sweden Aug. 27, 1958 3 Claims. (Cl. 242-72) ,fore the automatic connection of the mandrel to the roll should be such that it can prevent relative rotation in either sense between the roll and the mandrel.

A paper printing machine according to this invention comprises a spindle adapted to receive a roll of material and to be driven by a power source; gripping members movably mounted on the spindle and adapted to be moved into firm engagement with the roll to connect the roll to the spindle upon movement of the spindle relatively to the roll caused by inertia of the roll upon starting to rotate; a locking device movable in relation to the spindle and adapted to retainthe gripping members in a certain position relative to the spindle; and a ratchet means by which said locking device is connected to said spindle and which is such as to permit relative movement between the locking device and spindle in a direction to permit the gripping members to move into firm engagement with the roll but which prevents such relative movement in the opposite direction.

Thus mere mounting of the roll upon the spindle will, when the spindle starts to rotate, result in connection of the roll to the spindle. In addition the grip ping members are held by the locking device in contact with the roll when the spindle is braked.

It is also desirable to be able'to remove rapidly the bobbin of an empty roll. This involves disengagement of the gripping members from the roll.

According to a further feature of this invention, the ratchet parts are separated, by axial movement of the bobbin of the empty roll, and this permits the locking device to move relatively to the spindle to permit the automatic disengagement of the gripping members by radial resiliency of the bobbin of the empty roll.

FIG. 1 is a partially sectional side view of a spindle along the line I--I in FIG. 3, FIG. 2 an end view of the spindle in the direction of the arrow A in FIGURE 1,

FIG. 3 a cross-sectional view along the line III-4H in FIG. 1, and FIG. 4 a longitudinal sectional view along the line IVIV in FIG. 2 FIGS. 5 and 6 are illustrative of the mode of operation of a detail, and FIG. 7 is a view of the mandrel on which a roll of paper is mounted.

' Referring first to FIG. 7, referenceletter A'denotes a atent ice spindle which is connected to a shart 40 which is mounted for rotation in a frame 41 by means of a ball bearing 42. Mounted on the spindle A is a roll of paper B which is wound up on a bobbin 30 which may consist of tightly wound paper. The bobbin 30 has a certain inherent radial resiliency, as is well known in the art. The shaft 40 is suitably driven by a motor, not shown, and may be combined with a braking mechanism, not shown, such as a friction brake of conventional type.

As will be seen from FIG. 4 which shows a longitudinal section of the spindle A from the axis of rotation to the periphery, the spindle comprises a core 1 which has a conical portion 1a to be connected to the shaft 40 which may be driven by an electric motor, not shown. The core has a central bore 2 for a locking screw which can be screwed into the driving shaft 40. The core further has a plurality of substantially axial grooves 3. Each groove has a rounded bottom 4 (FIG. 3) and

side walls

5 and 6 which make an angle with each other as viewed in crosssection. The grooves receive pivotally mounted gripping members 7 for the roll of paper. Each gripping member is rounded at its inner end in accordance with the shape of the bottom 4 of the groove 3. At its radially inner end, each gripping member, as shown in FIG. 4, has journals 8 one of which enters a bore 9 in the core 1, whereas the other one enters a bore 10 in a front ring 11 which is bolted to the core by means of screws 12, FIG. 2, and also serves to limit axial movement of the gripping members along the grooves 3.

The grooved portion 111 of the core 1 is surrounded by a sleeve 15 which i slightly conically tapering outwardly and formed with axial apertures or slots 16 through which the tongue-like clamping portions of the gripping members 7 extend outwardly. The sleeve 15 is mounted for turning movement as well as axial displacement relatively to the portion 1b of the core 1. Longitudinally, the gripping members snugly fit the slots 16 so that they will be axially displaced together with the drum.

The sleeve 15 is connectible to the core by a ratchet comprising locking teeth 17 which are arranged in a closed circle and extend axially on a flange 18. The locking teeth 17 are engaged by locking members or dogs 20 provided in the core 1 or, as illustrated, in a separate ring 21 which by means of screws 22 is secured to the core. The locking dogs are axially displaceably mounted in bores 23 and biased by compression springs 24. Each locking dog has a flange 25 adapted to abut against a shoulder in the ring '21 for limitation of the outward movement of the dogs. The flange 25 is guided in the ring '21 such as to prevent the dog from turning in its bore. A suitable number of locking dogs 29 are circumferentially spaced apart.

In the position illustrated, the ratchet means 17, 20 is engaged. At the start when a new roll of paper is to be mounted on .the spindle, the sleeve 15 and the gripping members 7 are in their left hand end positions and the dogs 20 are not in engagement with teeth 17. In this position, the gripping members 7 assume the extreme slanting positions with respect to the radial position, as shown in FIGS. 3 and 5, where the outer ends of the gripping members but slightly project from the outer surface of the sleeve 15, but nevertheles areable to engage the wallof the central bore of the bobbin of aroll of paper which is slid onto the spindle. As the roll of paper is slid onto the sleeve 15, the sleeve will be moved to the right as viewed in FIG. 4 and the teeth 20 engage the ring 17. When at the same time or thereafter the core 1 is rotated by the shaft 40 in the direction of the arrow p, FIG. 5, the gripping members 7, due to the relative movement between the core and the roll which lags because of its inertia, is pivoted in the core towards its dead center position and gradually increase the hold of the bobbin 3i of the roll until the core 1 and the roll 13 are firmly connected with each other; this movement is permitted by the ratchet, the dogs sliding over the oblique faces of the teeth 17. Finally, the roll is locked to the spindle A in one direction by the gripping members 7 and in the other direction by the sleeve 15 which is prevented from turning on the core by the

ratchet

17, 20, the sleeve thus constituting a locking device for the gripping members.

After the roll of paper has been speeded up to the required velocity and the paper sheet has assumed its operative position in the printing machine, a braking action may be applied through the driving shaft 40 to the spindle A. The braking force is transmitted to the roll by the gripping members 7, which are prevented from pivoting from the position of FIGURE 6 to the position of FIGURE by the sleeve; the sleeve is now prevented from turning on the core by the

ratchet

17, 20.

The mode of operation of the gripping elements 7 is diagrammatically illustrated in FIGS. 5 and 6. FIG. 5 shows a gripping member in the position which it assumes when a roll of paper B is slid onto the spindle. When the spindle 1 rotates in the direction of the arrow p, the gripping members gradually increase their hold of the bobbin until the position shown in FIG. 6 is obtained in which the pants are firmly connected to each other. This clamping position is usually obtained very quickly, say after a turning movement of a few degrees. The central longitudinal plane 31, FIG. 6, of the gripping members is always located lateral of and on the same side of the axis 32 of the spindle so that, in operation, the gripping members do not reach the dead center position. In FIG. 2, the gripping members are shown in extreme positions which never occur in practical operation.

After the paper has been wound oif, the bobbin 30 has to be removed from the spindle to give way for a new roll of paper. When the bobbin is drawn oif it imparts a short axial movement to the gripping members and the sleeve 15, resulting in that the locking teeth 17 are disengaged from the dogs 20. Consequently, the sleeve can turn freely relative to the core 1 of the spindle, and also the gripping members are free to pivot in their slots. Due to its inherent radial resiliency, the bobbin 30 exerts a pressure on the gripping members 7 in the direction of the arrow p FIG. 6. This pressure causes a relative turning movement of the

parts

1 and 15, 80 due to which the gripping members are moved back to the position shown in FIG. 5 and loosen their firm hold on the bobbin 30 which then can be easily drawn ofi the spindle.

Due to the arrangement described, a roll of paper can be automatically locked to a driving spindle in both directions of rotation, and the locking engagement can be readily released by a simple axial movement of the roll to be exchanged. As a result, the necessary operations are considerably simplified as compared with conventional arrangements.

It should be possible to engage the

members

17 and 20 in short circumferential steps so as to ensure fine adjustment of the locking movement without any play. Nevertheless very strong locking teeth may be used if the circumferential spacing of the locking dogs or of groups of locking dogs is other than the circular pitch of the locking teeth. By way of example, sixty-three teeth 17 may be provided and six locking teeth may be equally circumferentially spaced apart. In this case a group of dogs will be active upon turning of the toothed member through a distance equal to half the circular pitch of the teeth.

What I claim is:

1. In a printing machine, a drive mandrel comprising a spindle, said spindle comprising a core adapted to be driven by a power source and a sleeve axially slidable and turnably mounted on said core and having a number of apertures, said sleeve being such that it is adapted to enter the bore of a roll of material; gripping members pivotally mounted in grooves in said core to project through said apertures in said sleeve and adapted to be pivoted towards their dead center position into firm engagement with said roll to connect said roll to said core by relative movement of said spindle relatively to said roll caused by'inertia' of said roll upon starting to rotate; and a ratchet which comprisesa ring of teeth on said sleeve and at least one dog on said core arranged to permit said sleeveto turn relatively to said core in one direction to enable'said gripping members to engage said roll and to prevent said sleeve from turning relatively to said core in the opposite direction whereby the edges of said apertures in said sleeve engage said members to prevent them moving out of firm engagement with said roll, and mounting of said roll on saidsleeve slides said sleeve on said core in oneaxial direction to move said ring into engagement with said dog andremoval of said roll slides said sleeve in the opposite axial direction to'move said ring out of engagement with said dog, so that said roll, by virtue of its radial resilience, is thereupon able to move said gripping members out of firm engagement with its bore.

2. In a printing'machine, a drive mandrel comprising a spindle, said spindle comprising a core adapted to be driven by a power source and a sleeve axially and turnably slidably mounted on said core and having a number of apertures, said sleeve being'adapted to enter the bore of a roll of material; gripping members in the form of longitudinally extending plates whose radial inner ends are pivotally mounted and axially displaceable in axial grooves in said'core and which extend through axial apertures in said sleeve, said members being closely surrounded by the edges of said apertures and pivotable towards their dead centerposition into firm engagement with the bore of said roll to connect said roll to said core by relative movement of said spindle relatively to said roll caused by inertia of said roll upon starting to rotate; and a. ratchet arranged to permit said sleeve to turn relatively to said core in one direction to enable said gripping members to engage said roll and which prevents said sleeve from turning relatively to said core in the opposite direction whereby the edges of said apertures in said Sleeve engage said members to prevent them moving out of firm engagement with said roll, said ratchet comprising a toothed ring on said sleeve and a plurality of spring biased dogs on said core whereby mounting of said roll on said sleeve slides said gripping members and said sleeve in one axial direction on said core to move said ring into engagement with said dogs and removal of said roll slides said gripping members in their grooves and said sleeve in the opposite axial direction to move said ring out of engagement with said dogs so that said roll, by virtue of its radial resilience, is thereupon able to pivot said gripping members out of firm engagement with its bore.

3. In a printing machine, a mandrel for a roll of material comprising a rotatably mounted core tapering at its free end and a sleeve turnably mounted on said core and having a number of apertures, said sleeve being such that it is adapted to enter the bore of the roll; gripping members pivotally mounted in grooves in said core to project through said apertures in said sleeve and adapted to be pivoted towards their dead centre position into firm engagement with said roll to connect said roll to said core by turning movement of said sleeve relatively to said core; said sleeve being slidable on said core in axial directions thereof; and a ratchet which comprises a ring of teeth on said sleeve and at least one dog on said core arranged to permit said sleeve to turn relatively to said core in one direction to enable said gripping members to engage said roll and to prevent said sleeve from turning relatively to said core in the opposite direction whereby the edges of said apertures in said sleeve engage said members to prevent them from moving out of firm engagement with said roll, and mouting of said roll on said sleeve slides said sleeve on said core in one axial direction to move said ring into engagement with said dog, and removal of said roll slides said sleeve in the opposite axial direction to move said ring out of engagement with said dog.

References Cited in the file of this patent UNITED STATES PATENTS 1,188,369 Chernack June 20, 1916 1,858,607 Whalen May 17, 1932 FOREIGN PATENTS 530,480 Great Britain Dec. 12, 1940 I 139,151 Sweden Feb. 17, 1953