US3019999A

US3019999A - Winding device

Info

Publication number: US3019999A
Application number: US57451A
Authority: US
Inventors: Schiff Norman
Original assignee: Johnson and Johnson
Current assignee: Johnson and Johnson
Priority date: 1960-09-21
Filing date: 1960-09-21
Publication date: 1962-02-06
Anticipated expiration: 1979-02-06

Description

Feb. s, 1962 N. SCHIP-F 3,019,999

WINDING DEVICE Filed Sept. l, 1960 3 Sheets-Sheet 1 @wbr-208g? ATTO R N EY N. SCHIF F WINDING DEVICE Feb. 6, 1962 3 sheets-.sheet 2 Filed sept.y 21, 1960 INVENTOR J @W ATTORNEY y BY Feb. 6, 1962 N. scHlFF 3,019,999

WINDING DEVICE Filed Sept. 21, 1960 3 Sheets-Sheet 3 f J9 a 2 L a if;

@AC/yq@ United States Patent 3,019,999 Patented Feb. 6, 1962 ice 3,019,999 WENDING DEVICE Norman Schiff, Franklin Park, NJ., assigner to Johnson da liohuson, a corporation of New Jersey Filed Sept. 21, 1960, Ser. No. 57,451 6 Ciatms. (Cl. 242-7551) This invention relates to a mechanism and method for winding a web of sheet material having little body and which deforms readily as by wrinkling even under slight tension. Winding is accomplished in a way such that in the finished roll the material is devoid of Wrinkles and has good edge alignment as between its various convolutions.

Wrinkles formed by the application of tension in material of this type will, if allowed to remain in the web as it is wound up, become permanent creases and render y the material unt for its intended use. Furthermore, it such a web is kept under tension at all times during the winding operation, its extreme lack of rigidity Will render ineffective the use of guiding devices which apply pressure to the edge of the web in order to locate it appropriately.

In accordance with the invention web material is wound upon a reel mounted on a spindle, As the spindle rotates to effect the windup operation it necessarily imparts some tension to the web which forms longitudinal Wrinkles to which reference has just been made. At a given phase in each revolution of the Windup spindle, the windup torque exerted thereon is interrupted and the spindle freed. During this period of interruption, devices associated with the spindle cause it to reverse its rotation for a fraction of a revolution to render the material in the outer convolution of the Wound up roll loose and devoid of tension.Y Since permanent deformation has not taken place, removal of tension has the etfect of allowing the loose material in the outer convolution to return to its normal unwrinkled state. Whenwindup torque is again applied, the spindle resumes rotation in a normal direction and the loose material is first wound up under substantially no tension until it lies iiat on the underlying convolution before any substantial tension is again exerted in the web to pull it along from the source ot' material from which it is obtained.

Obviously too, when a web of such material is longitudinally wrinkled under tension, its width from edge to edge will have been reduced and, if the wrinkles are wound into the web, registration of the edges of the various convolutions one with another will be absent. However, if the windup reel is equipped with edge guide means they will, when the web assumes its normal width upon release of tension, serve appropriately to position the edges of the web during the takeup of the loop and prior to the continued exertion of tension as the windup operation proceeds.

A better understandingof the invention lmay be had by reference to the accompanying drawings wherein:

FIG. l is a perspective view of a machine equipped with the present improvements, parts of the machine being cut away to expose its operating parts;

FIG. 2 is a perspective view of part of the machine shown in FIG. l, but at a different phase in its cycle of operation;

FIGS. 3, 4, 5 and 6 illustrate diagrammatically the formation and dissipation of looseness in the web material during different phases of a windup cycle; and

FIG. 7 is a wiring diagram better to illustrate operation of certain of the parts.

A roll of material 19 having a tendency to deform longitudinally into wrinkles upon application of longitudinal tension is supported on a spindle 11 fixed in the near side member'of v'the machine frame and from which the material in the form of a web 12 is unwound as it travels forward through the machine to and through a mechanism 13 which may perform any suitable and desired operation on the web (FIG. l). From this mechanism the web 12 advances at constant linear speed through the machine under the inuence of a pair of closely spaced

pull rolls

14, 15 mounted one above the other on parallel shafts 16, 17 transverse to the webs travel and which engage the web, one from above andthe other from below. The parallel shafts 16, 17 are jour naled for rotation in the near side frame member of the machine and a chain driven sprocket 13 on the lower shaft drives both the rolls in opposite directions to advance the web through the medium of a pair of meshing pinions 19, 2h fixed one on each of said shafts.

The web 12 passes up and partially around the top pull roll 15 and then in an S path between it and an overlying idler roll 21 mounted for rotation on a transverse shaft 22 tixed in the machine frame.

From the idler roll 21 the web 12 advances at controlled speed as determined by the speed of rotation of the

pull rolls

14, 15, to a windup reel 23 lixed on and against relative rotation with respect to a transverse windup shaft 24 journaled at one position along its length in the near side frame member of the machine. The windup shaft is connected through a magnetic clutch 25 whose casing has a fixed support in the machine frame with another shaft 26 in axial alignment with the windup shaft and which likewise is journaied for rotation in the far side frame member of the machine. A sprocket 27 iixed on this shaft is driven by a chain 28 from a sprocket 29 fixed on the same shaft 17 which, it will be recalled, accommodates the top one of the pull rolls which is instrumental in controlling the speed of travel of the web through the machine. The windup shaft thus has a common drive with the pull rolls.

The ratio of the sprockets 27, 2% is such that the shaft 26, when the magnetic clutch is energized, tends always to drive the windup reel at a speed in excess of that per- -mitted by the pull roll controls and consequently at a speed which always exerts tension on the traveling web during the windup operation. However, since the magnetic clutch 25 is a slip clutch, the slippage which takes place permits the speed of the windup shaft 24 to accommodate itself to the increasingdiameter of the roll on the real windup. The tension in the web 12 which re'-V sults from the tendency lof the magnetic clutch to over-V variety and, by way of example, that may be used which is sold under the trademark Magueclutch by Vickers Electric Division of Vickers Inc. St. Louis, Missouri, and illustrated in Bulletin No. GOGO-A, 11-53, and in Supplement No. l of that bulletin, published by that cornpany. rthe magnetic clutch is energized from a source of D C. current to which reference is made hereinafter. Switch contacts 30 in the D C. current circuit effect a driving connection to the wndup shaft 24 by energizingV the magnetic clutch 25 when the switch is closed and disestablishes the driving connection when the switch is`v open. Opening and closing of the switch may be under the control of a rotatable edge cam 31 having high and low portions, and driven from a timing motor 32. In the particular embodiment shown, the normal position of the switch, i.e.,` when the cam is at rest, is its closed this circuit remains established for so long as the switch arm 33 continues on the high portion of the cam back to its normal position and for so long also as the cam then remains at rest. Normally closed contacts 45 in the relay holding circuit are momentarily opened near the conclusion of the timing motor cycle. This acts to break the relay holding circuit with consequent disengagement of the contacts 42 which were established upon operation of the switch 34 initially closed by the movement of the crank arm 315, and the parts are then ready for the next cycle of operation of the machine. As previously stated, closing of the crank arm operated switch 34 by upward movement of the crank arm immediately after it has dropped back to vertical position with deenergization of the magnetic clutch, has no eect because at that time the holding circuit through the relay 4i) remains operative.

A suitable Atiming motor, magnetic controls therefor, and cam controlled switch operated thereby are available on the market. One such suitable device is a Series RC single cycle multi-cam timer described in Bulletin No. ZOO which together with operating instruction sheets for such timers are published by Industrial Timer Corporation of Newark, New Jersey.

The invention has been described in connection with one embodiment thereof only and many modifications are included within its spirit. The invention therefore is to be limited only by the scope of the pending claims.

What is claimed is:

l. A windup device for a traveling web of sheet material wh-ich comprises: a source from which the traveling web of sheet material is delivered at a controlled speed, means including a windup shaft on which the traveling web of sheet material is wound, devices for applying torque to the windup shaft tending to rotate the shaft in one direction to wind up the material at a speed greater than the controlled speed, and means including devices for periodically interrupting the application of said torque and for applying said torque again after a controlled period of interruption, said last mentioned means including also instrumentalities for reversing the rotation of said shaft during said period of interruption.

2. A windup device for traveling web of sheet material which comprises: a source from which the traveling web of Sheet material is delivered at controlled speed, meanstincluding `a windup shaft on which the traveling web of sheet material is wound, devices including a slip clutch adapted when engaged to transmit torque to the windup shaft tending to rotate the shaft in one direction to wind up the material at a speed greater than the controlled speed, yand means including devices for periodically disengaging the clutch to 4interrupt transmission of said torque and for re-engaging the clutch again after a controlled period of interruption, said last mentioned means including also instrumentalities for reversing rtation of said shaft during the period when the clutch is disengaged.

3. A windup device for a traveling web of sheet material which comprises: a source from which the traveling web of sheet material is delivered at controlled speed, means including a windup shaft on which the traveling web of sheet material is wound in convolutions, devices including a slip clutch adapted when engaged to transmit torque to the windup shaft tending to Wind up the web of sheet material in one direction at a speed greater than its controlled speed of delivery, and when disengaged to interrupt transmission of torque to the windup shaft, means for disengaging and re-energizing the clutch once during the winding of each convolution of web material, and instrumentalities for reversing rotation of the shaft during the period when the clutch is disengaged whereby substantially tension-free material is made available in the travelling web from which web material is rewound upon the roll upon re-engagement of the clutch.

4. A windup device for a traveling web of sheet material which comprises a source from which the traveling web of sheet material is delivered at controlled speed, means including a windup shaft on which the traveling web of sheet material is wound, devicesV including a slip clutch adapted when engaged to transmit torque to the windup shaft tending to wind up the web of sheet material in one direction lat -a speed greater than its controlled speed of delivery, and when disengaged to interrupt transmission of torque to the windup shaft, means controlled from the `windup shaft for disengaging and Lre-engaging the clutch once during the winding of each convolution of web material, and instrumentalities including a weighted crank arm for effecting a reverse movement of the windup shaft through ya portion of a revolution during the period when the clutch is disengaged whereby substantially tension-free material is made available in the traveling web from which web material is rewound upon the roll upon reengagement of the clutch.

5. A windup device for la traveling web of sheet material which comprises a source from which the traveling web of sheet material is delivered at controlled speed, means including a windup shaft on which the traveling web of sheet material is wound, devices including a magnetic clutch adapted when energized Vto transmit torque 1to the windup shaft tending to wind up the web of sheet material in one direction at a speed greater than its controlled speed of delivery and when de-energized to interrupt transmission of torque to the windup shaft, a circuit containing the magnetic clutch together with a switch operable to control energization and de-energization of the clutch, a timing device associated with the switch for determining the period the clutch is de-energized and having a cycle of operation inaugurated under the control of the windupshaft, and means associated with the shaft for effecting reverse rotation of the shaft during the period the clutch is de-energized whereby substantially tension-free material is made available in the last wound convolution of web material from which the web material is rewound upon the roll when the magnetic clutch is re-energized.

6. A windup device for a traveling web of sheet material which comprises a source from which the traveling web of sheet material is delivered at controlled speed, means including a windup shaft on which the traveling web of sheet material is wound, devices including a magnetic clutch adapted when energized to transmit torque to the windup shaft tending to wind up the web of sheet material in one direction at a speed greater than its controlled speed of delivery land when de-energized to interrupt transmission of torque to the windup shaft, a circuit containing the magnetic clutch together will a switch operable to control energization and de-energization of the clutch, a timing device associated with the switch for determining the period the clutch is de-energized and having -a cycle of operation inaugurated under the control of the windup shaft, means associated with the shaft for effecting reverse rotation thereof during the period the clutch is de-energized whereby substantially tension-free material is made -available in the last wound convolution of web material from which the web material is rewound upon the roll when the magnetic v clutch again is `re-energized, and a common drive shaft for the source yfrom which the traveling web of sheet material is delivered to the windup device Iand from which torque for rotating the windup shaft is delivered through the magnetic clutch.

References Cited in the file of this patent UNITED STATES PATENTS 1,209,755 Power Dec. 26, 1916 2,946,534 Allendorf July 26, 1960 FOREIGN PATENTS 468,068 Canada Sept. 12, 1950