|Publication number||US3806054 A|
|Publication date||Apr 23, 1974|
|Filing date||Jul 28, 1972|
|Priority date||Jul 28, 1972|
|Publication number||US 3806054 A, US 3806054A, US-A-3806054, US3806054 A, US3806054A|
|Inventors||Johnson J, Taylor R|
|Original Assignee||Royal Industries|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (15), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1 Johnson et a1. g
[ RIBBON DE-REELER  Inventors: John R. Johnson, Arcadia; Robert W. Taylor, Mission Viejo, both of Calif.
 Assignee: Royal Industries, Inc., Pasadina,
 Filed: July 28, 1972  Appl. No.: 276,135
Primary Examiner-.1ohn W. Huckert Assistant Examiner-Edward J. McCarthy Attorney, Agent, or Firm-Christie, Parker & Hale [4 1 Apr. 23, 1974 [5 7 ABSTRACT A reel of ribbon-like material disposed on a turntable is unwound by pulling the ribbon in a direction perpendicular to the plane of the turntable. The unwound ribbon passes through a sensor which prevents the ribbon from twisting as it is being unwound. The sensor includes a rotatable disc spaced above the turntable anzl having an opening through which the ribbon is pulled in response to a demand from an external system, such as a machine for applying tie-strips to packages or the like. The disc rotates between two fixed positions to close and open a switch for actuating and de-actuating an electrical circuit coupled to a motor which drives the turntable. When the ribbon is being pulled, it rotates the disc to a position which closes the switch to continuously drive the turntable at the rate at which the ribbon is being unwound to continuously reduce the twist in the unwound ribbon. When the ribbon demand stop, a biasing spring rotates the disc through a short distance to reduce the twist present in the unwound ribbon at the instant the demand stopped. The disc stops in a position which opens the switch to stop the turntable rotation.
10 Claims, 2 Drawing Figures I un RIBBON DE-REELER BACKGROUND OF THE INVENTION This invention relates to a system for unwinding a reel of ribbon-like material, such as tie-strip ribbon.
Tie-strips generally comprise wire reinforced ribbons .of plastic or paper which can be twisted to form a tie.
Tie-strip ribbon is reinforced by a narrow gauge, low carbon steel wire which provides sufficient reinforcement, but is thin and ductile enough to allow the ribbon to be twisted easily.
A major use of tie-strip ribbon is in the tying of packages for food products such as bakery goods, produce, and meat products. The packaged product generally is fed to a tying machine which alternately unwinds a section of tie-strip ribbon from a large spool, splices the ribbon, and twists the ribbon around the package to form a tie.
The tying machine usually includes a de-reeler which assists in unwinding the tie-strip ribbon from the large spool. Some prior art de-reelers comprise turntables on which the large spool of ribbon is mounted. The ribbon is pulled from the spool at a right angle to its vertical axis of rotation. These de-reelers generally are used to unwind metal strip material which is stiff enough to cause the turntable to rotate without damaging the strip. They are not used for unwinding tie-strip ribbon, because the large inertia of the tie-strip wrapping and the spool will break the ribbon each time the ribbon is pulled from the reel during the demand cycle of the tying machine.
Prior art de-reelers for tie-strip ribbon include a powered spindle which drives a spool of ribbon; The ribbon is pulled from the spool at a right angle to the spindle axis of rotation. The powered spindle is arranged such that the demand for ribbon is made by a pull which actuates a take-up arm having a motion used to control the spindle drivemotor.
SUMMARY OF THE INVENTION This invention is based on the recognition that prior art de-reelers have the disadvantage of being limited substantially by the weight of the ribbon and spool.
cause the ribbon to jam tight during unreeling as the ribbon is being pulled straight off the spool. A jammed or broken ribbon stalls tying operations and causes time-consumingand costly shutdowns. Lighter weight spools can be used, but tying operations are then interrupted more often to replace the empty spool. However, lighter spools still do not always alleviate the jamming problem caused by inadvertent cross-overs in the spooling operation.
This invention provides a system for unwinding a reel of ribbon-like material, in which the ribbon is unwound by pulling it off the reel in a direction substantially parallel to the winding axis of the reel. Ribbon unwound in this way does not oppose the inertia of the body of wound ribbon. Accordingly, relatively large wrappings of ribbon, say 3,000 feet of ribbon weighing several thousand pounds, can be used to supply a tying machine, without causing work stoppages due to breakage of the ribbon. Moreover, cross-overs inadvertently made during winding operations are not likely to jam tight during de-reeling operations, since the force applied to unwind the ribbon is relatively small when compared with the pulling force required for prior art de-reeling machines.
Briefly, the ribbon de-reeling system includes a movable sensor having an opening through which unwound ribbon is pulled from a wrapping in response to a demand from an external system, such as a tying machine. The sensor is adapted to be moved to a first position in response to the passage of ribbon through the opening. Drive means spaced from the sensor rotates the wrapping of ribbon, and switch means coupled to the drive means have actuated and de-actuated positions for controlling movement of the sensor. When the sensor is in its first position, the switch means applies an electrical signal to the drive means to continuously rotate the wrapping of ribbon whenever the ribbon is being pulled by the external system through the opening in the sensor. Thus, the twist existing in the ribbon between the wrapping and the sensor is continuously reduced by the drive means.
In a preferred form of the invention, means responsive to stoppage of the ribbon being pulled through the Thus, a relatively small pulling force is required to unwind a relatively large wrapping of ribbon, and the twist which exists in the ribbon as it is being unwound is continuously reduced, so that the ribbon does not jam the de-reeler or the external system demanding the ribbon.
BRIEF DESCRIPTION OF THE DRAWING These and other aspects of the invention will be more fully understood by referring to the following detailed;
description and the accompanying drawing in which: FIG. 1 is an elevation view illustrating the ribbon dereeler embodying the present invention; and
FIG. 2 is a plan elevation view taken on line 22'of FIG. 1 and illustrating the de-reeler in the de-reeling operating position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a ribbon de-reeling machine 10 includes a horizontally disposed turntable 12 for mounting a reel 14 of ribbon-like material 16, such as tie-strip ribbon. The ribbon preferably is coiled around a vertically extending spindle (not shown) or the like. Preferably, the de-reeling machine is not used to unwind ribbon wrapped around spools or similar articles having flanged ends which would overlie a horizontally extending upper surface 18 of the coiled ribbon. Thus, ribbon 16 can be unwound from reel 14 by applying a relatively small upward force in a direction substantially parallel to theaxis around which the, ribbon is wound. I
The de-reeling machine is preferably used in conjunction with an external system having a cyclical demand for the ribbon. For example, such a system can be a tying machine which alternately unwinds a short length of the ribbon, stops the unwinding operation, splices the ribbon, twists the ribbon to form a tie, and then unwinds the ribbon for the next tying cycle. During unwinding operations, the ribbon is reeved over a pair of longitudinally spaced apart guide rolls 20 mounted on a horizontally disposed support arm 22 overhanging the turntable and ribbon reel.
The turntable is mounted inside a rectangular framework which includes a pair of laterally spaced apart side posts 24 for supporting a horizontal support platform 26 disposed over the turntable and ribbon reel. Support platform 26-supports a sensor 28 disposed over an opening 30 in the platform. Ribbon is drawn through the sensor and opening 30 prior to being reeved over the guide rolls 20. The detailed construction and operation of sensor 28 is described below.
As the ribbon is being unwound from the reel, a spiral twist is formed in the unwound ribbon between the reel and sensor 28. As the ribbon is being unwound, the turntable is rotated by a conventional electrical drive motor 32 at a rate whichfollows the ribbon demand so as to'continuou sly reduce the twist in the unwound ribbon. If the turntable is-not rotated as the ribbon is being unwound, the ribbon will almost immediately bind and will then jam either sensor 28 or the external system demanding it. Sensor 28 controls unwinding of the ribbon to continuously reduce the twist formed in the ribbon as it is being unwound by the external system. As shown best in FIG. 2, the sensor includes a rotatable disc 34 journaled for rotation in an anti-friction ball-bearing 36, which. inturn is mounted on a base 38. An elongated sleeve 40 having a narrow, substantially rectangular opening through it is aligned with a matching opening (not shown) in the center of the disc, and is rigidly secured to the disc to rotate with it. An externally threaded, elongated shaft 42 having acentral bore is rigidly secured to the disc so as to encompass sleeve 40. A nut 44 is threaded onto the end of shaft 42 to hold the disc in place on base 38. 7
An elongated stop arm 46, which is preferably made of strip metal,.is releasably secured to base 38 by a screw 48 extending through an elongated slotted opening 50 in one end of the arm. An elongated arcuate v opening 52 extends through the free end portion of the stop arm and encompasses a post 54 rigidly secured adjacent to the periphery of the disc. Opening 52 and post 54 limit rotational travel of the disc to an arc of about The releasable attachment of stop arm 46 to the base provides a position adjustment for the are through which the disc travels.
In use, ribbon unwound from the reel is passed through the opening in sleeve 40, through its matching opening in the disc, and through opening 30 in platform 26. When. the external system pulls the ribbon, the
force of the ribbon passing through sleeve 40 causes the disc to rotate in a clockwise direction to the position shown-in FIG. 2, with post 54 being held at the far right-hand edge of opening 52 to limit further travel of the disc. As long as ribbon is being pulled through the opening of the sensor, the disc remains in the position shown in FIG. 2.
A hollow, open-ended, frusto-conical guide 56 is mounted on the turntable over the reel with its small opening adjacent the sensor. The small opening in the guide confines the ribbon loops between the reel and the sensor so that they do not foul each other as the ribbon is being unwound.
The turntable motor is operated by an electrical control circuit (represented schematically at'57) which includes a conventional reed switch 58 mounted on base 38 adjacent the outer periphery of the disc and operated by a permanent magnet 60. Permanent magnet 60 is carried on the bottom side of the disc adjacent its outer periphery. Permanent magnet 60 is positioned so it is remote from the reed switch when ribbon is being pulled through the sensor opening as illustrated in FIG. 2. During a period of ribbon demand, when the disc is held in the position shown in FIG. 2, the reed switch contacts are closed, and the electrical circuit supplies power to drive motor 32 to rotate turntable 12 to reduce the twist formed in the unwound ribbon 16.
A torsion spring 62 is attached at one end to nut 44 and is wound around the nut and then attached at its opposite end to a block 64 on base 38. In use, when the demand for ribbon stops, the tension in the ribbon is released immediately, and the spring rotates disc 34 in the direction of the arrow 66 shown in FIG. 2. The disc rotates until post 54 strikes the opposite edge of opening 52, and the disc is then-held in this position as long as no pull on the ribbon is produced by-the external-system. counterclockwise rotation of the disc to the opposite end of opening 52 causes permanent magnet 60 to rotate over reed switch 58, where the magnetic field of the magnet opens the switch and cuts off power to drive motor 32. The drive motor 32 is normally maintained de-energized until the ribbon demand is again called for so as tooperatethe reed switch 58. The rotation of the disc through the approximately 15 are eliminates the twist present in the ribbon at the instant the ribbon demand stopped. The permanent magnet operates the reed switch to stop the turntable at the instant thetwist is eliminated, so that no twist is present-at the beginning of the next cycle.
The 15 arc is shown by way of example only. The length of the arc can be varied to correspond to the amount of twist in .the ribbon, or the distance between the reel and the sensor, so that twisting of the ribbon is prevented as it is. being unwound by the external system. Alternatively, other parameters, such as the speed of the turntable, or the position of arcuate opening 52 relative to the disc, can be adjusted to correspond to the amount of twist in the ribbon or the distance between the reel and the sensor.
Since a relatively small amount of force is required to unwind the ribbon, large reels, say 3,000 feet of ribbon weighing up to 30,000 pounds, can be unwound with substantially no shutdowns caused by cross-overs in the ribbon or breakage. A poor spoo'ling job is not as likely to cause jamming or breaking during unwinding, as when tie-strip ribbon is pulled' directly off a spool. Moreover, a spool is not required for holding the ribbon during unwinding. The ribbon can be wound on a mandrel and then wrapped to hold it ready to place on the turntable. y
1. Apparatus foruse in unwinding a wrapping of ribbon-like material comprising a sensor having an opening through which ribbon unwound from the wrapping is pulled in response to a demand from an external system, the sensor being movable to a preselected position in'response to the ribbon being pulled through said opening by the external system, drive means spaced from the sensor and operable for rotating the wrapping of ribbon, the ribbon drive means being positioned relative to the sensor to provide substantially unobstructed passage of the ribbon through the opening in the sensor when ribbon is being unwound on demand from the external system, and electrical circuit means including switch means coupled to the ribbon drive means and having an actuated position controlled by movement of the sensor for energizing the ribbon drive means, the sensor being movable to actuate the switch means when the sensor is movedto said preselected position toapply an electrical signal to the ribbon drive means to continuously rotate the wrapping of ribbon when the ribbon is being pulled by the external system through the opening in the sensor, whereby the twist existing in the ribbon between the wrappingand the sensor is continuously reduced by the drive means.
2. Apparatus according to claim 1 in which the sensor is movable between said preselected position and a second position, and including means responsive to stoppage of the ribbon being pulled through the opening in the sensor by the external system for moving the sensor to the second position to thereby reduce the twist existing in the ribbon between the wrapping and the sensor at the time the ribbon demand is stopped, the switch means being put in a deaetuated position in response to movement of the sensor to the second position to de-energize the ribbon drive means to cut off the electrical signal to the drive means andstop movement of the drive means.
3. Apparatus according to claim 1 in'which the ribbon drive means is a turntable for supporting the wrapping of ribbon, and including means for pulling the ribbon from the wrapping through the opening in the sensor along an axis substantially perpendicular to the plane of the turntable.
4. Apparatus according to claim 3 including an openended, frusto-conical guide having a hollow interior to allow the guide to be mounted on the turntable over the wrapping in the space between the turntable and the sensor, the guide being mounted so that the opening at its smaller end is adjacent to the sensor.
5. Apparatus according to claim 1 in which the sensor is a rotatable member and said opening comprises a narrow elongated passage extending through the axis of rotation of the rotatable member to receive the unwound ribbon, the passage being positioned with respect to the ribbon drive means to allow tension applied to the ribbon when the ribbon is beingpulled through the passage to rotate the rotatable member to said preselected position and hold the member in its preselected position as long as tension is being applied to the ribbon.
6. Apparatus according to claim 2 in which the sensor is a rotatable member and said opening comprises a narrow elongated passage extending through the axis of rotation of the rotatable member to receive the unwound ribbon, the passage being positioned with respect to the ribbon drive means to allow tension applied to the ribbon when the ribbon is being pulled through the passage to rotatethe rotatable member to said preselected position.
7. Apparatus according to claim 6 in which the means for moving the rotatable member to its second position includes biasing means coupled to the rotatable member for urging the member to rotate to its second position when the tension on the ribbon being pulled through the passage is released and hold the member in its preselected position as long as tension is being applied to the ribbon.
8. Apparatus according to claim 2 in which the sensor is a rotatable disc, and including stop means disposed adjacent to the disc at two spaced apart locations to limit rotation of the disc between said two positions.
9. Apparatus according to claim' 8 including means for adjusting the position of the stop means relative to the disc.
10. Apparatus according to claim 2 in which the sensor comprises a rotatable disc carrying a switch actuating and deactuating device which is movable by rotation of the disc into and out of contact with an electrical switch disposed adjacent to the disc.
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|International Classification||A47F13/04, B65H49/18, B65B13/18|
|Cooperative Classification||B65H2701/37, B65H49/18, A47F13/04, B65B13/18|
|European Classification||B65B13/18, B65H49/18, A47F13/04|