Patent Application
20190059526
This disclosure relates to an apparatus for mounting a slider onto a recloseable plastic zipper closure and methods for doing so.
Many packaging applications use resealable containers to store or enclose various types of articles and materials. These packages maybe be used to store food products, non-food consumer goods, medical supplies, waste materials, and many other articles. Resealable packages are convenient in that they can be closed and resealed after the initial opening to preserve the enclosed contents.
Some types of resealable packages include bags made from polymer and include a plastic zipper having two interlocking profiles and a slider for opening and closing the zipper. Typically, the slider straddles the zipper and has a separating finger or plow at one end that is inserted between the profiles to force them apart as the slider is moved along the zipper in an opening direction. The other end of the slider is sufficiently narrow to force the profiles into engagement and close the zipper when the slider is moved along the zipper in a closing direction.
Manufacturing and production of resealable zippers with slider devices can be costly and time consuming. It is desirable provide an apparatus that overcomes the problems in the prior art, including an apparatus that automatically inserts sliders on zippers at a rate that keeps up with the production rate of the overall bag making machines. It is further desirable that such an apparatus is not costly, complex, or expensive to maintain.
An apparatus and method for operably mounting a slider onto a recloseable plastic zipper closure is provided that improves the prior art.
In one aspect, an apparatus for operably mounting a slider onto a recloseable plastic zipper closure includes a rotor having an outer periphery and at least one slider-engaging shoulder extending from the outer periphery. The outer periphery has a slot there along sized to accommodate a zipper closure therein. An insertion wedge is adjacent to a portion of the outer periphery of the rotor. The insertion wedge has a leading edge and a trailing edge and increases in thickness from the leading edge to the trailing edge. The insertion wedge is sized to slidably accommodate a slider for mounting onto a zipper closure. A zipper guide member is adjacent to the outer periphery of the rotor and is adjacent to the trailing edge of the insertion wedge constructed and arranged to guide and hold a zipper closure while a slider is mounted thereon. A guide finger is adjacent to the trailing edge of the insertion wedge and is constructed and arranged to prevent a slider from lifting away from a zipper closure as the rotor rotates.
In one embodiment, the apparatus further includes a pair of opposing walls on opposite sides of the rotor and an insertion pocket sized to hold a slider. The insertion pocket is defined by outer periphery of the rotor and the opposing walls.
The apparatus may further include a loading rack having an exit aperture oriented above and in communication with the insertion pocket. The loading rack is sized to hold one or more sliders before exiting by gravity through the exit aperture and into the insertion pocket.
The apparatus may further include a lower slider guide and an upper slider guide, each being adjacent to the trailing edge of the insertion wedge.
The apparatus may further include a motor driving the rotor.
In one or more embodiments, the rotor includes at least two slider-engaging shoulders and at least two sections. Each section has a variable curvature radius that increases continuously between a first radius and a maximum radius coinciding with one of the shoulders.
In example implementations, the rotor includes an inwardly extending curved relief area adjacent to each of the shoulders.
In some examples, the rotor is mounted to rotate in a plane vertically oriented relative to a ground surface.
The rotor may have, in some example embodiments, a rotor section between each of the slider-engaging shoulders; each of the rotor sections having a constant radius.
In some embodiments, the rotor is mounted to rotate in a plane horizontally oriented relative to a ground surface.
In some embodiments, the loading rack has a straight holding chute.
In some embodiments, the loading rack has a holding chute that is S-shaped.
In a further aspect, a method of operably mounting a slider onto a recloseable plastic zipper closure having interlocking tracks is provided. The method includes providing a plastic zipper closure with interlocking tracks, the tracks having top edges and bottom shoulders. The method also includes providing a slider having a top member and a pair of spaced legs depending from the top member. The legs have opposing hooks. The slider is constructed and arranged to release and interlock the interlocking tracks when operably mounted on the zipper closure, as the slider is moved relative to the zipper closure. The method further includes automatically moving the slider from an initial position toward the zipper closure along a curved path by using a rotating rotor having an outer periphery and at least one slider-engaging shoulder extending from the outer periphery and adjacent to a pocket accommodating the slider to push the slider from the initial position toward the zipper closure; while moving the slider, flexing apart the legs of the slider; while the legs are flexed apart, mounting the slider onto the zipper closure so that the legs straddle the tracks, and the top member is oriented on the top edges of the tracks; and allowing the legs to return to a pre-flexed position so that the hooks on the legs engage the bottom shoulders of the tracks.
In examples, the step of flexing apart the legs of the slider includes moving the slider along an insertion wedge having a leading edge and trailing edge, with the legs of the slider straddling the wedge, the wedge increasing in thickness from the leading to the trailing edge.
The step of automatically moving may include using a rotating rotor to push the slider from an initial position, along a curved path, to and along the insertion wedge, and then onto the zipper closure.
In one or more implementations, the step of mounting the slider includes moving the slider onto the zipper closure and under a guide finger to prevent the slider from moving upwardly away from the zipper closure.
In example implementations, the step of automatically moving the slider includes moving the slider along a curved path at least 90° from the initial position to the zipper closure.
The step of automatically moving the slider may include moving the slider along a curved path at least 150° from the initial position to the zipper closure.
In example embodiments, the step of providing a slider includes providing the slider from a loading rack.
In example implementations, the step of providing a slider includes allowing the slider to fall by gravity from the loading rack into the insertion pocket, the insertion pocket formed by an outer contour of a rotor and a pair of walls on opposite sides of the rotor.
The step of automatically moving may include pushing the slider with a shoulder on the rotor from the insertion pocket and through a curved path to the zipper closure.
The step of moving the slider along a curved path can include moving the slider along a plane vertically oriented relative to a ground surface.
The step of moving the slider along a curved path can include moving the slider along a plane horizontally oriented relative to a ground surface.
The step of providing the slider from a loading rack can include turning the slider from an upright position, with the top member oriented over the legs, to a side position by moving the slider along a holding chute in the loading rack
The method can include the apparatus as variously characterized above.
A variety of examples of desirable features or methods are set forth in part in the description that follows, and in part will be apparent from the description, or maybe learned by practicing various aspects of the disclosure. The aspects of the disclosure may relate to individual features as well as combinations of features. It is to be understood that both the foregoing general description and the following detailed description are explanatory only, and are not restrictive of the claimed invention.
A. Example Package and Closure
In
The package 10 can be many different arrangements. In the example shown, the package 10 includes first and second opposed panel sections 18, 20, typically made from a flexible, polymeric, plastic film. With some manufacturing techniques, the first and second panel sections 18, 20 are heat sealed together along two side edges 22, 24 and meet at a fold line 26 in order to form a three-edged containment section for a product within an interior 28 of the package 10. In the embodiment shown, the fold line 26 comprises the bottom edge 30 of the package 10. Access is provided to the interior 28 of the package 10 through an open mouth 32 along a top edge 34 of the package 10. In this embodiment, the mouth 32 extends the width of the package 10 between the side edges 22, 24. The mouth 32, in this embodiment, is opposite of the bottom edge 30. In other embodiments, the panel sections 18, 20 can be heat sealed together along the side edges 22, 24 as well as the bottom edge 30. Many alternatives are possible.
The zipper closure 14 is illustrated in the
The zipper closure 14 can be many different types of zipper closures. In this embodiment, and as illustrated in
The zipper closure 14 includes bottom shoulders 60, 62 between the closure profiles 40, 42 and the attachment flanges 44, 46. The shoulders 60, 62 can be used to help hold the slider 16 operably in place on the closure 14.
The tracks 36, 38 each has a top edge 47, 48 on an opposite end of the tracks 36, 38 from the shoulders 60, 62.
The zipper closure 14, in this embodiment, is solid and notchless. In other embodiments, the zipper closure includes a notch for serving as a parking place for a slider, as well as to facilitate mounting of the slider 16 onto the zipper closure. In embodiments of the zipper closure 14 that are notchless, to facilitate insertion of a separator finger (or plow) of the slider 16 between the tracks 36, 38, the zipper closure 14 can include a small gap 49 (
B. Example Slider
Many different types of sliders can be used to engage and release the zipper closure 14 in order to open and close access to the interior 28 of the package 10. The slider 16 shown in
In reference now to
The top member 50 may include a separator finger or plow (not shown), which can be used to release or disengage the interlocked profiles 40, 42.
In the embodiment of
The slider 16 can include ones such as those described in U.S. Pat. Nos. 6,376,035 and 6,293,701, each patent being incorporated herein by reference. In some arrangements, the slider 16 can include child-resistant features, such as the slider shown in U.S. Pat. No. 9,505,531, incorporated by reference herein.
C. Example Apparatus for Mounting the Slider onto the Zipper Closure
The apparatus 80 includes a slider insertion device 81 having a rotor 82. The rotor 82 is used to push the slider 16 from an initial position, along a path, and eventually onto the zipper closure 14. The path, in this embodiment, includes a curved path. While alternatives are possible, typically the curved path will be at least 90° from the initial position to the zipper closure 14. In many example embodiments, the curved path will be at least 150° and sometimes at least 180° from the initial position to the zipper closure 14.
Still in reference to
Still in reference to
In reference now to
The rotor 82 is mounted as part of the slider insertion device 81 to rotate about a center axis 100 (
The rotor 82 is free of additional moving parts, such as springs, cams, or radially expanding posts. This “moving-part free” design of the rotor 82 leads to advantages. For example, moving parts are subject to variations in position and alignment that require setup, that can move over time and affect performance. Moving parts are also subject to wear. Rotor 82 is not subject to these problems.
In accordance with principles of the disclosure, the apparatus 80 further includes an insertion wedge 104. The insertion wedge 104 helps to move the slider 16 from an unmounted position to a position which the slider 16 is operably mounted onto the zipper closure 14.
The insertion wedge 104 is located adjacent to a portion of the outer periphery 84 of the rotor 82. In this manner, the rotor 82 can push the slider 16 with one of the shoulders 86, 88 onto the leading edge 108 of the insertion wedge 104. The insertion wedge 104 is sized to slidably accommodate the slider 16 so that the legs 52, 54 will straddle the opposite sides of the wedge 104, slide along the wedge 104 from the leading edge 108 and to the trailing edge 110. While the slider 16 is being pushed by one of the shoulders 86, 88 along the wedge 104, the legs 52, 54 will be flexed apart due to the increasing thickness of the wedge 104. While the legs 52, 54 are flexed apart, the slider 16 is pushed off of the wedge 104 from the trailing edge 110 and onto the zipper closure 14, as will be explained further below.
In accordance with principles of this disclosure, the apparatus 80 further includes a zipper guide member 112. The zipper guide member 112 is constructed and arranged to guide and hold the zipper closure 14 while the slider 16 is mounted thereon. In the embodiment shown, the zipper guide member 112 is adjacent to the outer periphery 84 of the rotor 82 and adjacent to the trailing edge 110 of the insertion wedge 104. The zipper guide member 112, in this embodiment, includes a block 114 with a slot in which the zipper closure 14 extends through. The shape of the slot will be determined by the shape of the zipper closure 14 and is dimensioned such that the zipper closure 14 can be pulled through the slot of the guide member 112 without excessive drag and without excessive play that might result in misalignment between the slider 16 and the zipper closure 14 during insertion. Many embodiments for the guide member 112 are possible.
In accordance with principles of this disclosure, the apparatus 80 further includes an insertion pocket 116. The insertion pocket 116 is sized to hold the slider 16. The insertion pocket 116 is defined by the outer periphery 84 of the rotor 82 and a pair of opposing walls, one of which being shown at 118 on opposite sides of the rotor 82. The wall 118 illustrated is a back or rear wall, while the front wall is omitted for sake of clarity.
The apparatus 80 can have several insertion pockets 116. In the example shown, there are two insertion pockets 116, with each of the insertion pockets 116 being adjacent to one of the shoulders 86, 88.
In accordance with principles of this disclosure, the apparatus 80 further includes a loading rack 120. The loading rack 120 includes an exit aperture 122 that is oriented in communication and vertically above the insertion pocket 116. The loading rack 120 is sized to hold one or more sliders 16 in a holding chute 121 before exiting by gravity through the exit aperture 122 and into the insertion pocket 116. In this embodiment, the holding chute 121 is straight with a central longitudinal axis generally perpendicular to a horizontal ground surface. Other embodiments may include other shapes and orientations relative to the ground surface. In preferred implementations, the sliders 16 are loaded upside down in the loading rack 120, such that the legs 52, 54 are over the top member 50. The loading rack 120 can be many types of systems, and in the example embodiment, is a magazine-type rack that receives the sliders 16 from a sorting device (not shown) and continuously supplies the sliders 16 to the insertion pocket 116. The loading rack 120 acts as an accumulator or buffer for the sliders 16 to account for variations in output between the sorting device and the rotor 82. In this embodiment, when the slider 16 drops by gravity from the loading rack 120 into the insertion pocket 116, the slider 16 will be loaded into the insertion pocket 116 so that it is resting on its top member 50 with its legs 52, 54 facing radially outwardly from the rotor 82.
The apparatus 80 further includes a first slider guide 124 and a second slider guide (or guide finger) 126, each being adjacent to the trailing edge 110 of the insertion wedge 104. In the embodiment of
The second slider guide (or guide finger) 126 illustrated in
In the embodiment of
D. Horizontally Oriented Apparatus,
In the
In
The embodiment of
The difference between the embodiment of
E. Example Methods
The principles and devices described above can be used to practice a method of operably mounting a slider onto a recloseable plastic zipper closure having interlocking tracks.
The method includes providing a solid, notchless, recloseable plastic zipper closure with interlocking tracks, in which the tracks have top edges and bottom shoulders. For example, the zipper closure 14 shown in
The method also includes providing a slider having a top member and a pair of spaced legs depending from the top member, in which the legs have opposing hooks. For example, the slider 16 as shown in
In example methods, the step of providing a slider 16 includes providing the slider 16 from a loading rack. For example, the magazine style loading rack 120 can be used. The slider 16 is oriented in the loading rack 120 stacked on top of each other, in which each slider 16 is resting on its top member 50 with the legs 52, 54 extending upwardly from the top member 50.
In methods in which the loading rack 120 is used, the step of providing the slider 16 can include allowing the slider 16 to fall by gravity from the loading rack 120 and into an insertion pocket. For example, the slider 16 can drop by gravity from the loading rack 120 into insertion pocket 116 which is formed by the outer contour or periphery 84 of the rotor 82 and a pair of walls 118 on opposite sides of the rotor 82.
The method includes automatically moving the slider 16 from an initial position toward the zipper closure 14. For example, the slider 16 can be automatically moved from the initial position along a curved path. The curved path can be at least 90° from the initial position to the zipper closure 14. In some methods, the slider 16 is moved along the curved path at least 150 degrees, or at least 180°, from the initial position to the zipper closure 14.
Preferably, the step of automatically moving the slider along the curved path includes moving the slider 16 along a plane vertically oriented relative to a ground surface. For example, in the embodiment of
Alternatively, the step of moving the slider along a curved path can include moving the slider 16 along a plane horizontally relative to a ground surface. For example, in the embodiments of
In preferred implementations, the step of automatically moving the slider 16 includes using a rotating rotor to push the slider 16 from the initial position, along the curved path, to and along the insertion wedge 104 and then onto the zipper closure 14. For example, the rotating rotor 82 can be used to push the slider 16 from the initial position, along the curved path, along the insertion wedge 104, and then onto the zipper closure 14.
Preferably, the step of automatically moving the slider 16 includes pushing the slider 16 with a shoulder on the rotor 82. For example, the rotor 82 can include slider engaging shoulders 86, 88 or slider engaging shoulders 234, 236. One of the shoulders 86, 88 or 234, 236 can push the slider 16 from the insertion pocket 116 and through the curved path to the zipper closure 14.
The method further includes, while moving the slider 16, flexing apart the legs 52, 54 of the slider 16. In example implementations, the step of flexing apart the legs 52, 54 of the slider 16 includes moving the slider 16 along an insertion wedge with the legs of the slider straddling the wedge. For example, the wedge 104 can be used. The slider 16 is moved along the wedge 104 by initially mounting the slider 16 at the leading edge 108 and the legs 52, 54 straddling the wedge 104. The slider 16 is slid along the wedge 104, which increases in thickness from the leading edge 108 until the trailing edge 110.
In accordance with principles of this disclosure, the method further includes, while the legs 52, 54 are flexed apart, mounting the slider 16 onto the zipper closure 15 so that the legs 52, 54 straddle the tracks 36, 38 and the top member 50 is oriented on the top edges 47, 48 of the tracks 36, 38.
In accordance with principles of this disclosure, the method includes allowing the legs, 52, 54 to return to a pre-flexed position so that the hooks 56, 58 on the legs 52, 54 engage the bottom shoulders 60, 62 of the tracks 36, 38. That is, after the slider 16 reaches the trailing edge 110 of the insertion wedge 104, it is moved onto the zipper closure 14, and the legs 52, 54 snap back to their original pre-flexed position to mount the slider 16 onto the zipper closure 14 and be positioned so that the slider 16 can function to interlock and release the profiles 40, 42.
Preferably, the step of mounting the slider 16 includes moving the slider 16 onto the zipper closure 14 under a guide finger to prevent the slider 16 from moving upwardly away from the zipper closure 14. For example, the upper or second slider guide 126 can function as a guide finger, which will prevent the slider 16 from moving away from a remaining portion of the zipper closure 14.
It should be appreciated that the apparatus 80, 180 provides a slider insertion device 81, 181 that is easy to operate in both intermittent and continuous modes. The apparatus 80, 180 does not require costly maintenance to remain in operation. Sliders can be applied to any position on the zipper closure without the need for additional mechanisms by changing the servo timing, speed, and/or position, whether the zipper is moving continuously or intermittently. Sliders can be applied to the zipper closure without cutting or notching the zipper closure. The zipper closure and slider are fully and independently guided/constrained throughout the insertion process. The apparatus 80, 180 does not rely on zipper and slider interference for alignment.
The above represents example principles. Many embodiments can be made utilizing these principles.
