JPH02504381A - film unwinder - Google Patents

Abstract

A film dispenser comprises a holder for a roll (11) of packaging material. The holder is carried by a support (10) which includes a handle (12). A brake roller (13) is carried by the support (10) and engages the peripheral surface of the roll (11). Biasing springs (14) bias the roll (11) and brake roller (13) together whereby a braking force is established on the roll (11) restricting rotation thereof and facilitating stretching of the packaging material when it is withdrawn from the roll (11) and around the brake rollers (13).

Description

[Detailed description of the invention] film unwinder 3 ri 2nd! The present invention relates to packaging, and more particularly to wrapping articles in plastic wrapping materials or relates to a device that facilitates packaging with synthetic plastic bonding materials.

Synthetic plastic material, usually linear polyethylene, with inherent clinging properties The so-called "stretch film 1" is suitable for use on pallets such as bricks and glass containers. Items supported by, packaging for beverages such as beer, newsprint, large rolls of kraft paper For wrapping and packaging many types of items, including bulky and/or heavy items such as has been used for.

Stretch film binds items together as one piece and makes handling them easier. and facilitate transportation. A special machine is used to stretch-wrap these batches of items. machine is being developed.

Background of the invention Frequently, shipping or buying and selling involves pallets of multiple similar or different items. It is preferable to package them together using pallets or without using pallets. for example In fields such as food distribution and hardware supply, several items sold together as a set are It is recommended that the product be packaged in a

Traditionally, in such applications, separate or individually packaged carton or box Many items are made of cellulose tape, bands, cords, tethers, metal or plastic. wrapped together with plastic straps or similar bonding material.

This packaging method is time-consuming, labor-intensive, and relatively expensive. be.

Background technology Several forms of machinery have been proposed to help wrap items in stretch film. came. Australian Patent No. 511,642 describes the use of several layers of film around the load. Discloses an automatic packaging machine for wrapping webs. In this machine, a turntable moves the load into a predetermined position. Holds the load in place and rotates the load against a supported roll of stretch film. Turn around. The brake is applied to the coil to put tension on the film nibs. , the web stretches as the brake is applied to the rotating load. This machine is It is designed for relatively large tubes and is therefore relatively expensive to manufacture.

Australian Patent No. 519,496 describes a method using a similar type of packaging machine. Australian Patent No. 505,121 also discloses that Another form of packaging device is disclosed.

Similarly, U.S. Pat. No. 432,185 all include wrapping multiple packages together or wrapping pallet-supported loads. Another form of stretch wrapping machine is disclosed.

To use such a machine, the load must be brought to the machine, loaded onto it, and changed. The load must be removed in some way while the machine wraps the stretch film around the load. Must be fixed or supported. U.S. Patent No. 4,102,513 describes the Portable handheld unwinder for wrapping rolls of plastic stretch film into Disclose.

The unwinder is equipped with a roll of stretch film and has a single reel assembly. Ru. Second, the two handles support the reel assembly during use. is connected to. The support assembly includes a support shaft. The support shaft is a base play A pair of opposing Supports the rotating end support. Its support is a roll of plastic stretch film. Fit into both ends of the cable. At least one of the supports has a friction block that acts as a brake. Has a rake member to limit the rotation of the stretch film roller on the support shaft . One of the hand grips works in conjunction with the rotating end support to increase the pull on the roll. By increasing or decreasing the tension of the film during packaging. But long However, this unwinder requires both hands to operate and the operator It is necessary to brake the film roll so that it is controlled by.

European Patent No. 0081328 dated November 26, 1982 discloses a film roll Another roller is attached to the roller so that it can swing freely against the roller, and the film passes around a pair of rolls. Disclosed is a film unwinder of the form. The tension applied to the film causes one of the rollers to As a result of the rollers being pressed against the surface of the film roll, one roller rotates at a greater speed than the other roller. That method, the film It is stretched between rollers in the direction of the yam. The unwinder moves around the pallet-supported load. Equipped with a wheeled base. Although this unwinder is portable, it It is necessary to transfer along the floor around the supporting load, and to facilitate this movement - A handle is provided at the top end. Furthermore, the elongation of the film depends on the circumferential speed of the two rollers. 71i1J is controlled by the difference between As soon as the tension on the film decreases, the film The force holding one of the rollers against the surface of the film roll is also reduced, causing that roll to allows unrestricted movement of the rollers and also reduces stretching between the rollers.

Therefore, items can also be packaged, avoiding at least some of the problems with traditional packaging. It would be desirable to provide an improved device for this purpose.

Also, as a packaging material, a plastic film, preferably a linear low-density polyester film, is used. It would be desirable to provide packaging equipment that facilitates the use of ethylene film. stomach.

It is an object of the present invention to be able to operate with one hand while also allowing the user to To provide a portable film unwinder capable of stretch-wrapping articles.

Another object of the invention is to have a relatively simple construction, relatively few moving parts, and It is an object of the present invention to provide a film unwinder that is relatively easy to use.

To provide a film unwinder that can control the elongation of a film in contact with an article as desired. It is also an object of the present invention.

Key points of the invention According to one aspect of the invention, an apparatus for unwinding packaging media is configured such that a roll of packaging media can rotate. holder means for holding the roll so as to hold the roll; and brake means for applying a brake to the roll. For holder means that allow the packaging medium to abut the item or be withdrawn from the roll. supporting means, further comprising at least one braking means for engaging a surface of the roll. Both have one roller means and biasing means for biasing both the roll and the roller means. I can do it.

In one preferred form, the holder means is a hollow member of the roll of plastic media. Opposed journals are provided that are configured to engage opposite ends of the core. different form smell The holder means comprises a mandrel fixed relative to the support means; The roll of plastic material is rotated relative to the mandrel or against a support means. It is mounted on a bearing so that it can rotate.

In a preferred aspect, the packaging medium of a stretchable synthetic plastic material is The device for unwinding from the roll includes holder means for supporting the roll for relative rotation; and a brake means, the support means cooperating with the brake means; The device may be hand-held, wall-mounted, or otherwise positioned for use; Furthermore, the braking means comprises a brake roller supported by the support means, and and at least one of the roll and the brake roller is biased toward the other. As a result, the brake roller engages with the surface of the roll to suppress the rotational movement of the roll. do.

Preferably, the support means is a small piece affixed to or integral with the holder means. Includes at least one handle. In an alternative embodiment, the support means is a wall, A base configured to be secured to a bench, table or other surface is provided.

Preferably, the brake roller is adapted to engage the surface of the roll of plastic material. The biasing spring applies pressure between the rollers and rotates the rolls. A braking force is applied to the roll to suppress rolling. Therefore, the plastic material When the roll is pulled out from the roll, the brake roller suppresses the rotation of the roll. The material is pulled and therefore stretched. The tension and therefore the degree of elongation is It can be adjusted by adjusting the tension of the spring. In one form, the spring is The support means is fixed to a cam lever attached to the support means, and the support means increases or increases the spring tension. is reduced, therefore, applied to the roll of plastic material by the brake roller It is movable to vary the pressure applied.

While varying the biasing force, a roughly constant force is reliably applied regardless of the roll diameter. Other means may be used as described.

In one form of the invention, the device includes holes or lugs spaced from the roll and braking means. A. Passing the plastic material from the roll through holes or runners The material is thus formed into a strand similar to a cord or the like. In another form, the ratio Use relatively thin materials to form bands suitable for tying or tying items together. The plastic material passes through the folding or strapping device so that I am forced to do it.

In a preferred embodiment of the invention, the device collects plastic when it is pulled from the roll. and a cutting means that can be used to cut the material.

In one form, the cutting means comprises a blade mounted on the support means.

In another form, the cutting means is movable coaxially with respect to the roll and A cutter is provided which is engageable with the plastic material in the vicinity of the key means. Yet another implementation In the example, the cutter means is preferably arranged generally parallel to the roll surface and parallel to the roll surface. extending away from the roll surface and with the plastic material drawn from the roll. Equipped with a removable serrated blade.

In use of the apparatus of the invention, a roll on a roll is mounted for rotation on the holder means. an edge of the plastic stretch wrap material is brought into contact with the item to be wrapped; The device and item are held in place during separation and movement. With that movement, plus The tick material is stretched and wrapped around the item at the same time. The tension within the film is specified When the minimum value of is reached, sufficient force is applied to stretch the film and at the same time brake Overcoming the action of the means, the film is drawn from the roll.

Straight polyethylene film can be up to several times its original length, depending on its application. Can be expanded. Due to the inherent elasticity of some types of film, it is difficult to stretch. The film tends to return to its unstretched dimensions or condition; It applies pressure to the wrapped item to firmly hold it.

According to another aspect of the invention, a film unwinder includes a housing and a hub for the housing. means for supporting the ends of the core tube to which the roll of packaging material is attached. A pair of opposing guide passages provided in the housing and a core tube connected to the housing biasing means acting on the core tube to bias the core tube toward the front of the housing; A brake roller is rotatably installed in the ring and can freely engage with the roll. In addition, the roll is freely movable with respect to the housing.

If desired, the unwinder can be wall mounted with the same features as described above. It may also be configured as a stretch film unwinder.

In order that the invention may be easily understood, reference is made to the accompanying drawings, in which embodiments thereof are shown by way of example only. , as explained below.

Drawing description FIG. 1 is a side schematic perspective view of the first embodiment of the invention, and FIG. 2 is a side view of the mandrel. 3 is a plan view of the second embodiment, and FIG. 4 is a plan view of another embodiment. FIG. 5 is a perspective view showing another embodiment of the invention; FIG. is a partially cutaway plan view of the unwinder of FIG. 5, and FIG. 7 is a partially cutaway plan view of the unwinder of FIG. FIG. 8 shows a modified structure of the brake roller.

Description of the preferred embodiment FIG. 1 shows a stretch film unwinder that can be operated with one hand.

The device of this embodiment rotates within the frame 10, as will be described later with reference to FIG. The mandrel 8 is provided with a mandrel 8 which is supported so that the mandrel 8 is rotated. The mandrel is made of stretch film. It is configured so that the hollow core of the roll 11 can be inserted therethrough.

At the end of the frame 10 farthest from the roll 11 and mandrel 8, a handle or hook is attached. A hand grip 12 is provided. The unwinder is preferably a rough-skinned rubber roller. It has a brake roller 13 which is .

The brake roller 13 is supported by the arm 6 and moves within the groove 7. The spindle end 16 has a flexible spindle end 16. The roller 13 is approximately constant with respect to the roll 11. is biased by a spring 14 so as to maintain a braking force of . This block The rake force is used to stretch the film on roll 1 to an appropriate degree when the device is used. is sufficient to do so. One end of each biasing pin 2214 is inserted into the hole 15 on the side of the frame lO. The other end is fixed to the spindle 16 of the brake roller 13.

Alternatively, a compression spring means is used to force the brake roller onto the stretch film roll. It is possible to ensure the necessary degree of deflection for the Ideally, multiple Adjustment means, such as holes 15, may be provided in various embodiments of the invention to adjust the adjustments will be made.

In FIG. 2, a nested mandrel 8 is shown.

An inner member 18 having a head 19 of the same diameter as the barrel 17 fits within the barrel 17. It has been paid. At the end of the barrel 17 remote from the head 19, a compression spring ( (not shown) is located in the barrel 17, and the insertion portion 20 is inserted into the corresponding socket of the frame 10. bias. A detent or step 21 operates in a groove 22 in the barrel 17 to This prevents the side member 18 from falling off the barrel 17. In use, the barrel 17 and the inner member 18 to move the insertion part 20 backward from the socket of the frame 10. By retracting, the mandrel 8 is easily removed from the housing 10. teenager Instead, the handle 12 is provided with an interengaging socket and spigot to allow the handle to The mandrel 8 may be reached by being removable. .

FIG. 3 is a plan view of another embodiment of the invention. In this example, Fig. 2 shows It may be similar to that shown or it may be fixed within the frame 23. The mandrel is inserted through the hollow core of the roll 11 of stretch film 24. There is.

The frame 23 has a handle or hand grip 2.5 and is biased towards the unwinder. A brake roller 26 is provided. The brake roller 26 has a pair of holes 28 supported by a wire frame 35 held on frame 23 by . A torsion spring 27 integral with the frame 35 applies a biasing force to the brake roller 26. Ru.

In FIG. 4, another embodiment of a hand-held unwinder 31 is shown and is made of cardboard or other material. A plastic film is unwound from a roll 32 that is wound around a core 30 of material. Ko The frame 30 is supported by insertion portions 33 and 34 integral with frame side members 36 and 37, respectively. held. The frame side member 36 extends approximately coaxially with the insertion portions 33 and 34. It has an integral handle 38. The handle 38 has an enlarged bulbous portion 39 at its free end. has. The enlarged spherical portion 39 snaps into a socket 41 formed in the side member 37. The frame members are snap-fitted to hold the frame members together.

Roller 42, which is preferably made of rubber compound or the like, is supported by springs 43 and 44. It is supported and engages the surface of the film roll 32.

Springs 43 and 44 are tension springs located within frame side members 36 and 37, respectively. It is fixed to adjustment members 46 and 47. Each adjustment member is connected to each frame side member 36. ．． 37 and can be engaged with one of the plurality of seats 51 disposed on the side wall of the groove 52 formed in the groove 37. The fins have a value of 48.49.

The frame side member 36 is fixed to the frame side member 36 and has a guard. It has a cutting blade 53 protected by 54. The guard 54 has a film in contact with the blade 53. while allowing users to avoid inadvertent contact.

Films of plastic material can be used as bands, cords or strings in some applications. It may be formed into For this purpose, the wire is spaced apart from the roller 42. A small hole 56 is provided in the unwinder 31 and is supported by a support 57 or the like.

When the plastic film passes through the small hole 56, the tension acting on the film and its The structure of the holes along with the inherent sticking properties make the film extremely strong in the form of a string. take the form.

In FIGS. 5, 6, 7, and 8, the unwinder of this embodiment is made of synthetic plastic. It includes a housing 62 molded from a stick material.

The housing 62 has a front portion 63 and a rear portion 64 that pivot together about an axis 66. . As shown in FIG. 6, the clip 67 holds the two housing parts in operable position. hold

A pair of guide passages 6 on both sides of the housing are capable of receiving both ends of the film roll core. 8 and a roll 11 of film material movable along a guide path 68. A core chineave 69 that allows rotation is provided.

The rear housing part 64 is formed with an integral handle 71, while the front housing part 64 is formed with an integral handle 71. The ring portion 63 supports the brake roller 72. The brake roller 72 has a front portion 63 a spindle 73 attached to the A roughly rigid PVC roller rotatably attached to the senior 4 and the bearing pusher 74. 76.

A pair of bias springs 78 are mounted on a journal 79 coaxial with the swing axis 66. . One leg 81 of each spring 78 is supported by a bar 82 in the rear housing part 64. The other leg 83 of each biasing spring 78 is supported within the guide passage 68. It abuts against the core chineave 69. In this way, the biasing spring 78 biasing the tube 69 and thus the roll 11 towards the brake roller 72. for use , the film material is produced by the engagement of the roll 11 and the brake roller 72. from the roll 11 through the nip where the material is wrapped with stretch film material. It is brought into contact with an item or a group of items. Applied by brake roller 72 The braking force applied causes the film to stretch as it comes into contact with the item. The extent of the extension depends on the biasing force and rotational freedom of the brake roller 72. .

By passing the stretch film through the nip, the material is always tightly rolled. 11 and can maintain constant tension during packaging.

In FIG. 8, the biasing roller 72 has a rotational degree of freedom of the brake roller 72 during use. It has a built-in clutch mechanism that can be adjusted to vary the Shown in Figure 8 This structure includes a pair of flanges configured to engage both ends of the brake roller 72. 86 and 87.

Flanges 86 and 87 have a spring 88 and a threaded spout connected to handle 91. held together by handles 89. For threading the handle 91 and spindle 89 By adjusting the axial position of the spindle 89, the tension of the spring 88 can be changed. The flanges 86 and 87 vary the pressure acting on both ends of the brake roller. This changes the rotational degree of freedom of the brake roller.

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Claims (19)

[Claims] 1. holder means for holding the roll of packaging medium so that the roll can be rotated; braking means applied to the roll and a holder that allows the packaging medium to be retracted from the roll. support means for the roll means, further comprising: a braking means for engaging a surface of the roll; at least one roller means for biasing the roller means and the roll together; An unwinder for unwinding a packaging medium from a roll, the unwinding device comprising a gripping means. 2. The holder means includes a mandrel rotatably supported by the support means. An unwinder according to claim 1. 3. The holder means engages and rotates freely against the ends of the core of the roll of packaging medium. 2. An unwinder according to claim 1, further comprising opposing journals that are supported at the same time. 4. A claim in which the support means has a handle extending substantially parallel to the axis of the roll. The unwinder according to any one of the ranges 1 to 3. 5. the roller means comprises a cylindrical roller mounted on the support means; The gripping means acts on the roll or the brake roller to loosen the surface of the roller and the roll. Any one of claims 1 to 4, comprising one or more springs that engage the surfaces. The unwinding means described in . 6. When retracting from the roll, the packaging medium passes through the nip between the roller and the roll. The unwinder according to claim 5, wherein the unwinder moves around a brake roller. 7. The roller means includes integral clutch means for controlling the braking force to the brake means. An unwinder according to any one of claims 1 to 6. 8. 8. An unwinder according to claim 7, wherein the clutch means is adjustable. 9. The roller means is supported on a pair of arms extending from the support means. The roller has a groove, and both ends of the roller are inserted into the groove so as to slide along the groove. , further comprising a pair of biasing means extending from the support means and engaging opposite ends of the roller. An unwinder according to any one of claims 1 to 8, comprising a spring. 10. the support means comprises a housing, and the holder means is formed on the housing; The unwinder according to any one of claims 1 to 9, comprising a guide passage with a . 11. A brake roller means is rotatably mounted to the housing and also brakes the packaging medium. The roll is supported on a core tube rotatably supported within the guide passage. The unwinder according to item 10. 12. The biasing means includes a pair of spring members having opposed legs, one of each spring member one leg is supported by the housing, and the other leg is supported by the end of the core tube. as claimed in claim 11, engaging the roller to bias the roll towards the brake roller. Unwinder. 13. The housing is composed of two members that swing together and a claim movable between an open position and a closed position in which the roll of packaging medium can be reached; The unwinder according to any one of the ranges 10 to 12. 14. According to any one of claims 1 to 13, wherein the biasing means is adjustable. Unwinder. 15. A housing, a handle means for the housing and a roll of packaging material are attached. A pair of opposing core tubes are provided in the housing to support both ends of the core tube. a guide passageway and a core tube to bias the core tube toward the front of the housing; a biasing means acting on the tube and rotatably mounted within the housing; is equipped with a roll of packaging material and an engageable brake roller, and the roll is connected to the housing. A film unwinder that can be rotated freely relative to the ring. 16. The above brake roller is integral and adjustable to suppress the rotation of the roller. 16. An unwinder according to claim 15, comprising a clutch means. 17. The clutch means includes at least one member in frictional engagement with the end of the brake roller. A claim comprising an end flange and biasing means for biasing the flange toward the end thereof. The unwinder according to item 16. 18. Claim 17, wherein the pair of flanges engages both ends of the brake roller. Unwinder as described. 19. Claim 1, wherein the packaging material is a stretchable synthetic plastic film. Unwinder.