Patent Grant
11426902
The present invention relates to an apparatus and method for the stripping of elastomeric gloves from a dip-moulding former, when the gloves have already been partially stripped such that each glove has a downwardly hanging cuff end portion with a terminal beaded cuff end. The invention particularly relates to the stripping and subsequent handling of dip-moulded disposable inspection gloves such as those used in clinical, veterinary, dental or medical environments or in other situations where hygiene is important, such as food preparation.
There is an increasing need to control infection of patients in hospitals, clinics, and doctors' surgeries from infectious bacteria resistant to multiple antibiotics, in particular methicillin-resistant Staphylococcus aureus (MRSA). Research has also shown that if someone has MRSA on their hands, the bacteria would be left on the next four surfaces touched by that person. Once MRSA is on an item it will remain there for up to 80 days unless that item is cleaned. C. difficile will remain active on surfaces much longer than that. One effective and inexpensive way to control such contamination is the use of disposable inspection gloves.
Examples of manual and automatic production systems for packing such gloves into a box or dispenser are disclosed in patent documents WO 2010/020782 A2 and WO 2011/048414 A1. Such systems work most effectively when gloves are presented to a packing station in a predictable or regular manner by a conveyor.
In such production systems, whether for gloves or other products that are similarly flexible and relatively flat, it can be very useful to transport products on a conveyor, for example a belt conveyor.
Dip-moulded gloves are produced on a mould or tool, referred to herein as a “former”, having a particular shape. The former is dipped into a liquid bath and then raised out of the bath and heated, dried or cured in order to remove solvent from the liquid clinging to the former or to cross-link polymer chains, and so leave a solid film on the former. In this description, the resulting film is referred to as having been “cured”.
Disposable inspection gloves are increasingly made from nitrile butadiene rubber, referred to herein simply as nitrile, owing to its relatively low cost, good flexibility and elasticity and non-allergenic properties. Such gloves are formed on a former that is hand-shaped with a cuff portion and with a digit portion at the end, the digit portion being oriented lowermost when dipped into and raised from a tank of liquid. A production plant will have a long continuous chain conveyor which transports the formers through the various production steps, which will include a stripping step in which the cured glove is stripped off the former inside out. Following this, the empty former is checked for any residues and cleaned, which can include dipping in an acid bath.
A glove manufacturing line will normally have two pairs of such chain conveyors, making four parallel lines, passing through the same tanks, and stripping and inspection stages. Production speeds are of the order of about one glove per second per line.
Stripping gloves off formers normally involves manual labour, at least in part of the stripping process. The process can be partly automated by using a glove stripping machine that pulls most of the glove off the former, such that a palm portion and a cuff end of the glove hangs downwards from the parts of the glove still in contact with the former, including the former digit tips. The gloves are provided with a reinforcing bead or rim at a cuff end. When partly stripped from the former, the glove cuff end hangs downwardly from the former digits.
At typical glove dip-moulding production speeds, there is normally the need for two, three or four workers per line. The free-hanging glove cuffs are normally pulled by workers to peel the glove digits completely off the former, after which each glove is dropped in a box or placed on a growing pile at the glove stripping station.
The cost of labour is an increasing component of the total cost of production. Therefore, machines are known for the final full stripping of gloves from a former. However, the issue is not just the labour required at the stripping station, but also the labour needed to handle gloves after these are removed from the stripping station for packing into boxes or dispensers.
Utility Model document CN 202439169 U discloses a machine for automatically stripping gloves from a dip-moulding former and placing the stripped gloves, one at a time, on a receiving surface to form a stack of gloves. Gloves are partially stripped from the former prior to reaching the machine which has a pair of opposed rollers. The rollers grip a cuff end of the glove which is then peeled off the former cuff-first so that the peeled glove is inside out relative to the formed glove. A limitation of machines such as this is that the stack of gloves which is formed beneath the pair of rollers is very uneven. Although workers can be employed to tidy and align each stack of gloves produced by the machine, the gloves still do not lie evenly flat within the stack, which makes further processing and packing that much more difficult to implement. The unevenness also significantly limits the maximum number of gloves that can be packaged in a glove dispenser.
Patent document WO 2014/122595 A1 discloses another way of stripping partially stripped elastomeric gloves from a dip-moulding former using a pair of opposed belt conveyors in a V-configuration which can be pivoted together to grip a cuff end portion. The belts are then activated to pull the cuff end and fully strip the glove from the former. Following this, the opposed belts can be moved into position for discharging the glove onto a conveyor belt by again activating the belt conveyors. Whilst this system is effective in providing a mechanised process for stripping gloves and then depositing gloves on a conveyor belt, the apparatus is relatively complex and heavy, which makes it more difficult to achieve a cycle time fast enough to match the speed of the glove production line. Furthermore, the position of the deposited cuff ends on the conveyor belt will vary in dependence on variations in how far the cuff end portion hangs downwardly from the former. This in turn places more demands on automatic glove packing equipment used to pick gloves from the conveyor belt and to pack gloves into dispensing containers.
It is an object of the present invention to provide a more convenient apparatus and method for stripping elastomeric gloves off a former in a dip-moulding process.
According to a first aspect of the invention there is provided a glove stripping apparatus for fully stripping from a series of dip moulding formers a corresponding series of partially stripped elastomeric dip-moulded gloves each having a downwardly hanging cuff end portion of said glove, each of said cuff end portions having opposite first and second sides and being terminated at a beaded cuff end, the apparatus comprising:
wherein the actuation system is configured to use the gripping members to grip said cuff end portion and then to move the gripper in said open space substantially horizontally in said first direction during said stripping thereby pulling said first side against said abutment so that a first stripped portion of said glove extends generally sideways between the gripping members and said abutment, and a second stripped portion of said glove extends generally upwards between the abutment and said former, until said glove is fully stripped by said substantially horizontal movement of said gripper.
The gripping members may be configured to grip the cuff end portions of just one glove at a time, but in a preferred embodiment of the invention, the gripping members are elongate in the direction of the line of formers on the production line and are configured to grip a plurality of cuff end portions from corresponding formers so that multiple gloves may be stripped in one operation of the grippers.
In general, the first gripping member and a second gripping member will have corresponding first and second gripping surfaces facing each other across a gap that extends along a second direction. The second direction may be parallel with a line of formers on the dip-moulded glove production line. In this case, the glove first and second sides will be laterally outward sides relative to the direction of motion of the formers on the production line.
The first direction may be substantially perpendicular to the second direction.
During stripping of the glove, the abutment thereby restricts further movement in the first direction of the second stripped portion of the partially glove extending between the abutment and the former. The substantially horizontal movement of the gripping members will result in the gripping members moving away from the former. As the glove is of elastomeric material, the first and second stripped portions of the glove will be stretched between the gripping members and the abutment and between the abutment and the former.
The substantially horizontal movement may have some downward component as long as the movement causes the first side to come up against the abutment.
The abutment may present a bearing surface to the first side of the hanging cuff end portion, this bearing surface being adapted not to bind with movement of the first and second stripped portions during stripping of the glove.
The bearing surface may be any of: a smooth non-rotating surface; a roller bearing surface; or an air bearing surface.
Preferably, the bearing surface is convex between the first and second stripped portions. The abutment is preferably fixed, i.e. the abutment does not move during stripping of the glove.
The abutment is preferably elongate and substantially parallel with the first side of the cuff end portion. As the first and second sides of the former will most usually be oriented parallel with a line of movement of a series of formers on a production line, at least when it is time to strip the partially stripped gloves, the abutment will normally be substantially parallel with the line of movement of the formers on the production line.
At least one of the first and second gripping members may be moveable relative to the other one of the gripping members for releasing the opposite first and second sides after the glove has been fully stripped. The actuation system may also comprise at least one actuator for driving movement of at least one of the first and second gripping members during release of the cuff end portion. Therefore, the actuation system may be configured to use the gripping members to release the cuff end portion after the glove has been fully stripped.
The horizontal movement of the gripping members in the first direction will then pull a finger portion of the glove downwards and around the abutment so that the entire glove is automatically rotated from the substantially vertical orientation on the former to a substantially horizontal orientation ready for depositing.
Prior to depositing, the gripping members open sufficiently to release the glove cuff end portion, which is pulled free from between the gripping members by friction as the glove finger portions are dragged across a surface on which the glove is to be deposited by the substantially horizontal movement of the gripping members.
During this process, it is advantageous if a blast of air is directed substantially downwardly at the finger portions. This helps to flatten the finger portions onto the surface on which the glove is to be deposited, following which, the cuff beaded end is pulled free from between the open gripping members.
For the avoidance of doubt, the term “finger portion” includes a thumb portion of the glove.
The apparatus will, therefore, in general be used in a cyclic manner, and after deposition of the fully stripped gloves the actuation system will move the gripping members back into an initial or starting position from which the next glove, or the next set of gloves, can be stripped from the formers.
The apparatus may comprise a glove deposition surface for receiving the released stripped gloves. The open space in which the first and second gripping members move substantially horizontally then preferably extends between the glove deposition surface and the abutment.
The movement of the first and second gripping members may have some downward component during stripping of the glove is that this will bring the first and second gripping members, and hence the cuff end of the glove held by the gripping members, closer to the glove deposition surface prior to release of the glove by the gripping members. An advantage of this is that it reduces the distance the glove has to drop when released, thereby helping to avoid creases such that the glove is deposited in a substantially flat orientation.
The apparatus may comprise a conveyor belt for conveying stripped gloves away from the gripper, the deposition surface being provided by a conveying surface of the conveyor belt.
Preferably, the first gripping member has a first gripping surface extending in a substantially horizontal direction for gripping the first side of at least one of the cuff end portions.
Preferably, the second gripping member has a second gripping surface extending in a substantially horizontal direction for gripping the second side of at least one of the cuff end portions during stripping of the gloves. The gripping members may then be oriented with respect to each other such that the first and second gripping surfaces face each other across the gap.
At least one of the first and second gripping surfaces may be convex, whereby a void is provided beneath the gap so that, in use, the beaded cuff end and adjacent cuff end portion are able to hang downwardly from the gap into the void.
The gripping members preferably grip the cuff end portion by relative movement of the first and second gripping members towards one another to narrow the distance across the gap, whereby the first and second gripping members are movable between:
(i) an open configuration for receiving in the gap the cuff end portion whereby the cuff end portion extends above and below the gap with the beaded cuff end located in the void beneath the gap; and
(ii) a closed configuration in which the gap is narrowed sufficiently to block passage through the narrowed gap of the beaded cuff end but is not narrowed enough to hinder movement of the cuff end portion, so that during the stripping the cuff end portion is able to move in the gap until the beaded cuff end is caught by the narrowed gap.
This feature, in which the beaded cuff end is automatically lodged in the narrowed gap, therefore automatically aligns the beaded end of the stripped glove with respect the first and second gripping members prior to the glove gripper delivering the glove to the next processing stage, with the result that the glove can be delivered to the next processing stage in a predetermined and well-defined physical orientation.
The gap may extend along a second direction, the second direction being transverse relative to the first direction. Preferably, the abutment also extends substantially parallel with the second direction.
The first and second gripping members are preferably elongate on opposite sides of the gap.
In a preferred embodiment of the invention, the movement of the first and second gripping members to close the gap is in a substantially horizontal direction that is transverse to the second direction.
The void can be any convenient or practicable size or volume of open space and at a minimum need have a volume large enough just to accommodate the cuff end portion beneath the gap and a width sufficiently greater than the narrowed gap so that the cuff end portion is free to move in the void without the beaded cuff end becoming trapped or caught in the open space.
When the gap is widened to receive a cuff end portion, the gap has a first width and when the gap is narrowed to restrain a cuff end portion it has a second width. Preferably, the first width is at least 50 mm, and most preferably at least 100 mm so that a cuff end can be received in between the gripping members without interference from the gripping members
Preferably the second width is no more than about 2 mm, and most preferably no more than about 0.75 mm. Preferably, the gap between the opposed gripping surfaces having the first width extends in a substantially horizontal direction.
Preferably, the gripping surfaces when moved relatively together present a downwardly opening funnel for channelling the beaded cuff ends into the constricted gap.
In the context of the present invention, a dip-moulded glove will be partially stripped from the former if one or more digits (fingers and/or thumb) of the dip-moulded glove are remaining, fully or partially, on the former, with the cuff end portion hanging freely downwards from the former, with an open end of the glove having a beaded cuff end and being lowermost.
Depending on the grade of glove, the material thickness of the cuff end portion will be between about 2 to 15 mils (50 μm to 375 μm). The beaded cuff end will normally be at least twice this thickness and is more commonly ten times this thickness. Many nitrile gloves are about 4.5 mil thickness (115 μm). The narrowed gap between the opposed surfaces will be sized to accommodate least double this thickness but be less than the thickness of twice the expected beaded cuff end thickness. For example, if the beaded cuff has a thickness of 20 mil (500 μm), then the narrowed gap should be no more than about 40 mil (1 mm).
The cuff end portion is therefore restrained such that the cuff end portion can move relatively upwards as the narrowed gap moves downwards towards the beaded cuff end.
Therefore, in general, the cuff end portion adjacent the beaded cuff end will have a first material thickness and the beaded end will have a second material thickness, the first thickness being less than the second thickness. The first material thickness is therefore less than or approximately equal to the narrowed gap second width and the narrowed gap second width is also less than about double the second material thickness of the beaded end, so that the beaded cuff end is caught by the narrowed gap, at least where the beaded thickness is doubled where the left and right sides of the cuff end fold back on itself.
It is preferred if at least the second gripping member is a rod. In a preferred embodiment, both the first and second gripping members are rods. In general, at least one of the gripping members will be moveable relatively apart with respect to the other one of the members for receiving the downwardly hanging cuff end. The gripper may then be movable towards a line of the formers in a third direction during receiving of the cuff end portion. This third direction is substantially opposite to the first direction.
Preferably, at least one actuator of the actuation system is configured to drive these movements apart and in the third direction prior to receiving of the cuff end portion between the first and second gripping members. The controller may then be arranged to control these movements apart and in the third direction during receiving of the cuff end portion.
The movement in the third direction is in a substantially horizontal direction during which the second gripping member is moved into contact with the first side of the downwardly hanging cuff end portion until the beaded cuff end rides over the second gripping member and into the gap between the first and second gripping members.
The first and second gripping members may be constrained to move in a substantially horizontal direction, and the actuation system comprises at least one actuator for driving movement of at least one of the first and second gripping members relatively apart from one another
According to a second aspect of the invention, there is provided a production line for producing a plurality of elastomeric dip-moulded gloves, the production line comprising:
Preferably, the actuator system is configured to:
According to a third aspect of the invention, there is provided a production line for producing a plurality of elastomeric dip-moulded gloves, the production line comprising:
The production line may further comprise a conveying surface for conveying stripped gloves away from the glove stripping apparatus, wherein the glove stripping apparatus is configured to repeatedly strip gloves from the formers and to deposit the stripped gloves on the conveying surface.
According to a fourth aspect of the invention, there is provided a method for fully stripping gloves from dip-moulding formers using a glove stripping apparatus when said gloves have already been partially stripped, each of said partially stripped gloves having a cuff end portion terminated with a beaded cuff end hanging downwardly from a corresponding one of said formers, the beaded cuff end being of thicker material than that of the cuff end portion, and the apparatus comprising an abutment proximate a first side of said downwardly hanging cuff end portion and a gripping device relatively movable with respect to said downwardly hanging cuff end portion, an open space extending beneath said abutment, said open space extending in a first direction away from a first side of said downwardly hanging cuff end portion, and the gripping device comprising at least two gripping members including a first gripping member and a second gripping member, said gripping members having respective opposed first and second gripping surfaces and being movable relative to each other, the method comprising the steps of:
The width of the narrowed gap between the opposed gripping surfaces is such that the cuff end portion but not the beaded cuff end is free to move within the gap so that the restrained cuff end portion moves towards the narrowed gap as the first stripped portion of the glove is pulled generally sideways until the beaded cuff end is lodged in the narrowed gap.
The method may comprise, after the glove has been fully stripped, the step of moving apart the first gripping member and the second gripping member to release the stripped glove in a substantially horizontal orientation onto a glove deposition surface.
A particular advantage of the invention is that generally downward movement of the glove as this is being stripping from the former is translated into generally horizontal movement by the abutment.
To achieve this effect, the abutment preferably changes the direction in which the glove is pulled by between about 45° and 90°, and most preferably between about 60° and 80°.
Preferably, prior to receiving in the gap between the opposed gripping surfaces the downwardly hanging cuff end portion, the method comprises:
According to a fifth aspect of the invention, there is provided a production line process for producing plurality of elastomeric dip-moulded gloves, each glove having a digit portion and a cuff end portion, said cuff end portion terminating at a beaded cuff end, the production line comprising a plurality of dip-moulding formers on a conveying apparatus, a dip-moulding stage, a partial glove stripping stage and a full glove stripping stage, the process comprising using the conveying apparatus to move the dip-moulding formers sequentially through:
The production line may further comprise a conveying apparatus for transporting the formers from the dip-moulding stage to the glove stripping apparatus and a conveying surface for conveying stripped gloves away from the glove stripping apparatus. The glove stripping apparatus may then be configured to repeatedly strip gloves from the formers and to deposit the stripped gloves on the conveyor.
The invention will now be further described, by way of example only and with reference to the accompanying drawings, in which:
The gloves 2 are made from an elastomeric material, and in this example are disposable nitrile inspection gloves for use in medical, dental, veterinary or food preparation applications, however, the principles of the invention are applicable to other types of dip-moulded gloves of a similar thin, flexible and elastomeric material and having a beaded end 3. The gloves are formed on dip-moulding formers 4 using production processes which will be familiar to those skilled in the art. In this example, there are two parallel tracks 6, 6′ each of which carries a chain (not shown) from which hangs a regularly spaced series of mounts 8, one for each former. Each line of formers 4 moves at a steady forward speed 99.
The movement of the formers 4 along the tracks defines a horizontal longitudinal direction and at right angles to this a horizontal transverse direction. In
The formers 4 pass through a number of previous process stages prior to reaching the glove stripping apparatus of the invention, and these previous process stages are all well known in the art. The main stages include a dip clean stage 11 in which formers are dipped in an acid bath so that the formers are cleaned of all residues. The cleaned formers then pass to a dip-coating stage 12, followed by a curing stage 13 to form a glove 2 on each former 4. Together, the cleaning, dip-coating and curing stages can be said to provide a dip-moulding stage.
Following the dip-moulding stage, the gloves' cuff ends are rolled back in a first part of a partial glove stripping stage 14 to provide the beaded end 3 at a terminal end opening 5 of each glove 2. Because the beaded end is formed of a rolled up portion of glove material, the beaded end is thicker than an adjacent cuff portion 10 of the glove. The bead 3 provides mechanical strength to the cuff terminal end 5 in use, but is also helpful when the glove is then to be partially stripped from the former 4.
As shown in
The finger portion or digit portion 7 of the glove consists of four glove fingers 17 and one glove thumb 19. Preferably, these portions are symmetrical between opposite first 9 and second 9′ glove sides (see
The partial glove stripping station or stage 14 is then followed by a full glove stripping station or stage 15, preferred embodiments of which are described in detail below. In known production systems, this stage is often a manual process where workers manually pull and strip the gloves from the formers 4. Alternatively, it is known to use a pair of oppositely rotating rollers or belts having a pair of opposed rolling surfaces which firmly grip therebetween the cuff end portion 10 and pull the glove fully from the former and eject the glove in a downwards direction. The ejected glove then falls, for example, on a roughly formed growing pile of gloves directly beneath each pair of rollers, such as described in CN 202439169 U or onto a moving belt conveyor as described in WO 2014/122595 A1. Such known production systems grip the downwardly hanging cuff portion 10 wherever this happens to be, in the vertical z-axis direction, with a consequent variation in the location or timing of eventual ejection of the glove from the rotating rollers or belts.
As can be seen from
Another consequence of the unevenness of partial stripping is that it is difficult in known full stripping processes to ensure a regular placement of the fully stripped glove in the location where the glove is deposited, for example a static, growing pile of gloves or a moving conveyor belt.
An associated controller 50 (
There are limits to the speed of movement of the stripping apparatus, and therefore, for the sake of efficiency, each gripping device 25 is preferably configured to strip gloves 2 from just one of the two dip-moulding production line tracks 6, 6′, rather than from both. Other types of glove stripping apparatus, for example, as described in WO 2016/139640 A1, may need more than one gripping device for each production line track. The illustrated example is, however, capable of stripping every glove from one production line in two variations of operation, one of which is shown in
In both examples, the illustrated gripping device 25 is capable of stripping and depositing two adjacent gloves at the same time every 0.86 s. Current production lines for dip-moulded gloves typically produce up to about 10,000 gloves per hour per track, which equates to the dip-moulding formers 4 moving along each track 6, 6′ at a speed of one glove every 0.36 s. With a glove spacing centre-to-centre of 200 mm, the typical track speed is up to about 1.8 m/s. Therefore, at this line speed, a glove stripping apparatus having a cycle time of 0.86 s and having a single gripping device as illustrated is capable of stripping every glove, and so in practice the apparatus has 0.14 s spare in its cycle time. It is, of course, possible to reduce the cycle time with the use of lighter-weight materials or more powerful motors driving the stripping actuator. However, a single gripping device will be less expensive than several, even if one controller is used to control both, and so if it were necessary to increase throughput, then the apparatus could be modified by increasing the length of the first and second gripping members, also referred to herein as grippers, so that more than two gloves are stripped at the same time. The skilled person will appreciate that the principles of the invention are equally applicable to gripping devices having gripping members 24, 26 of lengths different to those illustrated, and may be employed to strip just one glove at a time.
The gripping device 25 has, in this example two gripping members, namely a first gripping member 24, and a second gripping member 26 which are movable relative to each other in the transverse or y-direction. Each gripping member 24, 26 extends substantially horizontally in the longitudinal or x-direction and each is preferably at substantially the same level as the other. The gripping members are also preferably straight and parallel with respect to each other and also preferably substantially parallel with the longitudinal direction of movement along the x-axis of the formers 4 along the production line tracks 6, 6′. As shown in the drawings, the gripping members are thus separated in the transverse y-axis direction by a clear gap of varying widths 40, 40′, 40″, the size of the gap being the distance across the gap where the separation between the first and second gripping members is at a minimum. In this example, the gap is a slot between the two gripping members. Each gripping member 24, 26 provides a corresponding gripping surface 34, 36 that is inwardly directed across the gap 40, 40′, 40″ towards the other gripping surface. When the gripping members are moved to an open configuration in which these members are relatively far apart, the gap has a first width 40 and when the gripping members are moved to a narrowed or constricted configuration in which these members are relatively closer together, the gap has a second width 40′. The second width is therefore less than the first width.
Beneath the gap is an open space or void 35. The open space extends beneath the gripping surfaces along the full longitudinal length of the opened gap 40. The opened gap therefore presents an upwardly facing opening for receiving between the gripping surfaces 34, 36 and within the open space 35 the downwardly hanging cuff end portion 10. In this example, there are just two gripping members, each of which extends continuously on either side of the opened gap 40 for gripping two gloves at a time. It would, however, be possible to provide a greater number of gripping members, for example several separate gripping members spaced apart in the longitudinal direction, or alternatively extend the length of each gripping member if more gloves were to be gripped at a time.
The first and second gripping members 24, 26 are relatively movable with respect to each other so that the gap may be either narrowed 40′ or opened up 40. In this example, the first gripping member is mounted to a first supporting arm 21 affixed to a linearly movable first carriage 27 which slides horizontally in the y-direction on a first track 28. The second gripping member 26 is mounted to a second supporting arm 22 affixed to a linearly movable second carriage 29 which slides horizontally in the y-direction on a second track 30. Both tracks 29, 30 are affixed to a movable support which is itself slideable horizontally in the x-direction.
In this embodiment, the gripping members are not movable in the z-direction, and so the movement is confined to a horizontal plane. It would, however, be possible to add an extra degree of freedom of movement to the gripping members, for example, either by raising and lowering the entire assembly on which the gripping members are supported or by pivoting the supporting assembly about a longitudinal axis. As opposed to a 3-axis actuator, for example as disclosed in WO 2016/139640 A1, this greatly simplifies the construction of the glove stripping apparatus. This does mean, however, since in general it would be difficult to provide machinery to controllably move the formers 4 along the z-axis, that the downwardly hanging open cuff ends must enter into the gap in a horizontal direction relative to the first and second gripping members. The alternative variations of operation explained below illustrate two ways of doing this.
The opened gap 40 extends longitudinally from the carriages 27, 28 and tracks 29, 30 and in one embodiment presents an open end 41 (
In
It should be noted, however, that these two ways of admitting glove cuff ends between the opened gripping surfaces are not mutually exclusive, and could be used in combination. For example, the gripping members could move towards the line of downwardly hanging cuff ends before all cuff ends are aligned longitudinally with the gripping members. Then, when moving transversely, the second gripping member 26 may press up against just one glove, (or two gloves if three gloves are being removed at a time, instead of just two, as in the present example). The next glove would initially be outside the longitudinal reach of the gripping members. The gripping members would then be held in position until the next glove cuff end had moved into position between the gripping members, following which the members would move until the gap was in the narrowed configuration 40′.
The gripping members 24, 26 are convex in a transverse plane extending above and below the gap. In this example, these gripping members are rounded, rod-like or ridge-like protrusions or projections, preferably part-cylindrical on the side facing towards the gap, that extend parallel to one another in the longitudinal direction. In this example, the gripping members are cylindrical rods, which has the advantage of maximising strength while minimising mass. Preferably, the gripping surface 34, 36 of at least one gripping member 24, 26 overhangs the open space or void 35 beneath the gap 40 when the gap is in the open configuration. The corresponding gripping surfaces 34, 36 when moved relatively closer present a downwardly oriented funnel which leads to a constriction at the narrowest part of the gap.
As shown in
It would, however, be possible for there to be some contact and some resulting friction between the cuff end portion 10 and the gripping surfaces 34, 36 in the constricted gap 41′, particularly if both gripping surfaces were on rollers free to rotate in response to such friction. In all cases, the cuff end portion is then restrained, but free to move at least in an upwards direction, between the opposed gripping surfaces 34, 36 with the beaded cuff end 3 being below the narrowed or constricted gap 40′.
As shown in
In this regard, it can be seen in
As shown in
Because the first and second gripping members 24, 26 move horizontally it is beneficial to re-direct forces in the cuff end portion 10 from substantially horizontal to substantially vertical, so that the glove is peeled smoothly off the former 4. As shown in
The first and second actuators 31, 32 then continue to move the gripping device 25 horizontally and also longitudinally in order to track the longitudinal motion of the formers 4, until the glove is fully stripped. The motion causes the glove, which is held only at the cuff end portion 10 where this meets the beaded cuff end 3, to fall in a substantially horizontal orientation onto a glove deposition surface 70, provided by a belt conveyor 72
As the glove approaches the deposition surface 70 the first and second gripping actuators 31, 32 move the first and second gripping members 24, 26 apart to open the gap 40″. Air resistance, and frictional drag as the glove digit portion 7 begins to touch a lower longitudinally extending abutment 58, provided proximate an outer edge 71 of the deposition surface, cause the glove cuff end 10 to fall out from between the opposed gripping surfaces 34, 36, whereupon the glove 2 falls freely and is deposited substantially flat in a transverse orientation on the deposition surface 70. The lower abutment 58 has been found to be useful in dampening down movement of finger portions 7 so that the fingers 17, including the thumbs 19, do not fold over themselves.
During this process, a second air bar 73 sends out a blast of air 74 directed substantially downwardly at the finger portions, which helps to flatten these onto the conveying surface, following which, the cuff beaded end 3 is pulled free from between the open gripping surfaces 34, 36 so that the glove comes completely away from the gripping members 24, 26. Preferably, the air blast is powerful enough to secure or “pin” a portion or region of the glove firmly to the deposition surface 70 so that subsequent horizontal movement of the grippers away from the pinned region causes the glove cuff end to be pulled out fully from between the grippers, and then drop onto the deposition surface. The air blast (brake) pins the glove to the conveyor, stops it and pulls it out of the moving jaws of the gripper and is more effective the lower the jaws are to the conveyor. Although not illustrated, it will be appreciated that the gloves may, alternatively, be flattened and secured or pinned to the deposition surface by mechanical means, for example a cam, air driven or electrically operated mechanical device moving in the vertical (z) direction.
In some embodiments it is beneficial for the second air bar 73 to send out or emit a prolonged jet or stream of air directed substantially downwardly at the glove 2′ lying on the deposition surface 70. This stream of air maintains the glove 2′ in a flattened configuration, lying against the deposition surface 70, whilst the gripping members 24, 26 advance towards the next glove(s) 2 to be peeled from the former(s) 4. This has the advantage that the gripping members 24, 26 may be positioned closer to the deposition surface 70 without hitting or disturbing the glove(s) 2′ on the deposition surface 70 during movement of the gripping members 24, 26, as the glove 2′ and in particular the beaded end 3 of the cuff are flattened against the deposition surface 70.
The closer the gripping members 24, 26 are to the deposition surface 70 the easier it is for the combination of the friction forces between the glove 2 and the lower longitudinally extending abutment 58, the friction forces between the glove 2 and the deposition surface 70, and the blast of air 74 from the second air bar 73 to stop or arrest movement of the glove 2 in exactly the required transverse position on the deposition surface 70 and the conveyor 72, i.e. each of the gloves 2′ removed from the formers 4 is positioned at a relatively consistent distance from the outer edge 71 of the deposition surface 70.
As will be appreciated from the above description, the arrangement is such that the glove is stripped substantially downwardly from the former 4 and is turned substantially horizontal by the abutment as the glove cuff end portion 10 is pulled by the first and second gripping members in the first direction 51.
Optionally, as shown in the drawings, the third actuator 33 may also move the gripping device 25 with a longitudinal component of motion to match the forwards speed 99 of the formers 4.
Following stripping, the cyclic movement of the gripping device 25 is completed, for example as shown in
The actuators 31, 32, 33 described above operate under the control of a controller 50 and together form a synchronised set of actuators configured to perform, in sequence, the process steps described above.
Once on the conveyor surface 70, as shown in
In the embodiment described above, the conveyor surface 70 on which gloves 2′ are deposited moves in the opposite direction as the dip-moulding formers 4. The advantage of this arrangement is that the total travel taken by the carriages 27, 28 in the longitudinal direction (i.e. the direction of motion of the formers) is reduced.
A particular benefit of the invention is that deposited gloves on the receiving surface 70 are kept flatter. The gloves 2 are dropped in a substantially horizontal orientation in close proximity with the receiving surface, so that the gloves do not have time to bend or fold in an unwanted way prior to coming to rest on the receiving surface, or on a previously deposited glove, if a stack is being formed.
Another significant benefit of the invention is that the automatic registration of the cuff beaded end 3 with the opposed gripping surfaces 34, 36 helps to ensure that the cuff end is then deposited in a known and predicable manner, for example with a separation from an edge 71, 71′ of the receiving surface 70, that is highly consistent and repeatable from glove to glove, as shown in
These factors help to make further processing of the gloves more consistent and help to optimise the way gloves lie one on another when formed into a stack. This in turn helps to increase the number of gloves that can be packed into a glove dispenser of a given volume.
Although the invention has been described with particular reference to the production of disposable hygienic inspection gloves, the principles of the invention can be applied a wide range of different types of flexible gloves, for example cleaning gloves.
The invention described above, in its various embodiments, therefore provides a convenient apparatus and method for stripping and subsequent handling of a variety of types of flexible glove produced in a dip-moulding process when such gloves are to be stripped off a former 4 and then moved for further processing, for example being deposited on a conveyor 72, in a stack or in a box.
It is to be recognized that various alterations, modifications, and/or additions may be introduced into the methods, and the constructions and arrangements of parts described above without departing from the spirit or scope of the present invention, as defined by the appended claims.
It is to be recognized that various alterations, modifications, and/or additions may be introduced into the methods, and the constructions and arrangements of parts described above without departing from the spirit or scope of the present invention, as defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1614568 | Aug 2016 | GB | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/GB2017/052507 | 8/25/2017 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2018/037243 | 3/1/2018 | WO | A |
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| Number | Date | Country | |
|---|---|---|---|
| 20190193306 A1 | Jun 2019 | US |
