US3822527A

US3822527A - Container handling apparatus

Info

Publication number: US3822527A
Application number: US00304954A
Authority: US
Inventors: G Germunson; F Schopp
Original assignee: Yakima Wire Works Inc
Current assignee: Yakima Wire Works Inc
Priority date: 1972-11-09
Filing date: 1972-11-09
Publication date: 1974-07-09
Anticipated expiration: 1991-07-09

Abstract

Flexible containers, such as polyethylene bags, are held on a standard wicket and are individually opened by a blast of air and the insertion of an expandable scoop. The bag is then filled with material and after a predetermined time a two finger gripping device engages the top edge of the filled bag and the scoop is removed. The bag is then simultaneously released and pulled from the wicket by the gripping means which further pulls the filled bag directly into a bag closing device or a pocket of a collecting conveyor.

Description

United States Patent [191 Germunson et a1.

[ July 9, 1974' CONTAINER HANDLING APPARATUS [75] Inventors: Gary G. Germunson; Fredrick R.

Schopp, both of Yakima, Wash.

[73] Assignee: Yakima Wire Works, lnc., Yakima,

Wash.

[22] Filed: Nov. 9, 1972 21 Appl. No.: 304,954

[52] US. Cl 53/189, 53/266, 53/385 [51] Int. Cl B65b 43/36, B65b 51/04 [58] Field of Search 53/37, 52, 187, 188, 189, 1 53/190, 384, 385, 266

[56] References Cited UNITED STATES PATENTS 7 11/1955 Lindstaedt et al. 53/188 Thorne et al. 53/1 90 x Williams 53/189 Primary Examiner-Robert L. Spruill 5 7 ABSTRACT Flexible containers, such as polyethylene bags, are held on a standard wicket and are individually opened by a blast of air and the insertion of an expandable scoop. The bag is then filled with material and after a predetermined time a two finger gripping device engages the top edge of the filled bag and the scoop is removed. The bag is then simultaneously released and pulled from the wicket by the gripping means which further pulls the filled bag directly into a bag closing device or a pocket of a collecting conveyor.

10 Claims, 5 Drawing Figures containers.

.1 I CONTAINER HANDLING APPARATUS BACKGROUND OF THE INVENTION This invention pertains to container handling apparatus and more particularly to apparatus and method for filling and moving a flexible bag into a closing device.

. DESCRIPTION OF THE PRIOR ART Various types of commercial equipment is available for filling flexible bags with oranges, apples and the like. In general, this prior art equipment first fills the bag and after filling the bag is manually fed into a bag closing device or manually placed on a conveyer of SUMMARY OF THE INVENTION It is an object of this invention to provide an in-line flling and closing apparatus and method for flexible It is another object of this invention to provide a bag handling device in which the bag is automatically filled and pulled by its upper edge directly into the throat of a'bag closing device or into a pocket of a collecting conveyor. f It is another object of this invention to provide a bag handling apparatus which is inexpensive to operate and is completely automatic in operation.

Basicallythese objects are accomplished by providing means for releasably holding a plurality of flexible containers of the type suitable for handling solid articles such as apples, oranges or the like, means for opening the container, means for guiding the articles past the upper edge of the opened container, container closing means, means for gripping the upper edge of the container, pulling the container off the releaseable holdingmeans while supporting the container against falling and moving the container into the pocket of a collecting conveyor or preferably into a container closing means. and control means for releasing said holding means as said gripping means engages the edge of the container and for releasing the grippingmeans upon delivery of the container into the collecting conveyor or preferably into the container closing apparatus.

The inline feature of the apparatus, that is, the direct movement of the container from the filling position to the closing position as in the preferred embodiment advantageously saves time and unnecessary movements in handling of the container. Where. the container will be pulled to a collecting conveyor which delivers the containers from several filling and handling apparatuses to a single bag closing means, the apparatus advantageously operates quickly and with far less mechanisms than-prior art handling apparatus.

In the preferred apparatus, the container, a plastic bag, is opened by a blast of air' and is held open by an expandable scoop/The scoop is collapsed prior to insertion in the bag and thus has the advantage of avoiding the edges when being inserted in the bag and is then expanded to hold the bag in the open position.

The most important advantage results from movement of the bag by gripping its upper edge with a gripping mechanism. The gripping mechanism holds the 2 bag up while it is moved to the closing apparatus or collecting conveyor thus preventing tipping of the bag and pulls the bag directly between the nip rollers of a conventional bag closing device. The movement is thus direct, simple and positive.

BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWINGS FIG. I is a schematic diagram illustrating the control circuit and components of a container handling apparatus employing the principles of the invention.

FIG. 2 is a fragmentary perspective of the embodiment illustrated in FIG. 1.

FIG. 3 is a schematic illustration showing placement of a container in a container closing apparatus.

FIG. 4 isa schematic illustration of a modified form of the invention in which several container handling apparatuses feed a pocket-type collecting conveyor.

FIG. 5 is a fragmentary view looking in the direction of the arrows 5-5 in FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT As-best shown in FIGS. 1 and 2. the handling apparatus includes a platform 10 for supporting a plurality of flexible containers, such as polyethylene bags B. Bags of this type are normally manufactured and sold to the customer'in bundles joined together by a U-shaped wicket 12. In the handling apparatus of this invention the bags and wicket are then placed against the platform 10 with the open ends of the wicket placed through'holes in the platform to hold the bags on the platform. The platform islocated at the discharge end of a conveyor 14 which delivers pre-weighed batches of apples, organes or the like to abag' filling station F S. A

I air from a'nozzle 20 and are continually held open by the scoop I8 and air from a fan 22. Finally the filled bags are removed from the filling area by a gripping means 24 that grasps theedge of the bag, supporting and pulling the bag free of the filling area into either a bag closing device 26 or into a collecting conveyor 28 (FIG. 4).

The platform 10 is provided with a sharp corner 29 which allows the shorter edge of the bag to be exposed to a stream of air from the nozzle 20 so that the edge is caught by the air and billows outwardly to open the bag. As is well known the conventional bag B in this field has one edgeextending up several inches from the opposite edge at the open top of the bag. The longer sides of the bags are then secured together by the wicket l2 and are pressed against the top surface of the platform 10 when installed in the handlingapparatus. The supporting platform is hinged at 30 and biased outwardly by a spring 32 sothat the bags are continually moved outwardly against a ramp 33 to expose the up-. perrnost bag to the air blast from the nozzle 20.

The clamps 16 include a pair of legs 34which are bent to provide a substantial surface in engagement with the top edge of the bag but allow access to the open top of the bag. The clamps support the bag as the articles are introduced into the bag but are lifted when the bag is removed from the filling station.

The scoop means 18 is provided with a pair of scoop halves 36 which are pivoted at their upper ends on a bracket 38. A cylinder and piston 40 are extendible to open the scoop halves into the position shown in phantom lines in FIG. 2 and upon retraction will draw the scoop halves together to collapse the scoop. When the scoop halves are collapsed they fit easily inside the opened top of the bag and when expanded into the phantom line position the scoop halves support and hold the bag open as well as guide the articles into the bag.

As best shown in FIG. 1, the gripping means 24 includes an elongated arm 40 which is pivoted at one end on a cam 42 and slightly in from its free end is pivoted to a link 44. The link 44 and the cam 42 are respectively pivoted on bases 46 and 48. The free end of the arm 40 is secured to a pair of gripping fingers 50 that can be opened into the phantom line position shown in F IG. 1 for engagement with the edge of a bag and are closed as in the solid line position to tightly grip the edge of the bag. The gripping means is shown in FIG. '1 spaced to the right of the bag filling station for purposes of clarity in the drawings. It should be understood, however, that in actual construction the bases 46 and 48 are placed closer to the bag supporting platform so that the gripping fingers 50 are movable into engagement with the upper edge of the bag B in the filling station FS. A motor through a conventional gear reduction and single revolution clutch unit 52 drives the cam 42 to position the fingers for movement along a path P. As is apparent the fingers move downwardly over the exposed edge of the bag between the scoop halves 36 and, after closing, draw the bag outwardly from the platform 10 in a straight line motion into the bag closing device 26.

The bag closing device 26 can be of any conventional construction. A preferred closure being a unit manufactured by Qwik Lok Corporation of Yakima, Washington. As is well known this type of closure employs a rubber disc 56 and a belt 58 which come together in a throat T (FIG. 3). The fingers 50 pull the opened bag into the throat allowing the disc and belt to gather the neck of the bag and force it into a plastic clip C of the type employed with this type of bag closing equipment. The fingers draw the bag positively well into the throat before releasing the bag so that there is little possibility of the neck of the bag not being properly fed into the bag closing machine.

The operation of the apparatus will now be described with reference to the pneumatic circuit shown in FIG. 1. Articles, such as apples, are pre-weighed and batched upstream on the conveyor 14 in any conventional manner and are fed off the conveyor when a bag is in position to be filled. The batch of apples pass through a tray 68 and lift a flap 69. The flap is con-' nectedto a switch which sends a signal to operate the clutch for one revolution of the cam 42. The cycle is started with the clamps 34 down holding the edge of the bag and the clutch is energized to begin revolving the cam42 in a clockwise direction. At this time the fingers 50 will be opened and the arm 40 pulled back from the feeding station FS. Air is fed from a high pressure supply line 70 through a valve 71 to the jet nozzle directing a high pressure blast of air against the exposed shorter edge of the bag 80, opening the bag. The 1 fan 22 is continuously operating to maintain the bag in an open position. The scoop halves 18 are collapsed and placed in the bag.

Once the cycle is continuously being repeated, the scoops will thenceforth be slowly lowered by a spring in a valve 72 forcing air through a valve 74 and thence out through a restriction valve 76.

When cam 42 engages a main control valve 78, as in the solid line illustration of FIG. 1, air from the supply line is passed through the valve 78 to a spring biased pilot controlled valve 80. The valve 80 is shifted to the left to allow pressurized air to enter the cylinder 82 pivoting the fingers into a closed position engaging the edge of the filled bag. Air is simultaneously allowed to vent from the cylinder 88 raising the clamps 34. Air from the valve 80 also passes through a bypass line 90 to the spring biased pilot operated valve 74 to admit air to the cylinder 72 to quickly raise the scoops 18. Thus at this point in the cycle a filled bag is gripped by the gripping means 24 and is being pulled onto a conveyor 92 with both the clamps 34 and the scoop l8 removed from the bag. When the scoop halves are raised, the lever arm which carries the halves releases a spring biased valve 102, moving the valve core to the right to connect line pressure to a spring biased pilot operated valve 104, thus moving its core to the right, and venting the cylinder 40 to allow the spring within the cylinder 40 to close the scoop halves 36. The scoop halves are closed quickly as the scoops begin to rise to avoid damaging the bag. The controls stay in this position while the fingers gripping the bag are pulled away from the feed station along the conveyor 92 into the throat of the bag closing device.

Assuming a continuous recycling of single revolution clutch, the cam 42 then comes away from the valve 78. The core of valve 78 moves downward, venting valve 80, again directing line pressure to cylinder 88 to lower the clamps on the next bag, the cylinder 82 is vented through valve 80 to open the fingers 50 and cylinder 72 is connected to the restriction valve 76. Air from cylinder 72 immediately moves a low pressure piston 106 to the left in valve 71 connecting air jet nozzle 20 with the air supply line 70. As the air continues to bleed out of cylinder 72, through valve 74 and the restriction valve 76 the low pressure piston remains to the left but as the supply of air in cylinder 72 is exhausted the spring of valve 71 moves the low pressure piston to the right terminating the supply of air to the nozzle 20. When the air is exhausted from cylinder 72 the scoops 18 will be fully inserted into the bag and the arm 100 will have moved the valve 102 to the left thus connecting line 108 to vent through valve 102. Venting the pilot of valve 104 will move the valve to the left directing high pressure air into the cylinder 40 opening the scoops inside the bag. When the cam 42 again engages the valve 78 the cycle is repeated as earlier described.

in some installations it may be more desirable to use several bag handling apparatuses 110 identical in construction with that of the preferred embodiment.-

Rather than pull the filled bags to the throat of a bag closing, however, the bags will be pulled into pockets of a conventional pocket conveyor 28. This type of conveyor has a plurality of downwardly extending pockets which are slightly less in depth than the height of the bag so that once the bag is delivered to the pockets of a conveyor the fingers are released and the bag can then be collected and moved to a single bag closing device 26.

that variations and modifications will be apparent to one skilled in the art without departing from the principles of the invention. Accordingly, the invention is not to be limited to the specific embodiments described.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Container handling apparatus comprising means for releasably holding a plurality of flexible containers adapted for holding solid articles and having a closed bottom and opposite upper edges, means for opening the container, means for feeding the articles past the upper edges into the opened container, container closing means, means for gripping an upper edge of the container and pulling the container off the releasable holding means while supporting the container against falling and moving the container'toward said container closing means, and control means for releasing said holding means as said gripping means engages the edge of the container.

2. The handling apparatus of claim 1 said container opening means including scoop means insertable into said container and expandable to enlarge the interior of the container.

3. The handling apparatus of claim 1 said gripping means including a set of fingers engageable on the inner and o'utersides of said upper edge.

4. The handling apparatus of claim 1 said container holding means holding one said upper edge of said container, said gripping means gripping the opposite edge, and said gripping means being movable in a vertical plane at right angles to said holding means, whereby said container is adapted to be moved in a straight line to said container closing means.

5. The handling apparatus of claim 4 said bag opening means including air blast means for separating said opposite edges, fan means for holding the container open and scoop means insertable into said container and expandable to enlarge the interior of the container.

6. The handling apparatus of claim 5 said gripping means including a set of fingers engageable on the outer and inner sides of said upper edge.

7. The handling apparatus of claim 1 said releasable holding means including a platform having a bend over which the containers are laid and clamp means engageable with the containers for pressing them against said platform.

8. The handling apparatus of claim 1 said container closing means including a collecting conveyor for carrying a plurality of filled containers.

9. The handling apparatus of claim 1, said container holding means holding one said upper edge of said container, said gripping means gripping the opposite edge, and said gripping means beingmovable to pull said container directly to said container closing means.

10. Container handling apparatus comprising means for releasably holding a plurality of flexible containers adapted forholding solid articles and having a closed bottom and opposite upper edges, means for opening the container, means for feeding the articles past the upper edges into the opened container while being held by said releasable holding means, container closing means, means for moving the container to said con tainer closing means, said moving means including means for gripping by squeezing the inside and outside surfaces of 'anupper edge of the container and pulling the container off the releasable holding means while supporting the container against falling, and control means for releasing said holding means as said gripping means engages the edge of the container.

Claims

1. Container handling apparatus comprising means for releasably holding a plurality of flexible containers adapted for holding solid articles and having a closed bottom and opposite upper edges, means for opening the container, means for feeding the articles past the upper edges into the opened container, container closing means, means for gripping an upper edge of the container and pulling the container off the releasable holding means while supporting the container against falling and moving the container toward said container closing means, and control means for releasing said holding means as said gripping means engages the edge of the container.

3. The handling apparatus of claim 1 said gripping means including a set of fingers engageable on the inner and outer sides of said upper edge.

9. The handling apparatus of claim 1, said container holding means holding one said upper edge of said container, said gripping means gripping the opposite edge, and said gripping means being movable to pull said container directly to said container closing means.

10. Container handling apparatus comprising means for releasably holding a plurality of flexible containers adapted for holding solid articles and having a closed bottom and opposite upper edges, means for opening the container, means for feeding the articles past the upper edges into the opened container while being held by said releasable holding means, container closing means, means for moving the container to said container closing means, said moving means including means for gripping by squeezing the inside and outside surfaces of an upper edge of the container and pulling the container off the releasable holding means while supporting the container against falling, and control means for releasing said holding means as said gripping means engages the edge of the container.