US2768653A

US2768653A - Packaging machine

Info

Publication number: US2768653A
Application number: US398674A
Authority: US
Inventors: Robert W Vergobbi
Original assignee: Pneumatic Scale Corp
Current assignee: Pneumatic Scale Corp
Priority date: 1953-12-17
Filing date: 1953-12-17
Publication date: 1956-10-30
Anticipated expiration: 1973-10-30

Description

R. W. VERGOBBI PACKAGING MACHINE Oost.V 30, 1956 `2 sheets-shut 1 Filed Dec. 17, 1955 INVENTOR.

HTTORNEV Oct. 30, 1956 R. w. VERGQBBI 2,768,653

PACKAGING MACHINE Filed Dec. 17, 195s 2 spears-sneer 2 United States Patent O znssse PACKAGING MAcmNE Robert W. Vergobbi, Quincy, Mass., assignor to Pneumatic Scale Corporation, Limited, Quincy, Mass., a corporation of Massachusetts Application December 17, 19513, Serial No. 398,674

Claims. (Cl. 141-59) This invention relates to a packaging machine and more particularly to a vacuum filling machine.

One object of the invention is to provide a novel and improved vacuum filling machine which is particularly adapted to fill flexible containers, such as cartons, bags or the like, with finely comminuted solid materials in a rapid, practical and efficient manner.

Another object of the invention is to provide a vacuum filling machine having novel and improved means for supporting a flat, flexible container in operative relation to vacuum filling mechanism in a simple and practical manner such as to avoid any stress on the flexible material during the vacuum filling operation.

With these general objects in View and such others as may hereinafter appear, the present invention consists in the filling machine and in the various structures, a1'- rangements and combinations of parts hereinafter described and particularly defined in the claims at the end of this specification.

In the drawings illustrating the preferred embodiments of the present invention:

Fig. l is a vertical sectional View of a vacuum filling machine embodying the present invention;

Fig. 2 is a front elevation illustrating the container holding pocket;

Fig. 3 is a cross-sectional View of the pocket taken on the line 3-3 of Fig. 2;

Fig. 4 is a cross-sectional View taken on line 4-4 of Fig. 2;

Fig. 5 is a side elevation illustrating the container holding pocket in its open position;

Fig. 6 is a side elevation illustrating the pocket in a lowered and closed position; and

Fig. 7 is a cross-sectional view taken on line 7 7 of Fig. 3.

In general the invention comprises a novel and improved filling machine which is particularly adapted to rapidly and efficiently fill a plurality of successive relatively flat, fiexible containers with a quantity of finelyY comminuted ilowable solid material, such as flour, powdered gelatin or the like. In its preferred form the present invention contemplates apparatus having a filling head provided with a suction opening connected to a source of vacuum and a material opening connected to a supply hopper filled with finely comminuted material and which is arranged to evaluate the container and to ll the same with the material. In the illustrated embodiment of the invention an endless chain gripper conveyer is provided for conveying successive formed containers open at the top to the filling mechanism, and in the operation of the machine provision is made for removing successive containers from the conveyer and elevating them to a filling position in communication with the filling head. The filled containers may then be lowered by the elevating means onto the carrier and advanced to top sealing mechanism to complete the production of the lled and sealed ba s.

Ign accordance with the present invention novel provision is made for supporting a relatively fragile flexible container, such as a fiat bag open at the top, in operative relation to the vacuum lling mechanism in a manner firice such as to avoid collapse of the bag during evacuation and filling thereof. In the illustrated embodiment of the invention the container supporting means comprises a holder having a hollow hinged portion provided at its upper end with a suction opening and a material supply opening. One side of the hollow hinged portion is open and is arranged to cooperate with a relatively stationary backing member having a resilient facing to form an airtight seal. In practice one side wall of the flat bag is clamped in airtight relation between the open side of the hollow hinged portion and the stationary backing member forming in effect a pocket wherein the opposed side wall of the fiat bag extends about the outside of the hinged portion. Thus, in operation when the suction and filling openings of the holder are connected to the vacuum filling mechanism, a predetermined charge of the commodity is formed in the pocket defined by the hollow member and the one side wall of the bag clamped thereagainst so that when the hinged portion is subsequently rocked to open the pocket, the holder may be withdrawn from the bag to leave the charge confined between the side walls of the flat bag.

In practice the bags may be preformed and placed over the hollow portion of the holder to be clamped thereto, or preferably the bags may be formed directly on the hollow portion of the holder in a bag forming and filling machine of the type illustrated and described in the United States patents to V. G. Williams, Nos. 2,351,382 and 2,556,382 wherein the machine is provided with an upper carrier for conveying the hollow material supply members and a lower carrier provided with bag supporting grippers. In the operation of such prior machines a web of bag forming material is drawn from a roll thereof through the open grippers and folded longitudinally in the form of a V to receive the material supply members lowered therebetween and which also serve as bag formers. The grippers are closed on the bag forming material about the forming members, and the web may then be sealed at transverse intervals between successive grippers whereupon the web may be severed transversely through the sealed portions to form individual flat bags open at the top and carried by the grippers. In the illustrated embodiment of the invention the forming members may comprise the hollow portions of the charge forming pockets, and after formation of the bags the pockets may 'be closed upon one side wall of the bag as described.

The grippers may then be opened and the bags elevated out of the grippers and presented to the vacuum filling mechanism. Thereafter the pockets may again be lowered to present the bags to the grippers to be conveyed to top sealing mechanism and discharged from the machine. Referring now to the drawings, and particularly to Fig. l, the invention is herein illustrated as embodied in a bag forming and filling machine wherein 10 represents a lower carrier comprising an endless chain conveyer 12 arranged to run over a sprocket 14 and which is provided with a plurality of spaced grippers 16 arranged to support and convey the formed bags, and 17 represents an upper carrier provided with bag holders or charge forming pockets 18 to which the bags may be transferred or about which the bags may be formed. The bag holders 18 are mounted to be elevated to remove the formed bags from the grippers 16 and to present them in operative relation to the vacuum filling mechanism, indicated generally at 20, to receive a charge of the cornmodity being packaged whereupon the holder is lowered to again present the bag between the jaws of a gripper being moved along in alignment with the holder.

Projecting from the chain 12 are a plurality of arms 22 on which the grippers are pivotally mounted, each gripper unit 16 comprising U-shaped ngers mounted on a pivot pin 24 which extends through the end of arm 22 and which are adapted to swing on the pivot pin so as t bring the opposed fingers together and clamp the bag between them. A coil spring 26 passes around pivot pin 24 and engages cross pieces formed at the lower ends of the fingers tending to force them together. A pin 23 mounted on arm 22 extends axially of the pin 24 between the fingers and acts as a stop to hold them in vertical position when closed. The grippers 16 are arranged to slide on a bar on track 30 which cooperates with lugs 32 extending downwardly from the cross pieces of the U-shaped fingers. The track 30 is widened at selected points to urge the lugs outwardly and effect opening of the grippers, and the track is narrowed at other points to permit the gripper fingers to close under the infiuence of the spring 26 to grip the bag along the marginal side edges thereof.

As herein shown, the sprocket 14 may be keyed to a hollow shaft 34 rotatably mounted on a central stationary shaft 36 and provided with a sleeve bushing 33. The shaft 36 is supported at its lower end in a hub member 40 forming a part of the machine frame, and the hollow shaft 34 may be rotated through a worm gear drive 42 from the main drive shaft 44 of the bag forming and filling machine. The hollow shaft 34 may be rotatably supported at its lower end in a hub member 46 forming a part of the machine frame and is further supported in an upstanding hub 48 formed in a bracket 50 attached to the machine frame. The bracket 50 is also arranged to support guide rails 52 in which the carrier chain 12 is guided.

The bag holders or charge forming pockets 18 are supported for vertical reciprocation in a slide bracket 54 attached to arms 56 of a spider 58 keyed to and rotatable with the hollow shaft 34. Each pocket 18 is connected by an arm 60 to a slide `member 62 slidingly mounted in the bracket 54, and each slide member is provided with a roller 64 which cooperates with a cam rail 66 to effect reciprocation of the bag holders during the coritinuous movement thereof from a lowered position in operative relation to the grippers 16 to an elevated position in operative engagement with the vacuum filling mechanism 20.

As herein illustrated, each bag holding unit 13 includes a hinged member 68 having a head portion-at its upper end provided with a suction opening 72 and a material inletV opening 74, the lower end of the hinged member comprising a wedge-shaped or V-sliaped hollow portion '70 open on one side, the hollow portion being U-shaped in cross section at its upper end, the legs of the U tapering to intersect with the base thereof at the lower end of the hollow portion. The hinged portion 68 is pivotally mounted on a pin 76 extended through the outer end of arm 60 carried by the slide bar 62. The hollow hinged portion 68 is arranged to cooperate with a relatively stationary fiat plate or backing member 7S depending from the outer end of the arm 60, the plate 78 being provided with a rubber or like resilient facing 80 for forming an airtight seal with the hinged pocket. In operation one wall of the flat bag is clamped between the hollow portion 70 and the rubber sealing portion 80, as shown, to support the bag in airtight relation with the hollow portion, the opposed side wall of the bag being extended about the outside of the hollow portion. A spring 82 connected between the hinged portion and the arm 60 is arranged to urge the pocket into closed position. The pocket is arranged to be opened by a cam rail 84 arranged to cooperate with a roller 86 carried by an arm 88 extended from the hinged portion 68.

The suction and

material inlet openings

72, 74 are arranged to be elevated into airtight relation with

corresponding openings

90, 92 formed in arms 945 of a bracket 96 keyed to and rotatable with the hollow shaft 34. rElie suction opening is connected by a flexible hose 98 to a port 100 formed in a suction head 102 mounted for rotation with the hollowshaft 34. Each port 100 communicates with an opening 104 which is arranged to communicate with an elongated port 106 formed in a stationary valve member 108 fast on the upper end of the central supporting shaft 36, the port 106 being in communication with a central passageway 110 formed in the shaft 36 which may be connected to a source of suction by a pipe 112. The material opening 92 formed in each arm 94 is connected by a flexible hose 114 to one of a plurality of outlets 116 formed in the lower end of a material supply hopper 118 containing a supply of the commodity being packaged.

As illustrated in Fig. 1, the suction head 102 is mounted on the upper end of an enlarged diameter portion of the hollow shaft 34, and the stationary valve member 108 is maintained in airtight relation with the underside of the suction head 102 by a coil spring 120.

From the description thus far it will be seen that in the operation of the machine the bags carried by the grippers 16 and formed on or otherwise placed on the hollow portion 68 of the pockets may be clamped in the pocket by closing of the hinged portion against the fiat portion of the pocket, and upon opening of the gripper ngeis the pockets may be elevated with the bag into operative relation to the filling mechanism, the suction and

material inlet openings

72, 74 engaging the

openings

90, 92 in airtight relation. Thereafter as successive ports 100 come into alignment with the stationary port 106, the bag is evacuated, and the material is withdrawn from the supply hopper to form a charge in the pocket defined by the hollow portion 68 and one side wall of the bag clamped thereagainst. In practice a fine mesh filter screen 122 may be provided for the suction opening 72 to prevent the material from being drawn from the pocket into the suction lines. After the charge is formed, the suction is cut off as the port 100 leaves the elongated port 106, and the pocket may then be again lowered to present the bag between the fingers of the open grippers 16, whereupon the gripper fingers may be closed on the marginal side edges of the bag. The hinged portion of the pocket may then be rocked to an open position and the pocket elevated out of the bag leaving the charge of material deposited between the side walls thereof. The bag may then be conveyed to top sealing mechanism for sealing the open top of the bag whereupon the bags are discharged from the machine.

From the above description it will be seen that the present invention provides novel and improved apparatus for rapidly and efiiciently filling successive flexible, fiat and relatively fragile containers by vacuum filling wherein novel provision is made for supporting such containers in airtight relation to the vacuum filling mechanism and in a manner such as to avoid collapse of the container when subjected to vacuum to evacuate the same and to form a charge of the commodity within the container.

While the preferred embodiment of the invention has been herein illustrated and described, it will be understood that the invention may be embodied in other forms within the scope of the following claims.

Having thus described the invention, what is claimed is:

l. in a container filling machine for vacuum filling flat fiexible bags, in combination, vacuum filling means, and means for supporting a flat bag in operative relation to said filling means comprising a holder having vacuum and fillingipassages therein and including a hollow member open on at least one side and arranged to support a bag positioned 'tliereabout with one side wall of the bag extending across and enclosing said open side, and sealing means cooperating with said open side for clamping said one side wall of the bag in airtight relation to said hollow portion to permit evacuation and filling thereof whereby to enable the `material to be deposited between the side walls of the bag upon release of said one side wall and removal of the Vholder .from the bag.

2. In a container filling machine for vacuum filling flat fiexible bags, in combination, vacuum filling means, and means for supporting a fiat bag in operative relation to said lling means comprising a holder including a hollow member open on one side and arranged to support a bag thereabout, and means cooperating with said open side for clamping one side wall of the bag in airtight relation to said hollow portion to permit evacuation and filling thereof whereby to enable the material to be deposited between the side walls of the bag upon release of said one side wall and removal of the holder from the bag, said hollow member being U-shaped in cross section and V-shaped in side elevation to fit between the side walls of the fiat bag being filled.

3. In a machine of the character described, in combination, vacuum filling means, and means for supporting a fiat flexible bag in operative relation to said filling means comprising a holder having vacuum and filling passages therein and including a hollow charge forming member open on one side and adapted to be inserted within the side walls of a bag to be filled with one side wall of the bag extending across and enclosing said open side, and a fiat plate cooperating with said open side arranged to clamp said one side wall of the bag in airtight relation to said hollow portion to permit operation of said filling means to form a charge of material in the pocket defined by said hollow portion and one side wall of the bag whereby to enable the charge to be deposited between the side walls of the bag upon release of said one side wall and withdrawal of the hollow portion from the bag.

4. ln a machine of the character described, in cornbination, vacuum filling means having a suction opening adapted for connection to a source of suction and a material inlet opening adapted for connection to a supply of the material, and means for supporting a flat iieXible bag in operative relation to said filling means comprising a holder having corresponding suction and material openings for cooperation with said first-named openings and including a hollow charge forming member open on one side and adapted to be inserted between the side walls of a bag to be filled with one side wall of the bag extending across and enclosing said open side, and a flat plate having a resilient backing member cooperating with said open side and arranged to clamp said one side wall of the bag in airtight relation to said hollow portion to permit operation of said filling means to form a charge of material in the pocket defined by said hollow portion and said one side wall of the bag whereby to enable the charge to be deposited between the side walls of the bag upon release of said one side wall and withdrawal of the hollow portion from the bag.

5. ln a machine of the character described, in combination, vacuum filling means having a suction opening adapted for connection to a source of suction and a material inlet opening adapted for connection to a supply of the material, and vertically reciprocable means for supporting a fiat exible bag in Operative relation to said filling means comprising a pivotally mounted holder having a head portion provided with corresponding suction and material openings for cooperation with said firstnamed openings and including a hollow charge forming member open on one side and adapted to be inserted between the side walls of a bag to be filled, a relatively stationary fiat plate having a resilient backing member, means for rocking said pivotally mounted portion into engagement with said backing member to clamp one side wall of the bag in airtight relation to the hollow portion around said open side to permit operation of said filling means to form a charge of material in the pocket dened by said hollow portion and said one side wall of the bag whereby to enable the charge to be deposited between the side walls of the bag upon release of said one side wall and withdrawal of the holder from the bag. and means for reciprocating said holder into and out of operative engagement with said filling means.

6. In a machine of the character described, in combination, vacuum filling means, a conveyor for supporting fiat flexible bags, and a vertically reciprocable bag holder for elevating a fiat bag from the conveyer and into operative relation to said filling means, said holder having vacuum and filling passages therein and comprising a pivotally mounted hollow portion open on one side and arranged to support a bag thereabout, and a relatively stationary baci-:ing member, means for rocking the hollow portion into engagement with the backing member to clamp one side wail of the bag into airtight relation with said hollow portion around the open side thereof to permit evacuation and filling thereof by said filling means, said reciprocable holder being subsequently lowered to return the bag to the conveyer and to deposit the material between the side walls of the bag upon rocking of the hollow portion to release the bag and upon elevation of the holder to withdraw the same from the bag.

7. A vacuum filling machine as defined in claim 6 wherein the vacuum filling means and the vertically reciprocable bag holders are continuously rotated, and the conveyer is continuously moved in timed relation thereto, said conveyer being provided with a plurality of bag supporting grippers, and means for opening and closing the grippers during the continuous movement thereof.

8. In a vacuum filling machine of the character described, in combination, vacuum filling means having vacuum and filling passages therein, and means for supporting a flat flexible bag in operative relation to said lling means comprising a pivotally mounted hollow member having a suction opening and a material inlet at its upper end for cooperation with the filling means, the lower end thereof being wedge-shaped and open on one side and adapted to be inserted between the side walls of a flat bag to be filled, and a relatively stationary plate provided with a resilient backing member cooperating with said hollow member to clamp one side wall of the bag in airtight relation around the open side of said holder to permit evacuation and filling thereof by said vacuum filling means.

9. In a container filling machine for vacuum filling fiat flexible bags, in combination, vacuum filling means having vacuum and filling passages therein, and means for supporting a fiat bag in operative relation to said filling means comprising a holder including a hollow member open on one side and arranged to support a bag positioned thereabout, and sealing means engaging the hollow member around said open side thereof forming an airtight pocket with one side wall of the bag disposed between the sealing means and the hollow bag supporting member whereby to enable the pocket to be vacuum filled with material by said vacuum filling means, and means for withdrawing the hollow member from its bag after the latter has been filled.

il). ln a bag filling machine, in combination, bag filling means, means including a holder for supporting a fiat bag in operative relation to the filling means, said holder having a filling opening and comprising a hollow member open on one side and arranged to support a bag thereabout with one side wail of the bag extending across and enclosing said open side, sealing means engaging the hollow member around said open side thereof forming an airtight pocket with said one side wall of the bag disposed between the sealing means and the hollow bag supporting member whereby to enable the pocket to be lled with material while the bag is thus supported, and means for withdrawing the hollow member from its bag after the latter has been filled.

Belcher et al Mar. 14, 1944 Carter June 27, 1950