Bag opening and filling machine

June 30, 1964

3,138,907

J. F. GERBE

BAG OPENING AND FILLING MACHINE

Filed Oct. 19, 1961

Sheets-Sheet 1

<img file="US3138907A_D0001.tif" />

J. F. GERBE

3,138,907

BAG OPENING AND FILLING MACHINE

June 30, 1964

Filed Oct. 19, 1961

Sheets-Sheet 2

<img file="US3138907A_D0002.tif" />

June 30, 1964

3,138,907

J. F. GERBE

BAG OPENING AND FILLING MACHINE

Filed Oct. 19, 1961

Sheets-Sheet 3

<img file="US3138907A_D0003.tif" />

FIG. 4

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INVENTOR

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John F. Gerbe

<img file="US3138907A_D0006.tif" />

ATTORNEYS

United States Patent Office _Patented

FIG. 4 is a perspective front view of the machine showing the funnel in its complete funnel form; and

FIG. 5 is a vertical side cross-section taken along the line 5—5 in FIG. 4.

As shown in FIG. 1, an upper portion of the side wall 6 of the machine is provided with an air inlet 7 through which air is drawn by a motor driven fan 8 whose speed is controlled by rheostat 9. The air from the fan is discharged through an air duct 10 provided internally with a butterfly valve 11 as shown in FIG. 2.

The discharge end of the air duct directs the air downwardly against the upper front portion of the foremost bag 12 of a stack thereof. The bags are advantageously formed of plastic material and have an open top with an 15 upper flap 13 extending upwardly beyond the open top of the bag. Each of the bag flaps is provided with a pair of openings 14 which are advantageously connected, to the uppermost edge of the flap by a tearing or breaking line 15. The bags are supported in stacked position by 20 a bail 16 or other supporting rack having a U-shaped configuration. The closed end of the U-shaped bail 16 is supported on a hook 17 and the opposite end of the arms of the bail are supported higher on a transverse bar or rod 18. A pendulum-like weight 19 is hung from a 25 supporting rod 20 near the top of the stack of the bags and is free to hang downwardly against the rearwardmost bag so as to urge the entire stack forward, that is, to the right in FIG. 2.

Above the open top of the bags and in front thereof 30 is mounted a rectangular guide funnel 21. The guide funnel is composed of two complementary halves 21A and 21B, each half being substantially U-shaped in crosssection with the arms of each section overlapping or telescoping about the arms of the other section. The upper 35 portion of each funnel half section flares outwardly in all directions and the lower portion of each section , is shaped to form a discharge spout through which material may be discharged without impediment when the two halves are positioned in the completed-funnel form. The 40 two halves of the funnel are mounted on separate rocker arms 22A and 22B so that when the rocker arms are rotated to an upper position the two halves, of the funnel are moved into a bag-guide form characterized by expansion of the upper end of the funnel and contraction of 45 its lower end. In the other lower position of the rocker arms 22A and 22B, the two halves of the funnel are brought into the completed funnel form shown in FIG. 4. As can be clearly seen in FIG. 3 wherein the funnel sections are in the bag-guide form, the lowermost end of the 5q funnel is adapted to enter the opened top of a bag which is temporarily held open by a blast of air from the fan 8. It will be also seen in FIG. 4 that the movement of the two funnel halves to the form of a completed funnel causes the lower end of the funnel to enter into the opened 55 top of the bag and to engage its inner surface so as to support the bag in the fully opened condition.

Movement of the complementary halves of the funnel 21 as well as control of the supply of bag-opening air is effected by movement of a bag support plate 23. This 60 plate is positioned directly below and in front of the bottom of the stack of bags and is mounted on a shaft 24. The ends of the shaft 24 extend through a pair of bearing blocks 25 secured to the front frame 26 of the machine. The ends of the shaft 24 project through the innermost 65 portion of a pair of lower rocker plates 27. Each lower rocker plate is further provided with a downwardly and forwardly depending arm 28 to the end of which there is secured a spring 29. The action of the spring, one end s of which is Connected to the front frame 26 of the machine, . is to hold the lower rocker plate 27 in its horizontal position with the bag supporting plate 23 similarly maintained

3,138,907

BAG OPENING AND FILLING MACHINE John F. Gerbe, Mineola, N.Y., assignor to Tele-Sonic Packaging Corporation, New York, N.Y., a corporation of New York 5

Filed Oct. 19,1961, Ser. No. 146,267

Claims. (Cl. 53—385)

This invention relates to packaging machines, and more particularly, to a package machine for filling pliable con- ιθ tainers such as bags and the like.

In bag filling devices of the prior art, it has been a common expedient to open the bag by means of a blast of air. It is clearly apparent, however, that the bags will not remain in their distended or opened condition unless 15 either the air supply is continued or some mechanical device is used to hold the bag open. The continued blast of air into a bag during the filling operation is particularly disadvantageous when the bag is being filled with light material because the blast of air rebounding from 20 the interior of the bag tends to carry the filling material out of the bag and into the ambient atmosphere. Mechanical devices proposed for eliminating this problem have been characterized generally by such small discharge openings positioned within the interior of the opened bag that 25 the filling operation is impeded.

I have now devised a bag opening and filling machine which is free from the objections of the prior art devices in that a mechanical loading element engages an opened bag and holds it in a completely distended position so 30 that the discharge opening in the loading element has the same cross-sectional area as that of the opened bag. The machine of the present invention comprises a bag supporting rack, a plurality of stacked flat-folded open-top bags each supported by a flap extending upwardly above 35 its open top and frangibly engaging the supporting rack. An air supply duct is positioned so as to direct a flow of air downwardly against the open top of the foremost bag of the stack thereof, and advantageously a butterfly valve is movably mounted within this air supply duct. A rec- 40 tangular guide funnel is positioned above and in front of the open top of the foremost bag of the stack thereof, ^:the funnel being composed of two complementary halves joined together along two opposite telescoping sides thereof with a rocker arm supporting each of the two halves of ₄₅the funnel to permit this telescoping motion. In one of the extreme positions of the two halves of the funnel in the course of this telescoping motion, the halves form a complete funnel and in the other extreme position they form a bag guide in which the lower end of the funnel ₅₀is contracted and the upper end of the funnel is expanded. A trip lever is provided which has two operative positions and which is connected to the funnel and to the butterfly valve so as to move the two halves of the funnel to the bag-guide form and to open the valve when the trip lever 55 is in one position and so as simultaneously to close the butterfly valve and to move the two halves of the funnel to the complete funnel form with the lower end of the funnel engaging and supporting the air-opened top portion of the bag when the trip lever is in another position. 60 These and other novel features of the bag opening . and filling machine of my invention will be more readily understood from the following description taken in conjunction with the drawings in which:

FIG. 1 is a perspective view, partially broken away, of the complete machine;

FIG. 2 is a vertical side cross-section taken through the center of the machine shown in FIG. 1;

FIG. 3 is a perspective front view of the machine showing the two halves of the funnel in their bag guide ' position;

3,138,907 ³ in a horizontal position directly in line vertically with the discharge end of the funnel 21.

The forward portion of each lower rocker plate 27 is connected by means of a journal 30 to the lower end of an actuating arm 31 which rises vertically within the front corner of the machine. The upper end of the actuating shaft 31 extends rearwardly and is journalled to the innermost end of the upper rocker plate 32. The upper rocker plate is secured to a supporting shaft 33 which extends through and is mounted in the air supply duct 10. Within the duct 10 the shaft is engaged by a boss 34 on which the buterfly valve 11 is mounted.

It will be seen, accordingly, that tripping movement of the bag supporting plate 23 to the dotted position shown in FIG. 5 causes the lower rocker plate 27 to rotate to its dotted position and to pull downwardly on the actuating shaft 31. This movement of the shaft 31 causes the upper rocker plate 32 to move downwardly in the direction of the arrow in FIG. 5 and thus rotate the butterfly valve 11 from the valve-closed position to the valveopened position (shown in dotted lines in FIG. 5). It will also be observed that the overall motion of the actuating shaft 31 is to move rearwardly as it moves downwardly. Accordingly, in order to impart the up and down motion of the actuating arm 31 to the funnel support rocker arms 22A and 22B, a boss 34' is mounted on the actuating shaft and is provided with an opening through which a rocker arm pin 35 freely projects. The forwardly projecting portion of the pin 35 projects through a vertical slot 36 in the front of the machine and engages an outboard portion of each rocker arm 22A and 22B. Thus, as the rocker pin 35 is moved downwardly by the movement of the actuating arm 31, it causes the rocker arms 22A and 22B to rotate in the direction of the arrows in FIG. 3 and thus move the complementary funnel halves 21A and 21B to the bag-guide position shown in FIG. 3. The rearward extension of the rocker pin 35 through the actuating arm boss 34' maintains engagement of the pin with the arm in spite of the rearward movement of the arm during its downward travel.

In operation of the bag opening and filling machine of the invention, the bag support plate 23 is pressed downwardly to its dotted position shown in FIG. 5. This opens the butterfly valve 11 and permits air to pass through the duct and downwardly against the top of the front bag in the stack thereof hanging in the front portion of the machine. This blast of air causes the front bag to billow open as shown in FIG. 3 and causes the bottom of the bag to escape from its stop plate 42. Inasmuch as the complementary funnel halves 21A and 21B are simultaneously raised to the bag-guide position, the lower ends of the two funnel halves are raised above the top of the bag and are in a contracted position. When pressure on the bag support plate 23 is released, this support plate moves to its horizontal position, the actuating arm is simultaneously raised and the butterfly valve 11 is moved to the valveclosed position. As this happens, the lower extremities of the funnel halves 21A and 21B move downwardly into the still distended bag and engage the inner surface of the upper portion of the bag by the time that the butterfly valve 11 reaches its valve-closed position. The weight of the funnel halves 21A and 21B, the action of the spring 29 and the pressure of the blast of air against the butterfly valve 11 as it approaches its valve-closed position cause the lower portion of the funnel halves to engage and support the opened bag by the time the air supply to the bag is shut off by the butterfly valve.

I have found that the generally rectangular cross-sectional shape of the funnel 21 is conductive to free flow of the material charged to the bag without being blocked by the charged material. This result is not obtained with a funnel having a circular cross-sectional shape. However, non-rectangular cross-sectional shapes are useful for other materials which do not present a flow problem.

The bag filling and opening machine of my invention is provided with means for adjusting its size to varying sizes of bags to be filled. Thus, the side walls of the machine are provided with telescoping portions interconnected by means of slots 36 and clamping nuts 37. The actuating arm 31 is also provided with a telescoping lower portion 31B which is also provided with a locking screw 38. By control of these two telescoping and locking devices the entire upper body portion of the machine may be raised or lowered to accommodate bags of different heights. It will also be seen that the funnel-supporting rocker arms 23A and 23B are provided with slots 39A and 39B as well as locking nuts 40A and 40B so that the arms may be moved toward one another or away from one another in order to change the width of the funnel in a direction crosswise of the front of the machine. In addition, each of the complementary halves of the funnel 21 is divided into two complementary quarters 21A', 21A, 21B' and 21B. The two pah's of complementary quarters constitute the complementary halves of the funnel. Thus, the complementary quarter 21A' is secured to an outward projection 23A' on the inboard end of the funnel rocker arm 23A, and an adjustable bolt 40A' is secured to the complementary funnel quarter 21A and extends through a slot 41A in the arm 23A' so that the complementary quarter 21A can be moved inwardly and outwardly with respect to the complementary quarter 21A' so as to decrease or increase the width of the funnel in a direction perpendicular to the front of the machine. The complementary funnel half 21B is similarly provided with these adjusting devices. This compound adjustment of the four quarters of the funnel 21 makes it possible to adjust the funnel size to any size bags.

The adjustment of the funnel to the appropriate bag size is so made that the discharge end of these funnel components in the bag-filling position firmly support the opened bag. However, this contact does not prevent the bag from being withdrawn from the discharge end of the funnel after the bag is filled, this withdrawal being made either by hand or by the weight of the bag or by some other independent bag handling device which is conventional in this art. It will be seen, however, that the downward movement of the filled bag, regardless of how it is moved, causes the filled bag to depress the bag support plate 23 and thus repeat the bag opening and filling operation.

The bag opening and filling machine of my invention is applicable for work with any conventional material-supplying device. This feature, together with its complete adaptability to a variety of bag sizes and shapes, contributes to the outstanding utility of the machine. It will also be understood that although the machine is described and claimed herein as being in an upright position so that the bags hang downwardly from their support rack, the machine can equally well be operated in a horizontal position with only such modifications as is required to support the bags in their horizontal position and to feed them upwardly into bag-opening position.