US1851017A - Bag filling machine - Google Patents

Description

March 29, 1932. K. MlDDELBoE BAG FILLING MACHINE 2 Sheets-Sheet Filed Jan. 4, 1930 March 1932. K MiDDELBOE 1,851,017

BAG FILLING MACHINE Filed Jan. 4, 1930 2 Sheets-Sheet 2 INVENTOR www@ Patented Mar. 29, 1932 KRISTEAN MIDDLBOE, 0F FEDERKSBEHG, CONHAG-EN, DENMARK, AS-

SGNOR T0 F. L. SMIDTH 8c C0., OF NEW YORK, N. Y.,

JERSEY a CORPORATION or NEW 'BAG FILLENG MACHINE Application led January 4, 1930, Serial No.

This invention relates to machines for lilling bags with freely flowing pulverulent material, such as cement,and more especially to machines of this general character in which the bags are filled through spouts which are introduced within the bags. Such machines are commonly used for the filling of self-closing bags, known as Vvalve bags, but the present invention is applicable to the filling of bags whether or not they are of the self-closing type. ln another applica-tion for Letters Patent of the United States Serial No. 305,221, liled September 11, 1928, there is shown and described a machine of this general character in which the bag to be filled is held upon and supported by the filling spout during the operation of filling and is released therefrom when the predetermined quantity of material has been delivered into the bag. In that construction the lilling spout is carried by one arm of a counter-balanced lever and a means is provided whereby, when the desired quantity of material has entered the bag, the lever is caused to swing on its axis and the inclination of the supporting part of the filling spout is increased suiiciently to permit the bag to slip from the spout. There is also provided a clamping device or presser by which, during the filling operation, the bag is clamped between the presser and the illing spout and when the supporting lever is swung upon its axis the spout is moved away from the presser so that the bag shall be free to slip from the spout, a means being provided to dislodge the bag from the-inclined portion of the spout. The dislodging means is shown in that case as striker which is arranged to be brought into contact with the bag at the proper time, preferably at the bottom of the bag near the corner, the effect of the striker being to cause the bag, the filling spout, and the supporting lever to swing about the axis of the lever, thereby increasing the inclination of the spout and insuring the dislodgment of the bag therefrom. In accordance with the present invention the lilling spout, during the operation of lilling, is held against movement with the bag clamped between itself and the presser, but when the predetermined weight of 418,514, and. in Hungary January 14, 1929.

material has been introduced intothe bag the lilling spout is released and, under the inliuence of, gravity, the filling spout, with the filled bag, swings to such position that the bag will slip from the filling spoutwithout the intervention of any other means. The rele se and discharge of the filling bag is thus eli'ected automatically. To accomplish this result, there is combined with the lilling spout and its support a weighing mechanism which, when the predetermined weight of material has been introduced into the bag, initiates the operation cf the releasing device.

rlhe invention will be more fully explained hereinafter with reference to the accompanying drawings in which it is illustrated, and in which:

lJigure 1 is a view in sectional elevation of a machine in which the invention is embodied, the bin from which the material is supplied being partly broken out to save space.

Figure 2 is a view in horizontal section on the plane indicated by the broken line 2-2 of higure 1, looking in the direction of the arrows.

Figure 3 is a detail view in section on the plane indicated by the broken line 3-3 of Figure 2, looking in the direction of the arrows, illustrating particularly the application of av spring to the slide or gate by which the liow of the material from the bin is permitted or stopped.

Figure e is a detail view in sectional elevation and on a larger scale, on the plane indicated by the broken line '-l-a of Figure 1, illustrating particularly the presser or clamping device.

The bin a, from which the material is supplied to the bags to be filled, is shown as having at al an outlet for the discharge of the material, the delivery of the material being controlled by a gate b, pivoted on the bottom of the bin, as at b3, so that it may swing in a horizontal plane and provided, Yas shown at b2 in Figure 3, with a. torsion spring which tends to close the gate when it is released.

T he material falls from the outlet a1 through a funnel b4 into the flared upper-end of the filling spout L, which is substantially L-shaped and is supported by a lever L1 y travel in slots K4 of the -main frame.

which is pivoted, as at L2, on a cross-rod between the two members of a suspension rod J1 which hangs from Vone end of a balance lever J2 from the other Vend of which hangs a weight rod J, at the lower end of which are hung the weights J3 which counterbal ance the weight of a bag p and its contents until the bag is filled to such a weight that it over-balances the weights` J 3-, whereby are initiated the operations to be described.v

The filling spout is shown in Figure l in the position which it assumes during the operation of filling and it is permitted only in a counter-clockwisedirection,v asseen in Figure l, being restrained from movement in the opposite direction by a bracket J t, supported by the members of the suspension rod J1.AV AV counter weight n kis supported by bracket arms J 5: on the opposite side of` the suspension rodJ1 from the filling spout. n It will be Vobserved that while the suspension rod is hung atV its upper end from the balance Vlever J2 and is capable of movement Vin a vertical direction, it is held from swinging to the right, Linder the inuence of the weight of the filled bag, by radius rods R, which have their bearings at s and s1, as

shown in FigureV l. The bag p to be filled is slipped upon the lower armv ofthe filling spoutV when the latter is swung upon the'axis 'L2 in a clockwise direction when the filling spout has been tilted todischarge thefiiled bagandthe machine is tobe set for the filling of an empty bag. l/Vhen the bag has been i placed in `positionon the filling spout the latter is swung to the position shown in Figure l and-is there held, the bag being clamped between the lower arm of the filling spout and the presserl K; The latter is supported by arms K1 from the lower ends of the two inemvbers of the suspension rod; J1 andcomprises a plunger K2 which is shaped at its lower end to conform to the filling. spout L. The plunger, supported-in the main frame of the presser, is pressed downwardf byspring-K4L andits movement is limited by pins K3 whih 57 this Vmeans variations in thickness of thebags andfslight' relative movements ofthe lling spout are compensated-for and the bag held Y from accidentaldislodgmentduring the filling operation. v

l *The filling spout is so proportionedthat the'center ofV gravity ofthe bag and its contents, during the operation of filling, is offset to the left, as shown in Figure l, andv the supporting lever L1, rwith the filling'spout, must therefore be locked, during the operation of` filling, against swinging` upon the axis L2. Accordingly, the leverL1 is extended upward fromitsl axis L2 and is provided witha stop L3, they movement of which to the left during the opera-tionfof filling is prevented by a detentm3 which isi-carried..v by the shaft V,axis ofy a tripper 'armA or lever-m1.

to swing The lever m1 is connected at its upper-end with the gate Z) through a chain bz2-and anV arm h1 on the gate b, so that when the gate Z) is moved to a position to permit the flow of material from the bin intothe filling spout the lever m1 will be moved from theposition shown by broken lines in Figure l to the position shown by full lines and the detent m3 will be in such relation to the stop L3 of the Y .lever L1 that movement of the lever L1 and Vtherefore of the filling spout L will beprevented. VOn theV other hand,cwhen thev gate 7) is moved to the position shown by broken linesyinAv Figure 2.,'to cut off the'flfow of material, the arm b1 of the lever b will strike the lever m1- and will cause it to move from 'soY the full line position of Figurel to thebroken v line position, thereby taking the detent m3 out of the pathV of movement of the stop L3 andV permitting the filling spout to swing in a counter-clockwise direction under the influence ofthe unbalanced weight of the bag and its contents. The Ysha-ft' axis of' the lever m1 is provided with an armm which cooperates with a stop J 7Vtol limit the movement of the lever. Y Y The gate o is moved from its closedA position, shown by broken lines .in Figure 2, to its open position shown by fullv lines in. that ligure against thetension of the spring b2, by a wire d. which connects the gate. with a lever e which ispivoted on the frame of the machine and has an arm-e-1 and an arme2. In theclosed position of thegate the end of the arm er1- overlies the end f2 ofia hand` lever f pivoted at f1 and .provided` with a spring which returns it toa position of rest. llhenV the empty bag has been placed' on the filling spoutas described, thelong arm of the-lever fis depressed and the shortarm, contacting with the-end! ofthe arm el, swings that arm and theleverfrom theposition shown by broken lines in Figure l to the position shown d by full linesthereby opening the gate b and The maj or partof the resetting,movementof the filling spout is effected bythe operator as soon as lie-has placedthe begin position on the spout. The cani-like coactlon ofthe detent and the stop completesthe,movement and locks the partsin .filling position. v

After the :filled bag. has been dislodged from` thel filling spout the counterbalance weightsY J 3 raise the suspensionrod;and` the partsconnected therewith, including the lill; ingspout, and'pull down the weight .rod J:

The latter carries a pin J7 Which, in the downward movement of the weight rod, contacts With the end h1 of a detent lever h, causing it to coact with a tripper arm g of a latch g1. The latter is arranged to coact With a yielding portion e3 of' the latch lever e2 and thereby hold the lever e and its connected parts in the position shown by full lines in Figure 1. rlhe detent 7L is acted upon by a spring 71,3 which, When the pin J7 of the Weight rod l is raised from the end h1 of the lever it, as the bag is tilled to the predetermined Weight, pulls down the corresponding end of the detent 7L, releases the tripper arm g and so edects the release of the arm e3 and lever e and permits the gate b to be closed by the action of the spring b2. A. spring g2 returns the arm g to position of rest against stop g3. rllhe movement of the gate to shut oil the iiow e'ects the release of the filling spout in the manner already described and the cycle ot operations is repeated. It Will be understood that when the hand lever f is pulled down the Wear plate f2 on the other end contacts with the arm el and swings it to the full line position as above described. The arm e2 is also swung to full line position and the yielding part e3 slips over the latch g1 so that the arm e2 is then held by the latch until it is again released by movement of the Weight rod as above described.

it will be understood that various changes in details of construction and arrangements can be made to suit diierent conditions of use and that, except as pointed out in the accompanying claims, the invention is not restricted to the particular construction shown and described herein.

l claim as my invention:

l. ln a bag filling machine, the combination ot a lilling spout adapted to support a bag to be filled, a balanced lever, a Weight rod hung from one end of said balanced lever, a suspension rod hung from the other end of said balanced lever, a supporting lever for the filling spout mounted on the suspension rod, a detent mounted independent-ly of the last named lever, a detent on the last named lever engaged by the first detent to prevent movement of said supporting lever, and means the operation of Which is initiated by the movement of the balanced lever to move the detent and permit the angle of inclination oin the spout to be changed with the movement of said lever.

2. In a bag filling machine, the combination of a bin having an outlet, and a pivotally supported filling spout, a pivoted detent to prevent movement of the spout, an arm carried by the detent, a gate to control the discharge oi' the material through the outlet, a balanced lever, means to support from one end of said balanced lever a bag to be filled, a Weight rod hung from the other end of the` balanced lever, means tending normally to close the gate, means operated by the closing of the gate to engage the detent arm to release the detent and filling spout, a lever operatively connected to the gate and having a detent arm, a detent to engage said arm and prevent movement of the last named lever, and means the operation of which is actuated by the movement of the Weight rod to move the detent to release the arm and lever and permit the gate to close.

Signed at London, England this 6th day of December, A. D. 1929.

KRISTIAN MIDDELBOE.

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