US2275976A - Folding, sealing, and cutting mechanism - Google Patents

Description

March 10, 1942. H. A. MEAD FOLDING, SEALING AND CUTTING MECHANISM 5 sheets-sheet 1 Filed June 24, 1940 March 10, 1942. H. A. MEAD 2,275,976 I FOLDING, SEALING AND CUTTING MECHANISM Filed June 24, 1940 3 Sheets-Sheet 2 '9 BINVENTOR. BY cum 4 Thea ATTORNEY.

March 10, 1942. H. A. MEAD FOLDING, SEALING AND CUTTING MECHANISM 3 Sheeis-Shee; 3

Filed June 24, 1940 INVENTOR.

Patented Mar. 10, 1942 1 2,275,976 FOLDING, SEALING, AND CUTTING MECHANISM Harry A.

Mead, Glendale, Calif., assignor to Modern Containers, Inc., Los Angeles, Calif., a corporation of California Application June 24, 1940, Serial No. 342,099

2 Claims.

My invention relates to that class of machineryused in connection with the manufacture of bags, and particularly to bags made of Cellophane or other similar materials. Various machines have been designed for this class of production, and my invention includes an improved mechanism for the manufacture of such bags.

The purposes of my invention are as follows:

1st. To provide a means for forming and sealing the sides and bottom of such bags.

2nd. To provide means for forming a reinforcement in the bottom seal.

3rd. To provide a cushioned heating mechanism for sealing the side of the bag.

4th. To entirely complete the bag and then cut it off from the continuous strip of material being folded and sealed.

1 illustrate my invention by means of the accompanying drawings in which similar numbers refer to similar parts in the several views. Figure 1 is a diagrammatic view showing the method of feeding the material into the machine through the side-folding and sealing mechanism, and the relative location and arrangement of the revolving heads, which carry the bottom folding, sealing and cutting-cit mechanism. Figure -2 is a sectional view through the-bag, with the folds separated to better illustrate the electrically heated side-sealing mechanism. Figure 3 is a front elevation of the machine. Figure 4 is an enlarged sectional view of the gripper and sealer in the open position, with the tucker and cutting off knife in position to fold and cut off the finished bag. Figure 5 is an enlarged sectional view of the gripper and sealer in its closed position. with the bag between them being electrically sisting pad or cushion I9,

heated, sealed and cut ofi. Figure 6 is a sectional end view of the upper and lower headers, partly diagrammatic, taken on the line 5 -6 of Figure 3, and showing the tuckers and cutterbars, as well as the bottom sealer in their preliminary position. Figure 'l is a similar sectional end view, partly diagrammatic, of the upper and lower headers with parts of each broken away to more clearly illustrate the action of the tucker and the cutting-off knife, which are shown in their operating position. Figure 8 is asimilar' sectional end view, partly diagrammatic, of the upper and lower headers with parts of each broken away to more clearly illustrate the bottom sealing operation with the gripper closed and holding the bottom of the bag between the gripper and the hot sealing anvil. Figure 9 is a similar sectional end view, partly diagrammatic,

of the upper and lower headers with parts broken away to more clearly illustrate the opening of the gripper and the discharge of the bag, after having been cut off as shown in Figure '7. Figure 10 is a plan view of one of the lower headers withoutthe associated parts. Figure 11 is a front elevation of one of the lower headers, and

Figure 12 is an end view of one of the lower headers.

Similar numerals refer to similar parts in the 7 several views.

uppermost. This curling process is aided by the rolls 6 which have their axes set on converging angles, and which by their rubber or other friction covering, draw the twosides' toward each other; the degree of bag width and the amount of curl being determined by the angle to which these draw rolls 6 are set, and by the shape ofthe forming plate 25. The material also passes under the drag-rolls l, which have their axes set" at right angles to the direction of material move-' ment. These drag-rolls Tare also covered with iriction material which will insure their dragging effect on the bag material. The material 3 as it is drawn forward now has its two edges overlapping each other and lying fiat along the center, forming the tube 8. Between the rolls 6 and the rolls 1 is an electrically heated roll 9, and under this roll and also under the tube 8 is a heat rewhich provided a resilient support to the tube 8 heat applied to the seam 5. The resilience of the pad l9 insures a more perfect contact and a more perfect seal of the seam 5. After being sealed into a tube 8 the bag material 3 passes between the upper header l3 and the lower header-H where the bag is completed. The'machine can be driven by any convenient means, such as the motor l5, driving the pinion J2 and this pinion in; turn driving the rolls 1 by means of the" gears II. The header gears l3 and I4 are also driven from this motor,

naled in the frame 1-,. and on which the header itself is mounted, being secured thereto by set screws, and has two discs I! and it. The gear.

the anvil against which the bottom of the bag is pressed when being sealed. These bars [9 are provided with cavities adapted to contain electrical heating elements 29 which are connected with a source of electric power by leads extending from the heating elements through an opening in the shaft l6. Each of these leads ,con-

as it is sealed by the through the pinion l2. The lower header consists of a shaft l6 jour-' nects with the collector rings 2| and 22, which are insulated from the shaft l6 and are provided with suitable brushes, which in turn are connected with a source of electrical power. Along the length-of the anvil bars [9 are slots each of which contains a striking bar 23, against which a knife is pressed when cutting off the finished bags. These striking bars are held in their proper position by suitable means such as the set screws 24. Journaled in the disc i1 and ex-' tending through and beyond the disc l8 are the cam-shafts 30. Located between the two discs and secured to the cam-shafts 30 are grippers 3| which are adapted to be opened andclosed by the partial rotation of the said cam-shafts, the degree of the rotary movement of the cam-shafts and of the grippers being governed by the cams 25 which are stationary, being on a sleeve 56 attached to the frame i. On the extension of the cam-shafts 30 beyond the discs It there are secured to each cam-shaft a lever arm 21, having joumaled on its outer end a cam-roll 32 adapted to revolve with the header and ride on the cam 26. 4 The cam-rolls 32 therefore run'around the cams and the grippers are held in a normally closed position by means of the springs 29, but are opened at the pre-arranged time according to the shape and the timing of the said cams. The faces of the grippers 31 have a recess 34 at their inner portions, to aid in forming a reinforcing-ridge across the bottom of the bag being sealed.

The upper header has two discs 40 and 41 very similar to those of the lower header and has the driving gear l3 attached to the disc 40. The header is also secured to a shaft 42, this shaft being joumaled in cross heads 43, these being slidably mounted in the frame I. Beneath the cross-heads 43 are springs 44 adapted to hold the cross-heads against the adjusting screw 33. Between the discs 40 and 4| and integral therewith are the knife bars 46. These bars have longitudinally disposed across their outer faces, slots adapted to hold the knives 45, these being provided with adjustable backing strips 41. The knives 45 are adjusted to a preferred position, projecting slightly beyond the face of the bars 46. The knives 45 and the backing strips 41 are secured in position by suitable means such as the set-screws 48. Journaled in the disc 40 is one end of the cam-shaft 49, the opposite end extending through the disc 4! and having secured on its outer end the lever arm 50. These lever arms have journaled in their outer ends the cam-rolls 52. These cam-rolls revolve around the cams and cause the partial rotation of the cam-shaft 49. Along one side or within slots in the knife-bars 46 are tucker-blades 53. These blades are so constructed as to be moved into positions, either projecting out beyond the header or withdrawn within or flush with the face of the said knife-bars. These blades 53 are actuated by lever arms 54 which are secured to the cam-shafts 49 and are connected to the tucker blades 53 by the links 55. The degree of partial rotation of the cam-shaft 49 and also the degree of movement of the tucker blades 53 is governed by the shape and timing of the cams 52, the said cams being carried on sleeves 55 attached to the cross-head 43. The tucker blades 53 are normally held in their withdrawn. position by the springs 51.

The operation of the machine is as follows:

.The bag material is fed over a forming plate 25 and thence under side-folding and drawing rolls 6, which fold the edges of the material so that a side seam is uppermost and overlapping. The material then passes between the electrically heated roll 8 and the cushion or pad Ill. The purpose of the pad is to provide a resilient support insuring perfect contact and a perfect seam 5. The material is now in tubular form 8, with the side seam, sealed. The material feeding mechanism consists of the drag rolls I actuated by the gears I l, they in turn being driven by the motor 65 and the pinion I 2. The material then passes to the machine proper and is fed between a lower and an upper header, each revolvably the folding blade 53 opposite the opening between the open gripper-bar 3i and the anvil I3, and the cams of the upper header project the blade 53 into the V-shaped opening, carrying the material with it. The folding blade is then withdrawn and the gripper-bar 31 is closed, pressing the V-shaped bottom of the bag against the hot anvil l5, and thus sealing the bag. As the headers rotate, the knife 45 presses against the striker-bar 23 and severs the completed bag from the material, and the bag is then discharged from the machine.

In the drawings there are shown two duplicate sets of folding, sealing and cutting mechanisms.

' the path of the bag forming material, a resilient cushion in operative position with respect to said roller, means whereby the bag forming material is folded and sealed on itself, and a cutting member for severing the formed bag from the strip of bag forming material after the material is folded upon itself and sealed.

- 2. A bag forming machine comprising in combination, bag material holding means, folding means whereby adjacent edges of the bag material are folded in overlapped relation with each other, an electrically heated roller mounted in the path of the bag forming material, a resilient cushion in operative position with respect to said roller, means whereby the bag forming material is folded and sealed on itself, and a cutting member for severing the formed bag from the strip of bag forming material after the material is folded upon itself and severed. the bag forming material being heated across the area of severance prior to the formed bag being severed from' the material.

HARRY A. MEAD.

Images