US2909969A

US2909969A - Bag forming and sealing machine

Info

Publication number: US2909969A
Application number: US741554A
Authority: US
Inventors: Henry H Styers
Original assignee: POLY CUT CORP
Current assignee: POLY CUT CORP; POLY-CUT Corp
Priority date: 1958-06-12
Filing date: 1958-06-12
Publication date: 1959-10-27
Anticipated expiration: 1976-10-27

Description

HM 76R oslr o/valz Oct. 27, 1959 Filed June 12, 1958 H. H. sTYERs 2,909,969

"c SERVICE SWIM/1'. i 9 //0-/z0 Mv L I L 2-Xsxzr 20 Ill Svwfcll Q: &5 5 8 5% v m 210..

Ill...

mus FORMER. -0 o 0- INVENTOR;

HAND Au-ro 4/ /sf 0 OR @777 575. 1/: 2; T 0 BY j j w M M #W W Oct. 27, 1959 Filed June 12, 1958 H. H. STYERS 2,909,969

BAG FORMING AND SEALING MACHINE 7 Sheets-Sheet 2 BY w; 4 5?? fi h Wig 0 M W flZZZrveys.

Oct/27, 1959 H. H. sTYERs BAG FORMING AND SEALING MACHINE 7 Sheets-Sheet 5 Filed June 12, 1958 INVENTOR.

flllllllll Oct. 27, 1959 H. H. STYERS BAG FORMING AND SEALING MACHINE 7 Sheets-Sheet 4 Filed June 12, 1958 INVENTOR. 3 W

Oct. 27, 1959 H. H. STYERS 2,909,969

BAG FORMING AND SEALING MACHINE Filed June 12, 1958 7 sheets-Sheet 5 vz l ya H. H- STYERS BAG FORMING AND SEALING MACHINE Oct. 27, 1959 7 Sheets-Sheet 6 Filed June 12, 1958 INVENTOR. BY 5%) 594/15.

Oct. 27, 1959 H. H. STYERS BAG FORMING AND SEALING MACHINE 7 Sheets-Sheet 7 Filed June 12, 1958 United States Patent C M BAG FORMING AND SEALING MACHINE Henry H. Styers, Chicago, Ill., assignor to Poly-Cut Corporation, Chicago, 111., a corporation of Illinois Application June 12, 1958, Serial No. 741,554

18 Claims. (Cl. 93-8) This invention relates to improvements in the manufacture of bags, or like containers and more particularly to improved apparatus for the high-speed production of open mouth bags in variable sizes from a web of polyethylene, or other similar flexible material, having a heat-fusible surface, wherein the web of material is fed to the machine as center fold material, or tubing, and bags formed therefrom by successive longitudinal edge sealing and severing operations.

The present invention does not include any steps directed to folding of a single web of material to form the center fold material used, or to steps for closing the open mouth of the bags after formation of side seals therto, as these operations may be accomplished by conventional mechanisms.

In the art of manufacturing bags, it has been standard practice to form elongated bag tubes, cut into desired lengths and thereafter to form bags therefrom by sealing the bottoms, but at least with certain types of stock, the sealing of the bottom of the bag has presented serious difficulties.

Also, it has been standard practice to provide an apparatus for the manufacture of bags which is adapted to advance the web intermittently, thereby allowing time for effective and positive sealing steps and which is also adapted to maintain tension upon the web at all times during the forming operations, whereby considerable time is lost in the production of the bags.

The prior art machines do not provide means for highspeed production of bags with a folded bottom, having definite and positive longitudinal side seals, nor is apparatus suggested which permits the production upon center fold material of a wide range of bags sizes, variable as to both width and height, and also variable as to a pro jecting lip portion at the mouths of the bag.

Accordingly, it is an object of this invention to provide a new apparatus for the manufacture of relatively air separate the newly formed bags, or containers, immediately after formation of same.

Another object of the invention is .to provide a machine with a heat sealing roll in contact with a movable belt, which, by means of simple gear changes andadjnstments,

. the speed of the heat sealing roll is varied in relation to the speed of the belt conveying the heat sealing material,

the variation of the speed of the heat sealing roll relative to the speed of the belt provides a wide range of bags sizes, variable as to both width and height.

Further objects and details will appear from the description of the invention in conjunction with the accompanying drawings, wherein:

2,909,969 Patented Oct. 27, 1959 Figure 1 is aside elevational view of a bag making machine embodying the present invention;

Figure 2 is a fragmentary front end view of the machine of Figure 1, with parts of the tension mechanism and roll of material in section;

Figure 3 is a fragmentary longitudinal sectional view taken on the line HIIII of Figure 5;

Figure 4 is a fragmentary longitudinal sectional view taken on line IVIV of Figure 2, the rear end portion broken away and placed in an elevated location;

Figure 5 is a fragmentary top plan view of the machine of Figure 1, parts removed, taken substantially on line V--V of Figure 4;

Figure 6 is a schematic diagram of the electrical circuit embodied with the machine of Figure 1; I

Figure 7 is a fragmentary elevational sectional view through the gear housing taken substantially on line VII VII of Figure 8;

Figure 8 is a fragmentary sectional view taken substantially on line VIII-VIII of Figure 7;

Figure 9 is a fragmentary sectional view taken substantially on line IX-IX of Figure 7;

Figure 10 is a fragmentary longitudinal sectional view of the heat sealing roll with center shaft and parts associated therewith; v

Figure 11 is an enlarged end view of one end of the heat sealing roll with some parts in'section;

Figure 12 is an enlarged end view of the heat sealing roll, opposite that shown by Figure 11, showing a four lobe cam attached thereto and the micro-switch being shown by dotted lines; v

Figure 13 is a fragmentary sectional end view of the sealing roll and cam taken substantially on line XIII- XIII of Figure 12.

In the drawing, the numeral 15 designates an elongated strip of thin flexible thermo-plastic sheet material, such as polyethylene. The elongated strip is unwound from roll 16 where it is arranged as a center fold material, or tubing if so desired. The roll 16, as best illustrated in Figure 2, is mounted upon a supporting and tensioning mechanism 17. The roll 16 of flexible material 15 is wound upon a hollow core 18 with flared ends. The tensioning mechanism is supported by the framework 20 enclosed inside the sheet. material cover C of the bag making machine 25. A shaft 21 is mounted transversely of the frame 20 upon a frame extension 22, shown by Figures 1 and 2, and journalled in bearings '23 and 24. Said shaft 21 embodies left and right handed threads, the left handed threads 26 at one end portion and the right handed threads 27 at the opposite end portion thereof. Supporting

arms

28 and 29 are threaded at their upper ends upon said shaft 21. The lower ends of said arms being apertured to receive a shaft 30. Two truncated cones 31 and 32 are mounted upon said shaft 30 with their smaller ends arranged for insertion within the hollow end portion of said core 18. The handwheel 33 is assembled and rigidly secured to one end of said shaft 21. The rolls 16 and core 18 are assembled upon the cones 31 and 32 which are loosely mounted upon shaft 39. Friction washers 19 are assembled between the cones 31 and 32 and the respective supporting

arms

28 and 29. By turning the hand-wheel 33 clockwise the

arms

28 and 29 move toward each other pressing the washer 19 against the cones 31 and 32 whereby they are pressed into the ends of said core 18 to regulate the desired tension of the material leaving the roll 16 mounted on said cones.

As the center fold material 15 is unwound from roll 16 it is fed over idler roll 35 rotatably mounted upon shaft 36 extendingtransversely of the frame 29, shown by Figures 4 and 5. The web 15 is fed downwardly and around an idler roll 37 rotatably mounted upon shaft 38 2,909,969 H p r and then upwardly and over an idler roll 39 rotatably mounted upon shaft 40. The web 15 is then fed horizontally beneath a feed compression roller 41 on shaft 42, and then upwardly between the feed roller 41 and the endless belt 45. Said shafts 36, 38 and40 are all suitably journalled in said frame 20 of the machine. The end portions of said shaft 42 extend through lateral slots 46 arranged in both sides of the frame 20. Square journal blocks 47 and 48 are mounted upon the ends of said shaft 42 and are assembled with the end portions of compression screws 51 and 52 extending rearwardly through threaded nuts 53 and 54 welded to the framework 20. A pair of hand wheels 55 and 56 are rigidly secured to the outer ends of said compression screws 51 and 52 to increase or decrease the pressure of the feed roller 41 upon the material 15 in running contact with the belt 45. The belt 45 withdraws the material 15 from roll 16 according to the pressure of the compression roller 41 biasing the material 15 into contact therewith.

When the pressure upon the material is relieved, the material is not withdrawn from the roll 16. The

rollers

35, 37, and 39 in rolling contact with the material as it travels thereabout remove all wrinkles and looseness of the material before it reaches and contacts the belt 45.

A motor 60 is adjustably mounted upon the lower portion of said frame 20, shown by Figure 4. A drive pulley 62 is mounted upon motor shaft 61. A driven pulley 63 is mounted upon the end portion of a trans- '20 and the near end of the shaft extends outside the machine frame as shown by Figures 3 and 5. A pinion gear 68 is secured to said shaft 67 and becomes the driving pinion for driving the intermediate spur gear 69 mounted on shaft 70, said intermediate gear 69 driving the gear 71 mounted on the near end of shaft 72, said shaft 72 extending transversely of the machine with its opposite end extending beyond the frame of the machine at the opposite side; said shaft 72 being journalled in bearings 58 and 59 for supporting and driving the belt drive roller R, shown by Figures 2 and 5. A spur gear '73 is mounted upon the far end portion of shaft 72 for driving gear 74 mounted upon stub shaft 75 arranged parallel with shaft 72, as shown by Figures 4 and 5. A floating shaft 75-A is assembled at one end thereof to an adjustment arm 81, pivotally mounted at one end to shaft 75, said shaft 75-A arranged parallel to said stub shaft 75 and having its free end extending outwardly beyond the end of shaft 75. A pair of pinion gears 76 and 77 are assembled upon shafts 75 and 75-A in mating relation with each other. Shaft 75 drives gear 76 which drives the gear 77, shown by Figures 7 and 8. Said gear.

77 is pinned to said shaft 75-A which drives a speed control gear 78 removably mounted upon the end portion of said shaft 75-A. Said gear 78 being locked upon shaft 75-A by a circular locking nut 88.

Directly above the shaft 72 is mounted in

suitable bearings

85 and 86 the shaft 80 for supporting the heat sealing roller S transversely of the machine. A speed control spur gear 79 is removably assembled upon the far end portion of said shaft 80 and clamped thereon by a threaded circular nut 83 screwed upon the extreme outer end of said shaft 80. The adjustment arm is moved upwardly to effect mating of the speed control gears 78 and 79 and then locked in place. The free end of said arm has a threaded stud-shaped bolt 87 secured thereto. A timing gear housing H is assembled to the rear side of the machine to completely cover said gears 78 and 79 and associated parts. A b19915 8g is secured to the frame of the machine and is formed with an arcuate slot 89 substantially vertically arranged therein, said block spaced from the wall of the machine to provide suitable space to permit movement of the enlarged head portion 90 of said stud-shaped bolt. Once the gears are in mating relation, the circular lock-nut 88 is screwed inwardly to lock the bolt 87 extending through the slot 89 with the inner wall of the block 82. When it is desirable to exchange gears of different size for gears 78 and 79, as will be explained later, the arm 81 is lowered to permit lowering and removal of gears 78 and 79.

The housing H is provided with a door 91 vertically arranged and hingedly connected thereto by hinges 92. At the side opposite the hinges 92 a locking means is provided embodying a locking pin 93. A safety switch 94 is assembled within the housing H with its operating member-95 extending outwardly and effected by the opening and closing of the door 91. If and when the door 91 is opened, the electric circuit is broken leading to the drive motor 60, as shown by Figure 6.

The endless belt 45 mounted to play over belt roller R extends rearwardly and in a downwardly inclined plane and about roller 74 mounted upon transversely arranged shaft 75 journalled in

bearings

76 and 77. The

bearings

76 and 77 are connected with tension rods 78 and 78-A and secured in place by locking nuts 73. Said belt 45 and rollers R and 74 encircled by said belt 45 are driven by said shaft 72.

The web 15 traveling between the roller R and sealer roller S is conveyed under feed roller arranged close to the belt and transversely of the machine frame 20. As shown by Figures 4 and 5 said roller 100 is rotatably mounted upon shaft 101 supported in the free end portions of bracket arms 102 and 103. The opposite ends of the bracket arms 102 and 103 are pinned to end portions of a shaft 104 mounted transversely of the machine and secured in journals 105 and 106 secured in brackets 107 and 108 secured to an angle bar 109 extending transversely of the machine and rigidly secured to the machine frame above the plane of the belt by side brackets 110 and 111. Said roller 100 is provided with a spiral groove extending from end to end thereof, the outer surface of the roller 100 being in pressing engagement with the web 15 upon the belt 45, the weight and pressure of the roller acting to keep the web 15 in contact with the belt for conveying the web to the jogger roll located at a distance from said roll 100.

The jogger roll 112 is rigidly mounted upon a shaft 113 arranged parallel with shaft 101. The shaft 113 is mounted in bearings 119 and in the free end portions "of the arms 114 and 115 which are mounted with their opposite ends thereof pinned to shaft 116, said shaft 116 being transversely mounted in the machine in

bearings

117 and 118 which are supported in the bearing

brackets

121 and 122. Said shaft 113 has a grooved cam 123 mounted upon one end thereof between the arm 115 and the frame 20. A depending pin the 124 is supported by a bracket 125 secured to the frame 20 adjacent and above said cam 123. The lower end portion of said pin 124 rides loosely in the groove of the cam 123 as the cam rotates due to rotation of said roll 112 and shaft 113, said shaft 113 and roll 112 are given an alternating transverse motion. Upon the opposite free end of shaft 113 is mounted a rather small sprocket 135. A sprocket 'transverse motion thereof effects a lateral motion to the severed web portion 15-A upon the belt 45 for purposes to be explained later.

Between the jogger roll 112 and the rear roll 74 supporting the belt 45 is arranged a high speed shaft 126 mounted in

bearings

127 and 128, said shaft 126 having

contact rollers

130, 131, 132 and 133 rigidly secured thereon and spaced at desired locations therewith. Said rollers 130-133 are adjustably secured to said shaft 126 by set screws 138. The bag sealing and severing mechanism 140 includes said shaft 81) and said sealing roller S vertically arranged above said shaft 72. Said sealing roller S is suitably supported upon said shaft 81 and comprises three

circular disks

142, 143, 144, two arranged to form the ends thereof, and one centrally located between said other disks. The disks are constructed of electrical insulation and heat resisting material.

Disks

142 and 144 are keyed to said shaft 80 by keys 145 in key-ways arranged in said shaft, as shown by Figure 11. The rotation of the gear 79 will rotate said shaft 80, the

disks

142, 143 and 144 and parts associated therewith. The

disks

142, 143 and 145 have a plurality of laterally arranged slots arranged therein. As shown by Figures 11 and 12, each disk is provided with four slots, 146, 147, 148, 149 with parallel side walls and equally spaced about the periphery thereof. At the base of each said slots is radially arranged a circular bore 154 with a cylindrical sleeve 151 arranged therein to surround a compression spring 152 assembled in each .of said bores 150. Said

disks

142, 143 and 144 are supported by the shaft 30 to further support the heat sealing and bag severing bars 153-156 as sembled in said slots 146-149, whereby they are ar ranged parallel and longitudinally with said shaft 80. Each of said bars 153-156 has a longitudinal bore 157 extending from end to end thereof. A cylindrical rod 158 is mounted in each of said bores 157 with threaded ends thereof extending beyond each end of said bars 153- 165. A commutator ring is arranged at each end of said sealing roll S, spaced therefrom only by washers 173. A commutator ring 169 with bifurcated radially extending arms 171 is rigidly secured to one end of each of said bars 153-156 by nuts 172 arranged upon the threaded ends of said rods A commutator ring 170 is similarly arranged at the opposite end of said bars 153-156 by nuts 172.

The heat sealing bars 153-156 have parallel longitudinal side walls 185 and 136 and a flat base 134 formed at right angles to said side Walls. The outwardly extending working portion of each bar has an inverted V shaped surface 188 with a narrow longitudinal sealing edge portion. The heat sealing bars 153-156 are normally held within the slots 146 by bar 15% and nuts .172. Adjacent each of said bars and formed with each slot in the

end disks

142 and 144 is provided 'a cavity 196. Each bar has a small recess 189 in its side wall adjacent the cavity in the associated slot. A resilient spring 191 having a depending portion 192 is secured at its upper end 193 within each of said cavities, its lower free end 192 projecting into said recess in the bars. When'it is desired to remove one or more bars ,to make bags of larger diameter, the nuts 172 are loosened, the spring 191 in the adjacent cavities 190 are depressed and the bar withdrawn with the assistance of the compression spring .152 in contact with the base of the bar.

The commutator rins 159 and 170 are also secured to the respective supporting

disks

142 and 144 by suitable [screws 175, as shown by Figure ll.

Adjacent the commutator rings 17% and suitably spaced therefrom is a four lobe earn 175 with a central aperture '177 to allow said shaft 80 to extend therethrough, clearly .shown by Figure 12.

sealing roller S. Said brackets support brushes, or pins '182 and 183 resiliently mounted horizontally therewith so that the free outer ends thereof frictionally engage the commutator rings 169 and 170. Pin 18?. is electrically 6 a connected to one line of an electric circuit and pin 183 is connected to the opposite line of the electriccircuit. The current traveling through the bars 153-156 will produce sufiicient heat, at or about 600 F., to effect heat sealing and heat severing of the multiple layer bag operated upon. As shown by Figure 4, the heat sealing roller S is shown slightly elevated above the belt 45 running over belt drive roller R. The shaft is journalled in bearings and 86 which are resiliently and adjustably mounted in vertical guides 56 and-57 in the upper portion of the sides of the frame 20. Said

bearings

85 and 86 rest upon the upper ends of

coil springs

43 and 44 which are mounted upon the upper sides of bearings 58 and 59, respectively. The adjusting screws 96 and 97 are threaded into the upper ends of the frame standards and the

bearings

85 and 86 are moved upwardly by the

screws

96 and 97 when turned in one direction and when the screws are turned in the other direction, the

springs

43 and 44 are compressed and the

bearings

85 and 86 are lowered, whereby the sealing roller S is adjusted upwardly or downwardly with relation to the belt roller R.

The shaft 275 and roller 274, and the shaft 72 and belt drive roller R are mounted in substantially a horizontal plane, as shown by Figure 4. Due to the fact that the roller 274 is smaller in diameter than the roller R, the plane through which the belt travels is inclined downwardly from the roller Rto roller 274. This inclination is very important and will be explained later. I

Three main control buttons are mounted with switches upon the frame of the machine, a start button and switch 210, a stop button and switch 211, and a selector button and switch 215. The selector switch is turned between hand operated station HO and automatic station A. i

.In order to use four sealing bars as shown in the draw ings, a four lobe cam 17 6 is shown and is secured to the end of the sealing roller disk 144 by screws 200, the lobes of the cam are designated by numeral 201, 202, 203 and 204. When power is applied by the motor 60, the sealing roller S is rotated, and it is important that the roller S never stop with a sealing bar in contact with the web material or belt on the roller R. Therefore, a microswitch 205 is secured upon the frame 20 by suitable means, as shown by Figures 4 and 12. Said microeswitch 205 has embodied therewith an actuating arm 206 with I idler 207 upon the outer end thereof. .Any one of the lobes of the cam 1456 will strike the roller 207, move the arm 266 which closes the micro-switch 205, allowing current to travel through the electrical circuit as long as the lobe of the cam holds the arm in circuit closing position. Since the lobes are in radial alignment with the sealing bars, the sealing bars will always travel to a location and stop at a location relative to and intermediate the lobe positions of the cam 176. Therefore, each time the power is transmitted by pressing the starting button 210 the sealing bar will rotate one quarter of a revolution. A stop switch actuated by stop button 211 is inserted within the circuit to cut off all current and stop the rotation of the sealing roller S. Two additional switches, a selector switch 215, and an inching switch 212 are mounted adjacent the stop switch 211 and the start switch 210. When the inching switch 212 is actuated by pressing upon plunger 214 the power will be applied and the machine will run continuously if the selector switch 215 is in automatic position or it will allow the machine to stop if selector switch is in hand control position and the plunger released. The inching switch 212 acts as a starting switch when selector switch is in automatic position. When the stop button 211 is depressed the micro-switch 205 will again function and it governs the location of the sealing bars when the roller S stops rotating.

The operation of the machine is as follows: The bag material is drawn from the roll 16 thereof and fed over roller 35, under roller 37, over roller 39, between compression rollers 41 and belt roller R, between the belt 45 playing about roller R and the sealing roller S along the top of the belt 45 under feed roller 100. When the machine is 'placed in operation by depression of the starting button 210 the formed bags leaving the sealing and severing roller S will travel along the belt andunder the jogger roller 112, along the belt, and under the high speed rollers 130-134, whereby the formed bags are ejected onto conveyor 220. Said conveyor is constructed with two shafts 221 and 222 at the forward end and two shafts 223 and 224 at the rear end thereof, one above the other. The conveyor unit is driven by a separate power unit not shown, a belt 25 drives a sprocket 226 which drives shaft 224 in a counter-clockwise direction and said shaft 224 driving shaft 223 in a counter-clockwise direction by pinion gears engaged with each other and secured to said shafts 223 and 224. Conveying means, as for example endless spiral springs, are mounted upon pulleys mounted upon the front and rear shafts, whereby the completed bags are conveyed to the end thereof and discharged from the conveyor unit.

With the sealing roller equipped with four sealing and severing bars and the gears 78 and 79 within the housing H of such a combined gear ratio that the speed of rotation of the sealing roller S is the same as the speed of rotation of the belt roller R, four bags will be formed during each revolution of the sealing roller S. The width of each bag will be exactly A the circumference of the sealing roller. By changing the gear-ratio between the gears 78 and 79 the speed of rotation of the sealing roller S will be varied with relation to the speed of the film traveling along the belt 45 over the roller R. By turning the lock nut 88 to relieve the pressure upon the adjustment arm 81, said arm can be lowered thereby separating said gears 78 and 79 and permitting the removal and substitution of gears of a different gear-ratio. The down ward slope of the belt permits a gear ratio variation of 10% between the gears 78 and 79 without any destruction, or sliding action of the bars upon the bag material, in other words the width of the bags can be increased or decreased l% with the same number of sealing bars. The inclination of the belt shortens the length of time of .contact between the heating bars and the bag material upon the belt. The inverted shape V heating surface of the bars being provided with the narrow longitudinal seal edge effects sealing of the layers of material together and severs the adjacent portions thereof, thereby providing sealed edges to the adjacent bags. A increase .or decrease, will allow an increase, or decrease, of 1" in the width of the bags formed by a sealing roller S with a fifteen inch diameter.

When it is desired to make a bag twice the width as obtained when using four sealing bars, two of the bars vsuch as 153 and 150, spaced at opposite sides of the sealing roller S can be removed by removal of the nuts 172 from the rods 158, removal of the washers 173 between the commutators 169 and 170 and the

bars

153 and 155,

then complete removal of the rod 158 and finally the depression of spring 191 whereby the springs 152 will force the bars outwardly. Should a bag be desired with a width four times the original width with a four bar sealer, then three of the bars can be removed; and an additional variation of one inch, or about 10%, can be ,made by changing the size of the speed control gears 78 and 79.

Should it be desired to make several bags of a shorter length, and at the same time, the roll 16 can be made of less width, and several rolls be placed in alignment upon the supporting shaft 21, and the several webs of the safety switch 95 breaking the circuit and preventing .any power from being applied to the machine by motor 60. For further protection, a service switch 216 and a .reset-switch 217 are installed ahead of the switch box enclosing the

switches

210, 211, and 215, as shown by Figures 1 and 6 of the drawings.

Should the speed of the power unit need to be changed for reasons of production, the speed of the pulley 63 can be changed with relation to the speed of the motor shaft 61 by turning the handle 227 of the Reeves Speed Control device 228 supporting the motor 60 upon horizontal rods 229 mounted with the machine frame 20.

The above description has been chosen with relation to center fold material for making bags with a closed lower end and sealed side walls and open upper end. It is obvious that tubular material may be used to form vbags closed at both ends with sealed side edges; the bags .its closed tubular side walls, providing two webs of material to be fed through the machine and constructing two bags at one time with closed ends, sealed side walls and the length desired.

It will be understood that while I have illustrated and described one embodiment of my invention, I do not wish to be limited to this precise structure as obviously various modifications and changes may be made therein without departing from the spirit and scope of my invention.

I claim as my invention:

1. A bag machine as described, including means for supporting a roll of bag-making web material with a center fold to form a bag, an endless belt extending about a drive roller and a driven roller, roller means for pressing 'a portion of said web material into contact with said belt adjacent said drive roller, a sealing roller mounted about said drive roller for contacting web material in contact with said belt, said sealer roller having a plurality of spaced sealing bars for sealing and forming the sides of the bag, roller means for retaining the bags upon the moving belt in juxtaposition, a jogger roll in rolling contact with said formed bags on the belt for applying transidrive roller and severing roller are power operated by an electric motor, and embodying a microswitch operated by a cam assembled adjacent said sealing roller, the actuation of said switch by said cam effecting the closing of the electric power circuit connected with said motor, the microswitch controlling the location of the bars when idle so they do not stop in contact with the belt.

4. A bag machine according to claim 1 wherein said drive roller and said sealing roller are power operated by an electric motor, said motor mounted upon an adjustable base effecting the speed of the belt drive associated therewith, and embodying a pair of speed control gears enclosed in a housing with a door, a safety switch embodied between said door and said housing whereby opening of the door will break the electric power circuit.

5. A bag machine according to claim 1 where the driv roller and said sealing roller are power operated by an electric motor, said motor mounted upon an adjustable base effecting the speed of the belt drive associated therewith, and embodying a microswitch operated by a cam assembled adjacent said sealing roller, the actuation of said switch by said cam effecting the closing of the electric power circuit connected with said motor, the microswitch controlling the location of the bars when idle so they do not stop in contact with the belt.

6. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, an endless belt extending about a drive roller and a driven roller, roller means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a sealing roller mounted above said drive roller for contacting web material in contact with said belt, said sealer roller having a plurality of spaced sealing bars for sealing and forming the sides of the bag, a jogger roll in rolling contact with said formed bags on the belt for applying transitory motion to said formed bags thereon, and roller means for ejecting the formed bags from the machine.

7. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, an endless belt extending about a drive roller and a driven roller, roller means for pressing a portion of said web material into cont-act with said belt adjacent said drive roller, a sealing and severing roller mounted above said drive roller for contacting web material in contact with said belt, said sealer roller and severing roller having a plurality of spaced common sealing and severing bars for sealing and forming the sides of the bag and for severing the bags, roller means for re taining the bags upon the moving belt in juxtaposition, a jogger roll in rolling contact with said formed bags on the belt for applying transitory motion to said formed bags thereon, and roller means for ejecting the formed bags from the machine.

8. A bag machine as described, including means for supporting a roll of bag-making web material to form a bag, an endless belt extending about a drive roller and a driven roller, means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a sealing and severing roller mounted above said drive roller for contacting web material in contact with said belt, said sealer and severing roller having a plurality of spaced unitary sealing and severing bars for sealing and forming the sides of the bag and for severing the bags by heat, roller means for retaining the bags .upon the moving belt in juxtaposition, a jogger roll in rolling contact with said formed bags on the belt for applying transitory motion to said formed bags upon said' belt, and roller means for ejecting the formed bags from the machine.

9. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, an endless belt extending aboutz a drive roller and a driven roller, means for pressing a' portion of said web material into contact with said belt adjacent said drive roller, a sealing roller mounted above said drive roller for contacting web material in contact with said belt, said sealer roller having a plurality of spaced sealing bars for sealing and forming the sides of the bag, a common power means for driving said drive roller and a pair of speed control gears, said speed control gears driving said sealing roller, the gear-ratio of said gears determining the speed of rotation of said sealing roller relative to said belt, roller means for retaining the bags upon the moving belt in juxtaposition, a jogger roller in contact with said formed bags on the belt for applying transitory motion to said formed bags thereon, and means for ejecting the formed bags from the machine.

10. A bag machine according to claim 9 and having said pair of speed control gears enclosed in a housing with a door, one of said speed control gears movably mounted upon an arm pivotally mounted at one end and adjustably secured at its opposite end with a bolt secured in a block attached to the machine, said block having a curved slot therein and within which said locking bolt is movable to engage or disengage said speed control gears with each other, a safety switch embodied between said door and said housing whereby opening of the door will break the electric power circuit.

11. A bag machine according to claim 9 and having one of said speed control gears movably mounted upon an arm pivotally mounted at one end and adjustably secured at its opposite end with a bolt sliding in a block 10 Y attached to the machine, said block having a curved slot therein and within which said locking bolt is movable to engage o-r disengage said speed control gears with each other, a microswitch operated by a cam assembled adjacent said sealing roller, the actuation of said switch closing the electric power circuit, the microswitch controlling the location of the bars when idle so they do not stop in contact with the belt.

12. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center to form a bag, an endless belt extending about a drive roller and a driven roller, means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a sealing and severing roller mounted above said drive roller for contacting web material in contact with the belt thereon, said sealer and severing roller having a plurality of common radially spaced and removable sealing and severing bars for sealing and forming the sides of the bag and for severing the bags, power means for driving said drive roller and a pair of speed control gears, said speed control gears driving said sealing and severing roller, said speed control gears removable and replaceable, the gear-ratio of said gears determining the speed of rotation of said sealing roller relative to said belt, roller means for retaining the bags upon the moving belt in juxtaposition, a jogger roller in contact with said formed bags traveling on the belt for applying transitory motion to said formed bags thereon, and roller means for ejecting the formed bags from the machine.

13. A bag machine as described, including means for supporting a roll of bag-making Web material to form 'a bag, an endless belt extending about a drive roller and a driven roller, means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a heat sealing and severing roller mounted above :said drive roller for contacting Web material in contact with said belt, said sealer and severing roller having a plurality of spaced common heat sealing and heat severing bars for sealing and forming the sides of the bag and ,for severing the bags, power means for driving said drive roller, a pair of speed control gears connected with said fpower means, said gears driving said sealing and severing :roller, the gear-ratio of said gears determining the speed ,of rotation of said sealing roller relative to the speed of 'the material traveling on said belt, roller means for retaining the bags upon the moving belt in juxtaposition, a

,jogger roller in contact with said formed bags. traveling with said belt for applying transitory motion to said formed bags, and means for ejecting the formed bags from the machine.

14. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, a drive roller, a driven roller, an endless belt extending about said drive roller and said driven roller, means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a sealing and severing roller device mounted above said drive roller for contacting the web material in contact with said belt, said sealing and severing roller device embodying a plurality of spaced heat sealing and heat severing bars, said bars being supported by and removable from said'sealing and severing roller device, an electric motor for driving said drive roller, a pair of speedrcontrol gears mounted between said motor and said sealing and severing roller, the number of bars upon said sealing roller and the gear-ratio of said speed control gears determining the width of the bag, roller means for retaining the bags upon the moving belt in juxtaposition, a jogger roll in rolling contact with the formed bags on the belt for applying transitory motion to the formed bags thereon, and roller means for ejecting the formed bags from the machine.

15. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, a large drive roller, a small driven roller, an endless belt extending about said drive roller and said driven roller, the upper surface of said belt running in a downwardly extending plane with reference to the horizontal, means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a heat sealing and severing roller unit mounted above said drive roller and in contact with the web material on the belt, said sealing roller unit embodying a plurality of spaced sealing and heat severing bars, said bars being supported by and removable from said sealing and severing roller unit, an electric motor and electric current from a suitable circuit for driving said drive roller, a pair of speed control gears mounted between said motor and said sealing and severing roller, the number of'bars upon said sealing roller and the gear-ratio of said speed control gears determining the size of the bag, said bars heated by electric current conveyed by said suitable circuit, said speed control gears mounted within a closed housing embodying a door, a safety switch closed by said door when in closed position, the opening of said door opening said safety switch preventing operation of the motor, a jogger roll in rolling contact with the formed bags on the belt for applying transitory motion to the formed bags thereon, and roller means for ejecting the formed bags from the machine.

16. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, a drive roller, a driven roller, an endless belt extending about said drive roller and said driven roller, adjustable roller means for pressinga portion of said web material into contact with said belt adjacent said drive roller, a heat sealing and heat severing roller unit mounted above said drive roller and in contact with the web material on the belt, said sealing roller unit embodying a plurality of spaced heat sealing and heat seven'ng bars, said bars being supported by and removable from said heat sealing and severing roller unit, an electric motor connected with an electric circuit for driving said drive roller, a pair of speed-control gears arranged in the power drive between said motor and said sealing and severing roller unit, said gears mounted in a housing attached to said machine, said housing having an entrance door, a safety switch actuated by said door, opening of said door breaks the circuit furnishing current to said motor thereby preventing operation of the machine when the door is open, the number of bars upon said sealing roller and the gear-ratio of said speed control gears determining the width of the bag, said bars heated by electric current conveyed by said electric circuit, roller means for retaining the bags upon the moving belt in juxtaposition, a jogger roll in rolling contact with the formed bags on the belt for applying transitory motion to the formed bags thereon, and means for ejecting the formed bags from the machine.

17. A bag machine as described, including means for supporting a roll of bag-making web material formed with a center fold to form a bag, a drive roller, a driven roller, an endless belt extending about said drive roller and said driven roller, the upper surface of said belt operating in a downwardly inclined plane with respect to the horizontal, adjustable roller means for pressing a portion of said web material into contact with said belt adjacent said drive roller, a heat sealing and heat severing unit mounted above said drive roller and in contact with the web material on the belt, said sealing roller unit embodying a plurality of spaced heat sealing and heat severing bars, said bars being removably supported with said heat sealing and heat severing unit, an electric motor and drive means connected with said drive roller, an electric circuit controlling said motor, a pair of speedcontrol gears arranged with the power drive means between said motor and said drive roller, said gears driving said heat sealing and heat severing roller, a selector switch mounted adjacent said heat sealing and heat severing roller and operated thereby, said selective switch governing the inoperative location of the bars to prevent same from stopping in contact with material on said belt, the number of bars upon said sealing roller and the gearratio of said speed control gears determining the width of the bag, roller means retaining the bags upon the moving belt in juxtaposition, a jogger roll in rolling contact with the formed bags on the belt for applying transitory motion to the formed bags thereon, and means for ejecting the formed bags from the machine.-

18. A bag machine as described embodying a heat sealing roller and a plurality of heat sealing bars, a motor, a microswitch operated by a cam assembled adjacent said sealing roller, the actuation of said switch by said cam efiecting the closing of the electric power circuit connected with said motor, the microswitch controlling the location of the bars when idle so they do not stop in contact with the belt.

References Cited in the file of this patent UNITED STATES PATENTS Willersdorf Sept. 5, 1916