US1571983A - Paper-bag machine - Google Patents

Description

Feb. 9,1926. 1,571,983

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BAPER BAG MACHINE Filed oct. 24, 1925 16 Sheets-sheet '16 .nlilillnn HHHIIH PatentedvFeb. 9, 1926.

UNITED STATES PATENT OFFICE.

HERMAN G. WEBER, or MARINETTE, WIsooNsIN, AssIGNoR or ONE-Ham". 'ro AMERI- CAN LAKEs PAPER coMPAny, or CHICAGO, ILLINoIs, A CORPORATION or DELA- WARE. V

PAPER-BAG MACHINE.

Application ined october* 24, 1923. semi m. 670,433.

To all whom it may cancer/n: o

Be it known that I, HERMAN G. WEBER, a citizen of the United States, and a resident of Marinette, in the county of Marinette and State of Wisconsin, have invented certain new and useful Improvements in Paper-Bag Machines, off Which the following in a specification. f

This invention relates to m'achines for the manufacture of paper bags of the auto-l matic or self-opening type and has forits primary object to provide a machine of'this class Which may be effectively operated at high speed.

Further objects of my invention are to provide a machine in which all movements are rotary, to eliminate pressure on the tucks during the bag forming operation, to provide a machine Which iscapable of handling all Weights and grades of paper, to provide grippers Which 'are self-adjusting, to apply the paste before the bottom is tucked, to Y provide an improved construction and arrangement of draw rolls, to provide'an improved tuck opening mechanism, to enable .different sizes of bags to be made on the same machine, to eliminate' the necessity vof using pins to open the bottom of the bag, to provide an improved guiding means for the blank, to provide an ,improved lip cutter, to provide an improved mechanism for severing the -bag blanks from the formedV tube, to

. provide an improved mechanism for transferring the blank from the severing rolls to the scoring rolls, to permit the use of the same scoring rolls on all sizes of bags, to provide an improved form of lip gripping mechanism, to provide an improved mecha- `nism for ironing the side flaps, to provide an improved mechanism for applying paste to ,the botto'm of the bag, to provide an impreved arrangement of the parts and particularly of the tucking device, to provide an improved back flap-turning device, to provide an improved means for quickly adjusting the machine for different sizes of bags, and to present the bags to the grippercylinders tangentially. The many other objects and advantages of my invention Will be better understood by reference to the following specification when considered in connection With the accompanying drawings illustrating a selected em- Fig. 5 is a transverse section on the line' 5-5 of Fig. 2.

fliig. -6 is a detail section on the 'line 6-6 0 `i0f. 5.'

Figii` 7 is a detail view of ,the slitting mechanism.

Fig. 's isa detail section dn the line 8-8 of Fig. 7.

Fig. 9 is a transverse section on the line 9-9 of Figs. 1 and 2. Fig. 10 is a detail section on the line 10 10 of Fig. 9.

Fig. 11 is Va transverse section on the line 11-11 of Figs. 1 and 2.

Fig. 12 isa transverse section on the line 12-12 of Fig. 2.

Fig. 13 is a detail view of a'severing roll.

Fig. 14 is a transve'rse section on the line 14-14 of Fig. 13.

Fig. 15 is a detail view of a portion of the' mechanism for operating the severing roll. Fig. 16 is a transverse sectiomon the' line 16-16 of Figs. 1 and 2.

plan view of a portion of the Fig. 17 is a detail plan view of the tuck opening mechanism.

Fig. 18 is a detail sectional view showing the tuck opening mechanism in side elevation. Figs. 19 and. 20 are detail sectional views on the lines 19-19 and 20-20 respectively of Fig. 17.

Fig. 21 is asection on the line 21-21 of Fig.

Fig.'22 is a detail. transverse section of the scoring roll. b

Fig. 23 is a detail elevation of the scoring rolls.

Fig. 24 is a transverse section on`the line 24--24 ofFig. 4..

' Fig. 25 is a transverse section on the line 25-25of Fig. 2.

Fig. 26 is a transverse section on the line 26-26 of Fig. 2.

Fig. 27 is a transverse section on the line 27-27 of Fig. 2. i

Fig. 28 is a'ftransverse ``section on the line 28-28 of Fig. 2.

' tom formino' Figs. 29 and 30 are detail sectional views on the lines 29-29 and 30-30 respectively of Fig. 25.

Fig. 31 is a vertical section on the line 31-31 of Fig. 25.

Fig. 32 is a section on the line 32-- Figs. 25 and 34.

Fig. 33 is a detail view, partly in section, of the upper opening roll.

Fig. 34 is a section on the line 34--34 `Vof Fig. 31.

Fig. 35 is a section on the line 35 35 of Fig. 31.

Fig. 36 is a section on the line 36-36 of Fig. 33.

. vention which I have chosen to illustrate the principles of construction and mode of eperation, the mechanism is mounted upon a bed of suitable type having supporting legs 61 secured thereto. The supply of paper is carried on the usual roll 62 mounted in hrackets 63 at the end of thebed. The

paper 64 is drawn through suitable printing mechanism 65 to the mechanism 66 where a supply of paste is applied to one edge prior to the formation of the tube u on the usual former or mandrel 67. The si e portions of this strip are folded inwardly over the former by the infolding mechanism and the tube longitudinally tucked in the manner customary in this type of bag. As this portion of the mechanism is well known in the art and forms no part of the present invention, it will not be described in detail. i

The formed tube is drawn through slitting mechanism, a-t 68, by rolls, at 69, and advanced to severing mechanism at 70. The severing mechanism in the present embodimentcompletely severs the 'individual bag blanks and these blanks are successively conducted to scoring mechanism at 71 by transfer rolls at 72. Upon leaving the scoring mechanism the bag is presented to the botmechanism, at 73, which completes the bag by successive steps in the manner to be presently described. s The completed bag is discharged. upon a conveyor, as at 74, (Fig. 2) and conducted to suitable stacking mechanism. i

The elitting mechanism. The islitting mechanism, at 68, is operated from the main driving shaft and is disposed above and below the tube former or mandrel 67. Upper and lower rotary shafts 81 and 82 respectively are mounted in supports 87 bolted to the bed. The shaft 82 is provided With fixed bearings 83, whereas the bearings 811 of the shaft 81 are adjust able. Spaeed slitting blades 85 are adjustably mounted on the upper shaft 81 and similarblades 86 are secured upon the lower shaft 82. These blades slit the tube above and below in the usual manner, as indicated in Fig. 7 of the drawings. The tube former 67 is provided with the usual slots, as at 88, to permit the operation of these blades as the tube advances. A lip cutter 90 is mounted upon the shaft 82 substantially midway between. the blades 86, and this cutter is provided with a substantially U-shaped blade 91 having a serrated cutting edge 92. The blade 91 is adjustably mounted upon a sleere 93 free upon the shaft 82. A stop 9-1 on this sleeve is adapted to be yieldingly held against the fixed pin 95 by the spring 96 so that the blade 91 is normally held in its forward position (Fig. 6). The pin 95 is mounted upon a collar 97 fixed upon the shaf-t 82. The shafts 81 and 82 are preferably gea'red to rotateithe blades 85, 86 and 91 at a higher speed than the tube is advanced along the former, so that the blade 91 would have a tendency to tear the paper if it were rigidly Vmounted upon the shaft 82. The blade is therefore permitted to yield sufliciently by the spring 96 so that it maintains the speed of the tube during the period of engagement therewith. As soon as the blade 91 has performed the cutting of the lip in the underface of 'the tube and become disengaged therefrom, it is immediately advanced to its forward position by the spring 96, the stop 911 coming in contact with the pin 95. The slits provided by the blades 85 and 86 are illustrated in Figs. ,41 to 43 of the drawings as at 100. The cut produced by the blade 91 is illustrated in Fig. 41, as at 101. V

The draw rolls.

After the tube has been slitted and the lip cut in the manner described, it is withdrawn from the former 67 by eri-operating draw rolls and 111 mounted on parallel' shafts 112 and'113 respectively. These shafts are geared together and driven from the 4main shaft'80. The shaft 112 is mounted in oppositely disposed eecentric ,bearings 114 (Fig. 9) carried. by adjnstable blocks-115. The positions of the blocks 115 in the side frames 116 are regulated by adjusting. screws 117 Which press against the upper faces 'of these bloclts. Corresponding springs 118 'yieldingly press .the bloeks against the ends of the adjusting screws. In order to permit a slight yielding movement of the upper roll 110 to compe'nsate for different thicknesses of paper, cushions of rubber or other suitable material, as at 119, are preferably interposed between the ends of the adjusting screws and their correspondingblocks'. Cupshaped sockets are provided for these cushions, as at 1.20. The adjusting screws-117 'are set to normally1 maintain the rolls in proper operative position. vIn order to facilitate the initial feeding of the tube belw tween these draw rolls, I have provided .an operating bar l121 which is connected at its ends to corresponding arms 122 on the eccentric bearings 114 so 'that a swinging of the bar about the axis of the shaft 112 causes the movement'of this shaft toward`or away from. the axis of the shaft 113 With a corresponding movement of the upper draw roll. Stop shoulders 123 are provided to li'mit the movement of these arms. 'The central portion .124 of the roll 110 is'preferably cut away so that no pressure is exerted upon the pasted strip at the center of ,the tube.- Similarly the outer portions 125 are cut away to prevent pressure 'upon the side tucks.

The plane of the axes of the shafts 112 and 113 isipreferably set at an angle to the plane of the tube as it is being drawn from the former. This is an advantageous feature as it causes the tube to contact with the periphery of the vupper roll for a considerable distance before the tube passes between the rolls and thus irons out the tube and prevents wrinkling of the same. It also rovides increased draft on the tube and eliminates the necessity for heavy pressure by the rolls which would otherwise A-,be required. This angular disposition' also tightens the paper about 'the former or mandrel and prevents spreading of the tube..'

The sever-ing flwchansm. v

the blade substantially directly into thenotch in the co-operating .female s'everi'ng;`

The blade is lmember on such' lower roll. then almost instantly withdrawn therefrom by a like movement.

The severing rolls 135 and 136 respectively arel mounted on corresponding `revoluble shafts 137.and 138 supported inthe s'de frames 116. The bearings 140 of the shaft 138are fixed in the present embodiment but' the bearings 141 of the shaft 137 are slidably mounted in` the side frames to permit this shaft to' be moved toward and from the shaft 138. The shaft 137 is normally forced away' from the shaft 138 by springs. 142 which act against the 'bearings 141. An oscillating cam shaft 143 is mounted in the side frames above the upper severing roll and carries a pair of cams 144. These cams co-,act with the corresponding bearings 141 to cause the shaft 137 to be moved toward the shaft 138 against the action of the springs 142 -for the purpose which will be presently described; i

is mounted on the lower end of the member 146 toco-act With the cam 149 to cause this member to be moved substantially longitudinally and to thus provide the oscillation of the shaft 143. The shaft 148 is geared to the shaft 138.

'The severing blade 151 is adjustably mounted on the roll 135 to completely detach the blanks successively from the tube. The roll 136 is provided with a female cutting member 152 having a slot 153 therein to re- ,ceive the blade 151. .This member 152 in the present embodiment consists of an elongated block secured in the periphery of the roll by means of screws 154.' This block is lcentrall notched, as at 154', to prevent the lip 10'1 eing severed from the blank by the loladei151.`

In each revolution ofthe severing rolls the blade 151 is brought into registration with the notch 153 in the block 152 and at this time the' nose 155 on the cam 149 comes into engagement with the roller 150 onthe member 146, lproducing a sudden `longitudinal movement of the member 146. This movement of the member 146 causes the shaft 143 to p'artially rotate and the shaft" 137 to beth'rustl toward the shaft 138 the cam- 144, projecting the blade 151 into the notch 153 and severing the blank. The cam 149 is 'preferably so shapedwthat the roller 150 willalmost instant-ly ride off the nose 155, permitting the member 146 to move upwardly and; the cams144'to resume their normal position. The roll 135 is moved away| from the roll 136 by the springs 142. Theformation of the cam V149 in, the present embodiment is such'that the severing 'rolls' are farthest apart at the time the blank enters,v gradually being moved nearer during the advance ofl the blank until the sudden Ithrust is -imparted to the upper roll to sever the blank. 1 Thisithrust movement of the blade is particularly advantageous as it` permits the notch 153 to be made very narrow and thus produces a better cut than is possible with the usual construction in which the notch is necessarily wide or flaring to permit entry and withdrawal of the blzlilde during the rotary movement of the ro s.

The transfer rolls.

n Upon leaving the severing rolls the blank is guided in its advance to the transfer rolls 161 and 162 by a substantially centrally located wire guide 160. These rolls 161 and 162 are disposed respectively above and below the blank, the lower roll 162 in the present embodiment being mouutcd in fixed bearings 16-1 in the f rame, whereas the boarings 165 of the roll 161 are adjustable for different thicknesscs of paper. The lower roll 162 is provided with a central peripheral groove 163 to admit the guide 160. This guide 160 prevcnts the bending down of the lip on the blank and thus facilitat-es the entrance and engagement of the lip gripper of the bottom forming mechanism. The transfer rolls are preferably so formed that no pressure is e.\:erted upon the edge or tucked portions of the blank or upon the central pasted strip.

The peripheral speed of the transferV rolls is preferably the same as that of the draft and severing rolls, but in view of the fact that a slight checking of the advance of the blank occurs at the instant of operation of the severing blade, it has been found advisable to permit a limited amount of slippage of the blank between the transfer rolls at this time. This is advantageous as it eliminates the tendency of the blank to buckle. The bearings 165 of the upper shaft 161 are preferably yieldingly supported on cushions 166 of rubber or other suitable material.

The tuch opening mechmrism.

Tuck opening mechanism is provided to enter and expand the side tucks so that the blank may be readily engaged by the grippers of the bottom forming mechanism when presented thereto. In the present embodiment this tuek opening mechanism comprises primarily a pair of oppositely disposed bladcs 170 which preferably extend longitudinally of the path of the blank from a point in front of the severing rolls substantially to the bottom forming mechanism. The wedge-shaped forward end 171 of each of these bladcs enters the correspending tuck as the blank 'emerges from' the draw rolls. These blades are normally stationary and are adjustably mounted at one end on a transverse rod 172 (Figs. 4 and 24) and at the opposite end on brackets 139 so that they may be moved in or out for different sizes of bags. In order to permit the scoring mechanism to operate substantially across the entire blank, each of these bladcs is preferably cut away at 173 (Fig. 17) and a reciprocating bridge 174: (Fig-s. 17-20) provided to Conduct the blank across the gap during the interval between the successive engagements of the scoring blades. This bridge is fixed 4on a rod 178 slidably mounted in bearings 179 on the blade 170. The bridge is moved to open the gap by means of a cam 175 which acts upon a cam roller 176 carried by an arm 177 on the rod 178. As soon as the roller 176 moves off the raised portion of the cain 175 the bridge 174 is moved to close the gap by a spring 180 connected to, one end of the rod 178. 'l`he bridge is advanced and enters the tuck as the forward end of the lblank passes betwcen the scoring rolls and it lies within the tuck just in front of the score line at the time of operation of the forward scoring. It then moves with the blank acrossV blade. the gap until it contacts with and forms a continuation of the blade beyond the gap. A slight flare, as at 181, is preferably given to the blade 170 just in front of the gap 17 3 to spread the tuck at this point and thus facilitate the entry of the bridge. A similar gap 182 is preferably provided in each of the blades 170 at the pointfiof operation of the sevcring rolls, but no bridge 1s necessary at this point. This bridge construction at the scoring position is a particularly advantageous feature.

The scoring mechanism.

The scoring mechanism shown principally in Figs. 21 to 24 inclusive comprises a pair of co-operating scoring rolls 190 to 191 operated by gearing from the main drive shaft. The upper roll 190 in the present embodiment is provided with two scoring bars or blocks 192 and 193 respectively provided with scoring bladcs 191 and 195. The rear scoring block 192 is made adjustable to permit the same block to be used for all sizes of bags. The block 193 is preferably stationarily mounted in the periphery of the roll. The block 192 is disposed within a longi- 'tudinal channel 196 in the roll and its ends to obtain the proper positioning of the blade,

194: and then tightening these screws. The lower scoring roll 191 is provided with 'notches to receive the bladcs on the upper roll. As the forward block 193 is not adjustable a single notch 201 is provided .to receive the blade in this block. A series of notches, as at 202, has been provided to receive the blade 194 in its different adjusted positions. The ,present embodiment shows

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