US636760A

US636760A - Paper-bag machine.

Info

Publication number: US636760A
Application number: US71991099A
Authority: US
Inventors: Edward E Claussen
Original assignee: Individual
Current assignee: Individual
Priority date: 1899-06-09
Filing date: 1899-06-09
Publication date: 1899-11-14
Anticipated expiration: 1916-11-14

Description

Patented Nov. l4, I899.

E.,E. CLAUSSEN.

PAPER BAG MACHINE.

(Application flladJuna 9, 1899.)

8 Sheets Sheet L (No Model.)

N ww

Irzven Zor 3 w w m m THE NORRIS 'rrrsns 00.. mom-mun, WASNINGYON. n. c.

No. 636,760. i Patented Nov. 14,1899;

1 E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Application filed Juno 9, 1899.) v (No'ModaL) 8 Sheets-Sheet 2.

Ever? ?0 r.

me warm: Psrzns c0 monxumo. WASHINGTON. D4 0.

No. 636,760. 7 Patented Nov. l4, I899.

E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Application filed June 9, 1899.) 4N0 Model.) '8 SheetsSheet 3,

1 i in asses.

y/mmaf Patented Nov. l4, I899.

E. E. CLAUSSEN. PAPER BAG MACHINE.

(Application filed June 9, 1899.)

(No Model.)

8 Sheets-Sheet 4.

lllll I ium wbii'zzesses. 56

THE NORRIS PETERS cot. l-nomu'ruc. wnsuwcrou, n. c.

Patented Nov. I4, I899.

E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Application filed June 9, 1899.)

8 Sheets-Sheet 5 -(.No Model.)

1728871707 mfi Y\/zilz asses Zeww THE cams PETERS c0, wuotaumq. WASNINGTON. u. c. 4

No. 636,760. Patented Nov. I4, I899. E. E. CLAUSSEN. PAPER BAG MACHINE.

(Application filed June 9, 1899.) (N M 8 Sheets-Sheet s,

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THE nomus PETERS co. more-urns WASNKNOTON n. c

Patented Nov. 14, I899.

E. E. CLAUSSEN.

PAPER BAG MACHINE.

(Appliation filed Juno 9, 1899.)

(No Model.)

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YUZ i IZ esses 72 ward-orm: nonafs Pzrens 00.. wcmruruou wAsnmsrou. n. q

Patented Nov. I4, I899.

E. E. cLAussEN; PAPER BAG momma.

(Application flied June 9, 1899.)

8 Sheets-Sheet a,

6N0 Model.)

mi Zncsses: %Q 6 UNITED STATES PATENT FFICE.

PAPER-BAG MACHINE.

'sPEcIFIcATIoN formingpart of Letters Patent No. 636,760, dated November 14, 1899.

Application filed June 9,1899. Serial No. 719,910. (No model.)

To all whom it may concern:

Be it known that I, EDWARD E. CLAUSSEN, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Paper-Bag Machines, of which the following is a full, clear, and exact specification.

This invention relates to improved means for converting tu cked-paper tubes into squarebottomed paper bags. The tubes which are to be folded into bags may be made and fed into the machine in any of several ways now well known in making paper bags, and the mechanisms which form the subject of this invention may be employed in connection with various types of paper-bag machines, and the same are equally applicable to and adapted as a converter for bags made in accordance with Letters Patent granted to L. O. Crowell February 20, 1872, No. 123,811, and known in commerce as the square bag, to convert the same into the square-bottomed bag.

One object of myinvention is to provide a simple, rapid, and reliable machine to complete by a single operation the bottom of the bag.

Another object of my invention is to provide suitable means for drawing the tube into the machine at a uniform speed, and, when the same has been fed forward the proper amount, to provide mechanism for retarding the leading end thereof, and thereby produce a slack between the drawing-rolls and the gripping-rolls, whereby a better severing of the bag-blank from the tube is accomplished, and simultaneously the retardation of the bag-bottom end of the blank allows more time for the bottom-forming mechanisms to perform the folding operation on the bag-bottom, whereby a greater speed in the manufacture of paper bags is attained- Still another object of my invention is to provide a bottom-folding mechanism consisting of a folding-plate and a presser-plate, the same being arranged crosswise of the machine and one above the other, so that as the blank emerges from the gripping-rolls it passes be tween the same for the formation of the bagbottom. Thus the folding plate and the presser-plate are superimposed one above the other, with the tube between them, while the axes of their bearings are at right angles to the tube. These two axes are substantially coincident with each other and are located substantially at that position where the characteristic primary transverse fold is to be made in the bag-blank. The bearing of the folding-plate is arranged in the right-hand side of the machine, whereas the bearings for the presser-plate are arranged on the lefthand side, and these plates are each provided with suitable bevel-edged grippers, which are adapted to hold the plies of the tube of the blank against the inner sides of these plates, and the beveled inner ends of these grippers serve as formers for defining the characteristic right-angled triangular folds which are to be formed in the bellows-sided blank. Mechanisms are also provided for operating the beveledged grippers and the forming-plates and their respective bevel-edged clips in proper time with each other, controlled by suitable cams to cooperate with the other mechanisms of the machine, as will be more fully described hereinafter.

In the preferred embodiment of this invention, herein shown and described, the paperbag machine comprises in part a suitable bed or framework, drawing-roll mechanisms for drawing the tucked-paper tube into the machine at a uniform speed, a revolving striker rotating across the path of the tube, verticaily reciprocating gripping rolls revolving at a retarded and an accelerated speed, bottom-forming mechanisms embodying the folding-plate, and the presser-plate provided with means for effectively holding the lower ply of the tube to the upper side of the folding-plate, and also with nipper mechanism for holding the upper ply of the paper tube to the lower surface of the presser-plate, an oscillating tucker-blade cooperating with the folding-plate and the presser-plate, a liftingplate mounted on the presser plate, and means for delivering the completed bag, all substantially as hereinafter described, and more particularly set forth in the claims.

In the drawings accompanying and forming a part of this specification, Figure l represents the plan of the machine. Fig. 2 represents a side elevation of what is shown in Fig. 1, showing the paper-roll from which the paper is taken, converting the same into the tube, and drawing the same into the machine to have the bottom completed thereon. Fig. 3 is a'plan view, drawn in an enlarged scale, showing the tube in that position in which the striker is about to sever the bag-blank from the tube and the bottom-folding mechanism to operate thereon to effect the folding of the bag-bottom. Fig. 4 is a side view of what is shown in Fig. 3, representing the geueral construction and arrangement of the gearing which drives and operates the various mechanisms. Fig. 5 is a side elevation of what is shown in Fig. 3, taken on the broken line 5 5 of that figure and in the direction of the arrows. Fig. 6 is a cross-sectional end view taken on the line 6 6 of Fig. 4 and in the direction of the arrows. Fig. 7 is a sectional end view taken on the zigzag line 7 7 of Fig. 4, lookingfrom the rear to the front end of the machine. Figs. 8, 9, and 10 are respectively fractional plan, front, and side views showing the peculiar arrangement of the folding-plate and its bevel-edged side clips carried thereby. Figs. 11, 12, and 13 are respectively fractional plan, front, and side views of the presser-plate mechanism and its cooperating bevel-edged side nippers. Figs. 14, 15, 16, and 17 show various successive positions of the bag-blank during the formation of the folding of the bag-bottom, and the mechanisms whereby the unfolding ofthe blank and the subsequent refolding into the square-bottomed bag is accomplished.

The letters and numerals herein used indicate, respectively, the same parts in the different figures of the drawings.

The arrows indicate, without further description, the direction of movement of parts.

In the accompanying drawings the position of the various instrumentalities is shown to best advantage, irrespective of the relative position these parts may have to their respective cam-grooves, and the same is true of all parts hereinafter mentioned, it being considered sufficient for the purpose of this description to assume that the cams are properly out to effect the various operations required at the proper time and to the necessary extent.

For more clearness the gears 32, 33, 64, and are broken away; but they are to be understood as having teeth out around their full circumferences.

A description will first be given of the general construction and arrangement of each section and of each motion of the machine and afterward their combined mode of operation will be described.

The base 20, adapted to receive the various brackets and the framework of the machine, is also adapted to properly support the paperroll 21, from which the paper is drawn, passed overthe roll (1, around the former, and converted into the tube 22, as clearly shown in Figs. 1 and 2.

Power is communicated to the machine by the pulley 23 in the direction of the arrow 24, which is fastened on shaft 25 on the outside of the frame 27, and that shaft is journaled in the

frames

27 and 28 and carries on the outside of the frame 28 the hand-wheel 26, and from this shaft the various gears communicate motion to the different parts of the machine. The shaft 25 has rigidly affixed thereto the gear 29, meshing into the gear 30, which is loosely mounted upon the shaft 31 and engages the gear 32. The gear 32 is rigidly connected with the gear 33, loosely journaled on the stud 33 and meshing into the gear 34, and that gear engages the gear 35. The gear29 also meshes into the gear 36, which engages the gear 37 ,which again meshes into the gear 38. The gear 30 meshes also into the gear 39, which engages the gear 39, which again meshes into the gear 40, and whereby a complete train of gearing is established, all of which is driven at a uniform circumferential speed. The gears 34 and 35 are respectively mounted on the

shafts

41 and 42, journaled in the

frames

27 and 28, and these shafts carry, respectively, the drawing-rolls 43 and 44,havin g theircentral portion grooved, so as to permit the float 45, terminating in the serrated edge 46, to pass between them and whereby the paper tube is drawn into the machine at a uniform rate of speed. Above the float and mounted crosswise of the tube is the serrated lip-knife 47, securely held on lugs projecting from the

frames

27 and 28, against which the tube is forced when separating the blank therefrom, as will now be described. Securely fastened on the shaft 31 and adjacent to the frame 27 is the spiral gear 48, meshing into a corresponding spiral gear 49, which is securely fastened on the striker-shaft 50, journaled lengthwise of the machine in

bearings

51 and 52, projecting from the inner side of the frame 27. Rigidly affixed to the striker-shaft 50 is the strikerarm 53, whereby the tube is severed as the arm is rotated across the path of the tube against the serrated float 45 and lip-knife 47.

As a convenient means forimpartinga variable circumferential speed to the grippingrolls 61 and 66 and also an oscillatory motion up and down I have devised the mechanism which will now be described and best shown in Figs. 4 and 6. The gear 30 is loosely journaled on the shaft 31 and is provided with a hub 54, from which the arm 55 extends, which supports and pivotally carries the sector 56, meshing into the pinion 57, cut into the shaft 31. The laterally-projecting arm of the sector 56 is provided with a projection 58, which engages the groove 59 of the stationary cam 60, rigidly held on the inner side of the frame 28. As the gear 30 is caused to be revolved at a uniform speed the arm 55 revolves therewith, carrying along the sector 56 and giving a variable speed to the shaft 31. Securely held upon the shaft 31 is the lower gripping-roll 61, provided on each side thereof with the

circular flanges

62 and 63, the object of which will be described later. Adjacent to the flange 62 is the gear 64, meshing into the gear 65, held securely fastened to the upper gripping-roll 66 and whereby the variable speed imparted to the shaft 31 and roll 61 is communicated to the roll 66. On each {side of the roll 66 are mounted the cam-

plates

67 and 68, adapted to engage and cooperate with the

circular flanges

62 and 63 of the lower gripping-roll 61. The upper gripping-roll 66 is rigidly mounted on the shaft 69, journaled in the

boxes

70 and 71, which are adapted to slide vertically in their

respective frames

27 and 28.

Springs

72 and 73 tend to press theroll 66 into operative engagement with the roll 61 during a partial rotation thereof, the same being timed and regulated by the shape of the cam-

plates

67 and 68, engaging the

circular flanges

62 and 63.

The gear 30 meshes into the gear 39, which engages the gear 39, which again engages the gear 40 and whereby a uniform rotary motion is transferred to the pasting mechanism, which will now be described.

The

gears

39 and 40 are respectively mounted on shafts 75 and 76, which are placed one behind the other crosswise of the machine and journaled in the

frames

27 and 28. The shaft 75 rigidlysupports the paster 77, which receives its paste from the paster-roll 78, which revolves in the paste-box 79, rigidly supported on the rod 80, which is also mounted crosswise of the machine and is supported in the

frames

27 and 28.

The mechanisms which convert the bottomforming end of the tube into the square-bottomed paper bag will now be described.

Mounted crosswise of the machine and j ournaled in the

frames

27 and 28, below the shaft 25, is the tucker-blade shaft 81, which has securely fastened thereto, projecting upward on each side of the lower gripping-roll 61, the

arms

82 and 83, which support on their upper surface the tucker-blade 84, which is placed immediately above the paper tube emerging from the gripper-

rolls

61 and 66. On the outside of the frame 27 the shaft 81 has securely fastened thereto the cam-arm 85, provided with the projection 86, engaging a groove in the cam 87 and whereby the tucker-blade 84 is oscillated from the position shown in Figs. 5 and 14 through the stages of forming the bottom, as shown in Figs. 15, 16, and 17. The bottom-folding mechanism also consists of the folding-plate 88, which is securely fastened on the head 89, forming a part of the shaft 90, which has its bearing in the projecting lug 91, extending inwardly from the frame 28. On the outside of the frame 28 the shaft 90 has rigidly secured thereto the sector-pinion 92, engaging the segment 93, which is loosely supported on the shaft 94, extending crosswise of the machine and j ournaled in the

frames

27 and 28. The downward-projecting arm of the segment 93 is provided with the projection 96, engaging a groove in the cam 97, and whereby the folding-plate 88 is adapted for an oscillatory motion through the arc of a circle of about one hundred and eighty degrees, as clearly shown in Figs. 14 to 17. The folding-plate 88 is provided on each side with downwardly-projecting arms 100, which are adapted to receive the bevel-edged side clips and their operating mechanisms. The construction and operation of the side clips being substantially the same on each side of the folding-plate, I have designated these parts with the same numerals, which are as follows:

The side clips 101 are pivoted to the arms by the pivots 102 and carry on their outer ends the arms 103, engaging spirally cut grooves in the cams 1041, supported and rigidly held on the shaft 105, which is also journaled in the arms 100. The spirallycut grooves in the cams are cut, respectively, right and left handed, so that when the shaft 105 is turned in one direction they will simultaneously close both side clips and will open them when the shaft is caused to be turned in the opposite direction. The location of these side clips is substantially such that the line passing through the intersecting points of the bevel-edged side clips and the edges of the tube forms eventually the edge of the completed bag-bottom. On the righthand side of and adjacent to the spirally-cut cam 104 is the pinion 106, which is engaged by the sector 107, loosely journaled on the shaft 90. On the hub of the sector 107 is arranged the pinion 108, which is engaged by the sector 109, which is loosely pivoted for oscillation on the shaft 94, and has a downwardly-projecting arm 110, provided with the projection 111 engaging in the cam 112. By the means just described the side clips 101 are caused to be oscillated inwardly toward each other at predetermined times to grip the paper tube and hold it on the upper side of the folding-plate and are also effectively carried outward to release the blank when the bag is completed. The folding-plate 88 is also provided on each side of the tube with two upwardly-projecting studs 113, the purpose of which I will describe more fully later on.

Mounted above the folding-plate 88 and superimposed above the tube is the presserplate 116, which is fastened to a head 117, forming a part of the shaft 118, which is mounted for vibratory motion in the inwardlyprojecting bearing 119 of the frame 27, and that shaft is provided on its outer end with a sector-pinion 120, meshing into the sector 121, which is loosely mounted on the shaft 9 1 and has integral therewith a downwardlyprojecting arm 122, provided with a projection 123, engaging the groove on the inner side of the cam 87, and whereby the presserplate 116 is adapted to receive an oscillatory motion, for the purpose described hereinafter. The location of the center lines of the

shafts

90 and 118 of the folding-plate 88 and the presser-plate 116, respectively, is substantially such that they coincide with one another and also correspond with the folding edge 140 of the lifting-plate 140.

The presser-plate 116 is provided with gripping mechanisms, which are substantially alike on each side thereof, and for the sake of convenience I have given those parts the same characters. On the upper surface of the presser-plate 116 and projecting upward are the arms 124, which carry pivotally-mounted side nippers 125, pivoted on shafts 126, which receive 011 their outer ends the cam-arms 127, engaging spirally-cut grooves of the cams 128, securely fastened on the shaft 129. The spirally-cut grooves in the cams 128 are respectively right and left hand, so that when they are turned in one or the other direction the side nippers are simultaneously opened or closed. The location of the side nippers is such that the line passing through the intersecting points of the bevel-edged side nippers and the edges of the paper tube forms eventually the rear edge of the completed bag. 0n the outer left-hand end of the shaft 129 is fastened the pinion 130, as clearly shown in Figs. 7, 11, 12, and 13, and that pinion meshes into the sector 131, which is pivoted on the shaft 118, and has cut on its hub the pinion 132, which engages the sector 133, loosely journaled on the shaft 94, integral with and carrying the downward-projecting arm 134, provided with the projection 135, engaging a groove 136 of the cam 137. By the means just described the side nippers 125 are adapted to swing inwardly against the under side of the presser-plate 116 at proper times and to the required extent. In the arms 124 of the presser-plate 116 is journaled the lift ing-plate 140, provided with the folding edge 140 on the shaft 141, which is held springpressed downward in its normal position by the spring 142, coiled around the shaft 141, and when the presser-plate and the foldingplate are in the position as shown in Figs. 1 and 14 the stud 113 on the plate 88 presses the lifting-plate out of its normal position to permit the advancing end of the blank to pass between them, and as soon as those plates begin to separate, as shown in Fig. 15, the spring 142 presses the lifting-plate down, so that the folding edge 140 engages the folding-plate, as shown in that figure. As stated above, the folding edge 140 coincides with the centers of the two oppositely-disposed

shafts

90 and 118, that form the centers of oscillation of the folding-plate 88 and the presser-plate 116, and it is furthermore observed that the distance from the edge 140 to the intersection of the bevel-edged side clips and bevel-edged side nippers with the edges of the paper tube is equal to the depth of the tucks of the bag-blank.

The

gears

37 and 38 are securely fastened on the shafts 143 and 144, mounted crosswise to the machine and journaled in the

frames

27 and 28, and carry the delivery-rolls 145 and 146, and as the bag is completed the tucker-blade 84 delivers the completed bag' from the bottom-forming mechanism into the bite of the delivery-rolls.

An important feature of this invention is the arrangement and construction of and the manner in which the folding and the presser plates are mounted. The centers coinciding and also being in alinement with the folding edge 140 will always bring the secondary trans verse folding-line in the bag which is defined by the edge 140 in the exact position. This is very desirable, inasmuch as those folds, if made on a line not coincident with the axis of oscillation of their folding devices, are liable to be more or less distorted and irregular.

I have preferably arranged the grip ping-roll 66 with the projection 66 running crosswise to the roll, upon which the paster 77 deposits the paste and from which it is transferred to the bag-blank. The cross-groove 61, cut in the lower gripping-roll 61, serves as a clearance to prevent paste being deposited upon the roll should the machine fail to present a bag-blank, which occurs every time a new roll of paper is threaded into the machine.

The operation of the machine is as follows: The paper roll 21 having been properly placed in its journals and having supplied the two paste-boxes with paste, the paper is guided backward and upward around the roll a and properly threaded around the former I 22, which forms the tube in the well-known manner. The bellows-sided tube, which surrounds the former and float, is drawn from the former, which terminates in the serrated float 46, as shown in Fig. 1, by means of the drawing-rolls 43 and 44 passing beneath the serrated lip-knife 47. The drawing-rolls are so geared in relation to the revolution of the striker as to feed through a suitable length of tubing for each revolution, and the grippingrolls are caused to be pressed against one another by means of the

springs

72 and 73 and by virtue of the

circular flanges

62 and 63 and the cam-

plates

67 and 68, and at this instant the retarding motion of the gripper-rolls takes place by means of the cam-groove 59 of the cam 60, thereby forming a slack in the tube to facilitate the cutting off of the blank, as clearly shown in Fig. 5. Immediately after the blank is severed from the tube an accelerated motion is imparted to the grippingrolls, thereby compensating for the previous retardation of those rolls. As the bottomforming end of the tube passes between the gripping rolls the same are separated by means of their cam-

plates

67 and 68, and paste is applied from the paste-box 79 and its roll 78 to the paster 77, then upon the projection 66, and from there upon the bag-blank, forming a transverse paste-line. As the bottomforming end of the bag-blank emerges from the gripping-rolls the same passes between the presser-plate and the folding-plate, the lifting-plate being held out of its normal position by engaging the upward-projecting studs 113 of the folding-plate 88. When the blank arrives at the position as shown in Fig. 14, the bevel-edged side clips 101 and the bevel-edged side nippers 125 close into the tucks of the tube and hold the lower plies to the folding-plate 88 and the presser-plate 116. At this instant the retardation of the grippingrolls takes place, whereby time is allowed for the accurate and close gripping of the tube, and an increased speed of the machine is attained. Meanwhile the folding-plate 88 and the presser-plate 116 are caused to be oscillated, and simultaneously the tucker-blade 84 proceeds in the direction of the folding-plates, and the bag is gradually transformed, as shown in the position of Fig. 15, until it reaches the position of Fig. 16, at which point the presser-plate has its movement reversed to its starting position, whereas the foldingplate 88 continues on with its motion until it reaches the position of Fig. 17. The side clips and side nippers are then withdrawn, leaving the folded bag resting on the tuckerblade 84, which delivers it into the bite of the delivery-rolls 14:5 and M6.

Having thus fullydescribed my invention, I claim- 1. The combination of a pair of drawingrolls to draw a paper tube at a uniform speed, a pair of gripping-rolls, the cam 60, the shaft 31, and intermediate mechanism whereby the circumferential speed of the gripping-rolls is adapted to be retarded to form a slack in that tube, and also adapted to be accelerated to compensate for the slack formed in the tube caused by the retardation of the same, and the striker to sever the tube, substantially as described.

2. The combination of a pair of drawingrolls to draw a paper tube at a uniform speed, a pair of gripping-rolls, the cam 60, the shaft 31, and intermediate mechanism whereby the circumferential speed of the gripping-rolls is adapted to be retarded to form a slack in that tube and also adapted to be accelerated to compensate for the slack formed in the tube caused by the retardation of the same, the float 45 surrounded by the tube and the lipknife 47 mounted above the tube, and the striker to sever the tube, substantially as described.

3. The combination of a pair of drawingrolls adapted to draw the paper tube into the machine at a uniform speed, a pair of gripping-rolls mounted in substantial parallelism with the drawing-rolls, means for moving the gripping-rolls away from and toward each other to alternately grip and release the bagblank, and means for varying the circumferential speed of the gripping-rolls during the time the bag-blank is held in the bite of those rolls, substantially as described.

4:. The combination of a pair of drawingrolls adapted to draw the paper tube into the machine at a uniform speed, a pair of gripping-rolls, cam-plates mounted on the shafts of the gripping-rolls and whereby the gripping-rolls are moved away from and toward each other, devices substantially as described for decreasing and increasing the circumferential speed of the gripping-rolls to form a slack in the tube, and devices to grip the bottom-forming end during the time the retardation of the tube takes place, substantially as described.

5. In a paper-bag machine, the combination of a pair of gripping-rolls, devices for retarding the circumferential speed of those gripping-rolls and thereby retarding the forward movement of the paper blank, and bottomfolding mechanisms to grip and complete the bellows-folded square-bottom bag by a single operation during the retardation of the bagblank, substantially as described.

6. The combination of the folding-plate, means for vibrating the same about one hundred and eighty degrees, side clips adapted to close upon the upper surface of the foldingplate, the presser-plate, means for vibrating the presser-plate, side nippers adapted to be closed upon the lower surface of the presserplate,the lifting-plate mounted on the presserplate and provided with the folding edge, and the tucker-blade, all combined and operating substantially as set forth.

7. The combination of a folding plate, means for vibratin g the same, side clips adapted to close upon the upper surface of the foldin g-plate, the presser-plate, means for vibrating the presser-plate, side clips adapted to close upon the lower surface of the presserplate, the folding-plate and the presser-plate mounted so that the center of vibration of the folding-plate and the center of vibration of the presser-plate coincide with one another, side nippers adapted to close upon the lower surface of the presser-plate, the lifting-plate mounted on the presser-plate, and the tuckerplate, all combined and operating substantially as described.

8. The combination of a folding plate, means for vibrating the same, side clips adapted to close upon the upper surface of the folding-plate, the presser-plate, means for vibrating the presser-plate, side nippers adapted to close upon the lower surface of the presserplate,the lifting-plate mounted on the presserplate and provided with a folding edge, the folding-plate, the presser-plate and the lifting-plate mounted substantially so that the centers of vibration of the folding-plate and the presser-plate coincide with one another and also coincide with the folding edge of the lifting-plate, and the tucker-plate, all combined and operating substantially as set forth.

9. In apaper-bag machine, the combination of afolding-plate journaled on one side of the paper blank, means for vibrating the foldingplate, side clips adapted to close upon the upper surface of the folding-plate, the presserplate mounted on the other side of the paper blank, means for vibrating the presser-plate, the folding-plate and presser-plate mounted in substantially such a position that the centers of vibration coincide with one another,

side nippers adapted to close upon the lower surface of the presser-plate, the lifting-plate mounted on the presser-plate and provided with the folding edge, which is coincident with the line passing through thereenters of vibration of the folding-plate and the presserplate, and the tucker-plate, substantially as described.

10. In a machine of the class specified, the combination of the folding-plate supported on one side of the blank, means for vibrating the folding-plate, side clips supported on either side of the blank and adapted to close upon the upper surface of the folding-plate; the presser-plate supported on the otherside of the blank and adapted to oscillate upon an axis located substantially coincident with the center of vibration of the folding-plate, side nippers supported on either side of the presserplate and adapted to close upon the lower surface of the presser-plate, the lifting-plate mounted on the presser-plate, provided with the folding edge which is substantially in line with the center of vibration of the presserplate and the folding-plate, and the tuckerblade, all combined and operating substantially as set forth.

11. Inapaper-bagmachine,incombination, the folding mechanism, consisting of the folding-plate and the presser-plate disposed on the opposite flat sides of the blank and supported in stationary frames at each edge thereof, the folding-plate and the presser-plate adapted to be vibrated, the centers of vibration being substantially coincident with each other, side clips mounted on the folding-plate, side nippers mounted on the presser-plate, the lifting-plate mounted on the presser-plate and having a folding edge coincident with the center of vibration of the folding and presser plate, the tucker-plate to form the transverse fold in the blank, all combined and operating as set forth.

12. In a paper-bag machine, the combination of the gripping-rolls, means for rotating the same with a retarded and an accelerated speed, folding mechanism consisting of the folding-plate, supported on one side of the blank, and also provided with means for vibrating the same upon an axis located substantially in line with the secondary transverse folding-line which is to be folded in the bag-blank, side clips adapted to close upon the upper surface of the folding-plate, the presser-plate supported on the other side of the blank and adapted to oscillate upon an axis located substantially coincident With the center of vibration of the folding-plate, side nippers adapted to close upon the lower surface of the presser-plate, the lifting-plate mounted on the presser-plate, provided with the folding edge, which is substantially in line with the center of vibration of the presserplate and the folding-plate, and the tuckerblade, all combined and operating during the time the retardation of those gripping-rolls takes place, substantially as set forth.

13. In a'paper-bag machine, the combination of the gripping-rolls, means for rotating the same with a retarded and an accelerated circumferential speed, a folding mechanism consisting of the folding-plate and the presserplate disposed on the opposite flat sides of the blank, and supported in stationary frames at each edge thereof, the folding-plate and the presser-plate adapted to be vibrated, the centers of vibration being substantially coincident with each other, side clips mounted on the folding-plate, side nippers mounted on the presser-plate, the lifting-plate mounted on the presser-plate and havingafolding edge coincident with the centers of vibration of the folding and presser plate, the tucker-plate to form the transverse fold in the blank, all combined and operating during the time the retardation of those gripping-rolls takes place, substantially as set forth.

14. The combination of the folding-plate,

means for vibrating the same about one hundred and eighty degrees, side clips adapted to close upon the top surface of the foldingplate, the presser-plate, means for vibrating the presser-plate, side nippers adapted to be closed upon the lower surface of the presserplate,the lifting-plate mounted on the presserplate and providedwith the folding edge, the tucker-blade, studs 113 secured on the folding-plate adapted to engage the lifting-plate to permit the end of the bag-blank to enter the folding mechanisms, substantially as described.

- 15. The combination of a folding-plate, means for vibrating the same,side clips adapted to close upon the upper surface of the folding-plate, the presser-plate, means for vibrating the presser-plate, the lifting-plate mounted on the presser-plate and provided with a folding edge, the folding-plate, the presserplate and the lifting-plate mounted substantially so that the centers of vibration of the folding-plate and the presser-plate coincide with one another, and also coincide with the folding edge of the lifting-plate, side nippers mounted on the presser-plate and adapted to close upon the lower surface of the presserplate, the tucker-plate, studs 113 secured on the folding-plate adapted to engage and raise the lifting-plate out of its normal position during the time the advancing end of the bagblank enters the folding mechanisms, substantially as described.

EDXVARD E. CLAUSSEN.

Witnesses:

H. D. MILDEBERGER, J. S. ELLSVVORTH.