US629472A

US629472A - Paper-bag machine.

Info

Publication number: US629472A
Application number: US71013599A
Authority: US
Inventors: Murray Schenck
Original assignee: Union Bag and Paper Corp
Current assignee: Union Bag and Paper Corp
Priority date: 1899-03-23
Filing date: 1899-03-23
Publication date: 1899-07-25
Anticipated expiration: 1916-07-25

Description

N0. 629,472. Patented July 25, I899.

' 1 M. SCHENGK.

PAPER BAG MACHINE.

(Application filed Mar. 23, 1899.)

(No Model.)

5 Sheets-Sheet l.

. 0 4 N, tnsses: U Inventor I. I

Ww$w Attorney No. 629,472. PatentedJuly 25, I899.

M. SCHENCK.

PAPER BAG MACHINE.

. (Application filed Mar. 23, 1899.) (No Model.) I 5 Sheets$heet 2.

. Attorney No. 629,472. Patented July 25, I899.

M SCHENCK PAPER BAG MACHINE.

A l c n max 23 1809) 5 Sheets$heet 3.

(No Model.)

Inventdr w S w Witnesses:

I A I" Attorney No. 629,472. Patented m 25, I899.

, n. SCHENCK.

PAPER BAG MACHINE.

(Application filed Mar. 23, 1899.)

(No Model.) 5 sheets-Sheet 4.

9 J3 E g 41. 31.30

immmm H; 10

e sssz Inventor I WALL/1M]. (n7 Attorney No. 629,472. Patented July 25, I899. M. SCHENCK.

PAPER BAG MACHINE.

(Application flied Mar. 23, 1899 (No Model.) 5 Sheets-Sh9et 5.

Witnesses: Mme/M Inventor Attorney NIT/ED. STATES PATENT Enron.

MURRAY SOHE NCK, OF MlDDLETOlVN, OHIO, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE UNION BAG AND PAPER COMPANY, OF NEW JERSEY.

PAPER-BAG MACHINE.

SPECIFICATION forming part of Letters Patent No. 629,472, dated duly 25, 1899.

Application filed March 23, 1899. Serial No. 710,136. (No model.)

To all whom it may cancer/t:

Be it known that I, MURRAY SQHENCK, of Middletown, Butler county, Ohio, have invented certain new and useful Improvements in Paper-Bag Machines, (Case 11,) of which the following is a specification.

This-invention pertains toimprovements in paper-bag'machines of that class which deal with sections of abellows-folded tube and produce a square-bottom bag; and it relates to mechanism for opening the end of the tube and producing the diamond fold ready for the paste and subsequent folding of the flaps to complete the bottom. The bag-sections are brought within the range of operation of my improved device by means of a traveling carrier, preferably in the form of the usual rotating cylinder, to which the bag-section is prop- I erlygripped, the diamond fold beingproduced by the operation of a fly-plate slidingin a tumbler mounted eccentrically in a rotary driver, the fiy-plate being given part of its motion by driving-pins on the carrier and the remainder of its motion by additional gearing with very quick action.

My improvements will be readily understood from the following'description, taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of so much of an ordinary paper-bag machine as is concerned with my improvement, a portion of the frame and a press-roller being omitted in order to expose certain cams; Fig. 2, a plan of the same, the dance-rolls being omitted and one of the cams and the rotary driver appearing partly in horizontal section; Fig. 3, a perspective view of elemental character, illustrating a bag-section clamped to the carrier 40 partly opened by the action of the fly-plate;

Fig. 4, a perspective view of one of the grippers of the carrier-cylinder; Fig. 5, a perspective view of the fiy-plate; Fig. 6, a perspective view of one of the fixed cams; Fig. 7, a perspective view of the rotary driver of the fly-plate; Fig. 8, a perspective View of, the I tumbler which carries the fly-plate; Fig. 9, a perspective view of the first dance-roll; Fig.

10,51 perspective view of the second dance,

roll; Fig. 11, a vertical section of the flyplate and its immediate accessories; Fig. 12,

a side elevation of the so-called finger-gear ing by means of which the fiy-plate is given its rapid motion of rotation to its starting po-' sition after its completion of its work upon the bag-section; Fig. 13, a planv of a portion of the fly-plate, tumbler, rotary driver, and finger-gearing, parts appearing in horizontal section; Fig. 14, a diagram showing the fly plate, the dance-rolls, and aportion of the carrier-cylinder, the fly-plate being in what may be called its initial position, being ready to attack the bag-section; Fig. 15, a similar diagram showing the fly-plate at the instant of its compressive engagement with the bag-section; Fig. 16, a similar diagram showing the fly-plate at the completion of its folding work upon the bag-section, the first dance-roll haviu descended and engaged the bag-section; Fig. 17, a similar diagram showing the fly-plate in engaged position, but with the carrier advanced relative thereto, so as to partially withdraw the bag-section from the toe of the fly-plate, the first dance-roll moving forward with the carrier and the second dance-roll descending toward the carrier Fig. 18, a similar diagram showing the flyplate as having been relieved from the bagsection and having begun its overturning motion toward initial position, both dance-rolls being in working position against the bagsection; and Fig. 19, a similar diagram showing the fly-plate as having continued its returning motion toward initial position, the first dan ce-roll having completed its work and risen out of action, the second dance-roll having moved forward with the carrier and completed its work ready for rising to inactive initial position.

In describing my invention I will first refer to the par-ts of the bag-section in order to secure definition for certain terms employed construction of devices will be described, followed by the description ofthe mode of operation.

In the drawings, referring for the present to Fig. 3, 1 indicates the carrier for supporting and advancing the bag-section and having, preferably, the form of a cylinder carrying the bag-sections upon its periphery; 2,

the bagsectionlying thereon; 3, the lower herein, after which the preferred forms of IOO flap of the bag-bottom, which will be termed the prow-tlap; 4, the usual gripper upon the carrier engaging the prow-flap and serving to hold it to the carrier in case the prowflap is severed from the mouth of the preceding bag-section while its bottom is being dealt with, it being understood that it is customary in paper-bag machines to either completely sever the tube into bag-sections or to only partly sever them, so as to leave the lower ply of the mouth of one bag-section connected by a tail with the prow-flap of the succeeding bag-section, my present invention being adapted for use with either system; 5, the upper flap of the bag-bottom, hereinafter termed the trailing flap, this being the flap which is to be lifted from the prow-flap and folded back flat upon the bag-body, thus opening the bag-bottom and forming the diamond fold; 6, the lower plies of the bellows fold just forward of the main central folding-line, these portions having a triangular form after the diamond fold has been formed, and being hereinafter termed the lower triangles, there being one at each side of the bag-section; 7, the carrier-grips engagingthe lower triangle 6 of the bag-section, and thereby holding these portions of the bag-section nicely to the surface of the carrier, the forward edges of these grips being at an angle to define the folding-lines for the lower triangles, these grips moving with the carrier and being of ordinaryconstruction and ll'lOll nting, their office being to hold the lower triangles to the carrier while the diamond fold is being formed and to define the forward lines of the lower triangles and to hold the bag-section to the carrier as long as needed; 8, the up per triangles of the bag-section or that portion of the upper plies of the bellows fold lying against the lower triangles before the opening is begun; 9, the fly-plate, with its edge resting across the bag-section at the central folding-line of the diamond fold, the tipping operations of this plate serving to define the central folding-line and to open the bag-section and form the diamond fold; 10, a grip: per carried by the face of the fly-plate and engaging the trailing flap and holding it to the surface of the liy-plate during the opening and folding operation, this gripper in my preferred construction having the form of a pair of small cylindrical studs covered with soft-rubber tubing; 11, the side grips carried by the fly-plate, beingin the form of delicate fingers adapted to swing into the bellows fold and clamp the upper triangles 8 to the flyplate, the working position of these side grips being such that their edges farthest from the edge of the fly-plate will define the angular folding-lines of the upper triangles, and 12 the central folding-line of the diamond fold.

The elements of the operation may be understood from Fig. 3. Assume the bag-section lying upon the carrier and clamped thereto and only opened to such extent as is due to the springing of the paper. The fly-plate is laid over the trailing flap and its edge brought accurately and firmly down at the central folding-line of the bag-section, after which grips 10 and 11 clamp the trailing flap and upper triangles to the lower face of the plate. Then while the carrier and bag-section and the active edge of the fly-plate advance the free edge of the fly-plateis retarded and elevated and finally depressed, the result being the raising and folding back of the trailing liap andthe formation of the diamond fold, atwhich time the grips of the fiy-plate may be released and the diamond fold become subjected to the action of pressing devices while the fly-plate completes it rotation ready to present its active edge to a succeeding bagsection.

Proceeding with the drawings and referring to Fig. 4, 13 indicates the body of one of the carrier-grips 7, of not unusual construction, the same being pivoted to the side of the carrier so as to swing the grip properly into the bellows fold of the bag-section, the grip being operated by the usual spring for closing it and cam for opening it; 14, the usual roller through which the operating-cam acts in opening the grip; 15, a bar sliding lengthwise inthe body of the grip; 16, a prong formed upon the outer end of bar 15 and forming, in effect, the rear portion of grip 7; 17, a springupon bar 15, urging prong 16 into the plane of grip 7; 18, a roll or stud on the inner end of bar 15 and adapted to be engaged by a suitable cam to be later described, and 10 a pin carried by the side of the carrier, preferably one at each side, the axis of this pin coinciding with the central foldingline of the diamond fold of the bag-section.

The grip 7 operates as usual in clamping the lower triangles of the bag-section to the carrier. YVhen the flyplate comes down upon the trailing flap preliminary to beginning its work thereupon, the side grips ll of the fly-plate must enter the bellows fold to engage the upper triangles, and it is highly desirable that at this time the bellows fold. shall be slightly opened. In Fig. 4 assume grip 7 to be firmly clamping the bag-section to the carrier. At proper time stud l8 rides over a cam, the result being that prong 16 is raised somewhat. At this time the fly-plate lies over the bag-section, with its edge engaging the central folding-line thereof. Consequently the upper plies of the bellows fold will be pressed up against the plate and the bellows opened, thus giving the side grips of the fly-plate an opportunity to freely enter and go into action, after which prong 16 descends and becomes again merely a part of grip 7.

Proceeding with the drawings, 20 indicates the general fixed frame of the machine; 21, Fig. 7, the rotary driver, consisting of a pair of disks in line with each other and having spindles journaled in the frame, the disks constituting, in elfect, the end sections of a mutilated roller disposed across the carrier 1;

22, eccentric-bearings in the disks of the. rotary driver; 23, a stretcher-bar connecting the two disks of the driver, so that the driver forms a rigid rotating structure; 24, the tumbler which carries the fly-plate, this'tumbler consisting of a plate disposed between the disks of the driver and having spindles journaled in the eccentric-bearings of the driver, the entire tumbler being best seen in Fig. 8; 25, the spindles of the tumbler, the same being journaled in the disks of the driver; 26,

guides near each side of the tumbler and engaging grooves in the edges of the fly-plate, so that the fiy-plate can slide in the tumbler, and thus have its active edge move toward and from the axis of the tumbler; 27, fixed facial cams secured to the frame of the machine, one around each of the disks of the rotary driver, the cams presenting their grooves inwardly, the cam being best illustrated in Fig. 6; 28, a cam-lug projecting from the inner face of each of the cams 27 in position to be engaged by studs 18, Fig. 4, of the grippers of the carrier; 29, a cam-lug projecting from the inner face of one of the cams 27 to serve in opening the grip 10 of the fiy-.plate at time of reception of the bag-section; 30, guide-grooves in the inner faces of cams 27 to support the sashes of the dance-rolls; 31, a cam-lug projecting from the inner face of one of cams 27 to act upon one of the dancerolls, as later explained; 32, the active edge of the fiy-plate, the same being sufficiently thin to be somewhat flexible, so that the flyplate may exert a firm pressure exactly upon the folding-line of the bag-section regardless of slight inaccuracies of the cams 27, which control the pressure of the fly-plate; 33, trunnions projecting sidewise from the non-active edge of the fly-plate, these trunnions engaging within cams 27, whereby the rotary driver carries the tumbler around in an orbit, the fiy-plate revolving with the tumbler and sliding across the driver under the influence of cams 27, acting upon trunnions 33, the flyplate being best shown in Fig. 5; 34, a rockshaft mounted on the face of the fiy-plate and carrying the trailing-flap gripper 10, hereto: fore referred to, the rocking of this shaft serving to move these grippers to and from the face of the fiy-plate; 35, a second rock-shaft mounted on the face of the fly-plate; 36, an arm linked to rock-shaft 34 and serving to transmit rocking motion from shaft 35 to shaft 34; 37, a spring on rock-shaft 35, tending to hold grippers 10 in position of closure against the face of the fly-plate; 38, an arm on one end of rock-shaft 35, adapted as the driver revolves the fiy-plate to engage cam-lug 29, Fig. 6, whereby gripper 10 is temporarily opened; 39, Fig. 8, an inclined cam formed on one of the spindles of the tumbler and adapted as the fiy-plate slides in the tumbler: to be engaged by arm 38, whereby gripper 10 is temporarily opened for the release of the ba -section; 40, arms formed at'th'e sides of the fly-plate and having at their extremities notches adapted to be engaged at proper time by the pins 19 of the carrier, the axes of these notches, or their common axis, rather, coinciding with the active edge 32 of the fly-plate; 41, arms pivoted on studs at the edges of the face of the flyplate, these arms bearing the side grippers 11, heretofore mentioned, whereby these grippers may swing in and out of active position, the hubs of these arms having each a cam-notch in its lower face; 42, cam proj ections on the fiy-plate engaging said notches in the under surface of arms 41, whereby when grippers 11 are swung outwardly they occupy a plane away from that of the face of the fiy-plate and when they swing inward to active position they tend tolie down against the face of the fly-plate; 43, springs on the studs of arms 41, pressing the arms and their.

grippers toward the fly-plate and yielding to permit the action of projections 42; 44, a second' pair of arms similarly mounted on studs on the fiy-plate, but farther from the active edge of the fly-plate; 45, links, one connecting each arm 41 with its fellow arm 44, so that the two arms of the pair oscillate in unison; 46, a finger projecting outwardly from each arm 44; 47, a second finger projecting outwardly from arm 44, this second finger being shorter than arm 46 and in a plane nearer the surface of the fly-plate; 48, Fig. 8, a'dog projecting up from each side of the tumbler in position to be engaged by finger 46 as the fiy-plate slides in the tumbler, whereby the opening motion is given to grippers 11, the

tumbler having one of these dogs at each side of the fly-plate, so as to actuate both of the side grippers of the fly-plate; 49, a second pair of dogs carried by the tumbler and adapted to be engaged by fingers 47 to give grippers 11 their closing motion, dogs 49 being lower than dogs 43 and nearer together, so

that long fingers 46 may clear them at their tops, fingers 47 being so short as to clear dogs 48 entirely; 50, Figs. 2, 12, and 13, a mutilated pinion fast on one end of the spindle of the tumbler outwardly beyond the cam 27 at that side of the machine; 51, a mutilated pinion loose on the spindle of the rotary driver and meshing with pinion 50; 52, a radially projecting finger fast with pinion 51; 53, a

stop-finger pivoted tosthe main frame and adapted to swing into position to be in the path of finger 52 as the latter revolves, the

parts

50, 51, 52, and 53, collectively, being herein termed the finger-gear; 54, a shaft mounted in the frame parallel with the rotary driver and turning in unison therewith; 55, a roller thereon and pressing against the carrier and serving as a press-roll acting upon the diamond fold; 56, Figs. 1 and 2, a cam fast on shaft 54; 57, a bar pivoted to stopfinger 53 and straddling shaft 54 and capable of endwise movement; 58, a roller on bar 57, engaging the periphery of cam 56, whereby as shaft 54 rotates stop-finger 53 will be moved into the path of finger 52, and 59 gears on shaft 54 and on the spindle of the' rotary driver to serve in giving rotation to the shaft and driver in unison, one turn for each bagsection to be dealt with, these gears being preferably actuated from the usual mastergear on the carrier.

As the driver rotates it carries the tumbler around in an orbit, the fly-plate going with the tumbler and having a sliding motion therein, the body of the fly-plate thus being carried closer to and farther from the carrier. \Vhen the active edge of the fiy-plate is presented rearwardly and depressed, then pins 19 of the carrier engage the notches of arms 40 of the fiy-plate, and consequently as the carrier advances and the driver turns the active edge of the fly-plate will travel along with the folding-line of the bag-section, the plate turning on this edge as an axis so long as the edge of the plate isin contact with the carrier. During this time trunnions 33, engaging the cams27, hold the edge of the flyplate snugly to the ba -section while the diamond fold is being formed. During this interval the finger-gear is without office, the pins of the carrier engaging the arms 40 at this time constituting, in effect, a one-toothed gear, by means of which the fly-plate is forced to take on a rotary motion, with the trunnions of the tumbler as an axis. When the edge of the fly-plate reaches the forward extremity of its motion, its folding working having been fully performed, then the pins of the carrier move on out of notches of arms 40, the carrier having no further effect upon the flyplate. At this instant cam 56 moves stopfinger 53 into active position against finger 52, the cam being so contoured and timed that the effect of the finger-gear will be for an instant merely to steady the fiy-plate, after which the finger-gear becomes quickly active and rotates the tumbler, so as to rapidly flop the fly-plate over to its starting-point ready to engage a new bag-section and have its arms 40 engaged by the pins of the cylinder, cam 56 withdrawing stop-finger 53 to idle position so soon as the fly-plate shall have again come under the domination of the carrier-pins. The fly-plate makes a complete revolution with reference to the axis of the rotary driver 21; but in the same length of time the rotary driver makes a revolution, so that the fly-plate never makes a complete revolution with reference to the rotarydriver. Thefinger-gearing serves in greatly quickening the turning of the fly plate in the driver during a port-ion of the rotation of both. It is this action of the finger-gearing which permits pinions 50 and 51 to be mutilated. When the fly-plate goes to initial position ready to attack the bag-section, its sliding motion through the tumbler causes arms4c7 to engage dogs 49, thus quickly swinging side grippers 11 to closed position. At the same time arm 38 is engaged by cam-lug 29, which opened grippers 10, these grippers promptly snapping shut at the properinstant. The form of camlug 29 is such that as the fly-plate approaches initial position the grippers 10 are wide open, the grippers promptly closing upon the trailing flap of the bag-section; but in practice there may be a little slackness in the trailing flap. I-Ience cam-lug 29 has a point acting the second time to open grippers 10 to a slight degree, thus permitting the slack of the flap to readjust itself in the grippers before final closure. When the fly-plate completes its folding motion its sliding motionin the tumbler causes fingers 4G to engage dogs 48, whereby said grippers ll swing to ina'ctive position. At the same time arm 38 rides upon cam 39, thus opening grippers 10, the result being that when the fly-plate reaches final folding position all of its grippers are released and the carrier is at liberty to move onward with the bag-section.

Referring further to the drawings, 60, Figs. 1, 2, 9, and 11, indicates a sash sliding in the rear grooves 30 of cam 27; (51, a pair of downwardly and rearwardly reaching arms pivoted to the lower portion of this sash; 62, a spring arrangedupon the pivot of these arms and tending to hold them yieldingly in their most elevated position; 63, a stop-pin connected with the arms and serving to limit the upward movement of the arms; 64, an arm fast with arms 61. and bearing a roller adapted to engage to the front or rear of cam-lug 31; 65, a roll journaled in the free extremities of arms (51, this roll forming the first dance-roll; 66, a rock-shaft mounted in the frame parallel with shaft 54:; 67, a cam fast on shaft 54; 68, a sleeve loose on rock-shaft 66; 69, an arm fast with sleeve 68 and having a roller bearing on the periphery of cam 67, which cam, however, is partly shrouded, so as to constitute a peripheral cam partially formed with a facial groove, as seen in Fig. 1; 70, an arm fast with sleeve 68 and linked to sash 60; 71, a spring acting on arm 69 and tending to hold its roller in contact with the periphery of cam 67 and tending to urge sash 60 and the dance-roll 65, carried by it, to its lowermost position, and 71 a finger connected with arm 61 and projecting downwardly, so as when the dance-roll is down upon the carrier to be engaged by the pin 19 of the carrier.

Referring to Fig. 11, dance-roll 65 is normally up'and out of action and held so by its cam 67, spring '71 seeking to draw it down. At the instant the fly-plate has turned with its edge in most forward position, having completed the opening of the bag-section, cam 67 permits dance-roll 65 to move downwardly to the carrier. In the descent of the dance-roll itstrikes the bag-section squarely central of the bulging sides formed by the opening operation, and in its continued descent it presses down the paper, thus flattening the central portion of the fold, and it finally bears directly at the central folding-line, pressing the paper to the toe of the fly-plate. WVhen dance- 1'01165 has taken this position, then finger 71 is in the path of pin 19 of the carrier, which pin is ready to advance outof engagement with the arm of the fiy-plate. The carrier-pin therefore presses dance-roll 65 forward, during which movement it passes forwardly under its center of suspension, the angular motion of its arms 61 causing the sash 60 to rise against the tension of spring 71, the dance-roll thus exerting a yielding pressure upon the diamond fold at the central foldingline. The carrier-pin causes the lower periphery of dance-roll 65 to move at the same speed as the bag-section; but as the center of the roll is higher than its periphery and is constantly swinging farther forward under its point of suspension it follows that the roll has a slight retrogressive motion on the paper, thus traveling backward a trifle upon the folds while still engaged by the toe of the fiyplate. When the carrier-pin leaves the flyplate, the bag-section advances off of the flyplate, the dance-roll continuing its forward motion, but not quite so fast as the bag-section, the central fold being thus nicely pressed by the dance-roll. Finally the carrier-pin leaves arm 71 and the bag-section continues on under the dance-roll, which completely presses a portion of the trailing flap of the diamond fold. Nhen the trailing flap shall have partly passed under the dance-roll, then the cam permits the roll to rise again to normal idle position. As dance-roll 65 descends roller 64 is in front of cam-lug 31; but when the dance-roll is being urged forward by the carrier-pin then roller 6% gets to the rear of cam-lug 31, so that as sash 60 rises the danceroll will not be capable of being snapped suddenly to normal position on its suspending pivots by spring 62, cam-lug 31 permitting spring 62 to act gradually during the ascent of the sash. The matter just described constitutes the first dance-roll system and has to do only with the trailing portion of the diamond fold.

' Referring further to the drawings, 72, Figs. 1, 2, 10, and 11,indicates the sash of the second dance-roll, sliding in the front grooves 30 of cams 27; 73, suspension-arms pivoted thereto; 74, a spring on the pivot of these arms tending to press the arms downward; 7 5, the second dance-roll mounted in the free extremities'of arms 73; 76, a cam fast on shaft 54; 77, an arm fast on shaft 66 and having a roller engaging the periphery of cam 76; 78, an arm fast on rock-shaft 66 and linked to sash 72, and 79 a spring connected with arm 77 and tending to urge sash 72 to its uppermost position.

Referring to Fig. 11, second dance-roll 75 is normally up and idle and held up yieldingly by spring 7 9. Cam 76 forces roll 7 5 downwardly to the carrier, so as to engage the bag-section at theinstant the central folding-line comes under the first dance-roll.

, The cam continues to force sash 72 downward, the result being that dance-roll 75 is forced forwardly at a higher rate of speed than the bag-section, the dance-roll thus rolling and pressing the prow portion of the diamond fold.

from what follows: In Fig. 14 the fiy-plate is in what may be called initial position being still under the domination of the fingergearing, which is rapidly moving the active edge of the plate toward the carrier. The side grippers of the plate are open. The carrier is advancing the bag-section, which is gripped to it. The two dance-rolls are up and idle. Fig. 15 illustrates the next position. The finger gearing has turned the plate so as to bring its active edge down clampwise upon the bag-section at the central folding-line. The plate-grips have all closed. The trailing-flap grip on the fly-plate has opened and closed and slightly opened and again closed, so as to take care of the slack in the trailing flap. The finger-gear has ceased its engagement, and the carrier-pins have engaged the notched'arms of the plate, Whereupon the plate comes under the domination of the carrier, the active edge of the plate accompanying the central folding-line of the bag section and the plate opening up the trailing flap. Fig. 16 illustrates the third position. The active edge of the plate has been carried forward with the central folding-line of the bag-section, and the trailing flap has been folded well back. The active edge of the flyplate hasbeen carried to its most advanced position and all of its grips are opening. The first dance roll has come down and depressed the sides of the fold and has taken a bearing on the bag-section over the toe of the plate, the plate now remaining stationary and the first dance-roll moving forward under the influence of the carrier-pin,but crawling somewhat backward upon the trailing fiap, thus taking domination 'of the central fold as the same gradually withdrawsfrom the toe of the plate. Fig 17 illustrates the next position. The first dance-roll has beencarried still farther for ward, but has worked somewhat backward relative to the folding-line. The carrierpins have left the notched arms of the flyplate, and the finger-gearing has taken domination of the fly-plate and is ready to quickly floplit over to initial position. The second dance-roll is descendingand is near the carrier. Fig. 18 illustrates the next position.

The finger-gearing has turned the fly-plate rapidly toward its initial position. Thesecond dan ce-roll has engaged the diamondfold and has begun its rapid forward travel over the prow-flap. Fig. 19 illustrates the next position. The finger-gearing has turned the fly-plate well toward initial position. The continued descent of the sash of the second dance-roll has forced that roll forward over the prow-flap. The first dance-roll has disengaged from the carrier-pin and the trailing flap has passed partially under it and been subjected to its pressing action, and the roll has again gone up toward idle position. Fig. 14, before referred to, illustrates the next or initial position, the edge of the fly-plate coming down upon the next bag-section. The second dance-roll having completed its forward trip moves back, still pressing on the diamond fold and finally rises again to normal idle position. After the diamond fold has been thus far completed the carrier takes it forward for the usual subsequent treatment.

I claim as my invention 1. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to advance a bag-section, a gripper mounted on the side thereof and adapted to engagea lower triangle of the bag-section and clamp the same to the carrier, a section of said gripper movably mounted with reference to the remainder of the gripper, a spring pressing said section into the plane of the main portion of the gripper, a projection connected with said section, and a cam adapted to be engaged by said projection to press said section out of the plane of the main portion of the gripper and away from the carrier.

2. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to receive and advance a bag-section, a gripper-body pivoted to the side thereof, a gripper-finger on said body adapted to engage over the face of the carrier, a rod sliding in said gripper-body, a finger on said rod and forming an independently-movable section of the gripper,a spring on said rod serving to press said finger into the plane of said gripper, a stud projecting from said rod, and a cam adapted to be engaged by said stud to move said finger out of the plane of said gripper and away from the surface of the carrier.

3. In a paper-bag machine, the combina tion, substantially as set forth, of a carrier adapted to hold and advance a ba -section, a rotary driver mounted across the carrier, a fly-plate mounted in the driver and capable of sliding motion with reference to the axis of the driver, projections sidewise from the fly-plate, and cams engaging said projections and controlling the sliding motion of the flyplate.

4- In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to hold and advance a bag-section, a rotary driver mounted across the carrier, a fiy-plate mounted in the driver and capable of sliding motion with reference -to the axis of the driver and having a thin flexible edge adapted to cooperate with the surface of the carrier, projections sidewise from the flyplate, and cams engaging said projections and controlling the sliding motion of the fly-plate.

5. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to hold and advance a bag-section, a rotary driver mounted across the carrier, a tumbler eccentrically mounted in said driver, a fly-plate mounted for sliding motion in said tumbler and having an edge adapted to cooperate with the surface of the carrier, and cams adapted to control the sliding motion of the fiy-plate in the tumbler.

6. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to hold and advance a bag-section,

a pin carried thereby,a rotarydriver mounted across the carrier, a fly-plate mounted in the driver and having an edge adapted to cooperate with the carrier, a notched arm mounted on the fly-plate and adapted to be engaged by said pin whereby said pin advances the active edge of the fly-plate, and gearing connected with the fly-plate to serve in rotating the same when said pin is disengaged from said notched arm.

7. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to hold and advance a bag-section, a rotary driver mounted across the carrier, a tumbler mounted eccentrically therein, a flyplate mounted for sliding motion in the tumbler and having an edge adapted for cooperation with the carrier, a notched arm mounted on the fly-plate, a pin mounted on the carrier and adapted to cooperate with said notched arm, a gear on said tumbler, a gear engaging said gear and provided with a finger, a stopfinger adapted to move into the path of said first-mentioned finger, and a rotary cam connected with said stop-finger and serving to move it into and out of the path of the firstmentioned finger.

8. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to hold and advance a bag-section, a rotary driver'mounted across the carrier, a fly-plate carried by the driver and having sliding motion with reference thereto, grippers mounted on said fly-plate and adapted to engage the trailing flap and the upper triangles of the bag-section, and mechanism for opening and closing said grippers.

9. In a paper-bag machine, the combination, substantially as set forth, of a flat plate adapted to have the flap of a bag-section clamped against its surface, a rock -shaft mounted across said plate near said surface, a pair of cylindrical studs projecting from said rock-shaft and adapted to bear with their bodies against the surface of said plate, and mechanism for rocking. said rock-shaft.

10. In a paper-bag machine, the combination, substantially as setforth, of a flat plate adapted to have the flap of a bag-section clamped against its surface, a rock-shaft mounted across said plate near said surface, a pair of cylindrical studs projecting from said rock-shaft and adapted to bear with their bodies against the surface of said plate, tubular elastic jackets on said studs, and mechanism for rocking said rock-shaft.

11. In a paper-bag machine, the combination, substantially as set forth,,of a carrier adapted to hold and advance a bag-section, a rotary driver mounted across the carrier, a tumbler mounted eccentrically therein, a flyplate mounted for sliding motion in said tumbler, arms pivoted on said fly-plate, gripperfingers on said arms, dogs mounted on said tumbler, and fingers connected with said arms and adapted, as the fly-plate slides in the tumbler, to move said gripper-fingers 'to active and idle position.

12. In a paper-bag machine, the combination, substantially as set forth, of a carrier adapted to hold and advance a bag-section, a rotary driver mounted across the carrier, a tumbler mounted eccentrically in said driver, a fly-plate mounted for sliding motion in said tumbler, a trailing-flap gripper mounted on said fly-plate, arock-shaft mounted on the flyplate and connected with said gripper, an arm on said rock-shaft, and a cam on said tum-- bler in position to be engaged by said arm.

13. In a paper-bag machine, the combination, substantially as set forth, with a carrier adapted to hold and advance a bag-section, and a fly-plate adapted to form the diamond fold of the bag-section, of a roller mounted for movement to and from the carrier,- and a cam and connecting mechanism arranged to act 011 said roller and move the same to the carrier at the time the fly-plate has completed its folding operation and the active edge of the fly-plate is beneath the roller.

14. In a paper-bag machine, the combination, substantially as set forth, with a carrier adapted to hold and advance a bag-section, and a fly-plate adapted to form the diamond fold of the bag-section, of a sash mounted to slide to and from the carrier, a cam and connecting mechanism arranged to move said sash, arms pivoted to said sash, a roller carried by said arms, a spring tending to flex said arms and hold said roller in a direction away from the carrier, a finger connected with said arms, and a pin on said carrier adapted to engage said finger and rock said arms and carry said roller along with the carrier.

15. In a paper-bag machine, the combination, substantially as set forth, with a carrier adapted to hold and advance a bag-section, and a fly-plate adapted to form the diamond fold of the bag-section, of a sash arranged to slide to and from the carrier, a cam and connectin g mechanism arranged to give said sash its movements, arms pivoted to said sash and extending toward the carrier and forward in the direction of advance of the carrier, a spring urging said arms in a direction against that of the motion of the carrier, and a roller mounted in the free extremities of said arms.

16. In a paper-bag machine, the combination, substantially as set forth, with a carrier adapted to hold and advance a bag-section, and a fly-plate adapted to form the diamond fold of the bag-section, ofv a pair of sashes mounted for movement to and from the carrier, cams and connecting mechanism. arranged to give said sashes their movements, arms pivoted to the sash nearest the fly-plate and projecting toward the carrier and toward the fiy-plate, a roller mounted in said arms, a spring tending to hold said roller in its position nearest the fly-plate, a finger connected with said arms, a pin on the carrier adapted to cooperate with said finger and move said roller with the carrier, arms pivoted to the second sash and projecting toward the carrier and in its direction of advance, a roller mounted in said last-mentioned arms, and a spring urging said last-mentioned. roller in the direction against that of the advance of the carrier.

MURRAY SOIIENGK.

Witnesses:

J. W. SEE, M. S. BELDEN.