US3096948A

US3096948A - Winding apparatus

Info

Publication number: US3096948A
Application number: US137701A
Authority: US
Inventors: Jr Frank G Conrad
Original assignee: Scott Paper Co
Current assignee: Kimberly Clark Tissue Co
Priority date: 1961-09-12
Filing date: 1961-09-12
Publication date: 1963-07-09
Anticipated expiration: 1980-07-09

Description

y 9, 1963 r F. a. CONRAD, JR 3,096,948

WINDING APPARATUS Filed Sept. 12, 1961 3 sh t -s t 1 Fig. 2

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ATTORNE F7 5 FRAN .CON ,JR.

y 1963 F. cs. CONRAD, JR 3,0

WINDING APPARATUS Filed Sept. 12, 1961 3 Sheets-Sheet 2 L fl? Air rl D H +GlUe INV EN TOR.

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ATTOR N EY FRANK G. CONRAD,JR.

July 9, 1963 F. G. CONRAD, JR 3,096,948

WINDING APPARATUS Filed Sept. 12, 1961 5 Sheets-$heet 3 From Oi| Reservolr Fig. 8

INV EN TOR.

ATTORNEY FRANK G. CONRA'D,JR.

States atent Office asserts Patented July 9, 1963 3,096,948 WINDING APPARATUS Frank G. Conrad, in, Glenolden, Pa., assignor to Scott Paper Company, Philadelphia, Pa., a corporation of Pennsylvania Filed Sept. 12, 1961, Ser. No. 137,701 6 Claims. (Cl. 242-67 .1)

This invention relates to web winding apparatus and particularly to improved glue dispensing apparatus in association with a winding machine for depositing glue on a product roll to tie the tail end of the web to the roll.

The principal objective of this invention is reliable and accurate deposition of small quantities of glue on a finished product roll of Web material in a winding machine to secure the tail of the web to the roll. Achievement of this objective is particularly important for roll products, such as toilet tissue and roll toweling, which are placed in transparent wrappers through which sloppy or ineffective tail securement is readily apparent to the customer.

There are other devices and systems in existence for shooting small globs of glue at a product roll in a winding machine, but such prior devices have been erratic in operation and cannot be depended upon to place the proper quantities of glue at the exact spots required over an extended period of machine operation.

This invention approaches the problem of improving reliability and accuracy of a glue dispensing system along three parallel paths, each of which contributes to achievement of the desired end result. First, an improved dispenser, or gun, is employed which meters a predetermined quantity of glue for each discharge nozzle of the dispenser and which possesses a positive mechanical linkage between the several nozzle regions of the gun to insure simultaneous dispensing of the several glue charges. Second, an improved control system is used which accurately controls operation, or firing, of the glue dispenser in proper timed relationship with movement of the web onto the product roll, so that the glue reaches the roll at exactly the right spot or spots. Third, an improved glue supply system is provided.

The improved glue gun of this invention embodies a reciprocating metering bar which contains several ureter ing chambers in which predetermined quantities of glue are received. Actuation of this bar shifts the metering chambers and the glue therein in unison to dispensing positions in which compressed air is available to discharge the glue from the several chambers. Simultaneous dispensing of all glue charges is insured by moving the glue charges in unison to their discharge locations.

Reliability and accuracy in the control of operation of the glue dispenser is achieved by mechanically sensing the position of a rotating portion of the machine which is intimately associated with movement of the paper web and transmitting the signal thus obtained to the dispenser by means of a positive acting hydraulic system possessing virtually no time delay characteristics. This final sensing system is set into operation by a preliminary sensing system utilizing eleotro-pneumatic means responding to other rotating parts of the winding machine which give a rough, or coarse, indication of completion of .a product roll. In other Words, a 2-stage, coarse to fine, control system is utilized, the latter, or fine, stage of which has practically no time delay in its operation so that accurately timed firing of the glue dispensing gun is achieved.

The improved glue system of this invention is of an intermittent recirculating type having several advantageous features. The system is unpressurized during a major portion of its operating life, thereby affording little opportunity for leakage of glue from the system. The sysfrom is completely closed to preclude contact between the glue and outside air. In accordance with the invention, glue is supplied in pulses to the dispenser and a positive flushing action is obtained in the metering chambers in the dispenser, which action effectively removes air from the metering chambers and inhibits the formation of glue incrustations.

Additional objects, features, and advantages of the invention will be apparent from the following detailed description thereof in which reference is made to the accompanying drawings, wherein:

FIGURE 1 is perspective illustration of a product roll, the manufacture of which utilizes this invention;

FIGURE 2 is a diagrammatic sectional view of a winding machine embodying this invention;

FIGURE 3 is a fragmentary plan view, partially in section, of the improved glue dispenser of this invention;

FIGURES 4 and 5 are vertical sectional views of the dispenser of FIGURE 3 taken generally as indicated by lines 4-4 and 5-'5, respectively, in FIGURE 3;

FIGURE 6 is a schematic illustration of the control and glue supply systems associated with the glue dispenser; and,

FIGURES 7 and 8 are schematic illustrations of a modified control system.

The roll 11 of toilet tissue illustrated in FIGURE 1 is typical of the type of roll product with which this invention is concerned. Here, an elongated, perforated web 12 of paper is wound on a tubular core 13 and a tail portion 14 of web 12 is secured to the body of the roll by small spots 15 of glue. Glue spots 15 serve to prevent web 12 from unwinding from roll 11 during handling and packaging of the roll and insure that a complete, neat product is received by the purchaser. It is desirable that but very small quantities of glue be used in producing glue spots 15 so as to not seriously interfere with the user freeing web portion 14 to unwind the web for use. Glue spots 15 are preferably applied to roll 11 while the roll is still in the machine in which it is wound and prior to handling the roll to remove it from the winding machine.

A typical machine for winding rolls of web material from a continuously moving web 12 is illustrated in FIG- URE 2. Such machines generally include a turret 16 which is rotatable about a horizontal axis on a bearing 17 and which carries a plurality of rotatable mandrels on which product rolls of web material are wound. Two of these mandrels are identified by numerals 18 and 19, respectively. In FIGURE 2 a nearly complete product roll 11 is rotating counter-clockwise on mandrel 18 and is receiving a web 12 which passes over a bed roll 21 which is supported for rotation by a shaft 22. The machine includes means for severing the moving Web 12 as a roll is completed and for directing the leading portion of the severed web onto a core 13 carried on the next mandrel, 19. The web severing and transfer means may include a cutoff knife 23 mounted in a recess in 'bed roll 21 and capable of reciprocating movement in a radial direction with respect to the bed roll. When it is desired to sever web 12, knife 23 is moved outwardly and then retracted; this movement is effected by a mechanism which is not shown in the drawing, but which is commonly known and used in continuous winding apparatus.

The winder illustrated in FIGURE 2 is completing a product roll 11 and mandrel 18 is moving counter-clockwise from the 7:30 oclock position in which it is shown toward a 6:00 oclock position in which the finished roll will be removed from the winder. As the cutoff knife 23 in bed roll 21 moves past mandrel 19 in the 10:30 oclock position the knife will move outwardly, sever web 12 and transfer the following portion of the web to the core #13 on mandrel 19.

The winding apparatus described above is illustrative of the type of apparatus with which this invention is associated, but it is to be understood that the invention is applicable to other types of winders wherein, for example, other means are employed for severing the web and for transferring a lead portion of the severed web to another core. t can also be readily understood that web winders generally have other equipment associated therewith in addition to that illustrated in FIGURE 2. For example, the Winder may include a perforating roll over which Web 12 passes for the purpose of producing tearable regions in the web to facilitate separation of se lected lengths of web material from the finished product roll 11 during use.

Glue Dispenser The problem with which this invention is concerned is that of depositing small quantities of glue on a nearly completed product roll 11 in precisely the right location to lie beneath the severed tail of web 12 as it is rolled up onto the roll. Deposition of glue is effected by a dispenser 24 mounted on an adjustable bracket 26 in the vicinity of the 7:30 oclock position of nearly completed product roll 11.

Continuous winding machines of the type shown in FEGURE 2 normally handle a relatively wide web of material capable of producing a number of product rolls H on each mandrel. The web may be slit in the winding machine to produce finished product rolls of the desired Width or the web may be Wound as an elongated log and subsequently sliced into finished product rolls. The problem of securing the tail portion of web 12 to the completed roll in the machine is substantially the same whether the machine be Winding finished product rolls or logs.

Glue dispenser 24, which may also be termed a gun because its function is to shoot small quantities of glue onto product rolls in the winding machine, is illustrated in greater detail in FIGURES 3 through 5. The dispenser has an elongated body, or housing portion, 27 which extends substantially the entire length of mandrel 18 and is equipped with a plurality of nozzles 28 through "which glue is dispensed. One or more nozzles 28 are provided for each finished product roll along the mandrel length, so a single dispenser may have 20 or more such nozzles. A portion of dispenser 24 between its ends has been omitted in FIGURE 3 to simplify the illustration.

Disposed within dispenser housing 27 is a metering bar 29 which measures the quantities of glue to be dispensed through nozzles 28 and which controls actual dispensing of these glue quantities. Metering bar 29 has a plurality of transverse passages drilled therein which function as metering chambers 31. Bar 29 is mounted for reciprocating movement in a longitudinal path so that metering chambers 31 can be disposed in either of two positions. In one position of bar 29' (position shown in FIGURES 3 and 4 each metering chamber 31 is in alignment with a set of

glue passages

32 and 33. In the other bar position each metering chamber is in alignment with a compressed air passage 34 and an outlet passage 36 communicating with a nozzle 28 (see FIGURES 3 and There are provided a set of

glue passages

32 and 33 and one air passage 34, one outlet passage 36, and one metering chamber 31 for each dispensing nozzle 28, Glue is conveyed to the several metering chambers 31 from a supply header passage 37 communicating with the several glue inlet passages 32. Similarly, glue and air flowing from the several metering chambers 31 enter a glue outlet header passage '38 communicating with each of the glue outlet passages 33. It readily can be appreciated that as glue is pumped through passages 32 and into passages 33 each metering chamber 31 will become filled with a predetermined quantity of glue, the quantity being determined by the internal volume of each metering chamber.

The predetermined quantity of glue in each metering chamber 31 is trapped in its chamber and then discharged therefrom by shifting metering bar 29 to the right from the position shown in FIGURE 3 to the other position of bar 29 in which the metering chambers 31 are aligned with air passages 34. Each air passage 34 is connected to a source of compressed air by means of an air header passage 39 running lengthwise of the dispenser body 27. When metering bar 29 is moved to the dispensing position, compressed air flowing through air passages 34 forces the glue in each metering chamber 31 through passages 36 in alignment with the metering chambers and out through nozzles 28. Sufficient air pressure is used to assure rapid and accurate travel of the several glue quantities from nozzles 28 onto the Web material on product roll 11.

When metering bar 29 is returned to the fill position of FIGURE 3 and glue is again pumped through

passages

32 and 33 such air as may have been trapped in metering chambers 31 is carried therefrom and out of dispenser 24 by the glue circulated therethrough. The quantity of glue circulated during each refilling operation is substantially in excess of that required to refill metering chambers 31 to assure complete purging of air from the metering chambers and to carry away such small flakes or dried particles of glue as may tend to form in the metering chambers. As a result, reliable, consistent measuring of the several glue charges is possible over an extended period of time.

Movement of metering bar 29 is preferably effected by means of a hydraulic actuating system including a piston 41 carried in a cylindrical chamber 42 in dispenser housing 27. Piston 41 is preferably directly connected to metering bar 29 by means of a link 43 and the piston and the metering bar are biased to the position shown in FIGURE 3 by means of a spring 44 disposed within chamber 42 and bearing against the back face of piston 41. The front face of piston 41 is exposed to a body of hydraulic fluid 46 which extends through a conduit 4'7 connecting dispenser 24 with other elements of the dispenser actuating system. In operation, hydraulic fluid forced through conduit 4 into dispenser 24 has the effect of shifting piston 41 and metering bar 29 to the right, as viewed in FIGURE 3. Conversely, withdrawing hydraulic fluid from the dispenser via conduit 47 permits spring 44 to return metering bar 29 to the position shown in FIGURE 3. Suitable stops (not shown), which may be adjustable, are preferably provided for limiting the extent of movement of metering bar 29 to assure alignment of metering chambers 31 with their respective glue and air passages in the two positions of the metering bar.

It will be noted that the general construction of dispenser 24 is such as to insure simultaneous discharge of the several uniformly measured quantities of glue which are to be deposited on the finished roll 11. The positive linking together of all of the metering chambers 31 through metering bar 29 renders it impossible for the glue charge in one metering chamber to be dispensed prior to any other glue charge and, consequently, all of the glue quantities are projected toward the product roll at the same instant to reach the near completed roll in uniform circumferential locations on the roll. Thus, firing of the glue dispenser can be timed to deposit all of the quantities of glue in position to secure the end-most portion of the tail end of the Web 12 without incurring the possibility of some of the glue quantities missing their intended positions on the product roll. It should be obvious that, although metering bar 29 is shown and described as a unitary element, the bar can be made up of interlocked segments and perform the same function.

Control Systems Control of the improved glue dispenser 24 is effected,

in accordance with this invention, by means of a 2-stage control system which is illustrated schematically in FIG- URE 6.

The actuating portion of the control system, i.e., that portion which actuates the glue dispenser 24, includes a hydraulic system in which conduit 47 connects glue dispenser 24 to a pump 48. The latter includes a cylinder 49 having a piston 51 therein which is attached to a connecting rod 52 having a cam follower roller 53 mounted at one end thereof. Pump 43 is pivotally mounted at 54 for movement from the full line position shown to another position indicated by dot and dash lines, which constitute, respectively, inactive and active positions of the pump. When pump 48 is moved to its active position, roller 53 is positioned within the path of movement of a cam 56 having a rise portion 57 adapted to engage roller 53 and effect upward movement of connecting rod 52 and piston 51. Upward movement of piston 51 is reflected in displacement of hydraulic fluid through conduit 47 and consequent movement of piston 41 in the glue dispenser 24 (see FIGURE 3). Cam 56 is capable of actuating glue dispenser 24 in this manner once during each revolution of the cam Whenever pump 49 is in its active position.

When pump 49 is moved to its active position the actuating system of which it is a part can be said to be conditioned for operation. Cam 56, in effect, produces a control stimulus which triggers operation of the glue dispenser actuating system.

Actuation of glue dispenser 24 must be carefully timed with respect to movement of web 12 into roll 11 and also accurately timed with respect to operation of the cutoff means which severs web 12 as roll 11 is completed. In order to achieve the degree of accuracy required, cam 56 is intimately associated with a portion of the winding machine which moves with the moving web and the position of which is an accurate reflection of the position of the web. This portion of the machine may be a roll over which the web passes and which is driven so that its surface velocity is the same as the velocity of the web. This may be a perforator roll, mentioned previously, but it is preferred that cam 56 be associated with bed roll 21 of the winding machine because the surface of this roll is moving at the same velocity as the web being wound and because a positive relationship exists between roll 21 and cutoff knife 23. Bed roll 21 makes a number of revolutions during the win-ding of a product roll 11 or, stated diflerently, the bed roll undergoes one revolution during the feeding of a predetermined length of web which is less than the total length of web in a completed product roll 11. Consequently, the rotative position of bed roll 21 is an accurate indication of the position of any given portion of the web 12 moving over roll 21 during each roll revolution. Thus, once the dispenser actuating system is conditioned for operation near the end of a web wind, i.e., near the completion of a product roll 11, actuation of pump 49 can be accurately timed with respect to movement of the tail end of web 12 by properly positioning cam 56 with respect to bed roll 21 and cutoff knife 23. The association between cam 56 and bed roll 21, or such other roll with which the cam is associated, is preferably established by securing cam 56 directly to shaft by which the roll is rotatably supported, in this case shaft 22 (see FIGURE 2).

The positive mechanical connection between cam 56 and pump 49 and the equally positive hydraulic connection between pump 49 and the glue dispenser 24 affords virtually no time lag or variation between the control stimulus provided by cam 56 and actuation of dispenser 24. Maintenance of a positive acting hydraulic system free of air or other compressible gases can be insured by coupling to the system an air loaded fluid reservoir 58 having a restricted flow orifice 59 in the conduit providing communication between the reservoir and conduit 47 of the actuating system. Orifice 59 permits make-up fluid to enter the system during inactive periods, yet prevents any appreciable quantity of fluid from being forced from the system during the short periods during which pump 49 is operated.

The need [for accurate and reliable actuation of glue dispenser 24 can perhaps best be appreciated through reference to a specific illustration. In the winding of toilet tissue, for example, web 12 may be moving at a velocity of as high as 1,000 feet per minute. At this velocity the web moves one inch every .005 second. It. should be apparent that extreme accuracy must be maintained if glue dispenser 24 is to deposit glue onto product roll 1.1 in position to secure the last sheet of tissue to the roll, which sheet has a length of approximately 4 /2 inches. The problem is analogous to that which would be encountered in attempting to spray a small quantity of paint from a fixed spray gun onto one door panel only of an automobile moving by at a speed of miles per hour. The dispenser actuating system of which pump 49 is a part is capable of functioning with the accuracy required by such conditions.

The control system is completed by a coarse, or rough, sensing system for determining when a product roll 11 is nearly completed and by means set in motion by this coarse sensing system for conditioning the dispenser actuating system for operation. The conditioning means preferably takes the form of an air motor 61 comprising a cylinder 62 having a piston 63 therein which is connected by means of a rod 64 to connecting rod 52 of pump 49. Air is supplied to cylinder 62 through

conduits

66 and 67 under control of a 4 way, solenoid valve 68. When valve 68 is energized it directs air through conduit 66 and opens conduit 67 to atmosphere, causing piston 63 to move to the right for moving pump 49 to its active position. Conversely, valve 68, when de-energized, directs air through conduit 67 and opens conduit 66 to atmosphere, effecting return of piston 63 and pump 49 to their solid line positions of FIGURE 6.

Energization of valve 68 is eifected by electric current supplied thereto through two supply leads 71 and 72, the latter of which has a switch 73 therein. Switch 73, acting in cooperation with a cam 74, produces a control stimulus for activating air motor 61 and forms a part of the coarse sensing system. Cam 74 is mounted on a rotatable shaft 76 which makes one revolution during the winding of a finished roll 11. Shaft 76 is connected to other moving portions of the winding machine, such as bed roll shaft 22, by suitable means, such as a reduction gearing system 77. Although a coarse sensing system such as that con stituted by cam 74 and switch 73 does not possess sufficient accuracy to directly control operation of the glue dispenser 24, it, nevertheless, is adequate to perform the function of controlling the conditioning of the more accurate actuating system comprising hydraulic pump 49 and cam 56. i

The coarse sensing system of this control is also em ployed to control the operation of apparatus for supplying glue to dispenser 24. As shown in FIGURE 6, the glue system includes a closed reservoir 81 having a pump 82 associated therewith for withdrawing glue from the reservoir and circulating glue to dispenser 24 via a supply conduit 83 and back to reservoir 81 through a return conduit 84. Glue returning to reservoir 81 flows through a strainer basket 86 to remove any air bubbles and lumps or foreign particles therefrom before falling into the lower portion of the reservoir.

Glue conduits

83 and 84 communicate respectively with glue header passages 37 and 3d in the body of glue dispenser 24 (see FIGURE 4).

Glue pump 82 is operated intermittently to circulate glue through the passages in dispenser 24. The capacity of the pump for each operation is substantially in excess of the quantity of glue necessary to fill all of the metering chambers 31, so these metering chambers are purged and flushed by the excess glue circulated therethrough. By supplying glue to dispenser 24 in intermittent fashion the glue system, including the several passages in dispenser 24, contain pressurized glue only during short periods of time, which periods are substantially less than the total operating time of the winding machine. Consequently, little opportunity is afforded the glue to leak past sealing surfaces within the dispenser and cause malfunction of the dispenser. It will also be noted that the glue circulating system is entirely closed and glue does not come in contact with outside air. This arrangement reduces the tendency for the glue to coagulate and plug the various passages in the glue system.

Glue pump 82 is actuated by compressed air supplied intermittently under control of a solenoid valve 87 in an air supply line 88 connected to the pump. Valve 87 is opened when energized by electric current supplied through

leads

89 and 90. Lead 90 includes a switch 91 which, together with a rotatable cam 92, forms a part of the coarse sensing system. Like cam 74, cam 92 is mounted for rotation on shaft 76 which, as mentioned previously, makes one revolution during the winding of a product roll 11. It will be noted that the switch actuating land, or rise, 03 on cam 92 angularly precedes a similar rise 94 on cam '74. The angular differential between cam lands 93 and 94 is exaggerated in FIGURE 6 for clarity of illustration. The actual differential need be only a few angular degrees, just sufficient to provide for actuation of glue pump 82 in advance of actuation of dispenser 24. Pump 82 is operated sufficiently in advance of actuation of dispenser 2.4 to insure that suflicient glue has been circulated through the dispenser to completely fill all of the metering chambers 31 in the dispenser metering bar 29.

Actual dispensing of glue from dispenser 24 takes place, as described previously, by virtue of compressed air flowing through metering chamber 31 in the dispenser. Air is supplied to air passages 34 and air header 39 by means of an air line 96 which is connected to a suitable source of compressed air. This air system may be continuously active and, therefore, requires no separate control system.

Summary of Operation Operation of the control system for dispenser 24 can be briefly summarized as follows:

As the winding machine nears the end of a web wind to produce a product roll 11, the coarse sensing system, comprising switch-cam combinations 9192 and 7374, sends control stimuli in close sequence, respectively, to the glue pump 82 and to the conditioning system, which includes air motor 61. Thus, metering chambers 31 in the glue dispenser are filled and the dispenser actuating system is conditioned for operation by virtue of air motor 61 moving pump 49 into its active position in which follower roller 53 is engageable by cam 56. When bed roll 21 arrives at the rotative position in which the length of web 12 between the product roll 11 and cutoff knife 23 is just suflicient to wrap once around the product roll, cam 56 actuates pump 49 to cause metering bar 29 to shift to its dispensing position and glue is blown from nozzles 28 onto the product roll. The timing of dispenser actuation is such as to cause glue to be deposited in several spots 15 along the length of roll 11 in position to adhere to the tail end of web 12 after the web has been severed and the tail has wrapped around the roll.

Modification FIGURES 7 and 8 illustrate a modified control system for glue dispenser 24. Parts common to this embodiment and to the embodiment previously described are identified by like reference numerals.

There may be certain applications wherein, due to space limitations or other considerations, it is incovenient to mount the conditioning means air motor 61 in the vicinity of cam 56. For such applications the modified control means of FIGURES 7 and 8 provides a reliable system for conditioning the dispenser actuating system for oporation and one which may be located remotely of fine sensing control cam 56 and an actuating pump 101 as sociated with the cam. Although functioning in much the same manner as pump 49 in the preceding embodiment to supply hydraulic fluid to dispenser 24 for the purpose of actuating the dispenser, pump 101 may be stationarily mounted and its cam follower 102 and piston 103 are conditioned for actuation by changing the quantity of hydraulic fluid 46 in the actuating system. The follower 102 and piston 103 are biased by means of a spring 104 to their inactive positions, i.e., positions in which follower 102 is outside the path of cam rise 57. This position of these elements is illustrated in FIGURE 7.

It will be noted that the actuating system utilizing hydraulic fluid 6 includes a conduit 106 communicating with pump 101 and a displacement chamber 107 which is connected by means of a conduit 10% with a fluid reservoir (not shown). Displacement chamber 107 contains a quantity of hydraulic fluid which is in excess of the working volume of the chamber in pump 101. This quantity of fluid is displaceable from chamber 107 by a piston 109 which is actuated by an air motor 111 having a piston 112 connected to displacement piston 109. As in the preceding embodiment, air motor 111 forms a part of a conditioning means and is actuated pneumatically under control of a solenoid valve 63.

Energization of valve 68 results in air being admitted to air motor 111 through conduit 66 so that piston 112 is moved downwardly to the position shown in FIGURE 8. Piston 109 is thereby driven downwardly into displacement chamber 107, displacing hydraulic fluid 46 from that chamber into the actuating system including pump 1-01 and glue dispenser 24. The resulting increase in the volume of fluid between pump 101 and dispenser 24 causes pump piston 103 to be displaced, to the left, to the position shown in FIGURE 8, in which cam follower 102 is in position to be engaged by rise 57 on cam 56. This is the active position of cam follower 102 and when the components of the actuating system are in this position the actuating system is conditioned for operation. As in the preceding embodiment, actuation of pump 101 by cam 56 results in actuation of glue dis penser 24 and the dispensing of glue therefrom. Following actuation of glue dispenser 24, de-energization of valve 68 results in air motor 111 withdrawing dispenser piston 109 from chamber 107, permitting cam follower 102 to be retracted from its active position by spring 104.

To insure reliable operation of the conditioning and actuating systems illustrated in FIGURES 7 and 8 certain relationships should be maintained. First, the hydraulic force required to overcome the bias of spring 104- and move cam follower 102 to its active position should necessarily be less than the hydraulic force involved in actuating dispenser 24, so that movement of displacement piston 10% into chamber 1117 results in conditioning of pump 101 for operation, but does not result in actuation of the lue dispenser. It is also essential that the areapressure relationship between air motor piston 112 and the air pressure available for operating this piston be substantially in excess of the area-pressure relationship of displacement piston and hydraulic fluid 46 to insure that air motor 111 is capable of resisting upward displacement of displacement piston 109 against the hydrau-lic forces occurring in the actuating system upon operation of pump 101.

It should be apparent that the embodiment of FIG- URES 7 and 8 offers the advantage of flexibility of installation with respect to the conditioning means comprising air motor 111 and displacement piston-chamber combination 10i-10'7. Conduit 106 may be made of any desired length and configuration so that air motor 111 and actuating pump 101 may be located in different, remote locations on the winding machine.

Although the invention has been illustrated by reference to but two embodiments thereof, it is to be understood that the invention is not so limited and that further changes and modifications may be made in the illustrated apparatus without departing from the spirit and scope of the invention.

What I claim is:

1. In web winding apparatus, the combination with a mandrel on which a web is wound, and a glue dispenser positioned to deposit glue on the web wound on said mandrel, of means for controlling operation of said glue dispenser, said controlling means comprising a hydraulic actuating system connected to said glue dispenser and including a pump, a rotatable cam adapted to actuate said pump, means rotating said cam at a velocity directly proportioned to the velocity of the web being wound, said pump including a cam follower movable from an inactive position out of the path of movement of said cam to an active position within the path of movement of said cam, and means responsive to the feeding of substantially the total desired length of web to said mandrel for moving said cam fol-lower to its active position.

2. In web winding apparatus, the combination with a mandrel on which a web is wound, a glue dispenser positioned to deposit glue on the web wound on said mandrel, and a roll over which the web is fed to said mandrel, said roll undergoing one revolution during the feeding of a predetermined length of web less than the total length of web to be fed to said mandrel, of means for controlling operation of said glue dispenser, said means comprising a hydraulic actuating system connected to said glue dispenser and including a pump, cam means rotatable with said roll for actuating said pump, means supporting said pump for movement between an active position and an inactive position with respect to said cam and means responsive to the feeding of substantially the total desired length of web to said mandrel for moving said pump to its active position.

3. In web winding apparatus, the combination with a mandrel on which a web is wound, a glue dispenser positioned to deposit glue on the web wound on said mandrel, a roll over which the web is fed to said mandrel, said roll undergoing one revolution during the feeding of a pre determined length of Web less than the total length of web to be fed to said mandrel, and means for intermittently supplying glue to said dispenser, of means for controlling operation of said glue dispenser, said means com-- prising a hydraulic actuating system connected to said glue dispenser and including a pump, cam means rotatable with said roll for actuating said pump, means supporting said pump for movement between an active position and an inactive position with respect to said cam and means responsive to the feeding of substantially the total desired length of web to said mandrel for activating said glue supply means and for moving said pump to its active position.

4. In combination in a web Winding machine, a dis penser for depositing glue on a wound roll of Web material for tying the tail end of said web to said roll, pump means for intermittently supplying glue to said dispenser, a fine sensing system capable of producing a number of control stimuli during a web wind, an actuating system connecting said fine sensing system and said dispenser and capable when conditioned of actuating said dispenser upon receiving a control stimulus from said fine sensing systern, a coarse sensing system capable of producing a control stimulus near the end of a web wind, and means operatively connecting said coarse sensing system to said pump and to said actuating system, respectively, for initiating operation of said pump and for conditioning said actuating system upon receiving a control stimulus from said coarse sensing system.

5. In combination in a web winding machine, a dispenser for depositing glue on a wound roll of web material for tying the tail end of said web to said roll, said dispenser comprising an elongated metering bar having a plurality of glue chambers therein, said metering bar being adapted to alternatively occupy first and second longitudinally spaced positions, means providing glue inlet passages on opposite sides of said bar, said glue chambers being in alignment with said glue passages when said bar is in its first position, and means providing a plurality of passages for compressed air, said glue chambers being in alignment with said air passages when said bar is in its second position, and means for controlling operation of said glue dispenser, said controlling means comprising a hydraulic actuating system connected to the metering bar of said dispenser and including a pump, a rotatable cam adapted to actuate said pump, means rotating said cam at a velocity directly proportioned to the velocity of the Web being wound, said pump including a cam follower movable t-rom an inactive position out of the path of movement of said cam to an active position within the path of movement of said cam, and means responsive to the feeding of substantially the total desired length of web to said mandrel for moving said cam follower to its active position.

6. In combination in :a Web winding machine, a dispenser for depositing glue on a wound roll of web material for tying the tail end of said web to said roll, said dispenser comprising an elongated metering bar having a plurality of glue chambers therein, said metering bar being adapted to alternatively occupy first and second longitudinally spaced positions, means providing glue inlet passages and glue outlet passages on opposite sides of said bar, said glue chambers being in alignment with said glue passages when said bar is in its first position, and means providing a plurality of passages for compressed air, said gl-ue chambers being in alignment with said air passages when said bar is in its second position, pump means for intermittently circulating glue through said glue passages and said glue chambers of said dispenser, a fine sensing system capable of producing a number of control stimuli during a web Wind, an actuating system connecting said fine sensing system and said dispenser and capable when conditioned of actuating the metering bar of said dispenser from its first position to its second position and back to its first position, a coarse sensing system capable of producing a control stimulus near the end of a web wind, and means operatively connecting said coarse sensing system to said pump means and to said actuating means, respectively, for initiating operation of said pump means and for conditioning said actuating means upon receiving a control stimulus from said coarse sensing system.

References Cited in the file of this patent UNITED STATES PATENTS 982,140 Keighley Jan. 17, 1911 1,528,022 Keiser Mar. 3, 1925 2,020,916 Still Nov. 12, 1935 2,357,976 Roesen Sept. 12, 1944 2,586,832 Kohler Feb. 26, 1952 2,699,279 Dodge et al. Jan. 11, 1955 2,992,786 Scusa July 18, 1961 2,995,314 Nystrand Aug. 8, 1961

Claims

1. IN WEB WINDING APPARATUS, THE COMBINATION WITH A MANDREL ON WHICH A WEB WOUND, AND A GLUE DISPENSER POSITIONED TO DEPOSIT GLUE ON THE WEB WOUND ON SAID MANDREL, OF MEANS FOR CONTROLLING OPERATION OF SAID GLUE DISPENSER, SAID CONTROLLING MEANS COMPRISING A HYDRAULIC ACTUATING SYSTEM CONNECTED TO SAID GLUE DISPENSER AND INCLUDING A PUMP, A ROTATABLE CAM ADAPTED TO ACTUATE SAID PUMP, MEANS ROTATING SAID CAM AT A VELOCITY DIRECTLY PROPORTIONED TO THE VELOCITY OF THE WEB BEING WOUND, SAID PUMP INCLUDING A CAM FOLLOWER MOVABLE FROM AN INACTIVE POSITION OUT OF THE PATH OF MOVEMENT OF SAID CAM TO AN ACTIVE POSITION WITHIN THE PATH OF MOVEMENT OF SAID CAM, AND MEANS RESPONSIVE TO THE FEEDINGS OF SUBSTANTIALLY THE TOTAL DESIRED LENGTH OF WEB TO SAID MANDREL FOR MOVING SAID CAM FOLLOWER TO ITS ACTIVE POSITION.