CA1045811A - Glue applying assembly for multiple web-fed paper handling apparatus - Google Patents
Glue applying assembly for multiple web-fed paper handling apparatusInfo
- Publication number
- CA1045811A CA1045811A CA205,321A CA205321A CA1045811A CA 1045811 A CA1045811 A CA 1045811A CA 205321 A CA205321 A CA 205321A CA 1045811 A CA1045811 A CA 1045811A
- Authority
- CA
- Canada
- Prior art keywords
- glue
- web
- applicator
- head
- apertured
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
- B05C5/0275—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve
Landscapes
- Coating Apparatus (AREA)
Abstract
GLUE APPLYING ASSEMBLY FOR MULTIPLE WEB-FED
PAPER HANDLING APPARATUS
ABSTRACT OF THE DISCLOSURE
A non-pressurized, gravity-fed, pneumatically con-trolled glue applicator assembly is operable to apply at least one uniform stripe of glue to a moving web of material during use thereof. The assembly includes a hollow cylindrical appli-cator head with a glue applying orifice therein connected to an overhead glue supply by means permitting substantially unre-stricted, gravity-induced glue flow to the head. Pneumatically shiftable, apertured sleeve means is carried on the head ex-ternally thereof for precisely controlling glue flow and prevent-ing hardening of the glue when the assembly is not in use. Dur-ing application, a continuously moving web is positioned in lightly touching relationship to the head such that glue is con-tinuously wiped or pulled from the orifice thereof; in this fashion, glue flow is automatically adjusted when web speed is varied to thereby insure uniform application during all modes of operation.
PAPER HANDLING APPARATUS
ABSTRACT OF THE DISCLOSURE
A non-pressurized, gravity-fed, pneumatically con-trolled glue applicator assembly is operable to apply at least one uniform stripe of glue to a moving web of material during use thereof. The assembly includes a hollow cylindrical appli-cator head with a glue applying orifice therein connected to an overhead glue supply by means permitting substantially unre-stricted, gravity-induced glue flow to the head. Pneumatically shiftable, apertured sleeve means is carried on the head ex-ternally thereof for precisely controlling glue flow and prevent-ing hardening of the glue when the assembly is not in use. Dur-ing application, a continuously moving web is positioned in lightly touching relationship to the head such that glue is con-tinuously wiped or pulled from the orifice thereof; in this fashion, glue flow is automatically adjusted when web speed is varied to thereby insure uniform application during all modes of operation.
Description
GLUE APP~YING ASSEMBLY FOR MwrLTIpLE WEB-FED
__PAPER HANDLING APPARATUS
BACKGROUND
This invention relates to a glue applying assembly which is especially adapted for use with multiple web-fed paper handling devices such as collators or the like in order to attach moving, superimposed paper webs in a continuous fashion. How-ever, the structure has utility in connection with various types of machines where there is a need to apply a relatively narrow, continuous line of glue to a moving strip or sheet of material.
More particularly, the invention is concerned with a precisely controllable, nonpressurized assembly wherein gravity actuated glue feed is employed yet the assembly is capable of automati-cally compensating for varying web speeds to maintain uniform glue application during all operational modes.
Glue applicator assemblies for use with web collators have heretofore generally been of the pressurized variety where-in glue under mechanical pressure is forced through a nozzle or -orifice onto a moving web of paper or other material. These devices utilized pressurizing means such as positive displace-ment pumps i~ith an attempt being made to correlate the pump speed with the rate of web travel to provide compensation for changing web speeds. Additionally, these units were normally pro-vided with glue feeder lines of relatively small diameter extend-ing from a central supply to insure that adequate fluid pressure was maintained at all times throughout the system.
In practice it was found that these prior glue appli-cator assemblies involved important constructional and operational deficiencies primarily attributable to the inherent limitations imposed on the system by internal pressurization of glue apply-ing head. First of all, for reasons of the economy of construc-~b` .
-1- q~
(Dkt. #15180) -.
~0458~1 tion and ease of maintenance, these units were generally pro-vided with a plurality of pressurization pumps which were incor-porated into a single area in the overall collator, which re-sulted in relatively long feeder lines leading to the gluing stations thereof.
Hence, by virtue of this construction, the overall glue applicator assembly incorporated into the collator was costly, unduly complex and prone to failure.
Another related problem stemmed from the fact that there was no way to effectively control glue ~low with a de-sirable degree of precision. Specifically, when such pressurized units were shutdown, back pressure created by the long, rela-tively small diameter feeder lines and glue application nozzles tended to cause "bleeding" at the end of the lines adjacent the paper webs. As can be appreciated, such an undesirable feature caused dripping or other leakage of glue onto proximal machinery or flooring, thus creating a considerable problem requiring fre-quent clean-up and maintenance.
Still further problems occurred when it was attempted to commence gluing operation with these prior units, or when ad-justment of glue flow therefrom was found necessary in order to compensate for varying web speeds. In particular, an undesirable lag in glue flow often occurred upon start-up, because it was necessary for adequate pressure to buildup within the system be-fore glue began to uniformly flow from the orifices or nozzles thereof. Similarly, precise adjustment of glue flow during opera- -tion was extremely difficult to achieve because of the necessity .. . . .
of changing the pressure throughout the glue applying system be-fore modification of glue flow resulted.
Therefore, there has been a need in the art for a low-cost, non-pressurized glue applicator assembly for use in web-fed paper handling devices that is capable of effectively '" ' .', ' -- .. - ~ .' ' - ' :,' . :, , ' - ' ' ~045811 and precisely controlling glue flow under varying web speeds and all other optional operational modes of the device.
According the the present invention, an applicator is provided which is adapted to be interconnected to a .
supply of fluid substance for applying a strip of the latter to a m~ving web, said applicator comprising: an elongated .
applicator head adapted to be positioned proximal to said web and having a forward fluid substance applying section adjacent said web and a rearward section presenting a bearing surface, said forward section including a hollow chamber defined in part by a wall having an orifice there-through of relatively small diameter for the application of said fluid substance; slidable means positioned on said bearing surface and axially shiftable therealong; relatively thin, apertured means in covering disposition to.said fluid substance applying section and axially shiftable between a first operative position wherein said aperture is registered with said orifice, and a second flow-preventing position where said orifice is covered to preclude fluid flow : 20 therefrom; means coupling said apertured means and slidable means for axial movement thereof in unison, said coupling means precluding significant rotational movement of the .
apertured means relative to said forward section; and means for selectively shifting said slidable means, including: first fluid pressure means couplea to said slidable means for axially shifting said apertured means to said first position when fluid pressure is applied thereto; and second fluid pressure means coupled to said slidable means for axially shifting said apertured means to said second position when fluid pressure is applied thereto.
` ,-~, 1 _ _, j , . .
Preferably, an elongated tubular delivery member is mount~d on said applicator and in communication with said hollow chamber, said tubular delivery member being adapted for connection to a supply of fluid substance and of dimensions permitting gravity induced fluid flow from said supply to said chamber.
The aperture means comprises an apertured sleeve substantially surrounding the forward section.
In a further preferred embodiment, the first and second fluid pressure actuatable me~ans are pneumatically operated.
In the Drawings: -Figure 1 is a fragmentary, front elevational view ofa gluing station in web-fed paper handling apparatus embodying a glue-applying assembly in accordance with the present invention;
Figure 2 is a fragmentary, side elevational view of the apparatus shown in Figure l;
Figure 3 is a fragmentary, side elevational view of ~0 the applicator head and associated glue flow control assembly, showing the cylindrical flow control sleeve disposed about the applicator head in flow preventing disposition;
Figure 4 is a fragmentary view in partial vertical section of the applicator head as shown in Figure 3 with glue supply line means being illustrated in communication with the control assembly;
Figure 5 i9 a fragmentary view in partial vertical section of the applicator head shown in Figure 4 with the flow control sleeve being illustrated in the shifted position thereof permitting flow of glue from the glue applying .'' ' .
,, ~ ~ ' .
- , . . . . .
.. . .. . ..
orifices of the applicator head; -Figure 6 is an end elevational view of the applicator and associated flow control assembly shown in Figures 3-5;
Figure 7 (on the shee.t of Figure 1) is an end elevational view of a moving web of paper with a glue applicator head of the present invention in tangential, glue applying relationship thereto, with a leaf spring component being provided to maintain the desired relative relationship of the web and applicator head;
Figure 8 is an end elevational view of a glue applicator head in association with a moving web, a roiler being illustrated in this instance to maintain the web in tangential relationship to the applicator;
Figure 9 (on the sheet of Figure 1) is an end elevational view of a moving web and glue applicator head in accordance with the invention, with the web being shown as partially wrapped about the head in order to facilitate glue application thereto; and Figure 10 (on the sheet of Figure 1) is a fragmentary, greatly enlarged view in vertical section of a movable web in conjunction with a glue applicator head, shown with the glue-applying orifices of the latter in proper relation to facilitate glue discharge therefrom by the wiping or pulling action of the moving web.
DETAILED DESCRIPTION
Referring now to the arawings, Figure 1 illustrated a glue-applying station of a multiple web-fed paper collator wherein the overall unit is referred to by the numeral 10. It is to be understood that unit 10 ..
generally consists of a plurality of paper handling ~-:
A
i~4~iB11 and conveying stations which are generally in spaced parallel relationship to facilitate continuous, high-speed handling of elongated webs of paper. However, for - illustrative purposes, only the glue application segment thereof is shown which includes drive and idler rollers 12 and 14 respectively mounted i~ cantilever fashion on upright wall 16. Roller 12 serves to move elongated web 18 through the gluing station depicted in Figure 1 and may be driven at a variable speed to change the forward speed thereof.
Briefly, the glue applicator assembly of the present invention includes an inverted container 20 for receiving a supply : ~ -.
~ , .. .
~ ~
. .
. . -. , : . . . : .
.. . . .. . . . .. .. ..
. - . . : . . . .
~0~8:11 of fluid glue. Container 20 is positioned above web 18 and the remainder of the gluing apparatus for gravitational delivery thereof to the gluing stations. In practice, supply 20 preferably comprises a removable bottle of commercially available glue which is adapted to be positioned upside-down on lateral support 22 with the latter being fixedly secured to upstanding wall 16.
A rotatable glue applica.tor head assembly 24 supported by a hollow tube 30 extending through an aperture in sidewall 16 is held in fixed position relative to wall 16 by locking collar 26 around the support tube on the back side of wa.ll 16.
As shown in Figures 1 a.nd 2, head assembly 24 is in this instance secured in glue-applying disposition such that moving web 18 is in lightly touching, generally tangential relationship thereto.
The overall gluing assembly further includes flexible tubing 28 of relatively large diameter which serves to interconnect supply 20 and head assembly 24 via the hollow support pipe to tube 30 and permit substantia.lly unrestricted fluid flow therebetween.
Referring now to Figures 3-5, glue head assembly 24 is illustrated in specific detail. In general it includes the elongated, metallic, tubular support and glue delivery pipe 30 which communicates with hollow, cylindrical glue-applying head 32 and extends through apertured sidewall 16 as described. A
stretch of flexible tubing 28 is telescoped into pipe 30 at the rearward end thereof and a leakproof seal is provided by com-pressible 0-ring 34 within the outer end of tube 30. Tubing 28 is in turn connected to overhead supply 20 to permit gravity in-duced glue flow therefrom. :
An integral, enlarged, stepped boss portion 36 is pro-vided at the forward end of pipe 30 and includes an annular seat~
ing flange or lip 38 for the purpose of engaging the rearmost edges of the cylindrical sidewall of removable head 32. Addi-tionally, the forward face of boss 36 has a. series of four circu-larly arranged, tapped apertures for the reception of threaded .. . . ..
.. ....
~0 4S~ll bolts 40. These bolts extend through the planar front wall of head 32 and hollow chamber 42 to releasably secure the head to .-boss portion 36.
A second enlarged a.nnula.r portion 44 of b~ss 36 ex-tends rearwardly from flange 38 with the rearmost wall 45 of portion 44 serving to define i~ part a.n annular space or groove 46. An enlarged structura.lly distinct collar 48 is fixedly secured about pipe 30 rearwardly of second annular portion 44 in spa.ced rela.tionship~therefrom. Collar 48 is held in fixed position on pipe 30 by means of a circular metallic clip 50 thereon engaging the outer face of the collar and is provided with an annular groove in the inner surface of the same for re-ceiving an O-ring seal 51 abutting the rearmost upstanding face of stepped boss 36.
As can be seen, collar 48 and second annula.r portion 44 coopera.tively serve to define an annular recessed space or . groove 46. The la.tter is bounded internally by a smooth, metallic bearing surface 52 which also forms a part of the axial sidewall ; of boss 36.
Head 32 is further provided with a desired number of glue-applying orifices 54 which extend through the cylindrical sidewall thereof in communication with interna.l glue chamber 42.
In this regard, it should be noted that any number of orifices .
54 can be provided depending only on the number of stripes of glue which need to be deposited on a given web 18. As can readily ;
be understood from a study of Figures 4-5, glue from supply 20 flows under the influence of gravity through tubing 28 and pipe . .
30 and into glue chamber 42 of head 32. Finally, glue flows out orifices 54 of relatively small diameter during glue-applying 30 procedures.
It is to be understood that although the assembly dis- ..
closed herein can be pressurized if desired, in preferred forms - .:
,. ;
. .. .
.
~045811 of the invention, no pressurization thereof is needed. This re-sults from the use of flexible tubing 28, delivery pipe 30, and chamber 42 of dimensions such that glue flows to head 32 in a substa.ntially unrestricted gravity induced manner. Thus, when supply 20 is positioned above overall glue head assembly 24, adequate amounts of flue are continually fed into chamber 42 without the need of system pressurization. Moreover, because orifices 54 are of relatively small diameter, the only resistance to flow of glue throughout the entire system occurs at these points. Hence, glue flowing from supply 20 through the entire apparatus is prevented from freely flowing only at the point of ultimate application thereof to web 18. In order to lessen this resistance and facilitate glue application, the internal sidewall of head 32 proximal to the orifices 54 is internally milled as at 55 to reduce the length of the orifices and conse-quently the restriction imposed upon glue flow.
An externally mounted, movable, annular collar member - -. 56 is axially shiftable on the rearward portion of head 32 in annular groove 46. Collar 56 has a main body 64 and integral, .
20 opposed, annular bearing flanges 57 and 58 which a.re adapted to slidably enga.ge the outer cylindrical surfaces of collar 48 and ~ .
second annular portion 44 respectively. For this purpose, circu-lar sea.ling rings 60 and 62 are provided to insure a smooth, leak-free, slidable seal between flanges 57 and 58 and the respec- .
tive bearing surfa.ces thereunder.
The main body 64 of collar is a radially enlarged, inwardly extending, annular portion circumscribing surface 52 of boss portion 36 and is provided with opposed, axially project-ing, integral flanges 57 and 58 which enga.ge the underlying 30 second annular portion 44 and collar 48 respectively. The inner ~. .
surface of main body 64 is slidable along the length of surfa.ce 52 and a fluid-tight seal is provided therebetween by means of : ,, 10458~:1 0-ring 66 seated within an annular recess provided there~or in surface 52.
A pair of oppositely directed, generally L-shaped pneu-matic line apertures 68 and 70 having outer radially proJecting threaded portions are further provided in main body 64 and are adapted to receive threaded fittings 72 serving to connect sepa-rate pneumatic hoses 74 and 76 to collar 56. The apertures 68 and 70 include transverse air delivery passages 78 and 80 respec-tively which extend to space 46 cooperatively defined by collar 48 and enlarged second annular portion 44 of boss 36. As best shown in Figures 4 and 5, the L-shaped apertures 68 and 70 have transverse legs which are oppositely directed. Specifically viewing Figures 4 and 5, slot 78 opens to communicate aperture with the forward wall of collar 48, while slot 80 communicates aperture 68 with rearmost wall 45 of second annular portion 44.
By virtue of the above-described arrangement, collar 56 may be shifted axially in either a forward or rearward direction i~ by selective application of pnéumatic pressure through hose 74 or 76. Thus, if pressurized air is directed through hose 74, 20 movable collar 56 will be shifted forwardly; conversely, if ~ -pressurized air is directed through hose 76,movable collar 56 in turn will be shifted in a rearward direction.
In order to selectively control the flow of glue from orifices 54, an externally mounted, relatively thin, apertured sleeve member 81 is disposed about head 32. For this purpose, the forward flange 58 of movable collar 56 is provi~ed with a plurality of upraised ridges 84, and sleeve 81 has correspond-ing cut-away slots which are adapted to register with ridges 84 to thereby interconnect movable collar 56 and sleeve 81. Thus, ~`
30 collar 56 and sleeve 81 are adapted to axially reciprocate in ~ -unison in response to selectively directed pneumatic pressure as described above. The slidable connection of sleeve 81 about head .
32 is completed by means of parallel, a.xially extending braces 86 and 88 which are attached to the respective distal ends of metallic sleeve 81 by mea.ns of fasteners 90. Sleeve 81 is held in place about cylindrical head 32 by provision of screws 92 which pass through clearance hole in brace 86 and are threadably secured within the remaining brace 88.
Sleeve 81 also includes an aperture 94 positioned and configured to register with each of the glue-applying orifices 54 of head 32 when sleeve 81 is shifted into its forward opera-tive position. Thus, as described previously, when pressurizedair is applied through hose 74, movable collar 56 and sleeve 81 are shifted in uniso~ in a forward direction to a point where orifices 54 and apertures 94 align. This operational configura- .
tion is depicted in Figure 5, and as can be appreciated, glue from supply 20 is thereby permitted to flow through orifices 54 onto .
web 18.
When it is desired to interrupt glue application, ~-pressurized air is first directed through hose 76 which acts to shift movable collar 56 and sleeve 81 rearwardly. This in turn :;~
causes a misalignment of apertures 94 and glue-applying orifices 54 (see Figs. 3 and 4) to thereby preclude flow of glue from the :
latter. Additionally, in this stop position no significant quan-tity of air is permitted.to contact the glue within the glue-applying orifices 54, and consequently there is no hardening of glue therein. Hence, when it is desired to resume application of glue to web 18, the externally mounted control assembly is simply shifted to its operative positio~ as described, and glue again . - .
begins to flow readily. ~:
Another important feature of the present invention is the manner in which glue is ultimately applied to moving web 18.
As indicated previously, prior glue-applying assemblies ha.ve con- :
ventionally employed pressurized nozzles or the like in order to 1~)458~1 apply glue to moving paper webs. However, by provision of the apparatus described herein, it has been discovered that a novel and unique glue-a.pplying method results. Specifically, moving web 18 acts upon the relatively viscous glue within orifices 50 in a manner simila.r to the phenomenon known as "capillary action".
That is, web 18 acts to "wipe'; or pull glue from orifices 54 in a continuous, speed-related fashion. As depicted in Figure 10, the attraction created by moving web 18 causes a continuous, relatively uniform line or stripe of glue 96 to be laid on web 10 18 a.long the length thereof. Moreover, this action has been .
found to provide glue delivery proportional to web speed, so ~:
that the apparatus of the present invention is capable of auto- .~ -matically varying the rate o~ glue application to compensate for changing web speeds. Thus, there is no need for complex and ex- - -: pensive equipment which has characterized the glue-applying de-vices of the prior art, because the action of moving web 18 serves :
to automatically adjust the glue-applying capacity of the device. ~ :
. The nature of hea.d 32 a.nd use of gravity glue feed also serves to facilitate adaustment of the amount of glue deposited at any given web speed. Again referring to Figure 10, it is seen that aperture 94 of sleeve 81 is positioned slightly ahead :~
of the point of tangency between web 18 and head 32. In this manner, a. greater quantity of glue is continually applied to web 18 than would occur if aperture 94 were closer to the exact point of tangency. Therefore, it is only necessary to rotate head 32 to various glue-applying dispositions in order to in-crease or decrease the amount of glue continuously applied to moving web 18.
In keeping with the aforementioned properties of the present assembly, it should be noted that a wide variety of glues can be employed in conàunction therewith. The Dnly.~,requirement is that the glue be sufficiently viscous to preclude undue ~.
~V4S811 dripping or flow thereof from the orifices 54 and overlying apertures 94. While almost all commercially available glues m~et this simple criterion, the following resin or dextrin based glues produced by the Swi~t Chemical Company have been found to be particularly advantageous: Nos. 5038; 1338; 1331; 1402; and 2802.
It is also possible to employ a number of specific web arrangements for applying glue thereto from the assembly of this invention. Referring to Figs. 7-9, three additional methods of this type are depicted. For example in Fig. 7, the glue head assembly 24 described in detail above is employed with a moving web 18 in a lightly touching tangential relationship thereto.
For added stability, an overhead leaf-spring member 98 is utilized in order to prevent web 18 from moving out of contact from web 32. This serves to insure more uniform glue application during all operational speeds of the paper handling apparatus. In this connection, it should also be noted that a jet of air could be employed in place of leaf spring 98 with the air being directed to impinge upon web 18 on the side thereof remote from head 32 for the purposes noted.
In yet another method of application, web 18 is wound about a portion of circular head 32 with orifices 5~ and asso-ciated apertures 94 positioned at a point along the length of contact between web 18 and head 32. This embodlment is detailed in Figure 9, and as above, it is possible to vary the quantities of glue deposited on web 18 by simply rotating head 32 to effect ~ -a desired orientation between glue-applying orifices 50 and the web Finally, a separate roller 100 (which can either be driven or free to rotate) can be employed to insure that web 18 remains in glue-applying disposition to head 32 at all times.
This particular embodiment is shown in Figure 8, and similarly ~0458~1 the described wiping or pulling action of the web upon the glue delivered from the glue-applying orifices results in uniform, relatively distortion-free application of glue.
It is thus apparent that the present invention pro-vides a simple, e~fective glue applicator assembly for use in multiple web-fed paper handling devices. Moreover, the assembly -of this invention is cha.racterized by excellent flow control and uniform glue disposition, and is capa.ble of quick and simple $tart-up and adjustment during operation without the problems ~-:
encountered in the constructions of the prior art. ~.
- . , ,, ' ~ "-- ~ . : : .
__PAPER HANDLING APPARATUS
BACKGROUND
This invention relates to a glue applying assembly which is especially adapted for use with multiple web-fed paper handling devices such as collators or the like in order to attach moving, superimposed paper webs in a continuous fashion. How-ever, the structure has utility in connection with various types of machines where there is a need to apply a relatively narrow, continuous line of glue to a moving strip or sheet of material.
More particularly, the invention is concerned with a precisely controllable, nonpressurized assembly wherein gravity actuated glue feed is employed yet the assembly is capable of automati-cally compensating for varying web speeds to maintain uniform glue application during all operational modes.
Glue applicator assemblies for use with web collators have heretofore generally been of the pressurized variety where-in glue under mechanical pressure is forced through a nozzle or -orifice onto a moving web of paper or other material. These devices utilized pressurizing means such as positive displace-ment pumps i~ith an attempt being made to correlate the pump speed with the rate of web travel to provide compensation for changing web speeds. Additionally, these units were normally pro-vided with glue feeder lines of relatively small diameter extend-ing from a central supply to insure that adequate fluid pressure was maintained at all times throughout the system.
In practice it was found that these prior glue appli-cator assemblies involved important constructional and operational deficiencies primarily attributable to the inherent limitations imposed on the system by internal pressurization of glue apply-ing head. First of all, for reasons of the economy of construc-~b` .
-1- q~
(Dkt. #15180) -.
~0458~1 tion and ease of maintenance, these units were generally pro-vided with a plurality of pressurization pumps which were incor-porated into a single area in the overall collator, which re-sulted in relatively long feeder lines leading to the gluing stations thereof.
Hence, by virtue of this construction, the overall glue applicator assembly incorporated into the collator was costly, unduly complex and prone to failure.
Another related problem stemmed from the fact that there was no way to effectively control glue ~low with a de-sirable degree of precision. Specifically, when such pressurized units were shutdown, back pressure created by the long, rela-tively small diameter feeder lines and glue application nozzles tended to cause "bleeding" at the end of the lines adjacent the paper webs. As can be appreciated, such an undesirable feature caused dripping or other leakage of glue onto proximal machinery or flooring, thus creating a considerable problem requiring fre-quent clean-up and maintenance.
Still further problems occurred when it was attempted to commence gluing operation with these prior units, or when ad-justment of glue flow therefrom was found necessary in order to compensate for varying web speeds. In particular, an undesirable lag in glue flow often occurred upon start-up, because it was necessary for adequate pressure to buildup within the system be-fore glue began to uniformly flow from the orifices or nozzles thereof. Similarly, precise adjustment of glue flow during opera- -tion was extremely difficult to achieve because of the necessity .. . . .
of changing the pressure throughout the glue applying system be-fore modification of glue flow resulted.
Therefore, there has been a need in the art for a low-cost, non-pressurized glue applicator assembly for use in web-fed paper handling devices that is capable of effectively '" ' .', ' -- .. - ~ .' ' - ' :,' . :, , ' - ' ' ~045811 and precisely controlling glue flow under varying web speeds and all other optional operational modes of the device.
According the the present invention, an applicator is provided which is adapted to be interconnected to a .
supply of fluid substance for applying a strip of the latter to a m~ving web, said applicator comprising: an elongated .
applicator head adapted to be positioned proximal to said web and having a forward fluid substance applying section adjacent said web and a rearward section presenting a bearing surface, said forward section including a hollow chamber defined in part by a wall having an orifice there-through of relatively small diameter for the application of said fluid substance; slidable means positioned on said bearing surface and axially shiftable therealong; relatively thin, apertured means in covering disposition to.said fluid substance applying section and axially shiftable between a first operative position wherein said aperture is registered with said orifice, and a second flow-preventing position where said orifice is covered to preclude fluid flow : 20 therefrom; means coupling said apertured means and slidable means for axial movement thereof in unison, said coupling means precluding significant rotational movement of the .
apertured means relative to said forward section; and means for selectively shifting said slidable means, including: first fluid pressure means couplea to said slidable means for axially shifting said apertured means to said first position when fluid pressure is applied thereto; and second fluid pressure means coupled to said slidable means for axially shifting said apertured means to said second position when fluid pressure is applied thereto.
` ,-~, 1 _ _, j , . .
Preferably, an elongated tubular delivery member is mount~d on said applicator and in communication with said hollow chamber, said tubular delivery member being adapted for connection to a supply of fluid substance and of dimensions permitting gravity induced fluid flow from said supply to said chamber.
The aperture means comprises an apertured sleeve substantially surrounding the forward section.
In a further preferred embodiment, the first and second fluid pressure actuatable me~ans are pneumatically operated.
In the Drawings: -Figure 1 is a fragmentary, front elevational view ofa gluing station in web-fed paper handling apparatus embodying a glue-applying assembly in accordance with the present invention;
Figure 2 is a fragmentary, side elevational view of the apparatus shown in Figure l;
Figure 3 is a fragmentary, side elevational view of ~0 the applicator head and associated glue flow control assembly, showing the cylindrical flow control sleeve disposed about the applicator head in flow preventing disposition;
Figure 4 is a fragmentary view in partial vertical section of the applicator head as shown in Figure 3 with glue supply line means being illustrated in communication with the control assembly;
Figure 5 i9 a fragmentary view in partial vertical section of the applicator head shown in Figure 4 with the flow control sleeve being illustrated in the shifted position thereof permitting flow of glue from the glue applying .'' ' .
,, ~ ~ ' .
- , . . . . .
.. . .. . ..
orifices of the applicator head; -Figure 6 is an end elevational view of the applicator and associated flow control assembly shown in Figures 3-5;
Figure 7 (on the shee.t of Figure 1) is an end elevational view of a moving web of paper with a glue applicator head of the present invention in tangential, glue applying relationship thereto, with a leaf spring component being provided to maintain the desired relative relationship of the web and applicator head;
Figure 8 is an end elevational view of a glue applicator head in association with a moving web, a roiler being illustrated in this instance to maintain the web in tangential relationship to the applicator;
Figure 9 (on the sheet of Figure 1) is an end elevational view of a moving web and glue applicator head in accordance with the invention, with the web being shown as partially wrapped about the head in order to facilitate glue application thereto; and Figure 10 (on the sheet of Figure 1) is a fragmentary, greatly enlarged view in vertical section of a movable web in conjunction with a glue applicator head, shown with the glue-applying orifices of the latter in proper relation to facilitate glue discharge therefrom by the wiping or pulling action of the moving web.
DETAILED DESCRIPTION
Referring now to the arawings, Figure 1 illustrated a glue-applying station of a multiple web-fed paper collator wherein the overall unit is referred to by the numeral 10. It is to be understood that unit 10 ..
generally consists of a plurality of paper handling ~-:
A
i~4~iB11 and conveying stations which are generally in spaced parallel relationship to facilitate continuous, high-speed handling of elongated webs of paper. However, for - illustrative purposes, only the glue application segment thereof is shown which includes drive and idler rollers 12 and 14 respectively mounted i~ cantilever fashion on upright wall 16. Roller 12 serves to move elongated web 18 through the gluing station depicted in Figure 1 and may be driven at a variable speed to change the forward speed thereof.
Briefly, the glue applicator assembly of the present invention includes an inverted container 20 for receiving a supply : ~ -.
~ , .. .
~ ~
. .
. . -. , : . . . : .
.. . . .. . . . .. .. ..
. - . . : . . . .
~0~8:11 of fluid glue. Container 20 is positioned above web 18 and the remainder of the gluing apparatus for gravitational delivery thereof to the gluing stations. In practice, supply 20 preferably comprises a removable bottle of commercially available glue which is adapted to be positioned upside-down on lateral support 22 with the latter being fixedly secured to upstanding wall 16.
A rotatable glue applica.tor head assembly 24 supported by a hollow tube 30 extending through an aperture in sidewall 16 is held in fixed position relative to wall 16 by locking collar 26 around the support tube on the back side of wa.ll 16.
As shown in Figures 1 a.nd 2, head assembly 24 is in this instance secured in glue-applying disposition such that moving web 18 is in lightly touching, generally tangential relationship thereto.
The overall gluing assembly further includes flexible tubing 28 of relatively large diameter which serves to interconnect supply 20 and head assembly 24 via the hollow support pipe to tube 30 and permit substantia.lly unrestricted fluid flow therebetween.
Referring now to Figures 3-5, glue head assembly 24 is illustrated in specific detail. In general it includes the elongated, metallic, tubular support and glue delivery pipe 30 which communicates with hollow, cylindrical glue-applying head 32 and extends through apertured sidewall 16 as described. A
stretch of flexible tubing 28 is telescoped into pipe 30 at the rearward end thereof and a leakproof seal is provided by com-pressible 0-ring 34 within the outer end of tube 30. Tubing 28 is in turn connected to overhead supply 20 to permit gravity in-duced glue flow therefrom. :
An integral, enlarged, stepped boss portion 36 is pro-vided at the forward end of pipe 30 and includes an annular seat~
ing flange or lip 38 for the purpose of engaging the rearmost edges of the cylindrical sidewall of removable head 32. Addi-tionally, the forward face of boss 36 has a. series of four circu-larly arranged, tapped apertures for the reception of threaded .. . . ..
.. ....
~0 4S~ll bolts 40. These bolts extend through the planar front wall of head 32 and hollow chamber 42 to releasably secure the head to .-boss portion 36.
A second enlarged a.nnula.r portion 44 of b~ss 36 ex-tends rearwardly from flange 38 with the rearmost wall 45 of portion 44 serving to define i~ part a.n annular space or groove 46. An enlarged structura.lly distinct collar 48 is fixedly secured about pipe 30 rearwardly of second annular portion 44 in spa.ced rela.tionship~therefrom. Collar 48 is held in fixed position on pipe 30 by means of a circular metallic clip 50 thereon engaging the outer face of the collar and is provided with an annular groove in the inner surface of the same for re-ceiving an O-ring seal 51 abutting the rearmost upstanding face of stepped boss 36.
As can be seen, collar 48 and second annula.r portion 44 coopera.tively serve to define an annular recessed space or . groove 46. The la.tter is bounded internally by a smooth, metallic bearing surface 52 which also forms a part of the axial sidewall ; of boss 36.
Head 32 is further provided with a desired number of glue-applying orifices 54 which extend through the cylindrical sidewall thereof in communication with interna.l glue chamber 42.
In this regard, it should be noted that any number of orifices .
54 can be provided depending only on the number of stripes of glue which need to be deposited on a given web 18. As can readily ;
be understood from a study of Figures 4-5, glue from supply 20 flows under the influence of gravity through tubing 28 and pipe . .
30 and into glue chamber 42 of head 32. Finally, glue flows out orifices 54 of relatively small diameter during glue-applying 30 procedures.
It is to be understood that although the assembly dis- ..
closed herein can be pressurized if desired, in preferred forms - .:
,. ;
. .. .
.
~045811 of the invention, no pressurization thereof is needed. This re-sults from the use of flexible tubing 28, delivery pipe 30, and chamber 42 of dimensions such that glue flows to head 32 in a substa.ntially unrestricted gravity induced manner. Thus, when supply 20 is positioned above overall glue head assembly 24, adequate amounts of flue are continually fed into chamber 42 without the need of system pressurization. Moreover, because orifices 54 are of relatively small diameter, the only resistance to flow of glue throughout the entire system occurs at these points. Hence, glue flowing from supply 20 through the entire apparatus is prevented from freely flowing only at the point of ultimate application thereof to web 18. In order to lessen this resistance and facilitate glue application, the internal sidewall of head 32 proximal to the orifices 54 is internally milled as at 55 to reduce the length of the orifices and conse-quently the restriction imposed upon glue flow.
An externally mounted, movable, annular collar member - -. 56 is axially shiftable on the rearward portion of head 32 in annular groove 46. Collar 56 has a main body 64 and integral, .
20 opposed, annular bearing flanges 57 and 58 which a.re adapted to slidably enga.ge the outer cylindrical surfaces of collar 48 and ~ .
second annular portion 44 respectively. For this purpose, circu-lar sea.ling rings 60 and 62 are provided to insure a smooth, leak-free, slidable seal between flanges 57 and 58 and the respec- .
tive bearing surfa.ces thereunder.
The main body 64 of collar is a radially enlarged, inwardly extending, annular portion circumscribing surface 52 of boss portion 36 and is provided with opposed, axially project-ing, integral flanges 57 and 58 which enga.ge the underlying 30 second annular portion 44 and collar 48 respectively. The inner ~. .
surface of main body 64 is slidable along the length of surfa.ce 52 and a fluid-tight seal is provided therebetween by means of : ,, 10458~:1 0-ring 66 seated within an annular recess provided there~or in surface 52.
A pair of oppositely directed, generally L-shaped pneu-matic line apertures 68 and 70 having outer radially proJecting threaded portions are further provided in main body 64 and are adapted to receive threaded fittings 72 serving to connect sepa-rate pneumatic hoses 74 and 76 to collar 56. The apertures 68 and 70 include transverse air delivery passages 78 and 80 respec-tively which extend to space 46 cooperatively defined by collar 48 and enlarged second annular portion 44 of boss 36. As best shown in Figures 4 and 5, the L-shaped apertures 68 and 70 have transverse legs which are oppositely directed. Specifically viewing Figures 4 and 5, slot 78 opens to communicate aperture with the forward wall of collar 48, while slot 80 communicates aperture 68 with rearmost wall 45 of second annular portion 44.
By virtue of the above-described arrangement, collar 56 may be shifted axially in either a forward or rearward direction i~ by selective application of pnéumatic pressure through hose 74 or 76. Thus, if pressurized air is directed through hose 74, 20 movable collar 56 will be shifted forwardly; conversely, if ~ -pressurized air is directed through hose 76,movable collar 56 in turn will be shifted in a rearward direction.
In order to selectively control the flow of glue from orifices 54, an externally mounted, relatively thin, apertured sleeve member 81 is disposed about head 32. For this purpose, the forward flange 58 of movable collar 56 is provi~ed with a plurality of upraised ridges 84, and sleeve 81 has correspond-ing cut-away slots which are adapted to register with ridges 84 to thereby interconnect movable collar 56 and sleeve 81. Thus, ~`
30 collar 56 and sleeve 81 are adapted to axially reciprocate in ~ -unison in response to selectively directed pneumatic pressure as described above. The slidable connection of sleeve 81 about head .
32 is completed by means of parallel, a.xially extending braces 86 and 88 which are attached to the respective distal ends of metallic sleeve 81 by mea.ns of fasteners 90. Sleeve 81 is held in place about cylindrical head 32 by provision of screws 92 which pass through clearance hole in brace 86 and are threadably secured within the remaining brace 88.
Sleeve 81 also includes an aperture 94 positioned and configured to register with each of the glue-applying orifices 54 of head 32 when sleeve 81 is shifted into its forward opera-tive position. Thus, as described previously, when pressurizedair is applied through hose 74, movable collar 56 and sleeve 81 are shifted in uniso~ in a forward direction to a point where orifices 54 and apertures 94 align. This operational configura- .
tion is depicted in Figure 5, and as can be appreciated, glue from supply 20 is thereby permitted to flow through orifices 54 onto .
web 18.
When it is desired to interrupt glue application, ~-pressurized air is first directed through hose 76 which acts to shift movable collar 56 and sleeve 81 rearwardly. This in turn :;~
causes a misalignment of apertures 94 and glue-applying orifices 54 (see Figs. 3 and 4) to thereby preclude flow of glue from the :
latter. Additionally, in this stop position no significant quan-tity of air is permitted.to contact the glue within the glue-applying orifices 54, and consequently there is no hardening of glue therein. Hence, when it is desired to resume application of glue to web 18, the externally mounted control assembly is simply shifted to its operative positio~ as described, and glue again . - .
begins to flow readily. ~:
Another important feature of the present invention is the manner in which glue is ultimately applied to moving web 18.
As indicated previously, prior glue-applying assemblies ha.ve con- :
ventionally employed pressurized nozzles or the like in order to 1~)458~1 apply glue to moving paper webs. However, by provision of the apparatus described herein, it has been discovered that a novel and unique glue-a.pplying method results. Specifically, moving web 18 acts upon the relatively viscous glue within orifices 50 in a manner simila.r to the phenomenon known as "capillary action".
That is, web 18 acts to "wipe'; or pull glue from orifices 54 in a continuous, speed-related fashion. As depicted in Figure 10, the attraction created by moving web 18 causes a continuous, relatively uniform line or stripe of glue 96 to be laid on web 10 18 a.long the length thereof. Moreover, this action has been .
found to provide glue delivery proportional to web speed, so ~:
that the apparatus of the present invention is capable of auto- .~ -matically varying the rate o~ glue application to compensate for changing web speeds. Thus, there is no need for complex and ex- - -: pensive equipment which has characterized the glue-applying de-vices of the prior art, because the action of moving web 18 serves :
to automatically adjust the glue-applying capacity of the device. ~ :
. The nature of hea.d 32 a.nd use of gravity glue feed also serves to facilitate adaustment of the amount of glue deposited at any given web speed. Again referring to Figure 10, it is seen that aperture 94 of sleeve 81 is positioned slightly ahead :~
of the point of tangency between web 18 and head 32. In this manner, a. greater quantity of glue is continually applied to web 18 than would occur if aperture 94 were closer to the exact point of tangency. Therefore, it is only necessary to rotate head 32 to various glue-applying dispositions in order to in-crease or decrease the amount of glue continuously applied to moving web 18.
In keeping with the aforementioned properties of the present assembly, it should be noted that a wide variety of glues can be employed in conàunction therewith. The Dnly.~,requirement is that the glue be sufficiently viscous to preclude undue ~.
~V4S811 dripping or flow thereof from the orifices 54 and overlying apertures 94. While almost all commercially available glues m~et this simple criterion, the following resin or dextrin based glues produced by the Swi~t Chemical Company have been found to be particularly advantageous: Nos. 5038; 1338; 1331; 1402; and 2802.
It is also possible to employ a number of specific web arrangements for applying glue thereto from the assembly of this invention. Referring to Figs. 7-9, three additional methods of this type are depicted. For example in Fig. 7, the glue head assembly 24 described in detail above is employed with a moving web 18 in a lightly touching tangential relationship thereto.
For added stability, an overhead leaf-spring member 98 is utilized in order to prevent web 18 from moving out of contact from web 32. This serves to insure more uniform glue application during all operational speeds of the paper handling apparatus. In this connection, it should also be noted that a jet of air could be employed in place of leaf spring 98 with the air being directed to impinge upon web 18 on the side thereof remote from head 32 for the purposes noted.
In yet another method of application, web 18 is wound about a portion of circular head 32 with orifices 5~ and asso-ciated apertures 94 positioned at a point along the length of contact between web 18 and head 32. This embodlment is detailed in Figure 9, and as above, it is possible to vary the quantities of glue deposited on web 18 by simply rotating head 32 to effect ~ -a desired orientation between glue-applying orifices 50 and the web Finally, a separate roller 100 (which can either be driven or free to rotate) can be employed to insure that web 18 remains in glue-applying disposition to head 32 at all times.
This particular embodiment is shown in Figure 8, and similarly ~0458~1 the described wiping or pulling action of the web upon the glue delivered from the glue-applying orifices results in uniform, relatively distortion-free application of glue.
It is thus apparent that the present invention pro-vides a simple, e~fective glue applicator assembly for use in multiple web-fed paper handling devices. Moreover, the assembly -of this invention is cha.racterized by excellent flow control and uniform glue disposition, and is capa.ble of quick and simple $tart-up and adjustment during operation without the problems ~-:
encountered in the constructions of the prior art. ~.
- . , ,, ' ~ "-- ~ . : : .
Claims (5)
1. An applicator adapted to be interconnected to a supply of fluid substance for applying a strip of the latter to a moving web, said applicator comprising: an elongated applicator head adapted to be positioned proximal to said web and having a for-ward fluid substance applying section adjacent said web and a rear-ward section presenting a bearing surface, said forward section in-cluding a hollow chamber defined in part by a wall having an orifice therethrough of relatively small diameter for the application of said fluid substance; slidable means positioned on said bearing sur-face and axially shiftable therealong; relatively thin, apertured means in covering disposition to said fluid substance applying section and axially shiftable between a first operative position wherein said aperture is registered with said orifice, and a second flow-preventing position where said orifice is covered to preclude fluid flow there-from; means coupling said apertured means and slidable means for axial movement thereof in unison, said coupling means precluding signifi-cant rotational movement of the apertured means relative to said for-ward section; and means for selectively shifting said slidable means, including: first fluid pressure means coupled to said slidable means for axially shifting said apertured means to said first position when fluid pressure is applied thereto; and second fluid pressure means coupled to said slidable means for axially shifting said apertured means to said second position when fluid pressure is applied thereto.
2. The applicator as set forth in claim 1 wherein an elongated tubular delivery member is mounted on said applicator and in communication with said hollow chamber, said tubular delivery member being adapted for connection to a supply of fluid substance and of dimensions permitting gravity induced fluid flow from said supply to said chamber.
3. The applicator as set forth in claim 2 wherein said tubular member is configured to permit axially rotatable mounting of said applicator on complemental mounting structure ad-jacent said web.
4. The applicator as set forth in claim 1 wherein said apertured means comprises an apertured sleeve substantially surrounding said forward section.
5. The applicator as set forth in claim 1 wherein said first and second fluid pressure actuatable means are pneumatically operated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US395136A US3871280A (en) | 1973-09-07 | 1973-09-07 | Glue applying assembly for multiple web-fed paper handling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045811A true CA1045811A (en) | 1979-01-09 |
Family
ID=23561845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA205,321A Expired CA1045811A (en) | 1973-09-07 | 1974-07-22 | Glue applying assembly for multiple web-fed paper handling apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3871280A (en) |
| CA (1) | CA1045811A (en) |
| DE (1) | DE2442478A1 (en) |
| FR (1) | FR2243136B3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110465436B (en) * | 2019-09-09 | 2024-06-14 | 深圳市鹏创达自动化有限公司 | Dispensing equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2251264A (en) * | 1938-08-09 | 1941-08-05 | Samuel H Berch | Means of coating material |
| US2765769A (en) * | 1952-05-01 | 1956-10-09 | Schroeder Machines Corp | Adhesive applicator |
| US2833242A (en) * | 1954-10-18 | 1958-05-06 | Burroughs Corp | Nozzle for striping web materials |
| US3277868A (en) * | 1963-02-18 | 1966-10-11 | Lockwood Tech | Adhesive applicator including adhesiverecirculation means |
| US3298353A (en) * | 1963-09-03 | 1967-01-17 | Hamilton Tool Co | Multiple orifice glue applicator |
| US3476631A (en) * | 1963-11-18 | 1969-11-04 | Hamilton Tool Co | Method of and means for distributing glue to a moving web |
-
1973
- 1973-09-07 US US395136A patent/US3871280A/en not_active Expired - Lifetime
-
1974
- 1974-07-22 CA CA205,321A patent/CA1045811A/en not_active Expired
- 1974-08-21 FR FR7428695A patent/FR2243136B3/fr not_active Expired
- 1974-09-05 DE DE2442478A patent/DE2442478A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US3871280A (en) | 1975-03-18 |
| FR2243136B3 (en) | 1977-06-10 |
| DE2442478A1 (en) | 1975-03-13 |
| FR2243136A1 (en) | 1975-04-04 |
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