US 2661582 A
Description (OCR text may contain errors)
Dec. 8, 1953 w. F. HANSER 2,561,582
TEAR-CORD APPLYING MACHINE AND METHOD Filed Dec. 15, 1951 2 Sheets-Sheet l ATTORNEYS.
Dec. 8, 1953 w. F. HANSER 7 2,661,532
TEAR-CORD APPLYING MACHINE AND METHOD Filed Dec. 15, 1951 2 Sheets-Sheet 2 ATTORNEYS.
Patented Dec. 8, 1953 UNITED i r ifi 'hld'l FFICE FEAR-CURB APELYING MACHINE AND METHDB Application December 15, 1951, Serial No. 261,87 9
This invention relates to a tear-cord applying machine and method. The invention is particularly useful in the application of cord or other tear means to a package, whereby upon the drawing of the cord the package may be readily opened.
In the application of a tear filament to a package where the filament is secured by adhesive, great diiiiculty is encountered in the feeding of such a filament properly within the machine at the precise location needed because of the light or fragile character of the filament and because the use of adhesive often attaches the filament to parts of the machine, etc, causing stoppage and loss of time or a nus-feeding of the filament to the package. Further, difiiculties are encountered in attempts to pass packages rapidly through the machine while effecting automatically a severing of the filament at predetermined intervals and without causing misalignment of the unsevered portion of the filament as it approaches the next container. A need has long existed for a rapid and accurate machine and method of the application of tearcord or filaments to containers.
An object of the present invention is to provide a method and machine for overcoming the difficulties described above and for insuring the rapid and accurate application of the draw elements to the package. Another object is to provide a method and means whereby the draw member is applied at relatively little or no increased expense during the actual wrapping operation which is already necessary in the forming of the completed package. Yet another object is to provide means for applying a tear-cord to a container adjacent the cover of the container, whereby upon the drawing of the cord, a sharp, uniform severance of the wrapper is effected without producing jagged lines therein and without disfiguring the wrapper. A still fur ther object is to provide a process and apparatus whereby a container, after being glued along its body portion, is rotated to draw the tear-cord there-about while at the same time affixing a wrapper to the package and about the cord while also providing means for severing the cord at a point beyond the wrapper. A still further object is to provide in a wrapping machine for a container, means for feeding a draw-cord accurately to the container and maintaining the cord in a predetermined position for accurate engagement with the container as the same is rotated in the wrapper-engaging and in the wrapping operation. Other specific objects and advantages will appear as the specification proceeds.
The invention is shown in an illustrative embodiment by the accompanying drawing, in which- Figure l is a broken side View in elevation of apparatus embodying my invention; Fig. 2, a perspective view illustrating an initial step in the cord-applying operation; Fig. 3, a view similar to Fig. 2 but showing the successive ste Fig. 4, a view similar to Fig. 3 but showing the following step in which the wrapper is being picked up by the glued container and covering the tear-cord already attached to the container; Fig. 5, 2. diagrammatic perspective View similar to Figs. 1, 2, and 3, but showing the later step in which the cord is brought within the cutting apparatus; Fig. 6, a view similar to Fig. 5, but showing a continuation of the wrapping step and the bringing of the cord within the cutter for a final severance; Fig. 7, a View similar to Fig. 2, but showing the final step in which the container is completely wrapped with the draw-cord thereunder; Fig. 8, a broken top plan view of the apparatus; Fig. 9, an enlarged sectional detail view showing the container in cord and wrapperengaging osition; Fig. 10, a detail sectional View, the section being taken as indicated at line llllli of Fig. 9; Fig. 11, an enlarged perspective detail view showing the cutter apparatus employed; Fig. 12, a sectional view of the air tube employed for maintaining the draw-cord in a desired direction forengagement with the container; and Fig. 13, a broken detail perspective view of the cord-retarding means employed.
In the practice of the invention herein described, I employ any suitable type of wrapping machine in which a container is partially coated with a glue and a wrapper applied thereto. Il'l' the illustration given, there is shown a wrapperapplying apparatus which is well-known in the art and which need not be described in great detail. As shown more clearly in Figs. 1 and 8, the wrapper apparatus is provided with a base support it on which is mounted parallel tracks ll adapted to receive a container l2 for rotation thereon. Between the tracks H is suspended a magazine support E3 in which container wrappers are supported and fed upwardly. To facilitate the picking up of the wrappers, the tracks I are stepped upwardly at M and I5, and the raising of the tracks also facilitates the bringing of the draw-cord within the cutter elements, as will be later described.
To cause the containers l2 to roll along the tracks ll through the machine, there are provided a pair of continuous belts It mounted on pulleys I1 and I8. The pulleys ll are mounted upon a shaft [9, and the pulleys l8 are mounted upon a shaft 20. The shaft 2!! is provided with a drive pulley 2| connected by belt 22 to a driven pulley 23, driven by motor 24 through belt 25 and pulley 26.
In order to urge the belt I6 against each container I2 as it passes through the machine, rolling on tracks II, I provide a series of rollers 21 mounted on shafts 28, the shafts being carried by slide blocks 29 within the frame guides 30, each block being urged downwardly by a spring 3|, as shown more clearly in Fig. 10. Since such structure is well-known, a detailed description herein is believed unnecessary.
Suitable means for applying the glue to the container is provided in the apparatus. This consists of a glue pot 32, in which is mounted a roller 33 and a transfer roller 34 is provided for rotating in a direction opposite to the rotation of the container l2 for applying glue thereto. In operation, the roller 34 rotates at a high speed for applying glue to the surface of the container withspaeed gaps in the glue applying surfaces, whereby the container has intermediate portions 35 and-36 which'are free of glue and which contactwith the drive belts l6, as shown best in Fig. 10.
The container I2 may be of any suitable type or construction. .In the illustration given, a cylindrical container is provided having a cap or closure lid 3'lat one end and the glue coating extending over the inner portion of the cap so as to cause the wrapper "38, when secured to the container, to thus unite the cap to the body of the container, as shown more clearly in Fig. 7.
In conjunction with the foregoing illustrative apparatus, in which a container is coated with adhesive and provided with a wrapper as it is advanced through the machine, I provide means for supporting a tear-cord, means for retarding the movement .of "the tear-cord, means for supporting the tear-cord inaccurate alignment with thepcontainer which 'is being rolled upon the tracks to cause the cord to be picked up by the glue of the container, and means finally for severing the cord after it has been extended about the container and the cover has been applied. I will now describe such means.
Upon a bracket 39 carried by the frame of the machine, is mounted a spindle carrying a twine cone 40 from which the tear-cord or filament '41 is drawn forwardlyas it isneeded. The'cord 4| passes through the felt strips 42 support'edby the clamp bracket 43, and from thence thecord passes through the lower portion of an air tube 46, as shown more clearly in Fig. 12. The tear-cord extends through an opening 45 in the lower portionof the'tube 4d, and past the inwardly-turned lip l6. An air pipe d1 communicates with tube "44 and leads from a source of compressed 'air (not shown).
A solenoid-operated valve 38 controls the opening and-closing of the conduit '41. A shield "49 of sheet metal or other suitable material is supported-alongside the tube and spaces the tube from the adjacent drive belt 16, as shown best in Fig. 10.
Beyondthe shield-dais a cutter device 50'which may be of any suitable'type. In the illustration 70 given, I provide a solenoid -5l for "operating a plunger 52 secured to the upper end of a bell crank 53 mounted upon a pivot 54 carried by the frame member 55. A cutter 56 is secured to the lower end of the bell crank arm 53,-and is adapted to be moved forward pasta cutting edge 51 supported by the member 58. A spring 59 normally urges the cutter members 56 and 51 in spacedapart relation, as illustrated in Fig. 11.
In order to control the solenoid valve 48. I provide a contact member 60 which, when engaged by a container, causes the valve 48 to close the conduit 47.
Spaced forwardly of the contact 50 is a second contact switch member 61 which, when engaged by a container, closes the circuit of the solenoid 5!, causing'the cutter member 56 to advance and sever the cord 4 I It will beunderstoodthat the switches 60 and '61 may be located-at any desired point and, if desired, located on the same side of the machine with the cutter and the cord-feeding parts. For example, the cord support, tube, shield, cutter, and switches 50 and 6! may all be mounted in a compact manner upon a. bracket structure supported at one side of the machine. I prefer to employ along with the tracks I l,.side frame mem bers 62 which abut the ends of the containers l2 and keep them rolling in a plane transversely of their-axes across the machine.
Operation In the operation of the apparatus and method, a container 12 is fed forwardly upon the tracks I! and the lower portion of. the belt I-B carries the container forwardly alongthe tracks. 'When the container reachesthe glue-applying roller -34, the rapid rotation of the roller '34 in the-opposite direction temporarily halts the advance of ,the container t2 while causing the container to be coated with glue at all points except at the annular spaces 35 and 36 near its ends. After this rief pause, the container is carried forward by the belt it and :meets the cord GI which is held at the desired angle for engagement with the adhesive-coated container, as illustrated in Fig. 2. At the point when the cord is making contact with the container, one end of the container engages the contact 60 and the .valve '48 cutsoff the flow of compressed-airthrough tube-M. The cord, thus released engages the glue-coated side of the container and --is firmly gripped thereby .in a line parallel with the end of the container. As the container is rolled forwardly, the:tear-c'ord M is drawn through the retarder feltsfdzzandis extendedabout the end of the containeradjacent the edge of the cap or closure lid'31. Simultaneously, the-glue wall of thecontainer .l 2:.pi'cks up a wrapper '38 from'the magazine 13 and the wrapper extends about the-container as the containerrotates, asillustrated. more'clearly in Figs. 2 to 7, inclusive. -'As the container advances -further, it engages the switch filxan'd the cutter 50 operates to sever'the cord '41. Since the container haspassed-behind the contact-switch 60, Y
the solenoid valve "48 is urged open-by 'its spring so that compressed airagainfiows through :the tube 44 .and holds :the unsevered end portion of the cord 3! again in a:trueline-'foraccurate en- 1113 common to employ agtransversely ;opfer"ating continuous glue belt -for :applyingmasteor: other 5. adhesive to theoverlapped portion for securing the overlapped edge. Since such structure, however, is old and well-known in the art and is not essential to the practice of the present invention, a detailed description of such structure is herein believed unnecessary.
It will be understood that in actual operation, a series of containers 12 are fed in rapid succession through the machine, each quickly picking up a cord portion and wrapping a label wrapperthere-about, and, after a severing of the cord, being advanced and discharged from the machine. Further, it will be observed that the raised portions E i and E of the track cooperate with the cord cutter in elevating the cord-carrying portionof the container to bring the cord within the cutter elements just prior to the actuation of the switch 6| by contact with the container i 2.
The shield 45 is effective in keeping the string after severance from drifting into contact with machine portions, and the compressed air stream from tube 4 snaps the cord after severance quickly into a true, straight line for accurate engagement with the next container.
While the process herein has been described in connection with the physical apparatus illustrated, it will be understood that entirely different apparatus may be used and, in fact, the
steps may be to a large extent accomplished manually and by the use of a manually-directed air stream, etc.
While I prefer to operate the solenoid valve 48 to close the compressed air line i! just prior to the engagement of the filament with the container, the valve may, if desired, be omitted and the compressed air line used continuously for maintaining the filament accurately in the line required. I have found, however, that when the valve 48 is closed just about the time that the container is engaging the filament or cord, there is a quick pick-up of the cord by the container without loss of accurate alignment of the cord and the operation is thus improved.
While, in the foregoing specification, I have set out specific apparatus and specific method steps in considerable detail for the purpose of illustrating embodiments of the invention, it will be understood that such details may be varied widely by those skilled in the art Without departing from I the spirit of my invention.
1. In wrapping and filament-attaching apparatus, a frame, a track carried thereby for supporting a cylindrical container, means for applying adhesive to the container, means for supporting a wrapper adjacent said track for engagement with said container, a tube communicating with a source of compressed air and having an open end directed for discharging an air stream in front of the container, a filament supported adjacent said tube and having a free end portion engaged by said air stream, and means for rotating said container into engagement with said filament and said wrapper to wrap the filament about the container and the wrapper about the filament and container.
2. In apparatus of the character set forth, in which a cylindrical lid-equipped container is rotated upon a track and in which adhesive is applied to the container, a tube communicating with a source of fluid pressure and having an open end directed to discharge a stream of pressure fluid in front of said container, means for supporting a filament with a free end portion engaged and supported by said stream, and a wrapper supported for engagement with said adhesive-equipped con- 4. The structure of claim 2, in which said tube is provided near its open end with an opening through which said filament is extended into the fiuid stream.
5. In a wrapping and filament-attaching apparatus, a track having raised portions at an intermediate point, means for rolling a container upon said track, whereby when said container reaches said raised portions it is elevated, a filament-supporting member, means for supporting a free end portion of said filament in front of a container, means for applying adhesive to said container, whereby when said container is ro- 'tated, said filament is engaged by said container and drawn forwardly, filament-cutting means supported in an elevated position and engageable with said filament when said container is raised by said track, and means for actuating said severing means for severing the filament when the container is elevated.
6. In apparatus for wrapping a container and attaching a filament about the container, means for applying adhesive to a container, a tube member communicating with a source of compressed air and supported for discharging a stream of air in front of said container a filament supported adjacent the discharge of said tube and adapted to be blown by said air against said adhesivecoated container, means for rotating said container in contact with said filament, and means for applying a wrapper to said container, whereby upon the rotation of said container said wrapper is drawn to enclose said filament and a portion of said container.
7. In apparatus of the character set forth, a track, means for rolling a cylindrical container upon said track, means for applying adhesive to said container, means for supporting a wrapper for engagement with said container to cause said wrapper to be drawn about said adhesive-coated container, means for discharging a restricted stream of air in front of said container at a point prior to the wrapping of the container, and a filament support supporting a filament with a free end portion in said stream whereby said filament end portion is supported in front of said adhesive-coated container for adherence theretowhen said container is rotated.
8. In apparatus of the character set forth, a track, means for rolling a cylindrical container upon said track, means for applying adhesive to said container, means for supporting a wrapper for engagement with said adhesive-coated container to cause said wrapper to adhere thereto and to be drawn about said container, means for I discharging a restricted stream of air in front of 65! said container at a point prior to the wrapping of the container, a filament support supporting a filament with a free end portion in said stream,
whereby said filament end portion is supported in front of said adhesive-coated container for adherence thereto when said container is rotated, an electrically-controlled valve for stopping the flow of said stream of air, and a switch engageable by said container for controlling the actuation of said valve.
9. In apparatus of the character set forth, a
track :al'on'g whichia cylindrical'a'containeriis toibe rolled, imea'ns for'rol'lin*g;said container along said traclgfmean's for aapplying ad-hesive to :said container, means for attaching a wrapper to sa-ida'dhe'si-ve-coated container, a cord support, :a friction device through which said cord extends, and a tube communicating-with a source of compressed air and supported for discharging a stream-of-air in -front 0f sai'd adhesive-coated container, said tube being provided near its open end with an opening through "which said :cord is extended.
10. In apparatus of the character set forth-in which ia -conta'iner-is supported for roiling-upon a traok and coated with adhesive and'a wrapper is 'attached to the-adhesi-ve, means for applying adhesive' to the-"container, a=-tube communicating wit-Ina source of pressure and having its openend directed tor delivering anairstream infront of said-container, endless belts engaging the outer edges of said container for rolling the same, means for supporting a filament in said air stream for contact with said adhesive-coated container, whereby the rolling of the container canses' the filament-to adhere to the container, and a'shield'interposed"between said filament and theadjacent belt,
'11. *I-na process forwrapping a cylindrical container with a tear-filament thereon, in which a containeriscoated withadhesive and rotated,
the steps of directing air-in a "restricted stream 8 tainer to wrap the wrapper :about :the Jfiiamefit and cont ainer.
'12. In amethod for wrapping a container and attaching "a filament about the jcontainer below the wrapper, the steps of-supporting a filament by means of a restricted air stream in front :offa cylindrical container, coating said container vwith adhesive, advancing the container-into engagement with said filament and to engagement-with a wrapper, and rolling the adhesive-coated container into 'contactsuccessively with the filament and'wrapper'to draw thesame ab'cmti ti-ie container.
13. In apparatus of the character set forth,'-a track; means for rolling a cylindrical container along said track, means for applying adhesive to the container, an electric valve-controlled tribe leading froma-source of compressed airand'supported for directing a stream of air in front or the adhesive-coatedcontainer, means 'for supporting a filament adjacent said tube whereby a free end portion of thefilament is carried bysaid stream, means for supporting a wrapper for engagement with said container whereby said wrapper is attached to said container and to said filament as the container is rolled, electrically operated means for severing said filament, and spaced switches engageable by said container as itrdlls upon said track for closing said "air valve *andfor actuating said severing means.
References Cited in the file ofthisi-patent UNITED Y STATES PATENTS Number Name Date 696,218 Whitehurst Mar. 1902 2,056,388 Carlin 'Oct. 6,1936 2,165,289 Milmoe "July-1'1, I939