US2796847A - Valves for glue applicators for carton sealing machines - Google Patents

Description

June 25, 1957 M. M. GUGGENHEIM 2,796,847

VALVES FOR GLUE APPLICATORS FOR CARTON SEALLNG MACHINES Filed June 17, 1955 INVENTOR. I -gm Zag ff? L Fu ...no agwlwx Snsl llll Il United States PatentC VALVES FOR GLUE APPLICATORS FOR CARTON SEALING MACHINES Max M. Guggenheim, New York, N. Y., assignor to National Equipment Corporation, New York, N. Y., a corporation of New York Application `lune 17, 1955, Serial No. 516,239

8 Claims. (Cl. 118-411) This invention relates to an apparatus for sealing cartons, and more particularly to the portion thereof which applies glue or an adhesive to the aps of the carton preparatory to the same being folded down into sealing position.

'Ihe invention has particular reference to a part of the machine shown in the patent to Philip G. Schlemmer, Patent No. 2,691,260, dated October 12, 1954. In that patent the cartons to be sealed are moved along on a support, and one or more projecting flaps of the carton are brought into contact with perforated glue applicator tubes which cause a supply of glue to be placed on the surfaces of the aps to be subsequently folded down. The present invention has reference to a means by which the glue applicator tube may have a selected number of its outlet openings or perforations covered or uncovered as required to thereby accommodate the effective area of glue application to carton aps of various heights.

It is therefore an object of the invention to provide a simplified valve means which can be very easily adjusted to permit the applicator tube to apply glue within a given area only, according to the height of the aps on the cartons to be sealed.

With this and other objects to be hereinafter set forth, in view, I have devised the arrangement of parts to be described and more particularly pointed out in the claims appended hereto.

In the accompanying drawing, wherein an illustrative embodiment of the invention is disclosed,

Fig. 1 is a vertical sectional view through a glue applicator and valve means therefor made in accordance with the invention;

Fig. 2 is a front elevational view of the same, with parts in section to disclose construction;

Fig. 3 is a front elevational view of the tubular valve;

Fig. 4 is a sectional View, taken substantially on the line 4 4 of Fig. 1, looking in the direction of the arrows,

Fig. 5 is a sectional view, taken substantially on the line 5 5 of Fig. 3, looking in the direction of the arrows, and

Fig. 6 is a perspective view of the applicator and a portion of the carton to which adhesive is applied.

Referring to the drawing, 1 indicates an outer applicator tube, provided for a substantial portion of its length with a flat surface 2 through which is formed a line of spaced perforations or holes 3 arranged in a longitudinal row. Glue or another suitable liquid adhesive, passes through these holes and comes into contact with a face of the tiap of a carton which is brought into contact with the tiat surface 2 of the outer applicator tube, as the carton travels through the machine. The outer applicator tube 1 is provided with a closed end 4, and adjacent to its opposite end it is formed with a slot 5. The applicator tube is suitably supported by means such as is shown for example, in the Schlemmer Patent No. 2,691,260.

Mounted for limited rotative movement within the outer tube 1 is an inner tube 7a, which closely but rotative- 2,796,847 Patented June 25, 1957 1y, lits within the outer tube. Near one of its ends the inner tube 7a is provided with a radially-projecting pin 6 that extends through the slot 5 and co-operates therewith in limiting the rotative movement of the inner tube 7a within the outer tube 1. Suitable means, such as is disclosed for example in the Schlemmer Patent No. 2,691,260, is provided for rotatively moving the inner tube 7a within the outer tube 1 in a manner to register the line of openings or perforations 7 provided in the inner tube 7a with the slightly larger perforations 3 provided through the wall of the outer tube 1, or to move the inner tube 7a in a manner to disalign the two sets of perforations.

Secured adjustably within the inner tube 7a is a tubular adjustable valve sleeve 8 which also acts as a glue-supply conduit and which consists of an imperforate tube as shown in Fig. 3, closely, but adjustably fitting the interior of the inner tube 7a. Said valve sleeve 8 is adapted to be longitudinally adjusted through the inner tube 7a to a desired extent to determine the number of perforations 7 in the inner tube 7a that are to be exposed to the interior of the applicator to permit the passage of glue through such perforations. For example, in Fig. 1, one of the perforations 7 is exposed below the lower end of the sleeve valve 8 and hence glue entering into the interior of the applicator through the sleeve 8 will pass through this perforation only, to reach the ap of a carton that contacts with the face 2 of the applicator tube 1. By moving the sleevevalve 8 to the desired extent of insertion into the inner tube 7a or withdrawing the sleeve valve to a desired extent and setting the sleeve valve at such desired position, a greater or lesser number of the perforations 7 will be uncovered for passage of glue through them and the area of glue aplication to a carton ap will be either enlarged or reduced according to the size of the carton flap to be glued.

The sleeve valve 8 is open at its lower end and its opposite end receives the flexible glue-supply pipe 12. The means for adjustably maintaining the sleeve valve 8 in any selected position of insertion into the inner tube 7a,

comprises, fitting 9 which is threadably iitted into the end' of the inner tube'7a and through which the sleeve valve 3 passes. A clamping nut 10, threadable on the fitting 9, forces a packing 11 into gripping contact with the sleeve valve 8 thus maintaining the sleeve valve 8 in any selected position of insertion into the inner tube 7a.

To aid the operator in setting the sleeve valve 8 in the required perforation-blocking position, said valve is provided on itsv outer surface with spaced calibrations or lines 13, and by noting the number of these lines which project above or beyond the fitting 9, the operator will at once know the number of holes 7 that remain uncovered by the sleeve valve 8.

From the foregoing, the operation of the described structure will be apparent. A carton 21 moving along on its support will be brought into contact with the at surface 2 of the applicator tube 1, by suitable guide means not herein shown, but as seen in the said Schlemmer Patent No. 2,691,260. At this time, the inner tube 7a has been turned within the outer tube `1 to align the perforations 3 with the perforations 7 and thus glue will pass through such registered perforations 7 and will be applied to the surface of the flap 20 of the carton. By longitudinal adjustment of the sleeve valve 8 within the inner tube 7a, only those perforations as will be required v according to the height of the carton flap willV be exposed 3 Y From'the apparatus described, it will be seen that a means is provided by which a single applicator maybe used for various sizes of cartons, and by means of the adjustable sleeve valve, control of the distribution ofthe glue willfbe had for each specific sizeofcarton flap. This adjustment is easily obtained by unloosening 'the clamping nut 19, sliding the sleeve valve 8 into or out of the inner tube "7a to the extent required, and then tightening the clamping nut 10 to hold the sleeve valvel 8 in the set position. It will be understood that in a carton-sealing lmachine, a number of these applicators may be used for simultaneous or successive application of glue to the several flaps of the cartons.

Having described a single embodiment of the invention, it is obvious'that'the same is not to be restricted thereto, but is broad enough to cover all structures coming within the scope of the annexed claims.

`WhatI claim is:

l. An adhesiveapplieator for cartonisealing machines comprising, a plurality of concentric tubes, the outermost of said tubes beingfclosed at one end two of said tubes being provided with perforations adapted to be aligned or disaligned by rotative movement of .one of the said two tubes, a third and innermost tube through which adhesive is delivered, said third tube being imperforate and being adapted to be longitudinally adjusted within the other tubes .to thereby determine which of the perforations in the two said tubes shall communicate with the interior of the innermost tube.

2. An adhesive applicator comprising anouter applicator tube closed at the bottom and provided with a line of spaced perforations through which an adhesive passes to reach a carton flap, an inner tube mounted within the outer tube and adapted for limited rotative movement within said outer tube, the inner tube having a line of perforations which are aligned or disaligned with the perforations in the outer tube by rotative movements of said inner tube, a slidable sleeve adjustable longitudinally within the inner tube and adapted to cover a selected number of .the perforations therein according to the longitudinal adjustment of said sleeve, meansA for holding the sleeve in selected position of longitudinal adjustment, and means'for conveying adhesive into the interior of said sleeve.

3. An adhesive applicator comprising an outer, closedend applicator tube, said tube having a flattened face against `which the ap of a carton is adapted Vto contact, an inner tube mountedwithin the outer tube and adapted to have a limited rotative movement therein, the outer tube being provided with a line yof spaced perforations through the tlattened area, the inner tube having a line of similar perforations for alignment or disalignment with those of the outer tube on rotative movement of the inner tube, a third tube within the inner tube adapted for longitudinal adjustment therein to cover selected perforations in .both tubes, and means for maintaining said third tube in selected'positions of longitudinal adjustment.

4. In anadhesive applicator as provided for in claim 3, including means engaged with one end of the inner tube for clampingly engaging the third tube and holding the same in selected positions of insertion into the inner tube.

5. In an adhesive applicator, a pair of conceutricallyarranged perforated tubes, the outer tube thereof being closed at its lower end and comprising an applicator member with which the flapofa carton is adapted to contact to receive a charge of adhesive, one of the tubes being rotative within the :other to align Yor disalign its perforations withthe perforations in the other tube, and a third tube -titted within the innermost of the two tubes and `conveying adhesive thereinto, and means for maintaining the third tube in selectedvpositions of longitudinal adjustment relatively to the other tubes, said third tube being imperforate and selectively covering lperforations in the other tubes according to the extent of its projection within the innermost tube.

6. In an adhesive applicator as provided for in claim 5, wherein the third tube is provided on its surface with lindicating marking to indicateexteriorly of the two tubes the number of perforations that are being covered by it for each extent of insertion into the inner tube. i

7. In an adhesive applicator, an outer tube having a carton-lap contacting surface, a line of holes extending longitudinally of the outer tube within the area defined by the attened surface, the outertube being slotted adjacent to one end, an inner tube fitted within the outer tube, the outer tube being closed at one end, the inner tube having an open end positioned adjacent to the closed end of the outer tube, a pin extending radially from the inner tube and passing through the slot in the outer tube, the inner tube being rotative Within the outer tube to the extent-permitted by the slot, the inner tube having a line of holes adapted to register with the holes in the outer tube by rotative movement of the inner tube to a predetermined position, a glue-delivery tube mounted for slidable adjustment within the inner tube, said Aglue-delivery tube being connected to a sourceof glue supply, said glue-delivery tube acting to cover a selected number of holes in both the inner and outer tubes according to the extent of insertion of said glue-delivery tube into the inner tube, and means con nected .to the inner tube for engaging the glue-delivery tube and holding it at any selected position of setting with respect to the innertube.

8. In a glue-applicator as provided for in claim 7, wherein the glue-delivery tube is provided with spaced cross-marks on'its outer surface, Vand which indicate the number of holes being covered'by it, said cross-marks bev ing exposed on that portion of the glue-delivery tube which is extended out of the said holding means.

References Cited inthe le of this patent UNITED STATES PATENTS 2,691,260 Schlemmer Oct. 12, 1954 2,765,769 Schroeder Oct. 9, 1956 FOREIGN PATENTS 447,219 Great Britain May 14, 1936

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