US 3272673 A
Description (OCR text may contain errors)
Sept. 13, 1966 HENINZ*HERMANN FOCKE 3,272,673
METHOD OF AND DEVICE FOR PROVIDING WRAPPING MATERIAL WITH A PULL STRIP Filed May 14, 1963 2 Sheets-Sheet 1 Sept. 13, 1966 HENlNZ-HERMANN FOCKE 3,272,673
METHOD OF AND DEVICE FOR PROVIDING WRAPPING MATERIAL WITH A PULL STRIP Filed May 14, 1963 zsw' W29 1 30m) 7 12 8/ 31 1.2
g 2 1a L 2 Sheets-Sheet 2 United States Patent many Filed May 14, 1963, Ser. No. 280,359 3 Claims. (Cl. 156-269) The present invention relates to a method of and device for placing a strip of material, for instance a pull strip, upon longitudinally moving Webs of wrapping material.
Heretofore such webs of wrapping material and the pull strips were withdrawn from separate supply spools and were then moved together and connected to each other by gluing or sealing, and finally were cut to length. Arrangements for handling one web or a plurality of Webs are known. However, they have the drawback that with a structure for single webs two supply spools are required whereas with a structure for two webs four supply spools are required.
According to another heretofore known arrangement for a one-web wrapping machine, the web of wrapping material and the pull strip are withdrawn from a single supply spool while from the marginal portion of the said web a relatively narrow strip is cut off which, over deviating rollers, is passed to a device for sealing, dyeing or gluing and is then deposited on a desired portion of the web where it is glued or sealed thereto. A drawback of this arrangement consists in that the supply spool is difiicult to control in such a way that no lateral movement whatsoever will be imparted upon the web, while on the other hand already small lateral movements of the supply spool greatly vary the width of the pull tape.
It is, therefore, an object of the present invention to provide a method of and device for cutting webs of wrapping material .and pull tapes, which will overcome the above mentioned drawbacks.
It is another object of this invention, from a single web of material, to cut oif both the wrapping material and the pull tape while preventing any material variations in the width of the pull tape.
These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:
FIG. 1 diagrammatically illustrates an arrangement according to the present invention.
FIG. 2 is a top view of the arrangement of FIG. 1 as seen along the line IIII of FIG. 1, said top view showing the cutting means for cutting the pull tape.
FIG. 3 is a front view of the arrangement of FIG. 1 as seen in the direction of the arrow A of FIG. 1.
FIG. 4 is a top view of the guiding roller for the cut webs and the cut pull strips, FIG. 4 being seen along the line IV-IV of FIG. 1.
FIG. 5 is a top view of the web with U-shaped cuts.
FIG. 6 illustrates a view of the guiding roller and cutting-off device as seen in the direction of the arrow B of FIG. 1.
FIG. 7 shows the two pieces of wrapping material with pull strips in finished condition.
FIG. 8 is a top view of a knife used in connection with the present invention.
The present invention is characterized primarily in that from a single web of material at the same time two parallel webs of wrapping material and two pull strips are cut whereby simultaneously two packets may be wrapped in a continuous process and be provided with pull strips. As wrapping material there may be used any convenient material as for instance material of polymethane acrylic 3,272,673 Patented Sept. 13, 1966 acid ester also known under the trade mark Cellophane, material of polyvinyl chloride or any other wrapping material.
In conformity with the present invention, the webs of wrapping material with the pull strips to be cut for two packets are withdrawn from a single supply spool the width of which is so dimensioned that it corresponds to the total of the width of the two webs of wrapping material and the pull strips to be made. The strips to be produced are obtained by three cuts in longitudinal direction of the Web and, more specifically, two webs of relatively wide wrapping material and two relatively narrow strips for the pull tapes are obtained.
Referring now more specifically to the drawings, the arrangement diagrammatically illustrated in FIG. 1 comprises a supply spool 10 with wrapping material 11 thereon the Width of which corresponds to the total of the desired width of the two webs of wrapping material 12, 12' to be produced and of the two pull strips 13, 13'. The web of material 11 passes over rollers 14, 15 and by means of three knives 16, 16a, 16b laterally spaced from each other in conformity with the width of the strips to be cut is cut in such a way that two relatively narrow strips 13, 13' of a width of from 2 to 4 millimeters are produced and in addition thereto two relatively wide webs 12, 12'. The narrow strips 13, 13' are passed over deviating rollers 17, 18 to a device 20 where a dye and/or adhesive solution is applied to said strips. The thus treated narrow strips 13, 13' form the pull strips and are passed over roller pairs 19, 21. The other two wide webs 12, 12 obtained by the cut of knives 16 correspond to the width of the required wrapping material and are passed over rollers 15, 22, 23, 24.
The relatively wide webs 12, 12' and the pull strips 13, 13' are then together fed into the bite of the rollers 21, 24. As will be evident from FIG. 4, the pull strips 13, 13 on rollers 19 are, of course, so controlled that they will be deposited on the two webs 12, 12' at the desired places. To this end, the rollers 19 are adjustable in a manner known per se.
The two wide webs 12, 12' with the pull strips 13, 13 thereon pass over roller 24 to a sealing or drying device 25 and over a roller 26 and a compensating or tensionin g roller 27 to a roller 28. The roller 28 cooperates with a roller 30 equipped with cutting means 29 by means of which a U-shaped incision 31 is produced as shown in FIG. 5. The dot-dash lines 32 indicate a cut to be effected subsequently by scissor-like knives 33 which are arranged behind roller pairs 34, 35.
The rollers 22, 23, 24 are pulling rollers and rotate continuously. They may be driven in any convenient manner. The roller pairs 28, 30 and 34, 35 on the other hand are driven intermittently. During the intermittent standstill of the rollers 34, 35, the knives 33 cut off the respective desired length of the wrapping material.
The compensating roller 27 is a tensioning roller for the strips 12, 12. To this end, roller 27 is journalled on an oscillatable lever 27a to the upper end 27b of which there is connected a spring 270. Spring 27c continuously urges the lever 27a to turn in clockwise direction with regard to FIG. 1, thereby holding the strips 12, 12' under tension.
The knives 33 are each provided with two recesses 33a corresponding to the location of the tabs produced by the incision 31 so that when cutting off the desired length of wrapping material, the tabs will not be cut off. The finished product is shown in FIG. 7.
It is, of course, to be understood that the present invention is, by no means, limited to the particular arrangement and designs shown in the drawings but also comprises any modification within the scope of the appended claims.
What I claim is:
1. A method of continuously and simultaneously providing two similar, composite Webs of wrapping material, each of which comprises a relatively wide strip and a relatively narrow tear strip superimposed on said relatively wide strip, which includes the steps of: feeding a web of material longitudinally, simultaneously cutting said web along the center line and along two lines parallel to said center line and equally spaced on opposite sides of said center line and substantially closer to said center line than to the outer edges of said web so as to form two narrow tear strips of equal width along the sides of the center line and two substantially wider wrappings strips between said narrow strips and said outer edges, and guiding each relatively narrow strip into superimposed relationship with One of the relatively wide strips.
2. A method as claimed in claim 1, and applying an adhesive to the side of each of said narrow strips that engages the corresponding wide strip before said strips are superimposed.
3. An apparatus for continuously and simultaneously providing two similar, composite webs of wrapping material, each of which comprises a relatively wide strip and a relatively narrow tear strip superimposed on said relatively wide strip, including: means for feeding a web longitudinally, cutting means in the center line of the path of said web to slit said web in the center and two cutting means equally spaced from said center line on opposite sides of said first cutting means to slit said web simultaneously on opposite sides of said center line, said two cutting means being substantially closer to said center line than to the outer edges of said web so as to form two narrow tear strips of equal width along the sides of said center line and two substantially -wider wrapping strips between said narrow strips and said outer edges, and means for guiding each relatively narrow strip into superimposed relationship with one of the relatively wide strips.
References Cited by the Examiner FOREIGN PATENTS 222,637 7/1959 Australia.
EARL M. BERGERT, Primary Examiner.
D. J. DRUMMOND, Examiner.