Molding device for molding an inner end portion of a paper pipe

Information

  • Patent Grant
  • 6773248
  • Patent Number
    6,773,248
  • Date Filed
    Thursday, May 30, 2002
    22 years ago
  • Date Issued
    Tuesday, August 10, 2004
    19 years ago
  • Inventors
  • Examiners
    • Davis; Robert
    • Nguyen; Thu Khanh T.
Abstract
A molding device for molding an inner portion of a paper pipe has a molding head, an annular seat disposed on the molding head, an oil supply tube inserted through the annular seat and inserted in the molding head, a rotating device connected to the oil supply tube, and an oil pipe connected to the rotating device. The molding head has a center hole, a plurality of threaded apertures, an annular guide groove, a plurality of round holes communicating with the annular guide groove, a plurality of expanders, a plurality of expander receiving grooves, and a plurality of shafts. Each expander is inserted in the corresponding expander receiving groove of the molding head. Each shaft which has a recess is inserted through the corresponding round hole of the molding head.
Description




BACKGROUND OF THE INVENTION




The present invention relates to a molding device for molding an inner portion of a paper pipe. More particularly, the present invention relates to a molding device which molds an inner portion of a paper pipe to form an inward incurved end and a chamfer angle.




A paper pipe often has a plurality of laminated layers adhered by adhesives. The paper pipe is cut to a predetermined length. After the paper pipe is cut, a sharp edge will be formed on an end of the paper pipe. When a thread or a tape winds the paper pipe, the sharp edge of the paper pipe will damage the thread or the tape. Therefore, it is necessary to provide a molding device for molding an inner portion of a paper pipe in a weaving industry.




SUMMARY OF THE INVENTION




An object of the present invention is to provide a molding device which molds an inner portion of a paper pipe.




Another object of the present invention is to provide a molding device which has a lubricating oil to lubricate an inner portion of a paper pipe.




Accordingly, a molding device for molding an inner portion of a paper pipe comprises a molding head, an annular seat disposed on the molding head, an oil supply tube inserted through the annular seat and inserted in the molding head, a rotating device connected to the oil supply tube, and an oil pipe connected to the rotating device. The molding head has a center hole, a plurality of threaded apertures, an annular guide groove, a plurality of round holes communicating with the annular guide groove, a plurality of expanders, a plurality of expander receiving grooves, and a plurality of shafts. Each of the expanders is inserted in the corresponding expander receiving groove of the molding head. Each of the shafts has a recess. Each of the shafts is inserted through the corresponding round hole of the molding head.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a perspective exploded view of a molding device for molding an inner portion of a paper pipe of a preferred embodiment in accordance with the present invention;





FIG. 2

is a top plan view of a molding head of a preferred embodiment in accordance with the present invention;





FIG. 3A

is a sectional view of a paper pipe and a molding head of a preferred embodiment in accordance with the present invention;





FIG. 3B

is another sectional view of a paper pipe and a molding head of a preferred embodiment in accordance with the present invention;





FIG. 4

is a sectional view taken along line A—A in

FIG. 2

;





FIG. 5

is a sectional view taken along line B—B in

FIG. 2

;





FIG. 6

is a sectional view taken along line C—C in

FIG. 2

;





FIG. 7

is a sectional view taken along line D—D in

FIG. 2

;





FIG. 8A

is a sectional view of a paper pipe which has a smooth end edge;





FIG. 8B

is a sectional view of a paper pipe which has an inward incurved end and a chamfer angle;





FIG. 9

is a sectional view of a molding head of a preferred embodiment in accordance with the present invention; and





FIG. 10

is a sectional assembly view of a molding device for molding an inner portion of a paper pipe of a preferred embodiment in accordance with the present invention.











DETAILED DESCRIPTION OF THE INVENTION




Referring to

FIGS. 1

to


10


, a molding device for molding an inner portion of a paper pipe comprises a molding head


2


, an annular seat


50


disposed on the molding head


2


, an oil supply tube


5


inserted through the annular seat


50


and inserted in the molding head


2


, a rotating device


6


connected to the oil supply tube


5


, and an oil pipe


61


connected to the rotating device


6


.




The molding head


2


has a center hole


26


, a plurality of threaded apertures


20


to receive fasteners in order to position the molding head


2


on a machine (not shown in the figures), an annular guide groove


21


, a plurality of round holes


22


communicating with the annular guide groove


21


, a plurality of expanders


4


, a plurality of expander receiving grooves


23


, and a plurality of shafts


3


. Each of the expanders


4


is inserted in the corresponding expander receiving groove


23


of the molding head


2


.




Each of the shafts


3


has a recess


31


.




Each of the shafts


3


is inserted through the corresponding round hole


22


of the molding head


2


.




A first bolt


51


fastens the annular seat


50


and the molding head


2


together.




A second bolt


52


fastens the annular seat


50


and the oil supply tube


5


together.




The oil supply tube


5


has an oil release channel


53


and a plurality of oil release holes


54


communicating with the oil release channel


53


.




The molding head


2


further has an annular channel


27


matching the oil release holes


54


of the oil supply tube


5


, and a plurality of oil apertures


25


communicating with the center hole


26


.




When a paper pipe


1


is inserted in the annular guide groove


21


of the molding head


2


, a lubricating oil will flow from the oil pipe


61


to the rotating device


6


, then to the oil supply tube


5


, and then to the molding head


2


in order to lubricate an inner portion of the paper pipe


1


.




When the rotating device


6


is rotated, the rotating device


6


drives the oil supply tube


5


to rotate. The oil supply tube


5


drives the molding head


2


to rotate.




Referring to

FIG. 3B

, an inner end portion


10


of the paper pipe


1


is pared so that the inner end portion


10


of the paper pipe


1


is easily bent by the shafts


3


of the molding device of the present invention in order to form an inward incurved end


11


.




The expanders


4


decrease a friction between the paper pipe


1


and the molding head


2


.




Referring to

FIGS. 5 and 7

, each of the expanders


4


has a stepped portion


41


to cut the inner end portion


10


of the paper pipe


1


to form a chamfer angle


12


.




The molding head


2


further has a plurality of threaded holes


24


.




Each of the threaded holes


24


of the molding head


2


receives a screw


40


.




The present invention has the following advantages. The inner portion of the paper pipe is processed by the molding head of the present invention smoothly. A chamfer angle of the inner end portion of the paper pipe is easily formed. The inner portion of the paper pipe is lubricated by the lubricating oil.




The present invention is not limited to the above embodiment but various modification thereof may be made. Furthermore, various changes in form and detail may be made without departing from the scope of the present invention.



Claims
  • 1. A molding device for molding an inner portion of a paper pipe comprises:a molding head, an annular seat disposed on the molding head, an oil supply tube inserted through the annular seat and inserted in the molding head, a rotating device connected to the oil supply tube, and an oil pipe connected to the rotating device, the molding head having a center hole, a plurality of threaded apertures, an annular guide groove, a plurality of round holes communicating with the annular guide groove, a plurality of expanders, a plurality of expander receiving grooves, and a plurality of shafts, each of the expanders inserted in the corresponding expander receiving groove of the molding head, each of the shafts having a recess, and each of the shafts inserted through the corresponding round hole of the molding head.
  • 2. The molding device as claimed in claim 1, wherein each of the expanders has a stepped portion.
  • 3. The molding device as claimed in claim 1, wherein the oil supply tube has an oil release channel and a plurality of oil release holes communicating with the oil release channel, and the molding head further has an annular channel matching the oil release holes of the oil supply tube and a plurality of oil apertures communicating with the center hole.
  • 4. The molding device as claimed in claim 1, wherein a first bolt fastens the annular seat and the molding head together.
  • 5. The molding device as claimed in claim 4, wherein a second bolt fastens the annular seat and the oil supply tube together.
US Referenced Citations (5)
Number Name Date Kind
2778287 Moore Jan 1957 A
3723043 Leopold et al. Mar 1973 A
4483670 Yamamoto et al. Nov 1984 A
4680016 Lynch Jul 1987 A
6120426 Bacon Sep 2000 A