WO1998021016A1 - Press roll unit for reel-up of paper cutter - Google Patents

Press roll unit for reel-up of paper cutter Download PDF

Info

Publication number
WO1998021016A1
WO1998021016A1 PCT/FI1997/000681 FI9700681W WO9821016A1 WO 1998021016 A1 WO1998021016 A1 WO 1998021016A1 FI 9700681 W FI9700681 W FI 9700681W WO 9821016 A1 WO9821016 A1 WO 9821016A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll unit
press roll
rolls
electric motor
reel
Prior art date
Application number
PCT/FI1997/000681
Other languages
French (fr)
Inventor
Klaus Uuskoski
Jouko Virta
Original Assignee
Kci Konecranes International Plc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kci Konecranes International Plc filed Critical Kci Konecranes International Plc
Priority to US09/297,934 priority Critical patent/US6179242B1/en
Priority to DE19782110T priority patent/DE19782110T1/en
Publication of WO1998021016A1 publication Critical patent/WO1998021016A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/1004—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys
    • H02K7/1012—Machine arranged inside the pulley

Definitions

  • the invention relates to a press roll unit for a reel-up of a paper cutter, the press roll unit comprising two adjacent rolls around which there runs a belt arrangement operatively interconnecting the rolls, an electric motor driving the roll unit being arranged inside at least one roll.
  • Electric motors are usually cooled by blowing air through conduits inside or on the surface of the motor by means of a blower that is mounted on the shaft of the electric motor or is driven by a separate motor. It is essential that the rate of the air current passing the surface to be cooled is rendered sufficiently high.
  • the electric motor driving the unit is an external rotor motor which is mounted inside a press roll and which cannot be cooled normally.
  • the belt arrangement covering the rolls is usually made of rubber, and so heat does not transfer sufficiently, since the rubber belt has poor heat conductivity as compared with steel, which the rolls are made from.
  • the object of the present invention is to eliminate the above drawback, i.e. to effect sufficient cooling of the motor itself and the surface of the roll located at the motor.
  • the object is achieved with a press roll unit which is characterized in that at least one aperture is formed in the belt arrangement so as to cool the electric motor and the roll surrounding it.
  • the invention is based on the idea that the surface of a rotating roll is brought into direct contact with the surrounding air, which ensures efficient transfer of heat from the roll to the air.
  • the most preferable solution is probably one in which the belt arrangement comprises at least two belts spaced at a predefined distance from each other to form the above-mentioned at least one cooling aperture.
  • FIG. 1 shows a common press roll unit
  • fig. 2 shows a preferred press roll unit according to the invention
  • figs. 3 and 4 show alternative embodiments according to the invention.
  • a common press roll unit for a reel-up of a paper cutter shown in fig. 1 comprises two adjacent rolls 1 and 2 around which there runs a continuous rubber belt 3 that interconnects the rolls operatively, extends over the entire width of the rolls, and covers them entirely.
  • an electric motor 4 is arranged inside both rolls 1 and 2.
  • the press roll unit can also be used by an electric motor arranged in a single roll.
  • the press roll unit of the invention shown in fig. 2 differs from the common solution of fig. 1 in that the belt arrangement running around the rolls 1 and 2 is divided into two belts 30A and 30B that are spaced from each other such that there is an open space 5 between them at the electric motor 4 located inside the roll 1 ,2.
  • the heat conducted from the motor 4 to the roll 1 ,2 can therefore be transferred effectively to the air thanks to the difference of rate between the surrounding air and the roll 1 ,2, and so the temperature of the motor 4 and the roll 1 ,2 can be maintained considerably lower than in the solution described above in fig. 1.
  • the belt arrangement is divided into an even larger number of separate belts 30N, and so there is also a larger number of spaces 5 between the belts 30N that cool the roll 1 ,2 and the motor 4. Any heat conducted towards the ends of the rolls 1 ,2 can then be discharged more effectively, as a result of which the heat stress in the roll unit decreases further.
  • Fig. 4 in turn shows another alternative structure according to the invention, which comprises a belt 30 running around the rolls 1 ,2 and extending over the entire width of the rolls, like in the common solution shown in fig. 1.
  • This structure is perforated (perforations 5') in the circumferential direction at least at the electric motor 4 so as to effect the above-described direct contact between the roll surface and the surrounding air, and the cooling resulting from the direct contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Paper (AREA)
  • Press Drives And Press Lines (AREA)
  • Handling Of Sheets (AREA)

Abstract

The invention relates to a press roll unit for a reel-up of a paper cutter, the press roll unit comprising two adjacent rolls (1, 2) around which there runs a belt arrangement (30A, 30B) operatively interconnecting the rolls, an electric motor (4) driving the roll unit being arranged inside at least one roll. The belt arrangement (30A, 30B) comprises at least one aperture (5) for cooling the electric motor and the roll surrounding it.

Description

PRESS ROLL UNIT FOR REEL-UP OF PAPER CUTTER
The invention relates to a press roll unit for a reel-up of a paper cutter, the press roll unit comprising two adjacent rolls around which there runs a belt arrangement operatively interconnecting the rolls, an electric motor driving the roll unit being arranged inside at least one roll.
Electric motors are usually cooled by blowing air through conduits inside or on the surface of the motor by means of a blower that is mounted on the shaft of the electric motor or is driven by a separate motor. It is essential that the rate of the air current passing the surface to be cooled is rendered sufficiently high.
Where a press roll unit is concerned, the electric motor driving the unit is an external rotor motor which is mounted inside a press roll and which cannot be cooled normally. The belt arrangement covering the rolls is usually made of rubber, and so heat does not transfer sufficiently, since the rubber belt has poor heat conductivity as compared with steel, which the rolls are made from.
The object of the present invention is to eliminate the above drawback, i.e. to effect sufficient cooling of the motor itself and the surface of the roll located at the motor. The object is achieved with a press roll unit which is characterized in that at least one aperture is formed in the belt arrangement so as to cool the electric motor and the roll surrounding it.
The invention is based on the idea that the surface of a rotating roll is brought into direct contact with the surrounding air, which ensures efficient transfer of heat from the roll to the air. The most preferable solution is probably one in which the belt arrangement comprises at least two belts spaced at a predefined distance from each other to form the above-mentioned at least one cooling aperture.
In the following the invention will be described in greater detail by means of some preferred embodiments and with reference to the attached drawings, in which fig. 1 shows a common press roll unit, fig. 2 shows a preferred press roll unit according to the invention, and figs. 3 and 4 show alternative embodiments according to the invention. A common press roll unit for a reel-up of a paper cutter shown in fig. 1 comprises two adjacent rolls 1 and 2 around which there runs a continuous rubber belt 3 that interconnects the rolls operatively, extends over the entire width of the rolls, and covers them entirely. To use the press roll unit, an electric motor 4 is arranged inside both rolls 1 and 2. Alternatively, the press roll unit can also be used by an electric motor arranged in a single roll.
The press roll unit of the invention shown in fig. 2 differs from the common solution of fig. 1 in that the belt arrangement running around the rolls 1 and 2 is divided into two belts 30A and 30B that are spaced from each other such that there is an open space 5 between them at the electric motor 4 located inside the roll 1 ,2. The heat conducted from the motor 4 to the roll 1 ,2 can therefore be transferred effectively to the air thanks to the difference of rate between the surrounding air and the roll 1 ,2, and so the temperature of the motor 4 and the roll 1 ,2 can be maintained considerably lower than in the solution described above in fig. 1.
In the alternative solution of the invention shown in fig. 3 the belt arrangement is divided into an even larger number of separate belts 30N, and so there is also a larger number of spaces 5 between the belts 30N that cool the roll 1 ,2 and the motor 4. Any heat conducted towards the ends of the rolls 1 ,2 can then be discharged more effectively, as a result of which the heat stress in the roll unit decreases further.
Fig. 4 in turn shows another alternative structure according to the invention, which comprises a belt 30 running around the rolls 1 ,2 and extending over the entire width of the rolls, like in the common solution shown in fig. 1. This structure, however, is perforated (perforations 5') in the circumferential direction at least at the electric motor 4 so as to effect the above-described direct contact between the roll surface and the surrounding air, and the cooling resulting from the direct contact.
The above-described reduction of heat stress enhances the wear resistance of the motor 4, the rolls 1 ,2 and the belt arrangement, and reduces harmful heat expansion caused by the uneven heating of the rolls 1 ,2.
The invention is described above only by means of a few preferred embodiments. A skilled worker, however, can implement the structure freely without deviating from the scope defined by the attached claims.

Claims

1. A press roll unit for a reel-up of a paper cutter, the press roll unit comprising two adjacent rolls (1,2) around which there runs a belt arrangement (3; 30A, 30B; 30N; 30) operatively interconnecting the rolls, an electric motor (4) driving the roll unit being arranged inside at least one roll, characterized in that the belt arrangement (30A, 30B; 30N; 30) comprises at least one aperture (5) for cooling the electric motor (4) and the roll (1, 2) surrounding it.
2. A press roll unit according to claim 1, characterized in that the belt arrangement comprises at least two belts (30A, 30B; 30N) that are spaced at a predefined distance from each other so as to form said at least one cooling aperture (1, 2).
3. A press roll unit according to claim 1, characterized in that the belt arrangement comprises a belt (30) around the circumference of which there is provided a plural number of cooling apertures (5).
4. A press roll unit according to claim 3, characterized in that the cooling apertures (5) are provided by perforation on the belt.
5. A press roll unit according to any one of the preceding claims, characterized in that the cooling aperture/apertures (5) is/are arranged at least at the driving electric motor (4).
PCT/FI1997/000681 1996-11-11 1997-11-10 Press roll unit for reel-up of paper cutter WO1998021016A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/297,934 US6179242B1 (en) 1997-11-10 1997-11-10 Press roll unit for reel-up of paper cutter
DE19782110T DE19782110T1 (en) 1996-11-11 1997-11-10 Press roller unit for a reel-up of a paper cutter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI964523 1996-11-11
FI964523A FI102663B1 (en) 1996-11-11 1996-11-11 Press roll unit for paper cutter reel

Publications (1)

Publication Number Publication Date
WO1998021016A1 true WO1998021016A1 (en) 1998-05-22

Family

ID=8547046

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000681 WO1998021016A1 (en) 1996-11-11 1997-11-10 Press roll unit for reel-up of paper cutter

Country Status (4)

Country Link
DE (1) DE19782110T1 (en)
FI (1) FI102663B1 (en)
FR (1) FR2755635B1 (en)
WO (1) WO1998021016A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518300A (en) * 1982-11-12 1985-05-21 Control Process, Inc. Take-away technique for sliced bulk products
EP0274229A2 (en) * 1986-12-10 1988-07-13 Thurne Engineering Co Ltd Conveyor system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1951182A (en) * 1930-04-15 1934-03-13 Hammermill Paper Co Four-drum winder
DE2347274A1 (en) * 1973-09-20 1975-04-10 Supra Verpackung Gmbh Glued strip transporter mechanism - conveys by belts running faster than strip in straight line
DE2446274A1 (en) * 1974-09-27 1976-04-08 Duroform Plastic J Fritz Kg Resin impregnated matted fibre web cutting machine - with endless chain conveying belts for frictional feeding of web past slitter
GB2032703B (en) * 1978-10-18 1983-01-06 Dowty Meco Ltd Rotary drum device
JPS61197353A (en) * 1985-02-22 1986-09-01 Takehara Kikai Kenkyusho:Kk Transport body for adhesive band-shaped article
IT1265863B1 (en) * 1993-03-12 1996-12-12 Biancalani & C Off Mec MACHINE FOR TREATMENT OF FABRIC IN ROPE, WITH INCORPORATING ELECTRIC DRIVE MOTORS, FOR MILLING AND FOR OTHER OPERATIONS.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518300A (en) * 1982-11-12 1985-05-21 Control Process, Inc. Take-away technique for sliced bulk products
EP0274229A2 (en) * 1986-12-10 1988-07-13 Thurne Engineering Co Ltd Conveyor system

Also Published As

Publication number Publication date
FI102663B (en) 1999-01-29
FR2755635B1 (en) 2000-02-11
FI964523A0 (en) 1996-11-11
FR2755635A1 (en) 1998-05-15
FI102663B1 (en) 1999-01-29
FI964523A (en) 1998-05-12
DE19782110T1 (en) 1999-12-16

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