Solid material comminution or disintegration – Apparatus – With temperature modification of material
Reexamination Certificate
1999-11-09
2001-09-18
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
With temperature modification of material
C241S225000, C241S242000
Reexamination Certificate
active
06290154
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a strand cutting apparatus used for a plastics pellet manufacturing apparatus.
2. Related Art
An example of a conventional strand cutting apparatuses used for a pellet manufacturing apparatus will be explained.
As shown in FIG.
7
(
a
), the conventional strand cutting apparatus includes a take-up roller
106
formed by a pair of upper and lower rollers for taking up and sending a strand
112
on a fixed blade
101
, the fixed blade
101
having a blade edge extending perpendicularly with respect to the traveling direction of the strand
112
, and a rotation blade
102
fixed to the tip portion of a rotation shaft
107
which is disposed in parallel to the traveling direction of the strand
112
. These take-up roller, fixed blade and rotation blade are disposed on an upper wall
120
a of a casing
120
and covered by a cover
121
which is provided so as to be freely opened and closed through a not-shown hinge portion.
As shown in FIG.
7
(
b
), the rotation blade
102
includes a rotation disc
103
fixed to the tip end of the rotation shaft
107
through a flange
107
a
, a plurality of projection portions
104
provided radially at the outer peripheral surface of the rotation disc
103
so as to protrude therefrom, and plate-shaped blades
105
fixed to the side surfaces of the projection portions
104
on the front sides of the rotation direction (the direction shown by an arrow) thereof, respectively. The rotation blade
102
is arranged in a manner that the rotation blade is rotated integrally with the rotation shaft
107
which is rotated through a transmission means
109
by a motor
108
mounted within the casing
120
thereby to cut the strands
112
by the blade edges of the respective plate-shaped blades
105
and the blade edge of the fixed blade
101
to sequentially form pellets.
In the aforesaid conventional technique, within the cover covering the rotation blade and the fixed blade or the like, the pellets scatter to the various direction in a manner that some pellets are flown outward by the rotation of the rotation blade along the radial direction thereof, and other pellets are dispersedly flown to the rear surface side of the rotation blade through the spaces among the respective projection portions of the rotation blade, then turned and fall into a falling opening. Thus, when the aforesaid conventional technique is employed for manufacturing the pellets made of plastics of rubber nature having a large friction coefficient, the pellets are piled up, so that it is required to perform the cleaning operation of the pellets frequently.
Further, since the take-up roller formed by the pair of upper and lower rollers are mounted on the casing, at the time of performing the cleaning operation and the maintenance operation of the apparatus, the cleaning operation and the maintenance operation of the lower roller and the fixed blade can not be started until the cover is opened and the upper roller is detached from the casing. As a result, the conventional technique has a problem that the cleaning operation and the maintenance operation are complicated.
SUMMARY OF INVENTION
The present invention was performed in view of the aforesaid problem of the conventional technique.
An object of the present invention is to realize a strand cutting apparatus wherein pellets formed by the cutting operation are prevented from being piled up and each of the cleaning operation and the maintenance operation is not complicated.
In order to achieve the aforesaid object, a strand cutting apparatus according to the present invention includes a take-up roller formed by a pair of upper and lower rollers for taking up and sending a strand on a fixed blade, the fixed blade having a blade edge extending perpendicularly with respect to a traveling direction of the strand, a disc-shaped rotation blade which has a rotation shaft disposed in parallel to the traveling direction of the strand and has a plurality of plate-shaped blades disposed radially at a front surface opposing to the blade edge of the fixed blade, and a cover for receiving pellets sequentially formed by cutting the strand by means of the fixed blade and the rotation blade and for exhausting the pellets out of the apparatus. The cover of the strand cutting apparatus is formed by a lower casing of almost funnel-shape having an opened portion at an upper surface thereof and an upper casing of a semicylindrical shape covering the opened portion of the lower casing, wherein a center of the upper casing is made eccentric toward the fixed blade side with respect to a rotation axis of the rotation blade so that a distance between an inner peripheral surface of the upper casing and a phantom outer peripheral circle drawn in accordance with a rotation of the rotation blade increases gradually toward the rotation direction of the rotation blade and becomes maximum at a side of the fixed blade.
the cover is formed by a lower casing of almost funnel-shape having an opened portion at an upper surface thereof and an upper casing of a semi-cylindrical shape covering the opened portion of the lower casing, wherein a center of the upper casing is made eccentric toward the fixed blade side with respect to a rotation axis of the rotation blade so that a distance between an inner peripheral surface of the upper casing and a phantom outer peripheral circle drawn in accordance with a rotation of the rotation blade increases gradually toward the rotation direction of the rotation blade and becomes maximum at a side of the fixed blade.
The strand cutting apparatus may be arranged in a manner that the upper casing is provided through a hinge portion so as to be freely opened and closed with respect to the opened portion of the lower casing, and the upper roller of the take-up roller is disposed on the upper casing side.
The strand cutting apparatus may be arranged in a manner that the rotation blade is provided with a plurality of cooling water holes which are provided radially so as to penetrate the rotation blade to the outer peripheral surface thereof from a hollow portion of the rotation shaft so that cooling water can be supplied toward the plate-shaped blades, and the lower casing is provided with a nozzle opened at an inner peripheral surface near the opened portion so that water can be supplied.
As described above, since the present invention is configured in the aforesaid manner, the present invention can attain the following technical advantages.
Since the pellets formed by the cutting operation are prevented from being piled up within the cover, the frequency for performing the cleaning operation and the maintenance operation can be remarkably reduced.
According to the present invention, since the upper roller can be separated from the lower roller and the upper surface side of the lower roller and the fixed blade can be opened by merely opening the upper cover, it is not required to remove and attach the upper roller at the time of performing the cleaning operation and the maintenance operation, so that these operations can be performed quite easily.
REFERENCES:
patent: 2524751 (1950-10-01), Berger
patent: 3831867 (1974-08-01), Hansen
patent: 3837586 (1974-09-01), Perschbacher et al.
patent: 382427 (1964-11-01), None
patent: 406613 (1966-08-01), None
patent: 26 00 078 (1977-07-01), None
patent: 0 013 575 (1980-01-01), None
patent: 0 462 887 A1 (1991-12-01), None
patent: 1 323 571 (1973-07-01), None
Takata Minori
Tamaki Yoshihito
Yoshida Minoru
Rosenbaum Mark
Sughrue Mion Zinn Macpeak & Seas, PLLC
The Japan Steel Works Ltd.
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