Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Reexamination Certificate
1999-11-24
2001-09-25
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
C241S242000
Reexamination Certificate
active
06293482
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a method and an apparatus for cutting a strand of a slide-cut system used in a plastics pellet manufacturing apparatus.
2. Related art
An example of a conventional strand cutting apparatus used in a pellet manufacturing apparatus will be explained.
FIG. 13
is an explanatory schematic diagram showing the entire configuration of an example of conventional pellet manufacturing apparatuses of a strand-cut system. This pellet manufacturing apparatus is arranged in a manner that plastics is plasticized by an extruding device
101
, then a strand
103
is extruded by an extruding die
102
, then the strand
103
thus extruded is cooled and solidified by being passed through a cooling water bath
104
, then the strand thus solidified is introduced into a strand cutting apparatus
105
through a guide roller
108
and sequentially cut into pellets.
The strand cutting apparatus
105
includes a take-up roller
106
formed by a pair of upper and lower rollers for taking up and sending a strand
103
on a fixed blade
112
, the fixed blade
112
having a blade edge extending perpendicularly with respect to the traveling direction of the strand
103
, a disc-shaped rotation cutter
110
for sequentially cutting the strand
103
thus sent on the fixed blade
112
, and a motor
109
for rotating the rotation shaft
111
of the rotation cutter
110
, or the like.
As shown in
FIGS. 14 and 15
, the rotation shaft
111
of the rotation cutter
110
is pivotally supported in a state that the shaft is disposed so as to be perpendicular to the blade edge of the fixed blade
112
and deviated toward the one side of the fixed blade
112
. The rotation cutter
110
is provided on the front surface thereof opposing to the blade edge of the fixed blade
112
with a plurality of plate-shaped blades
113
disposed radially. The blade edge of the plate-shaped blade
113
crosses with the blade edge of the fixed blade
112
with an angle&thgr; so as to sequentially cut the strand
103
into pellets P
0
. The rotation cutter
110
is provided on the front surface thereof with a plurality of guide grooves
114
for guiding the pellets P
0
thus cut.
The plurality of plate-shaped blades
113
are fitted into plate-shaped guide grooves
117
provided on the front surface of the rotation cutter
110
, respectively. The plate-shaped blades
113
are arranged to be fixed to the rotation cutter
110
by fastening the fastening bolts
116
after adjusting amounts of protrusion of the bladed edges of the plate-shaped blades by rotating forwardly and reversely the push pull bolts
115
which are engaged with the screw holes provided at the rear surface side of the rotation cutter
110
, respectively.
According to the aforesaid conventional technique, at the time of adjusting the amounts of protrusion of the bladed edges of the respective plate-shaped blades from the front surface of the rotation cutter so as to provide a predetermined clearance between the bladed edges of the respective plate-shaped blades of the rotation cutter and the blade edge of the fixed blade, the length (distance) of the clearance between the bladed edge of the plate-shaped blades of the rotation cutter and the blade edge of the fixed blade is measured manually by using a clearance gauge at every blade edge of the respective plate-shaped blades. Thus, there arises a problem that the adjusting procedure of the length is troublesome and requires high skill and further there arises a problem as to safety that a hand or a finger may be injured.
Further, since the rotation shaft etc. of the rotation cutter extends due to the thermal expansion, unless the length of the clearance between the bladed edge of the plate-shaped blades disposed at the rotation cutter and the blade edge of the fixed blade is set to be longer than the extension length caused by the thermal expansion, there arises a problem that such an accident occurs that the bladed edges of the respective plate-shaped blades of the rotation cutter interfere with the blade edge of the fixed blade to break the blade edges.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made in view of the aforesaid problems of the prior art, and an object of the present invention is to realize a strand cutting apparatus which can perform easily and safely the adjusting procedure of a clearance between the bladed edges of the respective plate-shaped blades disposed at a rotation blade and the blade edge of a fixed blade.
Another object of the present invention is to realize a method and an apparatus for cutting a strand which can avoid the occurrence of such an accident that the bladed edges of the respective plate-shaped blades of a rotation cutter interfere with the blade edge of a fixed blade to break the blade edges.
In order to attain the aforesaid object, the strand cutting method according to the present invention is provided by comprising the steps of:
sequentially abutting blade edges of plate-shaped blades disposed radially at a rotation blade by means of push pull bolts against a blade edge of a fixed blade having the blade edge extending perpendicularly with respect to a traveling direction of the strand; and
after fastening the plate-shaped blades by fastening bolts, separating the rotation blade from the fixed blade to adjust a clearance between the blade edge of the fixed blade and the blade edges of the plate-shaped blades.
Also, the strand cutting method according to the present invention is provided by comprising the steps of:
On a pedestal to which a fixed blade having a blade edge extending perpendicularly with respect to a traveling direction of a strand, placing a blade edge adjusting jig having a wall surface with such a height that an entire length of each of the blade edges of the plate-shaped blades disposed radially at a rotation blade extends to the entire height and a surface which is provided at a rear side of the wall surface so as to be in parallel to the wall surface and have a uniform thickness and against which the blade edge of the fixed blade abuts;
sequentially abutting the plate-shaped blades disposed radially at the rotation blade against the wall surface due to dead weights of the plate-shaped blades thereby to fasten the plate-shaped blades by fastening bolts and to remove the blade edge adjusting jig; and
moving the rotation blade closely to the fixed blade to adjust a clearance between the blade edge of the fixed blade and the blade edges of the plate-shaped blades.
The strand cutting apparatus according to the present invention is arranged in a manner that in the strand cutting apparatus including a fixed blade having a blade edge extending perpendicularly with respect to a traveling direction of a strand, a supporting member opposing to one side of the fixed blade with a clearance therebetween, a rotation shaft supported by a supporting member through a bearing mechanism so as to be freely rotatable and extending perpendicularly to the blade edge of the fixed blade, a disc-shaped rotation blade provided integrally at a tip end of the rotation shaft, a plurality of guide grooves provided radially on a front surface of the rotation shaft opposing to the blade edge of the fixed blade, and plate-shaped blades respectively disposed in the guide so that an amount of protrusion of each of blade edges of the plate-shaped blades is freely changed, the strand cutting apparatus is provided in that
the supporting member is guided by a guide means so as to be movable freely and linearly along a same direction as an axial direction of the rotation shaft, the rotation shaft integrally provided at a tip end of the rotation shaft is linearly moved to the same direction as the axial direction of the rotation shaft so that a clearance between the blade edge of the fixed blade and the blade edges of the plate-shaped blades can be adjusted.
Preferably, a blade edge adjusting jig for adjusting the clearance between the blade edge of the fixed blade and the blade edges of the plat
Horie Kunihiro
Takata Minori
Tamaki Yoshihito
Yoshida Minoru
Rosenbaum Mark
Sughrue Mion Zinn Macpeak & Seas, PLLC
The Japan Steel Works Ltd.
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