Cutting – Interrelated tool actuating and work guide moving means
Reexamination Certificate
1998-10-21
2002-09-24
Vo, Peter (Department: 3729)
Cutting
Interrelated tool actuating and work guide moving means
C083S602000, C083S628000, C083S923000
Reexamination Certificate
active
06453785
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hoop material cutter which is installed on an automatic press machine or the like to cut a scrap hoop material, and, more particularly, to a cutting blade guide for guiding the movable blade of a hoop material cutter in a reciprocating motion.
2. Description of the Related Art
This type of hoop material cutter is known and disclosed in, for example, U.S. Pat. No. 4,664,007. In this hoop material cutter, as shown in
FIG. 11
, as a cam
10
secured via a key
9
to the shaft
8
of a motor
6
rotates, a ram
4
moves reciprocally via a bearing
19
, while rocking, so that a hoop material is cut between a movable blade
3
attached to the bottom side of the ram
4
and a fixed blade
2
secured to the base plate.
Some schemes of guiding the end faces of the movable blade in reciprocation in this hoop material cutter are taught in, for example, Japanese Unexamined Patent Publication No. Hei 7-60531 and Japanese Unexamined Patent Publication No. Hei 7-60532.
According to the invention disclosed in Japanese Unexamined Patent Publication No. Hei 7-60531, as apparent from a plan view of the ram
4
in
FIG. 12
, both end faces of the movable blade
3
secured to the front portion of the bottom side of the ram
4
are guided by a pair of guide pins
54
which are rotatably provided on a base plate
1
. In this structure, the width of the ram
4
is designed smaller than the width of an opening
63
of the base plate
1
, and an oil can manually be supplied to the guide pins
54
from the outer surface of the base plate
1
via nipples
62
and oil holes
61
.
According to the invention disclosed in Japanese Unexamined Patent Publication No. Hei 7-60532, as shown in
FIG. 13
, the ram
4
in
FIG. 11
is designed in such a way that the distance between two parallel sides
4
a
and
4
b
is set greater than the width of an opening portion
1
a
,
1
b
of the base plate
1
and the wide parallel portion is provided on the slide surface of the base plate
1
, thereby ensuring more stable reciprocation of the ram
4
. Further, cutting blade guides
28
a
and
28
b
are provided between end faces
3
a
and
3
b
of the movable blade
3
secured to the front end portion of the bottom side of the ram
4
and the inner walls of the opening portion
1
a
,
1
b
of the base plate
1
. The cutting blade guides
28
a
and
28
b
are so designed as to fit guide pins
11
a
and
11
b
in a rotatable manner in respective prismatic blocks
29
a
and
29
b
, which are fitted detachable in a horizontal direction from the base plate
1
, and to cause the cylindrical surfaces of the guide pins
11
a
and
11
b
to protrude sideways from the associated blocks, whereby the end faces
3
a
and
3
b
of the movable blade
3
are guided by the protruding portions.
The aforementioned conventional hoop material cutter is provided with a hopper
30
which guides a hoop material A between the movable blade
3
and the fixed blade
2
at the time of cutting the hoop material A.
As shown in
FIG. 11
, the hopper
30
comprises a lower guide
31
for guiding the bottom side of a hoop material A
1
and a stock guide
32
provided upright for stopping feeding of a hoop material A
2
.
As mentioned above, the guide pins
54
of the hoop material cutter described in Japanese Unexamined Patent Publication No. Hei 7-60531 are so designed as to permit manual supply of an oil to the guide pins
54
via the nipples
62
from outside the base plate
1
. When a user forgets oil supply to the guide pins
54
, for example, and the oil runs out, however, the guide pins
54
will not rotate smoothly, accelerating the wear-out of the cylindrical surfaces, which is likely to cause settling of the guide pins
54
. In addition, the attachment of the nipples
62
undesirably makes the side surfaces of the base plate
1
weaker.
The hoop material cutter described in Japanese Unexamined Patent Publication No. Hei 7-60532, as shown in
FIG. 13
, is constructed in such a manner that the lubricating fluid is supplied to the slide surfaces of the wide parallel portion
4
a
,
4
b
of the ram
4
via oil holes
15
, a groove
23
, a through hole
17
and a groove
24
from nipples
16
in FIG.
11
. Although the fluid is further led to the guide pins
11
a
and
11
b
via the slide surfaces, it is difficult to sufficiently supply the fluid there. As a result, the guide pins
11
a
and
11
b
will not rotate smoothly, so that the cylindrical surfaces of the guide pins
11
a
and
11
b
are apt to wear out. As the cylindrical surfaces of the guide pins
11
a
and
11
b
wear out, therefore, settling occurs at the end portions of the guide pins
11
a
and
11
b
. This settling imparts the rotational resistance that makes the rotation of the guide pins harder and harder.
The conventional hoop material cutter has not sufficiently overcome the adverse influence of the attachment position of the hopper
30
on the action of cutting the hoop material A. For example, when the lower guide
31
is improperly positioned at the cutting time in
FIG. 14
, the hoop material A
1
abuts on the lower end portion of the lower guide
31
and is bent. Consequently, not only a cut chip A
3
is deformed, but also the lifetime of the cutting blade becomes shorter due to the poor cutting condition. If the stock guide
32
is positioned improperly, chips or debris
38
may come onto the slide surfaces from the top surface of the movable blade
3
, adversely affecting the action of the ram
4
.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide cutting blade guides for a hoop material cutter, which ensure the smooth rotation of guide pins for guiding a movable blade and facilitate the maintenance of the guide pins.
It is another object of this invention to provide a hoop material cutter capable of smoothly guiding a hoop material between a fixed blade and a movable blade for adequate cutting of the hoop material and also cutting the hoop material without affecting the action of the movable blade.
To achieve the objects, according to one aspect of this invention, a hoop material cutter for cutting a hoop material comprises a base plate; a ram movable reciprocally while rocking; a movable blade secured to a bottom surface of the ram; a fixed blade secured to a top surface of the base plate; a hopper for guiding a hoop material between the movable blade and the fixed blade; and cylindrical guide pins rotatably fitted in the base plate and each having both ends chamfered, cylindrical surfaces of the guide pins having projections protruding sideways of the base plate for guiding end faces of the movable blade, whereby the hoop material cutter cuts the hoop material while allowing the movable blade to move toward and away from the fixed blade in accordance with an action of the ram.
As both ends of each guide pin are chamfered, the chamfered portions become an oil retainer to ensure sufficient oil supply, and if the cylindrical surfaces of the guide pins wear out, causing settling, the settling is accommodated in the space that is formed by the chamfered portions, thus preventing the guide pins from rotating unsmoothly.
According to another aspect of this invention, a hoop material cutter for cutting a hoop material comprises a base plate; a ram movable reciprocally while rocking; a movable blade secured to a bottom surface of the ram; a fixed blade secured to a top surface of the base plate; a hopper for guiding a hoop material between the movable blade and the fixed blade; and cylindrical guide pins rotatably fitted in the base plate via blocks and each having both ends chamfered, cylindrical surfaces of the guide pins having projections protruding sideways of the blocks for guiding end faces of the movable blade, whereby the hoop material cutter cuts the hoop material while allowing the movable blade to move toward and away from the fixed blade in accordance with an action of the ram.
As both ends of each guide pin are chamfered, the chamfered po
Ostrolenk Faber Gerb & Soffen, LLP
Trinh Minh
Vo Peter
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