Back gauge device

Details Back gauge device Back gauge device

1999-06-16

2001-04-10

Jones, David (Department: 3725)

Metal deforming

By or with work-constrainer and/or manipulated work-forcer

Comprising work-stopping abutment

C072S389300

Reexamination Certificate

active

06212933

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a back gauge device, and more particularly to a back gauge device which moves abutments forward, backward, upward and downward by using link mechanisms and a back gauge device whose mechanisms for moving both ends of a stretch to which he abutments have been attached, operate independently from each other.
BACKGROUND ART
A press brake type bending machine, for example, is available as a conventional bending machine which is an example of a sheet metal machine.
Bending machines of this type are designed so that one of an upper table having a punch mounted thereon and a lower table having a die mounted thereon is moved upward and downward to apply bending processing to a workpiece by the cooperation of the punch and the die.
In light of this, if the bending machines are classified by a movable table (ram), they can be classified into two large groups of a lifting-up type in which the lower table is moved upward and downward and a lifting-down type in which the upper table is moved upward and downward. According to a lifting-up or lifting-down type bending machine, a back gauge device is arranged on its back part, and a workpiece is positioned prior to the bending processing, as is well known in the art.
The manual back gauge device illustrated in FIG.
9
(A) and the automatic back gauge device depicted in FIG.
9
(B) are available as back gauge devices for conventional lifting-up type bending machines. Either back gauge device comprises two supporters
104
extending from a lower table
100
(FIG.
9
(C)) in a Y-axial direction, and posts
107
provided one on each of the supporters
104
.
Of the above-described back gauge devices, the manual back gauge device (FIG.
9
(A)) is one in which abutments
105
are attached to a stretch
106
engaged with screws
108
arranged at both ends of the stretch
106
, and is designed so that the abutments
105
are moved in a Z-axial direction by manually rotating the screws
108
.
Further, the automatic back gauge device (FIG.
9
(B)) is one in which the abutments
105
attached to the stretch
106
are engaged with ball screws
110
in housings
116
, and the back gauge device is designed so that the abutments
105
are moved in the Z-axial direction along guides
109
by driving motors M to rotate the ball screws
110
.
However, according to the conventional lifting-up type bending machine, as should be apparent from FIG.
9
(C), a stay
102
which couples side plates
103
arranged on both sides of the lower table
100
, and the pressure-oil tank
111
of a cylinder
101
for the lower table
100
, are provided under the supporters
104
.
Consequently, because structures such as the aforementioned stay
102
, etc. constitute an obstacle, the posts
107
(FIG.
9
(A), FIG.
9
(B)) which support the stretch
106
, the screws
108
(FIG.
9
(A)) included in mechanisms for driving the abutments
105
, the motors M and the ball screws
110
(FIG.
9
(B)) cannot be extended downward and cannot help but protrude above the abutments
105
.
Because of this, when the abutments
105
are moved downward in order to apply overhang processing to a workpiece W, the workpiece W interferes with the motors M above the abutments
105
as shown in FIGS.
9
(A) and
9
(B), due to which the positioning of the workpiece W cannot be performed.
Meanwhile, the back gauge device illustrated in
FIG. 10
is available as one for a lifting-down type bending machine.
This back gauge device includes columnar posts
107
which extend straight from the lower surfaces of both end portions of the stretch
106
to which the abutments
105
have been attached, and the columnar posts
107
have racks
107
A formed thereon.
As shown in the right-hand drawing of
FIG. 10
, pinions
112
engaged with the aforementioned racks
107
A are coupled to each other via a torsion bar
115
, and the torsion bar
115
is connected to a worm gear
113
via a left-end pinion
114
.
Therefore, if a motor (not shown) connected to the worm gear
113
is driven, the posts
107
move in the Z-axial direction via the pinion
114
and the pinions
112
, and accordingly the abutments
105
also move in the Z-axial direction.
As explained above, according to the lifting-down type bending machine illustrated in
FIG. 10
, the posts
107
extend below the abutments
105
. Thus, since there are no protrusions above the abutments
105
, the overhang processing can be applied to the workpiece W as shown in FIGS.
9
(A) and
9
(B).
However, as clearly seen from
FIG. 10
, the space under the stretch
106
is extremely narrow, since the posts
107
, the pinions
112
,
114
and the worm gear
113
are arranged under the stretch
106
.
Moreover, since the stretch
106
is merely supported by the two columnar posts
107
, the posts
107
are liable to warp, and the stretch
106
is considerably unsteady.
On the other hand, the above-described back gauge devices can be classified into two large groups of an independent type and a non-independent type if they are classified by left- and right-hand Z-axial driving mechanisms for upwardly and downwardly moving the stretch to which the abutments have been attached.
According to an independent type back gauge device, each of the Z-axial driving mechanisms comprises a motor Mz (FIG.
11
), and those mechanisms operate independently from each other when their respective motors are driven. According to a non-independent type back gauge device, the Z-axial driving mechanisms comprise a single common motor, and operate in cooperation with each other when the common motor is driven (FIG.
12
).
Of the above-described back gauge devices, one including independent type Z-axial driving mechanisms has the structure shown in
FIG. 11
, for example, and comprises two supporters
204
extending from a lower table
200
in the Y-axial direction, posts
207
provided one on each of the supporters
204
and each having a Z-axial motor Mz, a stretch
206
extending between the two posts
207
in an X-axial direction, and abutments
205
attached onto the stretch
206
.
The Z-axial motors Mz, the post
207
, ball screws (not shown) incorporated in the respective posts
207
and engaged with the stretch
206
, etc. form the Z-axial driving mechanisms for the stretch
206
.
According to the above-described structure, when the Z-axial motors Mz provided one on each of the posts
207
are driven, both Z-axial driving mechanisms operate independently from each other to move the stretch
206
upward and downward.
Meanwhile, the back gauge device illustrated in
FIG. 12
, for example, is available as one including non-independent type Z-axial driving mechanisms.
This back gauge device has columnar posts
207
which extend straight from the lower surfaces of both end portions of the stretch
206
to which the abutments
205
have been attached, and the columnar posts
207
have racks
207
A formed thereon.
As shown in the right-hand drawing of
FIG. 12
, pinions
212
engaged with the aforementioned racks
207
A are coupled to each other via a torsion bar
215
, the torsion bar
215
being coupled to a worm gear
213
via a left-end pinion
214
, and the worm gear
213
being connected to a single common motor (not shown).
The common motor, the worm gear
213
, the pinion
214
, the torsion bar
215
, the pinions
212
, the racks
207
A and the posts
207
form the Z-axial driving mechanisms for the stretch
206
.
Hence, when the common motor (not shown) connected to the worm gear
213
is driven, the posts
207
move in the Z-axial direction via the pinion
214
and the pinions
212
; that is, both Z-axial driving mechanisms operate interlocking with each other to move the entire stretch
206
upward and downward.
Of the independent type Z-axial driving mechanisms (
FIG. 11
) and the non-independent type Z-axial driving mechanisms (FIG.
12
), the latter non-independent type driving mechanisms (
FIG. 12
) are designed so that when the single common motor is driven, the rotations of the motor are communicated to the torsion bar
215
via the

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