WO2001005532A1

WO2001005532A1 - Apparatus for bending a cutting blade

Info

Publication number: WO2001005532A1
Application number: PCT/KR2000/000781
Authority: WO
Inventors: Byung-Jun Song
Original assignee: Song Byung Jun
Priority date: 1999-07-19
Filing date: 2000-07-18
Publication date: 2001-01-25

Abstract

Disclosed is an apparatus for bending a cutting blade material including fixing members, a column having a slit into which a cutting blade material is inserted and fixed to the fixing members, bending members turned about the column's central shaft and performing a bending operation, driving members rotating the bending members about the column's central shaft, and control members each selectively connecting the bending members to the driving members or the fixing members, or disjointing the bending members from the driving members or the fixing members.

Description

APPARATUS FOR BENDING CUTTING BLADE

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to an apparatus for bending a cutting blade that

is used when cutting and bending a material such as a sheet of paper, a sheet of

leather, cloth, synthetic resin, etc. to a desired shape. More specifically, the present

invention relates to an apparatus for bending a cutting blade employing control

members that turn a bending member to a bending position just when bending a strip

(a cutting blade material), and makes the bending member be in a fixed position

when it is not working. More particularly, it relates to an apparatus for bending a

cutting blade with a pair of bending members in which one of the bending members

is moved to a working position and the other one stays in an original position, thus

avoiding restriction of a bending angle due to the other bending member.

(b) Description of the Related Art

A cutting blade is used being mounted on a wooden pattern to cut a sheet of

a material to a desired shape and form a bending line or cut-off line on one surface. The material, particularly, a sheet of paper such as corrugated paper, that is cut and

bent by the above cutting blade can be bent in the shape of a box.

Conventional arts are disclosed in US Patent Nos. 5,771,725 and 5,870,919.

The '725 Patent has a problem of limiting a bending angle since a pair of

bending members is rotating during bending operation. That is, in case of

continuously bending a cutting blade material in the same direction, the bending

member that is not working interferes with the cutting blade material. In addition,

the '725 patent discloses a notch forming part, and this notch forming part is installed

in the front irrelevant to the cutting blade bending apparatus, and driven by an extra

driving source (motor). Accordingly, if the operating time of the driving source is not

correctly set up in connection with the operation of the bending apparatus, the final

shape of the cutting blade bent by the bending apparatus becomes different from a

desired one.

Since a cutting apparatus for cutting the finished cutting blade material at

every given length is not linked with a bending apparatus like the above notch

cutting apparatus, it has the same problem as the notch cutting apparatus'.

In the '919 patent, a bending member used in the bending operation can be

moved up and down, and one bending member carries out the bending operation. Since driving devices respectively moving the bending members up and down during

rotation of the bending members interfere with each other, the range of the bending

operation, i.e. the bending angle is limited. Since a cutting apparatus for cutting the

finished material at every given length is not linked to the bending apparatus, the

'919 patent has the same problem as the '725 patent's.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an apparatus for bending a

cutting blade, having a bending member turning during bending operation only, and

enhancing the scope of bending.

It is another object of the present invention to provide an apparatus for

bending a cutting blade letting one bending member and the other bending member

turn and be not moved, respectively, when employing a pair of bending members,

thus increasing the bending range.

It is still another object of the present invention to provide an apparatus for

bending a cutting blade having driving members for operating a notch forming

member, a cutting member and a bending member, thus decreasing its overall size.

In order to achieve the above objects, the present invention provides an apparatus for bending a cutting blade material including fixing members, a column

having a slit into which a cutting blade material is inserted and fixed to the fixing

members, bending members turned about the column's central shaft and performing

a bending operation, driving members rotating the bending members about the

column's central shaft, and control members each selectively connecting the bending

members to the driving members or the fixing members, or disjoining the bending

members from the driving members or the fixing members.

The number of the bending members is two so as to carry out clockwise and

counterclockwise bending operation, and one of them is connected to the driving

members by the control members for the bending operation while the other one is

joined to the fixing members by the control members not to perform a relative

movement with respect to the fixing members.

The driving members are passive gears driven by a motor, and the passive

gears are rotatably provided to the fixing members with bearings interposed

therebetween so as to have the same center as the column's and have grooves formed

diametrally and receiving the control members to actuate the control members and

the bending members together during the bending operation.

The passive gears have a boss in an inner surface of its middle. The apparatus for bending a cutting blade material further includes a feed

part for feeding a cutting blade material, having a feed roller turned by a feed gear

and a support roller supporting the cutting blade material.

The apparatus further includes a notch forming part forming a notch on the

cutting blade material by the driving members' rotation. The notch forming part

includes a pressing member moved up and down through holes provided to the

respective fixing members and driving members, fixing dies supporting the cutting

blade material when forming a notch thereon, and a notch cutting member pressed by

the pressing member.

The inventive apparatus also includes a cutting part for cutting the cutting

blade material by the rotation of the driving members.

The cutting part includes a fixed cutting member moved up and down

through the holes provided to the respective fixing members and driving members,

and fixed during cutting operation, and a moving cutting member rotating along with

the driving members during the cutting operation.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention, and, together with the

description, serve to explain the principles of the invention:

FIG. 1 is a front-sectional view of an apparatus for bending a cutting blade

in accordance with the present invention;

FIG. 2 is an exploded perspective view of the apparatus for bending a

cutting blade of FIG. 1;

FIG. 3 is a perspective view of the elevating state of keys according to the

present invention;

FIGS. 4a and 4b are each sectional views as taken along line A- A of FIG. 2

for showing the operation of the keys in the inventive apparatus for bending a cutting

blade;

FIG. 4c is a sectional view as taken along line B-B of FIG. 2 for showing

the section of a column's slit;

FIG. 5 is a sectional view of a main part of the apparatus for bending a

cutting blade according to another preferred embodiment of the present invention;

FIG. 6 is a sectional view taken by cutting the middle section of the

apparatus for bending a cutting blade;

FIGS. 7a and 7b each depict a notch cutting device for the inventive apparatus for bending a cutting blade; and

FIGS. 8a to 8d each depict the processed shape of the respective cutting

blades cut by a cutting device of the inventive apparatus.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the following detailed description, only the preferred embodiment of the

invention has been shown and described, simply by way of illustration of the best

mode contemplated by the inventor(s) of carrying out the invention. As will be

realized, the invention is capable of modification in various obvious respects, all

without departing from the invention. Accordingly, the drawings and description are

to be regarded as illustrative in nature, and not restrictive.

FIG. 1 is a front-sectional view of the apparatus for bending a cutting blade

in accordance with the present invention. Fixing members fixing components of the

apparatus for bending a cutting blade are fixing dies 150 in FIG. 1. A driving shaft

120 coupled to a driving motor 110's motor shaft is rotatably provided to the middle

of respective fixing dies 150 with bearings 160 interposed therebetween. A pair of

driving gears 130 is respectively fixed to upper and lower ends of driving shaft 120,

and have a plane surface facing fixing dies 150. A feed roller 200 having a feed gear 220 at a lower portion is provided to the outer surface of driving shaft 120 with a

needle bearing 210 interposed therebetween. A support roller is interposed adjacent

to feed roller 200 to move cutting blade material 100 in cooperation with feed roller

200. A feed driving gear 230 for turning feed gear 220 is coplanar with feed gear 220.

Passive gear 140 turning in mesh with respective driving gears 130 has a

cylindrical portion 144 protruding on the middle. Cylindrical portion 144 is rotatably

held in a column insertion hole of each fixing die 150 with bearing 160 interposed

therebetween. A column 170 is installed in a central hole of respective passive gears

140, and fixed to fixing dies 150. A pair of bending members 180 is interposed

between the hole's inner surface and column 170 for bending operation. Bending

members 180 perform the bending operation, rotating along column 170's outer

surface.

Another fixing dies 150 (outer fixing dies) are provided to the outside of

respective passive gears 140 and driving gears 130 in order to support rotating

passive gears 140 and driving gears 130 and prevent them from being disjoined.

Fixing dies 150 relatively provided to the inside of gears 140 and the above outer

fixing dies 150 are removably joined to each other, and an air cylinder 192 is

provided to a hole formed adjacent to the column insertion hole of the outermost fixing die for pressing each key. Pressing members 270 for each pressing a cutting

blade of a notch cutting apparatus and a fixed cutting member 280 and a moving

cutting member 290 each constituting a cutting device for cutting a cutting blade

material are provided to elevate through a plurality of holes each formed on inner

and outer fixing dies 150 and passive gears 140 to be coaxial with each other. A

notch forming device is installed on a path of traveling a cutting blade material

between feed roller 200 and column 170 to form a notch on the cutting blade material

by pressing member 270's pressing action.

Reference numeral 240 denotes a feed motor for rotating feed driving gear

230. Pressing members 270, fixed cutting member 280 and moving cutting member

290 are elevated by a cylinder member using a fluid or solenoid member.

FIG. 2 is an exploded perspective view of the apparatus for bending a cutting

blade of FIG. 1.

A pair of fixing dies 150 is spaced a given distance away from each other by

a nut spacer or an extra space keeper. A pair of passive gears 140 is provided to the

outside of fixing dies 150 and each rotate by power from respective driving gears

130. Another fixing dies 150 are provided to the outside of driving gears 130 and

passive gears 140 to support respective rotating gears 130 and 140 and prevent them from being disjoined.

The inner and outer fixing dies are assembled by using a coupling means

such as bolts, etc. to be easily removed and joined to each other. Column 170 is

inserted into the circular column insertion hole formed coaxially on the middle of

each fixing die 150 and each passive gear 140. A pair of bending members 180 are

interposed between each hole's inner surface and column 170, and column 170 is

fixedly fitted in the circular insertion hole of each fixing die 150.

A circular groove is provided in the circular insertion hole of fixing die 150.

The circular insertion hole and the circular groove may be provided to a column

stand 300, separated from fixing die 150, and this column stand 300 may be fixedly

fitted into fixing die 150. In this case, fixing die 150 may have a through hole into

which column stand 300 is tightly inserted. Passive gear 140 rotating in mesh with

respective driving gears 130 has cylindrical portion 144 that is hollow in the middle

and inserted into the respective column insertion holes of inner fixing dies 150

having bearings 160.

Key grooves are diametrally provided on the outer surface of upper passive

gear 140, and the inner ends of each key groove communicate with the column

insertion hole. Another key grooves corresponding to the above key grooves are provided on the inner surface of the outermost fixing die 150.

Keys 190, respectively elevating in the key grooves to control the operating

state of the bending members, are always inserted into any one of the key grooves,

and the key grooves formed on the outermost fixing die have a key pressing means

elevating perpendicularly to the key grooves. In this embodiment, preferably, passive

gears 140 and driving gears 130 are spur gears, and in order to increase the torque of

passive gears 140 in mesh with driving gears 130, passive gears 140 are of a train of

reduction gearing larger than driving gears 130 are. If a geared motor is used as a

driving motor, a pitch circle of passive gears 140 can be reduced, thus decreasing the

size of the bending apparatus.

Air cylinder 192 serves as the key pressing means in this preferred

embodiment, and a means using either an electric force such as a solenoid or a

hydraulic pressure such as a hydraulic cylinder, or a means using a mechanical power

may be used. Bending members 180 performing the bending operation while

moving along the surface of column 170 have a groove into which inner ends of each

key 190 are selectively inserted or moved back. Passive gear 140 may additionally

have a boss 142 for pressing the bending members in its cylindrical portion 144.

Column 170 has a slit 172 longitudinally formed on its middle portion serving as a center of rotation of bending members 180 through which a band-shaped

cutting blade material 100 passes, as shown in FIG. 1. As depicted in FIG. 4c, slit

172 has a tapered portion for easily receiving material 100, and a part of column 170

on which the bending operation is carried out has a slant surface in consideration of

the range of the bending operation. Column 170 may be formed of a pair of semi¬

circular columns that can be longitudinally divided into two.

The above bending apparatus can be modified in various shapes. For

example, a plurality of holes 146 and 148 are coaxially formed on passive gears 140

and inner and outer fixing dies 150. Pressing members 270 of the notch cutting

apparatus can freely elevate through these holes, or the apparatus for cutting material

100 can freely elevate therethrough.

FIG. 3 is a perspective view of the elevating state of keys 190 used for

controlling respective bending members 180 to be selectively connected to fixing

dies 150 or passive gears 140. Each key 190 is elastically supported in the key

grooves diametrally formed on passive gear 140, and a portion that is not contacting

an elastic body such as a spring is selectively pressed or released by a key pressing

means, e.g. air cylinder 192's piston rod. As depicted in FIGS. 4a and 4b, as the

piston rod is contracted by air cylinder 192, keys 190 are raised toward the piston rod's contraction by elasticity of an embedded spring, and finally inserted in the key

grooves formed on the inner surface of fixing dies 150. As the piston rod expands,

keys 190 are inserted into the key grooves of passive gear 140. Accordingly, keys

190 each serve as a control member for connecting bending members 180 to fixing

dies 150 or passive gears 140 selectively, moving along bending member 180's

grooves.

FIG. 5 depicts the arrangement of the key grooves according to another

preferred embodiment of the present invention. The smaller an inner angle between

the key grooves or the width of respective bending members 180, the larger a

bending angle becomes.

FIGS. 7a and 7b each depict a notch-cutting device for the inventive

apparatus for bending a cutting blade.

A plurality of blanks are provided on fixing dies 250 for notch cutting to

easily eliminate chips produced by cutting band-shaped cutting blade material 100

from dies 250. A housing of a notch cutting member 260 with a plurality of cutting

blades that can be moved to fixing die 250 is coupled to one surface of fixing die 250

by a coupling means such as a bolt, and elastic bodies like springs are interposed

between the cutting blades and fixing die 250 so as to make the cutting blades return to an original position for the next notching operation.

The following description is about the operation of the inventive cutting

blade bending apparatus.

Cutting blade material 100 to be bent is installed in a state of proceeding

unhindered all over the length of the bending apparatus as shown in FIG. 1.

As depicted in FIG. 6, since cutting blade material 100 is held between a

support roller 205 and a feed roller 200, when feed motor 240 of FIG. 1 is actuated,

feed driving gear 230, connected to feed motor 240's motor shaft, is turned, and feed

gear 220 meshed with feed driving gear 230 is vertically rotated in an opposite

direction. Thus, feed roller 200 integrated with feed gear 220 is rotated, and the

rotating force provided at this point is transferred directly to support roller 205 as

cutting blade material 100 acts as a friction material to rotate support roller 205 in an

opposite direction. Therefore, cutting blade material 100 held between these rollers

205 and 200 is moved forward. If there is a need to form a notch, bending members

180 are not turned even if passive gears 140 are rotating since keys 190 are being

seated in the key grooves of fixing die 150.

Once cutting blade material 100 is fed by the notch cutting device is in its

path, and is put on a given position, each pressing member 270 in FIG. 2 selectively presses the cutting blades of the notch cutting device to form a notch on cutting blade

material 100.

Cutting blade material 100 passes through column 170 and bending

members 180 provided to the inside of passive gear 140's cylindrical portion 144, by

using column 170 and slit 172 of column 170 as a center of rotation. If material 100

reaches a bending position, feed motor 240 stops, and material 100 is not moved

forward any more.

At this point, if keys 190 being seated in the key grooves on outer fixing die

150 are pushed down by air cylinder 192's piston rod (FIG 2), they come to be in the

key grooves of passive gear 140. Since each key 190 has one end that is always in

bending member 180's groove 182, if keys 190 are respectively positioned in fixing

die 150's key grooves, bending members 180 are fixed.

If keys 190 are in passive gear 140's key grooves, passive gears 140 and

bending members 180 are actuated together. As respective driving gears 130

continuously rotate, the inner ends of respective keys 190 are inserted into grooves

182 of FIG. 3, and bending member 180 having the other part of each key 190 being

inserted into the respective key grooves of passive gear 140 is tumed about column

170 to bend material 100. The other bending member 180 that does not bend bending material 100 is not turned even if passive gears 140 continuously rotate,

since keys 19, being respectively seated in fixing die 150's key grooves, are mating

with bending member 180's grooves 182. A friction-reducing member is provided

between the springs and keys 190, and slides contacting the fixing dies during the

passive gears' rotation.

According to the inventive bending apparatus, while one of bending

members 180 rotates to bend material 100, the other one that is not working stays in

an original position. Since keys 190 are in fixing die 150's groove and mating with

bending member 180's grooves 182 as long as air cylinder 192 is not working,

bending member 180 is not actuated during notch forming operation and cutting

operation as well as during bending operation. Boss 142 provided in cylindrical

portion 144 serves to rotate bending members 180 during bending operation, and can

reduce load to the keys during bending operation.

Bending member 180 returns to its original position after the bending

operation by keys 190. Material 100 that was bent is moved forward and fed to a

cutting position as the feed motors are driven again, Once cutting blade material 100

is put on the cutting position, the feeding stops, and the cutting device, including

fixed cutting member 280 and moving cutting member 290, is moved down through holes 149 of fixing dies 150 and holes 148 of respective passive gears 140 and

performs the bending operation.

Holes 149 of respective fixing dies 150 consist of small holes through which

fixed cutting member 280 passes, and large ones through which moving cutting

member 290 is moved during cutting operation. Holes 148, provided to passive gears

140 in order to apply rectilinear moving force to moving cutting member 290,

include holes 149 of fixing dies 150 to prevent fixed cutting member 280 from

colliding with passive gears 140.

Since keys 190 are each seated in fixing die 150's grooves and mate with

bending member 180's grooves 182 during cutting operation, bending members 180

do not rotate even though passive gears 140 are turned.

FIGS. 8a to 8d each depict the processed shape of respective cutting blades

cut by the cutting device. It is preferable that the cutting operation is controlled to be

carried out by the rotation of passive gears 140 by a control device such as a

computer. The detailed description about this matter is in Korean Patent No. 182069

that the present applicant owns.

As described above, in the inventive apparatus for bending a cutting blade,

the bending members are turned by the control members that each selectively couple the bending members to either the fixing members or the driving members only when

the bending operation is carried out, thus enlarging the range of bending operation,

i.e. the bending angle. In case of the cutting blade bending apparatus employing a

pair of bending members, the bending member that does not bend a material is fixed

to the fixing members by the control members, and the other one can work without

hindrance by the bending member that is not working, thereby increasing the bending

angle.

In addition, since the bending member that is not working is not turned even

when forming a notch or cutting a material, the notch forming member, the cutting

member and the bending member can be actuated by the same driving members, thus

making the bending apparatus compact and easily controlling the bending apparatus.

While this invention has been described in connection with what is presently

considered to be the most practical and preferred embodiment, it is to be understood

that the invention is not limited to the disclosed embodiments, but, on the contrary, is

intended to cover various modifications and equivalent arrangements included within

the spirit and scope of the appended claims

Claims

WHAT IS CLAIMED IS:

1. An apparatus for bending a cutting blade material comprising:

fixing members;

a column having a slit into which a cutting blade material is inserted and

fixed to the fixing members;

bending members turned about the column's central shaft and performing a

bending operation;

driving members rotating the bending members about the column's central

shaft; and

control members each selectively connecting the bending members to the

driving members or the fixing members, or disjoining the bending members from the

driving members or the fixing members.

2. An apparatus according to claim 1, wherein the number of the bending

members is two so as to carry out clockwise and counterclockwise bending operation,

and one of them is connected to the driving members by the control members for the

bending operation while the other one is joined to the fixing members by the control

members not to perform a relative movement with respect to the fixing members.

3. An apparatus according to claim 1 or 2, wherein the driving members are

passive gears driven by a motor, and the passive gears are rotatably provided to the

fixing members with bearings interposed therebetween so as to have the same center

as the column's and have grooves formed diametrally and receiving the control

members to actuate the control members and the bending members together during

the bending operation.

4. An apparatus according to claim 3, wherein the passive gears have a boss in

an inner surface of its middle.

5. An apparatus according to claim 1 or 2, further comprising a feed part for

feeding a cutting blade material.

6. An apparatus according to claim 5, wherein the feed part includes a feed

roller tumed by a feed gear and a support roller supporting the cutting blade material.

7. An apparatus according to claim 1 or 2, further comprising a notch forming part forming a notch on the cutting blade material by the driving members' rotation.

8. An apparatus according to claim 7, wherein the notch forming part includes a

pressing member moved up and down through holes provided to the respective fixing

members and driving members, fixing dies supporting the cutting blade material

when forming a notch thereon, and a notch cutting member pressed by the pressing

member.

9. An apparatus according to claim 1 or 2, further comprising a cutting part for

cutting the cutting blade material by the rotation of the driving members.

10. An apparatus according to claim 9, wherein the cutting part includes a fixed

cutting member moved up and down through the holes provided to the respective

fixing members and driving members, and fixed during cutting operation, and a

moving cutting member rotating along with the driving members during the cutting

operation.