WO1998053718A1

WO1998053718A1 - Grinding machine for processing side surface of footwear sole

Info

Publication number: WO1998053718A1
Application number: PCT/KR1998/000014
Authority: WO
Inventors: Jaeduck Kang; Youngho Cho
Original assignee: Jaeduck Kang; Youngho Cho
Priority date: 1997-05-30
Filing date: 1998-01-23
Publication date: 1998-12-03
Also published as: KR100198890B1; KR970073425A; ID20390A; TW352333B

Abstract

A grinding machine for processing a side surface of a footwear sole including: an acting unit (1) which secures and rotates a phylon sheet (S) and transfers the side surface of the phylon sheet (S) to correspond with a sample; a cutting angle adjusting unit (2) which is engaged with the acting unit and adjusts a cutting angle of a cutting surface (9a); a plate elevation adjusting unit (3) which is engaged with the acting unit and the cutting angle adjusting unit and adjusts upper and lower cutting widths of the cutting surface; a cutting unit (4) which is engaged with the cutting angle adjusting unit and the plate elevation adjusting unit (3) and is ascended at the time when a cutter (45) is in an angle movement forwardly and backwardly to directly perform a cutting operation; and a vibroisolating unit (5) for preventing powder dust generated when grinding a midsole (9) from being splashed.

Description

TITLE OF THE INVENTION

GRINDING MACHINE FOR PROCESSING SIDE SURFACE OF FOOTWEAR SOLE

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a grinding machine for processing a

side surface of a footwear sole. More particularly, the present invention

relates to a grinding machine for processing a side surface of a midsole in

various shapes, before the midsole of a phylon material is compressed under a

pressing process, and for executing a greatly difficult work process in an

ease and rapid manner, to thereby produce a great large number of midsoles in

a low production cost.

Discussion of the Prior Art

Generally, a footwear sole is classified into an outsole and a midsole.

The midsole is made of phylon, or bubbling polyurethane or polyethylene, and

the outsole is made of a rubber(including a synthetic rubber).

Meanwhile, in specific cases, the footwear sole is used, without

separated into the outsole and the midsole.

A typical footwear sole is constructed by using two representative methods. In a first method, the midsole and the outsole are separately

manufactured, and then they are bonded with each other by using an adhesive

material. Alterna ively, in a second method, after the outsole in a soft or

non-soft state which covers the adhesive material on the upper surface

thereof is inserted into a molding machine, an appropriate amount of bubbling

polyurethane is poured into the molding machine. Then, the heat and pressure

is applied to the molding machine, to thereby bond the bubbled polyurethane,

that is, the midsole and outsole, as a unitary body.

As a modified method in the second method, after a completed midsole is

inserted into the molding machine into which the outsole is put, the heat and

pressure is applied, to thereby bond the midsole and the outsole as a unitary

body. Since the rubber material of outsole has a good quality of molding

feature, there occurs no specific problem in performing a sophisticated

processing work, but a phylon material of midsole should require an

additional intermediate processing step to complete the formation of the

midsole. Accordingly, the midsole is processed to match the shape of the

outsole in the intermediate processing step (before the pressing process),

which is achieved by the following method.

Firstly, a processed line(the line according to the shape of the outsole) is formed on the phylon sheet by using a gauge, and the whole of the

edges along the processed line is grinded manually.

Of course, the midsole which completes the grinding operation becomes

under the pressing process, to thereby be produced as a completed sole.

In the grinding method by manual work, however, there are several

disadvantages in that the quality of the product is substantially

deteriorated and the cutting angle and width for the pressing molding are not

relatively precise and consistent. Moreover, there occur problems that

the work efficiency is low and the occurrence frequency of bad products is

high, to thereby reduce the production yield.

To solve these problems, there is presented an automatic grinding

machine which is capable of easily performing the grinding operation.

However, the automatic grinding machine only exhibits many disadvantages as

follows. Firstly, since a conventional grinding machine has a fixed

cutter which can not adjust an angle, the edge(outer periphery) of the

midsole is not grinded in a three-dimensional manner.

For instance, the midsole forms an arch portion with which the concave

portion of the sole of a foot is in contact. In this case, it is natural that

the left and right side angles of the arch portion should be different from each other. However, since the conventional grinding machine has the

fixed cutter, the left and right side angles of the arch portion are not

really different. Accordingly, there exists a problem that the arch

portion should be completed in the manual work process.

Further, the conventional grinding machine is not suitable to the

midsole which requires different grinding angles and widths.

Secondly, the conventional grinding machine has a structural

disadvantage in that the whole edge of the midsole can not rotated by about

360° , when the midsole is processed. In other words, the half of the

midsole is firstly processed in a rotated state by about 180^° and the

remaining half is then processed. Therefore, it can be known that the

product efficiency is low and the preciseness of the grinding state is

deteriorated. Further, the conventional grinding machine has a

complicated structure and can not produce a precise midsole.

And since the cutter is comprised of stone, the abrasion of the cutter

is easily generated and the grinding preciseness is accordingly decreased.

Moreover, since the cutter is replaced with a new cutter, whenever required,

there occur problems that cost consumption is increased and the damage of the

cutter is easily generated due to a low impact resistance. Additionally, in the conventional grinding machine, since the cutter

can not adjust the cutting speed according to cutting quantity, there are

disadvantages that the grinding preciseness is deteriorated and the

production efficiency is low.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a grinding machine for

processing the side surface of a midsole in various shapes, before the

midsole of phylon material is compressed under a pressing process, and for

executing a greatly difficult work process in an ease and rapid manner, to

thereby produce a great number of midsoles in a low production cost.

To achieve this and other objects according to the present invention,

there is provided a grinding machine for processing a side surface of a

footwear sole comprising: an acting unit which secures and rotates a phylon

sheet and transfers a side surface of the phylon sheet to be correspond with

a sample; a cutting angle adjusting unit which is engaged with the acting

unit and adjusts a cutting angle of a cutting surface; a plate elevation

adjusting unit which is engaged with the acting unit and the cutting angle

adjusting unit and adjusts upper and lower cutting widths of the cutting

surface; a cutting unit which is engaged with the cutting angle adjusting unit and the plate elevation adjusting unit and is ascended at the time when

a cutter is in an angle movement forwardly and backwardly to directly perform

a cutting operation; and a vibroisolating unit for preventing powder dust

generated when grinding a midsole from being splashed.

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects and aspects of the invention will become apparent from

the following description of embodiments with reference to the accompanying

drawings in which:

FIG. 1 is a schematic top view illustrating a grinding machine for

processing a side surface of a footwear sole according to the present

invention;

FIG. 2 is a schematic plan view illustrating a grinding machine for

processing a side surface of a footwear sole according to the present

invention;

FIG. 3 is a schematic bottom view illustrating a grinding machine for

processing a side surface of a footwear sole according to the present

invention;

FIG. 4 is a sectional view illustrating an acting unit embodied

according to the present invention; FIG. 5 is a sectional view illustrating a holder within- an acting unit

of FIG. 4;

FIG. 6 is a side view illustrating a cutting angle adjusting unit

embodied according to the present invention;

FIG. 7 is a sectional view illustrating a cam within the cutting angle

adjusting unit of FIG. 6;

FIG. 8 is a sectional view illustrating a roller and parts related

therewith within the cutting angle adjusting unit of FIG. 6;

FIG. 9 is a sectional view illustrating a plate elevation adjusting

unit embodied according to the present invention;

FIG. 10 is a side view illustrating a cutting unit embodied according

to the present invention;

FIGS. 11 and 12 are views illustrating a cutter and its using state

embodied according to the present invention;

FIG. 13 is an exploded perspective view illustrating a midsole working

jig embodied according to the present invention;

FIG. 14 is a perspective view illustrating a midsole which is produced

by a grinding machine embodied according to the present invention;

FTG. 15 is a VIP i 1 lustrat inσ a usinσ statp nf a vihrnisnlat inσ unit embodied according to the present invention;

FIGS. 16 and 17 are sectional and part perspective views illustrating a

cam manufacturing method embodied according to the present invention: and

FIG. 18 is a sectional view illustrating an embodiment of an acting

unit embodied according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, an explanation on the construction and operation of the

grinding machine for processing a side surface of a footwear sole embodied

according to the present invention will be in detail discussed with reference

to accompanying drawings. Referring to FIGS. 1 to 3, there is provided a

grinding machine for processing a side surface of a footwear sole comprising:

an acting unit 1 which secures and rotates a phylon sheet S and transfers the

side surface of the phylon sheet S to be correspond with a sample; a cutting

angle adjusting unit 2 which is engaged with the acting unit 1 and adjusts a

cutting angle of a cutting surface 9a; a plate elevation adjusting unit 3

which is engaged with the acting unit 1 and the cutting angle adjusting unit

2 and adjusts upper and lower cutting widths of the cutting surface 9a; a

cutting unit 4 which is engaged with the cutting angle adjusting unit 2 and the plate elevation adjusting unit 3 and is ascended at the time when a

cutter 45 is in an angle movement forwardly and backwardly to directly

perform a cutting operation; and a vibroisolating unit 5 for preventing

powder dust generated when grinding a midsole 9 from being splashed..

The acting unit 1, as shown in FIG. 4, is assembled to a housing 15

which is movable on a sliding shaft 11, and a bracket 12 is installed on the

housing 15. A shaft 13 is installed on the bracket 12 and a working jig 14 is

coupled on the shaft 13. A spiral gear 8 formed on the bottom surface of

the shaft 13 is engaged with a spiral gear 8' of the housing 15 which is

coupled with the sliding shaft 11. A timing pulley 6 is coupled on the

opposite side of the housing 15 and is connected to a driving shaft of a

motor M by means of a timing belt 61. The driving force of the motor M is

obtained by rotating the shaft 13 which is connected to the sliding shaft 11

to thus rotate the working jig 14 on the shaft 13.

The working jig 14 is comprised of a gripping table 14a and a guide

table 14b, which have the same shapes. Also, the gripping table 14a and the

guide table 14b have the same shape and standard as the outer periphery of a

midsole 9. The phylon sheet S to be processed is attached on the gripping

table 14a, and the outer peripheral surface of the guide table 14b is in contact with a guide roller 17. A plurality of needles 14c are installed

in all directions on the upper surface of the gripping table 14a of the

working jig 14, to thereby secure in a stabilized state the phylon sheet S to

be molded. A stress bed 72 is positioned on the upper portion of the gripping

table 14a and presses the phylon sheet S disposed on the gripping table 14a.

The stress bed 72 is installed on an air cylinder 71, and the bracket

12 in which the air cylinder 71 is formed is movable forwardly and backwardly

along a slide rail 12a on the upper surface of a horizontal frame B.

The housing 15 is connected to a piston rod of an air cylinder 15a on

the bottom surface thereof, and if the air cylinder 15a operates, the housing

15 and the bracket 12 are pulled, to thereby contact the outer peripheral

surface of the guide table 14b of the working jig 14 to the guide roller 17.

The guide roller 17 is installed on a holder 18 and is screw-coupled to

a reed gear 19 on the rear end thereof. The reed gear 19 is engaged with a

transmission gear 19a, and the transmission gear 19a is engaged with an

adjusting gear 19b which is coupled on a shaft 16. The shaft 16 is installed

on the horizontal frame B and is coupled with an adjusting handle 16a on the

end thereof. On the other hand, the cutting angle adjusting unit 2 serves

to adjust and determine the inclining angle of the cutting surface 9a of the midsole 9. In construction, a cam flange 23 on which a cam 23a for

guiding an inclined degree of the cutting surface 9a is assembled is coupled

on a shaft 22. The shaft 22 is installed on the horizontal frame B. and a

spiral gear 8a which is coupled on the lower end of the shaft 22 is connected

to a spiral gear 8b on a horizontal shaft 21. A timing pulley 6a is assembled

with an opposite side of the spiral gear 8b and is connected to a motor 42 by

means of a timing belt. The timing pulleys 6 and 6a on the sliding shaft

11 and the horizontal shaft 21 are designed to have the same rotational

ratio, to thereby make the rotational ratio of the working jig 14 and the cam

23a substantially same. Thus, the inclined degree of the cutter 45 is

adjusted in accordance with the rotation of the cam 23a, such that the cutter

45 is placed at a desired position and angle on the phylon sheet S.

Meanwhile, the cam 23a is in contact with a cam roller 24 which is

assembled on a holder 25, and a rack gear 26 of the holder 25 is engaged with

a spur gear 26a. The spur gear 26a is engaged with another spur gear 27a on

the same shaft, and the spur gear 27a is engaged with a rack gear 27 which is

assembled with a link bracket 29 on the end portion thereof.

Each of the rational ratios of the rack gear 26 to the spur gear 26a

and of the rack gear 27 to the spur gear 27a is 1 : 3, and for the purpose of compacting the size of the system, it is preferable that the forward and

backward moving distance of the holder 25 moving along the orbit of the

peripheral surface of the cam 23a is transmitted to the link bracket 31 in

the ratio of 1 : 3. The rack gear 26 and the spur gear 26a and the

rack gear 27 and the spur gear 27a are installed in an additional housing,

and the link 29 and the link bracket 31 are connected to the rear end of the

rack gear 27 in an angle-moveable state. The rear end of the holder 25 is

formed as an inclined surface 25a, and an adjusting handle 25b which has an

inclined surface 25c on the lower end thereof is formed on the perpendicular

direction to the inclined surface 25a. At the time, the inclined surfaces 25a

and 25c are in surface-contact with each other.

If the adjusting handle 25b operates, the holder 25 moves forwardly and

backwardly, such that the contacted distance of the cam roller 24 with the

cam 23a is adjusted to thereby adjust the movement angle of the link bracket

29. Accordingly, the midsole 9 can be processed with the single cam 23a

irrespective of a variety of sizes thereof. The cutting unit 4 is

installed on the link bracket 31 and is comprised of a plate 41 on which the

link bracket 31 is coupled. A motor 42 is installed on the plate 41 and

is connected with pulleys 43 and 46 of the cutter 45 by means of a belt 44. The cutter 45 takes a form of a circular cone having a large portion and a

small lower portion. At the time, it is desirable that the rotational

speed of the cutter 45 should be freely adjusted by using a direct current

motor as the motor 42. The cutter 45 is manufactured by a tool steel, and

a plurality of cutting edges 45a are formed by a constant interval in all

directions on the whole outer peripheral surface of the cutter 45. As a

result, powder dust(minute scrap) generated when grinding the phylon sheet S

is not accumulated on the outer peripheral surface of the cutter 45.

The plate elevation adjusting unit 3 is installed on the both sides of

the plate 41. The plate elevation adjusting unit 3 is comprised of a

cutting means installing bracket 34 on which the plate 41 is assembled. The

cutting means installing bracket 34 is coupled by means of a pin 33 on the

upper end of an elevating shaft 32 and is angle-movable. The elevating shaft

32 is mounted ascendably on an elevating hole 37 of the bracket 31 on the

horizontal frame B and is coupled to a guide roller 32a on the lower end

thereof. The guide roller 32a is in contact with a "Z" cam 36 which is

assembled on a cam shaft 35, and the "Z" cam 36 is protruded on the outer

peripheral surface thereof and serves to regularly elevate the elevating

shaft 32. On the rear end of the cam shaft 35 on which the "Z" cam 36 is assembled, is coupled a timing pulley and is connected to a motor M by means

of a timing belt. An elevation nut 38 is formed on the elevating shaft 32

and adjusts an elevating length of the elevating shaft 32 in accordance with

the size of the midsole 9. On the other hand. FIGS. 16 and 17 show a

processing work state of the cam 23a. A circular type of cam material C is

coupled on the cam flange 23, and then the cam flange 23 is rotated. A

working material holder 28 on which a working material 28a for displaying the

orbit of the cam on the cam material C is installed is associated on the

holder 25. Next, the completed midsole 9 is coupled to the gripping table

14a and the cutter 45 is guided along the cutting surface 9a of the midsole

9. As a result, the cutting angle of the plate 41, on which the cutter 45

is installed, is varied and the variable degree of the plate 41 is

transmitted through the link bracket 29 and the rack gear 27, the spur gear

27a, the rack gear 26, the spur gear 26a which are connected to the bracket

31 to the holders 25 and 18, to thereby guide the working material holder 28.

The working material 28a of the working material holder 28 displays the

orbit of the cam 23a on the cam material C of the cam flange 23, which is in

contact with the roller 24, along the cutting surface 9a of the completed

midsole 9. Thus, the manufacturing of the cam 23a is achieved. To prevent the powder dust generated when grinding the midsole 9 from

being splashed, there is provided a vibroisolat ing unit 5, which is comprised

of an absorption duct 52 which is installed on the rear portion of the cutter

45 of the cutting unit 4 and an air injection nozzle 53 which is formed on

the upper portion thereof and blows the power dust to the absorption duct 52.

Further, an air injection nozzle 54 is installed on the front side of

the horizontal frame B and blows the powder dust to the absorption duct 52,

to thereby prevent the powder dust from being splashed to the exterior.

Additionally, a vibroisolat ing panel 51 is installed on the top surface

and left and right sides of the horizontal frame B, respectively and blows

the powder dust to the absorption duct 52, to thereby prevent the powder dust

from being splashed to the exterior. Under the construction as the above,

after the working «jig 14 is selected in accordance with the size and shape of

the midsole 9 to be processed, the phylon sheet S is secured on the gripping

table 14a. In this working state, an operator can produce a precise product

in an ease manner. The working jig 14 is assembled on the shaft 13 of the

acting unit 1, and the cam 23a, which guides a cutting angle corresponding to

the shape of the outer peripheral surface of the midsole 9 and the angle of

the cutting surface 9a, is coupled to the cam flange 23 of the cutting angle adjusting unit 2. Under the above state, the outer peripheral surface of

the phylon sheet S is mounted to correspond with the outer peripheral surface

of the gripping table 14a. on the gripping table 14a.

At the time, the phylon sheet S is stably secured by the plurality of

needles 14c on the upper surface of the gripping table 14a, and the stress

bed 72, which is descended by the operation of the air cylinder 71, is in

contact with the upper surface of the phylon sheet S, to thereby prevent the

phylon sheet S from being moved. Of course, during the above process, the

operator turns the adjusting handle 16a and rotates the reed gear 19 which is

engaged with the adjusting gear 19b and the transmission gear 19a, to thereby

rotate the holder 18 which is screw-coupled to the reed gear 19 in the

forward/backward directions.. As a result, since the interval of the

guide table 14b which is in contact with the guide roller 17 is adjusted, a

working. start ing point of the phylon sheet S is adjustable in accordance with

the size of the midsole 9. The guide table 14b is in contact with the

guide roller 17 on the rear side thereof, and the phylon sheet S which is

coupled to the gripping table 14a is in contact with the cutter 45. Then, if

the motor M is driven, the sliding shaft 11 of the acting unit which is

connected to the motor M and the timing pulley 6 via the timing belt 61, the horizontal shaft 21 of the cutting angle adjusting unit 2, and the cam shaft

35 are rotated in the same rotational ratio.

Accordingly, the guide table 14b of the working jig 14 which is

assembled on the shaft 13 rotates by about 360° and is simultaneously moved

in the forward and backward directions along the slide rail 12a, while being

contacted with the guide roller 17. At the time, the gripping table 14a

is slid forwardly and backwardly, while rotating by about 360^° , and the

phylon sheet S secured on the gripping table 14a is grinded on the outer

peripheral surface thereof by means of the cutter 45.

The above working process is possible because the shaft 13 rotating the

working jig 14 and the housing 15 on the lower end of the bracket 12 which is

connected to the shaft 13 are always pulled in the baclcward direction by the

air cylinder 15a, to thereby contact the guide table 14b with the guide

roller 17 under the rotation of the shaft 13 and to allow the bracket 12 to

be slid along the slide rail 12a forwardly and backwardly.

Accordingly, the phylon sheet S secured on the gripping table 14a is

guided by the guide table 14b which is contacted with the guide roller 17 and

is grinded by the cutter 45. The cutting angle of the midsole 9 which is

processed in the state of being secured on the gripping table 14a is adjusted and determined by the cutting angle adjusting unit 2. The operation of the

cutting angle adjusting unit 2 will be discussed hereinafter.

The phylon sheet S secured on the gripping table 14a is grinded by the

cutter 45 and simultaneously the cam 23a,- which is assembled on the cam

flange 23 on the shaft 22 connected to the horizontal shaft 21 of the cutting

angle adjusting unit 2, is rotated. The roller 24 which is in contact

with the cam 23a moves the rack gear 26 forwardly and backwardly, while the

holder 25 is slid forwardly and backwardly along the outer peripheral surface

of the cam 23a. As a result, the spur gear 26a is rotated forwardly and

reversely, and the forward and reverse rotation force of the spur gear 26a is

transmitted to the spur gear 27a, to thereby move the rack gear 27 forwardly

and backwardly. Of course, each rotation ratio of the rack gear 26 to the

spur gear 26a and the rack gear 27 to the spur gear 27a is 1 : 3.

At the time, assuming that the moving width of the holder 25 to which

the roller 24 is coupled is "1", the width of the link bracket 31 which is

connected to the rack gear 27 is "3", to thereby angle-move the plate 41

which is connected to the link bracket 29. As a result, the cutter 45 on

the plate 41 is in the angle movement, to thereby grind the outer peripheral

surface of the phylon sheet S which is secured on the gripping table 14a at an accurate cutting angle. The processing width of the cutting surface 9a

of the cutting angle adjusting unit 2 is adjusted by the following process.

As the elevating shaft 32 to which the guide roller 32a contacted with

the "Z" cam 36 is coupled is elevated, the cutting means installing bracket

34 which is associated to be angle-movable is ascended on the basis of the

pin 33. Next, the plate 41 which is associated on the cutting means

installing bracket 34 is elevated, and the upper and lower grinding interval

between the cutter 45 an the phylon sheet S is adjustable, to thereby adjust

the upper and lower grinding width of the cutting surface 9a.

Accordingly, the cutter 45 is ascended by the elevating operation of

the elevating shaft 32, and simultaneously the angle adjustment of the

cutting surface 9a is achieved by the cam 23a, to thereby perform the

grinding operation of the cutting surface 9a. In other words, one midsole

of the left and right midsoles is completed. On the other hand, if the

processing of another midsole 9 is executed, the working jig 14 is simply

turned over and the same working process as mentioned in the above is

applied. In more details, after the working jig 14 is separated from the

shaft 13, the gripping table 14a is disposed at the lower portion and the

guide table 14b is disposed at the upper portion. Then, if the overturned working jig 14 is coupled on the shaft 13, the shapes of the guide table 14b

and the gripping table 14a of the working jig 14 are in a reverse direction

to that upon the first process. At the time, the cam 23a is assembled in

a reverse order to adjust the angle of the cutting surface 9a. but since the

shape of the cutting surface 9a is formed in the left and right symmetrical

directions and the angle of the cutting surface 9a is the same, the reverse

order of assembly of the cam 23a does not matter.

In other words, if the starting point of the gripping table 14a which

is guided by the guide roller 17 corresponds to the starting point of the cam

23a, the reverse order of assembly of the cam 23a is not required.

Meanwhile, the holder 25, which adjusts the angle of the cutting

surface 9a, while being contact with the cam 23a, rotates the adjusting

handle 25b, to thereby move the holder 18 forwardly and backwardly.

Since the operating distance of the roller 24 which is in contact with

the cam 23a is adjusted, the moving distance of the link bracket 31 is

adjusted and the angle of the cutting surface 9a is appropriately adjustable

in accordance with the size of the midsole 9. Hence, the operator does

not have various cams 23a according to the size of the midsole 9, and with

the simple operation as mentioned above, the midsole 9 can be grinded. The vibroisolat ing unit 5 serves to all absorb the powder dust

generated during the grinding operation to the absorption duct 52. to thereby

maintain a clean working environment and prevent the pollution of

surroundings due to the powder dust. FIG. 18 shows the acting unit which

secures the midsole 9 on the gripping table 14a by the vacuum state, without

installing the needles on the gripping table 14a.

Referring to FIG. 18, a hole 81 is formed on the center portion of the

gripping table 14a, and an inclined surface 80 which is inwardly inclined is

formed towards the hole 81. Then, a hole 90, which is opened on the upper

portion thereof, is formed on the center portion of the shaft 13, and a

plurality of holes 91 which are crossed perpendicularly to the hole 90 are

formed on the lower portion of the hole 90. Next, the upper end of the shaft

13 is inserted into the* hole 80 of the working jig 14 and secured by means of

a key or set bolt, and then a hole 301 is formed on a bearing casing 300 of

the bracket 12. A flexible hose 130 is connected to the hole 301 and is also

connected to a connection hose 120 which is connected to a solenoid valve

100. A connection hose 111 which is connected to a blower 110 is connected to

the solenoid valve 100. It is of course natural that a sealing technique

is adapted to the interior of the bearing casing 300, to keep the closing of the bearing casing 300, and a silencer 101 is preferably attached on the

solenoid valve 100. Under the construction as the above, the midsole 9

can be accurately secured on the gripping table 14a. without installing the

needles on the gripping table 14a. Accordingly, since the marks made by

the needles are not formed on the midsole 9, the quality of product can be

improved, and further since the midsole is preserved without any flaw or

scar, the durability of the product can be ensured.

If the blower 110 operates, the solenoid valve 100 is simultaneously

operated to connect the upper and lower connection hoses 120 and 111.

Thereby, the air remaining within the holes 81 and 91 on the shaft 13 of the

working jig 14 and flexible hose 130 is discharged to the exterior.

Accordingly, the whole hose lines are in the vacuum state, and the

midsole 9 on the upper surface of the gripping table 14a is absorbed toward

the hole 81 and is solidly contacted with the inclined surface 80 of the

gripping table 14a. Since the following working process is the same as

the above, an explanation thereon will be avoided for the brevity of

description of the present invention. The structure as mentioned above

removes the needles on the gripping table 14a, to thereby improve the quality

of midsole and the durability thereof. In addition, there is an advantage that the stress bed 72 for stressing the midsole 9 from the upper portion to

the lower portion is not required, when the midsole 9 is grinded by the

cutter 45. In other words, the position of the midsole 9 can be stably

secured to grind the side surface of the midsole 9, without adap ing the

stress bed 72 and the air cylinder 71. Therefore, since the intereference

of the grinding operation caused due to the stress bed and the peripheral

devices is not generated, various functions, such as the angle adjusting

function of the cutter, the rotation function of about 360^° of the working

jig, the width adjusting function of the cutting surface, the cutting angle

adjusting function and so on, can be executed, such that more precise

products as well as a great variety of products can be presented.

Further, the problem that the cutter is contacted with the peripheral

devices can be solved, such that the durability of the cutter may be

improved. As apparent from the foregoing, there is provided a grinding

machine for processing a side surface of a footwear sole, in which since the

angle adjustment of a cutter is freely made, the different left and right

angles of midsole can be processed, and since the edges of the midsole are

rotated by about 360° , the midsole can be precisely grinded. Further, in the

grinding machine according to the present invention, the grinding width adjustment of a cutting surface can be easily made and the durability of the

cutter can be considerably improved. Therefore, if the material to be

processed is inserted and a simple manipulation is then executed, the midsole

can be precisely produced in a rapid manner. As compared with the

conventional grinding machine, the grinding machine according to the present

invention ensures improved cost saving and productivity and decreases the

occurrence ratio of bad products, to thereby produce a precise degree of

midsole on a large scale. Although a preferred form of the invention has

been described, it will be understood by those skilled in the field that

variations therefrom, and analogous uses, are within the Imowledge of those

skilled in the art. Accordingly, it is intended that the scope of the

invention be defined, not by the scope of the foregoing description, but

_* rather by the scope ot the claims as interpreted in view of the pertinent

prior art.

Claims

What Is Claims Is :

1. A grinding machine for processing a side surface of a footwear sole,

said machine comprising:

an acting unit for securing and rotating a phylon sheet to transfer a

side surface of said phylon sheet to be correspond with a sample;

a cutting angle adjusting unit engaged with said acting unit, for

adjusting a cutting angle of a cutting surface;

a plate elevation adjusting unit engaged with said acting*unit and said

cutting angle adjusting unit, for adjusting upper and lower cutting widths of

said cutting surface;

a cutting unit engaged with said cutting angle adjusting unit and said

plate elevation adjusting unit and ascended at the time when a cutter is in

an angle movement forwardly and backwardly to directly perform a cutting

operation; and a vibroisolat ing unit for preventing powder dust generated when

grinding a midsole from being splashed.

2. The grinding machine as claimed in claim 1, wherein said acting unit

is comprised of: a first shaft installed on a bracket which is slid forwardly

and backwardly along a slide rail on the upper surface of a horizontal frame:

a first spiral gear formed on the bottom surface of said shaft and engaged

with a second spiral gear of a housing which is coupled with said sliding

shaft; a timing pulley coupled on the opposite side of said housing and

connected to a motor by means of a timing belt; a lower air cylinder for

pulling backwardly said housing; a working jig installed on said first shaft

and guided by a guide roller; a holder coupled to said guide roller and

screw-coupled to a reed gear to be engaged with an adjusting gear and a

transmission gear of a second shaft, to thereby adjust the interval between

said working jig and said guide roller; and a stress bed coupled on the lower

end of said air cylinder, for stressing said phylon sheet on the upper side

of said working jig, said air cylinder installed on a cylinder installing bar

of a setting bracket.

3. The grinding machine as claimed in claim 1, wherein said acting unit

is comprised of: a first hole formed on the center portion of a gripping table of a working jig: an inclined surface inwardly inclined towards said

first hole: a second hole opened on the upper portion thereof and formed on

the center portion of a shaft, said shaft being inserted into said first hole

of said working jig on the upper end thereof and secured by means of a key or

set bolt; a plurality of third holes crossed perpendicularly to said second

hole and formed on the lower portion of said second hole; a fourth hole

formed on a bearing casing of a bracket; a flexible hose connected to said

fourth hole and also connected to a first connection hose which is connected

to a solenoid valve; and a second connection hose which is coupled to a

blower connected to said solenoid valve.

4. The grinding machine as claimed in claim 1, wherein said cutting

angle adjusting unit is comprised of: a cam flange on which a cam is

assembled, coupled on a shaft; a timing pulley assembled on said shaft and

connected to a horizontal shaft which is connected to a motor by means of a

timing belt, said shaft and horizontal shaft being engaged with first and

second spiral gears, a holder on which a cam roller is associated, being

contact with said cam; a first rack gear of said holder for sliding forwardly

and backwardly a second rack gear which is engaged with a second spur gear on

the same shaft as a first spur gear which is engaged with said first rack gear; and a link bracket connected to the one end of said second rack gear by

means of a link, to thereby angle-move said cutting unit installed on said

1 ink bracket .

5. The grinding machine as claimed in claim 1, wherein said plate

elevation adjusting unit is comprised of: a "Z" cam assembled on a cam shaft

which is coupled a timing pulley and is connected to a motor by means of a

timing belt and being contacted with a guide roller on the lower end of an

elevating shaft, for elevating said elevating shaft which is installed on a

bracket of a horizontal frame; a cutting means installing bracket on which

said cutting unit is associated, coupled by means of a pin on the upper end

of said elevating shaft, to thereby angle-move said cutting unit; and an

elevation nut formed on said elevating shaft, for adjusting an elevating

height of said elevating shaft.

6. The grinding -machine as claimed in claim 1, wherein said cutting

unit is comprised of: a plate on which said link bracket of said cutting

angle adjusting unit is associated and installed between said cutting means

installing bracket on both sides of said cutting unit; a motor installed on

said plate; and said cutter engaged with said motor.

7. The grinding machine as claimed in claim 1, wherein said vibroisolat ing unit is comprised of: a vibroisolat ing panel installed on said

horizontal frame, for preventing said powder dust from being splashed; an

absorption duct installed on the rear portion of said cutter, for absorbing

the powder dust: and first and second air injection nozzles formed on the

front and back sides of said horizontal frame.

8. The grinding machine as claimed in claim 2, wherein said working jig

is comprised of: a gripping table and a guide table which are installed

separatedly on said first shaft of said acting unit and have the same shape

and standard as the outer periphery of said midsole, said gripping table

securing said phylon sheet and being engaged with said cutter of said cutting

unit, said guide table being in contact with said guide roller, and said

gripping table and said guide table having a plurality of needles which are

installed on the outer surface thereof, for securing in a stabilized state

said phylon sheet.

9. The grinding machine as claimed in claim 4, wherein said holder

forms a first inclined surface on the rear end thereof and couples an

adjusting handle which has a second surface on the lower end thereof to said

first inclined surface, whereby said holder operates forwardly and backwardly

by the elevating adjustment of said adjusting handle, to thereby adjust a contact interval between said cam roller associated to said holer and said

cam and to further adjust a cutting angle of said cutting surface in

accordance with the size of said midsole.

10. The grinding machine as claimed in claim 5, wherein said cutter

instal ed on said cutting unit takes a form of a circular cone having a large

portion and a small lower portion and forms a plurality of cutting edges by a

constant interval in all directions on the whole outer peripheral surface

thereof, to thereby prevent scraps from said phylon sheet from being attached

on the outer peripheral surface thereof.

11. The grinding machine as claimed in claim 4, wherein said holder is

coupled to a working material holder on which a working material is

associated, said cam flange of said shaft coupled to a circular type of cam

material thereon, to thereby a completed midsole on said gripping table of

said working jig and to be forcibly guided by said cutter of said cutting

unit, whereby said working material of said working material holder installed

on said holder by the forward and backward operations of said holder

processes an orbit of said cam material along said cutting surface of the

completed midsole on said cam material.