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Title:
APPARATUS FOR SEPARATING CUTTING GAP OF METAL PLATE
Document Type and Number:
WIPO Patent Application WO/2009/005262
Kind Code:
A1
Abstract:
An apparatus for separating cutting gap of metal plate adopted by a cutting machine including a circular saw (12) for cutting a metal plate (2) fixed on a frame (10), the apparatus comprising: a wedge (21) whose front end inserts into a cutting gap (2a) generated by the circular saw (12) cutting the metal plate; a guide (31) for guiding the wedge (21) to move in line with the cutting gap (2a); and hitting means (41) installed on the frame (10) intermittently hitting a rear end of the wedge (21) to insert into the cutting gap (2a).

Inventors:
LEE HAN-KEUN (KR)
LEE DONG-GYU (KR)
Application Number:
PCT/KR2008/003748
Publication Date:
January 08, 2009
Filing Date:
June 27, 2008
Export Citation:
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Assignee:
SINJIN SM CO LTD (KR)
LEE HAN-KEUN (KR)
LEE DONG-GYU (KR)
International Classes:
B23D47/00
Foreign References:
KR840007208A1984-12-06
KR20050011021A2005-01-29
JPH01109017A1989-04-26
Attorney, Agent or Firm:
LEE, Sang-Yong (1572-12Seocho-dong, Seocho-gu, Seoul 137-874, KR)
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Claims:

Claims

[1] An apparatus for separating cutting gap of metal plate adopted by a cutting machine including a circular saw for cutting a metal plate, the apparatus comprising: a wedge whose front end inserts into a cutting gap generated by the circular saw cutting the metal plate; and hitting means intermittently hitting a rear end of the wedge to insert into the cutting gap. [2] The apparatus according to claim 1, wherein the wedge inserts into the cutting gap in the horizontal direction, from the top or bottom. [3] The apparatus according to claim 2, further comprising a guide for guiding the wedge to move in line with the cutting gap; and a rod extending from the wedge which is guided by the guide. [4] The apparatus according to claim 1, further comprising a transfer cylinder for moving the wedge and the hitting means in the direction in which the cutting gap is widened. [5] The apparatus according to one of claims 1 through 4, further comprising a pressing cylinder continuously pressing the wedge into the cutting gap, and wherein the hitting means hit a rear end of the pressing cylinder. [6] The apparatus according to claim 5, wherein the pressing cylinder is a dual rod typed cylinder.

Description:

Description

APPARATUS FOR SEPARATING CUTTING GAP OF METAL

PLATE

Technical Field

[1] The present invention relates to an apparatus for separating cutting gap of metal plate adopted by an apparatus for cutting a metal plate, more particularly to an apparatus which separate a cutting gap of a metal plate cut by a saw so that friction and damage of the saw may be prevented to facilitate smooth cutting operation.

[2]

Background Art

[3] Recently, it is suggested that an apparatus cuts a metal plate 2 using a circular saw 12 as shown in FIG. 1.

[4] The apparatus cutting the metal plate 2 results in a cutting gap 2a in the metal plate 2 by which cut-surfaces of the metal plate 2 press the circular saw 12 at both sides to generate heat and friction making a damage to the circular saw 12.

[5] Also, heat resulting from a friction between the circular saw 12 and the metal plate 2 may deform the metal plate. Such a deformation of the metal plate 2 makes the friction severer to thereby deteriorate the rotation of the circular saw 12 and generate burrs and scraps on the cut-surfaces of the metal plate 2.

[6] Another problem in the above cutting operation is that a rear portion of the circular saw 12 impacts on the cut-surfaces of the metal plate 2 which is already cut to get scratched so that the quality of the product is lowed.

[7] Conventionally, a user inserts a wedge into the cutting gap 2a manually to broaden the cutting gap 21 of the metal plate 2 to solve the above problems. However, since the wedge is inserted by a user, the wedge is not supported by a uniform and constant force so that the cutting gap 21 is not maintained constant and operational reliability is not assured.

[8] Considering the conventional problems, Korean patent application No.

10-2003-49800 discloses a device for inserting a wedge into the cutting gap of the metal plate by a hydraulic cylinder.

[9] Here, pressing force with respect to the wedge needs to increase corresponding to the increase in the length of the cutting gap as the metal plate is cut. However, the device applies a constant force to the wedge just by the hydraulic cylinder.

[10]

Disclosure of Invention Technical Problem

[11] The present invention is designed to solve the above problems of the prior art. It is an object of the invention to provide an apparatus for separating cutting gap of metal plate in which a wedge is inserted into the cutting gap by intermittently hitting the wedge to increase a insertion force of the wedge with respect to the cutting gap.

[12]

Technical Solution

[13] In order to accomplish the above object, the present invention provides an apparatus for separating cutting gap of metal plate adopted by a cutting machine including a circular saw for cutting a metal plate, the apparatus comprising: a wedge whose front end inserts into a cutting gap generated by the circular saw cutting the metal plate; and hitting means intermittently hitting a rear end of the wedge to insert into the cutting gap- [14] Preferably, the wedge inserts into the cutting gap in the horizontal direction, from the top or bottom. [15] The invention further comprises a guide for guiding the wedge to move in line with the cutting gap; and a rod extending from the wedge which is guided by the guide. [16] Also, the invention further comprises a transfer cylinder for moving the wedge and the hitting means in the direction in which the cutting gap is widened. [17] More preferably, the invention further comprises a pressing cylinder continuously pressing the wedge into the cutting gap, and wherein the hitting means hit a rear end of the pressing cylinder. Also, the pressing cylinder may be a dual rod typed cylinder. [18]

Advantageous Effects

[19] According to the apparatus for separating cutting gap of metal plate, an insertion force of the wedge into the cutting gap of the metal plate may increase by a hitting means. Accordingly, even though a cutting length of the metal plate is long, the cutting gap is sufficiently broadened. [20] As a result, a friction between the circular saw and the metal plate and heat generation is effectively prevented so that damages of the circular saw and cut-surfaces of the metal plate can be minimized. [21]

Brief Description of the Drawings [22] These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which. [23] FIG. 1 is a perspective view showing the operation in which the conventional circular saw cuts a metal plate;

[24] FIG. 2 is a plan view of FIG. 1 ;

[25] FIG. 3 is a perspective view in which an apparatus for separating cutting gap of metal plate is adopted by a cutting machine according to the present invention; [26] FIG. 4 is a plan view schematically showing the operation of an apparatus for separating cutting gap of metal plate according to the present invention; [27] FIG. 5 is a plan view specifically showing the operation of an apparatus for separating cutting gap of metal plate according to the present invention; [28] FIG. 6 is a perspective view in which an apparatus for separating cutting gap of metal plate is adopted by a cutting machine according to another embodiment of the present invention; [29] FIG. 7 is a plan view schematically showing the operation of an apparatus for separating cutting gap of metal plate according to another embodiment of the present invention; [30] FIG. 8 is a perspective view in which an apparatus for separating cutting gap of metal plate is adopted by a cutting machine according to still another embodiment of the present invention; and [31] FIG. 9 is a plan view schematically showing the operation of an apparatus for separating cutting gap of metal plate according to still another embodiment of the present invention. [32]

Best Mode for Carrying Out the Invention [33] FIG 3 is a perspective view schematically showing a cutting machine adopting an apparatus for separating cutting gap of metal plate according to the preferred embodiment of the present invention. FIG. 4 is a plan view of the apparatus for separating cutting gap of metal plate. [34] Referring to the drawings, the cutting machine 1 comprises a circular saw 12 which rotates at high speed to cut a metal plate 2 fixed by a jig 11 on the frame 10, a driving device 13 rotating the circular saw 12, and a transfer device for linearly moving the circular saw 12 back and forth. [35] As set forth above, the rotating circular saw 12 cuts the metal plate 2 fixed by the jig

11 with moving therethrough. At this time, a cutting gap 2a resulting from the cutting of the metal plate is broadened by an apparatus for separating cutting gap of metal plate 3 according to the present invention. [36] An apparatus for separating cutting gap of metal plate according to the preferred embodiment of the present invention comprises a wedge 21 inserted into the cutting gap 2a of the metal plate 2, and a hitting means 41 for intermittently hitting a rear end of the wedge 21.

[37] Preferably, the wedge 21 is inserted into the cutting gap 2a in the horizontal direction, but not limited to this, and alternatively the wedge may be inserted into the cutting gap from the top or bottom.

[38] In case the wedge 21 is inserted into the cutting gap 2a in the horizontal direction, the present invention comprises a guide 31 for guiding the reciprocal movement of the wedge 21 in line with the cutting gap. In this case, the wedge 21 reciprocates along the guide 31 fixed on the frame 10 so that a front end 22 of the wedge 21 is inserted into the cutting gap 2a of the metal plate 2.

[39] As shown in FIG. 4, the wedge 21 is formed with a thin and sharp front end 22, and is thicker as toward to a rear end (tapered from the rear end to the front end) to facilitate the insertion of the wedge 21 into the cutting gap 2a of the metal plate 2.

[40] Preferably, the degree of taper of the wedge may be appropriately adjusted. For example, once the wedge 21 is inserted into the cutting gap 2a by hitting of a hitting means as described later, it escapes out rare.

[41] Also, a rod 23 extending from the wedge 21 passes through a hole of the guide 31 on the frame 10 to reciprocate and transfer the impact of the hitting means 41 to the wedge 21.

[42] The hitting means 41 intermittently hits the rear end of the wedge 21 to advance the wedge 21 to insert into the cutting gap 2a of the metal plate 2. The hitting means 41 may include, for example, hydraulic cylinders, pneumatic cylinders, and solenoid actuators which are able to do the same function as the above.

[43] A plunger 42 of the hitting means 41 is spaced at predetermined distance from the rear end of the wedge 21, i.e., the rear portion of the rod 23, and intermittently hits the rear end of the wedge 21.

[44] When the hitting means 41 retracts, the front end of the plunger 42 is spaced from the rear end of the wedge 21, while on the plunger 42 advancing the front end of the plunger 42 hits the wedge 21 into the cutting gap 2a to thereby broaden the gap of the metal plate 2. For example, when the hitting means 41 adopts a hydraulic cylinder, the front end of the plunger 42 is spaced from the rear end of the wedge 21 with the plunger 42 retracting, while the plunger 42 advances by a hydraulic force to hit the rear end of the wedge 21 when the hydraulic cylinder is driven.

[45] Hereinafter the words intermittently hitting mean to hit the wedge periodically or aperiodically, excluding continuously pressing (biasing).

[46] A driving signal may be applied to the hitting means 41 manually or automatically.

The hitting means 41 retract or advance to hit the rear end of the wedge 21 in line with the cutting gap 2a so that the front end of the wedge 21 inserts into the cutting gap 2a.

[47] Also, pneumatic cylinders driving a plunger by compressed air or solenoid actuators moving an actuator according to an electrical signal may be adopted by the present

invention.

[48] Now the operation of the apparatus for separating cutting gap of metal plate according to the preferred embodiment of the present invention is described hereinafter.

[49] First, a metal plate 2 is fixed in the jig 11 of a metal plate cutting machine, and then a rotating circular saw 12 moves to cut the metal plate 2. As a result, a cutting gap 2a is formed in the metal plate 2.

[50] Then, a hitting means 41 positioned in the rear portion of the wedge 21 hit a rear end of the wedge 21 positioned in line with the cutting gap 2a to thereby insert into the cutting gap 2a. Accordingly, the cutting gap 2a is widened laterally.

[51] As the circular saw 12 continues to cut the metal plate 2, the cutting gap 2a lengthens. Then, the hitting means 41 is driven to hit the rear end of the wedge 21 so that the wedge 21 insert deep into the cutting gap 2a.

[52] FIGs. 6 and 7 show an apparatus for separating cutting gap of metal plate according to another preferred embodiment of the present invention. Here, the like numerical references denote the same members as those of the previous drawings.

[53] As shown in FIGs. 6 and 7, an apparatus for separating cutting gap of metal plate 3 of the present embodiment comprises a wedge 21 and hitting means 41 which move rectangular to a cutting gap 2a.

[54] To do so, the apparatus for separating cutting gap of metal plate of the present embodiment comprises a movable bracket 51 on which the wedge 21 and hitting means 41 are installed, and a transfer cylinder 53 moves the bracket 51 rectangular to the cutting gap 2a. Preferably, the bracket 51 is guided by transfer guides 52 formed rectangular to the cutting gap 2a.

[55] For example, a guide 31 for the reciprocal movement of the wedge 21 along the cutting gap 2a, and hitting means 41 hitting a rear end of the wedge 21 are provided on the transfer guides 52.

[56] The hitting means 41 is arranged in line with the wedge 21 on the bracket 51 so that the movement direction of the wedge 21 is the same as the hitting direction of the hitting means 41 in a line. Accordingly, with such an arrangement of the wedge 21 and hitting means 41 is maintained, they may be moved by the bracket 51.

[57] The transfer cylinder 53 is installed on a frame 10 to move the wedge 21 and the hitting means 41 rectangular to the cutting gap 2a. That is, a front end of a piston rod of the transfer cylinder 53 connects to one side of the bracket 51 so that the wedge 21 and the hitting means 41 may be moved to a desired position by driving of the transfer cylinder 53. With the transfer cylinder 53, the position of the wedge 21 can be adjusted according to the position of the cutting gap 2a, and the cutting gap 2a is easily widened by applying a force rectangular to the cutting gap 2a.

[58] Now the operation of an apparatus for separating cutting gap of metal plate according to the present embodiment will be described.

[59] According to the present embodiment, the wedge 21 can be arranged accurately corresponding to the cutting gap 2a. That is, the transfer cylinder 53 advances or retracts the piston rod to thereby arrange the front end of the wedge 21 in line with the cutting gap 2a.

[60] With such an arrangement, the hitting means 41 is driven to insert the wedge 21 into the cutting gap 2a.

[61] Also, the transfer cylinder 53 retracts the piston rod in the direction denoted by an arrow in FIG. 7, i.e., in the direction rectangular to the cutting gap 2a with the wedge 21 inserted into the cutting gap 2a so that the cutting gap 2a is more broadened to facilitate cutting operation of the machine.

[62] The wedge is moved rectangular to the cutting gap by the transfer cylinder, but not limited to this, and alternative configuration may be adopted. For example, the transfer cylinder may move the wedge in the direction at an angle with the cutting gap. In this case, the wedge moves in the front and lateral direction at the same time to widen the cutting gap. Consequently, the transfer cylinder moves the wedge in the direction in which the cutting gap is widened. Hereinafter, the direction in which the cutting gap is widened means the direction encompassing the direction rectangular to or at an angle with the cutting gap.

[63] FIGs. 8 and 9 show an apparatus for separating cutting gap of metal plate according to still another preferred embodiment of the present invention. Here, the like numerical references denote the same members as those of the previous drawings.

[64] As shown in FIGs. 8 and 9, an apparatus for separating cutting gap of metal plate 3 of the present embodiment comprises a wedge 21 inserted into the cutting gap 2a of the metal plate 2, a pressing cylinder 61 pressing the wedge 21 to insert into the cutting gap 2a, and hitting means 41 intermittently hitting a rear end of the pressing cylinder 61.

[65] The wedge 21 and the hitting means 41 are the same as the previous embodiment, and then specific description will be omitted.

[66] The pressing cylinder 61 presses a rear end of the wedge 21 to prevent the wedge 21 from returning backward. The wedge 21 is tapered from the rear end toward the front end, which facilitates the wedge 21 to insert into the cutting gap 2a. On the contrary, with the tapered profile, when the wedge 21 is pressed on the lateral sides, the wedge 21 would move backward. Specifically, the wedge 21 inserts into the cutting gap 2a upon hitting by the hitting means 41, while the cut-surfaces of metal plate 2 press the lateral sides of the wedge 21 to return backward when the wedge 21 is not hit by the hitting means 41.

[67] To prevent such a problem, the pressing cylinder 61 is adopted. The pressing cylinder 61 continuously presses the wedge 21 to remain inside the cutting gap 2a.

[68] Preferably, the pressing cylinder 61 includes a hydraulic cylinder, more preferably, a dual rod typed cylinder. The dual rod typed cylinder has a rod extending through the cylinder from the rear end to the front end, so rod is exposed on the rear and front portion. In case of the dual rod typed cylinder, impact by the hitting means 41 would not be lost, and would be transferred to the wedge 21 through the rod of the pressing cylinder 61.

[69] In the present embodiment the pressing cylinder 61 and the hitting means 41 are moved rectangular to the cutting gap by the transfer cylinder, but not limited to this, and alternative configuration may be adopted as described above.

[70] Although not described in the drawings and specification, the wedge may be inserted into the cutting gap from the top or bottom. For example, one end of a lever is connected to the main body and a wedge is provided on a free end of the lever. The lever rotates by a pressing cylinder so that the wedge of the free end of the lever moves in a circle to insert into the cutting gap. After the wedge inserts into the cutting gap, the hitting means of the present invention hit the rear end of the wedge.