KR200349000Y1 - 3 section cutting device of an iron plate for fire preventing door - Google Patents

Abstract

The present invention relates to a cutting device, and more particularly to a cutting device that can cut the front portion of the iron plate to be moved by cutting both sides of the patterned iron plate.

Simultaneous cutting device of both sides and front of the fire door patterned iron plate according to the present invention and the frame (1) is provided with a longitudinal guide (11) on both sides of the upper front; One and the other side cutting parts 4 and 5 which are provided on both sides of the center upper part of the frame 1 and are provided with rolling take-out cutting means 2 for cutting both sides of the iron plate in the longitudinal direction while moving the iron plate inside. Wow; A front cutting part (8) including cutting means (7) for cutting the front part of the iron plate in the transverse direction while being conveyed at the same speed as the movement of the iron plate through the conveying means (6) to the longitudinal guide (11); It characterized in that it comprises a front cutting control means 9 for controlling the front cutting of the moving iron plate.

Description

Three-section cutting device of an iron plate for fire preventing door}

The present invention relates to a cutting device, and more particularly, to a cutting device that can cut the front portion of the iron plate to be moved by cutting both sides of the patterned iron plate in more detail.

Generally, the patterned iron plate for a fire door is a thing attached to the front and back of a fire door to improve aesthetics, and generally means that various patterns or patterns are formed in the center.

Therefore, in the case of manufacturing the patterned iron plate first, the pattern or pattern is molded in the center of the iron plate larger than the size of the final product.

Then, both sides of the iron plate are cut in the longitudinal direction, respectively, or at the same time, and finally, either the front or the rear of the iron plate (hereinafter referred to as the front only for convenience) is cut in the transverse direction, thereby completing the finished product.

By the way, in manufacturing the patterned iron plate as described above, both the exclusive use for both sides cutting the side of the iron plate and the front dedicated device for cutting the front of the iron plate, the following problems occur.

In manufacturing a patterned iron plate, first, both sides of the iron plate are cut and then moved to the front platen machine installed separately from both sides of the iron plate. Occurred. Accordingly, there was a problem in that the mutual right angles of the most important ends in the patterned iron plate is wrong.

And if you want to cut the front side after machining both sides, the operator is to remove the pattern iron plate directly from both sides of the machine and then reattach to the front plate only when the problem that the thin pattern iron plate is easily bent I also had.

In addition, by using two dedicated machines alternately in the manufacture of patterned iron plate, there was also a problem of relying on manual work as the automation of the process is impossible to produce a patterned iron plate.

The present invention is designed to solve the above problems, the present invention is to provide a cutting device that can cut the front end of the cutting while cutting both sides of the patterned iron plate conveyed through the roller.

In particular, by cutting both sides and the front end of the iron plate through a single device, there is an object to prevent a defect such as the mutual perpendicularity between the respective ends of the cut iron plate is wrong.

And the present invention is to provide a cutting device capable of a continuous cutting process for both sides and the front portion of the iron plate in manufacturing a patterned iron plate.

1 is a view schematically showing a cutting device according to an embodiment of the present invention.

Figure 2 is an enlarged view of one and the other side cutting portion according to the present invention.

3 is a cross-sectional view taken along the line A-A shown in FIG.

4 is an enlarged view of a portion B shown in FIG. 2;

5 is a view for explaining a driving means of the rolling take-up cutting means according to the present invention.

Figure 6 is an enlarged view of the front cutting unit according to the present invention.

7 is a view for explaining the front cutting means according to the present invention.

8 is a cross-sectional view taken along the line C-C shown in FIG.

<Explanation of symbols for the main parts of the drawings>

1: frame

11: longitudinal guide

12: transverse guide

13: setting means

131: feed motor of the other side cutting portion, 132: screw shaft,

133: Screw Bracket

2: rolling take-out cutting means

21: upper roller

22: lower roller

23: side cutting part

231: cutting roller, 232: lower roller

24: driving means

241: drive motor, 242: chain connecting means, 243: gear connecting means

25: inclined plate

3: reference frame

31: inner moving plate

311: horizontal plate, 312: vertical plate

32: fixed plate

33: rotating handle

331: screw shaft

34: guide shaft

4: one side cutting part

5: other side cutting part

6: transfer means

61: front cutting unit feed motor

62: screw shaft

63: rear protrusion screw bracket

7: cutting means

71: through part

72: seating part

721 right angle blade

73: lifting cutting blade

731: lifting cylinder

8: front cutting part

9: front cutting control means

91: encoder

92: moving distance sensor

10: rolling bed

20: iron plate

Three-sided cutting device for a fire door iron plate according to an aspect of the present invention for achieving the above object is provided with a longitudinal guide is provided on both sides of the upper front, and provided on both sides of the center upper portion of the frame, the inner plate One side and the other side cutting portion is provided with a rolling take-out cutting means for cutting both sides of the iron plate in the longitudinal direction while moving the, and the front portion of the iron plate while being transferred at the same speed as the movement of the iron plate through the transfer means to the longitudinal guide A front cutting unit including a cutting means for cutting in the transverse direction, characterized in that it comprises a front cutting control means for controlling the front cutting of the moving iron plate.

According to this aspect of the present invention, the three-side cutting device (hereinafter referred to as "cutting device") of the fire door iron plate according to the present invention is a front cutting portion while cutting both sides of the iron plate in the longitudinal direction through a rolling take-out cutting means. It is possible to cut the front portion of the iron plate in the transverse direction through the cutting means provided.

In particular, the front cutting part for cutting the front part of the iron plate is cut while moving forward to the same as the moving speed of the iron plate it is possible to accurately cut the front part of the iron plate.

In addition, by cutting both sides and the front end of the iron plate through a single device, it is possible to prevent the defect such as the mutual perpendicularity between each end of the cut iron plate to be wrong, thereby improving the accuracy of the cutting process.

And according to an additional aspect of the present invention, the cutting device according to the present invention is provided with a steel plate that is drawn between the one, the other cutting portion on both rear sides of the one, the other side cutting portion is provided with a reference base for pressing the two ends of the iron plate in close contact. It is characterized by.

According to this aspect of the present invention, the cutting device according to the present invention finely adjusts both ends of the iron plate introduced into the one side and the other cutting portion through the reference table to correspond to the width of the one side and the other side cutting portion, so that both sides of the iron plate It can be cut accurately.

And according to an additional aspect of the present invention is a cutting device according to the present invention is provided with the one side cutting portion is fixed to the upper side of the frame, the other side of the cutting side is mounted on the other side of the upper side of the frame to the movable side A direction guide is further provided, and a screw shaft rotated through the other cutting unit feed motor mounted in the transverse direction on the upper portion of the frame to move the other cutting unit between the frame and the other cutting unit, and the other cutting unit It is provided in the lower portion is fastened to the screw shaft is characterized in that the setting means consisting of a screw bracket for moving the other cutting portion as a whole.

According to this aspect of the present invention, the cutting device according to the present invention is the other cutting portion is moved in the transverse direction from the top of the frame through the setting means, by adjusting the distance between the one, the other cutting portion in accordance with the size of the iron plate to be inserted It also has the advantage that it can be used for steel plates of various sizes.

These and further aspects of the present invention will become more apparent through the following preferred embodiments with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

1 is a perspective view schematically showing both side and front simultaneous cutting apparatus of a patterned iron plate according to an embodiment of the present invention.

As shown in FIG. 1, the cutting device according to the present invention includes a frame 1 provided with longitudinal guides 11 on both sides of the upper front, and an iron plate 20 provided on both sides of the center upper portion of the frame 1. One side and the other side cutting portions 4 and 5 for cutting both sides of the iron plate while moving), and the front cutting portion 8 for cutting the front portion of the iron plate that is moved while being transported along the longitudinal guide 11 in the transverse direction; , Front cutting control means (not shown) for controlling the driving of the front cutting unit (8).

And according to an additional aspect of the present invention is a cutting device according to the present invention is placed on the iron plate 20 drawn between the one, the other side cutting portion (4,5) and the reference stage for pressing the two ends of the iron plate in close contact Is further provided.

According to such a configuration, the cutting device according to the present invention can cut the front end in the transverse direction while cutting both sides of the iron plate through the one side and the other side cutting portion. In particular, as the front cutting unit cuts while moving forward at the same speed as the moving speed of the iron plate, it is possible to accurately cut the front part of the iron plate.

And by adjusting the both ends of the iron plate introduced into the one side and the other cutting portion through the reference table in accordance with the width of the one side, the other side, it is possible to more accurately cut both sides of the iron plate.

In addition, by cutting both sides and the front portion of the iron plate through a single device, it is possible to prevent defects such as incorrect mutual angle between each end of the cut iron plate, as well as both sides of the iron plate in manufacturing the patterned iron plate A continuous cutting process for the front part is possible, which allows automation of the process.

Hereinafter, each configuration of the present invention will be described in more detail with reference to FIGS. 2 to 8.

FIG. 2 is an enlarged view of one and the other cutting parts according to the present invention, and FIG. 3 is a cross-sectional view taken along the line A-A of FIG. And Figure 4 is an enlarged view of the portion B shown in Figure 2, Figure 5 is a view for explaining the driving means of the rolling take-up cutting means according to the present invention.

One and the other side cutting parts 4 and 5 according to the present invention are provided on both sides of the center upper portion of the frame 1 as shown in FIG. 2, and both sides of the iron plate are cut in the longitudinal direction while moving the iron plate 20 inside. Rolling take-off cutting means 2 is provided. And it is provided with a reference stage (3) for pressing both ends of the iron plate introduced to both sides of the rear.

Accordingly, the one side and the other side cutting parts 4 and 5 cut both sides of the iron plate drawn in through the reference table in the longitudinal direction through the rolling take-out cutting means 2.

The reference table 3 according to the present invention consists of a horizontal plate 311 on which the iron plate 20 is raised and a vertical plate 312 in close contact with both ends of the iron plate 20 as shown in FIGS. 2 and 3. The inner movable plate 31, the fixed plate 32 protruding perpendicularly to the outside of the inner movable plate 31, and the end plate connected to the outside of the inner movable plate 31 by being fastened through the center of the fixed plate 32. And a plurality of guides protruding from the outside of the inner movable plate 31 and penetrating the fixed plate 32 by a rotation handle 33 including a screw shaft 331 for adjusting the distance between the inner movable plates 31 on both sides. It consists of an axis 34.

Therefore, the cutting device according to the present invention sets the width of the iron plate introduced through the operation of the rotary handle of the reference bar with respect to the width of one and the other cutting parts, thereby more accurately cutting both sides of the iron plate to manufacture the iron plate required by the operator. Will be.

On the other hand, the rolling take-out cutting means (2) for cutting both ends of the iron plate introduced through the reference base is provided in one or more rows on the inlet side of the iron plate as shown in Figures 2 and 4 a pair or more to convey the iron plate The upper and lower rollers 21 and 22, and the cutting roller 231 is provided on the discharge side of the iron plate and the lower roller 232 in close contact with the cutting roller 231 is provided on the lower side of the iron plate. Driving means 24 for interlocking the side cutting portion 23 for cutting both sides, the upper and lower rollers 21 and 22, the cutting roller 231 and the lower roller 232 through one driving motor 241. It consists of

4 and 5, the driving means 24 interconnects one driving motor 241, one of the lower rollers 22 and one of the lower rollers 232, and a rotating shaft of the driving motor. The chain connecting means 242 and the gear connecting means 243 for interconnecting the rotary shaft of the upper and lower rollers (21, 22) and the cutting roller 231 and the lower rollers (232).

In addition, it is preferable that the inclined plate 25 for guiding discharge of the cutting piece cut through the cutting roller 231 and the lower roller 232 to the lower side in front of the side cutting portion 23 is preferably fixed.

At this time, it is preferable to provide an auxiliary inclined plate 233 for guiding the cutting piece to the inclined plate 25 inside the front side of the side cutting part 23. Because by preventing the sagging of the cutting pieces cut by the side cutting portion through the auxiliary inclined plate, it is possible to cut both ends of the iron plate more accurately by preventing the load is applied to the side cutting portion by the cutting piece struck down.

On the other hand, although the above-mentioned one side and the other side cutting part 4 and 5 can all be fixed to the upper center of a frame as mentioned above, it can also be designed so that any one side of a cutting part may move on a frame.

That is, in another embodiment of the present invention, as shown in Figure 2 and 3, one side cutting portion 4 is fixed to one side of the upper frame 1, the upper side of the frame on the opposite side of the one side cutting portion 4 The lateral guide 12 in which the other side cutting part 5 mentioned above is movable is further provided.

In this embodiment, the other cutting part feed motor 131 mounted in the horizontal direction on the upper part of the frame 1 so as to move the other cutting part 5 between the frame 1 and the other cutting part 5. Setting means consisting of a screw shaft 132 to be rotated through, and a screw bracket 133 is provided at the lower portion of the other cutting portion 5 and the screw shaft 132 is fastened to move the other cutting portion 5 as a whole. (13) is provided.

In this embodiment, the inner surface of the screw bracket 133 provided on the lower side of the other cutting portion 5 is helically coupled to the screw shaft 132 rotated by the other cutting portion feed motor 131. Accordingly, the screw shaft 132, which is rotatably connected to the feed motor 131 fixed to the frame, is rotated so that the screw bracket is moved on the screw shaft and the other cutting portion 5 is moved to the one cutting portion 4 side. do. At this time, the other cutting part 5 is moved through the lateral guide 12 provided in the frame 1 in the lateral direction.

According to this configuration, the cutting device according to the present invention is moved in the transverse direction from the top of the frame through the setting means, by adjusting the interval between the one, the other side cutting portion in accordance with the size of the iron plate to be processed to more various sizes It has the advantage that it can be used for iron plate.

Hereinafter, the front cutting unit will be described in more detail with reference to FIGS. 6 to 8.

6 is an enlarged view of the front cutting unit according to the present invention, and FIG. 7 is a view for explaining the front cutting unit according to the present invention. 8 is a cross-sectional view taken along the line C-C shown in FIG.

The front cutting part 8 according to the present invention is a front portion of the iron plate which is moved while being transported along the longitudinal guides 11 provided on both front upper sides of the frame 1 on which one and the other cutting parts 4 and 5 are installed. Cut in the transverse direction.

In other words, in one preferred embodiment of the present invention the front cutting portion 8 is moved at the same speed as the movement of the iron plate along the longitudinal guides 11 provided on both sides of the front upper side of the frame through the transfer means (6) And cutting means 7 for cutting the front part of the iron plate in the transverse direction.

The conveying means 6 for conveying the front cutting part is mounted in the longitudinal direction at the center of the frame 1 as shown in Figs. 6 and 8, the screw shaft 62 is rotated through the front cutting part feed motor 61 And it is provided in the lower portion of the body of the front cutting unit 8 is fastened to the screw shaft 62 is composed of a rear protruding screw bracket 63 to move the front cutting unit 8 as a whole.

That is, the front cutting unit conveying means 6 is the front and rear of the screw bracket 63 which is spirally coupled on the screw shaft 62 as the screw shaft 62 is rotated by the driving of the front cutting unit feed motor 61. Will be moved to. Accordingly, the body of the front cutting part 8 fixed to the front of the screw bracket 63 moves along the longitudinal guides 11 provided on both sides of the upper part of the frame 1. At this time, the front cutting unit feed motor 61 is controlled so that the front cutting unit 8 is transferred at the same speed as the moving speed of the iron plate by the control means to be described later.

And the cutting means 7 of the front cutting portion is formed in the center of the body as shown in Figs. 6 and 7, the through portion 71 through which the iron plate passes, and the rear portion of the through portion 71 is provided on the iron plate is seated In front of the right angle blade 721 through a plurality of lifting cylinders 731 is mounted in the middle of the seating portion 72 is provided with a right angle blade portion 721 in the front, and the upper body of the through portion 71 Lifting is composed of a lifting cutting blade 73 for cutting the front of the iron plate.

Therefore, the cutting of the front part of the iron plate passing through the through part is made by the cutting means while moving forward through the above-described conveying means. In other words, the elevating cutting blade portion is lowered to the right angle blade portion of the seating portion by the driving of the elevating cylinder to cut the steel plate moved in the transverse direction.

As described above, the iron plate whose front part is cut by the front cutting part, that is, the iron plate whose cutting process is completed, has a rolling bed 10 having the same height as the seating part 72 in front of the front cutting part 8 as shown in FIG. 1. Is transferred to the outside of the cutting device. Accordingly, it is possible to prevent the bending of the iron plate discharged from the front cutting portion 8 through the rolling bed (10).

Meanwhile, in a preferred embodiment of the present invention, the front inclined plate 74 is fixed to the front lower portion of the seating portion 72 for guiding discharge of the front cutting piece of the iron plate cut by the cutting means 7 to the lower portion. have.

Accordingly, the cut front cutting pieces are automatically discharged downwardly through the front inclined plate without accumulating in front of the seating portions formed by the right angled blades, so that the operator does not need to remove the cut front cutting pieces one by one. You can prevent the risks in advance.

The conveying means and the cutting means of the front cutting unit is operated by the control signal of the front cutting control means. That is, the driving of the front cutting unit feed motor and the lifting cylinder constituting the transfer means is driven by the control signal of the control means.

In a preferred embodiment of the present invention, the front cutting control means 9 is provided on the rotary shaft of the lower roller 22 or the lower roller 232 as shown in FIG. 8 to measure the amount of displacement of the steel plate ( 91, the sensor 72 is recessed in the center of the seating portion 72 to detect the entry of the iron plate, and the front cutting unit by using the data input from the encoder 91 and the sensor 92 A control unit (not shown) for controlling the driving of the feed motor 611 is included.

Accordingly, the front cutting control means 9 according to the present invention detects the introduction of the iron plate to the front cutting unit through the detection sensor 92 and the encoder 91 to cut the front portion of the iron plate. In other words, when the iron plate detection signal is input from the sensor, the control unit receives a signal output from the encoder from this time and calculates the moving speed of the iron plate and the moving distance of the iron plate passing through the front cutting unit.

In this way, by using the data input from the encoder according to the present invention by calculating the moving speed and the moving distance of the iron plate to be controlled by controlling the drive of the front cutting unit feed motor and the lifting cylinder, the front cutting unit and the moving speed of the steel plate It is possible to cut the front of the iron plate while moving at the same speed.

Therefore, it is possible to vertically cut the front part of the moving iron plate which can be said to be a characteristic aspect of the present invention, and it is possible to prevent the mutual perpendicularity between the iron plate ends during the cutting.

Hereinafter will be described the operation relationship of the cutting device according to the present invention.

First, when the driving motor 241 provided on one side of the frame 1 rotates, the front lower roller interlocked with the rotating shaft of the driving motor and the chain connecting means 242 as shown in FIGS. 4 and 5. 22a rotates clockwise. Accordingly, the main gear 243a, which is inserted into and fixed to the rotation shaft of the front lower roller 22a, is rotated so that the transmission gears 243b engaged in the front and rear sides rotate in opposite directions.

On the contrary, as the transmission gears 243b rotate, the rear lower roller 22b and the lower roller 232 provided at the front and rear of the front lower roller 22a are in the same direction as the front lower roller 22a. Is rotated. At this time, the upper roller 21 and the cutting roller 231 are rotated in a direction opposite to the rotational direction of the lower roller and the lower roller through the gear means 243, to take the iron plate to be introduced forward.

And both sides of the iron plate conveyed to the front by the upper and lower rollers 21 and 22 pass through the side cutting portion 23 provided in front of the one and the other cutting portion 4, 5 while cutting roller 231 and It is cut by the lower roller 232.

At this time, it is preferable that the iron sheet to be drawn in is introduced into one and the other side cutting parts using a reference table (see Fig. 1). Because both ends of the iron plate is brought into close contact with the inner movable plate of the reference base, it is possible to cut both sides of the iron plate more accurately to manufacture the iron plate required by the operator.

In this way, the iron plate cut by both sides by the side cutting unit 23 is moved to the front cutting unit 8 provided at the front by the driving means 24 of the iron plate described above.

Meanwhile, as shown in FIG. 8, when an iron plate detection signal is input from the detection sensor 92 provided at the rear of the body of the front cutting unit 8, the controller of the control unit outputs a signal output from the encoder 91 at this time. Using to calculate the moving speed of the iron plate and the moving distance of the iron plate passing through the front cutting unit. Then, the driving of the front cutting unit feed motor 61 is controlled to move the front cutting unit in the same manner as the calculated moving speed of the iron plate. Accordingly, the front cutting portion is moved at the same speed as the moving speed of the iron plate.

That is, when the screw shaft 62, which is the rotating shaft of the front cutting unit feed motor 61, is rotated by the control signal of the controller, the screw bracket is integrally connected to the body of the front cutting unit and is spirally coupled to the screw shaft 62. 63 will deviate relatively forward. Accordingly, the front cutting portion 8 is moved along the longitudinal guide 11 provided on both front upper sides of the frame 1.

When the moving distance of the steel plate passing through the front cutting part using the input signal from the encoder coincides with the value set by the operator, the lifting cylinder moves while moving at the same speed as the moving speed of the steel plate by the above-described conveying means. The cylinder control signal is output to control the driving of the cutting means to cut the front part of the steel plate.

As described in detail above, the three-side cutting device for the fire door iron plate according to the present invention is a front portion of the iron plate through the cutting means provided in the front cutting portion while cutting both sides of the iron plate in the longitudinal direction through the rolling take-out cutting means. It is possible to cut in the transverse direction.

In particular, by cutting the front part of the iron plate while the front cutting unit for cutting the front part of the iron plate is moved at the same speed as the moving speed of the iron plate, it is possible to vertically cut the front part of the moving iron plate.

In addition, by cutting both sides and the front end of the iron plate through a single device, it is possible to prevent the defect such as the mutual perpendicularity between the respective ends of the cut iron plate to be incorrect, thereby improving the accuracy of the cutting process.

And both ends of the iron plate can be more precisely cut by finely adjusting both ends of the iron plate introduced into the one side and the other side cutting part through the reference table to correspond to the width of the one side and the other side portion.

In addition, the cutting unit for cutting both sides of the iron plate is moved in the transverse direction from the upper portion of the frame through the setting means, it can be used for iron plate of more various sizes by adjusting the interval between the one side and the other cutting portion according to the size of the iron plate to be inserted There is an advantage.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the present invention from this description. Therefore, the scope of the present invention should be interpreted by the utility model registration claims described to include many such variations.

Claims (10)

A frame (1) having longitudinal guides (11) provided at both upper front sides thereof; One and the other side cutting parts 4 and 5 which are provided on both sides of the center upper part of the frame 1 and are provided with rolling take-out cutting means 2 for cutting both sides of the iron plate in the longitudinal direction while moving the iron plate inside. Wow; A front cutting part (8) including cutting means (7) for cutting the front part of the iron plate in the transverse direction while being conveyed at the same speed as the movement of the iron plate through the conveying means (6) to the longitudinal guide (11); Front cutting control means (9) for controlling a front cutting of the moved steel plate; Three-sided cutting device for the iron plate for fire doors comprising a. The method according to claim 1, wherein on both rear sides of the one and the other side cutting parts (4, 5), Iron plate drawn between the one and the other side cutting portion (4,5) is raised and the three-stage cutting device for a fire door iron plate, characterized in that it further comprises a reference base for pressing the two ends of the iron plate in close contact. The method of claim 2, wherein the reference stage (3) is: An inner movable plate 31 consisting of a horizontal plate 311 on which the iron plate is raised and a vertical plate 312 in which both ends of the iron plate are in close contact with each other, and a fixed plate 32 protruding perpendicularly to the outside of the inner movable plate 31. ), And a screw shaft 331 including a screw shaft 331 which penetrates through the center of the fixing plate 32 and has an end connected to an outer side of the inner moving plate 31 to adjust the gap between the inner moving plates 31 on both sides. The three-sided cutting device for a fire door iron plate, characterized in that composed of a handle 33 and a plurality of guide shafts (34) protruding from the outside of the inner movable plate (31) and penetrates the fixing plate (32). The method of claim 1, The one side cutting portion 4 is fixed to the upper side of the frame 1, Opposite side of the one side cutting portion 4 is further provided with a lateral guide 12, the other side cutting portion 5 is mounted to the upper portion of the frame to be movable, Screw shaft rotated between the frame 1 and the other cutting portion 5 by the other cutting unit feed motor 131 mounted in the transverse direction on the upper portion of the frame to move the other cutting portion (5) 132 and the setting means 13 which is provided at the lower portion of the other cutting portion 5 and the screw shaft 132 is fastened so that the screw bracket 133 moves the other cutting portion 5 as a whole. Three-sided cutting device of the iron plate for the fire door, characterized in that further provided. The method according to any one of claims 1 to 4, The conveying means 6 of the front cutting part is mounted in the longitudinal direction in the center of the frame 1, the screw shaft 62 is rotated through the front cutting part feed motor 61 and the front cutting part 8 A lower protruding screw bracket (63) provided at the lower part of the body to fasten the screw shaft (62) to move the front cutting part (8) as a whole; The cutting means 7 of the front cutting part is formed in the center of the body, the through part 71 through which the iron plate passes, and is provided at the rear of the through part 71 so that the iron plate is seated and the right angle blade 721 is provided at the front. It is mounted in the middle of the seating portion 72 and the body that is the upper portion of the through portion 71 is provided by the elevating cylinder 731 through a plurality of elevating cylinder in front of the blade 721 to cut the front part of the iron plate Three-sided cutting device of the iron plate for the fire door, characterized in that consisting of the lifting cutting blade portion 73. The rolling take-out cutting means (2) according to claim 5, wherein the rolling take-out cutting means (2) is provided symmetrically to the inside of the one and the other side cutting parts (4, 5). One or more pairs of upper and lower rollers 21 and 22 provided in one or more rows on the inlet side of the iron plate to convey the iron plate; The cutting roller 231 is provided on the discharge side of the iron plate is provided on the upper side, and the lower roller 232 is provided on the lower portion in close contact with the cutting roller 231 to cut both sides of the iron plate 23 )Wow, The upper and lower rollers 21 and 22, the cutting roller 231 and the lower roller 232 of the drive means 24 for interlocking rotation through one drive motor 241 of the steel plate for a fire door 3-sided cutting device. 7. A drive according to claim 6 wherein the drive means 24 comprises: One drive motor 241, Chain connecting means 242 for interconnecting the rotary shaft of one of the lower roller 22 and the lower roller 232 and the drive motor 241, and The upper and lower rollers (21, 22), the cutting roller 231 and the three-sided cutting device of the iron plate for fire doors, characterized in that consisting of gear connecting means (243) interconnecting the rotating shaft of the lower rollers (232). The inclined plate 25 of claim 6, wherein the inclined plate 25 guides discharge of the cutting pieces cut through the cutting roller 231 and the lower roller 232 to the lower side. Three-sided cutting device for the steel plate for fire doors. 7. The front cutting control means (9) according to claim 6, characterized in that: An encoder 91 provided on the rotation shaft of the lower roller 22 or the lower roller 232 to measure an amount of displacement of the iron plate; Detected in the center of the seating portion 72 is provided with a detection sensor 92 for detecting whether the iron plate is inserted; And a control unit for controlling the driving of the front cutting unit feed motor 611 by using data input from the encoder 91 and the sensing sensor 92. 3. The method according to any one of claims 1 to 4, In front of the front cutting unit 8 is characterized in that the rolling bed 10 is further provided with the same height as the seating portion 83 to prevent the bending of the iron plate discharged through the front cutting unit (8) Three sides cutting device for fire door steel plate.