Description

APPARATUS FOR MANUFACTURING WINDOWS AND DOOR

FRAME

Technical Field

[1] The present invention relates to an apparatus for manufacturing window and door frames, and more particularly, to such an apparatus for manufacturing window and door frames, in which a steel coil and a panel cut in a V-shape are easily bent in various shapes and sizes by using a pinch roll set and a forming roll set, thereby improving convenience and economic efficiency in the manufacture of window and door frames. Background Art

[2] In general, insulating windows and doors have heat and sound insulation functions, and are widely used in general houses, shopping malls, buildings, apartments, offices and the like. The material of the insulating windows and doors is aluminum, PVC or the like. An insulating window or door is composed of a sash fixed to a wall and a window or door frame hingedly coupled to the sash.

[3] In the meantime, an architectural stainless steel plate used for manufacturing the insulating window or door is commercially available in the market in a standardized dimension with a width of Im and a length of 3m or 4m. However, generally, window frames for first floor stores in the shopping malls have a height of 2.6m-2.7m more or less. Thus, an expensive stainless steel plate with a height of 3m is cut into a plate piece less than 2.7m in height, so that a residue of a length of 30cm or more are discarded to be disposed of into scrap metal. A large amount of residue and debris is generated in the course of cutting the stainless steel plate with a standardized width of Im to manufacture the window and door frames, which contributes to an increase in both the manufacturing cost and resource consumption.

[4] In addition, a bending process is performed in such a fashion that a stainless steel plate portion cut in a V-shape by a blade of a bending machine is pressed sequentially to allow an angle defined by the pressed portion to match to a desired angle, the blade of the bending machine is replaced by a new one depending on the state of the frame to bend the plate while sequentially turning the plate upside down to thereby form a final window and door frame. Also, there may be occurred an increase in a defective ratio and a difference in production capability and product quality depending on the proficiency of a craftsman. Nevertheless, a sole method of processing a window and door frame for windows is the conventional bending process by the bending machine.

[5] The window frames for use in the stores formed by the existing bending machine

are susceptible to sound, wind, dust, etc. and have a low heat-insulating capacity to thereby lead to an increase in energy loss during the cooling and heating operations. In order to overcome this shortcoming, a reinforced glass door includes the upper and lower H-bars (stainless steel frames fit around the upper and lower ends of a reinforced glass for protecting the glass) having mohair grooves formed therein for allowing mohair to fit thereto for the purpose of soundproof and windproof. However, a gap is defined between the stainless steel frame and the reinforced glass door due to the mohair grooves. For this reason, a weather strip or a tape is attached to the gap to prevent introduction of outdoor dust and air into the indoor environment, which makes the outer appearance of the door poor and does not provide practicability. Disclosure of Invention Technical Problem

[6] Accordingly, the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior art, and it is an object of the present invention to provide an apparatus for manufacturing window and door frames, which includes pinch roll sets and forming roll sets capable of freely moving a stainless steel plate for the window and door frames to selectively apply physical pressure to a bent portion of the product, thereby improving convenience and economic efficiency of the manufacture of the window and door frames. Technical Solution

[7] To accomplish the above object, according to the present invention, there is provided an apparatus for manufacturing window and door frames, comprising: a puncher adapted to partially punch a plate cut in a V-shape to perform a chamfering operation on the plate; a leveller adapted to pressurize the top and bottom portions of the V-shaped cut plate using upper and lower rolls thereof to improve flatness of the plate; a plurality of sets of pinch rolls each including active upper and lower rolls and adapted to forcibly transport the pressurized plate after receiving a power from the outside, the pinch roll sets being disposed at uniform intervals in a row to cause the plate to be continuously transported to various roll-forming sections; a plurality of sets of forming rolls disposed in a plurality of roll- forming sections divided between the pinch roll sets at uniform intervals in such a fashion as to be alternately arranged with two adjacent ones of the pinch roll sets, each of the plurality of forming roll sets being constructed of a passive rotary roller type which is not supplied with separate power and adapted to pressurizingly selectively bent the to-be-bent portions of the V-shaped cut parts of the plate transported through the pinch roll sets; an electric motor connected to each of the pinch roll sets by means of a chain so as to transfer a rotating power to the pinch roll sets; a calibration roll adapted to calibrate the top and bottom

surfaces and both lateral surfaces of the plate in which the forming work has been completed; a cutter adapted to cut a finished plate in which the calibration has been completed; and a control device adapted to control the drive of the pinch roll sets and the vertical and horizontal movements of the forming roll sets to bend desired portions of the plate at a given pressurizing pressure.

[8] In addition, an apparatus for manufacturing window and door frames, comprising: a puncher adapted to partially punch a plate cut in a V-shape to perform a chamfering operation on the plate; a leveller adapted to pressurize the top and bottom portions of the V-shaped cut plate using upper and lower rolls thereof to improve flatness of the plate; a plurality of sets of pinch rolls each including active upper and lower rolls and adapted to forcibly transport the pressurized plate after receiving a power from the outside, the pinch roll sets being disposed at uniform intervals in a row to cause the plate to be continuously transported to various roll-forming sections; a plurality of sets of forming rolls disposed in a plurality of roll- forming sections divided between the pinch roll sets at uniform intervals in such a fashion as to be alternately arranged with two adjacent ones of the pinch roll sets, each of the plurality of forming roll sets being constructed of a passive rotary roller type which is not supplied with separate power and adapted to pressurizingly selectively bent the to-be-bent portions of the V-shaped cut parts of the plate transported through the pinch roll sets; forming roll pitch adjustment means including a forming roll connection portion connected at one sides of the forming roll sets, a forming roll support coupled to the top and bottom ends of the forming roll connection portion, a nut portion connected at one end thereof to the forming roll support, a threaded shaft adapted to fittingly penetrate into the nut portion, a handle adapted to drive the shaft to cause the forming roll support to be displaced along with movement of the nut portion so as to laterally move the forming roll sets coupled to the forming roll connection portion connected to the forming roll support; an electric motor connected to each of the pinch roll sets by means of a chain so as to transfer a rotating power to the pinch roll sets; a calibration roll adapted to calibrate the top and bottom surfaces and both lateral surfaces of the plate in which the forming work has been completed; a cutter adapted to cut a finished plate in which the calibration has been completed; and a control device adapted to control the drive of the pinch roll sets and the vertical and horizontal movements of the forming roll sets to bend desired portions of the plate at a given pressurizing pressure.

[9] The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings.

Advantageous Effects

[10] As described later, the present invention provides an advantageous effect in that it includes pinch roll sets and forming roll sets in a series of working spaces, and a puncher and a cutter are properly disposed at the front and rear of the pinch roll sets and the forming roll sets so that all the various window and door frames can be manufactured in a single line. Brief Description of the Drawings

[11] FIG. 1 is a diagrammatic view illustrating the overall layout of the present invention;

[12] FIG. 2 is a diagrammatic view illustrating the configuration of first forming roll sets of the present invention;

[13] FIG. 3 is a diagrammatic view illustrating the configuration of second forming roll sets of the present invention;

[14] FIG. 4 is a diagrammatic view illustrating the configuration of third forming roll sets of the present invention;

[15] FIGs. 5 (a) to 5(e) are diagrammatic views illustrating the configuration of pinch roll sets of the present invention;

[16] FIGs. 6(a) and 6(b) are views illustrating first and second process types of the present invention, respectively;

[17] FIGs. 7 (a) and 7(b) are views illustrating third and fourth process types of the present invention, respectively;

[18] FIGs. 8(a) and 8(b) are views illustrating fifth and sixth process types of the present invention, respectively;

[19] FIGS. 9(a) and 9(b) are views illustrating upper and lower molds of a high-speed puncher of the present invention;

[20] FIG. 10 is a view illustrating the assembly of a pinch roll of the present invention;

[21] FIG. 11 is a view illustrating the assembly of a forming roll A of the present invention;

[22] FIG. 12 is a view illustrating the driving scheme of an upper pinch roll A of the present invention;

[23] FIG. 13 is a view illustrating the mechanical structure of a forming roll of the present invention; and

[24] FIG. 14 is a block diagram illustrating the construction of an apparatus for manufacturing window and door frames according to the present invention. Best Mode for Carrying Out the Invention

[25] Reference will now be made in detail to the preferred embodiment of the present invention with reference to the attached drawings.

[26] Throughout the drawings, it is noted that the same reference numerals will be used

to designate like or equivalent elements although these elements are illustrated in different figures. In the following description, the detailed description on associated known function and construction unnecessarily obscuring the subject matter of the present invention will be avoided hereinafter.

[27] FIG. 1 is a diagrammatic view illustrating the overall layout of the present invention, FIG. 2 is a diagrammatic view illustrating the configuration of first forming roll sets of the present invention, FIG. 3 is a diagrammatic view illustrating the configuration of second forming roll sets of the present invention, FIG. 4 is a diagrammatic view illustrating the configuration of third forming roll sets of the present invention, FIGs. 5(a) to 5(e) are diagrammatic views illustrating the configuration of pinch roll sets of the present invention, FIGs. 6(a) and 6(b) are views illustrating first and second process types of the present invention, respectively, FIGs. 7(a) and 7(b) are views illustrating third and fourth process types of the present invention, respectively, FIGs. 8(a) and 8(b) are views illustrating fifth and sixth process types of the present invention, respectively, FIGS. 9(a) and 9(b) are views illustrating upper and lower molds of a high-speed puncher of the present invention, FIG. 10 is a view illustrating the assembly of a pinch roll of the present invention, FIG. 11 is a view illustrating the assembly of a forming roll A of the present invention, FIG. 12 is a view illustrating the driving scheme of an upper pinch roll A of the present invention, FIG. 13 is a view illustrating the mechanical structure of a forming roll of the present invention, and FIG. 14 is a block diagram illustrating the construction of an apparatus for manufacturing window and door frames according to the present invention.

[28] The present invention includes a puncher 10, a leveller 20, a pinch roll set 30, a forming roll set 40, an electric motor 50, a calibration roll 60, a cutter 70, a control device 80 and an encoder 90. Non-explained reference numeral 100 denotes a part of a V-shape cutting device, 110 denotes a product rack, and 120 denotes a plate.

[29] The puncher 10 is mounted to perform a necessary chamfering operation at uniform intervals on the plate 120 cut in a V-shape.

[30] Of course, the plate 120 is typically wound in a coil shape, and thus the chamfering operation may be performed on the coil shaped plate using the puncher 10 while paying out the plate. Alternatively, after the plate is formed in a square panel shape, the chamfering operation may be performed on the panel shaped plate using the puncher 10.

[31] The leveller 20 includes an upper roll and a lower roll, and pressurizes the top and bottom portions of the V-shaped cut plate 120 by the upper and lower rolls so as to improve flatness of the plate 120 to thereby produce a better-quality product.

[32] The pinch roll set 30 is an active roller for forcibly transporting the pressurized plate 120 and includes an upper roll 30a and a lower roll 30b. The upper roll 30a is of a

cylindrical shape which is not curved at the surface thereof and is connected to an electric motor 50 so that it can forcibly rotate by power supplied from the outside. The lower roll 30b allows the plate 120 to be formed with various flections conforming to each working steps to smoothly transport the plate. FIGs. 5 (a) to 5(e) illustrate various types of pinch roll sets of the present invention. The lower roll 30b has flections formed thereon in conformity with the shape of the plate 120 to be formed. For your reference, a total of seven pinch roll sets 30 are included in the present invention and are represented by Xl - X7 for the sake of convenience of explanation.

[33] In other words, various flections are formed on the lower roll 30b of the pinch roll set 30 in conformity with different forms of the plates formed in each manufacturing step for the purpose of smooth transportation of the plate.

[34] The pinch roll sets 30 are disposed at uniform intervals in a row to enable the to- be-formed plate to be smoothly transported to various different roll-forming sections.

[35] The forming roll set 40 is interposed between the pinch roll sets 30, and is formed in plural numbers in the unit of "set" so as to selectively bend the portions of the plate to be bent without being supplied with a separate power. For your reference, a total of twelve sets of forming rolls are exemplified in the present invention, and four sets of forming rolls are represented by the unit of one block to allow the total of twelve forming roll sets to be expressed by a total of three blocks for the sake of convenience of explanation. Also, for the convenience's sake of explanation, reference numerals of respective forming roll sets are represented by the unit of one block such that a first block is denoted by Al, A2, A3 and A4, a second block is denoted by B 1, B2, B3 and B4, and a third block is denoted by Cl, C2, C3 and C4.

[36] That is, the forming rolls 40 are constructed in the unit of set so as to bend the to- be-bent portions of the plate in each roll-forming step. At an initial stage, the plate is bent at 45°and then at the next stage is bent at 90°to thereby form a right-angled plate. Of course, it is to be noted that the to-be-bent portions of the plate can be caused to be bent at right angles naturally by providing an additional step, if necessary.

[37] The most important feature of the present invention reside in that only the to- be-bent portions of the plate are bent using the rolls of the forming roll sets 40. This feature is different from a conventional method in which a forming device transfers a power to forming rolls to allow the forming rolls to transport an entire plate while pressurizing the entire plate. In the present invention, since only the to-be-bent portions of the plate are pressurized by the rolls of the forming roll sets during transportation of the plate, the plate can be bent in a state where the physical properties of the plate are maintained as it is.

[38] That is, if the entire plate passes through rollers to form the plate, since pressure rollers transport the entire plate while pressing the entire plate, the overall surface of

the plate is pressed to degrade the physical properties of the plate, which may cause a problem in that the strength of the plate material decreases or the plate is distorted. However, the present invention allows the forming roll set 40 to press only the to- be-bent portions of the plate to prevent the plate from being stimulated unnecessarily to protect the physical properties of the plate to thereby exhibit a sufficient rigidity.

[39] In addition, the forming roll sets 40 may manually adjust pitches of the forming rolls using a forming roll pitch adjustment means including a handle 41, a shaft 42 formed with threads and a nut structure 43 and may automatically adjust pitches of the forming rolls by having a deceleration motor installed thereon. Although the manual adjustment of the pitches of the forming roll sets 40 using the handle 41 constituting the forming roll pitch adjustment means is illustrated in the drawings of the present invention, if the deceleration motor is connected to the forming roll sets in place of the handle 41, the automatic control of the pitches of the forming roll sets can be, of course, performed by the control device 80.

[40] More specifically, when the handle is turned, the nut structure 43 moves to cause a support 44 connected to the nut structure 43 to be displaced so as to laterally move a forming roll connection portion 45. Moreover, when another handle for vertical movement is turned, the forming roll connection portion can move upwardly and downwardly, i.e., vertically to adjust the pitches of the forming roll sets 40.

[41] Thus, the present invention allows only forming roll sets 40 necessary for a selected model to be arranged in a desired pitch so as to join a forming work. On the contrary, the remaining forming roll sets 40 which are not selected can be adjusted in pitches so as to be excluded from the forming work so that they can get out of a corresponding roll-forming section.

[42] The electric motor 50 is connected to the upper roll 30a of each of the pinch roll sets 30 by means of a chain so as to transfer a rotating power to the pinch roll sets. Although The embodiment of the present invention has illustrated the connection of the motor 50 to the upper roll 30a of each pinch roll set 30 by means of the chain, the connection between the motor 50 and the upper roll 30a may be, of course, achieved through other various connection means such as a belt, a gear or the like so as to transfer power to he pinch roll sets 30.

[43] The calibration roll 60 is means for calibrating the top and bottom surfaces and both lateral surfaces of all the plates in which the forming work has been completed. The calibration roll 60 conducts a final machining work to allow the plates to be formed at right angles perfectly. The cutter 70 serves to cut a finished plate into a suitable size after completion of the calibration

[44] Since the to-be-cut size of the finished plate is previously marked in the unit of length by the encoder 90, the finished plate is cut into the marked size by the cutter 70.

Since a coil plate is continuously cut into a certain size, the amount of residue and debris generated in the course of cutting the plate is significantly reduced.

[45] The control device 80 is electrically connected to the pinch roll sets 30, the forming roll sets 40, the puncher 10 and the cutter 80 so as to control the overall operation of the elements such that the drive of the pinch roll sets 30 and the operation of the forming roll sets 40 are controlled to thereby produce a desired model of window and door frames.

[46] That is, according to the present invention, it is possible to include the forming roll set 30 capable of producing all the various models of window and door frames and produce various models of window and door frames in a single machine assembly in such a fashion as to drive only forming roll sets needed for a corresponding roll- forming work, but not the remaining forming roll sets.

[47] Now, the operation method of the present invention will be described hereinafter in more detail.

[48] First, the present invention illustrates a total of six types of models, and thus users select a desired model and adjust the pitches of the forming rolls corresponding to the selected model to allow the forming rolls to be maintained in a standby state. At this time, the pitches of the forming rolls may be adjusted automatically by the deceleration motor or may be adjusted manually by the handle.

[49] When the adjustment of the pitches of the selected forming rolls has been completed, the pinch roll sets 30 are driven to transport a plate 120. Then, the plate 120 passes through the leveller 20 and then is subjected to a chamfering process in the puncher 10 to enter a first pinch roll set Xl. At this time, of course, the plate 120 is in a state of having been cut in a V-shape.

[50] Subsequently, the V-shaped cut plate is selectively bent at to-be-bent portions thereof while passing through the selected forming roll sets 40, and then passes through a seventh roll set X7 to thereby complete a desired type of model.

[51] When the desired type of model has been completed, the bent plate is calibrated to be correctly formed at right angles while passing through the calibration roll 60 and then is cut by the cutter 70 according to a length measured by the encoder 90. Thereafter, the cut plate is transported to the product rack 110 to thereby complete all the necessary machining processes.

[52] The selection and operation of the forming rolls will now be described hereinafter in more detail.

[53] In the present invention, there is shown a first process type model of a plate in FIG.

6(a). In this case, the plate is formed in a generally square cross-sectional shape which is opened at a lower side thereof and is inwardly and horizontally bent at right angles at the bottom surface thereof.

[54] The first process type model of the plate is manufactured through the forming roll sets Bl and B 2 of the second block and the forming roll sets Cl and C2 of the third block among the inventive forming roll sets.

[55] In other words, a distal end of the plate is bent at 45°through the forming roll set B 1 and is completely bent at 90°through the forming roll set B2. Then, the plate is inwardly bent at 45°at points positioned at one third and two thirds of the entire length thereof through the forming roll set Cl and is completely bent at 90° through the forming roll set C2.

[56] The forming roll set Cl is configured such that two upper and lower rolls thereof are arranged in a row to allow the distal ends of the top and bottom portions of the both rolls to be bent at 45° so as to facilitate inward bending operation of the plate at 45°. The forming roll set C2 is configured such that it is arranged at both sides to allow the plate to be finishingly bent at 90°so as to facilitate inward bending operation of the plate at 90°.

[57] In the present invention, there is shown a second process type model of a plate in

FIG. 6(b). In this case, the plate is formed in a generally square cross-sectional shape which is opened at a lower side thereof, and is inwardly horizontally bent at right angles at the bottom surface thereof and is upwardly re-bent at right angles at two opposite ends thereof.

[58] The second process type model of the plate is manufactured through the forming roll sets Bl and B2 of the second block and the forming roll sets Cl, C2, C3 and C4 of the third block.

[59] In other words, a distal end of the plate is bent at 45°through the forming roll set B 1 and is completely bent at 90°through the forming roll set B2. Then, in a state where four bent lines are formed on the entire plate, the second and third ones of the four bent lines are inwardly bent at 45°through the forming roll set Cl and then are completely bent at 90°through the forming roll set C2. Then, the first and fourth bet lines are bent at 45°through the forming roll set C3 and then are horizontally bent at right angles through the forming roll set C4 to thereby produce a plate which is upwardly bent at the opposite ends thereof perpendicularly to a horizontal bottom surface thereof.

[60] The forming roll set model C3 is configured such that the plate is inwardly bent at

45°easily, and the forming roll set model C4 is configured of a rotary roll such that the plate is bent at 90°around the outer periphery of the rotary roll.

[61] In the present invention, there is shown a third process type model of a plate in FIG.

7(a). In this case, the plate is formed in a generally square cross-sectional shape which is opened at a lower side thereof, has a groove formed on the top surface thereof and is inwardly and horizontally bent at right angles at the bottom surface thereof.

[62] The third process type model of the plate is manufactured through the forming roll

sets Al and A2 of the first block, the forming roll sets Bl and B 2 of the second block and the forming roll sets Cl and C2 of the third block among the inventive forming roll sets.

[63] In other words, the plate is formed with a groove depressed at 45°at the center of the top surface thereof through the forming roll set Al and is formed with a groove depressed at 90°at the center of the top surface thereof through the forming roll set A3.

[64] Then, a distal end of the plate is bent at 45°through the forming roll set B 1 and is completely bent at 90°through the forming roll set B2. Then, the plate is inwardly bent at 45° at two bent lines of the entire length thereof through the forming roll set Cl and is completely bent at 90°through the forming roll set C2 to thereby produce a window and door frame which has a groove formed on the top center portion thereof and is bent horizontally inwardly at two opposite lower ends thereof.

[65] In the present invention, there is shown a fourth process type model of a plate in

FIG. l(b). In this case, the plate is formed in a generally square cross-sectional shape which is opened at a lower side thereof, has a groove formed on the top surface thereof, is inwardly horizontally bent at right angles at the bottom surface thereof and is upwardly re-bent at right angles at two opposite ends thereof.

[66] The fourth process type model of the plate is manufactured through the forming roll sets Al and A3 of the first block, the forming roll sets Bl and B2 of the second block and the forming roll sets Cl, C2, C3 and C4 of the third block.

[67] In other words, the plate is formed with a groove depressed at 45°at the center of the top surface thereof through the forming roll set Al and is formed with a groove depressed at 90°at the center of the top surface thereof through the forming roll set A3.

[68] Then, a distal end of the plate is bent at 45°through the forming roll set B 1 and is completely bent at 90°through the forming roll set B2. Then, the plate is inwardly bent at 45° at two upper bent lines of the entire length thereof through the forming roll set Cl, is completely bent at 90°through the forming roll set C2, is bent at 45°at two lower bent lines of the entire length thereof through the forming roll set C3, and is inwardly horizontally bent at right angles at the bottom surface thereof and is upwardly re-bent at right angles at two opposite ends thereof through the forming roll set C4 to thereby produce a window and door frame which has a groove formed on the top center portion thereof and is bent horizontally and vertically at the bottom surface thereof.

[69] In the present invention, there is shown a fifth process type model of a plate in FIG.

8(a). In this case, the plate is formed in a generally square cross-sectional shape which is opened at a lower side thereof, has a groove formed on the top surface thereof and a right lateral surface thereof, respectively, and is inwardly horizontally bent at right angles at the bottom surface thereof.

[70] The fifth process type model of the plate is manufactured through the forming roll

sets Al, A2, A3 and A4 of the first block, the forming roll sets Bl and B 2 of the second block and the forming roll sets Cl and C2 of the third block.

[71] In other words, the plate is formed with a groove depressed at 45°at the center of the top surface thereof through the forming roll set Al, is formed with a groove depressed at 45°on one lateral surface thereof through the forming roll set A2, is formed with a groove depressed at 90°at the center of the top surface thereof through the forming roll set A3, is formed with a groove depressed at 90°on the one lateral surface thereof through the forming roll set A4.

[72] Then, a distal end of the plate is bent at 45°through the forming roll set B 1 and is completely bent at 90°through the forming roll set B2. Then, the plate is inwardly bent at 45° at two bent lines of the entire length thereof through the forming roll set Cl and is completely bent at 90°through the forming roll set C2 to thereby produce a window and door frame which has a groove formed on the top center portion thereof and one later surface thereof, respectively, and is bent horizontally inwardly at two opposite lower ends thereof.

[73] In the present invention, there is shown a sixth process type model of a plate in FIG.

8(b). In this case, the plate is formed in a generally square cross-sectional shape which is opened at a lower side thereof, has a groove formed on the top surface thereof and the bottom surface thereof, respectively.

[74] The sixth process type model of the plate is manufactured through the forming roll sets Al and A3 of the first block, the forming roll sets Bl, B2, B 3 and B4 of the second block and the forming roll sets Cl, C2, C3 and C4 of the third block.

[75] In other words, the plate is formed with a groove depressed at 45°at the center of the top surface thereof through the forming roll set Al and is formed with a groove depressed at 90°at the center of the top surface thereof through the forming roll set A3.

[76] Then, a distal end of the plate is bent at 45°through the forming roll set B 1 and is completely bent at 90°through the forming roll set B2. Then, the distal end of the plate is outwardly re-bent at 45°through the forming roll set B 3 and is horizontally bent at 90°through the forming roll set B4 to thereby form a horizontal and vertical plane.

[77] In addition, in a state where four bent lines are formed on the entire plate, the plate is inwardly bent at 45°at two upper bent lines of the entire length thereof through the forming roll set Cl, is completely bent at 90°through the forming roll set C2, is bent at 45°at two lower bent lines of the entire length thereof through the forming roll set C3, and is inwardly horizontally bent at right angles at the bottom surface thereof and is upwardly re-bent at right angles at two opposite ends thereof through the forming roll set C4 to thereby produce a window and door frame which has a groove formed on the top and bottom center portion thereof.

[78] In the foregoing, six process type models have been illustrated, but various process

type models may be, of course, configured other than those models. Industrial Applicability

[79] As described above, the present invention has an advantageous effect in that it includes pinch roll sets and forming roll sets in a series of working spaces, and a puncher and a cutter are properly disposed at the front and rear of the pinch roll sets and the forming roll sets so that all the various window and door frames can be manufactured in a single line.

[80] While the invention has been in detail described in connection with what is presently considered to be preferred practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. But, it is to be noted that this design modification should be interpreted as falling within the scope of the present invention as long as a new effect does not appear which is not expected in the present invention due to the design modification.