BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an external perspective view of a blade member bending apparatus showing an embodiment of the invention.
FIG. 2 is a transparent view showing the internal structure of the blade member bending apparatus of FIG. 1.
FIG. 3 is a transverse sectional plan view of the blade member bending apparatus of FIG. 1.
FIG. 4 is a side view of the blade member bending apparatus of FIG. 1.
FIG. 5 is a side view showing a state where a thickness-direction bending die portion is tilted in correspondence to FIG. 4.
FIG. 6 is an external perspective view of a width-direction bending die portion and the thickness-direction bending die portion.
FIG. 7 is a longitudinal sectional side view of the width-direction bending die portion and the thickness-direction bending die portion.
FIG. 8 is a sectional view taken along the line A-A of FIG. 7.
FIG. 9 is a front view of the width-direction bending die portion.
FIG. 10 is a sectional view taken along the line B-B of FIG. 9.
FIG. 11 is a side view of the width-direction bending die portion of FIG. 9.
FIG. 12 is a perspective view of the width-direction bending die portion of FIG. 9.
FIG. 13 is an operation diagram of the width-direction bending die portion.
FIG. 14 is a plan view of a rotary press cylinder.
FIG. 15 is a front view of the rotary press cylinder.
FIG. 16 is a side view of the rotary press cylinder.
FIG. 17 is a perspective view of the rotary press cylinder.
FIG. 18 is a plan view of a thickness-direction bending shaft of the thickness-direction bending die portion.
FIG. 19 is a sectional view taken along the line C-C of FIG. 18.
FIG. 20 is a plan view of the thickness-direction bending shaft of the thickness-direction bending die portion.
FIG. 21 is a sectional view taken along the line D-D of FIG. 20.
FIG. 22 is a perspective view of the thickness-direction bending shaft of the thickness-direction bending die portion.
FIG. 23 is an exploded perspective view of the blade member bending apparatus of FIG. 1.
FIGS. 24A and 24B are front views of a pair of rotary press claws of the thickness-direction bending die portion, FIG. 24A shows a state where the pair of rotary press claws separate from each other, and FIG. 24B shows a state where the pair of rotary press claws approach each other to compress a blade member.
FIGS. 25A and 25B are front views of a pair of rotary press claws in another embodiment, FIG. 25A shows a state where the pair of rotary press claws separate from each other, and FIG. 25B shows a state where the pair of rotary press claws approach each other to compress a blade member.
FIG. 26 is a side view of a blade member which is bent in the width direction.
FIG. 27 is a side view of a state where a blade member in the other embodiment is bent in the width direction.
FIG. 28 is a side view of a state where a blade member in a further embodiment is bent in the width direction.
FIGS. 29A and 29B are transverse sectional plan views of the width-direction bending die portion and the thickness-direction bending die portion, FIG. 29A shows a state before the blade member is bent in the thickness direction, and FIG. 29B shows a state after the blade member is bent in the thickness direction.
FIG. 30 is a transverse sectional plan view of the width-direction bending die portion and the thickness-direction bending die portion, showing a state where the blade member in the other embodiment is bent in the thickness direction.
FIG. 31 is a plan view showing another example of the blade member which is bent in the thickness direction.
FIG. 32 is a transverse sectional plan view showing a width-direction bending die portion in the other embodiment in correspondence to FIG. 10.
FIG. 33 is a transverse sectional plan view of a blade member bending apparatus of the other embodiment.
FIG. 34 is a transverse sectional plan view of a blade member bending apparatus of a further embodiment.
FIG. 35 is a transverse sectional plan view of a blade member bending apparatus of a still further embodiment.
FIG. 36 is a perspective view showing a use state of a rotary die.
FIG. 37 is a side view showing the use state of the rotary die.
FIG. 38 is a perspective view showing a blade member before the width-direction bending process.
FIG. 39 is a perspective view showing the blade member during the width-direction bending process.
FIG. 40 is a perspective view showing the blade member after the width-direction bending process.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 is an external perspective view of a blade member bending apparatus showing an embodiment of the invention, FIG. 2 is a transparent view showing the internal structure of the blade member bending apparatus, FIG. 3 is a transverse sectional plan view of the blade member bending apparatus, and FIG. 4 is a side view of the blade member bending apparatus.
In the blade member bending apparatus, as shown in FIGS. 1 to 4, a working table 3 is disposed on a chassis 2, and a blade member feeding portion 4 and a working die portion 5 are disposed on the working table 3. The blade member feeding portion 4 comprises a pair of blade member feeding rollers 6, 7 which are placed on both sides across a strip-like blade member 1 having a blade edge 12 in one end edge in the width direction. The pair of blade member feeding rollers 6, 7 are intermittently rotated in opposite directions by a blade member feeding motor 8, whereby the blade member 1 is intermittently fed to the working die portion 5 with directing the blade edge 12 upward.
As shown in FIGS. 6 to 8, the working die portion 5 comprises: a width-direction bending die portion 9 which bends the blade member in the width direction; and a thickness-direction bending die portion 10 which, after the width-direction bending process, bends the blade member in the thickness direction. The width-direction bending die portion 9, and the thickness-direction bending die portion 10 are concentrically placed.
As shown in FIGS. 9 to 13, the width-direction bending die portion 9 comprises a pair of rotary press claws 13, 14 which are placed on both sides across the blade member 1 in a manner that they are relatively rotatable in opposite directions. The rotary press claws 13, 14 comprise tip end edges 13a, 14a extending along the width direction of the blade member 1, respectively, and are formed so as to have a V-like section shape. The rotary press claws are attached to a pair of rotary press driving shaft 15 and rotary press driven shaft 16 which are opposed in a vertical posture to each other on both sides across the blade member 1 in a manner that the rotary press claws are rotatable in opposite directions, so that their tip end edges 13a, 14a are projected to outsides of the shafts, respectively. The rotary press driving shaft 15 and the rotary press driven shaft 16 are housed in a rotary press cylinder 17 shown in FIGS. 15 to 17, in a state shown in FIGS. 6 to 8. In FIGS. 15 to 17, in an intermediate portion in the height direction of the rotary press cylinder 17, blade member passing holes 18, 18 which allow the blade member 1 to pass therethrough are formed at places which are symmetric about the axis of the cylinder 17. As shown in FIG. 8, the blade member passing holes 18, 18 communicate with a gap between the rotary press driving shaft 15 and the rotary press driven shaft 16. As shown in FIGS. 1 and 23, the upper and lower ends of the rotary press cylinder 17 are held to the working table 3 by cylinder holders 19, 20, whereby the rotary press cylinder is attached in a vertical posture.
As shown in FIG. 6, the rotary press driving shaft 15 and the rotary press driven shaft 16 are disposed so that they are relatively rotated in opposite directions in the rotary press cylinder 17 by a rotary press claw driving mechanism 21. In the rotary press claw driving mechanism 21, sector drive gears 22, 23 are fixed respectively to the upper and lower ends of the rotary press driving shaft 15 and rotary press driven shaft 16 which are projected from the upper and lower ends of the rotary press cylinder 17. Drive pinions 26, 27 are fixed respectively to the upper and lower ends of driving and driven shafts 24, 25 so that adjacent ones of the drive pinions 26, 27 mesh with each other. The drive pinions 26, 27 mesh with the drive gears 22, 23, respectively. As shown in FIGS. 2 and 4, the lower end of the driving shaft 24 is coupled via a coupling 30 to a rotation shaft 29 of a forward and rearward drive motor 28 for a width-direction bending process. As a result, by the driving of the forward and rearward drive motor 28, the rotary press driving shaft 15 and the rotary press driven shaft 16 are rotated relatively forwardly and relatively rearwardly in opposite directions in the rotary press cylinder 17.
As shown in FIGS. 24A and 24B, the pair of rotary press claws 13, 14 are placed so that their respective tip end edges 13a, 14a are opposed to each other, and the blade member 1 is fed between the edges with directing the blade edge 12 upward. As described above, the tip end edges 13a, 14a have a shape extending along the width direction of the blade member 1, and are formed so as to have a V-like section shape.
As seen from FIG. 24B, in a state where the tip end edges 13a, 14a of the pair of rotary press claws 13, 14 clamp the blade member 1 which is fed in a vertical posture between the edges with directing the blade edge 12 upward, the tip end edges 13a, 14a are tilted in a downward flare-like manner with respect to vertical side faces 11, 11 of the blade member 1. In the illustrated example, the tilting angle θ1 of the tip end edge 13a of the one rotary press claw 13 with respect to the side face 11 of the blade member 1, and the tilting angle θ2 of the tip end edge 14a of the other rotary press claw 14 are set to be equal to each other. However, it may be contemplated that the tilting angles θ1 and θ2 are different from each other.
Next, a method of bending the blade member 1 in the width direction by using the thus configured width-direction bending die portion 9 will be described.
In a state where the blade member 1 is clamped from the both sides by the pair of blade member feeding rollers 6, 7 of the blade member feeding portion 4, the pair of blade member feeding rollers 6, 7 are intermittently rotated to intermittently feed the blade member 1 to the width-direction bending die portion 9 with directing the blade edge 12 upward. During stoppage of the process of feeding the blade member 1, the pair of rotary press claws 13, 14 approach and separate from each other one time or a required number of times.
In a state where the tip end edges 13a, 14a of the rotary press claws 13, 14 separate from each other as shown in FIG. 24A, the blade member 1 is fed in a vertical posture between the edges with directing the blade edge 12 upward, and then the forward and rearward drive motor 28 for the width-direction bending process starts to operate, thereby causing the tip end edges 13a, 14a of the rotary press claws 13, 14 to approach each other. As a result, as indicated by the arrow F in FIG. 24B, the tip end edges 13a, 14a of the rotary press claws 13, 14 are pressed against the side faces 11, 11 of the blade member 1. Therefore, the blade member 1 is clamped by the pair of rotary press claws 13, 14 to be compressed in the thickness direction, and extended in the longitudinal direction of the blade member 1 in accordance with the compression amount, so as to be bent in the width direction. The above is a width-direction bending step. As shown in FIG. 26, press marks N1, N2, . . . of the tip end edges 13a, 14a linearly remain at the number of which is equal to the number of repeated pressing operations. In FIG. 24B, the maximum compression amount of the blade member 1 which is compressed by pressing of the tip end edge 14a of the one rotary press claw 14, i.e., the maximum amount of reduction of the thickness of the blade member 1 which is caused by the compression is indicated by the letter d.
The tip end edges 13a, 14a are tilted in a downward flare-like manner with respect to side faces 11, 11 of the blade member 1. In the width-direction bending step, therefore, the compression amount in the compressed portion of the blade member 1 is gradually increased as advancing toward one end edge (the blade edge 12) in the width direction. Consequently, the extension length of a portion of the blade member 1 due to the compression is longer as the portion is closer to the blade edge 12, and is shorter as the portion is remoter from the blade edge 12. Along with the extension of the compressed portion which is closest to the blade edge 12, the blade edge 12 is extended by a substantially same length. Therefore, the compressed portion is bent into a curved shape in which the blade edge 12 of the blade member 1 is swollen in the width direction as shown in FIG. 26.
When the compression amount of the blade member 1 due to the tip end edges 13a, 14a is adequately adjustedly increased or decreased, or the pitch of compressed portions is adequately adjustedly lengthened or shortened, the bending degree of the blade member 1 in the width direction can be changed. Therefore, the radius of curvature P (see FIG. 5) of the blade member 1 which is bent in the width direction can be freely adjusted.
The blade member 1 is clampingly pressed by the tip end edges 13a, 14a of the rotary press claws 13, 14 to be compressed. Therefore, the pressing force due to the tip end edges 13a, 14a is efficiently concentrated to the compressed portion of the blade member 1 to efficiently perform the bending process on the blade member 1 in the width direction.
By the bending process in the width direction, as shown in, for example, FIG. 39, a range of the blade member 1 from one end portion to an intermediate portion can be bent in the width direction. It is a matter of course that the bending process in the width direction is enabled in either of the blade member 1 in which, as shown in FIG. 27, long slit-like notches 56 are formed in the other end edge in the width direction of the blade member 1 in the longitudinal direction of the blade member 1 at predetermined intervals, or that in which such notches are not formed as shown in FIG. 26. In FIG. 26, the blade edge 12 is formed into an undulated pattern in order that the blade member 1 to be bent can be used in formation of perforations in a work. Alternatively, the embodiment can be applied also to the blade member 1 in which the blade edge 12 is formed into a straight shape instead of an undulated pattern.
Next, the configuration of the thickness-direction bending die portion 10 will be described.
As shown in FIGS. 6 to 8, the thickness-direction bending die portion 10 is concentrically incorporated into the width-direction bending die portion 9. The thickness-direction bending die portion 10 is configured by a thickness-direction bending shaft 31, and a thickness-direction bending cylinder 32 which is fitted in a turning paired state onto the thickness-direction bending shaft 31.
As shown in FIGS. 18 to 22, the thickness-direction bending shaft 31 is formed into a cylindrical shape, and the rotary press cylinder 17 into which the pair of rotary press driving shaft 15 and rotary press driven shaft 16 are housed is inserted into the thickness-direction bending shaft 31 as shown in FIGS. 7 and 8. In other words, the thickness-direction bending shaft 31 is fitted concentrically and in a locked state onto the rotary press cylinder 17. Blade member passing holes 33, 33 which allow the blade member 1 to pass therethrough are penetratingly formed in the thickness-direction bending shaft 31 in a direction perpendicular to the axis of the thickness-direction bending shaft 31. The thickness-direction bending shaft 31 is fitted concentrically and in a locked state onto the rotary press cylinder 17 in a manner that the blade member passing holes 33, 33 communicate with the blade member passing holes 18, 18 of the rotary press cylinder 17.
In FIGS. 6 to 8, in the thickness-direction bending cylinder 32 which is fitted onto the thickness-direction bending shaft 31, first and second openings 34, 35 are formed at places which are symmetric about the axis. The first and second openings 34, 35 are formed so as to be opposed to the blade member passing holes 33, 33 of the thickness-direction bending shaft 31, and have a size larger than opening size of the blade member passing holes 33. A predetermined gap 36 (see FIG. 8) is disposed between the outer peripheral faces of outlet forming portions of the blade member passing holes 33 in the thickness-direction bending shaft 31, and the inner peripheral face of a first-opening forming portion in the thickness-direction bending cylinder 32. The thickness-direction bending shaft 31 and the thickness-direction bending cylinder 32 are relatively rotated, whereby the blade member 1 which is passed from the blade member passing hole 33 to the first opening 34 via the second opening 35 is bent in the thickness direction.
As shown in FIGS. 2 and 4, the thickness-direction bending cylinder 32 is forwardly or rearwardly rotated by a rotary driving mechanism 38 for the thickness-direction bending cylinder 32 and including a forward and rearward drive motor 37 for a thickness-direction bending process. In the rotary driving mechanism 38, the lower end of a driving shaft 41 in which a driving pinion 40 is fixed to the upper end is coupled via a coupling 42 to a rotation shaft 39 of the forward and rearward drive motor 37, a driven gear 43 is fitted and fixed onto the lower end of the thickness-direction bending cylinder 32, and the driven gear 43 meshes with the driving pinion 40. By driving of the forward and rearward drive motor 37, the thickness-direction bending cylinder 32 is forwardly or rearwardly rotated via the driving pinion 40 and the driven gear 43.
As shown in FIGS. 1 to 4, and 23, the thickness-direction bending die portion 10 comprising the thickness-direction bending shaft 31, the thickness-direction bending cylinder 32, and the thickness-direction bending-shaft rotary driving mechanism 38 is attached to a mounting table 44 which is separate from the chassis 2. In this case, the upper end of the thickness-direction bending shaft 31 is fixed to a cutaway portion 45 (see FIG. 23) of the mounting table 44 by a bent-shaft upper portion holder 46 (see FIG. 23), and the lower end is fitted and fixed into a mounting hole 47 (see FIG. 23) which is opened in the mounting table 44, by a bent-shaft lower portion holder 48 (see FIG. 23). As shown in FIGS. 1 and 4, the driving pinion 40 is placed on the mounting table 44, and the forward and rearward drive motor 37 is attached to the mounting table 44 in a suspended state.
The thickness-direction bending die portion 10 is disposed together with the mounting table 44 in a tiltable manner by a tilting driving mechanism 49 (see FIGS. 4 and 5) so that the tilting angle with respect to the blade member 1 can be changed in accordance with the curvature of the blade member 1 which is bent in the width direction by the width-direction bending die portion 9.
As shown in FIG. 17, therefore, a pair of support shafts 50 are disposed in an intermediate portion in the height direction of the outer periphery of the rotary press cylinder 17 of the width-direction bending die portion 9, so as to be projected in a direction perpendicular to the blade member passing holes 18. As a result, as shown in FIGS. 5 and 7, the thickness-direction bending shaft 31 of the thickness-direction bending die portion 10 is fitted onto the rotary press cylinder 17 so as to be swingable about the support shafts 50. As shown in FIGS. 7 and 19, the internal shape of the thickness-direction bending shaft 31 is formed into a shape in which, when the thickness-direction bending shaft 31 is swung about the support shafts 50 outside the rotary press cylinder 17, the inside of the thickness-direction bending shaft 31 does not interfere with the side face of the rotary press cylinder 17 to impede the swing operation. In the internal shape of the thickness-direction bending shaft 31, namely, as shown in FIGS. 7 and 19, a portion 51a which is above the support-shaft receiving portion 51 is formed in a upward-flared shape so as to be larger than the outer diameter of the rotary press cylinder 17, and a portion 51b which is below a support-shaft receiving portion 51 is formed in a downward-flared shape so as to be larger than the outer diameter of the rotary press cylinder 17. In the inner face of the thickness-direction bending shaft 31, grooves 52, 52 which are downward opened are disposed at places which are symmetric about the axis of the thickness-direction bending shaft 31 and in parallel to the axis, and the support-shaft receiving portions 51 are disposed on the upper ends of the grooves 52, 52. When the thickness-direction bending shaft 31 is to be incorporated into the rotary press cylinder 17, the rotary press cylinder 17 comprising the support shafts 50, 50 is inserted from the lower side into the thickness-direction bending shaft 31 so that the support shafts 50, 50 are inserted along the grooves 52, 52.
In the tilting driving mechanism 49 which tilts the thickness-direction bending die portion 10, as shown in FIGS. 3 and 4, a pair of tilting drive gears 53, 53 are attached to the mounting table 44, and a forward and rearward drive motor 54, and a pair of transmission gears 55, 55 which are rotated by the forward and rearward drive motor 54 via intermediate transmission gears 57 are attached onto the working table 3 of the chassis 2. The transmission gears 55, 55 mesh with the tilting drive gears 53, 53. According to the configuration, by driving of the forward and rearward drive motor 54, the thickness-direction bending die portion 10 is swung together with the mounting table 44 about the support shafts 50 via the transmission gears 55 and the drive gears 53, and the tilting angle with respect to the blade member can be changed.
Next, a method of bending the blade member 1 in the thickness direction by using the thus configured thickness-direction bending die portion 10 will be described with reference to FIGS. 29A and 29b.
In an initial stage of the bending process, as shown in FIG. 29A, the first and second openings 34, 35 of the thickness-direction bending cylinder 32 are opposed to outlet and inlet opening ends of the blade member passing hole 33 of the thickness-direction bending shaft 31. In this state, the blade member 1 is fed between the rotary press claws 13, 14 of the width-direction bending die portion 9 through the second opening 35 of the thickness-direction bending cylinder 32, and the inlet opening end of the blade member passing hole 33, and then bent in the width direction as described above.
When a tip end portion of the blade member 1 which has been bent in the width direction in the width-direction bending die portion 9 is projected by a predetermined projection amount from the outlet opening end of the blade member passing hole 33, the blade member feeding operation by the blade member feeding portion 4 is stopped. In this state, the forward and rearward drive motor 37 of the bending-shaft rotary driving mechanism 38 is forwardly driven by a predetermined angle, and, as shown in FIG. 29B, the thickness-direction bending cylinder 32 is relatively rotated in one direction (counterclockwise direction) J with respect the thickness-direction bending shaft 31. When the rotation angle reaches a preset angle, the forward rotation of the forward and rearward drive motor 37 is stopped. As a result, as shown in FIG. 29B, the blade member 1 is bent in the thickness direction by a predetermined bending angle. Thereafter, the forward and rearward drive motor 37 is rearwardly rotated, and the thickness-direction bending cylinder 32 returns to its initial position to be stopped. The above is a thickness-direction bending step. In a procedure similar to that of the above-described bending step, thereafter, the blade member is bent in the thickness direction. When the blade member 1 is to be bent in a thickness direction opposite to the above-described thickness direction, the forward and rearward drive motor 37 is rearwardly driven as shown in FIG. 30, and the thickness-direction bending cylinder 32 is relatively rotated in the other direction (clockwise direction) K with respect the thickness-direction bending shaft 31.
When the thickness-direction bending process is repeated while the blade member 1 is intermittently fed by a small pitch, the blade member can be bent in the thickness direction into arcuate curves P1, P2, P3 as shown in FIG. 31.
By the thickness-direction bending process, as shown in FIG. 38, the blade member 1 can be bent into a substantially rectangular shape in a plan view.
In the process of bending a blade member in the thickness direction, in advance of the process, the thickness-direction bending die portion 10 is swung about the support shafts 50 by driving of the forward and rearward drive motor 54 of the tilting driving mechanism 49 to set the tilting angle with respect to the blade member 1 to a predetermined angle, whereby, as shown in FIG. 5, the thickness-direction bending die portion 10 can be tilted to the predetermined angle so as to coincide with the curvature (1/ρ) of the blade member 1 which has been bent in the width direction in the width-direction bending die portion 9. In FIG. 5, ρ indicates the distance from the center O of a partial arc of the blade member 1 which has been bent in the width direction, to the center line in the width direction of the blade member 1, i.e., the radius of curvature.
In the embodiment, as the width-direction bending die portion 9, the configuration in which, as shown in FIGS. 24A and 24B, the tip end edges 13a, 14a of the pair of rotary press claws 13, 14 are tilted so that the compression amount of the blade member 1 is gradually increased as advancing toward one end edge (the blade edge 12) in the width direction of the blade member is employed. Alternatively, a configuration in which, as shown in FIGS. 25A and 25B, the tip end edges are tilted so that the compression amount is gradually increased as advancing toward the other end edge in the width direction of the blade member 1 may be employed. When the blade member 1 is bent in the width direction by the rotary press claws 13, 14 in which the tip end edges are tilted so that the compression amount is gradually increased as advancing toward the other end edge in the width direction of the blade member 1, the compressed portion can be worked into a curved shape in which the other end edge in the width direction of the blade member 1 is swollen in the width direction as shown in FIG. 28.
In the width-direction bending die portion 9, the pair of rotary press claws 13, 14 in which, as shown in FIGS. 24A and 24B, the tip end edges 13a, 14a are tilted so that the compression amount is gradually increased as advancing toward one end edge (the blade edge 12) in the width direction of the blade member 1, and the pair of rotary press claws 13, 14 in which, as shown in FIGS. 25A and 25B, the tip end edges 13a, 14a are tilted so that the compression amount is gradually increased as advancing toward the other end edge in the width direction of the blade member 1 may be attached to the same rotary press driving shaft 15 and rotary press driven shaft 16 as shown in FIG. 32. In this case, the former rotary press claws 13, 14 (indicated by the letter M in FIG. 32) are caused to approach each other by relative forward rotation (in the direction of the arrow Q in FIG. 32) of the rotary press driving shaft 15 and the rotary press driven shaft 16, and, by contrast, the latter rotary press claws 13, 14 (indicated by the letter N in FIG. 32) are caused to approach each other by relative rearward rotation (in the direction of the arrow R in FIG. 32) of the rotary press driving shaft 15 and the rotary press driven shaft 16.
In the embodiment, the thickness-direction bending die portion 10 is concentrically incorporated into the width-direction bending die portion 9 so that the whole bending apparatus can be compacted and miniaturized while allowing the blade member 1 to be succeedingly bent in the thickness direction after being bent in the width direction. Alternatively, as shown in FIG. 33, the thickness-direction bending die portion 10 may be juxtaposed with a downstream side of the width-direction bending die portion 9 in the blade member feeding direction. Also in this configuration, after the blade member 1 is bent in the width direction, the bending process in the thickness direction can be succeedingly performed.
In the width-direction bending die portion 9, as shown in FIG. 34, the rotary press driving shaft 15 and rotary press driven shaft 16 to which the pair of rotary press claws 13, 14 that are tilted so that the compression amount is gradually increased as advancing toward one end edge (the blade edge 12) in the width direction of the blade member 1 are attached, and the rotary press driving shaft 15 and rotary press driven shaft 16 to which the pair of rotary press claws 13, 14 that are tilted so that the compression amount is gradually increased as advancing toward the other end edge in the width direction of the blade member 1 are attached may be juxtaposed in the blade member feeding direction.
As shown in FIG. 35, the width-direction bending die portion 9 which is configured by attaching the pair of rotary press claws 13, 14 (indicated by the letter M in FIG. 35) that are tilted so that the compression amount is gradually increased as advancing toward one end edge (the blade edge 12) in the width direction of the blade member 1, and the pair of rotary press claws 13, 14 (indicated by the letter N in FIG. 35) that are tilted so that the compression amount is gradually increased as advancing toward the other end edge in the width direction of the blade member 1, to the same rotary press driving shaft 15 and the rotary press driven shaft 16 may be juxtaposed with the upstream side of the thickness-direction bending die portion 10 in the blade member feeding direction.
In the embodiment, the operation timings and amounts of the blade member feeding motor 8, the forward and rearward drive motor 28 for the width-direction bending process, the forward and rearward drive motor 37 for the thickness-direction bending process, and the forward and rearward drive motor 54 of the tilting driving mechanism 49 are controlled by a computer. A program corresponding to the final bent shape of the blade member 1 is prepared, and the computer supplies a signal based on a command of the program, to the motors.
Patent Application
20070283737
