JP2591416B2 - Die changing device for sheet bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die changing apparatus for a sheet bending machine, for example, a folding machine, a press brake, etc., which can change a die width in accordance with a bending width of the plate.

[0002]

2. Description of the Related Art In cabinets and the like of electric equipment and various other products, a rectangular plate obtained by bending four sides into a U shape or a Z shape is used. In order to bend the plate material in this manner, usually, after bending the short side edge portion of the plate material cut into a predetermined size, the plate material is turned in a plane to bend the long side edge portion. When bending the long side edge, there is a rising piece on the short side edge that has already been bent, so if there is a change in the plate material dimensions, the upper mold must be wide enough to not interfere with the rising piece. The width needs to be changed.

Conventionally, as a mold changing apparatus which automatically changes the die width of the upper die, the upper die is composed of a number of split dies arranged in the width direction of the die, and an arbitrary number of split dies are used. Various proposals have been made for selecting and arranging them at use positions. For example, there is a type in which a plurality of thin-walled dies are provided at the center, and thick-walled dies are provided on both sides thereof, and the width of the upper die is changed by selecting the number of the thin-walled and thick-walled dies.

[0004]

However, in any of the mold changing apparatuses, a mechanism and a control system for selecting a split mold have a complicated structure, and a large number of expensive servomotors are required. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a die changing apparatus for a sheet bending machine capable of selecting the number of thin-walled split molds with a simple configuration without requiring expensive driving parts such as a servomotor. is there.

[0006]

According to the present invention, there is provided a die exchanging apparatus for a sheet material bending machine, wherein a part of an upper die is constituted by a plurality of thin-walled split dies arranged in the width direction of the die. The rotary shaft for raising is installed so as to be rotatable between a use position and a jumping position. The rotating shaft for jumping up and the thin-walled split mold are selected for mold selection.
For this purpose, the thin-walled split mold is engaged with the thin-walled split mold in the rotational direction by a mold number selectable key movable in the axial direction. The mold number selection key is capable of moving forward and backward with a feed screw that moves forward and backward by the thickness of one thin-walled mold in one rotation of the motor.
Ru provided a rotational detector for detecting the phase.

According to a second aspect of the present invention, there is provided a mold exchanging device having an elastic locking mechanism which elastically engages with the thin-walled split mold at the flip-up position.
This is to prevent the downward rotation of the thin-walled split type.

[0008]

According to this construction, by rotating the rotary shaft for jumping, only the thin-walled split type engaged with the die number selection key is rotated together with the rotary shaft for jumping-up, and the number of sheets used for the thin-walled split type is selected. You. The number-of-molds selection key is moved forward and backward by the rotation of the motor via the feed screw, and the number of sheets engaged with the thin-walled split mold changes. In this case, the lead screw is
Since the lead is used to move the number-of-parts selection key for one thin-walled split type by rotation, the control system of the motor only needs to be capable of recognizing one rotation, and does not require an expensive servomotor.

In the case of the second aspect, the unnecessary thin-walled split mold is held by the elastic locking mechanism at the jumping position, and only the thin-walled split mold selected by the mold number selection key is rotated downward to the use position. . As described above, since the unnecessary thin-walled split mold can be held at the flip-up position by the elastic locking mechanism, a mechanism for holding the unnecessary thin-walled split mold at the flip-up position is used in a mechanism for rotating the thin-walled split mold. There is no need to provide them, and the configuration for selecting the number of molds is simplified.

[0010]

An embodiment of the present invention will be described with reference to FIGS. As shown in the side view of FIG. 3, the bending machine main body 1 of the plate material bending machine includes an upper mold 2 and a lower mold 3 that vertically sandwich the plate material W, and protruding portions of the plate material W from the upper and lower molds 2 and 3. W1
Is bent upward or downward. The lower mold 3 is fixed to the main body frame 5. Upper mold 2
Is attached to a ram 7 via a mold changing device base (hereinafter, referred to as an “ATC base”) 6 and a lifting cylinder 8
Is driven up and down together with the ram 7. The bending die 4 is attached to the tip of the rocker arm 9. The rocker arm 9 is supported swingably up and down around an eccentric support shaft 10,
The vertical drive cylinder and the cylinder for rotating the eccentric support shaft 10 (both not shown) enable vertical swing, slight vertical movement, and forward / backward movement. The die width of the upper die 2 can be freely changed by the die changing device 11.

In front of the folding machine main body 1, there is provided a plate feeding device 13 for holding the center of the plate W between upper and lower dies 2 and 3 while holding the center of the plate W between upper and lower rotary pads. The rotary clamp 12 is for indexing and rotating the plate material W in a horizontal plane, and is provided on a carriage 15 that is driven forward and backward on a rail 14 in FIG. On both sides of the forward and backward movement path of the carriage 15, work tables 16 on which the plate material W sandwiched by the rotary clamps 12 are placed.

The configuration of the mold changing apparatus 11 will be described. FIG.
As shown in the figure, the upper mold 2 has a central mold 17 arranged at the center in the mold width direction, a plurality of thick molds 18 arranged on both sides thereof, and a thin mold 19 arranged on both sides thereof.
And an end mold 20 at both ends. Central type 17
Is composed of a pair of divided central dies 17a and 17b, and a thin central die 17c interposed between them so as to be able to enter and exit. An open mold 21 is attached to the end mold 20 so as to be rotatable around a support shaft 22. The opening mold 22 normally hangs down in an inclined posture as shown by a chain line, and spreads laterally at a horizontal angle as shown by a solid line when the plate material W is pressed. Each thick-walled split mold 18
In this embodiment, the thickness is 50 mm. Thin-wall split type 1
9 is formed to a thickness of 5 mm, which is 1/10 of the thickness, and 9 sheets are provided on one side. The thin center mold 17c is also formed to have the same thickness of 5 mm as the thin split mold 19.

The thick split dies 18 each have a guide roller 23 at the upper end, and are movably suspended in a split width direction on a split die support rail 24 provided on the ATC base 6 of the ram 7. The split type support rail 24 and the guide roller 23 constitute a split type guide mechanism 29. Each thick split type 18
A pin engagement hole 25 for moving operation is provided on the front surface of the.

The end mold 20 and the thin-walled split mold 19 are installed on a mold setting slide 26 via a jumping-up mechanism 27. The mold setting slide 26 is attached to a lower rail 28 provided on the ATC base 6. It is installed to be able to advance and retreat in the mold width direction via a linear motion bearing. A mold coupling mechanism 30 for coupling with the thick-walled split mold 18 is provided at the center end of the mold installation slide body 26.
Is provided via a support 31, and an unnecessary type movement prevention device 40 is provided on the opposite side.

The mold connecting mechanism 30 drives a connecting pin 32 (FIG. 7) inserted into and removed from the pin engaging hole 25 of the thick-walled split mold 18 by an air cylinder 33. The unnecessary-type movement prevention device 40 is a device that presses the mold 18 at the inner end of the row of the thick-walled split molds 18 located at the side standby position T to prevent movement.
It is composed of a pressing pad 40a (FIG. 4) made of urethane or the like and a pressing thinner 40b.

In FIG. 2, the mold setting slide 26 is
A U-axis servomotor 3 is connected via a pin joint 36 to an advancing / retracting moving member 35 driven by a feed screw 34.
By the rotation of 7, the reciprocating drive is performed together with the reciprocating moving member 35. The reciprocating member 35 is supported by an upper guide rail 38 provided on the ram 7 via a linear bearing so as to be able to reciprocate freely.
The feed nut 34 is screwed with a ball nut 39. The feed screw 34 is rotatably supported on the ram 7 by a bearing, and both side portions 34a and 34b with respect to the center of the mold width are formed in opposite threads, and are rotationally driven by the U-axis servomotor 37 via the timing belt 41. Is done. Therefore, the mold mounting slides 26 on both sides are driven far and near in synchronization with each other. The end-type moving mechanism 4 is composed of the mold-mounting slide body 26, the advance / retreat moving member 35, and the pin joint 36.
3 are configured.

The pin joint 36 is formed by engaging a joint pin 36a with an engagement groove 42a in the front-rear direction of a non-engagement member 42 (FIG. 4) provided on the mold installation slide body 26. Between the pin 36a and the engaging groove 42a, the feed screw 3 for adjusting the protrusion (front-back position) of the cutting edge 2a of the upper die 2 is provided.
4 is absorbed in the front and rear directions (in the direction of arrow d), and the smooth movement of the mold installation slide body 26 is ensured.

FIG. 5 shows the structure of the lifting mechanism 27. A hollow flip-up rotary shaft 45 is rotatably supported by a bearing 46 on the mold mounting slide body 26 via a pair of supports 31 and 44, and a driven gear 47 is fixed to one end thereof. The driven gear 47 meshes with a drive gear 50 of a jump drive 49 (FIG. 4) via an idle gear 48, and the drive of the jump drive 49 causes the jump rotary shaft 45 to rotate forward or backward at a predetermined angle. Rotated. As shown in FIG. 5, the upper end of the end mold 20 and each of the thin-walled split molds 19 are rotatably fitted to the flip-up rotary shaft 45. The end mold 20 and each of the thin split molds 19 are engaged with the flip-up rotary shaft 45 via the mold number selection key 51 so as to be capable of transmitting rotation.

The number-of-moulds selection key 51 is
The nut 51a is screwed into the feed screw 52 in the nut 5 so that the nut 51a can move forward and backward.
5 and engages with the key grooves of the end mold 20 and each of the thin-walled split molds 19. Feed screw 52
Is rotatably supported by a bearing 54 in a rotary shaft 45 for jumping up, and is connected via a shaft coupling 56 to a motor 55 for jumping up installed on the mold installation slide 26.

Therefore, the number of the thin-walled split molds 19 to be engaged with the key 51 is selected by rotating the jumping motor 55 to move the mold number selection key 51 forward and backward. The engaged thin-walled split mold 19 and end mold 20 are turned 180 ° between the use position P and the jump position Q in FIG. The lead of the feed screw 52 (FIG. 5) is set to a size such that the mold number selection key 51 moves by one thickness of the thin-walled split mold 19 in one rotation. Therefore, one revolution of the thin-walled split mold 19 can be selected by rotating the jumping motor 55 once. It is unnecessary to use an expensive servo motor as the jumping motor 55, and a normal DC motor or the like is used.

The jumping motor 55 has a motor shaft 5
A rotation detector 5 for detecting that the rotation phase of 5a is zero
7 is provided. An origin detection switch 58, which is a proximity switch for detecting that the number-of-molds selection key 51 is at the origin position (a position for selecting all the sheets) in the end mold 20.
Is provided. Further, an opening mold releasing mechanism 59 composed of a push-down pin and a spring member is provided in the end mold 20, so that the opening mold 21 is in close contact with the engagement surface with the end mold 20 when pressed against a plate material and cannot be separated. Has been prevented.

The lifting drive 49 (FIG. 4)
A screw-type linear / rotation conversion mechanism 61 and a cylinder device 60 for moving the screw shaft 61a forward and backward are provided. The drive gear 50 is rotated via a nut 62 by the forward and backward movement of the screw shaft 61a. By using the cylinder device 60 as a drive source in this manner, the lifting mechanism 27 has a compact configuration, and interference with the plate feeding device 13 (FIG. 3) and the like is less likely to occur.

FIG. 8 shows an elastic locking mechanism 63 for holding the thin-walled split mold 19 at the jumping position Q so as not to rotate by its own weight or the like. The elastic locking mechanism 63 is provided with the moving member 35.
A locking mechanism main body 64 provided in (FIG. 2) and a locking pin 66 whose lower end engages with the locking recess 65 of each thin-walled split mold 19.
And a biasing spring 67 for projecting the locking pin 66. The locking pin 66 and the spring 67 are connected to the locking mechanism main body 64.
The locking pin 66 can be lowered to a position where the enlarged head portion of the locking pin 66 engages with a step in the storage hole 68. Locking pin 66 corresponding to each thin-walled split mold 19
Is installed in the thickness dimension of the thin-walled split mold 19,
The positions are alternately shifted back and forth for each thin-walled split mold 19.

According to the elastic locking mechanism 63, each of the thin-walled split molds 19 at the jumping-up position Q is elastically held by the locking pin 66, and is engaged with the die number selection key 51 shown in FIG. Only the thin-walled split mold 19 that is driven dynamically has the locking pin 66.
, Against the elastic locking force, and is turned down to the use position P. Thin-walled split type 19 returned to the jumping position Q
Is engaged with the locking pin 66 again and is held.

FIG. 9 shows a thick-walled split mold 18 and a central mold 17.
FIG. The thick-walled split mold 18 has a roller support member 69 rotatably supporting the guide roller 23, which is detachably attached with a set screw 70, and an upper shoulder surface 18a.
Contact the lower surface of the split type support rail 24 (FIGS. 2 and 4) which supports the guide roller 23 on the upper surface, and receives the pressing force when the ram 7 is lowered. As described above, since the guide roller 23 is detachable from the thick-walled split mold 18, the thick-walled split mold 1
In the event of damage to the 8, only the thick-walled split mold 18 that needs to be replaced can be removed, and maintenance can be performed easily.

The central mold 17 is divided into two central molds 17a and 17b.
As in the case of the thick-walled split mold 18, the guide roller 71 is detachably attached to the split-type support rail 24 via a roller support member 72 with a set screw 73.
Thereby, the opening and closing of the gap for the arrangement of the thin central mold 17c (FIGS. 10 to 13) between the divided central molds 17a and 17b is possible. The dividing line M is divided into two divided central molds 17.
14A and 14B show the positions of the divided planes. In addition, the split central type 17
The movable range of a and 17b is regulated by the central stopper 80 fixed to the ATC base 6. One of the split central molds 17b incorporates a central mold opening / closing cylinder 74, which is a central mold opening / closing device, and is connected to the other split central mold 17a by a piston rod 74a. Also, a thin center type advance / retreat cylinder 75 which is a thin center type advance / retreat device and an open / close confirmation proximity switch 76 are installed on the split central mold 17 a via a support 77.

As shown in FIG. 11, a thin center mold 17c
Is stored in a concave portion 78 provided on the dividing surface of one of the divided central molds 17b when not needed, and is advanced to the same front-rear position as the divided central molds 17a and 17b by driving the thin central mold advance / retreat cylinder 75. Further, as shown in FIG. 13, the thin central mold 17c is formed lower than the divided central molds 17a and 17b, and the upper end face is engaged with the pressure locking surface 79 formed on the divided surface of the divided central mold 17a. Thus, it is possible to receive the pressing force when the ram 7 is lowered. FIG.
In FIG. 3 and 81, reference numeral 81 denotes a cable carrier connected to the mold setting slide body 26, and reference numeral 82 denotes a support thereof.

The mold exchanging operation of the above configuration will be described. FIG.
FIG. 4 is a pattern diagram of a mold replacement state. FIG. 7A shows a state where the mold width L is the longest. When changing the die width in units of 100 mm, it is only necessary to select the thick-walled split die 18 as shown in FIG. When changing in units of 10 mm, the number of sheets of the thick-walled split mold 18 and the thin-walled split mold 19 is selected as shown in FIG. When performing in 5 mm increments, refer to FIG.
The selection of the thin center mold 17c is performed as described above. FIG. 7E shows a state where the mold width L is minimum.

FIG. 17 shows a flowchart of the mold changing operation. The example of the die changing operation in FIGS. 15 and 16 will be described with reference to FIG. FIG. 15 shows that the maximum width (3100 mm) is 625 mm.
The operation of reducing the mold width L to the width is shown. First, the ram 7 (FIGS. 1 and 3) is raised (step S1) from the longest width state in FIG.
9 is jumped up (S2). After this, the thick split mold 1 that is not used
The lock of the unnecessary mold movement preventing device 40 (FIG. 2) is released (S4), and the movement axis (U axis) of the mold installation slide body 26 is released.
To the in side (center side) to the desired position (S
5). That is, an unnecessary thick split mold 18 is taken.
This state is the state shown in FIG. Here, the connecting pin 32 of the mold connecting mechanism 30 is engaged with the pin engaging hole 25 of the thick split mold 18 (S6), and the U axis is moved to the out side (S6).
7) Then, the unnecessary thick mold 18 is moved outward (FIG. 15C).

Thereafter, the connecting pin 32 is removed (S8), and the mold setting slide body 26 is moved inward as shown in FIG. 15D (S9), and the mold selection key 51 (FIG. 5) is moved here. Then, the thin-walled split mold 19 is selected (S10). Then, a mold descending permission signal obtained from predetermined sensors (not shown) is confirmed (S11), and the end mold 20 and the selected thin-walled mold 19 are pivoted down to the use position P (S1).
2). At this time, U is moved to the position shown in FIG. 15D so that a slight gap (for example, about 10 mm) is obtained between the thin-walled split mold 19 and the central mold 17 that have been lowered.
Determine the axis coordinates. After the molds 19 and 20 have been rotated downward as described above, as shown in FIG.
Slightly to the in side to eliminate the gap (S1
3) The target mold width L is set. Then, the thick-walled split die 18 not used is locked by the unnecessary die movement preventing device 40, and the die width changing operation is completed.

FIG. 16 shows that the mold width L is changed from 625 mm to 850 mm.
The operation in the case of expanding to is shown. From the state of the original mold width of FIG. 16 (A), the ram 7 is raised and the molds 19,
After performing the jumping up of S20 (S1, S2), the unnecessary thick-walled split mold 18 is unlocked by the unnecessary-type movement preventing device 40 (S15), and the mold setting slide body 26 is moved to the out side (S15). S16) Go to the two thick-walled split dies 18 (FIG. 16B). Here, the connecting pins 32 are connected (S
17) After moving the mold installation slide body 26 inward as shown in FIG. 16C (S18), the mold selection key 51 is moved to select the number of thin-walled split molds 19 (S19). Next, the end mold 20 and the selected thin-walled split mold 19 are shown in FIG.
6 (D) to rotate downward (S20), and connect pin 3
2 is removed (S21). Thereafter, the mold setting slide body 26 is slightly moved inward to eliminate the gap between the center mold 17 and the center mold 17 (S22), and the target mold width L is obtained as shown in FIG. Then, the thick-walled split die 18 not used is locked by the unnecessary die movement preventing device 40, and the die width changing operation is completed.

In the mold exchanging apparatus 11 of this embodiment, the end mold 20 is of the flip-up type, and the mold setting slide body 26 on which the end mold 20 is installed and the thick split mold 18 are formed. Because the connection mechanism 30 can be freely connected and disengaged by the pin 32, the movement of the end mold 20 is used to select the thick-walled split mold 18 and gather it to the center. Can be evacuated. For this reason, a dedicated selecting mechanism and a moving mechanism for the thick-walled split mold 18 are not required, and the configuration is simplified. Further, the number of the thin-walled split molds 19 to be set in a non-use state by jumping up is changed by the type selection key 51 which is engaged with the thin-walled split molds 19.
The feed screw 52 for moving the key 51 in the axial direction is rotated by one rotation of the motor 55.
Since the lead is used to feed the thickness of one sheet, an expensive driving device such as a servomotor is not required, and the thin-walled split mold 19 can be selected with a simple configuration.

In the operation process shown in FIG.
In parallel with the operation between B, the die width changing operation for the central die 17 shown in FIG. 18 is performed as necessary. That is, FIG.
After the operation of step S7 or S16, as shown in step R1 of FIG. 18, the necessity of the thin center mold 17c is determined, and the thin center mold 17c is not required and is required in any case. It is determined whether or not it is in use (R2, R6).

If the thin center mold 17c is required and is not in use, the process proceeds from step R6 to R7, where
The approach operation of the thin center mold 17c is performed in the process shown in FIG. That is, from the state of FIG.
b is opened by the operation of the central mold opening / closing cylinder 74 as shown in FIG. 8B (R7), and the thin central mold 17c is advanced by the thin central mold access cylinder 75 (R8).
a and 17b are closed as shown in FIG. 11C (R9).

If the thin center mold 17c is necessary and is in use, the process proceeds from step R6 to the terminal B, where no operation is performed. When the thin center mold 17c is unnecessary and is in use, the split center molds 17a and 17b are opened (R
3) After the thin central mold 17c is withdrawn (R4), the divided central molds 17a and 17b are closed. If the thin center mold 17c is not required and is not in use, the process proceeds from step R2 to the terminal B, where no operation is performed.

[0036]

According to the die exchanging device for a sheet material bending machine of the present invention, the number of thin-walled split molds to be made non-use by jumping up can be selected by a die selection key engaged with the thin-walled split mold. The feed screw that moves the key in the axial direction is a lead that feeds the thickness of one thin-walled split type with one rotation of the motor. Therefore, an expensive driving device such as a servomotor is not required, and the thin-walled split type can be selected. It can be performed with a simple configuration.

In the case of the construction of claim 2, an elastic locking mechanism for holding the unnecessary thin-walled split mold at the jumping position is provided.
The mechanism for selecting the thin-walled split type is further simplified.

[Brief description of the drawings]

FIG. 1 is a front view of a sheet bending machine equipped with a mold changing device according to one embodiment of the present invention.

FIG. 2 is a partially enlarged front view of the mold changing apparatus.

FIG. 3 is a side view of the folding machine main body.

FIG. 4 is a partially enlarged cutaway side view of the mold changing apparatus.

FIG. 5 is a partially enlarged cutaway front view of the mold changing apparatus.

FIG. 6 is a cutaway front view of the flip-up driving device in the mold changing device.

FIG. 7 is an enlarged side view of a mold connecting mechanism in the mold changing apparatus.

FIG. 8 is an enlarged cutaway side view of a thin-walled split type elastic locking mechanism.

9A is an enlarged side view of a thick-walled split type, and FIG. 9B is an enlarged cutaway front view of a thick-walled split type and a center die.

FIG. 10 is an enlarged plan view of a divided central type.

FIG. 11 is an explanatory view showing the mold width changing operation of the center mold in a broken plane.

FIG. 12 is an explanatory diagram showing the center type mold width changing operation from the front.

FIG. 13 is an explanatory view showing the mold width changing operation of the center mold from the side.

FIG. 14 is a pattern diagram of various die width adjustment examples of the die changing device.

FIG. 15 is an explanatory diagram of an example of a mold width reducing operation of the mold changing apparatus.

FIG. 16 is an explanatory diagram of an example of a die width expanding operation of the die changing apparatus.

FIG. 17 is a flowchart of the entire die width changing operation of the die changing apparatus.

FIG. 18 is a flowchart of a center die width changing operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bending machine main body, 2 ... Upper type, 3 ... Lower type, 4 ... Bending type, 6
... Base for die changing device (ATC), 7 ... ram, 8 ... elevator cylinder, 11 ... die changing device, 12 ... rotary clamp,
13: plate feeder, 17: central type, 17a, 17b ...
Split center type, 17: Thin center type, 18: Thick split type, 1
9: Thin-walled split type, 20: End type, 21: Open type, 23 ...
Guide rollers, 24: split-type support rails, 25: pin engagement holes, 26: mold mounting slides, 27: flip-up mechanism, 2
8 lower guide rail 29 split guide mechanism 30
Mold connecting mechanism, 35: reciprocating moving member, 36: pin joint, 37: U-axis servo motor, 38: upper guide rail, 40: unnecessary type movement preventing device, 43: end type moving mechanism, 45: rotation for jumping up Shaft, 49 ... drive for jumping up,
51: Key for selecting the number of molds, 52: Feed screw, 55: Motor for jumping up, 63: Elastic locking mechanism, 74: Opening / closing cylinder of center type, 75: Cylinder for entering and exiting thin center type, L: Width of mold, P
... use position, Q ... jumping position, W ... plate material, W1 ... projecting part

Claims (2)

(57) [Claims] 1. A part of an upper mold is constituted by a plurality of thin-walled split molds arranged in a width direction of the mold, and these thin-walled split molds are rotatable between a use position and a jumping position on a jumping rotary shaft. The key for selecting the number of molds, which is to be installed in the rotary shaft for engaging the rotating shaft for jumping and the thin-walled split mold in the rotating direction, is selected independently of the movement of each mold.
Only arranged to be axially movable relative to the thin split for, only setting a feed screw for advancing and retreating by one sheet thickness of the thin split the type number selection keys in one rotation of the motor, the motor
A die changing device for a plate bending machine provided with a rotation detector for detecting a predetermined rotation phase of the rotor . 2. A plurality of thin plates in which a part of the upper die is arranged in the width direction of the die.
It is composed of a split-wall type, and these thin-walled split types are
To be rotatable between the use position and the jump position.
The lifting rotary shaft and the thin-walled split type are engaged in the rotation direction.
Is provided so as to be movable in the axial direction.
The selection key is one rotation of the motor.
The feed screw to only forward and backward is provided, the thin split resiliently engage die change of the thin split plate material bent machine provided with a resilient locking mechanism for preventing downward rotation of the of the recoil ne raised position apparatus.