JPH11342495A - Toggle press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a toggle press, by which a stroke length and a shut height position are automatically adjusted, capacities of a toggle mechanism and a driving motor can be set small, and production speed and work efficiency are improved. SOLUTION: In this toggles press, a base shaft 8, a swing shaft 16, and a direct driving shaft 18 are respectively coupled with the first and second toggle links 15A, 15B, 17A, and 17B, and a slide 19 is vertically reciprocatingly moved by the swing of a connecting rod 31. This press comprises: a female screw element 46 arranged in parallel with a moving direction of the slide 19 and only rotatable; a male screw element 48 which is screwed in the screw element 46 and moved upward/downward; a relaying link 54 swingably arranged at an upper end of the male screw element 48; the connecting rod 31, one end of which is connected to the relaying link and the other end of which is connected to the base shaft 8 and the swing shaft 16; and a main driving servo motor 57 for rotating the female screw element 46, so as to drive the main driving servo motor by the command of a NC device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toggle press, and more particularly to a toggle mechanism in which a first toggle link member and a second toggle link member of a toggle mechanism are swung by a connecting rod to reciprocate a slide vertically. The present invention relates to a toggle press to be moved.

[0002]

2. Description of the Related Art A conventionally known toggle press is, for example, shown in FIG. 10 showing a central longitudinal sectional view and FIG. 11 showing a sectional view taken along line FF of FIG. A block 102 is provided movably up and down via a wedge plate 103. Main shaft block 10
A base shaft 104 supported on an arcuate surface on the lower surface of the base 2 is pivotally attached to the base block 102 by two side plates (not shown). This base shaft 104 has two first toggle links 106.
A is pivotably connected to a pivot shaft, and a pivot shaft 107 is pivotally supported at a lower end thereof. A first toggle block 106B is sandwiched between the base shaft 104 and the pivot shaft 107. Further, two second toggle links 108A are swingably connected to the swing shaft 107, and a linear motion shaft 109 is pivotally supported at the lower end thereof. 2 toggle blocks 1
08B is sandwiched.

The linear motion shaft 109 is pivotally supported by a vertically reciprocable slide 111 having an upper die attached to the lower surface. The slide 111 is connected to an air cylinder 112 through a connecting rod (not shown) penetrating the upper portion of the frame 101.
Being lifted by. One end of a connecting rod 113 is pivotally connected to the swing shaft 107. The other end of this connecting rod 113 is pivotally connected to a crank 117 of a crankshaft 116 connected to a large pulley 114 rotated by a motor 115. Therefore, the crankshaft 11
The rotation of 6 activates the toggle mechanism. Wedge plate 103
A male screw 118 is protruded, and a female screw keyed to a handle 119 is screwed into the male screw 118. The wedge plate 103 is moved forward and backward by manual rotation of the handle 119.

[0003]

In the toggle press having such a configuration, the height of the slide 111 is adjusted in accordance with the type of the product to be pressed and the slide height of the slide 111 is changed. The allowable pressure will be discussed with reference to FIG.

Since the axial position of the crankshaft 116 and the length of the connecting rod 113 are constant, the shut height H
12A, the second toggle link 108A and the second toggle link 108A with respect to the pressure axis connecting the center of the base shaft 104 and the center of the linear motion shaft 109, as shown in FIG. The angle α1 formed by the toggle block 108B is larger than the angle α0 when the main shaft block 102 is lowered by S from the position shown in FIG. 12A to reduce the shut height H shown in FIG. 12B. . Therefore, when the shut height H is increased, the allowable pressing force of the slide 111 decreases. Conversely, when the shut height H is reduced, the angle becomes smaller and the allowable pressing force becomes larger. In order to have such a pressing force characteristic, the allowable pressing force of the slide 111 fluctuates due to the adjustment of the position of the shut height H, and the allowable pressing force of the slide 111 is secured under the condition when the shut height H is maximized. Therefore, it is necessary to set the capability of the toggle mechanism (slide drive mechanism) and its drive motor to be large.

Further, since the axial center position of the crankshaft 116 and the length of the connecting rod 113 are constant, for example, when coining is repeatedly performed on the same work several times during coining and gloss is produced on the coining surface, the same is applied. After the first time, although the stroke can be sufficiently processed with a small stroke length, the stroke length of the slide 111 during the repeated processing is constant, and there is a problem that the processing time is wasted and the production speed does not increase. Furthermore, when changing the mold by changing the type of workpiece to be machined,
In the shut height adjustment, the wedge plate was sensibly moved by manually turning the manual handle, so that there was a problem that work efficiency was poor.

[0006] The present invention has been made in view of such problems of the prior art.
To provide a toggle press capable of automatically adjusting the stroke length and the position of the shut height even during operation, setting the capability of the toggle mechanism and its drive motor to a small value, and improving the production speed and work efficiency. It is assumed that.

[0007]

According to a first aspect of the present invention, there is provided a base shaft supported on an upper portion of a frame, one end of which is pivotally connected to the base shaft. A swingable first toggle link member, a linear motion shaft supported on a vertically movable slide in parallel with the base shaft, and one end pivotally connected to the linear motion shaft and having the linear motion shaft as a swing center. A swingable second toggle link member, a swing shaft pivotally attached to the other end of each of the first toggle link member and the second toggle link member, and one end pivotally attached to the swing shaft. The slide together with the linear motion shaft is performed by swinging the swing shaft of the toggle mechanism including the base shaft as a swing center and a connecting rod capable of swinging the swing shaft around the base shaft. A toggle press that reciprocates up and down,
A female screw body that is supported in parallel with the vertical movement axis of the slide and that can only rotate; a male screw body that is screwed to the female screw body and that can move up and down by the rotation of the female screw body; A relay link movably pivotally connected, a connecting rod having one end pivotally connected to the relay link and the other end pivotally connected to the base shaft and the swing shaft and swingable about the base shaft, and A main drive servomotor for rotating the female screw body, and at least one of a vertical movement speed and a stroke length of the slide via the toggle mechanism by controlling the drive of the main drive servomotor in accordance with a command of an NC means. One is arbitrarily controlled.

According to the present invention, the vertical position of one end side of the connecting rod pivotally connected to the relay link is automatically adjusted appropriately in accordance with the adjustment position of the shut height, and the capabilities of the toggle mechanism and its drive motor are set to be small. In addition, the vertical movement speed and / or the stroke length of the slide can be automatically adjusted appropriately. Further, even when coining is repeatedly performed several times, the stroke length of each stroke can be automatically set appropriately, so that the production speed can be improved. In addition, since the connecting rod is pivotally connected to the base shaft and the swing shaft, the pressing force of the slide is increased by the ratio of the length of the connecting rod to the distance between the base shaft and the swing shaft. Can be.

According to a second aspect of the present invention, there is provided a base block provided with the base shaft supported at a lower end portion and provided to be vertically movable below the upper end portion of the frame, and a base block facing the base block and the frame. A wedge-shaped inclined surface that is slidably contactable with a wedge-shaped inclined surface formed on at least one of the surfaces, and a wedge plate that is slidably moved forward and backward so as to be sandwiched therebetween,
A shut-height adjusting mechanism including a male screw body attached to the wedge plate, a female screw body screwed to the male screw body and supported so as to be rotatable only, and an adjustment servomotor for rotating the female screw body; The wedge plate is moved forward and backward by controlling the drive of the adjusting servomotor in accordance with a command of the NC means,
The height position of the slide is arbitrarily controlled by wedge action of wedge-shaped inclined surfaces formed on the wedge plate and the base shaft block, respectively.

According to the present invention, the position of the shut height can be automatically adjusted as needed when the setup of the mold is changed, and the position of the shut height can be adjusted by controlling the position of the main drive servomotor and the adjustment servomotor. Correspondingly, the vertical position of one end side of the connecting rod pivotally connected to the relay link can be automatically adjusted appropriately, and the allowable pressing force of the slide can be made constant.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a toggle press according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 4 and 2 showing a cross section taken along line B.
5 showing the DD section of FIG. 5 and FIG. 6 showing the EE section of FIG. 1 will be described.

The frame 2 established on the machine base 1 has a rectangular through window 2a formed in the center. A bolster 3 is attached to a lower position of the window 2a, and a lower mold 4 is installed thereon. At the upper position of the window 2a, a base block 6 having an upper surface formed with a wedge-shaped inclined surface 6a and a horizontally formed substantially semicircular concave groove 6b formed on a lower surface is disposed so as to be vertically movable.

The semicircular groove 6b supports the base shaft 8 via a half bearing 7 whose phase is prevented from being shifted by a key. The lower surface of the base shaft block 6 is formed such that the front surface is inclined forward from the center of the support of the base shaft 8 in order to avoid interference when the first toggle links 15A and 15B swing. Between the wedge-shaped inclined surface 6a of the base shaft block 6 and the sliding lower surface 2b of the frame 2, the wedge-shaped inclined surface 6
a wedge-shaped inclined surface 9a which can be slidably contacted with the wedge-shaped inclined surface 6a and slides between the wedge-shaped inclined surface 6a and the sliding lower surface 2b so as to advance and retreat in the left-right direction shown in FIG. Is equipped. Of course, the wedge-shaped inclined surface may be formed on the sliding lower surface 2b side of the frame.

Side plates 11A and 11B are fastened to both sides of the base block 6 with bolts.
11B supports the base shaft 8 via a cylindrical bearing through holes bored downward, and four lifting bars 13A, 13 which are erected on the upper surface thereof and penetrate above the frame 2.
The side plates 11A, 11B are lifted upward together with the base block 6 and the base shaft 8 by the respective lifting springs 14 provided on the frame 2 via B, 13C, 13D.
Therefore, the wedge plate 9 is provided with the sliding lower surface 2b of the frame 2 and
It is in close contact with the wedge-shaped inclined surface 6a of the base shaft block 6.

A first toggle link 15 is provided at both ends of the base shaft 8.
One end of each of A and 15B is pivotally connected via a cylindrical bearing. And the base shaft 8 of the first toggle link 15A, 15B
Both ends of the swing shaft 16 are supported in parallel with the base shaft 8 via cylindrical bearings in holes drilled at the other end at a predetermined distance from the shaft. At both ends of the swing shaft 16, a second
One ends of the toggle links 17A, 17B are pivotally connected via cylindrical bearings. And the second toggle link 17A,
In a hole drilled at the other end of the swing shaft 17B at a predetermined distance from the swing shaft 16, a direct drive shaft 18 is fitted with a base shaft 8 via a cylindrical bearing.
It is mounted in parallel with.

A semicircular groove 19a parallel to the base shaft 8 is formed at the center of the upper surface, and the slide 19 for supporting the linear motion shaft 18 through a half bearing 21 whose phase is prevented by a key. Is disposed below the vertical axis of the base shaft 8.
The slide 19 has a semicircular concave groove 19a in which the right-angle cross section has a V-shape on both sides sandwiching the central linear drive shaft 18 and first and second toggle links 15A, 15 on both left and right sides.
B: Side wall 19 rising so as to surround 17A, 17B
b, 19c are formed.

The side wall 19b of the slide 19,
Four corners 19d, 19 in the horizontal section of FIG. 19c (FIG. 6)
e, 19f and 19g are chamfered at 45 °, and the planes of the corners are flat bearings and clearance adjusting jib 2 respectively.
The guide plates 22A, 22B, 22C, and 22D fixed to the frame 2 via 0A, 20B, 20C, and 20D
The slide 19 is vertically slidably guided.

Lifting rods 26A, 26B are provided on the side walls 19b, 19c of the slide 19, respectively, and penetrate the frame 2 upward, and are connected to piston rods 27a of air cylinders 27A, 27B provided on the upper surface of the frame. ing. Pressurized air is supplied to the lower chambers of the air cylinders 27A and 27B to offset the weight of the slide 19 and the lifting force, and to reduce the weight of the base shaft 8 and the swing shaft 1
The gap between each of the toggle link members and the linear motion shaft 6 is eliminated.

Further, between the base shaft 8 and the oscillating shaft 16, a half bearing 28, which is prevented from phase shift by a key and slides on the base shaft 8.
A connecting rod 31 having a long arm 31a protruding rearward is sandwiched by a half-split bearing 29 that slides in contact with the swing shaft 16 while preventing phase shift by a key.
Further, between the swing shaft 16 and the linear motion shaft 18, a half-split bearing 32 that prevents a phase shift by a key and slides on the swing shaft 16, and a phase shift is prevented by a key from the linear motion shaft 18. A toggle block 34 is sandwiched between the sliding bearings 32 and the half bearing 32 so that there is no gap. The upper end of the toggle block 34 is formed on a surface inclined rearward from the support center of the swing shaft 16 together with the bearing 32 so that interference with the base of the connecting rod 31 does not occur when the swing shaft 16 swings. ing.

Therefore, the slide 19 at the time of the toggle action is provided.
The reaction force of the pressing force of the toggle block 34 and the connecting rod 3
1, the first toggle link 15A, 15B and the second toggle link 17A, 17B can be protected. An upper mold 35 corresponding to the lower mold 4 is attached to the lower surface of the slide 19.

The wedge plate 9 is provided with a male screw 36 projecting forward and rotatably.
7, a female screw body 38 with a pulley, which is rotatable and is prevented from moving in the axial direction, is screwed together with no gap. An adjustment servomotor (M2) 39 is installed on the frame 2, and the rotation is transmitted to the male screw body 36 by a timing belt 42 stretched between the pulley 41 of the output shaft and the pulley portion 38a of the female screw body 38. The wedge plate 9 is moved forward and backward as appropriate. The base block 6 is moved up and down by the advance and retreat movement of the wedge plate 9, and the shut height H shown in FIG. 2 is adjusted. Further, the wedge plate 9 due to the impact at the time of press working is formed.
In order to prevent the displacement, the hydraulic cylinder devices 40A and 40B for locking the male screw body 36 are provided, and the male screw body 36 is held except when the shut height is adjusted.

The drive mechanism of the toggle mechanism is provided at the rear of the frame 2. A female screw rotatable by a radial and thrust bearing and prevented from moving in the axial direction is mounted on a bracket 45 established on the machine base 1 behind the frame 2. The support 44 is supported in the vertical direction. The female screw support 44 includes
A female screw body 46 is integrally attached with a driven pulley 47 for a timing belt interposed therebetween. And female screw body 4
A female screw 46a (preferably a ball female screw) is engraved on the inner peripheral surface of 6, and a through hole 44a having a diameter larger than the screw diameter of the female screw 46a is formed on the inner peripheral surface of the female screw support 44.

An external thread 48 (preferably a ball external thread) is screwed into the internal thread 46a of the internal thread 46, and the external thread 48 is moved up and down by the rotation of the internal thread 46. The lower end of a support 51 is keyed to the upper end of the male screw body 48. This support 51 is formed on a bracket 37 on the machine base 1 on a flange 51b formed so as to protrude to the left and right sides. The guide rods 52A and 52B held above the stands 53A and 53B are inserted therethrough, and are guided and supported so as to be able to move up and down together with the male screw body 48.
Above the support 51, a forked portion 51a is formed so that the support shaft 50 can be inserted in parallel with the base shaft 8.

On the support shaft 50 of the support body 51, the relay link 5
4 is pivotally supported via a bearing. The rear end of the connecting rod 31 is rotatably connected to the forked portion 54a at the other end of the relay link 54 by a support shaft 56 that is supported through. A main drive servomotor (M1) 57 is provided vertically behind the male screw body 48, and a driving pulley 58 for a timing belt of an output shaft extending downward.
A timing belt 59 is stretched between the driven belt 47 and the driven pulley 47. Accordingly, when the rotation of the servomotor 57 is transmitted to the female screw body 46 via the driven pulley 47, the male screw body 48 is moved up and down together with the support body 51 without rotating, so that the connecting rod 54 is connected via the relay link 54. The rear end of the connecting rod 31 is moved up and down, and the connecting rod 31 is swung about the base shaft 8 as the swing center.

Bolster 3, and lower frame 2
, A knockout 61 is inserted vertically, and the upper end thereof contacts the lower surface of the lower mold 4. The lower end thereof is a balance lever 63 pivotally supported on the frame 2 by a pin 62.
Is connected to one end of The other end of the balance lever 63 is connected to the piston rod 6 of the air cylinder 64 provided on the frame 2.
4a. Therefore, the air cylinder 6
When the pressurized air is supplied to the upper chamber 4, the knockout 61 rises to lift the lower mold 4, and the coined workpiece can be extruded from the intermediate mold held on the lower mold 4.

Further, a measuring device MS2 is provided on the rear surface of the wedge plate 9.
Is mounted horizontally, and a scale reader 67 is mounted on the back of the frame 2 correspondingly. Also on the back of slide 19,
Magnescale 68 of measuring device MS1 is mounted vertically, and scale reader 69 is mounted on frame 2 correspondingly. The adjustment servomotor 39 for adjusting the forward / backward movement of the wedge plate 9 and the main drive servomotor 57 are driven and controlled by an NC device (not shown).
7 and 69, the positions of the wedge plate 9 and the slide 19 are set to N.
The data is input to the C device.

Next, the normal pressing operation of the present invention will be described with reference to FIGS.

It is assumed that, for example, a blank to be coined is placed on the lower mold 4 by a supply device (not shown). When the swing position of the toggle link member is in the state shown in FIG. 7, it is assumed that the position of the reciprocating slide 19 is located at the rising end. By the rotation of the main drive servomotor 57 in accordance with the command of the NC device based on the input information, the female screw body 46 is rotated via the driving pulley 58, the timing belt 59, and the driven pulley 47, and the male screw body 48 is gradually raised. I do.

As a result, the rear end of the connecting rod 31 pivotally connected to the support shaft 56 via the relay link 54 is raised, and the connecting rod 31 is swung about the base shaft 8.
7, the arm 31a is in the state shown in FIG. 2 when the arm 31a is horizontal or horizontal, and during this time, the slide 19 and the upper mold 35 are lowered together with the direct-acting shaft 18, and the lower mold and the intermediate mold are moved. The upper and lower surfaces of the blank are coined by cooperation with the mold, and the main drive servo motor 57
Is stopped for a predetermined time. Thereafter, in response to a command from the NC device, the main drive servomotor 57 is rotated in the reverse direction by a predetermined amount, stopped in the state of FIG. 7 for a predetermined time, and coining of one workpiece is completed.

After the slide 19 during this time is set at the raised end position, pressurized air is sent to the upper chamber of the air cylinder 64, the balance lever 63 is turned clockwise (see FIG. 2), and the lower mold 4 is raised. The work is lifted out of the intermediate mold by a work lifting and conveying device.

Next, the case of repeatedly coining the same work several times will be described with reference to FIG. This processing is performed, for example, when giving gloss to the coining surface. However, if the same stroke length is repeated several times, coining processing wastes working time. Therefore, the stroke length of the slide 19 in the second and subsequent processing is reduced. Is made smaller.

In step S1, the slide at the raised end position is rotated forward by the command of the NC device of the main drive servomotor (M1), the male screw body 48 is raised, and the connecting rod 31 is rotated counterclockwise to slide. 19 is lowered. In step S2, it is determined whether or not the lower end is measured by the magnescale 68 and the scale reader 69 of the measuring device MS1, and if NO, the process proceeds to step S1 to continue descending, and steps S1 and S2 are repeated.

If YES in step S2, the servo motor M1 is stopped in step S3, and the slide 19 is located at the lower end. In step S4, a preset timer in the NC device operates.
In step S5, it is determined whether the time is up and N
If it is O, the judgment is repeated until the time is up. YE
When S is reached, the coining process ends. In step S6, one count is subtracted from the counter value of the number of times of stamping set in advance. In step S7, it is determined whether the counter has become zero. If NO, the main motor M1 is reversed in step S8, the male screw body 48 is lowered, the connecting rod 31 is turned clockwise, and the slide 19 is rotated.
To rise.

In step S9, it is determined by the measurement of the magnescale 68 and the scale reader 69 of the measuring device MS1 whether or not the position of the ascending intermediate point set in advance and stored in the NC device has been reached. If NO, the process proceeds to step S8, and the slide continues to rise, and steps S8 and S9 are repeated. If YES in step S9, in step S10, the rotation of the main drive servomotor M1 is stopped, and the slide 19 is positioned at the intermediate set point. In step S11, a timer operates.
In step S12, the timer waits until the repeat time up to determine if NO or time-up is determined. If YES, the process proceeds to step S1, and steps S1, S2, S3, S4, S5, and S6 are executed and repeated until the count value set in step S7 matches.

If the answer is YES in step S7, the main drive servomotor M1 is reversed in step S13, and the slide 19 is raised. In step S14, it is determined whether the slide 19 has reached the rising end by the measuring device MS1.
Is determined by the magnescale 68 and the scale leader 69, and if NO, the process shifts to step S13, the slide 19 continues to rise, and steps S13 and S14 are repeated. If YES, the main drive servomotor M1 is stopped at step S15, the slide 19 is at the raised end position, coining is completed, and coining and glossing of the work surface are performed.

Next, a description will be given of a case in which the shut height H is changed by exchanging the mold in accordance with the change of the workpiece, with reference to FIG. 9 showing a flow of the automatic shut height determination.

A shut height H required for frequently processing a work is preset in an NC device (not shown), and the shut height H is input and set for a new unset work each time. ing.

In step S21, it is determined whether or not a necessary shut height H corresponding to the work has been set. In the case of NO, in step S22, an uninput shut height H is input. Upon completion of the input, automatic setting is started in step S23. If “YES” in the step S21, the process shifts to a step S23 to start the automatic setting.

In step S24, the main drive servo motor (M1) 57 is rotated. The commanded rotation amount is determined by setting the reference value of the shut height H to A, the newly input shut height H or the set shut height H of the next work, that is, the set value of the changed shut height, and the driving pulley of the main drive servomotor 57. When the reduction ratio R1 between the driven screw 58 and the driven pulley 47 of the female screw body 46 and the pitch P1 of the male screw body 48 are (A-set value) × (R1 / P1).

In step S25, the measuring device MS1
It is determined whether or not (A−set value) × (R1 / P1) has been measured. If NO, the process shifts to step S24, and the rotation of M1 is continued. YE in step S25
The determination is repeated until S appears. If the answer is YES, the main drive servomotor M1 stops rotating, and step S2
At 6, the adjustment servo motor M2 is rotated.

The command rotation amount is obtained by setting the wedge angle of the wedge plate 6 to θ,
When the reduction ratio R2 between the pulley 41 of the adjusting servomotor (M2) 39 and the pulley portion 38a of the female screw body 38 is P2 and the pitch of the female screw 38 is P2, [(A-set value) / tan θ]
× (R2 / P2). In step S27, (A−set value) / tan θ × (R2 / P
It is determined whether the value of 2) has been measured. If NO, the process proceeds to step S26, and the rotation of M2 is continued. Y
The determination is repeated until the ES appears. If YES, the adjusting motor M2 stops and the setting is completed.

Although the wedge-shaped inclined surface 6a formed on the base block 6 and the wedge-shaped inclined surface 9a formed on the wedge plate 9 have been described on the lower surface side of the base block 6, the lower surface side of the base block 6 has been described above. It can be freely designed to be formed on the upper surface, on the upper surface, or on both surfaces.

[0047]

As described above, according to the first aspect of the present invention, the position of one end of the connecting rod pivotally connected to the relay link is automatically adjusted as appropriate in accordance with the adjustment position of the shut height, and the toggle is provided. The capacity of the mechanism and its drive motor can be set small, and the vertical movement speed and / or stroke length of the slide can be automatically adjusted as appropriate. Further, even when coining is repeatedly performed several times, the stroke length of each stroke can be automatically set appropriately, so that the production speed can be improved. In addition, since the connecting rod is pivotally connected to the base shaft and the swing shaft, the pressing force of the slide is increased by the ratio of the length of the connecting rod to the distance between the base shaft and the swing shaft. It has the effect of being able to.

Further, according to the second aspect of the present invention, the position of the shut height can be automatically adjusted as needed when changing the setup of the mold, and further, the position of the main drive servo motor and the adjustment servo motor can be controlled. According to the position adjustment, the position of the one end of the connecting rod pivotally connected to the relay link is automatically and appropriately adjusted, so that the allowable pressing force of the slide can be made constant.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a toggle press of the present invention, and is a front view.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view taken in the direction of arrow C in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along the line DD of FIG. 2;

FIG. 6 is a sectional view taken along the line EE of FIG. 1;

FIG. 7 is an explanatory view showing a main part of the present invention, and shows a state of a toggle mechanism at an ascending position of a slide.

FIG. 8 is a diagram showing a flow of several times of punching according to the present invention.

FIG. 9 is a diagram showing a flow of automatic shut height setting of the present invention.

FIG. 10 is a vertical sectional view of a center of a frame of a toggle mechanism of a toggle press according to the related art.

11 is a sectional view taken along line FF of FIG. 10;

FIG. 12 is an explanatory diagram showing a change in allowable pressure force when a shut height is changed in a conventional technique.

[Explanation of symbols]

 2 Frame 4 Lower die 6 Main shaft block 8 Main shaft 9 Wedge plate 15A, 15B First toggle link 16 Swing shaft 17A, 17B Second toggle link 18 Linear shaft 19 Slide 31 Connecting rod 34 Toggle block 35 Upper die 36 Male screw body 38 Female threaded body with pulley 46 Female threaded body 48 Male threaded body 39 Adjustment servo motor 57 Main drive servo motor 54 Relay link

Claims (2)

[Claims] 1. A base shaft supported on an upper part of a frame, a first toggle link member pivotally connected to the base shaft at one end and swingable about the base shaft, and a slide shaft movable up and down. A second toggle link member that is pivotally supported at one end and is pivotally mounted on the linear motion shaft, and that can swing about the linear motion shaft as the swing center; the first toggle link member and the first toggle link member; The swing mechanism of a toggle mechanism, comprising: a swing shaft pivotally attached to the other end of each of the second toggle link members; and a connecting rod having one end pivotally attached to the swing shaft and capable of swinging the swing shaft. A toggle press for vertically reciprocating the slide together with the linear motion shaft by swinging a moving shaft around the base shaft as a swing center, wherein the female screw is rotatably supported in parallel with the vertical movement axis of the slide. Body, and the female screw body is screwed into the female screw body. A male screw body that can be moved up and down by rotation, a relay link pivotally attached to the upper end of the male screw body, one end is pivotally connected to the relay link, and the other end is the base shaft and the swing shaft. And a main drive servomotor for pivoting the female screw body, the main drive servomotor being driven by an NC means command. Wherein at least one of the vertical movement speed and the stroke length of the slide is arbitrarily controlled via the toggle mechanism. 2. A base block which is supported at a lower end thereof and is vertically movable at a position lower than an upper end of the frame, and at least one of an opposing surface of the base block and the frame. A wedge-shaped inclined surface slidably in contact with the formed wedge-shaped inclined surface, a wedge plate slidably moved between the wedge-shaped inclined surfaces, a male screw body attached to the wedge plate, and the male screw body A screw height adjusting mechanism including a female screw body screwed to and supported only rotatably, and an adjusting servomotor for rotating the female screw body, wherein the adjusting servomotor is drive-controlled by a command of NC means. Moving the wedge plate forward and backward so that the height position of the slide is arbitrarily controlled by the wedge action of the wedge-shaped inclined surfaces formed on the wedge plate and the base shaft block, respectively. Contract The toggle press according to claim 1.