JP2003080398A - Press machine - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a press machine capable of balancing unbalanced force by a mechanism having a simple structure. SOLUTION: The press machine is capable of reciprocating a rotational movement of a crankshaft 20 arranged on a frame 14 in a second direction intersecting the first direction so as to be rotatable around an axis extending in a first direction. And a first motion conversion device for transmitting the rotational motion of the crankshaft 18 to a balance weight disposed on the frame 14 at a second distance from the slide 30. Slide weight 3
And a second motion conversion device for transmitting the motion to the slide 30 for reciprocating movement opposite to zero. The second motion conversion device adjusts the inertial force generated by the balanced weight by adjusting the stroke length of the balanced weight in the second direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press equipped with a slide and a counterweight that are reciprocally moved by the rotary motion of a crankshaft.

[0002]

2. Description of the Related Art As one of press machines, one provided with a slide reciprocated by a rotary motion of a crankshaft and a balance weight for balancing an unbalanced force (inertial force) caused by the reciprocating motion of the slide. is there. However, with this press machine, if the weight of the mold assembled to the slide changes,
Since the unbalanced force caused by the reciprocating motion of the slide changes, the unbalanced force cannot be balanced with high accuracy.

There is also a press machine equipped with a balance weight in which the stroke length of the slide and the balance weight can be adjusted (for example, Japanese Patent Laid-Open No. 7-132400).
However, in this press, since the slide and the balance weight stroke length are adjusted by a common means, when the weight of the die assembled to the slide changes, the unbalanced force due to the reciprocating motion of the slide changes. As a result, the unbalanced force cannot be balanced with high precision.

In a press equipped with a balance weight, it has been proposed to adjust the inertial force of the entire balance weight by adjusting and adjusting the position of the center of gravity of the adjustment weight, using an adjusting weight (Japanese Patent Laid-Open No. 62-62). -192298).

[0005]

[Problems to be Solved] However, in the conventional press machine capable of adjusting the inertial force of the balance weight, the inertial force of the entire balance weight is adjusted by displacing the adjustment weight with respect to the main weight. And its support mechanism and the like have to be reciprocally moved. Therefore, the support mechanism and the displacement mechanism for the adjusting weight are complicated, and the press machine becomes expensive.

It is an object of the present invention to allow unbalanced forces to be balanced by a mechanism having a simple structure.

[0007]

A pressing machine according to the present invention comprises:
A first transmitting a rotational movement of a crankshaft rotatably arranged on a frame about an axis extending in a first direction to a slide reciprocally movable in a second direction intersecting the first direction; And the rotational movement of the crankshaft is transmitted from the slide to the balance weight arranged in the frame at an interval in the second direction to reciprocate the balance weight in the opposite direction to the slide. A second motion conversion device for transmitting to the slide accordingly. The second motion conversion device adjusts a stroke length of the balance weight in the second direction.

When the crankshaft is rotated, the slide and the counterweight are driven by separate motion converters (ie, motion transfer devices) in opposite directions synchronously in the first direction. When the weight of the mold attached to the slide changes,
The complaint effect (inertial force) due to the reciprocating motion of the slide changes. When the stroke length of the balance weight is changed by the stroke adjusting device, the force (inertial force) caused by the reciprocating motion of the balance weight changes.

Therefore, according to the present invention, when the unbalanced force due to the reciprocating motion of the slide changes due to the replacement of the die assembled to the slide or the like, the stroke length of the balance weight is adjusted by the stroke adjusting device. The unbalanced force can be balanced by changing with. Further, since it is not necessary to use the adjusting weight, the unbalanced force can be balanced by a mechanism having a simple structure.

The second motion conversion device further includes a first motion conversion device.
Is pivotally assembled to the frame so as to be displaceable in the second direction by means of the second connecting tool, and is spaced in the third direction intersecting both the first and second directions by the second connecting tool. A first lever pivotally assembled to the frame so as to be displaceable in the third direction by a second connecting tool at the set position, and the first lever is connected to the first lever as the crankshaft rotates. A connection for connecting the crankshaft and the first lever for swinging around a connection point of the second connecting member to the frame, and a reciprocating movement of the slide with the reciprocating movement of the connection. A second lever pivotally connected to the first lever, wherein the stroke adjusting device includes a connection between the frame and the first lever by the second connecting member. It can be made to adjustably maintain the position in the third direction locations.

In the above press having the first and second levers, when the crankshaft is rotated, the first lever reciprocates in the second direction on the side of the first connector. It is angularly reciprocated about the side of the second connector. The angular reciprocal movement (swing) of the first lever is transmitted to the balance weight by the second lever to reciprocate the balance weight in the second direction. The swingable range of the first lever differs depending on the position in the third direction of the connecting portion between the frame and the first lever by the second connecting tool.

When the position of the connecting portion between the frame and the first lever by the second connecting member in the third direction is changed by the stroke adjusting mechanism, the bending and extending range of the first and second levers becomes large. Or it gets smaller. As a result, the reciprocating range of the connecting portions of both levers in the second direction is changed, so the stroke length of the balance weight is changed, and as a result, the force (inertial force) that can be balanced by the balance weight is generated. Be changed. Therefore, even if the unbalanced force due to the change in the weight of the mold or the like changes, the unbalanced force can be balanced with high accuracy.

The first connecting member may include a slider disposed on the frame so as to be reciprocally movable in the second direction, and a pivot connecting the slider to the first connecting portion.

The second connector is a first slider disposed on the frame so as to be displaceable in the third direction,
A second slider displaceably coupled to the first lever in the third direction, the second slider being pivotally coupled to the first slider about an axis extending in the horizontal direction. And the position adjusting mechanism can adjustably maintain the position of the first or second slider in the third direction.

The position adjusting mechanism is a screw member having a first screw portion extending in the third direction, the screw member assembled to the first or second slider, and the first screw portion. A rotary body having a second screw portion screwed into the rotary body, the rotary body being rotatably arranged on the frame about an axis extending in the third direction.

The second motion converting device is a pair of the first levers pivotally connected to each other by the first connecting member, and is connected to the frame by the first connecting member. Extends to the opposite sides of each other
Pair of the first levers connected to the frame by the connecting tool, a pair of the second levers individually connecting the first lever to the slide, and the frame by the second connecting tool And a pair of the position adjusting mechanisms for individually adjusting the position of the connection portion of the first lever in the third direction. By doing so, since the balance weight is reciprocally moved by the two sets of levers, the reciprocating movement of the balance weight is stable.

The second motion converting device is further pivotally mounted on the frame so as to be displaceable in the second direction by the first connecting member, and the third connecting member by the third connecting member. A third lever pivotally assembled to the frame so as to be displaceable in the direction of the arrow and extending from the side of the first connector to the side opposite to the first lever.
Lever, a fourth lever pivotally connected to the third lever to reciprocate the slide in accordance with the reciprocating movement of the connection, the frame and the third member by the third connector. A second position adjusting mechanism that adjusts the position of the connecting part of the lever in the third direction. By doing so, since the balance weight is reciprocally moved by the two sets of levers, the reciprocating movement of the balance weight is stable.

In a preferred embodiment, the second lever is pivotally connected to the first lever at a location between the first and second connectors and the fourth lever is connected to the fourth lever. The third lever is pivotally connected to the lever at a position between the third and fourth connectors. The second and fourth levers are respectively connected to the first and second rods provided on the slide so as to be pivotable about an axis extending in the first direction. Further, the slide is spaced from the crankshaft in the frame in the second direction.

The first motion converting device is another stroke adjusting device independent of the stroke adjusting device of the second motion converting device, and adjusts the stroke length of the slide in the second direction. Other stroke adjustment devices can be included. However, the first motion conversion device may not include such a stroke adjusting device.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIGS. 1 to 4, a press 10 includes a frame. The frame includes a lower frame 12 on which a lower die is arranged, an upper frame 14 supported by the lower frame 12, and gear cases assembled on both sides of the upper frame 14 in the left-right direction (the left-right direction in FIG. 1). 16 and 16.

The crankshaft 18 is rotatably mounted on the upper frame 14 at the both ends of the upper frame 14 by a plurality of bearings so as to be rotatable about an axis extending in the front-rear direction (direction perpendicular to the plane of FIG. 1). The first eccentric shaft portion 22 is provided at the center in the longitudinal direction, and the second eccentric shaft portions 24 are provided on both sides of the first eccentric shaft portion 22.

The slide 30 for assembling the upper mold 26 is attached to the lower ends of a pair of rods 32 which penetrate the lower end of the upper frame 14 so as to be capable of reciprocating vertically.
The upper frame 14 restricts the reciprocating motion in the vertical direction. The slide 30 is arranged below the crankshaft 18, and both rods 32 are spaced in the left-right direction (the left-right direction in FIG. 1).

The balance weight 34 is located above the crankshaft 18 and is formed on the upper frame 14 with a plurality of guide portions 3 formed therein.
6 is arranged so as to be capable of reciprocating in the vertical direction.

The crankshaft 18 receives a drive source (not shown) such as an electric motor on a flywheel 38 mounted on one main shaft portion 20, and is rotated at a constant speed. The flywheel 38 includes a clutch and a brake. The rotary motion of the crankshaft 18 is converted into vertical motions by the first motion transmitting device, that is, the first motion converting device and the second motion transmitting device, that is, the second motion converting device, and the slide 30 and the slide 30 are moved. It is transmitted to the balance weight 34.

The first motion converting device has a first connection 40 pivotally connected to the first eccentric shaft portion 22 of the crankshaft 18 via a bearing at the upper end, and pivotally connected to each other at one end. A pair of rocking levers 42 that are connected to each other and are pivotally connected to the lower end of the first connection 40 and extend in opposite directions, and a rod 32 that is individually connected to the rocking lever 42 at the upper end.
A pair of connecting levers 44 that are individually connected to each other, and both swing levers 42 that are pivotally received by the upper frame 14.
And a pair of support levers 46 for individually supporting the other end of each of them in a displaceable manner.

The lower end of the first connection 40 and the one ends of the two rocking levers 42 connect the upper and lower sliders 50, which are vertically movably arranged on the upper frame 14, to the upper and lower sliders 50. Is connected to the upper frame 14 so as to be able to reciprocate in the vertical direction, and is also connected to the upper frame 14 so as to be pivotally movable with respect to each other by a connector including a pivot 52 extending in the front-back direction.

The upper and lower ends of each support lever 44 are
By the pivots 54 and 56 extending in the front-back direction,
It is pivotally connected to the longitudinal middle portion of the corresponding rocking lever 42 and the upper end portion of the corresponding rod 32.

The vertical slider 50 is vertically movably received by the guide portions 58 formed on the left and right side walls of the upper frame 14 so as to extend vertically, and the movable direction is vertically regulated. There is. For this reason, the lower end portion of the first connection 40 and the one end portions of both swing levers 42 are restricted in the movable direction in the vertical direction.

The upper end of each support lever 46 is attached to the frame 14 by a pivot 60. In contrast,
The lower end of each support lever 46 is connected by a pivot 62 to the other end of the corresponding rocking lever 42.

The second motion conversion device has a pair of second connections 70 pivotally connected to the second eccentric shaft portion 24 of the crankshaft 18 via bearings at the upper end, and pivots to each other at one end. And a pair of first levers 72 that are connected to each other and are pivotally connected to the upper end of the second connection 70 and extend in opposite directions, and are individually connected to the first lever 72 at the upper end. And a pair of second levers 7 individually connected to the counterweight 34.
4 and a pair of stroke adjusting mechanisms 76 for individually adjusting the positions of the first levers 72 in the left-right direction with respect to the upper frame 14.

A lower end portion of the second connection 70 and one end portions of both the first levers 72 are provided with a pair of vertical sliders 80 movably arranged in the upper frame 14 in the vertical direction.
It is assembled to the upper frame 14 so as to be able to reciprocate in the vertical direction by a connector including a pivot 82 extending in the front-rear direction so as to connect both the upper and lower sliders 80, and is pivoted to the upper frame 14 and to each other. It is movably connected.

The lower end and the upper end of each second lever 74 are formed by pivots 84 and 86 extending in the front-rear direction, respectively, in the longitudinal middle part of the corresponding first lever 72 and the lower end of the corresponding balance weight 34. Is pivotally connected to the section.

The vertical slider 80 is vertically movably received by guide portions 88 formed on the left and right side walls of the upper frame 14 so as to extend in the vertical direction, and the movable direction is regulated in the vertical direction. There is. Therefore, the upper end portion of the second connection 70 and the one end portions of both the first levers 72 are restricted in the movable direction in the vertical direction.

The other end of each first lever 72 has a first slider 90 disposed on the upper frame 14 so as to be displaceable in the left-right direction, and a second slider 72 corresponding to the first lever 72 displaceable in the left-right direction. A connector, which includes a second slider 92 attached to a first slider 90 and pivotally movable about an axis extending in the front-rear direction and coupled to an end portion, allows displacement in the left-right direction. Upper frame 1
It is mounted on the 4 axis.

Each of the first sliders 90 corresponds to the upper frame 1
The guide portion 94 is formed to extend in the left-right direction and is movably received in the left-right direction. As a result, the movable direction is restricted in the left-right direction, and rotation about the axis extending in the left-right direction is prevented.

The second slider 92 is pivotally connected to the first slider 90 by a shaft portion extending in the front-rear direction, and the other end portion of the corresponding first lever 72 is slidable in the left-right direction. Accepting to. The shaft portion that pivotally connects the first and second sliders 90 and 92 may be provided on either one of the first and second sliders 90 and 92.

Each stroke adjusting mechanism 76 has a male screw member 96 arranged on the first slider 90 so as to extend in the left-right direction, a rotor 98 having a female screw portion screwed to the male screw member 96, and a rotor 98. And a gear 100 for rotating the shaft around an axis extending in the left-right direction.

The male screw member 96 is attached to the second slider 92 so as not to move relative to it, and is projected to the outside of the gear case 16. However, the male screw member 96
May be immovably mounted on the first slider 90, or may be integrally formed with the first or second slider 90 or 92.

The rotor 98 is an external gear having external teeth that mesh with the gear 100, and the female screw portion has a male screw member 9
6 and the upper frame 14 and the gear case 16 are screwed together.
Has been accepted by. The gear 100 is supported by the gear case 16 in a state of meshing with the external teeth of the rotating body 98 so that the rotating body 98 can be rotated around the male screw member 96.

In the press machine 10, when the crankshaft 18 is rotated, both swing levers 42 are moved so that the slider 50 and the pivot shaft 52 side, especially the pivot shaft 54, reciprocate in the vertical direction. Is angularly reciprocated around the other end side (the pivot 62 side). The angular reciprocal movements of the two rocking levers 42 cause the connecting lever 44 to reciprocate up and down in synchronization with each other, thereby reciprocating the slide 30 up and down.

When the crankshaft 18 is rotated, both the first levers 72 move toward the slider 80 and the pivot 82,
In particular, the pivot 84 is angularly reciprocated about the other end so that the pivot 84 reciprocates in the vertical direction. The angular reciprocal movement of both the first levers 72 causes the second lever 74 to synchronously reciprocate up and down, thereby reciprocating the balance weight 34 up and down.

In the press machine 10, when the crankshaft 18 is rotated, both the first levers 72 are provided at the other ends of the sliders 80 and the pivot 82, so that the pivot 84 reciprocates in the vertical direction. It is angularly moved back and forth around the side. The angular reciprocal movement of both the first levers 72 causes the second lever 74 to synchronously reciprocate up and down, thereby reciprocating the balance weight 34 up and down.

The reciprocating motion of the slide 30 and the reciprocating motion of the parallel weight 34 are phase-shifted by 180 ° so as to be opposite to each other. Each set of pivotally connected levers 42 and 44 and first and second pivotally connected levers 72
And 74 each have a corresponding first lever 44 and 7
Two angular reciprocations result in relatively slight flexion and extension.

In the press machine 10, when the second eccentric shaft portion 24 of the crankshaft 18 is located above as shown in FIGS. 5 (A) and 6 (A), both first levers 72 are in a straight line. And the second eccentric shaft portion 24 is located in FIG.
As shown in (B), both of the first levers 72 are adjusted so as to bend with each other and the first lever 72 swings when positioned below.

The positions of the first and second sliders 90 and 92 in the left-right direction with respect to the frame are set in the left-right direction between the screw member 96 and the rotating body 98 by rotating the gear 100 of the stroke adjusting mechanism 76 manually or electrically. It can be adjusted by changing the screwing position.

The swingable range of the first lever 72 is defined by the first and second sliders 9 in the left-right direction with respect to the frame.
It depends on the positions of 0 and 92, that is, the positions of the connection points of the sliders 90 and 92 to the frame.

FIG. 5 shows a state in which the sliders 90, 92 are moved to the extreme ends of the first lever 72, and FIG. 6 shows a state in which the sliders 90, 92 are moved to the center side of the first lever 72. Show. Further, FIGS. 5A and 6A show a state in which the balance weight 34 is moved to the top dead center (at this time, the slide 30 is moved to the bottom dead center), and FIG. )
6B shows a state in which the balance weight 34 is moved to the bottom dead center (at this time, the slide 30 is moved to the top dead center).

When the crankshaft 18 is rotated, the stroke length of the balance weight 34 becomes S1 in the state of FIG. 5 in which the sliders 90 and 92 are moved to the extreme ends of the first lever 72. The sliders 90 and 92 are attached to the first lever 72.
In the state of FIG. 6 in which it is moved to the center side of S, it becomes S2. This is because the effective length of the first lever 72 differs depending on the positions of the sliders 90 and 92 in the left-right direction.

Therefore, in the press 10, the stroke length of the balance weight 34 becomes larger as the sliders 90 and 92 are located closer to the end of the first lever 72.
This is because the effective length of the first lever 72 increases as the sliders 90 and 92 are located on the outermost end side of the first lever 72.

When the positions of the sliders 90 and 92 in the left-right direction are changed by the stroke adjusting mechanism 76, the first
The swingable range of the lever 72 is increased or decreased. As a result, the reciprocating range of the connecting portion of the first lever 72 to the frame in the left-right direction is changed, so that the stroke length of the balance weight 34 is changed.

Therefore, according to the press machine 10, the unbalanced force due to the reciprocating motion of the slide 30 is applied to the slide 30.
When there is a change due to, for example, replacement of the mold 26 to be assembled with the unbalanced force, it is possible to balance the unbalanced force by changing the stroke length of the balance weight 34 with the stroke adjusting device 76. Further, since it is not necessary to use the adjusting weight, the unbalanced force can be balanced by a mechanism having a simple structure.

According to the press machine 10, the slide 3 is also used.
0 and the balance weight 34 are provided with two sets of levers 42 and 44, respectively.
And the two sets of levers 72 and 74 reciprocate, so that the reciprocating movement of the slide 30 and the balance weight 34 is stabilized. However, the present invention is not limited to the slide 30 and the counterweight 34.
A pair of levers 42,44 and a pair of levers 72,74
Can be applied to a press machine that reciprocates.

When the first eccentric shaft portion 22 of the crankshaft 18 is located below, the press machine 10 has both first levers 7
2 does not need to be adjusted so as to be aligned in a straight line, and when the first eccentric shaft portion 22 of the crankshaft 18 is not located below, for example, the first eccentric shaft portion 22 is located above. It may be adjusted so that both first levers 72 are positioned in a straight line when they are positioned or when the first eccentric shaft portion 22 is positioned in the middle in the vertical direction.

The connector for connecting the other end of the first lever 72 to the frame and the stroke adjusting mechanism 76 can be other mechanisms. For example, instead of using an external gear as the rotating body 98, an internal gear, a ratchet wheel, a sprocket,
Other flat plate-shaped rotating bodies such as a timing pulley may be used. Further, instead of the screw member 96 and the rotating body 98, a position adjusting mechanism including other members such as a worm wheel, a worm screw, a small gear, a ratchet, a chain, a timing pulley and a timing belt may be used.

Referring to FIG. 7, in the press machine 110, the other ends of both the swing levers 42 are assembled to the upper frame 14 by a connector, that is, a connector in the same manner as the first lever 72, and the frame in the left-right direction is also assembled. Swing lever 4 to
The second connecting portion can be adjusted by a position adjusting mechanism 112 similar to the stroke adjusting mechanism 76, and the stroke length of the slide 30 can also be changed.

Similar to the connector for the first lever 72, each connector is a slider 114 disposed on the upper frame 14 so as to be displaceable in the left-right direction, and a swing lever 42 corresponding to the slider 114 displaceable in the left-right direction. Is connected to the other end of the slider and is capable of pivoting about an axis extending in the front-rear direction.
14 and a slider 116 assembled to the same.

The slider 114 is movably received in the left-right direction by a guide portion 118 formed in the upper frame 14 so as to extend in the left-right direction. As a result, the movable direction is restricted in the left-right direction, and rotation about the axis extending in the left-right direction is prevented.

The slider 116 is pivotally connected to the slider 114 by a shaft portion extending in the front-rear direction, and receives the other end of the corresponding rocking lever 42 slidably in the left-right direction. Sliders 114 and 116
The shaft portion that pivotally connects the sliders 114 and 116
It suffices if it is provided in either one of the above.

Each position adjusting mechanism 112 has a male screw member 120 arranged on the first slider 114 so as to extend in the left-right direction, a rotor 122 having a female screw portion screwed to the male screw member 120, and a rotor 122. And a gear 124 for rotating the shaft around an axis extending in the left-right direction.

The male screw member 120 is used for the second slider 11
6 is mounted so as to be relatively immovable, and is projected to the outside of the gear case 126. The rotating body 122 is
The external gear has external teeth that mesh with the gear 124, and is received by the upper frame 14 and the gear case 126 in a state where the female screw portion is screwed into the male screw member 120.

In the press machine 110, the position adjusting mechanism 1
12, sliders 114 and 116, male screw member 120,
The rotating body 122 and the gear 124 are each configured similarly to those for the first lever 72, and
Works like them.

Therefore, in the press 110,
The position of the sliders 114, 116 in the left-right direction with respect to the frame is adjusted by rotating the gear 124 of the position adjusting mechanism 112 manually or electrically to change the screwing position of the screw member 120 and the rotating body 122 in the left-right direction. It is possible to adjust the stroke length of the slide 30.

According to the press machine 110, not only the same operational effect as the press machine 10 but also the additional effect that the stroke lengths of the slide 30 and the balance weight 34 can be adjusted separately are produced. .

The present invention is not limited to the press machine in which the second motion converting device uses the first lever 72 extending in the left-right direction, and the other second motion converting device such as the motion converting device using the link mechanism.
It can also be applied to a press machine that uses the motion conversion device described above.

For example, the second motion conversion device uses at least a pair of links which are connected to each other so as to be capable of bending and stretching, one of the links is connected to the eccentric shaft of the crankshaft, and the other of the links is connected to the balance weight. Then, the stroke adjusting device may be configured to maintain the bendable / extendable range of both links adjustable.

The present invention is not limited to the above embodiment. For example, in the present invention, the moving directions of the slide and the balance weight are
It can also be applied to press machines in other directions such as horizontal and diagonal directions. Therefore, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a pressing machine according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

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

4 is a sectional view taken along line 4-4 in FIG.

FIG. 5 is a diagram for explaining the stroke length when the connecting portion of the lever to the frame is moved to the most end portion of the lever, (A) when the balance weight is located at the top dead center. (B) shows when the balance weight is located at the bottom dead center.

FIG. 6 is a diagram for explaining the stroke length when the connecting portion of the lever to the frame is moved to the center side of the lever, and (A) shows the case where the balance weight is located at the top dead center. (B) shows the case where the balance weight is located at the bottom dead center.

FIG. 7 is a partially sectional front view showing another embodiment of the press machine according to the present invention.

[Explanation of symbols]

10,110 Press machine 12 and 14 frame upper and lower frames 16 frame gear case 18 crankshaft 20 Main part of crankshaft 22, 24 Crankshaft eccentric shaft 26 mold 30 slides 32 rod 34 Balance weight 40,70 connections 72,74 First and second levers 76 Stroke adjustment mechanism 80 Vertical slider 82,84,86 Axis for connection 88 Guide part for vertical slider 90,92 First and second sliders 94 Guide portion for first slider 96 Male screw member 98 rotating body 100 gears

Claims (9)

[Claims] 1. A slide arranged to reciprocate a rotational movement of a crankshaft rotatably arranged on a frame around an axis extending in a first direction in a second direction intersecting with the first direction. A first motion converting device for transmitting the rotational motion of the crankshaft to the balance weight arranged in the frame at a distance from the slide in the second direction, and the balance weight for transmitting to the slide. Conversely, a second motion conversion device that transmits to a slide to reciprocate is included, and the second motion conversion device includes a stroke adjustment device that adjusts a stroke length of the balance weight in the second direction. , Press machine. 2. The second motion conversion device is further pivotally assembled to the frame so as to be displaceable in the second direction by a first connecting member, and the second connecting member is provided with a second connecting member. A first lever pivotally assembled to the frame so as to be displaceable in the third direction by a second connecting tool at a position spaced in a third direction intersecting both the first and second directions. And connecting the crankshaft and the first lever so as to swing the first lever around the connection point of the second connection tool to the frame with the rotational movement of the crankshaft. A stroke and a second lever pivotally connected to the first lever to reciprocate the slide according to the reciprocating movement of the connection. Said third connection points of the frame and the first lever by coupling of
2. The press according to claim 1, wherein the position in the direction of is maintained adjustable. 3. The slider is arranged on the frame so as to be capable of reciprocating in the second direction.
The press machine according to claim 2, further comprising a pivot connecting the slider to the first connecting portion. 4. The second connecting member is coupled to a first slider displaceable in the third direction and disposed on the frame, and to the first lever displaceably in the third direction. A second slider coupled to the first slider for pivotal movement about an axis extending in the horizontal direction, the position adjusting mechanism in the third direction. The press according to claim 2 or 3, which maintains the position of the first or second slider adjustable. 5. The position adjusting mechanism is a screw member having a first screw portion extending in the third direction, the screw member having the first screw portion.
Alternatively, it is a rotating body having a screw member assembled to the second slider and a second screw portion screwed into the first screw portion, and is rotatable about an axis extending in the third direction. The rotating body arranged on the frame is included.
Press machine described in. 6. The pair of the first motion conversion devices, wherein the pair of the first motion conversion devices are pivotally connected to each other by the first connector.
A pair of the first levers that extend from the connection points of the first connecting tool to the frame to opposite sides and are connected to the frame by the second connecting tool, respectively. A pair of the second levers for individually connecting one lever to the slide, and the positions in the third direction of the connection points of the frame and the first lever by the second connection tool, respectively. The press machine according to claim 2, further comprising a pair of the position adjusting mechanisms. 7. The second motion conversion device is further pivotally mounted on the frame so as to be displaceable in the second direction by the first connecting member, and by the third connecting member. A third lever pivotally mounted on the frame so as to be displaceable in a third direction, wherein the first lever is the first lever.
A third lever extending from the side of the connector toward the side opposite to the first lever, and a third lever pivotally connected to the third lever to reciprocate the slide with the reciprocal movement of the connection. 4. A lever according to claim 2, further comprising a lever of No. 4, and a second position adjusting mechanism for adjusting the position of the connection portion of the frame and the third lever by the third connecting tool in the third direction. The press machine according to any one of items. 8. The first motion conversion device is another stroke adjustment device independent of the stroke adjustment device of the second motion conversion device, the stroke length of the slide in the second direction being adjusted. The press according to any one of claims 1 to 7, further comprising another stroke adjusting device for adjusting. 9. The second motion conversion device further includes at least a pair of links movably connected to each other, one of the links being connected to an eccentric shaft portion of the crankshaft, and the other of the links. 2. The press machine according to claim 1, wherein the link is connected to the slide, and the stroke adjusting device adjustably maintains a bending range of both links.