KR940008236B1 - Method of automatically adjusting ram position in pressing machine or the like and pressing machine - Google Patents

Abstract

No content.

Description

Device for adjusting position of reciprocating sliding member, automatic adjustment method for mounting position of press machine and reciprocating sliding member

1 is a front view showing a state in which the movable upper mold 63 of the conventional rocker arm type power press is partially cut.

FIG. 2 is a front sectional view showing a part of the movable upper die 63 of the rocker arm type power press shown in FIG.

3 is a front view showing a state in which the movable upper mold 63 of the rocker arm type power press is partially cut off as a first embodiment of the present invention.

4 is a plan view showing partly cut off the rocker arm of the press machine shown in FIG.

FIG. 5 is a front view showing a part of the vicinity of the rocker arm to explain the effect of the adjusting device of the reciprocating sliding member in the press machine shown in FIG.

6 is a front view showing a part of the state in which the reciprocating sliding member is raised by operating the adjusting device of the reciprocating sliding member in the press machine shown in FIG.

7 is a plan view of a lead frame of an IC in which cutting and bending processing are performed by a medium-sized press machine typical of a rocker arm type power press.

8 is a front view showing a part of the lock core arm power press cut in the second embodiment of the present invention.

9 is a plan view showing the vicinity of the rocker arm of the rocker arm type power press shown in FIG.

FIG. 10 is a flowchart for installing an adjustment action in the pressing force automatic adjustment mechanism of the rocker arm type power press shown in FIG.

* Explanation of symbols for main parts of the drawings

1 axis 2 arm member

4: connecting rod 3,5: connecting part

6: non-slip member 8: anticipation

10: fixed lower mold 14: machine body

20: adjusting mechanism 21: rotating shaft

22: bearing 23: worm wheel

24: worm gear 25: servo motor

26: coupling 63: movable upper

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the attachment position of a sliding member for reciprocating motion and a press machine to which the adjustment device is applied. In particular, a sliding member such as a ram of a press machine can be used to delicately adjust stroke length or die height. It relates to a device for.

The present invention also includes a method for automatically adjusting the pressing force as the attachment position of the reciprocating sliding member of the press machine is automatically adjusted, and a press machine to which the method is applied.

Recently, medium or small presses having a relatively short stroke length have been widely used in cutting or bending a lead frame of an electronic component such as an AJU machine part molding process or an integrated circuit (IC).

As such a conventional medium or small press machine, a crank press for moving the main slide by the crank mechanism is common.

The rocker arm type power press suggested in the "Press Handbook, Japanese Maruzen, page 207" and the like as an example of a conventional crank press will be described with reference to FIGS. 1 and 2.

The rocker arm type power press shown in FIG. 1 and FIG. 2 has a rocker arm 2 pivotably arranged about an axis 10 fixed to the main body thereof, and a shaft (at an end portion of the connecting portion 3). A sliding member pivotally connected by a connecting rod 4 pivotally connected by a shaft 54, a link 55 and a ball joint 56 at the other end connection 5 of the rocker arm 2 (6). The sliding member 6 includes a slide 64 directly connected to the ball joint 56, a shank 61 curved on the slide 64, and a movable upper mold fixed to the front end via an attachment member 62. 63).

The fixed lower mold 10 is fixed to the upper surface of the support plate 9 fixed to the upper surface of the base 8 of the main body.

With the above structure, the conventional rocker arm type power press shown in FIG. 1 operates as follows.

First, the up and down driving force (arrow A in FIG. 1) by the crank 40 acts on the connecting rod 4.

As the reciprocating driving force is transmitted to the rocker arm 2 via the connecting portion 3, the rocker arm 2 swings about the axis 1. The pivot of the connecting portion 5 due to the rocking arm 20 swing is converted into the vertical reciprocating motion of the shank 61 (arrow B in FIG. 1) to reciprocate the movable upper mold 63 up and down.

When press working is performed by such a conventional power press, the movable upper die 63 and the fixed lower die are first formed at the upper end of the stroke, that is, at the top dead center (as shown in FIG. 1). A work piece (not shown) is inserted between the parts (10) and (10). Next, as the crank 40 is operated and the connecting rod 4 is raised, the movable upper die 63 is lowered, and the workpiece is pressed between the movable upper die 63 and the fixed lower die 10, that is, the lower thread. It reaches the position of a point (state shown in FIG. 2).

The space | interval L shown in FIG. 1 is the stroke length of the movable upper mold | type 63, or the sliding member 6, and the space | interval H shown in FIG. 2 has shown what is called die height. The die height is generally defined as the distance between the bottom of the ram and the base plate of the frets machine, with the movable upper die at the bottom dead center, but the spacing H is the structure of the embodiment of the present invention (FIG. Correspondingly, the distance between the bottom surface of the shank 61 fixed to the slide (ram) 64 and the top surface of the pedestal 9 is shown.

By the way, the straw length L of the sliding member 6 in the medium and small press machines etc. which are represented by the above-mentioned lock-coal-type power presses is used, since the to-be-processed object is comparatively small and it is set to 30-50 mm normally.

In a press machine or the like having a small stroke length L as described above, in the case of an abnormality occurring in the movable upper mold 63 and the fixed lower mold 10 in the conventional example, the work to take out the workpiece within the mold. However, there is a problem that the reconditioning of the mold, the width, and other maintenance inspection work are very difficult.

That is, in a conventional press machine or the like as described above, when a work to be taken out of a workpiece or a maintenance inspection of the mold is performed when an abnormality occurs, the mold is usually removed from the machine to perform the necessary work, and then the mold is again performed. Had to be attached.

Therefore, the removal and reattachment of the mold is not only cumbersome, but also requires a great deal of effort such as stroke or fine adjustment in the reattachment operation.

In addition to the medium and small press machines of which the stroke length L is relatively small as described above, the die height H is also adjusted in the following manner in large press machines and the like.

First, a main reciprocating member such as a ram (in the conventional example, shank 61, etc.) is set at an appropriate height to press work, and then the die height H is corrected after inspecting the processing state of the product. Doing.

Therefore, in order to determine the appropriate die height, it is usually necessary to perform the above-mentioned adjustment work by machining, inspection, and correction many times, and there is a problem in that the production efficiency is deteriorated because the work is cumbersome and requires skill.

In addition, when an overload is applied to a conventional press machine or the like, i.e., when the set pressure exceeds the upper limit, it is known that an overload safety mechanism or the like is provided in which a load gauge which detects this is electrically disconnected from the clutch so that the operation of the machine is emergency stopped.

Nevertheless, if the machine is stopped when such an overload is applied, it requires a remnant for the next restart, which also causes a problem of poor production efficiency.

The first object of the present invention is to take out a workpiece, discharge work, or perform maintenance inspection on a mold without removing the mold from the machine body when an abnormality occurs in a medium or small press machine having a relatively short stroke. It is to provide an apparatus for adjusting the attachment position of a reciprocating sliding member, and a press machine equipped with the adjustment apparatus.

The second object of the present invention is to provide a method capable of appropriately and automatically adjusting the pressing force as the position is automatically adjusted at the bottom dead center of the reciprocating member to pressurize the workpiece, and a press machine to which the method is applied. .

A device for adjusting the attachment position of the reciprocating sliding member of the present invention which achieves the first object is an arm member pivotally attached about an axis located in the center of the longitudinal direction, and is pivotally connected at one end of the arm member. A driving force transmission member for transmitting a driving force for swinging the member around its center side, and a sliding member connected at least pivotally at the other end of the arm member.

The shaft serving as the swinging center of the arm member is fixed to the rotating member by offsetting the shaft center and the rotating shaft center of the shaft, and is provided with driving means for rotating the rotating member.

According to the above configuration, the driving force transmission member connected to one end of the arm member is first interposed, and the sliding member connected to the other end of the arm member can be reciprocated by swinging the arm member. Action can be obtained.

In addition, when the rotating member is rotated by the driving means, the shaft which becomes the swinging center of the arm member is eccentrically pivoted about the rotating shaft shaft center of the rotating member.

At this time, since the connecting portion between the one end of the arm member and the driving force transmitting member is fixed as if it is fixed, the connecting portion between the other end of the arm member and the one end thereof and the sliding member is pivoted.

Therefore, by pivoting the other end connecting portion of the arm member, the vertical position of the sliding member can be moved, and the stroke length thereof can be changed.

Furthermore, in a preferred embodiment, the rotating member comprises a worm wheel, and the rotational driving of the rotating member is performed as the driving means rotates the worm gear engaged with the worm wheel.

The press machine which achieves the first object assembles an attachment position adjusting device of the reciprocating sliding member retaining the structure on the main frame including the base, and attaches the movable type to the sliding member and the fixed type on the base of the main frame. Therefore, the movable mold can be realized by pressing the fixed mold and the workpiece at the bottom dead center of the sliding member.

The method for automatically adjusting the attachment position of the reciprocating sliding member which achieves the second object of the present invention first detects the pressing force applied by the sliding member at the bottom dead center of the sliding member. Next, when the measured value of the applied pressure is out of the upper and lower limits of the allowable range of the pressure, the position is adjusted at the bottom dead center as the sliding member moves up and down on the basis of the measured value of the pressure. This forces the pressing force to fall within the allowable range.

According to this method, the bottom dead center pressing force of the sliding member can be detected automatically, and when the pressing force is out of the allowable range, the position of the sliding member can be automatically adjusted to automatically adjust the pressing force to be within the allowable range.

Therefore, the bottom dead center force of the sliding member is always adjusted appropriately and automatically.

The press machine of the present invention, which achieves the second object, is provided with a sliding member for reciprocating to pressurize a workpiece at a bottom dead center, a main reciprocating mechanism for reciprocating the sliding member, and a bottom dead center pressing force of the sliding member. And an automatic elevating mechanism for automatically raising and lowering the position of the sliding member at the bottom dead center based on the pressing force detection signal obtained by the pressing force automatic detecting unit.

According to this structure, the press machine which can automatically correct the force which pressurizes a workpiece can be realized.

In a preferred embodiment of this press machine, the reciprocating drive mechanism has an arm member which swings about an axis, and a driving force transmission member pivotally connected to one end of the arm member.

In addition, a sliding member for pressurizing the workpiece is pivotally connected to the other end of the arm member so that the sliding member can reciprocate as the arm member swings.

Moreover, in the preferred embodiment of this press machine, the automatic elevating mechanism lowers the rotation axis of the worm wheel to the axis that is the swing center of the arm member, and eccentrically the axis of the axis that is the swing center of the arm member and the axis of rotation of the worm wheel. In addition, the worm gear is engaged with the worm wheel and the servo motor is connected to the worm gear.

With such a structure, the delicate pressing force adjustment of the workpiece by the sliding member can be realized with high accuracy automatically.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 to 7 show a first embodiment of this invention.

3 shows a state where the reciprocating member of the rocker arm type power press is located at the top dead center.

The rocker arm type power press according to this embodiment is pivotally pivotable by an arm member 2 as a rocker arm arranged pivotably about an axis 1 and a shaft 31 at its one end connection 3. A connecting rod 4 connected and a sliding member 6 pivotably connected by a shaft 51, 53 and a link 52 at the other end connecting portion 5 of the arm member 2 are provided.

The sliding member 6 is a movable upper mold fixed via a shank 61 extending through the light through hole 71 provided in the upper frame 7 of the main body of the press machine, and an attachment member 62 attached to the front end thereof. It contains (63).

The fixed lower die 10 is fixed to the upper surface of the base 9 fixed to the upper surface of the base 8 of the main body, and the guide members 11 and 11 on the pole are erected. (11) guides and slides the guided portions 62a and 62a of the attachment member 62.

The lower ends of the guide parts 62a and 62a of the attachment member 62 are pressed upward by the spring 129.

Moreover, the main body 14 is comprised by the base 8, the side frame 13, and the upper frame 7. As shown in FIG.

With the above structure, the rocker arm type power press of this embodiment shown in FIG. 3 operates as follows.

First, a vertical reciprocating driving force (arrow A in FIG. 3) at a driving source (not shown) acts on the connecting rod 4.

As the drive source, a fluid drive source such as hydraulic pressure or an electric drive source such as a pulse motor is applied.

As the reciprocating driving force is transmitted to the arm member 2 via the connecting portion 3, the arm member 2 swings about the shaft 1.

The pivot of the connecting portion 5 caused by the rocking of the arm base 2 is converted into the up and down reciprocation of the shank 61 (third arrow B) to reciprocate the movable upper mold 63 up and down.

When press-pressing is performed by the power press of this embodiment as described above, the movable upper mold 63 and the fixed lower mold are first operated when the movable upper mold 63 is located at the upper end of the stroke, that is, the upper dead center (shown in FIG. 3). (10) a yarn and a workpiece (not shown) are inserted.

Next, as the driving source is operated and the connecting rod 4 is raised, the movable upper die 63 is lowered to reach a position at which the workpiece is pressed between the movable upper die 63 and the fixed lower die 10, that is, the bottom dead center position.

The distance L shown in FIG. 3 is the stroke length of the movable upper mold 63 or the sliding member 6.

The above structure and operation are not substantially changed in particular as compared with the above-described conventional rocker arm type power press.

The lock core arm type press of this embodiment is significantly different from the conventional one in that the adjustment mechanism 20 for adjusting the attachment position of the sliding member 6 on the upper frame 7 is provided.

As shown in FIG. 4, the adjusting mechanism 20 includes rotating shafts 21 and 21 fixed to both ends of the shaft 1 of the arm member 2, and bearings for supporting the rotating shafts 21 and 21. (22) A worm wheel (23) fixed to one of the rotary shafts (21) and (21) and a worm gear (24) meshed with the worm wheel (23) are provided.

In addition, the servo motor 25 is provided as a driving source for rotating the worm gear 24 in both normal and reverse directions. The shaft 1 serving as the swinging center of the arm member 2 is fixed to the rotating shaft 21 such that the shaft center 0 ₁ is eccentrically predetermined distance from the shaft center 0 ₂ of the rotating shaft 21 as shown in FIG. It is.

Therefore, the arm member 2 is pivotally installed around the shaft 1, but when the worm wheel 23 is rotated at the time of maintenance inspection, the shaft 1 fixed to the rotation shaft 21 is rotated. It is installed so as to pivot in an eccentric state with respect to the shaft center (0 ₂ ) of).

A coupling 26 is provided between the worm gear 24 and the servo motor 25 to transmit the rotational driving force of the servo motor 25 to the worm gear 24.

For example, when a maintenance inspection operation is performed when an abnormality occurs between the movable upper mold 63 and the fixed lower mold 10, or when the workpiece is taken out when a defective molding of the workpiece occurs. By operating the servomotor 25 of the adjustment mechanism 20, the movable upper die 63 can be raised to an upward position as shown in FIG. 6, which facilitates such an operation.

The operation of the adjustment mechanism 20 is as follows.

First, when the servo motor 25 is operated, the worm gear 24 and the worm wheel 23 engaged thereto rotate. When the worm wheel 23 rotates, the shaft center 0 ₂ of the rotary shaft 21 and the shaft 1 fixed to the eccentric position are eccentrically pivoted about the shaft center 0 ₂ . At this time, since the one end side connecting portion 3 of the arm member 2 is in a fixed state, the arm member 2 pivots the connecting portion 5 on the other end side with the connecting portion 3 as a point.

Therefore, as the other short axis research part 5 is pivoted about the one end side connection part 3, it can raise in the upper denture which becomes longer than the normal stroke L of the movable upper mold 63. As shown in FIG.

As a result, sufficient space for easily performing maintenance inspection of the movable upper mold 63 and the lower fixed mold 10 and the like can be easily and quickly created between the movable upper mold 63 and the lower fixed mold 10.

Moreover, as the servomotor 25 is rotated, the vertical position of the movable upper mold 63 can be arbitrarily and simply set. For this reason, the stroke L fine adjustment operation | movement of the movable upper die 63 can be performed efficiently and reliably.

In this embodiment, a medium and small general press machine having a device for adjusting the attachment position of the sliding member has been described. However, the present invention can also be applied to other processing machines targeting small wave workpieces.

For example, in the lead frame shown in FIG. 7, a rectangular section divided by two-dot chain lines is also used for molding the lead 27 of an electronic component in which the IC on the region C is packaged with a resin material. Apparatus for adjusting the attachment position of the member can be applied.

That is, after packaging the resin, cutting off and removing unnecessary portions such as tie bars 28 from the lead frame, or machining the lead 27 with the reciprocating sliding member attachment position adjusting device in the bending process. The machine is applied effectively.

As described above, according to the first embodiment of the present invention, when the reciprocating sliding member attachment position adjusting device is applied to a medium or small press machine or the like, the mold and the like are not removed from the machine body even when the mold is abnormal. It shows the excellent practical effect that the work of taking out and discharging the work and the maintenance work of the mold and the like can be performed.

Therefore, it is possible to efficiently and reliably eliminate the reduction in the overall production efficiency caused by the need for a large amount of residual care due to the fine adjustment of the stroke and the like in disassembling the mold in the machine body or reattaching the mold.

Next, a second embodiment of the present invention will be described with reference to FIGS.

This embodiment is related to the lock core arm type power press as in the first embodiment, and most of the structure thereof is the same as in the first embodiment.

Therefore, the structure common to the first embodiment is denoted by the same reference numerals and the detailed description thereof is omitted.

This embodiment differs from the first embodiment in that the negative pressure position adjusting mechanism 20 of the sliding member 6 has a pressing force automatic detection unit 29, 29 which automatically detects the bottom dead center pressing force of the sliding member 6. It is installed.

In this embodiment, the pressing force detection signal S obtained by the pressing force automatic detection units 29 and 29 is output as a forward and reverse rotation signal of the servomotor 25 as indicated by the dashed-dotted arrow in FIG.

That is, the work piece 63 (sliding member 6) is moved by the up and down reciprocation (arrow B) while raising the connecting rod 4 in the up and down reciprocating driving force (arrow A) shown in FIG. As a reaction force of the pressing force, the side frame 13, the upper frame 7, or the like is deformed (strained) by tensioning or compressing them or by selecting action with each other.

Thus, for example, by attaching the pressure detecting device 29, 29 having strain gauges, to an appropriate portion such as the side frame 13 or the upper frame 7 [the upper frame ( 7 is shown in the vicinity of 7).] The pressurized force automatic detection unit (strain gauge) 29 detects the deformation as an electric signal, and the pressurized force detection signal S is applied to the servo motor 25. FIG. It is possible to output as a forward and reverse rotation signal.

As the signal path until the pressure detection signal S is output as the forward and reverse rotation signal of the servo motor 25, for example, the following means can be adopted.

Press force automatic detection part (strain gauge) 29 ⇒ amplifier ⇒ programmable logic controller (PLC) ⇒ servo motor 25

At this time, the resistance value change of the strain gauge generated by the pressing force of the sliding member 8 is extremely small, but it is possible to replace this with an electric signal.

Therefore, the electrical signal (voltage) output from the pressure detecting unit 29 is amplified by an amplifier and output to a programmable logic controller.

Therefore, PLC can compare the electric signal outputted from the amplifier with the set value already set and output it to the servomotor 25 as the forward and reverse rotation signal.

Next, the adjusting operation on the adjusting mechanism 20 of the sliding member 6 will be described in detail according to the flowchart shown in FIG.

First, the process 200 is a process of performing a normal press work.

In this press working operation, the pressing force automatic hanger 29 holding the strain gauge detects the pressing force when the sliding member 6 and the movable upper die 63 are at the bottom dead center as described above, and at the same time, the process 201 ), Compare whether the pressing force is within the range of the preset upper limit and lower limit.

When it is out of range, i.e., above the upper limit or below the lower limit, it is judged to be inoperable of the machine and the emergency stop is made (step 202). Go to step 203).

In step 203, if the pressing force detected by the pressing force automatic detection units 29 and 29 is within the lower limit of the set upper limit of the set pressing force, it is determined whether the machine continues to be operated without correcting the pressing force. That is, when the detected pressing force is in the range of the upper limit of the set pressing force and in the lower limit, and in the unnecessary range of the correction, it is determined that the machine can continue operation, and the process proceeds to step 204 to continue the operation.

When the detected pressing force is within the lower limit of the set upper limit of the set pressing force but outside the range where the correction is unnecessary, it is determined that the pressing force is required to be corrected and the process proceeds to step 205.

The process 205 is for operating the servomotor 25 to correct the pressing force.

If the detected pressing force in step 205 is outside the upper limit of the range in which the pressing force correction is not necessary, the process proceeds to step 206 and the servo motor 25 is operated so that the pressing force is adjusted to fall within an unnecessary range. Lower the height (H). If the detected pressing force is less than the lower limit of the range that does not require the correction of the pressing force, the process proceeds to step 207 where the servo motor 25 is rotated in the reverse direction, so that the die height H is set so that the correction of the pressing force is not necessary. Raise).

In either case, after passing through step 206 or step 207, the process returns to step 203.

The above-mentioned automatic adjustment of the pressing force is performed after the press work of the workpiece is finished and before the start of the next press work. Therefore, the pressing force is automatically detected at the end of each press working process, and the pressing force is automatically corrected as necessary.

Therefore, an appropriate pressing force is always obtained in any press working process.

As described above, according to the second embodiment of the present invention, in the case of a press machine, when the bottom dead center pressing force of the sliding member is automatically detected, and the detected pressing force is out of the range that does not require correction of the pressing force. The height direction position of the sliding member is appropriately and automatically adjusted as the die height is automatically raised and lowered based on the pressure detection signal.

For this reason, it is possible to efficiently and reliably solve the cause such as the residual damage required for setting the die height, which is a problem in the related art, and the cumbersome skill required for the operation, resulting in poor production efficiency. In addition, when the machine is overloaded, there is no need to stop the operation of the machine each time as in the prior art, and thus the productivity is further improved.

In addition, this invention is not limited to the thing of each Example mentioned above, It can change and adopt arbitrarily and suitably as needed within the range which does not deviate from the summary of this invention.

Claims (16)

An arm member 2 pivotally attached about an axis 1, and pivotally connected at one end connection portion 3 of the arm member 2 and connecting the arm member 2 to the shaft 1. In the driving force transmission member (4) for transmitting the driving force for swinging around), the other end side connecting portion (5) of the arm member (2), at least a sliding member (6) pivotally connected, The worm wheel 23 and the worm gear 24 engaged with the worm wheel 823 are rotated by rotating the core of the shaft in a predetermined amount with respect to the axis of the shaft 1, and the worm wheel 24 engaged with the worm wheel 833. A device for adjusting the attachment position of a reciprocating sliding member having drive means (25, 26) for rotating the work (23). 2. The driving force transmission member (4) according to claim 1, wherein the driving force transmission member (4) comprises a connecting rod (4), one end of which is connected to one end of the arm member (2) at the connecting portion (3). And a pivot 31 is pivotally connected, and is configured to reciprocate in the longitudinal direction by the action of a drive source. 2. The other end connection portion 5 of the shanghai arm member 2 comprises a link 52, the link 52 being equal to the shaft 53 on the other end side of the arm member 2. Is pivotally connected by the other end, and the other end is pivotally connected to the sliding member (6) by a shaft (51). 3. The driving means (25, 26) according to claim 2, comprising a servo motor (25) and a coupling (26) for transmitting the rotational driving force of the servo motor (25) to the worm gear (24). Attachment position adjusting device of the reciprocating sliding member characterized in that. Pivotable at one end of the arm member (2) pivotally attached to the machine body (14) including a base (8), an axis (1) located in the center of the longitudinal direction, and In the driving force propelling member 4 for transmitting the driving force for oscillating the arm member 2 around the shaft 1, and in the connecting portion 5 on the other end side of the arm member 2. A sliding member 6 having at least one pivotable connection and a movable upper die 63 fixed at the other end and reciprocating according to the swing of the arm member 2, and the base of the machine body 14 A fixed lower die 10 for pressing the movable upper die 63 and the workpiece by a reciprocating motion of the sliding member 6, and a rotating shaft core on the shaft 1; Engaged with the worm wheel 23 and the worm wheel 23 fixed and eccentrically fixed with respect to the shaft center of (1). A press machine having drive means (25, 26) for rotating the worm gear (24) to rotate the worm wheel (23). 6. The machine body (14) according to claim 5, wherein the machine body (14) has an upper frame (7) fixed through the base (8) side frame (13), and the arm member (2) is the upper frame (7). Located at the upper side of the sliding member 6 is connected to the other end side of the arm member 2 and the connecting portion 5, and the shank extending through the through hole provided in the upper frame (7) ( 61) and an attachment member (62) for attaching the movable upper die (63) to the other end of the shank (61). 7. Press machine according to claim 6, characterized in that the sliding member (6) slides on a guide member (11) fixed on the base (8) of the machine body (14). 8. The base (8) of the machine body (14) according to claim 7, wherein the base (8) holds a predetermined number of pole-shaped guide members (11), and the attachment member (62) is fitted with the guide member (11) to guide the And a guide part (62a) which slides on the member (11). The pressing force detecting step of detecting the pressing force occupied by the sliding member 6 at the bottom dead center of the sliding member 6, and the measured value of the pressing force detected in the pressing force detecting step is outside the upper and lower limits of the allowable pressure range. And adjusting the position at the bottom dead center by raising and lowering the sliding member (6) by a predetermined amount based on the measured value of the pressing force. 12. The sliding member (6) according to claim 11, wherein a strain gauge is applied as the pressing force detecting means in the pressing force detecting step, and the servo motor (25) is rotated in accordance with the pressing force detecting signal obtained by the strain gauge. A method for automatically adjusting the mounting position of a reciprocating sliding member, characterized by automatically lifting up and down. A sliding member 6 which is installed reciprocally and pressurizes the workpiece at the bottom dead center, reciprocating drives 2, 3, 4, and 5 for reciprocating the sliding member 6, and the sliding member 6 The lower dead center position of the sliding member 6 is automatically raised and lowered on the basis of the pressing force automatic detection unit 29 which automatically detects the pressing force at the bottom dead center of Press machine with an adjusting mechanism 20 to make. The reciprocating drive mechanism (2, 3, 4, 5) is an arm member (2) arranged pivotally about an axis (1), and one end side of the arm member (2). And a sliding force member (4), wherein said sliding member (6) is pivotally connected to the other end side of said arm member (2). The member for transmitting the driving force according to claim 13, wherein the adjustment mechanism (20) is arm member (2) pivotally arranged about the shaft (1) and pivotally connected to one end of the arm member (2). (4), one end side of the sliding member (6) is pivotally connected to the other end of the arm member (2), the shaft (1) shaft center of the arm member (82) and the rotating shaft (21) The rotation axis of the worm wheel 23 is fixed to the shaft 1 of the arm member 2 by eccentrically the axial center of the arm member 2, and the worm gear 24 meshes with the worm wheel 23. Press machine characterized in that the servo motor 25 is connected to (24). The driving force transmission member (4) according to claim 14, wherein the driving force transmission member (4) includes a connecting rod (4), and one end of the connecting rod (4) is connected by one end of the arm member (2) and the shaft (31). A press machine which is pivotally connected and reciprocates longitudinally by the action of a drive source. The other end connecting portion 5 of the arm member 2 comprises a link 52, the one end of which is connected to the shaft at the other end of the arm member 2. 53) pivotally connected, the other end being pivotally connected to the sliding member (6) by a shaft (51). 18. The servomotor (25) according to claim 17, wherein the pressing force detector (29) holds a strain gauge and drives the servomotor (25) by outputting a pressing force detection signal obtained by the strain gauge to the servomotor (25). Press machines.