JP2002036000A - Link adjustment member - Google Patents

Abstract

An adjustable drive mechanism for a mechanical press having the ability to change the position of a drive gear relative to a crankshaft without disassembling the press. A driving pinion (50) rotates a main gear (62). The rotation of the main gear drives a crankshaft (54) via a gear link (58) and a crank link (60).
2 to drive the slide 44. By changing the position of the link drive 52 with respect to the drive pinion 50 and the crankshaft 54, the drive mechanism is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical press, and more particularly to the adjustment of the press drive and the non-resolved modification of the corresponding slide displacement versus gear angle curve.

[0002]

2. Description of the Related Art Mechanical presses of the type that perform punching and drawing operations include a frame structure having a crown and a bed portion, and employ a conventional structure for supporting a slide in reciprocating motion with respect to the bed. The press drive assembly including the main gear and the crankshaft is devised to convert the rotation-vibration movement into a linear reciprocation of the slide. These press machines are widely used because the size of the press machine and the usable load are greatly changed depending on the application because the die set selection range is increased and a wide variety of work pieces are processed.

[0003] Mechanical presses, such as stamping and drawing presses, have a main gear that imparts rotational movement to a crankshaft. The crankshaft has an eccentric part or eccentric crank link, which converts the rotational movement of the crankshaft into a reciprocating mechanical action, which is transmitted to the slide through the connecting arm. One complete revolution of the crankshaft results in one complete reciprocation of the slide. Depending on the type of drive mechanism used, the crankshaft can maintain a steady or irregular rotational speed. The random rotational speed of the crankshaft is advantageous for press applications where the slide speed must be reduced near the bottom of the stroke (ie, at the center of the lower dead center) so as not to exceed the material drawing speed. In addition, the slide speed reduction near the bottom of the stroke reduces die fatigue, press vibration and noise. Presses that utilize various contrivances to produce irregular rotational speeds of the crankshaft are known to those skilled in the art.

[0004] A standard press arrangement for producing a steady rotational speed of the crankshaft comprises an arrangement of a crankshaft and a main gear in which the crankshaft and the main gear are concentric. Irregular rotational movement of the crankshaft of a mechanical press can be obtained by changing the arrangement of the crankshaft and the main gear such that the crankshaft and the main gear are eccentric and connected by a link drive assembly. Devices such as link drives produce random rotational motion which is beneficial in that it can be used to reduce the speed of the slide near the center of bottom dead center so as not to exceed the withdrawal speed of a particular material. Such an arrangement is beneficial in that they also reduce die fatigue, press vibration and noise.

[0005] Depending on whether a link drive arrangement or a slider crank drive arrangement is used, a press using similar sized main gears for a particular work piece would be suitable. The ability to change the drive mechanism of the mechanical press from slider crank drive to various link drive arrangements,
This is advantageous in that one specific press can be used for various operations. The desire to create a multi-purpose mechanical press,
A working modular unit was derived. These modular unit presses can change the drive mechanism inserted so that the press operates as a pure slider crank drive or, alternatively, as a linked drive. Various modular units can be used to generate various link drive configurations and shapes.
In other words, the distance between the centerline of the crankshaft and the centerline of the main gear is different and at the same time a variable length link is used. The link length, as well as the distance between the main gear centerline and the crankshaft centerline, is changed according to the modular unit chosen, but only by the steps defined by the particular modular unit manufactured and used. Can be

The ability to change the drive or press in such a way makes the press more versatile in its application, but the disadvantage is that the press must be shut down for an extended period of time to make this adjustment. . Press downtime occurs between drive mechanism changes. A storage location for a number of modular units must also be provided. In addition, the press installation location must also have enough room above the crown to allow for removal and insertion of various drive mechanisms. Currently, press buyers have to accept the difficulties described above using the drive mechanism originally provided with the press or utilizing a press that provides various modular units.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to an improvement of the above-described mechanical press drive adjusting mechanism, which is desired to adjust the drive mechanism of the mechanical press without stopping and without storing the mechanical parts. . The present invention provides an adjustable drive mechanism for a mechanical press with the ability to change the position of the drive gear relative to the crankshaft without disassembling the press.

[0008]

SUMMARY OF THE INVENTION In one aspect, the present invention includes an adjustable drive mechanism for a press. The adjustable drive mechanism includes a link drive and a crankshaft connected to the link drive. Using the adjusting means, the position of the link drive is adjusted with respect to the crankshaft so that the curve of the slide speed of the press versus the distance between the centers of the bottom dead centers is changed. This adjusting means changes the position of the link drive without disassembling the press.

The invention, in another form thereof, includes an adjustable drive mechanism for a press that includes a link drive, a crankshaft, and a drive pinion. The drive pinion has a centerline that defines a drive pinion rotation axis. The adjusting means changes the position of the link drive without disassembling the drive mechanism. As the position of the link drive changes, the slide speed of the press versus the bottom dead center center separation curve changes. In this form of the invention,
The adjusting means rotates the link drive about the drive pinion centerline.

In one embodiment of the present invention, the link drive comprises:
Includes a main gear having a centerline, a gear link, a crank link and a crankshaft. A first end of the gear link is pivotally connected to one end of an eccentric portion of the main gear. The second end of the gear link is pivotally connected to the first end of the crank link. The second end of the crank link is pivotally connected to the crankshaft.

The invention, in another form thereof, includes an adjustable drive mechanism for a press. In this form, the adjustable drive mechanism includes a link drive, a crankshaft, a drive pinion, and adjustment means. The drive pinion has a centerline that defines its axis of rotation. The adjusting means rotates the link drive about the drive pinion centerline. The adjusting means can be, for example, a sector gear and a rotating means for rotating the sector gear about the drive pinion centerline. The sector gear has the same rotation axis as the drive pinion and supports the main gear so that it can rotate. The rotating means can be, for example, a sector gear drive pinion, a hydraulic adjusting means or a screw adjusting means. When using a sector gear drive pinion as the rotating means, the sector gear drive pinion selectively rotates the sector gear about the drive pinion centerline.
The hydraulic and / or threaded adjusting means (when employed) have a first end operatively connected to the press and a second end operatively secured to the eccentric portion of the sector gear. And
Actuation of the hydraulic and / or threaded adjustment means causes the sector gear to rotate about the drive pinion centerline. Mounting means may be used to secure the sector gear to the press during the press operation. The mounting means may be, for example, an axially movable clamp.

The invention, in another form thereof, includes an adjustable drive mechanism for a press that includes a link drive, a crankshaft, a drive pinion, and adjustment means. This adjustment means is used to change the position of the link drive, which in turn changes the slide speed of the press versus the bottom dead center center separation curve. This adjusting means can be used to change the position of the link drive without requiring disassembly of the drive mechanism. A drive pinion is used to drive the link drive. The drive pinion has a centerline that defines the axis of rotation of the drive pinion. Adjusting means rotates the link drive about the center line of the drive pinion. The link drive includes a main gear having a centerline, a gear link and a crank link. The gear link has a first end pivotally connected to an eccentric portion of the main gear. The second end of the gear link is pivotally connected to the first end of the crank link.
The second end of the crank link is connected to the crankshaft. In one aspect of the invention, the center line of the drive pinion and the center line of the main gear form a substantially horizontal line when the main gear is concentric with the crankshaft.

The invention, in another form thereof, includes a method of changing the drive mechanism of a mechanical press. In this aspect, the method includes providing a drive mechanism including a drive pinion, a main gear driven by the drive pinion, and a crankshaft driven by the main gear, and changing a position of the main gear relative to the drive pinion. , Each step. In one aspect of the invention, changing the position of the main gear relative to the drive pinion includes rotating the main gear around the drive pinion.

The invention, in another form thereof, includes a method that includes the step of rotating a main gear about a drive pinion. In this aspect of the invention, rotating the main gear around the drive pinion includes providing a sector gear, using the sector gear to support the main gear so that it can rotate, and rotating the sector gear to the drive pinion. Rotating around.

The invention, in another form thereof, includes a method of altering a drive mechanism of a mechanical press that includes rotating a main gear about a drive pinion. In one aspect of the invention, rotating the main gear about the drive pinion includes providing a sector gear, supporting the main gear so that the main gear can be rotated using the sector gear, and rotating the sector gear to the drive pinion. Rotating around. In one aspect of the invention, rotating the sector gear about the drive pinion includes providing a sector gear drive pinion, engaging the sector gear drive pinion in driving relationship with the sector gear, and defining the sector gear drive pinion. Operating each of the steps.

The invention, in another form thereof, includes a method of modifying a drive mechanism of a mechanical press that includes rotating a main gear about a drive pinion. In one aspect of the invention, rotating the main gear around the drive pinion includes providing a sector gear, supporting the main gear so that it can rotate using the sector gear, and rotating the sector gear around the drive pinion. And rotating at each step. In one aspect of the invention, the step of rotating the sector gear about the drive pinion includes the steps of providing hydraulic adjustment means, connecting the hydraulic adjustment means to the press, and connecting the hydraulic adjustment means to the sector gear. And rotating the sector gear by operating the hydraulic adjustment means.

The invention, in another form thereof, includes a method of changing the drive mechanism of a mechanical press that includes rotating the main gear about a drive pinion. In one aspect of the invention, rotating the main gear around the drive pinion includes providing a sector gear, supporting the main gear so that it can rotate using the sector gear, and rotating the sector gear around the drive pinion. And rotating at each step. In one aspect of the invention, rotating the sector gear about the drive pinion includes providing a threaded adjustment, connecting the threaded adjustment to the press, and connecting the threaded adjustment to the sector gear. And actuating the screw-type adjusting means to rotate the sector gear.

The invention, in another form thereof, includes a press. The press includes a crown and a crankshaft rotatably supported by the crown. The drive pinion is mechanically connected to the crankshaft. This drive pinion has a centerline defining its axis of rotation. The main gear is driven by a drive pinion. The main gear is rotated about the drive pinion centerline using a sector gear. When not used to rotate the main gear, the sector gear is fixedly supported by the crown and supports the main gear so that it can rotate during the press operation. The sector gear is arranged to be supported by the crown so that it can rotate when used to rotate the main gear. When the main gear is not rotating, the sector gear is fixedly supported by the crown. As the main gear rotates, the press slide speed versus bottom dead center center separation curve changes. Mounting means are used to secure the sector gear to the press during press operation. This mounting means can be, for example, an axially movable clamp. The sector gear drive pinion selectively rotates the sector gear about the drive pinion centerline. In this way,
The sector gear drive pinion operates the sector gear so that the sector gear rotates the main gear. The main gear is connected to the crankshaft through a link device such that rotation of the main gear converts the drive mechanism of the mechanical press from a slider crank to a modified link drive arrangement.

An advantage of the present invention is the ability to produce a versatile press having a drive mechanism that can be changed from a pure slider crank to a link drive mechanism without disassembly so that press downtime is effectively reduced or eliminated. . Another advantage of the present invention is that application flexibility for mechanical presses is obtained without the purchase and storage of many different modular drive units. Another advantage of the present invention is that the drive mechanism of the mechanical press can be adjusted from a slider crank configuration to a multiple link drive configuration. Yet another advantage of the present invention is that the upper ceiling height of the flexible drive press does not need to be increased.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention, and the manner of achieving them, will be more apparent from the following description of the invention when taken in conjunction with the accompanying drawings, in which: FIG. Will be better understood. Throughout the drawings, the same reference characters indicate the same parts. The exemplification set forth herein is a preferred embodiment of one aspect of the present invention, and is not meant to limit the scope of the invention in any way.

Referring now to the drawings, and particularly to FIG. 1, the mechanical press 20 comprises a crown 22, a bed 24 having a bolster 26 connected to the bed, and an upright column 28 connecting the crown 22 to the bed 24. . Upright pillar 2
8 is connected to the lower side of the crown 22 and the upper side of the bed 24. Tie rods (not shown) extend through crown 22, upright columns 28 and bed 24 and tie rods
With nut (not shown). The leg member 32 is the bed 2
4 and is typically attached to the factory floor 34 using shock absorbing pads 36. A drive mechanism, such as a press drive motor 38, drives a drive pinion 50.
Is given a rotational movement (FIG. 2).

Referring now to FIG. 2, the drive pinion 5
0 drives the link drive 52. A link drive 52 drives a crankshaft 54. The present invention provides a method and apparatus for drive mechanism adjustment of a mechanical press. By changing the position of the link drive 52 with respect to the drive pinion 50 and the crankshaft 54, the drive mechanism is adjusted. When the position of the link drive 52 is changed, the drive of the press is changed from the slider crank drive to the variable link drive arrangement.

The link drive 52 includes a main gear 62, a gear link 58, and a crank link 60. Drive pinion 50 imparts rotational movement to main gear 62. The gear link 58 is pivotally connected at one end to an eccentric portion of the main gear 62. The opposite end of gear link 58 is pivotally connected to one end of crank link 60. Crank link 6
The other end of 0 is fixedly connected to the crankshaft 54. In this manner, rotational energy from the drive pinion 50 is given to the main gear 62 and further to the crankshaft 54. A crank link 56 is fixedly connected to the crankshaft 54 and is pivotally connected to the connecting rod 42. Connecting rod 4
2 is then connected to a slide 44.

As shown in FIG. 3, the drive pinion 50 is fixedly mounted on the drive shaft 64. Crown 22 includes a drive shaft 64 and a sector gear support 66. Sector gear 68
The drive shaft 64 is rotatably supported by the drive shaft and the sector gear support 66.

As shown in FIG. 4, while maintaining the drive connection between the drive pinion 50 and the link drive 52, the link drive 5
To change the position of 2, an adjusting means, for example a sector gear 68, is used. The sector gear 68 is connected to the drive pinion 50.
Has the same rotation axis as. The sector gear 68 includes the main gear 62.
Is rotatably supported, and the main gear 62 is selectively rotated around the drive pinion center line 74.

FIG. 5 shows the configuration of the present invention when the drive pinion 50 and the link drive 52 are arranged to produce slider crank motion in a mechanical press. In this configuration, the link drive 52 is substantially concentric with the crankshaft 54. FIG. 6 shows the configuration of the drive mechanism when the sector gear changes the position of the link drive 52 and sets the quick return drive for the mechanical press. In this configuration, the link drive 52 is eccentric with respect to the crankshaft. Since the sector gear 68 supports the main gear 62 so as to be rotatable, the sector gear 68 can function to change the position of the link drive 52. When the sector gear 68 is not used to execute the position change of the link drive 52, the mechanical press 2 is not used.
Fixed to frame 0.

FIG. 7 shows a sector gear 68 including a rotation means for rotating the sector gear. The rotating means can be, for example, a sector gear drive pinion 70, a screw type adjusting means 80, or a hydraulic type adjusting means 82. The hydraulic adjustment device is, for example, a hydraulically operated piston / cylinder device. The sector gear drive pinion 70 is placed in a driving relationship with the sector gear 68 to effect rotation of the sector gear 68. The screw type adjusting means 80 or the hydraulic type adjusting means 82
May be used for the rotation of. Hydraulic adjustment means 82 and threaded adjustment means 80 are pivotally connected to sector gear 68 and to the press frame. Actuation of these devices causes rotation of the sector gear 68.

FIG. 7 also shows the mounting means employed with the sector gear 68. The mounting means is used to fix the sector gear 68 to the press 20 when the sector gear 68 is not being used to change the position of the main gear 62. The attachment means can be, for example, an axially movable clamp 72. The axially movable clamp 72 is displaced in the axial direction so as to mesh with the receiving hole of the press 20 or the sector gear 68 as necessary. The axially movable clamp 72 also engages the press 20 as necessary to engage the sector gear 68 with the press 20.
May be used. The locking mechanism described above is illustrative only and is not meant to limit the scope of the invention in any way. Many fastening structures are known and can be used to couple sector gear 68 to press 20.

FIGS. 8 and 9 are schematic representations of various drive configurations of the present invention. FIG. 8 shows a quick return drive configuration when the main gear 62 is actually decentered from the crankshaft 54 after the position change. As shown in FIG. 8, the drive gear pinion centerline 74 and the crankshaft centerline 78 maintain their positions, while the main gear centerline 76 has changed position and, more specifically, the distance from the crankshaft centerline 78. D has been moved. FIG. 9 shows the configuration of the drive mechanism of the present invention when the main gear 62 is kept eccentric with the crankshaft 54. In this configuration, the drive mechanism of the mechanical press operates to generate a slider crank motion.

FIGS. 10 and 11 are graphical representations of the slide position of the mechanical press at the bottom dead center center distance versus gear angle. FIG. 10 shows the slider crank curve and
3 shows a curve corresponding to a specific direction of the drive mechanism according to the invention, which produces a curve almost identical to the slider crank curve. FIG.
Also shows a substantially non-identical curve which is generated by the arrangement of the present invention and which is consistent with the quick return drive arrangement. In FIG. 11, the slider crank curve of FIG.
Curves corresponding to the configuration of the drive mechanism as shown in FIG. 9 of the present invention are superimposed and are almost the same as shown here.
FIG. 11 additionally shows the quick return drive arrangement of the present invention as shown in FIG. The adjusting member of the present invention,
A sliding position varying between the two curves shown in FIG. 11 can be used to generate a bottom dead center center separation versus gear angle curve.

During the press operation, a controller, operator or other mechanism activates the adjusting means. Actuation of the adjusting means changes the position of the link drive 52, thereby changing the distance D between the main gear centerline 76 and the crankshaft centerline 78. As the distance D between the main gear centerline 76 and the crankshaft centerline 78 increases, the drive mechanism provides a slower sliding motion when the slide approaches the center of the bottom dead center and a movement of the slide toward the center of the upper dead center. And a slide motion composed of a fast slide motion when the ball is moved. FIG. 12 shows such a “quick return”
4 shows a slide speed curve. As shown in FIG. 12, the slide speed vs. bottom dead center center separation curve is such that the speed vs. bottom dead center center separation distance is a slide crank curve and the link drive 52 is permitted by the adjusting means of this embodiment of the present invention. It can be changed to any curve between the curve related to the drive configuration when the maximum position change is received. The adjustment ranges illustrated in this description are by way of example only and are not intended to be limiting in any way.

Although the invention has been described as having a preferred design, the invention can be further modified within the spirit and scope of the invention. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. In addition, this application is intended to cover any departures from the invention that fall within the scope of known or routine practice in the art related to the invention and that fall within the scope of the appended claims.

[Brief description of the drawings]

FIG. 1 is a three-dimensional front view of a mechanical press incorporating a link adjusting member of the present invention.

FIG. 2 is a perspective view of one embodiment of the present invention.

FIG. 3 is a perspective view of one embodiment of the present invention.

FIG. 4 is a perspective view of one embodiment of the present invention including the adjusting means of the present invention.

FIG. 5 is a perspective view of the main gear and the pinion of the present invention when the main gear is concentric with the crankshaft.

FIG. 6 is a three-dimensional view of one embodiment of the present invention including the main gear and the pinion when the main gear is adjusted so that the main gear is eccentric from the crankshaft.

FIG. 7 is a perspective view of one form of the present invention including an axially movable clamp for securing a sector gear to a crown or frame.

FIG. 8 is a diagrammatic representation of the present invention when the drive is adjusted to produce a quick return sliding movement.

FIG. 9 is a diagrammatic representation of the present invention when the drive is adjusted to produce a slider crank drive configuration.

FIG. 10 is a pictorial representation of sliding position bottom dead center center separation versus gear angle for various drive arrangements.

FIG. 11 is an illustration of slide position bottom dead center center separation vs. gear angle, including a curve representing the slider crank configuration of the adjustable drive mechanism and a curve representing the link drive arrangement of the adjustable drive mechanism. It is an expression.

FIG. 12 is a pictorial representation of a slide speed with respect to the center separation of the slide at the bottom dead center.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J033 AA02 CA04 4E089 EA01 EB01 ED08 EE03 4E090 AA01 AB01 BA02 CB04 CC01

Claims (18)

[Claims] 1. An adjustable drive mechanism for a press including a slide, comprising a link drive, a crankshaft connected to the link drive, and the crank of the link drive without disassembling the drive mechanism. Adjusting means for changing the position of the link drive relative to the axis, wherein the relative position change of the link drive changes the slide speed of the press versus the bottom dead center separation curve. 2. A drive pinion having a center line,
2. The adjustable drive mechanism of claim 1, wherein said centerline of said drive pinion defines an axis of rotation of said drive pinion, and said adjusting means further comprises a drive pinion for rotating said link drive about said centerline. 3. The link drive wherein the link drive is a main gear having a centerline and a gear link having a first end and a second end, wherein the first end of the gear link is eccentric to the main gear. A crank link having a gear link pivotally connected to a portion and a first end and a second end, wherein the first end of the crank link is pivotally connected to a second end of the gear link. And a crank link, wherein the crankshaft is connected to a second end of the crank link. 4. A sector gear, wherein said adjusting means has the same rotation axis as said drive pinion and supports said main gear so as to be rotatable, and a rotation for rotating said sector gear around said drive pinion center line. 3. The adjustable drive mechanism of claim 2, including means. 5. The adjustable drive mechanism of claim 4, wherein said rotating means comprises a sector gear drive pinion, said sector gear drive pinion selectively rotating said sector gear about said drive pinion centerline. 6. The hydraulic adjusting means having a first end and a second end, wherein the first end of the hydraulic adjusting means is operatively connected to a press, and 5. The adjustable drive mechanism of claim 4, wherein said second end of said adjustable adjustment means includes hydraulic adjustment means operatively secured to an eccentric portion of said sector gear. 7. The screw-type adjusting means having a first end and a second end, wherein the first end of the screw-type adjusting means is operatively connected to a press, and 5. The adjustable drive mechanism of claim 4, wherein said second end of said adjustable adjustment means includes screw-type adjustment means operatively secured to an eccentric portion of said sector gear. 8. The adjustable drive mechanism of claim 4, further comprising mounting means for securing said sector gear to the press during a press operation. 9. The adjustable drive mechanism of claim 7, wherein said mounting means includes an axially movable clamp. 10. The adjustable drive mechanism of claim 3, wherein the center line of the drive pinion and the center line of the main gear form a substantially horizontal line when the main gear is concentric with the crankshaft. 11. A step of preparing a drive mechanism including a drive pinion, a main gear driven by the drive pinion, and a crankshaft driven by the main gear, and changing a position of the main gear with respect to the drive pinion. And a method for changing the drive mechanism of the mechanical press including the steps of: 12. The method of claim 11, wherein changing the position of the main gear with respect to the drive pinion comprises rotating the main gear about the drive pinion. 13. The step of rotating the main gear around the drive pinion includes the steps of providing a sector gear, using the sector gear to rotatably support the main gear, and driving the sector gear of the drive pinion. 13. The method of claim 12, further comprising: rotating around. 14. The step of rotating the sector gear around the drive pinion includes providing the sector gear drive pinion, engaging the sector gear drive pinion in driving relationship with the sector gear, and driving the sector gear drive pinion. Actuating further comprising the steps of:
Method 3. 15. The step of rotating the sector gear about a drive pinion includes providing a hydraulic adjustment means, connecting the hydraulic adjustment means to a press, and connecting the hydraulic adjustment means to the sector gear. Actuating hydraulic adjusting means to rotate the sector gear; and
14. The method of claim 13, further comprising the steps of: 16. The step of pivoting the sector gear about a drive pinion includes providing a screw-type adjustment means, and connecting the screw-type adjustment means to a press.
14. The method of claim 13, further comprising the steps of: connecting the screw-type adjustment means to the sector gear; and activating the screw-type adjustment means to rotate the sector gear. 17. A drive pinion having a crown, a drive shaft rotatably supported by the crown, and a center line, the center line defining a rotation axis of the drive pinion, wherein the drive shaft is A mechanically coupled drive pinion, a main gear driven by the drive pinion, and a sector gear for rotatably supporting the main gear, the fan gear being rotatably supported by the crown for selective rotation; When the main gear is selectively rotated about the center line of the drive pinion, the rotation of the main gear causes the slide speed of the press versus the lower dead center center separation. Is changed, and the rotation of the sector gear rotates the main gear, so that the crown fixes and supports the sector gear during the press operation, A gear for supporting the main gear so as to be rotatable; mounting means for fixing the sector gear to a press during a press operation; and a sector for rotating the sector gear around a center line of the drive pinion. A gear link having a gear drive pinion, a first end and a second end, wherein the first end of the gear link is pivotally connected to an eccentric portion of the main gear; A crank link having an end and a second end, wherein a first end of the crank link is pivotally connected to the second end of the gear link; A crankshaft fixedly attached to the second end, the crankshaft rotatably supported by the crown. 18. The press of claim 17, wherein said mounting means includes an auxiliary movable clamp.