JPH04105799A - Device for adjusting length of slide stroke in press machine - Google Patents

Abstract

PURPOSE:To miniaturize a press machine and to quickly and easily execute multi-stage stroke adjustment while achieving the enlargement of effective space in a inside part by providing eccentric bush shifting means for selectively shifting the eccentric bush to the connecting rod side or a crank shaft side and providing this means in the connecting rod. CONSTITUTION:At the time of supplying oil pressure into a cylinder chamber 41 from an oil hole 45, an external gear 25 and an internal gear 35 are disconnected and the internal gear 21 at an eccentric bush 20 side is engaged with an external gear 11 at the crank shaft 1 side. The eccentric bush 20 and an eccentric part 10 are integrally connected while holding relative position after adjusting. Thereafter, by rotating the crank shaft 1, as the eccentric bush 20 and the eccentric part 10 are integrated the stroke movement is executed to the connecting rod 30 through sliding face C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slide stroke length adjusting device for a press machine.

[Conventional technology] FIG. 3 shows a crank-driven press machine.

1 is a crankshaft having an eccentric portion 10, 5 is a slide, 6 is a bolster, 7 is a flywheel, and slide 5
is subjected to a stroke (ST) movement by a connecting rod 3o rotatably supported by a connecting portion A with the eccentric portion 10. Therefore, if the amount of damage of the crankshaft 1 with respect to the axis 0 is el, the vertical stroke ST of the slide 5 is 2e+
It is.

In such a press machine, as shown in FIG. 4, an eccentric bushing 20 (hatched in FIG. 4 for convenience) is interposed in the connecting portion A, and the eccentric portion 10 of the eccentric bushing 20 is
A slide stroke length adjusting device is provided which is configured to be able to adjust the stroke ST by changing the relative position to the stroke ST.

That is, as shown in FIGS. 4(A) and 4(B), when the crankshaft 1 (I core part 10) is fixed and the relative position (angle) of the eccentric bushing 20 is changed, the crank jab l~( Axis 0)1. m the centers of the central part 10 and the eccentric bushing 20 are O, P, Q, the eccentricity of the eccentric part 10 alone with respect to the center 0, e the eccentricity of the eccentric bushing 20 alone with respect to the center P is C2, and both of them are 10.20. If connected with the connecting pin 15, the actual eccentricity E with respect to the center O in the case of FIG. 4(A) is e 1+ 62, which is 2
This can be doubled to make the stroke the longest.

On the other hand, in the case of (B), the actual eccentricity E is e1e2, which is twice the difference between the two individual eccentricities, and the stroke length is the minimum C2xE].

Therefore, if the relative position of the eccentric bushing 20 is changed,
Maximum C2X (e+ +ex)] ~ Minimum [2(e,
The stroke adjustment length can be adjusted between -C2)).

In the past, such a sliding stroke length adjustment device included a means for connecting and separating the crankshaft 1 (eccentric C section 10) and the eccentric bushing 20, a means for fixing one of them in the separated state, and a means for moving the other one relative to each other. A means for rotating is essential.

Here, conventionally, such coupling/separation means, etc., are connected to the eccentric part 10.
．． Eccentric bushing 20. A connecting pin 15 disposed at a location separate from the connecting rod 30 and displaceably incorporated into the eccentric portion 10 is formed to protrude and retract.

In detail, for example, in the case of Japanese Patent Publication No. 51-12150, an eccentric pin 15 attached to a long pin (connecting pin) 9
The spring 1 is rotated by a long spindle 15.2221 driven by an externally provided gear mechanism 31, 33, etc.
They are appearing against the urging force of 2. Similarly, a rotating disk 40 . Eccentric pin 411 ports/77
The eccentric bushing 6 is fixed by a fixing means consisting of 39 equivalent force). In addition, these gear mechanisms 31.3
3 etc. and the fixing means 40 etc. are stored in the zinc 46.2t.

[Problem to be solved by the invention 1 As described above, the conventional slide stroke length adjusting device
In addition to installing the pin 15 into the crankshaft 1,
Most of the components (connection/separation means.

Since the fixing means, housing, etc.) are arranged externally, there is a disadvantage that the press becomes large. In addition, in today's world, automation, labor-saving, and multi-functionality have increased the density of mounting a single component of equipment, piping, wiring, etc. inside a crown, and it has become extremely difficult to design space for these components. ing.

In addition, the pin holes for inserting the pins 15 must be provided in multiple stages in the eccentric bushing 20, making it difficult to construct the I! Not only is this disadvantageous in terms of mechanical strength, but it is also extremely difficult to align the pin 15 and the pin hole, resulting in excessive equipment costs, poor workability, and only multi-step stroke adjustment possible.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slide stroke length adjusting device for a press machine that is easy to handle and that does not require external installation space and can quickly and easily perform multi-stage stroke adjustment.

Means for Solving Problem 1] The present invention provides that the relative rotation between the crankshaft and the eccentric bushing is more advantageous if the crankshaft side is rotated, and that the connecting rod is an essential component of the crank drive system. Focusing on the fact that the eccentric bushing does not move on its own, the eccentric bushing is attached so that it can move in the axial direction, and the connecting rod is used as a means for fixing the eccentric bushing.
In addition, the eccentric bush moving means is housed within the connecting rod to achieve the above object.

In other words, the slide stroke length of a press m machine that is formed to adjust the slide stroke by changing the relative position of the eccentric bushing interposed in the connection between the eccentric part of the crankshaft and the connecting rod 5. In the height adjustment device, the eccentric bushing is mounted so as to be movable in the axial direction of the crankshaft, and the eccentric bushing is provided with an internal gear and an external gear, and the internal gear is connected to the connecting rod. An eccentric bush moving means for selectively moving the eccentric bush so as to mesh with an external gear provided on the crankshaft 1ull or to mesh the external gear with an internal gear provided on the connecting rod side is installed. It is characterized by:

[Function] In the present invention, when adjusting the stroke length, the eccentric bushing is first moved by the eccentric bushing moving means so that the external gear of the eccentric bushing meshes with the internal gear on the connecting rod side. This allows the eccentric bushing to be fixed to the connecting rod, which is a stationary body.

By rotating the crankshaft, the relative position between the eccentric portion and the eccentric bushing, that is, the actual amount of eccentricity, can be changed, and the length of the slide stroke can be adjusted.

Thereafter, the eccentric bush moving means is reversely operated to mesh the internal gear of the eccentric bush with the external gear on the crankshaft side. At this time, the external gear of the eccentric bushing comes off from the internal gear on the connecting groove I side.

Therefore, the crankshaft (eccentric part) and the eccentric bushing are integrally connected while maintaining their adjusted relative positions, and thereafter press operation can be performed with the adjusted stroke.

[Actual rope example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, an external gear 11 is fixed on the eccentric portion 10 side of the crankshaft 1, and a connecting rod 30
An internal gear 35 is fixed on the side.

Here, an external gear 25 that can mesh with the internal gear 35 is provided on one end side of the eccentric bush 20 interposed in the connecting part A of both 10.30, and an external gear 25 that can mesh with the internal gear 35 is provided on the other end side. An internal gear 21 that can mesh with the internal gear 11 is provided. Gear 11.
After 21 (25, 35) comes off, the gear 25.35 (
11, 21), the meshing gear and the tooth width are determined. Note that each gear can be provided all around or partially.

When the gear 11.21 is engaged, the outer circumferential surface of the eccentric bushing 20 becomes the sliding surface C, and both 10.20 move together, and when the gear 25.35 is engaged, the inner circumferential surface of the eccentric bushing 20 becomes the sliding surface C. The eccentric bushing 20 becomes a sliding surface B and rotates relative to the crankshaft 1 (centering portion 10).

As shown in the figure, this eccentric bushing 20 is mounted so as to be movable in the direction of the axis O of the crankshaft 1, and has a arm 23 on its circumferential surface. 8 is an oil supply pipe, and 28 is an oil groove. There is no need for an O-ring or the like in the conventional structure.

On the other hand, the connecting rod 30 has an eccentric bush moving means 40 built therein. Note that, as shown in FIG. 2, two sets of the moving means 40 are provided symmetrically, but in FIG. 1, one set is shown in a different position above the connecting rod 30 for convenience in explaining the structure. did.

Here, the present moving means 40 is means for selectively moving the eccentric bushing 20 to the left or to the right in FIG. The cylinder chamber 41 is placed horizontally on the connecting rod 30.
is provided, and the piston 42 is fitted. Pin 4 to piston 42
3 and engage the end of the pin 43 with the above-mentioned clear 23. Therefore, when oil pressure is applied to the oil port 45, the piston 4
2 can be moved and held in the position shown in FIG. 1, and when hydraulic pressure is applied to the oil port 46, it can be moved to the right in FIG. 1 and held in that position. Note that 47 is a sealing member.

Here, the piston 42 is provided with a stepped through hole 42a, and the pin 43 is inserted into the through hole 42a from the opening 30a.
can be inserted. Further, unless the piston 42 is moved left and right, the eccentric bushing 20 will not be moved left and right by the pin 43.

Next, the effect will be explained.

(Preparation for stroke adjustment) The eccentric bushing 20 is separated from the crankshaft 1 by the moving means 40 and connected to the connecting rod 30.

That is, in the state shown in FIG. 1, when hydraulic pressure is supplied from the oil port 46 to the cylinder chamber 41, the eccentric bushing 20 moves in the direction of the axis O of the crankshaft 1 (to the right in FIG. 1). Therefore, the internal gear 21 and the external gear 11 that have been meshed up to now are disengaged, and instead, the external gear 25 of the eccentric bushing 20 meshes with the internal gear 35 on the connecting rod 30 side. Here, the eccentric bushing 20 can be fixed to the connecting rod 30, which is a stationary body at this stage.

In addition, during this preparation, the posture of the eccentric bushing 20 can be changed by selecting the stopping angle of the crankshaft 1.
It is preferable to maintain a desired posture (rotation angle).

(Stroke adjustment) When the crankshaft 1 is rotated by a predetermined angle, the outer circumferential surface of the scarred portion 10 and the inner circumferential surface of the eccentric bushing 20 become sliding surfaces B, and the eccentric portion 10 is connected to the eccentric bushing fixed to the connecting rod 30. It can rotate relative to 20. That is, since the relative position of the damaged center part 10 and the eccentric bushing 20 can be changed, as described above using FIG.
It is possible to change the actual eccentricity E, that is, the stroke length.

(Press Operation) After stroke adjustment, the defective bushing moving means 40 is operated again, and this time the eccentric bushing 20 is connected to the crankshaft 1 side.

That is, when hydraulic pressure is supplied into the cylinder chamber 41 from the oil port 45, the piston 42 (pin 43) is in the position shown in FIG. That is, the external gear 25 and the internal gear 35 are disengaged, and the internal gear 21 on the eccentric bushing 20 side meshes with the external gear 11 on the crankshaft 1 side. The eccentric bushing 20 and the eccentric portion 10 are integrally connected while maintaining their relative positions after 78M.

After that, when the crankshaft 1 is rotated, the connecting rod 30 can be stroked through the sliding surface C since the faith bushing 20 and the damaged part 10 are integrated.

Therefore, the press can be operated smoothly with the adjusted stroke length.

According to this embodiment, the eccentric bushing 20 is mounted so as to be movable in the direction of the axis O of the crankshaft 1, and the meshing of the gears 25, 35, 11, 21 is switched to move the eccentric bushing 20 toward the connecting rod 30. Alternatively, since the broken bush moving means 40 selectively connected to the crankshaft 1 (10) side is provided 9 and this means 40 is internally housed within the connecting rod 30, the external mounting mechanism etc. of the conventional device can be eliminated. While making the press smaller and expanding the effective space inside the crown,
By simply applying hydraulic pressure to the cylinder chamber 41, the stroke length can be quickly and easily adjusted in multiple stages.

In addition, since the connection of the eccentric bushing 20 to the crankshaft 1 (eccentric part 10) side or the connecting rod 30 side is performed by meshing the gears 11, 21, 25, 35, the stroke length adjustment step can be made very thin. It can be multi-stage. Moreover, since gear meshing is changed by moving the eccentric bushing 20 in the axial direction, the sliding surfaces B and C between the crankshaft 1 (10), the eccentric bushing 20, and the connecting rod 30 are free from oil leakage, which would normally occur in the case of a sideway. There is no need to install a preventive O-ring, etc., and the structure is simple and stable operation can be guaranteed.

Furthermore, since it is only necessary to switch the oil pressure to the oil ports 45 and 46, it is easy to automate the stroke length adjustment work and its preparation work.

[Effects of the Invention] According to the present invention, there is provided an eccentric bushing moving means for mounting an eccentric bushing movably in the axial direction of the crankshaft and selectively moving the eccentric bushing to the connecting rod side or the crankshaft side. Because this means is installed inside the connecting rod, the external installation space for the conventional slide stroke length adjustment device can be eliminated, making the Press II machine more compact and increasing the internal effective space. Multi-step stroke adjustments can be made quickly and easily.

0...Eccentric bush moving means, 1... cylinder chamber, 2...Piston, 3...Bin.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is a diagram for explaining a crank-driven press machine, and Fig. 4 is a slide using an eccentric bushing. It is a figure for explaining a stroke length adjustment device. DESCRIPTION OF SYMBOLS 1... Crankshaft, 10... Eccentric part, 11... External gear, 20... Eccentric bushing, 21... Internal gear, 23... Groove, 25... External gear , 30... Connecting rod, 35... Internal gear,

Claims (1)

[Claims] (1) In a slide stroke length adjustment device for a press machine configured to adjust the slide stroke by changing the relative position of an eccentric bushing interposed in a connecting portion between an eccentric portion of a crankshaft and a connecting rod, The eccentric bushing is mounted so as to be movable in the axial direction of the crankshaft, and the eccentric bushing is provided with an internal gear and an external gear, and the connecting rod is provided with an external gear with the internal gear provided on the crankshaft side. A press characterized in that an eccentric bush moving means for selectively moving the eccentric bush so as to mesh with a toothed gear or to bring the external gear into mesh with an internal gear provided on the connecting rod side is installed. Machine slide stroke length adjustment device.