JPH08118095A - Adjusting mechanism for bottom dead center of press - Google Patents

Abstract

PURPOSE: To easily and quickly make a fine adjustment in the position of the bottom dead center of a ram during the running of a press by rotating the fulcrum shaft of an adjusting screw supporting a steering bell crank by plural combined gears. CONSTITUTION: When driving a motor 15 during the running of a press, a gear 20 fixed on the rotating shaft of this motor 15 is rotated, and a gear 23 is rotated through gears 21 and 22. Thus, a rotating shaft 17 is rotated, a worm 18 formed on this rotating shaft 17 is rotated, a worm wheel 16 engaging with this worm 18 is rotated, and a fulcrum shaft 11 fixed on the worm wheel 16 is rotated. This fulcrum shaft 11 is made an eccentric shaft. For a steering bell crank 6 supported by this eccentric shaft, its fulcrum position is changed by eccentricity, and the position of the bottom dead center of a ram can be changed or adjusted. Consequently, while continuing the running of a press, a very fine change or adjustment of the bottom dead center can be easily performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom dead center adjusting mechanism for a press machine.

[0002]

2. Description of the Related Art A press machine equipped with a Robert link mechanism for converting a rotary motion of a crankshaft into a linear motion to obtain a linear motion in a vertical direction of a ram is well known. Will be briefly described with reference to the front view of FIG. 4. A connector 3 connected to a crankshaft 2 pivotally supported by a frame 1 is connected to a Robert link 4, and the Robert link 4 is a plan view schematic via a link 5. It is connected to one corner of the triangular bell crank 6. The plunger 8 fixed to the ram 7 is connected to one of the other two corners of the bell crank 6 via a link 9, and is connected to the balancer 12 at the other corner of the bell crank 6. The bell crank 6 is supported by the fulcrum shaft 11 of the adjusting screw 10, and the adjusting screw 10 has a threaded portion in the frame 1.
Is rotatably mounted on and is screwed into a nut 14 which is rotated by a worm 13.

When operating this press machine, first, the worm 13 is rotated to rotate the nut 14, and the nut 1 is rotated.
The adjusting screw 10 screwed to the screw 4 is moved upward or downward to adjust the position of the fulcrum shaft 11, thereby adjusting the bottom dead center position of the ram 7. When the crankshaft 2 is rotated by a drive source such as a motor after this adjustment, the rotational movement is
The connector 3 connected to the crankshaft 2 and the Robert link 4 convert the linear motion to the left and right, and the linear motion is transmitted to the bell crank 6 via the link 5, and the bell crank 6 swings about the fulcrum shaft 11. Move. The swing is connected to the bell crank 6 and transmitted to the plunger 8 and the ram 7, and the ram 7 makes a linear motion in the up-and-down direction to process the workpiece at the bottom dead center position of the ram 7.

[0004]

The adjustment of the bottom dead center position of such a conventional press machine basically corresponds to the shape accuracy of the product to be processed. It is locked to avoid fluctuations in the dead center position, making it difficult to change or adjust the bottom dead center position while the press machine continues to operate.

The present invention has been made in view of the above-mentioned difficulties, and it is possible to change the bottom dead center position while continuing the operation of the press machine or to adjust the minute fluctuation of the bottom dead center position during the operation of the press machine. The purpose is to make it easy.

[0006]

The object of the present invention is to provide a mechanism for adjusting the bottom dead center of a ram of a press, a frame, a crankshaft pivotally supported by the frame, and a connector connected to the crankshaft. A ram, a plunger fixed to the ram, a nut rotatably attached to the frame, and an eccentric shaft screwed to the nut and having a worm wheel fixed to an end thereof are rotatably attached. An adjusting screw, a bell crank rotatably supported by an eccentric shaft of the adjusting screw, which is connected to the connector and the plunger, and a rotatably supported eccentric shaft, and a first gear fixed to an end thereof, A rotary shaft that forms a worm that engages with the worm wheel, a rotary drive shaft that has a second gear fixedly attached to its end, and a compound wheel that is connected to each other by a link between the first gear and the second gear. It is accomplished by constructing and a gear.

[0007]

When adjusting the position of the bottom dead center of the ram 7 of this press machine, the nut is rotated and the adjusting screw screwed to the nut is linearly moved upward or downward to form the swing fulcrum of the bell crank. The position of the eccentric shaft is adjusted so that the bottom dead center position of the ram is adjusted. At this time, the rotating shaft 17 supported by the eccentric shaft also moves upward or downward in conjunction with the movement of the eccentric shaft. The movement of the rotating shaft is performed by the action of the links of the plurality of gear mechanisms that are connected to each other by the link between the first gear and the second gear, without rotating any of the gears, and between the gears. Of the second gear, which is always fixed to the rotary drive shaft, is transmitted to the rotary shaft forming the worm.

Then, when it is necessary to adjust or change the bottom dead center position of the ram during the operation of the press machine (though not limited to during the operation), the rotary drive shaft is driven,
The rotation rotates the first gear through the plurality of gears, which causes the rotation shaft to rotate, the worm formed on the rotation shaft to rotate, and the worm wheel engaged with the worm to rotate. Then, the eccentric shaft fixed to this worm wheel rotates. The fulcrum position of the bell crank supported by the eccentric shaft is changed by the eccentricity, whereby the position or bottom dead center of the ram can be changed or adjusted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same portions are denoted by the same reference numerals throughout the drawings. 1 is a longitudinal sectional view of a press machine according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view of the press machine shown in FIG. 1. In FIGS. 1 and 2, reference numeral 1 is a frame, and FIG.
A nut 14 (FIG. 2) which is rotated by a worm 13 (see FIG. 4) is rotatably attached to the bell crank 6 having a substantially triangular shape in a plan view, as shown in FIG.
A fulcrum shaft 11 that supports (see also FIG. 4) is rotatably attached to an adjusting screw 10. The fulcrum shaft 11 is an eccentric shaft, and a worm wheel 16 is fixed to one end of the fulcrum shaft 11. Teeth of the worm wheel 16 engage with a spiral groove of a worm 18 formed on the rotary shaft 17.

The rotary shaft 17 is rotatably attached to the fulcrum shaft 11, is rotatably attached to and supported by a stay 19 provided between the fulcrum shafts 11, and a gear 23 is fixed to one end thereof. . This gear 23 meshes with the gear 22 and
2 meshes with the gear 21, the gear 21 meshes with the gear 20 fixed to the rotary shaft of the motor 15 attached to the outside of the frame 1, the gear 23 and the gear 22 link 25, and the gear 22 and the gear 21 The links 24 are connected to each other (hereinafter, the mechanism from the gear 23 to the gear 20 is referred to as a "positional displacement following mechanism"). The position displacement follow-up mechanism is covered with a cover 26 attached to the frame 1 so that oil or the like is not transmitted to the motor 15, and the gear 21 is rotatably attached to this cover.

In FIG. 1, 9 is a link connected to the plunger 8 fixed to the ram 7, 12 is a balancer, 4 in FIG. 2 is a Robert link, and 5 is a Robert link. And the mechanism including the crankshaft is similar to that shown in FIG.

When adjusting the bottom dead center position of the ram 7 of this press machine, first, the worm 13 (see FIG. 4) is rotated to rotate the nut 14, and then the adjusting screw screwed into the nut 14 is rotated. 2 is linearly moved upward or downward on the paper surface of FIG. 2 to adjust the position of the fulcrum shaft 11, thereby adjusting the bottom dead center position of the ram 7. At this time, the fulcrum shaft 11 linearly moves upward or downward, and the worm wheel 16, the stay 19 supported by the fulcrum shaft 11, and the rotary shaft 17 supported by the stay 19 also interlock with the movement of the fulcrum shaft 11. And move up or down.

When the rotary shaft 17 is moved upward or downward, the gear 23 fixed to one end of the rotary shaft 17 is also linearly moved upward or downward. FIG. 3 is a front view of the position displacement follow-up mechanism. The upward or downward linear movement of the gear 23 corresponds to the left or right linear movement of the gear 23 on the paper surface of FIG. When linearly moved to the left, the link 24 connected to the gear 21 swings to the left around the center of the gear 21 as a fulcrum, and the gear 22 connected to the link 24 and the link 25 connected to the gear 23. Also moves to the left. This movement is performed by the action of the link 24 and the link 25 without rotating any of the gears 20 to 23,
Further, the meshing between the gears is also performed without being disengaged.

When it is necessary to adjust or change the bottom dead center position of the ram 7 during operation of the press machine (not limited to during operation), the motor 15 is driven while continuing the operation. The gear 20 fixed to the rotary shaft of 15 rotates, and the rotation thereof rotates the gear 23 via the gear 21 and the gear 22, thereby rotating the rotary shaft 17 and forming the rotary shaft 17. The worm 18 rotating rotates, the worm wheel 16 meshing with the worm 18 rotates, and the fulcrum shaft fixed to the worm wheel 16 rotates. The fulcrum shaft 11 is an eccentric shaft, and the bell crank 6 supported by the eccentric shaft is
The fulcrum position is changed by eccentricity, so that the bottom dead center position of the ram 7 can be changed or adjusted.

The change or adjustment of the bottom dead center position of the ram 7 due to this eccentricity is performed after the bottom dead center position of the ram 7 is set in advance by the adjusting screw 10, and a large amount of positional displacement is required. Therefore, it is sufficient to slightly decenter the fulcrum shaft 11. In other words, a combination of a slight eccentricity of the fulcrum shaft 11 and a gear ratio for rotationally driving this shaft makes it possible to change or adjust an extremely minute position, and the adjusting screw 10
Is separated from the adjustment of the bottom dead center position of the ram 7,
The change or adjustment is easy and can be performed quickly.

It should be noted that minute fluctuations in the bottom dead center position of the ram 7 during the operation of the press machine are detected by an optical detector or the like, and the drive of the motor 15 is controlled by the detection, and
A slight change in the bottom dead center position may be adjusted, or may be manually performed by another driving means such as a handle instead of the motor.

[0017]

As described above, according to the present invention, it is possible to easily change the bottom dead center position while continuing the operation of the press machine and to adjust the minute fluctuation of the bottom dead center position during the operation of the press machine. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a press machine according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the press machine according to the embodiment of FIG.

FIG. 3 is a front view of a position displacement tracking mechanism used in the press machine according to the embodiment of FIG.

FIG. 4 is a front view of the press machine.

[Explanation of symbols]

 1 Frame 2 Crank Shaft 3 Connector 4 Robert Link 6 Bell Crank 7 Ram 8 Plunger 10 Adjusting Screw 11 Support Point Shaft 13, 18 Worm 14 Nut 15 Motor 16 Worm Wheel 17 Rotating Shaft 19 Stay 20, 21, 22, 23 23 Gear 24, 25 Link

Claims (1)

[Claims] 1. A frame, a crankshaft pivotally supported by the frame, a connector connected to the crankshaft, a ram and a plunger fixed to the ram, and rotatably attached to the frame. A nut, an adjustment screw screwed to the nut, and an eccentric shaft having a worm wheel fixed to an end thereof rotatably attached, and an eccentric shaft of the adjustment screw rotatably supported by the connector and the connector. A bell crank connected to the plunger, a rotation shaft rotatably supported by the eccentric shaft, a first gear fixed to an end thereof, and a worm formed to engage with the worm wheel, and a second gear connected to the end. A bottom dead center adjusting mechanism of a press machine, comprising: a rotary drive shaft to which is fixed, and a plurality of gears connected to each other by a link between the first gear and the second gear.