JPH0428717Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a crank press machine in which a connection ball is provided on a connection rod connected to a crankshaft, and a plunger is connected via the ball.

(Prior Art) Conventionally, a device described in Japanese Patent Publication No. 56-1999 has been known as this type of device. The device is
A step gear consisting of a worm wheel and a pinion is pivotally supported on the barrel of the slider into which the adjustment screw part is screwed, and the pinion is meshed with a long external gear provided at the top of the adjustment screw part. The external gear is rotated by a pinion via a worm mechanism to operate an adjustment screw, and the external gear can be moved relative to the pinion in the axial direction.

However, this device requires a pinion and an external gear in addition to the worm mechanism, and also requires a mechanism for pivotally supporting the step gear on the barrel, so it has the disadvantage of being structurally complex and expensive.

In addition, the one in which the adjusting screw for adjusting the shaft height is directly driven by a worm wheel is disclosed in Japanese Patent Application Laid-Open No. 53-
This is known from Publication No. 19167, Publication of Utility Model Publication No. 55-19677, etc., but in the former, the adjusted side of the adjusting screw is a male thread and the worm wheel is located below the adjusting screw, so that play is removed from the adjusting screw. In the latter case, the worm and worm foil are installed inside the slide and serve as components of the play removal mechanism, which makes the slide large and heavy, and the inertia of the reciprocating mass increases. Since the is large, vibration is likely to occur.

Furthermore, in the press machine disclosed in JP-A-54-163480, a connecting rod and a screw sleeve are connected with a pin, and a guide key is fixed to the outer periphery of the upper end of the screw sleeve. If this is applied to a device that connects a connecting rod and a screw sleeve with a ball, it is necessary to further provide a ball cap mounting portion at the upper end of the screw sleeve, resulting in the disadvantage that the structure of the upper end becomes complicated. Further, since an oil chamber for overload detection is provided at the lower end of the female screw following the screw sleeve, it is difficult to provide a screw locking mechanism in this device as well.

(Problems to be solved by the invention) As described above, in the conventional technology, the drive transmission mechanism for the screw sleeve and the mounting part of the guide member are complicated, and it is difficult to provide a screw locking mechanism. There is a problem, and the present invention attempts to solve this problem.

(Means for Solving the Problems) The means for solving the problems in the present invention is to attach a plunger connected to a connection rod pivotally supported by a crankshaft via a connection ball at the tip of the rod to a frame. In a crank press machine in which a ram is attached to the plunger, a screw sleeve is screwed into the plunger, and a ball cap for holding the connection ball is fixed to the screw sleeve. A ring worm surrounding the ball cap and interlocking with the worm is disposed in the case, and a guide member protruding from the outer periphery of the ball cap is moved vertically into a groove formed vertically on the inner circumferential surface of the ring worm. A cylinder is provided at the lower end of the plunger and has an oil supply passage for locking.
It is characterized in that the piston that fits into the cylinder is provided with a rod that hermetically passes through the cylinder and is screwed into the tip of the screw sleeve.

(Function) Since the above-mentioned means is provided, by fixing the ball cap to the screw sleeve, the connection rod and the screw sleeve are connected, and the guide member is connected to the screw sleeve. Guides the vertical movement of the You Sleeve and prevents rotation. Further, the rotational force transmitted from the worm to the ring worm is transmitted to the screw sleeve via the guide member, and the height of the ram is adjusted by rotating the screw sleeve. In addition, by supplying hydraulic pressure to the cylinder provided on the plunger that the screw sleeve is screwed into, the piston that is fitted into the cylinder and connected to the screw sleeve is pulled, and the gap between the screw sleeve and the plunger is closed. removed. To explain this with respect to the illustrated embodiment, reference numeral 1 indicates a frame, and a ram 3 provided opposite to a bed 2 of the frame 1 is guided by a guide 4 provided on the frame 1 and is slidably attached to the frame 1. The plunger 5 is fixed to a supported plunger 5, and the plunger 5 is connected to a connection rod 7 supported by a crankshaft 6 via a connection ball 8 at its tip. A plunger 5 that fixes the ram 3 in order to adjust the height H of the ram 3 with respect to the bed 2 by h has the following features:
As shown in FIG. 2, the screw sleeve 9 is fitted and the spiral portion 10 on its outer periphery is screwed onto the plunger 5, and the connection ball 8 is fixed via the ball cap 11 fixed to the tip thereof. ing. A guide member 12 consisting of a pair of rollers protruding in the diametrical direction is attached to the outer periphery of the ball cap 11.
is fitted into an axial groove 15 provided on the inner peripheral surface of a ring worm gear 14 provided on the frame 1 so as to rotate in conjunction with the worm 13. Further, in the drawing, reference numeral 16 indicates a locking device for the screw sleeve 9, and this device 16 screws the rod 19 of the piston 18, which is inserted into the hydraulic cylinder 17 formed on the plunger 5 to be operated by hydraulic pressure, onto the screw sleeve 9. By crimping and locking the spiral portion 10 of the screw sleeve 9 with the piston 18 pressurized by the oil pressure in the cylinder 17, the looseness of the spiral portion 10 is eliminated, and the occurrence of rattling and vibration during operation. prevent. In this locking device 16, if the threads of the rod 19 are made to have the same pitch as the spiral portion 10, the volume inside the cylinder will not change even after the ram height is adjusted, and the amount of oil pressure adjustment can be reduced. In the figure, 20 indicates an oil supply path for the hydraulic cylinder 17, and 21 indicates a plunger guide.

Next, to explain its operation, when adjusting the height of the ram 3, the hydraulic pressure of the hydraulic cylinder 17 is lowered to unlock the locking device 16.
is released, and then when the worm 13 is driven to rotate the ring worm gear 14, the ball cap 11 and the cap 1 are
The screw sleeve 9 that fixes the screw sleeve 9 also rotates, and the plunger 5 that is screwed into the sleeve 9 through the helical part 10 rotates up and down because the ram 3 that is fixed thereto is supported by the guide 4 so that it cannot rotate. The height of the ram 3 is adjusted by sliding it. Rotation of the crankshaft 6 causes the plunger 5 to move up and down, and a guide member 12 provided on a ball cap 11 integral with the plunger 5 moves up and down within the groove 15. Note that the structure of the portion of the ball cap 11 that engages with the groove 15 may be a protrusion instead of a roller.

(Effects of the invention) According to the invention, the screw sleeve 9 is screwed into the plunger 5, and the ball cap 11 holding the connection ball 8 is fixed to the screw sleeve 9.
Since the guide member 12 protruding from the ring worm 14 is engaged with the groove 15 of the ring worm 14 which is interlocked with the worm 13, the number of parts is small and the structure is simple. By the rotation of 9, the plunger 5 to which the ram 3 is attached is moved up and down to adjust the height of the ram.
Since the adjustment is made using the mounting part of the connection ball 8 as a reference without moving the part,
It has the effect of being performed accurately and at each end.
The guide member 12, which cooperates with the ring holder 14 for adjusting the rotation of the screw sleeve and the groove 15 on its inner periphery, can be provided above the plunger guide 21 and the plunger 5. The lock device 16 can be easily provided at the lower end of the sleeve 9, simplifying the overall structure, and the worm and the weight of the worm are removed from the plunger 5, which has the effect of preventing vibration of the ram 3. It is.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a schematic diagram and FIG. 2 being a longitudinal sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Frame, 3... Ram, 5... Plunger, 6... Crankshaft, 7... Connection rod, 8... Connection ball, 9... Screw sleeve, 11... Ball cap, 12 ……
Guide member, 13...Worm, 14...Ring worm, 16...Lock device, 17...Cylinder, 18...Piston.

Claims (1)

[Scope of utility model registration request] A plunger 5 connected to a connection rod 7 supported by a crankshaft 6 through a connection ball 8 at the tip of the rod 7 is slidably supported on the frame 1, and a ram 3 is attached to the plunger 5. In the crank press machine, the screw sleeve 9 is screwed into the plunger 5, and the ball cap 11 holds the connection ball 8 on the screw sleeve 9.
A ring worm 14 that surrounds the ball cap 11 and interlocks with the worm 13 is attached to the case 1.
A guide member 12 protruding from the outer periphery of the ball cap 11 is vertically movably engaged in a groove 15 provided vertically on the inner peripheral surface of the ring worm 14, and is locked to the lower end of the plunger 5. Oil supply path 2 for
0 is provided, the cylinder 12
A ram height adjusting device for a crank press machine, characterized in that a piston 18 fitted into the cylinder 17 is provided with a rod 19 which hermetically passes through the cylinder 17 and is threadedly engaged with the tip of the screw sleeve 9.