JPH0737615U - Lock mechanism in rod type guide device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a locking mechanism for a rod type guide device having a novel structure that can be securely locked with a strong force at any position on the rod, is compact and has a small number of parts. A drum-shaped friction pipe having multiple spiral slits on its body is fixed to the inner surface of the insertion hole of the mounting member by one end thereof being fixed to the other end of the friction pipe. Drive means for applying a rotational force in the direction of narrowing the circular slit is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lock mechanism for a rod-type guide device, which is compact, has a small number of parts, and can obtain a large locking force at any position.

[0002]

[Prior art]

 Conventionally, a through hole is provided in a predetermined mounting member such as a movable plate in a mold clamping device of an injection molding machine or a movable plate in a press machine, and a sliding bearing and a direct-acting type ball bearing ring are provided inside. A rod-type guide device is known in which a mounting member is movable with respect to the rod or a rod is movable with respect to the mounting member by inserting the rod into the slide bearing or the direct-acting type ball bearing and assembling the rod bearing. ing.

Incidentally, this rod-type guide device is often incorporated with a lock mechanism that locks the relative movement of the rod with the rod-type guide device.

There is a method of locking the mounting member and the rod by using a pin or the like as such a locking mechanism, but this method locks only at the position where a groove for engaging the pin on the rod side is machined. However, it is impossible to lock at any position, and the locking operation is troublesome.

Further, a multi-threaded annular groove is engraved in the circumferential direction of the outer peripheral surface of the rod, and a half nut having a screw thread on the inner surface which meshes with the multi-threaded annular groove is incorporated on the mounting member side. There is a method of engaging and locking the multi-threaded annular groove of the rod with this nut. However, if the multi-threaded annular groove is machined on the entire rod, it cannot pass through the sliding bearing or the linear motion type ball bearing. It is not possible to lock it in any position, because it is limited to the location of. In addition, the mechanism that engages the split nut becomes complicated.

[0006]

[Problems to be solved by the device]

 Here, the present invention has been made in view of the above situation, and it is possible to securely lock the rod at any position on the rod with a strong force, and it is compact and has a new structure with a small number of parts. The object is to provide a lock mechanism in a type guide device.

The inventor of the present invention has previously disclosed a lock mechanism in a rod type guide device as shown in FIG. A spiral slit 24 extending in the axial direction is provided on the inner peripheral surface of the insertion hole 4 in the mounting member 3, and an inner diameter larger than the outer diameter of the guide rod 14 and the insertion hole 4 formed in the mounting member. A cylindrical coil spring 26 having an outer diameter larger than the inner diameter is inserted into the spiral slit 24 provided in the mounting member 3 and mounted, and the guide rod 14 is inserted into the inner hole of the coil spring 26. The coil ends of the coil spring 26 are supported by mounting members, and a coiling force is applied to one of the coil ends in the winding direction of the coil spring 26. Then, the guide rod 14 can be pressed and fixed to the outer diameter surface of the rod 14.

The locking mechanism in such a rod type guiding device uses a coil spring made of a single piece of material, and obtains a locking force by exerting a narrowing force in the winding direction on the end of the coil spring. Due to the structure, the size of the narrowing force is largely determined by the cross-sectional area of the coil wire, and a coil having a large wire cross-sectional area is required to obtain a large locking force, and further miniaturization is required to achieve miniaturization. There was a limit.

[0009]

[Means for Solving the Problems]

 The present invention is an improved locking mechanism against the background of the above problems, and the magnitude of the locking force depends on the cross-sectional area of one strand of wire. The structure was replaced with a friction pipe to reduce the size.

[0010]

A drum-shaped friction pipe having a plurality of spiral slits is fixed to the inner surface of the insertion hole of the mounting member by statically fixing one end to the other end of the friction pipe. A driving means for applying a rotational force in the direction of narrowing the spiral slit is provided, and the structure is such that it can be press-contacted and fixed to the outer peripheral surface of the rod. Since it has a multi-row spiral slit, it is equivalent to using multiple coil springs.

[0011]

【Example】

 FIG. 1 is an example for explaining the present invention. An insertion hole 4 is formed in the mounting member 3 of the rod-type guide device 1, one end 5 of the hourglass-shaped friction pipe 2 is fixed in the insertion hole 4 in a static manner, and the other end of the friction pipe 2 is fixed. Gear teeth 7 a are engraved on the outer circumference of the gear 6. The ring gear 9 having teeth 7b meshing with the teeth 7a of the gear on the inner surface and having teeth 8a of the gear engraved on the outer circumference is a tooth having the teeth 7b of the inner surface engraved on the other end 6 of the friction pipe 2. It is rotatably incorporated into the mounting member 3 via the rotary type bearing 10 while being meshed with 7a.

Here, the hourglass-shaped friction pipe 2 shown in FIG. 2 will be described. One end 5 forms a flange, and its outer diameter is fitted into the mounting member 3 and fixed. The other end 6 constitutes a gear and is provided with teeth 7a. The body has a multi-row spiral slit 11, and the spiral slit 11 penetrates to an inner diameter 12. When the one end 5 is fixed and the other end 6 is turned in the direction of narrowing the spiral slit 11, the inner diameter 12 is slightly contracted.

Next, returning to FIG. 1, description will be made. Slide bearings 13, 13 are inserted and fixed to the inner surface of the hourglass-shaped friction pipe 2. The sliding bearings 13, 13 are guided by the outer circumference of a rod 14 which is inserted and incorporated, and are slidable in the axial direction, and also receive the load applied to the rod type guide device 1. The inner diameter 12 of the friction pipe 2 is slightly larger than the outer diameter of the rod 14, and normally does not contact the rod 14.

A hydraulically driven oscillating motor 15 is attached to one end of the mounting member 3, and a gear 17 is fitted into the drive shaft 16, and teeth 8b formed on the outer periphery of the gear 17 mesh with teeth 8a on the outer periphery of the ring gear 9. is doing.

Next, the operation will be described. When pressure oil is sent to the oscillating motor 15 and a rotational torque is given to the drive shaft 16, the torque is transmitted to the gear 17 and the ring gear 9, and the end 6 of the friction pipe 2 is turned in the direction of narrowing the spiral slit 11. It will be. Since the end portion 5 side of the friction pipe 2 is fixed, the body portion is twisted so that the inner diameter 12 thereof is slightly contracted, and if it is contracted from the outer diameter of the rod 14, it can be fixed and locked.

When pressure oil is fed to the swing motor 15 and the rod type guide device 1 is locked, the length of the friction pipe 2 is slightly shortened because the friction pipe 2 is twisted. This slight change in length is absorbed by the meshing of the teeth 7a of the end portion 6 and the teeth 7b of the ring gear 9. Moreover, the effect of locking differs depending on the direction of the load applied to the rod-type guide device 1. If the force applied to the mounting member 3 is in the direction F in FIG. 1, a stronger locking force is exerted. That is, at this time, the tensile load acts on the friction pipe 2 to expand it, and the inner diameter 12 tends to shrink, so that a larger locking force than the locking force due to the torque of the applied twist is obtained. .

The lock mechanism in the rod guide device has been described above by way of example, but the method of twisting the friction pipe 2 is not limited to this example. FIG. 3 is an example of a locking mechanism of a rod-type guide device that moves across two rods. Two friction pipes 2a and 2b each having a spiral slit 11 whose twisting directions are different from each other are used. The levers 18a and 18b are fixed to the end 6 side of each friction pipe 2, and the tip ends are connected by a hydraulic cylinder 19. By sending pressure oil to the hydraulic cylinder 19 to extend it and apply a rotational force in the direction of narrowing down the spiral slits of the friction pipes, the two rods can be locked at the same time.

FIG. 5 shows an example in which a rod type guide device with a lock mechanism is incorporated and used in a mold clamping mechanism of an injection molding machine. In this case, the mold clamping cylinder 51 serves as the mounting member 3. A frame 59 and a fixed plate 55 are erected on the base 58, and the four rods 14 are mounted between the frame 59 and the fixed plate 55 in parallel with each other. The mold clamping cylinder 51 having the movable platen 53 on which the movable mold 56 is mounted and the rod type guide device 1 having a lock mechanism is incorporated in the mold clamping cylinder 51. It is supported so as to be able to approach and separate from the fixed plate 55 by being inserted into. The ram 52 fitted to the mold clamping cylinder 51 and the movable platen 53 are integrally fixed by bolts.

The operation will be described below. The mold closing operation is performed by pulling the movable platen 53 by the high-speed mold opening / closing cylinder 62, and switching to the low speed immediately before the molds 56 and 57 are closed, and the operation of the rod type guide device 1 is performed. Stop. At the same time, when pressure oil for increasing pressure is sent to the mold clamping cylinder 51, the ram 52 projects from the mold clamping cylinder and the movable mold 56 and the fixed mold 57 are closed. At the time of mold opening operation, pressure oil is sent to the oil chamber 61 of the mold clamping cylinder 51 to retract the ram 52 to strongly open the molds 56 and 57, and then the rod type guide device 1 is unlocked, and the high speed mold is released. The mold clamping cylinder 51 and the movable mold 56 are both opened at high speed from the opening / closing cylinder 62.

In this device, since the mold clamping cylinder moves to the mold clamping position and can be locked to the rod 14 at that position, it is not necessary to use the mold clamping cylinder having a long stroke. For this reason, a small cylinder can be used, so the machine can be downsized, which in turn reduces the amount of hydraulic oil, downsizes the oil tank, does not use expensive prefill valves, and uses less pressure oil to boost the cylinder, thus saving energy. There are great advantages such as achievement.

[Effect of device]

 According to the present invention, since the spiral slit 11 has multiple threads, it has the same effect as using a plurality of coil springs in combination, and it is possible to increase the rotational force applied in the narrowing direction of the spiral slit. It can be used as a lock mechanism in a rod type internal device having a large locking force for its shape.

[Brief description of drawings]

FIG. 1 shows an example of a lock mechanism in a rod guide device according to the present invention.

[Fig. 2] Detailed view of the drum-shaped friction pipe

FIG. 3 shows an example in which a hydraulic cylinder is used as a driving means.

FIG. 4 is a rod-type guide device previously disclosed by the present inventor.

FIG. 5: Example of incorporation into a mold clamping mechanism of an injection molding machine

[Explanation of symbols]

 1 Rod Type Guide Device 2 Friction Pipe 3 Mounting Member 4 Insertion Hole 9 Ring Gear 10 Bearing 11 Spiral Slit 13 Sliding Bearing 14 Rod 15 Swing Motor 17 Gear 18a, 18b Lever 19 Hydraulic Cylinder 24 Spiral Groove 26 Coil Spring 51 Clamping Cylinder 52 Ram 53 Movable plate 55 Fixed plate 56 Movable die 58 Base 62 Cylinder

Claims (2)

[Scope of utility model registration request] 1. A rod formed by providing an insertion hole in a predetermined mounting member and inserting the rod into the insertion hole, thereby assembling the mounting member and the rod so as to be relatively displaceable in the axial direction of the rod. In the guide device, the lock mechanism locks the attachment member and the rod in a relatively non-displaceable manner, and has a drum having a multi-row spiral slit in the body portion on the inner surface of the insertion hole of the attachment member. -Shaped friction pipe is fixed by statically fixing one end, and the other end of the friction pipe is provided with a driving means for applying a rotational force to the spiral slit in the direction of narrowing down, so that the friction pipe can be fixed to the outer peripheral surface of the rod by pressure contact. A lock mechanism in a rod type guide device characterized by the above. 2. A mold clamping device for an injection molding machine, wherein the rod type guide device having the lock mechanism according to claim 1 is used as a rod type guide device.