JPH0421612Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention can be used to fix a press mold to the slide or bolster of a press machine, or to fix other articles on a predetermined table. The present invention relates to a clamp device push/pull drive device that moves a hydraulic clamp device along a T-slot.

<Prior Art> Conventionally, as this type of push/pull drive device for a clamp device, there is a device as seen in, for example, Japanese Utility Model Application No. 59-185029. The general structure is a flexible strip (roller) that is inserted into the T-groove and guided by the T-groove and can be pushed and pulled in order to move the clamp device having the T-groove engagement part along the T-groove. One end of the flexible strip (with attached chain) is connected to a clamping device, and the part protruding from the T-groove end of the flexible strip is engaged with a drive wheel (sprocket). By rotating the clamp device, the flexible strip is driven forward and backward, thereby moving the clamping device forward and backward.

In addition, as a push/pull drive device for this type of clamp device, as shown schematically in FIG. Flexible strip 4
There is one in which the air cylinder 5 is used to directly push and pull the air cylinder 5 through the air cylinder 5. In addition, 6 in the figure is a piston rod, and 7 is a guide corresponding to a T groove.

<Problems to be solved by the invention> As mentioned above, there are drive devices that use electricity or fluid pressure to push and pull the clamp device along the T-groove, but it is up to the user to decide which one to use. It depends on the usage environment and preference. Therefore, both are necessary. Conventional hydraulic drive systems generally use air cylinders, and although the above-mentioned air cylinders that directly push and pull the flexible strips can be manufactured at low cost, they require a fairly large and elongated space. There is a problem of bulk.

This invention attempts to provide a relatively compact clamp device push/pull drive device using a fluid pressure cylinder as a drive source.

<Means for Solving the Problems> The means of this invention includes a clamp device movable along the T-groove, and one end of which is inserted into the T-groove from the T-groove end and coupled to the clamp device. A flexible strip whose end is located outside the T-slot is engaged with a portion of the flexible strip protruding from the T-slot end, and rotation causes the flexible strip to move longitudinally. A clamp device push-pull drive device comprising a strip drive wheel provided to move the clamp device along the T-groove by pushing and pulling, the clamp device having a diameter smaller than the diameter of the strip drive wheel. A first transmission wheel is provided on a common axis with the strip drive wheel so as to transmit rotation to the strip drive wheel, a second transmission wheel is separately provided corresponding to the first transmission wheel, and a second transmission wheel is separately provided corresponding to the first transmission wheel, and The present invention is characterized in that a loop strip is stretched over two transmission wheels, and a fluid pressure cylinder is coupled to a linearly moving portion of the loop strip to drive the loop strip back and forth along the loop. .

<Operation> This invention uses a loop that extends the linear motion of a fluid pressure cylinder to a first transmission wheel and a second transmission wheel to a strip drive wheel that pushes and pulls a flexible strip coupled to a clamp device. The rotation of the first transmission wheel is converted into rotational motion via the strip. Since the circumferential speed of the strip drive wheel is greater than the circumferential speed of the first transmission wheel, the linear motion distance of the fluid pressure cylinder corresponds to the ratio of the circumferential speed of the strip drive wheel and the first transmission wheel. and is transmitted to the flexible strip. That is, the moving distance of the clamping device increases in accordance with the circumferential velocity ratio compared to the stroke of the hydraulic cylinder. Furthermore, since the linear moving portion of the loop strip is driven, there is no need to push or pull the ends of the flexible strip.

<Example> A first example will be described using FIGS. 1 and 2. This embodiment is applied to a device for clamping a mold to the slide of a press machine, and in the figure, 3 is a clamping device, 14 is a flexible strip, and 1
7 is a guide means, 20 is a drive wheel, 21 is a first transmission wheel, 22 is a second transmission wheel, 23 is a loop strip, 24
is a hydraulic cylinder.

The clamping device 3 is a conventionally known device that is operated by hydraulic pressure, and has an engaging portion 30 that engages with a T-groove 2 on the lower surface of the slide 1 of the press machine, and is movable along the T-groove 2. . Further, this clamp device 3 is connected to the tip of a hydraulic hose 31 as shown in the figure.
A signal cable 32 is also connected separately. The signal cable 32 is provided as necessary, and is connected to a switch 34 that detects when the clamp device 3 has reached the position of the press mold 33.

In this embodiment, the flexible strip 14 is provided with rollers 36 on both sides of the chain 35 as shown in the figure, and further provided with a holding part 37 for holding the hydraulic hose 31 and cable 32 at the link part of the chain 35. A one-sided bending prevention member 38 is provided to limit the bending of 35 in one direction. The flexible strip 14 is such that the roller 36 is guided by the wide part at the back of the T-groove 2 and can transmit pushing and pulling forces in the longitudinal direction. One end of the flexible strip 14 is coupled to an engaging portion 30 within the T-slot 2, and the other end is connected to the engaging portion 30 within the T-slot 2.
As shown, it is bent upwardly, extended vertically upward, and bent further to point downwardly and secure its proximal end in place. Hydraulic hose 31
The proximal end of is fixed near the fixed proximal end of the flexible strip 14, and is connected to a suitable hydraulic power source 39.
The relatively T of the portion of the flexible strip 14 coming out from the T groove 2
A sprocket serving as a driving wheel is provided near the end of the groove 2, and the driving wheel 20 engages with a chain 35 of the flexible strip 14. By rotating the drive wheel 20 in forward and reverse directions, the flexible strip 14 moves forward and backward along the T-slot 2, thereby causing the flexible strip 14 above the drive wheel 20 to move upward. The convex protruding end is displaced up and down.

The guide means 17 includes a guide 40 in contact with the roller 36 of the flexible strip 14 so as to regulate its position relative to the horizontal portion, bent portion, and vertical portion of the flexible strip 14 extending from the T-groove 2. , and the one-sided bending prevention member 38, and the upwardly convex protruding end is vertically displaced while remaining in an inverted U-shape.

The first transmission wheel 21 is a sprocket fixed to the shaft 41 together with the drive wheel 20, and its pitch diameter is 4/10 of the pitch diameter of the drive wheel 20.

The second transmission wheel 22 is a sprocket provided upwardly apart from the first transmission wheel 21, and in this embodiment has the same pitch diameter as the first transmission wheel 21, and is attached to the shaft 42. It is pivotally supported.

The loop strip 23 is a roller chain stretched between the first transmission wheel 21 and the second transmission wheel.

The fluid pressure cylinder 24 is an air cylinder,
The cylinder portion 24a is fixed to the slide 1 side, and the piston rod 24b moves up and down by supplying and discharging compressed air from an air source 43.
The upper end of the rod 24b is connected to the straight portion of the loop strip 23 in the tensioned state. Therefore, as the rod 24b moves back and forth, the loop strip 23 is reciprocated along the loop, causing the first transmission wheel 21 to rotate. In the figure, 44 is a connecting member between the rod and the loop strip, and 45 and 46 are stroke end detection switches of the rod (that is, forward and backward movement end detection switches of the clamp device).

In this clamp device push/pull drive device, when a mold is clamped, the fluid pressure cylinder 24 is operated from an extended state to a shortened state, so that the loop strip body 23 turns clockwise in FIG.
The transmission wheel 21, the shaft 41, and the drive wheel 20 are rotated, and the flexible strip 14 engaged with the drive wheel 20 is inserted into the T-slot 2.
The clamping device 3 is pushed forward to reach the press mold clamping position as shown by the solid line in the figure. When the switch 34 detects that this clamping position has been reached, the hydraulic power source 39
Pressure oil is supplied through the hose 31, and the clamping device 3 performs a clamping operation to fix the mold.

In addition, when releasing the clamp of the mold, the pressure oil from the hydraulic source 39 is cut off and the path from the hydraulic hose 31 is switched to the tank, so that the clamp device 3 is released by the built-in spring, and the clamp device 3 is released. The state of supply and discharge of compressed air from the compressed air source 43 to and from the fluid pressure cylinder 24 is switched by detecting the time set in the timer, whereby the fluid pressure cylinder 24 is operated in an extended state,
Contrary to the above, the loop strip 23 turns counterclockwise,
The clamp device 3 is pulled and moved to the retracted position so as to pull the flexible strip 14 out of the T-slot 2. This backward position is detected by detecting the position of the rod 24b by the switch 46. At this time, if a dummy block 47 corresponding to the clamped part of the mold is provided as shown in the figure, pressure oil is supplied to the clamping device 3 to clamp the block 47, and the clamping device 3 is fixed. state.

In this clamp device push/pull drive device, the forward and backward drive is performed by the fluid pressure cylinder 24.
During the transmission of the acting force, the first
Since the transmission wheel 21 and the drive wheel 20 are interposed, the speed of the flexible strip 14 side is increased, and the forward and backward distance of the clamp device 3 is greater than the stroke of the hydraulic cylinder 24 (this In the example, it becomes 2.5 times). Therefore, it is possible to use a fluid pressure cylinder with a stroke smaller than the necessary forward and backward movement distance of the clamp device 3, and the drive device can be downsized.

FIG. 3 shows a second embodiment, in which parts equivalent to those in the first embodiment are designated by the same drawing symbols. In this embodiment, the direction of the hydraulic cylinder 24 is vertically opposite to that of the first embodiment.

FIG. 4 shows a third embodiment, in which parts equivalent to those in the first embodiment are designated by the same drawing symbols. In this embodiment, the second transmission wheel 22 is located obliquely above the first transmission wheel 21, and the loop strips 23 are connected in a stepped manner at the connecting member 44 in the middle. The second and third embodiments also operate in the same manner as the first embodiment.

In the above embodiment, the loop strip 23 and the first,
Although the second transmission wheels 21 and 22 are formed from roller chains and sprockets, they may also be formed from toothed belts and gears.

<Effects of the invention> According to this invention, the ratio between the circumferential speed of the first transmission wheel and the circumferential speed of the driving wheel can be arbitrarily determined, and a fluid pressure cylinder with a stroke smaller than the necessary travel distance of the clamp device is used. Therefore, the fluid pressure cylinder can be made shorter, and the pushing/pulling drive device of the clamp device can be shortened in length, particularly in the longitudinal direction, so that it can be miniaturized so as not to be bulky in the longitudinal direction.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional front view of the first embodiment of this invention, Fig. 2 is a partially enlarged partial sectional view of the right side of Fig. 1, and Fig. 3 is a partial front view schematically showing the second embodiment. , FIG. 4 is a partial front view schematically showing the third embodiment, and FIG. 5 is a schematic partial front view in cross section showing an example of a conventional clamp device push/pull drive device using an air cylinder. 2... T groove, 3... Clamp device, 14... Flexible strip, 17... Guide means, 20... Drive wheel (stripe drive wheel), 21... First transmission wheel, 22... Second transmission wheel, 23... Loop strip, 24... Fluid pressure cylinder, 31... Hydraulic hose, 32... Signal cable.

Claims (1)

[Scope of utility model registration request] a clamping device movable along the T-slot;
a flexible strip having one end inserted into the T-slot from the T-slot end and coupled to the clamp device, and the other end positioned outside the T-slot; and a flexible strip extending from the T-slot end of the flexible strip. a strip drive wheel engaged with the section and configured to rotate to push and pull the flexible strip longitudinally to move the clamping device along the T-slot; In the push/pull drive device, a first transmission wheel having a diameter smaller than the diameter of the strip drive wheel is provided on a common axis with the strip drive wheel so as to transmit rotation to the strip drive wheel, and A second transmission wheel is separately provided corresponding to the first transmission wheel, a loop strip is stretched over the first and second transmission wheels, and a fluid pressure cylinder is connected to a linearly moving portion of the loop strip. A push-pull drive device for a clamp device, characterized in that the strip is configured to reciprocate along its loop.