JPH0123302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp device for attaching a sheet to a sheet forming truck, and particularly relates to an improvement in an opening/closing device related to an operating mechanism in the clamp device.

A molding system for resin sheets or plastic metal sheets includes a mounting station that attaches the raw material sheet onto a trolley, a heating station that heats the sheet, a forming station that molds the heated sheet, and an unloading station that removes the molded product. Stations are included, and the carriage is adapted to circulate through the stations. This truck is rectangular, and the sheet is held by sheet pressing members provided on each side of the truck. In addition to the holding member, this sheet clamping device includes a shaft provided on each side of the trolley to which related holding members are attached, and a receiving member on a base that is located below the holding member and clamps the sheet between them. , an operating mechanism for rotating the shaft to clamp or release the seat; the operating mechanism pivots an operating section at one end of a pivoted arm up and down by an opening/closing device having a generally U-shaped gripping section; It is operated by means of clamping or releasing the sheet.

However, the operating mechanism of the conventional clamp device is
It is operated by an opening/closing device consisting of a pair of cylinder devices as shown in the figure, and the gripping portion that engages with the operating portion and pivots it up and down is moved by the combination of the forces of the two cylinder devices. Therefore, it is difficult to adjust the pressure and the operating condition is unstable.
The grip part sometimes came off from the operating part.

The present invention overcomes the above-mentioned drawbacks of the prior art, and therefore an object of the present invention is to provide an opening/closing device for a seat clamping device that allows stable movement with one cylinder device and therefore has high reliability. It is.

In order to achieve the above object, the opening/closing device according to the present invention is characterized in that the grip part is moved by one cylinder device, and a cam follower is provided on the support body of the grip part, and a part of the support body of the grip part is moved by a cam follower. The movement of the gripping portion is ensured by guiding through a vertical slot formed in the plate and guiding the follower through a cam groove in a cam plate, which will be explained below with reference to the drawings.

FIG. 1 and FIG. 2 show the entire sheet forming truck to which the present invention relates, and the sheet clamping device includes a sheet holding member 1 located on each side of the truck.
, a shaft 3 connected to the presser member 1 via the bracket 2, an operating mechanism 4 provided at an appropriate position on the trolley for rotating the shaft 3, and a pedestal 5 that holds the sheet S between the presser member 1. It includes an upper receiving member 6. Each shaft 3 is preferably supported by a bearing 7 and connected at its end to an adjacent shaft 3, such as by a bevel gear 8, thereby providing one operating mechanism 4.
This makes it possible to manipulate the axis 3 of each side, simplifying the structure and facilitating automation. Note that the bogie has a framework made up of a frame 9 and is equipped with wheels 10 that run on rails.

As shown in FIGS. 2 and 3, the operating mechanism 4 includes a first arm 12 pivoted to a column 11 and a second arm 13 whose one end is fixed to the shaft 3. The roller 14 of the second arm 13 is engaged with the elongated hole 15 of the second arm 13, and the shaft 3 is rotated by the second arm 13 by vertically pivoting the operating portion 16 at the end of the first arm. and presser member 1
is adapted to be lifted or pushed down relative to the receiving member 6 below. The operating section 16 is generally fitted with a U-shaped gripping section 17 and is operated as the gripping section moves up and down, but in the conventional device, as shown in FIG.
Since the gripping portion 17 was moved by the grippers 8 and 19, the above-mentioned drawbacks occurred.

In the opening/closing device according to the present invention, as shown in FIG. 3, at least one cam follower 21 is provided on the support 20 of the gripping portion, and the follower 21 engages with a cam groove 23 of a vertical cam plate 22. It also includes one cylinder device 24 as a driving body. The cylinder device may be of either a hydraulic type or a pneumatic type, and as shown in the figure, the lower end of the cylinder device 24 is pivoted. The cam plate 22 is provided with a guide, preferably a vertical elongated slot 25, as clearly shown in FIG.
5 is engaged. This portion 26 is preferably a roller as shown. Lower part 2 of cam groove 23
3' is arcuate and has a vertical top. In addition,
Portion 26 of support 20 may be a slider. In a preferred embodiment, a pair of cam plates 22 are included, as shown in FIG. A roller 26 is provided, and the follower 21 and roller 26 provided on both sides of the roller 26 engage with the cam groove 23 and guide 25 of the corresponding cam plate 22. It is preferable to install the cam plates 22 on both sides of the support body 20 in this way from the viewpoint of force balance. Note that a pair of wheels 27 are provided on both sides of the support body 20, respectively.
Each is pressed against the surface of the cam plate 22 and rolls,
The movement of the support body 20 is made smooth. Also, the third
As shown in the drawings and FIG. 5, guide rollers 28 may be provided on both sides of the roller 26 in order to stabilize its movement.

Next, the operation will be explained. Before the grip part 17 engages with the operating part 16, the support body 20 is inclined as shown in FIGS. 3 and 4, and the roller 2
6 is located at a position centered on 0, and the follower 2
1 is located at the circular arc portion 23' of the cam groove 23. The arc portion 23' of this cam groove is an arc centered on point 0 of the guide 25. When the piston rod of the cylinder device 24 is extended, the gripper 17 connected thereto
The support body 20 rises, but its movement is regulated by the engagement between the cam groove 23 and the follower 21 and the engagement between the guide 25 and the roller 26, and the roller 26 initially remains at the point 0, The follower 21 moves along the arcuate portion 23' of the cam groove 23. Therefore,
The gripping portion 17 moves in an arc while rising slightly to the right in the figure, reaches the position from A to B in FIG. 4, and grips the operating portion 16 in its mouth. As the cylinder device 24 further extends, both the follower 21 and the roller 26 rise along their respective cam grooves or guides, and the gripper 17 rises vertically through position C to position D. At this time, since the arm 12 that supports the operating section 16 is pivoted, the operating section 16 moves up following an arcuate trajectory. Therefore, at intermediate position C, the operating section 16 enters the innermost part of the gripping section 17. Further, the gripping portion has sufficient depth to allow such movement of the operating portion 16.
When the operating portion 16 is raised in this manner, the first arm 12 is rotated to the right, the second arm 13 is rotated to the left, and the presser member 1 is lifted, so that the sheet S is released.

When the cylinder device 24 operates to retract,
Following the opposite path to the previous one, the gripper 17 initially descends vertically and traces D→C→B, at which time the roller 26 reaches point 0 on the guide 25, and then the roller 26 remains at that position. Then, the follower 21 follows the arc portion 23' of the cam groove 23, and in the process, the gripping part 17 retreats and leaves the operating part 16, returning to its original position A.
Return to When the operating portion 16 is lowered in this manner, the presser member 1 is pressed down in the opposite manner to the previous state, and the sheet is pressed between the presser member 1 and the receiving member 6 below.

Therefore, one cylinder device 24 is used as a driving source.
is used, and the movement of the gripping part 17 is restrained by the engagement of the cam groove and the cam follower, so the movement is reliable and stable, and the gripping part 17 does not come off from the operating part 16. .

In the illustrated example, the cam plate and the pair of followers and rollers that engage with it are provided on both sides of the support body of the gripping portion, but they do not necessarily have to be on both sides, and may be supported by wheels 27 or the like. The cam plate etc. may be provided only on one side as long as the body 20 is guided smoothly.

As described above, according to the present invention, since the operation unit is driven by one cylinder device and its movement is restrained by the cam mechanism, the movement of the operation section becomes stable, and the operation of the operation mechanism is significantly reduced. It can be made highly reliable.

[Brief explanation of drawings]

FIG. 1 is a plan view of a sheet forming truck, FIG. 2 is a side view thereof, FIG. 3 is a side view of an example of the opening/closing device of the present invention, and FIG. 4 is an explanatory diagram of the operation of the embodiment of FIG. 3.
FIG. 5 is a front view of the embodiment shown in FIG. 3, and FIG. 6 is a diagram schematically showing a conventional opening/closing device. In the figure, 4... operating mechanism, 16... operating section, 17
... Grip part, 20 ... Support body, 21 ... Cam follower, 22 ... Cam plate, 23 ... Cam groove, 24
... Cylinder device, 25 ... Guide, 26 ... Part of support (roller).

Claims (1)

[Scope of Claims] 1. An opening/closing device having a generally U-shaped gripping part that engages with an operating part of an operating mechanism of a device for clamping a sheet to be formed, wherein at least one gripper is attached to a support of the gripping part. A cam follower, a cylinder device in which a tip of a piston rod is connected to the support body or a gripping part, and at least one cam plate having a cam groove for guiding the follower, the cam groove having an arcuate lower part. An opening/closing device for a seat clamp device, characterized in that the cam plate is vertically formed on the cam plate, and a vertical slot for vertically guiding a part of the support body is formed in the cam plate. 2. In the opening/closing device according to claim 1, the support body is provided with two of the followers and includes two of the cam plates, and one cam plate and one cam plate are provided on both sides of the support body, respectively. An opening/closing device for a seat clamp device in which one of the followers is arranged. 3. The opening/closing device for a sheet clamp device according to claim 1, wherein the follower is a roller.