JPH0761813B2 - Clamp type article carrier - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clamp type article conveying device provided with a pair of clamp arms for gripping an article, and more specifically, an article gripped by the clamp arm for a rotating body. The present invention relates to a clamp type article conveying device which is rotatably transferred with rotation.

[Prior Art] Conventionally, this type of clamp-type article conveying device is usually a drive shaft rotatably supported on a frame, a rotating body provided on the drive shaft, and mutually supported by the rotating body. A pair of clamp shafts that rotate in opposite directions, a pair of clamp arms that are provided on each clamp shaft and that are opened and closed by the rotation of the clamp shafts, a swing lever that is interlocked with the clamp shafts, and a swing lever. A cam follower provided and a cam member provided on the frame are further provided, the cam follower is engaged with the cam surface of the cam member, and the clamp shaft is rotated by swinging the swing lever according to the cam curve of the cam surface. It is known that the pair of clamp arms are opened and closed.

However, in the conventional general clamp type article conveying apparatus, the opening / closing operation position of the pair of clamp arms is uniquely determined according to the cam curve of the cam member. If the above-mentioned cam curve is set so that it can be gripped at a certain position, it is not possible to grip a small product at that position, and the clamp arm grips a small product after the clamp arm is further closed. Becomes

This also applies to the release position of the article.If the above-mentioned cam curve is set so that a large article can be released at a predetermined position, the small article will be released before reaching that position. The position will be different.

In order to solve such a drawback, conventionally, a pair of clamp arms provided on the rotating body is biased by a spring in a closing direction, and is formed at an upper end portion of a cam member provided on the rotating body so as to be vertically movable. It has been proposed that a conical portion is interposed between both clamp arms, the cam member is rotatably mounted on a cylindrical cam rail provided on a frame, and the cam rail can be moved up and down. Kai 62-5209
No. 6) According to the clamp type article conveying device having such a configuration,
Since the amount of elevation of the cam member due to the rotation of the rotating body is constant according to the cam curve of the cam rail, the opening / closing operation position of both clamp arms is also constant, but the interval between both clamp arms at the same rotation angle position is the same as the cam rail. Since it can be adjusted by setting the interval to an interval suitable for gripping a large article or an interval suitable for gripping a small article, both articles can be gripped at the same rotation angle position or Can be released.

[Problems to be Solved by the Invention] However, when the cam member interposed between the pair of clamp arms is moved up and down to open and close the clamp arm, the opening and closing operation direction of the clamp arm and the cam member Since the vertical direction is orthogonal to each other, there is a drawback that the bearing portion of the clamp arm is easily loosened or the contact portion between the clamp arm and the cam member is easily worn.

[Means for Solving the Problems] In view of such circumstances, the present invention provides at least two cam members in the above-described conventional general clamp-type article conveying device so as to be relatively rotationally displaceable. ,
The cam followers are commonly engaged with the cam surfaces of both cam members, and the open / close positions of the pair of clamp shafts can be adjusted according to the rotational displacement positions of the cam members.

[Operation] According to the above configuration, when grasping and releasing the same article by the clamp arm, it is not necessary for the at least two cam members to be rotationally displaced relative to each other, and the cam follower is provided on the cam surfaces of both cam members. Since they only need to be engaged in common, there is no risk of malfunction due to their wear or the like.

When the size of the article is changed, the opening / closing positions of the pair of clamp shafts can be adjusted very easily by relatively rotationally displacing the plurality of cam members. It is possible to adjust the interval between the clamp arms to an interval according to the size of the article.

"Example" The present invention will be described below with reference to the illustrated example. In Fig. 1, the container 2 conveyed by the supply conveyor 1 is shown.
Is conveyed by the timing screw 3 in synchronism with the operation of the clamp type article conveying device 4 according to the present invention, and is grasped by the pair of clamp arms 5a, 5b at a predetermined grasping position X.

Container 2 held by the pair of clamp arms 5a and 5b
Is conveyed with the rotation of the rotating body 6 which constitutes the clamp type article conveying device 4, and is then released from the clamp arms 5a and 5b at a predetermined releasing position Y, so that the filling nozzle (not shown) of the rotary filling machine 7 is released. It is carried to the position directly below.

As shown in FIG. 2, the clamp type article conveying device 4 has a vertical drive shaft 17 rotatably supported by a frame 15 via a bearing 16, and the above-described clamp provided on the upper end of the drive shaft 17. And a lower end portion of the drive shaft 17 is interlocked with a motor (not shown).

The rotary body 6 is provided with a plurality of clamp mechanisms 18 at equidistant positions on its outer peripheral portion (see FIG. 1).
As shown in the figure, each clamp mechanism 18 includes a pair of clamp shafts 19a and 19b vertically supported on the rotating body 6, gears 20a and 20b attached to the clamp shafts, and further meshed with each other. Clamp arms 5a and 5b mounted on top of the clamp shaft
Is equipped with.

Therefore, one of the clamp shafts 19a is connected to the cam mechanism 2 which will be described later.
By rotationally driving in the forward and reverse directions by 1, the pair of clamp arms 5a, 5b can be opened / closed via the gears 20a, 20b.

Next, one end of a swing lever 27 is fixed to the lower end portion of the clamp shaft 19a, and the cam follower 28 constituting the above-mentioned cam mechanism 21 is attached to the other end of the swing lever 27.
Then, a return spring 29 provided between the rotating body 6 and the swing lever 27 urges the clamp shaft 19a to rotate in a closing direction, whereby two cam members 30 in which the cam follower 28 is vertically arranged, The outer peripheral cam surfaces of 31 are commonly engaged.

The cam members 30 and 31 are provided with large-diameter arcuate cam surfaces 30a and 31a and small-diameter arcuate cam surfaces 30b and 31b, which have the same shape, and are connected to the return spring 29 by the large-diameter arcuate portions 30a and 31a. On the contrary, the cam follower 28 is displaced outward in the radial direction to open the clamp arms 5a and 5b, and in the small-diameter arcuate portions 30b and 31b, the clamp arms 5a and 5b are closed by the elastic force of the return spring 29. I have to.

A pair of upper and lower cam members 30, 31 are arranged at different positions in the circumferential direction by a predetermined amount, and the cam follower 28 has at least one of the large-diameter arcuate cam surfaces.
The clamp arms 5a and 5b can be maintained in the open state as long as they are engaged with the 30a and 31a.

However, the two cam members 30 and 31 are rotatably provided on the outer periphery of the tubular member 35 arranged on the outer periphery of the drive shaft 17 and fixed to the frame 15, and fixed to the upper cam member 30. A vertical connecting rod (36) penetrates an arcuate groove (37) formed in a lower cam member (31) and projects downward, and a cam follower (38) is provided at the lower end thereof. Also, the lower cam member
31 A cam follower 40 is also provided at the same height as the cam follower 38 at the lower end of the fixed vertical connecting rod 39.

Then, arcuate grooves 41 are formed on the mating surfaces of the two cam members 30, 31, respectively, and compression springs 42 are mounted in the arcuate grooves 41 to rotate the cam members 30, 31 in opposite directions. The cam follower 38 in the free state,
The 40 are in contact with each other.

A fixed plate 48 is attached to the tubular member 35 fixed to the frame 15, and a movable plate 49 rotatable about the tubular member 35 is provided on the fixed plate 48.

As shown in FIGS. 2 and 4, a groove 50 is formed in the movable plate 49 in the radial direction, and a cam member 51 having a triangular cross-section is slidably engaged in the groove 50. The front end portion is press-fitted between the pair of cam followers 38 and 40. Then, a screw shaft 52 rotatably supported by the movable plate 49 is screwed into the cam member 51, and the cam member 51 is displaced in the radial direction by the rotation of the screw shaft 52. The two cam members 30 and 31 can be rotationally displaced in mutually opposite directions depending on the position.

Further, the movable plate 49 is formed with a projection 53 projecting outward in the radial direction at a required position. As shown in FIG. 5, the projection 53 is provided on the fixed plate 48 with a pair of left and right adjusting screws. It is arranged between 54. And both adjusting screws 54
By rotating the movable plate 49, the circumferential position of the cam member 51 can be adjusted, whereby the center positions of the two cam members 30, 31 can be adjusted.

In the above configuration, when the container 2 is gripped and transported by the clamp type article transport device 4, first, a pair of left and right adjusting screws is used.
The movable plate 49 is rotated by 54, and the two cam members 30 and 31 are integrally rotated accordingly, so that both cam members 30 and 31 are positioned at predetermined positions.

When gripping and transporting the large-diameter container 2a, the screw shaft 52 is rotated to displace the cam member 51 inward in the radial direction, thereby widening the interval between the cam followers 38, 40 and separating the upper and lower two. The cam members 30 and 31 are placed at the positions shown by the solid line A in FIG.

On the other hand, when gripping and transporting the small-diameter container 2b,
The screw shaft 52 is rotated to displace the cam member 51 outward in the radial direction, thereby narrowing the interval between the pair of cam followers 38, 40 engaged with the cam member 51, and the upper and lower two cam members 30, 31. Is positioned at a position B indicated by an imaginary line in FIG.

As understood from the solid line position A and the imaginary line position B of the cam members 30 and 31, when the small-diameter container 2b is conveyed,
Compared with the case of transporting a large diameter container 2a, the swing lever 27
The cam follower 28 provided in the upper part of the cam member 30 moves from the large-diameter arcuate cam surface 30a to the small-diameter arcuate cam surface 30b at a relatively early timing.
2b and the large diameter container 2a can be gripped at the same grip position X.

Further, since the cam follower 28 comes to move from the small-diameter arcuate cam surface 31b of the lower cam member 31 to the large-diameter arcuate cam surface 31a at a relatively late timing, the small-diameter container 2b and the large-diameter container 2a. And can be released at the same release position Y.

The cam member 51 is provided with a groove cam, and the cam followers 38 and 40 of the cam members 30 and 31 are engaged with the groove cam, and the rotational angular position of the cam members 30 and 31 is changed according to the forward and backward movement of the cam member 51. May be adjustable.

Further, in the above embodiment, the rotational angle positions of the upper and lower two cam members 30 and 31 can be simultaneously adjusted by the single cam member 51, but it goes without saying that the positions can be adjusted separately.

[Advantages of the Invention] As described above, according to the present invention, when the size of the article is changed, the cam followers of the rocking levers interlocked with the clamp shafts are relatively engaged with each other. It is possible to extremely easily adjust the open / close positions of the pair of clamp shafts by simply rotatively displacing them, and since the cam members only have to be moved during the adjustment, malfunctions due to their wear or the like occur. The effect that there is no fear is obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG.
Sectional drawing which expands and shows the principal part of a figure, FIG. 3 is a schematic plan view of the principal part of FIG. 2, FIG. 4 is sectional drawing which follows the IV-IV line of FIG. 2, FIG. It is a V direction arrow view of a figure. 5a, 5b ... Clamp arm, 2, 2a, 2b ... Container 6 ... Rotating body, 15 ... Frame 17 ... Drive shaft, 18 ... Clamp mechanism 19a, 19b ... Clamp shaft, 21 ... Cam mechanism 27 …… Swing lever, 28 …… Cam follower 30, 31 …… Cam member

Claims (1)

[Claims] 1. A drive shaft rotatably supported by a frame,
A rotating body provided on the drive shaft, a pair of clamp shafts that are pivotally supported by the rotating body and rotate in mutually opposite directions, and a pair of clamps that are provided on each of the clamp shafts and are opened and closed by the rotating operation thereof. An arm, a swing lever linked to the clamp shaft, a cam follower provided on the swing lever, and a cam member provided on the frame, and the cam follower is engaged with the cam surface of the cam member, In a clamp type article transporting device in which a clamp shaft is rotated by the swing of the swing lever according to a cam curve of the cam surface to open and close the pair of clamp arms, at least two cam members are provided relative to each other. Are arranged so that they can be rotationally displaced, and the cam followers are commonly engaged with the cam surfaces of both cam members, and the pair of the cam members of the pair of cam members are arranged in accordance with the rotational displacement positions of the cam members. A clamp-type article conveying device characterized in that the opening / closing position of the clamp shaft can be adjusted.