JPH02147516A - Clamp type commodity transferring device - Google Patents

Abstract

PURPOSE:To easily adjust the opening/closing positions of a pair of clamp shafts by installing a cam follower for the oscillating lever linked with the clamp shafts to relatively rotate and displace a plural number of cam member engaged in common. CONSTITUTION:When gripping and releasing a same commodity with clamp arms 5a, 5b, two pieces of cam members 30, 31 are not mutually rotated and displaced. Instead, a cam follower 28 is engaged in common with the cam face of these dam members 30, 31. Next, when changing the size of commodity, opening/closing positions of a pair of clamp shafts 19a, 19b are adjusted in accordance with the size of a container to be changed by relatively rotating and displacing these cam members 30, 31 with the cam follower 28 of an oscillating lever 27 linked to the clamp shafts 19a, 19b. That is, the spacing of the clamp arms 5a, 5b is adjusted to a dimension matching with the size of the container at the same rotation angle position.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a clamp-type article conveying device equipped with a pair of clamp arms that grip an article, and more specifically, the present invention relates to a clamp-type article conveying device that is equipped with a pair of clamp arms that grip an article, and more specifically, the present invention relates to a clamp-type article conveying device that is equipped with a pair of clamp arms that grip an article. The present invention relates to a clamp-type article conveying device that rotates and transfers as it rotates.

``Prior Art'' Conventionally, this type of clamp-type article conveyance device usually consists of a drive shaft rotatably supported on a frame, a rotating body provided on the drive shaft, and a rotating body supported by the rotating body and mutually connected to each other. A pair of clamp shafts that rotate in opposite directions, a pair of clamp arms that are provided on each clamp shaft and are opened and closed by the rotational movement of the clamp shafts, a swing lever that is linked to the clamp shaft, and a swing lever that is connected to the swing lever. and a cam member provided on the frame, the cam follower is engaged with a cam surface of the cam member, and the clamp shaft is rotated by swinging the swinging lever according to the cam curve of the cam surface. There is a known device in which the pair of clamp arms are opened and closed by using the clamp arm.

However, in conventional general clamp-type article conveyance devices, the opening/closing operation positions of the pair of clamp arms are uniquely determined according to the cam curve of the cam member, so, for example, the pair of clamp arms are closed to move a large article to a predetermined position. If the above cam curve is determined so that a small object can be gripped at that position, a small object cannot be gripped at that position, and the small object is gripped after the clamp arm is further closed, resulting in a different gripping position. becomes.

This also applies to the release position of the article; if the above cam curve is determined so that a large article can be released at a predetermined position, the small article will be released before it reaches that position, so the release position will be affected. The location will be different.

In order to solve these drawbacks, conventionally, a pair of clamp arms provided on the rotating body are biased in the closing direction by a spring, and a cam member is formed on the upper end of a cam member provided on the rotating body so as to be able to move up and down. It has been proposed that a conical part is interposed between both clamp arms, the cam member is placed on a cylindrical cam rail provided on a frame so as to be removable, and the cam rail is movable up and down. 1986-5
2096 Publication) According to the clamp-type article conveyance device having such a configuration,
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, so the opening/closing operation positions of both clamp arms are also constant, but the distance between the two clamp arms at the same rotation angle position is the same as that of the cam rail. By setting the interval to an interval suitable for grasping a large object or an interval suitable for grasping a small object, it is possible to grasp or hold both objects at the same rotation angle position. can be released.

``Problems to be Solved by the Invention'' However, when the cam member interposed between the above pair of clamp arms is moved up and down to open and close the clamp arms, the direction of the opening/closing operation of the clamp arms Since the vertical direction is perpendicular to the vertical direction, there are disadvantages in that the bearing portion of the clamp arm is likely to play, or the contact portion between the clamp arm and the cam member is likely to wear out.

"Means for Solving the Problems" In view of such circumstances, the present invention provides the above-mentioned conventional general clamp-type article conveyance device, in which at least two of the above-mentioned cam members are disposed so as to be rotatably displaceable relative to each other, and ,
The cam follower is commonly engaged with the cam surfaces of both cam members, and the open/close positions of the pair of clamp shafts can be adjusted in accordance with the rotational displacement positions of the cam members.

"Operation" According to the above configuration, when the same article is gripped and released by the clamp arm, there is no need for the at least two cam members to rotate relative to each other, and the cam follower is attached to the cam surfaces of both cam members. Since they only need to be engaged in common, there is no risk of malfunction due to wear or the like.

When the size of the article is changed, the opening and closing positions of the pair of clamp shafts can be adjusted extremely easily simply by relatively rotating the plurality of cam members. It becomes possible to adjust the spacing between the clamp arms to a spacing that corresponds to the size of the article.

``Example'' The present invention will be described below with reference to an illustrated example. In FIG. 1, a container 2 transported by a supply conveyor 1
is conveyed by the timing screw 3 in synchronization with the operation of the clamp type article conveying device 4 according to the present invention, and at a predetermined gripping position X, the pair of clamp arms 5a, 5
It is gripped by b.

The container 2 gripped by the pair of clamp arms 5a, 5b is conveyed with the rotation of the rotary body 6 constituting the clamp-type article conveyance device 4, and then released from the clamp arms 5a, 5b at a predetermined position Y. It is released and carried into a position directly below a filling nozzle (not shown) of the rotary filling machine 7.

As shown in FIG. 2, the clamp-type article conveyance device 4 includes a vertical drive shaft 17 rotatably supported on a frame 15 via a bearing 16, and a vertical drive shaft 17 provided at the upper end of the drive shaft 17. The lower end of the drive shaft 17 is interlocked with a motor (not shown).

The rotating body 6 is provided with a plurality of clamp mechanisms 18 at equal intervals on its outer circumference (see FIG. 1), and as shown in FIGS. 2 and 3, each clamp mechanism 18 A pair of clamp shafts 19a, 19 are vertically supported on
b, and gears 2 attached to each clamp shaft and meshed with each other.
0a, 20b, and clamp arms 5a, 5b attached to the top of each clamp shaft.

Therefore, by rotating one clamp shaft 19a in forward and reverse directions by a cam mechanism 21, which will be described later, the pair of clamp arms 5a and 5b can be opened and closed via the gears 20a and 20b.

Next, a swing lever 2 is attached to the lower end of the clamp shaft 19a.
One end of the swing lever 27 is fixed, and a 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 swinging lever 27
two cam members 30.3 which are rotationally biased in the direction of closing a, thereby arranging the cam followers 28 above and below.
They are commonly engaged with the outer peripheral cam surface of No. 1.

The cam members 30, 31 have large-diameter arcuate cam surfaces 30a, 31a and small-diameter arcuate cam surfaces 30b, each having the same shape.
, 31b, and large diameter arcuate portions 30a, 31
a, the cam follower 28 is displaced radially outward against the return spring 29, and the clamp arm 5
a, 5b are opened, and the small diameter arcuate portions 30b, 31
At b, the clamp arms 5a and 5b are closed by the elastic force of the return spring 29.

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

However, the two cam members 30 and 31 are connected to the drive shaft 1.
7 and fixed to the frame 15
A vertical connecting rod 36 fixed to the upper cam member 30 is made to pass through an arcuate groove 37 bored in the lower cam member 31 and protrude downward. A cam follower 38 is provided at the lower end.

In addition, the vertical connecting rod 3 fixed to the lower cam member 31
A cam follower 40 is also provided at the lower end of the cam follower 9 at the same height as the cam follower 38.

Then, arcuate grooves 41 are formed in the mating surfaces of the two cam members 30.31, and a compression spring 42 is elastically loaded in the hundred-circular grooves 41 to rotate both cam members 30.3I in opposite directions. The cam followers 38, 40 are biased against each other in the free state.

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

As shown in FIGS. 2 and 4, the movable plate 49 has a groove 50 formed in the radial direction, and a cam member 51 having a triangular tip cross section is slidably engaged in the groove 50. The leading end portions of the cam followers 38 and 40 are press-fitted between the pair of cam followers 38 and 40. And the movable plate 49
A screw shaft 52 rotatably supported by the cam member 51 is screwed into the cam member 51, and the cam member 5 is rotated by the rotation of the screw shaft 52.
I is displaced in the radial direction, and depending on the radial position of the cam member 51, the two cam members 30, 31 can be rotationally displaced in mutually opposite directions.

Further, the movable plate 49 is formed with protrusions 53 that protrude outward in the radial direction at predetermined positions, and as shown in FIG. It is located between 54 and 54. By rotationally moving the movable plate 49 using both adjustment screws 54, the circumferential position of the cam member 51 can be adjusted, thereby adjusting the center position of the two cam members 30 and 31. I have to.

In the above configuration, when the clamp-type article conveying device 4 grips and conveys the container 2, the movable plate 49 is first rotated by the pair of left and right adjustment screws 54, and the two cam members 3o, 31 are rotated together to position both cam members 30.3I at predetermined positions.

When grasping and transporting a 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 and 40 so that two The cam members 30, 31 are positioned at the position shown by solid line A in FIG.

On the other hand, when holding and transporting a small-diameter container 2b, the screw shaft 52 is rotated to displace the cam member 51 radially outward, thereby causing a pair of cam followers to engage with the cam member 51. 38, 40 is narrowed, and the two upper and lower cam members 30, 31 are positioned at position B shown by the imaginary line in FIG.

As can be understood from the solid line position A and the imaginary line position B of the cam members 30 and 31, when conveying a small diameter container 2b, the rocking movement The cam follower 28 provided on the lever 27 moves from the large diameter arcuate cam surface 30a of the upper cam member 30 to the small diameter arcuate cam surface 3.
It now transitions to 0b at a relatively early timing,
Therefore, the small-diameter container 2b and the large-diameter container 2a can be gripped at the same gripping position X.

Further, since the cam follower 28 shifts 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 can be released at the same release position Y.

Note that the cam member 51 is provided with a grooved cam, and the cam follower 38.40 of the cam member 30.31 is engaged with the grooved cam, so that the rotation angle position of the cam member 30.31 is adjusted according to the forward and backward movement of the cam member 51. may be adjustable.

Furthermore, in the embodiment described above, each rotation angle position of the two upper and lower cam members 3o and 31 can be adjusted simultaneously by one cam member 51, but it goes without saying that the positions may be adjusted separately.

"Effects of the Invention" As described above, according to the present invention, when the size of an article is changed, the cam followers of the swinging lever linked to the clamp shaft move the plurality of cam members that are commonly engaged with each other relative to each other. The opening and closing positions of the pair of clamp shafts can be adjusted extremely easily by simply rotating and displacing the cam members, and since the cam members only need to be moved during this adjustment, malfunctions may occur due to wear of the cam members. The effect that there is no fear can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
3 is a schematic plan view of the main part of FIG. 2, FIG. 4 is a sectional view along the rV-rV line of FIG. 2, and FIG. 5 is a cross-sectional view of the main part of FIG. It is a V direction arrow view of a figure. 5a, 5b--Clamp arm 6--Rotating body 17--Drive shaft 19a, +9b--Clamp shaft 27--Swing lever 30.31--Cam member 2.2a, 2b- Container 15--Frame 18--Clamp mechanism 21--Cam mechanism 28--Cam follower

Claims (1)

[Scope of Claims] A drive shaft rotatably supported on a frame, a rotating body provided on the drive shaft, and a pair of clamp shafts supported by the rotating body and rotated in opposite directions, A pair of clamp arms provided on each clamp shaft and opened and closed by the rotation of the clamp arms, a swinging lever interlocked with the clamp shaft, a cam follower provided on the swinging lever, and a cam provided on the frame. the cam follower is engaged with a cam surface of the cam member, and the clamp shaft is rotated by swinging of the swing lever according to the cam curve of the cam surface to open and close the pair of clamp arms. In the clamp-type article conveyance device, at least two of the cam members are arranged so as to be relatively rotationally displaceable, and the cam follower is commonly engaged with the cam surfaces of both cam members, and the cam members are rotatably displaced. A clamp-type article conveyance device, characterized in that the opening and closing positions of the pair of clamp shafts can be adjusted depending on the position.