JPH0541688U - Hand opening / closing cam of centrifuge - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a centrifuge,
The purpose thereof is to reduce wear of the cam in the robot hand to enable smooth operation and to reduce cost. [Structure] The bearing 11 is attached to the cam body 10 via a spacer 12 with a screw 13 so that the outer ring of the bearing can be rotated to eliminate wear, and the number of machining steps is reduced as compared with the conventional cam 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal separator having a robot hand that holds a rack and sets it on a rotor.

[0002]

[Prior Art]

 The robot hand of a conventional centrifuge uses a pair of fingers that open and close to the left and right to grip and separate the rack, and the fingers are placed on both sides of the cam that is rotated by the motor. The shape of the cam is controlled from a large circle and a small circle so that even if the cam stop position shifts, the fingers can be opened and closed to ensure the maximum open state and maximum closed state. It was composed, but the cost of machining was high.

[0003]

[Problems to be solved by the device]

 In the robot hand of the conventional centrifugal separator, the shape of the cam is complicated and the cost of machining is high.

An object of the present invention is to reduce the cost of the cam as much as possible.

[0005]

[Means for Solving the Problems]

 The above objective is accomplished by using a ball bearing in the small circle of the cam. In other words, it is not necessary to machine the small circle part of the cam, so the cost is reduced accordingly.

Further, since the bearing outer ring can rotate, friction with the contact portion is reduced when the cam operates, and thus wear is reduced. Therefore, a thin ring of the same size as the bearing inner ring is inserted between the bearing and the cam body so that the outer ring does not contact the cam body when the bearing is attached to the cam body. At this time, make sure that the screws that pass through the bearing inner ring do not contact anything other than the bearing inner ring.

[0007]

[Action]

 The cam of the robot hand configured as described above can be regarded as the one in which the small circle part is replaced with a bearing or the like, and the cost can be reduced by eliminating the need to machine the small circle part.

Regarding the mounting position of the bearing or the like that replaces the small circle, if the rotation center of the cam and the center of the bear ring are not fixed in agreement, the closing action of the fingers of the hand is eccentric, which is not good.

The reason why the bearing outer ring is allowed to rotate is to reduce wear on the contact surface.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a main overall view of a centrifugal separator according to an embodiment of the present invention.

The centrifuge 1 is equipped with a robot hand 3 that holds the rack 2. The robot hand 3 has a cam 5 connected to the motor 4 in the center as shown in FIG. 1, and is housed in a slide base 9 so that the finger 7 and the finger 8 are pulled toward the center by a tension coil spring 6 as shown in FIG. There is. As shown in FIG. 4, the cam 5 is constituted by a cam body 10 and a bearing 11 with a spacer 11 sandwiched therebetween and fixed by screws 12.

The rotation of the cam 5 causes the fingers 7 and 8 to slide and open or close. The cam body 10 is in an open state when the longitudinal direction is in contact with the fingers 7 and 8, and is in a closed state when the bearing 11 is in contact. The shape of the cam body 10 forms a part of a great circle like the conventional cam 14 shown in FIG. Has become. This also applies to the bearing 11.

The effect peculiar to the embodiment is that since the bearing outer ring can rotate, there is no wear on the small circles of the fingers and the cam.

Further, since the shape of the machined portion can be made simpler than the shape of the conventional cam 14, the cost can be reduced.

[0016]

[Effect of the device]

 As described above, according to the present invention, since the bearing is formed as a part of the cam, the wear at the contact portion is eliminated, and the machining portion is simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a robot hand according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a perspective view of a conventional cam.

FIG. 4 is a perspective view of a cam according to the present invention.

FIG. 5 is an overall view of a centrifugal separator according to the present invention.

[Explanation of symbols]

 5 Cam 10 Cam body 11 Bearing 12 Spacer 13 Screw

Claims (1)

[Scope of utility model registration request] 1. A centrifuge device having a robot hand that automatically holds a rack on which a sample container is erected and takes it in and out of a rotor, wherein the robot hand comprises:
It has a cam that is driven to rotate by a motor, and the shape of the cam consists of one kind of great circle and one kind of small circle.
The small circle is a centrifuge characterized by comprising one bearing, and a hand opening / closing cam of the centrifuge characterized in that the bearing outer ring can be rotated.