JPS6053269A - Cam mechanism - Google Patents

Abstract

PURPOSE:To stabilize the action of an operating mechanism, by providing a canceling cam on a shaft for an operating cam, and applying pressure to both the cams from a link. CONSTITUTION:A canceling cam 40 is provided on a shaft 39 r an operating cam 37 so that load opposite to that upon the operating cam acts on the canceling cam. A pressure is applied to both the cams 37, 40 from a link 41 through rollers 36, 42. As a result, the heavy load upon the operating cam 37 is canceled by the load upon the canceling cam 40, and the load fluctuation is reduced. The action of an operating mechanism is thus stabilized.

Description

[Detailed Description of the Invention] This invention relates to a link (including a lever arm)
This invention relates to a cam mechanism that rotates by pressing a cam against a cam.

This type of cam mechanism rotates the cam while resisting the force of the bullet provided on the link, so the height difference between the unevenness of the cam is large, or the slope is steep, or this head and slope are When a relatively large number of relatively large cams are installed on the same axis, a considerably large load is applied to the camshaft.
The fluctuation of the load applied to the camshaft increases, and the operation of the actuating mechanism driven by the cam mechanism tends to become unstable.

The purpose of the present invention is to provide a cam mechanism that can solve these problems, and its characteristic structure is that in the cam mechanism that drives the actuating mechanism by elastically engaging the link with the cam, there are mutually contradictory mechanisms. A plurality of cams are coaxially formed to apply a load, and a link is provided to each cam so as to be brought into pressure contact with each other by the elastic force of the projectile.

Next, an embodiment based on the above two features will be described with reference to illustrative drawings.

First, an example of an automatic paper winding device for an enoki mushroom cultivation container driven by this kind of cam mechanism shown in FIG. 2 is shown in FIGS.
This will be explained with reference to the old working state diagram and time chart 1 in FIG.

Reference numeral 1 denotes a paper storage section in which a large number of fan-shaped papers 2 are stacked vertically and stored upside down, and is provided so as to be movable forward and backward by a cam mechanism A. In addition, the paper storage section 1 is provided with a push plate 4 that can shape the center portion of the stacked papers 2 so as to protrude in a yamabushi manner, and that can press and hold the paper 2 with the elastic force of a spring 30 depending on the size of the paper 2. Two stacked sheets of paper 2 are held between this press plate 4 and a presser member 5 provided in the two-sheet storage section 1. Note that the paper 2 may be stored as a flat bundle of paper without protruding like a mountain. Also, a large number of them may be stacked horizontally.

Reference numeral 6 denotes a pair of left and right arms that are arranged to face the paper 2 stored in the paper storage section 1, and a suction cup 7 is pivoted to the tip of each arm 6 by a support shaft 8 so as to be able to swing freely in the left and right directions. At the same time, the suction cup 7 is always given an elastic force by a spring 9 so as to swing inward, and is held by a stopper (not shown) in a state inclined inward at approximately 45 degrees. Further, an operating pin 10 is provided on the base side of the suction cup 70 so as to protrude from the suction cup 7 toward the paper 2 when the suction cup 7 is inclined inward at approximately 45 degrees. Tip! 108 is bent outward. Further, a pressure relief generator (not shown) such as a vacuum pump is connected to the suction cup 7. Reference numeral 11 denotes an inversion shaft to which the base of the arm 6 to which the suction cup 7 is attached is fixed, and is pivoted on a pair of left and right receiving plates 12. This reversing shaft 11 is provided with an appropriate reversing mechanism 13 operated by a cam mechanism A. In that case, in the drawing, the pinion 1 provided on the reversing shaft 11
A rack 13b is disposed to mesh with the rack 13b, and the arm 6 is configured to be reversed as the rack 13b moves up and down, but a rotary actuator (not shown) or the like may be used instead of the pinion rack.

14 is a mouth portion 1 of a cultivation container 16 supplied to a predetermined location 15
It is a curved paper presser following the shape of 6a, and the cam mechanism A
It is arranged so that it can move forward and backward. Although not shown, the pressure relief generating device of the suction cup 7 is turned off when the paper presser 14 moves forward, and turned on when it moves backward. 17 is a retaining member capable of retaining the cultivation container 16 at a predetermined location 15.

On both sides of a predetermined location 150 where the cultivation container 16 is held, there is a pair of rotating shafts 18 that are reciprocated at an appropriate angle by a cam mechanism A.
are installed vertically, and operating rods 19 are installed on the negative side of the rotating shaft 18, and one of the operating rods 19 is connected to an elastic curved lower winding arm 21 via a link 20. is pivotally attached to the support shaft 22 so as to be freely swingable, and a force directed toward the cultivation container 16 is constantly applied to the link 20 and the lower arm 21 by a spring 23, respectively. A -I winding arm 24 is pivotally attached to the other operating rod 19 by a support shaft 22a via a spring 25, and this upper winding arm 24 is made of an elastic material such as plastic and has a substantially C shape. A concave groove 27 is formed to accommodate a collar 26, and when the upper winding arm 24 is in a standby state, one of the collars 26 falls under its own weight and falls into the concave groove 2.
7, and when the upper winding arm 24 is operated, the shutter 28 works in conjunction with the upper winding arm 24 to prevent the collar 26 from falling due to its own weight.
is arranged above the upper winding arm 24. Further, each operating rod 19 has a paper receiving member 30 that contacts the lower end of the paper 2 and prevents the paper 2 from sliding down from a predetermined position.
is rotatably attached to the paper receiving member 30, and a force directed toward the cultivation container 16 is constantly applied to the paper receiving member 30 by a spring (not shown).

Therefore, as shown in the time chart of FIG. 3, when the paper storage section 1 moves forward due to the cam mechanism, the operating pin 10
The distal end 10a contacts the outermost paper 2 among the multiple stacked sheets of paper 2, and the actuating pin 10 moves outward as the paper storage section 1 moves forward, so it is integrated with the actuating pin 10. The suction cup 7 rotates outward, that is, toward the paper surface, against the elastic force of the spring 9, and the suction cup 7 becomes almost horizontal, following the paper surface, and the suction cup 7 rotates toward the paper surface as shown by the dashed line in FIG. 1 (5). Adsorbs to 2.

After that, when the paper storage section 1 is moved back by the cam mechanism A, one sheet of paper 2 remains attached to the suction cup 7, and the other sheets of paper 2 are moved back as the paper storage section 1 moves. As it retreats, the suction cup 7 moves inward by approximately 4 degrees due to the elastic force of the spring 9.
Paper 2 adsorbed to suction cup 7 to return to the 5 degree swing state
is shaped into a roughly U-shaped curve as shown by the solid line in Figure 1. In this case, the suction cup 7 is oscillated at approximately /15 degrees and held at 1 to 15 degrees, but the angle may be changed as appropriate as long as it is inclined inward at an appropriate angle. In addition, the paper storage section 1 has a mountain-shaped protrusion (
Although the push plate 4 is formed to make it easier to attract, the push plate 4 may be formed flat. In addition, paper storage section 1
Suction cup instead of side 7. The arm 6 side may be moved forward or backward.

Further, although the disc-shaped suction cup 7 is illustrated, its shape and structure may be changed as appropriate.

Next, the reversing mechanism 13 is operated by the cam machine WIA, so that the arm 6 changes direction by approximately 180 degrees, so that the upside down paper 2 is now facing forward and is already fed to a predetermined location 15 manually or by an appropriate feeding mechanism (not shown). cultivation container 1
The paper 2 is supplied to the opening 16a of the paper 2, and the curved portion 2a of the paper 2 is arranged so as to correspond to the opening 16a, and then, when the paper presser 14 is advanced by the cam mechanism A, the curved portion of the paper 2 2a is pressed against the peripheral surface of the opening 16a of the cultivation container 16, and the paper 2 is held along the outer peripheral surface of the opening 16a of the cultivation container 16 in a substantially U-shape as shown in the first drawing. Furthermore, in the above explanation, the arm 6 of the suction cup 7 is reversed and supplied to the opening 16a of the cultivation container 16, but the paper 2
In the normal state, the arm 6 of the suction cup 7 is arranged to move forward and backward with respect to the paper storage section 1, and the arm 6 moves forward and backward to remove a piece of paper 2.
After shaping into a curved shape, the arm 6 may be further advanced without being reversed to supply it to the mouth 16a of the cultivation container 16, and the configuration for supplying it may be changed as appropriate. 1
Reference numeral 7 denotes a retaining member that can hold the cultivation container 16 at a predetermined location 15.

After the paper 2 is transferred and held up to the opening 16a of the cultivation container 16 in this way, first the lower rotation shaft 18 is moved to the cam mechanism A.
The operating rod 19. The link 20 and the lower arm 21 move toward the cultivation container 16, and the tip of the curved lower arm 21 comes into contact with the paper 2.1. , then spring 23
By force and the action of the link 20, one side of the paper 2 is pressed against the opening 16a of the cultivation container 16 as shown in FIG. is rotated by the cam mechanism A, the operating rod 19 and the upper winding arm 24 move toward the cultivation container 16, the end of the collar 26 contacts the other side of the paper 2, and then the other side of the paper 2 is moved by the force of the spring 250. Mouth part 1 of cultivation container 16
6a, pull the paper 2 to smooth out the wrinkles, and wrap both ends of the paper 2 under -FZ. At the same time as the winding ends, the collar 26 separates from the groove 27 and automatically moves as shown in Figure 1 (■). The paper 2 is fitted onto the opening 16a and fixed by wrapping it around the paper 2. In this case, the paper receiving member 30 supports the lower end and side of the paper 2 in conjunction with the lower winding arm 21 and the second winding arm 24.

Thereafter, the upper winding arm 24, the lower winding arm 21, and the paper presser 14 return almost simultaneously, and the cultivation container 16 with the paper 2 wound thereon is transported out manually or by an appropriate transport mechanism. In that case, the lower winding arm 21 is moved by the link action.
It returns along the circumference of the opening 168 of the cultivation container 16. The above is just an example of a mechanism for fixing both sides of the paper 2 with the winding collars 26. In the above explanation, the collars 26 are formed so as to press directly against the paper 2 and wind it, but the upper winding arm 24 is It may be formed so that it is pressed directly against the paper 2 and wound, or the collar 26 and the upper winding arm 24 may be pressed against the paper 2 and wound at the same time. In the case of winding the paper, the collar may be fitted into the mouth of the cultivation container by winding the paper with the upper winding arm and then operating the collar storage section provided individually. Alternatively, without using a collar, it is also possible to provide a zipper or the like on both ends of the paper in advance so that when the paper is wrapped around the mouth of the cultivation container, the two ends of the paper are overlapped and fixed by the zipper or the like. .

Now, in the double cam mechanism A, the portion for driving the paper presser 14 will be described in more detail.After 1-1, a case in which the cam mechanism of the present invention is used for driving the paper presser will be exemplified.

That is, as shown in Fig. 4) (r3), a paper presser 14 is provided so as to be able to move forward and backward along the table 31 via a guide 32, and at the bottom of this paper presser 14 is a connecting rod 33. One end 33a is pivotally supported, and the other end 33b of this connecting rod 33 is pivotally supported on one side 35a of a ■7-shaped link 35 that is rotatably provided around a support shaft 34, and the other side 35b of the link 35. is engaged with the actuating cam 37 via a roller 36, and the link 35 is further provided with a spring 38 so that the roller 36 always springs into engagement with the actuating cam 37.

When the roller 36 is engaged with the convex arc portion 37a of the operating cam 37 as shown in FIG.
As shown by the dashed line, the concave circular link 35 rotates counterclockwise around the support shaft 34 due to the elastic force of the bullet 38, so the connecting rod 33 pushes the paper presser 14; Figure 4 (
As shown in (to), the roller 36 is connected to the concave arc portion 37 of the operating cam 37.
b, the paper presser 14 maintains its operating state, and the rotation of the operating cam 37 causes the roller 36 to move toward the stepped portion 37a as shown by the dashed line.
d, the link 35 rotates clockwise while resisting the force of the bullet 38, so the connecting rod 33 pulls the paper presser 14, causing the paper presser 14 to move backward and return.

Now, in this invention, as shown in FIG. 5, the operating cam 3 is
A counterbalance cam 40 formed to apply a load opposite to the load of the operating cam 37 is provided on the cam shaft 39 of No. engaged via roller 42, and further engaged via roller 42.
2 is provided in the link 41 with a bullet 43 for resiliently engaging with the offset cam 40. In this case, in the drawings, the offset cam 4o is formed by a concave arc portion 4oa having substantially the same shape as the convex arc portion 37a of the operating cam 37 and a convex arc portion 40b having substantially the same shape as the concave arc portion 37b of the operating cam 37. In addition, the roller 42 moves toward the prisoner in Figure 4, ■ in Figure 5, and the fourth part 40a.
This force offsets the large load applied to the actuating cam 37 as it moves down the stepped portion 40d, and the roller 42 climbs up against the elastic force 43 toward the elastic force applied to the cam 40, reducing load fluctuations.

Therefore, each step portion 37c of the actuating cam 37.

The cam 40 offsets the load fluctuation that occurs when reaching 37d.
By canceling each other out by the stepped portions 40C and 40d, it is possible to substantially smooth out the fluctuations in load, and it is also possible to rotate the camshaft 39 with a relatively small rotational force, so that the drive torque (capacity) is relatively low. It can also be provided by a small drive source such as a motor.

Note that the above-described offset cam may be provided for each operating cam, or may be provided only for the operating cam with large load fluctuations, or the offset cam may also be used as the operating cam.

Further, in the above-described embodiment, the convex arc portion and the concave arc portion of the actuating cam and the countervailing cam were made to have substantially contradictory shapes, but it is not necessary to have the above-mentioned shapes, and only the stepped portions may be made to have substantially contradictory shapes. Note that the term "cancelling cam" refers to a cam that performs actions that cancel each other out, and does not mean only that the forces cancel each other out to zero.

As described above, in a cam mechanism that elastically engages a link with a cup to drive an actuating mechanism, a plurality of cams are provided coaxially so that mutually opposing loads are applied to each cam. Since the links are provided in a press-contact state by the elastic force of the ammunition, load fluctuations can be suppressed and the operating mechanism can operate stably, resulting in excellent effects.

[Brief explanation of the drawing]

Figures 1 (5) to (g) are plan views of the automatic paper rolling device for enoki mushroom cultivation containers driven by a cam mechanism, Figure 2 is a side view, Figure 3 is a time chart, and Figure 4 (A ) (B) is a side view showing the cam mechanism of the paper presser, Figures 5 (A) and (B) are side views showing the offset cam mechanism, and Figures 6 (5) to (to) are side views showing the cam mechanism of the paper presser. FIG. 7 is a partially cutaway front view of the cam showing another embodiment. 36... Link 38... Operating cam 39... Bullet machine 4
0...Cam shaft 41...Offsetting cam 42...Link 44
...Ammunition patent applicant Ryo Nippon Seiki Co., Ltd. Figure 6 (A) ((j (B) (D) 40d 40c , -1-ha~42 /, q-'>-hehe Otsu nh JP-A-1986 ~53269(11) Fig. 7 4(,/″7\40a!n-N

Claims (1)

[Claims] In a mechanism that drives an operating mechanism by elastically engaging a link with a cup, a plurality of cams are provided coaxially so that mutually opposing loads are applied to each cam. A cam mechanism characterized by having links that are brought into pressure contact by force.