JPS6032059B2 - Variable stroke lever mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable stroke lever mechanism.

Generally, in a device as shown in FIG. 1 in which the driven member 1 is driven by a cam 2 and a bar 3, in order to change the amount of movement of the driven member 1, the rotation range of the lever 3 is restricted by a stopper 4. The amount of movement of the driven member 1 is changed.

However, when the rotation range of the lever 3 is restricted in this way, the cam follower 5, which is pivotally attached to the tip of the lever 3, does not follow the entire circumference of the cam 2, but starts to follow the cam from the middle of the cam curve. 5 means that engagement and disengagement are repeated. For this reason, especially when the cam is rotated at high speed, there is a drawback that vibration and noise are generated due to the shock when the cam 2 and the cam follower 5 come into contact with each other. Therefore, as another method for changing the amount of movement of the driven member 1, in order to change the circular motion of the lever 3 into a linear motion, a cam follower 6 interposed between the driven member 1 and the bar 3 is moved to the lever 3. A method of changing the amount of movement of the driven member 1 by providing a large number of mounting holes and moving the mounting position of the cam follower 6 to the lever 3;
A conceivable method is to drill a large number of holes for connecting the pin 7 that rotatably supports the lever 3, and to change the amount of movement of the driven member 1 by moving the fulcrum of the lever 3. .

However, both of the above methods have the disadvantage that the amount of movement of the driven member 1 can only be changed in steps, and the amount of movement of the driven member 1 cannot be adjusted.
In the case of the method of changing the mounting position of the cam follower 6 on the lever 3, there was also a drawback that the amount of movement of the driven member 1 could not be changed unless the mounting position of the cam follower 6 was moved.

The present invention has been made to improve and eliminate the above-mentioned conventional drawbacks, and the present invention will be described below in accordance with the embodiments shown in the drawings. In Figures 2 to 4, 1
0 is a driven member, 11 is a cam lever, and 12 is a first member that is coupled to the driven member 10 which is pivotally connected to the upper end of the cam lever 11.
A cam follower 13 is a second cam follower 15 connected to the lower end of the cam lever 1 via a pivot shaft 14.
is a cam that comes into contact with the second cam follower 13.

Reference numerals 16 and 17 denote cam lever holders whose one end is pivotally attached to the brackets 18 and 19 and the other end is fitted to the pivot shaft 14 so as to be freely rotatable. It is held movably through the

20 is a 1" turn spring for bringing the second cam follower 13, which is connected to the cam lever 11 via the pivot shaft 14, into contact with the cam 16; 21 is a cam follow fixed to approximately the center of the cam lever 11;

22 is an L-shaped fulcrum lever; 23 is a fulcrum position adjusting bolt 2 that allows the fulcrum lever 22 to rotate freely;
A third cam follower 25 is pivotally attached to one end of the fulcrum lever 22 and engages with a groove 24 formed in the cam follower receiver 21. A fulcrum position adjustment bolt 26 for rotating the lever 22 is connected. Incidentally, the superposition turn spring 20 is unnecessary when the cam 15 is a grooved cam. In the above configuration, when the cam 15 is rotated to cause the outer circumference of the cam 15 to follow the second cam follower 13, the cam lever 11 is moved between the concave groove 24 of the cam follower receiver 21 fixed to the cam lever 11 and the third cam follower 25. The cam lever 11 rotates using the contact point as a fulcrum.
and the driven member 10 connected via the first cam follower 12 is slid by a predetermined amount.

To change the amount of movement of the driven part village 10, . When the fulcrum position adjustment bolt 26 is operated to rotate the fulcrum lever 22, the third cam follower 25, which is pivoted to the tip of the fulcrum lever 22, slides within the groove 24 of the cam follower receiver 21, and the third cam follower 25 slides into the groove 24 of the cam follower receiver 21. Since the point of contact with the third cam follower 25 moves to change the position of the fulcrum of the cam lever 11, the amount of movement of the driven member 10 can be changed. As explained above, the present invention rotates the fulcrum lever to continuously change the contact point between the third cam follower attached to the tip of the fulcrum lever and the concave groove of the cam follower receiver fixed to the cam lever. Since the fulcrum of the cam lever can be continuously moved, the amount of movement of the driven member can be freely adjusted, and the amount of movement of the driven member can be easily finely adjusted.

Furthermore, this invention adjusts the amount of movement of the driven member by changing the position of the fulcrum of the cam lever, and the second cam follower connected to the lower end of the cam lever via a pivot always follows the cam. Even if the cam is rotated at high speed, no vibration or noise is generated between the cam and the second cam follower.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a mechanism for sliding a driven part village by a predetermined amount by a subordinate cam, FIG. 2 is a front view showing the foundation of a variable stroke lever according to the present invention, and FIG. 3 is a side view thereof. FIG. 4 is an enlarged sectional view taken along line 1-1. DESCRIPTION OF SYMBOLS 10... Driven part village, 11... Cam lever, 12... First cam follower, 13... Second cam follower, 14... Pivot, 15...・
Cam, 16, 17...cam lever holder, 21...force follower, 22...fulcrum lever, 24...concave groove,
25... Third cam follower, 26... Means for rotating the fulcrum lever (fulcrum position adjustment bolt). Figure 4 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A cam lever whose upper end is connected to a driven member via a first cam follower and whose lower end is connected to a second cam follower that contacts the cam via a pivot shaft, a cam lever holder that movably holds the cam lever, and a cam lever. A variable stroke comprising: a cam follower receiver having a groove fixed to the cam follower receiver; a fulcrum lever having a third cam follower at one end that fits into the groove of the cam follower receiver; and means for rotating the fulcrum lever. Lever mechanism.